METHOD FOR PRODUCING A MULTIPLE FILAMENTED CARTRIDGE LAMP
United States Patent 3791710
A method for producing multiple filamented cartridge lamps is disclosed. The multiple filaments are connected together on the external ends of a cartridge lamp by linking members and then the ends of the lamp are press sealed. Thereafter, a linking member is separated externally on at least one end to form separate terminals for each filament whereby each filament can have a separate source of energy.
US Patent References:
SINGLE-ENDED INCANDESCENT PROJECTION LAMP HAVING DUAL SERIES-CONNECTED FILAMENTS AND AN INTEGRAL GRIPPING CAP
McFall - January 1971 - 3555342
Electrode starting arrangement having a coiled heating element connected to the retroverted portion of the electrode
Decker et al. - December 1967 - 3356884
Manufacture of electric incandescent lamps
Ayres et al. - December 1966 - 3295016
Baseless double-ended electric incandescent lamp
Peziosi et al. - August 1966 - 3265923
Electric incandescent lamps
Vause et al. - November 1966 - 3286118
SINGLE-ENDED INCANDESCENT PROJECTION LAMP HAVING DUAL SERIES-CONNECTED FILAMENTS AND AN INTEGRAL GRIPPING CAP
McFall - January 1971 - 3555342
Electrode starting arrangement having a coiled heating element connected to the retroverted portion of the electrode
Decker et al. - December 1967 - 3356884
Manufacture of electric incandescent lamps
Ayres et al. - December 1966 - 3295016
Baseless double-ended electric incandescent lamp
Peziosi et al. - August 1966 - 3265923
Electric incandescent lamps
Vause et al. - November 1966 - 3286118
Application Number:
05/237847
Publication Date:
02/12/1974
Filing Date:
03/24/1972
View Patent Images:
Export Citation:
Assignee:
Wagner Electric Corporation (Newark, NJ)
Primary Class:
Other Classes:
313/316, 445/32
International Classes:
H01K3/00; H01J9/00
Field of Search:
29/25.16 316/17,18,19 313/316,318,222,243,271,272,273,274,284,285,286
US Patent References:
| 3496403 | SINGLE-ENDED ELECTRIC INCANDESCENT LAMP AND MOUNT ASSEMBLY THEREFOR | February 1970 | Palermo et al. |
Primary Examiner:
Lake, Roy
Assistant Examiner:
Davie J. W.
Attorney, Agent or Firm:
Eyre, Mann & Lucas
Claims:
I claim
1. A process for manufacturing multiple filamented lamps wherein at least one filament can be operated independently of the others comprising:
2. The process of claim 1 wherein the linking members are severed at both ends of the sealed lamp assembly to provide separate terminals for each filament.
3. The process of claim 1 wherein only one of the linking members is severed and further including the step of placing a cap on the end of the lamp with the non-severed linking member.
4. The process of claim 1 wherein one end of the lamp case is press sealed before flushing.
5. The process of claim 1 wherein flushing is begun before either end of the lamp case has been press sealed.
6. The process of claim 1 wherein flushing is begun before press sealing of either end, one end of the lamp is press sealed, and flushing is continued until the instant of the seal of the other end.
1. A process for manufacturing multiple filamented lamps wherein at least one filament can be operated independently of the others comprising:
2. The process of claim 1 wherein the linking members are severed at both ends of the sealed lamp assembly to provide separate terminals for each filament.
3. The process of claim 1 wherein only one of the linking members is severed and further including the step of placing a cap on the end of the lamp with the non-severed linking member.
4. The process of claim 1 wherein one end of the lamp case is press sealed before flushing.
5. The process of claim 1 wherein flushing is begun before either end of the lamp case has been press sealed.
6. The process of claim 1 wherein flushing is begun before press sealing of either end, one end of the lamp is press sealed, and flushing is continued until the instant of the seal of the other end.
