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US 5,205,031 AGranted
Device for tightening threaded joints
AssigneeAtlas Copco Tools AB
InventorGunnar C. Hansson
Life of this patent
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Abstract
A method and a device for tightening threaded joints includes applying torque on the joint by means of a power tool until a predetermined pretension level in the joint is reached, whereupon a controller connected to the power tool is arranged on one hand to initiate power shut-off and on the other hand to initiate continued successively decreasing power supply to the tool as the predetermined pretension level is passed.
Claims2
A device for tightening threaded joints to a predetermined torque level, comprising:
- a torque delivering power tool (10);
- power supply means (11) connecting said power tool to a power source, for supplying power to said power tool;
- control means (12) coupled to said power supply means (11) for controlling said power supply means (11);
- and
- means for detecting torque delivered by said power tool in relation to time;
- said control means (12) comprising means for controlling said power supply means to initiate shutting off of the power supply to said power tool as a predetermined torque level is reached, and for controlling said power supply means to initiate a continued, gradually over time decreasing power supply to said power tool as said predetermined torque level is reached.
3 more elements
Dependencies are inferred from the claim text.