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
Semiconductor memory device
Austenitic stainless steel welding wire and welding structure
Methods for determining decoding order in a MIMO system with successive interference cancellation
System or method to assist and automate an information security classification and marking process for government and non-government organizations for information of an electronic document
Embedded bonding pad for image sensors
Pear tree named `PremP109`
Lighting apparatus
  Randomly Featured Patents
Optical disc with wobbled tracks and apparatus using this optical disc
Method for electrically and conductively connecting two electrical lines
Gas charge container, atom probe apparatus, and method for analyzing hydrogen position in material
Process for forming a magnetoresistive sensor for a reading head
Demagnetization monitoring device for a switching power supply with a primary and a secondary regulation
Pleochroic anthraquinone dyes
Double acting door lift and closing device
Particulate tester with mixer for analytical application
Interface device for memory in a stack, storage devices and a processor
Bridge crane electric motor control system