SPRING-HINGE OF SUN VISORS FOR MOTOR VEHICLES

Abstract: The spring-hinge is a single piece part and has a substantially parallelepipedic shape and is preferably made from a steel plate having a high flexibility and quadrangular contour, and configures longitudinally, in its upper area, a housing (1) for the reception with tightness of the rotation axis (4) of an elbowed support (5); in its central area, a narrowing (2); and in its lower area, an orthometric portion (3). Each of the side faces (11, 11') of the orthometric portion (3) is prolonged internally into a bend extension (12, 12') whose free end has a terminal wing (17, 17') bent and oriented towards the housing (1) of the upper area and has two transverse traversing grooves (13) originating in the narrowing (2) and defining two side or fixing wings (14, 14') and a central flexing tightening wing (15, 15'). Application to the car industry.

Description: Field of the invention The object of the present invention is a spring hinge for automobile sunvisors which, particularly, is applicable to sunvisors having a structure formed on a hollow body member produced by blow moulding of a plastic material. Background of the invention It is well known that the sunvisors normally fitted as original equipment in automobiles have a hinge formed, basically, by a pivot pin forming part of a bracket member attached to the vehicle structure and normally attached to the vehicle roof and by a spring which is fixedly attached to the sunvisor. Said spring receives and retains said pivot pin so that the sunvisor may be rotated around said pivot pin and firmly hold any position, as selected by the user, in which it is placed among the normal positions of use. Furthermore, said pivot pin and retaining spring are provided with means, generally formed by respective positioning flats, which more firmly set the rest position or positions of the sunvisor. In sunvisors structured on a hollow body member of essentially prismatic shape produced by blow moulding of a plastic material and in which the retaining spring, which is in reality a spring hinge, because both functions are combined in a single member, is housed completely within said hollow body member, the retaining spring is accessible from the outside by means of a through hole provided to such end in the hollow body member, it being through said through hole that the retaining spring receives the corresponding portion of the pivot pin of the bracket member. As an example of known embodiments of sunvisors such as those described above, in which the retaining spring, i.e. the spring hinge, is completely housed within the hollow body member, there may be cited Spanish patent P 9100391 filed under the priority date of 14.02.91 and published on 03.09.92 (September 3 rd , 1992) under the publication number WO-A 92/14623. Said patent P 9100391 (WO-A-92/14623) discloses a retaining spring of essentially rectangular form, which is symmetrical about its longitudinal plane, defining two superimposed respectively semicylindrical and prismatic portions, in which the semicylindrical, or upper, portion receives the pivot pin of the bracket member. The retaining spring disclosed in Spanish patent P 9100391 is positionally fixed inside the hollow body member by way of a plurality of recesses formed in the walls of said body member and flanking it and by the resilience of the spring itself, the side walls of which press directly against the corresponding inner surfaces of the side walls of the hollow body member. The fact that the retaining spring bears directly on the said inner surfaces of the hollow body member means that when the user moves the sunvisor from the rest position(s) to any other position of use, or when the sunvisor is moved precisely to the rest position(s), the action of the pivot pin on the retaining spring, by deforming it, causes in turn deformation of the hollow body member after an extended period of use, precisely in the immediate surroundings of the position occupied by the retaining spring. Such deformation of the sunvisor hollow body member may be sufficiently serious to be felt by the touch, which is a drawback and, at times, even gives an irregular finish to the sunvisor. Summary of the invention With a view to providing a new embodiment of retaining spring hinge which, being fully housed in the hollow body member of the sunvisor, does not cause any deformation of the hollow body member and, consequently, of the sunvisor, as a result of the friction of the pivot pin of the bracket member on the spring hinge during the changes from or to the rest position(s) of the sunvisor, there is disclosed a spring hinge for automobile sunvisors having a new structure. The sunvisor spring hinge of the invention is one-piece and is made from highly resilient material, preferably from a quadrangular shaped steel sheet. Said spring hinge is essentially parallelepipedic with rounded edges and is open at two opposite sides. It is symmetrical relative to the longitudinal central plane thereof and forms, with one side and the two forming a right angle therewith, defining the upper region of the spring hinge, a longitudinal housing for grippingly receiving the corresponding portion of a pivot pin of the bracket member, said housing defining, on the side walls thereof, respective positioning flats dimensioned in correspondence with the positioning flats of the pivot pin; at the intermediate region thereof, a longitudinal narrowing; at the lower region thereof, an