Personal care devices, power plugs, and kits

Abstract

Personal care devices (11, 12), a power device (40), and kits including these are disclosed. The personal care devices (11, 12) and the power device (40) may have mating connectors.

Description

Technical Field

[0001] The present invention relates to personal care devices, power plugs for personal care devices, and kits using the same. In particular, the present invention relates to male and female connectors for use in personal care devices and power plugs.

Background Art

[0002] Personal care devices are widely used. Examples of such devices include hair removal, cutting, or trimming devices (shavers, body groomers, hair removal devices, etc.), or oral care devices (toothbrushes, tongue cleaning devices, or dental shower devices, etc.).

[0003] Various personal care devices are designed for use in wet conditions, such as under a shower or in a bathtub. Such personal care devices can be designed to be used in a wet state. The ability of a personal care device to withstand water ingress can be classified by an Ingress Protection (IP) rating.

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a personal care device is designed to withstand water ingress, problems related to the electrical connectors of such personal care devices and related power devices may still exist. By way of example, residual moisture can cause electrolysis of the electrical contacts and reduce the device lifespan. As a further example, ensuring the connected power device can be particularly relevant.

Means for Solving the Problems

[0005] Devices, kits, and methods are disclosed that provide various advantages over conventional power configurations.

[0006] The machine comprises a housing having a socket for inserting a plug, a first connector pin, and a second connector pin, and preferably comprises (exactly or at least) two connector pins. At least a part of the first connector pin and at least a part of the second connector pin extend into the socket. The first connector pin has a first central axis. The second connector pin has a second central axis. The first central axis and the second central axis are spaced apart by a pin distance. The first central axis and the second central axis define a first plane. The second plane is perpendicular to the first plane, extends parallel to the first central axis and the second central axis, and is equally spaced from the first central axis and the second central axis. The socket comprises a socket peripheral wall and a socket bottom wall. The socket peripheral wall includes a first peripheral wall section, a second peripheral wall section, a third peripheral wall section that curves and intersects the first plane and interconnects the first peripheral wall section and the second peripheral wall section, and a fourth peripheral wall section that curves and intersects the first plane and interconnects the first peripheral wall section and the second peripheral wall section. The first peripheral wall section and the second peripheral wall section are disposed on both sides of the first plane. The third peripheral wall section and the fourth peripheral wall section are disposed on both sides of the second plane. The second peripheral wall section includes a protruding section that forms a protrusion. The socket bottom wall is a first bottom wall section that extends transversely to the first plane and the second plane, from which the first connector pin protrudes, and a second bottom wall section that extends transversely to the first plane and the second plane, from which the second connector pin protrudes. The third plane is perpendicular to the first plane and the second plane. The first bottom wall section and the second bottom wall section may extend in the third plane. The third peripheral wall section has a radius of curvature. More specifically, the intersection line of the third peripheral wall section and the third plane has a curvature line with a radius of curvature. The ratio of the radius of curvature to the pin distance may be at most 0.35, or at most 0.33, or at most 0.31.

[0007] The power plug for a machine includes a first connector sleeve and a second connector sleeve. The first connector sleeve has a first sleeve central axis. The second connector sleeve has a second sleeve central axis. The first sleeve central axis and the second sleeve central axis are spaced apart by a sleeve distance. The first sleeve central axis and the second sleeve central axis define a first plane. A second plane is perpendicular to the first plane, extends parallel to the first sleeve central axis and the second sleeve central axis, and is equally spaced from the first sleeve central axis and the second sleeve central axis. The power plug further includes an end face in which a first pin insertion opening and a second pin insertion opening are disposed, and a circumferential connector wall extending from around the end face. The circumferential connector wall includes a first circumferential connector wall section, a second circumferential connector wall section, which is curved, intersects the first plane, and interconnects the first circumferential connector wall section and the second circumferential connector wall section, a third circumferential connector wall section, which is curved, intersects the first plane, and interconnects the first circumferential connector wall section and the second circumferential connector wall section, and a fourth circumferential connector wall section, which is curved, intersects the first plane, and interconnects the first circumferential connector wall section and the second circumferential connector wall section. The first circumferential connector wall section and the second circumferential connector wall section are disposed on both sides of the first plane. The third circumferential connector wall section and the fourth circumferential connector wall section are disposed on both sides of the second plane. The second circumferential connector wall section includes a connector notch section that forms a connector notch. The end face includes a first end face section that extends transversely to the first plane and the second plane. The first end face section includes the first connector pin insertion opening. The end face includes a second end face section that extends transversely to the first plane and the second plane. The second end face section includes the second connector pin insertion opening. A third plane is perpendicular to the first plane and the second plane. The first end face section and the second end face section may extend within the third plane. The third circumferential connector wall section has a radius of curvature. More specifically, the intersection line of the third circumferential wall section and the third plane has a curvature line having a radius of curvature. The ratio of the radius of curvature to the sleeve distance may be at most 0.35.

[0008] The kit comprises the above personal care device and / or a power device comprising the above power plug.

[0009] The kit includes a first personal care device comprising a first housing having a first socket, the first socket having a first socket geometry selected from a set of two or more different socket geometries, each assigned to a different one of several Ingress Protection (IP) ratings, the first socket geometry being assigned to a first IP rating. The kit includes a power device comprising a power plug, the power plug having a plug geometry selected from a set of two or more different plug geometries, each assigned to a different one of two or more IP ratings. The first socket is shaped to allow insertion of the power plug when the plug geometry is assigned to an IP rating equal to the first IP rating, to allow insertion of the power plug when the plug geometry is assigned to an IP rating higher than the first IP rating, and to prevent insertion of the power plug when the plug geometry is assigned to an IP rating lower than the first IP rating.

[0010] The kit comprises a power device comprising a power plug, the power plug having a first plug geometry selected from a set of two or more different plug geometries, each assigned to a different one of two or more IP ratings. The kit includes a personal care device comprising a socket having a socket geometry selected from a set of two or more different plug geometries, each assigned to a different one of two or more IP ratings. The power plug is shaped to allow insertion into the socket when the first IP rating is equal to the IP rating to which the socket geometry is assigned and when the first IP rating is greater than the IP rating to which the socket geometry is assigned. The power plug is shaped to prevent insertion into the socket when the first IP rating is less than the IP rating to which the socket geometry is assigned.

[0011] As described above, the differences between the plug geometry and the socket geometry function to ensure an appropriate mating structure for the IP rating or waterproofness of the electrically connected device. Alternatively, the differences in the geometries and mating structures of the plugs and sockets described above and below may function to ensure different compatibility purposes such as appropriate electrical parameters (voltage, current) of the power supply for the device or other things.

Brief Description of the Drawings

[0012] Embodiments will be described with reference to the drawings. In the drawings, the same or corresponding reference numerals indicate the same or corresponding elements.

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DETAILED DESCRIPTION OF THE INVENTION

[0013] Embodiments will be described with reference to the drawings. The features of the embodiments may be combined with each other unless otherwise specified.

[0014] The embodiments are described in connection with a power device for a hair removal or cutting device or an oral care device, and in connection with systems, kits, and methods that may include such personal care devices, but the technology is not limited thereto. By way of example, the socket and plug geometries disclosed herein may be used in connection with the power supply to other devices, particularly other household devices. The male and female connectors may be used to supply power to a household device, which may or may not be a personal care device. Kitchen appliances, smart mobile devices are examples of such devices.

[0015] In the embodiment, it is described that the female connector is provided on the device side and the male connector is provided on the power supply device side. However, the present invention is not limited thereto. In other embodiments, the male connector may be provided on the device side, and the female connector may be provided on the power supply device side.

[0016] Embodiments of the present invention relate to features used to supply power to a device suitable for reducing problems associated with residual moisture.

[0017] Techniques are provided that reduce the adverse effects of electric creep current and / or enable the inadvertent use of a device having a power supply device that does not have a required ingress protection (IP) rating.

[0018] As used herein, the phrases "power supply" or "supplying with power" include the supply of electrical energy to a device for use in the life of the device (e.g., for using the electrical energy supplied to drive an electromechanical actuator) and optionally the supply of electrical energy to charge a battery that may be present.

[0019] The machine comprises a housing having a socket for inserting a plug, a first connector pin, and a second connector pin. At least a part of the first connector pin and at least a part of the second connector pin extend into the socket. The first connector pin has a first central axis. The second connector pin has a second central axis. The first central axis and the second central axis are spaced apart by a pin distance. The first central axis and the second central axis define a first plane. A second plane is perpendicular to the first plane, extends parallel to the first central axis and the second central axis, and is equally spaced from the first central axis and the second central axis. The socket comprises a socket peripheral wall and a socket bottom wall. The socket peripheral wall includes a first peripheral wall section, a second peripheral wall section, which curves and intersects the first plane and interconnects the first wall section and the second wall section, a third peripheral wall section, which curves and intersects the first plane and interconnects the first wall section and the second wall section, and a fourth peripheral wall section, which curves and intersects the first plane and interconnects the first wall section and the second wall section. The first peripheral wall section and the second peripheral wall section are disposed on both sides of the first plane. The third peripheral wall section and the fourth peripheral wall section are disposed on both sides of the second plane. The second peripheral wall section includes a protruding section that forms a protrusion. The socket bottom wall comprises a first bottom wall section that extends laterally with respect to the first plane and the second plane, from which the first connector pin protrudes, and a second bottom wall section that extends laterally with respect to the first plane and the second plane, from which the second connector pin protrudes. A third plane is perpendicular to the first plane and the second plane. The first bottom wall section and the second bottom wall section may extend in the third plane. The third peripheral wall section may have a radius of curvature. More specifically, the intersection line of the third peripheral wall section and the third plane has a curvature line having a radius of curvature. The ratio of the radius of curvature to the pin distance is at most 0.35, or at most 0.33, or at most 0.31. The radius of curvature of the third peripheral wall section may be the radius of curvature measured on the part of the third peripheral wall section closest to the third plane (e.g., located within the third plane).

[0020] In a device, the radius of curvature of the third circumferential wall section (which may be the same as the radius of curvature of the fourth circumferential wall section) is a quantitative indicator of the socket height measured perpendicular to the first plane. By maintaining the ratio of the radius of curvature to the pin pitch at a maximum of 0.35, the risk of electrical creep can be reduced. The electrical creep resistance is increased by spacing the connector pins by a pin pitch that is sufficiently long compared to the radius of curvature, and the ratio of the radius of curvature to the pin pitch is at most 0.35, or at most 0.33, or at most 0.31. This fairly long pin pitch for reducing the risk of electrical creep is combined with a fairly small radius of curvature of the fourth (and preferably the third) circumferential wall, enabling a very small plug and socket design despite this pin pitch. Thus, the plug and socket are fairly wide in the direction of the pin pitch but narrow in the direction orthogonal thereto.

[0021] The device may be a personal care device or other household device. Providing improved resistance to the adverse effects of residual moisture is particularly important for such devices.

[0022] The device may be a personal care device that is a hair removal, cutting, or trimming device (such as a shaver, body groomer, hair removal device, etc.). Providing improved resistance to the adverse effects of residual moisture is particularly important for such devices.

[0023] The device may be a personal care device that is an oral care device (such as a toothbrush, tongue cleaning device, or dental shower device). Providing improved resistance to the adverse effects of residual moisture is particularly important for such devices.

[0024] The third circumferential wall section may include a first arc centered on a first central axis that extends over a first angle of at least 210° or at least 220°. Alternatively or additionally, the fourth circumferential wall section may include a second arc centered on a second central axis that extends over a second angle of at least 210° or at least 220°.

[0025] The third circumferential wall section may be shaped as a frustoconical arc or a cylindrical section (as viewed from the inside) that extends over an angle of at least 210° or at least 220° around the first central axis.

[0026] The fourth circumferential wall section may be shaped as a frustoconical arc or a cylindrical section (as viewed from the inside) that extends over an angle of at least 210° or at least 220° around the second central axis.

[0027] The socket may have a socket width measured along a first plane (e.g., as the distance between points located on the third circumferential wall section and the fourth circumferential wall section and on the first plane). The ratio of the pin distance to the socket width may be at least 0.60, at least 0.61, or at least 0.62. In a socket having such a configuration, the pins are spaced farther apart compared to conventional connector configurations, thereby further reducing the risk of creep current.

[0028] The first plane and the third plane may intersect the socket wall at a first intersection point. The first plane and the third plane may further intersect the socket wall at a second intersection point. The socket width may be the distance between the first intersection point and the second intersection point, and the ratio of the pin distance to the socket width may be at least 0.60, at least 0.61, or at least 0.62. In a socket having such a configuration, the pins are spaced farther apart compared to conventional connector configurations, thereby further reducing the risk of creep current.

[0029] The socket may be parallel to the second plane and have a socket height measured along a plane passing through the first central axis (e.g., the distance between a point located on the first peripheral wall section and the second peripheral wall section and a point located on a plane parallel to the second plane and passing through the first central axis). The ratio of the socket height to the socket width may be at most 0.60, at most 0.55, at most 0.50, at most 0.45, or at most 0.40. Alternatively or additionally, the ratio of the socket height to the pin distance may be at most 0.80, at most 0.75, at most 0.70, at most 0.65, at most 0.60, at most 0.55, at most 0.50, at most 0.45, or at most 0.40. When the socket has such a configuration, the height of the socket is relatively low compared to a conventional female connector. This further reduces the risk of creep current and allows the screw head or bolt head to separate from the socket and be positioned adjacent thereto.

[0030] Each of the third peripheral wall section and the fourth peripheral wall section may have a radius of curvature. More specifically, the intersection line of the third peripheral wall section and the fourth peripheral wall section and the third plane has a curvature line having a radius of curvature. One or several of the following may apply. The ratio of the radius of curvature to the socket width may be at most 0.20, and the ratio of the radius of curvature to the pin distance may be at most 0.35, or at most 0.33, or at most 0.31. When the socket has such a configuration, the socket height (which is approximately twice the radius of curvature of the third peripheral wall section and the fourth peripheral wall section) is relatively low compared to a conventional female connector. This further reduces the risk of creep current and allows the screw head or bolt head to separate from the socket and be positioned adjacent thereto.

[0031] The socket bottom wall may extend between the first bottom wall section and the second bottom wall section and be provided with ribs that project with respect to the first bottom wall section and the second bottom wall section to separate the first bottom wall section and the second bottom wall section.

[0032] In the device, the rib on the bottom wall reduces the electric creep current passing through the moisture that can remain in the socket. As the creep distance increases, the electrical resistance increases and the current decreases. The protrusion functions to prevent the insertion of the plug of the power device with reverse polarity. The protrusion also reduces the risk of the device being used in relation to a power device having an Ingress Protection Class (IPC) that does not match the Ingress Protection (IP) class of the device, and / or a power device not intended to be used on or with the device.

[0033] The rib may extend continuously from the first circumferential wall section to the second circumferential wall section. Thereby, the electric creepage is further reduced.

[0034] The rib may have a vertex line in the second plane. The electric creepage is further reduced by a rib where the vertex (i.e., the position where the peak of the rib protrudes the maximum distance from the first bottom section and the second bottom section) is in the middle between the first pin and the second pin.

[0035] The first circumferential wall section may have a shape different from that of the second circumferential wall section. Thereby, protection against the insertion of a plug with reverse polarity is achieved.

[0036] The first circumferential wall section may be planar. Thereby, manufacturing becomes easy and the insertion of the plug becomes easy.

[0037] A protrusion may be provided on the second circumferential wall section. The main part of the protrusion has a curved shape.

[0038] The protruding portion may have a protruding width measured along the width direction of the socket (e.g., in a third plane). The ratio of the protruding width to the socket width may be at least 0.60, or at least 0.61. When the socket has such a configuration, the protruding width is relatively wide compared to a conventional female connector. This further reduces the risk of electrical creep current by increasing the distance that the creep current has to pass through the constriction, and enables the screw head or bolt head to be separated from the socket and positioned adjacent to the socket.

[0039] The second central axis may be offset from the first central axis along the width direction of the socket. The protruding section may have a protruding width measured along the width direction. The protruding width may be determined as the distance along the width direction between a first protruding section end and a second protruding section end, at which the second circumferential wall section begins to curve inwards with respect to a plane connecting the ends of the third circumferential wall section and the ends of the fourth circumferential wall section. When the protruding width varies, the term "protruding width" shall refer to the widest measurable width. (By way of example, the protruding width may be obtained by determining the curve of the intersection line of the second circumferential wall section and the third plane, determining the end of the protruding section as the outermost point of a section on this intersection line curve that is separated from the first plane by a distance less than the maximum distance such that the curve of the intersection line is determined by the ends of the third circumferential wall section and the ends of the fourth circumferential wall section, and determining the protruding width as the distance between these outermost points defining the protruding width). The ratio of the protruding width to the socket width may be at least 0.60, or at least 0.61. When the socket has such a configuration, the protruding width is relatively wide compared to a conventional female connector. This further reduces the risk of electrical creep current by increasing the distance that the creep current has to pass through the constriction, and enables the screw head or bolt head to be separated from the socket and positioned adjacent to the socket.

[0040] The personal care device may further include a screw head or a bolt head that can be exposed on the surface of the housing. The housing may include a recess in which the screw head or the bolt head can be disposed.

[0041] The recess may be separated from the socket. The configuration of the socket enables the recess for the screw head or the bolt head to be positioned outside the socket. Since there is a separation wall between the screw and the socket, there can be no creep current between the first connector pin and the second connector pin via the screw head or the bolt head, further reducing the electrical creep current.

[0042] The housing may include a separation wall disposed between the socket and the recess in which the screw head or the bolt head is disposed.

[0043] The separation wall may have an outer end that defines a peripheral rim of the socket.

[0044] The interconnecting plane may interconnect the ends of the third peripheral wall section and the fourth peripheral wall section that connect to the second peripheral wall section. The interconnecting surface may intersect the recess. This configuration enables the recess in which the screw head or the bolt head is disposed to project within the region where the protrusion projects towards the first peripheral wall section of the socket. This configuration enables the screw head or the bolt head to be disposed outside the socket by making sufficient area available for the screw or bolt adjacent to the socket, and since there can be no creep current between the first connector pin and the second connector pin via the screw head or the bolt head, the electrical creep current is also reduced.

[0045] The fourth peripheral wall section may have a radius of curvature equal to the radius of curvature of the third peripheral wall section.

[0046] The ratio of the radius of curvature to the pin pitch may be at most 0.35, or at most 0.33, or at most 0.31.

[0047] The device may further include a power component connected to the first connector pin and the second connector pin.

[0048] The power component may be designed to operate when the power supply voltage between the first connector pin and the second connector pin is in the range of 2 to 18V, or 4 to 12V, or a low voltage of 5V. For example, the compatibility of the device with the voltage provided by a USB-type charging device is thereby promoted, providing a device connector platform that is useful for integration with charging devices operating at low voltage levels (such as 2 to 18V, 4 to 12V, or 5V).

[0049] The power component may include a battery.

[0050] The power component may include an electromechanical actuator.

[0051] The protrusion of the device may have a protrusion geometry selected from a set of protrusion geometries, each of which is associated with a different IP rating.

[0052] When the plug notch geometry is assigned an IP rating equal to the IP rating of the device, the socket's protrusion geometry may enable a plug having the plug notch geometry to be inserted into the socket. When the plug notch geometry is assigned an IP rating greater than the IP rating of the device, the socket's protrusion geometry may further enable a plug having the plug notch geometry to be inserted into the socket.

[0053] The first connector pin may have a diameter measured perpendicular to the first central axis, and this diameter varies along the first central axis to enable the first connector pin to be snap-fitted into the connector sleeve of the male connector.

[0054] The device according to a further embodiment comprises a housing having a socket for inserting a plug, a first connector pin, and a second connector pin. At least a part of the first connector pin and at least a part of the second connector pin extend into the socket. The first connector pin has a first central axis. The second connector pin has a second central axis. The first central axis and the second central axis are spaced apart by a pin distance. The first central axis and the second central axis define a first plane. A second plane is perpendicular to the first plane and extends parallel to the first central axis and the second central axis and is equally spaced from the first central axis and the second central axis. The socket comprises a socket peripheral wall and a socket bottom wall. The socket peripheral wall includes a first peripheral wall section, a second peripheral wall section, a third peripheral wall section that curves and intersects the first plane and interconnects the first wall section and the second wall section, and a fourth peripheral wall section that curves and intersects the first plane and interconnects the first wall section and the second wall section. The first peripheral wall section and the second peripheral wall section are disposed on both sides of the first plane. The third peripheral wall section and the fourth peripheral wall section are disposed on both sides of the second plane. The second peripheral wall section includes a protruding section that forms a protrusion.

[0055] The socket may have a socket width (e.g., as the distance between points located on the third peripheral wall section and the fourth peripheral wall section and on the first plane) measured along the first plane. The ratio of the pin distance to the socket width may be at least 0.60, at least 0.61, or at least 0.62. The spacing between the pins reduces the risk of creep current.

[0056] The third plane may be perpendicular to the first plane and the second plane. The third plane may include at least a part of the bottom wall therein or may be parallel to the bottom wall.

[0057] The first plane and the third plane may intersect the socket wall at the first intersection point. The first plane and the third plane may further intersect the socket wall at the second intersection point. The socket width may be the distance between the first intersection point and the second intersection point, and the ratio of the pin distance to the socket width may be at least 0.60, at least 0.61, or at least 0.62. The spacing between the pins reduces the risk of creep current.

[0058] The device, particularly its female connector, may have any one of the above-described additional features.

[0059] The device may be a personal care device or other household device.

[0060] The power plug for a machine includes a first connector sleeve and a second connector sleeve. The first connector sleeve has a first sleeve central axis. The second connector sleeve has a second sleeve central axis. The first sleeve central axis and the second sleeve central axis are spaced apart by a sleeve distance. The first sleeve central axis and the second sleeve central axis define a first plane. A second plane is perpendicular to the first plane, extends parallel to the first sleeve central axis and the second sleeve central axis, and is equally spaced from the first sleeve central axis and the second sleeve central axis. The power plug further includes an end face on which a first pin insertion opening and a second pin insertion opening are disposed, and a circumferential connector wall extending from around the end face. The circumferential connector wall includes a first circumferential connector wall section, a second circumferential connector wall section, which is curved, intersects the first plane, and interconnects the first circumferential connector wall section and the second circumferential connector wall section, a third circumferential connector wall section, which is curved, intersects the first plane, and interconnects the first circumferential connector wall section and the second circumferential connector wall section, and a fourth circumferential connector wall section, which is curved, intersects the first plane, and interconnects the first circumferential connector wall section and the second circumferential connector wall section. The first circumferential connector wall section and the second circumferential connector wall section are disposed on both sides of the first plane. The third circumferential connector wall section and the fourth circumferential connector wall section are disposed on both sides of the second plane. The second circumferential connector wall section includes a connector notch section that forms a connector notch. The end face includes a first end face section that extends transversely to the first plane and the second plane. The first connector sleeve projects from the first end face portion. The end face includes a second end face section that extends transversely to the first plane and the second plane. A third plane is perpendicular to the first plane and the second plane. The first end face section and the second end face section may extend in the third plane. The third circumferential connector wall section may have a radius of curvature. The ratio of the radius of curvature to the sleeve distance may be at most 0.35. The radius of curvature of the third circumferential connector wall section may be the radius of curvature measured on the portion of the third circumferential connector wall section closest to (e.g., located in) the third plane.

[0061] A power plug having such a configuration provides a long sleeve distance as compared to the connector height (measured laterally with respect to the first plane). The long sleeve distance as compared to the connector height reduces the risk of electric creep current. The short connector height as compared to the sleeve distance reduces the amount of liquid that can be introduced into the female connector during use, which also reduces the risk of electric creepage.

[0062] The notch functions to prevent reverse-polarity insertion into the socket of the device. The notch also reduces the risk of being used in association with a device having an ingress protection (IP) class (IPC) that does not match that of the power device equipped with the power plug, and / or a device that is not intended to be used on or with the power device equipped with the power plug.

[0063] The end face may include a groove disposed between a first end face section and a second end face section.

[0064] The groove may function to drain water.

[0065] In the power plug, the groove can further help remove residual moisture.

[0066] The end face may extend laterally with respect to the first plane.

[0067] The first end face section may include a first annular region that crosses the first plane, particularly perpendicular to the first plane.

[0068] The second end face section may include a second annular region that crosses the first plane, particularly perpendicular to the first plane.

[0069] The groove may be recessed as compared to the plane in which the first annular region and the second annular region extend.

[0070] The groove may include a first inclined portion extending from the first annular region and a second inclined portion extending from the second annular region. The first inclined portion and the second inclined portion are each recessed deeper from the plane in which the first annular region and the second annular region extend as the distance from the first annular region and the second annular region increases.

[0071] The groove may be formed by a V-shaped or U-shaped recess in the end face.

[0072] Such a configuration facilitates the discharge of residual liquid.

[0073] The intersection line of the end face and the first plane may define a concave shape, and the end face is lower when it is closer to the second plane than when it is further away from the second plane (i.e., further away from the plane defined by the first pin insertion opening and the second pin insertion opening).

[0074] The intersection line of the end face and the second plane may define a convex shape, and the end face is lower when it is closer to the first plane than when it is further away from the first plane (i.e., further away from the plane defined by the first pin insertion opening and the second pin insertion opening).

[0075] Such a configuration facilitates the discharge of residual liquid.

[0076] The power plug may be operable to engage with a personal care device or other household device. Providing improved resistance to the adverse effects of residual moisture is particularly important for such devices.

[0077] The power plug may be operable to engage with a personal care device that is a hair removal, cutting, or trimming device (such as a shaver, body groomer, hair removal device, etc.). Providing improved resistance to the adverse effects of residual moisture is particularly important for such devices.

[0078] The power plug may be operable to engage with a personal care device that is an oral care device (such as a toothbrush, a tongue cleaning device, or a dental shower device). Providing improved resistance to the adverse effects of residual moisture is particularly important for such a device.

[0079] The third circumferential connector wall section may include a first arc centered on a first central axis that extends over a first angle of at least 210° or at least 220°.

[0080] The fourth circumferential connector wall section may include a second arc centered on a second central axis that extends over a second angle of at least 210° or at least 220°.

[0081] The third circumferential connector wall section may be shaped as a frustoconical arc or a cylindrical section that extends over an angle of at least 210° or at least 220° about the first central axis.

[0082] The fourth circumferential connector wall section may be shaped as a frustoconical arc or a cylindrical section that extends over an angle of at least 210° or at least 220° about the second central axis.

[0083] The power plug may have a plug connector width measured along a first plane (e.g., as the distance between points located on the third circumferential connector wall section and on the fourth circumferential connector wall section and on the first plane). The ratio of the sleeve distance to the plug connector width may be at least 0.59, at least 0.60, at least 0.61, or at least 0.62. In a power plug having such a configuration, the sleeve is spaced farther apart compared to conventional connector configurations, thereby reducing the risk of creep current during use of the power plug.

[0084] The first plane and the third plane may intersect the circumferential connector wall at the first intersection, and the first plane and the third plane intersect the circumferential connector wall at the second intersection. The plug connector width may be the distance between the first intersection and the second intersection. The ratio of the sleeve distance to the plug connector width may be at least 0.50, at least 0.55, at least 0.60, or at least 0.62. In a power plug having such a configuration, the sleeve is spaced farther apart compared to conventional connector configurations, thereby reducing the risk of creep current during use of the power plug.

[0085] The groove may extend continuously between the first circumferential connector wall section and the second circumferential connector wall section.

[0086] The groove may extend continuously from the first circumferential connector wall section to the second circumferential connector wall section.

[0087] The power plug may have a plug connector height (e.g., the distance between a point located on the first circumferential connector wall section and the second circumferential connector wall section and a point located on a plane parallel to the second plane and passing through the first central axis) measured along a plane parallel to the second plane and passing through the first central axis. The ratio of the plug connector height to the plug connector width may be at most 0.60, at most 0.55, at most 0.50, at most 0.45, or at most 0.40. Alternatively or additionally, the ratio of the plug connector height to the sleeve distance may be at most 0.60, at most 0.55, at most 0.50, at most 0.45, or at most 0.40. When the power plug has such a configuration, the height of the plug connector is relatively low compared to a conventional male connector. This further reduces the risk of residual liquid that can be introduced into the socket of the device during use.

[0088] The intersection line of the third circumferential connector wall section and the fourth circumferential connector wall section with the third plane may have a radius of curvature. More specifically, the intersection line of the third circumferential wall section and the fourth circumferential wall section with the third plane has a curvature line with a radius of curvature. The ratio of the radius of curvature to the plug connector width may be at most 0.20. When the plug has such a configuration, the plug height (which is approximately twice the radius of curvature of the third circumferential connector wall section and the fourth circumferential connector wall section) is relatively low compared to a conventional male connector. This further reduces the risk of residual liquid that can be introduced into the socket of the device during use.

[0089] The first circumferential connector wall section may have a shape different from that of the second circumferential connector wall section. Thereby, protection against the insertion of a plug of reverse polarity is achieved.

[0090] The first circumferential connector wall section may be planar. This facilitates manufacturing and the insertion of the plug.

[0091] The notch may have a notch width measured along the width direction of the plug connector (for example, in the third plane). One or several of the following may apply. The ratio of the notch width to the plug connector width may be at least 0.60 or at least 0.61, and the ratio of the notch width to the sleeve distance may be at least 0.50, at least 0.55, at least 0.60, at least 0.65, at least 0.70, at least 0.75, at least 0.80, at least 0.85, at least 0.90, or at least 0.95. When the connector has such a configuration, the notch width is relatively wide compared to a conventional male connector. This also helps to reduce the risk of residual moisture being introduced into the device socket.

[0092] The second central axis may be offset from the first central axis along the width direction of the power plug connector. The notch section may have a notch width measured along the width direction. The notch width may be determined as the distance along the width direction between a first notch section end and a second notch section end where the second circumferential connector wall section begins to curve inward with respect to a plane interconnecting the ends of the third circumferential connector wall section and the ends of the fourth circumferential connector wall section. (By way of example, the notch width may be obtained by determining the curve of the intersection line of the second circumferential connector wall section and the third plane, and determining the end of the notch section as the outermost point of the section on this intersection line curve that is spaced from the first plane by a distance less than the maximum distance such that the curve of the intersection line is determined by the ends of the third circumferential connector wall section and the ends of the fourth circumferential connector wall section, and determining the notch width as the distance between these outermost points defining the notch width). One or several of the following may apply. The ratio of the notch width to the plug connector width may be at least 0.60 or at least 0.61, and the ratio of the notch width to the sleeve distance may be at least 0.50, at least 0.55, at least 0.60, at least 0.65, at least 0.70, at least 0.75, at least 0.80, at least 0.85, at least 0.90, or at least 0.95. When the socket has such a configuration, the notch width is relatively wide compared to a conventional male connector. This further reduces the risk of electrical creep current by increasing the distance between pins that can engage with the connector sleeve.

[0093] The notch height may be measured by determining the intersection line of the notch section and the third plane, determining the maximum distance and the minimum distance of this intersection line from the intersection line where the third plane intersects the first circumferential connector wall section, and determining the notch height as the difference between the maximum distance and the minimum distance.

[0094] The power plug may be operable to supply power in the range of 2 - 18V, or 4 - 12V, or at a low voltage of 5V. For example, the compatibility of the power plug with the voltage provided by a USB - type charging device is thereby promoted, providing a platform for device connectors that is useful for integration with charging devices operating at such voltage levels.

[0095] The fourth circumferential connector wall section may have a radius of curvature equal to the radius of curvature of the third circumferential connector wall section.

[0096] The ratio of the radius of curvature to the sleeve distance may be at most 0.35 or at most 0.33.

[0097] The notches of the power plug may have a notch geometry selected from a set of notch geometries each associated with a different IP rating.

[0098] When the socket protrusion geometry is assigned an IP rating equal to the IP rating of the power plug, the notch geometry of the plug allows the plug to be inserted into a device having the socket protrusion geometry. When the socket protrusion geometry is assigned an IP rating lower than the IP rating of the power plug, the notch geometry of the plug allows the plug to be inserted into a device having the socket protrusion geometry.

[0099] The power plug may include a first plastic component including a circumferential connector wall and an end face. The power plug may further include a second plastic component connected to an end of the first plastic component, which may be on the opposite side of the end face, the second plastic component being formed from a second plastic material, the first plastic material having a first hardness and the second plastic material having a second hardness different from the first hardness. This makes it possible to form components required to reduce the risk of reverse polarity insertion of the power plug from a harder material, while making it possible to form components that may need to bend and deflect during use from a softer material.

[0100] A power plug according to another embodiment includes a first connector sleeve and a second connector sleeve. The first connector sleeve has a first sleeve central axis. The second connector sleeve has a second sleeve central axis. The first sleeve central axis and the second sleeve central axis are spaced apart by a sleeve distance. The first sleeve central axis and the second sleeve central axis define a first plane. A second plane is perpendicular to the first plane, extends parallel to the first sleeve central axis and the second sleeve central axis, and is equally spaced from the first sleeve central axis and the second sleeve central axis. The power plug further includes an end face on which a first pin insertion opening and a second pin insertion opening are disposed, and a circumferential connector wall extending from around the end face. The circumferential connector wall includes a first circumferential connector wall section, a second circumferential connector wall section, which is curved, intersects the first plane, and interconnects the first circumferential connector wall section and the second circumferential connector wall section, a third circumferential connector wall section, which is curved, intersects the first plane, and interconnects the first circumferential connector wall section and the second circumferential connector wall section, and a fourth circumferential connector wall section, which is curved, intersects the first plane, and interconnects the first circumferential connector wall section and the second circumferential connector wall section. The first circumferential connector wall section and the second circumferential connector wall section are disposed on both sides of the first plane. The third circumferential connector wall section and the fourth circumferential connector wall section are disposed on both sides of the second plane. The second circumferential connector wall section includes a connector notch section that forms a connector notch. The end face includes a first end face section that extends laterally with respect to the first plane and the second plane. The first connector sleeve protrudes from the first end face portion. The end face includes a second end face section that extends laterally with respect to the first plane and the second plane.

[0101] The power plug may have a plug connector width measured along a first plane (e.g., as the distance between points located on a third circumferential connector wall section and on a fourth circumferential connector wall section and on the first plane). The ratio of the sleeve distance to the plug connector width may be at least 0.59, at least 0.60, at least 0.61, or at least 0.62. The spacing of the sleeves reduces the risk of creep current during use of the power plug.

[0102] The first plane and the third plane may intersect the circumferential connector wall at a first intersection, and the first plane and the third plane intersect the circumferential connector wall at a second intersection. The plug connector width may be the distance between the first intersection and the second intersection. The ratio of the sleeve distance to the plug connector width may be at least 0.59, at least 0.60, at least 0.61, or at least 0.62. The spacing of the sleeves reduces the risk of creep current during use of the power plug.

[0103] The power plug, in particular its plug connector, may have any one of the additional features described above.

[0104] The power plug may be a power plug for a personal care device or other household device.

[0105] The first connector sleeve may be a first slotted sleeve operable to snap onto a first connector pin of the male connector.

[0106] The second connector sleeve may be a second slotted sleeve operable to snap onto a second connector pin of the male connector.

[0107] A power device according to one embodiment comprises a power plug according to one embodiment. The power device is operable to reduce the risk of reverse polarity engagement between the power plug and the device. The power device is operable to mitigate the risk of electrical creep current.

[0108] The power device may include a converter. The power device may be operable to perform voltage down conversion. Thereby, the personal care device can be powered using a power device engageable with an electrical outlet.

[0109] The power device may be configured as a power cord.

[0110] The power device may include a stand that functions to support a device (such as a personal care device) received thereon.

[0111] A kit according to one embodiment includes a personal care device of one embodiment and a power device including a power plug of one embodiment, and the power device is operable to supply power to the personal care device.

[0112] The socket and the power plug may be configured such that when the power plug is operably engaged with the socket, the socket peripheral wall is spaced from the circumferential connector wall by a gap. This further reduces the risk of adverse effects that may be caused by electrical creep current.

[0113] The third peripheral wall section may have a frustoconical or cylindrical section shape extending over a first arc angle, or may be a frustoconical or cylindrical section shape extending over a first arc angle.

[0114] The third circumferential connector wall section may have another frustoconical or cylindrical section shape extending over a second arc angle, or may be another frustoconical or cylindrical section shape extending over a second arc angle.

[0115] The second arc angle may be different from the first arc angle.

[0116] A kit according to one embodiment comprises a first personal care device having a first housing with a first socket, the first socket having a first socket geometry selected from a set of two or more different socket geometries, each assigned to a different one of several Ingress Protection (IP) ratings, the first socket geometry being assigned to a first IP rating, the first personal care device, and a power device comprising a power plug, the power plug having a plug geometry selected from a set of two or more different plug geometries, each assigned to a different one of two or more IP ratings.

[0117] The kit may be operable to encode the IP rating in its socket geometry to prevent insertion of a plug that is not compatible with the IP rating of the device.

[0118] The first socket may be shaped to allow insertion of the power plug when the plug geometry is assigned to an IP rating equal to the first IP rating, allow insertion of the power plug when the plug geometry is assigned to an IP rating higher than the first IP rating, and prevent insertion of the power plug when the plug geometry is assigned to an IP rating lower than the first IP rating.

[0119] Accordingly, the first socket may be operable to encode the IP rating in its first socket geometry to prevent insertion of a plug that is not compatible with the IP rating of the device.

[0120] The power device may be a first power device, and the power plug may be a first power plug having a first plug geometry assigned to the first IP rating.

[0121] The kit may further comprise a second power device having a second power plug, the second power plug having a second plug geometry selected from a set of two or more different plug geometries, the second plug geometry being assigned a second IP rating that is higher than the first IP rating.

[0122] The first socket may be shaped to allow insertion of the first power plug and to allow insertion of the second power plug.

[0123] Thus, the first socket geometry may ensure that the device can be used in connection with a power device designed to have at least the same IP rating as the device.

[0124] The kit may further include a second personal care device having a second housing with a second socket, the second socket having a second socket geometry selected from a set of two or more different socket geometries, the second socket geometry being assigned a second IP rating.

[0125] The second socket may be shaped to prevent insertion of the first power plug and to allow insertion of the second power plug.

[0126] Thus, the second socket geometry may ensure that the device cannot be used in connection with a power device designed to have a lower IP rating than the device.

[0127] The first personal care device may be a first personal care device according to one embodiment, and / or the power plug may be a power plug according to one embodiment.

[0128] The method according to one embodiment is performed using a first personal care device comprising a first housing having a first socket, the first socket having a first socket geometry selected from a set of two or more different socket geometries each assigned to a different one of several Ingress Protection (IP) ratings. The method includes using a protrusion of the first socket geometry to selectively enable insertion of a power plug and selectively prevent insertion of other power plugs, depending on the IP rating of the power plug.

[0129] The first socket geometry may be assigned to a first IP rating.

[0130] The method may further use a power device comprising a power plug, the power plug having a plug geometry selected from a set of two or more different plug geometries each assigned to a different one of two or more IP ratings. The method may include enabling insertion of the power plug into the socket by the protrusion when the power plug is assigned an IP rating compatible with the IP rating of the device. The method may include preventing insertion of the power plug into the socket by the protrusion when the power plug is assigned an IP rating compatible with the IP rating of the device.

[0131] The method may include encoding the IP rating in the socket geometry to prevent insertion of a plug that is not compatible with the IP rating of the device.

[0132] The first socket may be shaped to allow insertion of a power plug when the plug geometry is assigned an IP rating equal to the first IP rating, allow insertion of a power plug when the plug geometry is assigned an IP rating higher than the first IP rating, and prevent insertion of a power plug when the plug geometry is assigned an IP rating lower than the first IP rating.

[0133] Thus, the socket may be operable to encode the IP rating in its first socket geometry, preventing the insertion of a plug that is not compatible with the IP rating of the device.

[0134] The power device may be a first power device, and the power plug may be a first power plug having a first plug geometry assigned to a first IP rating.

[0135] The method may further include using a second power device having a second power plug, the second power plug having a second plug geometry selected from a set of two or more different plug geometries, the second plug geometry being assigned to a second IP rating that is higher than the first IP rating.

[0136] The method may include enabling the insertion of the first power plug and the insertion of the second power plug by the first socket.

[0137] Thus, the socket geometry may ensure that the device can be used in association with a power device designed to have at least the same IP rating as the device.

[0138] The method may include using a second personal care device having a second housing with a second socket, the second socket having a second socket geometry selected from a set of two or more different socket geometries, the second socket geometry being assigned to a second IP rating.

[0139] The second socket may be shaped to prevent the insertion of the first power plug and allow the insertion of the second power plug.

[0140] Thus, the socket geometry may ensure that the device cannot be used in association with a power device designed to have a lower IP rating than the device.

[0141] The first personal care device may be the first personal care device according to one embodiment, and / or the power plug may be the power plug according to one embodiment.

[0142] The method may be a method of using protrusions and / or notch geometries to enforce a match of the IP ratings of the power device and the device.

[0143] Advantageously, the kit includes a first personal care device comprising a first housing having a first socket, the first socket having a first socket geometry, a second personal care device comprising a second housing having a second socket, the second socket having a second socket geometry, wherein the second housing is provided more watertightly than the first housing, the first power device comprises a first power housing and a first power plug, the first power plug having a first plug geometry, the second power device comprises a second power housing and a second power plug, the second power plug having a second plug geometry, the second power housing being provided more watertightly than the first power housing, the first plug geometry being provided to fit into the first socket but not into the second socket, and the second plug geometry being provided to fit into both the first socket and the second socket. This ensures that the user can only electrically connect personal care devices that have a waterproofness equal to or greater than that of the plug of the power device.

[0144] Furthermore, the first plug geometry has a first connection surface provided for connection to the first socket and is wider than a second connection surface of the second plug geometry provided for connection to the second socket. These connection surfaces are covered by their respective sockets when their respective mating plugs are inserted into the sockets.

[0145] Furthermore, the first plug geometry is provided with a first lateral notch, the second plug geometry is provided with a second lateral notch, and the second lateral notch is deeper than the first lateral notch. Thus, the outer geometries of different plug types differ with respect to the depth of the lateral notch. The deeper notch also increases the contact surface of the plug. More advantageously, the set includes at least a third device e and a power device. This kit is a third personal care device comprising a third housing having a third socket, the third socket having a third socket geometry, the second housing and the first housing being provided more watertightly than the third housing, a third personal care device, and a third power device comprising a third power housing and a third power plug, the third power plug having a third plug geometry, the second power housing and the first power housing being provided more watertightly than the first power housing, a third power device, wherein the first plug geometry and the second plug geometry are provided to fit into the third socket, and the third plug geometry is provided not to fit into either the first socket or the second socket.

[0146] The first power device and the second power device are of the switch-mode power type that converts the main power voltage to a lower device voltage, and / or the first personal care device and the second personal care device are one of an electric toothbrush, a shaver, a charging device, a cleaning station, or a hair remover.

[0147] Figure 1 shows kit 10. Kit 10 includes one or several personal care devices and one or several power devices. Figure 1 shows kit 10 including shaver 11, toothbrush 12, and first power device, second power device, and third power device 40. The first devices 11, 12, and the first power device 40, and their respective housings support a specific first IP waterproof standard and can be sealed against water accordingly. The second devices 11, 12, and the second power device 40, and their respective housings support a specific second IP waterproof standard and can be sealed against water accordingly. The third devices 11, 12, and the third power device 40, and their respective housings support a specific third IP waterproof standard and can be sealed against water accordingly. The IP standard of the third kit formed in this way may be the lowest. The IP standard of the second kit formed in this way may be the highest. The second kit has an IP standard between the first kit and the second kit.

[0148] Devices 11, 12 may be personal care devices. Devices 11, 12 may each be selected from the group including devices for hair removal, cutting, or trimming (such as shavers, body groomers, etc.) and oral care devices (such as toothbrushes, oral showers, tongue cleaners, etc.). Each personal care device 11, 12 may have housings 20, 30 respectively. Housings 20, 30 may each be provided with a connector. The connector may be configured as a female connector. The connector may include sockets 21, 31 and at least two electrical contacts (such as pins) that can at least partially extend into the socket.

[0149] The power supply device 40 may include a power plug 43 that is operable to engage with at least one connector of the devices 11, 12. The power plug 43 may be a male connector. The power plug 43 may include a connector that is operable to be inserted into the sockets 21, 31. The power plug may include at least two electrical contacts (such as sleeves) that are operable to conductively contact electrical contacts extending into the sockets 21, 31, provided that the sockets 21, 31 allow insertion of their respective plugs 43.

[0150] The power supply device 40 may be a power cord having a connector 41 that engages with a power outlet at one end and a power plug 43 at the other end. A cable 42 having two or more conductors may extend to the power plug 43. The power supply device 40 may include at least one converter that is operable to perform voltage down-conversion. The converter may be operable to convert a grid voltage of, for example, 110V or 230V to a lower power supply voltage, such as a low voltage in the range of 2 - 18V, 4 - 12V, or a voltage of 5V or 12V.

[0151] Alternatively or additionally, the power supply device 40 may include a stand on which the devices 11, 12 can be received. The power plug 43 may be disposed on the stand or integrated with the stand such that the power plug 43 can supply power to the device positioned on the stand.

[0152] The geometric features of the connectors of the devices and / or the power plugs that can be inserted into them will be described in more detail below with reference to FIGS. 2 - 24.

[0153] The connectors of the devices and / or the power supply device may be designed to provide any one or any combination of various effects.

[0154] The connectors of the machine and / or the power device may be designed to reduce the risk of electrical creep current. This increases the device lifespan. This may be achieved using various techniques, which may be used alone or in combination, including increasing the electrical creep distance and / or providing geometric features that reduce the risk of water accumulation within the socket of the device.

[0155] Alternatively or additionally, the connectors of the machine and / or the power device may be designed to provide a platform for combining the machine and the power device. The geometric features of the connectors of the machine and / or the power device may be implemented such that the male connector geometry may be operable for engagement with several female connector geometries. Different male connector geometries may be associated with specific power device characteristics (such as different Ingress Protection (IP) classes (IPCs)). Different female connector geometries may be associated with specific device characteristics (such as different Ingress Protection (IP) classes (IPCs)). The geometry may be implemented such that at least one male connector type is insertable into each of the female connector types, and / or at least one other male connector type is insertable into at least one female connector type, but is prevented from being inserted into at least another female connector type, and / or at least yet another male connector type is insertable only into one female connector type, but is prevented from being inserted into at least another female connector type. The platform provides versatility in the sense that, for example, a power plug of a power device having a high IPC may be used not only with devices having the same IPC, but also with devices having a lower IPC.

[0156] The different connector geometries (both male and female) may be implemented by protrusions and / or notches of various sizes, shapes, and / or positions.

[0157] The protrusions and / or notches may also prevent undesirable reverse polarity mating of the male and female connectors that may adversely affect the device.

[0158] Figures 2 and 3 are detailed views of the device and the power plug, respectively. Figure 2 shows an end of the housing 20 of the device with the socket 21. The socket 21 has a protrusion. Additional features that can be implemented in the socket 21 are described below. Figure 3 shows a perspective view of the power plug 43. The power plug 43 has a connector 44. The connector 44 has a notch. Additional features that can be implemented in the power plug 43 are described below.

[0159] Figures 4 and 5 show the female connector 50 of the device. The female connector has a first socket geometry. Figure 4 shows a plan view. Figure 5 shows a cross-sectional view.

[0160] The female connector 50 includes a socket 60 formed within or by the housing of the device. The socket 60 is defined by a socket bottom wall 70 and a socket peripheral wall 80.

[0161] The socket 60 has a socket cavity 63. The socket cavity 63 functions to receive a plug connector. The socket cavity 63 may function to receive a plug connector having one, two, or more than three predetermined plug connector geometries. The socket 60 has a socket insertion opening 64 through which a plug connector can be inserted into the socket cavity 63. The socket insertion opening 64 may be surrounded by a peripheral rim 62.

[0162] The socket cavity 63 may be separated by the socket bottom wall 70 and the socket peripheral wall 80, or alternatively, the socket bottom wall 70 and the socket peripheral wall 80 may be provided otherwise.

[0163] The socket bottom wall 70 may include a first bottom wall section 71 and a second bottom wall section 72. The first bottom wall section 71 and the second bottom wall section 72 may be on the same plane. The first bottom wall section 71 and the second bottom wall section 72 may extend within the socket bottom plane 103 (also referred to as the third plane 103 in this specification). The socket bottom wall 70 may further include ribs 73, which will be described in more detail below. The ribs 73 may extend from the socket bottom surface 103 towards the socket insertion opening 64.

[0164] The socket peripheral wall 80 may include a first peripheral wall section 81, a second peripheral wall section 82, a third peripheral wall section 83 that curves and intersects the first plane 101 and interconnects the first wall section 81 and the second wall section 82, and a fourth peripheral wall section 84 that curves and intersects the first plane 101 and interconnects the first wall section 81 and the second wall section 82. The socket peripheral wall may be composed of the first peripheral wall section 81 to the fourth peripheral wall section 84.

[0165] The first peripheral wall section 81 and the second peripheral wall section 82 may be arranged opposite to each other. The first peripheral wall section 81 and the second peripheral wall section 82 may be arranged on the opposing long sides of the socket (this long side is also referred to as the width direction in this specification and the relevant technical field).

[0166] The first peripheral wall section 81 and the second peripheral wall section 82 may have different shapes as will be described in more detail below. The second peripheral wall section 82 may be provided with a protrusion 61. The first peripheral wall section 81 may not be provided with a protrusion. The first peripheral wall section 81 may be planar.

[0167] The third peripheral wall section 83 and the fourth peripheral wall section 84 may be arranged to face each other. The third peripheral wall section 83 and the fourth peripheral wall section 84 may be arranged on the opposing short sides of the socket (this short side is also referred to as the height direction in this specification and in the relevant technical field). The third peripheral wall section 83 and the fourth peripheral wall section 84 may each be curved from the first peripheral wall section 81 to the second peripheral wall section 82. The intersection line between the third peripheral wall section 83 and the fourth peripheral wall section 84 and a plane (especially any plane) that is perpendicular to the first central axis 51 and intersects the third peripheral wall section 83 and the fourth peripheral wall section 84 may be an arc of an ellipse such as a semi-circular or other elliptical arc. Alternatively or additionally, the intersection line between the third peripheral wall section 83 and the fourth peripheral wall section 84 and a plane (especially any plane) that is perpendicular to the socket bottom surface 103 and intersects the third peripheral wall section 83 and the fourth peripheral wall section 84 may be a straight line. The third peripheral wall section 83 and the fourth peripheral wall section 84 may be formed as a cylindrical section or a conical section, but are not limited thereto.

[0168] The third peripheral wall section 83 may have a shape corresponding to the shape of an angular section (or arc) of a frustum-shaped surface or a cylindrical surface (when viewed from the inside). This frustum-shaped or cylindrical arc section may extend over an angle 129. The angle 129 may be at least 170°.

[0169] The fourth circumferential wall section 84 may have a shape corresponding to the shape of an angular section (or arc) of a frustum-shaped surface or a cylindrical surface (when viewed from the inside). This frustum-shaped or cylindrical arc section may extend over an angle 129. The angle 129 may be at least 170°. The angles 129 over which the third circumferential wall section 83 and the fourth circumferential wall section 84 extend may be equal to each other, but are not limited thereto. See the angles 129 of at least 210° or the angle 229 of 220° in FIGS. 4 and 6. Alternatively and in another embodiment, the corresponding angles are also at least 210° or 220° or 270° centered on the connector pins / sleeves in both FIGS. 17 and 18, and the corresponding angles are at least 210° or 220° or 228° in the embodiments of FIGS. 19 and 20 centered on at least one connector pin / sleeve.

[0170] The first circumferential wall section 81 to the fourth circumferential wall section 84 may extend from the bottom to the free end of the bottom wall portion 70. The free end may define a peripheral rim 62 surrounding the socket insertion opening 62.

[0171] The first circumferential wall section 81 may transition to the third circumferential wall section 83 along a line that may extend from the bottom in the bottom wall portion 70 to the free end in the peripheral rim 62. The intersection of this transition line and the third plane 103 is shown as point 91 in FIG. 4.

[0172] The third circumferential wall section 83 may transition to the second circumferential wall section 82 along a line that may extend from the bottom in the bottom wall portion 70 to the free end in the peripheral rim 62. The intersection of this transition line and the third plane 103 is shown as point 92 in FIG. 4.

[0173] The second circumferential wall section 82 may transition to the fourth circumferential wall section 84 along a line that may extend from the bottom in the bottom wall portion 70 to the free end in the circumferential rim 62. The intersection of this transition line and the third plane 103 is shown as point 93 in FIG. 4.

[0174] The fourth peripheral wall section 84 may transition to the first peripheral wall section 81 along a line that may extend from the bottom in the bottom wall portion 70 to the free end in the peripheral rim 62. The intersection of this transition line and the third plane 103 is shown as point 94 in FIG. 4.

[0175] The female connector 50 includes a first connector pin 51 and a second connector pin 52. At least a part of the first connector pin 51 and at least a part of the second connector pin 52 extend into the cavity 63 of the socket. The first connector pin 51 has a first central axis 53. The second connector pin 52 has a second central axis 54. The first central axis 53 and the second central axis 54 are spaced apart by a pin distance 121.

[0176] The first connector pin 51 and the second connector pin 52 are formed of a conductive material. The first connector pin 51 and the second connector pin 52 may be metal connector pins.

[0177] The first central axis 53 and the second central axis 54 may be parallel to each other. The first central axis 53 and the second central axis 54 may define a first plane 101 in which the first central axis 53 and the second central axis 54 extend.

[0178] The second plane 102 is perpendicular to the first plane 101. The second plane 102 may extend parallel to the first central axis 53 and the second central axis 54. The second plane 102 may be equidistant from the first central axis 53 and the second central axis 54.

[0179] The first peripheral wall section 81 and the second peripheral wall section 82 may be disposed on both sides with respect to the first plane 101.

[0180] The third peripheral wall section 83 and the fourth peripheral wall section 84 may be disposed on both sides with respect to the second plane 102.

[0181] The socket may have a socket width 122. The socket width may correspond to the maximum extension of the socket along the longer of the two axes of the socket as viewed in a plan view. The socket width 122 may be determined as the distance between a first intersection point 95 and a second intersection point 96 where both the first plane 101 and the third plane 103 intersect the third peripheral wall section 83 and the fourth peripheral wall section 84.

[0182] The socket may have a socket height 123. The socket height may correspond to the maximum extension of the socket along the shorter of the two axes of the socket as viewed in a plan view. The socket height 123 may be determined using any one of the following techniques. - Determining an intersection line 111 between the first peripheral wall 81 and the third plane 103, determining points 92, 93 where the intersection line between the peripheral wall and the third plane 103 has the maximum distance from the intersection line 111, and determining the distances of the points 92, 93 from the intersection line 111 as the socket height 123. - Determining an intersection line 111 between the first peripheral wall 81 and the third plane 103, determining points 92, 93 where the third peripheral wall section 83 and the fourth peripheral wall section 84 transition to the second peripheral wall section 82 on the intersection line in the third plane 103, and determining the greater of the two distances of the points 92, 93 from the intersection line 111 as the socket height 123. - Determining points 91, 92 as the intersection line between the first plane 101, a plane parallel to the second plane 102 and passing through the first central axis 53, and the circumferential socket wall 70, determining the socket height 123 as the distance between these points 91 and point 92, and - Determining points 93, 94 as the intersection line between the first plane 101, a plane parallel to the second plane 102 and passing through the second central axis 54, and the circumferential socket wall 70, determining the socket height 123 as the distance between these points 93 and point 94, and - Determining the radius of curvature 105 of the intersection line between the third peripheral wall 83 or the fourth peripheral wall 84 and the third plane, and determining the socket height as twice the radius of curvature 105.

[0183] The ratio of the radius of curvature 105 to the pin pitch 121 is at most 0.35. By maintaining the ratio of the radius of curvature to the pin pitch at most 0.35, the risk of electrical creep can be reduced. The electrical creep resistance is increased by spacing the connector pins only by a pin pitch that is sufficiently long compared to the radius of curvature, and the ratio of the radius of curvature to the pin pitch is at most 0.35, or at most 0.33, or at most 0.31.

