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US3858086A - Extended life, double coil incandescent lamp - Google Patents

Extended life, double coil incandescent lamp Download PDF

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Publication number
US3858086A
US3858086A US41087873A US3858086A US 3858086 A US3858086 A US 3858086A US 41087873 A US41087873 A US 41087873A US 3858086 A US3858086 A US 3858086A
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Prior art keywords
lamp
wire
coil
switch
filament
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Expired - Lifetime
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E Passmore
W Anderson
W Labadini
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GTE Sylvania Inc
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GTE Sylvania Inc
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01KELECTRIC INCANDESCENT LAMPS
    • H01K1/00Details
    • H01K1/62One or more circuit elements structurally associated with the lamp

Abstract

An electric incandescent lamp has a refractory metal wire coil in series with the lamp filament in order to limit inrush current to the filament. After a short period of lamp operation, a bimetallic switch shorts out the wire coil.

Description

United States Patent [191 Anderson et al.

[451 Dec. 31, 1974 EXTENDED LIFE, DOUBLE COIL INCANDESCENT LAMP Inventors: Warren A. Anderson, Danvers;

William M. Labadini, Salisbury; Edmund M. Passmore, Wilmington, all of Mass.

GTE Sylvania Incorporated, Danvers, Mass.

Filed: Oct. 29, 1973 Appl. No.: 410,878

Assignee:

US. Cl 315/49, 313/316, 315/47, 315/67, 315/74, 315/100 Int. Cl. H01j 7/44, H01j 13/46, H01j 17/34 Field of Search 313/341, 316; 315/46, 47, 315/49, 50, 67, 73, 74, 100, 104

References Cited UNITED STATES PATENTS 11/1935 Pirani et al. 315/49 2,235,360 3/1941 Davis, Jr. 315/67 X 2,263,171 11/1941 Hays, Jr. et al 315/47 2,313,683 3/1943 Thayer 315/49 X 2,756,382 7/1956 Wuerth 315/104 X 3,138,737 6/1964 French 315/50 3,227,920 l/l966 Peek, Jr. et a1 315/66 3,382,403 5/1968 Lloyd 315/73 X 3,435,286 3/1969 Kayatt 315/50 X Primary E.\'aminerArchie R. Borchelt Assistant ExaminerSaxfield Chatmon, Jr. Attorney, Agent, or Firm-James Theodosopoulos [57] ABSTRACT An electric incandescent lamp has a refractory metal wire coil in series with the lamp filament in order to limit inrush current to the filament. After a short period of lamp operation, a bimetallic switch shorts out the wire coil.

5 Claims, 2 Drawing Figures EXTENDED LIFE, DOUBLE COIL INCANDESCENT LAMP THE INVENTION Electric incandescent lamps generally comprise a coiled tungsten filament disposed within a glass envelope. The lamp emits light when the filament is heated to incandescence by the passage of electric current therethrough.

The electrical resistance of the tungsten filament is greatly dependent on its temperature. For example, the resistance of the hot filament, during normal operation, can be about ten or more times greater than its resistance at room temperature. One result of this resistance change is that the filament is subjected to a large inrush current when the lamp is first energized. For example, in a 100 watt, 120 volt lamp, the inrush current is greater than 12 amperes; the current then decreases to a steady-state value of 0.833 amperes, after a few milliseconds, as the tungsten filament is heated to its normal operating temperature;

The high inrush current causes localized overheating of the filament and is a major cause of premature lamp failure. It is an object of this invention to prevent high inrush current, thereby significantly increasing the useful life of the lamp.

FIG. 1 in the drawing is an elevational view, partly in section, of an electric incandescent lamp in accordance with this invention.

FIG. 2 is an expanded view of the switch and wire coil of FIG. 1.

