Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1975-01-16
1976-02-10
Blunk, Evon C.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
24241PP, 24241SB, 24242, B66C 136
Patent
active
RE0287091
ABSTRACT:
A hoisting hook carries an end loop of a load bearing line and has an eye, a curved hook with a hook tip spaced from the eye to form a throat therebetween, and a throat closure device in the form of a safety gate pivotally mounted for rotation about the eye of the hook. The gate has a bridging arm portion which, in closed relation, extends from the eye of the hook to the [top] tip of the hook across the hook throat and a connecting arm portion which extends upwardly from the eye of the hook to provide a gate eye to receive a hoisting line. When the end loop of the load bearing line is on the hook and the hook and gate combination is loaded, the load on the hook will tend to cause the bridging arm portion of the gate to close on the tip of the hook and to remain in a closed position. A self-locking latch is pivotally mounted entirely within the gate for movement between locking and release positions. The configuration of the bridging arm portion is such that it is extremely unlikely or impossible for the load line end loop to move off of encircling relation to the hook whether the load line is slack or loaded and when the hook is bridged. The safety gate can be rotated clear of the hook throat to provide virtually the entire throat dimension for receiving the edge of flat sheet or plate material or the like.
REFERENCES:
patent: 457524 (1891-08-01), Bucknam
patent: 1390023 (1921-09-01), Coon
patent: 1956786 (1934-05-01), Bemis
patent: 2857644 (1958-10-01), Gale
patent: 2864644 (1958-12-01), Marryatt
patent: 2927358 (1960-03-01), Ratcliff
patent: 3453822 (1969-07-01), Crook, Jr.
American Hoist & Derrick Company
Blunk Evon C.
Cherry Johnny D.
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