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Three-dimensional optical levelling, plumbing and angle-calibrating instrument

DC
  • US 5,539,990 A
  • Filed: 05/30/1995
  • Issued: 07/30/1996
  • Est. Priority Date: 05/30/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. An optical levelling, plumbing and angle-calibrating instrument comprising:

  • a frame;

    a plumb body universally pendulously mounted on the frame and defining a vertical plumb line gravitationally;

    an illuminating means electrically connected to a power supply means and mounted on the plumb body for emitting laser light; and

    a cylindrical-surfaced lens means mounted on said plumb body in front of said illuminating means and having a lens axis projectively perpendicular to the laser light emitted from said illuminating means for planarly diverging the laser light as emitted from said illuminating means through said lens means to form a laser light plane transverse to a lens axis of said cylindrical-surfaced lens means, said laser light plane projectively intersecting an objective wall to form an optical image line, said illuminating means and said lens means operatively projecting a first laser light plane projectively perpendicular to the vertical plumb line of the plumb body to intersect the objective wall to form a horizontal straight line of optical image for levelling; and

    said illuminating means and said lens means operatively projecting a second laser light plane projectively perpendicular to said first laser light plane to intersect the objective wall to form a vertical straight line for plumbing.

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