Self-powered bar clamp

Details Self-powered bar clamp Self-powered bar clamp

1992-10-19

1993-11-30

Watson, Robert C.

Work holders

Operator supported

269166, 269254R, 269221, B25B 100

Patent

active

052658546

ABSTRACT:
A hand tool or clamp, which locks itself to a work-piece to thereby free the hands of the user, includes a fixed jaw secured to one end of a slide bar and a movable jaw mounted to the slide bar for movement therealong toward and away from the fixed jaw. The movable jaw is normally spring-biased toward the fixed jaw by a flat coil spring supported on the fixed jaw and connected at its free end to the movable jaw. The spring is uncoiled as the jaws are pulled apart to receive a work-piece, and when either jaw is released, rewinds and rapidly advances the movable jaw along the slide bar into clamping engagement with the work-piece. Additional clamping pressure is provided by a screw mechanism associated with the movable jaw which cooperates with the slide bar to advance the movable jaw toward the fixed jaw and increase the clamping pressure between them.

REFERENCES:
patent: 427300 (1890-05-01), Carroll
patent: 437403 (1890-09-01), Nacke et al.
patent: 2319377 (1943-05-01), Wallace et al.
patent: 3044512 (1962-07-01), Jones
patent: 3218058 (1965-11-01), Smith
patent: 3245677 (1966-04-01), Hurd et al.
patent: 3331111 (1967-07-01), Carver
patent: 4078781 (1978-03-01), Fraser et al.

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