Tool for measuring angles on various articles

Details Tool for measuring angles on various articles Tool for measuring angles on various articles

1987-01-16

1988-05-17

Martin, Jr., William D.

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33427, 33536, B43L 700

Patent

active

047441526

ABSTRACT:
A protractor quadrant tool accessory is provided and consists of two arms attached pivotally together at one end, degree calibrations so that the angle between the arms is readily read and a locking device whereby the angle between the arms can be maintained fixed so that the protractor quadrant tool accessory can be used by a machinest and carpenter to measure angles on various articles. In a modification stud guides attached to outer parallel straight edges of the arms can stabilize the tool accessory when measuring the stairways stud angles and the like, used as an isometric center finder and making equal and opposite converse lines upon a stud. In still another modification an adjustable trimitre is slideably locked upon one arm so as to stabilize the tool accessory when measuring the stud angles and the like to be cut.

REFERENCES:
patent: 2448440 (1948-08-01), King
patent: 2498867 (1950-02-01), Trefz
patent: 2533890 (1950-12-01), King
patent: 3942252 (1976-03-01), Roach et al.
patent: 4641435 (1987-02-01), Brown

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