TWM447607U - Electrical connector - Google Patents

Description

Electrical connector

The present invention provides an electrical connector, in particular, a blocking portion is provided on the side wall of the movable seat inside the seat body, and a rotating body is pivotally connected to the housing outside the movable seat, and the rotating body is located around the shaft portion. The hook of the switch is rotated against the blocking portion to form a tilt toward the movable seat, so that the plug can be inserted into the position at one time, thereby ensuring the stability of the signal transmission.

According to the rapid development of electronic technology today, electronic devices such as notebook computers and tablet computers have become commonplace in all corners of the society, and because of the rapid development of the Internet, users are required to obtain instant information, transfer files or mail. You can connect to the Internet to work through electronic devices, and use the Internet to search for various information, instant messaging or online games.

Furthermore, as the development trend of notebook computers and tablet PCs tends to be thin and light, the electronic components on the internal circuit board of the electronic device must be reduced and more precise, and the overall structural strength needs to be followed. It is reinforced, and the general electronic device uses a connector to connect to the circuit board, and the connector can be connected to the network plug and connected to the plurality of signal terminals, thereby transmitting the signal through the circuit board to In the control circuit, the electronic device is connected to the network for work.

With the smaller and smaller size of electronic devices, various types of connectors have been developed, and the plug types can be generally classified into telephones, fax machines, and the like. The RJ-11 plug and the RJ-45 plug for electronic devices connected to the network, multi-function machine, etc., but because the RJ series of connectors are standard specifications and have a certain volume, today's notebook computers, tablets The thickness design requirements of electronic devices such as computers are smaller than those of the RJ series, making the overall thickness of the electronic device impossible to be thinner.

Therefore, in order to improve the above problems, a manufacturer has designed a clamshell connector which is pivotally provided with a cover B on the base A by a pivot A1 and formed between the base A and the cover B. There is a slot A0 for a plurality of terminals to be worn, and the space inside the slot A0 can be made smaller by closing the cover B to lower the overall height of the connector. When the user inserts the network plug C into the base A When the slot A0 is inside, the flipping of the cover B is pivoted upward by the pivot A1 to form a vertical angle, so that the network plug C is inserted into the slot A0, but the network plug C is When the skew is inserted, the elastic clasp C1 is directly pushed on the front side surface of the cover B due to the incorrect insertion angle, so that the cover B is pulled downward after being forced, resulting in the network plug C. The card C is easily formed into a card and cannot be inserted smoothly. If the user applies excessive force, the force of the flipping is too large, and the pivot A1 of the cover B jumping off the base A is formed. Separation, the overall structure is quite unstable, and those who have yet to work in this industry have been redesigned to effectively solve them.

Therefore, in view of the above-mentioned problems and shortcomings in the use of the above-mentioned clamshell connectors, the creators collected relevant information through various evaluations and considerations, and used them from The multi-year research and development experience in this industry has been continuously tried and modified, and the new type of electrical connector was born.

The main purpose of the present invention is to provide a blocking portion on the two side walls of the movable seat inside the seat body, and the movable seat is coupled with a rotating body pivotally connected to the outer casing and the outer casing of the positioning mechanism, and is rotated. The body is located at a periphery of the shaft portion and is provided with a hook that is rotated and abutted against the blocking portion of the movable seat, so that the rotating body is inclined toward the movable seat, and the external plug end face is aligned with the front end surface of the movable seat and can be rotated with the rotating body A lateral predetermined distance is formed at a periphery of the insertion interface, and the predetermined distance is slightly larger than a lateral clamping distance formed by the end surface of the plug to the front edge of the elastic buckle, and the front edge of the elastic buckle is not directly pushed on the front side of the rotating body. On the surface, in order to effectively prevent the rotating body from being dumped, the external plug can be pushed into the movable seat to be inserted into the position at one time, and form a good electrical connection state with the plurality of mating terminals, thereby ensuring the stability of the overall signal transmission.

The secondary purpose of the present invention is to position the inner side of the two side panels of the outer casing of the mechanism body toward the movable seat to extend the card body, and the card body has an inwardly extending elastic arm and is outwardly extended by the end of the elastic arm The top surface of the re-folding surface is bent and formed by a buckle portion at the top of the pushing top surface, and the external plug is elastically deformed when pushed on the pushing top surface of the locking body, and is clamped by the buckle portion. The latching portion at the inner side of the rotating body achieves the blocking position of the rotating body rotating toward the inner side, and the angle between the rotating body and the movable seat is less than 90 degrees, thereby ensuring direct lateral connection when the external plug is inserted Pushing on the top surface of the card body can effectively prevent the rotation of the rotating body from being caused when the external plug is plugged in.

