US 1216865 A
Description (OCR text may contain errors)
F. 0. SMITH; MECHANISM FOR TRANSMITTING POWER. APPLICATION FILED DEC-31.1915.
Patented Feb. 20, 1917.
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MECHANISM FOR TRANSMITTING POWER. APPLICATION men 05cm. 1915. 1,216,865. Patented Feb. 20,1917. 3 SHEETS-SHEET 2.
F. D. SMITH.
MECHANISM FOR TRANSMITTING POWER.
APPLICATION FILED 050.31. 1915.
Patented Feb. 20, 1917.
3 SHEETS-SHEET 3.
FRANKLIN D. SMITH, OF DEA DWO'OD, SOUTH DAKOTA.
' MECHANISM ro'a TRANSMITTING rowna.
Specification of Letters Patent.
Patented Feb. 2%, 1917.
Application filed December 31, 1915. Serial No. 69,586.
To all whom it may concern:
Be it known that I, FRANKLIN D. SMITH, a citizen of the United States, residing at Deadwood, in the county of Lawrence and State of South Dakota, have invented certain new and useful Improvements in Mechanism for Transmitting Power, of which the following is a specification.
This invention relates to mechanism for transmitting power from a rotating member to a reciprocating member and has for its object the provision of mechanism whereby a powerful movement willbe imparted to the reciprocating element or elements and the direction of movement will be automatically reversed at the end of a stroke. The stated object and such other objects as will incidentally appear from the following description are attained in mechanism of the character illustrated in the accompanying drawings and the invention resides in certain novel features which will be particularly pointed out in the claims following the description.
In the accompanying drawings:
Figure 1 is a plan view of the preferred embodiment of the invention; I
Fig. 2 is a-vertical section taken on the line 22 of Fig. 1;
Fig. 3 is a longitudinal section taken on the line 33 of Fig. 1;
Fig. 4 is a detail section through the shifting bar;
Figs. 5 and 6 are respectively a plan and an elevation showing a modification;
Fig. 7 is a detail rear elevation; and
Fig. 8 is a detail perspective view of the reversing levers. b I In carrying out my invention, I employ a supporting frame which may .be of any preferred or convenient constructionand is provided with uprights 1 sufficient in numher to provide bearings for all the shafts and moving-parts. The motor shaft 2 is journaled in alined bearings disposed preferably on the central transverse line of the supporting frame and this driving shaft is equipped with a pulley 3 at its front or outer end to receive motion fromany convenient engine or prime motor. On the inner end of the shaft 2 is a beveled pinion 4 which is adapted to be engaged alternately by beveled gears 5 and 6 which are keyed upon the hollow driven shaft 7 so that they may slide upon said shaft but are .constrained to rotate therewith. The said beveled gears 5 and 6 have a common hub 8 formed with a central annular groove 9 engaged by pins 10 on a yoke 11 formed on the inner or front end of a reversing lever 12. The said lever 12 isfulcrurned upon the supporting frame immediately adjacent the driven shaft 7 and between the gears 5 and (iso' that, when the lever is vibrated, the said gears will be moved longitudinally of the driven shaft and caused to alternately house them and be released from the beveled pinion 4. The hollow driven shaft 7 is inter- 'nally threaded. at its opposite ends and the threads are of opposite pitch while in the said ends are mounted the plungers or reciprocating members 13 and 14 which are externally threaded v so as to engage the internal threads of the hollow shaft, as clearly shown in Fig. 3. These pistons, plungers or reciprocating members are constructed at their ends in any convenient manner so as to be coupled to the mechanism to be driven and it will be readily understood that they will be thereby held against rotation so that, when the shaft 7 is rotated, the said members 13 and 142 will be caused to move inwardly or outwardly relative to said shaft according to the direction of rotation of the same.
To one of the pistons or reciprocating members, the member 14 in the present illustration, I secure shifting bar 15 which has one end bent forwardlv so as to be swiveled or. otherwise connected with the reciprocatmg member and has its main portion slid- .ably mounted upon the supporting frame parallel with the driven shaft. This reversing bar is hollow and is constructedwith longitudinal slots 16 in its walls, as shown most clearly in Fig. 4, and the said slots receive the inner end of a primary reversing lever 17 which is fulcrumed upon'th-e supporting frame in rear of the reversing bar and has its outer end upturned, as shown at 18, to be pivoted to the secondary reversing lever 12, the fulcrums of the said levers l2 and 17 being respectively at the inner and the outer side of the reversingbar, as shown inFig. 1.- The slotsh16 should be equal in length to the stroke of the piston and coiled springs 18 are disposed within the reversing car at oppositefisides of the lever 17, as
shown in Fig. 4. so as to cushion the movement of the said lever and permit the same to remain relatively stationary until theworking spring has acquired a certain tension. Pins 01' other stops 19 are provided in the reversing bar against the outer ends of the springs 18 and these stops are adjustable so to regulate the tension at which the spring will become operative. The reversing lever 12 is provided in advance of its pivotal connection with the lever 17 with a slot 20 in which is received the lower reduced end or tongue 21 of a weighted arm 22 fulcrumed upon the supporting frame rotation of said shaft will cause the pistons '13 and 14; to move outwardly 0r inwardly, as the case may be. The reversing bar 15, of course, follows the movement of the member to which it is connected and as the parts approach the end of the stroke,'the spring 18 which is being carried toward the reversing lever 17 will be gradually compressed so that the reversing'bar 15 will move past the said lever until the spring has reached the tension previously calculated and for which it has been set as necessary to shift the lever. Assuming that the pinion 4 is in mesh with the gear 5, as illustrated in Fig. 1, the reciprocating or reversing .bar 15 will be moving toward the right. As it approaches the limit of its stroke, the spring 18 at the left side of the lever 17 will be compressed and pressure exerted upon the innerend of said lever to swing it about its fulcrum so that the outer end of the lever will be moved to the left. This movement of the lever 17 will be transmitted directly to the lever 12 so that the inner end of said lever will swing to the right and, consequently, the gear 5 will be moved out of engagement with the pinion i and the gear 6 moved into engagement with the same whereupon the direction of 'rotation of the shaft will be reversed.
WVhen the outer end of the lever 12 swings to the left as just described, the lower end of the weighted arm or lever 22 will be likewise swung to the left so that the weight 23 will be carried to a position vertically over the fulcrum of the lever. The effort of the spring 18 to expand and the momentum of the weight will carry the weight beyond the vertical position and, consequently, shift the parts to the opposite limit of their movement quickly so that the engagement of the gear 6 with the pinion 4 will be positive.
InfFigs. 5 and 6, I have illustrated the same mechanism applied to a driven shaft which is equipped with fast and loose pulleys upon which driving belts are run. In the said figures, 24 designates the driven shaft, 25 the fast pulley thereon and 26 the loose pulleys. Two belts 27 and 2-8, the latter being closed, are arranged to pass around these pulleys and the driven shaft will rotate in one or the other direction accordingly as the straight or crossed belt is in engagement with the fast pulley 25. In this form of the invention, the secondary reversing lever 29 is provided with a fork 30 at its inner end which is adapted to engage the belts and shift the same as the lever is vibrated, which action is caused in exactly the same manner as in the form ,previously described.
It will be readily notedthat the mechanism devised by me is very simple and as screws are employed to impart movement to the reciprocating members, great power is secured although movement is comparatively slow. This slow movement, however, facilitates the automatic reversing of the direction of movement inasmuch as the reversing bar may move past the end of the primary reversing lever until the spring bearing upon the said lever reaches the desired tension whereupon the lever will be quickly shifted and the throw of the lever positively completed through the action of the weighted arm or pendulum. While 1 have illustrated two reciprocating members, it will, of course, be obvious'that one of said members may be omitted and other changes may be'made in the minor details without involving a departure from the spirit or scope of the invention as the same is defined in the appended claims.
Having, thus described the invention,
portion of the reversing bar, and a second lever having one end pivoted to the outer end of the first-mentioned lever and its opposite end arranged to shift the operative connection between the driving and driven shafts. V
i 2. In mechanism of the character set forth, the combination of a driven shaft, a continuously rotating. driving shaft, operative connections between the driving and driven shafts, a reciprocating member actuated by'the driven shaft, a reversing bar carried by'the reciprocating member and provided with alongitudinal slot, a reversing lever having one end playing in said slot, yieldable members carried by the reversing barand bearing against the opposite sides of the reversing lever, and a second lever having one end pivoted to the free end of the first-mentioned lever and its opposite end arranged to shift the operative connections between the driving and driven shafts.
8. In mechanism of the character set forth, the combination of a driven shaft, a continuously rotating driving shaft, opera ive connections between the driving and driven shafts, a reciprocating member actuated by the driven shaft, a reversing bar carried by the reciprocating member, a reversing lever having one end disposed to be actuated by the reversing bar, a second lever having one end pivoted to the outer end of the first-mentioned lever and its opposits end arranged to shift the operative connections between the driving and driven shafts, and means for accelerating the movement of the second lever.
' 4:. In a mechanism of the character set forth, the combination of a driven shaft, oppositely disposed gears on said shaft, a continuously rotating shaft disposed between the said gears, a reciprocating member actuated by said driven shaft, a reversing bar carried by said reciprocating member, a primary reversing lever having one end loosely engaged by the reversing bar, a secondary reversing lever fulcrumed between its ends and having its inner end connected with the gears on. the hollow shaft and its outer end pivoted to the outer end of the first-mentioned reversin lever and means whereby the movement of the reversing bar will actuate the primary lever. 5.-In a mechanism of the character set forth, the combination of a driven shaft, a reciprocating member actuated by said shaft, oppositely disposed gears mounted on said shaft, a continuously rotating driving shaft disposed between said gears and equipped to mesh with either of the same, a
reversing bar carried by the reciprocating member and having a longitudinal slot, at primary reversing lever having its inner end fitted loosely in said slot, springs disposed within the reversing bar, and a secondary reversing lever pivoted near its outer end tothe outer end of the primary reversing lever and having its inner end connected with the gears on the driven shaft.
6. In a mechanism of the character set forth, the combination of a driven shaft,
oppositely disposed gears on said shaft, a
whereby the movement of the reversing bar will actuate the primary reversing lever, and an arm fulcrumed above the secondary lever and having its lower end loosely engaging the same and provided with a weight above its fulcrum.
In testimony whereof, I affix my signature.
FRANKLIN D. SMITH. [L. s.]
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.