EP3192132B1 - Socket outlet - Google Patents
Socket outlet Download PDFInfo
- Publication number
- EP3192132B1 EP3192132B1 EP15839549.1A EP15839549A EP3192132B1 EP 3192132 B1 EP3192132 B1 EP 3192132B1 EP 15839549 A EP15839549 A EP 15839549A EP 3192132 B1 EP3192132 B1 EP 3192132B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plug
- socket
- well
- contact
- ground
- 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.)
- Active
Links
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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
- H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
- H01R13/629—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances
- H01R13/631—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for engagement only
-
- 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
- H01R13/64—Means for preventing incorrect coupling
- H01R13/641—Means for preventing incorrect coupling by indicating incorrect coupling; by indicating correct or full engagement
-
- 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
- H01R24/76—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure with sockets, clips or analogous contacts and secured to apparatus or structure, e.g. to a wall
- H01R24/78—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure with sockets, clips or analogous contacts and secured to apparatus or structure, e.g. to a wall with additional earth or shield contacts
-
- 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
Definitions
- the present invention concerns contacts for connection to a power supply network, in particular a socket with facilitated entry of a plug.
- Movable electrotechnical equipment typically has a power cord with a plug, and connects to a power supply network by inserting the plug into a socket, which is permanently connected to the power supply network.
- a socket which is permanently connected to the power supply network.
- the terminals with live voltage are available through contact holes in the socket, and that the plug has protruding contact pins fitting into the contact holes.
- the shape of contact pins and their corresponding contact holes vary. For example, blade shaped contact pins are used in USA, whereas cylindrical contact pins are usual in Europe.
- Some contacts are polarised, i.e. that certain contact pins should be connected to certain current conducting wires denoted line (L) and neutral (N).
- ground terminals are at a fixed ground potential, and accordingly do not convey electrical power during normal operation, the ground terminals can be exposed in the socket.
- the ground terminals can also have different design in different countries. For example, a spring biased ground clip adapted to a groove in the plug is common in Germany and several other European countries, while a ground pin adapted to a hole in the plug is common in France.
- one objective of the present invention is that a European implementation must be able to receive plugs, but not necessarily all plugs that can be received in a socket of type CEE 7/7.
- an objective is that the socket ccording to the present invention should be able to receive a plug of a kind that is delivered with equipment sold for domestic use also in countries with different standards, e.g. Great B ritai n and USA, typically for 110 V or 220-240 V network voltage.
- US 1 812 343 A discloses a socket with a short and a long guiding groove that guides contact pi ns on a plug toward respective openings in the socket when the plug is pressed against them. At the same time, this causes the plug to turn with respect to the socket.
- DE 653 597 C discloses a similar socket with two opposing, semi-circular concave faces that are inclined in opposite di rections toward respective contact holes such that the contact pins slides toward the contact hole, and the plug turns accordingly, when the plug is pressed against the socket.
- D E 20202496 U1 discloses a socket comprising a cup shaped well comprising contact holes shaped to receive contact pins of a connecting plug. The construction aims to improve the plugging of the connecting plug. This document is considered to disclose the preamble of independent claim 1.
- US5447443 A discloses an actuator placed between an existing electrical plug and an existing electrical outlet.
- the actuator removes the plug from the outlet upon axial movement of the actuator.
- the actuator converts the manual twisting force into a pushing force and gradually forces the plug in an axial direction away from the outlet.
- the sockets have a child safety device, i.e. equipment to prevent children from getting into contact with the power supply network.
- the child safety device is typically a lid over the contact holes and/or a device that requires that the contact pins can only be inserted if they are pressed against both contact holes simultaneously.
- an additional purpose of the present invention is to provide a socket with such universal design.
- Existing outlets can be mounted entirely on the outside of a wall, or they can have permanent connections to the power supply network in a box embedded in the wall, and just a cover at the outside of the wall. In both cases, there is a desire to be able to retrofit a socket in an existing installation.
- T he objective of the present invention is thus to provide a socket that satisfies at least one of the needs above, and that preserves advantages from prior art.
- the invention provides a socket comprising a cover with a cylindrical well having greater diameter than an enveloping cylinder about an existing, predefined plug, at least two contact holes adapted to receive contact pins for transmitti ng electrical power, wherein each contact hole is located at the bottom of a concave contact pin-guide.
- the socket has ground terminals arranged in the well.
- the well further comprises two protrudi ng elements with mutual parallel, plane side faces in the longitudinal direction of the well, guiding grooves that extend radially outward from a mid-section on the plane side faces and that extend from the bottom of the well to top faces on the protruding elements.
- the side faces are adapted to the plug, for example a plug accordi ng to C E E 7/7, and the guiding grooves are in that case adapted to the guiding ribs on the plug.
- the side faces and the guide grooves take up loads applied to the plug while it is inserted in the socket, and can also contribute with friction force in order to retain the plug in the well.
- a first top face on each protruding element is oriented perpendicular on the well's axis of rotation symmetry, and a second top face on each protruding element forms a helical face along the cylindrical wall of the well and has the least distance to the bottom of the well at the guiding groove.
- the first top faces prevent further axial motion of the plug in the well when the plug is not correctly oriented in the well.
- this socket may be suitable for polarised contacts. When the plug is correctly oriented in the well, it will slide along the helical top faces and thereby move axially until the contact pins are inserted in the contact holes.
- the contact pins on the plug slide along the concave guides toward the contact hole. Thereby, the plug is rotated about the cylindrical well's axis of rotation symmetry.
- the contact pins of the plug is longer than the distance between the contact holes and the top of the ground terminals. Thereby, the plug may rotate in the well unhindered by the ground terminals.
