CN105261908B - Socket adapter with telescopic plug - Google Patents

Abstract

The invention discloses a kind of socket adapter with telescopic plug, including side to be provided with the housing of socket, is provided with slidingtype Plug base in housing, Plug base is provided with LN poles latch；Plug base is provided with guide rail hole and the earth polar latch slided in guide rail hole, spring-piece type position-limit mechanism is provided between Plug base and earth polar latch, the Plug base drive LN pole latch retracts to housing it is interior after, it is spacing by spring-piece type position-limit mechanism between Plug base and earth polar latch and be in linkage status.The earth polar latch of the present invention can stretch out or retract with LN poles latch, and conversion is convenient and is easy to carry, and has very high practical value.

Description

Socket Adapter with Retractable Plug

technical field

The invention relates to the technical field of electrical connection components, in particular to a socket converter with a retractable plug.

Background technique

The socket converter mainly converts one form of socket into another form or multiple forms of sockets. If it is necessary to convert between the socket standards of multiple different countries, it can be called a multi-country converter. For example, convert the European standard socket to the national standard socket conforming to the "GB 1002-2008: Single-phase plug and socket for household and similar purposes" standard, and convert the American standard socket to the national standard socket, so that the multi-country conversion can be performed on the European standard and American standard sockets The device provides power for electrical appliances with national standard plugs, such as mobile phone chargers and notebook power supplies with national standard plugs. Since the multi-country converter is used outside, it is very likely that there is a need to use a multi-country converter in different countries. However, the L and N poles of the socket standards in some countries in the world are the same, and only the requirements for the ground pin are different. Different, for example, the L and N poles in the Italian three-pole plug are the same as the two-pole sockets in Germany and Austria, but the two-pole sockets in Germany and Austria have no ground pole jacks, and the L and N poles of the American standard two-pole grounding plug are the same as those in the United States. Standard and Japanese standard two-pole sockets are compatible, but American standard and Japanese standard two-pole sockets do not have ground jacks, so whether the plugs of multi-country converters use ground pins is a choice that many manufacturers need to face. Most of the multi-country converter plug parts do not have a ground pin, that is, they have no grounding function; however, the jacks of the socket parts generally use a three-pole hole type, that is, with a ground hole, that is, the grounding jack on the socket is not realized. grounded. This form of multi-country converter cannot be sold normally in China, and untrue grounding is a potential safety hazard for some electrical appliances that need to be grounded. In the prior art, the following two methods are mainly used to solve the problem: 1. Use a multi-country converter with replaceable plug parts. For example, if you go to the UK, you will replace the plug part with the British standard plug on the main body of the converter. However, the existing multi-country converter generally has multiple plug parts, which is difficult to store or has a large volume after storage, and poor portability. 2. If you use converter kits from multiple countries, for example, if you go to the United States, you can take out the American converter from the kit. If you go to Italy, take out the Italian converter and use it. In this way, the number of converters is large, and the portability is poor. The publication date is June 24, 2015, and the Chinese patent document with the publication number CN204424645U discloses a plug with a telescopic ground pin, including a plug base and a two-pole pin. The pin mounting seat, the two-pole pins are installed in the pin mounting seat, the ground pin guide sleeve is provided in the plug mounting seat between the two pole pins, the ground pole pin is arranged in the ground pin guide sleeve, the top of the pin mounting seat is connected to the ground The corresponding part of the guide sleeve of the pole pin is provided with an avoidance hole for the expansion and contraction of the pole pin. The bottom of the pin mounting seat is also provided with a support seat. The pin limit mechanism is used to limit the extension and retraction of the two extreme positions of the ground pole pin. But this retractable earth pole plug adopts the limit block that rotates 180 degrees to fix the position of the earth pole. The pole is always protruding, which is not conducive to the miniaturization of the converter. The publication date is October 15, 2014, and the Chinese patent document with the publication number CN203883277U discloses a socket converter, including a housing, a grounding blade placed on the housing, a live wire blade and a neutral wire blade, and a set For the conductive components in the housing, transfer sockets are arranged symmetrically on both sides of the housing, and a housing cavity is provided directly below the corresponding grounding blade in the housing, and a housing cavity is provided to control the grounding blade to protrude or retract into the housing The movable assembly includes a resisting block and a spring arranged in sequence, the grounding insert is fixed on the resisting block, one end of the spring is fixedly connected to the resisting block, and the other end is fixedly connected to the bottom wall of the accommodating chamber, and the housing is close to the grounding insert The side wall on one side of the piece is provided with a chute and a limit groove that communicate with each other, and a shifting block that can slide on the chute is provided on the side of the conflicting block. One end of the shifting block is exposed outside the housing through the chute and can be Place it in the limiting groove through the chute. However, this socket converter adopts the accommodation chamber to accommodate the grounding blade, and the position of the grounding blade is fixed by the conflicting block and the spring arranged in the housing chamber. Every time the grounding blade is used, a special ground pole insertion is required. It is very inconvenient to use because the sheet sticks out for operation.