Another purpose of the present invention is that a convex block is provided on the side wall of the movable seat at the rear of the shaft portion of the positioning mechanism, and the elastic arm of the positioning mechanism body is over the inner side of the block and is buckled. The abutting end of the elastic arm extending against the outer side of the stopper forms a stop position, so that the card body maintains a proper elastic preload force, and the resisting contact force of the card body can be increased, and the structure can be avoided. Insufficient strength leads to problems such as fatigue fatigue, excessive deformation or damage, and effectively extends the overall service life.

In order to achieve the above objectives and effects, the technical means and its construction adopted in the present invention are described in detail in the preferred embodiment of the present invention, and the structure and function are as follows.

Please refer to the first, second and third figures, which are the three-dimensional external view, the three-dimensional exploded view and the three-dimensional exploded view of another perspective. It can be clearly seen from the figure that the creation includes a seat body 1. The movable seat 2 and the positioning mechanism 3 are as follows. The main components and features of the present invention are as follows: wherein the base body 1 has a base portion 11 and the side arms 12 extend in the same direction on both sides of the base portion 11, and the two sides thereof A sliding space 10 for reciprocating displacement of the movable seat 2 and a hollow portion 101 at the bottom of the sliding space 10 are formed between the arm 12 and the base portion 11, and a movable movable seat 2 is positioned between the seat body 1 and the movable seat 2 The rail member 14 having the positioning end 141 is disposed at the inner side of the one side arm 12 of the base body 1 , and the outer cover of the seat body 1 is positioned with the shield shell 4 .

The movable base 2 has a bottom plate 21, and sidewalls 22 are formed on both sides of the bottom plate 21, and a docking space 20 is formed between the two side walls 22 and the bottom plate 21, and the bottom plate 21 of the movable seat 2 is positioned with a curved shape. The plurality of folded-shaped terminals abut the terminal 23, and the contact portion 231 at the side of the mating terminal 23 is located at the docking space 20, and the soldering portion 232 at the other side of the contact portion 231 is extended from the docking space 20 to A flexible circuit board (FPC) or a flexible planar cable (FFC) connecting unit 24, in addition, a side wall 22 of the movable seat 2 is provided with a guiding rod 25, and is disposed in front of the side wall 22 of the movable seat 2 There are positioning slots 221 for the positioning mechanism 3 to be combined, and the inner and outer sides of the side walls 22 at the inner and outer sides of the positioning groove 221 are respectively provided with an upwardly protruding stopper 222 and a blocking portion 223 protruding toward the positioning groove 221.

The positioning mechanism 3 includes an outer casing 31 and a rotating body 32. The outer casing 31 is sleeved and positioned on the bottom of the movable base 2, and is located at the positioning groove 221 in front of the two side plates 311 of the outer casing 31. A shaft portion 312 having a stud 3121 is disposed, and one of the protrusions 3121 is sleeved with a torsion spring 3122, and the outer casing 31 is located at the opposite inner side of the two side plates 311 and extends toward the docking space 20 of the movable seat 2. There is a suspended body 313, and the end of each of the engaging bodies 313 has a relatively inwardly extending elastic arm 3131 near the shaft portion 312 and a topping surface 3132 which is folded outward by the end of the elastic arm 3131. And the buckle portion 3133 which is bent outward is formed by the top of the pushing top surface 3132, and the buckle portion 3133 faces the elastic arm The 3131 extends to form a resisting end 3134 that resists positioning on the stop 222 of the side wall 22.

Furthermore, the positioning mechanism 3 is located on the shaft portion 312 of the outer casing 31 for pivoting a rotating body 32, and the insertion body 30 is formed between the rotating body 32 and the outer casing 31, and the rotating body 32 has a meandering shape. The frame 320 and the shaft hole 3201 pivotally connected to the protrusion 3121 are disposed at the lower end of the side plate 321 of the frame 320. The frame 320 has a limiting portion 322 at the inner side of the frame 320 and two sides of the limiting portion 322. The side plate 321 of the frame 320 is bent and extended to the side of the shaft portion 312 to be at least one hook 3211 which is disposed on the blocking portion 223 of the side wall 22, and the inner side of the two side plates 321 corresponds to The latching portion 3133 of the latching body 313 is provided with a latching portion 3212, and the latching portion 3133 of the latching body 313 and the latching portion 3212 of the side panel 321 can be a corresponding buckle and a buckle slot corresponding to the movable card. .

