US2413523A - Bending machine - Google Patents

Description

Dec. 31, 1946. R. M. SHAW, JR

BENDING MACHINE Filed Sept. 17, 1943 2 Sheets-Sheet l Illlillllllll IZV Dec. 31, 1946. v R., M. SHAW, JR 2,413,523

BENDING MACHINE Filed Sept. 17, 1943 2 SheetsSheet 2 BY g c/EOE;

'A'r EYS.

Patented Dec. 31, 1946 assum MAQHIN Balp h MqSl aw, Jr Edgelwater -Park,-- N. J assignor to Pedrick 'iool 85 Machine Company, Philadelphia', 21., a corporation of Pennsyl- "mania I lanplicationtseptem e 1 Claim. (Cl. 5153746) This inventionrelatesste mach es usefu i bendin barscr tubes and jghas reference more particularly to. bending machines of the" type disclosed in U. S. Patent No. 2,266,912, granted .to m on.Decemb r 23, 9% V My present machinehas'for its chief aim to enable, through structural improvements and refinements such as hereinafter illustrated and described, fashioning in machines of the kind referred to, of straightbars or tubes into complete circles or even into spira-ls without inci- 'dentaldeformationof their original cross sectional-configurations onmarring of their surfaces.

How-the foregoing desideratum as well as other Qobjects'andattendant. advantages can be readily .wr'ealized' in practice .will appear .irom the following. detailed description :of ,the {accompanying drawings, wherein i is,. 1, shows in top splan a;ben it m ch onv ni ntly .em edy ng :m -.:pr s n i v o Fig. 3 isa perspective view of were the die Mmembersof the machine.

F, Eigs. 4- and-:5 are views .like l iigs .1 on. a smaller scale showing successive steps in .the' bending' 194o3l er alNe, 592573 Y Y 2 2 -2 fora tube T, which is to be bent, is supportedby the bed In On the top edge margin thereof.

"Instead of being circular as in the patent supra, -the stationary die element I5 is in the form of a sector which comprehends an arc of less than l80 t o be more exact of about 135- and which iskeyed to the stud M at 23 so as to Eig.- 6 shows; a c o mplete circular loop formed I in a tube'a'fter a 'few passes in the machine; and

Fig. 7 shows a spiral such as will result by continuing the bending after the stage shown in Fig. 6 has been reached.

Except as hereinafter particularly pointed out, the improved bending machine is generally like that disclosed in my above mentioned patent, said machine including a bed plate It] whereinto is recessed a rotatable disk II with peripheral teeth 42 engaged by a driving pinion I3. Fixed in the bed plate l0 and passing through an axial opening in the disk II is a cylindric post M which is diametrically reduced at its top and there supports a stationary die member l5. Fulbe-ireadily, removable for substitution of similar die; members of different sizes and/or shapes.

1 l\ loreover, in accordance with my present inentiqn the e i ie i l i mem 1' a t elrd e ero v 225 in it ,a at ed pe ltien wh c in the illustrated instance gs of "U. haped r ee t fi ei eeene. l; hise fig-i i in i e upw dl t th 91? e tai em entrant end 2 lie t I mi ia end at "2 Als i a ord ce .With my present invention the complemental movable die nte io sho i i .o a len some e excess of the arcuate peripheral extent of the stationa y d emembe l5. an p d .Wit

'. Q e' tud na1 rids "28 at i inn side, aid r d be n .Iof awidt ftp nugl en a e, W thinth "srneve 7.25 v e said, nonotat n die member. ,Eroin-zfi'issh2and 3 it, wi e ,.no ,.,th t.i th ,rree n k nst n the id .2 t sh e 2! is concaveden wi h the rounded bott m o th groove 25 in the non rotating die member l5 defines a die opening of circular cross section corresponding to that of the tube T.

