Emergency stop apparatus for elevator

An emergency stop apparatus for an elevator which is vertically movable along a guide rail installed vertically to a wall of hoist way in a building, comprising:

• a pair of wedge means for stopping the elevator by constricting the guide rail when the elevator moves in excess speed;
• a flexible cable, one end of which is combined with one of the wedge means, the other end of which is combined with the other one of the wedge means, the flexible cable drawing the wedge means upward when the elevator moves in excess speed;
• cam means having a rotary shaft engaged with the flexible cable, the cam means drawing the cable upward when the elevator moves in excess speed;
• a disk roller which rides and rolls on the guide rail on the center of a rotary shaft thereof when the elevator moves, the disk roller receiving pressure from the cam means toward the guide rail when the elevator moves in excess speed;
• a centrifugal weight rotating the cam means when the elevator moves in excess speed;
• and
• a spring, one end of which is fixed to the rotary shaft of the disk roller, the other end of which is fixed to the centrifugal weight, the spring biasing the centrifugal weight to come in contact with the cam means when the elevator moves in excess speed.