Helmet attachment mechanism for visor

1. An assembly for mounting a visor on a helmet comprising:

a visor assembly having a lens and a fastening element with at least one latching prong with a resiliently displaceable prong end;

a casing attached to the helmet and having at least one channel for receiving the at least one latching prong and at least one fixture, each fixture for engaging a respective prong end when displaced outwardly;

a lock having at least one locking prong that is insertable into the channel from an opposite end as the at least one latching prong and which has a locking prong end that is positionable under a respective latching prong to prevent displacement of the prong end inwardly to disengage from the respective fixture.

2. The assembly according to claim 1 , wherein the casing is pivotally and slidably attached to the helmet.

3. The assembly according to claim 1 , wherein the lock is spring biased in the casing to the locked position.

4. The assembly according to claim 1 , wherein the lock includes a locking detent that is releasably engaged to the casing to hold the lock in the locked position.

5. The assembly according to claim 1 , wherein the casing is mounted on a mounting assembly having an arcuate guide slot, the casing having a lug that rides in the guide slot as the visor is pivoted from a deployed position to a tilted up position.

6. The assembly according to claim 5 , wherein the casing is pivotally fastened to a lever that is pivotally fastened to the mounting assembly.

7. The assembly according to claim 6 , wherein the mounting assembly comprises a bracket having hooks that engage a brim of the helmet, a strap that attaches to the bracket, and a guide plate fastened to the bracket, the guide plate providing the arcuate guide slot; and an elastic cord fixed to the guide plate at one end and to the casing at an opposite end, the elastic cord channeled along a top of the guide plate.

8. The assembly according to claim 7 , further comprising a pivotal fastening between the helmet and the bracket.

9. The assembly according to claim 1 , wherein the at least one latching prong comprises a pair of latching prongs and the at least one fixture in the casing comprises edge portions of the casing that define opposite side windows, and wherein the latching prongs are deflected inwardly to enter the at least one channel and when fully inserted spring outwardly such that the latching prong ends enter the windows with the edges preventing separation of the fastening element from the casing, and wherein the locking prongs are inserted into the locked position underlying the respective latching prongs in the parallel channels, preventing inward movement of the latching prongs.

10. An assembly for mounting a visor on a helmet comprising:

a visor assembly having a lens and a fastening element in part supporting the lens and having a latching element;

a receiving element attached to the helmet and having a structure for receiving the latching element and an engagement element for engaging the latching element,

at least one of the latching element and the engagement element being resiliently displaceable to disengage the latching element from the engagement element;

a lock having a locking element that is engageable with one of the fastening element or the receiving element and which has a locking portion that is positionable adjacent to the at least one of the latching element and the engagement element to prevent disengagement of the latching element from the engagement element.

11. The assembly according to claim 10 , wherein the structure is pivotally and slidably attached to the helmet.

12. The assembly according to claim 10 , wherein the lock is spring biased to the structure to the locked position.

13. The assembly according to claim 10 , wherein the lock includes a locking detent that is releasably engaged to the structure to hold the lock in the locked position.

14. The assembly according to claim 10 , wherein the structure is mounted on a mounting assembly having an arcuate guide slot, the structure having a lug that rides in the guide slot as the visor is pivoted from a deployed position to a tilted up position.

15. The assembly according to claim 14 , wherein the structure is pivotally fastened to a lever that is pivotally fastened to the mounting assembly.

16. The assembly according to claim 15 , wherein the mounting assembly comprises a bracket having hooks that engage a brim of the helmet, a strap that attaches to the bracket, and a guide plate fastened to the bracket, the guide plate providing the arcuate guide slot; and an elastic cord fixed to the guide plate at one end and to the structure at an opposite end, the elastic cord channeled along a top of the guide plate.

17. The assembly according to claim 16 , further comprising a pivotal fastening between the helmet and the bracket.

18. The assembly according to claim 10 , wherein the latching element comprises a pair of latching prongs and the engagement element of the structure comprises edge portions of the structure that define opposite side windows, and wherein the latching prongs are deflected inwardly to enter the structure and when fully inserted spring outwardly such that the latching prong ends enter the windows with the edges preventing separation of the fastening element from the structure, and wherein the locking portion comprises a pair of locking prongs that are positioned underlying the respective latching prongs in the parallel channels when in the locked position, preventing inward movement of the latching prongs.