US20030019322A1 - Adjustable ramp helix - Google Patents
Adjustable ramp helix Download PDFInfo
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- US20030019322A1 US20030019322A1 US10/253,552 US25355202A US2003019322A1 US 20030019322 A1 US20030019322 A1 US 20030019322A1 US 25355202 A US25355202 A US 25355202A US 2003019322 A1 US2003019322 A1 US 2003019322A1
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- adjustable
- ramp
- collar
- throat
- ramps
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/04—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism
- F16H63/06—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions
- F16H63/067—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions mechanical actuating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/52—Pulleys or friction discs of adjustable construction
- F16H55/56—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
- F16H55/563—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable actuated by centrifugal masses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
- Y10T74/2102—Adjustable
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Operated Clutches (AREA)
- Catching Or Destruction (AREA)
Abstract
An adjustable ramp helix is disclosed for attachment to the clutch of a snowmobile or other vehicle. The adjustable ramp helix may include a base having a throat. Extending upwardly from the base opposite to the throat may be three equally sized ramp supports where each ramp support has an adjustable ramp. Each adjustable ramp is preferably pivotally attached to the top portion of a corresponding ramp support for positioning to the interior thereof. Each of the adjustable ramps includes an arcuate foot section which passes through an arcuate aperture in the base. A threaded outer dial collar may be rotatably engaged to the throat for positioning with respect to the collar. The collar engages the arcuate foot sections of the adjustable ramps to uniformly and simultaneously elevate the adjustable ramps above the ramp supports. The elevation of the adjustable ramps provides a new angle for the bushing faces for engagement to the clutch of a vehicle to establish an alternative speed of shifting for a snowmobile or other engine. An operator may thereby adjust the speed of shifting for a snowmobile or other vehicle without disassembly of the clutch and replacement of the helix during use in high altitude, varying snow, or changing temperature conditions.
Description
- Snowmobile clutch and transmission systems as known are not versatile to provide maximum performance in varying conditions as related to altitude, snow depth, and/or temperature. As such, optimal shifting performance for the snowmobile has not been obtained because snowmobile transmissions frequently shift gears early or late, thereby adversely affecting the performance of the sled.
- In the past, to attempt to minimize shifting problems a snowmobile operator purchased a number of helix devices, where each different helix device had inclined ramps of a desired set angle. The helix devices when engaged to a clutch, provided a desired speed of shifting of the gears of the snowmobile or other vehicle. These independent helix devices allowed an operator to disassemble the clutch to replace the helix for operation within varying altitude, snow, and temperature conditions, to attempt to maximize the performance of the snowmobile clutch and snowmobile.
- In the past, operators have frequently expended significant periods of time, which may have been in excess of one hour or more, in cold weather conditions, tearing down and reassembling a snowmobile clutch for replacement with a helix having a desired angle of incline for the stationary ramps in anticipation of future weather, temperature, and/or altitude conditions. Operators were thereby required to predict weather and snow conditions which frequently resulted in the failure to select the optimal helix for use in the anticipated conditions. In addition, changes in weather during a day often necessitated the changing of a helix to optimize sled or vehicle performance. Further, changes in altitude during a day or trip also necessitated a change or replacement of a helix to optimize snowmobile or vehicle performance.
- Significant time and expense is required to replace a helix for the clutch of a vehicle. It is also inconvenient to carry a number of helixes during a snowmobile trip for replacement to accommodate varying altitude, snow, and/or temperature conditions. A need therefore exists to provide an adjustable ramp helix which may be easily and conveniently modified to minimize maintenance and down time for a vehicle. Differing snow and temperature conditions also affect the transmission of a snowmobile as to how fast or how slow the shifting of the gears should occur. It is difficult to carry within a snowmobile glove box the tools and replacement helixes necessary to disassemble and replace the helix for a clutch during snowmobiling activities.
- This application is based upon and claims priority to co-pending U.S. Provisional Patent Application No. 60/122,520 filed Mar. 3, 1999, which is incorporated herein by reference.
- An adjustable ramp helix is disclosed for attachment to the clutch of a snowmobile or other vehicle. The adjustable ramp helix may include a base having a throat having threaded and non-threaded section's . Extending outwardly from the base opposite to the throat may be three equally sized ramp supports where each ramp support has an adjustable ramp. The adjustable ramps may be pivotally attached to the top portion of each of the ramp supports for positioning to the interior thereof. Each of the adjustable ramps preferably includes an arcuate foot section which passes through an arcuate aperture in the base. An elevator or outer dial collar may be rotatably engaged to the threaded section of the throat for positioning with respect to the base. The elevator or collar engages the arcuate foot sections of the adjustable ramps to uniformly and simultaneously elevate the adjustable ramps above the production ramp supports to provide a desired ramp angle for engagement to the vehicle clutch. A modified shift speed for the snowmobile or other engine is thereby provided. An operator may adjust the shift speed for a snowmobile or other vehicle without disassembly of the clutch and replacement of the helix during use in high altitude, varying snow, or changing temperature conditions. An operator may position the elevator or rotate the outer dial collar to elevate or lower the feet and adjustable ramps to alter the angle of incline for the adjustable ramps either upwardly or downwardly. This elevation or lowering of the angle of incline for the adjustable ramps alters the rate or speed at which the clutch shifts into a different gear during use of the snowmobile or vehicle.
- An advantage of the present invention is the provision of an adjustable ramp helix of relatively simple and inexpensive design, construction, and operation which provides adjustable shifting ratios without fear of injury to persons and/or damage to the transmission of a snowmobile.
- Another advantage of the present invention is the provision of an adjustable ramp helix which may be easily and conveniently manipulated to maximize performance of a snowmobile clutch within varying snow conditions.
- Still another advantage of the present invention is the provision of an adjustable ramp helix which may be easily and conveniently manipulated to maximize performance of a snowmobile clutch within varying temperature conditions.
- Still another advantage of the present invention is the provision of an adjustable ramp helix which may be easily and conveniently manipulated to maximize performance of a snowmobile clutch within varying altitude conditions.
- Still another advantage of the present invention is the provision of an adjustable ramp helix which minimizes maintenance or down time when an operator desires to modify the angle of incline for the adjustable ramps and thereby alter the speed of the shifting of the snowmobile transmission during use of a snowmobile.
- Still another advantage of the present invention is the provision of adjustable ramps which maximize enjoyment and minimizes frustration of a snowmobile operator during use of a snowmobile.
- Still another advantage of the present invention is the provision of adjustable ramps which provide a ramp incline angle of between 20° and 80° within a single helix.
- Still another advantage of the present invention is the provision of adjustable ramps which may accommodate uniformly horizontally arcuate ramps or variable inclined ramps at the discretion of an individual.
- Still another advantage of the present invention is the provision of adjustable ramps which permit the simultaneous selection of variable angles of incline for the adjustable ramps without the necessity to continuously replace the helix as used on a snowmobile.
- A feature of the present invention is the provision of an adjustable ramp helix having a base having a throat having threaded and non-threaded sections and an elevator or outer dial collar which permits an individual to easily select and simultaneously adjust the incline of the adjustable ramps of the helix as engaged to the clutch for shifting of the gears of a snowmobile.
- Another feature of the present invention is the provision of an adjustable ramp helix attached to the clutch of a snowmobile which eliminates the necessity to disassemble the clutch and replace the helix to alter the speed of shifting of the sled during use.
- Still another feature of the present invention is the provision of an adjustable ramp helix having three uniformly spaced and sized ramp supports where each ramp support includes a preselected stationary angle of incline which is identical to the initial angle of incline of the adjustable ramps.
- Still another feature of the present invention is the provision of an adjustable ramp helix having adjustable ramps pivotally attached to the top portion of each of the ramp supports.
