| 摘要 |
<p>An air impact screwdriver (1), wherein a slidable contact nose (12) is fitted to a nose (5) to switchingly operate a contact valve (23) on the upper side of the contact nose by the contact nose, an AND circuit for pilot-operating an air motor control pilot valve (39) and a piston control pilot valve (41) is formed of a trigger valve (8) operated by a trigger lever (9) and the contact valve (23), and when the contact nose is pushed in and the trigger lever is pulled, the air motor control pilot valve and the piston control pilot valve are switched to the start positions, and the air impact screwdriver is started.</p> |
