DESCRIPTION

Object of the invention

This invention relates to a clip for fixing panels, and more specifically for the fixing of a primary panel that is resistant and provided with an opening or lug, with a secondary panel provided with at least an eyelet or an oblong or circular opening for the loose fitting of a shifting rod of the fixing device or lug or a screw bolt of the primary panel. The device of the invention has been especially devised to prevent the secondary panel from shifting sideways with respect to the primary panel.

This device is especially applicable to the field of the motor industry, for example to fix a primary panel of the bodywork, with secondary panels, such as inner or outer panels in plastic, fabric or other similar materials.

Background of the invention

There are different sectors, such as the motor industry, where there is frequently the need to fix secondary panels made in plastic or similar materials, to a resistant primary panel, which is generally the bodywork of the vehicle. These secondary panels, in the case of the motor industry, can be, for example, outer linings of the wheel arches or the inner lining of the doors, the dashboard or other parts of the vehicle.

In some cases these primary and secondary panels have openings to assemble fixing devices, the openings of the primary panel having suitable dimensions for the tight fitting of the fixing device, whereas the openings of the secondary panel have greater dimensions in order to facilitate the assembly operations, especially regarding its positioning facing the opening of the primary panel and the introduction through said facing openings of the fixing device, either manually or using specific. automatic tools.

In other cases, the primary pane! has lugs that pass loosely through the openings in the secondary panel, with a stop piece placed on the free end of the lug that forms, together with said lug, the fixing device of the panels.

There are currently three types of devices in use for fixing a primary panel and a secondary panel. A first type of fixing devices, used when the two panels have thoroughfare openings, includes devices comprising a plug that is introduced through the openings of the primary panels and a screw placed on said plug that determines the tightening of the panels to be joined. A second type of fixing devices, also used when the two panels have thoroughfare openings, includes the devices comprising a stop piece provided with a central opening for the assembly by pressure of a shifting rod that passes at least partially through the openings in the primary and secondary panels and has an operating head at the rear end. A third type of fixing devices, used when the primary panel has lugs intended to be mounted loosely and through the openings in the secondary panel, comprise a stop piece that is assembled by pressure on the free end of said lug and acts frontally against the secondary panel, forming the fixing device with said lug. These aforementioned devices frontally press the primary and secondary panels together, but they do not effectively prevent the secondary panel, provided with an oblong or circular opening or eyelet for the loose passage of the fixing device, from describing small sideways movements with respect to the fixing device, causing friction against the primary panel in the fixing area, which causes scratches on the metal primary panel that may facilitate oxidation or corrosion, especially when said primary panel has a protective coating of paint or the like, which is damaged or removed by the continuous friction of the secondary panel.

Therefore, the application of these fixing devices is not especially indicated for the fixing of panels in some sectors, such as in the motor industry, which offers long-term guarantees against corrosion.

The problem faced is the development of a fixing device that allows its assembly by pressure, using a pistol or specific tools, and which prevents the shifting of the secondary panel with respect to the primary panel, thus preventing scratches and the accelerated corrosion of said primary panel.

Description of the invention

The device for fastening panels is of the type comprising a stop piece provided with a central opening for the assembly of a shifting rod provided with a rear acting head on its rear end, or a fixed lug defined on the primary panel, said stop piece forming together with the shifting rod or the fixed lug a fixing device for the primary pane!, preferably in metal, with the secondary panel of plastic material or the like.

This device is also of the type in which at least one of said parts (stop piece or shifting rod), has a front surface intended to face the secondary panel and exert a certain pressure against said secondary panel, thus being fixed to the primary panel.

With these mentioned features, which are known by themselves, the device of the invention has special construction features the purpose of which are to lock the secondary panel, provided with openings for the assembly of the fixing device, to said fixing device; preventing the shifting of said secondary panel and said secondary panel from causing scratches on the primary panel, preferably, which translates into an effective reduction of the risk of damage and corrosion to the primary panel in the areas of fixing to the secondary panel.

To do this, and according to the invention, the device comprises a plurality of prongs defined or fixed, by partial fixing, for example, on the front surface of the part that is facing the secondary panel, and which protrude from said front surface; said prongs forming means intended to interlock with the material of the secondary panel during the assembly of the fixing device, and to prevent said secondary panel from moving sideways with respect to the fixing device. The interlocking of said prongs in the secondary panel determines that the secondary panel is prevented from moving sideways with respect to the fixing device, therefore preventing the secondary panel from moving sideways with respect to the primary panel and from causing scratches on it.

