Patent ID: 7343633

Claim:
A transmission mechanism for lifting a toilet seat automatically on a toilet by a motor, comprising: a rotating shaft, driven by the motor; a main column, having a first axle hole for receiving the rotating shaft, the toilet seat connected outside with the main column, wherein at least one end of the main column has an O-shaped trench, a stop disposed within the O-shaped trench; at least one rotating column, having a second axle hole for receiving and fixing with the rotating shaft, the rotating column having a first end and a second end and at least one through hole between the first end and the second end, wherein the first end is adjacent to the main column, wherein the through hole is divided into a thin hole near the first end and a thick hole near the second end; at least one stick, comprising a thick stick and a thin stick, the stick plugged into the through hole; at least one spring, disposed in said thick hole and enclosing the thin stick, wherein a radius of the thin hole is smaller than the spring and the thick stick; and at least one fixed column, fixed with a main body of the toilet, the fixed column having a third axle hole disposed at its axle center for receiving the rotating shaft, the second end of the rotating column being adjacent to the fixed column, wherein the fixed column has a C-shaped trench for receiving the thick stick, the C-shaped trench having a first terminal and a second terminal, deepness of the C-shaped trench becoming shallower from the first terminal to the second terminal.