Description:
The present invention is a new and useful method for producing a multiple filamented cartridge-type lamp and is especially useful for producing a two filamented lamp. The two filaments are joined together by a "U" shaped linking member at each end whereby the two filaments will be held in spaced relation to each other during the subsequent forming of the lamp. The joined filaments are placed inside the lamp with the linking members extending external thereto. The lamp is then exhausted by the flush method and an instantaneous press seal is applied to each end of the lamp. If desired, one end of the lamp can be press sealed before flushing and the other after flushing. Thereafter, the linking member is separated on at least one end of the lamp whereby each filament may be operated separately with a common ground. Alternatively, the linking members may be separated at both ends and each filament can be used in a completely separate circuit. The lamps have particular application in the automotive industry as combination stop and tail lights or combination tail light and turn signal light.
The lamps formed by the present invention have considerable advantage over the prior art since the filaments are linked together during the formation of the lamp and it is not necessary to hold them separately by the application of external holding means. This is a simple and comparatively low cost method of making multiple filamented lamps.
These and other aspects of the present invention may be more fully understood with reference to the drawings in which:
FIG. 1 shows a multiple filament assembly formed in accordance with the present invention before insertion into the lamp case;
FIG. 2 shows a two filament assembly press sealed in a glass bulb;
FIG. 3 shows the two filament assembly in the lamp of FIG. 2 with one set of terminal posts and a common ground;
FIG. 4 shows the two filament assembly in the lamp of FIG. 2 with two sets of terminal posts each independent; and
FIG. 5 shows the lamp assembly of FIG. 3 with a cap on the common end thereof.
In FIG. 1 is shown three filaments 10, 11 and 12 linked in accordance with the present invention before insertion into the lamp case, usually a glass bulb. The filaments 10, 11 and 12 have lead-in wires 14, 15, 16, 17, and 18, 20 respectively and the filaments are suitably joined to the lead-in wires by folding over tabs on the lead-in wires as shown. The lead-in wires 14, 16, 18 are joined at one end suitably by welding to linking member 22 and lead-in wires 15, 17, 20 are joined at the other end by linking member 23. The linking members 22 and 24 are preferably made of either nickel or Kovar. Kovar is a Westinghouse tradename for a sealing alloy consisting of iron, nickel and chromium. The lead-in wires 14, 15, 16, 17, 18 and 20 are suitably made of dumet or Kovar which are sealing alloys. Dumet is a generic name for a sealing metal for soft glass consisting of an alloy of nickel and iron usually covered by a sleeve of copper which in turn is covered with a nickel plate or a borated surface and is available from General Electric, Westinghouse, Sylvania and Texas Instruments. The particular sealing alloy is dependent upon the material used for the envelop; usually dumet when soda lime glass is used and Kovar when heat resistant glass is used such as Corning 7052 or 7056. The filaments 11, 10 and 12 are suitably made of tungsten.
In FIG. 2 there is shown a two filament assembly similar to the three filament assembly of FIG. 1 encased within a glass envelop 26. The linking members 24 and 25 are similar to linking members 22 and 23 except that provision is made for connecting only two filaments. The filaments shown in FIG. 2 are connected to the linking members in the same manner shown and described for FIG. 1. The envelop has been heated at its ends and press sealed in standard manner at 28 and 30. Before sealing at the second end, the lamp was exhausted by the flush method, preferably with nitrogen or argon or any other suitable inert gas. In the preferred embodiment of the invention soda lime glass is used for the bulb, the sealing alloy is nickel plated dumet and the linking member is nickel.
After the two filament assembly has been sealed in the bulb, the linking member 24 is separated as shown in FIG. 3 so that separate terminals 32 and 34 are provided at one end of the bulb. With this construction, the linking member 25 can serve as a ground and separate signals can be fed to terminals 32 and 34. An alternative form of construction is shown in FIG. 4 wherein both linking members 24 and 25 have been severed, forming terminals 32, 34 and 36, 38. With this construction, the filament with terminals 34, 36 can have a completely separate supply from the filament with terminals 32, 38.
In the embodiment of FIG. 3, the end 40 of the lamp may be provided with a standard metal cap 42 as shown in FIG. 5. While this is desirable, it is not necessary.
It will be understood that the claims are intended to cover all changes and modifications of the preferred embodiments of the invention, herein chosen for the purpose of illustration, which do not constitute departures from the spirit and scope of the invention.
The lamps formed by the present invention have considerable advantage over the prior art since the filaments are linked together during the formation of the lamp and it is not necessary to hold them separately by the application of external holding means. This is a simple and comparatively low cost method of making multiple filamented lamps.
These and other aspects of the present invention may be more fully understood with reference to the drawings in which:
FIG. 1 shows a multiple filament assembly formed in accordance with the present invention before insertion into the lamp case;
FIG. 2 shows a two filament assembly press sealed in a glass bulb;
FIG. 3 shows the two filament assembly in the lamp of FIG. 2 with one set of terminal posts and a common ground;
FIG. 4 shows the two filament assembly in the lamp of FIG. 2 with two sets of terminal posts each independent; and
FIG. 5 shows the lamp assembly of FIG. 3 with a cap on the common end thereof.
In FIG. 1 is shown three filaments 10, 11 and 12 linked in accordance with the present invention before insertion into the lamp case, usually a glass bulb. The filaments 10, 11 and 12 have lead-in wires 14, 15, 16, 17, and 18, 20 respectively and the filaments are suitably joined to the lead-in wires by folding over tabs on the lead-in wires as shown. The lead-in wires 14, 16, 18 are joined at one end suitably by welding to linking member 22 and lead-in wires 15, 17, 20 are joined at the other end by linking member 23. The linking members 22 and 24 are preferably made of either nickel or Kovar. Kovar is a Westinghouse tradename for a sealing alloy consisting of iron, nickel and chromium. The lead-in wires 14, 15, 16, 17, 18 and 20 are suitably made of dumet or Kovar which are sealing alloys. Dumet is a generic name for a sealing metal for soft glass consisting of an alloy of nickel and iron usually covered by a sleeve of copper which in turn is covered with a nickel plate or a borated surface and is available from General Electric, Westinghouse, Sylvania and Texas Instruments. The particular sealing alloy is dependent upon the material used for the envelop; usually dumet when soda lime glass is used and Kovar when heat resistant glass is used such as Corning 7052 or 7056. The filaments 11, 10 and 12 are suitably made of tungsten.
In FIG. 2 there is shown a two filament assembly similar to the three filament assembly of FIG. 1 encased within a glass envelop 26. The linking members 24 and 25 are similar to linking members 22 and 23 except that provision is made for connecting only two filaments. The filaments shown in FIG. 2 are connected to the linking members in the same manner shown and described for FIG. 1. The envelop has been heated at its ends and press sealed in standard manner at 28 and 30. Before sealing at the second end, the lamp was exhausted by the flush method, preferably with nitrogen or argon or any other suitable inert gas. In the preferred embodiment of the invention soda lime glass is used for the bulb, the sealing alloy is nickel plated dumet and the linking member is nickel.
After the two filament assembly has been sealed in the bulb, the linking member 24 is separated as shown in FIG. 3 so that separate terminals 32 and 34 are provided at one end of the bulb. With this construction, the linking member 25 can serve as a ground and separate signals can be fed to terminals 32 and 34. An alternative form of construction is shown in FIG. 4 wherein both linking members 24 and 25 have been severed, forming terminals 32, 34 and 36, 38. With this construction, the filament with terminals 34, 36 can have a completely separate supply from the filament with terminals 32, 38.
In the embodiment of FIG. 3, the end 40 of the lamp may be provided with a standard metal cap 42 as shown in FIG. 5. While this is desirable, it is not necessary.
It will be understood that the claims are intended to cover all changes and modifications of the preferred embodiments of the invention, herein chosen for the purpose of illustration, which do not constitute departures from the spirit and scope of the invention.