Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Adjustable – tool-guiding jig
Reexamination Certificate
1999-10-22
2001-02-27
Bishop, Steven C. (Department: 3722)
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Adjustable, tool-guiding jig
C408S07200R
Reexamination Certificate
active
06193449
ABSTRACT:
This invention relates generally to drill templates and more particularly to templates for drilling holes for installation of door knobs and locks.
BACKGROUND ART
It is known among builders and carpenters that the hardest part of installing a door is drilling the holes for the door knob and lock.
Some door knob and lock assemblies come with paper or cardboard templates for drilling the holes in the proper places but they tear easily. As a result a few inventors have patented complex devices to solve this problem.
U.S. Pat. No. 5,222,845 to Goldstein & Collier filed Jun. 22, 1992 describes a drill guide apparatus held in place by a clamping screw and plate and having a plurality of apertures and drill bushings.
U.S. Pat. No. 4,715,125 to Livick filed Dec. 8, 1986 comprises a pair of spaced, parallel, rectangular, frame members for clamping to a door which members have a series of pin holes for adjusting the location of tubular hole cutting guides.
OBJECTS OF THE INVENTION
One object of the invention is to provide a drill template which perfectly aligns the holes for door knob and lock every time it is used.
Another object is to provide a sturdy drill template for holes for the door knob and lock, which can be reused repeatedly without losing its accuracy.
A further object is to simplify the tasks of aligning and drilling door knob and lock holes.
A still further object is to create a door hardware drill template with a minimum number of parts.
Yet another object is to develop a door hardware drill template which is inexpensive to manufacture.
SUMMARY OF INVENTION
This invention is in the form of a 3 sided bracket consisting of a template plate at a right angle to a lock plate again at a right angle to a reverse plate. The template and reverse plates each have an aperture sufficiently large enough for any size drill bit to pass through both.
The template plate has zee bracket sleeves surrounding the hole for slidably mounting removable plate guides.
Each plate guide has a perpendicularly annexed tubular drill guide of different size. The bracket's lock plate contains a circular hole for cutting the bed of the protruding locking device and for insertion of another tubular drill guide. This invention differs from the prior art in many respects, most particularly its one-piece 3 sided construction and slidably removable drill bit guide plates.
REFERENCES:
patent: 2843167 (1958-07-01), Rushton
patent: 3212366 (1965-10-01), Russell et al.
patent: 3392607 (1968-07-01), Gieseke
patent: 4306823 (1981-12-01), Nashlund
patent: 4331411 (1982-05-01), Kessinger et al.
patent: 4715125 (1987-12-01), Livick
patent: 4813826 (1989-03-01), Riedel
patent: 5114285 (1992-05-01), Brydon
patent: 5222845 (1993-06-01), Goldstein et al.
patent: 5573352 (1996-11-01), Matadobra
Bishop Steven C.
Gauer Paul R.
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