underside of the toilet seat 2 and raises the seat when the linear actuator assembly 4 is commanded to go down the straight rod 12 is retracted and the toilet seat 2 follows the seat rod 13 back to the sitting position fig3 shows the inside mechanisms of the toilet seat lift a lead screw nut 14 is bonded to the straight rod 12 a reversible dc motor 16 sits in the back actuator housing 9 and is bonded to a motor spur gear 17 the motor gear 17 turns a middle spur gear 18 which turns a lead screw spur gear 19 the lead screw gear 19 has flats that engage with flats on a lead screw 15 and turns the lead screw 15 when the motor 16 is activated the lead screw nut 14 rides up and down in the back actuator housing 9 when the lead screw 15 is actuated an infrared receiver module 23 is part of a motor controller circuit board assembly 22 the motor controller 22 receives power from the battery pack 5 the receiver module 23 waits for a signal from the transmitter assembly 6 when the toilet seat 2 is in the down position the motor controller 22 will accept only an up command upon.