- Still another feature of the present invention is the provision of an adjustable ramp helix having adjustable ramps positioned to the interior of the ramp supports.
- Still another feature of the present invention is the provision of adjustable ramps each having an arcuate foot section adapted for engagement to the elevator or outer dial collar for simultaneously altering the angle of incline of the adjustable ramps relative to the ramp supports during positioning of the elevator or rotation of the outer dial collar.
- Still another feature of the present invention is the provision of an adjustable ramp helix having a base having three uniformly spaced and sized arcuate shaped cutout apertures adapted to each receive an arcuate foot of a corresponding adjustable ramp.
- Still another feature of the present invention is the provision of an adjustable ramp helix where each arcuate foot has a bottom having a first flat surface, a second incline surface, and a transition point, where the arcuate foot is adapted to engage the elevator or outer dial collar during positioning of the elevator or rotation of the outer dial collar to adjust the angle of incline of the adjustable ramps relative to the ramp supports during use of a snowmobile.
- Still another feature of the present invention is the provision of an adjustable ramp helix where three adjustable ramps are simultaneously and uniformly elevated relative to the adjacent ramp supports for engagement to a clutch to establish a desired rate of shifting for a snowmobile without disassembly of the clutch and replacement of the helix during use in high altitude, varying snow, and/or changing temperature conditions.
- FIG. 1 is an environmental view of a snowmobile and clutch mechanisms;
- FIG. 2 is an exploded side view of the adjustable helix as engaged to the driven or secondary clutch;
- FIG. 3 is a top view of the adjustable helix taken along the line of3-3 of FIG. 2;
- FIG. 4 is a top view of the hub of the driven or secondary clutch taken along the line of4-4 of FIG. 2;
- FIG. 5 is a detailed side view of the adjustable helix as engaged to the driven or secondary clutch during operation of a snowmobile;
- FIG. 6 is an isometric detail view of the adjustable helix;
- FIG. 7 is a side view of the adjustable helix;
- FIG. 8 is a detailed cross-sectional side view of the adjustable helix taken along the line of8-8 of FIG. 3;
- FIG. 9 is an alternative embodiment of the adjustable helix as engaged to the driven or
secondary clutch 12; - FIG. 10 is a cross-sectional top view of the alternative adjustable helix taken along the line of10-10 of FIG. 9;
- FIG. 11 is an isometric view of an alternative embodiment of the adjustable helix;
- FIG. 11A is a detail view of an alternative embodiment of an adjustable ramp;
- FIG. 12A is a detailed side view of a variable adjustable ramp;
- FIG. 12B is an alternative detail side view of a variable adjustable ramp;
- FIG. 12C is an alternative detail side view of a variable adjustable ramp;
- FIG. 12D is an alternative detail side view of a variable adjustable ramp;
- FIG. 13 is an alternative side partial cutaway view of an adjustable helix;
- FIG. 14 is an alternative detail cross-sectional view of the collar and throat taken along the line of14-14 of FIG. 13;
- FIG. 15 is an alternative side view of the adjustable helix;
- FIG. 16 is an alternative detail cross-sectional view of the collar and throat taken along the line of16-16 of FIG. 15; and
- FIG. 17 is a detail cross-sectional side view of the aperture taken along the line of17-17 of FIG. 13.
- An adjustable ramp helix is illustrated and described herein. The adjustable ramp helix is generally referred to by the numeral10. As seen in FIG. 1, the
adjustable ramp helix 10 is preferably engaged to the driven orsecondary clutch 12 of asnowmobile 14. The driven or secondary clutch 12 preferably includes a pair ofsheaves 16 which are engaged to a V-belt 18. The V-belt 18 is further engaged to a front clutch 20 having a pair ofsheaves 22. Thesheaves 22 are preferably engaged to theengine 24 via a shaft not shown. - As may be seen in FIG. 1, the
adjustable helix 10 is preferably engaged to the exterior of the driven or secondary clutch 12 and is positioned below the clutch andbelt guard 26 of the snowmobile. An individual may therefore obtain access to theadjustable ramp helix 10 by lifting the clutch andbelt guard 26 as is apparent in FIG. 1. - As is seen in FIG. 1, when the
snowmobile 14 is in neutral, the V-belt 18 is positioned outwardly and is adjacent to the exterior circumference of thesheaves 16 of the driven orsecondary clutch 12. During operation of thesnowmobile 14, as power is applied to theengine 24, throw weights which are integral to the drive clutch 20 act to squeeze thesheaves 22 toward each other as depicted byarrows 28. The squeezing of thesheaves 22 of the drive clutch 20 in turn move the V-belt 18 outwardly toward the exterior circumference of thesheaves 22 of thedrive clutch 20. The movement of the V-belt 18 outwardly relative to thesheaves 22 in turn causes the V-belt 18 to be drawn inwardly relative to thesheaves 16 of the driven orsecondary clutch 12. Thesheaves 16 of the driven or secondary clutch 12 then separate as depicted byarrows 30. The separation of thesheaves 16 outwardly as identified byarrow 30 in turn causesbushings 32 to engage theadjustable ramps 70 to movebushings 32 upwardly along theadjustable ramps 70 to shift gears for the snowmobile 14 (FIGS. 1, 2, and 4). - The production incline for the helix assists in determining the speed of shifting for the
snowmobile engine 24. - The incline of the helix is important for the selection of the speed of shifting for the
snowmobile 14. An increase or decrease of the incline of the helix results in corresponding changes to the shift speed forsnowmobile 14. Generally, the incline for the helix varies at increments of 2°between 20° and 80° upwardly from horizontal. The incline of the helix determines how fast the transmission of thesnowmobile 14 shifts gears. At lower elevations or flatter terrains, steeper angles of incline are desired for the helix. At higher elevations or steeper terrains, lower angles of incline for the helix are preferred. In general, at a lower elevation of between 0 to 4,000 feet above sea level an incline for the helix of approximately 50° upwardly from horizontal is desired. At an elevation between 4,000 and 8,000 feet the preferred desired incline for the helix is approximately 47.5° upward from horizontal. At elevations between 8,000 to 12,000 feet the preferred angle of incline for the helix is approximately 450 upwardly from horizontal. It should be noted that the angles of incline described herein have been provided for illustrative purposes only and may vary considerably at the discretion of an individual. It should also be noted that the elevation above sea level is not the only factor for selection of an angle of incline for the helix. If a snowmobile is to be used in very hilly terrains, then an individual may desire that a lower angle of incline be provided for the helix. Also, it should be noted that the snow conditions and temperature also are factors to consider when selecting a desired angle of incline for a helix. - During use of the
snowmobile 14, thebushings 32 are continually riding upwardly and downwardly along the incline of theadjustable ramps 70 based upon the level of throttle selected by the snowmobile operator. During use of thesnowmobile 14 on steep hills, it is desirable that the angle of incline of theadjustable ramps 70 be relatively flat to facilitate slower shifting of the gears to avoid theengine 24 from becoming bogged down. An operator may thereby easily maintain a higher level of RPM for theengine 24. On more even terrain, it is desirable to have a relatively steep incline for theadjustable ramps 70 to facilitate a faster shifting of the transmission to maintain maximum performance and RPM's for thesnowmobile engine 24. - During use of a
