Adjusting mechanism for opening and closing angle of bracket

Abstract

The utility model relates to a support opening and closing angle adjusting mechanism which comprises a base and a plurality of supporting legs connected to the base in a rotating mode, the base comprises a base body and a lantern ring, the base body is provided with a plurality of installation grooves which are arranged at intervals in the circumferential direction, the lantern ring is arranged on the side circumference of the base body in a rotating and sleeved mode, and the lantern ring is provided with a plurality of notches which are arranged at intervals in the circumferential direction and equal to the installation grooves in number. One end of each supporting leg is rotationally connected to the inner side wall of the corresponding mounting groove, the supporting legs can swing relative to the base body so as to be switched between a first state and a second state, in the first state, the outer side walls of the supporting legs abut against the lantern rings so as to limit the maximum opening and closing angle of the supporting legs in the first state, and the lantern rings rotate relative to the base body till the mounting grooves are aligned with the notches one by one; the notches provide swing space for the supporting legs to continue to turn outwards so that the supporting legs can penetrate through the notches to be switched to the second state, and at the moment, the outer side walls of the supporting legs abut against the inner side walls of the notches so as to limit the maximum opening and closing angle of the supporting legs in the second state when the supporting legs turn outwards.

Description

Technical Field

[0001] This utility model relates to the field of photographic equipment technology, and in particular to an adjustment mechanism for the opening and closing angle of a bracket. Background Technology

[0002] In everyday photography, tripods are indispensable. Their role is crucial for both professional and amateur users, primarily stabilizing the camera. Most tripods nowadays include an angle adjustment mechanism to adjust the opening and closing of the legs. However, most push-button tripods on the market have complex structures, are inconvenient to install, and are relatively expensive. Utility Model Content

[0003] The present invention provides an adjustment mechanism for the opening and closing angle of a tripod, in order to solve the technical problems that most press-type tripod angle adjustment mechanisms are complex in structure, inconvenient to install, and have high cost.

[0004] This utility model discloses an adjustment mechanism for the opening and closing angle of a support, comprising:

[0005] The base includes a seat body and a collar. The seat body has multiple circumferentially spaced mounting grooves. The collar is rotatably fitted around the side of the seat body. The collar has multiple circumferentially spaced notches. The number of mounting grooves is equal to the number of notches.

[0006] Multiple support legs are rotatably connected to the inner wall of the mounting groove. The support legs can swing relative to the base body to switch between a first state and a second state. The opening and closing angle of the support legs in the first state is smaller than the opening and closing angle of the support legs in the second state.

[0007] In the first state, the mounting groove and the notch are misaligned, and the outer side of the support leg abuts against the collar to limit the maximum opening angle of the support leg in the first state; the collar rotates relative to the seat body until the mounting groove and the notch are aligned, and the notch provides swing space for the support leg to continue to turn outward so that the support leg passes through the notch to switch to the second state, and the outer side of the support leg abuts against the inner sidewall of the notch to limit the maximum opening angle of the support leg in the second state.

[0008] In one embodiment, one of the outer wall of the base and the inner wall of the collar is provided with an arc-shaped groove, and the other is provided with a slider. The arc-shaped groove extends circumferentially along the base. The slider is aligned and engaged in the arc-shaped groove. During the rotation of the collar relative to the base, the slider moves between the beginning and end of the arc-shaped groove. When the slider is located at the beginning of the arc-shaped groove, the mounting groove is misaligned with the notch. When the slider is located at the end of the arc-shaped groove, the mounting groove is aligned and connected with the notch.

[0009] In one embodiment, the first and second ends of the arc-shaped groove are respectively provided with a first slot and a second slot. In the first state, the mounting groove and the notch are completely misaligned, and the slider is engaged in the first slot. In the second state, the mounting groove and the notch are aligned, and the slider is engaged in the second slot.

