Angle and distance measuring instrument

Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable

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33421, 33451, 33462, 33463, 33465, 33495, 33538, G01B 306, G01B 356

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active

049168223

ABSTRACT:
An angle measuring instrument provides two straight arms connected at one end for relative pivotal movement. A telescoping assembly includes two elongated telescoping members each providing a free end. The free end of one telescoping member is pivotally connected to one arm and the free end of the other telescoping member is connected to the other arm. The telescoping members provide scales indicating the angular position between the two arms, the distance between the pivots of the free ends of the telescoping members on the arms, and a correction to be added to or subtracted from measurements along the length of the arms to establish distances from the corner which is being measured. The two arms can pivot through a full 360 degrees relative to each other, permitting the measurement of inside and outside corners of all sizes. A straight edge is removably mounted on one of the arms when measuring outside corners. A level is provided to establish the position of one of said arms relative to a horizontal direction.

REFERENCES:
patent: 1215441 (1917-02-01), Walker
patent: 1264531 (1918-04-01), Lambert
patent: 1289047 (1918-12-01), Hall
patent: 1468598 (1923-09-01), Libby
patent: 1559386 (1925-10-01), Valentine
patent: 1825759 (1931-10-01), Smith
patent: 1999105 (1935-04-01), Milla
patent: 2160820 (1939-06-01), Bensen
patent: 2507460 (1950-05-01), Schacht
patent: 4097999 (1978-07-01), Nowlin
patent: 4535542 (1985-08-01), Liu et al.
McDowell, E., Abstract of Serial No. 634,131, filed Dec. 10, 1945, published in O.G. Aug. 15, 1950.

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