| 单词 | ratchet wheel |
| 释义 | > as lemmasratchet wheel ratchet wheel n. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > wheel > [noun] > cog or gear > ratchet ratch1696 ratchet wheel1736 ratchet1744 ratch-wheel1744 racket wheel1758 catch wheel1786 mousing1875 1736 Philos. Trans. 1735–6 (Royal Soc.) 39 85 The rachet-wheel..rests on one side upon the determinator, and upon a piece of brass of the same thickness. ?1790 J. Imison School of Arts (ed. 2) 17 It is requisite to have a ratchet-wheel on the end of the axle..with a catch to fall into its teeth. 1881 F. J. Britten Watch & Clockmakers' Handbk. (ed. 4) 76 Pivotted to the same centre as the weighted lever is a ratchet wheel with very fine teeth. 1988 D. Rees GCSE CDT—Design & Realisation xiii. 115 The gradual slope allows the pawl to slide over the surface but the steep slope prevents it from moving and so stops the ratchet wheel from rotating backwards. < as lemmas |
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