Abstract:
A cart capable of being combined to a bicycle comprises a cart body having a frame portion; at least one front wheel arranged below the frame portion for driving the cart body; the at least one front wheel being at a front portion thereof; and wherein the cart has a combination structure for combining the cart to a bicycle so that the cart is able to be driven by the bicycle. Furthermore, the cart further comprises a steering structure for controlling moving directions of the cart so that when the cart is connected to a bicycle, the steering structure can control the moving direction of the cart. The frame portion has a bottom plate put thereon for carrying object thereon. The frame portion includes a back frame; and the combining structure is installed at a handle linkage of the cart body.

Description:
FIELD OF THE INVENTION 
     The present invention relates to carts, and in particular to a cart capable of being combined to a bicycle 
     BACKGROUND OF THE INVENTION 
     Currently, more and more old people or babies or enabled peoples or patients cannot move by themselves. They must be carried by wheelchairs. Sometimes, people use cart (or wagons) to transfer pets or goods, while theses works need to apply manpower to wheelchairs, carts, or wagons. Since great manpower needs to drive the wheelchairs, carts, or wagons, the moving ranges of these vehicles are confined to be nearby of the driving people. A frequent event is to transfer the old people or babies to a park for sunny. The servant will feel ill at ease due to a great power being applied, but the wheelchair only be moved within finite ranges. 
     Therefore, if it is desired to improve the aforementioned defects in the prior art, an easy way is to combine the cart to a bicycle which is frequently used in daily life with a very lower cost. If it wants to do so, it is needed to improve the structure of the cart so that the cart can be combined with a bicycle. Therefore, the structure of the cart is needed to be modified so that it is able to be combined to a bicycle easily and fast for carrying goods or people. 
     SUMMARY OF THE INVENTION 
     Accordingly, the object of the present invention is to provides a cart capable of being combined to a bicycle, wherein the present invention provides a simple and easily attached and detached structure for combing a cart to a bicycle so the cart can be driven by the bicycle. As a result the cart is able by driven with a fast speed and power being saved. Furthermore, enabled old people or child, or goods can be transferred easily with less power and time. Furthermore, the people and goods can be safely transferred. 
     To achieve above object, the present invention provides a cart capable of being combined to a bicycle comprises a cart body ( 2 ) having a frame portion ( 32 ); at least one front wheel ( 21 ) arranged below the frame portion ( 32 ) for driving the cart body ( 2 ); the at least one front wheel ( 21 ) being at a front portion of the frame portion ( 32 ); and wherein the cart has a combination structure for combining the cart to a bicycle so that the cart is able to be driven by the bicycle. Furthermore, the cart further comprises a steering structure for controlling moving directions of the cart so that when the cart is connected to a bicycle, the steering structure can control the moving direction of the cart; wherein the at least on front wheel is two front wheels ( 21 ); the frame portion ( 32 ) has a bottom plate ( 31 ) put thereon for carrying object thereon; the frame portion ( 32 ) includes a back frame ( 321 ); and the combining structure is installed at a handle linkage ( 24 ) of the cart body. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view showing the bicycle used in the present invention. 
         FIG. 2  is a perspective view showing the structure of the cart of the present invention. 
         FIG. 3  is a perspective view includes the steering structure of the present invention. 
         FIG. 4  is a lateral view about the steering structure of the present invention. 
         FIG. 5  is a lateral view of the cart of the present invention. 
         FIG. 6  is a structural vie about the combination of the cart and a bicycle according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims. 
     With reference to  FIGS. 1 to 6 , a cart capable of being connected to a bicycle of the present invention is illustrated. In the present invention, the cart may be a wheelchair, a wagon, a cart for carrying pets or goods, etc. All these are within the scope of the present invention. 
     In the present invention, the cart is use to a bicycle  1 . As illustrated in  FIG. 1 , the bicycle  1  has a backbone  10 , a handle  11 , a cushion  12 , a front wheel  13  and a rear wheel  14 . The backbone  10  serves to assemble related components of the bicycle  1 . The handle  11 , the cushion  12 , the front wheel  13  and the rear wheel  14  are assembled to the backbone  10 . The backbone  20  has a main tube  15  installed between the front wheel  13  and the rear wheel  14 . 
