US399828A

US399828A - burdsall

Info

Publication number: US399828A
Authority: US
Publication date: 1889-03-19
Anticipated expiration: 1906-03-19

Description

(No Model.) 4 'sheets sheet 1.

E. BURDSALL, Jr.

BOLT HEADING MAGHINE.

No. 399,828. Patented Mar. 19, 1889.

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(No Model.) -4- Sheets-Sheet 2.

E. BURDSAL L, Jr.

BOLT HEADING-MAGHINE.

No. 399,828. Patented Mar. 19, 1889.

35 )Zawmoww '(No Model.) 4= Sheets-Sh eet 4.

E. BURDSALL, Jr.

BOLT READING. MACHINE. No. 399,828. Patented Mar. 19, 1889.

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Tfi!=lE UNITED TATFS arnnr rricn.

ELLIVOOD BURDSALL, JR, OF PORT CHESTER, NEIV YORK, ASSIGNOR OF ONE-HALF TO RICHARD H. BURDSALL, OF SAME PLACE.

BOLT-HEADlNG MACHINE.

SPECIFICATION forming part of Letters Patent No. 399,828, dated March 19, 1889. Application filed Ap il 28, 1888. Serial No. 272,134. (No model.)

To all 1071/0712 it may concern.-

Be it known that I, ELLWooD BURDsALL, J12, a citizen of the United States, residing at Port Chester, in the county of I'Vestch ester and State of New York, have invented certain new and useful Improvements in Bolt-Heading Machines; and I do hereby declare the follow ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to simplify and improve the construction of this class of machines. With these ends in view I have devised the novel construction of which the following description, in connection with the accompanying drawings, is a specification, numbers being used to denote the several parts.

Figure 1 a plan view of the entire machine, a portion being broken away to show the construction more clearly, the headingram being at its extreme forward position Fig. 2, a detail side elevation of the right side of the machine, as seen in Fig. 1; Fig. 3,21 longitudinal section on the line in Fig. 1, the plunger being at its retracted position; Fig. 4, a longitudinal section on the line y 3 in Fig. 1, the plunger being at a position approximately midway between the extremes of its movement; Fig. 5, a longitudinal section on the line y y in Fig. 1, the plunger being at its extreme forward position, as in Fig. 1; Fig. (3, a detail crosssection, on an enlarged scale, on the line z .2 in Fig. 1; Fig. 7, a detail side elevation, on an enlarged scale, of the carrier and one of the cutters, the position of the parts being reversed, theview being from the opposite side to that in Fig. 6; Fig. 8, a detail view illustrating the adjustment of the cutter and carrier and also the stop, whereby the length of wire cut at each operation is determined; Fig. 9, a detail sectional view on the line .9 s in Fig. 8; Fig. 10, an elevation, as seen from the inner side of the receiver detached, the ends of the grippers appearing in elevation. Figs. 11, 12, and 13 are diagrams illustrating steps in the operation of heading a bolt, more especially a plow-bolt; and Fig.

14c is a view of a plow-bolt as formed by my improved machine.

The present machine is adapted for the manufacture of all classes of bolts, an important improvement in operation being that the blank is cut off and carried in front of a suitable die and then forced into the die by an upsetting-punch, the inner end of the blank resting against a plunger supported by a yielding stop, whereby I am enabled to greatly increase the speed of the machine, as the headed bolts can be expelled without difficulty, there being no binding of either bolt or head in the die. I am furthermore enabled to produce perfectly-formed heads upon all classes of bolts. In practice I have found my improved construction to be especially valuable in the manufacture of plow-bolts, which are ordinarily made with a double head, there being a squared head to engage the plate under the share and an outer head which engages the share and is ground down smoothly. Heretofore in the manufacture of this class of bolts by machinery it has been difficult to produce the squared portion of the head at a reasonably high rate of speechas sufficient metal could not be displaced laterally to fill the recess in the die, the tendency being to crowd the metal forward, which caused the shank to bind in the die and rendered the operation of expelling the headed bolts difficult and necessarily reducing the speed of the machine.

1 denotes the bed or frame of the machine; 2, the shaft to which power is applied by a belt (not shown) running over a wheel, 3, on said shaft. The movements of the several parts of the machine are all imparted from shaft 2 by means of crank-pins l and 5 at the left and right ends of the shaft, respectively, and an eccentric and strap at the center of the shaft. The bed is supported on suitable legs, denoted by 7. 8 and 9 denote, respectively, the upper and lower feed-rollers, and 10 and 11, respectively, their shafts. The feed-rollers are provided with semicircular grooves in their edges and hold the Wire with sufiicient pressure to feed it forward positively. Shaft 10, carrying the upper feeddisk.

roller, is pivoted to a bracket, 12, projecting outward from the bed in such a manner as to give the upper roller a vertical adjustment in order to regulate the pressure upon the wire.

13 is a set-screw bearing against the journal-box of the upper roller-shaft, whereby its adjustment is regulated. The feed-roller shafts are provided with gears 14, (one only being shown,) which engage each other. Motion is communicated to the shaft of the lower feed-roller from shaft 2 by means of a connecting-rod, 15, the ends of which are secured, respectively, to crank-pin 4 and to a double disk, 16, which oscillates on shaft 11.

17 is a ratchet rigidly secured to shaft 1.1, which is engaged by pawls 18, carried by the 19 denotes springs connected to the shanks of the pawls, which act to hold the pawls in engagement with the ratchet. This construction being in common use, does not require a detailed description.

It will be seen that each rotation of crankpin 4 imparts an oscillation to the disk, which in turn, by means of the pawls, imparts a forward movement to ratchet 17 on shaft 11, thereby actuating the feed-rollers. Any required adjustment of this portion of themachine is secured by moving the crank-pin in or out, it being carried by an ordinary dovetail block (not shown) sliding in disk 20 at the end of the shaft. As the wire is fed forward by the feed-rollers, it passes through a tube, 21, rigidly secured in the framework, then through a tube, 22, rigidly secured in a die-block, a3, and then through a short tube, 2i, made of tempered steel, which serves as the stationary member'of the cutting device.

25 denotes a movable cutter, carried by a block, 26, adj ustably connected to a crossslide, 27, as will presently be explained.

The thrust of the movable cutter in the act of cutting is sustained by a set-screw, 23, in the frame-work, which bears against the die-block. The cross-slide is bifurcated, as shown, and embraces a slide, 31, having a cam-slot, 32, which is engaged by a roller, 33, carried by the cross-slide. The shape of camslot 32 is clearly shown in Fig. 1.

It will. be seen that each reciprocation of the slide will cause a corresponding reciprocation of cross-slide 27. Motion is imparted to the slide by means of a connectingrod, 34, which is pivoted to the slide and adjustably connected to a block, 35, engaged by crankpin 5 on the main shaft.

42 denotes spring-arms secured to block 26, having at their forward ends grippers 43, which hold the blank after it has been severed from the piece of wire by the cutters and carry it forward to the heading mechanism. These grippers are preferably provided with steel dies 44, which engage the blank.

43 denotes guides in which the grippers slide. The grippers in practice incline inward slightly, (not shown in the drawings,) and are forced outward against the guides when the wire is fed forward between them, so that the severed blank is held firmly and carried to the proper position before the heading-die when the slide moves forward. As soon as the blank is in position before the die, the header moves forward. and forces it into the die, which movement will be again referred to. The cross-slide now returns to place, the grippers springing over the blank and leaving it in the die. The movement of the grippers in leaving the blank is shown by the dotted lines in Fig. 7.

It will of course be apparent that delicate adjustments are required to insure the perfect operation of the grippers in connection with different dies and cutter-tubes, the dies being liable to warp in tempering sufficiently to necessitate new adjustments. This I accomplish in the manner which I will now describe.

28 (see Figs. 6 and 8) denotes a screw, one end of which engages a recess in cross-slide 27, and the other end a collar, 29, said collar being provided with a groove engaged by arms 26 at the rear end of block 26.

30 is a check-nut bearing against the end of the cross-slide which looks the parts in position after adjustment. This construction enables me to so adjust block 26 and the grippers as to carry the severedblank forward the exact distance required to leave it in front of the heading-die, so that as the header moves forward it will force it straight into the die without friction and without the slightest injury to the blank. In order that I may be enabled to adjust the throw of the cross-slide on its return movement, so that the grippers shall stop in the exact position necessary to receive the wire as it is fed forward, I make cam-slot 32 in the slide of greater width than the diameter of roller The adjustmentis effected as follows:

36 is a cross-head adjustably connected by rods 37 to the cross-slide, and 38 is a bifurcated lever pivoted to the cross-head and to a link, 39, the other end of which is pivoted under the frame-work.

