| 摘要 |
A pneumatic rotary grinding tool in which the motor unit (15) is displaceable between a rear, operative position and a forward, dislocated position. A safety guard (18) mounted on the tool housing (10) forms an axial support for the motor unit (15) to keep the latter in a rear, operative position, thereby maintaining a seal (23-25) in active position to prevent supplied pressure air from passing directly from the supply passage (12) to the exhaust passage (35) without energizing the motor unit (15). When the safety guard 18 is removed the motor unit (15) is dislocated by the air pressure to a forward position in which the seal (23-25) is rendered inactive and allows supplied pressure air to pass directly from the air supply passage (12) to the exhaust passage (35). A stepped diameter sleeve (30) serves as a distance piece between the motor unit (15) and the safety guard (18) both when the latter is properly mounted on the housing (10) and between a shoulder (28) on the motor unit (15) and an oppositely directed shoulder (27) in the housing (10) as the motor unit (15) is dislocated. |
