<p>The spiral gear has a body, a compound nut and screw on which a keyway made on its the longitudinal direction. The nut consists of four and more inserts placed in the grooves made in longitudinal direction and lean against the inclined surfaces made at different heights in the same direction on the end parts of the bottoms of the grooves. The spiral support with the conical surface placed coaxial in the hole of the body leans against the conical surfaces made on the butt-ends of the inserts from one side and from the other side the imitator with the respective conical surface. On the other butt-end of the imitator two small balls against two inclined spiral surfaces made in the direction of the screw which have the same height, and the spiral disk.</p>
