Patent Publication Number: US-11398708-B2

Title: Converter

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a national phase entry under 35 USC 371 of International Patent Application No. PCT/CN 2020/093476 filed on May 29, 2020, which claims priority to Chinese Patent Application No. 201910463658.9, filed on May 30, 2019, which are incorporated herein by reference in their entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to a converter. 
     BACKGROUND 
     A converter is a device that converts a form of socket into another one or more forms of sockets. 
     Standards of power plugs in various countries in the world are different. For example, three-pole plugs in China are the same as three-pole plugs in Australia, but two-pole plugs in China are different from two-pole plugs in Australia. The two-pin plugs in China are the same as two-pin plugs in the United States, but the three-pin plugs in China are different from three-pin plugs in the United States. Thus, conversions are generally required between sockets in a plurality of different countries and an international standard socket, so as to be able to use Chinese plugs. Therefore, a converter is needed. 
     For example, an European standard socket is converted into the international standard socket, and an American standard socket is converted into the international standard socket, so as to provide power supply for an electrical appliance with an international standard plug such as a mobile phone charger with the international standard plug and a notebook power supply with the international standard plug through the converter on the European standard socket and the American standard socket. 
     SUMMARY 
     Some embodiments of the present disclosure provide a converter. The converter includes a housing and a three-pole plug pin assembly. The three-pole plug pin assembly includes: a body disposed in the housing, the body being configured to be able to move relative to the housing, and the body including a cavity and a through hole communicated with the cavity; an L-pole plug pin and an N-pole plug pin that are fixed on the body, the body being capable of driving the L-pole plug pin and the N-pole plug pin to extend out of or retract into the housing when moving relative to the housing; an earth-pole plug pin separated from the body, the earth-pole plug pin passing through the through hole of the body; a first elastic member connected to the earth-pole plug pin and disposed in the housing; and a toggle button assembly connected to the body, the toggle button assembly being located in the cavity of the body, and the toggle button assembly being configured to be able to move relative to the body between a first position and a second position in the cavity. When the toggle button assembly is at the first position, the toggle button assembly is connected to the earth-pole plug pin, so that the toggle button assembly is capable of driving the earth-pole plug pin, the L-pole plug pin and the N-pole plug pin to extend out of the housing. When the toggle button assembly is at the second position, the toggle button assembly is separated from the earth-pole plug pin, so that the earth-pole plug pin is received in the housing under an action of the first elastic member. 
     In some embodiments, the toggle button assembly is configured to be clamped with the earth-pole plug pin at the first position, so as to be connected to the earth-pole plug pin. 
     In some embodiments, the toggle button assembly includes a toggle button and a lock pin. The toggle button includes a bracket and a mounting hole located in the bracket. The mounting hole is communicated with the through hole of the body, and the lock pin is located in the mounting hole, and the earth-pole plug pin passes through the mounting hole. The earth-pole plug pin includes a clamping groove located in a side face of the earth-pole plug pin. The lock pin is configured such that: when the toggle button assembly is at the first position, the lock pin extends into the clamping groove, so that the toggle button assembly is clamped with the earth-pole plug pin; and when the toggle button assembly is at the second position, the lock pin is separated from the clamping groove. 
     In some embodiments, the lock pin includes a lock pin body and a second elastic member. A first end of the second elastic member is connected to an inner wall of the bracket, and a second end of the second elastic member is connected to the lock pin body. The second elastic member is configured to apply an elastic force to the lock pin body, which enables the lock pin body to move towards the earth-pole plug pin. 
     In some embodiments, the lock pin further includes a first limiting portion, and the first limiting portion is located on an end of the lock pin body proximate to the second elastic member. The toggle button further includes a second limiting portion, and the second limiting portion is located at a side of the first limiting portion proximate to the earth-pole plug pin. The second limiting portion is capable of abutting against the first limiting portion, so as to prevent the lock pin body from moving towards the earth-pole plug pin. 
     In some embodiments, in a depth direction of the clamping groove, a dimension of the earth-pole plug pin is less than a dimension of the mounting hole, so that the lock pin body is capable of moving relative to the earth-pole plug pin. 
     In some embodiments, the housing includes a first sliding groove and a second sliding groove that are communicated with each other. The first sliding groove extends in a direction in which the earth-pole plug pin extends out of the housing, and the second sliding groove extends in a direction perpendicular to an extending direction of the first sliding groove. The toggle button further includes a hand-held portion, and the hand-held portion is fixedly connected to the bracket. The hand-held portion extends out of the housing, and the hand-held portion is capable of sliding along both the first sliding groove and the second sliding groove. The second sliding groove is configured such that: when the hand-held portion slides along the second sliding groove, the toggle button assembly moves relative to the body between the first position and the second position. 
     In some embodiments, the housing has a first side wall, and the first side wall is arranged opposite to the body. The housing includes a first blocking portion and a second blocking portion that are located on an inner surface of the first side wall. The first blocking portion is spaced apart from the second blocking portion in a direction in which the earth-pole plug pin extends out of the housing. The first blocking portion is configured to be able to abut against a side surface of the bracket proximate to the second blocking portion in a case where the L-pole plug pin, the N-pole plug pin and the earth-pole plug pin are received in the housing, so as to prevent the bracket from moving towards the second blocking portion. The second blocking portion is configured to be able to abut against a side surface of the bracket proximate to the first blocking portion in a case where the L-pole plug pin and the N-pole plug pin extend out of the housing, so as to prevent the bracket from moving towards the first blocking portion. 
     In some embodiments, the housing includes a boss located on the inner surface of the first side wall. The boss has a first end face and a second end face in the direction in which the earth-pole plug pin extends out of the housing. The first end face forms the first blocking portion, and the second end face forms the second blocking portion. 
     In some embodiments, the housing has a first side wall, and the first side wall is arranged opposite to the body. The three-pole plug pin assembly further includes a third elastic member. A first end of the third elastic member is connected to an inner wall of the body, and a second end of the third elastic member is connected to the bracket. The third elastic member is configured to apply an elastic force to the bracket, which enables the bracket to move towards the first side wall, so that the bracket is able to abut against the first side wall. 
     In some embodiments, an elastic coefficient of the third elastic member is greater than an elastic coefficient of the first elastic member. 
     In some embodiments, the through hole of the body includes a first through hole and a second through hole. The first through hole is spaced apart from the second through hole in a direction in which the earth-pole plug pin extends out of the housing. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to describe technical solutions in the present disclosure more clearly, accompanying drawings to be used in some embodiments of the present disclosure will be introduced briefly below. Obviously, the accompanying drawings to be described below are merely accompanying drawings of some embodiments of the present disclosure, and a person of ordinary skill in the art may obtain other drawings according to these drawings. In addition, the accompanying drawings to be described below may be regarded as schematic diagrams, and are not limitations on an actual size of a product, an actual process of a method and an actual timing of a signal to which the embodiments of the present disclosure relate. 
         FIG. 1  is a perspective view of a converter in accordance with some embodiments of the present disclosure; 
         FIG. 2  is a perspective view of a partial structure of a converter in accordance with some embodiments of the present disclosure; 
         FIG. 3  is a perspective view showing a state of a three-pole plug pin assembly of a converter in accordance with some embodiments of the present disclosure; 
         FIG. 4  is a perspective view showing another state of a three-pole plug pin assembly of a converter in accordance with some embodiments of the present disclosure; 
         FIG. 5  is an exploded perspective view of a three-pole plug pin assembly of a converter in accordance with some embodiments of the present disclosure; 
         FIG. 6  is a state diagram of a converter used as a three-pole socket in accordance with some embodiments of the present disclosure; 
         FIG. 7  is a state diagram of a converter used as a two-pole socket in accordance with some embodiments of the present disclosure; 
         FIG. 8  is a cross-sectional structural diagram in a case where a three-pole plug pin assembly of a converter is received in a housing in accordance with some embodiments of the present disclosure; and 
         FIG. 9  is a cross-sectional structural diagram in a case where a three-pole plug pin assembly of a converter extends out of a housing in accordance with some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Technical solutions in some embodiments of the present disclosure will be described clearly and completely with reference to the accompanying drawings below. Obviously, the described embodiments are merely some but not all embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art on a basis of the embodiments of the present disclosure shall be included in the protection scope of the present disclosure. 
