US2797584A - Apparatus for driving a tool through a predetermined stroke - Google Patents

Description

July 2, 1957 M. BALSAM I 2,797,584

APPARATUS FOR DRIVING A TOOL THROUGH A PREDETERMINED STROKE Filid May 4, 1953 4 Sheets-Sheet l 5s I /J A I I INVENTOR. 4 Maumcs I"). BHLSAM July 2, 1957 M. M. BALSAM 2,797,584

APPARATUS FOR DRIVINGv A TQOL THROUGH A PREDETERMINED STROKE Filed My 4, 1953 v 4 Sheets-Sheet 2 INVENTOR. MAURICE M. I BAL SAP? wiw , July 2, 1957 M. M. BALSAM 2,797,534

' APPARATUS FOR DRIVING A TOOL THROUGH A PREDETERMINED STROKE Filed May 4, 1983. v 4'Sheets-She et a INVENTOR. Mnumcz m.

United States Patent APPARATUS FOR DRIVING A T061. THROUGH A PREDETERMINED STROKE Maurice M. Balsam, New York, N. Y.

Application May 4, 1953, Serial No. 352,886

Claims. (CI. 74-42) suddenly and at a very fast and powerful rate so that with conventional machines it is essential that proper guides be provided for the tools. Moreover, due to the fast and powerful movement by the conventional machines of this type, injuries both to the apparatus and operators are a fairly frequent occurrence. Such injuries also result from the fact that these known machines re peatedly drive the tools through their driving stroke as long as an actuating member is engaged, so that if the operator does not, for example, immediately release a foot pedal or the like which actuates the machine, the tool is driven more than once.

One of the objects of the present invention is to overcome drawbacks of the above mentioned type by providing a tool driving apparatus which requires only a relatively small amount of energy. a

A further object of the present invention is to provide a tool driving apparatus which drives the tool at a relatively slow rate so that elaborate structures to take up shock and the like are not required.

Another object of the present invention is to provide a means to enable a tool to yieldably engage an object to be worked on before being driven against the latter.

An additional object of the present invention is totprovide a means for guaranteeing that a drive means will become automatically disengaged from a tool after the latter is driven through one stroke, even though the actuating member for the drive means is still engaged.

Still another object of the present invention is to provide an apparatus capable of accomplishing all of the above objects while at the same time being made up of a relatively small number of simple and ruggedly constructed parts.

With the above objects in view, the present invention mainly consists of an apparatus for driving a tool through a predetermined stroke, this apparatus including a support means which supports a tool carrying means for movement through a predetermined stroke. A drive means is mounted on the support means for driving the tool carrying means through the predetermined stroke, and a transe mission means, for releasably interconnecting the tool carrying means with the drive means to transmit a drive from the drive means to the tool carrying means to drive the latter through its predetermined stroke, is connected to the tool carrying means for movement between a rest position out of engagement with the drive means and an operating position in engagement with the drive means. A moving means is mounted on the support means and i located adjacent to the transmission means for moving the latter from its rest to its operating position, and a disengaging means is located on the support means for automatically disengaging the transmission means from the drive means after the tool carrying means has been driven through its predetermined stroke.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

Fig. 1 is a partly sectional, side elevational view of an apparatus constructed in accordance with the present in: vention;

Fig. 2 is a fragmentary view of a part of the structure of Fig. 1 shown in a different position thereof;

Fig. 3 is a fragmentary view of a part of the structure of Fig. 1 shown in still another position thereof;

Fig. 4 is a view taken along the line 44 of Fig. 1 in the direction of the arrows;

Fig. 5 is a fragmentary, partly sectional view of a detail of the apparatus of the invention taken along the line 5-5 of Fig. 4 in the direction of the arrows;

Figs. 6 and 7 are respectively side and front views of a transmission means constructed in accordance with the present invention;

Figs. 8 and 9 are respectively side and front views of a moving member constructed in accordance with the present invention; and

Fig. 10 is a fragmentary view of the drive apparatus of the present invention.

