Control circuits for vehicle window lift mechanism

Claim 1

A control circuit for a vehicle window lift mechanism, comprising a manually operable switch having an off position and first and second operative positions, a reversible electric motor which when the switch is in its first operative position is operated in a direction to lift the window and which when the switch is in its second operative position is operated in a direction to lower the window, a limit switch which is operable in the event of an obstruction being placed in the path of movement of the window whilst the window is being lifted, means operable upon operation of said limit switch for reversing the direction of operation of the motor, even though the manually operable switch remains in its first operative position, said means incorporating a delay network whereby the motor is only operated to lower the window for a predetermined period of time , whereupon said motor stops leaving the window in a partially raised position, and circuit means operable following said predetermined period of time for preventing lifting of the window, said circuit means including the manually operable switch, so that if the manually operable switch is returned to its off position, the circuit means is broken and the window can be lifted by moving the manually operable switch back To its first operative position.