Extendible jack stand

Details Extendible jack stand Extendible jack stand

1990-04-02

1992-05-05

Hartman, J. J.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

254102, 254108, B66F 504

Patent

active

051100894

ABSTRACT:
An extendible jacking apparatus including first, second and third normally vertical frames arranged in telescoping relationship, and containing a locking mechanism for automatically locking the first and second frames together while the third frame is being raised, locking the second and third frames together when the third frame is fully raised, and unlocking the first and second frames to allow extension of the second frame. Conversely, the locking mechanism is automatically reversible as the jack is lowered, unlocking the second and third frames and relocking the first and second frames upon the second frame being fully retracted into the first, allowing the third frame to allow be fully retracted into the first and second frames.

REFERENCES:
patent: 1088953 (1914-03-01), Willet
patent: 1333645 (1920-03-01), Walker
patent: 4462569 (1984-07-01), Arzouman
patent: 4589630 (1986-05-01), Arzouman
patent: 4641813 (1987-02-01), Arzouman
patent: 4960264 (1990-10-01), Arzouman et al.

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