PRESS-ON TWIST LIFT-OFF CONTAINER SEALING MEANS

• US 3,741,423 A
• Filed: 10/27/1971
• Issued: 06/26/1973
• Est. Priority Date: 10/27/1971
• Status: Expired due to Term

• Current Assignee: Daniel D. Acton, George J. Foss
• Original Assignee: Daniel D. Acton, George J. Foss
• Inventors: Acton, Daniel D., Foss, George J.
• Primary Examiner(s): Hall, George T.
• Application Number:
  US05/193,031
• Time in Patent Office: 608 Days
• Field of Search: 215/40
• US Class Current: 215/318
• CPC Class Codes: B65D 2543/00027 Stackable lids or covers
• CPC Class Codes: B65D 41/0457 the sealing element covering or co-operating with the screw-thread or the like of a container neck

Abstract

A closure cap is described which is pressed without rotation onto a cooperating container to initially seal it. The cap is removed from the container by a twisting and lifting motion and may thereafter be snapped back onto the container to reseal it. The rim of the container has an interrupted circular slot with radially outwardly directed camming ramps between the slot sections. The closure cap has a plastisol lined skirt including anchoring portions which enter into the slot sections after the press-on sealing operation to hold the closure cap in place. The portions of the gasket entering the slots may be preformed on the gasket or they may be formed during sealing as bulges in the gasket material resulting from a deformation of the gasket during sealing. The outwardly directed ramps facilitate cap removal by wiping off the gasket anchoring positions when the cap is twisted on the jar permitting the cap to be lifted off. Where the cap is used for a vacuum seal, an additional vacuum breaking venting groove may be included in the glass finish. The venting groove is filled with the gasket compound during sealing to provide a hermetic seal and when the cap is twisted during removal, the twisting motion carries the gasket material out of the groove permitting air to pass under the cap gasket and into the sealed package.

Claims

1. A press-on closure cap for sealing a container comprising the combination of a cap shell having a cover and a depending skirt, a gasket on the inside of said depending skirt, and said gasket having a plurality of circumferentially spaced and directed anchoring portions with substantial horizontal sections spaced from the top and bottom of the gasket and projecting radially inwardly of the cap for engaging horizontally positioned slots on the rim of said container and forming removable container engaging projections.

2. The closure cap as claimed in claim 1 in which said gasket extends from an annular zone at the edge of said cover downwardly over the skirt to a line adjacent the skirt edge.

3. The closure cap as claimed in claim 1 in which said gasket comprises plastisol.

4. A press-on twist lift-off closure cap for sealing a container comprising the combination of a cap shell having a cover and a depending skirt, a plastisol gasket covering a major portion of the inside of said skirt, a portion of saId gasket spaced from both the gasket top and bottom having a plurality of radially inwardly projecting anchoring portions with substantial horizontal circumferentially directed sections projecting inwardly into horizontally positioned slots adjacent to the rim of said container and forming removable container engaging projections.

5. The closure cap as claimed in claim 4 in which said projecting portions include an inclined cap lifting section.

6. The closure cap as claimed in claim 4 which further comprises an annular top sealing plastisol gasket extending from the top of said gasket on the cap skirt inwardly on the underside of said cover.

7. The cap as claimed in claim 4 which further includes knobs on said gasket for preventing cap nesting.

8. A sealed package comprising the combination of a closure cap having a cover and a depending skirt, a gasket on the interior surface of the cap skirt, a container, a plurality of horizontal slots on said container forming a circular interruptal groove adjacent the container rim, said gasket having horizontal anchoring portions projecting into said slots, radially outwardly directed ramps at the ends of said slots for engaging and wiping off said gasket projections when said cap is turned on said container.

9. The package as claimed in claim 8 in which said gasket comprises a plastisol gasket.

10. The package as claimed in claim 8 which further comprises an annular top sealing gasket extending from the top of said gasket on the cap skirt over the container rim.

11. The package as claimed in claim 8 in which said container rim is generally circular and includes a non-circular surface below said slots engaging the gasket on the cap skirt.

12. The package as claimed in claim 11 in which said non-circular surface comprises a plurality of adjacent flat sections.

13. The package as claimed in claim 11 in which said non-circular surface includes downwardly and outwardly flared portions for lifting said cap when it is turned.

14. The package as claimed in claim 8 which further comprises knobs on said cap gasket for preventing cap nesting.

15. The package as claimed in claim 8 in which said projecting portions include inclined cap lifting sections.

16. A sealed package comprising the combination of a closure cap having a cover and a depending skirt, a gasket on the interior surface of the cap skirt and around the underside of the margin of the cap cover, a container, a plurality of horizontal slots on said container forming a circular interrupted groove adjacent the container rim, said gasket having horizontal anchoring portions projecting into said slots, radially outwardly directed ramps at ends of said slots for engaging said gasket projections when said cap is turned on said container, and a vent in said container rim position for receiving a portion of said gasket and for being partially opened when said cap is turned on said container.

17. The package as claimed in claim 16 in which said gasket comprises a plastisol gasket.

18. A container finish for receiving and engaging a closure cap having a cover and a depending gasket covered skirt comprising a plurality of horizontal and spaced slots forming an interrupted groove around the outside of the container rim, and said slots having radially outwardly directed gasket wiping ramps at their ends.

20. The container finish as claimed in claim 19 in which said rim portion comprises a generally upwardly facing top sealing surface and a generally cylindrical side sealing surface, said vent being positioned in said top sealing surface, and a second detent in said side sEaling surface.

21. The container finish as claimed in claim 19 in which the portions of the groove intermediate said spaced slots have an at least partially upwardly facing cap lifting portion.

22. A sealed package comprising the combination of a closure cap having a cover and a depending skirt, a gasket on the interior surface of the cap skirt, a container, a plurality of horizontal slots on said container forming a circular interrupted groove adjacent the container rim, said gasket having horizontal anchoring portions projecting into said slots, radially outwardly directed ramps at the ends of said slots for engaging and wiping off said gasket projections when said cap is turned on said container, and a vent in the container rim being filled with a portion of said gasket and positioned for being at least partially opened when said cap is turned on the container.

23. A sealed package comprising the combination of a closure cap having a cover and a depending skirt, a gasket on the interior surface of the cap skirt and having a portion on the outer portion of the cap cover, a container, a plurality of horizontal slots on said container forming a circular interrupted groove adjacent the container rim, said gasket having horizontal anchoring portions projecting into said slots, radially outwardly directed ramps at the ends of said slots for engaging and wiping off said gasket projections when said cap is turned on said container, and a vent in the container rim filled with a portion of the cover portion of said gasket and positioned for being at least partially opened when said cap is turned on said container.