Illuminated level

Details Illuminated level Illuminated level

1984-03-27

1985-03-26

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33348, G01C 906

Patent

active

045064504

ABSTRACT:
A precision level embodying solid state electronics is disclosed. A level body portion contains chambers for paired light emitting diodes operable to indicate angular deviations from true horizontal and true vertical over desired ranges. A mercury droplet in each compartment is in contact with an arcuate conducting strip leading to a battery terminal of one polarity. Upon angular displacement of the level, the mercury droplet sequentially contacts light emitting diode leads of like polarity. The light emitting diode leads of opposite polarity are connected through a common conductor element and an on-off switch of the level to a battery terminal of like polarity. The same switch is operably connected with the groups of light emitting diodes used to indicate angular deviations from the true horizontal and true vertical. The light emitting diodes may be embedded in a clear transparent medium or in variously colored translucent elements.

REFERENCES:
patent: 2338811 (1944-01-01), Hasbrook
patent: 3166855 (1965-01-01), Erritt
patent: 3271650 (1966-09-01), Riddle

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