US2040885A - Fastening-inserting machine - Google Patents

Description

May 19, 1936.

J. F. STANDISH FASTENING INSERTING MACHINE Filed Nov. 13, 1933 3 Sheets-Sheet l May 19, 1936.

JQF. STANDISH FASTENING INSERTING MACHINE Filed Nov. 15, 1955 3 Sheets-Sheet 2 y 1936- J. F. STANDISH I 2,040,885 FASTENING INSERTING MACHINE Filed NOV. 13, 1955 3 Sheets-Sheet 5 bwm' Patented May 19, 1936 UNITED STATES PATENT OFFICE FASTENING-INSERTING MACHINE Application November 13, 1933, Serial No. 697,781

30 Claims.

My invention relates to machines by which nails or other fastenings are inserted in the work, it being herein disclosed in connection with apparatus for attaching heels to shoes by nails driven from within said shoes.

An object of this invention is to effect the secure retention of the work upon its support during the driving of the fastenings, this being by relatively simple means not subject to change of the retaining action in use. of work-clamping pressure through a hydraulic connecting device I have found to best meet these requirements, and I interpose between movable pressing means contacting with the work and movable actuating means therefor, a liquid-containing cylinder movable with one of said means, and a piston operating in the cylinder and movable with the other means,,while a valve carried by a mounting held against movement during the normal operation of the machine controls the operating relation between the cylinder and piston, as by governing the fiow of the liquid through a passage in the piston. While the valve is open, the work-contacting means may be moved by the 'operator independently of the actuating means. By closure of the valve, the cylinder and piston will be locked together by a substantially noncompressible agent to communicate pressure from the actuating means to the work-contacting means. Because of the freedom of the valvemounting from normal movement, its position may readily be varied topermit change in the time of closure of the valve in the operating cycle and therefore the amount of pressure applied to the work. The valve is shown as yieldable upon its mounting to allow movement of the associated elements of the connecting device if the valve has closed the passage. While I have herein shown the cylinder more directly connected to the work-clamping means and the piston under. the influence of the actuating means, it is to be understood that this relation may be reversed without departing from the spirit of my inven tion. In the preferred form of the invention,

' the frame of the machine, upon which is mounted a work-supporting jack, is provided with vertical ways in which a slide is movable and carries both a pressure-abutment co-operating with the jack and the cylinder of the connecting device. The piston of the connecting device is movable in the cylinder and is provided with a passage, the flow through which is governed by the valve. Preferably, the piston is mounted upon a second slide guided in the ways, and the valve is carried by a support fixed to the frame. As illustrated, a spring elevates each slide and there is also a spring interposed between the support and valve. This valve in the present instance has a stem, and the support for the stem is normally fixed against rotation upon the machine-frame, the

The transmission valve spring being interposed between the valvestem and the support. The support is preferably furnished by a sleeve threaded externally and engaged by a nut movable upon the frame. Rotation of the nut alters the normal position of the Valve, as will also rotation of the sleeve. Regardless of the specific construction of the valve and its co-operating elements, I preferably furnish a member movable to adjust the normal position of said valve and means for adjusting the valve independently of the positioning member. By the member, the valve may be caused to assume positions between definite extremes, while the independent movement of the valve may change such extremes simultaneously. There is thus furnished a normal range of adjustment which will lead to the application to the work of pressure between a minimum and a maximum. and if this causes operating troubles both limits may be changed to the same extent.

A further object of the invention is to reduce the shock of stopping the pressure-abutment when it is withdrawn from the work. This I effect by means so located that it will not be liable to mutilation by fastenings and the like gathering upon it, which means is preferably variable in position to determine the extent of withdrawing movement of the abutment.

In the accompanying drawings,

Fig. 1 illustrates my invention in partial broken side-elevation as applied to a heel-attaching machine;

Fig. 2 is a section on the line IIII of Fig. 1;

Fig. 3, a front elevation of the jack and. nailing mechanism;

Fig. 4, a section on the line IVIV of Fig. 2; and

Fig. 5, an enlarged sectional detail on. the line V-V of Fig. 2.

