US2226798A - Heel building machine - Google Patents

Description

Dec. 31, 1940.

w. R. BAR CLAY ET AL 2,226,798

HEEL BUILDING MACHINE Filed March 7, 1939 4 Sheets-Sheet l I Fig.1

HEEL BUILDING MACHINE Filed March 7, 1939 4 Sheets-Sheet 2 Dec. 31, 1940. I w. R. BARCLAY ET AL HEEL BUILDING MACHINE Filed March 7, 1939 4 Sheets-Sheet 3 VEN TUR'S M02 (/5 LAM/6 Dec. 31, 1940.

w. R. BARCLAY- ET AL 2,226,798

HEEL BUILDING MACHINE Filed arch 7, 1959 4 Sheets-Sheet 4 //\I VENTURE /M K. 6% Wfi a A Patented Dec. 31, 1940 HEEL BUTLDING MACHINE Application March 7, 1939, Serial No. 260,356 In Great Britain March 17, 1938 Claims.

This invention relates to heel building machines of the type in which heel lifts are assembled in a mold and held under pressure while heel building nails are driven into them by 5 power operated nail drivers.

When high heels are being built, long nails must be used and these sometimes cause trouble by being deflected from straight lines while they r are being driven.

It is known that this trouble can be overcome by previously pricking holes in the assembled lifts, into which holes the heel building nails are driven. This preliminary pricking of the heels insures that the nails will be driven straight, regardless of the height of the heel.

It is an object of the present invention to provide a heel building machine in which is embodied a simple, easily controlled, pricking mechanism capable of use, when required, in connection with the heel building operation and, in its preferred form, capable of being rendered inoperative when it is not needed.

In the illustrated machine the pricking of the heel, prior to the nail driving operation, is provided'for by mounting both awls and nail drivers in a manually operable slide which is movable to bring either the awls or the drivers, alternatively, into an operating position in line with the heel assembling mold and between said mold and a 'power operated driving plunger. According to the invention a safety locking mechanism is provided for preventing the machine from being started when the slide is in such a position that neither the awls nor the drivers are in line with the mold, thus avoiding danger of breakage of the machine, which would certainly occur if the power were applied at'such times.

Damage would also occur if it were attempted to drive the awls into a heel after the nails had 40 been driven therein and another feature of the invention resides in the provision of locking mechanism for preventing the nail drivers from being operated before the awls are operated to prick the heel, that is to say, insuring that the machine can be operated only in the proper sequence.

Since low heels, which do not require preliminary pricking, can also be built in the same machine, provision is made for holding part of the above-mentioned locking mechanism in an alternative position so that the machine can be started only when the nail drivers are in line with the mold, in which case the awls are not used at all, and the machine functions as. an ordinary heelbuildingmachine, the heel building nails -being driven without previously pricking holes for their guidance.

These and other features and advantages of the invention will best be understood and appreciated from the following detailed description of 5 one embodiment thereof when read in connection with the accompanying drawings, in which Fig. 1 is a right-hand side elevational view of the illustrative machine; I

Fig. 2 is .a view, partly in section, on a vertical l0 plane extending from front to rear of the machine;

Figs. 3 to 6, inclusive, are side elevational views of various details of the operating and controlling mechanisms, and 15 Fig. 7 is a view partly in section on a vertical plane extending from side to side of the machine.

The illustrative machine is similar in general construction to that disclosed in United States 20 Letters Patent No. 2,046,443, granted July 7. 1936,.upon an application filed in the names of William R. Barclay, Reginald B. Woodcock, .and Wilfrid T.l/linett, and comprises a frame Ii, from the rear of whichextends upward a bracket I 3 and upon'the front of which is an upright post l5. The lower part I 1 of the post [5 has a central, vertical bore l9 extending therethrough (Fig. 7) while the upper part of the post consistsof two vertical wings, 2| at the left and 30 23 at the right, which are spaced apart and extend from front to rear of the machine.

