Collapsible high chair

1. A collapsible high chair, comprising:

a front frame including a pair of middle front tubes and a substantially U-shaped lower front tube, the pair of middle front tubes and the lower front tube being detachably connected to each other by fastening devices;

a rear frame including a substantially U-shaped upper rear tube and a substantially U-shaped lower rear tube, the upper rear tube and the lower rear tube being detachably connected to each other by fastening devices; and

a seat, the seat being pivotally connected to the rear frame and sliding pivotally on the front frame,

wherein the front frame and the rear frame are pivotally connected to each other so that the front frame and the rear frame pivot and approach with respect to each other, thereby allowing the high chair to be in a collapsed state.

2. A collapsible high chair according to claim 1 , wherein the front frame further comprises a substantially U-shaped upper front tube, the upper front tube and the pair of middle front tubes are detachably connected to each other by fastening devices.

3. A collapsible high chair according to claim 1 , wherein front portions of both sides of the seat are pivotally connected to middle portions of both sides of the upper rear tube of the rear frame.

4. A collapsible high chair according to claim 1 , wherein each of rear portions of both sides of the seat are pivotally connected to a slide member provided on an upper portion of each of the pair of middle front tubes of the front frame, so that the seat slides pivotally on the upper portions of the pair of middle front tubes of the front frame.

5. A collapsible high chair according to claim 1 , wherein both ends of the upper rear tube are detachably engaged with both ends of the lower rear tube by the fastening devices respectively, and middle portions of both sides of the upper rear tube of the rear frame are pivotally connected to middle portions of the pair of middle front tubes of the front frame respectively.

6. A collapsible high chair according to claim 5 , wherein each of the fastening devices has a projection for penetrating and engaging a hole provided on the tubes.

7. A collapsible high chair according to claim 6 , wherein each of the fastening devices is substantially a V-shaped spring fastener having two elastic arms, and the projection is located in one of the elastic arms.

8. A collapsible high chair according to claim 7 , wherein the spring fastener is formed of metal, plastic or elastic material.

9. A collapsible high chair according to claim 1 , further comprising a substantially U-shaped arm member, the arm member being pivotally connected to the front frame and detachably fixed to the rear frame.

10. A collapsible high chair according to claim 9 , wherein both ends of the arm member are pivotally connected to upper portions of the pair of middle front tubes of the front frame respectively.

11. A collapsible high chair according to claim 9 , wherein a front portion of the arm member is detachably fixed to the upper rear tube of the rear frame.

12. A collapsible high chair according to claim 9 , further comprising a tray, the tray being detachably provided on the arm member.

13. A collapsible high chair comprising:

a front frame including a first front portion and a second front portion detachably connected to the first front portion;

a rear frame including a first rear portion and a second rear portion detachably connected to the first rear portion, the first rear portion of the rear frame is pivotally connected to the first front portion of the front frame; and

a seat, the seat being pivotally connected to the rear frame and sliding pivotally on the front frame;

wherein the high chair is movable between an expanded state where the front frame and the rear frame are spaced from each other, and a collapsed state where the front frame and the rear frame are close to each other.

14. A collapsible high chair comprising:

a front frame including a first front portion and a second front portion detachably connected to the first front portion by a first fastening device;

a rear frame including a first rear portion and a second rear portion detachably connected to the first rear portion by a second fastening device, the first rear portion of the rear frame is pivotally connected to the first front portion of the front frame for moving away from or toward the first front portion of the front frame so that the high chair can be moved between an expanded state and a collapsed state; and

a seat, the seat being pivotally connected to the rear frame and sliding pivotally on the front frame,

wherein the second front portion and the second rear portion are detached from the first front portion and the first rear portion respectively to make the high chair in a compact volume while the high chair is in the collapsed state.

15. A collapsible high chair according to claim 14 , wherein the first fastening device includes a first V-shaped spring fastener on one of the first and second front portions and a first hole on the other of the first and second front portions, the first spring fastener includes a projection for passing through the first hole to couple the first and second front portions together, and the second fastening device includes a second V-shaped spring fastener on one of the first and second rear portions and a second hole on the other of the first and second rear portions, the second spring fastener includes a projection for passing through the second hole to couple the first and second rear portions together.