US1812023A - Punching and upsetting machine - Google Patents

Description

June 3o, 1931. E. s. SEM/EY 1.812.023

PUNCHING AND UPSETTING MACHINE original Filed March 1o, 1926 5 sheets-sheet 1.

Y--MII e I I I I June 30, 1931.

E. S. SEAVEY PUNCHING AND UPSETTING MACHINE Original Filed March lOI 1925 3 Sheets-Sheet 2 BY /Lf@ INVENTOR 1S'. Sean@ /QATTORNEY June 30, 1931,. K E. s. sEAvEY 1,812,023

PUNCHING AN) UPSE'TING' MACHINE Original Filed March` 10, 1926 3 Sheets-Sheet 3 JZ? INVENTOR XXX@ Patented June 30, 1931 l Unire. stares PATENT OFFICE nanna s. snAVEY, or BETHLEHEM, rENnsYLvANIAssIGNoR To BETHLEHEM STEEL COMPANY g v PUNCI-IING AND UPSETTING MACHINE Original application led March 10, 1926, Serial No.

1927. Serial My invention relates to apparatus for perforating netal bars and in forming bosses around the perforations, and is more especially adapted for use in the manufacture of splice-bars used for connecting together the abutting ends of railway track-rails or the like. rlhis applicationis a division of my` copending application filed .Iarch l0, 1926, Serial No. 93,614.

One of the objects of my invention .is to form perforations in splice-bars or the like Without reducing the stiffnessl of the bar.

Another object of my invention resides in the manner I have of punching the bar Whereby a considerablyV stronger bar is produced Without adding materially to the Weight of the bar or cost of manufacturing the same.

A further object of my invention relates to the machine I have for perforating the splice-bar and forming bosses around the perforations at one operation.

Another object of my invention is to provide a machine with clamping-dies and pairs of oppositely disposed punches mounted adj ustably on reciprocating carriages which enter the bar from opposite sides thereof and displace the metal laterally around the holes formed.

Still another object of my invention relates to the manner of controlling the reciprocating carriages With the punches mounted thereon. x `V Ylferetofore in the manufacture of splicebars of low carbon steel a stock bar of conf siderable length is rolled, which, after it issues from the finishing roll-pass,` is conveyed to a hot-bed to cool. After the stockv bar has become cold it is cut into the desired 93,614. Divided and this application filed June 1, No. 195,619. Y

of the bar is cut or punched out of the bar, reducing relatively the strength of the bar at this point. To obviate this difficulty and to develop as near as possible the strength of the full cross-sectional area of the bar, I punch holes in the bar While the bar is hot or in a seini-plastic condition, and preferably as indicated diagrammatically in Fig. 7 just after the stock-bar has left the finishing rollpass, it is cut into the desired lengths and then conveyed to a perforating machine, Which punches holes in the bar, but instead of punching out the metal in the bar to form a hole, I punch holes in the bar in such a Way that the metal is displaced 0r forged laterally around the hole in the bar thereby forming a reinforcing boss on the side, or sides of the bar.

In some cases it may be found preferable not to operate the rolling mill in conjunction with a punching machine, for the reason that in case one of the machines breaks or is made inoperative for any cause the other Inachine would have to remain idle thereby affecting tivo shifts of men, and I do not Wish to limit myself to punching` the bar directly after rolling but may reheat and punch the splice-bar lengths at any time after the bar has been rolled.

Other objects ofmy invention will appear hereinafter.

Having thus given a general description of my invention, I Will novv, in order to maire the 'same more clear, refer to the accompanying three sheets of drawings in Which like vcharacters of referenceindicate like parts.

l is a front elevation of my improved machine adapted to perforate metalbars:

Fig. 2 is a vertical section of the machinel shown in Fig. l, taken on. the line II-II of ig. l; f

Fig. 3 is a detail vieiv drawn on a larger scale illustrating the first position in perforating a bar With one kind of a pair of oppositely disposed punches, one punch having` 0 a flat end face being advanced into the bar to be punched to the end of its Working stroke, While the other punch has a pointedV end face which has advanced until it has met the fiat face of the opposite punch.

Fig. 4 is a detail view similar to that shown in Fig. 3 but showing the position of the punches at the end of the perforation operation;

Fig. 5 is a detail view illustrating the first positionithe punches will assume in punching a bar, when the punches both have pointed end faces;

Fig. 6 is av detail view similar to Fig. 3, but showing the punch with the fiat end face advanced to the end of the working stroke, only to the side of the bar to be punched,

Fig. 7 illustrates.diagrammatically how a bar may be rolled, cut into lengths and-then perforated, without reheating t-he bar;

Fig. IS shows ythe `manner of splicing the abutting ends of a pair of railroad-rails together and the points atwhich a splice-bai' usuallyl fails under heavy load;

Fig.f9 illustrates a form of Ypunch I may use having an ejector for preventing the slug from sticking-to the ends of the punches at the end of the punching operation;

.F 10 is a perspective view of the inside of an angle splice-bar of well known type with bosses formed around the perforations in accordance with my invention;

Fig. 11 is aperspective view of the inside of another type of splice-bar with b formed around the perforations'similar to those illustrated in Fig. 10;

Fig. 12 is a detail view of the 'valve controlling mechanism and pipe coiincctions for reciprocating the `punch carriages;

Fig. 13 illustratesv the first position of another manner of punching a bar and forming` aV boss around the perforation; and

Fig. 14 illust-rates an adjustable stop for-med in theend of one of the cylinders for reciprocating the punch carriages.

Referring now to the characters of reference on the drawings Aand more especially to Figs. 1, Q. 3. 4, 6, 10. and 11 the numeral 1 indicates the base plate-of the punchingmachine and 2 the side frames having slide-ways formed thereon as at 3. 4 the top frame, and 5 and 6 intermediate .cross-tie'members, all of which .are flanged as at 7, 3, 9 and 10, respectively, and attached to the side frames 2 by means of bolts 11. The side frames 2 are further connected by means of al workreceiving table 12 for supporting the work to be punched.

Oppositely disposed carriages 13 and-.'14 are adapted to reciprocate on the slide-ways 3. The carriage 13 having rearwardly7 ef;- tending flanges 15, perforated at 16, for rcceivingipin 17 which connects the pistons 18 and 19 of the main punching pressure cylinder Q0, mounted on the top frame 4, and the pull back cylinders 21, `mounted on the cross tie member 5 by means of flanged clamping segment plates Q2 and 23 which engage grooves 24 and i5 in the sides of the cylinders between the shoulders 26 and the enlarged inner ends thereof.

The carriage 13 is formed with a dovetailed projection 27 which extends into dovetailed grooves 28 formed in the punch-holders 29 and into the bracket. supports 30 for the resilientl)7 mounted die 31, said die being attached to the supports by means of bolts A32, at each end of the die. A helical spring 33 with washers at each end is mounted on the bolts 32 between the resiliently mounted die 31 and the bracket supports 30, one end of said bolts extending through the bracket supports 30, with a nut thereon as at 34, while the opposite ends extend through the outer ends of the resiliently mounted clamping-die with a retaining nut as at 35. The

punch-holders 29 which carry punches 36,

means of set-bolts 42 and carry punches 43,'

said carriage having an outwardly extending'abutment 44, and a rearwardly extending flange 45,V t0 which is attached the piston 46 of -a fluid-pressure cylinder 47 which is mounted on the cross frame 6. The carriage v 14 is limited in itsfupwardmovement by means of adjustable stop-bolts 48 ywhich are carried by two or more of the punch-holders 41 and engage-the under side of the workreceiving table 12.l 49 indicates a stationaryy die inountedon thework-receiving table 12 which may have water cooling pipes 50 and lperforations therethrough as at 51, which register with slots or holes 52 in the workreceiving` table through which the punches A extend. The top surface of the stationary die is recessed at 53, and made to conform in cont-our to one sideof the bar 54 to be punched. f

The movable die 31 is mounted opposite the stationary die 49, having` water cooling means 55 and perforations 56 for the passage of the i punches, and having its outer face 57 made to conform to the 'contour of the other side of the bar 54.

The carriage 13 is limitedin its downward I may however in some cases dispense with the adjustable stops 58 and 60, and limit the downward stroke of the carriage 13 by means ofthe lower end of the piston 19 coming in, contact with the end wall of the cylinder 21.

