DE102006033849B4 - Fastening system for a motor vehicle child seat - Google Patents

Abstract

Fastening system for a motor vehicle child seat (100), in which a seat belt (10) is used to fasten the child seat (100) to a vehicle seat, the child seat (100) having a substantially vertical back region (110) and a substantially has horizontally extending floor area (120) and is designed to be arranged with the floor area (120) on the seat surface of the vehicle seat and to be held there with the seat belt (10); - the seat belt (10) via a first, second and third point ( B, C) is connectable to a support structure of the vehicle and has a first belt section (lap belt; 13) extending between the first and second point (B) and a second belt section (shoulder belt) extending between the second and third point (B, C) ; 15) has; and- the fastening system has first guide means (2) which are provided on a front section (121) of the floor area (120) of the child seat (100) pointing in the direction of travel and define a first belt guide area (3) over which the first belt section ( 13) of the seat belt (10), characterized in that the fastening system also has second guide means (4) which are provided on a section (111) of the back area (110) of the child seat (100) pointing in the direction of travel and a diagonal one there Set extending second belt guide area (5) over which the second belt section (15) of the seat belt (10) is at least partially guided.

Description

The present invention relates to a fastening system for a motor vehicle child seat, in which a seat belt is used to fasten a child seat to a vehicle seat, the child seat having a substantially vertically extending back region and a substantially horizontally extending floor region and being designed with the floor region arranged on the seat surface of the vehicle seat and held there with the seat belt, the seat belt being connectable to a support structure of the vehicle via a first, second and third point and a first belt section extending between the first and second point and a belt section between the second and third point extending second belt section, wherein the fastening system has first guide means, which are provided on a front section of the floor area of the child seat pointing in the direction of travel, and a first belt Define the guide area over which the first belt section of the seat belt is guided.

The present invention also relates to the use of a fastening system for fastening a child seat on a vehicle seat and a child seat with a fastening system.

The term “first belt section” used herein is generally to be understood as that section of the seat belt which extends between the first and second articulation points of the seat belt on the load-bearing structure of the vehicle. In normal use of the seat belt, the first belt section corresponds to the section of the seat belt that forms the so-called lap belt.

On the other hand, the term “second belt section” used here is to be understood as meaning that section of the seat belt which extends between the second and third articulation points; In normal use of the seat belt, the second belt section is thus identical to the section of the seat belt which forms the so-called shoulder belt.

A fastening system mentioned at the beginning for fastening a child seat on a vehicle seat with the aid of a vehicle-internal three-point seat belt is generally known in principle. The fastening system is generally used to hold the child seat with the aid of the seat belt connected to the support structure of the vehicle (body) in the event of vehicle delays caused by, for example, accident situations, so that the child seat cannot be thrown through the vehicle.

The three-point belt usually provided in a vehicle, which is preferably used in the present invention as the safety belt of the fastening system, usually starts relatively far below on the so-called B-pillar of the vehicle body, goes over the pelvis section to the buckle on the center tunnel of the vehicle and from there over the opposite shoulder section up to the B-pillar. This is also where the seat belt retractor is usually located. The retractor mechanism is usually designed in such a way that it automatically and reliably blocks in the event of an accident and thus prevents the seat belt from lengthening.

Modern vehicles usually also have a belt tensioner mechanism, which, like an airbag, is part of the so-called passive safety system of a vehicle. The seat belt tensioner mechanism is intended to tighten the seat belt during an accident so that the seat belt occupant can participate more quickly in the overall deceleration of the vehicle. The seat belt is then tightened by up to 15 cm within fractions of a second, which is particularly necessary when the seat belt is prevented from resting tightly on the body of the vehicle occupant, for example as a result of thick clothing.

In order not to let the forces increase too much after the seat belt has been tightened in the forward displacement phase of the occupant, a so-called belt force limiter is often provided. This belt force limiter is used in conjunction with the belt tensioner mechanism to limit the maximum force of the seat belt on the occupant.

