Filamented lamp manufacture method
AssigneeGTE Products Corporation
InventorsHarold L. Hough, George J. English
Life of this patent
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Abstract
A method of fabricating a filamented capsule from a tubular blank, and a mold used in such fabrication, is provided wherein a first filament is sealed in a first press seal in one end of the blank, and a preform designed to facilitate insertion and positioning of a second filament is formed in an opposite end of the blank, in a single pressing and blowing step.
Claims10
A method of fabricating a capsule from a tubular blank, the blank having a circular cross section, a first end and a second end, the capsule having an elongated body, a bulbous midsection defining an interior enclosed volume, and two opposed capsule ends adjacent to the midsection, on opposite sides of the midsection, each of the capsule ends having a press seal formed therein and a filament structure having a first lead sealed in the first capsule end, a coil positioned in the enclosed volume, and a second lead sealed in the second capsule end, and a lamp fill in the interior, the method comprising the steps of:
- (a) positioning the filament structure in the blank with the first lead held in place in a first end of the blank, the second lead held in place in a second end of the blank, and the second end of the blank positioned in a seal head,
- (b) positioning a hollow needle in the blank around a portion of the filament structure to be enclosed in the enclosed volume;
- (c) heating the first end of the blank to pliability;
- (d) pressing the blank and blowing in the second end of the blank thereby simultaneously (1) forming a first press seal at the first end of the blank thereby mounting the first lead in the first press seal;
- and (2) forming the bulbous midsection;
- (e) adding a final lamp fill through the seal head to the enclosed volume;
- (f) removing the hollow needle from around at least a portion of the filament structure to expose those portions to be contained in the enclosed volume, and those portions to be captured in the second seal, and
- (g) forming a second hermetic seal at the second end of the blank thereby mounting the second connection lead in the second hermetic seal.
A method of fabricating a capsule from a tubular blank, the blank having a circular cross section, a first end and a second end, the capsule having an elongated body, a bulbous midsection defining an interior enclosed volume, and two opposed capsule ends adjacent to the midsection, on opposite sides of the midsection, each of the capsule ends having a press seal formed therein and a filament structure having a first lead sealed in the first capsule end, a coil positioned in the enclosed volume, and a second lead sealed in the second capsule end, and a lamp fill in the interior, the method comprising the steps of:
- (a) positioning the filament structure in the blank with the first lead held in place in a first end of the blank, the second lead held in place in a second end of the blank, and the second end of the blank positioned in a seal head,
- (b) positioning a hollow needle in the blank around a portion of the filament structure to be enclosed in the enclosed volume;
- (c) heating the first end of the blank to pliability;
- (d) pressing the blank and blowing in the second end of the blank thereby simultaneously (1) forming a first press seal at the first end of the blank thereby mounting the first lead in the first press seal;
- and (2) forming the bulbous midsection;
- (e) adding a final lamp fill through the seal head to the enclosed volume;
- (f) removing the hollow needle from around at least a portion of the filament structure to expose those portions to be contained in the enclosed volume, and those portions to be captured in the second seal, and
- (g) forming a second hermetic seal at the second end of the blank by (1) heating to pliability the second end of the blank, (2) cooling the first press seal end of the blank with liquid nitrogen and (3) freezing out the lamp fill in the blank causing the lamp fill to condense in the bulbous midsection and induce a pressure reduction thereby causing the second end to collapse forming a second hermetic seal at the second end thereby mounting the second filament end in the second hermetic seal.
Dependencies are inferred from the claim text.