Referring to Figs. 1, 2, 3, 4, 6 and7, it will be noted that one of the punches indicated by the numeral 43 has a flat end face while the opposed punch 36 has a pointed end face. In this way a smaller slug 61 of scrap is punched out, although both of the punches may be made point-ed as shown in Figs. and 13, if desired. l

In Fig. 3, I have illustrated on a larger scale the bar to be punched, confined between the dies 31 and 49. The die 31 having a recess formed therein as at 62. In this figure, punch 43 has pierced the bar a short distance and is shown at the end of its working stroke while punch 36 has pierced the bar from the opposite side and advanced until the pointed end has come in contact with the flat face of the end of punch 43, and, in so doing has eX- truded the metal around the punch, filled the recess 62, and extended into the perforation 56 in the movable die 31. Owing to the greater diameter and power of the `piston 18, for advancing` the carriage 13, over that of the piston 46 for advancing the carriage 12, the punch 36 will continue to advance forcing back the punch 43 until the carriage 13 comes in contact with the stops 58, and the end of the enlarged portion 63 of the punch 36 comes in contact with the extrusion ow of metal adjacent thereto, thereby compressing it and forming a boss 64 around the perforation 65 as shown in Fig. 4 of the drawings.

In Fig. 6, I have shown a view somewhat similar to Fig. 3, but in which the punch 43 when it is at the end of the working stroke does not pierce the bar to be punched and only advances until it contacts with the side of the bar 54. l

In Fig. 5, I have illustrated a pair of oppositely disposed punches 36 and 43', each having pointed end faces, in which yboth punches meet substantially in thecenter of the web of the bar, whenpunch 43l is at the end of its working str-oke. otherwise the construction and operation is the same as described in Figs. 3 and 4.

In Fig. 13, I have illustrated another modified form of punching the bar in which punch 3 is shown at the end of its working stroke as having passed entirely through the bar to be punched, while the point of the punch 36 has just come in contact with the point of punch 43 and is ready to advance until the shoulder 63 comes in contact with the extruded metal to vcompress it, thereby forming a boss as clearly shown in Figs. and 11 of the finished bar. This method of punching shown in Fig. 13 has the advantage of having all the metal retained in the bar and no scrap or slug is punched out.

`When a slug or scrap piece is punched out it often happens that the slug will stick to the end of the punch and has to be removed. In Fig. 9, I have shown a punch having means for ejecting the slug in which the punch is formed in two parts 66and 67 screwed together as at 68. The head portion 67 is tubui lar and formed with a socket 69 for receiving a helical spring 7 6 which surrounds the reduced end 71 andcontacts with a collar-72 of an e]ecting pin 7 3. which entends through the central opening 74 of the head portion 67 of the punch and with the forward screwthreaded end of the punch portion 66. When the punch lieadportion 67 is piercing the bar the ejecting pin 73 which has a pointed outer end 7 5 is easily forced backward until the reduced upper end contacts with the screwthreaded end of 66 and in order that it may act more freely an air opening is formed in the side wall of the 'punch head portion 67 as at 7 6. At the end of the punching operation,

the ejecting pin is projected' forward by 1 means of the spring into the position shown in v2 and 12, 83 indicates the -niain fluid supply pipe which is controlled by a three-way valve 84 which controls the admission or exhaust of fluid pressure to the cylinders and 47 through branch pipes 85 and 86 respectively. Valves 87 and 88 are provided in branch pipes 85 and 86 for opening, closingv and regulating the amount of supply of fluid-pressure to the cylinders 20 and 47 so that the carriages 13 and 14 may be advanced with the desired speed so that the punches willoperate together at the required time. Another threeway valve 89 controls the supply or exhaust of fluid-pressure to the'pull-back cylinder 21 having a-pipe connection 9() between the main supply pipe 83 and the valve, and another pipe connection 91 between the valve and the s pull-back cylinder. These two three-way valvesv84 and 89 are also connected together by means of an exhaust pipe 92. Arms 93 and 94 are attached to the stems of the three-way valves 84 and 8-9. The arm 93 having a handle 95 formed at its outer end and these arms are connected together by means ofa link 96 so that both of the three-way valves will work Y together in unison vin such a manner thatl when the three-way valves are in thevposition indicated in full lines in Figs. 1 and 12, fluid-pressure willbe admitted to bot-h cylinders 2O and 47 thereby advancing the carriages 13 and 14 to the end of theworking stroke or to the completion of the punching operation, and the fluid-pressure from the pull-back cylinder 21 will be exhausted. Villen the ai'in 93 havingthe handle 95 is r0- tated a quarter of a revolution as indicated iii dottedlines in vFig. 1, the fluid-pressure from cylinders 2O and 47 will be exhausted while fluid-pressure will be admitted to the pull-baci;-cylinder 21 as will be readily understoodby referring` to the drawings.

The operation of in y machine is as follows Assuming that the splice bar length has been reheated or that the stock-bar 96 has just issued from the finishing pass of rolls 97 and the bar cut by means of a shear 98 into the desired lengths 54 and then conveyed to the stationary die 49 while still in a hot or semiplasticcondition as indicated diagrammatically in Fig. 7, and the machine and valve controlling mechanism being in the positions shown in Figs. 1, 2 and 12, which is the position they ywill assume at the beginning of the working stroke, fluid pressure will be admitted to cylinders Q and 47 thereby advancing simultaneously both of the reciprocating cai'- riages 13 and 14 toward each other. The valves 87 and 38 in the pipe connections 85 and 86 should be adjusted so that the resilieiitly mounted movable die` 31 will contact with the face of the stationary die 49, thereby coniiiiing the bar 54 therebetween before the punching operation commences. The carriages 13 and 14 carrying punches 36 anc 43 continue to advance toward each other until the punch 43 reaches the end of its working stroke which is determined by means of the adjustable stop 48, which comes in contact with the under side of the work-receiving table 12, thereiid of the working stroke ot these punches being indicated in Figs. 3, 5, G, a'nd 13 of the drawings. The punches `36 carried by'ca-rriage 13 however continue to advance after it contacts with the end oi punches 43, and owing to the greater size and power of cylinder 20, over that of 47, forces back the punches 43 and extrudes the metal in the bar punched, into,and ifilling the recesses 62 in the movable-die 31, until the shoulder 63, on the punches 36, comes in contact with the extruded metal and compresses it to the desired decree, which is determined by the carriage 13 coming in contact with the adjustable stops 53 or the lower end of the piston 19 coming in contact with the end wall of the cylinder 21; The end of the punching-operation being indicated in Fig. 4. The operator then moves the arm 93 by means of the handle 95 to the position indicated in dotted' lines in Fig. 1, whereby the valves 84 and 89 are rotated a quarter of a revolution, the vfluid-pressure from the cylinders and 47 will then be exhausted allowing the lower carriage 14 to reciprocated.downward by gravity, vat the saine time fluid-pressure will be admitted to the pull-back cylinder 21 to'raise the carriage 13. The carriages will then be in the positionillustrated in Fig. 2. The linished splice-bar can then be removed from the stationary die and another splicebar blank inserted in Vits place and .the operation above described repeated.

In Figsl() and 11,.'I have illustrated splicebars having bosses-around all of the perforations. I may in some cases, however, only forni bosses around the twoI central perforationsorI may instead of formingroundlholes as illustrated in the drawings, punch other shaped holes with bosses around them, as

oval,'triangular, square, hexagonal or any other form desired, and although I have shown the bosses `formed-on the inside of a splice bar they could be formed on-the outI side of the bar, or on both 'sides-equally as well. n Although I have shown and described my invention in considerable detail, I' do not wish to be limited to the exactand specific details shown and described, but may use such submounted upon the slide-ways on either side of the work-receiving table, a plurality of punches adj ustably mounted on each carriage, the axes orp the punches on one carriage at one side of the work-receiving table being in alignment with the axes of the punches on the carriage at the opposite side of the workreceivingv table, means for simultaneouslyr advancing both carriages'toward each other until the ends kof the punches contact with each other and for partially retracting onev carriage by continued movement of the other carriage, and means for retracting the carriages.

2. In a machine for perforating metal shapes, the combination of a stationary frame, slide-ways thereon, a work-receiving table mounted upon the frame, a carriage mounted upon the slide-ways at either side of the work-receiving table, a plurality of punches adj ustably mounted on each carriage, the axes of the punches on one carriage at one side of the work-receiving table being in alignment with the axes of the punches on the carriage at the opposite side of the work-v receiving table, a stationary clamping-die mounted upon the table, amovable clampingdie mounted on one of the carriages opposite the stationary clamping-die and adapted to clamp a metal shape therebetween, means for simultaneously advancing both carriages toward each other into the'bar until the ends of the punches contact with each other and for partially retracting one carriage bythe continued movement of the opposite carriage, fluid-pressure means for retracting one of the carriages while allowing the opposite carriage to retract by gravity.

3. In a machine for perforating metal shapes, the combination of a stationary frame, slide-ways thereon, a. work-receiving table mounted upon the frame, a carriage mounted upon the slide-ways at either side of the work-receiving` table, punches mounted on each carriage, the punches mounted on one carriage being in alignment with the punches on the other carriage, and Vmeans for moving the carriages toward eachother simultaneously until the ends of the punches contact with each other and then Jfor moving both carriages in the same direction and in spaced relation to each other.

4. In a machine for perforating metal shapes, the combination of a stationary frame, slide-ways thereon, a work-receiving table mounted upon the frame, a carriage mounted upon the slide-ways at either side of the work-receiving table, punches mounted on each carriage, the punches mounted on one carriage being in alignment with punches on the other carriage, and means fory advancing the carriages toward each other simultaneously until the ends of the punches contact with each other and then for retracting one of the carriages by the continued advancing movement of the other carriage.

5. In a machine lfor perforating metal shapes, the combination of a stationary frame, slide-ways thereon, a work-receiving table mounted upon the frame, a carriage mounted upon the slide-ways at either side of the work-receiving table, punches mounted upon the carriages, the punches mounted on one carriage being in alignment with the punches on the other carriage, means for moving the carriages toward each other simultaneously until the ends of the punches on one carriage cont-acts with the ends of the punches on the opposite carriage, and'then for partially retracting one of the carriages by continued movement of the other carriage, and fluid-pressure means for retracting one of the carriages while allowing the opposite carriage to retract by gravity.

6. In a machine for perforating metal shapes, the combination of a stationary frame, slide-ways thereon, a. work-receiving table mounted upon the frame, a carriage mounted upon the slide-ways .at either side of the work-receiving table, punches mounted upon the carriages, the punches mounted on one carriage being in alignment with the punches on the other carriage, means for advancing the carriages toward each other simultaneously until the ends of the punches on one carriage contact withthe ends of the punches on the opposite carriage, means for controlling the advancing movement of each carriage, means for retracting one of the carriages by advancing the ot ier carriage, and fluid-pressure means for retracting one of the carriages while allowing the opposite carriage to retract by gravity.'

7. Ina machine for perforating metal shapes, the ycombination of aA stationary frame, slide-ways thereon, a work-receiving table mounted upon the frame, a carriage mounted upon the slide-ways at either side of the work-receiving table, punch Vholders each having apunch, adjustably mounted upon the carriages, the punches mounted on one carriage being in yalignment with the punches mounted on the other carriage, a stationary clampingedie mounted upon the work-receiving table, a movable clamping-die carried by one of the carriages, means for advanc ing the punches carried by the carriages toward each other simultaneously until the ends of the punches mounted on the carriage contact with the ends of the punches mounted on the opposite carriage, means for controlling and limiting the ad'- vancing movement oi each carriage, means for retracting one oi'i' the carriages vby advancing the other carriage, and fluid-pressure means for retracting one of the carriages while allowing the opposite carriage to retract by gravity.

8. In a machine for perforating metal shapes, the combination of a stationary frame, .a slide-way thereon, a work-receiving table attached to the frame, .a carriage" Amounted on the slide-way at each side of the work-receiving table, punches mounted Vin holders on each carriage, the punches mounted on one carriage being in alignmentwith the punches mounted on the other carriage,

independent fluid-pressure means for advancing both carriages toward each other, andffiuid-pressure means for retracting one of the carriages while allowing the opposite Y carriage to retract by gravity.- p

9.'Y In a machine for perforating a metal bar, the combination of a stationary frame, a

'slide-way thereon, a work-receiving table attached to the frame, a stationary-die mounted on the work-receiving table, a carriage mounted on eachside of the work-receiving table, a movable-die attached to one of the carriages .and adapted to contact with the stationary-die for clamping a barV to be perforated, punches mounted in holders on each carriage, the punches mounted on one carriage being in alignment with the punches mounted on the other carriage, fluid-pressure means for advancing both carriages toward each other, means for limiting the forward movement of each carriage, and Huid-pressure means for retracting one of the carriages while vallowing the opposite carriage to retract by gravity.

- l0.-In a machine for perforating metal les V shapes, the combination ont a pair of opposed reciprocating carriages, punches mounted on each carriage, the punches on one carriage being in alignment with the punches on the opposite carriage, a stationary-die mounted between the carriages, a movable-die carried by one of the carriages, and fluid-pressure means for reciprocating the carriages.

ll. n a machine for perforating metal shapes, the combination of a pair of opposed reciprocating carriages, a plurality of punches mounted on each carriage, the punches on one carriage being mounted in alignment with the punches on the opposite carriage, means for adjusting the punches on the carriages in spaced relation to each other, a stationary die mounted between the carriages, a resiliently mounted movable die carried b y one of the carriages and cooperating with the stationary die to clamp a shape to be punched, and means for advancing the punches and perfor-ating the shape by extending the metal around the holes punched, and means for retracting the carriages. Y j

l2. In a machine for perforating metal shapes, the combination of a pair of opposed reciprocating carriages, a plurality of punches mounted on each carriage, the punches on one carriage being mounted in alignment with the punches on the opposite carriage, means for adjusting the punches on the carriages in spaced relation to each other, a stationary die mounted between the carriage, a resiliently mounted movable die carried by one of the carriages and cooperating with the stationary die to clamp a shape to `be punched, means for advancing the punches and pertorating the shape by extruding the metal in forming the holes around the holes punched, means for compressing the extruded metal around the holes punched, and fluid pressure means Jfor reciprocating the carriages.

13. In a machine for perforating metal shapes, the combination of a pair of opposed reciprocating carriages, a plurality of punches adjustably mounted on each carriage in spaced relation to each other, the punches on one carriage being mounted in alignment with theY punches mounted on the opposite carriage, a stationary die mounted between the carriages, a movable die carried Vb f one ot the carriagesv Huid ressure means l c i for simultaneously reciprocating both carriages toward each other until the ends of the punches mounted on one carriage contact with the ends of the punches mounted on the opposite carriage, means for sliding both carriages together in a fixed spaced relation to each other, and adjustable means for limiting the forward movement of each carriage.

let. In a machine for perforating metal shapes, the combination of a pair of opposed reciprocating carriages, a plurality of punches adjustably mounted on each carriage in spaced relation to each other, the punches on one carriage being in alignment with the punches mounted on the opposite carriage, means for adjusting the punches on the carriages in spaced relation to each other, a stationary die mounted between the carriages, a resiliently mounted movable die carried by one of the carriages and cooperating with the stationary die to clamp a shape to be punched, perforations through the dies in alignment with the punches, a recess formed around each perforation on the inside of one of the dies in contact with the shape to be punched, means for advancing the punches and perforating the shape by eX- truding the metal in forming the holes into the recesses around the holes punched, means for compressing the extruded metal around the holes punched, and means for retracting the carriages.

l5. In a machine for pertorating metal shapes, the combination of a pair of opposed reciprocating carriages, a plurality of punches adj ustably mounted on each carriage in spaced relation to each other, the punches mounted on one carriage being in alignment with the punches mounted on the opposite carriage, a shoulder formed on the punches mounted on one carriage, means for adjusting the punches on the carriages in spaced relation to each other, a stationary die mounted between the carriages, a resiliently mounted movable die carried by one of the carriages and cooperating with the stationary die to' clampa shape to be punched, perforations through the dies in alignment with the punches, the perforations in the die through which the punches having a shoulder pass being of larger diameter than the perforations in the die on the opposite side of the table, a recess around each perforation of larger diameter on the inside of the die in contact with the shape to be punched, means for advancing the punches and perforating the shape by eX- truding the metal in forming the holes around the holes .punched into the recesses, means for advancing the punches having the shoulders until they engage and compress the extruded metal around the holes punched, and means for retracting the carriages.

16. In a machine for perforating metal shapes, the combination of a pairof opposed reciprocating carriages, a dove-tailed projection extending from the Vertical face of each carriage, a plurality of punch holders mounted on each of the carriages, each having a dove-tailed groove :tor engaging the dovetailed projections, an abutment for the punch holders on each carriage adapted to form a backing for the punchV holders, a punch mounted in each punch holder, the punches on one carriage being mounted in alignment with thel punches on the opposite carriage,

means for adjusting the punches 0n the car- @l riages in spaced relation to each other, a stationary die mounted between the carriages, a resiliently mounted movable die carried by one of the carriages and cooperating with the stationary die to clamp a shape to be punchecL and means for advancing the punches and pei'forating the shape by extruding the metal around the holes punched, and means for retracting the carriages.

In testimony whereof I hereunto aix my signature.

ELMER S. SEAVEY.

Images