Contents of the invention

The purpose of the present invention is to solve the problem that the ground pole pin cannot extend with the LN pole pin after being retracted and is inconvenient to use in the retractable socket converter of the prior art, and provides a ground pole pin that can be LN pole pin protruding, easy-to-use socket adapter with retractable plug.

The specific technical solution adopted by the present invention to achieve the above object is a socket converter with a telescopic plug, which includes a housing with a socket on one side, a sliding plug base is provided inside the housing, and a socket on the plug base There is a LN pole pin; there is a shrapnel-type limit mechanism between the plug base and the ground pole pin. The type limit mechanism is limited and is in a linkage state. The LN pole plug refers to the L pole plug connected to the live wire and the N pole plug connected to the neutral line. The sliding plug base used to fix the L pole plug and the N pole plug in the present invention can slide along the guide rail in the housing to make the LN pole plug Extend the shell or retract the shell; the ground pole pin is slidably set on the guide rail and there is a shrapnel type limit mechanism between the ground pole pin and the plug base, when the plug base drives the LN pole pin to retract to After being inside the housing, the shrapnel type limit mechanism between the ground pole pin and the plug base works, so that the ground pole pin and the plug base are in a linkage state, that is, the ground pole pin can extend out of the shell with the plug base. In this way, the present invention solves the problem of inconvenient use that cannot be extended with the LN pole pin after the ground pole pin is retracted in the plug retractable socket converter in the prior art.

Preferably, a ground pole base is further provided in the housing, and a guide rail matched with a guide rail hole is provided on the ground pole base, and the ground pole pin slides on the guide rail. The sliding of the ground pole pin has better guidance, and it is not easy to deviate, so as to prevent the ground pole pin from being stuck after being deviated.

Preferably, the guide rail is a guide sleeve, the guide rail hole is a guide sleeve hole provided on the plug base, and the ground pin is slidably arranged on the guide sleeve. The ground pin is set on the guide sleeve and can slide relative to the guide sleeve, so that the ground pin stays on the guide sleeve or protrudes from the guide sleeve to the insertion direction, so that the ground pin is suitable for two-pole plugs or three-pole plugs Different requirements for plugs.

Preferably, the shrapnel-type limiting mechanism includes a limiting groove arranged in the circumferential direction of the inner wall of the guide sleeve hole, and the ground pole pin includes a hollow bolt main body, and a pressing needle and a limiting elastic piece are arranged inside the bolt main body, and the limiting elastic piece There is a limiting part on the top, and a notch corresponding to the limiting part is provided on the main body of the plug, and a through groove corresponding to the notch is provided on the axial direction of the guide sleeve. After the plug base drives the LN pole pin back into the housing, the limit The position-limiting portion on the spacer shrapnel is located in the space-limiting slot on the inner wall of the guide sleeve hole to form a space-limiting relationship. Whether the ground pole pin moves with the plug base is determined by controlling the limit shrapnel between the ground pin and the plug base. When the limit part of the limit shrapnel is located in the limit groove of the plug base, the ground pole pin is linked with the plug base, and at this time the ground pole pin expands and contracts with the plug base, that is, the plug at this time is with a ground pole pin Three-pole plug; when the plug is stretched out and the pressure pin located in the ground pin is pressed down, the pressure pin will cause the limit part on the limit shrapnel to lose its limit function through extrusion, and the limit part will break away from the restraint of the limit groove. The ground pole pin can move back relative to the plug base, so that when the L pole pin and N pole pin of the plug protrude out of the housing, the ground pole pin is retracted into the housing alone, and at this time the plug is converted into a plug without ground pole pin The two-pole plug; when the plug base returns to the inside of the housing again, that is, when the plug base is close to the ground base, the limit part on the limit shrapnel automatically slides into the limit groove after being squeezed by the edge of the guide sleeve hole , so that the ground pin and the plug base are in a linked state, and the next time the plug protrudes out of the housing, the ground pin also protrudes out of the housing. In the scheme that the ground pole pin slides relative to the guide sleeve, the scheme that the tubular guide sleeve is outside and the ground pole pin is inside the guide sleeve can be adopted, or the scheme that the tubular ground pole pin is outside and the guide sleeve is inside the ground pole pin .

