Device for tightening threaded joints
First Claim
1. Apparatus for tightening a threaded joint in two subsequent tightening steps, namely a first tightening step up to a torque snug level and a second tightening step up to a predetermined pretension level, comprising:
- a power tool (10) comprising an electric brushless motor for providing a variable speed output;
a variable output, controllable, power supply means (11) coupled to said power tool (10) for supplying an electrical output power to said power tool; and
control means (12) coupled to said power supply means (11) for controlling the electrical output power of said power supply means (11), said control means (12) including a programmable unit which is arranged to cause said power supply means (11) to provide a gradual change, in relation to time, of a speed related parameter so as to cause the speed of said power tool output to gradually accelerate during substantially the entire second tightening step.
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Accused Products
Abstract
The invention concerns a device for tightening threaded joints in two subsequent steps, namely a first step during which a joint is tightened to a predetermined torque snug level and a second step during which the joint is further tightened up to a final predetermined pretension level. During the second tightening step the angle speed of the power tool (10) is gradually increased at a predetermined rate. The power tool (10) comprises an electric brushless motor which is supplied with power from a variable frequency output inverter (11), and the gradual increase in angle speed of the power tool (10) is accomplished by a gradually increased output frequency and voltage from the power supply means (11).
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Citations
3 Claims
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1. Apparatus for tightening a threaded joint in two subsequent tightening steps, namely a first tightening step up to a torque snug level and a second tightening step up to a predetermined pretension level, comprising:
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a power tool (10) comprising an electric brushless motor for providing a variable speed output; a variable output, controllable, power supply means (11) coupled to said power tool (10) for supplying an electrical output power to said power tool; and control means (12) coupled to said power supply means (11) for controlling the electrical output power of said power supply means (11), said control means (12) including a programmable unit which is arranged to cause said power supply means (11) to provide a gradual change, in relation to time, of a speed related parameter so as to cause the speed of said power tool output to gradually accelerate during substantially the entire second tightening step. - View Dependent Claims (2, 3)
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Specification