When the present invention is assembled, the movable base 2 is first pushed into the sliding space 10 of the base body 1, and the connecting unit 24 to which the plurality of docking terminals 23 are connected on the bottom plate 21 is a hollow portion 101 that passes through the sliding space 10. Exposed to the outside of the base 1, and then the other end of the connecting unit 24 (not shown) is electrically connected with a preset transmission interface (such as a connector or a transmission base), or is permeable. The preset transmission interface is electrically connected to the circuit board.

However, the base portion 11 of the base body 1 is recessed with a limiting slot 111, and a positioning post 211 is protruded from the rear of the bottom plate 21 of the movable base 2, that is, One end of the elastic member 13 is inserted into the limiting slot 111, and the other end is sleeved on the positioning post 211 for positioning. Then, one end of the guiding rod 25 on the side wall 22 of the movable base 2 is positioned at the outer side of the side wall 22. The inside of the through hole 220 and the other end are located in the track groove 14 in a cyclical sliding position. The outer casing 31 of the positioning mechanism 3 is positioned as a cover on the bottom of the movable seat 2, so that the frame 320 of the rotating body 32 is a shaft hole. The 3201 is pivotally connected to the corresponding protrusion 3121 on the shaft portion 312 of the outer casing 31, and the torsion spring 3122 on the protrusion 3121 is elastically supported by the two end pins respectively on the positioning groove 221 and the frame 320 on the side wall 22. The rotating body 32 has a function of elastic resetting, and at the same time, the side plate 311 of the outer casing 31 is positioned to abut on the periphery of the corresponding shaft hole 3201 of the rotating body 32, and the elastic arm 3131 of the locking body 313 is The card body 313 is placed on the inner side of the stopper 222 of the side wall 22 and is abutted against the outer side of the block 222 to form a stop position, so that the card body 313 maintains an appropriate elastic preload, and the card body 313 can be further increased. Resist the contact force and not easily cause excessive deformation or structural damage.

Please refer to the fourth, fifth and sixth figures for the three-dimensional appearance of the creative activity seat and the positioning mechanism, the three-dimensional appearance after exiting and the side view of the exit after the exit, which can be clearly seen from the figure. When the present invention is used, it can be directly pulled or pressed on the movable seat 2 by manual means, and the movable seat 2 is pressed to press the elastic member 13 to be elastically deformed, and during the process of pushing the movable seat 2 to continue pushing, The other end of the guide rod 25 will perform a cyclic sliding resisting and positioning action along the rail groove 14 at the inner side of the side arm 12 of the seat body 1 to make the movable seat 2 positions. The horizontal reciprocating sliding displacement is performed in the sliding space 10 of the seat body 1. When the movable seat 2 drives the guide bar 25 along the restriction of the rail groove 14 from the positioning end 141, the movable seat 2 can be released by releasing the squeeze. The elastic member 13 drives the movable seat 2 to laterally exit the sliding space 10 of the base body 1 to complete the first pressing and positioning operation, and simultaneously elastically supports the rotating body 32 of the positioning mechanism 3 by the torsion spring 3122 to make the rotating After the body 32 is released, the shaft portion 312 of the outer casing 31 is rotated toward the outer side to assume an open state.

During the rotation of the rotating body 32, the hook 3211 located at the periphery of the shaft portion 312 of the side plate 321 is rotated against the corresponding blocking portion 223 on the side wall 22 of the movable seat 2, so that the rotating body 32 is inclined toward the movable seat 2 Forming a predetermined angle, and the predetermined angle formed between the rotating body 32 and the movable seat 2 is preferably less than ninety degrees. However, in practical applications, it is not limited to the scope of the patent of the present invention. The RJ-45 plug 5 (shown in FIGS. 5 and 6) providing an external electrical connector may be formed at a lateral predetermined distance D1 from the periphery of the insertion interface 30 of the rotating body 32 when the end surface is aligned with the front end surface of the movable base 2. And the predetermined distance D1 is slightly larger than the lateral clamping distance D2 formed by the end face of the RJ-45 plug 5 to the front edge of the elastic clasp 51, and allows the user to insert the RJ-45 plug 5 laterally into the docking of the movable seat 2. When the space 20 is inside, the front edge of the elastic clasp 51 is not directly pushed on the front side surface of the rotating body 32, and the shaft portion 312 of the outer casing 31 of the rotating body 32 is restricted by the hook 3211 engaging the blocking portion 223. Rotate the shaft to the outside to maximize the angular range to facilitate horizontal insertion of the RJ-45 plug 5 The mating space 20 of the movable seat 2 is electrically connected to the plurality of mating terminals 23.

