Telescopic rod locking structure

Abstract

The utility model provides a telescopic link locking structure, including inner tube, outer tube and locking device, the locking device includes lock core and lock sleeve, the lock core with the inner tube can be inserted in the outer tube together, the lock sleeve expansion setting, when the static state, the outside size of lock sleeve is greater than the size of outer tube, the lock sleeve is changed and the outside size is reduced to enter the outer tube by pressing, the elastic force of lock sleeve change makes the lock sleeve keep the tendency of outward expansion reset, the force between the outer tube with lock sleeve makes lock sleeve can follow the outer tube rotates or rotates relative lock core, until lock sleeve is clamped between the outer tube with lock core, thereby prevents the inner tube with the outer tube axial telescopic. The utility model discloses through the expansion setting of lock sleeve, adjusts the clearance, force between the inside and outside of lock sleeve and lock core and outer tube, to avoid lock core and lock sleeve synchronous rotation, thereby improves the use stability of locking device's advantage.

Description

Technical Field

[0001] This utility model relates to the field of telescopic rods, and specifically to a telescopic rod locking structure. Background Technology

[0002] Telescopic poles are popular due to their versatility. In daily life, they can be installed in wardrobes to hang clothes, or between two opposite walls to hang shower curtains, towels, and other items. They can also be used as poles for cleaning tools to extend and retract to adjust their length. Most modern telescopic poles use a telescopic structure, where an extendable inner tube is installed inside an outer tube to adjust its support length, thus achieving the telescopic effect.

[0003] For example, patent CN200920199934.7 discloses a spiral tensioning telescopic rod, including an outer tube, an inner tube inserted into the outer tube, and a lock cylinder disposed on the inner tube. One end of the inner tube has a frustum-shaped connector, and the side of the connector has a spiral groove. The head of the connector has a baffle for limiting the lock cylinder. The lock cylinder is formed by combining two semi-circular rings. At least one protrusion inserted into the spiral groove is disposed on the inner wall of the semi-circular rings. During the rotation of the inner tube, the protrusions of the two semi-circular rings slide along the spiral groove on the connector, causing the two semi-circular rings to expand outwards or contract inwards, thereby achieving the locking and unlocking of the inner tube. In actual operation, the connector and lock cylinder of this telescopic rod need to maintain relative rotation. If the size of the outer tube is not suitable or the lock cylinder is worn, a gap may easily appear between the lock cylinder and the outer tube, causing the lock cylinder to rotate synchronously with the connector and fail to lock.

[0004] Therefore, it is necessary to design a telescopic rod locking structure that provides stable locking and a longer service life. Utility Model Content

[0005] One objective of this invention is to provide a telescopic rod locking structure that solves the aforementioned problems.

[0006] To achieve the above-mentioned objectives, this utility model is implemented through the following technical solutions: A telescopic rod locking structure includes an inner tube and an outer tube, with a locking device between the inner tube and the outer tube. The locking device includes a lock cylinder and a lock sleeve. The lock cylinder is fixed to the end of the inner tube, and the lock sleeve is located in the gap between the lock cylinder and the outer tube. The lock cylinder and the inner tube can be inserted into the outer tube together. The lock sleeve is expanded, and in a static state, the outer dimension of the lock sleeve is larger than the dimension of the outer tube. Pressing the lock sleeve causes it to deform and reduce its outer dimension to enter the outer tube. The elastic force generated by the deformation of the lock sleeve keeps the lock sleeve tending to expand and return to its original position, and causes the outer side of the lock sleeve to adhere to the inner surface of the outer tube. The force formed by the outer tube and the lock sleeve adhering to each other allows the lock sleeve to rotate with the outer tube or relative to the lock cylinder. When the lock sleeve rotates, it moves along the surface of the lock cylinder until the lock sleeve is clamped between the outer tube and the lock cylinder, thereby preventing the axial expansion and contraction of the inner tube and the outer tube. The locking device operates on the principle of using the taper and external threads on the surface of the lock cylinder. During the relative rotation of the lock cylinder and the lock sleeve, the lock cylinder provides support to the lock sleeve from the inside, clamping the lock sleeve between the lock cylinder and the outer tube, thus achieving locking. Regardless of whether the inner or outer tube is rotated, the lock cylinder and the lock sleeve must rotate relative to each other, not synchronously. By expanding the lock sleeve, the gap and force between the inner and outer sides of the lock sleeve and the lock cylinder and outer tube are adjusted to prevent the lock cylinder and the lock sleeve from rotating synchronously, thereby improving the stability of the locking device. Furthermore, after the lock cylinder and the lock sleeve wear out, the elastic force of the lock sleeve itself causes the lock sleeve to continue to expand outward, keeping the lock cylinder and the lock sleeve in the same rotational state, thereby extending the service life.