[0184] As will be described in more detail below, the second peripheral wall section 82 may have a protruding section 85. The protruding section 85 forms a protrusion 61 within the socket 60. The protrusion 61 causes a reduction in the socket height measured along the second plane 102 as seen in a plan view (see FIG. 4). At the protrusion 61, the second peripheral wall section 82 protrudes towards the first peripheral wall section 81. By way of example, in any plane that coincides with or is parallel to the third plane 103 and intersects the peripheral wall section, the protrusion 61 may protrude towards the first peripheral wall section 81 compared to points 92, 93 on the second peripheral wall section 82 that are spaced from the first peripheral wall section 81 by a maximum distance.

[0185] The protrusion 61 causes the socket 60 to have a reduced socket height 125 at the protrusion 61. The reduced socket height 125 at the protrusion 61 may be determined by determining the intersection line 111 of the first peripheral wall 81 and the third plane 103, determining a further intersection line of the second peripheral wall 82 and the third plane 103, and determining the reduced socket height 125 at the protrusion 61 as the minimum distance measured perpendicular to the intersection line 111 from any point on the further intersection line from the intersection line 111.

[0186] The protrusion 61 has a protrusion height 126. The protrusion height 126 indicates how much the protrusion protrudes towards the first peripheral wall section 81. The protrusion height 126 may be determined as the difference between the socket height 123 and the reduced socket height 125 at the protrusion 61.

[0187] The protrusion 61 may extend from the socket bottom wall 70 to the peripheral rim 62. The protrusion 61 may continuously extend from the socket bottom wall 70 to the peripheral rim 62.

[0188] The first connector pin 51 protrudes from the first bottom wall section 71. The second connector pin 52 protrudes from the second bottom wall section 72. A rib 73 may be provided between the first bottom wall section 71 and the second bottom wall section 72. The rib 73 may protrude from at least one, preferably both, of the first bottom wall section 71 and the second bottom wall section 72. The rib 73 may protrude from the socket bottom surface 103 towards the socket insertion opening 64.

[0189] The rib 73 may extend from the first peripheral wall section 81 to the second peripheral wall section 82. The rib 73 may continuously extend from the first peripheral wall section 81 to the second peripheral wall section 82. When the rib 73 extends from the first peripheral wall section 81 to the second peripheral wall section 82 along the second plane 102, it may have a substantially constant cross-section. Alternatively, the cross-section of the rib 73 may vary and / or the rib 73 need not extend throughout the space between the first peripheral wall section 81 and the second peripheral wall section 82.

[0190] The effect of the rib 73 is to increase the electrical creep distance through any fluid that may remain within the socket 60. This increases the electrical resistance and reduces the electrical creepage. Otherwise, adverse effects such as the risk of electrolysis resulting from the electrical creep current are reduced.

[0191] The protrusion 61 may also function to provide various effects. The protrusion 61 reduces the socket height in the central region between the first connector pin 51 and the second connector pin 52, which may also contribute to an increase in the electrical creep resistance and / or a reduction in the electrical creepage. The protrusion 61 may provide protection against the insertion of the reverse polarity of the power plug. The protrusion 61 may function to define, by its geometry (such as size and position), which power plugs can be inserted into the socket 60. Thus, the protrusion 61 may enable the insertion of a power plug having characteristics (such as IP characteristics) that match the characteristics of the device into the socket, and / or may function to prevent the insertion of a power plug having characteristics (such as IP characteristics) that do not match the characteristics of the device into the socket.

[0192] The socket 60 may have geometric features that contribute to the improvement of characteristics by reducing the risk of electrical creepage and / or reducing the risk of insertion of an inappropriate power plug.

[0193] The ratio of the pin distance 121 to the socket width 122 may be at least 0.60, at least 0.61, or at least 0.62. In a socket having such a configuration, the connector pins 51, 52 are relatively far apart, thereby further reducing the risk of creep current compared to conventional connector configurations.

[0194] The ratio of the socket height 123 to the socket width 122 may be at most 0.60, at most 0.55, at most 0.50, at most 0.45, or at most 0.40. The ratio of the socket height 123 to the pin distance 121 may be at most 0.76, at most 0.70, at most 0.65, at most 0.60, at most 0.55, at most 0.50, at most 0.45, or at most 0.40. When the socket 60 has such a configuration, the risk of creep current is further reduced. As will be described later, it becomes easier to arrange a screw head or a bolt head outside adjacent to the socket 60, thereby further reducing the risk of creep current.

[0195] The ratio of the radius of curvature 105 of the third circumferential wall section 83 and / or the fourth circumferential wall section 84 to the socket width 122 may be at most 0.20. Alternatively or additionally, the ratio of the radius of curvature 105 to the pin pitch 121 may be at most 0.35 or at most 0.33. Such a configuration further reduces the risk of creep current and, as will be described later, enables the screw head or bolt head to be separated from the socket and positioned adjacent to the socket, thereby further reducing the risk of creep current.

[0196] The distance 127 between the first connector pin 51 or the second connector pin 52 and the third circumferential wall section 83 or the fourth circumferential wall section 84 extending around the first central axis 53 and the second central axis 54, respectively, may be less than 2.0 mm, less than 1.9 mm, less than 1.8 mm, less than 1.7 mm, less than 1.6 mm, less than 1.5 mm, less than 1.4 mm, less than 1.3 mm, less than 1.2 mm, or less than 1.1 mm. Alternatively or additionally, the ratio of the pin pitch 121 to the distance 127 between the connector pin and the third circumferential wall section / fourth circumferential wall section may be at least 4, at least 5, at least 6, or at least 7. The small spacing between the connector pins 51, 52 and the third circumferential wall section 83 / fourth circumferential wall section 84 allows the pins to be spaced far apart and reduces the risk of electrical creep current.

[0197] The protruding portion 61 may have a protruding width 124 measured along the width direction of the socket 60 (e.g., in the third plane 103). The protruding width 124 may be determined as the distance along the width direction between a first protruding section end 92 and a second protruding section end 93 where the second peripheral wall section 82 begins to curve inward with respect to a plane 112 connecting the ends of the third peripheral wall section 83 and the ends of the fourth peripheral wall section 84. By way of example, the protruding width 124 is obtained by determining the curve of the intersection line between the second peripheral wall section 82 and the third plane 103, determining the end portions 92, 93 of the protruding section 85 as the outermost points of the section on this curve of the intersection line that is separated from the first plane by a distance less than the maximum distance 123 such that the curve of the intersection line is determined by the ends of the third peripheral wall section 83 and the ends of the fourth peripheral wall section 84, and determining the protruding width 124 as the distance between these outermost points 93 and 94 that define the protruding width. The ratio of the protruding width 124 to the socket width 122 may be at least 0.60, or at least 0.61. When the socket has such a configuration, the protruding width 124 is relatively wide. The constriction formed in the bottom wall by such a wide protruding portion may further reduce the risk of electrolysis by reducing the risk of electrical creepage.

[0198] The ratio of the protruding portion height 126 to the radius of curvature 105 of the third peripheral wall section 83 and the fourth peripheral wall section 84 may be at least 0.50, at least 0.55, at least 0.60, at least 0.65, at least 0.70, at least 0.75, at least 0.80, at least 0.85, at least 0.90, or at least 0.95. Alternatively or additionally, the ratio of the protruding portion height 126 to the socket height 123 may be at least 0.15, at least 0.20, or at least 0.25. When the socket has such a configuration, the protruding portion height 126 is relatively high compared to a conventional female connector. The high protruding portion height 126 facilitates a configuration in which a screw head or bolt head can be separated from the socket and positioned adjacent to the socket, thereby further reducing the risks of electrical creepage and electrolysis.

[0199] Figures 6 to 12 show the power plug 150. The power plug 150 may be operable for insertion into the socket 50. Figure 6 shows a plan view of the power plug. Figure 7 shows a cross-sectional view. Figure 8 shows a partial perspective view. Figure 9 shows a partial plan side view. Figure 10 shows an exploded view. Figure 11 shows a cross-sectional view. Figure 12 shows a plan side view.

[0200] The power plug 150 includes a male connector 160. The male connector 160 is operable to be inserted into a mating socket (such as socket 50) of a device.

[0201] The power plug 150, more specifically, the male connector 160, may include a first connector sleeve 151 and a second connector sleeve 152. The first connector sleeve 151 and the second connector sleeve 152 may function to receive the connector pins 52, 51 therein. The first connector sleeve 151 and the second connector sleeve 152 are formed from a conductive material. The first connector sleeve 151 and the second connector sleeve 152 may be metal sleeves.

[0202] The first connector sleeve 151 has a first sleeve central axis 153. The second connector sleeve 152 has a second sleeve central axis 154. The first sleeve central axis 153 and the second sleeve central axis 154 may be parallel to each other. The first sleeve central axis 153 and the second sleeve central axis 154 may be spaced apart by a sleeve distance 221. The first sleeve central axis 153 and the second sleeve central axis 154 may define a first plane 201. When the male connector 160 is inserted into the socket, the first plane 201 of the power plug may coincide with the first plane 101 of the device socket.

[0203] The second plane 202 may be perpendicular to the first plane 201. The second plane 202 may extend parallel to the first sleeve central axis 153 and the second sleeve central axis 154. The second plane 202 may be equally spaced from the first sleeve central axis 153 and the second sleeve central axis 154. When the male connector 160 is inserted into the socket, the second plane 202 of the power plug may coincide with the second plane 102 of the device socket.

[0204] The end face 170 may include a first end face section 171 that extends laterally, for example, perpendicularly, with respect to the first plane 201 and the second plane 202. The first end face section 171 may include the first connector pin insertion opening 174.

[0205] The end face 170 may include a second end face section 172 that extends laterally with respect to the first plane 201 and the second plane 202. The second end face section may include the second connector pin insertion opening 175.

[0206] The first end face section 171 and the second end face section 172 may be planar. The first end face section 171 and the second end face section 172 may each have an annular shape that extends around the first pin insertion opening 174 and the second pin insertion opening 175, respectively.

[0207] The end face 170 may include a groove section that extends from the first end face section 171 to the second end face section 172 and defines a groove 173. The groove 173 is on the end face 170 and is disposed between the first end face section 171 and the second end face section 172.

[0208] The power plug 150 may further include a circumferential connector wall 180 that may extend from around the end face 170.

[0209] The circumferential connector wall 180 may include a first circumferential connector wall section 181, a second circumferential connector wall section 182, a third circumferential connector wall section 183 that is curved, intersects the first plane 201, and interconnects the first circumferential connector wall section 181 and the second circumferential connector wall section 182, and a fourth circumferential connector wall section 184 that is curved, intersects the first plane 201, and interconnects the first circumferential connector wall section 181 and the second circumferential connector wall section 182.

[0210] The first circumferential connector wall section 181 and the second circumferential connector wall section 182 may be arranged to face each other. The first circumferential connector wall section 181 and the second circumferential connector wall section 182 may be arranged on opposite long sides of the socket (this long side is also referred to as the width direction in this specification and in the art).

[0211] The first circumferential connector wall section 181 and the second circumferential connector wall section 182 may have different shapes, as will be described in more detail below. The second circumferential wall section 182 may include a notch 161. The first circumferential wall section 181 may not include a notch. The first circumferential wall section 181 may be planar.

[0212] The third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 may be arranged opposite to each other. The third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 may be arranged on the opposing short sides of the socket (this short side is also referred to as the height direction in this specification and in the relevant technical field). The third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 may each be curved from the first circumferential connector wall section 181 to the second circumferential connector wall section 182. The third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 are perpendicular to the first plane 201 and the second plane 202, and the intersection line of the third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 with a plane (especially any plane) intersecting them may be an arc of an ellipse such as a semi-circular or other elliptical arc. Alternatively or additionally, the intersection line of the third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 with a plane (especially any plane) parallel to the first plane 201 and the second plane 202 and intersecting the third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 may be a straight line. The third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 may be formed as a cylindrical section or a conical section, but are not limited thereto. The third plane 203 may be the plane on which the first end face section 171 and the second end face section 172 are arranged. The portions of the third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 closest to the third plane 203 (for example, located on the third plane 203) may include an arc having a radius of curvature, as will be described in more detail below.

[0213] The third circumferential connector wall section 183 may have a shape corresponding to the shape of a frustum-shaped surface or an angular section (or arc) of a cylindrical surface. This frustum-shaped or cylindrical arc section may extend over an angle 229. The angle 229 may be at least 170°.

[0214] The fourth circumferential wall section 184 may have a shape corresponding to the shape of a frustoconical surface or an angular section (or arc) of a cylindrical surface. This frustoconical or cylindrical arc section may extend over an angle 229. The angle 229 may be at least 170°. The angles 229 over which the third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 extend may be equal to each other, but are not limited thereto.

[0215] The angle 229 over which the third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 form a circular or elliptical arc may be different from the angle 129 over which the third circumferential wall section 83 and the fourth circumferential wall section 84 of the mating female connector form a circular or elliptical arc.

[0216] The first circumferential connector wall section 181 to the fourth circumferential connector wall section 184 may each extend from the bottom to the free end at the circumferential rim 162. The free end may be disposed at the end face 170.

[0217] The first circumferential connector wall section 181 may transition to the third circumferential connector wall section 183 along a line that can extend from the bottom at the circumferential rim 162 to the free end at the end face 170. (To be described in more detail below) The intersection of this transition line and the third plane 203 is shown as point 191 in FIG. 6.

[0218] The third circumferential connector wall section 183 may transition to the second circumferential connector wall section 182 along a line that can extend from the bottom at the circumferential rim 162 to the free end at the end face 170. The intersection of this transition line and the third plane 203 is shown as point 192 in FIG. 6.

[0219] The second circumferential connector wall section 182 may transition to the fourth circumferential connector wall section 184 along a line that can extend from the bottom at the circumferential rim 162 to the free end at the end face 170. The intersection of this transition line and the third plane 203 is shown as point 193 in FIG. 6.

