Grade level

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive

Patent

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Details

33346, 33366, G01C 912

Patent

active

040633667

ABSTRACT:
A grade level comprising a hollow, fluid-tight cylindrical housing having its central axis normally disposed in a horizontal attitude. The housing comprises an annular wall portion and spaced-apart end members mounted on opposite sides thereof. A horizontally disposed shaft is mounted in the housing and extends between the end members and has a float-weight mechanism operatively rotatively mounted thereon. The mechanism comprises a float portion which extends upwardly from the shaft and a counterbalacing weight which extends downwardly from the shaft. A pair of baffles are secured to the annular wall portion at opposite sides thereof and extend substantially horizontally inwardly therefrom towards the shaft. A fluid is provided within the housing to dampen the movement of the mechanism as the housing is moved to various attitudes. A ballast material is provided in the weight portion to cause the mechanism to normally be positioned in an upright positive relative to horizontal. A sensing apparatus is provided on the housing adjacent the upper end of the float portion for sensing the movement of the mechanism relative to the housing. A read-out mechanism is operatively connected to the sensing apparatus to enable the operator to determine the grade.

REFERENCES:
patent: 1855664 (1932-04-01), Budge
patent: 2280726 (1942-04-01), Sperry
patent: 2924022 (1960-02-01), Callahan
patent: 3945391 (1976-03-01), Pearse

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