Empty/load brake control system
AssigneeAmerican Standard Inc.
InventorDaniel G. Scott
Life of this patent
Estimating the term…
Abstract
An empty/load brake control system for a railway freight car comprising a pair of load sensors and a proportional valve to proportion the brake cylinder delivery pressure when an "empty" load condition of the car is sensed. The load sensor valves are piped in series to control the proportioning valve so that both load sensors must detect an "empty" load condition to pilot the proportional valve. In this sense, a false load reading toward an "empty" load condition due to car rocking is prevented from occurring, by mounting the respective load sensors directly opposite each other on different sides of the railway car.
Claims7
An empty/load brake control system for a railway vehicle having sprung and unsprung members comprising:
- (a) a fluid pressure actuated brake cylinder device;
- (b) a brake cylinder pressure control valve device;
- (c) proportional valve means between said control valve device and said brake cylinder device for relaying brake cylinder delivery pressure from said control valve device to said brake cylinder device;
- (d) sensor means for detecting the vehicle load condition, so as to connect the relayed brake cylinder delivery pressure to said proportional valve in parallel with said brake cylinder device in a first load condition of said vehicle and to interrupt said connection of said relayed brake cylinder delivery pressure to said proportional valve in a second load condition of said vehicle;
- (e) said proportional valve means being operative in response to the relayed brake cylinder delivery pressure connected thereto in said first load condition for establishing a lower brake cylinder pressure than in said second load condition;
- and
- (f) said sensor means comprising first and second load sensor valves connected in series such that, said relayed brake cylinder delivery pressure is connected to said proportional valve only when said first load condition is sensed concurrently by both said first and second load sensor valves.
Dependencies are inferred from the claim text.