GB2499998A - A method of coating an end cap of a lamp in order to retain fragments of glass if broken - Google Patents

A method of coating an end cap of a lamp in order to retain fragments of glass if broken Download PDF

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Publication number
GB2499998A
GB2499998A GB201203840A GB201203840A GB2499998A GB 2499998 A GB2499998 A GB 2499998A GB 201203840 A GB201203840 A GB 201203840A GB 201203840 A GB201203840 A GB 201203840A GB 2499998 A GB2499998 A GB 2499998A
Authority
GB
United Kingdom
Prior art keywords
lamp
coating
end cap
flap portion
face
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.)
Withdrawn
Application number
GB201203840A
Other versions
GB201203840D0 (en
Inventor
David Charles Payne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FOTOLEC TECHNOLOGIES Ltd
Original Assignee
FOTOLEC TECHNOLOGIES Ltd
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 FOTOLEC TECHNOLOGIES Ltd filed Critical FOTOLEC TECHNOLOGIES Ltd
Priority to GB201203840A priority Critical patent/GB2499998A/en
Publication of GB201203840D0 publication Critical patent/GB201203840D0/en
Priority to EP13157893.2A priority patent/EP2637196A3/en
Publication of GB2499998A publication Critical patent/GB2499998A/en
Withdrawn legal-status Critical Current

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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/03—Arrangements for preventing or mitigating effects of implosion of vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/08—Vessels; Containers; Shields associated therewith; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/205—Applying optical coatings or shielding coatings to the vessel of flat panel displays, e.g. applying filter layers, electromagnetic interference shielding layers, anti-reflection coatings or anti-glare coatings

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)

Abstract

A method of coating an end cap of a lamp wherein a continuous coating 9 is provided to spaced apart first 1 and second lamps 12. The coating is divided between a first end of the first lamp and a second end of a second lamp to provide a flap portion 11. The flap portion extends beyond an end cap located at the first end of the first lamp. The flap portion is folded over the first end of the first lamp and covers a centre portion of the end face. This prevents shards of glass escaping between a damaged end cap and a protective coating which stops short of the end cap.

