a heavy drill for breaking up a road surface, etc., by the rapidly repeated blows of a bit driven by compressed air.
| 单词 | θ212296 |
| 释义 | society > occupation and work > equipment > piercing or boring tools > [noun] > drill > power drills > percussion drills (6) pneumatic drill1861 a heavy drill for breaking up a road surface, etc., by the rapidly repeated blows of a bit driven by compressed air. percussion drill1871 a drill that works by delivering a rapid succession of heavy blows. road drill1907 (a) a mechanical drill (now typically a pneumatic drill) used for breaking up road surfaces; (b) the routine or ‘drill’ for crossing a road safely… hammer drill1908 a percussion drill. piston drill1910 a percussion drill in which the bit is attached to the rod of a piston. jackhammer1912 A portable powered (typically pneumatic) drill with a sharp bit for breaking up hard surfaces. Also (and in earliest use) more fully jackhammer drill. |
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