Title:
DEVICE FOR POLISHING METAL PIPE INNER SURFACE, AND METAL PIPE
Document Type and Number:
WIPO Patent Application WO/2020/262562
Kind Code:
A1
Abstract:
In the present invention, a jig 21 includes: elastic brushes 44 protruding in a radial direction that is orthogonal to a shaft 23; and a tube 46 disposed more on the inner side in the radial direction than the brushes 44. The dimension between the shaft 23 and the tips of the brushes 44 is at least half of the inner diameter of a stainless steel pipe 1. When the jig 21 is disposed inside the stainless steel pipe 1, the tube 46 pushes the brushes 44 outward in the radial direction, thereby tips of the brushes 44 abut the inner surface of the stainless steel pipe 1 while remaining erect, applying an internal pressure. This configuration causes the polishing agent supplied from a pump 12 to adhere to the inner surface of the stainless steel pipe 1. The polishing agent adhered to the inner surface of the stainless steel pipe 1 is pressed against the inner surface of the stainless steel pipe 1 by the brushes 44.
Inventors:
FUKUMOTO YASUJI (JP)
NAKAJIMA MINORU (JP)
KAWAGUCHI TADASHI (JP)
NAKAJIMA MINORU (JP)
KAWAGUCHI TADASHI (JP)
Application Number:
PCT/JP2020/025109
Publication Date:
December 30, 2020
Filing Date:
June 25, 2020
Export Citation:
Assignee:
OSAKA SANITARY CO LTD (JP)
International Classes:
B24B5/40; B24B29/00
Foreign References:
| JPH07276197A | 1995-10-24 | |||
| JPS61214958A | 1986-09-24 | |||
| JP2004243433A | 2004-09-02 | |||
| JPH0538629A | 1993-02-19 | |||
| JP2008264929A | 2008-11-06 | |||
| JPH061438U | 1994-01-11 | |||
| US20040089323A1 | 2004-05-13 | |||
| JP2002028873A | 2002-01-29 | |||
| JPH08126944A | 1996-05-21 | |||
| JPS4857833A | 1973-08-14 | |||
| JP2006192395A | 2006-07-27 | |||
| JPH11188594A | 1999-07-13 |
Other References:
See also references of EP 3991914A4
Attorney, Agent or Firm:
KAJI, SUHARA & ASSOCIATES (JP)
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