Captive low-profile EMI grounding clip

Abstract

An EMI clip retaining system comprising a flexible EMI clip with a center contact portion that bows upwards and inwards from acute bends situated at the outer ends of the EMI clip and also comprising enlarged end portions that extend flatly inwards from the acute bends. The EMI clip is captively installable in a planar mounting surface with tapered mounting holes through which the enlarged end portions of the EMI clip are inserted, such that once the EMI clip is installed, the enlarged ends of the EMI clip reside on a bottom side of the mounting surface while the center contact portion bows upward from the opposite, top side of the mounting surface. When the center portion is compressed flat against the top side of the mounting surface, the EMI clip lies flat against both the top and bottom sides of the mounting surface.

What is claimed is:  
     
         1 . An EMI shielding device comprising: 
 an elastically deformable body portion capable of applying a contact force between a top compressing surface and a planar bottom mounting surface; and    more than one enlarged, planar end portions that may each be installed in separate apertures in the mounting surface to captively retain the EMI shielding device on the mounting surface;    wherein when an installed EMI shielding device is compressed between the compressing and mounting surfaces, the deformable body portion of the EMI shielding device lies flat between the compressing and mounting surfaces and the enlarged end portions lie substantially flat on the side of the mounting surface opposite the side facing the compressing surface.    
     
     
         2 . The EMI shielding device of  claim 1  further comprising: 
 an obtuse bend at the top of the shielding device configured to bend elastically from some static angle larger than 90 degrees to an angle of 180;  
 flat planar surfaces on either side of the obtuse bend; and  
 acute bends at the end of the planar surfaces opposite the obtuse bend;  
 wherein the enlarged end portions extend inward from the side of the acute bend opposite the planar surfaces.  
 
     
     
         3 . The EMI shielding device of  claim 2  comprising two enlarged, planar end portions.  
     
     
         4 . The EMI shielding device of  claim 2  wherein the radius of each acute bend is roughly equal to half the thickness of the mounting surface.  
     
     
         5 . The EMI shielding device of  claim 4  wherein: 
 the acute bends are also elastically deformable to permit compression of the EMI shielding device between the mounting and compressing surfaces and also to permit extension of the EMI shielding device during installation of the EMI shielding device onto the mounting surface.  
 
     
     
         6 . The EMI shielding device of  claim 5  further comprised of an electrically conductive material.  
     
     
         7 . An EMI clip retaining system comprising: 
 a flexible EMI clip with a center portion that bows upwards and inwards from acute bends situated at the outer ends of the EMI clip and also comprising enlarged end portions that extend flatly inwards from the acute bends; and    a planar mounting surface with mounting holes through which the enlarged end portions of the EMI clip are inserted during installation of the EMI clip onto the mounting surface, such that once the EMI clip is installed, the enlarged ends of the EMI clip reside on a bottom side of the mounting surface while the center portion bows upward from the opposite, top side of the mounting surface;    wherein once the EMI clip is installed onto the mounting surface, the EMI clip is captively retained by the shape of the mounting holes and also by the elastic forces within the EMI clip; and    wherein if the center portion is compressed flat against the top side of the mounting surface, the EMI clip lies flat against both the top and bottom sides of the mounting surface.    
     
     
         8 . The EMI clip retaining system of  claim 7  wherein the mounting surface holes further comprise: 
 a single aperture corresponding to each enlarged end of the EMI clip;  
 wherein the aperture shapes are mirrored about an axis centered between the apertures.  
 
     
     
         9 . The EMI clip retaining system of  claim 8  wherein the mounting hole apertures further comprise: 
 a narrow inner width that is wider than the width of the center portion of the EMI clip but narrower than the width of the enlarged end portions of the EMI clip;  
 a wider outer width that is wider than the width of the enlarged end portions of the EMI clip; and  
 contoured sides that transition from the narrow inner width to the wider outer width;  
 wherein when the EMI clip is installed onto the mounting surface, the EMI clip is elastically stretched to insert the enlarged ends of the EMI clip through the wider outer width of the corresponding mounting hole apertures; and  
 wherein once the EMI clip is installed onto the mounting surface, the enlarged portions of the EMI clip contract to reside under the narrow inner width of the corresponding mounting hole apertures thereby captively retaining the EMI clip.  
 
     
     
         10 . The EMI clip retaining system of  claim 9  wherein: 
 the mounting hole apertures are positioned so that the narrow inner widths of the apertures are approximately the same distance apart as are the insides of the acute bends in the EMI clip; and  
 wherein the wider outer widths of the apertures are not so far as to induce plastic deformation of the EMI clip as it is stretched during installation.  
 
     
     
         11 . The EMI clip retaining system of  claim 10  wherein: 
 the mounting surface thickness is approximately twice the thickness of the radii of the acute bends in the EMI clip.  
 
     
     
         12 . The EMI clip retaining system of  claim 11  wherein each EMI clip comprises two enlarged ends.  
     
     
         13 . An EMI clip retaining system comprising: 
 a flexible EMI clip with a narrow center portion and enlarged end portions; and    a planar mounting surface with mounting holes through which the enlarged end portions of the EMI clip are inserted such that the narrow center portion of the EMI clip reside on a top side of the mounting surface and the enlarged end portions of the EMI clip reside on the opposite, bottom side of the mounting surface;    wherein once the EMI clip is inserted onto the mounting surface, the EMI clip is captively retained by the shape of the mounting holes and also by the elastic forces within the EMI clip; and    wherein if the center portion is of the EMI clip compressed flat against the top side of the mounting surface, the EMI clip lies flat against both the top and bottom sides of the mounting surface.    
     
     
         14 . The EMI clip retaining system of  claim 13  wherein the narrow center portion of the flexible EMI clip further comprises: 
 acute bends situated at the outer ends of the EMI clip; and  
 a contact portion that bows upwards and inwards from the acute bends;  
 wherein the enlarged end portions extend flatly inwards from the acute bends.  
 
     
     
         15 . The EMI clip retaining system of  claim 14  wherein the mounting surface holes further comprise: 
 a single aperture corresponding to each enlarged end of the EMI clip;  
 wherein the aperture shapes are mirrored about an axis centered between the apertures.  
 
     
     
         16 . The EMI clip retaining system of  claim 15  wherein the mounting hole apertures further comprise: 
 a narrow inner width that is wider than the width of the narrow center portion of the EMI clip but narrower than the width of the enlarged end portions of the EMI clip;  
 a wider outer width that is wider than the width of the enlarged end portions of the EMI clip; and  
 tapered sides that transition from the narrow inner width to the wider outer width;  
 wherein when the EMI clip is installed onto the mounting surface, the EMI clip is elastically stretched to insert the enlarged ends of the EMI clip through the wider outer width of the corresponding mounting hole apertures; and  
 wherein once the EMI clip is installed onto the mounting surface, the enlarged portions of the EMI clip contract to a position under the narrow inner width of the corresponding mounting hole apertures thereby captively retaining the EMI clip.  
 
     
     
         17 . The EMI clip retaining system of  claim 16  wherein: 
 the mounting hole apertures are positioned so that the narrow inner widths of the apertures are approximately the same distance apart as are the insides of the acute bends in the EMI clip; and  
 wherein the wider outer widths of the apertures are not so far as to induce plastic deformation of the EMI clip as it is stretched during installation.  
 
     
     
         18 . The EMI clip retaining system of  claim 16  wherein: 
 the mounting hole apertures are positioned so that the narrow inner widths of the apertures are a larger distance apart than the insides of the acute bends in the EMI clip so as to create an interference contact between the EMI clip and the mounting surface; and  
 wherein the wider outer widths of the apertures are not so far as to induce plastic deformation of the EMI clip as it is stretched during installation.  
 
     
     
         19 . The EMI clip retaining system of  claim 18  wherein: 
 the mounting surface thickness is approximately twice the thickness of the radii of the acute bends in the EMI clip.  
 
     
     
         20 . The EMI clip retaining system of  claim 19  wherein each EMI clip comprises two enlarged ends and two corresponding mounting hole apertures.