System for premounting a device on a structural element of a motor vehicle

Abstract

The invention relates to a premounting system (100) suitable for fastening a device to a structural element of a motor vehicle, the device comprising a chassis part which has at least one opening and a fastening screw which is inserted through the opening, the premounting system comprising: - a fastening means (110) suitable for being fastened to the chassis part; and - a holding means (120) designed to hold the fastening screw along a main axis (A1) and in a premounting position through the opening. According to the invention, this system further comprises an elastically deformable portion (130) designed to hold the holding means in a position in which it is distanced from the chassis part along the main axis and designed to automatically collapse in order to bring the holding means into a position closer to the chassis part along the main axis to allow the fastening screw to be screwed to the structural element.

Description

System for pre-assembling equipment on a structural element of a motor vehicle Technical field of the invention

[0001] The present invention relates generally to the attachment of equipment in motor vehicles.

[0002] It relates more particularly to a pre-assembly system adapted to facilitate the fixing of equipment on a structural element of a motor vehicle.

[0003] The invention finds a particularly advantageous application in the fixing of a head-up display on the dashboard of a motor vehicle.

[0004] It also concerns a head-up display equipped with such a pre-assembly system. State of the art

[0005] In order to make driving a motor vehicle easier and safer, we want to prevent the driver from having to look away from the road he is traveling when he wants to look at the dashboard, for example to see the speed he is traveling at or the direction he must take to reach his destination.

[0006] For this, it is known to use a head-up display, adapted to display or project information (vehicle speed, direction to follow, etc.) at the driver's eye level when the latter is observing the road.

[0007] Such a display comprises either a conventional display screen, but positioned near the windshield, or an image-forming device coupled with an image-returning system which makes it possible to reflect the light beam emitted by the image-forming device towards a partially reflective plate (commonly called a "combiner") located in the driver's field of vision (or directly towards the windshield).

[0008] Such a display in all cases comprises a chassis which is designed to be fitted into the passenger compartment of the vehicle, more precisely on or in the dashboard of the vehicle, i.e. under the windscreen.

[0009] Given this difficult-to-access position, it is understandable that fitting the chassis into the dashboard can be laborious.

[0010] Document DE102018114903 discloses a head-up display which comprises a chassis equipped with two wings, each having two openings for the passage of fixing screws. Each wing comprises, under each of its openings, a pre-assembly system. Each pre-assembly system comprises a clipping means for fixing under the wing and a screw well which is placed under the opening. This screw well makes it possible to pre-screw the fixing screw in order to keep it in a high position (not yet screwed into the dashboard).

[0011] This pre-assembly system thus allows the fixing screws to be held in positions such that once the display is properly adjusted in relation to the dashboard, these screws are well centered and held above threaded bores provided in the dashboard. The screwing operation is then made easier since it does not require positioning the screws and holding them by hand while screwing them.

[0012] It is understood that the screw can only be held if the height of the well is sufficient for the screw thread to bite into it over a satisfactory length.

[0013] The major disadvantage of this pre-assembly system is that it requires significant height.

[0014] In practice, it protrudes below the support surface of the wings on the vehicle's dashboard, which complicates the installation of the head-up display on this dashboard. Presentation of the invention

[0015] In order to overcome the aforementioned drawback of the state of the art, the present invention proposes a less troublesome pre-assembly system.

[0016] More particularly, the invention proposes a pre-assembly system adapted to facilitate the fixing of equipment (typically the head-up display) on a structural element of a motor vehicle (typically the dashboard), this equipment comprising a chassis part which has at least one opening and a fixing screw engaged through said opening.

[0017] According to the invention, the pre-assembly system comprises:- a fixing means adapted to be fixed to said chassis part,

[0018] - a holding means adapted to hold the fixing screw along a main axis and in a pre-assembly position through the opening, and

[0019] - a deformable part which, at rest, is adapted to maintain the holding means in a position spaced apart from the chassis part (and therefore from the fixing means) along the main axis, and which is adapted to be compressed to bring the holding means back into a position closer to the chassis part (and therefore to the fixing means) along the main axis by screwing the fixing screw onto the structural element.

[0020] Thus, thanks to the invention, the pre-assembly system is raised relative to the chassis part as long as the fixing screw is not screwed into the structural element of the motor vehicle.