Description

5
10 - 1 -
A Method of Coating an End Cap of a Fragment Retention Lamp Field of the Invention
15 The invention relates to methods for coating electrical lamps, and in particular to fragment retention lamps.
Background of the Invention
20 The closest prior art is the Applicant's own process of coating fluorescent tubes with a plastics film, so that if the tube shatters in use, the plastics film retains all of the glass fragments.
There are a number of methods which utilise a shroud which covers the metallic end cap of 25 a fragment retention lamp. The protective shroud is typically placed over contact pins of the lamp, whereby the pins protrude through the body of the shroud. A continuous film coating is then applied to both the light emitting outer surface of the lamp and the shroud. Or, alternatively the continuous film coating is applied to the light emitting outer surface of the lamp and its associated end caps. The protective shrouds are then located over the 30 end caps of the lamp and directly attached to the coating of the lamp.
Problem to be Solved
The problem of the fragment retention lamp is that if the lamp hits the ground and shatters, glass fragments or debris may become separated from the fragment retention lamp. This may result in the glass fragments or debris protruding through the centre of one of the lamp's end caps.
The invention, by coating the lamp with a suitable plastics material, which has extending flat portions that are arranged over the centre portions of the end caps, seeks to solve this problem.
Summary of the Invention
In a first broad independent aspect, the invention provides a method of coating an end cap of a fragment retention lamp, comprising the steps of:
• Dividing a continuous coating arranged about a first lamp and a second lamp, whereby said division is located between one end of said first lamp and a neighbouring end of said second lamp; wherein a flap portion of said coating extends beyond an end cap located at said first end of said first lamp; and
• Arranging said flap portion over a centre portion of an end face of said end cap.
This configuration provides the advantages of:
• Providing a simple and cost effective means of enclosing the end cap portions of the lamp with portions of the continuous coating applied to the lamp.
• The use of the coating portions to enclose the end caps of the lamp, eliminates the requirement of any additional components to enclose the ends of the lamp, such a protective shrouds.
• The use of the continuous coating to enclose the ends of the lamp, enables high speed, high volume production of the lamps with any intermediary assembly operations.
• Provides a means of reducing the size and mass of each end of the lamp, because no other components are required to enclose the end face of each end cap.
3
Preferably, a method of coating an end cap of a fragment retention lamp further comprising the additional step of forming a second flap portion of coating which extends beyond said end cap located at said first end of said first lamp. This provides a means of covering an increased surface of the end face surface of the end cap, which 5 prevents glass fragments or debris from escaping the covered end face of the cap.
Preferably, a method of coating an end cap of a fragment retention lamp further comprising the additional step of arranging said second flap portion over said centre portion of said end face and said flap portion. It provides a means for a more effective
10 closure of the coating about an end cap, whereby the second flap portion cooperates with the first flap portion to provide a means of augmenting the central covering, which prevents sharp glass fragments from cutting through the two enclosing flap portions.
15 Preferably, a method of coating an end cap of a fragment retention lamp further comprising the additional step of applying an adhesive material to the inner surface said second flap portion and / or said flap portion. This provides a means of fixing the portions of coating in the desired position, whilst cooperating with each other and against the end face of an end cap.
20
Preferably, a method of coating an end cap of a fragment retention lamp further comprises the additional step of forming a portion of coating which extends about and beyond an outer edge of said end face of said end cap, wherein said portion is arranged against said end face. This configuration prevents the movement of glass fragments or
25 debris between the layer of coating and the outer surface of the lamp and/or end cap so that they cannot protrude from or exit the lamp.
In a second broad independent aspect, the invention provides an apparatus for coating an end of a fragment retention lamp, comprising:
30
• a means for dividing a continuous coating arranged about a first lamp and a second lamp, whereby said division is located between one end of said first lamp and a neighbouring end of said second lamp; wherein a flap portion of
4
said coating extends beyond an end cap located at said first end of said first lamp; and
• a means for arranging said flap portion over a centre portion of an end face of said end cap.
5
Preferably, said means for dividing said coating is a laser cutting means. This provides a means for accurately dividing the continuous coating, which enables the separation of the two lamps.
10 Preferably, said laser cutting means forms said flap in accordance to predetermined profile. This enables the laser cutter to accurately cut the coating in accordance with accurately stored or loaded profiles which can be either automatically or manually selected.
15 Preferably, said predetermined profile parabola shaped. This configuration provides the coating portion with the maximum surface area coverage at its base and providing coverage by its elongated end portion, which is located over the central portion of the end face of the cap, in between the two electrical contact pins of the lamp.
20 Preferably, a fragment retention lamp obtained from said method stated above.
Preferably, a fragment retention lamp manufactured by said apparatus stated above.
In a third broad independent aspect, the invention provides a fragment retention lamp, 25 comprising a continuous coating which has been divided at one end; said coating incorporates a flap portion that extends beyond an end cap located at said end of said lamp, which in use, is arranged over a centre portion of an end face of said end cap.
5
Brief Description of the Drawings
Figure 1 shows a side view of two continuously coated lamps being divided by a laser.
5 Figure 2 shows a side view of the separation of two coated lamps.
Figure 3 shows an end portion of a coated lamp with an extended flap portion.
Figure 4 shows an end portion of a coated lamp with two flap portions arranged about the 10 end cap of a coated lamp.
Figure 5 shows an end view of the lamp with two flap portions arranged over the end face of the end cap.
15 Detailed Description of the Figures
Figure 1 shows two fluorescent tube lamps 1 and 2 axially arranged end to end, whereby an end cap 3 of the first lamp 1 is arranged in close proximity to an end cap 4 of the second lamp 2. A linking member 5 is arranged between the two lamps 1 and 2, which 20 links the two lamps 1 and 2 together in a continuous cylinder configuration. A continuous coating 6 is applied to the outer surface of the two lamps 1 and 2, and the linking member 5. The coating is a continuous plastics film coating applied to the lamps 1 and 2 by a cross head application process.
25 Once the coating of tubes 1 and 2 has been completed a laser cutting means 7 emits a cutting laser beam 8 onto the coating 6 that extends across the link member 5, located between the two lamps 1 and 2. The laser cutting means 7 incorporates information/program that is indicative of a predetermined profile which is used to cut the coating 6. The profile of the laser cut provides two engaged parabola-shaped end portions 30 9 and 10. Both of the parabola shaped end portions 9 and 10 are rotated 180 degrees in relation to other.
Figure 2 shows the separation of the two lamps 1 and 2 whereby the link device 5 has been removed and the profiles of the two end portions 9 and 10 of the coating are rotated
6
by 180 degrees in relation to each other. Lamp 1 shows two flap portions 11 and 12 arranged within the coating 6, and lamp 2 shows a flap portion 13 arranged within coating 6. The flap portion 13 is the inverse of flap portions 11 and 12.
5 Figure 3 shows an end portion 9 of the lamp 1 whereby the coating portion 12 has been folded over, against the end face surface 15 of the end cap 3. The electrical connect pins 16 of the lamp 1 are shown to be extending from the folded portion 12. The second portion 11 is shown to be extending from the end face surface 15 of the end cap 3.
10 Figure 4 shows the lamp 1 whereby the second portion of coating 11 is folded over the folded first portion of coating 12. The second portion of coating 11 overlays the first portion 12 and allows the electrical contact pins 16 to protrude from the end cap 3 and from the folded portions of coating 11 and 12 folded over / arranged about the end face 14 of the end cap 3.
15
Figure 5 shows an end view of the enclosed end cap 3 of the fragment lamp 1 whereby the first portion 12 of coating 6 has been folded over the centre portion of the end face 15 of the end cap 3 and a second portion of coating 11 has been folded over the top of the first portion of coating 12 and is laying directly across the centre portion of the end cap 3, 20 between the two electrical contact pins 16.
In use, the arranged flat portions of the coating prevent any chards from escaping the fragment retention lamp through the centre portion of the end cap. This is of great of great concern as slithers of glass or debris may protrude through the end portion if the 25 lamp is dropped and or shatters; this in particularly relevant in a clean room environment such as food or drug processing facilities.
In an alternative embodiment of the invention a protrusion of coating may extend about the outer edge of the end face, which is the subsequently be folded over the outer edge of 30 the end cap and against the end face of the end cap to form a bevelled edge; therefore preventing any glass fragments or debris from escaping the lamp, by limiting their movement between the coating and the end cap.
7
In an alternative embodiment of the invention the flap portions of coating that have been folded over and re-arranged against the end face of the end cap may incorporate an adhesive substance on each of the inner surfaces of the flaps that allows the flats to be formed and held flat against the end cap's end face therefore preventing the coating 5 portion from springing back into the original positions.
In an alternative embodiment of the invention a hot air device may be used to soften the continuous plastics coating which surrounds the lamp so that when the flaps and/or bevelled edge are formed and pushed into the position the substances will co-operate with 10 the hot air gun and will set in position once the plastics material has cooled.
In an alternative embodiment of the invention various cutting profiles may be loaded and maintained in the memory of the cutting device which can be called upon when needed,
i.e. different cutting profiles may be required for different tube diameters and
15 configurations.
An embodiment of the protection of the end cap may be used which incorporates only a single flap which is folded across the centre of the end face of the end cap to prevent any chards from escaping through the centre portion of the end cap, without the use of a 20 second flap.
8

Claims (1)

  1. Claims
    1. A method of coating an end cap of a fragment retention lamp, comprising the steps of:
    • Dividing a continuous coating arranged about a first lamp and a second lamp, whereby said division is located between one end of said first lamp and a neighbouring end of said second lamp; wherein a flap portion of said coating extends beyond an end cap located at said first end of said first lamp; and
    • Arranging said flap portion over a centre portion of an end face of said end cap.
    2. A method according to claim 1, further comprising the additional step of forming a second flap portion of coating which extends beyond said end cap located at said 15 first end of said first lamp.
    3. A method according to claim 2, further comprising the additional step of arranging said second flap portion over said centre portion of said end face and said flap portion .
    20
    4. A method according any of the preceding claims, further comprising the additional step of applying an adhesive material to the inner surface said second flap portion and / or said flap portion.
    25 5. A method according to any of the preceding claims, further comprising the additional step of forming a portion of coating which extends about and beyond an outer edge of said end face of said end cap, wherein said portion is arranged against said end face.
    30 6. An apparatus for coating an end of a fragment retention lamp, comprising:
    • A means for dividing a continuous coating arranged about a first lamp and a second lamp, whereby said division is located between one end of said first lamp and a neighbouring end of said second lamp; wherein a flap portion of
    9
    said coating extends beyond an end cap located at said first end of said first lamp; and
    • A means for arranging said flap portion over a centre portion of an end face of 5 said end cap.
    7. An apparatus according to claim 6, wherein said means for dividing said coating is a laser cutting means.
    10 8. An apparatus according to claim 7, wherein said laser cutting means forms said flap in accordance to predetermined profile.
    9. An apparatus according to claim 8, wherein said predetermined profile is parabola shaped.
    15
    10. A fragment retention lamp obtained from said method according to claims 1 to 5.
    11. A fragment retention lamp manufactured by said apparatus according to claims 6 to 9.
    20
    12. A fragment retention lamp, comprising a continuous coating which has been divided at one end; said coating incorporates a flap portion that extends beyond an end cap located at said end of said lamp, which in use, is arranged over a centre portion of an end face of said end cap.
    25
    13. A method of coating an end cap of a fragment retention lamp substantially as hereinbefore described and/or illustrated in any appropriate combination of the accompanying text and/or figures.
    30
    14.
    An apparatus for coating an end of a fragment retention lamp substantially as hereinbefore described and/or illustrated in any appropriate combination of the accompanying text and/or figures.
    10
    15. A fragment retention lamp substantially as hereinbefore described and/or illustrated in any appropriate combination of the accompanying text and/or figures.
GB201203840A 2012-03-05 2012-03-05 A method of coating an end cap of a lamp in order to retain fragments of glass if broken Withdrawn GB2499998A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB201203840A GB2499998A (en) 2012-03-05 2012-03-05 A method of coating an end cap of a lamp in order to retain fragments of glass if broken
EP13157893.2A EP2637196A3 (en) 2012-03-05 2013-03-05 A method of coating an end cap of a fragment retention lamp, apparatus therefor, and lamp manufactured thereby

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201203840A GB2499998A (en) 2012-03-05 2012-03-05 A method of coating an end cap of a lamp in order to retain fragments of glass if broken

Publications (2)

Publication Number Publication Date
GB201203840D0 GB201203840D0 (en) 2012-04-18
GB2499998A true GB2499998A (en) 2013-09-11

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ID=46003136

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201203840A Withdrawn GB2499998A (en) 2012-03-05 2012-03-05 A method of coating an end cap of a lamp in order to retain fragments of glass if broken

Country Status (2)

Country Link
EP (1) EP2637196A3 (en)
GB (1) GB2499998A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT15737U1 (en) * 2016-11-28 2018-05-15 Zumtobel Lighting Gmbh Elongated light

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673401A (en) * 1969-10-29 1972-06-27 Thermoplastic Processes Inc Fluorescent lamp protection apparatus
GB2480243A (en) * 2010-05-10 2011-11-16 Fotolec Technologies Ltd A shroud

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5729085A (en) * 1996-03-22 1998-03-17 Royal Lite Manufacturing And Supply Corp. Fluorescent lamp with a protective assembly
US6452325B1 (en) * 2000-07-24 2002-09-17 Thermoplastic Processes, Inc. Shatterproofing of fluorescent lamps

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673401A (en) * 1969-10-29 1972-06-27 Thermoplastic Processes Inc Fluorescent lamp protection apparatus
GB2480243A (en) * 2010-05-10 2011-11-16 Fotolec Technologies Ltd A shroud

Also Published As

Publication number Publication date
GB201203840D0 (en) 2012-04-18
EP2637196A2 (en) 2013-09-11
EP2637196A3 (en) 2014-08-27

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