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:
Aug. 17, 2004
Filed:
Apr. 18, 2002
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A spool valve includes a sleeve and a spool. The sleeve has a first communicating hole opening into the cylinder bore and a second communicating hole opening into the cylinder bore and separated from the first communicating hole in the axial direction of the cylinder bore. The spool is fluidtightly accommodated in the cylinder bore to slide and has one end portion which opens and closes the first communicating hole upon sliding operation thereof and the another end portion which opens and closes the second communicating hole upon sliding operation thereof. At least one of the end portions has an end surface extending from the outer circumference approximately at a right angle to the spool axis and an inclined surface which progressively decreases a diameter of the spool from the end surface.