US867380A - Pipe-curving machine. - Google Patents

Description

PATENTBD OCT. 1, 1907.

W. 0. KIRK.

PIPE GURVING MACHINE. I APPLICATION FILED JULY13, 1907.

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1%., 867,380. W. 0. KIRK.

PIPE OURVING MACHINE.

APPLICATION FILED JULY 13, 1907.

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' W. 0. KIRK.

PIPE GURVING MACHINE.

APPLICATION FILED JULY 13, 1907.

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,datorney UNITED STATES WILLIAM CLARK KIRK, OF OHATTANOOGA, TENNESSEE.

PIPE-CURVING MACHINE.

Specification of Letters Patent.

Patented. Oct. 1, 1907.

Application filed July 13, 1907. Serial No. 383,555.

To all whom it may concern:

Be it known that 1, WILLIAM CLARK KIRK, a citizen of the United States, residing at Chattanooga, Hamilton county, Tennessee, have invented certain new and useful Improvements in PipeCurving Machines, of which the following is a specification.

This invention concerns itself with an. improved machine for curving sheet metal pipes by forming a series of substantially circumferential crimps or corrugations in the pipe, the corrugations being deeper at the concave side of the curved pipe. While the principle of my machine lends itself to more extended application the exemplifying machine herewith set forth has been devised for the special purpose of producing stove pipe elbows curved by means of a single continuous helical corrugation, as illustrated in my U. S. Patent No. 850586 of April 16th, 1907. In the exemplifying machine herein set forth the unseamed straight tube of proper length is placed in the machine and the machine started, whereupon the corrugating and consequent curving is done by continuous action of the machine which automatically stops upon the completion of the work.

My invention will be readily understood from the following description taken in connection with the accompanying drawings in which 1 Figure 1 is a front elevation of a pipe curving machine embodying an exemplification of my present invention: Fig. 2 a plan of the main functional parts of the machine, part section in the plane of line a of Figs. 1, 3 and 4. Fig. 3 an elevation of the head of the machine: Fig. 4 a vertical section in the plane of line 0 of Fig. 1: Fig. 5 a plan of the swinging chuck carrier: Fig. 6 a front elevation of the feed mechanism forthe sliding chuck: Fig. 7 a plan of the trigger for automatically arresting the motion of the machine: Fig. 8 a vertical section of the stop clutch in the plane of line 6 of Figs. 3, 9 and 10: Fig. 9 an elevation of the front face of the stop-clutch, the driving shaft appearing in vertical section in the plane of line f of Figs. 1 and 8: and Fig. 10 a vertical section of the stop-clutch in the plane of line g of Fig. 8.

The machine particularly set forth herein being designed for the production of stove pipe elbows, let it be assumed that there is in hand a straight metal tube of proper diameterand length, with the joint-edges lapping but not seamed, the duty of the machine being,

beginning at a point near one end of the tube, to form In the drawings :1, indicates the bed of the machine: 2, a transverse guideway at the head end of the bed: 3, a headstock mounted in this guideway and capable of "some degree of movement therein transverse to the length of the bed: 4, a longitudinal guideway in the bed at right angles to transverse guideway 2: 5, a tailstock sliding in this longitudinal guideway to and from the headstock: 6, a fixed chuck-ring rigidly secured to the tail-stock, this chuck-ring having a cylindrical bore of a size to suit the tube to be dealt with, the axis of the bore of the ring being coincident with the axis of the headstock when the latter is in a certain position of transverse adjustment: 7, an expansible skeleton plug disposed within the chuck-ring and adapted, when expanded, to clamp the end of the given tube concentrically and firmly within the chuck-ring: 8, ,a conical spreader disposed axially within the plug and adapted, by endwise adjustment, to expand the plug: 9, a hand-Wheel threaded upon the shank of the spreader and adapted to draw it forcibly within the skeleton plug to expand the latter: 10, the main bearing formed by the headstock 3, the diameter of this bearing being very much in excess of that of the largest tube the machine is to deal with: 11, a large open driving ring journaled in this headstock bearing: 12, gear teeth formed on the periphery of the driving ring: 13, a driving shaft journaled longitudinally in the bed: 14, a pinion on the head end of the driving shaft and engaging the teeth on the driving ring: 15,-a gear loose on the tail end of the driving shaft: 16, a countershaft journaled in the bed and adapted to have rotary motion transmitted to it from any proper extraneous source of power: 17, a pinion fast on the countershaft and engaging gear 15: 18, a stop-clutch, considered as a whole, for locking gear 15 to the driving shaft when the machine is to operate and for unlocking it when the machine is to come to rest: 19, a stop screw carried by the bed for limiting the transverse adjustment of the headstock in its guideway in one direction: 20, a similar stop-screw for limiting the adjustment of the headstock in the opposite direction: 21, a lever cooperating with the bed and headstock and serving, when placed in the vertical position indicated in Fig. 3 to throw the headstock against stop screw 19 and serving when turned down horizontally to draw the headstock against stop-screwZO and lock it in that position, in which position the axis of drivingring 11 is eccentric with the axis of chuck 6: 22, a carriage sliding in a guideway at the head end of the bed in a direction at right angles to the axis of chuck 6: 23, a swinging chuck-carrying arm mounted on this carriage and presenting itself in front of the headstock: 24, a vertical pivot coupling the swinging arm to its carriage, the axis of this pivot coinciding with the center of curvature to be produced in the tube: 25, a second chuck, herein termed the swinging chuck, similar in construction to the chuck heretofore described, this swinging chuck being secured to the rear face of the swinging arm with its axis coinciding with that of the other chuck: 26, the hand-wheel for adjusting the spreader of the swinging chuck: 27, a lever for shifting the carriage of the swinging arm in its guideway: 28, a link connecting this lever with the carriage: 29, a pin and slot forming a lost motion connection between the link and the carriage so that the link may have some degree of motion without affecting the carriage: 30, a swinging latch carried by the bed and adapted, when engaged, to hold the swinging arm in position with the axis of the swinging chuck in line with the axis of the slidingchuck: 31, a lug carried by the headstock and adapted, when the headstock is shifted to position against stopscrew 20, to strike and release latch 30 from the swinging arm: 32, a normally idle hook at the heel of the swinging arm at some distance outwardly from the center of its pivot 24: 33, a normally idle hook carried by the link 28 and adapted to latch with hook 32 when the swinging arm shall have swung round through an angle of ninety degrees outwardly: 34, a steady-rest in the form of a ring nose presenting itself within the headstock and rigidly supported by the bed of the machine, the functional or nose part of the bore of this steadyrest having a diameter equal to that of the outside of the tube to be dealt with, the axis of this bore coinciding with that of the sliding chuck: 35, a bracket carried fixedly by the bed near its tail end: 36, a rod having its tail end supported by this bracket, the .rod extending axially through the sliding-chuck, which is capable of sliding upon it, and the front end of the rod extending into the headstock along with the nose of the steadyrest: 37, a disk fast on the inner end of this rod and having a diameter suited to the inside of the tube to be dealt with, the front face of this disk coming substantially even with the face of the nose of the steady-rest: 38, the corrugating tool, in the form of a ring thin at its inner portion and having a bore with a diameter equaling or exceeding that of the outside of the tube to be dealt with, this ring tool being carried by the driving gear of the head-stock, the inner thin portion of the tool coming a very short distance forward of the face of steady-rest 34 and disk 37 39, a carrier mounted eccentrieally within driving ring 11 and carrying corrugating tool 38, which latter is journaled freely within the carrier: 40, slotted lug and bolt devices for securing the tool carrier within driving ring 11 and for providing an adjustment for the degree of eccentricity and angularity of the carrier relative to the driving ring, the corrugating tool ring being set at a slight angle to the plane of revolution of the driving-ring: 41, a circumferential series of rolls forming a roller bearing where the corrugating tool-ring 38 is journaled in the tool carrier 39: 42, a bevel formed on the front face of disk 37, at the side furthest from stop-screw 20, this bevel extending about half way round the disk and tapering forwardly to nothing: 43, a longitudinal rack fast with the tailstock: 44, a cross-shaft journaled in the bearing: 45, a gear fast on this shaft and engaging the rack; 46, a second cross-shaft: 47, a pinion loose on this second cross-shaft and engaging gear 45: 48, a Worm wheel fast on the second cross-shaft: 49, a worm fast on driving shaft 13 and engaging the worm-wheel: 50, a clutch to serve in locking pinion 47 to the second cross-shaft: 5], a lever fol engaging and disengaging this clutch: 52, a rod connected with the stop-clutch which is to control the running of the machine: 53, a lever attached to this rod, to serve in throwing the stop-clutch into action when the machine is to start: 54, a spring connected with this lever and serving, when the lever is free, to so operate upon the stop-clutch as to bring the machine to rest: 55, a trigger mounted on the bed and adapted to be so set as to hold lever 53 in position correspoinling with the active position of the stop-clutch and the running condition of the machine: 56, a dog carried by the tailstock and adapted, when the tailstock shall have moved a proper distance toward the headstock, to engage the trigger and release lever 53 and cause spring 54 to act in bringing the machine to rest: 57, an enlargement fast upon the tail end of the driving shalt, gear 15 running loosely upon this enlargement, which enlargement is virtually a part of the shaft: 53, a rotary pin mounted in the enlargement, parallel with the shaft and at such distance therefrom as to project half of its body transversely into a longitudinal semicircular groove in the bore of gear 15, about one-half the diameter of the pin being cut away so that. when the pin is turned to one position, as seen in Figs. 3, 5) and 10, the gear will be free to turn on the enlargement, while if turned to the position indicated by dotted line in Fig. 10, the pin will serve as a key locking the gear to the enlargement and consequently to the drivingsha l t: 59, a radial arm fast on the forward end of the pin: (it), a spring acting on this arm and tending to turn the pin to position of action as a driving key: (it, a stop carried by the enlargement to limit the motion of the pin arm to position corresponding with active position of the pin: 62, a lever pivoted to the frame of the machine and having rod 52 connected with it, the free end of this lever being adapted to swing in front of arm 30 and cause that arm to turn the pin to idle position: (52;, a spring plunger cooperating with lever (52 to give the level a lively quick action in swinging from active position: and 64, a stop carried by the enlargenunit to arrest arm 59 with the key-pin in idle position.

