Safety lock for grab hook

Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device

Patent

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Details

245992, 246009, B66C 136

Patent

active

060194081

ABSTRACT:
An improved safety lock allowing for locking of a chain on a grab hook. The safety lock includes a spring-lock that substantially closes the throat of a grab hook. The spring-lock has a recess that is in axial alignment with a clevis portion of the hook, with a clevis pin retaining them. The spring-lock also includes laterally flared sides to permit quick release by thumb-pressure and rotation by one-quarter turn to open the throat. In one embodiment, the clevis pin has an L-bend and is used to substantially close the throat of the grab hook. The spring hook has flared edges and is placed at the back side of the hook to allow for thumb-pressure to rotate the spring-lock, and the attached clevis pin, one-quarter to open the throat of the hook. A coil spring may be attached between the cotter pin used to restrain the clevis pin and the spring-lock. The safety lock can be used with existing hooks.

REFERENCES:
patent: 234716 (1880-11-01), Moulton
patent: 628619 (1899-07-01), Alwood
patent: 682685 (1901-09-01), Hakemeyer
patent: 832149 (1906-10-01), McKinney
patent: 1519442 (1924-12-01), Deeter
patent: 1769512 (1930-07-01), Hill
patent: 3501817 (1970-03-01), Bambenek et al.
patent: 4464813 (1984-08-01), Bakker et al.
patent: 5127219 (1992-07-01), Herron et al.

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