Mainspring

Keys of various sizes for winding up mainsprings on clocks.

Elgin pocketwatch mainsprings from around 1910, showing (l-r): spiral, semi-reverse, reverse.

A mainspring is a spiral torsion spring of metal ribbon - commonly spring steel - used as a power source in mechanical watches, some clocks, and other clockwork mechanisms. Winding the timepiece, by turning a knob or key, stores energy in the mainspring by twisting the spiral tighter. The force of the mainspring then turns the clock's wheels as it unwinds, until the next winding is needed. The adjectives wind-up and spring-powered refer to mechanisms powered by mainsprings, which also include kitchen timers, music boxes, wind-up toys and clockwork radios.

单词	Main spring
释义	Main spring 原声例句美国原版语文第三册 But how was he to get the materials out of which to make the wheels and the main spring? 但是，如何才能得到制作轮子和主发条的必要材料呢？英语百科 Mainspring A mainspring is a spiral torsion spring of metal ribbon - commonly spring steel - used as a power source in mechanical watches, some clocks, and other clockwork mechanisms. Winding the timepiece, by turning a knob or key, stores energy in the mainspring by twisting the spiral tighter. The force of the mainspring then turns the clock's wheels as it unwinds, until the next winding is needed. The adjectives wind-up and spring-powered refer to mechanisms powered by mainsprings, which also include kitchen timers, music boxes, wind-up toys and clockwork radios.
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Main spring

Mainspring