Vehicle-mounted mobile phone support
By introducing rotatable suction cups and clamps into the car phone holder, the holder can be flexibly installed on the dashboard and air conditioning vents, solving the problem of unstable installation in existing technologies and improving the versatility and stability of the holder.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN YIPU HARDWARE IND CO LTD
- Filing Date
- 2025-07-10
- Publication Date
- 2026-07-10
AI Technical Summary
Existing car phone holders have a limited range of installation methods, which can easily lead to unstable installation due to broken air vent grilles or worn clips, affecting their reliability.
A car phone holder was designed, which uses a rotatable suction cup and a clamping component for installation on the dashboard and air conditioning vent, respectively. The support base and the holder body are connected by a hinge rod to achieve multi-angle adjustment and stable fixation.
It improves the versatility and stability of car phone holders, allowing users to freely choose the installation method according to the car model and usage scenario, thus meeting diverse usage needs.
Smart Images

Figure CN224476898U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mobile phone holder technology, specifically to a vehicle-mounted mobile phone holder. Background Technology
[0002] In today's society, cars have become an important means of transportation for people's daily travel. With the widespread use of smartphones, car phone holders have gradually become an indispensable accessory for drivers. Car phone holders can provide stable support for mobile phones while the vehicle is in motion, making it convenient for drivers to view maps and navigation, answer calls, etc., thus helping to improve driving safety and convenience.
[0003] For example, Chinese utility model patent CN220732819U discloses a car phone holder, including a support component, a sleeve, a phone holder body disposed on the upper side of the sleeve, a wireless charging pad disposed on the phone holder body, a connector disposed on the wireless charging pad, and an arc-shaped plate disposed on the sleeve via a support rod; a first adjustment component, including a rotating component disposed on the arc-shaped plate and a locking component disposed on the rotating component; and a second adjustment component, including an adjustment component disposed on the rotating component and a threaded component disposed on the adjustment component.
[0004] The aforementioned car phone holder simply attaches to the air vent using a clip, making the installation method rather simplistic. If the grille on the air vent breaks, or if the clip weakens due to prolonged use or the buckle wears down, the holder will become unstable or may even detach completely. Summary of the Invention
[0005] In view of the above-mentioned technical problems in the existing technology, this utility model provides a car-mounted mobile phone holder.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A car phone holder is provided, including a connecting arm, a support base, and a holder body. The two ends of the connecting arm are respectively provided with a first hinge rod and a second hinge rod. The other end of the first hinge rod, which is hinged to the connecting arm, is connected to the support base. The other end of the second hinge rod, which is hinged to the connecting arm, is rotatably connected to the holder body. The support base includes a pluggable base and a top cover. The bottom of the base is rotatably connected to a first mounting part for mounting on the dashboard. The top of the top cover is hinged to a second mounting part for mounting on an air conditioning vent.
[0008] Preferably, the first mounting part is a suction cup component, which includes a suction cup body and an extension rod located at its top. The extension rod is inserted into the base, and the suction cup body and the base are separated by a gap.
[0009] Preferably, the base also includes a mounting seat with a fixing groove. A connecting rod passes through the top of the extension rod, and both ends of the connecting rod are respectively located in the fixing groove. A first return spring is sleeved on the extension rod, and its two ends abut against the bottom of the mounting seat and the top of the suction cup body, respectively. The base can move downward along the extension rod axis under the action of external force, so that the connecting rod is disengaged from the fixing groove. At this time, the base can rotate circumferentially around the extension rod. A limit block is also provided on the mounting seat to limit the excessive rotation of the base.
[0010] Preferably, the second mounting part is a clamping member, and two clamping members are arranged alternately on the top of the top cover; the clamping member includes a fixed base and a linkage rod hinged to the fixed base, and the other end of the linkage rod hinged to the fixed base is provided with an air outlet clamp.
[0011] Preferably, the bracket body includes a front housing and a rear housing, and the other end of the second hinge rod that is hinged to the connecting arm is rotatably connected to the rear housing; a clamping component for clamping the mobile phone and a supporting component for supporting the mobile phone are also provided between the front housing and the rear housing.
[0012] Preferably, the clamping assembly includes two clamping arms that can move closer to or further away from each other, and a driving device for driving the two clamping arms to move closer to or further away from each other; one end of the clamping arm is provided with a first clamping claw, and the other end of the clamping arm is provided with a second clamping claw, and the first clamping claw of each clamping arm and the second clamping claw of the other clamping arm are staggered in the vertical direction.
[0013] Preferably, the driving device includes a movable plate, a driving button, and a tension spring; the movable plate is located between the front housing and the rear housing, and a stop is provided on the clamping arm. When the first clamping jaw is in the open state, both ends of the movable plate abut against the stop on the clamping arm; the driving button is located on the front housing and is connected to the movable plate in a transmission manner, and the driving button can drive the movable plate to move to disengage from the stop; both ends of the tension spring are hooked onto the two clamping arms respectively. When the movable plate disengages from the stop, the tension spring contracts and drives the two clamping arms to move towards each other to close the first clamping jaw; it also includes a second return spring, whose two ends abut against the back of the movable plate and the inner wall of the rear housing respectively, for driving the movable plate to move when the second clamping jaw is close, so that both ends of the movable plate abut against the stop again.
[0014] Preferably, the support assembly includes a base and a lever; the top of the base extends a mounting bracket located between the front housing and the rear housing; the lever is located in the rear housing and passes through the front housing and the rear housing, with a fixing plate extending from the end located between the front housing and the rear housing, engaging with the mounting bracket; when the lever is moved, the fixing plate can separate from the mounting bracket, and the base can slide to adjust its position under gravity; it also includes a third return spring, with its two ends abutting against the fixing plate and the inner wall of the front housing respectively, for driving the fixing plate to return to its original position and re-engage with the mounting bracket after the lever is released.
[0015] Preferably, the other end of the second hinge rod that is hinged to the connecting arm is provided with a universal ball, and the back of the rear housing is provided with a ball head seat for placing the universal ball, and a fixing sleeve is threaded onto the ball head seat.
[0016] The beneficial effects of this utility model are:
[0017] This utility model discloses a car phone holder, which is provided with a first mounting part and a second mounting part. The first mounting part is rotatably connected to the dashboard, and the second mounting part is hinged to the top cover for installation on the air conditioning vent. The driver can freely choose to install the holder on the dashboard or the air conditioning vent according to the layout of the car and personal usage habits, so as to meet the needs of different car models and scenarios and greatly improve the versatility of the product. Attached Figure Description
[0018] Figure 1 This is a perspective view of the second mounting part of a vehicle-mounted mobile phone holder in one embodiment.
[0019] Figure 2 This is a perspective view of the retracted second mounting part of a vehicle-mounted mobile phone holder in an embodiment.
[0020] Figure 3 This is a perspective view of the support base in the embodiment.
[0021] Figure 4 This is a cross-sectional view of the base in the embodiment.
[0022] Figure 5 This is an exploded view of the support body in the embodiment.
[0023] Figure 6 This is an exploded view of the support body in the embodiment from another perspective.
[0024] Figure 7 This is another exploded view of the support body in the embodiment.
[0025] Reference numerals: 1. Connecting arm; 10. First hinge rod; 11. Second hinge rod; 110. Universal ball; 2. Support base; 20. Base; 21. Suction cup component; 211. Suction cup body; 212. Extension rod; 22. Connecting rod; 23. First return spring; 24. Mounting base; 241. Limiting block; 25. Top cover; 26. Clamping component; 261. Fixed base; 262. Linkage rod; 263. Air outlet clamp; 3. Support Frame body; 30, front housing; 31, rear housing; 311, ball joint; 312, fixing sleeve; 32, clamping arm; 321, first clamping jaw; 322, second clamping jaw; 323, stop block; 34, drive device; 341, movable plate; 342, drive button; 343, tension spring; 344, second return spring; 35, base; 351, mounting bracket; 36, lever; 361, fixing plate; 37, third return spring. Detailed Implementation
[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0027] This embodiment provides a car-mounted phone holder, such as... Figures 1 to 7 As shown, the device includes a connecting arm 1, a support base 2, and a bracket body 3. One end of the connecting arm 1 is hinged to a first hinge rod 10, and the other end of the first hinge rod 10, hinged to the connecting arm 1, is fixedly connected to the support base 2. The other end of the connecting arm 1 is hinged to a second hinge rod 11, and the other end of the second hinge rod 11, hinged to the connecting arm 1, is rotatably connected to the bracket body 3. This design allows users to flexibly adjust the angle and position of the bracket body 3, thereby enabling multi-angle adjustment of the mobile phone on the bracket body to meet diverse usage needs such as navigation and video viewing.
[0028] Furthermore, the support base 2 includes a pluggable base 20 and a top cover 25. The bottom of the base 20 is provided with a first mounting part for mounting on the dashboard, and the top of the top cover 25 is provided with a second mounting part for mounting on the air conditioning vent. This design allows users to freely switch the installation method according to the actual situation. For example, if the first mounting part of the base 20 is damaged, it can be installed on the air conditioning vent through the second mounting part of the top cover 25. Or, if the air conditioning vent grille is broken, it can be installed on the dashboard through the first mounting part of the base 20, which improves practicality.
[0029] The first mounting part is a suction cup component 21, which includes a suction cup body 211 and an extension rod 212 located at its top. The extension rod 212 is inserted into the base 20, and a gap is provided between the suction cup body 211 and the base 20. The base 20 can also rotate along the extension rod 212. Specifically, the base 20 is provided with a mounting seat 24, the top of the extension rod 212 is inserted into the mounting seat 24, the mounting seat 24 is provided with a fixing groove, and the top of the extension rod 212 is provided with a connecting rod 22. The two ends of the connecting rod 22 are respectively located in the fixing groove. At this time, the snap-fit between the connecting rod 22 and the fixing groove can restrict the circumferential rotation of the base 20 relative to the extension rod 212, so that the base 20 is in a fixed state. When it is necessary to adjust the angle of the base 20, an external force is first applied to make the base 20 move downward along the axial direction of the extension rod 212. At this time, the connecting rod 22 is squeezed by the base 20 and gradually disengages from the fixing groove. The base 20 loses its limiting constraint and can then rotate freely around the axis of the extension rod 212 to achieve angle adjustment. Since the top cover 25 is inserted into the base 20, when the base 20 rotates, it can drive the top cover 25, the connecting arm 1, and the bracket body 3 to rotate forward.
[0030] In addition, the mounting base 24 is provided with an inclined guide surface. When the connecting rod 22 drives the base 20 to rotate after disengaging from the fixing groove, the connecting rod 22 will also slide from high to low. As it rotates, the connecting rod 22 will gradually move to the lower area of the guide surface. This inclined guide surface can provide reverse support when there is swaying in scenarios such as vehicle movement, thus preventing the base 20 from rotating unexpectedly to a certain extent. Furthermore, the mounting base 24 is provided with a limiting block 241 to limit the rotation angle range of the base 20 and prevent excessive rotation. Specifically, the limiting block 241 is located in the lower area of the guide surface. When the base 20 is driven to rotate by an external force, and the connecting rod 22 slides along the guide surface from high to low, when it rotates to the maximum angle, the connecting rod 22 will abut against the limiting block 241, at which point the base 20 can no longer rotate.
[0031] The extension rod 212 is also equipped with a first return spring 23, the two ends of which abut against the bottom of the mounting base 24 and the top of the suction cup body 211, respectively. By setting the first return spring 23, when the connecting rod 22 is engaged in the fixing groove, the first return spring 23 can give the base 20 an upward elastic force, so that the fixing groove and the connecting rod 22 are tightly engaged, preventing the base 20 from moving downward under the action of gravity, and causing the fixing groove to disengage from the connecting rod 22.
