US 1462673 A
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Description (OCR text may contain errors)
- Jul 24,- 1923.
J. ,s. WHEELER BENDING MACHINE 1919 3 Sheats-Sheat- "priginal Filed Feb. 5
1911 5. .Wl/[ELER Patented July 241, i923.
UNHT earns JOHN S. WHEELER, OF DUNSMUIR, CALIJFURNIEA.
Application filed. February 5, 1919, Serial No. 275,164. Renewed August 10, 1921. Serial I60. 661L286.
To all whom it may concern:
Be it known that I, JOHN S. WHEELER,
a citizen of the United States, residing at Dunsmuir, in the county of Siskiyou and State of California, have invented certain new and useful Improvements in Bending Machines, of'which the following is a specification'. This invention relates to machines for bending pipes, bars and the'like, and the main object is to improvethe construction and arrangement of parts whereby to obtain greater efliciency in machines of the type disclosed in Letters Patent No. 1,206,742 and No. 1,206,743, granted to me November 28, 1916, and No. 1,263,301, granted April it, 1918.
One embodiment of the present invention is illustrated in the accompanying drawings in which- Figure 1 is a side elevation of the improved machine;
Fig. 2 is a plan view;
Fig. 3'is a longitudinal section;
Fig. 4 is an elevation looking at the side opposite that shown in Fig.1;
Fig. 5 is a horizontal section of the pressure mechanism,
Fig. 6 is a plan view partly in section of a slightly different form of the pressu e mechanism;
Fig. 7 is adetail cross section on the line 7-7 of Fig. 6;
Fig. 8 is an enlarged detail section showing the engaging portion of the form block and presser block.
Numerals l and 2 indicate end sill supports for girders 3, upon which are rigidly secured the bases 4 and 5. In the bases are secured upright stationary standards 6 and 7, which support the table or bench 8 consisting of an oblong frame provided at its ends with hubs or collars 9 fitting around the standards. Set screws 10 mounted in said hubs or collars bear upon the standards to secure the bench in 1place. The bench is provided with a plura ity of longitudinal slots 11 in one I of which the stationary work holder is to be mounted. It will be understood, of course, that any number of these longitudinal slots may be provided so that the work holder may be secured at the position most advantageous for the work in hand without changing the method of operating the machine.
Upon the standard or post 6 is rotatably ,mounted a gear wheel 12 meshing with a and a form block 19 is keyed upon said re-' duced portion. A bar 20, held by a lock washer 21 and cap screw 22, is disposed above the form block as shown in Fig. 3. From the collar 9 extend lateral arms 23 upon which are fastened two circular stationary tracks 24: and 25 concentric with the standard 6. A clamp or work holder 26 for securing the tubing 27, or other material to be bent is slidable in one of the slots 11 in the bench and overlaps the slot so as to rest on the bench at the sides of the slot. For securing the work holder in place, a stud or bolt depends therefrom through the slot 11 and nut 28 thereon is turned home against a washer 29 bridging said slot below and bearing against the bench.
The bar 20 is disposed over the bar 16 and is connected thereto so as to move therewith by clamping bolts 30 and plates 31, a spacer 32 being disposed between the bars. The bars 16 and 20 constitute a frame pivoted on the portion 18 of the standard 6 for the operation of a presser block 33 having grooves in its respective sides to accommodate tubes or rods of various diameters. Any convenient or preferred means may be utilized to cause the frame to turn about the post 6 under the influence of the wheel 12. In Figs. 5 and 6, is shown a portion of a coupling bar 34 which is attached to bar 16 and may be engaged with the gear by any detachable connection. In Figs. 1 to 4: inclusive, the presser block 33 is shown in the operating position, the end of the work being clamped by the work holder and the portion to be bent passingj between the form block 19 and the presser lock. The presser block is held to the work by a slidable holdas will be readily understood. In Fig. 5,
the full lines indicate the inoperative position while the dotted lines indicate the operative position, and it may be here noted that the seat of the saddle has a portion 39 at a right angle to the edge of the bar 16 and an outwardly and rearwardly inclined portion 40 so that, if the resistance of the .work is high, the presser block may rock and thereby avoid crowding of the material, permitting adjustment of the strained section and preventing fracture. The lever connections will accommodate a slight resistance but under the heavy stresses of overcrowding the block 38 may slip and thereby avoid breakage of the working parts. stud or dowel pin 41 (see Fig. 5) may be provided on the lip 42 of the saddle to engage a socket in the end of the presser block and thereby center the said block but the lip may be smooth and plane, as shown at 43 in Fig. 6.
