Patent ID: 8281843

Claim:
An actuator mechanism for a blind having a head rail, a plurality of slats, and a bottom member the actuator mechanism comprising: a rotatable drive axle having a winding drum rotationally coupled therewith; a motor spring assembly operatively coupled with the drive axle; a raising cord having first end portion adopted to connect with the winding drum and second end portion adapted to connect with the bottom member; a ladder cord adapted to connect with the slats and operable to tilt the slats; a rotary tilt control mechanism mounted within the head rail, a portion of the ladder cord being secured thereto, the tilt control mechanism adapted to adjust the ladder cord and cause tilting of the slats; and a clutch arrangement operable to selectively engage the winding drum and the tilt control mechanism, the clutch arrangement having an engaged state and a disengaged state, wherein the tilt control mechanism is driven by rotation of the drive axle to adjust the ladder cord when the clutch arrangement is in the engaged state, and the clutch arrangement is switched from the engaged state to the disengaged state by actuation of a stop arrangement limiting vertical adjustment of the ladder cord, the stop arrangement comprising a first slat of the plurality of slats urged against a second slat of the plurality of slats, the drive axle and the winding drum rotating independent from the tilt control mechanism when the clutch arrangement is in the disengaged state; wherein the drive axle respectively receives a first torque from gravity action applied on the bottom member, and a second torque applied by the motor spring assembly opposite to the first torque; the second torque applied by the motor spring assembly being adapted to keep the bottom member in stationary equilibrium at a plurality of vertical heights, and to cause rotational displacement of the drive axle and the tilting portion to tilt the ladder cord as the bottom member is moved toward the head rail.