US1486591A

US1486591A - Stay-bolt turning and threading machine

Info

Publication number: US1486591A
Application number: US441276A
Authority: US
Inventors: Lassiter Annie Frances
Original assignee: DALE MACHINERY Co Inc
Current assignee: DALE MACHINERY Co Inc; DALE MACHINERY COMPANY Inc
Priority date: 1921-01-31
Filing date: 1921-01-31
Publication date: 1924-03-11
Anticipated expiration: 1941-03-11

Description

March 11 1924.

1,486,591 c. K. LASSITER STAY BOLT TURNING AND THREADING MACHINE Original Filed Jan. 31, 1921 8 Sheets-Sheet 1 March 11, 1924.

C. K. LASSITER STAY BOLT TURNING AND THREADING MACHINE Original Fi led Jan. 31. 1921 8 Sheets-Sheet INVENYUR was MW,

ATTORNEY.

March 11,1924. 1,486,591

C.K.LASSHER STAY BOLT TURNING AND THREADING MACHINE Original Filed Jan. 31, 1921 8 SheetsSheet 5 t m a) w '1 B: M Q

INVENTOR: All/2 77!!! a w wzeij Wi/ILI I 1 March 11, 1924.

C.K.LAS$TER STAY BOLT TURNING AND THREADING MACHINE Original Filed Jan. 31, 1921 8 Sheets-Sheet INVENTOR; a if fi wsafiwr BY a v Q M ATTORNEY March 11, 1924; v c. K. LASSHTER STAY BOLT TURNING AND THREADING MACHINE Original Filed Jan. 31. 1921 8 Sheets-Sheet 5 mwsmm:

'A TTORNEY.

March 11, 1924. 31,486,593

C. K. LASSH ER S TAY BOLT TURNING AND THREADING MACHINE Original Filed Jan. 31. 1921 8 Sheets-Sheet 6 W :i A

I NV EN TOR A TTORNE Y.

March 11, 1924. 1,4865%1 C. K. LASSITER STAY BOLT TURNING AND THREADING MACHINE Original Filed Jan. 31. 1921 8 Sheets-Sheet v aa'ch 11, 1924.

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Patents Mar. 11, 19:24.

COLUMBUS K. LASSITER, OF NEW YORK, N. Y.; ANNIE FRANCES LASSITER, MINISTER- TRIX OF SAID COLUMBUS K. LASSITER, DECEASED, ASSIGNOR TO DALE MACHIN- ERY COMPANY, INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Application filed January 31, 1921, Serial No. 441,276.

I '0 all whom it may concern:

Be it known that I, CoLUnnUs K. LAS- si'ricn, a citizen of the United States, residin at New York, in the county of New Yor 5 and State of New York, have invented new and useful li'i'iprovements in Stay-Bolt Turning and Threading Machines, of which the following is a specification.

This invention relates to a machine for in turning and threading bolt blanks, and particularly to a machine for use in turning and threading bolt blanks for the production of boiler stay-bolts of that type having a centrally reduced or relieved portion, designed to allow the bolt to have requisite resiliency, and threaded end portions designed to be screwed into threaded openings in opposed boiler sheets.

Heretofore, so far as I am aware, staybolts of this type, in which the turning and threading operations have been performed on a single machine, and in which the threading operation has been carried out by threading means movable lengthwise of the bolt blank, have only been practically made by turning and threading individual bolt blanks of the exact length and diameter required on a vertical machine, i. e., a machine in which the working tools are mounted 30 upon a head or carriage movable downwardly by gravity on its Working motion, theforce of gravity being relied upon as the source of power for the feed motion. Such machines. while sufficiently efficient for for forming threads of a certain degree of accuracy, are comparatively slow in operation on account of the time and labor required in applying and removing the blanks and finished bolts, and are not, because of objections due to the use of a gravity feed, efficient for o 'ierating upon the larger sizes of bolts or for forming threads with the high degree of accuracy required under some conditions. I am also aware that a machine of the horizontal type has been suggested, but, within my knowledge, has never been put into practical use, such machine being of complicated and cumbersome construction and requiring back and forth movements of both the stock and working tools and conthreading bolt blanks up to certain sizes and.

Renewed January 11, 1924.

sequently a great number of working movements on each operation, making it too slow and costly in construction and opera tion for practical purposes.

One object of the present invention is to provide a machine which, in general, is more rapid in operation than prior machines, and whereby bolts with threads cut with a high degree of accuracy may be readily produced.

Another object of the invention is to provide a machine which will handle and operate upon continuous bar stock, namely, a continuous rod which may be intermittently fed up to resent portions which are turned and threa ed andcut off to form the finished bolts, thus reducing time and labor in the production of the finishedarticles.

: A further object of the invention is to provide a machine of the character and for the purpose described in which a positive, accurate, and regular feed action of the threading tool is ensured, to effect the production of bolts with threads out to a very high degree of accuracy.

A further object of the invention is to provide a machine of the character and for the purpose described whereby the turning and threading tools may be controlled with facility and the threading action governed so that the bolt may first be turned and its end portions then threaded. and the lead of the threads of such end portions accuratelypreserved.

A still further object of the invention is to provide a novel construction and organization of parts whereby a machine of the horizontal type, such as of the turret-lathe type, may be advantageously used. and positive power mechanism employed for actuating the threading and turning devices.

\Vith these and other objects in view, which will appear in the course of the sub joined description, the invention consists of the novel construction, combination and arrangement of parts hereinafter fully described and claimed. reference being had to the accompanying drawings, in which Figure l is a view in side elevation of a bolt turning and thrcadingmaehine embodymg my invention.