Before going into what might be called the retine ments of the action of the machine it may be well to dispose of a number of its general movements and details.

When the machine is in operation the sliding clntt h (i feeds toward the headstock at a rate determined by the proportion of the gearing which operates it, and in accordance with the pitch of the helix represmitcd by the corrugating. The throwing of clutch 50 into engagement causes the forward feed of the sliding chuck to begin and to proceed at such rate that each turn of the corrugating tool corresponds with one pitch-unit of advance for the sliding chuck. (hitch 50 is to be disengaged when the taihstock is to be shift ed rearward, or otherwise moved by hand.

The stop-clutch is without individual novelty, the particular construction illustrated representing an ex ample well known in this class of devices.

Turning to Fig. 1, spring 54 holds lever (52 in the position shown, under which condition the key-pin is in idle position and gear 15 loose rclative to the drivingshaft and the machine at rest. If lever 53 be thrown to the right and there held by trigger 55, lever (52 will se /38o leave the stop-clutch and the key-pin will go to active I at the side of the tube nearest stop-screw 20, and the exposition, locking gear 15 to the driving shaft and starting the eorrugating tool into rotation and the sliding chuck into advance toward the headstock. When the tail-stock shall have advanced to the point where the corrugating of the tube is to cease, then dog 56 releases the trigger and thereupon spring 54 throws lever 62 into action upon the stop-clutch, whereupon the keypin goes to idle position and the machine comes to rest at a sharply defined point in the rotation of the corru gating tool, gear 15 proceeding to turn idly relative to the drivingshaft.

Turning to Fig. 3, the swinging arm and the swinging chuck carried by it are in such position that the chuck is in line with the general axis of the machine and the arm is there latched by latch 30. If, now, the head stock be shifted a trifle to the left latch 30 will disengage and leave the swinging arm and swinging clutch free to swing round through an angle of ninety degrees. When the swinging arm completes this degree of motion its hook 32 strikes hook 33 and pushes link 28 to the right and takes up position to be engaged by hook 33. Then, when lever 27 is moved to the left, link hook 33 engages hook 32, before any movement of carriage 22 takes place, and then, when the lever is further moved, the carriage moves to the left and moves the swinging arm and swinging chuck with it in a direction at right angles to the general axis of the machine.

Looking again at Fig. 3, the headstock is over against stop-screw 19, having been put there by action on lever 21. This is not a working position for the headstock but is a temporary position into which the headstock is to be put when the blank tube is to be inserted in the machine. When the machine is charged and ready for work, then lever 21 is turned down, thus forcing the headstock to working position against stop-screw 20. These stops, being in screw form, provide for desirable but not essential adjustment.

' The two chucks will have functional diameters suited to the size of tube to be dealt with, and so also will the corrugating tool, and these devices will be changed as needed.

Now, taking up the action of the corrugating tool, it may be Well to first consider it in a hypothetical simplified form. In Fig. 2 the corrugating tool 38 is a complete ring and is shown in position concentric with the chucks and disk and steady-rest. This position of the corrugating tool being the non-working or temporary work-inserting position. After the tube has been inserted then the entire corrugating head is moved against stop-screw 20 which will cause the distant edge of the bore of the corrugating tool to slightly indent the tube. Assume this distant edge, instead of being part of a ring, to be simply a thin finger projecting inwardly its present distance from the driving ring 11. Now, with this understanding, it will be apprehended that, after the headstock isshifted against stop-screw 20, the finger will turn in an orbit eccentric to the axis of the tube. The consequence is that the finger, making but slight indentation in the metal of the tube at the point most distant from stop-screw 20, will work deeper and deeper as it approaches that stop-screw and then work shallower and shallower as it goes back to normal position. The finger will thus have produced a truly circumferential corrugation very much deeper tra metal taken up in forming the deeper portion of the corrugation will bring about a bending of the tube, its longer side being toward stop-screw 19. If, one of those corrugations having been produced, the tube be advanced and a second corrugation be produced, there will be a further curving of the tube, and the ultimate result would be a tube curved after the manner of ordinary corrugated stove pipe elbows.

Still considering the corrugating too] as a 1n ere finger, it will be understood that the tube is steadied to the rear of the finger by the nose of the steady-rest outside the tube and by the disk inside the tube, the latter forming an abutment or counter-die so to speak, for the action of the finger. If the disk were unbeveled, the successive corrugations at the convex side of the curved tube, would take on a ratchet character, not harmful but decidedly unpleasing. By beveling the disk as at 42, this ratchet form of corrugation is avoided and the two sides of each corrugation may be given symmetrical angles.

Still considering the corrugating tool as a finger, and still considering the corrugations as purely circumferential, the finger would be found to be subject to great wear and generally unsatisiactory performance and it would be found particularly liable to rub or tear or cut the metal of the tube, in other words, the assumed finger would be anaggressive rubbing tool to produce the corrugations. But by giving to the corrugating tool the complete ring form, in lieu of a finger, and by mounting the corrugating ring loosely in its carrier 39, the operation becomes changed entirely for there need no longer be any rubbing action and the corrugations may be produced by action of direct pressure. The roller bearing 41 is introduced to enhance the freedom of the corrugating ring tool relative to its carrier. 7

In the operation of the machine the corrugating ring may be considered as entirely non-rotary, its only motion being that of being carried in an eccentric orbit, all portions of the bore of the ring tool acting in succession upon the tube in producing the corrugationv Thus far purely circumferential corrugating has been considered, while this machine is designed principally for producing helical corrugations by continuous as distinguished from intermittent action of the machine. Carrier 39 is to be shifted in the driving ring so that the inner edge of the corrugating ring is at a slight angle to the plane of revolution of the driving-ring, the degree of the angle being dependent upon the pitch selected for the helix. This angle, as well as the degree of eccentricity of action, can. be adjusted at the lugs 40.

Thus understanding the general details and general action of the machine it is believed that its entire working for its best results can be easily followed.

Let the machine be at rest and empty; move the sliding chuck clear to the left; I shift the headstock against stop-screw l9, bringing the bore of the corru-.