In Fig. 6, the lever connections are omitted and the saddle 44 is secured in place by bolts inserted through clamping plates 45.
This arrangement permits the saddle and preser block to be readily adjusted to the work in hand, and it is to be understood that form blocks of any desired contour may be employed, the block 19, for instance, being adapted to form a complete coil and the block 46 being adapted to form a quarter turn. 7
The saddle may also have a lateral horn 47 terminatinginastop lug 48 which will prevent release of the presser block when it rocks on the surface 40. 'It is to be understood that the shaft portion 18 may receive a form block of any shape and size. the grooves therein being varied as desired and the same variation may he carried out in the presser blocks. It is to he noted that the grooves on the presser and form blocks fit the work tightly so that the bending operation is performed with full eflicicney. As shown in Fig. 8, the lip portions 49 of the groove 50 of the form block are slightly deeper from the radius center line 51 than the lips 52 of the groove 53 in the presser block so that the form block holds the material after forming as the presserblock yields. v
Upon the standard 7, a work table or pan 54 is provided. as shown, secured by a washer 55 and cap screw 56. In operation: The material to formed, for example the tubing 27, is clamped in the work holder 26 and extends within the grooved portion of the stationary form block 19. The presser block provided with a similar groove to suit the work in hand, is interposed between the tubing and the saddle, whereupon'the shift lever 37 is operated to the dotted position as shown in Fig. 5 to secure the presser block against the tubing. The frame consisting of the bars 16 and 20, with the associated parts, is then swung about the post 6 as a center, exerting pressure upon the work through the block 33 to bond the work against the form block 19. \Vhen the bending operation is completed, the working parts are returned to their initial positions and the work holder and the presser block released to permit removal of the. work. The operation may then be repeated indefinitely.
An adjustable spacer or filler 54', clamped in the slot 11 by a nut 55' and a washer 56' upona stud 57 secured in the filler. may be employed to bridge the gap of the track 25 which appears in Fig. 2. \Vhen special work requires the placing of the work holder in the slot containing the filler. the filler is readily removed.
The modified form of saddle shown in Fig. 6 is adapted for work for which the'toggle operating mechanism shown in Fig. 5 is not applicable. the arrangement allowing for shorter looping forms. It is to be understood that the'machine may be built in many sizes to facilitate the various size pipes, tubings, structural shapes, or other material to be formed and that modificationsmay-be made therein to simplify and improve the operation without departing from the spirit of the invention as the same is defined in the following claims.
Having thus described the invention, what i I claim as new and desire to secure by Letters Patentof the United States is:
-1. A bending machine comprising stationary posts, a frame supported by and extending between said posts, a stationary circular track secured to one end of said frame concentric. with the post supporting said end of the frame, a. work holder adjustable longitudinally in the frame and disposed eecentrica-lly to the adjacent supporting post and the track, form block secured on said post and arranged above the frame. a carrier consisting of similar members pivoted to said post respectively above and below the form block, a holder mounted between and. held by the carriermembers and adjustable longitudinally thereof toward and from the form block, and a presser block seated against said holder and cooperating with the form block.
2. A bending machine comprising a frame. a work holder arranged thereon, a form block secured on the frame, a pivoted carrier arranged concentric with the form block, a saddle in said carrier having its working face opposed to the form block and a portion of-said face inclined awayfrom oeme 5 the form block, and a, resser block seated and. a portion of said face inclined mm m inthe snddle and adapted to rock on the from the form block, retaining lips on sni face thereof. face at the ends of the same, and e, resser 3. A bending machine comprising a block carried by the saddle and adapted to 5 frame; n work holder arranged thereon,' a rock on the. inclined fece thereof. between form block secured in the'frnme, n pivoted the lips thereon. 1o cdrrie arranged concentric with the form In testimony whereof I nfin my signnture. block a saddle insaid carrier having its working, face opposed to the form block JOHNS. WHEELER, [Inn]