The holder 22 is of novel construction in that it comprises a split clamp 30 with winged jamb crumed on the 'post I4 below the stationary die member I 5 is an arm I6, which, adjacent its outer end, is releasably secured by a latch pin I! to the top of the disk H so as to rotate with the latter. As shown, the arm I6 carries a follower roller l8 which is revolvably and axially free on a stud l9 capable of adjustment along a longitudinal slot 20 in said arm. The follower roller l8 bears against a straight elongate shoe 2| which constitutes the movable complemental or mating die member of the machine and cooperates with the stationary die member I5 in efiecting the bending. The holder indicated at nuts SI; and a supporting block 32 with a pendent stud 33 which slidingly fits into a socket hole in the top of the bed plate H), as well as with a vertical slot 34 for the free reception of a lateral stud projection 35 on the clamp 38. As a consequence of this construction, the holder 22 is free to swivel and to rise and fall during the bending while restraining endwise movement of the tube T; or, in other words said holder restr-ains the tube T. a

The operation of the machine is as follows: In preparation for the bending the disk I I is rotated to bring the arm IB into the full line position P inFig. l; the bar or tube T is secured in the holder 22 so that the distance from the ex- 3 by the curved arrow in Fig. 1 through an arc of 135 when the arm IE will have reached the position P in which it is indicated in dot-and-dash lines in said figure. As a consequence of the travel of the follower roller la in a circular orbit concentric with the arcuate edge of the stationary die member l5, the shoe 2| will assume difierent angular positions tangentially to said edge and cause the extended end portion of the tube clination of the groove 25, in said die member,

this action being facilitated by reason of the axial freedom of the follower roller l8 on its supporting stud I9 and by virtue of the ability of the holder 22 to swivel as well as to rise and fall in accommodating lateral movements of the re- .strained end portion of the tube T. With the first bend completed, the disk II is reversely rotated and returned to its original position P whereupon the bar or tube is shifted as shown .in Fig. 4 by a distance corresponding in magnitude to the peripheral extent of the stationary die .member 15 and again clamped by the holder 22.

The above described cycle of the machine is then repeated to move the arm I 6 fromthe position 'P to the position P in Fig. 4 thereby adding an- ,other 135 bend to the bend made in the first pass of the tube T- in the machine. After the formation of the second bend, the arm 16 is again returned to the position P as shown in Fig. 5 and the tube T once more shifted and re-clamped in the holder 22 for a third pass by which the arm I6 is a third time moved from the. full line position to the dot-.and-dash lineposition P.

the last described pass still another 135 is added, 'to the curvatures formed in the previous passes,

so that somewhat more than a complete circular loop results as shown in Fig. 6. By further repetitions of the above procedure, it is obviously'possible to fashion the tube into a coil such as shown in Fig. 7 which can be subdivided into a number of individual split ring blanks by cutting the same at one side along a line X-Y. After the cutting, the ends of the individual ring blanks are brought into line and welded orotherwise united to close the rings. The use of a stationary die of less than a half circle such as herein featured, is advantageous in that it permits ready removal of the work from the machine at any stage of the bending.

Solid bars of circular cross section of course lend themselves to ready bending in my improved machine in the form in which it is herein illustrated by way of example. Furthermore, by appropriately profiling the opposing faces of the cooperative die members l5 and 2| it will be apparent to those skilled in the art that my improved machine can be adapted for bending bars or tubes of other cross sectional shapes within 'the scope of the appended claim;

Having thus described my invention, I claim:

A machine for spirally bending bars, tubes or the like, comprising in combination a stationary die member in the form of a sector having a relatively deep inclined groove in its peripheral edge;

a complemental movable die member in the form of a straight elongate shoe having a longitudinal ridge for snug engagementwithin the outer edge limits of the inclined groove of the stationary die member to jointly form an opening conformatory with the cross-section of the bar or tube to be 'bent; a holder comprising a split-clamp and a pivotal supporting-block, said split-clamp having 'a projection slidably engaging a vertical slot in the supporting-block, thus enabling swiveling and vertica1 movement of the holder while positively restraining endwise movement of the bar or tube during the bending operation; and a follower roller movable in a circular orbit concentric with the edge of the stationary die member, whereby the elongate shoe assumes different angular positions'tangential to the peripheral edge of the stationary die member and progressively depresses the bar or tube into the inclined groove of said stationary die member. RALPH M. SHAW, JR.

Images