FIELD OF THE INVENTION

The present invention relates to a fastening nut, of the type used for fixing panels and applications thereto, with provision of a device for securing thereof, the special feature being that elastic fixing means are provided in a nut which, as a result of its constructional design, is quick- fitting .

PRIOR ART

A plurality of nuts exist for fixing panels and/or accessories thereto, for example in the automobile industry, these being intended to be fastened to holes formed in the panels, providing a securing point and fixing said panels. In general, said fixing means use sets of flexible legs which lock against the edges of the hole in the panel once they pass through it.

These solutions, m general, are unable to provide protection against rotational movements since rotation of the part is prevented merely by the joining pressure between the legs of the clip and the surface of the panel. In some applications tightening of the fastening nut of the assembly or the accessory to be retained may force rotation of the clip nut in an undesirable manner.

It is one of the main objects of the present invention to provide a nut for fixing panels and applications thereto, provided with a control system preventing rotation of said nut .

Another of the main objects of the present invention is to provide a quick-fitting nut for fixing panels and accessories thereto which allows adaptation for use thereof with a different number of panels and which results in a solid and stable joint.

These and other advantages of the present invention will become clear during the course of the description thereof.

BRIEF DESCRIPTION OF THE INVENTION

The present invention describes a fastening nut formed by a base surface which has a threaded cylinder for receiving a screw for fixing an application, said base having, extending downward therefrom, spring elements which are flexible and resilient in a direction lateral to the vertical direction of downward extension thereof, said spring elements operating in combination with a fixing plate which has openings or slots for receiving said spring elements which interfere with them.

The panel or panels to be fixed by said invention may have different thicknesses due to the fact that the length of the spring elements allows them to be fixed in the fixing plate at different heights.

In another of the possible embodiments of the present invention, said spring elements incorporate one or more retaining claws for locking the fixing plate in position and preventing said spring elements from being accidently separated or coming out.

In this way all the predefined objects are achieved by providing a rapid-fastening nut for supporting panels and accessories associated therewith which prevents rotation and can be adapted to a different number of thicknesses of panel to be fixed, in accordance with specific requirements of each application . BRIEF EXPLANATION OF THE DRAWINGS

The invention will be understood more clearly with reference to the accompanying sheet of drawings provided merely by way of a non-limiting example of the invention.

Figure 1 shows a perspective view, with parts separated and aligned, of a nut according to one of the preferred embodiments of the present invention and a fixing plate or panel which has grooves for securing the spring elements of the nut.

Figure 2 shows a side view of the nut according to the preceding figure.

Figure 3 is a diagrammatic illustration of the working condition of the nut according to the preceding figures, with a panel being retained in sandwich fashion between said fixing plate and the same nut.

Figure 4 is a side view of another of the possible embodiments of the nut according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The present invention consists of a fastening nut, for example of the type used in the automobile industry for fixing panels and accessories thereto, said nut (1) being formed by a surface or base (4) which has a threaded cylinder (5) for receiving a screw for fixing an application, said base (4) having, extending downward therefrom, spring elements (6) which are flexible and resilient in a direction lateral to said vertical direction of downward extension thereof, said spring elements (6) working in combination with a fixing plate (2) which has openings or slits (7) for receiving said spring elements (6) which interfere with them, retaining said fixing plate (2) by means of the lateral force exerted by said spring elements (6) . Said openings or slits (7) may have different possible geometric forms suitable for their function, such as slotted holes or the like.

The panel (3) or panels to be fixed by the nut (1) according to the invention remain trapped in sandwich fashion between the fixing plate (2) and the base (4) of the nut (1) according to the invention.

According to its mode of use, the operator inserts the spring elements of the nut (1) inside the holes of the panel (3) to be fixed and presses the assembly against the fixing plate (2) in such a way that said spring elements (6) coincide with the grooves or slits (7) provided in said fixing plate (2) . This application pressure joins together the plate (2) and panel (3) so that the spring elements (6) are arranged in their fully inserted position. When the spring elements (6) penetrate inside the slits or grooves (7) in the fixing plate (2), they exert a double lateral force against the two inner edges thereof, in the manner of a spring, in a direction which is transverse to the direction of insertion of the nut. The retaining action obtained by said method is related to the rigidity of the material and the elastic tensioning force exerted by said spring elements (6) against the edges of the grooves (7) . This fixing action occurs, moreover, at different heights of insertion of said spring elements (6), this allowing the parts to be adapted to variations in the thickness of the panel to be retained.

It should be noted that the fixing action obtained by means of the nut according to the present invention and as a result of its constructional design is anti-rotational; namely it prevents the accidental rotation of the part installed, including opposing the torsional forces arising from tightening of the screw for fixing an accessory or application .

The spring element (6) is formed by a single part which has two downwardly extending legs (9 and 9') with a common end (10) . One of said downwardly extending legs (9'), i.e. the inner one, is more or less straight, the other one being curved outward and having, starting from the end (10) , a curved surface for gradual entry, facilitating introduction of said spring element (6) inside the grooves (7) of said retention plate. The width of the hole or groove (7) is smaller than the breadth of the legs (9, 9') of the spring element (6) . Thus, when the spring element (6) is introduced inside the groove (7), i.e. two spring elements for each groove, an elastic compression of the curvature of said leg (9) against the leg (9') occurs, said compression occurring also in the other spring element which occupies the same groove (7), with its outer legs (9) pressing against the short edges of the grooves or slits (7), producing a dual elastic force which keeps the nut pressed against said fixing plate (2) .

Said outward curvature of said outer downwardly extending legs (9) is used to increase the retention of the fixing plate (2) upon application of one of the components of the force in the vertical direction and toward the base (4), this force thus preventing the fixing plate (2) from being able to slide in this direction.

The leg (9) has at its base a widened zone (11) which provides said leg with greater solidity and rigidity, thus preventing a possible rotation of said base (4) owing to the effect of the screwing torque.

In another of the possible embodiments of the present invention, said spring elements incorporate one or more retaining claws (8) for locking the fixing plate in position and preventing said spring elements from being accidently separated or coming out.

In this way all the predefined objects are achieved by providing a rapid-fastening nut for supporting panels and accessories associated therewith which prevents rotation and can be adapted to different thicknesses of panel to be fixed or numbers thereof, in accordance with the specific requirements of each application.

The nut according to the invention is made preferably of spring steel .

It is understood that m the present case details with regard to finishing and form may be variable insofar as they do not modify the basic idea of the invention. The secondary claims describe all those elements which may be variable and which are included in the present invention.