ELECTRIC TOOL

WIPO Patent Application WO/2010/041600

A1

The transmission of an electric tool, such as a screwdriver, is configured to be automatically shifted from a high-speed low-torque mode to a low-speed high-torque mode based on external torque applied to a spindle. When the transmission is locked, movement of a switch lever when off is used to reset to the initial state, so turning the switch lever on requires force, with the problem that operability is diminished. With the invention, the transmission is automatically reset without the operability of the switch lever being sacrificed. A reset arm (91) that operates a reset motor (92) as the drive source is provided separately from the switch lever. A lock ring (82) is returned to an unlocked position that permits rotation of a second-stage internal gear and the transmission mechanism is reset to the high-speed low-torque mode by the reset arm (91) being tilted. Thus, the transmission mechanism is reset to the initial state without diminishing the ease with which the switch lever is turned on.

JPH01171776	BOLT FASTENING CONTROL METHOD
JPH08232931	SCREW WITH SHEARABLE HEAD AND TOOL FOR TIGHTENING THE SAME
JP6984742	Electric tool

KONDO TOMOYUKI (JP)
ICHIKAWA YOSHITAKA (JP)
HAYASHI KATSUNA (JP)

PCT/JP2009/067233

April 15, 2010

October 02, 2009

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MAKITA CORP (JP)
KONDO TOMOYUKI (JP)
ICHIKAWA YOSHITAKA (JP)
HAYASHI KATSUNA (JP)

B25B23/14; B25B21/00

JP2002168311A	2002-06-14
JPH0972393A	1997-03-18
JPH068151A	1994-01-18

OKADA PATENT & TRADEMARK OFFICE, P. C. (JP)
Patent business corporation Okada international patent firm (JP)

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