Fluid-pressure and analogous brake systems – Motorman's valves
Patent
1988-06-22
1989-07-25
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Motorman's valves
188358, 605471, 60548, B60T 1504, B60T 1314
Patent
active
048506559
ABSTRACT:
A hydraulic booster including a power piston, a booster chamber for applying a boost pressure to the power piston, an input rod, an intermediate inlet chamber for introducing a power source pressure thereinto, a valve mechanism provided in a valve chamber of the power piston and a differential pressure regulating valve subjected to a valve opening pressure equal to a sum of a spring pressure and a pressure of the boost chamber and a valve closing pressure equal to a pressure of the intermediate inlet chamber so as to control opening and closing of a communicating path for introducing the power source pressure into the intermediate inlet chamber such that pressure of the intermediate chamber is kept higher than the pressure of the boost chamber by a predetermined value at all times.
REFERENCES:
patent: 2698205 (1954-12-01), Gagen
patent: 2757512 (1956-08-01), Foreman
patent: 2887187 (1959-05-01), Fletcher et al.
patent: 2992533 (1961-07-01), Hodkinson
patent: 3074383 (1963-01-01), Schultz
patent: 3515441 (1970-06-01), Stein
patent: 4181371 (1980-01-01), Adachi
patent: 4284309 (1981-08-01), Hoefer
patent: 4443040 (1984-04-01), Farr
patent: 4444440 (1984-04-01), Farr
patent: 4463561 (1984-09-01), Leiber
patent: 4563043 (1986-01-01), Scheuering
Matsuzaki Yoshiki
Takata Koji
Butler Douglas C.
Sumitomo Electric Industries Ltd.
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