BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the two stage retention spring clip of present invention showing its construction.
FIG. 2 is a cut away side view of the retention spring clip of FIG. 1 retaining an automotive trim piece in place.
FIG. 3 is another view of the two stage retention spring clip in FIG. 2 after the air curtain has deployed, showing the clip retaining the trim piece in place while allowing the air curtain to deploy.
FIG. 4 is another embodiment of the two stage retention spring clip of the present invention showing its construction.
FIG. 5 is another embodiment of the two stage retention clip of the present invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT(S)
Turning now to the drawings wherein like numerals refer to like structures, and particularly to FIG. 1, there is shown therein a perspective view of two stage retaining spring clip 10. Clip 10 is constructed in one piece and may be made of a resilient material such as metal, such as steel or any other metal, or plastic or any other resilient material to present a unitary structure.
The clip of FIG. 1 is equipped with an insert nose portion 12 having angled portions 14 and 16 that terminate in shoulder portions 20 and 21 respectively to form a first retaining portion 18. Shoulders 20, 21 terminating in base 23 and 23a, respectively extend at a first angle that is shown as obtuse to the centerline 22 of the two stage retaining spring clip 10, but which may be perpendicular to the centerline, or at any other angle according to the design requirements of the trim panels to be fastened together. Angled portions 14 and 16 of the insert nose portion may be equipped with optional spring flanges 24, 25. Each spring flange is a mirror of the other, and is formed of a first angled portion 11, which is oriented at the same angle as angled portion 14, and a second angled portion 13, which is angled at an angle less than the angled portion 11. Each said flange terminates in a shoulder portion 15, 17 respectively that may be angled relative to centerline 22 to provide for a more secure retention of the two stage spring clip in an aperture in a trim panel.
The outwardly extending legs 26, 27 extend from the bases 23 and 23a to form a second retaining shoulders 28, 29. The second retaining shoulders 28, 29 extend at a second angle that maybe the same or different that the angle of the first retaining shoulder, and is shown as less than the angle of the first retaining shoulder, and terminate in angled surfaces 33, and 35 respectively. Stop flanges 30, 31 extend from the outwardly extending legs at an angle that prevents the over insertion of the spring clip into an aperture by acting as a stop against the inner surface of the substrate proximal to the aperture. In addition, the stops cooperatively act to prevent the detachment of the trim piece fro the clip during air curtain deployment. In one embodiment, the stops extend substantially perpendicular from the centerline of the two stage spring clip 10.
The outwardly extending legs are equipped with opposed spring flanges 32 and 34 to provide a resiliently deflective outwardly directed force when the legs are pressed together, or when an object is inserted between them. In addition, these flanges act to permit the insertion of a post 43 integral with the trim piece and grip the post during air curtain deployment so that the trim cover is prevented from complete detachment. These spring flanges are equipped with guides 19 and 19a to assure the proper directional travel of the two stage retention pin over a post 43, as seen in FIG. 3, during insertion of the pin to retain the trim cover in place. As seen in FIG. 1, the outwardly extending legs terminate in flanges 37 and 36, respectively.
As seen in FIG. 2, trim cover 39 has a pin 43 that is insertable between guides 19, 19a and opposed spring flanges 32 and 34. When the clip is inserted into aperture 38 of doghouse 46, the legs open in a scissor like manner as they ride over post 43. When the pin is inserted fully into the aperture 38, the legs snap back into their original configuration and act to secure the clip into the dog house and the trim cover in place.
Continuing with FIG. 2, there is shown the two stage spring clip of FIG. 1 in an automotive application. As shown therein, a first substrate, such as a trim cover 39, is secured into place on a second substrate, such as, for example, the A pillar 40 of an automobile. Specifically, the clip is inserted into an aperture 38 and retains the trim cover 39 in place on the A pillar 40 of an automobile interior. Those skilled in the art will recognize that only the second retaining shoulders 28 and 29 are actually retaining the trim cover tightly in place on the pillar. It is to be noted that the second shoulder has an inclined shoulder surface, and that the first retaining shoulder has an inclined shoulder that is preferably a perpendicular retaining surface, but may be any angle relative to the centerline, and is shown as greater than the angle incline of the second retaining shoulder. Both the first shoulder and the second shoulder, in their un-deformed states, are larger than the aperture 42 of the trim cover into which they are inserted. Air curtain 44 is shown by the dotted lines in its undeployed state.
Turning again to FIG. 3, when air curtain 44 is deployed, it exerts force against the trim cover, and the force against the trim cover causes the entire trim cover to move outwardly from the force, and forces the second retaining shoulder to engage the aperture. Because the second retaining shoulder is inclined at an angle that is small relative to the centerline of the clip, the force from the air curtain deployment forces the inclined surfaces of the clip to pass through the aperture and the clip slightly depresses, thereby freeing the clip from retention by the second retention shoulder. As the force from the air curtain continues to exert force against the trim cover, it separates from the pillar the length of the outwardly extending legs until the first retaining shoulders meet the aperture. Because the first retaining shoulders are inclined at an angle, shown as greater than the incline of the second shoulder, and preferably substantially perpendicular to the centerline of the clip, it acts as a shoulder stop and the clip does not deform or permit the first retaining shoulder to pass through the aperture. In addition, the trim cover is equipped with post 43 that engages the spring clip during deployment to prevent the clip from compressing proximal to the first retaining shoulders, thereby preventing the first retaining shoulders from passing through the aperture 38. In addition, the flanges grip the post so that the trim cover does not disengage from the clip and become free during air curtain deployment. By way of explanation, during assembly, the post 43 is inserted through guides 17 and 19 and encounter flanges 24 and 25. Spring flanges 24 and 25 engage the post, thereby preventing disengagement of the spring clip from the post during air curtain deployment. The trim cover, positioned between the first retaining shoulder and the stop flanges on the clip cannot travel any further than the length of the outwardly extending legs of the clip and the trim cover does not become a projectile within the vehicle interior during deployment of the air curtain. Indeed, the clip is dimensioned such that the trim cover may be dislodged from about 13 mm to about 15 mm from the pillar to permit deployment of the air curtain and to prevent the trim cover from becoming freed from any attachment to the pillar.
FIG. 4 illustrates another embodiment of the spring clip of the present invention. Specifically, the two stage spring clip 48 is a unitary structure that is made of any resilient material and preferably is formed from a single piece of resilient spring steel.
A pair of legs 50, 52 is joined as a unitary piece and presents a substantially U shaped profile. Each of the legs 50, 52 is equipped with opposed deflection tabs 54, 56, and 58 and 60, respectively. The first set of deflection tabs may further operate a guide to ensure the pin 43 of the trim cover travels between the legs during deployment of the air bag as set forth with the embodiment of FIGS. 1-3 above. The deflection tabs further act to retain the post 43 in place so that, as described with the embodiment of FIGS. 1-3, the trim cover does not become free of the two stage retention clip. The legs terminate in stops 62 and 64. Each stop is equipped with a leg portion 66 and 68 that terminates in shoulder 70 and 72, respectively. Each shoulder is oriented to be substantially perpendicular to the centerline 74. The insert nose portion 76 is formed of angled inclined surfaces 78 and 80 that join shoulders 70 and 72, and the inclined surfaces are spaced apart from each other. Inclined surface 78 is equipped with at least one flange 82 and inclined surface 80 is equipped with a recess 84 cooperative to said flange. The flange and recess operate to limit the inward deflection of the nose portion during insertion of the clip into a recess.
In operation, the spring clip of this embodiment operates in a manner substantially the same as that described for the embodiment of FIGS. 1 through 3, with the exception that the pin on a trim cover as described above would be inserted between the legs 50, 52 of this embodiment and limited to the travel possible within the confines of the U leg shape structure of this embodiment instead of engaging the nose portion of the spring clip as described in the embodiment of FIGS. 1-3 above.
FIG. 5, shows another embodiment of the present invention, and may be seen as a variety of the embodiment shown in FIG. 4. Specifically, clip 86, is equipped legs 88 and 90 to present a substantially U shaped structure. This U shaped structure is equipped with at least one re-enforcement rib 92, and 94 at least partially overlying said U shaped legs to facilitate gripping of the post 43 (not shown) of the trim cover by the clip. In addition, nose portion 95 is equipped with least one, and preferably each inclined surface 96 and 98 that has at least one flange, and preferably a pair of flanges 100, 102 and 104 and 106, respectively that engage the inner surface of the substrate proximal to the aperture into which the pin is inserted to provide for improved retention during air curtain deployments. In operation, this embodiment operates as set forth for FIGS. 1-4 above.
The unitary two way clip shown in the embodiments set forth above are of advantage in moveably fastening a first substrate to a second substrate through cooperatively aligned apertures in the substrates. The clip is configured such that one substrate can be fastened to the clip to permit the clip to be moved upon application of force to the substrate fastened to the clip and the clip partially disengages from the apertures, permitting the clip to pass through the aperture a predetermined distance until the first retaining shoulders come into contact with the area proximal the apertures and engages that area, thereby preventing the clip and aperture from completely disengaging.
The words used in the description of the invention are words of illustration and not words of limitation. Those skilled in the art will recognize that many modifications and variations are possible without departing from the scope and sprit of the invention as set forth in the appended claims.
Patent Application
20080028577
