Tank cap for a fuel tank

Abstract

In order to make available a tank cap with a sealing plug ( 13, 15; 18, 21 ) and a filler opening ( 10 ) in the fuel tank, which allows a simplified production and a more flexible use, it is proposed that the filler opening ( 10 ) is configured in such a way that the filler opening ( 10 ) allows the fixing of a sealing plug ( 13, 15; 18, 21 ) by means of two fixing systems or more.

1 . A tank cap with a sealing plug ( 13 ,  15 ;  18 ,  21 ) and a filler opening ( 10 ) in the fuel tank, characterized in that the filler opening ( 10 ) is configured in such a way that the filler opening ( 10 ) allows the fixing of a sealing plug ( 13 ,  15 ;  18 ,  21 ) by means of two fixing systems or more.  
     
     
         2 . A tank cap according to  claim 1 , characterized in that the inner side of the filler opening ( 10 ) has an internal screw thread ( 11 ) and that the filler opening ( 10 ) allows the fixing of a sealing plug ( 13 ) with an external thread ( 14 ) as well as of sealing plugs ( 15 ) of other fixing types.  
     
     
         3 . A tank cap according to  claim 2 , characterized in that the filler opening ( 10 ) has an internal screw thread ( 11 ) which has at least one axially running recess ( 12 ).  
     
     
         4 . A tank cap according to  claim 3 , characterized in that the internal screw thread ( 11 ) of the filler opening ( 10 ) shows three axially runnning recesses ( 12 ) preferably evenly distributed on the periphery.  
     
     
         5 . A tank cap according to any of the  claims 2  to  4 , characterized in that the last turn of the internal screw thread ( 11 ) of the filler opening ( 10 ) axially turned to the tank inner space has another pitch than the remaining turns.  
     
     
         6 . A tank cap according to any of the  claims 2  to  5 , characterized in that the sealing plug ( 15 ) has projections ( 17 ), the position of which on the periphery of the outer side of the sealing plug corresponds to the position of the recesses ( 12 ) in the internal screw thread ( 11 ) of the filler opening ( 10 ).  
     
     
         7 . A tank cap according to  claim 6 , characterized in that the upper side ( 16 ) of the projections ( 17 ) opposite to the tank inner space runs along a helical line about the axis of the sealing plug ( 15 ), the pitch of which corresponds to the pitch of the internal screw thread ( 11 ) on the filler opening.  
     
     
         8 . A tank cap according to any of the  claims 2  to  7 , characterized in that the sealing plug ( 18 ) has at its end turned to the tank inner space radially telescoping legs ( 20 ) which can grasp behind the filler opening.  
     
     
         9 . A tank cap according to at least one of the  claims 2  to  8 , characterized in that the sealing plug ( 21 ) has a radially expandable elastic section ( 25 ) which can be applied under pressure to the inner wall of the filler opening, when the sealing plug is inserted.  
     
     
         10 . A tank cap according to  claim 9 , characterized in that the sealing plug ( 21 ) has an articulated lever ( 22 ) by means of which the first end ( 26 ) of the sealing plug turned to the tank inner space can be pushed axially in direction of the second end ( 24 ) of the sealing plug turned to the tank outer space, an elastic element ( 25 ) situated between both said ends ( 24 ,  26 ) being axially compressed and radially pushed outward.