4:0 is a spring connected to the lower end of the lever and to the under side of the frame-work, as is clearly shown in Fig. 6.

41 is a threaded rod, which engages the frame-work and projects outward, passing loosely through the cross-head. 41 is a nut at the outer end of this rod, which is so adjusted as to stop the outward movement of the cross-head, and consequently of the cross-slide with which the cross-head is rigidly connected, at the exact position necessary to leave the grippers in position to receive the wire as it is fed forward. A check-nut is provided to lock nut 41 in position after adjustment. It will thus be seen that as the crossslide is moved inward by the engagement of roller with the cam-slot in slide 31 the movement isagainst the power of spring 40, which will hold the roller in engagement with the outer IIO side of the cam-slot, and on the return movement will draw the cross-head and cross-slide outward until the movement of the former is stopped by nut i1 on red 41.

\Vhenthe die has been changed or adjustment of the grippers is required for any reason what ever, slide 31 is thrown to its extreme position forward, which throws the cross-slide forward also. Check-nut 30 is turned outward and screw 28 turned until the grippers are placed in such position that a blank held thereby will pass freely into the die, so that in use when the header moves forward there will be no possibility of bending the bolt, or even of pressing it against either side of the die. Checknut 30 is then turned up tight against the end of the slide, which locks the parts in position. Having effected the forward adjustment of the grippers, slide 31 is thrown to its extreme retracted position, which of course retracts the cross-slide also. While the parts are at the extreme retracted position, the check-nut on rod 41 is loosened and nut 41 is either turn ed inward or outward, as may be required, on red 11, allowing the cross-slide to be moved until the grippers are just in position to receive the end of the wire as it isfed forward. Having effected this second adjustment of the grippers, nut a1 is turned up against the cross-head and is locked there by the checknut. This insures that at each return movement the cross-head and cross-slide shall be stopped at the exact point to permit the grippers to receive the end of the wire.

to (see Figs. 4 and 6) denotes the headingdie, which is secured to die-block 23 by setscrews 46.

It will of course be understood that the recess in the face of the die is made the exact shape of the head which it is desired to form upon the bolt.

47 is the header carried by a ram, the con struction and operation of which I will briefly describe.

t8 is a slide supported within the frame work by plates 49, above and below, which are bolted thereto. The header is socketed in a block, 50, lying in block 51, which is itself keyed to the slide, as shown in Fig. 1. Back of block 50 is a block, 2, and back of block 52 an adj usting-block, 53, which israised and lowered by a set-screw, 54, suitably connected thereto. The back of the adjusting-block is inclined and bears against a corresponding incline upon the slide, which is of course made very heavy.

55 is an eccentric at the center of shaft 2, 56 the eccentric-strap, and 57 the eccentricrod, the forward end of which is pivoted to the slide, as is clearly shown.

58 is a downwardly-extending arm of the eccentric-rod, the function and operation of which will presently be explained.

It will of course be apparent that when the wire is moved forward by the feed-rollers the movable cutter must be at its retracted position. As the wire is fed forward beyond the cutter-tube, (denoted by 24,) it passes into a receiver, 59, which is provided with a slot, 60, on its inner side. (See Figs. 8, 9, and 10.) The length of wire allowed for each bolt is regulated by means of an adjustable stop, 61, lying in a recess in the receiver, against which the end of the wire is forced as it is fed forward.

This stop is screw-threaded and is held against rotation by a key, 59 which engages agroove, 61, in the stop.

62 is a gear socketed in the receiver and provided with an internal screw-thread engaged by the thread on the stop which passes through it. Gear 62 is operated to move the stop either forward or backward by means of a gear, 63, carried by a shaft, 64. At the end of shaft 64 is a beveled gear, 65, engaging a corresponding beveled gear on a vertical shaft, 66. This shaft lies within a tube, 67, the upper end of which is slotted, and is engaged by a lock-nut, 68, which clamps the slotted end of the tube upon shaft 66,thereby locking it after adjustment. It will be seen that'rotation of the vertical shaft in either direction will act to move the stop in one direction or the other through the engagement of the beveled gears and gears 62 and 63, thereby determining the length of the blank allowed for each bolt. The operation of this adjustment will be apparent from the fact that gear 62, which engages the stop, being socketed in the receiver, is held against endwise movement and the stop is locked by groove and key against rotary movement.