Preferably, the head of the depressor protrudes from the plug-in end of the ground pin, the limit spring has a driving surface, and the rear of the depressor is provided with a drive arm abutting against the drive surface of the limit spring, when pressing and pushing the depressor head, The driving arm pushes the driving surface to disengage the limiting part from the limiting slot. The head of the indenter protrudes from the insertion end of the ground pin to facilitate the pressing operation of the indenter; and the driving arm pushes the driving surface to disengage the limit part from the limit slot, so that the ground pin can be retracted into the housing alone.

Preferably, the driving arm at the rear of the pressing needle is tubular, and the front end of the limiting elastic piece is U-shaped, and is arranged in the driving arm of the pressing needle; the driving surface is an inclined plane arranged at the rear end of the limiting elastic piece , the rear end of the slope extends out of the tubular driving arm to both sides and bends to form a limit part; the driving arm of the tubular structure of the driving arm is also provided with a compression spring, one end of the compression spring is in contact with the pressure needle, and the other end is in contact with the limiter. The front end of the bit shrapnel abuts. The tubular structure at the rear of the indenter can be pressed to make the inclined surface of the rear end of the limiting shrapnel enter the tubular structure of the indenter, so that the limiting part of the limiting shrapnel shrinks inward from both sides to the range of the guide sleeve, thus limiting The bit is out of the limit slot, and the ground pin has no linkage relationship with the plug base. Compression spring is used for reset of depressor.

Preferably, the socket includes a ground socket, and the ground socket is electrically connected to the ground pin through the guide rail. This structure realizes the real grounding of the socket, and eliminates the potential safety hazards of unreal grounding.

Preferably, there are two notches on the bolt body, which are symmetrically arranged on both sides of the rear end of the bolt body, and there are two through grooves on the guide sleeve, which are symmetrically arranged on the side wall of the guide bush, and the length of the through groove is not less than The protruding length of the ground pin. The gap is the entry and exit channel of the upper limit part of the limit shrapnel, and the through groove provides a sliding space for the limit part, so that the ground pole pin can still move along the guide sleeve with the plug base when the limit part pops out to both sides, that is, the plug base When sliding along the guide sleeve, the ground pole pin slides in the guide sleeve, and the limiting part of the limiting shrapnel slides in the through groove.

Preferably, the guide sleeve is in the shape of a round tube or a square tube, and the ground pins respectively correspond to a cylindrical structure or a square column structure, and the rear end of the guide sleeve is provided with a fixing hole for fixing to the ground base. The round tube solution is suitable for structures with cylindrical ground pins such as American Standard and European Standard. For socket adapters such as the British standard that use square-pillar ground pins, the guide sleeve can adopt a square tube scheme, and the corresponding ground pins have a square-column structure.

Preferably, the housing is composed of an upper housing and a lower housing, the jack of the socket is arranged on the upper housing, the plug hole for accommodating the plug is arranged on the lower housing, and one side of the sliding plug base is provided with a dial The moving block, the moving block is located on the outer wall of the casing, and the casing is provided with a moving groove corresponding to the moving block. The toggle block is used to move the plug base to realize the extension or retraction of the plug to be stored in the housing.

