Bolt or nut tightening device
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United States of America Patent
Stats
-
Jul 20, 2010
Grant Date -
May 1, 2008
app pub date -
Oct 25, 2007
filing date -
Oct 30, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A bolt or nut tightening device has an outer shaft and an inner shaft rotatable in directions opposite to each other, the outer shaft having a reaction receiver projecting therefrom sideways, the inner shaft being provided with an engaging portion engageable with a bolt or nut to be tightened, the bolt or nut tightening device being provided on the outer shaft with a tightening torque measuring unit, which comprises a strain sensor, a circuit board, an indicator, a battery, and a case for accommodating the circuit board, the indicator and the battery, the case being attached to the outer shaft, projecting toward the same direction as the reaction receiver, and being so sized as to be hidden by a contour of the reaction receiver and so positioned as to be hidden behind the reaction receiver when seen from the forward end side of the engaging portion.
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