When using a vehicle-internal seat belt system to fasten a child seat on the vehicle seat, however, such a passive safety system consisting of the belt tensioner mechanism and optionally the belt force limiter cannot be used optimally, if at all. This is due in particular to the special belt guide that is usually used, in which the lap belt (first belt section) of the seat belt is guided around a front section of the floor area of the child seat pointing in the direction of travel, while at the same time the shoulder belt (second belt section) of the seat belt is at least partially in the Is guided essentially horizontally over a forward-facing section of the backrest of the child seat. This essentially horizontal guide of the second belt section in particular does not correspond to the belt guide direction provided for the seat belt system, so that the forces transmitted to the seat belt from the child seat in an accident situation cannot be optimally diverted into the support structure of the vehicle.

For example, from the EP 1 406 784 B1 a fastening system of the type mentioned is known. With this fastening system, a vehicle-internal three-point seat belt is also used, which can be connected to the supporting structure of the vehicle via three points. Similar examples can be found in DE 295 10 642 U1 , DE 697 17 923 T2 , EP 0 853 018 A1 , DE 694 06 558 T2 . That section of the seat belt that defines the lap belt when a vehicle occupant is buckled up, extends in this known fastening system between the first point, which is arranged on a lower section of the B-pillar of the vehicle, and the second point, which is connected to the center tunnel of the Vehicle engaged buckle of the seat belt is defined. On the other hand, that belt section which usually defines the shoulder belt is guided via a belt guide section from the second point to the third point on the upper section of the B-pillar of the vehicle, which is provided on a section of the back area of the child seat pointing in the direction of travel. In this belt guide area, the seat belt is guided horizontally with the help of receiving parts in the side parts of the backrest of the child seat.

However, this horizontal guidance has certain disadvantages. On the one hand, due to the horizontal guidance provided, it cannot be ensured in principle that the known fastening system can be used with every type of vehicle. Because of the partially horizontal belt guide on the back area of the child seat, it is necessary for the vehicle-internal safety belt to be made relatively long, which is often not guaranteed, especially in older vehicles.

On the other hand, for the horizontal guidance of the seat belt in the belt guide section provided on the back area of the child seat, deflections of the seat belt by almost 90 ° are required on the respective receiving parts in the side parts of the backrest of the child seat. In other words, this means that in the solutions known from the prior art, the seat belt runs in a step-like manner from the second articulation point to the third articulation point, at which the belt is guided either vertically or horizontally. This step-shaped belt run is necessary in order to ensure that the seat shell of the child seat fastened to the vehicle seat with the fastening system can be oriented at different inclines.

The vehicle-internal seat belt system is, however, usually designed in such a way that the shoulder belt runs almost in a straight line from the second to the third articulation point. The provision of a stepped course entails the risk that in accident situations the seat belt will be wedged at the deflection points and thus cannot be tightened with the belt tensioner mechanism, for example. Nor can it be ruled out that the retractor mechanism of the vehicle-internal seat belt system does not respond in time when the shoulder belt is blocked in the belt guide section.

In the prior art, there is therefore a general risk that, in the event of an accident, the vehicle's internal seat belt will not be blocked or tightened after a foreseeable sequence of events, and that in the event of vehicle decelerations caused by accident situations, the child seat will not be held on the vehicle seat after a foreseeable sequence of events becomes. In particular, there is the risk that the child seat moves relative to the vehicle seat, so that additional transverse forces act on the child sitting in the child seat.

On the basis of the problem described above, the present invention is based on the object of providing a fastening system, as it is, for example, from the EP 1 406 784 B1 is known to be further developed in order to ensure on the one hand that vehicle-internal three-point seat belts from older motor vehicle models can also be used to attach the child seat, and on the other hand that in the event of an accident the child seat always optimally participates in the overall deceleration of the vehicle, in particular the advantages of a belt tensioner mechanism can also be used to the full.

Furthermore, the present invention is based on the object of specifying a child seat which is equipped with the further developed fastening system for fastening on a vehicle seat, the seat shell of the child seat being adjustable in different lying or sitting positions when mounted on the vehicle seat.

The object mentioned in the first place, relating to the optimization of the fastening system known from the prior art, is achieved according to the invention in that, in a fastening system of the type mentioned, second guide means are also provided, which are provided on a section of the back area of the child seat pointing in the direction of travel and define a diagonally extending second belt guide area over which the first belt section of the seat belt is at least partially guided.