[0007] Preferably, the locking sleeve has an opening on its side. The locking sleeve forms a first end and a second end at the opening and on the side opposite to the opening, respectively. The line connecting the first end and the second end forms a first distance. The locking sleeve forms a third end and a fourth end in the direction opposite to the first end and the second end, respectively. The line connecting the third end and the fourth end forms a second distance. When the locking sleeve is in a stationary state, the first distance is less than the inner diameter of the outer tube, and the second distance is greater than the outer diameter of the outer tube. During installation, pressure is applied to the third end and the fourth end, causing the locking sleeve to deform towards a position that reduces the width of the opening. The second distance shortens to be less than the inner diameter of the outer tube, and the locking sleeve enters the outer tube. The locking sleeve moves to the reset position by the elastic force generated after its deformation, so that the third end and the fourth end fit against the inner surface of the outer tube. The length difference of the second distance before and after the lock sleeve is installed gives the lock sleeve an elastic force that allows it to deform and return to its original shape. It also keeps the third and fourth ends of the lock sleeve in contact with and against the inner surface of the outer tube. The force between the lock sleeve and the outer tube prevents the lock sleeve from rotating with the lock cylinder, thereby improving the stability of the lock cylinder and the lock sleeve.

[0008] Preferably, when the lock sleeve is in a stationary state, the distance between the line connecting the inner sides of the third end and the fourth end is greater than the outer diameter of the outer tube. Adjusting the expansion positions of the third and fourth ends further increases the reset elastic force of the lock sleeve after installation, resulting in a greater interaction force between the lock sleeve and the outer tube.

[0009] Preferably, the second end has an elastic segment, the thickness of which is less than the thickness of the locking sleeve on both sides of the elastic segment. When the third and fourth ends are subjected to force, the elastic segment deforms, and the width of the second distance and the opening changes. The elastic segment makes the deformation of the locking sleeve less strenuous and can also adjust the irregular deformation position to the position of the thin elastic segment, making the deformation movement positions of the third and fourth ends more balanced.

[0010] Preferably, the lock cylinder includes a fixed section and a mating section. The fixed section is inserted into the inner tube and fixed, while the mating section extends from the end of the inner tube. The mating section has a tapered side and external threads. The diameter of the mating section near the inner tube is larger than the diameter away from the inner tube, forming a locking end and an unlocking end respectively. The inner surface of the lock sleeve has internal threads or positioning points. When the lock sleeve rotates relative to the mating section, it can move towards the locking end or the unlocking end under the action of the external threads and internal threads or positioning points. In the tight state, the locking sleeve is located on one side of the locking end. Affected by the size of the locking end, the locking sleeve expands outward or is supported by the locking section to remain in an expanded state. The locking sleeve is clamped between the outer tube and the locking end. The force between the locking sleeve and the outer tube prevents the outer tube and the inner tube from moving telescopically. In the unlocked state, the locking sleeve is located on one side of the unlocked end. The supporting force on the inner side of the locking sleeve decreases, and the force between the outer side of the locking sleeve and the outer tube decreases. The outer tube can move telescopically relative to the inner tube.

[0011] Preferably, even when the lock cylinder is not installed inside the lock sleeve or is not supported by the lock cylinder, the shape and elasticity of the lock sleeve itself can still keep the lock sleeve in contact with the outer tube. Through the compression deformation before and after the lock sleeve is installed, the lock sleeve entering the outer tube automatically releases its elastic force and contacts the outer tube, increasing the friction and elastic force between the lock sleeve and the outer tube. Regardless of whether the outer tube or the inner tube is rotated, the lock sleeve can maintain a relative rotational state with the lock cylinder.