Mounted for vertical sliding movement in the bore [9 is a cylindrical actuator plunger 25 carry-- ing at its lower end an upper cam roll 21 which co-operates with a cam 29 mounted on the front end of a driving shaft 3|, which extends from front to rear'of the machine and is carried by bearings'in the frame. A downward extension from the plunger 25carries a lower cam roll 33 which is positioned vertically below the cam roll 21 and co-operates with the cam 29 at a certain stage in the operation of the machine.

Upon the rear end of the driving shaft 3! is 45 loosely mounted a large pulley 35 which is continuously driven from any convenient source of power and may be coupled to the driving shaft 3|, when desired, by a single-revolution clutch controlled by a starting lever 31. my

When the machine is stopped, the plunger 25 is lowered and there is a gap between the cam roll 33- and the cam 29, the cam roll 2! being held down by the weight of the plunger and the assov ciated parts. When the: clutch is tripped, the 55 plunger is raised in the bore I9 .and then returned to its lowered position.

The lower part of the post I5 carries a shaft 39 which extends crosswise of the machine. Loosely pivoted on the shaft 39 is a hand lever 43 which extends forward from the shaft and has a hand piece 45 on its forward end. A fiat surface 4! on the lever 43 is adapted to engage beneath a pin 49 which is secured in the plunger 25 and protrudes through a slot in the righthand side of the lower part of the post I5. When the hand piece 45 is lifted, the plunger 25 will be lifted until it is stopped by the cam roll 33 coming into contact with the cam 29, thus permitting the operator to see whether or not the correct number of nails are in the nail block of the machine.

The plunger 25 has a forwardly and rearwardly extending diametrical slot at its upper end, in the two side walls of which are cut guideways each comprising an upper horizontal surface 53, a lower surface 55 and a vertical surface 51. The forward part 56 (see Fig. 2) of the said lower surface is at a lower level than the rearward part 58 thereof, the two parts being connected by a sloping intermediate part 69. When the plunger 25 is in its lowered position, as when the machine is at rest, the forward parts 56 of the lower guideway surfaces 55 are substantially level with the flat upper surface 59 of a table 6| extending forward from the lower part I! of the post I5 so that the table 6| constitutes in effect a forward continuation of the guideways in the plunger. A table 63 having a flat upper surface 65 also constitutes, in effect, a continuation of the rearward parts 58 of the lower guideway surfaces 55 in a rearward direction. Some distance above the surfaces 59, 65, there are formed in the wings 2 I, 23 guideways 6-! extending forwardly and rearwardly of the machine and sloping slightly downward toward the front of the machine.

Above the guideways 61, the opposing inner faces of the wings 2|, 23 extend upward to edges 69 which are parallel to the guideways 61. From its edge I59, each wing has a downwardly and outwardly extending surface II.

It will be apparent that between the opposing faces of the wings 2|, 23 of the post I5, a forwardly and rearwardly extending channel is presented. In this channel a rectangular slide I3 is mounted to move forward and rearward. Projecting from the sides of the slide I3 are ribs I5 which fit in the guideways 61 and above the ribs are inclined flanges I! which are arranged parallel to and just above the surfaces II of the wings.

The slide member 13 has two vertical bores 19, 8|; the bore I9 being the smaller of the two and being behind the bore 8|. In the body part of the slide member, the bores I9, 8| have continuous cylindrical surfaces but the slide member also has a depending part, the width of which is less than the diameter of the bore I9 and which is divided by the bores into three depending lugs 83, 85, 81. The arrangement is such that when the machine is at rest, the slide member I3 may slide forward and rearward in the channel between the wings 2|, 23. As the plunger 25 rises, parts, at least, of two of the lugs 83, 85, 81 are accommodated in recesses in the plunger 25. One of these recesses is indicated at 89 in Fig. 7.

