Locking structure of sunshade

Abstract

A locking structure of a sunshade umbrella, comprising a load-bearing rod, a guide joint rotatably arranged at the top of the load-bearing rod, and a locking sleeve movably arranged on the load-bearing rod; the outer circumferential surface of the lower end of the guide joint is provided with a first circumferential locking structure, and the inner circumferential wall of the locking sleeve is provided with a second circumferential locking structure matched with the first circumferential locking structure. The second circumferential locking structure and the first circumferential locking structure are mutually embedded by moving the locking sleeve upward, so as to limit the rotation of the guide joint relative to the load-bearing rod; the two are disengaged by moving the locking sleeve downward, so as to allow the guide joint to rotate around the axis of the load-bearing rod. The structure realizes the firm locking of the guide joint through mechanical embedding, effectively solves the problem of unexpected rotation under external force caused by the dependence on friction or simple positioning structure in the prior art, ensures the stable position of the sunshade umbrella after adjustment, and the locking and unlocking operation can be completed only by moving the locking sleeve upward and downward, which is simple and easy to operate and does not affect the original 360-degree rotation function of the sunshade umbrella.

Description

Technical Field

[0001] This utility model relates to the field of sunshade technology, specifically to a locking structure for a sunshade. Background Technology

[0002] Outdoor parasols, widely used in courtyards, terraces, commercial streets, and other sunshade applications, have always prioritized ease of use and functional adaptability as key aspects of industry development. With increasing user demands for flexibility in sunshade coverage, parasols with multi-angle adjustable canopies are becoming mainstream. Among these, parasols capable of 360-degree rotation around a support pole are particularly popular due to their ability to provide all-around sun protection without requiring a moving base.

[0003] In the prior art, for example, the Chinese utility model patent application number 202420172728.1 (authorization announcement number CN221635184U) discloses "A 360-degree rotatable sunshade", which improves the stability during rotation by setting a guide joint and movable seat that can rotate around the axis of the load-bearing rod, and with the support device, achieves 360-degree coverage of the umbrella surface. At the same time, it has the characteristics of simple installation structure and convenient turning operation, effectively solving the drawback of traditional sunshades that require moving the base to adjust the position.

[0004] However, in actual use, when the sunshade is adjusted to a specific rotation angle, although the movable seat can be fixed in position through its built-in locking structure, the rotation locking of the guide joint mainly relies on the mating friction between it and the load-bearing rod or a simple positioning structure. When subjected to external forces (such as strong winds, collisions, etc.), the guide joint may unexpectedly rotate and shift, causing the sunshade position of the umbrella surface to deviate from the preset range, affecting the sunshade effect; at the same time, after long-term use, wear and tear on the mating structure may exacerbate this problem and even pose a safety hazard.

[0005] Therefore, how to further optimize the stability of rotation positioning based on the existing 360-degree rotating sun umbrella, and ensure that the umbrella surface can be stably locked after being adjusted to the target angle, has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a locking structure for a sunshade that, in view of the above-mentioned technical status, provides a locking sleeve that can move up and down on the load-bearing rod, can achieve a firm lock after the guide joint is rotated to a set position, is easy to operate, and does not affect the original rotation function of the sunshade.

[0007] The technical solution adopted by this utility model to solve the first technical problem is as follows: the locking structure of the sunshade includes a load-bearing rod and a guide joint rotatably disposed on the top of the load-bearing rod, and also includes a locking sleeve, which is movably sleeved on the load-bearing rod.

[0008] The outer circumferential surface at the lower end of the guide joint is provided with a first circumferential locking structure, and the inner circumferential wall of the locking sleeve is provided with a second circumferential locking structure that is adapted to the first circumferential locking structure.

[0009] When the locking sleeve is in the upward position, the second circumferential locking structure and the first circumferential locking structure are interlocked, restricting the guide joint from rotating relative to the load-bearing rod;

[0010] When the locking sleeve is in the downward position, the second circumferential locking structure is disengaged from the first circumferential locking structure, allowing the guide joint to rotate around the axis of the load-bearing rod.

