Metallic middle plate and USB socket with positive and negative insertion

Abstract

A metal center plate and a USB socket with positive and negative insertion, the metal center plate comprises a plate body extending in the front-rear direction, a buckle part protruding from the lateral side of the front end of the plate body, and a reinforcing arm connected to the rear end of the plate body and extending in the lateral direction, the reinforcing arm exceeds the outer edge of the buckle part towards the lateral side. The metal center plate of the application can effectively simplify the manufacturing process and reduce the cost.

Description

Technical Field

[0001] This utility model relates to the field of electrical connectors, and more particularly to a metal middle plate and a reversible USB socket. Background Technology

[0002] Type-C USB sockets support reversible insertion and high-speed data transmission. A typical USB socket includes a first terminal group, a second terminal group, a metal plate at least between the high-speed signal terminals of the first and second terminal groups stacked vertically, an insulating body that holds the first and second terminal groups and the metal plate together, and a metal shell fitted over the insulating body. To adapt to some small-size applications, Chinese Patent CN118431835A discloses a simplified metal shell solution. This solution involves providing shielding plates for grounding and connecting to the USB plug on the upper and lower surfaces of the insulating body, extending the shielding plates rearward to form spot-welded portions, and then providing a metal shell fitted only at the rear end of the insulating body. The spot-welded portions are spot-welded to the metal shell to enhance the overall stability of the insulating body and the metal shell. This exposes the mating tongue and the covering portion of the insulating body outside the metal shell, allowing the external space of the mating tongue, originally occupied by the metal shell, to be utilized by the electronic device's housing, reducing the size of the electronic device. However, this solution, including the shielding plates and the metal shell, increases the complexity of components and assembly in practical applications. Chinese Patent CN218472375U discloses a reversible USB socket. To increase the strength of the insulating body's ear section, a metal reinforcement is integrally formed within the base of the insulating body. This metal reinforcement enhances the strength of the insulating body and its ear section, ensuring good strength when fixed to a printed circuit board. Utility Model Content

[0003] Therefore, it is necessary to provide a simple, cost-effective metal midplate and a reversible USB socket.

[0004] To solve the above-mentioned technical problems, this application provides a metal middle plate, including a plate body extending in a front-rear direction, a latching part protruding laterally from the front end of the plate body, and a reinforcing arm connected to the rear end of the plate body and extending laterally, wherein the reinforcing arm extends laterally beyond the outer edge of the latching part.

[0005] Preferably, the reinforcing arm has a fixed end at its lateral end, a first fixing hole is formed through the fixed end, a welding foot is formed by bending downward on the rear side of the reinforcing arm, and a welding end face is provided on the front side of the reinforcing arm.

[0006] Preferably, a narrowing portion is formed at the rear end of the plate, and the reinforcing arm is connected to the rear end of the narrowing portion, wherein the width of the narrowing portion is smaller than the width of the plate.

[0007] To address the aforementioned technical problems, this application also includes a reversible USB socket, comprising the aforementioned metal middle plate, a first terminal group and a second terminal group disposed on the upper and lower sides of the metal middle plate, and an insulating body that holds the first terminal group, the second terminal group and the metal middle plate together. The insulating body includes a wrapping portion, a mating tongue extending forward from the wrapping portion, and a tail portion located behind the wrapping portion. The plate extends longitudinally between the first terminal group and the second terminal group, the latching portion extends laterally outward and is exposed outside the insulating body, and the reinforcing arm is embedded in the tail portion.

[0008] Preferably, the first terminal group and the second terminal group each include a contact portion exposed on the upper and lower surfaces of the mating tongue, a wrapped portion extending rearward from the contact portion and being wrapped within the wrapping portion and the tail portion, and a welding portion formed by bending downward from the rear end of the wrapped portion. The welding portions of the first terminal group and the second terminal group are arranged in two rows in the transverse direction, with the welding portion of the upper first terminal group located behind the welding portion of the second terminal group. The surfaces of the welding portions of the first terminal group and the second terminal group are on the same horizontal plane. The first terminal group and the second terminal group each include a pair of ground terminals located on the outermost side, two pairs of high-speed signal terminals located inside the pair of ground terminals, a pair of power terminals located inside the two pairs of high-speed signal terminals, and a plurality of conventional signal terminals located between the pair of power terminals.

