Abstract: A transmission mechanism comprises a rotating shaft, a main column, a rotating column, a stick, a spring and a fixed column. The main column has a first axle hole receiving the rotating shaft. End of the main column has an O-shaped trench having a stop within. The rotating column fixed with the rotating shaft has a through hole between its first end and second end. The stick is plugged into the through hole. The fixed column fixed with the toilet has a third axle hole receiving the rotating shaft. The fixed column has a C-shaped trench having a deep first terminal and a shallow second terminal. The spring is disposed to enclose the stick and is for elastically protruding the stick out the first end or the second end to insert the C-shaped trench or the O-shaped trench.