AU2018441134A1

AU2018441134A1 - Collapsible child seats

Info

Publication number: AU2018441134A1
Application number: AU2018441134A
Authority: AU
Inventors: Warren Anthony Appel; Joshua Lawrence Baker; Zili LIU; Paul Andrew Walker
Original assignee: ICANDY WORLD Ltd
Current assignee: ICANDY WORLD Ltd
Priority date: 2018-09-14
Filing date: 2018-09-14
Publication date: 2021-04-15
Also published as: CN114302842A; EP3849875A1; WO2020051872A1; CN114302842B; EP3849875A4

Abstract

A collapsible child seat (3) comprises an upper seat (12), a lower seat (13), and at least one mounting assembly (11) adapted for mounting on a frame (2) of a child transport device (1). The upper and lower seats (12,13) are movable between folded and open positions of the seat by actuation of a manually-operable member (15), and in the open position are movable into at least two orientations relative to each mounting assembly.

Description

COLLAPSIBLE CHILD SEATS

This invention relates to a collapsible child seat, in particular a collapsible child seat for use with a pushchair or buggy or other child transport device.

There are many known collapsible child seats for mounting on a pushchair. The seats may be mounted permanently or removably. It is also a requirement for pushchairs to be folded down into a small volume of convenient dimensions for easy storage at home, or in a vehicle. This folding may require the child seat to be folded as well, or it may simply be advantageous for easy storage for a removable child seat to be folded. The child seat then is formed from separate upper and lower seat elements, connected to an adapter or adapters by which the seat can be mounted on a pushchair or other device. Such a child seat will be able to adapt different positions on a pushchair, between reclined and upright. It will also typically have a restraining bar, which is mounted across the seat as a partial restraint for the child in use. The bar may also act as a carrying handle for the seat. Although such a bar may be removable, it is advantageous for it to fold with the seat.

It is also advantageous for the actions of positioning the seat and folding the seat to be easy, and preferably to be accomplished using just one hand, while avoiding inadvertent operation. Finally, the mechanisms to perform these functions should be compact and robust.

One known construction is shown in US 2018/0027989. It has a collapsible child seat with relatively movable seat and back elements and a restraining bar, all mounted on an adapter. A first locking mechanism locks the seat element to the adapter, and a second locking mechanism locks the back element to the seat element. A trigger is operated by the user to release the second locking mechanism to allow the back element to rotate relative to the seat element in order to recline the back or move it to an upright position. If the angle between the back and seat elements is reduced sufficiently, it releases the first locking mechanism to allow the seat element to rotate relative to the adapter, as well as allowing the back element to fold onto the seat element. A third locking mechanism locking the restraining bar to the seat is also released when the fist locking mechanism is released, so that the bar can fold in with the back element. The restraining bar is mounted on a different axis from the back and seat elements, so the construction of the locking mechanisms is relatively complex.

According to a first aspect of the invention, a collapsible child seat comprises an upper seat, a lower seat, and at least one mounting assembly adapted for mounting on a frame of a child transport device, the upper and lower seats being movable between folded and open positions of the seat by actuation of a manually-operable member, and in the open position being movable into at least two orientations relative to the or each mounting assembly, the or each mounting assembly comprising an adapter member adapted for engagement with the frame, an upper seat member on which the upper seat is mounted, a lower seat member on which the lower seat is mounted, a first lock member acting to lock the upper seat member to the lower seat member in the open position of the seat, and a second lock member acting to lock one of the seat members to the adapter member in the at least two orientations, the seat in the open position also being movable into an unlock orientation, the second lock member being released by actuation of the manually-operable member and the first lock member being released by engagement with the adapter member when the seat is in the unlock orientation.

This construction enables the seat to adapt different orientations, and is particularly easy to use, as the positioning and folding can be accomplished with just one hand, by operation of the manually-operable member, which releases both lock members. Unfolding the seat is also simple, with the locking into the open position happening automatically when the seat reaches the unlock orientation again.

The components of the or each mounting assembly are preferably mounted on a common axis, to provide a compact construction.

Conveniently, relative rotation of the upper and lower seat members is limited, in order to define the open position of the seat. The limiting means may be provided by at least one axially-extending pin, each pin being accommodated in a pair of overlapping circumferential apertures or grooves in the upper and lower seat members. Preferably two pins are provided, each being accommodated in a respective pair of overlapping circumferential apertures or grooves. This arrangement allows relative rotation of the upper and lower seat members up to 180°, so that the upper and lower seats can move between the open and folded positions of the seat.

With the seat in the open position the apertures or grooves have a minimum overlap, with the pins trapped between the ends of the apertures or grooves. As the upper seat member is unlocked from the lower seat member and folded towards it, the upper seat member will push the pins from one end of the groove or aperture to the other, to a position where the grooves or apertures overlap fully. When the seat is unfolded the upper seat member will push the pins in the opposition direction, and the overlap reduces, until the pins are trapped between the ends of the apertures or grooves, at minimum overlap.

The pin or pins may be mounted on a cover component which is also rotatable about the common axis. The cover component may also mount a restraining bar. Folding the seat automatically folds the restraining bar between the upper and lower seat members, and unfolding the seat into the open position automatically brings the restraining bar into an operative position where it is locked in place. This arrangement has a simple construction, and is very easy to operate.

Conveniently the first lock member has a toothed engagement with the upper and lower seat members, and is movable axially into and out of lock and release positions. The first lock member may be annular, with external teeth engaging with internal teeth in the upper and lower seat members. The first lock member has at least one internal cam surface for engagement with a corresponding external cam surface on an axial projection of the adapter member. Movement of the open seat towards the unlock orientation causes rotation of the first lock member relative to the adapter member and the cam surfaces engage to move the first lock member axially out of engagement with the upper seat member. A spring is provided to urge the first lock member into engagement with the upper seat member as the seat is unfolded into the open position.

The second lock member may have a toothed engagement with the upper seat member and the adapter member, and is movable axially into and out of lock and release positions. The second lock member is preferably annular, with external teeth engaging with internal teeth in the upper seat member and the adapter member.

A cable cam member is accommodated between the upper seat member and the second lock member. The cable cam member has an internal cam surface for engagement with a corresponding external cam surface on the upper seat member. Rotation of the cable cam member by the manually-operable member moves the second lock member axially out of engagement with the upper seat member. A spring is provided to urge the second lock member back into engagement with the upper seat member when the manually-operable member is released. The manually-operable member conveniently comprises a button acting to pull a cable attached to the cable cam member in order to rotate it.

According to a second aspect of the invention, a collapsible child seat comprises an upper seat, a lower seat, a restraining bar and at least one mounting assembly adapted for mounting on a frame of a child transport device, the upper and lower seats being movable between folded and open positions of the seat by actuation of a manually-operable member, the or each mounting assembly comprising an adapter member adapted for engagement with the frame, an upper seat member on which the upper seat is mounted, a lower seat member on which the lower seat is mounted and a restraining bar member on which the restraining bar is mounted, the restraining bar member having at least one pin accommodated in overlapping circumferentially extending apertures or grooves in the upper and lower seat members which are relatively rotatable, the arrangement being such that in the open position of the seat the overlap between the apertures or grooves of the upper and lower seat members is at a minimum and the pin is held between the ends of the apertures or grooves, and in movement of the seat between the open and folded positions the pin moves in the apertures or grooves.

This provides a simple construction which allows automatic folding of the restraining bar with the seat, and automatic movement of the restraining bar into the open position as the seat is opened, by movement of the pin in the overlapping apertures or grooves. The restraining bar is held securely in the open position by the upper and lower seat members.

The restraining bar member conveniently has a pair of pins, each pin working in a corresponding pair of overlapping apertures or grooves in the upper and lower seat members.

In the open position of the seat the upper and lower seat members are preferably locked by a lock member. When the lock member is released, the upper seat member can rotate towards the lower seat member. The ends of the apertures or grooves in the upper seat member will push the respective pins as the overlap between the apertures or grooves increases. When the seat is unfolded the upper seat member will push the pins in the opposite direction as the overlap reduces, until the position of minimum overlap is reached.