Figure 2 is an enlarged sectional plan view of the feeding and controllin mechanism mounted upon the tail-stock of the machine. V

Figure 3 is a vertical longitudinal section on the line 33 of Figure 2.

Figure 4: is a vertical transverse section on the line 1 -4 of Figure 3.

Figure 5 is a vertical transverse section on the line 5--5 of Figure 2.

Figure 6 is a vertical transverse section on the line 6-=-6 of Figure 2.

Figure 7 is a detail section through the handle of the speed controlling lever of the tool driving and controlling mechanism the tail-stock.

Figure 7 is a detail view of a trip device.

Figure 8 is a vertical longitudinal section through the tail-stock, showing the means for locking, releasing and turning the turret.

Figure 9 is a longitudinal section throu h the chuck end of the work holding spindle.

Figure 10 is a section on the line 10-10 of Figure 2. i

Figure 11 is a front elevation of the turnin tool.

*igure 12 is a side elevation thereof.

Fi re 13 is a detail section taken substantially on the line 13-43 of Figure 11.

Fi re 14 is a detail view of parts shown in Figures 11 and 12.

Fi re 15 is a longitudinal section showing t e stock feeding and chuck opening and ing tie steps of manufacture of the stay may be employed. The gearing 5, exposed parts only of which are shown, transmits motion to a. longitudinally extending main drive shaft 6 through the medium of a train of transmission gears 7 arranged in a gear casing 8. The gearing 7 maybe of a type which admits of the interchangeable use of intermediate change-speed gears in the train whereby the shaft 6 may be driven at any proper speed for operating the threading tool, hereinafter described, at any proper speed suitable for cutting a thread of any desired pitch. The drive gearing includes as part thereof a controlling lever 9 adjustable to the three positions a, b and c, the po sition a being a neutral position in which the shaft 6 is thrown out of action and the positions I) and 0 high and low speed 3081- t-ions, respectively. The stock 10, from which the bolts are to be formed, consists of a copper or other metal rod which is fed up through a sliding chuck controlling tube 11 contained in the spindle. At the forward end of the spindle is a chuck head 12 receiving a stock clamping collet 13 of that type slotted to provide spring jaws carrying renewable bushing sections 13 secured thereto by screws 13, said bushing sections being adapted to close aboutand grip the rod when the tube 11 is moved forwardly and to release the rod when the tube 11 is moved rearwardly. Extending from the headstock is a support 14 on which is slidably mounted a sleeve connected to an actuating rack bar 1.6 and adjustable forwardly and rearwardly by means of a pinion 16 meshing with the teeth of said rack bar, said pinion being carried by a shaft 17 operable by a hand wheel 17'. The sleeve 15 is provided with a forked portion 18 engaging the grooved portion of a sliding conical or wedge collar 19 arranged to operate upon elbow levers l9 engaging the rear end of the tube 11. Connected with the sleeve 15 is a ratchet feed bar 2O slidable in a groove in the support 14-, the teeth of which bar are adapted to be engaged by a pawl or dog 21 on the stock feeding sleeve 22. This sleeve 22 engages a collar 22 fixed to the stock 10 by a set-screw 22". When the hand wheel 17 is'operated to slide the actuating rack bar 16 and feed ratchet bar forwardly, the wedge collar 19 releases the tube 11, allowing the collet 13 to open and release the stock. and the bar 20, by engagement of one of its teeth with the dog 21, transmits movement through the sleeve 22 and collar 22* to feed the stock forward the required distance.

On a reverse movement of the hand wheel 17 to slide the

bars

16 and 20 and wedge collar 19 rearwardly, the bar 20 slides through the sleeve 22 without affecting the same. as the dog 21. rides over the ratchet teeth. said parts thus moving backwardly for the subsequent feed-up action, while the wedge collar 19 actuates the levers 19 to slide the tube 11 forward to cause the collet 13 to close and grip the stock. The stock is then held for rotation with the spindle 4.

The support 14 may have one or more standrests 23, either one or both of which may carry a roller-rest to support the rear or floating end of the stock. In the present instance one such stand-rest 23 is shown suporting a roller-rest comprising a bearing racket 24 provided with a hinged arm or cap 25 forming therewith a guideway for the stock. This bracket carries a pair of rollers 26 on and between which the stock rests and the arm 25 carries a roller 27 arranged to bear upon the upper surface of the stock on a vertical line between the vertical planes of the rollers 26, such rollers bearing lightly on the stock to stably support the same while allowing it to revolve freely with the spindle when clutched there to. At its hinged end 28 the arm 25 is provided witha stop 29 to limit its opening movement and the opposite end of the arm is slotted or bifurcated to receive a swingbolt 30 having a clamping nut 31, whereby the arm may be easily and quickly secured in closed position or released for opening movement. An adjustable stop screw 32 is provided on the bracket to limit the closing movement of the arm and regulate the frictional bearing contact of the rollers on the stock. This roller-rest effectually sustains the weight of the floating end of the stock to prevent it from bending or binding, while allowing it to freely rotate with the spindle and properly centering it for the turning and threading actions.

From the foregoing description of the parts upon the headstock of the machine, it will be understood that the stock rod 10 may be properly advanced beyond the chuck to form a bolt blank portion of proper length to be operated upon to form the bolt, as shown in Figure 1, the stock gripped for vrotation with the spindle for cooperation with suitable turning and threading tools movable endwise along said blank, and the speed of rotation of the stock and rate of endwise feed of said tools governed and regulated according to the pitch of the thread which is to be formed. A suitable cut-oil is provided whereby the completed bolt ma be severed from the body of the stock. This may be of a type commonly employed in screw machines, the same including a cutting tool 33 coacting with a suitable backing cutter (not shown) and mounted upon a holder 34 carried by a slide 35, said slide being adjustable longitudinally of the frame by adjusting means operated by a hand wheel 36, and said holder being adjustable transversely ofthe. machine for. cutting and receding actions by adjusting means operated by a hand wheel 37. I have not deemed it necessary to illustrate the cut-ofi in detail, as any suit-able or known type of cut-off adapted for the purpose may be employed.

