Apparatus for determining a level surface

Geometrical instruments – Straight-line light ray type – Horizontal angle measurer

Reexamination Certificate

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Details

C033S286000, C033S227000, C033S451000

Reexamination Certificate

active

06912792

ABSTRACT:
An apparatus for determining a level surface includes a housing having a plurality of apertures and a power supply source disposed therein. A plurality of laser beam supply sources are operably controlled by the plurality of switches. A plurality of reflecting members spaced from the plurality of laser beam supply sources and receive a plurality of laser beams having respective first paths and reflect same away in corresponding second paths. A plurality of angle-adjusting members receive the plurality of laser beams and direct same along a third path and out of the housing via the plurality of apertures, respectively. A plurality of control dials are operably connected to the plurality of angle-adjusting members for positioning same to thereby establish the respective third angles of the plurality of laser beams. A plurality of leveling devices are attached to the housing and help position the apparatus at a substantially level position.

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