초록 ▼

The invention contemplates a pressurized container for viscous foods or other viscous products in which the body of the piston includes an axially intermediate flexible circumferential band which lightly contacts or is expandable in the presence of loading pressure exerted by propellant gas. The ban

The invention contemplates a pressurized container for viscous foods or other viscous products in which the body of the piston includes an axially intermediate flexible circumferential band which lightly contacts or is expandable in the presence of loading pressure exerted by propellant gas. The band thus develops light sealing contact with the interior wall surface of the container, and such contact effectively isolates unexpelled product from the gas-pressure side of the piston, regardless of the extent to which product has been expelled.

대표청구항 ▼

In combination, a pressure container comprising an elongate cylindrical body with a closed upper end, dispensing-valve means in said upper end, a piston having a closed upper end and integral body structure extending downwardly within a cylinder spaced from the container wall, said piston including

In combination, a pressure container comprising an elongate cylindrical body with a closed upper end, dispensing-valve means in said upper end, a piston having a closed upper end and integral body structure extending downwardly within a cylinder spaced from the container wall, said piston including a peripherally continuous relatively thin flexible tubular band integrally uniting and axially spacing said upper end from said downwardly extending body structure, said tubular band being of axial extent substantially Exceeding its radial thickness and in light peripherally continuous piston-piloting and sealing contact with the container wall, and said upper end and downwardly extending body structure each being of peripheral extent less than the peripheral extent of the inner wall of said container, whereby a product chamber is defined in the container space between the piston band and the valved end of the container, and pressure-sealing means closing the lower end of said container to define a pressure chamber beneath said piston, and further whereby when said product chamber is loaded with product and the lower end of said container is subjected to a charge of gas under pressure said band will be pressure-loaded in the direction of enhanced sealing contact with the container wall.