US1285334A - Die-stock. - Google Patents

Description

I. NONNEMAN.

DIE STOCK.

APPLICATION FILED muxa. 1917.

Patented N0vf19, 1918..

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I. W. NONNEIVIAN.

DIE STOCK.

APPLICATION FILED IAN. BI 1911.

l ,285,334. latextad Nov. 19, 1918.

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INIED TATE FFIENT FFIQE.

IRA W. NONNEMAN, OF WARREN, OHIO, ASSIGNOR TO THE BORDEN COMPANY, OF

WARREN, onio,

A CORPORATION OF OHIO.

DIE-STOCK.

Application filed January 8, 1917.

To all Lc/wm t may concer/n: I

Be it known that I, IRA TW. NONNEMAN, a citizen of the United States, residing at lVarren, in the county of 'Irumbull and State of Ohio, have invented a certain new and useful Improvement in Die-Stocks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to die stocks of the type wherein the dies or chasers gradually recede as the thread is being cut, whereby a tapered thread may be produced on a pipe or other cylindrical article. The object of the invention is to produce such a die stock, which, while being accurate in its cutting operation and durable in service, shall consist of comparatively few parts and be cheap to construct.

My die stock comprises briefly a nonrotating guide having a tapered thread selected as to its taper and pitch with reference to the thread to be cut on the pipe, a rotating member carrying movable chasers, and connecting mechanism between such chasers andthe thread on the guide, whereby the proper control of the movement of the chasers is effected as the rotation of the die stock progresses. In embodying the above idea I prefer to make my threaded guide in the form of a sleeve adapted to extend around the pipe, and having external threads, and I provide nuts engaging these threads and maintained in contact therewith, and intermediately pivoted levers connecting these nuts with the chasers, whereby as the cutting progresses the nuts move gradually inward and the chasers correspondingly outward. My invention is hereinafter more fully explained in connection with the embodiment shown in the drawings, and the essential characteristics are summarized in the claims.

In the drawings, Figure 1 is an end elevation of my die stock, the operating handles being broken away; Fig. 2 is a substantially axial section through the die stock, two diametrically positioned chasers and their le vers being shown in side elevation; Fig. 3 is in the nature of a plan of the die stock, being a cross section on line 3-8 of Fig. 1, looking toward the axis of the die stock; Fig. 4 is an elevation from the opposite direction to Fig. 1, illustrating the work Specicaton of Letters Patent.

, with the Patented Nov. 19, 1918.

Serial' No. 141,122.

holder clamping a smaller sized pipe; Fig. 5 is a detail of the work holder, being a cross section on the' line 5-5 of Fig. 4; Fig. 6 is a fragmentary cross section through the threaded guide and one of the cooperating nuts.

In the drawings Figs. l, 2 and 3, A indicates a pipe adapted to be cut by the die stock shown. The dies or chasers `for cutting the thread on this pipe are designated 10. Four of them are shown arranged radially about an axis, which in use is coincident with the axis of the pipe. These chasers are mounted in radial housings carried by a rotatable frame 12. rIhis frame is a plate-like member, and the housing may readily consist of flanges or ribs 13, integral n frame, as shown in Fig. 3, and a small plate 14, fastened by screws to the ribs. The frame plate 12 carries suitable sockets 15, which are preferably internally threaded and receive the ends of the operating handles 16, by which the plate, with its chasers, may conveniently be rotated.

