DOUBLE SEAL CLOSURE PLUG

• US 3,826,396 A
• Filed: 10/31/1972
• Issued: 07/30/1974
• Est. Priority Date: 10/31/1972
• Status: Expired due to Term

• Current Assignee: James J. Frassica
• Original Assignee: James J. Frassica
• Inventors: Frassica, James J.
• Primary Examiner(s): Price, William I.
• Assistant Examiner(s): Hart, Ro E.
• Application Number:
  US05/302,441
• Time in Patent Office: 637 Days
• Field of Search: 215/6,40,47,56,74,80 138/89 277/135
• US Class Current: 215/234
• CPC Class Codes: B65D 41/005 with integral sealing means B65D41/02 takes precedence

Abstract

A closure plug for a tubular opening as in the neck of a receptacle or at the end of a conduit, wherein a plug portion enters the opening with a close fit to constitute a mechanical seal, while an outer skirt portion of the plug forms an annular enclosed recess about the exterior of the opening, an axially movable piston in the top of the plug being forced into a cylindrical chamber in the plug to drive a quantity of sealing (sterilizing) liquid from said chamber into the recess to form a liquid barrier seal around the exterior of the opening, the lip of the opening being thus enclosed externally and internally.

Claims

1. A closure plug for a tubular opening comprising a plug body portion and a piston, the plug body portion having a cylindrical part adapted to fit in the opening to be closed, a skirt portion located radially outward from the cylindrical part and adapted to fit against an outer surface of the device having a tubular opening, means connecting the skirt portion and the cylindrical part to form therebetween an inverted annular channel, an annular collar projecting upwardly from said means and presenting a smooth cylindrical inner wall surface, and the piston having a stem and a head, the stem being adapted to fit within the cylindrical part, the head being adapted to fit within the collar and the stem having a reduced cross-sectional area adjacent the under side of the head, the wall of the cylindrical part being traversed by a radial passage connecting the interior of said part with the annular channel.

2. A closure plug according to claim 1 wherein the height of the piston head is substantially equal to the height of the collar.

3. A closure plug according to claim 1 wherein the skirt is provided with a radially disposed air vent.

4. A closure plug according to claim 3 wherein the radial passage and the air vent are located at points near the connecting means.

5. A closure plug according to claim 1 which includes a quantity of liquid confined in the annular space defined by the wall surface of the collar, the under side of the head, and the reduced area portion of the piston stem.

6. A closure plug according to claim 1 wherein the cylindrical part and the piston stem are complementarily screw threaded.

7. In combination, a tube adapter having a tubular opening to be closed and presenting cylindrical inside and outside surfaces adJacent said opening, with a lip between said surfaces and a closure plug for said opening, the closure plug comprising a plug body portion and a piston, the plug body portion having a cylindrical part fitting against said inside surface, a skirt portion located radially outward from the cylindrical part and fitting against said outer surface, means connecting the skirt portion and the cylindrical part to form therebetween an inverted annular channel, an annular collar projecting upwardly from said means and presenting a smooth cylindrical inner wall surface, and the piston having a stem and a head, the stem being fitted within the cylindrical part, the head being fitted within the collar and the stem having a reduced cross-sectional area adjacent the under side of the head, the lip being spaced from the connecting means to form an annular sealing space and the wall of the cylindrical part being traversed by a radial passage connecting the interior of said part with the annular sealing space.

8. The combination according to claim 7 wherein the height of the piston head is substantially equal to the height of the collar.

9. The combination according to claim 7 wherein the skirt is provided with a radially disposed air vent.

10. The combination according to claim 7 wherein the radial passage and the air vent are located at points near the connecting means.

11. The combination according to claim 7 which includes a quantity of liquid within the sealing space adjacent to the lip.

12. The combination according to claim 11 wherein the tube adapter is shaped to provide an enlarged sealing space radially outward from the lip, between the lip and the cylindrical outside surface.