Please continue to refer to the seventh figure, which is a three-dimensional appearance of the creative activity seat and the positioning mechanism. It can be clearly seen from the figure that when the user wants to slide the movable seat 2 from the seat 1 When the inner end of the 10 is folded, the shaft portion 312 of the outer casing 31 of the outer casing 31 is only required to be rotated first to rotate the inner side of the housing 31 to be closed, and then the movable seat 2 is pressed once and the movable seat 2 is driven. The squeezing elastic member 13 is elastically deformed, and the slider 224 protruding from the two sides of the movable seat 2 respectively guides and limits the sliding displacement of the corresponding guide rail 121 on the two side arms 12 to make the activity The seat 2 is smooth and smooth during the sliding process. When the other end of the guide rod 25 is slid to the positioning end 141 of the rail groove 14, the movable seat 2 can be released and folded into the seat body 1 to complete the second pressing and positioning. The second pressing method allows the user to perform a lateral reciprocating sliding displacement by pressing the sliding space 10 of the movable seat 2 in the seat body 1 to assist the movable seat 2 to smoothly complete the folding or withdrawing, and the overall height is lowered. It is thinner.

Please also refer to the second, sixth, seventh, eighth and ninth figures, which are the three-dimensional exploded view of the creation, the side view of the movable seat and the positioning mechanism after exiting, the three-dimensional appearance of the folding, and the better implementation. The three-dimensional external view of the example and the partial enlarged view of the eighth figure can be clearly seen from the figure. The present invention is applied to an electronic device 6 such as a computer, a notebook computer, a tablet computer, etc., and the body 61 of the electronic device 6 is The seat body 1 can be integrally formed or separately assembled, and the movable seat 2 is The connecting unit 24 connected to the plurality of docking terminals 23 can be electrically connected to the circuit board inside the body 61 by a preset transmission interface for external network signal input and output and power supply, so that the external unit can be used. The RJ-45 plug 5 is laterally inserted into the docking space 20 of the movable base 2 along the rail piece 3211 of the positioning mechanism 3 at the plug interface 30, and is electrically connected to the plurality of mating terminals 23.

During the insertion of the external electrical connector, the RJ-45 plug 5 end face can be pushed over the top surface 3132 of the locking body 313 at the inner side of the opposite side plates 311 of the outer casing 31, and the elastic arm 3131 is subjected to After the pressing, the outer side is elastically deformed, and the locking portion 3133 of the locking body 313 is laterally held by the latching portion 3212 at the inner side of the rotating body 32 to rotate the rotating body 32 toward the inner side. Blocking the positioning, and because the angle between the rotating body 32 and the movable seat 2 is less than ninety degrees, the RJ-45 plug 5 is not pushed on the rotating body 32 when inserted, and the RJ-45 is ensured. When the plug 5 is inserted, it can be directly pushed on the top surface 3132 of the locking body 313 to facilitate the latching portion 3133 of the locking body 313 to be latched on the latching portion 3212 of the rotating body 32. When the RJ-45 plug 5 is plugged in, the rotation of the rotating body 32 may cause the screwing of the rotating body 32, and the RJ-45 plug 5 may be inserted into the bit once and docked with the plurality. The terminal 23 forms a good electrical connection, thereby ensuring the stability of the signal transmission, and at the same time, the elastic buckle 51 on the RJ-45 plug 5 is stabilized. Held in the stopper portion 32 of the rotating body 32 2 is positioned in a position, and can be connected to the electronic device 6 through the connection unit 24 for signal transmission and communication processing.