[0012] Preferably, the end of the locking sleeve has a transition section with an inclined outer surface. During installation, the transition section first contacts the opening of the outer tube. As the transition section gradually enters the outer tube, the outer tube gradually pushes the locking sleeve inward along the inclined surface, deforming it to reduce the size of the locking sleeve before it enters the outer tube. The inner and outer tubes are typically made of metal with cutting edges at their openings. Since the locking sleeve's size is larger than the outer diameter of the outer tube, without a transition section, the outer side of the locking sleeve is prone to interference with and being cut by the cutting edge during its entry into the outer tube, affecting the external dimensions of the locking sleeve and its locking effect.

[0013] Preferably, the lock cylinder has a limiting section at the outer end of the mating section, and the width or diameter of the limiting section is greater than the width of the inner side of the lock sleeve, so as to prevent the lock sleeve in a stationary state or in an inwardly deformed state from disengaging from the direction of the limiting section.

[0014] Preferably, the width of the opening when at rest is smaller than the width of the mating section, preventing the locking sleeve and the mating section from automatically separating from the opening position.

[0015] Preferably, the maximum deformable size of the locking sleeve corresponds to the width of the opening. During the deformation of the locking sleeve, the width of the opening gradually decreases until the locking sleeves on both sides of the opening fit together, causing the opening to be in a closed position. At this time, both the first distance and the second distance are less than the inner diameter of the outer tube.

[0016] The advantages of this utility model are as follows: By adjusting the gap and force between the inner and outer sides of the lock sleeve and the lock cylinder and outer tube through the expansion setting of the lock sleeve, the lock cylinder and lock sleeve are prevented from rotating synchronously, thereby improving the stability of the locking device; and after the lock cylinder and lock sleeve are worn, the elastic force of the lock sleeve itself makes the lock sleeve continue to expand outward, so that the lock cylinder and lock sleeve maintain the same rotation state, thereby improving the service life; the setting of the elastic section makes the deformation of the lock sleeve more effortless, and can also adjust the irregular deformation position to the thin elastic section position, so that the deformation activity positions of the third end and the fourth end are more balanced; the inner tube and outer tube are usually made of metal with a cutting edge at the opening, and since the size of the lock sleeve is larger than the outer diameter of the outer tube, if a transition section is not set, the outer side of the lock sleeve is easy to interfere with the cutting edge and be cut by the cutting edge during the process of entering the outer tube, affecting the external size of the lock sleeve and the locking effect of the lock sleeve. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of a locking structure using existing technology.

[0018] Figure 2 This is an exploded diagram of a locking structure using existing technology.

[0019] Figure 3This is a schematic diagram of the lock sleeve of this utility model in a static expansion state.

[0020] Figure 4 This is a schematic diagram of the lock sleeve of this utility model deforming inward to its limit position.

[0021] Figure 5 This is a schematic diagram showing the dimensional relationship between the lock sleeve and the outer tube before installation of this utility model.

[0022] Figure 6 This is a schematic diagram of the lock sleeve of this utility model installed in the lock cylinder.

[0023] Figure 7 This is a schematic diagram of the deformation and fit of the locking sleeve of this utility model when it is installed alone inside the outer tube.

[0024] Figure 8 This is the explosive intent of the telescopic rod of this utility model.

[0025] Figure 9 This is a cross-sectional schematic diagram of the unlocked state of the locking device of this utility model.

[0026] Figure 10 This is a cross-sectional schematic diagram of the locking state of the locking device of this utility model.

[0027] Figure 11 This is a cross-sectional schematic diagram of the transition section and the outer pipe of this utility model in their installation and assembly state. Detailed Implementation

[0028] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so that the implementation of this utility model can be fully understood and carried out based on how technical means are used to solve technical problems and achieve technical effects.

