Safety device for vehicle door handle

1. An inertial system for a vehicle door handle of a door, said inertial system comprising:

an inertial mass driven by inertia from a rest position, in which opening of the door by the vehicle door handle is permitted, to a blocking position, in which opening of the door by the vehicle door handle is not permitted;

a blocking means that prevents the opening of the door by the vehicle door handle when the inertial mass is in the blocking position; and

an elastic means being in a minimal tensile stress state when the inertial mass is in the rest position and applies a force on the inertial mass to bring the inertial mass from the blocking position to the rest position,

wherein the inertial system further comprises a preloading mechanism that cooperates with the elastic means and includes at least two preloading states for changing the minimal tensile stress state of the elastic means.

2. The inertial system according to claim 1 , wherein the preloading mechanism comprises at least one protrusion that receives a part of the elastic means.

3. The inertial system according to claim 1 , wherein the preloading mechanism comprising a free wheel cap that is rotationally mobile with respect to a cylindrical body carrying the blocking means.

4. The inertial system according to claim 1 , wherein the elastic means comprises a coil spring having a first free end attached to a cylindrical body carrying the blocking means and a second free end attached to the preloading mechanism, wherein the minimal tensile stress state of the coil spring is defined by a relative position of the first and second free ends of said coil spring.

5. The inertial system according to claim 2 , wherein the inertial mass comprises a shoulder such that a cylindrical body carrying the blocking means and the inertial mass are rotationally coupled in a direction of the blocking position, and the at least one protrusion and a second shoulder of the inertial mass define the rest position when leaning on each other.

6. The inertial system according to claim 5 , further comprising a rotational damper that applies a force opposing the force of the elastic means when the inertial mass is returning to rest position, the rotation damper is connected to the cylindrical body and to a free wheel cap.

7. The inertial system according to claim 1 , wherein the inertial mass comprises a socket in which an additional weight can be inserted.

8. A vehicle door handle, comprising:

a lever; and

an inertial system, wherein the inertial system comprises:

an inertial mass driven by inertia from a rest position, in which opening of the door by the lever is permitted, to a blocking position, in which opening of the door by the lever is not permitted;

a blocking means that prevents the opening of the door by the lever when the inertial mass is in the blocking position;

an elastic means being in a minimal tensile stress state when the inertial mass is in the rest position and applies a force on the inertial mass to bring the inertial mass from the blocking position to the rest position; and

a preloading mechanism that cooperates with the elastic means and including at least two preloading states for changing the minimal tensile stress state of the elastic means.

9. A method to assemble a vehicle door handle, the handle comprising an inertial system according to claim 1 , the method comprising:

disposing the preloading mechanism according to a chosen preloading state of said at least two preloading states; and

installing the preloading mechanism in the vehicle door handle such that the elastic means is preloaded according to the chosen preloading state.

10. The inertial system according to claim 2 , wherein the preloading mechanism comprises a free wheel cap that is rotationally mobile with respect to a cylindrical body carrying the blocking means.

11. The inertial system according to claim 2 , wherein the elastic means comprises a coil spring having a first free end attached to a cylindrical body carrying the blocking means and a second free end attached to the preloading mechanism, wherein the minimal tensile stress state of the coil spring is defined by a relative position of the first and second free ends of said coil spring.

12. The inertial system according to claim 3 , wherein the elastic means comprises a coil spring having a first free end attached to a cylindrical body carrying the blocking means and a second free end attached to the preloading mechanism, wherein the minimal tensile stress state of the coil spring is defined by a relative position of the first and second free ends of said coil spring.

13. The inertial system according to claim 3 , wherein the inertial mass comprises a shoulder such that a cylindrical body carrying the blocking means and the inertial mass are rotationally coupled in a direction of the blocking position, and the at least one protrusion and a second shoulder of the inertial mass define the rest position when leaning on each other.

14. The inertial system according to claim 4 , wherein the inertial mass comprises a shoulder such that a cylindrical body carrying the blocking means and the inertial mass are rotationally coupled in a direction of the blocking position, and the at least one protrusion and a second shoulder of the inertial mass define the rest position when leaning on each other.

15. The inertial system according to claim 2 , wherein the inertial mass comprises a socket in which an additional weight can be inserted.

16. The inertial system according to claim 3 , wherein the inertial mass comprises a socket in which an additional weight can be inserted.

17. The inertial system according to claim 4 , wherein the inertial mass comprises a socket in which an additional weight can be inserted.

18. The inertial system according to claim 5 , wherein the inertial mass comprises a socket in which an additional weight can be inserted.

19. The inertial system according to claim 6 , wherein the inertial mass comprises a socket in which an additional weight can be inserted.