69 (see Fig. 3) denotes a recess in slide 48, into which the receiver passes as the slide moves forward in the operation of heading.

The operation of the machine up to the instant the bolt is ready for heading is as follows: Having effected the necessary adjustments, as already explained, power is applied and the machine placed in operation. The wire is fed forward until the end strikes stop 61. The movable cutter carried by cross-slide 27 moves forward and severs the piece of wire in the receiver'i. 6., the blank from the main piece of wire. The blank when severed is held by the grippers and carried forward out of the receiver by the continued forward movement of the cross-slide, &c. At the instant the blank reaches the opening in the die the header begins to move forward and carries the blank into the die. The crossslide, block 26, &c., now move backward out of the way, the grippers springing over the blank as they pass backward, as is clearly illustrated in Fig. 7.

Turning now to Figs. 4 and 5, just back of heading-die 45 is a tube, 7 0, preferably made of chilled steel and held in an independent block, which is itself socketed in the die-block. This tube receives the bolt as it is fed forward. Back of tube 70 is a tube, 71, also socketed in the die-block, which receives the end of the bolt and also the reduced end 72 of a plunger, 73, which reciprocates in an opening, 7a, in the frame-work, and in a guide,

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75, bolted to the frame-work. Back of the plunger and in line therewith is an adj ustable stop, 76, carried by a slide, 77. This stop is screw-threaded and is held against rotation by a key, 7 7 which engages a groove. (See dotted lines, Fig. 5, in the stop.)

78 is a gear socketed in the slide and provided with an internal screw-thread engaged by the thread on the stop which passes through it. Gear 78 is operated to move the stop either forward or backward by means of a gear, 79, carried by a shaft, 80, and engaging gear 78. This shaft passes through the framework loosely enough so as not to interfere with the reciprocation of slide 77.

81 is a hand-wheel at the outer end of shaft 80, for convenience in adjusting the stop. The adjustment of this stop is substantially the same as the adjustment of the stop in the receiver. Gear 78 is socketed in the slide, so as to have no end wise movement, and the stop is keyed to the slide, so that it can have no rotary movement. It follows, therefore, that rotation of said gear must impart longitudin al movement to the stop.

82 is a block adapted to slide on the plun- 83 is a lever, one end of which is pivoted to I said block, its opposite end being pivoted to a link,v84, the opposite end of said link being pivoted to the legs. Lever 83 is provided with a pin, 85, and is connected to slide 48 by means of a rod, 86, pivoted on said pin. During the forward movement of slide 48 that is, in the operation of heading a boltblock 82 is carried backward, and when the return movement takes place it engages an enlargement or collar, 87, on the plunger and forces the latter backward, thereby expelling the headed bolt from tube and the headingdie, the completed bolts dropping down under the machine into a suitable receptacle. This position of the plunger and block 82 is shown in Fig. 3. Back of slide 77, lying in a recess, 88, in the frame-work, is an angleblock, 89. The rear end of this block is rounded and engages a corresponding recess, 90, in a block, 91, at the end of the machine. At the forward end of the angle-block and at the rear end of slide 77 are recesses 92, in which the ends of a toggle, 93, are socketed, the toggle being of course free to turn in both recesses. At the lower end of the angle-block is a roller, 94, which engages a cam-groove, 95, in a slide, 96, which reciprocates in suitable ways in the frame-work, said slide being held in position by a plate, 97, bolted to the frame-work.

98 is a rod made adjustable as to length in any suitable manner, one end of which is pivoted to slide 96, the other end being pivoted to the downwardly-extending arm 58 of eccentric-rod 57.

99 (see Fig. 4) is a cross-piece by which slide 77 is held in place, and 100 is a recess in the framework, which receives the enlarged portion of the slide in which the gears for adjusting the stop are placed, said recess being long enough to permit reciprocation of the slide, as will now be explained.

The operation of heading and expelling a bolt is as follows, (see diagram, Figs. 11, 12, and 13, in connection with Figs. 4 and 5:) At the instant that the severed piece of wire constituting a bolt-blank has been carried in front of the opening of the heading-die, as has already been explained, the header begins to move forward and forces the blank into the die, the inner end of the blank resting against the reduced end 7 2 of plunger 73, this reduced end being just the diameter of the wire from which the blanks are cut. The position of the parts at this instant is clearly shown in Fig. 11. The grippers now spring over the blank, as indicated in Fig. 7, and return to their normal position. sition of the parts illustrated is in Fig. 4, in which figure, however, the bolt is omitted for clearness of illustration.