[0021] As a result, the assembly takes up less space below the chassis part. In this case, the pre-assembly system may then not protrude below this chassis part. Therefore, it does not prevent the chassis part from being placed on the structural element of the motor vehicle. In particular, it is then possible to slide the chassis part onto the structural element, which facilitates its placement relative to the structural element.

[0022] Other advantageous and non-limiting characteristics of the pre-assembly system according to the invention, taken individually or in all technically possible combinations, are the following:

[0023] - the holding means comprises a well through which the fixing screw is adapted to be screwed;- one end of the well is bordered, over at least part of its contour, by a support wall from the edge of which said at least one deformable part extends;- the well is bordered over its entire contour by the support wall;- the deformable part is elastically deformable;

[0024] - the deformable part comprises at least two arms which each comprise a first end fixed to the support wall and a free end situated at a different height from the first end along the main axis, on the well side relative to the support wall;

[0025] - each arm extends substantially radially relative to the main axis;- each arm extends substantially orthoradially relative to the main axis;- the well has a projecting inner face from which at least three ribs rise into which a thread of the fixing screw is adapted to bite;- locking means are provided adapted to lock the well in rotation relative to the chassis part;- the locking means comprise at least one rib which projects from an outer face of the well and / or from a face of the support wall;

[0026] - the fixing means and the holding means are secured to each other by an elastically deformable connecting tab which is preferably curved in a plane orthogonal to the main axis;- the locking means comprise at least one support stop against which the elastically deformable connecting tab is adapted to abut when the fixing screw is screwed in;- the fixing means is adapted to clip into an opening provided in said chassis part;- two means for holding two fixing screws are provided, which are secured together so as to be movable relative to each other in a plane orthogonal to the main axis.

[0027] The invention also provides a display for a motor vehicle, comprising a chassis part which has at least one opening, a fixing screw engaged through the opening, and a pre-assembly system as mentioned above, the fixing means of which is fixed to said chassis part.

[0028] Preferably, the chassis part comprises engagement means adapted to engage in complementary receiving means of the structural element of the motor vehicle, by a sliding movement.

[0029] Of course, the various features, variants and embodiments of the invention may be combined with each other in various combinations to the extent that they are not incompatible or mutually exclusive. Detailed description of the invention

[0030] The description which follows with reference to the appended drawings, given as non-limiting examples, will make it clear what the invention consists of and how it can be implemented.

[0031] On the attached drawings:

[0032] is a schematic perspective view of a motor vehicle equipped with a head-up display according to the invention;

[0033] is a schematic view of a part of the dashboard of the motor vehicle, above which is attached a chassis part of the head-up display equipped with two pre-assembly systems in accordance with the invention;

[0034] is a schematic perspective view of the pre-assembly system of the, seen from a first angle;

[0035] is a schematic perspective view of an alternative embodiment of the pre-assembly system of the, seen from a second angle;

[0036] is a schematic plan view of the pre-assembly system of the;

[0037] is a schematic plan view of the pre-assembly system of the, the head-up display of the and the dashboard of the;

[0038] is a schematic sectional view of two pre-assembly systems of the type shown in the, illustrated in the rest position, on which also appears a part of the head-up display of the and the dashboard of the;

[0039] is a homologous view of the, on which the pre-assembly systems are illustrated in the position of use;

[0040] is a schematic perspective view of a part of a pre-assembly system according to a second variant embodiment of the invention;

[0041] is a schematic perspective view of a part of a pre-assembly system according to a third variant embodiment of the invention;

[0042] is a schematic perspective view of a part of a pre-assembly system according to a fourth variant embodiment of the invention;

[0043] is a schematic perspective view of a part of a pre-assembly system according to a fifth variant embodiment of the invention;

[0044] is a schematic perspective view of a pre-assembly system according to a sixth variant embodiment of the invention, shown from a first angle;

[0045] is a schematic perspective view of the pre-assembly system of the, shown from a second angle.

[0046] As a preliminary point, it will be noted that the identical or similar elements of the different variant embodiments of the invention shown in the different figures will, as far as possible, be referenced by the same reference signs and will not be described each time.

[0047] In the figure, a motor vehicle 1 is shown. It could be any vehicle (car, bus, truck, etc.), but the invention is preferably applied to cars.

[0048] This motor vehicle 1 typically comprises a chassis and a bodywork which delimit a passenger compartment for the driver and for the passengers of the vehicle.

[0049] This passenger compartment is closed at the front by a windshield 3 through which the driver can observe the road. It also houses various elements, including seats and a dashboard 10 located at the front of the passenger compartment, under the windshield 3.

[0050] In practice, as shown in the section, this dashboard 10 here comprises a mechanically welded metal structure 19 covered on top by a plastic part, here an air vent duct 18.

[0051] This motor vehicle 1 also includes any equipment to be screwed into an inconvenient access area.

[0052] In the example illustrated in the figures, and preferably, it is a head-up display 20 to be screwed onto the top of the dashboard 10, near the windshield 3 (see).

[0053] In the remainder of the description, the terms "lower" (or "bottom") and "upper" (or "top") will be used in relation to this motor vehicle, the lower side of an element designating the part of this element which faces towards the floor of the vehicle and the upper side designating the part of this element which faces towards the opposite side.

[0054] As shown, the head-up display 20 is here designed to be fitted into the dashboard 10 so as to emerge from the latter near the windshield 3.

[0055] This head-up display 20 could come in different forms.

[0056] Thus, it could include one or more display screens (typically LCD) adapted to display images in the driver's field of vision when the latter is looking at the road. This display then differs from the other screens in the vehicle in that it is located above the upper face of the dashboard.

[0057] Alternatively, the head-up display 20 could comprise an image-forming device (for example an LCD screen) located under the upper surface of the dashboard, and an image-returning system (for example a set of mirrors) making it possible to return the images into the driver's field of vision when the latter is looking at the road, above the dashboard.

[0058] In all cases, this head-up display 20 has a chassis which allows it to be fixed to the dashboard (here to the mechanically welded metal structure, above the air vent duct 18).

[0059] In the example considered here, the chassis of the head-up display 20 comprises a particular part (hereinafter called “chassis part 21”) which is illustrated on the figure and which is specifically designed to allow the chassis to be fixed to the dashboard 10 of the motor vehicle 1.

[0060] This chassis part 21 here has a U shape, with two arms 23 connected by a base 24. Of course, it could have a very different shape.

[0061] It is made here from a magnesium alloy, which gives it good mechanical properties for a very low weight and which facilitates its manufacture.

[0062] This chassis part 21 comprises means of interlocking 22' and centering 26 on the dashboard 10, and means of screwing 25' to this dashboard.

[0063] As shown, the centering means 26 serve to facilitate the positioning of the chassis part 21 on the dashboard 10 so that the screwing means are correctly positioned relative to the latter. They are for example in the form of a split tab adapted to cooperate with a lug of the dashboard 10 (not visible) by straddling it.

[0064] The interlocking means 22' comprise, at the free ends of the arms 23, teeth 22 designed to engage in housings 12 formed in correspondence with the dashboard 10.

[0065] The centering means 26 and the interlocking means 22' then make it possible to pre-lock the chassis part 21 on the dashboard 10.

[0066] The screwing means 25' serve to ensure a robust fixing of these two elements. For this purpose, they comprise, in each arm 23, at least one passage opening for a fixing screw 31. In the embodiment illustrated in this figure, each arm comprises more precisely two passage openings 25 each receiving a screw 31 (see).

[0067] The assembly of the chassis part 21 with the dashboard 10 consists of sliding the chassis part 21 onto the dashboard 10, in a sliding direction illustrated by the arrow F1, then bolting the chassis part 21 onto the dashboard 10. As shown in section 1a, the welded mechanical structure 19 of the dashboard 10 comprises for this purpose four tapped bores 17 or four welded bolts. Alternatively, the screws could be self-tapping so that they can be screwed into simple bores provided in the welded mechanical structure 19.

[0068] In order for the sliding operation to take place without problems, the upper face of the dashboard 10 has two substantially flat portions on which the two arms 23 of the chassis part 21 can slide. Correspondingly, the lower face of each arm 23 must be free of any relief forming an obstacle to sliding.

[0069] Given the reduced space between the dashboard 10 and the windshield 3 of the motor vehicle 1, it is also preferable for the screws 31 to be pre-mounted on the chassis part 21 before the latter is attached to the dashboard 10. In this way, the screwing operation will be made easier.

