Hydraulic brake warning switch

Details Hydraulic brake warning switch Hydraulic brake warning switch

1979-12-21

1981-06-09

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Piston

303 6C, 340 52C, H01H 3538

Patent

active

042726590

ABSTRACT:
A differential pressure sensing switch for a motor vehicle has a piston axially slidable in a housing and exposed at each end to the pressure in separate brake circuits. At one end, the piston has a smaller diameter exposed to fluid pressure than at the other end and a sleeve and seal are slidable on said smaller diameter to have a combined diameter greater than that of the other end. A spring biases the sleeve toward the one end so that on cycling, the piston moves first in one direction and then in the other direction to provide positive movement between each seal and its adjacent sealing surface.

REFERENCES:
patent: 3672728 (1972-06-01), Keady
patent: 3832007 (1974-08-01), Thrush

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