| 摘要 |
<p>An impact tool. A piston movable in a cylinder is pushed up by hydraulic pressure, compressing a gas in a chamber over the piston. The compressed gas drives down the piston by its repulsive force to strike a tool such as a chisel. A valve body in a valve chest in a valve box attached to the cylinder is also reciprocated up and down by hydraulic pressure to communicate an oil supply port for hydraulic pressure to act on alternately the piston and the valve body.</p> |
