Ring support and mobile phone shell comprising same

Abstract

The ring support comprises a base, a supporting ring and an elastic ring, an annular protrusion is arranged on the base, one side of the supporting ring is hinged to the base, the supporting ring can surround the periphery of the annular protrusion, one side of the elastic ring is arranged on the inner wall of the annular protrusion, and the other side of the elastic ring is hinged to the base. And the elastic ring can be accommodated in the space of the annular convex enclosure wall. The base can be installed on a back plate of a mobile phone shell, when a user needs to watch a video or carry out a video call, the supporting ring can be turned over and opened from the base, the turned and opened supporting ring can obliquely support the mobile phone shell and a mobile phone, fingers of the user can hook and hold the elastic finger ring, the user can operate the mobile phone with one hand more easily, and the user experience is improved. The finger ring support is simple in structure and not easy to fall off when a mobile phone is collided by an external object, even if the finger hooks and holds the elastic finger ring for a long time, aching pain cannot be caused, and the finger ring support not only can support the mobile phone, but also can enable a user to hook and hold the elastic finger ring for a long time, and aching pain cannot be caused.

Description

Technical Field

[0001] The utility model relates to a finger ring bracket and a mobile phone shell comprising the same. Background Art

[0002] With the update and iteration of mobile phones, more and more styles of mobile phone cases have come into being. Many mobile phone cases are designed with rotatable or flippable rings on the back panels, allowing users to easily adjust the viewing angle of the phone. This is very suitable for watching videos or making video calls. The fingers can also be hooked on the rings, making it easier for users to operate the phone with one hand, and the phone is not likely to fall when hit by foreign objects.

[0003] The finger ring on the existing mobile phone case is made of hard material (such as hard plastic or stainless steel) to achieve the function of supporting the mobile phone to adjust the viewing angle of the mobile phone. If the finger ring is hooked with a finger, the finger will be stuck and very painful over a long period of time. However, if the finger ring is made of flexible material, the function of supporting the mobile phone cannot be achieved.

[0004] Therefore, it is very necessary to study and design a ring stand that can support a mobile phone and allow a user to hold the ring for a long time without pain, and a mobile phone case containing the same. Utility Model Content

[0005] The purpose of the utility model is to provide a finger ring bracket and a mobile phone case containing the same, so as to solve at least one of the above technical problems.

[0006] According to one aspect of the utility model, there is provided a finger ring bracket, comprising:

[0007] A base for mounting on a mobile phone case, wherein the base is provided with an annular protrusion;

[0008] A support ring, one side of which is hinged to the base, and the support ring can surround the periphery of the annular protrusion; and

[0009] An elastic finger ring, one side of which is arranged on the inner wall of the annular protrusion, and the elastic finger ring can be accommodated in the space of the surrounding wall of the annular protrusion.

[0010] The base of the finger ring bracket of the utility model can be installed on the back plate of the mobile phone case. When the user needs to watch a video or make a video call, the support ring can be flipped open from the base. The flipped and opened support ring can tilt to support the mobile phone case and the mobile phone, and the user can watch videos or make video calls very conveniently. When the support ring is not in use, the surrounding wall of the support ring can be placed on the outer periphery of the annular protrusion to complete the closed storage of the support ring, and the user's finger can hook and hold the elastic finger ring, which makes it easier for the user to operate the mobile phone with one hand, and the mobile phone is not easy to fall when foreign objects collide with it. When the elastic finger ring is not in use, the elastic finger ring can be accommodated in the space of the surrounding wall of the annular protrusion, and the normal use of the mobile phone case is not affected. Because the elastic finger ring is elastic and is made of non-hard material, even if the finger hooks and holds the elastic finger ring for a long time, there will be no soreness. The finger ring bracket of the utility model can not only realize the function of supporting the mobile phone, but also allow the user to hook and hold the elastic finger ring for a long time without soreness, which can bring a very good experience to the user.

[0011] In some embodiments, a convex buckle may be provided on the inner wall of the support ring, and a slot adapted to the convex buckle may be provided on the outer wall of the annular protrusion.

[0012] When the supporting ring surrounding wall is at the periphery of the annular protrusion, the convex buckle can be snapped into the snap groove.

[0013] Thus, through the snap-fitting cooperation between the protrusion and the snap-fitting groove, the support ring can be firmly surrounded by the periphery of the annular protrusion and will not be easily flipped open when no external force is applied.

[0014] In some embodiments, a concave cavity may be provided on the inner wall of the annular protrusion, and a mounting portion is provided on one side of the elastic finger ring, and the free end of the mounting portion is clamped in the concave cavity.

[0015] Thus, the elastic finger ring can be stably mounted on the inner wall of the annular protrusion through the mounting portion, and when the elastic finger ring is not in use, the elastic finger ring can be accommodated in the space surrounding the annular protrusion without affecting the normal use of the mobile phone case.

[0016] In some embodiments, the other side of the support ring may be provided with a clip, so that the support ring can be easily flipped open from the base through the clip.

[0017] In some embodiments, a hinge portion may be provided on the base, one side of the support ring is hinged on the hinge portion, and notches are provided at both ends of the hinge portion on the base.

[0018] When the support ring is in an open state, the position of the support ring close to the hinge portion can be accommodated in the notch portion.

[0019] Therefore, the presence of the notch can prevent the support ring from interfering with the base when the support ring is in the open state, and the notch can provide an escape space for the opened support ring.

[0020] According to another aspect of the utility model, a mobile phone case is provided, comprising a mobile phone case body and a finger ring bracket, wherein the base is arranged on the back plate of the mobile phone case body.

[0021] The mobile phone case of the present invention can be flipped open by the user from the base when the user needs to watch a video or make a video call, and the flipped open support ring can tilt to support the mobile phone case and the mobile phone, so that the user can watch videos or make video calls very conveniently. When the support ring is not in use, the surrounding wall of the support ring can be placed on the outer periphery of the annular protrusion to complete the closed storage of the support ring, and the user's fingers can hook and hold the elastic finger ring, making it easier for the user to operate the mobile phone with one hand, and the mobile phone is not easy to fall when foreign objects collide with it. When the elastic finger ring is not in use, the elastic finger ring can be accommodated in the space of the surrounding wall of the annular protrusion, and does not affect the normal use of the mobile phone case. Since the elastic finger ring is elastic and is made of non-hard material, even if the fingers hook and hold the elastic finger ring for a long time, there will be no soreness. The mobile phone case of the present invention can not only realize the function of supporting the mobile phone, but also allow the user to hook and hold the elastic finger ring for a long time without soreness, which can bring a very good experience to the user.

[0022] In some embodiments, a receiving cavity may be provided on the back plate, a circle of grooves is provided on the inner wall of the receiving cavity, a plurality of protrusions arranged in an annular pattern are provided on the inner bottom of the receiving cavity, the periphery of the base is accommodated in the groove, the base can rotate in the receiving cavity, and a plurality of pits arranged in an annular pattern that are adapted to the protrusions are provided on the bottom of the base, and the protrusions are accommodated in the pits. Thus, due to the cooperation between the periphery of the base and the grooves on the inner wall of the receiving cavity, the base can rotate 360 ​​degrees in the receiving cavity, and due to the cooperation between the protrusions in the receiving cavity and the pits on the base, during the rotation of the base, each pit on the base will be accommodated and matched with the protrusions arranged in an annular pattern one by one, and when the base stops rotating, each protrusion in the receiving cavity is still accommodated in the pit on the base, so that after the external force for rotating the base is withdrawn, the base will not rotate easily, thereby realizing the angle adjustment of the support ring, and the base and the support ring can be adjusted at any angle in the receiving cavity, so that the user can adjust the angle and direction of the mobile phone by adjusting the angle of the support ring according to the use requirements, which is very convenient.

[0023] In some embodiments, the number of convex points and concave pits can be the same, and different convex points are respectively accommodated in different concave pits. Therefore, the convex points arranged in a ring and the concave pits arranged in a ring can be accommodated one by one, and when the base is rotated to any angle, each convex point in the accommodating cavity is still accommodated in a corresponding concave pit on the base, and after the external force for rotating the base is removed, the base will not rotate easily, thereby achieving any angle adjustment of the support ring on the back plate of the mobile phone case.

