Abstract: An apparatus for pressure testing a can body. The apparatus includes a housing having a pivotable cover and an empty can with the lid attached is placed in a cradle in the housing. As the cover is moved to the closed position, a hollow needle, operably connected to the cover, is automatically inserted through the wall of the can body. On locking of the cover in the closed position, an electric circuit can be established to introduce gas under pressure through the needle into the can body. A readout of the pressure required to bulge the can body is given, thereby indicating whether the can body meets manufacturing specifications.

Abstract: A one-piece metal can body having a cylindrical side wall and an integral bottom wall. The bottom wall is disposed in a plane normal to the axis of the cylindrical side wall and is formed with one or more outwardly extending depressions which are arranged in circular configuration and are spaced radially inwardly from the peripheral edge of the bottom wall. Under unpressurized conditions the can body rests on the depressions, and when the can body is subjected to internal pressure, the bottom wall will deform outwardly in a uniform and predictable manner and the can body will remain supported by the depressions.

Abstract: An apparatus for forming an inward dome in the bottom wall of a metal can body having a beveled peripheral edge bordering the bottom wall. The apparatus includes a housing which supports a convex die member adapted to engage the bottom wall of the can body to form the dome. A pressure ring is disposed radially outward of the die member and is mounted for sliding movement with respect to the die member. The pressure ring is provided with a beveled surface which is adapted to be engaged by the beveled edge of the can body to prevent deformation of the bevelled edge as the dome is formed in the bottom wall. The pressure ring is connected to an air spring which provides uniform resistance to movement of the ring relative to the die member. In addition, the housing and die member are connected through a second air spring to a fixed support and after the dome has been formed, continued axial movement of the can body will result in compression of the second air spring to insure full formation of the dome.

Abstract: A lid construction for a pressurized beverage container. The lid has a pouring opening which is normally closed by a generally pointed tab that is integrally connected to the lid by a hinge section. The peripheral edge of the tab underlies the edge of the lid bordering the opening, and a strip of sealing material is applied to the underside of the lid and seals the joint between the tab and the lid. The sealing strip can be provided with a weakened zone or line located in spaced relation to the joint. To open the container, the consumer presses downwardly on the tab and the pointed tip of the tab will rupture the sealing strip and continued downward force will move the tab to the open position to expose the contents of the container.

Abstract: A spin flanging machine for flanging the open end of container bodies, such as metal cans. The machine includes a drive shaft mounted for rotation on a supporting structure and a rotary turret is secured to the shaft and carries a series of flanging heads. Each head is provided with a plurality of flanging rollers which are adapted to engage the open end of the can. As the turret rotates, each head is rotated about its axis by the driving engagement of a pinion connected to the head shaft with a large fixed gear mounted on the supporting structure. The flanging heads are moved in a reciprocating manner towards and away from the can by a cam mechanism including a cam follower that is secured to the end of each head and engages a cam groove on the fixed supporting structure.

Abstract: A spin flanging machine for flanging the open end of container bodies, such as metal cans. The machine includes a drive shaft mounted for rotation on a supporting structure and a rotary turret is secured to the shaft and carries a series of flanging heads. Each head is provided with a plurality of flanging rollers which are adapted to engage the open end of the can. As the turret rotates, each head is rotated about its axis by the driving engagement of a pinion connected to the head shaft with a large fixed gear mounted on the supporting structure. The flanging heads are moved in a reciprocating manner towards and away from the can by a cam mechanism including a cam follower that is secured to the end of each head and engages a cam groove on the fixed supporting structure.