|Publication number||USRE31170 E|
|Application number||US 06/139,373|
|Publication date||Mar 8, 1983|
|Filing date||Apr 21, 1980|
|Priority date||Jun 29, 1973|
|Publication number||06139373, 139373, US RE31170 E, US RE31170E, US-E-RE31170, USRE31170 E, USRE31170E|
|Inventors||Martin S. Mazman|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (9), Non-Patent Citations (5), Referenced by (13), Classifications (17), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates generally to exercise devices and more particularly to devices which provide a variable amount of resistance to the user during an exercise movement.
According to current concepts, muscle development is best achieved by exercises which are carried out in such a manner that the muscles are continuously worked at a level of nearly maximum effort during the exercise.
Most currently known exercise devices are not capable of providing this type of exercise because the resistance which they exert remains constant or decreases throughout the exercise movement while the strength exertable by the user's muscles varies at different points in the movement, and generally increases where the machine resistance decreases. Therefore, a degree of resistance which, at one point in an exercise movement may require near maximum effort to overcome, will at some other point in the movement be either too much or too little.
It has, therefore, been a desire of both exercisers and coaches to have an exercise device which can vary the applied resistance during an exercise movement to correspond with variations in available muscle strength. Attempts have been made to satisfy this desire, however, the resultant devices have been excessively complex and expensive.
It is, therefore, a major object of my invention to provide an exercise device in which the resistance varies as the user moves the device through the exercise cycle.
It is also an object of my invention to provide an exercise device of the type described in which the manner of variation of the resistance during the exercise cycle is adjustable.
It is another object of my invention to provide an exercise device of the type described in which the variation of resistance occurs because of changes in the length of a lever arm through which the resistance is applied.
It is a further object of my invention to provide an exercise device of the type described in which the resistance is varied by the vectoring of the force applied to the machine by the user during the exercise cycle.
Still another object of my invention is to provide an exercise device structured to readily withstand heavy forces and extensive use.
Still a further object of my invention is to provide an exercise device of the type described in which the resistance varying mechanism can be incorporated into many types of existing exercise devices without substantially increasing their cost.
Yet another object of my invention is to provide an exercise device of the type described which is relatively inexpensive to manufacture, simple to use and substantially maintenance free.
These and other objects and advantages of my invention will become more readily apparent from the following detailed description of a preferred embodiment and the accompanying drawings in which:
FIG. 1 is an elevational section view of a first preferred embodiment of my invention with movement in the exercise cycle shown in phantom;
FIG. 2 is a sectional view taken on 2--2 in FIG. 1;
FIG. 3 is a front elevational view of the preferred embodiment of FIG. 1;
FIG. 4 is an enlarged perspective view of the movable connection which changes the lever advantage during the exercise cycle;
FIG. 5 is an elevational section view of a second preferred embodiment of my invention;
FIG. 6 is a partial sectional view taken at 6--6 in FIG. 5;
FIG. 7 is a sectional view taken at 7--7 in FIG. 6;
FIG. 8 is a partial sectional view taken at 8--8 in FIG. 5.
FIG. 9 is an enlarged partial side elevational view of my second preferred embodiment showing the first form of a modification for programmed resistance; and
FIG. 10 is an enlarged partial side elevational view of my second preferred embodiment showing a second form of a modification for programmed resistance.
Referring now to the drawings, and particularly FIGS. 1 through 4 thereof, my muscle building exercise device 10 has a floor mounted upstanding frame 12. The frame 12 contains a stack of weights 14 mounted on a pair of guide rods 16. The guide rods 16 are pivotally attached to the lower portion of the frame by pivot connections 18 so that as the weights are lifted the guide rods 16 can pivot inwardly or outwardly of the frame on either side of true vertical to adjust to the path of the weights. The weights 14 have bushed guide holes 20 which travel on the guide rods 16. The weights 14 also have centerholes 22 through which a weight lift rod 24 passes. The number of weights to be lifted are selected by inserting a selector pin 26 through pin holes 28 in the weight lift rod 24 below the bottom weight of the stack selected.
