Automatic load-dependent brake control device having wide range

Details Automatic load-dependent brake control device having wide range Automatic load-dependent brake control device having wide range

1980-06-02

1981-11-10

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

188195, B60T 822

Patent

active

042994284

ABSTRACT:
In a variable load valve device of the type employing a walking beam type lever arrangement via which the control and compensating pistons are interconnected to obtain load-dependent control of the brake pressure, there is provided a screw adjustment that acts through an auxiliary piston to vary the tension of a bias spring acting on one of the levers of the lever arrangement to bias the compensating piston in order to withhold the load-dependent brake control until a predetermined level of brake pressure is developed. The auxiliary piston is subject to brake control pressure supplied to the variable load valve inlet and in one embodiment of the invention, the auxiliary piston is formed to urge the piston in a direction to counteract the spring force and in another embodiment, to urge the piston in a direction to supplement the spring force.

REFERENCES:
patent: 2940796 (1960-06-01), Ortmann et al.
patent: 3583772 (1971-06-01), Reno

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