Claims
- 1. In an electrical device wherein a sealed vacuum area is surrounded by an envelope and the envelope includes first and second portions joined together along adjacent ends thereof, the improvement wherein said joint is characterized in that
- an end of the first portion overlaps a limited length of an end of said second portion,
- the end of said first portion being inside of said end of said second portion and having a terminal flare positioned with an edge of said flare making line contact with said second portion end inwardly of the edge of said second portion end and throughout said overlap said first and second portions being otherwise spaced apart and defining an area therebetween which comes to a point at said line contact, said terminal flare being concaved when viewed from outside of said envelope,
- and a braze alloy filling said area to mechanically join said first and second portion and provide a vacuum-type seal at said joint.
- 2. The combination of claim 1 wherein said ends of said first and second portions are generally cylindrical and said end of said first portion is flared radially into engagement with said second portion.
- 3. The combination of claim 1 wherein said second portion includes a radially offset portion at its end and said first portion end fits into said offset with the end edge thereof engaged within said offset portion to define said line contact.
- 4. The combination of claim 3 wherein said area is generally triangular in cross section.
- 5. The combination of claim 1 wherein
- the end of said first portion is inside of the end of said second portion,
- said second portion includes an offset portion at its end and an offsetting shoulder disposed at an angle to said offset portion and the remainder of said second portion end,
- and said edge of said first portion is engaged with said second portion within said offset shoulder to define said line contact.
- 6. The combination of claim 5 wherein said area is generally triangular in cross ection.
Parent Case Info
This is a continuation of application Ser. No. 551,658 filed Feb. 21, 1976, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
136690 |
Dec 1919 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
551658 |
Feb 1976 |
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