The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 07, 1979
Filed:
Dec. 08, 1977
Henri Limozin, Claye Souilly, FR;
Georges Dalibout, Gagny, FR;
WABCO Westinghouse, Freinville-Sevran, FR;
Abstract
A brake cylinder fluid pressure distributor having a control valve device of the pressure proportioning type that includes a main and auxiliary reaction piston, each subject on a corresponding face to pressure delivered by the control valve device to the brake cylinders in order to provide an actuating force on the piston valve assembly in a counteracting direction to the control force thereon, thereby automatically regulating the brake cylinder pressure. The auxiliary reacting piston is arranged on the piston valve assembly so as to be either engaged therewith or disengaged therefrom according to the effective load condition, speed range, deceleration rate or other parameter of a vehicle to be braked, thereby adjusting the effective brake cylinder pressure by adjusting the point in time when the delivery of pressure to the brake cylinders is terminated by the regulating action of the control valve device. Additional improvements include a segmented differential control piston via which the control force is transmitted to the piston assembly according to the variation of brake pipe pressure acting on one side of the control piston in opposition to a constant reference pressure on the other side. When the control force differential exceeds a predetermined level, corresponding to an emergency brake application, for example, one member of the segmented control piston is withheld from engagement with the other member such that only the reference pressure acts on the control piston to provide a constant control force on the piston assembly.