essentially rectangular longitudinal portion, the side walls of which are projected outwardly slightly more than the side walls of the housing in the upper portion of the spring hinge; and, the wall of the rectangular portion facing the housing of the upper region being formed by respective bent extensions of the side walls with which it forms a right angle, (Spring hinge of the type disclosed e.g. in DE-B-2551633), characterized in that: said extensions are provided longitudinally at the free end thereof with respective bent terminal flanges directed towards the said housing; each of the two side walls of the rectangular portion and their respective bent extensions have two transverse slots starting out from the central or narrowed region, said slots being formed by removing material of the hinge spring and said slots being arranged, preferably, in such a way that they define at the end of the side walls and at the respective bent extensions the side or attachment tabs, respectively, and in the central portion thereof, central flexing grip tabs, and the central flexing grip tabs project a relatively short distance beyond the attachment tabs, said attachment tabs, when the spring hinge is fully housed in the sunvisor hollow body member, are permanently at a relatively short distance from the corresponding inner walls of the hollow body member. In accordance with a further characteristic embodiment of the spring hinge for automobile sunvisors of the invention, the sunvisor comprises all the operative members described above and is characterized in that at least on one of the side walls of the rectangular portion and an the central flexing grip tab thereof there is a tongue having the free end thereof bearing against the inner surface of said central flexing grip tab facing it, with the lesser or greater length of the tongue determining a greater or lesser gripping pressure, respectively, of the spring hinge on the pivot pin of the bracket member. The features of the spring hinges of the invention described above provide a solution to the problems caused by the resilient deformation of the known embodiments of retaining springs wholly housed in the sunvisor hollow body member. With the retaining spring pressing permanently against the corresponding inner walls of the hollow body member, this deformation, as said before, causes deformation of the body member and, consequently, of the sunvisor. In fact, when the spring hinge of the invention is wholly housed in the hollow body member such that its attachment tabs are permanently at a relatively short distance from the corresponding inner side walls of the hollow body member, preferably by means of retaining projections provided to such end in the hollow body member itself, the passage of the sunvisor from or to the rest position(s) causes in the spring hinge, by the action of the pivot pin of the bracket member, resilient deformation of the central flexing grip tabs thereof, without this resilient deformation being transmitted in any way to the hollow body member; in fact, the distance between the attachment tabs of the spring hinge and the corresponding walls of the hollow body member, which distance is determined by the said retaining projections provided for the purpose, prevents the central flexing grip tabs from contacting the said walls of the hollow-body member during their resilient deformation under normal conditions of use. Brief description of the drawings The spring hinge for automobile sunvisors of the invention is illustrated in the two sheets of drawings accompanying this specification. In the drawings: Figure 1 is a side view of showing an embodiment R1 of the spring hinge of the invention. Figure 2 is a front view of the spring hinge of the invention shown in Figure 1. Figure 3 is a side view of the embodiment R1 of the spring hinge of the invention housed in the hollow body member of a sunvisor. Figure 4 is a cross-section view of the embodiment R1 of the spring hinge of the invention mounted on the pivot pin of a bracket member in the rest position. Figure 5 is a cross-section view of the embodiment R1 of the spring hinge of the invention mounted on the pivot pin of a bracket member in a position other than the rest position. Figure 6 is a side view showing an embodiment R2 of the spring hinge of the invention. Figure 7 is a front view of the spring hinge of the invention shown in Figure 6. Figure 8 is a cross section view on the line VIII-VIII of Figure 6. Detailed description of the embodiment The spring hinges R1 and R2 for automobile sunvisor hinges of the invention described as an embodiment are essentially parallelepipedic in shape with rounded edges and are symmetrical about the longitudinal central line thereof, as shown in Figures 1 , 2, 6 and 7. The spring hinges R1 and R2 of the invention are preferably formed from a highly resilient steel sheet, having a quadrangular profile. Both spring hinges R1 and R2 have like members which, for greater clarity of description, are designated, in this description and in the drawing figures, with the same reference numerals. In this way, hereinafter, the embodiment of the spring hinge R1 of the invention and shown in Figures 1 to 5 is given and this description is equally applicable, by extension, to the spring hinge embodiment R2 of the invention shown in Figures 6 to 8. Figures 1 and 2 show how the spring hinge R1 is formed longitudinally by: at the upper region thereof, the housing 1, at the intermediate region thereof, the narrowing 2, and at the lower region thereof, the rectangular portion 3. In this embodiment of the spring hinge R1 , the housing 1 is shorter than the narrowing 2 and the rectangular portion 3. Said housing 1 is centered relative to the transverse central line of the spring hinge R1 . Obviously, the length of the housing 1 is given in dependence of the needs of each particular application, without this affecting the correct operation of the spring hinge R1 of the invention, the same being equally applicable to the narrowing 2 and to the rectangular portion 3. Figures 2, 4 and 5 show how the housing 1 is, in this embodiment, essentially semicylindrical and is dimensioned in such a way that, as shown in Figures 3, 4 and 5, it may grippingly receive the pivot pin 4 of the bracket member 5 which, as said above, is attached to the automobile structure. Figures 2, 4 and 5 show how the housing 1 of the spring hinge R1 is formed with the two positioning flats 6 and 6' which are dimensioned in functional correspondence with the positioning flats 7 and 7' which are formed longitudinally on the pivot pin 4 of the bracket member 5, as shown in Figures 3, 4 and 5. Figures 3, 4 and 5 show how the spring hinge R1 is housed in the interior of the hollow body member 8, which is produced by blow moulding of a plastic material, of the sunvisor and which, for greater clarity of disclosure, has been shown only in part. In said Figures 3, 4 and 5, the spring hinge R1 is housed in the end of the hollow body member 8 corresponding to the position occupied by the bracket member 5 and is accessible from the outside only through the through hole 9 formed for such purpose in the hollow body member 8. The spring hinge R1 is fixed in position by way of three recesses 10 formed on each of the corresponding side walls of the hollow body member 8 and which flank the spring hinge R1 , as shown in Figure 3. It is understood that the number and arrangement of the recesses 10 may vary depending on the needs of each particular application and/or the shape given to the spring hinge R1 . Figures 1 to 5 show how the narrowing 2 forms longitudinally the intermediate region of the spring hinge R1 defining respective essentially rectangular portions which merge into the housing 1 and in to the rectangular portion 3 at an angle therewith. Figures 2, 4 and 5 show how the two side walls 11, 11' of the rectangular portion 3 are extended, along the whole of the length thereof, in respective bent extensions 12, 12' , the free ends of which, also along the whole length thereof, define respective bent terminal flanges 17, 17' which are directed towards the housing 1 of the spring hinge R1 . Each of the two side walls 11 and 11' , as well as the respective bent extensions 12 and 12' thereof, of the rectangular portion 3 have, respectively, the two slots 13 which are transverse to the spring hinge R1 and extend from the narrowing 2, as shown in Figures 1 and 3. The two slots 13 of each of the two side walls 11, 11' and of the respective bent extensions 12, 12' , are arranged symmetrically on both sides of the transverse central line, as shown in Figures 1 and 3 and define, at the ends of the side walls 11 and 11' , and at the respective bent extensions 12 and 12' , the side or attachment tabs 14 and 14' respectively and, in the central portion thereof, the central flexing grip tabs 15 and 15' , respectively. Figures 3, 4 and 5 show how the hollow body member 8 of the sunvisor is formed internally on both side walls, between the positioning recesses 10, with essentially cylindrical attachment projections 16, although they may be of any other shape, such as prismatic, which is appropriate for each particular application. When the spring hinge R1 is housed in the hollow body member 8 of the sunvisor, as shown in Figures 3, 4 and 5, the attachment projections 16 are arranged in such a way as to be superimposed on the attachment tabs 14 and 14' , the attachment projections 16 being dimensioned in such a way as to maintain the attachment tabs 14 and 14' at a relatively short distance from the inner surface of the corresponding side walls of the hollow body member 8. Figure 4 shows how the spring hinge R1 is disposed inside the hollow body member 8 once the pivot pin 4 of the bracket member 5 has been fitted into the housing 1 of the spring hinge R1 , through the through hole 9 formed in the hollow body member 8. In Figure 4, the hollow body member 8 of the sunvisor occupies the rest position. Under these conditions, the positioning flats 6, 6' of the housing 1 of the spring hinge R1 bear, under the action of the spring hinge R1 itself, on the positioning flats 7 and 7' respectively of the pivot pin 4 of the bracket member 5 This pressure, under normal conditions of use, prevents the vibrations caused when the vehicle is running from causing untimely release of the sunvisor. Figure 4 shows how in the rest position, urged by the pivot pin 4 of the bracket member 5, the central flexing grip tabs 15 and 15' of the spring hinge R1 project a relatively short distance beyond the attachment tabs 14 and 14' respectively, without touching the inner surface of the corresponding side walls of the hollow body member 8 in any case. Figure 5 shows a position other than the rest position occupied by the hollow body member 8 of the sunvisor. In this position, the gripping action of the positioning flats 6 and 6' of the spring hinge R1 on the pivot pin 4 of the bracket member 5 prevents untimely release of the sunvisor, as described above. In this position of the hollow body member, the pivot pin causes resilient deformation of the central flexing grip tabs 15 and 15' of the spring hinge R1 in such a way that they project out beyond the attachment tabs 14 and 14' respectively further than in the rest position shown in Figure 4, without the central flexing grip tabs 15, 15' touching the inner surface of the corresponding side walls of the hollow body member 8 in any case, as mentioned above for the rest position. In this way, the features of the spring hinge R1 of the invention prevent the resilient deformation of the spring hinge from being transmitted to the hollow body member 8 of the sunvisor, while moving the sunvisor from the rest position shown in Figure 4 to any other position, as might be the one shown in Figure 5, and vice versa. In this way, the hollow body member 8 and, consequently, the sunvisor do not suffer any deformation, as happens with the known embodiments of retaining springs fully housed in the hollow body member of sunvisors. Figures 6 to 8 show an embodiment of the spring hinge R2 of the invention which, as said before, comprises all the elements described for the embodiment of the spring hinge R1 of the invention. Figures 6 to 8 show how the central flexing grip tab 15 of the side wall 11 of the rectangular portion 3 of the spring hinge R2 is provided with the tongue 18, the free end of which bears perpendicularly against the inner side wall of the central flexing grip tab 15' facing it. In this embodiment of the spring hinge R2 , the tongue 18 is on the central flexing grip tab 15 although it could obviously be on the central flexing grip tab 15' facing it and bear against the other central flexing grip tab 15, without this affecting the operation of the spring hinge R2 . Figures 7 and 8 show how, in this embodiment, the tongue 18 of the spring hinge R2 is coextensive with the wall of the rectangular portion 3 formed by the bent extensions 12 and 12' , respectively. It will be understood that, precisely the shorter or greater length of the tongue 18 will determine the greater or lesser gripping pressure, respectively, of the positioning flats 6 and 6' of the spring hinge R2 on the pivot pin of the bracket member 5, without this affecting the operation of the spring hinge R2 which is no different from that as described for the spring hinge R1 .

Claims: A spring hinge for automobile sunvisors which is one-piece and made from highly resilient materials, preferably made from a quadrangular shaped steel sheet, said spring hinge being essentially parallelepipedic with rounded edges and open at two opposite sides thereof, being symmetrical relative to the longitudinal central plane thereof and forming an internal upper cavity between the internal extreme side and the two sides forming angle with said extreme side, this cavity forming a longitudinal housing in the upper region of the spring hinge, the housing being able to grippingly receive the corresponding portion of a pivot pin (4) of the bracket member (5), said housing (1) defining, on the side walls thereof, respective positioning flats (6, 6' ) dimensioned in correspondence with the positioning flats (7, 7' ) of the pivot pin (4); at the intermediate region thereof, a longitudinal narrowing (2); at the lower region thereof, an essentially rectangular longitudinal portion (3), the side walls (11, 11' ) of which are projected outwardly slightly more than the side walls of the housing (1) in the upper region of the spring hinge; and the wall of the parallelepipedic spring hinge opposite to the housing (1) at the upper region (1) being formed by respective bent extensions (12, 12' ) of the side walls (11, 11' ) with which they form a right angle, and it is characterized in that: said extensions (12, 12' ) are provided longitudinally at the free end thereof with respective bent terminal flanges (17, 17' ) directed towards the said housing (1); each of the two side walls (11, 11' ) of the rectangular portion (3) and their respective bent extensions (12, 12' ) have two transverse slots (13) starting out from the central region or narrowing (2), said slots (13) being formed by removing material of the spring hinge and said slots being arranged, preferably, in such a way that they define at the end of the side walls (11, 11' ), and at the respective bent extensions (12, 12' ) the side or attachment tabs (14, 14' ), respectively, and in the central portion thereof, central flexing grip tabs (15, 15' ), and the central flexing grip tabs (15, 15' ) project a relatively short distance beyond the attachment tabs (14, 14' ), said attachment tabs (14, 14' ), when the spring hinge is fully housed in the sunvisor hollow body member (8), are permanently at a relatively short distance from the corresponding inner walls of the hollow body member (8). A spring hinge for automobile sunvisors according to claim 1, characterized in that at least on one of the side walls (11, 11' ) of the rectangular portion (3) and on the central flexing grip tab (15, 15' ) thereof there is a tongue (18) having the free end thereof bearing against the inner surface of said central flexing grip tab (15, 15' ) facing it, with the lesser or greater length of the tongue (18) determining a greater or lesser gripping pressure, respectively, of the spring hinge on the pivot pin (4) of the bracket member (5).

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: 1993
Main classification: B60J3
IPC codes: B60J3