snowmobile 14 in mountainous regions, the angle of incline for theadjustable ramps 70 is preferably higher at lower elevations where asnowmobile engine 24 typically has more power. At higher altitudes, asnowmobile engine 24 typically has 35% less horsepower; therefore, the angle of incline for theadjustable ramps 70 is required to be less steep to facilitate slower shifting of the transmission. If no change is made to the angle of incline for theadjustable ramps 70 between varying altitude conditions, the snowmobile transmission and driven or secondary clutch 12 will shift even if the power for theengine 24 is unavailable, resulting in the engine bogging down causing frustration to an operator. A steeper angle of incline for theadjustable ramps 70 typically results in faster shifting by the transmission which in turn increases the difficulty to hold a desired RPM for theengine 24, in turn increasing the possibility of thesnowmobile 14 becoming stuck in deep snow. The flatter or lower of the angle of incline for theadjustable ramps 70, the slower the transmission will shift up a gear and the faster the transmission will downshift. For running in deep snow, asnowmobile engine 24 frequently needs to quickly back shift; therefore, a flatter angle of incline for theadjustable ramps 70 is desired. The steeper the incline for theadjustable ramps 70, the faster thesnowmobile engine 24 shifts up a gear and the slower theengine 24 back shifts and vice versa. When operating in high altitude conditions, it is desirable to quickly downshift in order to maintain a desired level of RPM's for the engine. - In general, the driven or secondary clutch12 includes a
hub 36. Extending upwardly from thehub 36 are preferably three bushing chairs 38. Eachbushing chair 38 preferably includes abushing 32 which engages theadjustable ramps 70. The bushing chairs 38 are preferably uniformly spaced about the circumference of a circle within the interior of thehub 36. Thehub 36 surrounds theshaft 48 andspring 50 of the snowmobile 14 (FIGS. 2 and 4). - Three
clutch pillars 40 also preferably extend upwardly from thehub 36. Eachclutch pillar 40 preferably has a threadedpost 42 which is adapted to engage anut 44 which in turn is used to attach theadjustable helix 10 to thehub 36. Theclutch pillars 40 are preferably uniformly and regularly spaced about the circumference of thehub 36. - Three
spring retainers 46 are preferably regularly and uniformly spaced about thehub 36 exterior to theshaft 48. Each of thespring retainers 46 is preferably adapted to receive a first affixation tab of thespring 50 to prevent rotation of thespring 50 relative to thehub 36. Thespring 50 is preferably a torsion spring having any desired coil strength as preferred by an individual. Thespring 50 is preferably engaged to thehub 36 andadjustable ramp helix 10 to prevent snapping or slapping of thehelix 10 following shifting of the transmission for thesnowmobile 14. It should also be noted that thespring 50 preferably regulates the speed of shifting of the transmission of thesnowmobile 14 during use. The plurality ofspring retainers 46 within thehub 36 enable varying tensions to be selected for placement on thespring 50 during assembly and affixation of theadjustable ramp helix 10 to the driven orsecondary clutch 12. Generally, thespring 50 as engaged to thehub 36, is rotated and/or compressed one-third turn during affixation of the adjustable ramp helix 19 to theclutch pillars 40. - As seen in FIG. 2, the
adjustable ramp helix 10 is formed of abase 54. Extending outwardly from thebase 54 is preferably athroat 56 which is preferably adapted to receivingly engage an elevator orouter dial collar 58. Thethroat 56 may have a threadedsection 57. The elevator orouter dial collar 58 may completely or partially surround thethroat 56. The base 54 also preferably includes three regularly spaced and 20 equallysized affixation ledges 60. Adjacent eachaffixation ledge 60 is preferably a cut-away channel 62. Eachaffixation ledge 60 preferably includes anaperture 64 therethrough (FIGS. 3 and 6). Eachaffixation ledge 60, cut-away channel 62, andaperture 64 is preferably adapted to receivingly engage a threadedpost 42 for affixation of theadjustable helix 10 to the driven orsecondary clutch 12. - Each
affixation ledge 60 may also include apositioning wall 61 which is preferably adapted to be placed to the interior of, and adjacent to, the top of a correspondingclutch pillar 40 during engagement of theadjustable ramp helix 10 to the driven orsecondary clutch 12. The verticalrear edges 82 of the ramp supports 72 are preferably adapted for positioning adjacent to a correspondingvertical edge 84 of a correspondingclutch pillar 40. The cut-awaychannels 62 are also preferably sized to receivingly permit rotation of anut 44 during secure affixation of theadjustable helix 10 to the driven orsecondary clutch 12. - Extending outwardly from the threaded
section 57 of thethroat 56 is preferably anon-threaded surface 132. Thenon-threaded surface 132 is preferably utilized as an area to provide releasable affixation between theouter dial collar 58 and thethroat 56 following elevation or lowering of theadjustable ramps 70 to a desired angle relative to the ramp supports 72. The use of thenon-threaded surface 132 preferably minimizes risk of damage to the threadedsection 57 of thethroat 56 during affixation of theouter dial collar 58 at a desired rotational position relative to thethroat 56 during use of theadjustable helix 10. (FIGS. 15 and 16.) - The
non-threaded surface 132 may include a plurality of regularly spaced recessedgrooves 134. The recessedgrooves 134 may be regularly spaced along thenon-threaded surface 132 to provide for elevation and/or lowering of the angle of incline of theadjustable ramps 70 relative to the ramp supports 72 at any increment as desired by an individual. It is anticipated that the desired spacing of the recessedgrooves 134 about thenon-threaded surface 132 provides elevation and/or decent of theadjustable ramps 70 at 2° increments relative to the ramp supports 72. Alternatively, thenon-threaded surface 132 may contain a plurality of retaining recesses. The retaining recesses, like the longitudinally extending recessedgrooves 134 are preferably adapted to receive apositioner 165 which is used to secure theouter dial collar 58 at a desired rotational position relative to thethroat 56. The retaining recesses are also preferably regularly spaced along thenon-threaded surface 132 to provide for elevation and/or lowering of the angle of incline for theadjustable ramps 70 relative to the ramp supports 72 at any increment as desired by an individual. It is anticipated that the spacing of the retaining recesses about thenon-threaded surface 132 provides for elevation and/or decent of theadjustable ramps 70 at 2° increments relative to the ramp supports 72. - The retaining recesses or recessed
grooves 134 may be regularly spaced along the exterior of thenon-threaded surface 56 in any desired pattern and/or configuration as desired by an individual. It should be noted that the retaining recesses may be configured in an arcuate shape and/or spiral along thenon-threaded surface 132. It should also be noted that a plurality of patterns may be provided for the retaining recesses and/or recessedgrooves 134 about thenon-threaded surface 132 as desired by an individual. An individual may simultaneously use recessedgrooves 134 and/or retaining recesses without sacrificing the essential functions, features, and attributes described herein. - In an alternative embodiment, the
non-threaded surface 132 may not include recessedgrooves 134 and/or retaining recesses. In this embodiment, thenon-threaded surface 132 is adapted to receive thepositioner 165 through the use of compression which in turn may secure theouter dial collar 58 at a desired rotational position relative to thethroat 56. In this embodiment thepositioner 165 may be a screw having a nylon end which may be utilized to releasably secure theouter dial collar 58 at a desired rotational location relative to thethroat 56, which in turn releasably secures theadjustable ramps 70 at a desired angle of incline relative to the ramp supports 72. - It is anticipated that the
throat 56 will include an outwardly extendingnon-threaded surface 132 which may be utilized for engagement to thepositioner 165. Alternatively, thenon-threaded surface 132 may be eliminated from thethroat 56 as described herein. - The
outer dial collar 58 may include aninterior surface 174. In one embodiment a plurality ofapertures 176 may traverse theouter dial collar 58. The plurality ofapertures 176 are preferably adapted to each receive apositioner 165 utilized to secure theouter dial collar 58 at a desired rotational position relative to thethroat 56. Theapertures 176 may be further adapted to include adetente recess 168 proximate to theinterior surface 174. Theapertures 176 andpositioners 165 may be regularly spaced about theouter dial collar 58 to facilitate releasable engagement to thethroat 56. - The
