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:
Sep. 05, 2000
Filed:
Sep. 29, 1998
Applicant:
Inventors:
Ayumu Morita, Hitachi, JP;
Toru Tanimizu, Hitachi, JP;
Toshio Horikoshi, Fujioka, JP;
Yoshiharu Yotsumoto, Tokyo, JP;
Takanori Hashimoto, Tsubata-machi, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Kuze Bellows Kogyosho Co., Ltd., Ishikawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
218135 ; 218118 ;
Abstract
A bellows, of which one end portion is fixed to a movable lever passing through a vessel wall and the other end portion of which is fixed to the vessel wall, has a spring constant at a central portion in an expansion direction which is smaller than that at the end portions in the expansion direction. The bellows damps stress concentration at the end portions and improves the life thereof, without enlarging the size of the bellows. The bellows may be used in a vacuum switch.