Jack safety device

Details Jack safety device Jack safety device

1995-05-19

1997-04-08

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

B66F 504

Patent

active

056180292

ABSTRACT:
The present invention relates to a jack safety device which may prevent the accident of the object falling down due to the failure of lifting mechanism of the jack, comprising a safety hook, swingingly pivotted on the lifting arm or lever of said holding mechanism, when elevating and decending said holding mechanism may drive said safety hook reciprocally moving forward and backward; and a hook-up portion having tooth shape for said safety hook to hook up, when said safety hook moves forward it may hook up with said tooth shape to limit it from moving backward so that said holding mechanism can not decend to attain the purpose of safety and protection; and a lever for pushing said safety hook to disengage with said hook-up portion in order to let said holding mechanism decending.

REFERENCES:
patent: 1738622 (1929-12-01), Weaver et al.
patent: 2624543 (1953-01-01), Jackson
patent: 4251056 (1981-02-01), Maniglia
patent: 4289299 (1981-09-01), Kameda
patent: 5221073 (1993-06-01), Shockley

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