US3858162A - Snap-lock base for annular fluorescent lamps - Google Patents

Snap-lock base for annular fluorescent lamps Download PDF

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Publication number
US3858162A
US3858162A US00358790A US35879073A US3858162A US 3858162 A US3858162 A US 3858162A US 00358790 A US00358790 A US 00358790A US 35879073 A US35879073 A US 35879073A US 3858162 A US3858162 A US 3858162A
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US
United States
Prior art keywords
base
flaps
snap
recessed
accordance
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.)
Expired - Lifetime
Application number
US00358790A
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English (en)
Inventor
G Mai
H Pietzsch
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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
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Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of US3858162A publication Critical patent/US3858162A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/05—Two-pole devices
    • H01R33/06—Two-pole devices with two current-carrying pins, blades or analogous contacts, having their axes parallel to each other
    • H01R33/08—Two-pole devices with two current-carrying pins, blades or analogous contacts, having their axes parallel to each other for supporting tubular fluorescent lamp
    • H01R33/0809—Two-pole devices with two current-carrying pins, blades or analogous contacts, having their axes parallel to each other for supporting tubular fluorescent lamp having contacts on one side only

Definitions

  • the invention relates to a base for annular fluorescent lamps, preferably for lamps provided with metal end caps.
  • the base comprises two thin-walled semicylindrical parts that are molded from resilient plastic and are shaped to interlock with a snapfit.
  • One of the base parts carries four metallic contact pins and the other serves as a cover for the lead-in wires and the end portions of the lamp envelope.
  • the snap-fitting portions of the base parts are so shaped that the base can be reopened with a special tool.
  • the base also provides a chamber that is large enough to accommodate exhaust tubulations that would otherwise be too long or eccentric.
  • the base structure in accordance with U.S. Pat. No. 2,453,986 includes, among other things, means for protection from distortion or displacement relative to the lamp. Due to the screw plug, there is, however, no hollow space left in the base. Furthermore, since the contact pins of such bases are inclined 30 relative to the annular plane, these bases do not meet the socket standards established in Europe, for example, which require that the contact pins be inclined 45 relative to the annular plane.
  • base types which have a snap-fit closure are also known (see Jap. Utility Model 46-15-989).
  • this type of closure does not permit a reopening of the mounted base. Due to the design of the snap-fit closure, a small hollow chamber is provided in the base interior but the length of the chamber is quite limited. The bottom carrying the contact pins is only slightly recessed in the outer wall of the base. Thus, connections between such bases and sockets which meet the aforesaid standards do not guarantee protection from electric shock hazards. Moreover, this type of base has no means for protection from displacement and distortion.
  • An object of the present invention is to provide a base for annular fluorescent lamps, preferably lamps having metal end caps, which meets the aforesaid standards as regards pin orientation and permits the basing of annular lamps that have long tipped-off exhaust tubes which also enables the bases of defective lamps to be removed and salvaged.
  • the base in two component parts that are joined by a snapfit closure without any screws or rivets in a manner such that the closed base can be reopened with a special tool, that the two joined semi-cylindrical base parts provide a long hollow chamber, that the bottom of one of the base parts which carries the contact pins projects into the chamber a length such that the lead-in wires are spaced a sufficient distance from the metal end caps of the lamp, and that the base is protected from distortion and displacement relative to the lamp.
  • the bottom segment which carries the contact pins is recessed in the base wall and the contact pins are riveted into this segment.
  • the latter is preferably square-shaped and the base parts are preferably molded from a high-temperature resistant and resilient plastic.
  • the snap-fit closure is formed by flaps which are so located in the base wall that the interior of the base is substantially unobstructed. This permits a larger tolerance in the manufacture of the exhaust tube of the annular lamp with regard to its length and to the angle which is formed between the exhaust tube and the lamp axis. Consequently, the previously required posttreatment of the exhaust tube can be omitted, and manufacture of the lamp is rendered less expensive.
  • a great advantage of the invention is the possibility to reopen the snap-fit closure with the aid of a tool and to detach the base again from a defective lamp in order to reuse the base. Protection from distortion and displacement of the base is achieved by short longitudinal ribs and semicircular transverse ribs.
  • the arrangement of the contact pins with regard to the annular plane as well as the optimum recessing of the bottom which carries the contact pins are such that the base is adapted to European socket standards.
  • the improved base encloses the leadin wires and lamp end portions provided with metallic end caps and thus provides protection from electric shock hazards. Moreover, opening of the base is only possible when the base is not inserted in a socket.
  • the lead-in wires cannot contact the end caps and therefore need not be electrically insulated.
  • FIG. 1 is a perspective view of the base parts in opened condition