gating ring concentric with the axis of the chuck and steady-rest and disk; move the carriage of the swing ing arm to the rear, toward stop-screw 19; set the swinging arm so its chuck is in line with the sliding chuck and there latch it by means of latch 30; open both chucks; take the blank tube and open its seam so the blank can be gotten over rod 36 between the headstock and the sliding chuck, let the seam-point of the blank tube be toward stop-screw 20; pass the tube over disk 37 and within the nose of the steady-rest and through the corrugating ring and into the swinging chuck, and clamp the swinging chuck upon it; the projection oi the right-hand end oi the tube past the corrugatiug ring should be equal to the distance desired from the end of the tube to the beginning of the corrugations; move the sliding chuck to the right and clamp it to the iree end of the tube; operate lever 21 and bring the headstock against stop-screw 20, which will cause the corrugating ring to make a minor indentation in the side ol' the tube away from the seam; the shiiting of the headstock has released latch 30 so that the swinging arm and chuck are free for swinging movement; throw clutch 50 so that the feed-work is in condition for action; throw lever 53 and lock it by means oi the trigger, thus starting the machine into motion. The action oi the corrugating ring results in the production of a generally circumi'erential corrugation, while the eniorced l'orward feeding of the tube, in conjunction with the angular setting oi the corrugating ring, modilies the course of the corrugation into a helix, and if the eorrugating was oi equal depth all around the tube the result would be a helically corrugated straight tube. As the corrugating proceeds, the curving oi the tube causes the swinging chuck to move in an are. When the corrugating has proceeded the desired distance then, by the action of dog 56, the machine automatically comes to rest and the swinging arm is in position to have its hook engage the link hook. The swinging chuck is now to be loosened and, upon pulling outward on lever 27, the first effect is to latch the swinging arm to the link and the next el'iect is to move the carriage and swinging arm and swinging chuck and pull the latter off ol' the end of the curved tube which is still in the machine. The sliding chuck is now to be released and the completed curved pipe Withdrawn endwise from the machine.

The exemplifying machine, in producing curved pipes by corrugations in the term oi a continuous helix permits 01 extremely rapid production and yields an admirable product in which the metal entering into the corrugations is remarkably l'ree irom destructive action by direct corrugating agent, and the working oi the machine being continuous is free irom damaging shocks, and the wear and tear on the various parts is reduced to a minimum.

Some of the sub-mechanisms embodied in the ex emplifying machine will be iound useful in other associations in machines of the same general class and it will th ere tore be understood that various changes and inedifications may suggest themselves to the constructive mechanic. So far as the present specification is concerned, I have simply set [01th the principle oi my invention, together with a description oi a machine embodying the best mode in which I at present contemplate employing that principle.

I claim 1. A pipe-curving machine comprising a bed, corrugating mechanism mounted thereon for carrying an inwardly acting corrugating tool around a tube in an orbit eccen' tric to the axis 01 the tube, a fixed disk to the rear of said tool, a steady-rest nose surrounding the disk, a sliding chuck adapted to hold the terminal end of the tube and to be advanced toward the corrugating mechanism, a swinging chuck with its axis coinciding with that of the tube, and an arm carrying the swinging chuck and mount' ed for swinging motion on a pivot at right angles to and at one side ol.- the axis of the sliding chuck, combined substantially as set forth.

ll. A pipe'curving machine comprising a. bed, corrugating mechanism mounted thereon for carrying an inwardly acting corrugaiing tool around a. tube in an orbit eccentric to the axis of the tube, a fixed disk to the rear of. said tool. a. stea1lyrcst nose surrounding the disk, a sliding chuck adapted to hold the terminal end of the tube and to be advanced toward the corrugating mechanism, feeding mechanism for progrt sively and continuously advancing the sliding chuck toward the corrugating mechanism, a swinging chuck with its axis coinciding with that of the sliding chuck and adapted to hold the initial end of the tube, and an arm carrying the swinging chuck and mounted for swinging molion on a. pivot at right angles to and at one side (11' the axis ot' the sliding chuck, combined substantially as set forth.

3, A pipecurving machine comprising a bed, corrugat ing mechanism mounted thereon for carrying an inwardly acting corrugaiing tool around a tube in an orbit eccentric to the ax" oi the tube, a iixed disk to the rear of said tool, a steadyest nose surrounding the disk, a sliding chuck adapted to hold the terminal end oi the tube and to be advanced toward the corrugating mechanism, feeding mechanism for advancing the sliding chuck toward the cerrugati mechanism, a driving device connected with the feeding mechanism, a stop-clutch between the driving device and feeding mechanism for imparting motion from the former to the latter, a. handcontrolled shitting piece for throwing the stop-clutch into action so as to connect the feeding mechanism with the driving device, a spring acting on the shitting piece and tending to hold the stopclulch in condition disconnecting the driving device from the feed mechanism, a trigger to hold the shifting piece in position corresponding with the condition of connection between the driving device and feed mechanism, a dog moving with the sliding chuck and adapted to release the trigger when the sliding chuck has moved a given distance toward the corrugaling mechanism, a swinging chuck with its axis coinciding with that oi the sliding chuck and adapted to hold the initial end ol the tube, and an arm carrying the swinging chuck and mounted for swinging motion on a pivot at. right angles to and at one side of the axis of the sliding chuck, combined substantially as set forth.

