Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1988-09-16
1990-01-23
Smith, Gary L.
Machine element or mechanism
Control lever and linkage systems
Elements
74523, 267155, 60477, 16305, 16306, 254DIG3, 254813, 254 8B, F16H 2144
Patent
active
048950424
ABSTRACT:
A pump lever for a jack is disclosed which comprises a protrusion formed near a plunger of a fluid pump for the jack; a handle sleeve having a first end and a second end, the first end being adapted to receive a handle and the second end being pivotally joined at said protrusion by a first pin, and in addition, a certain position between the first and second ends of the handle sleeve being pivotally joined with the plunger by a second pin; and a torsion spring having a pair of counteraction portions and a loop portion shaped between said pair of counteraction portions, the loop portion being passed through and supported by the first pin, and the pair of counteraction portions being adapted to respectively make contact with the protrusion and the second pin so that the torsion spring will urge the handle sleeve to raise to its uppermost position when one frees the handle, the top end of which is received in the first end of the handle sleeve at a lowered position.
REFERENCES:
patent: 2235984 (1941-03-01), Devereaux
patent: 2538372 (1951-01-01), Light
patent: 3701211 (1972-10-01), Best
patent: 3907252 (1975-09-01), Gaarder
patent: 4307626 (1981-12-01), Sanada
patent: 4635902 (1987-01-01), Chou
patent: 4656879 (1987-04-01), Jen
Saether F.
Smith Gary L.
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