The lamp comprises a glass bulb 1 usually having a gaseous filling therein, such as argon and nitrogen. The bottom of bulb l is sealed to flare 2 of the usual stem press glass mount 10. Lead-in wires 3 and 9 extend through and are supported by stem press 4 of glass mount 10. Also supported in stem press 4 is a dummy support wire 11 which extends upwardly into bulb 1. A coiled tungsten filament 5 is supported between the upper end of support wire 11 and lead-in wire 3. Fastened to the lower portion of support wire 11 is another support wire 12 to which are attached one end of refractory wire coil 13 and one end of U-shaped bimetal switch 14. The other end of coil 13 is connected to lead-in wire 9 while the other end of switch 14, when closed, makes electrical contact with rod fastened to lead-in wire 9. Switch 14 is normally open at room temperature, that is, when the lamp is cold or unenergized, as shown in the drawing.

Lead-in wires 9 and 3 extend downward between tipped off exhaust tube 6 and flare 2 and are connected respectively, to the usual screw base 8, which is fastened to the bottom of bulb l, and to center contact 7 of base 8.

When the lamp is first energized, current flows through filament 5 and coil 13, which are in series with each other. Thus, even though the resistance of filament 5 is quite low, the inrush current is limited by coil 13. In one example of a 100 watt, 120 volt lamp in accordance with this invention, filament 5 consisted of a coiled coil of 2.55 mil tungsten wire having a total wire length of 575 mm and a body length of 22 mm. Coil 13 consisted of a coiled coil of 2.45 mil tungsten wire having a total wire length of 610 mm and a body length of 22 mm. The cold resistance of coil 13 was 11 ohms while the cold and hot resistances of filament 5 were 10.3 and 153 ohms, respectively. Thus, coil 13 reduced the inrush current from over 12 amperes to about 8 amperes or less. Also, the heating rate of filament 5 was thereby substantially decreased.

As filament 5 was heating up to its normal operating temperature, the temperature of the lamp, as well as the temperature of switch 14, was gradually increasing. When the temperature of switch 14 reached about 150C, switch 14 deflected sufficiently to establish contact with rod 15 of lead-in wire 9, thereby electrically shorting out coil 13 and permitting full normal operating current to flow through filament 5. Switch 14 should be located within bulb l in a position such that it is heated to its operative temperature within a few seconds after the lamp is energized. However, switch 14 should not be so close to filament 5 that it is subjected to unnecessarily high temperatures that could render switch 14 inoperative before the lamp has reached the end of its normal life. Preferably, coil 13 is disposed proximate switch 14 so that the heat from coil 13 will activate the switch.

When the operating lamp is deenergized, switch 14 must cool to about C in order to open and thereby place resistor 13 in series with filament 5 again. Thus, if the lamp is immediately switched on again before switch 14 has cooled sufficiently, the high inrush current is not prevented. However, such immediate onswitching normally occurs only rarely; thus lamp life is generally extended by this invention even if immediate on-switching may occur several times during normal lamp life.

We claim:

1. An incandescent lamp comprising: a gas filled glass bulb sealed at its lower end to the flare of a stern press glass mount; a screw base, having a center contact, attached to the lower end of said bulb; two lead-in wires extending through the stem press of said mount, one of said lead-in wires being electrically connected to said center contact and the other being electrically connected to the rim of said screw base; a coiled tungsten wire filament disposed within said bulb and electrically connected between said two lead-in wires; an inrush current limiting refractory metal wire coil in series with said filament and a thermal switch in parallel with said wire coil, said switch operative to electrically short out said wire coil upon attainment thereof of a predetermined elevated temperature and to maintain said wire coil shorted out during lamp operation.

2. The lamp of claim 1 including means to heat said switch to said predetermined elevated temperature.

3. The lamp of claim 1 wherein said switch is normally open when the incandescent lamp is unenergized.

4. The lamp of claim 3 including means to maintain said switch closed after activation thereof.

5. The lamp of claim 1 wherein said wire coil is proximate said switch in order to heat said switch to its operative temperature within a few seconds after lamp energization.

Claims (5)

1. An incandescent lamp comprising: a gas filled glass bulb sealed at its lower end to the flare of a stem press glass mount; a screw base, having a center contact, attached to the lower end of said bulb; two lead-in wires extending through the stem press of said mount, one of said lead-in wires being electrically connected to said center contact and the other being electrically connected to the rim of said screw base; a coiled tungsten wire filament disposed within said bulb and electrically connected between said two lead-in wires; an inrush current limiting refractory metal wire coil in series with said filament and a thermal switch in parallel with said wire coil, said switch operative to electrically short out said wire coil upon attainment thereof of a predetermined elevated temperature and to maintain said wire coil shorted out during lamp operation.
2. The lamp of claim 1 including means to heat said switch to said predetermined elevated temperature.
3. The lamp of claim 1 wherein said switch is normally open when the incandescent lamp is unenergized.
4. The lamp of claim 3 including means to maintain said switch closed after activation thereof.
5. The lamp of claim 1 wherein said wire coil is proximate said switch in order to heat said switch to its operative temperature within a few seconds after lamp energization.
US3858086A 1973-10-29 1973-10-29 Extended life, double coil incandescent lamp Expired - Lifetime US3858086A (en)

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US4647893A (en) * 1983-08-05 1987-03-03 Gte Products Corporation Rapid-start fluorescent lamp having a bimetal circuit breaker with leg portions of unequal length
US4659965A (en) * 1983-11-16 1987-04-21 Gte Products Corporation High pressure discharge lamp with thermal switch
US6316878B1 (en) * 1999-05-13 2001-11-13 Nagafumi Tsukada Electric-light bulb
US20030053309A1 (en) * 2001-09-14 2003-03-20 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Incandescent lamp for motor vehicle headlamps
US6608453B2 (en) 1997-08-26 2003-08-19 Color Kinetics Incorporated Methods and apparatus for controlling devices in a networked lighting system
US6624597B2 (en) 1997-08-26 2003-09-23 Color Kinetics, Inc. Systems and methods for providing illumination in machine vision systems
US6717376B2 (en) 1997-08-26 2004-04-06 Color Kinetics, Incorporated Automotive information systems
US6774584B2 (en) 1997-08-26 2004-08-10 Color Kinetics, Incorporated Methods and apparatus for sensor responsive illumination of liquids
US6777891B2 (en) 1997-08-26 2004-08-17 Color Kinetics, Incorporated Methods and apparatus for controlling devices in a networked lighting system
US6781329B2 (en) 1997-08-26 2004-08-24 Color Kinetics Incorporated Methods and apparatus for illumination of liquids
US6801003B2 (en) 2001-03-13 2004-10-05 Color Kinetics, Incorporated Systems and methods for synchronizing lighting effects
US6869204B2 (en) 1997-08-26 2005-03-22 Color Kinetics Incorporated Light fixtures for illumination of liquids
US6888322B2 (en) 1997-08-26 2005-05-03 Color Kinetics Incorporated Systems and methods for color changing device and enclosure
US6897624B2 (en) 1997-08-26 2005-05-24 Color Kinetics, Incorporated Packaged information systems
US20050162091A1 (en) * 2004-01-22 2005-07-28 Patent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh Electric incandescent lamp
US6936978B2 (en) 1997-08-26 2005-08-30 Color Kinetics Incorporated Methods and apparatus for remotely controlled illumination of liquids
US6965205B2 (en) 1997-08-26 2005-11-15 Color Kinetics Incorporated Light emitting diode based products
US6967448B2 (en) 1997-12-17 2005-11-22 Color Kinetics, Incorporated Methods and apparatus for controlling illumination
US6975079B2 (en) 1997-08-26 2005-12-13 Color Kinetics Incorporated Systems and methods for controlling illumination sources
US7031920B2 (en) 1997-08-26 2006-04-18 Color Kinetics Incorporated Lighting control using speech recognition
US7038399B2 (en) 2001-03-13 2006-05-02 Color Kinetics Incorporated Methods and apparatus for providing power to lighting devices
US7038398B1 (en) * 1997-08-26 2006-05-02 Color Kinetics, Incorporated Kinetic illumination system and methods
US7042172B2 (en) 2000-09-01 2006-05-09 Color Kinetics Incorporated Systems and methods for providing illumination in machine vision systems
US7064498B2 (en) 1997-08-26 2006-06-20 Color Kinetics Incorporated Light-emitting diode based products
US7161311B2 (en) 1997-08-26 2007-01-09 Color Kinetics Incorporated Multicolored LED lighting method and apparatus
US7178941B2 (en) 2003-05-05 2007-02-20 Color Kinetics Incorporated Lighting methods and systems
US7187141B2 (en) 1997-08-26 2007-03-06 Color Kinetics Incorporated Methods and apparatus for illumination of liquids
US7186003B2 (en) 1997-08-26 2007-03-06 Color Kinetics Incorporated Light-emitting diode based products
US7202613B2 (en) 2001-05-30 2007-04-10 Color Kinetics Incorporated Controlled lighting methods and apparatus
US7221104B2 (en) 1997-08-26 2007-05-22 Color Kinetics Incorporated Linear lighting apparatus and methods
US7231060B2 (en) 1997-08-26 2007-06-12 Color Kinetics Incorporated Systems and methods of generating control signals
US7242152B2 (en) 1997-08-26 2007-07-10 Color Kinetics Incorporated Systems and methods of controlling light systems
US7300192B2 (en) 2002-10-03 2007-11-27 Color Kinetics Incorporated Methods and apparatus for illuminating environments
US7303300B2 (en) 2000-09-27 2007-12-04 Color Kinetics Incorporated Methods and systems for illuminating household products
US7309965B2 (en) 1997-08-26 2007-12-18 Color Kinetics Incorporated Universal lighting network methods and systems
US7358679B2 (en) 2002-05-09 2008-04-15 Philips Solid-State Lighting Solutions, Inc. Dimmable LED-based MR16 lighting apparatus and methods
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US7427840B2 (en) 1997-08-26 2008-09-23 Philips Solid-State Lighting Solutions, Inc. Methods and apparatus for controlling illumination
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US20090159919A1 (en) * 2007-12-20 2009-06-25 Altair Engineering, Inc. Led lighting apparatus with swivel connection
US7572028B2 (en) 1999-11-18 2009-08-11 Philips Solid-State Lighting Solutions, Inc. Methods and apparatus for generating and modulating white light illumination conditions
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US7659674B2 (en) 1997-08-26 2010-02-09 Philips Solid-State Lighting Solutions, Inc. Wireless lighting control methods and apparatus
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US4647893A (en) * 1983-08-05 1987-03-03 Gte Products Corporation Rapid-start fluorescent lamp having a bimetal circuit breaker with leg portions of unequal length
US4659965A (en) * 1983-11-16 1987-04-21 Gte Products Corporation High pressure discharge lamp with thermal switch
US7253566B2 (en) 1997-08-26 2007-08-07 Color Kinetics Incorporated Methods and apparatus for controlling devices in a networked lighting system
US7659674B2 (en) 1997-08-26 2010-02-09 Philips Solid-State Lighting Solutions, Inc. Wireless lighting control methods and apparatus
US6608453B2 (en) 1997-08-26 2003-08-19 Color Kinetics Incorporated Methods and apparatus for controlling devices in a networked lighting system
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US7453217B2 (en) 1997-08-26 2008-11-18 Philips Solid-State Lighting Solutions, Inc. Marketplace illumination methods and apparatus
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US7187141B2 (en) 1997-08-26 2007-03-06 Color Kinetics Incorporated Methods and apparatus for illumination of liquids
US7186003B2 (en) 1997-08-26 2007-03-06 Color Kinetics Incorporated Light-emitting diode based products
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