Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
April 10, 2007
0Patent Application Number
109840390
Date Filed
November 9, 2004
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A driver drill that can effectively prevent erroneous clutch operation in a drill mode is provided. A flat washer positioned between steel balls for locking an internal gear and a coil spring is rotatable by rotative operation of a mode-change ring. Also, protruding streaks are provided on a small-diameter unit of a second gear case around which a flat washer is externally mounted. The protruding streaks interfere with internal projections on an inner circumference of the flat washer at its predetermined rotating position to regulate a forward movement of the flat washer. When a drill mode is selected with the mode-change ring, the flat washer is locked by the protruding streaks.
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