| 摘要 |
<p>An impulse tool comprises an anvil (10), a percussion piston (12) and a spring element (14) for generating the impact movement of the percussion piston. The tool also comprises a cylinder (16), inside which the percussion piston is configured to be movable, as well as means for tensioning the spring element. The anvil, the percussion piston, and the cylinder delimit a substantially gas-tight cavity with a variable volume, and the spring element is fitted in said cavity. The percussion piston is configured to move within the cylinder, in the direction of the longitudinal axis of the cylinder, in such a way that the percussion piston impelled by the spring element can hit the anvil. The spring element is placed in a closed cavity, whereby its possible breaking off does not cause dangerous situations. The impulse tool can comprise means for supplying the cavity with compressed gas and for removing the gas quickly from the cavity. Introducing compressed gas into the cavity will cause an increase of the pressure in the cavity, whereby the percussion piston will move in the cylinder and the spring element will extend and be excited. When the gas is abruptly removed from the cavity, the percussion piston will hit the anvil, pulled by the extension spring.</p> |