Referring now to the drawings, and in particular to Fig. 1 thereof, it will be seen that the apparatus of the invention includes a support means 15 in the form of a frame 16 having a pair of spaced top sections 17 (Figs. 1 and'4) which carry a pivot pin 18. A tool carrying means in the form of an elongated member 19 having suitable openings formed therein is turnably carried at one end thereof by the pin 18, and a tool 20 is pivotally suspended from the tool carrying means 19 to make an impression or the like on a work piece located on the portion 21 of the supporting frame 16, for example.

A transmission means 22 is connected to the tool carrying means 19 for movement between a rest and an operating position, this transmission means being best shown in Figs. 6 and 7 and comprising at its end portion adjacent to the tool carrying member 19, a pair of opposite side parts 23 each of which is formed with an elongated slot 24, these slots of the opposite side parts 23 being aligned with each other.

.30 is fixed to the member 28 adjacent to the bottom thereof, and a spring 31 is located about the bottom end portion of the screw member 28 and abuts against the collar 30, this spring 31 also being located about a stem 32 fixed to a U-shaped member 33 which is urged toward the pivot pin 34 by the spring 31, this pivot pin 34 extending through one of the openings of the tool carrying member 19 and the slots 24 so that the spring means form-ed by members 2833 urge the pivot pin 34 to one end of the slots 24.

. As is apparent from Fig. 5, the side parts 23 are pro videdwit-h guide members 35 which guide the U-shaped member ,33 for movement along the space between the side parts 23, and this U-shaped member 33 engages the top of the tool carrying means 19 to urge the latter downwardly and the transmission means 22 upwardly until the pin 34 engages, the bottom ends of the slots 24.

The block 25 is formed with a threaded bore into which a threaded stud 36 extends, this stud 36 having a pair of lock nuts 37 thereon, the stud 36 also extending into a threaded opening of a block 38 located between and fixed to a second pair of side parts 39 of the transmission means 22. The block 38 is fixed to side parts 39 in the same way that block 25 is fixed to side parts 23, and a member 49 having a free hooked end portion 41 is fixed to the side parts 39 at the end thereof opposite from block 38, as is shown in Figs, 6 and 7. A pin 42 is fixed to the side parts 39 and extends therebetween as shown in Fig. 7.

As is most clearly shown in Figs. 4 and 10, the drive for the apparatus of the invention is derived from an electric motor 43 of relatively small size which has its shaft fixed to a worm 44 engaging a worm wheel 45 which is in turn fixed to a drive shaft 46 mounted for rotation on the supporting frame 16, as is most clearly shown in Fig. 4. A disc 47 is fixed to the drive shaft 46 for rotation therewith, and it will be seen from Fig.4 that this drive shaft is supported not only by the opposite sides of supporting frame 16, but also by an intermediate wall 48. A pair of pins 49 is fixed to the disc 47 for rotation therewith and extends toward the wall 48. As is most clearly shown in Figs. 1-3, the pins 49 are located on opposite sides of the drive shaft 46 and at the same radial distance therefrom so that when the disc 47 turns in the direction of the arrow 50, the pins 49 rotate through a predetermined circular path.

As is shown in Fig. l, the supporting frame 16 carries a spring-pressed stop pin 51 which limits movement of the transmission means 22 in a counter-clockwise direction about its pivotal connection to the tool carrying means .19. A spring 52 is fixed to the support means and the transmission means 22 to urge the latter to the rest position shown in Fig. 1.

As is shown in Fig. l, a guide block 53 is located between the side walls of the supporting frame 16, and a moving member 54 engages the inclined surface of this guide block for reciprocating movement therealong. As is apparent from Figs. 8 and 9 which show the details of this moving member, the latter includes a pair of opposite side .parts 55 connected at one end to the hooked member 56 and at their opposite end to a pivot pin 57 which, as is shown'in Fig. 1, extends through an opening of a foot pedal 58 pivotally mounted on the supporting frame 16 at 59 and being urged to the rest position there of, shown in Fig. 1, against the block 53 by the spring 60, a stop bar 61 being fixed to the supporting frame 66 beneath the foot pedal 58 to limit the downward movement thereof against the action of the spring 60.

The above described apparatus operates as follows:

In the position of Fig. 1, the apparatus is at rest and the operator places a work piece to be engaged by the tool 20, for example, beneath the latter. Then, the operator depresses the foot pedal 58 so that it rotates about the pivot 59 until it engages the stop 61. As is evident from Fig. 1, this depression of the foot pedal 58 will cause the moving member 54 to move downwardly along the block 53 so that the hooked end portion 56 of moving member 54 engages pin 42 of the transmission means 22 and turns the latter on the tool carrying means 19 in a clockwise direction, as viewed in Fig. 1, against the action of spring 52.

