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US 4,653,812 AGranted
Truck mounted pneumatic brake control system
AssigneeGeneral Signal Corporation
InventorThomas H. Engle
Life of this patent
Estimating the term…
Abstract
A railway car has a brake control equipment group on each truck for governing the brakes thereof including simplified light weight triple valve and reservoir equipment and a modulation equipment group is disposed between trucks of the car providing normal per car requirements for modulating pressure in the brake pipe that would normally be provided by a conventional ABD valve required for each truck equipment group.
Claims36
A valve for interconnecting a brake pipe, an auxiliary reservoir, an emergency reservoir and a brake cylinder comprising:
- brake pipe, auxiliary reservoir, emergency reservoir, brake cylinder and atmosphere ports;
- first sensing means for sensing the pressure at said brake pipe port;
- second sensing means for sensing the differential pressure between said brake pipe port and auxiliary reservoir port;
- third sensing means for sensing the differential pressure between said auxiliary reservoir port and brake cylinder port;
- first valve means connected to said auxiliary reservoir port, emergency reservoir port and said first and third sensing means, including an I/O port, and having a first position for interconnecting said auxiliary reservoir port and said I/O port and isolating said emergency reservoir port from said I/O port for a first brake pipe port pressure sensed by said first sensing means and a second position for interconnecting said emergency reservoir port and said I/O port and isolating said auxiliary reservoir port from said I/O port for a second brake pipe port pressure sensed by said first sensing means and a first differential pressure sensed by said third sensing means;
- and
- second valve means connected to said first valve means I/O port, said brake cylinder port, said atmosphere port and said second sensing means for isolating said I/O port, said brake cylinder port and said atmosphere port from each other for a first differential pressure sensed by said second sensing means, interconnecting said I/O port and said brake cylinder port and isolating said atmosphere port for a second differential pressure sensed by said second sensing means, and interconnecting said brake cylinder port and said atmosphere port and isolating I/O port for a third differential pressure sensed by said second sensing means.
4 more elements
A valve for interconnecting a brake pipe, an auxiliary reservoir, an emergency reservoir and a brake cylinder comprising:
- brake pipe, auxiliary reservoir, emergency reservoir, brake cylinder and atmosphere ports;
- sensing means connected to said brake pipe port for sensing a service signal, a release signal and an emergency signal pressures on said brake pipe port;
- and
- valve means connected to said brake cylinder port, auxiliary reservoir port, emergency reservoir port and atmosphere port and said sensing means for
- (a) interconnecting said brake cylinder port and auxiliary reservoir port for a service signal sensed by said sensing means;
- (b) interconnecting said brake cylinder port and atmosphere port for a release signal sensed by said sensing means;
- and
- (c) sequentially interconnecting said brake cylinder port and said auxiliary reservoir port, isolating said brake cylinder port from said auxiliary reservoir port and interconnecting said brake cylinder port and said emergency reservoir port for an emergency signal sensed by said sensing means.
5 more elements
A load responsive valve comprising:
- sensing means for sensing the load of a vehicle to which said valve is to be mounted;
- an inlet port;
- an outlet port;
- first means connected between said inlet and outlet ports for providing a predetermined portion of said inlet port pressure to said outlet port;
- second means connected to said sensing means and in parallel with said first means for bypassing said first means for a loaded condition sensed by said sensing means;
- said load responsive valve comprising a dummy reservoir and third means connected to said sensing means, said inlet port and said dummy reservoir for interconnecting said inlet port and said dummy reservoir for an unload condition sensed by said sensing means;
- and
- said second and third means including second and third valves respectively and double acting actuator means connected to said second and third valves and said second means for simultaneously opening said one valve and closing the other valve and vice versa.
5 more elements
A modulating valve to be connected to a brake pipe comprising:
- brake pipe and atmosphere ports;
- a quick service volume;
- a bulb volume;
- a release reservoir;
- sensing means connected to said brake pipe port for sensing a service signal, release signal and an emergency signal pressures on said brake pipe port;
- and
- valve means connected to said brake pipe port, atmosphere port, said quick service volume, bulb volume, said release reservoir and said sensing means for
- (a) filling said quick service volume with fluid from said brake pipe port for a service signal sensed by said sensing means;
- (b) sequentially venting said bulb volume to said atmosphere port and refilling said bulb volume from said brake pipe port as a function of the magnitude of the service signal sensed by said sensing means;
- (c) charging said brake pipe port with fluid from said release reservoir for a release signal sensed by said sensing means.
7 more elements
A brake system for a train having a plurality of cars, each car including at least one truck, said brake system comprising:
- a brake pipe;
- a plurality of brake cylinders, one on each truck;
- a plurality of pairs of auxiliary and emergency reservoirs, one pair for each truck;
- a plurality of triple valve means, one for each truck, connected to said brake pipe, brake cylinder and auxiliary and emergency reservoirs for receiving service application, emergency application and release signals on said brake pipe and providing brake applications to said brake cylinder from said reservoirs and releasing said brake cylinder in response to a respective received signal;
- and
- a plurality of modulating means, less than the number of trucks, connected along said brake pipe for accelerating said signals down said brake pipe.
3 more elements
A brake control system for a train of cars comprising:
- (a) brake pipe means secured to car bodies throughout a train of cars for selectively designating brake application and release signals by the selective charging and discharging of the brake pipe with fluid,
- (b) braking equipment for at least one car of a train of cars selectively responsive to changes of pressure in the brake pipe comprising:
- (1) truck brake control means for at least one truck of each car, having pneumatic control connections to the brake pipe only on the car body, for governing braking of the associated truck, and
- (c) modulation control means, independent of any truck brake control means, having pneumatic control connections to the brake pipe only on the car body, for sensing changes in pressure in the brake pipe and for locally assisting in propogation of such pressure changes through the brake pipe.
1 more element
Dependencies are inferred from the claim text.