l. A pipe-curving machine comprising a bed, corru i tric to the axis oi" the tube, a fixed disk to the rear of said tool, asteadyaest nose surrounding the disk, a. sliding chuck adapted to hold the terminal end oi the tube and to be advanced toward the corrugaiing mechanism, a. swing ing chuck with its axis coincidingwiih that ot the sliding chuck and adapted to hold the initial end of the tube, an arm carrying the swinging chuck and mounted for swinging motion on a pivot at right ang 's to and at one side of the axis of the sliding chuck, a driving device for trans mitting rotation to the corrugating mechanism, a stopcluich between the driving deuce and corrugating mechanism for transmitting motion lrom the former to the latter, a. lmnd-controlled shitting piece for putting the stopclutch to active condition in transmitting motion, a spring acting on the shifting piece and tending to put the stopclutch to condition disconnecting the power device from the corrugating mechanism, a trigger to hold the shifting piece in adyusted position against the resistance 011 the spring, and a dog moving with the sliding chuck and adapted to release the trigger when the sliding chuck shall have moved a given distance toward the corrugatiug mechanism, combined substantially as set iforth.

5. A pipecurving machine comprising a bed, corrugating mechanism mounted thereon for carrying an inwardly acting corrugating tool around a tube in an orbit eccentric to the axis oi the tube, a Iixed disk to the rear of. said tool, a steadyrest nose surrounding the disk, a sliding chuck adapted to hold the terminal end oi. the tube and to be advanced toward the corrugating mechanism, a swingsliding chuck and adapted to hold the initial end of the ing chuck with its axis coinciding with that oi the sliding chuck and adapted to hold the initial end of the tube, an arm carrying the swinging chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the sliding chuck, a carriage supporting said arm and adapted for movement in a direction at right angles to the axis of the sliding chuck, and hand mechanism for shifting said carriage, combined substantially as set forth.

6. A pipe-curving machine comprising a bed, corrugating mechanism mounted thereon for carrying; an inwardly acting corrugating tool around a tube in an orbit eccentric to the axis of the tube, a fixed disk to the rear of said tool, a steady-rest nose surrounding the disk, a sliding chuck adapted to hold the terminal end of the tube and to be advanced toward the corrugating mechanism, a swinging chuck with its axis coinciding with that of the sliding chuck and adapted to hold the initial end of the tube, an arm carrying the swinging chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the sliding chuck, a carriage supporting said arm and adapted for movement in a direction at right angles to the axis of the sliding chuck, hand mechanism for shifting said carriage, and a latch engaging saidarm and adapted to temporarily hold the arm in such position that the swinging chuck is in line with the sliding chuck, combined substantially as set forth.

7. A pipe-curving machine comprising a bed, corrugating mechanism mounted thereon for carrying an in wardly acting corrugating tool around a tube in an orbit eccentric to the axis of the tube, a fixed disk to the rear of said tool, a steady-rest nose surrounding the disk, a sliding chuck adapted to hold the terminal end of the tube and to be advanced toward the corrugating mechanism, a swinging chuck with its axis coinciding with that of the sliding chuck and adapted to hold the initial end of the tube, an arm carrying the swinging chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the sliding chuck, a carriage supporting said arm and adapted for movement in a direction at right angles to the axis of the sliding chuck, hand mechanism for shifting said carriage, a latch engaging said arm and adapted to temporarily hold the arm in such position that the swinging chuck is in line with the sliding chuck, a shifting device for moving the corrugating mechanism transversely of the axis of the sliding chuck, and a projection shifting with the corrugating mechanism and adapted to engage and release said latch when the corrugating mechanism is moved into working position, combined substantially as set forth.

