US1783796A - High-speed thread-rolling machine - Google Patents

Description

Dec. 2, 1930. J. A. KlNNEY HIGH SPEED THREAD ROLLING MACHINE Filed June 28, 1928 5 Sheets-Sheet l l Dec. 2, 1930. J. A. KINNEY HIGH SPEED THREAD ROLLING MACHINE Filed June 28, 1928 5 Sheets-Sheet 2 Dec. 2, 1930. J. A. KINNEY l1,733,796

HIQH SPEEVD THREAD ROLLING MACHINE Filed June 28, 1928 5 Sheets-Sheet 3 INVENTOR JameSA BY ff@- Dec. 2, 1930. J. A. KINNEY v HIGH SPEED THREAD ROLLING MACHINE Filed June 28, 192e `Sshaets-sheet 4 Dec. 2, 1930. J. A. KINNEY 1,783,796

HIGH SPEED THREAD ROLLING MACHINE Filed June 28, 1928 5 Sheets-Sheet 5 INVENTOR ATTORNE Patented Dec. ,2, 1930 UNITED STATES PATENT OFFICE JAMES A. KINNEY, 0F LEBANON, PENN-BYLVA'NIA, ABSIGNOB T0 `BEIHLEEEH STEEL COMPANY HIGH-SPEED THREAD-ROLLING mcnnm Application led June 28,

My invention relates enerally to a machine for rolling threads on bolt blanks, screws,v rods and the like either hot or cold, and is more especially adapted for rolling threads on bolt blanks at high speed.

One of the objects of my invention is to eliminate two and in some cases three single stroke thread rollers each operated by a man placing a bolt or the like between the dies,

or to the feeder for the dies with tongs as the blank comes from the header.

Another objectof my invention is to have a pluralit of sets of dies arranged in longitudinal alignment and to feed the bolt blank to each set of dies from a single source of sup ply such as a chute, magazine or hopper.

Another object of my invention resides in feeding the bolt blank from a single source of supply and to form a threaded bolt both on the forward and return stroke of the movable dies.

Another obj ect of my invention relates to the adjusting means for the blank starter whereby the length of the stroke of the start er may be varied either as to the length of the path of the arc-shaped swinging stroke, and also as to the length of the stroke of the starter on each side of the center line ofthe chute in order to feed the blank between the dies to the desired position.

Another object of my invention relates to the mechanism for feeding intermittently the bolt blank to the starter in a processional order from a single source of supply.

Another object of my invention relates to the adjustable and swivel connections of the rod which connects the slide mounted on the lever for holding the starter and the rocker arm. f

My invention will be more readily understood by reference to the accompanying five sheets of drawings forming a part of this specification in which Figure 1 is a top plan view of the machine embodying my invention;

Figuref2 is a front elevation;

Figure 3 is a rear elevation;

Figure 4 is a top plan view of the main portion of the machine showing the recipcocating and stationary dies, the feeding and 1928. Serial No. 289,000.

starting and other actuating mechanism therefor drawn on a larger scale;

Figure 5 is a detail front elevation of the blank starter;

Figure 6 is a transverse section taken on the line 6-6 of Figure 4;

Figure 7 is a detail top plan view of the blank feeding mechanism drawn on a larger scale to more clearly show the manner of construction;

Figure 8 is a detail view of the swivel block which is mounted upon the slide on the lever for holding the starter;

Figure 9 is a transverse section through the lever for holding the starter and slide mounted thereon, illustrating the manner of attaching the connecting rod thereto;

Figure 10 is a vertical transverse section through one of the friction ily wheels;

Figure 11 is a detail of the bolt through thel head of which the tension rod passes mounted on the arm which'carries the roller for engaging the cam for actuating the starter; A

Figure 12 is a detail view illustrating the manner of attaching the tension rod to the side of the machine Figure 13 is a detail viewi illustrating the -double cam and the lever connection for operating the V-blank feeder;