Mounted upon the tail-stock is a turret 38 revolubly supported upon a slide or car riage 39, said turret rotating upon an axis 40. The turret is provided with at least three work faces for the reception of a corresponding number of work devices, to wit, a stock stop 41, a turning cutter 42, and a threading die 43, but, as shown in the present instance, a turret of hexagon type is preferably employed having the work faces (l, e, f, g, h, 2', on which may be mounted two sets of work devices of the character described, which are arranged in proper order for successive use in the rotation of the turrot. This permits of a more rapid indexing action when the machine is used for staybolt production only and for the omission of one set of the work devices if it should be desired to employ the machine for special work on the stock or for other kinds of Work for which the machine may be adapted. Sockets 44 are provided in the turret to receive tools having shanks to be fitted therein, and adjustable stops at, e, f, g, h, 71', arranged for use in connection with the respective turret faces, are mounted upon a rotary head 39 carried by the slide 39, said head being coupled to an indexing shaft 45 for rotation therewith, which shaft carries a bevel gear 46 meshing with a similar gear 47 on the turret whereby when the turret is turned for an indexing action, i. e., to bring a certain working face into working position, the series of stops will at the same time be turned to bring the proper stop into po sition for use. Each active stop is adapted, at the limit of the working movement of the slide when such stop which coacts with said certain working face is in position, to engage a trip arm 48 upon a transverse rock shaft 49, whereby the turret feed mechanism is thrown out of action, as hereinafter described. The turret is provided with a series of keeper sockets 50, one for each of its work faces, adapted to receive a vertically movable plunger pin or looking bolt 5], whereby the turret is locked against rotation in its working positions. The bolt 51 is carried by the slide 39 and is pivotally connected y with one end of a centrally pivoted lever 52, a spring 53 being provided to normally hold the lever in bolt-projecting (locking) position. The other end of the lever has a contact portion 54 arranged for cooperation with a trip member 55 mounted on the tail stock frame, said trip member having an inclined or cam surface 56 and a horizontal supporting surface 57. \Vhen the slide 39, after making a working movement forward, is reversed and nears the limit of its return movement, the contact member 54 engages and rides upward on the surface 56, thus retracting the bolt 51 and freeing the turret, and then stops and rests upon the surface 57 so as to hold the bolt retracted while the turret is being indexed or turned to the next working position. On the succeeding forward movement of the slide the bolt is released in an obvious manner and locks the turret in such position. The turret carries the indexing pins 58-, corresponding in num her and working relation to its work faces, which pins are adapted to be successively engaged and actuated to turn the turret by means of an index lever arm or dog 59. This arm or dog is pivoted at its rear end, as indicated at 60, so as to have a limited degree of lateral swinging movement to the extent allowed by a stop pin 61 and recess 62, a spring 62 serving to hold said arm in normal position. The forward or free end 63 of the arm is suitably curved or notched for engagement with the pins 58. Upon the retraction of the bolt 51 and release of the turret as the slide 39 nears the limit of its return movement, the pin 58 then in position engages the end 63 of arm 59 whereby, in the final portion of such movement of the slide, the turret is turned to its next working position. In this operation the arm yieldingly swings against the resistance of its spring 62 to a sufiicient degree to conform to the arc of movement of the engaged pin. On the next forward movement of the slide the arm 59 is reset by spring 62' to engage the next succeeding pin 58 of the series, as will be readily understood.

When the turret is in its first position,

the stock stop or gauge 41 is presented for use as a preliminary to the feeding up of the stock 10 by the stock feeding and grip-" ping mechanism, said stop gauging the extent of projection of the end of the rod 10 to form a bolt--blank of proper length for use. The turret is then turned to the second position to bring the turning or relieving tool 42 in position for use to first form the concaved, relieved or turned portion 10 upon the center of the bolt-blank, after which the tool 42 is retracted and the turret turned to the third position to present the threading tool for use in forming the threads 1O upon the ends of the blank, the bolt then being cut off from the body of the stock by operating the cut off device 38. During these operations the stock is revolved through the action of the spindle drive gearing, as previously explained, and the turret slide is operated and controlled to suecessively cause the turning and threading tools to move lengthwise of the blank for the turning and threading operations through the medium of feeding and controlling mechanism on the tailstock. the construction and operation of which I will now proceed to describe.

Journaled upon the carriage or slide 37 is a lead screw 64 which is engaged by a worm-toothed gear feed nut 65 journaled in fixed bearings upon the tail-stock and meshing with a worm 65 (see Figure i) on :1

casing 67 receiving one end of the shaft 66 and in which the adjacent end of themain drive shaft 6 is received and journaled. On said end of said shaft 66 is fixed a double gear having beveled gear teeth 68 and spur gear teeth 69. Extending longitudinally within the casing 67 are two other shafts, a primary transmission shaft 70 and a secondary transmission shaft 71. Fixed on the shaft 6 are high and low speed gears 72 and 73, and feathered to slide upon and rotate with the shaft 7 0 is a grooved sleeve 74 carrying high and low speed gears 75 and 76. The sleeve 7-1 is shiftable, by means of a forked crank arm 77 operable by a speed controlling lever 78, to throw the gears 7572 into mesh for a high speed action, or the gears 7 67 3 into mesh for a slow speed action, or to dispose said

gears

75 and 76 in a neutral position. Lever 78 has a hollow handle shank 79 enclosed by a sliding handle sleeve 80 and enclosing a locking bolt 81 and its projecting spring 82, which bolt is adapted to be retracted by an outward sliding movement of said sleeve. The bolt when projected is adapted for engagement with any one of three keeper recesses 83, 84 and 85 in a lock plate on the casing 67 to lock the lever, and consequently the gears 75 and 7 6, respectively, in neutral, low and high speed positions. This lock plate also serves as an indicator for determining the position of lever 78, and it may be stated that when lever 78 is in position 84 the gearing is set for driving the mechanism at boltturning speed and when said lever 78 is in position 85 the gearing is set for driving the mechanism at threading speed. F ixed directly to shaft 70 is a third gear-'86 which is in constant mesh with a gear 87 carried by a sleeve 88 loosely mounted on shaft 71, which sleeve also carries a clutch pin 89 forming one part of a one-revolution clutch.

When either one of the speed gears on the shaft 70 is in mesh with its companion gear on shaft 6 it will be evident that, assuming that shaft 6 is in motion. shaft 70 and sleeve 88 will be constantly driven at high (turning) or low (threading) speed, but that shaft 71 until clutched to sleeve 88, will stand idle. O-n shaft 71 is fixed a beveled gear 89 which meshes with the beveled gear member 68 of the double gear on shaft 66, and feathered to slide upon and rotate with said shaft 71 is a grooved clutch sleeve 90 carrying a clutch pin 91' for cooperation with the pin 89 and forming the other working part of the one-revolution clutch. When said

clutch pins

89 and 91 are engaged, low

or high speed motion will be transmitted through shaft 71, shaft 66 and nut 65 to the lead screw 64 for driving the slide or carriage 37 in a forward direction. Sleeve 90 is engaged by the forked crank arm of a rocking clutch lever 92 having an operating handle 93, carrying a latch pin or stud 94 to engage a cooperating latch member 95 on one (the outer) end of a nonrotary slidable throw-off or releasing shaft 96. Shaft 96 has its inner end (see Figure 6) in sliding engagement with the adjacent end of shaft 49, with which it isin lon itudinal alinement, and on said shaft en ds are collars or heads 97 and 98 having spirally disposed cam surfaces. A coiled spring 99 surrounds the outer end of the shaft 49, between the head 98 on the shaft 96 and the inner wall of casing 67, and nor mally forces (slides) the shaft 96 outward to hold the latch member 95 projected and to also maintain the head 98 in frictional contact with the head 97 so that trip 48 is normally maintained in its upright working position. When any of the stops d, e, etc., comes in contact with the trip 48, at the limit of a forward working movement of the turret slide or carriage, the shaft 49 is rocked in a forward direction, causing the cam head 97 to force the cam head 98 rearwardly against the resistance of spring 99. Such action will causean inward sliding movement of shaft 96, withdrawing latch member 95 from under latch member 94 and releasing the clutch lever 92, which will drop by gravity to a lowered position. By this operation of lever 92 clutch sleeve 90 will be retracted, withdrawing clutch member 91 from engagement with clutch member 89 and throwing shaft 71 out of action. will be arrested and the slide or carriage 37 will come to a stop. When the carriage is reversed and the pressure on the trip 48 of the carriage stop is relieved, the spring 99 resets the trip device and throw-off. The

latch members

94 and 95 are provided with beveled faces to allow the latch member 95 to be forced inward by the latch member 94 when lever 92 is swung up to clutching position, spring 99 yielding and then forcing the latch member 95 out for the lever locking action. It will be observed that this clutch throw-off action is performed without affecting the action of the drive gearing, which is controlled by the operation of the lever 78. Journaled upon casing 67 is a shaft 100 carrying a hand wheel 101 by means of which it may be operated. Fixed to this shaft is a spur gear 102 which meshes with the spur gear pinion member 69 of the double gear on shaft 66. The

gears

69 and 102 provide a gear connection between

shafts

66 and 100 which is of higher speed ratio Hence the operation of shaft 66 rection at accelerated speed by operation of The operator may,

the hand wheel 101. therefore, quickly reverse the carriage at the end of a working operation or move the carriage back and forth for a rapid turning of the turret for indexing actions as occasion may require.

The stock gauge stop or stops 41 may be of any preferred type and mounted in any preferred way upon the proper face or faces of the turret 38. The turning tool or tools 42 employed may also'be of suitable construction, a preferred form of box mill type being illustrated generally in Figures 11 to 14, inclusive. As shown said tool comprises a suitable body 103 having an opening 104 to-receive the end of the stock, a cutting tool 105 to act upon the stock and rollers 106 to. bear upon the stock opposite said tool and properly back and center the stock with relation thereto. The tool 105 is mounted in a support 107 pivoted at 108 to the body 103, said support being connected with a binder member 109 movable'in an'arcuate slot 110 in the body so that the cutter may be adjusted to cut to a suitable depth, and a handle 111 being provided for adjusting said support and actuating the binder member to secure the support in adjusted position. The binder member 109 shown in the present instance comprises a stem extending loosely through the slot 110 and having the actuating handle 11.1 at one end, its opposite end being threaded to engage a threaded opening in the support 107, whereby said support may be released for adjusting movements and then clamped. A stop screw 112 may be provided for limiting the outward swing of the support and setting it for working adjustment. The rollers 106 are carried by slides 113 radially adjustable toproperly position the rollers according to the size of the stock and to regulate their pressure thereon. In the turning action the carriage 39 feeds forward until the end of the stock enters the opening 104 and the tool 105 reaches the proper point in the length of the presented blank to begin the cut, at which time the tool is set to cut into the stock and form the relieved portion 10 as the tool travels along the stock. When the proper point to terminate the cut is reached the proper stop 0 engages the trip 48 and releases the clutch lever 92 to stop the feed motion of the carriage 39. The tool 105 is then retracted, the carriage 39 reversed to starting position, and the turret 38 turned to bring the threading tool 43 into position for use, the construction and operation of which I will now proceed to describe.

