Geometrical instruments – Straightedge type – Square and pivoted straightedge
Patent
1984-05-18
1985-04-30
Smith, Robert I.
Geometrical instruments
Straightedge type
Square and pivoted straightedge
33173, 33427, B43L 700, B43L 1324
Patent
active
045135100
ABSTRACT:
A measuring tool including a flat member having the shape of a right triangle and having upper and lower surfaces and a first side and second side which form a right angle at their intersection, a tee affixed along the edge of the first side which is perpendicular to the flat member and extends from both the upper and lower surfaces of the flat member, a first slot extending along the first side and running approximately parallel to the first side, a first stop bolt slidably affixable in the first slot, a second slot extending along the second side and running approximately parallel to the second side; a layout bar having a thickness equal to that of the extension of the tee from the surface of the flat member, the layout bar having a fastening slot perpendicular to the second slot and being alignable with the second slot; the layout bar having a recessed channel running along its length, and a second stop bolt slidably affixable in the recessed channel so that the tee and the layout bar when affixed to the flat member provide a planar surface along the first and second sides, the planar surface being substantially parallel to the surface of the flat member, and the first and second stop bolts extend away from the surface of the flat member and beyond the planar surface formed by the tee and the layout bar.
REFERENCES:
patent: 175113 (1876-03-01), Kuhns
patent: 183387 (1876-10-01), Essex
patent: 864096 (1907-08-01), Kaempf
patent: 1001316 (1911-08-01), Smith
patent: 1014453 (1912-01-01), Clark et al.
patent: 2805484 (1957-09-01), D'Aoust
patent: 3623232 (1971-11-01), Hahlstadt
patent: 4244105 (1981-01-01), Goussios
Smith Robert I.
Vander Weit, Jr. John
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