Patent ID: 8567762

Claim:
Electro-mechanical lifting device ( 1 ) comprising a lifting head ( 2 ) and a controlling and positioning carriage, said lifting head comprising a substantially vertical telescopic cylinder element ( 3 ), comprised of a first, second, third and fourth outer telescopic jacket elements ( 7 , 6 , 5 , 4 ), and corresponding first, second, third and fourth inner telescopic threaded elements ( 10 , 11 , 8 , 9 ), and a cap element ( 110 ) for coupling to a member to be lifted where said cap element ( 110 ) is provided above the first outer telescopic jacket element ( 7 ), characterized in that an upper end of the fourth inner telescopic threaded element ( 9 ) is coupled with said cap element ( 110 ) for the member to be lifted, the second and third inner telescopic threaded elements ( 11 , 8 ) being provided with an outer threading and an inner partial threading, while the fourth inner telescopic threaded element ( 9 ) is threaded only on the outer surface, said outer telescopic jacket elements ( 7 , 6 , 5 , 4 ) having means for preventing their mutual rotation relative to each other during actuation of said lifting device ( 1 ) by rotation of the telescopic cylinder element ( 3 ), starting from a position with the cap element ( 110 ) under said member to be lifted, and with said outer telescopic jacket elements ( 7 , 6 , 5 , 4 ) and inner telescopic threaded elements ( 10 , 11 , 8 , 9 ) within the fourth outer telescopic jacket element ( 4 ), said cap element ( 110 ), being fixed to said first outer telescopic jacket element ( 7 ) to prevent rotation of said fourth inner telescopic threaded element ( 9 ) during actuation which causes said fourth inner telescopic threaded element ( 9 ) to advance with respect to said third inner telescopic threaded element ( 8 ), thus causing withdrawal of said first outer telescopic jacket element ( 7 ) when said fourth inner telescopic threaded element ( 9 ) completes its stroke which causes said third inner telescopic threaded element ( 8 ) to advance with respect to said second inner telescopic threaded element ( 11 ), causing withdrawal of said third outer telescopic jacket element ( 5 ) when said third inner telescopic threaded element ( 8 ) completes its stroke which causes said second inner telescopic threaded element ( 11 ) to advance with respect to said first inner telescopic threaded element ( 10 ), causing withdrawal of said second outer telescopic jacket element ( 6 ) when said second inner telescopic threaded element ( 11 ) completes its stroke and cause the lifting device to reach a maximum extension said lifting device having a slide in for manual release of a motor, said motor being mounted on said slide, said slide being controlled by a toggle element, permitting sliding of motor with respect to the lifting head, in two positions which are respectively an engagement position and a release position, and having a manual control directly acting on the lifting device, so that said lifting device can easily be lowered and/or lifted under any condition.