Abstract:
A trolley includes a main frame, a wheel device, a support frame attached to a front side of the main frame, and a foldable seat assembly attached to a rear side of the main frame. When the seat assembly is in an extended status, a second pair of stands secured to a first pair of stands contact the ground with the wheel device to provide a support for a seat device. When the seat assembly is in a folded status, the first and second pairs of stands fold close to the main frame.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a trolley for carrying luggage or the like, and in particular relates to a trolley with a foldable seat assembly on the rear side thereof. 
     2. Description of the Related Art 
     Trolleys are popular tools for carrying luggage or the like. However, in conventional trolleys with no attached seat, it is often inconvenient in crowded transportation terminals for the user to leave the trolley unattended to take a seat some distance away therefrom when he is tired. Since there are too many elements comprising a seat, no manufacturer has successfully combined a trolley and a seat without increasing the combined size thereof, yielding a storage burden. 
     It is the purpose of present invention, therefore, to mitigate and/or obviate the above-mentioned drawback in the manner set forth in detail description of the preferred embodiment. 
     SUMMARY OF THE INVENTION 
     The invention provides a trolley with a main frame, a wheel means, a support frame attached to a front side of the main frame, and a foldable seat assembly on a rear side thereof. The foldable seat assembly comprises a sleeve means slidably mounted on two outer vertical bars of the main frame, a seat means pivoted on the sleeve means, and two pairs of stands pivotally connected at their middle portions thereof. When the seat assembly is in an extended status, the lower ends of the first pair of stands are positioned on the ground, together with the wheels, to provide stable support. The upper ends of the second pair of stands contact the underside of a seat plate and thus support the seat plate. When the seat assembly is in a folded status, the first and second pairs of stands are folded closed to the main frame. 
     A primary object of the present invention is to provide a trolley having a foldable seat assembly attached to a rear side thereof which can be folded close to the trolley without increasing the overall size of whole structure. 
     Further objects and advantages of the present invention will become apparent as the following description proceeds, and the features of novelty which characterize the invention are pointed out with particularity in claims annexed to and forming a part of this invention. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a trolley with a foldable seat assembly in accordance with the present invention; 
     FIG. 2 is a perspective view of the foldable seat assembly of the trolley in accordance with the invention; 
     FIG. 3 is a schematic side view of the trolley in which the foldable seat assembly is in an extended status; 
     FIG. 4 is a schematic side view showing operation of folding the foldable seat assembly; and 
     FIG. 5 a schematic side view of the trolley with the foldable seat assembly in a folded status. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to FIG. 1, a trolley generally comprises a main frame 11, a wheel means 12, and a support frame 13. The main frame 11 has first and second outer vertical bars 111 and 112 and first and second inner vertical bars 111&#39; and 112&#39;: the latter respectively and slidably received in the former. The wheel means 12 is attached to the main frame 11, and the support frame 13 is securely attached to a bottom of the main frame 11 for carry articles. Such a structure is conventional and will not be further described. 
     The present invention is characterized in that a foldable seat assembly 20 is attached to a rear side of the trolley. The foldable seat assembly 20 comprises a sleeve means 21 slidably mounted on the first and second outer vertical bars 111 and 112, a seat means 22 pivoted to the sleeve means 21, a first pair of stands 23, and a second pair of stands 24. 
     Referring to FIG. 2, the seat means 22 includes a first seat-supporting member 221 pivoted to the sleeve means 21 at a first end thereof, a second seat-supporting member 222 also pivoted to the sleeve means 21 at a first end thereof, a connecting member 223 which has a first end fixed to a middle portion of the first seat-supporting member 221 and a second end fixed to a middle portion of the second seat-supporting member 222, a first swaying member 224 having a first end pivoted to the first end of the first connecting member 223 and a second end with a first hole (not labeled), a second swaying member 225 having a first end pivoted to the second end of the connecting member 223 and a second end with a hole (not labeled), a linking rod 226 passing through the first and second holes, and a seat plate 229 fixed on top sides of the first and second seat-supporting members 221 and 222. The first and second swaying members 224 and 225 are pivotable about the linking rod 226, which will be discussed later. 
     Still referring to FIGS. 1 and 2, the first pair of stands 23 has a first stand 231 with an upper end pivoted to the sleeve means 21, a second stand 232 with an upper end pivoted to the sleeve means 21, and a first cross member 233 connecting the first and second stands 231 and 232. The second pair of stands 24 consists of a third stand 242, a fourth stand 243, and a second cross member 113 securely attached to the outer vertical bars 111 and 112 for connecting the third and fourth stands 242 and 243. The third and fourth stands 242 and 243 are pivoted about the second cross member 113. In addition, a middle portion of first stand 231 pivoted with a middle portion of the third stand 242 by means of a bolt 241 or other suitable means. A middle portion of the second stand 232 is pivoted with middle portion of the fourth stand 243 by means of a second bolt (not labeled) or other suitable means. A first retaining ring 261 is provided between the pivot point (not labeled) of the first and third stands 232 and 242 around the bolt 241. A second retaining ring (not labeled) is provided between the pivot points (not labeled) of the second and fourth stands 232 and 243. Optionally, the connecting members 223 can be attached to the swaying members 224 and 225 by means of screws. A cutout 227 is formed in each seat-supporting members 221 and 222 so as to facilitate the engagement of connecting member 223 to the swaying members 224 and 225. 
     In use, as illustrated in FIG. 3, the foldable seat assembly 20 is in an extended status for a user to sit thereon. The lower ends of the first pair of stands 23 stand on the ground, together with the wheels 12 to provide stable support. The upper ends of the second pair of stands 24 contact an underside of the seat plate 229 and thus support the seat plate 229. 
     For folding the seat assembly 20, the user may lift the seat plate 229 together with the first and second seat-supporting members 221 and 222 along a direction indicated by arrow A until the second pair of stands 24 is substantially in alignment with the swaying members 224 and 225, as shown in FIG. 4 (note that the first and second swaying members 224 and 225 are pivoted to abut the linking rod 226). At the same time, the sleeve means 21 slides slightly downward. Then, the seat plate 229 and the seat supporting members 221 and 222 are pushed along a direction indicated by arrow B until the seat-supporting members 221 and 222 against the second pair of stands 24. Therefore, pushing the seat plate 229 folds the whole seat assembly 20 to a folded status shown in FIG. 5, in which the sleeve means 21 slides upward along the outer vertical bars 111 and 112. It is noted that the retaining rings 26 engage with the cutout 228 so that the folded seat assembly does not rattle or shake. 
     For extending (unfolding) the folded seat assembly 20 shown in FIG. 5 to the extended status shown in FIG. 3, the user may pull the lower end of the seat plate 229 along a direction indicated by arrow C until the second pair of stands 24 substantially in alignment with the swaying members 224 and 225 is shown in FIG. 4. Then, the pivoting point is pulled outward along a direction indicated by arrow D to the extended status shown in FIG. 3. In this position the upper ends of the third stand 242 and fourth stand 243 contact an underside of the seat plate 229 to provide a stable seat on which the user may sit. 
     As various possible embodiments might be made of the above invention without departing from the scope of the invention, it is to be understood that all matter herein described or shown in accompanying drawing is to be interpreted as illustrative and not in a limiting sense. Thus it will be appreciated that the drawing are exemplary of a preferred embodiment of the invention.