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:
Jan. 08, 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, an inner circumferential 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 (plunger), and an outer circumferential lip portionextended from an outer circumferential side of the base portion toward the cylinder bore bottom portion and having an outer circumferential surface abutting against a seal groove bottom surface. An abutment surfacehaving a protruded end protruded toward the cylinder bore opening portion and abutting against a surface on the cylinder bore opening portion side is provided on a base end surfaceof the base portion, and a contact pressure adjustment surfacewhich is brought into non-contact with an inner circumferential side of the opening-side-surface in a non-operational state is provided at a position closer to the inner circumference than the abutment surface.