초록 ▼

A lug lid (10) which closes an open head pail (12) has lugs (31) that overlap the annular rim (19) of the pail and which are crimped thereabout to attach the lid to the pail. An annular expansion bead (38) is formed in the lid to enable the lid to expand to relieve some of the increases in internal

A lug lid (10) which closes an open head pail (12) has lugs (31) that overlap the annular rim (19) of the pail and which are crimped thereabout to attach the lid to the pail. An annular expansion bead (38) is formed in the lid to enable the lid to expand to relieve some of the increases in internal pressure which might occur in the container. Sacrificial depressions (46) are formed in the lid (10) adjacent the expansion bead (38) with each sacrificial depression radially aligned with a lid lug (31). The sacrificial depressions selectively weaken the lid to control the formation of wrinkles (47) in the lid in response to increased pressure within the materials container, with such wrinkles being formed in radial alignment with the lugs of the lid, where the connection between the lid (10) and the pail (12) is strongest.

대표청구항 ▼

A lid for a materials container of the type having a pail body with an annular rim formed about its upper end, said lid comprising: a central body portion; an annular connecting channel circumscribed about said central body potion and adapted to engage and seat upon the annular rim of the pail body;

A lid for a materials container of the type having a pail body with an annular rim formed about its upper end, said lid comprising: a central body portion; an annular connecting channel circumscribed about said central body potion and adapted to engage and seat upon the annular rim of the pail body; an annular bead formed in said central body portion concentric with said connecting channel; lid lugs formed in a spaced series about the lid, projecting downwardly from said connecting channel for attaching the lid to the annular rim of the pail body; and sacrificial depressions formed in said central body potion at said annular bead and radially aligned with said lugs, said depressions weakening said lid at positions along said central body portion in radial alignment with said lugs to control the formation of wrinkles resulting from increases in pressure within the materials container.