Patent ID: 7099000

Claim:
A laser levelling apparatus including a platform, a base assembly, a body assembly, a head assembly and a laser assembly, the body assembly rotatable about a body axis relative to the base assembly, the head assembly rotatably supported by the body and rotatable about a head assembly axis transverse to the body axis, the laser assembly supported by the head assembly and rotatable about a laser assembly axis which is transverse the head assembly axis, the laser assembly having a laser diode and focussing elements and laser collimating means to collimate the laser beam with the laser assembly, the head assembly mounted between a first shaft end mounted at a first position of the body and a second shaft end mounted at a second position of the body opposed to the first position, and a head assembly collimating means to adjust the axis of rotation of the head assembly, and base assembly levelling means to adjust the level of the base relative to the platform in at least two transverse directions, wherein the base levelling, laser collimating means and head assembly collimating means together provide for collimation of the beam along three orthogonal axes.