Abstract:
A baby buggy having a frame structure that can be folded quickly, easily, and in a small frame volume.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a baby buggy. 
     DESCRIPTION OF THE RELATED ART 
     In the prior art, a baby buggy generally comprises a foldable frame and wheel assemblies disposed at the bottom of the frame, wherein the frame is locked by a locking device when it is unfolded. Furthermore, the buggy frame foldable can be constructed in various ways to make itself able to be folded. However, in the industry development of baby buggy, it is an object being worth seeking and searching to make the folding of the buggy frame easier and the frame volume after folding be smaller and the like. 
     SUMMARY OF THE INVENTION 
     The technical problem to be solved by the invention is to provide a baby buggy which can be folded quickly and easily. 
     In order to solve the above technical problem, the present invention provides the following technical solution: a baby buggy comprising a foldable frame, a locking device for locking the frame, wheel assemblies disposed at the bottom of the frame and a seat set on the frame, wherein the frame comprises a front wheel bracket; a right rear wheel bracket, which has an upper portion being rotatably connected to a rear portion of the front wheel bracket by a first rotating shaft; a left rear wheel bracket, which has an upper portion being rotatably connected to the rear portion of the front wheel bracket by a second rotating shaft; a right push rod; a right push rod; a right rear supporting rod, which has an upper portion being rotatably connected to the right push rod by a seventh rotating shaft, and a lower portion being rotatably connected to the rear portion of the front wheel bracket by a third rotating shaft; a left rear supporting rod, which has an upper portion being rotatably connected to the left push rod by an eighth rotating shaft, and a lower portion being rotatably connected to the rear portion of the front wheel bracket by a fourth rotating shaft. The front wheel bracket has front wheel rods extending along an anteroposterior direction. The front wheel rods are provided with a sliding part slidably arranged thereon, the sliding part being rotatably connected to a first driving rod by a fifth rotating shaft. The first driving rod has an upper portion being rotatably connected to a lower portion of the right push rod by a ninth rotating shaft, and has a lower portion being rotatably connected to the left rear wheel bracket by a twelfth rotating shaft. The sliding part is also rotatably connected to a second driving rod by a sixth rotating shaft. The second driving rod has an upper portion being rotatably connected to a lower portion of the left push rod by a tenth rotating shaft, and has a lower portion being rotatably connected to the right rear wheel bracket by an eleventh rotating shaft. 
     According to a specified embodiment of the present invention, the axes of the second rotating shaft, the third rotating shaft, the fifth rotating shaft, the seventh rotating shaft, the ninth rotating shaft and the twelfth rotating shaft are parallel to each other and a first plane perpendicular to such axes intersects with a second plane which is perpendicular to the axes of the first rotating shaft, the fourth rotating shaft, the sixth rotating shaft, the eighth rotating shaft, the tenth rotating shaft and the eleventh rotating shaft which are parallel to each other. owning to the intersecting of the first and second planes, the left push rod and the right push rod draw close to each other when moving forwards, and the left rear wheel bracket and the right rear wheel bracket also draw close to each other when turning forwards, thus, the frame volume can be reduced not only in up-down, front-back directions but also in left-right direction. 
     According to a more specific embodiment of the present invention, the frame also includes a foldable transverse brace for laterally supporting the left push rod and the right push rod. 
     According to a more specific embodiment of the present invention, the frame also includes a right push handle with its lower end being rotatably connected to an upper end of the right push rod, and a left push handle with its lower end being rotatably connected to an upper end of the left push rod, wherein the two ends of the transverse brace is respectively rotatably connected to the right push handle and the left push handle. 
     According to a specified embodiment of the present invention, the third rotating shaft is located above the first rotating shaft, and the fourth rotating shaft is located above the second rotating shaft. 
     According to a specific embodiment of the present invention, the front wheel rods include a left front wheel rod positioned at the left side of the front wheel bracket and a right front wheel rod positioned at the right side of the front wheel bracket. Furthermore, the left front wheel rod and the right front wheel rod are respectively inserted into a left through hole and a right through hole respectively being opened at left and right sides of the sliding part. 
     According to a more specific embodiment of the present invention, the left front wheel rod and the right front wheel rod are fixed to each other forming a whole. 
     According to a more specific embodiment, the first driving rod and the second driving rod are situated between the left front wheel rod and the right front wheel rod. 
     According to a specific embodiment, the front wheel bracket further includes a connecting seat positioned at its rear portion, and the connecting seat is connected fixedly to the front wheel rods. 
     According to a specific embodiment, the first driving rod is rotatably connected to the right side of the sliding part by a fifth rotating shaft, and the second driving rod is rotatably connected to the left side of the sliding part by a sixth rotating shaft. 
     The scope of the invention is not limited to the technical schemes combined particularly by the above-mentioned technical features, other technical schemes combined discretionarily by the above-mentioned technical features or equivalent features should also be covered in the present invention, such as the technical schemes formed by exchanging the aforementioned features with the technical features having the similar functions, including but not limited to, disclosed in the invention. 
     Due to utilizing the above technical solution, the present invention has the following advantages as compared with the prior art: in the course of folding, pressing down the right push rod and left push rod make both the right rear supporting rod and left rear supporting rod turn forwards, meanwhile, the right push rod and left push rod respectively drives the first driving rod and the second driving rod aslant moving downwards and forwards, and thus drives the sliding part sliding down along the front wheel rods, and the left rear wheel bracket and the right rear wheel bracket turn forwards until the folding is achieved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a baby buggy in an unfolded status with omitting the right push rod; 
         FIG. 2  is a perspective view of a baby buggy in an unfolded status; 
         FIG. 3  is a front view of a baby buggy in an unfolded status; 
         FIG. 4  is the view A of the  FIG. 1 . 
         FIG. 5  is a perspective view of a baby buggy in the course of transformation from an unfolded status to a folded status; 
         FIG. 6  is a front view of a baby buggy in the course of converting from an unfolded status to a folded status; 
         FIG. 7  is a perspective view of a baby buggy in the course of converting from an unfolded status to a folded status, with omitting the right push rod; 
         FIG. 8  is a perspective view of a baby buggy in an unfolded status; 
         FIG. 9  is a front view of a baby buggy in a folded status; 
         FIG. 10  is a front view of a baby buggy in a folded status with omitting the right push rod; 
     
