Patent ID: 6748784
Filing Date: 2004-06-15
Classification: B21D

Abstract:
A portable sheet bending brake that includes:a support frame including a pair of elongated rails and at least two frame sections secured to said rails, said frame sections having downwardly opening pockets on an underside of each frame section that capture said rails on three sides of each of said rails, an elongated base member secured to said frame sections and having a clamp surface, an anvil member mounted on said support frame and movable toward and away from said base member for clamping sheet material against said clamp surface, and a bend member pivotally mounted on said base member for bending over said anvil member the sheet material clamped between said base and anvil members, each of said frame sections having a lower arm secured to said rails and on which said base member is secured, and an upper arm spaced from said lower arm, at least one pivot arm pivotally mounted to each said upper arm and to which said anvil member is secured, an elongated shaft extending between said upper arms and having a non-circular lateral cross section throughout its length, a handle coupled to said shaft, and eccentric cams on said shaft and engaging said pivot arms for pivoting said pivot arms toward and away from said lower arms, said cams being of integrally formed construction and having internal openings of non-circular cross section corresponding to that of said shaft for automatically timing said cams with respect to each other and to said shaft upon assembly of said cams to said shaft.