[0029] This utility model uses certain terms to refer to specific components. Those skilled in the art will understand that this specification and claims do not distinguish components by differences in name, but rather by differences in function. It should be noted that, unless otherwise specified, when a component is described as "provided with," "located on," or "located on" another component, it can mean directly provided with or located on another component, or it may also mean there is a component in between; it can be an integral structure or a separate structure. When a component is described as "connected" to another component, it can mean a direct connection or a connection through a component in between; it can be an integral connection, a separate connection, or a contact fit. When a component is described as "located on another component," it does not necessarily mean that the component is located above or on top of the other component; it can be in other positions. The terms "upper," "lower," "left," "right," "high," "lower," and similar expressions used herein are based on the normal placement state of the product and are merely for illustrative purposes. The term "multiple" used herein refers to two or more items. The terms "vertical" and "horizontal" used in this article refer to a state that is roughly vertical or roughly horizontal within a reasonable margin of error, and do not necessarily have to be extremely precise.

[0030] like Figure 1-11 A telescopic rod locking structure includes an inner tube 1 and an outer tube 2, both of which are hollow. The inner tube 1 is inserted into the outer tube 2 and moves axially relative to the outer tube 2. A locking device is provided between the inner tube 1 and the outer tube 2. The locking device can achieve the axial fixation and telescopic movement between the inner tube 1 and the outer tube 2 by switching between a locked state and an unlocked state. The locking device includes a lock cylinder 3 and a lock sleeve 4. The lock cylinder 3 is fixedly installed at the end of the inner tube 1. The size of the lock cylinder 3 is adapted to the inner tube 1. The lock cylinder 3 and the inner tube 1 can be inserted into the outer tube 2 together. The lock sleeve 4 is movably sleeved on the outside of the lock cylinder 3. The lock sleeve 4 can follow the lock cylinder 3 into the outer tube 2. Force is applied to make the inner tube 1 and the outer tube 2 rotate relative to each other, adjusting the mating position of the lock cylinder 3 and the lock sleeve 4, thereby switching between the locked state and the unlocked state.

[0031] In this embodiment, the lock cylinder 3 and the lock sleeve 4 are connected by a thread. During the relative rotation of the lock cylinder 3 and the lock sleeve 4, the position of the lock cylinder 3 and the lock sleeve 4 is adjusted by the thread to adjust the tightness of the fit between the lock cylinder 3, the lock sleeve 4 and the outer tube 2.

[0032] Specifically, the lock cylinder 3 includes a fixed section 5 and a mating section 6. The fixed section 5 is inserted into the inner tube 1 and fixed axially and circumferentially to the inner tube 1. The mating section 6 extends from the end of the inner tube 1. The side of the mating section 6 is provided with a taper and an external thread 7. The diameter of the mating section 6 on the side closer to the inner tube 1 is larger than the diameter on the side farther from the inner tube 1, so as to form a locking end 8 and an unlocking end 9 respectively. The lock sleeve 4 is set in a ring shape, and the inner surface is provided with a taper and an internal thread adapted to the mating section 6. The lock sleeve 4 is installed by wrapping around the outside of the mating section 6. When the lock sleeve 4 rotates relative to the mating section 6, under the action of the internal thread and the external thread 7, the lock sleeve 4 can move towards the locking end. When the locking end 8 or unlocking end 9 moves, in the locked state, the locking sleeve 4 is located on one side of the locking end 8. Affected by the size of the locking end 8, the locking sleeve 4 expands outward or is supported by the locking end 8 and kept in the expanded state. At this time, the outer side of the locking sleeve 4 abuts against the inner surface of the outer tube 2, and the locking sleeve 4 is clamped between the outer tube 2 and the locking end 8. The friction and abutting elastic force between the locking sleeve 4 and the outer tube 2 prevent the outer tube 2 and the inner tube 1 from moving in a telescopic manner. In the unlocked state, the locking sleeve 4 is located on one side of the unlocking end 9, and the inner side of the locking sleeve 4 is no longer supported. The force between the outer side of the locking sleeve 4 and the outer tube 2 is reduced, and the outer tube 2 can move and telescopic relative to the inner tube 1.

