Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Module-code verification layer to automatically validate user input
Plants and seeds of hybrid corn variety CH717591
(Meth)acrylic resin composition, imidized (meth)acrylic resin composition, and film obtained by molding them
Card reader device
Developing device
Flexible pouch
Link establishment in a wireless communication environment
  Randomly Featured Patents
Pipe cutter
Rotary tubing cutter
Layer-built solid state image sensing device
Battery charger
Enclosure for electrical equipment
Vehicle wheel
Lubrication system for endless element of transfer case
Transfer roll engagement method for minimizing motion quality disturbances
Playing card holder
Thermally transferable image protective sheet, method for protective layer formation, and record produced by said method