| 摘要 |
<p>A pneumatic rotating grinding tool in which the motive air supply to the motor (12) is controlled by a speed governor as well as a releasable overspeed safety valve (51). The speed governor comprises a fly weight operated valve sleeve (41) arranged to control the air flow through an inlet opening (30) in an air flow barrier means (23, 28) provided by parts of the rear end wall (22) of the motor (12). These parts include an annular steel washer (28) which is located transverse to and coaxial with the rotation axis of the motor rotor (20), and which forms said governor controlled air inlet opening (30).</p> |
