Folding baby carriage

Abstract

A folding baby carriage, comprising a frame having an unfolded position and a folded position, and a plurality of wheel assemblies provided at the bottom of the frame. The frame includes a base, a bottom wheel frame sleeved with the base and capable of using its own center line as a turning axis, and a connecting rod rotatably arranged on the base around a first folding axis. The axis line of the first folding axis is spatially perpendicular to the axis line of the turning axis. The connecting rod has a connecting rod swing section, and the bottom wheel frame has a fixed upper limit part and a lower limit part. The connecting rod swing section is located between the upper limit part and the lower limit part. When the frame is being folded or unfolded, the connecting rod swing section abuts against the upper limit part or the lower limit part, driving the bottom wheel frame to rotate relative to the base, so as to achieve the effect that when the frame is unfolded, the wheel assemblies synchronously extend downward, and when the frame is folded, the wheel assemblies synchronously retract upward. The overall design structure is simple, the unfolding and folding operations are convenient, the volume after folding is small, and the manufacturing cost is low.

Description

Technical Field

[0001] The present invention belongs to the field of children's products, and particularly relates to a folding baby carriage. Background Art

[0002] A folding baby carriage generally includes a foldable frame, a wheel assembly installed at the lower part of the frame, a locking device capable of locking the state of the frame, and a human support device installed on the frame for infants to sit on, such as a seat pocket, a seat, a bassinet, etc. When unfolded, it can be used for infants and toddlers to sit on, and when pushed by an adult, it can be used as a means of transportation. When not in use, it can be folded to reduce its volume, facilitating storage or transportation.

[0003] As a folding baby carriage, being stable in the unfolded position, convenient to fold, and having a small volume after folding have always been the common pursuits. In the past, most frames only considered how to fold the frame reasonably so that the volume after folding is as small as possible. When the frame is folded, multiple wheel assemblies extending downward cannot be folded, and the volume is still large. In order to further reduce the volume of the frame after folding. Currently, some wheel assemblies of folding baby carriages can be unfolded or folded relative to the frame separately, but as a baby carriage, the overall folding or unfolding operation is rather troublesome. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a folding baby carriage.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: a folding baby carriage, including a frame having an unfolded position and a folded position, and a plurality of wheel assemblies provided at the bottom of the frame. When the frame is in the unfolded position, each wheel assembly extends downward from the frame respectively. When the frame is in the folded position, each wheel assembly folds relative to the frame respectively. The frame includes a base, a bottom wheel frame sleeved with the base and capable of using its own central axis as a rotation axis, and a connecting rod rotatably arranged on the base around a first folding axis. The axis of the first folding axis is spatially perpendicular to the axis of the rotation axis. The connecting rod has a connecting rod swing section. The bottom wheel frame has a fixed upper limit portion and a lower limit portion. The connecting rod swing section is located between the upper limit portion and the lower limit portion. At least one of the wheel assemblies is installed on the bottom wheel frame. When the frame is converted to the unfolded position or the folded position, the connecting rod rotates around the first folding axis relative to the base, and the connecting rod swing section abuts against the lower limit portion or hooks on the upper limit portion to cause the bottom wheel frame to rotate relative to the base.

[0006] In some embodiments, a rotation limiting structure for restricting the rotation angle range between the bottom wheel frame and the base is provided. When the frame is in the unfolded position, the connecting rod swing section abuts against the lower limit portion.

[0007] In some embodiments, when the frame is in the folded position, the link swing section hooks or presses against the upper limit portion.

[0008] In some embodiments, an open activity space is formed between the upper limit portion and the lower limit portion. The link swing section is provided with a control driving portion facilitating cooperation with the upper limit portion and the lower limit portion, and the control driving portion is located within the activity space.

