Lug lid for materials container with sacrificial depressions and annular expansion bead

In a materials container of the type having a pail body with an annular rim formed about an open end thereof suitable for receiving and containing flowable materials, the improvement therein comprising:

• a lid adapted to fit over and seat upon the annular rim of the pail body and having a central body portion and an outer edge with lid lugs formed at spaced intervals about said outer edge for engaging the annular rim of the pail body in crimping engagement to mount said lid against the pail body;
• an annular expansion bead formed within said lid internally of said lid lugs and adapted to enable said lid to deform and expand in response to increases in pressure within the materials container;
• and
• a series of sacrificial dimples formed in said lid at said annular expansion bead, each of said dimples being radially aligned with a lid lug, said dimples weakening the lid at positions along said annular expansion bead which are radially aligned with said lugs to control the formation of wrinkles within said lid so that such wrinkles are formed in alignment with said lid lugs.

A materials container for the storage and transport of flowable material comprising:

• a pail body having a side wall and an annular rim forming an open end of said pail body;
• a circular lid adapted to engage and seat upon said annular rim of said pail body to close said open end of said pail body, said lid having at its edge portion a series of lugs circumferentially formed in spaced series about said lid for securing said lid in sealing engagement to said annular rim of said pail body;
• an annular expansion bead formed in said lid radially inwardly of said lugs and concentric with respect to said lid lugs to enable said lid to deform and expand the space in said materials container as pressure of the materials within said materials container increases to substantially relieve such pressure without disturbing the sealing engagement between said lid and said pail body;
• and
• means for controlling the deformation of said lid in response to increases in pressure within said materials container to form wrinkles in said lid that become radially aligned with the lugs of the lid.

A container for storing an shipping of flowable materials comprising:

• a pail including a bottom wall and a substantially cylindrical sidewall, an annular rim forming an open end of said pail at its end opposite said bottom wall;
• a lid for mounting to said rim and sealing said pail, said lid comprising:
• a central body portion and a perimeter portion;
• said perimeter portion including an annular connecting channel for surrounding said central body portion and sized and shaped for mounting on said rim;
• a series of lugs extending about said perimeter portion for clinching about said annular rim of said pail for holding said lid in closed relationship with respect to said rim of said pail;
• an annular expansion bead formed in said lid concentrically inwardly of said annular connecting channel;
• and
• means for controlling the formation of wrinkles in the lid in response to an increase in pressure within said container so that the wrinkles extend generally radially from said central body portion toward said lugs of the perimeter portion.