Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1984-10-02
1985-07-09
Ward, Robert S.
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
33 25R, 33461, B43L 706
Patent
active
045273413
ABSTRACT:
An angle determinator comprises four hingedly interconnected links. These links form jointly a parallelogram having its apexes constructed as pivot joints. At one of the apexes of the parallelogram the links are rotatably connected to a bar which is provided with a scale. Along this scale that apex of the parallelogram which is opposite to said one apex is displaceable together with a pointer cooperating with said scale. To make possible quick and handy determination not only of such "concave" or "open" angles as are defined by two planes, e.g. a floor and a wall or a wall and a ceiling, but also of "convex" or "solid" angles, i.e. angles in which only the outside of the planes defining the angle is accessible to the angle determinator, one of the links of the angle determinator forming the angle of the parallelogram at said opposite apex constitutes an integral portion of a substantially straight rod which together with said bar forms an angle which is half as wide as the angle of the parallelogram at said first apex.
REFERENCES:
patent: 451810 (1891-05-01), Cowgill
patent: 541514 (1895-06-01), Walker
patent: 742528 (1903-10-01), Traut
patent: 797453 (1905-08-01), Nagel
patent: 925807 (1909-06-01), Green
patent: 956356 (1910-04-01), Humbert
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