Bag for use in gas can

Abstract

A gas-containing apparatus includes a can, a bag and a cover. The bag is installed in the can. The bag includes a tube formed thereon and with an internal side and an external side, a thread formed on the external side of the tube and a boss formed on the external side of the tube. The cover is mounted on the can. The cover includes a valve with an external side and an internal side, a thread formed on the internal side of the valve for engagement with the thread of the bag and a recess defined in the valve for receiving the boss, thus avoiding rotation of the tube relative to the valve.

What is claimed is:  
     
         1 . A gas-containing apparatus includes: 
 a can;    a bag installed in the can, the bag including a tube formed thereon and with an internal side and an external side, a thread formed on the external side of the tube and a boss formed on the external side of the tube; and    a cover mounted on the can, the cover including a valve with an external side and an internal side, a thread formed on the internal side of the valve for engagement with the thread of the bag and a recess defined in the valve for receiving the boss, thus avoiding rotation of the tube relative to the valve.    
     
     
         2 . The gas-containing apparatus according to  claim 1  wherein the boss includes an inclined side for facilitating the boss entering the recess in a direction and an upright side for avoiding the boss escaping the recess in an opposite direction.  
     
     
         3 . The gas-containing apparatus according to  claim 1  wherein the can includes an upper rim, and the cover includes a rim for engagement with the upper rim of the can.  
     
     
         4 . The gas-containing apparatus according to  claim 3  including a seal installed between the upper rim of the can and the rim of the cover.  
     
     
         5 . A gas-containing apparatus includes: 
 a can;    a bag installed in the can, the bag including a tube formed thereon and with an internal side and an external side, a thread formed on the external side of the tube and a recess defined in the tube; and    a cover mounted on the can, the cover including a valve with an external side and an internal side, a thread formed on the internal side of the valve for engagement with the thread of the bag and a boss formed on the valve for insertion in the recess, thus avoiding rotation of the tube relative to the valve.    
     
     
         6 . The gas-containing apparatus according to  claim 5  wherein the boss includes an inclined side for facilitating the boss entering the recess in a direction and an upright side for avoiding the boss escaping the recess in an opposite direction.  
     
     
         7 . The gas-containing apparatus according to  claim 5  wherein the can includes an upper rim, and the cover includes a rim for engagement with the upper rim of the can.  
     
     
         8 . The gas-containing apparatus according to  claim 7  including a seal installed between the upper rim of the can and the rim of the cover.