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:
Sep. 24, 1996
Filed:
Jun. 15, 1994
Nobumaro Osaka, Yamanashi-ken, JP;
Yasuhiko Amari, Yamanashi-ken, JP;
Takanobu Enomoto, Yamanashi-ken, JP;
Tokico Ltd., Kanagawa-ken, JP;
Abstract
A pneumatic booster has a valve member arranged to operate stably even under a large differential pressure. The inside of a housing is divided into a constant-pressure chamber and a variable-pressure chamber by a diaphragm. A plunger and a valve member are disposed in a valve body supported by the diaphragm such that the plunger and the valve member are slidable relative to each other. The valve member is formed from a rigid reinforcing member and an elastic member bonded to the reinforcing member. The plunger is movable in association with an input shaft. The movement of the plunger is transmitted to the valve member through a valve spring, causing the valve member to separate from a seat portion provided on the plunger. Thus, compressed air is introduced into the variable-pressure chamber from a pneumatic device through passages to produce a differential pressure between the variable-pressure chamber and the constant-pressure chamber, which is supplied with a negative pressure from an engine, thereby driving the valve body.