TRISECTOR Russian patent published in 2010 - IPC B43L9/08 B43L13/00 

FIELD: instrument making.

SUBSTANCE: invention relates to office equipment intended for graphic works in geodesy, mathematics and geometry, and can be used, primarily, at home, in educational centers, construction and the like, where graphic works are required. Angle trisector intended for accurate division of flat angles of 0° to 180° into three equal parts comprises two equal parallel half-circles connected by six equal lateral sides hinged to said half-circles. Three pairs of lateral sides form lateral sides of isosceles triangles with their apices belonging to upper half-circle and represent ball joint sliding on over upper half-circle. Apices of angles at the base of adjacent isosceles triangles located on lower half-circle are interconnected by ball joins. Lower half-circle center is connected with attachment points of outer lateral sides. Proposed trisector incorporates a device designed to move upper half-circle in parallel to lower half-circle.

EFFECT: accurate division of flat angles with no additional tools or graphing.

2 cl, 1 dwg