GB2306800A - Switched lamp holder - Google Patents
Switched lamp holder Download PDFInfo
- Publication number
- GB2306800A GB2306800A GB9522373A GB9522373A GB2306800A GB 2306800 A GB2306800 A GB 2306800A GB 9522373 A GB9522373 A GB 9522373A GB 9522373 A GB9522373 A GB 9522373A GB 2306800 A GB2306800 A GB 2306800A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp holder
- cover
- insert
- holes
- switched
- 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.)
- Granted
Links
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
- 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
- H01R33/945—Holders with built-in electrical component
- H01R33/955—Holders with built-in electrical component with switch operated manually and independent of engagement or disengagement of coupling
Landscapes
- Push-Button Switches (AREA)
Abstract
An easy-assembly lamp holder has an insulating insert (2) housing the contacts and a protective, possibly decorative brass cover (1). A push bar actuator (14) extends through the insert and out of the holes in the housing. The matching holes in the housing and insert are designed so that the push-bar can be inserted after the insert has been placed inside the cover. The push bar actuator operates the input and output contacts (4) in the insulating housing.
Description
SWITCHED LAMP HOLDER
The present invention relates to switched lamp holders and is particularly suitable for switched lamp holders of the type used in table lamps. The invention has been designed to overcome certain problems with currently available brass lamp holders.
Brass lamp holders for table lamps typically include an insulating insert housing the electrical contacts enclosed in a brass outer cover. The insulating insert is usually in two parts, the first of which includes the lamp contacts and the second of which includes the wire contacts.
The two parts of the insert are held together and the respective contacts are accessible from opposite ends of the assembled insert. The switch is usually actuated by means of a switch actuator protruding from the insert and movable transversely in the insert to make or break an electrical connection between the contacts. For cosmetic reasons, it is desirable for the brass cover to enclose the insulating insert leaving only the switch actuator protruding. Because of the protrusion of the switch actuator, the brass cover is usually made in two-parts which have to be screwed together and is consequently expensive to manufacture and is a potentially weak part of the lamp holder. The whole lamp holder requires a relatively large number of steps for its assembly.
The present invention provides a switched lamp holder assembly kit comprising an insulating insert housing input and output contacts, a cover and a separate switch actuator; wherein the insert and cover have corresponding holes for receiving the switch actuator, and the switch actuator and holes are dimensioned such that the switch actuator can be inserted in the holes after the insert has been placed in the cover.
The switch actuator is preferably in the form of a bar having no lateral protrusions. The holes may be rectangular in section. The holes may extend through the completed lamp holder whereby opposite ends of the switch actuator may protrude from the lamp holder depending on its position. Thus, the cover need only have a hole facing the hole in the insert to enable the actuator to be inserted last. The cover may be in the form of a one-piece sheath or sleeve which slides over the insert.
The hole or holes in the cover may be slightly smaller than the cross-section of the hole in the insert.
The cover may then define a shoulder with respect to the insert which may assist in retaining the switch actuator within the lamp holder.
The insert and cover may be cylindrical and the cover may have a partially threaded surface for receiving one or more tapped rings, for example shade rings.
Preferably, the threads at least partially overlap one or both holes in the cover whereby a tapped ring screwed onto the cover may also assist in retaining the switch actuator in place.
The insert is preferably in two parts, the first including the lamp contacts and the second including the wire contacts. The wire contacts may be in the form of pushwire terminals for easy assembly. If the cover is made from a conductive material such as brass the incoming earth wire may be connected to earth via contact with the cover.
The insert preferably encloses at least one, usually two, conductive bridge members movable transversely in the insert to and from a position bridging the input and output contacts. In the usual way, the switch actuator may be provided with a camming surface and the bridge members may be joined by an insulating member which forms a cam follower, the camming action effecting the movement of the bridge members.
An embodiment of the invention will now be described by way of example only and with reference to the accompanying drawings in which:
FIGURE 1 is a partial cross-sectional view through a position of the switch contacts with the switch closed and a lamp (not shown) inserted;
FIGURE 2 is a cross-sectional view of the outer casing, taken perpendicular to the section of Figure 1;
FIGURES 3(a) and 3(b) are respectively a side elevation and top plan view of the push-bar switch actuator;
FIGURE 4 is a bottom plan view of a first housing part for the lamp contacts;
FIGURE 5 is a side elevation of the first housing part for the lamp contacts, viewed in direction A shown in
Figure 4;
FIGURE 6 is a side elevation of the first housing part for the lamp contacts viewed in direction B shown in
Figure 4;
FIGURE 7 is a side elevation of a second housing part for the wire terminals;;
FIGURES 8 and 9 are respectively bottom and top plan views of the housing part of Figure 7;
FIGURE 10 is a part cross-sectional view of the housing part of Figures 8 and 9 taken along the line X-X in
Figure 9;
FIGURE 11 is a cross-sectional view of the housing part for the wire terminals taken along the line Y-Y in
Figure 9; and
FIGURE 12 is a side elevation showing the two housing parts assembled.
The drawings illustrate a lamp holder designed to accommodate a light bulb or lamp using the well known "bayonet" mechanism. The lamp holder includes a generally cylindrical brass cover 1 in which are located first and second insulating insert members 2 and 3. Insert member 2 accommodates two standard plunger-type contacts for the lamp, one of which is visible in Figure 1 and indicated by reference numeral 4. One end of the cylindrical cover 1 is open and its circular edge is provided with a pair of "J" slots 5,6 for receiving corresponding protrusions on the lamp.
The opposite end of the cylindrical cover 1 is tapered to provide a narrower opening 7 into which wires for the lamp holder are fed. The insert part 3 accommodates three terminals for the wires, two of which are visible in
Figure 1, namely the earth terminal 8 which contacts the brass cover 1 to form an earth connection and the live terminal 9. The neutral terminal 10 is visible in Figure 9.
All three terminals are in the form of well-known push-wire terminals. The terminals include springs, one of which is indicated at 8a in Figure 1. To make electrical connections with the terminals, the wires are simply stripped and pushed into the terminals so that they are gripped by the springs and cannot be readily pulled out of the terminals. These terminals are much more convenient than the commonly used screw-type connections which require more skill and labour to assemble.
Contact between each plunger 4 and its corresponding push-wire terminal 9 is made by a conductive bridging member 12 one of which is provided for each plunger. As is usual in the construction of lamp holders of this type, the bridging members are joined by an insulating bar 13 and the electrical connection is switched on or off by means of a manually operable switch actuator in the form of a push-bar 14. The push-bar 14 has a camming surface 15 and the insulating bar 13 acts as a cam follower whereby pushing the push-bar 14 in the direction of arrows Z causes the bridging members to pivot to the left or right with respect to their corresponding plungers. Springs, one of which is indicated at 16, bias the plungers outwardly.
Referring now to Figures 4,5 and 6, the insulating insert member 2 is a generally cylindrical member having a a circular base portion 20 from which four legs 21,22,23,24 extend. As shown most clearly in Figure 4, the crosssectional shape of the legs is such as to define two rectangular channels 27,28, extending in perpendicular directions transversely of the cylinder axis. The base of channel 27 is provided with two circular holes 29,30 which channel 27 is provided with two circular holes 29,30 which retain the lamp plunger contacts in the usual way. The base 20 includes an annular flange 31 extending outwardly around its edge except in the region of the transverse slot 28.
The function of this flange will be described below.
Referring to Figures 7 to 11, the insert portion 3 is a generally cylindrical member having a substantially solid portion 40 housing the push-wire terminals and a depending cylindrical skirt 41. The skirt 41 is provided with opposing rectangular channels 43,44, and has an inwardly facing flange 42 at its edge.
Viewed from above, the solid portion 40 includes channels 45,46, extending parallel to the direction of travel of the push-bar 14, for accommodating the bridging members 12. The bridging members move along their respective channels 45,46 to make or break contact with live and neutral terminals 9,10. Circular openings 48,49 provide access to terminals 9,10. A transverse slot 50 extending across part of portion 40 accommodates the earth terminal 8 enabling it to contact the cover 1.
