A clamping mechanism and a bracket thereof

Abstract

The present invention discloses a clamping mechanism and a bracket thereof, which include a shell, a first clamp arm, a pushing assembly and a limiting assembly. The first clamp arm can be movably inserted into the shell from one end of the shell and installed, and can elastically shrink relative to the shell. The pushing assembly can be movably inserted into the shell and installed, and one end is exposed to the shell. The limiting assembly is installed in the shell and is locked with the first clamp arm to limit the first clamp arm from shrinking into the shell. The limiting assembly includes a pressure button, which is installed at the clamping position of the shell and protrudes relative to the clamping position. Among them, when the pushing assembly is pushed to shrink into the shell, the pushing assembly is locked with the first clamp arm and drives the first clamp arm to extend outward within the pushing stroke range, and the limiting assembly limits the first clamp arm; when the pressure button is pressed, the limiting assembly releases the locking position with the first clamp arm, and the first clamp arm shrinks. The clamping mechanism of the present invention can be easily operated with one hand, and it is convenient to clamp and remove electronic equipment.

Description

Technical Field

[0001] The invention relates to the technical field of electronic equipment brackets, and in particular to a clamping mechanism and a bracket thereof. Background Art

[0002] Mobile phones and other electronic devices can be clamped and fixed by the bracket, thereby freeing the user's hands and greatly facilitating the user's operation. For example, the car bracket can be fixed at the air outlet of the car to clamp the mobile phone, making it convenient for the driver to check the navigation.

[0003] The current bracket is difficult to operate with one hand, and it is inconvenient to clamp and remove the electronic device. Summary of the invention

[0004] The object of the present invention is to provide a clamping mechanism and a bracket thereof, which are easy to operate with one hand and inconvenient to clamp and remove electronic equipment.

[0005] The present invention discloses a clamping mechanism, including a shell, a first clamp arm, a pushing assembly and a limiting assembly. The first clamp arm can be movably inserted into the shell from one end of the shell and installed, and can elastically shrink relative to the shell. The pushing assembly can be movably inserted into the shell and installed, and one end is exposed to the shell. The limiting assembly is installed in the shell and is locked with the first clamp arm to limit the first clamp arm from shrinking into the shell. The limiting assembly includes a pressure button, which is installed at the clamping position of the shell and protrudes relative to the clamping position. Among them, when the pushing assembly is pushed to shrink into the shell, the pushing assembly is locked with the first clamp arm and drives the first clamp arm to extend outward within the pushing stroke range, and the limiting assembly limits the first clamp arm; when the pressure button is pressed, the limiting assembly releases the lock with the first clamp arm, and the first clamp arm shrinks.

[0006] Optionally, the extension assembly includes an extension rod and a locking member, the extension rod is rotatably connected to the locking member, and one end of the extension rod is exposed from the housing; a guide groove is provided at a position of the housing corresponding to the locking member, and the locking member is limited in the guide groove;

[0007] The extension rod is pushed to retract into the shell, and the locking member is locked with the first clamping arm under the guidance of the guide groove and drives the first clamping arm to extend outward.

[0008] Optionally, the first clamping arm includes two first sub-arms, the two first sub-arms are arranged opposite to each other, and a first sawtooth is arranged on one side of the first sub-arm facing the other first sub-arm; there are two clamping members, and two guide grooves are correspondingly arranged;

[0009] An opening is provided on the positioning piece, and a positioning pin is installed in the opening; the two positioning pieces are located between the two first sub-support arms; under the guidance of the guide groove, the positioning pins of the two positioning pieces are respectively positioned with the first saw teeth of the two first sub-support arms.

[0010] Optionally, the guide groove includes a first sub-groove and a second sub-groove which are connected to each other; the first sub-groove extends along the moving direction of the first clamp arm, and the second sub-groove is inclined toward the locking member; when the extension rod is pushed to retract into the shell, the limit stop of the locking member in the guide groove moves from the second sub-groove to the first sub-groove, so that the locking member rotates and locks with the first clamp arm.

[0011] Optionally, the locking member includes a connecting portion and a locking portion; the connecting portion is rotationally connected to the extension rod, the locking portion is connected to the connecting portion, and the connection between the locking portion and the connecting portion is bent so that the locking member is bent toward the locking portion of the first clamping arm.

[0012] Optionally, the extension assembly further includes a first elastic member, and the first elastic member is respectively connected to the housing and the extension rod.

[0013] Optionally, the limit assembly also includes a first limit member and a second elastic member, the second elastic member is respectively connected to the first limit member and the shell, and the first limit member abuts against the pressed button; under the elastic force of the second elastic member, the first limit member is locked with the first clamp arm to limit the first clamp arm from shrinking into the shell; when the pressed button is pressed, the pressed button drives the first limit member to release the lock with the first clamp arm.

[0014] Optionally, the first clamping arm includes two first sub-arms, the two first sub-arms are arranged opposite to each other, and a first sawtooth is arranged on one side of the first sub-arm facing the other first sub-arm; the first limiter is located between the two first sub-arms, and a second sawtooth is arranged on the first limiter;

[0015] Under the elastic force of the second elastic member, the first saw teeth are engaged with the second saw teeth to limit the first clamping arm from shrinking into the housing.

[0016] Optionally, a first inclined surface is provided on the first limiting member, and a second inclined surface is provided on the pressed button; the first inclined surface and the second inclined surface abut against each other; when the pressed button is pressed, the second inclined surface squeezes the first inclined surface to drive the first limiting member to release the blocking position with the first clamping arm.

[0017] The invention also discloses a bracket, comprising the clamping mechanism as described above.

[0018] The clamping mechanism of the present invention is provided with a push-pull assembly, and the limit assembly includes a pressure button. When the push-pull assembly is pushed to retract into the housing, the push-pull assembly is locked with the first clamp arm and drives the first clamp arm to extend outward. After the push-pull assembly is released, the limit assembly limits the first clamp arm so that the first clamp arm remains in an open position. When the user places an electronic device such as a mobile phone in the clamping position, the pressure button is pressed. After the pressure button is pressed, the limit assembly releases the locking position with the first clamp arm, and the first clamp arm automatically contracts under the action of elastic force, thereby clamping the electronic device. When the mobile phone needs to be removed, the first clamp arm can be opened by pressing the push-pull assembly again, thereby removing the electronic device. Therefore, the clamping mechanism of the present invention can be conveniently operated with one hand, and it is convenient to clamp and remove the electronic device. At the same time, the electronic device is not easy to interfere with the clamping mechanism during the process of taking and placing, and it is not easy to damage the air outlet blades of the car. The reset force generated by the clamping mechanism is fully applied to both sides of the electronic device, reducing the possibility of tilting and shaking, thereby reducing the possibility of falling after shaking. Furthermore, the arm span of the first clamping arm of the clamping mechanism is equal to the pushing stroke of the extension component, that is, the first clamping arm of the clamping mechanism will not be fully extended and has a small arm span, thereby reducing the influence of the clamping mechanism on the air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the implementation of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0020] Figure 1 is a schematic diagram of a clamping mechanism according to an embodiment of the present invention;

[0021] Figure 2 is an exploded view of a clamping mechanism according to an embodiment of the present invention;

[0022] Figure 3 is an internal schematic diagram of a clamping mechanism according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of a push-and-extend assembly according to an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of a first clamping arm according to an embodiment of the present invention;

[0025] Figure 6 is a schematic diagram of a rear housing according to an embodiment of the present invention;

[0026] Figure 7 is a perspective view of a clamping mechanism according to an embodiment of the present invention;

[0027] Figure 8 is another perspective view of the clamping mechanism according to an embodiment of the present invention;

[0028] Fig. 9 is another perspective view of the clamping mechanism according to an embodiment of the present invention;

[0029] Fig.10 is a cross-sectional view of a clamping mechanism according to an embodiment of the present invention;

[0030] Fig.11 yes Fig.10 A partial enlarged view of part A.

