Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1994-09-12
1995-10-24
Fulton, Christopher W.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33295, 33371, G01C 928, G01C 936, G01C 1508
Patent
active
054599342
ABSTRACT:
A circular target type bubble level slides easily onto and off of a standard surveyor's sight rod. When slid into position at any desired elevation on the rod for optimal viewing and released, the device automatically assumes a position such that the indicating plane of the level is exactly at right angles to the long axis of the rod. When the rod is adjusted so that the bubble level indicates the true horizontal, then the rod will be plumb. The rod is received in a through hole of a rod-encircling member. A spring bias element within the hole is forced against the rod. This forces a diametrally opposed support wall portion of the member against the rod with sufficient force to hold the level at any position on the rod without operator adjustment. It also automatically positions the indicating plane of the level orthogonal to the long axis of the rod, because the bubble level element is rigidly mounted with the desired orientation relative to the support wall portion forced against the rod.
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patent: 4290207 (1981-09-01), Browning et al.
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patent: 4908949 (1990-03-01), Jaccard
patent: 4976040 (1990-12-01), Mish et al.
patent: 5207004 (1993-05-01), Gruetzmacher
patent: 5309644 (1994-05-01), Robinson et al.
Blum Alvin S.
Fulton Christopher W.
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