CN221114039U - Child cart - Google Patents

Abstract

The application discloses a child stroller, which comprises a first foot assembly, a second foot assembly, a handle assembly and a joint assembly, wherein a first wheel is arranged at the bottom of the first foot assembly; the bottom of the second foot assembly is provided with a second wheel; the handle assembly is provided with a using position far away from the first foot assembly and the second foot assembly and a folding position close to the first foot assembly or the second foot assembly, the using positions are two using positions with opposite inclination directions, namely a first using position and a second using position, when the handle assembly rotates between the two using positions, the first locking piece keeps a locking state, and when the handle assembly rotates from the unfolding position to the folding position, the first locking piece is driven to slide and unlock. The direction of the seat relative to the caretaker can be quickly adjusted, and the daily use is convenient.

Description

Child cart

Technical Field

The application relates to the technical field of carts, in particular to a child cart.

Background

The pushchairs are used to load articles or carry children, and existing pushchairs generally comprise a front foot, a rear foot and a handle, wherein the handle is tilted towards the rear foot and the folding direction of the handle is fixed, generally folded close to the rear foot.

The existing child cart cannot change the orientation of a seat for children to sit relative to a caretaker, or the seat needs to be disassembled or rotated to change the orientation, but the heavier seat causes complex operation; and most of the children carts are difficult to turn around in a narrow passage or cannot turn around to move backwards, so that the children carts are inconvenient to use.

Disclosure of utility model

The utility model provides a child stroller, which can quickly adjust the orientation of a seat relative to a caretaker and is convenient to use.

The present application provides a child stroller having an expanded state and a collapsed state comprising:

a first foot assembly, the bottom of which is provided with a first wheel;

a second foot assembly, the bottom of which is provided with a second wheel;

A handle assembly having an operating portion for gripping;

The joint assembly comprises a first element, a second element and a third element which are connected in a coaxial pivot way, wherein the first element, the second element and the third element are respectively connected with the handle assembly, the first foot assembly and the second foot assembly, the joint assembly further comprises a first locking piece and a second locking piece which are respectively used for limiting the relative rotation of the second element and the third element and the relative rotation of the first element and the second element, so that a child can keep an unfolding state, and a first unlocking piece which can coaxially rotate along with the handle assembly;

the handle assembly is provided with a use position far away from the first foot assembly and the second foot assembly and a folding position close to the first foot assembly or the second foot assembly, the use positions are two use positions with opposite inclination directions, namely a first use position and a second use position, the first locking piece keeps a locking state when the handle assembly rotates between the two use positions, and the first locking piece is driven to slide and unlock when the handle assembly rotates from the unfolding position to the folding position;

The first wheel is rotationally connected with the first foot component through a first pivot shaft, the second wheel is rotationally connected with the second foot component through a second pivot shaft, a first locking piece and a second locking piece which are used for limiting the rotation of the wheel around the pivot shaft are respectively arranged on the first foot component and the second foot component, the locking piece is provided with a locking state which enables the wheel to be in an oriented state and a releasing state which enables the wheel to be in a universal state, and a first trigger piece and a second trigger piece which are connected with the first locking piece and the second locking piece through pull wires are respectively movably arranged on the first element and the second element;

When the handle assembly is switched between a first use position and a second use position, the first unlocking piece pushes against one triggering piece and allows the other triggering piece to reset, so that the corresponding locking piece is switched between a locking state and a unlocking state.

The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions.

Optionally, the first locking member is movable in a radial direction of the joint assembly.

Optionally, the first locking piece is slidably assembled on the second element or the third element, and a locking groove matched with the first locking piece and an arc avoiding groove allowing the first locking piece to rotate are arranged on the corresponding third element or the second element.

Optionally, the first element has a pivot shaft connecting the second element and the third element, and the first unlocking element is connected to the pivot shaft.

Optionally, a second unlocking member is included for driving the second locking member to move and unlock.

Optionally, the second element is provided with a first locking groove which cooperates with the second locking member to enable the handle assembly to stay in the use position and a second locking groove which enables the handle assembly to stay in the folded position.

Optionally, the first locking groove is deeper than the second locking groove.

Optionally, the first unlocking piece is provided with a third driving part which is arranged along the circumferential direction of the first unlocking piece and pushes the first locking piece to move and unlock, and when the handle assembly rotates between two using positions, the first locking piece is staggered with the third driving part.

Optionally, the first unlocking piece is provided with a first driving part and a second driving part, wherein the first driving part is arranged along the circumference of the first unlocking piece and is used for pushing the first triggering piece, the second driving part is used for pushing the second triggering piece, when the handle assembly is in the use position, one driving part is used for pushing the corresponding triggering piece, and the other driving part is staggered with the corresponding triggering piece.

Optionally, in the folded state, the locking members are in a release state.

According to the child stroller, the inclination direction of the child stroller is adjusted by rotating the handle assembly, the direction of the seat relative to a caretaker and the advancing direction of the child stroller can be changed, the child stroller can be used for nursing children and used in narrow channels, and the handle assembly can be rotated in the corresponding inclination direction to be close to the near foot assembly, so that the child stroller is convenient to fold and operate.

Drawings

FIG. 1a is a view of the handle assembly in a first position according to one embodiment of the present application;

FIG. 1b is a view of the handle assembly in a second position according to one embodiment of the present application;

FIG. 1c is a schematic view of a handle assembly rotated closer to a second foot assembly in accordance with one embodiment of the present application;

FIG. 1d is a schematic view of a handle assembly rotated closer to a first leg assembly according to an embodiment of the present application;

FIG. 2 is a structural view of a joint assembly according to one embodiment of the present application;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a schematic view of a first locking member of a joint assembly according to an embodiment of the present application;

FIG. 5 is a structural view of a third element of the joint assembly according to one embodiment of the present application;

FIG. 6 is a front view of an articulation component according to one embodiment of the present application;

FIG. 7 is a side view of the joint assembly of FIG. 6;

FIG. 8 is a cross-sectional view taken along section A-A of FIG. 6 (the second latch member being in the latched state);

FIG. 9 is a section view of section D-D of FIG. 7 (the first member in the first position);

FIG. 10 is a section view of section C-C of FIG. 7 (first member in a first position);

FIG. 11 is an exploded view of the first member, first unlocking member and second locking member of FIG. 2;

FIG. 12 is an exploded view of the first member and the first release member of FIG. 11;

FIG. 13 is a view of the third element of FIG. 3;

FIG. 14 is a structural view of the second locking member of FIG. 11;

FIGS. 15 and 16 are structural views of section A-A of FIG. 6 (corresponding to locking and unlocking of the second locking member);

FIG. 17 is a section view of section E-E of FIG. 7;

FIG. 18 is a cross-sectional view taken along section C-C of FIG. 7 (the first unlocking member pushing the first triggering member);

FIG. 19 is a section view taken along section D-D of FIG. 7 (first release member unseating from second trigger member);

FIG. 20 is the first release member of FIG. 7 retracted from the first trigger member;

FIG. 21 is a view of the first release member of FIG. 7 pushing against a second trigger member;

FIG. 22 is a block diagram of a first unlocking member of a stroller according to an embodiment of the present application;

FIG. 23 is a section view of section D-D of FIG. 7 (handle assembly in folded position);

FIG. 24 is a section view of section C-C of FIG. 7 (handle assembly in folded position);

FIG. 25 is a section view taken along section B-B of FIG. 7 (with the handle assembly in a first use position);

FIG. 26 is a section view taken along section B-B of FIG. 7 (with the handle assembly in a second use position);

FIG. 27 is a cross-sectional view of a first wheel in a stroller in accordance with an embodiment of the present application in a gimbaled state;

Fig. 28 is a cross-sectional view of a first wheel in an oriented condition in a stroller in accordance with an embodiment of the present application.

Reference numerals in the drawings are described as follows:

1. A joint assembly; 10. axial direction; 110. a first element; 111. a pivot shaft; 112. a clamping groove; 113. a second elastic member; 114. a pull wire; 120. a second element; 121. a first locking groove; 122. a second locking groove; 123. a first elastic member; 130. a third element; 131. a locking groove; 132. arc avoiding grooves; 140. a first locking member; 141. a sliding pin; 142. a notch; 150. a first unlocking member; 151. a clamping block; 153. a driving section; 153a, a first driving part; 153b, a second driving part; 153c, a third driving section; 160. a second locking member; 161. a locking pin; 170. a second unlocking member; 2. a child cart; 210. a handle assembly; 220. a first foot assembly; 221. a first wheel; 222. a first locking member; 223. a first trigger; 224. a wheel seat; 225. a first locking groove; 230. a second foot component; 231. a second wheel; 233. a second trigger; 240. and (5) a seat.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring back to fig. 1a, 1b, 1c and 1d, the present application also provides a stroller 2 comprising a handlebar assembly 210, a first foot assembly 220, a second foot assembly 230 and a joint assembly 1, wherein a first wheel 221 is provided at the bottom of the first foot assembly 220, and a second wheel 231 is provided at the bottom of the second foot assembly 230. The first wheel 221 and the second wheel 231 have two states of universal/directional.

The first 110, second 120 and third 130 elements of the joint assembly 1 are connected to the handle assembly 210, the first leg assembly 220 and the second leg assembly 230, respectively. The handle assembly 210 has a use position away from the first leg assembly 220 and the second leg assembly 230 and a folded position proximate to either the first leg assembly 220 or the second leg assembly 230.

In some embodiments, the handle assembly 210 has two positions of use in the deployed state of the stroller, shown in fig. 1a, closer to the second foot assembly 230, and in fig. 1b, closer to the first foot assembly; in the collapsed condition of the stroller, the handle assembly 210 has two collapsed positions, shown in fig. 1c, closed to the first foot assembly and, shown in fig. 1d, closed to the second foot assembly.

The two usage positions of the handle assembly 210 are opposite in direction, namely a first usage position (fig. 1 a) and a second usage position (fig. 1 b), and the different usage positions relatively change the sitting posture direction of the child (namely the direction of the seat 240), so that the child seat can adapt to different care scenes. The two positions of use, the wheel-adaptive switching states (directional/universal) of the first foot assembly and the second foot assembly, the specific switching is described in further detail in the following examples.

When the handle assembly 210 rotates between the two use positions, the first locking member 140 maintains a locked state, keeping the two foot assemblies unfolded; when the handle assembly 210 rotates from the unfolded position to the folded position (corresponding to the unfolded state and the folded state of the stroller), the first locking piece 140 is driven to slide and unlock, and the two leg assemblies can rotate and close under the gravity in the suspended state.

According to the child cart, the direction of the seat relative to a caretaker and the advancing direction of the child cart can be changed by rotating the handle assembly to adjust the inclination direction of the child cart, so that the child cart is convenient to care children and use in a narrow channel without turning around; and when the folding handle is folded, the handle assembly can rotate to close the nearby foot assembly, so that the folding is convenient.

As shown in fig. 1a, 1b and 2, the joint assembly 1 has a folded state corresponding to a stroller and an unfolded state having an axial direction 10, as shown in fig. 1a and 1 b. In the following examples, the axial direction is the axial direction of the joint assembly 1, unless specifically described.

Referring to fig. 3, the first locking member 140 is configured to limit relative rotation of the second member 120 and the third member 130 such that the joint assembly 1 remains in the deployed state; the first unlocking member 150 can coaxially rotate along with the first element 110 to drive the first locking member 140 to move for unlocking.

Wherein the first locking member 140 is movable in a radial (relative axial) direction of the joint assembly and has: a locking position that restricts relative rotation of the second member 120 and the third member 130, and a release position that releases the restriction of the second member 120 and the third member 130. In the unlocked position, the second member 120 and the third member 130 are rotated toward one another by gravity. The first unlocking member 150 is rotatably arranged, and the first locking member moves radially, so that space required by axial movement is saved, and the axial size of the joint assembly is reduced. The first unlocking member 150 is connected with the first element 110 in a split or integrated manner, so as to realize coaxial rotation.

The first unlocking member 150 has a third driving portion 153c arranged in the circumferential direction to push the first locking member 140 to move for unlocking. During the rotation of the first unlocking member 150, when the third driving portion 153c aligns with the first locking member 140, the second element 120 and the third element 130 are located at the unlocking positions; in contrast, the third driving portion 153c is offset from the first locking member 140, and the second member 120 and the third member 130 are in the locked state. The third driving portion 153c is specifically described in the following embodiments.

In some embodiments, as shown in fig. 4 to 10, the first locking member 140 is slidably mounted on the second or third member, and the other, i.e., the third or second member, is provided with a locking groove 131 for engaging the first locking member 140 and a circular arc escape groove 132 for allowing the first locking member 140 to rotate.

In the figures, the first locking member 140 is slidably mounted on the second member 120, the second member 120 being provided with a first elastic member 123 acting on the return of the first locking member 140; the locking groove 131 and the arc escape groove 132 are provided on the third member 130, and the first locking member 140 is bar-shaped and is provided with a slide pin 141 engaged with the locking groove 131 and the arc escape groove 132. The center of the arc avoiding groove 132 is located at the axis of the joint assembly and has a function of guiding the rotation of the first locking member 140, and in a preferred embodiment, the locking groove 131 and the arc avoiding groove 132 are two groups of two opposite sliding pins 141.

As shown in fig. 11 and 12, in some embodiments, the first element 110 has a pivot shaft 111 that connects the second element 120 and the third element 130, and the first unlocking member 150 is connected to the pivot shaft 111, which may be integrally formed or may be a split structure, so long as the first unlocking member and the third unlocking member keep rotating synchronously in the circumferential direction. The illustrated central rotating shaft 111 and the first unlocking piece 150 are of split type structures, the clamping groove 112 is formed in the end portion of the central rotating shaft 111, the first unlocking piece 150 is of a columnar structure, the clamping block 151 matched with the clamping groove 112 is arranged on the end portion in a protruding mode, the central rotating shaft 111 abuts against one end face of the first unlocking piece 150 in the axial direction during assembly, the other end face of the first unlocking piece 150 is limited to the second element 120 or the third element 130, and the structure is convenient to assemble.

Referring to fig. 8 and the foregoing embodiments, the first locking member 140 may slide along the radial direction of the joint assembly, and the first locking member 140 is sleeved on the outer periphery of the first unlocking member 150, and the two members overlap each other in the axial direction, so that the space inside the joint assembly may be fully utilized.

The first locking piece 140 has a notch 142 for accommodating the first unlocking piece 150, and an inclined plane matched with the first unlocking piece 150 is arranged between the first locking piece and the first unlocking piece 150, when unlocking is needed, the first unlocking piece 150 drives the first locking piece 140 to move along the radial direction of the joint assembly through the inclined plane, the sliding pin 141 slides to the junction position of the locking groove 131 and the arc avoiding groove 132, unlocking is achieved, and the second element 120 and the third element 130 can rotate relatively. The first resilient member 123 may urge the first locking member 140 to return when the joint assembly is deployed.

In some embodiments, the joint assembly 1 includes a second locking member 160 that limits relative rotation of the first and second members 110, 120 and a second unlocking member 170 that drives the second locking member 160 to move for unlocking. The second unlocking member 170 is rotatable about the pivot axis 111 and has a locking pin extending towards the second member 120, the corresponding second member 120 being provided with a locking groove with respect to the surface of the first member. The second unlocking member 170 and the second locking member 160 have matching inclined surfaces, and when the second unlocking member 170 rotates, the second locking member 160 can be driven to move along the axial direction, so that the second unlocking member is separated from the second element 120, and the rotation restriction of the first rotating element 110 is released.

When the handle assembly 210 is rotated between the two use positions, the first locking member 140 is offset from the third driving portion 153 c. In order to realize bidirectional unlocking, the driving part is in a fan-shaped structure, and two side surfaces of the fan-shaped structure can be matched with inclined surfaces on the first locking piece 140 to drive the first locking piece 140 to slide along the radial direction of the joint assembly.

As shown in fig. 13 and 14, in some embodiments, the second member 120 is provided with a first locking groove 121 that cooperates with the second locking member 160 to retain the handle assembly 210 in the use position and a second locking groove 122 that retains the handle assembly 210 in the folded position, to retain the handle assembly 210 in the corresponding position, and in particular to avoid sloshing when in the folded position.

Wherein the second locking member 160 has a locking pin 161 adapted to the first locking groove 121 and the second locking groove 122. For the convenience of the unfolding operation, the groove depth of the second locking groove 122 is not too deep, the side wall is rounded, and the end face of the lock pin 161 matched with the second locking groove 122 is chamfered. The lock pin 161 can naturally withdraw from the second lock groove 122 by the chamfering action of the mutual engagement under the action of an external force (an applied force upon manual deployment). In order to maintain stable use in the unfolded position, the depth of the first locking groove 121 is greater than that of the second locking groove 122, i.e. the lock pin 161 cannot exit the first locking groove 121 under the action of external force, and needs to be unlocked by the second unlocking member 170 and actively triggered by a user.

