Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1988-12-01
1990-04-17
Cuchlinski, Jr., William A.
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
33421, 33451, 33462, 33463, 33465, 33495, 33538, G01B 306, G01B 356
Patent
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.
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McDowell, E., Abstract of Serial No. 634,131, filed Dec. 10, 1945, published in O.G. Aug. 15, 1950.
Cuchlinski Jr. William A.
Guiterrez Diego F. F.
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