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Patent Searching and Data


Title:
IMPACT TOOL
Document Type and Number:
WIPO Patent Application WO/2019/167498
Kind Code:
A1
Abstract:
This impact tool is added with a support member for preventing loosening and tilting of a hammer. The impact tool is provided with: a spindle (130); a hammer (140) which is biased by a spring toward the front side of the spindle (130); a cam mechanism for supporting the hammer (140) in the axial direction; and an anvil (160) which is struck by the hammer (140), wherein a needle bearing (180) is provided for supporting the outer peripheral surface of the hammer (140). The cam mechanism comprises: a spindle cam groove (133) and a hammer cam groove (144); and a cam ball (51) which is disposed in the two grooves. The needle bearing (180) is fixed inside a hammer case (103), has on the inner peripheral surface thereof a plurality of needle rollers (181), and pivotally supports the rotational and axial movements of the hammer (140) by coming into contact with the outer peripheral surface (140a) of the hammer (140).

Inventors:
HIRANO Masaru (1060, Takeda Hitachinaka-City Ibaraki, 02, 〒3128502, JP)
MURAKAMI Takuhiro (1060, Takeda Hitachinaka-City Ibaraki, 02, 〒3128502, JP)
Application Number:
JP2019/002481
Publication Date:
September 06, 2019
Filing Date:
January 25, 2019
Export Citation:
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Assignee:
KOKI HOLDINGS CO., LTD. (15-1, Konan 2-chome Minato-k, Tokyo 20, 〒1086020, JP)
International Classes:
B25B21/02
Foreign References:
JP2016159383A2016-09-05
US3030839A1962-04-24
JP2017035772A2017-02-16
US2907240A1959-10-06
US20140338946A12014-11-20
US3053360A1962-09-11
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