Title: Valve for controlling pressure medium actuated brakes for railway and other vehicles

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Claims: What is claimed is:

1. A control valve for pressure medium actuated brakes for a railway or other vehicle and comprising a multi-stage axially displaceable stepped piston valve member having a plurality of annular radial surfaces thereon with a predetermined surface area ratio to one another, a double valve connected between a supply of pressure medium, a vent and a brake and operable by said piston valve member so that the pressure medium at the brake is controlled in response to the position of said double valve, a plurality of control valves selectively operable to subject said radial surfaces individually or in combination to said pressure medium at the brake in response to a selected pressure stage, and thereby exerting an axial force upon said piston valve member directed to open said vent via said double valve, and spring means acting upon said piston valve member for applying an axial force against said piston valve member independently of the pressure medium at the brake and in opposition to the force exerted by the pressure medium against said radial surfaces and directed to open a connection from said supply of pressure medium via said double valve to said pressure medium at the brake, such that said applied force and the force by said pressure medium are constant and balance each other at all stages of braking, said piston valve member has a radial surface opposed to said plurality of radial surfaces and said axial force applying means acts upon said opposed radial surface.

2. A control valve as claimed in claim 1 wherein said axial force applying means comprises a fluid pressure cylinder.

3. A control valve as claimed in claim 1 wherein said axial force applying means is adjustable.

4. A control valve as claimed in claim 1 wherein the force applied by said axial force applying means is proportional to the load on the vehicle.

5. A control valve as claimed in claim 1 and means for applying a control force to said opposed radial surface.

Other info:

Inventors: Hefter, Erik (Germering, DT)
Pollinger, Hans (Munich, DT)

Application Number: 521910
Filing Date: 1974-11-07
Publication_date: 1976-04-06
Assignee: Knorr-Bremse GmbH (Munich, DT)
Primary Class(es): 303/22.7 303/15
Other Classes:
US Patent Ref:

3068050	Dec, 1962	Pekrul	303/22.
3228731	Jan, 1966	Valentine	303/22.
3517971	Jun, 1970	Scott	303/22.
3685868	Aug, 1972	Nagase et al.	303/22.
3761142	Sep, 1973	Williams et al.	303/22.
3799623	Mar, 1974	Wickham et al.	303/15.
3823984	Jul, 1974	Parfitt et al.	303/3.

Other Refs: 254,1141,234,381436,375444,802948,551800,683

Feb, 1963	AU
Oct, 1960	FR
Oct, 1926	DT
Feb, 1949	IT
Aug, 1949	FR
Nov, 1950	DT

Primary Examiner: Blix, Trygve M.
Assistant Examiner: Butler, Douglas C.
Attorney: Jaskiewicz; Edmund M.