US3248685A - Electric lighting arrangement - Google Patents

Electric lighting arrangement Download PDF

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Publication number
US3248685A
US3248685A US229690A US22969062A US3248685A US 3248685 A US3248685 A US 3248685A US 229690 A US229690 A US 229690A US 22969062 A US22969062 A US 22969062A US 3248685 A US3248685 A US 3248685A
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US
United States
Prior art keywords
contact
socket
base
arrangement
lamp
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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
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US229690A
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English (en)
Inventor
Knuppel Fritz
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.)
Vossloh Werke GmbH
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Vossloh Werke GmbH
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
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Publication of US3248685A publication Critical patent/US3248685A/en
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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
    • H01R33/965—Dustproof, splashproof, drip-proof, waterproof, or flameproof holders
    • H01R33/9651—Dustproof, splashproof, drip-proof, waterproof, or flameproof holders for screw type coupling devices

Definitions

  • This invention relates to electric lighting arrangements, and more particularly to a lamp socket and to a corresponding lamp base which are threadedly engageable for transmission of current from the socket to the base in the threadedly engaged operative position of socket and base.
  • the invention is more particularly concerned with a safety arrangement for preventing accidental touching of the current transmitting contacts of the lamp base and of the socket.
  • a central contact of the socket is arranged in an axial recess of an insulating contact carrier, and the lamp base is provided with corresponding axially projecting contact mean-s received in the recess of the socket in the operative position of the arrangement for abutting engagement with While the known socket makes it difficult, or almost impossible accidentally to touch the central contact, the second contact on the lamp base and on the socket is still substantially exposed unless an insulating sleeve or a similar protecting member is provided to enclose the second contact.
  • the conventional lamp and socket arrangements require relatively complex and expensive protective insulating sleeves or the like.
  • the primary object of the invention is the provision of a lighting arrangement of the type described which is simpler than the known arrangement.
  • a more specific object is the elimination of the need for a protective insulating sleeve.
  • Another object is the provision of threadedly engageable lamp bases and lamp sockets in which the engaged threaded portions are electrically insulated from all current carrying members of the lamp and of the socket.
  • FIG. 1 is an axially sectional fragmentary view of the base of an incandescent lamp
  • FIGS. 2, 3, and 4 illustrate modifications of the lamp base of FIG. 1 in corresponding views
  • FIG. 5 shows the contact carrier arrangement of a lamp socket adapted to engage the lamp bases shown in FIGS. 1 and 3, the carrier arrangement being shownin axial section;
  • FIG. 6 is a top view of the contact carrier arrangement of FIG. 5;
  • FIG. 7 shows the same contact carrier arrangement in a bottom view
  • FIG. 8 is an axially sectional view of a lamp base of the invention similar to those shown in FIGS. 2 and and engaged in a conventional Edison type screw socket, the lamp base and socket being shown in section on the common axis;
  • FIG. 9 illustrates a modification of the l-amp'base shown in FIG. 4 engaged in a conforming socket, the view being in axial section;
  • FIG. 10 Illustrates in axial section a modification of the lamp base shown in FIG. 3 engaged in a socket in- 3,248,685 Patented Apr. 26, 1966 cluding a metallic shell and the contact carrier arrangement of FIGS. 5 to 7;
  • FIG. 11 shows the arrangement of a lamp and socket similar to the device illustrated in FIG. 10, but including a socket provided with an insulating shell.
  • FIG. 1 there is seen a portion of an electric incandescent lamp including a base member 1 of thermosetting non-conductive plastic material to which a glass bulb is fastened in a conventional, non-illustrated manner.
  • member 1 is shown, it being understood that the base member is substantially symmetrical with respect to its axis 41.
  • the base end of the lamp will be referred to hereinafter as the lower end of the lamp, and other spatial relationships will be described accordingly, it being understood that such terms as top or bottom do not necessarily indicate a fixed orientation relative to the field of terrestrial gravity.
