CA1060082A - Sheet metal base for pinch sealed electric lamp - Google Patents
Sheet metal base for pinch sealed electric lampInfo
- Publication number
- CA1060082A CA1060082A CA243,175A CA243175A CA1060082A CA 1060082 A CA1060082 A CA 1060082A CA 243175 A CA243175 A CA 243175A CA 1060082 A CA1060082 A CA 1060082A
- Authority
- CA
- Canada
- Prior art keywords
- pinch seal
- base
- end wall
- pinch
- inlead
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
SHEET METAL BASE FOR PINCH SEALED ELECTRIC LAMP
ABSTRACT OF THE DISCLOSURE
A one-piece sheet metal base for a tubular lamp having pinch-sealed ends is adapted to be simply pushed onto the lamp end by hand. It comprises a flat portion having longitudinally extending side wall portions exceeding slight-ly in height the thickness of the pinch seal with inwardly turned underbeveled extensions which resiliently grip the pinch seal for frictional retention. A distal end wall portion has a forwardly turned lip adapted to overlie a pig-tail attached to the inlead. Mitered corners on the under-beveled extensions and on the end wall provide a passage for threading the pigtail through the base.
ABSTRACT OF THE DISCLOSURE
A one-piece sheet metal base for a tubular lamp having pinch-sealed ends is adapted to be simply pushed onto the lamp end by hand. It comprises a flat portion having longitudinally extending side wall portions exceeding slight-ly in height the thickness of the pinch seal with inwardly turned underbeveled extensions which resiliently grip the pinch seal for frictional retention. A distal end wall portion has a forwardly turned lip adapted to overlie a pig-tail attached to the inlead. Mitered corners on the under-beveled extensions and on the end wall provide a passage for threading the pigtail through the base.
Description
~06008Z
The invention relates to metal base terminals for electric lamps and devices having sealed envelopes of vitre-ous material provided with an externally extending flat pinch seal at an end. It is particularly useful with tubular double-ended incandescent lamps and heat lamps of the tungsten halogen cycle kind utilizing fused silica envelopes. In such lamps the inleads generally include extremely thin 1attened ribbon or foil portions which are embedded in and sealed through the wall of the fused silica envelope by collapsing and fusing the silica firmly around the foil in a so-called flat pinch seal. In use/ the lamp is generally supported by accommodating the pinch seals at each end in spring metal support clips ~ich may also serve as current connectors to the inleads.
It has been the general practice up to now to pro-vide a base terminal comprising a thin-walled metal sleeve wrapped and clamped around the pinch seal to facilitate ~
accommodating the pinch seal in the spring support clip. In ~ -one construction the base is connected to the externally projecting portion of the inlead which then serves as a terminal.
In another construction a flexible pigtail is connected to the inlead and the function o the base then is primarily mechanical and decorative. Such base terminals are described in United States patent 2,705,310 issued March 29, 1955 to William F. ~odge, and comprise a flattened metal sleeve which is stretched tightly around the pinch seal by folding or welding together a seam along one side.
The mounting of bases of the foregoing kind on the lamp ends is rather laborious and there is inevitably some shrinkage by cracking of seal during assembly. The - 1- ~F , object of the invention is to provide an improved base struc-ture serviceable also as a terminal, which is low in cost, easily assembled, and reliable in service.
SU~MARY OF THE INVENTION
The invention provides a one-piece sheet metal base for a tubular lamp having a pinch-sealed end which is adapted to be simply pushed onto the lamp end by hand and frictional-ly retained. It comprises a flat portion corresponding ap-proximately in size to the flat side of the pinch seal, lon-gitudinally extending upstanding wall portions on opposite sides exceeding slightly in height the thickness of the pinch seal and having inwardly turned underbeveled extensions which resiliently grip the pinch seal for frictional retention. A
distal end wall portion has a forwardly turned extension or lip adapted to overlie an externally projecting portion of the inlead.