[0031] Among them, 1. shell; 11. front shell; 111. clamping position; 12. middle shell; 13. rear shell; 131. guide groove; 131a. first sub-groove; 131b. second sub-groove; 132. limit edge; 133. threaded column; 2. first clamp arm; 21. first sub-branch arm; 211. first serration; 3. second clamp arm; 4. extension assembly; 41. extension rod; 411. long strip opening; 412. mounting portion; 42. positioning member; 421. connecting portion; 422. positioning portion; 422a. opening; 422b. positioning pin; 422c. guide column; 423. first elastic member; 5. limit assembly; 51. pressed button; 511. second inclined surface; 52. first limit member; 521. second serration; 522. first inclined surface; 53. second elastic member; 6. third elastic member. DETAILED DESCRIPTION

[0032] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative, but the present invention can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0033] The present invention is described in detail below with reference to the accompanying drawings and optional embodiments.

[0034] like Figure 1 to Figure 2As shown, as an embodiment of the present invention, a clamping mechanism is disclosed, including a housing 1, a first clamp arm 2, a pushing assembly 4 and a limiting assembly 5. The first clamp arm 2 can be movably inserted into the housing 1 from one end of the housing 1 and installed, and can be elastically contracted relative to the housing 1. The pushing assembly 4 can be movably inserted into the housing 1 and installed, and one end is exposed to the housing 1. The limiting assembly 5 is installed in the housing 1 and is locked with the first clamp arm 2 to limit the first clamp arm 2 from contracting into the housing 1. The limiting assembly 5 includes a press button 51, which is installed at the clamping position 111 of the housing 1 and protrudes relative to the clamping position 111. Among them, when the pushing assembly 4 is pushed to contract into the housing 1, the pushing assembly 4 is locked with the first clamp arm 2 and drives the first clamp arm 2 to extend outward within the pushing stroke range, and the limiting assembly 5 limits the first clamp arm 2; when the press button 51 is pressed, the limiting assembly 5 releases the locking position with the first clamp arm 2, and the first clamp arm 2 contracts.

[0035] The clamping mechanism of the present invention is provided with a push-out assembly 4, and a limit assembly 5 includes a pressure button 51. During specific operation, the push-out assembly 4 is pushed to retract into the housing 1, and the push-out assembly 4 is locked with the first clamp arm 2 and drives the first clamp arm 2 to extend outward. After releasing the push-out assembly 4, the limit assembly 5 limits the first clamp arm 2, so that the first clamp arm 2 remains in the open position; when the user places an electronic device such as a mobile phone in the clamping position 111, the pressure button 51 is pressed. After the pressure button 51 is pressed, the limit assembly 5 is released from the first clamp arm 2, and the first clamp arm 2 automatically retracts under the action of elastic force, thereby clamping the electronic device. When the mobile phone needs to be removed, the push-out assembly 4 is pressed again to open the first clamp arm 2, thereby removing the electronic device. Therefore, the clamping mechanism of the present invention can be easily operated with one hand, and it is convenient to clamp and remove the electronic device; at the same time, the electronic device is not easy to interfere with the clamping mechanism during the process of taking and placing, and it is not easy to damage the air outlet blades of the car; the reset force generated by the clamping mechanism is completely applied to both sides of the electronic device, reducing the possibility of tilting and shaking, thereby reducing the possibility of falling after shaking. In addition, the arm span of the first clamping arm 2 of the clamping mechanism is the pushing stroke of the extension component, that is, the first clamping arm 2 of the clamping mechanism will not be fully extended, and the arm span is small, thereby reducing the impact of the clamping mechanism on the air outlet. When the arm span needs to be larger, the first clamping arm 2 can be directly stretched to make it have a larger arm span or a fully extended arm span.

[0036] Specifically, the clamping mechanism of the present invention realizes the opening of the first clamping arm 2 through the extension component 4, which is convenient for one-handed operation; and when the electronic device is placed in the clamping position 111, the pressed button 51 will be triggered at the same time to release the lock of the limit component 5, thereby realizing automatic clamping, which is convenient for one-handed operation. The push component 4 and the limit component 5 work together to realize the placement and pick-up of the electronic device. Driven by the push component 4, the first clamping arm 2 can also easily adjust the clamping width, which is convenient for clamping electronic devices of different sizes.

