Title:
CYLINDRICAL TUBE
Document Type and Number:
Japanese Patent JP2002332760
Kind Code:
A
Abstract:
To provide a cylindrical tube that can repulse an attack by a hole saw.
A plurality of tapered storage holes 18, 18 are formed in the inner surface of an outside plate 6 so as to internally contact a circle where the inner peripheral surface of a cup and the outside plate 6 intersect, and a resistance plug 19 of the superhard quality of material is filled in each storage hole 18.
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Inventors:
WAKE HIDEO
IMAI AKIHIKO
ISHIKAWA HAJIME
TANAKA TAKUYA
IMAI AKIHIKO
ISHIKAWA HAJIME
TANAKA TAKUYA
Application Number:
JP2001137841A
Publication Date:
November 22, 2002
Filing Date:
May 08, 2001
Export Citation:
Assignee:
MIWA LOCK KK
International Classes:
E05B15/00; E05B15/16; (IPC1-7): E05B15/00; E05B15/16
Attorney, Agent or Firm:
Takeo Iida