By providing a diagonally running second belt guide area, in particular the belt length between the second and third articulation point is reduced, so that the fastening system can also be used in motor vehicles that have relatively short safety belts at the factory. On the other hand, the diagonal second belt guide area has the advantage that the course of the seat belt, when it is used to attach the child seat, is adapted as closely as possible to the course of the seat belt when it is used as a shoulder belt for a vehicle occupant. It can thereby be achieved that in the case of the safety belt, in particular, no sharp deflections of the second belt section are required on the second belt guide area. Thus, the standard functionality of, for example, a belt tensioner mechanism or the standard functionality of the retractor mechanism is not influenced.

The term “diagonal” used herein is generally to be understood as meaning a belt direction that has both a vertical and a horizontal directional component.

The further object on which the invention is based is achieved with a child seat which is equipped with the fastening system according to the invention and which is fastened to a vehicle seat with this fastening system, the child seat being a base frame which has the essentially vertical back area and the essentially horizontal floor area has, and has a seat shell system, which has a seat shell and a connecting element preferably provided on the underside of the seat shell system, the connecting element being able to be brought into engagement with a connecting element which is correspondingly complementary thereto and is preferably provided on the base area of the base frame in such a way that between the base frame and a non-positive connection is formed with the seat shell system, and the second belt guide area between the area of the back area facing in the direction of travel and the area opposite to the vehicle rtrrichtung pointing surface of the seat shell system is arranged.

Advantageous further developments relating to the fastening system according to the invention are specified in subclaims 2 to 7 and relating to the child seat in subclaims 10 to 16.

With regard to the fastening system, a preferred further development provides that an angle between 20 ° to 70 °, and preferably between 30 ° to 60 °, and even more preferably approximately 35 °, is included between the belt guide direction in the second belt guide area and the horizontal . In these angular ranges, it has been shown that, on the one hand, the child seat optimally participates in the overall deceleration of the vehicle in extreme situations, while on the other hand the overall length of the seat belt used is relatively short, so that the fastening system can also be used effortlessly in all types of vehicle. Taking into account that the belt guide direction of the shoulder belt is normally around 52 °, i.e. when the seat belt is not used to attach a child seat, it can be seen that the specified angular ranges enable belt guide that corresponds to or is close to the ideal belt guide direction lie on the ideal belt guide direction.

With regard to the positioning of the second guide area, it is preferred that this second guide area is formed with the second guide means on an upper section of the back area. This arrangement of the second guide area on the upper section of the back area has particular advantages with regard to simple and user-friendly assembly of the child seat on the vehicle seat. Of course, other arrangements of the second guide area on the back area of the child seat are also conceivable here.

With regard to a preferred implementation of the second guide means, it is further provided that they have at least one receiving element for receiving the second belt section. For example, appropriately designed receiving slots on the back area of the child seat would be conceivable. It is preferred (but not mandatory) here for these receiving elements to receive the second belt section in such a way that it is slidably supported over the second belt guide area. It can thus be ensured that the seat belt can basically be tightened reliably and, above all, more easily, so that ultimately the child seat is held firmly on the vehicle seat.

On the other hand, it would be conceivable to provide the second guide elements in the form of an eyelet element or an eyelet-like element through which the second belt section is guided. The term “eyelet element” or “eyelet-like element” used herein is to be understood as an annular or elongated passage through which the seat belt runs. The The shape of the passage through which the seat belt runs can also be adapted accordingly to the cross-sectional geometry of the seat belt in order to enable the seat belt to be guided as optimally as possible by the guide means.

Furthermore, it would be conceivable that the second guide means have at least one manually operable locking element in order to lock the second belt section on the second belt guide area and to prevent a relative movement of the second belt section with respect to the second belt guide area. A manually operable clamping element, for example, can be considered as a possible implementation of the locking element.

With regard to the preferred further developments of the child seat according to the invention, it is provided that the seat shell system around a substantially vertical axis of rotation formed with the connecting elements relative to the base frame between a first position in which the seat shell points in the direction of travel and a second position in which the Seat shell shows against the direction of travel, is rotatable or adjustable. Thus, this is a child seat that can be rotated from a position pointing in the direction of travel to a position opposite to the direction of travel and vice versa, with the provision of the fastening system according to the invention optimizing the fastening of the child seat to the vehicle seat.