[0009] In some embodiments, the wheel assembly includes a front wheel assembly and a rear wheel group. The front wheel assembly is disposed at the front end of the bottom wheel frame, and the rear wheel assembly is disposed at the rear end of the bottom wheel frame. The bottom wheel frame includes a bottom wheel shaft rod section and a rear wheel connection head fixed to the rear end of the bottom wheel shaft rod section. The rotation axis is the center line of the bottom wheel shaft rod section, and the rotation axis extends in the front-rear direction. The rear wheel assembly is disposed on the rear wheel connection head. The upper limit portion is disposed above the bottom wheel shaft rod section or the rear wheel connection head, and the lower limit portion is disposed on the rear wheel connection head.

[0010] In some embodiments, the frame includes side brackets located on the left and right sides and a human body support mechanism disposed between the left and right side brackets. Each side bracket includes the bottom wheel frame and further includes a front support frame whose lower end is pivotally connected to the base around the second folding axis. The bottom wheel frame further includes a front wheel connection head fixed to the front end of the bottom wheel shaft rod section. The front wheel assembly is disposed on the front wheel connection head. An unfolding anti-rotation mechanism for locking or unlocking the lower part of the front support frame and the front wheel connection head is provided therebetween.

[0011] In some embodiments, the side bracket further includes the link, a push rod frame and an outer sliding sleeve respectively slidably disposed on the front support frame. The upper end of the link is pivotally connected to the lower part of the outer sliding sleeve around the third folding axis. The first folding axis, the second folding axis and the third folding axis respectively extend in the left-right direction and are parallel to each other.

[0012] In some embodiments, the side bracket further includes a push rod frame slidably disposed on the front support frame. A push rod locking mechanism is provided between the front support frame and the push rod frame, and a sliding sleeve locking mechanism is provided between the front support frame and the outer sliding sleeve.

[0013] In some embodiments, the lower end of the push rod frame has a push rod triggering portion that sequentially triggers the unlocking of the sliding sleeve locking mechanism and the unfolding anti-rotation mechanism when sliding downward.

[0014] In some embodiments, the base includes a bottom front pedal extending in the left - right direction at the front, and two bottom mounting parts that are respectively symmetric left - and - right and located at the rear. Each bottom wheel carrier can only be rotatably inserted into the corresponding bottom mounting part and the corresponding side part of the bottom front pedal. Each bottom mounting part has a rotation plane for the connecting rod to rotate. The first folding axis is located on the bottom mounting part and is perpendicular to the rotation plane. The second folding axis is located on the bottom front pedal. The swing segments of the connecting rods on the left and right sides are fixedly connected by a cross - connecting rod to form a rigid whole. When the frame is converted to the unfolded position or the folded position, the swing segments of the connecting rods on the left and right sides synchronously control the left and right front wheel assemblies and the left and right rear wheel assemblies to synchronously extend downward or synchronously move closer to the middle.

[0015] The scope of the present invention is not limited to the technical solutions formed by the specific combination of the above - mentioned technical features, but should also cover other technical solutions formed by any combination of the above - mentioned technical features or their equivalent features. For example, technical solutions formed by mutually replacing the above - mentioned features with (but not limited to) technical features with similar functions disclosed in the present application, etc.

[0016] Due to the application of the above - mentioned technical solutions, the present invention has the following advantages compared with the prior art: This folding baby carriage mainly utilizes the bottom wheel carrier, the base and the connecting rod in the frame. The bottom wheel carrier equipped with the wheel assembly is sleeved with the base and can be rotatably arranged. The connecting rod is rotatably connected to the base. The swing segment of the connecting rod is located between the upper limit part and the lower limit part. When the frame is folded or unfolded, the swing segment of the connecting rod changes the angle relative to the base. By abutting against the upper limit part or the lower limit part, it drives the bottom wheel carrier to rotate relative to the base, so that when the frame is unfolded, the wheel assembly synchronously extends downward, and when the frame is folded, the wheel assembly synchronously retracts upward. The overall design structure is simple, the unfolding and folding operations are convenient, the volume after folding is small, and the manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Appendix Figure 1 is a three - dimensional schematic diagram of the unfolded folding baby carriage frame Figure 1 ;

