EP0933839A2 - Safety bulb holder - Google Patents
Safety bulb holder Download PDFInfo
- Publication number
- EP0933839A2 EP0933839A2 EP99300125A EP99300125A EP0933839A2 EP 0933839 A2 EP0933839 A2 EP 0933839A2 EP 99300125 A EP99300125 A EP 99300125A EP 99300125 A EP99300125 A EP 99300125A EP 0933839 A2 EP0933839 A2 EP 0933839A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- bulb
- pins
- bayonet
- socket
- bulb holder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/44—Means for preventing access to live contacts
- H01R13/447—Shutter or cover plate
- H01R13/453—Shutter or cover plate opened by engagement of counterpart
- H01R13/4532—Rotating shutter
-
- 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
- H01R33/46—Two-pole devices for bayonet type base
Landscapes
- Fastening Of Light Sources Or Lamp Holders (AREA)
Abstract
Description
- This invention relates to safety bayonet-fitting light bulb holders.
- Bayonet-fitting bulb holders are about as old as electric lighting itself and have not fundamentally changed since their introduction. They consist of a socket with bayonet pin receiving slots and a body holding sprung contact pins. These pins, with no bulb present, although within the socket, are nevertheless exposed and can be live without any means of telling, even with switched bulb holders.
- Numerous designs have been proposed to render such bulb holders safe, including, with switched bulb holders, a mechanism that precludes removing the bulb while the pins are live and precludes switching the pins to live unless there is a bulb present. It has also been proposed to disconnect the pins from contact with live terminals when no bulb is present. These arrangements do not appear to have been put on the market to any great extend, quite possibly because the safety measures necessarily render them more expensive than conventional bulb holders without any outward sign that they are any safer - the contact pins are still visible and accessible, and, where safe holders are mixed with conventional in a household or office, a false sense of security may be engendered.
- Designs have also been proposed in which a cover plate, is movable axially and in rotation which has apertures for the contact pins, the pins projecting through the apertures so as to be accessible to the bulb contacts when the bulb is inserted, but rotating so that the cover plate conceals the pins when the bulb is removed. Even so, this design is not totally safe, since it is possible to displace the cover plate in the absence of a bulb to expose live contact pins.
- The present invention provides an improved bayonet-fitting bulb holder which does not have the problems of the aforementioned prior art.
- The invention comprises a bayonet-fitting bulb holder having a socket and a cover plate therein for the contact pins which has apertures for the pins and which is moved by the action of inserting a bulb so as to align the apertures with the pins and by the action of removing a bulb so as to cover the pins and comprising a locking arrangement preventing movement of the cover plate from the pin-covering position except by inserting a bulb or like member filling the socket.
- The cover plate may move axially and rotate in the socket between the pin aligning and covering positions. Rotational movement may be permitted by the locking arrangement by a member urged radially outwardly on insertion of a bulb. The cover plate may be the base of a cup member having a cylindrical wall and being journalled on a sub-plate which sub-plate is free to move axially but not to rotate in the socket and which has a notch into which fits an inwardly-biassed tongue of the cup member which is urged out of the notch on insertion of a bulb. The tongue may be continuation of the cylindrical wall of the cup member, rooted therein and projecting below the base to the depth of the sub-plate.
- The cup member and the sub-plate may form a unit having a depending spigot axially slidable in a bore of a contact pin sub-assembly.
- The cylindrical wall of the cup member may be relieved to accept the bayonet pins of a bulb to effect rotation of the cover plate as the bulb is rotated in the socket on insertion and removal.
- The bulb holder may have bayonet pin engagement slots extending through a quarter turn, and, indeed, this feature may be used independently of the safety feature, the subject ofthe above-disclosed invention. An advantage ofthe quarter turn-extending bayonet slot is that it affords a shallow ramp which requires less insertion force and less liability to damage of the bayonet slots which can give rise to difficulties inserting and removing bulbs.
- It is recognised that bulb holders are sometimes used as sockets for plugs which mimic the contact base of a bayonet fitting bulb - the holders of the present invention work with such plugs exactly, of course, as with bulbs themselves.