Preferably, the housing is provided with a control board that slides and engages with the ground base, one side of the control board is provided with buttons, the housing is provided with button holes corresponding to the buttons, and the control board is provided with guide rail avoidance holes and plug bases. The seat positioning rod, the control board and the ground base are also provided with a return spring and an anti-off buckle. The function of the control board is to restrict the protruding plug from receding. When the plug base is moved to make the plug protrude from the housing, the plug base positioning rod on the control board will abut against the plug base to prevent the plug base from receding. When the socket When the converter is stored after use, press the button to disengage the positioning rod from the plug base, and the plug can be retracted into the housing by moving the plug base.

Preferably, there are two return springs, which are arranged on two diagonal corners of the control board. The control board is extended with a return spring top plate, and the corresponding ground base is provided with a receiving groove. The return spring top plate and the return spring Placed in the corresponding accommodating tank; the side of the ground base facing the lower cavity is protruded with three clips, and the control board is provided with corresponding cards, and the control board and the ground base are slidingly connected by the cards and the clamps.

Preferably, a guide hole is further provided on the plug base, a connecting post corresponding to the guide hole is provided between the ground base and the housing, and the plug base is sleeved on the connecting post through the guide hole. The invention utilizes the connecting column fixed to the ground pole base as the guide column for the movement of the plug base, which can ensure the smooth sliding of the plug base and simplify the internal structure of the socket converter.

Preferably, the L pole pin and the N pole pin side of the plug base are provided with conductive sheets respectively connected with the L pole pin and the N pole pin, and the L pole pin hole and the N pole pin hole side of the housing are provided with The conductive seat is electrically connected to the L-pole socket and the N-pole socket respectively through wires. When the L-pole pin and the N-pole pin protrude from the housing, the conductive sheet is inserted into the corresponding conductive seat. Since the plug base is a movable structure, the present invention adopts the structure that when the L-pole plug and the N-pole plug extend out of the housing, the conductive sheet connected with the L-pole plug and the N-pole plug is inserted into the conductive seat and connected to the corresponding socket. It can avoid the problem that the wires move with the plug base caused by the direct connection of the wires, which may easily lead to the breakage of the wire connection, and improve the reliability of the socket converter.

The beneficial effect of the present invention is that it effectively solves the problem of inconvenient use that cannot be extended with the LN pole pin after the ground pole pin is retracted in the plug retractable socket converter of the prior art. The ground pole pin can be extended or retracted with the LN pole pin, which is convenient for conversion and portability, and has high practical value.

Description of drawings

Fig. 1 is a kind of structural sectional view of socket converter of the present invention;

Fig. 2 is a schematic diagram of a three-dimensional structure of the socket converter of the present invention;

Fig. 3 is a schematic diagram of an exploded structure of the socket converter of the present invention;

Fig. 4 is a schematic diagram of a connection structure between the ground base and the control board of the present invention;

Fig. 5 is a kind of partial structure sectional view of the present invention;

Fig. 6 is a schematic diagram of a three-dimensional structure of the plug base of the present invention;

Fig. 7 is a partial structural sectional view of the plug base of the present invention;

Fig. 8 is a schematic diagram of a three-dimensional structure of the control panel of the present invention;

Fig. 9 is a schematic diagram of a three-dimensional structure of the guide sleeve of the present invention;

Fig. 10 is a structural sectional view of the guide sleeve of the present invention;

Fig. 11 is a schematic diagram of a three-dimensional structure of the plug body of the present invention;

Fig. 12 is a structural sectional view of the bolt body of the present invention;

Fig. 13 is a schematic diagram of a three-dimensional structure of the indenter of the present invention;

Fig. 14 is a structural sectional view of the indenter of the present invention;

Fig. 15 is a schematic structural view of the limiting shrapnel of the present invention;

Fig. 16 is a schematic structural view of the ground pole socket of the present invention;

Fig. 17 is a schematic diagram of the positional relationship between the ground pin, the guide sleeve and the plug base when the plug of the present invention is retracted and retracted;

Fig. 18 is a schematic diagram of the positional relationship between the pole pin of the present invention and the guide sleeve and the plug base when it is stretched out;

Fig. 19 is a schematic diagram of a positional relationship between the earth pole pin, the guide sleeve and the plug base when the ground pole pin is retracted according to the present invention.

In the figure: 1. socket, 2. ground pole base, 3. guide sleeve, 4. plug base, 5. guide sleeve hole, 6. limit slot, 7. ground pole pin, 8. pin main body, 9. Pressing needle, 10. Limiting shrapnel, 11. Limiting part, 12. Notch, 13. Through groove, 14. Driving surface, 15. Compression spring, 16. Ground pole socket, 17. Fixing hole, 18. Upper shell Body, 19. Lower shell, 20. Toggle block, 21. Toggle groove, 22. Control panel, 23. Button, 24. Button hole, 25. Guide rail avoidance hole, 26. Plug base positioning rod, 27. Return spring, 28. Anti-off buckle, 29. Return spring top piece, 30. Accommodating groove, 31. Clamp plate, 32. Card, 33. Guide hole, 34. Connecting column, 35. Conductive sheet, 36. Conductive Seat, 37. lead wire, 38. pressing needle hole, 39. pressing needle head, 40. driving arm.

detailed description

The specific implementation of the present invention will be described in further detail below through examples and in conjunction with the accompanying drawings.

Example 1

In the embodiment 1 shown in Fig. 1, Fig. 2 and Fig. 3, a kind of socket converter with telescopic plug comprises a rectangular shell with a socket 1 on one side, and the shell consists of an upper shell 18 and a lower shell. The casing 19 is fastened, the jack of the socket is set on the upper casing (see Figure 2), the plug hole for accommodating the plug is set on the lower casing, and the casing is provided with an earth pole base 2 and a sliding plug base 4 (See Figure 4 and Figure 5), the plug base is provided with LN pole pins, the ground pole base is provided with guide rails, the plug base is provided with guide rail holes that slide with the guide rails, and ground pole pins 7, ground pole pins 7 It can slide on the guide rail. One side of the sliding plug base is provided with a toggle block 20 (see Figure 6) for controlling the position of the sliding plug base. The toggle block is located on the outer wall of the housing, and the housing is provided with A toggle groove 21 corresponding to the toggle block. The guide rail is a tubular guide sleeve 3 (see Figure 9 and Figure 10), and the plug base is also provided with a circular guide sleeve hole 5 that slides with the guide sleeve, and a limit groove 6 is provided on the inner wall of the guide sleeve hole. (see Figure 7), the ground pole pin set in the guide sleeve is a cylindrical structure, the ground pole pin includes a hollow structure pin body 8 (see Figure 11), and a pressing pin 9 is arranged inside the pin body (see Figure 13 Fig. 14) and the limit shrapnel 10 (see Fig. 15), the driving arm 40 at the rear of the pressing needle is tubular, the front end of the limiting shrapnel is U-shaped, and is arranged in the tubular structure of the driving arm of the pressing needle, the driving arm A compression spring 15 is also provided in the tubular structure, one end of the compression spring abuts against the pressure pin, and the other end abuts against the U-shaped bottom of the front end of the limit shrapnel; There is a needle hole 38 (see Figure 12) on the main body of the pin at the end of the needle, and the head 39 of the needle protrudes from the insertion end of the ground pole pin; the rear end of the guide sleeve is provided with The fixing hole 17 fixed to the pole base, the fixing hole in this embodiment is a screw hole, and the ground pole pin is fixed to the ground pole base by a screw; there is a driving surface 14 on the limit shrapnel, and the driving surface is arranged at the rear end of the limit shrapnel And the inclined surface is arranged obliquely, the rear end of the inclined surface extends out of the tubular driving arm to both sides and is bent to form a limit part 11, the latch body is provided with a gap 12 corresponding to the limit part, and the axial direction of the guide sleeve is provided with The notch corresponds to the through groove 13; there are two notches on the bolt body, which are symmetrically arranged on both sides of the rear end of the bolt body, and there are two corresponding through grooves, which are symmetrically arranged on the side wall of the guide sleeve. The length of the through groove Not less than the protruding length of the ground pin. The limit groove on the plug base, the upper limit shrapnel of the ground pin and the gap constitute the limit structure between the ground pin and the plug base. After the plug base drives the LN pole pin to retract into the housing, the plug base and the plug base The ground pole pins are limited by a shrapnel type limit mechanism and are in a linked state. (See Figure 17).