However, when the external electrical connector is pulled out, the RJ-45 plug 5 can be displaced along the elastic arm 3131 of the locking body 313, and the RJ-45 plug 5 can be moved to the appropriate position, and the elastic arm can be transmitted through the elastic arm. The elastic restoring force of the 3131 causes the locking body 313 to return to the original position, and is held by the abutting end 3134 of the locking body 313 against the outer side of the stopper 222 of the side wall 22 of the movable seat 2 to maintain proper elasticity. The structural design of the card body 313 can effectively prevent the card body 313 from being twisted or deformed due to improper extrusion of the RJ-45 plug 5, and has better structural strength and can avoid the cause. The structural strength of the body 313 is insufficient due to insufficient structural strength.

The above detailed description is intended to illustrate a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and other equivalents and modifications may be made without departing from the spirit of the invention. Changes are to be included in the scope of patents covered by this creation.

In summary, the above-mentioned electrical connector can achieve its efficacy and purpose. Therefore, this creation is a practical and excellent creation, which is in line with the application requirements of the new patent, and the application is submitted according to law. This case is given to protect the creators' hard work. If there is any doubt in the bureau, please do not hesitate to give instructions. The creators will try their best to cooperate with them.

1‧‧‧ body

10‧‧‧Sliding space

101‧‧‧镂空部

11‧‧‧ base

111‧‧‧ Limit slot

12‧‧‧ side arm

121‧‧‧rails

13‧‧‧Flexible components

14‧‧‧ rail slot

141‧‧‧ Positioning end

2‧‧‧ activity seat

20‧‧‧ docking space

223‧‧‧blocking

21‧‧‧floor

211‧‧‧Positioning column

22‧‧‧ side wall

220‧‧‧Perforation

221‧‧‧ positioning slot

222‧‧ ‧block

224‧‧‧ Slider

23‧‧‧Docking terminal

231‧‧‧Contacts

232‧‧‧Weld Department

24‧‧‧ Connection unit

25‧‧‧Guide bars

3‧‧‧ Positioning mechanism

30‧‧‧Interface

31‧‧‧Outer casing

311‧‧‧ edge board

312‧‧‧Axis

3121‧‧‧Bump

3122‧‧‧torsion spring

313‧‧‧Card body

3131‧‧‧Bounce arm

3132‧‧‧ pushed top surface

3133‧‧‧Snaps

3134‧‧‧Resistance

32‧‧‧Rotating body

320‧‧‧Frame

3201‧‧‧Axis hole

321‧‧‧ side panel

3211‧‧‧ hook

3212‧‧‧Detention Department

322‧‧‧Limited

3221‧‧‧ rail piece

4‧‧‧Shield housing

5‧‧‧ plug

51‧‧‧Flexible clasps

6‧‧‧Electronic devices

61‧‧‧Ontology

A‧‧‧Base

A0‧‧‧ slots

A1‧‧‧ pivot

B‧‧‧ cover

C‧‧‧Network Plug

C1‧‧‧elastic buckle

The first picture is a three-dimensional appearance of the creation.

The second picture is a three-dimensional exploded view of the creation.

The third figure is a three-dimensional exploded view of another perspective of the creation.

The fourth figure is a three-dimensional appearance of the creative activity seat and the positioning mechanism.

The fifth figure is a three-dimensional appearance of the creative activity seat and the positioning mechanism.

The sixth figure is a side cross-sectional view of the creative activity seat and the positioning mechanism after exiting.

The seventh figure is a three-dimensional appearance of the creative activity seat and the positioning mechanism.

The eighth figure is a perspective view of the preferred embodiment of the present invention.

The ninth figure is a partial enlarged view of the eighth figure of the creation.

Figure 10 is a side view of a conventional clamshell connector.

