초록 ▼

A tool for use in establishing a precise level line or plumb line or line for alignment uses a visible laser diode for projecting the line. The tool is relatively small and compact, drives the laser diode using batteries contained in the tool, and includes tilt compensation for use on surfaces which

A tool for use in establishing a precise level line or plumb line or line for alignment uses a visible laser diode for projecting the line. The tool is relatively small and compact, drives the laser diode using batteries contained in the tool, and includes tilt compensation for use on surfaces which are not level, up to about 5°off level, for still delivering a truly plumb or truly horizontal beam. A manual selector device is provided for shifting the beam from a vertical orientation to a horizontal orientation when desired. Specific forms of tilt compensation apparatus are disclosed.

대표청구항 ▼

A device for projecting a plumb line, a level line or an alignment line, comprising, a housing capable of being placed on a generally horizontal surface, laser diode means for emitting a visible laser beam, mounted within the housing, battery means contained within the housing, for powering the lase

A device for projecting a plumb line, a level line or an alignment line, comprising, a housing capable of being placed on a generally horizontal surface, laser diode means for emitting a visible laser beam, mounted within the housing, battery means contained within the housing, for powering the laser diode means, optical means for receiving the light from the laser diode and delivering a collimated light beam out of the housing, generally vertically upwardly, compensator means associated with the laser diode means and the optical means, for correcting for small tilt angles of the housing placed on said generally horizontal surface and for assuring that the beam from the optical means is oriented substantially vertically in spite of such small tilt angles, a reference marker means associated with the housing, visible to a user when the housing rests on said surface and located near the bottom of the housing, for aligning the vertical light beam with a desired position on said surface, and reflector means within the housing for redirecting said substantially vertical light beam, to a substantially horizontal orientation when desired, including manual selector means on the outside of the housing for permitting the user to redirect the beam horizontally when desired.