LEVELLING SYSTEM AND LEVEL DETECTOR

摘要

A levelling system for a surface comprises a number of motor operated means to lift the surface, preferably four in number, one at each corner. One or more of the lifting means is actuated by a level detector mounted on or parallel to the surface. In one embodiment the level detector comprises a pendulum and a number of proximity switches spaced thereabout, each adapted to operate a respective lifting means when approached by the pendulum.