Baby carriage frame

Abstract

The baby carriage frame comprises a frame connecting piece, a front foot rod, a rear foot rod and a push rod, the front foot rod, the rear foot rod and the push rod are correspondingly and rotatably connected with the frame connecting piece, the lower end of the front foot rod is connected with a front wheel set, and the lower end of the rear foot rod is connected with a rear wheel set. When the baby carriage frame is unfolded, the distance between the two rear wheel sets is larger than that between the two front wheel sets, and the baby carriage frame further comprises a frame locking and unlocking mechanism and frame linkage assemblies arranged among the frame connecting pieces, the front foot rods, the rear foot rods and the push rods. The frame linkage assembly is configured to cooperatively link the front foot rods to be folded towards the rear foot rods in the process that the push rods are folded towards the rear foot rods, and link the lower ends of the two rear foot rods to be folded oppositely, so that the distance between the two rear wheel sets is smaller than that between the two front wheel sets, the overall structure of the folded baby carriage frame is more compact, the size is minimized, and the baby carriage frame is more convenient to assemble and disassemble. And carrying, packaging and transportation are convenient.

Description

[Technical field]

[0001] The invention relates to the technical field of baby carriages, in particular to a baby carriage frame. [Background technology]

[0002] When parents take their infants and young children out, they usually bring a stroller. Traditional strollers are large in size and still very large after folding, so there is a problem of inconvenience in carrying them when traveling. In addition, with the improvement of living standards, people have higher and higher requirements for travel convenience. Therefore, the operability of the stroller when folded and the size of the stroller after folding have become the focus of consumers. More specifically, with regard to foldable strollers, the better the linkage of the components of the stroller, the easier the folding and unfolding operations will be, and vice versa, the more laborious it will be to operate. As for the size of the stroller after folding, in order to meet the needs of carrying it when riding in a car or on an airplane, of course, it is hoped that the stroller will be as small as possible after folding; even when it is not in use and stored at home, the smaller the folded volume is, the less space it will take up.

[0003] However, most of the existing baby strollers still have the following defects:

[0004] 1. It cannot be fully folded. After folding, the stroller still occupies a large volume, which is not conducive to carrying and transporting.

[0005] 2. Complex structure and high production cost.

[0006] 3. The user is required to fold several groups of components separately, such as secondary folding, which is time-consuming and laborious.

[0007] 4. In the existing stroller frame, whether before or after folding, the distance between the two front leg rods is smaller than the distance between the two rear leg rods. After this type of stroller is folded, the two front leg rods are folded between the two rear leg rods or located in front of the two rear leg rods. The distance between the two rear leg rods determines the width size after folding. This type of stroller still has the defect of not being compact enough after folding, which also makes the packaging cost high.

[0008] Therefore, the present invention is studied and proposed in view of the above problems. [Summary of the invention]

[0009] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a baby carriage frame, which, through a frame linkage assembly, can cooperatively link the front foot rod to move toward and fold the rear foot rod during the process of the push rod moving toward and folding the rear foot rod, and link the lower ends of the two rear foot rods to fold toward each other so that the distance between the two rear wheel groups is smaller than the distance between the two front wheel groups, which is conducive to making the overall structure of the baby carriage frame more compact after folding, minimizing the volume, and facilitating carrying and packaging for transportation.

[0010] The present invention provides a baby carriage frame, which can be switched between an unfolded use state and a folded use state, comprising a frame connecting member 1, a front foot rod 2, a rear foot rod 3 and a push rod 4, wherein the front foot rod 2, the rear foot rod 3 and the push rod 4 are rotatably connected to the frame connecting member 1 respectively, the lower end of the front foot rod 2 is connected to a front wheel group 20, and the lower end of the rear foot rod 3 is connected to a rear wheel group 30, and when the baby carriage frame is unfolded, the distance between the two rear wheel groups is greater than the distance between the two front wheel groups, the baby carriage frame also includes a frame locking and unlocking mechanism 6 and a frame linkage assembly 5 arranged between the frame connecting member 1, the front foot rod 2, the rear foot rod 3 and the push rod 4, the frame linkage assembly 5 is configured to cooperatively link the front foot rod 2 to move toward and fold the rear foot rod 3 in the process of the push rod 4 moving toward and folding the rear foot rod 3, and to link the lower ends of the two rear foot rods 3 to fold toward each other so that the distance between the two rear wheel groups is smaller than the distance between the two front wheel groups.

[0011] In the above-mentioned baby carriage frame, the upper end of the front foot rod 2 is rotatably connected to the frame connecting member 1 around the pivot axis A; the upper end of the rear foot rod 3 is rotatably connected to the frame connecting member 1 around the pivot axis B perpendicular to the pivot axis A; the lower end of the push rod 4 is rotatably connected to the frame connecting member 1 around the pivot axis C parallel to or coaxial with the pivot axis A; the frame linkage assembly 5 links the two rear foot rods 3 to fold toward each other and place the two rear wheel groups between the inner sides of the two front wheel groups.

[0012] As described above, the baby carriage frame also includes a seat portion 7 movably connected to the frame connector 1, and the frame linkage assembly 5 is linked to the seat portion 7. The frame linkage assembly 5 is configured to cooperatively link the seat portion 7 to be folded accordingly when the push rod 4 moves toward the rear leg rod 3 and is folded.

[0013] In the above-mentioned baby carriage frame, the side of the seat portion 7 is rotatably and slidably connected to the frame connecting member 1, and the frame linkage assembly 5 is configured to link the seat portion 7 to slide backward and flip and fold when the push rod 4 moves toward the rear leg rod 3 and folds, so that the front portion of the seat portion 7 does not protrude from the upper surface of the frame connecting member 1.

[0014] As described above, in a baby carriage frame, the frame linkage assembly 5 includes a first linkage assembly 51 and a second linkage assembly 52; the first linkage assembly 51 is located between the rear foot rod 3, the push rod 4 and the seat portion 7, and the first linkage assembly 51 is configured to be used to link the seat portion 7 to be folded accordingly when the push rod 4 is folded toward the rear foot rod 3; the second linkage assembly 52 is located between the front foot rod 2, the rear foot rod 3 and the first linkage assembly 51, and the second linkage assembly 52 is configured to be linked by the first linkage assembly 51 accordingly when the push rod 4 is folded toward the rear foot rod 3, thereby linking the front foot rod 2 to be folded toward the rear foot rod 3 and linking the lower ends of the two rear foot rods 3 to be folded toward each other.

[0015] As described above, in a baby carriage frame, the frame locking and unlocking mechanism 6 includes a first locking mechanism 61, a second locking mechanism 62 and an unlocking mechanism 63; the first locking mechanism 61 is located on the push rod 4 and is used to lock the first linkage assembly 51; the unlocking mechanism 63 is located on the push rod 4 and is used to link the unlocking action of the first locking mechanism 61; the second locking mechanism 62 is located between the frame connecting member 1 and the second linkage assembly 52 and is used to lock the second linkage assembly 52, and the second locking mechanism 62 is configured to be correspondingly unlocked by the push rod 4 during the process of the push rod 4 moving toward and folding the rear leg rod 3.

[0016] In the above-mentioned baby carriage frame, the push rod 4 includes a lower push rod 41 and a handlebar 42, the lower end of the lower push rod 41 is rotatably connected to the frame connecting member 1 around the pivot axis C, and the lower part of the handlebar 42 is rotatably connected to the upper end of the lower push rod 41; the side of the seat part 7 is rotatably and slidably connected to the frame connecting member 1, and the rear part of the seat part 7 is directly or indirectly connected to the first linkage assembly 51 and the second linkage assembly 52 respectively.

[0017] As described above, in a baby carriage frame, the first linkage assembly 51 includes a first driving rod 511, a first support rod 512 and a first linkage rod 513, the upper end of the first driving rod 511 is rotatably connected to the lower end of the handlebar rod 42, the lower end of the first driving rod 511 is rotatably connected to the lower end of the first support rod 512 and the rear end of the seat portion 7, the upper end of the first support rod 512 is rotatably connected to the lower part of the lower push rod 41, the upper end of the first linkage rod 513 is rotatably connected to the lower end of the first driving rod 511 directly or indirectly, and the lower end of the first linkage rod 513 is rotatably connected to the second linkage assembly 52.

[0018] In the above-mentioned baby carriage frame, the first locking mechanism 61 is located between the lower push rod 41 and the handlebar 42 for locking the handlebar 42 relative to the lower push rod 41 , and the unlocking mechanism 63 is located on the handlebar 42 .

