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US 4,305,632 AGranted
Method of making tungsten halogen capsule for headlight
AssigneeGTE Products Corporation
InventorRichard de La Chapelle
Life of this patent
Estimating the term…
Abstract
In the manufacture of a tungsten halogen capsule containing two coiled filaments, the required spacing between filaments is maintained during press sealing by means of a positioning device inserted into the capsule tube at the end opposite the press seal.
Claims5
The method of making a tungsten halogen capsule containing two coiled filaments within a glass envelope comprising the steps of:
- inserting said two filaments, mounted on filament legs, into one end of a glass tube;
- inserting a positioning device into the other end of the glass tube and disposing said device about the filaments in such a manner as to maintain a predetermined spacing between the filaments during the next step of press sealing;
- press sealing said one of the glass tube onto the filament legs;
- removing the positioning device;
- necking down said other end of the glass tube to form an exhaust tubulation;
- and exhausting, filling and sealing said capsule through said tubulation.
3 more elements
The method of making a tungsten halogen capsule containing two coiled filaments within a glass envelope comprising the steps of:
- disposing two filaments into a glass tube;
- supporting said filaments by support means, including filament legs, located at one end of the glass tube;
- inserting a positioning device into the other end of the glass tube and disposing said device about the filaments in such a manner as to maintain a predetermined spacing between the filaments during the next step of press sealing;
- press sealing said one end of the glass tube to embed a portion of the filament legs or other parts of the support means in the press seal;
- removing the positioning device;
- necking down said other end of the glass tube to form an exhaust tubulation;
- and exhausting, filling and sealing said capsule through said tubulation.
4 more elements
Dependencies are inferred from the claim text.