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WO2001084595A1 - Safety lamp - Google Patents

Safety lamp Download PDF

Info

Publication number
WO2001084595A1
WO2001084595A1 PCT/US2001/009526 US0109526W WO0184595A1 WO 2001084595 A1 WO2001084595 A1 WO 2001084595A1 US 0109526 W US0109526 W US 0109526W WO 0184595 A1 WO0184595 A1 WO 0184595A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheath
lamp
light
envelope
lamp according
Prior art date
Application number
PCT/US2001/009526
Other languages
French (fr)
Inventor
Clifford Lawrence Spiro
Jeffrey J. Davis
Laszlo Viktor Lieszkovszky
Original Assignee
General Electric Company
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Company filed Critical General Electric Company
Priority to JP2001581319A priority Critical patent/JP2003535437A/en
Publication of WO2001084595A1 publication Critical patent/WO2001084595A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/08—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using diaphragms containing one or more apertures
    • F21V11/14—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using diaphragms containing one or more apertures with many small apertures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/04—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages the fastening being onto or by the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/02—Safety devices structurally associated with lighting devices coming into action when lighting device is disturbed, dismounted, or broken
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/12—Flameproof or explosion-proof arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light

Definitions

  • the present invention relates to electric lamps and, in particular, to a lamp that minimizes dispersion of glass in the event of breakage.
  • the glass in lamps can fracture from, for example, handling or non- passive failure of a pressurized capsule such as in an arc tube or filament tube. Upon impact, explosion, implosion, or shock, the glass can be widely dispersed 0 unless retained in some manner.
  • the present invention provides a safety lamp with an easily manufactured protective layer without the substantial use of solvents and of any desired thickness.
  • the protective layer can provide other useful o characteristics and properties as set forth more fully below.
  • a safety lamp includes a glass envelope and 5 an elastomeric sheath. The sheath is stretched about the envelope.
  • FIG. 1 is a side elevation view of a safety lamp according to the invention.
  • FIG. 2 is a perspective view of a sheath according to the invention.
  • FIG. 3 is a perspective view of another sheath according to the invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • an electric lamp 10 includes a glass envelope 12 and a base 14.
  • the envelope 12 is ensheathed by an elastomeric sheath 18. While a screw-base lamp is shown, the invention is applicable to other type lamps as well, for example, discharge tube lamps such as single pin, bi-pin and recessed double-pin fluorescent lamps, quartz halogen tube lamps, bayonet base lamps, lamps with plug-in bases, lamps with pigtail leads, and so on.
  • the sheath 16 is preformed in a generally tubular shape and stretched to fit over the envelope 12.
  • sheath 16 While a generally cylindrical preformed sheath 16 is shown, it may be desirable to preform the sheath 16 in a non-cylindrical tubular form chosen to better accommodate a particular lamp envelope shape, including a closed-end tube.
  • the sheath 16 may cover, for example, the entire envelope 12 or just a substantial portion. In general, the central portion of the envelope is more likely to shatter and thus be in need of a sheath.
  • the sheath 16 has a diameter of between, for example, 70-90 percent of the diameter of the envelope 12 and preferably a diameter of about 80 percent of that of the envelope 12.
  • the thickness of the sheath 16 may be, for example, between 0.0005 inches and 0.02 inches, with a range of 0.001 inches to 0.02 inches being preferred.
  • the sheath 16 may be, for example, blow molded, injection molded or cast.
  • the sheath 16 may be formed from a suitable light-transmitting elastomeric material, for example, liquid silicone rubber such as LIM®, a two-part injection molding grade liquid silicone by GE Sllicones, or LSR may be used, heat-cured rubber including peroxide or addition-cured silicone rubber, or organic rubber such as EPDM (ethylene, propylene, monomers) rubber (e.g., ethylene, propylene, di-maleate).
  • a liquid silicone rubber is used.
  • a 100 watt halogen lamp may have, for example, a 220 degree Celsius surface temperature. In the case of lamps that do not get hot, it may be preferable to use an EPDM rubber.
  • the sheath 16 will be transparent or translucent.
  • the sheath can be colored with dyes to influence light quality.
  • Heat-age resisting or radiation stabilizing additives may be added to the sheath material.
  • the sheath 16 may be, for example, multi-colored and/or multi-layered. A multi component single layer may also be desired.
  • Ultra-violet or ozone protecting additives may be included.
  • the sheath 16 may also include optical scattering or reflecting dyes, pigments, or particulate. Flakes and/or infrared-reflecting/visible light transmitting pigment could be included in the sheath 16 to help keep the lamp 10 cooler or to improve energy efficiency. It also may be desirable to include indica 18 on the sheath 16 for advertising, nomenclature, or other uses.
  • another embodiment of the sheath 16' includes perforations 20.
  • the perforations 20 could also instead represent other types of surface textures such as dimpling, patterning and ribbing.
  • the additives and/or surface textures can be used to affect desirable optical or mechanical effects including chatoyancy, scatter, diffusion and diffraction
  • the use of the preformed sheath 16 reduces the cost of ensheathing compared to such techniques as dipping and without the use of solvents.
  • the sheath 16 effectively contains fragments of the envelope 12 in case it shatters.
  • the sheath 16 can efficiently provide color and other optical effects, as well as bearing indica.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

A safety lamp includes a preformed elastomeric sheath that is stretched about the envelope of the lamp. The sheath is transparent or translucent and may be textured, imprinted, colored, or provided with a light-scattering particulate.

Description

SAFETY LAMP
BACKGROUND OF THE INVENTION
5 The present invention relates to electric lamps and, in particular, to a lamp that minimizes dispersion of glass in the event of breakage.
The glass in lamps can fracture from, for example, handling or non- passive failure of a pressurized capsule such as in an arc tube or filament tube. Upon impact, explosion, implosion, or shock, the glass can be widely dispersed 0 unless retained in some manner.
Various coatings have been used on lamps, including silicone rubber coatings, in order to limit the dispersion of glass fragments. These coatings have been produced by dipping, spraying or painting the coating material onto the surface of the lamp or even injection molding directly upon the lamp. These 5 methods have been characterized by limited coating thickness, difficult production and/or the use of solvents.
The present invention provides a safety lamp with an easily manufactured protective layer without the substantial use of solvents and of any desired thickness. In addition, the protective layer can provide other useful o characteristics and properties as set forth more fully below.
SUMMARY OF THE INVENTION
A safety lamp includes a glass envelope and 5 an elastomeric sheath. The sheath is stretched about the envelope.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevation view of a safety lamp according to the invention. o FIG. 2 is a perspective view of a sheath according to the invention.
FIG. 3 is a perspective view of another sheath according to the invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1, an electric lamp 10 includes a glass envelope 12 and a base 14. The envelope 12 is ensheathed by an elastomeric sheath 18. While a screw-base lamp is shown, the invention is applicable to other type lamps as well, for example, discharge tube lamps such as single pin, bi-pin and recessed double-pin fluorescent lamps, quartz halogen tube lamps, bayonet base lamps, lamps with plug-in bases, lamps with pigtail leads, and so on. Referring also to FIG. 2, the sheath 16 is preformed in a generally tubular shape and stretched to fit over the envelope 12. While a generally cylindrical preformed sheath 16 is shown, it may be desirable to preform the sheath 16 in a non-cylindrical tubular form chosen to better accommodate a particular lamp envelope shape, including a closed-end tube. The sheath 16 may cover, for example, the entire envelope 12 or just a substantial portion. In general, the central portion of the envelope is more likely to shatter and thus be in need of a sheath.
In the preferred embodiment, the sheath 16 has a diameter of between, for example, 70-90 percent of the diameter of the envelope 12 and preferably a diameter of about 80 percent of that of the envelope 12. The thickness of the sheath 16 may be, for example, between 0.0005 inches and 0.02 inches, with a range of 0.001 inches to 0.02 inches being preferred.
The sheath 16 may be, for example, blow molded, injection molded or cast. The sheath 16 may be formed from a suitable light-transmitting elastomeric material, for example, liquid silicone rubber such as LIM®, a two-part injection molding grade liquid silicone by GE Sllicones, or LSR may be used, heat-cured rubber including peroxide or addition-cured silicone rubber, or organic rubber such as EPDM (ethylene, propylene, monomers) rubber (e.g., ethylene, propylene, di-maleate). In the preferred embodiment, a liquid silicone rubber is used. A 100 watt halogen lamp may have, for example, a 220 degree Celsius surface temperature. In the case of lamps that do not get hot, it may be preferable to use an EPDM rubber.
Typically, the sheath 16 will be transparent or translucent. In addition, the sheath can be colored with dyes to influence light quality. Heat-age resisting or radiation stabilizing additives may be added to the sheath material. The sheath 16 may be, for example, multi-colored and/or multi-layered. A multi component single layer may also be desired. Ultra-violet or ozone protecting additives may be included. The sheath 16 may also include optical scattering or reflecting dyes, pigments, or particulate. Flakes and/or infrared-reflecting/visible light transmitting pigment could be included in the sheath 16 to help keep the lamp 10 cooler or to improve energy efficiency. It also may be desirable to include indica 18 on the sheath 16 for advertising, nomenclature, or other uses.
Referring to FIG. 3, another embodiment of the sheath 16' includes perforations 20. The perforations 20 could also instead represent other types of surface textures such as dimpling, patterning and ribbing. The additives and/or surface textures can be used to affect desirable optical or mechanical effects including chatoyancy, scatter, diffusion and diffraction
The use of the preformed sheath 16 reduces the cost of ensheathing compared to such techniques as dipping and without the use of solvents. The sheath 16 effectively contains fragments of the envelope 12 in case it shatters. The sheath 16 can efficiently provide color and other optical effects, as well as bearing indica.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

WHAT IS CLAIMED:
1. A safety lamp comprising: a glass envelope; and an elastomeric sheath, said sheath being stretched about said envelope.
2. A lamp according to claim 1 , wherein said sheath is composed of a light-transmitting silicone rubber.
3. A lamp according to claim 1 , wherein said sheath is composed of a light-transmitting organic rubber.
4. A lamp according to claim 1 , wherein said sheath includes a light filtering material.
5. A lamp according to claim 1 , wherein said sheath includes a light scattering material.
6. A lamp according to claim 1 , wherein said sheath includes a light reflecting material.
7. A lamp according to claim 1 , wherein said sheath bears a desired indica.
8. A lamp according to claim 1 , wherein said sheath provides a desired surface texture.
9. A method for making a safety lamp, said method comprising: providing an elastomeric sheath; providing a glass envelope; and stretching said sheath about said envelope.
10. A method according to claim 9, wherein said sheath is composed of a light-transmitting silicone rubber.
11. A method according to claim 9, wherein said sheath is composed of a light-transmitting organic rubber.
12. A method according to claim 9, wherein said sheath includes a light filtering material.
13. A method according to claim 9, wherein said sheath includes a light scattering material.
14. A method according to claim 9, wherein said sheath includes a light reflecting material.
15. A method according to claim 9, wherein said sheath bears a desired indica.
16. A method according to claim 9, wherein said sheath provides a desired surface texture.
PCT/US2001/009526 2000-04-28 2001-03-26 Safety lamp WO2001084595A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001581319A JP2003535437A (en) 2000-04-28 2001-03-26 Safety lamp

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US56224300A 2000-04-28 2000-04-28
US09/562,243 2000-04-28

Publications (1)

Publication Number Publication Date
WO2001084595A1 true WO2001084595A1 (en) 2001-11-08

Family

ID=24245429

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/009526 WO2001084595A1 (en) 2000-04-28 2001-03-26 Safety lamp

Country Status (2)

Country Link
JP (1) JP2003535437A (en)
WO (1) WO2001084595A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006047049A1 (en) * 2006-10-05 2008-04-10 Rehau Ag + Co. Shatterproof fluorescent tube has transparent shatterproof protective film applied on glass tube, and made of elastomer material that can steadily withstand temperatures above 150 degrees Celsius
WO2018059973A1 (en) * 2016-09-29 2018-04-05 Lumileds Holding B.V. Lighting assembly with diffusor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003327A1 (en) * 1986-10-30 1988-05-05 Colourcover Limited Coloured electric light devices
FR2642397A1 (en) * 1989-01-27 1990-08-03 Verboom Durouchard Method for functional sheathing of lamps for sterilisation by means of ultraviolet radiation
EP0410042A1 (en) * 1989-07-26 1991-01-30 Tomoegawa Paper Co. Ltd. Lighting lamp
EP0617092A2 (en) * 1993-03-22 1994-09-28 General Electric Company Light-scattering coating, its preparation and use
JPH0794145A (en) * 1993-07-30 1995-04-07 Toshiba Lighting & Technol Corp Bulb
US5898270A (en) * 1997-04-11 1999-04-27 Ilc Technology, Inc. Monocoque structure and large electrode beaded rob re-entrant seals for flashlamp-pumped solid-state laser flashlamps

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003327A1 (en) * 1986-10-30 1988-05-05 Colourcover Limited Coloured electric light devices
FR2642397A1 (en) * 1989-01-27 1990-08-03 Verboom Durouchard Method for functional sheathing of lamps for sterilisation by means of ultraviolet radiation
EP0410042A1 (en) * 1989-07-26 1991-01-30 Tomoegawa Paper Co. Ltd. Lighting lamp
EP0617092A2 (en) * 1993-03-22 1994-09-28 General Electric Company Light-scattering coating, its preparation and use
JPH0794145A (en) * 1993-07-30 1995-04-07 Toshiba Lighting & Technol Corp Bulb
US5898270A (en) * 1997-04-11 1999-04-27 Ilc Technology, Inc. Monocoque structure and large electrode beaded rob re-entrant seals for flashlamp-pumped solid-state laser flashlamps

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 07 31 August 1995 (1995-08-31) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006047049A1 (en) * 2006-10-05 2008-04-10 Rehau Ag + Co. Shatterproof fluorescent tube has transparent shatterproof protective film applied on glass tube, and made of elastomer material that can steadily withstand temperatures above 150 degrees Celsius
DE102006047049B4 (en) * 2006-10-05 2019-06-27 Ledvance Gmbh A method for producing a splinter-protected fluorescent tube, fluorescent tube produced by such a method and anti-splintering coating therefor
WO2018059973A1 (en) * 2016-09-29 2018-04-05 Lumileds Holding B.V. Lighting assembly with diffusor
CN109790963A (en) * 2016-09-29 2019-05-21 亮锐控股有限公司 Light fixture with diffuser
US10845025B2 (en) 2016-09-29 2020-11-24 Lumileds Llc Lighting assembly with diffusor
CN109790963B (en) * 2016-09-29 2022-08-26 亮锐控股有限公司 Lighting assembly with diffuser

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Publication number Publication date
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