Geometrical instruments – Indicator of direction of force traversing natural media – With viewing aid
Patent
1975-08-06
1977-01-18
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
With viewing aid
33366, 33399, G01C 906
Patent
active
040031349
ABSTRACT:
An automatic lighted level and a angle finder has a frame provided with a planar surface arranged for abutting against an object the orientation of which is to be determined or adjusted. An electrically energized visual indicator is mounted in the frame of the device for indicating when the planar surface of the frame is oriented at a predetermined angle by the closing of an angle-sensing switch including a reel assembly adjustably mounted in an opening provided in the frame and connected to the indicator and to a source of electrical power for energizing the indicator by closing an electrical circuit connecting the indicator to the source of electrical power when the switch is rotated relative to the frame to an angle corresponding to the angle of an object whose angular orientation is being determined. Alternatively, the planar surface may be placed on the object and the latter moved until its orientation corresponds to a predetermined angle set on the switch. A circular scale graduated in degrees cooperating with a pointer provides a visual indication of the angular setting of the switch.
REFERENCES:
patent: 1901793 (1933-03-01), Allen
patent: 2892260 (1959-06-01), Mozur
patent: 3196552 (1965-07-01), Richards
patent: 3233235 (1966-02-01), Wright
patent: 3584387 (1971-06-01), Sturm
patent: 3861052 (1975-01-01), Siegfried
Jacobson Harvey B.
Martin, Jr. William D.
O#Brien Clarence A.
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