Pipe-bending apparatus

Details Pipe-bending apparatus Pipe-bending apparatus

1981-09-17

1983-09-27

Crosby, Gene

Metal deforming

By relatively movable offset tool-faces

Embodying three or more coacting relatively movable tools

72389, B21D 905

Patent

active

044061471

ABSTRACT:
An apparatus for bending a pipe about a fixed forming member serving as abutment has members gripping the pipe externally as well as two mandrels intended to come inside the pipe. Each mandrel has an end piece movably carried by one end, the end pieces being against each other inside the pipe at the beginning of bending. During the initial bending phase, each end piece is urged outwards from the bending center to expand the pipe to such an extent that after terminating bending, the pipe is given a circular cross section subsequent to a certain amount of return spring of the pipe wall.

REFERENCES:
patent: 1903436 (1933-04-01), Brown
patent: 2528315 (1950-10-01), Martin
patent: 3209570 (1965-10-01), Hills

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