Rapidly extendable jack

Details Rapidly extendable jack Rapidly extendable jack

1988-02-19

1989-06-27

Smith, James G.

Implements or apparatus for applying pushing or pulling force

Vehicle attached jack

Attached to trailer tongue

254424, B01J 3700

Patent

active

048422525

ABSTRACT:
The present invention provides a three-piece telescoping jack that is capable of rapid coarse adjustments in height. The invention comprises first, second and third elongated tubular members that are somewhat nested in a telescoping relationship. The invention further comprises fine adjustment means for holding and adjusting the position of the second member in relation to the first and coarse adjustment means for holding and adjusting the position of the third member in relation to the second. The coarse adjustment means further allow the position of the third member to be rapidly adjusted, either retracted or extended, in relation to the second member. In a preferred embodiment, the fine adjustment means are a threaded nut and bolt. Also in a preferred embodiment, the coarse adjustment means are a pin and a series of holes in the second and third members.

REFERENCES:
patent: 2529292 (1950-11-01), Greenfield
patent: 3595527 (1971-07-01), Douglass
patent: 3709467 (1973-01-01), Mann
patent: 3957249 (1976-05-01), Williams
patent: 4078774 (1978-03-01), Williams
patent: 4221362 (1980-09-01), Van Santen

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