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A basketball game assembly includes a backboard, a hoop mounted on a front side of the backboard and a ball blocking device. The ball blocking device includes a shaft, a blocking member and a driving arrangement. The shaft at its rear end is rotatably mounted to the backboard. The blocking member is connected to a front end of the shaft and disposed adjacent to a front edge of the hoop. The driving arrangement is configured to rotate the shaft so as to have the blocking member move to a blocking position higher than the hoop or depart from the blocking position.

In this research, the verification on the torque limiter is completed by using the mechanism of a torque limiter integrated with the infrared optointerrupter feedback detection. Through a shuttle and an infrared optointerrupter, it is meant to determine whether the rotation mechanism is affected by the mechanism of a torque limiter. With this, it is available to determine if any jamming happens. Through the testing verification of physical mechanisms, the feasibility for the torque limiter proposed by this research is conducted. It can avoid current shorting when dead jamming happens. Also, the detection circuits relevant to the detection of motor current feedback can be saved to reduce systematical circuit maintenance and manufacture torque limiters with long life expectancy, higher stability and low cost.

This study mainly investigates and researches the production of micro-torque limiters by using magnetic force and infrared optointerrupters therein including a permanent magnet, a magnet set, a grating disk, an infrared optointerrupter and a microprocessor, a torque-driven screw rod with the torque generated by the magnetic adsorption force. As the torque limiter is a clutch body, when the external resistance is greater than or equal to the magnetic torque, the rotation of screw rod will stop but start sliding simultaneously. When the screw rod stops rotating, the shutter detection disk also stops rotating. Correspondingly, the pulse signal output of infrared optointerrupters stops. Therefore, the motor of MCU stops by precisely determining whether the screw rod is stopped by external force with the function of torque limiters well exerted. As such, a product advantaged with streamlined sizes, long life expectancy, higher stability, low cost and handy control is reachable.