JP2001266621A - Fixing system for light source attached to reflector of headlight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely fix a light source without being restricted by the structure of a base disk of the light source. SOLUTION: A reflector 10 has an opening 14 and a housing part 24 for a light source 16, and a lock device 50 is rotatably attached to the reflector 10. A holder ring 40 is fixed at a position between the, lock device and the reflector 10, and the light source 16 can be inserted into the housing part 24 with the lock device 50 at the lock release position. The holder ring 40 has three spring arms 42, and three projections 60 are formed in the lock device 50. When the lock device 50 is rotated to the lock position, the spring arms 42 are pressed inward in the radial direction, so that the spring arms 42 cover a base disk 18 of the light source and engage with the base disk. As a result, the light source 16 can be securely held at the reflector 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing system for a light source mounted on a reflector of a headlight, wherein the reflector has an opening and a housing surrounding the opening. The base (base) of the light source can be inserted into the base, and the housing portion has a support portion, and the support portion has a base disk (dish-shaped base) of the light source in the direction of the longitudinal axis of the light source, A lock device is provided which is adapted to abut in a direction parallel to the longitudinal axis of the light source, and which is further mounted on the reflector so as to be rotatable between an unlocked position and a locked position. A light source can be inserted into the housing portion with the lock device disposed at the unlock position. By rotating the lock device to the lock position, the light source can be divided over the entire circumference of the base. Is held in a state where the light source by a plurality of spring arms was abutted to the support portion which acts are concerns of the type adapted to be positioned fixed to the reflector.

[0002]

2. Description of the Related Art A fixing system of this type is known from DE-A-2 939 328. In this known fastening system, the reflector has an opening and a receptacle surrounding the opening. The housing has a support, on which a base disk (disk-type cap) of the light source abuts in the direction of the longitudinal axis of the light source. The reflector is provided with a locking device that is rotatable between an unlocked position and a locked position about a longitudinal axis of the light source. The light source can be inserted into the housing provided on the reflector with the lock device located at the unlock position. At this time, the three protruding portions protruding outward from the base disk of the light source in the radial direction come into contact with the supporting portions provided on the reflector. The locking device has three spring arms protruding corresponding to these protrusions provided on the base disk of the light source. When the locking device is rotated to the locked position, these spring arms engage over the protrusion of the base disk,
As a result, the light source is held by the reflector, that is, the base disk of the light source is held in a state where the base disk is applied to the support. This known securing system only allows reliable fixing with a uniform holding force acting on the base disk, only in a light source with a plurality of radial protrusions on the base disk, which greatly limits its usefulness. Have been.

[0003]

SUMMARY OF THE INVENTION The object of the invention is to improve a fixing system of the type mentioned at the outset so that it acts uniformly on the base disk without being restricted by the structure of the base disk of the light source. It is an object of the present invention to provide a fixing system in which the light source is securely fixed using the holding force.

[0004]

In order to achieve this object, according to the invention, the spring arm is formed as a separate, non-rotatable retaining ring fixed between the reflector and the locking device. The locking device has an additional portion surrounding the spring arm, and inside the additional portion, radially inward in the locking direction corresponding to the number of spring arms provided on the retaining ring. A plurality of projections are formed which rise upwards, provided that the spring arms provided on the retaining ring are radial in the unlocked position of the locking device with respect to the longitudinal axis of the light source, and the base disc of the light source is connected to these spring arms. When the locking device is pivoted to the locked position, the protrusion rides on these spring arms and the spring arm The beam by movement radially inwardly, the spring arm is adapted to engage overlying the base disk.

[0005]

The fastening system according to the invention has the following advantages over the prior art. In other words, reliable fixing of the light source using the holding force acting uniformly on the base disk is achieved, and in this case, whether or not the base disk of the light source has a radial projection, or It does not matter how many radial projections are provided.

[0006] Advantageous refinements of the fastening system according to the invention are described below. The configuration according to claim 2 has the advantage that no additional fixings for the retaining ring are required. A simple mounting of the locking device on the reflector is achieved with the configuration according to claim 3. According to the configuration of the fourth aspect, the base disk of the light source can be reliably pressed against the support portion. According to the configuration described in claim 5, the lock device is prevented from being unintentionally rotated. According to the configuration described in claim 6, it is ensured that the light source is already fixed at the front position after being inserted into the housing portion, and the light source does not fall off the reflector until the locking device is rotated to the locking position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 5 show a reflector 10 of a headlight, in particular a vehicle headlight. The reflector 10 is arranged (not shown) in a housing (not shown) of a headlight. As shown in FIG. 5, the reflector 10 has a concavely curved reflecting surface 1 on its front side.
Two. The reflector 10 is made of a plastic, for example a thermosetting plastic or a thermoplastic, and is manufactured by injection molding. The reflector 10 may have a plurality of sub-regions serving different light functions, each of which corresponds to one dedicated light source. Reflector 1
The vertex range of 0 has an opening 14, into which a light source 16 is inserted. The light source 16 is an incandescent bulb,
For example, it may be a halogen bulb of the type H1, H3, H4 or H7 or a gas discharge bulb.
In the embodiment described below, the light source 16 is a type H7 halogen bulb, which has a base disk (dish base) 18. The base disk 18 is formed in a substantially circular shape, but has a flat portion 19 on the peripheral surface. From the flat portion 19, the light source 1
6 substantially radially with respect to the longitudinal axis 17 of the
0 is protruding. Two connection pins 22 project rearward from the base of the light source 16, and both connection pins 22 serve for electrical contact connection of the light source 16. A connector member (not shown) can be fitted over both connection pins 22.

In order to fix the light source 16 to the reflector 10, a fixing system described in detail below is provided. On the rear side of the reflector 10, a hollow cylindrical housing portion 24 surrounding the opening 14 of the reflector 10 is formed, and this housing portion 24 is used for housing a cylindrical base section 25 provided in the light source 16. work. When the light source 16 is inserted, the cylindrical base section 25 of the light source 16 is
4 is centered. Since the longitudinal axis of the housing 24 is at least approximately aligned with the longitudinal axis 17 of the light source 16, the longitudinal axis of the housing 24 is also referred to below as the “longitudinal axis 17”. The end face of the housing portion 24 facing the side opposite to the reflector 10 is the light source 1.
6 form a support 26 for the base disk 18, in which case the base disk 18 is oriented in the direction of the longitudinal axis 17 of the light source 16 (in a direction parallel to the longitudinal axis 17).
Abuts on the support 26. Also, on the end face of the accommodation portion 24,
The support portion 2 is distributed over the entire circumference of the accommodation portion 24.
A plurality of projections forming 6 may be integrally formed.
Outside the housing portion 24, two ribs 28 project from the rear side of the reflector 10. The groove 2 is provided between the ribs 28.
9 are formed in the groove 29. When the light source 16 is inserted into the accommodation portion 24, the protrusion 2 of the base disk 18 is formed.
0 enters. The light source 16 is based on the two ribs 28,
6 can be inserted into the housing 24 only at a rotational position where the protrusion 20 enters the groove 29. Therefore, the light source 16 is prevented from being assembled at an incorrect rotation position.

Further, two domes 30 are integrally formed on the rear side of the reflector 10 so as to surround the accommodating portion 24 and to be substantially diametrically opposed to each other. One end 31 of each dome 30 has one hole 31
have. On the end face of the dome 30, furthermore, one raised web 33 is formed, and the width of the web 33 is formed smaller than the diameter of the dome 30. Both webs 33 are located at least approximately along one common arc. Another rib 34 is integrally formed on the rear side of the reflector 10 in a circumferential range between the two domes 30. The radially outwardly facing surfaces of these ribs 34 are arranged at least approximately along an arc coaxial with the common arc of the web 33. Rib 28
The radially outwardly facing surfaces of the webs 33 are also advantageously arranged at least approximately along an arc coaxial with the common arc of the web 33. The dome 30 is located along an arc having a larger diameter than the web 33 and the rib 34. Behind the reflector 10, the rib 2
A support 36 surrounding the ribs 8, the ribs 34 and the dome 30 is formed. The support 36 is at least substantially flat and arranged at right angles to the longitudinal axis 17 of the housing 24. On the rear side of the reflector 10, another rib 38 is integrally formed.
And a diameter larger than that of the rib 34. The radially inwardly facing inner surface of the rib 38 has two recesses 39 spaced circumferentially from each other, both recesses 39 being substantially parallel to the longitudinal axis 17. An extending groove is formed.

