US1422222A - Diestock - Google Patents

Description

I. w. NONNEMAN/ DIESTOCK. APPLICATION HLED JUNE 25. 1920.

Patented July 11, 1922.

2 SHEETS-SHEET I.

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BY 4 ZBWWM,

ATTORNEYS l. W. NONNEMAN.

DIESTOCK. APPLICATION FILED JUNE 25, 1920.

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

WARREN, OHIO, A CORPORATION OF OHIO.

DIESTOCK.

Specification of Letters Patent.

Patented July 1 1, 1922.

Application filed June 25, 1920. Serial No. 391,716.

To all whom it may concern: Be it known that I, IRA W. NONNEMAN, a citizen of the United States, residing at Warren, in the county of Trumbull and State of Ohio, have invented a certain new and useful Improvement in Diestocks, of

I which the fOllOWiHg' is a full, clear, and

exact description, reference being had to the accompanying drawings. 7

This invention relates to die stocks and is particularly concerned with that type having a plurality of sets of chasers so mounted that threads of different pitches may be cut on pipes or similar articles of different diameters without removal or replacement of the chasers.

An object of this invention is to provide a simple and effective means for moving one set of chasers, having a given pitch, into an active position, and at the same time to move another set of chasers, having a different-pitch, into inactive position. Another object is to provide for positively locking the chasers in any selected position.

My invention will be hereinafter more fully described in connection with the drawings and the essential characteristics are set forth in the claims.

In the drawings Fig. 1 is a face or front viewof the die stock; Fig. 2 is the same as Fig. 1 with the front plates removed showing the pivoted connection between the chasers; Fig. 3 is an axial section through the die stock; Fig. 4 is a section through the cam plate taken on the line 44L in Fig. 5; Fig. 5 is a plan of the cam plate; Fig. 6 is a perspective of one of the Chasers; Fig. 7 is a detail showing the connection of a rocking lever with one of the chasers.

Designating the-parts with the use ofreference characters in Fig. 3, 10 represents the frame of the die stock, which has axially aligned inner sleeves 11 and 12. The web 13 extends outwardly from the junction of the inner sleeves,,and carries, in addition to the flanges 14 and 15,-diametrically opposite sockets 16 and 17, which are internally threaded to receive stock handles 40 and 41.

Slidably mounted within the frame 10 are one set of chasers 18 and another set of chasers 19. These chasers are positioned on the forward end of the frame and may extend through notchesin the flanges 12 and 15; the-notches having a width substantially equal to the thickness of two of the chasers,

and a depth substantially equal to the width of one of the chasers.

A cam plate 25 rotatably positioned on the sleeve 12 fits against the flange 15. This cam plate is substantially a ring disk having connected arcuate cam grooves cut on the inner face. These grooves as shown in Fig. 5 comprise chaser moving or active grooves 45, for adjustment, and rest grooves 46, connected by transfer grooves 17 which serve to reverse the positions of chasers. The depth of the grooves may be substantially equal to half the thickness of the cam plate, it being only necessary to provide depth suflicient to give good hearing to the pins 20 which move therein. A tongue 27 protrudes from the cam plate 25 and serves to provide means by which the operator can rotate the cam plate. 7 i

As shown in Fig. 2 a rocking lever 30 pivoted on a rock shaft or pin 31 may be bent inwardly at each end and slidably secured at one end to one of the chasers in the set 18, the other end being slidably secured to a chaser of the set 19. The rocking lever may comprise a strip of wire bent to form a loop at its middle portion throu h which the pin 31 may be inserted, while the outer end may be bent towards the axis of the die stock to permit the ends to engage notches 22 in the chasers.

The pins 31 together with the rocking levers 30 are secured to the frame 10, in the annular portion 23. In this location any movement of the rocking lever will not interfere with any movement of the cam plate 25. To secure the cam plate, after the proper adjustment has been made, by rotating it to the desired position, I may provide a clamping nut 28which has an internal thread adapted to engage a threaded portion of the sleeve 12.

