GB2042823A - Base sleeve for an electric bulb - Google Patents
Base sleeve for an electric bulb Download PDFInfo
- Publication number
- GB2042823A GB2042823A GB8000687A GB8000687A GB2042823A GB 2042823 A GB2042823 A GB 2042823A GB 8000687 A GB8000687 A GB 8000687A GB 8000687 A GB8000687 A GB 8000687A GB 2042823 A GB2042823 A GB 2042823A
- Authority
- GB
- United Kingdom
- Prior art keywords
- base
- bulb
- sleeve
- base sleeve
- pinch
- 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.)
- Granted
Links
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 238000005755 formation reaction Methods 0.000 claims abstract description 7
- 239000004568 cement Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005476 soldering Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/42—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp
- H01K1/46—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp supported by a separate part, e.g. base, cap
Landscapes
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
- Fastening Of Light Sources Or Lamp Holders (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
A base sleeve for an electric bulb. for receiving a pinch base (8) of the bulb (7), the base sleeve being of generally circular cross section and having on its open side two strip- shaped formations (1) which are stamped from the circular edge of the sleeve, the formations serving for bearing resiliently against the narrow sides of the pinch base (8) of the bulb (7), so as to retain the bulb (7) in a fixed position. <IMAGE>
Description
SPECIFICATION
Base sleeve for an electric bulb
The invention relates to a base sleeve for an electric bulb, more particularly for a motor vehicle bulb.
Electric bulbs are known, more particularly for motor vehicles, in which a bulb envelope of quartz or a highmelting glass has an external diameter which is smaller than the internal diameter of the associated base sleeve and terminates in a pinch base from which the lead-in wires extend which are attached to the bottom of the base sleeve.
There are various known ways of dealing with the consequent problem of attaching the pinch base, with its regular cross-section, in a base sleeve of round cross-section, such attachment generally being performed not coaxially, but with some lateral offsetting.
The usual solution to this problem is to fill the intermediate space between the pinch base and the base sleeve with cement. However, this solution to the problem, conventionally used in electric bulb technique, has considerable disadvantages, such as a large amount of cement, long baking-out times, high temperature loading of the cement when the lamp is switched on, resulting in the undesirable vaporizing-out of components of the cement, and the heavy demands made on the quality of the cement. As a result of these disadvantages, it has become desirable to provide a solution to the problem, allowing the bulb to the mounted in the sleeve without the use of cement.
Each of the various known constructions employed to soive the problem requires one or more base parts in addition to the cement-filled base sleeve; see for example German
Offenlegungsschrift No. 2318580 and German
Auslegeschrift No. 257208, in which it is proposed for the base to be enclosed partial!y or over its whole length by an additionai sleeve. The sleeves are either fitted resiliently into the round base sleeve or attached to a round cover which forms the closure of the base sleeve or round cross-section. The lead-in wires extending out of the pinch base pass through corresponding holes in an insulating block which forms the bottom of the base sleeve.
The known cementless bases achieve the required advantages over the bases using cement but the manufacture of the known cementless bases requires considerable expenditure for material and extra labour, due to the necessity of using complicatedly bent metal parts. The assembly and welding or soldering of the individual parts make heavy technological demands in serial production and are very costly.
It is an object of the invention to provide a base sleeve for a cementless base which ensures that the bulb is held securely without additional material, and without increase in manufacturing costs.
The invention consists in a base sleeve for an electric bulb, for receiving a pinch foot of the bulb, the base sleeve being of generally circular crosssection and having on its open side two stripshaped formations which are stamped from the circular edge of the sleeve, the strip-shaped formations serving for bearing resiliently against the narrow sides of the pinch base of the bulb so as to retain the bulb in a fixed position in the base sleeve.
The bulb is attached atthe place of transition from the cylindrical bulb envelope, to the pinch base and the strip-shaped formations afford security against lateral displacement. The bulb is further retained by soldering the lead-in wires extending out of the pinch base, into the insulating block at the bottom of the base sleeve. Due to the fact that the edge of the sleeve is designed with a relatively large radius of curvature and is not adopted to the shape of the pinch base, the engagement is against the narrow sides of the pinch base, so that larger manufacturing tolerances can be permitted in its shaping. The connections, produced by soldering a baseplate and/or a base cover onto the base sleeve, are adjacent the deformed base edge and extend in a circle over the majority of its periphery.As a result due to the considerable stability of shape of the complete base, it is unlikely for the base edge to become accidentally deformed, resulting in the displacement or loosening of the bulb in the base sleeve.
In order to make the invention clearly
understood, reference will now be made to the accompanying drawings which are given by way
of example and in which: Fig. 1 is a perspective view of a base sleeve, and Fig. 2 is a side elevation of the base sleeve with a bulb shown attached therein.
Figs, 1 and 2 show a cylindrical base sleeve having an insulating block 2 and contact lugs 3.