- the contact pin-guides have an inclination from their respective contact holes to a narrower and shallower part of the contact pin-guides. Viewed from above, the contact pin-guides will thereby have large open surfaces facing upwards near the contact holes, and gradually smaller open surfaces in a rotational direction away from the contact holes. If the contact pi ns on the plug engage a narrower part of the contact pi n-gui des, the plug will rotate toward the contact holes in a certain direction, e.g. counterclockwise.
- the cover is attached by a snap-lock to a contact box. This facilitates mounting of the cover once the contact box is mounted on a wall or similar.
- the helical face preferably has the same inclination as the bottom of the contact pin-guides.
- the top face support the sides of the plug, the guide ribs in the example above, at the same time as the contact pin-guides slide along the contact pin-guides toward the contact holes.
- the socket preferably also has a guide from an outer face of the cover toward the well. This guide guides the plug toward the well when it is moved against the outer surface of the cover.
- ground terminal in the claims comprise these and other elements for connecting a plug to ground.
- ground clip and ground pin in the following description be understood as examples of "ground terminal” as the term is used in the claims.
- Figures 1 and 2 are perspective views of a socket 100 with ground terminals 112, a cover 120 and a guide 123 that leads from an outer surface on the cover 120 toward a well 130 for receiving a plug 300 ( Fig. 3 ).
- Figure 1 also shows a connection box 110 filling into a standard wall box.
- the cover has an integrated and resilient snap-lock 116 retaining it to the connection box 110.
- the connection box 110 has one or more openings (not shown) for a ground cable from the power supply network.
- T rough-shaped contact pin-guides 141, 142 is fixedly disposed in the bottom of the well 130, and are best shown in figure 2 .
- Contact holes 121 for contact pins on a plug 200 are located in the bottom of the trough shaped contact pin-guides 141, 142.
- the contact pins When a plug is inserted into the well 130, the contact pins will slide along the guiding faces 141 and 142 and along an imagined helical face down to their respective contact holes 121.
- the contact pin-guides 141 and 142 have an inclination from their respective contact holes 121 to a narrower and shallower part of the contact pin-guides 141, 142, i.e. clockwise in figure 2 .
- Figure 3 illustrates a plug 200 inserted in a socket 100.
- the plug 200 is of type CEE 7/7 and the socket 100 is adapted this plug and compatible types.
- the line IV-IV illustrates an imaginary plane through the centre of the contact pins on such a plug 200, and also through the centre of the contact holes 121 in the socket 100.
- the socket 200 has a cylinder face 230 with diameter slightly less than the well 130 shown in the preceding figures.
- the cylinder face 230 is broken by a plane 231, which in the shown position is parallel to the paper plane.
- a guide rib 232 protrudes from the plane 231 and is encompassed by an imaginary extension of the cylinder face 230 such that the guide rib 232 can pass down into the cylindrical well 130 shown in figures 1 and 2 .
- a similar plane 231 with guide rib 232 is provided on the diametrically opposite side of the plug 200.
- the cover 210 is attached to the connection box 110 by means of snap-lock 116.
- the snap-lock 116 is here an integrated and resilient part of the cover.
- the snap-lock 116 slides along the wall of the connection box.
- the snap-lock 116 is biased inwardly toward the connection box 110 such that shoulder or the like against an edge on the connection box 110 retains the cover on the connection box 110.
- the cover can alternatively be attached to the connection box 110 with one or more screw(s) in a known manner.
- Figure 4 is a section along the plane IV-IV in figure 3 .
- the plug 200 is not part of the invention, and is therefore shown without inner details.
- a guide 123 between the outer surface of the cover 120 and the well 130 leads the plug toward the well 130 when the plug 200 is inserted.
- the guide 123 is shown as a concave, rounded transition, whereas it is shown as a frusto-conical transition in the figures 9-11 . It should be understood that any shape guiding the plug 200 to toward the well 130 may be used. In the position shown in Fig.
- the contact pins 221 of the plug is barely inserted in the contact holes 121, and the bottom of the plug 200, from which the contact pins 221 extend, is located within the guide 123, but above the ground clip 112. It is understood that the distance between the bottom of the contact pin-guides 141, 142 and the top of the ground clip 112 must be less than the length of the contact pins 121. In a C E E 7/7 plug, the length of the contact pins 221 19 mm.
- the top of the ground clips 112 are e.g. 16-18 mm over the bottom of the contact pin-guides 141, 142 such that the plug 200 can rotate unhindered or unobstructed by the ground clips 112.
- the distance from the contact holes 121 to the top of other types of ground contacts e.g. aground pin in a French socket (150 in figures 8-10 ), be less than the length of the contact pins 221.
- Figure 4 also shows how a lower edge of the snap-lock 116 engages an edge on the connection box 110 and thereby retai ns the cover.
- FIG. 5 is a top view of the connection box 110, more particularly the socket from the precedi ng figures viewed from above without cover.
- the connection box 110 comprises a plate 1100 with fastening holes 1101 for attachment to a wall or similar, for example with screws.
- Electric ground potential is supplied through two diametrically opposed ground clips 112 to complementary ground rails on the plug (not shown in Fig. 5 ).
- the ground clips 112 are radially biased inwardly, and slide along the axially directed ground rail when the plug is inserted or withdrawn.
- a ground terminal 1120 is connected to ground in the power supply network.
- the ground terminal 1120 can be a ground rail fixedly attached to the ground clips 112, which in that case is attached to the connection f ⁇ box 110.
- the ground clips 112 can be attached to a ground rail on the cover (not shown in figure 5 ), which engages the ground terminal 1120 when the cover is mounted.
- Sliding terminals 111 in the extension of the contact holes 121 is, when in use, electrically connected to the live connectors in the power supply network, and provide both mechanical and electrical connections to the contact pins (221, fig. 4 ) on the plug.
- Figure 6 shows the socket 100 in the same scale and orientation as the connection box 110 in figure 5 .
- a cover 120 is mounted on the connection box 110 in Fig. 5 .
- the cover comprises the top plate 120, which is not necessarily plane.
