Illuminated level

Details Illuminated level Illuminated level

1990-04-12

1991-06-04

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

With viewing aid

33379, G01C 932

Patent

active

050202324

ABSTRACT:
The bubble vials of a carpenter's level are individually illuminated by a respective light emitting diode (LED) energized from a battery supported within the body of the level. Charge on the batteries is maintained by one or more solar cells mounted on an exterior surface of the body, and the LED's are energized by a control circuit including a normally open manually actuable switch and a pair of mercury switches supported within the body at different fixed orientations relative thereto such that one of them closes when the body is horizontally oriented to apply voltage to the LED for the horizontal bubble vial, and the other closes when the body of the level is vertically oriented and connects the battery to the LED for the bubble vials of the plumbing levels. Thus, the circuit automatically illuminates only the bubble vial, or vials, that need to be illuminated in order to observe the position of the bubble for the orientation selected by the user.

REFERENCES:
patent: 970729 (1910-09-01), Lingle
patent: 3166855 (1965-01-01), Erritt
patent: 3584212 (1971-06-01), Hansen

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