The first locking groove 121 and the second locking groove 122 are two groups, and correspond to two use positions and two folding positions of the handle assembly 210 respectively, the number of each group is two, and the distances between the two locking grooves in each group and the axis are different, so that incorrect matching in the rotating process is avoided.

As shown in fig. 11 to 17, the second unlocking member 170 has a ring structure, is rotatably sleeved outside the pivot shaft of the first member 110, and is connected to an unlocking button provided on the handle assembly 210 through the pull wire 114. The second locking piece 160 is an annular fluted disc, is axially and slidably arranged between the first element and the second element, is sleeved on the periphery of the second unlocking piece 170, and is provided with mutually matched inclined planes with the second unlocking piece 170; when unlocking, after the second unlocking piece 170 is pulled to rotate, the second unlocking piece 170 is driven by the inclined surface to axially slide to exit one of the first element and the second element. In the drawing, the second unlocking member 170 withdraws from the second element 120 when unlocking, and a second elastic member 113 driving the second locking member to reset and lock is provided on the first element 110.

The following describes the states of the wheels corresponding to the two usage positions:

In some embodiments, the first wheel 221 is rotatably coupled to the first leg assembly 220 via a first pivot axis and the second wheel 231 is rotatably coupled to the second leg assembly 230 via a second pivot axis, and the first leg assembly 220 and the second leg assembly 230 are provided with a first locking member 222 and a second locking member, respectively, that limit rotation of the wheel about the pivot axis, the locking members having a locked state that orients the wheel in an oriented state and an unlocked state that positions the wheel in a universal state. The first and second locking members 222 and 233 are connected to the first and second triggering members 223 and 233, respectively, by a pull wire. The first trigger 223 and the second trigger 233 are slidably fitted on the second element 120 and the third element 130, respectively; when the handle assembly 210 is switched between the first use position and the second use position, the first unlocking member 150 pushes against one of the triggering members and allows the other triggering member to reset, so that the corresponding locking member is switched between the locking state and the unlocking state.

The first wheel and the second wheel have the same structure, as shown in fig. 27 and 28, taking the first locking piece 222 of the first wheel as an example, the bottom of the first foot assembly 220 is rotatably provided with a wheel seat 224 with the first wheel 221, the wheel seat 224 is provided with a first locking groove 225 matched with the first locking piece 222, the first locking piece 222 stretches into the first locking groove 225 to limit the wheel seat 224 to rotate (the first wheel is in an oriented state), and the first locking piece 222 withdraws from the first locking groove 225 to allow the wheel seat to rotate (the first wheel is in a universal state).

In some embodiments, as shown in fig. 18 and 19, when the handle assembly 210 is in the first use position, the first unlocking member 150 pushes the first triggering member 223 to pull the first locking member to unlock, so that the first wheel is in a universal state, and the second locking member is reset under the action of the elastic member to lock the second wheel in an oriented state; as shown in fig. 20 and 21, when the handle assembly 210 is in the second use position, the first unlocking member 150 pushes the second triggering member 233 to pull the second locking member to unlock, so that the second wheel is in a universal state; the first locking piece is reset under the action of the elastic piece and locks the first wheel to be in an oriented state.

In the present application, the first unlocking member 150 rotates along with the first element 110, which is used for unlocking the first locking member 140 and switching between two wheels, and is multipurpose, so as to reduce the assembly difficulty and failure rate.

As shown in fig. 18 to 22, the first unlocking member 150 has a first driving portion 153a which is arranged along the circumferential direction thereof to push against the first triggering member and a second driving portion 153b which is arranged to push against the second triggering member, and when the handle assembly 210 is in the use position, one driving portion pushes against the corresponding triggering member and the other driving portion is staggered from the corresponding triggering member.

In the drawing, each driving portion is an outer edge surface of the first unlocking member 150. Wherein the first element 220 and the second element 230 are axially offset, the folding volume is smaller, the corresponding first trigger 223, second trigger 233, and first locking element 140 are axially offset, and by utilizing this feature, the first driving portion 153a, the second driving portion 153b, and the third driving portion 153c are axially arranged and connected.