[0018] Appendix Figure 2 is a side schematic diagram of the unfolded folding baby carriage frame;

[0019] Appendix Figure 3 is a three - dimensional schematic diagram of the unfolded folding baby carriage frame Figure 2 ;

[0020] Appendix Figure 4 is a three - dimensional schematic diagram after the push rod frame descends Figure 1 ;

[0021] Appendix Figure 5 is a three - dimensional schematic diagram after the push rod frame descends Figure 2 ;

[0022] Attached Figure 6 is the state during the folding process of the frame Figure 1 ;

[0023] Attached Figure 7 is the state during the folding process of the frame Figure 2 ;

[0024] Attached Figure 8 is a three - dimensional schematic diagram of the folding of the folding baby carriage frame;

[0025] Attached Figure 9 is a partial structural schematic diagram of the rear wheel assembly installed on the bottom wheel frame;

[0026] Wherein: 1. Frame; 2. Front wheel assembly; 3. Rear wheel assembly;

[0027] 10. Base; 101. Bottom front pedal; 102. Bottom mounting part;

[0028] 11. Bottom wheel frame; 11a. Upper limit part; 11b. Lower limit part; 111. Bottom wheel shaft rod section; 112. Front wheel connection head; 113. Rear wheel connection head;

[0029] 12. Link; 121. Link swing section;

[0030] 13. Front support frame; 14. Push rod frame; 15. Outer sliding sleeve; 16. Deployment anti - rotation mechanism;

[0031] X1. Folding axis 1; X2. Folding axis 2; X3. Folding axis 3; X4. Rotation axis. Specific embodiments

[0032] The folding baby carriage generally includes a frame 1 having a deployed position and a folded position, and a plurality of wheel assemblies provided at the bottom of the frame 1. The wheel assemblies are divided into a front wheel assembly and a rear wheel assembly according to the front - rear position. The front wheel assembly usually uses a universal wheel. When the frame 1 is in the deployed position, for a child to sit on, each wheel assembly extends downward from the frame 1 respectively and can roll on the ground. When the frame 1 is in the folded position, each wheel assembly automatically folds with the folding of the frame, that is, it automatically folds relative to the frame 1 respectively, with a small volume for easy storage and handling.

[0033] In this embodiment, as attached Figures 1-8 shown, the frame 1 includes a base 10, side brackets formed on the base 10 and located on the left and right sides, and a human body support mechanism provided between the left and right side brackets. The base 10 can be a whole surrounding frame body, but in order to save materials, in this embodiment, the base 10 is divided into three parts. The base 10 includes a bottom front pedal 101 extending in the left - right direction at the front part, and two bottom mounting parts 102 that are symmetric left and right and located at the rear.

[0034] The side bracket on each side includes a bottom wheel frame 11 which is rotatably arranged in the base 10 (one side of the bottom front pedal 101, the bottom mounting portion 102 on the corresponding side) and takes its own center line as the flip axis X4, a connecting rod 12 which is rotatably arranged on the base 10 around a folding axis X1, a front support frame 13 whose lower end is pivotally connected to the base 10 around a folding axis X2, a push rod frame 14 which is slidably inserted in the front support frame 13, and an outer sliding sleeve 15 which is slidably sleeved on the outside of the front support frame 13.

[0035] The upper end of the connecting rod 12 is pivotally connected to the lower part of the outer sliding sleeve 15 around the folding three-axis X3. The folding axis X1, the folding axis X2, and the folding axis X3 extend in the left and right directions and are parallel. The length of the bottom wheel frame 11 is set along the front-to-back direction, the turning axis X4 extends in the front-to-back direction, and the axis center line of the folding axis X1 is perpendicular to the axis center line of the turning axis X4 in space. The front part of the bottom wheel frame 11 is installed with a front wheel assembly 2, and the rear part is installed with a rear wheel assembly 3.

[0036] A push rod locking mechanism is provided between the front support frame 13 and the push rod frame 14, and the push rod locking mechanism that locks the sliding push rod frame 14 is used to adjust the height and lock the push rod frame in the unfolded position, and unlock the push rod frame 14 to retract when the frame needs to be folded, etc. The push rod locking mechanism is a common structure and will not be described in detail.

