Device for tightening threaded joints

Details Device for tightening threaded joints Device for tightening threaded joints

1992-02-04

1993-09-21

Eley, Timothy V.

Metal working

Means to assemble or disassemble

With means to regulate operation by use of templet, tape,...

29702, 29709, 29714, 318434, B23P 2100, B23Q 1500

Patent

active

052457478

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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