Cutting by use of rotating axially moving tool – Processes – Bit detachable
Reexamination Certificate
2000-07-24
2001-10-30
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Processes
Bit detachable
C408S108000, C408S11500B, C408S705000
Reexamination Certificate
active
06309146
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to jigs or fixtures and more particularly to a fixture for accurately guiding a drill for drilling a long hole through a door from the hinge edge to the lock opening.
DESCRIPTION OF THE PRIOR ART
It is often necessary to provide electrical connection to an electric device such as a card reader or electric lock that is mounted in an aperture near the latch edge of a door. The electric wires pass through a long hole in the door and exit at the hinge edge of the door. The hole to receive the wires is often ⅜ inches in diameter and 3 feet long. To drill such a hole accurately, drill guides, or fixtures, such as those described in U.S. Pat. No. 5,791,834 issued Aug. 11, 1998 to Zehrung, have been developed. They clamp on the hinge edge of the door and hold the drill guiding bushings parallel to a face of the door at the edge. The Zehrung improvement allows the angle of the drill relative to the door edge to be adjusted to ensure that the drill will correctly arrive at its destination at the aperture at the other edge of the door. However, if the face of the door at that edge is not parallel to the desired path because of ornamentation or if the door is warped, the drill may not arrive at the center of the aperture and correctly positioned between the broad faces of the door.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a drill guiding fixture that will ensure that the drill will travel accurately from the entrance point at the hinge edge to its destination at the lock aperture independent of warping or irregularities of the door face at the hinge edge. The fixture of the invention has an elongate body with an edge clamp at a first end and an aperture clamp at a second end. The edge clamp clamps to the hinge edge to locate the entrance of the hole. The aperture clamp clamps though the aperture cut in the door for mounting the electric device at the latch edge of the door. The two clamps draw the body tightly against one broad face of the door. Drill guide bushings mounted on the body are aligned along an axis extending from the first end of the body toward the second end, parallel to the long axis of the body, and spaced apart from that axis by a fixed distance. This ensures that the drill will travel along a path parallel to the broad face that will arrive exactly at the destination, and also that irregularities at the door face at the hinge edge will not alter the drill path.
These and other objects, features, and advantages of the invention will become more apparent when the detailed description is studied in conjunction with the drawings in which like elements are designated by like reference characters in the various drawing figures.
REFERENCES:
patent: 3637318 (1972-01-01), Hayes
patent: 3707332 (1972-12-01), Wolf
patent: 3999880 (1976-12-01), Shabtai
patent: 4865496 (1989-09-01), Challis
patent: 5018912 (1991-05-01), Reitz
patent: 5046901 (1991-09-01), Taylor
patent: 5791834 (1998-08-01), Zehrung
patent: 5947656 (1999-09-01), Simson
patent: 6217266 (2001-04-01), Bowling
Dor-Cor™ Drill Fixture Catalog From Marray Enterprises, Inc. Santa Clara, CA 95050.
Blum Alvin S.
Howell Daniel W.
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