| 摘要 |
<p>A molded plastic pail has a pair of continuous annular flanges molded integrally on its outer wall extending radially outwardly and defining between them a free, continuous channel of constant cross-section extending around the entire circumference of the pail. The flanges facilitate the handling of the filled pails on automatic handling apparatus having grab fingers which can engage in the channel between the flanges without disturbing the lid of the pail. The inner surface of the downwardly-depending rim of the lid is formed with a series of axially-extending grooves which, when the lid is applied over the container, define venting spaces between the lid and the outer side of an outwardly-turned bead on the upper edge of the container, thus relieving the pressure of air trapped under the lid as it is applied over the mouth of the container. The underside of the lid has a downwardly-depending annular flange defining with the rim of the lid a downwardly-opening channel for receiving a sealing gasket or the like. The lid has a downwardly-depressed central portion for receiving the base of a container when a number of containers are stacked one on another. Reinforcing ribs extend radially between the downwardly-depending flange and the downwardly-depressed portion and have their lower edges inclining upwardly and inwardly to provide a greater reinforcement of the lid against deflection under axial load with savings in the quantity of molding plastic consumed.</p> |
