Child safety seat having a headrest

1. A child safety seat comprising:

a seat portion; and

a backrest assembly configured to connect with the seat portion, the backrest assembly including a backrest portion and a headrest portion, the headrest portion including a headrest mounting part adapted to connect with the backrest portion so that the headrest portion is held with the backrest portion via the headrest mounting part, and a head support that is adapted to provide support for a child's head and is installable on and removable from the headrest mounting part;

wherein the headrest mounting part includes a central portion and two first sidewalls that are connected with the central portion and respectively protrude forward at a left and a right side of the central portion, and the head support has two second sidewalls respectively corresponding to the two first sidewalls, at least one of the two first sidewalls having a fastening part that is operable to engage with a corresponding one of the two second sidewalls for locking the head support to the headrest mounting part, the fastening part having an inward bend that projects toward a central region between the two first sidewalls and is engageable with an outer edge of the corresponding one of the two second sidewalls.

2. The child safety seat according to claim 1 , wherein the fastening part achieves a snap-fitting connection.

3. The child safety seat according to claim 1 , wherein, the fastening part is formed integrally with the at least one of the two first sidewalls.

4. The child safety seat according to claim 1 , wherein the fastening part is provided at an outer edge of the headrest mounting part, and is operable to engage and disengage the outer edge of the corresponding one of the two second sidewalls of the head support for locking and unlocking the head support with respect to the headrest mounting part.

5. The child safety seat according to claim 4 , wherein the at least one fastening part includes a resilient tab, and is operable to engage and disengage a sunken area on the outer edge of the corresponding one of the two second sidewalls of the head support for locking and unlocking the head support with respect to the headrest mounting part.

6. The child safety seat according to claim 5 , wherein the fastening part has a protruding rib that is adapted to be received at least partially in a slit provided inside the sunken area when the fastening part engages with the sunken area.

7. The child safety seat according to claim 1 , wherein the fastening part is a resilient tab formed to include the inward bend projecting toward the central region between the two first sidewalls.

8. The child safety seat according to claim 1 , wherein the fastening part is operable to engage with a receiving region provided on the outer edge of the corresponding one of the two second sidewalls.

9. The child safety seat according to claim 8 , wherein the receiving region includes a sunken area provided on the outer edge.

10. The child safety seat according to claim 9 , wherein the sunken area and the fastening part have matching shapes so that the fastening part fits into the sunken area for locking the head support to the headrest mounting part.

11. The child safety seat according to claim 1 , wherein the headrest portion further include a positioning structure including a protruding rib provided on one of the headrest mounting part and the head support, which is adapted to be received in a slit provided on the other one of the headrest mounting part and the head support.

12. The child safety seat according to claim 11 , wherein the rib is formed integrally with one of the two first sidewalls and disposed at an inner side thereof.

13. The child safety seat according to claim 1 , wherein one of the headrest mounting part and the head support is fixedly connected with two belt guides adapted to receive the passage of a vehicle safety belt.

14. The child safety seat according to claim 13 , wherein the two belt guides are fixedly connected with the headrest mounting part, and the head support has two concavities that are respectively positioned adjacent to the two belt guides when the head support is assembled with the headrest mounting part.

15. The child safety seat according to claim 1 , wherein the headrest mounting part includes two transversally spaced-apart bars adapted to be received in the backrest portion for slidably coupling the headrest portion to the backrest portion.

16. The child safety seat according to claim 1 , wherein the corresponding one of the two second sidewalls of the head support has an outer surface facing the headrest mounting part, and an inner surface opposite to the outer surface, the outer edge of the corresponding one of the two second sidewalls being connected with the outer surface and the inner surface.

17. The child safety seat according to claim 1 , wherein the outer edge of the corresponding one of the two second sidewalls faces forward.

18. The child safety seat according to claim 1 , wherein the fastening part is movable sideways away from and toward the central region between the two first sidewalls.