positioners 165 may includedetente balls 166, pins, or setscrews 122, at the preference of an individual. Alternative devices may be used as thepositioners 165 described herein provided that the essential functions, features, and attributes for theadjustable helix 10 are not sacrificed. - Positioners165 such as
set screws 122 may traverse the exterior surface of theouter dial collar 58. Interior to theapertures 176 may also be positioned aspring 170 which may further engage adetente ball 166 and/or pin. The rotation of thepositioner 165, or setscrew 122 preferably compresses thespring 170 which, in turn, tightens the contact between thedetente ball 166 and/or pin to thenon-threaded surface 132. Thepositioner 165, or setscrew 122 should not be tightened to restrict rotation of theouter dial collar 58 relative to thethroat 56 until such time as thedetente balls 166 and/or pins are aligned with the recessedgrooves 134 and/or retaining recesses. Following mating engagement of thedetente balls 166 within the recessedgrooves 134 or the insertion of the pins within the retaining recesses, thepositioner 165, or setscrew 122, may be further tightened to prevent inadvertent and/or undesirable rotation of theouter dial collar 58 relative to thethroat 56. To effectuate rotation of theouter dial collar 58 relative to thethroat 56 an individual may manipulate and release thepositioner 165 and/or setscrew 122 to remove tension from thecompressed spring 170. The reduction of tension upon thespring 170 permits thedetente balls 166 and/or pins to separate from the recessedgrooves 134 and/or retaining recesses permitting rotation of theouter dial collar 58 relative to thethroat 56. - It should be noted that the use of
detente balls 166 and/or pins may be eliminated provided that thepositioner 165 and/or setscrew 122 is of sufficient length for engagement to thethroat 56 and preferably to thenon-threaded surface 132. Alternatively, the distal end of thepositioner 165 and/or setscrew 122 may include a nylon engagement edge which may frictionally bind thenon-threaded surface 132 restricting rotation of theouter dial collar 58 relative to thethroat 56. As noted above, theapertures 176 may be threaded to receive a threadedpositioner 165 permitting rotation therebetween. In this embodiment thepositioner 165 or setscrew 122 may have an elevated position which permits rotation of theouter dial collar 58 relative to thethroat 56 to an engaged position which secures theouter dial collar 58 to thethroat 56. - It should be noted that the use of a
set screw 122 and/or other tightening device may be eliminated at the discretion of an individual. In this embodiment, theouter dial collar 58 may include a plurality of regularly spaced detente and/or pin recesses 168. A cavity may be integral to the base 54 to hold aspring 170 and adetente ball 166. Thedetente ball 166 and/or pin may be engaged to the distal end of thespring 170 for compression relative to thenon-threaded surface 132. The compression of thespring 170 is preferably of a sufficient force to urge thedetente balls 166 and/or pins outwardly for engagement within the pin recesses 168 to secure theouter dial collar 58 to thethroat 56. - Any desired affixation member may be utilized by an individual provided that the releasable rotation of the
outer dial collar 58 relative to thethroat 56 is provided herein. - The
positioner 165 and/or setscrews 122 may traverse the outer surface of theouter dial collar 58 to facilitate access by an individual to permit rotation of theouter dial collar 58 relative to thethroat 56. - The regularly spaced recessed
grooves 134 may also be adapted to receive thedetente balls 166. Aspring 170 may be positioned proximate to each of thedetente balls 166. Thesprings 170 preferably engage thedetente balls 166 to urge thedetente balls 166 outwardly into the regularly spaced recessedgrooves 134 to releasably secure theouter dial collar 58 at a desired rotational position relative to the threadedthroat 56. During rotation of theouter dial collar 58 relative to thethroat 56 it is anticipated that thesprings 170 will expand urging thedetente balls 166 outwardly to ride upon thenon-threaded surface 132 until such time as positioning within another recessedgroove 134 becomes available. - The retaining recesses may be adapted to receive pins which are engaged to the
outer dial collar 58. The pins are preferably positioned proximate to theinterior surface 174 of theouter dial collar 58. The pins may also be engaged tosprings 170 which may be utilized to urge the pins outwardly to engage thenon-threaded surface 132 until such time as alignment with the retaining recesses becomes available for releasable positioning of theouter dial collar 58 at a desired rotational position relative to thethroat 56. - The
outer dial collar 58 preferably includes an outer circumference which may have recessedportions 178 which may be utilized by an individual to facilitate grasping for rotation of theouter dial collar 58 relative to thethroat 56. Alternatively, the exterior surface of theouter dial collar 58 may includeknurled sections 180 to facilitate grasping by an individual for rotation of theouter dial collar 58 relative to thethroat 56. - Extending outwardly from the base54 opposite to the
throat 56 are preferably three uniformly shaped and regularly spaced ramp supports 72. Each of the ramp supports 72 include anaperture 68 therethrough adjacent to the top. Anadjustable ramp 70 is preferably pivotally engaged to each of the ramp supports 72. - A transition member73 may be positioned between each adjustable ramps 70 and the
outer dial collar 58. The transition member 73 may be afoot 74 or aelevator pin 164. The transition member 73 preferably provides the mechanism for elevation of theadjustable ramps 70 relative to the ramp supports 72 during use of theadjustable ramp helix 10. - Each
adjustable ramp 70 may include afoot 74 having a firstflat surface 76, a secondinclined surface 78, and atransition point 80 between the firstflat surface 76 and the secondinclined surface 78. - The
adjustable ramps 70 are preferably pivotally engaged to acorresponding ramp support 72 via a nut and bolt, pin, or set screw which is positioned within anaperture 68. Abushing 182 is preferably positioned within theapertures 68 to facilitate pivotal interaction between theadjustable ramps 70 and the ramp supports 72. Thebushings 182 may be formed of any material as desired by an individual including, but not limited to, Teflon and/or plastics to reduce friction between the nut, pin, or set screw and theaperture 68. Theadjustable ramp helix 10 preferably includes three identically sized, spaced and shaped ramp supports 72 havingadjustable ramps 70 positioned about the circumference of theadjustable ramp helix 10. - Referring to FIGS. 3, 5,6, and 7, the
base 54 of the adjustable ramp helix preferably includes three identically shaped, sized, and regularly spaced arcuate or kidney shapedapertures 86 which are oversized relative to thefeet 74 of theadjustable ramps 70. Each arcuate or kidney shapedaperture 86 is preferably adapted to receive acorresponding foot 74 of aramp support 70. Thebase 54 of theadjustable ramp helix 10 also preferably includes a plurality ofspring retainers 88 which are adapted to engage second tabs of thespring 50. The top view of theadjustable ramp helix 10 shows that eachramp support 72 preferably includes atop shelf 92 and theaperture 68 which is adapted to receive a nut and bolt, pin, or setscrew 94 to pivotally affix theadjustable ramps 70 to the ramp supports 72. (FIGS. 3 and 6.) - As may be seen in FIG. 3, each
ramp support 72 includes anadjustable ramp 70. Eachramp support 72 preferably has anarcuate exterior edge 96 and a substantially straightinterior edge 98 as may be seen in FIG. 6. Eachramp support 72 also preferably has abushing face 184 which is preferably arcuate laterally or curved inwardly. Eachramp support 72 is also simultaneously arcuate vertically, descending inwardly and downwardly over a curve having a preselected shape from thetop shelf 92 to thebase 54. As may be further seen from FIG. 6, the ramp supports 72 have their widest width dimension proximate to thetop shelf 92 and the smallest width dimension proximate to thebase 54. The shape selected for theadjustable ramps 70 and/or ramp supports 72, may have any rotational, twisting, and/or spiral incline as desired. The angle of incline for theadjustable ramps 70 and/or ramp supports 72 may vary between the base 54 and the portion of theramp support 72 proximate to thetop shelf 92. As such, the angle of incline for theadjustable ramps 70 and/or ramp supports 72 may be consistently uniform, regularly curved, or variable at the discretion of an individual. (FIGS. 7, 6, 12A-12D.) - In an alternative embodiment, the
