A DEVICE FOR PORVIDING CENTERLINES IN A CONTINUOUS MANNER DURING CONSTRUCTION IN UNDER GROUND MINES/TUNNELS

摘要

In the device of the present invention for providing centerlines in a continuous manner during construction in underground mines / tunnels, there is provided in combination a four-arm mounting unit with four numbers laser beam-emitting diodes and lenses capable of emitting laser beam in a single or in a parallel plane in four predetermined directions, such as 0°, 90°,180° and 270°, wherein the 180° arm being capable of rotation. This combination being housed in an anti-static housing with appropriate openings and the housing being provided with means for adjustable and movable ceiling mounting. The device of the present invention is useful for marking center lines and other survey lines in a continuous manner in a number of faces of a working in underground mine or tunnels. This device can emit four lines in a same or parallel plane at a time. The device is light, easily transportable, re-installable and adjustable to meet the survey line requirement in a mine or a tunnel. This will eliminate the requirement of manpower to do the line marking jobs in every shift.