Cart handle switching system and baby carriage

Abstract

The utility model discloses a cart handle switching system which comprises a chassis joint, a handle joint and a joint lock, the chassis joint and the handle joint are assembled to rotate relatively, the joint lock is provided with at least three rotating gears, and the joint lock is matched with the chassis joint and the handle joint at the same time. The chassis joint and the handle joint can rotate relatively and are locked at any rotating gear by the joint lock. On the basis, the utility model further provides a baby carriage which comprises a walking frame, a wheel assembly is arranged at the bottom of the walking frame, a pushing handle is connected to the upper portion of the walking frame, and the walking frame and the pushing handle are connected through the baby carriage pushing handle switching system. And the pushing handle rotates and is locked along with the handle joint. The push handle of the baby carriage has the advantages that the push handle of the baby carriage can be switched to be in a forward inclining state, a backward inclining state and a vertical accompanying state, daily push requirements are met, and meanwhile push convenience can be provided for accompanying of parents and infants.

Description

Technical Field

[0001] The utility model relates to a manual stroller, in particular to an accessory or component specially suitable for a children's stroller. Background Art

[0002] Strollers provide great convenience for infants and young children to travel, and have been recognized by many families. The basic structure of a stroller includes a frame, a wheel assembly, and a seat. The frame can be further divided into a walking frame at the bottom for mounting the wheel assembly, and a handle at the top for pushing. Most strollers have fixed handles, and the orientation relationship between the parent and the baby is also fixed. This is a single-orientation stroller.

[0003] Later, someone proposed a handle that can switch directions. This handle can be rotated to two states: forward tilt and backward tilt, so that the parent and the baby are facing the same or opposite directions to achieve different usage states. For a baby stroller, when the parent and the baby are facing the same direction, the forward direction of the parent and the baby is the front of the baby stroller, and the pushing direction of the baby stroller is the forward pushing direction. When the parent and the baby are facing opposite directions, the forward direction of the parent and the backward direction of the baby are the rear of the baby stroller, and the pushing direction of the baby stroller is the backward pushing direction.

[0004] Regardless of whether the handle is adjusted to the forward or backward state, the infant is always located in front of the parent, so that the infant cannot see the parent and the outside scenery in front at the same time. When the parent needs to walk with the infant (for example, visiting or explaining at the same time), the forward or backward tilted handle is inconvenient for the parent to push the infant. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a system that can switch the handle of the baby stroller to a forward tilting, backward tilting and vertical accompanying state. The main technical solutions adopted by this system are:

[0006] A cart handle switching system includes a chassis joint and a handle joint, wherein the chassis joint and the handle joint are assembled to be relatively rotatable, and the key points are:

[0007] It also includes a joint lock having at least three rotation gears. The joint lock cooperates with the chassis joint and the handle joint at the same time. The relative rotation relationship between the chassis joint and the handle joint is locked by the joint lock in any of the rotation gears.

[0008] The chassis joint and the handle joint are generally assembled on the central axis to achieve relative rotation; the function of the joint lock is to lock the rotatable relationship between the chassis joint and the handle joint; the at least three rotation gears configured by the joint lock are designed in different positions to achieve the purpose of adjusting the push handle of the baby stroller, wherein: one rotation gear is a forward push gear; one rotation gear is a backward push gear; one rotation gear is a companion push gear; and the companion push gear is located between the forward push gear and the backward push gear. The push handle can thus be limited to the companion push gear, which is convenient for parents to hold the push handle when they are parallel to the infant.

[0009] On this basis, the utility model also provides a baby stroller, including a walking frame, a wheel assembly is provided at the bottom of the walking frame, a pushing handle is connected to the upper part of the walking frame, and the walking frame and the pushing handle are connected through the above-mentioned stroller handle switching system, wherein:

[0010] The chassis joint is fixedly connected to the upper part of the traveling frame;

[0011] The handle joint is fixedly connected to the lower part of the pushing handle.

