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Patent Searching and Data


Title:
ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2019/031275
Kind Code:
A1
Abstract:
Provided is an electric tool with which it is possible to suppress an increase in the diameter of an output portion while suppressing biting of a tip tool into an inner surface of the output portion. An output portion (9) includes a hole portion (914) and steel balls (923) which restrict relative movement in a front-back direction between a driver bit (P) and the output portion (9). The hole portion (914) includes six projecting portions (914A) and six recessed portions (914C). The six projecting portions (914A) abut against six side surfaces (P4) of the driver bit (P) to restrict relative rotation between the driver bit (P) and the output portion (9). The six recessed portions (914C) are recessed to the radially outer side of output portion (9) in such a way as to be separated from corner portions (P5) of the driver bit (P), and define a plurality of accommodating spaces (914a) which accommodate the corner portions (P5). The steel balls (923) are disposed in positions overlapping any of the six corner portions (P5). Regions in which the projecting portions (914A) do not abut against the side surfaces (P4) are larger than regions in which the projecting portions (914A) abut against the side surfaces (P4).

Inventors:
MURAKAMI Takuhiro (1060, Takeda Hitachinaka-City Ibaraki, 02, 〒3128502, JP)
Application Number:
JP2018/028261
Publication Date:
February 14, 2019
Filing Date:
July 27, 2018
Export Citation:
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Assignee:
KOKI HOLDINGS CO.,LTD. (15-1, Konan 2-chome Minato-k, Tokyo 20, 〒1086020, JP)
International Classes:
B25B21/00
Foreign References:
EP1122032A22001-08-08
JP2015160297A2015-09-07
JP3194138U2014-11-06
JP2005528991A2005-09-29
JP2011104665A2011-06-02
US5417527A1995-05-23
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