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A directly driving electromotive jack device for releasing a torsional force comprises 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 switc

A directly driving electromotive jack device for releasing a torsional force comprises 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. 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 the electromotive motor; and a switch connected to the driving screw rod. The electromotive motor is fixed to the positioning plate by a plurality of studs. The arms of torsional force serve to connect 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. The aforesaid torsional force releasing means serves to combine the rotary shaft of the electromotive motor with the sleeve. When the rotary shaft of the electromotive motor rotates, the torsional force can be 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.

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[ What is claimed is:] [1.]1. 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

[ What is claimed is:] [1.]1. 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.