Levelling and transit system

Details Levelling and transit system Levelling and transit system

1995-03-02

1996-05-28

Fulton, Christopher W.

Geometrical instruments

Straight-line light ray type

Level

33281, 33451, 33DIG21, G01C 900, G01C 500

Patent

active

055199429

ABSTRACT:
A device for performing levelling and transit functions is disclosed herein having an elongated member with parallel spaced-apart top and bottom flat surfaces separated by a thickened web. The web includes several cutouts exposing bubble indicators arranged in a variety of orientations and includes a rotary module at one end movably mounting a laser beam generator. The module has a passageway conducting a laser beam to a selected one of several slots or passageways provided in the end of the member in response to manual rotation of the module by the user whereby the beam exits the device in a linear path. The web includes a housing adjacent to the module enclosing electrical circuits, battery power supply and button controls for operation of the laser. A pivoting panel is coextensive with the top flat surface in a stored position while pivotal to a position normal to the top flat surface when used as a corner square. A thumb adjustment screw protrudes from the web through a flat surface to angle the device if desired.

REFERENCES:
patent: 662991 (1900-12-01), Van Luvan
patent: 739242 (1903-09-01), Weber
patent: 2570430 (1951-10-01), Cramer
patent: 3225451 (1965-12-01), Olexson et al.
patent: 3897637 (1975-08-01), Genho
patent: 4912851 (1990-04-01), Rando et al.
patent: 5394616 (1995-03-01), Claxton
patent: 5442864 (1995-08-01), Erman

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