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:
Sep. 21, 2010
Filed:
Dec. 06, 2004
Junya Kawamoto, Moriyama, JP;
Kazuyoshi Yamada, Kouka, JP;
Yasutaka Tsuruga, Moriyama, JP;
Kenji Itou, Higashioumi, JP;
Junya Kawamoto, Moriyama, JP;
Kazuyoshi Yamada, Kouka, JP;
Yasutaka Tsuruga, Moriyama, JP;
Kenji Itou, Higashioumi, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A swivel joint for a construction machine is mounted to an upper track frame, and a body is rotatable together with a swing structure main frame in an opening through engagement between a stopper projection and a stopper plate. Tubes on the swing structure side are connected to an upper end surface of the body by using fittings in concentrated layout, and tubes on the travel structure side are connected to a lower portion of the spindle by using fittings. The body has thicker wall portions in sidewalls thereof, and a plurality of axial passages communicating with a plurality of circumferential grooves are formed inside the thicker wall portions. The plurality of axial passages are opened at the upper end surface of the body, and the tubes on the swing structure side are connected to the upper end surface of the body in concentrated layout.