US3898506A - Incandescent filament lamps - Google Patents

Incandescent filament lamps Download PDF

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Publication number
US3898506A
US3898506A US458976A US45897674A US3898506A US 3898506 A US3898506 A US 3898506A US 458976 A US458976 A US 458976A US 45897674 A US45897674 A US 45897674A US 3898506 A US3898506 A US 3898506A
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United States
Prior art keywords
cap
lugs
envelope
pinch seal
seal
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Expired - Lifetime
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US458976A
Inventor
John Willoughb Wright
Legal Executor By Audre Wright
Legal Executor By Denis Clarke
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Thorn Electrical Industries Ltd
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Thorn Electrical Industries Ltd
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Priority to US458976A priority Critical patent/US3898506A/en
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Publication of US3898506A publication Critical patent/US3898506A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/42—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp
    • H01K1/46—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp supported by a separate part, e.g. base, cap
    • H01K1/48—Removable caps

Definitions

  • the present invention relates to the provision of cap connectors for the pinch sealed envelopes'of lamps, such as, for example, fluorescent lamps, discharge lamps and incandescent filament lamps.
  • lamp envelopes should be closed with a pinch seal through which terminal leads for connections to filaments or electrodes would be sealed.
  • a pinch seal could be plugged directly into a socket thus dispensing with the need to seal a conductive cap onto the end of the envelope.
  • the introduction of such a lamp would require replacement of all existing sockets by sockets adapted to receive pinch sealed lamps. This amount of obsolescence would not be acceptable in, for example, the field of domestic lighting, where it would involve the replacement of many millions of light fittings. It is however clear that considerable manufacturing advantages could be obtained if lamps were pinch sealed.
  • a lamp having an envelope closed by a pinch seal through which terminal leads for the lamp extend and a cap within which are provided one or more seating structures cooperating with the pinch seal to seat the envelope in the cap, portions of the terminal leads extending beyond the envelope being secured to the cap so as to prevent the envelope from moving axially relative to the cap.
  • an incandescent filament lamp in a preferred form of the invention includes an envelope formed with a wedge-shaped pressed pinch seal, the thin end of the seal being the end remote from the filament. and a cap within which are disposed one or more seating structures which co-operate with the sides of the wedgeshaped seal to seat the envelope in the cap.
  • the pinch seal tapers on one or both sides from its centre portion towards one or both of its edges.
  • the seating structure may include portions of a shape complementary to the shape of the seal whereby a face to face contact between the seal and the seating structure is maintained when the envelope is seated in the cap.
  • the seating structures may be constituted by internally extending lugs formed by making cuts in the cap and bending inwards the section of the cap thus freed.
  • FIG. 1 is an exploded view of a first embodiment of the invention showing the cap and the envelope,
  • FIG. 2 is a side elevation in part section of a second embodiment
  • FIG. 3 is a plan along III-III in FIG. 2,
  • a glass envelope 11 has a bulbous portion 12 and a tapering portion 13.
  • the tapering portion 13 has a wedge-shaped pressed pinch seal 14.
  • Two leads 15 for the filament 16 of the lamp extend through the closed end of the seal 14.
  • a cap 17 in which the envelope is seated has a base 18 and a side-wall 19, two pairs of lugs 21, 22 and 23, 24 respectively securing the envelope 11 in position in the cap 17.
  • Each lug 21, 22, 23 and 24 is formed by making a V-shaped cut in the side wall 19 and bending the freed '2 section inwardly along the linejoining the ends of the arms of the V-shaped out;
  • the lugs 21,22 and 23, 24 thus form seatings that cooperate with the sides of the pinch seal 14 of the envelope II.
  • the lugs of each pair 21, 22 and 23, 24 are closer together at their ends nearer the closed end of the cap 17.
  • the lead wires 15 pass through holes (not shown) in the base 18 of the cap 17, and are soldered or welded to the cap 17.
  • the lugs 21 to 24 prevent rotational movement of the envelope and axial movement is prevented by the securing of the lead wires 15 to the cap 17.
  • FIGS. 2 and 3 each part is given the same reference numeral as the corresponding part in FIG. I.
  • the lamp comprises an envelope 1] having a tapering portion 13 with a wedge-shaped pressed pinch seal 14.
  • Two leads 15 for the filament extend through the closed end of the seal.
  • the envelope is mounted in a cap 17 and seated in the cap 17 by two pairs of lugs 21, 22 and 23, 24 respectively.
  • the lugs are flat and have a complementary taper to the taper of the seal 14.
  • the leads 15 pass through holes in the base 18 of the cap 17 and are soldered or welded to the cap.
  • the lead wires can be stiffened-up to make this joint more sccure.
  • caps shown in the drawings are bayonet caps; however it is clear that other types of caps could be used, eg Edison screw caps, or 2 pin caps.
  • An electric lamp comprising an envelope having a pinch seal at one end thereof;
  • seating means including a plurality of lugs extending inwardly of said cap and abutting said pinch seal to prevent rotational movement of said envelope, said at least one lead wire being fixedly attached near its outer end to said cap to hold said seal against I said lugs and to prevent said envelope from moving axially relative to said cap.
  • said cap has a closed end
  • said lugs comprise two pairs of lugs, the lugs of each pair being closer together at their ends nearer the closed end of said cap.
  • portions of said lugs have a shape complementary to the shape of said pinch seal whereby a face to face contact is maintained between said seal and said lug portions.
  • a lamp as claimed in claim I wherein said lugs are formed by making cuts in said cap and bending inwards the sections of said cap thus freed.
  • An incandescent filament lamp comprising an envelope having a wedge-shaped pinch seal at one end thereof, the thin end of the wedge being the end remote from the filament;

Abstract

An incandescent filament lamp having an envelope closed with a wedge-shaped pinch seal and a cap disposed about the seal. Cuts are made in the cap and portions thus freed are bent inwards to provide a seating structure for the seal.

Description

United States Patent Wright, deceased et al.
Aug. 5, 1975 INCANDESCENT FILAMENT LAMPS Inventors: John Willoughby Thomas Wright,
deceased, late of Leicester. England; by Audrey Mabel Wright. legal executor: by Denis Wilfred Clarke legal executor. both of Leicester. England Assignee: Thorn Electrical Industries Limited,
London, England Filed: Apr. 8, 1974 App]. No.: 458,976
Related U.S. Application Data Continuation of Ser. No. 827,497, May 23 1969. abandoned.
US. Cl. 313/318; 339/144 R Int. Cl. HOlj 5/48 Field of Search 313/317, 318; 339/144 R,
339/144 T. 145 R145 D, 145 T, 146
[56] References Cited UNITED STATES PATENTS 3,327.28} 6/1967 Anderson et al. 313/3111 x 3.573.534 4/1971 Leighton 31 3111 FOREIGN PATENTS OR APPLICATIONS 688.491 3/1933 United Kingdom 33 1/144 R Primary l;'.\un1incrPaul A. Sacher AUG/710), Agent, or Firn1-R0bert F. OConnell [57] ABSTRACT An incandescent filament lamp having an envelope closed with a wedge-shaped pinch seal and a cap disposed about the seal. Cuts are made in the cap and portions thus freed are bent inwards to provide a seating structure for the seal.
5 Claims, 3 Drawing Figures 1 INCANDESCENT FILAMENT LAMPS This is a continuation ofapplication Ser. No. 827,497, filed May 23, 1969, now abandoned.
The present invention relates to the provision of cap connectors for the pinch sealed envelopes'of lamps, such as, for example, fluorescent lamps, discharge lamps and incandescent filament lamps.
It has been proposed that lamp envelopes should be closed with a pinch seal through which terminal leads for connections to filaments or electrodes would be sealed. Such a pinch seal could be plugged directly into a socket thus dispensing with the need to seal a conductive cap onto the end of the envelope. However, the introduction of such a lamp would require replacement of all existing sockets by sockets adapted to receive pinch sealed lamps. This amount of obsolescence would not be acceptable in, for example, the field of domestic lighting, where it would involve the replacement of many millions of light fittings. It is however clear that considerable manufacturing advantages could be obtained if lamps were pinch sealed.
According to the present invention there is provided a lamp having an envelope closed by a pinch seal through which terminal leads for the lamp extend and a cap within which are provided one or more seating structures cooperating with the pinch seal to seat the envelope in the cap, portions of the terminal leads extending beyond the envelope being secured to the cap so as to prevent the envelope from moving axially relative to the cap.
In a preferred form of the invention an incandescent filament lamp includes an envelope formed with a wedge-shaped pressed pinch seal, the thin end of the seal being the end remote from the filament. and a cap within which are disposed one or more seating structures which co-operate with the sides of the wedgeshaped seal to seat the envelope in the cap.
Advantageously, the pinch seal tapers on one or both sides from its centre portion towards one or both of its edges.
The seating structure may include portions ofa shape complementary to the shape of the seal whereby a face to face contact between the seal and the seating structure is maintained when the envelope is seated in the cap.
The seating structures may be constituted by internally extending lugs formed by making cuts in the cap and bending inwards the section of the cap thus freed.
.Embodiments of the invention will now be described, by way of example with reference to the accompanying drawings, in which:
FIG. 1 is an exploded view of a first embodiment of the invention showing the cap and the envelope,
FIG. 2 is a side elevation in part section of a second embodiment,
FIG. 3 is a plan along III-III in FIG. 2,
In FIG. 1 of the drawings, a glass envelope 11 has a bulbous portion 12 and a tapering portion 13. The tapering portion 13 has a wedge-shaped pressed pinch seal 14. Two leads 15 for the filament 16 of the lamp extend through the closed end of the seal 14. A cap 17 in which the envelope is seated has a base 18 and a side-wall 19, two pairs of lugs 21, 22 and 23, 24 respectively securing the envelope 11 in position in the cap 17. Each lug 21, 22, 23 and 24 is formed by making a V-shaped cut in the side wall 19 and bending the freed '2 section inwardly along the linejoining the ends of the arms of the V-shaped out;
The lugs 21,22 and 23, 24 thus form seatings that cooperate with the sides of the pinch seal 14 of the envelope II. The lugs of each pair 21, 22 and 23, 24 are closer together at their ends nearer the closed end of the cap 17.
The lead wires 15 pass through holes (not shown) in the base 18 of the cap 17, and are soldered or welded to the cap 17. The lugs 21 to 24 prevent rotational movement of the envelope and axial movement is prevented by the securing of the lead wires 15 to the cap 17.
The above example relates to one shape of lugs. It is clear that other configurations of the lugs are possible, and one alternative configuration is shown in FIGS. 2 and 3. In FIGS. 2 and 3 each part is given the same reference numeral as the corresponding part in FIG. I.
The lamp comprises an envelope 1] having a tapering portion 13 with a wedge-shaped pressed pinch seal 14. Two leads 15 for the filament (not shown) extend through the closed end of the seal. The envelope is mounted in a cap 17 and seated in the cap 17 by two pairs of lugs 21, 22 and 23, 24 respectively. The lugs are flat and have a complementary taper to the taper of the seal 14.
The leads 15 pass through holes in the base 18 of the cap 17 and are soldered or welded to the cap. The lead wires can be stiffened-up to make this joint more sccure.
The caps shown in the drawings are bayonet caps; however it is clear that other types of caps could be used, eg Edison screw caps, or 2 pin caps.
We claim:
1. An electric lamp comprising an envelope having a pinch seal at one end thereof;
a pair of lead wires extending from the inside to the outside of said envelope,
at least one of said lead wires being sealed through and extending beyond said pinch seal,
a cap disposed about said pinch seal,
seating means including a plurality of lugs extending inwardly of said cap and abutting said pinch seal to prevent rotational movement of said envelope, said at least one lead wire being fixedly attached near its outer end to said cap to hold said seal against I said lugs and to prevent said envelope from moving axially relative to said cap.
2. A lamp as claimed in claim 1, wherein said pinch seal tapers on at least one side from its centre towards at least one edge,
said cap has a closed end, and
said lugs comprise two pairs of lugs, the lugs of each pair being closer together at their ends nearer the closed end of said cap.
3. A lamp as claimed in claim 1, wherein portions of said lugs have a shape complementary to the shape of said pinch seal whereby a face to face contact is maintained between said seal and said lug portions.
4. A lamp as claimed in claim I, wherein said lugs are formed by making cuts in said cap and bending inwards the sections of said cap thus freed.
5. An incandescent filament lamp comprising an envelope having a wedge-shaped pinch seal at one end thereof, the thin end of the wedge being the end remote from the filament;
4 flat sides extending inwardly of said cap and abutting the sides of said wedge shaped pinch seal to prevent rotational movement of said envelope, said lead wires being fixedly attached to said cap to hold said seal against said lugs and to prevent said envelope from moving axially relative to said cap.

Claims (5)

