Tool driving or impacting – Processes
Reexamination Certificate
2004-12-27
2008-12-23
Rada, Rinaldi I. (Department: 3721)
Tool driving or impacting
Processes
C173S180000, C173S181000, C173S182000, C173S183000, C173S176000
Reexamination Certificate
active
07467669
ABSTRACT:
A method and a power tool system are provided for performing screw joint tightening using a pneumatic torque impulse power tool that is controlled by a control unit. A torque magnitude and a torque growth are calculated based on signals delivered by an angle sensor, and pressurized air is supplied to the power tool via a flow regulating valve which is successively adjustable between zero and full power flow. The flow regulating valve is controlled by the control unit to deliver a reduced power air flow to the power tool before and during a first delivered impulse, and then to deliver full power flow until a certain torque magnitude or a percentage of a target torque level is reached, whereafter the air supply flow is again reduced until the target torque level is reached, and when the target torque level is reached the air flow is shut off.
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Friberg John Robert Christian
Karlberg Erland
Schoeps Knut Christian
Sjöblom Torbjörn Rafael
Atlas Copco Tools AB
Frishauf Holtz Goodman & Chick P.C.
Lopez Michelle
Rada Rinaldi I.
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