Dispenser with internal diaphragm

摘要

PCT No. PCT/AU92/00604 Sec. 371 Date May 25, 1994 Sec. 102(e) Date May 25, 1994 PCT Filed Nov. 11, 1992 PCT Pub. No. WO93/11059 PCT Pub. Date Jun. 10, 1993A dispenser is disclosed which includes a container having a base, a cylindrical side wall and a lid. A piston is arranged within the container between component and an air space between the piton and lid. A diaphragm is arranged within the air space and is sealed to the container between a rim of the container and a rim of the lid so that an enclosed volume is defined between the diaphragm and the lid. A rod extending between the base and lid and passing through the piston and diaphragm is provided to reinforce the container. The lid includes an air inlet for allowing compressed air to enter the enclosed volume to expand the diaphragm to thereby move the piston to dispense the component from the dispenser. In a further embodiment the diaphragm is replaced by an air bag located within the air space and bearing against the piston and lid.