| 摘要 |
The invention relates to an electro-mechanical lifting device comprising a lifting head and a controlling and positioning carriage, said lifting head comprising a substantially vertical telescopic cylinder element, comprised of a plurality of outer telescopic jacket elements and a corresponding number of inner telescopic threaded elements, an element for coupling the member to be lifted being provided above the upper jacket element, the upper element of the lower inner threaded element being coupled with said lifting member coupling element, the intermediate threaded element(s) being provided with an outer and an inner threading, while the lower inner threaded element is threaded only on the outer surface, coupling between said jacket elements providing means preventing their rotation each other. |
