CA2411560A1 - A fluorescent lamp and method for attaching a base member to an end of same - Google Patents
A fluorescent lamp and method for attaching a base member to an end of same Download PDFInfo
- Publication number
- CA2411560A1 CA2411560A1 CA002411560A CA2411560A CA2411560A1 CA 2411560 A1 CA2411560 A1 CA 2411560A1 CA 002411560 A CA002411560 A CA 002411560A CA 2411560 A CA2411560 A CA 2411560A CA 2411560 A1 CA2411560 A1 CA 2411560A1
- Authority
- CA
- Canada
- Prior art keywords
- end portion
- shell member
- base shell
- envelope
- collar
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims description 30
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000011521 glass Substances 0.000 claims abstract description 24
- 239000000853 adhesive Substances 0.000 claims description 27
- 230000001070 adhesive effect Effects 0.000 claims description 27
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000001723 curing Methods 0.000 claims 3
- 238000013007 heat curing Methods 0.000 claims 1
- 239000004568 cement Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- 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
- H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
- H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
-
- 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
- H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
- H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
- H01J5/58—Means for fastening the separate part to the vessel, e.g. by cement
Abstract
A fluorescent lamp includes a glass envelope having a sealed end portion, a base shell member of a cup-shape configuration adapted to engage the envelope end portion, and a collar of shrink wrap material disposed around the envelope end portion and sides of the base shell member, the shrink wrap material being shrunken and compressing against the envelope end portion and the base shell member, to fix the base shell member on the envelope end portion.
Description
1 Attorney Docket No. 00-1-220 7 1. Field of the Invention 8 The invention relates to fluorescent lamps, and is directed 9 more particularly to a base for such lamps.
2. Description of the Prior Art:
11 In the manufacture of lamps, a lamp envelope is usually 12 provided with at least one base. Generally, a lamp base 13 comprises a rigid shell secured to an end portion of the lamp 14 envelope. At least one insulating disk is fixed in the shell for carrying one or more hollow base pins, or contacts, into which 16 the lamp lead wires are electrically secured. The lamp is 17 supported by one or more holders, or sockets, into which the lamp 18 bases extend for communication with a source of electrical 19 energy.
Typically, such lamp bases axe secured to the end portions 21 of the lamp envelope by means of a cement which is applied to the 22 inside surface of a base shell annular wall. A sufficient 23 quantity of cement is used to fill a gap between a lamp seal and 24 the annular wall of the base. During manufacturing, each base is first fitted loosely onto a respective end portion of the lamp 26 envelope. Thereafter, the cement is cured, as by heating, which 27 allows the base to adhere to the lamp bulb and withstand industry 28 torque requirements.
1 While the above technique of securing the lamp base by means 2 of a suitable cement has been employed successfully in many lamp 3 families, including fluorescent, it has been found that certain 4 disadvantages exist. For example, the cement not only adds cost to the lamp but also requires the need for a separate process of 6 applying the raw cement to the base shell. Moreover, while 7 present manufacturing facilities using such a technique are 8 equipped with machines which dispense cement, the machines 9 require constant monitoring and periodic mechanical and electrical maintenance. Another- disadvantage is the curing 11 process of the cement, wherein indirect natural gas flame heat is 12 used to cure the basing cement after the base is fitted to the 13 end of the lamp. The temperatures required to cure the cement 14 sometimes cause damage in the seal area of the lamp envelope. In addition, the machinery needed to provide the heat for curing not 16 only requires periodic maintenance but also takes up valuable 17 floor space in the production line.
18 Various alternatives for securing the base to the lamp end 19 with little or r~o cement, or other type of adhesive, have been proposed in the past. For example, U.S. Patent No. 2,993,191, 21 which issued on July 18, 1961 to Pietzsch et al, discloses a base 22 for an electric discharge lamp wherein the base is constructed 23 from resin having a modulus of elasticity which is greater than 24 5,000 kg./cm.2 and as high as about 19,000 kg./cm.2. The resin has a breaking dilation of more than 50% and as high as about 230%
26 and has an initial softening temperature of as low as about 150°
27 Celsius and as high as about 210° Celsius. In one embodiment, 28 the base of Pietzsch et al is positioned with the annular wall 1 adjacent to the trough of a bulb end which has been heated to 2 about 330° to 350° Celsius. As a result, the base material melts 3 and occupies the trough or channel and, by reason of the 4 character of the material of which the base is composed, adheres to the surface of the glass bulb. Alternatively, the base may be 6 pressed against the bulb end to cause an annular rib or 7 reinforcement to snap over the bead or rim and into a trough or 8 channel of the bulb without heating the bulb neck.