[0019] As described above, in a baby carriage frame, the second linkage assembly 52 includes a second connecting seat 521, a second linkage front rod 522 and a second linkage rear rod 523, the rear portion of the second connecting seat 521 is rotatably connected to the first linkage assembly 51, the front end of the second linkage front rod 522 is rotatably connected to the front foot rod 2, the rear end of the second linkage front rod 522 is rotatably connected to the front portion of the second connecting seat 521, one end of the second linkage rear rod 523 is rotatably connected to the rear foot rod 3, and the other end of the second linkage rear rod 523 is rotatably connected to the side portion of the second connecting seat 521; the second locking mechanism 62 is located between the second connecting seat 521 and the frame connector 1.

[0020] In the above-mentioned baby carriage frame, the two frame connecting parts 1 are connected by a frame cross bar 11; the second locking mechanism 62 includes a static locking portion 624 arranged on the frame cross bar 11 and a dynamic locking portion 625 arranged on the second linkage assembly 52, the dynamic locking portion 625 and the static locking portion 624 can be locked and connected with each other, and the static locking portion 624 is configured to be separated from the dynamic locking portion 625 by a releasing force during the process of the push rod 4 approaching and folding toward the rear leg rod 3, and the dynamic locking portion 625 moves toward the lower end of the rear leg rod 3 under the traction of the second linkage assembly 52.

[0021] As described above, in a baby carriage frame, the second linkage assembly 52 includes a second connecting seat 521 and a second linkage rear rod 523, the rear portion of the second connecting seat 521 is rotatably connected to the first linkage assembly 51, one end of the second linkage rear rod 523 is rotatably connected to the rear foot rod 3, and the other end of the second linkage rear rod 523 is rotatably connected to the side portion of the second connecting seat 521; the dynamic locking portion 625 is provided with a second locking hook 621, the static locking portion 624 is provided with a locking bayonet 6241, and the side of the locking bayonet 6241 is provided with a second locking block 622 for locking the second locking hook 621 inserted into the locking bayonet 6241, and the second locking block 622 is configured to be linked and released during the process of the push rod 4 moving toward and folding the rear foot rod 3.

[0022] The baby carriage frame as described above further includes a handrail 8 , which is connected to the first linkage assembly 51 and is configured to be folded in a coordinated manner when the push rod 4 is folded toward the rear leg rod 3 .

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. In the folding process of the present invention, it is only necessary to operate the frame locking and unlocking mechanism to release the lock of the baby carriage frame, and then make the push rod move closer to the rear foot rod and fold it. In the above push rod folding process, the push rod cooperates with the frame linkage assembly to link the front foot rod to move closer to the rear foot rod and link the lower ends of the two rear foot rods to fold towards each other, so that the distance between the two rear wheel groups is smaller than the distance between the two front wheel groups, which is conducive to making the overall structure of the baby carriage frame more compact after folding, minimizing the volume, and making it convenient to carry and transport, and easy to use.

[0025] 2. In order to further make the overall structure of the baby stroller frame more compact after being folded, the two rear wheel groups are placed between the inner sides of the two front wheel groups after the baby stroller frame is folded, so it is helpful to reduce the thickness of the packaging box.

[0026] 3. In order to facilitate the unlocking operation, the present invention only needs to manually operate the unlocking mechanism to release the locked state of the first locking mechanism, and then the second locking mechanism can be linked to unlock.

[0027] 4. The lower push rod, the handlebar, the first driving rod and the first support rod are connected to form a four-bar linkage. The lower push rod, the frame connecting piece, the seat part and the first support rod are connected to form a four-bar linkage. The first support rod is used as the common side of the two four-bar linkages. Therefore, by controlling the locking and unlocking of the four-bar linkage where the handlebar is located, the other four-bar linkage can be locked and unlocked accordingly. It has the characteristics of reasonable structural design and smooth linkage.

[0028] 5. The frame linkage assembly links the seat portion to slide backward and flip and fold when the push rod moves toward the rear foot rod to make the front of the seat portion not protrude from the upper surface of the frame connector, which is beneficial to make the height direction of the baby carriage frame more compact after folding and to reduce the height dimension of the packaging box.

Brief Description of the Drawings

[0029] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is one of the three-dimensional structural schematic diagrams of the present invention when it is in an unfolded use state.

[0031] Figure 2 This is the second schematic diagram of the three-dimensional structure of the present invention when it is in an unfolded use state.