In a first embodiment of the invention, the prongs are fixed in a peripheral area of the front surface of the stop piece; said stop piece having on its front surface longitudinal holding legs, arranged about the central opening, and intended to be introduced into openings or eyelets defined both on the primary panel and on the secondary panel; said legs have an outer rib to keep them in the assembly position. In this first embodiment the shifting rod is assembled by the rear area with the possibility of longitudinal shifting in the central opening of the stop piece, causing the lateral expansion or opening of the longitudinal legs of the stop piece when advanced and therefore the fixing of the primary and secondary panels.

In a second embodiment the prongs are fixed onto the front surface of the rear head of the shifting rod, said shifting rod being mounted by the rear area on the opening of the stop piece provided with the longitudinal legs mentioned in the previous embodiment.

In this second embodiment the rear head of the rod has a greater front surface than the stop piece, the prongs being arranged in the peripheral area of the front surface of the rear head that protrudes from the front projection of the stop piece. Additionally, said front surface of the rear head of the rod has a central recess to house the stop piece, such that in the working position when assembled the portion of the front surface of the rear head, which carries the prongs, comes into direct and frontal contact with the secondary panel, into which the prongs are embedded.

In a third embodiment the prongs are arranged on the front surface of a stop piece which, in contrast to the ones above, does not have front legs but has the central opening to receive, in this case, a fixed lug that is integral to the primary panel and which loosely passes through the opening of the secondary panel. in this embodiment the lug of the primary panel has on its front end front coupling means in the central opening of the stop piece.

In a fourth embodiment the rod, intended to be mounted through the openings of the primary panel and the secondary panel, has an outer threading for coupling in the opening of the stop piece carrying the prongs, and a rear head that acts frontaily against said primary panel; the rod together with the rear head being configured as a screw bolt.

In any of the previous cases, and as mentioned above, the essential feature of the device of the invention consists in the existence and arrangement of said prongs, on the front surface of the parts making up the device and specifically on a front surface that in its working position is intended to be in contact with the secondary panel such that the prongs are embedded into the material of said secondary panel, preventing it from moving sideways with respect to the fixing device and the primary panel. The arrangement of the prongs described above, which are preferably made in metal, requires the use of means so that said prongs become embedded or interlocked inside the stop piece or the shifting rod, depending on the case; which complicates its manufacture.

!n order to simplify the manufacture of the device without this affecting its efficacy, we contemplate a fifth embodiment of the invention wherein the prongs that hold the primary and secondary panels together are formed from retaining elements shaped as sharp appendices or teeth that are made in the same material and using the same process as for the manufacture of the front surface of the stop piece or on the front surface of the rear head of the shifting rod, either in meta! or in plastic material. The savings in time and cost is important, since the sharp prongs are formed in the same manufacturing process of said bodies.

As in the previous cases, the sharp prongs are evenly or randomly distributed over the surface that will be in contact with the panels, thus ensuring perfect interlocking between them. These sharp prongs can be shaped as a cone, a truncated cone, a pyramid or any fancy shape, including cylindrical, with a sharp tip and that allows to be driven into the primary and secondary panels and therefore make them interlock, preventing the relative movement between them that damages the panels. Description of the drawings

In order to complement the description that is being made and with the object of aiding towards a better understanding of the features of the invention, attached to the present specification is a set of drawings in which the following has been represented with an illustrative and non-limiting nature: -~ Figure 1 shows an elevation view of an embodiment of the device in a non- operative position with the prongs fixed on the front surface of the stop piece.

Figure 2 shows an elevation view of the device of Figure 1 disassembled and showing a vertical cross-section of the stop piece.

Figure 3 shows an elevation view of the device of the previous figures with the shifting rod in a non-operative position, expanding the front legs of the stop piece sideways.

Figure 4 shows an elevation view of the device of the previous figures in a working position, fixing a metallic primary panel with a secondary panel in plastic and with the prongs embedded into the secondary panel. - Figure 5 shows an elevation view of a variant embodiment of the device of the previous figures, wherein the prongs are arranged on the front surface of the rear head of the shifting rod.

Figure 6 shows an elevation view of the device of Figure 5 in a working position, fixing a metallic primary panel with a secondary panel in plastic and with the prongs embedded into the secondary panel. - Figure 7 shows an eievation view of a variant embodiment of the device unassembled and wherein the prongs are fixed on the front surface of a stop piece intended to be fixed onto a fixed lug of the primary panel, which passes loosely through the opening in the secondary panel. - Figure 8 shows a partially sectioned elevation view of a variant embodiment of the device, where the rod has an outer threading for its coupling with the stop piece, said rod having a rear head taking being configured as a screw bolt.

Figure 9 shows an elevation view of a fifth embodiment of the fixing device for panels of the invention, wherein the prongs are sharp.

Figure 10 shows a plan view of the device shown in the previous figure.

Preferred embodiment of the invention

In the embodiment shown in figures 1 to 4, the fixing device comprises a stop piece (1) with a central opening (11 ) for the assembly of a shifting rod (2). In this embodiment of the primary panel (4), made in metal, is provided with an opening (41) for the tight assembly of the fixing device, and the secondary panel

(3) is provided with an eyelet or opening (31 ), oblong or circular in shape, for the loose assembly of said fixing device. The stop piece (1) has a front surface (10) intended to be faced with a secondary panel (3) and longitudinal legs (12) that are arranged about a central opening (11), provided with an outer retaining rib (13), intended to be introduced through the openings (31 , 41) of the secondary (3) and primary (4) panels.

The fixing device comprises prongs (5), in this case made in metal, that are partially embedded in said front surface (10) and protrude from it, forming means intended to be embedded in the material of the secondary panel (3), preventing the sideways movement of said secondary panel (3) with respect to the fixing device.

As can be observed in Figure 4, the movement of the shifting rod (2) towards the front area, introduced through the rear area of the central opening (1 1) of the stop piece (1), simultaneously causes the prongs (5) to be driven into the secondary panel (3) and the sideways expansion of the longitudinal legs (12) previously introduced into the openings (31 , 41) of the secondary (3) and primary

(4) panels; the device thus guarantees the fixing of both panels (3, 4) and the sideways immobilisation of the secondary panel (3) due to the action of the prongs

(5). In the variant embodiment shown in figures 5 and 6, the primary (4) and secondary (3) panels have openings (31 , 41) similar to those of the previous embodiment in order to assemble the fixing device.

In this variant embodiment, the prongs (5) are partially embedded in a peripheral area of a front surface (20) of a rear head (21) of the shifting rod (2).

Said front surface (20) has a greater surface than the front protrusion of the stop piece (1) and has a central recess (22) to house the stop piece (1) in the working assembled position of the device, shown in Figure 6,

In this working position the peripheral area of the front surface (20) comes into front contact with the secondary panel (3), into which the prongs are embedded (5); said secondary panel (3) being prevented from moving sideways.

Figure 7 shows a variant embodiment of the device applicable when the primary panel (4) has, instead of the opening (41), a protruding fixed lug (42) for its loose assembly through the opening (31) of the secondary pane! (3). In this variant embodiment the stop piece (1) lacks front legs and has, as in the previous embodiments, a central opening (11) for its coupling and fixing on the free end of the fixed lug (42), integral to the primary pane! (4); the prongs (5) being fixed onto a peripheral area of the front surface (10), intended to act against the secondary panel (3) of plastic material, where said prongs (5) are embedded, thus preventing the sideways movement of said secondary panel (3).

As it can be seen in said Figure 7, the fixed lug (42) of the primary panel (4) has on its front end some front coupling means (43) on the central opening (11) of the stop piece (1).

In the embodiment shown in Figure 8 the shifting rod (2), intended to be assembled through the openings (41 , 31) of the primary (4) and secondary (3) panels has an outer threading for its coupling in the centra! opening (11) of the stop piece (1) carrying the prongs (5) and a rear head (21) that acts frontally against said primary pane! (4); the shifting rod (2) together with the rear head (21) being configured as a screw bolt. Figures 9 and 10 show respective elevation and plan views of a fifth embodiment of the fixing device for panels.

These figures show the embodiment including prongs (5) formed from sharp retaining elements on the front surface (10) of the stop piece (1), but we must indicate that these same sharp prongs (5) can be included into the front surface (20) of the rear head (21) of the shifting rod (2), as shown in figures 5 and

6. As it can be seen in figures 9 and 10, the device is formed by means of a stop piece (1) having a centra! opening (11) for the assembly of the shifting rod (2) joined to the rear head (21) on which pressure is exerted when embedded.

The stop piece (1) has longitudinal legs (12) that expand when the shifting rod (2) is introduced, fixing it when embedded.

The advantage provided by this fifth variant embodiment is based on performing on the very stop piece (1) of the prongs (5) that are formed as sharp embedding elements, made in the same material as the stop piece (1).

Figures 9 and 10 show the uniform distribution of these sharp prongs (5) on the surface of the stop piece (1), distributed along an imaginary circumference that passes through their geometric centre, but which could also be distributed non-uniformly or even at different distances from the geometric centre of the relevant body.

These sharp prongs (5) can be of any shape, such as for example from the pyramidal shape shown in figures 9 and 10 to conical, frusto-conical, cylindrical shapes, etc., without disregarding any suitable shape that facilitates embedding between the primary (4) and secondary (3) panels to be joined together.

Having sufficiently described the nature of the invention, as well as a preferred embodiment thereof, we now state that the materials, shape, size and arrangement of the elements described can be modified, as long as this does not involve the modification of the essential features of the invention claimed below.