     Unless the context requires otherwise, the term “comprise” and other forms thereof such as the third-person singular form “comprises” and the present participle form “comprising” throughout the description and the claims are construed as an open and inclusive meaning, i.e., “including, but not limited to”. 
     In the description of the specification, terms such as “one embodiment”, “some embodiments”, “exemplary embodiments”, “an example”, “specific example”, or “some examples” are intended to indicate that specific features, structures, materials or characteristics related to the embodiment(s) or example(s) are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms do not necessarily refer to the same embodiment(s) or example(s). In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any suitable manner. 
     Terms such as “first” and “second” are only used for descriptive purposes, and are not to be construed as indicating or implying the relative importance or implicitly indicating the number of indicated technical features below. Thus, a feature defined by “first” or “second” may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, the term “a plurality of/the plurality of” means two or more unless otherwise specified. 
     In the description of some embodiments, terms such as “coupled” and “connected” and their extensions may be used. For example, the term “connected” may be used in the description of some embodiments to indicate that two or more components are in direct physical or electrical contact with each other. 
     The phrase “at least one of A, B and C” has the same meaning as the phrase “at least one of A, B or C”, and both include the following combinations of A, B and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B and C. 
     The phrase “A and/or B” includes the following three combinations: only A, only B, and a combination of A and B. 
     The use of the phrase “applicable to” or “configured to” herein means an open and inclusive expression, which does not exclude devices that are applicable to or configured to perform additional tasks or steps. 
     Exemplary embodiments are described herein with reference to sectional views and/or perspective views as idealized exemplary drawings. 
     A three-pole plug pin assembly of a converter generally needs to be used with and without an earth-pole plug pin. In a case where the three-pole plug pin assembly is used with the earth-pole plug pin, the three-pole plug pin assembly is a three-pole plug, and in this case, the converter may be used as a three-pole socket. In a case where the three-pole plug pin assembly is used without the earth-pole plug pin, the three-pole plug pin assembly is a two-pole plug, and in this case, the converter may be used as a two-pole socket. In the related art, the earth-pole plug pin of the converter is generally hidden in a folding manner, and in a case where the converter is used as the two-pole socket, a user needs to rotate the earth-pole plug pin of the converter by a certain angle and fold it to be hidden in a housing of the converter. However, an operation of hiding the earth-pole plug pin is cumbersome, and it is inconvenient to operate when the converter is converted from the three-pole socket to the two-pole socket, and thus it is inconvenient for the user to use the converter. 
     As shown in  FIGS. 1 and 2 , some embodiments of the present disclosure provide a converter. The converter includes a housing  1  and a three-pole plug pin assembly  2 . As shown in  FIG. 5 , the three-pole plug pin assembly  2  includes a body  21  disposed in the housing  1 , a live-pole (L-pole) plug pin  22  and a neutral-pole (N-pole) plug pin  23  that are fixed on the body  21 , an earth-pole plug pin  24  separated from the body  21 , and a toggle button assembly  25  movably connected to the body  21 . The body  21  is configured to be able to move relative to the housing  1  in a Z direction. 
     As shown in  FIG. 5 , in some embodiments, the body  21  includes a cavity  211 , a first through hole  212  and a second through hole  213 .  FIG. 5  illustrates an XYZ coordinate system in which the X direction is the same as an arrangement direction of the L-pole plug pin  22  and the N-pole plug pin  23 , and the Z direction is the same as an extending direction of the earth-pole plug pin  24 . The X direction, the Y direction and the Z direction are perpendicular to each other. XYZ coordinate systems shown in other drawings are the same as the XYZ coordinate system shown in  FIG. 5 . In the Z direction shown in  FIG. 5 , the cavity  211  is communicated with the first through hole  212 , and the first through hole  212  and the second through hole  213  are arranged opposite to each other. In the X direction shown in  FIG. 5 , the L-pole plug pin  22  is located at a side of the first through hole  212  and the second through hole  213 , and the N-pole plug pin  23  is located at another side, opposite to the side, of the first through hole  212  and the second through hole  213 . 
     As shown in  FIG. 5 , in some embodiments, the toggle button assembly  25  includes a toggle button  27  and a lock pin  26 . The toggle button  27  includes a bracket  272  and a hand-held portion  271  fixed on the bracket  272 . The bracket  272  includes a mounting hole  2721 , and the mounting hole  2721  may be a through hole. As shown in  FIG. 5 , through holes on both sides of a second limiting portion  275  are communicated in the X direction, and the two through holes form the mounting hole  2721  together. 
     In use, the lock pin  26  is located in the mounting hole  2721  of the toggle button  27 , and the toggle button  27  is located in the cavity  211  of the body  21 . It will be noted that, a dimension of the toggle button  27  in the X direction shown in  FIG. 5  is less than a dimension of the cavity  211  in the X direction. In this way, the toggle button  27  is able to move in the X direction in the cavity  211 , so that the toggle button assembly  25  is movably connected to the body  21 . In this case, as shown in  FIGS. 3 and 4 , a portion of the mounting hole  2721  proximate to the hand-held portion  271  is opposite to the first through hole  212 . The earth-pole plug pin  24  sequentially passes through the mounting hole  2721 , the first through hole  212  and the second through hole  213  from top to bottom in the Z direction shown in  FIG. 5 . The first through hole  212  and the second through hole  213  are located at different heights in the Z direction shown in  FIG. 5 . On one hand, the earth-pole plug pin  24  is guided and limited to ensure that the earth-pole plug pin  24  passes through the first through hole  212  and the second through hole  213  and moves smoothly in the Z direction. On another hand, hole walls of the first through hole  212  and the second through hole  213  serve to support the earth-pole plug pin  24 , so as to ensure a stress balance when the earth-pole plug pin  24  and the toggle button assembly  25  are clamped, and to better keep the earth-pole plug pin  24  in a stable state. The lock pin  26  includes a lock pin body  260  and a second elastic member  261 . In a case where the lock pin  26  is mounted in the mounting hole  2721  of the toggle button  27 , a first end of the second elastic member  261  is connected to an inner wall of the mounting hole  2721 , and a second end of the second elastic member  261  is connected to the lock pin body  260 . The second elastic member  261  may be a spring or an elastic sheet, which is not specifically limited herein. 
     In some embodiments, in order to prevent the lock pin body  260  from moving under an action of an elastic force of the second elastic member  261 , so as to avoid interfering with surrounding components, as shown in  FIG. 5 , the lock pin  26  further includes a first limiting portion  262 , and the first limiting portion  262  is located on an end of the lock pin body  260  proximate to the second elastic member  261 . The toggle button  27  further includes the second limiting portion  275 , and the second limiting portion  275  is approximately located in the middle of the mounting hole  2721  in the X direction shown in  FIG. 5 . In the case where the lock pin  26  is mounted in the mounting hole  2721  of the toggle button  27 , the first limiting portion  262  is opposite to the second limiting portion  275 , the first limiting portion  262  is located at a left side of the second limiting portion  275  in the X direction, and the second limiting portion  275  is located at a right side of the first limiting portion  262  in the X direction. The second limiting portion  275  may abut against the first limiting portion  262 , so that a position of the lock pin body  260  relative to the toggle button  27  in the X direction is fixed. Therefore, a problem that the lock pin body  260  moves to other positions under the action of the elastic force of the second elastic member  261  and thus interferes with the surrounding components is avoided. 