     Preferably, the rear wheel  14  of the bicycle  1  is greater than the front wheel  13 , or the front wheel  13  is foldable so that the rear wheel  14  can grounded. 
     The cart  2 , with reference to  FIG. 2 , includes a framework, two front wheels  21 , two rear wheels  22 , a handle linkage  24 , a bike linkage  25 , and a steering structure. 
     The framework has a bottom plate  31  and a frame portion  32 . The bottom plate  31  serves to carry objects thereon. The frame portion  32  further has a back frame  321  capable of being combined to the bottom plate  31 , and two lateral frames  322  at two lateral sides of the back frame  321  and adjacent to the back frame  321 . 
     The two front wheels  21  and two rear wheels  22  are installed at a front and a rear side below the framework, respectively, so that the cart  2  is movable. The bottom plate  31  has the effect of carrying objects thereon. Preferably, a cushion (not shown) can be placed on the bottom plate  31  for seating by people. The frame portion  32  has a rod structure assembled a plurality of rods. The bottom plate  31  is fixed to the frame portion  32 . The frame portion  32  has the effect of protecting objects or peoples thereon to prevent the objects from falling out. 
     Preferably, the sizes of the two front wheels  21  of the cart  2  are greater than that of the two rear wheels  22  thereof. 
     A handle linkage  24  is a T rod including a transversal rod  242  and a straight rod  241  connected to an approximate center of the transversal rod  242 . A bottom end of the straight rod  241  is fixedly connected to a rear end of the frame portion  32 . Two ends of the transversal rod  242  have respective hooks  243  for hanging to the handle  11  of the bicycle  1 . The handle linkage  242  of the cart  2  are connected to the handle  11  of the bicycle  1  so that the cart  2  is connected to the bicycle  1 . By this structure, the bicycle  1  will drive the cart  2  to move forwards. 
     The handle linkage  24  is connected to the handle  11  of the bicycle  1  by various different ways, which are not confined to above mentioned structure. Other ways capable of connecting the handle linkage  24  to the handle  11  of a bicycle  1  is within the scope of the present invention, for example, the hook is replaced by a screw or a stud. 
     The bicycle linkage  25  is a straight rod connected to the handle linkage  24 . One end of the bicycle linkage  25  is connected to the handle linkage  24  by using a rotatable joint. The bicycle linkage  25  has at least one hooks  251  (in the drawing, two hooks are displayed) for hooking the main tube  15  of the bicycle  1 . Therefore, the cart  2  is fixable to the main tube  15  of the bicycle  1 . Therefore, the bicycle  1  can drive the cart  2 . 
     The bicycle linkage  25  is connectable to the main tube  15  by various ways and is not confined to above mentioned way, for example, the hook  251  is replaced by a screw or a stud. 
     With reference to  FIGS. 2, 3, 4, and 5 , the steering structure of the present invention includes: 
     A steering assembly includes a steer handle  41 , an L shape transferring rod  42 , at least one transversal rod  43  (two transversal rods  43  are illustrated), two extending rods  44 , a second turning linkage  51 , a first sleeve  71 , a second sleeve  72  and a third sleeve  73 . 
     The transversal rod  42  is connected between the first turning sleeve  71  and the second turning sleeve  72 . The second sleeve  72  is fixed to an upper end of the backside of the frame portion  32  of the cart  2  and the third sleeve  73  is fixed to a lower end of a backside of the frame portion  32  of the cart  2 . The transferring rod  42  passes through the second sleeve  72  and the third sleeve  73 . 
     A transversal bar of the steering handle  41  is used as a handle of the steering structure. A straight bar of the steering handle  41  passes through the first sleeve  71  and is retained thereon so that it is rotatable within the first sleeve  71 . 
     The transferring rod  42  is rotatable within the second sleeve  72  and the third sleeve  73 . A lower end of the transferring rod  42  has a bending portion and a bar  81  protruding from the bending portion. Preferably, the second sleeve  72  has a protruding rod  91  for being connected to the back frame  321  of the frame portion  32 . 
     Distal ends of the two extending rods  44  have respective protruding bars  83 ,  84 . A head of one extending rod  44  is extended from a lower end of the steering handle  41  at a position lower than the first sleeve  71 . Another extending rod  44  has a head extended from the transferring rod  42  at a position lower than the second sleeve  72 . 
     Two ends of the first turning linkage  51  are formed with respective holes for receiving the protruding bars  83 ,  84  of the extending rods  44 . A middle section of the first turning linkage  51  has a through hole for receiving a first shaft  52 . Thereby, the first turning linkage  51  is fixed to the first shaft  52  and is rotatable along the first shaft  52 . The first shaft  52  is retained to middle sections of the two transversal rods  43  of the steer assembly. When a user rotates the steering handle  41 , the first turning linkage  51  will rotate to drive the transferring rod  42 . 
     A second turning linkage  53  is a long straight rod body. A middle section of the second turning linkage  53  has a through hole for passing through a second shaft  54 . An upper end of the second shaft  54  is fixed to the bottom plate  31  of the framework. Thereby, the second turning linkage  53  will rotate along the second shaft  54 . Two ends of the second turning linkage  53  have respective holes. 
     A transversal driving bar  6  is a long bar. A middle section of the transversal driving bar  6  has a second protruding bar  82 . Each of two ends of the transversal driving bar  6  has a respective turning arm  61  which is fixedly connected to the turning shaft  62 . When the turning arm  61  moves, the turning shaft  62  will rotate therewith. The turning shaft  62  passes through a fourth sleeve  74  which is fixedly connected to the frame portion  32  of the cart  2 . One end of the turning shaft  62  will rotate along the fourth sleeve  74  and another end of the turning shaft  62  is connected to one of the front wheel  21  of the cart  2 . 
     The first protruding bar  81  extended from a bending portion at the lower end of the transferring rod  42  passes through the hole at a head of the second turning linkage  53 . The hole at a tail end of the second turning linkage  53  receives the second protruding bar  82  of the transversal driving bar  6 . When the transferring rod  42  rotates, the transversal driving bar  6  will be driven to move. 
     The transversal driving bar  6  can be driven to move leftwards or rightwards to drive the turning arms  61  and then to rotate the turning shafts  62 . The rotation of the turning shafts  62  will cause the two front wheels  21  of the cart  2  to rotate therewith. 
     With reference to  FIG. 6 , operation of the present invention will be described herein. 
     Firstly, the hooks  243  of the handle linkage  24  of the cart  2  are hooked to the handle  11  of the bicycle  1  so that the cart  2  is connected to the bicycle  1 . As a result, the bicycle  1  can drive the cart  2  to move forwards. 
     Secondly, the at least one hook  251  of the bicycle linkage  25  is hooked to the main tube  15  of the bicycle  1  so that the cart  2  is connected to the main tube  15  of the bicycle  1 . Thus the cart  2  is firmly secured to the bicycle  1  for being driven to move. 
     After the cart  2  is combined with the bicycle  1 , the bicycle  1  can drive the cart  2  to move. 
     In the present invention, it is suggested that the rear wheel  14  of the bicycle  1  is greater than the front wheel  13  thereof, or the front wheel  14  of the bicycle  1  is foldable. After folding the front wheel  14 , only the rear wheel  22  grounds. Furthermore, it is preferable, the size of the front wheels  21  of the cart  2  is greater than that of the rear wheels  22  of the cart  2 . Thus, when the cart  2  is combined to the bicycle  1 , the front wheel  13  of the bicycle  1  and the rear wheels  22  of the cart  2  are then not grounded and only the rear wheel  14  of the bicycle  1  and the two front wheels  21  of the cart  2  ground for movement. 
     The driver of the bicycle  1  can hold the steering handle  41  of the cart  2  for controlling the moving direction of the combination structure of the cart  2  with the bicycle  1 . 
     Advantages of the present invention are that the present invention provides a simple and easily attached and detached structure for combing a cart to a bicycle so the cart can be driven by the bicycle. As a result the cart is able by driven with a fast speed and power being saved. Furthermore, enabled old people or child, or goods can be transferred easily with less power and time. Furthermore, the people and goods can be safely transferred. 
     The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.