SEMI-AUTOMATIC OPENING AND CLOSING DEVICE FOR SUN VISOR MIRRORS PROVIDED WITH A HINGED COVER

Abstract: The disclosed device is comprised of two identical fixing springs R which are arranged inside the tray (1) of the mirror E symmetrically at both shorter sides and at a reduced distance from the rotation axis G of the cover (2), both springs R being hooked to the tray (1) and to the cover (2) of the mirror E through corresponding holes consitutive of retention means MR . The fixing springs R operate permanently in a torsion mode and in such a way that, from an intermediate position of the rotational travel of the cover (2), two directions of automatic rotation of the cover (2) are determined, which are the opening direction and the concealing direction of the specular surface SE . Application to the car industry.

Description: Field of the Invention The object of the present invention is a semiautomatic opening and closing device for sunvisor mirrors having a fold-down cover which, in particular, is applicable to automobile sunvisor mirrors of modular structure. Background of the Invention It is well known that in automobiles, the passenger side sunvisor is provided as original equipment with a mirror, generally known as a vanity mirror, which, when said sunvisor is of modular construction, usually basically comprises an essentially prismatic casing and a cover which may be opened and closed at will by the user. The mirror casing is dimensioned to contain the mirror surface as such and the means and/or devices intended for increasing the functionality of the mirror, such as may be, among other regularly used ones, means for illuminating the immediate surroundings of said mirror. The purpose of the cover is to conceal the mirror surface housed in the casing to conserve its reflective properties by preventing deterioration thereof by action of the environment. Where the cover is attached to the prismatic casing of the mirror in such a way that said cover may be pivoted, the mirror requires means and/or devices holding the cover in the positions in which the mirror surface is concealed and/or open to view. As examples of sunvisor vanity mirror embodiments having a hingedly attached cover, there may be cited Spanish utility models n º s 276 352 for "Parasol perfeccionado para vehículos automóviles" and 276 353 for "Parasol mejorado para vehículos automóviles". Both said utility models, further to the novel features characterizing them, are differentiated by the respective means used for holding the cover in the concealment position. Utility model 276 352 bases the holding of the cover in the concealment position on the action of a mechanical pressure closing means, while utility model 276 353 bases said holding on a magnetic closing means. In general, the known embodiments of Vanity mirrors having a hingeable cover suffer, among others, from the following drawbacks: the means holding the cover in the concealment and/or open to view positions of the mirror surface comprise a high number of expensive to make and assemble components, which consequently makes the end product more expensive; the said holding means are of limited reliability as far as retaining the cover in the said positions is concerned, being a frequent cause of untimely detachment of the cover; and the manual operation of the said means also relatively frequently involves a deformation and/or breakage of the mirror components. The precharacterising portion of claim 1 starts from the nearest prior art document, namely French patent application no. FR-A-2 318 045 relating to a sunvisor for vehicles comprising a cavity accommodating a so-called vanity mirror. The mirror is equipped with a fold-down cover 22 mounted by hinges on the upper edge of the mirror frame. Two extensions 74 are directly formed on either side of the cover in the vicinity of the axis of rotation, said extensions having in a direction rectangular to said axis an elongated shape and providing a means for retaning one end of a tension spring at the distance from the axis of rotation of the cover (see figures 3 and 4). The other end of the tension spring is retained by a retaining bracket formed on the inner front side of the mirror frame 10 at an intermediate position substantially half-way between the upper and lower edge of said frame. In a position where the cover is folded down the retaining point of the tension spring in the extension 74 is located such that the resulting momentum operating on the cover via the extension around the cover's axis keeps the cover folded down against oppositely directed forces until the cover and thereby the retaining point of the tension spring have been moved around the axis of cover to a position where the momentum provided by the spring force and the leverann formed by the extension 74 effects an automatic opening movement of the cover 22. Since the upper tension spring is mounted in the interior of the