The guide which determines the position of the chasers with reference to the axis of the die stock, is shown as a sleeve positioned in axial alinement with the chaser frame referred to, and adapted to be clamped to the pipe, and having external tapered threads 21 corresponding in pitch to the thread to be cut. The tapered threads 21 are preferably formed on the exterior of the guide, and with these threads mesh the threads of riders or arcual nuts 30, which are connected by intermediately pivoted levers 31 with the chasers 10. It results from this construction that when the sleeve 2O is clamped to the pipe and the chaser frame 12 rotated, the partial nuts 30 may travel inwardly as they progress, and this will swing outwardly the other ends of the levers 31 and allow the chasers to recede and cut a tapered thread on the pipe.

rIhe taper of the thread 21 on the guide is proportional to the taper to be cut on the pipe. I deem it simplest, however, to make the taper on the guide not only proportional to the thread to be cut, but actually of the same taper. In this case the levers 31 will be pivoted at their centers, so that the actual Aoutward movement of the chasers will be which sim ply l changes the direction of movement, I Ymay cut the thread on the guide to a standard pitch and taper exactly corresponding to the taper to be cut by the chasers.

To protect the thread 21, as well as to maintain the nuts in engagement therewith when the die-stock is not in use, I provide a sleeve 40` rotatably mounted on Ythe guide 20 and overhanging the thread 21. The sleeve has its interior tapered correspondto that of the thread 21 and has longitudinal slots 42 providing spaces for the lever connection to the chasers.

Referring more specifically to the details of the embodiment shown in the drawings, it will be seen by reference to Figs. 2 and 3 that the chaser .frame has pairs of ears 17 on its rear face between the individuals of which pairs lie the levers 31. These levers are pivoted at their centers to these ears by pins 33. At their forward ends the levers overhang shoulders 18 on the chasers, there being' openings 19 through the frame plate 11 to allow the passage of the levers. At this point clearance is provided, as by cutting away the outer edge of the lever, thus allowing these levers to swing outwardly.

vThe nuts 30 extend arcually for some distance about the sleeve 2O to obtain a good threaded engagement with' it. Each nut has two outwardly extending ears 35 which extend through the slot 42 in the sleeve 40. The lever 31 extends between the ears 35 and is pivoted thereto by a pin 37. The ears 17 on the chaser frame extend close to the ears 35, so that the levers 31 are in eect housed between the pairsof ears, and no bending or undesirable loosening is possible.

rlhe guide sleeve 2O is shown in Fig. 2 as having a flange 23 at its forward end limiting the outward movement of the nuts 30. At the rear of the thread 21 the sleeve has a flange 24 and at the rear of this flange a cylindrical portion 25. rIhe protecting sleeve 40 has at its rear end an inwardly extending flange 44, which closely surrounds the surface 25 and bears against the flange 24. The sleeve 40 is maintained in position, while allowed to rotate about the stationary guiding sleeve 20, by means of a collar 50 secured on the cylindrical surface 25. I find it simple and economical to secure the collar 50 to the sleeve 20 by the same means which clamps the sleeve to the pipeL to be threaded. This clamping device will now be described, though it is claimed in my divisional application No. 159.643, filed April 4, 1917.

Carried radially by the collar 50 are plungers 60, two being shown in Fig. 4, one hundred and twenty degrees apart. At a point one hundred and twenty degrees from each of these'plungers is shown a set screw 62, screwing radially through the collar. These three members are adapted to clamp the pipe, center the die stock, and lock the .useithe'set screw 62 to the sleeve.

As pipes have certain standard sizes, I prefer to make the plungers 60 adjustable by definite steps, according to such sizes, and positively tighten the clamp on the pipe. Fig. 4 illustrates a pipe A', which may be taken as the smallest size with which the particular die stoel; shown is adapted to be used. y The pipe A inl Figs. 1

and 3 may be considered the largest size, and.

we may suppose that there are two intermediate sizes. To enable adjustments for such four sizes, I form four shoulders 65 in the cylindrical surface of the plungers 60. Any one of these shoulders is adapted to be Vengaged by a locking' plunger 66, having a nose 67 and contained in a housing 53 carried by the collar 50. The locking plunger 66 is pressed toward the clamping plunger 60 by a compression spring 68 in the housing 53, the thrust of the spring being taken by a screw 69.