  • the base member 1 has coarse external threads 42 centered on the axis 41 and conforming to the standards for Edison type screw sockets.
  • a metallic central contact pin 2 projects axially from the bottom face of the base member 1.
  • the pin 2 is tubular and receives the end of a lead 3 in its axial cavity.
  • the lead is conduc' tively connected to the pin 2 by a drop of solder 43 as is conventional.
  • the lead 3 is integral with or otherwise conductively connected to the filament of the lamp, not shown in its entirety.
  • the other filament lead 4 passes through a bore 44 in the base member 1 and is attached by a solder joint 45 to a cylindrical outer contact band 5 of metallic material coaxial with the pin 2 and radially spaced therefrom.
  • the band 5 is fastened to the base member 1.
  • the pin 2 and the band 5 thus constitute the terminals of theinternal lamp circuit which also includes the filament.
  • the modified lamp base shown in FIG. 2 differs from that illustrated in FIG. 1 mainly by the configuration of its outer contact member 6 which has an annular conical portion 46 and a flat annular portion 47.
  • the two portions 46, 47 are integral and conform to the surface of the base member 1.
  • the contact member 6 is attached to the base member 1' 'by an integral beaded edge 48 of the conical portion 46 which engages a corresponding recess in the base member 1.
  • the base member 8 of the lamp base seen in FIG. 3 isaxially shorter than the base member 1.
  • a coaxial metal shell 7 is attached to the base member 8 and is formed into the shape of helical threads substantially identical with the threads 42.
  • the lamp base illustrated in FIG. 3 is so closely similar to that shown in FIG. 1 as to make further description unnecessary.
  • FIG. 4 differs from FIG. 2 as FIG. 3 differs from FIG. 1.
  • an axially shortened base member 8' carrying a threaded metallic shell 7 replaces the base member 1' and its integral threads shown in FIG. 2.
  • FIGS. 5 to 7 A contact carrier arrangement for a socket engageable with the lamp bases shown in FIGS. 1 and 3 is illustrated in FIGS. 5 to 7 in axial section, in top view, and in bottom view respectively.
  • a contact carrier member 9 having the general shape of a circular disc, and made of ceramic insulating material.
  • An axial passage or recess 10 in the carrier member 9 has a diameter only slightly larger than that of the pin 2 which is shown in phantom View in FIG. 5 together with other elements of the lamp bases of FIGS. 1 or 3.
  • a screw terminal 11 recessed in the underside of the carrier member 9 holds a resilient contact blade 12 over the lower orifice of the passage 10 for abutting engagement with the pin 2.
  • FIG. 7 An annular groove 13 in the top face of the carrier Only one half of the lower end of the base arrangement.
  • a second screw terminal 15 mounted in a recess at the underside of the carrier member 9 serves as fastening means for a spring blade 16 which is stirrupshaped as best seen from FIG. 7, and whose free ends project from beneath through openings 14 into the groove 13 for abutting contact with the band 5.
  • the lamp base and contact carrier member are held in their operative position by threaded engagement between the lamp base and an outer shell which envelops the contact carrier member as will become apparent hereinafter.
  • FIG. 9 there is shown a lighting arrangement consisting of a socket and a lamp of which only the base is visible.
  • the lamp base is similar to that illustrated. in FIG. 2, and differs from the latter by a base member 58 which has a central frusto-conical recess 24 coaxial with the pin 2.
  • a conforming frusto-conical projection 23 on the top face of the cooperating contact carrier member 59 engages the recess 24.
  • a central axial passage 22 receives the pin 2 in the operative position illustrated for contact with a blade 12 fastened to the contact carrier member 59 by a coordinated screw terminal in the manner evident from FIG. 5, but not shown in FIG. 9 in order not to crowd the drawing.
  • a second contact blade 25 eccentrically arranged on the carrier member 59 makes contact with an annular contact member 6 on the lamp base.
  • the contact member 59 and the elements supported thereon are enveloped in an outer sheet metal shell having a cup-shaped lower portion 30 and an upper portion 27 of basically cylindrical stepped shape.
  • An internally threaded connector 60 fixedly fastened to the bottom part of the lower shell portion 30 permits the socket to be attached to a tubular lamp support or the like.
  • the approximately cylindrical top part of the lower shell portion 36 is threadedly inserted into a conforming cylindrical bottom part of the upper shell portion 27.
  • the engaged threads on the two shell portions are axially coextensive.
  • the top part 26 of the upper shell portion 27 has a smaller diameter than the bottom portion and is formed into threads coaxial with the engaged threads of the two shell portions, but axially spaced from the same.
  • the top part 26 threadedly receives the metallic threaded shell 7 of the lamp base, whereby the central pin 2 and the outer contact 6 are held in engagement with the corresponding contact elements 12, 25 of the socket.
  • the lower portion 30 of the socket shell has an inwardly projecting integral loop 61 which radially engages a slot 62 in the contact carrier member 59.
  • the upper shell portion 27 carries an internally threaded member 63 in which a screw 28 is axially movable. The head of the screw projects outward of the shell, and its pointed free end engages corrugations 29 on an annular rim of the contact carrier member 59.
  • the loop 61 permanently prevents rotation of the lower shell portion relative to the contact carrier member, and the screw 28 may be rotated by means of a screw driver to lock the upper shell portion against rotation relative to the contact carrier member, thereby preventing accidental opening of the threaded-connection between the shell portions.
  • a short nipple 64 is secured in the lower shell portion 30 in such a manner as to permit insertion of a nonillustrated grounding wire from the outside.
  • a set screw 65 is transversely threadedly movable on the nipple 64, and conductively fastens the grounding wire to the outer socket shell.
  • the embodiment of the invention shown in FIG. combines the lamp base of FIG. 1 with the contact carrier arrangement of FIGS. 5 to 7 with the cooperation of an outer metallic shell consisting of a cup-shaped lower portion 30 and an upper portion 27' of stepped cylindrical shape.
  • the top part 17 of the upper shell portion 27' provides a threaded support for the lamp whose base member 1 is threadedly engaged in the top part 17.
  • a flange 31 on the bottom rim of the upper shell portion 27' supports a lamp shade 32 which is held against the flange 31 by an annular adapter 33 threadedly engaging the bottom part of the upper shell portion 27'.
  • the several threads on the upper shell portion while differing in diameter have identical pitch so that they may be simultaneously formed in a single thread rolling operation.
  • FIGS. 9 and 10 provide good protection against accidental contact of a user with a current carrying part although the outer shell of the socket consists of metal.
  • the outer threads on the lamp base are insulated from the current carrying elements of the lamp.
  • the socket contacts are arranged in such a manner that they cannot make contact with a metallic shell on the lamp base. A transmission of electric potential by the shell of the lamp base to the socket shell is thus relably prevented when the socket of the invention is used with the conforming lamps.
  • the central contact button cannot reach the contact arranged in the central recess or passage in the contact carrier member of the socket.
  • the conventional shell cannot reach the recessed outer contact of the socket shown in FIG. 10, and cannot .be inserted deeply enough into the socket to reach the contact element 25 in FIG. 9 because of abutting engagement of the contact button with the upper terminal face of the projection 23 while the lamp base shell is still spaced from the contact element 25.
  • Known light bulbs equipped with a current carrying screw shell and a pin type second contact can readily be excluded from use with the sockets of the invention by suitably dimensioning the central passage in the contact carrier member. If the passage is made too narrow to accommodate the pin of the known lamp, or too long to permit the contact blade 12 to be reached, a lamp of the last mentioned known type will neither be lighted when inserted in the socket of the invention, nor can it transmit electric potential to a outside face of the socket.
  • the sockets shown in FIGS. 9 and 10 are not apt to transmit an accidental electric shock to a user. All external parts are safe as has been set forth above. A finger inserted into the socket shown in FIG. 10 cannot reach current carrying parts. The conical projection 23 at the bottom of the socket illustrated in FIG. 9 makes it very unlikely that the contact element 25 may be reached accidentally by an inserted finger. It is of course possible to eliminate this danger by connecting the element 25 to that conductor of the current supply which is at ground potential or very close thereto.
  • the screw terminal of the element 25 may be provided with indicia indicating that it be connected to a grounded lead, or the element 25 may be directly grounded through a wire attached to the nipple 64.
