GB337312A - Compressed air plate holder for double drawing on single action presses - Google Patents

Abstract

337,312. Schuler Akt.-Ges., L. April 12, 1929, [Convention date]. Cupping.-A double cupping press is provided with outer and inner draw rings d and c resiliently supported by fluid pressure pistons so connected that at the end of the first drawing and descent of the ring d, the ring d takes away part of the fluid pressure support of the inner ring c. The rods r of draw ring d are connected to the fluid pressure support piston q and also carry a ring to which after an adjustable distance lag engage the flange u of a nut v coupled by a casing o to the second fluid pressure piston p which supports the draw ring c. The fluid pressure piston n then becomes the only support of the draw ring c while the metal is being drawn over the fixed mandrel a. All the pistons are supplied with fluid pressure from a blast box which on raising of the die W strips the work and restores the parts to normal. x is a fixed shearing ring. In a modification the upthrust of the bottom piston n is replaced by a spring.