[0010] In one embodiment, the bottom wall of the arc-shaped groove is provided with at least one boss, and the boss is located between the first slot and the second slot;

[0011] The arc-shaped groove is provided on the outer wall of the seat body, and there is a gap between the upper surface of the boss and the inner wall of the collar along the depth direction of the arc-shaped groove; or, the arc-shaped groove is provided on the inner wall of the collar, and there is a gap between the upper surface of the boss and the outer wall of the seat body along the depth direction of the arc-shaped groove.

[0012] In one embodiment, at least one of the outer wall of the first slot and the outer wall of the slider is provided with a first guide surface. The first guide surface extends along the depth direction inclined to the arcuate groove. When the collar rotates relative to the seat, the outer wall of the first slot and the slider move relative to each other along the first guide surface until the slider moves to engage in the first slot; and / or,

[0013] At least one of the outer wall of the second slot and the outer wall of the slider is provided with a second guide surface. The second guide surface extends along the depth direction of the arc-shaped groove. When the collar rotates relative to the seat, the outer wall of the second slot and the outer wall of the slider move relative to each other along the second guide surface until the slider moves to be engaged in the second slot.

[0014] In one embodiment, at least one of the inner wall of the first slot and the outer wall of the slider is provided with a third guide surface, the third guide surface extending along the depth direction inclined to the arcuate groove. When the collar rotates relative to the seat, the inner wall of the first slot and the outer wall of the slider move relative to each other along the third guide surface until the slider moves to disengage from the first slot; and / or,

[0015] At least one of the inner sidewall of the second slot and the outer sidewall of the slider is provided with a fourth guide surface. The fourth guide surface extends along the depth direction of the arc-shaped groove. When the collar rotates relative to the seat, the inner sidewall of the second slot and the outer sidewall of the slider move relative to each other along the fourth guide surface until the slider moves to disengage from the second slot.

[0016] In one embodiment, the base extends outward at opposite ends of its thickness, protruding opposite first and second annular bosses, respectively, and the collar is clamped between the first and second annular bosses; wherein, along the circumference of the base, the first annular boss is in a continuous circular state, and the second annular boss is truncated by the mounting groove.

[0017] In one embodiment, the leg has a mounting arm and a support arm connected axially thereto. The mounting arm is rotatably connected to the inner wall of the mounting groove via a pivot. The radial dimension of the mounting arm is smaller than the width of the mounting groove, and the radial dimension of the support arm is larger than the width of the mounting groove.

[0018] In one embodiment, the multiple legs can swing to a side-by-side close-up position. When the mounting groove and the notch are misaligned, there is a gap between the outer wall of the mounting arm and the inner wall of the collar. The mounting arm can rotate outward to abut against the collar, and the multiple legs switch to the bracket unfolded state.

[0019] In one embodiment, the depth of the notch along the thickness direction of the base is not less than the depth of the mounting groove. When the mounting groove is aligned with the notch, the leg can continue to be turned outward until the inner walls of multiple legs are in the same plane, so that the inner walls of the legs can be attached to the support plane.

[0020] As can be seen from the above technical solution, the embodiments of this utility model have at least the following advantages and positive effects:

[0021] This utility model provides an adjustment mechanism for the opening and closing angle of a support bracket, including a base and multiple legs rotatably connected to the base. The base includes a seat body and a collar. The seat body has multiple circumferentially spaced mounting grooves. The collar is rotatably fitted onto the side circumference of the seat body and has multiple circumferentially spaced notches equal in number to the mounting grooves. Users only need to rotate the collar and seat body relative to each other in the base, switching the mounting grooves and notches between misalignment and alignment, thereby changing the different circumferential positions of the outer walls of the legs against the collar, thus adjusting the opening and closing angles of the legs. The adjustment mechanism of this application has a simple structure, is easy to assemble, and is convenient to operate during adjustment. It is highly practical and can well meet the user's shooting needs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the support adjustment mechanism in an embodiment of this application, showing the main body of the support frame in a closed state.

[0024] Figure 2 for Figure 1 A schematic diagram of the adjustment mechanism in which the main body of the tripod is in the unfolded state.

[0025] Figure 3 for Figure 1 A schematic diagram of the adjustment mechanism in which the main body of the tripod is in a flat position;

[0026] Figure 4 for Figure 2 An enlarged schematic diagram of point A in the adjustment mechanism shown;

[0027] Figure 5 for Figure 3 An enlarged schematic diagram of point B in the adjustment mechanism shown;

[0028] Figure 6 For along Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0029] Figure 7 for Figure 3 A partial exploded structural diagram of the adjustment mechanism shown;

[0030] Figure 8 For along Figure 1 A schematic diagram of the cross-sectional structure along the BB direction.

[0031] The annotations in the attached figures are explained as follows:

[0032] 10. Adjustment mechanism for opening and closing the bracket; 11. Base; 100. Seat body; 110. Mounting groove; 120. Arc groove; 130. First slot; 131. First guide surface; 132. Third guide surface; 140. Second slot; 141. Second guide surface; 142. Fourth guide surface; 150. Boss; 160. First annular boss; 170. Second annular boss; 200. Collar; 210. Notch; 220. Slider; 12. Leg body; 300. Support leg; 310. Mounting arm; 320. Support arm; 330. Rotating shaft. Detailed Implementation

[0033] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "setup," and "connection" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Reference Figure 1-3This application provides a novel bracket opening and closing angle adjustment mechanism 10, including a base 11 and a leg body 12 connected to one side of the base 11. The base 11 includes a seat 100 and a collar 200. The seat 100 has multiple circumferentially spaced mounting grooves 110. The collar 200 is rotatably fitted around the side of the seat 100 and has multiple spaced notches 210. The number of mounting grooves 110 and notches 210 is equal. The base 11 and the collar 200 rotate relative to each other, so that the mounting grooves 110 and notches 210 can switch between one-to-one alignment and misalignment. The leg body 12 includes multiple legs 300, each leg 300 is rotatably connected to the inner side wall of the mounting groove 110. The legs 300 can swing up and down relative to the seat 100, in a first state ( Figure 1 and Figure 2 ) and the second state ( Figure 3 The support leg 300 can switch between two states, with the opening angle of the support leg 300 in the first state being smaller than that in the second state. Here, the number of support legs 300, mounting slots 110, and notches 210 are all equal, optionally. The support leg 300 has three legs, forming a tripod. Tripods offer greater stability. It should be noted that in other embodiments, the number of support legs 300 can be three or more.

[0037] Reference Figure 4 and Figure 5 In the first state, such as Figure 4 As shown, the mounting slot 110 and the notch 210 are misaligned, and the outer wall of the support leg 300 abuts against the collar 200 to limit the maximum opening angle of the support leg 300 in the first state. The collar 200 rotates relative to the seat 100 until the mounting slot 110 and the notch 210 are aligned. The notch 210 provides swing space for the support leg 300 to continue to swing outward, so that the support leg 300 passes through the notch 210 to switch to the second state. Figure 5 As shown), the outer wall of the outrigger 300 abuts against the inner wall of the notch 210 to limit the maximum engagement angle of the outrigger 300 in the second state.

[0038] The bracket opening and closing angle adjustment mechanism 10 provided by this utility model allows the user to adjust the opening and closing angle of the support leg 300 by simply rotating the base 100 and the collar 200 in the base 11 relative to each other. This allows the mounting groove 110 and the notch 210 to switch between misalignment and alignment, thereby changing the circumferential position of the outer wall of the support leg 300 against the collar 200 and thus adjusting the opening and closing angle of the support leg 300. The adjustment mechanism 10 of this application has a simple structure, is easy to assemble, and is convenient to operate during adjustment. It only requires rotating either the base 100 or the collar 200, making it highly practical and able to well meet the user's shooting needs.

