| 摘要 |
<p>A safety switch that is constructed to change over the connection contact when the actuator enters the operating portion of the switch proper and the operating rod at the switch portion moves in response to this, the actuator of which has the inserting portion to the operating portion formed with a pressurizing piece at the tip end and a supporting piece for supporting this, and to the pressurizing piece, there formed are the protruded portion pressurizing surfaces located on both end portions and the recessed portion pressurizing surface located in-between. To this operating portion, there located are a driving cam that rotates in response to the advance and retraction of the actuator, restricting plates that are located on both sides of the side of this cam and can rotate around the rotation center of the driving cam, and a cam follower pin that connects to the end portion of the operating rod and whose both ends extend to the side of the driving cam. To the driving cam, a groove cam that provides displacement in the operation rod moving direction to the cam follower pin is formed, and to each of the restricting plates, a pin engaging portion located on the cam follower pin moving passage and for restricting the move of the pin in the initial condition where the actuator is not inserted, and an elastic member for restoring the restricting plate to the initial condition, respectively, are located. And when an attempt to rotate the rotating cam only in the initial condition, the move of the cam follower pin is prevented by these restricting plates to restrict the rotation of the driving cam, and when the actuator is inserted, the driving cam is pressed with the recessed pressurizing surface of the tip end and at the same time, the restricting plates are pressed with the protruded pressurizing surfaces, and both the driving cam and the restricting plates are rotated to move the operating rod. <IMAGE></p> |
