FR3035833A1 - CHILD CAR SEAT HAVING ADJUSTABLE STRAP GUIDING ELEMENTS - Google Patents

Abstract

The invention relates to a car seat for a child comprising a seat (3) carrying guide elements (4) of a lap strap of a seat belt of a vehicle, intended to hold said child in said seat. According to the invention, such guide elements are movable in a first direction, said X direction, corresponding substantially to the main axis of the vehicle, and in a second direction, said Y direction, perpendicular to the X direction, the X directions and Y being substantially included in the plane of the seat.

Description

1 Child car seat with adjustable webbing guide elements. FIELD OF THE DISCLOSURE The field of the invention is that of childcare. More specifically, the invention relates to child car seats that are intended to be installed on the passenger seats of vehicles. It relates, in particular, car seats adapted to receive children of varying sizes and / or weight, and likely to evolve to take into account the growth of a child over several years.

The invention applies in particular to adjustable car seats, and more particularly to car seats for children over 15kg, in which the three-point safety belt of the vehicle is used to attach the child. The invention particularly relates to the optimization of the implementation of this three-point belt. 2. Prior art and its disadvantages Vehicle seat belts are designed by car manufacturers to effectively retain adult passengers in the event of an impact. In order to properly secure a child in a vehicle using such a seat belt, it should be installed on a car seat for children, which allows to adapt the morphology of the child to that of the child. vehicle seat. In particular, the child car seats can enhance the seat of the vehicle seat to position the child properly relative to the seat belt, and in particular to ensure the precise passage of the diagonal belt of the seat belt to the seat belt. level of the child's shoulder.

Such car seats also have guide elements of the lap belt of the safety belt, otherwise known as webbing guides. In case of shock of the vehicle, the mechanical forces transmitted to the seat belt are then mainly redistributed to the structure of the car seat via the webbing guides. The mechanical forces transmitted to the body of the child, especially in the abdomen, are then reduced, thus minimizing the risk of damage to the physical integrity of the child during a crash of the vehicle.

3035833 2 Such car seats are generally used from around the age of four, and their use is recommended until they are about ten years old. However, from four to ten years, the morphology of the children evolves strongly, as well in terms of size as of corpulence. In order to adapt to this development, the patent document EP 0 608 5 597 presents a car seat in which the spacing of the strap guides is adjustable in the direction of the seat width, otherwise called the Y direction. The guides strap of such a car seat can indeed slide relative to each other in the Y direction, so as to adapt the car seat to change the pelvis width of the child over time.

If this solution makes it possible to ensure a better comfort for the child, while ensuring the widening of the seat as it grows, it does not, however, make it possible to meet all the safety requirements that must be fulfilled. the abdominal strap guides. Indeed, it is important that the strap guides are always perfectly positioned relative to the child, so that they can correctly assume their role of supporting the lap belt of the safety belt, and thus maintain their effectiveness in terms of redistribution of mechanical forces during an impact. However, during its growth, the child evolves in size, but also in width of pelvis and corpulence, or waist.

There is therefore a need for a child car seat that makes it possible to adapt to the child's entire morphological evolution, and thus maintain the effectiveness of the strap guides in terms of the redistribution of the mechanical stresses. in case of shock at any stage of its growth. There is also a need for such a car seat that ensures optimal comfort for the child, regardless of age and morphology. 3. DISCLOSURE OF THE INVENTION The invention meets these needs by providing a child car seat comprising a seat carrying guiding elements of a lap strap of a seat belt of a vehicle, intended to maintain the child in the seat.

According to the invention, such guide elements are movable in a first direction, called X direction, substantially corresponding to the main axis of the vehicle, and 3035833 3 in a second direction, said Y direction, perpendicular to the X direction, the X and Y directions being substantially included in the plane of the seat. Thus, the invention is based on a completely new and inventive approach to adjustable child car seats. Indeed, the invention proposes a car seat in which the guiding elements of the lap strap of a safety belt are movable in at least two directions relative to the plane of the seat, the plane of the seat being defined as a plane substantially tangent to the upper surface of the seat for supporting the child (which could also be described as substantially horizontal plane).

