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. 24, 2017
Filed:
Feb. 29, 2016
Kobe Steel, Ltd., Kobe-shi, JP;
Kobelco Cranes Co., Ltd., Shinagawa-ku, JP;
Hiroaki Kawai, Kobe, JP;
Takashi Hiekata, Kobe, JP;
Koji Inoue, Kobe, JP;
Shintaro Sasai, Hyogo, JP;
Toshiro Yamashita, Hyogo, JP;
Koichi Shimomura, Tokyo, JP;
Tetsuya Ogawa, Hyogo, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
KOBELCO CRANES CO., LTD., Shinagawa-ku, JP;
Abstract
A crane includes an overload safety device and a identifying unit. The overload safety device includes a maximum-load calculating unit configured to calculate a maximum load that a winch drum is capable of winding up with driving torques output from the remaining electric motors other than a failed electric motor identified by the identifying unit, an updating unit configured to update a set hoisting ability value stored in a storing unit to a value equal to the maximum load, and a control unit configured to cause the remaining electric motors to operate when a value of a load derived by a load deriving unit is equal to or smaller than a latest set hoisting ability value stored in the storing unit and stop the operation of the plurality of electric motors when the value of the load derived by the load deriving unit exceeds the latest set hoisting ability value.