Plate lifting clamp

Details Plate lifting clamp Plate lifting clamp

1988-08-09

1989-12-05

Cherry, Johnny D.

Handling: hand and hoist-line implements

Grapple

Pivoted cam and hook

294104, B66C 148

Patent

active

048848360

ABSTRACT:
The plate lifting clamp of the present invention includes linkage disposed on the clamp with one end of the linkage connected to the lifting shackle and the other end of the linkage connected to a cam rotatably mounted on the clamp. A spring on the linkage causes the cam to rotate against the work piece gripping the work piece between the cam and a swivel pad mounted on the clamp. A further force is applied to the rotation of the cam as the work piece is lifted on the lifting shackle by the hoist. An operating handle is rotatably disposed on the clamp whereby when rotated to the open position, will cause the cam to rotate away from the work piece and open the clamp. A spring biased locking mechanism is provided on the clamp to lock the operating handle into the open position.

REFERENCES:
patent: 126818 (1872-05-01), Lindsay
patent: 2370411 (1945-02-01), Monaco
patent: 2852300 (1958-09-01), Gardner
patent: 3071406 (1963-01-01), Lucker
patent: 3297354 (1967-01-01), Renfroe
patent: 3857600 (1974-12-01), Hasegawa
patent: 3923333 (1975-12-01), Whaley
patent: 4113298 (1978-09-01), Kopp
patent: 4162804 (1979-07-01), Davies

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