Baby carriage frame

Abstract

The utility model discloses a baby carriage frame which 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 utility model relates to a baby carriage technical field, especially a baby carriage frame. BACKGROUND

[0002] When parents take infants and young children out, they generally take a child stroller. The traditional child stroller is large in size and still large in size after folding, so there is a problem of inconvenience in carrying out. In addition, with the improvement of living standards, people's demand for travel convenience is getting higher and higher. Therefore, the operability of the child stroller when folding and the size of the child stroller after folding become the focus of consumers. More specifically, as for the folding child stroller, the better the linkage of each component of the child stroller, the easier the folding and unfolding operation, otherwise, it is laborious to operate. As for the size of the child stroller after folding, in order to meet the carrying when taking a train or an airplane, of course, it is desirable that the size of the child stroller after folding is as small as possible; even if it is not used but stored at home, the smaller the folding size, the less the occupied space.

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

[0004] 1. It cannot be fully folded, and the occupied volume of the child stroller after folding is still large, which is not conducive to carrying and transporting.

[0005] 2. The structure is complex, and the production cost is high.

[0006] 3. The user needs to fold a number of components separately, such as secondary folding, which is time-consuming and laborious to operate.

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

[0008] Therefore, the utility model is proposed to solve the above problems. CONTENT OF THE UTILITY MODEL

[0009] The utility model aims at overcoming the defects of the prior art, providing a baby carriage frame, through the linkage of the frame linkage assembly in the process of the push rod approaching the rear leg rod to fold, the linkage of the front leg rod approaching the rear leg rod to fold, and the linkage of the two rear leg rods at the lower end to fold, so that the distance between the two rear wheel groups is less than the distance between the two front wheel groups, which is beneficial to make the overall structure of the baby carriage frame after folding more compact and minimize the volume, and facilitate carrying and packaging and transportation.

[0010] The utility model discloses a baby carriage frame, can be switched between the unfolded use state and the folding use state, including frame connecting piece 1, front leg 2, rear leg 3 and push rod 4, front leg 2, rear leg 3, push rod 4 corresponding with frame connecting piece 1 rotatable connection, front leg 2 lower end is connected with front wheel group 20, rear leg 3 lower end is connected with rear wheel group 30, the interval of two rear wheel groups is greater than the interval of two front wheel groups when baby carriage frame unfolds, baby carriage frame still includes frame locking and unlocking mechanism 6 and sets up in frame connecting piece 1, front leg 2, rear leg 3 and push rod 4 between frame linkage assembly 5, frame linkage assembly 5 is configured to in the process of push rod 4 to rear leg 3 convergence folding, the front leg 2 convergence folding to rear leg 3 in coordination linkage, and the lower end of two rear legs 3 is folded to each other and makes the interval of two rear wheel groups less than the interval of two front wheel groups.

[0011] As above described a baby carriage frame, the upper end of front leg 2 and frame connecting piece 1 between rotatable connection around pivot shaft A, the upper end of rear leg 3 and frame connecting piece 1 between rotatable connection around pivot shaft B and pivot shaft A vertical, the lower end of push rod 4 and frame connecting piece 1 between rotatable connection around pivot shaft C and pivot shaft A parallel or coaxial, frame linkage assembly 5 links two rear legs 3 and makes two rear wheel groups between the inside of two front wheel groups.

[0012] As above described a baby carriage frame, baby carriage frame still includes with frame connecting piece 1 movable connection seat part 7, frame linkage assembly 5 and seat part 7 linkable connection, frame linkage assembly 5 is configured to in the process of push rod 4 to rear leg 3 convergence folding, the corresponding folding of seat part 7 in coordination linkage.

[0013] As above described a baby carriage frame, the side of seat part 7 and frame connecting piece 1 rotatable and slidably connected, frame linkage assembly 5 is configured to in the process of push rod 4 to rear leg 3 convergence folding, linkage seat part 7 slides back and turns over and folds and makes seat part 7 front part not protrude on the upper surface of frame connecting piece 1.

