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:
Jul. 21, 1998
Filed:
Jan. 13, 1997
Keigo Kato, Aichi-ken, JP;
Masataka Mizuno, Aichi-ken, JP;
Aoyama Seisakusho Co., Ltd., Nagoya, JP;
Abstract
A spool valve includes a shaft having plural small diameter portions formed at intervals along the shaft on a circumferential surface of the shaft. The small diameter portions have linear outer surfaces extending substantially parallel to an axis of the shaft. A collar to be mounted to the shaft has a substantially central hole defining an inner diameter of the collar and through which the shaft is passable for mounting the collar to the shaft. The collar has a length shorter than a length of the small diameter portions of the shaft, and a linear inner surface extending substantially parallel to the axis of the shaft and the linear outer surfaces of the small diameter portions. A pair of circular convex portions are integrally formed on outer circumferential faces of a corresponding one of the small diameter portions. The pair of circular convex portions each have an outer diameter larger than the inner diameter of the collar which is to be mounted to the shaft, and are spaced apart from each other by a distance substantially corresponding to the length of the collar. The collar is arranged between the circular convex portions so that side faces of the circular convex portions are in close contact with opposite side surface portions of the collar in a vicinity of the substantially central hole of the collar.