Strollers

Abstract

The invention discloses a stroller for children, wherein the stroller frame comprises a push rod frame, a front support and a rear support, a front wheel assembly is arranged at the bottom of the front support, a rear wheel assembly is arranged at the bottom of the rear support, an upper end portion of the front support, an upper end portion of the rear support and a lower end portion of the push rod frame are rotatably connected to each other through a rotating joint, and when the stroller frame is in an unfolded state, the push rod frame has a forward working position extending from front to rear and an inclination extending from rear to front in its rotation stroke, and when the stroller frame is in a folded state, the stroller frame has a forward folding position in which the stroller frame is folded at the rear side of the rear support and a reverse folding position in which the push rod frame is folded at the front side of the front support. In this way, no matter the push rod frame is in the forward working position or the reverse working position, the push rod frame can be turned over toward the side where the user is located to fold the stroller frame, thereby facilitating the operation of the user.

Description

Technical Field

[0001] The invention relates to a baby stroller. Background Art

[0002] In the prior art, in order to meet the different needs of operators for forward pushing and reverse pushing, the push rod of the child stroller is usually set to a reversible structure. However, for a reversible stroller, during the folding operation, it is often necessary to flip the push rod frame to the rear side of the rear bracket for folding, or it can only be flipped to the front side of the front bracket for folding, that is, no matter whether the push rod frame is pushed forward or reversed, when the stroller frame is folded, the stroller frame needs to be flipped in a certain direction to achieve folding. This often requires the user to switch to the other side of the stroller to operate when folding the stroller frame, causing inconvenience in use. In addition, in the prior art, the push rod often needs to be locked with other rods on the stroller frame after reversing in order to determine the position after reversing, which not only makes the overall structure of the stroller frame not simple, but also requires the operator to manually lock the push rod frame after the reversing operation, causing inconvenience in operation. Summary of the invention

[0003] The object of the present invention is to provide a baby stroller which has a simple structure and is easy to operate.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a child stroller, including a stroller frame with an expanded state and a folded state, the stroller frame including a push rod frame, a front bracket and a rear bracket, a front wheel assembly is provided at the bottom of the front bracket, a rear wheel assembly is provided at the bottom of the rear bracket, the upper end portion of the front bracket, the upper end portion of the rear bracket and the lower end portion of the push rod frame are rotatably connected to each other through a rotating joint, when the stroller frame is in the expanded state, the push rod frame has a positive working position extending from front to rear and tilting upward and a reverse working position extending from rear to front and tilting upward in its rotation stroke, and when the stroller frame is in the folded state, the stroller frame has a positive folding position in which the stroller frame is folded to the rear side of the rear bracket and a reverse folding position in which the push rod frame is folded to the front side of the front bracket.

[0005] Preferably, a push rod limit assembly is provided in the rotating joint, and the push rod limit assembly includes a reversing limit piece provided on the push rod frame and rotating therewith, a driving slider provided on the front bracket or the rear bracket and capable of cooperating with the reversing limit piece, and the driving slider has a first limit position and a second limit position on its sliding path. When the push rod frame is between the forward working position and the reverse working position, the reversing limit piece cooperates with the driving slider and drives the driving slider to slide when the push rod frame rotates; when the push rod frame is in the forward working position, the driving slider is in the first limit position; when the push rod frame is in the reverse working position, the driving slider is in the second limit position, and when the push rod frame is rotated and retracted from the forward working position to the rear side of the rear bracket, and when the push rod frame is rotated and retracted from the reverse working position to the front side of the front bracket, the reversing limit piece and the driving slider are disengaged.

[0006] Preferably, the lower end of the push rod frame is rotationally connected to the upper end of the rear bracket around a first rotation center line, and the upper end of the rear bracket is rotationally connected to the upper end of the front bracket around a second rotation center line, the first rotation center line and the second rotation center line extend parallel to or colinearly with each other, and the rotation joint is provided with a first locking structure for locking the push rod frame and the rear bracket to each other, and a second locking structure for locking the front bracket and the rear bracket to each other, when the push rod frame rotates between the forward working position and the reverse working position, the first locking structure is unlocked and the second locking structure remains locked; when the push rod frame rotates from the forward working position to the rear bracket, and when the push rod frame rotates from the reverse working position to the front bracket, the push rod frame drives the second locking structure to unlock.

[0007] Furthermore, the rotating joint is also provided with a limit unlocking structure for driving the reversing limit member to disengage from the driving slider. When the cart frame is converted from an unfolded state to a folded state, the disengagement between the reversing limit member and the driving slider precedes the unlocking of the second lock structure.

[0008] Furthermore, an unlocking member for unlocking the first locking structure is provided on the rotating joint, and the limit unlocking structure is provided between the unlocking member and the reversing limit member, and when the unlocking member moves, the reversing limit member is driven to separate from the driving slider.

[0009] Furthermore, the reversing limit member is slidably arranged on the push rod frame along a direction parallel to the first rotation center line, and a limit protrusion is provided on the end of the reversing limit member facing the driving slider, and the driving slider has a guide groove for the limit protrusion to be slidably inserted, and the limit protrusion can be inserted in the guide groove and can slide along the guide groove.

[0010] As a specific embodiment, the unlocking member includes an unlocking slider slidably arranged on the push rod frame, the sliding direction of the unlocking slider is perpendicular to the first rotation center line, the unlocking slider is provided with a driving inclined surface, and the reversing limit member is provided with a matching inclined surface. When the unlocking slider moves along its sliding direction and unlocks the first lock structure and continues to slide, the driving inclined surface cooperates with the matching inclined surface and drives the reversing limit member to move away from the driving slider.

[0011] Preferably, the front wheel assembly includes a front wheel joint which is rotatably connected to the front bracket around the front steering axis, a front wheel orientation assembly is provided between the front bracket and the front wheel joint, the rear wheel assembly includes a rear wheel joint which is rotatably connected to the rear bracket around the rear steering axis, a rear wheel orientation assembly is provided between the rear bracket and the rear wheel joint, the front wheel orientation assembly and the rear wheel orientation assembly respectively have a freely steerable directional unlocking state and a steering locked directional locking state, when the cart frame is in a folded state, the front bracket and the rear bracket are close to each other, and the rear wheel orientation assembly and the front wheel orientation assembly are both in a directional locking state.

