Patent ID: 6906310
Filing Date: 2005-06-14
Classification: G01C

Abstract:
1. A level, producing a projected plane substantially parallel to a reference plane, comprising: a housing; a light source rotatably emitting light to form the projected plane; a main shaft perpendicular to the projected plane, connecting the light source, comprising a rotary portion and a pair of protrusions; a universal joint disposed in the housing with the main shaft rotatably passing therethrough; a level sensor detecting inclination of the projected plane deviated from the reference plane and outputting an adjustment signal; and an adjustment mechanism disposed in the housing, comprising a first movable member and a second movable member crossing each other, wherein the first movable member impels one protrusion along a first axis, and the second movable member impels one protrusion along a second axis substantially perpendicular to the first axis according to the adjustment signal, whereby the main shaft is rotated around the universal joint being perpendicular to the reference plane with the projected plane parallel thereto.