As shown particularly in Figures 19 to 22,

inclusive, the threading tool 43 comprises a die body 114 having an axial opening 115 in alinement with the bore of a hollow shank 116, which shank is suitably fixed to said body and is adapted to be fitted and secured in the proper turret socket 44. The axial opening 115 and hollow shank form a passage to receive a-bolt blank of any required length to be threaded and which allows the tool to enclose and travel along (lengthwise of) the bolt-blank. Fixed to the shank 116 is a head 117, against which the rear surface of the body 114 normally bears. The body 114 is slidably mounted for back-and-forth movement on the shank 116 but is connected with the head 117 by the driving pins 118 and the guide bolts 119 which allow the body to have the sliding motion described while holding said body against rotation relative to the shank and head. Springs 120 are provided for cooperation with bolts 119 to return the body, after forward sliding movement, to normal position; The body is provided with suitable guideways for radially movable and adjustable chaser dies 121, said dies being carried by the sliding die-carrierblocks 122 adapted to be moved outward or retracted by springs 123. Rotatably mounted on the body is a cam die closing ring 124,

provided with the closing handles or pins 125. This cam rin is provided with recesses 126 into whic the outer ends of the blocks 127 may recede in the opening movement of the dies, and the walls of said recesses 126 and the outer ends of the blocks are respectively provided with inclined or cam surfaces 128 and 129 whereby, through a prescribed rotary movement of the ring 124 the dies may be moved inward to threading position. Springs 130 are employed to move the ring 124 to die opening position, which springs are tensioned when the ring is moved to die closing position for subsequent reaction to move the ring to die opening position. Coupled to the head 117 for a limited rotary movement, and against longitudinal sliding movement, is an adjusting and locking ring 131, adjustable by means of the micrometer screws 132. This ring 131 is provided with a spring-actuated locking belt 133 to engage a locking shoulder 134 on the cam ring 124, whereby said cam ring is locked in die closing position. The position of this bolt may be varied by adjustment of the ring 131, so that the extent of die-closing and locking movement of the ring 124 may be varied to compensate for wear of the'dies whenever this becomes necessary, as well as m vary the depth of the formed threads it so desired. Secured to the body is the usual dust-cover 135. The bolt 133 has an outwardly projecting threaded stem 136 engaged by a setnut 137 having an adjusting handle 138, by means of which the forward extent of rejection of the bolt under the action or its spring may be regulated. When the threading tool is in action and nears the limit of its working movement, at which time the motion of the carriage is arrested by its proper work-stop, the continued rotation of the stock 10 will cause the chasers to continue to cut and travel along the stock, carrying with them the die body 114, said die body and the cam ring joint-l sliding forward on the shank, until the ocking shoulder of the camv ring passes out of engagement with the looking bolt 133. The cam ring is then freed for reverse rotary movement under the action of its springs 130, whereby the dies are released for openin movement. Springs 120 then return the die body and cam ring to normal position,- in readiness for the subsequent die closing-and threadin operations.

In the operation or the organized machine assuming that a bar or rod 10 of stock is in position to be fed up, and the drive gearing upon the headstock is set into action, the operator actuates the stock feed and chuck mechanism to advance the forward end of the stock to a sufiicient degree to form a bolt blank and to grip the stock for rotation by and with the spindle. In this operation it is to be assumed also that the turret 38 is arranged to dispose the stock stop 41 in position to a the bolt blank. The stoc: being fed up, the

turret 38 is then turned to bring the turning tool 42 into operative position and lever 78 adjusted to osition 84 to set the high speed gearing o the turret slide feed mech--- anism into action and the lever 92 set to throw the one-revolution clutch into operation to communicate motion to the turret slide or carriage. When the tool 42 reaches the proper position on the bolt blank, the cutting tool thereof is projected for operation to form the turned or concaved portion 10, the motion of the carriage being arrested by the proper slide stop when the end of the turning out is reached, whereupon the turning cutter is retracted, the carriage reversed by means of the carriage reverse mechanism, and the turret 34 turned to bring the threading tool 43 into working position. It will of course be understood that at the end of the turning operation the carriage stop effects a cessation of e the length of IOU the movement of the carriage by the autoria e and the movement of the threading tool 43 longitudinally of and along the bolt blank the terminal portions of the blank will be formed with the threads 10", as shown in the completed bolt disclosed in Figure 25. During the threading operation the lever 78 is adjusted to the position 85 to throw the low speed drive gearing of the carriage into action, and lever 92 adjusted to set the clutch, and this rate of peed may be preserved throughout the entire operation of threading the bolt blank. In order to secure in creased speed, however, it will be understood that during the travel of the threading dies along the turned portion 10 lever 78 may be adjusted to the high speed position 84, so that between the first and final threading actions on the respective bolt ends the threader may travel with increased speed during the intermediate idle portion in its range of threading movement. At the cessation of the threading operation the proper carriage stop comes into position to effect the release of the lever 92, whereby the onerevolution clutch is thrown out of action, whereupon the lever 7 8 may be moved back to neutral position 83, or to speed position 84, as desired. The bolt blank having been threaded and turned, as above described, the cutting tool 33 is now brought into action to sever the completed bolt from the body of the stock 10, after which the stock is fed up and the parts of the mechanism properly disposed for a repetition of the above described operations in turning and threading the succeeding bolt blank. It will be evident from the foregoing description that as the carriage i operated on its working motion by positive drive mechanism through a gear nut and lead screw, while the stock is revolved at a prescribed coordinated rate of speed, positive and etlicientturning and threading actions of the turning and threading tools upon the bolt blank will be obtained. Also it will be readily understood that in threading thebolt blank the lead of the thread between the separate thread portions thereof will be preserved, a feature of primary importance in the manufacture oi bolts of this character, while at the same time a high degree of accuracy in the cut-- ting of the threads is secured. By the provision of a machine of the character disclosed the objections to prior machines of the vertical type, and in which the working tools have a gravity feed, are effectually over-- come, the output of the machine increased, and a better and more perfect product obtained. Also, as there are no back and forth movements of the stock to prescribed working positions, or complex means for adjusting the sameor the working tools into and out of working positions, simplicity of construction and working action is secured,

