| 摘要 |
<p>An air tool comprises a casing (1) having an internal bore (1a) and a piston (2) slidably mounted for reciprocal movement therein. The piston (2) is driven in the bore (1a) by a fluid supply (5) controlled by valve means (3). The valve means (3) is movable between a first position in which a drive portion (2b) of the piston (2) is in communication with the fluid supply (5) and is closed to the fluid exhaust means (14), and a second position, in which the drive portion (2b) of the piston (2) is closed to the fluid supply (5) and in communication with the fluid exhaust means (14).</p> |