9 U.S. Patent No. 4,221,453, which issued to Wagener on September 9, 1980, discloses a base for a fluorescent lamp. The 11 base comprises a frontal portion, contact pins electrically 12 connected to the connecting wires, at least one drop of glue 13 which dries at room temperature, and an annular wall extending 14 circumferentially from and perpendicular to the frontal portion.
The annular wall has at least two equally circumferentially 16 spaced knobs protruding inwardly. The base is formed from an 17 elastic, bendable thermoplastic material so that when the base is 18 fitted to the tube over the end portion, the annular wall 19 elastically deforms and the knobs slide over the collar and snap into the groove of the lamp end portion. To safeguard against 21 rotary movement of the base relative to the bulb, the base is 22 formed with radial ribs to be disposed in notches provided in the 23 bulb neck.
24 U.S. Patent No. 5,432,400, which issued July 11, 1995 to Spaulding et al, discloses a lamp including a glass envelope 26 having a base fitted at each end portion thereof. Each lamp base 27 includes a metallic base shell having an annular flange. The 28 annular flange is heated prior to fitting over the end portion of 1 the envelope so as to increase the inner flange diameter.
2 Cooling of the annular flange after fitting reduces the flange 3 diameter, thereby providing an interference fit with the end 4 portion. The lamp base is retained on the end portion without the need for basing cement. In order to accommodate variations 6 in the diameter of the lamp seals, an annular rib is formed on 7 the inner surface of the flange. After cooling, the annular rib a forms an interference fit with the lamp end portion.
9 While the bases described in the above patents appear to be satisfactory from a functional standpoint, it is believed that Z1 unanticipated production and/or other related problems, as well 12 as material cost, may explain why such bases have not been 13 commercially successful. Accordingly, it is deemed advantageous 14 to provide another viable alternative.
2 An object of the invention is, therefore, to provide a 3 fluorescent lamp in which each base is fixed to a lamp envelope 4 end in a manner requiring little machinery, reduced time, and greatly reduced costs.
6 A further object of the invention is to provide a method for 7 attaching a base member to an end of a lamp envelope, which 8 method is relatively simple and easily accomplished with little 9 machinery, and reduced time and costs.
With the above and other objects in view, as will 11 hereinafter appear, a feature of the present invention is the 12 provision of a fluorescent lamp comprising a glass envelope 13 having an end portion, and a base shell member of a cup-shape 14 configuration adapted to engage the envelope end portion. A
collar of shrink wrap material is disposed around the envelope 16 end portion and sides of the base shell member, the shrink wrap 17 material being shrunken and compressing against the envelope end 18 portion and the base shell member, to fix the base shell member 19 on the envelope end portion.
In accordance with a further feature of the invention, there 21 is provided a method for attaching a base member to an end of a 22 fluorescent lamp glass envelope. The method comprises the steps 23 of providing an annular end portion on a wall portion of the 24 glass envelope, and pressing a base shell member of a cup-shape configuration onto the end portion of the envelope. Further 26 steps include applying a collar of shrink wrap material to the 27 envelope end portion and the base shell member, and shrinking the 28 collar to compress against the envelope end portion and the base 1 shell member, to fix the base srell member on the envelope end 2 portion.
3 In accordance with a still further feature of the invention, 4 there is provided a fluorescent lamp comprising a glass envelope having an end portion and a base shell member of a cup-shape 6 configuration adapted to engage the envelope end portion. A
2. Description of the Prior Art:
11 In the manufacture of lamps, a lamp envelope is usually 12 provided with at least one base. Generally, a lamp base 13 comprises a rigid shell secured to an end portion of the lamp 14 envelope. At least one insulating disk is fixed in the shell for carrying one or more hollow base pins, or contacts, into which 16 the lamp lead wires are electrically secured. The lamp is 17 supported by one or more holders, or sockets, into which the lamp 18 bases extend for communication with a source of electrical 19 energy.
Typically, such lamp bases axe secured to the end portions 21 of the lamp envelope by means of a cement which is applied to the 22 inside surface of a base shell annular wall. A sufficient 23 quantity of cement is used to fill a gap between a lamp seal and 24 the annular wall of the base. During manufacturing, each base is first fitted loosely onto a respective end portion of the lamp 26 envelope. Thereafter, the cement is cured, as by heating, which 27 allows the base to adhere to the lamp bulb and withstand industry 28 torque requirements.
1 While the above technique of securing the lamp base by means 2 of a suitable cement has been employed successfully in many lamp 3 families, including fluorescent, it has been found that certain 4 disadvantages exist. For example, the cement not only adds cost to the lamp but also requires the need for a separate process of 6 applying the raw cement to the base shell. Moreover, while 7 present manufacturing facilities using such a technique are 8 equipped with machines which dispense cement, the machines 9 require constant monitoring and periodic mechanical and electrical maintenance. Another- disadvantage is the curing 11 process of the cement, wherein indirect natural gas flame heat is 12 used to cure the basing cement after the base is fitted to the 13 end of the lamp. The temperatures required to cure the cement 14 sometimes cause damage in the seal area of the lamp envelope. In addition, the machinery needed to provide the heat for curing not 16 only requires periodic maintenance but also takes up valuable 17 floor space in the production line.
18 Various alternatives for securing the base to the lamp end 19 with little or r~o cement, or other type of adhesive, have been proposed in the past. For example, U.S. Patent No. 2,993,191, 21 which issued on July 18, 1961 to Pietzsch et al, discloses a base 22 for an electric discharge lamp wherein the base is constructed 23 from resin having a modulus of elasticity which is greater than 24 5,000 kg./cm.2 and as high as about 19,000 kg./cm.2. The resin has a breaking dilation of more than 50% and as high as about 230%
26 and has an initial softening temperature of as low as about 150°
27 Celsius and as high as about 210° Celsius. In one embodiment, 28 the base of Pietzsch et al is positioned with the annular wall 1 adjacent to the trough of a bulb end which has been heated to 2 about 330° to 350° Celsius. As a result, the base material melts 3 and occupies the trough or channel and, by reason of the 4 character of the material of which the base is composed, adheres to the surface of the glass bulb. Alternatively, the base may be 6 pressed against the bulb end to cause an annular rib or 7 reinforcement to snap over the bead or rim and into a trough or 8 channel of the bulb without heating the bulb neck.
9 U.S. Patent No. 4,221,453, which issued to Wagener on September 9, 1980, discloses a base for a fluorescent lamp. The 11 base comprises a frontal portion, contact pins electrically 12 connected to the connecting wires, at least one drop of glue 13 which dries at room temperature, and an annular wall extending 14 circumferentially from and perpendicular to the frontal portion.
The annular wall has at least two equally circumferentially 16 spaced knobs protruding inwardly. The base is formed from an 17 elastic, bendable thermoplastic material so that when the base is 18 fitted to the tube over the end portion, the annular wall 19 elastically deforms and the knobs slide over the collar and snap into the groove of the lamp end portion. To safeguard against 21 rotary movement of the base relative to the bulb, the base is 22 formed with radial ribs to be disposed in notches provided in the 23 bulb neck.
24 U.S. Patent No. 5,432,400, which issued July 11, 1995 to Spaulding et al, discloses a lamp including a glass envelope 26 having a base fitted at each end portion thereof. Each lamp base 27 includes a metallic base shell having an annular flange. The 28 annular flange is heated prior to fitting over the end portion of 1 the envelope so as to increase the inner flange diameter.
2 Cooling of the annular flange after fitting reduces the flange 3 diameter, thereby providing an interference fit with the end 4 portion. The lamp base is retained on the end portion without the need for basing cement. In order to accommodate variations 6 in the diameter of the lamp seals, an annular rib is formed on 7 the inner surface of the flange. After cooling, the annular rib a forms an interference fit with the lamp end portion.
9 While the bases described in the above patents appear to be satisfactory from a functional standpoint, it is believed that Z1 unanticipated production and/or other related problems, as well 12 as material cost, may explain why such bases have not been 13 commercially successful. Accordingly, it is deemed advantageous 14 to provide another viable alternative.
2 An object of the invention is, therefore, to provide a 3 fluorescent lamp in which each base is fixed to a lamp envelope 4 end in a manner requiring little machinery, reduced time, and greatly reduced costs.