adjustable ramps 70 and/or ramp supports 72 may have a relatively smaller incremental increase or decrease in the angle of incline adjacent to thebase 54. Also, theadjustable ramps 70 and/or ramp supports 72 may have a larger or steeper incremental increase or decrease in the angle of incline adjacent to thetop shelves 92. The variable angle of incline of theadjustable ramps 70 and/or ramp supports 72 is preferably in addition to the arcuate interior curve for the shape of eachadjustable ramp 70 and/orramp support 72. - The straight
interior edges 98 of the ramp supports 72 preferably represent a vertical wall which is perpendicular to thebase 54. The vertical wall of the ramp supports 72 are preferably of sufficient strength to counter the outward centrifugal forces of theadjustable ramps 70 during rotation of the driven orsecondary clutch 12. The vertical wall preferably supports theadjacent wall 100 to prevent or prohibit outward movement of theadjustable ramps 70 relative to the ramp supports 72 due to centrifugal forces which are exposed to theadjustable helix 10 during rotation of the driven or secondary clutch 12 during use of asnowmobile 14. - The
adjustable ramps 70 preferably include a straight adjacent wall or edge 100 which is another substantially vertical wall positioned adjacent to the straightinterior edge 98 of acorresponding ramp support 72. As may be seen in FIGS. 6 and 7, the straightinterior edge 98 and the straight adjacent wall or edge 100 are not arcuate laterally to coincide with the arcuate shape of the combined ramp supports 72 andadjustable ramps 70. The straightinterior edge 98 and the straight adjacent wall or edge 100 preferably traverses the overall arcuate shape of the ramp supports 72 along a straight line. The straightinterior edge 98 and straight adjacent wall or edge 100 preferably initiate proximate to thetop shelf 92 of the ramp supports 72 and thetop shelf 102 of theadjustable ramps 70 extending downwardly in a straight line crossing the arcuate shape of the ramp supports 72 toward thebase 54. The straightinterior edge 98 and the straight adjacent wall or edge 100 preferably terminate proximate to the base 54 defining theleading edge 106 and thehorizontal shelf 120. Thehorizontal shelves 120 are the underside of theadjustable ramps 70 which are adapted for flush engagement to thebase 54, or for elevation with respect thereto, via the rotatable inward positioning of theouter dial collar 58 which in turn elevates thefeet 74 and theadjustable ramps 70 above the ramp supports 72. Theadjustable ramps 70 also preferably include atop shelf 102, aforward tang 104, and aleading edge 106. Theadjustable ramps 70 also preferably include a reararcuate edge 108. The reararcuate edge 108 is preferably adapted for positioning adjacent to therear edge 110 of the arcuate or kidney-shapedapertures 86 when theadjustable ramps 70 are in flush alignment with the ramp supports 72 defining a first position. In this first position, eachadjustable ramp 70 has the identical shape of thecorresponding ramp support 72 representing a smooth transition therebetween (FIG. 6). In this first position, theforward tang 104 is preferably positioned adjacent to and in contact with theinterior edge 112 of the arcuate or kidney-shapedapertures 86. It should be noted that the arcuate or kidney-shapedapertures 86 are preferably oversized relative to thefeet 74 of theadjustable ramps 70. - Each of the
adjustable ramps 70 preferably has asecond bushing face 186. (FIGS. 6 and 7). Thesecond bushing face 186 is also arcuate laterally and is simultaneously arcuate vertically, descending inwardly and downwardly having a pre-selected shape from thetop shelf 102 to theleading edge 106. Theadjustable ramps 70 have their narrowest width dimension proximate to thetop shelf 102 and the largest width dimension proximate to theleading edge 106. The shape selected for theadjustable ramps 70 and second bushing faces 186 may have any rotational, curved, twisting, and/or spiral incline as desired for flush alignment with thefirst bushing face 184 when in the first position. The angle of incline for theadjustable ramps 70 may also vary between the portion of theadjustable ramps 70 adjacent to theleading edge 106 and the portion of theadjustable ramps 70 proximate to thetop shelf 102. The angle of incline for theadjustable ramps 70 may also be consistently uniform, regularly curved, or variable at the discretion of an individual. (FIGS. 6, 7, 12A-12D). Theadjustable ramps 70 may further have a relatively smaller incremental increase or decrease in the angle of incline adjacent to theleading edge 106. Also, theadjustable ramps 70 may have a larger or steeper incremental increase or decrease in the angle of incline adjacent to thetop shelf 102. The variable angle of incline for theadjustable ramps 70 are preferably in addition to the arcuate interior curve for the shape of eachadjustable ramp 70 andsecond bushing face 186. - As depicted in FIGS. 5 and 7, and as shown in phantom line in FIG. 3, as the
outer dial collar 58 is rotated inwardly toward thebase 54, the contact between theouter dial collar 58 and thefeet 74 initiates the elevation of theadjustable ramps 70 relative to the ramp supports 72. As rotation of theouter dial collar 58 continues additional upward elevation of theadjustable ramps 70 occurs. During elevation; thefeet 74 of theadjustable ramps 70 move forwardly and inwardly as represented byarrow 114 of FIG. 3 within thearcuate apertures 86. When theouter dial collar 58 is fully engaged for positioning adjacent to thebase 54, theadjustable ramps 70 and are moved to a second fully engaged position where the second busing faces 186 are elevated to a maximum point relative to first bushing faces 184. In this second fully engaged position, theforward tangs 104 are positioned adjacent to theexterior edges 116 of the arcuate or kidney-shapedapertures 86. It should be noted that theforward tangs 104 in the second fully engaged position are also preferably adjacent to the frontarcuate edges 118 of the arcuate or kidney-shapedapertures 86. The elevation of the second bushing faces 186 relative to the first bushing faces 184 is illustrated in FIG. 7. It should be noted that the rotation of theouter dial collar 58 preferably simultaneously and uniformly moves all of theadjustable ramps 70 forwardly and upwardly with respect to thefirst bushing surface 184 of the ramp supports 72. In this second fully engaged position, a less steep angle of incline is provided for theadjustable ramps 70 relative to the ramp supports 72. - The
feet 74 of theadjustable ramps 70 are preferably also arcuate or kidney-shaped for positioning within the arcuate or kidney-shapedapertures 86. The rotation of theouter dial collar 58 toward thebase 54 elevates theforward tangs 104 within the arcuate or kidney-shapedapertures 86. - Referring to FIG. 2, as the
outer dial collar 58 is rotated inwardly about thethroat 56, the leading surface of theouter dial collar 58 engages the firstflat surfaces 76 of thefeet 74. As further inward rotation of theouter dial collar 58 occurs, thefeet 74 of theadjustable ramps 70 elevate. The contact between thefeet 74 andouter dial collar 58 then progresses toward thetransition point 80 as further rotation of theouter dial collar 58 occurs. Proximate to thetransition point 80, theadjustable ramps 70 are being elevated with respect to the ramp supports 72. As further rotation of theouter dial collar 58 occurs, thefeet 74 are elevated beyond thetransition point 80 onto the secondinclined surface 78. At such time as theouter dial collar 58 is completely rotated to elevate thefeet 74 andadjustable ramps 70 to the maximum level, the secondinclined surfaces 78 will preferably be in flush contact with theouter dial collar 58. - It should be noted that inward rotation of
outer dial collar 58 causes all of thefeet 74 to elevate simultaneously and equally. Therefore, all of the inclines for theadjustable ramps 70 are identical and are elevated or lowered by a corresponding uniform amount. - Each of the