As part of the fixing system for the light source 16, a retaining ring 40 is applied to the rear side of the reflector 10. The contour of this retaining ring 40 is adapted to the rear side of the reflector 10. Retaining ring 40 is rib 2
8, 34 and the dome 30 and
Is in contact with In the area of the dome 30, the retaining ring 4
0 has a bulging portion 41 as shown in FIG. On the inner edge of the retaining ring 40, a plurality of, for example, three spring arms 4 distributed over the entire circumference of the retaining ring 40.
2 are sticking out. The free ends of these spring arms 42 are oriented away from the reflector 10. The spring arm 42 is resiliently movable in a radial direction with respect to the longitudinal axis 17 of the receiving part 24. The free end of the spring arm 42, as shown in FIGS.
It is bent into a hollow profile, in this case having a side edge 43 facing the spring arm 42 reflector 10. The side edge 43 is inclined so as to extend in a direction away from the reflector 10 inward in the radial direction as shown in FIG. The reflector 10 at the end of the spring arm 42
Viewed from the rear side in the direction of the longitudinal axis 17, the edges 44 are oriented in a counterclockwise direction, the edges 44 extending radially inward in a counterclockwise direction, whereby the respective It is inclined to form one climbing slope. The spring arms 42 are unevenly distributed over the entire circumference of the retaining ring 40, and when the retaining ring 40 is disposed on the reflector 10, the spring arms 42
Line up beside 8,34. Due to the uneven distribution of the spring arms 42, the retaining ring 40 can only be arranged on the reflector 10 in one and only one rotational position. Spring arm 42 located between ribs 28, 34
The bulge 41 surrounding the dome 30 fixes the position of the retaining ring 40 so that the retaining ring 40 cannot rotate about the longitudinal axis 17 when it is arranged on the reflector 10.

The retaining ring 40 further has a locking arm 45 protruding from the inner edge thereof. The free end of the locking arm 45 is directed away from the reflector 10. When the retaining ring 40 is disposed on the reflector 10, the locking arm 45 moves the groove 2 between the two ribs 28.
9. Free end 46 of locking arm 45
Is formed to be bent inward in the radial direction as shown in FIG. The retaining ring 40 is
When the light source 16 is inserted into the accommodating portion 24 in a state where the light source 16 is disposed at the position, the protrusion 20 provided on the light source 16 slides so as to ride on the locking arm 45 via the slope when entering the groove 29. As a result, the locking arm 45 is spring-elastically pressed outward in the radial direction.
0 can pass beside the locking arm 45. When the base disk 18 of the light source 16 comes into contact with the support portion 26, the locking arm 45 is moved inward in the radial direction.
Locked so as to cover 0. The light source 16 from the accommodation section 24
Is pulled out, the projection 20 of the light source 16 slides so as to ride on the locking arm 45 also via the slope, whereby the locking arm 45 is pressed radially outward, and the projection 20 is It can pass beside the locking arm 45. The retaining ring 40 preferably consists of a sheet, and the spring arm 42 and the locking arm 45 are formed integrally with the sheet and project from the sheet by bending.

As another part of the fixing system for the light source 16, a locking device 50 is mounted behind the reflector 10. The locking device 50 is formed in an annular shape and has an edge portion 51 protruding radially inward at a substantially right angle to the longitudinal axis 17 of the housing portion 24. The edge portion 51 has bulges 52 in a range corresponding to the dome 30 of the reflector 10, and these bulges 52 cover the dome 30. Each bulge 52 has one long hole 53 formed therein.
Web 33 penetrates this long hole 53. Lock device 5
The long slots 53 are curved so as to draw at least substantially the same arc as the web 33. The locking device 50 is connected to the reflector 10 by two screws 54.
In this case, one screw 54 is screwed into the hole 31 provided in the dome 30 through the corresponding long hole 53 of the locking device 50. The screw 54 has a head 55.
The diameter of 5 is formed larger than the width of the web 33 and the width of the long hole 53. The screw 54 is screwed into the hole 31 until its head 55 rests on the end face of the web 33. In this case, the head 55 of the screw 54 covers the bulge 52 of the locking device 50 beside the slot 53, so that the locking device 50 is fixedly positioned in the reflector 10 in the direction of the longitudinal axis 17 of the housing 24. However, it is pivotable about a longitudinal axis 17. Lock device 50
The bulging portion 52 is formed with a slope 56 that rises in the direction of the longitudinal axis 17 toward the end of the long hole 53 counterclockwise, in line with the long hole 53. May be.

The edge 51 of the locking device 50 has a cross-sectional extension 57 in the area corresponding to the rib 28, so that the groove 29 between the ribs 28 remains open. Cross section extension 5
Reference numeral 7 denotes a circumferential direction, which has a larger width than the rib 28,
Thereby, the locking device 5 around the longitudinal axis 17
Zero rotation is possible. The locking device 50 has a substantially hollow cylindrical attachment 58, which surrounds the ribs 28, 34 of the reflector 10. Lock device 50
Is a web 33 engaged in a slot 53 provided in the locking device 50 during its rotation about the longitudinal axis 17.
And the ribs 28 and 34 arranged inside the attachment portion 58.

Inside the attachment portion 58 of the lock device 50,
As shown in FIG. 4, the transition to the edge 51 has three protrusions 60 corresponding to the number of spring arms 42 of the retaining ring 40.
Are distributed over the entire circumference of the lock device 50, and the projections 60 are raised radially inward. Edges of these projections 60 which are oriented in a counterclockwise direction as viewed in the locking device 50 shown in FIG.
Each has one slope 61. Lock device 50
1, a spring-elastic locking element 62 in the form of an arm is formed. The locking element 62 is formed, for example, by two slits formed in the attachment portion 58 extending from the end face of the attachment portion 58 on the side facing the reflector 10 on the side opposite to the reflector 10. At the end, the attachment portion 58
It is integrally molded with. The locking element 62 is resiliently movable in the radial direction with respect to the longitudinal axis 17.

Hereinafter, the mounting of the fixing system and the light source 16 will be described. When assembling the fixing system,
First, since the retaining ring 40 is disposed behind the reflector 10, the retaining ring 40 is in contact with the support portion 36, and the spring arm 42 and the locking arm 45 of the retaining ring 40 are provided.
Are directed away from the reflector 10.
The retaining ring 40 can only be arranged on the reflector 10 in one rotational position as already explained above. Subsequently, the locking device 50 is connected to the dome 3 with the attached portion 58 facing forward.
The reflector 10 is disposed so as to cover the zero and the ribs 28, 34, 38. The locking device 50 includes the reflector 10
Web 33 provided on the dome 30 of the
Can be assembled only at a rotational position that can pass through the long hole 53. Further, the locking device 50 is
It can only be assembled in a rotational position in which the zero projection 60 is arranged circumferentially offset with respect to the spring arm 42 of the retaining ring 40. This defines a unique rotational position at which the locking device 50 must be assembled. The locking device 50 is then fixed in position on the reflector 10 by means of a screw 54, in which case the retaining ring 40 is attached to the reflector 58 of the attachment 58 of the locking device 50.
The position is fixed between the end face facing the zero and the support portion 36 provided on the reflector 10. Lock device 50
Since a plurality of axial projections 59 distributed over the entire circumference of the lock device 50 are formed on the end face of the attachment portion 58, the retaining ring 40 is pressed against the support 36 over the entire circumference. Instead, it is pressed against the support 36 only in the circumferential range corresponding to the protrusion 59.

The locking element 62 of the locking device 50
In the required rotational position for assembly, the locking element 62 is arranged to enter into a recess 39 of the rib 38 which is arranged in a counterclockwise direction.
The rib 38 is disposed outside the attachment portion 58 of the lock device 50. The rotation position at which the lock device 50 is assembled is the unlock position of the lock device 50. That is, in this unlocked position, the spring arm 42 of the retaining ring 40 is not affected by the lock device 50. The spring arms 42 are in this case spaced from the longitudinal axis 17 of the housing 24 such that the base disk 18 of the light source 16 can pass between these spring arms 42. The locking device 50 is shown in the unlocked position in FIG.

When the locking device 50 is in the unlocked position described above, the light source 16 can be inserted into the housing 24. At this time, the cylindrical base section 25 of the light source 16 enters the housing portion 24, and the projection 20 is
Enter within 9. The projection 20 pushes the locking arm 45 of the retaining ring 40 outward when the light source 16 is inserted, and thereafter the base disk 1 of the light source 16
8 contacts the support 26. At this time, the locking arm 4
5 is locked to the protruding portion 20, thereby temporarily fixing the position of the light source 16, so that the light source 16 does not fall out of the housing portion 24. After the light source 16 is inserted into the housing 24, the locking device 50 can be turned to the locking position in the clockwise direction indicated by the arrow in FIG. 2 when the reflector 10 is viewed from the rear side. FIG. 3 shows the locking device 50 in the locked position. When the locking device 50 is rotated to the locking position, the projections 60 provided on the attachment portions 58 of the locking device 50 are formed by the inclined surfaces 61 of these projections 60 and the inclined edges of the spring arms 42 of the retaining ring 40. It slides over the end of the spring arm 42 of the retaining ring 40 via the part 44. At this time, the spring arm 42 is pressed radially inward with respect to the longitudinal axis 17 so that the spring arm 42 engages over the base disk 18 of the light source 16 and
Side edge 43 acts on base disk 18. Side edge 43
Due to the fact that they are inclined, these side edges 43 also exert a force on the base disk 18 in the direction of the longitudinal axis 17 towards the support 26 of the reflector 10 during a radially inward movement. Therefore, the light source 16
Is secured to the reflector 10 by the spring arm 42 secured via the projection 60 of the lock device 50, and is securely held. Due to the slope 56 provided alongside the slot 53 of the locking device 50, the locking device 50 is moved toward the reflector 10 in the direction of the longitudinal axis 17 by the head 55 of the screw 54 when pivoting to the locking position. . When the retaining ring 40 is pressed against the support portion 36 by the protrusion 59, the retaining ring 40 is
During the elastic resilient engagement of the two, it is elastically deformed in the circumferential region between the projections 59, so that it can automatically adapt to the position of the base disk 18 of the light source 16. When the locking device 50 is pivoted into the locking position, the locking element 62 provided on the locking device 50 is spring-resiliently displaced inward as it rides over the rib 38, and in the locking position the locking element 62 Is again displaced elastically outward and is locked in a recess 39 of the rib 38 arranged clockwise. Thereby, the locking device 5
Zero, unintentional rotation is prevented. A configuration is also conceivable in which the locking element 62 is locked outside the rib 38 toward the inside in the radial direction.

The pivoting movement of the locking device 50 is such that, in both directions of rotation, the two edges of the slot 53 of the locking device 50 which are respectively oriented in the direction of rotation correspond to the respective webs 33 provided on the dome 30. It is limited by the respective abutment of the edge oriented in the direction of rotation.
As an alternative, the locking device 50 can also be provided with an additional stop. In this case, these stoppers abut the head 55 of the screw 54, for example. To remove the light source 16, all that is required is to rotate the locking device 50 in a counterclockwise direction to the unlocked position. As a result, the spring arms 42 of the retaining ring 40 pivot away from each other again outward, and the base disk 18 of the light source 16 can pass between these spring arms 42. When the light source 16 is pulled out of the housing portion 24, the locking arm 45 is pressed outward by the protrusion 20 of the light source 16, so that the light source 16 can be taken out of the housing portion 24. When the lock device 50 is rotated to the unlock position, if a sufficient torque is applied, the concave portion 39
The locking element 62 is unlocked again in the interior, so that the locking element 62 can be displaced resiliently inward in the radial direction and can get over the rib 38. In the unlocked position, the locking element 62 is again engaged with the recess 39 of the rib 38 which is arranged in a counterclockwise direction.
The locking device 50 is prevented from being unintentionally rotated to the locked position.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a reflector and a fixing system for fixing a light source to the reflector.

FIG. 2 is a rear view of the reflector with the locking device of the locking system in the unlocked position.

FIG. 3 is a rear view of the reflector provided with the lock device in the lock position.

FIG. 4 is a schematic view of the locking device as viewed in the direction of arrow IV in FIG. 1;

FIG. 5 is a cross-sectional view of the reflector taken along the line VV in FIG. 3;

[Explanation of symbols]

10 reflectors, 12 reflecting surfaces, 14 apertures,
16 light source, 17 longitudinal axis, 18 base disk, 19 flat portion, 20 protrusion, 22 connection pin, 24 receiving portion, 25 base section, 26 support portion, 28 rib, 29 groove, 30 dome,
31 holes, 33 webs, 34 ribs, 36 support parts, 38 ribs, 39 concave parts, 40 retaining rings, 41 bulges, 42 spring arms, 43 side edges, 44 edges, 45 locking arms, 46 free ends, 50 lock device, 51 edge, 52 bulge, 53 slot, 54 screw, 55 head,
56 slope, 57 cross section expansion part, 58 attachment part,
59 protrusion, 60 protrusion, 61 slope, 62
Locking element

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Gustav Klett Germany Dusslingen-Bra Itenecker 3 (72) Inventor Thomas Brunner Germany Filderstadt im Vogelsang 4 (72) Inventor Uwe Costanzer Germany Biesingen Sinde Strasse 12

Claims (8)

[Claims] A fixing system for a light source mounted on a reflector of a headlight, comprising: a reflector (10).
Has an opening (14) and a housing (24) surrounding the opening (14), and the base (25) of the light source (16) can be inserted into the housing (24), The accommodation part (24) has a support part (26), and the support part (26) has a base disk (18) of the light source (16).
Abuts in the direction of the longitudinal axis (17) of the light source (16), and is further mounted on the reflector (10) so as to be rotatable between an unlocked position and a locked position. A light source (16) can be inserted into the housing portion (24) with the locking device (50) disposed in the unlocking position, and the locking device (50) is locked. By pivoting into position, the light source (16) is applied to the support (26) by a plurality of spring arms (42) distributed and acting on the base of the light source (16) over the entire circumference of the base. In the type which is held in a state and is fixed to the reflector (10), the spring arm (42) is provided with the reflector (10) and the locking device (5).
0), and is formed on a separate, non-rotatable retaining ring (40) which is fixed in position between it and the locking device (50).
An additional portion (58) surrounding the spring arm (42)
Inside the attachment portion (58), a plurality of ascending radially inward in the locking direction corresponding to the number of spring arms (42) provided on the retaining ring (40). A projection (60) is formed, provided that the spring arm (42) provided on the retaining ring (40) has a radius with respect to the longitudinal axis (17) of the light source (16) in the unlocked position of the locking device (50). In the direction, the light source (1
6) the base disc (18) is arranged to pass through between these spring arms (42);
When the lock device (50) is rotated to the lock position,
The projections (60) ride on these spring arms (42) and move the spring arms (42) radially inward so that the spring arms (42) cover the base disc (18). A fixing system for a light source mounted on a reflector of a headlight, characterized in that it is adapted to engage. 2. The fixing system according to claim 1, wherein the retaining ring (40) is fixed between a reflector (10) and a locking device (50) mounted on the reflector (10). . 3. The fixing system according to claim 1, wherein the locking device (50) is pivotally mounted on the reflector (10) by at least one screw (54). 4. The light source (1) of said spring arm (42).
6) the end area acting on the base disc (18) is such that the spring arm (42) moves radially inwardly with respect to the base disc (18) during the movement created by the projection (60). 4. The fastening system according to claim 1, comprising a side edge (43) inclined to apply a force towards the support (26). 5. 5. The locking device (50) has a spring-elastic locking element (62), which is in the unlocked position and / or in the locking position of the locking device (50). Locked in position on the reflector (10) to prevent the rotation of the locking device (50) and the locking of the locking element (62) by the locking device (5).
5. The fixing system according to claim 1, wherein the locking system is releasable with a correspondingly high torque in order to pivot 0). 6. The retaining ring (40) is provided with at least one spring-elastic locking arm (45) in addition to the spring arm (42), and the locking device (50) locks. With the light source (1
When 6) is inserted into the receiving part (24), the locking arm (45) can be pivoted outward by the base (20) of the light source (16), and the base disc ( The locking arm (45) is preloaded and acts on the base (20) in a state in which the holding member (18) is in contact with the support portion (26), and acts on the base (20).
The fixation system according to any one of claims 1 to 5, wherein the fixation system prevents falling off. 7. The device according to claim 1, wherein the retaining ring (40) consists of a sheet, and the spring arm (42) and possibly the locking arm project from the sheet by bending. The fixing system according to any one of claims 1 to 6. 8. The fastening system according to claim 1, wherein the locking device (50) is made of plastic.