Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Adjustable – tool-guiding jig
Reexamination Certificate
1999-09-01
2001-04-24
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Adjustable, tool-guiding jig
C408S097000
Reexamination Certificate
active
06220796
ABSTRACT:
BACKGROUND OF THE INVENTION
1) Field of the Invention
The invention herein relates to a multipurpose drilling jig having applications as a woodworking tool that assists in drilling series of perpendicular holes.
2) Description of the Prior Art
When drilling holes in woodworking, the best quality is achieved by utilizing a specialized vise or clamps to assist the operation. This is especially true in the case of most do-it-yourself household furniture. One common example is the perpendicular conjoinment of the two wood planks A and B, as indicated in
FIG. 2
,
FIG. 3
, and
FIG. 4
, wherein a series of holes must be drilled for the perpendicular insertion of the dowels C to accomplish the conjoinment. When drilling holes in woodworking, the best quality is achieved by utilizing a specialized vise or clamps to assist the operation. This is especially true in the case of most do-it-yourself household furniture. One common example is the perpendicular conjoinment of the two wood planks A and B, as indicated in
FIG. 2
,
FIG. 3
, and
FIG. 4. A
series of holes must be drilled for the perpendicular insertion of the dowels C to accomplish the conjoinment. The holes in the two wood planks A and B must be drilled accurately such that they are equidistantly apart from one another. Any discrepancy will preclude serial conjoinment. A drilling jig is therefore used. As shown in
FIG. 1
, the drilling jig is composed of a jig body
1
and a perpendicular stop
2
at the bottom section of the jig body
1
. Three locating holes
3
are bored in the top section
1
a
of the jig body
1
for the placement of a guide sleeve
4
and two locating pins
6
a
to guide the drilling of the holes. The provisions for attaching a handle
5
are provided at the rear end
1
b
, whereas the parallel straddling slots
6
and
7
are formed in the front end
1
c
and the perpendicular stop
2
, so as to provide straddling over the woodworking dowels C. As shown in
FIGS. 2-4
, the perpendicular stop
2
is supported against the side of the wood planks and the guide sleeve
4
in the top section of the jig body
1
, so as to drill the perpendicular holes. Thereafter, the dowels C are inserted into the holes already drilled and then into the front end
1
c
of the jig body
1
or the parallel straddling slots
6
and
7
, which are straddled into position over the outer diameter of the perpendicular woodworking dowels C such that the perpendicular dowels C are in the plank A, and that the straddling slots
6
and
7
serve as a standard criterion for positioning the guide sleeve
4
in the top section of the jig body
1
to guide the drill bit in the boring of the perpendicular holes in other wood plank B, thereby completing the operation of drilling the holes needed to conjoin the two wood planks A and B. The conventional dowel hole drilling jig seems practical; nevertheless it is not confirmed in actuality. A variety of dowel diameters and physical dimensions are available. The width of the front end
1
c
of the jig body
1
and the width of the straddling slots
6
and
7
in the perpendicular stop
2
are fixed. If the straddling slot width of the drilling jig is not exactly the same as the diameter and the physical dimensions of the working dowels, the drilling jig will be unusable, thereby requiring additional purchase of another unit matching the specifications. In addition, the guide sleeve
4
in the top section of the jig body
1
inserted into the locating hole
3
is freely movable, it is readily dislodged and lost during utilization or carriage, especially at the time when the drill bit is raised and when the guide sleeve
4
falls out after being drawn up. This type of the jig can only be utilized as drilling jig on level surfaces and does not function fully for drilling a vertical woodworking object.
In view of the said shortcomings, the inventor of the invention herein, based on many years of experience in the production and marketing of this category of products, conducted extensive research and testing, which finally culminated in the development of the practical invention herein.
SUMMARY OF THE INVENTION
The primary objective of the invention herein is to provide a multipurpose drilling jig that is capable of excellent locating and guiding for a wide range of dowel specifications and prevents the dislodging and loss of the guide sleeve during hole drilling.
Therefore, the multipurpose drilling jig of the invention herein is comprised of a jig body and a perpendicular stop conjoined to the bottom section of the said jig body; the said jig body has a number of locating holes formed in the top section that provide for placement of a guide sleeve and a movable locating pin which guide the drilling of perpendicular holes, provisions for a handle at the rear end, and aligned straddling slots in the front end and the said perpendicular stop that are capable of straddling and providing for the locating of woodworking dowels, and the innovations include the following aspects.
The jig body has a number of locating holes in the top section and a horizontally extending recessed section, with the recessed section providing for fitting of a cover plate that presses against the guide sleeve. The jig body and the perpendicular stop are provided at the front and the rear ends with insertion slot mounts arranged in a parallel alignment. The insertion slot mounts are provided with replaceable locating bodies which are in turn provided in the center line with a straddling slot. The jig body is provided in two sides with a threaded hole mount which is in turn provided in one side with a locating rib vertically disposed to serve as a parallel support for a side locating plate having a through hole in alignment with the threaded hole mount, thereby enabling installation by means of a mounting screw such that the end surface and lower lateral length of the side locating plate exceeds the height of the jig body to provide a perpendicular support surface serving as standard criterion of positioning to enable the locating and guidance operation for drilling a wide range of holes to accommodate various types of dowels.
REFERENCES:
patent: 2466023 (1949-04-01), Griffin
patent: 4176989 (1979-12-01), Wolff
patent: 4474514 (1984-10-01), Jensen
patent: 4583889 (1986-04-01), Fallon
patent: 4594032 (1986-06-01), Warburg
patent: 4602898 (1986-07-01), Brown et al.
patent: 5407306 (1995-04-01), Klapperich
patent: 136080 (1985-04-01), None
patent: 2092488 (1982-08-01), None
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