[0037] Specifically, Figure 1 As shown, the clamping mechanism also includes a second clamping arm 3, which is installed at the other end of the housing 1 and is arranged opposite to the first clamping arm 2 to clamp the electronic device together. The portion of the housing 1 between the first clamping arm 2 and the second clamping arm 3 is a clamping position 111, where electronic devices such as mobile phones are clamped. More specifically, the second clamping arm 3 can be integrally formed with the housing 1, or can be installed on one end of the housing 1 by screws, etc. Of course, it can also be installed on the housing 1 in other ways, which is not specifically limited in the present invention.

[0038] Alternatively, if Figure 3 As shown, the extension assembly 4 includes an extension rod 41 and a stopper 42, the extension rod 41 is rotatably connected to the stopper 42, and one end of the extension rod 41 is exposed to the housing 1; the housing 1 is provided with a guide groove 131 at a position corresponding to the stopper 42, and the stopper 42 is limited in the guide groove 131. When the extension rod 41 is pushed to retract into the housing 1, the stopper 42 is locked with the first clamping arm 2 under the guidance of the guide groove 131 and drives the first clamping arm 2 to extend outward. In this solution, the housing 1 is provided with a guide groove 131 at a position corresponding to the stopper 42, and the stopper 42 is rotatably connected to the extension rod 41, as shown in FIG. Figures 7 to 9 As shown, when the extension rod 41 is pushed, under the guidance of the guide groove 131, the locking member 42 is locked with the first clamping arm 2, thereby driving the first clamping arm 2 to extend outward and open.

[0039] Specifically, Figure 4 As shown, a guide column 422c is provided on one side of the retaining member 42 facing the guide groove 131, and the guide column 422c is inserted into the guide groove 131 to achieve guidance. More specifically, the housing 1 includes a front shell 11, a middle shell 12, and a rear shell 13. The extension rod 41 and the first clamping arm 2 are inserted into the rear shell 13, and the retaining member 42 is installed in the rear shell 13; the middle shell 12 is covered in the rear shell 13, and the front shell 11 is covered on the rear shell 13. The rear shell 13 and the middle shell 12 are both provided with guide grooves 131 at positions corresponding to the retaining member 42, and the bottom and top surfaces of the retaining member 42 are both provided with guide columns 422c, which are respectively inserted into the guide grooves 131 of the rear shell 13 and the middle shell 12, so as to achieve stable sliding.

[0040] Specifically, Figure 6 As shown, two limiting edges 132 are provided in the rear shell 13 , and the two limiting edges 132 are arranged opposite to each other. The extension rod 41 is installed between the two limiting edges 132 to limit the extension rod 41 and ensure the stable installation and movement of the extension rod 41 .

[0041] Alternatively, if Figure 3 and Figure 5As shown, the first clamp arm 2 includes two first sub-arms 21, the two first sub-arms 21 are arranged opposite to each other, and the first sub-arm 21 is provided with a first sawtooth 211 on one side facing the other first sub-arm 21; there are two positioning members 42, and two corresponding guide grooves 131 are provided. The positioning member 42 is provided with an opening 422a, and a positioning pin 422b is installed in the opening 422a; the two positioning members 42 are located between the two first sub-arms 21; under the guidance of the guide groove 131, the positioning pins 422b of the two positioning members 42 are respectively positioned with the first sawtooth 211 of the two first sub-arms 21. In this solution, the two positioning members 42 are respectively positioned with the first sawtooth 211 of the two first sub-arms 21 through the positioning pin 422b under the guidance of the two guide grooves 131, thereby pushing the first clamp arm 2 to extend outward, the thrust received by the first clamp arm 2 is average, and the extension movement is not easy to be stuck due to uneven force, thereby ensuring smooth and stable extension.

