DEVICE TO SET LASER REFERENCE PLANE Russian patent published in 2002 - IPC

FIELD: geodetic instrumentation. SUBSTANCE: device is intended for pegging-out operations during assembly of prefabricated building structures and for planning operations over large areas. Device incorporates two pairs of rotary levers, two sector gears, vertical wheel, worm, reference member carrying cylindrical casing with laser, collimator, electric motor and pentaprism. Reference member has base with vertical immobile guides and two side supports. Cylindrical casing has protrusion and immobile guides. Two carriages are mounted on surface of cylindrical casing for rolling over in immobile guides and spring that rests against protrusion and first carriage. Roller is mounted on end of cylindrical casing for rolling over vertical circular guides. Two pairs of rotary levers are fixed with one end and can rotate on side supports and they are hinged with the other end to proper carriages. Lengths of rotary levers are equal to distances from center of pentaprism to rotation axis of each lever. Sector gears are put on rotation shafts of first and second pairs of rotary levers. Worm is anchored on side support for interaction with both gears. Vertical wheel is set on rotation axis of one of gears. EFFECT: increased productivity and accuracy of results of constructing and expansion of angular range of specified inclines planes. 4 dwg, 1 tbl