ApplicationNo. 581237 filed on 09/12/1990
US Classes:356/250, Pendular suspension of optical element or reticle33/291, Self leveling356/138ANGLE MEASURING OR ANGULAR AXIAL ALIGNMENT
ExaminersPrimary: Turner, Samuel A.
Attorney, Agent or Firm
International ClassG01C 009/12
AbstractA simple structure for providing a level laser beam. A pendulum is suspended by at least two suspension supports along the line parallel to a path of a laser beam emitted from a laser. An optical element is mounted on the pendulum to intercept the laser beam and reflect it along a path orthogonal to the first path. The pendulum will maintain the optical element in a vertical alignment, and accordingly the beam reflected off the optical element will be horizontal.
Field of SearchArtificial reference
Pendular suspension of optical element or reticle
ANGLE MEASURING OR ANGULAR AXIAL ALIGNMENT
Measurement in two planes (e.g., azimuth and elevation; hour angle and declination)
Vertical and horizontal angle measurer
Having gravity responsive indicating means (e.g., pendulum, etc.)
Level (i.e., surveyor's type)
With leveling or plumbing adjunct