8. A pipe-curving machine comprising a bed, corrugating mechanism mounted thereon for carrying an inwardly acting corrugating tool around a tube in an orbit eccentric to the axis of the tube, a fixed disk to the rear of said tool, a steady-rest nose surrounding the disk, a sliding chuck adapted to hold the terminal end of the tube and to be advanced toward the corrugating mechanism, a swinging chuck with its axis coinciding with that of the sliding chuck and adapted to hold .the initial end of the tube, an arm carrying the swinging chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the sliding chuck, a carriage supporting said arm and adapted for movement at right angles to the axis of the sliding chuck, hand mechanism for shifting said carriage, and a latching device adapted to hold the arm in position with the axis of the swingtube and to be advanced toward the corrugating mechanism, a swinging chuck with its axis coinciding with that of the sliding chuck and adapted to hold the initial end of the tube, an arm carrying the swinging chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the sliding chuck, a carriage supporting the arm and adapted for movement to and from the axis of the sliding chuck, a hand lever for shifting the carriage, a link connecting said lever with the carriage and adapted for a limited degree of motion independent of the carriage, a latch-part carried by the link, and a latch-part carried by the arm and adapted to engage with the latch-part on the link when the arm has moved the swinging chuck to position with its axis at right angles to the axis of the sliding chuck, combined substantially as set forth.

10. A pipe-curving machine comprising a bed, transversely adjustable corrugating mechanism mounted thereon for carrying an inwardly acting corrugating tool around a tube in an orbit eccentric to the axis of the tube, a fixed disk to the rear of said tool, a steady-rest nose surrounding the disk, a sliding chuck adapted to hold the terminal end of the tube and to be advanced toward the corrugating mechanism, a swinging chuck with its axis coinciding with that of the sliding chuck and adapted to hold the initial end of the tube, an arm carrying the swinging chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the sliding chuck, stops to limit the transverse adjustment of, the corrugating mechanism, and a hand operative device for shifting the corrugating mechanism to and from said stops and locking it against one of said stops, combined substantially as set forth.

11. A pipe-curving machine comprising a bed, corrugating mechanism mounted thereon for carrying an inwardly acting corrugating tool around a tube in an orbit eccentric to the axis of the tube, a fixed disk to the rear of said tool, a steady-rest nose surrounding the disk, a sliding chuck adapted to hold the terminal end of the tube and to be advanced toward the corrugating mechanism, a swinging chuck with its axis coinciding with that of the sliding chuck and adapted to hold the initial end of the tube, an arm carrying the swinging chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the sliding chuck, a driving device, transmitting mechanism connecting the driving device and corrugating mechanism, transmitting mechanism connecting the driving device and sliding chuck for automatically advancing the latter, and a hand-operative clutch interposed in the transmitting mechanism between the power device and sliding chuck to permit the sliding chuck to be released from the power device and be moved to and from the corrugating mechanismby hand, combined substantially as set forth.

12. A pipe curving machine comprising a bed, corrugating mechanism mounted thereon for carrying an in wardly acting corrugating tool around the tube in an orbit eccentric to the axis of the tube, a fixed disk to the rear of said tool, a steady-rest nose surrounding the disk, a chuck ring disposed with its axis parallel with the axis of the corrugating mechanism and adapted to fit the exterior of the terminal end of the tube, an expansihle plug disposed within the ring and adapted to clamp the tube therein, a conical spreader disposed within the plug, a handle for drawing the spreader endwise and expanding the plug, said ring, plug, spreader and handle constituting a chuck for the terminal end of the tube, a carrier supporting said chuck and adapted to advance the chuck toward the corrugating mechanism, an arm mounted for swinging motion on a pivot at right angles of the axis of said sliding chuck, and a chuck similar to said sliding chuck but supported on said arm, combined substantially as set forth.

13. A pipe-curving machine comprising a bed, corrugat ing mechanism mounted thereon for carrying an inwardly acting corrugating tool around a tube in an orbit eccentric to the axis of the tube, a disk fixedly supported to the rear of said tool and having its face toward the tool beveled throughout a portion of its periphery, a steady-rest nose surrounding the disk, a sliding chuck adapted to hold the terminal end of the tube and to be advanced toward the corrugating mechanism, a swinging chuck with its axis coinciding with that of the sliding chuck and adapted to hold the initial end of the tube, and an arm carrying the swinging chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the sliding chuck, combined substantially as set forth.

14. A pipecurving machine comprising a bed, a chuck to hold the terminal end of a tube and adapted for sliding motion axially of the tube, a second chuck to hold the initial end of the tube in line with the first-mentioned chuck, an arm carrying the second chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the first-mentioned chuck, a disk fixedly supported between the two chucks concentric with the axis of the firstmentioned chuck, a steady-rest nose surrounding the disk, a bearing disposed between the two chucks and with its axis eccentric to the axis of the disk, a driving-ring mounted for rotation in said bearing, and a corrugating tool carried by said driving ring and presenting a thin inwardly-acting edge in advance of the steady-rest nose, combined substantially as set forth.