The insulating block is formed with holes 4 for lead-in wires 6 which extend out of the pinch base 8 of a bulb 7. Two opposite segments are cut horizontally into the generated surface of the base sleeve at least 2 mm below the top edge. Straps 1 formed by the pressing-in of the segments serve for resiliently bearing against the narrow sides of the pinch base 8 of the bulb 7. The stability of the retaining means is ensured by the undulating shape of the straps 1. For further stabilization, the narrow sides of the pinch base 8 may be provided with projections (not shown) bearing against the straps 1. To assemble the parts, the base sleeve and bulb are forced against one another in the axial direction, so that the narrow sides of the pinch base 8 bear firmly against the straps 1 at the transition to the cylindrical part of the bulb 7. Then the contact lugs 3 are soldered to the lead-in wires 6.
In the subsequent adjusting operation, to complete the base, a base cover and baseplate are soldered on to the base sleeve. The base arrangement described is intended more particularly for two-wire motor vehicle lamps.
Claims (4)
1. A base sleeve for an electric bulb, for receiving a pinch foot of the bulb, the base sleeve being of generally circular cross-section and having on its open side two strip-shaped formations which are stamped from the circular edge of the sleeve, the strip-shaped formations serving for bearing resiliently against the narrow sides of the pinch base of the bulb so as to retain the bulb in a fixed position in the base sleeve.
2. An electric bulb having a base sleeve as claimed in claim 1.
3. A base sleeve for an electric bulb substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
4. An electric bulb substantially as hereinbefore described with reference to and as illustrated in
Fig. 2 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD79210435A DD140817B1 (en) | 1979-01-11 | 1979-01-11 | SOCKET HOOKS FOR ELECTRIC LIGHT BULBS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2042823A true GB2042823A (en) | 1980-09-24 |
| GB2042823B GB2042823B (en) | 1983-04-13 |
Family
ID=5516346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8000687A Expired GB2042823B (en) | 1979-01-11 | 1980-01-09 | Base sleeve for an electric bulb |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS6114131Y2 (en) |
| DD (1) | DD140817B1 (en) |
| DE (1) | DE7934879U1 (en) |
| GB (1) | GB2042823B (en) |
| IT (1) | IT1146901B (en) |
| NL (1) | NL7909008A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0292945A2 (en) * | 1987-05-25 | 1988-11-30 | Kabushiki Kaisha Toshiba | Low-pressure discharge lamp |
| EP0396910A2 (en) * | 1989-05-09 | 1990-11-14 | Paul Albrecht | Base for a small incandescent lamp |
| EP1006551A2 (en) * | 1998-12-01 | 2000-06-07 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Electric lamp |
| EP1026722A1 (en) * | 1999-02-08 | 2000-08-09 | Matsushita Electronics Corporation | Fluorescent lamp |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3221290A1 (en) * | 1982-06-05 | 1983-12-08 | Philips Patentverwaltung Gmbh, 2000 Hamburg | ELECTRIC LAMP WITH A SOCKET-BASED BASE |
-
1979
- 1979-01-11 DD DD79210435A patent/DD140817B1/en not_active IP Right Cessation
- 1979-12-12 DE DE19797934879U patent/DE7934879U1/en not_active Expired
- 1979-12-13 NL NL7909008A patent/NL7909008A/en not_active Application Discontinuation
-
1980
- 1980-01-09 GB GB8000687A patent/GB2042823B/en not_active Expired
- 1980-01-10 IT IT47564/80A patent/IT1146901B/en active
- 1980-01-11 JP JP1980001257U patent/JPS6114131Y2/ja not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0292945A2 (en) * | 1987-05-25 | 1988-11-30 | Kabushiki Kaisha Toshiba | Low-pressure discharge lamp |
| EP0292945A3 (en) * | 1987-05-25 | 1990-12-27 | Kabushiki Kaisha Toshiba | Low-pressure discharge lamp |
| EP0396910A2 (en) * | 1989-05-09 | 1990-11-14 | Paul Albrecht | Base for a small incandescent lamp |
| EP0396910A3 (en) * | 1989-05-09 | 1991-02-06 | Paul Albrecht | Base for a small incandescent lamp |
| EP1006551A2 (en) * | 1998-12-01 | 2000-06-07 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Electric lamp |
| EP1006551A3 (en) * | 1998-12-01 | 2000-06-14 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Electric lamp |
| US6244737B1 (en) | 1998-12-01 | 2001-06-12 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh | Electric lamp |
| EP1026722A1 (en) * | 1999-02-08 | 2000-08-09 | Matsushita Electronics Corporation | Fluorescent lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7909008A (en) | 1980-07-15 |
| GB2042823B (en) | 1983-04-13 |
| DD140817B1 (en) | 1987-10-14 |
| JPS6114131Y2 (en) | 1986-05-01 |
| IT8047564A0 (en) | 1980-01-10 |
| JPS55114163U (en) | 1980-08-12 |
| IT1146901B (en) | 1986-11-19 |
| DD140817A1 (en) | 1980-03-26 |
| DE7934879U1 (en) | 1980-04-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |