Device for monitoring a hydraulic brake system for vehicles

Details Device for monitoring a hydraulic brake system for vehicles Device for monitoring a hydraulic brake system for vehicles

1985-12-09

1987-03-31

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Motorman's valves

60545, 188 111, 303 92, 303100, 303114, 303119, B60T 1116, B60T 1722, B60T 802

Patent

active

046538135

ABSTRACT:
A brake system wherein the piston (2) of a master cylinder (1) is actuated by the pressure controlled by a brake valve (6), a monitoring device is provided for detection of fail conditions. The monitoring device comprises a switch (18) which is closed by a trip cam (17) upon an actuating distance (s.sub.1) having been traveled by the actuating element (4), and further switches (20, 21), the switch (20) being closed after an actuating travel distance (s.sub.21) and the switch (21) being closed after an actuating travel distance (s.sub.22), each by a trip cam (19) at the master cylinder piston (2). If the master cylinder piston (2) has not yet traveled the actuating distance (s.sub.21) or has already traveled furher than the distance (s.sub.22) when the switch (18) closes, an evaluating circuit (22) which evaluates the positions of the switches (18, 20, 21) will switch on a signal lamp (23) to indicate a fail condition in the brake system.

REFERENCES:
patent: 4346942 (1982-08-01), Leiber
patent: 4357055 (1982-11-01), Leiber et al.
patent: 4478461 (1984-10-01), Leiber
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patent: 4534171 (1985-08-01), Leiber
patent: 4550954 (1985-11-01), Leiber
patent: 4557528 (1985-12-01), Leiber
patent: 4568130 (1986-02-01), Leiber
patent: 4580847 (1986-04-01), Burgdorf

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