A lever arm 30 is pivotally mounted in the frame 12 on the side opposite the weights 14 by a mounting shaft 32. The lever arm 30 has a handle portion 33 which extends through the frame 12 above the weights 14 and outwardly beyond the frame on the side where the weights are located. Handle bars 34 are provided on its distal end.
The lever arm 30 also has a foot portion 36 connected to the handle portion 33 at the mounting shaft 32 and extending downward and outward from the mounting shaft on the same side of said frame 12 at an obtuse angle to the handle portion. At its distal end the foot portion 36 has a pedal plate 38 disposed for contact by a user's feet.
Still other means for moving the lever arm 30 are provided by a pull cable 40 attached to the handle portion 33 by a selected one of a pair of the ears 42. The cable 40 extends upwardly in the frame 12, over a pair of sheaves 44 on the top of the frame, and down to a pull handle 46.
To attach the weight lift rod 24 to the lever arm 30, a yoke 48 is secured to the top of the lift rod and extends upwardly on either side of the lever arm (see FIG. 4). A roller 50 is mounted between the legs 52 of the yoke 48 and disposed to travel longitudinally along the upper surface 54 of the lever arm 30. The pivotal mounting of the lever arm 30 is so located that the upper surface 54 is disposed in a generally horizontal position when the lifting pressure is first applied to the weight lift rod 24 through the yoke 48. As the user forces the handle bars 34 upward the lever arm 30 pivots about the mounting shaft 32 on the opposite side of the frame 12 and the upper surface 54 becomes inclined toward the pivot point. As this inclining of the upper surface 54 occurs, the roller 50 on the upper end of the weight lift bar 24 tends to move toward the pivot point and pivot the guide rods 16 inwardly in the frame 12.
To control the position of the guide rods 16 and the upper end of the weight lift rod 24, a guide arm 56 is connected between the yoke 48 and the opposite side of frame 12. The guide arm 56 has one end pivotally mounted on a guide arm shaft 58 in the frame 12 and the other end pivotally mounted between the legs 52 of the yoke 48 by mounting pin 60.
The guide arm shaft 58 is mounted on the same side of frame 12 as the lever arm mounting shaft 32, by movable mountings 62. These movable mountings 62 are adjustable to vary the distance between the guide arm shaft 58 and the mounting shaft 32 which pivotally mounts the lever arm 30. Also, the guide arm 56 is formed of two telescopically connected sections 64 which are releasably secured by adjustment holes 66 and an adjustment pin 68. By these means, the guide arm 56 is made adjustable in length and point of pivoting.
Since the guide arm 56 controls the position of the upper end of the weight lift rod 24, it will be understood that with the guide arm shaft 58 positioned as shown in FIG. 1 and the guide arm 56 adjusted at the length shown in FIG. 1, raising the handle portion 33 of lever arm 30 will cause the upper end of the weight lift rod 24 to follow an arcuate path as shown by dotted line 70. During this travel, the roller 50 will move outwardly on the upper surface 54 of the lever arm 30 away from the mounting shaft 32 thereby reducing the mechanical advantage available to the user at the handle bars 34 in lifting the weights 14. The guide rods will first pivot outwardly and then inwardly in the frame 12 about the pivot connections 18 to adjust to the path of the weights.
Since the lever arm 30 and the guide arm 56 in the arrangement of FIG. 1 are so interrelated that they serve as opposite legs of a parellogram as the lever arm 30 passes through its lifting movement, it will be understood that the distance which the roller 50 will travel outward on the upper surface 54 of the lever arm 30 at any particular point in the movement, and the rate of that travel, will be determined by the distance between the mounting shaft 32 and the guide arm shaft 58, and the length of the guide arm 56. Since these factors can be varied by changing the length of guide arm 56 using adjustment holes 66 and adjustment pin 68, and by changing the distance between the guide arm shaft 68 and mounting shaft 32 by using the movable mountings 62, the location and rate of change of the variations in resistance experienced by the user at particular points in the exercise movement are adjustable. Furthermore, adjustment of the length and pivot point of the guide arm 56 will change the manner in which the force vectoring occurs, thereby modifying the resistance variations brought about by the lever arm changes.
