GB2566749A - An electrical connector for mains power supply - Google Patents
An electrical connector for mains power supply Download PDFInfo
- Publication number
- GB2566749A GB2566749A GB1715574.8A GB201715574A GB2566749A GB 2566749 A GB2566749 A GB 2566749A GB 201715574 A GB201715574 A GB 201715574A GB 2566749 A GB2566749 A GB 2566749A
- Authority
- GB
- United Kingdom
- Prior art keywords
- connector
- actuator
- terminal
- live
- spur
- 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- Withdrawn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
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
- H01R13/66—Structural association with built-in electrical component
- H01R13/68—Structural association with built-in electrical component with built-in fuse
-
- 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
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/703—Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part
-
- 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
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2103/00—Two poles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
- H01R24/28—Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable
- H01R24/30—Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable with additional earth or shield contacts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Landscapes
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
A mains electrical connector (10, figures 2A, 2B) with a hollow housing including: a power supply port 12 on a front face (4); a socket power port 14 on a rear face (2) capable of receiving another similar connector; and an appliance power port 16, wherein the power supply port includes a live pin 13L and a neutral pin 13N electrically communicating with live and neutral lines through the connector to corresponding live 14L 16L and neutral terminals 14N 16N of the appliance power port and socket power port; and an overcurrent protection assembly 24 having an upstream terminal 26.1 electrically communicating with the live pin and a downstream terminal 26.3; and a switch 28 biased to electrically connect the downstream terminal to the live socket power port terminal and, when the connector is plugged into the socket power port of another similar connector, disconnect the live socket power terminal from the downstream terminal and connect it to the upstream terminal whereby the conductor fails safe. The switch may include an actuator (201) or proximity sensor responsive to the proximity of the similar connector.
Description
AN ELECTRICAL CONNECTOR FOR MAINS POWER SUPPLY
FIELD OF THE INVENTION toon This invention relates to overcurrent protected electrical connectors suitable for single phase ac mains power supply, and in particular to electrical connectors comprising two or more pins adapted to be plugged into a socket
BACKGROUND [002] Many electrical and household appliances are powered directly by the mains electricity, e.g. TV’s, radios, computers, printers, and many others. Normally, in the
UK, this power is obtained by a connection made via a 13A three pin plug which is inserted into a corresponding wall socket electrically communicating with the mains electrical supply. With the increasing number of such appliances, particularly in and around the home, office or kitchen, the need for extra mains sockets has increased tremendously. The costs associated with such wall sockets are very high and most people prefer instead to use one or more multi-outlet (multi-socket) extension cable connectors and to plug their appliances into sockets thereof, so that each appliance is connected through such a socket via the common cable of the extension cable connector to a common mains plug which is then plugged into the wall socket. Such a connector can be awkward, be hazardous and or use up too much space.
[003] A solution to this problem in the form of an extender plug was proposed in published
British patent application GB2457217. The extender plug of GB2457217 is shown in prior art Figures 1A-1F in which:
figure 1A is an isometric SW view of an extender plug;
figure 1B is an isometric NW view of the first embodiment;
figure 1C is a left elevation of a single extender plug and cable plugged into a wall socket;
figure 1D is a left elevation of a first extender plug plugged into a wall socket W and a second extender plug plugged into the first extender plug;
figure 1E is a left sectional elevation of the view of figure 1D;
figure 1F is a circuit diagram of the extender plugs shown in figures 1D and 1E;
figure 1G is a flow chart showing the switch process implemented by the extender plug.