As may be seen from Fig. 2, this movement of the transmission means 22 upon depression of the foot pedal 58 causes the free hooked end 41 of transmission means 22 to engage the drive shaft 46 and to become located within the circular path through which the pins 49 rotate. The first of these pins to engage the hooked end 41, that is, the top pin shown in Fig. 2, will move the transmis' sion means downwardly to turn the tool carrying means 19 through its stroke in a clockwise direction about pivot 18, as viewed in Fig. 1.

Thus, the transmission means 22 is moved downwardly against the action of spring 52 until the pin 49 engaging the hooked end portion 41 moves slightly beyond the lowermost part of its stroke, as is shown in Fig. 3. At this point, the hooked end portion 40 is engaged by the drive shaft 46 to be prevented by the latter from moving with the pin 49, so that this drive shaft 46 acts as an automatic disengaging means for disengaging the transmission means 22 from either of the pins 49 when the tool carrying means 19 has been turned through its predetermined stroke. When the hooked end 41 is disengaged from the drive means, the transmission means 22 is moved under the influence of the spring means 52 against the stop 51 and back to its rest position in Fig. 1 where it is located out of the path through which. pins 49 move.

As is evident from Fig. l, the pin 42 moves downwardly away from the hooked end 56 of moving mcmher 54 when the hooked end 41 of transmission means 22 is engaged :by a drive pin 49, so that the drive means automatically disengages the transmission means 22 from the moving means which moves it into its operating position, and it is impossible for the transmission 22 to again become located in its operating position until the foot pedal 58 is again actuated.

It is evident that during engagement of a drive pin 49 with the transmission means 22, the latter moves in a substantially downward direction to turn the tool carrying member 19 until the tool 20 engages a work piece. At this point, the spring 31 is compressed while the tool 20 remains in engagement with the work piece, and this affords the operator an opportunity to very accurately set the tool 20 on the work piece during the period that the spring 31 is being compressed. When the tops of the slots 24 engage the pin 34, the movement of the tool is continued, so that the apparatus of the invention provides a period of time during which the tool engages the workpiece and may be adjusted thereon before the tool continues to move in its driving stroke.

As was mentioned above, the motor 43 is of a fairly small size and the gear reduction obtained through worm 44 and worm wheel 45 is such that disc 47 rotates at a very slow rate. Thus, the period during which the tool 20 resiliently bears against the workpiece is fairly substantial.

It will be seen from Fig. 4 that the free hooked end 41 of the transmission means is located between the wall 48 and the disc 47, and that the pins 49 extend toward wall 48 while the left wall of supporting frame l6 shown in Fig. 4 is located close to the disc 47. This arrangement provides supports for the shaft 46 which is located very close to the disc 47 so that the apparatus of the invention can very easily withstand-tremendous forces applied to the tool 20 with the relatively small motor 43.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of tool driving apparatus diflfering from the type described above.

While the invention has been illustrated and described as embodied in apparatus for driving a tool for a predetermined stroke, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and,therefore,suchadaptations should and are intended to be comprehended within the meaning and range of equivalence of the forming claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. Apparatus for driving a tool through a predetermined stroke, comprising, in combination, support means; tool carrying means mounted on said support means for movement through a predetermined stroke; drive means mounted on said support means for driving said tool carrying means through said predetermined stroke; transmission means for releasably interconnecting said tool carrying means with said drive means to transmit a drive from said drive means to said tool carrying means to drive the latter through said predetermined stroke; connecting means interconnecting said transmission means with said tool carrying means for movement between a rest position out of engagement with said drive means and an operating position in engagement with said drive means, said connecting means including a resilient member which becomes compressed when a tool carried by said tool carrying means encounters a resistance; moving means mounted on said support means and being located adjacent said transmission means for moving the latter from said rest to said operating position thereof; and disengaging means located on said support means for automatically disengaging said transmission means from said drive means after said tool carrying means has been driven through said predetermined stroke.

2. Apparatus as defined in claim 1 and wherein said transmission means includes an elongated member having a hooked end, said drive means includes a rotating disc having a pin which engages said hooked end of said elongated member of said transmission means when said transmission means is in said operating position thereof, and wherein said disengaging means is formed by a shaft which carries said disc and which disengages said hooked end of said member from said pin when said disc has turned through a predetermined angle.

3. Apparatus for driving a tool through a predetermined stroke, comprising, in combination, a supporting frame; an elongated tool carrying member mounted on said supporting frame for movement through a predetermined stroke; elongated transmission means having opposite end portions one of which is pivotally connected to said tool carrying member so that said elongated transmission means is turnable between a rest position and an operating position, and said elongated transmission means having a free hooked end portion distant from said tool carrying member; a drive shaft turnably mounted on said supporting frame for rotation about its axis and being located adjacent said free hooked end portion of said elongated transmission means; a disc fixed to said drive shaft for rotation therewith and being located in a plane parallel to that in which said transmission means turns during movement between said rest and operating positions thereof; a pin fixed to said disc, extending in a direction parallel to said drive shaft, and being turnable through a predetermined circular path spaced from said hooked end portion of said transmission means when the latter is in said rest position, and intersecting said hooked end portion of said transmission means when the latter is in said operating position thereof so that said pin engages said hooked end portion of said transmission means and moves the latter to drive said tool carrying member through said stroke thereof when said transmission means is in said operating position thereof and said drive shaft turns about its axis, said drive shaft engaging said transmission means at said hooked end portion thereof to disengage the latter from said pin after movement of said transmission means and said tool carrying member therewith through a predetermined distance corersponding to said stroke of said tool carrying member; spring means connected to said transmission means and said supporting frame for urging said transmission means to said rest position thereof; and moving means mounted on said supporting frame for moving said transmission means from said rest to said operating position thereof.

4. Apparatus for driving a tool through a predetermined stroke, comprising, in combination, a supporting frame; an elongated tool carrying member mounted on said supporting frame for movement through a predetermined stroke; elongated transmission means having opposite end portions one of which is pivotally connected to said tool carrying member so that said elongated transmission means is turnable between a rest position and an operating position, and said elongated transmission means having a free hooked end portion distant from said tool carrying member; a drive shaft turn'ably mounted on said supporting frame for rotation about its axis and being located adjacent said free hooked end portion of said elongated transmission means; a disc fixed to said drive shaft for rotation therewith and being located in a plane parallel to that in which said transmission means turns during movement between said rest and operating positions thereof; a pin fixed to said disc, extending in a direction parallel to said drive shaft, and being turnable through a predetermined circular path spaced from said hooked end portion of said transmission means when the latter is in said rest position, and intersecting said hooked end portion of said transmission means when the latter is in said operating position thereof so that said pin engages said hooked end portion of said transmission means and moves the latter to drive said tool carrying member through said stroke thereof when said transmission means is in said operating position thereof and said drive shaft turns about its axis, said drive shaft engaging said transmission means at said hooked end portion thereof to disengage the latter from said pin after movement of said transmission means and said tool carrying member therewith through a predetermined distance corresponding to said stroke of said tool carrying member; spring means connected to said transmission means and said supporting frame for urging said transmission means to said rest position thereof; and moving means mounted on said supporting frame for moving said transmission means from said rest to said operating position thereof, said moving means comprising an elongated member mounted on said supporting frame for reciprocating'movement along a path different from that through which said transmission means moves when engaged by said pin and said elongated member of said moving means also having a free hooked end portion, and said moving means comprising a second pin fixed to said transmission means and located in the path of movement of said hooked end portion of said elongated moving member to be engaged by the latter for moving said transmission means against the action of said spring means from said rest to said operating position thereof, said second pin moving away from said elongated member of said moving means upon engagement of said transmission means with said pin fixed to said disc.

