US1990571A - Shearing device for chain link forming machines - Google Patents

Description

7 F. E'. STAHL Feb. 12, 1935.

SHEARING DEVICE FOR CHAIN LINK FORMING MACHINES Filed July 24. 193; 2 Sheets-Sheet 1 vvEA/I'M IWZRANK E. STAHL 4 rrozrgvsy SHEARING DEVICE FOR CHAIN LINK FORMING MACHINES Filed July 24, 1953 2 Sheets-Sheet 2 forming machine.

ends on the blank.

Patented Feb. 12, 135

PATENT {OFFICE a .My invention relates in general to'shearing devices oi the punch and die type, and in particular "to 'suchsa device which may be used in.

connection 'with and operated'by a chainlink My invention relates specifically to the forming of blanks of predetermined length 'for the manufactureiof chain :links which are 'to have their ends united by electric butt welding. It

A is well known to those 'skilled in the art, that when welding chain links having straight faced ends in parallelgrelationship,gas pocketsyare sometimes .formed, thus weakening the weld.

My. invention is specifically designed to provide a chain; link blank with peculiarly formed ends which avoid the formation of such gas pockets, when welded together;

Oneu-ofthe objects for my invention has-been to provide a device of this nature which may be conveniently attached to a 'chain link forming machine and be conveniently operated by some part of the mechanism of :such machine.

Another object has. been to, provide a punch for such device which shall iprovi'deichisel shaped :Moreover,.:my devio'e isprovided with means for eiecting the slugs f-romthe punc-h. 1

-Furthermore, my invention is inexpensive to manufacture and durable in -constr-uction and operation. l A I The :above; cbjectssand advantages have been accomplished by. the-device shown in the accome panying'drawings, 'offiwhichz a I Fig. i is a side elevation, partly in section, of my device showing it attached -to 'th'e bed of a chain link forming machine. f a HE- ig. 2 is an enlargedjifragmentary plan view thereof, partly insection. i Fig. 3 an enlarged, transverse, sectional elevaticn 'ofmy devioetakennn line 3-3:of Fig. 1; Fig. '4; is a plan, sec Tonal view; taken 'online 4---4ofFig.-3. Fig, 5 is a perspective'view ofthe punch of my device, Fig. 6 vis .a perspective view :of the slide 'cam 'of my device. 1 V v w Fig;- W is aside elevation' of a modified form oipunch. ,I

My. device may be operated by suitable operating part of the chain link forming ma- I chine to which-it isappl-ied, but .1 :findit--convenient to use the =forming slide of such machine. In the drawings, therefore',;I have shownin somewhat fragmentary mannerthe slide 1-0 or" the chain forming 'lmachine which isreciprccated in the bed 11 ofythe machine by suitable cam means (not shown) "which preferably coact with the slide roller 1 2i,v i The, slide carries the rollers which form the blanks into links, but this structure is well know-nfin the :art and is, therefore, not shown or-described; A rocker arm. 13 is'pivctallysupported in-a bracket 14 above the bed 11 of the machinerin any suitable manner. Y This rocker arm has oneiof its-ends extending-rearwardly and is disposed over the slide 10. A rollerli iscarried.atthis-end of the arm. The other end of the arm extends forwardly and is-pivotally attached to they'c'onnection 150i my device by means of a shaft 16. r This shaft held against end movement preferably by means of a clamp 17 which engages a suitable groove formed in the shaft. The slide 10 is formed in-its rear end with a recess 20 with which {the rocker arm roller 14 is engagea'ble.

An inclined insert 21 is arranged at the rear of the recess, and is engaged by the roller, by which the rocker arm is oscillated. I

Arranged atthe forward end of the slide is a return arm 22. This arm has a level surface 23 which is connectedto a raised level surface 24 by means of an inclined surtace 25. I These surfaces are engageable with a roller 26 which is carried at the outer end of the shaft 16 of the rocker arm. The weight of the rear end of the rocker arm is normally sufficient tocause 0 this arm with its roller 14 todescend into the recess down the inclined surface of the insert 21; However, if. for any reason the arm should tend to remain in the position shown in Fig. 1, the inclined surface 25 of the return arm will engage with the rollerg26 and serve to push the forward endof the arm upwardly which will assurej'its positive return to the starting position.