[004] The prior art connector 10 illustrated in figures 1A-1F, comprises hollow electrically insulating housing 22 with a base part 6 and a top part 8. A front face 4 on the base and rear face 2 on the top part 8 are generally flat. The front face 4 is provided with a plug power port 12 having three pins 13. A socket power port 14 comprising socket holes 15 is provided on the rear face. An appliance power port 16 receiving an appliance cable 17 connected to a power-consuming appliance (not shown) is disposed in a side wall of the connector to connect each of a live appliance power port terminal 16L, a neutral socket power terminal 16N and an earth socket power terminal
16E. The disposition of the plug port 12 and socket power port 14 on opposite front and rear faces facilitates stacked connection of two or more like connectors 10’ as seen in Figure 1D. The circuit includes a manually operable isolation switch 16.1 to isolate the live appliance power port terminal 16L from the live power port terminal
13L.
loos] The three pins 13 provide connectivity with respectively a live line “L”, a neutral line “N” and an earth Έ”. These lines are electrically isolated and continued through the connector 10. Socket port 14 includes sockets corresponding to the pins of a similar or any compatible three pin plug namely 14L Live, 14N Neutral and 14E earth to provide connection to each one of a live socket power terminal 14L, a neutral socket power terminal 14N and an earth socket power terminal 14E [oo6] The connector 10 provides an overcurrent circuit protection assembly 24 within the housing and in the live line. The overcurrent circuit protection assembly 24 includes an overcurrent circuit protection device 26 and a switch 28. The overcurrent circuit protection device 26 may be a fuse or any form of resettable circuit breaker such as an
RCD. One terminal 26.1 off the overcurrent circuit protection assembly is in electrical communication with the live pin 13L. A second downstream terminal 26.2 is in electrical communication with a live line of the appliance power port 16. A third downstream terminal 26.3 of the circuit protection device 26 is in electrical communication with the switch 28. The switch 28 is a single pole double throw switch
28. The switch 28 can electrically communicate the live socket power port terminal with one of the upstream terminal 26.3 or the downstream terminal 26.1. The switch is biased to normally communicate with the downstream terminal 26.1 in a rest mode.
[007] A proximity means in the form of a linearly displaceable projection 42 is formed on the front face 6 of the connector body. The projection 42 is linearly slidable in a sleeve
42.1 formed in the housing and is biased to a projecting condition by means of a spring 42.3. The projection 42 is arranged to actuate the switch 28 driving it from its normal rest mode communicating with the downstream terminal 26.1 to an extender plug mode communicating with the upstream terminal 26.3 as shown at 28’.
toes] Where a connector 10’ is plugged into a conventional socket the projection 42 is forced into the sleeve 42.1 actuating the switch 28 as described. However, where the connector 10’ is plugged into a power port 14 of another similar connector 10 the projection 28 is received into a recess 54 formed in the rear face 2. In consequence the projection is not pressed into the housing of the connector and the switch 28 remains in the rest position shown at 28’.
[009] Figure 1G illustrates the process implemented by the prior art connector. At step 1.2 the overcurrent circuit protection is in circuit with the appliance power port live terminal
16L and out of circuit with the socket power port live terminal 14L.
[oio] At step 1.3 the connector detects if it is plugged into a conventional socket W. If it is, the process goes to step 1.4 where the switch 28 is actuated to switch the live power port terminal 13L into circuit with the live socket port terminal 14L.
ton] If the connector is not connected to a conventional socket step 1.6 detects if the connector is connected to a similarly adapted extender plug connector. If it is the plug implements process step 1.7 by actuating the switch 28 to disconnect or leave disconnected the overcurrent protection device 26.
STATEMENT OF INVENTION ton] An electrical connector for mains comprising:
a housing having;
a plug power port comprising two or more conductive pins adapted to be received into a corresponding mains supply socket, at least one pin providing electrical communication with a live line through the connector and at least one pin providing electrical communication with a neutral line through the connector;
an appliance power port adapted to receive an appliance cable to place an appliance in electrical communication with the plug power port;
a socket power port providing a socket to receive the pins of a compatible plug;
an overcurrent circuit protection assembly having an upstream terminal electrically communicating with the live pin of the plug power port and a downstream terminal;
a switch arranged to communicate a live line of the socket power port with, at any single time, one only of the downstream terminal or the upstream terminal;
characterised in that:
in a rest condition, the switch connects the upstream terminal to the live line of the socket power port; and in that:
the switch responds to insertion of its plug power port in a socket power port of another similar connector to switch to an extender plug where the downstream terminal is connected to the live line of the socket power port.
