| 摘要 |
<p>An open container or cup of a tight material, which cup is collapsible after use and is formed with either a lateral surface sloping outwards and upwards from the bottom towards the opening, or with a straight tubular lateral surface, which by saddle folding of the bottom surface and with a corresponding folding of the cup wall surface into two mainly mirror-congruent halves abutting against each other may be brought into a state for the cup that is in principle plane. The first lateral section of the rim (K) of the open cup between the points (M, N) has a permanently reinforced shape which preferably consists of a turn-down or solid bead, while the second lateral section and its rim (L) in the open position of the cup is distended in an elastic and flexible arch, the strength of which along the sections of the rim is reduced at the points (O, P), or the rim may be made without a bead as said secont lateral section in the collapsed state of the cup bears against the first lateral section with an elastic force which approximately corresponds to the elastic force in the distended arch (L) of the lateral section in the open position of the cup.</p> |