As a convenient means for guiding the die stock when a thread is being cut on a pipe or other article, I provide guide jaws 35 slidably mounted in notches with flanges 11 and 14:, and provide a cam plate36 which upon rotation will move the guide bars in wardly 0r outwardly. I may also provide a lock nut 37 to clamp the cam plate 36 when the proper adjustment of the slide jaws 35 has been effected.

In operation, the stock frame is inserts over theend of the pipe or other article to be threaded, the slide jaws adjusted to the outside diameter of the pipe andlocked in this position. The chasers having the posi tion desiredon the forward end of the die are then moved either inwardly or outwardly by rotation of the cam plate 25. The movement of the chasers is caused by the pin 20 moving in the curved grooves l5 and L6. The pins 20 of the chasers which are in use will occupy the cam grooves i5 and their location in the grooves will be determined by the size of the work being operated on. The chasers which are inoperative will have their pins 20 in the rest groove 46. hen a chaser moves from an active to a rest position, the pin moves along the slot and (as best seen in Fig. 5) toward the center of the cam plate until it reaches the outwardly curved portion of the cam whereupon it moves away from the center and towards the rest groove.

The neutral point where the rest and active grooves merge is indicated at 4?, and as the pins 20 pass these neutral points the members 30, operated by the pins in the othergrooves, will cause the first mentioned pins to properly enter the rest slot 46 so that there can be no jamming action, due to the tendency of the pins to enter the next active groove 45 instead of the rest groove 46. The lever members 30 being made of wire are somewhat resilient or yielding in their action and this causes the pins to enter their ple, durable and capable of being cheaply manufactured;

Having thus described my invention, what I claim is 1. In a die stock, the combination with a.

proper grooves, even although the latter are I worn or somewhatinaccurate. After they have been moved so that they will conform to the size of the pipe to be threaded, then the lock nut 28 is drawn up thus clamping the cam plate against the'flange 15 of the frame. During the cutting operation the ehasers 0f the active setare positively locked against outward movement by the walls of the grooves 45, bearing against the pins 20.

To effect an inward or outward movement of the chasers, it is necessary to slacken the nut 28 and to rotate the cam plate 25. The grooves in the cam plate are so designed that 'an inward movement of the set of ehasers 19- eitects an outward movement of the chasers in the set 18, as soon as the pins in the chaser enter the transfer grooves 47. The rocking levers which connect the adj a cent chasers serve to effect a positive move ment of one of the chasers with relation to the adjacent one, and at the same time to prevent any binding action which may occur between the pin and the walls oi the groove in the cam plate.

It will thus be seen that I have provided a die stock capable of carrying chasers having'ditterent positions and, at the same time that I have provided means for moving one set ot-chasers relative to the other set. My invention possesses the advantage of positively locking the chasers in any selected position. Further it provides a die stock which is simetlects a relative movement of the chaser carrying frame, a plurality of sets otradially movable chasers,- a cam for simultaneously actuating all sets of chasers, and lever connections extending from a chaser of one set to a chaser of another set.

2. In a die stock, the combination with a chaser carrying trams, a plurality of sets of radially movable chasers, means for actuating either set of chasers relative to the other, and lever connections each extending from a chaser of one set to a chaser of an other set.

In a die stock, the combination of a chaser carrier, a cam plate having two sets of cam grooves therein and rotatably mounted on the carrier, a plurality of sets of chasers movable in said carrier, one set of cams being adapted to move one set of chasers into active position, while the other set ism-oving the otherset of chasers into an inactive position, and lever connections between one set of chasers and another.

4. A cam plate for use in a die stock, comprising a ring disc having connected arcuate grooves therein, said-grooves comprising a continuous substantially circular outer rest groove and a set of inner connected arcuate active grooves, said inner grooves having -a plurality of points common with the outer groove.

5. In a die stock, the combination of a chaser carrier, a cam plate rotatably mounted thereon, a plurality of sets of chasers movable in said carrier, said cam plate having active, rest, and intersecting transfer grooves, means connecting the chasers with the said cam whereby movement of the cam said chasers.

