Hand-held laser surveying rod

Details Hand-held laser surveying rod Hand-held laser surveying rod

1979-10-01

1980-12-23

Stephan, Steven L.

Geometrical instruments

Straight-line light ray type

Rod or target

33296, 356152, 356400, 356401, G01B 1506, G01B 1126

Patent

active

042402085

ABSTRACT:
A telescoping surveying rod carries on its upper end a laser beam sensor which reacts to a rotating laser beam of conventional type located at a distance. The sensor preferably has a vertical, triangular cross-section piece which supports on each face three solar cells, each cell emitting a signal when the beam strikes it, depending upon whether the sensor is at above or below level. The sensor is actuated throughout 360.degree. and hence need not be pointed at the beam source. An eye level readout device on the lowermost rod section has three lights which are illuminated depending upon which cell is energized. The rod is raised or lowered until the center light is illuminated, whereupon the rod marking indicates the distance below beam level of the foot of the rod.

REFERENCES:
patent: 3819273 (1974-06-01), Unema et al.
patent: 3894230 (1975-07-01), Rordan et al.
patent: 3972622 (1976-08-01), Mason et al.
patent: 4029415 (1977-06-01), Johnson
patent: 4030832 (1977-06-01), Rando et al.

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