Tightening device
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United States of America Patent
Stats
-
Apr 18, 1989
Grant Date -
N/A
app pub date -
Apr 15, 1987
filing date -
Apr 16, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
By transferring the power fed from a motor to a ratchet mechanism through means of an impact clutch mechanism, a relatively large torque is obtained by the impact clutch mechanism. In addition when a torque greater than a predetermined level is applied to the ratchet mechanism, reaction is never given to the operator's hand because the impact clutch mechanism does not transfer a force greater than the present torque to the ratchet mechanism, thus permitting safe operation. With the ratchet mechanism, moreover, it becomes possible to effect such operation as first loosening and removing by the operator's force such members as bolts and nuts which have been additionally tightened independently or strongly tightened to a level in excess of a certain torque preset for the device.
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