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:
Oct. 21, 2003
Filed:
Jul. 12, 2002
Genroku Sugiyama, Miho, JP;
Wataru Idetsu, Chiyoda, JP;
Akihiko Yamamoto, Chiyoda, JP;
Yuji Yoshitomi, Chiyoda, JP;
Akiomi Kono, Tomobe, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
Hardened surface layers ( ) and ( ) of a nitride or other compound, which is higher in hardness than dirt or soil, are formed on the inner peripheral surface ( B) of each metal bush ( ) and on the outer peripheral surface ( A) of each connecting pin ( ) which constitute a crawler belt ( ), respectively. In addition, resinous sliding bearings ( ) are fitted in transversely spaced positions on the inner periphery of each metal bush ( ) of the crawler belt. Bearing ( ) is provided with recessed grooves ( ). Accordingly, part of soil or dirt which intrudes into a gap space between an outer link portion ( ) of a track link and a metal bush ( ) through an annular seal member ( ) is trapped on an inner peripheral surface ( A) of the bearing ( ).