Angle measuring instrument

Details Angle measuring instrument Angle measuring instrument

1987-04-01

1988-08-30

Haroian, Harry N.

Geometrical instruments

Gauge

Pipe layout or fitting

33534, 33455, 33456, B43L 700

Patent

active

047666757

ABSTRACT:
An angle measuring instrument comprises, a multi-sided plate member which includes a first side and a second side that form an acute angle therebetween when they intersect, a third straight side that forms with the second side an obtuse angle when they intersect, and a graduated semi-circular region. A first measuring arm is pivoted to the plate member at the center of the semi-circular region, a second measuring arm is pivoted to the plate member at a point near the acute angle outside the circular region, and a third measuring arm is pivoted to the first and second measuring arms to form a parallelogram linkage with the plate. The second, and third sides of the plate member serve as measuring sides in cooperation with the measuring arms, thereby diversifying the application of the instrument.

REFERENCES:
patent: 685372 (1901-10-01), Duncan
patent: 2090835 (1937-08-01), Gardham
patent: 2310276 (1943-02-01), Bilz
patent: 2607121 (1952-08-01), Wiedebusch
patent: 2735184 (1956-02-01), Chamberlain
patent: 3009250 (1961-11-01), Schock
patent: 4034943 (1977-07-01), Freeman

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