PLUG DEVICES

• US 3,804,126 A
• Filed: 08/14/1972
• Issued: 04/16/1974
• Est. Priority Date: 08/16/1971
• Status: Expired due to Term

• Current Assignee: Willi-Gunter Haferer
• Original Assignee: Willi-Gunter Haferer
• Inventors: Haferer, Willi-Gunter
• Primary Examiner(s): Ruehl, Charles A.
• Application Number:
  US05/280,171
• Time in Patent Office: 610 Days
• Field of Search: 138/89,90 220/24.5 128/218P,218PA 285/302,382 73/49.8
• US Class Current: 138/89
• CPC Class Codes: B01L 3/00 Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
• CPC Class Codes: B01L 3/565 Seals in general F16L
• CPC Class Codes: F16L 55/10 Means for stopping flow from or in pipes or hoses F16L29/00, F16L37/28 take precedence; valves F16K
• CPC Class Codes: G01N 30/6026 Fluid seals
• CPC Class Codes: G01N 30/6034 joining multiple columns
• CPC Class Codes: G01N 30/6082 transparent to radiation

Abstract

A plug device, such as a closure member for a chromatography column, comprises a hollow deformable sleeve member having an internal screw thread, a body member fitting within the sleeve member and having an external screw thread engaging the internal thread of the sleeve member, annular recesses being formed in both the internal wall of the sleeve member and external wall of the body member arranged so that the two recesses are aligned and face each other when the body member is screwed into the sleeve member, and a resilient ring member fitting tightly within the two recesses so as to urge the sleeve member outwardly around the annular recesses to form a tight seal when located in a surrounding tube and to resist unscrewing of the body member from the sleeve member.

Claims

1. A plug device for fitting tightly within a tube, which plug device comprises a hollow deformable sleeve member having an internal screw thread, a body member fitting within the sleeve member and having an external screw thread engaging the internal thread of the sleeve member, annular recesses being formed in both the internal wall of the sleeve member and external wall of the body member arranged so that the two recesses are aligned and face each other when the body member is screwed into the sleeve member, and a resilient ring member fitting tightly within the two recesses so as to urge the sleeve member outwardly around the annular recesses to form a tight seal when located in a surrounding tube and to resist unscrewing of the body member from the sleeve member.

2. A plug device as claimed in claim 1, in which each recess comprises a channel the opposite side walls of which are planar and parallel with each other.

3. A plug device as claimed in claim 2, in which each recess comprises a channel of rectangular cross-section.

4. A plug device as claimed in claim 3 in which the ring member comprises a resilient '"'"''"'"''"'"''"'"'0'"'"''"'"''"'"''"'"' ring.

5. A plug device as claimed in claim 1 in which the body member and sleeve member each have an abutment surface arranged to engage each other when the said recesses are aligned and limit the extent to which the body member may be screwed into the sleeve member.

6. A plug device as claimed in claim 1 in which the body member is connected to a screw threaded adjusting device so that the body member may be rotated to adjust the axial position of the plug device.

7. A plug device as claimed in claim 1 in which the sleeve member is made of polytetrafluoroethylene.

8. A plug device as claimed in claim 1 in which the sleeve member has a closed end wall providing a closed piston face.

9. A plug device as claimed in claim 1 in which a passageway is provided through the body member and sleeve member to allow fluid passage therethrough.

10. A plug device as claimed in claim 9 in which a porous disc is secured to the sleeve member covering the outlet of the passage through the sleeve member.

11. A plug device as claimed in claim 9 in which a central tube extends through the passageway in the body member, one end of the tube sealing against an end wall of the sleeve member around the passageway through the sleeve member.

12. A chromatography column comprising a hollow tube for containing packing material and a plug device fitting tightly within the tube and closing the lower end of the tube, which plug device comprises a hollow deformable sleeve member having an internal screw thread, a body member fitting within the sleeve member and having an external screw thread engaging the internal thread of the sleeve member, annular recesses being formed in both the internal wall of the sleeve member and external wall of the body member arranged so that the two recesses are aligned and face each other when the body member iS screwed into the sleeve member, and a resilient ring member fitting tightly within the two recesses so as to urge the sleeve member outwardly around the annular recesses to form a tight seal against the surrounding tube.