If the function of the base is simply mechanical and decorative, a flexible pigtail is welded to the end of the inlead and the distal end wall then covers up the weld junction. The corners of the underbeveled extensions next the end wall and those of the forwardly turned extension of the end wall are preferably mitered to provide a passage for threading the pigtail through the base. If the base is to serve as a terminal in addition to its mechanical function, the inlead is welded to the distal end wall.
DESCRIPTION OF DRAWING .
~ - -In the drawing wherein like symbols denote cor-responding parts in the several views: ;
FIG. 1 is an exploded perspective view of the ~ -base and the end of the lamp on which it is to be accommo-dated.
.. ' ,. ..
The invention relates to metal base terminals for electric lamps and devices having sealed envelopes of vitre-ous material provided with an externally extending flat pinch seal at an end. It is particularly useful with tubular double-ended incandescent lamps and heat lamps of the tungsten halogen cycle kind utilizing fused silica envelopes. In such lamps the inleads generally include extremely thin 1attened ribbon or foil portions which are embedded in and sealed through the wall of the fused silica envelope by collapsing and fusing the silica firmly around the foil in a so-called flat pinch seal. In use/ the lamp is generally supported by accommodating the pinch seals at each end in spring metal support clips ~ich may also serve as current connectors to the inleads.
It has been the general practice up to now to pro-vide a base terminal comprising a thin-walled metal sleeve wrapped and clamped around the pinch seal to facilitate ~
accommodating the pinch seal in the spring support clip. In ~ -one construction the base is connected to the externally projecting portion of the inlead which then serves as a terminal.
In another construction a flexible pigtail is connected to the inlead and the function o the base then is primarily mechanical and decorative. Such base terminals are described in United States patent 2,705,310 issued March 29, 1955 to William F. ~odge, and comprise a flattened metal sleeve which is stretched tightly around the pinch seal by folding or welding together a seam along one side.
The mounting of bases of the foregoing kind on the lamp ends is rather laborious and there is inevitably some shrinkage by cracking of seal during assembly. The - 1- ~F , object of the invention is to provide an improved base struc-ture serviceable also as a terminal, which is low in cost, easily assembled, and reliable in service.
SU~MARY OF THE INVENTION
The invention provides a one-piece sheet metal base for a tubular lamp having a pinch-sealed end which is adapted to be simply pushed onto the lamp end by hand and frictional-ly retained. It comprises a flat portion corresponding ap-proximately in size to the flat side of the pinch seal, lon-gitudinally extending upstanding wall portions on opposite sides exceeding slightly in height the thickness of the pinch seal and having inwardly turned underbeveled extensions which resiliently grip the pinch seal for frictional retention. A
distal end wall portion has a forwardly turned extension or lip adapted to overlie an externally projecting portion of the inlead.
If the function of the base is simply mechanical and decorative, a flexible pigtail is welded to the end of the inlead and the distal end wall then covers up the weld junction. The corners of the underbeveled extensions next the end wall and those of the forwardly turned extension of the end wall are preferably mitered to provide a passage for threading the pigtail through the base. If the base is to serve as a terminal in addition to its mechanical function, the inlead is welded to the distal end wall.
DESCRIPTION OF DRAWING .
~ - -In the drawing wherein like symbols denote cor-responding parts in the several views: ;
FIG. 1 is an exploded perspective view of the ~ -base and the end of the lamp on which it is to be accommo-dated.
.. ' ,. ..
- 2 -FIG. 2 is a perspective view of a similar base mounted on the opposite end of the lamp.
FIG. 3 illustrates a variant wherein the base serves as electrical terminal DETAILED DESCRIPTION
Referring to the drawing, there are shown the ends of an electric liamp comprising a tubular elongated vitreous envelope 1 through which extends a tungsten fila~
~ ment 2 connected at opposite ends to inlead conductors 3 having intermediate foil sections 4 hermetically sealed through the vitreous material of the envelope in flattened ;
pinch seals 5. In an incandescent lamp for illumination purposes, the envelope is generally made of clear, fused sllica. For heat Lamps or sealed in~rared heatersj cheap-~15 er translucent fused silica is commonly used. Quartz-like glasses and other high temperature glasses may be substituted for fused silica in applications of low~r heat stress.
The base 6 (or 6') according to the invention, -- comprise~ a single piece of thin sheet material, suitably stainless steel~ of which the main part is a flat portion 7 corresponding in size to the substantially flat pinch .. .
sea1. Ex~endin~g longitudinally along opposite sides of the flat portion are upstanding wall portions 8 exceeding slightly in height the thickness of the pinch seal and ~25 - having inwardly turned extensions 9 which are bent down or downwardly inclined in order to resiliently grip the pinch `-seal. In the preferred embodiment illustrated, the t~rned over portions 9 form under~eveled rails angled down toward j ~- the flat portion 7 of the base and adapted to frictionally engage the pinch seal. An end wall portion 10 of less .
height than the thickness of the pinch seal is provided at ..
_3_ ., , 106008Z l.D (~ 0~15 the distal or outer end of the base. It includes a forward-ly turned portion or lip ll adapted to abut the end of the pinch seal and overlie the externally projecting portion 12 of the înlead conductor 3.
The end wall lO does not extend the full width of the base whereby a gap or opening is left in each corner which allows the egress of a flexible wire or pigtail 13 welded to inlead portion 12 to serve as a circuit connector.
The rear corners of rails 9 are mitered at 14 as are also 0 the corners of end wall lip ll at 15. The gap between the mitered edges serves as a passage through which pigtail 13, turned up as shown in FIG. l, may be threaded when the base is pushed onto the end of the lamp.
Pinch se~ls may vary s,lightly in si e due to such -.1 .
variables as tolerance~ in wall thickness of the original fused silica tubing, the intensity setting of the sealing fires, and th:e adjustment of the pinching jaws on the pinch sealing machi~e. It is desirable to pinch the lamp end be- -1 tween confined jaws so that the width of the pinch is in--~ variant. Accordingly the flat portion of the base is di-~i~ mensioned to accommodate the width of the pinch between the : wall8 8. Since the pinch width is a constant, tolerances in silica wall thickness become variations in pinch thickness.
! ~- ` To accommodate such variations, wall portions 8 have a ~-height exceeding the thicXest pinch seal which the toler-~; ances permit. ~The underbeveled rails 9 are made wide enough ,~ and angled down so as to frictionally engage the thinnest pinch seal which the tolerances permit. The partial miter or rounding of the front corners of the rails at 16 is de-sirable to facilitate the initial upward flexing of the rails when pushing the base onto the pinch seal.
~ . !
The functions of base 6 illustrated in FIGS. 1 and 2 are primarily mechanical and decorative. It facili-tates engage~ent of the lamp ends in the metal support clips of the fixture~ The manufacturer's name or trademark may be embossed or printed on the outside of flat portion 7 along -with the lamp designation or rating, and the base gives a finished appearance to the lamp. The distal end wall portion 10 serves as a shield over any sharp ends and covers the un-sightly weld ~Jhere pigtail 13 is joined to inlead portion 12 FIG. 3 illustrates a variant o the invention where-in base 6' serves as electrical terminal in addition to its other functions. A central aperture is provided wi~hin end ....
wall 10 and external portion 12 of the inlead is cut slight- . -: :
ly longer s~ as to project through the aparture. After-the i 15 base is slipped over the pinch seal, the projecting portion of the inlead is welded to the distal end wall at-17 so as to make a low resistance connection. In this arrangement base 6' serves as tha electrical terminal and the pigtail , is eliminated.
20 ~ The im~roved base according to the invention is readily pushed onto the pinch seal of electric lamps by hand, and manufacturing experience shows that shrinkage from the mounting operation is substantially eliminated.
The foregoing description of preferred species is intended as illustrative of the invention only~ and -the base and terminal structure may be modified within .
, the spirit of the invention. I
,, ~ ,.
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, . .
.
., , .
. .
.
