Armrest folding mechanism of seat of buggy and buggy

Abstract

The present disclosure describes an armrest folding mechanism for a baby carriage seat and a baby carriage, the baby carriage seat comprising an upper frame, a lower frame, and an armrest pivoted together by the armrest folding mechanism, the armrest folding mechanism comprising a first connector, a second connector, and a third connector connected to rotate relative to each other, the first connecting piece is provided with a clamping piece comprising a protruding part; the second connecting piece is provided with a first sliding groove and a clamping hole, the third connecting piece is provided with a second sliding groove and a positioning hole, and the protruding part can penetrate into the clamping hole and the positioning hole and can slide along the first sliding groove and the second sliding groove; and the clamping hole and the positioning hole are arranged to allow the clamping piece to translate between the locking position and the unlocking position in the radial direction, so that the first connecting piece, the second connecting piece and the third connecting piece are allowed to rotate relative to one another and prevented from rotating relative to one another. According to the armrest folding mechanism disclosed by the invention, the armrest can be synchronously folded when the seat of the buggy is in a folded state.

Description

[0001] Divisional application statement

[0002] This invention is a divisional application of the patent application filed on November 11, 2021, with application number 2021113311136 and titled "Armrest Folding Mechanism for Child Car Seat and Child Car". Technical Field

[0003] This disclosure relates to the field of children's vehicles, and more specifically, to folding mechanisms for children's vehicle seat armrests and children's vehicles. Background Technology

[0004] Usually, such as Figure 1 As shown, the stroller includes a stroller seat 1 and a frame 2 that supports the stroller seat 1. When the stroller seat 1 and frame 2 are separable, the stroller seat 1, when detached from the frame 2, should ideally be foldable for easy storage. In this case, the armrests on the stroller seat 1 also need to be folded down simultaneously. However, since the locking mechanism of the armrests is often different from the locking mechanism for folding the stroller seat 1, the overall structure of the stroller seat 1 is relatively complex, making the manufacture and operation of the stroller more difficult. Summary of the Invention

[0005] The purpose of this disclosure is to propose a novel folding mechanism for a child car seat armrest that can overcome the aforementioned technical problems.

[0006] As embodied and summarized herein, in order to achieve these and other advantages and for the purposes of this disclosure, a child car seat armrest folding mechanism is provided, the child car seat including an upper frame, a lower frame, and an armrest, the upper frame, the lower frame, and the armrest being pivotally connected together by the armrest folding mechanism, the armrest folding mechanism including: a first connector connected to the upper frame; a second connector connected to the lower frame; and a third connector connected to the armrest; the first connector, the second connector, and the third connector are connected by a connecting shaft to be rotatable relative to each other about a central axis, wherein the first connector has a translationally movable engaging member, the engaging member including a protrusion; and its In the first connector, the second connector has a first groove extending about the central axis and a locking hole communicating with one end of the first groove. The third connector has a second groove extending about the central axis and a positioning hole communicating with one end of the second groove. The radial positions of the first groove and the second groove are corresponding, and the radial positions of the locking hole and the positioning hole are corresponding. The protrusion can pass through the locking hole and the positioning hole and can slide along the first groove and the second groove. The radial width of the locking hole and the positioning hole is set to be greater than the radial width of the first groove and the second groove, allowing the locking member to translate radially between the locked position and the unlocked position. When the engaging member is translated to the locked position, the protrusion moves to a position in the engaging hole and the positioning hole that is offset from the first and second slide grooves and cannot enter the first and second slide grooves, thereby preventing the first connector, the second connector and the third connector from rotating relative to each other; when the engaging member is translated to the unlocked position, the protrusion moves to a position in the engaging hole and the positioning hole that is aligned with the first and second slide grooves and can enter the first and second slide grooves for sliding, thereby allowing the first connector, the second connector and the third connector to rotate relative to each other.

