Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Patent
1988-01-21
1989-11-21
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Responsive to torque on work
81477, 173 12, B25B 23151
Patent
active
048814350
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.
REFERENCES:
patent: 3696871 (1972-10-01), Stenbacka
patent: 3739659 (1973-06-01), Workman, Jr.
patent: 3965778 (1976-06-01), Aspers et al.
patent: 4154308 (1979-05-01), Goldsberry
patent: 4300641 (1981-11-01), Kinkel
patent: 4328871 (1982-05-01), Gluskin
patent: 4480699 (1984-11-01), Elmer
patent: 4513827 (1985-04-01), Dubiel
patent: 4535850 (1985-08-01), Alexander
Atlas Copco Aktiebolag
Meislin D. S.
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