RADIAL PLANIMETER Russian patent published in 2001 - IPC

FIELD: measurement technology. SUBSTANCE: radial planimeter is meant to determination of areas of figures of unspecified outline. It has rotary table, lever with longitudinal groove in center, counting mechanism with tracing roller put on lever and sighting device located on end of lever. Expandable lever is made of two parts. Tracing roller is mounted for reciprocating motion and interaction with friction disc on non-extensible part of level. Second half of non-extensible part carries unit transforming radial linear movements of tracing pin located on extensible part of lever to values proportional to square of these distances. Unit includes eccentric put on shaft for rotation up to one revolution as result of movement of tracing roller. Rotary table additionally carries friction disc which is coupled by means of planetary gear to gear on end of non-extensible part of lever. Outer edge of eccentric is found by calculation formula and moves tracing roller over radius of friction disc changing gear ratio when eccentric completes turn. EFFECT: increased productivity and accuracy of measurement. 5 dwg, 1 tbl