Background of the Invention In a conventional umbrella-handle perambulator, two push-rods are articulated respectively with the corresponding two front legs and there are no transverse rods connected directly between the push-rods and the front legs. When a baby is sitting on a baby cushion connected to the two push-rods, the weight of the baby will drag the cushion which in turn will pull the two push-rods to curve inwards.

Since the joint portions between the push-rods and the front legs are relatively weak, and then the curving in this portion is most serious, the plastic joint members between the push-rods and the front legs will be damaged, or the wheel axle of the front legs will not be parallel any more with the ground surface and therefore the front wheels on the lower end portion of the front legs can not rotate smoothly.

S lLmsn of the Invention Therefore, an object of the present invention is to provide coupling means between the front legs and push-rods of an umbrella-handle perambulator, which improves the stiffness of the coupling portion of the front legs and the push-rods and results in a less curving of the legs and the rods.

According to the invention, coupling means are provided between front legs and push-rods of an umbrella-handle perambulator, in which an upper end portion of a front leg and a lower end portion of a push-rod and articulated to each other by means of a rotation shaft. An end of a retaining tooth is fixed in one of the upper end portion of the front leg and the lower end portion of the push-rod. The other

end of the retaining tooth is inserted into a receiving hole formed in the other one of the upper end portion of the front leg and the lower end portion of the push- rod.

The present invention has the following advantages as compare with the prior art: 1. In addition to the articulation points between the front legs and the push-rods, at least an additional coupling point is provided by the retaining tooth so that the connection stiffness is improved between a front leg and a push-rod.

2. Since the central axis of the retaining tooth is on the rotation plane defined by the rotation of the push-rod around the rotation shaft, the retaining tooth will not interfere with the rotation of the push-rods when the perambulator is folded up or unfolded, and no additional operation is needed.

Brief Description of the Attache Drawings More detailed description of the embodiments according to the invention will be made hereafter with reference to the accompanying drawings, in which: Fig. 1 is a perspective view showing the structure of an embodiment of the present invention (with the cushion removed); Fig. 2 is an enlarged view showing a coupling portion between a front leg and a push-rod of the embodiment in Fig. 1; and Fig. 3 is a perspective view showing the structure of another embodiment of the present invention.

In the drawings, the reference numeral 1 indicates a retaining tooth; numeral 2 indicates push-rods; numeral 3 indicates a rotation shaft; numeral 4 indicates a coupling block; and numeral 5 indicates front legs.

Detailed Explanation of the Embodiments As shown in the drawings, an upper end portion of a front leg 5 and a lower end portion of a push-rod 2 are overlapped with each other. In a different umbrella-handle perambulator, an upper end portion of a front leg may overlie on a lower end portion of a push-rod; or vise versa, the lower end portion of the push-rod may overlie on the upper portion of the front leg, just like as shown in Fig. 1. The upper end portion of the front leg 5 is articulated with the lower end portion of the push-rod 2 by means of a rotation shaft 3. An end of a retaining tooth 1 is fixed in one of the overlapping upper end portion of front leg 5 and lower end portion of the push-rod 2. The other end of the retaining tooth extends towards a receiving hole formed in the other one of the overlapping upper end portion of the front leg 5 and the lower end portion of the push-rod 2 and is inserted into the receiving hole. The other end of the retaining tooth 1 extends in a rotation plane formed by the rotation of the push-rod 2 around the rotation shaft 3. The number of the retaining tooth 1 may be two, as shown in Fig. 1 or only one as shown in Fig. 3, so as to provide at least one more coupling point in addition to the rotation shaft 3 between the front leg 5 and the push-rod 2. An end of the retaining tooth 1 is fixed in the upper end portion of the front leg 5 while the other end of the retaining tooth 1 is inserted into the receiving hole formed in the lower end portion of the push-rod 2. As an equivalent alternative, an end of the retaining tooth 1 is fixed in the lower end portion of the push-rod 2 while the other end of the retaining tooth 1 is inserted into the receiving hole formed in the upper end portion of the front leg 5. When the retaining tooth 1 is fixed to one of the front leg 5 and the push-rod 2, it always extends on the rotation plane of said one to which the retaining tooth is fixed towards the other one. When the umbrella-handle is unfolded, the retaining tooth 1 is inserted into the receiving hole formed in the other one. The retaining tooth 1 is deposed between the longitudinally overlapping upper end portion of the front leg 5 and the lower

end portion of the push-rod 2. The axis of the retaining tooth 1 is on the rotation plane formed by the rotation of the front leg 5 and the push-rod 2 relative to each other around the rotation shaft 2. The rotation plane is perpendicular to a horizontal plane so that the push-rod 2 can be unfolded in a vertical plane. The axis of the retaining tooth 1 is perpendicular to both an axis of the upper end portion of the front leg 5 and an axis of the lower end portion of the push-rod 2. A coupling block 4 is fixed to the front leg 5 at a position near to the upper end portion. The coupling block 4 extends upwards and has an upward opening. The lower end portion of the push-rod 2 is inserted into the opening of the coupling block 4. The coupling block 4 is articulated with the push-rod by means of the rotation shaft 3. The coupling block 4 allows the front leg 5 and the push-rod 2 to rotate relative to each other in the same plane when they are articulated together. The retaining tooth 1 is closely fitted in the receiving hole so as to provide a stiffer connection between the front leg 5 and the push-rod 2. Fig. 1 shows a preferred embodiment in which the lower end portion of the push-rod 2 overlies on the upper end portion of the front leg 5, and one end of the retaining tooth 1 is fixed in the front leg 5 while the other end extends upward and is inserted into the receiving hole formed in the overlying push-rod 2. As an equivalent alternative for the embodiment as shown in Fig. 1, the upper end portion of the front leg 5 overlies on the lower end portion of the push-rod 2, and one end of the retaining tooth 1 is fixed in the push-rod 2 while the other end extends downward and is inserted into the receiving hole formed in the underlying front leg 5.