Implements or apparatus for applying pushing or pulling force – Hoisting truck – Single throw lever
Patent
1986-05-05
1987-10-06
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Hoisting truck
Single throw lever
B66F 504
Patent
active
046977880
ABSTRACT:
In an exemplary embodiment in a two-part jack system which includes a jack stand having a load-bearing member supported from vertically telescoping members, one of which has ratchet teeth and another of which carries a spring-loaded pawl for selectively engaging the ratchet teeth, and a power unit having arms for directly supporting the load-bearing member in order to extend or retract the jack stand, the invention is directed to an automatic release mechanism operable when the power unit is being utilized to retract the jack stand for disengaging the pawl from the ratchet to thereby permit complete retraction of the jack stand in a single movement and comprises: an extension arm on the pawl; a pusher member carried on the power unit for selectively engaging the extension arm so as to cause the pawl to disengage from the ratchet teeth; spring means urging the pusher member towards the extension arm; means coupled to the pusher member for selectively restraining its movement; and restraining means being adapted to be selectively disabled whenever the power unit is utilized for retracting the jack stand.
REFERENCES:
patent: 2852229 (1958-09-01), Gross
patent: 3709467 (1973-01-01), Mann
patent: 3834669 (1974-09-01), Reid
patent: 4066243 (1978-01-01), Johnson
patent: 4251056 (1981-02-01), Maniglia
patent: 4289299 (1981-09-01), Kameda
patent: 4462569 (1984-07-01), Arzouman
patent: 4553727 (1985-11-01), Arzouman
patent: 4589630 (1986-05-01), Arzouman
Arant Gene W.
Jodziewicz Matthew F.
Safe-T-Jack, Inc.
Watson Robert C.
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