Safety cover

Abstract

A safety cover comprises an inner plug and an outer cover. The coupling portions of the inner plug and outer cover are alternatively arranged with stopper and ribs. The inner surfaces of the limiting stoppers coupling to the ribs are inclined. When the ribs of the inner plug are separated from the limiting stoppers of the outer cover, the inner plug dose not rotate with the rotation of the outer cover. When the user presses the outer cover slightly, so that the buckle ring of the outer cover is embedded into the annular flange of the inner plug, the stopper ribs of the outer cover exactly slide along the limiting stoppers of the inclined surface of the inner plug to buckle the limiting stoppers. Thereby, the stopper ribs of the outer cover resist against the limiting stoppers of the inner plug to rotate therewith.

What is claimed is:  
     
         1 . A safety cover comprising an inner plug and an outer cover locked to a periphery of the inner plug; wherein 
 a portion of the inner plug resisting against the outer cover having a plurality of ribs which are arranged around a circle; a top surface of the inner plug has an annular groove; a center of the annular groove is installed with a buckle portion which is inserted into an inner top groove of the outer cover;    the outer cover has an annular flange buckled with a buckling ring of the inner plug; a portion at a top inner surface of the outer cover has a configuration corresponding to the ribs of the inner plug;    a plurality of limiting stoppers are arranged around a whole inner surface of the outer cover; each of an inner surface of each limiting stopper coupled to a respective rib of the inner plug is an inclined surface; a portion of the outer cover corresponding to the buckle portion of the inner plug is installed with a protruding annular ring for confining the buckled portion;    wherein, when the ribs of the inner plug are separated from the limiting stoppers of the outer cover, the inner plug dose not rotate with the rotation of the outer cover; when the user presses the outer cover slightly, so that the buckle ring of the outer cover is embedded into the annular flange of the inner plug, the stopper ribs of the outer cover exactly slide along the limiting stoppers of the inclined surface of the inner plug to buckle the limiting stoppers; thereby, the stopper ribs of the outer cover resist against the limiting stoppers of the inner plug to rotate therewith.    
     
     
         2 . The safety cover as claim in  claim 1 , wherein an annular surface of the inner plug is protruded with a buckling ring which is engagable with the outer cover.  
     
     
         3 . The safety cover as claim in  claim 1 , wherein a top inner surface of the outer cover aligned to the limiting stopper of the inner plug has an annular stopping rib; an inner surface of the outer cover has an annular groove; a center of the annular groove is concave so as to form a buckle ring; the inner plug has an annular limiting stoppers which are arranged along a circle; an inner surface of each limiting stopper is formed as an inclined surface; the buckle ring of the inner plug coupled to the outer cover is installed with an annular flange for receiving the buckle ring.