Device for delivering a gas

Abstract

In a device (P) for delivering a gas out of a pressure chamber ( 5 ), in particular into a container ( 17 ) for dispensing a sealant ( 15 ) from said container into a tire ( 18 ) of a vehicle and/or for inflating the tire, wherein a plunger ( 4 ) is arranged to be oscillatingly movable in the pressure chamber, a gasket ( 20 ) is associated with the plunger and changes the distance thereof from a pressure chamber wall ( 28 ) when there is a change in the direction of movement of the plunger.

1 . A device (P) for delivering a gas from a pressure chamber ( 5 ) into a container ( 17 ) for dispensing a sealant ( 15 ) from this container into a tire ( 18 ) of a vehicle and/or for inflating the tire, comprising a piston ( 4 ) arranged in a pressure chamber ( 5 ) and movable in an oscillatory fashion, including a gasket ( 20 ) associated with the piston ( 4 ), wherein the gasket changes the distance thereof from a pressure-chamber wall ( 28 ) of the pressure chamber ( 5 ) when the movement direction of the piston ( 4 ) changes. 
     
     
         2 . A device (P) for delivering a gas from a pressure chamber ( 5 ) into a container ( 17 ) for dispensing a sealant ( 15 ) from this container into a tire ( 18 ) of a vehicle and/or for inflating the tire, comprising a piston ( 4 ) arranged in a pressure chamber ( 5 ) and movable in an oscillatory fashion, including a gear element ( 3 ) associated with the piston ( 4 ), wherein the gear element converts a rotational motion of a drive shaft ( 2 ) of a drive ( 1 ) into an oscillatory motion. 
     
     
         3 . The device as claimed in  claim 2 , wherein the piston ( 4 ) is arranged between the gear element ( 3 ) and a force-storage element ( 6 ) which holds the piston ( 4 ) under pretension against the gear element ( 3 ). 
     
     
         4 . The device as claimed in  claim 2 , wherein the gear element is a cam ( 3 ) with at least one projection ( 3 . 1 / 3 . 2 ). 
     
     
         5 . The device as claimed in  claim 4 , wherein the cam is a double cam ( 3 ) with two projections ( 3 . 1 ,  3 . 2 ). 
     
     
         6 . The device as claimed in  claim 5 , wherein the double cam ( 3 ) has an elliptical cross section. 
     
     
         7 . The device as claimed in  claim 2 , wherein the force-storage element is arranged between a cover wall ( 29 ) of the pressure chamber ( 5 ), and a piston end face ( 26 ) of the piston ( 4 ), wherein the cover wall is formed with an outlet ( 9 ). 
     
     
         8 . The device as claimed in  claim 7 , wherein the force-storage element ( 6  is arranged in a pocket ( 7 ) formed in the piston end face ( 26 ) of the piston ( 4 ), and is braced against the cover wall ( 29 ) of the pressure chamber ( 5 ), in which cover wall the outlet ( 9 ) is formed. 
     
     
         9 . The device as claimed in  claim 8 , wherein the force-storage element is a compression spring ( 6 ). 
     
     
         10 . The device as claimed in  claim 7 , wherein a non-return valve ( 10 ) is associated with the outlet ( 9 ). 
     
     
         11 . The device as claimed in  claim 2 , wherein the pressure chamber ( 5 ) is defined by a pressure-chamber wall ( 28 ) and a pressure-chamber cover wall ( 29 ) which together form a pressure cylinder ( 25 ). 
     
     
         12 . The device as claimed in at  claim 2 , including a drive for the piston which comprises an electric motor ( 1 ). 
     
     
         13 . The device as claimed in  claim 12 , wherein the drive ( 1 ) has an end wall ( 8 ), to which a pressure cylinder ( 25 ) is connected. 
     
     
         14 . The device as claimed in one  claim 1 , wherein the gasket is a gasket ring ( 33 ). 
     
     
         15 . The device as claimed in one  claim 14 , wherein the piston has at least one conical surface ( 32 ). 
     
     
         16 . The device as claimed in  claim 15 , wherein the conical surface ( 32 ) is provided at a groove ( 31 ) in the piston. 
     
     
         17 . The device as claimed in  claim 16 , wherein the gasket ring ( 33 ) is arranged in the groove in the piston such that the gasket ring ( 33 ) runs outward along the conical surface ( 32 ) until it rests against a pressure-chamber wall ( 28 ) of a pressure cylinder in which the piston reciprocates. 
     
     
         18 . The device as claimed in  claim 1 , wherein the gasket is a lip seal ( 20 ). 
     
     
         19 . The device as claimed in  claim 18 , wherein the gasket ( 20 ) and the piston ( 4 ) have an integral design. 
     
     
         20 . The device as claimed in  claim 19 , wherein the gasket ( 20 ) forms a boundary edge ( 24 ) of the piston ( 4 ) to the pressure chamber ( 5 ). 
     
     
         21 . The device as claimed in  claim 20 , wherein a diameter circumscribed by the boundary edge ( 24 ) is greater than an external diameter (A) of a lateral peripheral wall of the piston ( 4 ). 
     
     
         22 . The device as claimed in  claim 20 , wherein the gasket ( 20 ) is delimited by two recesses ( 21 ;  22 ) formed in the piston ( 4 ). 
     
     
         23 . The device as claimed in  claim 22 , wherein one recess ( 21 ) is formed in a piston end face ( 26 ) of the piston ( 4 ) which faces an outlet ( 9 ) of the pressure chamber ( 5 ). 
     
     
         24 . The device as claimed in  claim 23 , wherein another recess ( 22 ) is formed in the lateral peripheral wall of the piston ( 4 ). 
     
     
         25 . The device as claimed in  claim 24 , wherein the cross sections of the recesses ( 21 ,  22 ) are formed as substantially U-shaped channels ( 21 ,  22 ). 
     
     
         26 . The device as claimed in  claim 25 , wherein a side of the U-shaped channels ( 21 ,  22 ) that faces the gasket ( 20 ) has a smaller gradient/curvature than that of the channel ( 21 ,  22 ) facing away from the gasket. 
     
     
         27 . The device as claimed in  claim 20 , wherein the cross section of the gasket ( 20 ) tapers off toward the boundary edge ( 24 ).