Title:
WALL HOLE BORING TOOL
Document Type and Number:
Japanese Patent JP3836102
Kind Code:
B
Abstract:
PROBLEM TO BE SOLVED: To provide a wall hole boring tool capable of boring an oval hole at once in a wall material.
SOLUTION: An inner case 12 of a front opening box body is longitudinally movably arranged in an outer case 2 of a front opening rectangular box body having a transparent hood 3 in a front end part, and is driven by a chain sprocket 17 for journaling a central part to a central part of the inner case 12. A bush chain 13 revolving around an oval locus is arranged in the inner case 2. A plurality of boring blades 16 are horizontally projected forward from the bush chain 13. A front end surface of the outer case 2 is allowed to abut on the wall material, and while revolving the bush chain 13 by a rotary shaft 6 for longitudinally penetratingly fixing a central part of the chain sprocket 17, the inner case 12 is moved forward against resiliency of a compression coil spring 7, and the boring blades 16 are projected from the transparent hood 3, to bore an oval wall hole in the wall material.
Inventors:
Nabeyama, Makoto
Application Number:
JP2003000390012
Publication Date:
August 04, 2006
Filing Date:
November 19, 2003
Export Citation:
Assignee:
Nabeyama, Makoto
International Classes:
B23B51/05; B27C3/00; B23B51/04; B27C3/00; (IPC1-7): B23B51/05