US2113250A

US2113250A - Method of forming reducing-t's

Info

Publication number: US2113250A
Application number: US159701A
Authority: US
Inventors: Eugene M Cartwright
Original assignee: Chase Brass and Copper Co Inc
Current assignee: Chase Brass and Copper Co Inc
Priority date: 1937-08-18
Filing date: 1937-08-18
Publication date: 1938-04-05
Anticipated expiration: 1955-04-05

Description

METHOD OF FORMING REDUCING TS Filed Aug. 18, 193'? 5 Shee'ts-Sheet l April 5, 1938. E. M. CARTWRIGHT METHOD OF FORMING REDUQING TS Filed'Aug. 18, 1957 3 Sheets-Sheet 2 O/ .lel

April 5, 1938. lE; M. CARTWRIGHT 2,113,250

METHOD OF FORMING REDUGING TS Filed Aug. 1S. 1937 s sheets-sheet s %/Jllll J;

i ff

Patented Apr. 5, 1938 UNITED sTATEs PATENT or-'FlcE :413,250 METHOD or mamma nEnUcrNG-Ts Eugene M. Cartwright, Narni wdbury, om.,

assigner to Cline Brau Q Copper Co. Incorporated, Waterbury, Connecticut Conn.,

a corporation of Application Anm: 1s, i937, serial No. 159km Claims.

A further object of this invention is to provide an improved method of forming reducing-Ts without distorting the Ts out of shape due to the strain they are subjected to.

With the above and other objects in view, as will appear to those skilled in the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art.

In the accompanying drawings, in which one way is shown for illustrative purposes:

Fig. 1 is an elevational view partly in section of a cup-shaped blank for use in making the T- shaped blank from which the reducing-T is to be made:

Fig. 2 is a view in elevation and partly in section of the T-shaped blank before an end-wall has been removed; n

Fig. 3 is a view similar to Fig. 2 with one endwall removed from one of the run-tenninals to form the T-blank;

Fig. 4 is a view similar to Fig. 3 after the closedend run-terminal has been reduced;

Fig. 5 is a view similar to Fig. 4 of a nished male reducing-T after the end of the reduced runterminal has been removed;

Fig. 6 is a view similar to Fig. 5 after all the terminals have been expanded to finished form to form a female reducing-T;

Fig. '1 is a view in elevation of a portion of one form of press and die construction for carrying out the present invention, with the T-blank shown in Fig. 3 omitted;

Fig. 8 is a sectional view taken on the line 8 8 of Fig. '7 with the T-blank of Fig. 3 in position for the reducing operation;

Fig. 9 is a view similar to Fig. 8, with the parts of the press andA die at the end oi' the reducing operation;

Fig. 10 is a view similar to Fig. 8, with the parts of the press and die returned to their initial position and with the reduced-T blank ready for removal; and y Fig. 11 is a transverse sectional view taken on the line II-II of Fig. 10.

In the description and claims, the various parts and steps are identiiied by specinc names for convenience, but they are intended to be as generic in their application as the prior art will permit.

Referring to the drawings, the cup-shaped blank 20 shown 'in Fig. 1 may be produced in any suitable way, and is subjected to a series of operations to reduce it to the T-shaped form of the blank 2| shown in Fig. 2. In performing this series of operations, the lower end 22 of the blank `2|l is given a series of bulging-out operations, as

indicated by the broken line 23, and the blank -is shortened as indicated bythe broken line 24.

This series of operations for changing the blank 2lil into the blank 2| may be performed in accordance with the disclosure of the application Serial No. 141,936 of Franz B. Wendel, tiled May 11, 1937, or the blank 2| may be produced in any other desired or known way. 'I'he blank 2| next has its end-wall 25 cut oiI and has the thus opened run-end reamed out to produce the T- blank 26 of Fig. 3 ready for operation in accordance with the present invention.

- 'I'he press 21 has a press-bed 28 and a pair of spaced-apart upright-guides 28. The top or head of the press is not shown. A die-bed 3|) is xedly mounted upon the press-bed 28 in any suitable manner. Resiliently yieldable means, such for example as an air cylinder pad 3| is located in an opening 32 in the press-bed 28, and is normally forced `upwardly against the bottom o'f the diebed Why a piston (not shown) of an air cylinder (not shown) which is normally in communication with a source of supply of compressed air.

A mandrel 33 has a iiange 34 enga-ging against the die-bed and a screw-threaded shank or tang screW-threadedly engaged in a threaded hole in the die-bed 38. A backing-sleeve 36 is slidably mounted upon the mandrel 33 and has a base 31 normally resting upon a plurality of thrust-rods 38, preferably four in number, which rods 38 extend through holes 39 in the die-bed 30 and rest against the top of the air-cylinder pad 3|.

The mandrel 33 has air-relief hole 40 which intersects a. transverse air-relief hole 4| which by connection through fiat portion 44- is able to release air through one or the other of holes 42,`

UJI

The'slide 41 has a central hole 49 intersected by a slot 50 which extends across through the slide 41. The reducing-die 48 has a central hole 5l with an annular chamfered entrance 52 leading thereto. A knock-out or knock-out plunger 53 is slidably mounted in the hole 5| and has a shank 54 detachably connected by a screw 55 to a plug 56 which slides in the hole 49. The knockout bar 51 extends transversely through a hole 58 in the plug 56 and may be rmly secured therein, the opposite ends of the knock-out bar 51 being in position to engage the abutments 46.

