The present invention relates to a linkage mechanism, which from the second switch is in the second position while the second switch is not switched to the second is not in position the first switch has a first position, the first switch is in a first position it does not switch. And the interlocking mechanism is provided with a movable member with a notch so as to link the position of the movable member by the switching of the second switch. Moving the connection position of the movable member places the notch out of the engaged position when the switch is in position the engagement position in the notch when in the second position, the switch is not in the second position. In addition, the interlock mechanism has a load of the first switch is coupled with the notch in the movable member when in the first position, the first switch is configured to release the notch in the movable member when the switch from the first position is disposed and a. When combined with the notch of a load-moving member, the load is hayeoseo interfere with the movement of the movable member in the first direction, and prevent the second switch is switched from the second position, the notch is a combination of a movable member when it is not in position, the rod is not engaged with the notch of the first switch is prevented from being switched to the first position.
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