  • FIGS. 2 and 4 While conventional lamps cannot be employed with the sockets of the invention, those lamps of the invention which are equipped with an upwardly flaring extension portion on their annular outer contact element in the manner shown in FIGS. 2 and 4 may be employed in standard Edison type screw sockets.
  • An example of a lamp base of the invention inserted in such a conventional socket is shown in FIG. 8.
  • the lamp base of the invention shown in FIG. 8 combines features of the bases illustrated in FIGS. 3 and 4 and is normally intended for use with a socket having a contact carrier member of the type shown in FIGS. 5 to 7.
  • the lamp base has a central contact pin 2 and a cylindrical outer contact band 19 closely similar to the band 5 seen in FIG. 3.
  • a substantially conical annular element 20 is integrally connected to the contact band '19 and flares therefrom outward so that its outer rim is close to a cylinder surface defined by theroots of the external threads on the lamp base.
  • the rim thus also is in a position of contact with the usual threaded sleeve of the Edison type socket when the pin 2 abuts against the central button contact 38 inthe socket.
  • the outline 21 of a light bulb equipped with a conventional Edison type screw base is indicated in chain dotted lines for comparison purposes.
  • FIG. 11 An additional lighting arrangement of the invention is illustrated in FIG. 11 in which a structure substantially similar to that of FIG. 10 is equipped with an outer shell of molded insulating material such as plastic replacing the outer metal shell of the embodiments described hereinbefore.
  • the contact carrier member 9 and the contact elements supported thereon are substantially identical with those shown in FIGS. 5 to 7 and 10.
  • the lamp mounted on the socket has a bulb 39 and a socket of the type shown in FIG. 1.
  • the plastic socket shell has a lower portion 34 threadedly engaging a substantially cylindrical upper portion 35.
  • the contact carrier member 9 is held within the shell between an integral internal annular collar 36 on the upper portion 35 and a shoulder on the lower shell portion 34.
  • a threaded metallic support member 18 is attached to the 'collar 36 by fasteners 37.
  • An electric lighting arrangement comprising, in combination:
  • socket means including (1) a contact carrier member having a top face;
  • lamp base means including 1 (l) a base member of insulating material
  • outer contact means further include an annular extension portion integral with said cylindrical sleeve member and flaring in a direction axially away from said sleeve member and from said annular groove.
  • said socket means further includes a projection on said top face, said projection being of substantially circular cross section coaxial with said threads and having an axially terminal face remote from said top face, said recess extending through said projection along the axis of said threads, and said base member being formed with a recess substantially conforming to said projection, said projection being received in the conforming recess in said operative position of the arrrangement, said second contact member being axially spaced from said terminal face in a direction toward said top face.
  • said socket means further includes outer shell means integral with said threaded support member and substantially enveloping said cont-act carrier member and said contact members.
  • said socket means further include outer shell means at least partly consisting of electrically insulating material, and substantially enveloping said contact carrier member and said contact members, said threaded support member essentially consisting of metallic material and being mounted on said shell means.
  • said support member is of tubular sheet metal formed with said internal threads and with corresponding axially coextensive external threads having the same pitch as said internal threads, said support member being formed with additional threads axially spaced from said internal threads and having said pitch.
  • said socket means further include outer shell means enveloping said contact carrier member and said contact members, said shell means including an upper portion and a lower portion threadedly engaged and threadedly movable relative to each other about said transverse axis, and locking means movable on one of said portions and engageable with said contact carrier member for selectively locking said one portion against rotary movement relative to said contact carrier member about said transverse axis.
  • said contact pin means has a free end portion axially spaced from said base member, and said outer contact means is axially spaced from said free end portion in a direction toward said base member.
  • said lamp base means includes insulating means interposed between said outer contact means and said threads of the support member in said operative position of said arrangement.

