Pipe expanding pliers

Details Pipe expanding pliers Pipe expanding pliers

1991-04-02

1992-02-25

Larson, Lowell A.

Metal deforming

By relatively receding work-engaging tool-faces

Embodying three or more tools

B21D 4102

Patent

active

050902300

ABSTRACT:
A pipe expanding tool comprising a cylindraceous member having a pipe of oppositely disposed openings and an outer collar; a conical-shaped stepped expander having segmental members including a top stepped portion receivable with the collar, an elastic member receivable in the top stepped portion for urging the segmental members together to close longitudinal slits therebetween; an axially movable spreader receivable within the expander for overcoming compression on the top stepped portion exerted by the elastic member to spread the segmental members away from each other; a plunger for movement of the segmental members transversely of a longitudinal axis of the plunger and spreader; and an arm bearing against the plunger to move the spreader into the expander for increasing the outer diameter thereof and for movement in an opposite direction out of the expander so that the elastic material urges the segmental members together to close longitudinal slits for decreasing the outer diameter of the expander.

REFERENCES:
patent: 4735078 (1988-04-01), Wesebaum
patent: 4890472 (1990-01-01), Rothenberger

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