Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1998-01-16
2000-06-27
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
188112A, B60T 1300
Patent
active
060797924
ABSTRACT:
A trailer braking system including one or more trailer wheel assemblies having conventional hydraulically-actuated shoe or disc brakes; a conventional brake master cylinder mounted on the trailer to provide pressurized hydraulic fluid to the wheel cylinders to actuate the brakes; an electric solenoid mounted on the trailer to drive the piston of the master cylinder, preferably through a force-multiplying lever arm, in response to an electrical braking signal from the towing vehicle; and a controller to generate a braking signal proportional to the amount of braking force desired in the trailer brake. The controller may be connected to, and follow the movement of, an element of the towing vehicle's braking system, such as the brake pedal or the vehicle master cylinder piston rod, or the controller may be manually actuated by an operator. There is a manual parking brake which can maintain the force exerted on the wheel cylinder by the trailer master cylinder when power to the solenoid is shut off. The trailer brake is simple to assemble from readily available components, is inexpensive to provide to a new or existing trailer, and is reliable under adverse conditions of use. Since the trailer-mounted elements have no open electrical contacts, as would be required in a motor actuator, the present brake is especially suited for uses requiring occasional immersion of the wheel assemblies or even the entire trailer, such as on boat trailers.
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patent: 4576417 (1986-03-01), Dobner
Graham Matthew C.
Kessler David D.
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