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US229690A 1961-10-12 1962-10-10 Electric lighting arrangement Expired - Lifetime US3248685A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV21453A DE1295079B (de) 1961-10-12 1961-10-12 Beruehrungsschutzanordnung fuer die Halterung elektrischer Gluehlampen mit Schraubensockel

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US3248685A true US3248685A (en) 1966-04-26

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US229690A Expired - Lifetime US3248685A (en) 1961-10-12 1962-10-10 Electric lighting arrangement

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DE (1) DE1295079B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5698935A (en) * 1994-04-25 1997-12-16 Leviton Manufacturing Co., Inc. Lampholder system with mogul base
US7025612B1 (en) 2005-03-18 2006-04-11 Lsi Industries, Inc. Base for a mogul-based lamp

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US287314A (en) * 1883-10-23 Charles g
US320030A (en) * 1885-06-16 Kd weston
US527989A (en) * 1894-10-23 hussey
US1861167A (en) * 1921-10-29 1932-05-31 Vello Leopoldo Sanchez Bulb, tube, or other hermetically closed receptacle for incandescent electric lamps and similar devices and process of manufacture of the same
US2004105A (en) * 1932-11-23 1935-06-11 Jr Robert E Farish Electrical connecter
US2056502A (en) * 1935-09-04 1936-10-06 Raleigh A Borell Lamp
US2078154A (en) * 1935-11-13 1937-04-20 Okino Shigeo Plug and cap connecter
US2160431A (en) * 1937-02-02 1939-05-30 Buser Johann Electric lamp connecting device
CH284610A (de) * 1950-09-16 1952-07-31 Pleisch Hans Schraubfassung für elektrische Lampen.
DE873291C (de) * 1940-11-26 1953-04-13 Vossloh Werke Gmbh Zwei- oder mehrteilige Isolierstoff-Fassung
DE898616C (de) * 1940-04-19 1953-12-03 Edmund Stehmann Gluehlampenfassung kurzer Baulaenge mit Schalenverschraubung und aus Isolierstoff bestehendem Mantel und Kappe
US2835878A (en) * 1953-10-05 1958-05-20 Bauer Heinz Push-in type lamp holder
DE1085256B (de) * 1956-06-27 1960-07-14 Gertrud Luise Schumacher Geb S Beruehrungsschutz-Anordnung fuer die Halterung elektrischer Gluehlampen mit Schraubsockel
US3091748A (en) * 1959-11-09 1963-05-28 Gen Dynamics Corp Electrical connector

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE367858C (de) * 1920-05-18 1923-01-27 Luis Hoellrigl Fassung fuer elektrische Gluehlampen
DE567469C (de) * 1927-08-03 1933-01-04 Caesar Rave Lampensockel fuer elektrische Gluehlampen
DE572621C (de) * 1928-08-31 1933-03-20 Caesar Rave Sockel mit aufgesetzter, den Aussenkontakt tragender Isolierhuelse fuer elektrische Gluehlampen
FR721968A (fr) * 1931-08-26 1932-03-10 Culot pour lampes électriques à deux filaments
AT143516B (de) * 1933-06-02 1935-11-11 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektrische Glühlampe.
CH168868A (de) * 1933-06-09 1934-04-30 B A G Bronzewarenfabrik A G Lampenfassung.

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US287314A (en) * 1883-10-23 Charles g
US320030A (en) * 1885-06-16 Kd weston
US527989A (en) * 1894-10-23 hussey
US1861167A (en) * 1921-10-29 1932-05-31 Vello Leopoldo Sanchez Bulb, tube, or other hermetically closed receptacle for incandescent electric lamps and similar devices and process of manufacture of the same
US2004105A (en) * 1932-11-23 1935-06-11 Jr Robert E Farish Electrical connecter
US2056502A (en) * 1935-09-04 1936-10-06 Raleigh A Borell Lamp
US2078154A (en) * 1935-11-13 1937-04-20 Okino Shigeo Plug and cap connecter
US2160431A (en) * 1937-02-02 1939-05-30 Buser Johann Electric lamp connecting device
DE898616C (de) * 1940-04-19 1953-12-03 Edmund Stehmann Gluehlampenfassung kurzer Baulaenge mit Schalenverschraubung und aus Isolierstoff bestehendem Mantel und Kappe
DE873291C (de) * 1940-11-26 1953-04-13 Vossloh Werke Gmbh Zwei- oder mehrteilige Isolierstoff-Fassung
CH284610A (de) * 1950-09-16 1952-07-31 Pleisch Hans Schraubfassung für elektrische Lampen.
US2835878A (en) * 1953-10-05 1958-05-20 Bauer Heinz Push-in type lamp holder
DE1085256B (de) * 1956-06-27 1960-07-14 Gertrud Luise Schumacher Geb S Beruehrungsschutz-Anordnung fuer die Halterung elektrischer Gluehlampen mit Schraubsockel
US3091748A (en) * 1959-11-09 1963-05-28 Gen Dynamics Corp Electrical connector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5698935A (en) * 1994-04-25 1997-12-16 Leviton Manufacturing Co., Inc. Lampholder system with mogul base
US7025612B1 (en) 2005-03-18 2006-04-11 Lsi Industries, Inc. Base for a mogul-based lamp

Also Published As

Publication number Publication date
DE1295079B (de) 1969-05-14

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