WO2016191101A1

WO2016191101A1 - System for fastening at least one component on a carrier component of a motor vehicle

Info

Publication number: WO2016191101A1
Application number: PCT/US2016/031862
Authority: WO
Inventors: Manuel Huebner; Markus Ferdinand
Original assignee: Illinois Tool Works Inc
Current assignee: Illinois Tool Works Inc
Priority date: 2015-05-27
Filing date: 2016-05-11
Publication date: 2016-12-01
Anticipated expiration: 2017-11-27
Also published as: DE102015108347A1; CN107636323A

Abstract

The invention relates to a system for fastening at least one component on a carrier component of a motor vehicle, comprising a housing part with a receptacle and a pin which is insertable into the receptacle, wherein the housing part has a fastening portion with which said housing part is fastenable on an opening in the carrier component, and wherein at least one component to be fastened on the carrier component can be held using the system, wherein the receptacle in the housing part contains two elastic spring arms which, when the pin is inserted into the receptacle, latch against latching projections of the free end of the pin, wherein the spring arms each have a force transmission surface, and wherein the latching projections of the pin each have a force transmission surface, wherein, when the pin is inserted into the housing part, the force transmission surfaces of the latching projections in each case lie opposite a force transmission surface of one of the spring arms, wherein the force transmission surfaces each lie in surfaces which are oblique or curved in relation to the insertion direction of the pin into the receptacle, and therefore a tensile force acting on the pin from the receptacle produces a force of the spring arms, the force acting radially inwards with respect to the pin.

Description

SYSTEM FOR FASTENING AT LEAST ONE COMPONENT ON A CARRIER

COMPONENT OF A MOTOR VEHICLE

The invention relates to a system for fastening at least one component on a carrier component of a motor vehicle, comprising a housing part with a receptacle and a pin which is insertable into the receptacle, wherein the housing part has a fastening portion with which said housing part is fastenable on an opening in the carrier component, and wherein at least one component to be fastened on the carrier component can be held using the system, wherein the receptacle in the housing part contains two elastic spring arms which, when the pin is inserted into the receptacle, latch against latching projections of the free end of the pin.

Systems of this type are used to fasten, for example, panel parts to bodies of cars. The housing part is fastened with the fastening portion on an opening in the carrier component, for example in a body part. The component to be fastened to the carrier component is subsequently placed onto the housing part in such a manner that an opening in the component is aligned with the receptacle for the pin. The pin can subsequently be inserted into the receptacle, wherein the component is then securely held between bearing surfaces of the housing part and the pin. Latching connections are known both for fastening the housing part to the carrier component and for fastening the pin in the housing part. There is fundamentally the desire here for installation forces which are as small as possible. On the other hand, holding forces which are as large as possible, in particular in the event of tensile forces directed toward releasing the component from the carrier component, are intended to be able to be realized during operation. These two requirements are generally a conflict of aims.

Starting from the explained prior art, the invention is therefore based on the object of providing a system of the type mentioned at the beginning which realizes high holding forces during operation while having simple installation and low installation forces. The invention achieves the object by a system as claimed in claim 1. Advantageous refinements are found in the dependent claims, the description and the figures.

For a system of the type mentioned at the beginning, the invention achieves the object in that the spring arms each have a force transmission surface, and in that the latching projections of the pin each have a force transmission surface, wherein, when the pin is inserted into the housing part, the force transmission surfaces of the latching projections in each case lie opposite a force transmission surface of one of the spring arms, wherein the force transmission surfaces each lie in surfaces which are oblique or curved in relation to the insertion direction of the pin into the receptacle, and therefore a tensile force acting on the pin from the receptacle produces a force of the spring arms, the force acting radially inwards with respect to the pin. The invention also relates to a carrier component and at least one component fastened thereto using at least one system according to the invention.

The system according to the invention serves, for example, for fastening panel parts to body parts of a car. For example, sill panels or underbody panels can be fastened to the vehicle body using the system according to the invention. The housing part can be composed integrally from plastic. The pin can also be composed integrally from plastic. The housing part and/or the pin can be produced in a particularly simple manner in a plastics injection molding process. The system according to the invention comprises the housing part and the pin which is insertable in a receptacle in the housing part. The insertion direction of the pin into the receptacle generally corresponds here to the longitudinal axis of the pin. By inserting the pin into the receptacle in the housing part, the elastic spring arms of the housing part latch against the latching projections of the free end of the pin, and therefore the pin is held securely in the receptacle in the housing part in the latched state. The installation can take place in a simple manner by pressing the pin into the receptacle of the housing part.

The latching projections of the pin and the spring arms of the housing part each have a force transmission surface, wherein the force transmission surfaces of the latching projections and the force transmission surfaces of the spring arms lie opposite one another in pairs when the pin is inserted into the housing part. The force transmission surfaces transmit forces acting on the system, for example tensile forces, compressive forces or the like, during operation, i.e. when at least one component is fastened to the carrier component using the system. Said force transmission surfaces in particular do not participate in the latching of the pin in the receptacle in the housing part. In the fitted state of the system, the force transmission surfaces lying opposite one another in pairs can be in contact with one another or spaced apart slightly from one another. At any rate, they are in contact with one another when, for example, tensile forces occur during operation and then transmit the tensile forces. A tensile force which occurs during operation and is transmitted by the force transmission surfaces is directed here counter to the insertion direction of the pin into the receptacle.

According to the invention, the force transmission surfaces lie in planes which are oblique or curved in relation to the insertion direction of the pin. For example, in the case of oblique planes, an angle between the insertion direction and the respective plane is correspondingly > 0° and < 90°. For example, such an angle can lie within a range of between 65° and 85°. The arrangement according to the invention of the force transmission surfaces in planes which are oblique or curved in relation to the insertion direction leads to a tensile force acting on the system during operation producing a force of the spring arms, the force acting radially inward with respect to the pin. When a tensile force occurs, the spring arms are therefore pressed radially inward against the pin. The tensile force therefore increases the holding force of the system. Release of the pin portion by exertion of a tensile force in the mounted state of the pin is ultimately possible only by destruction of the components involved. In this manner, while the installation forces continue to be low, a holding force which is considerably increased in relation to conventional systems can thereby be achieved. At the same time, the system according to the invention is distinguished by cost-effective production and universal usability.

When the pin is inserted into the receptacle, a clearance, in which a first component which is to be fastened on the carrier component and has an opening can be accommodated and held, can be formed between a contact surface of the housing part and a contact surface of the pin. According to a further refinement, the contact surface of the pin can be formed by a contact flange arranged at the head end of the pin opposite the free end of the pin. The housing part can furthermore be provided with a seal which is mounted thereon or injection molded thereon in a plastics injection molding process, for example in a manner encircling the contact flange. With such a seal, in the mounted state the opening in the carrier component, for example a reveal of the opening, can be sealed.

The receiving opening can be designed in such a manner that the pin is rotated over the course of the insertion into an installation position in which the spring arms of the housing part can latch against the latching projections of the pin. As a result, the installation is further facilitated since the rotational position required for the installation is predetermined. Furthermore, the housing part, when fastened on the opening in the carrier component, can rest with a fastening flange on a surface of the carrier component, wherein the fastening flange is arranged at a distance from the contact surface of the housing part in the insertion direction of the pin into the receptacle. The component is then held on the carrier component at a defined distance therefrom.

It is furthermore possible for that end of the housing part which faces away from the fastening portion to have an elongate retaining projection with two free ends, wherein the free ends of the elongate retaining projection can engage behind an elongated hole in a second component, which is to be fastened on the carrier component, in order to hold the second component.

The system according to the invention can therefore be used in particular to fasten two components to the carrier component, for example to a body part of a car, wherein the first component can be, for example, an underbody panel, in particular composed of plastic, and the second component can be, for example, a sill panel, in particular composed of plastic. For the installation, the second component, for example a sill panel, is first of all mounted on the housing part. For this purpose, the elongate retaining projection is inserted into an elongated hole of the second component, said elongated hole having, for example, substantially the same cross section as the elongate retaining projection, with the longitudinal axes of elongated hole and elongate retaining projection being coaxial with respect to each other. The housing part is subsequently rotated by 90° in relation to the second component, and therefore the longitudinal axes of elongate retaining projection and elongated hole run perpendicular to each other and the free ends of the elongate retaining projection then engage behind the elongated hole in the second component. In this state, the second component is held by the elongated hole thereof between the elongate retaining projection and, for example, a fastening flange of the housing part, for example in a clamping manner. In this rotated state, the elongated hole can permit a lateral displacement of the housing part in the elongated hole for adaptation to possible component tolerances. The housing part is then fastened to the carrier component by the second component by insertion of the fastening portion into an opening in the carrier component. The first component, for example an underbody panel, is subsequently placed with the opening thereof oriented with respect to the insertion opening, which is defined by the elongate retaining projection, for the pin onto the housing part such that the pin can subsequently be pressed through the first component into the receptacle and latched therein. In said ready mounted state, the first component is then securely held, for example, between a contact flange of the pin and a contact surface of the housing part, which contact surface is formed by the elongate retaining projection. The second component in the mounted state can be held in each case at a distance between the first component and the carrier component.

For a particularly uniform and effective, radially inwardly directed force of the spring arms when a tensile force occurs, the mutually opposite force transmission surfaces of the latching projections and of the spring arms each can lie in mutually parallel planes.

The spring arms can be connected to the housing part in a manner lying diametrically opposite each other with respect to the receptacle for the pin. According to a further refinement, it can be provided that the spring arms each have an elastic longitudinal portion extending from the connection of said spring arms to the housing part perpendicularly to the insertion direction of the pin, wherein the longitudinal portions of the spring arms run parallel to one another and delimit the receptacle for the pin therebetween. The spring arms can be connected to the housing part, for example to a contact flange bearing against a component, in each case at a distance from the receptacle. The abovementioned refinements result in particularly simple deformability of the spring arms and therefore in a particularly low installation force. At the same time, by means of the arrangement of the spring arms, an automatic alignment of the pin occurs during the insertion into the receptacle.

According to a further refinement, it can be provided that the pin has a pin portion and a latching portion which is formed at the free end of the pin and tapers in the direction of the free end of the pin, wherein the latching projections are formed by steps at the transition of the pin section into the latching portion. In this refinement, steps which form the latching projections are provided at the transition of the pin portion into the latching portion which is of enlarged cross section. The cross section of the pin is therefore enlarged in a stepped manner in the transition of the pin portion into the latching portion. When the pin is inserted into the receptacle, the spring arms are first of all pushed apart and then engage in a latching manner behind the steps at the transition between the latching pin portion and the latching portion such that the force transmission surfaces lie opposite one another in pairs.

The cross section of the pin portion, as seen in a first side view, can be smaller than in a second side view rotated by 90° in relation to the first side view. In particular, the pin portion and the latching portion, as seen in the first side view, can form an arrow shape. The cross section of the pin, as seen in the first side view, can increase at the transition of the pin portion into the latching portion and, as seen in the second side view, can remain the same at the transition of the pin portion into the latching portion. Furthermore, it is possible that the cross section of the pin portion, as seen in the second side view, is larger than the clear width between the longitudinal portions of the spring arms. In addition, it is possible for the cross section of the pin portion, as seen in the first side view, not to be larger than the clear width between the longitudinal portions of the spring arms. In the abovementioned refinements, simple removal of the pin from the housing part is possible by rotating the pin by 90° about the longitudinal axis of the pin portion out of the installation position. When the pin is installed in the receptacle of the housing part, the spring arms engage behind the step-shaped latching projections of the pin. If the pin is rotated by 90° about the longitudinal axis of the pin portion, the spring arms are pushed apart by the cross section of the pin portion increasing over the course of the rotation of the pin portion, and the pin portion can be released from the receptacle and in particular from the engagement with the spring arms since the latching portion provided at the free end of the pin is not increased in cross section in relation to the pin portion in this state rotated by 90°. The removal is therefore possible in a particularly simple manner. At the same time, the pin portion is automatically aligned by said cross-sectional configuration during the insertion into the receptacle. The rotation for removal purposes can take place manually or using a removal tool. The pin head can have an engagement opening for a removal tool. After the pin has been removed, the first component, for example an underbody panel, can be released from the carrier component. By subsequent rotation of the housing part by 90° in relation to the second component, for example a sill panel, the second component with the elongated hole thereof can subsequently also be released from the housing part, in particular from the elongate retaining projection.

According to a particularly practical refinement, the fastening portion of the housing part can comprise a plurality of elastic latching legs which, when the housing part is inserted into the opening in the carrier component, engage behind the opening in a latching manner. Particularly simple installation is thereby achieved by simply pressing the fastening part into the opening in the carrier component.

An exemplary embodiment of the invention is explained in more detail below with reference to figures, in which, schematically:

Fig. 1 shows a housing part of a system according to the invention in a perspective view, Fig. 2 shows a pin of a system according to the invention in a perspective view, Fig. 3 shows the pin from fig. 2 in a first side view,

Fig. 4 shows the pin from fig. 2 in a second side view rotated by 90° in relation to the first side view shown in fig. 3,

Fig. 5 shows a system according to the invention comprising the housing part shown in fig. 1 and the pin shown in figs. 2 to 4, in a perspective view,

Fig. 6 shows a partially enlarged side view of the system shown in fig. 5,

Fig. 7 shows a partially enlarged perspective view of the system shown in fig. 5,

Fig. 8 shows a further partially enlarged perspective view of the system from fig. 5,

Fig. 9 shows a further partially enlarged view of the system from fig. 5,

Fig. 10 shows a further partial sectional view of the system from fig. 5, and

Fig. 11 shows the system according to the invention, which is shown in fig. 5, in an installation state for the fastening of two components to a carrier component, in a sectional view.

Unless stated otherwise, identical reference numbers in the figures refer to the same objects. Figure 1 shows a housing part of a system according to the invention in a perspective view. Figures 2 to 4 show a pin of a system according to the invention in various views. Fig. 5 shows a system according to the invention comprising the housing part from fig. 1 and the pin from figures 2 to 4 in a mounted state without component(s) and carrier component, in a perspective view. Figures 6 to 10 each show parts of the system according to the invention. For illustrative reasons, part of the system shown in figure 1 is in each case cut away in figures 6 to 10. Fig. 11 shows the system according to the invention, which is shown in Fig. 5, with a first and second component mounted on a carrier component, in a perspective view.

The system according to the invention, which is illustrated in the figures, comprises a housing part 10 which is composed integrally from a plastic and is produced, for example, by a plastics injection molding process. In addition, the system according to the invention comprises a pin 12 which is likewise composed integrally of a plastic and is produced, for example, likewise in a plastics injection molding process. The housing part 10 has a fastening portion 14 with a plurality of elastic latching legs 16 which, in a manner known per se, when the housing part is inserted into an opening in the carrier component, engage behind the opening in a latching manner. The housing part 10 here has a fastening flange 18 which, in the state fastened to the carrier component, rests with a lower side 20 on the surface of the carrier component. The housing part 10 furthermore comprises a contact flange 22. The contact flange 22 is spaced apart from the fastening flange 18 by a cage portion 24. In the mounted state, the contact flange 22 bears with a contact surface 26 against a surface of a second component, as will be explained in more detail below. The housing part 10 furthermore has an elongate retaining projection 15 with two free ends 17. The elongate retaining projection 15 defines an insertion opening 19 for the pin 12. A clearance is formed between the free ends 17 of the elongate retaining projection 15 and the contact flange. In the mounted state, the second component of the elongated hole is held in said clearance, as will be explained in more detail below.

The housing part 10 furthermore forms a receptacle 28 for the pin 12, in particular for a pin portion 30 of the pin 12. The pin portion 30 merges at the free end of the pin 12 into a latching portion 32 tapering in the direction of the free end. Steps at the transition of the pin portion 30 into the latching portion 32 form two latching projections 34. The cross section of the pin 12, as seen in a first side view which is shown here in fig. 3, increases at the transition of the pin portion 30 into the latching portion 32. As seen in this first side view, the pin portion 30 together with the latching portion 32 forms an arrow shape. In a second side view which is rotated in relation to the first side view, which is shown in fig. 3, by 90° about the longitudinal axis 31 of the pin portion 30, which longitudinal axis runs from the top downward in fig. 3, the second side view being shown in fig. 4, the cross section of the pin portion 30 is larger than in the first side view. By contrast, in said second side view, the cross section at the transition of the pin portion 30 into the latching portion 32 remains the same.

Two elastic spring arms 36 are arranged on the housing part 10 at locations diametrically opposite each other with respect to a receiving opening for the pin 12. The connecting points of the spring arms 36 to the housing part are shown at the reference sign 38. Starting from the connecting points 38, the elastic spring arms 36 each have an elastic longitudinal portion 40 extending perpendicularly to the insertion direction of the pin 12 into the receptacle 28, wherein the longitudinal portions 40 run parallel to one another and delimit the receptacle 28 for the pin therebetween. As seen in the second side view, the cross section of the pin portion 30 is larger than the clear width between the longitudinal portions 40 of the spring arms 36. By contrast, in the first side view, the cross section of the pin portion 30 is smaller than or identical to the clear width between the longitudinal portions 40 of the spring arms 36. As a result, removal of the pin from the mounted position, which is shown in fig. 5, is possible in a simple manner by rotation by 90° about the longitudinal axis of the pin portion 30, as illustrated at the reference sign 33 in figures 2 and 3. Over the course of said rotation, because of the cross-sectional enlargement, the spring arms 36, in particular the longitudinal portions 40 thereof, are bent apart, and therefore the latching portion 32 can be pulled out of the housing part past the spring arms 36. This is illustrated in figures 8 and 9.

In addition, the upper sides of the latching projections 34 of the latching portion 32 in each case form a force transmission surface 42, as can be seen for example in figure 3. The lower sides of the longitudinal portions 40 of the spring arms 36, which lower sides face the force transmission surfaces 42 of the latching projections 34 in the mounted state shown in fig. 10, likewise each form a force transmission surface 44. In the mounted state, the force transmission surfaces 44 of the spring arms 36 and the force transmission surfaces 42 of the latching portions 34 lie in pairs opposite one another, as can likewise be seen in figure 10. The force transmission surfaces 42, 44 all lie here in planes which are oblique in relation to the insertion direction of the pin into the receptacle, which insertion direction runs from the top downward in fig. 10. In particular, the mutually opposite force transmission surfaces 42, 44 of the latching projections 34 and of the spring arms 36 each lie in mutually parallel oblique planes. A tensile force, which acts on the system in the mounted state, counter to the insertion direction of the pin 12 into the housing part 10, as illustrated by the arrow 46 in fig. 10, therefore first of all leads to closing of the gap between the mutually facing force transmission surfaces 42, 44. Furthermore, in addition to a tensile force component 48 on the spring arms 36, the tensile force 46 then leads because of the force transmission surfaces 42, 44 to a force of the spring arms 36, which force acts radially inward with respect to the pin portion 30, as illustrated by the reference sign 50 in fig. 10. The retaining force is thereby increased.

It should also be mentioned that the pin 12, at the head end thereof opposite the free end, has a contact flange 52, the lower side of which forms a contact surface 54. In the state mounted on a carrier component, a first component is securely held in the clearance between the contact surface 26 of the contact flange 22 of the housing part 10 and the contact surface 54 of the contact flange 52 of the pin 12, as is explained below. In addition, the contact flange has an engagement opening 53 for engagement of a removal tool with which the pin 10 can be rotated for removal purposes.

The installation of the system according to the invention will now be explained with reference to fig. 11. First of all, the housing part 10 is aligned with the elongate retaining projection 15 thereof in such a manner that the longitudinal axis of the retaining projection 15, which longitudinal axis encloses the two free ends 17, is aligned with the longitudinal axis of an elongated hole 57 in a second component 55, for example a sill panel, and, in this aligned state, the elongate holding projection 15 is inserted into the elongated hole 57. The housing part 10 is subsequently rotated by 90° in relation to the second component 55 such that the free ends 17 of the retaining projection 15 engage behind the elongated hole 57 in the second component 55. The second component 55 is now held between the lower side of the retaining projection 15 and the contact surface 26 of the contact flange 22. The fastening portion 14 of the housing part 10 is subsequently inserted into an opening 59 in a support component 61, for example in a body part of a car, wherein the latching legs 16 engage behind the opening 59 in a latching manner. The carrier component 61 is now held between the latching legs 16 and the lower side 20 of the fastening flange 18. A first component 63, for example an underbody panel, is then aligned with an opening 65 with respect to the receptacle 28 of the housing part 10 and the pin 12 is then pressed into the receptacle 28 with latching at the spring arms 36. In this ready mounted state, the first component 63 is held between the contact surface 54 of the contact flange 52 of the pin 12 and the upper side of the elongate retaining projection 15.

As already explained, for removal purposes the pin 12 merely has to be rotated by 90° about the longitudinal axis thereof. The first component 63 can subsequently be released from the carrier component 61. The second component 55 can then also be released from the housing part 12 and therefore from the carrier component 61 by rotation of the housing part 10 about 90°.

The system according to the invention permits simple installation with low installation forces and simple removal by rotation of the pin 12. At the same time, very high holding forces are realized during operation.

Claims

1. System for fastening at least one component on a carrier component of a motor vehicle, comprising a housing part (10) with a receptacle (28) and a pin (12) which is insertable into the receptacle (28), wherein the housing part (10) has a fastening portion (14) with which said housing part is fastenable on an opening (59) in the carrier component (61), and wherein at least one component (55, 63) to be fastened on the carrier component (61) can be held using the system, wherein the receptacle (28) in the housing part (10) contains two elastic spring arms (36) which, when the pin (12) is inserted into the receptacle (28), latch against latching projections (34) of the free end of the pin (12), characterized in that the spring arms (36) each have a force transmission surface (44), and in that the latching projections (34) of the pin (12) each have a force transmission surface (42), wherein, when the pin (12) is inserted into the housing part (10), the force transmission surfaces (42) of the latching projections (34) in each case lie opposite a force transmission surface (44) of one of the spring arms (36), wherein the force transmission surfaces (42, 44) each lie in surfaces which are oblique or curved in relation to the insertion direction of the pin (12) into the receptacle (28), and therefore a tensile force (46) acting on the pin (12) from the receptacle (28) produces a force (50) of the spring arms (36), the force acting radially inwards with respect to the pin (12).

2. System according to Claim 1, characterized in that, when the pin (12) is inserted into the receptacle (28), a clearance, in which a first component (63) which is to be fastened on the carrier component (61) and has an opening (65) can be accommodated and held, is formed between a contact surface of the housing part (10) and a contact surface (54) of the pin (12).

3. System according to Claim 2, characterized in that the contact surface (54) of the pin (12) is formed by a contact flange (52) arranged at the head end of the pin (12) opposite the free end of the pin (12).

4. System according to either of Claims 2 and 3, characterized in that the housing part (10), when fastened on the opening (59) in the carrier component (61), rests with a fastening flange (18) on a surface of the carrier component (61), wherein the fastening flange (18) is arranged at a distance from the contact surface of the housing part (10) in the insertion direction of the pin (12) into the receptacle (28).

5. System according to one of the preceding claims, characterized in that that end of the housing part (10) which faces away from the fastening portion (14) has an elongate retaining projection (15) with two free ends (17), wherein the free ends (17) of the elongate retaining projection (15) can engage behind an elongated hole (57) in a second component (55), which is to be fastened on the carrier component (61), in order to hold the second component (55).

6. System according to Claim 5 and one of Claims 2 to 4, characterized in that the second component (55) in the mounted state is held in each case at a distance between the first component (63) and the carrier component (61).

7. System according to one of the preceding claims, characterized in that the mutually opposite force transmission surfaces (42, 44) of the latching projections (34) and of the spring arms (36) each lie in mutually parallel planes.

8. System according to one of the preceding claims, characterized in that the spring arms (36) are connected to the housing part (10) in a manner lying diametrically opposite each other with respect to the receptacle (28) for the pin (12).

9. System according to one of the preceding claims, characterized in that the spring arms (36) each have an elastic longitudinal portion (40) extending from the connection of the said spring arms to the housing part (10) perpendicularly to the insertion direction of the pin (12), wherein the longitudinal portions (40) of the spring arms (36) run parallel to one another and delimit the receptacle (28) for the pin (12) therebetween.

10. System according to one of the preceding claims, characterized in that the pin (12) has a pin portion (30) and a latching portion (32) which is formed at the free end of the pin (12) and tapers in the direction of the free end of the pin (12), wherein the latching projections (34) are formed by steps at the transition of the pin portion (30) into the latching portion (32).

11. System according to Claim 10, characterized in that the cross section of the pin portion (30), as seen in a first side view, is smaller than in a second side view rotated by 90° in relation to the first side view.

12. System according to Claim 11, characterized in that the cross section of the pin (12), as seen in the first side view, increases at the transition of the pin portion (30) into the latching portion (32) and, as seen in the second side view, remains the same at the transition of the pin portion (30) into the latching portion (32).

13. System according to Claim 9 and either of Claims 11 and 12, characterized in that the cross section of the pin portion (30), as seen in the second side view, is larger than the clear width between the longitudinal portions (40) of the spring arms (36).

14. System according to Claim 9 and one of Claims 1 1 to 13, characterized in that the cross section of the pin portion (30), as seen in the first side view, is not larger than the clear width between the longitudinal portions (40) of the spring arms (36).

15. System according to one of the preceding claims, characterized in that the fastening portion (14) of the housing part (10) comprises a plurality of elastic latching legs (16) which, when the housing part (10) is inserted into the opening (59) in the carrier component (61), engage behind the opening (59) in a latching manner.