[0032] Furthermore, the second mounting part on the top cover 25 is a clamping member 26. Two clamping members 26 are staggered on the top of the top cover 25. The clamping member 26 includes a fixing base 261, a linkage rod 262, and an air outlet clamp 263. The fixing base 261 is fixedly installed on the top of the top cover 25, while the linkage rod 262 is hinged to the fixing base 261. The air outlet clamp 263 is hinged to the other end of the fixing base 261 and connected to the linkage rod 262. In use, when the user chooses to clamp the mobile phone holder at the air conditioner vent using the clamping member 26, they only need to open the linkage rod 262 and then clamp the air outlet grille of the air conditioner vent using the air outlet clamp 263. When it is necessary to switch the installation method, the linkage rod 262 can be retracted and folded in the opposite direction. Because the two clamping members 26 are staggered in advance, the linkage rod 262 and the air outlet clamp 263 can avoid interference during the retraction process due to spatial misalignment.
[0033] Furthermore, the bracket body 3 includes a front housing 30 and a rear housing 31. The other end of the second hinge rod 11, which is hinged to the connecting arm 1, is rotatably connected to the rear housing 31. Specifically, a ball joint 311 is provided on the back of the rear housing 31, and a universal ball 110 is provided at the other end of the second hinge rod 11, which is hinged to the connecting arm 1. The universal ball 110 is inserted into the ball joint 311. A fixing sleeve 312 is also provided on the ball joint 311, and the fixing sleeve 312 is threadedly connected to the ball joint 311. In use, when it is necessary to adjust the bracket angle, the fixing sleeve 312 is rotated to loosen its thread from the ball joint 311, and the universal ball 110 can then rotate freely within the ball joint 311. After the angle adjustment is completed, the fixing sleeve 312 is tightened again. The axial compression of the universal ball 110 by the fixing sleeve 312 locks it within the ball joint 311, ensuring that the bracket angle is stable and does not wobble during use.
[0034] The front housing 30 and the rear housing 31 are further provided with a clamping assembly for holding the mobile phone and a supporting assembly for supporting the mobile phone. The clamping assembly includes two clamping arms 32 that can move closer or further apart, and a driving device 34 for driving the two clamping arms 32 to move closer or further apart. The two clamping arms 32 are staggered, with a first clamping claw 321 at one end of each clamping arm 32 and a second clamping claw 322 at the other end. The first clamping claw 321 is located above the second clamping claw 322. Because the two clamping arms 32 are staggered, the first clamping claw 321 of each clamping arm 32 and the second clamping claw 322 of the other clamping arm 32 are staggered in the vertical direction. Therefore, when the two first clamping claws 321 are close together, the two second clamping claws 322 are open, and vice versa. When the two first grippers 321 are close to each other, they can form a gripping part for holding the mobile phone, and when the two second grippers 322 are close to each other, they can form a guiding part, which can provide a certain guidance when the mobile phone is placed from top to bottom.
[0035] The drive device 34 includes a movable plate 341, a drive button 342, and a tension spring 343. The movable plate 341 is located between the front housing 30 and the rear housing 31. When the first gripper 321 is in the open state, both ends of the movable plate 341 abut against the two gripping arms 32. The two gripping arms 32 are provided with stops 323 that can abut against the ends of the movable plate 341. When the ends of the movable plate 341 abut against the stops 323 on the gripping arms 32, the movable plate 341 can restrict the opposite movement of the two gripping arms 32, maintaining the open posture of the first gripper 321. The drive button 342 is located on the outside of the front housing 30 and is connected to the movable plate 341. By pressing the drive button 342, the user can move the movable plate 341 in a specific direction within the front housing 30 and the rear housing 31, causing the ends of the movable plate 341 to disengage from the abutment state with the stops 323 on the gripping arms 32.
[0036] The two ends of the tension spring 343 are hooked onto the two clamping arms 32 respectively. When the movable plate 341 is freed from the constraint of the stop block 323, the tension spring 343 generates tension due to its own elastic contraction, which drives the two clamping arms 32 to move towards each other, thereby enabling the first clamping claw 321 to close and complete the clamping operation of the mobile phone.
