Fluid pressure actuated switch for fluid pump

Details Fluid pressure actuated switch for fluid pump Fluid pressure actuated switch for fluid pump

1991-10-21

1993-02-16

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Piston

73745, 200820, H01H 3538

Patent

active

051873370

ABSTRACT:
A pressure switch for operating a device for increasing the engine speed of an automotive vehicle equipped with a power steering system in order to prevent an engine stall when a high load acts on a power steering pump during parking and at a low vehicle cruising speed. The pressure switch is comprised of a movable terminal which is normally separate from a stationary terminal and contactable with the stationary terminal in response to an oil pressure over a predetermined level, in a hydraulic circuit of the power steering system. The movable terminal is slidably fitted in a pit to be filled with oil so that the response of the movable terminal to the oil pressure is lowered, thus providing a hysteresis effect to prevent chattering of the pressure switch.

REFERENCES:
patent: 2742544 (1956-04-01), Lovick
patent: 4272659 (1981-06-01), Orzel
patent: 4932841 (1990-06-01), Havemann
patent: 4990886 (1991-02-01), Stanolis

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