Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1976-12-20
1978-03-21
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 906
Patent
active
040795217
ABSTRACT:
An electrically actuated level having a housing with a straight edge for providing a visual signal to indicate either a horizontal or vertical orientation of said straight edge or for indicating a deviation therefrom and the direction of said deviation. The level also comprises a rotatable means mounted in the housing. Liquid contact switching means are mounted in the rotatable means generally parallel to a first axis thereon. The rotatable means is arranged to be pivoted from a first position through 90.degree. to a second position and vice versa and to be locked in either of said positions to enable said first axis of the rotatable means to be brought into a generally horizontal orientation irrespective of whether the straight edge of the level is oriented generally horizontally or vertically. The level also includes an electric power source means and light-emitting means connected to said power source means and said liquid switch means. Main off/on switch means are provided to enable said power source means whenever said rotatable means are in said first or said second position. The liquid switch means are positioned on the rotatable means such that when said first axis is disposed horizontally the switches complete a first circuit to provide a first light to indicate that the straight edge is in the desired horizontal or vertical orientation. When the left side of the rotatable means is disposed below the right side the switches complete a second circuit to provide a second light and when the right side of the mounting means is disposed below the left side the switches complete a third circuit to provide a third light. The first light is one color and the second and third lights are a second color.
REFERENCES:
patent: 2511525 (1950-06-01), Bradwell et al.
patent: 3657695 (1972-04-01), Birmingham
patent: 3861052 (1975-01-01), Siegfried
patent: 4003134 (1977-01-01), Adams
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