Each of the upper and lower seat members may have apertures in which the pins are accommodated, or one may have apertures, and the other corresponding grooves.

The restraining bar member may act as a cover member for the mounting assembly. Conveniently, the restraining bar member is rotatable relative to the adapter member.

An embodiment of a collapsible child seat according to all the aspects of the invention is illustrated, by way of example only, in the accompanying drawings, in which: -

Figure 1 is a perspective view of a pushchair including a collapsible child seat according to the invention;

Figure 2 is a perspective view of the seat without the fabric cover;

Figure 3 is an exploded view of the seat of Figure 2;

Figure 4 is a side view of an adapter member of a mounting assembly of the seat of Figure 1;

Figure 5 is a perspective view of the adapter member of Figure 4;

Figure 6 is a side view of an upper seat member of the mounting assembly;

Figure 7 is a perspective view of the upper seat member;

Figure 8 is a cross-section through the upper seat member along the line 8-8 of Figure 6;

Figure 9 is a side view of a lower seat member of the mounting assembly;

Figure 10 is an opposite side view of the lower seat member;

Figure 11 is a perspective view of the lower seat member;

Figure 12 is a side view of a first lock member of the mounting assembly;

Figure 13 is an opposite side view of the first lock member;

Figure 14 is a perspective view of the first lock member;

Figure 15 is a side view of a second lock member of the mounting assembly;

Figure 16 is an opposite side view of the second lock member;

Figure 17 is a perspective view of the second lock member;

Figure 18 is a side view of a cable cam member;

Figure 19 is an opposite side view of the cable cam member; and

Figure 20 is a perspective view of the cable cam member.

Figure 1 shows a pushchair 1 with a wheeled foldable frame 2 carrying a removable seat 3. The pushchair 1 can be folded by activating a button 4 on the handle 5. The seat 3 carries a hood 6, which can also be folded or removed, and a restraining bar 7. The seat 3 is collapsible, so that it can be folded with the frame 2. The seat 3 is removably mounted on mounting carriers 8 from the frame 3, so that it can be used to carry a child, or mounted on another child transport device.

Figures 2 and 3 show the seat 3 in more detail. It comprises a tubular seat frame 10 attached to a pair of mounting assemblies 11, one on each side of the tubular seat frame 10, and having a common axis. Each mounting assembly 11 can be removably mounted on a respective mounting carrier 8 on the frame 2. The restraining bar 7 is also attached to the mounting assemblies 11. The tubular seat frame 10 has upper and lower seats 12, 13 respectively, which are covered by fabric 9 (shown only in Figure 1. The hood 6 is mounted on the upper seat 12by a frame member 14. The upper and lower seats 12, 13 relatively rotatable about the axis of the mounting assemblies 11, between an open position of the seat 3 (as shown) and a folded position, in which the upper seat 12 is in contact with the lower seat 13, with the restraining bar 7 between them. In the open position the seat 3 is locked and is able to adopt different orientations on the pushchair frame 2. An upright orientation is shown in Figure 1, and in a reclining orientation the seat 3 is substantially parallel to the surface on which the pushchair 1 rests, with an intermediate orientation between them. An unlock orientation is also provided. A manually-operated button 15 on the upper seat 12 is activated to enable the seat 3 to move between the different orientations, and between the open and folded positions. The mounting assemblies 11 are constructed to control the movement of the seat 3 and to lock it in the different orientations and positions.

The mounting assemblies 11 are mirror images, and so only one will be described. As best seen in Figure 3, a mounting assembly 11 comprises an adapter 20 adapted for mounting on a carrier 8, an upper seat member 21 attached to the upper seat 12, a lower seat member 22 attached to the lower seat 13, a first lock member 23 adapted to lock the upper and lower seat members 21, 22, a second lock member 24 adapted to lock the upper seat member to the adapter 20, a cable cam member 25 activated by a cable 26 attached to the button 15, a cover member 27 to which the restraining bar 7 is attached, and a spindle 28 defining the axis of the assembly 11, and on which the components are mounted for rotation.

