Stable crutch telescopic rod

Abstract

The invention discloses a stable walking stick telescopic rod, and belongs to the technical field of walking sticks, the stable walking stick telescopic rod comprises an outer pipe, a telescopic inner pipe, a locking mechanism, a telescopic limiter and a telescopic limiting rod, limiting protrusions are distributed on the telescopic limiting rod at intervals in the extending direction of a rod body, and a through hole and an anti-rotation limiting groove are formed in the end face of the telescopic limiter; the telescopic limiting rod is located in the outer pipe, the lower end of the telescopic limiting rod is fixed to a fixing piece at the lower end of the outer pipe, the telescopic limiter is inserted into the telescopic limiting rod in a penetrating mode and fixed to the lower end of the telescopic inner pipe, the lower end of the telescopic inner pipe is inserted into the outer pipe in a penetrating mode, and the upper end of the telescopic inner pipe is located outside the outer pipe. And the locking mechanism is used for locking and fixing the telescopic inner pipe on the outer pipe. The structure is simple, the number of parts is small, the overall weight is reduced, the use comfort of a user is improved, durability is achieved, the service life is prolonged, and meanwhile the beneficial effects of being easy and convenient to operate and low in cost are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of walking sticks, and more particularly to a stable walking stick telescopic rod. Background Art

[0002] Telescopic walking sticks, as a convenient walking aid, are widely popular in the market. The patent document with the publication number CN106726367A discloses a telescopic walking stick, which has the following features: a handle for the user to hold, with a switch provided at a predetermined position; a battery tube connected to the handle for accommodating a battery, which is electrically connected to the switch; an outer tube connected to the battery tube; a motor disposed inside one end of the outer tube close to the battery tube and electrically connected to the battery; a lead screw disposed inside the outer tube, including a screw rod and a nut, the screw rod being fixedly connected to the rotating shaft of the motor, a screw rod external thread being provided in the middle section of the screw rod, the nut being provided with a nut internal thread and a nut external thread, the nut internal thread matching the screw rod external thread; an inner tube partially inserted into the outer tube, with an inner tube thread matching the nut external thread provided on the inner wall, and moving inside the outer tube driven by the lead screw. In the telescopic walking stick provided by the present invention, it may further have the following features: wherein, the lead screw further includes a fixing member and a first spring, the fixing member being installed at one end of the screw rod close to the motor; one end of the first spring is connected to the fixing member, and the other end is connected to the upper end surface of the nut for pressing against the nut to prevent it from disengaging from the upper end of the screw rod external thread. In the telescopic walking stick provided by the present invention, it may further have the following features: wherein, the fixing member is a fixing block or a fixing nut. In the telescopic walking stick provided by the present invention, it may further have the following features: it further includes an inner tube rotation limiting member, wherein the inner tube rotation limiting member is installed on the lower end surface of the outer tube, a groove is provided on the inner surface of the inner tube rotation limiting member, and a rib matching the groove and sliding in the groove is provided on the outer surface of the inner tube. In the telescopic walking stick provided by the present invention, it may further have the following features: wherein, a second spring is provided at one end of the inner tube close to the inner tube rotation limiting member between the inner tube and the outer tube, one end of the second spring is connected to the inner tube rotation limiting member, and the other end is connected to the lower end surface of the nut for pressing against the nut to prevent it from disengaging from the lower end of the screw rod external thread. According to the telescopic walking stick of the present invention, since the motor drives the screw rod to rotate to realize the telescoping of the walking stick, it can not only assist the user to walk, but also provide external force assistance according to the needs of the user. In addition, the control switch is provided at the handle, which is convenient for the user to timely control the telescopic length of the walking stick according to their own situation and the current scenario. Moreover, since the screw rod external thread is only provided in the middle section of the screw rod, when the walking stick is telescoped to a certain stroke, the motor will rotate idly, which can prevent the motor from jamming and avoid the situation that the walking stick fails, bringing inconvenience or even danger to the user.