- and at the same time the high speed mechanism allows rapid return of parts to starting position after each working step, making the machine simpler, and less costly in construction as well as more re id and less costly in operation, than prior machines of horizontal type heretofore suggested.

It will, of course, be understood that while the construction and arrangement of parts disclosed is preferred, suitable changes and modifications may be made such as clearly fall within the spirit and scope of the invention as defined in the appended claims. Also that, while the machine is primarily designed for the purpose described, it may also be employed for any other purpose or use for which it may be found to be adapted.

' laving thus fully described the invention, I claim:

1. In a machine for turning and thread ing stay bolts, the combination of means for intermittently feeding up a continuous stock rod, successive portions of which are to be turned, threaded and severed from the remainder of the stock to form the bolts,

ately turning and terminally threading a portion of the stock rod presented for treatment by a working movement of said devices lengthwise of said stock,'power means for applying a positive'working travel to said carriage, and means for-cutting 013' the formed bolt from the body of the stock.

2. In a machine for turnin and threading bolt blanks, the combination of means for holding and rotating a bolt blank, a cutter for endwise movement in one direction along the bolt blank for concaving said blank, a threader for endwise movement along the bolt blank in the same direction as the cutter for successively threading the blank at opposite sides of the concaved portion formed by the cutter, both the cutter and the threader being operative upon the blank while .the blank is rotating but held from endwise movement, a carriage for supporting the cutter and the threader on which said tools are mounted so as to be adjusted into and out of working position,

and aring for driving said carriage on a working travel to move the tools along the endwise stationary but rota-ting bolt blank.

3. In a machine for turning and threading bolt blanks, the combination of means for holding and rotating a bolt blank, a

cutter for endwise movement in one direction along the bolt blank for concaving said blank, a threader for endwise movement along the bolt blank in the same direction as the cutter for successively threading the blank at opppsite sides of the concaved poring including a lead screw coupled to the carriage and a nut in gear with said lead screw.

4. In a machine for turning and threading bolt blanks, the combination of means for holding and rotating a bolt blank, a cutter for endwise movement in one direction along the bolt blank for concaving said blank, a threader for endwise movement along the bolt blank in the same direction as the cutter for successively threading the blank at opposite sides of the concaved portion formedby the cutter, both the cutter and the threader being operative upon the blank while the blank is rotating but held from endwise movement, a carriage for supporting the cutter and the threader on which said tools are mounted so as to be adjusted into and out of working position, a load screw coupled to the carriage, a nut for driving said lead screw, high and low speed gearings for driving the nut, manually operable means for setting either the high or the low speed gearing into action, and means for automatically throwing said setting means out of action at the limit of a working travel of the carriage.

5. In a machine for turning and thread ing bolt blanks, and in combination with a suitable frame, and means for supporting and rotating a bolt blank while holding said bolt blank from longitudinal movement during turning and threading actions, turning and threading tools arranged to be presented for successive turning and threading actions on the bolt blank in which said tools travel in one direction along the rotating but longitudinally stationary bolt blank, a carriage supporting said tools, a lead screw on said carriage, a gear nut on the frame and engaging the lead screw, drive mechanism for actuating the gear nut, and means for driving the gear nut from the drive inechanism at variable speeds.

6. In a machine for turning and threading bolt blanks, the combination of means for holding a bolt blank, means for feeding up said bolt blank to successively expose portions thereof for turning, threading and severing actions, means for rotating the bolt blank for working actions thereon while holding said bolt blank against longitudinal movement, a carriage having a working travel along the rotating bolt blank, a concaving tool on said carriage, a threading tool It ,itaesei on said carriage, said concaving and threading tools being arranged so as to be presented for successive actions to concave a portion of the blank and successively thread portions of the blank on opposite sides of said concaved portion thereof in the travel of the carriage in one direction along the rotating blank, a lead screw mounted upon and movable with the carriage, a gear nut engaging said lead screw, a continuously rotatingdrive shaft, a primary transmission shaft, manually adjustable high and low speed gearing for coupling the drive shaft to the primary transmission shaft, a secondary transmission shaft for driving the gear nut, a clutch device for connecting said secondary transmission shaft with the primary transn'iission shaft, an operating element for setting said clutch device for action, and automatic means actuable at the end of a turning or threading cut for shifting said operating element for throwing said clutch device out of action.

