Geometrical instruments – Straightedge type – Combined with level
Patent
1994-10-12
1995-10-24
Will, Thomas B.
Geometrical instruments
Straightedge type
Combined with level
33471, 33499, B43L 710, G01C 900
Patent
active
054599350
ABSTRACT:
A combination tool for craftsmen including a square, a level, a plumb indicator, a slope measurement device, a linear scale, and a straight edge. The tool includes a pair of elongated members joined at a hinge with a protractor scale for measuring the angle between the members. The hinge comprises a sturdy clevis arrangement which allows a central fastening assembly to be tightened to provide friction in order to set the angle between the two arms without other locking structure. A series of markings along one edge of each of the members provides a linear scale. Each of the elongated members have an I-beam construction with a central web and a pair of side flanges. A number of elongated cutouts are provided for handles. A second series of cutouts are provided to position a plurality of spirit level indicators. Some of the spirit level indicators are aligned along the longitudinal axis of the members, while others are positioned transverse to the longitudinal axis. An adjustable level indicator allows the measurement of the inclination of one or more surfaces on which the tool is positioned.
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Paulson Eldon D.
Paulson Gregory A.
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