    
    
     Wherein,  1 . a front wheel bracket;  2 . a connecting seat;  3 . right rear wheel bracket;  5 . left rear wheel bracket;  6 . a right push rod;  7 . a left push rod;  8 . a sliding part;  9 . a right rear supporting rod;  10 . a left front wheel rod;  11 . a left rear supporting rod;  12 . a first driving rod;  13 . a second driving rod;  14 . front wheel assemblies;  15 . a right rear wheel assembly;  16 . a left rear wheel assembly;  17 . a transverse brace;  18 . a right push handle;  19 . a left push handle;  20 . a right front wheel rod;  21 . a first rotating shaft;  22 . a second rotating shaft;  23 . a third rotating shaft;  24 . a fourth rotating shaft;  25 . a fifth rotating shaft;  26 . a sixth rotating shaft;  27 . a seventh rotating shaft;  28 . a eighth rotating shaft;  29 . a ninth rotating shaft;  30 . a tenth rotating shaft;  31 . a eleventh rotating shaft;  32 . a twelfth rotating shaft; a. a first plane; b. a second plane. 
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to the embodiments shown in  FIGS. 1 to 10 , the baby buggy comprises a frame provided with an unfolded position and a folded position; front wheel assemblies  14 ; a right rear wheel assembly  15 ; a left rear wheel assembly  16 ; a locking device for locking the frame in an unfolded position; and a seat (not shown) set on the frame for children sitting or lying. The words of “front”, “rear”, “left” and “right” referring to orientation herein and hereinafter are defined according to the impression of a user, the further side from he/she is designated as “front”, the side adjacent to he/she is designated as “rear”, the side on his/her left is designated as “left”, and the side on his/her right is designated as “right”. 
     As shown in figures, the frame comprises: 
     a front wheel bracket  1  having front wheel rods extending along an anteroposterior direction, the front wheel assemblies  14  are arranged below the front portions of which, in this embodiment, two front wheel assemblies  14  are respectively arranged below the front portions of the left and right sides of the front wheel bracket  1 ;
 
a right rear wheel bracket  3 , the upper portion of which is rotatably connected to the right side of the rear portion of the front wheel bracket  1  by a first rotating shaft  21 , and the lower portion of which is provided with the right rear wheel assembly  15 ;
 
a left rear wheel bracket  5 , as shown in  FIG. 4 , the upper portion of which is rotatably connected to the left side of the rear portion of the front wheel bracket  1  by a second rotating shaft  22 , and the lower portion of which is provided with the left rear wheel assembly  16 ;
 
a right push rod  6 ;
 
a left push rod  7 ;
 
a sliding part  8 , which is slidably arranged on the front wheel rods along the anteroposterior direction thereof;
 
a right rear supporting rod  9 , the upper portion of which is rotatably connected to the right push rod  6  by a seventh rotating shaft  27 , and the lower portion of which is rotatably connected to the right side of the rear portion of the front wheel bracket  1  by a third rotating shaft  23 ;
 
a left rear supporting rod  11 , the upper portion of which is rotatably connected to the left push rod  7  by a eighth rotating shaft  28 , and the lower portion of which is rotatably connected to the left side of the rear portion of the front wheel bracket  1  by a fourth rotating shaft  24 ;
 