[0009] Preferably, the plate extends longitudinally between the high-speed signal terminals of the first terminal group and the second terminal group, the inner side of the reinforcing arm is located between the wrapped part of the first terminal group and the welded part of the second terminal group, a fixed end is formed at the lateral end of the reinforcing arm, a second fixing hole is formed through the fixed end, an ear is formed on the lateral outer side of the tail, a first fixing hole is formed through the ear, and the first fixing hole and the second fixing hole together constitute a fixing hole for fixing the USB socket with bolts.

[0010] Preferably, the latching portion extends laterally outward from the front end of the plate and passes through the middle of the first terminal group and the second terminal group, exposing the pair of grounding terminals outside the insulating body; the rear side of the reinforcing arm bends downward and extends to form a welding foot.

[0011] Preferably, the reversible USB socket further includes a shielding sleeve fitted over the outer portion of the insulating body. The shielding sleeve includes an annular wall, a through hole formed from front to back, and a folded portion formed by folding outward from the rear end of the annular wall. The front end face of the tail portion is provided with a supporting surface that abuts against the folded portion.

[0012] Preferably, the front end of the reinforcing arm is provided with a welding end face exposed on the front end surface of the tail, and the outer edge of the folded part extends to form a spot weld part that contacts the welding end face. The spot weld part and the welding end face are welded together by spot welding, and the shielding sleeve is grounded through the metal middle plate.

[0013] Preferably, the insulating body further includes an isolation section separating the wrapping part from the tail part. The wrapping part and the tail part are connected as a whole to the metal middle plate through the first terminal group, the second terminal group, and the shielding sleeve is arranged around the wrapping part and at least part of the isolation section. Waterproof adhesive is injected into the isolation section to bond the first terminal group, the second terminal group, the metal middle plate, and the inner surface of the annular wall exposed to the outside to a whole for waterproofing. The rear end of the plate body is provided with a narrowing part located in the isolation section. The reinforcing arm is connected to the rear end of the narrowing part. A sealing ring is installed or formed on the front side of the folded part of the shielding sleeve.

[0014] The metal middle plate and USB socket of this application form an integral reinforcing arm by extending the rear end of the metal middle plate directly. The reinforcing arm strengthens the tail of the insulating body and enhances the locking strength of the fixing hole. Compared with the traditional structure that requires a separate embedded metal sheet, this is simpler and lower in cost. Attached Figure Description

[0015] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0016] Figure 1 This is a perspective view of the reversible USB socket of this application;

[0017] Figure 2 This is a perspective view of the reversible USB socket of this application from another angle.

[0018] Figure 3 This is an exploded perspective view of the reversible USB socket of this application;

[0019] Figure 4 This is a partial exploded perspective view of the connector of the reversible USB socket of this application;

[0020] Figure 5 This is an exploded perspective view of the connector of the reversible USB socket of this application;

[0021] Figure 6 This is a perspective view of the metal middle plate of the reversible USB socket of this application;

[0022] Figure 7 This is a diagram showing the connection between the first terminal group, the second terminal group, and the metal middle plate of the reversible USB socket of this application;

[0023] Figure 8 This is a cross-sectional view of the reversible USB socket of this application along the metal middle plate in the XY plane;

[0024] Figure 9 This is a cross-sectional view of the reversible USB socket of this application along the high-frequency signal terminals in the XZ plane;

[0025] Figure 10 This is a cross-sectional view of the reversible USB socket of this application along the power terminals in the XY plane;

[0026] Figure 11 This is a cross-sectional view of the reversible USB socket of this application installed inside an electronic device.

