Document Type and Number:
Japanese Patent JPS4949355
Kind Code:
A
Abstract:
A double slewing crane comprises a vertical column support which directly supports a first crane thereabove and which rotatably supports a jib bracket for rotation about the axis of the support and the vertical axis of the first crane. The jib bracket carries a second crane and it is revolved with the jib bracket around the first crane. The drive for revolving the jib bracket with the second crane about the first crane comprises two separate diametrically opposite driving motors having drive shafts with drive pinions which engage a gear ring disposed around the first crane and the support structure.
Application Number:
JP6370473A
Publication Date:
May 13, 1974
Filing Date:
June 06, 1973
Export Citation:
International Classes:
B66C23/06; B66C23/52; B66C23/84; C01B21/06; (IPC1-7): B66C23/16
Foreign References:
| GB1265109A | 1972-03-01 |