削岩機 はつり機械 ハツリ機 ジャックハンマー Drucklufthammer marteau-piqueur
A [b]jackhammer[/b] is a pneumatic or electro-mechanical [[tools|tool]] that combines a [[hammer]] directly with a [[chisel]]. It was invented by William Mcreavy, who then sold the patent to "Charles Brady King":[https://en.wikipedia.org/wiki/Charles_Brady_King]. Handheld jackhammers are generally powered by compressed air, but some are also powered by electric motors. Larger jackhammers, such as rig-mounted hammers used on [[construction]] [[machinery]], are usually hydraulically powered. These tools are typically used to break up [[rock]], [[pavement]], and concrete. 

It is known as [b]pneumatic drill[/b] or [b]demolition hammer[/b] in British English.

h1. See also
* [[Pancor Jackhammer]]
* [[tag group:technology]]
* Wikipedia entry: "Jackhammer":[https://en.wikipedia.org/wiki/Jackhammer]
jackhammer