Mechanical interlocking device for combined switch apparatus

The invention relates to a mechanical interlocking device for combined switch apparatus. The interlocking device comprises an interlocking mechanism I, an interlocking mechanism II and an interlockingmechanism III which are connected together through four cables; the interlocking mechanism I and the interlocking mechanism III are symmetrically arranged at two opposite ends of the interlocking mechanism II respectively; one end of a cable I and one end of a cable II are connected with the interlocking mechanism I, and the other ends are connected with the interlocking mechanism II; one end ofa cable III and one end of a cable IV are connected with the interlocking mechanism III, and the other ends are connected with the interlocking mechanism II; the interlocking mechanism I and the interlocking mechanism III have completely identical structures and have the structures different from that of the interlocking mechanism II located in the middle; the four cables are all composed of outerpipes and inner wires. As