Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles
Reexamination Certificate
1999-03-31
2001-12-11
Fulton, Christopher W. (Department: 2859)
Geometrical instruments
Straightedge type
Plural straightedges nonadjustably fixed at right angles
Reexamination Certificate
active
06327786
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to right angle measurement in construction and, and more particularly to a carpenter's square with features for alignment of boards and for defining a pair of orthogonal directions and a related corner.
2. Description of Related Art
The following art defines the present state of this field:
Swanson, U.S. Pat. No. 3,492,737 describes an extensible rule having a plurality of telescopically engaged channel sections. The rule is provided with quickly detachable attachments for extending the range of its functional capabilities. The sections, except the outermost section, are frictionally slidable within each other nested in telescoping relationship. Each section had a flat web and side walls lying in planes normal to that of the web. Shallow recesses are formed in the outer surfaces and graduated strips are positioned in the recesses. The outermost section is a rectangular tube with a closed rear wall for enclosing the other inner sections when the other sections are completely retracted within the outermost section.
Simuro et al., U.S. Pat. No. 4,194,295 describes an attachment for a carpenter's folding ruler that has an elongated body with a longitudinal slot. The slot is dimensioned to accept the ruler and the ends of the body have flat sections against which part of the ruler can be folded to form certain angles. One of the ends makes a 90° angle with the axis of the slot while the other ends is at some angle less than 90°. A level is provided on the body so that it may be vertically or horizontally positioned.
Wilson, U.S. Pat. No. 4,729,173 describes an adjustable carpenter's square that is formed by having a main beam with a head secured to an upper portion of the main beam with a slide secured to the upper end of the main beam. The head and the slide are partially rotatably secured to the main beam. The head and the slide are slideably and adjustably connected to each other also in addition to being connected to the head.
Walters, U.S. Pat. No. 5,269,066 describes an improved hand tool comprising a generally L-shaped frame having two legs each formed with a pair of channels spaced apart by a central ridge, and having panels of transparent material, such as tempered glass or plastic, mounted in the channels with a quantity of a suitable liquid contained between the panels to define a level-indicating chamber extending substantially the entire length of each leg and having indicia positioned adjacent the ends of each of these chambers to provide information relating to incremental discrepancies.
Kunz, U.S. D314,712 describes the ornamental design for a T-square with centering ruler.
Groves, U.S. D260,616 describes the ornamental design for an adjustable carpenter's square.
The prior art teaches a variety of tools capable of enabling the alignment of boards and other construction materials at a right angle as for defining a corner of a construction. The prior art also teaches the use of construction stakes for defining a corner of a construction. However, the prior art does not teach a carpenter's square having a conformation and shape capable of easily aligning common boards by the use of U-shaped channels. The prior art also does not teach the use of such a square for defining a right angle in a construction line. The present invention fulfills these needs and provides further related advantages as described in the following summary.
SUMMARY OF THE INVENTION
The present invention teaches certain benefits in construction and use which give rise to the objectives described below.
The present invention is a carpenter' square which provides a pair of I-shaped legs joined at right angles, each of the legs having a pair of back-to-back U-shaped channels preferably of a size for accepting a construction material, such as common 2×4, 2×6 and 2×8 lumber boards. The lumber may be inserted snugly into them so as to align the lumber at right angles. The square also may include a gusset plate for mounting the square onto a construction stake so as to enable the alignment of construction lines at a right angle corner.
A primary objective of the present invention is to provide a carpenter's square having advantages not taught by the prior art.
Another objective is to provide such a carpenter's square that is able engage common lumber boards for right angle alignment of the boards.
A further objective is to provide such a carpenter's square that is able to engage construction lines while being mounted onto a construction stake so as to define a corner and a pair of orthogonal directions related to the corner.
Other features and advantages of the present invention will become apparent from the following more detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention.
REFERENCES:
patent: D. 260616 (1981-09-01), Groves
patent: D. 314712 (1991-02-01), Kunz
patent: 1336004 (1920-04-01), Victoria
patent: 2664636 (1954-01-01), Schneider et al.
patent: 3101184 (1963-08-01), Allen et al.
patent: 3492737 (1970-02-01), Swanson
patent: 4194295 (1980-03-01), Simuro et al.
patent: 4443954 (1984-04-01), Clark
patent: 4573276 (1986-03-01), Torczon
patent: 4641435 (1987-02-01), Brown
patent: 4656753 (1987-04-01), Chesworth
patent: 4729173 (1988-03-01), Wilson
patent: 4924579 (1990-05-01), Berendsen
patent: 5129150 (1992-07-01), Sorensen
patent: 5269066 (1993-12-01), Walters
patent: 5542187 (1996-08-01), Oakley
patent: 5657548 (1997-08-01), Kellar, Sr.
patent: 5771597 (1998-06-01), Hopf
patent: 5778546 (1998-07-01), Williamson
patent: 5778547 (1998-07-01), Wolken
patent: 5855073 (1999-01-01), Boelling
patent: 5897816 (1999-04-01), Johnson
patent: 6161297 (2000-12-01), Boggs
Fulton Christopher W.
Gene Scott-Patent Law & Venture Group
Verbitsky Gail
LandOfFree
Carpenters square with elevation attachment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Carpenters square with elevation attachment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carpenters square with elevation attachment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2588107