The plungers 60 are preferably knurled at their outer ends, as shown at 64, whereby they may be conveniently turned about their axes. When so turned the locking plunger 66 is thereby cammed backwardly, and the plunger 60 may be moved inwardly or outwardly by hand. The notches 65 are arranged in stepped relation, so that when the plunger 60 is turned slightly and moved axially the nose 67 of the locking plunger will come into the next notch 65. By positioning these notches 65 at different portions of the cylindrical surface of the plunger 60 and arranging their shoulders at proper distances from the inner ends of the plungers, they may be readily changed by a simple finger operation from one size of pipe to@ another.

To change the die stock for operation on different sized pipe, it is only necessary to change the work clamp, as above described,

and to change the chasers 10. The notches l1 in these chasers, which the ends of the levers 31 occupyextend continuously to the outer end of the chasers so that the chasers may be shoved readily inward out of the housing. To prevent chasers dropping out of their housings when the die stock is not in use I prefer to provide a spring detent connection between the chasers and their operating levers. A convenient form of this consists of a ball 7 0 set into a recess in the end of the lever 31 and pressed against the chaser by a compression spring 71 contained within the recess. A slight depression is made in the chaser for the ball to occupy, and this provides sufficient friction so that the chaser will not drop out but may be readily .shoved out whenever desired. The ball and spring are prevented from escaping mounted in said lfrom their recesses by the end portion of the lever 3l, which is peened over the ball after it and the spring are inserted.

It will be seen that my die stock is composed of very few parts, is simple and cheap to construct, that there is nothing about it to get out of order. The change ot' the die stock for various sizes of pipe within its range may be made very quickly. By providing the tapered threaded guide for controlling the outward movement of the chasers this movement may be absolutely accurate from beginning tor end, producing a perfect tapered cut on the pipe.

Having thus described my invention, what I claim is:

l. In a die stock, the combination of a sleeve adapted to be clamped to the work and provided with an ex-Ltern'althread having a pitch and taper corresponding to the thread to be cut, a rotat( ble frame, chasers movably frame, individually threaded riders engaging said stationaryvexternal thread, and connecting mechanism between the riders and the chasers lfor controlling the recession of the chasers according to the taperof the thread on the sleeve.

Q. In a die stock, the combination of: a guide having a tapered thread, a relatively rotating member, a movable chaser, carried thereby, a rider engaging the ltapered thread on the guide, and a lever connecting` said rider with the Chaser.

3. In a die stock, the combination of a guide sleeve having a tapered thread of a pitch and taper proportional to that of the thread to be cut, a relatively rotatable member having thread-cutting chasers, incomplete nuts engaging the thread 'on the guide, and levers connected respectively with said nuts at one end and with the chaser` at the other end and intermediately pivoted to said rotatable member.

4. The combination of a guide sleeve having an external tapered thread, means for holding said sleeve stationary on a pipe to be threaded, a rotatable member, chasers carried thereby, an incomplete nut for each chaser engaging the thread on the guide, and lever mechanism connecting each nut with its chaser.

5. In a die stock, the combination of a stationary guide sleeve having an external tapered thread of a pitch and taper correspending to that of the thread to be cut, a relatively rotatable member having threadcutting chasers incomplete nuts engaging the thread on Vvthe guide, and levers connected respectively with said nuts at one end and the chaser at the other and intermediately pivoted at their centers to said rotatable member.