The push-bar switch actuator is illustrated in
Figures 3(a) and 3(b). It will be noted that it is in the form of a straight bar having two flat parallel surfaces 52,53 and no lateral protrusions from its direction of travel. Of the other two surfaces of the push-bar 14, one includes a V-shaped camming surface 15. The opposite surface of the push-bar 14 is flat with a protruding portion 57 defining shoulders 58,59 which limit the movement of the push bar.
The lamp holder according to the invention is assembled as follows: The push-wire terminals are installed in the insert member 3, the plungers are inserted in the insert member 2 and the assembly of bridge members 12 and insulating bar 13 is inserted in the insert member 2 such that the bridge members contact the plungers and the bar 13 extends across the channel 27. The insert member 3 is then offered up to the insert member 2 with the skirt 41 facing the ends of the legs 21-24 and the recesses 43,44 aligned with the ends of the channel 28. The insert members 2 and 3 are then pushed together and form a snap-fit by virtue of the respective flanges 31 and 42. It will be seen from
Figure 12 that the assembled insert members form between them a relatively deep rectangular hole indicated by reference numeral 60 in Figure 12 into which the push-bar 14 may be inserted.At this stage, or earlier, a cable may be connected to the push-wire terminals of the insert part 3.
The cylindrical brass cover is next positioned over the assembled insert parts 2 and 3. The cover is provided with holes 61 and 62 which may be aligned with the hole 60 defined in the insert parts 2 and 3. At this point, the cover 1 is movable with respect to the assembled insert parts. The holes in the cover 1 are slightly smaller than the cross-section of the hole 60.
In the absence of a lamp pushing the plungers inwards, the push-bar 14 may be readily inserted into the rectangular hole, via the holes in the cover 1, between insert member 3 and insulating bar 13. Once inserted, the combined action of the springs which bias the plungers outwardly and shoulders 55 and 56 defining the ends of the camming surface 15, prevent the push-bar 14 from being subsequently removed.
The cover 1 has a partially threaded outer surface indicated at 70 in Figure 2 which partially overlaps the holes 61 and 62. The threaded surface is designed to receive rings 71 and 72 for holding a lamp shade in place.
It will be seen from Figure 1 that once in place, the first ring 71 covers most of the apertures 61 and 62 in the cover 1 so as to further improve the appearance of the assembled lamp holder.
The fact that the cover 1 is in one part gives numerous advantages. Firstly, it is simpler to construct.
There are no problems associated with the strength of the union of two cover halves and the use of fewer components means that the assembly of the lamp holder is simpler.
The use of push-wire terminals is preferable from a manufacturing point of view as the end user cannot tamper with a finished assembly. The terminals are non-serviceable and there is no chance of the wires coming loose. Push-wire terminals also have the advantage of quicker construction, which results in less labour requirement making them cheaper to manufacture.
Claims (11)
1. A switched lamp holder assembly kit comprising an insulating insert housing input and output contacts, a cover and a separate switch actuator; wherein the insert and cover have corresponding holes for receiving the switch actuator and the switch actuator and holes are dimensioned such that the switch actuator can be inserted in the holes after the insert has been placed in the cover.
2. A switched lamp holder as claimed in claim 1 in which the switch actuator is in the form of a bar having no lateral protrusions.
3. A switched lamp holder as claimed in claim 1 or 2 in which the holes are rectangular in section.
4. A switched lamp holder as claimed in claim 1, 2 or 3 in which the holes extend through the completed lamp holder whereby opposite ends of the switch actuator may protrude from the lamp holder depending on its position.
5. A switched lamp holder as claimed in any preceding claim in which the cover has a hole facing the hole in the insert.
6. A switched lamp holder as claimed in any preceding claim in which the cover is in the form of a one-piece sleeve which slides over the insert.
7. A switched lamp holder as claimed in any preceding claim in which the hole or holes in the cover are slightly smaller than the cross-section of the hole in the insert.
8. A switched lamp holder as claimed in any preceding claim wherein the cover has a partially threaded surface for receiving one or more tapped rings.
9. A switched lamp holder as claimed in claim 8 in which the threads at least partially overlap the hole or holes in the cover.
