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. 11, 1997
Filed:
Oct. 14, 1994
Applicant:
Inventors:
Yoshio Asou, Yawara-mura, JP;
Takumi Matsumoto, Yawara-mura, JP;
Shinichi Yoshimura, Yawara-mura, JP;
Assignee:
SMC Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277152 ; 2771673 ; 2772 / ; 277215 ; 13762566 ; 13762569 ;
Abstract
Provision of constrictions imparts to a sealing ring for spool valves both needing flexibility and sufficient strength to remain undetached from the spool in the spool valves. The constrictions to impart flexibility are provided on the outside of the center of the band width of the sealing ring. The ring is of a greater axial thickness on a radially inner side thereof than at the constrictions so as to be firmly fitted in a groove of the spool.