Each of the bores 19, 8| in the slide member I3 is enlarged at its upper end to form an internal, circular ledge, as indicated at 90 and 9|, respectively. Fitted for sliding movement within the bore SI and normally resting upon the ledge 9| is a nail block 93 having integral with its top a small boss 95, whose horizontal cross section is substantially the same as that of the tread surface of a heel. Secured to the nail block and extending downward therefrom is a stem 91 termihating at its lower end in a head 99. The nail block 93 has a projection upon its periphery which fits slidably in a vertical groove in the bore 8| and prevents the nail block from turning but permits it to slide vertically. The stem 91 extends through a bore in a circular plate IOI to which are aihxed three nail drivers I03 which extend parallel to the stem 91 into holes drilled through the nail block 93.

The stem 9! also passes through a cylindrical, cup-shaped member I05 which is vertically slidable in the bore 8| and has a peripheral projection which fits slidably in a vertical groove in the bore 8| to prevent turning movement of the said member I05. The nail-driver plate IIII normally rests within the cup member I85 which has at its lower end two' laterally projecting ears I01. When the slide member I3 is in arearward position, as shown in Fig. 2,'these ears I01 aresituated on the lower guideway surfaces 55 in the plunger 25, so that when the plunger is lifted, for example, by lifting the nail-showing'hand lever 43, the member I85 is also lifted, together with the plate IIlI which normally rests on the bottom of the recess in the member I05.

Supported on the ledge 99 in the bore I9 in the slide member I3 is a cover plate I99 and beneath the ledge is a pricker plunger III which is vertically slidable in said bore. The plunger III has a spline |I3 which prevents turning movement, and carries three vertical awls II5 which have flat upper ends. At the lower end of the plunger I II are formed laterally projecting ears similar to the ears II" at the lower end of the member I 05.

Carried in a bearing in a casting II'I secured to the rear of the post I5 is a rockshaft I I9 which extends from side to side of the machine and has afiixed thereto an upwardly extending lever |2| connected to the rear of the slide member I3 by a short link I23. The link I23 is connected to the lever |2| by a pin I25 which may be readily withdrawn to permit the slide member I3 to be removed from the machine.

To the right-hand end of the shaft I I9 is aflixed a rocking lever I27, of which one arm I29 extends forward and another arm I3I extends rearward. Secured to the arm |3I is one end of a long tension spring I33, the other end of which is secured to a stationary part of the machine at a point near the floor. Pivoted to the arm I29 is a downwardly extending treadle rod I34, the lower end of which is connected to a treadle I35. The arrangement is such that depression of the treadle I causes the slide member I3 to be moved forward. The said slide member is returned rearward by the action of the spring I33 when the treadle is released. The forward position of the slide member I3 when the treadle is fully depressed is determined by a lug I31 which engages a stationary stop pin I38 mounted in the casting II'I; rearward movement of the slide I3 is limited by contact of the slide member with an adjlustable stop screw I40 carried by the bracket 3.

When the treadle is not depressed, the bore 8| in the slide I3 is substantially coaxial with the bore I9 in the post I5 andthe ears III! at the lower end of the member I95 are accommodated and the pricker plunger is above the plunger 25.

The machine comprises a pair of upright bars I39, one at each side of the machine, the upper ends of said bars being joined by a beam I II which supports a presser pad (not shown). The

bars I39 may be swung forward about pivots I43v at their lower ends until the bars are substantially vertical and the presser pad is directly above the bore I9. During the rotation of the driving shaft 3| under power, the bars are brought down by a toggle arrangement, whereby a pile of heel lifts which have been placed in a mold I45 is compressed, for the driving of nails therein, between the mold and the presser pad.

