Geometrical instruments – Straight-line light ray type – Rod or target
Patent
1980-02-13
1982-08-24
Stephan, Steven L.
Geometrical instruments
Straight-line light ray type
Rod or target
33296, G01C 1502, G01C 1506
Patent
active
043453821
ABSTRACT:
Apparatus for use in setting and checking grades in construction of roads, parking lots, building, or the like comprising a level support in combination with a level rod wherein the level support has a nominal length of X plus Y, for example, the level rod includes a zero mark above which are plus (+) graduations in terms of a principal dimension and a subordinate dimension below which are minus (-) graduations in terms of the principal and subordinate dimensions down to a length of X according to the principal dimension and a leg member adustably secured to the rod, the leg member having a foot portion extending below the lower end of the rod, the leg member being adjustable so that the foot portion may be selectively set to extend below the lower end of the rod for a minimum distance of Y according to the subordinate dimension or more as desired, whereby the zero mark may be selectively set at a distance equal to the nominal length of X plus Y above the lower end of the foot portion so that in use of the apparatus the zero mark of the level rod corresponds to the height of the level support.
REFERENCES:
patent: 269254 (1982-12-01), Bean
patent: 311221 (1885-01-01), Bean
patent: 826246 (1906-07-01), Halversen
patent: 1165820 (1915-12-01), Watson
patent: 3460260 (1969-08-01), Sarlandt
patent: 3487550 (1970-01-01), Herman et al.
patent: 4060909 (1977-12-01), Collins et al.
Stephan Steven L.
Wong James A.
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