Lock mechanism for securing a door kinematics system and process of operating same

1. A lock mechanism for locking a door kinematics system of a door of an airplane, comprising:

a control unit,

an actuator including a rotable output shaft and a motor which rotates the output shaft for actuating a locking system,

an automatic reset device, and

a stop mechanism including a lever connected with and rotatable about an axis of the output shaft, and first and second stops between which the lever is rotatable,

wherein the control unit is adapted to actuate the actuator as a function of existence of a predetermined signal so that the actuator can bring the locking system into a locked position determined by the first stop of the stop mechanism, and

wherein the reset device is adapted to bring the locking system autonomously into a released position determined by the second stop of the stop mechanism.

2. The lock mechanism according to claim 1 , wherein the actuator comprises a brushless DC motor.

3. The lock mechanism according to claim 1 , wherein the predetermined signal is a “flight” signal of the airplane.

4. The lock mechanism according to claim 1 , and further comprising a transmission for reducing an input speed.

5. The lock mechanism according to claim 1 , wherein the automatic reset device is designed as a spring element.

6. The lock mechanism according to claim 5 , wherein the automatic reset device comprises at least two spring elements, and wherein each of the spring elements individually is in a position to bring the locking system from the locked position into the released position.

7. The lock mechanism according to claim 5 , wherein the spring element is tensioned when the locking system is brought into the locked position.

8. The lock mechanism according to claim 5 , wherein the spring element has such a restoring force that the looking system can be brought from any position into the released position within a matter of a few seconds.

9. The lock mechanism according to claim 1 , wherein the actuator acts as a braking device for decreasing speed during release of the lock mechanism.

10. The lock mechanism according to claim 1 , wherein the locking system comprises a hook and a brace element with a recess, and wherein the hook engages in the recess and blocks the door kinematics system when the locking system is in the locked position.

11. The lock mechanism according to claim 1 , wherein the control unit controls the actuator such that speed is reduced upon approaching at least one of the first and second stops.

12. The lock mechanism according to claim 1 , wherein the control unit controls the actuator such that, in the case of a suitable signal, the locking system is actively pushed in a release direction.

13. The lock mechanism according to claim 4 , wherein the transmission is a planetary gear mechanism.

14. The lock mechanism according to claim 6 , wherein each of the at least two spring elements is tensioned when the locking system is brought into the locked position.

15. A process of operating a lock mechanism for locking a door kinematics system of a door of an airplane having a control unit, an actuator for actuating a locking system, and an automatic reset device, comprising:

actuating the actuator with the control unit as a function of existence of a predetermined signal so that rotation of an output shaft of the actuator brings the locking system into a locked position,

limiting rotation of the output shaft as the locking system is brought into the locked position which is determined by way of a lever, connected with and rotatable about an axis of the output shaft, and first stop of a stop mechanism,

autonomously bringing the locking system into a released position with the reset device, and

limiting rotation of the output shaft as the locking system is brought into the released position which is determined by way of the lever and a second stop of the stop mechanism.

16. The process according to claim 15 , and further comprising decreasing speed during release of the lock mechanism.

17. The process according to claim 15 , and further comprising reducing the speed upon approaching at least one of the locked and released positions.

18. The lock mechanism according to claim 10 , wherein the hook is arranged in the recess without creating contact between the hook and the brace element when the locking system is in the locked position.

19. The process according to claim 15 , wherein the locking system comprises a hook and a brace element with a recess, and wherein the hook engages in the recess and blocks the door kinematics system when the locking system is in the locked position.

20. The process according to claim 19 , wherein the hook is arranged in the recess without creating contact between the hook and the brace element when the locking system is in the locked position.

21. The lock mechanism according to claim 18 , wherein the hook and the recess are provided with contact surfaces producing an opening torque on the hook in the absence of current supply to the motor.

22. The process according to claim 20 , wherein the hook and end the recess are provided with contact surfaces producing an opening torque on the hook in the absence of current supply to the motor.