Energy-dissipation system

1. A child-restraint system comprising

a juvenile seat including a seat bottom and a seat back extending upwardly from the seat bottom and terminating at a top edge located in spaced-apart relation to the seat bottom and

an energy-dissipation system coupled to the seat back, wherein the energy-dissipation system includes a first multi-pad unit coupled to the seat back, the first multi-pad unit includes a first ride-down pad located near the top edge of the seat back to provide means for communicating with a head of a child seated in the juvenile seat at least when the juvenile seat is exposed to an external impact force and a second ride-down pad located between the first ride-down pad and the seat bottom to provide means for communicating with a shoulder of a child seated in the juvenile seat at least when the juvenile seat is exposed to the external impact force, the first ride-down pad includes a first force dissipater coupled to the seat back and a second force dissipater coupled to the first force dissipater to locate the first force dissipater between the second force dissipater and the seat back, and the second ride-down pad includes a third force dissipater coupled to the seat back.

2. The child-restraint system of claim 1 , wherein the seat back includes forwardly extending first and second side-wing panels and a backrest lying between the first and second side-wing panels and the first and third force dissipaters mate with the first side-wing panel to locate the first multi-pad unit in a space provided between the first and second side-wing panels.

3. The child-restraint system of claim 2 , wherein each of the first, second, and third force dissipaters include an air bag formed to include an air chamber and an air-discharge port opening into the air chamber and providing means for discharging air from the air chamber to the surroundings at a metered rate when the air bag is exposed to the external impact force so that the air bag absorbs external energy associated with the external impact force to minimize g-loads experienced by a child seated on the juvenile seat and a deformable support frame located in the air chamber and configured to maintain at least a predetermined volume of air in the air chamber until the air bag is deformed when exposed to the external impact force.

4. The child-restraint system of claim 3 , wherein the air bag in each of the first, second, and third force dissipaters includes a side wall arranged to face away from the backrest and formed to include the air-discharge port associated with said air bag to cause any air discharged from the air chambers in the first multi-pad unit to flow outwardly in a direction away from the backrest.

5. The child-restraint system of claim 4 , wherein the deformable support frame in the first force dissipater is located in the frame-receiving cavity of the first inner shell and the deformable support frame in the second force dissipater is located in the frame-receiving cavity of the second inner shell.

6. The child-restraint system of claim 3 , wherein the first multi-pad unit includes an inner tray mating with the first side-wing panel and including a first inner shell formed to include a frame-receiving cavity opening away from the first side-wing panel and formed to include the air-discharge port of the first force dissipater and a second inner shell formed to include a frame-receiving cavity opening away from the first side-wing panel and formed to include the air-discharge port of the third force dissipater and the first multi-pad unit further includes a sheet including a partition coupled to the first inner shell to form the air chamber of the first force dissipater therebetween and a first outer shell coupled to the second inner shell to form the air chamber of the third force dissipater therebetween.

7. The child-restraint system of claim 6 , wherein the sheet included in the first multi-pad unit is monolithic and is formed to include a web interconnecting the first and second inner shells.

8. The child-restraint system of claim 6 , wherein the pad-retainer tether is coupled to at least one of the sheet and the tray.

9. The child-restraint system of claim 6 , wherein the pad-retainer tether includes a first anchor strip coupled to the sheet, a second anchor strip coupled to the tray and arranged to mate with and extend along the first anchor strip to form a bendable board extending away from the sheet and the tray, and a fastener coupled to at least one of the first and second anchor strips and to the backrest to anchor the first multi-pad unit to the seat back.

10. The child-restraint system of claim 6 , wherein the first multi-pad unit further includes a second outer shell formed to include a frame-receiving cavity opening toward the first side-wing panel and formed to include the air-discharge port of the second force dissipater and the second outer shell is coupled to the partition included in the sheet to form the air chamber of the second force dissipater therebetween.

11. The child-restraint system of claim 10 , wherein the deformable support frame in the first force dissipater is located in the frame-receiving cavity of the first inner shell, the deformable support frame in the second force dissipater is located in the frame-receiving cavity of the second outer shell, and the deformable support frame in the third force dissipater is located in the frame-receiving cavity of the second inner shell.

12. The child-restraint system of claim 2 , wherein the energy-dissipation system further includes a second multi-pad unit coupled to the seat back, the second multi-pad unit includes a first ride-down pad located near the top edge of the seat back to provide means for communicating with a head of a child seated in the juvenile seat at least when the juvenile seat is exposed to an external impact force and a second ride-down pad located between the first ride-down pad of the second multi-pad unit and the seat bottom to provide means for communicating with a shoulder of a child seated in the juvenile seat at least when the juvenile seat is exposed to the external impact force, the first ride-down pad of the second multi-pad unit includes a first force dissipater coupled to the seat back and a second force dissipater coupled to the first force dissipater to locate the first force dissipater between the second force dissipater, and the second ride-down pad of the second multi-pad unit includes a third force dissipater coupled to the seat back, and wherein the first and third force dissipaters of the second multi-pad unit mate with the second side-wing panel to locate the second multi-pad unit in a space provided between the second side-wing panel and the first multi-pad unit and in spaced-apart relation to the first multi-pad unit to define therebetween means for receiving a head and a shoulder of a child seated in the juvenile seat.

13. The child-restraint of claim 12 , wherein the air bag in each of the first, second, and third force dissipaters in each of the first and second multi-pad units includes a side wall arranged to face away from the backrest and formed to include the air-discharge port associated with said air bag to cause any air discharged from the air chambers in the first and second multi-pad units during exposure of the air bags to the external impact force to flow outwardly in a direction away from the backrest.

14. The child-restraint system of claim 2 , wherein the first side-wing panel includes an exterior sheet made of a plastics material and an interior shock-absorber bed made of a relatively soft deformable material and located between the exterior sheet and the second side-wing panel and the first and third force dissipaters are arranged to mate with the interior shock-absorber bed of the first side-wing panel.

15. The child-restraint system of claim 14 , wherein the first and third force dissipaters are coupled to one another to interconnect the first and second ride-down pads.

16. The child-restraint system of claim 14 , wherein the backrest includes an exterior sheet made of a plastics material and an interior shock-absorber bed made of a relatively soft deformable material and the first multi-pad unit further includes a pad-retainer tether coupled to the interior shock-absorber bed of the backrest to retain the first and third force dissipaters in mating engagement with the interior shock-absorber bed of the first side-wing panel.

17. The child-restraint system of claim 14 , wherein the juvenile seat further includes a seat cover made of a fabric material and coupled to the seat back and seat bottom and the first, second, and third force dissipaters are arranged to lie in a space provided between the seat pad and the interior shock-absorber bed of the first side-wing panel.

18. A child-restraint system comprising

a juvenile seat including a seat bottom and a seat back extending upwardly from the seat bottom and terminating at a top edge located in spaced-apart relation to the seat bottom and

an energy-dissipation system coupled to the seat back, wherein the energy-dissipation system includes a first multi-pad unit coupled to the seat back, the first multi-pad unit includes a series of four ride-down pads, wherein a highest ride-down pad is located near the top edge of the seat back, a high ride-down pad is located between the highest ride-down pad and the seat bottom, the highest and high ride-down pads cooperate to provide means for communicating with a head of a child seated in the juvenile seat at least when the juvenile seat is exposed to an external impact force, a low ride-down pad is located between the high ride-down pad and the seat bottom, a lowest ride-down pad is located between the low ride-down pad and the seat bottom, the low and lowest ride-down pads cooperate to provide means for communicating with a shoulder of a child seated in the juvenile seat at least when the juvenile seat is exposed to the external impact force, each of the highest and high ride-down pads includes a first head force dissipater coupled to the seat back and a second head force dissipater coupled to the first force dissipater to locate the first force dissipater between the second force dissipater, and each of the low and lowest ride-down pads includes a shoulder force dissipater coupled to the seat back.

19. The child-restraint system of claim 18 , wherein the seat back includes forwardly extending first and second side-wing panels and a backrest lying between the first and second side-wing panels and each of the first head force dissipaters of the highest and high ride-down pads and the shoulder force dissipaters of the low and lowest ride-down pads are coupled to the first side-wing panel to locate the first multi-pad unit in a space provided between the first and second side-wing panels.

20. The child-restraint system of claim 19 , wherein the first side-wing panel includes an exterior sheet made of a plastics material and an interior shock-absorber bed made of a relatively soft deformable material and located between the exterior sheet and the second side-wing panel and each of the first head force dissipaters of the highest and high ride-down pads and the shoulder force dissipaters of the low and lowest ride-down pads are arranged to mate with the interior shock-absorber bed of the first side-wing panel.

21. The child-restraint system of claim 19 , wherein each of the first and second head force dissipaters and the shoulder force dissipaters include an air bag formed to include an air chamber and an air-discharge port opening into the air chamber and providing means for discharging air from the air chamber to the surroundings at a metered rate when the air bag is exposed to the external impact force so that the air bag absorbs external energy associated with the external impact force to minimize g-loads experienced by a child seated on the juvenile seat.

22. The child-restraint of claim 21 , wherein the air bag in each of the first and second head force dissipaters includes a side wall arranged to face away from the backrest and formed to include the air-discharge port associated with said air bag to cause any air discharged from the air chambers in the first multi-pad unit to flow outwardly in a direction away from the backrest.

23. The child-restraint of claim 18 , wherein the energy-dissipation system further includes a second multi-pad unit, the second multi-pad unit coupled to the seat back, the second multi-pad unit includes a series of four ride-down pads, wherein a highest ride-down pad is located near the top edge of the seat back, a high ride-down pad is located between the highest ride-down pad and the seat bottom, the highest and high ride-down pads cooperate to provide means for communicating with a head of a child seated in the juvenile seat at least when the juvenile seat is exposed to an external impact force, a low ride-down pad is located between the high ride-down pad and the seat bottom, a lowest ride-down pad is located between the low ride-down pad and the seat bottom, the low and lowest ride-down pads cooperate to provide means for communicating with a shoulder of a child seated in the juvenile seat at least when the juvenile seat is exposed to the external impact force, each of the highest and high ride-down pads includes a first head force dissipater coupled to the seat back and a second head force dissipater coupled to the first force dissipater to locate the first force dissipater between the second force dissipater and the seat back, and each of the low and lowest ride-down pads includes a shoulder force dissipater coupled to the seat back, and wherein the first head force dissipaters of the second multi-pad unit mate with the second side-wing panel to locate the second multi-pad unit in a space provided between the second side-wing panel and the first multi-pad unit and in spaced-apart relation to the first multi-pad unit to define therebetween means for receiving a head and a shoulder of a child seated in the juvenile seat.

24. The child restraint of claim 23 , wherein the air bag in each of the first and second head force dissipaters includes a side wall arranged to face away from the backrest and formed to include the air-discharge port associated with said air bag to cause any air discharged from the air chambers in the first multi-pad unit to flow outwardly in a direction away from the backrest.