Spring brake units and drainage means therefor
AssigneeClayton Dewandre Company Limited
InventorRalph Coupland
Life of this patent
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Abstract
A spring brake unit for use in a vehicle braking system comprises a housing, a piston movable therein and connected to a brake or brake linkage, a spring interposed between the piston and a detachable end wall on the housing and urging the piston in a direction to apply the brakes fluid under pressure being introduced to the housing in a controlled manner to hold the piston in brake-off position, and the housing and/or detachable end wall being formed to define one or more drainage channels opening into a gaiter which bridges the joint between them and which includes a drain outlet.
Claims6
A spring brake unit for a vehicle braking system comprising a housing member having a detachable end wall member providing an annular joint between said members, a piston axially movable within the housing member and defining a spring chamber between the piston and end wall and a fluid pressure chamber on the opposite side, means on the piston extending through said fluid pressure chamber for connecting said piston to the vehicle brakes, spring means in said spring chamber axially extending between said piston and said end wall, said spring means being compressed and held in energized condition by said piston when there is a predetermined pressure in said fluid pressure chamber and being adapted to expand and displace said piston in the brake applying direction when there is less than said predetermined pressure in said fluid pressure chamber, means providing a gaiter circuferentially surrounding and bridging said joint, means defining at least one moisture drainage port in at least one of said members opening into the gaiter at said joint, and a normally closed drain outlet in said gaiter.
Dependencies are inferred from the claim text.