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. 18, 2008
Filed:
Sep. 09, 2004
Toyohiko Imakita, Kobe, JP;
Aritomo Fukui, Kobe, JP;
Masahiko Okuda, Kobe, JP;
Yoshiaki Nakaya, Kobe, JP;
Toyohiko Imakita, Kobe, JP;
Aritomo Fukui, Kobe, JP;
Masahiko Okuda, Kobe, JP;
Yoshiaki Nakaya, Kobe, JP;
Nabtesco Corporation, Tokyo, JP;
Abstract
A selector valve capable of maintaining a closed position for a while even if an operating force to a valve element () is eliminated when the selector valve () is switched from a closed position (braking state) to an open position. The valve element () of the selector valve () receives an operating force from the outside and a returning force in the opposite direction of the operating force by a valve spring (). Accordingly, the valve element () opens and closes the valve by making the first end () of the valve element () seat on/unseat from a valve seat () on the housing () side according to the presence or absence of the operating force. A first port () and a second port () on both sides of the valve seat () are connected or cut off from each other by the opening and closing. The valve element () is formed in a stepped structure, and receives a force based on a difference in pressure receiving area by the stepped structure which results from the pressure of hydraulic fluid. The force can maintain the closed position of the valve for a while.