Armrest folding mechanism of child car seat and child car

Abstract

The present disclosure describes an armrest folding mechanism for a child car seat and a child car. The child car seat includes an upper frame, a lower frame, and an armrest, which are pivotally connected together by an armrest folding mechanism. The armrest folding mechanism includes a first connecting member, a second connecting member, and a third connecting member, which are connected to rotate relative to each other. The first connecting member is provided with a snap-fit ​​member including a protrusion; the second connecting member is provided with a first slide and a snap-fit ​​hole; the third connecting member is provided with a second slide and a positioning hole, and the protrusion can be inserted into the snap-fit ​​hole and the positioning hole and can slide along the first slide and the second slide; the snap-fit ​​hole and the positioning hole are configured to allow the snap-fit ​​member to translate radially between a locked position and a released position, thereby allowing and preventing the first, second, and third connecting members from rotating relative to each other. The armrest folding mechanism according to the present disclosure enables the armrests to be synchronously folded when the child car seat is in a folded state.

Description

Technical Field

[0001] The present disclosure relates to the field of children's vehicles, and more particularly to a folding mechanism for a children's vehicle seat armrest and the children's vehicle. Background Art

[0002] Usually, such as Figure 1 As shown, a child stroller includes a child car seat 1 and a frame 2 that supports the child car seat 1. If the child car seat 1 and frame 2 are detachable, the child car seat 1, after being detached from the frame 2, is preferably foldable for storage. In this case, the armrests on the child car seat 1 also need to be folded simultaneously. However, because the locking mechanism for the armrests often differs from the locking mechanism for folding the child car seat 1, the structure of the entire child car seat 1 is relatively complex, making the child stroller difficult to manufacture and operate. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a novel folding mechanism for the armrest of a child car seat, which can overcome the above-mentioned technical problems.

[0004] As embodied and generally described herein, in order to achieve these and other advantages and in accordance with the purposes of the present disclosure, an armrest folding mechanism for a child car seat is provided, the child car seat comprising 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 comprising: a first connecting member connected to the upper frame; a second connecting member connected to the lower frame; a third connecting member connected to the armrest; the first connecting member, the second connecting member and the third connecting member being connected by a connecting shaft so as to be rotatable relative to each other around a central axis, wherein the first connecting member is provided with a translationally movable engaging member, the engaging member comprising a protrusion; In the embodiment, the second connecting member is provided with a first slide groove extending and bending around the central axis and a locking hole connected with one end of the first slide groove, the third connecting member is provided with a second slide groove extending and bending around the central axis and a positioning hole connected with one end of the second slide groove, the radial positions of the first slide groove and the second slide groove correspond to each other, the radial positions of the locking hole and the positioning hole correspond to each other, and the protrusion can penetrate the locking hole and the positioning hole and can slide along the first slide groove and the second slide groove; wherein the radial width of the locking hole and the positioning hole is set to be larger than the radial width of the first slide groove and the second slide groove and allows the locking member to translate radially between the locking position and the release 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 deviates from the first slide slot and the second slide slot and cannot enter the first slide slot and the second slide slot, thereby preventing the first connecting member, the second connecting member and the third connecting member 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 aligns with the first slide slot and the second slide slot and can enter the first slide slot and the second slide slot for sliding, thereby allowing the first connecting member, the second connecting member and the third connecting member to rotate relative to each other.

[0005] 14. The child stroller of claim 13, wherein the first and second child seats are configured to engage a plurality of locking members, each of which is configured to engage a plurality of locking members, each of which is configured to engage a plurality of locking members, each of which is configured to engage a plurality of locking members. and a second end of the first coupling member connected to the locking cam and to the locking cam.

[0006] In one embodiment, the armrest folding mechanism is further provided with a first elastic member, and the first elastic member drives the engaging member to translate to the locking position.

[0007] In one embodiment, the armrest folding mechanism is further provided with a release member, and the release member can be operated to drive the engaging member to translate to the release position.

[0008] In one embodiment, the release member is a steel wire, one end of the steel wire is connected to the engaging member, and the other end is connected to the operating portion located on the upper frame.

[0009] In one embodiment, a reinforcing protrusion is provided on the periphery of the third connecting member, and an abutment surface is provided at a corresponding position on the periphery of the second connecting member. The reinforcing protrusion can abut against the abutment surface to limit the rotation of the third connecting member relative to the second connecting member.

[0010] In one embodiment, the armrest folding mechanism is further provided with a seat fixing portion, which is fixed to the first connecting member and can be engaged with a load-bearing portion provided on the frame, so that the child car seat can be detachably placed on the frame.

[0011] In one embodiment, the seat fixing portion is provided with a snap hook, and the load-bearing portion is provided with a snap protrusion, and the snap hook can engage with or disengage with the snap protrusion to prevent the seat fixing portion from being separated from the load-bearing portion or allow the seat fixing portion to be separated from the load-bearing portion.

[0012] In one embodiment, the seat fixing portion is further provided with a second elastic member, and the second elastic member drives the engaging hook to engage with the engaging protrusion.

[0013] In one embodiment, the seat fixing portion is further provided with a button, which can be pressed to drive the engaging hook to disengage from the engaging protrusion.

[0014] In another embodiment, the present disclosure provides a baby stroller, which adopts the aforementioned armrest folding mechanism of the baby stroller seat.

[0015] The beneficial effect of the present disclosure is that the folding mechanism of the child stroller seat armrest according to the present disclosure can ensure that when the child stroller seat is in the unfolded state, the armrest is in the use position; when the child stroller seat is in the folded state, the armrest can be folded synchronously. Moreover, the structure of the child stroller is simpler and easier to operate.

[0016] The foregoing and other objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of the present disclosure when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification. The accompanying drawings illustrate embodiments of the disclosure and together with the description serve to explain the concept of the disclosure.

[0018] In the attached figure:

[0019] Figure 1 It is a perspective view of a child stroller including a child stroller seat and a stroller frame.

[0020] Figure 2 yes Figure 1 A perspective view of a child car seat is shown.

[0021] Figure 3 It is a three-dimensional diagram of the armrest folding mechanism according to the present invention in a locked state.

[0022] Figure 4 yes Figure 3 A partially exploded perspective view of the armrest folding mechanism shown.

[0023] Figure 5 yes Figure 3 The illustrated perspective view of the armrest folding mechanism is shown after the third connecting member is removed.

[0024] Figure 6 yes Figure 5 A three-dimensional diagram of the armrest folding mechanism in the unlocked state is shown in FIG.

[0025] Figure 7 It is a three-dimensional view of the third connecting member of the armrest folding mechanism according to the present disclosure.

[0026] Figure 8 is a cross-sectional view of the armrest folding mechanism according to the present disclosure.

[0027] Figure 9 yes Figure 2 Schematic diagram of the child car seat in the unfolded state.

[0028] Figure 10 yes Figure 2 Schematic diagram of the child car seat in the folded state.

[0029] Figure 11 yes Figure 2 Schematic diagram of the child car seat shown in a further folded state.

[0030] Figure 12 It is a three-dimensional view from another angle of the armrest folding mechanism according to the present disclosure, showing the situation where the reinforcing protrusion abuts against the abutting surface.

[0031] Figure 13 It is along Figure 1 A sectional view taken along line 'II' in FIG. 1 , showing the engagement of the locking hook with the locking protrusion.

[0032] Figure 14 It is along Figure 1 A sectional view taken along line 'II' of FIG. 1 , showing a situation where the engaging hook is disengaged from the engaging protrusion.

[0033] Reference Signs List

[0034] 1 child car seat

[0035] 11 upper frame

[0036] 12 Lower frame

[0037] 13 armrests

[0038] 14 Operation Department

[0039] 2 Children's bicycle frame

[0040] 21 bearing part

[0041] 240 snap-fit ​​protrusion

[0042] 100 first connecting piece

[0043] 101 first connection part

[0044] 110 snap-fit ​​parts

[0045] 111 protrusion

[0046] 120 first elastic member

[0047] 130 release piece

[0048] 200 second connecting piece

[0049] 201 second connection part

[0050] 210 first chute

[0051] 220 snap-in hole

[0052] 230 contact surface

[0053] 300 third connecting piece

[0054] 301 connection slot

[0055] 310 second chute

[0056] 320 positioning hole

[0057] 330 reinforced protrusion

[0058] 400 connecting shaft

[0059] 500 seat fixing part

[0060] 510 snap hook

[0061] 520 second elastic member

[0062] 530 button

[0063] W210 radial width of the first chute

[0064] W220 radial width of the engagement hole

[0065] W310 radial width of the second chute

[0066] W320 radial width of positioning hole DETAILED DESCRIPTION

[0067] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings.

[0068] like Figure 2 As shown, the child car seat 1 of the child car according to the present disclosure includes an upper frame 11, a lower frame 12 and an armrest 13, and the upper frame 11, the lower frame 12 and the armrest 13 are pivotally connected together through an armrest folding mechanism so that the three can pivot with each other and be folded up.

[0069] Figure 3 The armrest folding mechanism according to the present invention is shown, which includes a first connecting member 100, a second connecting member 200 and a third connecting member 300, which are connected by a connecting shaft 400 (at Figure 8 ) are connected so as to be rotatable relative to each other about a central axis.

[0070] The first connecting member 100 is connected to the upper frame 11, the second connecting member 200 is connected to the lower frame 12, and the third connecting member 300 is connected to the armrest 13. Since the first connecting member 100, the second connecting member 200 and the third connecting member 300 can rotate relative to each other, the upper frame 11, the lower frame 12 and the armrest 13 connected thereto can pivot relative to each other. This connection can be fixed or detachable. For example, Figure 3 In the embodiment, the first connecting member 100 extends a first connecting portion 101 for fixed connection to the upper frame 11; the second connecting member 200 extends a second connecting portion 201 for fixed connection to the lower frame 12; and the third connecting member 300 has a connecting groove 301 on its outer end surface facing away from the second connecting member 200 for detachably connecting to the armrest 13. However, the present disclosure is not limited thereto.

[0071] In addition, although the first connecting member 100, the second connecting member 200 and the third connecting member 300 shown in the figures are disc-shaped, they may also take other shapes.

[0072] Hereinafter, a detailed description will be given of how the armrest folding mechanism according to the present disclosure enables the child car seat 1 to be transformed between the deployed state and the folded state and to be maintained in the deployed state.

[0073] In order to achieve the above functions, it is necessary to enable the upper frame 11 and the lower frame 12 of the child car seat 1 to pivot relative to each other and to maintain a certain pivot angle, for example Figure 2-Figure 5 That is, the first connecting member 100 and the second connecting member 200 need to be able to rotate relative to each other and also be locked to each other and not rotate. Figure 4As shown, the first connecting member 100 is connected to a snap-fit ​​member 110, so that the snap-fit ​​member can translate between a locked position and a released position relative to the first connecting member 100, but cannot rotate relative to the first connecting member 100. The snap-fit ​​member 110 includes a protrusion 111. Correspondingly, the second connecting member 200 is provided with a first slide groove 210 extending and bending around the central axis and a snap-fit ​​hole 220 connected to one end of the first slide groove 210. The protrusion 111 can penetrate the snap-fit ​​hole 220 and can slide along the first slide groove 210, as shown in FIG. Figure 5 and Figure 6 The extension arc of the first sliding groove 210 can be approximately 180° or slightly less than 180°, thereby allowing the upper frame 11 connected to the first connecting member 100 and the lower frame 12 connected to the second connecting member 200 to be folded to the greatest extent.

[0074] like Figure 6 As shown, the radial width W220 of the engaging hole 220 is greater than the radial width W210 of the first sliding groove 210, and the radial width W220 of the engaging hole 220 should be set to allow the engaging member 110 to translate radially between the locking position and the releasing position after the protrusion 111 penetrates the engaging hole 220, thereby realizing the locking and releasing of the relative rotation between the first connecting member 100 and the second connecting member 200 by the engaging member 110.

[0075] Specifically, when the engaging member 110 is translated to the locking position, Figure 5 As shown, the protrusion 111 is located in the engaging hole 220 at a position deviating from the first slide groove 210 and cannot enter the first slide groove 210, thereby preventing the first connecting member 100 and the second connecting member 200 from rotating relative to each other. At this time, the child car seat 1 remains in the unfolded state. Figure 9 .

[0076] When the engaging member 110 is translated to the unlocking position, the protrusion 111 moves to the position aligned with the first sliding groove 210 in the engaging hole 220 and can enter the first sliding groove 210 to slide. Figure 6 As shown, the first connecting member 100 and the second connecting member are allowed to rotate relative to each other. At this time, the child car seat 1 can be transformed between the unfolded state and the folded state. Figure 10 and Figure 11 .

[0077] In the present disclosure, the engaging member 110 can be provided on the first connecting member 100 in various common ways. For example, a guide rail for guiding the engaging member 110 can be provided on one end surface of the first connecting member 100; or two long slots can be provided on the engaging member 110 to pass through the engaging member 110, and the two long slots can guide the translation of the engaging member 110, one of which can be provided for the connecting shaft 400 to pass through, and the other can be provided for the pin that connects the engaging member 110 to the first connecting member 100 to pass through; or, only one long slot can be provided on the engaging member 110 for the connecting shaft 400 to pass through, and the other long slot can be provided on the first connecting member 100 to pass through the pin that connects the engaging member 110 to the first connecting member 100 to pass through.

[0078] In the present disclosure, various common methods can be adopted to achieve the translation of the engaging member 110 relative to the first connecting member 100. For example, the engaging member 110 has an operating rod (not shown) extending from the armrest folding mechanism, and the translation of the engaging member 110 is achieved by toggling the operating rod. The armrest folding mechanism is also provided with a first elastic member 120, which drives the engaging member 110 to translate to the locked position. The first elastic member 120 can be a compression spring, a leaf spring or an elastic body. It should be understood that although Figure 4 In the preferred embodiment shown, the first elastic member 120 is disposed on the first connecting member 100. However, the first elastic member may also be disposed at other locations of the armrest folding mechanism. For example, if the engaging member is disposed on the second connecting member 200, the first elastic member may be disposed on the second connecting member 200. More preferably, the armrest folding mechanism is further provided with a release member 130, which can be operated to cause the engaging member 110 to translate to an unlocked position. To facilitate folding the child car seat, the release member 130 may be a steel wire, one end of which is connected to the engaging member 110 and the other end to the operating portion 14 located on the upper frame 11. When the user operates the operating portion 14, the steel wire is pulled, thereby causing the engaging member 110, which is connected to one end of the steel wire, to translate. Of course, the present disclosure is not limited to this.

[0079] Next, a detailed description will be given of how the armrest folding mechanism according to the present disclosure enables the armrests 13 of the child car seat 1 to be synchronously folded and maintained in the use position.

[0080] In order to achieve this function, the armrest 13 of the child car seat 1 needs to be able to pivot relative to the upper frame 11 and the lower frame 12 and to maintain a certain pivot angle. In other words, the third connecting member 300 needs to be able to rotate relative to the first connecting member 100 and the second connecting member 200, and also be locked to prevent rotation. Figure 7As best seen, the end surface of the third connector 300 facing the second connector 200 is also provided with a second slide groove 310 extending and curving about the central axis, and a positioning hole 320 communicating with one end of the second slide groove 310. The protrusion 111 of the engaging member 110 can also be inserted into the positioning hole 320 and slide along the second slide groove 310. The extension arc of the second slide groove 310 can be equal to or less than that of the first slide groove 210, but is preferably greater than the angle between the armrest 13 and the lower frame 12 in the deployed state, thereby allowing for maximum folding between the armrest 13 connected to the third connector 300 and the lower frame 12 connected to the second connector 200.

[0081] 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 correspond to each other. 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 to allow the engaging member 110 to translate radially between the locking position and the releasing position after the protrusion 111 penetrates the positioning hole 320, so that the engaging member 110 can also lock and release the relative rotation between the third connecting member 300 and the first connecting member 100 and the second connecting member 200.

[0082] 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 is away from the second slide groove 310 and cannot enter the second slide groove 310, thereby preventing the third connecting member 300 from rotating relative to the first connecting member 100 and the second connecting member 200. At this time, the armrest 13 connected to the third connecting member 300 remains in the use position, as shown in FIG. Figure 9 shown.

[0083] When the engaging member 110 is translated to the unlocking position, the protrusion 111 moves to the position aligned with the second slide groove 310 in the positioning hole 320 and can enter the second slide groove 310 to slide, thereby allowing the third connecting member 300 to rotate relative to the first connecting member 100 and the second connecting member 200. At this time, the armrest 13 connected to the third connecting member 300 can be folded synchronously, as shown in FIG. Figure 10 and Figure 11 shown.

[0084] Through the above arrangement, the armrest folding mechanism according to the present disclosure can ensure that the armrest 13 is in the use position when the child car seat 1 is in the unfolded state, and the armrest 13 can be folded synchronously when the child car seat 1 is in the folded state. Moreover, the structure is simpler and easier to operate.

[0085] Of course, the above description of the armrest folding mechanism according to the present disclosure uses the example of the engagement member 110 being connected to the first connector 100, but the present disclosure is not limited thereto. In a variation, the engagement member can be connected to the second connector 200. In this variation, the structures of the first connector 100 and the second connector 200 are modified, while the structure of the third connector 300 remains unchanged.

[0086] Specifically, the engaging member can be connected to either side of the second connector 200, such that the engaging member can translate relative to the second connector 200 between a locked position and a released position, but cannot rotate relative to the second connector 200. The engaging member includes protrusions protruding toward both sides of the second connector 200. Furthermore, the second connector 200 is provided with a through hole for the protrusions to pass through, so that no matter which side of the second connector 200 the engaging member is connected to, the protrusions of the engaging member can protrude into the first connector 100 and the third connector 300.

[0087] Correspondingly, the first connecting member 100 is provided with a first connecting member sliding groove that bends and extends around the central axis, and a first connecting member engaging hole that is connected to one end of the first connecting member sliding groove.

[0088] The radial positions of the first connector groove of the first connector 100 and the second groove of the third connector 300 correspond to each other, the radial positions of the first connector engagement hole of the first connector 100, the through hole of the second connector 200 and the positioning hole of the third connector 300 correspond to each other, and the protrusion can penetrate into the first connector engagement hole and the positioning hole and can slide along the first connector groove and the second groove.

[0089] The radial width of the first connecting member's engaging hole, through hole and positioning hole is set to be larger than the radial width of the first connecting member's sliding groove and the second sliding groove and allows the engaging member to translate radially between the locking position and the releasing position, thereby realizing that the engaging member allows and prevents the first connecting member 100, the second connecting member 200 and the third connecting member 300 from rotating relative to each other.

[0090] Several specific embodiments of the armrest folding mechanism according to the present disclosure will be described below. These embodiments can make the use of the baby stroller more reliable and convenient.

[0091] In one embodiment, in order to strengthen the positioning of the armrest 13 in the use position, as shown in FIG. Figure 12As shown, a reinforcing protrusion 330 may be provided on the periphery of the third connecting member 300, and an abutment surface 230 may be provided at a corresponding position on the periphery of the second connecting member 200. When the armrest 13 is used as a handle and pulled upward, the reinforcing protrusion 330 will abut against the abutment surface 230 to limit the rotation of the third connecting member 300 relative to the second connecting member 200, thereby reinforcing the positioning of the armrest 13.

[0092] In another embodiment, when the child car seat 1 and the frame 2 are detachable, in order to facilitate the placement of the child car seat 1 on the frame 2 and the removal of the child car seat 1 from the frame 2, the armrest folding mechanism may further include a seat fixing portion 500, which is fixed to the first connecting member 100 and can be engaged with the bearing portion 21 provided on the frame 2, such as Figure 13 and Figure 14 As shown, the child vehicle seat can be detachably mounted on the vehicle frame.

[0093] Furthermore, to prevent the seat fixing portion 500 from accidentally detaching from the supporting portion 21 and causing the risk of separation of the child car seat 1 and the vehicle frame 2, the seat fixing portion 500 may be provided with a locking hook 510 and the supporting portion 21 may be provided with a locking protrusion 240; or conversely, the seat fixing portion 500 may be provided with a locking protrusion 240 and the supporting portion 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 portion 500 from detaching from the supporting portion 21 or allow the seat fixing portion 500 to detach from the supporting portion 21.

[0094] exist Figure 13 and Figure 14 In the example shown, the engaging hook 510 can pivot to achieve engagement or disengagement with the engaging protrusion 240. However, the present disclosure is not limited thereto, and the engaging hook 510 can also translate left and right, or the engaging protrusion 240 can move, so as to achieve engagement or disengagement between the two.

[0095] To make the operation easier, the seat fixing portion 500 may further be provided with a second elastic member 520, which drives the engaging hook 510 to engage with the engaging protrusion 240. The second elastic member 520 may be a tension spring, a leaf spring, or an elastic body.

[0096] In a more preferred embodiment, the seat fixing portion 500 is further provided with a button 530 that can be pressed to disengage the engaging hook 510 from the engaging protrusion 240. Of course, the present disclosure is not limited thereto, and the seat fixing portion 500 may also be provided with other operating components as long as they can disengage the engaging hook 510 from the engaging protrusion 240.

[0097] Since the features of the present disclosure can be embodied in various forms without departing from the characteristics of the present disclosure, it should also be understood that the above embodiments are not limited to any details described above, unless otherwise noted, but should be broadly interpreted as being within the scope defined by the appended claims. Therefore, all modifications and variations that fall within the scope and limits of the claims or the equivalents of such scope and limits should be covered by the appended claims.

Claims

1. An armrest folding mechanism for a child car seat, characterized in that: The child car seat comprises an upper frame, a lower frame and an armrest, wherein the upper frame, the lower frame and the armrest are pivotally connected together via the armrest folding mechanism. The armrest folding mechanism comprises: a first connecting member connected to the upper frame; a second connecting member connected to the lower frame; a third connecting member connected to the handrail; The first connecting member, the second connecting member and the third connecting member are connected by a connecting shaft so as to be rotatable relative to each other around a central axis. Wherein, the first connecting member is provided with a locking member capable of translation, and the locking member includes a protrusion; The second connecting member is provided with a first sliding groove extending and bending around the central axis and a clamping hole communicating with one end of the first sliding groove; the third connecting member is provided with a second sliding groove extending and bending around the central axis and a positioning hole communicating 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 protrusion can penetrate the clamping hole and the positioning hole and can slide along the first sliding groove and the second sliding groove; The radial widths of the engaging hole and the positioning hole are set to be larger than the radial widths of the first sliding groove and the second sliding groove, and allow the engaging member to translate radially between a locking position and a releasing position. When the protrusion penetrates the engaging hole and the positioning hole and is in the locking position, the protrusion 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. The armrest folding mechanism is further provided with a release member, which can be operated to drive the engaging member to translate to the release position, thereby allowing relative rotation between the first connecting member and the second connecting member, and allowing relative rotation between the third connecting member and the first connecting member and the second connecting member. The release member is a steel wire, one end of which is connected to the engaging member, and the other end is connected to the operating portion located on the upper frame. The armrest folding mechanism is further provided with a seat fixing portion, which is fixed to the first connecting member and can be engaged with a bearing portion provided on the vehicle frame, so that the child car seat can be detachably placed on the vehicle frame.

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

3. The armrest folding mechanism according to claim 1, wherein: When the engaging member is in the locking position, the protrusion is located in the engaging hole at 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.

4. The armrest folding mechanism according to claim 3, wherein: When the engaging member is in the locking position, the protrusion is located in the positioning hole at a position deviating from the second sliding groove and cannot enter the second sliding groove, thereby preventing the third connecting member from rotating relative to the first connecting member and the second connecting member.

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

6. The armrest folding mechanism according to claim 1, wherein: The seat fixing portion is provided with a snap hook, and the carrying portion is provided with a snap protrusion. The snap hook can engage with or disengage from the snap protrusion to prevent the seat fixing portion from being separated from the carrying portion or allow the seat fixing portion to be separated from the carrying portion.

7. The armrest folding mechanism according to claim 6, wherein: The seat fixing portion is further provided with a button, which can be pressed to drive the engaging hook to disengage from the engaging protrusion.

8. An armrest folding mechanism for a child car seat, characterized in that: The child car seat comprises an upper frame, a lower frame and an armrest, wherein the upper frame, the lower frame and the armrest are pivotally connected together via the armrest folding mechanism. The armrest folding mechanism comprises: a first connecting member connected to the upper frame; a second connecting member connected to the lower frame; a third connecting member connected to the handrail; The first connecting member, the second connecting member and the third connecting member are connected by a connecting shaft so as to be rotatable relative to each other around a central axis. The second connecting member is provided with a locking member capable of translation, the locking member including protrusions protruding toward both sides of the second connecting member, and the second connecting member is provided with a through hole for the protrusion to pass through; wherein the first connecting member is provided with a first connecting member slot extending and bending around the central axis and a first connecting member engaging hole communicating with one end of the first connecting member slot; the third connecting member is provided with a second slot extending and bending around the central axis and a positioning hole communicating with one end of the second slot; the radial positions of the first connecting member slot and the second slot 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 protrusion is capable of penetrating the first connecting member engaging hole and the positioning hole and of sliding along the first connecting member slot and the second slot; The radial widths of the first connecting member engaging hole, the through hole and the positioning hole are set to be larger 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 the locking position and the unlocking position. When the protrusion penetrates the first connecting member engagement hole and the positioning hole and is in the locking position, the protrusion 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. The armrest folding mechanism is further provided with a release member, which can be operated to drive the engaging member to translate to the release position, thereby allowing relative rotation between the first connecting member and the second connecting member, and allowing relative rotation between the third connecting member and the first connecting member and the second connecting member. The release member is a steel wire, one end of which is connected to the engaging member, and the other end is connected to the operating portion located on the upper frame. The armrest folding mechanism is further provided with a seat fixing portion, which is fixed to the first connecting member and can be engaged with a bearing portion provided on the vehicle frame, so that the child car seat can be detachably placed on the vehicle frame.

9. The armrest folding mechanism according to claim 8, wherein: The armrest folding mechanism is further provided with a first elastic member, and the first elastic member drives the engaging member to translate to the locking position.

10. The armrest folding mechanism according to claim 8, wherein: When the engaging member is in the locking position, the protrusion is located in the engaging hole at a position deviating from the first connector slot and cannot enter the first connector slot, thereby preventing relative rotation between the first connector and the second connector.

11. The armrest folding mechanism according to claim 10, wherein: When the engaging member is in the locking position, the protrusion is located in the positioning hole at a position deviating from the second sliding groove and cannot enter the second sliding groove, thereby preventing the third connecting member from rotating relative to the first connecting member and the second connecting member.

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

13. The armrest folding mechanism according to claim 8, wherein: The seat fixing portion is provided with a snap hook, and the carrying portion is provided with a snap protrusion. The snap hook can engage with or disengage from the snap protrusion to prevent the seat fixing portion from being separated from the carrying portion or allow the seat fixing portion to be separated from the carrying portion.

14. The armrest folding mechanism according to claim 13, wherein: The seat fixing portion is further provided with a button, which can be pressed to drive the engaging hook to disengage from the engaging protrusion.

15. A children's vehicle, characterized in that: The child stroller adopts the armrest folding mechanism of the child stroller seat according to any one of claims 1 to 14.

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