The position of the guide elements can therefore be modified both in the direction of the seat width (Y direction) and in the direction of the seat depth (X direction), so that the guide elements can continue to ensure their role of supporting a seat belt lap belt as the child grows. Such guide elements therefore allow the car seat to adapt to changes in the child's morphology, not only in terms of hip width or pelvis, but also in terms of body size or waist. Note that "main axis of the vehicle" means the axis extending from the rear part of the vehicle (trunk and passenger side) to the front of the vehicle (motor and driver side), and vice versa.

According to one embodiment, the guide elements are also movable in a third direction, said direction Z, substantially vertical. Thus, the position of the guide elements can then also be modified in the direction of the height (Z direction), which makes it possible to adapt more finely the positioning of the guide elements with respect to the morphology of the child. In effect, it will be noted that the thigh circumference of the child generally increases with the width of the pelvis and the waist, so that a height adjustment (Z) of the straps guides advantageously completes a setting in width (Y) and depth (X). The guide elements are then movable in three directions of space which are substantially orthogonal.

According to another embodiment, the guide elements are able to slide in guide holes formed in the seat.

3035833 4 Guide lights provide a simple, robust and economical way to guide X, Y and Z directions of moving guide elements. According to yet another embodiment, the guide lights comprise at least two non-aligned sections, a section extending along one of said directions or a combination of said directions. Thus, the various orientations of the sections of the guide lights allow the guide elements to more accurately follow the development of the child as and when sliding in the guide lights. Indeed, it has been found that the curve of the morphological evolution of the child between four and ten years is not linear, so that at certain stages of growth the waistline grows faster than the pelvis width, while at other stages the waistline stabilizes for continuous growth of the pelvis or hip width. The design of the guide lumens as successive lengths of distinct lengths and directions allows for an optimized movement of the strap guides depending on these different stages or growth stages of the children. According to another particular embodiment, the guide lights comprise a first section extending along the direction X, and a second section extending along a combination of the X and Y directions, the second section being oriented so that the mutual spacing of the guide members in the Y direction increases as the guide members slide in said second section away from the rear portion of the seat. Such orientations of the sections of the guide lights allow the guide elements to follow the usual steps of growth of a child. The first section in the direction X is preferably placed on the side of the rear part of the seat, that is to say on the side of the seat located near the seat back of the vehicle, or the seat back. car seat if it includes one. The second section is farther than the first section of the rear portion of the seat. According to another embodiment, the guide lights comprise a third section extending along the direction X.

The presence of a third section extending along the X direction makes it possible to prolong the use of the car seat during the growth of the child.

According to another embodiment, the car seat comprises means for adjusting the position of the guide elements acting together on all the guide elements. Such adjustment means facilitate the use of the car seat by allowing the user to adjust the position of all the guide elements in one and the same movement, thus reducing the number of manipulations required for the proper installation of the seat. self. According to another embodiment, such a car seat comprises means for adjusting the height of the seat (Z direction), related to the means for adjusting the position of the guide elements, so that an actuation of the means adjustment of height causes the actuation of the means for adjusting the position of the guide elements, or vice versa. An adjustment in height of the seat, according to the Z direction, allows to better position the torso of the child relative to the diagonal strap of the seat belt.