6. In a die stock, the `combination of a Guide having a tapered thread, a rider ena gaging such thread, a chaser, a rotatable frame carrying it, mechanism connecting the chaser with the rider, and means for preventing the rider passing out of engagement with the tapered thread on the sleeve when the die stock is idle. A

7 In a die stock, the combination ot a guide having a tapered thread, a rider engaging such thread, a chaser, a rotatable trame carrying it, mechanism connecting the chaser with the rider, and a rotatable device having a taper corresponding to the taper ot the thread on the sleeve and serving to keep the rider in engagement therewith. V S. In a die stock, the combination of a guide sleeve having an external tapered thread, a rotatable sleeve surrounding the guide sleeve and having longitudinal slots in it, an arcual nut between the rotatable sleeve and the guide sleeve having threads engaging the guide sleeve, a chaser adapted to revolve about the axis of the die stock, and connecting mechanism between said Chaser and said nut. i

9. In a die stock, the ,combination 'of a guide sleeve having an external tapered thread, a protecting sleeve surrounding the guide sleeve and having its internal surface tapered correspondingly to that. o1'l the thread and having longitudinal slots through it, arcual nuts between the protecting sleeve and the thread and having ears extending outwardly through said slots, a revoluble frame, radial chasers carried thereby, and levers pivoted intermediately to the frame, at one end to said ears and at the other end engaging the chasers.

l0. In a die stock, the combination of a guide sleeve having a tapered thread, a protecting sleeve surrounding the guide sleeve, arcual nuts in the space between the thread and protecting sleeve, chasers, connecting mechanism between the same and said nuts, a collar surrounding the guide sleeve and adapted to hold the protecting sleeve rotatably thereon, and work-centering plungers extending radially through the collar and guide sleeve.

1l. The combination ot' a revoluble frame, radially mounted chasers therein having` side recesses providing shoulders, levers pivoted to the frame and bearing against said shoulders, a stationary member having a tapered thread, and riders on the thread connected with the levers respectively.

12. The combination of a die stock having radial guideways, chasers slidably mounted in said guideways and having cutting teeth at their inner ends, recesses in the sides of the chasers extending continuously to the outer ends, and members carried by the die stock extending into said recesses and bearing against the shoulders provided thereby, a stationary sleeve having a tapered thread, and riders on the thread connected with said members.

13. The combination of a revoluble frame, radially mounted Chasers therein having shoulders, levers pivoted to the frame and bearing against said shoulders, mechanism for swinging the levers to allow radial movement of the chasers, and spring detents carried by the ends of the levers and bearing against the chasers to prevent their dropping out.

14C. In a die stock, the Combination with a revoluble frame having housings the opening of which is rectangular in cross section, of Chasers rectangular in cross section movably mounted therein and each formed With a recess in one of its sides Which is parallel with the planes of revolution, said recess extending continuously to the outer end of the Chaser, levers carried by the revoluble frame and entering the recesses and adapted to bear against shoulders provided by the recesses, a stationary member having a tapered thread, and riders on the thread connected with the levers respectively.

l5. The combination, With a die stock having a chaser and mechanism for revolving it, of mechanism for controlling the distance of the Chaser from the axis including a stationary sleeve and radial plungers ex* tending through the sleeve and serving they double purpose of clamping the die stock to the pipe being threade and holding a part of said die stock on the exterior of the sleeve.

16. The combination, With a thread-cut ting Chaser, of a frame for revolving it, a stationary sleeve adapted tov be clamped about the pipe being threaded, mechanism Controlling the recedence of the Chaser and connecting said sleeve with said revoluble frame and including a device rotatively mounted on said stationary sleeve, a ring mounted on said stationary sleeve and adapted to position said device, and a centering plunger extending through the ring and stationary sleeve and adaptedto engage the pipe being threaded.

17. The combination, with a thread-Cutting Chaser, of a frame for revolving it, a stationary sleeve adapted to be clamped about the pipe being threaded,- mechanism controlling the recedence of the Chaser connecting said sleeve with said revoluble frame, a protecting sleeve rotatively mounted on said stationary sleeve, a ring mounted on said stationary sleeve and adapted to -position the protecting sleeve, centering plungers extending radially through the ring and stationary sleeve and adapted to engage the pipe being threaded, and spring-pressed detents for holding said centering plungers in various positions.

In testimony whereof, I hereunto aiiix my signature.

IRA vv. NoNNEMAN.

copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. G.

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