Title:
WORK TOOL
Document Type and Number:
WIPO Patent Application WO/2012/090711
Kind Code:
A1
Abstract:
[Problem] To provide an effective technology for preventing wear and tear related to power transmission in a work tool having a power transmission mechanism for transmitting drive-motor power to the tip of the tool. [Solution] This work tool is an electric screwdriver (101) that has a drive motor (111) and a power transmission mechanism (131) for transmitting the power of the drive motor (111) to a driver bit (119), and that tightens screws on a material being processed via the driver bit (119). The power transmission mechanism (131) comprises: a drive gear (133) that is rotated and driven by the drive motor (111); a spindle (117) that holds the driver bit (119) and is disposed spaced apart from the drive gear (133) in the longitudinal axis direction of the driver bit (119), and to which relative rotation between itself and the drive gear (133) is allowed; a magnet (134) provided in the drive gear (133); and a conductor (137) provided to the spindle (117) and disposed at a prescribed distance from the magnet (134). In a state where the magnet (134) and the conductor (137) are disposed with a prescribed distance therebetween, when the drive gear (133) rotates relative to the drive gear (133), an eddy current produced by the magnetic flux of the magnet (134) flows through the conductor (137) and as a result power is transmitted from the drive gear (133) to the spindle (117).
Inventors:
IKUTA HIROKI (JP)
MATSUURA YUTA (JP)
KAMIMOTO JUNPEI (JP)
NISHIO YOSUKE (JP)
MATSUURA YUTA (JP)
KAMIMOTO JUNPEI (JP)
NISHIO YOSUKE (JP)
Application Number:
PCT/JP2011/078961
Publication Date:
July 05, 2012
Filing Date:
December 14, 2011
Export Citation:
Assignee:
MAKITA CORP (JP)
IKUTA HIROKI (JP)
MATSUURA YUTA (JP)
KAMIMOTO JUNPEI (JP)
NISHIO YOSUKE (JP)
IKUTA HIROKI (JP)
MATSUURA YUTA (JP)
KAMIMOTO JUNPEI (JP)
NISHIO YOSUKE (JP)
International Classes:
B25B23/157; B25B21/00; B25F5/00; F16D27/01; F16H49/00
Foreign References:
| JP2004291136A | 2004-10-21 | |||
| JPH09254046A | 1997-09-30 | |||
| JPH05253854A | 1993-10-05 | |||
| JP2007228735A | 2007-09-06 | |||
| JP2006105210A | 2006-04-20 | |||
| JP2006162047A | 2006-06-22 |
Attorney, Agent or Firm:
IWATA Tetsuyuki et al. (JP)
Tetsuyuki Iwata (JP)
Tetsuyuki Iwata (JP)
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Claims: