a switch mechanism includes a support structure and an electric switch having an activator moveable between a first position where the electric switch is on and a second position where the electric switch is off . a cam is connected to a first actuator , moveably mounted on the support structure , so that movement of the first actuator results in movement of the cant a bar is connected to a second actuator , moveably mounted on the support structure , so that movement of the second actuator results in movement of the bar . the cam engages the activator so that movement of the cam by movement of the first actuator results in the activator moving between its two positions . the bar engages the activator so that movement of the bar by movement of the second actuator results in the activator moving between its two positions .