US808592A - Die-stock. - Google Patents

Description

PATENTED DEC. 26, 1905.

F. V. ANDERSON.

DIE STOCK.

2 sums sunn'r 1.

APPLICATION FILED AUG. 7.1905.

N Smawtoz flan/f M Andaman,

-- In J H v, (w f No. 808,592. PATENTED DEO.26,1905.

F. v. ANDERSON.

DIE STOCK.

APPLICATION FILED AUG. 7,1905.

2 SHEETS-SHEET 2.

UNITED STATES PATENT @FFIOE.

FRANK V. ANDERSON, OF OENTRALIA, ILLINOIS, ASSIGNOR OF ONE-HAL TO JAMES B. GRAGG, OF OENTRALIA, ILLINOIS.

DIE-STOCK.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed August '7, 1905. Serial No. 278,123.

To all whom it nmq concern:

Be it known that I, FRANK V. ANDERSON, a citizen of the United States, residing at Oentralia, in the county of Marion and State of Illinois, have invented certain new and useful Improvements in Die-Stocks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the' art to which it appertains to make and use the same.

My invention relates to improvements in die-stocks of that class adapted for cutting tapered screw-threads upon gas-pipe, tubing, rods, and the like.

The object of the invention is to provide a simple, durable, and efficient machine in which there will be but little friction, so that less power will be required to operate it and more perfect work will be produced.

With the above and other objects in. view the invention consists of certain novel fea tures of construction, combination, and arrangement of parts, as will be more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a side View of my improved die-stock, one half of it being shown in elevation and the other half in section. Fig. 2 is an end view of the same, also showing one half in elevation and the other half in section; and Figs. 3 and 4 are transverse sections taken, respec tively, on the lines 3 3 and 4 4 in Fig. 1.

The embodiment of the invention illustrated in the drawings comprises a tubular frame 1, which consists of two sections 2 and 3,-through which the work is adapted to extend. The section or member 3 carries a series of thread cutting dies or chasers 4, while the section or member2 carries a work clamping device 5, and said sections or mem bers have a screw-threaded engagement with each other, as shown at 6. so that the cutting-dies will be fed to the work when the section or member 3 is rotated upon the section or member 2, the thread 6 serving as a feeding-screw. The work-clamping device comprises a guide-sleeve 7, which projects into the outer end of the section 2 and is adapted to receive the gaspipe or other work to be screw threaded and which is formed with apertures 8 to receive the inner ends of a series of radially-disposed clamping-screws 9. The latter have finger-pieces upon their outer ends, and their inner ends are beveled. or sharpened to bite the outer surface of the work.

The cutting-dies 4 are in the form of small blocks of steel which project through and slide in radially-disposed slots 10, formed in the outer portion of the section 3, which latter carries handles 11 or other suitabledevices by means of which it may be rotated. In order to cut the thread on a taper, the dies 4 are slidably mounted and have their outer ends engaged by the forward ends of levers 12, which are pivoted intermediate their ends, as shown at 13, between ears or lugs 14, formed upon the section 3, as clearly shown in Fig. 4 of the drawings. The opposite ends of the levers 12 engage and slide upon the outer tapered face of a cone-shaped spool or sleeve 15, which is loosely mounted upon the section 2 between an annular shoulder 16 and a circular nut 17. The latter is engaged with the screw-threads 6 upon the section 2 and is disposed within an annular recess 18, formed in the spool or sleeve 15. The levers 12 project between spaced lugs 19, which are formed upon the spool and are adapted to coact with lugs 20, formed upon the ends of said levers. The engagement of the lugs with the lugs 19 limits the outward movement of the section 3 on the section 2, and the engagement of the lugs 19 with the opposite sides of the levers 12 causes the sleeve or spool 15 to rotate with the section 3 and upon the section 2, said spool being held against longitudinal movement by the nut 17 In order to hold the work concentric within the frame and to keep the shavings from the feed-screw 6 of the section 3, I provide within the latter a combined guide and guard 21, which is in the form of a cylindrical sleeve adapted to have one end abut against the inner faces of the dies 4 and its other end formed with a beveled portion 22, which serves to guide the work when inserted.

The operation of the device is -as follows: When it is desired to out a tapered screw thread upon a gas-pipe or the like, the section 3 is screwed out upon the section 2 until the lugs 20 engage the lugs 19 or until they are adjacent thereto. The gas-pipe or other work is then inserted in the frame through its rear end and the section 2 is clamped to it by tightening the thumb-screws 9. The section 3 is then rotated to cause the dies 4 to advance upon the end of the pipe and cut screwthreads therein, the threads being the same as the threads of the feeding-screw 6. As the section 3 moves inwardly upon the section 2 the rear ends of the levers 12 will slide inwardly upon the tapered face of the cone shaped spool 15, thereby allowing said ends of the levers to come nearer together and al lowing the opposite ends of the levers, which engage the dies 4, to move farther apart. To remove the pipe from the device, the section 3 is revolved in the opposite direction until the lugs 20 engage the lugs 19, and the thumbscrews 9 are then loosened. Owing to the small amount of cutting-surface which the dies 4 offer, there will be a comparatively small amount of friction, so that the machine will Work easier and there will be little or no danger of the threads heating or sticking to the dies and peeling off when the latter are backed.

Various changes in the form, proportion,

and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described my invention, What I claim as new, and desire to secure by Let.- ters Patent, is

1. A device of the character described comprising a frame'consisting of tubular sections having a screw-threaded engagement with each other, a work-engaging clamp carried by one of said sections, a screw-thread-cutting die carried by the other of said sections, a lever pivoted upon said die-carrying section and engaged at one end with said die, and a beveled spool upon said clamp-section adapted to engage the opposite end of said lever to cause said die to cut a tapered thread.

2. A die-stock comprising a tubular frame consisting of a die-carrying section and a work-clamping section, said sections having a screw-threaded engagement with each other, 4 5

set-screws upon said clamp-carrying section, a loosely-mounted cone-shaped spool upon said clamp-carrymg sectlon, a ring-nut for holding said spool in place, a series of radiallydisposed slidable dies in said die-carrying section, and a series of levers pivoted upon said die-carrying sections and each having one of its ends engaged with one of said dies and its other end engaged with said spool, substantially as described.

3. A die-stock comprising a tubular frame consisting of a die-carrying section and a longitudinal movement, lugs upon said spool,

a combined guide and guard sleeve Within said diecarrying section, radially-disposed dies slidably mounted in the last-mentioned section, levers pivoted upon saiddie-carrying section and each having one end engaged with one of saiddies, and its opposite end projecting between the lugs upon said spool and engaged with the outer face of the latter, and lugs upon the last-mentioned ends of the levers adapted to ooact with the lugs upon said spool, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FRANK V. ANDERSON. Witnesses:

JAMES B. GRAGG, EDWARD E. BARR.

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