Resources Contact Us Home
Three-dimensional optical levelling, plumbing and angle-calibrating instrument

Image Number 4 for United States Patent #5539990.

An optical levelling, plumbing and angle-calibrating instrument includes: a frame; a plumb body universally pendulously mounted on the frame and defining a vertical plumb line gravitationally; at least an illuminator electrically connected to a power supply and mounted on the plumb body for emitting laser light; and at least a cylindrical-surfaced lens mounted on the plumb body in front of the illuminator for planarly diverging the laser light as emitted from the illuminator through the lens to form a laser light plane transverse to a lens axis of the cylindrical-surfaced lens, whereby the laser light plane will projectively intersect an objective wall to form a straight line of optical image, serving as a reference line for levelling or plumbing use.

  Recently Added Patents
Photovoltaic system with integrated photovoltaic panel and battery
Enhanced telephony services
Method and device for managing devices in device management system
Sampling switch circuit that uses correlated level shifting
Clusterin antisense therapy for treatment of cancer
Methods and compositions related to glucocorticoid receptor antagonists and breast cancer
Case of electronic device having antenna pattern embedded therein and mold and method for manufacturing the same
  Randomly Featured Patents
Display memory, driver circuit, display, and cellular information apparatus
Method of remote access and control of environmental conditions
Thermally-sensitive overcurrent protective relay including wire connection terminal
Rare earth boride/alumina composites and methods of making
Enhancing radar returns from targets having a small radar cross section
Single-stage implant system
Semiconductor inspection system
Remote monitoring of munition assets
Current-mirroring systems and methods
Device for holding a photoreceptor sheet