[0027] Explanation of reference numerals in the attached figures

[0028] Shielding sleeve-10; Sealing ring-101; Waterproof adhesive-102; Annular wall-11; Through hole-12; Fold-up part-13; Annular groove-14; Protruding ring-15; Spot weld-16; Insulating body-20; Wrapping part-21; Butt tongue-22; Tail-up part-23; Ear-24; First fixing hole-241; Isolation section-25; Glue injection port-26; First plastic body-201; Second plastic body-202; Circumvention groove-29; Metal middle plate-30; Plate body-31; Thinning part-311; Narrowing part -312; Buckle part -32; Slot -33; Flow hole -34; Reinforcing arm -35; Fixed end -36; Second fixed hole -361; Welding foot -37; Welding end face -38; First terminal group -40; Second terminal group -50; Contact part -41; Enclosed part -42; Welding part -43; Recessed section -44; Grounding terminal -401; High-speed signal terminal -402; Power terminal -403; Conventional signal terminal -404; Equipment frame -60; USB hole -61; Rear end face -62. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings.

[0030] Please see Figure 1 As shown, this application uses a reversible USB socket. Figure 1The X direction is the front end of the longitudinal direction, the Y direction is the lateral direction, and the Z direction is the vertical direction.

[0031] Please see Figures 1 to 4 As shown, the reversible USB socket of this application includes a connector A, a shielding sleeve 10 sleeved outside the connector A, waterproof adhesive 102 filled inside the rear side of the shielding sleeve 10 and inside the connector A, and a sealing ring 101 sleeved on the outer periphery of the rear end of the shielding sleeve 10.

[0032] The shielding sleeve 10 includes an annular wall 11, a through hole 12 extending from the front to the rear, and a folded portion 13 formed by folding outward from the rear end of the annular wall 11. The outer diameter of the folded portion 13 is larger than the outer diameter of the annular wall 11. The folded portion 13 is formed by bending vertically outward from the rear end of the annular wall 11, and a convex ring 15 is formed by bending forward along the outer edge of the folded portion 13. An annular groove 14 is formed on the front side of the folded portion 13 between the convex ring 15 and the outer surface of the annular wall 11. A pair of spot welded portions 16 are formed by extending outward from both sides of the convex ring 15. The spot welded portions 16 have a plate-like structure.

[0033] Please continue reading. Figures 3 to 7 As shown, the connector A includes a first terminal group 40, a second terminal group 50 located below the first terminal group 40, a metal middle plate 30 located between the first terminal group 40 and the second terminal group 50, and an insulating body 20 that holds the first terminal group 40, the second terminal group 50 and the metal middle plate 30 together.

[0034] The insulating body 20 includes a wrapping portion 21 fitted into the through hole 12 of the shielding sleeve 10, a mating tongue 22 extending forward from the wrapping portion 21, a tail portion 23 formed behind the wrapping portion 21, ear portions 24 extending laterally from the tail portion 23, and an isolation section 25 separating the wrapping portion 21 and the tail portion 23. The upper side of the isolation section 25 extends rearward into the tail portion 23 to form an injection port 26 on the upper side of the tail portion 23, and the front end faces on both lateral sides of the tail portion 23 form abutting surfaces 27 that abut against the shielding sleeve 10. The ear portion 24 vertically penetrates to form a first fixing hole 241.

[0035] Please refer to this carefully. Figure 6 , Figure 7As shown, the first terminal group 40 and the second terminal group 50 include, along their length, a contact portion 41 exposed on the upper and lower surfaces of the mating tongue 22, a wrapped portion 42 extending rearward from the contact portion 41 and enclosed within the wrapping portion 21 and the tail portion 23, and a welding portion 43 formed by bending from the rear end of the wrapped portion 42. The first terminal group 40 and the second terminal group 50 each include a pair of ground terminals 401 located on the outermost side laterally, two pairs of high-speed signal terminals 402 located inside the pair of ground terminals 401, a pair of power terminals 403 located inside the two pairs of high-speed signal terminals 402, and a conventional signal terminal 404 located between the pair of power terminals 403. The width and thickness of the ground terminals 401 and the power terminals 403 are both greater than those of the high-speed signal terminals 402 and the conventional signal terminals 404.

[0036] Please refer to this carefully. Figure 6 As shown, the metal middle plate 30 includes a plate body 31 disposed between the high-speed signal terminals 402 of the first terminal group 40 and the second terminal group 50, a latching portion 32 extending laterally outward from the front end of the plate body 31 and passing over the grounding terminals 401, a latching groove 33 formed outside the latching portion 32 and exposed to the lateral outer side of the insulating body 20, a reinforcing arm 35 connected to the rear end of the plate body 31, and a fixing end 36 formed laterally outward of the reinforcing arm 35. The front end portion of the plate body 31 is thinned to form a thinning portion 311 to avoid the front end embedded portion of the high-speed signal terminal 402. The latching portion 32 has a flow hole 34 through which molten plastic flows. The reinforcing arm 35 extends outward in the lateral direction, and the fixing end 36 has a second fixing hole 261 through which it passes. The rear end of the reinforcing arm 35 is also bent downward to form a solder foot 37. The reinforcing arm 35 is integrally connected to the rear end of the plate 31 via a narrow constriction portion 312, which is located at the position of the isolation section 25. Simultaneously, the inner side of the reinforcing arm 35, located between the wrapped portion 41 of the first terminal group 40 and the soldered portion 43 of the second terminal group 50, continues to provide shielding to reduce crosstalk between the upper and lower rows of high-speed signal terminals 402. The reinforcing arm 35 is partially enclosed by the tail portion 23 of the insulating body 20, meaning the reinforcing arm 35 is embedded within the tail portion 23 to strengthen the insulating body 20. Specifically, the fixing end 36 is embedded within the ear portion 24 of the insulating body 20, and the second fixing hole 361 and the first fixing hole 241 together form a fixing hole for bolt insertion and locking. The reinforcing arm 35 has a welding end face 38 on its front end face near the fixed end 36. During the manufacturing process, the welding end face 38 can be used to connect the material strip. After injection molding, the material strip is cut off and the welding end face 38 is exposed outside the insulating body 20.

[0037] The grounding terminal 401 and power terminal 403 of the first terminal group 40 and the second terminal group 50 are partially recessed inward to form a concave section 44, so that the grounding terminal 401 and power terminal 403 of the first terminal group 40 and the grounding terminal 401 and power terminal 403 of the second terminal group 50 are in direct contact. At the same time, the outer surface of the concave section 44 is further inward than the outer surface of the contact portion 41. When the insulating body 20 is injection molded, the plastic will cover the concave section 44 so that it is not exposed outside the insulating body 20, thus avoiding the problem of electrolytic damage to the surface plating caused by sweat seeping into the conductive terminals.

[0038] Key references Figure 4 , Figure 5 As shown, the connector A further includes a first plastic body 201 that secures the first terminal group 40 and the metal middle plate 30 together, and a second plastic body 202 that secures the second terminal group 50 together. The first plastic body 201 and the second plastic body 202 are then stacked together and injection molded again to form the insulating body 20. The first plastic body 201 and the second plastic body 202, corresponding to the isolation section 25 of the insulating body 20, are also free of plastic material, allowing the first terminal group 40, the second terminal group 50, and the metal middle plate 30 to be exposed to the outside environment in this isolation section 25. The narrowed portion 312 of the metal middle plate 30 is located at the isolation section 25, and this narrowed portion 312 is exposed to the outside environment. The bottom surface of the tail portion 23 of the insulating body 20 is recessed upward to form a clearance groove 29. The clearance groove 29 is located at the welding portion 43 of the first terminal group 40 and the second terminal group 50. Specifically, after the ground plastic body 201 and the second plastic body 202 are stacked together, the welding portion 43 of the first terminal group 40 is arranged laterally at the rear end of the clearance groove 29, and the welding portion 43 of the second terminal group 50 is arranged laterally at the front side of the clearance groove 29. The surfaces of the welding portion 43 of the first terminal group 40 and the welding portion 43 of the second terminal group 50 are on the same horizontal plane for mounting and soldering onto a circuit board. The presence of the clearance groove 29 can reduce the overall thickness of the product and reduce its size.

[0039] Key references Figures 8 to 10As shown, after the connector A is manufactured, the shielding sleeve 10 is a seamless tube structure. The shielding sleeve 10 is inserted from the front into the wrapping portion 21 of the insulating body 20, and the rearward coverage of the shielding sleeve 10 includes at least a portion of the isolation section 25, so that at least a portion of the isolation section 25 is surrounded by the annular wall 11 of the shielding sleeve 10. The folded portion 13 of the shielding sleeve 10 abuts against the front end face of the tail portion 23 of the insulating body 20 for limiting its position. The spot weld portion 16 on the lateral outer side of the folded portion 13 overlaps with the welding end face 38 exposed on the front end face of the tail portion 23. The shielding sleeve 10 and the reinforcing arm 35 are welded and fixed together by spot welding from the front side.

[0040] To achieve good waterproof performance, waterproof adhesive 102 is injected from the injection port 26 at the tail 23 of the insulating body 20, so that the waterproof adhesive 102 fills the isolation section 25 surrounded by the annular wall 11 of the shielding sleeve 10, allowing the waterproof adhesive 102 to adhere to the portions of the first terminal group 40, the second terminal group 50, and the metal middle plate 30 located therein, and to the inner wall surface of the surrounding annular wall 11 to achieve waterproofing, preventing water from seeping in from the joint between the insulating body 20 and the conductive terminal groups 40, 50, and the metal middle plate 30. The narrow portion 312 of the metal middle plate 30 is also adhered by the waterproof adhesive 102. The waterproof adhesive forms a waterproof block after UV curing. A sealing ring 101 is provided on the front end face of the folded portion 13 of the shielding sleeve 10. The sealing ring 101 can be a pre-formed sealing ring directly fitted onto the shielding sleeve 10, or it can be formed by dispensing glue onto the front end face of the folded portion 13 of the shielding sleeve 10. The dispensing process is existing technology, that is, the USB socket is placed vertically, glue is dispensed around the folded portion 13 and then cured. It will not be described in detail here.

[0041] In one embodiment, the plate body 31 of the metal middle plate 30 and the reinforcing arm 35 can be separate structures, that is, the plate body 31 and the reinforcing arm 35 are independent parts. In practice, the reinforcing arm 35 can be a metal sheet, which is partially exposed at the front end of the tail 23 and welded to the spot weld portion 16 of the shielding sleeve 10. Alternatively, the reinforcing arm 35 is not actually a necessary technology, and its structure can be omitted. Instead, the rear end of the plate body 31 can extend laterally outward and adhere to the inner surface of the annular wall 11 and be welded to the annular wall 11.

[0042] Please see Figure 11As shown, this application also includes an electronic device, which includes a device frame 60, electronic components installed within the device frame 60, and a USB socket. The device frame 60 has a through-hole 61. The USB socket is installed within the electronic device, with its tongue 22 and cover portion 21 inserted into the USB hole 61. A sealing ring 101 is pressed against the rear end face 62 of the outer periphery of the USB hole 61 to achieve waterproofing. The USB socket is locked to a printed circuit board or an object within the electronic device via the fixing holes 241 and 361.

[0043] This application's reversible USB socket achieves waterproofing by placing a shielding sleeve 10 over the wrapping part 21 and the isolation section 25 and filling it with waterproof adhesive. The outer periphery of the shielding sleeve 10 is folded to form a folded part 13 to support the compression waterproofing between it and the device frame 50. This eliminates the need for a traditional metal shell, reducing the product size. At the same time, the base of the insulating body that originally needed to fix the metal shell is replaced by the isolation section, eliminating the base of the insulating body and greatly shortening the length of the USB socket. While ensuring waterproof performance, it reduces the product size, the number of components, and the manufacturing cost.

[0044] The metal middle plate 30 and USB socket of this application are formed by extending the rear end of the metal middle plate 30 directly to form an integral reinforcing arm 35. The reinforcing arm 35 strengthens the strength of the tail 23 of the insulating body 20 and the locking strength of the fixing holes 241 and 361. Compared with the traditional structure that requires a separate embedded metal sheet, it is simpler and lower in cost.

[0045] In one embodiment, this application is also applicable to other types of IO connectors, that is, other USB sockets besides Type C connectors, such as Micro USB sockets, etc. In this case, the first terminal group 40 and the second terminal group 50 are replaced by a single terminal group, collectively referred to as the conductive terminal group.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0047] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A metal middle plate, characterized in that, It includes a plate extending in a front-to-back direction, a latching part protruding laterally from the front end of the plate, and a reinforcing arm connected to the rear end of the plate and extending laterally, wherein the reinforcing arm extends laterally beyond the outer edge of the latching part.

2. The metal middle plate as described in claim 1, characterized in that, The reinforcing arm has a fixed end at its lateral end, and a first fixing hole is formed through the fixed end. The rear side of the reinforcing arm is bent downward to form a welding foot, and a welding end face is provided on the front side of the reinforcing arm.

3. The metal middle plate as described in claim 1, characterized in that, The plate has a narrowed section at its rear end, and the reinforcing arm is connected to the rear end of the narrowed section. The width of the narrowed section is smaller than the width of the plate.

4. A reversible USB socket, characterized in that, The device includes a metal middle plate as described in claim 1, a first terminal group and a second terminal group disposed on the upper and lower sides of the metal middle plate, and an insulating body that holds the first terminal group, the second terminal group and the metal middle plate together. The insulating body includes a wrapping portion, a mating tongue extending forward from the wrapping portion, and a tail portion located behind the wrapping portion. The plate extends longitudinally between the first terminal group and the second terminal group. The snap-fit ​​portion extends laterally outward and is exposed outside the insulating body. The reinforcing arm is embedded in the tail portion.

5. The reversible USB socket as described in claim 4, characterized in that, The first terminal group and the second terminal group each include a contact portion exposed on the upper and lower surfaces of the mating tongue, a wrapped portion extending rearward from the contact portion and being enclosed within the wrapping portion and the tail portion, and a welding portion formed by bending downward from the rear end of the wrapped portion. The welding portions of the first terminal group and the second terminal group are arranged in two rows in the transverse direction, with the welding portion of the upper first terminal group located behind the welding portion of the second terminal group. The surfaces of the welding portions of the first terminal group and the second terminal group are on the same horizontal plane. The first terminal group and the second terminal group each include a pair of ground terminals located on the outermost side, two pairs of high-speed signal terminals located inside the pair of ground terminals, a pair of power terminals located inside the two pairs of high-speed signal terminals, and a plurality of conventional signal terminals located between the pair of power terminals.

6. The reversible USB socket as described in claim 5, characterized in that, The plate extends longitudinally between the high-speed signal terminals of the first terminal group and the second terminal group. The inner side of the reinforcing arm is located between the wrapped part of the first terminal group and the welded part of the second terminal group. A fixed end is formed at the lateral end of the reinforcing arm. A second fixing hole is formed through the fixed end. An ear is formed by extending laterally outward from the tail. A first fixing hole is formed through the ear. The first fixing hole and the second fixing hole together constitute a fixing hole for fixing the USB socket with bolts.

7. The reversible USB socket as described in claim 6, characterized in that, The latching portion extends laterally outward from the front end of the plate and passes through the middle of the first terminal group and the second terminal group, exposing the pair of grounding terminals outside the insulating body; the rear side of the reinforcing arm bends downward and extends to form a welding foot.

8. The reversible USB socket as described in claim 6, characterized in that, The reversible USB socket also includes a shielding sleeve fitted over the outer part of the insulating body. The shielding sleeve includes an annular wall, a through hole formed from front to back, and a folded part formed by folding outward from the rear end of the annular wall. The front end face of the tail is provided with a supporting surface that abuts against the folded part.

9. The reversible USB socket as described in claim 8, characterized in that, The front end of the reinforcing arm is provided with a welding end face exposed on the front end surface of the tail. The outer edge of the folded part extends to form a spot weld part that contacts the welding end face. The spot weld part and the welding end face are welded together by spot welding. The shielding sleeve is grounded through the metal middle plate.

10. The reversible USB socket as described in claim 9, characterized in that, The insulating body also includes an isolation section that separates the wrapping part from the tail part. The wrapping part and the tail part are connected as a whole to the metal middle plate through the first terminal group, the second terminal group, and the shielding sleeve is arranged around the wrapping part and at least part of the isolation section. Waterproof glue is injected into the isolation section to bond the first terminal group, the second terminal group, the metal middle plate, and the inner surface of the annular wall exposed to the outside to a whole for waterproofing. The rear end of the plate body is provided with a narrowing part located in the isolation section. The reinforcing arm is connected to the rear end of the narrowing part. A sealing ring is installed or formed on the front side of the folded part of the shielding sleeve.

Images