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:
Oct. 27, 1987
Filed:
Jun. 09, 1986
Andre Tobiasz, Epinay-sur-Seine, FR;
Automotive Products plc, Leamington Spa, GB;
Abstract
A vehicle brake pressure proportioning valve in which a stepped plunger in a stepped bore shuttles in first and second opposite directions when inlet hydraulic pressure from a master cylinder increases to a predetermined value. The aforesaid shuttling causes a ball valve, in which the ball is loaded by a spring, to close and open a bore through the plunger leading to an outlet to the brake so that during the shuttling the outlet brake pressure increases at a lower rate than the inlet pressure. Eventually the increasing inlet pressure attains another predetermined value sufficient to hold the ball valve closed against the spring loading so that the ball blocks the bore no matter which direction the plunger moves and thus the brake pressure cannot be increased any further.