mirror frame it is difficult to replace it once the mirror frame has been assembled and mounted on the sunvisor. Thus, if the tension spring proposed in this French patent application is unhooked accidently or breaks, a great effort is necessary to replace it by a new one, since the mirror frame has to be dismounted from the sunvisor and its component parts have to be disassembled. A further disadvantaguous feature of the above construction lies in the fact that to achieve the necessary momentum for the movement of the cover around the axis of rotation the two above-described elongated extensions 74 have to be established on both sides of the cover 22 and for retaining the springs the two brackets have to be formed on the interior front side of the frame. Obviously the forming of these component parts involve an increase in production costs. The main disadvantage of this mirror concerns the usage of tension springs which are generally relative long component parts and occupy together with their hooking means a lot of space in the mirror's interior that could otherwise be used for e.g. bigger lamps or other component parts. From the British pPatent Specification GB-A-892,370 the use of a toggle spring in a disadvantageously very complex hinge for automobile luggage compartments is known. It is the object of the present invention to provide a semi-automatic opening and closing device for sunvisor mirrors having a fold-down cover which overcomes the above-described disadvantages. This object is achieved by the features defined in the characterizing portion of the new claim 1. According to an embodiment of the invention, the semiautomatic opening and closing device is characterized in that the retaining means attaching the holding springs to the mirror casing and cover are formed by: two mutually opposite hooking orifices in the sides of the mirror casing transverse to the axis of rotation of the cover, at a relatively short distance from said axis of rotation, in each of which orifices there is hooked one end of the corresponding holding spring, which ends may rotate freely in their place of hooking; two mutually opposite thrust orifices in the sides of the mirror cover transverse to the axis of rotation, each of which orifices houses the other end of the corresponding holding spring, which ends may rotate freely in their housing, with the condition that the virtual longitudinal axis defined by said thrust orifices is at a greater distance from outer surface of the cover than the longitudinal axis of rotation of said cover, and with the condition that the said virtual longitudinal axis is at a smaller distance from the front edge of the cover than the longitudinal axis of rotation thereof. The small number of component parts of the semiautomatic opening and closing device for sunvisor mirrors having a fold-down cover of the invention, as well as the extraordinary simplicity of manufacture and assembly of these components are essential factors as far as production costs are, in general, concerned. Because of its characteristic structure, the device also affords high operative reliability which, under the normal conditions of use of the vanity mirror, prevent the untimely detachment of the cover in either of the two stable positions thereof, i.e. of concealment or open to view position of the mirror surface. The operation of the semiautomatic opening and closing device of the invention is extremely simple and prevents the user from subjecting the vanity mirror components, under normal conditions of use when concealing and revealing the mirror surface, to mechanical overloads which may cause a deformation and/or breakages of the said mirror components. Since the holding springs are always working under torque as described above, the device of the invention works in such a way that, when the cover is in the mirror surface concealment position, to uncover the surface the user has only to apply to the front edge of the cover a force sufficient to overcome the action of the holding springs and cause it to rotate over a relatively small distance until, on reaching a particular intermediate position, relatively close to the concealment position, the manually started rotation continues automatically under the action of the holding springs until the intended position in which the mirror surface is uncovered and may be used by the user is attained. Contrarywise, i.e. when the mirror surface is uncovered, to conceal said surface, the user, similarly to the way described above, has to apply a force to the front edge of the mirror overcoming the force of the holding springs and cause it to rotate to the said intermediate position, as from which the cover, under the action of the holding springs will automatically continue the manually started rotation until the position in which the mirror surface is concealed is attained. Brief Description of the Drawings The semiautomatic opening and closing device for sunvisor mirrors having a fold-down cover of the invention is illustrated in the sheets of drawings accompanying this description. In the drawings: Figure 1 is a front view of the sunvisor mirror having a fold-down cover. Figure 2 is a side view of the mirror illustrated in Figure 1. Figure 3 is a front view of the sunvisor mirror having a fold-down cover showing the device of the invention. Figure 4 is a front view of a holding spring of the device of the invention. Figure 5 is a side view of a holding spring of the device of the invention. Figure 6 is a part view of the mirror in cross section, showing the device of the invention, with the mirror cover in the open position. Figure 7 is a schematical view of the operation of the device of the invention of Figure 6. Figure 8 is a part view of the mirror in cross section, showing the device of the invention, with the mirror cover in an intermediate position. Figure 9 is a schematical view of the operation of the device of the invention of Figure 8. Figure 10 is a part view of the mirror in cross section, showing the device of the invention, with the mirror cover in the mirror surface concealing position. Figure 11 is a schematical view of the operation of the device of the invention of Figure 10. Detailed Description of the Embodiment The semiautomatic opening and closing device for sunvisor mirrors having a fold-down cover of the invention described as an example comprises, as shown in Figure 3 of the drawing sheet, two holding springs R attached to the casing 1 and to the cover 2 of the mirror E by the retaining means MR , both holding springs R and the retaining means MR being arranged symmetrically about the transverse axis of the mirror E . The mirror E may be integrated in a modular structure sunvisor which, for clarity of description, has not been shown in the drawing sheets. As shown in Figures 1 and 2, the casing 1 of the mirror E is essentially prismatic in shape and in this embodiment is dimensioned to house, further to the mirror surface SE , the means IE for electrically illuminating the immediate surroundings of the mirror E , said means IE being shown in Figure 3. Obviously, the mirror E casing 1 may be dimensioned to house, further to the said mirror surface ES , any other means and/or device for increasing the services or functionality of the mirror E . Figures 1 and 3 show how the casing 1 and the cover 2 of the mirror E are provided with the corresponding means enabling the cover 2 to rotate about itself on the axis of rotation shown as G in said Figures 1 and 3, as well as in Figures 6 to 11, which means, for the same reasons as given above, have not been shown in the drawings. Figure 2 shows the casing 1 of the mirror E which is formed, on the side opposite the one having the means allowing the rotation of the cover 2 with the recess 3 provided to facilitate for the user the operation of rotating the cover 2 which may thus be taken hold of with the front edge 4 thereof, so as to uncover the mirror surface SE . Figures 4 and 5 show how each of the two holding springs R is provided at the respective ends thereof with the transverse extensions 5a and 5b which, in this embodiment, are of the same length, said extensions 5a and 5b being formed at the free ends thereof with respective bent terminations 5a' and 5b' . Figure 3 and, in detail, Figures 6, 8 and 9 show how the retaining means MR attach the holding springs R to the casing 1 and to the cover 2 of the mirror E and are arranged symmetrically to the transverse axis of the mirror E , as said above, at a short distance from the axis of rotation G . The retaining means MR comprise at both said sides of the mirror E : a through hooking orifice 6 on the casing 1, in which there is snugly housed the bent termination 5b' of the transverse extension 5b of the corresponding holding spring R ; and the through thrust hole 8 on the perpendicular extension 7 formed on said cover 2 in this embodiment which snugly houses the bent termination 5a of the same holding spring R , both bent terminations 5a' and 5b' being able suitably to rotate in their respective housings defined by the through hooking orifice 6 and through thrust orifice 8 respectively. Figures 6, 8 and 10 show how, in this embodiment, the virtual longitudinal axis, marked LV1 in Figure 3, defined by the through hooking orifices 6 formed on both transverse sides of the casing 1 of the mirror E , and the longitudinal axis of rotation G are at the same distance from the upper edge 9 of said casing 1. Figure 6 shows how the virtual longitudinal axis, marked LV2 in Figure 3, defined by the through thrust orifices 8 formed on both sides of the cover 2 of the mirror E , is arranged at a greater distance from the outer surface ST of the cover 2 and at a shorter distance from the front edge 10 of the cover 2 than the longitudinal axis of rotation G . The semiautomatic opening and closing device for sunvisor mirrors having a fold-down cover of the invention is as follows: Figure 6 and, schematically, Figure 7 show how the cover 2 is in the open to view position of the mirror surface SE . Under these conditions, the holding springs R , which, independently of the position occupied by the cover 2, are constantly under tension as said above, while pressing against the casing 1 by means of the through hooking orifices 6, act on the cover 2 by way of the through thrust orifices 8. In this way, the holding springs R fix the open position of the mirror surface SE , preventing the normal vibrations generated by the vehicle while running from causing the mirror surface SE to be concealed by untimely folding down of the cover 2; to conceal the mirror surface SE the user only has to apply a force in the pertinent direction on the front edge of the cover 2, the purpose of this force being to overcome the moment of rotation exerted by the holding springs R on the cover 2 and cause the latter to rotate to the position shown in Figure 8 and schematically in Figure 9. As from this position, it is no longer necessary for the user to continue exerting any pressure on the cover 2 since the action of the holding springs R , which reverse the moment of rotation applied thereby to the cover 2 relative to the preceding positions, automatically drives said cover 2 to the concealment position shown in detail in Figure 10 and schematically in Figure 11; in this position, in which the mirror surface SE is concealed, in a similar way to the one described above, the action of the holding springs R prevents untimely opening of the cover 8; for the cover 2 to move to the initial or open to view position of the mirror surface SE , the user only needs to apply a pressure to the front edge of the cover 2 in the corresponding direction, said force being to overcome the pressure of the holding springs R to attain the position shown in detail in Figure 8 and schematically in Figure 9. From this position, in a similar way as described above, the user need not exert any further pressure on the cover 2, since the action of the holding springs R on the cover 2 will drive it automatically to the position shown in Figure 6 and schematically in Figure 7, where the above described initial situation, i.e. where the mirror surface SE is open to view, is attained.

Claims: A semi-automatic opening and closing device for sunvisor mirrors having a folddown cover being constituted by two identical holding springs ( R ) arranged in the interior of the minor ( E ) casing (1), one on each of the short sides thereof, close to the corresponding axis of rotation ( G ), said holding springs ( R ), which are each attached to the casing (1) and to the cover (2) of the mirror ( E ) by way of corresponding retaining means ( MR ), being permanently under tension with one of the respective ends ( 5b' ) thereof hooked in the casing (1) and the other respective end ( 5a' ) acting on the cover (2), so that from an intermediate position of the possible rotary path of the cover (2) two opposite automatic directions of rotation of the cover (2), which are the opening and the closing directions, are determined, characterized in that said two identical holding springs are permanently under torque with their other respective ends ( 5a' ) mounted directly on the cover (2). The semiautomatic opening and closing device for sunvisor mirrors having a fold-down cover of claim 1, characterized in that the retaining means ( MR ) attaching the holding springs ( R ) to the mirror ( E ) casing (1) and cover (2) are formed by: two mutually opposite hooking orifices (6) in the sides of the mirror ( E ) casing (1) transverse to the axis of rotation ( G ) of the cover (2), at a relatively short distance from said axis of rotation ( G ), in each of which orifices there is hooked one end ( 5b' ) of the corresponding holding spring ( R ), which ends ( 5b' ) may rotate freely in their place of hooking; two mutually opposite thrust orifices (8) in the sides of the mirror ( E ) cover (2) transverse to the axis of rotation ( G )of the cover(2), each of which orifices houses the other end ( 5a' ) of the corresponding holding spring ( R ), which ends ( 5a' ) may rotate freely in their housing, with the condition that the virtual longitudinal axis ( LV2 ) defined by said thrust orifices (8) is at a greater distance from outer surface ( ST ) of the cover (2) than the longitudinal axis of rotation ( G ) of said cover (2), and with the condition that the said virtual longitudinal axis ( LV2 ) is at a smaller distance from the front edge (10) of the cover (2) than the longitudinal axis of rotation ( G ) thereof.

Inventors: AYMERICH MUNOZ JOSE, PRAT CASTAN JESUS, AYMERICH MUNOZ, JOSE, PRAT CASTAN, JESUS, AYMERICH MUNOZ, José, PRAT CASTAN, Jesús
Applicants: FICO ITM SA, FICO I.T.M., S.A.
Application year: 1991
Main classification: B60J3
IPC codes: B60J3, E05F1, E05D11