[0039] Preferably, in conjunction with reference Figure 6 and Figure 7 In one embodiment, one of the outer sidewall of the seat 100 and the inner sidewall of the collar 200 is provided with an arc-shaped groove 120, and the other is provided with a slider 220. The arc-shaped groove 120 extends circumferentially along the seat 100, and the slider 220 is aligned and engaged within the arc-shaped groove 120. During the rotation of the collar 200 relative to the seat 100, the slider 220 moves between the first end and the last end of the arc-shaped groove 120. When the slider 220 is located at the first end of the arc-shaped groove 120, the mounting groove 110 and the notch 210 are completely misaligned, and the support leg 300 is in a first state. When the slider 220 is located at the last end of the arc-shaped groove 120, the mounting groove 110 and the notch 210 are aligned and connected, and the support leg 300 can be flipped outward to switch to a second state. Here, the first end and the last end of the arc-shaped groove 120 are opposite, representing the two ends of the arc-shaped groove 120, respectively. The curvature of the arc-shaped groove 120 limits the relative rotation angle between the seat 100 and the collar 200, serving as a reminder to the customer when the mounting groove 110 and the notch 210 are aligned or misaligned during rotation. Furthermore, the movable engagement between the arc-shaped groove 120 and the slider 220 is also a specific way to achieve a rotatable connection between the seat 100 and the collar 200. Therefore, the cooperation between the arc-shaped groove 120 and the slider 220 serves both the functions of rotatable connection and rotation angle limitation, achieving two functions with a single structure. It should be noted that, without considering rotation angle limitation, the presence or absence of the arc-shaped groove 120 and the slider 220 is not limited in this application; any structure that allows the collar 200 to rotatably fit onto the seat 100 should be included. For example, in other embodiments, a rotating shaft can also be used to achieve a rotatable connection between the seat 100 and the collar 200.

[0040] Preferably, in conjunction with reference Figure 6 and Figure 7 In one embodiment, the first and second ends of the arc-shaped groove 120 are respectively provided with a first slot 130 and a second slot 140. In the first state, the mounting groove 110 and the notch 210 are completely misaligned, and the slider 220 is engaged in the first slot 130 to limit the circumferential rotation of the collar 200 and maintain the stability of the first state. In the second state, the mounting groove 110 and the notch 210 are aligned and connected, and the slider 220 is engaged in the second slot 140 to limit the circumferential rotation of the collar 200 and maintain the stability of the second state. It should be noted that, without considering the stability of the first or second state, the presence or absence of the first slot 130 or the second slot 140 is not limited in this application.

[0041] Further, refer to Figure 6 and Figure 7In one embodiment, the bottom wall of the arcuate groove 120 is provided with at least one boss 150, which is located between the first slot 130 and the second slot 140, and serves to separate the first slot 130 and the second slot 140. The arcuate groove 120 is provided on the outer wall of the seat 100, and there is a gap between the upper surface of the boss 150 and the inner wall of the collar 200 along the depth direction of the arcuate groove 120; or, in another embodiment, the arcuate groove 120 may also be provided on the inner wall of the collar 200, and there is a gap between the upper surface of the boss 150 and the outer wall of the seat 100 along the depth direction of the arcuate groove 120. The aforementioned gap provides rotational clearance between the seat 100 and the collar 200, reduces rotational damping of both, and improves rotational smoothness. It should be noted that, firstly, the number of bosses 150 is not limited; secondly, without considering the smoothness of rotation, in this application, it is not limited whether there is a gap between the upper surface of the boss 150 and the inner wall of the collar 200; or, it is not limited whether there is a gap between the upper surface of the boss 150 and the outer wall of the seat 100.

[0042] Preferably, refer to Figure 6 In one embodiment, at least one of the outer wall of the first slot 130 and the outer wall of the slider 220 is provided with a first guide surface 131. The first guide surface 131 extends along the depth direction inclined to the arc groove 120. When the collar 200 rotates relative to the seat 100, the outer wall of the first slot 130 and the outer wall of the slider 220 move relative to each other along the first guide surface 131 until the slider 220 moves to be engaged in the first slot 130.