[0012] The pushing handle is locked along with the rotation of the handle joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an exploded view of the cart handle switching system in the first person perspective;

[0014] Figure 2 This is an exploded view of the cart handle switching system in the second perspective;

[0015] Figure 3 It is a schematic diagram of the state when the locking claw 41 is connected to the forward pushing gear;

[0016] Figure 4 It is a schematic diagram of the state when the locking claw 41 is connected to the accompanying pushing gear;

[0017] Figure 5 It is a schematic diagram of the state when the locking claw 41 is connected to the backward pushing gear;

[0018] Figure 6 It is a schematic diagram of the state after the locking claw 41 locks the chassis joint 1 and the handle joint 2;

[0019] Figure 7 It is a schematic diagram of the state after the locking claw 41 and the chassis joint 1 and the handle joint 2 are unlocked;

[0020] Figure 8 It is a schematic diagram of the cross-sectional structure after the cart handle switching system is connected to the pushing handle C;

[0021] Fig. 9 It is a schematic diagram of the cross-sectional structure of the wheel directional lock;

[0022] Fig.10 It is a schematic diagram of the structure of the baby carriage when the pushing handle C is in a backward tilted state;

[0023] Fig.11 It is a schematic diagram of the structure of the baby carriage when the pushing handle C is in a vertical accompanying state;

[0024] Fig.12 It is a schematic diagram of the structure of the baby carriage when the pushing handle C is in a forward tilted state. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with embodiments and drawings.

[0026] like Figure 1 and Figure 2 As shown, a cart handle switching system includes a chassis joint 1 and a handle joint 2, and the chassis joint 1 and the handle joint 2 are assembled to be relatively rotatable. Specifically, a relative rotation assembly structure of the chassis joint 1 and the handle joint 2 is: the system also includes a central axis 3, the chassis joint 1 and the handle joint 2 are mounted on the same central axis 3, and the chassis joint 1 and the handle joint 2 are also axially fixed on the central axis 3 to prevent axial movement; the chassis joint 1 and the handle joint 2 can rotate relative to each other on the central axis 3, and one end of the central axis 3 can be fixed to the handle joint 2.

[0027] "First perspective" and "second perspective" do not represent a specific fixed perspective, but are used to distinguish Figure 1 , Figure 2 Two different perspectives.

[0028] The system further comprises a joint lock 4, which has at least three rotation gears, and the joint lock 4 cooperates with the chassis joint 1 and the handle joint 2 at the same time, and the joint lock 4 is used to lock the relative rotation relationship between the chassis joint 1 and the handle joint 2, and the relative rotation relationship between the chassis joint 1 and the handle joint 2 is locked and maintained in any of the rotation gears by the joint lock 4. Preferably, the joint lock 4 is arranged between the chassis joint 1 and the handle joint 2.

[0029] Combination Figure 3 , 4 , 5 and Fig.10 , 11 It can be seen from 12 that when the push handle of the baby carriage is only required to have three states: forward tilt, backward tilt, and vertical accompanying, three rotation gears are provided on the chassis joint 1, wherein:

[0030] One rotation gear is the forward pushing gear, corresponding to Figure 3 ; At this time, the push handle is in the backward state, corresponding to Fig.10 ;

[0031] One rotation gear is the accompanying push gear, corresponding to Figure 4 ; At this time, the push handle is in the vertical accompanying state, corresponding to Fig.11 ;

[0032] One rotation gear is the backward push gear, corresponding to Figure 5 ; At this time, the push handle is in the forward leaning state, corresponding to Fig.12 .

[0033] The accompanying pushing gear is located between the forward pushing gear and the reverse pushing gear.

[0034] The joint lock 4 has a variety of selectable existing technologies. The structure of a joint lock 4 provided in this embodiment is as follows: the joint lock 4 includes a locking claw 41, an unlocking assembly 42, a synchronizing member 43, and a claw connection gear 44;

[0035] The handle joint 2 is fixedly provided with the synchronizer 43, and the chassis joint 1 is provided with at least three claw connection gears 44, and the claw connection gears 44 form the rotation gears;

[0036] The locking claw 41 and the synchronizer 43 are circumferentially fixedly connected and axially slidably connected;

[0037] When the locking claw 41 slides axially along the synchronizer 43, it is either annularly fixedly connected with any of the claw-engaging connecting gears 44, or is separated from the claw-engaging connecting gear 44;

[0038] When the locking claw 41 is circumferentially fixedly connected to the claw connection gear 44, it remains circumferentially fixedly connected to the synchronizer 43;

[0039] That is, the locking claw 41 will never be completely separated from the synchronous member 43 , and the two will rotate synchronously with the rotation of the handle joint 2 .

[0040] The unlocking assembly 42 acts on the locking claw 41 to make it slide back and forth along the axial direction of the synchronous member 43. After the locking claw 41 slides along the axial direction of the synchronous member 43 until it is out of the claw connection gear 44, the rotation of the locking claw 41, the shaft of the synchronous member 43 and the handle joint 2 is no longer restricted, and the three can rotate relative to the chassis joint 1 until another gear. When the unlocking assembly 42 reacts to the locking claw 41, the locking claw 41 slides in the opposite direction along the axial direction of the synchronous member 43 until it is connected with the selected claw connection gear 44, and the locking claw 41, the shaft of the synchronous member 43 and the handle joint 2 are restricted from rotating again and locked.

[0041] The synchronizer 43 / the claw connection position 44 can be configured independently or integrally arranged on the handle joint 2 / chassis joint 1. The synchronizer 43 / the claw connection position 44 can be a convex structure or a concave structure. A specific example is:

[0042] The synchronizer 43 is a synchronizer groove provided on the handle joint 2, the claw connection gear 44 is a gear groove provided on the chassis joint 1, and a plurality of the gear grooves are distributed circumferentially around the central axis 3;

[0043] The synchronization groove matches the locking claw 41, and the locking claw 41 falls into the synchronization groove. The locking claw 41 is fixedly connected to the synchronization groove in an annular direction and slidably connected in an axial direction; the gear groove also matches the locking claw 41, and the locking claw 41 can be switched to fall into any of the gear grooves.

[0044] The unlocking assembly 42 is used to drive the locking claw 41 to perform bidirectional axial sliding.

[0045] An axial pushing mechanism is provided between the unlocking block and the locking claw 41. The axial pushing mechanism pushes the locking claw 41 to slide axially as the unlocking block rotates. Figure 6 As shown; the axial pushing mechanism can be a cam pushing mechanism, which includes a cam push block and a push bevel, which contact and cooperate with each other. The specific shape, quantity, position, distribution relationship, installation object, etc. of the cam push block and the push bevel can be designed according to actual needs, as long as the locking claw 41 can be pushed to slide axially. In order to reset the unlocking block and the locking claw 41 as a whole, the reset member needs to act on the locking claw 41. The action direction of the reset member is opposite to that of the axial pushing mechanism. The reset member pushes the locking claw 41 to make it slide axially in the reverse direction. The axial pushing mechanism pushes the unlocking block to rotate and reset in the reverse direction as the locking claw 41 slides axially in the reverse direction. The reset member usually adopts one or more springs.

[0046] More specifically, the axial pushing mechanism pushes the locking claw 41 to slide axially in the direction of the handle joint 2 as the unlocking block rotates, and causes the locking claw 41 to disengage from the claw connection gear 44; the reset member pushes the locking claw 41 to slide axially in the direction of the chassis joint 1, such as Figure 7 shown.

[0047] In order to improve the connection stability between the locking claw 41 and the synchronization groove and the shift groove, the locking claw 41 includes a locking ring, which is movably mounted on the central shaft 3, and a plurality of claws of different shapes are divergently provided on the locking ring;

[0048] The synchronization groove is arranged around the central axis 3 and matches the shape of the locking claw 41, and the depth of the synchronization groove can completely accommodate the locking claw 41;

[0049] The chassis joint 1 is provided with a connecting groove around the central axis 3, and the connecting groove is configured as three gear slots. The three gear slots have a common part and a non-common part, wherein the common part mainly accommodates the lock ring, and the non-common part is used to accommodate claws at different positions.

[0050] Recombination Figure 8 As shown, the structure of an unlocking component 42 is: the unlocking component 42 includes an unlocking block, a first cable, and a reset member, the unlocking block is movably mounted on the central axis 3, one end of the first cable is connected to the unlocking block, one end of the first cable is arranged to be hand-held and pulled, and the first cable pulls the unlocking block to rotate circumferentially around the central axis 3.

[0051] Embodiment 2:

[0052] like Figure 1-12 As shown, a baby stroller includes a walking frame A, a wheel assembly B is provided at the bottom of the walking frame A, a seat is provided at the top of the walking frame A, a pushing handle C is connected to the upper part of the walking frame A, and the walking frame A and the pushing handle C are connected by the stroller handle switching system described in Example 1, wherein:

[0053] The chassis joint 1 is fixedly connected to the upper part of the traveling frame A;

[0054] The handle joint 2 is fixedly connected to the lower part of the pushing handle C.

[0055] Generally, four wheel assemblies B are provided at the bottom of the traveling frame A, and the four wheel assemblies B are all universal wheel assemblies, wherein two wheel assemblies B are located at the front of the traveling frame A to form front wheels, and two wheel assemblies B are located at the rear of the traveling frame A to form rear wheels;

[0056] The pushing handle C can be formed separately from the handle joint 2 or integrally. The pushing handle C and the handle joint 2 are fixedly connected to form a whole. The pushing handle C is kept in a forward, vertical or backward tilted state by adjusting and locking the joint lock 4.

[0057] The traveling frame A is provided with a wheel directional lock corresponding to each wheel assembly B, and the working part of the wheel directional lock can act on the wheel assembly B to convert it into a fixed wheel assembly or a universal wheel assembly, and the operating part of the wheel directional lock is linked with the pushing handle C. Specifically, the wheel directional lock and the pushing handle C have the following linkage configuration: when the pushing handle C is adjusted and locked to the forward tilting state, the wheel directional lock converts the front wheel assembly B into a fixed wheel assembly, and keeps the rear wheel assembly B as a universal wheel assembly; when the pushing handle C is adjusted and locked to the backward tilting state, the wheel directional lock converts the rear wheel assembly B into a fixed wheel assembly, and keeps the front wheel assembly B as a universal wheel assembly; when the pushing handle C is adjusted and locked to the vertical state, the wheel directional lock keeps both the front and rear wheel assemblies B as universal wheel assemblies.

[0058] A specific structure of a wheel directional lock is as follows: the wheel directional lock comprises a wheel locking pin 51, a second cable 52, and a switching top pin 53;

[0059] The inner end of the wheel lock pin 51 is connected to one end of the second cable 52, and the other end of the second cable 52 is connected to the inner end of the switch top pin 53; the second cable 52 is arranged along the traveling frame A;

[0060] The wheel assembly B has a vertically fixed rotating pin shaft, and the bottom of the traveling frame A has a vertically arranged rotating pin hole. The wheel assembly B is inserted into the rotating pin hole at the bottom of the traveling frame A through the rotating pin shaft to achieve universal assembly, and the wheel assembly B thus forms a universal wheel assembly. A directional locking hole is also provided at the position of the wheel assembly B facing the traveling frame A, and the directional locking hole cooperates with the wheel locking pin 51. When the wheel locking pin 51 is inserted into the directional locking hole, the wheel assembly B is converted into a directional wheel assembly, and when the wheel locking pin 51 is pulled out of the directional locking hole, the wheel assembly B is converted into a universal wheel assembly.

[0061] Specifically, the wheel lock pin 51 is slidably mounted on the bottom of the traveling frame A, and the outer end of the wheel lock pin 51 faces the corresponding wheel assembly B, specifically, the directional lock hole on the wheel assembly B. The wheel lock pin 51 is configured with a first elastic member, and the first elastic member has a tendency to push the wheel lock pin 51 toward the corresponding wheel assembly B;

[0062] The switching top pin 53 is slidably mounted on the upper part of the traveling frame A, and the outer end of the switching top pin 53 faces the trolley handle switching system. The switching top pin 53 is provided with a second elastic member, and the second elastic member has a tendency to push the switching top pin 53 toward the joint lock 4;

[0063] The sliding assembly method of the wheel locking pin 51 and the switching top pin 53, as well as the assembly method of the first and second elastic members are all mature existing technologies and will not be described in detail again.

[0064] It is important that the elastic force of the second elastic member is greater than the elastic force of the first elastic member; when the operating part of the wheel directional lock acts on the switching top pin 53 to compress the second elastic member, the wheel lock pin 51 at the end of the second cable is extended into the directional lock hole by the action of the first elastic member, so that the wheel assembly B is converted into a directional wheel assembly;

[0065] When the contact of the operating part of the wheel directional lock is greater than the action of the switch top pin 53, the second elastic member acts to retract the wheel lock pin 51 pulling the end of the second cable, so that the wheel assembly B remains as a universal wheel assembly;

[0066] In this case, the outer end of the wheel lock pin 51 forms the working part of the wheel directional lock, and the outer end of the switch top pin 53 forms the operating part of the wheel directional lock.

[0067] A wheel locking cam 6 is also annularly fixedly mounted on the central axis 3, and the wheel locking cam 6 rotates with the rotation of the pushing handle C. The operating part of the wheel directional lock contacts and cooperates with the wheel locking cam 6. The wheel locking cam 6 can be one cam or multiple cams. The number of cams and the characteristics they should have can be designed based on the linkage relationship between "the operating part of the wheel directional lock and the pushing handle C"; this design is easy to implement for those skilled in the art and will not be elaborated here.

[0068] In order to facilitate the operation of the first cable, the interior of the push handle C is a hollow structure, and the hand-held pulling end of the first cable passes through the interior of the push handle C. The push handle C includes a "U"-shaped tube and a linear cannula, and the two free ends of the "U"-shaped tube are respectively connected to the linear cannula, and the free end of the "U"-shaped tube is inserted into the linear cannula, and the other end of the linear cannula is fixedly connected to the handle joint 2.

[0069] The first cable extends from the handle joint 2 into the linear cannula, and a cable through hole is provided in the interlayer between the outer wall of the free end of the "U"-shaped tube and the inner wall of the linear cannula, and the handheld pulling end of the first cable passes through the cable through hole.

[0070] Beneficial effect: By adopting the technical solution of the utility model, the pushing handle of the baby stroller can be switched to three states: forward tilting, backward tilting and vertical accompanying. While meeting daily pushing needs, it can also provide pushing convenience for parents and infants to walk together.

[0071] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. A trolley handle switching system, comprising a chassis joint (1) and a handle joint (2), wherein the chassis joint (1) and the handle joint (2) are assembled to be relatively rotatable, and characterized in that: It also comprises a joint lock (4), which has at least three rotation gears. The joint lock (4) cooperates with the chassis joint (1) and the handle joint (2) at the same time, and the relative rotation relationship between the chassis joint (1) and the handle joint (2) is locked by the joint lock (4) in any of the rotation gears.

2. The cart handle switching system according to claim 1, characterized in that: The chassis joint (1) is provided with three rotation gears, wherein: One rotation gear is a forward pushing gear; One rotation gear is a backward pushing gear; One rotation gear is a traveling gear; The accompanying pushing gear is located between the forward pushing gear and the reverse pushing gear.

3. The cart handle switching system according to claim 1 or 2, characterized in that: It also comprises a central axis (3), the chassis joint (1) and the handle joint (2) are mounted on the same central axis (3), the chassis joint (1) and the handle joint (2) are axially fixed on the central axis (3), and the joint lock (4) is arranged between the chassis joint (1) and the handle joint (2).

4. The cart handle switching system according to claim 3, characterized in that: The joint lock (4) comprises a locking claw (41), an unlocking assembly (42), a synchronizing member (43), and a claw connection gear (44); The handle joint (2) is fixedly provided with the synchronizing member (43), and the chassis joint (1) is provided with at least three claw-clamping connection gears (44), and the claw-clamping connection gears (44) form the rotation gears; The locking claw (41) and the synchronizer (43) are circumferentially fixedly connected and axially slidably connected; When the locking claw (41) slides axially along the synchronizer (43), it is either annularly fixedly connected to any one of the claw-engaging connection gears (44), or is separated from the claw-engaging connection gear (44); When the locking claw (41) is circumferentially fixedly connected to the claw-clamping connection gear (44), it remains circumferentially fixedly connected to the synchronizing member (43); The unlocking assembly (42) acts on the locking claw (41) to make it slide back and forth axially along the synchronous member (43).

5. The cart handle switching system according to claim 4, characterized in that: The synchronous member (43) is a synchronous groove provided on the handle joint (2), the synchronous groove matches the locking claw (41), and the locking claw (41) falls into the synchronous groove.

6. The cart handle switching system according to claim 5, characterized in that: The claw connection gear (44) is a gear slot provided on the chassis joint (1), a plurality of the gear slots are circumferentially distributed around the central axis (3), the gear slots match the locking claw (41), and the locking claw (41) can be switched to fall into any of the gear slots.

7. The cart handle switching system according to claim 4, 5 or 6, characterized in that: The unlocking assembly (42) comprises an unlocking block, a first cable, and a reset member, wherein the unlocking block is movably mounted on the central axis (3), one end of the first cable is connected to the unlocking block, and one end of the first cable is arranged to be hand-held and pulled, and the first cable pulls the unlocking block to rotate circumferentially around the central axis (3); An axial pushing mechanism is provided between the unlocking block and the locking claw (41), and the axial pushing mechanism pushes the locking claw (41) to slide axially as the unlocking block rotates; The reset member acts on the locking claw (41), and the action direction of the reset member is opposite to the action direction of the axial pushing mechanism. The reset member pushes the locking claw (41) to make it slide axially in the reverse direction, and the axial pushing mechanism pushes the unlocking block to rotate in the reverse direction and reset it as the locking claw (41) slides axially in the reverse direction.

