US975184A - Elbow-bending machine. - Google Patents

Description

H. C. H. WALSI.' ELBOW BENDING MACHINE. APPLIoATIoN 31mm 22.19, 1909.

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H'. 0. H. WALSH.-

' ELBOW BENDING MACHINE.

APPLICATION FILED APB.19,'1909.

y 975,184. Patented Nov. 8, 1910.

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APPLICATION FILED APB.19, 1909.

Patented Nov. 8, 1910.

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UNITED sTATEs PATENT oEErcE.

HARRY C. H. WALSH, OF CHICAGO, ILLINOIS, ASSIGNOR OF ON E-HALF TO A. A. KINNE, OF MINNQEAPOLIS, MINNESOTA.

ELBOW-BENDING MACHINE.

Speciication of Letters Patent.

Patented Nov. 8, 1910.

To all whom it may concern:

Be it known that I, HARRY C. H. WALSH, a .citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Elbow-Bending Machines, of which the following is a specification.

This invention relates to improvements in elbow bending machines and has among its salient objects to provide a machine for formingv an elbow on a flat curve or curve of relatively long radius whereby the stretching` or torturing the metal at the upper radius of the curve is distributed over substantially the entire surface of the metal instead of being localized; to provide a construction in which one of the mandrels reciprocates toward the pivoted mandrel during the operation of bending the pipe in order to accomplish the above stated object; to provide a' construction which permits of the pipe being readily inserted upon the mandrels or removed therefrom; to provide improved means for clamping the metal in place upon the mandrels; to provide a device which is durable and economical in construction and simple and reliable in operation; and in general to provide an improved construction of the character referred to.

The inventionconsists in the matters hereinafter described and more particularly pointed out in the appended claims.

In the drawings-Figure 1 is a top plan view of the machine with certain parts shown in dotted lines in order to more clearly bring out the details of construction. Fig. 2 is a side elevation of the same with the mandrels shown in normal position. Fig. 3 is an end elevation partly in section taken on lines 3, 3 of Fig. 2 and looking in the direction of the arrows. Fig. 4 is an end elevation of the other end of the machine the operating handle or lever being shown in section. Fig. 5 is a fragmentary horizontal section and showing more particularly the construction of the pivotal mandrel.

Referring to the drawings 1 designates the base casting or bed plate provided at y either corner with an ear like extension 2 whereby it' may be mounted upon any desired supporting frame (not shown). At one end this casting is provided at opposite sides with a pair of up-standing guides 4, 4

a mandrel 8 of well known construction.

The base member 7 is secured between the guides 4 by means of confining plates 9 fixed to the respective guides'4 by means of suitable screw bolts 10. Near the inner end of the guide-way 3 the bed plate 1 is aper tured as shown at 12 to receive the journal stud 13 of a turret member 14. At its upper face the bed plate is provided with an annular base 11 upon which the turret member turns. The latter is provided with a rearwardly extending supporting bracket 15 which carries a mandrel 16. Each of these mandrels preferably takes the form of a hollow casting slightly bent inwardly in order to more accurately conform to the curvature of the elbow when the latter is being formed. As shown more clearly in Fig. 5 the mandrels are secured to their supporting brackets by means of suitable bolts 17, 17.

In order to lock the pipe upon the mandrels the latter are each provided with a pair of clamping jaws 18 and 19. Upon the rear end of each of the respective castings 6 and 15 Vis secured a journal block 2O at either end of which is pivotally connected a forked eX- tension 21 of the respective jaws by means of pivot pins 22 screw threaded through the rear ends of the forks and engaging suitable apertures formed in the upper and lower sides of the journal block as shown more clearly in Fig. 3. Each pair` of jaws is provided at its outer end with inturned lips 23 which it over inclined shoulders 24 formed upon the opposite surfaces of the mandrel whereby the pipe may be more securely clamped in position.

To 'clamp the jaws to the mandrels, through the respective bracket members 6 and 15 is loosely mounted a pin or rod 24 which also extends through the rear end of the corresponding clamping jaws 18 and 19. That end of the rod 24 which extends through the clamping jaw 18 is screw threaded as shown at 25 and is provided with a confining nut 27 which engages an annular boss 30 formed upon the opposed face of the jaw 18. This nut 27 is further locked in position by means of a jam nut 26. To the other end of the rod 24 is pivotally connected as shown at 29 a cam lever 31 having an operating handle 32. The cam surface 33 of this lever actuates a collar- 3t looselyH A,cfa bracke't having sliding movement yin mounted upon the rod 24 and adapted to engage the boss 28 carried by the clampingk jaw 19. The bracket members 6 and 15 are each counter-bored to provide socket mem-V bers 35z 35 in each of which is seated a coiled expansion spring 36.` These springsengaga the clamping jaws and automatically force the latter out of engagement with the mandrel when the cam surface 33 is swung out of enga ement with: the lock-in'gfring The sliding. bracket 6 carrying the mandre 8 isprovided at-its rear end'. with' fa lhandle 37 whereby it maybe bodily reciprocated in the guide i way.v Si1nilai"ly-.lthe pivoted bracket l-is provided with anfi operating lever 38 which is screw threaded as shown 'at 39 into the yjournal ,block 20.-- y

described-as follows: Theinandrel Sis reciprocated toward .the rear 'end of the guide way 3 bymeans ofthe handle 37 andthe pipe pla-cedin position uponthe mandrels, theendsfof the. pipe. extending, of course, between ,the clampingjaws.; The latter` are then forced into clamping engagement with the mandrels and lockedin this position by means of the cam levers 31.: Themandrel 16k is then swung on its -pivotloy means of the operatingI lever A38 and the pipe bent. It is tol be noted however that;the bracket 6 carrying the mandrel 8,.is-ree' to slide forwardly in its guide way. .Accordingly the` strain upon the upper periphery of the pipe due tothe stretching vof the metal wil-l be distributed over substantially the entire upper surfacesof the pipe. I This results from the fact that the pipe -is bent on a curve of .relatively large; radiusrather .than on 'aI curve of small radius as isthecase when one of the mandrels is held ,positively in fixed position during thebending of the pipe.

While Iy haverherein shown a preferred embodimentof .my invention it is apparentl etails;

that it maybe more orl less varied in of construction without departing from the spirit thereof.

I claim as myv invention 1.- Iii-a pipe bending machine, `the combination with a main frame provided with a guide -way extendingy longitudinallyA thereof,

said guide-way, a second bracket pivotally connected to the main frame by a fixed pivot, a mandrel rigidly mounted in each bracket, 'means for clamping a pipe on said mandrels, .and leverage mechanism for r0- tating the second bracket, said parts being 'so arranged that uthe first bracket has sliding movement and the second bracket rotary movement during the operation of bending.

the pipe. v. g, v, n 2. In a .pipe bending machine,- the combination with amainframe having a guide.-

;way extending longitiidinally' thereoifof a bracket mounted-to slide ."freely in'said guide-way, a secondbracket pivotally vcon- 1 v nected to the main frame by axed pivot, a v The operation ofthe device maybe briefly mandrel carried by each` bracket, means for clamping the pipe to veach mandrelv compris- .ing a .journalipm extending 'transversely' lthrough each bracket, a l:pair of clamping yjaws carried by opposite vendsof saidY pin, lcam leverage mechanismfor'=.shifting` said rod to force the Ij aws into clamping engage-Y ment with thevmandrel, yand springs seated in sockets formed' in each bracket and normally forcing the clamping jaws out of engagement with the mandrel, and leverage mechanism for rotating the pivot'bracket, said parts being so arranged that' the -rst bracket slides freely in itsguide-wayfand the second bracket: lrotates on its pivot `during the operationof bending the pipe.

3. In a pipe bending machine, the combination with a main frame, of a mandrel having free sliding movementtherein, a second mandrel pivotally mounted to the main frame bya stationary pivot, and locked against sliding movement, means' for clamping a pipeto said mandrels, said'parts being `so arranged that said mandrels have dier-V ent movements during the operation 'of bendingr the pipe, the rst mandrel having sliding movement and the second rotary movement. f '.f

, HARRY C. H. WALSH.

VVit'nesses:y i

EMILIE ROSE, Lois FORCE.'

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