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Title:
SQUARE PIERCING DRILL BIT
Document Type and Number:
Japanese Patent JP2015013382
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To generate a square hole by using a rotary drill device.SOLUTION: A rotary arbor 2 having a drill 8 and an umbrella gear 4 is attached to an electric drill 1. At the same time to rotation of the rotary arbor 2, a plane trunk 3 rotates around a non-rotary shaft 5 by the umbrella gear 4. The non-rotary shaft 5 does not fall because of a falling prevention receptor 7 attached to the arbor 2. Both sides of a round hole generated by rotation of the drill 8 are cut by the plane trunk 3 for forming a square hole. Uncut parts remaining on front and rear positions are cut by rotating the plane trunk 3 by 90 degree and inserting a drill bit again.

Inventors:
FUJITA TOSHIO
Application Number:
JP2013139714A
Publication Date:
January 22, 2015
Filing Date:
July 03, 2013
Export Citation:
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Assignee:
FUJITA TOSHIO
International Classes:
B27C3/02



 
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