Geometrical instruments – Gauge – Door and window
Reexamination Certificate
1999-02-12
2001-05-15
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Gauge
Door and window
C033S041100
Reexamination Certificate
active
06230413
ABSTRACT:
TECHNICAL FIELD
This invention relates to carpentry tools, and more particularly, the invention relates to a tool for marking the location of diagonal miter cuts on a door or window frame's molding strips and for spacing the molding strips precisely along the edge of the door or window jamb (hereafter called “jamb”).
BACKGROUND INFORMATION
Most standard door and window frames have molding strips attached along the outer perimeter of the frame, such as that shown in FIG.
8
. The molding is made of strips
40
,
42
of thin wood, which are nailed over the jambs
36
,
38
. For aesthetic purposes, a diagonal miter cut
44
is made where the strips
40
,
42
intersect at the corners of the doorframe.
When cutting and installing a door frame's molding strips, the conventional method for marking the location of the miter cut
44
is to simply position an uncut strip over the jamb, and then mark the miter cut with a pencil and straight edge. However, this method is cumbersome and inaccurate because the miter cut locations are usually being pencil-marked by visual approximation (i.e. by “eye-balling”) and pencil marks are wide or fuzzy. If the miter cut locations are not marked precisely, the result is poor craftsmanship: Gaps between the cut edges of the horizontal and vertical door molding strips, or uneven spacing between the door molding strips and the edge of the jamb.
The present invention is a marking tool that solves the above problems by marking the miter cut locations on the molding strips so that the strips are precisely cut and positioned with respect to each other and with the jambs. The result is dramatically improved craftsmanship.
SUMMARY OF THE INVENTION
The invention is a tool for marking diagonal miter cut locations on door and window frame molding strips and for spacing the strips a distance from the edge of the jambs. The tool comprises a base having parallel, spaced-apart first and second surfaces, the spacing between the first and second surfaces corresponding to the set-back distance between the molding strips and the edge of the jamb, and a means attached to the second surface for marking the miter cut locations on the molding strips. The base of the tool further comprises parallel, spaced-apart third and fourth surfaces, the spacing between the third and fourth surfaces also corresponding to the distance between the molding strips and the edge of the jamb. Preferably, the means are a pair of blades, and the base is made of a plastic material.
In operation, the first surface is positionable against the edge of the jamb such that the means can contact a molding strip perpendicularly positioned on the jamb relative to the tool. By rotating the tool outwardly—pivoting on corner away from molding—a swiping action causes the blade to score the molding strip, marking the location where the miter cut is to start. To space the molding strip from the edge of the jamb, the third surface is positioned against the edge of the jamb, and the molding strip is positioned against the fourth surface.
REFERENCES:
patent: 4570350 (1986-02-01), Cullison
patent: 5274902 (1994-01-01), Rowley
patent: 5604988 (1997-02-01), Costelloe
patent: 996346 (1976-09-01), None
Bennett G. Bradley
Miller Nash LLP
Verbitsky Gail
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