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Title:
DRILLING DEVICE FOR ENLARGED-DIAMETER HOLE
Document Type and Number:
WIPO Patent Application WO/2019/159740
Kind Code:
A1
Abstract:
This drilling device for forming an enlarged-diameter hole is provided with: a guide sleeve that is provided with a cylindrical body and a guide to be inserted into a bottomed hole; a slide body that moves back and forth in the cylindrical body; a bit holder that is provided to the slide body so as to be oscillatable; and a diameter-expanding bit that is detachably fitted to the bit holder and provided with a cutting blade. The diameter-expanding bit moves back and forth between a first position where the cutting blade is separated from the bottom of the bottomed hole and a second position where the cutting blade is closer to the bottom of the bottomed hole than that at the first position. The guide has: a guide piece that guides the cutting blade to the side surface part, of the bottomed hole, corresponding to the enlarged-diameter hole following the advance of the diameter-expanding bit from the first position to the second position; and an opening that is formed with a size allowing passage of the diameter-expanding bit removed from the bit holder in a state where the diameter-expanding bit is in the first position.

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Inventors:
MIYANAGA MASAAKI
Application Number:
JP2019/003878
Publication Date:
August 22, 2019
Filing Date:
February 04, 2019
Export Citation:
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Assignee:
KK MIYANAGA (JP)
International Classes:
B28D1/14; B23B41/00
Domestic Patent References:
WO2015025492A12015-02-26
Foreign References:
JPH04294912A1992-10-19
US4594033A1986-06-10
JP2018001690A2018-01-11
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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