Metal deforming – By or with work-constrainer and/or manipulated work-forcer – Comprising lever manipulated to force work
Patent
1979-05-29
1981-05-26
Moon, Charlie T.
Metal deforming
By or with work-constrainer and/or manipulated work-forcer
Comprising lever manipulated to force work
B21D 702
Patent
active
042690560
ABSTRACT:
An improved conduit bender of the type having a curved rocker base portion formed by a pair of laterally spaced, arcuate-shaped side walls which define longitudinally extending conduit-receiving groove means therebetween. A hook formation is formed at one end of the base portion and a treadle member is formed at the opposite end. The improvement includes the formation of two pairs of curved surface sections on the inner surfaces of the side walls which form a pair of vertically spaced overlapping conduit-receiving grooves therebetween to enable the improved bender to be used for forming bends in the four types of electrical conduits presently used in the building industry. The inner groove is used to bend the single type of thin-wall conduit (EMT) and the outer groove is used to bend the three types of rigid or heavy-wall conduits. The starting and ending points of the arcuate bending surfaces of the two grooves are offset 15.degree. longitudinally with respect to each other to provide full contact between the conduits and the bending surfaces of their respective grooves. The bending surface of the outer groove for the three heavy-wall conduits starts 15.degree. earlier and stops 15.degree. earlier than the bending surface of the single thin-wall conduit groove with respect to the hook formation end.
REFERENCES:
patent: 2233292 (1941-02-01), Lewin
patent: 2381064 (1945-08-01), Lewin
patent: 2584537 (1952-02-01), Benfield
patent: 2817986 (1957-12-01), Benfield
patent: 2906149 (1959-09-01), Benfield
patent: 3063314 (1962-11-01), Benfield
Crosby Gene P.
Moon Charlie T.
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