The change in mechanical advantage is brought about, of course, by movement of the roller 50 during the exercise movement outwardly along the upper surface 54 of the lever arm 30 to positions more distant from the pivot point of the lever arm at the mounting shaft 32 than the position in which the roller 50 was located when the exercise cycle began, and is further affected by the force vectoring.
In FIG. 1 I have illustrated the vectoring of forces which occur during the exercise movement. The letter W represents the weight vector which resolves itself, at the position shown in phantom, into axial weight vector W1, directed toward the pivot point of lever arm 30, and moment weight vector W2, directed against the pivotal movement urged by the user. Since the guide arm 56 resists the force of axial weight vector W1 and prevents movement of the roller 52 toward the mounting shaft 32, it must supply an equal and opposite resistance vector R1. Since the guide arm 56 can only apply resistance force axially along the guide arm, however, the R1 vector must be derived from a guide arm resistance force vector R. This results in a moment resistance vector R2 being applied by the guide arm 56 which combines with the moment weight vector W2 to increase the resultant moment resistance applied against the pivotal movement urged by the user. Since the moment weight vector W2 is reduced as the lever arm 30 is pivoted upwardly, this must be overcome by changes in the lever arm and an increase of the R2 moment resistance vector in order for the user to meet with an increasing effective resistance during the upward movement of the lever arm. At the point shown in phantom in FIG. 1 it will be seen that the addition of the weight moment vector W2 and the resistance moment vector R2 still do not equal the main weight vector W. The lever arm increase more than compensates for this reduction of the effective moment force, however, so the user experiences more resistance at this point than at the staring point of the exercise where the lever arm 30 is substantially horizontal. At other points in the exercise movement the addition of the W2 and R2 vectors will exceed the main weight vector W and will, therefore, combine with the lever arm change to further increase the resistance experienced by the user. The reduction in the W2 vector during the exercise movement illustrates the fault in presently known exercise devices which use a pivoted lever arm similar to this embodiment. As the lever arm moves closer to vertical more and more of the weight is supported by the pivot and the effective resistance to the user is reduced. Generally this occurs where the user's muscle strength is increasing, so full muscle development is not achieved. My device overcomes this disadvantage, as explained.
It will also be understood that the same effect with respect to variation of the user's mechanical advantage and vectoring of the resultant forces will be achieved by moving the lever arm 30 by means of the foot portion 36 through foot pedal plate 38 or by the cable 40 through handle 46.
Having described the structural details of the first preferred embodiment of my exercising device, I will now describe its operation.
The operation will be explained in conjunction with the practice of exercises typically used in machines of this type. One such exercise is a bench press. In this technique the exerciser lies on his back on a bench with his head toward the exercising device and grips the handle bars 34 with his hands. The height of the bench is such that his arms are well retracted with his hands located near his chest when the exercise is started. Starting with the handle bars 34 just above him the user then extends his arms and presses the handle bars 34 upward until his arms reach their fully extended position above him. Then he slowly retracts his arms again lowering the handle bars 34 to their original position.
The user will normally select, for this exercise, the maximum weight which he is able to lift when his arms are in retracted position. Having selected these weights by placing the pin 26 in the proper hole 28 of the weight lift rod 24, the user then presses upwardly on the handle bars 34. As the handle bar 34 is forced upward, the weights 14 are carried upward by the weight lift rod 24 because of the engagement of the roller 50 with the upper surface 54 of the lever arm 30.
The more the lever arm 30 is driven up, the further roller 50 is moved away from the mounting shaft 32 about which the lever arm 30 pivots. This, of course, moves the lifting point of the weights closer to the handle bars 34 as the lever arm 30 is forced upwardly, and the user is thus subjected to a decreasing mechanical advantage and a greater resistance from the same amount of weight. When the user lowers the handle bars 34, the opposite movement of roller 50 occurs and the strength required to support the weight stack as the arms are retracted becomes less.
