Patent ID: 6299138
Filing Date: 2001-10-09
Classification: B66F,Y10S

Abstract:
A directly driving electromotive jack device for releasing a torsional force comprising a jack with a driving screw rod, an electromotive motor arranged with a deceleration gearbox, a torsional force releasing means directly connected to a positioning plate and the jack, a power supply directly switch operable by an operator; characteristic in that:the torsional force releasing means serves to connect the electromotive motor with the jack, the torsional force releasing means comprises a positioning plate for fixing the electromotive motor, two or more than two symmetric arms of torsional force, a bearing for being passed through by the electromotive motor, a switch connected to the driving screw rod, wherein the electromotive motor is fixed to the positioning plate by a plurality of studs; the arms of torsional force serve to connected the positioning plate with pivotal shafts of the jack; the rotary shaft of the electromotive motor and the driving screw rod are positioned in a same central line; the driving screw rod passes through the bearing and the sleeve; the bearing is fixed on the pivotal shafts and is positioned between the pivotal shafts and the sleeve; and the sleeve is connected with the rotary shaft of the electromotive motor;wherein when the rotary shaft of the electromotive motor rotates, the torsional force is cancelled by the torsional force releasing means for preventing the jack from generating a strain or being tilt; moreover, by a switch of a power source to control the direction of the current flow, the jack can be lifted or descended.