Electronic signaling level

Details Electronic signaling level Electronic signaling level

1983-05-31

1986-01-21

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33344, 33402, 340689, G01C 906

Patent

active

045650101

ABSTRACT:
An angular orientation detector and indicator has a plumb bob suspended in a vertically extending chamber of a housing. A beam of radiation is emitted across the chamber from a beam emitter to a beam receiver and the plumb bob is swingable through a beam path extending between the emitter and receiver. When the housing of the detector is positioned in a preselected angular orientation the plumb bob comes to rest blocking the beam path to substantially reduce or prevent the radiated beam from being received by the receiver. An electrically actuated signal, such as an audible or visual signal, or both, is thereby actuated to indicate that the detector is at a preselected angular orientation. Such detectors may be mounted on builder's levels to indicate when the level is in a preselected angular orientation, such as a horizontal or vertical orientation. Other embodiments and useful applications of such detectors are also disclosed.

REFERENCES:
patent: 723526 (1903-03-01), Hein
patent: 3359550 (1967-12-01), Christensen
patent: 3657551 (1972-04-01), Lingert et al.
patent: 4159577 (1979-07-01), Bergkvist
patent: 4253242 (1981-03-01), McInerney
patent: 4375727 (1983-03-01), McAdams

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