US2598423A - Nipple chuck - Google Patents

Description

May 27, 1952 R. B. PEALER NIPPLE CHUCK4 Filed Nov. 24, 1950 M RR y) rw y, r J 1 FYU Patented May 27, 1952 UNITED STATES @PATENT Iofi-"iu"ci:

Robert B. 'Fealerg VGarrettsvilie, Ghio, assigner to Beaver Pipev Tools, Inc., Warren, Ohio, Ia corporation of Ohio appunti-n November 24, 195o, serial No. 197,468

(o1. zie-'7) 4 Ciaims. 1

rlhis invention is concerned with a device adapted to be mounted in an ordinary chuck and carry a short partially threaded nipple, to enable the remaining thread to be readily cut on the nipple. The device comprises a barrel adapted to be mounted in the chuck and adapted to carry any onel of a number of bushings with yinternal threaded openings of different diameters to ree oeive Ydiiierelit size nipples.

Back of the opening through the bushing is an abutment against which the nipple blank threadi ed in the bushing turns by the force of the threading operation, which results in the nipple being tightly jammed in the device. To enable the nipple to be then readily removed at the end of the threading cut, I provide means for releasing the abutment in the barrel so that it may play back slightly away from the nipple and relieve the end thrust thereon.

My invention includes a device having thecharacteristics mentioned, and also the more particular embodiment thereof illustrated in the accompanying drawing and hereinafter described in detail.

1n the drawing, Fig. 1 is a side elevation of my nipple chuck; Fig. 2 is an end view thereof; Fig. 3 is a longitudinal section showing the partially threaded nipple inserted ready for action, the plane of this section being indicated by the line 33 on Fig. 1; Fig. 4 is a cross section on the device in the offset planes indicated by the lines #-4 on Fig. 1; Fig. 5 is a longitudinal section through the barrel and nipple showing the internal parts in elevation and indicating in broken lines the nished nipple; Fig. 6 is a fragmentary longitudinal section illustrating the mounting of a nipple of the maximum size in place of one of the bushings; Fig. 7 is a diagram illustrating the interchangeable bushings which may be mounted in the nipple chuck barrel.

In Figs. 1 to 6, l0 indicates the barrel of my device having a substantially cylindrical portion II adapted to be mounted in an ordinary chuck and if desired provided with flattened portions shownat I2 in Fig. 1, to enable it to be more firma ly gripped. Near its other end. this barrel is enlarged to form a head I3 having ah internal thread about a recess I of greater internal di ameter than the bore I6 oi the chucking portion of the barrel.

Mounted within thebar'rel recess I5 is the abutment 20. This is a round block having rabbets on each side of its intermediate cylindrical portion 2| which has a sliding t in the head I`3'. The reduced'front portion 22 is spaced from the thread 2 in the head I3, the reduced rear lportieri 23u h'asia sliding t in the barrel bore I6. This portion f23 of the abutment block has an vannular groove 24 in which seats the end of a pin 25 threaded 'into the wall of the head I3. The end of this Iplfan is of le'ss diameter than the width of thegroove `25 so that the abutment block .is capable of a limiting play longitudinally.

Back of the abutment block is a cylindrical holding block 38 which has an easy running nt inthe bore I6. Extending diametri'cally thrj'u'gh this holding block is a radial rod 3I which exe tends through inclined slots IB in the Wall o`f the barrel. The result of 'this is that when the rod 3l is turned relative to the barrel it is caxriihed longitudinally by the inclined wall of the slots and thus may carry the holding block away from the vabutment block. As shown, the rod ls clamped in the holding block by a Set Screw 32.

A suitable spring acts on the holding block and rod 3| to tend to keep the ro'd in its mos't ade vanced position, that is 'at that end f the slots I8 which isY nearest the abutment block. `As sho'wn this spring comprises a coiled spring 40 mounted on the screw 32 threaded in the holding block.' one end of the spring being secured to the holding block and the other 'to the barrel.

As heretofore stated, the barrelk may carry 'any one of a number of bushings having 'different `in`' termal threads. one of such bushings shown at 5D in various views, and a set of then is ilidicated at sua, sub and 5cc in the diagram, Fia i. Each bushing has an internally threaded p'- tion 5 I and externally threaded reduced extension 52.

The external threads on the extensions all of the bushings are of the saine diameter fd thus any bushing is adapted to 'screw into the head I3 with its extension occupying the sia'e between the internal thread in the head and the exterior of lthe abutment portion 22. Beyond 'the outer side of the extensin'52 the bushing isf considerably greater size to pvide piief strength and it has flats at itsV edge t''yer'alle the application of a wrench. The internal threads in each of the bushings, as' well as the int'ehal thread vin the head I3, is of standard SiaeV f Various pipes.

It will be noticed that the internal th of the bushings 5U and head I3 are each of ihaterially less' axial length than the' tapered thread on the partially formed nipple. K'li' threads engage the nipple blank freely n'gh to enable such blank to be readily turned ihto 'plac by the operators hand until the blank engages spring 40.

the abutment 20. Thereafter the axial thrusts on the blank due to its rotation under cutting pressure is always taken by the abutment, which is now immovably held in the barrel. When the nipple is thus turned in far enough to impinge heavily against this block it results that the outer surface of its threads bear tightly against the outer surface of the bushing threads and thus the nipple is locked tightly in position.

As the threading progresses, the nipple blank may turn by the threading action, thus screwed more tightly into the bushing 50 and against the abutment block which is held in its forward portion by the holding block and rod 3| under the action of the spring 40.

After the threading has been completed and it is desired to release the nished nipple (shown in broken lines A' in Fig. 5) it is only necessary for the operator to grasp the projecting ends of the rod 3| and turn it against the action of the In this movement the rod passes to the other end of the slots, as indicated by the broken lines in Figs. 2 and 4. This cams the holding block backwardly and releases the abutment block 20, which is thus free to play back the slight distance allowed by the holding block and the inner end of the pin 25. This release of the abutment block allows the finished nipple .to bereadily unscrewed manually out of the device.

When the largest size of nipple is to be threaded no bushing is employed but the nipple blank itself is mounted in the internal threads ordinarily occupied by a bushing. This is illustrated in Fig. 5, where such large size nipple is shown in longitudinal section at A2. In this case, the inner end of the nipple when fully mounted in the head I3 abuts directly against the enlarged portion 2| of the abutment 20.

It will be noticed from Figs. 3, 5 and 6 of the drawing that the rear end of the abutment block 2U is crowned, thus causing the holding block 30 to have almost a point bearing against the abutment block, preventing undue friction in the operation of the holding block. It will also be seen that the front faces of the portions 22 and 2| of the abutment block are slightly beveled. This causes any nipple which engages these faces to bear against it merely at the inner circular edge of the nipple, preventing any undue binding in these regions and eliminating the possibility of the pressure on the end of the nipple damaging the final turn of its thread.

It will be seen from the disclosure in the drawings and the above description that my nipple chuck is of very simple construction and is adapted for ready mounting in the chuck of any pipe working machine or other power device whereby it may be rotated.

It stands at all times ready to receive one size ofgppple blank, and may be readily changed for another size desired merely by substituting any of the other bushings of the set, as the internal abutment and operating mechanism are equally well adapted for all sizes of pipe. The release of such abutment is easily effected manually by the projecting operating rod which would stand in front of the chuck in which the barrel is mounted.

, I claim:

1. In aV nipple chuck, the combination of a hollow barrel having a bore having a head with an internally threaded recess of greater diameter than the bore, an abutment block mounted in the barrel having an enlarged cylindrical portion intermediately located and having a cylindrical portion of less diameter on opposite sides of the enlarged portion, a bushing having an internal thread and having an extension with an external thread, said extension occupying the space between the outer one of the reduced portions of the block and the threaded interior of the head, a radial pin carried by the head and having its inner end loosely occupying a recess in the inner reduced portion of the block, a cylindrical block rotatably mounted in the bore of the barrel back of the abutment block, a rod passing diametrically through said cylindrical block and through inclined slots in the wall of the barrel, and a spring within the barrel connected one end to the barrel and at the other end to the cylindrical block and tending to maintain the rod at the front end of the slots through the barrel.

2. In a nipple chuck, the combination of a hollow barrel carrying an internal thread at the forward end thereof to receive a partially threaded nipple blank. a nipple abutment block mounted within the barrel for axial movement relative thereto, means carried by the barrel for holding the block therein with a limited axial movement, a cylindrical block within the bore of the barrel behind the iirst block and providing an abutment, therefor, a rod extending diametrically through the cylindrical block and passing outwardly of the nipple chuck through inclined slots in the wall of the barrel, the inclination of the slots being such as to prevent rearward axial movement of the cylindrical block consequent upon the exertion of axial pressure thereon by the nipple through the medium of the abutment block and a spring tending to keep the rod in the forward position of the slots whereby the rod may be manually moved in the slots in opposition to the spring to cam the cylindrical block backwardly to relieve pressure between the blocks and between the abutment block and the nipple.

3. In a nipple chuck, the combination of a hollow barrel having an axially extending bore, said barrel having an internal thread at one end thereof to receive a partially threaded nipple blank, a block mounted within the barrel for rotary and axial movements relative thereto and providing an abutment for the inner end of a nipple, resilient means mounted within the barrel and having a connection operative on the block and normally acting to urge the block axially toward the threaded end of the barrel, means including said connection to prevent axial inward movement of the block by forces tending to move the nipple inward, and manually operable means to move Ysaid connection inwardly against the action of the spring and free the block for inward movement, whereby any pressure between the block and a nipple will be released to permit withdrawal of the nipple from the barrel.

4. In a nipple chuck, a barrel having an axially extending bore and an internal thread at its forward end thereof to receive a partially threaded nipple blank, an abutment block mounted in said bore for both axial and rotary movements relative to the barrel, said block having crowned forwardly facing surface adapted to abut a nipple positioned in said threads and a second surface facing the rear of the barrel, means to limit the axial movement of the block in either direction to a predetermined distance, a second block mounted within said bore for axial and rotative movement relative thereto and having a forwardly facing surface to engage the second surface of the abutment block, one of said lastnamed surfaces being crowned, said barrel having a pair of inclined slots, means carried by the second block and coacting with the slots to cause 6 REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 500,748 Smith July 4, 1893 513,147 Riley Jan. 23, 1894 515,826 Gibney Mar. 6, 1894 523,722 lHall et al July 31. 1894 851,137 Manley Apr. 23, 1907 931,327 Manzel Aug. 17, 1909 947,713 Johnson Jan. 25, 1910

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