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:
Mar. 21, 1989
Filed:
Aug. 17, 1987
Ivan Mortimer, West Midlands, GB;
Glyn P Farr, Warwick, GB;
Lucas Industries, Birmingham, GB;
Abstract
A pneumatically operated servo booster has a housing divided by a diaphragm assembly into front and rear chambers respectively. A hub movable with the partition carries a vacuum valve seat and a plunger slidable within the hub carries an atmospheric valve seat, the seats co-operating with a spring-urged poppet valve to control fluid flow to the chamber. A stack of Belleville washers normally transmits input force from an input rod, the washers yielding at a predetermined input force to allow a cup member to engage an abutment carried by the hub, causing the hub to move relative to the valve member and temporarily open the valve seat to cause a reduction in boost compensating for the excess input force.