[0033] like Figure 1-2 In the prior art, the lock sleeve 4 is fitted to the opposite sides of the lock cylinder 3 by splicing two semi-circular rings 10. There is no connecting structure between the two semi-circular rings 10. During the installation process, the two semi-circular rings 10 need to be pinched by hand or positioned by a clamp before the lock sleeve 4 and the lock cylinder 3 are inserted into the outer tube 2. In order to facilitate the lock sleeve 4 to enter the outer tube 2, the size of the lock sleeve 4 is usually set to be slightly smaller than the inner diameter of the outer tube 2. When switching between the locked and unlocked states, the semi-circular rings 10 of the lock sleeve 4 move closer or further away under the action of the lock cylinder 3 to change the force between the lock sleeve 4 and the outer tube 2. Since the size of the locking sleeve 4 is slightly smaller than the inner diameter of the outer tube 2 during installation, it can be understood that the external size of the locking sleeve 4 is smaller than the inner diameter of the outer tube 2 during the process of moving to the unlocked state or leaving the locked state. As a result, the friction between the outer tube 2 and the locking sleeve 4 becomes smaller, which may lead to the outer tube 2 being unable to drive the locking sleeve 4 to rotate. Alternatively, after repeated use, the contact surface between the outer tube 2 and the locking sleeve 4 may wear down, making it impossible for the outer tube 2 to drive the locking sleeve 4 to rotate to the locked state.

[0034] To improve the stability of the fit between the outer tube 2 and the locking sleeve 4, such as Figure 3-7In this embodiment, the locking sleeve 4 is expanded so that at least part of its size is larger than that of the outer tube 2, and there is a gap between the inner side of the locking sleeve 4 and the mating section 6. During installation, the locking sleeve 4 is first pressed to deform it inward and reduce its size so that it can enter the outer tube 2. The locking sleeve 4 is made of plastic material, and by reducing its thickness, the locking sleeve 4 itself becomes elastic. After the locking sleeve 4 enters the outer tube 2, the force on the outside is removed, and the elasticity of the locking sleeve 4 causes it to return to its original position and open until the outer surface of the locking sleeve 4 is in contact with the inner surface of the outer tube 2. The elastic force ultimately keeps the locking sleeve 4 in a state of contact and abutment with the outer tube 2, thereby increasing the friction and abutment force between the locking sleeve 4 and the outer tube 2, and improving the rotational synchronization of the locking sleeve 4 and the outer tube 2. That is to say, even if the locking cylinder 3 is not installed on the inner side of the locking sleeve 4 or the inner side is not supported by the locking cylinder 3, the shape and elasticity of the locking sleeve 4 itself can still keep the locking sleeve 4 in a state of contact with the outer tube 2.

