Method of and apparatus for pressure charging aerosol dispensers with push buttons attached

Claim 1

THE METHOD OF CHARGING WITH A PROPELLANT AN AEROSOL CAN HAVING A SELF CONTAINED OUTLET VALVE PROVIDED WITH A TUBULAR VALVE STEM HAVING THEREON A VALVE OPERATING PUSH BUTTON WITH FLUID DISCHARGE PASSAGES THERETHROUGH, WHICH METHOD COMPRISES THE FOLLOWING STEPS, VIZ.: ENCLOSING THE ASSEMBLED PUSH BUTTON, VALVE STEM AND A PORTION OF THE CAN SURROUNDING THE VALVE STEM WITHIN A HERMETICALLY SEALED CHAMBER, APPLYING MECHANICAL PRESSURE TO THE PUSH BUTTON TO UNSEAL THE VALVE OF THE CAN, ADMITTING PROPELLANT UNDER PRESSURE INTO THE SEALED CHAMBER TO FLOW FROM SAID CHAMBER THROUGH THE FLUID DISCHARGE PASSAGES OF THE PUSH BUTTON AND THROUGH THE TUBULAR VALVE STEM INTO THE INTERIOR OF THE CAN TO CHARGE THE LATTER, THEREAFTER RELIEVING THE PRESSURE ON THE PUSH BUTTON TO PERMIT THE VALVE OF THE CAN TO SEAL THE CHARGED CAN, SHUTTING OFF THE FEED OF PROPELLANT TO THE SEALED CHAMBER, THEREAFTER UNSEALING SUCH CHAMBER, AND REMOVING THE RESULTING CHARGED CAN FROM COOPERATIVE RELATION WITH SAID CHAMBER, WHEREBY THE CAN IS CHARGED WITH PROPELLANT WHILE THE VALVE OPERATING BUTTON THEREOF REMAINS IN INTACT CONDITION THEREON THROUGHOUT THE CHARGING OPERATION.