Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1985-09-24
1986-12-02
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 906
Patent
active
046254234
ABSTRACT:
A bar for measuring angles of inclination from the vertical and horizontal. The angles of inclination are indicated by either sight, sound, or feel or combinations thereof. Light emitting diodes and photo transistors are positioned on opposite sides of a sealed tube containing an opaque or clear liquid whereby the absence of light or the amplification of light intensity at the photo transistor senses an angle of inclination. Either multiple pairs of light emitting diodes and photo transistors are utilized for sensing a plurality of different angles of inclination or a single light emitting diode with a plurality of fiber optic cables leading therefrom with the ends of each opposing, a separate photo transistor. Visual indication of angles of inclination are provided by light emitting diodes associated with each photo transistor or other digital readout indicators, the sound is provided by a buzzer or the like and the feel is provided by a vibrator. The audio and vibrator indicators can be selectively turned on or off. The power to the detecting, visual, audio and vibrator is automatically removed when the device is not in use when placed in a selected position.
REFERENCES:
patent: 3786472 (1974-01-01), Scopacasa
patent: 3813556 (1974-05-01), Beer et al.
patent: 3861052 (1975-01-01), Siegfried
patent: 4003134 (1977-01-01), Adams
Gilliam Frank D.
Little Willis
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