Figure 14 is a detail view of the rocker arm and connection for the rod for the blank starter; and

Figures 15 and 16 are details of the top of the rocker arm illustrating the adjustable colnection between same and the connecting ro Referring now to the various characters of reference on the drawings in detail, the nu- `ing the movable platen dies 12 and 13. These movable dies 12 and 13 are vertically and adjustably support-ed b means of liners or wedges 14 as indicate in Fig. 6, and further serum-d in position by means -of clamps 15 and bolts 16 at the top sides and. at their outer ends by set bolts 17 which also hold the outer ends of the movable die blocks l0 and ll, the inner ends of said die blocks engaging a dove-tailed projection 18 formed centrally on the face of the cross-head, between recesses 8 and 9.

Stationary platen dies 19 and 20 are mounted opposite the movable dies and are held by the die-blocks 2l and 22 which are attached to the front extensions 4 and 5 by means of clamps 23 and 24, at the top and between the abutments 25 on each of the inner ends of the stationary die-blocks, and clamps 26 secured by bolts 27 at the outer ends thereof. These stationary die-blocks are held adjustable in position by means of vertical through bolts 28 and clamps 29 having bolts 30 and transverse set bolts 31.

A channel 32 is formed transversely of the bed plate 1, between the front extensions 4 and 5 in which is mounted a bracket 32, having a lower horizontal base portion 33 vertical sides 34. having at their intermediate points outwardly extending flanges 35 attached to the top of the extensions 4 and 5. The upper ends of the sides 34 are inclined and have adjustably attached thereto guide bars 36 forming a chute or magazine for receiving the blanks 37 from the headers to the threading machine in any approved manner, as by means of a belt conveyor (not shown). The blanks 37 are fed intermittently in sequence from the chute 36 into the passage 38 at the lower end of the chute which extends into a bifurcated arc-shaped trough extension 39 formed integral with the bracket 32 at its inner end where they are engaged by the starter 40 for pushing the blanks to the dies. As the blanks 37 are received in the chute the heads of the blanks engage the top inclined face of the chute and slide downwardly thereon by gravity in order to feed the blanks into the arc-shaped trough extension so it may be advanced by the starter into the dies in sequence and at proper intervals, I provide a separating and feeding device comprising a lever 41 pivoted centrally at 42 to a cross web 43 of the bracket 32. The forward end of the lever 41 has a beveled face 44 and a catch 45 against which the advancing blanks normally engage and is held until the lever is oscillated. The rear end of the lever 41 is bifurcated at 46 to receive a sliding block 47 perforated centrally to receive a pin 48 which is secured at one end to the sliding bar 49 mounted in a keeper attached to the extension 5 of the front bed plate 1. The opposite end of the sliding bar 49 being coupled as at 50 to the connecting rod 51. This rod extends through a supportingvbracket 52 at an intermediate point,

while the opposite end is screw threaded and coupled to a lever 53, which is pivoted at its lower end by means of a bolt 54 to they base plate 2. The lever 53 carries an idler roller 55 engaging a double cani 56 adj ustably secured to the end of cam-shaft 57 by means of clamping keys 58 which allows` the cams to be set in any desired position around the cam-shaft and then held by means of set-bolts 59. To vary the pressure of the idler roller on the cams 56 and to return the catch lever 41 to its normal position, a helical spring 60 is interposed on the threaded end of the rod 51 between the bracket 52 and nut 61. Nuts 62 on the rod 51 engage the other side of the bracket 52 to limit the movement of the rod in the opposite direction. As the roller passes over each of the cams 56 it retracts the catch on the inner end of lever 41 thereby releasing a blank and allowing it to be fed by gravity into the arc-shaped extension of the trough 39. As the roller passes off each cam the catch is returned to its normal position by means of the return action of the spring 60 while the beveled face 44 on the end of the lever further forces the blank into the desired position in the bifurcated arc-shaped trough extension to insure the starter 40 to engage the blank and carry it into the required position it will assume between the dies for the beginning of the threading operation. In this manner two blanks are fed to the arc-shaped trough at each rotation of the cam-shaft 57.

