US 4,903,849 A · Tamper evident cap and bottle

Abstract

A tamper evident push-on type integral synthetic plastic closure cap for an externally beaded container neck, the body of the cap being formed with a thin central disk region, a thicker surrounding rim region, an interior ridged inner skirt provided with an interior sloping wall portion descending from the inner edge of the rim region, and an outer skirt descending from the outer edge of the rim region, the outer skirt being provided with an arcuate, buttressed lifting tab extending horizontally from a portion of the outer skirt, two inward projecting ribs on the internal side of the skirt, a circumferential weakened region in the skirt disposed between the ribs separating the skirt into distinct upper and lower regions and a descending tear tab projecting downwardly from the lower edge of the lower region of said skirt so that lifting of the tab will break the wall of the skirt and separate the skirt at the weakened region to detach the lower skirt and rib from the remainder of the cap by tearing along the circumferential weakened region.

Claims10

Dependent claims

A molded plastic cap having a central disk having a substantially uniform thickness,

a rim region surrounding said central disk,
a thin walled outer skirt downwardly descending from the outer edge of the rim,
a score line extending circumferentially around the outer skirt to divide the skirt into an upper section and a lower tear ring section,
a substantially circumferential rib on the inner wall of said outer skirt below said score line, and
an inner, positive sealing, guide skirt descending from the inner edge of said rim region,
characterized by a substantially rigid, arcuate, buttressed lifting tab perpendicular to and positioned on the exterior surface of said outer skirt, and covering less than 25% of the circumference of the outer surface of the outer skirt and supported substantially beneath its entire surface by a smooth, arcuate buttress.

3 more elements

A molded plastic cap having a central disk having a substantially uniform thickness,

a rim region surrounding said central disk,
a thin walled outer skirt downwardly descending from the outer edge of the rim,
a score line extending circumferentially around the outer skirt to divide the skirt into an upper section and a lower tear ring section,
a substantially circumferential rib on the inner wall of said outer skirt below said score line, and
an inner, positive sealing, guide skirt descending from the inner edge of said rim region,
characterized by an arcuate tab perpendicular to and positioned on the exterior surface of said outer skirt, and
an arcuate buttress supporting said tab,
said tab being positioned below the uppermost surface of said rim a distance substantially halfway between the upper surface of said central disk and the score line on said outer skirt,
wherein said inner skirt has a vertical inner wall, a vertical outer wall, a downwardly and inwardly sloping lower region on said outer wall and a ridge protruding from the lower portion of said inner wall opposite said sloping region on said outer wall.

6 more elements

Dependencies are inferred from the claim text.

Tamper evident cap and bottle

Life of this patent

Tamper evident cap and bottle

Life of this patent

Abstract

Claims10