  • FIG. 2 is a plan view of the base in closed condition
  • FIG. 3 is a side elevational view of the closed base, partly in section.
  • the base structure is adapted to the arc shape of an annular fluorescent lamp.
  • the two base parts 1 and 2 accordingly each have a longer Iongitudinal edge 3 and 4, respectively, and a shorter longitudinal edge 5 and 6, respectively.
  • the covering flap 7 of the longitudinal edge 3 and the recessed flap 8 of the longitudinal edge 4, as well as the covering flap 9 of the longitudinal edge 5 and the recessed flap 10 of the longitudinal edge 6, form the two pairs of interlocking flaps.
  • the inner sides of the covering flaps 7 and 9 are each provided with a short longitudinal rib 11 and the recessed flaps 8 and are each provided with a wedge 12.
  • the wedges 12 each have a flattened end portion 13 that projects beyond the front edges 14 of the recessed flaps 8 and 10.
  • the elevated wedge end portions 15 steeply drop toward the exterior surfaces of respective flaps 8 and 10.
  • the covering flaps 7 and 9 have reinforced lateral edges 16. Accordingly, the width of wedge 12 is reduced with regard to the respective recessed flaps 8 and 10 by the total width of the two lateral edges 16.
  • the reinforced lateral edges 16 thus form a strutting for the covering flaps 7 and 9. Furthermore, they prevent a misalignment of the two semicylindrical base parts with regard to one another, since the exterior lateral faces of 16 closely abut the faces 17 of flaps 8 and 10.
  • the front edge of the covering flap 7 of the longitudinal edge 3 is provided with a small recess 18 that defines a notch-like opening.
  • Two semi-circular transverse ribs 20 extend along the inner surface of base wall 19 of the base part 1. Since the bottom segment 21 which carries the contact pins is recessed in the base wall 19 of the other base part 2 from outside, the square-shaped recess forms a corresponding elevation in the chamber 22 defined by the base. In closed condition of the base, the side walls 23 of said elevation together with the transverse ribs 20 form buffers for the metal end caps of the tubular ends of the lamp envelope. Straps 24 which are provided with a slightly arc-shaped bulging and are suited in front of side walls 23 serve as a support for the end caps. The bottom segment 21 projects into the base chamber 22 a length such that the lead-in wires cannot get into contact with the end caps of the lamp.
  • the covering flaps 7 and 9 of base part 1 fit into the rectangular recesses in the exterior base wall 19 and form a smooth continuous surface with base part 2.
  • the contact pins 25 are riveted into bottom segment 21 which is recessed in the base wall 19 from outside, I
  • the sectional view shown in FIG. 3 through one of the interlocked pairs of flaps 9, 10 illustrates the closing mechanism.
  • the parts 1 and 2 are elastically widened during this operation so that, after passing across the steeply dropping elevated wedge end 15, the longitudinal rib 11 snaps behind 15 and comes to rest on the surface of the recessed flap 10.
  • the elastic base thereby resumes its original shape.
  • the transverse ribs 20 of base part 1 project only slightly into the base interior so that a large hollow chamber 22 is formed.
  • the side walls 23 of bottom segment 21 of base part 2 which carries the contact pins 25 project slightly further into the chamber.
  • the base walls 19 of both base parts 1 and 2 are quite thin and of substantially uniform thickness, as shown in FIGS. 1 and 3.
  • transverse ribs 20 Another section immediately behind one of the transverse ribs 20 (see FIG. 3) shows the two short longitudinal ribs 26 which extend up to said transverse rib 20 along the inner surface of the wall 19 of base part 1. These longitudinal ribs 26, between which the locking tab secured to the respective end caps is situated, afford protection of the base from distortion relative to the lamp.
  • the closed base can be readily opened by introducing a special tool into the recess 18 of covering flap 7. By lifting flap 7, the longitudinal rib 11 is lifted over the elevated wedge end 15. The two base parts can then be separated from one another.
  • a base for an annular fluorescent lamp having an envelope with a protruding exhaust tube comprising;
  • each of said base components having walls of such thickness and being of such configuration that they define, when snap-fitted together in assembled relation, a chamber of sufiicient size to accommodate the ends of the lamp envelope and exhaust tube despite variations in the length and alignment of said exhaust tube,
  • said interfitting portions comprising a pair of covering flaps that laterally project beyond the longitudinal edges of one of said base components and a pair of mating recessed flaps that laterally project beyond the longitudinal edges of the other of said base components and define recesses in the exterior wall thereof which are shaped and dimensioned to receive and accommodate said covering flaps,
  • one of said covering flaps having a notch-like opening in its longitudinal edge through which the base components can be mechanically separated from snap-fitted relationship with one another, and
  • said covering flaps being of such configuration that they form a substantially smooth exterior surface with the base component having the recessed flaps, when said base components are snap-fitted together and said covering flaps are seated in said recesses.
  • a base in accordance with claim 2 wherein; a longitudinal rib is disposed on the inner side of each of said covering flaps, and each of said recessed flaps has a wedge-shaped element that is disposed to engage and interlock with one of said ribs when the base components are pressed together.
  • each of said covering flaps have reinforced lateral edges that are spaced to accommodate the wedge-shaped elements of said recessed flaps.
  • each of said base components are composed of a resilient high-temperature resistant plastic.

Landscapes

  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US00358790A 1972-05-19 1973-05-09 Snap-lock base for annular fluorescent lamps Expired - Lifetime US3858162A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7218982U DE7218982U (de) 1972-05-19 1972-05-19 Sockel für ringförmige Leuchtstofflampen

Publications (1)

Publication Number Publication Date
US3858162A true US3858162A (en) 1974-12-31

Family

ID=6630409

Family Applications (1)

Application Number Title Priority Date Filing Date
US00358790A Expired - Lifetime US3858162A (en) 1972-05-19 1973-05-09 Snap-lock base for annular fluorescent lamps

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US (1) US3858162A (de)
DE (1) DE7218982U (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002394A (en) * 1975-10-10 1977-01-11 General Electric Company Single latch snap-lock base for annular fluorescent lamps
US4482944A (en) * 1983-02-18 1984-11-13 Roossine Isaiah C Flexible light strip assembly
US4552394A (en) * 1981-06-17 1985-11-12 Kesselman David A Tamper indicator
US5204580A (en) * 1988-09-20 1993-04-20 Toshiba Lighting & Technology Corporation Ring-shaped lamp device having bulb tiltable relative to base structure
US6031324A (en) * 1997-03-31 2000-02-29 Matsushita Electric Industrial Co., Ltd. Annulus fluorescent lamp
US20050247718A1 (en) * 2001-12-28 2005-11-10 Maxwell Bushby Thermoplastic can
US20100106094A1 (en) * 2008-10-28 2010-04-29 Medical Components, Inc. Venous access port assembly and method of assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453986A (en) * 1945-05-07 1948-11-16 Gen Electric Circular electric lamp
US2597666A (en) * 1947-11-05 1952-05-20 Gen Electric Movable contact base
US2626977A (en) * 1947-11-05 1953-01-27 Gen Electric Movable contact base
US2733417A (en) * 1952-10-30 1956-01-31 Metal sleeve base for double ended tubular lamp
US2802191A (en) * 1953-10-29 1957-08-06 Westinghouse Electric Corp Base for electric lamp
US3471825A (en) * 1967-03-20 1969-10-07 Amp Inc Coax patch panel in insulative housing members therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453986A (en) * 1945-05-07 1948-11-16 Gen Electric Circular electric lamp
US2597666A (en) * 1947-11-05 1952-05-20 Gen Electric Movable contact base
US2626977A (en) * 1947-11-05 1953-01-27 Gen Electric Movable contact base
US2733417A (en) * 1952-10-30 1956-01-31 Metal sleeve base for double ended tubular lamp
US2802191A (en) * 1953-10-29 1957-08-06 Westinghouse Electric Corp Base for electric lamp
US3471825A (en) * 1967-03-20 1969-10-07 Amp Inc Coax patch panel in insulative housing members therefor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002394A (en) * 1975-10-10 1977-01-11 General Electric Company Single latch snap-lock base for annular fluorescent lamps
US4552394A (en) * 1981-06-17 1985-11-12 Kesselman David A Tamper indicator
US4482944A (en) * 1983-02-18 1984-11-13 Roossine Isaiah C Flexible light strip assembly
US5204580A (en) * 1988-09-20 1993-04-20 Toshiba Lighting & Technology Corporation Ring-shaped lamp device having bulb tiltable relative to base structure
US6031324A (en) * 1997-03-31 2000-02-29 Matsushita Electric Industrial Co., Ltd. Annulus fluorescent lamp
US20050247718A1 (en) * 2001-12-28 2005-11-10 Maxwell Bushby Thermoplastic can
US7419068B2 (en) * 2001-12-28 2008-09-02 Maxwell Bushby Thermoplastic can
US20100106094A1 (en) * 2008-10-28 2010-04-29 Medical Components, Inc. Venous access port assembly and method of assembly
AU2009320117B2 (en) * 2008-10-28 2015-06-18 Medical Components, Inc. Venous access port assembly and method of assembly
US9149620B2 (en) * 2008-10-28 2015-10-06 Medical Components, Inc. Venous access port assembly and method of assembly

Also Published As

Publication number Publication date
DE7218982U (de) 1973-03-29

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