Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Adjustable – tool-guiding jig
Reexamination Certificate
1999-08-24
2001-04-17
Tsai, Henry (Department: 3722)
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Adjustable, tool-guiding jig
C408S088000, C408S097000, C408S103000
Reexamination Certificate
active
06217266
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to drilling tools and more particularly to drill guides or jigs. More specifically, the present invention relates to a drilling jig for guiding an elongated drill bit when drilling a hole through a panel such as a door from one edge thereof to the opposite edge.
2. Description of the Prior Art
A fixture for use in drilling a hole through a door from one edge to an opposite edge is shown in U.S. Pat. No. 5,791,834, issued Aug. 11, 1998, to Raymond E. Zehrung for “Fixture for Drilling a Longitudinal Hole in a Door”.
A long drill bit which is capable of maintaining a desired penetration angle and path when drilling long holes is shown in U.S. Pat. No. 4,906,146, issued Mar. 6, 1990, to Roy E. Bowling for “Axially Self-Aligning Drill Bit”. The drill bit has a stiffly flexible shank with a unique drilling tip that maintains the desired path and does not walk or deflect therefrom.
OBJECTS OF THE INVENTION
The principal object of the present invention is to provide an improved drilling jig or guide for guiding a drill bit when drilling long holes through panels such as doors from one edge to the opposite edge thereof.
Another object of the invention is to provide a drilling jig or guide of the foregoing character which is rugged, simple to use, and accurately directs a drill bit through a door or like panel from edge to edge and between the surface panels thereof.
SUMMARY OF THE INVENTION
The present invention is a drilling guide or jig for use in guiding a long, stiffly flexible drill bit when drilling a long hole through a panel such as a door from one vertical edge to the other between the spaced side or face panels thereof, such as for drilling a hole from a hinge area of a door to a lock or latch area of the door for use in wiring an electric lock.
The jig embodying the invention is formed by a narrow, elongated, rigid, base plate positionable or mountable on one edge, such as a vertical edge, of a door or panel. The plate defines opposed longitudinal side edges, shorter end edges, and opposed surfaces therebetween. The plate further defines an elongated slot opening into said surfaces for passing a drill bit. One of the surfaces is adapted for placement against an edge of the door, usually in a hinge area when drilling a hole for the installation of wiring for an electric lock.
A pair of elongated rigid arms are mounted one on each plate side edge at about the midpoint thereof and extend generally perpendicularly to the plate surfaces. At least one cap screw secures each arm to the juxtaposed plate edge. The arms define a pair of spaced jaws extending from the surface of the plate adapted to be placed against the panel edge. The jaws engage opposite sides of the door panel for holding the jig securely against the door. The arms further define a pair of spaced apart support members extending from the surface of said plate opposite the edge engaging surface. A drill guide supporting block is pivotally mounted between the support members at a point spaced from the plate. The block is secured to the arms by cap screws when positioned in a selected angular relationship thereto. A drill guide tube is adjustably carried by said block and extends between the arms for supporting and guiding an elongated drill bit extending and drilling at said selected angle through the elongated slot for producing a long hole extending transversely through the panel from one panel edge to the other at the selected angle.
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patent: 5018912 (1991-05-01), Reitz
patent: 5791834 (1998-08-01), Zehrung
patent: 6116826 (2000-09-01), Benway
patent: 2645576 (1990-10-01), None
patent: 2203069 (1988-10-01), None
Crandell Ralph F.
Tsai Henry
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