Retention system for safety helmet

1. A safety helmet comprising:

a. a body configured to receive a wearer's bead;

b. a chinstrap;

c. a stabilizer strap;

d. a rear head-retention element responsive to the chinstrap and the stabilizer strap such that (i) tightening of the chinstrap draws the head-retention element in both forward and upward directions and (ii) adjustment of the stabilizer strap changes a tension on the head-retention element; and

e. an adjustment mechanism, at an end of the stabilizer strap, for changing the tension on the head-retention element without affecting the chinstrap.

2. The safety helmet of claim 1 wherein the body comprises a crown portion, a forward portion, a rear portion, and a cavity for receiving the wearer's head, the head-retention element being located within the cavity at the rear portion of the helmet, tightening of the chinstrap drawing the head-retention element toward both the crown portion and the forward portion.

3. The safety helmet of claim 1 wherein the head-retention element comprises a stabilizer configured to engage the rear of the wearer's head.

4. The safety helmet of claim 3 wherein the stabilizer is engaged by the stabilizer strap.

5. The safety helmet of claim 3 wherein the stabilizer strap frictionally engages the chinstrap.

6. The safety helmet of claim 1 wherein the chinstrap comprises multiple straps in a Y configuration.

7. The safety helmet of claim 1 wherein the head-retention element is engaged by the stabilizer strap, tightening of the chinstrap placing tension on the stabilizer strap.

8. The safety helmet of claim 1 wherein the adjustment mechanism comprises a latch.

9. The safety helmet of claim 8 wherein the latch comprises a parallel strap frictionally engaging the stabilizer strap.

10. The safety helmet of claim 8 wherein the latch comprises angular elements that engage the stabilizer strap.

11. The safety helmet of claim 8 wherein the latch comprises a locking element that secures the stabilizer strap.

12. A method of securing a safety helmet, the method comprising the steps of:

a. providing a safety helmet comprising a body configured to receive a wearer's head, a chinstrap, a stabilizer swap, an adjustment mechanism at an end of the stabilizer strap, and a rear head-retention element; and

b. with the wearer's head within the body, tightening the chinstrap so as to secure the safety helmet to the wearer's head, and using the adjustment mechanism, adjusting a tension on the head-retention element to draw the head-retention element in both forward and upward directions without affecting the chinstrap.

13. The method of claim 12 , wherein tightening of the chinstrap places tension on the stabilizer strap.

14. The method of claim 12 , wherein the adjustment mechanism is slidably engaged with the chinstrap.

15. The method of claim 12 , wherein the tension on the stabilizer strap is adjusted by sliding the adjustment mechanism along the chinstrap.

16. A safety helmet comprising:

a. a body configured to receive a wearer's head;

b. a chinstrap; and

c. a rear head-retention element responsive to the chinstrap such that tightening of the chinstrap draws the head-retention element in both forward and upward directions;

wherein the chinstrap comprises a plurality of strap legs in at least two Y configurations, ends of two legs of each Y configuration being attached to the body of the safety helmet.

17. The safety helmet of claim 16 wherein the chinstrap is adjustable with respect to one of the attached legs.

18. The safety helmet of claim 16 further comprising an adjustment mechanism.

19. The safety helmet of claim 18 wherein the adjustment mechanism facilitates adjusting a tension on the head-retention element without affecting the chinstrap.

20. The safety helmet of claim 16 wherein the strap legs form two Y configurations.