Title:
STRIKING TOOL
Document Type and Number:
WIPO Patent Application WO/2014/208058
Kind Code:
A1
Abstract:
A striking tool which can increase a striking force of a hammer is provided. The striking tool includes: a spindle 23; and a hammer 24 which is attached to an outer peripheral surface of the spindle 23 and which converts a torque of the spindle 23 into a striking force in a rotation direction. The striking tool includes: a first outer cam groove 23b and a second outer cam groove 23c which are provided on the outer peripheral surface of the spindle 23 and are arranged in a circumferential direction around an axis A1 of the spindle 23; a first inner cam groove 24a and a second inner cam groove 24b which are provided on an inner peripheral surface of the hammer 24 and are arranged in the circumferential direction around the axis A1; and a plurality of balls 25 each of which is held by each of a plurality of paired cam grooves formed of a pair of the first outer cam groove 23b and the first inner cam groove 24a and a pair of the second outer cam groove 23c and the second inner cam groove 24b. The first outer cam groove 23b and the second outer cam groove 23c are arranged at positions different from each other in a direction along the axis A1.
Inventors:
MASHIKO HIRONORI (JP)
NISHIKAWA TOMOMASA (JP)
NISHIKAWA TOMOMASA (JP)
Application Number:
PCT/JP2014/003279
Publication Date:
December 31, 2014
Filing Date:
June 18, 2014
Export Citation:
Assignee:
HITACHI KOKI KK (JP)
International Classes:
B25B21/02
Foreign References:
| US20020094907A1 | 2002-07-18 | |||
| US3207237A | 1965-09-21 | |||
| DE102011089914A1 | 2013-06-27 | |||
| GB531797A | 1941-01-10 | |||
| JP2003181774A | 2003-07-02 |
Attorney, Agent or Firm:
TSUTSUI, Yamato (3F Shinjuku Gyoen Bldg., 3-10, Shinjuku 2-chome, Shinjuku-k, Tokyo 22, JP)
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