In carrying out the method of making a, reducing-T in according with the present invention, a, T-blank of the form shown at 26 in Fi'g. 3 has its open run-end 59 placed down over the mandrel 33 and backing-sleeve 36, as shown in Fig. 8, with the branch end 60 extending out transversely from the backing-sleeve 36 and the mandrel 33 and with the closed end-wall 6! engaging over the upper end of the backingsleeve and mandrel. The press is then put in operation to bring the slide 41 and the closingi in or reducing-die 48 downward, the closing-in die engaging and reducing the closed run-end 62 by forcing thevbacking-sleeve 36 to retire against the resistance of the air-cylinder pad 3l concomitantly with 'the advance of the closing-in die 48 to the position shown inFig. 9. The press is then reversed to raise the slide 41 and the closing-in die 48, whereupon `the backing-sleeve 36 is forced upward by the air-cylinder pad 3l to thus strip the reduced T-blank 63 0E of the mandrel 33. The continued upward movement of the press-slide results in the knock-out bar 51 striking the abutments 46 and forcing the knockout plug 53 downward and thus, in the event that the reduced run-end 65 frictionally adheres withthus shown when this T is to be used to have the run and branch ends inserted in the ends of pipes for connection thereto. Where, however, the connection with pipes is to be made by having the pipe-end inserted into-the run and branch ends, then the run and branch ends are enlarged to the female form shown in Fig. 6 by suitable expanding operations.

The invention may be carried out in other specific ways than that herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiment is, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.

I claim: y

1. The method of forming reducing-Ts, comprising: providing a T-blank having a run-portion and a branch-portion leading from the said run-portion intermediate the opposite ends thereof, the said run-portion including a rst terminalghaving a tubular side-walllwhich is open at its end and a second terminal having a tubular side-wall and an end-wall extending inwardly from the said side-wall; supporting the T-blank by means of the end-wall of its said second terminal and subjecting the said second-terminal of the T-bla-nk to a forming operation to reduce the diameter of the tubular side-wall of the said second terminal and add at least a portion of the material of the said end-wall thereof to the reduced tubular side-wall; and opening the end oi.' i

the now reduced second terminal of the T-blank.

2. The method of forming branch pipe-fittings having run-portions reduced at one end, comprising: preforming a branch pipe-fitting blank with open and closed run-ends; concentrically arranging on a mandrel sized to correspond to the desired reducedrun-end, the run-portion `of said blank with the closed end thereof supportably engaged by the end of said mandrel; subjecting the closed run-end thus supported to a drawing-down operation acting initially on the closed run-,end to draw down a peripheral portion of the end-wall thereof into conformity with the mandrel; extending the drawing-down operation along said mandrel to progressively reduce the closed run-end and merging the drawndown peripheral portion of said end-wall therewith; supporting the diminishing unreduced runportion of the pipe-fitting blank concentrically with respect to the mandrel'during the continuance of the drawing-down operation; and severing therequired amount from the outer end of the reduced run-end to render it open and of the desired length. o

3. The method of forming branch pipe-fittings with reduced and unreduced run-ends, comprisingzApreforming a branch pipe-fitting blank with a run-portion of uniform diameter from end to end and with an end-wall on one of the runends thereof; concentrically arranging the runportion of said blank on a mandrel sized to correspond to a desired reduced run-end with which the pipe-fitting lis to be provided and with said end-Wall in engagement with the end of said mandrel to support the blank from endwise displacement on the mandrel; interposing a yieldably-mounted backing-sleeve between said mandrei and said run-portion of the blank with its outer end in engagement with said end-wall; applying to said end-wall a reducing die sized to correspond to the desired reduced run-end, to the end-wall at the outer end of said run-portion, whereby a portion of said end-wall is converted into a reduced side-wall; moving the reducing die axially along the mandrel and forcibly receding the backing-sleeve as the reducing action continues; and in severing an end portion of the reduced run-end therefrom to render it of predetermined length.

4. The method of forming a branch-fitting having a run-portion comprising unreduced and reduced run-ends, comprising: preforming a branch-fitting blank with the run-end to be reduced at least partly closed by an end-wall; concentrically arranging the run-portion of said blank on a mandrel sized to correspond to the desired reduced run-end by means of a backingsleeve; placing said run-portion of the blank to be supportably engaged by the end of said mandrel to be held against axial movement thereon; applying a reducing-die sized to correspond to the exterior surface of the desired reduced runend to the supportably-engaged run-end to draw down at least a. portion of said end-wall into conformity with said mandrel; moving said drawdie along said mandrel to merge said end-wall portion in the reduced run-end; continuing the drawing-down operation while causing the backing-sleeve to recede in synchronism with the advance movement of the draw-die whereby the Cil gation of the run-end during its reduction; and in severing the outer end-portion from the reduced run-end to render said run-end of predetermined length.

5. The method of forming reducing-dies, consisting in: forming a T-blank with one of its run-ends open and with the other of its runends, at least partly, closed by a transverse Wall; placing the run-portion of the T-blank over a sizing mandrel with said transverse wall in engagement with the end of said mandrel to prevent axial displacement thereon; `subjecting the run-end with the transverse wall to a drawing operation on the mandrel to reduce its diameter while incorporating in the reduced tubular wall thereof at least a portion of the said transverse Wall; centering the run-portion of the'T-blank and supporting the diminishing unreduced remainder of the run-end being reduced by means of a backing-sleeve slidable on the sized outer wall of the mandrel and displaceable by the drawing operation, and in severing the outer end of run-end of predetermined length.

EUGENE M. CARTWRIGHT.