The adapter 20 (best seen in Figures 3 to 5) comprises an adapter member 30, together with an inner cover 31, a release member 32 and an outer cover 33. The adapter member 30 has a lower end 34 of substantially rectangular outline adapted to fit into the carrier 8, being retained by a manually operable catch (not shown) and an upper end 35 of circular outline. A substantially cylindrical hollow projection 36 extends axially inwardly from the centre of the upper end 35. A blind bore 37 within projection 36 is adapted to receive the spindle 28. The free end 38 of the projection 36 is of dumb-bell shape. The external surface of the projection 36 is formed with a pair of diametrally opposed cams 39, each of whose cam surface 40 is adapted to engage with cams on the first lock member 23, as explained below. The internal peripheral surface of the upper end 35 is formed with axially-extending teeth 41, adapted to engage with corresponding teeth on the second lock member 24 as explained below. The inner cover 31 is attached to the adapter member 30 by screws (not shown) .

As best shown in Figures 6 to 8, the upper seat member 21 is of generally annular outline, comprising a substantially cylindrical part 42 of stepped outline, from which extends a hollow cylindrical arm 43 to receive the tubular seat frame 10 of the upper seat 12. The part 42 comprises a first part 44 of larger diameter and a second part 45 of smaller diameter separated by an annular web 46. The first part 44, which faces outwards, is cylindrical and has internal teeth 47 formed round its periphery, for engagement with teeth on the second lock member 24, as explained below. Three cams 48 extend from the inner periphery of the annular web 46 within the first part 44. The diameter of the inner periphery is chosen to allow the projection 36 to pass freely. The cam surface 49 of each cam 48 is adapted to engage with a corresponding cam surface on the cable cam member 25. The second part 45, which faces inwards, has internal teeth 50 formed round its periphery, for engagement with teeth on the first lock member 23. The outer periphery is formed with two opposed circumferential grooves 51 forming part of a mechanism 52 limiting relative rotation of the upper and lower seat members 21, 22.

The lower seat member 22 is shown in Figures 9 to 11. It is also of generally annular outline, comprising a substantially cylindrical part 53 from which extends a hollow cylindrical arm 54 to receive the tubular seat frame 10 of the lower seat 13. A central aperture 55 is of dumb-bell shape to receive the free end 38 of the projection 36 on the adapter member 30. Internal teeth 56 are formed on an intermediate diameter, for engagement with teeth on the first lock member 23. A pair of opposed circumferential apertures 57 are formed in the outer periphery. These are part of the mechanism 52 limiting relative rotation of the upper and lower seat members 21, 22. The arrangement is such that each groove 51 on the upper seat member 21 can move from a position of minimum overlap with the corresponding aperture 57 defined by a pin77 (shown in phantom in Figures 6 and 9) accommodated in the groove and aperture, to a position where the groove 51 and aperture 57 are in registry. Because the pin can also move relative to the groove 51 and aperture 57, the relative rotation of the upper and lower seat members 21, 22 is nearly 180°, enabling the seat to move between the open and folded positions.

The first lock member 23 is shown in Figures 12 to 14. It is a gear-type component of generally annular outline. It has external teeth 60 corresponding to the internal teeth 56 on the lower seat member 22, and the internal teeth 50 on the upper seat member 21. Two diametrally opposed external teeth 61 have a greater circumferential extent, to ensure that the first lock member 23 can have only two orientations relative to the upper and lower seat members 21, 22. A central aperture 62 of the first lock member 23 is dumb-bell shaped to receive the free end 38 of the projection 36 on the adapter member 30. The aperture 62 also has two diametrically opposed internal cam surfaces 63 for engagement with the corresponding external cam surfaces 40 on the cams 39 on the projection 36. Relative rotation of the projection 36 and the first lock member 23 moves the first lock member 23 axially. The first lock member 23 is always received in the lower seat member 22, and moves axially into and out of engagement with the upper seat member 22. A spring (not shown) urges the first lock member 23 towards the adapter member 30. When the first lock member 23 is in engagement with the upper seat member 22 the upper and lower seat members 21, 22 are locked together against relative movement in the open position of the seat 3.