It will be apparent that as the header moves forward, forcing the bolt into the die, the plunger will be forced. backward until it comes in contact with stop 76. At the instant the rear end of the plunger comes in contact with the stop the operation of heading will commence. As the body of the bolt is held firmly in the die and in tube 70 back of the die, it follows that the metal at the end of the blank outside of the die will be upset by the header, as is clearly shown in Fig. 12. In order to insure that the metal in being upset shall be made to completely fill the recess in the heading-die, thus forming a perfect head, and that the shank of the bolt shall not bind in the die, so that it may be readily expelled, no matter what may be the length of the bolt, I provide that at a certain. stage of the upset ting of the metal in forming the head of the bolt the stop itself, against which the plunger rests, shall yield sufficiently to allow the entire bolt and head to be forced farther forward, so that the metal shall be forced forward into the corner of the heading-recess,

as is shown in Fig. 13, thus forming a perfect head of any style. The position of the parts while the first portion of the upsetting of the metal of the head is being accomplished is clearly shown in Fig. 4. At the proper time, however, through the rotation of eccentric 55, arm 58 will be swung forward. This movement, through rod 98, will force slide 96 from the position shown in Fig. 4 to that shown in Fig. 5. This movement causes roller 94 to travel down into cam-groove 95, carrying the lower end of angle-block 89 downward, said block swinging on its pivotal point in block 91, which allows toggle 93 to yield, its forward end being carried downward, as shown in Fig. 5, which movement in turn permits slide 77, carrying the adjustable stop to move backward. This yielding of the stop will permit the whole bolt to move forward, and will carry the partiallyformed head clear down into the bottom of The next pothe head-forming recess in the die. The for- Ward movement of the header will continue until it comes virtually in contact with the die itself, as shown in Fig. 13.

It will of course be understood that in adjusting the machine the length of wire allowed for each bolt-blank and the portion of the stops are accurately adjusted, so that each head is formed perfectly, there being sufficient metal allowed to fill the headingrecess in the die. The return movements of the parts expel the headed bolt and place the parts in position to receive another blank from the grippers. As slide 48 moves backward, it of course swings lever 83 toward the position shown in Fig. 3. This carries block 82 against the collar on the plunger, moves the latter forward, and expels the bolt. The movement of eccentric 55, which returns slide 48 and the header to the position shown in Fig. 3, also swings arm 58 backward and draws slide 96 to the position shown in Fig. 4. This causes roller 94 to ride up the incline of cam-groove 95 and throws the angle-block, toggle, and slide 77 to the position shown in Fig. 5. \Vhen the parts have reached thisposition, the feed-rollers will have fed forward sufficient wire to form another blank, which will have passed into the receiver, been severed by the movable cutter, and carried forward by the grippers, ready to be forced into the die by the next forward movement of the plunger, these movements being continuously repeated at a high rate of speed, my improved construction being such that each head is formed perfectly, no matter how high the machine maybe speeded within reasonable limits.

It will of course be understood that the exact details of construction shown and described do not constitute the essence of my invention, as said details may be greatly varied without departing from the principles involved.

Having thus described my invention, I claim 1. The combination, with the feed-rollers, a tube for the wire, and cutter-tube 24, of receiver 59 and a sliding cutter acting between the receiver and tube 24 to sever the blank.

2. The combination, with the feed-rollers and a tube into which the wire passes, of receiver 5.), having an adjustable stop whereby the length of the blank is determined.

3. The combination, with the receiver, the cutter-tube, and the sliding cutter, of the feedrollers carried by shafts 10 and 11, a bracket to which shaft 10 is pivoted, and a set-screw whereby the pressure of the upperfeed-roller is regulated.

4. The combination, with the cutter-tube, sliding cutter, and grippers, of cross-slide 2, to which the sliding cutter is adjustably sccured, and slide 31, whereby the cross-slide is reciprocated.

5. Cross-slide 27, carrying the grippers, and slide 31, whereby said cross-slide is reciprocated, in combination with cross-head 36,conneeted to the cross-slide, rod 41, having a cheek-nut, lever 38, and spring 40, whereby the outward movement of the cross-slide and grippers is regulated.

