Patent ID: 8445797

Claim:
A safety interlocking device for a switch, comprising: a supporting member, configured to be arranged through a driving shaft of the switch; an annular member including a middle part with a shaft hole configured to accommodate said driving shaft of the switch, an outer periphery of the annular member coupled to a wing block; a locking lever comprising: a locking hook, a locking lever driving end, and a locking pivot shaft configured to fix onto said supporting member, the locking lever being rotatable around said locking pivot shaft and said locking hook being configured to hook on a safety device connected to said safety interlocking device; a limiting rod comprising: a limiting end, a limiting rod driving end including a groove and a limiting boss, said locking lever driving end being configured to be located in said groove upon said switch being at the turn-on position, said limiting boss being configured to abut against the outer periphery of said wing block and upon said switch being at the turn-off position, said limiting boss being configured to abut against the end face of said wing block, and a limiting pivot shaft configured to fix onto said supporting member, said limiting rod being rotatable around said limiting pivot shaft, wherein said safety device is configured to abut against said limiting end to push said limiting rod to rotate, said limiting rod driving end being configured to connect to said locking lever driving end and being configured to make said locking lever driving end move so that, upon said switch being at the turn-on position, said limiting rod driving end is configured to abut against the outer periphery of said wing block and upon said switch being at the turn-off position, said limiting rod driving end being configured to abut against the end face of said wing block; and a resilient member, one end of the resilient member being configured to connect to a limiting member disposed on said supporting member, and the other end being configured to connect to said limiting rod.