Backrest angle adjustment mechanism and infant carrier thereof

1. A backrest angle adjusting mechanism for being assembled with a seat body and a backrest of an infant carrier, the seat body being installed on a frame of the infant carrier, the backrest being rotatably connected to the seat body, wherein the backrest angle adjusting mechanism comprises:

at least one fixing member; and

at least one adjusting member;

wherein the at least one fixing member is fixed on the backrest, one end of the at least one adjusting member is connected to the seat body or the frame to form a connecting part, and the other end of the at least one adjusting member is bypassed around the at least one fixing member to form an operating part, operating of the operating part causes the at least one adjusting member to slide on the at least one fixing member, and sliding of the at least one adjusting member brings the backrest to rotate in respect to the seat body, so as to adjust an inclination angle of the backrest, and

wherein the at least one fixing member includes

a convex portion protruding from the backrest in a direction crossing the backrest, and

a guide groove on an outer surface of the convex portion for guiding the at least one adjusting member to slide therein.

2. The backrest angle adjusting mechanism according to claim 1 , wherein

the at least one adjusting member includes

a first adjusting section connected to the connecting part and the at least one fixing member and

a second adjusting section connected to the at least one fixing member and the operating part, and

in response to the at least one adjusting member slides sliding on the at least one fixing member, a length of the first adjusting section increases while a length of the second adjusting section decreases, or vice versa. changes in inverse proportion.

3. The backrest angle adjusting mechanism according to claim 2 , wherein

the backrest has a lying state relatively flush with the seat body and an upright state relatively perpendicular to the seat body,

the length of the first adjusting section increases to adjust the backrest from the upright state to the lying state, and

the length of the first adjusting section decreases to adjust the backrest from the lying state to the upright state.

4. The backrest angle adjusting mechanism according to claim 1 , wherein

the at least one fixing member is fixed on a middle and upper portion of the backrest, and

the at least one adjusting member includes two adjusting members that are symmetrically wound on the at least one fixing member.

5. The backrest angle adjusting mechanism according to claim 1 , wherein

the at least one fixing member corresponds to the at least one adjusting member.

6. The backrest angle adjusting mechanism according to claim 5 , wherein the at least one fixing member is fixed on a middle and upper portion of the backrest, a head end and a tail end of the at least one adjusting member are connected to two sides of the seat body or the frame, respectively, so as to form two connection parts, a center of the at least one adjusting member bypasses around the at least one fixing member so as to form the operating part.

7. The backrest angle adjusting mechanism according to claim 5 , wherein

the at least one fixing member includes two fixing members symmetrically fixed on the backrest,

the at least one adjusting member includes two adjusting members, and

each of the two fixing members is wound with a corresponding adjusting member of the two adjusting members.

8. The backrest angle adjusting mechanism according to claim 5 , wherein

the at least one fixing member includes a plurality of fixing members arranged on the backrest in parallel and spaced with each other, and

the at least one adjusting member includes a plurality of adjusting members wound on the plurality of fixing members, respectively.

9. The backrest angle adjusting mechanism according to claim 5 , wherein the at least one adjusting member penetrates into the guide groove.

10. The backrest angle adjusting mechanism according to claim 9 , wherein the guide groove is arranged in a direction parallel to or perpendicular to a longitudinal direction of the backrest.

11. The backrest angle adjusting mechanism according to claim 9 , wherein the guide groove is an arc groove.

12. The backrest angle adjusting mechanism according to claim 9 , further comprising at least one anti-dropping member, which is arranged in the guide groove to prevent the at least one adjusting member from separating from the guide groove.

13. The backrest angle adjusting mechanism according to claim 12 , wherein

the anti-dropping member is located at a relative center of the guide groove and protrudes from a notch of the guide groove, and

the anti-dropping member is provided with a through hole communicated with the guide groove.

14. The backrest angle adjusting mechanism according to claim 9 , further comprising at least one limiting member, which is arranged in the guide groove to limit a sliding direction of the at least one adjusting member.

15. The backrest angle adjusting mechanism according to claim 14 , wherein the operating part is operated so that the at least one limiting element is relatively flush with the connecting part, the backrest is adjusted to a more upright position relative to the seat body.

16. The backrest angle adjusting mechanism according to claim 9 , wherein

the at least one fixing member comprises a positioning part and a guiding part connected with each other, the guiding part being defined by the convex portion,

the positioning part is fixedly connected to the backrest,

the guiding part and the positioning part are arranged parallel to or perpendicular to each other, and

the guide groove is arranged on the guiding part.

17. The backrest angle adjusting mechanism according to claim 16 , wherein the positioning part and the guiding part are an integrated structure.

18. The backrest angle adjusting mechanism according to claim 2 , further comprising at least one locking member, wherein

the other end of the at least one adjusting member passes through the at least one locking member after bypassing around the at least one fixing member, and

the at least one locking member is configured to lock the first adjusting section and the second adjusting section at a position after a length adjustment.

19. The backrest angle adjusting mechanism according to claim 18 , wherein the at least one adjusting member includes two adjusting members inserted and connected to the at least one locking member.

20. The backrest angle adjusting mechanism according to claim 1 , wherein the at least one adjusting member is a rope.