[0070] Finally, it is also preferable to avoid the screws 31 being in contact with the chassis part 21. Indeed, since the screws 31 are made of steel, there would be a risk of galvanic corrosion if they touched the chassis part 21 made of magnesium alloy.

[0071] It is to meet these three objectives that the chassis part 21 is equipped with pre-assembly systems 100 for the screws 31.

[0072] On the, a pre-assembly system 100 is provided in each arm 23. Thus, each pre-assembly system 100 is here provided to receive two screws 31.

[0073] There is shown a bottom view of an embodiment of this pre-assembly system 100.

[0074] In Figures 4 to 8, a variant of this pre-assembly system 100 is shown in which this system is designed to receive a single screw 31.

[0075] The following figures show other variant embodiments of the pre-assembly system 100.

[0076] In all cases, this pre-assembly system 100 is formed of at least two parts, namely: - a fixing means 110 adapted to be fixed to said chassis part 21, and - one or two holding means 120 adapted to hold a fixing screw 31 along a main axis A1 and in a pre-assembly position through the opening 25.

[0077] The fixing means 110 here comprises a snap-fastening member 111 adapted to clip into an opening (not visible in the figures) provided in the chassis part 21.

[0078] The holding means 120 comprises a well 121 through which the screw 31 is adapted to be screwed. This well 121 is preferably bordered, on the side of its upper end, by a support wall, here in the form of a collar 124 adapted to come to bear against the upper face of the chassis part 21, around the passage opening of the screw 31.

[0079] Here, the well 121 and its collar 124 form an interface preventing the screw 31 from coming into contact with the chassis part 21.

[0080] It could be provided that the latching member 111 and the well 121 have fixed positions relative to each other.

[0081] However, it happens that once the latching member 111 is clipped into the opening provided in the chassis part 21 and once the latter is centered on the dashboard 10, the well 121 is not exactly in the axis of the tapped bore 17 provided to receive the screw 31. Consequently, preferably, the latching member 111 and the well 121 are connected by an elastically deformable connecting tab 140 allowing the well 121 to have sufficient freedom so that the screw 31 can be screwed into the tapped bore of the dashboard 10. The clearance offered by this elastically deformable connecting tab 140 is preferably 1.7 mm in two directions of space (here in the plane of the collar 124).

[0082] The elastically deformable connecting tab 140 is therefore shaped so that the latching member 111 and the well 121 are movable relative to each other in a plane orthogonal to the main axis A1. It is here further shaped so that the latching member 111 and the well 121 are movable relative to each other along the main axis A1, with a clearance of approximately 2.5 mm.

[0083] According to the invention, the pre-assembly system 100 then further comprises an elastically deformable part 130 which is adapted to hold the collar 124 in a position spaced apart from the chassis part 21 along the main axis A1, and to be automatically compressed to bring the collar 124 back into contact with the chassis part 21 by screwing the fixing screw 31 onto the structural element 10.

[0084] The well 121, the collar 124, the elastically deformable connecting tab 140, the latching member 111 and the elastically deformable part 130 could be in various forms.

[0085] In the embodiment illustrated in the, the well 121 has a cylindrical shape of revolution around the main axis A1.

[0086] It has a cylindrical outer face adapted to engage in the opening 25 provided correspondingly in the chassis part 21. More precisely here, it has an outer diameter slightly smaller than that of this opening (the difference here being 3.4 mm). In this way, thanks to the flexibility of the elastically deformable connecting tab 140, the position of the well can be adjusted so as to extend in the axis of the tapped bore 17 of the dashboard 10.

[0087] The well 121 is open downwards and upwards so that it can be passed through by the screw 31.

[0088] It has a cylindrical internal face of revolution, the section of which is chosen in such a way that the thread of the screw 31 does not catch on it.

[0089] In the embodiment of the, to maintain the screw 31 in the pre-assembly position, the lower end of this well 121 is partially closed by a wall pierced in its center by an orifice 127. Correspondingly, as shown for example the, the screw 31 has an end (opposite its head) smooth and without thread which is adapted to be housed in the orifice 127 in order to maintain the screw 31 there.

[0090] To allow the screw 31 to pass through the well 121 when it is screwed in, this well 121 has, over a major part of its height, three slots parallel to the main axis A1, which are regularly distributed around this axis and which open downwards. These slots thus delimit between them three well parts, which are then adapted to move away elastically from the main axis A1 when the screw is screwed into the well 121.

[0091] In the, there is shown an alternative embodiment of the pre-assembly system 100 of the, which differs in particular from the latter in that the well 121 is without a slot and a wall pierced by an orifice. In this alternative, the well 121 is completely open upwards and downwards, and it has a projecting cylindrical inner face from which rise at least three ribs 122 into which the thread of the screw 31 is adapted to bite. In other words, the thread of the screw 31 is provided to hook onto the ribs 122 only, without biting into the inner face of the well 121 (which reduces the screwing torque necessary for the installation of the screw 31). These ribs 122 extend in length parallel to the main axis A1, and they have uniform cross-sections (in a plane orthogonal to the main axis A1) of triangular shape, with the apexes facing this axis.

[0092] As shown in figure 4, the collar 124 which borders the upper end of the well 121 extends here over more than half of the contour of the well in order to form a good support for the head of the screw 31. It is however interrupted so that the elastically deformable connecting tab 140 can hang on the well 121.

[0093] Alternatively and preferably, as shown in Figures 13 and 14, the collar 124 can extend all around the well 121, so that the head of the screw 31 can rest there uniformly (which allows the stresses to be well distributed).

[0094] This collar 124 has flat upper and lower faces. As shown for example, the lower face of the collar is intended to bear against the upper face of the chassis part 121, while the upper face of the collar 124 is intended to receive the screw head 31.

[0095] As shown in, the height h2 of the well 121, measured from the lower face of the collar 124, is chosen so that, once the screw is pre-screwed into this well, it remains firmly held in position, along the main axis A1. In particular, it must be able to withstand significant forces, of the type exerted by a screwdriver.

[0096] This height h2 is here greater than the thickness of the chassis part 21. It is therefore understood that, when the collar 124 rests against the upper face of the chassis part 21, the lower end of the well 121 protrudes under this chassis part 21. In this position, the well 121 would therefore prevent the chassis part 21 from sliding on the upper face of the dashboard 10.

[0097] To avoid this, the elastically deformable portion 130 is provided to raise the well 121 into a waiting position illustrated in Figures 6 and 7, in which the lower end of the well 121 does not protrude below the frame part 21.

[0098] It should be noted here that it was chosen to raise the collar, and not to manufacture it with a greater thickness, so that once the screw is screwed into the dashboard 10, its head does not protrude or only slightly above the surface thereof. Too much protrusion would indeed be unsightly and would be a potential source of injury for a pedestrian who, struck by the car, would impact the windshield and the dashboard.

[0099] In the embodiment illustrated in and in the variant illustrated in Figures 4 to 6, the elastically deformable part 130 (which is recalled to be used to achieve this elevation) comprises several arms 131, each of which comprises a first end fixed to the well 121 and a free end located at a different height from the first end (along the main axis A1).

[0100] As clearly shown here, the elastically deformable part 130 comprises exactly three arms 131, the first ends of which are attached to the peripheral edge of the collar 124.

[0101] Here, the first end of each arm 131 is bent at a right angle to attach to the collar. In this way, the remainder of each arm 131 extends substantially orthoradially with respect to the main axis A1 (i.e. in a plane which is perpendicular to the plane containing this axis and passing through the first end of the arm).

[0102] Each arm 131 is furthermore naturally curved downwards, here in an S shape. By “naturally” we mean that at rest, when no force is exerted on the arm, the latter has this S shape. Thus, the free end of each arm 131 can rest against the upper face of the chassis part 21.

[0103] As clearly shown, when the screw 31 is finally screwed into one of the threaded bores 17 of the dashboard 10, this screw 31 descends naturally into the well 121 until it comes to cooperate with the threaded bore 17. Once its thread engages with the thread of this bore, the screw 31 continues to descend until its head comes to bear against the upper face of the collar 124 (see). During this descent, the screwing of the screw 31 makes it possible to force the arms 131 to deform into a position in which the lower face of the collar 124 comes to bear against the chassis part 21.

[0104] It is understood that during this screwing operation, the well 121 is subjected to a torque around the main axis A1. Means are then provided for locking the well 121 so that it does not rotate in the opening 25 of the chassis part 21. These means can take different forms.

[0105] In the embodiment of the and in most of the variants shown, the well 121 has projecting from its outer face an outer rib 123 which extends radially in a plane containing the main axis A1. This outer rib 123 is attached not only to the well 121 but also to the collar 124, which makes it more rigid. It is designed to fit into a notch provided in the edge of the opening 25 of the chassis part 21 and to come to bear against an edge of this notch when screwing in the screw 31. It will be noted that this notch has dimensions greater than those of the outer rib 123, so as to leave the desired clearance between the well 121 and the edge of the opening 25.

[0106] In the variant illustrated in Figures 13 and 14, the means for blocking the well 121 so that it does not rotate are in the form of a stop 128. This stop 128 is a small wall which projects above the collar 124, in a position such that, when the screw 31 is screwed in and the well 121 begins to rotate around its main axis A1, this stop 128 comes to bear against the elastically deformable connecting tab 140, which blocks the rotation of the well 121.

[0107] In Figures 3 and 4, the fixing means 110 of the pre-assembly system 100 on the chassis part 21 is shown in detail. In particular, its latching member 111 is shown in detail.

[0108] Here, this fixing means 110 comprises a support 112 formed by a square front wall bordered downwards by a stiffening side wall. The elastically deformable connecting tab(s) 140 (which connect this fixing means 110 to each well 121) are attached here to this side wall.

[0109] The latching member 111 comprises two identical latching tabs positioned back-to-back. Each tab comprises a flexible strip which rises from the lower face of the front wall of the support 112, downwards. The flexible strips extend, at rest, so as to move slightly apart from each other. Each strip comprises, at its free end, on its face facing away from the other latching tab, a hooking tooth. This member is therefore adapted to hook automatically onto the chassis part 21 when the pre-assembly part 100 is attached above the opening provided correspondingly in the chassis part 21.

[0110] It will be noted that preferably, at rest, the lower face of the side wall of the support 112 extends in a parallel plane distinct from the plane of the lower face of the collar 124. These two planes are intended to merge when the screw 31 is fully screwed into its tapped bore 17.

[0111] The elastically deformable connecting tab 140, which connects this fixing means 110 to the well 121, is formed by a strip which, at rest, is preferably curved in an S shape in a plane orthogonal to the main axis A1. This strip has a cross-section whose height (parallel to this axis) is greater than the width, which gives it the desired flexibility in the plane orthogonal to the main axis A1. In this way, it ensures that the well 121 has mobility in this plane.

[0112] In the embodiment of the, two wells 121 are therefore provided located on either side of the fixing means 110. These two wells are connected to this fixing means 110 by two separate elastically deformable connecting tabs 140, which hook on either side of the side wall of the support 112. Thus the two wells 121 are secured together so as to be movable relative to each other.

[0113] Preferably, the pre-assembly system 100 is formed in one piece by molding a plastic material such as polyamide 6 (PA6) or polyoxymethylene (POM).

[0114] The present invention is in no way limited to the embodiment described and shown in Figures 1 to 8, but those skilled in the art will be able to provide any variant in accordance with the invention.

[0115] Thus, in Figures 9 to 12, four variant embodiments of the well 121 and of the elastically deformable part 130 which makes it possible to raise the well relative to the chassis part 21 are shown.

[0116] In the variant illustrated in the, the well 121 is devoid of a collar and its three arms 131A extend directly from the outer face of the well 121, radially relative to the main axis A1. These arms 131A are inclined downwards, at the same angle of between 5 and 45 degrees.

[0117] Here, the arms 131A are formed by the same conical part which is cut into three arms by two slots and by a cutout for the passage of the elastically deformable connecting tab 140. Each arm 131A therefore has an increasing width from its end attached to the well 121 towards its free end.

[0118] In the variant illustrated in the, the well 121 does indeed carry a collar 124 and the three arms 131B extend radially from this collar 124. This variant is distinguished mainly from the previous one in that each arm 131B has a constant width from its end attached to the collar 124 towards its free end. These three arms therefore each extend in a plane inclined downwards relative to the plane of the collar 124.

[0119] The variant illustrated on the figure differs from the previous one in that the well 121 is devoid of a collar and that each arm 131C has a first part which is directly attached to the well 121 and which extends in a plane orthogonal to the main axis A1, which first part is extended by a second part inclined downwards.

[0120] In the variant illustrated in the, more than three arms 131D are provided. Here, eight are provided, which extend substantially orthoradially with respect to the main axis A1. These arms are identical. They are attached to the collar 124 by a first end curved at a right angle. The major part of each arm extends, at rest, in a plane orthogonal to the main axis A1. But the free end of each arm has, on its lower face, a lug whose end extends under the lower face of the collar.

[0121] Other variants of the invention not illustrated in the figures could be envisaged.

[0122] For example, the pre-mounting system could be used to attach equipment other than a head-up display, such as a mobile phone support arm.

Claims

A pre-mounting system (100) adapted for pre-mounting a fixing screw (31) through an opening (25) provided in a chassis part (21) of equipment (20) to be fixed to a structural element (10) of a motor vehicle (1), the pre-mounting system (100) comprising: - a fixing means (110) adapted for fixing to said chassis part (21), and - a retaining means (120) adapted for retaining the fixing screw (31) along a principal axis (A1) and in a pre-mounting position through the opening (25), characterized in that it further comprises a deformable portion (130) which, at rest, is adapted to hold the retaining means (120) in a position offset from the chassis part (21) along the principal axis (A1), and which is adapted to compress to return the retaining means (120) to a position closer to the chassis part (21) along the main axis (A1) by means of screwing the fixing screw (31) onto the structural element (10). Pre-assembly system (100) according to claim 1, in which the retaining means (120) has a well (121) through which the fixing screw (31) is adapted to be screwed. Pre-assembly system (100) according to claim 2, in which one end of the well (121) is bordered, on at least part of its contour, by a support wall (124) from the edge of which extends said at least one deformable part (130). Pre-assembly system (100) according to claim 3, in which the well (121) is bordered on its entire contour by the support wall (124). Pre-assembly system (100) according to any one of claims 3 and 4, wherein the deformable part (130) comprises at least two arms (131) each having a first end fixed to the support wall (124) and a free end located at a different height from the first end along the main axis (A1), on the side of the well (121) relative to the support wall (124). Pre-assembly system (100) according to claim 5, in which each arm (131) extends substantially radially with respect to the main axis (A1). Pre-assembly system (100) according to claim 5, wherein each arm extends substantially orthoradially with respect to the main axis (A1). Pre-assembly system (100) according to any one of claims 2 to 7, in which the well (121) has a projecting inner face from which rise at least three ribs (122) in which a thread of the fixing screw (31) is adapted to bite. Pre-assembly system (100) according to any one of claims 2 to 8, wherein locking means are provided adapted to lock the well (121) in rotation relative to the chassis part (21). Pre-assembly system (100) according to claim 9, wherein the locking means comprise at least one rib (123) which extends projecting from an outer face of the well (121). Pre-assembly system (100) according to any one of claims 1 to 10, wherein the fixing means (110) and the holding means (120) are joined together by an elastically deformable connecting tab (140), which is preferably curved in a plane orthogonal to the main axis (A1). Pre-assembly system (100) according to claims 9 and 11, wherein the locking means comprise at least one support stop (128) against which the elastically deformable connecting tab (140) is adapted to butt when screwing the fixing screw (31). Pre-assembly system (100) according to any one of claims 1 to 12, wherein the fastening means (110) is adapted to clip into an opening provided in said chassis part (21). Pre-assembly system (100) according to any one of claims 1 to 13, in which two means for retaining (120) two fixing screws (31) are provided, which are joined together so as to be movable relative to each other in a plane orthogonal to the main axis (A1). Head-up display (20) for motor vehicle (1), comprising a chassis part (21) which has at least one opening (25) and a fixing screw (31) engaged through the opening (25) and adapted to be screwed into a structural element (10) of the motor vehicle (1), characterized in that it further comprises a pre-mounting system according to any one of claims 1 to 14, the fixing means of which (110) is fixed to said chassis part (21). Head-up display according to claim 15, in which the chassis part (21) has interlocking means (22() adapted to engage in complementary receiving means (12) of the structural element (10) of the motor vehicle (1), by a sliding movement. Motor vehicle (1) comprising a windscreen (3) and a structural element (10) located under the windscreen (3), characterized in that it further comprises a head-up display (20) conforming to one of claims 15 and 16, of which said fixing screw (31) is screwed into said structural element (10).

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