At the same time the vectoring of the weight force W into a reducing W2 weight moment vector is at least partially overcome, and at some points is more than overcome, by the movement resistance vector R2, thus further enhancing the increase in resistance experienced by the user. Since neither the lever arm change nor the force vectoring change in this embodiment is linear, the resistance changes experienced by the user are non-linear during the exercise movement, and as explained, will vary depending on the guide arm pivot location and length.
It will be understood by those skilled in the art that the variation of resistance during the exercise movement of this exercise does not exactly correspond with the available muscle strength of the user at various points in the movement. A closer correspondence may be achieved, however, by contour adaptions to the upper surface 54 of the lever arm 30 or the periphery of the roller 50, as will be explained later.
In FIGS. 5 through 8 I show a modified form of my invention represented generally by the numeral 80. The modified form has a frame 82 substantially identical to the frame 12 in my first embodiment which carries weight 84 on one side. The weights 84 are mounted on guide rods 86 in the same manner as in my first embodiment except that in this embodiment the guide rods are not pivotally mounted to the frame but are rigidly affixed thereto at top and bottom. The weights 84 have bushed guide holes 88 which travel on the guide rods 86, in the same manner as in my first embodiment. The weights 84 are engaged and lifted by a weight lift rod 90 which passes through center holes 92 in the center of the weights in the same manner as in my first embodiment, and the number of weights selected is regulated by inserting a pin 94 into pin holes 96 in the weight lift rod.
The second embodiment of my invention also has a lever arm 100 pivotally mounted in the frame 82 on a mounting shaft 102 disposed on the opposite side of the frame from the weights 84. The lever arm 100 has a handle portion 104 which extends across the frame from the mounting shaft 102, over the weights 84 and outside the frame 12, and has handle bars 106 mounted on its distal end. A yoke 108 is attached to the upper end of the weight lift rod 90 and extends upward about each side of the lever arm 100. A main roller 110 is mounted between the upstanding legs 112 of the yoke 108 and disposed to roll on the upper surface 114 of the lever arm.
In this second embodiment, moving the lever arm 100 upwardly about its pivot point at the mounting shaft 102 by applying upward pressure to the handle will not only carry the weights 84 up the guide rods 86 but will force them against the rods as the lever arm moves through its arcuate path. The weights 84 are forced against the guide rods by reason of the tendency of the main roller 110 to travel toward the mounting shaft 102 on the upper surface 114 of the lever arm 100 when the lever arm is raised to incline the upper surface toward the mounting shaft. To prevent excessive wear on the guide rods 86 and the guide holes 88 of the weights 84, a pair of alignment rollers 116 is provided on the yoke 108 on each side of the main roller 110. The alignment rollers 116 travel on the guide rods 86 and hold the weight lift rod 90 in vertical alignment with the guide rods. This action of the alignment rollers 116 holds the stack of weights centered on the guide rods 86 and prevents excessive wear on one side of the bushed guide holes 88.
To accommodate the main roller 110 and the alignment rollers 116, the legs 112 of yoke 108 extend outwardly from the guide rods 86 and mount a roller shaft 118 therebetween which carries the rollers. Spacers 120 are provided between the legs 112 and the alignment rollers 116 to hold the alignment rollers in alignment with the guide rods 86.
In this second embodiment, as in the first, the main roller 110 is caused to move outward on the upper surface 114 of the lever arm 100 as the handle portion 104 is raised by the handle bars 106 in the exercise movement. This movement of the main roller 110 reduces the mechanical advantage to the user, in the same manner as in my first embodiment, however, the amount and rate of change will not be the same as in my first embodiment.
Vectoring of the forces will occur in this embodiment, in a manner generally similar to that described in my first embodiment, and this vectoring is indicated by the vector diagram in FIG. 5. Again, W is the weight resistance vector which resolves itself into an axial weight vector W1, and a moment weight vector W2. Movement toward the pivot point by the roller 110 is prevented by vector R1, which results from the vectoring of the main resistance vector R applied by the guide rods 86 through the alignment rollers 116. When the main resistance vector R divides to provide the axial resistance vector R1 equal and opposite to weight axial vector W, a resistance moment vector R2 results. Moment vectors W2 and R2 combine into a moment resistance which resists the pivotal movement being urged by the user.
