Safety lock for a hoisting mechanism that ascends and descends a

Details Safety lock for a hoisting mechanism that ascends and descends a Safety lock for a hoisting mechanism that ascends and descends a

1975-01-14

1976-09-14

Paperner, L. J.

Brakes

Operators

Speed-responsive

254150R, B60T 824

Patent

active

039801616

ABSTRACT:
A novel safety lock that includes an activation device and a latching device, these devices cooperating with the cable that passes through the lock. The activation device includes a guide pulley rotatably fixed to a mounting plate, a spring loaded pressure roller adapted to press the cable into operating engagement therewith, and a series of centrifugally activated arms positioned about the axis of the guide pulley. The latching device includes a lock block fixed to the mounting plate, and a spring loaded lock wheel mounted for eccentric rotation, the lock wheel being adapted to lock the cable against the lock block then activated. A separate release lever pivotally fixed to the mounting plate is spring loaded in one direction, and a separate latch lever pivotally fixed to the mounting plate is spring loaded in an opposite direction, the latch lever having a latch pin adapted to interengage with a seat defined by the release lever when the safety lock is in the set or unactivated position. Also, the latch pin interengages a seat in the lock wheel to retain same in the spring loaded or unactivated attitude. The head of the release arm is disposed relative to the periphery of the centrifugally activated arms such that any outward motion of those arms (e.g., due to centrifugal force induced by a rapid fall of the safety lock down the cable) will cause at least one of the arms to trip the release lever, thereby removing the latch pin from interengagement with the release lever. At this point the spring loaded latch lever removes the latch pin from interengagement with the lock wheel, thereby allowing the lock wheel to rotate and securely grip the cable between the lock wheel and the lock block.

REFERENCES:
patent: 2931466 (1960-04-01), Allenbaugh
patent: 2938707 (1960-05-01), Allenbaugh
patent: 3327811 (1967-06-01), Mastroberte
patent: 3669223 (1972-06-01), Arnold
patent: 3794298 (1974-02-01), Mauldin
patent: 3830346 (1974-08-01), Watts

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