adjustable ramps 70 preferably include a substantially triangular shapedhorizontal shelf 120 which is preferably positioned exterior to theforward tangs 104 underneath the leadingedges 106. The triangular shapedhorizontal shelves 120 flushly engage the base 54 which function as a stop to align theadjustable ramps 70 to the ramp supports 72 when theadjustable ramps 70 are in the first non-elevated position. - As depicted in FIG. 7, the
outer dial collar 58 is preferably rotated for elevation of theadjustable ramps 70 to the second fully elevated position where theouter dial collar 58 is engaged to the secondinclined surfaces 78 of thefeet 74. Theouter dial collar 58 may be rotated for elevation of theadjustable ramps 70 to any desired position between the first lowered position and the second fully engaged position as desired by an individual. An infinite variety of positions is available for elevation of theadjustable ramps 70 above the ramp supports 72 as desired by an individual. - Referring to FIGS. 3 and 6, the
top shelves 102 of theadjustable ramps 70 andtop shelves 92 of the ramp supports 72 each include alignedapertures 68 therethrough. Preferably a nut and bolt, pin, or screw 94 pivotally attaches theadjustable ramps 70 to the ramp supports 72 proximate to thetop shelves apertures 68 through each of thetop shelves bushing 182 to reduce friction between the pin or screw 94 and theapertures 68. - Referring to FIG. 8, the ramp supports72 and
outer dial collar 58 are depicted in cross section. The ramp supports 72 are shown to be in flush contact with theadjustable ramps 70. As is apparent in FIG. 8, the straightinterior edge 98 of eachhelix ramp 72 is in flush engagement to the straight adjacent wall and edge 100 of an adjacentadjustable ramp 70. The oversizing of the arcuate or kidney-shapedapertures 86 is apparent relative to thefeet 74 of theadjustable ramps 70. Theouter dial collar 58 is shown to be threadably engaged to thethroat 56. Theouter dial collar 58 may be secured in a desired location relative to thethroat 56 by the tightening of aset screw 122. It should be noted that theset screw 122 is preferably engaged to thenon-threaded surface 132. However, theset screw 122 may be engaged to the threadedportion 57 of thethroat 56 when a nylon or rubber insert is utilized to avoid causing damage to thethreads 57 of thethroat 56. Alternatively, theset screw 122 may be adapted for tightening engagement to thethroat 56 at a location where threads are absent. Thebase 54 of theadjustable ramp helix 10 also preferably includes acentral collar 124 defining anopening 126 adapted to receive a shaft (not shown). - Referring to FIG. 6, it should be noted that the
inner walls 128 of theadjustable ramps 70 are preferably arcuate and are substantially parallel to the arcuate exterior edges 96 of the ramp supports 72. - Referring to FIG. 5, the driven or secondary clutch12 is depicted during an open throttle condition where the
sheaves 16 have been moved outwardly according toarrow 30. During open throttle conditions, thespring 50 is compressed due to the outward movement of thesheaves 16 in response to the drawing of the V-belt 18 toward the center of thesheaves 16. In this instance, thebushings 32 are moved outwardly and upwardly along theadjustable ramps 70 to facilitate shifting of the transmission of thesnowmobile 14. Theouter dial collar 58 in this figure is shown to be in engagement with thefeet 74 of theadjustable ramps 70. Also shown in FIG. 5 is the affixation of theadjustable ramp helix 10 to the driven or secondary clutch 12 via the engagement of the nuts 44 to the threaded posts 42. - In an alternative embodiment the
adjustable ramp helix 10 may be engaged to the opposite or internal side of the driven orsecondary clutch 12. One embodiment showing engagement to the clutch 12 proximate to theengine 24 is depicted in FIGS. 9 and 11. In this embodiment, theadjustable ramp helix 10 is positioned interior to the driven or secondary clutch 12 adjacent or proximate to theengine 24 below the clutch andbelt guard 26 of thesnowmobile 14. Theadjustable ramp helix 10 may be engaged to the driven or secondary clutch 12 proximate to or away from theengine 24 depending on the make of vehicle and type ofclutch 12 utilized. - As depicted in FIG. 11, the
base 140 includes three regularly spaced, sized, and ramp supports 72. Eachramp support 72 preferably includes atop shelf 144 and anaperture 146 to facilitate pivotal affixation of anadjustable ramp 148 thereto. Eachaperture 146 is preferably adapted to hold abushing 182 and a nut and bolt, set screw and/or pin connector as earlier described. The base 140 preferably includes acentral collar 150. Eachramp support 72 preferably includes a substantiallyvertical channel 152 which is adapted to receive a substantiallyvertical tongue 154 which is integral to eachadjustable ramp 148. Theadjustable ramps 148 preferably include abushing face 156 which is substantially T-shaped relative to thevertical tongue 154. - In this embodiment, the ramp supports72 include an arcuate
exterior wall 158. Eachramp support 72 is adapted to receive thetongue 154 of an adjacentadjustable ramp 148. - In this embodiment, three
elevator apertures 162 vertically traverses thebase 140. Thevertical elevator apertures 162 are preferably adapted to each receive anelevator pin 164. The elevator pins 164 preferably extend below thebase 140 and are adapted for engagement to an elevator orouter dial collar 58. Elevation of the elevator, or rotation of theouter dial collar 58, engages the elevator pins 164 to urge the elevator pins 164 upwardly for engagement to arespective tongue 154 to elevate theadjustable ramps 148 relative to the ramp supports 72. - Referring to FIG. 9, the alternative
adjustable ramp helix 10 is shown engaged to the driven orsecondary clutch 12. The alternativeadjustable ramp helix 10 is shown to surround ashaft 130. Theadjustable ramp helix 10 includes athroat 56 and anouter dial collar 58 as earlier described. Thethroat 56 may include annon-threaded surface 132 as earlier described. Theouter dial collar 58 preferably raises or lowers the elevator pins 164 to either raise or lower the bushing faces 156 to desired angle of incline to assist the transmission of asnowmobile 14 during shifting. Referring to FIG. 9, as the V-belt 18 is drawn downwardly, thesheaves 16 separate, which in turn results in thebushings 32 ascending upwardly along arespective bushing face 156. It should be noted that thebushings 32 do not engage or ride upon the ramp supports 72 even when theadjustable ramps 70 are at the lowest first position. Thebushings 32 preferably engage theadjustable ramps 70 during use of theadjustable helix 10. The angle of incline selected for the bushing faces 156 determines the speed of shifting for the transmission of thesnowmobile 14. - Referring back to FIG. 11, it should be noted that the relationship between the
vertical tongues 154 and thebushing face 156 may be substantially an inverted L-shape as opposed to a T-shape at the discretion of an individual without affecting the essential functions, features, and attributes described herein. - Referring to FIG. 10, the
vertical channels 152 are preferably oversized with respect to thevertical tongues 154 to permit the pivotal elevation of thevertical tongues 154 relative to the ramp supports 72 via a nut and bolt, pin or set screw as positioned within theapertures 146. Eachvertical tongue 154 may include anangled base portion 166 to facilitate engagement interior to a respective ramp support 142 as adjacent to the arcuateexterior wall 158. - Referring to FIGS. 9, 10, and11, as the
outer dial collar 58 is rotated inwardly about thethroat 56, the leading surface of theouter dial collar 58 engages the elevator pins 164. As further rotation of theouter dial collar 58 occurs, the elevator pins 164 elevate for contact with either the T-supports 163 orvertical tongues 154. The contact between the elevator pins 164 and theouter dial collar 58 in turn elevates theadjustable ramps 148 and bushing faces 156 upwardly relative to the ramp supports 72. As further rotation of theouter dial collar 58 occurs, the elevator pins 164 continue to progress upwardly. At such time as theouter dial collar 58 is completely rotated to elevate the elevator pins 164 to the maximum level, theadjustable ramps 148 and bushing faces 156 will be positioned to establish the lowest angle of incline available to a user for shifting of a snowmobile transmission. - As depicted in FIGS.12A-12D, the angle of incline for the ramp supports 72,
