Semi-open one-piece tennis ball for teaching
A one-piece, semi-open technology, applied in ball games, sports accessories, etc., can solve problems such as affecting teaching efficiency, consuming manpower or time, and achieving the effect of improving teaching efficiency and preserving coaches' physical fitness.
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[0044] see Figure 1 to Figure 3 , a semi-open one-piece tennis ball for teaching, including a sphere 1, and a wrist cover used with the sphere 1, a magnetic rope 2 is connected between the wrist cover and the sphere 1, and a pair of symmetrical about the center of the sphere is opened on the sphere 1 A flaring groove 101 is formed on the inner wall of the flaring groove 101 close to the center of the ball. A threaded groove 102 is formed on the inner wall of the flaring groove 101. One end of the magnetic rope 2 is fixedly connected with a joint 3, and the joint 3 is threadedly connected to the inside of the threaded groove 102. The wrist sleeve includes a sleeve 4 , the upper and lower ends of the sleeve 4 are fixedly connected with an elastic sleeve 5, and the entire wrist sleeve can be stably worn on the wrist through the elasticity of the elastic sleeve 5 ( figure 1 The inner diameter of the sleeve 4 is larger than that of an average adult man’s wrist, the side end of the...
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