[0007] In another embodiment, this disclosure proposes a folding armrest mechanism for a child car seat. The child car seat includes an upper frame, a lower frame, and an armrest. The upper frame, the lower frame, and the armrest are pivotally connected together by the armrest folding mechanism. The armrest folding mechanism includes: a first connecting member connected to the upper frame; a second connecting member connected to the lower frame; and a third connecting member connected to the armrest. The first, second, and third connecting members are connected by a connecting shaft to be rotatable relative to each other about a central axis. The second connecting member has a translational engaging member, which includes protrusions extending toward both sides of the second connecting member. Furthermore, the second connecting member has through holes through which the protrusions pass. The first connecting member has a connecting member that extends around the central axis. The third connector has a first connecting groove extending along the central axis and a first connecting engagement hole communicating with one end of the first connecting groove. The third connector has a second groove extending around the central axis and a positioning hole communicating with one end of the second groove. The radial positions of the first connecting groove and the second groove are corresponding, as are the radial positions of the first connecting engagement hole, the through hole, and the positioning hole. The protrusion can pass through the first connecting engagement hole and the positioning hole and can slide along the first connecting groove and the second groove. The radial width of the first connecting engagement hole, the through hole, and the positioning hole is set to be greater than the radial width of the first connecting groove and the second groove, allowing the engaging member to translate radially between a locked position and an unlocked position.

[0008] In one embodiment, the armrest folding mechanism is further provided with a first elastic element, which drives the engaging element to move to the locking position.

[0009] In one embodiment, the armrest folding mechanism is further provided with a locking mechanism that can be operated to move the locking member to the locking position.

[0010] In one embodiment, the release element is a steel wire, one end of which is connected to the locking element and the other end of which is connected to the operating part located on the upper frame.

[0011] In one embodiment, the third connector has a reinforcing protrusion on its periphery, and the second connector has an abutting surface at a corresponding position on its periphery. The reinforcing protrusion abuts against the abutting surface to restrict the rotation of the third connector relative to the second connector.

[0012] In one embodiment, the armrest folding mechanism is further provided with a seat fixing part, which is fixed to the first connector and can be engaged with a support part provided on the frame, so that the child car seat can be detachably placed on the frame.

[0013] In one embodiment, the seat fixing part is provided with a locking hook, and the support part is provided with a locking protrusion. The locking hook can engage or disengage with the locking protrusion to prevent the seat fixing part from disengaging from the support part or to allow the seat fixing part to disengage from the support part.

[0014] In one embodiment, the seat fixing part is further provided with a second elastic member, which drives the engaging hook to engage with the engaging protrusion.

[0015] In one embodiment, the seat fixing part is further provided with a button that can be pressed to disengage the engaging hook from the engaging protrusion.

[0016] In another embodiment, this disclosure proposes a child stroller that employs the aforementioned child stroller seat armrest folding mechanism.

[0017] The beneficial effect of this disclosure is that the folding mechanism of the stroller seat armrest according to this disclosure can realize that when the stroller seat is in the unfolded state, the armrest is in the usable position; when the stroller seat is in the folded state, the armrest can be folded simultaneously. Moreover, the stroller structure is simpler and easier to operate.

[0018] The foregoing and other objects, features, aspects and advantages of this disclosure will become more apparent from the following detailed description of the disclosure taken in conjunction with the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings are included herein to provide a further understanding of the present disclosure and are incorporated in and form a part of this specification. The drawings illustrate embodiments of the present disclosure and, together with the following description, serve to illustrate the ideas of the present disclosure.

[0020] In the attached diagram:

[0021] Figure 1 It is a 3D model of a children's car, including the car seat and frame.

[0022] Figure 2 yes Figure 1 The image shown is a 3D representation of a child car seat.

[0023] Figure 3 This is a perspective view of the armrest folding mechanism in the locked state according to this disclosure.

[0024] Figure 4 yes Figure 3 The image shows a partially exploded perspective view of the armrest folding mechanism.

[0025] Figure 5 yes Figure 3 The diagram shown is a perspective view of the armrest folding mechanism after the third connector has been removed.

[0026] Figure 6 yes Figure 5 The diagram shows a perspective view of the armrest folding mechanism in the unlocked state.

[0027] Figure 7 This is a perspective view of the third connector of the armrest folding mechanism according to this disclosure.

[0028] Figure 8 This is a cross-sectional view of the handrail folding mechanism according to this disclosure.

[0029] Figure 9 yes Figure 2 The diagram shows a child car seat in its unfolded state.

[0030] Figure 10 yes Figure 2 The diagram shows the stroller seat in its folded-down state.

[0031] Figure 11 yes Figure 2 The diagram shows the child car seat in a further folded-down state.

[0032] Figure 12 This is a perspective view of the armrest folding mechanism according to this disclosure from another angle, showing the reinforced protrusion abutting the contact surface.

[0033] Figure 13 It is along Figure 1 The cross-sectional view cut along line 'I-I' shows the engagement of the hook and the engagement protrusion.

[0034] Figure 14 It is along Figure 1 A sectional view taken along line 'I-I', showing the engagement hook disengaged from the engagement protrusion.

[0035] List of reference numerals

[0036] 1 Child car seat

[0037] 11 upper frame

[0038] 12 Lower Frame

[0039] 13 handrails

[0040] 14 Operations Department

[0041] 2 children's bicycle frame

[0042] 21 Bearing Unit

[0043] 240 locking protrusions

[0044] 100 First Connector

[0045] 101 First Connecting Section

[0046] 110 card assembly

[0047] 111 Protrusion

[0048] 120 First Elastic Component

[0049] 130 unlocking parts

[0050] 200 Second Connector

[0051] 201 Second Connecting Part

[0052] 210 First Slide

[0053] 220 snap-fit ​​hole

[0054] 230 contact surface

[0055] 300 Third Connector

[0056] 301 Connecting Slot

[0057] 310 Second Slide

[0058] 320 positioning hole

[0059] 330 reinforced protrusion

[0060] 400 connecting shaft

[0061] 500 seat fixing part

[0062] 510 card hook

[0063] 520 Second Elastic Component

[0064] 530 button

[0065] Radial width of the first groove of W210

[0066] Radial width of W220 engagement hole

[0067] Radial width of the second groove of W310

[0068] Radial width of W320 positioning hole Detailed Implementation

[0069] This disclosure will now be described in detail with reference to the accompanying drawings.

[0070] like Figure 2 As shown, the child car seat 1 of the child car according to this disclosure includes an upper frame 11, a lower frame 12 and an armrest 13. The upper frame 11, the lower frame 12 and the armrest 13 are pivotally connected together by an armrest folding mechanism so that the three can pivot to each other and fold up.

[0071] Figure 3 The present disclosure illustrates a handrail folding mechanism comprising a first connector 100, a second connector 200, and a third connector 300, which are connected by a connecting shaft 400. Figure 8 (As shown in the image) are connected so that they can rotate relative to each other about a central axis.

[0072] The first connector 100 is connected to the upper frame 11, the second connector 200 is connected to the lower frame 12, and the third connector 300 is connected to the handrail 13. Because the first connector 100, the second connector 200, and the third connector 300 can rotate relative to each other, the upper frame 11, the lower frame 12, and the handrail 13, which are respectively connected to them, can pivot relative to each other. This connection can be fixed or detachable. For example, in... Figure 3 In one embodiment, the first connector 100 extends a first connecting portion 101 for fixed connection with the upper frame 11; the second connector 200 extends a second connecting portion 201 for fixed connection with the lower frame 12; and the third connector 300 has a connecting groove 301 on its outer end face facing away from the second connector 200 for detachable connection with the handrail 13. However, this disclosure is not limited thereto.

[0073] In addition, although the first connector 100, the second connector 200 and the third connector 300 shown in the figure are disc-shaped, they can also take other shapes.

[0074] The following will describe in detail how the armrest folding mechanism according to this disclosure enables the stroller seat 1 to switch between an unfolded state and a folded state and to remain in the unfolded state.

[0075] To achieve the above functions, the upper frame 11 and lower frame 12 of the stroller seat 1 need to be able to pivot relative to each other and maintain a certain pivot angle, for example... Figures 2-5 The 180° angle is shown. That is, the first connector 100 and the second connector 200 need to be able to rotate relative to each other, and also be locked together so that they cannot rotate. For this purpose, as shown... Figure 4As shown, the first connector 100 is connected to a locking member 110, allowing the locking member to translate relative to the first connector 100 between a locked and unlocked position, but preventing rotation relative to the first connector 100. The locking member 110 includes a protrusion 111. Correspondingly, the second connector 200 has a first groove 210 extending about a central axis and a locking hole 220 communicating with one end of the first groove 210. The protrusion 111 can pass through the locking hole 220 and slide along the first groove 210, such as... Figure 5 and Figure 6 As shown. The extension arc of the first groove 210 can be approximately 180° or slightly less than 180°, thereby allowing maximum folding between the upper frame 11 connected to the first connector 100 and the lower frame 12 connected to the second connector 200.

[0076] like Figure 6 As shown, the radial width W220 of the engaging hole 220 is greater than the radial width W210 of the first groove 210, and the radial width W220 of the engaging hole 220 should be set such that after the protrusion 111 enters the engaging hole 220, the engaging member 110 is allowed to translate radially between the locked position and the unlocked position, thereby enabling the engaging member 110 to lock and unlock relative to the rotation between the first connector 100 and the second connector 200.

[0077] Specifically, when the locking component 110 is moved to the locked position, such as Figure 5 As shown, the protrusion 111 is located in the engagement hole 220 at a position offset from the first slide groove 210 and cannot enter the first slide groove 210, thereby preventing the first connector 100 and the second connector 200 from rotating relative to each other. At this time, the stroller seat 1 remains in the unfolded state. Figure 9 .

[0078] When the engaging member 110 is moved to the unlocked position, the protrusion 111 moves to the position in the engaging hole 220 aligned with the first slide groove 210, and can enter the first slide groove 210 for sliding. Figure 6 As shown, this allows the first connector 100 and the second connector to rotate relative to each other. At this time, the stroller seat 1 can switch between an unfolded state and a folded state, see... Figure 10 and Figure 11 .

[0079] In this disclosure, the engaging member 110 can be disposed on the first connector 100 in various common ways. For example, a guide rail for guiding the engaging member 110 can be provided on one end face of the first connector 100; or, two elongated slots can be provided on the engaging member 110, which guide the translation of the engaging member 110, one of which allows the connecting shaft 400 to pass through, and the other allows the pin for connecting the engaging member 110 to the first connector 100 to pass through; or, only one elongated slot for the connecting shaft 400 to pass through can be provided on the engaging member 110, while another elongated slot can be provided on the first connector 100 for the pin for connecting the engaging member 110 to the first connector 100 to pass through.

[0080] In this disclosure, various common methods can be used to achieve translation of the engaging member 110 relative to the first connecting member 100. For example, the engaging member 110 has an operating lever (not shown) extending from the armrest folding mechanism, and translation of the engaging member 110 is achieved by actuating the operating lever. The armrest folding mechanism is also provided with a first elastic element 120, which drives the engaging member 110 to translate to the locked position. The first elastic element 120 can be a compression spring, a leaf spring, or an elastic body, etc. It should be understood that, although in Figure 4 In the preferred embodiment shown, the first elastic element 120 is disposed at the first connector 100. However, the first elastic element can also be disposed at other parts of the armrest folding mechanism. For example, if the engaging member is disposed at the second connector 200, the first elastic element can be disposed at the second connector 200. More preferably, the armrest folding mechanism also includes a release element 130, which can be operated to move the engaging member 110 to the release position. To facilitate the folding of the stroller seat, the release element 130 can be a steel wire, with one end connected to the engaging member 110 and the other end connected to the operating part 14 located on the upper frame 11. When the user operates the operating part 14, the steel wire is pulled, thereby causing the engaging member 110 connected to one end of the steel wire to move horizontally. Of course, this disclosure is not limited to this.

[0081] Next, a detailed description will be provided on how the armrest folding mechanism according to this disclosure enables the armrest 13 of the stroller seat 1 to be folded down synchronously and kept in the use position.

[0082] To achieve this function, the armrest 13 of the stroller seat 1 needs to be able to pivot relative to the upper frame 11 and the lower frame 12 and maintain a certain pivot angle. That is, the third connector 300 needs to be able to rotate relative to the first connector 100 and the second connector 200, but also needs to be locked together so that it cannot rotate. Therefore, as follows... Figure 7Ideally, the third connector 300, on its end face facing the second connector 200, also has a second groove 310 extending around its central axis and a positioning hole 320 communicating with one end of the second groove 310. The protrusion 111 of the engaging member 110 can also pass through the positioning hole 320 and slide along the second groove 310. The extension arc of the second groove 310 can be equal to or less than the extension arc of the first groove 210, but preferably greater than the angle between the armrest 13 and the lower frame 12 in the unfolded state, thereby allowing the armrest 13 connected to the third connector 300 and the lower frame 12 connected to the second connector 200 to be folded down to the maximum extent.

[0083] The radial positions of the first slide groove 210 and the second slide groove 310 correspond to each other, and the radial positions of the engaging hole 220 and the positioning hole 320 also correspond to each other. Furthermore, as... Figure 7 As shown, the radial width W320 of the positioning hole 320 is greater than the radial width W310 of the second slide groove 310. The radial width W320 of the positioning hole 320 is also set so that after the protrusion 111 passes through the positioning hole 320, the engaging member 110 is allowed to translate radially between the locked position and the unlocked position, thereby enabling the engaging member 110 to lock and unlock relative to the relative rotation between the third connecting member 300 and the first connecting member 100 and the second connecting member 200.

[0084] Specifically, when the engaging member 110 is translated to the locked position, the protrusion 111 moves to a position in the positioning hole 320 that deviates from the second slide groove 310 and cannot enter the second slide groove 310, thereby preventing relative rotation between the third connector 300 and the first connector 100 and the second connector 200. At this time, the armrest 13 connected to the third connector 300 remains in the use position, such as... Figure 9 As shown.

[0085] When the engaging member 110 is moved to the unlocked position, the protrusion 111 moves to the position in the positioning hole 320 aligned with the second slide groove 310, allowing it to slide into the second slide groove 310, thereby allowing relative rotation between the third connector 300 and the first connector 100 and the second connector 200. At this time, the handrail 13 connected to the third connector 300 can be folded down synchronously, as... Figure 10 and Figure 11 As shown.

[0086] With the above configuration, the armrest folding mechanism of this disclosure can achieve the following: when the stroller seat 1 is in the unfolded state, the armrest 13 is in the usable position; when the stroller seat 1 is in the folded state, the armrest 13 can be folded simultaneously. Moreover, the structure is simpler and easier to operate.

[0087] Of course, the above description of the armrest folding mechanism according to this disclosure is based on the example of the engaging member 110 being connected to the first connecting member 100, but this disclosure is not limited thereto. In a variant, the engaging member can be connected to the second connecting member 200. In this variant, the structures of the first connecting member 100 and the second connecting member 200 are changed, while the structure of the third connecting member 300 remains unchanged.

[0088] Specifically, the engaging member can be connected to either side of the second connector 200, allowing it to translate relative to the second connector 200 between a locked and unlocked position, but not to rotate relative to the second connector 200. The engaging member includes protrusions projecting toward both sides of the second connector 200, and the second connector 200 has through holes for the protrusions to pass through, so that regardless of which side of the second connector 200 the engaging member is connected to, the protrusions of the engaging member can protrude into both the first connector 100 and the third connector 300.

[0089] Correspondingly, the first connector 100 is provided with a first connector groove that extends and bends around the central axis and a first connector engagement hole that communicates with one end of the first connector groove.

[0090] The radial positions of the first connecting groove of the first connector 100 and the second groove of the third connector 300 are corresponding. The radial positions of the first connecting engagement hole of the first connector 100, the through hole of the second connector 200, and the positioning hole of the third connector 300 are also corresponding. Moreover, the protrusion can be inserted into the first connecting engagement hole and the positioning hole and can slide along the first connecting groove and the second groove.

[0091] The radial width of the first connector engagement hole, through hole, and positioning hole is set to be greater than the radial width of the first connector groove and the second groove, and the engagement member is allowed to translate radially between the locked position and the unlocked position, thereby enabling the engagement member to allow and prevent the first connector 100, the second connector 200, and the third connector 300 from rotating relative to each other.

[0092] Below, several specific embodiments of the armrest folding mechanism according to this disclosure will be described, which enable more reliable and convenient use of strollers.

[0093] In one embodiment, to enhance the positioning of the armrest 13 in its usage position, such as... Figure 12As shown, a reinforcing protrusion 330 may be provided on the periphery of the third connector 300, and a contact surface 230 may be provided at the corresponding position on the periphery of the second connector 200. When the handrail 13 is used as a handle and is pulled upward, the reinforcing protrusion 330 will abut against the contact surface 230 to limit the rotation of the third connector 300 relative to the second connector 200, thereby strengthening the positioning of the handrail 13.

