DEVICE FOR FIXING COURTESY MIRRORS OF SUN VISORS

Abstract: The fixing device is comprised of a plurality of fixing protuberances (1) and respective retention means (MR). The fixing protuberances (1) have essentially a cylindrical shape and project from the bottom of the cavity (2) which configures the single-piece envelope (3) which is obtained by blow-forming of plastic materials, of the sun-visor, which cavity (2) receives the tray (4) of the courtesy or passenger mirror so that the fixing protuberances (1) penetrate the tray (4) through respective traversing holes (7). The tray (4) remains firmly secured in the cavity (2) by the retention means ( MR ) comprised of a plastic deformation (10) of the free end of the fixing protuberance (1), or by a self-threading screw (11) or by an internally serrated washer (12) or by a self-threading nut (14) which, in any case, press the tray (4) to the bottom of the cavity (2). Application to the car industry.

Description: Field of the Invention The object of the present invention is an attachment device for automobile sunvisor vanity mirrors which, in particular, is applicable to sunvisors structured on a one-piece plastics material casing. Background of the Invention It is well known that automobile sunvisors are provided as original equipment with a mirror which is usually known as a vanity mirror. The vanity mirror may be simply superimposed on said sunvisor or it may be integrated in the sunvisor structure. The vanity mirrors integrated in the sun visor structure comprise in general essentially a boxlike shell and a cover plate. The boxlike shell of the vanity mirror is basically prismatic in shape and is open on the front surface thereof, the said boxlike shell being dimensioned to contain the mirrored surface as such as well as other devices related with the functionality of the vanity mirror. The vanity mirror cover plate is attached to the said boxlike shell and may be operated at will by the user so that the latter may conceal the mirrored surface or open it to view. In the vanity mirrors based on a one-piece plastics material casing produced by blow moulding such materials, the boxlike shell of the vanity mirror is housed in a cavity formed for that purpose in the corresponding side of the sunvisor. The vanity mirror boxlike shell is usually attached to the cavity of the sunvisor casing by adhesives. In certain cases, adhesive products applied on the corresponding facing surfaces are used. In other cases, attachment is achieved by way of one or more portions of flexible tape, both surfaces of which are provided with adhesive products, such that the respective surfaces of the flexible tape portions are attached to the vanity mirror boxlike shell and the opposite sides of said portions are attached to the cavity of the sunvisor casing. In any case, the attachment of the vanity mirror boxlike shell to the said sunvisor casing cavity by adhesive products, as described above, generally has certain drawbacks. On the one hand, the vibrations caused when the vehicle is running frequently cause a precarious attachment or even untimely detachment of the vanity mirror and, on the other hand, the high temperatures which the sunvisors usually reach, from sun radiation among other causes, affect the adhesive products and diminish their adhesive properties, all of which leads, similarly to what was described above, to a weak attachment of the vanity mirror boxlike shell in the sunvisor casing cavity and detachment thereof. Among various documents in which are described posts or extensions or domes somewhat similar to the cylindrical attachment projections of the present invention, it is underlined the prior documents EP-A-0 403 846, US-A-4 213 169 and US-A-4 494 789. However, the technology used in their manufacture differs from the plastic blow moulding techniques of the present invention and the means used in these prior devices in order to attach the vanity mirror boxlike shell to the sunvisor casing cavity are more complex than those of the device of this invention. It may be gathered from the foregoing that the described means used for attaching the vanity mirror to the sun visor are of reduced operative reliability which, under certain conditions, may cause dangerous situations and/or accidents and, furthermore, a high financial cost making the end product expensive. Summary of the Invention To provide a solution which is cheap and highly operatively reliable in comparison with the known embodiments of attachment means for sunvisor vanity mirrors based on a one-piece casing produced by blow moulding of plastics materials, there is disclosed a new attachment device for sunvisor vanity mirrors. The attachment device of the invention is of the kind in which the cavity formed in the one-piece casing of the sunvisors for housing the vanity mirror is provided with a plurality of essentially cylindrical attachment projections which are uniformly spaced apart and project to a relatively small extent perpendicularly from the bottom wall of said cavity. Said attachment projections penetrate in the interior of the vanity mirror boxlike shell by way of through holes provided at positions positionally mating with said attachment projections on the rear surface or bottom wall of the boxlike shell, the boxlike shell being firmly attached in the cavity of the sunvisor one-piece casing by the locking effect of retaining means on each of the attachment projections. The invention relates to an attachment device of the kind disclosed in any of the prior art documents cited above and is characterised in that the cylindrical attachment projections are manufactured forming a single piece with the sun visor casing by a sole operation of plastic blow moulding, and in that the retaining means for the attachment device of the invention is constituted by plastic deformation of the free end of the attachment projection, said deformation being caused by ultrasonic techniques, by heat or by mechanical impact so that the boxlike shell is compressed between the deformed free end of the attachment projection and the bottom wall of the one-piece casing cavity. The features of the attachment device of the invention described above provide a solution to the problems presented by the known embodiments of means for attaching the vanity mirror to the sunvisor using adhesive products. In this respect, the fact that the attachment projections of the device of the invention are produced during the casing blow moulding operation and the fact that the retaining means holding the boxlike shell of the mirror to the casing may be formed or coupled to the attachment projections in the most appropriate stage of the production process, reduces the production costs of the sunvisor and, in particular, reduces the costs associated with the assembly of the boxlike shell in the corresponding cavity of the casing relative to the known attachment means based on the use of adhesive products in which the latter have to be applied using specific processes in different stages of the sunvisor assembly process. On the other hand, the operative reliability of the attachment device of the invention is, of its very essence, superior to the reliability obtained with the known attachment means based on the use of adhesive products. Brief Description of the Drawings The attachment device for sunvisor vanity mirrors of the invention is shown in the sheets of drawings accompanying the present specification. In the drawings: Figure 1 is a perspective view showing one stage of the attachment of the vanity mirror boxlike shell to the sunvisor one-piece casing. Figure 2 is a perspective view of the attachment projections of the device of the invention. Figure 3 is a cross-section view showing the attachment projections of the device of the invention. Figure 4 is a cross-section view showing the vanity mirror boxlike shell and the sunvisor casing attached together. Figures 5 is a cross-section view showing the retaining means of the device of the invention. Detailed Description of the Embodiment The attachment device for sunvisor vanity mirrors of the invention described as an embodiment comprises, as shown in Figures 1 and 2 of the drawing sheets, the retaining projections 1 formed in the cavity 2 of the sunvisor casing 3 and any of the retaining means MR shown in Figure 5. Figure 1 shows how the sunvisor casing 3 is an essentially prismatic one-piece unit, the contour of which, given just as a guidance, corresponds with the configuration of the automobile passenger compartment. The casing 3 is made from plastics materials, such as polythene or polypropylene and is blow moulded from these materials. The casing 3 is known to be provided, for the purpose of increasing the mechanical strength thereof, with a filling which may be formed by polythene, polypropylene or P.U.R. which, for the purposes of clarity of description, has not been shown in the Figures. Figure 1 shows how the casing 3 is formed, on one of the surfaces thereof, with the cavity 2 for snugly receiving the boxlike shell 4 of the vanity mirror, which, for the same reasons as given above, has not been fully shown in the Figures. In this embodiment, the vanity mirror boxlike shell 4 and the cavity 2 of the sunvisor casing 3, both shown in Figure 1, are basically prismatic in shape and are mutually complementary for snug fitting together although, obviously, they may have any other configuration appropriate for each particular application, without this affecting the functionality of the attachment device of the invention. Figures 1 and 2 show how the cavity 2 of the casing 3 is provided with the attachment projections 1 which are essentially cylindrical and the free end thereof has a convex finish. In this embodiment of the attachment device of the invention, there are two attachment projections 1, mounted on the main longitudinal axis of the cavity 2 at a relatively short distance from the transverse walls 5. Obviously, the number and distribution of the attachment projections 1 will depend on the needs and, in particular, on the size of the vanity mirror in each particular application, whereby the situation and number of the attachment projections 1 contemplated in this embodiment are given purely as an orientative example. Figure 1 shows how the surface 6, or bottom wall, of the vanity mirror boxlike shell 4 is provided with the through holes 7 which correspond functionally in number and position with the attachment projections 1 of the cavity 2 of the casing 3. In this embodiment, the through holes 7 are formed at the inner end thereof with respective mouths 8 consisting of an annular coaxial hollowing out merging into the through hole 7, defining an intermediate step. Figure 5 shows an embodiment of the retaining means MR which is formed, preferably by ultrasonic techniques, on the attachment projection 1 so that it defines thereon the shank 9 and the seating head 10, the perimetral edge of which seats on the mouth 8 of the through hole 7 of the vanity mirror boxlike shell 4. The vanity mirror boxlike shell 4 is mounted to the sunvisor casing 3 by means of the sunvisor vanity mirror attachment device as follows: after the vanity mirror boxlike shell 4 has been attached to the cavity 2 in the sunvisor casing 3 with the through holes 7 and the attachment projections 1, using the retaining means MR shown in Figure 5, the seating head 10 which, as said above is partially housed in the mouth 8 of the through hole 7, is shaped with ultrasonic techniques, by heat or by mechanical impact, so that it presses the boxlike shell 4 against the bottom wall of the cavity 2 of the casing 3. In this way, the attachment device of the invention fixedly locks the position occupied by the vanity mirror boxlike shell 4 in the cavity 2 of the sunvisor casing 3, without having to have recourse to adhesive products, as happens with the known embodiments of fixing means for vanity mirrors in sunvisors, thereby avoiding the previously described problems derived from the use of such products.

Claims: An attachment device for sunvisor vanity mirrors for attaching the vanity mirror to the sunvisor casing, of the kind of having a plurality of essentially cylindrical attachment projections (1) which are forming a single piece with the sunvisor casing (3) and which, uniformly spaced apart, project to a relatively small extent, perpendicularly from the bottom wall of said cavity (2), said attachment projections (1) penetrating in the interior of the vanity mirror boxlike shell (4) by way of through holes (7) provided positionally mating with said attachment projections (1) on the rear surface or bottom wall (8) of the boxlike shell (4), the boxlike shell (4) being firmly attached in the cavity (2) of the sunvisor one-piece casing (3) by the locking effect of retaining means ( MR ) on each of the attachment projections (1), characterized in that the cylindrical attachment projections (1) are manufactured forming a single piece with the sunvisor casing (3) by a sole operation of plastic blow moulding, and in that the retaining means ( MR ) is constituted by plastic deformation (10) of the free end of the attachment projection (1), said deformation (10) being caused by ultrasonic techniques, by heat or by mechanical impact so that the boxlike shell (4) is compressed between the deformed free end (10) of the attachment projection (1) and the bottom wall of the one-piece casing (3) cavity (2).

Inventors: AYMERIC MUNOZ JOSE, PRAT CASTAN JESUS, AYMERIC MUNOZ, JOSE, PRAT CASTAN, JESUS, AYMERIC MUNOZ, José, PRAT CASTAN, Jesús
Applicants: FICO ITM SA, FICO I.T.M., S.A.
Application year: 1992
Main classification: B60J3
IPC codes: B60J3