Device for holding a surveyor's range pole

Geometrical instruments – Straight-line light ray type – Rod or target

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Details

G01C 1508

Patent

active

043566375

ABSTRACT:
A device for holding a surveyor's range pole in a vertical position. The pole is held rigid relative to a tripod base by a single bracket. The bracket is seated on the apex of the tripod and includes a collar member attached to an underlying three channel frame. Three horizontally disposed screws thread through the three channeled frame to mutually engage a range pole at the center of the collar.
Additionally, an extension arm may be secured to the top of the collar by means of an overlying pressure plate. The extension arm lies between two upright screws which pass through the pressure plate, and pressure is exerted on the extension arm by tightening wing nuts over the screws. The range pole is secured beyond the rim of the collar by passing it through a teardrop shaped aperture in the extension arm and pressing the pole against the edges of the teardrop shaped aperture by an adjustable screw threaded through the extension arm. A ring member similar to the collar member can be used in place of the teardrop shaped aperture as an alternate means of securing the range pole to the end of the extension arm.

REFERENCES:
patent: 494876 (1893-04-01), Merrill
patent: 1036096 (1912-08-01), Graves
patent: 2245901 (1941-06-01), Chaskin
patent: 2835975 (1958-05-01), Zimmerman
patent: 3077035 (1963-02-01), Hackney
patent: 3195234 (1965-07-01), Glidden
patent: 3314068 (1967-04-01), Verive

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