[0094] In another embodiment, where the stroller seat 1 and the frame 2 are separable, to facilitate the placement of the stroller seat 1 onto the frame 2 and the removal of the stroller seat 1 from the frame 2, the armrest folding mechanism may also include a seat fixing part 500. This seat fixing part 500 is fixed to the first connecting member 100 and can engage with the support part 21 provided on the frame 2. Figure 13 and Figure 14 As shown, this allows the stroller seat to be detachably mounted on the frame.

[0095] Furthermore, to prevent the seat fixing part 500 from accidentally detaching from the support part 21 and causing the risk of separation between the child car seat 1 and the frame 2, the seat fixing part 500 may be provided with a locking hook 510, and the support part 21 may be provided with a locking protrusion 240; or conversely, the seat fixing part 500 may be provided with a locking protrusion 240, and the support part 21 may be provided with a locking hook 510. The locking hook 510 can engage or disengage with the locking protrusion 240 to prevent the seat fixing part 500 from detaching from the support part 21 or to allow the seat fixing part 500 to detach from the support part 21.

[0096] exist Figure 13 and Figure 14 In the example shown, the engaging hook 510 is pivotable, thereby engaging or disengaging with the engaging protrusion 240. However, this disclosure is not limited thereto; the engaging hook 510 may also translate laterally, or the engaging protrusion 240 may be movable, in order to engage or disengage both.

[0097] To simplify operation, the seat fixing part 500 may also be provided with a second elastic element 520, which drives the engaging hook 510 to engage with the engaging protrusion 240. The second elastic element 520 may be a tension spring, a leaf spring, or an elastomer, etc.

[0098] In a more preferred example, the seat fixing part 500 is further provided with a button 530, which can be pressed to disengage the engaging hook 510 from the engaging protrusion 240. Of course, this disclosure is not limited to this, and the seat fixing part 500 may also be provided with other operating components, as long as they can disengage the engaging hook 510 from the engaging protrusion 240.

[0099] Since the features of this disclosure can be embodied in various forms without departing from the nature of this disclosure, it should also be understood that the above embodiments are not limited to any of the details described above, and unless otherwise stated, should be broadly interpreted as falling within the scope defined by the appended claims. Therefore, all modifications and alterations falling within the scope and limits of the claims or equivalents thereof should be covered by the appended claims.

Claims

1. A folding mechanism of an armrest of a child car seat, characterized in that, the child car seat comprises an upper frame, a lower frame and an armrest, the upper frame, the lower frame and the armrest are pivoted together by the folding mechanism of the armrest, the folding mechanism of the armrest comprises: a first connecting member connected with the upper frame; a second connecting member connected with the lower frame; a third connecting member connected with the armrest; the first connecting member, the second connecting member and the third connecting member are connected by a connecting shaft to be rotatable relative to each other around a central axis, wherein the first connecting member is provided with a clamping member being translatable, the clamping member comprises a protruding portion; wherein the second connecting member is provided with a first sliding groove extending curvedly around the central axis and a clamping hole in communication with one end of the first sliding groove, the third connecting member is provided with a second sliding groove extending curvedly around the central axis and a positioning hole in communication with one end of the second sliding groove, the radial positions of the first sliding groove and the second sliding groove correspond to each other, the radial positions of the clamping hole and the positioning hole correspond to each other, and the protruding portion can penetrate into the clamping hole and the positioning hole and can slide along the first sliding groove and the second sliding groove; wherein the radial width of the clamping hole and the positioning hole is set to be greater than the radial width of the first sliding groove and the second sliding groove and allows the clamping member to be translated radially between a locking position and a release position, when the protruding portion penetrates into the clamping hole and the positioning hole and is in the locking position, the protruding portion prevents the relative rotation between the first connecting member and the second connecting member, and prevents the relative rotation between the third connecting member and the first connecting member and the second connecting member, when the clamping member is translated to the release position, the relative rotation between the first connecting member and the second connecting member is allowed, and the relative rotation between the third connecting member and the first connecting member and the second connecting member is allowed. 2.A folding mechanism of an armrest of a child car seat, characterized in that, the child car seat comprises an upper frame, a lower frame and an armrest, the upper frame, the lower frame and the armrest are pivoted together by the folding mechanism of the armrest, the folding mechanism of the armrest comprises: a first connecting member connected with the upper frame; a second connecting member connected with the lower frame; a third connecting member connected with the armrest; the first connecting member, the second connecting member and the third connecting member are connected by a connecting shaft to be rotatable relative to each other around a central axis, wherein the second connecting member is provided with a clamping member being translatable, the clamping member comprises a protruding portion protruding towards both sides of the second connecting member, and the second connecting member is provided with a through hole for the protruding portion to penetrate through. The first connecting member is provided with a first connecting member sliding groove curvedly extending around the central axis and a first connecting member engaging hole in communication with one end of the first connecting member sliding groove, and the third connecting member is provided with a second sliding groove curvedly extending around the central axis and a positioning hole in communication with one end of the second sliding groove. The radial positions of the first connecting member sliding groove and the second sliding groove correspond to each other, the radial positions of the first connecting member engaging hole, the through hole and the positioning hole correspond to each other, and the protruding portion can penetrate into the first connecting member engaging hole and the positioning hole and can slide along the first connecting member sliding groove and the second sliding groove; The radial widths of the first connecting member engaging hole, the through hole and the positioning hole are greater than the radial widths of the first connecting member sliding groove and the second sliding groove and allow the engaging member to translate radially between a locking position and an unlocking position, When the protruding portion penetrates into the first connecting member engaging hole and the positioning hole and is in the locking position, the protruding portion prevents relative rotation between the first connecting member and the second connecting member and prevents relative rotation between the third connecting member and the first connecting member and the second connecting member, When the engaging member is translated to the unlocking position, relative rotation between the first connecting member and the second connecting member is allowed, and relative rotation between the third connecting member and the first connecting member and the second connecting member is allowed.