     The lock pin body  260  and the second elastic member  261  are both located in a portion of the mounting hole  2721  away from the hand-held portion  271 , and in this case, the second elastic member  261  is in a compressed state. Since the lock pin  26  is disposed in the mounting hole  2721 , and the earth-pole plug pin  24  passes through the mounting hole  2721 , in the case where the toggle button assembly  25  and the earth-pole plug pin  24  are clamped (e.g., when the lock pin body  260  extends into a clamping groove  241  described below), a hole wall of the mounting hole  2721  may serve to limit and support the lock pin body  260  and the earth-pole plug pin  24 , which avoids the lock pin body  260  and the earth-pole plug pin  24  from shaking greatly, thereby enabling the toggle button assembly  25  and the earth-pole plug pin  24  to be clamped more firmly. 
     As shown in  FIGS. 3 to 5 , the earth-pole plug pin  24  includes the clamping groove  241  located in a side face thereof. After the earth-pole plug pin  24  is mounted in the mounting hole  2721  of the toggle button  27  and in the first through hole  212  and the second through hole  213  of the body  21 , the lock pin body  260  is capable of extending into the clamping groove  241  under the driving of the toggle button  27 , so that the toggle button assembly  25  is clamped with the earth-pole plug pin  24 , and thus the toggle button assembly  25 , the earth-pole plug pin  24  and the body  21  are connected together. The lock pin body  260  is also capable of disengaging from the clamping groove  241  under the driving of the toggle button  27 , so as to separate the toggle button assembly  25  from the earth-pole plug pin  24 . In a depth direction of the clamping groove  241  (in the X direction), a dimension m of the earth-pole plug pin  24  is less than a dimension n of the mounting hole  2721  (as shown in  FIG. 5 ), so that the lock pin body  260  is able to move relative to the earth-pole plug pin  24  in the depth direction of the clamping groove  241 . 
     Therefore, the toggle button assembly  25  is able to move relative to the body  21  between a first position (the position shown in  FIG. 3 , and in this case, the toggle button  27  and a left side wall of the cavity  211  have a gap therebetween, and the left side is a left side of the cavity  211  in the X direction shown in  FIG. 3 ) and a second position (the position shown in  FIG. 4 , and in this case, the toggle button  27  and a right side wall of the cavity  211  have a gap therebetween, and the right side is a right side of the cavity  211  in the X direction shown in  FIG. 4 ). As shown in  FIGS. 3 and 6 , when the toggle button assembly  25  is at the first position, the toggle button assembly  25  may be connected to the earth-pole plug pin  24 . Then, the toggle button assembly  25  drives the body  21  and the earth-pole plug pin  24  to move synchronously relative to the housing  1  in a length direction of the earth-pole plug pin  24  (e.g., the Z direction in  FIG. 3 ), so that the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  extend out of the housing  1 . As shown in  FIGS. 4 and 7 , when the toggle button assembly  25  is at the second position, the toggle button assembly  25  may be separated from the earth-pole plug pin  24 , so that the earth-pole plug pin  24  is received in the housing  1 . 
     As shown in  FIG. 2 , the three-pole plug pin assembly  2  further includes a first elastic member  29 . The first elastic member  29  is connected between the earth-pole plug pin  24  and the housing  1 . In a case where the first elastic member  29  is a spring, the spring is sleeved on the earth-pole plug pin  24 , an end of the spring is connected to the earth-pole plug pin  24 , and another end of the spring is connected to the housing  1 . In this way, when the toggle button assembly  25  is at the first position, the earth-pole plug pin  24  extends out of the housing  1 , and the first elastic member  29  is in a compressed state. When the toggle button assembly  25  is at the second position, the first elastic member  29  recovers from deformation, so that the earth-pole plug pin  24  is received in the housing  1 . 
     In the converter in some embodiments of the present disclosure, by providing the toggle button assembly  25 , in a case where the converter is used as a three-pole socket, the three-pole plug pin assembly  2  is a three-pole plug. As shown in  FIG. 3 , the toggle button assembly  25  is at the first position, and in this case, the toggle button assembly  25  is connected to the earth-pole plug pin  24 . As shown in  FIG. 6 , the toggle button assembly  25  is toggled to move downwards in the Z direction, and the toggle button assembly  25  drives the body  21  to move downwards in the Z direction together with the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24 , so that the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  extend out of the housing  1  synchronously. 
     In a case where the converter is used as a two-pole socket, the three-pole plug pin assembly  2  is a two-pole plug. As shown in  FIGS. 3 and 6 , the toggle button assembly  25  is first toggled to enable the toggle button assembly  25  to locate at the first position (in this case, the hand-held portion  271  is closer to the right side in the X direction in  FIG. 6 ), and the toggle button assembly  25  drives the body  21  to move downwards in the Z direction together with the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  synchronously, and in this case, the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  extend out relative to the housing  1 . As shown in  FIGS. 4 and 7 , in this case, the toggle button assembly  25  is toggled again to enable the toggle button assembly  25  to move to the second position (in this case, the hand-held portion  271  is closer to the left side in the X direction in  FIG. 7 ), so that the toggle button assembly  25  is separated from the earth-pole plug pin  24 , and the earth-pole plug pin  24  is rebounded back into the housing  1  under an action of the first elastic member  29 , thereby hiding the earth-pole plug pin  24  in the housing  1 . In this case, only the L-pole plug pin  22  and the N-pole plug pin  23  extend out relative to the housing  1 , and the three-pole plug pin assembly  2  may be the two-pole plug, which meets the requirement that the converter is used as the two-pole socket. 
     In some embodiments, the second elastic member  261  is configured to apply the elastic force to the lock pin body  260 , which enables the lock pin body  260  to move towards the earth-pole plug pin  24 . In this way, when the toggle button  27  drives the body  21  to retract the L-pole plug pin  22  and the N-pole plug pin  23  into the housing  1 , the lock pin body  260  abuts against the side face of the earth-pole plug pin  24  under the action of the elastic force of the second elastic member  261 . When the lock pin body  260  is opposite to the clamping groove  241 , the lock pin body  260  automatically extends into the clamping groove  241  under the action of the elastic force of the second elastic member  261 . Thus, the user does not need to manually toggle the toggle button  27  to enable the lock pin body  260  to re-extend into the clamping groove  241 , thereby facilitating the operation of the user. 
     In the converter in some embodiments of the present disclosure, the toggle button assembly  25  may be connected to the earth-pole plug pin  24 , and drive the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  to synchronously extend and retract relative to the housing  1 , so as to meet the requirement that the converter is used as the three-pole socket. The toggle button assembly  25  may also be separated from the earth-pole plug pin  24  to control the earth-pole plug pin  24  to be received in the housing  1 , so as to meet the requirement that the converter is used as the two-pole socket. Therefore, by toggling the toggle button assembly  25 , the converter may be switched rapidly to be used as the three-pole socket or the two-pole socket, and it is simple and convenient to operate and is convenient for the user to use the converter. 
     It will be noted that, when the toggle button assembly  25  is at the first position, a connection manner between the toggle button assembly  25  and the earth-pole plug pin  24  is not unique. In some embodiments, as shown in  FIG. 3 , the toggle button assembly  25  is configured to be clamped with the earth-pole plug pin  24 , so as to connect to the earth-pole plug pin  24 . By arranging the toggle button assembly  25  to be clamped with the earth-pole plug pin  24 , it is ensured that the toggle button assembly  25  is firmly connected to the earth-pole plug pin  24 , and when the toggle button assembly  25  is toggled, it is convenient to separate the toggle button assembly  25  from the earth-pole plug pin  24 . 
     In some other embodiments, the toggle button assembly  25  may also be connected to the earth-pole plug pin  24  in a magnetic attraction manner. That is, the toggle button assembly  25  may be connected to the earth-pole plug pin  24  through a magnetic member (e.g., a magnet). 
     The toggle button assembly  25  is not unique in structure. In some embodiments, as shown in  FIG. 5 , the toggle button  27  is movably connected to the body  21  in the X direction in  FIG. 5 , so that the toggle button assembly  25  is able to move between the first position and the second position. The lock pin  26  is configured such that: as shown in  FIG. 3 , when the toggle button assembly  25  is at the first position, the lock pin body  260  extends into the clamping groove  241 , so that the toggle button assembly  25  is clamped with the earth-pole plug pin  24 ; as shown in  FIG. 4 , when the toggle button assembly  25  is at the second position, the lock pin body  260  is separated from the clamping groove  241 . 
     In some other embodiments, arrangement positions of the lock pin  26  and the clamping groove  241  may also be reversed. That is, the lock pin  26  is disposed on the side face of the earth-pole plug pin  24 , and the clamping groove  241  is disposed on the toggle button  27 . After the arrangement positions of the locking pin  26  and the clamping groove  241  are reversed, the connection and separation of the toggle button assembly  25  and the earth-pole plug pin  24  may also be realized. 
     In some embodiments, in order to make the toggle button  27  move more smoothly under the user&#39;s toggle, as shown in  FIGS. 1, 6 and 7 , the housing  1  includes a first sliding groove  11  and a second sliding groove  12  that are communicated with each other. The first sliding groove  11  extends in the length direction of the earth-pole plug pin  24 , e.g., in the Z direction, and the second sliding groove  12  extends in a direction perpendicular to an extending direction of the first sliding groove  11  (e.g., in the X direction). When the three-pole plug pin assembly  2  is mounted in the housing  1 , the hand-held portion  271  of the toggle button  27  extends out of the housing  1  through the first sliding groove  11  or the second sliding groove  12 . The hand-held portion  271  is able to slide along the first sliding groove  11  and the second sliding groove  12 . The second sliding groove  12  is configured such that: as shown in  FIGS. 6 and 7 , when the hand-held portion  271  slides along the second sliding groove  12 , the toggle button assembly  25  may move relative to the body  21  between the first position (the position shown in  FIG. 3 ) and the second position (the position shown in  FIG. 4 ). The first sliding groove  11  serves to guide the hand-held portion  271  in a process that the user toggles the toggle button  27  to make the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  extend out of the housing  1 , thereby making the toggle button  27  move more smoothly. The second sliding groove  12  plays a guiding role when the user toggles the toggle button  27  to move relative to the body  21  between the first position and the second position, thereby making the toggle button  27  move more smoothly. 
     As shown in  FIG. 1 , the first sliding groove  11  has a first end  111  and a second end  112 , and the second end  112  is located below the first end  111  in the Z direction in which the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  extend out of the housing. As shown in  FIG. 1 , the second sliding groove  12  may be disposed at the second end  112  of the first sliding groove  11 , or may also be disposed at a middle portion of the first sliding groove  11  (a portion of the first sliding groove  11  except for the first end  111  and the second end  112 ), which is not specifically limited herein. 
     In some embodiments, as shown in  FIG. 1 , the housing  1  includes a bottom wall, a top wall, and four side walls between the bottom wall and the top wall. The top wall includes five receptacles that are configured to plug in a three-pole plug or a two-pole plug. As shown in  FIGS. 8 and 9 , the four side walls of the housing  1  include a first side wall  16 . The first side wall  16  and the body  21  are arranged in the Y direction. The housing  1  includes a first blocking portion  13  and a second blocking portion  14  that are located on an inner surface of the first side wall  16 , and the first blocking portion  13  and the second blocking portion  14  are spaced apart from each other in the Z direction. 
     As shown in  FIGS. 8 and 9 , the three-pole plug pin assembly  2  further includes a third elastic member  28 . A first end of the third elastic member  28  is connected to the body  21 , and a second end of the third elastic member  28  is connected to the bracket  272 . The third elastic member  28  is configured to apply an elastic force to the bracket  272 , which enables the bracket  272  to move towards the first side wall  16 , so that the bracket  272  may abut against the first side wall  16 . 
     The first blocking portion  13  is configured to be able to abut against a side surface of the bracket  272  proximate to the second blocking portion  14  (a lower surface in the orientation shown in  FIG. 5 ) in a case where the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  are received in the housing  1 , so as to prevent the bracket  272  from moving towards the second blocking portion  14 . 
     The second blocking portion  14  is configured to be able to abut against a side surface of the bracket  272  proximate to the first blocking portion  13  (an upper surface in the orientation shown in  FIG. 5 ) in a case where the L-pole plug pin  22  and the N-pole plug pin  23  extend out of the housing  1 , so as to prevent the bracket  272  from moving towards the first blocking portion  13 . 
     In some embodiments, as shown in  FIG. 8 , in the case where the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  are received in the housing  1 , the bracket  272  abuts against the first blocking portion  13  under an acting force of the third elastic member  28 , so as to prevent the bracket  272  from moving towards the second blocking portion  14 . In this case, if the hand-held portion  271  is not pressed in the Y direction to disengage the bracket  272  from the first blocking portion  13 , the toggle button  27  cannot move along the first sliding groove  11  in the housing  1 , and thus the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  cannot extend out relative to the housing  1 , which effectively prevents the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  from extending out due to mistakenly toggling the toggle button  27 . 
     As shown in  FIG. 9 , in the case where the L-pole plug pin  22  and the N-pole plug pin  23  extend out of the housing  1 , the bracket  272  abuts against the second blocking portion  14  under the acting force of the third elastic member  28 , so as to prevent the bracket  272  from moving towards the first blocking portion  13 . In this case, if the hand-held portion  271  is not pressed in the Y direction to disengage the bracket  272  from the second blocking portion  14 , the toggle button  27  cannot move along the first sliding groove  11  in the housing  1 , and thus the L-pole plug pin  22  and the N-pole plug pin  23  cannot be received in the housing  1 , which effectively prevents the L-pole plug pin  22  and the N-pole plug pin  23  from retracting into the housing  1  due to mistakenly toggling the toggle button  27 . 
     The first blocking portion  13  and the second blocking portion  14  are not unique in structure. In some embodiments, as shown in  FIGS. 8 and 9 , the housing  1  further includes a boss  17  located on the inner surface of the first side wall  16 . In the Z direction in which the L-pole plug pin  22  and the N-pole plug pin  23  extend out of the housing  1 , the boss  17  has a first end face  171  and a second end face  172 , and the second end face  172  is located below the first end face  171 . The first end face  171  forms the first blocking portion  13 , and the second end face  172  forms the second blocking portion  14 . In some other embodiments, both the first blocking portion  13  and the second blocking portion  14  may be blocking ribs. The first blocking portion  13  and the second blocking portion  14  are set as the two end faces of the boss  17 , which may increase strengths of the first blocking portion  13  and the second blocking portion  14 , thereby improving a blocking effect of the first blocking portion  13  and the second blocking portion  14  on the toggle button  27 . 
     As shown in  FIG. 9 , in the case where the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  extend out of the housing  1  synchronously, the toggle button  27  is simultaneously subject to the action of the first elastic member  29  and the third elastic member  28 . If the user releases the hand-held portion  271  prematurely, the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  may easily retract into the housing  1  under the action of the first elastic member  29  before the bracket  272  abuts against the second blocking portion  14 . In order to solve this problem, an elastic coefficient of the third elastic member  28  is greater than an elastic coefficient of the first elastic member  29 . In this way, when the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  extend out of the housing  1  synchronously, and the user releases the hand-held portion  271 , a speed at which the third elastic member  28  recovers from deformation is greater than a speed at which the first elastic member  29  recovers from deformation. Thus, a speed at which the bracket  272  moves under the action of the third elastic member  28  is greater than a speed at which the bracket  272  moves under the action of the first elastic member  29 . In this way, the bracket  272  may rapidly abut against the second blocking portion  14  under an action of an elastic force of the third elastic member  28 , so as to prevent the L-pole plug pin  22 , the N-pole plug pin  23  and the earth-pole plug pin  24  from retracting into the housing  1  under an action of an elastic force of the first elastic member  29 . 
     The first elastic member  29  may be a spring or an elastic sheet, which is not specifically limited herein. The third elastic member  28  may be a spring or an elastic sheet, which is not specifically limited herein either. 
     In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. 
     The above descriptions are merely specific implementation manners of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Changes or replacements that any person skilled in the art could readily conceive of within the technical scope of the present disclosure shall be included in the protection scope of the present disclosure. Therefore, the scope of the present disclosure shall be subject to the protection scope of the claims.