It is advantageous to combine the height adjustment of the seat with the adjustment of the position of the lap belt guides, on the assumption that the growth of the child's torso is most often accompanied by a growth of his or her body. width of the pelvis and / or its corpulence. Thus, the number of manipulations that parents must operate to best install their child is optimized and restricted. When the parents lower the seat of the seat (the growing child), the strap guides jointly deviate in X and Y. According to another embodiment, the car seat comprises a backrest with a headrest whose position is adjustable, and a displacement of the headrest causes the actuation of the means for adjusting the position of the guide elements, or vice versa. The presence of a backrest equipped with a headrest makes it possible to improve the comfort of the child and to give him an increased protection in the event of lateral shocks. In addition, such a headrest most often has a guiding element of the diagonal strap of the seat belt of the vehicle. By moving the headrest along the backrest, to place it at the right height relative to the position of the head of the child, the strap guide is moved simultaneously, which brings the diagonal strap precisely to the level of the head. shoulder of the child. It is therefore particularly advantageous to provide a simultaneous adjustment of the position of the headrest, and therefore the guide elements of the diagonal strap, and the position of the guiding elements of the abdominal strap. In fact, growth in child size is most often combined with growth in body size and pelvis width. Such a joint adjustment makes it even easier to use the car seat, the position of the guiding elements of the diagonal and abdominal straps 10 can be adjusted in the same movement, thus reducing the number of manipulations required to the correct installation of the child in the car seat. According to another embodiment, such a car seat comprises depth adjustment means of the seat (direction X), related to the means for adjusting the position of the guide elements, and the actuation of the adjustment means. the depth of the seat causes actuation means for adjusting the position of the guide elements, or vice versa. Some seats are indeed adjustable in depth, according to the X direction, so as to position the best knee of the child compared to the front edge of the seat, and improve the comfort of the child by avoiding unpleasant feelings of ankylosis or tingling. It is therefore advantageous to combine the depth adjustment of the seat with the adjustment of the position of the lap strap guides, on the assumption that the growth of the length of the thigh of the child is most often accompanied by a growth of its pelvis width and / or its corpulence. Thus, the number of manipulations that parents must operate to best install their child is optimized and restricted. According to another embodiment, the adjustment means comprise a worm cooperating with a connecting rod. Such adjustment means are simple, robust and economical. It is then sufficient for the user to screw or unscrew a button provided for this purpose on the front part of the seat to see the guides straps move away while advancing, or get closer while moving 3035833 7 (or to make any other movement imposed for example by the shape of the guide lights). In a variant, such adjustment means may also implement a flat bar mechanism, such as a Peauellier-Lipkin or Chebyshev device, allowing the conversion of a circular motion to a rectilinear or pseudo-movement. straight. Any other type of adjustment means for adjusting the position of the guide elements of the lap strap can of course also be implemented without departing from the scope of the present invention. 4. List of Figures Other features and advantages of the invention will appear more clearly on reading the following description, given as a simple illustrative and nonlimiting example, and the accompanying drawings, in which: FIGS. 1B show a schematic side view of a child car seat according to the invention; Figures 2A and 2B show a schematic view of the top of the car seat of Figures 1A and 1B; Figs. 3A and 3B each show an example of a guide light shape; FIGS. 4A and 4B show an embodiment of the adjustment means in the initial position (FIG. 4A) and in the adjusted position (FIG. 4B); Figures 5A and 5B show an embodiment of the seat height adjustment means in the lower position (Figure 5A) and in the upper position (Figure 5B); Figs. 6A and 6B show another embodiment of the seat height adjustment means in the down position (Fig. 6A) and in the up position (Fig. 6B); Figure 7 shows a block diagram of a child car seat in which the movement of the headrest induces a movement of the strap guides; FIGS. 8A and 8B illustrate a profile view (FIG. 8A) and a view from above (FIG. 8B) of a return mechanism linking the displacement of the headrest to the displacement of the strap guides; Figures 9A and 9B illustrate a sectional view of a webbing guide 5 provided with a guide pin cooperating with a guiding light (Figure 9A) and with an articulated mechanism (Figure 9B). 5. DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION The general principle of the invention is based on the adjustment, in several directions, of the position of the guiding elements of the lap strap of a seat belt in a seat. child car. In the following, we will describe a particular embodiment of the invention wherein the car seat comprises a seat, and a folder, possibly removable. The presence of such a folder is of course optional, and the invention also covers car seats comprising a seat but without a folder.

Figures 1A and 1B illustrate a schematic side view of a child car seat according to a first embodiment. As illustrated in FIG. 1A, such a car seat 1 comprises a backrest 2, a seat 3 and webbing guides 4. The strap guides 4 have a bearing surface 5 serving to accommodate the passage of a lap strap a seat belt of a vehicle.

When the strap guides 4 are correctly positioned relative to the child, the lap strap of the safety belt bears on the support surfaces 5 of the strap guides 4 rather than on the child's abdomen. . In the event of a shock, the mechanical forces imposed on the seat belt webbing are then mainly redistributed to the car seat structure via the webbing guides 4 rather than to the child's abdomen. The physical integrity of the child is thus preserved. The growth of the child requires a change of position of the strap guides 4 so that the seat belt strap continues to bear on the support surfaces 5 of the strap guides 4 rather than on the abdomen of the child . Thus, FIG. 1B shows a schematic side view of the webbing guides 4 after a displacement, represented by the arrow A, from an initial position close to the rear 3035833 9 of the seat, as represented in FIG. 1A, towards a position closer to the front of the seat, as illustrated in FIG. 1B. FIG. 2A shows a schematic view of the top of the car seat of FIG. 1A in which the strap guides 4 are in the initial position, close to the rear of the seat. FIG. 2B shows a schematic view of the top of the strap guides 4 after their displacement, each represented by one of the arrows B1 and B2, from an initial position close to the rear of the seat, as represented in FIG. 2A, to a position closer to the front of the seat in which the webbing guides 4 are further apart than in the initial position. Indeed, the webbing guides 4 move diagonally in the plane of the seat along the arrows B1 and B2, whose directions are each a combination of the first direction, said X direction, and a second direction, so-called direction Y, this second direction corresponding to the direction of the seat width of the car seat.

Thus, when the child is growing up, the guide strips 4 are moved: on the one hand, away from each other, to accompany the growth of the width of the child's pelvis; on the other hand by moving them from the back to the front part of the seat, to accompany the growth of his waist.

According to another embodiment (not shown), the strap guides can also move in a third direction, said Z direction, this third direction corresponding substantially to the direction of the height of the car seat. The position of the strap guides is then variable along three substantially orthogonal space dimensions, allowing the position of the strap guides to be more finely adapted to the morphology of the child. The strap guides then rise in a vertical direction, in a movement combined with that illustrated by the arrows B1 and B2 of Figure 2B, to also take into account the growth of the thigh of the child. According to a particular embodiment, the strap guides slide in guide lights, which are composed of one or more sections. Each section is oriented along one of the X, Y or Z directions or a combination of these directions.

By way of example, and as illustrated in FIG. 3A, the guide slots 11 may comprise a first rectilinear section 12 which extends along the direction X from the rear of the seat 3, and a second rectilinear section 13, contiguous to the first section 12 and extending along a combination of the X and Y directions. This second section 13 is generally oriented so that, during the sliding of the strap guides 4 in the second section 13, the mutual spacing of the webbing guides 4 increases along the direction Y, in the direction of the seat width. Thus, during the growth of the child, the strap guides slide first along the first section 12 extending in the direction of the seat depth. The strap guides 4 then move away from the back of the seat to accompany the first stages of growth of the child. When the basin of the latter begins to grow in width significantly, the webbing guides 4 take the second section 13 which allows the mutual spacing of the webbing guides 4 in the direction of the seat width, together with their displacement from the back to the front of the seat.

It will also be possible to provide a third rectilinear section 14, as illustrated in FIG. 3B, extending along the direction X in order to accompany the child in his subsequent growth stages. In addition, the guide lights 11 may have a bottom inclined relative to the plane of the seat, so that when the strap guides 4 slide in these slots 11, they can also be raised or lowered by compared to the seating plan. In particular, the portion of the guiding light 11 situated towards the rear of the seat (for example the first section referenced 12) has a bottom that is lower relative to the plane of the seat than that of the part of the light of the seat. guidance located towards the front of the seat (for example the second section referenced 13); thus, when the webbing guides 4 slide towards the front of the seat, they rise with respect to the plane of the seat, and thus have a combined movement in the X, Y and Z directions. The different movements of the guide belts FIGS. 1A to 2B may be made possible by the presence of adjustment means which make it possible to adjust together the position of the set of strap guides, so that the user can only a single manipulation to perform to adapt the position of the webbing guides to the morphology of the child.

