Power tool for two step tightening of screw joints
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United States of America Patent
Stats
-
Nov 21, 1989
Grant Date -
N/A
app pub date -
Jan 21, 1988
filing date -
Jan 27, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power tool for two step tightening of screw joints comprising a housing (10; 50), a rotation motor supported in said housing (10; 50), an output spindle (13, 54) rotated by said motor and connectable to a screw joint to be tightened, a power transmission including a clutch means (16-18, 25; 58, 60, 67) incorporated between said motor and said output spindle (13; 54), and power supply means connecting said motor to a power source. The clutch means (16-18, 25; 58, 60, 67) comprises a shift means (31; 84, 85) by which the mode of operation of the clutch means (16-18, 25; 58, 60, 67) is shiftable between a torque responsive releasing action during the first, high speed step of the tightening process and a non-releasing action during the second, low speed step of the tightening process, and a release detecting means (23; 83) associated with said clutch means (16-18, 25; 58, 60, 67) and arranged to act upon said power supply means to cause at least a substantial reduction in the power supply to the motor as said clutch means (16-18, 25; 58, 60, 67) is released during the first, high speed step of the tightening process.
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