Plug and method of manufacture

• US 6,215,126 B1
• Filed: 09/03/1998
• Issued: 04/10/2001
• Est. Priority Date: 09/03/1998
• Status: Expired due to Term

• Current Assignee: Purifics Environmental Technologies Incorporated
• Original Assignee: Purifics Environmental Technologies Incorporated
• Inventors: Butters, Brian E., Powell, Anthony Leonard
• Primary Examiner(s): Hannaher, Constantine
• Assistant Examiner(s): Gabor, Otilia
• Application Number:
  US09/146,453
• Time in Patent Office: 950 Days
• Field of Search: 250/372
• US Class Current: 250/483.1
• CPC Class Codes: C02F 1/325 Irradiation devices or lamp constructions
• CPC Class Codes: C02F 2201/3227 Units with two or more lamps
• CPC Class Codes: C02F 2201/324 Lamp cleaning installations, e.g. brushes
• CPC Class Codes: H01R 13/5205 Sealing means between cable and housing, e.g. grommet H01R13/5221 takes precedence

Abstract

A plug for an enclosure for holding a radiation source is provided. The plug is formed from a material that emits visible light when the radiation source is energized, such that the status of the radiation source may be determined by an operator without the need for status monitoring equipment. The plug seals the radiation source from the environment to prevent ozone formation and to prevent leakage into or out of the enclosure.

Claims

1. A plug for an enclosure in which a radiation source is disposed, wherein the plug comprises ultraviolet-activated material that emits visible light when the radiation source is energized.

2. The plug of claim 1 wherein the radiation source is an ultraviolet lamp.

3. The plug of claim 2 wherein the material substantially blocks ultraviolet light but not visible light emitted by the ultraviolet lamp.

4. The plug of claim 2 wherein the material passes from an inactive state to an active state by absorbing ultraviolet light and emitting visible light.

5. The plug of claim 1 wherein the material from which the plug is formed comprises a polycarbonate substance.

6. The plug of claim 1 further comprising a watertight seal that prevents the ingress or egress of water from the enclosure.

7. The plug of claim 1 further comprising a fastener operable to fasten the plug to the enclosure, thereby maintaining the plug in position.

8. The plug of claim 1 further comprising one or more conducting elements extending through the plug, so as to allow the radiation source to be electrically connected to a power source external to the enclosure.

9. An apparatus for holding a radiation source comprising:

an external housing formed from a transparent or translucent material, the external housing having at least one opening through which the radiation source may be inserted into the external housing;

a plug disposed in the opening of the external housing, wherein the plug comprises ultraviolet-activated material that emits visible light when the radiation source is energized; and

one or more conducting elements extending through the plug, so as to allow the radiation source within the external housing to be electrically connected to a power source external to the enclosure.

10. The apparatus of claim 9 wherein the external housing is a quartz tube.

11. The apparatus of claim 9 wherein the radiation source is an ultraviolet lamp.

12. The apparatus of claim 9 wherein the material from which the plug is formed comprises a polycarbonate substance.

13. The apparatus of claim 9 further comprising a threaded nut, where the opening of the external housing is threaded in a manner to mate with the threaded nut, and the threaded nut and external housing are configured to maintain the plug in position.

14. The apparatus of claim 9, wherein the plug material substantially blocks ultraviolet light but not visible flight emitted from the radiation source.

15. The apparatus of claim 9, wherein the plug comprises ultraviolet luminescent material.

16. The apparatus of claim 9, wherein the plug is visible outside the enclosure.

17. A method for decreasing ozone generation in a decontamination system comprising:

disposing a radiation source in an enclosure;

sealing the enclosure with an airtight ultraviolet-activated plug, that is operable to emit light when the radiation source is energized; and

electrically connecting the radiation source to a power source using a conductor that extends through an aperture formed in the airtight ultraviolet-activated plug.

18. The method of claim 17 further comprising:

periodically monitoring the status of the plug to determine if the plugs is not emitting light; and

replacing the radiation source when the plug is not emitting light.

19. The method of claim 17 wherein sealing the enclosure with an airtight translucent plug further comprises:

installing the plug into the enclosure with an o-ring seal between the plug and the enclosure; and

installing a fastener into the enclosure so as to apply a force to the plug, the o-ring seal, and the enclosure, thereby sealing the enclosure.

20. The method of claim 19 wherein the fastener is a threaded fastener.

21. The method of claim 17, wherein sealing the enclosure with an airtight ultraviolet plug further comprises:

sealing the enclosure with an airtight plug comprising material, wherein the material substantially blocks ultraviolet light but not visible light emitted by the radiation source.

22. The method of claim 17, wherein sealing the enclosure with an airtight ultraviolet plug further comprises:

sealing the enclosure with an airtight plug comprising ultraviolet luminescent material.

23. The method of claim 17, wherein sealing the enclosure with the airtight ultraviolet activated plug further comprises:

sealing the enclosure with an airtight ultraviolet activated plug, wherein the plug is visible outside the decontamination system.

24. A method for making a plug for an enclosure holding a radiation source comprising:

forming a plug from ultraviolet-activated material having predetermined dimensions;

forming a seal structure onto the plug;

forming a penetration through the plug; and

installing a conductor through the penetration.

25. The method of claim 24 wherein forming the plug from the ultraviolet-sensitive material having predetermined dimensions comprises machining a polycarbonate material to form a cylinder having a predetermined radius and length.

26. The method of claim 24 wherein forming the plug from the ultraviolet-sensitive material having predetermined dimensions comprises injecting an ultraviolet-luminescent material into a mold having predetermined dimensions.

27. The method of claim 24 wherein forming a seal structure onto the plug comprises machining an o-ring seat into the plug.

28. The method of claim 24 wherein forming a penetration through the plug comprises machining an axial hole through the plug.

29. The method of claim 24 wherein forming the penetration through the plug comprises injecting an ultraviolet-luminescent material into a mold having predetermined dimensions and a penetration channel.

30. The method of claim 24 wherein installing the conductor through the penetration comprises threading a conductor through a machined hole.

31. The method of claim 24 wherein installing the conductor through the penetration comprises:

placing a conductor into a penetration channel in an injection mold; and

injecting an ultraviolet-luminescent material into the mold so as to surround the conductor in the penetration channel.

32. The method of claim 24, wherein forming the plug from ultraviolet-activated material further comprises:

forming the plug from material, wherein the material substantially blocks ultraviolet light but not visible light emitted by the radiation source.

33. The method of claim 24, wherein forming the plug from ultraviolet-activated material further comprises:

forming the plug from ultraviolet luminescent material.