[0032] Figure 3 This is the third schematic diagram of the three-dimensional structure of the present invention when it is in an unfolded use state.

[0033] Figure 4 It is a side view structural schematic diagram of the present invention when it is in an unfolded use state.

[0034] Figure 5 It is one of the three-dimensional structural schematic diagrams of the present invention during the folding process.

[0035] Figure 6 This is the second schematic diagram of the three-dimensional structure of the present invention during the folding process.

[0036] Figure 7 It is a side view schematic diagram of the structure of the present invention during the folding process.

[0037] Figure 8 It is a side view schematic diagram of the structure of the present invention when it is in a folded use state.

[0038] Fig. 9 It is a cross-sectional structural schematic diagram of the present invention.

[0039] Fig.10 This is one of the explosion structure schematic diagrams of the present invention.

[0040] Fig.11 This is the second schematic diagram of the explosion structure of the present invention.

[0041] Fig.12 This is the third schematic diagram of the explosion structure of the present invention.

[0042] Fig.13 This is the fourth schematic diagram of the explosion structure of the present invention. [Specific implementation method]

[0043] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] like Figure 1-13 As shown, the present invention provides a baby carriage frame, which can be switched between an unfolded use state and a folded use state, comprises a frame connecting member 1, a front foot rod 2, a rear foot rod 3 and a push rod 4, wherein the front foot rod 2, the rear foot rod 3 and the push rod 4 are rotatably connected to the frame connecting member 1 respectively, the lower end of the front foot rod 2 is connected to a front wheel group 20, the lower end of the rear foot rod 3 is connected to a rear wheel group 30, when the baby carriage frame is unfolded, the distance between the two rear wheel groups is greater than the distance between the two front wheel groups, the baby carriage frame also comprises a frame locking and unlocking mechanism 6 and a frame linkage assembly 5 arranged between the frame connecting member 1, the front foot rod 2, the rear foot rod 3 and the push rod 4, the frame linkage assembly 5 is configured to cooperatively link the front foot rod 2 to move toward and fold the rear foot rod 3 in the process of the push rod 4 moving toward and folding the rear foot rod 3, and to link the lower ends of the two rear foot rods 3 to fold toward each other so that the distance between the two rear wheel groups is smaller than the distance between the two front wheel groups. During the folding process of the present invention, it is only necessary to operate the frame locking and unlocking mechanism to release the lock of the baby carriage frame, and then make the push rod move closer to the rear foot rod and fold it. During the above push rod folding process, the push rod cooperatively links the front foot rod to move closer to the rear foot rod and folds it through the frame linkage assembly, and links the lower ends of the two rear foot rods to fold towards each other, so that the distance between the two rear wheel groups is smaller than the distance between the two front wheel groups, which is conducive to making the overall structure of the baby carriage frame more compact after folding, minimizing the volume, and making it convenient to carry and package for transportation. It is easy to use and has a reasonable design.

[0045] like Figure 1-8 As shown, in order to ensure smooth folding and folding in multiple directions, the upper end of the front foot rod 2 is rotatably connected to the frame connecting member 1 around the pivot axis A; the upper end of the rear foot rod 3 is rotatably connected to the frame connecting member 1 around the pivot axis B perpendicular to the pivot axis A; the lower end of the push rod 4 is rotatably connected to the frame connecting member 1 around the pivot axis C parallel to or coaxial with the pivot axis A.

[0046] like Fig.10 As shown, in order to make the overall structure of the baby carriage frame more compact and minimize the volume after folding, the frame linkage assembly 5 links the two rear leg rods 3 to fold toward each other and place the two rear wheel groups between the inner sides of the two front wheel groups, thereby helping to reduce the thickness of the packaging box.

[0047] like Figure 1-8As shown, the baby carriage frame further includes a seat portion 7 movably connected to the frame connector 1, and the frame linkage assembly 5 is movably connected to the seat portion 7, and the frame linkage assembly 5 is configured to cooperatively link the seat portion 7 to correspondingly fold when the push rod 4 is folded toward the rear leg rod 3. In this embodiment, the frame linkage assembly 5 cooperatively links the front leg rod, the seat portion, and the two rear leg rods to correspondingly fold when the push rod 4 is folded toward the rear leg rod 3, thereby realizing the functional feature of one-button folding.

