Back-up brake system of lifts

A back-up brake system of lift is positioned on the lift car, which is inclusive of a back-up safety cable, guiding wheels and a brake and is characterized in that:

• four guiding wheels are mounted at the four corners of the lift car;
• the upper end of the back-up safety cable is fixed at the lift shaft way top perpendicular to the guiding wheel at the upper right corner of the lift car, runs successively through the guiding wheels at the upper right corner, the upper left corner, the lower left corner and the lower right corner and then its lower end is connected with the extension spring at the shaft way bottom which is perpendicular to the guiding wheel at the lower right corner;
• the brake is mounted in the middle of the car bottom, which is inclusive of hydraulic wrenches and gear rope grippers;
• the hydraulic wrenches run through the rope grippers and drive them to turn, while the back-up safety cable runs through the opening on the rope grippers, which the gear rope gripper in the upper and lower rows, turn in different directions to seize the back-up safety cable.