[0012] Preferably, the front wheel assembly comprises a front wheel joint rotatably connected to the front bracket around a front steering axis, a front wheel orientation assembly is provided between the front bracket and the front wheel joint, the rear wheel assembly comprises a rear wheel joint rotatably connected to the rear bracket around a rear steering axis, a rear wheel orientation assembly is provided between the rear bracket and the rear wheel joint, the front wheel orientation assembly and the rear wheel orientation assembly respectively have a freely steerable orientation unlocking state and a steering locked orientation locking state,

[0013] When the push rod frame is in the forward working position, the driving slider cooperates with the rear wheel orientation assembly to put it in a orientation locking state, and the front wheel orientation assembly disengages from the driving slider and is in a orientation unlocking state; when the push rod frame is in the reverse working position, the driving slider cooperates with the front wheel orientation assembly to put it in a orientation locking state, and the rear wheel orientation assembly disengages from the driving slider and is in a orientation unlocking state.

[0014] Furthermore, when the cart frame is in the unfolded state and the push rod frame is located between the forward working position and the reverse working position, the front wheel orientation assembly and the rear wheel orientation assembly are respectively disengaged from the driving slider and are respectively in the orientation unlocked state.

[0015] Further, the front wheel orientation assembly comprises a front orientation piece arranged at the bottom of the front bracket and capable of moving toward or away from the front wheel joint, a front orientation elastic piece for providing a movement tendency of the front orientation piece toward the front wheel joint, a front slider arranged on the front bracket and capable of moving up and down along a length extension direction of the front bracket, a front locking elastic piece for providing an upward movement tendency of the front slider, and a front connecting piece connected between the front orientation piece and the front slider, and a front orientation slot for the front orientation piece to be cooperatively inserted is provided on the front wheel joint;

[0016] The rear wheel orientation assembly includes a rear orientation piece disposed at the bottom of the rear bracket so as to be movable toward or away from the rear wheel joint, a rear orientation elastic piece for providing a movement tendency of the rear orientation piece toward the rear wheel joint, a rear slider disposed on the rear bracket so as to move up and down along a length extension direction of the rear bracket, a rear locking elastic piece for providing an upward movement tendency of the rear slider, and a rear connecting piece connected between the rear orientation piece and the rear slider, wherein a rear orientation groove is provided on the rear wheel joint for the rear orientation piece to be cooperatively inserted into.

[0017] Furthermore, when the push rod frame is in the forward working position, the driving slider abuts against the rear slider to make it move downward, and the rear directing member is cooperatively inserted in the rear directing groove to make the rear wheel directing assembly in a directional locking state, and the driving slider is disengaged from the front slider; when the push rod frame is in the reverse working position, the driving slider abuts against the front slider to make it move downward, and the front directing member is cooperatively inserted in the front directing groove to make the front wheel directing assembly in a directional locking state, and the driving slider is disengaged from the rear slider.

[0018] Furthermore, a front convex portion is provided on the upper end portion of the front bracket, and a rear convex portion is provided on the upper end portion of the rear bracket. When the cart frame is in a folded state, the front bracket and the rear bracket are close to each other, the front convex portion presses against the rear slider, and the rear convex portion presses against the front slider, respectively making the rear wheel orientation assembly and the front wheel orientation assembly in a directional locking state.

[0019] Preferably, the child stroller further comprises a foldable seat frame, wherein the seat frame is mounted on the stroller frame via a seat bracket, and when the stroller is in a forward folding position and a reverse folding position, the seat frame is folded to the front side of the front bracket.

[0020] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0021] 1. The baby stroller of the present invention has a simple structure, and the reversing operation of the push rod frame is convenient and simple;

[0022] 2. Regardless of whether the push rod frame is in the forward working position or the reverse working position, the push rod frame can be flipped toward the user's side to fold the cart frame, which is convenient for the user's operation;

[0023] 3. The push rod frame can also automatically realize the conversion of the directional locking and directional unlocking states of the front wheel assembly and the rear wheel assembly during the reversing operation;

[0024] 4. During the reversing operation, when the push rod frame is rotated to a position between the forward working position and the reverse working position, the front wheel assembly and the rear wheel assembly are both in a universal state, which allows the user to stand in place and rotate the cart frame as a whole during the reversing operation without having to walk to the other side to achieve the reversing operation, which is more convenient for the user's daily reversing operation;

[0025] 5. The front bracket, rear bracket and push rod frame on the folded cart frame are tightly gathered together, and can be folded together with the seat rack. The folded cart frame can also stand on the ground by relying on the front wheel assembly and the rear wheel assembly in a directional locking state. It is small in size and convenient to carry and store. Its appearance is more beautiful. At the same time, the push rod reversing operation and folding operation are very simple, which brings great convenience to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Attached Figure 1 It is a three-dimensional diagram of the child stroller of the present invention in a forward unfolding state;

[0027] Attached Figure 2 For attachment Figure 1 Side view of

[0028] Attached Figure 3 It is a side view of the child stroller of the present invention in the forward unfolding state II;

[0029] Attached Figure 4 It is a side view of the child stroller of the present invention in the forward unfolded state;

[0030] Attached Figure 5 It is a side view of the child stroller of the present invention in a reverse unfolded state;

[0031] Attached Figure 6 It is a side view of the child stroller of the present invention in the reverse unfolded state II;

[0032] Attached Figure 7 It is a side view of the child stroller of the present invention in the reverse unfolded state;

[0033] Attached Figure 8 It is a stereoscopic diagram of the child stroller of the present invention during the reversing process;

[0034] Attached Fig. 9 For attachment Figure 8 Side view of

[0035] Attached Fig.10 It is a side view of the child stroller of the present invention in a semi-folded state when folded forward;

[0036] Attached Fig.11 It is a side view of the child stroller of the present invention in a folded state when it is folded forward;

[0037] Attached Fig.12 A side view of the child stroller of the present invention in a semi-folded state when folded backwards;

[0038] Attached Fig.13 A side view of the child stroller of the present invention in a second semi-folded state when folded backwards;

[0039] Attached Fig.14 It is a side view of the child stroller of the present invention in a folded state when it is folded backwards;

[0040] Attached Fig.15 It is a three-dimensional diagram of the child stroller of the present invention in a folded state when it is folded in reverse;

[0041] Attached Fig.16 It is a rear view of the child stroller of the present invention in a folded state when it is folded in reverse;

[0042] Attached Fig.17 For the attachment Fig.16 Schematic diagram of the cross-sectional structure in the middle MM direction;

[0043] Attached Fig.18 The structure of the rotary joint used in the child stroller of the present invention is schematically shown in FIG. Figure 1 ;

[0044] Attached Fig.19 For attachment Fig.18 Schematic diagram of the structural decomposition of the revolute joint Figure 2 ;

[0045] Attached Fig. 20 For attachment Fig.18 A stereoscopic diagram of an unlocking slider in a revolute joint;

[0046] Attached Fig.21 For attachment Fig.18 The three-dimensional structure of the first unlocking drive member in the rotary joint Figure 1 ;

[0047] Attached Fig. 22 For attachment Fig.18The three-dimensional structure of the first unlocking drive member in the rotary joint Figure 2 ;

[0048] Attached Fig.23 For attachment Fig.18 A schematic diagram of the connection between the base portion, the unlocking slider and the reversing limiter in the rotating joint;

[0049] Attached Fig.24 It is a partial cross-sectional schematic diagram of a stroller frame of a stroller for children of the present invention;

[0050] Attached Fig.25 For attachment Fig.24 Enlarged schematic diagram of the middle P part;

[0051] Attached Fig.26 It is a side view of the rotating joint when the cart frame is opened forward;

[0052] Attached Fig. 27 For the attachment Fig.26 A schematic diagram of the enlarged structure in the AA section;

[0053] Attached Fig.28 For attachment Fig.26 Schematic diagram of a transverse section enlargement;

[0054] Attached Fig.29 For attachment Fig.28 Schematic diagram of the matching relationship between the middle driving slider, the front slider and the rear slider;

[0055] Attached Fig.30 It is a side view of the rotating joint when the cart frame is in the middle position of the reversing;

[0056] Attached Fig.31 For the attachment Fig.30 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0057] Attached Fig.32 For attachment Fig.30 Schematic diagram of transverse section;

[0058] Attached Fig.33 It is a side view of the rotating joint when the cart frame is opened in reverse;

[0059] Attached Fig.34 For the attachment Fig.33 Schematic diagram of the cross-sectional structure in CC direction;

[0060] Attached Fig.35 For the attachment Fig.34 Schematic diagram of the cross-sectional structure in the middle DD direction;

[0061] Attached Fig.36 For the attachment Fig.34 Schematic diagram of the cross-sectional structure in the EE direction;

[0062] Attached Fig.37 is a side view of the rotation joint when the stroller frame is in a forward folding position;

[0063] Attached Fig.38 For the attachment Fig.37 An enlarged schematic diagram of the FF-direction cross-sectional structure;

[0064] Attached Fig.39 For attachment Fig.37 Schematic diagram of transverse section;

[0065] Attached Fig.40 is a side view of the rotating joint when the stroller frame is in the reverse folding position;

[0066] Attached Fig.41 For attachment Fig.40 Schematic diagram of transverse section;

[0067] Wherein: 100, cart frame; 10, rear bracket (first rod); 101, first connecting portion; 101a, rear convex portion; 10a, second locking groove; 10b, third locking groove; 10c, through hole;

[0068] 20, front bracket (second rod); 201, second connecting portion; 201a, front protrusion; 20a, fourth locking groove; 202, base frame;

[0069] 30. push rod frame (base rod); 301. base portion; 30a. first locking groove;

[0070] 40. front wheel assembly; 401. front slider; 402. front locking elastic member; 403. front connecting member;

[0071] 50, rear wheel assembly; 501, rear slider; 502, rear locking elastic member; 503, rear connecting member; 504, rear steering shaft; 505, rear wheel joint; 506, rear directional member (rear directional pin); 507, rear directional elastic member;

[0072] 200, rotating joint; 300, seat frame; 3001, first surrounding rod; 3002, second surrounding rod; 3003, handrail; 3004, connecting frame; 400, seat rotating joint;

[0073] 123, rotating shaft; 1, first locking toothed disc; 1a, first locking tooth; 1b, perforation;

[0074] 2. First locking elastic member; 3. First unlocking driving member; 31. Sliding fitting portion; 32. Guide slope; 33. Second unlocking slope;

[0075] 4. Second locking toothed disc; 41. Second locking tooth; 5. Second locking elastic member;

[0076] 6. Second unlocking driving member; 61. Unlocking protrusion;

[0077] 7. driving slide block; 71. guide slide groove; 72. driving end; 73. limiting pin groove;

[0078] 8. Reversing limiter; 81. Limiting convex block; 82. Matching inclined surface;

[0079] 9. Unlocking slider; 91. First unlocking inclined plane; 92. Limiting slide groove; 93. Driving inclined plane. DETAILED DESCRIPTION

[0080] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0081] See also Figures 1 to 16 The child stroller shown in the figure comprises a stroller frame 100 having an unfolded state and a folded state and a foldable seat frame 300. The stroller frame 100 comprises a push rod frame 30, a front bracket 20 and a rear bracket 10. A front wheel assembly 40 is provided at the bottom of the front bracket 20, and a rear wheel assembly 50 is provided at the bottom of the rear bracket 10. On each of the left and right sides of the stroller frame 100, the upper end of the front bracket 20, the upper end of the rear bracket 10 and the lower end of the push rod frame 30 are rotatably connected to each other through a rotating joint 200.

[0082] When the push cart frame 100 is in the unfolded state, the push rod frame 30 has a positive working position extending gradually upward from the front to the rear in its rotation stroke, such as Figures 1 to 4 As shown, and the reverse working position extending from rear to front, as Figures 5 to 7 shown.

[0083] When the push cart frame 100 is in the folded state, the push rod frame 30 is folded to the forward folding position behind the rear support 10. Fig.11 , 12 As shown, the push rod frame 30 is folded in the reverse folding position on the front side of the front bracket 20, as shown in FIG. Figures 12 to 16 shown.

