WALL HOLE BORING TOOL
Document Type and Number:
Japanese Patent JP3836102
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.
August 04, 2006
November 19, 2003
B23B51/05; B27C3/00; B23B51/04; B27C3/00; (IPC1-7): B23B51/05