Jan. 14, 1947. _ A. HOSSFELD l2,414,151 i IRON BENDING MACHINE Filed MayÍs, 1944 (MW ÍM5@se. _j /ßi»2 Patented Jan. 14, 1947 2,414,151 UNITED STATES PATENT OFFICE ` 2,414,151 ‘IRON BENDING MACHINE Albert Hossfeld, Winona, Minn. Application Mil-y 3, 1944, Serial No. 533,963 1 1 Claim. My present invention relates to improvements in iron bending machines of the type disclosed and broadly claimed in my United States Letters Patent No. 1,832,210, issued November 17, 1931, (Cl. 153-45) 2 block I4, the front and back thereof being on arcs of circles that are concentric with the face of the master die II. This radius block I4 is po and entitled “Die for bending angle bars.” sitioned over the work-supporting table I3 and therefrom. tegral with said block and affords a base of re has in its back a pair of notches I5 into which The objects of this invention are: ñrst, to pro the wedge-acting members I2 project. The bot vide a simple and highly efûcient machine for toms of the notches I5 are upwardly and out bending a ñat metal bar in the plane thereof; wardly inclined and slidably engage the oblique second, for holding the bar from buckling while bending the same; and third, to permit free end 10 under 'surfaces I5 of the wedge-acting members I 2. On the under side of the radius block I4 wise feeding movement of the bar in the ma is a curved rib-like stop member I 'I that is in chine when the bending pressure is removed sistance for a nat iron bar :v resting flatwise on To the above end, generally stated, the inven tion consists of the novel devices and combina 15 the work-supporting table I3 and being bent in the plane thereof. Or in other words, the stop tion of devices hereinafter disclosed and claimed. member Il takes the thrust of the bending pres In the accompanying drawing, which illustrates sure applied to the bar x by the bending block the invention, like characters indicate like parts I9. This stop member I'I is on a segment of a throughout the several views. circle that is concentric with the front and back Referring to the drawing: 20 surfaces of the radius block I4. Fig. 1 is a fragmentary plan view of the imA stop block I8 on the main frame 5 is pro proved iron bending machine, Isome parts being vided for holding the bar a: against the stop mem shown in section; ber I'i and a bending block I9 is mounted on the Figs. 2 and 3 are views in vertical section taken on the line 2_2 and the irregular line 3-3 of 25 swinging frame I5. These two blocks I8 and I9 are identical, the one with the other. The stop Fig. 1; and block I 8 extends between the bars 9 and is secured Fig. 4 is a bottom plan view of the radius block. thereto by a pivot pin 29. This pivot pin 20 ex The improved bending machine includes a sta tends through one pair of a plurality of longi tionary main frame 5 and a swinging bending tudinally spaced holes 2l in the bars 9. frame 6 attached to said main frame by a pivot The bending block I9 is interposed between pin 'I for horizontal swinging movement. Said the bars Ill of the swinging frame 6 and secured main frame 5 is rigidly secured to a bench or thereto by a pivot pin 22. The pivot pin extends other support, not shown, by a plurality of nut through one pair of longitudinally spaced holes equipped bolts 8. 23 in said bars. Each frame 5 and 6 includes a pair of verti- . As shown, the left-hand end portion of the cally spaced fiat bars 9 and Ill, respectively. The bar œ has been bent around the stop member inner end portions of the bars I0 of the swing Il on the arc of a circle havingV the same radius ing frame B are interposed between the adjacent as the engaged edge of said member. The other ends of the bars 9 of the main frame 5 with a close working fit. The pivotV pin l extends 40 end portion of the bar a: is straight. This bar :z: rests on the work-supporting table I3 and, in through aligned holes in the bars 9 and iû. A turn, the radius block I4 rests on the bar :12. It is hand lever, not shown, is attached to the outer important to note that the radius block I4 is out ends of the bars I9 for use in swinging the of contact with the master die II and its stop frame 6. member I'I is out of contact with the work-sup A master die II is interposed between the bars 45 porting table I3. ` I0 and pivotally secured to the pairs of bars It will be noted that the bar œ, at its outer edge, 9 and I0 by the pivot pin 1. Integral with the engages the stop block I8 and is held thereby master die II is a pair of forwardly projecting wedge-acting members I2. Also integral with the master die II is a forwardly projecting work- » supporting table I3, located bel-ow the wedge acting members I2. The outer faces of the mas ter die II and the outer edge of the work-sup against the stop member I'I. The bending block I9 is in engagement with the outer edge of the straight portion of the bar .r and considerably in advance of the curve in said bar. . Obviously, by pulling the swinging frame 6 toward the bar :11, said bar will be bent in the Co-operating with the master die II is a radius 55 plane thereof by the contacting bending block I9 around the curved stop member I'I. During porting table I3 are on arcs of concentric circles. Y 2,414,151 3 4 In a device of the class described, a die having bending of the bar zu, the pressure thereof on the a work table for Isupporting thereon a flat piece stop member I'I will force radius block I4 toward of metal to be bent on the arc of a circle, a radius the master die I I. As the radius block I4 moves block overlying the table to be supported on the toward the master die I I, the engagement of said radius block I4 with the wedge-acting members I2 Ul bar and having on its under side a stop shoulder` to be engaged by the bar at its inner edge, and will force the radius block I4 downwardly onto the holding the bar with its outer edge portion out underlying bar œ. It will thus be seen that the wardly of the die and the radius block, the faces bar :l: will be tightly clamped i‘latwise between of the die and radius block and the stop shoulder Work-supporting table I3 and the radius block being on the arcs of circles, the width of the stop I4 and thereby prevent buckling of the bar :I: A shoulder being less than the thickness of the bar, during bending thereof. whereby said stop shoulder is out of engagement The above described iron bending machine will,V with the table, a stop to be engaged by the bar in actual usage, be provided with a plurality of at its outer edge for holding said bar with its radius blocks having stop members I1 of differ inner edge against the stop shoulder, a bending ent radii. The master die II will take care of quite a range of sizes of radius blocks I4 from small radii up to quite large radii. The drawing illustrates a commercial form of the invention, but it will be understood that the device operative on the outer edge of the bar in advance of the stop for bending the bar on the stop shoulder, and means actuated by pressure generated by bending the bar to force the radius> same is capable of certain modifications as to de block onto the bar and clamp the same onto the tails of construction arrangement and combina tion of parts within the scope of the invention herein disclosed. table. What I claim is: ALBERT HOSSFELD.