- the ground clips 112 are located in openings on the cover 120, and the axis between the ground clips 112 is perpendicular to the axis through the centres of the contact holes 121.
- FIG 7 shows the socket from a side that is perpendicular to the side shown in figure 3 .
- the ground clips 112 are located in openings 114 through the wall of the cover 120.
- the ground clips 112 can be partly pushed outward and into the opening 114.
- the bias will force the ground clip 112 against a complementary ground rail (212, fig. 10 ) on the plug.
- the socket in figures 1-7 it does not matter which contact pin on the plug is inserted into which contact hole 121 in the socket, and the originally German "schuko"-contact with two symmetrically placed ground clips 112 is used as example.
- the symmetrically ground clips 112 are replaced with an asymmetrically placed ground pin 150 to illustrate a polarised socket, i.e. a contact where each contact pin must be inserted in a certain contact hole.
- the plug of type C E E 7/7 has a hole to receive one ground pin 150 from an originally French standard, and is therefore used as example.
- Figure 8 shows a socket according to the invention viewed from above.
- a plug 200 may have a substantially cylindrical outer face 230 cut by two planes 231, each with a protrudi ng guiding rib 232.
- the embodiment in the figures 8-10 has similarly a substantially cylindrical well 130 with protruding elements 131 and guide groves 132 adapted to a plug of type CEE 7/7 and compatible types.
- the guide grooves 132 extend radially outward from parallel plane side faces toward the cylinder wall in the well 130, i.e. along an axis through the centres of contact holes 121 in the contact pin-guides 141, 142.
- the plane IX-IX is perpendicular to this axis, and cuts through the centre of the contact pin 150 in figure 8 .
- the guide grooves 132 extend from the bottom of the well 130 to top faces 1210 and 1311.
- the top faces 1310 are diametrically opposing each other, and the top faces 1311 are diametrically opposing each other.
- the variant with German ground clips can advantageously also be provided with similar protrudi ng elements or guiding faces 131 and guide grooves 132.
- the "embodiment” should here and in the following be construed as a contact with guide faces 131, 132 etc. in the well, regardless of whether the grounding comprises clips as in the socket of figure 6 or a pin as in the embodi ment of figure 8 .
- Figure 9 is a section along the plane IX-IX in figure 8 , and illustrates the preferred embodiment of the protruding elements 131.
- the guide 123 and the contact pin-guides 141, 142 are as in the socket in the figures 1-7 , and are not descri bed again here.
- the part 1310 of the top face for the element 131 here extends perpendicular to the well's axis of rotation symmetry, and is placed at a sufficient distance from the bottom of the well 130 to allow the plug 200 to rotate over the ground pi n 150 when the guide rib 232 of the plug ( figures 3 and 10 ) slides along the top face part 1310.
- a nother part 1311 of the top face of the element 131 is inclined downwardly toward the guide groove 132.
- the top face 1311 in this embodi ment a helical face with inclination in the same direction as the plug will be guided toward the contact holes 121 during insertion into the socket, i.e. counterclockwise in figure 8 and toward the left hand side of figure 9 .
- the plug in figure 3 can move axially down on the ground pin 150 when a guide rib 232 on the plug slides along the part 1311 of the top face, but not when it slides along the part 1310 of the top face.
- Figure 10 shows the plug 200 with contact pi ns 221 engaging the bottom of the contact pin-guides 141, 142.
- the guide ribs 232 is supported by both top faces 130, which are diametrically opposite each other, see Fig. 8 .
- the rotational axis of the plug 200 parallel to the axis of the ground pin 150.
- the axis of rotation remains parallel to the pin 150, which thereby will slide easily into the corresponding hole in the plug if the plug is correctly oriented in the well. That is, the axis of the ground hole in the plug 200 cannot possibly be inclined rel ative to the ground pin 150.
- the plug must be oriented 180é erroneous, such that the N-pin is aligned with the L-hole and vice versa.
- a small rotation in the opposite direction will move the guide ribs over the top faces 1311, which here are helical, such that the contact pins 221 are guided axially downward toward the contact holes 121.
- the user quickly receives a tactile feedback on the correct direction of rotation even with horizontal guiding faces 130, more precisely top faces 1310 that are perpendicular to the well's axis of rotation symmetry at a distance from the contact holes 121 that is larger than the length of the contact pins 221 of the plug.
- the variant in figures 9 and 10 can be advantageous in polarised contacts, here exemplified by the eccentric pin 150, because the guide is asymmetric.
- Figure 11 shows an alternative exemplary arrangement of the top faces 1310 and 1311, where both pairs of top faces 1310, 1311 extend perpendicular to the well's axis of rotation symmetry, i.e. parallel to the paper plane in figure 8 .
- the height from the contact holes 121 to the top faces 1310, 1311 of the protruding elements 131 preferably adapted such that the contact pins 221 of the plug can slide unobstructed along the bottom of the contact pin-guides 141, 142 during insertion of the plug.
- the groove 132 then receives the guide rib 232 on the plug only when the plug is inserted fully into the socket, and contributes with friction force to retain the plug and also by taking up forces applied to the plug when it is plugged into the socket 100.
- Figure 12 shows a further alternative arrangement of the protruding elements 131, where both top faces 1310 and 1311 are inclined downward toward the guide groove 132.
- This non-claimed arrangement facilitates insertion of the guide rib 232 into the guide groove 132. Support from the top faces align the hole in the plug with the ground pin 150 as in the embodiment in the figures 9 and 10 .
- the non-claimed arrangement in figure 12 does not support 180é rotation as the embodiment in figures 9 and 10 .
- the non-claimed arrangement in figure 12 contributes with friction force and support against lateral forces on the top of the plug 200 when it is fully inserted in the socket.
- the ground pin 150 is sufficiently long to ensure that the plug 200 is grounded before the contact pins 221 engages the live terminals.
