- A pulley on a shaft that rests on or presses against a drive gear to steer it or take up slack. Also known as idle wheel.
- a pulley on a shaft that presses against helpful tips belt to steer or tighten it
- a pulley that rests upon a belt to tighten up it; a pulley that just guides a belt and is perhaps not familiar with transfer energy.
Hypernym for "idle pulley"
- pulley block
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