The cross-head 7 which reciprocates in theV slide-ways 6 has a vertical extension 63 formed integral therewith having horizontal adjustable bottom liners 64, and vertical liners between the back face of the crosshead and the upwardly extending back portion 3 of the front base-plate 1.

A cap plate or binder 66 of inverted channel shape having downwardly extending flanges 67 and 68 is mounted and adjustably secured to'the top of the back portion 3 by means of bolts 69 at the top andon one side by set bolts which extend through flange 67. The opposite flange 68 engaging the extension 63 is formed on the cross-head 7. By adjusting the bolts 69 and 70 any loose play between the cross-head 7 and the liners 64 and 65 may be taken up or adjusted as will be readily understood by referring to Figs. 4 and 6 of the drawings.

A starter lever or holder 71 has a hub 72 at one end which is pivoted near the center of the top of the cap-plate or binder 66'by means of a stub-shaft 72', the lower end of which is screwed into the binder 66 while the upper end has a washer and nut for holding the hub 72 of the starter lever or holder. The opposite end of the starter lever or holder 71 being formed at right angles to the body of the lever as at 73 and extends downwardly over the arc-shaped trough`39 having a grooved face as at 74 for receiving .rin

the shank of the starter 40 and adjustabl secured thereto by means of bolts whic have through slots 76 in the shank of the starter and secured to the member 73. The lower portion or head 77 of the'starter is wider than the shank and is adapted to extend into the arc-shaped trough39 and engage the blanks in the forward and backward stroke of the reciprocating "cross-head 7. In order to vary the throw of the starter a slide holder 78 is mounted on top of the starter lever 71, formed with a slide-way 79 and pivoted at one end as at 80 to the hub 72, the opposite end having a projection formed w1th an arc-shaped slot 81 through which extends a 'clamping bolt, and a lug 82 having a threaded opening 83 for receiving a set bolt 84. This threaded set bolt 84 is squared at its outer end for receiving a wrench for adjustment and has a head 85 formed on its inner end for engaging a T- slot 86 in the outer end of a slide 87. A bearing bracket 88 is attached to the top of the slide by means of bolts and between the bearing bracket and the slide is mounted a block 89, slotted centrally asl at 90, having trunnion projections 91 and 92 at the top and bottom and journaled in openings l93 and 94 formed in the bearing bracket and slide respectively. The opposite sides of the block 89 in line with the slot is made concaved as at 95 for engagin 97. rod 98 having a screw thread end passes through the washersv 97 and slot 90 having nuts near the end for engaging the side of one of the washers and is held resiliently on the other side of the block by means of a helical spring 99 and adjustable nuts 100. The opposite end of the rod is adjustably attached to the rocker arm 101 by mea-ns of a ball and socket connection comprising a journal box 102 through which passes a bolt 103 extending lthrough a ball shaped bushing 104. The bolt 103 has a head 105 engaging a slide-way 106 formed near the upper end of the rocker arm. A projecting lug 107 is formed on the upper end of the rocker arm having an openingv therein as at 108 through which passes an adjusting bolt 109 squared at its upper end to receive a Wrench for adjustment` and having a collar 110 at an intermediate point to engage the bottom face of the lug 107 and nuts 111 for holding the bolt in adjusted position.' `The lower end of the vadjusting bolt 109 being screw threaded as at 112 to engage the threaded opening 113/in the head 105 of bolt 103, in this manner by the rotation of the adjusting bolt 109 the stroke of the rocker maybe made longer orpshorter as desired.

