Electric screwdriver and a controller thereof

Details Electric screwdriver and a controller thereof Electric screwdriver and a controller thereof

2007-02-28

2008-12-16

Nash, Brian D (Department: 3721)

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

C173S002000, C173S020000, C173S171000, C173S217000

Reexamination Certificate

active

07464769

ABSTRACT:
An object of the present invention is to provide an electric screwdriver device having a function for determining that a correct tightening operation has been carried out when the tightening operation has taken a time longer than a reference time predetermined for the tightening operation, characterized in comprising a novel feature for determining the reference time. The electric screwdriver device of the present invention comprises a torque monitor (40, S4) for monitoring whether or not a load torque in carrying out the tightening by using the electric screwdriver12has reached the tightening completion torque, a timer (40, S1, S5) for measuring the time consumed from the starting of the tightening operation until the tightening torque has reached the tightening completion torque, as the tightening operation time, and a reference time setter (40, S6-S10) for determining the reference time for a subsequent tightening operation based on a plurality of tightening operation time obtained from the timer in the tightening operations carried out for the predetermined number of screws.

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English translation of Office Action issued Feb. 15, 2008 in Chinese patent application No. 200580034720.9.
Office Action issued Jun. 10, 2008 in Japanese patent application No. 2004-250757 (with translation).

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