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FIG. 3 illustrates a variant wherein the base serves as electrical terminal DETAILED DESCRIPTION
Referring to the drawing, there are shown the ends of an electric liamp comprising a tubular elongated vitreous envelope 1 through which extends a tungsten fila~
~ ment 2 connected at opposite ends to inlead conductors 3 having intermediate foil sections 4 hermetically sealed through the vitreous material of the envelope in flattened ;
pinch seals 5. In an incandescent lamp for illumination purposes, the envelope is generally made of clear, fused sllica. For heat Lamps or sealed in~rared heatersj cheap-~15 er translucent fused silica is commonly used. Quartz-like glasses and other high temperature glasses may be substituted for fused silica in applications of low~r heat stress.
The base 6 (or 6') according to the invention, -- comprise~ a single piece of thin sheet material, suitably stainless steel~ of which the main part is a flat portion 7 corresponding in size to the substantially flat pinch .. .
sea1. Ex~endin~g longitudinally along opposite sides of the flat portion are upstanding wall portions 8 exceeding slightly in height the thickness of the pinch seal and ~25 - having inwardly turned extensions 9 which are bent down or downwardly inclined in order to resiliently grip the pinch `-seal. In the preferred embodiment illustrated, the t~rned over portions 9 form under~eveled rails angled down toward j ~- the flat portion 7 of the base and adapted to frictionally engage the pinch seal. An end wall portion 10 of less .
height than the thickness of the pinch seal is provided at ..
_3_ ., , 106008Z l.D (~ 0~15 the distal or outer end of the base. It includes a forward-ly turned portion or lip ll adapted to abut the end of the pinch seal and overlie the externally projecting portion 12 of the înlead conductor 3.
The end wall lO does not extend the full width of the base whereby a gap or opening is left in each corner which allows the egress of a flexible wire or pigtail 13 welded to inlead portion 12 to serve as a circuit connector.
The rear corners of rails 9 are mitered at 14 as are also 0 the corners of end wall lip ll at 15. The gap between the mitered edges serves as a passage through which pigtail 13, turned up as shown in FIG. l, may be threaded when the base is pushed onto the end of the lamp.
Pinch se~ls may vary s,lightly in si e due to such -.1 .
variables as tolerance~ in wall thickness of the original fused silica tubing, the intensity setting of the sealing fires, and th:e adjustment of the pinching jaws on the pinch sealing machi~e. It is desirable to pinch the lamp end be- -1 tween confined jaws so that the width of the pinch is in--~ variant. Accordingly the flat portion of the base is di-~i~ mensioned to accommodate the width of the pinch between the : wall8 8. Since the pinch width is a constant, tolerances in silica wall thickness become variations in pinch thickness.
! ~- ` To accommodate such variations, wall portions 8 have a ~-height exceeding the thicXest pinch seal which the toler-~; ances permit. ~The underbeveled rails 9 are made wide enough ,~ and angled down so as to frictionally engage the thinnest pinch seal which the tolerances permit. The partial miter or rounding of the front corners of the rails at 16 is de-sirable to facilitate the initial upward flexing of the rails when pushing the base onto the pinch seal.
~ . !
The functions of base 6 illustrated in FIGS. 1 and 2 are primarily mechanical and decorative. It facili-tates engage~ent of the lamp ends in the metal support clips of the fixture~ The manufacturer's name or trademark may be embossed or printed on the outside of flat portion 7 along -with the lamp designation or rating, and the base gives a finished appearance to the lamp. The distal end wall portion 10 serves as a shield over any sharp ends and covers the un-sightly weld ~Jhere pigtail 13 is joined to inlead portion 12 FIG. 3 illustrates a variant o the invention where-in base 6' serves as electrical terminal in addition to its other functions. A central aperture is provided wi~hin end ....
wall 10 and external portion 12 of the inlead is cut slight- . -: :
ly longer s~ as to project through the aparture. After-the i 15 base is slipped over the pinch seal, the projecting portion of the inlead is welded to the distal end wall at-17 so as to make a low resistance connection. In this arrangement base 6' serves as tha electrical terminal and the pigtail , is eliminated.
20 ~ The im~roved base according to the invention is readily pushed onto the pinch seal of electric lamps by hand, and manufacturing experience shows that shrinkage from the mounting operation is substantially eliminated.
The foregoing description of preferred species is intended as illustrative of the invention only~ and -the base and terminal structure may be modified within .
, the spirit of the invention. I
,, ~ ,.
, . 1, _5_ ` I
, . .
.
., , .
. .
.
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Claims (10)
1. A sheet metal base for a vitreous lamp en-velope containing electric energy translation means and having a flat pinch seal at one end through which an in-lead conductor connected to said translation means has a portion projecting externally, said base comprising:
a flat portion corresponding approximately in size to the flat side of said pinch seal, longitudinally extending side wall portions exceeding in height the thickness of said pinch seal and having inwardly turned and downwardly inclined extensions adapted to resiliently en-gage the pinch seal, and a distal end wall adapted to overlie the externally projecting portion of said inlead.
a flat portion corresponding approximately in size to the flat side of said pinch seal, longitudinally extending side wall portions exceeding in height the thickness of said pinch seal and having inwardly turned and downwardly inclined extensions adapted to resiliently en-gage the pinch seal, and a distal end wall adapted to overlie the externally projecting portion of said inlead.
2. A base as in claim 1 wherein the inwardly turned extensions of the side walls form underbeveled rails angled down to frictionally engage the pinch seal.
3. A base as in claim 1 wherein the distal end wall has a forwardly turned lip adapted to abut the end of the pinch seal.
4. A base as in claim 1 wherein the inwardly turned extensions of the side walls form underbeveled rails angled down to frictionally engage the pinch seal, and the distal end wall is of less height than the thickness of the pinch seal and has a forwardly turned lip adapted to abut the end of the pinch seal.
5. A base as in claim 4 wherein the end wall is narrower than the width of the base and gaps are left in the corners between the rails of the side walls and the lip of the end wall through which a pigtail attached to the externally projecting portion of the inlead may be threaded while pushing said base onto the pinch seal of a lamp.
6. A base as in claim 5 wherein the forward corners of the rails are mitered or rounded to facilitate initial upward flexing of the rails when pushing the base onto the pinch seal of a lamp.
7. In combination, an electric lamp comprising a vitreous lamp envelope containing electric energy trans-lation means and having a flat pinch seal at one end through which an inlead conductor connected to said translation means has a portion projecting externally, and a one-piece sheet metal base comprising a flat portion corresponding approximately in size to the flat side of said pinch seal, longitudinally extending upstanding wall portions on opposite sides of the flat portion exceeding in height the thickness of said pinch seal, said wall portions having inwardly turned underbeveled rails which resiliently and fric-tionally engage the pinch seal, and an upstanding distal end wall portion having a forwardly turned lip overlying the externally projecting portion of said inlead.
8. A combination as in claim 7 wherein the distal end wall portion is of less height than the thickness of the pinch seal and its forwardly turned lip abuts the end of the pinch seal.
9. A combination as in claim 7 wherein a pigtail connector is fastened to the externally projecting portion of the inlead, and adjacent corners of side wall rail and end wall lip are mitered to provide a threading passage for said pigtail.
10. A combination as in claim 6 wherein the end wall portion is apertured and the end of the externally projecting portion of the inlead projects therethrough and is welded to said end wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA243,175A CA1060082A (en) | 1976-01-08 | 1976-01-08 | Sheet metal base for pinch sealed electric lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA243,175A CA1060082A (en) | 1976-01-08 | 1976-01-08 | Sheet metal base for pinch sealed electric lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1060082A true CA1060082A (en) | 1979-08-07 |
Family
ID=4104929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA243,175A Expired CA1060082A (en) | 1976-01-08 | 1976-01-08 | Sheet metal base for pinch sealed electric lamp |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1060082A (en) |
-
1976
- 1976-01-08 CA CA243,175A patent/CA1060082A/en not_active Expired
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