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:
Dec. 19, 2000
Filed:
Nov. 18, 1998
Toshiyuki Suwa, Nagano, JP;
Nissin Kogyo Co., Ltd., Nagano, JP;
Abstract
A negative pressure booster equipped with an electromagnetic auxiliary control means can introduce air into an operation chamber in correspondence with normal braking and urgent braking by a single valve element which is simple in structure and provides good response. A valve element is supported for to-and-fro movement within a prescribed stroke in the input member and spring-biased to the side of the retraction limit. A solenoid and fixed core of an electromagnetic auxiliary control means is fixed to the valve cylinder coupled with booster pistons. A movable core opposite to the fixed core is coupled with the valve element. When the solenoid is excited while the input member advances, the movable core is operated so that the advancement quantity (communication opening degree between the operation chambers and air) of the valve element for the valve cylinder exceeds that of the valve element operated by the input member.