15. A.pipe-curving machine comprising a bed, a chuck to hold the terminal of a tube and adapted for sliding motion axially of the tube, a second chuck to hold the initial end of the tube in line with the firstn1entioned chuck, an arm carrying the second chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the first-mentioned chuck, a disk fixedly supported between the two chucks concentric with the axis of the first mentioned chuck, a steady-rest nose surrounding the disk, a bearing disposed between the two chucks and with its axis eccentric to the axis of the disk, a driving-ring mounted for rotation in said bearing, a carrier within said driving-ring, means for adjusting the position of the carrier in the driving-ring, and a corrugating tool carried by said carrier and presenting a thin inwardly-acting edge in advance of the steady-rest nose, combined substantially as set forth.

16. A pipe-curving machine comprising a bed, a chuck to hold the terminal end of a tube and adapted for sliding motion axially of the tube, a second chuck to hold the initial end of the tube in line with the first-mentioned chuck, an arm carrying the second chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the first-mentioned chuck, a disk fixedly supported between the two chucks concentric with the axis of the first-mentioned chuck, a steady-rest nose surrounding the disk, a bearing disposed between the two chucks and with its axis eccentric to the axis of the disk, a drivinga-ing mounted for rotation in said bearing, a carrier secured within the driving-ring and formed with a bearing eccentric to the axis of the drivinga'ing, a ring tool disposed within said last-mentioned bearing and presenting a thin inner edge in advance of the steady-rest nose, and means for adjusting the eccentricity and angularity of said thin inner edge relative to the driving-ring, combined substantially as set forth.

17. A pipe-curving machine comprising a bed, a chuck to hold the terminal end of a tube and adapted for sliding motion axially of the tube, a second chuck to hold the initial end of the tube in line with the lirst-mentioncil chuck, an arm carrying the second chuck and mounted for swinging motion on a pivot at right angles to and at one side of the axis of the first-mentioned chuck, a disk fixedly supported between the two chucks concentric with the axis of the first-mentioned chuck, a steadya-est nose surrounding. the disk, a bearing disposed between the two chucks and with its axis eccentric to the axis of the disk, a driving-ring mounted for rotation in said bearing, a car rier secured within the drivinga'ing and formed with a bearing eccentric to the axis of the drivingaing. ringtool disposed within said iast1ne11tioned bearing presenting a thin inner edge in advance of the rest nose, an annular series of rolls between the rin, and its bearing, and means for adjusting the eccentricity and angularity of said thin inner edge relative to the driving-ring, combined substantially as set forth.

18. A pipe-curving machine comprising a bed, a chuck to hold the terminal end of a. tube and adapted for sliding motion axially of the tube, a second chuck to hold the initial end of the tube in line with the lirst-nienlionod chuck, an arm carrying the second chuck and mounted for swinging motion on a pivot at right angles to and at one side 01 the axis 01' the lirstanentioned chuck, a disk lixcdly supported between the two chucks concentric with the axis of the first-mentioned chuck, a stead vrest nose surrounding the disk, a bearing disposed between the two chucks and with its axis ecceulric to the axis of the disk and mounted for adjustment transversely ol' the axis oi the tube, a driving-ring mounted for rotation in said hearing, a ring-tool mounted eccenlrically within the drivingring and presenting a thin inner edge in advance of. the steady-rest nose, means for shifting said bearing trans versely of the tube, stops to limit the transverse shitting movement of said bearing, and a locking device to hold said bearing in shifted position against one of said stops, combined substantially as set forth.

1!). A pipe curving machine comprising a device for clamping and advancing the terminal end of the tube. a device for clamping the initial end of the lube and sup porting it in movement through a curved path as the tube is bent, a disk to inleriorly support an intermediate portion of the tube, a steady-rest nose surrounding the disk, a ringtool surrounding the tube in advance of the steady-rest nose. mechanism for supporting the ring-tool and carrying it in a circular orbit eccentr c to the axis of the disk, and mechanism for progressively and continuously advancing the clamping device at the terminal end of the tube, combined substantially as set iforth.

WILLIAM CLARK KIRK.

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