10. A switched lamp holder as claimed in any preceding claim in which the cover is made from a conductive material.
11. A switched lamp holder substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9522373A GB2306800B (en) | 1995-11-01 | 1995-11-01 | Switched lamp holder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9522373A GB2306800B (en) | 1995-11-01 | 1995-11-01 | Switched lamp holder |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9522373D0 GB9522373D0 (en) | 1996-01-03 |
GB2306800A true GB2306800A (en) | 1997-05-07 |
GB2306800B GB2306800B (en) | 1999-09-22 |
Family
ID=10783231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9522373A Expired - Fee Related GB2306800B (en) | 1995-11-01 | 1995-11-01 | Switched lamp holder |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2306800B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000046886A1 (en) * | 1999-02-05 | 2000-08-10 | Golden Peakock Overseas Limited | A screwless pushbar lampholder |
CN101527416A (en) * | 2008-12-19 | 2009-09-09 | 东莞大朗金准电器厂 | GU24 pushing-handle switch lamp base |
CN102270803A (en) * | 2010-06-01 | 2011-12-07 | 林润标 | Lamp holder for plug-in connection with power cord |
CN102270804A (en) * | 2010-06-01 | 2011-12-07 | 林润标 | Patchcord screw socket with push handle switch |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB335627A (en) * | 1929-08-21 | 1930-10-02 | Albert Mugeli | Improvements in or relating to switch lamp holders for incandescent electric lamps |
GB684219A (en) * | 1951-05-26 | 1952-12-10 | Tucker J H & Co Ltd | Improvements relating to electric lamp holders incorporating switches of the push bar type |
-
1995
- 1995-11-01 GB GB9522373A patent/GB2306800B/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB335627A (en) * | 1929-08-21 | 1930-10-02 | Albert Mugeli | Improvements in or relating to switch lamp holders for incandescent electric lamps |
GB684219A (en) * | 1951-05-26 | 1952-12-10 | Tucker J H & Co Ltd | Improvements relating to electric lamp holders incorporating switches of the push bar type |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000046886A1 (en) * | 1999-02-05 | 2000-08-10 | Golden Peakock Overseas Limited | A screwless pushbar lampholder |
CN101527416A (en) * | 2008-12-19 | 2009-09-09 | 东莞大朗金准电器厂 | GU24 pushing-handle switch lamp base |
CN102270803A (en) * | 2010-06-01 | 2011-12-07 | 林润标 | Lamp holder for plug-in connection with power cord |
CN102270804A (en) * | 2010-06-01 | 2011-12-07 | 林润标 | Patchcord screw socket with push handle switch |
Also Published As
Publication number | Publication date |
---|---|
GB9522373D0 (en) | 1996-01-03 |
GB2306800B (en) | 1999-09-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3289149A (en) | Multiple contact jack assembly | |
US5306870A (en) | Screened cable branch connection device | |
US5008588A (en) | Wedge-type lamp bulb assembly | |
JP3688338B2 (en) | Electrical connection and coupling terminal | |
US4830631A (en) | Fuse holder for connecting a flat-type fuse block between a pair of wires | |
CA2095939C (en) | Safety construction of receptacle plugs | |
US2915621A (en) | Flashlight | |
EP0029836B1 (en) | Electrical interconnectors | |
GB2301953A (en) | Electrical connectors | |
US5924884A (en) | Lamp socket | |
KR20010013364A (en) | Fuseholder and connector | |
US5030124A (en) | Bulb socket | |
EP0822626B1 (en) | Lamp socket | |
EP0250215A2 (en) | Festoon lighting | |
GB2271472A (en) | Filtered electrical plug. | |
GB2306800A (en) | Switched lamp holder | |
EP0709936B1 (en) | Lamp socket | |
US4529258A (en) | Electric lamp socket assembly having stripless wiring terminals | |
JPS61158679A (en) | Multipolar plug | |
US2531625A (en) | Safety electrical outlet | |
JPH1083857A (en) | Connector unit for transmission network | |
US4437725A (en) | Junction connections for modular wiring systems | |
US5176536A (en) | Right angle phone plug | |
ATE167962T1 (en) | LAMP HOLDER, ESPECIALLY FOR HALOGEN BULBS | |
JPH0415971B2 (en) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20061101 |