The mold I55 is supported in the following manner. The bracket I3 carries at its upper end a pin Hill on which is pivotally supported the rear end portion of a bracket I49. Two springpressed plungers I48 (see Fig. 3) housed in bosses I59 on the bracket M9, urge the bracket upward, normally holding it in an intermediate position, shown in Figs. 1 and 2, in which spring-pressed plungers (one of which is shown at I5I) carried by a bar I53 bridging the gap between the wings 2!, 29 prevent further upward movement by engagement with the front end portion of the bracket. If the plungers I5I are pulled forward to disengage them from the bracket, the latter may be swung upward about the pin I41 into an inoperative position, in which it is yieldingly retained by engagement of a spring-pressed detent I55 carried by the bracket I49 in a recess I51 in a stationary bracket I59 secured to the bracket I3. The mold I45 and bracket I 19 are held in this position to facilitate cleaning the parts thereunder.

The bracket I49 carries a plate I6I having an aperture I63 in which the upper end portion of the boss fits and abovethe aperture carries the mold I45 which is clamped to the plate IIil by spring-pressed clamping fingers I95 (see Fig. 5),

, arranged one at each side of the mold and carried by sleeves I61 rotatable in bores in the bracket The mold M5 is of a known type, comprising an upright wall enclosing a heel-shaped space, and has a flange I69 which is engaged by the fingers I65.

The machine as thus far described is intended to be operated as follows. First, a pile of lifts is assembled in the mold I45 and then the bars I39 are swung forward to bring the presser pad over the mold. The treadle I35 is now depressed to bring the slide member I3 into its forward position so that the cover plate I09 and the awls I 55 are beneath the mold. The starting lever 31 is next actuated to trip the clutch, causing a pricking cycle of operation of the machine during which one complete revolution is imparted to the main shaft-BI, the cam 29 lifting the plunger 25 and then lowering it. Since the pricker plunger III is above the plunger 25, the awls II5 pass up through the cover plate I09 and are driven into the pile of lifts in the mold to form passages into which the nails may be drivenr While the plunger 25 is rising, the bars I39 descend, carrying the presser pad downward to, compress the pile of lifts in the mold. As soon as the presser pad engages the lifts, the mold and the bracket I49 are forced downward against the action of the plungers I48 until the plate I6I engages the top of the slide member 13 and the actual compression of the lifts begins; a boss III on the cover plate I99 now fits snugly in the aperture IE3. As the presser pad rises after the compression is finished, the mold is lifted a short distance by the plungers I43, the boss Ill being disengaged from the aperture IE3 and enough clearance being provided between the plate I6! and the boss III to allow the slide member I3 to slide rearward.

After the shaft 3| has made one complete revolution and come to rest, the treadle I35 is released, whereupon the slide member I3 is moved rearward by the spring I33, bringing the nail block 93 under the mold. Then, the starting lever 31 is again'actuated to trip the clutch to give a nail-driving cycle of operations, during which the driving shaft makes one complete revolution and causes nails which previously will have been placed in the nail block 93 by the operator to be driven upward into the holes which have been made in the lifts by the awls during the previous pricking cycle. At the conclusion of the nail-driving cycle, the bars I39 rise to lift the presser pad away from the mold and when the machine comes to rest, the operator swings the bars back into their rearward positions.

Provision is made for preventing the machine from being so operated that the nails are driven first and then the awls are operated, in which event damage would be done to the awls and the heel. The starting lever 37 has three arms, of which one, I'I3, extends upward and forward from a fixed pivot stud I15 and terminates in a handle I'll. A second arm I19 extends forward from the pivot stud H5, while a third arm I8I extends rearward and is pivotally connected to the upper I end of alink I83, the lower end of which is pivotally connected to one arm I35 of a clutch-tripping lever pivoted at its mid-point upon a pin I89. The clutch-tripping lever also has a'rearwardly extending arm I81, to which is pivotally connected an upright link I9I which is urged in a counterclockwise direction, as viewed in Fig. l, by a spring I93.