7. In a machine for turning and threading stay bolts, the combination with a suitable supporting frame, and means for rotating a bolt blank while holding it from longitudinal movement, of a carriage having a Working travel in one direction longitudinally of the blank, threading and turning devices mounted on the carriage for successive adjustments to working positions in successive working travels of said carriage, and a power mechanism for driving said carriage, said power mechanism including a lead screw on the carriage and a nut on the frame in engagement with said lead 8. In a bolt turning and threading machine, the combination of means for supporting and rotating a bolt blank while holding it from longitudinal movement, a carriage having a working travel in one direction along the rotatable but endWise erable mechanism for actuating said shaft independently of said drive mechanism for a reversing the carriage.

9. In a bolt turning and threading machine, the combination of means for supporting and rotating a bolt blank while holding it from longitudinal movement, a

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reactor carriage having a working travel in one di: rection along the rotating but otherwise sta tionary bolt blank, turning and threading tools upon the carriage adjustable so as to be successively presented for use for successively turning a portion of the bolt blank and threading said blank at opposite ends of the turned portion on successive working travels of the carriage, a lead screw mounted on and movable with the carriage, a gear nut engaging said screw, a carriage drive shaft for transmitting motion to the gear nut, a primary drive shaft, manually controlled sets of gearing operative for driving the carriage drive shaft at different speeds from the primary drive shaft, and manually operable gearing for transmitting motion to the carriage drive shaft independently of said sets of speed gearing for reversing the direction of travel of said carriage drive shaft and the carriage.

10. In a machine for turning and threading stay bolts, the combination of means for supporting and rotating a bolt blank while holding it from longitudinal movement, a carriage having a working travel in one direction along the bolt blank, turning and threading tools mounted on said carriage and arranged to be successively presented for concaving a portion of the blank and threading the blank at opposite ends of the concaved portion on successive working travels of the carriage along the bolt blank, drive gearing for imparting working motion to the carriage, a clutch device for throwing said drive gearing into and out of action, a handle for actuating said clutch device, a latch for holding the handle to maintain the clutch in working position, and means operative on a prescribed working motion of the carriage for tripping and releasing said latch.

11. In a machine for turning and thread ing stay bolts, the combination of means for supporting and rotating a bolt blank while holding it from endwise movement, a carriage having a working travel in one direction along the bolt blank, turning and threading tools supported by the carriage, a lead screw on the carriage, a gear nut engaging with said lead screw, a shaft for driving the gear nut, a primary drive shaft, primary and secondary transmission shafts, gearing for driving the primary transmission shaft at high or low speed from the primary drive shaft, a gear element on the secondary transmission {shaft constantly driven from the primary transmission shaft when said primary transmission shaft is in action, gearing between the secondary transmission shaft and the nut actuating shaft, a manually operable clutch device for fixing said gear element to said secondary transmission shaft, a latch device for holding said clutch device in engaging position, and

means operative on a prescribed travel of the carriage for tripping and releasing said latch device.

12. In a machine for turning and thread ing stay bolts, the combination, with means for holding and rotating a bolt blank, of means for turning the central portion of the bolt blank, means for threading the terminal portions thereof, a carriage having a working travel in one direction alon the bolt blank, turning and threading too on said carriage, a lead screw upon the carriage, a gear nut engaging said screw, and means for driving said gear nut.

13. In a machine for turning and threading stay bolts, the combination, with 'means for holding and rotatin a bolt blank, of a carriage having a wor ing travel in one direction along the bolt blank, a turning tool upon the carriage for turning the intermediate portion of the bolt blank, a thread ing tool upon the carriage for threading the terminal portions of the bolt blank, gearing for driving said carriage, power mechanism for driving said gearing, and means for varying the speed of said gearing for the turning and threading cuts.

14. In a machine for turning and threading stay bolts, the combination, with means for holding and rotating a bolt blank, of a carnage having a working travel in one direction along the bolt blank, a turning tool mounted on therearriage, a threading tool mounted on the carriage, drive gearing, transmission gearing for transmitting motion from the drive gearing at relatively different turning and threading speeds, means for transmitting motion from said transmission gearing to the carriage, and meansfor throwing said means out of action without affecting said drive gearing and transmission gearing.

15. In a machine for turning and threading stay bolts, the combination, with means for supporting and rotating a bolt blank while holding it from longitudinal movement, of a carriage having a working travel in one direction along the bolt blank, a turning device upon the carriage for centrally reducing the bolt blank, a threading device upon the carriage for threading the terminal portions of the bolt blank, and gearing for driving the carriage at different turning and threading speeds, said gearing being operative for driving the carriage at the higher turning speed during the movement of the threading device over the reduced portion of the bolt blank.

16. In a machine for turning and thread ing stay bolts, the combination, with suit able supporting frame, and means for holding and rotating a bolt blank, of a carriage having a working travel in one direction along the bolt blank, turning and threading devices mounted upon the carriage, gearing embodying a lead Screw and nut for driving the carriage uniformly at any predeter-- inined speed, and means for varying the speed of said gearing.

i 17. In a machine for threading and turning stay bolts, the combination, with asuitable supporting frame, and means for holding and rotating a bolt blank, of a carriage having a-worklng travel in one direction longitudinally of the bolt blank, turning --and threading devices mounted on the car- 'riage, gearing for driving the carriage embodying a lead screw on the carriage and anut on the frame engaging therewith, a