[0220] The fourth circumferential connector wall section 184 may transition to the first circumferential connector wall section 181 along a line that may extend from the bottom in the peripheral rim 162 to the free end in the end face 170. The intersection of this transition line and the third plane 203 is shown as point 194 in FIG. 6.

[0221] The groove 173 in the end face may extend along the second plane 202. The groove 173 may extend from the first circumferential connector wall 181 to the second circumferential connector wall 182. The groove section forming the groove 173 may be recessed compared to the plane in which the first end face section 171 and the second end face section 172 extend.

[0222] The intersection of the end face 170 and the first plane 201 (as shown in FIG. 7) may have a concave shape in the groove 173. The point of the groove 173 closest to the plane in which the peripheral rim 162 extends may be located on or near the intersection line of the second plane 202 and the end face in the cross-section of the first plane 201.

[0223] The intersection of the end face 170 and the second plane 202 may have a flat or convex shape to facilitate the discharge of liquid.

[0224] The groove 173 may include a first inclined portion 176 extending from the first end face section 171 and a second inclined portion 177 extending from the second end face section 172. The first inclined portion 176 and the second inclined portion 177 may be more deeply recessed from the plane in which the first end face portion 171 and the second end face portion 172 are provided as the distance from the first end face portion 171 and the second end face portion 172 increases.

[0225] The groove 173 may be formed by a V-shaped or U-shaped recess in the end face 170.

[0226] The groove 173 may function to discharge water. The groove 173 may be useful for removing residual moisture.

[0227] The notch 161 is formed by a notch wall section 185 of the second circumferential wall section. The notch 161 functions to prevent reverse-polarity insertion into the socket of the device. The notch 161 also reduces the risk of being associated with a device having an ingress protection (IP) class (IPC) that does not match that of the power device equipped with the power plug 150, and / or a device that is not intended to be used on or with the power device equipped with the power plug 150.

[0228] The third plane 203 may extend perpendicular to both the first plane 201 and the second plane 202. The third plane 203 may be positioned such that the first end face section 171 and the second end face section 172 are disposed therein.

[0229] The power plug may have a plug connector width 222 measured along the first plane 201 (e.g., as the distance between point 195 and point 196 located on the third circumferential connector wall section 183, the fourth circumferential connector wall section 184, and the first plane 201). The ratio of the sleeve distance 221 to the plug connector width 222 may be at least 0.50, at least 0.55, at least 0.60, or at least 0.62. The sleeve spacing reduces the risk of creep current during use of the power plug 150.

[0230] The first plane 201 and the third plane 203 may intersect the circumferential connector wall 180 at a first intersection point 195, and the first plane and the third plane may intersect the circumferential connector wall 180 at a second intersection point 196. The plug connector width 222 may be the distance between the first intersection point 195 and the second intersection point 196. The ratio of the sleeve distance 221 to the plug connector width 222 may be at least 0.50, at least 0.55, at least 0.60, or at least 0.62. The sleeve spacing reduces the risk of creep current during use of the power plug 150.

[0231] When the third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 are rounded toward the end face 170 (as shown in the inset views 310, 312 of FIG. 7), the plug connector width 222 may be determined as follows. - Determining a first intersection point 195 as the intersection of a first tangent line 311 and a third plane 203, the first tangent line 311 being in a tangential direction with respect to the third circumferential connector wall 183 and located within the first plane 201, and determining the first intersection point 195 as the intersection of the first tangent line 311 and the third plane 203. - Determining a second intersection point 196 as the intersection of a second tangent line 313 and a third plane 203, the second tangent line 313 being in a tangential direction with respect to the fourth circumferential connector wall 184 and located within the first plane 201, and determining the second intersection point 196 as the intersection of the second tangent line 313 and the third plane 203. - Determining the plug connector width 222 as the distance between the first intersection point 195 and the second intersection point 196.

[0232] The power plug 150 may have a plug connector height 223. The plug connector height 223 may correspond to the maximum extension of the plug connector along the shorter of the two axes of the plug connector as viewed in a plan view. The plug connector height 223 may be determined using any one of the following techniques. - Determining an intersection line 211 between the first circumferential connector wall 181 and the third plane 203, determining points 192, 193 where the intersection line between the circumferential connector wall 180 and the third plane 203 has the maximum distance from the intersection line 211, and determining the distance from the intersection line 211 to the points 192, 193 as the plug connector height 223. - Determining an intersection line 211 between the first circumferential connector wall 181 and the third plane 203, determining points 192, 193 where the third circumferential wall section 183 and the fourth circumferential wall section 184 transition to the second circumferential wall section 182 on the intersection line in the third plane 203, and determining the greater of the two distances from the intersection line 211 to the points 192, 193 as the plug connector height 223. - Determine the points 191 and 192 as the intersection lines of the first plane 201, a plane parallel to the second plane 202 and passing through the first central axis 153, and the circumferential connector wall 70, and determine the plug connector height 223 as the distance between these points 191 and 192. - Determine the points 193 and 194 as the intersection lines of the first plane 201, a plane parallel to the second plane 202 and passing through the second central axis 154, and the circumferential connector wall 70, and determine the plug connector height 223 as the distance between these points 193 and 194. - Determine the radius of curvature 205 of the intersection line between the third circumferential connector wall 183 or the fourth circumferential connector wall 184 and the third plane 203, and determine the plug connector height 223 as twice the radius of curvature 205.

[0233] The ratio of the radius of curvature 205 to the sleeve distance 221 may be at most 0.35. A sleeve distance 221 that is long compared to the radius of curvature 205 (indicating the connector height) reduces the risk of electric creep current. A radius of curvature 205 (indicating the connector height) that is small compared to the sleeve distance 221 reduces the amount of liquid that can be introduced into the female connector during use, which also reduces the risk of electric creepage.

[0234] As described above, the second circumferential connector wall section 182 may have a notch section 185. The notch section 185 forms a notch 161 on the outer surface of the power plug 150. The notch 161 results in a decrease in the socket height measured along the second plane 202 as seen in the plan view (see FIG. 6). At the notch 161, the second circumferential connector wall section 182 protrudes towards the first circumferential connector wall section 181. By way of example, in any plane that coincides with or is parallel to the third plane 203 and intersects the circumferential connector wall section, the notch 161 may protrude towards the first circumferential connector wall section 181 compared to the points 192 and 193 on the second circumferential connector wall section 182 that are separated from the first circumferential connector wall section 181 by the maximum distance.

[0235] The notch 161 causes the plug connector 160 to have a reduced plug connector height 225 at the notch 161. The reduced plug connector height 225 at the notch 161 may be determined by determining an intersection line 221 between a first circumferential connector wall 181 and a third plane 203, determining a further intersection line 221 between a second circumferential connector wall 182 and the third plane 203, and determining the reduced socket height 225 at the notch 161 as the minimum distance measured perpendicular to the intersection line 221 of any point on a further intersection line from the intersection line 221.

[0236] The notch 161 has a notch height 226. The notch height 226 indicates how much the notch protrudes towards the first circumferential connector wall section 181. The notch height 226 may be determined as the subtraction of the reduced socket height 225 at the notch 161 from the socket height 223.

[0237] The notch 161 has a notch width 224. The notch width 224 may be measured along the width direction of the plug connector (e.g., in the third plane 203). The notch width 224 may be determined as the distance along the width direction between a first end and a second end of the notch section 185, at which distance the second circumferential connector wall section 182 begins to curve inwards with respect to a plane 212 interconnecting an end of the third circumferential connector wall section 183 and an end of the fourth circumferential connector wall section 184, or the notch width 224 may be determined by determining a curve of an intersection line between the second circumferential connector wall section 182 and the third plane 203, determining an end of the notch section 185 as the outermost point of a section on this curve of the intersection line that is spaced apart from the first plane 201 by a distance less than the maximum distance determined by an end of the third circumferential connector wall section 183 and an end of the fourth circumferential connector wall section 184, and determining the notch width 224 as the distance between these outermost points 192 and 193 of the notch section.

[0238] The notch 161 may extend from the peripheral rim 162 to the end face 170. The notch 161 may extend continuously from the peripheral rim 162 to the end face 170.

[0239] The first connector sleeve 151 may be recessed from the end face 170. The second connector sleeve 152 may be recessed from the end face 170.

[0240] The notch 161 may also function to provide various effects. The notch 161 may provide protection against reverse-polarity insertion of the power plug 150 into the socket. The notch 161 may function to define, by its geometry (such as size and position), into which socket the power plug 150 can be inserted. Thus, the notch 161 may enable the power plug to be inserted into a socket of a device having characteristics (such as IP characteristics) that match the characteristics of the power device equipped with the power plug, and / or prevent the power plug from being inserted into a socket of a device having characteristics (such as IP characteristics) that do not match the characteristics of the power device equipped with the power plug.

[0241] The power plug 150, particularly its connector 160, may have geometric features that contribute to improving characteristics by reducing the risk of electrical creepage and / or reducing the risk of insertion into an inappropriate socket.

[0242] The ratio of the plug connector height 123 to the plug connector width 122 may be at most 0.60, at most 0.55, at most 0.50, at most 0.45, or at most 0.40. Alternatively or additionally, the ratio of the plug connector height 123 to the sleeve distance 121 may be at most 0.60, at most 0.55, at most 0.50, at most 0.45, or at most 0.40. Such a power plug configuration further reduces the risk of undesirable electrolysis during use.

[0243] The ratio of the radius of curvature 205 to the plug connector width 222 may be up to 0.20. The ratio of the radius of curvature to the pin pitch may be up to 0.35 or up to 0.33. Such a power plug configuration further reduces the risk of undesirable electrolysis during use.

[0244] The ratio of the notch width 224 to the sleeve distance 221 may be at least 0.50, at least 0.55, at least 0.60, at least 0.65, at least 0.70, at least 0.75, at least 0.80, at least 0.85, at least 0.90, or at least 0.95. Such a power plug configuration further reduces the risk of undesirable electrolysis during use.

[0245] The ratio of the notch height 226 to the radius of curvature 205 may be at least 0.50, at least 0.55, at least 0.60, at least 0.65, at least 0.70, at least 0.75, at least 0.80, or at least 0.85. Alternatively or additionally, the ratio of the notch height 226 to the plug connector height 223 may be at least 0.15, at least 0.20, or at least 0.25. Such a power plug configuration further reduces the risk of undesirable electrolysis during use.

[0246] As shown in FIGS. 10 and 11, the power plug 150 may include a first component 164 and a second component 165. The first component 164 may be a first plastic component. The second plastic component 165 may be a second plastic component. The first component 164 may provide a male connector 160 including an end face 170 and a circumferential connector wall 180.

[0247] The second component 165 may form bend protection.

[0248] The second component 165 may provide a connection to the power cable 167. The second component 165 may include a bend protection portion 166. In the bend protection portion 166, the second component 165 may extend around the sheath of the power cable 167 received therein. The bend protection portion 166 may be provided with a recess to enhance flexibility (compared to the portion of the second component 165 where no recess is provided).

[0249] The first component 164 may be made of a more rigid material than the second component 165. The first component 164 may be made of a material having a first hardness (determined, for example, as shore hardness), and the second component 165 may be made of a material having a second hardness (determined, for example, as shore hardness).

[0250] The higher hardness of the first component 164 reduces the possibility that the second circumferential wall section 182 defining the notch 161 will flex when inserted into a socket having a socket geometry type (especially a protrusion geometry type) different from that of the power plug connector.

[0251] The proximal end portion of the first component 164 on the opposite side of the end face 170 may have a wall thickness reduction portion 167. The wall thickness reduction portion 167 may be formed by a step feature within the first component 164. The wall thickness reduction portion 167 may extend circumferentially around the first component 164.

[0252] The second portion 165 may be overmolded onto the wall thickness reduction portion 167.

[0253] FIG. 13 is a partial cross-sectional view showing the female connector 50 engaged with the male connector 150. The first connector pin 51 is received within the second connector sleeve 152. The second connector pin 52 is received within the first connector sleeve 151.

[0254] The plug connector of the power plug 150 and the socket of the device are dimensioned and shaped such that in the engaged state, the (outer) circumferential connector wall 180 of the power plug 150 is spaced from the (inner) circumferential wall 80 of the socket by a gap 230. The gap 230 may be a circumferential gap that extends completely along the (outer) circumferential connector wall 180 of the power plug 150 and is spaced from the (inner) circumferential wall 80 of the socket.

[0255] Alternatively or additionally, the socket bottom wall 70 may remain spaced from the end face 170 in the engaged state. Thereby, removal of residual liquid is facilitated and the risk of electrolysis is reduced.

[0256] FIG. 14 is a partially exploded view showing the connector pins 51, 52, and the connector sleeves 151, 152.

[0257] The connector pins 51, 52 may each include an enlarged diameter portion 241 and a reduced diameter portion 242 (such as a thickened end).

[0258] The connector sleeves 151, 152 may be formed as slotted metal sleeves having slots 243 that extend along the entire length of the connector sleeves 151, 152 so as to be expandable during connection. The connector sleeves 151, 152 may each include recesses 244 arranged to press against the reduced diameter portions 242 of the connector pins 51, 52 to hold the connector pins 51, 52 in a fixed state within the mating connector sleeves 152, 151.

[0259] The protrusion of the female connector on the device facilitates arranging a screw head or a bolt head outside the socket adjacent to the socket, as will be described in more detail with reference to FIG. 15.

[0260] FIG. 15 shows an end face of the housing of the device 20. An insertion opening of the socket of the female connector 50 is provided in the end face. The socket has a peripheral wall that defines a protrusion, as described in detail above. A recess 261 is provided adjacent to the socket 60. A screw head or bolt head 262 is received within the recess 261.

[0261] The recess 261 may be positioned adjacent to the socket 60 by a wall 265 or may be separated from the socket 60. By positioning the recess 261 for the head 262 outside the socket 60, it is possible to keep the socket 60 free of a screw head or bolt head. This further reduces the risk of electric creep current.

[0262] The recess 261 may be positioned so as to overlap a line 262 that interconnects an end of the third peripheral wall section 183 and an end of the fourth peripheral wall section 184. In this way, the region that is kept away from the socket 60 by the protrusion is at least partially used to allow the recess 261 to overlap it.

