Self-closing cap

Abstract

A sealing lid assembly used in connection with a service port, the sealing lid assembly including a cap; a plug extending from an underside of the cap and at least partially receivable in the service port, a first seal supported on the plug and extending radially outward therefrom to sealingly engage the service port when the cap is in a closed position; and a biasing assembly adapted to urge the cap toward the closed position.

1 . A sealing lid assembly used in connection with a service port, the sealing lid assembly comprising:
 a cap adapted to overlie the service port in a closed position;   a plug extending axially inward from said cap, wherein said plugs tapers radially inwardly as it extends axially inwardly from said cap to form a frusto-conical wall terminating at an inward end;   wherein said plug defines an annular recess between said cap and said inward end;   a first seal received within said annular recess and extending radially outward therefrom to sealingly engage the service port when said cap is in said closed position;   wherein said cap extends radially outward of said plug to form an annular flange adapted to engage the outer extremity of the service port;   a second seal having a circular shape attached to said annular flange and interposed between said flange and the outer extremity of the service port to create sealing engagement between said cap and the service port;   a first and second arm extending outwardly from one end of said cap, said first and second arm each defining a pin receiver aligned along a common axis;   a pin received in said pin receivers and supported adjacent the service port, wherein said cap pivots on said pin;   a spring supported on said pin and contacting said cap to bias said cap toward said closed position.   
     
     
         2 . The sealing lid assembly of  claim 1 , wherein said cap defines a vent assembly selectively opening the service port to atmosphere. 
     
     
         3 . A sealing lid assembly used in connection with a service port, the sealing lid assembly comprising:
 a cap;   a plug extending from an underside of said cap terminating at an inward end, said plug having an annular recess between said cap and said inward end;   a first seal received within said annular recess and extending radially outward therefrom to form a seal when said cap is in a closed position; and   a biasing assembly adapted to urge said cap toward said closed position.   
     
     
         4 . The scaling lid assembly of  claim 3 , wherein said cap extends radially outward of said plug to form an annular flange; and
 a second seal having an annular shape attached to said annular flange located radially outward of said plug.   
     
     
         5 . The sealing lid assembly of  claim 3  further comprising:
 a first and second arm extending outwardly from one end of said cap, said first and second arm each defining a pin receiver aligned along a common axis; 
 a pin received in said pin receivers and supported adjacent the service port, wherein said cap pivots on said pin; and 
 wherein said biasing assembly includes a spring supported on said pin and contacting said cap to bias said cap toward said closed position. 
 
     
     
         6 . The sealing lid assembly of  claim 2 , wherein said plug tapers radially inwardly as it extends axially inwardly from said cap to form a frusto-conical wall. 
     
     
         7 . The sealing lid assembly of  claim 3  further comprising a vent assembly supported on said cap and adapted to selectively open the service port to atmosphere for venting of gas or vapor. 
     
     
         8 . The sealing lid assembly of  claim 3  further comprising a service port adapter including a collar attachable to the service port and a wall extending upwardly from said collar defining a bore that communicates with the service port; wherein said plug is received in said bore and said first seal engages said wall in the closed position, and wherein said biasing assembly is supported on said service port adapter. 
     
     
         9 . The sealing lid assembly of  claim 8  further comprising a mounting bracket extending outwardly from said service port adapter; a pin supported on said mounting bracket; wherein said cap is pivotally supported on said pin and said biasing assembly includes a torsion spring having a first tab received in a spring recess formed in said mounting bracket and a second tab operatively connected to said cap to apply a biasing force adapted to urge said cap toward the closed position. 
     
     
         10 . The sealing lid assembly of  claim 8  further comprising a second seal supported on said cap and located radially outward of said plug; said second seal sealingly engaging an outer extremity of said wall when said cap is in the closed position. 
     
     
         11 . The sealing lid assembly of  claim 10  wherein said collar includes threads adapted to engage corresponding threads on the service port. 
     
     
         12 . The sealing lid assembly of  claim 8 , wherein said service port adaptor further comprises an insert extending axially inward from said collar and terminating at a tip, said tip of said insert being at least partially receivable within said service port; said insert defining an insert bore that communicates with said bore defined by said collar and said service port allowing fluid to pass therethrough, said tip of said insert forming a magnet housing located adjacent to said bore; and a magnet housed in said magnet housing adjacent to said bore. 
     
     
         13 . A combination tank and sealing lid assembly, the tank comprising a service port extending outward from said tank and defining an opening for receiving a diesel emissions fluid;
 the sealing lid assembly comprising a service port adaptor having a collar that attaches to the service port and defines a bore that communicates with said opening, said collar including an upstanding wall that surrounds the opening;   a cap pivotally attached to said collar and adapted to overlie the upstanding wall in a closed position;   a plug extending axially inward from said cap, said plug having a diameter corresponding to the opening such that said plug is at least partially received in the opening, wherein said plug defines an annular recess between said cap and said inward end;   a first seal received within said annular recess and extending radially outward therefrom to sealingly engage an inner surface of the upstanding wall when said cap is in said closed position;   wherein said cap extends radially outward of said plug to form an annular flange adapted to engage an outer extremity of the upstanding wall;   a second seal attached to said annular flange and interposed between said flange and the outer extremity of the upstanding wall to create sealing engagement between said cap and the upstanding wall when said cap is in said closed position; and   a biasing assembly supported on said service port adapter and engagable with said cap to urge said cap toward the closed position.   
     
     
         14 . The sealing lid assembly of  claim 13 , wherein said plug tapers radially inward as it extends axially inward. 
     
     
         15 . The sealing lid assembly of  claim 13 , wherein said cap includes a vent assembly having a valve providing selective fluid communication between the service port and atmosphere.