G. The combination,with the cross-slide and the grippers, of cross-head 36, connected to the cross-slide, a lever pivoted to the crossslide and to a link, 3.), a spring acting to draw the cross-slide and cross-head outward, and a rod, 4-1, passing through the cross-head and having a nut at its outer end, whereby the outward movement of the cross head and slide is limited, as and for the purpose set forth.

7. The combination, with tube 24., the crossslide, and the grippers, of the crosshead connected to the crossslide, lever 38, link 39, spring 40, and rod ell, passing through the cross-head and having a nut, 41, whereby the outward movement of the cross slide and cross-head is adjusted, so that in the outward movement the grippers will stop at the exact position required to receive the wire from tube 2%.

S. The combination, with the cross-slide, block 26, having arms 26, and the grippers, of screws 28, engaging the cross-slide and having a collar engaged by said arms, whereby the grippers may be moved in or out relatively to the cross-slide, and a check-nut for locking the parts in position after adjustment.

9. The combination, with the heading-die, the crossslide, and block 26, carrying the grippers, of screw 28, engaging the cross-slide and having a collar engaging said block, whereby the grippers may be adjusted relatively to the cross-slide, so that after forward movement the grippers will stop with the blank exactly before the recess in the heading-die.

10. The combination, with the header, heading-die, cross-slide, grippers, cutter 25, and tube 24, of screw 28, engaging the cross-slide and connected to the grippers, cross-head 36, acting to draw the cross-slide outward, and an adjustable stop to limit the outward movement of the cross-slide, whereby the grippers may be so adjusted as to receive the end of the wire in the outward movement and to leave the severed blank in front of the die in the inward movement.

11. The combination, with tube 24: and the receiver, of block 26, the grippers, and the cross-slide to which the block is adjustably secured.

12. The combination, with the heading-die and a receiver having an adjustable stop, of the cutter-tube and the cross-slide carrying cutter 25, and the grippers, whereby the length of the blank is determined .and the severed blank is carried in front of the die.

13. The combination, with the cutter-tube and the crossslide, of block 26, cutter 25, and the spring-grippers secured to the block and provided with steel dies 44:.

1a. The combination, with the heading-die and header, of tube24, the cross-slide, block 26, carrying cutter and spring-grippers, and means, substantially as described, for adjusting said block relatively to the crossslide and for adjusting the outward movement of the cross-slide.

15. The combination, with the cutter-tube, sliding cutter, and the grippers, of receiver 59, into which the end of the wire passes, and an adjustable stop in said receiver which de termines the length of the blank.

16. The combination, with the cutter-tube, sliding cutter, and grippers, ofthe receiver having a slot, 60, through which the severed blank is carried by the grippers.

17. The combination, with the cutter-tube, sliding cutter, and the grippers, of the re ceiver having slot 60, adjustable stop 61, and mechanism, substantially as described, whereby the stop may be adjusted and locked in position after adjustment.

18. The combination, with the receiver having a key, 59, and a threaded stop having a groove engaged by said key, of gear 62, which is socketed in the receiver and internally threaded to engage the stop, and means, substantially as described, for rotating said gear to adjust the stop.

19. The combination, with the receiver,.

threaded stop 61, andinternally-threaded gear 62, engaging said stop, of shaft 64, having a bevel-gear, 65, and a gear engaging gear 62, a vertical shaft having a bevel-gear engaging gear 65, a tube inclosing the vertical shaft and slotted at its upper end, and a lock-nut which clamps the slotted end of the tube upon the vertical shaft to lock the parts in position after adjustment.

20. The combination, with the receiver, the cutter-tube, the sliding cutter, and the grippers, of headingdie 45 and the header.

21. The combination, with the heading-die and header, of the cutter-tube, the receiver, the sliding cutter, and the grippers, whereby the blank is severed and carried forward ready to be forced into the die by the header.

22. The combination, with the heading-die having a recess in which the bolt-head is formed and the header, of plunger 73, having a reduced end corresponding in diameter with the blank, a stop, 7 6, and a train of mechanism, substantially as described and shown, which permits said stop to yield in the formation of a bolt-head, so that in upsetting the metal it is forced into the forward portion of the recess in the heading-die.

23. The header, slide 48, and eccentric-rod 57, in combination with the plunger, stop 76, and a train of mechanism, substantially as described and shown, which permits said stop to yield in the formation of each bolt-head, as and for the purposeset forth.