The rocker arm is keyed to shaft 114 which is journaled in a bracket 115. This shaft also has a downwardl extending lever 116 connected by means ofY a link 117 to another lever 118 keyed to a shaft 119 journaled in the convex inner sides 96 of washers' bracket 120. On the opposite end of said shaft 119 is keyed lever 121 carrying the cam roller 122 or engaging the single cam 123 adjustably mounted on cam shaft 123. The roller 122 on lever 121 is resiliently held on the caln by means of a tension device comprising a tension bar 124 pivoted to the rear base plate 2 by means of a bracket 125 as indicated in Fig. 12, from which said tension bar extends upwardly through a hole 126 in the head of a bolt 127 which is attached to the lever 121. The upper end of the tension bar is screw threaded to receive nuts 128 between which and the head of bolt 127 is interposed a. helical spring 129. When the cam roller 122 mounted on the end of the lever 121 is on the raised ortion of the cam 123 the slide-holder 78, older 71 and starter 40 are in the position indicated in Figs. 1 and 3 of the drawings, but after the cam roller 122 passes over the raised portion and engages the smaller diameter of the cam the holder 78 with the parts mounted thereon will be swung in the, opposite direction by means of the pressure of the spring 129 exerted on the lever 121.

As the bolt blanks or the like are fed to the dies in rapid succession they sometimes become jammed between the dies either by getting out of proper position or from some other cause and when this occurs it is necessary to automatically stop the operation of the machine to prevent breakage. This is done by mounting on the main drive shaft 130 at each end thereof friction fly wheels 131, the hubs 132 of which are keyed to the drive shaft. These hubs are formed each with a friction disk 133 and a coacting friction disk 134 keyed to the hub 132 by means of hook shaped keys 135. These friction disks 133 and 134 engage fiber washers 136 and are resiliently held together by means of bolts 137 which pass through the disk and have spring 138 interposed between washers 139 and the side of one of the disks as will be clearly understood by referring to Fig. 10. In this manner when a blank becomes jammed between the dies the operation of the machine will be stopped by allowing the rim and body of the friction fly wheels to rotate between the then stationary friction disks forming the hubs of the wheels.

Mounted centrally on the main drive shaft 130 is keyed -a pinion 140 which is wide enough to engage a pair of spaced crankdisk gear wheels 141 and 142 keyed to the inner ends of the cam shafts 57 and 123 and f connected'together by means of a crank pin reciprocating cross-head.

Frequently after being rolled the bolts or like articles have a tendency to hold onto the dies and in order to insure their being ejected from the dies I provide kickers 146 pivoted bv means of bolts 147 to the movable die holders 10 and 11, each having a cam 148 at one end for engaging stationary shifter blocks 149 and 150 which are preferably adjustably attached to the flange 68 of the binder 66 thereby rotating the arm of one 'of the kickers into engagement with the follows, referring more particularly to Figs.

1, 2, 3, 4, 6 and 7 Assuming that the parts of the machine are in the position indicated and that power has been applied to the main drive shaft 13() in any approved manner as by means of a belt on one or both of the frict-ion fly wheels 131 connected to a motor (not shown) thereby rotating the pinion 140, cam disk gears 141 and 142 mounted on cam shaft 57 and 123', upon which double cams 56 and single cam 123 are mounted and .reciprocating the cross-head 7 which carries the dies 12 and 13 bv means of the connecting rod 144 and pivotal connections 143 and 145, and bolt blanks 37 or the like having been fed between the guide bars 36 forming the chute as indicated in Fig. 7, which indicate the beginning of the forward stroke of the cross-head 7. One blank having been pushed by the starter 40 between dies 12 and 19 into position to be threaded, while the forward blank in the chute 36 is about to be released therefrom bv means of the catch 45 through the action of one of the double cams 56 over which the idler roller 55 is about to pass as illustrated in Fig. 2. The cross-head 7 reciprocates forward thereby forming a thread on the bolt blank 37 until it reaches the end of the working stroke when it is ejected from the machine by means of the kicker 146 the cam end 148 of which engaging the shifter block 149.. As the crosshead 7 reciprocates forward, the starter 40 remains stationary for a portion of the length of the working'stroke as the single cam 123 at the beginning of the stroke is in the position indicated in Fig. 3 of thedrawings.