[0048] like Figure 8 As shown, the side of the seat portion 7 is rotatably and slidably connected to the frame connecting member 1, and the frame linkage assembly 5 is configured to link the seat portion 7 to slide backward and flip and fold when the push rod 4 moves toward the rear foot rod 3 and folds, so that the front portion of the seat portion 7 does not protrude from the upper surface of the frame connecting member 1, which is beneficial to making the height direction of the baby carriage frame more compact after folding, and is beneficial to reducing the height size of the packaging box.

[0049] like Figure 1 , 2 As shown, a guide sliding mechanism is provided between the side of the seat portion 7 and the frame connecting member 1, and the guide sliding mechanism includes a guide sliding groove 71 provided on the side of the seat portion 7 and extending along the front-rear direction of the seat portion 7, and a guide pivot 12 provided on the frame connecting member 1 and placed in the guide sliding groove 61. Figure 1 As shown, the rear end of the seat portion 7 is rotatably connected to the lower ends of the first driving rod 511 and the first supporting rod 512 .

[0050] like Figure 1-8 As shown in Figures 11 and 13, in order to facilitate and efficiently carry out the linkage, the frame linkage assembly 5 includes a first linkage assembly 51 and a second linkage assembly 52; the first linkage assembly 51 is located between the rear foot rod 3, the push rod 4 and the seat portion 7, and the first linkage assembly 51 is configured to be used to link the seat portion 7 to be folded accordingly when the push rod 4 is folded toward the rear foot rod 3; the second linkage assembly 52 is located between the front foot rod 2, the rear foot rod 3 and the first linkage assembly 51, and the second linkage assembly 52 is configured to be linked by the first linkage assembly 51 accordingly when the push rod 4 is folded toward the rear foot rod 3, thereby linking the front foot rod 2 to be folded toward the rear foot rod 3 and linking the lower ends of the two rear foot rods 3 to be folded toward each other.

[0051] like Figure 1 , 10As shown in 11, for reliable locking and convenient unlocking, the frame locking and unlocking mechanism 6 includes a first locking mechanism 61, a second locking mechanism 62 and an unlocking mechanism 63; the first locking mechanism 61 is located on the push rod 4 and is used to lock the first linkage assembly 51; the unlocking mechanism 63 is located on the push rod 4 and is used to link the unlocking action of the first locking mechanism 61; the second locking mechanism 62 is located between the frame connecting member 1 and the second linkage assembly 52 and is used to lock the second linkage assembly 52, and the second locking mechanism 62 is configured to be correspondingly unlocked by the push rod 4 when the push rod 4 is folded toward the rear foot rod 3. The structures of the first locking mechanism 61 and the unlocking mechanism 63 in the present invention can adopt the baby carriage frame and baby carriage with application number 201921212228.1, and the locking and unlocking mechanism of a baby carriage with application number 201921479323.8, which will not be described here.

[0052] like Figure 1-8 As shown, in order to make the structure more compact after folding, the push rod 4 includes a lower push rod 41 and a handlebar rod 42, the lower end of the lower push rod 41 is rotatably connected to the frame connecting member 1 around the pivot axis C, and the lower part of the handlebar rod 42 is rotatably connected to the upper end of the lower push rod 41; the side portion of the seat portion 7 is rotatably and slidably connected to the frame connecting member 1, and the rear portion of the seat portion 7 is directly or indirectly connected to the first linkage assembly 51 and the second linkage assembly 52 respectively.

[0053] like Figure 1-8 , 11, and 13, for reliable linkage, the first linkage assembly 51 includes a first driving rod 511, a first support rod 512, and a first linkage rod 513. The upper end of the first driving rod 511 is rotatably connected to the lower end of the handlebar rod 42, the lower end of the first driving rod 511 is rotatably connected to the lower end of the first support rod 512 and the rear end of the seat portion 7, the upper end of the first support rod 512 is rotatably connected to the lower part of the lower push rod 41, and the upper end of the first linkage rod 513 is directly or indirectly connected to the lower end of the first driving rod 511. Rotationally connected, the lower end of the first linkage rod 513 is rotatably connected to the second linkage assembly 52, the lower push rod 41, the handlebar rod 42, the first driving rod 511 and the first support rod 512 are connected to form a four-bar linkage, the lower push rod 41, the frame connecting part 1, the seat part 7 and the first support rod 512 are connected to form a four-bar linkage; the first support rod 512 is the common side of the two four-bar linkages, so when the four-bar linkage where the handlebar rod 42 is located is locked, the folding of the baby carriage frame in the front and rear directions is restricted.

