US1307141A - nonneman - Google Patents

Description

I. W. NONNEMAN.

, DIE STOCK. I APPUCATION LFD JUNE 21]. I917. 1,3Q'7,1%1. Patented June 17, 1919.

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I. W. NONNEMANr m5 STOCK. APPLICATION FILED JUNE 28 I917.

1 ,307, 14:]. Patented June 17, 1919.

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

DIE-STO GK.

' Specification of Letters Patent.

Patented June 1'7, 191%).

Application filed June 28, 1917. Serial No. 177,435.

citizen of the United States, residing at, lVarren, in the county of Trumbull and State of Ohio, have invented a certain new and useful Improvementin Die-Stocks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to a die stock of the type wherein the chasers recede to enable the eflicient cutting of a tapered thread on a pipe or other article. The objectof the invention is to render the die stock very compact and simple in construction, while effectively performing the operation desired. The die stock is illustrated in the drawings hereof and is hereinafter more fully explained.

In the drawings, Figure 1 is a front elevation of the die stock; Fig. 2 is a side elevation thereof in position on a pipe; being.

threaded; Fig. 3 is an axial section of the die stock with the pipe in place and with the chasers just starting to cut; Fig. t is a portion of an axial section with the chasers justfinishing the cut; Fig. 5 is a perspective view of a chaser and the cooperating tapered blocli and shifting device therefor which controls the recession; Fig. 6 is a cross section through the rotatable frame at one of the chaser housings, as indicated by the line 66 on Fig. 1. p

In the drawings, A indicates a pipe to be threaded and a the thread formed or being formed thereon.

One member of the die stock comprises a sleeve 10 surrounding the pipe and stationarily clamped to it by suitable radial thumb screwsll. Another member of the die stock comprises a rotatable frame 20 formed with by tapered pins carried by a ring rotatably undercut ribs 21 to provide radial housings.

for the chasers 30, and also having sockets 22 into which extend the removable operat ing handles 40. This member 20 has an externally threaded sleeve portion 24 which ex tends within and engages internal threads 12 on an extension 13 of the sleeve 10. The thread described is of the pitch which it is desired to cut on thepipe, and the effect is to cause the chasers to travel longitudinally of the pipe atthe desired rate as the chaser frame is rotated.

To cause the chasers to recede as they travel along the pipe, I provide movable tapered abutments limiting their outermost position. 50 indicates these abutments,

which are suitable blocks mounted in openings 25 in the chaser frame opposite the outer end of each chaser. The outer wall of each opening is beveled, as shown at 26, and the abutments are correspondingly. beveled on their outer edges and bear at their inner edges against the outer ends of the chasers. The inner edges of these abutment blocks are parallel with the axis of the die stock.

- To shift the tapered blocks 50, to allow the chasers to recede, I provide housings for the blocks in the form of slotted barrels which occupy cylindrically formed openings in the chaser frame and have at their ends reduced extensions 61-. These extensions pass through and are riveted to the flange 70 of a ring '71, which is internally threaded and screws onto an external thread 14 on the extension 13 of the stationary sleeve. The thread 14 is of much steeper pit-ch than the thread 12, so that, as the chaser frame in its rotation travels along the pipe, due to the thread 12, the ring 71 will be given a greater movement lengthwise of the pipe. This causes a relative recedence of the flange 70 from the chaser frame and draws out the barrels 60 and the taper blocks 50, thus relieving the outer ends of the chasers so that they may gradually move outwardly.

Fig. 3 indicates the innermost position of the chasers, at the start of the cutting operation, and Fig. 4 indicates the finishing position, where the ring 71 has moved relatively away from the chaser frame, and thus the withdrawn blocks 50 have allowed the chasers to move outwardly.

Heretofore the control of the recedence of the chasers has frequently been effected Figs. 3 and 4E. The taper of the blocks 50 is made correspondingly steep so that the proper recedence of the chaser is effected by this comparatively small longitudinal travel.

The result of a new construction is that the housings for the taper blocks at no time project to any material extent beyond the chaser frame, as shown in Fig. 3. The slight relative longitudinal movement re quired of the abutments enables the device to be extremely compact, occupy little space and avoid the troublesome projecting tapered pins heretofore employed.

Having thus described my invention, what I claim is:

1. In a die stock, the combination of a rotary chaser-carrying frame, movable abutments for the chasers, each having a hearing on one side against the chaser and on the other against the chaser-carrying frame, a stationary member adapted to be clamped to the work, and a differentially threaded engagement between said stationary member and the chaser carrying frame on the one hand and between the stationary member and the abutments on the other hand.

2. In a die stock, the combination of a rotatable chaser-carrying frame, a stationary member to which it is threaded, a member rotatable with the chaser-carrying frame and automatically movable along the stationary member at a different rate from the chaser-carrying frame, chasers, abutments therefor each having two edges at an angle to each other, one of said edges coacting with a chaser and the other with the chasercarrying frame, and means whereby the relative movement of said member to the chaser-carrying frame causes movement ofsaid abutments to control the recedence of the chasers.

3. In a die stock, the combination of a frame adapted to be clamped stationarily to a pipe to be threaded, a rotary chaser-carrying frame having a threaded engagement with the stationary frame, a membe having a different threaded engagement with the stationary frame, and devices having an inclined engagement with the chaser-carrying frame and connected with said member for controlling the recedence of the chasers, said devices engaging the chasers on planes parallel with the axis of the die stock.

