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:
Nov. 16, 2010
Filed:
Feb. 11, 2008
Masaya Shigeta, Nagano, JP;
Naoki Masuda, Nagano, JP;
Masaya Shigeta, Nagano, JP;
Naoki Masuda, Nagano, JP;
Nissin Kogyo Co., Ltd., Nagano, JP;
Abstract
A normally open electromagnetic valve includes a fixed core, a movable core, a coil, a valve body, a valve seat member, a return spring, a raised portion formed at one of the fixed and movable core so as to project towards the other core and a recessed portion formed at the other core so as to face the raised portion. A relationship between the raised and recessed portions is set such that while a distance therebetween is within a predetermined range, an attraction force acting between the fixed core and the movable core by virtue of an excitation force of the coil decreases as the raised portion approaches or moves into the recessed portion, and when the valve body and the valve seat surface are brought into abutment with each other by exiting the coil, the distance between the raised portion and the recessed portion stays within the predetermined range.