Actuator assembly for locking devices

An actuator assembly for a locking device, comprising:

• a motor,
• a drive shaft installed to the motor shaft, and
• a coil spring installed to the drive shaft, characterized in that the actuator assembly further comprises:
• a follower shaft capable of displacing in an axial direction in the coil spring, and
• a pin installed onto the follower shaft and rotatable into the coil spring, and the follower shaft is extended into the coil spring and slidably fitted to the coil spring;
• wherein the coil spring is a cylinder spring comprising a rotating-in portion and a buffering portion,
• the pin displaces axially within a range of the rotating-in portion,
• the cylinder spring has a first fixing ring and a second fixing ring installed at two free ends of the cylinder spring respectively, a first U-shaped bend coupled to the first fixing ring, and a second U-shaped bend coupled to the second fixing ring,
• the drive shaft has a ring-shaped protruding strip formed thereon, and the ring-shaped protruding strip comprises a protruding strip head matched with the first U-shaped bend, and the first U-shaped bend is sheathed on the protruding strip head, and the first fixing ring is installed to the outer side of the ring-shaped protruding strip.