Patent ID: 8672274

Claim:
A locking device for crossings with movable frog points, comprising: a cradle support, said cradle support including a central recess into which a movable frog point with transverse displacement is housed to place the movable frog point in two steady end positions; a left box and a right box, said left box and said right box being fixed to the cradle support; a transverse slide coupled into said left box and said right box; a movable frog point connected through a central part of said transverse slide, a widger guided inside of said transverse slide such that axial displacement of said widger carries the transverse slide; wherein the transverse slide has an upper hollow into which locking rollers with free vertical displacement are housed; wherein skids are housed in recesses formed in the right and left boxes, and lower faces of said skids are provided with curved recesses, tops of the locking rollers being separately housed in said curved recesses at the steady end positions of the movable frog point; wherein the widger further includes depressions in which bottoms of the locking rollers are housed during relative displacement of the widger with respect to the transverse slide and also during joint movement of the widger and the transverse slide; and wherein the skids are coupled with blockage take up screws to adjust positions of the skids, in such a manner that rotation of the take up screws, respectively, carries the skids in one direction or another to fine-tune the movable frog point in the two steady end positions.