Link 1 rotates about fixed axis x-x and has worm b which meshes with wormwheel segment 2. Segment 2 rotates about fixed axis A and, through intermediate link 6, transmits sliding motion to link 3 along fixed guide p. When adjusting link 1 is turned, wormwheel segment 2 turns about axis A and sets driven link 3 in the required position. The amount that segment 2 can be turned is restricted by means of stops 4 and nut 5 which moves along guide a in the housing.
$2251$LS,PS$