Title:
OPENING-FORMING TOOL
Document Type and Number:
WIPO Patent Application WO/2015/029338
Kind Code:
A1
Abstract:
An opening-forming tool is provided with a hollow pipe (2) and a sheet material (3) which is wrapped around the hollow pipe (2). The hollow pipe (2) has outer peripheral ribs formed on the outer periphery thereof. The outer peripheral ribs are formed helically so as to wind around the axis of the hollow pipe (2). The lead angle of the helical outer peripheral ribs is 60º.
Inventors:
OOJI SHINICHI (JP)
Application Number:
PCT/JP2014/004058
Publication Date:
March 05, 2015
Filing Date:
August 04, 2014
Export Citation:
Assignee:
BBENG CO LTD (JP)
International Classes:
E04G15/06
Foreign References:
| JP2004011271A | 2004-01-15 | |||
| JPH0236555U | 1990-03-09 |
Attorney, Agent or Firm:
KATSURAGAWA, Naoki (JP)
Naoki Katsuragawa (JP)
Naoki Katsuragawa (JP)
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