Collapsible Structure for a Stroller

Most strollers on the present market are collapsible. However, the collapsible structure for prior art strollers is too simple in construction and is liable to cause accidents. This is because the controlling lever of the prior art may be operated inadvertently thereby collapsing the stroller suddenly and causing hurt to the baby therein. In order to enable the Examiner to understand the collapsible structure and function of the prior art stroller, the structure and principle thereof are shown in FIGS. 7 and 8. The prior art stroller may be roughly divided into front leg A, rear leg B, back rest D, handle grip C, and seat support I and J. The handle grip C is pivotally connected with the back rest D on which there is an engaging hook 81 controlled by a lever 82. The engaging hook 81 is connected with a pin 83 in engaging state. When it is desired to collapse the stroller, simply press the lever 82 detaching the engaging hook 81 from the pin 83 and the stroller may be collapsed. However, since the lever 82 is disposed at an easily accessible position, the lever 82 is often inadvertently pressed thus collapsing the stroller suddenly and possibly injuring the baby therein. This is the most important problem that the manufacturers must overcome.

For the above reasons, the applicant designs a novel and improved collapsible structure for a stroller which may obviate and mitigate the above-mentioned drawback.

This invention relates to an improved collapsible structure for a stroller.

It is the primary object of the present invention to provide a collapsible structure for a stroller which is easy to operate.

It is another object of the present invention to provide a collapsible structure for a stroller which is safe in use.

It is still another object of the present invention to provide a collapsible structure for a stroller which is simple in construction.

It is still another object of the present invention to provide a collapsible structure for a stroller which is fit for mass production.

Other objects and merits and a fuller understanding of the present invention will be obtained by those having ordinary skill in the art when the following detailed description is read in conjunction with the accompanying drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 shows the structure of the present invention;

FIG. 3 is a sectional view showing the structure of the present invention;

FIG. 4 shows the principle of the present invention;

FIG. 5 shows the how the present invention works;

FIG. 6 shows the collapsed state of the present invention;

FIG. 7 shows a prior art stroller; and

FIG. 8 shows the principle of the prior art stroller.

With reference to FIGS. 1, 2 and 3, the present invention has the same framework as the prior art and is basically composed of two front legs A, two rear legs B, a push frame C, and a back rest D. The front leg A is connected with the rear leg B through a pivot member E on which there is an arm rest F pivotally connected with the back rest D. Further, the front leg A is pivotally connected with the back rest D via a linking rod G, while the rear leg B pivotally connected with the back rest D via a link H. By means of the above-mentioned pivotal connections, the stroller may be expanded or collapsed easily.

The rear leg B is provided with a seat member 1 which is riveted on the rear leg B at one end and has a raised flat surface 11 at the other. The lower edge of the raised flat surface 11 is formed with a recess 12. A leaf spring 2 is mounted on the rear leg B and disposed within the seat member 1. In case of external force, the leaf spring 2 pushes upward the seat member 1 at the end with the raised flat surface 11. The rear leg B is further provided with an engaging member 3 which has a flange 31 at the end against the raised flat surface 11 of the seat member 1 and a chamber at the other for receiving a spring 4. One end of the spring 4 bears against the inner end of the chamber while the other end of the spring 4 is stopped by a pin 5 so that the engaging member 3 may be moved along the rear leg B. The bottom of the back rest D is provided with a limit block 6 which has a lower actuating portion 61, a notch 62 and a stop edge 63.

As shown in FIGS. 1 and 3, the stroller according to the present invention is in an expanded state wherein the flange 31 of the engaging member 3 is received in the limit block 6 and applies a force against the upper flat surface of the engaging member 3. Meanwhile, the notch 62 of the limit block 6 just receives the flat surface 11 of the seat member 1. When desired to collapse the stroller, the user may step on the seat member 1 so as to press the leaf spring 2 thereby pushing the seat member 1 towards the rear leg B. As the seat member 1 goes towards the rear leg B, the inclined wall of the recess 12 of the seat member 1 will urge against the engaging member 3 which will then compress the spring 4 and move rearwards until the flat surface 11 of the seat member 1 is located below the flange 31 of the engaging member 3 and the spring 4 pushes the flange 31 of the engaging member 3 downwards to enclose the edge of the flat surface 11 of the seat member 1 (see FIG. 4). When the stop edge 63 of the limit block 6 is no longer confined by the seat member 1, the limit block 6 and the back rest D will be able to swing rearwards (see FIGS. 5 and 6) and finally, the lower actuating portion 61 of the limit block 6 together with the rear wheel 7 will be in contact with the ground (see FIG. 7) hence making it easier to be stowed.

Both sides of the stroller are symmetric in structure, i.e. the rear leg on both sides is provided with a seat member 1 and an engaging member 3. Of course, both sides of the back rest D has a limit block 6. As stated above, the seat members 1 on two sides are not linked together and so it is necessary to operate both seat members 1 in the same procedures thereby preverting the stroller from being collapsed inadvertently. As to the prior art stroller (see FIGS. 7 and 8), the engaging hooks on both sides are connected together and so when either the press rod or the link rod is pressed, both engaging hooks will detach from the left and right legs. Hence, in case of inadvertent impact or press by the naughty children, the stroller may be easily collapsed thus liably hurting the baby therein.

In conclusion, the seat member 1, the engaging member 3 and the limit block are new components as to the prior art.