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:
Apr. 25, 2006
Filed:
Apr. 25, 2002
Satoshi Nozaki, Ishioka, JP;
Takashi Abe, Sakai, JP;
Osamu Arai, Takasago, JP;
Kazuhiro Arai, Kobe, JP;
Satoshi Nozaki, Ishioka, JP;
Takashi Abe, Sakai, JP;
Osamu Arai, Takasago, JP;
Kazuhiro Arai, Kobe, JP;
Hitachi Construction Co., Ltd., Tokyo, JP;
Abstract
Locking elementsandare provided at an inner memberconnected to a kelly bar, and a locking element bearing plateis provided at an outer member. The outer memberincludes a cylindrical bucketand a grab buckethoused inside the cylindrical bucket. When an excavating toolis in its most contracted state, the inner memberis rotated forward to lock the locking elementsandat the locking element bearing plate, thereby disallowing relative vertical movement of the inner memberand the outer member. As the excavating tool is rotated by applying a force to the kelly baralong the lifting direction in this state, an excavating operation can be executed while applying a load smaller than the load of the excavating tool
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile