Work holders – Relatively movable jaws – Three coacting work grippers
Patent
1980-08-26
1982-04-27
Watson, Robert C.
Work holders
Relatively movable jaws
Three coacting work grippers
269239, 269209, 269211, 269254CS, 269287, 248523, B25B 100
Patent
active
043267033
ABSTRACT:
A generally rectangular frame is provided for disposition on a horizontal surface and first and second adjacent sides of the frame define convergent gripping jaws and a horizontally opening crotch at the convergent ends of the jaws for frictionally gripping adjacent peripherally spaced surfaces of a log section. An elongated third jaw is provided and pivot structure releasably pivotally attaches one end of the third jaw to selected points spaced along the first jaw for swinging of the other end of the third jaw toward and away from the end portion of the second jaw remote from the first jaw. Biasing structure is operatively connected between the third jaw and the frame and yieldably biases the third jaw to swing in a direction toward the second jaw. The side of the third jaw facing the first and second jaws as well as the sides of the first and second jaws facing the third jaw are provided with longitudinally spaced teeth and the biasing structure operatively connected between the third jaw and the frame includes an elongated tension member yieldingly attached at one end to one of the third and second jaws remote from the first jaw and the other end thereof releasably anchorable, at points spaced therealong, to the other of said second and third jaws.
REFERENCES:
patent: 1198365 (1916-09-01), Manney
patent: 1540856 (1925-06-01), Munro
patent: 1619749 (1927-03-01), Murray
patent: 2221923 (1940-11-01), Passaver
patent: 2639877 (1953-05-01), Fox
patent: 3480241 (1969-11-01), Moyer
patent: 4239198 (1980-12-01), Trupp
Jacobson Harvey B.
Watson Robert C.
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