Metal shell and USB socket

Abstract

A metal shell and a USB socket, the metal shell comprises a ring body, a cover plate and an extension arm which are formed by extending backwards from the top of the rear end of the ring body and the transverse side portion of the ring body respectively, an accommodating cavity defined by the cover plate and the extension arm, and a through hole which penetrates through the ring body front and back and is communicated with the accommodating cavity. The upper side and the lower side of the front end face of the ring body extend forwards respectively to form a pair of lap joint parts. The structure is simple, and the manufacturing cost is lower.

Description

Technical Field

[0001] The present application relates to the field of electrical connectors, and in particular to a metal housing and a USB socket. Background Art

[0002] Patent application number 202411024158.2 discloses a waterproof USB socket, comprising conductive terminals arranged in two rows, a shielding plate arranged between the two pairs of conductive terminals, a pair of shielding sheets respectively connected to the ground terminals of the two rows of conductive terminals, and an insulating body that holds the conductive terminals, shielding plates, and shielding sheets as a whole. The insulating body comprises a base, a wrapping portion extending forward from the base, a docking tongue extending forward from the wrapping portion, and a tail extending rearward from the base. The conductive terminals include a base exposed to the ground. The contact portion on the outer surface of the docking tongue, the wrapped portion extending backward from the contact portion and wrapped in the insulating body, and the welding foot extending backward from the wrapped portion out of the insulating body, the shielding sheet includes a lap portion, a spot welding portion formed by bending inward from the rear end of the lateral outer side of the lap portion and then extending horizontally, a bending portion is formed between the lap portion and the spot welding portion, the spot welding portion is adhered to the outer surface of the wrapped portion of the grounding terminal, spot-welded and electrically conductive, and the lap portion is exposed to the outer surface of the wrapped portion to contact and conduct with the corresponding component of the plug to achieve grounding.

[0003] The above-mentioned product requires the shielding sheet to be separately provided, and a spot welding process is added. At the same time, the number of parts that need to be molded increases, which increases the complexity of the injection molding process and easily leads to quality problems.

[0004] In addition, the conductive terminals of existing USB sockets are generally connected at both ends by material strips and then injection molded. As a result, the electroplating of the conductive terminals before injection molding cannot plate the front ends of the conductive terminals. After injection molding, the front ends of the conductive terminals are cut off and then embedded in the insulating body. However, the docking tongue is exposed to the outside. If sweat seeps into the insulating body, the front ends of the conductive terminals will corrode, posing a risk of fire during charging. Summary of the Invention

[0005] In view of this, it is necessary to provide a metal shell and a USB socket that are in direct contact with the plug to form a shielding loop.

[0006] In order to solve the above technical problems, the present application provides a metal shell, including a ring body, a covering plate and an extension arm extending backward from the top of the rear end and the lateral side of the ring body respectively, a accommodating cavity surrounded by the covering plate and the extension arm, and a through hole that passes through the ring body front and back and connects to the accommodating cavity, and a pair of overlapping parts are formed on the upper and lower sides of the front end surface of the ring body.

[0007] Preferably, the ring body includes an annular base and an outward-folding stop portion formed by folding outward from the rear end of the annular base, a pair of overlapping portions are formed by extending forward from the upper and lower sides of the front end of the annular base respectively, a pair of overlapping portions are not connected and closed on the lateral outside, and the through hole is located at the position of the outward-folding stop portion, the inner diameter width is enlarged and an inclined surface is formed.

[0008] Preferably, a front end surface of the outward-turned stopper is recessed to form an annular groove for accommodating a sealing ring.

[0009] Preferably, the extension arm and the cover plate are an integral structure, a pair of the extension arms include an insertion slot with an open rear end and a supporting step formed at the front end of the insertion slot, a welding protrusion is protruded from the bottom surface of the extension arm, and a limiting groove structure is provided on the rear end surface of the extension arm and the cover plate.

[0010] To solve the above technical problems, the present application also provides a USB socket, comprising the aforementioned metal shell and a connector inserted into the through hole of the metal shell, the connector comprising a first terminal group and a second terminal group arranged in two rows in a vertical direction, a middle plate placed between the first terminal group and the second terminal group, and an insulating body that holds the first terminal group, the second terminal group and the middle plate as a whole, the insulating body comprising a base, a docking tongue extending forward from the base, a tail located behind the base, and a partition located between the base and the tail, the base comprising an extended rear section adhered to the inner wall surface of the annular base and an extended front section extending forward from the front of the annular base, the overlapping portion adhered to the surface of the extended front section.

[0011] Preferably, the partition portion is surrounded by the annular base and the inclined surface and is injected with glue to form a waterproof seal. The waterproof glue bonds the first terminal group, the second terminal group and part of the middle plate and bonds to part of the inner wall surface of the annular base and the inclined surface.

[0012] Preferably, the tail portion is accommodated in the accommodating cavity, the extension arm and the cover plate are an integral structure, a pair of the extension arms include an insertion groove with an open rear end and a supporting step formed at the front end of the insertion groove, a welding protrusion is protruded on the bottom surface of the extension arm, and the two lateral ends of the tail portion protrude outward to form a positioning protrusion, the front end of the positioning protrusion forms a front positioning portion, and the rear end of the positioning protrusion forms a rear positioning portion, the rear positioning portion extends rearward beyond the rear end edge of the tail portion, the positioning protrusion is inserted into the insertion groove of the extension arm, and the front positioning portion is fixed on the supporting step at the front end of the insertion groove.

[0013] Preferably, the USB socket further includes a rear fixing plate, and a limiting groove structure is provided on the rear end surface of the extension arm and the cover plate. The rear fixing plate is limited on the limiting groove structure and is spot-welded to the metal shell, and the rear positioning portion of the positioning protrusion is fixed by the rear fixing plate.

[0014] Preferably, the metal shell further includes ears extending outward from the outer sides of the ring body and the extension arm, and the ears are provided with fixing holes. The metal shell is fixed to a printed circuit board or other objects through the ears and the fixing holes.

[0015] Preferably, a front end surface of the outward-turned stopper is recessed to form an annular groove for accommodating a sealing ring.

[0016] Preferably, the first terminal group and the second terminal group respectively include a contact portion exposed on the upper and lower surfaces of the docking tongue, a retaining portion extending backward from the contact portion and buried in the base and tail and connecting the base and tail, and a solder foot bent from the retaining portion.

[0017] The metal shell and the USB socket of the present application extend forward from the front end of the ring body to form an overlapping portion that overlaps the surface of the base of the insulating body. The overlapping portion is used to electrically contact the docking plug to realize a shielding path, thereby avoiding the problems of the prior art of separately embedding a shielding sheet in the insulating body and welding it to the metal shell, which causes complex processes and high manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A top view of the USB socket for this application;

[0020] Figure 2 This is an exploded perspective view of the USB socket for this application;

[0021] Figure 3 A perspective view of the metal casing of this application;

[0022] Figure 4 for Figure 3 A cross-sectional view taken along the dashed line BB shown;

[0023] Figure 5 A three-dimensional diagram of the connector of the USB socket of this application;

[0024] Figure 6 For the Figure 1 A cross-sectional view taken along the dashed line AA is shown;

[0025] Figure 7 This is a side cross-sectional view of the USB socket for this application;

[0026] Figure 8 A three-dimensional diagram of the mid-plate and strip structure of the USB socket of this application;

[0027] Figure 9 A perspective view of a first insulator being injected into the middle plate of the USB socket of the present application for the first time;

[0028] Figure 10 This is a three-dimensional diagram of the first terminal assembly of the USB socket of the present application connected to the first insulator;

[0029] Figure 11 This is a three-dimensional view of the USB socket of the present application after the first terminal assembly is formed on the first insulator and the first terminal assembly strip is removed;

[0030] Figure 12 This is a three-dimensional diagram of the second terminal assembly of the USB socket of the present application connected to the first insulator and the second insulator;

[0031] Figure 13 This is a three-dimensional view of the second terminal assembly of the USB socket of this application after injection molding and removal of the middle plate strip;

[0032] Figure 14 This is a three-dimensional diagram of the connector of the USB socket of this application after being installed in the metal shell.

[0033] Description of Reference Numerals

[0034] Metal housing 10; ring body 11; through hole 111; inclined surface 112; annular base 113; outward-turning stopper 114; annular groove 115; overlapping portion 12; covering plate 13; extension arm 14; insertion groove 141; supporting step 142; welding protrusion 143; limiting groove structure 144; ear 15; fixing hole 151; accommodating cavity 16; sealing ring 17; plug-in connector A; first terminal group 30; first terminal strip 31; second insulator 32; second positioning groove 321; second terminal group 20; ground terminal 201; high-frequency terminal 202; power terminal 203; low-frequency terminal 204; contact portion 21; fixed Holding portion-22; welding foot-23; second terminal strip-24; middle plate-40; plate body-41; bending baffle-411; through hole-412; snap portion-413; extension portion-42; welding foot-43; middle plate strip-44; first insulator-45; front end portion-451; rear end portion-452; supporting boss-453; limiting groove-454; flow hole-455; insulating body-50; base-51; extended rear section-511; extended front section-512; protruding fitting portion-513; docking tongue-52; tail-53; positioning protrusion-531; front positioning portion-532; rear positioning portion-533; partition portion-54; waterproof glue-60; rear fixing plate-70. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions and advantages of this application more clear, the technical solutions of this application will be described clearly and completely below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them.

[0036] This application is based on Figure 2 As shown, the X direction is the front of the longitudinal direction, the Y direction is the lateral direction, and the Z direction is the upper direction of the vertical direction.

[0037] See also Figures 1 to 5 See Figures 1 to 4 As shown, the USB socket of the present application includes a metal housing 10 and a connector A inserted into the metal housing 10. The connector A includes a first terminal group 30 and a second terminal group 20 arranged in two corresponding rows in a vertical direction, a middle plate 40 disposed between the first terminal group 30 and the second terminal group 20, a first insulator 45 separately formed on the middle plate 40 and electrically isolating the middle plate 40 from the first terminal group 30 and the second terminal group 20, and an insulating body 50 that integrally holds the first terminal group 30, the second terminal group 20, the middle plate 40, and the first insulator 45.

[0038] Key References Figure 3 、 Figure 4 As shown, the metal shell 10 includes a ring body 11, a lap portion 12 extending forward from the upper and lower sides of the front end edge of the ring body 11, a cover plate 13 and an extension arm 14 extending backward from the top and lateral sides of the rear end of the ring body 11, an ear portion 15 extending laterally outward from the ring body 11 and / or the extension arm 14, a through hole 111 formed by passing through the ring body 11 front and back, and an accommodating cavity 16 surrounded by the cover plate 13 and the extension arm 14 and connected to the through hole 111.

[0039] The ring body 11 includes an annular base 113 and an outward-folding stopper 114 formed by folding outward from the rear end of the annular base 113. A pair of overlapping portions 12 are formed by extending forward from the upper and lower sides of the front end of the annular base 113. The pair of overlapping portions 12 correspond to each other in the upper and lower directions and are not connected and closed on the outside. The distance between the pair of overlapping portions 12 is consistent with the upper and lower heights of the through hole 111 at the position of the annular base 113. The inner diameter width of the through hole 111 at the position of the outward-folding stopper 114 is increased and an inclined surface 112 is formed. The front end surface of the outward-folding stopper 114 is recessed to form an annular groove 115 for accommodating the sealing ring 17.

[0040] The extension arm 14 and the cover plate 13 are an integral structure, and a pair of the extension arms 14 include an insertion slot 141 with an open rear end and a supporting step 142 formed at the front end of the insertion slot 141. The insertion slot 141 is in communication with the accommodating cavity 16, and the upper and lower sides of the insertion slot 141 are at least partially covered. A welding protrusion 144 is protruded and formed on the bottom surface of the extension arm 14. A limiting slot structure 144 is provided on the rear end surface of the extension arm 14 and the cover plate 13. The limiting slot structure 144 is used to limit the rear fixing plate 70. The rear fixing plate 70 is clamped on the limiting slot structure 144 and fixed together with the metal shell 10 by spot welding. The limiting slot structure 144 uses a protruding and recessed structure to constitute a limiting function. The metal shell 10 of the present application is preferably manufactured by a powder metallurgy process, but in other embodiments, the metal shell 10 can also be formed by a sheet metal drawing process, that is, a seamless tube structure is formed by drawing to form a seamless portion.

[0041] Please continue reading Figures 2 to 9As shown, each of the first terminal group 30 and the second terminal group 20 includes a pair of grounding terminals 201 located on the outermost sides, two pairs of high-frequency terminals 202 located inside the pair of grounding terminals 201, a pair of power terminals 203 located inside the high-frequency terminals 202, and a plurality of low-frequency terminals 204 located between the power terminals 203. The grounding terminals 201, high-frequency terminals 202, power terminals 203, and low-frequency terminals 204 are collectively referred to as conductive terminals. Each conductive terminal includes a contact portion 21, a retaining portion 22 extending rearward from the contact portion 21, and a solder foot 23 extending rearward from the retaining portion 22.

[0042] Key References Figure 8 As shown, the middle plates 40 are independent structures, one on each side. Each middle plate 40 includes a plate body 41, an extension 42 extending rearward from the plate body 41, and a welding leg 43 bent downward from the rear end of the extension 42. The plate body 41 includes a bent baffle 411 bent upward or downward from the front edge of the plate body 41, a through hole 412 extending through the plate body 41, and a snap portion 413 formed on the lateral outer side of the plate body 41. The pair of middle plates 40 are connected together by a middle plate material strip 44. The middle plate material strip 44 is connected to the lateral outer sides of the plate body 41 and the extension 42 to maintain the front and rear balance of the middle plates 40. The middle plate material strip 44 surrounds the outer periphery of the middle plates 40.

[0043] Please refer to Figure 5 As shown, the insulating body 50 includes a base 51, a docking tongue 52 extending forward from the base 51, a tail 53 located at the rear of the base 51, and a partition 54 separating the base 51 from the tail 53. The base 51 includes an extended rear section 511 located at the rear and an extended front section 512 located at the front. The extended rear section 511 protrudes outwardly on the lateral side to form a protruding fitting portion 513. The tail 53 and the base 51 are connected as a whole only through the first terminal group 30, the second terminal group 20 and the middle plate 40 to form the partition 54. Positioning protrusions 531 are formed on both lateral ends of the tail 53 extending in the front-to-back direction. The positioning protrusions 531 include a front positioning portion 532 and a rear positioning portion 533. The rear positioning portion 533 extends rearward beyond the rear end surface of the tail 53.

[0044] The outer surfaces of the contact portions 21 of the first terminal group 30 and the second terminal group 20 are respectively exposed to the upper and lower surfaces of the docking tongue 52 . The retaining portion 22 is embedded in the insulating body 50 and extends from the base 51 to the outside of the tail 53 . The solder foot 23 is formed by bending and extending from the retaining portion 22 .

[0045] Key References Figure 6 、 Figure 7 As shown, the connector A of the present application is inserted into the through hole 111 of the metal shell 10 from back to front. At this time, the extended rear section 511 of the base 51 is attached to the inner surface of the annular base 113 of the ring body 11, including the protruding fitting portion 513 attached to the arc-shaped inner surfaces on both sides of the annular base 113. The extended front section 512 extends out in front of the annular base 113, and the upper and lower surfaces of the extended front section 512 are covered by the overlapping portion 12. The partition portion 54 is surrounded in the ring body 11, that is, the partition portion 54 is surrounded by part of the annular base 113 and the inclined surface 112. The tail portion 53 is accommodated in the accommodating cavity 16. The positioning protrusions 531 on both lateral sides of the tail portion 53 are inserted into the insertion slot 141 of the extension arm 14. The front positioning portions 532 of the positioning protrusions 531 abut against the abutting steps 142 of the insertion slot 141, and the rear positioning portions 533 do not extend beyond the rear end edge of the extension arm 14. The rear fixing plate 70 is inserted into the limiting groove structure 144 behind the cover plate 13 and the extension arm 14 and fixed by spot welding. The rear positioning portions 533 of the positioning protrusions 531 are fixed in position by the rear fixing plate 70.

[0046] Waterproof glue 60 is injected from the lower side of the accommodating cavity 16, filling the area around the partition 54 with the waterproof glue 60 to form a waterproof layer. Specifically, the glue bonds the first terminal group 30, the second terminal group 20, the middle plate 40, and the inner surface of the ring body 11 to form a waterproof structure. The cured glue forms waterproof glue 60, which bonds a portion of the annular base 113 to the inner surface of the inclined surface 112. The sealing ring 17 can be sleeved within the annular groove 115 of the outward-turned retaining portion 114, or can be integrally formed within the annular groove 115 by dispensing glue. The sealing ring 17 and the waterproof glue 60 at least partially overlap in cross section.

[0047] The metal shell 10 of the present application and the USB socket extend forward from the front end of the ring body 11 to form an overlapping portion 12 that overlaps the surface of the base 51 of the insulating body 50. The overlapping portion 12 is used to electrically contact the docking plug to realize a shielding path, thereby avoiding the problems of the prior art of needing to separately embed a shielding sheet in the insulating body 50 and weld it to the metal shell 10, which causes complex processes and high manufacturing costs.

[0048] The manufacturing method of the USB socket of the present application will be Figures 8 to 14 The manufacturing method of the USB socket of the present application comprises the following steps:

[0049] S10 : providing a middle plate 40 connected with a middle plate strip 44 , and forming a first insulator 45 on the middle plate 40 by injection molding.

[0050] The middle plate strip 44 is connected to the middle plate 40 at two front and rear positions on the lateral outer side of the middle plate 40 to keep the middle plate 40 balanced; the first insulator 45 combines a pair of the middle plates 40 together, and the first insulator 45 includes a front end portion 451 and a rear end portion 452, and a plurality of supporting bosses 453 are protruding from the upper and lower surfaces of the front end portion 451, and a plurality of limiting grooves 454 are respectively formed on the upper and lower surfaces of the rear end portion 452, and the supporting bosses 453 correspond to the limiting grooves 454, and the supporting bosses 453 are used to support the contact portions 21 of the first terminal group 30 and the second terminal group 20, and the limiting grooves 454 are used for the retaining portions 22 of the first terminal group 30 and the second terminal group 20 to be clamped and limited. The function of the supporting bosses 453 and the limiting grooves 454 is to prevent the first terminal group 30 and the second terminal group 20 from being positioned during injection molding, and to prevent the conductive terminals from shifting. A flow hole 455 is further defined between the front end 451 and the rear end 452 of the first insulator 45 to facilitate the flow of plastic in subsequent processes.

[0051] S20, fix the first terminal group 30 connected to the first terminal strip 31 and the second terminal group 20 connected to the second terminal strip 24 on the lower surface and the upper surface of the first insulator 45 respectively, injection mold the insulating body 50 and obtain the plug-in component A, and cut off the first terminal strip 31 and the middle plate strip 44 after molding.

[0052] This step includes two implementation methods. One method is to simultaneously fix the first terminal group 30 and the second terminal group 20 on both side surfaces of the insulating body 50 to perform injection molding of the insulating body.

[0053] Another implementation includes the following two sub-steps:

[0054] S201 , fixing the first terminal group 30 connected with the first terminal strip 31 on the lower surface and the upper surface of the first insulator 45 , and injection-molding the second insulator 32 , and cutting off the first terminal strip 31 after molding.

[0055] In this step, the contact portion 21 of each conductive terminal of the first terminal group 30 is supported on the supporting boss 453, and the retaining portion 22 is clamped in the limiting groove 454 to keep the conductive terminals of the first terminal group 30 in a predetermined position under the impact of the molten plastic.

[0056] The first terminal strip 31 is connected to the solder foot 23 at the rear end of the first terminal group 30. The first terminal strip 31 is adhered and fixed to the middle plate strip 44. The front end of the contact portion 21 of the first terminal group 30 is not connected to the first terminal strip 31, so that when the first terminal group 30 is electroplated, the front end surface of the contact portion 21 is electroplated and will not be unable to be electroplated due to the connecting strip.

[0057] The second insulator 32 is fixed to the extension portion 42 of the middle plate 40 at the rear end of the fixing portion 22 as a whole. An auxiliary limiting groove 321 is formed on the upper surface of the second insulator 32 .

[0058] S202 , fixing the second terminal assembly 20 connected with the second terminal strip 24 to the upper side of the insulating body 50 and the first insulator 45 , performing injection molding on the insulating body 50 , and cutting off the middle plate strip 44 after molding.

[0059] In this step, the contact portion 21 of each conductive terminal of the second terminal group 20 is supported on the supporting boss 453, and the retaining portion 22 is clamped in the limiting groove 454 and the auxiliary limiting groove 321 to keep the conductive terminals of the second terminal group 20 in the predetermined position unchanged under the impact of the molten plastic.

[0060] The second terminal strip 24 is connected to the solder foot 23 at the rear end of the second terminal group 20. The second terminal strip 24 is adhered and fixed to the middle plate strip 44. The front end of the contact portion 21 of the second terminal group 20 is not connected to the second terminal strip 24, so that when the second terminal group 20 is electroplated, the front end surface of the contact portion 21 is electroplated and will not be unable to be electroplated due to the connecting strip.

[0061] Finally, the middle plate strip 44 surrounding the outer periphery of the connector A is cut off, and the first terminal strip 24 of the first terminal group 20 is retained. The first terminal strip 24 is only located behind the solder pin 23 .

[0062] S30, providing the metal shell 10, inserting the connector A into the metal shell 10 from the back to the front, providing a rear fixing plate 70, and welding the rear fixing plate 70 to the rear end surface of the metal shell 10 to restrict the connector A from withdrawing.

[0063] S40 , injecting glue into the partition portion 54 of the insulating body 50 surrounded by the ring body 11 of the metal shell 10 to form a waterproof glue 60 , and cutting off the first terminal strip 24 to obtain a finished product.

[0064] The manufacturing method of the USB socket of the present application connects the first terminal strip 31 and the second terminal strip 24 only to the solder pins 23 at the rear ends of the first terminal group 30 and the second terminal group 20, so that the front ends of the first terminal group 30 and the second terminal group 20 can be electroplated and wrapped, thereby reducing the risk of electrochemical corrosion and fire caused by exposure of the front ends of the conductive terminals.

[0065] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above embodiments merely represent preferred embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A metal housing comprising a ring body, a cover plate and an extension arm extending rearward from the top rear end and lateral sides of the ring body, a receiving cavity enclosed by the cover plate and the extension arm, and a through hole extending through the ring body and communicating with the receiving cavity, characterized in that: The upper and lower sides of the front end surface of the ring body extend forward to form a pair of overlapping parts.

2. The metal housing according to claim 1, wherein: The ring body includes an annular base and an outward-folding stopper formed by folding outward from the rear end of the annular base. A pair of overlapping portions are formed by extending forward from the upper and lower sides of the front end of the annular base respectively. The lateral outer sides of the pair of overlapping portions are not connected and closed. The inner diameter width of the through hole is increased at the position of the outward-folding stopper and an inclined surface is formed.

3. The metal housing according to claim 2, wherein: The front end surface of the outward-turned stopper is recessed to form an annular groove for accommodating a sealing ring.

4. The metal housing according to claim 2, wherein: The extension arm and the cover plate are an integral structure. A pair of the extension arms include an insertion slot with an open rear end and a supporting step formed at the front end of the insertion slot. A welding protrusion is protruded on the bottom surface of the extension arm, and a limiting groove structure is provided on the rear end surface of the extension arm and the cover plate.

5. A USB socket, characterized in that: It includes the metal shell as described in claim 2 and a connector inserted into the through hole of the metal shell, the connector including a first terminal group and a second terminal group arranged in two rows in the vertical direction, a middle plate placed between the first terminal group and the second terminal group, and an insulating body that holds the first terminal group, the second terminal group and the middle plate as a whole, the insulating body including a base, a docking tongue extending forward from the base, a tail located behind the base and a partition located between the base and the tail, the base including an extended rear section attached to the inner wall surface of the annular base and an extended front section extending forward from the front of the annular base, and the overlapping portion attached to the surface of the extended front section.

6. The USB socket according to claim 5, wherein: The partition portion is surrounded by the annular base and the inclined surface and is injected with glue to form a waterproof seal. The waterproof glue bonds the first terminal group, the second terminal group and a part of the middle plate and bonds to part of the inner wall surface of the annular base and the inclined surface.

7. The USB socket according to claim 6, wherein: The tail portion is accommodated in the accommodating cavity, the extension arm and the cover plate are an integral structure, a pair of the extension arms include an insertion groove with an open rear end and a supporting step formed at the front end of the insertion groove, a welding protrusion is protruded on the bottom surface of the extension arm, and positioning protrusions are formed at both ends of the tail portion protruding outward, the front end of the positioning protrusion forms a front positioning portion, and the rear end of the positioning protrusion forms a rear positioning portion, the rear positioning portion extends rearward beyond the rear end edge of the tail portion, the positioning protrusion is inserted into the insertion groove of the extension arm, and the front positioning portion is fixed on the supporting step at the front end of the insertion groove.

8. The USB socket according to claim 7, wherein: The USB socket also includes a rear fixing plate. A limiting groove structure is provided on the rear end surfaces of the extension arm and the cover plate. The rear fixing plate is limited on the limiting groove structure and is spot-welded to the metal shell. The rear positioning portion of the positioning protrusion is fixed by the rear fixing plate.

9. The USB socket according to claim 8, wherein: The metal shell further includes ears extending outward from the outer sides of the ring body and the extension arm. The ears are provided with fixing holes. The metal shell is fixed to a printed circuit board or other objects through the ears and the fixing holes.

10. The USB socket according to claim 5, wherein: The front end surface of the outward-turned stopper is recessed to form an annular groove for accommodating a sealing ring.

11. The USB socket according to claim 5, wherein: The first terminal group and the second terminal group respectively include a contact portion exposed on the upper and lower surfaces of the docking tongue, a holding portion extending backward from the contact portion and embedded in the base and tail and connecting the base and tail, and a solder foot bent from the holding portion.

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