Title:
PIPE DRILLING TOOL, AND METHOD FOR JOINING PIPES USING SAID DRILLING TOOL
Document Type and Number:
WIPO Patent Application WO/2019/044057
Kind Code:
A1
Abstract:
[Problem] To provide a pipe drilling tool for forming, in a pipe, a hole for introducing a non-oxidizing gas such as nitrogen, when joining pipes such as refrigerant pipes by brazing, wherein the pipe drilling tool has a compact configuration allowing operation thereof to be performed by the drilling tool being gripped by the hand of a user, in addition to which burrs are not readily generated, and cutting residue and burr residue are prevented from remaining inside the pipe.
[Solution] A pipe drilling tool 1 according to the present invention performs drilling by pressing a convex blade 12 upward from the interior toward the exterior of a pipe P in such a way that the convex blade intersects a wall surface of the pipe P at right angles, and therefore a hole H is formed in such a way as to intersect the wall surface of the pipe P at right angles, thereby achieving a process with which burrs are not liable to be generated, and with which cutting residue and burr residue generated during drilling are expelled to the outside of the pipe P, making it possible to prevent said residues from remaining inside the pipe P. In addition, the pipe drilling tool 1 according to the present invention has relatively few component members, has a compact configuration with good operability allowing operation thereof to be performed by the user gripping a handle portion 3, 4, in addition to which the hole H can be opened using a simple means, and therefore workability is also good.
Inventors:
TANAKA TOMOMI (JP)
Application Number:
PCT/JP2018/019277
Publication Date:
March 07, 2019
Filing Date:
May 18, 2018
Export Citation:
Assignee:
TANAKA KYOGYO INC (JP)
International Classes:
B23K1/00; B21D28/34; B23K31/02; B26F1/02; B26F1/32; F25B41/00
Foreign References:
| JPS5929774Y2 | 1984-08-27 | |||
| JPH09308919A | 1997-12-02 | |||
| JP3100225U | 2004-05-13 | |||
| JPH0422905Y2 | 1992-05-27 | |||
| JPH10193000A | 1998-07-28 | |||
| US3877280A | 1975-04-15 |
Attorney, Agent or Firm:
HATA, Masanori (JP)
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