A telescopic and adjustable pole structure

Abstract

This utility model discloses a telescopic and adjustable pole structure, comprising: a front tube with upper and lower clamping sleeves at its upper and lower ends respectively, a lower clamping sleeve with a lower tie around its periphery, and an upper clamping sleeve with an upper tie around its periphery; the upper end of the front tube has a height adjustment hole; and a pole with a spring-loaded elastic body inside its lower end, the spring-loaded elastic body having a spring and an elastic body, the elastic body elastically pressing against the inner wall of the pole and providing elastic force to the spring, causing the spring to partially pass through the perforation at the lower end of the pole and protrude from the outer surface of the lower end of the pole; the lower end of the pole passes through the upper clamping sleeve and extends into the upper end of the front tube, the spring being held and positioned in the height adjustment hole under the elastic force of the elastic body to achieve a primary height lock, and the upper clamping sleeve being driven by the upper tie to clamp and fix to the lower end of the pole to form a secondary height lock, thereby achieving a balance between the convenience and stability of the pole in height adjustment, ensuring the stability and strength of the entire pole structure, and making it safer and more reliable to use.

Description

Technical fields:

[0001] This utility model relates to the technical field of pole products, and specifically to a telescopic and adjustable pole structure. Background technology:

[0002] Chinese utility model patent application number 202223160460.X discloses a carbon fiber upright for a scooter, comprising: a mounting base, a folding assembly at the upper end of the mounting base, a fixing ring fixedly mounted on the top of the folding assembly, an adjusting assembly fixedly mounted on the top of the fixing ring, an annular block fixedly connected to the upper end of the adjusting assembly, a telescopic rod fixedly connected to the upper end of the annular block, a connecting block fixedly mounted on the top of the telescopic rod, and a handle fixedly connected to the top of the connecting block. Handles are fixedly mounted at both ends of the handle. The folding assembly includes a connecting base and a fixing base. The lower end of the connecting base has a mounting groove, and a limit block is fixedly mounted on the top of the inner wall of the connecting base. Rotary shafts are movably connected to both sides of the connecting base, and a locking block is provided at one end of each rotary shaft. The adjusting assembly includes a sleeve with a groove inside. A lifting rod is disposed inside the groove, and several parallel adjusting holes are provided on one side of the lifting rod. Screws are inserted into the adjusting holes, and the cooperation between the adjusting holes and the screws allows the height of the upright to be fixed.

[0003] The aforementioned carbon fiber upright of the scooter can also be height-adjusted using an adjustment assembly. However, this assembly uses an adjustment hole and a screw to fix the upright's height. This means that to adjust the height, the screw needs to be screwed out, then the relative height of the sleeve and the lifting rod needs to be adjusted. Furthermore, the groove on the sleeve must be visually aligned with the adjustment hole on the lifting rod before the screw is reinserted and screwed into the adjustment hole for proper positioning. This operation is extremely cumbersome, and the small inner diameter of the sleeve makes this alignment difficult and inconvenient. Moreover, the adjustment assembly only uses an adjustment hole and a screw to fix the upright's height, which is a simple fixation method and its stability is not ideal.

[0004] In view of the above, the inventors propose the following technical solution. Utility Model Content:

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a telescopic and adjustable pole structure.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: The telescopically adjustable upright structure includes: a front tube, with an upper clamping sleeve and a lower clamping sleeve respectively provided at its upper and lower ends in a C-shape cross-section; a lower clamping sleeve is surrounded by a lower tie, and an upper clamping sleeve is surrounded by an upper tie; the upper end of the front tube also has several height adjustment holes spaced vertically, located below the upper tie; and an upright tube, with a projectile elastic body provided inside its lower end, the projectile elastic body having a projectile... The device includes a V-shaped elastic body that is fixedly connected to the projectile. This elastic body elastically presses against the inner wall of the riser and provides elastic force to the projectile, allowing it to partially pass through the perforation at the lower end of the riser and protrude onto the outer surface of the lower end of the riser. The lower end of the riser passes through the upper clamping sleeve and extends into the upper end of the front tube. Under the elastic force of the elastic body, the projectile is held and positioned in one of the height adjustment holes to achieve a first height lock. Furthermore, the upper clamping sleeve is driven to clamp and fix to the lower end of the riser by the upper clamping sleeve, forming a second height lock.

[0007] Furthermore, in the above technical solution, the outer opening of the height adjustment hole is provided with a rounded chamfer to reduce the sticking sensation when pressing the bullet.

[0008] Furthermore, in the above technical solution, the outer periphery of the rear end of the projectile is integrally formed with an outwardly extending flange, which abuts against the outer edge of the inner opening of the height adjustment hole to prevent the projectile from excessively penetrating the height adjustment hole, and the middle part of one end of the elastomer is integrally connected to the middle part of the rear end of the projectile.

[0009] Furthermore, in the above technical solution, the elastic body is a spring wire or spring sheet bent into a V-shape, which includes a first spring arm integrally connected to the rear end of the projectile, a second spring arm bent at the end of the first spring arm and distributed opposite to the first spring arm, and a stop portion integrally bent at the end of the second spring arm and used to prevent the projectile from being excessively compressed; after the elastic body is installed in the riser, the second spring arm contacts the inside of the riser, and the first spring arm and the second spring arm form a compressed state, and the stop portion is in a horizontal state and is horizontally oriented towards the rear end face of the projectile or the rear end face of the stop flange formed on the periphery of the rear end of the projectile.

[0010] Furthermore, in the above technical solution, the upper end of the riser is provided with a sliding groove extending along its length, and the lower end of the sliding groove is provided with an anti-detachment protrusion; the upper bundle is helically fixed with a limiting screw, and the end of the limiting screw is embedded in the sliding groove and located at the upper end of the anti-detachment protrusion, so as to prevent the riser from sliding upward relative to each other and detaching from the upper end of the front tube.

[0011] Furthermore, in the above technical solution, the upper clamping sleeve includes a first C-shaped sleeve sleeved outside the upper clamping sleeve, a first clamping end and a second clamping end passing through the outside of the first C-shaped sleeve, a first screw hole shaft screwed to the first screw hole shaft, and a first eccentric handle rotatably mounted outside the first screw hole shaft. The first C-shaped sleeve is provided with a thickened limiting block, the thickened limiting block is provided with a first screw hole penetrating the outer surface, the limiting screw is screwed to the first screw hole, and the thickened limiting block also falls into the sliding groove.

[0012] Furthermore, in the above technical solution, a washer is also provided on the outside of the first fastening screw, and the washer is placed between the second clamping end and the first eccentric handle.

[0013] Furthermore, in the above technical solution, the lower bundle is provided with a second screw hole on its outside, the lower clamping sleeve is provided with a positioning hole corresponding to the second screw hole, the headless screw is screwed and fixed in the second screw hole, and the end of the headless screw is also inserted in the positioning hole, so that the lower bundle is axially positioned relative to the lower clamping sleeve.

[0014] Furthermore, in the above technical solution, the lower clamping sleeve includes: a second C-shaped sleeve, which is sleeved on the outside of the lower clamping sleeve. The outer side of the second C-shaped sleeve has a third clamping end and a fourth clamping end opposite to each other. The third clamping end is provided with a plurality of third screw holes, and the fourth clamping end is provided with a plurality of holes corresponding to the third screw holes. A plurality of second fastening screws pass through the corresponding holes and are screwed to the third screw holes, so that the third clamping end and the fourth clamping end are brought close to each other to squeeze the lower clamping sleeve, so that the lower clamping sleeve contracts from the outside to the inside to achieve clamping.

[0015] Furthermore, in the above technical solution, the front tube has a first axially extending slot and a first round hole at the lower end of the first slot along its upper end surface, so that the section of the front tube with the first slot at its upper end is configured as the upper clamping sleeve that can be squeezed to achieve clamping; the front tube has a second axially extending slot and a second round hole at the lower end of the second slot along its lower end surface, so that the section of the front tube with the second slot at its lower end is configured as the lower clamping sleeve that can be squeezed to achieve clamping; both the lower clamp and the upper clamp are formed by profile processing.

[0016] After adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: After the riser is embedded in the front tube, it can slide to adjust the relative height of the two. When its height is adjusted to the predetermined height, the bullet is locked and positioned in one of the height adjustment holes under the elastic force of the elastic body, so as to achieve a primary height lock. That is, during the process of the riser sliding up and down relative to the front tube, the bullet will be squeezed from the outside to the inside to compress the elastic body until the bullet slides to one of the height adjustment holes. Under the elastic force of the compressed elastic body, the bullet is locked and positioned in one of the height adjustment holes. It does not require manual alignment, is convenient to use, and is extremely easy to operate. Later, the upper clamping sleeve is squeezed by the upper bundle to drive the upper clamping sleeve to clamp and fix with the lower end of the riser, forming a secondary height lock, thereby ensuring the stability of the locking structure. The operation is simple, realizing the unity of convenience and stability in height adjustment of the riser, ensuring the stability and strength of the entire riser structure, and making it safer and more reliable to use. In addition, the forward-leaning connection at the top of the pole improves riding comfort from an ergonomic perspective, making the pole structure not only meet functional requirements but also provide a good user experience and market application value. Attached image description:

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a perspective view of the present invention from another angle;

[0019] Figure 3 This is an exploded view of this utility model;

[0020] Figure 4 This is a cross-sectional view of the present invention. Detailed implementation method:

[0021] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0022] See Figure 1-4 As shown, a telescopic and adjustable pole structure includes: a front tube 1, a lower tie 2, an upper tie 3, a pole 4, a lower clamp 42, a locking screw 43, an upper clamp 44, and a spring-loaded elastic body 5.

[0023] The front tube 1 is provided with an upper clamping sleeve 11 and a lower clamping sleeve 12 with a C-shaped cross-section at its upper and lower ends, respectively. A lower clamping sleeve 12 is surrounded by a lower clamping sleeve 2, and an upper clamping sleeve 11 is surrounded by an upper clamping sleeve 3. The upper end of the front tube 1 is also provided with several height adjustment holes 13 spaced vertically, located below the upper clamping sleeve 3. The lower end of the vertical tube 4 contains the aforementioned bullet elastic body 5, which has a bullet 51 and a V-shaped elastic body 52 fixedly connected to the bullet 51. The body 52 elastically presses against the inner wall of the riser 4 and provides elastic force to the bullet 51, causing the bullet 51 to partially pass through the perforation 40 at the lower end of the riser 4 and be exposed on the outer surface of the lower end of the riser 4. The lower end of the riser 4 passes through the upper clamping sleeve 11 and extends into the upper end of the front tube 1, and can slide up and down. Under the elastic force of the elastic body 52, the bullet 51 is held and positioned in one of the height adjustment holes 13 to achieve a primary height lock. The upper clamping sleeve 11 is driven to be clamped and fixed to the lower end of the riser 4 by the upper clamping tuft 3, forming a secondary height lock. The lower clamping sleeve 12 is used to be sleeved on the outside of the front fork shaft and is clamped and fixed by the lower clamping tuft 2. In other words, after the riser 4 is embedded in the front tube 1, it can slide to adjust the relative height between the two. When its height is adjusted to the predetermined height, the bullet 51 is held and positioned in one of the height adjustment holes 13 under the elastic force of the elastic body 52, so as to achieve a first height lock. That is, during the process of the riser 4 sliding up and down relative to the front tube 1, the bullet 51 will be squeezed from the outside to the inside to compress the elastic body 52 until the bullet 51 slides to one of the height adjustment holes 13. Under the elastic force of the compressed elastic body 52, the bullet 51 is held and positioned in one of the height adjustment holes 13. It does not require manual alignment, is convenient to use, and is extremely easy to operate. Later, the upper clamping sleeve 11 is squeezed by the upper bundle 3 to drive the upper clamping sleeve 11 to clamp and fix with the lower end of the riser 4, forming a second height lock, thereby ensuring the stability of the locking structure. The operation is simple, realizing the unity of convenience and stability in height adjustment of the riser, ensuring the stability and strength of the entire riser structure, and making it safer and more reliable to use.

[0024] In addition, the upper part of the riser 4 is bent into an outwardly inclined connecting part 41. The lower clamp 42 is welded and fixed to the connecting part 41. The lower clamp 42 is connected to the upper clamp 44, which is used to clamp and fix the handle, by means of a locking screw 43. The forward-leaning connecting part 41 at the upper end of the riser improves riding comfort from an ergonomic point of view, so that the riser structure can meet functional requirements while also having a good user experience and market application value.

[0025] In this embodiment, there are three height adjustment holes 13, which can achieve three-level adjustment and increase the height adaptive adjustment when used by the user.

[0026] In this embodiment, the outer opening of the height adjustment hole 13 is provided with a rounded chamfer 131 to reduce the sticking sensation when pressing the bullet 51. The rounded chamfer 131 can not only reduce the wall thickness of the front tube 1 at the height adjustment hole 13, but also make it easier to press the bullet 51, which facilitates the smooth pressing and sliding of the bullet and reduces the sticking sensation when pressing the bullet 51.

[0027] The outer periphery of the rear end of the projectile 51 is integrally formed with an outwardly extending flange 511, which abuts against the outer edge of the inner opening of the height adjustment hole 13 to prevent the projectile 51 from excessively penetrating the height adjustment hole 13, and the middle part of one end of the elastic body 52 is integrally connected to the middle part of the rear end of the projectile 51.

[0028] The elastic body 52 is a spring wire or spring sheet bent into a V-shape, comprising a first spring arm 521 integrally connected to the rear end of the projectile 51, a second spring arm 522 bent at the end of the first spring arm 521 and distributed opposite to the first spring arm 521, and a stop portion 523 integrally bent at the end of the second spring arm 522 to prevent the projectile 51 from being excessively compressed; after the elastic body 52 is installed in the riser 4, the second spring arm 522 contacts the inside of the riser 4, and the first spring arm 522... A compressed state is formed between 521 and the second spring arm 522, and the stop 523 is in a horizontal state and is horizontally facing the rear end face of the bullet 51 or the rear end face of the stop edge 511 formed on the outer periphery of the rear end of the bullet 51. It can block the pressing of the bullet 51, thereby controlling the pressing stroke of the bullet 51 and preventing the bullet 51 from being pressed down excessively. This prevents the bullet 51 from being completely retracted into the riser tube 4 and unable to pass through the perforation 40 at the lower end of the riser tube 4 again, thus preventing the bullet elastic body 5 from working properly.

[0029] To ensure smoother sliding between the riser 4 and the front pipe 1 and to prevent them from detaching from each other, the following design is implemented: a sliding groove 45 extending along the length of the riser 4 is provided at its upper end, and an anti-detachment protrusion 46 is provided at the lower end of the sliding groove 45; a limiting screw 30 is screwed and fixed to the upper tie 3, and the end of the limiting screw 30 is embedded in the sliding groove 45 and located above the anti-detachment protrusion 46 to prevent the riser 4 from sliding upward relative to each other and detaching from the upper end of the front pipe 1, thereby making the sliding between the riser 4 and the front pipe 1 smoother and preventing them from detaching from each other.

[0030] In this embodiment, the upper clamp 3 includes a first C-shaped sleeve 31 sleeved outside the upper clamping sleeve 11, a first clamping end 311 and a second clamping end 312 passing through the outside of the first C-shaped sleeve 31, a first screw hole shaft 33 screwed and fixed to the first screw hole shaft 32, and a first eccentric handle 34 rotatably mounted outside the first screw hole shaft 33. The first C-shaped sleeve 31 is provided with a thickened limiting block 313, which is provided with a first screw hole 314 penetrating the outer surface. The limiting screw 30 is screwed and fixed in the first screw hole 314, and the thickened limiting block 313 also falls into the sliding groove 45, which also plays a good guiding role and can prevent circumferential rotation between the two.

[0031] The first fastening screw 32 is also fitted with a washer 35, which is placed between the second clamping end 312 and the first eccentric handle 34. This washer can reduce friction and improve the service life of the product.

[0032] The lower bundle 2 is provided with a second screw hole 20 on its outside. The lower clamping sleeve 12 is provided with a positioning hole 121 corresponding to the second screw hole 20. The headless screw 200 is screwed and fixed in the second screw hole 20, and the end of the headless screw 200 is also inserted in the positioning hole 121 so that the lower bundle 2 is axially positioned relative to the lower clamping sleeve 12.

[0033] The lower clamp 2 includes a second C-shaped sleeve 21 and a plurality of second fastening screws 22. The second C-shaped sleeve 21 is sleeved on the outside of the lower clamping sleeve 12. The outer side of the second C-shaped sleeve 21 has a third clamping end 211 and a fourth clamping end 212. The third clamping end 211 is provided with a plurality of third screw holes 213, and the fourth clamping end 212 is provided with a plurality of holes 214 corresponding to the third screw holes 213. The plurality of second fastening screws 22 pass through the holes 214 and are screwed into the third screw holes 213, so that the third clamping end 211 and the fourth clamping end 212 move closer to each other to squeeze the lower clamping sleeve 12, so that the lower clamping sleeve 12 contracts from the outside to the inside to achieve clamping.

[0034] The front tube 1 has a first slit 101 extending axially downward along its upper end surface and a first round hole 102 located at the lower end of the first slit 101, so that the section of the front tube 1 with the first slit 101 at its upper end is configured as the upper clamping sleeve 11 that can be squeezed to achieve clamping; the front tube 1 has a second slit 103 extending axially upward along its lower end surface and a second round hole 104 located at the lower end of the second slit 103, so that the section of the front tube 1 with the second slit 103 at its lower end is configured as the lower clamping sleeve 12 that can be squeezed to achieve clamping.

[0035] Considering practicality and economy, both the lower chuck 42 and the upper chuck 44 are formed by profile machining. The profile machining of the chuck not only ensures structural strength, but also reduces production costs by adapting to the diameter of commonly used handles.

[0036] In summary, after the riser 4 is embedded in the front tube 1, it can slide telescopically to adjust the relative height between the two. When its height is adjusted to the predetermined height, the bullet 51 is held and positioned in one of the height adjustment holes 13 under the elastic force of the elastic body 52, thus achieving a primary height lock. That is, during the process of the riser 4 sliding up and down relative to the front tube 1, the bullet 51 is squeezed from the outside to the inside to compress the elastic body 52 until the bullet 51 slides to one of the height adjustment holes 13. Under the elastic force of the compressed elastic body 52, the bullet 51 is held and positioned in one of the height adjustment holes 13. It does not require manual alignment, is convenient to use, and is extremely easy to operate. Later, the upper clamping sleeve 11 is squeezed by the upper bundle 3 to drive the upper clamping sleeve 11 to clamp and fix with the lower end of the riser 4, forming a secondary height lock, thereby ensuring the stability of the locking structure. The operation is simple, realizing the unity of convenience and stability in height adjustment of the riser, ensuring the stability and strength of the entire riser structure, and making it safer and more reliable to use. In addition, the forward-leaning connection part 41 at the top of the pole improves riding comfort from an ergonomic perspective, making the pole structure not only meet functional requirements but also have a good user experience and market application value.

[0037] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A telescopic adjustable upright structure, characterized by: It includes: The front tube (1) has an upper clamping sleeve (11) and a lower clamping sleeve (12) with a C-shaped cross-section at its upper and lower ends, respectively. The lower clamping sleeve (12) is surrounded by a lower bundle (2), and the upper clamping sleeve (11) is surrounded by an upper bundle (3). The upper end of the front tube (1) is also surrounded by several height adjustment holes (13) that are spaced apart vertically. The height adjustment holes (13) are located below the upper bundle (3). The riser (4) has a bullet elastic body (5) inside its lower end. The bullet elastic body (5) has a bullet (51) and an elastic body (52) fixedly connected to the bullet (51) and in a V-shape. The elastic body (52) elastically presses against the inner wall of the riser (4) and provides elastic force to the bullet (51), so that the bullet (51) partially passes through the perforation (40) at the lower end of the riser (4) and is exposed on the outer surface of the lower end of the riser (4). The lower end of the riser (4) passes through the upper clamping sleeve (11) and extends into the upper end of the front tube (1). The bullet (51) is held and positioned in one of the height adjustment holes (13) under the elastic force of the elastic body (52) to achieve a first height lock. The upper clamping sleeve (11) is squeezed by the upper bundle (3) to drive the upper clamping sleeve (11) to clamp and fix with the lower end of the riser (4) to form a second height lock.

2. A telescopic adjustable upright structure according to claim 1, characterised in that: The height adjustment hole (13) has a rounded chamfer (131) on its outer opening to reduce the sticking sensation when pressing the bullet (51); the upper part of the riser (4) is bent into an outwardly inclined connecting part (41), and a lower clamp (42) is welded and fixed to the connecting part (41). An upper clamp (44) that cooperates to clamp and fix the handle is connected to the lower clamp (42) by a locking screw (43).

3. A telescopic adjustable upright structure according to claim 1, wherein: The projectile (51) has an integrally formed flange (511) extending outward around its rear end. The flange (511) abuts against the edge of the inner opening of the height adjustment hole (13) to prevent the projectile (51) from excessively passing through the height adjustment hole (13). The middle part of one end of the elastomer (52) is integrally connected to the middle part of the rear end of the projectile (51).

4. A telescopic adjustable upright structure according to claim 3, wherein: The elastic body (52) is a spring wire or spring sheet bent into a V shape. It includes a first spring arm (521) integrally connected to the rear end of the bullet (51), a second spring arm (522) bent into the end of the first spring arm (521) and distributed opposite to the first spring arm (521), and a stop (523) integrally bent into the end of the second spring arm (522) and used to prevent the bullet (51) from being excessively compressed. After the elastic body (52) is installed in the riser (4), the second spring arm (522) contacts the inside of the riser (4), and the first spring arm (521) and the second spring arm (522) form a compressed state. The stop (523) is in a horizontal state and is horizontally facing the rear end face of the bullet (51) or the rear end face of the flange (511) formed on the periphery of the rear end of the bullet (51).

5. A telescopic adjustable upright structure according to any one of claims 1 to 4, wherein: The upper end of the riser (4) is provided with a sliding groove (45) extending along its length, and the lower end of the sliding groove (45) is provided with an anti-detachment protrusion (46); the upper bundle (3) is screwed with a limiting screw (30), and the end of the limiting screw (30) is embedded in the sliding groove (45) and located at the upper end of the anti-detachment protrusion (46) to prevent the riser (4) from sliding upward relative to the upper end of the front tube (1).

6. A telescopic adjustable upright structure according to claim 5, wherein: The upper clamp (3) includes a first C-shaped sleeve (31) sleeved outside the upper clamping sleeve (11), a first clamping end (311) and a second clamping end (312) passing through the outside of the first C-shaped sleeve (31), a first screw hole shaft (33) screwed and fixed to the first clamping screw (32), and a first eccentric handle (34) rotatably mounted outside the first screw hole shaft (33). The first C-shaped sleeve (31) is provided with a thickened limiting block (313), and the thickened limiting block (313) is provided with a first screw hole (314) penetrating the outer surface. The limiting screw (30) is screwed and fixed in the first screw hole (314), and the thickened limiting block (313) also falls into the sliding groove (45).

7. The telescopically adjustable upright structure according to claim 6, characterized in that: The first fastening screw (32) is also fitted with a washer (35), which is placed between the second clamping end (312) and the first eccentric handle (34).

8. A telescopic adjustable upright structure according to any one of claims 1 to 4, wherein: The lower bundle (2) is provided with a second screw hole (20) on the outside, and the lower clamping sleeve (12) is provided with a positioning hole (121) corresponding to the second screw hole (20). A headless screw (200) is screwed and fixed in the second screw hole (20), and the end of the headless screw (200) is also inserted in the positioning hole (121) so that the lower bundle (2) is axially positioned relative to the lower clamping sleeve (12).

9. A telescopic adjustable upright construction according to claim 8, characterized in that: The lower bundle (2) includes: The second C-shaped sleeve (21) is sleeved outside the lower clamping sleeve (12). The outer side of the second C-shaped sleeve (21) has a third clamping end (211) and a fourth clamping end (212). The third clamping end (211) is provided with a plurality of third screw holes (213), and the fourth clamping end (212) is provided with a plurality of holes (214) corresponding one-to-one with the third screw holes (213). Multiple second fastening screws (22) pass through the holes (214) one by one and are screwed to the third screw hole (213) to make the third clamping end (211) and the fourth clamping end (212) approach each other to squeeze the lower clamping sleeve (12), so that the lower clamping sleeve (12) shrinks from the outside to the inside to achieve clamping.

10. A telescopic adjustable upright structure according to claim 2, wherein: The front tube (1) has a first slit (101) extending downward along its upper end and a first round hole (102) located at the lower end of the first slit (101), so that the section of the front tube (1) with the first slit (101) at its upper end is configured as the upper clamping sleeve (11) that can be squeezed to achieve clamping. The front tube (1) has an axially extending second slot (103) and a second round hole (104) located at the lower end of the second slot (103) so that the section of the front tube (1) with the second slot (103) at the lower end is configured as the lower clamping sleeve (12) that can be squeezed to achieve clamping. Both the lower chuck (42) and the upper chuck (44) are formed by machining profiles.

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