At the front of a column it], which furnishes the chief portion of the frame in the illustrated machine, is mounted upon a bracket l2 a jackpost l4. .Within the jack a plunger I6 is arranged to reciprocate, this plunger carrying upwardly extending drivers I 8 for nails or other fastenings, which are supported for insertion upon the upper extremities of the drivers within openings in the jack-top. The plunger may be elevated for the insertion of the nails by a cam contacting with a roll 22 movable upon the lower extremity of said plunger. The cam is fast upon the forward end of a shaft 24 journaled horizontally in the frame and receiving power through gearing 26. A spring 28, inserted between a block 30 surrounding and bearing upon the shaft and a downward extension 32 of the plunger, serves to lower said plunger and the drivers. The block is retained against displacement along the shaft bythe cam on one side, and on the other side by a washer and a screw 33 threaded into the forward end of the shaft. The spring is prefer- "ably seated in a cup'34, which is, in effect, a

portion of the plunger-extension. This Clip, however, is preferably threaded upon a lower cylindrical end 36 of theextension, so by turning it up or down the force exerted by the spring may be varied. The cup is divided verticallyto enable itto be locked in its adjustedpositionby a clamping screw 38. Engagement'between the block and the plunger-extension both prevents rotation of the block and guides the-plunger.

'In the frame are parallel vertical ways40; 46 in which a slide 42 is arranged to move. At 44' therslide extends over the jack I4 and. carries a pressure head or abutment 46 provided with' members 43; which" contact with a. heeluponithe heel-seat ofga' jacked shoe to retain said heel in place while the attaching nails are beingdriven. The head ishel'd normally raised to permit the jacking'of the work, by a tension-spring, 50 attached at its lower extremity to the-frame and at its upper to a lever 52 fulcrumed .upon' the frame 7 andipivoted at 53to-the'slide-42.' The extentof upward movement of the headirnay -beadjustably; limitedby'a bumper, themovable elementofwhich is furnished by a threaded rod 'fi-lpassingloosely through avertical opening in. a projection 56 from the top of theslide 42 andusupported by a'nut.58 carried by-the'threaded portion and resting upon the upper face of "the'projection.

'The rodextends' down' through an openingyin a projection62 from the frame andz'has a headbetween which and'the bottom of saidv projection are interposed washers 76.4; of leatheror other yieldable material, which cushion the-shock as the spring 50 elevatesrthe sliderand head. "The point at which the head stops may lee-determined? by varying. the position of the nut 58 upon the' rod.v It will-be seen that this bumper is removed from all operating; elements, being so situatedi that nails can not gather upon the cushion to 65 this extension is retained a block 84 bearing upon cause it to be cut and thus destroyed;- The members 48 are broughtinto preliminary or :meas- 'uring contact withthe work as'theresult of the depression of a treadle 66 by theoperator. This action is caused to .lowerithee slide andthead through a rod 68 joining the treadle to the slide. Engagement of'themenibers 48'iwith .the work having-been established; final-clamping pressure 7 is to be'applied in preparation for-z'the driving;

of: ithe attachingnailsa V s ,7

Joining opposite sides of the slide 42 at its lower portion1is arearwardly'extendingireinforcing yoke I0, and opposite the yoke rods 12' 'secure'to the V1 slide a vertical cylinder I4. This cylinder is closed at its lower end and at its upper is open to admit a tubular-piston IS. ,The piston depends from a slide I8 located at the rear of the cylinder, between it and the yoke 10, and guided for vertical movement by projections entering the ways 40.

The contact of the piston with the interior. or the cylinder may be depended upon to guide the upper portion of the slide I8. An extension 82 of this slide surrounds the shaft 24 and within the'shaft. A compression-spring 86, interposed between the block and a projection 88 from the slide I8, urges the piston up and maintains 6011-1 tact of a roll 90 rotatable upon the bottom of the "extension 82 with a cam 92 fast upon the shaft 24, this cam being the element which actuatesthe slide 42 to place clamping pressure upon the work. The piston, it will be noted, is yield- .ably supported upon the shaft 24. 7

Contained in the cylinder and in the tubular piston is such a liquid as oil, indicated at L in Fig. 1 of the drawings. With the lower end of the piston open there may be relative movement between said cylinder and piston, so the operator may freely lower the head 46 by the treadle-rod EE-to produce contact of the members 48 with the work. If thepiston-opening be closed, the retention of the substantially incompressible liquid against flow locks the cylinder and piston to-' gether, so the effect of the cam 92 may be communicatedthrough these elements to the head to clamp the work upon the'jack for the driving- 7 of the nails. The control for this purpose is best Across the obtained in the following manner. front of-the frame [0,. just above the' cylinder, -is secureda bridge-bar I00 upon the upper'face of which a nut I02 (Fig.5) ismounted to turn;

It is shown as held seated in a recess in thebar by a plate I04 attached to said bar-by screws I06, I06, separated from each other transversely of the frame near the front of the bar. To facilitate the-turning of the nut, a finger-piece I08 extends forwardly'therefrom, contact of this fingerpiece with the spaced heads of the screws I06 defi.-' nitely limiting the extent. of angular movement.

