Hoisting apparatus having improved clamping means

Details Hoisting apparatus having improved clamping means Hoisting apparatus having improved clamping means

1977-07-22

1979-01-09

Cherry, Johnny D.

Handling: hand and hoist-line implements

Grapple

Pivoted jaws

B66C 142

Patent

active

041335708

ABSTRACT:
A hoisting apparatus includes a hoisting shank slidably engaged with a yoke, the yoke having parallelogram linkages which carry a pair of gripping jaws. The shank is connected with the jaws to spread them apart as the shank moves downwardly with respect to the yoke, and is provided with locking mechanism normally connecting the shank directly to the yoke. A work-engaging mechanism automatically releases the locking mechanism and allows the shank to shift upwardly with respect to the yoke and cause the jaws to grip a load.

REFERENCES:
patent: 1510176 (1924-09-01), Knight
patent: 1673237 (1928-06-01), Gerdes
patent: 2215844 (1940-09-01), Van Syckle
patent: 3488080 (1970-01-01), Hamilton
patent: 3719300 (1973-03-01), Siegmund
patent: 3790204 (1974-02-01), Lighthipe et al.

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