| 单词 | hammer drill |
| 释义 | > as lemmashammer drill hammer drill n. a percussion drill. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > drill > power drills > percussion drills pneumatic drill1861 percussion drill1871 road drill1907 hammer drill1908 piston drill1910 jackhammer1912 1908 R. Peele Compressed Air Plant xx. 249 Numerous small air hammer drills..have come into favor in the past few years... The hammer drill strikes a light blow. 1922 Encycl. Brit. XXXI. 958/1 Machine drills underwent important changes during 1910–20, especially in the development of the ‘hammer’ drills... In the hammer drill, the bit is held stationary..and is struck a rapid succession of blows by the reciprocating piston-like hammer. < as lemmas |
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