Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1984-06-29
1985-11-19
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
188195, 303 13, 303 22A, B60T 1300, B60T 818
Patent
active
045537887
ABSTRACT:
The force applied to brake a towed vehicle (18) is varied in response to the load of the vehicle (18). A signal generating device (38) generates a first signal when the load weighs more than a selected value and a second signal when the load weighs less than such value. Pressure reducing circuitry (46) reduces the pressure supplied in opposition to the biasing of the towed vehicle brake valve (34) when the second signal is generated and does not reduce such pressure when the first signal is generated. A manual override (52) serves for manually overriding the pressure reducer (44) when the signal generating device (38) generates the second signal. This supplies substantially unreduced pressure in opposition to the biasing of the towed vehicle brake valve (34). In this manner, towed vehicles (18) are prevented from being overbraked when empty. The operator may override the system as necessary, e.g., when both vehicles are empty.
REFERENCES:
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patent: 3162491 (1964-12-01), Van Winsen
patent: 3210132 (1965-10-01), Alfieri et al.
patent: 3540219 (1970-11-01), Huruta et al.
patent: 3780837 (1973-12-01), Haydu
patent: 4090738 (1978-05-01), Bray
patent: 4092047 (1978-05-01), Amedei et al.
patent: 4289358 (1981-09-01), Dufft et al.
patent: 4348062 (1982-09-01), Koenig
patent: 4368926 (1983-01-01), Bartholomew
patent: 4383717 (1983-05-01), Bueler
patent: 4410218 (1983-10-01), Bueler
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