Closure for a filler neck having a seal

Abstract

A closure stopper having a seal for a filler neck has first locking faces and a first sealing face, and the closure stopper has second locking faces and a second sealing face. The functions of the sealing ring and of the locking device are not impaired by the effects of temperature because (a) the smallest radius of the first sealing face is larger than the largest radius of the second sealing face, and (b) the sealing ring is a resilient circular ring with a first and a second sealing surface, of which, when the closure stopper is inserted, one surface bears against the first sealing face and the other face bears against the second sealing face. The sealing ring has a core made of resilient steel.

1 . A closure stopper having a seal for a filler neck which has first locking faces and a first sealing face, and which closure stopper has second locking faces and a second sealing face, a sealing ring being arranged between the first and the second sealing face, wherein 
 a) the largest radius of the first sealing face is smaller than the smallest radius of the second sealing face or the smallest radius of the first sealing face is larger than the largest radius of the second sealing face,    b) the sealing ring is a resilient circular ring having a first and a second sealing surface, of which, when the closure stopper is inserted, one surface bears against the first sealing face and the other face bears against the second sealing face.    
     
     
         2 . The closure stopper as claimed in  claim 1 , wherein the sealing ring comprises a metallic core and a covering made of an elastomer which forms the sealing surfaces.  
     
     
         3 . The closure stopper as claimed in  claim 2 , wherein the metallic core is an essentially planar spring ring.  
     
     
         4 . The closure stopper as claimed in  claim 1 , wherein the sealing surfaces have thickened areas at least on one of the radii corresponding to their associated sealing faces.  
     
     
         5 . The closure stopper as claimed in  claim 3 , wherein one of the sealing faces is adjoined by a conical stop face which lies opposite the other sealing face.  
     
     
         6 . The closure stopper as claimed in  claim 1 , wherein a single sensor is fitted on the filler neck and a magnet is fitted at a point on the circumference of the closure stopper.  
     
     
         7 . The closure stopper as claimed in  claim 6 , wherein the magnet is a magnet segment which extends over an angular range of 30 to 60 degrees.