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:
Feb. 02, 1982
Filed:
Jun. 02, 1980
Volker Berisch, Hattersheim, DE;
ITT Industries, Inc., New York, NY (US);
Abstract
The control valve includes a pressure sensing piston disposed in a housing bore having a first active surface exposed to pressure of the front wheel brake circuit and a second active surface exposed to pressure of the rear wheel brake circuit, the second active surface being smaller than the first active surface. A stepped piston having an axial bore therein communicating with the rear wheel brake circuit is also disposed in the housing bore with the smaller diameter portion thereof being axially guided in a bore of the sensing piston. The end of the axial bore of the stepped piston in the bore of the sensing piston provide a valve seat and the sensing piston causes a valve closing member to effect a reduction of pressure in the rear wheel brake circuit when a given brake pressure is achieved. A single spring is disposed relative to the two pistons to bias the two pistons away from each other, to establish the switching point for pressure reduction, and to maintain the valve open should the front wheel brake circuit fail.