[0035] Preferably, both the inner tube 1 and the outer tube 2 are circular tubes, and the locking sleeve 4 is a C-shaped ring with an opening 11 on one side. The locking sleeve 4 forms a first end A and a second end B at the opening 11 and on the side opposite to the opening 11, respectively. The line connecting the first end A and the second end B forms a first distance X. The locking sleeve 4 forms a third end C and a fourth end D in a direction perpendicular to the first distance X, respectively. The line connecting the third end C and the fourth end D forms a second distance Y. In this embodiment, the first distance X of the locking sleeve 4 in a stationary state is smaller than the inner diameter of the outer tube 2, and the second distance Y is larger than the outer diameter φ of the outer tube 2, making the cross-section of the locking sleeve 4 elliptical or racetrack-shaped. During installation, the second distance X is formed by the first end C and the fourth end D. The locking sleeve 4 is pressed down by the third end C and the fourth end D, causing it to deform towards the position where the opening 11 is narrowed, thus shortening the second distance Y to a size smaller than the inner diameter of the outer tube 2. During the application of force, the second end B is squeezed outward by both sides, causing the first distance X to extend. This causes the first end A and the second end B to move or deform towards the position of the outer tube 2, or even to make the first end A and the second end B fit against the inner surface of the outer tube 2. After the locking sleeve 4 partially enters the outer tube 2, the pressing force of the third end C and the fourth end D is released, and the locking sleeve 4 is pushed axially into the outer tube 2 as a whole. After the third end C and the fourth end D of the locking sleeve 4 are freed from the external pressing force, the deformed parts are deformed by their own deformation. The elastic force moves towards the reset position. For example, the deformation elastic force of the third end C causes it to move inward to reset, and drives the third end C and the fourth end D to reset outward, extending the second distance Y and increasing the width of the opening 11, until the third end C and the fourth end D simultaneously adhere to the inner surface of the outer tube 2, making the length of the second distance Y equal to the inner diameter of the outer tube 2. The outer tube 2's obstruction on the outside prevents the locking sleeve 4 from continuing to elastically reset. The portion of the elastic force that is not converted into reset movement causes the third end C and the fourth end D to maintain the tendency to continue resetting outward to resist the outer tube 2, and is converted into the elastic force of the third end C, the fourth end D, and the outer tube 2 pressing against each other. By increasing the elastic force of the third end C, the fourth end D, and the outer tube 2, the locking sleeve 4 continues to elastically reset. The elastic force between the tubes 2 increases the friction between the outer tube 2 and the locking sleeve 4 when the outer tube 2 rotates. Compared with the prior art where the size of the locking sleeve 4 is smaller than the inner diameter of the outer tube 2, the friction between the outer tube 2 and the locking sleeve 4 is greater in this embodiment, and the rotation linkage synchronization between the outer tube 2 and the locking sleeve 4 is better. Even if the third end C and the fourth end D are present in the friction and wear of the outer tube 2 during the extension and rotation process, the excess elastic force of the locking sleeve 4 can still make the third end C and the fourth end D continue to move outward to make up for the gap. The third end C and the fourth end D can still fit and abut against the inner surface of the outer tube 2. On the basis of improving the rotation synchronization, the service life of the locking sleeve 4 can also be extended.

[0036] It should be noted that in this embodiment, the first distance X and the second distance Y are both the distance between the outer sides of the lock sleeve 4.

[0037] Preferably, the distance between the inner side of the third end C and the inner side of the fourth end D is also greater than the outer diameter φ of the outer tube 2. By increasing the expansion size, the elastic force of the locking sleeve 4 is further enhanced, making the fit between the locking sleeve 4 and the outer tube 2 tighter and more stable.

[0038] In the above embodiments, the unlocking and locking activities of the locking device are described in the manner that the inner tube 1 is stationary and the outer tube 2 rotates. That is, the force between the outer tube 2 and the locking sleeve 4 causes them to rotate synchronously and relative to the inner tube 1 and the lock cylinder 3, thereby achieving the clamping and loosening of the locking sleeve 4 under the action of the taper of the lock cylinder 3 and the external thread 7.

[0039] Of course, besides the aforementioned rotation method, the unlocking and locking activities of the locking device can also be understood as the outer tube 2 remaining stationary while the inner tube 1 rotates. In this mode, the inner tube 1 drives the lock cylinder 3 to rotate. The force between the lock sleeve 4 and the outer tube 2, or the gap between the lock sleeve 4 and the lock cylinder 3, prevents the lock sleeve 4 from rotating with the lock cylinder 3. The lock sleeve 4 only rotates with the lock cylinder 3 when the lock cylinder 3 and the lock sleeve 4 are about to be tightened, or when the inner and outer sides of the lock sleeve 4 are supported by the lock cylinder 3 and the outer tube 2, thus entering the locked state. In this rotation method, the lock sleeve 4 needs to have a supporting force. If the lock sleeve 4 is not in contact with the outer tube 2, or if the lock sleeve 4 is not installed in the outer tube 2, rotating the inner tube 1 and the lock cylinder 3 will not provide support or other forces to the outer side of the lock sleeve 4. The lock sleeve 4 will rotate synchronously with the inner tube 1 and the lock cylinder 3, and the lock cylinder 3 and the lock sleeve 4 cannot move or change position along the thread axis. Therefore, in this embodiment, the expansion sleeve 4 increases the force between the sleeve 4 and the outer tube 2 by tightening the connection between them. Regardless of how the inner tube 1 and the outer tube 2 rotate, the sleeve 4 can rotate relative to the lock cylinder 3, thereby improving the stability of the locking device.

