Closure device for a vessel holding an operating medium

Abstract

A closure device for a vessel for holding an operating medium includes a tank closure ( 2 ) and a tank stub ( 1 ). The tank stub ( 1 ) defines a fill opening having a sealing surface ( 16 ) disposed therearound. The tank closure ( 2 ) includes an outer part ( 6 ) and an inner part ( 8 ) which are limitedly movable toward one another in the axial direction of the tank stub ( 1 ). The inner part ( 8 ) does not rotate but is guided axially displaceably in the tank stub ( 1 ) and the outer part ( 6 ) is rotatable relative to the inner part ( 8 ) on the tank stub ( 1 ) so as to be fix-tightly screwable thereon. A spring ( 26 ) is provided between the outer part ( 6 ) and the inner part ( 8 ). The spring biases the inner part ( 8 ) against the sealing surface ( 16 ) on the tank stub ( 1 ).

What is claimed is: 
     
         1 . A closure device for a vessel for holding an operating medium, the closure device comprising:
 a tank closure having an inner part and an outer part;   a tank stub defining a fill opening and a sealing surface surrounding said fill opening;   said inner part and said outer part being limitedly movable toward each other in the axial direction of said tank stub;   said inner part being rotatably fixed but axially displaceably guided on said tank stub;   said outer part being rotatable relative to said inner part so as to be fix-tightly screwable on said tank stub; and,   a spring arranged between said inner part and said outer part, so as to bias said inner part against said sealing surface of said tank stub.   
     
     
         2 . The closure device of  claim 1 , wherein said tank stub defines a longitudinal direction and has at least one slot running longitudinally in said direction and said inner part has at least one radial projection arranged thereon and displaceably guided in said slot. 
     
     
         3 . The closure device of  claim 2 , wherein said radial projection is configured as a rib in the longitudinal direction of said inner part; and, said rib has a width which is less than the width of said slot. 
     
     
         4 . The closure device of  claim 2 , wherein said slot has an end adjacent to said fill opening; and, said slot has a lead-in cone arranged at said end thereof. 
     
     
         5 . The closure device of  claim 3 , wherein said tank stub has four of said slots evenly spaced over the circumference of said tank stub; and, said inner part has two of said ribs arranged diametrically thereon. 
     
     
         6 . The closure device of  claim 1 , wherein said inner part has an opening formed therein and a shoulder formed thereon; said inner part has an interior and at least one arm arranged within said interior; and, said arm runs in the longitudinal direction of said tank stub and extends through said opening and has a latch hook latching behind said shoulder. 
     
     
         7 . The closure device of  claim 1 , wherein said slots are arranged inside on said tank stub. 
     
     
         8 . The closure device of  claim 1 , wherein said slots are arranged outside on said tank stub. 
     
     
         9 . The closure device of  claim 1 , wherein said inner part has an end adjacent said outer part; said inner part has a flange formed thereon at said end thereof; and, said flange is movable toward said sealing surface of said tank stub. 
     
     
         10 . The closure device of  claim 9 , further comprising a sealing ring arranged on said flange; said sealing ring being configured to be pressable against said sealing surface; and, said sealing surface being a radial surface. 
     
     
         11 . The closure device of  claim 1 , wherein said outer part is configured to fix-tightly screw onto said tank stub via a non-self-tightening thread. 
     
     
         12 . The closure device of  claim 1 , wherein said outer part is configured to fix-tightly screw onto said tank stub via a bayonet coupling. 
     
     
         13 . The closure device of  claim 11 , wherein said tank stub has a neck portion having an outer thread formed thereon running in the peripheral direction. 
     
     
         14 . The closure device of  claim 11 , wherein said tank stub has a neck portion having at least one bayonet rib running in the peripheral direction. 
     
     
         15 . The closure device of  claim 13 , wherein said outer part has an axial section which surrounds said neck portion and said outer part has radially inward facing first projections for engaging said outer thread. 
     
     
         16 . The closure device of  claim 15 , wherein said projections are formed by three noses having upper and/or lower edges corresponding to the pitch of said thread. 
     
     
         17 . The closure device of  claim 16 , wherein said outer thread has an upper edge; a projection is arranged in said outer thread at said upper edge; and, at least one of said noses is configured to fully engage behind said projection in said outer thread when said outer part is fully screwed onto said tank stub. 
     
     
         18 . The closure device of  claim 15 , further comprising a flange arranged on said tank stub; and, said axial section coming close to said flange when said tank stub is fully attached. 
     
     
         19 . The closure device of  claim 1 , wherein said inner part is a hollow body having an end facing away from said outer part; and, said hollow body has a base on said end facing away from said outer part and said base closes off said hollow body. 
     
     
         20 . The closure device of  claim 19 , wherein said hollow body of said inner part has a guide part accommodated therein which, on the one hand, rests on said inner part and, on the other hand, is supported on said base of said inner part via said spring. 
     
     
         21 . The closure device of  claim 20 , wherein said inner part has a centric guide section arranged thereon; said guide part has a centric opening running in the longitudinal direction; and, said guide part is slideably displaceably journalled on said guide section. 
     
     
         22 . The closure device of  claim 21 , wherein said spring is a helical compression spring, which is supported by a radial collar of said guide part and surrounds said guide part and said guide section.