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:
Feb. 16, 2016
Filed:
Apr. 28, 2011
Hideki Akita, Tsuchiura, JP;
Shigeyuki Sakurai, Tsukuba, JP;
Yuuji Igawa, Omitama, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A floating seal () is provided between a mounting bracket () fixed to a side frame () and a roller () rotatable with respect to this mounting bracket (), and lubricant oil (L) collected in the roller () is sealed by this floating seal (). On the other hand, an air permeable plug () provided with an air permeable member () made of a porous material of interconnected cells is provided on a lid member () of the roller (), air and/or water vapor is made to flow between the inside and the outside of the roller () and flow of lubricant oil (L) and/or rainwater and dusts is prevented by the air permeable member () of the air permeable plug (). As a result, the pressure of the inside and the pressure of the outside of the roller () can be made equal all the time.