/073; When the connector is not plugged into anything, the switch connects the downstream terminal to the live line of its socket power port so that the overcurrent circuit protection device is operative. If the connector is plugged into a conventional mains socket the switch continues to connect the downstream terminal to the live line of its socket power port. When the connector is plugged into any other similar extender plug connector the switch connects the upstream terminal to the live line of the socket power port. By connecting the upstream terminal to the live line of the socket power port the overcurrent circuit protection assembly is by-passed or out of circuit with the live pin of the plug power port and the live line of the socket power port.
[oi4i Preferably the operation of the switch is achieved by a proximity sensor arrangement.
The proximity sensor arrangement may advantageously be implemented by an actuator and a spur. The actuator may be housed in an aperture formed in a front face of the housing. The actuator is preferably resiliently biased to a projecting position within the aperture. The projecting position will correspond to the rest position.
Preferably the aperture is arranged to receive a spur projecting from the rear face of a similar connector when the connector is an extension connector plugged into another similar primary connector. The spur may be retractable into a recess formed in the rear face. Preferably the spur is biased to extend from the recess and retracts against the bias when received into the aperture and engaged with the actuator. The bias force of the spur is sufficient to overcome the bias force of the actuator.
[oi5] Alternative proximity sensor arrangements may be used to detect when the connector is plugged into another similar connector. These may include an arrangement of a magnetic actuator disposed near the front face of the housing to be responsive to the presence of a magnet or magnetic material “spur” component in the rear face of the housing of a similar connector. The magnetic actuator will be displaced by attraction or repulsion when in the proximity of the magnetic spur in order to actuate the switch.
This may simplify the structure, reduce the number of components and reduce the assembly steps for the connector.
[oi6] Further alternative proximity sensor arrangements are contemplated including and actuator provided by a Hall effect sensor arranged in the front face of the connector housing to sense the presence of a magnetic spur near the rear face of the housing of another similar connector. In response to sensing a magnetic spur the Hall effect actuator will actuate the switch by means familiar to the person skilled in the art. A further alternative proximity sensor may be provided by a capacitance sensor where the spur located in near the rear face is adapted to change the capacitance sensed by the actuator capacitance sensor provided near the front face of the housing and thereby actuate the switch. The spur might be a luminous device providing a light source, such as an infrared light source, disposed in the rear face with the actuator provided by a light sensor tuned to be exclusively responsive to the specific spur light source to actuate the switch.
[oi7] The resulting connector is fail safe in that the overcurrent protection will be in circuit even if the proximity sensor arrangement fails. The connector is also capable of being made significantly more compact than the extender plug of GB2457217.
BRIEF DESCRIPTION OF THE EMBODIMENT [oi8] Embodiments of an extender plug constructed in accordance with the present invention will now be described, by way of example only, with reference to the accompanying illustrative figures, wherein:
Figure 2A is an isometric SW view of an extender plug;
Figure 2B is an isometric NW view of the first embodiment;
Figure 2C is a left elevation of a single extender plug and cable plugged into a wall socket;
Figure 2D is a left elevation of a first extender plug plugged into a wall socket and a second extender plug plugged into the first extender plug;
Figure 2E is a left sectional elevation of the view of figure 2D;
Figure 2F is a circuit diagram of the extender plugs shown in figures 2D and 2E;
Figure 2G is a flow chart showing the switch process implemented by the extender plug.
DETAILED DESCRIPTION OF THE EMBODIMENT [oi9] For clarity similar numerals designate similar features to the prior art connector and will not be described again.
[020] The figures show an electrical connector 10 comprising a housing 22. The housing includes a plug power port 12 comprising three conductive pins 13 adapted to be received into a corresponding mains supply socket “W”. At least one pin 13L providing electrical communication with a live line through the connector 10 and at least one pin
13N providing electrical communication with a neutral line through the connector 10.
[02i] The housing has a side wall extending between the front face 4 and the rear face 2.
The connector has an appliance power port 16 provided in the side wall adapted to receive an appliance cable 17 to place an appliance in electrical communication with the plug power port 12. The appliance power port includes a live terminal 16L, neutral terminal 16N and earth terminal 16E. A manually operable switch 16.1 [022] A socket power port 14 provides a socket to receive the pins 13’ of a compatible plug power port 12’ provided by a similar stacked extender plug 10’.
[023] The connector is provided with an overcurrent circuit protection assembly 24 having an upstream terminal 26.1 electrically communicating with the live pin 13L of the plug power port 12 and a downstream appliance terminal 26.2 electrically communicating with the live line of the appliance power port 16 and an upstream terminal 26.3.
[024] A switch 28 is arranged to communicate a live line 14L of the socket power port 14 with, at any single time, one only of the downstream terminal 26.1 or the upstream terminal 26.2. In a rest condition, the switch 28 connects the upstream terminal 26.2 to the live line 14L of the socket power port 14. The switch 28’ responds to insertion of its plug power port in a socket power port 14 of another similar connector 10 to switch to an extender plug condition where the downstream terminal 26.1 is electrically connected to the live line 14L of the socket power port 14 and the overcurrent device is thereby out of circuit with the live terminal 14L.
[025] Switch 28 is operated by an actuator 201 received into a aperture 202 formed in the front face 4. The actuator 201 is biased by spring means (not shown) to the extended condition shown at 201 so that no part of the actuator projects out of the aperture 202.
Thus when the connector 10 acting as a primary connector is plugged into a conventional socket such as the wall socket “W” the actuator is undisturbed.
[026] A spur 203 is provided on the rear face 2 corresponding to the position of the aperture
202 on the front face 4. The spur 203 is formed as a hollow cylinder having a radially outwardly projecting basal flange 204. The spur 203 is captured in a recess 205 by interaction of the basal flange 204 and a radially inwardly projecting recess flange 206.
a cylindrical helical compression spring 207 is secured over a spigot 208 and received into the hollow spur 203 to bias the spur to the projected condition shown at 203’.
However, when the connector is an extender plug connector 10 plugged into another similar connector, the spur 203 is received into the aperture 202 and displaces the actuator 201 ’ inwardly (or away from the wall socket) thereby actuating a micro switch which provides switch 28. The switch 28 thus switches from the rest condition to the extender plug condition.
[027] The spur 203 is arranged to retract at least partially into the recess when it engages with the actuator 201' as shown at 203 in figure 2E. This helps to ensure the operation of the actuator and switch 28 even if the extender plug connector is not fully inserted into the socket power port of the primary connector.
[028] The process implemented by the connector is illustrated by the flow chart in figure 2G.
At step 2.2 the connector is neither plugged into a wall socket, other extender connector plug and nothing is plugged into the socket power port. The overcurrent circuit protection device 26 is in circuit with the live appliance port terminal 16L and the live socket port terminal 14L.
[029] When the connector is plugged into a conventional wall socket (ie a socket which is not a similar connector) the connector system responds with decision step 2.3 to select condition 2.4 with the overcurrent circuit protection 26 in circuit with each of the live appliance port terminal 16L and the live socket port terminal 14L. If the connector is inserted into a similar connector at step 2.5 the switch is actuated to switch the overcurrent circuit protection out of circuit with the live socket port terminal 14L, otherwise the switch remains in the rest condition with the overcurrent circuit protection in circuit with the live terminal 14L.