8. The cart handle switching system according to claim 7, characterized in that: The axial pushing mechanism pushes the locking claw (41) to slide axially in the direction of the handle joint (2) as the unlocking block rotates, and causes the locking claw (41) to disengage from the claw connection gear position (44); The reset member pushes the locking claw (41) to slide axially in the direction of the chassis joint (1).

9. The cart handle switching system according to claim 7, characterized in that: The axial pushing mechanism is a cam pushing mechanism.

10. The cart handle switching system according to claim 6, characterized in that: The locking claw (41) comprises a locking ring, the locking ring is movably sleeved on the central shaft (3), and claws are divergently arranged on the locking ring; The synchronization groove is arranged around the central axis (3); A communication groove is provided on the chassis joint (1) around the central axis (3), and the communication groove is configured as three gear slots.

11. A baby stroller, comprising a walking frame (A), a wheel assembly (B) being provided at the bottom of the walking frame (A), and a pushing handle (C) being connected to the upper part of the walking frame (A), characterized in that: The walking frame (A) and the pushing handle (C) are connected by a push handle switching system according to any one of claims 1 to 10, wherein: The chassis joint (1) is connected to the upper part of the traveling frame (A); The handle joint (2) is connected to the lower part of the pushing handle (C).

12. The baby stroller according to claim 11, characterized in that: The bottom of the traveling frame (A) is provided with four wheel assemblies (B), and the four wheel assemblies (B) are all universal wheel assemblies, two wheel assemblies (B) are located at the front of the traveling frame (A), and two wheel assemblies (B) are located at the rear of the traveling frame (A); The pushing handle (C) is kept in a forward tilted, vertical or backward tilted state through the adjustment and locking of the joint lock (4).

13. The baby stroller according to claim 12, characterized in that: The traveling frame (A) is provided with a wheel directional lock corresponding to each wheel assembly (B), the working part of the wheel directional lock acts on the wheel assembly (B) to convert it into a directional wheel assembly or a universal wheel assembly, and the operating part of the wheel directional lock is linked with the pushing handle (C); The wheel directional lock and the pushing handle (C) are configured as follows: When the pushing handle (C) is adjusted and locked to the forward tilting state, the wheel directional lock converts the front wheel assembly (B) into a directional wheel assembly, and keeps the rear wheel assembly (B) as a universal wheel assembly; When the pushing handle (C) is adjusted and locked to the backward tilted state, the wheel directional lock converts the rear wheel assembly (B) into a directional wheel assembly, and keeps the front wheel assembly (B) as a universal wheel assembly; When the pushing handle (C) is adjusted and locked to a vertical state, the wheel directional lock enables the front and rear wheel assemblies (B) to remain as universal wheel assemblies.

14. The baby stroller according to claim 13, characterized in that: The wheel directional lock comprises a wheel locking pin (51), a second cable (52), and a switching top pin (53); The inner end of the wheel lock pin (51) is connected to one end of the second cable (52), and the other end of the second cable (52) is connected to the inner end of the switch top pin (53); The wheel lock pin (51) is slidably mounted on the bottom of the traveling frame (A), the outer end of the wheel lock pin (51) faces the corresponding wheel assembly (B), and the wheel lock pin (51) is provided with a first elastic member, which has a tendency to push the wheel lock pin (51) toward the corresponding wheel assembly (B); The switching top pin (53) is slidably mounted on the upper part of the traveling frame (A), the outer end of the switching top pin (53) faces the trolley handle switching system, and the switching top pin (53) is provided with a second elastic member, which has a tendency to push the switching top pin (53) toward the joint lock (4); The elastic force of the second elastic member is greater than the elastic force of the first elastic member; The outer end of the wheel locking pin (51) forms the working part of the wheel directional lock, and the outer end of the switching top pin (53) forms the operating part of the wheel directional lock.

15. The baby stroller according to claim 13 or 14, characterized in that: It also comprises a wheel locking cam (6), which rotates with the rotation of the pushing handle (C), and the operating part of the wheel directional lock contacts and cooperates with the wheel locking cam (6).

16. The baby stroller according to claim 15, characterized in that: The wheel locking cam (6) is annularly fixedly sleeved on the central shaft (3), and one end of the central shaft (3) is fixed to the handle joint (2).

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