Closure having an improved thread design
AssigneeRexam Medical Packaging Inc.
InventorWilliam Douglas Sprick
Life of this patent
Estimating the term…
Abstract
A closure for use on a container having an externally threaded neck is disclosed wherein an inner surface of a downwardly depending skirt portion of the closure cap includes a helical thread having a flat upper surface with a lower thread profile having a first depth greater than an upper thread profile of a second depth. The helical thread of the closure tapers into the sidewalk of the closure skirt. The closure is provided with a seal integral with the inner surface of the skirt, spaced from a top wall of the closure, and retained at a lowermost point along the downwardly depending skirt by a bead.
Claims20
A closure comprising:
- a top wall;
- a skirt surrounding said top wall and extending downwardly therefrom with a terminating edge opposite said top wall defining an open bottom end;
- a bead integral with an inner surface of said skirt and spaced from said top wall;
- and,
- a helical thread having a substantially flat upper thread surface circumscribing said inner surface of said skirt, said thread having a lower thread profile end of a first horizontal depth and an upper thread profile end of a second horizontal depth, said first horizontal depth being greater than said second horizontal depth, said upper thread profile extending downwardly from said non-back-off bead, said lower thread profile end being nearer said open bottom end than said upper thread profile end.
A closure comprising:
- a top wail and skirt depending from said top wall;
- a bead integral with an inner surface of said skirt and spaced from said top wall;
- and,
- a helical thread having a substantially flat upper thread surface, a lower thread end of a first horizontal depth and an upper thread end of a second horizontal depth, said first horizontal depth being greater than said second horizontal depth, said upper thread end of said thread extending downwardly from said bead, and being closer to said top wall than said lower thread end.
A closure comprising:
- a top wall and an annular skirt depending from said top wall;
- a bead integral with an inner surface of said skirt and spaced from said top wall;
- a helical thread having a substantially flat upper thread surface, a lower thread profile end of a first horizontal depth and an upper thread profile end of a second horizontal depth, said upper thread profile end being nearer said top wall than said lower thread profile end, said first horizontal depth being greater than said second horizontal depth, said upper profile extending downwardly from said bead and said thread having a flat upper surface;
- said thread being tapered to a horizontal depth terminating coincident to said inner surface of said skirt prior to reaching said bead;
- and,
- said thread being variable in horizontal depth over an arc of between 45° and 120° from said upper thread profile end.
A closure, comprising:
- a circular top wall arid skirt depending therefrom;
- a helical thread circumscribing an inner surface of said skirt and having a flat upper surface along its entire length, said flat upper surface being at an angle of about 90° to said skirt;
- said helical thread having a lower profile end with a first horizontal depth of about 0.0475 inches and an upper profile of a second horizontal depth of about 0.01 inch, said upper thread profile being closer said top wall than said lower thread profile end;
- said first horizontal depth being greater than said second horizontal depth such that said upper profile tapers into said skirt sidewalk from said second horizontal depth to a third horizontal depth of about 0 (zero) inches.
Dependencies are inferred from the claim text.