[0084] The seat frame 300 is mounted on the stroller frame 100 through the seat bracket, and is folded to the front side of the front bracket 20 when folded. Figures 10 to 16As shown. The seat frame 300 has a frame including at least a first surrounding rod 3001 and a second surrounding rod 3002 which are rotatably connected, and the frame also includes a handrail 3003. The seat support frame includes a base frame 202 and a connecting frame 3004 which can be detached and assembled with each other. The base frame 202 is fixedly arranged on the upper end of the front bracket 20, and the base frame 202 extends upward and is detachably connected to the lower end of the connecting frame 3004; the upper end of the connecting frame 3004, one end of the first surrounding rod 3001, one end of the second surrounding rod 3002 and one end of the handrail 3003 are rotatably connected together through the seat rotation joint 400 so as to be relatively rotatable to open and close.

[0085] The seat pocket rotating joint 400 is provided with a seat pocket locking structure for locking the surrounding frame relative to the connecting frame 3004 in multiple working positions. When the seat pocket frame 300 is in the unfolded state, the first surrounding rod 3001, the second surrounding rod 3002 and the handrail rod 3003 of the surrounding frame can rotate relative to the connecting frame 3004 when relatively locked, so that the seat pocket frame 300 has multiple adjustable working positions when installed on the stroller frame 100 for use, such as Figures 2 to 7 The seated state, half-lying state and full-lying state shown in the figure can meet the different sitting posture adjustment needs of children. The adjustment of the working state of the seat bag frame 300 and the adjustment of the forward and reverse working positions of the push rod frame 30 on the stroller frame 100 are independent of each other.

[0086] See also Figures 1 to 16 As shown, the two front wheel assemblies 40 and the two rear wheel assemblies 50 are all universal wheel assemblies, wherein, see Fig.17 As shown, the rear wheel assembly 50 includes a rear wheel joint 505 rotatably connected to the rear bracket 10 around a rear steering axis 504, and a rear wheel orientation assembly is provided between the rear bracket 10 and the rear wheel joint 505. The rear wheel orientation assembly has a freely steerable orientation unlocked state and a steering locked orientation locked state.

[0087] In this embodiment, see Fig.17 As shown, the rear wheel orientation assembly includes a rear orientation member 506 disposed at the bottom of the rear bracket 10 and capable of moving toward or away from the rear wheel joint 505, a rear orientation elastic member 507 for providing the rear orientation member 506 with a tendency to move toward the rear wheel joint 505, and a rear orientation slot for the rear orientation member 506 to be inserted in a matching manner is provided on the rear wheel joint 505. Here, the rear orientation member 506 is a positioning pin, and the rear orientation elastic member 507 is a spring. Fig.32As shown, the rear wheel orientation assembly also includes a rear slider 501 disposed on the rear bracket 10 so as to move up and down along the length extension direction of the rear bracket 10, a rear locking elastic member 502 for providing an upward movement tendency for the rear slider 501, and a rear connecting member 503 connected between the rear orientation member 506 and the rear slider 501. Here, the rear connecting member 503 is a traction rope, the rear locking elastic member 502 is also a spring, and the elastic force of the rear locking elastic member 502 is greater than the elastic force of the rear orientation elastic member 507.

[0088] In this way, when there is no external force, the rear slider 501 tends to move upward along the rear bracket 10 under the action of the rear locking elastic member 502, and pulls the rear directional member 506 through the rear connecting member 503, so that the rear directional member 506 is disengaged from the rear directional groove, so that the rear wheel directional assembly is in a directional unlocked state, and the rear wheel assembly 50 can turn freely; and when an external force acts on the rear slider 501 to make it move downward along the rear bracket 10, the rear connecting member 503 releases the pulling on the rear directional member 506, and the rear directional member 506 is inserted downward into the rear directional groove under the elastic force of the rear directional elastic member 507, so that the rear wheel directional assembly is turned into a directional locked state, at which time the rear wheel assembly 50 cannot turn but can only rotate forward in a single direction.

[0089] Similarly, although not shown in the figure, the front wheel assembly 40 includes a front wheel joint that is rotatably connected to the front bracket 20 around the front steering axis. A front wheel orientation assembly is provided between the front bracket 20 and the front wheel joint. The front wheel orientation assembly also has an orientation unlocking state that allows free steering and an orientation locking state that allows steering lock. The front wheel orientation assembly includes a front orientation member that can be moved toward or away from the front wheel joint and is arranged at the bottom of the front bracket 20, a front orientation elastic member that provides a movement tendency of the front orientation member toward the front wheel joint, and a front orientation groove that is cooperatively inserted by the front orientation member on the front wheel joint. Here, the front orientation member also uses a positioning pin, and the front orientation elastic member uses a spring. See FIG. Fig.28 , 32 As shown in Figures 36, the front wheel orientation assembly also includes a front slider 401 disposed on the front bracket 20 to move up and down along the length extension direction of the front bracket 20, a front locking elastic member 402 for providing the front slider 401 with an upward movement tendency, and a front connecting member 403 connected between the front orientation member and the front slider 401. Here, the front connecting member 403 is also a traction rope, the front locking elastic member 402 is also a spring, and the elastic force of the front locking elastic member 502 is greater than the elastic force of the front orientation elastic member. Similarly, when no external force acts on the front slider 401, the front wheel orientation assembly is in an orientation unlocking state; when an external force presses the front slider 401 downward, the front wheel orientation assembly is turned into an orientation locking state.

[0090] As shown in the accompanying drawings, the lower end of the push rod frame 30 is rotatably connected to the upper end of the rear bracket 10 around a first rotation center line, and the upper end of the rear bracket 10 is rotatably connected to the upper end of the front bracket 20 around a second rotation center line, and the first rotation center line and the second rotation center line extend parallel to each other or in a colinear manner. In this embodiment, the first rotation center line and the second rotation center line extend in a colinear manner, that is, the lower end of the push rod frame 30, the upper end of the rear bracket 10, and the upper end of the front bracket 20 are rotatably connected to each other around the same rotation center line, and the three are rotatably connected through a rotating joint 200.

