Geometrical instruments – Straight-line light ray type – Level
Patent
1980-01-31
1982-03-16
Stephan, Steven L.
Geometrical instruments
Straight-line light ray type
Level
33299, G01C 500
Patent
active
043194052
ABSTRACT:
A leveling instrument for use in the building and construction trades comprises a sighting telescope embraced by one or more support members for sighting along horizontal distances, a spirit level frame having at least one bubble level tube mounted therein for indicating the horizontal alignment of the sighting telescope, and a leveling platform having a plurality of vertically adjustable legs for leveling the instrument on a support surface. The aforementioned components are maintained in relative alignment by means of flat planar mating surfaces without rigid mechanical connection therebetween in order to facilitate rapid assembly and disassembly of the instrument and compact storage. The sighting telescope includes a pair of intersecting crosshairs which may be manually adjusted in elevation, making it possible to sight along non-horizontal lines without physically tilting the leveling instrument as a whole. Each of the vertically adjustable legs of the instrument comprises an externally threaded shaft which engages the open end of an internally threaded tubular member, the latter being removably received in a tubular furrow member permanently embedded in the leveling platform. The sighting telescope support members are characterized by a two-part construction with fastener-recessing cavities in the base section thereof, thereby providing a substantially unobstructed flat planar base surface portion for resting smoothly on the spirit level frame.
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Handy Level Sights Made from Small G Clamps, Popular Mechanics, Mar. 1946, p. 227.
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