6 A further object of the invention is to provide a method for 7 attaching a base member to an end of a lamp envelope, which 8 method is relatively simple and easily accomplished with little 9 machinery, and reduced time and costs.
With the above and other objects in view, as will 11 hereinafter appear, a feature of the present invention is the 12 provision of a fluorescent lamp comprising a glass envelope 13 having an end portion, and a base shell member of a cup-shape 14 configuration adapted to engage the envelope end portion. A
collar of shrink wrap material is disposed around the envelope 16 end portion and sides of the base shell member, the shrink wrap 17 material being shrunken and compressing against the envelope end 18 portion and the base shell member, to fix the base shell member 19 on the envelope end portion.
In accordance with a further feature of the invention, there 21 is provided a method for attaching a base member to an end of a 22 fluorescent lamp glass envelope. The method comprises the steps 23 of providing an annular end portion on a wall portion of the 24 glass envelope, and pressing a base shell member of a cup-shape configuration onto the end portion of the envelope. Further 26 steps include applying a collar of shrink wrap material to the 27 envelope end portion and the base shell member, and shrinking the 28 collar to compress against the envelope end portion and the base 1 shell member, to fix the base srell member on the envelope end 2 portion.
3 In accordance with a still further feature of the invention, 4 there is provided a fluorescent lamp comprising a glass envelope having an end portion and a base shell member of a cup-shape 6 configuration adapted to engage the envelope end portion. A
7 collar of wrap material is disposed around the envelope end 8 portion and sides of the base shell member, an adhesive is 9 disposed on an interior surface of the collar, the adhesive being contiguous with the glass envelope end portion and the base shell 11 member, to fix the base shell member on the envelope end portion.
12 In accordance with a still further feature of the invention, 13 there is provided a method for attaching a base member to an end 14 of a fluorescent lamp glass envelope, the method comprising the steps of providing an annular end portion on a wall portion of 16 the glass envelope, pressing a base shell member of a cup-shape 17 configuration onto the end portion of the envelope, and applying 18 a collar of wrap material to the envelope end portion and the 19 base shell member, the wrap material having an adhesive on an interior surface of the collar,. to fix the base shell member on 21 the envelope end portion.
22 The above and other features of the invention, including 23 various novel details of construction and combinations of parts 24 and method steps will now be more particularly described with reference to the accompanying drawings and pointed out in the 26 claims. It will be understood that the particular devices and 27 method steps embodying the invention are shown by way of 28 illustration only and not as limitations of the invention. The 1 principles and features of this invention may be employed in 2 various and numerous embodiments without departing from the scope 3 of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
6 Reference is made to the accompanying drawings in which is 7 shown an illustrative embodiment. of the invention, from its which 8 novel features and advantages will be apparent.
9 In the drawings:
FIG. 1 is a side elevational, partly sectional, view of an 11 end portion of a fluorescent lamp, showing one form of base 12 member attachment to the lamp envelope, illustrative of an 13 embodiment of the invention;
14 FIG. 2 is similar to FIG. 1, but illustrative of an alternative embodiment;
16 FIGS. 3 and 4 are exploded perspective views of the 17 components of the base member attachment means of FIGS. 2;
1 and 18 and 19 FIG. 5 is a perspective view of the assembled components of the base members attachment means of FIGS. 1 - 4.
2 Referring to FIG. 1, it will be seen that a fluorescent lamp 3 10 comprising a tubular vitreous or glass envelope 12 is provided 4 with an inner coating of phosphor 14 and is hermetically sealed S at each end by a glass mount 16. Each mount 16 includes a stem 6 press 18 within which a pair of lead wires 20 are sealed. A
7 thermionic electrode 22 is mounted on the inner ends of lead 8 wires 20 within the tubular glass envelope 12. Each thermionic 9 electrode 22 comprises a tungsten coil coated with an emissive material of alkaline earth oxides.
11 In accordance with standard lamp-making practices, the 12 envelope 12 is filled with a su=table starting gas and doped with 13 mercury to provide an ionizable medium within the sealed 14 envelope, which permits an electric discharge to pass between the thermionic electrodes.
16 Each end portion 24 of the lamp envelope 12 may include an 17 annular groove 34 which terminates at an annular rim or seal 38.
