A projection on a machine part, such as a pawl for controlling the motion of a ratchet wheel in a watch escapement, that engages the teeth of a ratchet wheel to convert reciprocating motion to rotary motion or vice versa.
英
美
- 棘爪機器部件上的一個(gè)突出部分，例如在一個(gè)觀(guān)察棘輪裝置中控制棘輪運轉的棘爪，用來(lái)銜接棘輪的齒，以將往復運動(dòng)轉換為旋轉運動(dòng)；反之亦然
