弹簧柱塞也叫球头柱塞，或者是定位珠/柱，是在螺牙内部装设弹簧，使其内部的珠子&销子设定预压力，上下行程运动的产品。适用于机械装置，夹治具，模具，自动化机械......等
当弹簧最终抬高柱塞，将开关推向“打开”位置时，雨刷开始运行。
The spring eventually caused the plunger to rise, and moved the switch to the “on” position. The wipers wiped.
当引擎冷却时，通过出口软管吸入空气，在真空管产生吸气，导致柱塞向下挤压弹簧。
The engine, as it cooled itself, sucked in air through the outlet hose, producing suction in the vacuum chamber, and so drawing the plunger down and compressing the spring.
它是一款非常小巧的真空管，形状和大小如浴缸塞，内含一个柱塞和弹簧，由两个小型空气软管连接。
It was a small vacuum chamber, about the size and shape of a bathtub stopper, that contained a plunger and spring, and had two small air hoses attached to it.
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