Electricity: circuit makers and breakers – Fluid pressure – Piston
Patent
1974-08-09
1976-03-02
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Piston
200276, 340239F, H01H 3538
Patent
active
039419584
ABSTRACT:
A fluid filter system includes housing means, including a housing body and a terminal fixed thereto, a filter element and a bypass associated with the housing body, a piston movable in first and second directions relative to the housing body and resilient means for urging the piston in the first direction. The piston is also movable in the second direction against the resilience of the resilient means. The piston is movable in the first direction to a position directing fluid through the filter element, and movable in the second direction upon buildup of fluid pressure thereon due to blockage of fluid flow in the filter element, against the resilience of the resilient means, to a position wherein the fluid flow may bypass the filter element. The improvement comprises a helical spring for maintaining an electrically conductive state between the piston and the terminal means upon an initial degree of movement of the piston in its second direction and for breaking the electrically conductive state between the piston and the terminal upon further movement of the piston in the second direction due to further fluid pressure buildup on the piston.
REFERENCES:
patent: 2729339 (1956-01-01), McCoy
patent: 3261953 (1966-07-01), Tilman et al.
patent: 3435165 (1969-03-01), Lombard
patent: 3644915 (1972-02-01), McBurnett
patent: 3725625 (1973-04-01), Pratt
Caterpillar Tractor Co.
Tolin Gerald P.
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