Screw-type lifting clamp

Details Screw-type lifting clamp Screw-type lifting clamp

1977-02-03

1980-01-15

Dorner, Kenneth J.

Handling: hand and hoist-line implements

Grapple

Pivoted cam and hook

24243B, 269271, 269279, 294103R, B66C 144

Patent

active

041835719

ABSTRACT:
A screw-type lifting clamp comprising a generally U-shaped clamp body having a pair of spaced, opposed projections defining a generally vertically downwardly facing material receiving slot, a lifting shackle attached to said clamp body, a screw threadedly received through a first such body projection and being threadedly movable toward and away from the second body projection, a jaw pivotally mounted to the second body projection for pivotable movement about a horizontal axis perpendicular to the screw axis, and resilient means urging the jaw to a horizontal position. The pivotable jaw includes vertically spaced teeth defining a gripping surface which is convex in a vertical plane and has a radius of curvature greater than the horizontal distance between the jaw pivotal axis and the jaw gripping surface when that jaw is horizontal.

REFERENCES:
patent: 2792731 (1957-05-01), Turner
patent: 3120046 (1964-02-01), Olsen
patent: 3178219 (1965-04-01), Renfroe
patent: 3269766 (1966-08-01), Gardner
patent: 3403901 (1968-10-01), Servadio
patent: 3947011 (1976-03-01), Tsuyama

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