The single-revolution clutch is so arranged that when the handle Ill is brought forward to an intermediate position from its extreme rearward position, the link I9I is lowered and a shoulder I95 thereon pulls down an arm I9I, allowing the clutch to engage. Further downward movement of the link I9I will cause the shoulder I95 to be disengaged from the arm I91 by co-operation of a cam face I99 upon the link with a stationary pin 29!, allowing the arm I9! to rise into such a position that when the driving shaft 3i has completed one revolution, the clutch will be disengaged and the shaft will be stopped. From the foregoing, it may be understood that if the handle I'Il is held in front of its extreme rearward position, the machine cannot be started from rest and, similarly, it cannot be started if the handle is in its rearward position and is prevented from moving forward past its intermediate position.

Loosely mounted on the rockshaft H9 is an arm 293 which carries at its end an arc-shaped stop piece 295. The arm 293 also has an arouat hub portion 257 which co-operates with an arouate hub section 299 formed as part of the rocking lever I27 so that the arm 203 is constrained to turn with the lever I2l, except that a small .and the lever I21.

amount of play is allowed between the hub portion 201 and the hub section 209, permitting some relative angular movement between the arm 203 The arm 203 is urged in a counterclockwise direction about the end of the rockshaft II9, as seen in Fig. 6, by a spring 2I3 connected to a stationary part of the machine, thustaking up the play indicated at 2| I in a counterclockwise direction. The arm 203 may, however, move clockwise relatively to the lever I21, against the action of the spring 2I3, if it is required to do so.

Normally, when the machine is at rest before the commencement of a sequence of operations as outlined above, the slide member 13 is in its rearmost position in engagement with the screw I40 and the handle I11 is, in a forward position where it is held by engagement of a pin 2I5 fixed in the right-hand bar I39 with an upper surface of the arm I19 of the starting lever 31. The starting lever cannot be actuated to trip the clutch until the bars I 39 have been swung forward to bring the presser pad over the mold I45. When the bars I39 are in their forward position, the pin 2I5 is in front of the end of the arm I19 but the starting lever 31 cannot yet be swung rearward because a stop pin 2I1 upon the arm I13 engages the lower part of the outer face of the arc-shaped stop piece 205. It is only when the treadle I35 has been depressed sufficiently far to bring the slide 13 to its forward position that the pin 2I1 can pass above the stop piece 205 to free the starting lever for rearward movement to its extreme rearward position, from which it may be moved forward to trip the clutch.

The stop piece 205 thus operates to prevent the machine from being started until the slide has been brought to its forward position and, in this Way, prevents the nails from being driven before the awls have been operated to prick the lifts. It also operates to prevent the machine from being started with the slide in an intermediate position, which would result in breakage of the machine.

When the bars I39 have been brought forward and the treadle I35 has been fully depressed, the handle I11 moves back under the action of a spring 299 into its extzeme rearward position, from which it may be moved forward to trip the clutch, whereupon the clutch engages and the awls H5 are operated to prick the lifts. Thereafter, the bars I39 move up, but the handle I11 being now in its rearmost position, the arm 419 is higher than it was in the beginning and the upper surface of the pin 2 I5 is substantially level with an arcuate surface on the under side of the rm I19. Consequently, if the bars 539 should be allowed to move back, the pin 2 l5 would pass under the said arcuate surface and the starting lever 31 could not be actuated to trip the clutch. Normally, however, the bars I39 will be held forward during the entire sequence of operations.

After the machine has stopped in this intermediate condition, in which the lifts have been pricked but the nails have not been driven. i he treadle I35 is released, the stop pin 2I1 being back of the stop piece 205, whereupon stop piece 205 moves upward in front of the pin. During this upward movement, the handle 511 cannot be moved forward but when the slide It has reached its rearmost position, a part 2I9 of the stop piece 205 is presented to the pin 2H. The part 2I9 constitutes a cam so shaped that pressure of the pin 2I1 against it from behind causes the stop piece 205 to be lifted and the arm 293 .to be swung relatively to the lever I21 until the pin ,2 I 1 passes beneath the stop piece, this swinging movement being permitted by the play at 2! I; The starting lever 31 may thus be actuated to trip the clutch when the slide is in its rearmost position, but not until it has reached the rearward limit of its movement. Thus, again the machine cannot be started while the slide 13 is in an intermediate position; after the stop pin 2" has passed beneath the stop piece 205, the latter immediately swings down behind the pin and prevents rearward movement thereof.