- T his is a common requirement in standards for sockets with ground terminals, CEE 7/7 included.
- the length of the contact pi n 150 can be adapted the guides in the socket 100, the length of the contact pins 221 on the plug 200 and the distance from the top faces 1310, 1311 to the live terminals (not shown) in the socket 100.
- the inclined face 1311 has the same inclination as the bottom of the contact pin-guides 141 and 142.
- top faces 1310 and 1311 together with the ground pin 150 provide a tactile feedback to the user on the orientation of the plug, and that the asymmetric shape in figure 9 , specifically the horizontal faces 1310, especially facilitates changing the orientation of the plug in the well 130.
- Figure 13 illustrates a socket 100 with guiding faces 1310 and 1311 as described in connection with figures 8-12 , but with a ground clip 112 replacing the ground pin 150.
- the top plate 120 with the transition 123 and the trough-shaped symmetrical guides 141 and 142 are descri bed above.
- Figure 14 is similar to figure 13 , but has a ground pin 150 rather than the ground clips 112. Both arrangements shown in figures 13 and 14 can be used with a plug accordi ng to the European standard CEE 7/7, and represent an unpolarised contact and a polarised contact, respectively. Furthermore, it is understood that the invention is not limited to CEE 7/7, and that guides similar to the top faces 1310 and 1311 in figure 9 can be used in other types of contacts.
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- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Connector Housings Or Holding Contact Members (AREA)
- Automatic Analysis And Handling Materials Therefor (AREA)
- Dry Shavers And Clippers (AREA)
- Connecting Device With Holders (AREA)
Description
- The present invention concerns contacts for connection to a power supply network, in particular a socket with facilitated entry of a plug.
- Movable electrotechnical equipment typically has a power cord with a plug, and connects to a power supply network by inserting the plug into a socket, which is permanently connected to the power supply network. Currently, about 20 such connections are in use in different countries. Common to all, is that the terminals with live voltage are available through contact holes in the socket, and that the plug has protruding contact pins fitting into the contact holes. The shape of contact pins and their corresponding contact holes vary. For example, blade shaped contact pins are used in USA, whereas cylindrical contact pins are usual in Europe. Some contacts are polarised, i.e. that certain contact pins should be connected to certain current conducting wires denoted line (L) and neutral (N). Other contacts are unpolarised, wherein it is irrelevant which contact pin is connected to current conducting wire L or N. Both polarised and unpolarised contacts can be grounded or ungrounded. This description regards a grounded socket, which has terminals connected to electrical ground (earth) in addition to the current conducting terminals for the contact pins of the plug. Because the ground terminals are at a fixed ground potential, and accordingly do not convey electrical power during normal operation, the ground terminals can be exposed in the socket. The ground terminals can also have different design in different countries. For example, a spring biased ground clip adapted to a groove in the plug is common in Germany and several other European countries, while a ground pin adapted to a hole in the plug is common in France.
- In order to facilitate sale of electrical apparatuses, and to make it convenient for travellers to bring along electrical apparatuses from one country to another, electrotechnical equipment, including plugs and sockets, becomes ever more standardised. US International Trade Administration (ITA) has accorded letters A-N to the most common connections, and a European standard, Certification of Electrotechnical Equipment (CEE) applies to electrotechnical equipment in most of Europe. For example, most electrical apparatuses in Europe except Great Britain and Ireland are delivered with a grounded plug of type CEE 7/7, which is included in ITA's type F. This plug is used as an example in the following. One skilled in the art can without inventive effort adapt the example to other types of contacts. Other contact types will also be descri bed when relevant.
- It is impractical to have to change plug on lamps, ovens and other electrotechnical equi pment in order to adapt the equipment to the invention. Because European electrotechnical equipment currently is delivered with a plug of the type C E E 7/7 and compatible types, one objective of the present invention is that a European implementation must be able to receive plugs, but not necessarily all plugs that can be received in a socket of type CEE 7/7. In general, an objective is that the socket ccording to the present invention should be able to receive a plug of a kind that is delivered with equipment sold for domestic use also in countries with different standards, e.g. Great B ritai n and USA, typically for 110 V or 220-240 V network voltage.
-
US 1 812 343 A discloses a socket with a short and a long guiding groove that guides contact pi ns on a plug toward respective openings in the socket when the plug is pressed against them. At the same time, this causes the plug to turn with respect to the socket. -
DE 653 597 C discloses a similar socket with two opposing, semi-circular concave faces that are inclined in opposite di rections toward respective contact holes such that the contact pins slides toward the contact hole, and the plug turns accordingly, when the plug is pressed against the socket. - D E 20202496 U1 discloses a socket comprising a cup shaped well comprising contact holes shaped to receive contact pins of a connecting plug. The construction aims to improve the plugging of the connecting plug. This document is considered to disclose the preamble of independent claim 1.
-
US5447443 A discloses an actuator placed between an existing electrical plug and an existing electrical outlet. The actuator removes the plug from the outlet upon axial movement of the actuator. The actuator converts the manual twisting force into a pushing force and gradually forces the plug in an axial direction away from the outlet. - Some countries, for example Denmark, Finland, Norway and Sweden, require that the sockets have a child safety device, i.e. equipment to prevent children from getting into contact with the power supply network. The child safety device is typically a lid over the contact holes and/or a device that requires that the contact pins can only be inserted if they are pressed against both contact holes simultaneously.
- Furthermore, there is an increased attention on so-called universal design, i.e. that buildings, apartments, offices and items in daily use are designed such that people with reduced abilities can use them without help or additional adaptation. Thus, an additional purpose of the present invention is to provide a socket with such universal design.
- Existing outlets can be mounted entirely on the outside of a wall, or they can have permanent connections to the power supply network in a box embedded in the wall, and just a cover at the outside of the wall. In both cases, there is a desire to be able to retrofit a socket in an existing installation.
