U.S. Patent Specifications

In a machine for bending to a desired longi‐tudinal curvature an elongated work‐piece of material having a cross section characterized by concavities, the combination of: a pair of juxtaposed rollers having substantially parallel flat treads facing each other; a work engaging elongated combination supporting and forming means of greater strength against flexure than the work piece and having a cross section so complementary of the work piece cross section as to provide an assembled body having two external surfaces so contoured and spaced in cross section as to be simultaneously flatly pressurally engageable with said treads respectively, said body being longitudinally movable between said rollers with said surfaces engaging said treads, said supporting means including an elongated member longitudinally curvate in a plane perpendicular to the axes of the rollers, and further including means for securing said elongated member and work piece at one end against separation in said perpendicular plane, said supporting means being interchangeable with other similar supporting means; means to laterally engage and prevent lateral movement of said body across said treads in a direction parallel to the axes of the rollers as it passes between said rollers; and means for rotating at least one of said rollers to pass said body between said rollers, whereby when said elongated member and work piece are thus secured and said body at the secured end is introduced between said rollers, and said rotating means is energized, said work piece is bent to the longitudinally curvate contour of said member.