[0037] A sliding sleeve locking mechanism is provided between the front support frame 13 and the outer sliding sleeve 15. The sliding sleeve locking mechanism is not the invention point. Any locking mechanism between sliding relations can be applied, such as a spring pin or spring hook provided on the outer sliding sleeve 15, which automatically springs into the lock hole of the front support frame when unfolded. When the push rod frame 14 slides downward to a certain position, it pushes the spring pin or spring hook and pushes it outward, thereby unlocking the sliding sleeve locking mechanism and folding the frame. Of course, a button can also be provided for separate control without using the push rod frame 14.

[0038] As attached Figures 1-9 As shown, the connecting rod 12 has a connecting rod swing section 121, and the bottom wheel frame 11 has a fixed upper limit portion 11a and a lower limit portion 11b, and the connecting rod swing section 121 is located between the upper limit portion 11a and the lower limit portion 11b. Figures 6-8 As shown, when the frame 1 is converted from the unfolded position to the folded position, the outer sliding sleeve 15 slides downward along the front support frame 13, so that the connecting rod 12 rotates around the folding axis X1 relative to the bottom mounting portion 102 of the base 10, and the connecting rod swing section 121 tilts upward and abuts against the upper limit portion 11a, hooking it upward, causing the bottom wheel frame 11 to rotate around the flip axis X4 relative to the base 10, and the wheel assembly is retracted upward.

[0039] A rotation limiting structure for restricting the rotation angle range between the bottom wheel frame 11 and the base 10 is provided. The rotation limiting structure is not an inventive point. For example, a positioning pin is provided on the bottom wheel frame 11, and an arc-shaped groove is opened on the base 10, etc. The arc angle of the arc-shaped groove limits the rotation range of the bottom wheel frame around the turning axis X4, such as 85° - 95°. When the vehicle frame 1 is in the unfolded position, the bottom wheel frame rotates downward relative to the base 10 to the limit position, and at this time the wheel is perpendicular to the horizontal plane, as shown in the attached Figure 3 and the attached Figure 9 figures. At this time, when the connecting rod swing section 121 presses against the lower limit portion 11b, the position of the bottom wheel frame is locked.

[0040] An open activity space is formed between the upper limit portion 11a and the lower limit portion 11b. The connecting rod swing section 121 has a control driving portion that is convenient for cooperating with the upper limit portion 11a and the lower limit portion 11b, and the control driving portion is located in the activity space. This activity space can compensate for the movement distance of the connecting rod 12.

[0041] Regarding the detailed structure of the wheel assembly, the wheel assembly includes a front wheel assembly 2 and a rear wheel assembly 3. The front wheel assembly 2 is arranged at the front end of the bottom wheel frame 11, and the rear wheel assembly 3 is arranged at the rear end of the bottom wheel frame 11. As shown in the attached Figure 2 and 3 figures, the bottom wheel frame 11 includes a bottom wheel shaft rod section 111, a rear wheel connection head 113 fixed to the rear end of the bottom wheel shaft rod section 111, and a front wheel connection head 112 fixed to the front end of the bottom wheel shaft rod section 111. The turning axis X4 is the center line of the bottom wheel shaft rod section 111. The rear wheel assembly 3 is arranged on the rear wheel connection head 113, and the front wheel assembly 2 is arranged on the front wheel connection head 112. The upper limit portion 11a and the lower limit portion 11b are both arranged on the rear wheel connection head 113, which is convenient for being integrally manufactured by mold opening. Or, in order to meet the folding principle of other ways of the vehicle frame, the upper limit portion and the lower limit portion can also be arranged on the front wheel connection head.

[0042] As shown in the attached Figure 1 figures, an unfolding anti-rotation mechanism 16 for locking or unlocking is provided between the lower part of the front support frame 13 and the front wheel connection head 112. The function of the unfolding anti-rotation mechanism 16 is to make the state of the vehicle frame 1 more stable in the unfolded position. The structure is as follows: a movable spring tongue with a protruding position and a retracted position is rotatably or slidably arranged at the lower part of the front support frame 13, and an anti-rotation lock hole is opened on the front wheel connection head 112. When the vehicle frame 1 is in the unfolded position, the movable spring tongue automatically inserts into the anti-rotation lock hole. When the push rod frame 14 descends to the bottom, it presses on the movable spring tongue to make it withdraw from the anti-rotation lock hole, and the vehicle frame can be folded in the order of the attached Figures 6-8 state. Of course, a button switch for the movable spring tongue can also be set separately.

[0043] Each bottom wheel frame 11 can only be rotatably inserted into the corresponding bottom mounting portion 102 and the corresponding side portion of the bottom front pedal 101. Each bottom mounting portion 102 has a rotation plane for the connecting rod 12 to rotate. The first folding axis X1 is located on the bottom mounting portion 102 and is perpendicular to the rotation plane. The second folding axis X2 is located on the bottom front pedal 101. The left and right side connecting rod swing segments 121 are fixedly connected by connecting rod cross sections to form a rigid whole. When the frame 1 is converted to the unfolded position or the folded position, the left and right side connecting rod swing segments 121 synchronously control the left and right front wheel assemblies 2 and the left and right rear wheel assemblies 3 to synchronously extend downward or synchronously move toward the middle and extend to each other. The frame is folded in one go and has a compact size after folding.

[0044] In the folding process of this embodiment: the unlocked push rod frame 14 moves downward, the sliding sleeve locking mechanism is unlocked, and the sliding sleeve 15 also moves downward. The push rod frame 14 moves downward to unlock the unfolding anti-rotation mechanism 16. During the downward movement of the sliding sleeve 15, the connecting rod 12 is driven to rotate around the folding axis X1. The connecting rod swing section 121 tilts upward and abuts against the upper limit portion 11a, and hooks it upward, prompting the bottom wheel frame 11 to rotate relative to the base 10 around the flip axis X4, and the wheel assembly is retracted upward. When unfolding, the push rod frame 14, the front support frame 13, etc. are lifted upward, and then the push rod frame 14 is pulled upward, and the frame is unfolded synchronously.

[0045] 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 folding baby carriage, comprising a carriage frame (1) having an unfolded position and a folded position, and a plurality of wheel assemblies disposed at the bottom of the carriage frame (1). The front wheel assembly is a universal wheel. When the carriage frame (1) is in the unfolded position, each of the wheel assemblies extends downward from the carriage frame (1). When the carriage frame (1) is in the folded position, each of the wheel assemblies is folded relative to the carriage frame (1). It is characterized in that: The frame (1) includes a base (10), a bottom wheel frame (11) sleeved with the base (10) and capable of using its own central axis as a turning axis (X4), and a connecting rod (12) rotatably arranged on the base (10) around a first folding axis (X1). The axis line of the first folding axis (X1) is spatially perpendicular to the axis line of the turning axis (X4). The connecting rod (12) has a connecting rod swing section (121). The bottom wheel frame (11) has a fixed upper limit part (11a) and a lower limit part (11b). The connecting rod swing section (121) is located between the upper limit part (11a) and the lower limit part (11b). At least one of the wheel assemblies is installed on the bottom wheel frame (11). When the frame (1) is converted to the unfolded position or the folded position, the connecting rod (12) rotates around the first folding axis (X1) relative to the base (10), and the connecting rod swing section (121) abuts against the lower limit part (11b) or hooks on the upper limit part (11a) to cause the bottom wheel frame (11) to rotate relative to the base (10).

2. The folding baby carriage according to claim 1, wherein: A rotation limiting structure for restricting the rotation angle range between the bottom wheel frame (11) and the base (10) is provided. When the frame (1) is in the unfolded position, the connecting rod swing section (121) abuts against the lower limit part (11b).

