Patent attributes
A lifting device having parallel double screw rods includes a motor, a first transmission and a second transmission. The first transmission includes a screw rod driven by the motor and a telescopic tube assembly threadedly connected to the screw rod and linearly movable relative to the screw rod. The distal end of the telescopic tube assembly is fixedly connected on a connecting piece. The second transmission is provided at one side of the first transmission and parallel thereto. Further, the second transmission includes a sleeve driven by the motor to rotate, a telescopic tube assembly accommodated within the sleeve and axially movable relative to the sleeve, and a screw rod threadedly connected to the telescopic tube assembly and linearly movable relative to the telescopic tube assembly. The distal end of the telescopic tube assembly is connected to the connecting piece. With the above arrangement, each screw rod is interchangeable and the cost can be reduced.
