| 单词 | tumbling crank | 
| 释义 | > as lemmastumbling crank   tumbling crank  n.  Brit. , U.S. see quot. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > shaft > 			[noun]		 > parts of > other parts spring collet1845 post boxa1884 tumbling crank1886 sheave1887 vibration damper1932 taper-lock1954 1886    J. Barrowman Gloss. Sc. Mining Terms 69  				Tumbling-crank, a crank on the end of the pumping shaft for giving reciprocating motion. < as lemmas | 
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