Locking device and walking aid

Abstract

The utility model discloses a locking device and walking aid, locking device includes locking sleeve, adjusting assembly and clamp assembly, locking sleeve opposite both ends form first end and second end respectively, and the inside is formed with the connecting passage, the connecting passage has the inner tube connecting portion and outer tube connecting portion, the inner tube connecting portion is close to first end portion and sets, and the inner tube connecting portion is used for with telescopic pipe's inner tube spare connection, the outer tube connecting portion is close to second end portion and sets, and the outer tube connecting portion is used for with telescopic pipe's outer tube spare connection, clamp assembly sets up in the inner tube connecting portion, and clamp assembly is used for providing radial locking force for telescopic pipe, adjusting assembly sets up in the outer tube connecting portion, and adjusting assembly is used for providing axial locking force for telescopic pipe, the utility model discloses can improve the connecting stability between telescopic pipe inner and outer tube spare, improve walking aid handrail part's stability, avoid shaking, eliminate the potential safety hazard.

Description

Technical Field

[0001] This utility model relates to the field of walking aid technology, specifically to a locking device and a walking aid. Background Technology

[0002] A walking aid (also known as a wheeled walker, wheeled walker, or rollerator) is a wheeled mobility aid primarily designed for older adults or those recovering from illness who require additional support to maintain balance and stability or who are prone to fatigue. It offers greater freedom of movement and convenience than traditional wheelless walkers or underarm canes.

[0003] Walking aids generally consist of a frame and a handlebar assembly. The handlebar assembly is the most direct and crucial component in contact with the user's body, directly affecting comfort, safety, and pushing efficiency. To accommodate users of different heights, the handlebar assembly of walking aids is typically height-adjustable. Most walking aids use a telescopic tube structure for height adjustment, where the height of the handlebar assembly is adjusted by the relative sliding between interlocking inner and outer tubes. To allow the inner tube to move smoothly up and down within the outer tube, a clearance is designed between the tubes. However, this clearance can easily increase over time due to frequent height adjustments, vibrations during pushing, load-bearing, lateral impacts or falls, and manufacturing tolerances. After a period of use, a small, radial sway space develops between the inner and outer tubes, causing the handlebar to wobble, affecting stability, and creating safety hazards. Utility Model Content

[0004] To overcome the shortcomings of the prior art, one objective of this utility model is to provide a locking device that can improve the connection stability between the inner and outer pipes of the telescopic tube; another objective of this utility model is to provide a walking aid that can improve the stability of the walking aid's handrail components, prevent swaying, and eliminate safety hazards.

[0005] One of the objectives of this utility model is achieved through the following technical solution: A locking device, characterized in that it includes a locking sleeve, an adjusting assembly, and a clamp assembly; The locking sleeve has a first end and a second end at opposite ends, and a connecting channel is formed inside. The connecting channel has an inner tube connecting part and an outer tube connecting part. The inner tube connecting part is located near the first end and is used to connect with the inner tube fitting of the telescopic tube. The outer tube connecting part is located near the second end and is used to connect with the outer tube fitting of the telescopic tube. The clamp assembly is disposed at the inner tube connection part, and the clamp assembly is used to provide radial locking force for the telescopic tube; The adjustment component is disposed at the outer tube connection part, and the adjustment component is used to provide axial locking force for the telescopic tube.

[0006] In one optional embodiment, a first compression slit is formed on the inner tube connection portion, and the first compression slit is arranged along the axial direction of the locking sleeve; a first elastic arm and a second elastic arm are respectively connected to both sides of the first compression slit.

[0007] In one optional embodiment, the free end of the first elastic arm is provided with a first connecting ear, and the first connecting ear is provided with a first through hole; the free end of the second elastic arm is connected with a second connecting ear, and the second connecting ear is provided with a second through hole. The clamp assembly includes a connecting screw and a buckle. The connecting screw passes through the first through hole and the second through hole. A nut is screwed to one end of the connecting screw, and the other end is hinged to the buckle. The buckle can rotate between a first angle and a second angle. A first abutment portion and a second abutment portion are formed on the buckle. When the buckle rotates to the first angle, the first abutment portion abuts against the first connecting ear, and the first connecting ear and the second connecting ear move away from each other. When the buckle rotates to the second angle, the second abutment portion abuts against the first connecting ear, and the first connecting ear and the second connecting ear move closer together.

[0008] In one optional embodiment, an arc-shaped guide surface is formed on the first connecting lug, and the arc-shaped guide surface is disposed on the contact surface with the buckle; a rubber protective sleeve is provided on the nut at the end of the connecting screw.

[0009] In one optional embodiment, a second compression slit is formed on the inner tube connection portion, and the second compression slit is arranged along the axial direction of the locking sleeve; a third elastic arm and a fourth elastic arm are respectively connected to both sides of the second compression slit. The clamp assembly includes a clamp strip, which is wrapped around the outer periphery of the inner tube connection part. The clamp strip has a third connecting ear and a fourth connecting ear at both ends. The third connecting ear has a third through hole and the fourth connecting ear has a fourth through hole. The clamp assembly further includes a connecting screw and a buckle. The connecting screw passes through the third through hole and the fourth through hole. A nut is screwed to one end of the connecting screw, and the other end is hinged to the buckle. The buckle can rotate between a first angle and a second angle. A first abutting part and a second abutting part are formed on the buckle. When the buckle rotates to the first angle, the first abutting part abuts against the first connecting ear. At this time, the first connecting ear and the second connecting ear move away from each other, and the third connecting ear and the fourth connecting ear move away from each other. When the buckle rotates to the second angle, the second abutting part abuts against the first connecting ear. At this time, the first connecting ear and the second connecting ear move closer together, and the third connecting ear and the fourth connecting ear move closer together.

[0010] In one optional embodiment, the outer tube connection portion is provided with a snap-fit ​​seat, and a first pin hole is formed in the snap-fit ​​seat; The adjustment component includes a button and a limiting pin. The button is hinged to the buckle seat, and the two ends of the button form a pressing part and a limiting part, respectively. One end of the limiting pin is hinged to the limiting part, and the other end extends through the first pin hole into the connecting channel.

[0011] In one optional embodiment, a second pin hole is formed in the buckle seat; The adjustment assembly also includes an elastic element and a positioning pin; one end of the positioning pin extends through the second pin hole into the connecting channel, and the other end is connected to the pressing part through the elastic element; the elastic element provides elastic force to drive the limiting pin into the limiting hole of the inner tube of the telescopic tube.

[0012] In one optional embodiment, a limiting step is formed in the connecting channel, the limiting step is disposed between the inner tube connecting part and the outer tube connecting part, and the limiting step is used to limit the end of the outer tube of the telescopic tube.

[0013] In one optional embodiment, the cross-section of the connecting channel is elliptical, and the first compression joint and the second compression joint are respectively located at both ends of the major axis of the ellipse.

[0014] The second objective of this utility model is achieved by the following technical solution: A walking aid, characterized in that it includes a frame component, a handrail component, and a locking device as described in any one of the objectives of this utility model; The handrail component is connected to the frame component via a telescopic tube; the telescopic tube includes an inner tube and an outer tube that are nested together; the locking device is located at the connection between the outer tube and the inner tube.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The locking device of this utility model locks the relative positions of the locking sleeve and the outer and inner pipe fittings through the adjusting component, restricting the axial sliding of the inner pipe fitting and providing axial locking force for the telescopic pipe; the clamping component locks the relative positions of the locking sleeve and the inner pipe fitting, restricting the radial sway of the inner pipe fitting and providing radial locking force for the telescopic pipe, thus achieving double locking; the locking device of this utility model can provide an additional, adjustable radial clamping force after axial positioning is completed, eliminating the gap between the inner and outer pipes caused by manufacturing tolerances or wear, improving the connection stability between the inner and outer pipe fittings of the telescopic pipe, effectively eliminating swaying, and reducing the risk of accidents.

[0016] 2. The walking aid of this utility model can greatly improve the stability of the handrail components through the locking device, achieving an ultimate sense of stability with "zero wobbling" and an ultra-long service life, which can effectively meet the needs of users of mid-to-high-end walking aid products who have higher requirements for quality. Attached Figure Description

[0017] Figure 1 This is a perspective view of the locking device in Embodiment 1; Figure 2 This is a front view of the locking device in Embodiment 1; Figure 3 This is a cross-sectional view of section AA of the locking device in Example 1; Figure 4 This is a schematic diagram showing the usage state of the locking device in Example 1; Figure 5 This is a top view of the locking device in Embodiment 1; Figure 6 This is a schematic diagram of the control assembly of the locking device in Embodiment 1; Figure 7 This is a schematic diagram of the locking sleeve of the locking device in Embodiment 1; Figure 8 This is a perspective view of the locking device in Embodiment 2; Figure 9 This is a schematic diagram of the locking sleeve of the locking device in Embodiment 2; Figure 10 This is a schematic diagram of the walking aid vehicle in Example 3.

[0018] In the diagram: 10. Locking sleeve; 11. Connecting channel; 12. Inner tube connection; 121. First compression joint; 122. First elastic arm; 123. Second elastic arm; 124. First connecting ear; 125. Second connecting ear; 126. Second compression joint; 127. Third elastic arm; 128. Fourth elastic arm; 13. Outer tube connection; 131. Buckle seat; 132. First pin hole; 133. Second pin hole; 14. Limiting step; 20. Clamp assembly; 2 1. Connecting screw; 22. Turning buckle; 221. First abutting part; 222. Second abutting part; 231. Rubber protective sleeve; 24. Clamp strip; 241. Third connecting ear; 242. Fourth connecting ear; 30. Adjustment component; 31. Button; 311. Pressing part; 312. Limiting part; 32. Limiting pin; 33. Elastic element; 34. Positioning pin; 80. Frame component; 90. Handrail component; 91. Telescopic tube; 911. Inner tube; 912. Outer tube. Detailed Implementation

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0023] Example 1: Please refer to Figure 1-7This embodiment provides a locking device, including a locking sleeve 10, and an adjusting assembly 30 and a clamp assembly 20 installed on the locking sleeve 10. The locking device of this embodiment is mainly used to lock the telescopic tube 91. The telescopic tube 91 generally includes an inner tube 911 and an outer tube 912 that are sleeved on each other, and the inner tube 911 can move relative to the outer tube 912 along its axis. The axial / radial direction referred to in this embodiment can be understood as the length direction / width direction of the telescopic tube 91, which can be understood by those skilled in the art.

[0024] In this embodiment, the locking sleeve 10 has a first end and a second end at opposite ends, and a connecting channel 11 is formed inside. The connecting channel 11 has an inner tube connecting part 12 and an outer tube connecting part 13. The inner tube connecting part 12 is located near the first end and is used to connect with the inner tube fitting 911 of the telescopic tube 91. The outer tube connecting part 13 is located near the second end and is used to connect with the outer tube fitting 912 of the telescopic tube 91. The clamp assembly 20 is disposed on the inner tube connection part 12. The clamp assembly 20 is used to lock the locking sleeve 10 and the inner tube fitting 911 of the telescopic tube 91, and to provide radial locking force for the telescopic tube 91. The adjustment component 30 is disposed on the outer tube connection part 13. The adjustment component 30 is used to lock the locking sleeve 10 with the outer tube fitting 912 and inner tube fitting 911 of the telescopic tube 91, and to provide axial locking force for the telescopic tube 91. Based on the above structure, in use, the locking sleeve 10 is placed between the inner tube 911 and the outer tube 912 of the telescopic tube 91. The end of the outer tube 912 passes through the second end of the locking sleeve 10 into the outer tube connection part 13, and the end of the inner tube 911 passes through the first end of the locking sleeve 10 into the inner tube connection part 12 and extends into the outer tube 912. After adjusting to a suitable height, the relative positions of the locking sleeve 10, the outer tube 912, and the inner tube 911 are locked by the adjusting component 30, restricting the axial sliding of the inner tube 911, thus securing the telescopic tube. 91 provides axial locking force; the clamp assembly 20 locks the relative position of the locking sleeve 10 and the inner tube 911, restricting the radial sway of the inner tube 911 and providing radial locking force for the telescopic tube 91, thus achieving double locking; the locking device of this embodiment can provide an additional, adjustable radial clamping force after axial positioning is completed, eliminating the gap between the inner and outer tubes caused by manufacturing tolerances or wear, improving the connection stability between the inner and outer tubes (911, 912) of the telescopic tube 91, effectively eliminating sway, and reducing the risk of accidents.

[0025] Specifically, a first compression slit 121 is formed on the inner tube connection portion 12, and the first compression slit 121 is arranged along the axial direction of the locking sleeve 10; a first elastic arm 122 and a second elastic arm 123 are respectively connected to both sides of the first compression slit 121; the first compression slit 121 is compressed by the clamp assembly 20, so that the first elastic arm 122 and the second elastic arm 123 move closer to the connecting channel 11, so that the inner tube connection portion 12 is radially compressed, and the inner tube component 911 of the telescopic tube 91 is locked in the connecting channel 11 in a clamping manner.

[0026] The free end of the first elastic arm 122 is provided with a first connecting ear 124, and a first through hole is provided on the first connecting ear 124. The free end of the second elastic arm 123 is connected with a second connecting ear 125, and a second through hole is provided on the second connecting ear 125. The clamp assembly 20 includes a connecting screw 21 and a swivel 22. The connecting screw 21 passes through the first through hole and the second through hole. One end of the connecting screw 21 is screwed with a nut, and the other end is hinged to the swivel 22. This allows the swivel 22 to rotate between a first angle and a second angle. The end of the swivel 22 has a cam-like structure, namely, a first abutting part 221 and a second abutting part 222 are formed on the swivel 22. When the swivel 22 rotates to the first angle, the first abutting part 221 abuts against the first connecting ear 124. At this time, the first connecting ear 124 and the second connecting ear 125 move away from each other, unlocking the inner tube 911 of the telescopic tube 91. When the swivel 22 rotates to the second angle, the second abutting part 222 abuts against the first connecting ear 124. At this time, the first connecting ear 124 and the second connecting ear 125 move closer together, locking the inner tube 911 of the telescopic tube 91. Furthermore, an arc-shaped guide surface is formed on the first connecting ear 124. The arc-shaped guide surface is disposed on the contact surface with the swivel 22. The arc-shaped guide surface can provide guidance for the end of the swivel 22 during rotation. In this embodiment, the swivel 22 utilizes a lever handle and a cam structure to achieve quick locking and quick release, making it very convenient and labor-saving to operate.

[0027] In this embodiment, a rubber protective sleeve 231 is provided on the nut at the end of the connecting screw 21. The soft rubber protective sleeve 231 provides protection and avoids injury from bumps and knocks.

[0028] In this embodiment, the outer tube connection part 13 is provided with a buckle seat 131, and a first pin hole 132 and a second pin hole 133 are formed in the buckle seat 131. The adjustment component 30 includes a button 31 and a limiting pin 32. The button 31 is hinged to the buckle seat 131, and the two ends of the button 31 form a pressing part 311 and a limiting part 312, respectively. One end of the limiting pin 32 is hinged to the limiting part 312, and the other end extends through the first pin hole 132 into the connecting channel 11.

[0029] The adjustment assembly 30 also includes an elastic element 33 and a positioning pin 34; one end of the positioning pin 34 extends through the second pin hole 133 into the connecting channel 11; the end of the positioning pin 34 that extends into the connecting channel 11 can be inserted into the corresponding hole of the outer tube 912 of the telescopic tube 91, thereby fixing the locking sleeve 10 to the end of the outer tube 912.

[0030] The other end of the positioning pin 34 is connected to the pressing part 311 through the elastic element 33. The positioning pin 34 can be circumferentially provided with a limiting block to restrict the excessive displacement of the positioning pin 34 into the connecting channel 11. One end of the elastic element 33 abuts against the inner wall of the pressing part 311 of the button 31, and the other end abuts against the limiting block circumferentially of the positioning pin 34 of the buckle seat 131. The elastic element 33 provides elastic force to drive the limiting pin 32 into the limiting hole of the inner tube 911 of the telescopic tube 91, helping the button 31 to quickly reset.

[0031] Furthermore, a limiting step 14 is formed in the connecting channel 11. The limiting step 14 is disposed between the inner tube connecting part 12 and the outer tube connecting part 13. The limiting step 14 is used to limit the end of the outer tube fitting 912 of the telescopic tube 91. The locking sleeve 10 can be quickly positioned to the end of the outer tube fitting 912 through the limiting step 14.

[0032] In use, pressure is applied to the pressing part 311 to rotate the button 31, causing the limiting pin 32 to disengage from the limiting hole of the inner tube 911 of the telescopic tube 91, thus releasing the axial restriction of the inner tube 911. After adjusting the position of the inner tube 911, the button 31 is released, and the limiting pin 32 is reset under the elastic force of the elastic element 33, with its end extending into the corresponding limiting hole of the inner tube 911 of the telescopic tube 91, thus limiting the axial displacement of the inner tube 911. Subsequently, by rotating the buckle 22, the inner tube 911 of the telescopic tube 91 is locked in the connecting channel 11 in a pivot manner, limiting its radial displacement. The locking device of this embodiment achieves a high degree of integration and functional unity of adjustment and locking functions, realizing an ultimate sense of stability with "zero shaking" and an ultra-long service life, which can effectively meet the needs of users with higher quality requirements.

[0033] Example 2: Please refer to Figure 8-9 This embodiment provides a locking device based on embodiment 1. This embodiment provides another implementation of the clamp assembly 20. Compared with embodiment 1, this embodiment can provide a more balanced and effective radial locking force to the telescopic tube 91.

[0034] Specifically, a first compression slit 121 and a second compression slit 126 are formed on the inner tube connecting part 12. In this embodiment, the cross-section of the connecting channel 11 is elliptical, and the first compression slit 121 and the second compression slit 126 are respectively located at both ends of the major axis of the ellipse.

[0035] The first compression slot 121 is arranged along the axial direction of the locking sleeve 10; a first elastic arm 122 and a second elastic arm 123 are respectively connected to both sides of the first compression slot 121; the second compression slot 126 is arranged along the axial direction of the locking sleeve 10; a third elastic arm 127 and a fourth elastic arm 128 are respectively connected to both sides of the second compression slot 126. By compressing the first compression gap 121 and the second compression gap 126 through the clamp assembly 20, the first elastic arm 122, the second elastic arm 123, the third elastic arm 127 and the fourth elastic arm 128 can simultaneously move closer to the connecting channel 11, so that the inner tube connecting part 12 is radially compressed, and the inner tube part 911 of the telescopic tube 91 is locked in the connecting channel 11 in a clamping manner.

[0036] The clamp assembly 20 of this embodiment includes a clamp strip 24. The outer periphery of the inner tube connecting part 12 can be provided with a matching groove. The clamp strip 24 is wrapped around the outer periphery of the inner tube connecting part 12. The two ends of the clamp strip 24 respectively form a third connecting ear 241 and a fourth connecting ear 242. The third connecting ear 241 is provided with a third through hole, and the fourth connecting ear 242 is provided with a fourth through hole. The clamp assembly 20 further includes a connecting screw 21 and a swivel 22. The connecting screw 21 passes through the third through hole and the fourth through hole. One end of the connecting screw 21 is screwed with a nut, and the other end is hinged to the swivel 22. The swivel 22 can rotate between a first angle and a second angle. A first abutment portion 221 and a second abutment portion 222 are formed on the swivel 22. When the swivel 22 rotates to the first angle, the first abutment portion 221 abuts against the first connecting lug 124. At this time, the first connecting lug 124... 4. When the second connecting ear 125 is moved away from the third connecting ear 241 and the fourth connecting ear 242, the inner tube 911 of the telescopic tube 91 is unlocked; when the buckle 22 is rotated to the second angle, the second abutting part 222 abuts against the first connecting ear 124. At this time, the first connecting ear 124 and the second connecting ear 125 are close together, and the third connecting ear 241 and the fourth connecting ear 242 are close together. At the same time, the first compression seam 121 and the second compression seam 126 are compressed, locking the inner tube 911 of the telescopic tube 91.

[0037] In other embodiments, a third compression seam, a fourth compression seam, or even better compression seams can be provided. Multiple compression seams are evenly distributed around the inner tube connection part 12 to provide multi-directional shaft locking function in sequence. Those skilled in the art can set them according to actual needs.

[0038] Example 3: Please refer to Figure 10 This embodiment provides a walking aid, including a frame component 80, a handrail component 90, and a locking device as described in either embodiment 1 or 2; The handrail component 90 is connected to the frame component 80 via a telescopic tube 91; the telescopic tube 91 includes an inner tube 911 and an outer tube 912 that are nested together; the locking device is located at the connection between the outer tube 912 and the inner tube 911.

[0039] The walking aid in this embodiment can significantly improve the stability of the handlebar components 90 through the locking device, achieving an ultimate sense of stability with "zero wobbling" and an ultra-long service life, which can effectively meet the needs of users of mid-to-high-end walking aid products who have higher requirements for quality.

[0040] Although certain components and embodiments of this application have been illustrated and described, many modifications and alterations (e.g., variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.) will be conceived by those skilled in the art without actually departing from the scope and spirit of the claims.

[0041] Finally, it should be noted that the above embodiments are only preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A locking device, characterized in that, Includes locking sleeve, adjusting assembly, and clamp assembly; The locking sleeve has a first end and a second end at opposite ends, and a connecting channel is formed inside. The connecting channel has an inner tube connecting part and an outer tube connecting part. The inner tube connecting part is located near the first end and is used to connect with the inner tube fitting of the telescopic tube. The outer tube connecting part is located near the second end and is used to connect with the outer tube fitting of the telescopic tube. The clamp assembly is disposed at the inner tube connection part, and the clamp assembly is used to provide radial locking force for the telescopic tube; The adjustment component is disposed at the outer tube connection part, and the adjustment component is used to provide axial locking force for the telescopic tube.

2. The locking device according to claim 1, characterized in that, A first compression slit is formed on the inner tube connection portion, and the first compression slit is arranged along the axial direction of the locking sleeve; a first elastic arm and a second elastic arm are respectively connected to both sides of the first compression slit.

3. A locking device according to claim 2, characterized in that, The free end of the first elastic arm is provided with a first connecting ear, and the first connecting ear is provided with a first through hole; the free end of the second elastic arm is connected with a second connecting ear, and the second connecting ear is provided with a second through hole. The clamp assembly includes a connecting screw and a buckle. The connecting screw passes through the first through hole and the second through hole. A nut is screwed to one end of the connecting screw, and the other end is hinged to the buckle. The buckle can rotate between a first angle and a second angle. A first abutment portion and a second abutment portion are formed on the buckle. When the buckle rotates to the first angle, the first abutment portion abuts against the first connecting ear, and the first connecting ear and the second connecting ear move away from each other. When the buckle rotates to the second angle, the second abutment portion abuts against the first connecting ear, and the first connecting ear and the second connecting ear move closer together.

4. A locking device according to claim 3, characterized in that, The first connecting lug has an arc-shaped guide surface, which is located on the contact surface with the buckle; a rubber protective sleeve is provided on the nut at the end of the connecting screw.

5. A locking device according to claim 2, characterized in that, A second compression slit is formed on the inner tube connection part, and the second compression slit is arranged along the axial direction of the locking sleeve; a third elastic arm and a fourth elastic arm are respectively connected to both sides of the second compression slit. The clamp assembly includes a clamp strip, which is wrapped around the outer periphery of the inner tube connection part. The clamp strip has a third connecting ear and a fourth connecting ear at both ends. The third connecting ear has a third through hole and the fourth connecting ear has a fourth through hole. The clamp assembly further includes a connecting screw and a buckle. The connecting screw passes through the third through hole and the fourth through hole. A nut is screwed to one end of the connecting screw, and the other end is hinged to the buckle. The buckle can rotate between a first angle and a second angle. A first abutting part and a second abutting part are formed on the buckle. When the buckle rotates to the first angle, the first abutting part abuts against the first connecting ear. At this time, the first connecting ear and the second connecting ear move away from each other, and the third connecting ear and the fourth connecting ear move away from each other. When the buckle rotates to the second angle, the second abutting part abuts against the first connecting ear. At this time, the first connecting ear and the second connecting ear move closer together, and the third connecting ear and the fourth connecting ear move closer together.

6. A locking device according to claim 1, characterized in that, The outer tube connection part is provided with a buckle seat, and a first pin hole is formed in the buckle seat; The adjustment component includes a button and a limiting pin. The button is hinged to the buckle seat, and the two ends of the button form a pressing part and a limiting part, respectively. One end of the limiting pin is hinged to the limiting part, and the other end extends through the first pin hole into the connecting channel.

7. A locking device according to claim 6, characterized in that, A second pin hole is formed inside the buckle seat; The adjustment assembly also includes an elastic element and a positioning pin; one end of the positioning pin extends through the second pin hole into the connecting channel, and the other end is connected to the pressing part through the elastic element; the elastic element provides elastic force to drive the limiting pin into the limiting hole of the inner tube of the telescopic tube.

8. A locking device according to claim 1, characterized in that, A limiting step is formed within the connecting channel. The limiting step is located between the inner tube connection and the outer tube connection, and is used to limit the end of the outer tube of the telescopic tube.

9. A locking device according to claim 5, characterized in that, The cross-section of the connecting channel is elliptical, and the first compression joint and the second compression joint are respectively located at both ends of the major axis of the ellipse.

10. A walking aid, characterized in that, Includes frame components, armrest components, and locking devices as described in any one of claims 1-9; The handrail component is connected to the frame component via a telescopic tube; the telescopic tube includes an inner tube and an outer tube that are nested together; the locking device is located at the connection between the outer tube and the inner tube.

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