- T he objective of the present invention is thus to provide a socket that satisfies at least one of the needs above, and that preserves advantages from prior art.
- This objective is attained with a socket according to claim 1.
- In particular, the invention provides a socket comprising a cover with a cylindrical well having greater diameter than an enveloping cylinder about an existing, predefined plug, at least two contact holes adapted to receive contact pins for transmitti ng electrical power, wherein each contact hole is located at the bottom of a concave contact pin-guide. The socket has ground terminals arranged in the well.
- The well further comprises two protrudi ng elements with mutual parallel, plane side faces in the longitudinal direction of the well, guiding grooves that extend radially outward from a mid-section on the plane side faces and that extend from the bottom of the well to top faces on the protruding elements. The side faces are adapted to the plug, for example a plug accordi ng to C E E 7/7, and the guiding grooves are in that case adapted to the guiding ribs on the plug. The side faces and the guide grooves take up loads applied to the plug while it is inserted in the socket, and can also contribute with friction force in order to retain the plug in the well.
- A first top face on each protruding element is oriented perpendicular on the well's axis of rotation symmetry, and a second top face on each protruding element forms a helical face along the cylindrical wall of the well and has the least distance to the bottom of the well at the guiding groove. In this socket, the first top faces prevent further axial motion of the plug in the well when the plug is not correctly oriented in the well. Thus, this socket may be suitable for polarised contacts. When the plug is correctly oriented in the well, it will slide along the helical top faces and thereby move axially until the contact pins are inserted in the contact holes.
- When a plug is inserted in the well, the contact pins on the plug slide along the concave guides toward the contact hole. Thereby, the plug is rotated about the cylindrical well's axis of rotation symmetry.
- In one embodiment, the contact pins of the plug is longer than the distance between the contact holes and the top of the ground terminals. Thereby, the plug may rotate in the well unhindered by the ground terminals.
- The contact pin-guides have an inclination from their respective contact holes to a narrower and shallower part of the contact pin-guides. Viewed from above, the contact pin-guides will thereby have large open surfaces facing upwards near the contact holes, and gradually smaller open surfaces in a rotational direction away from the contact holes. If the contact pi ns on the plug engage a narrower part of the contact pi n-gui des, the plug will rotate toward the contact holes in a certain direction, e.g. counterclockwise.
- In some embodiments, the cover is attached by a snap-lock to a contact box. This facilitates mounting of the cover once the contact box is mounted on a wall or similar.
- The helical face preferably has the same inclination as the bottom of the contact pin-guides. Thereby, the top face support the sides of the plug, the guide ribs in the example above, at the same time as the contact pin-guides slide along the contact pin-guides toward the contact holes.
- The socket preferably also has a guide from an outer face of the cover toward the well. This guide guides the plug toward the well when it is moved against the outer surface of the cover.
- Further features and advantages of the present i nventi on appear in the dependent clai ms and the following detailed description.
- The invention will be descri bed in greater detail in the following by means of exemplary embodiments with reference to the accompanying drawings, in which:
- Fig. 1
- is a perspective view of an exemplary socket, not part of the invention, viewed from a first viewpoint;
- Fig. 2
- is a perspective view of the socket in
Fig. 1 viewed from a second viewpoint; - Fig. 3
- is a side view of the socket in
Figs. 1 and 2 with a partially inserted plug; - Fig. 4
- is a section along the plane IV-IV in
Fig. 3 ; - Fig. 5
- is a top view of a connection box for the socket in
figures 1-4 ; - Fig. 6
- is a top view of the connection box in
figure 5 with a cover; - Fig. 7
- is a side view of the socket viewed from a side oriented 90° from the side shown in
figure 3 ; - Fig. 8
- shows a part of the socket according to the invention viewed from above;
- Fig. 9
- is a section along the plane IX-IX in
figure 8 ; - Fig. 10
- is a section along the planeX-X in
figure 8 ; - Fig. 11
- illustrates a guide with two parallel top faces, not part of the invention;
- Fig. 12
- illustrates a guide with two inclined faces, not part of the invention;
- Fig. 13
- is a perspective view of a socket with ground clip, not part of the invention; and
- Fig. 14
- is a perspective view of a socket with ground pin, not part of the invention.
- The drawings are schematic, and not necessarily to scale. Several details known to those skilled in the art are omitted for clarity. In the
figures 1-7 so-called "schuko" ground clips serve as a first example onground terminals 112, while aground pin 150 serves as an example in thefigures 8-12 . The term ground terminal in the claims comprise these and other elements for connecting a plug to ground. Furthermore, the terms ground clip and ground pin in the following description be understood as examples of "ground terminal" as the term is used in the claims. -
Figures 1 and 2 are perspective views of asocket 100 withground terminals 112, acover 120 and aguide 123 that leads from an outer surface on thecover 120 toward a well 130 for receiving a plug 300 (Fig. 3 ).Figure 1 also shows aconnection box 110 filling into a standard wall box. The cover has an integrated and resilient snap-lock 116 retaining it to theconnection box 110. Theconnection box 110 has one or more openings (not shown) for a ground cable from the power supply network. T rough-shaped contact pin-guides figure 2 . Contact holes 121 for contact pins on aplug 200 are located in the bottom of the trough shaped contact pin-guides guides guides figure 2 . -
Figure 3 illustrates aplug 200 inserted in asocket 100. In this example, theplug 200 is of type CEE 7/7 and thesocket 100 is adapted this plug and compatible types. The line IV-IV illustrates an imaginary plane through the centre of the contact pins on such aplug 200, and also through the centre of the contact holes 121 in thesocket 100. - The
socket 200 has acylinder face 230 with diameter slightly less than the well 130 shown in the preceding figures. Thecylinder face 230 is broken by aplane 231, which in the shown position is parallel to the paper plane. Aguide rib 232 protrudes from theplane 231 and is encompassed by an imaginary extension of thecylinder face 230 such that theguide rib 232 can pass down into the cylindrical well 130 shown infigures 1 and 2 . Asimilar plane 231 withguide rib 232 is provided on the diametrically opposite side of theplug 200. - As mentioned in connection with
figure 1 , the cover 210 is attached to theconnection box 110 by means of snap-lock 116. The snap-lock 116 is here an integrated and resilient part of the cover. When mounting the cover on theconnection box 110, the snap-lock 116 slides along the wall of the connection box. When the cover is mounted, the snap-lock 116 is biased inwardly toward theconnection box 110 such that shoulder or the like against an edge on theconnection box 110 retains the cover on theconnection box 110. The cover can alternatively be attached to theconnection box 110 with one or more screw(s) in a known manner. -
Figure 4 is a section along the plane IV-IV infigure 3 . Theplug 200 is not part of the invention, and is therefore shown without inner details. Aguide 123 between the outer surface of thecover 120 and the well 130 (fig. 1 ) leads the plug toward the well 130 when theplug 200 is inserted. Infigure 4 , theguide 123 is shown as a concave, rounded transition, whereas it is shown as a frusto-conical transition in thefigures 9-11 . It should be understood that any shape guiding theplug 200 to toward the well 130 may be used. In the position shown inFig. 4 , the contact pins 221 of the plug is barely inserted in the contact holes 121, and the bottom of theplug 200, from which the contact pins 221 extend, is located within theguide 123, but above theground clip 112. It is understood that the distance between the bottom of the contact pin-guides ground clip 112 must be less than the length of the contact pins 121. In a C E E 7/7 plug, the length of the contact pins 221 19 mm. Thus, in the example onfigure 4 , the top of the ground clips 112 are e.g. 16-18 mm over the bottom of the contact pin-guides plug 200 can rotate unhindered or unobstructed by the ground clips 112. Similarly, the distance from the contact holes 121 to the top of other types of ground contacts, e.g. aground pin in a French socket (150 infigures 8-10 ), be less than the length of the contact pins 221. -
Figure 4 also shows how a lower edge of the snap-lock 116 engages an edge on theconnection box 110 and thereby retai ns the cover. -
Figure 5 is a top view of theconnection box 110, more particularly the socket from the precedi ng figures viewed from above without cover. Theconnection box 110 comprises aplate 1100 withfastening holes 1101 for attachment to a wall or similar, for example with screws. Electric ground potential is supplied through two diametrically opposed ground clips 112 to complementary ground rails on the plug (not shown inFig. 5 ). For this, the ground clips 112 are radially biased inwardly, and slide along the axially directed ground rail when the plug is inserted or withdrawn. - A
ground terminal 1120 is connected to ground in the power supply network. Theground terminal 1120 can be a ground rail fixedly attached to the ground clips 112, which in that case is attached to the connectionf\box 110. Alternatively, the ground clips 112 can be attached to a ground rail on the cover (not shown infigure 5 ), which engages theground terminal 1120 when the cover is mounted. - Sliding
terminals 111 in the extension of the contact holes 121 (Fig. 6 ) is, when in use, electrically connected to the live connectors in the power supply network, and provide both mechanical and electrical connections to the contact pins (221,fig. 4 ) on the plug. -
Figure 6 shows thesocket 100 in the same scale and orientation as theconnection box 110 infigure 5 . Thus, acover 120 is mounted on theconnection box 110 inFig. 5 . The cover comprises thetop plate 120, which is not necessarily plane. The ground clips 112 are located in openings on thecover 120, and the axis between the ground clips 112 is perpendicular to the axis through the centres of the contact holes 121. -
Figure 7 shows the socket from a side that is perpendicular to the side shown infigure 3 . In the shown socket, the ground clips 112 are located inopenings 114 through the wall of thecover 120. Thus, during insertion of the plug, the ground clips 112 can be partly pushed outward and into theopening 114. When the plug is inserted, the bias will force theground clip 112 against a complementary ground rail (212,fig. 10 ) on the plug. - In the socket in
figures 1-7 it does not matter which contact pin on the plug is inserted into whichcontact hole 121 in the socket, and the originally German "schuko"-contact with two symmetrically placed ground clips 112 is used as example. In the preferred embodiment shown in thefigures 8-10 , the symmetrically ground clips 112 are replaced with an asymmetrically placedground pin 150 to illustrate a polarised socket, i.e. a contact where each contact pin must be inserted in a certain contact hole. The plug of type C E E 7/7 has a hole to receive oneground pin 150 from an originally French standard, and is therefore used as example. -
