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. 29, 2014
Filed:
Dec. 16, 2010
Kyung-soo Kim, Daejeon, KR;
Hanjong Ju, Daejeon, KR;
Soo Hyun Kim, Daejeon, KR;
IN Gwun Jang, Daejeon, KR;
Yunsub Jung, Daejeon, KR;
Eun Ho Kim, Daejeon, KR;
Youn Sik Park, Daejeon, KR;
Byung Man Kwak, Daejeon, KR;
Kyung-Soo Kim, Daejeon, KR;
Hanjong Ju, Daejeon, KR;
Soo Hyun Kim, Daejeon, KR;
In Gwun Jang, Daejeon, KR;
Yunsub Jung, Daejeon, KR;
Eun Ho Kim, Daejeon, KR;
Youn Sik Park, Daejeon, KR;
Byung Man Kwak, Daejeon, KR;
Abstract
A crane for loading and unloading a cargo includes multi-stage trolley. The multi-stage trolley for a crane includes a first trolley movable in a longitudinal direction along a boom of the crane; a second trolley movable in a lateral direction on the first trolley; a hoisting wire provided in the longitudinal direction along the boom; a spreader connected to the hoisting wire through the first trolley and the second trolley and supported by the hoisting wire, the spreader being movable in a vertical direction according to a movement of the hoisting wire. The multi-stage trolley further includes a sheave block unit for changing a direction of the hoisting wire to maintain a vertical level of the spreader constant when the first trolley and/or the second trolley is moved.