PNEUMATIC TORQUE IMPULSE WRENCH WITH STEPPED SHUT-OFF FUNCTION
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United States of America Patent
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Issued Date -
Jul 18, 2013
app pub date -
Oct 24, 2011
filing date -
Oct 27, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A pneumatic torque impulse wrench comprises a housing (10), a motor (15), a hydraulic impulse unit (20) including an inertia drive member (21) and intermittently coupling the motor (15) to an output shaft (18), a shut-off valve (23) controlling the pressure air supply to the motor (15), and an activating mechanism (25) arranged to shift the shut-off valve (23) from a fully open position to a closed position via one or more partly closed positions. An activating mechanism (25) for shifting the shut-off valve (23) comprises a retardation responsive inertia element (28) movably supported on the inertia drive member (21), and a trip element (24) displaceable by the inertia element (28) and arranged to initially support the shut-off valve (23) in a fully open position during a screw joint tightening process and in succeeding one or more partly open positions for obtaining a power reduction of the motor (15) when approaching a target torque level.
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