TWM554741U - Stroller frame - Google Patents

Description

Baby carriage frame

The present invention relates to a stroller, and more particularly to a stroller frame having a deploying and folding function in the stroller.

The structure of the existing baby carriage frame mainly comprises a frame body having a plurality of folded joints, and a front wheel is arranged on each of the left and right sides of the bottom front end of the frame body, and the left and right sides of the bottom rear end of the frame body Each of the stroller frames is provided with the frame body having a plurality of folded joints, so that the stroller frame can be unfolded and folded, and after deployment, the infant ride can be provided for the adults to move on the road surface. Baby stroller; after folding, it can reduce the space occupied by the stroller frame for easy collection and handling.

However, in the existing baby carriage frame construction, in order to provide good stability and steering flexibility during the movement, in general, the distance between the rear wheels of the baby carriage frame must be greater than the distance between the two front wheels. Due to the folding mechanism of the existing baby carriage frame, the front and rear bending and folding functions can be generated by using the frame body with multiple folding joints. Therefore, when the baby carriage frame is folded, the distance between the two is wide. The wheel must be located behind or outside the two front wheels with narrow spacing, resulting in a large overall width of the stroller frame after folding, which is difficult to reduce to a small volume, and has a problem of space. Moreover, in the existing stroller frame, the supporting mechanism for providing infants and toddlers can still be provided with the bearing capacity provided by the simple connecting rod assemblies on both sides.

The main purpose of the present invention is to provide a stroller frame. After the existing stroller frame is folded, the two rear wheels are respectively located outside the two front wheels, and it is difficult to reduce the space and volume occupied by the folding.

In order to achieve the foregoing object, the baby carriage frame provided by the present invention comprises: a frame body comprising a front wheel frame, a pad support frame, two first joint components, one pad plate, and two side diagonal bars. a second joint assembly, a handle, a first crossbar, a second crossbar, and a linkage axle, the front axle frame comprising two front and rear opposing rails extending obliquely from the rear to the rear, the cushion support bracket The two first joint assemblies are disposed on the left and right front frame rods of the front wheel frame, and the seat cushions are disposed on the seat cushion support frame, and the two side diagonal rods are respectively disposed on the two first joint assemblies. The second joint assembly is respectively configured with an upper end of the two side slanting rods, the handle comprises a handle crossbar having an operation component, and two shanks extending downward from the left and right ends of the handle rail respectively. The lever portion is respectively connected to the two second joint assemblies, and the operating component of the handle rail can control the first joint assembly and the second joint assembly, and the first rail and the second rail are disposed on the seat cushion Below the support frame, and the second crossbar is disposed in parallel a front side of the crossbar, the first crossbar is laterally connected between the two first joint assemblies, and the second crossbar is connected between the left and right front masts of the front wheel frame, the linkage shaft is provided The front wheel is disposed below the bottom surface of the back plate and is connected between the two first joint assemblies and is coupled with the first joint assembly; the two front wheel sets are respectively pivoted on the left and right sides of the front end of the frame body, the front wheel The group includes a front wheel base and a front wheel pivoted in the front wheel base, and the front wheel base is pivoted on the front wheel frame of the frame body; a pad support mechanism is movably assembled on the frame body Below the seat cushion, the seat cushion support mechanism includes a first curved plate, a second curved plate and a support plate, the first curved plate top end pivotally connected to the bottom surface of the seat cushion, the second The bottom end of the curved plate is pivotally connected to the second cross bar, the top end of the support plate is connected to the linkage shaft, the lower portion of the first curved plate, the top end of the second curved plate and the bottom end of the support plate are a pivotal coaxial connection; and a rear wheel folding mechanism is disposed on the frame body Side, the folding mechanism comprises two rear wheel frame and two linkage groups, wherein: The two rear wheel frame sets are movably assembled on the first crossbar of the frame body, and the rear wheel frame sets each include a rear wheel, a rear wheel base, a wheel bar and a connecting seat, and thereafter The wheel has an axle, and the axle is pivoted on one side of the rear wheel seat, the wheelbar is fixed to the top of the rear wheel seat, and the center line of the wheel has an acute angle with respect to the center line of the axle of the rear wheel The connecting seat is pivotally connected to the upper end of the wheel bar and is obliquely fixed to the first cross bar. The connecting seat comprises a pivoting portion and a fixing portion and a stopping portion respectively located at the upper ends of the pivoting portion The connecting seat is fixed to the first crossbar by the fixing portion, and the pivoting portion of the connecting seat is pivotally connected to the upper end of the wheel bar by a pivot post, the stopping portion is located behind the upper end of the wheel bar, and The angle of rotation of the wheel bar relative to the connecting seat is restricted, and the connecting seat of the two rear wheel frame sets is inclined from the top to the bottom, and the two-wheeled rod is formed by the front end toward the upper side by the obliquely disposed connecting seat The rear end is gradually inclined and symmetrical, so that the two rear wheel frames are in an unfolded state, and between the two rear wheels The distance between the two front wheels is greater than the distance between the two front wheels, and the two rear wheel frames are placed in a folded state, and the two rear wheels are disposed at a position between the two front wheels; The two ends of the second crossbar of the frame body are located outside the wheel bars of the two rear wheel frame groups and are connected to the corresponding wheel bars, and the link groups each include a first link and a second link. a first multi-directional connector and a second multi-directional connector, one end of the first link is connected to the second cross bar, and the other end of the first link is coupled to the second connector by a first multi-directional connector One end of the rod, the other end of the second link is coupled to the middle portion of the wheel rod in conjunction with the second multi-directional joint.