The housing is provided with a control board 22 (see Figure 8) that slides and engages with the base of the ground pole. One side of the control board is provided with a button 23, and the housing is provided with a button hole 24 corresponding to the button. The control board is provided with a guide rail. The avoidance hole 25 and the plug base positioning rod 26, the control board and the ground pole base are also provided with a return spring 27 and an anti-off buckle 28 (see Figure 3); there are two return springs, which are arranged on two opposite corners of the control board. There is a return spring top plate 29 extending on the control board, and the corresponding ground base is provided with a housing groove 30, and the return spring top plate and the return spring are placed in the corresponding housing groove; the ground base faces downward One side of the cavity is protrudingly provided with three clips 31, and the control board is provided with a corresponding card 32, and the control board and the ground base are slidably engaged by the cards and the clips.

The socket of this embodiment includes a ground pole socket 16 (see FIG. 16 ), and the ground pole socket and the ground pole pin are electrically connected by screws and guide sleeves for fixing the guide sleeve.

A guide hole 33 is also provided on the plug base, and a connection column 34 corresponding to the guide hole is provided between the ground pole base and the housing, and the plug base is sleeved on the connection column through the guide hole.

The L-pole plug and the N-pole plug of the plug base of the present embodiment are provided with conductive strips 35 respectively connected to the L-pole plug and the N-pole plug, and the L-pole plug hole of the housing is correspondingly arranged on the side of the N-pole plug hole. There is a conductive seat 36, and the conductive seat is electrically connected to the L-pole socket and the N-pole socket respectively through a wire 37. When the L-pole plug and the N-pole plug extend out of the housing, the conductive sheet is inserted into the corresponding conductive seat.

This embodiment is applicable to a plug whose ground pin is cylindrical.

Example 2

Embodiment 2 The guide sleeve is in the shape of a square tube, and the ground pole pin is in the shape of a square column. The rest is the same as in the first embodiment. Embodiment 2 is applicable to a plug in which the ground pin is in the shape of a square column.

The sliding plug base used to fix the LN pole pin of the present invention can slide along the guide rail in the housing, so that the LN pole pin protrudes out of the housing or retracts from the housing; the ground pole pin is arranged on the guide sleeve and can be moved relative to the guide sleeve Sliding, the limit shrapnel is controlled between the ground pin and the plug base to determine whether the ground pin moves with the plug base. When the plug base is close to the base of the ground pole, the limit part on the limit shrapnel is located in the limit groove on the inner wall of the guide sleeve hole (see Figure 5, Figure 17). At this time, the ground pin is linked with the plug base, and the ground The pole pin expands and contracts with the plug base. When the socket converter is used, the plug base is moved by the toggle block, the limit part slides in the through groove of the guide sleeve, and the plug protrudes out of the housing (see Figure 1 dotted line plug, Figure 1 18), the plug at this time is a three-pole plug with a ground pin, and the plug base positioning rod on the control board is against the plug base, the plug base cannot be moved back, and the converter can be used normally; when the socket converter is used When finished, press the control key to disengage the plug base positioning rod from the plug base, and now the plug base can be moved by the toggle block, so that the plug can be retracted into the housing for storage. When the plug is stretched out and the pressing pin inside the ground pin is pressed down, the driving arm pushes the driving surface to make the limit part break away from the limit slot, and the ground pin can move back relative to the plug base (see Figure 19), that is, the plug When the L and N poles of the L and N poles extend out of the housing, the ground pins are retracted into the housing alone, and the plug is converted into a two-pole plug without ground pins; when the plug base is returned to the inside of the housing again, the plug base When the base is close to the ground pole base, the limit part on the limit shrapnel will automatically slide into the limit slot after being squeezed by the edge of the guide sleeve hole, so that the ground pole pin and the plug base are in a linkage state again, and the next time the plug extends When out of the housing, the ground pin also extends out of the housing. In this way, the present invention solves the problem of inconvenient use that cannot be extended with the LN pole pin after the ground pole pin is retracted in the plug retractable socket converter in the prior art.