The second lock member 24 is shown in Figures 15 to 17. It is also a gear-type component of generally annular outline. It has external teeth 65 corresponding to the internal teeth 47 on the upper seat member 21 and the internal teeth 41 on the adapter member 30. It will be noted that it has two diametrically opposed teeth 66, 67 of a different form. The tooth 66 has a greater radial extent than the teeth 65, and the tooth 67 a greater circumferential extent. This means that the second lock member 24 can have only a single orientation relative to the upper seat member 21 and the adapter member 30. The central aperture 68 of the second lock member 24 is circular, and is dimensional to allow the projection 36 of the adapter member 30 to pass freely. The second lock member 24 is always received in the adapter member 30, and moves axially into and out of engagement with the upper seat member 21. When the second lock member 24 engages the upper seat member 21, it locks the upper seat member to the adapter member 30 to retain the seat 3 in a given orientation. The movement of the second lock member 24 is controlled by the cable cam member 25, which engages an inner axial face 69 of the second lock member 24, as explained below. A spring (not shown) urges the second lock member 24 towards the upper seat member 21.

The cable cam member 25 is shown in Figures 18 to 20. It is of stepped annular outline, with an outwardly-extending radial projection 70 having a groove 71 for guiding and anchoring the end of the cable 26. The central aperture 72 is formed with three cam profiles 73 spaced equally round the diameter, and corresponding to the cams 48 on the upper seat member 21. The cable cam member 25 is received in the upper seat member 21, with the cams 48 accommodated in the cam profiles 73, and the cam surfaces 49 engaging the corresponding cam surfaces 74 of the cam profiles 73. The outer axial face 75 of the cable cam member 25 engages the inner axial face 68 of the second lock member 24. The button 15 is connected to the cable 26, and when the button 15 is activated the cable 26 rotates the cable cam member 25, and the engagement of the cam surfaces 49, 74 moves the cable cam member 25 axially away from the upper seat member 21. This moves the second lock member 24 out of engagement with the upper seat member 21 to allow relative rotation of the upper seat member 21 and the adapter member 30.

The cover member 27 mounts the restraining bar 7, and the pins 77 which complete the limiting mechanism 52. There are two diametrally-opposed pins 77 attached to the cover member 27, and extending axially, one through each of the circumferential apertures 57 in the lower seat member 22, and into the corresponding groove 51 in the upper seat member 21. At the position of minimum overlap of the respective apertures 57 and grooves 51, each pin 77 is locked in position. As the overlap increases, each pin 77 is free to move, and eventually comes into engagement with the end of the respective groove 51, and is carried towards the other end of the respective aperture 57, when the respective grooves 51 and apertures 57 are in registry. In the reverse operation each pin 77 is carried by its groove 51 to the other end of the aperture 57, and locked in position, between the ends of the respective groove and aperture, at the position of minimum overlap.

In the position shown in Figure 1, the seat 3 is in the upright position. The first lock member 23 is in engagement with both the upper seat member 21 and the lower seat member 22 to lock the upper and lower seats 12, 13 together in the open position. The cam surfaces 40 (on the adapter member 30) and 62 (on the first lock member 23) are partly engaged. The grooves 51 and apertures 57 on the upper and lower seat members 21, 22 are in the position of minimum overlap, with the pins 77 locked between them. This ensures that the restraining bar 7 is locked in the open position shown. The seat 3 as a whole is locked in the upright orientation by the engagement of the second lock member 22 in adapter member 30 and the upper seat member 21. The cable cam member 25 is received in the upper seat member 21, but the cam surfaces 49 and 74 are out of engagement. The axial faces of the cable cam member 25 and second lock member 24 are in engagement.

To change the orientation of the seat 3 the button 15 is pushed, to pull the cable 26 and rotate the cable cam member 25. This causes the cam surfaces 49 and 74 to engage, and move the cable cam member 25 axially towards the second lock member 24. This movement urges the second lock member 24 axially against the force in the spring, and out of engagement with the upper seat member 21, allowing the upper seat member 21 to rotate relative to the adapter member 30. The seat 3 is still in the open position, as the first lock member 23 is unaffected by this movement, and continues to lock the upper and lower seat members 21, 22 together. The seat 3 can adopt three orientations, the upright orientation shown, and intermediate and recline orientations by rotating the seat 3 anticlockwise as shown in Figure 1. In the recline orientation the cam surfaces 40 and 62 are out of engagement. AS the seat 3 is rotated to the upright orientation the cam surfaces 40 and 62 start to engage, and move the first lock member 23 axially, against the force in the spring, away from the upper seat member 21. In the upright orientation the first lock member 23 is still in engagement with the upper and lower seat members 21, 22.

However, if the seat 3 is moved beyond the upright orientation (that is, clockwise in Figure 1) the engagement of the cam surfaces 40 and 62 moves the first lock member 23 axially and out of engagement with the upper seat member 21. The first lock member 23 is then fully received in the lower seat member 22. This unlocks the upper and lower seats 12, 13, so that the upper seat 12 can rotate relative to the lower seat 13 into the folded position. As the upper seat member 21 rotates relative to the lower seat member 22, the grooves 51 and apertures 57 start to overlap more, releasing the pins 77, and enabling the cover member 27 also to rotate. Further movement of the upper seat member 21 engages the pins 77, urging them to the ends of the apertures 57. As a result, the cover member 27 rotates and the restraining bar 7 is automatically moved into a folded position between the upper and lower seats 12, 13. It will be appreciated that this arrangement enables the upper seat to rotate nearly 180° to be adjacent the lower seat 13 in the folded position. In this position the first lock member 23 remains out of engagement with the upper seat member 21, but on release of the button 15 the second lock member 24 moves axially to lock the upper seat member 21 to the adapter member 30. Once the seat 3 is folded the pushchair frame 2 can be folded too. The seat 3 may be removed for use elsewhere. For unfolding the seat 3, the button 15 is again pushed, to release the second locking member 24. This enables the upper seat member 21 to rotate relative to the adapter member 30 and the lower seat member 22, as the first lock member 23 is not in engagement with the upper seat member 21. The rotation of the upper seat member 21 relative to the lower seat member 22 also moves the cover 27, by engagement of the ends of the grooves 51 with the pins 77, and thus pulls the restraining bar 7 automatically into the open position. When the upper seat member 21 reaches the open position, the cam surfaces 40, 62 allow the spring to urge the first lock member 23 into engagement with the upper seat member 21 again, locking the upper and lower seat members together so that the seat 3 is secured in the open position, with the restraining bar 7 secured by the pins 77 between the ends of the grooves 51 and apertures 57.

The arrangement as described provides a compact and robust construction, which is very simple to operate one-handed, while providing a compact folded position and a secure open position of the seat 3.

Claims

A collapsible child seat (3) comprises an upper seat (12) , a lower seat (13) , and at least one mounting assembly (11) adapted for mounting on a frame (2) of a child transport device (1) , the upper and lower seats being movable between folded and open positions of the seat by actuation of a manually-operable member (15) , and in the open position being movable into at least two orientations relative to the or each mounting assembly, the or each mounting assembly (11) comprising an adapter member (20) adapted for engagement with the frame (2) , an upper seat member (21) on which the upper seat (12) is mounted, a lower seat member (22) on which the lower seat (13) is mounted, a first lock member (23) acting to lock the upper seat member to the lower seat member in the open position of the seat, and a second lock member (24) acting to lock one of the seat members to the adapter member in the at least two orientations, the seat in the open position also being movable into an unlock orientation, the second lock member (24) being released by actuation of the manually-operable member (15) and the first lock member (23) being released by engagement with the adapter member (20) when the seat is in the unlock orientation.
A collapsible child seat as claimed in claim 1, in which the components of the or each mounting assembly (11) are mounted on a common axis.
A collapsible child seat as claimed in claim 1 or claim 2, in which relative rotation of the upper and lower seat members (21, 22) is limited, in order to define the open position of the seat.
A collapsible child seat as claimed in claim 3, in which the limiting means are provided by at least one axially-extending pin (77) , each pin being accommodated in a pair of overlapping circumferential apertures or grooves (51, 57) in the upper and lower seat members.
A collapsible child seat as claimed in claim 4, in which two pins (77) are provided, each being accommodated in a respective pair of overlapping circumferential apertures or grooves.
A collapsible child seat as claimed in claim 4 or claim 4, in which the pin or pins are mounted on a cover component (27) which is also rotatable about the common axis.
A collapsible child seat as claimed in claim 6, in which the cover component (27) mounts a restraining bar (7) .
A collapsible child seat as claimed in any preceding claim, in which the first lock member (23) has a toothed engagement with the upper and lower seat members, and is movable axially into and out of lock and release positions.
A collapsible child seat as claimed in claim 8, in which the first lock member (23) is annular, with external teeth (60) engaging with internal teeth (50, 56) in the upper and lower seat members.
A collapsible child seat as claimed in any preceding claim, in which the first lock member (23) has at least one internal cam surface (62) for engagement with a corresponding external cam surface (40) on an axial projection (36) of the adapter member.
A collapsible child seat as claimed in any preceding claim, in which a spring is provided to urge the first lock member (23) into engagement with the upper seat member (21) as the seat is unfolded into the open position.
A collapsible child seat as claimed in any preceding claim, in which the second lock member (24) has a toothed engagement with the upper seat member (21) and the adapter member (20) , and is movable axially into and out of lock and release positions.
A collapsible child seat as claimed in claim 12, in which the second lock member (24) is annular, with external teeth (65) engaging with internal teeth (47, 41) in the upper seat member (21) and the adapter member (20) .
A collapsible child seat as claimed in any preceding claim, in which a cable cam member (25) is accommodated between the upper seat member (21) and the second lock member (24) , the cable cam member having an internal cam surface (73) for engagement with a corresponding external cam surface (48) on the upper seat member (21) and rotation of the cable cam member (25) by the manually-operable member (15) moving the second lock member (24) axially out of engagement with the upper seat member (21) .
A collapsible child seat as claimed in claim 14, in which a spring is provided to urge the second lock member (24) back into engagement with the upper seat member (21) when the manually-operable member (15) is released.
A collapsible child seat as claimed in claim 14 or claim 15, in which the manually-operable member (15) comprises a button acting to pull a cable (26) attached to the cable cam member in order to rotate it.
A collapsible child seat (3) comprises an upper seat (12) , a lower seat (13) , a restraining bar (7) and at least one mounting assembly (11) adapted for mounting on a frame (2) of a child transport device (1) , the upper and lower seats being movable between folded and open positions of the seat by actuation of a manually-operable member (15) , the or each mounting assembly (11) comprising an adapter member (20) adapted for engagement with the frame, an upper seat member (21) on which the upper seat (12) is mounted, a lower seat member (22) on which the lower seat (13) is mounted and a restraining bar member (27) on which the restraining bar (7) is mounted, the restraining bar member having at least one pin (77) accommodated in overlapping circumferentially extending apertures or grooves (51, 57) in the upper and lower seat members (21, 22) which are relatively rotatable, the arrangement being such that in the open position of the seat the overlap between the apertures or grooves of the upper and lower seat members is at a minimum and the pin is held between the ends of the apertures or grooves, and in movement of the seat between the open and folded positions the pin moves in the apertures or grooves.
A collapsible child seat as claimed in claim 17, in which the restraining bar member (27) has a pair of pins (77) , each pin working in a corresponding pair of overlapping apertures or grooves in the upper and lower seat members.
A collapsible child seat as claimed in claim 17 or claim 18, in which in the open position of the seat the upper and lower seat members are locked by a lock member (23) .
A collapsible child seat as claimed in any of claims 17 to 19, in which each of the upper and lower seat members (21, 22) has apertures in which the pins are accommodated, or one may have apertures, and the other corresponding grooves.
A collapsible child seat as claimed in any of claims 17 to 20, in which the restraining bar member (27) acts as a cover member for the mounting assembly.
A collapsible child seat as claimed in any of claims 17 to 21, in which the restraining bar member (27) is rotatable relative to the adapter member (20) .