adjustable ramps 70, or bushing faces 156 may be variable at the discretion of an individual. A variable ramp is one which does not include a uniform or arcuate transition between a top portion proximate to the top shelf and the base. As depicted in FIG. 12B, a variable ramp would include a first flat or angled portion proximate to a base and a second steeper angled portion proximate to a top shelf. - In an alternative embodiment, the
elevator 58 may individually raise or lower theadjustable ramps 70 consecutively to an equal desired angle of incline relative to thebushings 32. In this embodiment theelevator 58 is not required to simultaneously raise all theadjustable ramps 70. However, it should be noted that theelevator 58 is required to raise all of theadjustable ramps 70 to an exact level to avoid uneven wear on thebushings 32 and clutch 12. In this embodiment the transition members 73 may be either afoot 74 or anelevator pin 164 as preferred by an individual. - The
elevator 58 may be used to either raise or lower theadjustable ramps 70 relative to the ramp supports 72. In an alternative embodiment, theadjustable ramps 70 may be initially set in the second, most elevated position, where theelevator 58 may be manipulated to lower theadjustable ramps 70 to provide a desired angle of incline. In this embodiment a return, spring, or actuating member may be provided to automatically position theadjustable ramps 70 to the second elevated position upon the release of theelevator 58. In an alternative embodiment, a return, spring, and/or actuating member may be utilized to automatically position theadjustable ramps 70 to the lowered first position upon the release of theelevator 58. In another alternative embodiment theelevator 58 may be required to be manipulated to either raise or to lower theadjustable ramps 70 to an angle of incline as preferred by an individual. - An alternative embodiment is depicted in FIGS. 13 and 14. In this embodiment, the
adjustable ramps 202 are pivotally engaged to the ramp supports 204 which extend outwardly from the base 200. The base 200 includes acentral throat 206 which may be adapted to surround a shaft of thesnowmobile 14. The exterior surface of thecentral throat 206 may either be threaded or non-threaded at the preference of an individual. - A plurality of
first pins 208 preferably function as the transition members 73 passing throughapertures 86 traversing the base 200. The first pins 208 are preferably positioned between theadjustable ramps 202 and theelevator platform 210. - The base200 has an
exterior wall 212 defining an internal cavity 214. The interior of the cavity 214 is preferably threaded as identified by numeral 216. Theelevator platform 210 preferably has a central opening for surrounding the shaft orcentral throat 206. Theelevator platform 210 has a distal circumferential end 218 which is preferably threaded and is adapted to rotatably engage the threaded cavity 216. Theelevator platform 210 is preferably adapted to be freely rotatable within the interior of the cavity 214. Theelevator platform 210 also preferably includes a plurality ofholes 220 therethrough. Theelevator platform 210 has afirst engagement surface 222 which is preferably adapted for contact with thefirst pins 208 which in turn are used to elevate theadjustable ramps 202 with respect to the ramp supports 204. Thefirst engagement surface 222 is preferably smooth and may be coated with a friction reducing material to facilitate the circular or arcuate contact with thefirst pins 208 during rotation of theelevator platform 210. - An
outer collar 224 is preferably rotatably engaged to the exterior of thewall 212. Theouter collar 224 preferably has a plurality of securely affixedrotational pins 226 extending inwardly into the cavity 214. Each of therotational pins 226 is preferably adapted for positioning through one of theholes 220. Rotation of theouter collar 224 thereby transfers rotational motion from theouter collar 224 to theelevator platform 210 through the rotational pins 226. Therotational pins 226 preferably slide through theholes 220 which may be coated with a friction reducing material at the preference of an individual. The rotation of theelevator platform 210 in turn causes thefirst pins 208 to elevate or lower theadjustable ramps 202. The exterior surface of theouter collar 224 may be knurled 180 at the preference of an individual to facilitate grasping and manipulation thereof. Theouter collar 224 may be rotatably engaged to theexterior wall 212 through the use of a rail and pin 228 which may include ball bearings to facilitate positioning of theouter collar 224 relative to the base 200. - The
exterior wall 212 may include apositioning cavity 230 adapted to hold aspring 232 anddetente ball 234. The interior of theouter collar 224 may also include atrack 236 having a plurality of positioning recesses 168 as depicted in FIG. 14. - A
travel limiter 238 may traverse theouter collar 224 for engagement to theexterior wall 212 to restrict rotation of theouter collar 224 relative to theexterior wall 212 at the discretion of an individual. - The
spring 232 anddetente ball 234 are preferably adapted for adjustable positioning within thetrack 236. Thedetente ball 234 is preferably seated within one of the plurality of positioning recesses 168 to assist in the retention of theouter collar 224 in a desired position relative to the base 200 to provide a desired level of elevation or incline for theadjustable ramps 202. The first pins 208 freely slide upon thefirst engagement surface 222 in a circular configuration when viewed from above. Therotational pins 226 freely slide within theholes 220 to permit movement of theelevator platform 210 inwardly toward or outwardly away from theadjustable ramps 202. The first pins 208 and therotational pins 226 are preferably offset with respect to each other to avoid contact, which could interfere with the free rotation of theelevator platform 210 within the cavity 214. - The
adjustable ramp helix 10 may also be either electronically and/or hydraulically coupled to a power source such as a motor or pump to engage theelevator 58 to eliminate the necessity for manual manipulation. In this embodiment, the vehicle may include a switch adjacent to a handlebar and/or steering column which may be activated by an individual. The engagement of the switch in turn preferably provides a signal to the motor or pump to initiate movement of theelevator 58 for elevation or lowering of theadjustable ramps 70. - A vehicle may further include a temperature censor and/or altimeter, or the vehicle may include an input device where an individual may enter data such as altitude, temperature, and/or snow or environmental conditions. The censors and/or input device may be in communication with a microprocessor which in turn may process the data and automatically communicate a signal to the motor or pump to elevate or lower the
elevator 58 to an optimal angle of incline for theadjustable ramps 70. - It should be further noted that the use of an
adjustable ramp helix 10 as described herein may be adapted for use with four-wheel all-terrain vehicles, watercraft, or automobiles via the use of hydraulic assists and servo motors as connected to a controller and computer to sense environmental conditions for signaling of required transmission adjustments to manipulate theadjustable ramp helix 10. - The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof; and it is, therefore, desired that the present embodiment be considered in all respects as illustrative and not restrictive, reference being made to the appended claims rather than to the foregoing description to indicate the scope of the invention.
Claims (20)
1. An adjustable ramp helix comprising:
a. a base having a plurality of vertically adjustable ramps; and
b. an elevator operatively connected to said adjustable ramps, whereby said elevator simultaneously alters the elevation of said adjustable ramps relative to said base.
2. The adjustable ramp helix according to claim 1 , said base further comprising a plurality of apertures.
3. The adjustable ramp helix according to claim 2 , further comprising a transition member positioned between the elevator and the adjustable ramps, wherein movement of said elevator toward said base elevates said adjustable ramps.
4. The adjustable ramp helix according to claim 2 , further comprising a transition member positioned between the elevator and the adjustable ramps, wherein movement of said elevator away from said base lowers said adjustable ramps.