As shown in fig. 23 and 24, in an embodiment, when the handle assembly 210 is in the folded position, the first driving portion 153a is dislocated from the first triggering member, the second driving portion 153b is dislocated from the second triggering member, and the two locking members are in the unlocking state, so that the first wheel and the second wheel are in universal states, and the steering dislocation is convenient to adjust, so that the first foot assembly and the second foot assembly are closer. Handle assembly 210 is illustrated in a first position.

The child stroller of the present application can change the orientation of the seat by turning the handle assembly to adjust its tilt direction, and the direction of travel of the child stroller, and can be used for caring for children and adapting to special circumstances, for example without 180 degree turn around in a narrow aisle.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. When technical features of different embodiments are embodied in the same drawing, the drawing can be regarded as a combination of the embodiments concerned also being disclosed at the same time.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.

Claims (10)

1. A stroller, having an expanded state and a collapsed state, comprising:

a first foot assembly, the bottom of which is provided with a first wheel;

a second foot assembly, the bottom of which is provided with a second wheel;

A handle assembly having an operating portion for gripping;

The joint assembly comprises a first element, a second element and a third element which are connected in a coaxial pivot way, wherein the first element, the second element and the third element are respectively connected with the handle assembly, the first foot assembly and the second foot assembly, the joint assembly further comprises a first locking piece and a second locking piece which are respectively used for limiting the relative rotation of the second element and the third element and the relative rotation of the first element and the second element, so that a child can keep an unfolding state, and a first unlocking piece which can coaxially rotate along with the handle assembly;

The handle assembly is provided with a use position far away from the first foot assembly and the second foot assembly and a folding position close to the first foot assembly or the second foot assembly, the use positions are two use positions with opposite inclination directions, namely a first use position and a second use position, when the handle assembly rotates between the two use positions, the first locking piece keeps a locking state, and when the handle assembly rotates from the unfolding position to the folding position, the first locking piece is driven to slide and unlock;

The first wheel is rotationally connected with the first foot component through a first pivot shaft, the second wheel is rotationally connected with the second foot component through a second pivot shaft, a first locking piece and a second locking piece which are used for limiting the rotation of the wheel around the pivot shaft are respectively arranged on the first foot component and the second foot component, the locking piece is provided with a locking state which enables the wheel to be in an oriented state and a releasing state which enables the wheel to be in a universal state, and a first trigger piece and a second trigger piece which are connected with the first locking piece and the second locking piece through pull wires are respectively movably arranged on the first element and the second element;

When the handle assembly is switched between a first use position and a second use position, the first unlocking piece pushes against one triggering piece and allows the other triggering piece to reset, so that the corresponding locking piece is switched between a locking state and a unlocking state.

2. The stroller of claim 1, wherein the first lock is movable in a radial direction of the joint assembly.

3. A stroller according to claim 2, wherein the first locking member is slidably mounted on the second or third member, and the third or second member is provided with a locking groove for engaging the first locking member and a circular arc relief groove for allowing rotation of the first locking member.

4. The stroller of claim 1, wherein the first member has a pivot shaft connecting the second and third members, and the first release member is connected to the pivot shaft.

5. The stroller of claim 1, comprising a second unlocking member for urging the second locking member to move for unlocking.

6. The stroller of claim 1, wherein the second member is provided with a first detent that cooperates with the second detent to retain the handle assembly in the use position and a second detent that retains the handle assembly in the collapsed position.

7. The stroller of claim 6, wherein the first locking groove is deeper than the second locking groove.

8. The stroller of claim 1, wherein the first unlocking member has a third drive portion circumferentially disposed therealong that moves the first locking member for unlocking, the first locking member being offset from the third drive portion when the handle assembly is rotated between the two use positions.

9. The stroller of claim 1, wherein the first unlocking member has a first driving portion arranged circumferentially thereof for pushing against the first triggering member and a second driving portion for pushing against the second triggering member, one of the driving portions pushing against the corresponding triggering member and the other driving portion being offset from the corresponding triggering member when the handlebar assembly is in the use position.

10. The stroller of claim 1, wherein in the collapsed condition the locking members are each in a release condition.