[0054] like Figure 1 , 11As shown in FIG. 13 , the lower end of the first driving rod 511 is rotatably connected to the linkage cross rod 510 , the lower end of the first supporting rod 512 and the upper end of the first linkage rod 513 are relatively fixedly connected to the linkage cross rod 510 , and the rear end of the seat portion 7 is rotatably connected to the linkage cross rod 510 .

[0055] like Figure 1 As shown, in order to facilitate unlocking, the first locking mechanism 61 is located between the lower push rod 41 and the handlebar rod 42 for locking the handlebar rod 42 relative to the lower push rod 41 , and the unlocking mechanism 63 is located on the handlebar rod 42 .

[0056] like Figure 1-8 As shown in Figures 11 and 13, in order to ensure reliable linkage, the second linkage component 52 includes a second connecting seat 521, a second linkage front rod 522 and a second linkage rear rod 523. The rear part of the second connecting seat 521 is rotatably connected to the first linkage component 51, the front end of the second linkage front rod 522 is rotatably connected to the front foot rod 2, the rear end of the second linkage front rod 522 is rotatably connected to the front part of the second connecting seat 521, one end of the second linkage rear rod 523 is rotatably connected to the rear foot rod 3, and the other end of the second linkage rear rod 523 is rotatably connected to the side of the second connecting seat 521; the second locking mechanism 62 is located between the second connecting seat 521 and the frame connector 1.

[0057] like Fig. 9 , 10 As shown, in order to ensure reliable locking, the two frame connecting parts 1 are connected by a frame cross bar 11; the second locking mechanism 62 includes a static locking part 624 arranged on the frame cross bar 11 and a dynamic locking part 625 arranged on the second linkage assembly 52, the dynamic locking part 625 and the static locking part 624 can be mutually locked and connected, and the static locking part 624 is configured to be separated from the dynamic locking part 625 by the release force during the process of the push rod 4 approaching and folding toward the rear foot rod 3, and the dynamic locking part 625 moves toward the lower end of the rear foot rod 3 under the traction of the second linkage assembly 52.

[0058] like Fig. 9 , 10As shown, in order to ensure reliable locking, the second linkage assembly 52 includes a second connecting seat 521 and a second linkage rear rod 523, the rear portion of the second connecting seat 521 is rotatably connected to the first linkage assembly 51, one end of the second linkage rear rod 523 is rotatably connected to the rear foot rod 3, and the other end of the second linkage rear rod 523 is rotatably connected to the side portion of the second connecting seat 521; the dynamic locking portion 625 is arranged on the second connecting seat 521, the dynamic locking portion 625 is provided with a second locking hook 621, the static locking portion 624 is provided with a locking bayonet 6241, and the side of the locking bayonet 6241 is provided with a second locking block 622 for locking the second locking hook 621 inserted into the locking bayonet 6241, the second locking block 622 is configured to be linked and released during the process of the push rod 4 approaching and folding toward the rear foot rod 3, and the static locking portion 624 is provided with a second elastic reset member 623 for driving the second locking block 622 to elastically reset. In this embodiment, an unlocking pull rope is provided between the second locking block 622 and the lower end of the handlebar rod 42 , the lower end of the unlocking pull rope is connected to the second locking block 622 , and the upper end of the unlocking pull rope is connected to the lower end of the handlebar rod 42 .

[0059] In order to facilitate the folding and unfolding, a handrail 8 is also included, and the handrail 8 is connected to the first linkage assembly 51 and is configured to be folded and retracted in a coordinated manner when the push rod 4 moves toward the rear foot rod 3. Figure 1 As shown, the upper end of the first support rod 512 extends upward to form a handrail connecting portion for connecting to the handrail rod 8.

