Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Patent
1995-02-17
1996-09-24
Smith, Scott A.
Tool driving or impacting
Automatic control of power operated means
Drive means responsive to torque or speed condition
192150, B25B 23145
Patent
active
055581684
ABSTRACT:
A pneumatic power nutrunner comprises a housing (10), a rotation motor (19), an air inlet passage (15), a torque limiting release clutch (20) located between the motor (19) and an output shaft (13), which clutch (20) includes overriding cam elements (24, 25) spring biassed via a thrust sleeve (26), and a shut-off valve (30) in the air inlet passage (15) axially supported by an activating rod (32, 36) which by its forward end engages a latch (40) radially displaceable into a recess (42) in the thrust sleeve (26) for releasing the activating rod (32, 36) and the shut-off valve (30) for axial displacement at clutch release. The shut-off valve (30) comprises a pneumatic actuator (31, 34) for accomplishing an extension of the axial displacement of the activating rod (32, 36) at part closure of the shut-off valve (30). Cam elements (39, 43) on the activating rod (32, 36) and the thrust sleeve (26) are arranged to cooperate with the latch (40) to accomplish an extension of the thrust sleeve (26) displacement at clutch release and closure of the shut-off valve (30).
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Atlas Copco Tools AB
Smith Scott A.
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