[0040] Preferably, the second end B is provided with an elastic segment 12. The thickness of the elastic segment 12 is less than the thickness of the lock sleeves 4 on both sides, and the elastic segment 12 has a corresponding width. By adjusting the thickness, the range of deformation of the lock sleeve 4 is expanded to increase the elastic force for the lock sleeve 4 to reset. At the same time, the force required for the same degree of deformation can be reduced, making it easier to install the lock sleeve 4. In this embodiment, the width of the opening 11 when it is at rest is less than the width of the mating segment 6 to prevent the lock sleeve 4 from automatically falling off from the opening 11 after it is installed on the mating segment 6. When installing the lock sleeve 4, the second distance Y and the width of the opening 11 are increased first, and the side of the mating segment 6 can pass through the opening 11 and enter the lock sleeve 4. In this embodiment, the maximum deformable size of the locking sleeve 4 corresponds to the width of the opening 11. That is, when the locking sleeve 4 is stationary and not deformed, the width of the opening 11 is the largest. During the deformation process of the locking sleeve 4, the width of the opening 11 gradually decreases until the locking sleeves 4 on both sides of the opening 11 fit together to make the opening 11 closed. At this time, the locking sleeve 4 stops deforming. At this time, the first distance X and the second distance Y are both less than the inner diameter of the outer tube 2.

[0041] To prevent the lock sleeve 4 from detaching from the end of the lock cylinder 3, the lock cylinder 3 is provided with a limiting section 13 at the outer end of the mating section 6. The width or diameter of the limiting section 13 is greater than the width of the inner side of the lock sleeve 4. The lock sleeve 4 can only leave the mating section 6 from the position of the limiting section 13 after deforming outward, thereby preventing the lock sleeve 4 in a stationary state or in an inwardly deformed state from detaching from the direction of the limiting section 13.

[0042] In the above embodiment, the external thread 7 is set as a complete thread, and the internal thread can be set as a complete thread or as a plurality of positioning points 14 spaced apart along the thread shape. The positioning points 14 extend into the external thread 7 and cooperate with the external thread 7. Each positioning point 14 plays the same role as the internal thread. In this embodiment, positioning points 14 are provided on the inner side of the third end C and the fourth end D, and the heights of the two positioning points 14 are different. When the locking sleeve 4 is installed on the mating section 6, the two positioning points 14 enter the thread grooves of different heights of the external thread 7 to cooperate.

[0043] Preferred, such as Figure 11 The end of the lock sleeve 4 is provided with a transition section 15. The outer surface of the transition section 15 is inclined. When the lock sleeve 4 is installed, the transition section 15 first contacts the opening of the outer tube 2. As the transition section 15 gradually enters the outer tube 2, the outer tube 2 gradually pushes the lock sleeve 4 inward along the inclined surface to reduce the size of the lock sleeve 4 and enter the outer tube 2. The outer tube 2 is made of metal. The setting of the transition section 15 can also prevent the cutting edge of the opening of the outer tube 2 from cutting the lock sleeve 4, thereby maintaining the integrity of the lock sleeve 4.

[0044] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A telescopic rod locking structure, comprising an inner tube and an outer tube, wherein a locking device is provided between the inner tube and the outer tube, the locking device comprising a lock cylinder and a lock sleeve, the lock cylinder being fixed to the end of the inner tube, the lock sleeve being located in the gap between the lock cylinder and the outer tube, and the lock cylinder and the inner tube being able to be inserted together into the outer tube, characterized in that, The locking sleeve is expanded, and in a static state, the outer dimension of the locking sleeve is larger than the dimension of the outer tube. Pressing the locking sleeve causes it to deform and reduce its outer dimension so that it can enter the outer tube. The elastic force generated by the deformation of the locking sleeve makes the locking sleeve maintain the tendency to expand and return to its original position, and makes the outer side of the locking sleeve adhere to the inner surface of the outer tube. The force between the outer tube and the locking sleeve allows the locking sleeve to rotate with the outer tube or relative to the lock cylinder. When the locking sleeve rotates, it moves along the surface of the lock cylinder until the locking sleeve is clamped between the outer tube and the lock cylinder, thereby preventing the axial expansion and contraction of the inner tube and the outer tube.