5. Apparatus for driving a tool through a predetermined stroke, comprising, in combination, a supporting frame; an elongated tool carrying member mounted on said supporting frame for movement through a predetermined stroke; elongated transmission means having opposite end portions one of which is pivotally connected to said tool carrying member so that said elongated transmission means is turnable between a rest position and an operating position, and said elongated transmission means haping a free hooked end portion distant from said tool carrying member; a drive shaft turnably mounted on said supporting frame for rotation about its axis and being located adjacent said free hooked end portion of said elongated transmission means; a disc fixed to said drive shaft for rotation therewith and being located in a plane parallel to that in which said transmission means turns during movement between said rest and operating positions thereof; a pin fixed to said disc, extending in a direction parallel to said drive shaft, and being turnable through a predetermined circular path spaced from said hookedlend portion of said transmission means when the latter is in said rest position, and intersecting'said hooked end portion of'said transmission means when the latter is in said operating position thereof so that said pin engages Said hooked end portion of said transmission means and moves the latter to drive said tool carrying member through said stroke thereof whensaid transmission means is in said operating position thereof and said drive shaft turns about its axis, said drive shaft engaging said transmission means at said hooked end portion thereof to disengage the latter from said pin after movement of said transmission means and said tool carrying member therewith through a predetermined distance corresponding to said stroke of said tool carrying member; spring means connected to said transmission means and said supporting frame for urging said transmission means to said rest position thereof; and moving means mounted on said supporting frame for moving said transmission means from said rest to said operating position thereof, said moving means comprising an elongated member mounted on said supporting frame for reciprocating movement along a path different from that through which said transmission means moves when engaged by said pin and said elongated member of said moving means also having a free hooked end portion, and said moving means comprising a second pin fixed to said transmission means and located in the path of movement of said hooked end portion of said elongated moving member to be engaged by the latter for moving said transmission means against the action of said spring means from said rest to said operating position thereof, said second pin moving away from said elongated member of said moving means upon engagement of said transmission means with said pin fixed to said disc, and said moving means including a second spring means connected to said frame for urging said hooked end of said moving member to an idle position out of engagement with said second pin.

6. Apparatus for driving a tool through a predetermined stroke, comprising, in combination, a supporting frame; an elongated tool carrying member mounted on said supporting frame for movement through a predetermined stroke; elongated transmission means having opposite end portions one of which is pivotally connected to said tool carrying member so that said elongated transmission means is turnable between a rest position and an operating position, and said elongated transmission means having a free hooked endportion distant from said tool carrying member; a drive shaft tumably mounted on said supporting frame for rotation about its axis and being located adjacent said free hooked end portion of said elongated transmission means; a disc fixed to said drive shaft for rotation therewith and being located in a plane parallel to that in which said transmission means turns during movement between said rest and operating positions thereof; a pin fixed to said disc, extending in a direction parallel to said drive shaft. and being turnable through a predetermined circular path spaced from said hooked end portion of said transmission means when the latter is in said rest position, and intersecting said hooked end portion of said transmission means when the latter is in said operating position thereof so that said pin engages said hooked end portion of said transmission means and moves the latter to drive said tool carrying member through said stroke thereof when said transmission means is in said operating position thereof and said drive shaft turns about its axis, said drive shaft engaging said transmission means at said hooked end portion thereof to disengage the latter from said pin after movement of said transmission means and said tool carrying member therewith through a predetermined distance corresponding to said stroke of said tool carrying member; spring means connected to said transmission means and said supporting frame for urging said transmission means to said rest position thereof; and moving means mounted on said supporting frame for moving said transmission means from said rest to said operating position thereof,

said moving means comprising an elongated member mounted on said supporting frame for reciprocating movement alonga path different from that through which said transmission means moves when engaged by said pin and said elongated member of said moving means also having a free hooked end portion, and said moving means comprising a second pin fixed to said transmission means and located in the path of movement of said hooked end portion of said elongated moving member to be,

engaged by the iatter for moving said transmission means against the action of said spring means from said rest to said operating position thereof, said second pin moving away from said elongated member of said moving means upon engagement of said transmissionmeans, with said pin fixed to said disc, and said moving means, including a second spring means connected to said frame,

for urging said hooked end of said moving member to an idle position out of engagement with said second pin, said moving means also including a foot pedal pivotally mounted on said supporting frame and being connected to said elongated moving member for moving the latter against the action of said second spring means into engagement with said second pin to move said transmission means against the action of said first spring means from said rest to said operating position thereof.

