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Title:
METHOD FOR TIGHTENING SCREW JOINTS WITH A HAND HELD POWER TOOL
Document Type and Number:
WIPO Patent Application WO/2012/126780
Kind Code:
A1
Abstract:
A method for tightening a screw joint up to a predetermined target torque level (TT) by means of a hand held torque delivering power tool, wherein a tightening torque is applied on the screw joint during a tightening phase (E) via a snug torque level (TS), indicating during the tightening phase (E) a torque growth characteristic (Δt1), interrupting the torque application on the screw joint at the arrival at the target torque level (TT) to prevent further rotation of the screw joint, resuming torque application via declination ramp (F) at a declining rate after the target torque level (TT) is reached, wherein the resumed torque application is declined at a rate responsive to the indicated torque growth characteristic (Δt1) to obtain an economically favourable torque reaction characteristic in the power tool.

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JPH0819969HYDRAULIC PULSE WRENCH
WO/2001/053707CONNECTING ELEMENT IN THE FORM OF A SCREW, NUT, OR DISC FOR A SCREW CONNECTION AND A METHOD FOR TIGHTENING THE SAME
Inventors:
ADAM KLOTBLIXT (SE)
Application Number:
PCT/EP2012/054436
Publication Date:
September 27, 2012
Filing Date:
March 14, 2012
Export Citation:
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Assignee:
ATLAS COPCO TOOLS AB (SE)
ADAM KLOTBLIXT (SE)
International Classes:
B25B23/14
Foreign References:
US5216795A1993-06-08
US5245747A1993-09-21
US5216795A1993-06-08
Attorney, Agent or Firm:
BEKS, Axel (Patent Department, Stockholm, SE)
Download PDF:
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Claims:



 
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