Brakes – With condition indicator – Electrical
Patent
1989-11-07
1991-07-30
Butler, Douglas C.
Brakes
With condition indicator
Electrical
188 723, F16D 6600
Patent
active
050353039
ABSTRACT:
An excessive wear indicator for a brake system having a fluid actuated linearly moving piston which is disposed in an opening of a housing and is associated with at least one moveable brake friction element is disclosed. The brake wear indicator comprises a manually actuated, spring biased plunger pin which is slidably disposed in a bore formed in the housing which extends traversely with respect to the direction of movement of the piston. The plunger pin includes a distal feeler end and an actuator end and is disposed in the bore such that the distal feeler end is disposed adjacent a piston wall portion at least when the piston is in its brake actuating position for so long as excessive piston travel associated with excessive brake wear is absent and the actuator end extends outside the housing. Manual manipulation of the actuator end of the plunger pin from outside the housing against the bias of the spring provides an indication of piston travel and excessive brake wear by the feeler end cooperating with the piston wall portion to sense excessive piston travel associated with excessive brake wear.
REFERENCES:
patent: 3018852 (1962-01-01), Stanton
patent: 3055456 (1962-09-01), Pfeiffer
patent: 3533491 (1970-10-01), Svenson
Butler Douglas C.
Rockwell International Corporation
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