By preliminarily exposing the overall composition of the baby carriage frame, the main purpose is to utilize a rear wheel folding mechanism connected to the rear side of the frame body, and the rear wheel folding mechanism can be bent and inclined by the two rear wheel frame groups. Aligned symmetrically on the first crossbar of the frame body, and further utilizes a link set including two links and two multidirectional connectors, the two links being connected to the wheel bars of the two rear wheel sets Between the second crossbar and the second crossbar of the frame body, according to the figure, when the stroller frame is in the unfolded state, the connecting wheel can be extended toward the outside by the connecting brackets of the two rear wheel frame groups. Having the positions of the two rear wheels reach a position where the two wheel spacing is greater than the distance between the two front wheels, and at the same time by being respectively connected to the two ends of the two cross bars and the two rear wheel frame groups The connecting rod group between the middle portions of the wheel rod is in an extended state, and provides supporting force to the rearwardly extending wheel rod; on the other hand, the baby carriage frame is located on the frame body by using the foldable seat cushion supporting mechanism The middle is connected with the bottom of the seat cushion, the linkage shaft, the first crossbar and the second crossbar, and forms a multi-point support mechanism capable of unfolding and folding, and provides a stable auxiliary support force to the seat cushion. Thereby, the rear wheel folding mechanism is deployed in a stable stretch state on the stroller frame, so that the stroller frame can be smoothly moved on the ground.

When the stroller frame is folded, the rear wheel folding mechanism can be folded by the two link groups to drive the wheel bars of the two rear wheel frame groups to connect the pivot posts in the pivoting portion of the seat Cooperating with the front center of the rotating center toward the front, and utilizing the first multi-directional connecting member connected between the first link and the second connecting rod and connecting the second connecting rod and the wheel bar a second multi-directional connecting member between the two rear wheel frame groups in the process of folding forward, and simultaneously guiding the left and right second wheel rods to form a motion that is oppositely merged in the middle direction, so that the left and right rear wheels can be moved Between the two front wheels, the folding of the stroller frame is greatly reduced by the overall width and volume, thereby overcoming the folding of the existing baby carriage frame, the two rear wheels are respectively located outside the two front wheels, and it is difficult to reduce the width after folding. Space problem with volume. On the other hand, during the folding of the stroller frame, the seat support mechanism can be pulled directly by the support plate by the linkage shaft located in the frame body under the first joint assembly on the left and right sides. The seat cushion support mechanism automatically folds.