7. Apparatus for driving a tool through a predetermined stroke, comprising, in combination, a supporting frame; an elongated tool carrying member mounted on said supporting frame for movement through a predetermined stroke; elongated transmission means having opposite end portions one of which is pivotally connected to said tool carrying member so that said elongated transmission means is turnable between a rest position and an operating position, and said elongated transmission means having a free hooked end portion distant from said tool carrying member, said one end portion of said transmission means being formed with a slot passing therethrough and said transmission means being connected to said tool carrying member through the medium of a pivot passing through said tool carrying member and said slot; a drive shaft turnably mounted on said supporting frame for rotation about its axis and being located adjacent said free hooked end portion of said elongated transmission means; a disc fixed to said drive shaft for rotation therewith and being located in a plane parallel to that in which said transmission means turns during movement between said rest and operating positions thereof; a pin fixed to said disc, extending in a direction parallel to said drive shaft, and being turnable through a predetermined circular path spaced from said hooked end portion of said transmission means when the latter is in said rest position, and intersecting said hooked end portion of said transmission means when the latter is in said operating position thereof so that said pin engages said hooked end portion of said transmission means and moves the latter to drive said tool carrying member through said stroke thereof when said transmission means is in said operating position thereof and said drive shaft turns about its axis, said drive shaft engaging said transmission means at said hooked end portion thereof to disengage the latter from said pin after movement of said transmission means and said tool carrying member therewith through a predetermined distance corresponding to said stroke of said tool carrying member; spring means connected to said transmission means and said supporting frame for urging said transmission means to said rest position thereof; moving means mounted on said supporting frame for moving said transmission means from said rest to said operating position thereof; and second spring means mounted on said one end portion of said transmission means and engaging said tool carrying member to urge said pivot to one end of said slot so that when a tool carried by said tool carrying member encounters a resistance,

said second spring means will be compressed till said pivot engages the opposite end of said slot before said transmission means moves said tool carrying member through said predetermined stroke.

8. In an apparatus for driving a tool through a predetermined stroke, in combination, support means; a drive shaft mounted for rotation about its axis on said support means; a plate fixed to said shaft for rotation therewith; a pin fixed to said plate for rotation therewith so as to turn through a predetermined circle located about said axis; and a transmission member having a hooked end and being mounted on said support means for movement at said hooked end thereof into and out of the path of movement of said pin and for movement into engagement with said shaft, so that when said hooked end of said transmission member is located in said path, said pin will engage said transmission member to move the latter toward said shaft during turning of said plate about said axis, said shaft engaging said transmission member to automatically disengage the same from said pin.

9. In an apparatus for driving a tool through a pre determined stroke, in combination, support means; a drive shaft mounted for rotation about its axis on said support means; a disc fixed to said shaft for rotation therewith, said shaft extending from at least one face of said disc; a pair of pins fixed to said disc for rotation therewith, being spaced about said axis, and extending from said face of said disc and at the same radial distance from said axis so as to turn through a predetermined circle located about said axis; a transmission member having a hooked end land being mounted on said support means for movement at said hooked end thereof into and out of the path of movement of said pins and for movement into engagement with said shaft, so that when said hooked end of said transmission member is located in said path, one of said pins will engage said transmission member to move the latter during turning of said disc about said axis, said shaft engaging said transmission member to automatically disengage the same from said pin; and moving means operable at the will of the operator for moving said transmission member into and out of said path of movement of said pins.

10. In an apparatus for driving a tool through a predetermined stroke, in combination, support means; a drive shaft mounted for rotation about its axis on said support means; a plate fixed to said shaft for rotation therewith; a pin fixed to said plate for rotation therewith so as to turn through a predetermined circle located about said axis; la transmission member having a hooked end and being mounted on said support means for movement at said hooked end thereof into and out of the path of movement of said pin and for movement into engagement with said shaft, so that when said hooked end of said transmission member is located in said plath, said pin will engage said transmission member to move the latter toward said shaft during turning of said plate about said axis, said shaft engaging said transmisson member to automatically disengage the same from said pin; and moving means operable at the will of the operator for moving said transmission member into land out of said path of movement of said pin.

References Cited in the file of this patent UNITED STATES PATENTS 610,129 Ericson Aug. 30, 1898 1,114,044 Roberts Oct. 20, 1914 1,337,533 Trumble Apr. 20, 1920 2,382,174 Rott Aug. 14, 1945

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