[0014] As above described a baby carriage frame, frame linkage assembly 5 includes first linkage assembly 51 and second linkage assembly 52, first linkage assembly 51 is located between rear leg 3, push rod 4 and seat part 7, first linkage assembly 51 is configured to in the process of push rod 4 to rear leg 3 convergence folding for linkage seat part 7 corresponding folding, second linkage assembly 52 is located between front leg 2, rear leg 3 and first linkage assembly 51, second linkage assembly 52 is configured to in the process of push rod 4 to rear leg 3 convergence folding by first linkage assembly 51 corresponding linkage, in turn linkage front leg 2 convergence folding to rear leg 3 and linkage lower end of two rear legs 3 folds to each other.

[0015] A stroller frame as described above, 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 for locking the first linkage assembly 51; the unlocking mechanism 63 is located on the push rod 4 for linkage unlocking action of the first locking mechanism 61; the second locking mechanism 62 is located between the frame connecting piece 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 during the folding process of the push rod 4 to the rear leg 3.

[0016] A stroller frame as described above, the push rod 4 comprises 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 piece 1 around the pivot shaft 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 of the seat part 7 is rotatably and slidably connected to the frame connecting piece 1, and the rear of the seat part 7 is directly or indirectly connected to the first linkage assembly 51 and the second linkage assembly 52.

[0017] A stroller frame as described above, the first linkage assembly 51 comprises a first drive rod 511, a first support rod 512 and a first linkage rod 513, the upper end of the first drive rod 511 is rotatably connected to the lower end of the handlebar rod 42, the lower end of the first drive rod 511 is rotatably connected to the lower end of the first support rod 512 and the rear end of the seat part 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 directly or indirectly rotatably connected to the lower end of the first drive rod 511, and the lower end of the first linkage rod 513 is rotatably connected to the second linkage assembly 52.

[0018] A stroller frame as described above, 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.

[0019] A stroller frame as described above, 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 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 leg 2, the rear end of the second linkage front rod 522 is rotatably connected to the front of the second connecting seat 521, one end of the second linkage rear rod 523 is rotatably connected to the rear leg 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 connecting piece 1.

[0020] A stroller frame as described above, two frame connectors 1 are connected by a frame crossbar 11; the second locking mechanism 62 comprises a static locking part 624 arranged on the frame crossbar 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 locked with each other, and the static locking part 624 is configured to be separated from the dynamic locking part 625 by a release force during the folding process of the push rod 4 to the rear legs 3, and the dynamic locking part 625 is moved towards the lower end of the rear legs 3 under the traction of the second linkage assembly 52.

[0021] A stroller frame as described above, the second linkage assembly 52 comprises a second connecting seat 521 and a second linkage rear rod 523, the rear part of the second connecting seat 521 is rotatably connected with the first linkage assembly 51, one end of the second linkage rear rod 523 is rotatably connected with the rear legs 3, and the other end of the second linkage rear rod 523 is rotatably connected with the side of the second connecting seat 521; the dynamic locking part 625 is arranged on the second connecting seat 521, the dynamic locking part 625 is provided with a second locking hook 621, the static locking part 624 is provided with a locking mouth 6241, the side of the locking mouth 6241 is provided with a second locking block 622 for locking the second locking hook 621 inserted into the locking mouth 6241, and the second locking block 622 is configured to be released during the folding process of the push rod 4 to the rear legs 3.

[0022] A stroller frame as described above, further comprising a handrail 8, the handrail 8 is connected with the first linkage assembly 51 and is configured to be folded in coordination during the folding process of the push rod 4 to the rear legs 3.

[0023] Compared with the prior art, the utility model has the advantages of:

[0024] 1、The utility model discloses in the folding process, only need to operate the frame locking and unlocking mechanism to remove the locking of the stroller frame, then make the push rod to the rear legs close folding, in the above push rod folding process, the push rod is through the frame linkage assembly and is coordinated with the linkage rear legs close folding and the linkage both rear legs lower end opposite folding to make the interval of two rear wheel groups less than the interval of two front wheel groups, be favorable to make the overall structure of the stroller frame after folding more compact, the minimum volume is convenient for carrying and transportation, and convenient to use.

[0025] 2、In order to further make the overall structure of the stroller frame after folding more compact, the two rear wheel groups are arranged between the inside of two front wheel groups after the stroller frame is folded, so as to be favorable to reduce the thickness size of packing box.

[0026] 3、In order to operate the unlocking convenient, the utility model only needs to manually operate the unlocking mechanism to remove the locking state of the first locking mechanism, and then the second locking mechanism can be unlocked.

[0027] 4、The lower push rod, the handlebar rod, the first driving rod and the first supporting rod are connected to form a four-bar linkage mechanism, the lower push rod, the frame connecting piece, the seat part and the first supporting rod are connected to form a four-bar linkage mechanism, the first supporting rod is used as a common side of the two four-bar linkage mechanisms, so that the other four-bar linkage mechanism is locked and unlocked correspondingly by controlling the four-bar linkage mechanism where the handlebar rod is located, and the structure design is reasonable and linkage is smooth.

[0028] 5、The frame linkage assembly is used for sliding and overturning the seat part backward in the folding process of the push rod to the rear rod, so that the front part of the seat part is not protruded on the upper surface of the frame connecting piece, the height direction of the folded child bicycle is more compact, and the height size of the packaging box is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] The specific embodiments of the utility model will be further described in detail below in combination with the drawings, wherein:

[0030] Figure 1 Fig. 1 is a three-dimensional structure schematic diagram of the utility model in the unfolded use state.

[0031] Figure 2 Fig. 2 is another three-dimensional structure schematic diagram of the utility model in the unfolded use state.

[0032] Figure 3 Fig. 3 is a three-dimensional structure schematic diagram of the utility model in the unfolded use state.

[0033] Figure 4 Fig. 4 is a side view structure schematic diagram of the utility model in the unfolded use state.

[0034] Figure 5 Fig. 5 is a three-dimensional structure schematic diagram of the utility model in the folding process.

[0035] Figure 6 Fig. 6 is another three-dimensional structure schematic diagram of the utility model in the folding process.

[0036] Figure 7 Fig. 7 is a side view structure schematic diagram of the utility model in the folding process.

[0037] Figure 8 Fig. 8 is a side view structure schematic diagram of the utility model in the folded use state.

[0038] Figure 9 Fig. 9 is a sectional view structure schematic diagram of the utility model.

[0039] Figure 10 Fig. 10 is a three-dimensional structure schematic diagram of the utility model.

[0040] Figure 11The utility model discloses an explosion structure schematic diagram no.

[0041] Figure 12 The utility model discloses an explosion structure schematic diagram no.

[0042] Figure 13 The utility model discloses an explosion structure schematic diagram no.

CONCRETE IMPLEMENTATIONS

[0043] The utility model discloses an explosion structure schematic diagram no.

[0044] As Figures 1-13 The utility model discloses a baby carriage frame can switch between the unfolded use state and the folding use state, including frame connecting piece 1, front leg 2, rear leg 3 and push rod 4, front leg 2, rear leg 3, push rod 4 are rotatablely connected with frame connecting piece 1 correspondingly, the lower end of front leg 2 is connected with front wheel group 20, the lower end of rear leg 3 is connected with rear wheel group 30, the interval of two rear wheel groups is greater than the interval of two front wheel groups when the baby carriage frame unfolds, the baby carriage frame still includes frame locking and unlocking mechanism 6 and sets up in frame connecting piece 1, front leg 2, rear leg 3 and push rod 4 between frame linkage assembly 5, frame linkage assembly 5 is configured to in the folding process of push rod 4 to rear leg 3 convergence, the front leg 2 is cooperatively linked to the rear leg 3 convergence and linkage two rear legs 3 lower end convergence to make the interval of two rear wheel groups less than the interval of two front wheel groups. The utility model only needs to operate frame locking and unlocking mechanism to release the locking of baby carriage frame in the folding process, then makes push rod to rear leg convergence, in the above push rod folding process, push rod cooperatively links to the rear leg 2 convergence and linkage two rear legs 3 lower end convergence through frame linkage assembly to make the interval of two rear wheel groups less than the interval of two front wheel groups, is favorable to make the overall structure of folding baby carriage frame more compact, the volume minimization, convenient to carry and package transportation, convenient to use, reasonable in design.

