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Title:
BORING DEVICE
Document Type and Number:
WIPO Patent Application WO/2006/038291
Kind Code:
A1
Abstract:
A boring device for forming a V-cut by means of the tip (2a) of a punch (2) having a shear angle a the vertex b of which is at the position shifted from the center line O-O of the punch shaft by a predetermined distance c. The heights (lengths) of the right/left tip forward end parts (P3, P4) are different and these forward end parts (P3, P4) butt against a sheet material at different timings to lower the peak value. Consequently, the peak value of the boring force by the punch is lowered and the boring drive force is lowered.

Inventors:
MITA SHINICHI (JP)
Application Number:
PCT/JP2004/014757
Publication Date:
April 13, 2006
Filing Date:
October 06, 2004
Export Citation:
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Assignee:
DAIDO KOGYO KK (JP)
MITA SHINICHI (JP)
International Classes:
B26F1/04; (IPC1-7): B26F1/04
Foreign References:
JP2001198889A2001-07-24
JP2001009791A2001-01-16
JP2001079799A2001-03-27
JP2003533362A2003-11-11
JP2002337095A2002-11-26
Attorney, Agent or Firm:
Chikashima, Kazuo (9-7 Shibaura 1-chom, Minato-ku Tokyo 23, JP)
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