24. The header, slide 48, and eccentric-rod 57, in combination with the plunger having a collar, 87, block 82, which slides on the plunger, and connecting mechanism, substantially as described,between said block and slide 48,

whereby in the return movement said slide engages collar 87 and forces the plunger backward to expel the headed bolt.

25. The combination, with the slide, header, heading-die, and the plunger having collar 87, of block 82, sliding on the plunger, lever 83, pivoted to said block and to a link, 84, and rod 86, connecting said lever with the slide, as and for the purpose set forth.

26. In a bolt-heading machine, the combination, with slide 48, eccentric-rod 57, the header, heading-die, and plunger, of stop 76 and a train of mechanism, substantially as described and shown, which permits said stop to yield at predetermined times, as and for the purpose set forth.

27. The combination, with the header, heading-die, and plunger, of threaded stop 76, slide 77, carrying said stop, and gearing, substantially as described, for adjusting the stop in the slide.

28. The combination, with the heading-die, the header, and plunger 73, of slide 7 7 having a key, 7 7, a threaded stop in said slide having a groove engaged by said key, gear 78, socketed in the slide and internally screwthreaded to engage the stop, and means, substantially as described, for rotating said gear to adjust the stop in or out.

29. The combination, with plunger 73, slide 7 7, and adjustable stop 7 6, of angle-block 89 and toggle 93.

30. The combination, with the header, heading-die, and plunger, of threaded stop 7 6, slide 7 7, internally-threaded gear 7 8, which is engaged by the stop and is socketed in the slide, and shaft 80, carrying a gear engaging gear 78, whereby the stop may be adjusted.

31. The combination, with the header, headingdie, plunger, and stop 7 6, of slide 7 7, by which the stop is carried, swinging angleblock 89, and toggle 93, engaging the slide and angle-block, whereby the slide is permit-.

ted to yield backward at a predetermined time.

32. The combination, with the eccentricrod having downwardly-extending arm 58, the header, heading-die, plunger, and slide 7 7, carrying a stop, of angle-block 89, toggle 93, engaging the angle-block and slide 7 7, slide 96, having a cam-slot engaged by the angleblock, and a rod connecting slide 96 with arm 58.

33. The eccentric-rod having arm 58, the header, plunger, and slide 77, having a stop, in combination with angle block 89, hav ing a roller, 94, toggle 93, engaging slide 77 and the angle-block, slide 96, having a camgroove engaged by said roller, and a rod connecting slide 96 with arm 58,-whereby at a certain stage of the heading of a bolt slide 77, carrying the stop for the plunger, is allowed to yield, so that the blank is forced farther backward and a perfect head is formed without danger of binding in the die.

34. The combination, with the eccentric-rod having downwardly-extending arm 58, slide IIO 4-8, the header, die, and plunger, of slide 7 7, carrying a stop, angle-block 89, toggle 93, slide 06, engaged by the angle-block, and an adjustable rod, 98, connecting slide 96 with arm 58.

35. The combination, with the plunger, of slide 7 7, carrying an adjustable stop, and mechanism-for example, an angle-block, toggle, and slide-which permits the stop to yield at a predetermined time.

36. The con'ibination, with the plunger, of slide 77, recessed in the frame-work, internally-threaded gear 78, recessed in said slide, threaded stop 7 (i, engaging the gear, and a shaft carrying a gear engaging gear 7 8, whereby the stop may be adjusted.

37. Ina bolt-heading machine, the combination, with slide 7 7, carrying stop 7 ('5, of angle-bloek 89, carrying roller 9i, toggle 93, engaging the angle-block and the slide, and a slide, ()6, having a cam-slot engaged by said roller.

38. The fl'ftlllG-WOJk having recess 100, the stop 76, and slide 77, lying partly Within said recess, in combination with the angle-block, toggle, and slide 96, whereby the slide and stop are held firmly during the first portion of the operation of heading and are then allowed to yield, as and for the purpose set forth.

39. The eccentric-rod, slide 48, the header, die, and the plunger having a collar, 87, in combination with block 82, through which the plunger slides, lever 83, pivoted to the block and to link 84, and an adjustable rod connecting lever 83 with slide 48, whereby the throw of the plunger in expelling the headed bolt may be regulated.

In testimony whereof I affix my signature in presence of two witnesses.

ELLVVOOD BURDSALL, JR.

VVitn esses:

A. M. WoosTER, A. B. FAIROHILD.