Geometrical instruments – Straightedge type – Square and fixed straightedge
Patent
1994-05-16
1995-03-14
Wirthlin, Alvin
Geometrical instruments
Straightedge type
Square and fixed straightedge
33474, 33481, 33613, 33563, B43L 7027
Patent
active
053967100
ABSTRACT:
A generally U-shaped carpentry building tool is provided, which includes a reference plate member for placement on one or more building members and having an inner edge and outer marking edge; a first marking guide arm connected at 90.degree. to one end of the reference plate member; a second marking guide arm connected at 90.degree. to the other end of the reference plate member to form a generally U-shaped tool; a first lip member connected to one edge of the reference plate member to form a first right angle, corner-engaging member for engaging the corner of the one or more building members to properly position the reference plate member relative to the one or more building members; and a second lip member connected at 90.degree. to the center of the second marking guide arm to form a second right angle, corner-engaging member transverse to the first corner-engaging member for marking off a predetermined position to provide the proper centerline alignment of a second building member relative to the one or more building members.
REFERENCES:
patent: 3169320 (1965-02-01), Currie
patent: 4499666 (1985-02-01), Smith
patent: 4573276 (1986-03-01), Torczon
patent: 4607438 (1986-08-01), DeFrange
patent: 5140755 (1992-08-01), Simmons, Jr.
Sutton Ezra
Wirthlin Alvin
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