Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2000-09-11
2001-10-16
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S052000, C033S286000, C033S263000
Reexamination Certificate
active
06301997
ABSTRACT:
When a drywall screw gun is positioned in the center of a sheet of drywall, that part of a
2
×
4
stud located behind the sheet, and to which the sheet is to be attached, is not visible. The invention locates this invisible part, and informs the operator where to place the screw gun.
BACKGROUND OF THE INVENTION
FIG. 1
illustrates a sheet
3
of material, such as plywood or gypsum wallboard. Such a sheet
3
is generally installed over framing members
6
, which can take the form of joists, studs, or rafters. One installation method utilizes an electric drill, which drives threaded screws through the sheet, and into the framing members
6
.
However, when a screw is to be installed a distance from the edge
9
of the sheet, such as at point
12
along central longitudinal axis CAX, it is difficult to locate the framing member
6
, because that member is not visible at point
12
. One solution to the problem is to visually estimate the position of the framing member
6
, but that approach often results in errors, and produces screws which must be removed because they miss the framing member
6
.
Another solution is to snap a chalk line across the sheet
3
, which is aligned with the visible parts of the framing member
6
, as from points P
1
to P
2
. This solution is effective, but time-consuming.
OBJECTS OF THE INVENTION
An object of the invention is to provide an improved system for driving screws through sheet material into framing members.
SUMMARY OF THE INVENTION
In one form of the invention, an optical projector projects two rays of light outward from a common location, forming a “V.” The axis of the fastener extends through the vertex of the “V,” and lies in a common plane with the “V.” For example, the axis may bisect the angle formed by the “V.”
If these rays are properly positioned near two edges of a sheet of drywall, the axis will intersect a framing member located behind, and concealed by, the sheet, thereby indicating where to drive a screw.
REFERENCES:
patent: Re. 36257 (1999-07-01), Thomson
patent: 3906640 (1975-09-01), Sosa
patent: 3946493 (1976-03-01), Torres
patent: 3970391 (1976-07-01), Johnson et al.
patent: 4222175 (1980-09-01), Bernicky
patent: 4383373 (1983-05-01), Couturier
patent: 5052112 (1991-10-01), MacDonald
patent: 5782003 (1998-07-01), Bozzo
Shakeri Hadi
Smith James G.
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