[0263] Other geometries of protrusions (female connectors) and notches (male connectors) may be used. Examples of the geometries of the protrusions and notches are shown and described with reference to FIGS. 16 to 18 for one further protrusion or notch geometry and FIGS. 19 to 21 for yet another further protrusion or notch geometry. FIGS. 16 and 19 show the female connector in plan view. FIGS. 17 and 20 show the corresponding male connector in plan view. FIGS. 18 and 21 are partial perspective views of the corresponding male connector. The various protrusions and notches are distinguished from one another, inter alia, by their protrusion / notch height and protrusion / notch width. These parameters may be determined as described with reference to FIGS. 1 to 15.

[0264] FIGS. 16 to 18 show connectors in which the protrusions (female connectors) or notches (male connectors) are more prominent than the connectors of FIGS. 4 to 12.

[0265] FIG. 16 is a plan view of a further female connector 270 that can be provided on the device. The further female connector 270 has a second peripheral wall section 272 that is different from the second peripheral wall section 182 of FIGS. 4 and 5. The second peripheral wall section 272 includes a protruding section 273 that forms a protrusion 271 having a protrusion height 275 that is higher than that of the female connector 50 of FIGS. 4 and 5. Accordingly, the reduced socket height 274 at the protrusion 271 is lower than that of the female connector 50 of FIGS. 4 and 5. The protrusion width 124 may remain the same as that of the female connector 50 of FIGS. 4 and 5, or may be narrower than the female connector 50 of FIGS. 4 and 5.

[0266] The ratio of the protrusion width 124 to the socket width 122 may be at least 0.60, or at least 0.61. When the socket has such a configuration, the protrusion width 124 is relatively wide. The constriction formed in the bottom wall by such a wide protrusion may further reduce the risk of electrolysis by reducing the risk of electrical creepage.

[0267] The ratio of the protrusion height 275 to the radius of curvature 105 of the third peripheral wall section 83 and the fourth peripheral wall section 84 may be at least 0.50, at least 0.55, at least 0.60, at least 0.65, at least 0.70, at least 0.75, at least 0.80, at least 0.85, at least 0.90, at least 0.95, at least 1.00, at least 1.05, or at least 1.10. Alternatively or additionally, the ratio of the protrusion height 275 to the socket height 123 may be at least 0.15, at least 0.20, at least 0.25, at least 0.30, at least 0.35, at least 0.4, at least 0.45, at least 0.50, or at least 0.55. This high protrusion height 275 facilitates a configuration in which a screw head or a bolt head can be separated from the socket and positioned adjacent to the socket, thereby further reducing the risks of electrical creepage and electrolysis.

[0268] Figures 17 and 18 show a further male connector 280 of a power plug operable for insertion into a further female connector 270 (although not necessarily limited thereto).

[0269] The further male connector 280 has a second circumferential connector wall section 282 that is different from the second circumferential connector wall section 182 of FIGS. 6 - 12. The second circumferential connector wall section 282 includes a notch section 283 that forms a plug connector notch 281 having a plug connector notch height 285 that is higher than that of the male connector 150 of FIGS. 6 - 12. Thus, the reduced plug connector height 284 at the plug connector notch 281 is lower than that of the male connector 150 of FIGS. 6 - 12. The notch width 224 may remain the same as compared to the male connector 150 of FIGS. 6 - 12, or may be narrower than the male connector 150 of FIGS. 6 - 12.

[0270] The ratio of the plug connector notch width 224 to the plug connector width 222 may be at least 0.60 or at least 0.61. Alternatively or additionally, the ratio of the notch width 224 to the sleeve distance 221 may be at least 0.50, at least 0.55, at least 0.60, at least 0.65, at least 0.70, at least 0.75, at least 0.80, at least 0.85, at least 0.90, or at least 0.95.

[0271] The ratio of the notch height 285 to the radius of curvature 205 of the third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 may be at least 0.50, at least 0.55, at least 0.60, at least 0.65, at least 0.70, at least 0.75, at least 0.80, at least 0.85, at least 0.90, at least 0.95, at least 1.00, at least 1.05, or at least 1.10. Alternatively or additionally, the ratio of the notch height 285 to the plug height 223 may be at least 0.15, at least 0.20, at least 0.25, at least 0.30, at least 0.35, at least 0.4, at least 0.45, at least 0.50, or at least 0.55. This high notch height 285 facilitates a configuration in which the screw head or bolt head can be separated from the socket and positioned adjacent to the socket, thereby further reducing the risk of electrical creepage and electrolysis.

[0272] Figures 19 to 21 show connectors in which the protrusions (male connectors) or notches (female connectors) are less prominent than the connectors of Figures 4 to 12.

[0273] Figure 19 is a plan view of a further female connector 290 that may be provided on a device. The further female connector 290 has a second circumferential wall section 292 that is different from the second circumferential wall section 182 of Figures 4 and 5. The second circumferential wall section 292 includes a protruding section 293 that forms a protrusion 291 having a lower protrusion height 295 than the female connector 50 of Figures 4 and 5. Accordingly, the reduced socket height 294 at the protrusion 291 is higher than that of the female connector 50 of Figures 4 and 5. The protrusion width 297 may be narrower than that of the female connector 50 of Figures 4 and 5, or may remain the same as that of the female connector 50 of Figures 4 and 5. The protrusion width 297 is determined as the distance between the end 296 of the curved protruding section (e.g., within the third plane 103) and the end 93.

[0274] The ratio of the protrusion width 297 to the socket width 122 may be at least 0.30, at least 0.35, or at least 0.40.

[0275] The ratio of the protrusion height 295 to the radius of curvature 105 of the third circumferential wall section 83 and the fourth circumferential wall section 84 may be at least 0.30, at least 0.35, or at least 0.40. Alternatively or additionally, the ratio of the protrusion height 295 to the socket height 123 may be at least 0.15, at least 0.20, at least 0.25, or at least 0.30.

[0276] Figures 20 and 21 show a further male connector 300 of a power plug operable for insertion, among other things (but not necessarily exclusively), into a further female connector 290.

[0277] The further male connector 300 has a second circumferential connector wall section 302 that is different from the second circumferential connector wall section 182 of the male connectors 150 of FIGS. 6-12. The second circumferential connector wall section 302 comprises a notch section 303 that forms a plug connector notch 301 having a plug connector notch height 305 that is lower than that of the male connectors 150 of FIGS. 6-12. Accordingly, the reduced plug connector height 304 at the plug connector notch 301 is higher than that of the male connectors 150 of FIGS. 6-12. The plug connector notch width 307 may be narrower than that of the male connectors 150 of FIGS. 6-12, or may remain the same as compared to the male connectors 150 of FIGS. 6-12. The plug connector notch width 307 is determined as the distance between an end 306 and an end 193 of a curved notch section (e.g., within a third plane 203).

[0278] The ratio of the plug connector notch width 307 to the plug connector width 222 may be at least 0.30, at least 0.35, or at least 0.40. Alternatively or additionally, the ratio of the notch width 307 to the sleeve distance 221 may be at least 0.15, at least 0.20, at least 0.25, or at least 0.30.

[0279] The ratio of the notch height 305 to the radius of curvature 205 of the third circumferential connector wall section 183 and the fourth circumferential connector wall section 184 may be at least 0.30, at least 0.35, or at least 0.40. Alternatively or additionally, the ratio of the notch height 305 to the plug height 223 may be at least 0.15, at least 0.20, at least 0.25, or at least 0.30.

[0280] As described above, different types of socket geometries and different types of plug connector geometries may be implemented. The various types of geometries may be distinguished from each other by the size and / or position of the protrusions (female connectors) and / or notches (male connectors). By way of example, the various types of geometries may be distinguished from each other by their protrusion / notch widths and / or protrusion / notch heights, as described above. The notch width and notch height of the power plug, and the protrusion width and protrusion height of the socket may each be determined using any one of the techniques described above.

[0281] Different notch geometries (e.g., different notch widths and / or notch heights) may be assigned to different characteristics such as different IPCs. Different protrusion geometries (e.g., different protrusion widths and / or protrusion heights) may be assigned to different characteristics such as different IPCs. By way of example, the kit - the socket has a socket protrusion geometry selected from the group consisting of a first socket protrusion geometry and a second socket protrusion geometry (and may consist of the first socket protrusion geometry and the second socket protrusion geometry, an optional third socket protrusion geometry, and any additional optional socket protrusion geometries), - The device may include a power supply plug having a plug connector notch geometry selected from the group including a first plug connector notch geometry and a second plug connector notch geometry (and may consist of a first plug connector notch geometry, a second plug connector notch geometry, an optional third plug connector notch geometry, and an optional additional plug connector notch geometry).

[0282] The different notch geometries may be distinguishable from each other in at least one of notch width and notch height. The different protrusion geometries may be distinguishable from each other in at least one of protrusion width and protrusion height. The different notch and protrusion geometries may be such that at least one of the socket protrusion geometries allows insertion of a plug connector having at least two types of different plug connector notch geometries. The different notch and protrusion geometries may be such that at least one of the plug connector notch geometries allows the plug connector to be inserted into a socket having at least two types of different socket protrusion geometries. The different notch and protrusion geometries may be, for example, such that when the power supply plug connector notch geometry is assigned an Ingress Protection Code (IPC) (e.g., determined according to IEC 60529, ISO 20653, or DIN 40050-9) that is incompatible with the IPC of the device (e.g., because the power supply device has a lower IPC than the IPC of the device), the protrusion geometry selectively prevents insertion of the power supply plug according to the characteristics associated with the power supply plug connector notch geometry.

[0283] The geometry of the notch and / or protrusion may be implemented in the following manner. - The male connectors of FIGS. 17 and 18 are insertable into the device sockets of FIGS. 4 and 5, the device socket of FIG. 16, and the device socket of FIG. 19. - The male connectors of FIGS. 6 to 12 can be inserted into the device sockets of FIGS. 4 and 5 and can also be inserted into the device socket of FIG. 16, but insertion into the device socket of FIG. 19 is blocked. - The male connectors of FIGS. 20 and 21 can be inserted into the device socket of FIG. 19, but insertion into the device sockets of FIGS. 4 and 5 and insertion into the device socket of FIG. 16 are blocked.

[0284] The geometry of the notch and / or protrusion may be implemented in the following ways. - The female connector of FIG. 19 can receive the power plug connectors of FIGS. 6 to 12, the power plug connectors of FIGS. 17 and 18, and the power plug connectors of FIGS. 20 and 21. - The female connectors of FIGS. 4 and 5 can receive the power plug connectors of FIGS. 6 to 12 and the power plug connectors of FIGS. 17 and 18, but block the insertion of the power plug connectors of FIGS. 20 and 21. - The female connector of FIG. 16 can receive the power plug connectors of FIGS. 17 and 18, but blocks the insertion of the power plug connectors of FIGS. 6 to 12 and the power plug connectors of FIGS. 20 and 21.

[0285] Various connector geometries may be assigned to different IP Cs and / or different other characteristics, ensuring that power devices compatible with more difficult characteristics (e.g., higher IP C) can also be used on equipment designed to meet only less difficult requirements (e.g., lower IP C).

[0286] By way of example and not limitation, connector geometries such as those described with reference to FIGS. 19 to 21 may be used for IPX0 plugs and devices. Connector geometries described with reference to FIGS. 4 to 12 may be used for IPX4 plugs and devices. Connector geometries described with reference to FIGS. 16 to 18 may be used for IPX7 plugs and devices.

[0287] Figure 22 is a table showing the use of a set of socket geometries and a corresponding set of plug connector geometries implemented as follows. - A plug designed to meet more difficult requirements (e.g., higher IPC) may be used not only in devices that meet these difficult requirements (such as the same high IPC as the plug), but also in devices that meet less difficult requirements (such as lower IPC than the plug). - The plug is prevented from being inserted into a socket of a device designed to meet requirements more difficult (e.g., higher IPC) than the plug (e.g., when the plug is designed for a lower IPC than the device).

[0288] The power device according to an embodiment may include a power plug according to an embodiment. The power device may be implemented as a power cord, as shown in FIG. 1. FIG. 23 shows another power device 190. The power device includes a plug 193 for engaging a power outlet, a support 191, and a stand 192 for receiving a device thereon. The stand 192 may include a power plug as contemplated herein or may be a power plug as contemplated herein. The support 191 may support the stand 192 in a generally upright position when a device is received thereon.

[0289] The power device may be operable to supply a supply voltage, for example, in the range of 2 - 18V, 4 - 12V, or a voltage of 5V or 12V. The power device may include a converter for performing a voltage down-conversion from a main power supply voltage, for example, 230V or 110V, to a supply voltage that is, for example, in the range of 2V - 18V, 4 - 12V, or a voltage of 5V or 12V.

[0290] Figure 24 is a schematic block diagram of devices 11 and 12. The devices include a female connector 21 that may have any one of the configurations disclosed herein. The female connector may be operable to receive a supply voltage, for example, in the range of 2 to 18V, 4 to 12V, or a voltage of 5V or 12V.

[0291] Devices 11 and 12 may further include a battery 22 that is operable to be charged in response to the supply voltage.

[0292] Devices 11 and 12 may further include an electromechanical actuator, such as a motor 23, that has an output operable to move in response to the supply voltage.

[0293] The housing 20 of devices 11 and 12 may provide a desired IP, which may be reflected by the socket geometry (e.g., protrusion geometry) of the female connector 21.

[0294] In various embodiments disclosed herein, the various dimensions of the quantities discussed herein may be as follows. It will be understood that not all of the dimensions specified below need to exist in combination.

[0295] Female connector The pin pitch 121 may be 5 mm or more, 6 mm or more, 7 mm or more, or 8 mm or more. The pin pitch 121 may be 12 mm or less, 11 mm or less, 10 mm or less, or 9 mm or less. The pin pitch 121 may be selected from one of the ranges of 5 mm to 12 mm, 6 mm to 11 mm, 7 mm to 10 mm, or 8 mm to 9 mm.

[0296] The socket width 122 may be 10 mm or more, 11 mm or more, or 12 mm or more. The socket width 122 may be 15 mm or less, 14 mm or less, or 13.5 mm or less. The socket width 122 may be selected from one of the ranges of 10 mm to 15 mm, 11 mm to 14 mm, or 12 mm to 13.5 mm.

[0297] The socket height 123 may be 4.0 mm or more, 4.3 mm or more, or 4.5 mm or more. The socket height 123 may be 5.5 mm or less, 5.2 mm or less, or 5.0 mm or less. The socket height 123 may be selected from one of the ranges of 4.0 mm to 5.5 mm, 4.3 mm to 5.2 mm, or 4.5 mm to 5.0 mm.

[0298] The radius of curvature 105 may be 1.8 mm or more, 2.0 mm or more, or 2.2 mm or more. The radius of curvature 105 may be 2.8 mm or less, 2.6 mm or less, or 2.4 mm or less. The radius of curvature 105 may be selected from one of the ranges of 1.8 mm to 2.8 mm, 2.0 mm to 2.6 mm, or 2.2 mm to 2.4 mm.

[0299] The protruding width 124 and the protruding height 126 may depend on the IP rating of the device as described above.

[0300] Male connector The sleeve distance 221 may be 5 mm or more, 6 mm or more, 7 mm or more, or 8 mm or more. The pin distance 221 may be 12 mm or less, 11 mm or less, 10 mm or less, or 9 mm or less. The sleeve distance 221 may be selected from one of the ranges of 5 mm to 12 mm, 6 mm to 11 mm, 7 mm to 10 mm, or 8 mm to 9 mm.

[0301] The plug connector width 222 may be 10 mm or more, 11 mm or more, or 12 mm or more. The plug connector width 222 may be 15 mm or less, 14 mm or less, or 13.5 mm or less. The plug connector width 222 may be selected from one of the ranges of 10 mm to 15 mm, 11 mm to 14 mm, or 12 mm to 13.5 mm.

[0302] The height 223 of the plug connector may be 4.0 mm or more, 4.3 mm or more, or 4.5 mm or more. The height 223 of the plug connector may be 5.5 mm or less, 5.2 mm or less, or 5.0 mm or less. The height 223 of the plug connector may be selected from one of the ranges of 4.0 mm to 5.5 mm, 4.3 mm to 5.2 mm, or 4.5 mm to 5.0 mm.

[0303] The radius of curvature 205 may be 1.8 mm or more, 2.0 mm or more, or 2.2 mm or more. The radius of curvature 205 may be 2.8 mm or less, 2.6 mm or less, or 2.4 mm or less. The radius of curvature 205 may be selected from one of the ranges of 1.8 mm to 2.8 mm, or 2.0 mm to 2.6 mm, or 2.2 mm to 2.4 mm.

[0304] The outer diameter 228 of the first connector sleeve 151 and the second connector sleeve 152 may be 2.0 mm or more, 2.2 mm or more, or 2.4 mm or more. The outer diameter 128 of the first connector sleeve 151 and the second connector sleeve 152 may be 3.2 mm or less, 3.0 mm or less, or 2.8 mm or less. The outer diameter 228 of the first connector sleeve 151 and the second connector sleeve 152 may be selected from one of the ranges of 2.0 mm to 3.2 mm, 2.2 mm to 3.0 mm, or 2.4 mm to 2.8 mm.

[0305] The notch width 224 and the notch height 226 may depend on the IP rating of the power device and / or equipment in which the male connector is designed, as described above.

[0306] Various effects are achieved by the devices, systems, kits, and methods disclosed herein. Improved protection against electrolysis can be achieved, facilitating use under conditions where residual fluid may tend to adhere to the connector. A platform can be implemented for combining the male and female connectors for multiple purposes while providing protection against undesirable reverse polarity engagement between the male and female connectors.

[0307] The dimensions and values disclosed in this specification are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise indicated, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as "40 mm" is intended to mean "about 40 mm".

Claims

1. A personal care device (11, 12), comprising: a housing having sockets (21, 50) for inserting plugs (43, 150, 280, 300); a first connector pin (51) and a second connector pin (52), at least a part of the first connector pin (51) and at least a part of the second connector pin (52) extending into the sockets (21, 50); the first connector pin (51) having a first central axis (53); the second connector pin (52) having a second central axis (54); the first central axis (53) and the second central axis (54) being spaced apart by a pin distance (121); the first central axis (53) and the second central axis (54) defining a first plane (101); a second plane (102) being perpendicular to the first plane (101), extending parallel to the first central axis (53) and the second central axis (54), and being equally spaced from the first central axis (53) and the second central axis (54); the sockets (21, 50) comprising a socket peripheral wall (80) and a socket bottom wall (70); the socket peripheral wall (80) comprising: a first peripheral wall section (81); a second peripheral wall section (82, 272, 292); a third peripheral wall section (83) that is curved, intersects the first plane (101), and interconnects the first peripheral wall section (81) and the second peripheral wall section (82, 272, 292); a fourth peripheral wall section (84) that is curved, intersects the first plane (101), and interconnects the first peripheral wall section (81) and the second peripheral wall section (82, 272, 292); the first peripheral wall section and the second peripheral wall section (82, 272, 292) being disposed on both sides of the first plane (101), and the third peripheral wall section (83) and the fourth peripheral wall section (84) being disposed on both sides of the second plane (102); the second peripheral wall section (82, 272, 292) comprising protruding sections (85, 273, 293), the protruding sections (85, 273, 293) forming protrusions (61, 271, 291); the socket bottom wall (70) comprising: A first bottom wall section (71) extending laterally with respect to the first plane (101) and the second plane (102), wherein the first connector pin (51) projects from the first bottom wall section (71), the first bottom wall section (71), and A second bottom wall section (72) extending laterally with respect to the first plane (101) and the second plane (102), wherein the second connector pin (52) projects from the second bottom wall section (72), the second bottom wall section (72), and A third plane (103) is perpendicular to the first plane (101) and the second plane (102), and the first bottom wall section (71) and the second bottom wall section (72) extend within the third plane (103), The third peripheral wall section (83) has a radius of curvature (105), and the ratio of the radius of curvature (105) to the pin pitch (121) is at most 0.35 or at most 0.33, the personal care device (11, 12). **Claim 2** The personal care device (11, 12) according to claim 1, including a first arc centered on the first central axis (53), where the intersection line between the third peripheral wall section (83) and the third plane (103) extends over a first angle (129) of at least 210°, and a second arc centered on the second central axis (54), where the intersection line between the fourth peripheral wall section (84) and the third plane (103) extends over a second angle (129) of at least 210°. **Claim 3** The first plane (101) and the third plane (103) intersect the socket peripheral wall (80) at a first intersection point (95), and the first plane (101) and the third plane (103) further intersect the socket peripheral wall (80) at a second intersection point (96). The socket width (122) is the distance between the first intersection point (95) and the second intersection point (96), and the ratio of the pin pitch (121) to the socket width (122) is at least 0.60, at least 0.61, or at least 0.

62. The personal care device (11, 12) according to claim 1 or 2. **Claim 4** The personal care device (11, 12) according to claim 3, wherein the ratio of the radius of curvature (105) to the socket width (122) is at most 0.

20. **Claim 5** The socket bottom wall (70) extends between the first bottom wall section (71) and the second bottom wall section (72), and further includes a rib (73) that protrudes with respect to the first bottom wall section (71) and the second bottom wall section (72) in order to separate the first bottom wall section (71) and the second bottom wall section (72). Optionally, the rib (73) extends continuously from the first peripheral wall section (81) to the second peripheral wall section (82, 272, 292), and further optionally, the rib (73) has a vertex line in the second plane (102), the personal care device (11, 12) according to any one of claims 1 to 4.

6. The first peripheral wall section (81) has a shape different from the shape of the second peripheral wall section (82, 272, 292), and optionally, the second peripheral wall section (82, 272, 292) is provided with the protrusion (61, 271, 291), and further optionally, a main portion of the protrusion (61, 271, 291) is in a curved shape, the personal care device (11, 12) according to any one of claims 1 to 5.

7. The second central axis (54) is offset from the first central axis (53) along the width direction, and the protruding section (85, 273, 293) has a protruding width (124, 297), which is measured along the width direction. When dependent on claim 3, the ratio of the protruding width (124, 297) to the socket width (122) is at least 0.50, at least 0.55, at least 0.60, or at least 0.61, the personal care device (11, 12) according to any one of claims 1 to 6.

8. The personal care device (11, 12) further includes a screw head (262) or a bolt head (262) exposed on the surface of the housing (20, 30), the housing (20, 30) includes a recess (261) in which the screw head or the bolt head (262) is disposed, and the recess (261) is separated from the socket (21, 50). Optionally, an interconnecting surface (112) interconnects the end of the third peripheral wall section (83) and the end of the fourth peripheral wall section (84), and the interconnecting surface (112) intersects the recess (261), the personal care device (11, 12) according to any one of claims 1 to 7.

9. A power component (22, 23) connected to the first connector pin (51) and the second connector pin (52) and designed to operate when the power supply voltage between the first connector pin (51) and the second connector pin (52) is in the range of 2 to 18 V, or 4 to 12 V, or a low voltage of 5 V. The personal care device (11, 12) according to any one of claims 1 to 8, further comprising.

10. The first connector pin (51) has a diameter measured perpendicular to the first central axis (53), and the diameter varies along the first central axis so as to allow the first connector pin (51) to be snap-fitted into the connector sleeve (152) of the male connector (43, 150, 280, 300). The personal care device (11, 12) according to any one of claims 1 to 9.

11. The fourth circumferential wall section (84) has a radius of curvature equal to that of the third circumferential wall section (83), and / or The ratio of the radius of curvature (105) to the pin distance (121) is at most 0.35 or at most 0.

33. The personal care device (11, 12) according to any one of claims 1 to 10.

12. A power plug (43, 150, 280, 300) for a personal care device (11, 12), A first connector sleeve (151), A second connector sleeve (152), and The first connector sleeve (151) has a first sleeve central axis (153), The second connector sleeve (152) has a second sleeve central axis (154), The first sleeve central axis (153) and the second sleeve central axis (154) are separated by a sleeve distance (221), The first sleeve central axis (153) and the second sleeve central axis (154) define a first plane (201), A second plane (202) is perpendicular to the first plane (201) and extends parallel to the first sleeve central axis (153) and the second sleeve central axis (154), and is equally spaced from the first sleeve central axis (110) and the second sleeve central axis (120). The power plug (43, 150, 280, 300) is An end face (170) having a first pin insertion opening (174) and a second pin insertion opening (175) disposed thereon, and a circumferential connector wall (180) extending from around the end face (170), wherein the circumferential connector wall (180) includes a first circumferential connector wall section (181), a second circumferential connector wall section (182, 282, 302), a third circumferential connector wall section (183) that is curved, intersects the first plane (201), and interconnects the first circumferential connector wall section (181) and the second circumferential connector wall section (182, 282, 302), and a fourth circumferential connector wall section (184) that is curved, intersects the first plane (201), and interconnects the first circumferential connector wall section (181) and the second circumferential connector wall section (182, 282, 302), wherein the first circumferential connector wall section (181) and the second circumferential connector wall section (182) are disposed on both sides of the first plane (201), and the third circumferential connector wall section (183) and the fourth circumferential connector wall section (184) are disposed on both sides of the second plane (202), the second circumferential connector wall section (182, 282, 302) includes a connector notch section (185, 283, 303), and the connector notch section (185, 283, 303) forms a connector notch (161, 281, 301), the end face (170) includes a first end face section (171) that extends laterally with respect to the first plane (201) and the second plane (202), and the first end face section (171) includes the first connector pin insertion opening (174), and a second end face section (172) that extends laterally with respect to the first plane (201) and the second plane (202), and the second end face section (172) includes the second connector pin insertion opening (175), a third plane (203) is perpendicular to the first plane (201) and the second plane (202), and the first end face section (171) and the second end face section (172) extend within the third plane (203), The third circumferential connector wall section (183) has a radius of curvature (205), and the ratio of the radius of curvature (205) to the sleeve distance (221) is at most 0.35, for a power plug (43, 150, 280, 300).

13. The third circumferential connector wall section (183) includes a first arc centered on the first central axis (153) extending over a first angle (229) of at least 210°, and the fourth circumferential connector wall section (184) includes a second arc centered on the second central axis (154) extending over a second angle (229) of at least 210°, for the power plug (43, 150, 280, 300) according to claim 12.

14. The first plane (201) and the third plane (203) intersect the circumferential connector wall (180) at a first intersection point (195), the first plane (201) and the third plane (203) intersect the circumferential connector wall at a second intersection point (196), the plug connector width (222) is the distance between the first intersection point (195) and the second intersection point (196), and the ratio of the sleeve distance (221) to the plug connector width (222) is at least 0.60, at least 0.61, or at least 0.62, for the power plug (43, 150, 280, 300) according to claim 12 or 13.

15. The end face (170) includes a groove (173) disposed between the first end face section (171) and the second end face section (172), Optionally, the groove (173) extends continuously between the first circumferential connector wall section (181) and the second circumferential connector wall section (182, 282, 302), for the power plug (43, 150, 280, 300) according to any one of claims 12 to 14.

16. A first plastic component (164) comprising the circumferential connector wall (180) and the end face (170) is formed from a first plastic material, and the power plug (43, 150, 280, 300) further comprises a second plastic component (165) connected to an end of the first plastic component (164) on the opposite side of the end face (170), the second plastic component (165) being formed from a second plastic material, the first plastic material having a first hardness, the second plastic material having a second hardness different from the first hardness, and optionally, the second plastic material forming a bend protection portion, the power plug (43, 150, 280, 300) according to any one of claims 12 to 15.

17. The first connector sleeve (151) is a first slotted sleeve that operates to snap fit onto a second connector pin (52) of a male connector, and / or the second connector sleeve (152) is a second slotted sleeve that operates to snap fit onto a first connector pin (51) of the male connector, the power plug (43, 150, 280, 300) according to any one of claims 12 to 16.

18. The fourth circumferential connector wall section (184) has a radius of curvature equal to that of the third circumferential connector wall section (183), and / or The ratio of the radius of curvature (205) to the sleeve distance (221) is at most 0.35 or at most 0.33, the power plug (43, 150, 280, 300) according to any one of claims 12 to 17.

19. A personal care device (11, 12) according to any one of claims 1 to 11, and The power device (40, 190) comprising a power plug (43, 150, 280, 300) according to any one of claims 12 to 18, the power device (40, 190) being operative to supply power to the personal care device (11, 12), a kit (10).

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