To hold the nut temporarily in the position which it may be turned by the operator, a spring-detent I-I0 engagesa toothed surface of the rear of the nut. The thread of the nut receives the threaded exterior of a sleeve II2, which is allowed tomove vertically, but is-held against rotation by a projecting finger II3 split. and. clamped upon the sleeve by a screw II4 (Fig. 2)- and extending into:

Passing.

a vertical groove II6 in the bar I00. through thesleeve is a rod II8 carrying upon its lower extremity, within the cylinder I4, atballs;

valvel20 co-operating with a seat about the open end'of the pistonv I61 Surrounding the rod I I8' andrlocated in a counterbore in the sleeve H2 is a spring I22, seated at its lower end upon-the bottom of the counterboreand acting at its upper end against a nut and check-nut I24 .threaded upon the upper extremity of therods The spring holds the ballI20 normally raised but capableof being lowered by engagement of the piston with it. Upward movement ofthe valve'is limited by contact with. a circular plate I26 resting upon a shoulder I28 on the rodand forced by the spring- I22 against the end of thesleevet The plate acts as a bafile-to' prevent the-oil from being thrown out of the opening at the upperportion ofthe piston. Rotation of the nut I02 by its fingerpiece will, because of the threaded engagement,v

raiseor lower the sleeve H2 and correspondingly alter the initial separationbetween thevalve and its seat upon the piston. This will, between limits fixed by contact of the finger-piece withithe. screws I06, change the time in the cycle at which the cylinder and piston are locked together; and the degreeof final pressure applied to thework. By loosening the clamping screw I I4 the; sleeve may be freed from the finger H3 and raised or lowered,. with the valve, while the nut remains at rest. By this means the entire range of valve-- adjustment may beincreased -or decreased, the

finger being again fixed upon the sleeveafter the desired changehas been made.

To produce an operating cycle of the machine;

power is applied to the shaft 24 through the gearing 26 anda. single-rotation clutch governed by a connection at I32 to the rear of the treadle 66.

This connection furnishes the fulcrum about which the treadleis lowered during the applic tion of preliminary pressurethrough the rod 63,

The fulcrum is transferred to the articulation between this rod and the treadle, after the members 48 have contacted with the jackedwork and resistance to elevation of the connection I32 by a spring I34 is overcome.

Considering the general operation of the machine, the elements at the beginning of a cycle are related as illustrated in Fig. 1, the drivers I8 being lowered by the spring 28 and the head 46 and cylinder I4 elevated by the spring 50. The piston I6 and the ball-valve I20 are also held normally at their highest points by the springs 86 and I22, respectively, they being so positioned that the passage through the piston is open. The operator places nails N, points up, in the driverpassages, jacks a shoe S and applies a heel H to its heel-seat; he then depresses the treadle 66, and through the rod 68 lowers the slide 42 and head 46 to bring the members 48 into engagement with the heel. The cylinder descends with the slide, the contained liquid flowing past the open valve. Having assured himself that the Work is correctly placed, the operator continues the depression of the treadle. The transfer of the fulcrum-point trips the clutch through the connection I32, and the power-operation of the machine begins. The cam 92 quickly lowers the slide I8 and the piston 16 until the opening through the latter is closed by the waiting valve I20. Since the liquid can not any longer pass between the piston and cylinder, these are compelled to travel down together under the influence of the cam 92, the spring I 22 yielding so the piston may carry the ball with it. The slide 42 and head 46 therefor descend and apply clamping pressure to the work to a degree determined by the contour of the cam 92. The plunger I6 and the drivers I8 are then elevated by the cam 20, and the nails inserted through the heel-seat of the shoe into the heel to effect the attachment. The cycle is completed by the return of all the elements to their initial positions by their springs as permitted by the cams, and the heeled shoe may be removed from the jack. If it is found that the final or machine-pressure is insufficient to hold the work against the displacing force of the drivers, the initial position of the valve I20 may be very conveniently altered by anticlockwise rotation, as viewed from above, of the nut I02 through the finger-piece I08, it being raised so the piston-passage will be closed earlier in the cycle. On the other hand, if the pressure is excessive, tending to break heels or to deform their covering, the nut is rotated in the opposite direction to lower the valve, causing its closure later in the cycle. There is thus introduced more or less lost motion before the locking of the cylinder and piston together occurs to begin the application of final pressure. Some operators may tend to err in one direction or the other, tending to produce either a gapping crease or splitting heels. In this case, the entire range of adjustment by the finger-piece I08 may be altered to prevent such defects. In the first instance, the sleeve H2 is raised to bring the valve closer to the piston and in the second it will be lowered therefrom, in each case the maximum and minimum pressure being changed correspondingly. This may be done by a service-man through adjustment of the sleeve.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a fastening-inserting machine, movable work-pressing means, movable actuating means therefor, -a liquid-containing cylinder movable with one of said means, a piston operating in the cylinder and movable with the other means, a valve for controlling the operating relation between the cylinder and piston, and a mounting for said valve held against movement during the normal operation of the machine.