[0024] In some embodiments, a through hole may be provided on the base, the annular raised wall is on the periphery of the through hole, a raised portion is provided on the inner bottom of the accommodating cavity, the raised portion is accommodated in the through hole, a plurality of indicator lines arranged in an annular pattern are provided on the raised portion, the number of the indicator lines is the same as the number of the convex points, different indicator lines point to different convex points, and an indicator arrow is provided on the annular convex portion. Thus, when the user rotates the base, the indicator arrow can be compared with the indicator lines on the raised portion (e.g., the number of indicator lines is 36 and evenly distributed), so as to know the specific angle value of the rotation of the base and the support ring.

[0025] In some embodiments, when the support ring is in an open state, the portion of the support ring near the hinged position with the base can abut against the inner wall of the accommodating cavity. Thus, the inner wall of the accommodating cavity can limit the maximum angle of the support ring to be flipped open, ensuring that the support ring can stably support the mobile phone after being fully flipped open. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a finger ring bracket according to one embodiment of the present utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the finger ring bracket in which the support ring is in an open state is shown;

[0028] Figure 3 for Figure 1 A side view of the finger ring stand is shown;

[0029] Figure 4 This is a schematic structural diagram of a mobile phone case according to one embodiment of the utility model;

[0030] Figure 5 for Figure 4 The schematic diagram of the disassembled structure of the mobile phone case shown;

[0031] Figure 6 for Figure 4 The schematic diagram of the structure of the mobile phone case shown is a support ring in an open state. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0034] Figures 1 to 3 The structure of a finger ring bracket according to an embodiment of the utility model is schematically shown.

[0035] refer to Figures 1 to 3 A finger ring stand comprises a base 1, a support ring 2 and an elastic finger ring 3.

[0036] The base 1 is used to be installed on the mobile phone case, mainly on the back plate of the mobile phone case, refer to Figures 1 to 3 The outer edge of the base 1 is generally circular, and an annular protrusion 11 is formed on the base 1. The annular protrusion 11 is located in the middle of the base 1. A convex hinge portion 13 is formed on the base 1. One side of the support ring 2 is installed on the hinge portion 13 through a rotating shaft to realize the hinge connection between the support ring 2 and the hinge portion 13. The support ring 2 can be flipped open on the hinge portion 13 ( Figure 2 shown) and closed ( Figure 1 The state shown), when the support ring 2 is in a closed state, the surrounding wall of the support ring 2 is on the periphery of the annular protrusion 11, the support ring 2 can be disconnected at the hinge 13, the hinge 13 is accommodated in the disconnected position on the support ring 2, and then a rotating shaft is used to intersperse and install the support ring 2 and the hinge 13 together, the rotating shaft and the support ring 2 can be fixedly connected, and the rotating shaft and the hinge 13 can be interference fit, so that the support ring 2 can hover at any position when flipping and punching to realize the support function.

[0037] refer to Figure 3 Notches 14 are formed at both ends of the hinge 13 on the base 1. In this way, when the support ring 2 is in an open state, the position of the support ring 2 close to the hinge 13 can be accommodated in the notch 14. The existence of the notch 14 can prevent the support ring 2 from interfering with the base 1 when the support ring 2 is in an open state, and the notch 14 can provide an escape space for the opened support ring 2.

[0038] refer to Figure 2, a convex buckle 21 is provided on the inner wall of the support ring 2, and a slot 12 adapted to the convex buckle 21 is formed on the outer wall of the annular protrusion 11. When the support ring 2 surrounds the periphery of the annular protrusion 11, the convex buckle 21 is snapped into the slot 12. Through the snap-fitting of the convex buckle 21 and the slot 12, the support ring 2 can be firmly surrounded by the periphery of the annular protrusion 11, and will not be easily flipped open when not subjected to external force. In this embodiment, the number of the convex buckles 21 is two, and the number of the slots 12 on the outer wall of the annular protrusion 11 is also two. The two slots 12 are respectively adapted to the two convex buckles 21. In this way, through the snap-fitting of the two convex buckles 21 and the two slots 12, it can be ensured that the support ring 2 is firmly surrounded by the periphery of the annular protrusion 11.

[0039] refer to Figure 1 and Figure 2 A clip 22 is formed on the support ring 2. The clip 22 and the hinge seat 13 are located on opposite sides of the support ring 2. The support ring 2 can be easily flipped open from the base 1 through the clip 2.

[0040] refer to Figure 1 and Figure 2 One side of the elastic finger ring 3 is fixed on the inner wall of the annular protrusion 11. In the natural state, the elastic finger ring 3 is accommodated in the space surrounding the annular protrusion 11 ( Figure 1 For details, refer to Figure 3 The cam 31 is provided on the inner wall of the annular protrusion 11, and a mounting portion 31 is formed on one side of the elastic finger ring 3. The free end of the mounting portion 31 is clamped in the concave cavity 111, and the free end of the mounting portion 31 can be mounted in the concave cavity 111 through an axis component, the axis component is inserted in the free end of the mounting portion 31, and the two ends of the axis component are respectively inserted in the two opposite side walls of the concave cavity 111; when the base is mounted on the back plate of the mobile phone case, the user's fingers can hook the elastic finger ring 3, making it easier for the user to operate the mobile phone with one hand, and the mobile phone is not easy to fall when foreign objects collide with it. When the elastic finger ring 3 is not in use, the elastic finger ring 3 can be accommodated in the space of the surrounding wall of the annular protrusion 11 and does not protrude from the top of the annular protrusion 11, which does not affect the normal use of the mobile phone case, that is, when the mobile phone case is placed on the desktop, the back plate of the mobile phone case will not be tilted due to the elastic finger ring 3.

[0041] The elastic finger ring 3 is elastic and made of soft material, such as silica gel or rubber.

[0042] The finger ring bracket of the utility model has a base 1 which can be installed on the back plate of a mobile phone case. When a user needs to watch a video or make a video call, the support ring 2 can be flipped open from the base 1 through the clip 22. The flipped open support ring 2 can tilt to support the mobile phone case and the mobile phone, so that the user can watch videos or make video calls very conveniently. When the support ring 2 is not in use, the surrounding wall of the support ring 2 can be placed on the periphery of the annular protrusion 11 to complete the closed storage of the support ring 2, and the user's finger can hook and hold the elastic finger ring 3, so that the user can more easily operate the mobile phone with one hand, and the mobile phone is not easy to fall when an external object collides with the mobile phone. When the elastic finger ring 3 is not in use, the elastic finger ring 3 is accommodated in the space of the surrounding wall of the annular protrusion 11. Since the elastic finger ring 3 is elastic and is made of non-hard material, even if the finger hooks and holds the elastic finger ring 3 for a long time, there will be no soreness. The finger ring bracket of the utility model can not only realize the function of supporting the mobile phone, but also allow the user to hook and hold the elastic finger ring 3 for a long time without soreness, which can bring a very good experience to the user.

[0043] Figures 4 to 6 The structure of a mobile phone case according to one embodiment of the utility model is schematically shown.

[0044] refer to Figures 4 to 6 , a finger ring stand, comprising a mobile phone case body 4 and the above-mentioned finger ring stand.

[0045] The base 1 is mounted on the back plate 41 of the mobile phone case body 4. For details, refer to Figure 5 A concave accommodating cavity 42 is formed on the back plate 41. The cross section of the accommodating cavity 42 is circular to match the shape of the base 1. A circle of grooves 421 are formed on the inner wall of the accommodating cavity 42. The grooves 421 are formed by the inner wall of the accommodating cavity 42 being concave at its root. The periphery of the base 1 is accommodated in the grooves 421. The thickness of the periphery of the base 1 is slightly smaller than the height of the grooves 421. In this way, the base 1 can rotate in the accommodating cavity 42 without falling out.

[0046] refer to Figure 5 A plurality of protrusions 422 arranged in a ring shape are formed on the inner bottom of the accommodating cavity 42. Figure 3, a plurality of annularly arranged pits 15 adapted to the convex points 422 are formed on the bottom of the base 1, and the convex points 422 are accommodated in the pits 15, and the number of the convex points 422 and the pits 15 is the same, and each convex point 422 is correspondingly accommodated in a different pit 15, and the convex points 422 and the pits 15 are accommodated and matched one by one; due to the cooperation between the periphery of the base 1 and the grooves 421 on the inner wall of the accommodating cavity 42, the base 1 can rotate 360 ​​degrees in the accommodating cavity 42, and due to the cooperation between the convex points 422 in the accommodating cavity 42 and the pits 15 on the base 1, during the rotation of the base 1, each pit 15 on the base 1 will be accommodated and matched with the convex points 422 arranged in an annular manner one by one, and when the base 1 stops rotating, the accommodating cavity 42 Each convex point 422 in the accommodating cavity 42 is still correspondingly accommodated in a different concave pit 15 on the base 1, so that after the external force for rotating the base 1 is removed, the base 1 will not rotate easily, thereby realizing the angle adjustment of the base 1 and the support ring 2, and the base 1 and the support ring 2 can be adjusted to any angle in the accommodating cavity 42. In this way, the user can adjust the angle and direction of the supported mobile phone by adjusting the angle of the support ring 2 according to usage requirements, which is very convenient. When the base 1 is rotated to any angle, each convex point 422 in the accommodating cavity 42 is still correspondingly accommodated in a different concave pit 15 on the base 1, and after the external force for rotating the base 1 is removed, the base 1 will not rotate easily, thereby realizing the adjustment of the support ring 2 to any angle on the back plate of the mobile phone case.

[0047] refer to Figure 3 and Figure 5 In this embodiment, the number of protrusions 422 and pits 15 is thirty-six, and the thirty-six protrusions 422 are evenly arranged in a ring, and the thirty-six pits 15 are evenly arranged in a ring. In this way, when each pit 15 on the base 1 rotates from one protrusion 422 to another adjacent protrusion 422, the base 1 and the support ring 2 will rotate 10 degrees, and through the cooperation between the protrusions 422 and the pits 15, the base 1 has a sense of frustration during the rotation process, which can improve the user experience.

[0048] refer to Figure 1 , Figure 2 and Figure 5 A through hole 16 is formed on the base 1, and the wall of the annular protrusion 11 is outside the through hole 16. The size of the through hole 16 is equivalent to the size of the inner circle of the annular protrusion 11. Figure 5 A protrusion 423 is formed on the inner bottom of the accommodating cavity 42, and the protrusion 423 is accommodated in the through hole 16. In order to avoid interference between the protrusion 423 and the elastic finger ring 3, the top of the protrusion 423 is concave. In this way, in a natural state, the elastic finger ring 3 is located in the concave part of the top of the protrusion 423; refer to Figure 5, a plurality of indicating lines 424 arranged in a ring shape are formed on the raised portion 423, the number of indicating lines 424 is the same as the number of convex points 422, and different indicating lines 424 point to different convex points 422, respectively. In this embodiment, the number of indicating lines 424 is thirty-six and is evenly arranged in a ring shape, referring to Figure 4 and Figure 6 An indicating arrow 112 is formed on the annular protrusion 11. When the user rotates the base 1, the user can compare the indicating arrow 112 with the indicating line 424 on the protrusion 423. When the indicating arrow 112 rotates from one indicating line 424 to the next adjacent indicating line 424, it indicates that the base 1 and the support ring 2 have rotated 10 degrees, so that the user can intuitively know the specific angle value of the rotation of the base 1 and the support ring 2.

[0049] refer to Figure 6 When the support ring 2 is in an open state, the portion of the support ring 2 close to the hinge seat 13 on the base 1 rests against the inner wall of the accommodating cavity 42. In this way, the inner wall of the accommodating cavity 42 can limit the maximum angle of the support ring 2 to be flipped open, ensuring that the support ring 2 can firmly support the mobile phone after being fully flipped open.

[0050] refer to Figures 4 to 6 In the mobile phone case of the utility model, the mobile phone case body 4 is used to hold the mobile phone. When the user needs to watch a video or make a video call, the support ring 2 can be flipped open from the base 1 ( Figure 6 The support ring 2 can tilt and support the mobile phone case and the mobile phone after being flipped open, so that the user can watch videos or make video calls very conveniently. When the support ring 2 is not in use, the support ring 2 can be closed and stored by surrounding the wall of the support ring 2 on the periphery of the annular protrusion 11 ( Figure 4 When the elastic finger ring 3 is not in use, the elastic finger ring 3 can be accommodated in the space surrounding the annular protrusion 11, which does not affect the normal use of the mobile phone case. Since the elastic finger ring 3 is elastic and is made of non-hard material, there will be no pain even if the finger hooks the elastic finger ring 3 for a long time. The mobile phone case of the utility model can not only realize the function of supporting the mobile phone, but also allow the user to hook the elastic finger ring 3 for a long time without pain, which can bring a very good experience to the user. Moreover, when the angle of the support ring 2 needs to be adjusted, the base 1 is rotated, and the user can compare the indicator arrow 112 with the indicator line 424 on the protrusion 423. When the indicator arrow 112 rotates from one indicator line 424 to the next adjacent indicator line 424, it indicates that the support ring 2 is rotated 10 degrees on the back plate 41 of the mobile phone case body 4, so that the user can intuitively know the specific angle value of the rotation of the support ring 2.

[0051] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A finger ring bracket, characterized in that: include: A base for mounting on a mobile phone case, wherein the base is provided with an annular protrusion; A support ring, one side of which is hinged on the base, and the support ring can surround the periphery of the annular protrusion; and An elastic finger ring, one side of which is arranged on the inner wall of the annular protrusion, and the elastic finger ring can be accommodated in the space of the surrounding wall of the annular protrusion.

2. The finger ring stand according to claim 1, characterized in that: The inner wall of the support ring is provided with a convex buckle, and the outer wall of the annular protrusion is provided with a slot adapted to the convex buckle. When the supporting ring surrounding wall is at the periphery of the annular protrusion, the convex buckle can be snapped into the snap groove.

3. The finger ring stand according to claim 1, characterized in that: A concave cavity is arranged on the inner wall of the annular protrusion, a mounting portion is arranged on one side of the elastic finger ring, and a free end of the mounting portion is clamped in the concave cavity.

4. The finger ring stand according to claim 1, characterized in that: A clip is provided on the other side of the support ring.

5. The finger ring stand according to claim 1, characterized in that: The base is provided with a hinged portion, one side of the support ring is hinged on the hinged portion, and notches are provided at both ends of the hinged portion on the base. When the support ring is in an open state, a portion of the support ring close to the hinge portion can be accommodated in the notch portion.

6. A mobile phone case, characterized in that: The invention comprises a mobile phone case body and the finger ring bracket according to any one of claims 1 to 5, wherein the base is arranged on the back plate of the mobile phone case body.

7. The mobile phone case according to claim 6, characterized in that: The back plate is provided with a receiving cavity, the inner wall of the receiving cavity is provided with a circle of grooves, the inner bottom of the receiving cavity is provided with a plurality of protrusions arranged in a ring shape, the periphery of the base is accommodated in the groove, the base can rotate in the receiving cavity, the bottom of the base is provided with a plurality of pits arranged in a ring shape and adapted to the protrusions, and the protrusions are accommodated in the pits.

8. The mobile phone case according to claim 7, characterized in that: The number of the convex points and the concave pits is the same, and different convex points are respectively accommodated in different concave pits.

9. The mobile phone case according to claim 7, characterized in that: The base is provided with a through hole, and the annular raised wall is on the periphery of the through hole. A raised portion is provided on the inner bottom of the accommodating cavity, and the raised portion is accommodated in the through hole. The raised portion is provided with a plurality of indicator lines arranged in a ring shape, and the number of the indicator lines is the same as the number of the convex points. Different indicator lines point to different convex points respectively, and an indicator arrow is provided on the annular protrusion.

10. The mobile phone case according to claim 7, characterized in that: When the support ring is in an open state, a portion of the support ring close to the hinged position with the base can abut against the inner wall of the accommodating cavity.

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