Lamp electrode and method for delivering mercury

Information

  • Patent Application
  • 20070216309
  • Publication Number
    20070216309
  • Date Filed
    September 14, 2006
    17 years ago
  • Date Published
    September 20, 2007
    16 years ago
Abstract
A lamp electrode adapted to deliver mercury during an assembly process has a supporting electrical lead attached to the proximal end of a metallic shell. The proximal and a distal ends of the metallic shell each lie along a central axis. A container with a vitreous plug in a sealed end contains a substance for delivering mercury upon heating of the container. The sidewall of the container is attached to the electrical lead. The longitudinal axis of the container is skewed relative to the electrical lead to orient the container in a direction to reduce discharge of mercury directly toward the metallic shell. The container is heated to open it and discharge a mercury dose from the sealed, end, which is prone to opening upon heating of the container.
Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above brief description as well as other objects, features and advantages of the present invention will be more fully appreciated by reference to the following detailed description of illustrative embodiments in accordance with the present invention when taken in conjunction with the accompanying drawings, wherein:



FIG. 1 is a side view of a container in accordance with principles of the present invention;



FIG. 2 is an exploded, cross-sectional view of the container of FIG. 1;



FIG. 3 is a side view of a lamp electrode in accordance with principles of the present invention and employing the container of FIG. 1;



FIG. 4 is a detailed side view of a fragment of the shell, lead, and container of FIG. 3;



FIG. 5 is a side view taken along line 5-5 of FIG. 4;



FIG. 6 is a schematic diagram of a mechanism for sealing the container of FIG. 1;



FIG. 7 is an apparatus for welding containers of the type shown in FIG. 1 to a lead of the type shown in FIG. 3;



FIG. 8 is a side view of an implement shown in FIG. 7;



FIG. 9 is a side view of a lamp electrode that is an alternate to that of FIG. 3;



FIG. 10 is a fragmentary side view taken along line X-X of FIG. 9;



FIG. 11 is a side view of a portion of an electrode that is an alternate to that of FIG. 10;



FIG. 12 is a side view taken along line XII-XII of FIG. 11;



FIG. 13 is a side view of a portion of an electrode that is an alternate to that of FIGS. 10 and 11;



FIG. 14 is a side view of a portion of an electrode that is an alternate to those previously illustrated;



FIG. 15 is a side view of a portion of an electrode that is an alternate to those previously illustrated; and



FIG. 16 is a side view of a portion of an electrode that is an alternate to those previously illustrated.


Claims
  • 1. A lamp electrode adapted to deliver mercury during an assembly process, comprising: an electrode subassembly including:(a) a metallic shell having a proximal end and a distal end each lying along a central axis,(b) a supporting electrical lead attached to the proximal end of said metallic shell, and(c) a vitreous tube fused onto said electrical lead to surround said shell; anda container having a sidewall, a sealed end, and a longitudinal axis, said container containing a substance for delivering mercury upon heating of said container, said container being attached to said electrode subassembly and spaced proximally from said metallic shell, the longitudinal axis of the container being skewed relative to said central axis to orient said container in a direction to reduce discharge of mercury directly toward said metallic shell.
  • 2. A lamp electrode according to claim 1 wherein said sealed end is prone to opening upon heating of said container.
  • 3. A lamp electrode according to claim 1 wherein said container is spaced proximally from said metallic shell by an offset distance in order to avoid premature mercury delivery from said container upon heating of said shell.
  • 4. A lamp electrode according to claim 1 wherein the sidewall of said container is attached to said electrical lead.
  • 5. A lamp electrode according to claim 1 wherein said electrode subassembly comprises a rod attached to said shell, said container being attached to said rod.
  • 6. A lamp electrode according to claim 1 wherein said container contains in addition to the mercury delivering substance an inert gas.
  • 7. A lamp electrode according to claim 1 wherein said container has opposite said sealed end an opposite end that is further from said shell than said sealed end, said sealed end being prone to opening upon heating of said container.
  • 8. A lamp electrode according to claim 7 wherein said sealed end of said container is further from said central axis than the opposite end of said container.
  • 9. A lamp electrode according to claim 7 wherein said longitudinal axis of said container intersects a plane transverse to the central axis at an acute angle of at most 85°.
  • 10. A lamp electrode according to claim 1 wherein said container comprises: a cup; anda annular header with a flange sealingly attached to said cup, said cup having a mouth with an outwardly projecting lip and a domed bottom, said sidewall being shaped substantially cylindrically.
  • 11. A lamp electrode according to claim 1 wherein said lead has a hairpin configuration with a hairpin turn that is attached to said shell, said lead lying in a central plane, the longitudinal axis of said container being parallel to said central plane.
  • 12. A lamp electrode adapted to deliver mercury during an assembly process, comprising: an electrode subassembly including:(a) a metallic shell having a proximal end and a distal end each lying along a central axis,(b) a supporting electrical lead attached to the proximal end of said metallic shell, and(c) a vitreous tube fused onto said electrical lead to surround said shell; anda container containing a substance for delivering mercury upon heating of said container, said container having a sealed end with a vitreous plug, said container being supported on said electrode subassembly.
  • 13. A lamp electrode according to claim 12 wherein said sealed end is prone to opening upon heating of said container.
  • 14. A lamp electrode according to claim 12 wherein said plug comprises lead-free glass that is prone to melting upon heating of said container.
  • 15. A lamp electrode according to claim 12 wherein said plug comprises glass that is prone to one or more of melting, fracturing, or dislodging upon heating of said container.
  • 16. A lamp electrode according to claim 12 wherein said plug is color coded to indicate the quantity of mercury delivering substance in said container.
  • 17. A lamp electrode according to claim 12 wherein said container has a metallic cup that is attached to said electrical lead.
  • 18. A lamp electrode according to claim 12 wherein sid electrode subassembly comprises a rod attached to said shell, said container being attached to said rod.
  • 19. A lamp electrode according to claim 12 wherein said container has opposite said vitreous plug an opposite end that is further from said shell than said sealed end.
  • 20. A lamp electrode according to claim 12 wherein said container comprises: a cup and an annular header sealingly attached to said cup, said vitreous plug being centrally mounted in said header.
  • 21. A lamp electrode according to claim 20 wherein said header has a flange, said cup having a mouth with an outwardly projecting lip and a domed bottom, said sidewall being cylindrically shaped.
  • 22. A lamp electrode according to claim 12 wherein said lead has a hairpin configuration with a hairpin turn attached to said shell, said lead lying in a central plane, said container having a longitudinal axis that is parallel to said central plane.
  • 23. A lamp electrode adapted to deliver mercury during an assembly process, comprising: an electrode subassembly including:(a) a metallic shell having a proximal end and a distal end each lying along a central axis,(b) a supporting electrical lead attached to said proximal end of said metallic shell, and(c) a vitreous tube fused onto said electrical lead to surround said shell; anda container spaced proximally from said shell and having a sidewall, a sealed end, and a longitudinal axis, said container containing a substance for delivering mercury upon heating of said container, said container being supported by said electrode subassembly, said sealed end being prone to opening upon heating of said container, the container being oriented in a direction to reduce discharge of mercury directly toward said metallic shell.
  • 24. A method for releasing a dose of mercury from a container attached to an electrode subassembly having a vitreous tube surrounding a shell supported by an electrical lead, the method comprising the steps of: orienting said container to reduce discharge of mercury directly toward said metallic shell; andheating said container to open said container and discharge a mercury dose contained therein.
  • 25. A method according to claim 24 wherein said container has a vitreous plug, the method comprising the step of: melting the vitreous plug to discharge a mercury dose.
  • 26. A method according to claim 24 wherein said container has a metallic cup sealed with a header, the method comprising the step of: heating the container sufficiently to expel the header.
  • 27. A method according to claim 24 comprising the step of: filling said container with liquid mercury and an inert gas.
  • 28. A method according to claim 24 wherein the step of orienting said container being performed to cause discharge of mercury along a path between said vitreous tube and said metallic shell.
  • 29. A method according to claim 24 comprising the step of: sealing said container at a sealed end, the step of orienting said container being performed by positioning an end of said container that is opposite said sealed end further from said shell than said sealed end, the step of heating said container being performed to open said sealed end.
  • 30. A method according to claim 29 wherein the step of orienting said container being performed by positioning the end of said container opposite said sealed end further from said vitreous tube than the sealed end of said container.
  • 31. A method according to claim 30 comprising the step of: fusing said vitreous tube to said electrical lead without bringing melted portions of said tube close enough to said container to open it.
  • 32. A method for releasing a dose of mercury employing an electrode subassembly supporting a container with a vitreous sealing plug, comprising the steps of: heating said vitreous sealing plug to defeat its sealing properties and open said container in order to discharge a mercury dose contained therein in proximity to said electrode subassembly.
  • 33. A method according to claim 32 wherein the step of heating said vitreous plug is performed by melting said vitreous plug in order to open said container.
  • 34. A method according to claim 32 wherein the step of heating said vitreous plug is performed by fracturing said vitreous plug in order to open said container.
  • 35. A method according to claim 32 wherein the step of heating said vitreous plug is performed by dislodging said vitreous plug in order to open said container.
  • 36. A method according to claim 32 comprising the step of: fusing said vitreous tube to said electrical lead without bringing melted portions of said tube close enough to said container to open it.
  • 37. A method according to claim 32 comprising the step of: color coding the vitreous plug to indicate mercury dosage in said container.
Continuation in Parts (1)
Number Date Country
Parent 11376576 Mar 2006 US
Child 11522547 US