Brake for injection devices

1. A brake mechanism for an injection device for generating a damping effect on a rotating part of the injection device, the brake mechanism comprising:

a brake disc and at least one complementary element by cooperation of which the brake mechanism generates the damping effect on the rotating part, wherein

the rotating part may rotate at a higher speed and a lower speed, and wherein

the damping effect is greater at the higher speed than at the lower speed.

2. The brake mechanism as claimed in claim 1 , wherein the rotating part is at least one of a threaded rod, a sleeve, a display barrel, a drive shaft, a threaded sleeve, a brake shoe or a part connected to or coupled therewith.

3. The brake mechanism as claimed in claim 1 , wherein the brake disc acts as a friction brake in conjunction with the at least one complementary element.

4. The brake mechanism as claimed in claim 1 , wherein the brake disc comprises a profile on one side or on both sides and extending partly or completely around the circumference.

5. The brake mechanism as claimed in claim 4 , wherein the at least one complementary element of the brake disc comprises a complementary profile.

6. The brake mechanism as claimed in claim 5 , comprising more than one complementary element, and the complementary elements are fixedly connected to one another and the complementary profiles are spaced apart from one another by a distance which is the same as or bigger than a profile depth of the profile of the brake disc.

7. The brake mechanism as claimed in claim 1 , wherein the brake disc is nonrotatable and axially displaceable and the at least one complementary element is rotatable.

8. The brake mechanism according to claim 1 , wherein the rotating part continues to be rotatable whether the damping effect is generated at the higher speed or at the lower speed.

9. A damping mechanism for an injection device for generating a damping effect on a rotating part of the injection device, the damping mechanism comprising a brake disc and at least one complementary element by cooperation of which the damping mechanism generates the damping effect on the rotating part, wherein the brake disc comprises an annular body and wherein the brake disc and the at least one complementary element each comprise a plurality of complementary teeth, each tooth having a tip shaped to ease relative rotation of the brake disc and the at least one complementary element.

10. The damping mechanism according to claim 9 , wherein the damping effect does not stop the rotation of the rotating part.

11. The damping mechanism according to claim 9 , wherein the tips are flattened.

12. The damping mechanism according to claim 9 , wherein the rotating part may rotate at a higher speed and a lower speed, and wherein the damping effect is greater at the higher speed than at the lower speed.

13. The damping mechanism according to claim 12 , wherein the injection device receives a cartridge or ampoule, and the damping effect takes place when the cartridge or ampoule is not received in the injection device.

14. A damping mechanism for an injection device for generating a damping effect on a rotating part of the injection device, the damping mechanism comprising a brake disc and at least one complementary element by cooperation of which the damping mechanism generates the damping effect on the rotating part, wherein the brake disc comprises an annular body and wherein the brake disc and the at least one complementary element each comprise a plurality of complementary teeth, the teeth having a shape to ease relative rotation of the brake disc and the at least one complementary element, the shape comprising a flattened region between each tooth and each tooth having a flattened tip.