Abstract:
This invention relates to a collapsible shopping cart and in particular to one comprising a basket having a base support which enables it to sustain heavy loads without deforming and wheel assemblies which is easy to fit on the bottom of the basket, whereby the cart can receive, store and transport heavy articles. Furthermore, the cart is provided with wheels which are easily assembled.

Description:
BACKGROUND OF THE INVENTION 
     Although various collapsible shopping carts have been previously manufactured to enable them to be conveniently carried and to occupy a small storage space, it has been found that they are mostly of intricate folding construction causing problems to the user. In addition, they are composed of many linking parts and so the electroplating thereof is easily damaged by friction in operation. Furthermore, the importance of the strength of the base support has been overlooked, resulting that they can no longer be folded after being used for a certain period of time. Moreover, the caster assembly of such carts is difficult to fit together and easy to drop out. 
     It is, therefore, an object of the present invention to provide an improved collapsible shopping cart which may obviate and mitigate the above-mentioned drawbacks. 
     SUMMARY OF THE INVENTION 
     This invention relates to an improved collapsible shopping cart. 
     It is the primary object of the present invention to provide a collapsible shopping cart which is simple in operation. 
     It is another object of the present invention to provide a collapsible shopping cart which is easy to operate. 
     It is still another object of the present invention to provide a collapsible shopping cart which is sturdy in construction. 
     It is still another object of the present invention to provide a collapsible shopping cart which can receive, store and transport heavy articles. 
     It is a further object of the present invention to provide a collapsible shopping cart the wheels of which are easy to be assembled. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a collapsible shopping cart according to the present invention; 
     FIG. 2 is a perspective view of the collapsible shopping cart in folded position; 
     FIG. 3 is a fragmentary view showing the structure of the base support; 
     FIG. 4 is a perspective view of the collapsible shopping cart in partially opened position; 
     FIG. 5 is an exploded view of a wheel assembly according to the present invention; 
     FIG. 6 shows the structure of inner end of the circular member of the wheel assembly; 
     FIG. 7 is a perspective view showing the assembly of the wheel; and 
     FIG. 8 shows an embodiment of the wheel assembly. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Before explaining the present invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawings, since the invention is capable of other embodiments and of beingpracticed or carried out in various ways. Also it is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. 
     The present invention is mainly characterized by two points; one is the base support, and the other is the caster assembly. 
     With reference now to the drawings and in particular to FIGS. 1 and 2 thereof, the basket 10 of the present invention can be collapsed in such away that the rear of the basket is held in substantially the same plane as the front of the basket while the front wheels 2 are held between the rearwheels 3. 
     Referring to FIG. 1, there is shown the present invention being in fully opened position. As illustrated, the present invention comprises a basket 10 having a front net 4, a lower net 5, a rear net 6 and an upper net 7 pivotally connected together. The front net 4 and the rear net 6 are joined together by a plurality of links 8. Two ends of the link 8 are bentso as to pass through corresponding holes of the front frame 41 and rear frame 61, and then pressed to make sure that they will not drop out of theframes 41 and 61. Thus, the ends of the links 8 may rotate with respect to the frames 41 and 61 thereby enabling the bracket 10 to be folded up. 
     Referring to FIG. 3, there is shown a fragmentary view showing the structure of the base support according to the present invention. The structure of the base support is the main characteristic of the present invention. As can be seen, there is a fixed rod 91 mounted above and in parallel to an axle 21. There is a distance between the fixed rod 91 and the front wheels 2 so that the rotation of the wheels 2 will not be effected. Furthermore, two swing plates 92 are connected across the fixed rod 91 and a transverse rod 93 located under the lower net 5. By means of the two swing plates 92, the present invention can receive heavy articles.It should be noted that, however, the number of the swing plates 92 dependson the weight desired to be supported by the shopping cart. 
     Looking now at FIG. 4, the present invention is shown in partially opened position. When the present invention is being collapsed, the links 8 will rotate about pivot 11 and the transverse rod 93 and the swing plates 92 will rotate with respect to the fixed rod 91. Hence, it is only necessary to pull up the front net 4 when desired to fold up the present invention. In addition, it is obvious that the present invention will not sustain high friction when opened and collapsed. 
     With reference to FIG. 1 again, when the present invention is opened, the longitudinal rods 51 of the net 5 will evenly locate on the fixed rod 91 and by means of the transverse rod 93 and the swing plates 92, the bracket10 can bear heavy loads without deforming. 
     Referring to FIG. 5, there is shown, the wheel assembly which is the secondcharacteristic of the present invention. As shown, the wheel assembly comprises a circular member 71, an axle 14 connected to the inner side of the circular member 71, and a clip 2 fastening the axle 14 to the circularmember 71. The axle 14 is formed with a slot 15 the outer diameter of whichis greater than hub (not shown) so that the axle 14 can be force-fitted thereon. 
     The structure of inner end of the circular member 71 is shown in FIG. 6. The inner end is provided with two protuberances 12 and 13; the lower one 12 is trapezoid while the upper one 13 is triangular. The protuberances 12and 13 are designed so that the clip 52 can be just fitted therewith. As seen, the concave portion of the clip 52 is fitted into an axle hole 151 of the axle 14. 
     In use, the present invention is first mounted at the center of the hub andthen inserted by a shaft 44. The shaft is provided with projections 42 at appropriate positions so as to prevent the axle 14 from dropping out. As aresult, the wheel can be safely kept in place. 
     Although this invention has been described with a certain degree of particularity, it is understood that the present disclosure is made by wayof example only and that numerous changes in the detail of construction andthe combination and arrangement of parts way be resorted to without departing from the spirit and scope of the invention as hereinafter claimed.