- Embodiments of bayonet-fitting lamp bulb holders according to the invention will now be described with reference to the accompanying drawings, in which:-
- Figure 1
- is an axial section through a bulb holder with the bayonet track developed, with a bulb mounted;
- Figure 2
- is a section like Figure 1, with no bulb mounted;
- Figure 3
- is a perspective view of a cover plate assembly of the bulb holder of Figures 1 and 2, from above;
- Figure 4
- is a perspective view of the assembly of Figure 3, from below;
- Figure 5
- is a view on
arrow 5 of Figure 1; - Figure 6
- is a view on arrow 6 of Figure 2; and
- Figure 7
- is a section through 7-7 of Figure 3.
- The drawings illustrate a bayonet-
fitting bulb holder 11 having asocket 13 and acover plate 12 therein for thecontact pins 16 which haveapertures 15 for thepins 16 and which is moved by the action of inserting abulb 14 so as to align theapertures 15 with thepins 16 and by the action of removing thebulb 14 so as to cover thepins 16, and comprising alocking arrangement 20 preventing movement of thecover plate 12 from the pin-covering position (Figures 2, 6) except by inserting abulb 14 or like member such as a bulb-mimicking plug filling the socket. - The
cover plate 12 moves axially and rotates in the socket between the pin-aligning (Figures 1, 5) and pin-covering (Figures, 2 6) positions. - Rotational movement is permitted by the
locking arrangement 20 by amember 22 urged radially outwardly (arrow A, Figure 7) on insertion of abulb 14. Thecover plate 12 is the base of a cup member 23 - see particularly Figures 3 and 4 having acylindrical wall 24 and being journalled on asub-plate 25, whichsub-plate 25 is free to move axially but not to rotate (by virtue oflugs 25a) in thesocket 11 and which has a notch 26 - in fact, two diametrally opposite notches 26 - into which fits an inwardly-biassed tongue - themember 22 is thecup member 23 which urged out of thenotch 26 on insertion of abulb 14. There can be more than twosuch tongues 22 and notches 26 - the more there are, the more effective thelocking arrangement 20. - The
tongue 22 is a continuation of thecylindrical wall 24 of thecup member 23, rooted therein at 22a as a sprung hinge and projecting below the base - the cover plate 12 - to the depth of thesub-plate 25. Thecup member 23 and thesub-plate 25 for a unit - see particularly Figures 3 and 4 - having a dependingspigot 21 axially slidable in abore 28 of acontact pin sub-assembly 11a of thebulb holder 11. In manufacture, thecover plate 12,sub-plate 25 unit is assembled, then dropped into thesub-assembly 11a where it is retained against removal (which would defeat the object) by a radially-inwardly directedstep 19 on thesocket 13. - In the pin-covering position, Figures 2, 6, the
pins 16, which are, of course, spring-biassed, urge theunit step 19. In the pin-aligned position, Figures 1, 5 thepins 16 project just through (by about 1 mm) theapertures 15 in contact with theterminals 17 of thebulb 14. - The
cylindrical wall 24 of thecup member 23 is relieved at 24a to accept the bayonet pins 14a of abulb 14 to effect rotation of the cover plate as thebulb 14 is rotated in thesocket 14 on insertion and removal. The relieving at 24a is designed to operate with an improved bayonet action in which the bayonetpin engaging tracks 18 of thesocket 13 are ramped and extend through a quarter turn, as is seen in the developed profile in Figures 1 and 2. This ramped track facilitates easier insertion and removal of the bulb with reduced risk of damage to an consequent malfunction of the track as compared with a conventional "J" shaped track extending over a fraction of that and requiring a substantially axial insertion with a short twist before the sprung contact pins push the bulb back. - The ramped track can be used even without the cover plate arrangement. However, when used with it, the angular extent of the relieving at 24a is equal to that of the
track 18 less required rotation of thecover plate 12 to give access to thepins 16. - Removing the
bulb 14, because ofthe profiling ofthe relieving at 24a, holds thecover plate 15 down at the level seen in Figure 1 allowing thesprung pins 16 to assist in the ejection of thebulb 14 exactly as in a conventional arrangement. Only when the bayonet pins pick up the vertical section V of the relieving 24a - position 1 on thedeveloped track 18, Figure 2 - does thecover plate 12 begin to close. Theplate 12 hasreliefs 15a on the bulb side of theapertures 15 to ease its passage between thepins 16 and thebulb 14.
Claims (11)
- A bayonet-fitting bulb holder having a socket and a cover plate therein for the contact pins which has apertures for the pins and which is moved by the action of inserting a bulb so as to align the apertures with the pins and by the action of removing a bulb so as to cover the pins and comprising a locking arrangement preventing movement of the cover plate from the pin-covering position except by inserting a bulb or like member filling the socket.
- A bulb holder according to claim 1, in which the cover plate moves axially and rotates in the socket between its pin aligning and covering positions.
- A bulb holder according to claim 2, in which rotational movement is permitted by the locking arrangement by a member urged radially outwardly on insertion of a bulb.
- A bulb holder according to claim 3, in which the cover plate is the base of a cup member having a cylindrical wall and being journalled on a sub-plate which sub-plate is free to move axially but not to rotate in the socket and which has a notch into which fits an inwardly-biassed tongue ofthe cup member which is urged out ofthe notch on insertion of a bulb.
- A bulb holder according to claim 4, in which the tongue is a continuation of the cylindrical wall of the cup member, rooted therein and projecting below the base to the depth of the sub-plate.
- A bulb holder according to claim 4 or claim 5, in which the cup member and the sub-plate form a unit having a depending spigot axially slidable in a bore of a contact pin sub-assembly.
- A bulb holder according to any one of claims 4 to 6, in which the cylindrical wall of the cup member is relieved to accept the bayonet pins of a bulb to effect rotation of the cover plate as the bulb is rotated in the socket on insertion and removal.
- A bayonet-fitting bulb holder having ramped bayonet pin engagement tracks.
- A bulb holder according to claim 8, in which the tracks extend through a quarter turn.
- A bulb holder according to any one of claims 1 to 7, having bayonet pin engagement tracks according to claim 8 or claim 9.
- A bayonet-fitting arrangement comprising a socket having bayonet pin engagement slots extending through a quarter turn.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9801682.7A GB9801682D0 (en) | 1998-01-28 | 1998-01-28 | Safety bulb holder |
GB9801682 | 1998-01-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0933839A2 true EP0933839A2 (en) | 1999-08-04 |
EP0933839A3 EP0933839A3 (en) | 2000-05-17 |
Family
ID=10825950
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99300125A Withdrawn EP0933839A3 (en) | 1998-01-28 | 1999-01-07 | Safety bulb holder |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0933839A3 (en) |
GB (1) | GB9801682D0 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003043141A1 (en) * | 2001-11-14 | 2003-05-22 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung | Illuminating apparatus comprising a device for protection against electric discharges and method for protection against electric discharges in lighted lamps |
WO2012075357A2 (en) | 2010-12-03 | 2012-06-07 | Ideal Industries, Inc. | Device for holding a source of light |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2337954A1 (en) * | 1976-01-06 | 1977-08-05 | Bonnet Robert | Safety socket for bayonet connected lamp - has insert rotating with lamp uncovering live contacts |
WO1987004867A1 (en) * | 1986-02-06 | 1987-08-13 | Kudos Lighting Limited | Lampholder |
-
1998
- 1998-01-28 GB GBGB9801682.7A patent/GB9801682D0/en not_active Ceased
-
1999
- 1999-01-07 EP EP99300125A patent/EP0933839A3/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2337954A1 (en) * | 1976-01-06 | 1977-08-05 | Bonnet Robert | Safety socket for bayonet connected lamp - has insert rotating with lamp uncovering live contacts |
WO1987004867A1 (en) * | 1986-02-06 | 1987-08-13 | Kudos Lighting Limited | Lampholder |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003043141A1 (en) * | 2001-11-14 | 2003-05-22 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung | Illuminating apparatus comprising a device for protection against electric discharges and method for protection against electric discharges in lighted lamps |
WO2012075357A2 (en) | 2010-12-03 | 2012-06-07 | Ideal Industries, Inc. | Device for holding a source of light |
EP2646749A2 (en) * | 2010-12-03 | 2013-10-09 | Ideal Industries Inc. | Device for holding a source of light |
EP2646749A4 (en) * | 2010-12-03 | 2014-07-23 | Ideal Ind | Device for holding a source of light |
US9739457B2 (en) | 2010-12-03 | 2017-08-22 | Ideal Industries, Inc. | Device for holding a source of light |
Also Published As
Publication number | Publication date |
---|---|
EP0933839A3 (en) | 2000-05-17 |
GB9801682D0 (en) | 1998-03-25 |
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