Stopper for sealing containers

Claim 2

AN ELASTOMERIC STOPPER FOR SEALING A CONTAINER HAVING AN ANNULAR LUG INWARDLY PROJECTING AT THE EDGE OF THE CONTAINER OPENING PORTION, COMPRISING A CYLINDRICAL STOPPER BODY AND AN ANNULAR GROOVE FORMED IN SAID BODY SPATIALLY FROM THE UPPER END OF THE STOPPER BODY, WHEREBY SAID STOPPER INSERTED WITH ITS GROVE BELOW THE LUG OF THE CONTAINER MAY BE PUSHED UP WITH THE PRESSURE BUILT UP IN THE CONTAINER DURING THE INSERTION OF THE STOPPER UNTIL THE GROOVE ENGAGES THE LUNG AND BECOMES FIXED TIGHT IN THE CONTAINER.

Claim 3

A stopper according to claim 1, wherein the stopper body is tapered at its lower end portion, and said annular groove is defined by a ring-shaped protrusion formed on the intermediate portion of the outer circumference of said tapered section and having its outer circumference made substantially flush with the outer circumference of the stopper body and the tapered plane positioned above said ring-shaped protrusion.

Claim 4

A stopper according to claim 1, wherein said annular groove is formed adjacent to the lower end of said stopper body.

Claim 5

An elastomeric stopper for sealing a container having an annular lug inwardly projecting at the edge of the container opening portion, comprising a cylindrical hollow stopper body whose lower end portion is tapered, an enlarged head formed integrally At the upper end of said body and having a recess at its upper end, and a ring-shaped protrusion which is formed on the intermediate portion of the outer circumference of said tapered end portion of said body, has its outer circumference made substantially flush with the outer circumference of the stopper body and constitutes an annular groove with the tapered plane of said stopper body positioned above it, whereby said stopper inserted with its groove below the lug of the container may be pushed up with the pressure built up in the container during the insertion of the stopper until the groove engages the lug and becomes fixed tight in the container.

Claim 6

An elastomeric stopper for sealing a container having an annular lug inwardly projecting at the edge of the container opening portion, comprising a cylindrical hollow stopper body whose lower end portion is tapered, an enlarged head formed integrally At the upper end of said body and having a recess at its upper end, and a ring-shaped protrusion which is formed on the intermediate portion of the outer circumference of said tapered end portion of said body, has its outer circumference made substantially flush with the outer circumference of the stopper body and constitutes an annular groove with the tapered plane of said stopper body positioned above it, whereby said stopper inserted with its groove below the lug of the container may be pushed up with the pressure built up in the container during the insertion of the stopper until the groove engages the lug and becomes fixed tight in the container.

Claim 7

An elastomeric stopper for sealing a container having an annular lug inwardly projecting at the edge of the container opening portion comprising a cylindrical stopper body having a tapered lower end, an enlarged head formed integrally on the upper end of said body, central recesses in said body and head whereby the stopper presents a closure barrier in its central portion of substantially less longitudinal dimensions than the overall length of the stopper, and a single annular groove on said stopper body adjacent the lower end thereof, said groove being defined by a first plane which extends radially into the stopper body and a second plane which extends into the stopper body above said first plane at an acute angle to said first plane and intersects said first plane within the stopper body.

Claim 8

An elastomeric stopper for sealing a container having an annular lug inwardly projecting at the edge of the container opening portion comprising a cylindrical stopper body having a tapered lower end, an enlarged head formed integrally on the upper end of said body, central recesses in said body and head whereby the stopper presents a closure barrier in its central portion of substantially less longitudinal dimensions than the overall length of the stopper, and a single annular groove on said stopper body adjacent the lower end thereof, said groove being defined by a first plane which extends radially into the stopper body and a second plane which extends into the stopper body above said first plane at an acute angle to said first plane and intersects said first plane within the stopper body.

Claim 9

A blood sampling container comprising a sampling tube having a closed end and an open end, an annular lug inwardly projecting at the edge of said open end and an elastomeric stopper comprising a cylindrical stopper body having a tapered lower end, an enlarged head formed integrally on the upper end of said body, the lower end of said head presenting a flat ledge extending radially beyond said stopper body, central recesses in said body and head whereby the stopper presents a closure barrier in its central portion of substantially less longitudinal dimension than the overall length of said stopper and a single annular groove on said stopper body adjacent the lower end thereof, said groove having a depth substantially corresponding to the radial dimension of said annular lug, said stopper extending into the open end of said tube with said flat ledge of the stopper in contact with said edge of the open end sealing the container by engagement of said lug with a portion of said stopper body above said annular groove.

Claim 10

A blood sampling container comprising a sampling tube having a closed end and an open end, an annular lug inwardly projecting at the edge of said open end and an elastomeric stopper comprising a cylindrical stopper body having a tapered lower end, an enlarged head formed integrally on the upper end of said body, the lower end of said head presenting a flat ledge extending radially beyond said stopper body, central recesses in said body and head whereby the stopper presents a closure barrier in its central portion of substantially less longitudinal dimension than the overall length of said stopper and a single annular groove on said stopper body adjacent the lower end thereof, said groove having a depth substantially corresponding to the radial dimension of said annular lug, said stopper extending into the open end of said tube with said flat ledge of the stopper in contact with said edge of the open end sealing the container by engagement of said lug with a portion of said stopper body above said annular groove.