18 Each of the sealed end portions 24 of envelope 12 is fitted with 19 a base 30 that includes a pair of axially-extending metal base pins 32, or other form of contacts, which serve as terminals for 21 the lamp 10 and are adapted, by virtue of their spacing and 22 dimensions, to permit the lamp to be inserted into the socket 23 components of a lighting fixture and be operated from a suitable 24 electrical power supply. Each lead wire 20 extends through the stem press 18 in mount 16 to a respective metal base pin 32.
26 Base 30 includes a metallic base shell 42 having an annular 27 flange 44. When the base 30 is secured to the lamp end portion in 28 a manner to be described below, an inner surface 40 of the 1 annular flange 44 contacts the lamp end portion 24 and when the 2 end portion includes the seal 38, contacts the annular seal 38.
3 Base shell 42 is formed of a suitable metal, such as aluminum.
4 The base shell 42 may be provided with an inwardly-directed annular ridge (not shown) for engaging the groove 34.
6 A disk 46 of insulating material is secured to base shell 7 42. The base pins 32 are received in registering apertures 8 formed in the insulating disk 46. Each of the base pins 32 is 9 provided with a flange portion 48 engaging the lower surface of disk 46, the base pin inner ends being swaged or riveted into 11 contact with the upper surface of disk 46, thus rigidly securing 12 the pins in position.
13 While the base 30 is shown including two base pins, any 14 number of pins may be used depending upon the type of lamp.
While only one insulator disk is used in the base illustrated, 16 each base pin may be mounted on separate insulating disks.
17 To secure the base shell 42 to the envelope 12, the base 18 shell member 42 is pressed onto the end portion 24 of the 19 envelope 12. A collar 60 of shrink wrap material is fitted around the annular end portion 24 of the envelope 12, and around 21 the flange 44 of the base shell member 42. The collar 60 is 22 shrunken, as by the application of heat, to compress against the 23 envelope end portion 24, and the base shell member flange 44, to 24 urge the shell member flange 44 against envelope end portion 24, including the seal 38, if present, to fix the base shell member 26 42 on the envelope end portion 24.
27 Alternatively, or in combination with the above, the collar 28 60 may be provided with a layer of adhesive 62 (FIG. 2) on an 1 interior surface 64 thereof. In this embodiment, the collar 60 2 is adhered to the glass envelope end portion 24 and the base 3 member flange portion 44, with which the adhesive 62 is 4 contiguous, to fix the base shell member 42 on the envelope end portion 24. The adhesive 62 may be heat curable, in which case 6 the adhesive is cured by the application of hot air, or the like, 7 to bond with the envelope end portion 24 and the base shell 8 flange 44 to fix the shell member 42 on the glass envelope end 9 portion 24.
There is thus provided a fluorescent lamp in which a base 11 member is fixed to a lamp envelope end portion in a manner and by 12 way of a method requiring little machinery, and reduced time and 13 costs relative to prior methods.
14 It will be understood that many additional changes in the details, materials, steps and arrangement of parts, which have 16 been herein described and illustrated in order to explain the 17 nature of the invention, may be made by those skilled in the art 18 within the principles and scope of the invention as expressed in 19 the appended claims.
to
12 In accordance with a still further feature of the invention, 13 there is provided a method for attaching a base member to an end 14 of a fluorescent lamp glass envelope, the method comprising the steps of providing an annular end portion on a wall portion of 16 the glass envelope, pressing a base shell member of a cup-shape 17 configuration onto the end portion of the envelope, and applying 18 a collar of wrap material to the envelope end portion and the 19 base shell member, the wrap material having an adhesive on an interior surface of the collar,. to fix the base shell member on 21 the envelope end portion.
22 The above and other features of the invention, including 23 various novel details of construction and combinations of parts 24 and method steps will now be more particularly described with reference to the accompanying drawings and pointed out in the 26 claims. It will be understood that the particular devices and 27 method steps embodying the invention are shown by way of 28 illustration only and not as limitations of the invention. The 1 principles and features of this invention may be employed in 2 various and numerous embodiments without departing from the scope 3 of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
6 Reference is made to the accompanying drawings in which is 7 shown an illustrative embodiment. of the invention, from its which 8 novel features and advantages will be apparent.
9 In the drawings:
FIG. 1 is a side elevational, partly sectional, view of an 11 end portion of a fluorescent lamp, showing one form of base 12 member attachment to the lamp envelope, illustrative of an 13 embodiment of the invention;
14 FIG. 2 is similar to FIG. 1, but illustrative of an alternative embodiment;
16 FIGS. 3 and 4 are exploded perspective views of the 17 components of the base member attachment means of FIGS. 2;
1 and 18 and 19 FIG. 5 is a perspective view of the assembled components of the base members attachment means of FIGS. 1 - 4.
