Child stroller frame

1. A child stroller frame comprising:

a first frame portion including a handle frame segment and a front leg segment pivotally connected with each other;

a second frame portion pivotally connected with the front leg segment;

a pivoting part having one end fixedly connected with a wheel support member and another end pivotally connected with the second frame portion; and

a linkage movably coupling the first frame portion to the pivoting part, the linkage having a first end pivotally connected with the front leg segment, a second end pivotally connected with the pivoting part, and an intermediate portion between the first end and the second end that is pivotally connected with the second frame portion, whereby the first frame portion and the wheel support member are movably linked for folding in a concurrent manner toward the second frame portion;

wherein the second frame portion has two opposite ends, and the intermediate portion of the linkage is pivotally connected with the second frame portion at a fixed position relative to the two opposite ends of the second frame portion.

2. The child stroller frame according to claim 1 , wherein the front leg segment is pivotally connected with the second frame portion at one of the two opposite ends thereof, and the pivoting part is pivotally connected with the second frame portion at the other one of the two opposite ends thereof.

3. The child stroller frame according to claim 1 , wherein the wheel support member is a rear wheel support member.

4. The child stroller frame according to claim 1 , wherein the wheel support member includes a transversal axle or a wheel mount.

5. The child stroller frame according to claim 1 , wherein the linkage includes a first bar, a second bar and a third bar, the first bar being pivotally connected with the second frame portion and having two opposite ends respectively connected pivotally with the second bar and the third bar, the second bar being pivotally connected with the pivoting part, and the third bar being pivotally connected with the front leg segment.

6. The child stroller frame according to claim 5 , wherein the second bar includes a curved profile with a concavity facing downward.

7. The child stroller frame according to claim 5 , wherein the first bar has a L-shape.

8. The child stroller frame according to claim 5 , wherein the first bar has a first and a second bar portion that intersect each other at an angle, and the second frame portion is pivotally connected with the first bar in a region thereof where the first bar portion joins with the second bar portion.

9. The child stroller frame according to claim 8 , wherein the first bar including the first and second bar portions is formed integrally as a single body.

10. The child stroller frame according to claim 8 , wherein the first and second bar portions are extendible to two opposite sides of the second frame portion.

11. A child stroller frame comprising:

a first and a second frame portion, the second frame portion having a front end and a rear end, the front end of the second frame portion being pivotally connected with the first frame portion;

a pivoting part having one end fixedly connected with a rear wheel support member and another end pivotally connected with the rear end of the second frame portion; and

a linkage movably coupling the first frame portion to the pivoting part, wherein the linkage includes a plurality of bars, a first one of the bars being formed integrally as a single body having has a first and a second bar portion that intersect each other at an angle, an intermediate portion of the second frame portion between the front end and the rear end thereof being pivotally connected with the first bar in a region thereof where the first bar portion of the first bar joins with the second bar portion of the first bar, whereby the first frame portion and the rear wheel support member are movably linked for folding in a concurrent manner toward the second frame portion.

12. The child stroller frame according to claim 11 , wherein the first frame portion includes a handle frame segment and a front leg segment pivotally connected with each other.

13. The child stroller frame according to claim 12 , wherein the child stroller frame is folded either with the handle frame segment and the front leg segment lying at one same side of the second frame portion, or with the handle frame segment and the front leg segment respectively lying at two opposite sides of the second frame portion.

14. The child stroller frame according to claim 12 , wherein the linkage has a first end pivotally connected with the front leg segment and a second end pivotally connected with the pivoting part.

15. The child stroller frame according to claim 11 , wherein the second frame portion includes a tube segment having two opposite sides extending between the front end and the rear end of the second frame portion, and the first bar portion and the second bar portion are respectively extendible at the two opposite sides of the tube segment of the second frame portion.

16. The child stroller frame according to claim 11 , wherein the bars of the linkage include a second bar and a third bar, the second bar being respectively connected pivotally with the first bar and the pivoting part, and the third bar being respectively connected pivotally with the first bar and the first frame portion.

17. The child stroller frame according to claim 16 , wherein the second bar includes a curved profile with a concavity facing downward.

18. The child stroller frame according to claim 11 , wherein the rear wheel support member includes a transversal axle or a wheel mount.

19. The child stroller frame according to claim 11 , wherein the first bar is pivotally connected with the second frame portion at a fixed position relative to the front end and the rear end of the second frame portion.