My device comprises a .die block 30 which is mounted in a channel 31' formed in-the top surface of the bed 11 of the machine and extending at right angles tot-he slide 10 thereof. This channel is arranged preferably equidistantly from the center line of travel of the stock 3'7 from which the blanks are to be made. The die block is provided with a cover block 32 which is held in place upon the die block 30 by means of suitable bolts 33. The bolts .also serve to hold the die block upon the bed of the machine in an adjustable manner. ,Disposed within the die block are the front and rear dies 34 and 35, respectively. These dies are slightly higher than the depth of the channel in which they are mounted so that they come slightly above the upper surfaceof the die block 30, as shown in Fig. 1. The cover block 32 is, therefore, brought firmly to bear upon the dies to securely hold them in place against slippage within the die block. As shown in Fig. 4, the contiguous ends of the dies 34 and 35 are formed with faces which are V-shaped and of very obtuse angle. Each of the dies is, of course, provided with an aperture 36 therethrough for the passage of the stock 37 which is to form the blanks 38.

The cover 32 is formed with a centrally arranged rectangular recess 40 in which is mounted a punch holder 41. The upper end 42 of this punch holder is of semi-cylindrical formation, as shown by the dotted lines in Fig. 1, and this end is arranged for coaction with a semi-cylindrical recess 43 formed in the bottom of the connection 15. The punch holder is held in coacting contact with the connection 15 by means of side plates 44. Each of these side plates is secured to the connection 15 by means of suitable bolts and each of them carries a detent pin 45 which engages a recess 46 formed in the adjacent faces of the punch holder. The recesses 46 are provided at the center of the semi-cylindrical upper end of the holder so that the connection will be free to oscillate around over the semi-cylindrical surface while being securely attached to the punch holder.

In the lower end of the punch holder there is formed a recess 50in which is mounted the body 51 of the punch 52. A suitable set screw 53 is carried by the punch holder and serves to hold the body of the punch in place. The punch 52 of my device has two wings 54, each of substantially V-shaped cross-section, the wider dimension of the wing being at the outside of the punch. Where these two wings meet at the center of the punch, there is preferably formed a narrow flat surface 55. The side surfaces of each of the wings are, of course, of the same angle as the shearing faces of the dies 34 and 35, and they coact with such surfaces when the punch is operated. Formed in the punch 52 near its lower end is a shearing aperture 56 which registers with the apertures 36 formed in the dies 34 and 35 when the punch is in its uppermost position. Obviously, the angle of the cutting surfaces of the punch and the dies is substantially the same as that desired at the ends of the link blank.

Some suitable friction means is preferably pro-- vided for the blank 38 carried by the rear die 35 so as to hold the blank in such die. As shown in Fig. 4, this may comprise a body 60, carried by the die and having a spring-pressed plunger 61 mounted within it and having its forward end engageable with the blank 38.

When the form of punch shown in Fig. 5 is used, it is necessary to provide some means to eject the slug 62 (see Fig. 3). Such means preferably comprises a plunger 63 formed with a reduced end 64 which engages the aperture 56 of the punch when it is in its lowermost position, as shown in Fig. 3. The outer end of the plunger 63 is carried by a clevis 64 which is pivotally attached to one end of a lever 65. "This lever is pivotally mounted upon the base 11 of the machine by means of a stud 66. Connected to the opposite end of the lever 65 is an operating link 67. This link has its inner end pivotally attached to a bell crank 68 which is pivotally attached to the base 11 by means of a stud 69. The bell crank 68 carries an actuating roller 70 and a return roller 71. These rollers are mounted in different planes and engage with a slide cam 72. This cam is mounted in a suitable recess in-the inner face of the slide 10 and it is formed on the side which faces the bell crank lever with two sets of cam faces (see Fig. 6) for separate engagement with the rollers. One set of cam faces comprises a surface 73 parallel to the line of travel and an indented surface 74 also parallel to the line of travel, and connected to the surface 73 by means of an inclined surface 75. The indented surface 74 is at the rear end of the cam, and it is with surfaces 74, 75, and 73 that the return roller 71 engages, Underneath this set of faces is the other set, comprising an indented surface 76 at the forward end of the cam and parallel to the line of travel and a parallel surface 77, the surfaces 76 and 77 being connected by means of an inclined surface 78. It is with the surfaces 76, 78 and 77 that the actuating roller 70 engages. When the parts are in the position shown in Fig. 2, the plunger 63 of the ejector is in its inward position, as shown in Fig. 3, and has just ejected the slug 62 shown as falling through the space 79. As clear from Fig. 2, the actuating roller 70 is riding upon the parallel surface 77 and the return roller is disposed adjacent the indented surface 74. When the slide 10 carries the cam '72 inwardly, the bell crank lever 68 will be oscillated in a clockwise direction as return roller 71 rides up the inclined surface to the surface 73 and the actuating roller '70 will thereby be moved down the inclined surface 78 to the parallel surface '76. This clockwise movement of the bell crank lever will serve to quickly withdraw the plunger 63 out of the aperture 56 of the die before the die is elevated 'to a new working position. After the plunger has been withdrawn, the rollers 70 and 71 will move over the parallel surfaces '76 and 73, respectively, thus holding the parts of the ejector in their inoperative positions. The insert 21 of the slide 10 is so arranged that there is a slight movement of the slide 10 before the rocker arm roller 14 starts to descend over the inclined surface thereof, so that the plunger has ample opportunity to be withdrawn from the aperture 56 of the die before the punch is elevated. When the slide is being actuated in the opposite direction, the actuating roller 70 will engage with the inclined surface 78 and cause the plunger to be forced inwardly to eject the slug from the punch which has by this time been moved to its final inward position.

The slide 10 of the chain forming machine is provided with a pad formed on the face of the slide which is opposite to .my device. Passing through the slide and this pad is a holder 86 in which a previously cut blank 87 is carried when my device is being actuated. The blank 87 carried by the holder is the first blank to be cut and this has been pushed or fed to this position in the slide by means of the second blank 38, which is carried by the rear die 35. When the slide 10 is now again moved to its inward position, the stock 37 will again be fed through the dies and will push the blank 87 to the forming mechanism of the machine and the blank 38 to position in the holder 86 of the slide and ready to be fed to the forming mechanism during the next cycle of operation. It is preferable to provide the holder 86 with some means (not shown) for frictionally holding the blank 87 therein, and a device similar to the friction means carried by the front die 35 may be employed.

Instead of providing a relatively long punch, like that shown in Fig. 5, a punch like that shown in Fig. 7 may be employed. This punch has wings 88 and a body 89, but the aperture 90 is semicylindrical and the end 91 of the. punch termichine, having a slide, of a shearing device, com-v prising a rocker arm, cam means associated with the slide for oscillating the rocker arm, a die block in the path of the stock being formed into chain links, a punch slidably carried by the die block and coacting therewith to cut off said stock in predetermined lengths, having V-shaped ends, and means connecting the punch with the rocker arm.

2. The combination with a chain forming machine, having a slide, of a shearing device, comprising a rocker arm, cam means associated with the slide for oscillating the rocker arm, a die block in the path of the stock being formed into chain links, a punch having a shearing aperture slidably carried by the die block and coacting therewith to cut off said stock in predetermined lengths, having V-shaped ends, means connecting the punch with the rocker arm, and means for ejecting the slugs from the aperture of the punch.

3. The combination with a chain forming machine, having a slide, of a shearing device, comprising a rocker arm, cam means associated with the slide for oscillating the rocker arm, a die block in the path of the stock being formed into chain links, front andrear dies carried by the die block and formed with interspaced shearing ends, a punch slidably carried by the die block and coacting therewith to cut off said stock in predetermined lengths, having V-shaped ends, and means connecting the punch with the rocker arm. l

4. The combination with a chain forming machine, having a slide, of a shearing device, comprising a rocker arm, cam means associated with the slide for oscillating the rocker arm, a die block in the path of the stock being formed into chain links, front and rear dies carried by the die block and formed with interspaced shearing ends, a die block cover arranged over the die block and engaging with the dies to hold them in place, a punch slidably carried by the die block cover and shaped to coact with the shearing ends of the dies for cutting off said stock in predetermined lengths, having V-shaped ends, and means connecting the punch with the rocker arm.

5. The combination with a chain forming machine, having a slide, of a shearing device, comprising a rocker arm, cam means associated with the slide for oscillating the rocker arm, a die block in the path of the stock being formed into chain links, a punch holder slidably carried by the die block and having its upper end of semicylindrical form, apunch carried by the punch holder and coacting with the die block to cut off stock in predetermined lengths, having V- shaped ends, a connector pivotally mounted at the forward end of the rocker arm and having a semi-cylindrical recess in its lower end for engagement with the upper end of the punch soon as it is cut 'fr'omthei stock er t theconnection holder, and meaastbr "attaching the punch'hold pris'inga rocker arrm cam' means associated with thef'slide ear foscillating-tlie 'rockerarm; *afd-ie bflockdn "the o'fj'the stock being iormed- -into chain 'links'ja punch holder slidably "carried "by the die block and having its upper end of semicylindrical form, a punch carried by the punch holder and coacting with the die block to cut on stock in predetermined lengths, having V-shaped ends, a connector pivotally mounted at the forward end of the rocker arm and having a semicylindrical recess in its lower end for engagement with the upper end of the punch holder, a side plate attached to each side of the connection, and a detent pin carried by each of the plates and engageable with a centrally arranged recess in the semi-cylindrical end of the punch holder.

7. The combination with a chain forming machine, having a slide, of a shearing device, comprising a rocker arm, cam means associated with the slide for oscillating the rocker arm, a die block in the path of the stock being formed into chain links, a punch having a shearing aperture slidably carried by the die block and coacting therewith to cut off said stock in predetermined lengths, having V-shaped ends, means connecting the punch with the rocker arm, an ejector plunger carried by the die block and engageable with the aperture of the punch, and means associated with the slide for causing the plunger to be operated in timed relation with the punch.

8. The combination with a chain forming machine, having a slide, a shearing device, comprising a rocker arm, cam means associated with the slide for oscillating the rocker arm, a die block in the path of the stock being formed into chain links, a punch having a shearing aperture slidably carried by the die block and coacting therewith to cut off said stock in predetermined lengths, having V-shaped ends, means connecting the punch with the rocker arm, an ejector plunger carried by the die block and engageable with the aperture of the punch, a cam carried by the slide, a bell crank lever pivotally car- .ried by the bed of the machine and having a roller engageable with the cam, and means connecting the bell crank lever with the plunger.

9. The combination with a chain forming machine, having a slide, a shearing device, comprising a rocker arm, cam means associated with the slide for oscillating the rocker arm, a die block in the path of the stock being formed into chain links, a punch having a shearing aperture slidably carried by the die block and coacting therewith to cut off said stock in predetermined lengths, having V-shaped ends, means connecting the punch with the rocker arm, an ejector plunger carried by the die block and engageable with the aperture of the punch, a cam carried by the slide and having two separate cam faces, a bell crank lever pivotally mounted upon the base of the machine and carrying two rollers, one engageable with each of the cam faces, and means connecting the plunger with the bell crank lever.

10. The combination with a chain forming machine, having a slide, of a shearing device, comprising a rocker arm, cam means associated with the slide for oscillating the rocker arm, a die block in the path of the stock being formed into chain links, a punchslidably carried by the: die block and coacting therewith to cut of! said,

stock in predetermined lengths, and meansconnecting the punch with the rocker arm.

11. The combination with a chain forming machine, having a slide, or a shearing device, comprising a rocker arm cam means associated with the slide for oscillating the rocker arm, a.

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