[0037] The drive device 34 also includes a second return spring 344, whose two ends abut against the back of the movable plate 341 and the inner wall of the rear housing 31, respectively. When it is necessary to remove the mobile phone from the bracket body 3, the two first grippers 321 are first driven to move away from each other to release the gripping state of the mobile phone. At this time, under the action of the elastic force, the second return spring 344 drives the movable plate 341 to move in the opposite direction, so that the two ends of the movable plate 341 abut against the stop 323 on the clamping arm 32 again, so that the two first grippers 321 are in a moving away state and the two grippers are in a moving closer state, so as to remove the mobile phone.
[0038] Furthermore, the support assembly includes a base tray 35 for supporting the mobile phone. When the mobile phone is placed on the bracket body 3 and the two first grippers 321 are not close to each other to hold the mobile phone, the base tray 35 can support the mobile phone. A mounting bracket 351 extends from the top of the base tray 35 and is located between the front housing 30 and the rear housing 31. The support assembly also includes a lever 36, which is located on the rear housing 31. One end of the lever 36 passes between the front housing 30 and the rear housing 31. A fixing plate 361 is provided between the lever 36 and the rear housing 31. In the initial state, the fixing plate 361 and the mounting bracket 351 of the base tray 35 engage with each other, so that the base tray 35 firmly supports the mobile phone and maintains a fixed height.
[0039] When it is necessary to adjust the position of the adjustable base 35, first move the lever 36. The lever 36 moves the fixing plate 361, so that the fixing plate 361 is disengaged from the mounting bracket 351. At this time, the base 35 can be moved down by gravity or moved up by holding the bottom of the base 35 by hand, thereby changing the height of the base 35. The support assembly also includes a third return spring 37, which is located between the front housing 30 and the rear housing 31. Its two ends abut against the fixing plate 361 and the inner wall of the front housing 30, respectively. When the lever 36 is moved to disengage the fixing plate 361 from the mounting bracket 351, the third return spring 37 is in a compressed state. When the base 35 is adjusted to a suitable position, the lever 36 is released, and the third return spring 37 can drive the fixing plate 361 to move in the opposite direction under the action of the elastic force, so that the fixing plate 361 re-engages with the mounting bracket 351, and the lever 36 quickly completes the reset. At the same time, under the action of the elastic force of the third return spring 37, the fixing plate 361 and the mounting bracket 351 can be more firmly engaged, avoiding the fixing plate 361 from being accidentally loosened due to vibration or bumps during vehicle operation.
[0040] In the description of this utility model, it is obvious that the described embodiments are only a part of the embodiments of this utility model, and not all of them. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0041] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0042] In the description of this utility model, it should be noted that the terms "middle," "upper," "lower," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
Claims
1. A vehicle-mounted mobile phone holder, comprising a connecting arm (1), a support base (2), and a holder body (3), wherein the two ends of the connecting arm (1) are respectively provided with a first hinge rod (10) and a second hinge rod (11), the other end of the first hinge rod (10) hinged to the connecting arm (1) is connected to the support base (2), and the other end of the second hinge rod (11) hinged to the connecting arm (1) is rotatably connected to the holder body (3), characterized in that, The support base (2) includes a pluggable base (20) and a top cover (25). The bottom of the base (20) is rotatably connected to a first mounting part for mounting on a dashboard, and the top of the top cover (25) is hinged to a second mounting part for mounting on an air conditioning vent.
2. The vehicle-mounted mobile phone holder according to claim 1, characterized in that, The first mounting part is a suction cup component (21), which includes a suction cup body (211) and an extension rod (212) located on its top. The extension rod (212) is inserted into the base (20), and the suction cup body (211) and the base (20) are separated by a gap.
