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. 07, 1978
Filed:
Nov. 10, 1975
Eric C Hales, Leamington Spa, EN;
Automotive Products Limited, Warwickshire, EN;
Abstract
A valve device for use in split liquid pressure vehicle braking systems to control rear brake pressure comprises a plunger assembly in a cavity in a housing, the cavity being closed at one end. The plunger assembly has a central land between two smaller end lands. The central land slides within a central portion of the cavity which is between two smaller portions of that cavity. The central portion and the closed end portion of the cavity are formed in a main valve body and the other cavity portion is formed in another body which is carried by the main valve body. The plunger assembly carries a bar which co-operates with the shoulder between the central portion and the closed end portion of the cavity and with a valve unseating pin to unseat a ball in a passage through the central land. A biasing spring urges the plunger assembly towards the closed end of the cavity against the action upon the plunger assembly of front brake pressure which acts between the plunger assembly and the closed end of the cavity. Liquid pressure is transmitted from the master cylinder to the rear brake operating motor cylinders through those parts of the central cavity portion on either side of the central land when the ball is unseated and not when the ball is seated.