1‧‧‧ body

10‧‧‧Sliding space

101‧‧‧镂空部

11‧‧‧ base

111‧‧‧ Limit slot

12‧‧‧ side arm

121‧‧‧rails

13‧‧‧Flexible components

14‧‧‧ rail slot

141‧‧‧ Positioning end

2‧‧‧ activity seat

20‧‧‧ docking space

21‧‧‧floor

211‧‧‧Positioning column

22‧‧‧ side wall

221‧‧‧ positioning slot

222‧‧ ‧block

223‧‧‧blocking

224‧‧‧ Slider

23‧‧‧Docking terminal

231‧‧‧Contacts

24‧‧‧ Connection unit

25‧‧‧Guide bars

3‧‧‧ Positioning mechanism

30‧‧‧Interface

31‧‧‧Outer casing

311‧‧‧ edge board

3134‧‧‧Resistance

32‧‧‧Rotating body

320‧‧‧Frame

312‧‧‧Axis

3121‧‧‧Bump

3122‧‧‧torsion spring

313‧‧‧Card body

3131‧‧‧Bounce arm

3132‧‧‧ pushed top surface

3133‧‧‧Snaps

3201‧‧‧Axis hole

321‧‧‧ side panel

3211‧‧‧ hook

3212‧‧‧Detention Department

322‧‧‧Limited

3221‧‧‧ rail piece

4‧‧‧Shield housing

Claims (9)

An electrical connector includes a seat body, a movable seat and a positioning mechanism, wherein: the base body has a side arm extending in the same direction on both sides of the base, and a movable seat is formed between the two side arms and the base a sliding space for reciprocating displacement; a space for the external plug to be inserted between the bottom plate and the two side walls is formed, and a plurality of docking terminals are positioned on the bottom plate, and each side wall is provided with a blocking portion. The movable seat is combined with a positioning mechanism; the two side plates of the outer casing are provided with a rotating body pivotally connected to the shaft portion and the shaft portion, and a plug interface is formed between the rotating body and the outer casing. The inner side of the rotating body is provided with a limiting portion for holding and positioning the elastic buckle on the external plug, and the rotating body is located around the shaft portion to be provided with at least one hook that is rotated against the blocking portion. When the external plug is inserted into the docking space of the movable seat, a lateral predetermined distance can be formed at the periphery of the plug interface of the rotating body, and the front edge of the elastic buckle is not directly pushed on the front side surface of the rotating body. To prevent the rotating body from tipping and externally inserting One can plug in place. The electrical connector of claim 1, wherein a bottom portion of the sliding space of the base body is formed with a hollow portion, and a contact portion at a side of the plurality of mating terminals on the movable seat is located at the docking space, and is in contact with The soldering portion at the other side of the portion is extended from the docking space to the connecting unit that can be electrically connected to the preset transmission interface, and the connecting unit can be a flexible circuit board or a flexible planar cable. The electrical connector of claim 1, wherein one of the seats The inner side of the side arm is provided with a rail groove, and an elastic element is positioned between the seat body and the movable seat, and a guide rod is arranged on the side wall of the movable seat, and the other end of the guide rod is in a loop in the track groove. Move the position. The electrical connector of claim 1, wherein the movable seat has a positioning groove at a front side of the side wall, and the shaft portion of the outer casing of the positioning mechanism has a protruding post at the positioning groove, and the protruding column The sleeve is provided with a torsion spring, and a shaft hole pivotally connected to the protruding column is arranged at a lower end portion of the frame side plate of the rotating body, and the torsion spring on the protruding column is connected by the two end pins. The elastically supports the positioning groove and the frame of the movable seat respectively. The electrical connector of claim 1, wherein the docking space of the movable side of the rear side of the two side panels of the positioning mechanism outer body is a hanging space extending with a buckle portion for pushing the external plug The card body is formed on the opposite side of the rotating body, and a latching portion for the card body is laterally held in the latching portion for preventing the rotating body from falling when the external plug is inserted. The electrical connector of claim 5, wherein each of the outer casings of the outer casing has a relatively inwardly extending elastic arm and is outwardly folded by the end of the elastic arm for pushing the external plug. The top surface is bent from above the push top surface to form a buckle portion that is outwardly turned. The electrical connector of claim 6, wherein the side wall of the movable seat is provided with a stopper at a position behind the shaft portion of the positioning mechanism, and the elastic arm of the positioning mechanism is a stopper that passes over the side wall. At the inner side, the latching portion extends toward the elastic arm to form a resisting end of the stop against the side wall. The electrical connector of claim 5, wherein the fastening portion of the positioning mechanism body and the fastening portion of the rotating body are the corresponding buckles and buckles corresponding to the movable card. The electrical connector of claim 1, wherein the predetermined angle formed between the rotating body of the positioning mechanism and the movable seat is less than ninety degrees, and the outer plug end surface is aligned with the front end surface of the movable seat. A lateral predetermined distance is formed at a periphery of the insertion interface of the rotating body, and the predetermined distance is slightly larger than a lateral clamping distance formed by the end face of the plug to the leading edge of the elastic buckle.