6. In a die stock, the combination of a chaser carrying frame, two setsof chasers radially movable in said frame and arranged in pairs comprising a chaser of each set, a cam plate having endless cams adapted to coact with said chasers and to cause relative movement of one set of chasers with another set of chasers, aivoted connections between chasers of one set and those of the other set.

"7. In a die stock, the combination with a chaser carrying frame of a plurality of chasers arranged in sets, a cam'plate having grooves therein, a lever pivoted. at the cen ter, and connecting at its ends a chaser of one set with a chaser of another set, means on said chaser adapted to engage the grooves in said cam plate, one of said grooves being annular and another of said grooves com prising a series of connected arcuate grooves.

8. In a die stock, the combination with a chaser carrying frame of a plurality of chasers arranged in sets, a lever pivotally mounted within said frame and connecting a chaser of one set with a chaser of another set, a cam plate having grooves therein comprising active, rest, and transfer grooves, and means on said chasers for engaging the said, grooves.

9. In a die stock, the combination with a chaser carrying frame of two sets of chasers arranged in pairs,'each pair comprising a chaser of each set, a lever intermediately pivoted and having its ends secured to one chaser of each set, whereby movement of a chaser in one set causes a relative movement of a chaser in another set.

10. In a die stock, the combination with a frame, of a cam plate mounted thereon and having grooves therein, chasers mounted in said frame, projecting members on said chasers for engaging the grooves in said cam plate, said grooves comprising a set of active grooves and a set of rest grooves, one

' of said sets surrounding the other, and the two sets being connected at spaced points by transfer grooves.

11. In a die stock, the combination with a frame, of a cam plate, having active, rest, and transfer grooves therein and rotatably mounted in the frame, means on the chasers adapted to engage the said grooves, means pivotally mounted on the frame and engaging a pair of adjacent chasers, to shift the chasers from one type of groove to another.

12. In a die stock, the combination with frame, a plurality of sets of chasers, a cam plate having rest, active and transfer grooves, said rest andactive grooves occupying the same circumferential space through a portion of their extent and being connected by said transfer grooves, means on the chasers for en 'a in the said 'rooves b b b 1:

whereby relative movement is obtained be tween the adjacent members of said sets of chasers, and means connecting a chaser of one set with a chaser of another set.

13. In a die stock, the combinationwith a frame of a cam plate having grooves therein and rotatably mounted in the frame, means on the chasers adapted to engage the said grooves, a lever pivotally mounted on the frame and engaging a pair of adjacent chasers.

14. In a die stock, the combination with a frame, a plurality of sets of chasers, a cam plate having rest'and active grooves, said active grooves being spaced radially inwardly of said rest, grooves, and transfer grooves constituting a connection between the other grooves.

15. In a die stock, a chaser carrying frame, sets of chasers arranged together in pairs and adapted to be moved toward and from the work, a cam groove, means adapted to enter the cam groove to move the chasers, and a pivoted lever connecting the adjoining chasers in pairs.

16. In a die stock, the combination of a chaser carrier, a cam plate rotatably mount- I means coacting with said cam groove, whereby as one chaser of each pair moves towards the work the other moves away, and a yielding lever connecting the adjacent chasers of different sets, whereby during operation said lever will give to prevent any jamming action between the chasermoving means and the cam groove.

18. In a die stock, a chaser carrying frame, two sets of chasers arranged together in pairs and adapted to be moved toward and from the work, a cam groove, means on said chasers adapted to coact with said cam groove to move the chasers toward and from the work, a wire rod connecting the adjacent chasers of different sets and acting to prevent any binding action which might occur between the cam groove'and the chaser moving means which coact with the groove.

19, In a die stock, the combination with a frame of two sets of chasers, a cam plate rotatably mounted thereon, said cam plates having sets of active and rest grooves, pro jecting members on one set of chasers for engaging an active groove and projecting members on the other set of chasers for engaging the rest grooves, and a lever having its ends slidably mounted in a chaser of each set, whereby the chasers of one set are moved to an active groove when the chasers of the other set are moved to the rest groove.

In testimony whereof, I hereunto afiix my signature.

IRA W. NONNEMAN.

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