2. The telescopic rod locking structure according to claim 1, characterized in that, The locking sleeve has an opening on its side. The locking sleeve forms a first end and a second end at the opening and on the side opposite to the opening, respectively. A line connecting the first end and the second end forms a first distance. The locking sleeve forms a third end and a fourth end in the direction opposite to the first and second ends, respectively. A line connecting the third end and the fourth end forms a second distance. When the locking sleeve is stationary, the first distance is less than the inner diameter of the outer tube, and the second distance is greater than the outer diameter of the outer tube. During installation, pressure is applied to the third end and the fourth end, causing the locking sleeve to deform towards a position where the opening width is reduced. The second distance shortens to be less than the inner diameter of the outer tube, and the locking sleeve enters the outer tube. The locking sleeve moves to its reset position due to the elastic force generated by its deformation, causing the third end and the fourth end to fit against the inner surface of the outer tube.

3. The telescopic rod locking structure according to claim 2, characterized in that, When the locking sleeve is in a stationary state, the distance between the line connecting the inner side of the third end and the inner side of the fourth end is greater than the outer diameter of the outer tube.

4. The telescopic rod locking structure according to claim 2, characterized in that, The second end is provided with an elastic segment, the thickness of which is less than the thickness of the locking sleeves on both sides of the elastic segment. When the third end and the fourth end are subjected to force, the elastic segment deforms, and the second distance and the width of the opening change.

5. The telescopic rod locking structure according to claim 4, characterized in that, The lock cylinder includes a fixed section and a mating section. The fixed section is inserted into the inner tube and fixed in place. The mating section extends from the end of the inner tube. The side of the mating section is tapered and has external threads. The diameter of the mating section on the side closer to the inner tube is larger than the diameter on the side farther from the inner tube, forming a locking end and an unlocking end respectively. The inner surface of the lock sleeve has internal threads or positioning points. When the lock sleeve rotates relative to the mating section, it can move towards the locking end or the unlocking end under the action of the external threads and internal threads or positioning points; in the locked state... In the lower state, the locking sleeve is located on one side of the locking end. Affected by the size of the locking end, the locking sleeve expands outward or is supported by the locking end and kept in an expanded state. The locking sleeve is clamped between the outer tube and the locking end. The force between the locking sleeve and the outer tube prevents the outer tube and the inner tube from moving telescopically. In the unlocked state, the locking sleeve is located on one side of the unlocking end. The supporting force on the inner side of the locking sleeve decreases, and the force between the outer side of the locking sleeve and the outer tube decreases. The outer tube can move telescopically relative to the inner tube.

6. The telescopic rod locking structure according to claim 5, characterized in that, Even when the lock cylinder is not installed on the inner side of the lock sleeve or the inner side of the lock sleeve is not supported by the lock cylinder, the shape and elasticity of the lock sleeve itself can still keep the lock sleeve in contact with the outer tube.

7. The telescopic rod locking structure according to claim 6, characterized in that, The end of the lock sleeve is provided with a transition section, and the outer surface of the transition section is inclined. When the lock sleeve is installed, the transition section first contacts the opening of the outer tube. As the transition section gradually enters the outer tube, the outer tube gradually pushes the lock sleeve inward along the inclined surface to reduce the size of the lock sleeve and enter the outer tube.

8. The telescopic rod locking structure according to claim 7, characterized in that, The lock cylinder has a limiting section at the outer end of the mating section. The width or diameter of the limiting section is greater than the width of the inner side of the lock sleeve, so as to prevent the lock sleeve in a stationary state or in an inwardly deformed state from disengaging from the direction of the limiting section.

9. The telescopic rod locking structure according to claim 8, characterized in that, The width of the opening when at rest is less than the width of the mating section, preventing the lock sleeve and the mating section from automatically separating from the opening position.

10. The telescopic rod locking structure according to claim 9, characterized in that, The maximum deformable size of the locking sleeve corresponds to the width of the opening. During the deformation of the locking sleeve, the width of the opening gradually decreases until the locking sleeves on both sides of the opening fit together, causing the opening to be in a closed position. At this time, both the first distance and the second distance are less than the inner diameter of the outer tube.

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