The operation of my second preferred embodiment is substantially the same as for my first embodiment, except that the proportionate change of mechanical advantage as the lever arm 100 moves through its cycle is somewhat different. This is due to the direct vertical path of travel of the yoke 108 along the guide rods 86. My second embodiment, of course, does not provide means for changing the lever advantage conditions as in my first embodiment where this is accomplished by the adjustable length and pivot point of the guide arm 64.
In this embodiment, as the handle bars 106 are raised, the weight lift rod 90 is raised by engagement with the main roller 110 on the upper surface 114 of the lever arm 100. Since the alignment rollers 116 travel upward on the guide rods 86, the main roller 110 is drawn outwardly along the upper surface 114 as the lever arm 110 continues to move upwardly. This, together with the vectoring described, reduces the mechanical advantage to the user, and requires him to exert more force to lift the same weight. When the handle bars 106 are lowered again the main roller 110 moves inward on the lever arm 100, returning the lost mechanical advantage to the user.
From this description of the structure and operation of preferred embodiment it will be understood that my exercise device can readily fulfill the desire for a machine with a resistance which varies during the exercise movement.
I will now describe further modifications of my invention which can be utilized to more closely match the resistance at any point in the exercise movement to the user's potential muscle strength at that point.
Actually, in performing a bench press, for example, the user's potential muscle strength is relatively high at the beginning of the exercise movement where his arms are fully retracted and highest at the end of the movement as his arms reach full extension. About midway through the exercise movement, however, there is a weak point in muscle strength potential. This occurs about the position where the upper and lower arm form a right angle at the elbow. In weight lifting exercises this point is sometimes referred to as a sticky spot.
In FIGS. 9 and 10 I show modifications in my second embodiment which adapt my device to the muscle strength positions in a bench press exercise movement. Referring to FIG. 9, the numeral 120 designates a guide block with a contoured upper face 122. The guide block 120 is secured to the upper surface 114 of the lever arm 100 in the area of travel of the roller 110 by attachment bolts 124. As the roller 110 moves away from the pivot point of the lever arm 100 it is caused first to travel upwardly at a more rapid rate than would normally occur when it travels on the flat upper surface 114 of the lever arm. Then the roller passes into a back-off point on the contoured surface where the upward travel is virtually halted, and, finally, the roller commences further upward travel ar an accelerated rate as it moves outward over the last portion of the guide block 120.
In FIG. 10 I accomplish a similar result using a contoured roller 126 and a rack gear 128. The rack gear 128 is secured to the upper surface 114 of the lever arm 100 by attachment bolts 130. The contoured roller 126 has peripheral teeth 132 which engage the rack gear 128 and prevent any skidding of the roller during movement along the lever arm. The contour roller 126 is interchangeable with rollers of other contours.
With either of these modifications it will be understood that by changing the guide block 120 or the contoured roller 126 I can adapt my device to provide nearly any desired variation of resistance in an exercise cycle.
In utilizing these modifications it should be understood that the variations of resistance experienced by the user are as much and possibly more, the result of changes in the manner that the forces are vectored as they are the result of changes in the lever arm length. Changes in the force vectoring occur by reason of the different angle of incidence between the roller 110 and the lever arm 100 due to the contoured surface 122 on the guide block 120, or between the contoured roller 126 and the rack gear 128 (see FIGS. 9 and 10).
Because of the simplicity of structure by which my invention accomplishes the desired variation in resistance, there are numerous other modifications which could be easily incorporated. The pivot point of the lever arm could be made movable with respect to the frame to modify the manner in which the mechanical advantage is changed during exercise movement, and a suitable mechanism could be employed to vary the lever arm length during an exercise movement by moving the lever arm with respect to the pivot point rather than with respect to the point at which the weights are connected.
Also, of course, resistance may be provided by means other than weights, and still be made fully compatible with my device.
From this description it should be understood that I have provided an exercise device fully capable of attaining the objects and providing the advantages heretofore granted it. It should also be understood that the variable resistance provided by my device is adaptable to my different types of exercise devices. By arranging the change of lever advantage to provide greater resistance at those my in the exercise cycle where the user has the greatest available strength, maximum muscle development can be achieved with my device.
Finally, it will be understood that my exercise device can be inexpensively made, and even combined into existing equipment, and is simple to use.
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|1||*||Defendents Response to Plaintiff's Motion, Statement of Genuine Issues, Mazman Affidavit in Civil Action 79-4868-AAH, U.S.D.C. for C.D. of Ca.|
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|4||*||Notice of Motion and Motion, Points and Authorities with Exhibits 1-7 of Plaintiff in Civil Action No. 79-4868-AAH, U.S.D.C. for C.D. of Ca.|
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4964632 *||Sep 6, 1989||Oct 23, 1990||Diversified Products Corporation||Compact multi-function weight-training exerciser|
|US5029849 *||Apr 12, 1989||Jul 9, 1991||Nurkowski Paul S||Varying resistance weightlifting apparatus|
|US5080351 *||Jun 15, 1990||Jan 14, 1992||Diversified Products Corporation||Compact multi-function weight-training exerciser|
|US5085430 *||Feb 20, 1991||Feb 4, 1992||Pacific Fitness Corporation||Multiple station exercise apparatus|
|US5417633 *||Dec 27, 1993||May 23, 1995||Pacific Fitness Corporation||Multiple station exercise apparatus|
|US5529558 *||Jun 7, 1995||Jun 25, 1996||Jam'n Fitness Corp.||Exercise apparatus|
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|US7393309||Feb 28, 2006||Jul 1, 2008||Webber Randall T||Dual action weightlifting machine|
|US7909743||Mar 19, 2010||Mar 22, 2011||Hoist Fitness Systems, Inc.||Dual action weightlifting machine|
|US7922635||Mar 8, 2001||Apr 12, 2011||Nautilus, Inc.||Adjustable-load unitary multi-position bench exercise unit|
|US8328698||Mar 19, 2010||Dec 11, 2012||Hoist Fitness Systems, Inc.||Exercise bar assembly for dual action weightlifting machine|
|US20020077230 *||Mar 8, 2001||Jun 20, 2002||Lull Andrew P.||Adjustable-load unitary multi-position bench exercise unit|
|US20060240957 *||Jun 30, 2006||Oct 26, 2006||Lull Andrew P||Leg press and abdominal crunch exercise machine|
|U.S. Classification||482/98, 482/99|
|International Classification||A63B21/00, A63B21/062, A63B21/06|
|Cooperative Classification||A63B23/03525, A63B21/1492, A63B2021/0626, A63B2021/0617, A63B21/1469, A63B21/0615, A63B21/155|
|European Classification||A63B21/15F6C, A63B21/14M6, A63B21/14K4H, A63B23/035C2, A63B21/06F|
|Dec 28, 1984||AS||Assignment|
Owner name: UNIVERSAL GYM EQUIPMENT, INC., 930 27TH AVENUE, S.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MAZMAN, MARTIN S.;REEL/FRAME:004347/0909
Effective date: 19841218
|Sep 21, 1998||AS||Assignment|
Owner name: FF ACQUISITION CORP., MISSISSIPPI
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CONGRESS FINANCIAL CORPORATION (FLORIDA);REEL/FRAME:009935/0317
Effective date: 19980818
|Sep 25, 1998||AS||Assignment|
Owner name: CONGRESS FINANCIAL CORPORATION (FLORIDA), FLORIDA
Free format text: CERTIFICATE OF TITLE;ASSIGNOR:UNIVERSAL GYM EQUIPMENT, INC.;REEL/FRAME:009490/0094
Effective date: 19980818
Owner name: CONGRESS FINANCIAL CORPORATION (FLORIDA), FLORIDA
Free format text: CERTIFICATE OF SALE;ASSIGNOR:UNIVERSAL GYM EQUIPMENT, INC.;REEL/FRAME:009507/0243
Effective date: 19980806