[0011] To limit the circumferential rotation of the locking sleeve relative to the load-bearing rod and ensure that the locking sleeve can only move up and down along the load-bearing rod to accurately lock or unlock, preferably, a guide structure is provided between the load-bearing rod and the locking sleeve to limit the circumferential rotation of the locking sleeve relative to the load-bearing rod. The guide structure only allows the locking sleeve to move up and down along the load-bearing rod.

[0012] In order to make the circumferential restriction of the locking sleeve by the guide structure more stable and reliable through the adaptation structure, and to ensure the guiding accuracy when the locking sleeve moves up and down, preferably, the guide structure includes a guide sleeve sleeved on the outer periphery of the load-bearing rod, a first guide structure is formed on the outer peripheral surface of the guide sleeve, and a second guide structure adapted to the first guide structure is formed on the inner peripheral wall of the locking sleeve.

[0013] The first guide structure is a first groove or a first rib formed on the outer peripheral surface of the guide sleeve and extending vertically, and the second guide structure is a first rib or a first groove formed on the inner peripheral wall of the locking sleeve.

[0014] Alternatively, the first guide structure is a first outer polygon formed on the outer peripheral surface of the guide sleeve, and the second guide structure is a first inner polygon formed on the inner peripheral wall of the locking sleeve and adapted to the first outer polygon.

[0015] In order to utilize the elastic force of the return spring to keep the locking sleeve in the upward locking state when no external force is applied, thereby improving the ease of use and limiting the excessive upward movement of the locking sleeve, preferably, a return spring is also included, and a radially protruding flange is formed between the second circumferential locking structure and the second guide structure of the locking sleeve.

[0016] The return spring is sleeved on the outer periphery of the load-bearing rod, with its lower end abutting against the upper end face of the guide sleeve and its upper end abutting against the bottom of the flange. The return spring always applies an upward elastic force to the locking sleeve.

[0017] When the locking sleeve is moved to the locked state, the top of the flange abuts against the bottom of the guide joint, restricting the locking sleeve from moving further upward.

[0018] In order to increase the contact area between the guide joint and the locking sleeve, making the locking more stable and improving the precision of the angle adjustment, preferably, the first circumferential locking structure and the second circumferential locking structure are in the following form: one is a plurality of second ribs that are evenly distributed along the circumference and vertically arranged, and the other is a plurality of second grooves that are evenly distributed along the circumference and adapted to the second ribs.

[0019] Alternatively, the first circumferential locking structure is a second outer polygon formed on the outer circumferential surface of the lower end of the guide joint, and the second circumferential locking structure is a second inner polygon formed on the inner circumferential wall of the locking sleeve.

[0020] To increase the friction between the hand and the locking sleeve, making it easier for the user to move the locking sleeve up and down in wet or slippery environments or when wearing gloves, preferably, the outer peripheral surface of the locking sleeve is provided with anti-slip textures to increase friction.

[0021] To optimize the structure of the guide joint, the umbrella surface can be adjusted at multiple angles by hinged connection between the rotating seat and the movable sleeve, while enhancing the stability of the guide joint during rotation. Preferably, the guide joint includes a rotating seat and a movable sleeve. The rotating seat is fitted onto the top of the load-bearing rod, and the movable sleeve is hinged to the rotating seat via a pin. The bottom of the rotating seat is provided with a downwardly extending support device that extends into the load-bearing rod. The first circumferential locking structure is formed on the outer circumferential surface of the rotating seat.

[0022] To further improve the stability and smoothness of the guide joint when rotating inside the load-bearing rod, preferably, the support device includes a support inner tube and a support sleeve. The support inner tube is connected to the rotating seat from bottom to top, and the support sleeve is fitted on the outer circumferential surface of the support inner tube, and the outer circumferential surface of the support sleeve can slide against the inner circumferential wall of the load-bearing rod.

[0023] To better limit the radial movement of the inner support tube and provide axial support for the rotating seat, thereby improving the overall rotational stability and structural strength of the guide joint, preferably, the top opening of the load-bearing rod is provided with an annular limiting sleeve. The inner circumferential wall of the limiting sleeve is fitted to the outer circumferential surface of the inner support tube and can rotate relative to it. The top of the limiting sleeve is radially formed with an annular flange, which is pressed against the top of the load-bearing rod, and the rotating seat is pressed against the annular flange.