1‧‧‧ frame body

2‧‧‧front wheel set

3‧‧‧Cushion support mechanism

4‧‧‧ Rear wheel folding mechanism

10‧‧‧ front wheel frame

101‧‧‧Front rod

102‧‧‧Front wheel lever

11‧‧‧Cushion support

111‧‧‧ seat cushion

12A‧‧‧First Joint Assembly

12B‧‧‧Second joint assembly

121‧‧‧ linkage shaft

13‧‧‧Side slant

14‧‧‧Hands

141‧‧‧Handlebar

142‧‧‧ Rod

15‧‧‧Operating components

16‧‧‧First crossbar

17‧‧‧Second crossbar

18‧‧‧ Telescopic support rod set

181‧‧‧First support rod

1811‧‧‧Curved long holes

182‧‧‧second support rod

1821‧‧‧Limited blocks

20‧‧‧ front wheel seat

21‧‧‧ front wheel

31‧‧‧First curved plate

311‧‧‧Limited stop

32‧‧‧Second curved plate

33‧‧‧Support board

34‧‧‧ pivot

40‧‧‧ rear wheel frame

41‧‧‧ Rear wheel

42‧‧‧ rear wheel seat

43‧‧‧ Wheels

44‧‧‧Connecting seat

441‧‧‧ pivotal

442‧‧‧Fixed Department

443‧‧‧stop

45‧‧‧Flexible strip

50‧‧‧ linkage group

51‧‧‧first connecting rod

52‧‧‧Second link

53‧‧‧First multi-directional connector

54‧‧‧Second multidirectional connector

60‧‧‧ wheel locking device

61‧‧‧ pedal

62‧‧‧Steel cable

1 is a front perspective view of a preferred embodiment of the present baby carriage frame.

2 is a rear perspective view of the preferred embodiment of the stroller frame of FIG. 1.

3 is a side plan view of a preferred embodiment of the stroller frame of FIG. 1.

4 is a partial bottom perspective view of the preferred embodiment of the stroller frame of FIG. 1.

Figure 5 is a bottom plan view of the preferred embodiment of the stroller frame of Figure 1.

Figure 6 is a partially enlarged perspective view showing the preferred embodiment of the stroller frame of Figure 1.

Figure 7 is a partial bottom plan view of the preferred embodiment of the stroller frame of Figure 1.

Figure 8 is a side plan view showing the preferred embodiment of the stroller frame of Figure 1 in a folded state.

FIG. 9 is a perspective view showing the preferred embodiment of the stroller frame of FIG. 1 in a folded state.

Figure 10 is a schematic plan view showing the preferred embodiment of the stroller frame of Figure 1 in a folded state.

As shown in FIG. 1 to FIG. 3 and FIG. 5, a preferred embodiment of the baby stroller frame of the present invention is disclosed. The stroller frame includes a frame body 1, two front wheel sets 2, and a pad support mechanism. 3 and a rear wheel folding mechanism 4.

As shown in FIG. 1 to FIG. 5, the frame body 1 includes a front wheel frame 10, a pad support frame 11, two first joint assemblies 12A, two side slant rods 13, two second joint assemblies 12B, and a mat. a plate 111, a handle 14, a first crossbar 16, a second crossbar 17, and a linkage shaft 121, the front wheel frame 10 includes two front and rear poles 101 that are opposite to each other and extend obliquely to the rear and upward, and the front wheel Each of the left and right sides of the front end of the frame 10 has a front wheel frame bar 102, and the seat pad support frame 11 is combined with the two first joint assemblies 12A on the left and right front frame bars 101 of the front wheel frame 10, and the two side diagonal bars 13 The two second joint assemblies 12A are respectively disposed on the two first joint assemblies 12A, and the two second joint assemblies 12B are respectively disposed on the upper ends of the two side diagonal rods 13. The seat pad 111 is disposed on the seat cushion support frame 11. The handle 14 includes a handle rail 141 and two rod portions 142 respectively bent downward from the left and right ends of the handle rail 141. The second portion 142 is connected to the second joint assembly 12B, and an operating component 15 is disposed in the handle rail 141 to control the first joint assembly 12A and the second joint assembly 12B.

In the frame body 1, the first joint assembly 12A and the second joint assembly 12B have a clutch control and rotation function, and are subjected to the operation assembly 15 to enable the frame body 1 to be folded and folded. And deployment positioning, the first joint assembly 12A, the second joint assembly 12B, and the operating assembly 15 is not a creative part of the present invention, and various known retractable joint assemblies are available, and the detailed construction thereof will not be described herein.

In the frame body 1 , as shown in FIG. 1 to FIG. 5 , the first cross bar 16 and the second cross bar 17 are disposed under the seat cushion support frame 11 , wherein the first cross bar 16 is horizontally connected. Between the two first joint assemblies 12A. The second crossbar 17 is disposed in parallel on the front lower side of the first crossbar 16, and the second crossbar 17 is coupled between the left and right front masts 101 of the front frame 10. The interlocking shaft 121 is disposed below the bottom surface of the rear portion of the seat cushion 111 and is coupled between the two first joint assemblies 12A to be interlocked with the first joint assembly 12A.

As shown in FIG. 1 , FIG. 3 , FIG. 4 and FIG. 5 , the frame body 1 can also be connected with a telescopic support rod group 18 between the side slanting bars 13 on the left and right sides and the seat cushion support frame 11 . The telescopic support rod set 18 includes a first support rod 181 and a second support rod 182. The first support rod 181 and the second support rod 182 are curved rod members, and the first support rod 181 is pivotally connected to the side oblique rod. 13. The first support rod 181 has a curved long hole 1811 on one side thereof, one end of the second support rod 182 is pivotally connected to the side of the seat cushion support frame 11, and the other end of the second support rod 182 is movably connected to the first support rod. The other end of the second support rod 182 has a limiting block 1821. The limiting block 1821 is located in the curved elongated hole 1811, by limiting the first support rod 181 and the second support rod 182 to be relatively telescopic. Length range.

As shown in FIG. 1 , FIG. 3 , FIG. 4 and FIG. 5 , the two front wheel sets 2 are respectively pivotally disposed on the left and right sides of the front end of the front wheel frame 10 , and the two front wheel sets 2 each include a front wheel base 20 and a front wheel. The front wheel 21 of the seat 20 is pivotally disposed at the bottom end of the front wheel frame 102 and can be rotated to change direction.

As shown in FIG. 1 , FIG. 3 , FIG. 4 and FIG. 5 , the seat cushion supporting mechanism 3 is movably assembled in the frame body 1 , and the seat cushion supporting mechanism 3 is connected to the bottom of the seat cushion 111 . Between the first crossbar 16 and the second crossbar 17, the cushion supporting mechanism 3 includes a first curved plate 31, a second curved plate 32, and a supporting plate 33. The first curved plate 31 is at the top end. The bottom end of the bottom surface of the second curved plate 32 is pivotally connected to the second cross bar 17, and the top end of the support plate 33 is connected to the connecting shaft 121, the first arc The lower end of the shape plate 31, the top end of the second curved plate 32, and the bottom end of the support plate 33 are coaxially pivoted by a pivot post 34. The bottom end portion of the first curved plate 31 has a limit stop portion 311. The limiting portion 311 of the first curved plate 31 is located below the pivot post 34 and outside the top end of the second curved plate 32 to form a multi-point support mechanism capable of unfolding and collapsing.

As shown in FIG. 2, FIG. 3, FIG. 5 and FIG. 6, the rear wheel folding mechanism 4 is disposed on the rear side of the frame body 1 and is opposite to the front left and right sides of the front end of the frame body 1. At the rear of 21, the rear wheel folding mechanism 4 includes two rear wheel frame sets 40 and two link sets 50.

As shown in FIG. 2, FIG. 3, FIG. 5 and FIG. 6, the two rear wheel frame sets 40 are movable on the rear side of the frame body 1. The rear wheel frame sets 40 each include a rear wheel 41. a rear wheel base 42, a wheel bar 43 and a connecting seat 44. The rear wheel 41 has an axle. The rear wheel 41 is pivotally disposed on the side of the rear wheel base 42. The wheel bar 43 is fixed to the rear wheel base. The top line of the wheel bar 43 has an angle with respect to the center line of the axle of the rear wheel 41. The angle is an acute angle. The connecting seat 44 is pivotally connected to the upper end of the wheel bar 43 and is obliquely fixed to the frame. The first cross member 16 of the main body 1 includes a pivoting portion 441 , a fixing portion 442 , and a stopping portion 443 . The connecting portion 44 is fixed to the frame body 1 by the fixing portion 442 . On the first crossbar 16, the pivoting portion 441 of the connecting seat 44 pivotally connects the upper end of the wheel bar 43 with a pivot post. The stopping portion 443 is located behind the upper end of the wheel bar 43 and can limit the connection of the wheel bar 43 with respect to the connection. The angle at which the seat 44 rotates rearward. The connecting seats 44 of the two rear wheel frame sets 40 are inclined from the top to the bottom (referring to the left and right outer sides) and are located between the two second joint assemblies 12B of the frame body 1 and are disposed obliquely. The connecting seat 44 is formed such that the two-wheeled rod 43 is inclined and gradually symmetrical from the upper end toward the rear end. When the two rear wheel frame sets 40 are in the unfolded state, the wheel bars 43 of the two rear wheel frame sets 40 extend from the upper end toward the lower end of the rear end and the spacing increases, that is, the spacing between the upper ends of the second wheel bars 43 is smaller than the The spacing between the lower ends of the second wheel bars 43 and the spacing between the two rear wheels 41 is greater than the spacing between the two front wheels 21. When the two rear wheel frame sets 40 are in the folded state, the spacing between the two rear wheels 41 is smaller than the spacing between the two front wheels 21, and the two rear wheels 41 can be located between the two front wheels 21.

As shown in FIG. 2, FIG. 3, FIG. 5 and FIG. 6, the two rear wheel frame sets 40 can also be connected with a flexible strip 45 between the middle sections of the second wheel rods 43. The second wheel rods 43 are restrained by the flexible strips. The range after stretching. A wheel locking device 60 may be further disposed in the wheel housing 42 of the rear wheel carrier assembly 40. A flexible cable 62 may be connected between the two wheel locking devices 60, and a wheel locking device 60 is disposed on one of the wheel locking devices 60. The pedal 61 controls the wheel lock device 60 by the pedal 61, and the wheel lock devices 60 respectively disposed in the two rear wheel seats 42 are interlocked by the wire rope 62. The wheel locking device is not a creative part of the present invention, and various known wheel locking devices can be used, and the detailed configuration thereof will not be described herein.

As shown in FIG. 2, FIG. 3, FIG. 5 and FIG. 6, the two link sets 50 are respectively disposed at the ends of the second cross bar 17 of the frame body and located on the wheel bars of the two rear wheel frame sets 40. 43 is connected to the corresponding wheel bar 43 . The link set 50 includes a first link 51 , a second link 52 , a first multidirectional connector 53 and a second multidirectional connector 54 . One end of the first connecting rod 51 is connected to the second cross bar 17, and the other end of the first connecting rod 51 is connected to one end of the second connecting rod 52 by a first multidirectional connecting member 53. The second connecting rod 52 The other end is coupled with the second multidirectional connector 54 to connect the middle portion of the wheel bar 43 by the first multidirectional connector 53 connected between the first link 51 and the second link 52 and to the second link. The second multi-directional link 54 between the 52 and the wheel bar 43 enables the two rear wheel frame sets 40 to be deployed rearwardly relative to the frame body 1, folded forward, and left and right relatively unfolded and merged.

With regard to the use case of the novel baby carriage frame, as shown in FIG. 1 to FIG. 3, when the stroller frame is deployed, the left and right side slanting bars 13 of the frame body 1 are respectively directed by the first joint assembly 12A. Upwardly extending, the handle 14 is extended upward by the second joint assembly 12B, and the left and right telescopic support rod groups 18 are also respectively formed in an extended state, and the seat cushion support 11 provides a stable supporting force to the seat cushion 111. The frame body 1 is formed in a smooth unfolded state.

As shown in FIG. 1 to FIG. 6 , on the other hand, the rear wheel folding mechanism 4 is located at the rear side of the frame body 1 , and the two rear wheel frame groups 40 of the rear wheel folding mechanism 4 are extended rearward. The wheel post 43 is guided to the rear outer side by the connecting seat 44 inclined to the outside by the two rear wheel frame group 40, thereby making the second rear The spacing between the wheels 41 is greater than the spacing between the two front wheels 21, while the link set 50 is coupled between the ends of the second crossbar 17 and the middle of the wheel bars 43 of the two rear wheel sets 40, respectively. In the extended state, the supporting force is provided to the rearwardly extending wheel bar 43, and each rear wheel frame group 40 abuts against the upper limit of the wheel bar 43 and supports with the stopping portion 443 of the rear side of the lower end of the connecting seat 44. In addition, the stroller frame further utilizes the foldable seat cushion support mechanism 3 in the frame body 1 to be coupled to the lower portion of the seat cushion 111, the linkage shaft 121, the first crossbar 16 and the second cross. The rods 17 and the limiting portion 311 at the bottom end of the first curved plate 31 are located at the top end stop of the second curved plate 32, and form a multi-point support mechanism capable of unfolding and folding. The pad 111 provides a stable auxiliary support force. Thereby, the rear wheel folding mechanism 4 is deployed in a stable stretch state on the stroller frame, so that the stroller frame can be smoothly moved on the ground.

As shown in FIGS. 8-10, when the stroller frame is folded, the first joint assembly 12A and the second joint assembly 12B are switched to a collapsible state by the operating assembly 15 on the handle 14. And the two first side joints 12A are used to bend the two side slanting rods 13 of the frame body 1 forwardly to merge with the two front frame rods 101 of the front wheel frame 10, and by the two second joint assemblies 12B. The handle 14 is reversely bent to merge with the two side slanting rods 13. During the folding of the frame body 1, the seat cushion supporting mechanism 3 can be on the left and right sides by the linkage shaft 121 located in the frame body 1. The first joint assembly 12A drives the entire cushion support mechanism 3 to be automatically folded by the support plate 33, and the first curved plate 31, the second curved plate 32 and the support plate 33 of the cushion support mechanism 3 are brought up. The shape of the frame body 1 is folded.

On the other hand, the rear wheel folding mechanism 4 is folded by the two link groups 50, and the wheel bars 43 of the two rear wheel frame sets 40 are driven to connect the pivots of the pivoting portions 441 of the seats 44. The column is merged with the center of rotation toward the front front wheel frame 10, and the first multi-directional connecting member 53 connected between the first link 51 and the second link 52 and the second connecting rod 50 are connected. The second multi-directional connecting member 54 between the two connecting rods 52 and the wheel bar 43 causes the two rear wheel frame sets 40 to be folded forward, and simultaneously guides the left and right second wheel bars 43 to be oppositely merged in the middle direction. Further, the left and right rear wheels 41 are engaged between the two front wheels 21, so that the baby carriage frame can be folded down, and the overall width and volume can be greatly reduced.

1‧‧‧ frame body

2‧‧‧front wheel set

3‧‧‧Cushion support mechanism

4‧‧‧ Rear wheel folding mechanism

10‧‧‧ front wheel frame

101‧‧‧Front rod

102‧‧‧Front wheel lever

11‧‧‧Cushion support

12A‧‧‧First Joint Assembly

12B‧‧‧Second joint assembly

13‧‧‧Side slant

14‧‧‧Hands

141‧‧‧Handlebar

142‧‧‧ Rod

18‧‧‧ Telescopic support rod set

181‧‧‧First support rod

1811‧‧‧Curved long holes

182‧‧‧second support rod

1821‧‧‧Limited blocks

20‧‧‧ front wheel seat

21‧‧‧ front wheel

31‧‧‧First curved plate

311‧‧‧Limited stop

32‧‧‧Second curved plate

33‧‧‧Support board

34‧‧‧ pivot

40‧‧‧ rear wheel frame

41‧‧‧ Rear wheel

42‧‧‧ rear wheel seat

43‧‧‧ Wheels

44‧‧‧Connecting seat

50‧‧‧ linkage group

51‧‧‧first connecting rod

52‧‧‧Second link

Claims (6)

A baby carriage frame comprising: a frame body comprising a front wheel frame, a pad support frame, two first joint components, a pad, two side slant bars, two second joint components, a handle, a first crossbar, a second crossbar and a linkage shaft, the front wheel frame includes two front frame rods which are opposite to each other and extend obliquely to the rearward and upward direction, and the seat cushion support frame is combined with the two first joint components On the left and right front frame rods of the front wheel frame, the seat cushion plate is disposed on the seat cushion support frame, and the two side diagonal bars are respectively disposed on the two first joint components, and the two second joint components are respectively grouped An upper end of the two side slanting rods is disposed, the handle comprises a handle crossbar having an operating component, and two shanks extending downward from the left and right ends of the handle rail respectively, the two shanks respectively connecting the second joints An assembly, the operating component of the handle rail can control the first joint assembly and the second joint assembly, the first rail and the second rail are disposed under the seat cushion, and the second cross The rods are arranged in parallel on the front lower side of the first crossbar, the first The rod is laterally connected between the two first joint assemblies, and the second cross rod is connected between the left and right front frame rods of the front wheel frame, and the linkage shaft rod is disposed under the bottom surface of the rear portion of the seat cushion plate, and is connected The first front wheel assembly is interlocked with the first joint assembly; the two front wheel sets are respectively pivoted on the left and right sides of the front end of the frame body, the front wheel set includes a front wheel base and a pivot wheel front seat a front wheel, and the front wheel frame is pivotally disposed on the front wheel frame of the frame body; a pad support mechanism is movably disposed under the seat pad of the frame body, the seat cushion support mechanism includes a first curved plate, a second curved plate and a supporting plate, wherein the top end of the first curved plate is pivotally connected to a middle portion of the bottom surface of the seat plate, and the bottom end of the second curved plate is pivotally connected to the second horizontal portion a rod, the top end of the support plate is connected to the linkage shaft, the bottom end of the first curved plate, the top end of the second curved plate and the bottom end of the support plate are coaxially pivotally connected; A rear wheel folding mechanism is disposed on a rear side of the frame body, and the rear wheel folding mechanism comprises two rear wheel frame groups and two link groups, wherein: the two rear wheel frame groups can be actively assembled On the first crossbar of the frame body, the rear wheel carrier set includes a rear wheel, a rear wheel base, a wheel bar and a connecting base, the rear wheel has an axle, and the axle is pivoted on the axle a side of the rear wheel base, the wheel rod is fixed to the top of the rear wheel base, the center line of the wheel rod has an acute angle with respect to the center line of the axle of the rear wheel, and the connecting seat is pivotally connected to the upper end of the wheel rod And the connecting seat includes a pivoting portion and a fixing portion and a stopping portion respectively located at an upper end of the pivoting portion, and the connecting seat is fixed to the fixing portion by the fixing portion The pivoting portion of the connecting seat pivotally connects the upper end of the wheel rod with a pivot post, the stopping portion is located behind the upper end portion of the wheel rod, and can limit the rearward rotation of the wheel rod relative to the connecting seat. Angle, the connecting seat of the two rear wheel frame sets is inclined from the top to the bottom, and the second wheel bar is made by the obliquely disposed connecting seat The two rear wheel carriers are assembled in an unfolded state from above the front end toward the rear end, and the two rear wheel frames are disposed in an unfolded state, and the spacing between the two rear wheels is greater than the spacing between the two front wheels at the front, and the two The rear wheel frame group is in a folded state, and the two rear wheel wheels are disposed at a position between the two front wheels; the two link groups are respectively disposed at two ends of the second cross bar of the frame body, and are located at the same The wheel bars of the two rear wheel frame sets are connected to the corresponding wheel bars, and the link sets each include a first link, a second link, a first multidirectional connector and a second multidirectional connection. One end of the first link is connected to the second cross bar, and the other end of the first link is coupled to one end of the second link in combination with the first multi-directional connector, and the other end of the second link is coupled The two multi-directional connectors are connected to the middle section of the wheel bar. The stroller frame of claim 1, wherein the bottom end portion of the first curved plate has a limit stop portion, the limit stop portion is located below the pivot post and opposite to the second curved plate The top side of the top. The stroller frame of claim 2, wherein a telescopic support rod group is connected between the side slanting rods on the left and right sides of the frame body and the seat cushion support frame, and the telescopic support rod group includes a first a support rod and a second support rod, the first support rod and the second support rod being curved rod members, One end of the first support rod is pivotally connected to the side slanting rod, and a side of the first support rod has an arcuate long hole, and one end of the second support rod is pivotally connected to the side of the seat cushion support frame, and the second support The other end of the rod is movably connected to the other end of the first support rod, and the other end of the second support rod has a limiting block, and the limiting block is located in the curved long hole to limit the first A length range in which the support rod and the second support rod are relatively telescopic. The stroller frame of claim 3, wherein the front wheel frame has a front wheel frame on each of the left and right sides of the front wheel frame, and the front wheel bases of the two front wheel sets are respectively pivoted at the bottom of the front end of the front wheel frame. The stroller frame of any one of claims 1 to 4, wherein the two rear wheel sets are coupled to a flexible strip between the middle sections of the second wheel. The stroller frame of claim 5, wherein the wheel bases of the two rear wheel sets are each provided with a wheel locking device capable of selectively locking the wheels, and a cable is connected between the two wheel locking devices to be linked. One of the two wheel locking devices has a pedal that can control the wheel locking device.