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:
May. 07, 2013
Filed:
Sep. 17, 2009
Mitsuhiro Hanaoka, Nagano, JP;
Mitsuhiro Hanaoka, Nagano, JP;
Nissin Kogyo Co., Ltd., Nagano, JP;
Abstract
A cup sealincludes a base portiondisposed on a cylinder bore opening portion side of a seal groove, and an inner lip portionextended from an inner circumferential side of the base portion toward a cylinder bore bottom portion and having an inner circumferential surface slidably abutting against an outer circumferential surface of a piston. In a state where the cup sealis fitted into the seal groove and a plungeris inserted into a cylinder bore, an abutting force maximum portionwhere an abutting force against the plungerbecomes maximum within an inner circumferential surface of the cup sealis provided on an end portion on the cylinder bore opening portion side of an inner circumferential surface part of the base portion