LEVELLING BOARD Russian patent published in 2010 - IPC E04F21/16 

FIELD: construction.

SUBSTANCE: levelling board includes housing made of four-sided solid hollow profile of trapezoidal cross section with working surface including straight longitudinal wedge-shaped edge, and flat rear surface with a holder in the form of a longitudinal groove. In cavity of housing there installed is slide of trapezoidal cross section similar to internal cross section of housing with possibility of restricted movement inside the housing by means of a stop rigidly fixed on one of the edges in internal cavity of housing, and axial movement with external surface relative to internal surface of housing with further outward extension to a certain mark dividing the slide into two equal parts. On rear surface of free housing end on slide extension side there installed on the axis is double-arm T-shaped fixing device with possibility of turning the plane in the plane coinciding with longitudinal housing axis about the axis perpendicular to longitudinal housing axis through an angle not more than 180° and fixing the slide on the housing in initial position and extended position and the pulling element on the slide. Pulling element has cross section similar to cross section of housing with possibility of longitudinal movement with internal surface relative to external slide surface till the edge interacts with the edge of the housing and with possibility of being fixed on the slide with double-arm fixing device correspondingly. Upper flange of double-arm fixing device in the plane of the latter is made with radius rounding. On rear surface of free housing end from the slide extension side there is a through hole coinciding with the hole made on the slide end.

EFFECT: enlarging operating capabilities, increasing serviceability owing to standardisation.

11 dwg