15.-variable speed power mechanism for driv- '-'-in said gearing, and aclutch for throwing said' gearing into and out of connection with said power-mechanism. 18. In a i'nachinefer turning and threading stay bolts, the combination, with a suitable supporting f'lfiame, and means for holding and rotating a bolt blank, of-a carriage having aworking travel in one direction longitudinally of said bolt blank while said blank is being rotated-but held from longitudinal movement, turning and threading devices, on the carriage, gearing for driving the-carriage embodying a-lead screw on the carriage and a nut on the frame engaging therewith, a variable speed power mecha- 'nism for driving said gearing, a clutch for connecting said' gearing with and disconne cting it' from the power mechanism, and 'RTIQBJIST automatically operativeon a predetermined movement of the carriage for throwing the clutch out of action. 19. In a bolt-turning. and threading machine, the combination of a boltblank support, a tool support, turning and threading 40 tools mounted thereon, means for producing relative rotation between the bolt blank and the tool acting thereon, and means for producing relative movement between the bolt blank and the tool acting thereon by travel of said tool along and in one direction of length of 'saidblank while relative rotation -is occurring and theblank isfixed against longitudinal movement, said means embody-' ing a lead screw coupled to and movable with the tool, a nut acting thereon, and

drive gearing for actuating said nut.

20. In abolt turning and'threading machine-the combination of a bolt'blank support, a tool support having a working travel in ,one'direction "longitudinally of the bolt blank, turning and threading tools mounted on said support, means for producing relative rotation-betweenthe bolt blank and the tool acting thereon,-'and means for producing relative movement between the bolt blank and the 'tool'ac'ting-thereon through the travel of the support in .the direction-of length of said blank while the-latter is fixed against longitudinalmovement, said means at embodying a lead screw coupled to the tool support, a nut acting thereon, a drive shaft, a driven shaft for actuating the nut, and means for operating the driven shaft from the drive shaft at varying speeds.

21. In a machine for turning and threading bolt blanks, the combination of means for supporting and rotating a bolt blank while holding it, during rotation, from endwise movement, a carriage having a working travel in one direction longitudinally of the bolt blank, turning and threading too'ls mounted upon the carriage and adapted to be successively presented for respectively concaving the bolt blank and threading portions of the blank on opposite sides of the concaved portion on successive working travels of the carriage, a lead screw carried by and movable with the carriage, a gear nut engaging said lead screw, a carriage drive.-

one fixed to said loose gear and the other tosaid primary transmission shaft, a lever for moving one of said clutch members into and out of working position, a latch for holding said lever in clutch engaging position, and a trip device operable at a point in the working travel of the carriage for automatically releasing said latch.

22. In a bolt turning and threading machine, the combination of a bolt blank support, a tool support, turning and threading.

tools mounted thereon, means for holding the blank against longitudinal movement while producing relative rotation between the bolt blank and the tool acting thereon, and means for producing relative movement between the bolt blank and the tool eacting'thereon by travel of the tool support in one direction of length of said blank-said means embodying a lead screw coupled to the tool support, a nut acting thereon, a drive shaft, a driven shaft for actuating the nut, gearing between said shafts, a clutch for throwing said gearing into and out of action, means for setting said clutch into action, and means for automatically throwing said clutch out of action.

23. In a bolt turning and threading machine, .the combination of a bolt blank support, a tool support, turningand threading tools "mounted thereon, means for holding the blank against longitudinal movement meaeei while producing relative rotation between the bolt blank and the tool acting thereon, and means for producing relative movement between the bolt blank and the tool acting thereon by travel of the tool support in one direction of length of said blank, said means embodying a lead screw coupled to the tool. support, a nut acting thereon, a drive shaft, a driven shaft for actuating the nut, a primary transmission shaft, means for driving said primary transmission shaft at varying speeds from the drive shaft, a clutch controlled secondary transmission mechanism for driving the driven shaft from said primary transmission shaft, means for setting.

said clutch into action, and means for throwing said clutch out of action at the cessation of a tool Working operation on the bolt blank.

24. In a bolt turning and threading machine, the combination of a bolt blank support, a tool support, turning and threadin tools mounted thereon, means for holding the bolt blank from longitudinal movement while producing relative rotation between the bolt blank and the tool acting thereon, and means for producing relative movement between the bolt blank and the tool acting thereon by travel of the tool support in one direction of length of said blank, said means embodying a lead screw coupled to the tool support, a nut acting thereon, a drive shaft, a driven shaft for actuating the nut, clutch controlled gearing for driving the driven shaft from the driving shaft, and means for reversing the action of the lead screw and nut through said driven shaft.

25. In a bolt turning and threading machine, the combination of a frame having headstock and tailstock, a non-longitudinally-movable rotary spindle on the headtion actuated bv stock portion, stock feeding and clamping mechanism associated with the spindle whereby a stockrod may be fed up through the spindle and rotated while it is held against longitudinal movement, a primary drive mechanism on said head stock portion, a carriage on the tailstock portion movable toward and from said spindle and having a working travel in one direction along the stock rod, a turret on the carriage, turning and threading tools carried by the turret and adapted to be successively moved into position for respectively concaving a por tion of the stock and threading the stock on opposite sides of the concaved portion during successive working travels of the carriage, a lead screw on the carriage, a gear nut on the frame engaging said lead screw, gearing on the tailstock porsaid primary drive gearing for actuating said gear nut, and a change g speed mechanism for controlling said gear- 26. In a machine of the character described, the combination of a frame, a hollow rotary spindle, through which a stock rod is adapted to be passed "and extended in rear of the spindle in the form of a floating end ortion, means associated with the spindle or gripping, releasing and feeding up the stock, and a support for the floating rear end of the stock comprising a fixed lower member having spaced supporting rollers, and a movable upper member having a roller on a line between said spaced rollers, and means for securing said movable upper member to cause the roller thereon to press the stock lightly against the spaced rollers.

In testimony whereof I aflix my signature.

COl'aUlVfBUS K. LASSITER.