Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1985-03-01
1987-03-10
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
251321, B60T 842, F16K 100
Patent
active
046486640
ABSTRACT:
In an hydraulic anti-skid braking system of the pump and de-boost type, the de-boost piston is held in an advanced inoperative position by a volume of fluid trapped in a space and supplied by a pump. A bleed device communicating with the space is held in an open position during initial bleeding of the system by a friction device which acts as a stop and which is releasable when the bleed device is subjected to a predetermined pressure. This enables initial bleeding to be carried out automatically and without an operator operation to open and close a bleed device. After initial bleeding, the device can be opened manually to enable subsequent bleeding to be carried out, with the spring assembly acting on the de-boost piston also acting to close the bleed device following release of the manual force.
REFERENCES:
patent: 2417242 (1947-03-01), Eckel
patent: 4264111 (1981-04-01), Shimizu et al.
patent: 4474413 (1984-10-01), Farr
Butler Douglas C.
Lucas Industries Public Limited Company
Oberleitner Robert J.
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