Figure 8 shows a socket according to the invention viewed from above. As discussed in connection withfigure 3 , aplug 200 may have a substantially cylindricalouter face 230 cut by twoplanes 231, each with a protrudi ng guidingrib 232. The embodiment in thefigures 8-10 has similarly a substantially cylindrical well 130 withprotruding elements 131 and guidegroves 132 adapted to a plug of type CEE 7/7 and compatible types. Theguide grooves 132 extend radially outward from parallel plane side faces toward the cylinder wall in the well 130, i.e. along an axis through the centres ofcontact holes 121 in the contact pin-guides contact pin 150 infigure 8 . Theguide grooves 132 extend from the bottom of the well 130 totop faces 1210 and 1311. The top faces 1310 are diametrically opposing each other, and the top faces 1311 are diametrically opposing each other. - The variant with German ground clips, e.g. as shown in
Fig. 6 , can advantageously also be provided with similar protrudi ng elements or guiding faces 131 and guidegrooves 132. The "embodiment" should here and in the following be construed as a contact with guide faces 131, 132 etc. in the well, regardless of whether the grounding comprises clips as in the socket offigure 6 or a pin as in the embodi ment offigure 8 . -
Figure 9 is a section along the plane IX-IX infigure 8 , and illustrates the preferred embodiment of theprotruding elements 131. Theguide 123 and the contact pin-guides figures 1-7 , and are not descri bed again here. Thepart 1310 of the top face for theelement 131 here extends perpendicular to the well's axis of rotation symmetry, and is placed at a sufficient distance from the bottom of the well 130 to allow theplug 200 to rotate over theground pi n 150 when theguide rib 232 of the plug (figures 3 and10 ) slides along thetop face part 1310. - A
nother part 1311 of the top face of theelement 131 is inclined downwardly toward theguide groove 132. As theinclined face 1311 extends along a cylinder wall, thetop face 1311 in this embodi ment a helical face with inclination in the same direction as the plug will be guided toward the contact holes 121 during insertion into the socket, i.e. counterclockwise infigure 8 and toward the left hand side offigure 9 . Thus, the plug infigure 3 can move axially down on theground pin 150 when aguide rib 232 on the plug slides along thepart 1311 of the top face, but not when it slides along thepart 1310 of the top face. -
Figure 10 shows theplug 200 with contact pi ns 221 engaging the bottom of the contact pin-guides guide ribs 232 is supported by both top faces 130, which are diametrically opposite each other, seeFig. 8 . Thereby, the rotational axis of theplug 200 parallel to the axis of theground pin 150. When theplug 200 rotates such that the guide ribs slide along the helical faces 1311, the axis of rotation remains parallel to thepin 150, which thereby will slide easily into the corresponding hole in the plug if the plug is correctly oriented in the well. That is, the axis of the ground hole in theplug 200 cannot possibly be inclined rel ative to theground pin 150. If thepin 150 does not enter the hole, the plug must be oriented 180é erroneous, such that the N-pin is aligned with the L-hole and vice versa. The top faces 1310 and the contact pin-guides figure 9 support a subsequent 180é rotation. - Without the protrudi ng
elements 131, the asymmetric shape of the contact pi n-guides plug 200 is guided axially downward to the contact holes 121 regardless of where the contact pins engages. With the preferred embodiment infigure 9 , theguide ribs 232 can engage thetop face 1310 without the contact pins 221 engaging the bottom of the contact pin-guides guides figure 10 . A further rotation in the same direction, i.e. clockwise infigure 8 , will lift theplug 200 axially upward in thewell 130. A small rotation in the opposite direction will move the guide ribs over the top faces 1311, which here are helical, such that the contact pins 221 are guided axially downward toward the contact holes 121. Thus, the user quickly receives a tactile feedback on the correct direction of rotation even with horizontal guiding faces 130, more preciselytop faces 1310 that are perpendicular to the well's axis of rotation symmetry at a distance from the contact holes 121 that is larger than the length of the contact pins 221 of the plug. Thus, the variant infigures 9 and 10 can be advantageous in polarised contacts, here exemplified by theeccentric pin 150, because the guide is asymmetric. -
Figure 11 shows an alternative exemplary arrangement of the top faces 1310 and 1311, where both pairs oftop faces figure 8 . In such an arrangement, the height from the contact holes 121 to the top faces 1310, 1311 of theprotruding elements 131 preferably adapted such that the contact pins 221 of the plug can slide unobstructed along the bottom of the contact pin-guides groove 132 then receives theguide rib 232 on the plug only when the plug is inserted fully into the socket, and contributes with friction force to retain the plug and also by taking up forces applied to the plug when it is plugged into thesocket 100. -
Figure 12 shows a further alternative arrangement of theprotruding elements 131, where bothtop faces guide groove 132. This non-claimed arrangement facilitates insertion of theguide rib 232 into theguide groove 132. Support from the top faces align the hole in the plug with theground pin 150 as in the embodiment in thefigures 9 and 10 . The non-claimed arrangement infigure 12 does not support 180é rotation as the embodiment infigures 9 and 10 . As the embodiments shown infigures 9-10 , and the non-claimed arrangement shown inFig. 11 , the non-claimed arrangement infigure 12 contributes with friction force and support against lateral forces on the top of theplug 200 when it is fully inserted in the socket. - In the embodiment shown in
figures 8-10 , and in the non-claimed arangements ofFigs. 11 and 12 , theground pin 150 is sufficiently long to ensure that theplug 200 is grounded before the contact pins 221 engages the live terminals. T his is a common requirement in standards for sockets with ground terminals, CEE 7/7 included. Provided this requirement is met, the length of thecontact pi n 150 can be adapted the guides in thesocket 100, the length of the contact pins 221 on theplug 200 and the distance from the top faces 1310, 1311 to the live terminals (not shown) in thesocket 100. In a more preferred embodi ment, theinclined face 1311 has the same inclination as the bottom of the contact pin-guides - F rom
figures 8-12 with description, it should be understood that the top faces 1310 and 1311 together with theground pin 150 provide a tactile feedback to the user on the orientation of the plug, and that the asymmetric shape infigure 9 , specifically the horizontal faces 1310, especially facilitates changing the orientation of the plug in thewell 130. -
Figure 13 illustrates asocket 100 with guidingfaces figures 8-12 , but with aground clip 112 replacing theground pin 150. Thetop plate 120 with thetransition 123 and the trough-shapedsymmetrical guides Figure 14 is similar tofigure 13 , but has aground pin 150 rather than the ground clips 112. Both arrangements shown infigures 13 and 14 can be used with a plug accordi ng to the European standard CEE 7/7, and represent an unpolarised contact and a polarised contact, respectively. Furthermore, it is understood that the invention is not limited to CEE 7/7, and that guides similar to the top faces 1310 and 1311 infigure 9 can be used in other types of contacts. - The invention is described with reference to examples of a socket for a plug of a certain type, but the scope of the patent is defined by the following claims.