3. The folding mechanism according to claim 1 or 2, wherein The armrest folding mechanism is further provided with an unlocking member which can be operated to drive the engaging member to translate to the unlocking position.

4. The armrest folding mechanism of claim 3, wherein The unlocking member is a steel wire, one end of which is connected to the engaging member and the other end of which is connected to an operating portion located on the upper frame.

5. The folding mechanism according to claim 1 or 2, wherein The armrest folding mechanism is further provided with a first elastic member which drives the engaging member to translate to the locking position.

6. The armrest folding mechanism of claim 1, wherein When the engaging member is in the locking position, the protruding portion is located in the engaging hole in a position deviating from the first sliding groove and cannot enter the first sliding groove, thereby preventing relative rotation between the first connecting member and the second connecting member, and the protruding portion is located in the positioning hole in a position deviating from the second sliding groove and cannot enter the second sliding groove, thereby preventing relative rotation between the third connecting member and the first connecting member and the second connecting member.

7. The armrest folding mechanism of claim 2, wherein When the engaging member is in the locking position, the protruding portion is located in the first connecting member engaging hole in a position deviating from the first connecting member sliding groove and cannot enter the first connecting member sliding groove, thereby preventing relative rotation between the first connecting member and the second connecting member, and the protruding portion is located in the positioning hole in a position deviating from the second sliding groove and cannot enter the second sliding groove, thereby preventing relative rotation between the third connecting member and the first connecting member and the second connecting member.

8. The folding mechanism according to claim 1 or 2, wherein The third connecting member is provided with a reinforcing protrusion on the periphery thereof, and the second connecting member is provided with an abutting surface at a corresponding position of the periphery thereof, and the reinforcing protrusion can abut against the abutting surface to limit rotation of the third connecting member relative to the second connecting member.

9. The mechanism according to claim 1 or 2, wherein The armrest folding mechanism further comprises a seat fixing part which is fixed to the first connecting part and can be engaged to a bearing part provided on the frame, so that the child car seat can be detachably arranged on the frame; The seat fixing part is provided with a clamping hook, and the bearing part is provided with a clamping protrusion, the clamping hook can be engaged with or disengaged from the clamping protrusion, so as to prevent the seat fixing part from being disengaged from the bearing part or allow the seat fixing part to be disengaged from the bearing part.

10. The armrest folding mechanism of claim 9, wherein, The seat fixing part is further provided with a button which can be pressed to drive the clamping hook to disengage from the clamping protrusion.

11. A child's vehicle characterised by The child car adopts the armrest folding mechanism of the child car seat according to any one of claims 1 to 10.

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