定位珠(ball plunger和Spring plunger)，又叫球头柱塞或弹簧柱塞。是一种由壳体，弹簧，球珠或柱体组成的负载设备（SLDs）。广泛用于一些医疗器械设备、润滑设备、气动工具等产品上面。工程师往往在模具，夹具，装配等工作中使用到它。借助一定压力的弹簧推动球体的运动，使得设备顺利运行。
其特征在于它包括定位体，电控透光的十字坐标板和定位珠；
The utility model is composed of a positioning body, an electric control translucidus cross coordinate board and a positioning ball;
胶线分别穿过两排定位管，连接靠背和坐垫的硬塑料通风管、木珠和弹性边框；
Rubber wire through these two rows of fixing tubes connects ventilating tube of chair back and cushion wooden beads and elastic frame.
抽签被刻印的数字珠仔将放到被朝下放各一指定位置，以便对手在游戏未结束时看出你的号码或轻易地被透露。
The number chip being drawn will then be placed on the score ball faced down so that people cannot see what your Numbers are and can be easily be revealed when the game finished.
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