Claims (6)
- A socket (100) comprising a cover (120) with a cylindrical well (130) having greater diameter than an enveloping cylinder (230) about an existing, predefined plug (200), at least two contact holes (121) adapted to receive contact pins (221) for transmitting electrical power, wherein each contact hole (121) is located at the bottom of a concave contact pin-guide (141, 142), ground terminals (112; 150) arranged in the well (130), the well (130) further comprising two protruding elements (131) with mutual parallel, plane side faces in the longitudinal direction of the well, and guiding grooves (132) that extend radially outward from a mid-section on the plane side faces and that extend from the bottom of the well (130) to fi rst and second top faces (1310, 1311) on the protrudi ng elements (131),
the first top face (1310) on each protruding element (131) being oriented perpendicular to the well's axis of rotational symmetry,
the socket being characterized by:
the second top face (1311) on each protruding element (131) forming a helical face along the cylindrical wall of the well and having the least distance to the bottom of the well (130) at the guiding groove (132). - The socket (100) according to claim 1, wherein the contact pins (221) of the plug is longer than the distance between the contact holes (121) and the top of the ground terminals (112, 150).
- The socket (100) accordi ng to claim 1 or 2, wherein the contact pin-guides (141, 142) have an inclination from their respective contact holes (121) to a narrower and shallower part of the contact pin-guides (141, 142).
- The socket (100) according to any preceding claim, wherein the cover (120) is attached by a snap-lock (116) to a contact box (110).
- The socket (100) according to claim 1, wherein the helical face (1311) has the same inclination as the bottom of the contact pin-guides (141, 142).
- The socket (100) according to any preceding claim, further comprising a guide (123) from an outer face of the cover (120) toward the well (130).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20141092A NO337978B1 (en) | 2014-09-09 | 2014-09-09 | socket |
PCT/NO2015/050155 WO2016039631A1 (en) | 2014-09-09 | 2015-09-08 | Socket outlet |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3192132A1 EP3192132A1 (en) | 2017-07-19 |
EP3192132A4 EP3192132A4 (en) | 2018-03-14 |
EP3192132B1 true EP3192132B1 (en) | 2021-03-17 |
Family
ID=55459303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15839549.1A Active EP3192132B1 (en) | 2014-09-09 | 2015-09-08 | Socket outlet |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3192132B1 (en) |
CN (1) | CN107112690B (en) |
ES (1) | ES2861357T3 (en) |
NO (1) | NO337978B1 (en) |
WO (1) | WO2016039631A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015013383B3 (en) * | 2015-10-14 | 2016-10-20 | Florian Schlereth | socket |
CN116598828B (en) * | 2023-06-29 | 2023-12-19 | 深圳市电三原科技有限公司 | Power connector |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1812343A (en) * | 1929-05-11 | 1931-06-30 | Arrow Hart & Hegeman Electric | Electrical connecting device |
DE653597C (en) * | 1935-03-27 | 1937-11-27 | Erich Hengerer Dr Ing | Socket with two indentations which facilitate the insertion of the plug pins and which are separated from one another by a web and extend over the entire end face of the socket, with the bottom of which the insertion ends of the sockets are flush |
DE8107575U1 (en) * | 1981-03-16 | 1981-12-24 | Baur, Erhard, Dr., 5407 Boppard | Single or multiple quick connector socket |
DE3536951A1 (en) * | 1985-10-17 | 1987-04-23 | Geyer Gmbh & Co Christian | Two-pole plug socket |
DE8902464U1 (en) * | 1989-03-01 | 1989-08-31 | Bergel, Erwin H., Dipl.-Ing. (FH), 8021 Baierbrunn | Profile slot socket |
US5447443A (en) * | 1994-05-20 | 1995-09-05 | Ramah; Gary J. | Revolving electrical plug removal actuator |
DE10206804A1 (en) * | 2002-02-19 | 2003-09-04 | Popp Gmbh | Electrical plug socket for plugs with pins, has openings in annular groove in socket floor that exerts alignment force and/or movement on plug pins when plugging and/or turning force exerted |
DE20202496U1 (en) * | 2002-02-19 | 2003-03-06 | Popp GmbH, 95460 Bad Berneck | Flush mounted electrical socket has holes for pins having larger lead in for ease of location |
DE102004011493A1 (en) * | 2004-03-09 | 2005-09-29 | Tecpharma Licensing Ag | Dosing device for administering an injectable product comprises a drive element provided with catches arranged side by side in groups, with dosing and priming distances located between these groups |
DE102004041493A1 (en) * | 2004-08-27 | 2006-03-02 | Otto Klein | Plug socket with contact safeguarding, whose plug contact apertures receiving plug contact pins lie each in depression in bottom of plug shaft |
ES2380533B1 (en) * | 2009-07-21 | 2013-01-28 | Schneider Electric España, S.A. | EXTERNAL COVER HOLDING SYSTEM IN POWER OUTLETS |
CN102280783B (en) * | 2010-06-10 | 2015-07-08 | 北京固融科技有限公司 | Rotary electric connection device, plug, socket and patch board |
CN201820977U (en) * | 2010-06-10 | 2011-05-04 | 北京固融科技有限公司 | Rotary type electric connection device, plug, socket and wiring board |
-
2014
- 2014-09-09 NO NO20141092A patent/NO337978B1/en unknown
-
2015
- 2015-09-08 ES ES15839549T patent/ES2861357T3/en active Active
- 2015-09-08 WO PCT/NO2015/050155 patent/WO2016039631A1/en active Application Filing
- 2015-09-08 EP EP15839549.1A patent/EP3192132B1/en active Active
- 2015-09-08 CN CN201580060904.6A patent/CN107112690B/en active Active
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
EP3192132A4 (en) | 2018-03-14 |
WO2016039631A1 (en) | 2016-03-17 |
CN107112690B (en) | 2020-02-11 |
EP3192132A1 (en) | 2017-07-19 |
NO337978B1 (en) | 2016-07-18 |
CN107112690A (en) | 2017-08-29 |
ES2861357T3 (en) | 2021-10-06 |
NO20141092A1 (en) | 2016-03-10 |
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