[0043] Preferably, refer to Figure 6 In one embodiment, at least one of the outer wall of the second slot 140 and the outer wall of the slider 220 is provided with a second guide surface 141. The second guide surface 141 extends along the depth direction inclined to the arc groove 120. When the collar 200 rotates relative to the seat 100, the outer wall of the second slot 140 and the outer wall of the slider 220 move relative to each other along the second guide surface 141 until the slider 220 moves to be engaged in the second slot 140.

[0044] Preferably, refer to Figure 6 In one embodiment, at least one of the inner sidewall of the first slot 130 and the outer sidewall of the slider 220 is provided with a third guide surface 132. The third guide surface 132 extends along the depth direction inclined to the arc groove 120. The third guide surface 132 and the first guide surface 131 extend and intersect (with different inclination directions). When the collar 200 rotates relative to the seat 100, the inner sidewall of the first slot 130 and the outer sidewall of the slider 220 move relative to each other along the third guide surface 132 until the slider 220 moves to disengage from the first slot 130.

[0045] Preferably, refer to Figure 6 In one embodiment, at least one of the inner sidewall of the second slot 140 and the outer sidewall of the slider 220 is provided with a fourth guide surface 142. The fourth guide surface 142 extends along the depth direction inclined to the arc groove 120, and the fourth guide surface 142 and the second guide surface 141 extend and intersect (with different inclination directions). When the collar 200 rotates relative to the seat 100, the inner sidewall of the second slot 140 and the outer sidewall of the slider 220 move relative to each other along the fourth guide surface 142 until the slider 220 moves to disengage from the second slot 140.

[0046] As described above, during the rotation of the collar 200 relative to the seat 100, the first guide surface 131 guides the assist slider 220 into the first slot 130, the second guide surface 141 guides the assist slider 220 into the second slot 140, the third guide surface 132 guides the assist slider 220 out of the first slot 130, and the fourth guide surface 142 guides the assist slider 220 out of the second slot 140. This reduces the rotational damping of the collar 200 relative to the seat 100 and enhances the smoothness of rotation. It should be understood that, without considering the smoothness of rotation, the presence or absence of the first guide surface 131, the second guide surface 141, the third guide surface 132, or the fourth guide surface 142 is not limited in this application.

[0047] Preferably, in conjunction with reference Figure 7 and Figure 8 The seat 100 extends outward from its two opposite ends along its thickness, with a first annular boss 160 and a second annular boss 170 protruding from opposite ends. When the collar 200 is fitted onto the outer wall of the seat 100, the collar 200 is simultaneously clamped and confined between the first annular boss 160 and the second annular boss 170. This enhances the assembly stability between the collar 200 and the seat 100. Furthermore, the annular groove formed by the two annular bosses (first annular boss 160 and second annular boss 170) is also a specific structural method for achieving the rotational fitting of the collar 200 onto the outer wall of the seat 100. Optionally, in other embodiments, the two annular bosses can also be provided on the inner wall of the collar 200, in which case the seat 100 is clamped between the two annular bosses, achieving the same stable assembly effect. It should be noted that the presence or absence of the two annular bosses is not limited without considering assembly stability. Optionally, refer to... Figure 6 Along the circumference of the base 100, the first annular boss 160 is in a continuous circular state, and the second annular boss 170 is cut into multiple arc-shaped blocks by the mounting groove 110. It should be noted that the shape of the first annular boss 160 or the second annular boss 170 is not limited, as long as they extend along the circumference of the base 100 and form annular clamping grooves at intervals along the thickness of the base 100, and the annular clamping grooves can clamp the stabilizing collar 200.

[0048] Preferably, in conjunction with reference Figure 1 and Figure 2 In one embodiment, the support leg 300 has a mounting arm 310 and a support arm 320 connected axially thereto. The mounting arm 310 is rotatably connected to the inner wall of the mounting groove 110 via a pivot 330. The radial dimension of the mounting arm 310 is smaller than the width of the opening of the mounting groove 110, so that the mounting arm 310 can be confined within the mounting groove 110. Figure 4 The radial dimension of the support arm 320 is larger than that of the mounting arm 310, so that the tripod body 12 can be arranged side by side in the closed state for the user to hold and use as a selfie stick. The pivot 330 passes through the inner sidewall of the mounting arm 310 and the mounting groove 110 in sequence. Optionally, the pivot 330 can be integrally formed by protruding from the opposite sides of the mounting arm 310, or the pivot 330 can exist independently of the mounting arm 310.

[0049] Preferably, in conjunction with reference Figure 1 and Figure 2 In one embodiment, in the first state, the multiple legs 300 are able to swing themselves into a side-by-side approaching posture. Figure 1 As shown), at this time, the mounting groove 110 and the notch 210 are misaligned, and there is a gap between the outer wall of the mounting groove 110 and the inner wall of the collar 200. This gap provides the mounting arm 310 with a swinging space to fold outward. The mounting arm 310 can swing outward to engage with the collar 200, and the multiple legs 300 can switch to the position shown. Figure 2 The image shows the extended state of the support frame. In this first state, the opening angle of the legs 300 is within a range, allowing the leg body 12 to switch between a side-by-side approaching posture and a support posture, thus increasing the overall usability of the support frame. Of course, in other embodiments, when in the side-by-side approaching posture, there may be no gap between the outer wall of the mounting groove 110 and the inner wall of the collar 200; the first state corresponds to the retracted and closed state of the leg body 12.

[0050] Preferably, refer to Figure 3In one embodiment, the depth of the notch 210 along the thickness direction of the base 11 is not less than the depth of the mounting groove 110. When the mounting groove 110 and the notch 210 are aligned, the support leg 300 can continue to fold outwards until multiple support legs 300 are in the same plane, defined as a flat position, so that the inner sidewall of the support leg 300 can be attached to the supporting plane, thereby increasing the support capacity of the bracket. Optionally, the inner sidewall of the support leg 300 is provided with a suction cup or a magnetic suction element. It should be noted that in this application, the depth of the notch 210 and the depth of the mounting groove 110 are not limited, and whether the support leg 300 can fold outwards to a flat position is not limited. It is only necessary to ensure that when the mounting groove 110 and the notch 210 are aligned, the support leg 300 can continue to swing and fold outwards.

[0051] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A mechanism for adjusting the opening and closing angle of a support, characterized in that, include: The base includes a seat body and a collar. The seat body has multiple circumferentially spaced mounting grooves. The collar is rotatably fitted around the side of the seat body. The collar has multiple circumferentially spaced notches. The number of mounting grooves is equal to the number of notches. Multiple support legs are rotatably connected to the inner wall of the mounting groove. The support legs can swing relative to the base body to switch between a first state and a second state. The opening and closing angle of the support legs in the first state is smaller than the opening and closing angle of the support legs in the second state. In the first state, the mounting groove and the notch are misaligned, and the outer side of the support leg abuts against the collar to limit the maximum opening angle of the support leg in the first state; the collar rotates relative to the seat body until the mounting groove and the notch are aligned, and the notch provides swing space for the support leg to continue to turn outward so that the support leg passes through the notch to switch to the second state, and the outer side of the support leg abuts against the inner sidewall of the notch to limit the maximum opening angle of the support leg in the second state.

2. The adjusting mechanism according to claim 1, characterized in that, One of the outer wall of the base and the inner wall of the collar is provided with an arc-shaped groove, and the other is provided with a slider. The arc-shaped groove extends circumferentially along the base. The slider is aligned and engaged in the arc-shaped groove. During the rotation of the collar relative to the base, the slider moves between the beginning and end of the arc-shaped groove. When the slider is located at the beginning of the arc-shaped groove, the mounting groove is misaligned with the notch. When the slider is located at the end of the arc-shaped groove, the mounting groove is aligned and connected with the notch.

3. The adjusting mechanism according to claim 2, characterized in that, The first and second slots are respectively provided at the beginning and end of the arc-shaped groove. In the first state, the mounting groove and the notch are completely misaligned, and the slider is engaged in the first slot. In the second state, the mounting groove and the notch are aligned, and the slider is engaged in the second slot.

4. The adjusting mechanism according to claim 3, characterized in that, The bottom wall of the arc-shaped groove is provided with at least one boss, and the boss is located between the first slot and the second slot; The arc-shaped groove is provided on the outer wall of the seat body, and there is a gap between the upper surface of the boss and the inner wall of the collar along the depth direction of the arc-shaped groove; or, the arc-shaped groove is provided on the inner wall of the collar, and there is a gap between the upper surface of the boss and the outer wall of the seat body along the depth direction of the arc-shaped groove.

5. The adjusting mechanism according to claim 3, characterized in that, At least one of the outer wall of the first slot and the outer wall of the slider is provided with a first guide surface. The first guide surface extends along the depth direction inclined to the arcuate groove. When the collar rotates relative to the seat, the outer wall of the first slot and the slider move relative to each other along the first guide surface until the slider moves to engage in the first slot; and / or, At least one of the outer wall of the second slot and the outer wall of the slider is provided with a second guide surface. The second guide surface extends along the depth direction of the arc-shaped groove. When the collar rotates relative to the seat, the outer wall of the second slot and the outer wall of the slider move relative to each other along the second guide surface until the slider moves to be engaged in the second slot.

6. The adjusting mechanism according to claim 3, characterized in that, At least one of the inner wall of the first slot and the outer wall of the slider is provided with a third guide surface. The third guide surface extends along the depth direction inclined to the arcuate groove. When the collar rotates relative to the seat, the inner wall of the first slot and the outer wall of the slider move relative to each other along the third guide surface until the slider moves to disengage from the first slot; and / or, At least one of the inner sidewall of the second slot and the outer sidewall of the slider is provided with a fourth guide surface. The fourth guide surface extends along the depth direction of the arc-shaped groove. When the collar rotates relative to the seat, the inner sidewall of the second slot and the outer sidewall of the slider move relative to each other along the fourth guide surface until the slider moves to disengage from the second slot.

7. The adjusting mechanism according to claim 1, characterized in that, The base extends outward from its two opposite ends along its thickness, forming a first annular boss and a second annular boss, respectively. The collar is clamped and confined between the first annular boss and the second annular boss. The first annular boss is in a continuous circular state along the circumference of the base, and the second annular boss is cut off by the mounting groove.

8. The adjusting mechanism according to claim 1, characterized in that, The outrigger has a mounting arm and a support arm connected along its axial direction. The mounting arm is rotatably connected to the inner wall of the mounting groove via a pivot. The radial dimension of the mounting arm is smaller than the width dimension of the mounting groove, and the radial dimension of the support arm is larger than the width dimension of the mounting groove.

9. The adjusting mechanism according to claim 8, characterized in that, The multiple legs can swing to a side-by-side and close together posture. When the mounting groove and the notch are misaligned, there is a gap between the outer wall of the mounting arm and the inner wall of the collar. The mounting arm can rotate outward to abut against the collar, and the multiple legs switch to the bracket unfolded state.

10. The adjusting mechanism according to claim 1, characterized in that, Along the thickness direction of the base, the depth dimension of the notch is not less than the depth dimension of the mounting groove. When the mounting groove is aligned with the notch, the support leg can continue to be turned outward until the inner sidewalls of multiple support legs are in the same plane, so that the inner sidewalls of the support leg can be attached to the support plane.

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