Claims (11)
1. An electrical connector (10) for mains power supply comprising:
a hollow housing (22); said housing having a front face (4) and a rear face (2), a power supply port (12), a socket power port (14) an appliance power port (16) and the power supply port (12) disposed on the front face (4) and providing at least a live pin (13L) and a neutral pin (13N) to electrically communicate each one of a live line and a neutral line through the connector to corresponding live (14L, 16L) and neutral terminals (14N, 16N) in each of the appliance power port (16) and a socket power port (14);
the socket power port (14) being located on the rear face to be capable of receiving a further similar electrical connector (10);
an overcurrent protection assembly (24) having an upstream terminal (26.1) electrically communicating with the live pin (13L) and a downstream terminal (26.3), and a switch means (28);
characterized in that the switch (28) is normally biased to electrically connect the downstream terminal (26.2) to the live socket power port terminal (14L);
the switch means (28) is responsive to the connector (10’) being plugged into the socket power port (14) of another similar connector (10) to disconnect the live socket power terminal (14L) from the upstream terminal (26.2) and connect the live socket power terminal (14L) to the downstream terminal (26.1) whereby the connector fails safe.
2. A connector according to claim 1 wherein the switch (28) has:
an actuator (201) and a spur (203), said actuator (201) being responsive to the proximity of the spur (203) of another similar connector (10’), when the connector (10’) is plugged into the socket power port (14).
3. A connector according to claim 2 wherein the actuator (201) is located on the front face (4) and the spur (203) is located on the rear face (8).
4. A connector according to claim 3 wherein:
the actuator (201) is displaceable between a forward position and a rearward position and located in an aperture (204) formed in the front face (4), said actuator being biased to a forward position where no part of the actuator (4) projects above the front face (4), said spur (203) being receivable into the aperture (204) to engage the actuator and displace the actuator to a rear position and thereby to actuate the switch (28).
5. A connector according to any one of claims 2 to 4 wherein the spur (203) is received into a recess (205) to be displaceable from a rear position to a forward position in opposition to a bias.
6. A connector according to claim 5 wherein the bias is provided by a coiled compression spring (207) mounted on a spigot and received into a cylindrical hollow body of the spur (203).
7. A connector according to one of claims 5 and 6 wherein the spur (203) can be displaced to be substantially flush with the rear surface (2).
8. A connector according to any one of claims 1 to 3 wherein the actuator is a magnetic actuator disposed near the front face of the housing to actuate the switch in response to the proximity of a spur of magnetic material located in the housing of a similar connector located near the rear face of the housing.
9. A connector according to any one of claims 1 to 3 wherein the actuator is a hall effect device located in the front face of the housing to be responsive to a magnetic spur provided in the rear face of a housing of a similar connector when plugged into the similar connector, to actuate the switch.
10. A connector according to any one of claims 1 to 3 wherein the actuator is a capacitance sensor arranged to sense a change in capacitance in the proximity of a capacitance spur located in the rear face of another similar connector.
11. A connector according to any one of claims 1 -3 wherein the actuator is an optical sensor arranged to respond exclusively to light emitted by a luminous spur.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1715574.8A GB2566749A (en) | 2017-09-26 | 2017-09-26 | An electrical connector for mains power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1715574.8A GB2566749A (en) | 2017-09-26 | 2017-09-26 | An electrical connector for mains power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201715574D0 GB201715574D0 (en) | 2017-11-08 |
| GB2566749A true GB2566749A (en) | 2019-03-27 |
Family
ID=60244283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1715574.8A Withdrawn GB2566749A (en) | 2017-09-26 | 2017-09-26 | An electrical connector for mains power supply |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2566749A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5946180A (en) * | 1998-08-26 | 1999-08-31 | Ofi Inc. | Electrical connection safety apparatus and method |
| GB2457217A (en) * | 2007-04-11 | 2009-08-12 | Baruch Entpr Ltd | Cascadable electrical connector |
| KR20130043554A (en) * | 2011-10-20 | 2013-04-30 | 조종길 | Plug and concert |
-
2017
- 2017-09-26 GB GB1715574.8A patent/GB2566749A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5946180A (en) * | 1998-08-26 | 1999-08-31 | Ofi Inc. | Electrical connection safety apparatus and method |
| GB2457217A (en) * | 2007-04-11 | 2009-08-12 | Baruch Entpr Ltd | Cascadable electrical connector |
| KR20130043554A (en) * | 2011-10-20 | 2013-04-30 | 조종길 | Plug and concert |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201715574D0 (en) | 2017-11-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |