Tube bending machine

Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path

Reexamination Certificate

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Details

C072S389100, C072S389300

Reexamination Certificate

active

07000447

ABSTRACT:
A machine for bending thin wall electrical conduit having first and second spaced apart forming shoes, each having partial arcuate forming surfaces and a movable arcuate shaped third forming shoe mounted on the tabletop between the first and second forming shoes connected to an actuator for lineal movement forcing a section of tubing against the first and second forming surfaces with quick release retention wheels mounted on a flat plate in a cavity in the tabletop, the cavity having a load-supporting vertical edge for supporting the retention members under load and a pocket on the opposite side from the load supporting edge receiving an edge of the plate preventing it from lifting out of the cavity under load.

REFERENCES:
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patent: 4569219 (1986-02-01), Threlkel et al.
patent: 5027633 (1991-07-01), Smith
patent: 5237847 (1993-08-01), Owens
patent: 5528921 (1996-06-01), Herman
patent: 5615572 (1997-04-01), Johnson et al.
patent: 5761950 (1998-06-01), Chiu
patent: 485636 (1929-11-01), None
patent: 1188685 (1959-09-01), None
patent: 1444385 (1976-07-01), None

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