Device for unlocking the rotation of a crash-helmet chin guard

1. A releasing device for enabling rotation of a chin guard, hinged to the sides of the cap of a crash helmet, in particular for motor-cyclists, of the type which comprises at least one engagement/release mechanism for engagement/release of the chin guard with respect to the cap, first actuation means of said at least one engagement/release mechanism, and second inhibition means for inhibiting release, said first and second means being actuatable by a user, said device being characterized in that said second means prevent, when not actuated by the user, operation of said first actuation means and/or of said at least one engagement/release mechanism.

2. The device according to claim 1 , characterized in that said first means comprise at least one control element, which can move between a position of actuation of said at least one engagement/release mechanism and an inoperative position with respect to said engagement/release mechanism, and in that said second means prevent, when not actuated by the user, displacement of said control element from said inoperative position to said position of actuation of the engagement/release mechanism.

3. The device according to claim 1 , characterized in that said second inhibition means comprise at least one removable arrest, which engages, by interposition of parts, said first actuation means and/or said engagement/release mechanism.

4. The device according to claim 2 , characterized in that said arrest can move between a position of engagement with said control element and a position of disengagement from the latter.

5. The device according to claim 3 , characterized in that said second inhibition means comprise a two-armed lever, one of the two arms being equipped with, or coinciding with, said arrest.

6. The device according to claim 5 , in which said lever is mounted elastically on said chin guard or on said cap.

7. The device according to claim 1 , characterized in that said first actuation means are equipped with at least one control element consisting of a slider translatable along a given path (B).

8. The device according to claim 7 , characterized in that said slider is slidably mounted on said chin guard or on said cap.

9. The device according to claim 7 , characterized in that said slider is mounted on said chin guard or on said cap in a rotatable way.

10. The device according to claim 8 , in which said inhibition means, when not actuated by the user, prevent rotation and/or translation of said slider.

11. The device according to claim 7 , in which there are present two engagement/release mechanisms set in positions corresponding to the opposite sides of the cap and which is characterized in that said control element is single and is set on the chin guard in a central position and/or outside the latter.

12. The device according to claim 7 , in which said slider is mounted on said chin guard and is rotatable between a position projecting outside said chin guard and a position flush therewith.

13. The device according to claim 12 , in which said slider is withheld elastically in said position flush with the chin guard.

14. The device according to claim 12 , in which said inhibition means, when not actuated by the user, prevent translation and/or rotation of said slider.

15. The device according to claim 1 , characterized in that said first actuation means comprise at least one tie rod for connection between a mobile control element and said at least one engagement/release mechanism.

16. The device according to claim 1 , characterized in that said first means for actuation of said engagement/release mechanism can be actuated by the user according to a direction (B), which is incident with respect to the direction of actuation (A) of said second inhibition means.

17. The device according to claim 1 , characterized in that said first actuation means can be actuated by the user in a sense opposite, at least with respect to one direction, to the sense of actuation of said second inhibition means.

18. A crash helmet for motor-cyclists of the type which comprises a rotatable chin guard hinged to the sides of the cap of the helmet, characterized in that it comprises a releasing device for enabling rotation of said chin guard according to claim 1 .

19. A method for releasing and enabling rotation of a chin guard hinged to the sides of the cap of a crash helmet, in particular a helmet for motor-cyclists, and constrained thereto by means of at least one mechanism for engagement/release for disabling/enabling rotation of the chin guard with respect to the cap, said helmet comprising first means for actuation of said engagement/release mechanism and second means for inhibition of release, said first and second means being actuatable by a user and said second means preventing, when not actuated by the user, operation of said first actuation means and/or of said at least one engagement/release mechanism, said method being characterized by the steps of:

actuating first said second inhibition means for enabling the operation of said first actuation means and/or of said at least one engagement/release mechanism; and

then actuating said first means for actuation of the engagement/release mechanism.

20. The method according to claim 19 , characterized in that said step of actuating said first means for actuation of the engagement/release mechanism takes place whilst said second inhibition means continue to be actuated.