US965402A - Threading-machine. - Google Patents

Description

` v v H. W. GSTER.

THRBADING MAGHINB.

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THREADING MACHINE.

APPLIOATION P ILED JUNE 1, 190s.

H. W. OSTER.

THBEADING MACHINE. ,K APPLIOATIQN FILED JUNE 1, 1eme.

Patented July 26, 1910.

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seance.

HERMAN W.

OSTER, OF CLEVELAND, OHIO, ASSIGNOR TO THE OSTER MANUFACTURING COMPANY, OF CLEVELAND, OHIO, l.A CORPORATION OF OHIO.

THREADING-MACHINE.

Specication of Letters Patent. Patented July 26, figli).

Application led June 1, 1908. Serial No. 436,078.

To all whom it may concern:

Be it known that I, HERMAN W. OSTER, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Threading-Machines, of which the following is a full, clear, and exact description.

This invention pertains to devices for cutting tapered threads upon cylindrical pipes and bars. It is speciically an improvement 'upon the type of thread cutting devices which form the subject matter of my prior application No.'417,806, filed February 26, 1908.

The primary object of this invention is, however, to provide means by which, after a thread has been cut upon the work, the dies may be withdrawn from engagement therewith, and so permit the work to be removed from lthe device without having to turn the die-carrying part of the device backward.

Another object of the invention is to provide' efficient means for securingthe work to be threaded centrally within the device.

In the drawing, Figure 1 is an end view of a thread cutting device embodying the l invention. Fig. 2 is a side elevation thereof broken away at onepoint and there shown in section. Fig. 3 is a side elevation largely in section showing the position of the parts when the cutting of a thread is commenced. Fig. 4 is a sectional view of the lead ring; Fig. 5 is a side elevationof that ring; and Fig. (3 is a view similar to Fig. 3, but showing the position of the parts ater the threads have been cut and the dies withdrawn from engagement with the work.

Referring to the parts by letters, A represents the tubular work holder which is preferably made of two parts, a, a', rigidly fixed one upon the other. Upon the art a is an annular iange 1,2 between whic and the end of the part a' an annular groove is formed in which the ring E is rotatably mounted, but is held against endwise'movement.

B represents the tubular die carrier which has a long cylindrical portion b which is rotatably mounted in the member' A. rlhe dies C are movable radially in guide ways in the end or the member B. A cam plate D is rotatably mounted upon lthe member B,

land is held thereon by a flanged ring F which screws into the end of the member B. This cam plate has the usual cam ribs d on its inner face which engage in notches in the dies 1n the usual way, whereby, as this cam plate is turned, the dies are simultaneously and equall moved in or outin their guide ways. Thls cam plate is provided with an outwardly extended portion d having init a hole cl2.

An arm G is fixed in an arcual slot e to the ring E, and extends therefrom toward the end of the device at an inclination to the axis of said ring,a`sshown. This arm passes through the hole d2 inthe overhanging part of thecam plate, and a cylindrical nut g which loosely lits this hole is screwed onto this bar. Pins H secured to the ring E, are parallel with the axis of the device, and pass loosely through holes in the member B.

A ring K Vis fixed to the member B lying in a recess between said member and the part a of the member A. In the periphery of this ring is a groove Ic, cut spirally with the same pitch as the pitch of the threads on the dies C. A radially extended spring actuated plunger M is mounted in the member A, and is adapted to be moved radially inwardby its spring m, into the groove is.

In the member A, near the end thereof are three, more or less, radially moving clamping bars N having spiral grooves n in their outer faces, which are engaged-by spiral ribs 1' on a cam plate R rotatably mounted upon the member A, and thereon held by a lock ring P. A set screw T screws longitudinally through each of the bars N, and the points of said screws, which may be adjusted by turning the screws one way or the other, engage with the work.

Now, lto use this device, the `cylindrical pipe or bar to be threaded is passed into the device from the right end thereof, where the parts are in the position shown in Fig. 3, until its end engages with the dies C. rlhe cam plate D has been turned .to properly set the dies; and the bar G has been adjusted in the slot e in the ring E, so that the cylindrical vnut G, by its engagement with the cani plate in the hole cl2 therein, will `hold the cam plate and consequently the dies in the proper position for beginning the cutting of the threads. When the parts are yplunger M upon the spiral groove c in the ring K. In other words, this ring KandA plunger M serve the purpose of a lead screw when the cutting of the thread is first begun. When, however, one revolution of member -B has been effected the plunger will come to the end of groove lc, which end is inclined outwardly, whereby the plunger is pushed out of the groove, and thereafter engages for a time with the outer surface4 of said ring, but it has no effect whatever in causing endwise movement ofthe member B. By this one revolution of member B, however, during which time said member B is being drawn inward, the dies have taken hold of the work, and thereafter will make their own lead as they cut the thread. The member B will therefore be gradually drawn into the member.A by the said action of the dies. The member B and the ring E will rotate in unison because of the pins H carried by the ring passing through holes in the member B. As member B is thus drawn inward, it carries the cam plate with it, and this cam plate will slide along the nut g and be gradually turned in the direction which moves the dies slowly outwardly, and thereby they will cut a tapered thread upon the work. When a thread of sufficient length has been cut the cam plate will generally have passed be ond the nut g into the plane of the body o fthe bar G, or at least onto the lower tapered end of said nut. When the cam plate is no longer engagin with the nut,-and perhaps when it 1s em racing the tapered end thereof, the.

cam platemay be turned so as to withdraw the dies from the work. This being done,

,the work may be withdrawn .from the device, and thereafter the member B, and cam plate may be moved endwise, without turn,- lng, so as to restore the parts to the position for again beginning to cut a thread. As member N and its ring K are moved outward in member A, the inclined face lc on ring K will engage the plunger M and push it outward and 'hold it out until the groove k comesinto the range of said plun er, whereupon the plunger will snap into tghis groove. As the parts ,move into this position the cam plate, by engagement with the taper ended nut 'g 'will be turned to the proper position to set the dies for 'beginning the cutting of a new thread. The enlarged part of the guide bar G is made in the form of an adjust-able nut, in order that the device may be adjusted to throw oil' the dies at any desired point.

In orderto prevent the chips produced by the dies from getting between the die carrier and work holder, and into the described lead devices, a cylindrical chip shield p is provided. It is secured to the work holder by means of a flange p which is clamped between the lowerend of the member a, and a shoulder a2 on 'the membera-and the shieldy fits the innersurface of the die carrier. I

Having thus described my invention, I claim:

1. In a threading machine, a work holder, a die carrier which is rotatable and movable lengthwise relative to said work holder', a die carried by'` said die holder, and a cam plate havingv an overhanging edge carried by and f adapted to turn uponV said die carrier and vto control the position of the die a ring rotatable upon the work holder but Aincapable of longitudinal movement thereon, means compelling this ring and die carrier to rotate 1n unison, an inclined arm secured to said ring and 'passing through a hole in the over-hanging edge of said cam plate, said arm being enlarged in that part which normally plays in the hole in said cam plate, said enlarged part having a tapered inner end.

f2. 'In a threading maemne, a work holder, a die carrier whichis rotatable and movable lengthwise relative to said work holder, a die carriedl by said die holder, and a cam plate having an overhanging edge carried y and adapted to turn upon said die carrier and to control the posltion of the die, a ring rotatable u on the work holder but incapable of longitudinal movement thereon, means compelling this ring and die carrier to rotate in unison, an inclined arm secured to said ring ang/passing through a hole in the over-,hanngfi g edge of` said cam late, said armbeingprovided with a cylin rical enlargement secured for longitudinal ad- 'ustment on said arm and adapted .to play 1n the hole in said cam plate.

3. In a thread cutter, the combination of a tubular work holder, a tubular die c arrier rotatably mounted upon rthe work holder and capable of longitudinal movement relative thereto,-the die carrier havin an external flange Within the work ho der, and said flange having in its periphery a spiral groove with an inclined terminal, and having also' a tapered end, with a movable device carried by the work holder and a spring for forcing the same inward whereby it wlll engage with the tapered end of said flange or with the periphery of the flan groove therein accordmgto the relative positions of the die carrier and work holder.

e or with the spiral- 4. 1n a thread cutter, a work holder comprising two concentric teiescoping arts, the` outer member having an inward y turned flange at one end, a tubular chip shield con- 5 centric with the work holder 4and having an outwardly extended fiange which' is clamped between the end of the inner member of the work holder and the inwardly turned flange on the outer member thereof, combined with 10 a die carrier having a tubular portion-which is rotatably mounted in the work holder, with its end embracing the cyiindrical portion of the chip shield. A

In testimony whereof, I hereunto affix my signature in the presence of two witnesses. 15

HERA N WQ USTER.

Witnesses:

E. JB. Gmcmrsr, H. R. SULLIVAN.

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