| 摘要 |
An automatic bounce device for a center stick in a pen comprises a pen holder, a center stick, a restore resilient part, and a push part. A locating hole and an engaging hole is provided on the pen holder. The push part is composed of an upper cap and a lock key tube. The upper cap movably fits with an opening end on the pen holder and a clip extends from the upper cap. The clip has a projection corresponding to the locating hole. The key tube is sleeved in the opening end and extends out of the pen holder. A inverse elastic hook part with an engaging hook is provided on the lock key tube and the center stick is received in the key tube. When the lock key tube is pressed, the engaging hook is moved away the engaging hole and slides into the locating hole to expose the nib on the center stick. When the clip is pressed, the projection pushes the engaging hook away the locating hole and the center stick and the key tube are moved back by way of the elasticity of the resilient part and the flexibility of the buckled center stick. Thus, the engaging hook is received in the engaging hole again.
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