Power plants – Pressure fluid source and motor – Pulsator
Patent
1983-10-24
1985-08-13
Hershkovitz, Abraham
Power plants
Pressure fluid source and motor
Pulsator
60562, 60581, B60T 1120, B60T 1538, B60T 1546
Patent
active
045341729
ABSTRACT:
In a master cylinder assembly comprising two pedal-operated master cylinders, each master cylinder comprises a pedal-operated piston of stepped outline working in a complementary stepped bore in a housing and having an inner end of smaller area carrying a first seal and an outer end of greater area carrying a second seal, a pressure space in the bore in advance of the inner end of the piston, a quick-fill chamber defined in the bore between the inner and outer ends of the piston, a normally-open recuperation valve providing communication between a reservoir for fluid and the pressure space at least when the piston is in a retracted position, and a normally-closed pressure-limiting valve assembly between the quick-fill chamber and the same or a second reservoir. The pressure-limiting valve assembly is adapted to open at a threshold value when the piston is moved in a brake-applying direction and following closure of the recuperation valve and the transfer of fluid to the pressure-space to take up the braking clearances, further movement of the piston in the same direction pressurizes fluid in the pressure space to apply the brake. The two quick-fill chambers are connected through a transfer passage so that fluid can be transferred between the two quick-fill chambers when both master cylinders are operated simultaneously at least until the said threshold value is attained.
REFERENCES:
patent: 2816422 (1957-12-01), Fletcher
patent: 3336597 (1967-08-01), Fay
patent: 4006593 (1977-02-01), Edwards
patent: 4231224 (1980-11-01), Edwards et al.
patent: 4388806 (1983-06-01), Szarka et al.
Gornall Graham J.
Price Anthony G.
Hershkovitz Abraham
Kapsalas George
Lucas Industries Public Limited Company
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