US1125112A - Pipe-threading die-stock. - Google Patents

Description

'W. H. JU'ERGENS. PIPE THREAD-ING DIE STQCK. v APPLICATION FIL'D MAR. 10, 1914; 4

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. PIPE THREADING DIE vSTOCK. APPLICATION FILED MAR. 1o, 19.14.

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1 WINFRED H. JUERGENS, CLEVELAND, OHIO.

PlPE-THREADING DIE-STOCK.

To all 'wim it ma? concern:

' Be it known't at I, WINFRED H. Jona Gers, a citizen of the United States, and resident of Cleveland, in the county. of Cuyahoga and State of Ohio, have. invented vcertain new and useful Improvements lin Pipe-Threading4 Die-Stocks, of which f I hereby declare the'following to. be ajfull, clearJ and exact description, such'aswill enable others skilled inthe art to which it appertains to makeand use the same.

,The object of the invention is to vprovide a die -stock for cutting a taper screw. thread upon pipes or other cylindrical products,

and the invention comprises a body portion and a' movable .member therein, vin -which screw cutting dies are .slidably mounted and includes automatically -acting means permitting progressively .and continuouslyV moving the diesto lessen the depth of the cutl and to produce taper -threads as the -threads are cut farther into the .periphery of the work. i

The invention further includes the combi; nation and arrangement of parts and construction of the various details hereinafter described, shown in the accompanying drawings and specifically pointed outin the claims.

In the accompanying drawings Figure l is a central longitudinal section of the device; Fig. 2 is a plan view withthe die covers removed; Fig. 3 is a plan view of a portion of the cam stud ring; Fig. 4 is a de-` tail view of one of the operating cams.; Fig. 5 is a perspective view of one of the dies; Fig. 5- is a view of a cylindrical member used in place of one of the cams whenia Istraight 4screw thread is to be-cut; Fig. 6

is a plan view of a die stock showing step? ping Hblocks intermediate of the dies and cams, by means of which the dies can be adjusted to cut taper threads'upon pipes of diierent diameters; Fig. 7 is a perspective view of one of the stepping blocks; Fig. 8 is a perspective yview of one of the dies adapted for use therewith; Fig. 9 is atplan view of one of the die covers; Fig. l() is a transverse section of die and cover on line Fig. 9 showing the operating pin for one ofthe stepping blocks.

Iii-these views A is an annular member which is passed over the end of. the pipe upon which thescrew threads areto .be cut.

Within this member is secured -a sleeve Al through which the pipe passes and to which it is. Seemed .by one or 'mere @caserme A2.,

specification vof :Letters raient. Pawnee@ JmL 19, 1915,',

- Appiicaan fue@ irma in, 1am. serial No. 823,654.

Athird member A3 provided with a leadY screw a of the samepitch as the pitch of the threads to be cuton the pipe is attached to the member A and is provided with a shoulder a' spaced'ffrom the end-of the member A to form' a bearing for the disk D herel inafter described. lThe members A, A and A3 are stationary. Y

B is a rotatable disk or body which car.4 riesra dially movable dies C, C, which move,l

in guide grooves B', B and are regularly' Y spaced in the disk B. 'These dies are provided with screw ,threads C, G, having-entf ting edges c2, c2, at the'inner ends.- The disk is provided with an integral tubular and central extension B2 through-which the pipe vpasses and "which is externally Iscrew `threaded'at b to correspond With the-,insy

ternal screw thread a upon the stationary member A3. Handles E, E, are attachedto the4 'disk B at F, F, by means of which the disk is rotated;

As shown-in Figs. l and 2 .in the disk B at the rear of the dies are rotatably secured the cams G, G which make contact with the endsv of thevfdies and they are partially r0-` ably secured to the disk D by means of screw threaded extremities d, ci, and nuts d', d. The studs H pass 'through openings g, g, in the cams, and are provided with spiral grooves i, 7L which are engaged by, pins g',-

g in the openings in the cams. f

In operation, as the disk B revolves and is fed longitudinally lof the stationary members A3 bv means of the lead screws the studs H, H, will pass through the cams vand rotate the cams so as to permit the dies to l.

` move continuallybackward and the cutting edges of the dies will gradually be removed from the pipe, thus cutting a ,screw thread of gradually decreasing depth in the end of the pipe. Over the dies and cam are placed the retaining caps or cover I, I, which are provided with ineloserl openings l I to rcy ceive the ends of the studs as they are forced through the cams. The dies are prevented from falling'out by means of spring pressed balls Q, Q, which lie in grooves Q', Q in the dies, and permit a certainfamount. of

- to cut threads upon several sizes of pipe, andV provided with several surface levels, o, fu, I

movement in the dies, while limiting its eX- tent. Adjusting screws Q2, Q2 pressing upon the springs Q3, Q3, permit of the control of the amount of pressure exerted thereby. v

`When fine adjustment of the dies is r`equired to produce threads a trifle oversize or undersize, or of standardsize, the bases W upon which the operating studs for the cams are set are provided with a series of spaced openings circula'rly arranged therein and each stud is provided with a parallel pin X adapted for selective insertion in said holes, thus varying the angle of advance or retard ot the studs and having a similar effect upon the cams. rlhe central opening w of each series of openings will controlthc standard size'` the holes at the left the undersize and the holes attheriglit the oversize.

ln Figs. 6, "7, 8, 9, and 10 an additional feature ist introduced showing a stepping block V introduced between each die block and cam, permitting the die to be advanced o2, o3", against which the die block will rest when cutting pipes of two inch, 171; inch, 151; inch and'l inch diameter respectively, or of any other required dimension. p

The die block is cut away at et, to provide clearance as the extremity of the die block giligages the .several steps upon the stepping ook. ping block a slot S is formed and in thisis and into an opening S in the stepping block a pin S2 is inserted by means of whichfthe stepping block is moved from one position to the other. Anf-index upon the cover at one side of the "slot permits the necessary provided with a corresponding lead screw, dies radially movable in said tubular body,

cams rotatably mounted in said tubular` adjustment to be made.

Having describedtheinvention what l claim as new and desire to secureby Letters Patent is. l,

l. In a die stock lfor cutting a tapering screw thread, in combination, a tubular'sta-I tionary portion provided with a lead screw, a revoluble body portion provided with a corresponding lead screw and having a central opening, and radial guides therein,ydi es movable in said guides, a cam for operating each die and havingacentral opening, a revoluble disk upon A"said stationary member, studs projecting from said revoluble disk through vsaid opening in said cams, said studs provided with spiral .engaging means,

and'c'orresp'onding engaging vmeans upon said cams in said central openings therein.

2. ln a die'stock,.in combination, a tubular stationary member provided with a lead screw, atubular body rotatable thereon, and

In the -cover for the diesv and st'cp-V anemia stationary member provided with a lead screw, a rotatable tubular body provided with a 'corresponding lead screw and mounted thereon, dies radiallym'ovable in said tubular body, a rotatable cam for operating each die and having a central opening, a spirally grooved stud passing through each cam opening, engaging means on each cam for said grooves in said studs, a member revoluble with said tubular body to which all said studs are rotatably secured, and means for adjusting the angular position of each stud upon said support to control the amount of advanceand retard of said cams;

4C. ln a die stock, in combination, a stationary tubular member provided with a lead screw, a tubular body member rotatable thereon and provided with a corresponding lead screw, dies radially movable in said tubular body, cams for operating said dies, spirally grooved'studs passing through and engaging said cams a'coinrnoii sup-part for said studs, said support rotatable with said tubular body, and covers for said dies, cams studs, said covers permitting the free operation thereof, andimeans for limiting .,tlie movement of said dies.

screw, dies radially movable in said body,

stepped blocks engaging said dies and adjustable in said bodv, cams rotatable -in said body and engaging said stepped blocks, and means for automatically-rotating said cams to progressively advance said stepping blocks and dies as said body is advanced by said lead screw.

6. The combination in' a die stock, of a tubular rotatable member having a lead screw, and a tubular stationary member having a corresponding lead screw, dies radially movable in said body, adjustable stepped blocks vengaging said dies, cams engaging said

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