3. The folding baby carriage according to claim 2, wherein: When the frame (1) is in the folded position, the connecting rod swing section (121) hooks on or abuts against the upper limit part (11a).

4. The folding baby carriage according to claim 1, characterized in that: An open activity space is formed between the upper limit part (11a) and the lower limit part (11b). The connecting rod swing section (121) has a control driving part for facilitating cooperation with the upper limit part (11a) and the lower limit part (11b), and the control driving part is located in the activity space.

5. The folding baby carriage according to any one of claims 1-4, characterized in that: The wheel assembly includes the front wheel assembly (2) and the rear wheel assembly (3). The front wheel assembly (2) is arranged at the front end of the bottom wheel frame (11), and the rear wheel assembly (3) is arranged at the rear end of the bottom wheel frame (11). The bottom wheel frame (11) includes a bottom wheel shaft rod section (111) and a rear wheel connection head (113) fixed to the rear end of the bottom wheel shaft rod section (111). The turning axis (X4) is the central axis of the bottom wheel shaft rod section (111), and the turning axis (X4) extends in the front-rear direction. The rear wheel assembly (3) is arranged on the rear wheel connection head (113). The upper limit part (11a) is arranged on the upper part of the bottom wheel shaft rod section (111) or the rear wheel connection head (113), and the lower limit part (11b) is arranged on the rear wheel connection head (113).

6. The folding baby carriage according to claim 5, wherein: The frame (1) includes side brackets located on the left and right sides, and a human support mechanism disposed between the left and right side brackets. Each side bracket includes the bottom wheel frame (11), and further includes a front support frame (13) whose lower end is pivotally connected to the base (10) about the folding second axis (X2). The bottom wheel frame (11) further includes a front wheel joint head (112) fixed to the front end of the bottom wheel shaft rod section (111). The front wheel assembly (2) is disposed on the front wheel joint head (112). An unfolding anti-rotation mechanism (16) for locking or unlocking the lower part of the front support frame (13) and the front wheel joint head (112) is provided therebetween.

7. The folding baby carriage according to claim 6, characterized in that: The side bracket further includes the connecting rod (12) and an outer sliding sleeve (15) slidably disposed on the front support frame (13). The upper end of the connecting rod (12) is pivotally connected to the lower part of the outer sliding sleeve (15) about the folding third axis (X3). The folding first axis (X1), the folding second axis (X2), and the folding third axis (X3) respectively extend in the left-right direction and are parallel to each other.

8. The folding baby carriage according to claim 7, wherein: The side bracket further includes a push rod frame (14) slidably disposed on the front support frame (13). A push rod locking mechanism is provided between the front support frame (13) and the push rod frame (14), and a sliding sleeve locking mechanism is provided between the front support frame (13) and the outer sliding sleeve (15).

9. The folding baby carriage according to claim 8, wherein: The lower end of the push rod frame (14) has a push rod trigger portion that sequentially triggers the unlocking of the sliding sleeve locking mechanism and the unfolding anti-rotation mechanism (16) when sliding downward.

10. The folding baby carriage according to claim 7, wherein: The base (10) includes a bottom front pedal (101) extending in the left-right direction at the front, and two bottom mounting portions (102) that are respectively symmetric left and right and located at the rear. Each bottom wheel frame (11) can only be rotatably inserted into the corresponding bottom mounting portion (102) and the corresponding side portion of the bottom front pedal (101). Each bottom mounting portion (102) has a rotation plane for the connecting rod (12) to rotate. The folding first axis (X1) is located on the bottom mounting portion (102) and is perpendicular to the rotation plane. The folding second axis (X2) is located on the bottom front pedal (101). The left and right side connecting rod swing segments (121) are fixedly connected by a connecting rod cross segment to form a rigid whole. When the frame (1) is converted to the unfolding position or the folding position, the left and right side connecting rod swing segments (121) synchronously control the left and right front wheel assemblies (2) and the left and right rear wheel assemblies (3) to synchronously extend downward or synchronously move closer to the middle.

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