[0042] Alternatively, if Figure 6 As shown, the guide groove 131 includes a first sub-groove 131a and a second sub-groove 131b that are interconnected; the first sub-groove 131a extends along the moving direction of the first clamp arm 2, and the second sub-groove 131b is inclined toward the locking member 42; when the extension rod 41 is pushed to retract into the housing 1, the position of the locking member 42 in the guide groove 131 moves from the second sub-groove 131b to the first sub-groove 131a, so that the locking member 42 rotates and locks with the first clamp arm 2. In this solution, as shown in FIG. Figures 7 to 9 As shown, the first sub-groove 131a extends along the moving direction of the first clamping arm 2, and the second sub-groove 131b is inclined toward the locking member 42. In this way, when the limit of the locking member 42 moves from the second sub-groove 131b to the first sub-groove 131a, it can rotate and approach the first clamping arm 2 under the action of the guide groove 131, and finally lock with the first clamping arm 2. The structure is ingenious.

[0043] Alternatively, if Figure 4As shown, the locking member 42 includes a connecting portion 421 and a locking portion 422; the connecting portion 421 is rotatably connected to the extension rod 41, the locking portion 422 is connected to the connecting portion 421, and the connection between the locking portion 422 and the connecting portion 421 is bent, so that the locking member 42 is bent toward the locking position of the first clamping arm 2. In this solution, the connection between the locking portion 422 and the connecting portion 421 is bent, and the locking member 42 is bent toward the locking position of the first clamping arm 2, that is, the shape of the locking member 42 is bent and turned toward the locking position of the first clamping arm 2, so that the locking member 42 is easier to engage and has a small rotation stroke. Specifically, the opening 422a, the locking pin 422b and the guide column 422c are arranged on the locking portion 422. Specifically, after the guide post 422c enters the first sawtooth 211 and is locked with the first sawtooth 211, under the common limit of the first sawtooth 211 and the first sub-slot 131a, the guide post 422c will stay in the first sawtooth 211. When the first clamp arm 2 is unlocked, the guide post 422c will move with it under the common drive of the first sawtooth 211 and the first elastic member 423, so that the extension rod 41 and the guide post 422c are reset. The extension rod 41 is extended outward again, and the guide post 422c returns to the second sub-slot 131b. More specifically, the pushing stroke of the extension assembly 4 is formed by the movement of the extension rod 41 after the locking pin 422b is locked with the first sawtooth 211, that is, the stroke of the guide post 422c in the first sub-slot 131a after the locking pin 422b is locked with the first sawtooth 211.

[0044] Specifically, Figure 6 As shown, a threaded column 133 is provided on the rear shell 13, and the threaded column 133 is located between the two limit edges 132. A long strip opening 411 is provided on the extension rod 41, and the long strip opening 411 is extended along the moving direction of the extension rod 41, and the threaded column 133 is located in the long strip opening 411. The middle shell 12 is connected to the rear shell 13 through the threaded column 133, and the long strip opening 411 is provided on the extension rod 41 to avoid the threaded column 133, so as to ensure the normal movement of the extension rod 41.

[0045] Alternatively, if Figure 3As shown, the extension assembly 4 also includes a first elastic member 423, which is connected to the housing 1 and the extension rod 41, respectively, so that the extension rod 41 is extended and reset with the help of the elastic force of the first elastic member 423. In this solution, under the elastic force of the first elastic member 423, one end of the extension rod 41 moves outward from the housing 1 and returns to the initial position before the user presses, which is convenient for the next press. Specifically, when the extension rod 41 is pushed into the housing 1, the first elastic member 423 is in a stretched state and stores force. When the pressed button 51 is pressed, the first clamp arm 2 is retracted and reset, and at the same time, it works together with the first elastic member 423 to drive the extension rod 41 to extend and reset. Specifically, the first elastic member 423 can be a spring. The extension rod 41 and the middle shell 12 are both provided with a mounting portion 412, and the two ends of the first elastic member 423 are respectively connected to the mounting portions 412 of the extension rod 41 and the middle shell 12.