3. A car-mounted mobile phone holder according to claim 2, characterized in that, The base (20) is also provided with a mounting seat (24), which has a fixing groove. The top of the extension rod (212) is provided with a connecting rod (22), and the two ends of the connecting rod (22) are respectively located in the fixing groove. The extension rod (212) is fitted with a first return spring (23), and its two ends are respectively in contact with the bottom of the mounting seat (24) and the top of the suction cup body (211). The base (20) can move downward along the extension rod (212) under the action of external force so that the connecting rod (22) is disengaged from the fixing groove. At this time, the base (20) can rotate around the extension rod (212) in a circumferential direction. The mounting seat (24) is also provided with a limiting block (241) to limit the excessive rotation of the base (20).
4. A car-mounted mobile phone holder according to claim 1, characterized in that, The second mounting part is a clamping member (26), and two clamping members (26) are arranged alternately on the top of the top cover (25). The clamping member (26) includes a fixed base (261) and a linkage rod (262) hinged to the fixed base (261). The other end of the linkage rod (262) hinged to the fixed base (261) is provided with an air outlet clamp (263).
5. A car-mounted mobile phone holder according to claim 1, characterized in that, The bracket body (3) includes a front housing (30) and a rear housing (31). The other end of the second hinge rod (11) hinged to the connecting arm (1) is rotatably connected to the rear housing (31). A clamping component for holding the mobile phone and a supporting component for supporting the mobile phone are also provided between the front housing (30) and the rear housing (31).
6. A car-mounted mobile phone holder according to claim 5, characterized in that, The clamping assembly includes two clamping arms (32) that can move closer or further apart from each other, and a driving device (34) for driving the two clamping arms (32) to move closer or further apart from each other; one end of the clamping arm (32) is provided with a first clamping jaw (321), and the other end of the clamping arm (32) is provided with a second clamping jaw (322). The first clamping jaw (321) of each clamping arm (32) and the second clamping jaw (322) of the other clamping arm (32) are staggered in the vertical direction.
7. A car-mounted mobile phone holder according to claim 6, characterized in that, The drive device (34) includes a movable plate (341), a drive button (342), and a tension spring (343). The movable plate (341) is located between the front housing (30) and the rear housing (31). A stop (323) is provided on the clamping arm (32). When the first clamping jaw (321) is in the open state, both ends of the movable plate (341) abut against the stop (323) on the clamping arm (32). The drive button (342) is located on the front housing (30) and is connected to the movable plate (341) in a transmission manner. The drive button (342) can drive the movable plate (341) to move to disengage. The stop block (323) is disengaged; the two ends of the tension spring (343) are hooked onto the two clamping arms (32) respectively. When the movable plate (341) disengages from the stop block (323), the tension spring (343) contracts and drives the two clamping arms (32) to move towards each other so that the first clamping jaw (321) closes; it also includes a second return spring (344), the two ends of which abut against the back of the movable plate (341) and the inner wall of the rear housing (31) respectively. It is used to drive the movable plate (341) to move when the second clamping jaw (322) is close, so that the two ends of the movable plate (341) abut against the stop block (323) again.
8. A car-mounted mobile phone holder according to claim 5, characterized in that, The support assembly includes a base (35) and a lever (36); the top of the base (35) extends a mounting bracket (351) located between the front housing (30) and the rear housing (31); the lever (36) is located in the rear housing (31) and passes between the front housing (30) and the rear housing (31), and one end of the lever (36) located between the front housing (30) and the rear housing (31) extends a fixing plate (361) that engages with the mounting bracket (351); when the lever (36) is moved, the fixing plate (361) can be separated from the mounting bracket (351), and the base (35) can slide and adjust its position under the action of gravity; it also includes a third return spring (37), the two ends of which abut against the fixing plate (361) and the inner wall of the front housing (30) respectively, for driving the fixing plate (361) to return to its original position and re-engage with the mounting bracket (351) after the lever (36) is released.
9. A car-mounted mobile phone holder according to claim 5, characterized in that, The other end of the second hinge rod (11) that is hinged to the connecting arm (1) is provided with a universal ball (110). The back of the rear housing (31) is provided with a ball head seat (311) for placing the universal ball (110), and a fixing sleeve (312) is threaded onto the ball head seat (311).