2. In a fastening-inserting machine, movable work-pressing means, movable actuating means therefor, a liquid-containing cylinder movable with one of said means, a piston operating in the cylinder and movable with the other means, a valve for controlling the operating relation between the cylinder and piston, amounting for said valve held against movement during the normal operation of the machine, and means arranged to vary the position of the valve upon the mounting. r

3. In a fastening-inserting machine, movable work-pressing means, movable actuating means therefor, a liquid-containing cylinder movable with one of said means, a piston operating in the cylinder and movable with the other means, there being a passage in the piston through which the liquid may flow, a valve for controlling the flow of liquid through the passage, a mounting for said valve held against movement during the normal operation of the machine, means arranged to vary the position of the valve'upon the mounting, and means arranged to vary the position of the mounting.

4. In a fastening-inserting machine, movable work-pressing means, movable actuating means therefor, a liquid-containing cylinder movable with one of said means, a piston operating in the cylinder and movable with the other means, there being a passage in the piston through which the liquid may flow, a valve for controlling the flow of liquid through the passage, a mounting for said valve held against movement during the normal operation of the machine, and means permitting the valve to yield upon its mounting during such operation.

5. In a fastening-inserting machine, movable work-pressing means, movable actuating means therefor, a liquid-containing cylinder movable with one of said means, a piston operating in the cylinder and movable with the other means, there being a passage in the piston through which the liquid may flow, a valve for controlling the flow of liquid through the passage, a mounting for said valve held against movement during the normal operation of the machine, means arranged to vary the position of the valve upon the mounting, and

yieldable means interposed between the valve and the position-varying means.

6. In combination, a frame provided with spaced vertical ways, a work-supporting jack mounted upon the frame, a slide guided in the ways, a work-pressing abutment carried by the slide, a cylinder mounted upon the slide between the ways at the rear of the jack, a piston movable in the cylinder and provided with a passage, a valve for controlling the passage, and means for moving the cylinder and piston.

7. In combination, a frame provided with spaced vertical ways, a work-supporting jack mounted upon the frame, a slide guided in the ways, a work-pressing abutment carried by the slide, a cylinder mounted upon the slide, a second slide guided in the ways, a piston mounted upon the second slide and extending into the cylinder, said piston being provided with a passage, a valve for controlling the passage, and means for moving the cylinder and piston together.

8. In combination, a frame provided with spaced vertical ways, a work-supporting jack mounted upon the frame, a slide guided in the ways, a work-pressing abutment. carried by the vslide, a cylinder mounted upon the slide, a sec- 0nd slide guided inthe ways, a piston mounted upon the second slide and extending into the cylln'der, said piston being provided with a passage,

a, supp0rt fixed to the frame, a valve mounted upon the support to control the passage, and

means for moving the piston.

valve for controlling the flow through the passage, and means for moving one of the slides, said moving means also supporting the slide. 10. In combination, a frame provided with 'spaced vertical ways, a work-supporting jack mounted upon the frame, a slide guided in the ways, a work-pressing abutment carried by the slide, a cylinder mounted'upon the slide between the ways at the rear of the jack, a second slide guided in the ways, a piston mounted upon the second slide'and extending into the cylinder, said piston being provided with a passage, a valve for controlling the flow through the passage, a

spring for elevating each slide, and means for moving one of the slides. 7

'11. In combination, a frame provided with spaced vertical ways, a work-supporting jack mounted upon the frame, a slide guided in the ways, a work-pressing abutment carried by the slide, a cylinder mounted upon the slide between the Ways at the rear of the jack, a second slide guided in the ways, a piston mounted upon the second slide and extending into the cylinder, said piston being provided with a passage, a support fixed to the frame, a valve mounted upon the support to control the passage, a spring interposed between the support and valve, and means for moving the piston.

12. Incombination, 'a frame, a work-pressing abutment movable thereon, a cylinder connected to the abutment, an actuating shaft rotatable in the frame, a member bearing upon the shaft,

and a piston movable by the shaft and supported by the member.

13.. In. combination, a frame, a work-pressing abutment movable thereon, a cylinder connected to the abutment, an actuating shaft rotatable in the frame, a member bearing upon the shaft, a piston movable by the shaft, and a spring supported by the ,member and acting upon the piston.

'14. In a heel-attaching machine, a frame pro- .vided with spaced vertical ways, a jack rising therefrom, nail-drivers operating in the jack, a shaft journaled' horizontally in the frame, means carried by the shaft for actuating the drivers, a slide movable in the ways, a pressure-head carried by the slide and co-operating with the jack, a cylinder mounted-upon the slide at the rear of the jack and being closed at the bottom, a second slide movable in the ways and extending above the cylinder, 2. tubular-piston depending from the second slide into the cylinder, a valvecontrolling the passage through the piston, and a cam rotatable by the shaft and acting up'on the piston-slide.

15. In a heel-attaching machine, a frame pro- 7 vided with spaced vertical ways, .a jack rising therefrom, nail-drivers operating in the 'jack, a

shaft journaled horizontally in the frame, means carried by the shaft for actuating thev drivers, a slide movable in the ways, a pressure-head carried by the slide and co-operating with the jack, a cylinder mounted upon the slide at the rear of the jack and being closed at the bottom, a second slide movable in the ways and extending above the cylinder, a tubular piston depending from the second slide into the cylinder, a bridge extending between the ways, a valve controlling the passage through the piston and having a stem extending above the bridge, means co-operating with the stem for supporting the valve upon the bridge, and a cam rotatable by the shaft and acting upon the piston-slide.

16. In a heel-attaching machine, a frame provided with spaced vertical ways, a jack rising therefrom, nail-drivers operating in the jack, a'

shaft J'ournaled horizontally in the frame, means carried by the shaft for actuating the drivers, a slide movable in the ways, a pressure-head carried by the slide and co-operating with the jack, a'cylinder mounted upon the slide at the rear of the jack and being closed at the bottom,

a second slide movable in the ways an'dextending above the cylinder, a tubular piston depend ing from the second slide into the cylinder, a bridge extending between the ways, a valve controlling the passage through the piston and hav-' ing a stem extending above the bridge, means inried by the slide and co-operating with the jack,

a cylinder mounted upon the slide at the rear of the jack and being closed at the bottom, a second slide movable in the ways and, extending above the cylinder, a tubular piston depending from 4 the second slide into the cylinder, a bridge extending between the ways, a valve controlling the passage through the piston and having a stem extending above the bridge, means cooperating with the stem for supporting the valve upon the bridge, means arranged to raise and lower the supporting means, and a cam rotatable by the shaft and acting upon the piston-slide.

18. In a heel-attaching machine, a frame provided with spaced vertical waysya jack. rising therefrom, nail-drivers operating in the jack, a-

shaft journaled horizontally in the frame, means carried by the shaft for actuating the drivers, a slide movable in the ways, a pressure-head carried by the slide and co-operating with the jack,

a cylinder mounted upon the slide at the rear of the jack and. beingclosed at the bottom, a second slide movable in the ways and extending above the cylinder, a tubular piston depending 7 from the second slide into the cylinder, a valve 7 controlling the passage through the piston, a cam rotatable by the shaft and acting upon the pistonslide, and a block bearing upon the shaft and by which the piston-slide is supported.