[0046] Alternatively, if Figure 3 As shown, the limiting assembly 5 further includes a first limiting member 52 and a second elastic member 53, the second elastic member 53 is connected to the first limiting member 52 and the housing 1 respectively, and the first limiting member 52 abuts against the pressed button 51; under the elastic force of the second elastic member 53, the first limiting member 52 is locked with the first clamp arm 2 to limit the first clamp arm 2 from shrinking toward the housing 1. When the pressed button 51 is pressed, the pressed button 51 drives the first limiting member 52 to release the locking position with the first clamp arm 2. In this solution, under the elastic force of the second elastic member 53, the second elastic member 53 pushes the first limiting member 52 to lock with the first clamp arm 2, thereby realizing the limiting of the first clamp arm 2 by the limiting assembly 5; when the pressed button 51 is pressed, the pressed button 51 drives the first limiting member 52 to release the locking position with the first clamp arm 2, thereby releasing the limiting of the first clamp arm 2 by the limiting assembly 5. After the first limiting member 52 is released from the limiting position with the first clamping arm 2 , the first clamping arm 2 shrinks toward the inside of the housing 1 under the action of elastic force, thereby clamping the electronic device.

[0047] Specifically, the second elastic member 53 may be a spring. The first position-limiting member 52 is provided with a mounting portion 412 , and two ends of the second elastic member 53 are connected to the mounting portion 412 and the rear housing 13 , respectively.

[0048] Alternatively, if Figure 3As shown, the first clamp arm 2 includes two first sub-arms 21, the two first sub-arms 21 are arranged opposite to each other, and the first sub-arm 21 is provided with a first sawtooth 211 on one side facing the other first sub-arm 21; the first limiter 52 is located between the two first sub-arms 21, and the first limiter 52 is provided with a second sawtooth 521. Under the elastic force of the second elastic member 53, the first sawtooth 211 is engaged with the second sawtooth 521 to limit the first clamp arm 2 from shrinking toward the housing 1. In this solution, the first limiter 52 is limited to the first clamp arm 2 by the engagement of the first sawtooth 211 with the second sawtooth 521, and the limit is stable. Specifically, the first sawtooth 211 is inclined toward the shrinking direction of the first clamp arm 2, so that the first limiter 52 can more easily clamp the first clamp arm 2 and limit the first clamp arm 2 from shrinking into the housing 1, and at the same time, the locking pin 422b of the locking member 42 can more easily enter between the first sawtooth 211 to drive the first clamp arm 2 to extend outward.

[0049] Alternatively, if Fig.10 and Fig.11 As shown, the first position-limiting member 52 is provided with a first inclined surface 522, and the pressed button 51 is provided with a second inclined surface 511; the first inclined surface 522 and the second inclined surface 511 are in contact with each other; when the pressed button 51 is pressed, the second inclined surface 511 squeezes the first inclined surface 522 to drive the first position-limiting member 52 to release the blocking position with the first clamping arm 2. In this solution, the pressed button 51 can push the first position-limiting member 52 to move through the cooperation of the first inclined surface 522 and the second inclined surface 511. Specifically, when the pressed button 51 is pressed and sinks inward, the second inclined surface 511 squeezes the first inclined surface 522 and drives the first position-limiting member 52 away from the first sub-branch arm 21, thereby contacting the blocking position with the first clamping arm 2; when the pressure on the pressed button 51 is removed, the second elastic member 53 pushes the first position-limiting member 52 to approach the first sub-branch arm 21 again for blocking. Specifically, the pressed button 51 of the present embodiment does not need to be provided with a spring for lifting the pressed button 51. Instead, with the help of the elastic force of the second elastic member 53, the first inclined surface 522 and the second inclined surface 511 cooperate to lift and reset the pressed button 51 while the first limit member 52 is reset. The structure is simple and the pressed button 51 is not prone to being difficult to press down due to excessive resistance.

[0050] Specifically, Figure 3 As shown, the clamping mechanism further includes a third elastic member 6, which is connected to the first clamping arm 2 and the housing 1, respectively, so that the first clamping arm 2 has an elastic force that can be elastically contracted relative to the housing 1. More specifically, two ends of the third elastic member 6 are connected to the first sub-arm 21 and the middle housing 12, respectively.

[0051] The invention also discloses a bracket, comprising the clamping mechanism as described above.

[0052] The above contents are further detailed descriptions of the present invention in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A clamping mechanism, characterized in that: include: case; A first clamping arm is movably inserted into the housing from one end of the housing and installed therein, and can be elastically contracted relative to the housing; A push-and-pull assembly, which can be movably inserted into the housing for installation, and one end of which is exposed outside the housing; A limit assembly is installed in the housing and is engaged with the first clamp arm to limit the first clamp arm from shrinking into the housing; the limit assembly includes a pressure button, which is installed at a clamping position of the housing and protrudes relative to the clamping position; The pushing and extending assembly is pushed to retract into the housing, the pushing and extending assembly is locked with the first clamp arm and drives the first clamp arm to extend outward within the pushing stroke range, and the limiting assembly limits the first clamp arm; the pressed button is pressed, the limiting assembly releases the locking position with the first clamp arm, and the first clamp arm retracts; The extension assembly includes an extension rod and a locking member, wherein the extension rod is rotatably connected to the locking member, and one end of the extension rod is exposed from the housing; a guide groove is provided at a position of the housing corresponding to the locking member, and the locking member is limited in the guide groove; the extension rod is pushed to retract into the housing, and the locking member is locked with the first clamp arm under the guidance of the guide groove and drives the first clamp arm to extend outward; The guide groove comprises a first sub-groove and a second sub-groove which are interconnected; the first sub-groove extends along the moving direction of the first clamp arm, and the second sub-groove is inclined toward the direction of the blocking member; when the extension rod is pushed to retract into the housing, the position limit of the blocking member in the guide groove moves from the second sub-groove to the first sub-groove, so that the blocking member rotates and blocks with the first clamp arm; The locking member includes a connecting portion and a locking portion; the connecting portion is rotationally connected to the extension rod, the locking portion is connected to the connecting portion, and the connection between the locking portion and the connecting portion is bent so that the locking member is bent toward the locking portion of the first clamp arm.

2. The clamping mechanism according to claim 1, characterized in that: The first clamping arm comprises two first sub-arms, the two first sub-arms are arranged opposite to each other, and a first sawtooth is arranged on one side of the first sub-arm facing the other first sub-arm; there are two clamping members, and two guide grooves are arranged correspondingly; The locking member is provided with an opening, in which a locking pin is installed; the two locking members are located between the two first sub-arms; under the guidance of the guide groove, the locking pins of the two locking members are respectively locked with the first serrations of the two first sub-arms.

3. The clamping mechanism according to claim 1, characterized in that: The extension assembly further includes a first elastic member, which is connected to the housing and the extension rod respectively.

4. The clamping mechanism according to any one of claims 1 to 3, characterized in that: The limiting assembly also includes a first limiting member and a second elastic member, the second elastic member being connected to the first limiting member and the shell respectively, and the first limiting member abutting against the pressed button; under the elastic force of the second elastic member, the first limiting member is locked with the first clamp arm to limit the first clamp arm from shrinking into the shell; when the pressed button is pressed, the pressed button drives the first limiting member to release the lock with the first clamp arm.

5. The clamping mechanism according to claim 4, characterized in that: The first clamping arm comprises two first sub-arms, the two first sub-arms are arranged opposite to each other, and a first sawtooth is arranged on one side of the first sub-arm facing the other first sub-arm; the first limiting member is located between the two first sub-arms, and a second sawtooth is arranged on the first limiting member; Under the elastic force of the second elastic member, the first saw teeth are meshed with the second saw teeth to limit the first clamp arm from shrinking into the housing.

6. The clamping mechanism according to claim 4, characterized in that: A first inclined surface is provided on the first limiting member, and a second inclined surface is provided on the pressed button; the first inclined surface and the second inclined surface are in contact with each other; when the pressed button is pressed, the second inclined surface squeezes the first inclined surface to drive the first limiting member to release the blocking position with the first clamping arm.

7. A bracket, characterized in that: Comprising the clamping mechanism as claimed in any one of claims 1 to 6.

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