Impact torque adjusting device of hydraulic torque wrench
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United States of America Patent
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Apr 30, 2013
Grant Date -
Mar 12, 2009
app pub date -
Sep 10, 2008
filing date -
Sep 11, 2007
priority date (Note) -
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Abstract
An impact torque adjusting device is constructed by forming an operating fluid channel 11b communicating through the inside of a liner 7 which becomes a high-pressure chamber H and a low-pressure chamber L at the time impact torque is generated. In the operating fluid channel 11b, a valve disc 11d is urged in the direction opening the operating fluid channel 11b. Behind the valve disc 11d, an oil chamber 11e communicates with the inside of the liner 7 which becomes a high-pressure chamber H at the time impact torque is generated, so that the operating fluid channel 11b may be narrowed in proportion to the increase of the operating fluid.
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