In addition to the above-mentioned embodiments, within the scope disclosed in the claims and description of the present invention, the technical features or technical data of the present invention can be re-selected and combined to form new implementations. These implementations of the present invention that have not been described in detail The method can be easily realized by those skilled in the art without creative work, so these implementations that are not described in detail should also be regarded as specific examples of the present invention and fall within the protection scope of the present invention.

Claims (7)

1. a kind of socket adapter with telescopic plug, including side are provided with socket（1）Housing, it is characterized in that, housing It is interior to be provided with slidingtype Plug base（4）, Plug base is provided with LN poles latch；Plug base is provided with guide rail hole and in guide rail The earth polar latch (7) slided in hole, spring-piece type position-limit mechanism, the Plug base band are provided between Plug base and earth polar latch Dynamic LN poles latch retract is spacing by spring-piece type position-limit mechanism between Plug base and earth polar latch and in joining to after in housing Dynamic state；Ground pole base (2) is additionally provided with the housing, ground pole base is provided with the guide rail coordinated with the guide rail hole, described Earth polar latch slides on the guide rail；Described guide rail is guide pin bushing（3）, described guide rail hole is to be arranged on Plug base Dowel hole（5）, earth polar latch is slidably disposed on guide pin bushing；The spring-piece type position-limit mechanism includes being arranged on dowel hole inwall Circumference on stopper slot（6）, the earth polar latch includes the bolt body of hollow structure（8）, bolt body is interior to be provided with pressing （9）And positive stop spring plate（10）, positive stop spring plate is provided with limiting section（11）, bolt body is provided with breach corresponding with limiting section （12）, the axial direction of guide pin bushing is provided with groove corresponding with breach（13）, the Plug base driven in the latch retract housing of LN poles Afterwards, the limiting section on positive stop spring plate, which is located in the stopper slot of dowel hole inwall, forms spacing relation.

2. the socket adapter according to claim 1 with telescopic plug, it is characterized in that, described pressing head （39）The inserted terminal of earth polar latch is stretched out, has drive surface on positive stop spring plate（14）, pressing rear portion, which is provided with, is connected to positive stop spring plate drive Actuating arm on dynamic face（40）, when pressing promotes pressing head, actuating arm promotes drive surface limiting section is departed from stopper slot.

3. the socket adapter according to claim 2 with telescopic plug, it is characterized in that, the actuating arm at pressing rear portion In a tubular form, the front end of the positive stop spring plate takes the shape of the letter U, and is arranged in the actuating arm of pressing；The drive surface is to be arranged on spacing bullet Piece rear end and the inclined-plane being obliquely installed, the rear end on inclined-plane extend tubulose actuating arm to both sides and bend composition limiting section.

4. the socket adapter according to claim 3 with telescopic plug, it is characterized in that, the tubular structure of actuating arm Actuating arm in be additionally provided with compression spring（15）, one end of compression spring abuts with pressing, the front end of the other end and positive stop spring plate Portion abuts.

5. the socket adapter according to claim 1 with telescopic plug, it is characterized in that, described socket includes ground Pole sleeve（16）, earth polar sleeve electrically connected by guide rail with earth polar latch.

6. the socket adapter according to claim 1 with telescopic plug, it is characterized in that, the breach on bolt body For two, the both sides of bolt body rearward end are symmetricly set on, the groove on guide pin bushing is two, is symmetricly set on the side wall of guide pin bushing On, the length of groove is not less than the extension elongation of earth polar latch.

7. the socket adapter according to claim 1 with telescopic plug, it is characterized in that, guide pin bushing is cylindrical or square Tubulose, described earth polar latch correspond to cylindrical structural or square column type structure respectively, and the rear end of guide pin bushing, which is provided with, to be used for and earth polar The fixing hole that pedestal is fixed（17）.