| 摘要 |
<p>An air tank for replenishing compressed air inside conventional hammering piston upper chambers was built into air spring-type driving tools that return a hammering piston to top dead center, using an electric motor as the drive source therefor, move the hammering piston downwards, by using the compressed air in the hammering piston upper chamber generated as a result, and drive the driving tool. As a result, air tank replacement and other maintenance was difficult. In order to improve the maintenance characteristics of driving tools, the present invention has a configuration comprising a pump unit (50) that generates compressed air by the reciprocal motion of a pump piston (52) and replenishes the hammering piston upper chamber (25), separately from the compressed air for the hammering piston upper chamber (25). Conventional air tanks can be eliminated as a result of having said built-in pump unit (50).</p> |
