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US 4,226,481 AGranted
Spring-loaded brake device for railway vehicles
AssigneeKnorr-Bremse GmbH
InventorsHans Pollinger, Paul Lohmeier
Life of this patent
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AssigneeKnorr-Bremse GmbH
InventorsHans Pollinger, Paul Lohmeier
Estimating the term…
A spring-loaded brake device particularly for railway vehicles has a brake valve to control the pressure in a brake line and spring-loaded brake cylinders that can be subjected to the action of pressure in the brake line against the force of a loading spring. At least one venting valve is connected to the brake line and the venting valve comprises a rapid acting valve which is controlled by pressure in the brake line to open a venting passage from the brake line to the atmosphere only when the pressure in the brake line is lowered from a brake release level to a level at which the brake cylinder makes braking contact. This venting passage is otherwise closed. The rapid acting valve thus removes air under pressure from the spring-loaded brake cylinders and flows this air to the atmosphere only at the beginning of a braking operation. Upon further application of the brakes the rapid acting valve has no effect and brake pressure is controlled by the brake valve.
A venting valve for a spring-loaded brake device particularly in a railway vehicle and connected to a brake line to which is further connected a spring-loaded brake cylinder and a brake valve to control pressure in the brake line, said venting valve comprising means in said venting valve for opening a passage from the brake line to the atmosphere only when the pressure in the brake line is decreased from a brake release level to a level at which the brake cylinder effects contact between braking surfaces but before a braking force is applied, said passage being otherwise closed at the brake release level and after contact of the braking surfaces is effected such that the brakes are applied with a force proportional to the decrease in the brake line pressure and the venting valve exerts no influence in any subsequent control of the braking action.
Dependencies are inferred from the claim text.