Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles
Patent
1991-09-05
1992-08-25
Haroian, Harry N.
Geometrical instruments
Straightedge type
Plural straightedges nonadjustably fixed at right angles
33476, 33480, B43L 700
Patent
active
051407558
ABSTRACT:
An apparatus for laying out positions for the attachment of studs having a desired center to center spacing therebetween on a base plate includes a flat layout square which is precisely dimensioned for easily marking stud positions with a marker on the base plate. The layout square includes a short arm and a long arm extending perpendicularly from the short arm. In one embodiment, the short arm has a width which is equal to the actual thickness of the stud, and the long arm has a length from the intersection of the long arm which is equal to the stud spacing. This layout square also includes a dominant indicator adjacent a free end of the long arm which is spaced from the free end by an offset distance equal to one half of the width of the short arm. In one configuration, the indicator is an outside notch in the long arm and may also further include an inside notch in the long arm. In another configuration, the long arm includes regular measuring lines and the indicator is a dominating line which stands out from the regular measuring lines. It is preferred that the short arm also includes an overall length which is equal to the actual width of the stud. In another embodiment, the width of the short arm is one half of the thickness of the stud, and the long arm has an overall length equal to the stud spacing.
REFERENCES:
patent: 686240 (1901-11-01), Whitehill
patent: 1196519 (1916-08-01), Caylor
patent: 1241976 (1917-10-01), Hill
patent: 1665400 (1928-04-01), Bittner
patent: 3169320 (1965-02-01), Currie
patent: 3834033 (1974-05-01), Pinkard
patent: 4301596 (1981-11-01), Sedlock
patent: 4499666 (1985-02-01), Smith
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