[0003] The above telescopic walking stick has the following defects in design: First, since the telescopic mechanism of the above telescopic walking stick uses components such as motors and lead screws, the weight of the walking stick will be relatively heavy, and using it for a long time will increase the fatigue of the user. Second, there is a durability problem: The telescopic mechanism uses components such as controllers and motors, with a large number of parts and a complex structure, which is prone to failure and has a short service life. Summary of the Invention

[0004] The purpose of the present invention is to provide a stable telescopic rod for a walking stick that is light in weight, long in service life, low in cost, and simple and fast in operation.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A stable telescopic rod for a walking stick includes an outer tube, a telescopic inner tube, a locking mechanism, a telescopic limiter, and a telescopic limiting rod. The telescopic limiting rod is provided with limiting protrusions distributed at intervals along the extending direction of the rod body. The end face of the telescopic limiter is provided with a through hole and an anti-rotation limiting groove. The telescopic limiting rod is located inside the outer tube and the lower end of the telescopic limiting rod is fixed on a fixing member at the lower end of the outer tube. The telescopic limiter is inserted on the telescopic limiting rod and fixed at the lower end of the telescopic inner tube. The lower end of the telescopic inner tube is inserted into the outer tube, and the upper end of the telescopic inner tube is located outside the outer tube. The locking mechanism is used to lock and fix the telescopic inner tube on the outer tube. When the telescopic inner tube is telescopically adjusted relative to the outer tube, the telescopic limiter slides along the telescopic limiting rod and the limiting protrusions on the telescopic limiting rod pass through the through hole of the telescopic limiter. When the telescopic inner tube extends out of the outer tube to a preset length, rotate the telescopic inner tube by a preset angle and press down the telescopic inner tube so that the limiting protrusions cannot pass through the through hole and are located in the anti-rotation limiting groove to limit the rotation of the telescopic inner tube, and use the locking mechanism to lock and fix the telescopic inner tube. With this design, it not only facilitates the length adjustment of the walking stick, but also improves the bearing capacity and stability of the support of the walking stick.

[0007] Furthermore, the end face of the telescopic limiter is provided with a rotation limiting post. When the telescopic inner tube rotates, the rotation limiting post rotates with the telescopic inner tube. When the rotation limiting post is blocked by the limiting protrusion, press down the telescopic inner tube so that the limiting protrusion enters the anti-rotation limiting groove.

[0008] Further, the limiting protrusions are arranged in two rows and are respectively distributed on the left and right sides of the telescopic limiting rod. The limiting protrusions in the two rows correspond to each other, forming a left-right symmetric structure on the telescopic limiting rod; the through holes on the telescopic limiter can simultaneously pass through two corresponding limiting protrusions on the left and right. There are two anti-rotation limiting grooves, and the two anti-rotation limiting grooves are located on both sides of the through hole. When the telescopic inner tube rotates a preset angle and presses down the telescopic inner tube, the two corresponding limiting protrusions on the left and right are respectively located in the two anti-rotation limiting grooves. Such a design not only further improves the bearing capacity of the telescopic inner tube, but also further improves the stability of the support.

[0009] Further, on the end face of the telescopic limiter, the center line of the through hole is perpendicular to the common center line of the two anti-rotation limiting grooves, and the preset rotation angle of the telescopic inner tube is 90°.

[0010] Further, a stop block is provided at the upper end of the telescopic limiting rod, and the stop block cannot pass through the through hole to prevent the telescopic inner tube from detaching from the outer tube.

[0011] Further, the fixing member includes a C-shaped sleeve and a cylindrical fixing seat. The cylindrical fixing seat is inserted into the C-shaped sleeve, and the cylindrical fixing seat is inserted into the lower end of the outer tube together with the C-shaped sleeve. A screw rod is provided at the lower end of the telescopic limiting rod. Upper nut joints and lower nut joints are respectively provided at the upper end and the lower end of the cylindrical fixing seat. The upper nut joint is used for threaded connection with the screw rod, and the lower nut joint is used for threaded connection with the crutch support foot.

[0012] Further, a limiting ring is provided on the end face of the C-shaped sleeve. When the C-shaped sleeve is inserted into the outer tube and the limiting ring is located outside the outer tube and presses against the lower end face of the outer tube, the first transverse through hole on the cylindrical fixing seat, the second transverse through hole on the C-shaped sleeve, and the third transverse through hole on the outer tube correspond to each other. The tubular nut passes through the third transverse through hole, the second transverse through hole, and the first transverse through hole and is threadedly connected with the nut.

[0013] Further, a protective tube and a locking nut are provided on the screw rod. The protective tube is inserted on the screw rod and is locked and fixed with the locking nut. The locking nut cannot pass through the through hole of the telescopic limiter.

[0014] Further, a notch is opened at the upper end of the outer tube, and the locking mechanism is located at the notch.

[0015] Further, the locking mechanism includes a hoop, a locking rod, a clamping block, a locking shaft, a cam, an arc-shaped wear-resistant pad, and a handle. The two ends of the hoop are provided with a left clamping part and a right clamping part. The left end of the locking rod is connected to the clamping block, and the right end of the locking rod sequentially passes through the left clamping part and the right clamping part and is fixedly connected to the locking shaft, and the locking shaft is perpendicular to the locking rod. The handle is arranged on the cam, and the cam is mounted on the locking shaft and can rotate relative to the locking shaft. The outer side surface of the right clamping part is an arc surface, the arc-shaped wear-resistant pad is closely attached to the arc surface, the cam contacts the arc-shaped wear-resistant pad, and by rotating the cam through the handle, the cam presses against the right clamping part through the arc-shaped wear-resistant pad, so that the left clamping part and the right clamping part approach each other, so as to lock the pipe orifice of the outer pipe to the telescopic inner pipe.

[0016] The beneficial effects of the present invention are as follows:

[0017] This application makes the telescopic limiter and the telescopic limiting rod cooperate to realize the adjustment of the extension length of the telescopic inner pipe. Its structure is simple, with few components, which not only reduces the overall weight and improves the user's comfort, but also is durable and extends the service life. And when the telescopic inner pipe extends out of the outer pipe to the preset length, the limiting protrusion is located in the anti-rotation limiting groove to limit the rotation of the telescopic inner pipe, which can improve the bearing capacity and the stability of the support of the crutch, and at the same time has the characteristics of simple operation and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the following drawings without creative efforts:

[0019] Figure 1 is an exploded view of the present invention;

[0020] Figure 2 is Figure 1 the longitudinal sectional view of the cylindrical fixing seat shown;

[0021] Figure 3 is Figure 1 the structural schematic diagram of the telescopic limiter shown;

[0022] Figure 4 is Figure 3 the three-dimensional view shown;

[0023] Figure 5 is Figure 1 the structural schematic diagram of the locking mechanism shown;

[0024] Figure 6 is Figure 1 the structural schematic diagram after assembly shown.

[0025] In the figure: 1. Outer tube; 2. Telescopic inner tube; 3. Locking mechanism; 4. Telescopic limiter; 5. Telescopic limit rod; 6. C-shaped sleeve; 7. Cylindrical fixed seat; 8. Screw; 9. Upper nut joint; 10. Lower nut joint; 11. Limit ring; 12. First transverse through hole; 13. Second transverse through hole; 14. Third transverse through hole; 15. Tubular nut; 16. Nut; 17. Protection tube; 18. Locking nut; 19. Notch; 20. Limit protrusion; 21. Stop block; 22. Through hole; 23. Anti-rotation limit groove; 24. Rotation limit post; 25. Center line of the through hole; 26. Common center line of the anti-rotation limit groove; 27. Hoop; 28. Locking rod; 29. Clamping block; 30. Locking shaft; 31. Cam; 32. Arc-shaped wear-resistant pad; 33. Handle; 34. Left clamping part; 35. Right clamping part; 36. Arc surface. Detailed implementation mode

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper surface", "lower surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward rotation", "reverse rotation", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0028] As Figure 1 、 2 shown in Figures 1, 3, 4, and 6, a stable crutch telescopic rod includes an outer tube 1, a telescopic inner tube 2, a locking mechanism 3, a telescopic limiter 4, and a telescopic limit rod 5. The telescopic limit rod 5 is located inside the outer tube 1, and the lower end of the telescopic limit rod 5 is fixed on the fixing member at the lower end of the outer tube 1. The fixing member includes a C-shaped sleeve 6 and a cylindrical fixed seat 7. The cylindrical fixed seat 7 is inserted into the C-shaped sleeve 6, and the cylindrical fixed seat 7 is inserted into the lower end of the outer tube 1 together with the C-shaped sleeve 6. A screw 8 is provided at the lower end of the telescopic limit rod 5. An upper nut joint 9 and a lower nut joint 10 are respectively provided at the upper end and the lower end of the cylindrical fixed seat 7. The upper nut joint 9 is used for threaded connection with the screw 8, and the lower nut joint 10 is used for threaded connection with the crutch support foot.

[0029] A limiting ring 11 is provided on the end face of the C-shaped sleeve 6. When the C-shaped sleeve 6 is inserted into the outer tube 1 and the limiting ring 11 is located outside the outer tube 1 and presses against the lower end face of the outer tube 1, the first transverse through hole 12 on the cylindrical fixing seat 7, the second transverse through hole 13 on the C-shaped sleeve 6, and the third transverse through hole 14 on the outer tube 1 correspond to each other. The tubular nut 15 passes through the third transverse through hole 14, the second transverse through hole 13, and the first transverse through hole 12 and is threadedly connected to the nut 16.

[0030] A protective tube 17 and a locking nut 18 are provided on the screw rod 8. The protective tube 17 is inserted on the screw rod 8 and locked and fixed with the locking nut 18. The locking nut 18 cannot pass through the through hole 22 of the telescopic limiter 4. A notch 19 is formed at the upper end of the outer tube 1, and the locking mechanism 3 is located at the notch 19.

[0031] Limit protrusions 20 are distributed at intervals along the extending direction of the rod body on the telescopic limiting rod 5. A stop block 21 is provided at the upper end of the telescopic limiting rod 5. The stop block 21 cannot pass through the through hole 22 to prevent the telescopic inner tube 2 from separating from the outer tube 1.

[0032] A through hole 22 and an anti-rotation limiting groove 23 are provided on the end face of the telescopic limiter 4. The telescopic limiter 4 is inserted on the telescopic limiting rod 5 and fixed at the lower end of the telescopic inner tube 2. The lower end of the telescopic inner tube 2 is inserted into the outer tube 1, and the upper end of the telescopic inner tube 2 is located outside the outer tube 1. The locking mechanism 3 is used to lock and fix the telescopic inner tube 2 on the outer tube 1. When the telescopic inner tube 2 is telescopically adjusted relative to the outer tube 1, the telescopic limiter 4 slides along the telescopic limiting rod 5 and the limit protrusions 20 on the telescopic limiting rod 5 pass through the through hole 22 of the telescopic limiter. When the telescopic inner tube 2 extends out of the outer tube 1 to a preset length, the telescopic inner tube 2 is rotated by a preset angle and the telescopic inner tube 2 is pressed down so that the limit protrusions 20 cannot pass through the through hole 22 and are located in the anti-rotation limiting groove 23 to limit the rotation of the telescopic inner tube 2, and the telescopic inner tube 2 is locked and fixed with the locking mechanism 3. Such a design not only facilitates the length adjustment of the cane but also improves the bearing capacity and the stability of the support of the cane.

[0033] A rotation limiting post 24 is provided on the end face of the telescopic limiter 4. When the telescopic inner tube 2 rotates, the rotation limiting post 24 rotates with the telescopic inner tube 2. When the rotation limiting post 24 is blocked by the limit protrusions 20 on the telescopic limiting rod 5, the telescopic inner tube 2 is pressed down so that the limit protrusions 20 enter the anti-rotation limiting groove 23.

[0034] In order to further improve the bearing capacity of the telescopic inner tube and the stability of the support, the limit protrusions 20 are arranged in two rows and are respectively distributed on the left and right sides of the telescopic limit rod 5. The limit protrusions 20 in the two rows correspond to each other, forming a left-right symmetric structure on the telescopic limit rod 5; the through holes 22 on the telescopic limiter 4 can simultaneously pass through two corresponding limit protrusions 20 on the left and right. There are two anti-rotation limit grooves 23, and the two anti-rotation limit grooves 23 are located on both sides of the through hole 22. When the telescopic inner tube 2 rotates a preset angle and is pressed down, the two corresponding limit protrusions on the left and right are respectively located in the two anti-rotation limit grooves 23.

[0035] In this embodiment, on the end face of the telescopic limiter, the center line 25 of the through hole is perpendicular to the common center line 26 of the two anti-rotation limit grooves, and the preset rotation angle of the telescopic inner tube 2 is 90°.

[0036] As Figure 5 shown, the locking mechanism 3 includes a hoop 27, a locking rod 28, a clamping block 29, a locking shaft 30, a cam 31, an arc-shaped wear-resistant pad 32 and a handle 33. The two ends of the hoop 27 are provided with a left clamping part 34 and a right clamping part 35. The left end of the locking rod 28 is connected to the clamping block 29. The right end of the locking rod 28 sequentially passes through the left clamping part 34 and the right clamping part 35 and is fixedly connected to the locking shaft 30, and the locking shaft 30 is perpendicular to the locking rod 28. The handle 33 is arranged on the cam 31. The cam 31 is installed on the locking shaft 30 and can rotate relative to the locking shaft 30; the outer side surface of the right clamping part 35 is an arc surface 36, and the arc-shaped wear-resistant pad 32 is closely attached to the arc surface 36. The cam 31 contacts the arc-shaped wear-resistant pad 32. By rotating the cam 31 through the handle 33, the cam 31 presses against the right clamping part 35 through the arc-shaped wear-resistant pad 32, so that the left clamping part 34 and the right clamping part 35 approach each other, so as to lock the telescopic inner tube 2 at the pipe orifice of the outer tube 1.

[0037] The technical features of the stable walking stick telescopic rod of the present invention are as follows: First, the telescopic limiter and the telescopic limit rod are matched to realize the adjustment of the extended length of the telescopic inner tube. Its structure is simple and the number of components is small, which not only reduces the overall weight and improves the user's comfort; second, the improvement of the locking mechanism makes the locking operation more convenient and fast; third, when the telescopic inner tube extends out of the outer tube to the preset length, the limit protrusions are located in the anti-rotation limit grooves to limit the rotation of the telescopic inner tube, which can improve the bearing capacity and the stability of the support of the walking stick; fourth, it is a pure mechanical component, does not involve electrical components, is durable, has a long service life, and has a low cost, which helps to promote its application in the market.

[0038] In addition, without contradiction, those skilled in the art may combine and combine different embodiments or examples described in this specification, as well as the features of different embodiments or examples. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A stable telescopic rod of a crutch, characterized in that: The telescopic limiter comprises an outer tube, a telescopic inner tube, a locking mechanism, a telescopic limiter and a telescopic limiter rod, wherein the telescopic limiter rod is provided with limit protrusions spaced along the extension direction of the rod body, a through hole and an anti-rotation limiter groove are arranged on the end surface of the telescopic limiter, the telescopic limiter rod is located in the outer tube and the lower end of the telescopic limiter rod is fixed to the fixing piece at the lower end of the outer tube, the telescopic limiter is inserted on the telescopic limiter rod and fixed to the lower end of the telescopic inner tube, the lower end of the telescopic inner tube is inserted in the outer tube, and the upper end of the telescopic inner tube is located at the outer tube. The locking mechanism is used to lock and fix the telescopic inner tube on the outer tube. When the telescopic inner tube is telescopically adjusted relative to the outer tube, the telescopic limiter slides along the telescopic limit rod and the limiting protrusion on the telescopic limit rod passes through the through hole of the telescopic limiter. When the telescopic inner tube extends out of the outer tube to a preset length, the telescopic inner tube is rotated by a preset angle and the telescopic inner tube is pressed down, so that the limiting protrusion cannot pass through the through hole and is located in the anti-rotation limiting groove, so as to limit the rotation of the telescopic inner tube, and the telescopic inner tube is locked and fixed by the locking mechanism.

2. The stable crutch telescopic rod according to claim 1, characterized in that: A rotation limiting column is provided on the end surface of the telescopic limiter. When the telescopic inner tube rotates, the rotation limiting column rotates with the telescopic inner tube. When the rotation limiting column is blocked by the limiting protrusion, the telescopic inner tube is pressed down to make the limiting protrusion enter the anti-rotation limiting groove.

3. The stable crutch telescopic rod according to claim 2, characterized in that: The limiting protrusions are arranged in two rows and are respectively distributed on the left and right sides of the telescopic limiting rod. The limiting protrusions in the two rows correspond to each other, forming a left-right symmetrical structure on the telescopic limiting rod; the through hole on the telescopic limiter can pass through the two corresponding limiting protrusions on the left and right at the same time, and the anti-rotation limiting grooves are provided with two, and the two anti-rotation limiting grooves are located on both sides of the through hole. When the telescopic inner tube rotates a preset angle and presses down the telescopic inner tube, the two corresponding limiting protrusions on the left and right are respectively located in the two anti-rotation limiting grooves.

4. The stable crutch telescopic rod according to claim 3, characterized in that: On the end surface of the telescopic limiter, the center line of the through hole is perpendicular to the common center line of the two anti-rotation limit grooves, and the preset rotation angle of the telescopic inner tube is 90°.

5. The stable crutch telescopic rod according to claim 1, characterized in that: A stopper is provided at the upper end of the telescopic limit rod, and the stopper cannot pass through the through hole, so as to prevent the telescopic inner tube from being separated from the outer tube.

6. The stable crutch telescopic rod according to claim 1, characterized in that: The fixing part includes a C-shaped sleeve and a cylindrical fixing seat, the cylindrical fixing seat is inserted in the C-shaped sleeve, and the cylindrical fixing seat is inserted into the lower end of the outer tube together with the C-shaped sleeve. The lower end of the telescopic limit rod is provided with a screw rod, and the upper end and lower end of the cylindrical fixing seat are respectively provided with an upper nut joint and a lower nut joint, the upper nut joint is used to be threadedly connected to the screw rod, and the lower nut joint is used to be threadedly connected to the crutch support foot.

7. The stable crutch telescopic rod according to claim 6, characterized in that: A limiting ring is provided on the end surface of the C-shaped sleeve. When the C-shaped sleeve is inserted into the outer tube and the limiting ring is located outside the outer tube and pressed against the lower end surface of the outer tube, the first transverse through hole on the cylindrical fixing seat, the second transverse through hole on the C-shaped sleeve and the third transverse through hole on the outer tube correspond to each other, and the tubular nut passes through the third transverse through hole, the second transverse through hole and the first transverse through hole and is threadedly connected with the nut.

8. The stable crutch telescopic rod according to claim 6, characterized in that: The screw rod is provided with a protection tube and a locking nut. The protection tube is inserted into the screw rod and is locked and fixed by the locking nut. The locking nut cannot pass through the through hole of the telescopic limiter.

9. The stable crutch telescopic rod according to claim 1, characterized in that: A notch is formed at the upper end of the outer tube, and the locking mechanism is located at the notch.

10. The stable crutch telescopic rod according to claim 9, characterized in that: The locking mechanism includes a clamp, a locking rod, a clamping block, a locking shaft, a cam, an arc-shaped friction-resistant pad and a handle, and a left clamping part and a right clamping part are provided at both ends of the clamp, the left end of the locking rod is connected to the clamping block, and the right end of the locking rod passes through the left clamping part and the right clamping part in sequence and is fixedly connected to the locking shaft, and the locking shaft is perpendicular to the locking rod, and the handle is arranged on the cam, and the cam is installed on the locking shaft and can rotate relative to the locking shaft; the outer side surface of the right clamping part is an arc surface, and the arc-shaped friction-resistant pad is tightly attached to the arc surface, and the cam is in contact with the arc-shaped friction-resistant pad, and the cam is rotated by the handle so that the cam presses the right clamping part through the arc-shaped friction-resistant pad, so that the left clamping part and the right clamping part are close to each other, so that the pipe mouth of the outer tube locks the telescopic inner tube.

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