While the starter 40 remains stationary the rotation of the double cam 56 actuates the catch 45 and releases the forward blank 37 in the chute 36 and allows it to be projected into the arc-shaped trough extension 39. By the time the cam roller 55 has passed over one of the raised portions of the double camv 56, cam

roller 122 will have about passed over the raised portion of the single cam 123, and as it passes olf and onto the inclined surface of said cam, the starter 40 is actuated in the opposite direction by means of the pressure of spring 129 exerted on the lever 121 thereby pushing the blank just received from the chute 36 by the bifurcated trough extension 39 into position between the dies 13 and 20. The cross-head 7 then reciprocates backward to the end of the working stroke or until the blank is threaded and then ejected from the dies of the-machine by means of the cam end 148 of the other kicker 146 engaging the stop block 150 mounted on the stationary binder In the meantime during the backward movement of the cross-head 7, as the cam shaft 57 and 123' carrying cams 56 and 123 continue to rotate, the starter 40 will remain stationary for a portion of its stroke as the cam roller 122 will engage the smaller diameter of the single cam 123, and until the other raised cam surface of the double cam 56 retracts the catch 45 and delivers another blank 37 to the bifurcated trough extension of the chute. The operation above described is then repeated.

It will be noted that the starter 40 is operated by the single cam 123 near the end of each working stroke ofthe cross-head 7, and is adapted to project the blank in the opposite directon to the movement of said cross head, the operation or feeding of the blank taking place while the cam roller 122 engages the inclined portions of the cam, and that the starter remains stationary when the roller engages the larger and smaller diameters of the said cam, and during these intervals when the starter 40 is stationary the catch45` is actuated by means of the double cam 56 to feed a blank into the bifurcated trough extension 39 from the chute 36.

Although I have described and illustrated my invention in considerable detail, I do not wish to be limited to the exact and specificdetails thereof as shown and described. but may use such modifications in, substitutions for, or equivalents thereof, as are embraced within the scope of my invention, or as pointed out in the claims. l f

Having thus described my invention, what I claim and desire to secure by Letters Patent 1s:

1. In a thread rolling machine, the combi nation with a plurality of longitudinally aligned stationary dies, a plurality of longitudinally aligned reciprocating dies mounted opposite the stationary dies, means for feed# ing blanks to the dies in one direction from a single source of supply, while the reciprocating dies are travelin in the reverse direction and means adapte to form a thread on` a blank by each stroke of the reciprocation of the movable dies.

2. In a thread rolling machine, the combination with a pair of longitudinally aligned stationary dies, a plurality of longitudinally aligned reciprocating dies mounted opposite the stationar dies, means for intermittently feeding blan s in opposite directions to the dies from a single source of supply, means for feeding blanks to the dies in one direction while the reciprocating dies are travelin r in the reverse direction and means adapte to form a thread on a blank on each forward nd backward stroke of the reciprocating les.

3. In a thread rolling machine, the combination with a pair of longitudinally aligned stationary dies, a pair of longitudinally aligned movable dies ada ted to reciprocate opposite the stationary ies and means for feeding blanks to the dies in one direction while the movable dies are traveling in the reverse direction.

4. In a thread rolling machine, the combination with a pair of longitudinally aligned stationary dies, a pair of longitudinally aligned movable dies adapted to coact and reciprocate opposite the stationary dies vand means for intermittently feeding blanks to the dies in sequence whlle the movable dies are traveling in the reverse direction.

5. In a thread rolling machine, the combination with a pair of longitudinally aligned stationary platen dies, a pair of longitudinally aligned movable platen dies adapted to coact and reciprocate opposite the stationary dies, and means for intermittently feeding blanks from a single source of supply to the dies in sequence at each forward and backward stroke of the reciprocating dies.

6. In a thread rolling machine, the combination with v a pair of longitudinally aligned stationary dies, a pair of longitudinally aligned movable dies adapted to coact and reclprocate opposite the stationary dies, friction driving means mounted on the main drive shaft for reciprocating the movable dies, and means for intermittently feedin blanks to the dies in sequence.

g. In a thread rolling machine, the combination with a pair of longitudinally aligned stationary dies, a pair of longitudinally aligned movable dies adapted to reciprocate opposite the stationary dies, a single source o supply for both pairs of dies, and adjustable means for feedlng blanks to the dies in sequence.

8. In a thread rolling machine, the combination with a pair of longitudinally aligned stationary dies, a pair of long1- tudinally aligned movable dies adapted to reciprocate opposite the stationary dies, and a blank feeding device mounted between the stationary dies adapted to feed blanks to both sets of dies.

9. In a thread rolling machine, the combination with a pair of longitudinally aligned stationary dies, a pair A of longitu inally aligned movable dies mounted in a cross-head and adapted to reci rocate oppolsite the stationary dies, a blan feeding device mounted between the stationary dies,'and a starter ada ted to ro'ect the blanks to both sets of ies on tllfe forward and backward stroke of the cross-head.

10. In a bolt thread rolling machine, the combination of a pair of longitudinally aligned stationary dies, a air of longitudinally aligned movable dies adapted to reciprocate opposite the stationar dies, a bolt blank fee ing device mounte between the stationary dies adapted to feed blanks to both sets of dies from a single chute, and kickers traveling with the movable dies for ejecting a threaded bolt at the end of each stroke of the movable dies.

11. In a thread rolling machine, the combination with a pair of stationary dies, a pair of movable dies coacting with the stationar dies, a chute for receivin blanks and a fee ing device adapted to eed blanks to both pairs of dies.

12. In a thread rollin machine, the combination with a air o stationary dies, a pair of movable ies coacting with the stationary dies, a chute for receiving headed blanks, and means ada ted to feed blanks from the chute in opposite directions to each pair of coacting dies.

13. In a bolt thread rolling machine, the combination with a pair of stationary dies, a

pair of movable dies coacting with the sta-v tionary dies, a chute for receivin headed blanks, means for feeding blanks rom the chute in opposite directions to each pair of coacting dies in sequence, and means for ejecting the thread bolt from the machine.

14. In a thread rolling machine, the combination with a pair of longitudinally aligned stationary dies, a pair of longitudinally aligned movable dies coacting with the stationary dies, a chute for receiving headed blanks, and means for feeding blanks from the chute in sequence in both directions longitudinally of the machine to each pair of coacting dies.

15. In a thread rolling machine, the combination with a pair of longitudinally aligned stationary dies, a air of coacting longitudinally aligned mova ledies mounted in a cross-head opposite the stationary dies, means for reciprocating the cross-head, a chute mounted between the stationar dies for receivingA blanks to be thread and means for feeding blanks from the chute to the dies on the forward and backward stroke of the reciprocating cross-head.

16. In a thread rolling machine, the com bination with a plurality of longitudinally4 ali ed stationary dies, a plurality of coacting longitudinally aligned moveable dies mounted in a cross-hea opposite the stallU tionary dies and adapted to coact therewith,

a chute attached to the base frame between the stationar dies having a bifurcated arcshapcd troug 1 extension, means for feeding blanks from the chute to the bifurcated arcshapcd extension, and a starter for engaging the blank in the bifurcated arc-shape extension adapted to deliver a blank to a pair of dies on the forward and backward stroke of the cross-head.

17. In a thread rolling machine, the combination with a chute ada ted to receive headed blanks having a bi urcated trough extension, a catch for enga 'ng the foremost blank in the chute, means or retracting the catch to allow the foremost blank to be fed into the bifurcated trough extension, means for projecting the catch to engage the following blan aligned stationary dies and a pair of reciprocating longitudinally aligned movable dies mounted in a cross-head and adapted to coact with the stationary dies, and a starter extendin into the bifurcated trough extension or engaging the blank and to advance it to a palr of coacting dies on the forward and backward stroke of the cross-head.

18. In a thread rolling machine, comprising a pair of stationary dies and a pair of reciprocatin dies, a chute having a bifurcated extension adapted to receive headed blanks, adjustable means for feeding blanks from the chute to the bifurcated extension in sequence, and an adjustable starter adapted to engage the blank and advance them between a pair of dies on each forward and backward stroke of the movable dies.

19. In a thread rolling machine, compris- 'ing a pair of stationary dies and a pa1r of reciprocating dies, a chute havin a bifurcated extension, for receiving lanks, a starter adapted to engage the blanks and advance them between a pair of dies on each forward and backward stroke of the movable dies, and adjustable means adapted to vary the throw of the starter on each side of the chute.

20. In a thread rolling machine, comprising a pair of stationary dies and a pair of coacting reciprocating dies, a chute having an arc-shaped bifurcated trough extension for receiving blanks to be threaded, a starter pivotally mounted adapted to engage the blanks and advance them between a pair of dies on each forward and backward stroke of the movable dies, adjustable means adapted to vary the movement of the starter and adjustable means for varying the movement of the starter on each side of the chute.

21. In a thread rolling machine, comprising a pair of stationary dies and a pair of reciprocating dies, a chute having a bifurcated trough extension for receiving blanks, means for feeding blanks from the chute to a pair of longitudinally maar the bifurcated trough extension, a starter pivotally mounted extendin into the bifurcated trough extension an( adapted to engage a blank and advance it between a pair of dies on each forward and backward stroke of the movable dies, actuating mechanism for the starter, means for adjusting the movement of the starter, means for adjusting the movement of the starter on each side of the chute, and a flexible connection between the starter and the actuating mechanism for imparting a swinging movement to the starter in one direction.

22. In a thread rolling machine, the combination with a pair of reciprocating dies, a pair of stationar dies mounted opposite the reciprocatin dies and coacting therewith, a chute or receiving blanks to be threaded having a bifurcated trough extension. a catch adapted to engage the foremost blank in the chute, means for retracting the catch to allow the foremost blank to advance into the bifurcated trough extension, means for projecting the catch to engage and retard the following blank, and a starter for pushing the blanks in the bifurcated trough extension in opposite directions for each pair of coacting dies on the forward and backward stroke of the cross-head.

23. In a thread rolling machine, the comu trough extension, a connection between the pivoted lever and the cam, resilient means for projecting the catch to engage and retard the following blank, and a starter for pushingthe blanks in the bifurcated trough extension in opposite directions for engagement with each pair of coacting dies on the Iflorwfard and backward stroke of the cross- 24. In a thread rolling machine, the combination with a pair of longitudinallv aligned reciprocating dies mounted in a cross-head` a pair of stationary dies mounted opposite the reciprocating dies and coacting therewith, a chute for receiving headed blanks to be threaded having a bifurcated trough extension, a lever pivoted centrally between the stationary dies having a catch at one end adapted to engage' the foremost blank in the chute, a sliding connection formed at the opposite end of the lever, a rotatably mounted double cam, an idler roller for engaging the double cam mounted on a lever pivoted to the base plate, a rod connection between said lever and the sliding connection, means for rotating the double cam to actuate the rod connection to retract the catch and'allow feeding of the blanks, means resiliently mounted on the rod for projecting the catch to engage and retard the feeding of the blanks, and a starter for pushing the blanks in the bifurcated trough extension alternately in opposite directions for engagement with each pair of 'coacting dies.

25. In a thread rolling machine, the combination with 'a pair of longitudinally aligned stationary dies, a reciprocating crosshead, a pair -of longitudinally aligned dies mounted in the cross-head and adapted to reciprocate opposite the stationary dies, a chute for receiving headed blanks having a bifurcated extension for receiving blanks from the chute in sequence, mounted between the stationary dies,.a lever pivoted centrally on the machine having a catch at one end adapted to engage or release the foremost blank in the chute, a double cam, a rodl having a sliding connection between the double cam and lever, and a starter in the bifurcated extension adapted to push the blanks fed to the bifurcated extension in the opposite di rection to the movement of the reciprocating cross-head.

26. In a thread rolling machine, the combination with a plurality of longitudinally aligned stationary dies, a reciprocating crosshead having a plurality of dies mounted thereon and adapted to coact and reciprocate opposite the stationary dies, a chute for receiving headed blanks having a bifurcated extension mounted between the stationary dies, means for feeding blanks from the chute to the bifurcated extension in sequence, a starter adapted to engage the blanks in the bifurcated extension and advance them between a pair of dies in the opposite direction to the movement of the reciprocating cross-head, a cam for actuating the starter in one direction and resilient means for actuating -the starter in the opposite direction.

27. In a thread rolling machine, comprising a pair of longitudinally aligned stationary dies and a pair of longitudinally aligned movable dies coacting therewith a chute for receiving headed blanks having a bifurcated extension, means for feeding blanks from the chute to the bifurcated extension, a starter mounted on a swinging lever for engaging the headed blanks in the bifurcated extension, an adjustable slide on the swinging lever, a rotatably mounted cam for actuating the swinging lever in one direction, a rod connection between the adjustable slide and cam, and resilient means for actuating the swinging lever in the opposite direction.

28. In a thread rolling machine, comprising a pair of longitudinally aligned stationary dies and a pair of longitudinally aligned movable dies mounted on a cross-head coacting therewith, a chute for recei/ving headed rblanks having a bifurcated extension, means the length of the stroke of the starter, means for adjusting the slide to vary the stroke of the starter on each side of the center line of the chute, a rotatably mounted cam for actuating the swinging lever in one direction, connections 'between the camand the swinging lever, and resilient means for swinging the lever in the opposite direction to that given by the cam.

29. In a thread rolling machine, the combination with al pair of stationary dies, a pair of movable dies mounted in a cross-head and coating with the stationary dies, a chute for'receiving blanks having a bifurcated extension, means for feeding blanks from the chute to the bifurcated extension, an adjustable starter mounted on a pivoted swinging lever for engaging the headed blanks in the bifurcated extension and adapted to deliver a blank between a pair of coacting dies on each stroke of the reciprocating cross-head, a slide mounted on the swinging lever, means for adjusting the slide to vary the length of the stroke of the starter, means for adjusting the slide to vary the stroke of the starter 011 each side ofthe center line of the chute, a rod having one end secured to a swivel connection mounted on the slide, a rocker arm having an adjustable connection for the opposite end of the rod, a rotatably mounted cam for actuating the swinging lever in one direction, an idler roller resiliently engaging the cam, connections between the idler roller engaging the cam and rocker arm, and a resilient means for the return movement of the swinging lever and starter.

30. In a thread rolling machine, the combination with a pair of stationary dies, a pair of movable dies mounted in a cross-head and coacting with the stationary dies, a chute for receiving .blanks having an arc-shaped bifurcated extension, cam actuated means for feeding blanks from the chute to the arcshaped bifurcated extension, an adjustable starter mounted on a pivoted swinging lever for engaging the headed blanks in the arcshaped bifurcated extension and adapted to deliver blanks between a pair of coacting dies on each stroke of the reciprocating crosshead, a slide mounted on the swinging lever, a rod having one end secured to a swivel connection mounted on the slide, a rocker arm having an adjustable connection for the op-l posite end of the rod, a rotatably mounted cam for actuating the swinging lever, means signature.

for reciprocating the cross-head and cams simultaneously, and friction means ada. ted to automatically stop the operation of t e machine during the working stroke of the reciprocating cross-head.

In testimony whereof I hereunto aix my JAMES A. KINNEY.

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