5. The adjustable ramp helix according to claim 3 , said transition member comprising: a foot engaged to each of said adjustable ramps, each of said feet adapted for positioning within one of said apertures.
6. The adjustable ramp helix according to claim 3 , said transition member comprising an elevator pin positioned within each of said apertures.
7. The adjustable ramp helix according to claim 5 , said base further comprising a throat.
8. The adjustable ramp helix according to claim 7 , said elevator comprising a collar at least partially surrounding said throat, said collar moveable relative to said throat whereby positioning of said collar elevates said adjustable ramps relative to said base.
9. The adjustable ramp helix according to claim 7 , said elevator comprising a collar at least partially surrounding said throat, said collar moveable relative to said throat whereby positioning of said collar lowers said adjustable ramps relative to said base.
10. The adjustable ramp helix according to claim 8 , said base further comprising:
a plurality of ramp supports, wherein each adjustable ramp is engaged to one of said ramp supports.
11. The adjustable ramp helix according to claim 10 , wherein said adjustable ramps are pivotally engaged to said ramp supports.
12. The adjustable ramp helix according to claim 8 , said throat comprising a threaded section, said collar rotatably engaged to said threaded section wherein rotation of said collar toward said base elevates said adjustable ramps.
13. The adjustable ramp support according to claim 8 , said throat comprising a threaded section, said collar rotatably engaged to said threaded section wherein rotation of said collar away from said base lowers said adjustable ramps.
14. The adjustable ramp helix according to claim 6 , said base further comprising a throat.
15. The adjustable ramp helix according to claim 14 , said elevator comprising a collar at least partially surrounding said throat, said collar moveable relative to said throat whereby movement of said collar elevates said adjustable ramps.
16. The adjustable ramp helix according to claim 14 , said elevator comprising a collar at least partially surrounding said throat, said collar moveable relative to said throat whereby movement of said collar lowers said adjustable ramps.
17. The adjustable ramp helix according to claim 16 , said throat comprising a threaded section, said collar rotatably engaged to said threaded section wherein rotation of said collar towards said base elevates said adjustable ramps.
18. The adjustable ramp helix according to claim 16 , said throat comprising a threaded section, said collar rotatably engaged to said threaded section wherein rotation of said collar away from said base lowers said adjustable ramps.
19. An adjustable ramp helix comprising:
a. a base having a plurality of ramp supports an adjustable ramp engaged to each ramp support, and a plurality of apertures traversing the base, each of said adjustable ramps having a foot adapted for positioning within one of said apertures and an arcuate vertically and arcuate laterally bushing face, said base further having a throat having a threaded section; and
b. An elevator comprising a collar rotatably connected to said threaded section, said collar in contact with said feet, said collar adapted for rotation with respect to said throat to alter the elevation of said adjustable ramps relative to said base, said elevator further comprising a positioner said positioner adapted to restrict rotation of said collar relative to said throat.
20. An adjustable ramp helix comprising:
a. a base having a plurality of ramp supports, an adjustable ramp engaged to each ramp support, and a plurality of apertures traversing the base, each of said adjustable ramps having a pin adapted for positioning within one of said apertures and an arcuate vertically and arcuate laterally bushing face, said base further having a throat having a threaded section; and
b. An elevator comprising a collar rotatably connected to said threaded section, said collar in contact with said pins, said collar adapted for rotation with respect to said throat to alter the elevation of said adjustable ramps relative to said base, said elevator further comprising a positioner, said positioner adapted to restrict rotation of said collar relative to said throat.
Priority Applications (1)
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US10/253,552 US20030019322A1 (en) | 1999-03-03 | 2002-09-24 | Adjustable ramp helix |
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US10/253,552 US20030019322A1 (en) | 1999-03-03 | 2002-09-24 | Adjustable ramp helix |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US20050209032A1 (en) * | 2004-01-21 | 2005-09-22 | Xavier-Pierre Aitcin | Continuously variable transmission driven-pulley cam having three cam surfaces and roller therefor |
US20090048046A1 (en) * | 2006-05-02 | 2009-02-19 | Jocelyn Labbe | Driven pulley for a continuously variable transmission |
US20180080534A1 (en) * | 2015-03-24 | 2018-03-22 | Jatco Ltd | Automatic-transmission torque cam device |
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US8328669B2 (en) * | 2002-09-03 | 2012-12-11 | Randy Gene Nouis | Variable touch-point radius CVT helix |
US6958025B2 (en) * | 2003-01-17 | 2005-10-25 | Hoffco/Comet Industries, Inc. | Belt tensioner for use with torque converter |
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CA2650275A1 (en) * | 2006-05-02 | 2007-11-08 | Cvtech R & D Inc. | Reversible driven pulley for a continuously variable transmission |
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US4378221A (en) * | 1981-01-16 | 1983-03-29 | Reliance Electric Company | Torque cam assembly for variable speed drive and follower element therefor |
US4523917A (en) * | 1983-12-27 | 1985-06-18 | Dana Corporation | Variable pitch diameter torque sensing pulley assembly |
US4585429A (en) * | 1984-09-19 | 1986-04-29 | Yamaha Hatsudoki Kabushiki Kaisha | V-belt type continuously variable transmission |
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US5529544A (en) * | 1994-08-24 | 1996-06-25 | Berto; Joseph J. | Drive clutch with multi-staged displacement rate and a method for controlling a drive clutch |
US5516333A (en) | 1994-10-17 | 1996-05-14 | Benson; Steven R. | Torque responsive actuation device for a belt drive system |
US5720681A (en) | 1996-03-18 | 1998-02-24 | Benson; Steven R. | Torque responsive actuation device |
US5538120A (en) * | 1995-03-13 | 1996-07-23 | Lencco Racing Company, Inc. | Clutch bracket retainer for torque sensing clutch mechanisms |
US5562555A (en) | 1995-05-26 | 1996-10-08 | Peterson; Lonn M. | Adjustable flyweights for variable speed belt drive |
US5967286A (en) * | 1997-07-31 | 1999-10-19 | Starting Line Products, Inc. | Adjustable driven clutch |
US6146295A (en) * | 1998-06-25 | 2000-11-14 | Mor; John Matthew | Encapsulated roller for helical bearing surfaces |
US6095937A (en) * | 1998-07-27 | 2000-08-01 | Aaen Performance Parts, Inc. | Torque-responsive clutch with confined rollers |
-
2000
- 2000-03-01 CA CA002299882A patent/CA2299882C/en not_active Expired - Lifetime
- 2000-03-01 US US09/516,752 patent/US6502479B1/en not_active Expired - Lifetime
-
2002
- 2002-09-24 US US10/253,552 patent/US20030019322A1/en not_active Abandoned
Cited By (5)
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US20050209032A1 (en) * | 2004-01-21 | 2005-09-22 | Xavier-Pierre Aitcin | Continuously variable transmission driven-pulley cam having three cam surfaces and roller therefor |
US7674197B2 (en) * | 2004-01-21 | 2010-03-09 | Bombardier Recreational Products Inc. | Continuously variable transmission driven-pulley cam having three cam surfaces and roller therefor |
US20090048046A1 (en) * | 2006-05-02 | 2009-02-19 | Jocelyn Labbe | Driven pulley for a continuously variable transmission |
US7927241B2 (en) * | 2006-05-02 | 2011-04-19 | Cvtech R & D Inc. | Driven pulley for a continuously variable transmission |
US20180080534A1 (en) * | 2015-03-24 | 2018-03-22 | Jatco Ltd | Automatic-transmission torque cam device |
Also Published As
Publication number | Publication date |
---|---|
US6502479B1 (en) | 2003-01-07 |
CA2299882C (en) | 2006-09-19 |
CA2299882A1 (en) | 2000-09-03 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |