Dispenser for discharge of liquid to pasty materials

Abstract

The invention relates to a dispenser ( 1 ) for discharging liquid to pasty materials. The dispenser comprises a pump head ( 2 ) and a pump chamber ( 8 ) which is embodied therein and is provided with a pump chamber wall ( 20 ), an inlet valve ( 26 ) and a discharge valve ( 11 ). The dispenser ( 1 ) further comprises a reservoir ( 3 ) which contains a storage bag ( 4 ) whose volume can be reduced so as to empty the same. In order to obtain an advantageous design regarding vibrations or sudden pressure increases in the material, the pump chamber wall ( 20 ) of the pump head ( 2 ) is configured in a flexible manner.

1 - 9 . (canceled) 
   
   
       10 . Dispenser ( 1 ) for discharge of liquid to pasty materials, comprising a pump head ( 2 ) and a pump chamber ( 8 ) formed in the pump head, the pump chamber having a pump chamber wall ( 20 ) and an inlet valve ( 26 ) and an outlet valve ( 11 ), and the dispenser comprising a storage container ( 3 ), a storage bag ( 4 ) which can be reduced in volume for emptying purposes being contained in the storage container ( 3 ), wherein the pump chamber wall ( 20 ) of the pump head ( 2 ) is formed to be flexible, wherein the internal bag is connected in the base region of the storage container ( 3 ) to the base, pointwise or along a line, so that turning inside-out of the internal bag ( 4 ) is prevented, and wherein the internal bag ( 4 ) is secured to the storage container ( 3 ) in the neck region of the container. 
   
   
       11 . Dispenser according to  claim 10 , wherein the pump chamber wall ( 20 ) is formed by a pump chamber bellows of plastics material. 
   
   
       12 . Dispenser according to  claim 10 , wherein the pump chamber wall ( 20 ) replaces, on account of its elastic restoring force, a return spring which would otherwise be required. 
   
   
       13 . Dispenser according to  claim 10 , wherein the inlet valve ( 26 ) is biased into its closed position. 
   
   
       14 . Dispenser according to  claim 10 , wherein the inlet valve ( 26 ) is formed from an elastic plastics material. 
   
   
       15 . Dispenser according to  claim 10 , wherein the outlet valve ( 11 ) is biased into its closed position. 
   
   
       16 . Dispenser according to  claim 10 , wherein the outlet valve ( 11 ) is formed of a plastics material having elastically restoring properties. 
   
   
       17 . Dispenser according to  claim 14 , wherein the inlet valve ( 26 ) has a bridge portion ( 9 ) of soft plastics material, the bridge portion being biased into its closed position. 
   
   
       18 . Dispenser according to  claim 17 , wherein the bridge portion ( 9 ) of soft plastics material is formed integrally with the material of the pump chamber wall ( 20 ).