FIGS. 4A and 4B show an embodiment of such adjustment means, represented in an initial position in FIG. 4A as well as in a position adjusted in FIG. 4B, in which the user has actuated the adjustment means so as to move the strap guides 4 along the guide lumen 11 from the initial position. As illustrated in FIG. 4A, such adjustment means comprise, for example, a worm 6 and a connecting rod 7 of variable effective length, the ends of which are referenced 8 and 9. The rod 7 is connected by a helical connection to the worm 6 at its first end 8, while the second end 9 10 of the rod 7 is connected to a guide pin 10 which slides in the guide slot 11. The guide pin 10 is integral with the guides 4, so that the sliding of the guide pin 10 in the guide slot 11 drives the webbing guides 4 in translation along the guide light 11. According to this embodiment, the guide pin 10 is secured. (For example 15 by embedding) at the second end 9 of the rod 7, and the rod 7 is telescopic so that it can vary in length (which is necessary in the case of Figure 4A, where the axis of a guide light 11 and the axis of the worm 6 are not parallel). Thus, when the user of the car seat actuates a wheel, arranged on the front part of the seat, and acting on the worm 6, the rod 7 slides along the worm 6 at its first 8 end, driving with it the guide pin 10 at its second end 9. Note that in Figure 4B, the length of the rod 7 is greater than in Figure 4A because the guide light 11 imposes the 10 The variability of the effective length of the connecting rod 7 25 thus allows the adjustment means to accommodate the various possible directions of the guide light 11 in the plane of the seat. In a variant, the connecting rod 7 is no longer telescopic and the connection between the second end 9 of the connecting rod 7 and the guide pin 10 is a sliding connection, the slide extending along the rod 7. The effective length of the rod the rod 7 is thus also adjustable.

As a variant, it is of course also possible to provide separate adjustment means for each of the strap guides. According to a particular embodiment, the seat 3 is adjustable in height by means of a vis-compass system illustrated in FIGS. 5A and 5B. A screw 51, operable in rotation by a crank 52, extends below the seat 3 in one of the directions X, Y or a combination of these directions X and Y (in the embodiment of FIGS. 5A and 5B, the screw 51 extends substantially in the direction Y). The screw 51 cooperates with a compass 53, whose ends 531, 532 of its branches are each provided with a screw thread cooperating with the screw 51 so as to slide along the latter during the actuation of the crank 52. The two branches of the compass 53 are interconnected at one of their ends by a pivot connection 533, which is also secured to a lower portion of the seat 3 by a screw-nut system (not illustrated), or any other suitable means such as a weld. According to the direction of rotation of the crank 52, the ends 531, 532 of the compass 53 will either move closer, displacing the pivot connection 533 and the seat 3 upwards, or they will move apart, in which case the connection pivot 533 and seat 3 go down. In addition, the adjustment of the seat height causes the actuation of the means for adjusting the position of the strap guides 4. The rotation of the screw 51 during the adjustment of the seat height also actuates the screw Endless 6 via a mechanism (not shown) employing a gear system. According to another particular embodiment, the seat 3 is height-adjustable by means of a plane-contact linkage mechanism illustrated in FIGS. 6A and 6B, in which the seat 3 is composed of two upper 32 and lower 31 complementary parts, for example in the form of a trapezoid-based right prism, and whose lower part 31 is connected to a cable 81. The lower 31 and upper 32 parts cooperate via a plane support connection, the plane being inclined relative to a defined horizontal plane by the X and Y directions. The direction of inclination of the inclined plane of the plane bearing connection of FIGS. 6A and 6B is such that, during a tension exerted on the cable 81, the lower part 31 is guided in translation in the direction of the tensile force, which causes, by sliding along the plane support connection, the translational guidance of the upper part 32 in the Z direction. The conveyor 81 causes a height displacement of the seat 3. The return to a low position of the seat 3 can be effected by means of a spring system (not shown).