4. In a die stock, the combination of a sleeve, means for clamping it to a pipe to be threaded, a rotary chaser-carrying f 'ame having a threaded engagement with said sleeve, a ring having a. threaded engage ment with the sleeve from the engagement with the chaser frame, and blocks movable radially and longitudinally and having outer inclined edges guiding. the blocks and inner edgeswhich engage the ehasers and are at an angle to the outer edges, and recesses controlled by the relative ntr led rth travel of the chaser frame and said ring for shifting said blocks to control the recedence of the chasers.

5. In a die stock, the combination of a frame adapted to be clamped to a pipe to be threaded and having an internally threaded sleeve portion, a chaser-carrying frame having an externally threaded sleeve portion engaging the internal threads mentioned, an internally threaded ring engaging the external threads on the clamped frame which are different from the internal threads, tapered members individually movable in the chaser frame and forming abutments for the chasers, and means connecting the same with said ring.

6. In a die stock, the combination of a sleeve adapted to be clamped to the pipe to be threaded and provided with an internal thread, a chaser carrying frame having an externally threaded sleeve engaging the threads first mentioned, a ring internally threaded and engaging external threads on the stationary sleeve, said threads being of a different pitch from the internal threads, chasers mounted in the chaser frame, abutment blocks mounted for radial movement in the chaser frame and means shifted by the movement of said ring relative to the chaser-carrying frame for moving said block and thereby controlling the recedence of the chasers.

7. In a die stock, the combination of a stationary sleeve adapted to be clamped to the pipe to be threaded and provided with an internal thread, a chaser-carrying frame having an externally threaded sleeve engaging the threads first mentioned, a ring internally threaded and engaging external threads on the stationary sleeve, said threads being of a different pitch from the internal threads, chasers mounted in the chaser frame, movable tapered abutment blocks for the chasers occupying openings in the chaser frame, and housings for the abutment blocks connected with said ring. v

8. In a die stock, the combination of a rotary chaser-carrying frame having chaser housings, radial chasers mounted in said housings, a sleeve 011 said chaser frame externally threaded, a sleeve adapted'to be clamped stationarily to the work and internally threaded and engaging the sleeve on the chaser frame, said stationary sleeve having external threads of different pitch from the internal threads, an internally threaded ring engaging the external threads on the stationary sleeve, said ring being provided at a dlfi'erent pitch with a flange adjacent to the chaser frame, and longitudinally movable tapered abutments mounted in recesses in the chaserearrying frame and bearing, against said frame and connected with; sald flange and ment of said ring and chaser frame.

relatively different move;

9. In a die stock, the combination of a rotary chaser-carrying frame having chaser housings, chasers mounted in said housings, a sleeve on said chaser frame externally threaded, a stationary sleeve adapted to be clamped to the work and internally threaded and engaging the sleeve on the chaser frame, said stationary sleeve having external threads of different pitch from the internal threads, an internally threaded ring engaging the external threads on the'stationary sleeve, said ring being provided with a flange adjacent to the chaser frame, tapered blocks mounted in openings in the chaser frame and seating against beveled walls in such frame, said blocks forming abutments for the chasers, and members slidably engaging said blocks and connected wit-h said ring.

10. In a die stock, the combination of a rotary frame, chasers slidably mounted therein and having tapered cutting teeth at their inner ends, recesses in the frame opposite the outer ends of the chasers, blocks mounted in the recesses and having beveled outer edges engaging beveled walls of the recesses, slotted barrels embracing said blocks and slidably occupying recesses in the chaser frame, and means for moving said barrels relative to the chaser frame as the threading progresses.

11. In a die stock, the combination of a rotary frame having radial housings, chasers slidably mounted in said housings and having tapered cutting teeth at their inner ends, recesses in the frame opposite the outer ends of the chasers, blocks mounted in the recesses and having beveled outer edges engaging beveled walls of the recesses, slotted barrels embracing said blocks and slidably occupying recesses in the chaser frame, a ring to which said barrels are connected, a sleeve on the chaser frame extending within the ring, external threads on such sleeve and internal threads on the ring of different pitch, and a stationary member adapted to be clamped to the work to be threaded and having an extension projecting between the sleeve and ring and internally threaded to engage the sleeve and externally threaded to engage the ring.

12. In a die stock, the combination of a chaser-carrying frame, chasers mounted therein, individual tapered abutment blocks between the respective chasers and the chasercarrying frame, and mechanism movable longitudinally of the die stock as the chaser-carrying frame rotates, said mechanism having an operative engagement with the said tapered blocks which allows them to travel radially as they are moved longitudinally.

13. In a die stock, the combination of a chaser-carrying frame, chasers mounted therein, individual abutment blocks for the respective chasers having on their outer edges a beveled engagement with the chasercarrying frame and on their inner edges an engagement parallel with the die-stock axis with the chasers, and mechanism movable longitudinally of the die stock as the chaser-carrying frame rotates, said mechanism having an operative engagement with thesaid abutment blocks which allows them to travel radially as they are moved longi tudinally.

In testimony whereof I hereunto atiix my signature.

IRA W. NONNEMAN.

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

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