可以是被动凸轮保护器，也可以是有两个或更多凸轮装置的弹簧保护装置。
Can be a passive CAM or a spring-loaded device with two or more camming pieces on a stem.
如果把一台机器全部拆散开来，这台机器便成为一堆如螺母、螺钉、弹簧、齿轮、凸轮、轴等简单部件—即所有机械的构成单元。
Thus, if a machine is completely dismantled, a collection of simple parts remains such as nuts, Bolts, springs, gears, cams, and shafts the Building Blocks of all machinery.
这通常涉及使用弹簧或两个认真协调凸轮表面。
This usually involves the use of a spring or of two carefully coordinated cam surfaces.
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