GB191207593A - Improvements in or relating to Machines for Making Lock Joined Angular Metal Tubing. - Google Patents

Abstract

7593. Stander, J. March 28. Angular bending; bending-dies.-In a machine for making angular tubes for bedsteads &c. with a seamed joint, the metal sheet is clamped to a table by a plate with a projecting rib, and the edges and also the sides are bent by a hinged plate, which presents a flat top surface normally flush with the table, and which has a groove to receive the first bent edge when the third or return bend is being made. The sheet s is clamped to a table b with a hardened portion i by a projection x on the hardened piece h of a plate f<1>, which is operated by a lever and a pair of eccentrics e<1> on a shaft c. The bending-die consists of a plate k having a groove k<1> to receive one of the edge bends and is clamped to a plate j, which is mounted on pivots j<1> and normally maintained in its vertical position and also counterbalanced by weighted chains connected to a pair of arms j<2> mounted on the pivots j<1>. The edges are first bent in turn by placing the sheet with the edge in line with the front of the plate k and then turning the plate j<1> by the aid of a pair of handles j<4> to bend the sheet against the outside edge of the plate h. The underside of the plates h, f<1> is cut away to make room for the bent edges of the sheet. One of the edges is then placed in engagement with the groove k<1>, and a bend such as 3 is then made, the angle of the bend being determined by a stop placed in one of a number of holes in the frame a and engaged by the arm j<2>. The bends 4 and 5 are next made, the blank being placed so as to abut against shoulders n<1> on a number of adjustable stops n fixed to angle irons m clamped to the plate j. In making the final bend, the edge 3 moves over the flattened upper surface of the plate f<1> but assumes the desired position owing to the elasticity of the metal when removed from the machine. The joint is closed in a separate machine.