B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/68
B60T 17/04 (2006.01) B60T 17/22 (2006.01) H01H 35/38 (2006.01)
Patent
CA 1143764
HYDRAULIC BRAKE WARNING SWITCH ABSTRACT A differential pressure sensing switch for a motor vehicle, has a piston axially slidable in a housing and ex- posed at each end to the pressure in separate brake cir- cuits. 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 di- ameter 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 adja- cent sealing surface.
367187
Dana Corporation
Ridout & Maybee Llp
LandOfFree
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