[0045] As Figures 1-8 In order to fold stably and realize folding in multiple directions, the upper end of the front leg 2 is rotatably connected with the frame connecting piece 1 around a pivot shaft A, the upper end of the rear leg 3 is rotatably connected with the frame connecting piece 1 around a pivot shaft B perpendicular to the pivot shaft A, and the lower end of the push rod 4 is rotatably connected with the frame connecting piece 1 around a pivot shaft C parallel or coaxial with the pivot shaft A.

[0046] As Figure 10 In order to make the overall structure of the folded baby carriage frame more compact and the volume minimized, the frame linkage assembly 5 links the two rear legs 3 to converge and make the two rear wheel groups placed between the inner sides of the two front wheel groups, so as to facilitate reducing the thickness of the packaging box.

[0047] AsFigures 1-8 As shown, the stroller frame further comprises a seat part 7 movably connected with the frame connecting part 1, and the frame linkage assembly 5 is movably connected with the seat part 7, and the frame linkage assembly 5 is configured to cooperatively link the seat part 7 to be folded correspondingly during the folding process of the push rod 4 to the rear legs 3. In this embodiment, the frame linkage assembly 5 cooperatively links the front leg, the seat part and the two rear legs to be folded correspondingly during the folding process of the push rod 4 to the rear legs 3, thereby realizing the function of one-key folding.

[0048] As shown in Figure 8 , the side part of the seat part 7 is rotatably and slidably connected with the frame connecting part 1, and the frame linkage assembly 5 is configured to link the seat part 7 to slide backward and to be folded by turning over during the folding process of the push rod 4 to the rear legs 3, so that the front part of the seat part 7 does not protrude from the upper surface of the frame connecting part 1, which is beneficial to make the height direction of the folded stroller frame more compact and to reduce the height dimension of the packaging box.

[0049] As shown in Figure 1 , 2 , a guiding sliding mechanism is arranged between the side part of the seat part 7 and the frame connecting part 1, and the guiding sliding mechanism comprises a guiding sliding groove 71 arranged on the side part of the seat part 7 and extending along the front-rear direction of the seat part 7, and a guiding pivot 12 arranged on the frame connecting part 1 and placed in the guiding sliding groove 61. Figure 1 As shown, the rear end of the seat part 7 is rotatably connected with the lower end of the first driving rod 511 and the first supporting rod 512.

[0050] As shown in Figures 1-8 , 11, 13, in order to link conveniently and efficiently, the frame linkage assembly 5 comprises a first linkage assembly 51 and a second linkage assembly 52; the first linkage assembly 51 is located between the rear legs 3, the push rod 4 and the seat part 7, and the first linkage assembly 51 is configured to link the seat part 7 to be folded correspondingly during the folding process of the push rod 4 to the rear legs 3; the second linkage assembly 52 is located between the front leg 2, the rear legs 3 and the first linkage assembly 51, and the second linkage assembly 52 is configured to be correspondingly linked by the first linkage assembly 51 during the folding process of the push rod 4 to the rear legs 3, and then to link the front leg 2 to be folded to the rear legs 3 and to link the lower ends of the two rear legs 3 to be folded to each other.

[0051] As shown in Figure 1 , 10, 11, 13, in order to linkage reliable, the first linkage assembly 51 includes first drive rod 511, first support rod 512 and first linkage rod 513, the first drive rod 511 upper end and handlebar 42 lower end rotatable connection, the first drive rod 511 lower end and first support rod 512 lower end and seat 7 rear rotatable connection, the first support rod 512 upper end and lower push rod 41 lower rotatable connection, the first linkage rod 513 upper end directly or indirectly with the first drive rod 511 lower end rotatable connection, the first linkage rod 513 lower end and second linkage assembly 52 rotatable connection, the lower push rod 41, handlebar 42, first drive rod 511 and first support rod 512 between the connection constitutes four connecting rod mechanism, the lower push rod 41, frame connecting piece 1, seat 7 and first support rod 512 between the connection constitutes four connecting rod mechanism;First support rod 512 is the common edge of two four connecting rod mechanism, so when the four connecting rod mechanism of handlebar 42 is locked, the folding of the stroller frame in the front and rear direction is limited.

