Abstract: A synchronous opening and closing structure and a backpack including the same are provided. The synchronous opening and closing structure includes: a first opening and closing structure including a first sliding member and a first tape assembly, wherein the first sliding member is slidably disposed on the first tape assembly so that the first tape assembly is in a closed state or in an open state; a second opening and closing structure including a second sliding member and a second tape assembly, wherein the second sliding member is slidably disposed on the second tape assembly so that the second tape assembly is in the closed state or in the open state; and a connecting structure including a connector connecting the first sliding member and the second sliding member, wherein the connector moves to a first direction and a second direction opposite to the first direction.

Abstract: A motor with an auto output adjusting device. This motor has a plurality of stator independent coils to drive the rotor separately and a torque sensor sensing how large the load of the machine the motor drives is and commanding an electric circuit for adjusting the number of said stator independent coils to get electricity according to the load sensed by said torque sensor. Then this motor can economize the electric power by cutting down the current used in driving the machine when the machine is working idle or below its maximum load.

Abstract: This invention provides a double driving device which includes two motors, sharing a same common shaft or having their shafts linked together, and a control circuit. The two motors have different horse power and are used in machines, such as presses or shearing machines, which always use only one motor with less power to operate while the machines is not loaded but both of the motors while the machine is loaded so as to save the energy consumed unnecessarily during periods of no practical work. The control circuit is used to supply the intermittent operation of the motor with greater horse power.