In addition, such an adjustment of the height of the seat can be advantageously coupled to an adjustment of the position of the strap guides, as described in more detail hereinafter with reference to FIGS. 8A and 8B. According to a particular embodiment, the seat of the car seat is of adjustable depth, an adjustment of the seat depth actuating the means for adjusting the position of the strap guides. It is then sufficient to adjust the depth of the seat to the size of the child so that the adjusting means act concomitantly on the position of the webbing guides. This minimizes the number of manipulations to be made to adapt the car seat to the morphology of the child. It will be possible to provide a return mechanism (not shown) comprising a rack which, following the translational movement of the seat during the adjustment of its length, rotates a toothed wheel which in turn enables the drive to be driven. rotating the worm 6 adjusting means (Figures 4A, 4B) via a gear system. The backrest 2 also has a headrest whose position is adjustable, in height, so that it is positioned at best with respect to the head of the child. In a particular embodiment, the height displacement of the headrest actuates the means for adjusting the position of the strap guides. It is then sufficient to adjust the position of the headrest to the size of the child so that the adjustment means act concomitantly on the position of the strap guides.

FIG. 7 illustrates such a principle, according to which a movement of the headrest 61 in the direction Z induces a movement of the strap guides 4 in at least one of the directions X, Y and Z. This makes it possible to minimize the number of manipulations to perform to adapt the car seat to the morphology of the child. To do this, it may for example provide a return mechanism 30 for actuating the adjustment means during the movement of the headrest. Such a return mechanism, illustrated in Figures 8A-8B and 9A-9B, comprises a cable 71 connecting the headrest 72 to an articulated mechanism 73 located in the seat 3. A first portion 711 of the cable 71 extends along the back 2, substantially along the Z direction, from the headrest 72 to a pulley 74 cooperating with the cable 71. The pulley 74 is used to guide a second portion 712 of the cable 71 along the seat 35 in the X direction to a pivot link 731 of the articulated mechanism 73. This pivot connection 731 connects the first ends of two arms 732 situated substantially in the plane of the seat, which extend in a combination of the directions X and Y. Each of these arms 732 comprises, in the vicinity of its second end, at least one slot 733, intended to cooperate with a guide pin 10 of the strap guides 4 so as to form a sliding pivot connection 76. such connection 76 allows on the one hand the pivoting of each arm 732 around the guide pin 10 and, on the other hand, the sliding of the arm 732 along the guide pin 10. Each guide pin 10 also cooperates with the guide holes 11 formed in the seat 3, which are oriented in the plane of the seat in one of the X or Y directions, or a combination of the X and Y directions. By moving the headrest 72 upwards in the Z direction, the user exerts substantially vertical traction force at the first portion 711 of the cable 71. With the pulley 74, the substantially vertical force at the first portion 711 is reflected at the second portion 712 of the cable 71 in a force of 20 substantially horizontal traction in the direction X. This traction force is exerted on the pivot link 731 so as to set the articulated mechanism 73 in motion in the plane of the seat 3 in the direction X. The sliding pivot connection 76 between the lum 733 and the guide pin 10 then allows on the one hand to accommodate the change of orientation of the arms 732 in the plane of the seat and the change in distance 25 between the pivot link 731 and the guide pin 10 during the displacement of the articulated mechanism 73. On the other hand, the link 76 makes it possible to transmit to the guide pin 10 at least a portion of the tensile force imparted by the cable 71 at the pivot connection 731. The strap guides 4, integral with their guide pin 10, are then moved along the guide holes 11 thanks to the pulling force of the cable 71 generated by the user during the displacement of the headrest 72.

