Electrically driven screw-driver

Details Electrically driven screw-driver Electrically driven screw-driver

B - Operations, Transporting

25

B

81/30

B25B 21/00 (2006.01)

Patent

CA 1172070

ABSTRACT OF THE DISCLOSURE An electrically driven screw driver is disclosed in which a ratchet device is mounted to a portion of a chucking shaft to which a driver bit is detachably connected and the chucking shaft is connected to an outputshaft of an electric motor through a planetary reduction system and in which a torque controlling mechanism having a clutch function is mounted to the planetary reduction system. In accordance with the electrically driven screw- driver, a combination of the ratchet device and the torque controlling mechanism permits the screw-driver to be operated in such a way that only the prefastening, or screwing step may be carried out mechanically and electrically while the finishing step of strong fastening may be performed manually, resulting in a very compact and ligh screw-driver which is very convenient in portability.

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