US3840953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of assembling a filament-mount for a single-ended incandescent lamp
Assignee: Philips North America LLC
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Filing: 1973-04-18
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Granted: 1974-10-15
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Expires: 1993-04-18
Abstract
Abstract The coiled-coil filament of a quartz-halogen lamp is formed from a continuously-wound primary coil and is provided with a leg at each end. The filament is suspended in coaxial position within the tubular envelope by a pair of lead wires that extend into and are secured directly to the coil legs. A selected primary turn of the continuously-wound filament leg at the tipped-off end of the envelope is bent to provide an opening in the leg and the associated end of the lead wire is formed into an L-shaped hook that is inserted into the leg and through the opening therein so that the end of the hook projects beyond the filament.
Inventors
- 👤 J Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
H; H01; H01K; H01K3/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
296 words
In the manufacture of a filament-mount assembly for an electric incandescent lamp wherein a coiled-coil filament of refractory metal wire and linear configuration is attached directly to the ends of a pair of rigid lead wires that hold the filament in place within the lamp envelope, the method of mechanically coupling and electrically connecting the filament to one of said lead wires, which method comprises the steps of; fabricating said coiled-coil filament from a continuous primary winding and providing a depending singly-coiled leg of uniformly-spaced and continuously-wound primary turns at the end of the filament which is to be fastened to said lead wire, inserting a tool into the free end of said filament leg and manipulating said tool so that the tip thereof bends and permanently displaces a selected primary turn from its as-wound configuration and thereby forms an opening in said leg, withdrawing said tool from the filament leg, shaping the end of said lead wire into a generally L-shaped hook which has a transverse arm segment and an upstanding stud segment that are joined by an arcuate bend having a predetermined radius of curvature, said arm segment being joined to the body portion of said lead wire and said stud segment constituting the terminus of said lead wire, inserting the stud segment of said lead wire hook into the free end of said filament leg and manipulating the lead wire until the stud segment and arcuate bend portion of the hook pass through the opening formed in the filament leg and the arm segment of the hook is disposed within said filament leg, and then securing said lead wire to a bridge member that is joined to the other lead wire and thus maintains the filament and lead wires in assembled operative relationship.
Claim 2
Dependent Claim
296 words
In the manufacture of a filament-mount assembly for an electric incandescent lamp wherein a coiled-coil filament of refractory metal wire and linear configuration is attached directly to the ends of a pair of rigid lead wires that hold the filament in place within the lamp envelope, the method of mechanically coupling and electrically connecting the filament to one of said lead wires, which method comprises the steps of; fabricating said coiled-coil filament from a continuous primary winding and providing a depending singly-coiled leg of uniformly-spaced and continuously-wound primary turns at the end of the filament which is to be fastened to said lead wire, inserting a tool into the free end of said filament leg and manipulating said tool so that the tip thereof bends and permanently displaces a selected primary turn from its as-wound configuration and thereby forms an opening in said leg, withdrawing said tool from the filament leg, shaping the end of said lead wire into a generally L-shaped hook which has a transverse arm segment and an upstanding stud segment that are joined by an arcuate bend having a predetermined radius of curvature, said arm segment being joined to the body portion of said lead wire and said stud segment constituting the terminus of said lead wire, inserting the stud segment of said lead wire hook into the free end of said filament leg and manipulating the lead wire until the stud segment and arcuate bend portion of the hook pass through the opening formed in the filament leg and the arm segment of the hook is disposed within said filament leg, and then securing said lead wire to a bridge member that is joined to the other lead wire and thus maintains the filament and lead wires in assembled operative relationship.
Claim 3
Dependent Claim
96 words
The method of claim 1 wherein; the depending leg of said coiled-coil filament extends transversely relative to the filament axis. the arm segment of said lead wire hook is joined to the body portion of the lead wire by a sharp angular bend, and the L-shaped hooked end of said lead wire is inserted into the filament leg until the free end of said leg is seated against the sharp angular bend in said lead wire and said bend thus serves as a stop that positions the filament on the hooked end of said lead wire.
Claim 4
Dependent Claim
46 words
The method of claim 2 wherein; the hooked end of said lead wire is of uniform circular cross-section, and the radius of curvature of the arcuate bend portion of said lead wire is at least three times as large as the diameter of said lead wire.
Claim 5
Dependent Claim
42 words
The method of claim 2 wherein; said tool comprises a pointed mandrel-like member that has a diameter which is slightly smaller than the inner diameter of the filament leg, and the pointed end of said member is inserted into the filament leg.
Claim 6
Dependent Claim
282 words
In the manufacture of a filament-mount assembly for an electric incandescent lamp wherein a coiled-coil filament of refractory metal wire and linear configuration is attached directly to the ends of a pair of rigid Lead wires that hold the filament in place within the lamp envelope, the method of mechanically coupling and electrically connecting the filament to one of said wires, which method comprises the steps of; fabricating said coiled-coil filament from a continuous primary winding and providing a longitudinally depending singly coiled leg of uniformly-spaced and continuously wound primary turns at the end of the filament which is to be fastened to said lead wire, inserting a tool into the free end of said filament leg and manipulating said tool so that the tip thereof bends and permanently displaces a selected primary turn from its as-wound configuration and thereby forms an opening in said leg, withdrawing said tool from the filament leg, shaping the end of said lead wire into a generally L-shaped hook which has a transverse arm segment and an upstanding stud segment that are joined by an arcuate bend, said arm segment being joined to the body portion of said lead wire and said stud segment constituting the terminus of said lead wire, inserting the stud segment of said lead wire hook into the opening formed in said filament leg and manipulating the lead wire until the stud segment of the hook is located within the leg and the latter engages the arcuate bend portion of said hook, and then securing said lead wire to a bridge member that is coupled to the other lead wire and thus maintains the filament and lead wires in assembled operative relationship.
Claim 7
Dependent Claim
282 words
In the manufacture of a filament-mount assembly for an electric incandescent lamp wherein a coiled-coil filament of refractory metal wire and linear configuration is attached directly to the ends of a pair of rigid Lead wires that hold the filament in place within the lamp envelope, the method of mechanically coupling and electrically connecting the filament to one of said wires, which method comprises the steps of; fabricating said coiled-coil filament from a continuous primary winding and providing a longitudinally depending singly coiled leg of uniformly-spaced and continuously wound primary turns at the end of the filament which is to be fastened to said lead wire, inserting a tool into the free end of said filament leg and manipulating said tool so that the tip thereof bends and permanently displaces a selected primary turn from its as-wound configuration and thereby forms an opening in said leg, withdrawing said tool from the filament leg, shaping the end of said lead wire into a generally L-shaped hook which has a transverse arm segment and an upstanding stud segment that are joined by an arcuate bend, said arm segment being joined to the body portion of said lead wire and said stud segment constituting the terminus of said lead wire, inserting the stud segment of said lead wire hook into the opening formed in said filament leg and manipulating the lead wire until the stud segment of the hook is located within the leg and the latter engages the arcuate bend portion of said hook, and then securing said lead wire to a bridge member that is coupled to the other lead wire and thus maintains the filament and lead wires in assembled operative relationship.
References Cited (Backward Citations)
US3069582A
Cited
US3641386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |