PNEUMATIC PULSE TOOL WITH SHUT-OFF MECHANISM
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United States of America Patent
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May 20, 2015
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May 28, 2014
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Abstract
A pneumatic torque impulse delivering power tool with an automatic power shut-off mechanism including: a pneumatic motor, a drive member rotatable by the pneumatic motor, an air supply channel, with a shut-off valve, for providing pressurized air, and a valve control device that can shut the shut-off valve and stop the air flow when the drive member is exposed to a retardation magnitude above a certain threshold level. The valve control device includes: an inertia responsive member rotatable with the drive member between initial and shut-off positions in which the shut-off valve cannot and can close, respectively, and an air damped movement restrictor which can counteract a movement of the inertia responsive member towards its shut-off position such that the shut-off valve is shut when the drive member is exposed to a retardation magnitude above a certain threshold level corresponding to a dampening force of the air damped movement restrictor.
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