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:
Jul. 28, 2009
Filed:
Apr. 24, 2007
Hitoshi Kurotsu, Akashi, JP;
Osamu Todo, Akashi, JP;
Kazuyuki Miyazaki, Akashi, JP;
Kobelco Cranes Co., Ltd., Tokyo, JP;
Abstract
A boom hoisting device comprising a mast having a pivotable front end portion connected to a front end portion of a boom through a guy line, a mast-side spreader provided at the front end portion of the mast, a frame-side spreader removably mounted to an upper rotating body and with a hoisting rope being stretched between and spread on both mast-side spreader and frame-side spreader, and a hoisting winch adapted to unwind and wind the hoisting rope to raise and lower the mast and the boom, the hoisting winch being mounted to the mast so that the mast and the hoisting winch are together removed from the upper rotating body by separation of a base end portion of the mast from the upper rotating body.