Thomas Leo Price

US Patent:

53421175, Aug 30, 1994

Filed:

Jun 24, 1993

Appl. No.:

8/082039

Inventors:

Thomas D. Price - Norman OK
James C. Roberts - El Reno OK

International Classification:

B60T 1374

US Classification:

303 3

Abstract:

A brake pulsing apparatus for use in vehicles having vacuum hydraulic, pneumatic or electric brake systems. The brake pulsing apparatus includes a solenoid valve, for vacuum hydraulic and pneumatic brake systems, or a relay, for electric brake systems, mounted in a vacuum, pressurized air or electrical line that transmits a brake signal to a brake assembly of the vehicle when the brake system is engaged, a pendulum and proximity switch that sense deceleration of the vehicle, and a timer relay connected between the proximity switch and the solenoid valve or relay to repetitively close the valve or open contacts of the relay when the brake system is engaged. The pendulum and timer relay are adjustable to adapt the brake pulsing apparatus to the type of vehicle in which the apparatus is used. In vacuum hydraulic or pneumatic systems, the solenoid valve repetitively admits air into the vacuum line or exhausts air from the pressurized air line during vehicle braking and a cup, having an orifice through its closed end, can be mounted in a port of the valve to admit or exhaust air at a controlled rate. A second solenoid valve or relay can be mounted in the brake system of a trailer towed by a tractor and operated by the timer relay to synchronously pulse brakes of the trailer with pulsation of brakes of the tractor.