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:
May. 15, 2007
Filed:
Oct. 19, 2004
Tokihiko Mizuta, Akashi, JP;
Osamu Toudou, Akashi, JP;
Keisuke Fukumoto, Akashi, JP;
Eiji Miya, Akashi, JP;
Yasuhiko Murayama, Akashi, JP;
Tokihiko Mizuta, Akashi, JP;
Osamu Toudou, Akashi, JP;
Keisuke Fukumoto, Akashi, JP;
Eiji Miya, Akashi, JP;
Yasuhiko Murayama, Akashi, JP;
Kobelco Cranes Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a crane where a spreader retainer is disposed on a rear surface of an extreme end of the lowest boom portion used both for a tower boom and a normal boom, a distance between an upper spreader, which constitutes a boom raising/lowering apparatus, and a lower spreader at the maximum boom raise angle and the length of the lowest boom portion are set such that the upper spreader can be lowered to the position of the spreader retainer if the boom raising/lowering apparatus lays the boom on the ground, and a boom raising/lowering rope is then loosened for disassembly of either the tower or normal boom. Consequently, the upper spreader can be lowered to the position of the spreader retainer on the lowest boom portion when the boom is disassembled either for the tower crane or normal crane specification.