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:
Dec. 03, 2013
Filed:
Mar. 26, 2009
Hideki Akita, Tsuchiura, JP;
Osamu Gokita, Tsukuba, JP;
Akiko Sato, Tsuchiura, JP;
Eiji Negoro, Gojo, JP;
Tomiyoshi Yamazaki, Shinshiro, JP;
Hideki Akita, Tsuchiura, JP;
Osamu Gokita, Tsukuba, JP;
Akiko Sato, Tsuchiura, JP;
Eiji Negoro, Gojo, JP;
Tomiyoshi Yamazaki, Shinshiro, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Nippon Valqua Industries, Ltd., Tokyo, JP;
Abstract
A dust seal is provided with a tubular fitting portion, a bush end surface abutting portion, a lip portion and a sealing projection integrally formed. The sealing projection is formed to project in an axially opposite direction to the lip portion from a radial inner section of the bush end surface abutting portion and abuts against a chamfered portion of a bush in such a manner as to overlap the chamfered portion. Therefore, at the time of supplying lubricant between the bush and a connecting pin, the sealing projection can prevent a part of the lubricant from entering between an end surface of the bush and the bush end surface abutting portion of the dust seal to maintain a sealed state therebetween. In consequence, the dust seal can be stably held on the inner peripheral side of a boss member, preventing the pulling-out of the dust seal.