Geometrical instruments – Scriber – Parallel line
Reexamination Certificate
1998-09-17
2001-09-18
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Scriber
Parallel line
C033S429000, C033S437000, C033S474000, C033S677000, C033S479000, C033S669000
Reexamination Certificate
active
06289594
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a tool for measuring, cutting and scoring stock planer material. More particularly, the present invention is concerned with a new and improved drywall cutting guide for quickly marking and cutting drywall sheets.
Drywall board is used extensively in the construction of interior regions of all types of public and private structures. Drywall board is generally manufactured in large sheets of 4 feet by 8 feet or larger, and is comprised of a compressed chalk-like substance laminated on each side by a thin cardboard or paper material. These drywall sheets are used as an inexpensive wall or surface cover for interior construction support structures such as wood or concrete and are generally painted or covered with wallpaper trim to fit the cosmetic needs of the particular construction.
Because of their size, and the large surface area generally being covered by drywall sheets, drywall construction requires multiple sheets to be adjoined together in an abutting manner. To accomplish the necessary multiple flush abutments between adjoining drywall sheets, a drywall worker must make repetitive cuts in the drywall that are true and straight over a long distance.
The best method of creating a straight cut in a drywall sheet is to score one side of the paper laminate and snap the drywall by bending it along that score.
Alternative cutting methods that use a circular or straight serrated saw often create a rough cut that breaks apart the compressed inner substance of the drywall creating an edge that is not suitably accurate for an abutment or a cosmetic interior trim piece. The present invention provides an uncomplicated drywall cutting guide which enables the user to measure and produce a clean, straight, horizontal cut in a drywall sheet in a single operation with a common hand-held utility knife.
SUMMARY OF THE INVENTION
The present invention is an apparatus for guiding a cutting and marking device across the surface of a of stock planar material comprising a U-shaped channel, the U-shaped channel having an upper section, a lower section, and a mid section; the upper section connected to the mid section at a substantially right angle; the lower section connected to the mid section at a substantially right angle; a stem, the stem connected to the upper section; and a plurality of guide apertures being formed in said stem section. Alternatively, the invention could be described as an apparatus for guiding a marking and scoring device across the surface of a sheet of stock planar material comprising a midsection having a first midsection edge and a second midsection edge; a bottom section having a bottom section edge, the bottom section edge connected to the first mid section edge at a substantially right angle; a stem having a stem edge, the stem edge connected to the second mid section edge at a substantially right angle; a plurality of guide apertures being formed in said stem section.
The present marking and scoring guide includes a top portion and a stem portion. The top portion forms a U-shaped channel guide which is slidably engagable within an edge of a drywall sheet to be cut. The top portion is further normal to the drywall sheet planar surface. The stem of the guide incorporates a plurality of incrementally placed guide apertures to guide a marking or cutting or scoring device such that the marking or cutting or scoring device can be drawn across the drywall sheet in a straight line parallel with the edge of the drywall where the top of the guide is engaged. The guide apertures are made up of conical apertures for receiving a marking device such as a pencil, and of similarly positioned adjacent linear slits for receiving the blade of a common utility knife or the like.
REFERENCES:
patent: D. 367617 (1996-03-01), Wiegman
patent: D. 376988 (1996-12-01), Bruno
patent: D. 399440 (1998-10-01), Taylor
patent: 844157 (1907-02-01), Loughborough
patent: 1849493 (1932-03-01), Larkin
patent: 5103570 (1992-04-01), Nichols
patent: 5182975 (1993-02-01), Warner
patent: 5309642 (1994-05-01), McGinnis
patent: 5497558 (1996-03-01), Wagner
patent: 6032378 (2000-03-01), Null
patent: 6070331 (2000-06-01), Dempsey
Guadalupe Yaritza
Gutierrez Diego
Ryan Kromholz & Manion S.C.
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