1994-10-28
1995-11-14
Butler, Douglas C.
Brakes
Vehicle
Train
188112R, 188170, 303 7, 303 976, 303 49, 303 71, B60T 702
Patent
active
054658136
ABSTRACT:
A device for applying the brake of a towed vehicle when towed by a towing vehicle equipped with an air brake system having a power brake operator operative to supply operating air under pressure to apply a brake on the towing vehicle and also having a reservoir of operating air under pressure. The device is connected to the brake pedal of the towed vehicle. It comprises a first piston-cylinder assembly with a spring for urging the piston therein to an advanced position, and a second piston-cylinder assembly having a spring urging the piston therein to a retracted position. The brake on the towed vehicle is applied only when one of the pistons is advanced. An air line supplies air from the reservoir to the first piston-cylinder assembly to urge the piston to a retracted position against the action of the spring. The brake of the towed vehicle is applied when the piston in the first piston-cylinder assembly is moved to an advanced position by the spring therein in response to a loss of pressure in the reservoir. The brake of the towed vehicle is also applied when the piston in the second piston-cylinder assembly is moved against the spring force to its advanced position by operating air under pressure from the power brake operator when the power brake operator applies the brakes of the towing vehicle.
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ATC Leasing Company
Butler Douglas C.
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