| 单词 | jockey-pulley |
| 释义 | > as lemmasjockey-pulley jockey-pulley n. a small wheel which ‘rides’ upon the top edge of a larger one, used for obtaining a high speed, or for keeping a rope in the groove of a grooved wheel; an ‘idle’ pulley or wheel which ‘rides’ upon the belt or rope between two working pulleys so as to increase its contact surface upon these and to tighten it up when slack. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > parts which provide power > [noun] > pulleys pulleya1586 tension-roller1835 idle pulley1873 jockey-pulley1893 1893 Jrnl. Royal Agric. Soc. 3rd Ser. 4 715 A jockey pulley attached to the main frame is arranged to take up the slack of the chain. 1896 E. T. Carter Mot. Power Electr. Mach. 508 The advantage in the use of a jockey pulley is that the arc of contact of the belt on the working pulleys can be increased beyond what is obtainable with a free belt, thus shortening the necessary distance between the pulley centres. < as lemmas |
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