Park brake interlock and trailer brake valve assembly

Details Park brake interlock and trailer brake valve assembly Park brake interlock and trailer brake valve assembly

2007-04-17

2007-04-17

Siconolfi, Robert A. (Department: 3683)

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

C303S015000

Reexamination Certificate

active

10962956

ABSTRACT:
A brake system for a tractor-trailer vehicle includes a service brake system and a park brake system. The service and park brake systems are used to brake both a tractor and a trailer towed by the tractor. A trailer hand control valve is actuated by a vehicle operator to brake the trailer. The park brake system includes a park brake control valve that receives input commands from the vehicle operator to apply and release park brakes on the tractor and the trailer. An interlock valve assembly fluidly connects the park brake control valve to primary and secondary air supplies. The trailer hand control valve is also fluidly connected to the interlock valve assembly. The interlock valve assembly includes an outlet port that supplies an air signal to the trailer from one of the primary air source, secondary air source, or trailer hand control valve via a single connection line.

REFERENCES:
patent: 4018485 (1977-04-01), Fannin
patent: 4230373 (1980-10-01), Plantan
patent: 4232908 (1980-11-01), Stearns
patent: 4261624 (1981-04-01), Plantan
patent: 4605262 (1986-08-01), Bartholomew
patent: 4657311 (1987-04-01), Fannin
patent: 4673222 (1987-06-01), Knight
patent: 5046786 (1991-09-01), Johnston et al.
patent: 5226692 (1993-07-01), Eberling
patent: 6729696 (2004-05-01), Kemer et al.
patent: 2002/0167219 (2002-11-01), Kemer et al.

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