[0060] like Figure 1-8 As shown, when folding, the unlocking mechanism 63 is operated to link the unlocking action of the first locking mechanism 61 to release the locking state of the handlebar 42 relative to the lower push rod 41, and then the handlebar 42 is operated to flip forward relative to the lower push rod 41 and fold toward the side of the lower push rod 41. During the above-mentioned flipping and folding process of the handlebar 42, the handlebar 41 is linked to the unlocking action of the second locking block 622 through the unlocking rope, so that the second locking block 622 is separated from the second locking hook 621 to release the locking state between the static locking part 624 and the dynamic locking part 625, thereby releasing the locking state of the second linkage assembly 52 relative to the frame connecting member 1. The lower push rod 41 is then operated to slide downward toward the side of the rear foot rod 2 and fold. The lower push rod 41 is linked to the seat portion 7 through the first driving rod 511 and the first support rod 512 to slide backward and flip and fold toward the side of the rear foot rod 2. The lower push rod 41 drives the second connecting seat 521 to drive the rear end of the second linkage front rod 522 and one end of the two second linkage rear rods 523 to move downward through the first driving rod 511, the first support rod 512, and the first linkage rod 513, so that the front foot rod 1 flips backward and moves toward the side of the rear foot rod, and the two rear foot rods 2 move toward each other and fold, until the folding operation of the entire baby carriage frame is completed. Figure 8 shown.

Claims

1. A baby carriage frame that can be switched between an unfolded state and a folded state, characterized in that The baby stroller frame comprises a frame connecting member (1), a front foot rod (2), a rear foot rod (3) and a push rod (4); the front foot rod (2), the rear foot rod (3) and the push rod (4) are rotatably connected to the frame connecting member (1) respectively; the lower end of the front foot rod (2) is connected to a front wheel group (20); the lower end of the rear foot rod (3) is connected to a rear wheel group (30); when the baby stroller frame is unfolded, the distance between the two rear wheel groups is greater than the distance between the two front wheel groups; the baby stroller frame also comprises a frame locking and unlocking mechanism (6) and a frame linkage assembly (5) arranged between the frame connecting member (1), the front foot rod (2), the rear foot rod (3) and the push rod (4); the frame linkage assembly (5) is configured to cooperatively link the front foot rod (2) to move toward and fold the rear foot rod (3) during the process of the push rod (4) moving toward and folding the rear foot rod (3), and to link the lower ends of the two rear foot rods (3) to fold toward each other so that the distance between the two rear wheel groups is smaller than the distance between the two front wheel groups.

2. A baby carriage frame according to claim 1, characterized in that The upper end of the front foot rod (2) is rotatably connected to the frame connecting member (1) around a pivot axis A; the upper end of the rear foot rod (3) is rotatably connected to the frame connecting member (1) around a pivot axis B perpendicular to the pivot axis A; the lower end of the push rod (4) is rotatably connected to the frame connecting member (1) around a pivot axis C parallel to or coaxial with the pivot axis A; the frame linkage assembly (5) links the two rear foot rods (3) to fold toward each other and place the two rear wheel groups between the inner sides of the two front wheel groups.

3. A baby carriage frame according to claim 1, characterized in that The baby carriage frame further comprises a seat portion (7) movably connected to the frame connecting member (1); the frame linkage assembly (5) is movably connected to the seat portion (7); and the frame linkage assembly (5) is configured to cooperatively link the seat portion (7) to be folded accordingly when the push rod (4) is folded toward the rear foot rod (3).

4. A baby carriage frame according to claim 3, characterized in that The side of the seat portion (7) is rotatably and slidably connected to the frame connecting member (1), and the frame linkage assembly (5) is configured to link the seat portion (7) to slide backward and flip and fold when the push rod (4) moves toward the rear foot rod (3) and folds, so that the front part of the seat portion (7) does not protrude from the upper surface of the frame connecting member (1).

5. A baby carriage frame according to claim 3, characterized in that The frame linkage assembly (5) comprises a first linkage assembly (51) and a second linkage assembly (52); The first linkage component (51) is located between the rear foot rod (3), the push rod (4) and the seat portion (7), and the first linkage component (51) is configured to link the seat portion (7) to be folded accordingly when the push rod (4) is folded toward the rear foot rod (3); The second linkage assembly (52) is located between the front foot rod (2), the rear foot rod (3) and the first linkage assembly (51). The second linkage assembly (52) is configured to be correspondingly linked by the first linkage assembly (51) during the process of the push rod (4) moving toward and folding the rear foot rod (3), thereby linking the front foot rod (2) to move toward and fold the rear foot rod (3) and linking the lower ends of the two rear foot rods (3) to fold toward each other.

6. A baby carriage frame according to claim 5, characterized in that The frame locking and unlocking mechanism (6) comprises a first locking mechanism (61), a second locking mechanism (62) and an unlocking mechanism (63); The first locking mechanism (61) is located on the push rod (4) and is used to lock the first linkage assembly (51); The unlocking mechanism (63) is located on the push rod (4) and is used to link the unlocking action of the first locking mechanism (61); The second locking mechanism (62) is located between the frame connecting member (1) and the second linkage assembly (52) for locking the second linkage assembly (52), and the second locking mechanism (62) is configured to be unlocked by the push rod (4) in a corresponding linkage process when the push rod (4) is folded toward the rear foot rod (3).

7. A baby carriage frame according to claim 6, characterized in that The push rod (4) comprises a lower push rod (41) and a handlebar (42); the lower end of the lower push rod (41) is rotatably connected to the frame connecting member (1) around a pivot axis C, and the lower part of the handlebar (42) is rotatably connected to the upper end of the lower push rod (41); the side of the seat portion (7) is rotatably and slidably connected to the frame connecting member (1), and the rear part of the seat portion (7) is directly or indirectly connected to the first linkage assembly (51) and the second linkage assembly (52) respectively.

8. A baby carriage frame according to claim 7, characterized in that The first linkage assembly (51) comprises a first driving rod (511), a first supporting rod (512) and a first linkage rod (513); the upper end of the first driving rod (511) is rotatably connected to the lower end of the handlebar (42); the lower end of the first driving rod (511) is rotatably connected to the lower end of the first supporting rod (512) and the rear end of the seat portion (7); the upper end of the first supporting rod (512) is rotatably connected to the lower part of the push rod (41); the upper end of the first linkage rod (513) is directly or indirectly rotatably connected to the lower end of the first driving rod (511); and the lower end of the first linkage rod (513) is rotatably connected to the second linkage assembly (52).

9. A baby carriage frame according to claim 7, characterized in that The first locking mechanism (61) is located between the lower push rod (41) and the handlebar (42) and is used to lock the handlebar (42) relative to the lower push rod (41), and the unlocking mechanism (63) is located on the handlebar (42).

10. A baby carriage frame according to any one of claims 6 to 9, characterized in that The second linkage assembly (52) comprises a second connecting seat (521), a second linkage front rod (522) and a second linkage rear rod (523); the rear portion of the second connecting seat (521) is rotatably connected to the first linkage assembly (51); the front end of the second linkage front rod (522) is rotatably connected to the front foot rod (2); the rear end of the second linkage front rod (522) is rotatably connected to the front portion of the second connecting seat (521); one end of the second linkage rear rod (523) is rotatably connected to the rear foot rod (3); and the other end of the second linkage rear rod (523) is rotatably connected to the side portion of the second connecting seat (521); the second locking mechanism (62) is located between the second connecting seat (521) and the frame connecting member (1).

11. A baby carriage frame according to claim 6, characterized in that The two frame connecting members (1) are connected via a frame cross bar (11); the second locking mechanism (62) comprises a static locking portion (624) arranged on the frame cross bar (11) and a dynamic locking portion (625) arranged on the second linkage assembly (52); the dynamic locking portion (625) and the static locking portion (624) can be mutually locked and connected, and the static locking portion (624) is configured to be separated from the dynamic locking portion (625) by a release force when the push rod (4) is moved toward the rear foot rod (3) and the dynamic locking portion (625) is pulled toward the lower end of the rear foot rod (3) by the second linkage assembly (52).

12. A baby carriage frame according to claim 11, characterized in that The second linkage assembly (52) comprises a second connecting seat (521) and a second linkage rear rod (523), the rear portion of the second connecting seat (521) is rotatably connected to the first linkage assembly (51), one end of the second linkage rear rod (523) is rotatably connected to the rear foot rod (3), and the other end of the second linkage rear rod (523) is rotatably connected to the side portion of the second connecting seat (521); the dynamic locking portion (625) is provided with a second locking hook (621), the static locking portion (624) is provided with a locking bayonet (6241), and the locking bayonet (6241) is provided with a second locking block (622) on the side thereof for locking the second locking hook (621) inserted into the locking bayonet (6241), and the second locking block (622) is configured to be released by linkage when the push rod (4) is moved toward the rear foot rod (3) and folded.

13. A baby carriage frame according to claim 5, characterized in that It also includes a handrail (8), which is connected to the first linkage assembly (51) and is configured to be folded in a coordinated manner when the push rod (4) is folded toward the rear foot rod (3).

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