Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles
Patent
1987-04-06
1988-09-27
Martin, Jr., William D.
Geometrical instruments
Straightedge type
Plural straightedges nonadjustably fixed at right angles
33474, B43L 1300
Patent
active
047731630
ABSTRACT:
The disclosed guide, or square, has an elongated planar body, and a planar cross bar angled normal off one end edge of the elongated body, somewhat in the configuration of a "T". One end of the cross bar projects away from the elongated body only a short distance, of the order of 1/4 to 5/8 of an inch; while the other end of the cross bar projects a much greater distance from the elongated body, of the order of 11/8 to 11/4 of an inch, to correspond generally in length to the width of the narrow side of a standard framing member or stud. Correspoding side edges of the elongated body and cross member lie in a common plane disposed normal to the corner intersection between the elongated member and cross bar. With the elongated body positioned against the wide side of the stud, and the extended cross bar end squared against one narrow side of the stud, the cross bar end projects virtually across the one narrow side of the stud. Thus, with this single guide setting, one can consecutively mark both this one narrow side and the wide side of the stud; and need only reposition the guide once, placing the elongated body against the remaining narrow side of the stud and the extended cross bar end lined up with the mark already made on the wide side, to mark the remaining narrow side of the stud.
REFERENCES:
patent: 204428 (1878-06-01), Eaton
patent: 660876 (1900-10-01), West
patent: 4538354 (1985-09-01), Smolik
patent: 4654978 (1987-04-01), Wolford, Jr.
Lind Charles F.
Martin, Jr. William D.
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