Fluid-pressure and analogous brake systems – Motorman's valves – Equalizing
Patent
1980-05-13
1982-06-15
Reger, Duane A.
Fluid-pressure and analogous brake systems
Motorman's valves
Equalizing
303 56, B60T 1506
Patent
active
043347134
ABSTRACT:
A hydraulic control system, for at least one hydraulic braking circuit, comprising a control unit, a brake pedal, an assisting hydraulic pressure plant having a fluid pressure source and a reservoir, a distributor valve having a slide fitted movably in the control unit between a rest position, when the braking circuit connects with the reservoir, and an active position, when the braking circuit is pressurized. This slide is urged in one direction by the pedal and in the opposite direction by the pressure in the braking circuit. The slide moves only about a millimeter, and to give the driver a resonable pedal displacement, a first resilient device, in the form of either stepped parallel or in series helical springs or an elastomer block, is disposed between the pedal and slide. To avoid excessive braking except in a real emergency, a second resilient device, either a spring or the elastomer block, is disposed between the pedal and unit and is adapted to be actuated by the pedal for only a fraction of the pedal stroke at its end of travel, to warn the driver that the end of travel is being approached.
REFERENCES:
patent: 2752947 (1956-07-01), Hruska
patent: 3003825 (1981-10-01), Kemble
patent: 3169804 (1965-02-01), Bueler et al.
patent: 3515441 (1970-06-01), Stein
Reger Duane A.
Societe Anonyme Francaise du Ferodo
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