2 Referring to FIG. 1, it will be seen that a fluorescent lamp 3 10 comprising a tubular vitreous or glass envelope 12 is provided 4 with an inner coating of phosphor 14 and is hermetically sealed S at each end by a glass mount 16. Each mount 16 includes a stem 6 press 18 within which a pair of lead wires 20 are sealed. A
7 thermionic electrode 22 is mounted on the inner ends of lead 8 wires 20 within the tubular glass envelope 12. Each thermionic 9 electrode 22 comprises a tungsten coil coated with an emissive material of alkaline earth oxides.
11 In accordance with standard lamp-making practices, the 12 envelope 12 is filled with a su=table starting gas and doped with 13 mercury to provide an ionizable medium within the sealed 14 envelope, which permits an electric discharge to pass between the thermionic electrodes.
16 Each end portion 24 of the lamp envelope 12 may include an 17 annular groove 34 which terminates at an annular rim or seal 38.
18 Each of the sealed end portions 24 of envelope 12 is fitted with 19 a base 30 that includes a pair of axially-extending metal base pins 32, or other form of contacts, which serve as terminals for 21 the lamp 10 and are adapted, by virtue of their spacing and 22 dimensions, to permit the lamp to be inserted into the socket 23 components of a lighting fixture and be operated from a suitable 24 electrical power supply. Each lead wire 20 extends through the stem press 18 in mount 16 to a respective metal base pin 32.
26 Base 30 includes a metallic base shell 42 having an annular 27 flange 44. When the base 30 is secured to the lamp end portion in 28 a manner to be described below, an inner surface 40 of the 1 annular flange 44 contacts the lamp end portion 24 and when the 2 end portion includes the seal 38, contacts the annular seal 38.
3 Base shell 42 is formed of a suitable metal, such as aluminum.
4 The base shell 42 may be provided with an inwardly-directed annular ridge (not shown) for engaging the groove 34.
6 A disk 46 of insulating material is secured to base shell 7 42. The base pins 32 are received in registering apertures 8 formed in the insulating disk 46. Each of the base pins 32 is 9 provided with a flange portion 48 engaging the lower surface of disk 46, the base pin inner ends being swaged or riveted into 11 contact with the upper surface of disk 46, thus rigidly securing 12 the pins in position.
13 While the base 30 is shown including two base pins, any 14 number of pins may be used depending upon the type of lamp.
While only one insulator disk is used in the base illustrated, 16 each base pin may be mounted on separate insulating disks.
17 To secure the base shell 42 to the envelope 12, the base 18 shell member 42 is pressed onto the end portion 24 of the 19 envelope 12. A collar 60 of shrink wrap material is fitted around the annular end portion 24 of the envelope 12, and around 21 the flange 44 of the base shell member 42. The collar 60 is 22 shrunken, as by the application of heat, to compress against the 23 envelope end portion 24, and the base shell member flange 44, to 24 urge the shell member flange 44 against envelope end portion 24, including the seal 38, if present, to fix the base shell member 26 42 on the envelope end portion 24.
27 Alternatively, or in combination with the above, the collar 28 60 may be provided with a layer of adhesive 62 (FIG. 2) on an 1 interior surface 64 thereof. In this embodiment, the collar 60 2 is adhered to the glass envelope end portion 24 and the base 3 member flange portion 44, with which the adhesive 62 is 4 contiguous, to fix the base shell member 42 on the envelope end portion 24. The adhesive 62 may be heat curable, in which case 6 the adhesive is cured by the application of hot air, or the like, 7 to bond with the envelope end portion 24 and the base shell 8 flange 44 to fix the shell member 42 on the glass envelope end 9 portion 24.
There is thus provided a fluorescent lamp in which a base 11 member is fixed to a lamp envelope end portion in a manner and by 12 way of a method requiring little machinery, and reduced time and 13 costs relative to prior methods.
14 It will be understood that many additional changes in the details, materials, steps and arrangement of parts, which have 16 been herein described and illustrated in order to explain the 17 nature of the invention, may be made by those skilled in the art 18 within the principles and scope of the invention as expressed in 19 the appended claims.
to
Claims (23)
1. A fluorescent lamp comprising:
a glass envelope having a sealed end portion;
a base shell member of a cup-shape configuration adapted to engage the envelope end portion; and a collar of shrink wrap material disposed around the envelope end portion and sides of the base shell member, the shrink wrap material being shrunken and compressing against the envelope end portion and the base shell member, to fix the base shell member on the envelope end portion.
a glass envelope having a sealed end portion;
a base shell member of a cup-shape configuration adapted to engage the envelope end portion; and a collar of shrink wrap material disposed around the envelope end portion and sides of the base shell member, the shrink wrap material being shrunken and compressing against the envelope end portion and the base shell member, to fix the base shell member on the envelope end portion.
2. The lamp in accordance with claim 1 and further comprising insulating means secured to said base shell member.
3. The lamp in accordance with claim 1 and further comprising an adhesive disposed on an interior surface of said collar and contiguous with the glass envelope end portion and said base shell member.
4. The lamp in accordance with claim 2 wherein said base shell member is of metal.
5. The lamp in accordance with claim 3 wherein said adhesive is curable adhesive.
6. The lamp in accordance with claim 5 wherein the shrink wrap material is heat shrunk and said adhesive is heat cured.
7. The lamp in accordance with claim 1 wherein the shrink wrap material is heat shrunk.
8. A method for attaching a base member to an end of a fluorescent lamp glass envelope, the method comprising the steps of:
providing an annular end portion on an external wall portion of the glass envelope;
pressing a base shell member of a cup-shape configuration onto the end portion of the envelope;
applying a collar of shrink wrap material to the envelope end portion and the base shell member; and shrinking the collar to compress against the envelope end portion and the base shell member, to fix the base shell member en the envelope end portion.
providing an annular end portion on an external wall portion of the glass envelope;
pressing a base shell member of a cup-shape configuration onto the end portion of the envelope;
applying a collar of shrink wrap material to the envelope end portion and the base shell member; and shrinking the collar to compress against the envelope end portion and the base shell member, to fix the base shell member en the envelope end portion.
9. The method in accordance with claim 8 and comprising the further step of providing an adhesive on an interior surface of the collar.
10. The method in accordance with claim 9 wherein the adhesive is curable adhesive and the method includes a further step of curing the adhesive after applying the collar to the envelope end portion and the base shell member.
11. The method in accordance with claim 8 wherein shrinking the collar comprises applying heat to the collar to heat shrink the collar.
12. The method in accordance with claim 10 wherein the adhesive is cured by the application of heat and the collar is shrunken by the application of heat.
13. A fluorescent lamp comprising:
a glass envelope having a sealed end portion;
a base shell member of a cup-shape configuration adapted to engage the envelope end portion;
a collar of wrap material disposed around the envelope end portion and shades of the base shell member; and an adhesive disposed on an interior surface of said collar and contiguous with the glass envelope end portion and said base shell member, to fix said base shell member on the envelope end portion.
a glass envelope having a sealed end portion;
a base shell member of a cup-shape configuration adapted to engage the envelope end portion;
a collar of wrap material disposed around the envelope end portion and shades of the base shell member; and an adhesive disposed on an interior surface of said collar and contiguous with the glass envelope end portion and said base shell member, to fix said base shell member on the envelope end portion.
14. The lamp in accordance with claim 13 and further comprising insulating means secured to said base shell member.
15. The lamp in accordance with claim 14 wherein said base shell member is of metal.
16. The lamp in accordance with claim 13 wherein said adhesive is cured adhesive.
17. The lamp in accordance with claim 13 wherein said collar is of a shrink wrap material and is shrunken on the glass envelope end portion and said base shell member.
18. The lamp in accordance with claim 16 wherein said adhesive is heat curable and said collar is of shrink wrap material which is heat shrinkable.
19. A method for attaching a base member to an end of a fluorescent lamp glass envelope, the method comprising the steps of:
providing an annular end portion on a wall of the glass envelope;
pressing a base shell member of a cup-shape configuration onto the end portions of the envelope; and applying a collar of wrap material to the envelope end portion and the base shell member, the wrap material having a layer of adhesive on an interior surface thereof to fix the base shell member on the envelope end portion.
providing an annular end portion on a wall of the glass envelope;
pressing a base shell member of a cup-shape configuration onto the end portions of the envelope; and applying a collar of wrap material to the envelope end portion and the base shell member, the wrap material having a layer of adhesive on an interior surface thereof to fix the base shell member on the envelope end portion.
