CN116101356A - Armrest folding mechanism of baby carriage seat and baby carriage - Google Patents

Abstract

The present disclosure describes a handle fold mechanism for a child car seat and a child car, the child car seat comprising an upper frame, a lower frame and a handle, which are pivotally connected together by the handle fold mechanism, the handle fold mechanism comprising a first connector, a second connector and a third connector, which are connected to rotate relative to each other, wherein the first connector is provided with a snap-in member comprising a protrusion; 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 the clamping hole and the positioning hole and can slide along the first sliding groove and the second sliding groove; wherein the snap-fit and positioning holes are configured to allow the snap-fit member to translate radially between a locked position and a unlocked position to allow and prevent the first, second and third connectors from rotating relative to each other. The armrest folding mechanism realizes that the armrests can be synchronously folded when the child car seat is in a folded state.

Description

Armrest folding mechanism of baby carriage seat and baby carriage

Technical Field

The present disclosure relates to the field of child vehicles, and more particularly, to a folding mechanism for child vehicle seat armrests and a child vehicle.

Background

In general, as shown in fig. 1, a child car includes a child car seat 1 and a frame 2 carrying the child car seat 1. In the case where the child car seat 1 and the frame 2 are separable, the child car seat 1 with the frame 2 detached is preferably foldable for storage. At this time, the armrests on the child car seat 1 also need to be folded synchronously. However, since the latch structure of the armrest is often different from the latch structure of the child car seat 1, this results in a complicated structure of the entire child car seat 1, and thus makes it difficult to manufacture and operate the child car.

Disclosure of Invention

The present disclosure is directed to a novel folding mechanism for a child car seat armrest, which can overcome the above-mentioned technical problems.

To achieve these and other advantages and in accordance with the purpose of the present disclosure, as embodied and broadly described herein, there is provided a armrest folding mechanism of a 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 comprising: the first connecting piece is connected with the upper frame; the second connecting piece is connected with the lower frame; a third connecting piece connected with the armrest; the first connecting piece, the second connecting piece and the third connecting piece are connected through a connecting shaft to be capable of rotating relative to each other around a central axis, wherein the first connecting piece is provided with a clamping piece capable of translating, and the clamping piece comprises a protruding part; the second connecting piece is provided with a first sliding groove which extends around the central axis in a bending mode and a clamping hole which is communicated with one end of the first sliding groove, the third connecting piece is provided with a second sliding groove which extends around the central axis in a bending mode and a positioning hole which is communicated 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 part can penetrate the clamping hole and the positioning hole and can slide along the first sliding groove and the second sliding groove; the radial width of the clamping hole and the radial width of the positioning hole are larger than the radial width of the first chute and the radial width of the second chute, and the clamping piece is allowed to translate between a locking position and a unlocking position along the radial direction. With the snap member translated to the locked position, the protrusion moves to a position in the snap hole and the locating hole offset from the first and second runners without accessing the first and second runners, thereby preventing the first, second, and third connectors from rotating relative to each other; with the snap member translated to the release position, the protrusion moves to a position in the snap hole and the locating hole that aligns the first and second runners to be able to enter the first and second runners to slide, thereby allowing the first, second, and third connectors to rotate relative to one another.

In yet another aspect, the present disclosure provides an armrest folding mechanism for a child car seat, 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 comprising: the first connecting piece is connected with the upper frame; the second connecting piece is connected with the lower frame; a third connecting piece connected with the armrest; 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 about a central axis, wherein the second connecting member is provided with a translatable engaging member including protruding portions protruding toward both sides of the second connecting member, and the second connecting member is provided with through holes through which the protruding portions pass; the first connecting piece is provided with a first connecting piece sliding groove which extends in a bending mode around the central axis and a first connecting piece clamping hole communicated with one end of the first connecting piece sliding groove, the third connecting piece is provided with a second sliding groove which extends in a bending mode around the central axis and a positioning hole communicated with one end of the second sliding groove, the radial positions of the first connecting piece sliding groove and the second sliding groove correspond to each other, the radial positions of the first connecting piece clamping hole, the through hole and the positioning hole correspond to each other, and the protruding part can penetrate the first connecting piece clamping hole and the positioning hole and can slide along the first connecting piece sliding groove and the second sliding groove; the radial widths of the first connecting piece clamping hole, the through hole and the positioning hole are larger than those of the first connecting piece sliding groove and the second sliding groove, and the clamping piece is allowed to translate between a locking position and a unlocking position along the radial direction.

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

In one embodiment, the armrest folding mechanism is further provided with a lock release member operable to move the engaging member to the lock release position.

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

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

In one embodiment, the armrest folding mechanism is further provided with a seat fixing portion fixed to the first connecting member and engageable to a bearing portion provided on a vehicle frame, so that the child car seat is detachably provided on the vehicle frame.

In one embodiment, the seat fixing portion is provided with a snap hook, the carrying portion is provided with a snap projection, and the snap hook can be engaged with or disengaged from the snap projection to prevent or allow the seat fixing portion to be disengaged from the carrying portion.

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

In one embodiment, the seat fixing portion is further provided with a button that can be pressed to bring the engaging hook out of engagement with the engaging protrusion.

In another aspect, the present disclosure provides a stroller employing the armrest folding mechanism of the foregoing stroller seat.

The folding mechanism of the child car seat armrest has the beneficial effects that when the child car seat is in an unfolding state, the armrest is in a use position; when the child car seat is in a folded state, the armrests can be synchronously folded. Moreover, the structure of the buggy is simpler and easier to operate.

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.

Drawings

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

In the drawings:

fig. 1 is a perspective view of a child car including a child car seat and a frame.

Fig. 2 is a perspective view of the child car seat shown in fig. 1.

Fig. 3 is a perspective view of the armrest folding mechanism in a locked state according to the present disclosure.

Fig. 4 is a partially exploded perspective view of the armrest folding mechanism shown in fig. 3.

Fig. 5 is a perspective view of the armrest folding mechanism shown in fig. 3 with the third connector removed.

Fig. 6 is a perspective view of the armrest folding mechanism shown in fig. 5 in a release state.

Fig. 7 is a perspective view of a third connector of the armrest folding mechanism according to the present disclosure.

Fig. 8 is a cross-sectional view of a armrest folding mechanism according to the present disclosure.

Fig. 9 is a schematic view of the child car seat shown in fig. 2 in an unfolded state.

Fig. 10 is a schematic view of the child car seat shown in fig. 2 in a collapsed state.

Fig. 11 is a schematic view of the child car seat shown in fig. 2 in a further collapsed state.

Fig. 12 is another angular perspective view of the armrest folding mechanism according to the present disclosure, showing the stiffening protrusion abutting against the abutment surface.

Fig. 13 is a sectional view taken along line 'I-I' in fig. 1, showing the engagement of the snap hook with the snap projection.

Fig. 14 is a cross-sectional view taken along line 'I-I' of fig. 1, showing the snap hook disengaged from the snap projection.

List of reference numerals

1 child car seat

11 upper frame

12 lower frame

13 arm rest

14 operation part

2-child bicycle frame

21 bearing part

210 snap-fit protrusion

100 first connector

101 first connection portion

110 clamping piece

111 projection

120 first elastic member

130 release lock

200 second connector

201 second connection portion

210 first chute

220 snap hole

230 abutment surface

300 third connecting piece

301 connecting groove

310 second chute

320 locating hole

330 reinforcing protrusions

400 connecting shaft

500 seat fixing part

510 snap-fit hook

520 second elastic member

530 button

Radial width of W210 first chute

Radial width of W220 engagement hole

W310 radial width of second chute

Radial width of W320 locating hole

Detailed Description

The present disclosure will be described in detail below with reference to the accompanying drawings.

As shown in fig. 2, the child car seat 1 of the child car according to the present disclosure includes an upper frame 11, a lower frame 12, and armrests 13, and the upper frame 11, the lower frame 12, and the armrests 13 are pivoted together by an armrest folding mechanism so that the three can be pivoted to each other to be folded up.

Fig. 3 illustrates a handrail folding mechanism according to the present disclosure, which includes a first connector 100, a second connector 200, and a third connector 300, which are connected to be rotatable relative to each other about a central axis by a connecting shaft 400 (shown in fig. 8).

Wherein the first connector 100 is connected with the upper frame 11, the second connector 200 is connected with the lower frame 12, and the third connector 300 is connected with the armrest 13. Since the first, second and third links 100, 200 and 300 can be relatively rotated, the upper frame 11, the lower frame 12 and the armrest 13, which are respectively connected thereto, can be pivoted to each other. The connection may be fixed or removable. For example, in the embodiment of fig. 3, the first connecting member 100 extends out of the first connecting portion 101 for fixedly connecting with the upper frame 11; the second connecting piece 200 extends out of the second connecting portion 201, and is used for fixedly connecting with the lower frame 12; the outer end surface of the third connecting member 300 facing away from the second connecting member 200 is provided with a connecting groove 301 for detachably connecting with the armrest 13. However, the present disclosure is not limited thereto.

In addition, although the first, second and third connectors 100, 200 and 300 are shown as being disk-shaped, they may take other shapes.

Next, how the armrest folding mechanism according to the present disclosure achieves the shift between the unfolded state and the folded state of the child car seat 1 and can be maintained in the unfolded state will be described in detail.

In order to achieve the above-described function, 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 be held at a certain pivot angle, for example 180 ° as shown in fig. 2-5. That is, it is required that the first and second connectors 100 and 200 can be both rotated with respect to each other and locked to each other not to be rotated. To this end, as shown in fig. 4, a locking member 110 is connected to the first connector 100, such that the locking member can translate between a locking position and a unlocking position relative to the first connector 100, but cannot rotate relative to the first connector 100. The engaging member 110 includes a protruding portion 111. Correspondingly, the second connector 200 is provided with a first chute 210 extending around the central axis in a bending manner and an engaging hole 220 communicating with one end of the first chute 210. The protruding portion 111 can penetrate into the engagement hole 220 and can slide along the first chute 210, as shown in fig. 5 and 6. The first chute 210 may extend approximately 180 ° or slightly less than 180 ° in arc, allowing maximum collapse between the upper frame 11 connected to the first link 100 and the lower frame 12 connected to the second link 200.

As shown in fig. 6, the radial width W220 of the engaging hole 220 is greater than the radial width W210 of the first sliding slot 210, and the radial width W220 of the engaging hole 220 should be configured to allow the engaging member 110 to translate between the locking position and the unlocking position in the radial direction after the protrusion 111 penetrates the engaging hole 220, so as to lock and unlock the engaging member 110 with respect to the relative rotation between the first connecting member 100 and the second connecting member 200.

Specifically, in the case where the engaging member 110 is translated to the locking position, as shown in fig. 5, the protruding portion 111 is located at a position deviated from the first slide groove 210 in the engaging hole 220 so as not to enter the first slide groove 210, thereby preventing the first and second connection members 100 and 200 from rotating relative to each other. At this time, the child car seat 1 is kept in the unfolded state, see fig. 9.

With the snap member 110 translated to the unlocked position, the protrusion 111 moves to a position in the snap hole 220 aligned with the first runner 210 to be able to enter the first runner 210 for sliding, as shown in fig. 6, thereby allowing the first and second connectors 100 and 100 to rotate relative to each other. At this time, the child car seat 1 can be shifted between an unfolded state and a folded state, see fig. 10 and 11.

In the present disclosure, the engaging member 110 may be disposed on the first connector 100 in various conventional manners. For example, a guide rail for guiding the engaging member 110 may be provided on one side end surface of the first connector 100; alternatively, two long slots penetrating through the clamping member 110 are provided on the clamping member 110, and the two long slots guide the translation of the clamping member 110, wherein one long slot can be penetrated by the connecting shaft 400, and the other long slot can be penetrated by a pin for connecting the clamping member 110 to the first connecting member 100; alternatively, only one long slot hole is provided on the engaging member 110 for the connection shaft 400 to pass through, and the other long slot hole is provided on the first connecting member 100 for the pin connecting the engaging member 110 to the first connecting member 100 to pass through.