[0091] The specific structure of the rotary joint 200 used in the present invention and its working principle during the conversion process of the cart frame 100 in different working states are described in detail below:

[0092] The rotating joint 200 is used for the rotational connection of three support rods including a base rod having a base portion, a first rod having a first connecting portion, and a second rod having a second connecting portion. In this embodiment, see Figures 18 to 41 As shown, the base rod is correspondingly a push rod frame 30, the first rod is a rear bracket 10, and the second rod is a front bracket 20. Correspondingly, the lower end of the push rod frame 30 is a base portion 301, the upper end of the rear bracket 10 is a first connecting portion 101, and the upper end of the front bracket 20 is a second connecting portion 201. The base portion 301, the first connecting portion 101, and the second connecting portion 201 are rotatably connected through a rotating shaft 123, and they are rotatably connected together around the axis of the rotating shaft 123.

[0093] The rotary joint 200 is provided with a push rod limiting assembly, see Fig.18 , Fig.19 As shown, the push rod limit assembly includes a reversing limit member 8 provided on the base portion 301 and rotating therewith, and a driving slider 7 provided on the first connecting portion 101 and capable of cooperating with the reversing limit member 8, and the driving slider 7 has a first limit position and a second limit position on its sliding path. When the push rod frame 100 is in the unfolded state, when the push rod frame 30 is between the forward working position and the reverse working position, the reversing limit member 8 cooperates with the driving slider 7, and when the push rod frame 30 rotates, the reversing limit member 8 drives the driving slider 7 to slide between the first limit position and the second limit position; when the push rod frame 30 is in the forward working position, the driving slider 7 is in the first limit position, as shown in FIG. Fig.28 When the push rod frame 30 is in the reverse working position, the drive slider 7 is in the second limit position, such as Fig.32 This can effectively limit the rotation angle of the push rod frame 30 when changing direction to prevent it from being offside, thereby ensuring the comfort of the cart when pushing forward and backward.

[0094] See also Fig.18 ,19 As shown in Figure 29, two limit pin grooves 73 are provided on the driving slider 7, and limit pins (not shown in the figure) are respectively provided in the two limit pin grooves 73. The first connecting part 101 is also provided with two pin grooves corresponding to the first limit position and the second limit position. When the driving slider 7 slides on the first connecting part 101, it drives the limit pins to slide together. When the limit pin falls into the pin groove on the first connecting part 101 along a single direction, the driving slider 7 is limited at the corresponding position accordingly, thereby realizing the limitation of the push rod frame 30 when reversing.

[0095] The conversion of the driving slider 7 between the first limit position and the second limit position also realizes the automatic switching between the directional locking state and the directional unlocking state of the front wheel assembly 40 and the rear wheel assembly 50. Specifically, the two ends of the driving slider 7 are two driving ends 72 respectively matched with the front slider 401 and the rear slider 501. When the driving slider 7 slides between the first limit position and the second limit position, the two driving ends 72 of the driving slider 7 can respectively match with the rear slider 501 in the rear bracket 10 or the front slider 401 in the front bracket 20, so as to exert a downward force on the rear slider 501 or the front slider 401.

[0096] Here, see Figures 1 to 4 ,and Fig.26 , 28 , Fig.29 As shown, when the push rod frame 30 is in the forward working position, one of the driving ends 72 on the driving slider 7 abuts against the rear slider 501 to make it move downward, so that the rear orientation member 506 is cooperatively inserted into the rear orientation groove and the rear wheel orientation assembly is in a directional locked state. At this time, the other driving end 72 on the driving slider 7 is disengaged from the front slider 401, so that the front wheel orientation assembly is in a directional unlocked state, that is, when the push rod frame 30 is in the forward working position, the front wheel assembly 40 can turn freely, while the rear wheel assembly 50 is directionally locked and cannot turn.

[0097] On the contrary, see Figure 5 , 6 , 7 and Fig.33 , 36 As shown, when the push rod frame 30 is in the reverse working position, the other driving end 72 of the driving slider 7 abuts against the front slider 401 to make it move downward, so that the front orientation piece is cooperatively inserted into the front orientation groove and the front wheel orientation assembly is in a orientation locked state. At this time, the driving slider 7 is disengaged from the rear slider 501, so that the rear wheel orientation assembly is in a orientation unlocked state, that is, when the push rod frame 30 is in the reverse working position, the rear wheel assembly 50 can turn freely, while the front wheel assembly 40 is orientation locked and cannot turn.

[0098] When the push rod frame 30 is located at the middle position between the forward working position and the reverse working position, see Figure 8 , 9 As shown in FIGS. 30 and 32, the driving slider 7 is located between the first limit position and the second limit position, and the driving slider 7 is disengaged from the front slider 401 and the rear slider 501, respectively, so that the front wheel orientation assembly and the rear wheel orientation assembly are respectively in the orientation unlocking state, and the front wheel assembly 40 and the rear wheel assembly 50 are in the free steering state accordingly. In this way, when performing the reversing operation, when the push rod frame 30 is rotated to the middle position between the forward working position and the reverse working position, the front wheel assembly 40 and the rear wheel assembly 50 are both in the universal state, and the user can stand in place and rotate the cart frame 100 as a whole without having to go to the other side to achieve the reversing operation, which is more convenient for the user's daily reversing operation.

[0099] The rotating joint 200 is provided with a locking mechanism for mutually locking the base portion 301, the first connecting portion 101 and the second connecting portion 201, and the locking mechanism includes a first locking structure for mutually locking the base portion 301 and the first connecting portion 101, and a second locking structure for mutually locking the first connecting portion 101 and the second connecting portion 201. When the push rod frame 30 rotates between the forward working position and the reverse working position, the first locking structure is unlocked and the second locking structure remains locked, that is, the push rod frame 30 is kept in an unfolded and stable load-bearing state to perform the reversing operation of the push rod frame 30; and when the push rod frame 30 rotates from the forward working position to the rear support 10, and when the push rod frame 30 rotates from the reverse working position to the front support 10, the push rod frame 30 drives the second locking structure to unlock, thereby realizing the forward folding and reverse folding of the push rod frame 100.