In a variant, the arms 732 may comprise one or more joints, for example pivot links, between the link 731 and the link 76. In a variant, the arms of the articulated mechanism may be telescopic in nature and have no lights. The link between the arms and the guide posts then consists of a simple pivot connection making it possible on the one hand to accommodate the change of orientation of the arms in the plane of the seat and, on the other hand, to transmit the tensile force of the cable at the guide pins. The telescopic nature of the arms also makes it possible to accommodate the change in distance between the guide posts and the articulated mechanism.

According to another embodiment, the seat height adjustment means illustrated in Figs. 6A and 6B may be combined with the return mechanism of Figs. 8A and 8B. Indeed, the second portion 712 of the cable 71 of Figures 8A, 8B may coincide with the pull cable 81 of Figures 6A, 6B. Thus, during an upward movement of the headrest 72, a traction made on the cable 71 makes it possible to act together on the articulated mechanism 73 (FIG. 8B), causing the straps guides to move, and on the lower part 31 of the seat 3 (Figures 6A, 6B), causing a height adjustment of the seat. Other alternative embodiments may of course be envisaged, which allow, when the headrest is moved upwards, to move the strap guides away from one another in X and Y, or even to cause their displacement upward Z. According to alternative embodiments, the adjustment means may implement a flat bar mechanism and / or a rack mechanism and / or magnetic means. 25

Claims (11)

REVENDICATIONS1. Child car seat comprising a seat (3) carrying guide elements (4) of a lap strap of a seat belt of a vehicle, intended to hold said child in said seat, characterized in that said seat elements guide (4) are movable in a first direction, said direction X, substantially corresponding to the main axis of said vehicle, and in a second direction, said direction Y, perpendicular to said direction X, said directions X and Y being substantially included in the plane of said seat (3). 2. child car seat according to claim 1, characterized in that said guide elements (4) are movable in a third direction, said Z direction, said third direction being substantially vertical. 3. child car seat according to any one of claims 1 and 2, characterized in that said guide elements (4) are slidable in guide slots (11) formed in said seat (3). 4. child car seat according to claim 3, characterized in that said guide lights (11) comprise at least two non-aligned sections (12, 13, 14), a section extending along one of said directions or a combination of said directions. Child's car seat according to any one of claims 3 and 4, characterized in that said guide slots (11) comprise a first section (12) extending along said direction X, and a second section ( 13) extending along a combination of said X and Y directions, and in that said second section (13) is oriented such that mutual spacing of said guide members (4) in said Y direction increases as said guiding elements (4) slide in said second section (13) away from a rear part of the seat (3). A child car seat according to claim 5, characterized in that said guide slots (11) comprise a third section (14) extending along said X direction. 7. child car seat according to any one of claims 1 to 6, characterized in that it comprises means (6, 7) for adjusting the position of said guide elements (4) acting jointly on the together said guide elements (4). 8. car seat child according to claim 7, characterized in that it comprises means for adjusting the height of said seat (3), connected to said adjusting means (6, 7) of the position of said guide elements. (4), so that actuation of said height adjustment means causes said adjustment means (6, 7) to actuate the position of said guide members (4), or vice versa. 10 9. child car seat according to one of claims 7 and 8, characterized in that it comprises a backrest (2) carrying a headrest (72) whose position is adjustable, and in that a displacement of said headrest (72) causes said adjustment means (6, 7) to actuate the position of said guide members (4), or vice versa. 15 10. Child car seat according to any one of claims 7 to 9, characterized in that it comprises means for adjusting the length of said seat (3), connected to said position adjusting means of said guide elements. such that actuation of said seat length adjustment means causes said adjustment means (6, 7) to actuate the position of said guide members (4), or vice versa. 11. child car seat according to any one of claims 7 to 10, characterized in that said adjusting means (6, 7) comprise a worm (6) cooperating with a connecting rod (7).