a first driving rod  12 , as shown in  FIG. 3 , being rotatably connected to the sliding part  8  by a fifth rotating shaft  25 , the upper portion of which is rotatalby to the lower portion of the right push rod  6  by a ninth rotating shaft  29 , as shown in  FIGS. 4-5 , and the lower portion of which is rotatably connected to the left rear wheel bracket  5  by a twelfth rotating shaft  32 ;
 
a second driving rod  13  being rotatably connected to the sliding part  8  by a sixth rotating shaft  26 , the upper portion of which is rotatably connected to the lower portion of the left push rod  7  by a tenth rotating shaft  30 , and the lower portion of which is rotatably connected to the right rear wheel bracket  3  by a eleventh rotating shaft  31 ; As shown in  FIGS. 2-4 , the shaft axes of the second rotating shaft  22 , third rotating shaft  23 , fifth rotating shaft  25 , seventh rotating shaft  27 , ninth rotating shaft  29  and the twelfth rotating shaft  32  are parallel to each other, and the plane perpendicular to such shaft axes is defined as a first plane a, as shown in  FIG. 4 , the shaft axes of the first rotating shaft  21 , fourth rotating shaft  24 , sixth rotating shaft  26 , eighth rotating shaft  28 , tenth rotating shaft  30  and the eleventh rotating shaft  31  are parallel to each other, and the plane perpendicular to such shaft axes is defined as a second plane b, wherein the first plane a and second plane b intersects with each other.
 
     The frame also includes a transversely foldable transverse brace  17  which make the rigidity during the right push rod  6  and the left push rod  7  stronger when the frame is in an unfolded position. 
     As shown in figures, the frame also comprises a right push handle  18  with the lower end being rotatably connected to the right push rod  6 , and a left push handle  19  with the lower end being rotatably connected to the upper end of the left push rod  7 , wherein the right end of the transverse brace  17  is rotatably connected to the right push handle  18 , and the left end of the transverse brace  17  is rotatably connected to the left push handle  19 , in the course of frame folding, the right push handle  18  folds towards the right push rod  6 , and the left push handle  19  folds towards the left push rod  7 , the volume of the frame becomes smaller after folding. Alternatively, the right push handle  18  is slidably connected to the right push rod  6 , and the left push handle  19  is slidably connected to the left push rod  7 , thus, the volume of frame after folding can be reduced by shrinking slidably. Or alternatively, the right push handle  18  and the right push rod  6  are one-piece, and the left push handle  19  and the left push rod  7  are one-piece, thus, the volume of the frame after folding is big. The transverse brace  17  includes a first transverse brace rod and a second transverse brace rod, wherein the inner end of the first transverse brace rod is rotatably connected to the inner end of the second transverse brace rod, and the outer end of the first transverse brace rod is rotatably connected to the right push handle  18 , and the outer end of the second transverse brace rod is rotatably connected to the left push handle  19 . The transverse brace  17  also can be arranged between the left push rod  7  and the right push rod  6 . 
     The third rotating shaft  23  is located above the first rotating shaft  21 , and the fourth rotating shaft  24  is located above the second rotating shaft  22 . 
     The front wheel rods include a left front wheel rod  20  positioned at the left side of the front wheel bracket  1  and a right front wheel rod  10  positioned at the right side of the front wheel bracket  1 . The left front wheel rod  20  and the right front wheel rod  10  are set fixedly forming a whole. A left through hole and a right through hole respectively are opened at the left and right sides of the sliding part  8 , the left front wheel rod  20  is inserted into the left through hole and the right front wheel rod  10  is inserted into the right through hole. The first driving rod  12  and the second driving rod  13  are situated between the left front wheel rod  20  and the right front wheel rod  10 . The front wheel bracket  1  further includes a connecting seat  2  positioned at the rear portion thereof, the connecting seat  2  is connected fixedly to the front wheel rods. 
     The first driving shaft  12  is rotatably connected to the right side of the sliding part  8  by a fifth rotating shaft  25 , and the second driving shaft  13  is rotatably connected to the left side of the sliding part  8  by a sixth rotating shaft  26 . 
     In the course of folding, pressing down the right push rod  6  and left push rod  7  make both the right rear supporting rod  9  and left rear supporting rod  11  turn forwards, meanwhile, the right push rod  6  and left push rod  7  respectively drives the first driving rod  12  and the second driving rod  13  moving downwards, and thus drives the sliding part  8  sliding down, and the left rear wheel bracket  3  and the right rear wheel bracket  5  turning forwards, besides, the right rear wheel bracket  3  and the left rear wheel bracket  5  draw close to each other, the right push rod  6  and the left push rod  7  draw close to each other, and the right rear supporting rod  9  and the left rear supporting rod  11  also draw close to each other, and accordingly the folding is achieved. The volume of frame after folding is small. 
     As described above, the detailed description is illustrated according to the spirit of the invention fully, but the present invention is not limited to the aforementioned embodiments and implementing methods. Many variations and implements can be made within the scope of the invention by those skilled in the related art.