As-the pin 2I1 passes beneath the stop piece 205, the handle I11 can be moved forward through its intermediate position, whereupon the clutch is tripped and, the slide 13 now being in its rearward position, the rotation of the driving shaft causes the driving of nails into the pricked holes in the lifts.

The operation of building a heel is now finished and when the machine comes to rest, the bars I39 are allowed to swing back, the pin 2I5 passing along the upper arcuate surface of the arm I19, and the heel may be removed from the mold. The machine isnow in its original starting position, with the pin H1 in front of the stop piece 205, and cannot be started again until the treadle I35 has been fully depressed to bring the slide 13 into forward position for the next pricking operation. I The machine is equipped with mechanism hereby at the end of the nail-driving cycle, upward movement of the bars I39 causes the heel to be raised to free it from themold and thereafter rearward movement of the bars causes the heel to be raised still further, so that it can be readily removed from the mold.

This mechanism is shown in Fig. 4 and includes an arm 22I secured to the left-hand end of the shaft 39 and an arm 223 secured to the shaft 39 near the center thereof and having a forward part 225 underlying the head 99 of the stem 91. Loosely mounted on the shaft 39 adjacent to the am 223 is a bell crank lever 221, 229, of which the upwardly and rearwardly extending arm 22'! carries at its end an eccentrically adjustable pin 23I. The bell crank lever is urged clockwise, as seen in Fig. 4, about the shaft 39 by a spring 233, such clockwise movement being limited by contact of a lug 235 on the forwardly extending arm 229, with a pin 231 carried by the arm 22L Clockwise movement of the arm 22I is limited by contact of the arm 223 with a stationary stop surface 238 (Fig. 2).

l The arm 229 carries at its end a pin 239 on which is pivotally mounted a latch lever having a forwardly extending hand piece MI and a downwardly extending arm 243 carrying two hooks 245, 241, one below the other. These hooks are adapted to co-operate with a pin 249 carried by the arm 22I, the latch lever being urged ggiiinterclockwise about the pin 239 by a spring The bracket I3 carries a lug 253 in which is carried a shaft 255. Secured to the shaft 255 is a downwardly extending arm 251 and secured to the left-hand end of the shaft is a depending lever 259, 'the lower end of which is pivotally connected to the rear end of a bar 25I which extends forward and carries at its front end a block 263. The bar 26I passes to the right of the left-hand bar I39 and is urged upward and rearward by a pull spring 265, the force of, which is only just suflicient to hold the bar ZGI up against its own weight and the weight of the block 263.

The arm 251 carries a lug 261 which, at times, cooperates with a pin 269 carried by an arm 21I secured to the left-hand end of the shaft I I9.

The mechanism just described operates in the following manner. At the conclusion of the naildriving cycle, the bars I39 rise and at this stage, the arm 223 rests on the stop surface 238 under the action of its own weight, the weight of the arm 22I and the tension of the spring 233, the lug 235 being in contact with the pin 231 and the hook 241 being below the pin 249. Since the treadle I is not depressed, the shaft II9 occupies a counterclockwise position, as viewed in Fig. 4, and the bar 26I is held rearward by the action of the spring 265, with the lug 261 in contact with the pin 269. In this position, the block 263 is above the rounded top surface 213 of a block 215 secured to the left-hand bar I39 and the block 263 abuts against the under side of a forward part of the arm 22I under the action of the spring 265.

As the bars I39 rise, the block 215 strikes against the under side of the block 263, after which-further upward movement of the bars I39 causes the shaft 39 to rock in a counterclockwise direction to lift the stem 91 and, consequently, cause the boss 95 to be thrust up through the aperture I 63 to free the heel from the mold. The lever 221, 229 is also rocked counterclockwise to some extent.

After the machine has stopped, the bars I39 are pushed rearward to afford access to the mold, the left-hand bar I39 abutting against the pin 23I and turning the lever 221, 229 counterclockwise a short distance relatively to the arm 22I, until the hook 241 engages the pin 249, whereupon the lever 221, 229 and the arm 22I turn counterclockwise together to lift the heel still further in the mold. After the heel has been removed, the arm 24I is depressed, freeing the pin 249 from the hook 241 and allowing the nail block 93 to drop so that a new pile of lifts may be assembled in the mold. The hook 245 serves as a safeguard to prevent the pin 249 from getting behind the arm 243. When a new pile of lifts has been assembled in the mold, the bars I39 are drawn forward and, with them, the bar 26I, the block 215 engaging the rear end of the block 263, which latter had slipped oi the forward end of the surface 213 when the bars I39 were swung rearward so that the arm 22I might drop when the hand piece 24I was depressed. The parts are now in the positions shown in Fig. 4.

The treadle I35 is now depressed, swinging the arm 21I forward until the pin 269 abuts the lug 261, with the block 263 in its forward position and holds the block in this position. As a result of the block 263 being held forward, the blocks 215, 263 do not co-o-perate during the pricking cycle of operation of the machine and there is no actuation of the arm 22I at the end of this cycle. However, when the treadle I35 is released prior to the nail-driving cycle, the block 263 may move rearward into its position above the surface 213, which it does as soon as the block 215 has been lowered sufliciently.

The arm 203 has integral therewith a handle 211, by depression of which the arm may be swung relatively to the lever I21 until the play at 2 has been taken up. When this is done. a spring-pressed plunger 219 carried by the arm I 29 engages in a recess in the arm 203 and holds the arm against clockwise movement relative to the arm I29, as viewed in Fig. 6, against the action of the spring 2 I3.

The arrangement is such that when this occurs, the stop piece 205 is too high for the pin 2I1 to pass rearward over it, even when the slide 13 is in its forward position and, consequently, the machine cannot be started. However, when the slide 13 is in its rearward position, the stop piece 205 is sufiiciently high to allow the pin M1 to pass forward or rearward beneath it so that the machine may be started repeatedly with the slide in nail-driving position. The handle 211 may thus be depressed and the spring-pressed plunger 219 allowed to become operative when it is desired to use the machine only for nail driving whereas, when it is desired to use the machine for pricking, the plunger 219 is with-. drawn from the recess in the arm 203 and retained in withdrawn position by any suitable means (not shown).

Having described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States isi 1. In a heel building machine, the combination of nail driving means and pricking means alternatively movable into operative position, power tools which is in line with the mold, and operator controlled means for preventing the application of power when the awls are in line with the mold.

3. In a heel building machine, the combination of a heel mold, a power driven actuator in line with the mold, a slide carrying a gang of nail drivers and a gang of awls, said slide being manually movable to place either the drivers or the awls between the mold and said actuator, and automatic means for preventing the application of power when neither the drivers nor the awls are in line with the mold.

4. In a heel building machine, the combination of a heel mold, a power operated actuator plunger, a slide carrying nail drivers and pricking awls which are alternatively movable into line with said mold and plunger, an operating shaft for moving the slide, a starting handle for controlling the application of power to said plunger, and a stop piece on said shaft constructed and arranged to prevent operation of the starting handle when neither the awls nor the drivers are in line with the mold.

5. In a heel building machine as defined in claim 4, a lostmotion connection between the stop piece and the slide operating shaft, and a detent for holding the stop piece on the shaft in such a position relatively to the starting handle that said handle can be operated only when the nail drivers on the slide are in line with the mold.

WILLIAM RODERICK BARCLAY. HUBERT BOOTI-IROYD.

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