The second belt guide area is preferably delimited by the outer periphery of the seat shell, the seat shell here advantageously being designed as a shell-shaped molded part.

In a preferred further development of the child seat, provision can also be made for the seat shell system to have an intermediate frame arranged between the seat shell and the base frame, in which the seat shell can be placed and to which the seat shell can preferably be releasably attached with appropriately provided anchoring means. In this case, the second belt guide area is determined essentially along the periphery of this intermediate frame. In principle, the second belt guide area and thus the guide sequence of the seat belt between the seat shell system and the base frame can be influenced by a correspondingly selected shape of the outer periphery of the seat shell or of the intermediate frame. With the provision of the intermediate frame between the seat shell and the base frame, it can be achieved that the seat shell can be fastened in the seat shell system in various adjustable reclining and sitting positions. Of course, other solutions are also conceivable for this.

In order to ensure that the seat shell as such can be removed from the child seat arrangement, it is provided in a preferred further development that the connection element provided on the underside of the seat shell system and the connection element designed complementarily thereto and provided on the base area of the base frame are each designed in such a way that a detachable connection is formed between the base frame and the seat shell system. The connection is preferably released by actuating a correspondingly designed actuating means provided for this purpose. It would be conceivable here to use detachable locking members as connecting elements. Of course, other embodiments are also possible.

In order to ensure that the seat shell or the seat shell system can be locked relative to the base frame, a further preferred further development provides that the seat shell system also has corresponding locking means which interact with the seat shell system on the one hand and the base frame on the other hand in such a way that when the Locking means prevents a rotational movement of the seat shell system relative to the base frame. It would be conceivable here, for example, that the frictional connection between the base frame and the seat shell system formed with the connection element provided on the underside of the seat shell and the connection element correspondingly complementary thereto and provided on the base area of the base frame is made non-rotatable by a correspondingly provided locking means. Suitable locking means are known from the prior art and are not explained in more detail here.

Finally, in a preferred implementation of the child seat according to the invention, provision is made for the base frame to have a shell-shaped molded part and / or a frame. Of course, other embodiments are also conceivable here.

According to a further aspect of the present invention, the use of the fastening system according to the invention for fastening a child seat on a vehicle seat is claimed.

• 1 eine perspektivische, schematische Seitenansicht einer bevorzugten Ausführungsform des erfindungsgemäßen Befestigungssystems, bei welcher ein drehbarer Kindersitz in seiner zweiten Position gezeigt ist, in welcher die Sitzschale entgegen der Fahrtrichtung zeigt;
• 2 eine perspektivische Ansicht auf die Rückseite des Sitzschalensystems des in 1 dargestellten Kindersitzes, der mit der bevorzugten Ausführungsform des erfindungsgemäßen Befestigungssystems an einem nicht dargestellten Fahrzeugsitz gehalten wird; und
• 3 eine perspektivische Ansicht des Kindersitzes gemäß 1 in seiner ersten Position, in welcher die Sitzschale in die Fahrtrichtung des Fahrzeuges zeigt.

A preferred embodiment of the fastening system according to the invention and the child seat according to the invention are explained in more detail below with reference to the accompanying drawings. Show it:

• 1 a perspective, schematic side view of a preferred embodiment of the fastening system according to the invention, in which a rotatable child seat is shown in its second position, in which the seat shell shows against the direction of travel;
• 2 a perspective view of the rear of the seat shell system of FIG 1 child seat shown, which is held with the preferred embodiment of the fastening system according to the invention on a vehicle seat, not shown; and
• 3 a perspective view of the child seat according to 1 in its first position, in which the seat pan points in the direction of travel of the vehicle.

In 1 a preferred embodiment of the fastening system 1 according to the invention is shown, which is a motor vehicle child seat 100 with the help of a seat belt 10 holds on a (not explicitly shown) vehicle seat.
In detail, the in 1 shown child seat 100 from a base frame 101 , which is designed as a frame part in the preferred embodiment shown, and a seat shell system 102 in which a toddler can be placed. In 1 shows the seat shell system 102 against the direction of travel of the vehicle (not explicitly shown). Of course, it is also conceivable that the fastening system according to the invention can be used in a child seat 100 can be used in which the seat shell system 102 not relative to the base frame 101 is rotatably mounted. It would also be conceivable that the base frame 101 is realized in the form of a shell-shaped molded part.

