Illuminated spirit level

Details Illuminated spirit level Illuminated spirit level

1983-08-29

1984-11-27

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

With viewing aid

33366, 33384, G01C 906

Patent

active

044843933

ABSTRACT:
An illuminated spirit level comprises a bubble tube mounted in a support body with light source shielded to define two light paths directed through the bubble tube to apertures on the outside of the support body so that with the bubble positioned centrally the light is communicated directly from the light source through the bubble tube to the apertures. On movement of the bubble relative to the bubble tube caused by inclination of the spirit level, the bubble intercepts one of the light paths so as to cause refraction directing the light away from the aperture. The different refraction is caused by the difference in shape between the lower surfaces of the bubble and the upper surface of the bubble tube. The curvature of the bubble causes the edge to totally reflect the light path to divert the light.

REFERENCES:
patent: 2993281 (1961-07-01), Dock
patent: 3299523 (1967-01-01), Lea
patent: 4154000 (1979-05-01), Kramer

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