[0100] The rotating joint 200 is also provided with a limit unlocking structure for driving the reversing limit member 8 to disengage from the driving slider 7. When the cart frame 100 is converted from the unfolded state to the folded state, that is, when the push rod frame 30 is rotated and retracted from the forward working position to the rear side of the rear bracket 10, and when the push rod frame 30 is rotated and retracted from the reverse working position to the front side of the front bracket 20, the above-mentioned limit unlocking structure drives the reversing limit member 8 to disengage from the driving slider 7, and the disengagement between the reversing limit member 8 and the driving slider 7 precedes the unlocking of the second lock structure.

[0101] Specifically, see Fig.18 , Fig.19 , Figure 26 to Figure 41As shown, the first locking structure includes a first locking toothed disc 1 slidably arranged between the base portion 301 and the first connecting portion 101 along the axis line extending direction of the rotating shaft 123, a first locking elastic member 2 for providing the first locking toothed disc 1 with the elastic force required for the sliding tendency of the first locking toothed disc 1 toward the base portion 301, a plurality of first locking teeth 1a are provided on the outer peripheral portion of the first locking toothed disc 1, a plurality of first locking grooves 30a matched with the plurality of first locking teeth 1a are provided on the base portion 301, and a plurality of first locking grooves 30a matched with the plurality of first locking teeth 1a are provided on the first connecting portion 101. a is matched with multiple second locking grooves 10a, when the first locking structure is locked, the multiple first locking teeth 1a are matched with the multiple first locking grooves 30a and the second locking grooves 10a at the same time, that is, the two ends of the multiple first locking teeth 1a are respectively embedded in the multiple first locking grooves 30a and the second locking grooves 10a, so that the push rod frame 30 is locked relative to the rear bracket 10; and when the first locking structure is unlocked, the multiple first locking teeth 1a are disengaged from the multiple first locking grooves 30a, and at this time the push rod frame 30 can rotate around the rotating shaft 123 relative to the rear bracket 10.

[0102] The second locking structure includes a second locking toothed disc 4 slidably arranged between the first connecting part 101 and the second connecting part 201 along the extension direction of the axial centerline of the rotating shaft 123, and a second locking elastic member 5 for providing the elastic force required for the sliding tendency of the second locking toothed disc 4 toward the first connecting part 101. The outer peripheral portion of the second locking toothed disc 4 is provided with a plurality of second locking teeth 41, the first connecting part 101 is provided with a plurality of third locking grooves 10b matched with the plurality of second locking teeth 41, and the second connecting part 201 is provided with a plurality of fourth locking grooves 20a matched with the second locking teeth 41. When the second locking structure is locked, the second locking teeth 41 are matched with the plurality of third locking grooves 10b and the fourth locking grooves 20a at the same time, so that the front bracket 20 and the rear bracket 10 are relatively locked; when the second locking structure is unlocked, the plurality of second locking teeth 41 are disengaged from the plurality of third locking grooves 10b, so that the front bracket 20 and the rear bracket 10 can rotate relative to each other.

[0103] See also Fig.18 , Fig.19 As shown, the rotary joint 200 is provided with a first unlocking driving member 3 and a second unlocking driving member 6. The first unlocking driving member 3 is slidable along the axis of the rotating shaft 123 and is rotatably arranged on the base portion 301 around the axis of the rotating shaft 123. The first locking toothed disc 1 abuts against the first unlocking driving member 3. The rotary joint 200 is also provided with an unlocking slider 9 for driving the first unlocking driving member 3 to slide. The unlocking slider 9 is slidably arranged on the base portion 301. The sliding direction of the unlocking slider 9 is perpendicular to the axis of the rotating shaft 123. Fig.18 , 19As shown in Figures 20 and 23, the unlocking slider 9 is provided with a first unlocking inclined surface 91, and the first unlocking driving member 3 is provided with a second unlocking inclined surface 33 which cooperates with the first unlocking inclined surface 91. When the unlocking slider 9 moves, the first unlocking inclined surface 91 cooperates with the second unlocking inclined surface 33 to drive the first unlocking driving member 3 to slide along the axis of the rotating shaft 123, thereby driving the first locking sprocket 1 to overcome the elastic force of the first lock elastic member 2 and move away from the base portion 301 to realize the unlocking of the first lock structure.

[0104] The second unlocking driving member 6 is arranged on the first connecting portion 101 so as to slide along the axis of the rotating shaft 123 and to be rotatable around the axis of the rotating shaft 123. The second locking toothed disc 4 abuts against the second unlocking driving member 6. The second unlocking driving member 6 is provided with at least one unlocking protrusion 61, which is provided here with two unlocking protrusions 61 distributed at 180° intervals. Fig.21 , 22 As shown in Figures 35, the first unlocking driving member 3 is provided with a sliding fitting portion 31 and a guiding inclined surface 32 that are slidably fitted with the unlocking protrusion 61 on the side facing the first connecting portion 101. Accordingly, the sliding fitting portion 31 and the guiding inclined surface 32 are also provided in two groups. When the second lock structure is in the unlocking state, the unlocking protrusion 61 is located in the corresponding sliding fitting portion 31; when the unlocking protrusion 61 slides from the sliding fitting portion 31 to the guiding inclined surface 32, the second unlocking driving member 6 slides and drives the second locking toothed disc 4 to move away from the first connecting portion 101, thereby unlocking the second lock structure.

[0105] See also Fig.18 , Fig.19 As shown, the above-mentioned limit unlocking structure for driving the reversing limit member 8 to disengage from the driving slider 7 is arranged between the unlocking slider 9 and the reversing limit member 8, and the reversing limit member 8 is driven to disengage from the driving slider 7 by sliding of the unlocking slider 9.

[0106] Specifically, see the accompanying drawings, especially Fig.18 , 19 and Fig.23 As shown, the reversing limit member 8 is slidably arranged on the base portion 301 along a direction parallel to the axial center line of the rotating shaft 123, and a limit protrusion 81 is provided on the end of the reversing limit member 8 facing the driving slider 7. The driving slider 7 has a guide groove 71 for the limit protrusion 81 to be slidably inserted, and the limit protrusion 81 can be inserted in the guide groove 71 and can slide along the guide groove 71. When the push rod frame 30 rotates, when the limit protrusion 81 abuts against the side groove wall of the guide groove 71, it drives the driving slider 7 to continue rotating until the driving slider 7 reaches the first limit position or the second limit position.

[0107] The above-mentioned limit unlocking structure includes a driving inclined surface 93 provided on the unlocking slider 9 and a matching inclined surface 82 provided on the reversing limit member 8. When the unlocking slider 9 moves along its sliding direction and the first lock structure is unlocked and continues to slide, the driving inclined surface 93 cooperates with the matching inclined surface 82 to drive the reversing limit member 8 to move away from the driving slider 7, so that the limiting protrusion 81 on the driving slider 7 is disengaged from the guide slot 71. At this time, the push rod frame 30 is rotated again, and the reversing limit member 8 no longer drives the driving slider 7 to slide. The folding unlocking operation is used for the push rod frame 30 to pass the forward working position to reach the rear side of the rear bracket 10 when the cart frame 100 is folded forward, or for the push rod frame 30 to pass the reverse working position to reach the front side of the front bracket 20 when the cart frame is folded reversely.

[0108] See also Fig.28 , 32 , 36, 39, and 41, the second connecting portion 201 is further provided with a front convex portion 201a, and the first connecting portion 301 is correspondingly provided with a rear convex portion (not shown in the figure). When the cart frame 100 is folded, during the relative rotation and approach between the front bracket 20 and the rear bracket 10, the front convex portion 201a gradually presses against the rear slider 501 to make the rear slider 501 move downward along the rear bracket 10, and at the same time, the rear convex portion gradually presses against the front slider 401 to make the front slider 401 move downward along the front bracket 20, respectively making the rear wheel orientation assembly and the front wheel orientation assembly at the same time. In the directional locking state, when the cart frame 100 is folded, the front wheel assembly 40 and the rear wheel assembly 50 are respectively directionally locked and cannot be turned, and the cart frame 100 relies on the front wheel assembly 40 and the rear wheel assembly 50 to stand on the ground. At the same time, when the front wheel assembly 40 and the rear wheel assembly 50 are in any universal state, the front and rear wheel assemblies will swing in the set direction when locked, and after the cart frame 100 is folded, the wheel bodies of the front wheel assembly 40 and the rear wheel assembly 50 will extend in the front and rear directions, so that the folded frame is more beautiful and flat.

[0109] In the child stroller, the front bracket 20 and the rear bracket 10 of the stroller frame 100 can be differently set in width along the left-right direction of the stroller frame, so that when the front bracket 20 and the rear bracket 10 are folded and retracted, one can be located between the other in the left-right direction, thereby reducing the size of the folded child stroller.

[0110] In summary, when the stroller frame 100 of the child stroller is in the unfolded state, the push rod frame 30 has a forward working position and a reverse working position, so that the child stroller can be pushed forward and pushed backward. The push rod frame 30 is easy to operate during the reversal operation, and when the push rod frame 30 is reversed, the front wheel assembly 40 and the rear wheel assembly 50 can be automatically switched between the directional locking state and the directional unlocking state, so that the wheel assembly located at the front side of the pushing direction is always in a universal state and the wheel assembly located at the rear side of the pushing direction is in a directional state to meet the needs of pushing the stroller. The stroller frame 100 of the child stroller has a forward folding position and a reverse folding position when folded. In this way, no matter whether the push rod frame is in the forward working position or the reverse working position, the push rod frame can be flipped toward the user's side to fold the stroller frame, which is convenient for the user's operation.

[0111] The stroller frame 100 can be used with the seat frame 300 when in the unfolded state. The seat frame 300 has a plurality of convertible working states on the stroller frame 100, and the adjustment of the working state of the seat frame 300 is independent of the reversing operation of the push rod frame 30. The seat frame 300 can be folded to one side of the stroller frame 100 when the stroller frame 100 is folded, so that the stroller with the seat can be folded.

[0112] When the stroller frame 100 is folded, the unlocking operation member only needs to be operated to drive the unlocking slider 9 to slide, so that the push rod frame 30 can be unlocked. After the push rod frame 30 is unlocked, it continues to rotate to automatically drive the front bracket 20 and the rear bracket 10 to be unlocked. Then, the stroller frame 100 is lifted as a whole, so that the front bracket 20 and the rear bracket 10 can be automatically rotated relative to each other to achieve the folding of the stroller frame 100, and at the same time, the front wheel assembly 40 and the rear wheel assembly 50 are automatically converted to a directional locking state. The structure of the folded child stroller is very compact, occupies less space, and is convenient to carry and store.