Basically, the child seat to be fastened to the vehicle seat with the fastening system 100 a substantially vertical back area 110 and an essentially horizontally extending floor area 120 on, wherein in the embodiment shown in the figures, the back area 110 and the floor area 120 through the base frame 101 of the child seat 100 is justified. The horizontally running floor area 120 of the child seat 100 is designed to be arranged on a vehicle seat (not explicitly shown), the back area running essentially horizontally 110 adjoins the backrest of the vehicle seat (not explicitly shown). The child seat 100 is on the vehicle seat with an in-vehicle seat belt system 10 held, which belongs to the fastening system.

In detail, it is provided that as a safety belt 10 a vehicle-internal three-point belt system is used. As shown schematically in the figures, the three-point seat belt 10 over a first, second and third point B. and C. connectable to a support structure of the vehicle. The one between the first and second articulation point hidden in the figures B. extending first strap section 13th corresponds to normal use of the seat belt 10 the so-called lap belt section of the seat belt 10 . On the other hand, the one between the second and third articulation point corresponds B. and C. extending second strap section 15th in normal use of the seat belt 10 the shoulder strap section of the seat belt 10 .

The fastening system according to the invention is essentially for the child motor vehicle seat 100 designed over two belt guide sections 3 and 5 the child seat 100 to hold at or on the vehicle seat. The first belt guide area or section 3 is thereby provided with first guide means 2 set which on a front, facing in the direction of travel section 121 of the floor area 120 of the child seat 100 are provided. In the preferred embodiment shown in the figures, this is the front section pointing in the direction of travel 121 of the floor area 120 through the front edge of the essentially horizontally extending floor area 120 of the child seat 100 set.

In detail, the first belt guide area 3 with the first guide means 2 defined, which serve the first strap section 13th the seat belt 10 over the first belt guide area 3 respectively. It would be conceivable as a first guide 2 Use eyelet elements or eyelet-like elements through which the first strap section 13th to be led. On the other hand, it would of course also be conceivable, in addition to or as an alternative to the loop-like elements, to use any type of guide means that allow the first strap section 13th in a reliable manner via the first belt guide section 3 to be led. For this purpose, for example, protruding pins or sections come into consideration that are located on the first belt guide area 3 are arranged around the first strap section 13th reliably over the first belt guide area 3 to run. It would also be conceivable to use the first guide means 2 to equip with at least one, preferably manually operable, locking element, in particular a clamping element, around the first strap section 13th at the first belt guide area 3 to lock and a relative movement of the first strap section 13th in relation to the first belt guide area 3 to prevent.

The fastening system according to the invention for the child seat 100 has - next to the first belt guide area 3 preferably on Floor area 120 of the child seat 100 - Furthermore, a second management area 5 on, the one with the second guide means 4th at a section pointing in the direction of travel 111 of the back area 110 of the child seat 100 is determined. In the preferred embodiment of the fastening system 1 according to the invention shown in the figures, the section pointing in the direction of travel is located 111 of the back area 110 , at which the second belt guide area 5 is provided on the side of the essentially vertical back area pointing in the direction of travel 110 of the child seat 100 . Of course, it would also be conceivable that in one case, when the child seat to be attached 100 not designed as a rotatable child seat 100 is formed, the second belt guide area 5 on the side of the seat shell system facing in the direction of travel 102 of the child seat 100 is provided.

The second guide means are according to the invention 4th such on the vertically running back area 110 of the child seat 100 arranged that the with these second guide means 4th defined second belt guide area 5 runs essentially diagonally, so that the belt direction of the second belt guide area 5 running second belt section 15th has both a vertical and a horizontal directional component. This diagonal belt guide ensures that the seat belt used in the fastening system 10 essentially along the original for the seat belt 10 intended route runs. Basically, there should be between the belt guide direction in the second belt guide area 5 and the horizontal an angle between 20 ° to 70 °, and preferably between 30 ° to 60 °, and even more preferably about 35 °. With these angular ranges it has been shown that, on the one hand, the child seat is reliable 100 participates optimally in the overall deceleration of the vehicle even in extreme situations, as the seat belt system retracts 10 as well as an optionally provided belt tensioner mechanism work without restrictions. On the other hand, this is the total length of the seat belt used 10 relatively small, so that the fastening system can also be used effortlessly with all types of vehicles.

As a second guide element 4th In principle, any type of guide links with which the diagonally extending second belt guide section can be used 5 is determinable. In particular, eyelet elements or eyelet-like elements come into question here. On the other hand, it would be conceivable to provide guide slots through which the second belt section 15th runs and so in the diagonal second belt section 5 is held.

Although the provision of the diagonally extending second belt guide area 5 prevented the second strap section 15th on its course between the second and third articulation point B. and C. the seat belt 10 undergoes strong deflections, however, depending on the design of the second belt guide area 5 still certain deflections of the second belt section 15th inevitable. However, these are only deflections on the order of about 20 °, so that the seat belt is wedged 10 is as good as impossible even in extreme situations. It would of course be optionally conceivable at the respective deflection points B. and C. appropriate pulleys to be provided.

The following briefly describes the rotatable child seat shown in the figures 100 described, which is held with the fastening system according to the invention on the vehicle seat.

The child seat 100 has - as already indicated - the seat shell system 102 on, which is shown in the figures as a correspondingly shaped lattice body. The seat shell system 102 consists essentially of a seat shell 103 , in which the child or baby is placed and buckled during the journey, and from one on the underside of the seat shell system 102 provided connecting element. In the assembled state, this connecting element engages with a correspondingly complementary design and on the bottom area 120 of the base frame 101 provided connecting element, so that between the base frame 101 and the seat shell system 102 a non-positive connection is formed, with the seat shell system at the same time 102 about a substantially vertical axis of rotation formed with the connecting elements Z relative to the base frame 101 is rotatable or adjustable.

The 1 to 3 show different rotational positions of the seat shell system 102 relative to the base frame 101 , starting with the second position in which the seat shell 103 shows against the direction of travel of the vehicle (not shown) up to the first position in which the seat shell 103 points in the direction of travel.

Independent of the swivel position of the seat shell system 102 relative to the base frame 101 of the child seat 100 becomes the entire child seat 100 held securely on the vehicle seat by means of the fastening system 1. In one case when the seat shell system 102 of the rotatable child seat shown in the figures 100 points in the direction of travel, the seat belt runs 10 of the fastening system 1 over the section of the back area pointing in the direction of travel 110 of the child seat 100 , and in detail between the outer periphery of the seat shell 103 of the seat shell system 102 and the side of the vertically extending back area pointing in the direction of travel 110 , the one in the rotatable child seat 100 through the vertically running component of the base frame 101 is justified.

Although not explicitly shown, the child seat is 100 advantageously carried out in such a way that the seat shell 103 from the base frame 101 can be separated. It would be conceivable here that the seat shell 103 for example with a detachable snap connection to the seat shell system 102 is connected, which in turn has the connecting element on its underside, which is formed in the complementary thereto and on the bottom area 120 of the base frame 101 provided connecting element can be brought into engagement.

The seat shell system preferably has 102 of the child seat 100 also an intermediate frame 105 on, the one between the seat shell 103 and the base frame 101 is arranged, and in which the seat shell 103 settable and on which the seat shell 103 can be preferably detachably attached with appropriately provided anchoring means. The intermediate frame 105 or the anchoring means between the intermediate frame on the seat shell 103 are designed in such a way that the seat shell 103 in various adjustable lying and sitting positions in the seat shell system 102 can be attached.

List of reference symbols

2

first guide means

3

first belt guide area

4th

second guide means

5

second belt guide area

10

Seat belt

13th

first strap section

15th

second strap section

100

child seat

101

Base frame

102

Seat shell system

103

Seat shell

105

Intermediate frame

110

Back area

111

upper section of the back area

120

Floor area

121

front section of the floor area

B, C

second and third articulation points

Z

Axis of rotation

Claims (16)

Fastening system for a motor vehicle child seat (100), in which a seat belt (10) is used to fasten the child seat (100) to a vehicle seat, wherein the child seat (100) has a substantially vertically extending back region (110) and a substantially has a horizontally extending floor area (120) and is designed to be arranged with the floor area (120) on the seat surface of the vehicle seat and to be held there with the safety belt (10); - The seat belt (10) can be connected to a support structure of the vehicle via a first, second and third point (B, C) and a first belt section (lap belt; 13) extending between the first and second point (B) and one between the second and third point (B, C) extending second strap portion (shoulder strap; 15); and - the fastening system has first guide means (2) which are provided on a front section (121) of the floor area (120) of the child seat (100) pointing in the direction of travel and define a first belt guide area (3) over which the first belt section ( 13) of the seat belt (10), characterized in that the fastening system also has second guide means (4) which are provided on a section (111) of the back area (110) of the child seat (100) pointing in the direction of travel and a diagonal there Define extending second belt guide region (5) over which the second belt section (15) of the seat belt (10) is at least partially guided. Fastening system according to Claim 1 , an angle between 20 ° to 70 °, preferably between 30 ° to 60 °, being included between the belt guide direction in the second belt guide region (5) and the horizontal. Fastening system according to Claim 1 or 2 , wherein the second belt guide area (5) is formed on an upper section of the back area (110) with the second guide means (4). Fastening system according to one of the preceding claims, wherein the second guide means (4) have at least one receiving element for receiving the second strap section (15). Fastening system according to Claim 4 , wherein the at least one receiving element is designed, to accommodate the second belt section (15) in such a way that it is preferably slidably supported over the second guide region (5). Fastening system according to one of the preceding claims, wherein the second guide means (4) have at least one eyelet element or an eyelet-like element through which the second belt section (15) is guided. Fastening system according to one of the preceding claims, wherein the second guide means (4) have at least one, preferably manually operable locking element, in particular a clamping element, in order to lock the second belt section (15) on the second belt guide area (5) and for a relative movement of the second belt section (15) ) in relation to the second belt guide area (5). Use of the fastening system according to one of the preceding claims for fastening a child seat (100) on a vehicle seat (200). Child seat (100) with a fastening system according to one of the Claims 1 to 7th , wherein the child seat (100) has a base frame (101) which has the essentially vertically running back area (110) and the essentially horizontally running floor area (120), and a seat shell system (102) which has a seat shell (103) and a connecting element preferably provided on the underside of the seat shell system (102), the connecting element being able to be brought into engagement with a connecting element which is correspondingly complementary thereto and is preferably provided on the bottom area (120) of the base frame (101) in such a way that between the base frame (101) and the seat shell system (102) forms a non-positive connection, and wherein the second belt guide area (5) is arranged between the surface of the back area (110) pointing in the direction of travel and the surface of the seat shell system (102) pointing against the direction of travel. Child seat after Claim 9 , the seat shell system (102) about a substantially vertical axis of rotation (Z) formed with the connecting elements relative to the base frame (101) between a first position in which the seat shell (103) points in the direction of travel and a second position in which the seat shell (103) points against the direction of travel, is rotatable or adjustable. Child seat after Claim 9 or 10 wherein the seat shell (103) is designed as a shell-shaped molded part, and wherein the second guide region (5) extends essentially along the periphery of the molded part. Child seat after Claim 9 or 10 , wherein the seat shell system (102) furthermore has an intermediate frame (105) arranged between the seat shell (103) and the base frame (101), in which the seat shell (103) can be placed and on which the seat shell (103) can preferably be detached with appropriately provided anchoring means can be fastened, the second guide region (5) extending essentially along the periphery of the intermediate frame (105). Child seat after Claim 12 wherein the intermediate frame (105) is designed in such a way that the seat shell (103) can be fastened in various adjustable lying / sitting positions in the seat shell system (102). Child seat according to one of the Claims 9 to 13th , wherein the connecting element, which is preferably provided on the underside of the seat shell system (102), and the connecting element designed complementarily thereto and preferably provided on the bottom area (120) of the base frame (101) are designed in such a way that between the base frame (101) and the seat shell system (102) a releasable connection is formed. Child seat according to one of the Claims 9 to 14th , wherein the seat shell system (102) furthermore has actuatable locking means which interact with the seat shell system (102) on the one hand and the base frame (101) on the other hand in such a way that when the locking means are actuated, a rotary movement of the seat shell system (102) relative to the base frame (101) is prevented . Child seat according to one of the Claims 9 to 15th , wherein the base frame (101) has a shell-shaped molded part and / or a frame.

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