Korea Advanced Institute of Science and Technology

Hanjong Ju

Soo Hyun Kim

Kyung-Soo Kim

Sang Jun Yoo

In Gwun Jang

Byung Man Kwak

Yunsub Jung

Eun Ho Kim

Youn Sik Park

Kyung Woon Kwak

Yun Sic Hong

Doo Yeol Koh

Yoon Keun Kwak

Kyung Ii Kim

Kyong-Soo Kim

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.

Multi-stage trolley for a crane and a crane therewith

Growing community of inventors

Daejeon, South Korea

Hanjong Ju