Telescopic device

Abstract

The utility model relates to telescopic equipment. The telescopic device comprises an inner pipe extending in the axial direction. The outer pipe is movably arranged on the outer side of the inner pipe in a sleeving manner; the clamping sleeve is arranged on the outer side of the inner pipe and comprises a sleeve ring and an abutting part extending from the sleeve ring to the fixing part. The fixing sleeve comprises a fixing part connected to the outer pipe and a locking part at least partially arranged on the periphery of the abutting part in a sleeving mode, and external threads are arranged on the outer wall of the locking part. The locking sleeve comprises a locking part located on the outer side of the fixing part, and an inner thread matched with the outer thread is arranged on the inner wall of the locking part; the clamping sleeve comprises a clamping jaw extending away from the abutting portion from the lantern ring and a clamping groove located between the clamping jaw and the lantern ring, the locking sleeve comprises a clamping portion extending in the radial direction from the inner wall of the locking sleeve, and the clamping portion is clamped into the clamping groove. The operation efficiency of the telescopic equipment can be improved, and the stability of the telescopic equipment is guaranteed.

Description

Technical Field

[0001] This application relates to the field of garden tool technology, and more particularly to a telescopic device. Background Technology

[0002] With the rapid development of technology, telescopic devices are widely used in various garden tools, such as long-handled pruning shears or pole saws. However, in related technologies, the telescopic function of the device is often achieved by connecting tubular elements of different diameters, but the device lacks radial limiting function, reducing its efficiency. In other related technologies, the radial limiting function of the telescopic device is achieved through a semi-annular locking sleeve, but the split structure reduces the structural strength of the telescopic device, affecting its safety and stability during operation. Utility Model Content

[0003] In view of the above, it is necessary to provide a telescopic device that can quickly adjust the length of the telescopic device, thereby improving its safety and stability.

[0004] In a first aspect, this application provides a telescopic device, comprising: an inner tube extending axially; an outer tube movably sleeved on the outside of the inner tube; a clamping sleeve disposed on the outside of the inner tube, the clamping sleeve including a collar and an abutting portion extending from the collar toward a fixed portion; a fixed sleeve including a fixed portion connected to the outer tube and a locking portion at least partially sleeved on the outer periphery of the abutting portion, the outer wall of the locking portion being provided with external threads; and a locking sleeve including a locking portion located outside the fixed portion, the inner wall of the locking portion being provided with internal threads matching the external threads. The clamping sleeve includes a jaw extending from the collar away from the abutting portion and an engaging groove located between the jaw and the collar, and the locking sleeve includes an engaging portion extending radially from its inner wall, the engaging portion engaging into the engaging groove.

[0005] In one possible design, the length of the engaging portion is less than the length of the engaging groove in the axial direction.

[0006] In one possible design, the outer diameter formed by several claws is larger than the inner diameter formed by the engaging portion within the locking sleeve.

[0007] In one possible design, the telescopic device also includes a bushing connected to the inner tube; the inner wall of the fixed part forms an annular blocking surface, the end of the outer tube abuts against the annular blocking surface, and when the length of the telescopic device reaches its maximum, the end of the bushing abuts against the annular blocking surface.

[0008] In one possible design, a limiting protrusion is provided inside the bushing, and an inner tube limiting hole is opened at the end of the inner tube near the outer tube, with the limiting protrusion being received in the inner tube limiting hole.

[0009] In one possible design, the abutment portion includes several wedge-shaped pieces that are circumferentially arranged to fit the outer side of the inner tube, with the thickness of each wedge decreasing towards the outer tube.

[0010] In one possible design, the inner wall of the locking part forms a conical surface, and a receiving space is formed between the conical surface and the inner tube. The inner diameter of the receiving space decreases in the direction closer to the outer tube.

[0011] In one possible design, the outer side of the inner tube is recessed inward with an inner tube limiting groove, and the inner wall of the fixing sleeve is provided with a first limiting boss, which engages with the inner tube limiting groove.

[0012] In one possible design, the outer tube has an outer tube limiting groove, which is located at one end of the outer tube near the fixed sleeve. A second limiting boss is provided on the annular blocking surface, and the second limiting boss engages with the outer tube limiting groove.

