Pipe bending mandrel

Details Pipe bending mandrel Pipe bending mandrel

1977-01-14

1978-05-02

Larson, Lowell A.

Metal deforming

Tool and/or tool holder

Including flexible or yieldable tool or support

B21D 903

Patent

active

040868036

ABSTRACT:
A pipe bending mandrel having a housing assembly of a plurality of interconnected, axially aligned segmented housing subassemblies, each of which has an internal taper, a plurality of spherical members spaced along a tension member and adapted to coact with the internal housing tapers, a plurality of axially extending flexible strips connected to the housing segments, and an actuator connected to the spherical members and the housings to move the spherical members into the internal housing tapers to expand the housings into pipe supporting position within a pipe to be bent. Suitable wheels are provided for moving the mandrel into, through and out of the pipe.

REFERENCES:
patent: 856896 (1907-06-01), McCormick
patent: 2380344 (1945-07-01), Sutton
patent: 2734120 (1956-02-01), Sensenig
patent: 2734749 (1956-02-01), Benjamin
patent: 2835498 (1958-05-01), Howes
patent: 3115798 (1963-12-01), Donaway
patent: 3117797 (1964-01-01), Buck
patent: 3383723 (1968-05-01), Connelly
patent: 3747394 (1973-07-01), Cunningham

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