A POWER CONTROL DEVICE FOR A PNEUMATIC IMPULSE WRENCH
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United States of America Patent
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Oct 8, 2015
filing date -
Oct 9, 2014
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Abstract
A pneumatic impulse wrench includes a motor, a housing with a pressure air inlet passage, an exhaust air outlet passage, and an air flow control valve provided in the exhaust air outlet passage and including a valve element shiftable between an exhaust air flow restricting position and an exhaust air flow non-restricting position. A rigid contact member is provided to positively define the exhaust air flow restricting position of the valve element, and a bypass passage of a well-defined flow area is provided to let through a limited exhaust air flow as the valve element occupies the flow restricting position in engagement with the contact member.
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