[0024] To enhance the stability of the fit between the inner support tube and the inner circumferential wall of the load-bearing rod, prevent the inner support tube from shaking, and achieve a firm connection between the support sleeve and the inner support tube, preferably, at least two support sleeves are provided, each of which is spaced apart along the length of the inner support tube, and the support sleeves are connected and fixed to the inner support tube by fasteners.

[0025] Compared with the prior art, the advantages of this utility model are as follows: By setting a locking sleeve that can move up and down on the load-bearing rod, and setting a first circumferential locking structure on the outer circumferential surface of the lower end of the guide joint, and setting a second circumferential locking structure adapted to the first circumferential locking structure on the inner circumferential wall of the locking sleeve, when the locking sleeve is in the upward state, the second circumferential locking structure and the first circumferential locking structure are interlocked, which can restrict the rotation of the guide joint relative to the load-bearing rod; when the locking sleeve is in the downward state, the second circumferential locking structure and the first circumferential locking structure are disengaged, allowing the guide joint to rotate around the axis of the load-bearing rod. This structure achieves a firm lock on the guide joint through mechanical interlocking, effectively avoiding the problem of unexpected rotation under external force caused by friction or simple positioning structure in the prior art, ensuring the positional stability of the sunshade after adjustment. At the same time, the locking and unlocking operations can be completed simply by moving the locking sleeve up and down, which is simple to operate and does not affect the original 360-degree rotation function of the sunshade. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of Example 1;

[0027] Figure 2 This is a schematic diagram of the decomposed state structure of Example 1;

[0028] Figure 3 This is a cross-sectional view of Example 1 (the locking sleeve is in the upward locking state);

[0029] Figure 4 This is a cross-sectional view of Example 1 (the locking sleeve is in the lowered unlocked state);

[0030] Figure 5 This is a three-dimensional structural diagram of the locking sleeve in Example 1;

[0031] Figure 6 This is a cross-sectional schematic diagram of the mating structure between the locking sleeve and the guide joint in Example 1;

[0032] Figure 7 This is a cross-sectional schematic diagram of the mating structure of the locking sleeve and the guide sleeve in Example 1;

[0033] Figure 8 This is a schematic diagram of the decomposed state structure of Example 2;

[0034] Figure 9 This is a three-dimensional structural diagram of the locking sleeve in Example 2;

[0035] Figure 10 This is a cross-sectional schematic diagram of the mating structure between the locking sleeve and the guide joint in Example 2;

[0036] Figure 11 This is a cross-sectional schematic diagram of the mating structure of the locking sleeve and the guide sleeve in Example 2. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0038] like Figures 1-11 As shown, this is the preferred embodiment of the present invention. The present invention aims to solve the problem that in existing 360-degree rotatable sunshades, after the angle is adjusted, the rotation locking of the guide joint mainly relies on the frictional force between it and the load-bearing rod or a simple positioning structure. When subjected to external force, it is prone to unexpected rotational displacement, affecting the sunshade effect and posing safety hazards. Its overall structure, through a specially designed locking mechanism, achieves a firm fixation of the guide joint after the rotation position is adjusted, without affecting the original 360-degree rotation function.

[0039] This utility model provides two embodiments, the core difference of which lies in the locking fit structure of the guide joint and the locking sleeve and the guiding fit structure of the guide sleeve and the locking sleeve. The structures and connections of other components are basically the same. The two embodiments are described in detail below.

[0040] Example 1

[0041] Figures 1 to 7 As shown, this is Embodiment 1 of the present invention. The locking structure of the sunshade in Embodiment 1 mainly includes a load-bearing rod 1, a guide joint 2, a locking sleeve 3, a guide structure 4, a return spring 5, a support device 6, and a limiting sleeve 7, etc.

[0042] The structure and connection relationship of each core component in Example 1 are as follows:

[0043] Load-bearing bar 1: Reference Figure 1 and Figure 2 As shown, the load-bearing rod 1 serves as the supporting foundation for the entire sunshade. It is vertically positioned with an open top and a hollow interior to accommodate the support device 6. A locking sleeve 3 and a guide structure 4 are appropriately fitted around its outer periphery to provide a mounting platform for each component. The load-bearing rod 1 can be integrally molded from high-strength aluminum alloy, ensuring structural strength to withstand the umbrella body and external loads (such as wind force), while also reducing overall weight through lightweight design for easy handling and installation.

[0044] Guide joint 2: Reference Figure 1 and Figure 2 As shown, the guide joint 2 is rotatably mounted on the top of the load-bearing rod 1, including a rotating seat 2b and a movable sleeve 2c. The rotating seat 2b is fitted onto the top of the load-bearing rod 1, and its lower outer circumferential surface is formed with a first circumferential locking structure 2a. In embodiment 1, the first circumferential locking structure 2a consists of 12 second ribs that are evenly distributed circumferentially and arranged vertically. Each second rib has a guide surface with an inclination of 3° on both sides, and the guide surface gradually slopes inward from the top to the bottom of the rib. The movable sleeve 2c is hinged to the rotating seat 2b through a pin 2d and is used to connect the suspension rod of the umbrella body to realize the adjustment of the umbrella surface pitch angle. The bottom of the rotating seat 2b is provided with a downwardly extending support device 6, which extends into the interior of the load-bearing rod 1 to provide stable support for the rotation of the guide joint 2.

[0045] Locking sleeve 3: Reference Figures 3 to 5 As shown, the locking sleeve 3 is movably fitted onto the load-bearing rod 1. Its inner circumferential wall has a second circumferential locking structure 3a adapted to the first circumferential locking structure 2a. In Embodiment 1, the second circumferential locking structure 3a consists of 12 vertically arranged second grooves evenly distributed circumferentially, each corresponding to a second rib. Each second groove also has a guide surface with a 3° inclination on both sides, with the guide ridge aligned with the inclination direction of the guide surface. A second guide structure 3b is also provided on the inner circumferential wall of the locking sleeve 3 below the second circumferential locking structure 3a. In Embodiment 1, the second guide structure 3b is a vertically arranged first groove evenly distributed circumferentially. A radially protruding flange 3c is formed between the second circumferential locking structure 3a and the second guide structure 3b. This flange 3c abuts against the return spring 5 and the guide joint 2, realizing the functions of elastic force transmission and limiting. The outer circumferential surface of the locking sleeve 3 is provided with evenly distributed anti-slip raised textures 3d, which can increase the friction between the hand and the locking sleeve 3, making it easier for the user to operate the locking sleeve up and down in wet and slippery environments (such as rainy days) or when wearing gloves, thus improving ease of use; the specific cooperation structure between the first circumferential locking structure 2a and the second circumferential locking structure 3a in Embodiment 1 can be found in [reference]. Figure 6 As shown.

[0046] Guide Structure 4: Reference Figures 2 to 4As shown, the guide structure 4 is disposed between the load-bearing rod 1 and the locking sleeve 3, including a guide sleeve 4a sleeved on the outer periphery of the load-bearing rod 1; a first guide structure 4a1 is formed on the outer peripheral surface of the guide sleeve 4a. In embodiment 1, the first guide structure 4a1 is a first protruding rib that is evenly distributed circumferentially and arranged vertically. The first guide structure 4a1 is adapted to the second guide structure 3b of the locking sleeve 3 to restrict the circumferential rotation of the locking sleeve 3 relative to the load-bearing rod 1, allowing only the locking sleeve 3 to move up and down along the load-bearing rod 1, ensuring the accuracy of locking and unlocking actions. The guide sleeve 4a and the load-bearing rod 1 are fixedly connected by radial screws. The end of the screw is embedded in a pre-set positioning hole on the outer periphery of the load-bearing rod 1, which can prevent the guide sleeve 4a from sliding axially or rotating circumferentially along the load-bearing rod 1, ensuring the stability of the relative position of the guide structure 4 and the load-bearing rod 1. The matching structure of the first guide structure 4a1 and the second guide structure 3b in embodiment 1 can be referred to Figure 7 As shown.

[0047] Return spring 5: Reference Figure 2 and Figure 5 As shown, the return spring 5 is sleeved on the outer periphery of the load-bearing rod 1, with its lower end abutting against the upper end face of the guide sleeve 4a and its upper end abutting against the bottom of the flange 3c of the locking sleeve 3. The return spring 5 is always in a compressed state, applying an upward elastic force to the locking sleeve 3, so that the locking sleeve 3 remains locked when no external force is applied, improving ease of use. The return spring 5 can be made of piano wire and manufactured through a heat treatment process, which has a high elastic limit and fatigue strength, and can maintain stable elastic performance in long-term repeated compression and rebound cycles, avoiding the locking sleeve 3 from failing to automatically return due to spring failure.

[0048] Support device 6: Reference Figures 2 to 4 As shown, the support device 6 includes an inner support tube 6a and a support sleeve 6b. The inner support tube 6a is fixedly connected to the rotating seat 2b from bottom to top and rotates synchronously with the rotating seat 2b. The support sleeve 6b is fitted onto the outer circumferential surface of the inner support tube 6a. In embodiment 1, two support sleeves 6b are provided, and the two support sleeves 6b are arranged at intervals along the length direction of the inner support tube 6a. Both the support sleeve 6b and the inner support tube 6a have mounting holes on their side walls for fasteners 8 (such as bolts) to pass through, and the two are fixedly connected by the fasteners 8. The outer circumferential surface of the support sleeve 6b can slide against the inner circumferential wall of the load-bearing rod 1, reducing the shaking when the guide joint 2 rotates and improving stability. The support sleeve 6b is injection molded from nylon material, and its outer circumferential surface is precision machined to ensure that the fit clearance with the inner circumferential wall of the load-bearing rod 1 is controlled within a set range. This reduces rotational resistance and reduces frictional loss with the inner circumferential wall of the load-bearing rod through its own wear resistance. At the same time, the shock absorption characteristics of the nylon material can buffer the slight vibration when the guide joint rotates.

[0049] Limiter Set 7: Reference Figure 2 and Figure 3As shown, the limiting sleeve 7 is annular and located within the top opening of the load-bearing rod 1. Its inner circumferential wall fits against the outer circumferential surface of the supporting inner tube 6a and can rotate relative to it. A radially formed annular flange 7a is formed on the top of the limiting sleeve 7. The annular flange 7a presses against the top of the load-bearing rod 1, and the rotating seat 2b presses against the annular flange 7a, providing axial limiting for the rotating seat 2b and preventing the guide joint 2 from falling off the top of the load-bearing rod 1. The annular flange 7a of the limiting sleeve 7 can buffer the pressure of the rotating seat 2b on the load-bearing rod 1, avoiding wear and abnormal noise caused by direct contact between metal parts, while also enhancing the sealing of the connection between the two, preventing rainwater, dust, and other impurities from entering the interior of the load-bearing rod 1.

[0050] The working principle of the locking structure of the sunshade in Example 1 is as follows:

[0051] 1. Locking Process: Under the elastic force of the return spring 5, the locking sleeve 3 always tends to move upward. When the guide joint 2 is adjusted to the target rotation angle, the locking sleeve 3 moves upward, and its second circumferential locking structure 3a (second groove) engages with the first circumferential locking structure 2a (second rib) of the guide joint 2, restricting the circumferential rotation of the guide joint 2 relative to the load-bearing rod 1. At this time, the top of the flange 3c abuts against the bottom of the guide joint 2, restricting the locking sleeve 3 from moving further upward, achieving a firm lock and avoiding unexpected rotation under external force. Since there are 12 second ribs and 12 second grooves in Embodiment 1, they can achieve angular positioning at 30-degree intervals when they are engaged. This state can be specifically referred to... Figure 3 As shown.

[0052] 2. Unlocking Process: When adjusting the rotation angle of the sunshade, pull down the locking sleeve 3 to overcome the elasticity of the return spring 5 and move it downwards until the second circumferential locking structure 3a (second groove) is completely disengaged from the first circumferential locking structure 2a (second rib). At this time, the guide joint 2 is unlocked and can rotate 360 ​​degrees around the axis of the load-bearing rod 1. The support sleeve 6b of the support device 6 slides along the inner circumferential wall of the load-bearing rod 1, ensuring smooth and stable rotation. During unlocking, the downward stroke of the locking sleeve 3 is limited by the height of the guide sleeve 4a and the maximum compression of the return spring 5, ensuring that the second circumferential locking structure 3a can completely disengage from the first circumferential locking structure 2a, avoiding rotational jamming caused by residual contact. For details, please refer to [reference needed]. Figure 4 As shown.

[0053] 3. Guiding and limiting: During the up and down movement of the locking sleeve 3, the guide sleeve 4a of the guide structure 4 cooperates with the second guide structure 3b (first groove) of the locking sleeve 3 through the first guide structure 4a1 (first protruding rib) to restrict the circumferential rotation of the locking sleeve 3, ensuring that the second circumferential locking structure 3a and the first circumferential locking structure 2a are accurately aligned, thereby improving the reliability of locking and unlocking.

[0054] Example 2

[0055] Figures 8-11 As shown, this is Embodiment 2 of the present invention. Embodiment 2 is basically the same as Embodiment 1 in structure and working principle. The core difference lies in the locking fit structure between the guide joint and the locking sleeve, and the guide fit structure between the guide sleeve and the locking sleeve adopts a polygonal design. The specific differences are as follows:

[0056] refer to Figure 8 and Figure 9 As shown, the lower outer circumferential surface of the rotating seat 2b of the guide joint 2 is formed with a first circumferential locking structure 2a. In embodiment 2, the first circumferential locking structure 2a is a second outer polygon formed on the lower outer circumferential surface of the rotating seat 2b, specifically a regular dodecagon. The inner circumferential wall of the locking sleeve 3 is provided with a second circumferential locking structure 3a that matches the first circumferential locking structure 2a. In embodiment 2, the second circumferential locking structure 3a is a second inner polygon formed on the inner circumferential wall of the locking sleeve 3, and the outline of the second inner polygon matches the outline of the second outer polygon. The specific mating structure of the first circumferential locking structure 2a and the second circumferential locking structure 3a in embodiment 2 can be found in [reference]. Figure 10 As shown.

[0057] The outer peripheral surface of the guide sleeve 4a has a first guide structure 4a1. In embodiment 2, the first guide structure 4a1 is a first outer polygon formed on the outer peripheral surface of the guide sleeve 4a. The second guide structure 3b of the locking sleeve 3 is a first inner polygon formed on the inner peripheral wall of the locking sleeve 3 and adapted to the first outer polygon. The mating structure of the first guide structure 4a1 and the second guide structure 3b in embodiment 2 can be referred to... Figure 11 As shown.

[0058] The working principle of the locking structure of the sunshade in Example 2 is as follows:

[0059] 1. Locking process: When the locking sleeve 3 moves upward, its second circumferential locking structure 3a (second inner polygon) is sleeved on the first circumferential locking structure 2a (second outer polygon) of the guide joint 2. The rotation of the guide joint 2 relative to the load-bearing rod 1 is restricted by the cooperation of the polygons. Due to the adoption of a regular dodecagonal design, the two can achieve angular positioning at 30-degree intervals when they are in cooperation.

[0060] 2. Guiding and limiting: The guide sleeve 4a cooperates with the second guide structure 3b (first inner polygon) of the locking sleeve 3 through the first guide structure 4a1 (first outer polygon) to restrict the circumferential rotation of the locking sleeve 3, ensure the precise alignment of the first inner polygon and the first outer polygon, and ensure the smooth up and down movement of the locking sleeve 3.

[0061] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are merely 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. The terms "installation," "connection," and "linking" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of 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 locking structure for a sunshade umbrella, comprising a load-bearing rod (1) and a guide joint (2) rotatably disposed on the top of the load-bearing rod (1), characterized in that: It also includes a locking sleeve (3), which is movably fitted onto the load-bearing rod (1); The guide joint (2) has a first circumferential locking structure (2a) on its lower outer circumferential surface, and the locking sleeve (3) has a second circumferential locking structure (3a) adapted to the first circumferential locking structure (2a) on its inner circumferential wall. When the locking sleeve (3) is in the upward position, the second circumferential locking structure (3a) and the first circumferential locking structure (2a) are interlocked to restrict the guide joint (2) from rotating relative to the load-bearing rod (1); When the locking sleeve (3) is in a downward state, the second circumferential locking structure (3a) and the first circumferential locking structure (2a) are disengaged from each other, allowing the guide joint (2) to rotate around the axis of the load-bearing rod (1).

2. The locking structure of the sunshade umbrella according to claim 1, characterized in that: A guide structure (4) is provided between the load-bearing rod (1) and the locking sleeve (3) to restrict the circumferential rotation of the locking sleeve (3) relative to the load-bearing rod (1). The guide structure (4) only allows the locking sleeve (3) to move up and down along the load-bearing rod (1).

3. The locking structure of the sunshade umbrella according to claim 2, characterized in that: The guide structure (4) includes a guide sleeve (4a) sleeved on the outer periphery of the load-bearing rod (1), a first guide structure (4a1) is formed on the outer periphery of the guide sleeve (4a), and a second guide structure (3b) adapted to the first guide structure (4a1) is formed on the inner periphery of the locking sleeve (3). The first guide structure (4a1) is a first groove or a first rib formed on the outer peripheral surface of the guide sleeve (4a) and extending vertically, and the second guide structure (3b) is a first rib or a first groove formed on the inner peripheral wall of the locking sleeve (3). Alternatively, the first guide structure (4a1) is a first outer polygon formed on the outer peripheral surface of the guide sleeve (4a), and the second guide structure (3b) is a first inner polygon formed on the inner peripheral wall of the locking sleeve (3) and adapted to the first outer polygon.

4. The locking structure of the sunshade umbrella according to claim 3, characterized in that: It also includes a return spring (5), and a radially protruding flange (3c) is formed between the second circumferential locking structure (3a) and the second guide structure (3b) of the locking sleeve (3); The return spring (5) is sleeved on the outer periphery of the load-bearing rod (1), with its lower end abutting the upper end face of the guide sleeve (4a) and its upper end abutting the bottom of the flange (3c). The return spring (5) always applies an upward elastic force to the locking sleeve (3). When the locking sleeve (3) is moved to the locked state, the top of the flange (3c) abuts against the bottom of the guide joint (2), restricting the locking sleeve (3) from moving further upward.

5. The locking structure of the sunshade umbrella according to claim 1, characterized in that: The first circumferential locking structure (2a) and the second circumferential locking structure (3a) are in the following forms: one is a plurality of second protruding ribs that are evenly distributed along the circumference and vertically arranged, and the other is a plurality of second grooves that are evenly distributed along the circumference and adapted to the second protruding ribs. Alternatively, the first circumferential locking structure (2a) is a second outer polygon formed on the outer circumferential surface of the lower end of the guide joint (2), and the second circumferential locking structure (3a) is a second inner polygon formed on the inner circumferential wall of the locking sleeve (3).

6. The locking structure of the sunshade umbrella according to claim 1, characterized in that: The outer peripheral surface of the locking sleeve (3) is provided with anti-slip texture (3d) to increase friction.

7. The locking structure of the sunshade according to any one of claims 1 to 6, characterized in that: The guide joint (2) includes a rotating seat (2b) and a movable sleeve (2c). The rotating seat (2b) is sleeved on the top of the load-bearing rod (1). The movable sleeve (2c) is hinged to the rotating seat (2b) through a pin (2d). The bottom of the rotating seat (2b) is provided with a downwardly extending support device (6). The support device (6) extends into the inside of the load-bearing rod (1). The first circumferential locking structure (2a) is formed on the outer circumferential surface of the rotating seat (2b).

8. The locking structure of the sunshade umbrella according to claim 7, characterized in that: The support device (6) includes a support inner tube (6a) and a support sleeve (6b). The support inner tube (6a) is connected to the rotating seat (2b) from bottom to top. The support sleeve (6b) is sleeved on the outer circumferential surface of the support inner tube (6a), and the outer circumferential surface of the support sleeve (6b) can slide against the inner circumferential wall of the load-bearing rod (1).

9. The locking structure of the sunshade according to claim 8, characterized in that: The top opening of the load-bearing rod (1) is provided with an annular limiting sleeve (7). The inner peripheral wall of the limiting sleeve (7) is attached to the outer peripheral surface of the supporting inner tube (6a) and can rotate relative to it. The top of the limiting sleeve (7) is formed with an annular flange (7a) in the radial direction. The annular flange (7a) is pressed on the top of the load-bearing rod (1), and the rotating seat (2b) is pressed on the annular flange (7a).

10. The locking structure of the sunshade according to claim 8, characterized in that: At least two support sleeves (6b) are provided, and each support sleeve (6b) is arranged at intervals along the length direction of the inner support tube (6a), and the support sleeve (6b) and the inner support tube (6a) are connected and fixed by fasteners (8).

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