[0013] In one possible design, the fixing part includes a first locking part and a second locking part extending from its outer peripheral wall at intervals, forming a locking gap between the first locking part and the second locking part; the first locking part is provided with a first locking hole, and the second locking part is provided with a second locking hole, the first locking hole and the second locking hole corresponding to each other; an outer tube limiting hole is opened at one end of the outer tube near the fixing part. The telescopic device also includes a limiting plate, a first locking member and a second locking member; the limiting plate is provided with an insertion hole, and one end of the limiting plate forms an insertion part; the limiting plate is disposed in the locking gap, the insertion part passes through the outer tube limiting hole, and the first locking member is used to connect with the second locking member after passing through the first locking hole, the insertion hole and the second locking hole in sequence.

[0014] The technical solution of this application has at least the following technical effects or advantages:

[0015] The telescopic device provided in this application includes a clamping sleeve, a fixing sleeve, and a locking sleeve. The fixing sleeve connects the inner and outer tubes. An external thread is provided on the outer wall of the locking portion of the fixing sleeve. The clamping sleeve includes a collar and an abutment portion extending from the collar towards the fixing portion. The clamping sleeve also includes a pawl extending from the collar away from the abutment portion and an engagement groove located between the pawl and the collar. The engagement portion on the locking sleeve engages with the engagement groove. An internal thread matching the external thread is provided on the inner wall of the locking portion of the locking sleeve. The telescopic adjustment function of the telescopic device is achieved through the mutual cooperation of the internal and external threads. Thus, this application allows for the telescopic adjustment of the inner tube simply by loosening the internal and external threads, improving the convenience and efficiency of operating the telescopic device. Furthermore, by tightening the internal and external threads, the clamping sleeve fixes the inner tube, achieving a radial limiting function for the telescopic device, which improves the structural stability of the telescopic device and effectively ensures its safety and stability during use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the composition of a telescopic device provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of a telescopic device provided in an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of a clamping sleeve provided in one embodiment of this application.

[0020] Figure 4 for Figure 2 A magnified view showing the details at point A in the middle.

[0021] Figure 5 This is a schematic diagram of a fixing sleeve provided in an embodiment of this application.

[0022] Figure 6 This is a schematic diagram of the internal structure of a clamping sleeve provided in an embodiment of this application.

[0023] Figure 7 This is a schematic diagram of a bushing provided in an embodiment of this application.

[0024] Figure 8 This is a schematic diagram of a limiting piece provided in an embodiment of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0026] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can indicate: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0027] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0028] With the rapid development of technology, telescopic devices are widely used in various garden tools, such as long-handled pruning shears or pole saws. However, in related technologies, the telescopic function of the device is often achieved by connecting tubular elements of different diameters, but the device lacks radial limiting function, reducing its efficiency. In other related technologies, the radial limiting function of the telescopic device is achieved through a semi-annular locking sleeve, but the split structure reduces the structural strength of the telescopic device, affecting its safety and stability during operation.

[0029] Based on this, this application provides a telescopic device that can quickly adjust the length of the telescopic device, thereby improving the safety and stability of the telescopic device.

[0030] Next, a telescopic device provided in the embodiments of this application will be further described. It is understood that the telescopic device provided in this application can be a long-handled garden tool, such as pruning shears, etc. In the following embodiments, a pruning shear with a telescopic rod is used as an example for illustration.

[0031] Please see Figure 1 This illustration shows a schematic diagram of the composition of a telescopic device according to an embodiment of this application. Figure 1 As shown, the telescopic device 1 includes: an inner tube 20, an outer tube 30, a clamping sleeve 101, a fixing sleeve 102, and a locking sleeve 103. The inner tube 20 extends axially, with the axial direction being the direction of its telescopic movement. The outer tube 30 is movably sleeved on the outside of the inner tube 20. The clamping sleeve 101, fixing sleeve 102, locking sleeve 103, inner tube 20, and outer tube 30 can be made of stainless steel, alloy, or other materials. This application does not limit the specific materials of each component of the telescopic device 1.

[0032] For example, such as Figure 2 As shown, a clamping sleeve 101 is disposed on the outside of the inner tube 20 for fixing the inner tube 20. The clamping sleeve 101 includes a collar 1011 and an abutting portion 1013 extending from the collar 1011 toward the fixing portion 102a. A fixing sleeve 102 is used to connect with the inner tube 20 and the outer tube 30. The fixing sleeve 102 includes a fixing portion 102a connected to the outer tube 30 and a locking portion 102b at least partially sleeved on the outer periphery of the abutting portion 1013. The end of the inner tube 20 near the outer tube 30 is received inside the outer tube 30, and the inner tube 20 can extend and retract within the outer tube 30. The end of the locking sleeve 103 away from the outer tube 30 is connected to the clamping sleeve 101, and the end of the locking sleeve 103 near the outer tube 30 is connected to the fixing sleeve 102. Understandably, the clamping sleeve 101, the fixing sleeve 102, and the locking sleeve 103 are all integral ring structures, which can effectively ensure the structural stability of the telescopic device 1 and reduce the probability of structural damage to the telescopic device 1 during use.

[0033] In one embodiment of this application, such as Figure 3As shown, the clamping sleeve 101 includes a claw 1012 extending from the collar 1011 away from the abutment portion 1013 and an engagement groove 1014 located between the claw 1012 and the collar 1011. The collar 1011 has an annular structure and is fitted onto the outer wall of the inner tube 20. The difference between the inner radius of the collar 1011 and the inner diameter of the inner tube 20 is a preset value; this application does not limit the specific size of the preset value. The abutment portion 1013 includes a plurality of wedge-shaped pieces 1013b, which are circumferentially disposed against the outer side of the inner tube 20. The thickness of each wedge-shaped piece 1013b decreases towards the outer tube. The wedge-shaped pieces 1013b are spaced apart to form a wedge groove 1013a between every two adjacent wedge-shaped pieces 1013b. Thus, the spaced-apart wedge-shaped pieces 1013b can be used for inner tubes 20 of different diameters. In one embodiment of this application, a plurality of wedge-shaped pieces 1013b can be obtained by dividing a conical surface, wherein the outer diameter of the conical surface decreases in the direction approaching the outer tube 30, that is, the bottom surface of the conical surface is close to the collar 1011. The conical surface is divided into a plurality of wedge-shaped pieces 1013b by wedge-shaped grooves 1013a. For example, if eight wedge-shaped grooves 1013a are provided on the conical surface, the conical surface can be divided into eight wedge-shaped pieces 1013b. By dividing the conical surface into wedge-shaped pieces 1013b, the inner tube 20 can pass through the clamping sleeve 101, thereby allowing the wedge-shaped pieces 1013b to conform to the outer wall of the inner tube 20.

[0034] In one embodiment of this application, the clamping claw 1012 includes a cantilever 1012a and a snap-fit ​​connector 1012b. One end of the cantilever 1012a is connected to the collar 1011, and the other end of the cantilever 1012a extends a distance away from the inner tube 20 to form the snap-fit ​​connector 1012b. Thus, an engagement groove 1014 is formed between the collar 1011, the cantilever 1012a, and the snap-fit ​​connector 1012b. Specifically, when the clamping sleeve 101 is fitted onto the inner tube 20, the end of the collar 1011 away from the outer tube 30 is provided with a plurality of clamping claws 1012, for example, the number of clamping claws 1012 is 4, and the end of the collar 1011 near the outer tube 30 is provided with a plurality of wedge-shaped pieces 1013b, for example, the number of wedge-shaped pieces 1013b can be 8.

[0035] Please refer to the following: Figure 2 and Figure 4The locking sleeve 103 includes an engaging portion 1032 extending radially from its inner wall and a locking portion 1033 located outside the fixing portion 102a. The engaging portion 1032 is generally annular and engages within the engaging groove 1014. Understandably, the engaging portion 1032 is received within the engaging groove 1014 and abuts against the cantilever 1012a. In the axial direction, the length L1 of the engaging portion 1032 is less than the length L2 of the engaging groove 1014 to achieve quick connection between the clamping sleeve 101 and the locking sleeve 103. Here, the axial direction refers to the direction of movement of the inner tube 20. For example, the difference between the length L1 of the engaging portion 1032 and the length L2 of the engaging groove 1014 is within a preset range of 0.2mm-0.5mm. This application does not limit the specific value of the preset range. This facilitates the quick installation and disassembly of the engaging part 1032 and the engaging groove 1014, reducing the probability of assembly failure due to manufacturing precision errors, thus lowering maintenance difficulty and improving the adaptability of the engaging part 1032 and the engaging groove 1014 in various environments. Furthermore, by setting a preset range, the user can effectively ensure that the user can quickly lock / unlock the inner tube 20 when using the telescopic device 1, reducing the time spent on rotation / screwing operations and improving the efficiency of using the telescopic device 1.

[0036] Furthermore, the outer diameter of the several claws 1012 is larger than the inner diameter of the engaging portion 1032 within the locking sleeve 103, and the inner diameter of the engaging portion 1032 within the locking sleeve 103 is smaller than the outer diameter of the collar 1011. Understandably, the difference H1 between the inner diameter of the engaging portion 1032 within the locking sleeve 103 and the outer diameter of the inner tube 20 is smaller than the difference H2 between the outer diameter of the collar 1011 and the outer diameter of the inner tube 20. The cantilever 1012a fits against the side wall of the inner tube 20, that is, the end of the cantilever 1012a closest to the inner tube 20 is connected to the inner circle of the collar 1011, and the engaging groove 1014 is provided on the side of the cantilever 1012a away from the inner tube 20. Thus, when the engaging part 1032 is inserted into the engaging groove 1014, the clamping sleeve 101 is connected to the locking sleeve 103, and the locking sleeve 103 can rotate relative to the clamping sleeve 101. Since the inner diameter formed by the engaging part 1032 in the locking sleeve 103 is smaller than the outer diameter formed by several claws 1012, the claws 1012 deform when passing through the hole formed by the engaging part 1032, and the deformation recovers after passing through, thereby strengthening the connection between the clamping sleeve 101 and the locking sleeve 103. When the locking sleeve 103 moves in the direction close to the outer tube 30, the engaging part 1032 applies pressure to the collar 1011 so that the clamping sleeve 101 moves synchronously with the locking sleeve 103 in the direction close to the outer tube 30; when the locking sleeve 103 moves in the direction away from the outer tube 30, the engaging part 1032 applies pressure to the snap-fit ​​connector 1012b so that the clamping sleeve 101 moves synchronously with the locking sleeve 103 in the direction away from the outer tube 30.

[0037] In one embodiment of this application, such as Figure 5 As shown, the inner wall of the locking part 102b forms a conical surface 1021. (As indicated...) Figure 6 As shown, the inner wall of the fixing part 102a forms an annular blocking surface 1024. A first limiting protrusion 1023 is provided on the inner wall of the fixing sleeve 102, that is, a first limiting protrusion 1023 is provided at the end of the annular blocking surface 1024 away from the outer tube 30. A second limiting protrusion 1025 is provided at the end of the annular blocking surface 1024 near the outer tube 30. The number of second limiting protrusions 1025 can be, for example, two; this application does not limit the specific number of second limiting protrusions 1025. A receiving space 1029 is formed between the conical surface 1021 and the inner tube 20, and the inner diameter of the receiving space 1029 decreases along the direction near the outer tube 30. Understandably, the inner wall of the conical surface 1021 abuts against the outer wall of the wedge-shaped piece 1013b, and the inner wall of the conical surface 1021 is adapted to the outer wall of the wedge-shaped piece 1013b. When the inner tube 20 is inserted into the fixing sleeve 102, the wedge 1013b can be inserted into the receiving space 1029 between the conical surface 1021 and the inner tube 20, and the wedge 1013b can fit against the inner wall of the conical surface 1021.

[0038] The outer wall of the locking part 102b is provided with an external thread 1022, and the inner wall of the locking part 1033 is provided with an internal thread 1031 that matches the external thread 1022. When the internal thread 1031 engages with the external thread 1022, the telescopic device 1 is in a locked state. At this time, the locking sleeve 103 drives the clamping sleeve 101 to move in the direction close to the outer tube 30 through the engagement groove 1014 and the engagement part 1032. The abutting part 1013 abuts against the inner wall of the locking part 102b and the outer wall of the inner tube 20, and the pressure applied by the locking part 102b to the abutting part 1013 is greater than or equal to a preset pressure threshold, so that the abutting part 1013 clamps the inner tube, thereby stopping the inner tube 20 from sliding. The inner tube 20 is fixed by the movement of the inner thread 1031 and the outer thread 1022. When the inner thread 1031 and the outer thread 1022 are loosened, the telescopic device 1 is unlocked and is in a telescopic state. At this time, the locking sleeve 103 drives the clamping sleeve 101 to move away from the outer tube 30 through the cooperation of the locking groove 1014 and the locking part 1032. The pressure applied by the locking part 102b to the abutment part 1013 is less than the preset pressure threshold, so that there is an active gap between the abutment part 1013 and the outer wall of the inner tube 20, so that the inner tube 20 can slide relative to the outer tube 30. Understandably, when the internal thread 1031 and the external thread 1022 are engaged, the locking sleeve 103 moves in the direction close to the outer tube 30. During the movement, the wedge 1013b is used to be received in the receiving space 1029 when the internal thread 1031 and the external thread 1022 are engaged, and the wedge 1013a gradually comes into contact with the conical surface 1021. The engaging part 1032 pushes the collar 1011 so that the clamping sleeve 101 moves synchronously towards the fixed sleeve 102 until the contact area between the wedge 1013a and the inner wall of the conical surface 1021 reaches its maximum. At this time, the conical surface 1021 applies pressure to the wedge 1013a and the wedge 1013a applies pressure to the inner tube, thereby fixing the inner tube 20 and the outer tube 30 relatively, and the inner tube 20 cannot be extended or retracted to adjust its length. When the internal thread 1031 and external thread 1022 are loosened, the locking sleeve 103 moves away from the outer tube 30. During this movement, the wedge 1013a gradually disengages from the conical surface 1021. The engaging part 1032 pushes the snap-fit ​​connector 1012b, causing the clamping sleeve 101 to move away from the fixing sleeve 102 simultaneously. At this time, the inner tube 20 is not under the pressure of the clamping sleeve 101, so the inner tube 20 can adjust its length by extending or retracting in the direction closer to or further away from the outer tube 30. When the inner tube 20 is adjusted to the appropriate length, the internal thread 1031 and external thread 1022 are tightened again to achieve relative fixation between the inner tube 20 and the outer tube 30.

[0039] Please refer to it again. Figure 1 ,like Figure 1As shown, the inner tube 20 has an inwardly recessed inner tube limiting groove 201 on its outer side, which is axially located at the end of the inner tube 20 near the outer tube 30. The outer tube 30 also has an outer tube limiting groove 301 located at the end of the outer tube 30 near the fixing sleeve 102. Please refer to [link / reference]. Figure 6 The first limiting boss 1023 engages with the inner tube limiting groove 201. When the closed end of the inner tube limiting groove 201 abuts against the first limiting boss 1023, the inner tube 20 can no longer extend into the outer tube 30. Please refer to the following: Figure 2 and Figure 6 One end of the outer tube 30 abuts against the annular blocking surface 1024. The second limiting boss 1025 engages with the outer tube limiting groove 301. Understandably, by embedding the first limiting boss 1023 into the inner tube limiting groove 201, the relative position of the inner tube 20 and the fixed sleeve 102 can be effectively ensured, reducing the probability of the inner tube 20 rotating inside the fixed sleeve 102, improving the stability of the telescopic device structure, and effectively limiting the position of the outer tube 30, reducing the probability of the outer tube 30 passing through the fixed sleeve 102. Thus, the second limiting boss 1025 and the outer tube limiting groove 301 effectively ensure the relative position of the fixed sleeve 102 and the outer tube 30, reducing the probability of the outer tube 30 rotating in the fixed sleeve 102, reducing the probability of parts disintegrating during use of the telescopic device 1, and ensuring the structural stability of the telescopic device 1.

[0040] Please refer to the following: Figure 2 and Figure 7 The telescopic device 1 also includes a bushing 104, which is connected to the inner tube 20 and is disposed inside the outer tube 30. The end of the outer tube 30 abuts against the annular blocking surface 1024. When the length of the telescopic device 1 reaches its maximum, i.e., the inner tube 20 extends to its maximum length in the direction away from the outer tube 30, the end of the bushing 104 abuts against the annular blocking surface 1024 to limit the inner tube 20. This application does not limit the maximum length to which the inner tube 20 extends in the direction away from the outer tube 30. The bushing 104 has a bushing groove 1041, which is axially formed at one end of the bushing 104 near the inner tube 20, so that the bushing 104 is connected to the inner tube 20. The inner tube 20 is inserted into the bushing 40 from the end of the bushing 104 away from the outer tube 30. The number of bushing grooves 1041 can be, for example, two, and this application does not limit the specific number of bushing grooves 1041. A bushing groove 1041 can also be provided at the end of the bushing 104 near the outer tube 30 to correspond to the outer tube limiting groove 301, thereby enabling the bushing 104 to be inserted into the outer tube 30. Since there is an error in the outer diameter of the inner tube 20, the bushing groove 1041 can effectively adjust the connection tightness between the bushing 104 and the inner tube 20, reduce the gap between the outer wall of the inner tube 20 and the inner wall of the bushing 104, and at the same time, the bushing groove 1041 helps to improve the efficiency of bushing 104 installation and / or disassembly.

[0041] A limiting protrusion 1042 is provided inside the bushing 1041. An inner tube limiting hole 202 is provided at the end of the inner tube 20 near the outer tube 30. The limiting protrusion 1042 is received within the inner tube limiting hole 202, allowing the bushing 104 to connect with the inner tube 20. Understandably, the limiting protrusion 1042 is located inside the bushing 104 near the inner tube 20, and corresponds to the inner tube limiting hole 202. This application does not limit the number of limiting protrusions 1042 and inner tube limiting holes 202. The bushing 104 is connected to the inner tube 20 via the limiting protrusion 1042, enabling the bushing 104 to move synchronously along the axial direction with the inner tube 20. This reduces the probability of disintegration during use of the telescopic device 1 and improves the robustness and safety of the telescopic device 1. When the bushing 1041 moves away from the outer tube 30 along with the inner tube 20, if the end of the bushing 1041 away from the outer tube 30 (i.e. the end of the bushing 1041) abuts against the annular blocking surface 1024, it means that the inner tube 20 has extended to its maximum length in the direction away from the outer tube 30, that is, the inner tube 20 can no longer extend beyond the outer tube 30, thereby limiting the extension and retraction length of the inner tube 20.

[0042] Please refer to it again. Figure 1 and Figure 5 ,like Figure 5 As shown, the fixing part 102a also includes a first locking part 1026 and a second locking part 1027 extending from its outer peripheral wall at intervals. The first locking part 1026 and the second locking part 1027 are parallel to each other. The first locking part 1026 is provided with a first locking hole 1026a, and the second locking part 1027 is provided with a second locking hole 1027a. The first locking part 1026 and the second locking part 1027 can be ear-shaped structures or other shapes; this application does not limit the specific shapes of the first locking part 1026 and the second locking part 1027. The first locking hole 1026a and the second locking hole 1027a correspond to each other. A locking gap 1028 is formed between the first locking part 1026 and the second locking part 1027, and the locking gap 1028 communicates with the interior of the fixing sleeve 102.

[0043] like Figure 1 As shown, the telescopic device 1 also includes a limiting piece 105, a first locking member 1061, and a second locking member 1062. The limiting piece 105 is disposed in the locking gap 1028. The radial thickness of the limiting piece 105 is less than the thickness of the locking gap 1028, and the radial direction is perpendicular to the axial direction. Figure 8As shown, the limiting piece 105 has an insertion hole 1051, which corresponds to the positions of the first locking hole 1026a and the second locking hole 1027a. When the limiting piece 105 is inserted into the locking gap 1028, the first locking member 1061 is inserted from the end of the first locking part 1026 or the second locking part 1027 away from the locking gap 1028. The first locking member 1061 is used to pass through the first locking hole 1026a, the insertion hole 1051, and the second locking hole 1027a in sequence and then connect with the second locking member 1062. Figure 1 As shown, the first locking member 1061 can be a bolt, and the second locking member 1062 can be a nut. When the limiting piece 105 is worn, it can be replaced by loosening the first locking member 1061 and the second locking member 1062. The first locking member 1061 and the second locking member 1062 can also be other structures capable of fixing the limiting piece 105. This application does not limit the specific implementation of the first locking member 1061 and the second locking member 1062. Figure 8 As shown, an insertion portion 1052 is formed at one end of the limiting piece 105. The insertion portion 1052 is disposed at the end of the limiting piece 105 near the fixing sleeve 102. The insertion portion 1052 can be cylindrical or other shapes. This application does not limit the specific shape and style of the insertion portion 1052. The insertion portion 1052 can pass through the bushing groove 1041 to avoid the insertion portion 1052, or it can avoid the insertion portion 1052 in other ways. This application does not limit the specific way of avoiding the insertion portion 1052. An outer tube limiting hole 302 is provided at the end of the outer tube 30 near the fixing portion 102a. The insertion part 1052 is inserted into the outer tube limiting hole 302. The outer tube limiting hole 302 is located at the corresponding position of the insertion part 1052. That is, when the outer tube 30 is inserted into the fixed sleeve 102 along the axial direction, the insertion part 1052 passes through the outer tube limiting hole 302. Therefore, after the limiting piece 105 is inserted into the locking gap 1028, the insertion part 1052 is connected to the inside of the fixed sleeve 102 through the locking gap 1028 and is inserted into the inside of the outer tube 30 through the outer tube limiting hole 302, thereby realizing the fixed connection between the fixed sleeve 102 and the outer tube 30. This can effectively ensure the firmness of the connection structure between the fixed sleeve 102 and the outer tube 30 and improve the efficiency of the telescopic device 1.

[0044] It should be understood that the various embodiments of this application can be combined arbitrarily, for example, they can be used individually or in combination with each other to achieve different technical effects, and there is no limitation thereto.

[0045] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A telescopic device, comprising: Inner tube, extending axially; The outer tube is movably fitted onto the outside of the inner tube; A clamping sleeve is disposed on the outside of the inner tube. The clamping sleeve includes a collar and an abutting portion extending from the collar toward the fixing portion. The fixing sleeve includes the fixing part connected to the outer tube and the locking part at least partially sleeved on the outer periphery of the abutting part, the outer wall of the locking part being provided with external threads; The locking sleeve includes a locking part located outside the fixing part, and the inner wall of the locking part is provided with an internal thread that matches the external thread; The clamping sleeve is characterized in that: the clamping sleeve includes a claw extending from the collar away from the abutment portion and an engagement groove located between the claw and the collar, and the locking sleeve includes an engagement portion extending radially from its inner wall, the engagement portion engaging into the engagement groove.

2. The telescopic device as described in claim 1, characterized in that: In the axial direction, the length of the engaging portion is less than the length of the engaging groove.

3. The telescopic device as described in claim 1, characterized in that, The outer diameter of some of the said claws is larger than the inner diameter of the said engaging portion formed within the locking sleeve.

4. The telescopic device as described in claim 1, characterized in that, The telescopic device also includes a bushing connected to the inner tube; the inner wall of the fixing part forms an annular blocking surface, the end of the outer tube abuts against the annular blocking surface, and when the length of the telescopic device reaches its maximum, the end of the bushing abuts against the annular blocking surface.

5. The telescopic device as described in claim 4, characterized in that, The bushing is provided with a limiting protrusion, and the inner tube is provided with an inner tube limiting hole at one end near the outer tube. The limiting protrusion is received in the inner tube limiting hole.

6. The telescopic device as described in claim 1, characterized in that, The abutting portion includes a plurality of wedge-shaped pieces, which are arranged circumferentially to fit the outer side of the inner tube, and the thickness of each wedge-shaped piece decreases along the direction closer to the outer tube.

7. The telescopic device as described in claim 1, characterized in that, The inner wall of the locking part forms a conical surface, and a receiving space is formed between the conical surface and the inner tube. The inner diameter of the receiving space decreases in the direction closer to the outer tube.

8. The telescopic device as described in claim 1, characterized in that, The outer side of the inner tube is recessed inward with an inner tube limiting groove, and the inner wall of the fixing sleeve is provided with a first limiting boss, which engages with the inner tube limiting groove.

9. The telescopic device as described in claim 4, characterized in that, The outer tube has an outer tube limiting groove, which is located at one end of the outer tube near the fixed sleeve. A second limiting protrusion is provided on the annular blocking surface, and the second limiting protrusion is engaged with the outer tube limiting groove.

10. The telescopic device as described in claim 1, characterized in that: The fixing part includes a first locking part and a second locking part extending from its outer peripheral wall at intervals, and a locking gap is formed between the first locking part and the second locking part; the first locking part is provided with a first locking hole, and the second locking part is provided with a second locking hole, the first locking hole and the second locking hole correspond to each other, and an outer tube limiting hole is opened at one end of the outer tube near the fixing part; The telescopic device further includes a limiting plate, a first locking member, and a second locking member. The limiting plate has an insertion hole and an insertion part is formed at one end. The limiting plate is disposed in the locking gap. The insertion part passes through the limiting hole of the outer tube. The first locking member is used to pass through the first locking hole, the insertion hole, and the second locking hole in sequence and then connect with the second locking member.

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