In this disclosure, translation of the snap member 110 relative to the first connector 100 may be accomplished in a variety of common ways. For example, the engaging member 110 has an operating lever (not shown) extending from the armrest folding mechanism, and the operating lever is moved to translate the engaging member 110. The armrest folding mechanism is further provided with a first elastic member 120, and the first elastic member 120 drives the clamping member 110 to translate to the locking position. The first elastic member 120 may be a compression spring, a leaf spring, an elastic body, or the like. It should be appreciated that although in the preferred embodiment shown in fig. 4, the first resilient member 120 is provided at the first connector 100, the first resilient member may also be provided at other locations of the armrest folding mechanism, for example, where the snap member is provided at the second connector 200, the first resilient member may be provided at the second connector 200. More preferably, the armrest folding mechanism is further provided with a release lock 130, and the release lock 130 can be operated to move the engaging member 110 to the release lock position. To facilitate folding of the child car seat, the release lock 130 may be a steel wire, one end of which is connected to the engaging member 110 and the other end of which is connected to the operating portion 14 of the upper frame 11, such that when the user operates the operating portion 14, the steel wire is pulled to translate the engaging member 110 connected to one end of the steel wire. Of course, the present disclosure is not limited thereto.

Next, how the armrest folding mechanism according to the present disclosure achieves synchronous folding of the armrest 13 of the child car seat 1 and is able to be held in the use position will be described in detail.

In order to achieve this function, it is necessary to enable the armrests 13 of the child car seat 1 to pivot with respect to the upper frame 11, the lower frame 12 and to be held at a certain pivot angle. That is, the third link 300 is required to be rotatable with respect to the first link 100 and the second link 200, and also to be locked to each other so as not to be rotatable. For this purpose, as best seen in fig. 7, a second sliding groove 310 extending in a curved manner around the central axis and a positioning hole 320 communicating with one end of the second sliding groove 310 are likewise provided on the end face of the third connecting piece 300 facing the second connecting piece 200. The protruding portion 111 of the engaging member 110 can also penetrate the positioning hole 320 and slide along the second sliding slot 310. The second chute 310 may have an extension arc equal to or less than that of the first chute 210, but is preferably greater than the angle of the armrest 13 to the lower frame 12 in the extended state, thereby allowing maximum collapse between the armrest 13 connected to the third link 300 and the lower frame 12 connected to the second link 200.

The radial positions of the first chute 210 and the second chute 310 correspond to each other, and the radial positions of the engaging hole 220 and the positioning hole 320 correspond to each other. Moreover, as shown in fig. 7, the radial width W320 of the positioning hole 320 is greater than the radial width W310 of the second chute 310, and the radial width W320 of the positioning hole 320 is also set to allow the latch 110 to translate between the locking position and the unlocking position in the radial direction after the protrusion 111 penetrates into the positioning hole 320, so that the latch 110 can be locked and unlocked with respect to the relative rotation between the third connector 300 and the first and second connectors 100 and 200.

Specifically, in the case that the engaging member 110 is translated to the locking position, the protrusion 111 moves to a position offset from the second sliding groove 310 in the positioning hole 320 without entering the second sliding groove 310, thereby preventing the relative rotation between the third connector 300 and the first and second connectors 100 and 200. At this time, the armrest 13 connected to the third link 300 is maintained at the use position as shown in fig. 9.

In the case that the engaging member 110 translates to the unlocking position, the protrusion 111 moves to a position aligned with the second sliding groove 310 in the positioning hole 320 to be able to enter the second sliding groove 310 to slide, thereby allowing the relative rotation between the third connector 300 and the first and second connectors 100 and 200. At this time, the armrest 13 connected to the third connector 300 may be simultaneously folded as shown in fig. 10 and 11.

With the above arrangement, the armrest folding mechanism according to the present disclosure can realize that the armrest 13 is in the use position when the child car seat 1 is in the unfolded state; the armrests 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.

Of course, the armrest folding mechanism according to the present disclosure has been described above by taking the way in which the engaging member 110 is connected to the first connecting member 100 as an example, but the present disclosure is not limited thereto. In one variation, the snap-fit member may be connected to the second connector 200. In this modification, the structures of the first and second connection members 100 and 200 are changed, and the structure of the third connection member 300 is unchanged.

In particular, the catch may be connected on either side of the second connector 200 such that the catch is translatable relative to the second connector 200 between a locked position and a unlocked position, but is not rotatable relative to the second connector 200. The engaging member includes protruding portions protruding toward both sides of the second connector 200, and the second connector 200 is provided with through holes through which the protruding portions pass, so that the protruding portions of the engaging member can protrude into the first connector 100 and the third connector 300 regardless of which side of the second connector 200 the engaging member is connected to.

Correspondingly, the first connector 100 is provided with a first connector sliding groove extending in a bending manner around the central axis and a first connector engaging hole communicating with one end of the first connector sliding groove.

The radial positions of the first link sliding groove of the first link 100 and the second sliding groove of the third link 300 correspond to each other, the radial positions of the first link engaging hole of the first link 100, the through hole of the second link 200 and the positioning hole of the third link 300 correspond to each other, and the protruding portion can penetrate the first link engaging hole and the positioning hole and can slide along the first link sliding groove and the second sliding groove.

The radial width of the first connector snap-in hole, the through hole and the positioning hole are set to be larger than the radial width of the first connector slide groove and the second slide groove and allow the snap-in member to translate between the locking position and the unlocking position in the radial direction, thereby realizing that the snap-in member allows and prevents the first connector 100, the second connector 200 and the third connector 300 from rotating relative to each other.

In the following, several specific embodiments of the armrest folding mechanism according to the present disclosure will be described, which can promote more reliable and convenient use of the child's vehicle.

In one embodiment, to enhance the positioning of the armrest 13 in the use position, as shown in fig. 12, a reinforcing protrusion 330 may be disposed on the periphery of the third connector 300, and an abutment surface 230 may be disposed at a corresponding position on the periphery of the second connector 200, such that when the armrest 13 is lifted upward as a handle, the reinforcing protrusion 330 will abut against the abutment surface 230 to limit the rotation of the third connector 300 relative to the second connector 200, thereby enhancing the positioning of the armrest 13.

In yet another embodiment, in the case where the child car seat 1 and the frame 2 are separable, in order to facilitate the placement of the child car seat 1 to the frame 2 and the detachment of the child car seat 1 from the frame 2, the armrest folding mechanism may be further provided with a seat fixing portion 500, the seat fixing portion 500 being fixed to the first link 100 and being engageable to a bearing portion 21 provided on the frame 2, as shown in fig. 13 and 14, so that the child car seat is detachably placed on the frame.

Further, in order to prevent the seat fixing portion 500 from being accidentally separated from the carrying portion 21, which may cause a risk of separation of the child car seat 1 and the frame 2, the seat fixing portion 500 may be provided with an engagement hook 510, and the carrying portion 21 may be provided with an engagement protrusion 210; or vice versa, the seat fixing portion 500 may be provided with the engaging protrusion 210, and the bearing portion 21 may be provided with the engaging hook 510. The engagement hook 510 can engage or disengage with the engagement protrusion 210 to prevent the seat fixing portion 500 from being disengaged from the carrier portion 21 or to allow the seat fixing portion 50 to be disengaged from the carrier portion 21.

In the example shown in fig. 13 and 14, the snap hook 510 is pivotable to effect engagement or disengagement with the snap projection 210. However, the present disclosure is not limited thereto, and the snap hooks 510 may be translated left and right, or the snap protrusions 210 may be moved so as to achieve engagement or disengagement of the two.

In order to facilitate the operation, 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 210. The second elastic member 520 may be an extension spring, a leaf spring, an elastic body, or the like.

In a more preferred example, the seat fixing part 500 is further provided with a button 530 that can be pressed to bring the engaging hook 510 out of engagement with the engaging protrusion 210. Of course, the present disclosure is not limited thereto, and the seat fixing portion 500 may be provided with other operating members as long as they can bring the engaging hooks 510 out of engagement with the engaging protrusions 210.

As the features of the present disclosure may be embodied in several forms without departing from the characteristics thereof, it should also be understood that the above-described embodiments are not limited to any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A folding mechanism of a handrail of a child car seat is characterized in that,

the child car seat comprises an upper frame, a lower frame and armrests, wherein the upper frame, the lower frame and the armrests are pivoted together through an armrest folding mechanism,

the armrest folding mechanism comprises:

the first connecting piece is connected with the upper frame;

the second connecting piece is connected with the lower frame;

a third connecting piece connected with the armrest;

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 about a central axis,

the first connecting piece is provided with a clamping piece capable of translating, and the clamping piece comprises a protruding part;

the second connecting piece is provided with a first sliding groove which extends around the central axis in a bending mode and a clamping hole which is communicated with one end of the first sliding groove, the third connecting piece is provided with a second sliding groove which extends around the central axis in a bending mode and a positioning hole which is communicated 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 part can penetrate the clamping hole and the positioning hole and can slide along the first sliding groove and the second sliding groove;

the radial width of the clamping hole and the radial width of the positioning hole are larger than the radial width of the first chute and the radial width of the second chute, and the clamping piece is allowed to translate between a locking position and a unlocking position along the radial direction.

2. A folding mechanism of a handrail of a child car seat is characterized in that,

the child car seat comprises an upper frame, a lower frame and armrests, wherein the upper frame, the lower frame and the armrests are pivoted together through an armrest folding mechanism,

the armrest folding mechanism comprises:

the first connecting piece is connected with the upper frame;

the second connecting piece is connected with the lower frame;

a third connecting piece connected with the armrest;

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 about a central axis,

the second connecting piece is provided with a clamping piece capable of translating, the clamping piece comprises protruding parts protruding towards two sides of the second connecting piece, and the second connecting piece is provided with through holes for the protruding parts to pass through;

the first connecting piece is provided with a first connecting piece sliding groove which extends in a bending mode around the central axis and a first connecting piece clamping hole communicated with one end of the first connecting piece sliding groove, the third connecting piece is provided with a second sliding groove which extends in a bending mode around the central axis and a positioning hole communicated with one end of the second sliding groove, the radial positions of the first connecting piece sliding groove and the second sliding groove correspond to each other, the radial positions of the first connecting piece clamping hole, the through hole and the positioning hole correspond to each other, and the protruding part can penetrate the first connecting piece clamping hole and the positioning hole and can slide along the first connecting piece sliding groove and the second sliding groove;

the radial widths of the first connecting piece clamping hole, the through hole and the positioning hole are larger than those of the first connecting piece sliding groove and the second sliding groove, and the clamping piece is allowed to translate between a locking position and a unlocking position along the radial direction.

3. The armrest folding mechanism according to claim 1 or 2, further comprising a first elastic member that urges the engagement member to translate to the locked position.

4. The armrest folding mechanism of claim 1 or 2 further comprising a release member operable to move the engagement member to the release position.

5. The armrest folding mechanism of claim 4 wherein said release member is a steel wire having one end connected to said engagement member and the other end connected to an operating portion located on said upper frame.

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

7. The armrest folding mechanism according to claim 1 or 2, characterized in that the armrest folding mechanism is further provided with a seat fixing portion that is fixed to the first connecting member and is engageable to a bearing portion provided on a vehicle frame so that the child car seat is detachably provided on the vehicle frame.

8. The armrest folding mechanism of claim 7, wherein the seat fixing portion is provided with a snap hook, and the carrier portion is provided with a snap projection, the snap hook being engageable with or disengageable from the snap projection to prevent or allow the seat fixing portion to disengage from the carrier portion.

9. The armrest folding mechanism of claim 8 wherein said seat securing portion is further provided with a button that can be depressed to disengage said snap hook from said snap projection.

10. A child car, characterized in that it employs the armrest folding mechanism of the child car seat according to any one of claims 1-9.

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