20. The method in accordance with claim 19 wherein the adhesive is curable adhesive and the method comprises a further step of curing the adhesive after applying the collar to the envelope end portion and the base shell member.
21. The method in accordance with claim 19 wherein the collar is of a shrink wrap material and the method comprises a further step of shrinking the collar onto the envelope end portion and the base shell member.
22. The method in accordance with claim 20 wherein curing the adhesive comprises heat curing the adhesive.
23. The method in accordance with claim 21 wherein shrinking the collar comprises heat shrinking the collar.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/077,254 | 2002-02-15 | ||
| US10/077,254 US6794811B2 (en) | 2002-02-15 | 2002-02-15 | Fluorescent lamp and method for attaching a base member to an end of same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2411560A1 true CA2411560A1 (en) | 2003-08-15 |
Family
ID=27732617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002411560A Abandoned CA2411560A1 (en) | 2002-02-15 | 2002-11-12 | A fluorescent lamp and method for attaching a base member to an end of same |
Country Status (2)
| Country | Link |
|---|---|
| US (2) | US6794811B2 (en) |
| CA (1) | CA2411560A1 (en) |
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| JP2007528094A (en) * | 2003-04-23 | 2007-10-04 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Electric lamp and base |
| US7619352B2 (en) * | 2004-03-04 | 2009-11-17 | Koninklijke Philips Electronics N.V. | Fluorescent lamp and method for manufacturing the same |
| US9497821B2 (en) | 2005-08-08 | 2016-11-15 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US20080150430A1 (en) * | 2006-12-22 | 2008-06-26 | Enterkin Roger B | Protective tube for a fluorescent lamp and method |
| US9879852B2 (en) | 2014-09-28 | 2018-01-30 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US9945520B2 (en) | 2014-09-28 | 2018-04-17 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| WO2016086901A2 (en) | 2014-12-05 | 2016-06-09 | Jiaxing Super Lighting Electric Appliance Co., Ltd | Led tube lamp |
| US9587817B2 (en) | 2014-09-28 | 2017-03-07 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US9794990B2 (en) | 2014-09-28 | 2017-10-17 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp with improved compatibility with an electrical ballast |
| US10634337B2 (en) | 2014-12-05 | 2020-04-28 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp with heat dissipation of power supply in end cap |
| US9618168B1 (en) | 2014-09-28 | 2017-04-11 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US9447929B2 (en) | 2014-09-28 | 2016-09-20 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US9885449B2 (en) | 2014-09-28 | 2018-02-06 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US9629211B2 (en) | 2014-09-28 | 2017-04-18 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp with improved compatibility with an electrical ballast |
| US10021742B2 (en) | 2014-09-28 | 2018-07-10 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
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| US9521718B2 (en) | 2014-09-28 | 2016-12-13 | Jiaxing Super Lighting Electric Appliance Co., Lti | LED tube lamp having mode switching circuit |
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| US9618166B2 (en) | 2014-09-28 | 2017-04-11 | Jiaxing Super Lighting Electric Applianc Co., Ltd. | LED tube lamp |
| US9526145B2 (en) | 2014-09-28 | 2016-12-20 | Jiaxing Super Lighting Electric Appliance Co., Lti | LED tube lamp |
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| CN106032880B (en) * | 2014-09-28 | 2019-10-25 | 嘉兴山蒲照明电器有限公司 | LED light source and LED daylight lamp |
| US10514134B2 (en) | 2014-12-05 | 2019-12-24 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| SG11201704273RA (en) | 2014-12-05 | 2017-06-29 | Jiaxing Super Lighting Electric Appliance Co Ltd | Led tube lamp |
| US9955587B2 (en) | 2015-04-02 | 2018-04-24 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp |
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- 2002-02-15 US US10/077,254 patent/US6794811B2/en not_active Expired - Fee Related
- 2002-11-12 CA CA002411560A patent/CA2411560A1/en not_active Abandoned
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2003
- 2003-09-18 US US10/667,030 patent/US7033239B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US7033239B2 (en) | 2006-04-25 |
| US20040056581A1 (en) | 2004-03-25 |
| US6794811B2 (en) | 2004-09-21 |
| US20030155858A1 (en) | 2003-08-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |