| 摘要 |
Various constructions of drinks cans are described, having a partition (5) through which a passage means is produced or defined by an axially displaceable plunger (8). Figures 1 and 2 show cans in which plunger (8) has a fluted wedge-shaped portion (12) which jams in the partition wall to define a series of passages between the flutes when the initially convex-outwards base (7) is popped to the concave-outward position (7'). Figure 2 shows a modified form of poppable base (7). Figure 3 shows a piercing plunger provided with an axial passage (16) and transverse port (17) to provide a passage between the two chambers (6, 13) of the can when the plunger has been pushed through the partition (5). Figures 4 and 5 show plungers which permanently penetrate the partition wall and are relieved (at 18, 20) to define a passage connecting the can chambers on axial displacement of the plunger from a sealing condition. |
