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Automatic plumb and level tool

  • US 5,075,977 A
  • Filed: 10/22/1990
  • Issued: 12/31/1991
  • Est. Priority Date: 10/22/1990
  • Status: Expired due to Term
First Claim
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1. A portable laser beam projecting device for indicating level, plumb and alignment, comprising,a hand carryable housing having at least two sides capable of resting stably on a flat surface, the two sides being substantially perpendicular to each other,laser source means mounted within the housing, for producing at least one collimated beam of visible laser light,a laser beam exit window in the housing,beam directing means in the housing for directing a beam from the laser source means vertically out of the housing through the exit window when a first side of said two sides is held generally horizontal, and for directing a beam from the laser source means horizontally out of the housing through the exit window when a second side of said two sides is held generally horizontal, andtilt compensation means in the housing and associated with the beam directing means for correcting for relatively small tilt angles of the housing as it rests with one of said two sides against surfaces not truly horizontal or not truly vertical, and for projecting the beam through the exit window in substantially true vertical orientation or substantially true horizontal orientation despite such relatively small tilt angles.

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