Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1988-04-04
1989-06-27
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33348, 340689, G01C 906
Patent
active
RE0329622
ABSTRACT:
A device that may be of different shapes and sizes to function as a level that emits an audio and visual signal when the device is level or parallel with gravity. It will also emit the same signals when the level is put in a vertical position and the device is plumb in one dimension; while at the same time will emit a different audio and visual signal when the level is moved and the bubble of amalgam will flow to the center of the other glass tube thus indicating that the other plane is level. In essence, both sets of signals will activate when the level is in true vertical position. The audio and visual signals are activated by D.C. current supplied by a dry cell battery. The liquid leveling agent is a drop of amalgam enclosed in a glass tube that is embedded in the body of the level. The contact points are also in the inner walls of the glass tube and traverse their circumference and at one point, they penetrate the walls of the glass tube to connect the outer surface; and are spaced the distance of the liquid amalgam when it rests in its extended state. The spaced contact points are a part of a simple open parallel circuit switch. Closing of the circuit will result when the amalgam flows to touch the contact points simultaneously when the device is level or plumb thus activating the electronic beep and the light signal.
REFERENCES:
patent: 3172212 (1965-03-01), Pappas
patent: 3786472 (1974-01-01), Scopacasa
patent: 4003134 (1977-01-01), Adams
patent: 4079521 (1978-03-01), Whorczak
patent: 4244117 (1981-01-01), Cantarella et al.
Martin, Jr. William D.
Ruano William J.
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