Cable tensioning device

PURPOSE: To enable a cable tensioning device for elevators to compensate the elongation of a cable caused by the operations of an elevators within a closed cable system, to minimize the force to be applied to the cable, and to secure a cable tension ratio required for maintaining the driving capacity. CONSTITUTION: This cable tensioning device comprises a rocker 20 configured as a lever and supported at the counterweight 13 or the elevator cab 12. A support cable 11 and a drive cable 10 are fastened to the rocker 20 to be spaced from each other. The spacing ratio of the attachment points of both cables at the rocker 20 from the support point 21 of the rocker 20 at the counterweight or the elevator cab is designed to define the cable tension ratio for the driving capacity.