19. In a heel-attaching machine, a frame pro-.

vided with spaced vertical ways, a jack rising therefrom, nail-drivers operating in the jack, a shaft journaled horizontally in the frame, means carried by the shaft for actuating the drivers, a slide movable in the ways, a pressure-head carried by the slide and co-operating with the jack, a cylinder mounted upon the slide at the rear of the jack and being closed at the bottom, a

second slide movable in the ways and extending above the cylinder, a tubular piston depending from the second slide into the cylinder, a valve controlling the passage through the piston, a cam rotatable by the shaft and acting upon the pistonslide, a block bearing upon the shaft and by which the piston-slide is supported, and a spring interposed between the block and piston-slide.

20. In a heel-attaching machine, a frame provided with spaced vertical ways, a jack rising therefrom, nail-drivers operating in the jack, a shaft journaled horizontally in the frame, means carried by the shaft for actuating the drivers, a slide movable in the ways, a pressure-head carried by the slide and co-operating with the jack, a cylinder mounted upon the slide at the rear of the jack and being closed at the bottom, a second slide movable in the ways and extending above the cylinder, a tubular piston depending from the second slide into the cylinder, a valve controlling the passage through the piston, a cam rotatable by the shaft, a roll rotatable on the piston-slide and contacting with the under side of the cam, a block surrounding the shaft, and a spring contacting with the block and piston-slide above the shaft.

21. In a fastening-inserting machine, a movable work-pressing member, actuating means therefor, connections including an hydraulic device between the pressing member and its actuating means, said hydraulic device being provided with a valve, a member movable to adjust the normal position of the valve, and means for adjusting the normal position of the valve independently of such positioning member and prior to the operation of the machine.

22. In a fastening-inserting machine, a movable work-pressing member, actuating means therefor, connections including an hydraulic device between the pressing member and its actuating means, said hydraulic device being provided with a valve, a member movable to change the normal position of the valvebetween definite extremes, and means arranged to move the valve to change such extreme positions simultaneously.

23. In a fastening-inserting machine, a frame, a work-pressing member movable thereon, actuating means for the work-pressing member, connections including an hydraulic device between the pressing member and its actuating means, said hydraulic device being provided with a valve having a stem, and a support for the valve-stem fixed upon the frame against movement by elements of the machine.

24. In a fastening-inserting machine, a frame, a work-pressing member movable thereon, actuating means for the work-pressing member, connections including an hydraulic device between the pressing member and its actuating means, said hydraulic device being provided with a valve having a stem, a support for the valve-stem fixed upon the frame against movement by elements of the machine, and a spring interposed between the valve-stem and support.

25. In a fastening-inserting machine, a frame, a work-pressing member movable thereon, actuating means for the work-pressing member, connections including an hydraulic device between the pressing member and its actuating means, said hydraulic device being provided with a valve having a stem, a sleeve surrounding and supporting the valve-stem, and means arranged to hold the sleeve in different positions upon the frame.

26. In a fastening-inserting machine, a frame, a work-pressing member movable thereon, actuating means for the work-pressing member, connections including an hydraulic device between the pressing member and its actuating means, said hydraulic device being provided with a valve having a stem, a sleeve surrounding and supporting the valve-stem, means arranged to hold the sleeve in different positions upon the frame, and a spring interposed between the valve-stem and the sleeve.

27. In a fastening-inserting machine, a frame,

a work-pressing member movable thereon, actuating means for the Work-pressing member, connections including an hydraulic device between the pressing member and its actuating means, said hydraulic device being provided with a valve having a stem, an externally threaded sleeve surrounding and supporting the valve-stem, and a nut movable upon the frame and engaging the sleeve-thread.

28. In a fastening-inserting machine, a frame,

a work-pressing member movable thereon, actuing-driving mechanism supported on the frame,

a. slide movable upon the frame and extending above the jack, said slide having an opening, a pressure-head movable by the slide toward and from the jack, means for elevating the slide and head, a rod extending through the openings, and a cushion interposed between the rod and the frame above a fastening-inserting mechanism.

30. In a fastening-inserting machine, a frame provided with an opening, a jack having fastening-driving mechanism supported on the frame, a slide movable upon the frame and extending above the jack, said slide having an opening, a pressure-head movable by the slide toward and from the jack, means for elevating the slide and head, a rod extending through the openings, a cushion interposed between the rod and the frame above a fastening-inserting mechanism, and means arranged to change the vertical position of the rod in the slide-opening.

JOHN F. STANDISH.

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