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US 5,211,450 AGranted
Empty/load valve
AssigneeKnorr Brake Holding Corporation
InventorsRobert Gayfer, Walter E. Rojecki
Life of this patent
Estimating the term…
Abstract
An empty-load device, having in a single housing, a sensing piston and a ratio piston interconnected by a push rod which senses load. A ratio valve, including a valving element and valve seat, is mounted on and travels with the ratio piston and is opened by the push rod. The ratio valve is connected to the ratio piston by a spring such that the push rod engages the ratio valve to open the ratio valve and position the ratio piston via the spring.
Claims19
An empty-load device including:
- a housing having brake cylinder, control valve and equalizing volume ports;
- sensing means, having a sensing piston, for sensing load force bearing on a railroad car truck;
- ratio means, having a ratio piston and a ratio valve operated by said ratio piston, for limiting fluid pressure at the brake cylinder port from said control valve port;
- equalizing valve for connecting said control valve port and said equalizing volume port;
- a push rod, operatively connected to said sensing piston, said equalizing valve and said ratio means, for selectively controlling fluid pressure at the brake cylinder port in accordance with said sensed load force;
- the improvement comprising:
- said ratio valve including a valving element and a valve seat mounted on and traveling with said ratio piston.
4 more elements
An empty-load device including;
- a housing having a brake cylinder, control valve and equalizing volume ports;
- sensing means having a sensing piston for sensing load force bearing on a railroad car truck;
- ratio means having a ratio piston and a ratio valve operated by said ratio piston for limiting fluid pressure at the brake cylinder port from said control valve port;
- equalizing valve for connecting said control valve port and said equalizing volume port;
- a push rod, operatively connected to said sensing piston, said equalizing valve and said ratio means for selectively controlling fluid pressure at the brake cylinder port in accordance with said sensed load force;
- the improvement comprising:
- said ratio valve is connected to said ratio piston by a spring;
- and
- said push rod engages said ratio valve to open said ratio valve and to positions said ratio piston for variations of sensed load force via said spring.
6 more elements
Dependencies are inferred from the claim text.