1. An electric lamp comprising an envelope having a pinch seal at one end thereof; a pair of lead wires extending from the inside to the outside of said envelope, at least one of said lead wires being sealed through and extending beyond said pinch seal, a cap disposed about said pinch seal, seating means including a plurality of lugs extending inwardly of said cap and abutting said pinch seal to prevent rotational movement of said envelope, said at least one lead wire being fixedly attached near its outer end to said cap to hold said seal against said lugs and to prevent said envelope from moving axially relative to said cap.
2. A lamp as claimed in claim 1, wherein said pinch seal tapers on at least one side from its centre towards at least one edge, said cap has a closed end, and said lugs comprise two pairs of lugs, the lugs of each pair being closer together at their ends nearer the closed end of said cap.
3. A lamp as claimed in claim 1, wherein portions of said lugs have a shape complementary to the shape of said pinch seal whereby a face to face contact is maintained between said seal and said lug portions.
4. A lamp as claimed in claim 1, wherein said lugs are formed by making cuts in said cap and bending inwards the sections of said cap thus freed.
5. An incandescent filament lamp comprising an envelope having a wedge-shaped pinch seal at one end thereof, the thin end of the wedge being the end remote from the filament; a pair of lead wires sealed through said pinch seal in spaced apart relationship to one another and extending beyond said pinch seal, said lead wires being connected at their inner ends to said filament, a cap disposed about said pinch seal; seating structures including a plurality of lugs having flat sides extending inwardly of said cap and abutting the sides of said wedge shaped pinch seal to prevent rotational movement of said envelope, said lead wires being fixedly attached to said cap to hold said seal against said lugs and to prevent said envelope from moving axially relative to said cap.
US458976A 1969-05-23 1974-04-08 Incandescent filament lamps Expired - Lifetime US3898506A (en)

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US82749769A 1969-05-23 1969-05-23
US458976A US3898506A (en) 1969-05-23 1974-04-08 Incandescent filament lamps

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4256989A (en) * 1978-09-22 1981-03-17 Duro Test Corporation Incandescent lamp with filament mounting means and socket adaptor
US4371807A (en) * 1979-09-21 1983-02-01 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Incandescent lamp with mechanically attached base
US4384236A (en) * 1979-08-17 1983-05-17 U.S. Philips Corporation Electric lamp with a sleeve-shaped cap
US4470104A (en) * 1981-12-24 1984-09-04 General Electric Company Automotive inner-bulb assembly
US4485326A (en) * 1979-10-10 1984-11-27 U.S. Philips Corporation Electric lamp with a sleeve-shaped cap
US4567397A (en) * 1982-06-05 1986-01-28 U.S. Philips Corporation Electric lamp having a light source aligned to a cap
US4603278A (en) * 1984-02-16 1986-07-29 Gte Products Corporation Electric lamp with insulating base
US4724353A (en) * 1984-02-16 1988-02-09 Gte Products Corporation Electric lamp with insulating base
US4837479A (en) * 1984-02-16 1989-06-06 GTE Products Company Electric lamp with insulating base
US5233264A (en) * 1989-07-01 1993-08-03 U.S. Philips Corporation Electric incandescent lamp
US5818154A (en) * 1994-08-10 1998-10-06 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Halogen incandescent lamp in cementless base
US5989067A (en) * 1998-01-30 1999-11-23 Lightolier Halogen lamp pin shroud

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327283A (en) * 1965-03-09 1967-06-20 Sylvania Electric Prod Photoflash lamp
US3573534A (en) * 1968-10-28 1971-04-06 Gen Electric Lamp base and leading-in wire connection

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327283A (en) * 1965-03-09 1967-06-20 Sylvania Electric Prod Photoflash lamp
US3573534A (en) * 1968-10-28 1971-04-06 Gen Electric Lamp base and leading-in wire connection

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4256989A (en) * 1978-09-22 1981-03-17 Duro Test Corporation Incandescent lamp with filament mounting means and socket adaptor
US4384236A (en) * 1979-08-17 1983-05-17 U.S. Philips Corporation Electric lamp with a sleeve-shaped cap
US4371807A (en) * 1979-09-21 1983-02-01 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Incandescent lamp with mechanically attached base
US4485326A (en) * 1979-10-10 1984-11-27 U.S. Philips Corporation Electric lamp with a sleeve-shaped cap
US4470104A (en) * 1981-12-24 1984-09-04 General Electric Company Automotive inner-bulb assembly
US4567397A (en) * 1982-06-05 1986-01-28 U.S. Philips Corporation Electric lamp having a light source aligned to a cap
US4603278A (en) * 1984-02-16 1986-07-29 Gte Products Corporation Electric lamp with insulating base
US4724353A (en) * 1984-02-16 1988-02-09 Gte Products Corporation Electric lamp with insulating base
US4837479A (en) * 1984-02-16 1989-06-06 GTE Products Company Electric lamp with insulating base
US5233264A (en) * 1989-07-01 1993-08-03 U.S. Philips Corporation Electric incandescent lamp
US5818154A (en) * 1994-08-10 1998-10-06 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Halogen incandescent lamp in cementless base
US5989067A (en) * 1998-01-30 1999-11-23 Lightolier Halogen lamp pin shroud

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