[0052] As shown in Figures 1-8 , in order to fold the structure more compact, the push rod 4 includes lower push rod 41 and handlebar 42, the lower push rod 41 lower end and frame connecting piece 1 rotatable connection around the pivot axis C, the handlebar 42 lower part and lower push rod 41 upper end rotatable connection;The seat 7 side and frame connecting piece 1 rotatable and slidable connection, the seat 7 rear part directly or indirectly corresponding with the first linkage assembly 51 and second linkage assembly 52 connection.

[0053] As shown in Figures 1-8 , 11, 13, in order to linkage reliable, the first linkage assembly 51 includes first drive rod 511, first support rod 512 and first linkage rod 513, the first drive rod 511 upper end and handlebar 42 lower end rotatable connection, the first drive rod 511 lower end and first support rod 512 lower end and seat 7 rear rotatable connection, the first support rod 512 upper end and lower push rod 41 lower rotatable connection, the first linkage rod 513 upper end directly or indirectly with the first drive rod 511 lower end rotatable connection, the first linkage rod 513 lower end and second linkage assembly 52 rotatable connection, the lower push rod 41, handlebar 42, first drive rod 511 and first support rod 512 between the connection constitutes four connecting rod mechanism, the lower push rod 41, frame connecting piece 1, seat 7 and first support rod 512 between the connection constitutes four connecting rod mechanism;First support rod 512 is the common edge of two four connecting rod mechanism, so when the four connecting rod mechanism of handlebar 42 is locked, the folding of the stroller frame in the front and rear direction is limited.

[0054] As shown in Figure 1 , 11As shown in Figs. 11, 13, the lower end of the first driving rod 511 is rotatably connected with the linkage horizontal rod 510, the lower end of the first supporting rod 512 and the upper end of the first linkage rod 513 are fixedly connected with the linkage horizontal rod 510, and the rear end of the seat part 7 is rotatably connected with the linkage horizontal rod 510.

[0055] As shown in Figs. 11, 13, the lower end of the first driving rod 511 is rotatably connected with the linkage horizontal rod 510, the lower end of the first supporting rod 512 and the upper end of the first linkage rod 513 are fixedly connected with the linkage horizontal rod 510, and the rear end of the seat part 7 is rotatably connected with the linkage horizontal rod 510. Figure 1

[0056] As shown in Figs. 11, 13, the lower end of the first driving rod 511 is rotatably connected with the linkage horizontal rod 510, the lower end of the first supporting rod 512 and the upper end of the first linkage rod 513 are fixedly connected with the linkage horizontal rod 510, and the rear end of the seat part 7 is rotatably connected with the linkage horizontal rod 510. Figures 1-8

[0057] As shown in Figs. 11, 13, the lower end of the first driving rod 511 is rotatably connected with the linkage horizontal rod 510, the lower end of the first supporting rod 512 and the upper end of the first linkage rod 513 are fixedly connected with the linkage horizontal rod 510, and the rear end of the seat part 7 is rotatably connected with the linkage horizontal rod 510. Figure 9 10 As shown in Figs. 11, 13, the lower end of the first driving rod 511 is rotatably connected with the linkage horizontal rod 510, the lower end of the first supporting rod 512 and the upper end of the first linkage rod 513 are fixedly connected with the linkage horizontal rod 510, and the rear end of the seat part 7 is rotatably connected with the linkage horizontal rod 510.

[0058] As shown in Figs. 11, 13, the lower end of the first driving rod 511 is rotatably connected with the linkage horizontal rod 510, the lower end of the first supporting rod 512 and the upper end of the first linkage rod 513 are fixedly connected with the linkage horizontal rod 510, and the rear end of the seat part 7 is rotatably connected with the linkage horizontal rod 510. Figure 9 10 ​​​​As shown, for reliable locking, the second linkage component 52 includes a second connecting seat 521 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. 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 moving locking part 625 is provided on the second connecting seat 521. The moving locking part 625 is provided with a second locking hook 621. The stationary locking part 624 is provided with a locking slot 6241. The side of the locking slot 6241 is provided with a second locking block 622 to lock the second locking hook 621 inserted into the locking slot 6241. The second locking block 622 is configured to be released by linkage during the process of the push rod 4 moving towards the rear foot rod 3. The stationary locking part 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 rope is provided between the second locking block 622 and the lower end of the handle bar 42. The lower end of the unlocking rope is connected to the second locking block 622, and the upper end of the unlocking rope is connected to the lower end of the handle bar 42.

[0059] For easy folding and unfolding, a handrail 8 is also included. The handrail 8 is connected to the first linkage component 51 and configured to be folded in coordination with the push rod 4 as it moves towards 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 part for connecting with the handrail rod 8.

[0060] like Figures 1-8 As shown, during folding, the unlocking mechanism 63 is operated in conjunction with the unlocking action of the first locking mechanism 61 to release the locking state of the handlebar 42 relative to the downward push rod 41. Then, the handlebar 42 is operated to flip forward relative to the downward push rod 41 and fold towards the side of the downward push rod 41. During the aforementioned flipping and folding process of the handlebar 42, the handlebar 41 is unlocked by the unlocking pull rope in conjunction with the unlocking action of the second locking block 622, causing the second locking block 622 to separate 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 connector 1. Next, operate the push rod 41 downwards and folds it towards the rear leg 2. The push rod 41, through the first drive rod 511 and the first support rod 512, links the seat part 7 to slide backwards and flip, folding it towards the rear leg 2. The push rod 41, through the first drive rod 511, the first support rod 512, and the first linkage rod 513, drives the second connecting seat 521 to move the rear end of the second linkage front rod 522 and one end of the two second linkage rear rods 523 downwards, causing the front leg 1 to flip backwards and fold towards the rear leg, and causing the two rear leg 2 to fold towards each other, until the folding operation of the entire stroller frame is completed. Figure 8 As shown.

Claims

1. A stroller frame switchable between an unfolded use condition and a folded use condition, characterized in that The child stroller frame comprises a frame connecting piece (1), a front leg rod (2), a rear leg rod (3) and a push rod (4), the front leg rod (2), the rear leg rod (3) and the push rod (4) are rotatably connected with the frame connecting piece (1) respectively, the lower end of the front leg rod (2) is connected with a front wheel set (20), the lower end of the rear leg rod (3) is connected with a rear wheel set (30), the distance between the two rear wheel sets is greater than the distance between the two front wheel sets when the child stroller frame is unfolded, the child stroller frame further comprises a frame locking and unlocking mechanism (6) and a frame linkage assembly (5) arranged between the frame connecting piece (1), the front leg rod (2), the rear leg rod (3) and the push rod (4), the frame linkage assembly (5) is configured to cooperatively link the front leg rod (2) to the rear leg rod (3) during the folding process of the push rod (4) to the rear leg rod (3), and link the lower ends of the two rear leg rods (3) to fold towards each other so that the distance between the two rear wheel sets is less than the distance between the two front wheel sets.

2. A stroller frame according to claim 1, wherein The upper end of the front leg rod (2) is rotatably connected with the frame connecting piece (1) around a pivot shaft A, the upper end of the rear leg rod (3) is rotatably connected with the frame connecting piece (1) around a pivot shaft B which is perpendicular to the pivot shaft A, the lower end of the push rod (4) is rotatably connected with the frame connecting piece (1) around a pivot shaft C which is parallel or coaxial with the pivot shaft A, and the frame linkage assembly (5) links the two rear leg rods (3) to fold towards each other and makes the two rear wheel sets between the two front wheel sets.

3. The stroller frame of claim 1, wherein The child stroller frame further comprises a seat part (7) movably connected with the frame connecting piece (1), the frame linkage assembly (5) is linkably connected with the seat part (7), and the frame linkage assembly (5) is configured to cooperatively link the seat part (7) to fold during the folding process of the push rod (4) to the rear leg rod (3).

4. A stroller frame according to claim 3, wherein The side part of the seat part (7) is rotatably and slidably connected with the frame connecting piece (1), and the frame linkage assembly (5) is configured to link the seat part (7) to slide and fold backwards during the folding process of the push rod (4) to the rear leg rod (3) so that the front part of the seat part (7) does not protrude from the upper surface of the frame connecting piece (1).

5. The stroller frame of claim 3, wherein The frame linkage assembly (5) comprises a first linkage assembly (51) and a second linkage assembly (52). The first linkage assembly (51) is located between the rear leg rod (3), the push rod (4) and the seat part (7), and is configured to link the seat part (7) to fold during the folding process of the push rod (4) to the rear leg rod (3). The second linkage assembly (52) is located between the front leg rod (2), the rear leg rod (3) and the first linkage assembly (51), and is configured to be linked by the first linkage assembly (51) during the folding process of the push rod (4) to the rear leg rod (3), and then link the front leg rod (2) to the rear leg rod (3) to fold and link the lower ends of the two rear leg rods (3) to fold towards each other.

6. A stroller frame according to claim 5, wherein 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) to lock the first linkage assembly (51). The unlocking mechanism (63) is located on the push rod (4) for linkage of the unlocking action of the first locking mechanism (61); The second locking mechanism (62) is located between the frame connecting piece (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) during the folding process of the push rod (4) to the rear foot rod (3).

7. A stroller frame according to claim 6, wherein 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 with the frame connecting piece (1) around the pivot axis C, and the lower part of the handlebar rod (42) is rotatably connected with the upper end of the lower push rod (41); the side part of the seat part (7) is rotatably and slidably connected with the frame connecting piece (1), and the rear part of the seat part (7) is directly or indirectly connected with the first linkage assembly (51) and the second linkage assembly (52) correspondingly.

8. A stroller frame according to claim 7, wherein The first linkage assembly (51) includes a first drive rod (511), a first support rod (512) and a first linkage rod (513), the upper end of the first drive rod (511) is rotatably connected with the lower end of the handlebar rod (42), the lower end of the first drive rod (511) is rotatably connected with the lower end of the first support rod (512) and the rear end of the seat part (7), the upper end of the first support rod (512) is rotatably connected with the lower part of the lower push rod (41), and the upper end of the first linkage rod (513) is directly or indirectly rotatably connected with the lower end of the first drive rod (511), and the lower end of the first linkage rod (513) is rotatably connected with the second linkage assembly (52).

9. The stroller frame of claim 7, wherein 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).

10. A stroller frame according to any one of claims 6-9, wherein 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 part of the second connecting seat (521) is rotatably connected with the first linkage assembly (51), the front end of the second linkage front rod (522) is rotatably connected with the front foot rod (2), the rear end of the second linkage front rod (522) is rotatably connected with the front part of the second connecting seat (521), one end of the second linkage rear rod (523) is rotatably connected with the rear foot rod (3), and the other end of the second linkage rear rod (523) is rotatably connected with the side part of the second connecting seat (521); the second locking mechanism (62) is located between the second connecting seat (521) and the frame connecting piece (1).

11. The stroller frame of claim 6, wherein The two frame connecting members (1) are connected by a frame cross bar (11); the second locking mechanism (62) comprises 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 locked with each other, and the static locking part (624) is configured to be separated from the dynamic locking part (625) under the release force during the folding process of the push rod (4) to the rear foot rod (3), and the dynamic locking part (625) is moved to the lower end of the rear foot rod (3) under the traction of the second linkage assembly (52).

12. A stroller frame according to claim 11, wherein The second linkage assembly (52) comprises a second connecting seat (521) and a second linkage rear rod (523), the rear part of the second connecting seat (521) is rotatably connected with the first linkage assembly (51), one end of the second linkage rear rod (523) is rotatably connected with the rear foot rod (3), and the other end of the second linkage rear rod (523) is rotatably connected with the side part of the second connecting seat (521); the dynamic locking part (625) is arranged on the second connecting seat (521), the dynamic locking part (625) is provided with a second locking hook (621), the static locking part (624) is provided with a locking mouth (6241), the side of the locking mouth (6241) is provided with a second locking block (622) for locking the second locking hook (621) inserted into the locking mouth (6241), and the second locking block (622) is configured to be released by linkage during the folding process of the push rod (4) to the rear foot rod (3).

13. The stroller frame of claim 5, wherein The handrail rod (8) is connected with the first linkage assembly (51) and is configured to be folded coordinately during the folding process of the push rod (4) to the rear foot rod (3).

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