[0113] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A stroller for children, comprising a stroller frame with an unfolded state and a folded state, the stroller frame comprising a push rod frame, a front bracket and a rear bracket, a front wheel assembly is provided at the bottom of the front bracket, a rear wheel assembly is provided at the bottom of the rear bracket, an upper end portion of the front bracket, an upper end portion of the rear bracket and a lower end portion of the push rod frame are rotatably connected to each other through a rotating joint, when the stroller frame is in the unfolded state, the push rod frame has a forward working position extending upward from the front to the rear and a reverse working position extending upward from the rear to the front in its rotation stroke, characterized in that: When the cart frame is in the unfolded state, the push rod frame also has an intermediate position between the forward working position and the reverse working position in its rotation stroke. When the push rod frame is in the intermediate position, the front wheel assembly and the rear wheel assembly are both in a free steering state. When the cart frame is in the folded state, the cart frame has a forward folding position in which the push rod frame is folded to the rear side of the rear bracket and a reverse folding position in which the push rod frame is folded to the front side of the front bracket, wherein: The lower end of the push rod frame is rotationally connected to the upper end of the rear bracket around a first rotation center line, and the upper end of the rear bracket is rotationally connected to the upper end of the front bracket around a second rotation center line, the first rotation center line and the second rotation center line extend parallel to or colinearly with each other, and the rotation joint is provided with a first locking structure for locking the push rod frame and the rear bracket to each other, and a second locking structure for locking the front bracket and the rear bracket, when the push rod frame rotates between the forward working position and the reverse working position, the first locking structure is unlocked and the second locking structure remains locked; when the push rod frame rotates from the forward working position to the rear bracket, and when the push rod frame rotates from the reverse working position to the front bracket, the push rod frame drives the second locking structure to unlock; The rotating joint is provided with a push rod limit assembly, and the push rod limit assembly includes a reversing limit piece arranged on the push rod frame and rotating therewith, and a driving slider arranged on the front bracket or the rear bracket and capable of cooperating with the reversing limit piece, and the driving slider has a first limit position and a second limit position on its sliding path, and when the push rod frame is between the forward working position and the reverse working position, the reversing limit piece cooperates with the driving slider and drives the driving slider to slide when the push rod frame rotates; when the push rod frame is in the forward working position, the driving slider is in the first limit position; when the push rod frame is in the reverse working position, the driving slider is in the second limit position. When the push rod frame is rotated and retracted from the forward working position to the rear side of the rear bracket, and when the push rod frame is rotated and retracted from the reverse working position to the front side of the front bracket, the reversing limiter and the driving slider are disengaged. The front wheel assembly comprises a front wheel joint rotatably connected to the front bracket around a front steering axis, a front wheel orientation assembly is arranged between the front bracket and the front wheel joint, the rear wheel assembly comprises a rear wheel joint rotatably connected to the rear bracket around a rear steering axis, a rear wheel orientation assembly is arranged between the rear bracket and the rear wheel joint, the front wheel orientation assembly and the rear wheel orientation assembly respectively have a freely steerable orientation unlocking state and a steering locked orientation locking state, When the push rod frame is in the forward working position, the driving slider cooperates with the rear wheel orientation assembly to put it in a orientation locking state, at which time the rear wheel assembly cannot be turned but can only rotate forward in a single direction, and the front wheel orientation assembly is disengaged from the driving slider and is in a orientation unlocking state; when the push rod frame is in the reverse working position, the driving slider cooperates with the front wheel orientation assembly to put it in a orientation locking state, at which time the front wheel assembly cannot be turned but can only rotate forward in a single direction, and the rear wheel orientation assembly is disengaged from the driving slider and is in a orientation unlocking state. The front wheel orientation assembly comprises a front orientation piece disposed at the bottom of the front bracket and capable of moving toward or away from the front wheel joint, a front orientation elastic piece for providing a movement tendency of the front orientation piece toward the front wheel joint, a front slider disposed on the front bracket and capable of moving up and down along a length extension direction of the front bracket, a front locking elastic piece for providing an upward movement tendency of the front slider, and a front connecting piece connected between the front orientation piece and the front slider, wherein the front wheel joint is provided with a front orientation slot for the front orientation piece to be cooperatively inserted into. The rear wheel orientation assembly comprises a rear orientation piece disposed at the bottom of the rear bracket and capable of moving toward or away from the rear wheel joint, a rear orientation elastic piece for providing a movement tendency of the rear orientation piece toward the rear wheel joint, a rear slider disposed on the rear bracket and capable of moving up and down along the length extension direction of the rear bracket, a rear locking elastic piece for providing an upward movement tendency of the rear slider, and a rear connecting piece connected between the rear orientation piece and the rear slider, wherein the rear wheel joint is provided with a rear orientation slot for the rear orientation piece to be cooperatively inserted; The child stroller also includes a foldable seat frame, which is installed on the stroller frame through a seat bracket. When the stroller is in a forward folding position and a reverse folding position, the seat frame is folded at the front side of the front bracket.

2. The baby stroller according to claim 1, characterized in that: The rotating joint is also provided with a limit unlocking structure for driving the reversing limit member to disengage from the driving slider. When the cart frame is converted from an unfolded state to a folded state, the disengagement between the reversing limit member and the driving slider precedes the unlocking of the second lock structure.

3. The stroller according to claim 2, characterized in that: The rotating joint is provided with an unlocking member for unlocking the first locking structure. The limit unlocking structure is arranged between the unlocking member and the reversing limit member, and drives the reversing limit member to separate from the driving slider when the unlocking member moves.

4. The stroller according to claim 3, characterized in that: The reversing limit member is slidably arranged on the push rod frame in a direction parallel to the first rotation center line. A limit protrusion is provided on the end of the reversing limit member facing the driving slider. The driving slider has a guide groove for the limit protrusion to be slidably inserted. The limit protrusion can be inserted in the guide groove and can slide along the guide groove.

5. The stroller according to claim 4, characterized in that: The unlocking member includes an unlocking slider slidably arranged on the push rod frame, the sliding direction of the unlocking slider is perpendicular to the first rotation center line, a driving inclined surface is provided on the unlocking slider, and a matching inclined surface is provided on the reversing limit member. When the unlocking slider moves along its sliding direction and the first lock structure is unlocked and continues to slide, the driving inclined surface cooperates with the matching inclined surface and drives the reversing limit member to move away from the driving slider.

6. The stroller according to claim 1, characterized in that: When the cart frame is in a folded state, the front bracket and the rear bracket are close to each other, and the rear wheel orientation assembly and the front wheel orientation assembly are both in a orientation locking state.

7. The stroller according to claim 1, characterized in that: When the cart frame is in the unfolded state and the push rod frame is located between the forward working position and the reverse working position, the front wheel orientation assembly and the rear wheel orientation assembly are respectively disengaged from the driving slider and are respectively in the orientation unlocking state.

8. The stroller according to claim 1, characterized in that: When the push rod frame is in the forward working position, the driving slider abuts against the rear slider to make it move downward, and the rear directing member is cooperatively inserted in the rear directing groove to make the rear wheel directing assembly in a directional locking state, and the driving slider is disengaged from the front slider; when the push rod frame is in the reverse working position, the driving slider abuts against the front slider to make it move downward, and the front directing member is cooperatively inserted in the front directing groove to make the front wheel directing assembly in a directional locking state, and the driving slider is disengaged from the rear slider.

9. The baby stroller according to claim 1, characterized in that: A front convex portion is provided on the upper end portion of the front bracket, and a rear convex portion is provided on the upper end portion of the rear bracket. When the cart frame is in a folded state, the front bracket and the rear bracket are brought close to each other, the front convex portion presses against the rear slider, and the rear convex portion presses against the front slider, so that the rear wheel orientation assembly and the front wheel orientation assembly are respectively in a orientation locking state.

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