5/17/2023 0 Comments Datum lines![]() The above and other objects and advantages and novel features of the invention will appear from the following detailed description of a preferred embodiment of the invention illustrated in the accompanying drawings wherein:įIG. The direction of the second portion of the laser beam may be simultaneously varied in a vertical plane about an angle that depends upon the dimensions of the lens aperture of the laser beam generator and upon the distance of the aperture in the reflecting surface from the laser beam generator lens. The direction of the second portion of the laser beam used as a datum line may be varied in a horizontal plane over an angle of 360°. A second portion of the downwardly directed laser beam is directed at a predetermined angle to the true vertical direction of the downwardly directed laser beam for use as a datum line, advantageous in surveying or construction operations. ![]() This first portion of the downwardly directed laser beam is used to align the laser beam generator over a known or predetermined reference point. An aperture, preferrably having a configuration of a truncated right-circular cone, is provided through the body of the reflecting surface for passing a first portion of the downwardly directed laser beam. ![]() In a preferred embodiment, the path of the downwardly directed laser beam is interrupted by a reflecting surface. That device has proven to be complex and quite unsuited for use in the rugged terrains experienced in construction and surveying operations.Īn object of the present invention is the provision of a new and improved method and means for aligning a datum line source with a known reference point.Ī further object of the present invention is the provision of a new and improved method and means for aligning a datum line source comprising a laser beam generator of the type producing a single downwardly directed laser beam over a predetermined reference point.īriefly, the above and other objects of the present invention are achieved by a datum line source comprising a laser beam generator having a single downwardly directed laser beam. That device, however, utilized a laser beam source of the type producing two oppositely directed laser beams. 7, 1969, a device is set forth that eliminates the need for a plummet in aligning a laser beam with a known reference point. Further, it is not easy to detect when a laser aligned by using a plummet becomes slightly out of alignment in response to being jarred or moved. The alignment procedure is usually quite time consuming. A plummet is characteristically used to accomplish this alignment. In surveying and most construction operations, a laser beam is usually aligned with a predetermined reference point. A properly aligned laser beam provides an extremely precise datum line over great distances. The use of a laser beam as a datum line in construction and surveying operations has become quite common. The present invention relates generally to the alignment of devices for producing datum lines and, more particularly, to the alignment of a datum line source comprising a laser beam generator for use in surveying and construction operations capable of being precisely aligned with a predetermined reference point without the use of a plummet.
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