Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1983-02-23
1984-10-23
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
303 15, B60T 1374
Patent
active
044784597
ABSTRACT:
An improved trailer braking system for a tractor-trailer configuration is of the type which includes a primary air reservoir on the tractor which supplies an auxiliary air reservoir on the trailer. A pedal brake actuator on the tractor selectively provides control air from the primary air reservoir on the tractor to a relay valve on the trailer which control air causes air from the auxiliary air reservoir to be directed to the brakes on the trailer. The improvement includes a secondary source of control air on the trailer in the form of a control air reservoir having a volume significantly smaller than the volume of the auxiliary air reservoir. The control air reservoir is supplied control air through a first line from the auxiliary air reservoir. A second line from the control air reservoir goes to the relay valve and includes a check valve therein to only allow the control air to be capable of passing from the control air reservoir to the relay valve. A normally open first valve element is in the first line and a normally closed second valve element is in the second line. An electrical solenoid for the first valve element and the second valve element which is actuated by an electrical signal which is produced when control air is provided by the pedal brake actuator closes the first valve element and opens the second valve element to provide control air from the control air reservoir to the control valve prior to control air from the primary air reservoir through the pedal brake actuator.
REFERENCES:
patent: 3482885 (1969-12-01), Campanini
patent: 3497268 (1970-02-01), Dobrikin
patent: 3507542 (1970-04-01), Cannella
Butler Douglas C.
Rockwell International Corporation
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