Drawing die for making a pipe elbow

Abstract

A die assembly for making tubing-elbow halves comprises an upper die half having an upper arcuate relatively long holder, a plurality of relatively short and arcuate upper die sections secured in an upper row to this upper holder and having arcuate and downwardly convex lower faces together forming an elongated and substantially continuous downwardly convex arcuate lower surface, and an upper end section at each end of the upper row and each having a generally semicylindrical downwardly convex face forming a continuation of the lower surface. This assembly also has a lower die half having a lower arcuate relatively long U-section holder, a plurality of arcuate lower die sections complementary to the upper arcuate die sections, and a lower end section at each end of the lower row of lower die sections and each having a generally semicylindrical upwardly concave face forming a continuation of the upper surface of the row of lower arcuate die sections. The upper sections are receivable within the lower sections to draw a flat piece of metal into an upwardly concave shape suitable for welding to another such element for forming of a tubing elbow. Moving of some of the arcuate die sections in each holder and rearranging of the end sections allows tubing elbows of various lengths to be produced.

Dependencies are inferred from the claim text.