Container lid

Claim 2

A lid for a container having a sidewall and a lip protruding radially outwardly from the sidewall and extending about the periphery of the upper end of the container sidewall, the lid being formed from resilient plastic material and comprising: a top wall; a relatively thin sidewall web segment extending downwardly from the periphery of the top wall; a relatively thick skirt integral with and extending downwardly from the lower end of the web, said skirt and web being dimensioned so that the skirt will display a greater resistance to radial expansion than the web; the inner surface of the web defining a greater diameter than the inner surface of the skirt portion, thereby to define an inwardly-facing shoulder, the shoulder being spaced from the underside of the lid top wall by an amount substantially equal to the height of the container lip; whereby the lid may be snap-fitted onto the container; said web being sufficiently thin, and being dimensioned with respect to the container lip so that snap-fitting of the lid onto the container will require the web to stretch heightwise and to deform to and wrap around the outer periphery of the container lip when the shoulder is engaged with the underside of the container lip, said skirt portion being disposed below the container lip and being constructed and arranged as to retain web portion into firm and snug sealing engagement with the container lip.

Claim 3

A lid as defined in claim 1 further comprising: the inner diameter of the skirt being substantially equal to the outer diameter of the container sidewall; and the inner diameter of the web lying within an annulus, the inner diameter of which is greater than the outer diameter of the container sidewall and in which the outer diameter of which is no greater than the outside diameter of the container lip.

Claim 4

A lid as defined in claim 2 formed from low to medium density polyethylene, said web segment being of the order of 0.025 inches thick, and the skirt being of the order of at least 0.060 inches thick.

Claim 5

A lid as defined in claim 1 wherein the container has a channel extending about the container opening radially within the protruding lip, said lid further comprising; a sealing ring molded integrally with and extending downwardly from the underside of the lid, the sealing ring being dimensioned with respect to the channel so as to be received in the channel.

Claim 6

A lid as defined in claim 4 wherein the sealing ring includes a pair of downwardly tapering sidewalls and a groove extending upwardly from and into the bottom of the sealing ring, the groove defining a pair of downwardly extending fingers including an inner and outer finger, each of the fingers being tapered downwardly in cross section.

Claim 7

A lid as defined in claim 5 wherein one of the fingers of the sealing ring is substantially thinner than the other in cross section.

Claim 8

A lid for a container having a sidewall and a lip protruding radially outwardly from the sidewall and extending about the periphery of the upper end of the container sidewall, the lid being formed from resilient plastic material and comprising: a top wall; a relatively thin sidewall web segment extending downwardly from the periphery of the top wall; a relatively thick skirt integral with an extending downwardly from the lower end of the web, said skirt and web being dimensioned so that the skirt will display a greater resistance to radial expansion than the web; the inner surface of the web defining a greater diameter than the inner surface of the skirt portion, thereby to define an inwardly-facing shoulder, the shoulder being spaced from the underside of the lid top member by an amount substantially equal to the height of the container lip; the skirt portion being formed with an interruption; and latch means mounted to the skirt on opposite sides of the interruption, the latch means being constructed and arranged to draw the skirt on opposite sides of the interruption circumferentially toward each other thereby to effect a circumferential constricting force on the skirt, the latch means being constructed and arranged to secure the skirt in its constricted configuration; whereby the lid may be fitted onto the container and upon operation of the latch to constrict the skirt, the web will deform to the cross sectional contour of the container lip with the shoulder being urged into engagement with the underside of of the lip, said web being sufficiently thin, and being dimensioned with respect to the container lip so that upon operation of the latch, the web will stretch heightwise and will wrap around the outer periphery of the container lip.

Claim 9

A lid for a container having a sidewall and a lip protruding radially outwardly from the sidewall and extending about the periphery of the upper end of the container sidewall, the lid being formed from resilient plastic material and comprising: a top wall; a relatively thin sidewall web segment extending downwardly from the periphery of the top wall; a relatively thick skirt integral with an extending downwardly from the lower end of the web, said skirt and web being dimensioned so that the skirt will display a greater resistance to radial expansion than the web; the inner surface of the web defining a greater diameter than the inner surface of the skirt portion, thereby to define an inwardly-facing shoulder, the shoulder being spaced from the underside of the lid top member by an amount substantially equal to the height of the container lip; the skirt portion being formed with an interruption; and latch means mounted to the skirt on opposite sides of the interruption, the latch means being constructed and arranged to draw the skirt on opposite sides of the interruption circumferentially toward each other thereby to effect a circumferential constricting force on the skirt, the latch means being constructed and arranged to secure the skirt in its constricted configuration; whereby the lid may be fitted onto the container and upon operation of the latch to constrict the skirt, the web will deform to the cross sectional contour of the container lip with the shoulder being urged into engagement with the underside of of the lip, said web being sufficiently thin, and being dimensioned with respect to the container lip so that upon operation of the latch, the web will stretch heightwise and will wrap around the outer periphery of the container lip.