Abstract:
A clip (2) fitted by snapping into a component-carrying lug (40) and then snapped into the head (5) of a nut/pin (1). The assembly thus formed is advantageously further complemented by a screw (15) which can also be engaged in the nut and can be presented en bloc opposite a aperture (51) formed for this purpose in a support (50).

Description:
FIELD OF THE INVENTION 
     The present invention concerns a device for fixing a component to a support, and more especially a support which is not accessible from behind, this device being of the snapping nut type molded from plastic. 
     BACKGROUND OF THE INVENTION 
     Various forms of devices of this type are known, but their use still presents problems, notably in relation to access, even from the front. 
     Difficulties may thus be encountered in the fixing of the component onto the support, such an operation necessitating the disposition of the component in front of the nut previously inserted into a housing, and then the positioning of a screw generally fitted with an application washer or similar element, this screw having to pass through a component-carrying lug so as to be engaged in the nut and finally screwed into it. 
     OBJECT OF THE INVENTION 
     The present invention proposes to this end a device which greatly facilitates this type of operation. 
     SUMMARY OF THE INVENTION 
     The present invention proposes to this end a device for fixing a component to a support comprising a nut body adapted to fit into an opening formed for this purpose in a wall of a support, this body comprising a shaft with a head on top, this head having a bearing face and a reception face, characterized by the association with a the nut body of a clip adapted to receive, with snapping-in operation, a component-carrying lug and then to snap itself into the said reception face of the head. 
     A component/nut/clip assembly is thus obtained which is suitable for being pre-assembled ready so as to receive a fixing screw, so as to be able to be snapped, in a single operation, into a housing provided for this purpose on the support to which the said component is to be fixed. The screwing of the screw, pre-engaged in the nut, consequently enables the component to be fixed firmly to the support. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The characteristics and advantages of the invention will moreover emerge from the description which follows by way of example with reference to the accompanying drawings, in which like reference characters designate like or corresponding parts throughout the several views,and wherein: 
     FIG. 1 is a front view of a nut according to the present invention, 
     FIG. 2 is a plan view of the nut, 
     FIG. 3 is a view in cross section of the clip, in the direction 3--3 in the preceding figure; 
     FIG. 4 is a view similar to that of FIG. 1 illustrating the engagement of the holding clip according to the invention, in a component-carrying lug; 
     FIG. 5 is a view similar to that of FIG. 1 showing the component-carrying lug thus mounted with the clip pressed down on the head of the nut; 
     FIG. 6 is a similar view, showing a screw engaged in the lug/nut assembly, 
     FIG. 7 is a front view showing the component-carrying lug, nut, and screw assembly thus formed, disposed in front of a support opening; 
     FIG. 8 is a view in cross section of the said assembly engaged in the support; and 
     FIG. 9 is a similar view in cross section, with the screw engaged to its full extent in the nut body. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     According to the embodiment chosen and depicted, the device comprises a nut body 1 and a holding clip 2, connected to each other by a fastener 3. 
     The body 1 comprises, as shown, a shaft 4 supporting a head 5. The head 5 has a bottom face 6 called a bearing face and a top face 7 called a reception face. 
     According to the embodiment chosen, the faces 6 and 7 are not parallel to each other, but it is quite possible to imagine another embodiment in which the said faces are mutually parallel. 
     The shaft 4 and the head 5 have a slot 8 passing through them, splayed towards the top approximately from the mid-height of the shaft 4. 
     The shaft 4, which has a rectangular cross section overall, has, as shown, on two parallel faces serrations 9 and an anchoring area 10 adjacent to the bearing face 6 and perpendicular thereto. Furthermore, an axial bore 11 is formed in the nut body 1 so as to form therein a blind hole extending downwardly adjacent to the end face 12. 
     This face 12 has a bevelled part 13 parallel to the bearing face 6 and a part 14 parallel to the reception face 7. 
     On the bearing head 5, there is formed a catch 16 for retaining the clip 2. 
     The clip 2 is connected to the nut body 1 by a fastener 3 extending, as may be seen in FIG. 2, in line with the reception face 7 of the head 5 and perpendicular to the slot 8. 
     The clip 2 has a head 20, with four blades 21, 22, 23 and 24 on top. The four blades 21, 22, 23 and 24 are disposed on a circle, distributed in pairs on two mutually perpendicular radial lines. Thus the diametrically opposed blades 21, 23 are disposed on a radial line parallel to the slot 8. The other radial line, meanwhile, in line with the fastener 3, carries the two other blades 22, 24. 
     The two blades 21, 23 each have a guide rib 25 (FIG. 2). The blade 22 (FIG. 3), opposite the fastener 3, has at its free end an external tooth 26 and an internal tooth 28; the blade 24, adjacent to the fastener/clip connection, has an external tooth 27 at approximately two thirds of its height and an internal tooth 29 at its end. 
     The head 20 of the clip 2 has a recessed central area 30 with a diameter sufficient to permit the passage of a screw 15 or an equivalent element. 
     With reference to FIGS. 4 to 9, the procedure for the fitting of a component (not shown) fixed to a component-carrying lug 40 with a hole or passage 41 in it (FIG. 4), in which the first step is to engage the clip head 20 by snap-engaging the same, will now be described. The four blades 21, 22, 23 and 24 will retract elastically. Only the external tooth 27 of the blade 24 will be locked in contact with the component-carrying lug 40. The latter is consequently retained between the clip head 20 and the tooth 27 of the blade 24. 
     The clip 2 is then engaged on the nut body 1, whilst tilting the latter, the fastener 3 being of sufficient length to enable the nut body 1, with respect to the component-carrying lug 40, clip assembly, to pivot with flexion of the fastener 3. 
     The snapping-in (FIG. 5) of the clip 2 on the head 5 is facilitated by the presence of the two ribs 25 disposed parallel to the slot 8; the ribs 25 being adapted to engage in the slot 8. The engagement of the ribs 25 in the slot 8, which leaves a clearance enabling the nut 1 to retain its elasticity, affords guidance which enables the tooth 26 on the blade 22 to be snapped firmly under the catch 16 formed on the nut head 5. 
     The component-carrying lug 40 is consequently fixed to the body/clip assembly. There follows (FIG. 6) the positioning of the expansion screw 15, which finds its passage through the hole 41 in the component-carrying lug 40, and then the recessed central area 30 of the clip 2, to find its end disposed at the entry to the axial bore 11. 
     A simple pressure exerted on the expansion screw 15 enables the thread of the screw 15 to pass through the teeth 28, 29 on the blades 22, 24 of the clip head 20; the screw 15 is thus fixed to the clip/nut assembly. 
     The assembly formed by the component-carrying lug 40, the nut 1 and the screw 15 can be engaged, in a single operation, in a an aperture 51 formed in a support 50 of any shape (FIG. 7). 
     The precise positioning of the assembly thus obtained is made notably through the bearing face 6 cooperating with the surface of the support 50 and 20 with the elasticity retained by the nut body 1 up to this point. This positioning is, moreover, facilitated by the specific shape of the bevelled part 13 of the distal face 12 of the shaft 4. 
     In order to complete the fitting, the expansion screw 15 simply needs to be screwed in fully, thereby locking, through the degree of freedom resulting from the slot 8, the fixing area 10 against the corresponding walls of the aperture 51 as the screw 15 advances, with self-screwing into the bore 11. The fixing operation thus obtained (FIG. 9) is improved and strengthened by the plastic deformations which the serrations 9 undergo. 
     Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the present invention may be practiced otherwise than as specifically described herein.