초록 ▼

A low-profile theodolite leveling means comprises a tribrach assembly including three separate platforms of which the second is mounted upon the first by means of a pair of pivot elements which establish a first fixed axis of tilt of the second platform, and the third is similarly mounted on the sec

A low-profile theodolite leveling means comprises a tribrach assembly including three separate platforms of which the second is mounted upon the first by means of a pair of pivot elements which establish a first fixed axis of tilt of the second platform, and the third is similarly mounted on the second by means of a pair of pivots which likewise establish a second fixed axis of tilt, orthogonal to the first axis, for the third platform. Located in use between a tripod head and the base of a theodolite geodetic instrument, the tribrach assembly provides means for tilting the theodolite instrument with respect to independent planes defined by the orthogonally disposed axes of tilt and respective adjustment screw members.

대표청구항 ▼

Adjustable leveling means comprising: (a) a base platform establishing a fixed base plane; (b) an intermediate platform defining a first tilt plane mounted upon said base platform by means comprising a first pair of fixed post members terminating in substantially spherical surfaces and a pair of soc

Adjustable leveling means comprising: (a) a base platform establishing a fixed base plane; (b) an intermediate platform defining a first tilt plane mounted upon said base platform by means comprising a first pair of fixed post members terminating in substantially spherical surfaces and a pair of socket members disposed to respectively receive therein each of said spherical surfaces and form a pivot therewith, the centers of curvature of said spherical surfaces establishing a first fixed tilt axis oriented substantially parallel to said base plane and about which said first tilt plane is tiltable with respect to said base plane; (c) first adjusting means for imparting increments of tilt to said first tilt plane; (d) an upper platform defining a second tilt plane mounted upon said intermediate platform by means comprising a second pair of fixed post members terminating in substantially spherical surfaces and a pair of socket members disposed to respectively receive therein each of said spherical surfaces and form a pivot therewith, the centers of curvature of said spherical surfaces establishing a second fixed tilt axis oriented substantially orthogonal to said first tilt axis and about which said second tilt plane is tiltable with respect to said first tilt plane; (e) second adjusting means for imparting increments of tilt to said second tilt plane; and (f) means comprising said upper platform establishing a major datum plane; whereby cooperative manipulation of said first and second adjusting means will orient said major datum plane in a desired stable, fixed attitude with respect to said base plane.