Telescopic pipe group capable of being quickly locked and unlocked

Abstract

The utility model discloses a telescopic pipe group capable of being quickly locked and unlocked, which comprises a first unit pipe, a second unit pipe and a third unit pipe, and a first thread locking structure is arranged at the bottom end of the second unit pipe. The top end of the third unit pipe is sleeved in a pipe cavity at the bottom end of the second unit pipe and is in telescopic locking connection with the second unit pipe through a first thread locking structure; a second thread locking structure is arranged at the bottom end of the first unit pipe, and the top end of the second unit pipe is connected into a pipe cavity in the bottom end of the first unit pipe in a sleeved mode and connected with the first unit pipe in a telescopic locking mode through the second thread locking structure. The second thread locking structure comprises a second external thread connecting part and a second internal thread locking sleeve which is detachably connected with the external thread of the second external thread connecting part; the outer side of the second unit pipe is sleeved with an outer sleeve, and the bottom end of the outer sleeve is fixedly connected with the top of the first internal thread locking sleeve. According to the structure, other complex linkage devices are not needed, and the manufacturing cost and the maintenance cost are lower than those of an existing tripod telescopic pipe set provided with a linkage locking device.

Description

Technical Field

[0001] This utility model relates to the field of photographic equipment technology, and in particular to a telescopic tube assembly that can be quickly locked and unlocked. Background Technology

[0002] A tripod is a support frame used to stabilize photographic equipment to achieve certain photographic effects. For example, when shooting night scenes or photos with motion blur, a longer exposure time is needed, and the digital camera must not shake during this process; therefore, a tripod is required to stabilize the camera. Most tripods currently consist of components such as legs, a base, a center column, and a head. For ease of storage and portability, tripod legs mostly use telescopic tube assemblies. Existing telescopic tube assemblies use locking mechanisms at the ends of the individual tubes for locking and unlocking, making the tripod's unfolding and folding process cumbersome.

[0003] To address this technical problem, Chinese invention patent CN113375016B discloses a linkage locking device and a telescopic bracket. This linkage locking device includes: a fixed structure connecting the insertion end of a positioning tube; a guiding structure including a guide sleeve with a locking port extending to the external space on its inner wall; a rotating structure including a rotating cylinder rotatably connected to the fixed structure and a lifting column slidably connected to the side surface of the rotating cylinder; a power structure including a transmission rod inserted into the rotating cylinder; and a locking structure including a linkage mechanism, a lever mechanism rotatably connected to the fixed structure, and a pressing mechanism connected to the guide sleeve. One end of the linkage mechanism is connected to one end of the lever mechanism, and the pressing mechanism includes a lever arm and a pressing plate. The lever arm is rotatably connected to the side surface of the guide sleeve, one end of the linkage mechanism is connected to one end of the lever arm, and the other end of the lever arm is connected to the pressing plate. This structure, through components such as the linkage mechanism, lifting column, lever mechanism, and lever arm, constitutes a linkage locking device and simultaneously locks the inner sleeve, positioning tube, and outer sleeve. In practical use, this structure has high manufacturing and maintenance costs, hindering large-scale product promotion and use. Utility Model Content

[0004] The main purpose of this utility model is to propose a telescopic tube assembly that can be quickly locked and unlocked, aiming to solve the technical problem that the existing tube assemblies for achieving one-click quick locking of telescopic tube tripods have high manufacturing and maintenance costs, which are not conducive to the large-scale promotion and use of the products.

[0005] To achieve the above objectives, this utility model proposes a telescopic tube assembly capable of quick locking and unlocking, comprising a first unit tube, a second unit tube, and a third unit tube. The bottom end of the second unit tube is provided with a first threaded locking structure. The top end of the third unit tube is sleeved within the bottom cavity of the second unit tube and is telescopically and lockably connected to the second unit tube via the first threaded locking structure. The first threaded locking structure includes a first external threaded connection portion at the bottom end of the second unit tube and a first internal threaded locking sleeve detachably connected to the outer thread of the first external threaded connection portion. The bottom end of the first unit tube is provided with a second threaded locking structure, and the top end of the third unit tube is sleeved within the bottom cavity of the second unit tube. The bottom end of the first unit tube is connected to the first unit tube in a retractable locking connection via a second threaded locking structure. The second threaded locking structure includes a second external threaded connection part at the bottom end of the first unit tube and a second internal threaded locking sleeve that is detachably connected to the outer thread of the second external threaded connection part. An outer sleeve is fitted onto the outside of the second unit tube. The bottom end of the outer sleeve is fixedly connected to the top of the first internal threaded locking sleeve. The outer wall of the outer sleeve is provided with an axially limiting section. The bottom inner wall of the second internal threaded locking sleeve is provided with a convex surface that matches the limiting section. The top of the outer sleeve and the second internal threaded locking sleeve are retractably connected via the convex surface and the limiting section.

[0006] Optionally, the top inner wall of the first internal thread locking sleeve is provided with an internal thread that matches the first external thread connection part, and the bottom inner wall of the first internal thread locking sleeve is provided with a first snap-fit ​​protrusion ring. The first internal thread locking sleeve is snap-fitted to the first locking pad through the first snap-fit ​​protrusion ring. The top side wall of the first locking pad is provided with a locking part with a wedge-shaped cross section, and the bottom outer side wall of the first locking pad is provided with a first annular groove. The bottom of the first locking pad is snap-fitted to the first snap-fit ​​protrusion ring through the first annular groove. The wedge-shaped locking part of the first locking pad is retractably and abuts against the first external thread connection part and the third unit tube. The second internal thread locking sleeve has an internal thread on its top inner sidewall that matches the second external thread connection part. The second internal thread locking sleeve has a second snap-fit ​​protrusion on its bottom inner sidewall. The second internal thread locking sleeve is snap-fitted to the second locking pad through the second snap-fit ​​protrusion. The second locking pad has a wedge-shaped locking part on its top sidewall. The second locking pad has a second annular groove on its bottom outer sidewall. The bottom of the second locking pad is snap-fitted to the second snap-fit ​​protrusion through the second annular groove. The wedge-shaped locking part of the second locking pad is retractably and abuts against the second external thread connection part and the second unit tube.

[0007] Optionally, the inner wall of the first external threaded connection portion is provided with a first gradually thickened locking surface, and the inner wall of the second external threaded connection portion is provided with a second gradually thickened locking surface.

[0008] Optionally, the inner wall of the first unit tube is provided with a first guide protrusion along the axial direction, the top side wall of the second unit tube is provided with a pair of first connecting through holes, the top outer side wall of the second unit tube is provided with a first limiting washer, the inner side wall of the first limiting washer is provided with a first limiting boss that matches the first connecting through hole, the side wall of the first limiting washer is provided with a first guide groove that matches the first guide protrusion, and the bottom of the first limiting washer is provided with a sleeve connecting groove.

[0009] Optionally, the first limiting pad ring is a set of opposing ring pieces, and the top inner sidewall of the first limiting pad ring is provided with a first positioning protrusion ring.

[0010] Optionally, the inner wall of the second unit tube is provided with a second guide protrusion along the axial direction, the top side wall of the third unit tube is provided with a pair of second connecting through holes, the top outer side wall of the third unit tube is provided with a second limiting washer, the inner side wall of the second limiting washer is provided with a second limiting boss that matches the second connecting through holes, and the side wall of the second limiting washer is provided with a second guide groove that matches the second guide protrusion.

[0011] Optionally, the second limiting pad ring is a set of opposing ring pieces, and the top inner sidewall of the second limiting pad ring is provided with a second positioning protrusion ring.

[0012] Optionally, the top of the first internal threaded locking sleeve is provided with a threaded fixing through hole, and a fixing screw is connected to the internal thread of the threaded fixing through hole. The first internal threaded locking sleeve is fixedly connected to the outer sleeve by the fixing screw through compression.

[0013] Optionally, the outer wall of the second internal thread locking sleeve is provided with an axial anti-slip strip.

[0014] The beneficial effects of this utility model are:

[0015] In this embodiment of the invention, the telescopic tube assembly capable of quick locking and unlocking is installed with the top end of the first unit tube connected to the tripod base and the bottom end of the third unit tube fixedly connected to the foot pad. When the tripod is extended, the second and third unit tubes are extended to the target length. Rotating the first internal thread locking sleeve, the outer sleeve, or the second internal thread locking sleeve in the forward direction causes the first and second internal thread locking sleeves to engage in a linkage action due to the outer sleeve, allowing them to lock simultaneously. Conversely, rotating the first and second thread locking structures in the reverse direction allows them to unlock simultaneously. Compared to traditional tripod telescopic tube assemblies, this structure only adds an outer sleeve and changes the structure of some components, without requiring other complex linkage devices. Therefore, the manufacturing and maintenance costs are lower than existing tripod telescopic tube assemblies with linkage locking devices, making it more conducive to the large-scale promotion and use of this product. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a telescopic tube assembly that can be quickly locked and unlocked according to an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of a telescopic tube assembly that can be quickly locked and unlocked according to an embodiment of the present invention;

[0019] Figure 3 for Figure 2 Enlarged cross-sectional view of the unlocked state of area 07 in the middle;

[0020] Figure 4 for Figure 2 Enlarged cross-sectional view of the locked state of area 07;

[0021] Figure 5 for Figure 2 Enlarged cross-sectional view of the unlocked state of area 06 in the middle;

[0022] Figure 6 for Figure 2 Enlarged cross-sectional view of the locked state of region 06;

[0023] Figure 7 This is an exploded view of a telescopic tube assembly that can be quickly locked and unlocked according to an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of the second internal thread locking sleeve.

[0025] Explanation of icon numbers:

[0026] 01 First unit tube, 011 Second external threaded connection part, 012 Second gradually thickened locking surface, 013 First guide protrusion, 03 Second unit tube, 031 First external threaded connection part, 032 First gradually thickened locking surface, 033 First connecting through hole, 034 First limiting boss, 035 First limiting washer, 036 First guide groove, 037 Sleeve connecting groove, 038 First positioning protrusion, 039 Second guide protrusion, 05 Third unit tube, 051 Second connecting through hole, 052 Second limiting washer, 053 Second Limiting boss, 055 second guide groove, 056 second positioning protrusion ring, 06 first threaded locking structure, 061 first internal threaded locking sleeve, 062 first snap-fit ​​protrusion ring, 063 first locking pad, 065 locking part, 066 first annular groove, 067 threaded fixing through hole, 068 fixing screw, 07 second threaded locking structure, 071 second internal threaded locking sleeve, 072 second snap-fit ​​protrusion ring, 073 second locking pad, 076 second annular groove, 077 convex surface, 078 anti-slip strip, 08 outer sleeve, 081 limiting cut surface.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection of the claims of this utility model.

[0031] Please refer to Figures 1 to 8 This utility model provides a telescopic tube assembly (hereinafter referred to as the telescopic tube assembly) that can be quickly locked and unlocked, including a first unit tube 01, a second unit tube 03 and a third unit tube 05. In the installed state, the top end of the third unit tube is inserted into the bottom end of the second unit tube and can be telescopically connected. The top end of the second unit tube is inserted into the bottom end of the first unit tube and can be telescopically connected. The bottom end of the second unit tube 03 is provided with a first threaded locking structure 06. The top end of the third unit tube 05 is sleeved in the bottom end cavity of the second unit tube 03 and is retractably locked to the second unit tube 03 through the first threaded locking structure 06. The first threaded locking structure 06 includes a first external threaded connection part 031 provided at the bottom end of the second unit tube 03 and a first internal threaded locking sleeve 061 detachably connected to the outer thread of the first external threaded connection part 031. The bottom end of the first unit tube 01 is provided with a second threaded locking structure 07. The top end of the second unit tube 03 is sleeved in the bottom end cavity of the first unit tube 01 and is retractably locked to the first unit tube 01 through the second threaded locking structure 07. The second threaded locking structure 07 includes a second external threaded connection part 011 provided at the bottom end of the first unit tube 01 and a second internal threaded locking sleeve 071 detachably connected to the outer thread of the second external threaded connection part 011.

[0032] Specifically, the top inner wall of the first internal thread locking sleeve 061 is provided with an internal thread that matches the first external thread connection part 031, and the bottom inner wall of the first internal thread locking sleeve 061 is provided with a first snap-fit ​​protrusion ring 062. The first internal thread locking sleeve 061 is snap-fitted to the first locking pad 063 through the first snap-fit ​​protrusion ring 062. The top side wall of the first locking pad 063 is provided with a locking part 065 with a wedge-shaped cross section, and the bottom outer side wall of the first locking pad 063 is provided with a first annular groove 066. The bottom of the first locking pad 063 is snap-fitted to the first snap-fit ​​protrusion ring 062 through the first annular groove 066. The locking part 065 of the first locking pad is retractably abutting against the first external thread connection part 031 and the third unit tube 05. During locking, rotating the first internal thread locking sleeve in the forward direction causes it to move upward along the first external thread connection, causing the locking part of the first locking pad to engage between the inner wall of the first external thread connection and the outer wall of the third unit tube. The compression of the first locking pad locks the second and third unit tubes relative to each other. Rotating the first internal thread locking sleeve in the reverse direction causes it to move downward along the first external thread connection, disengaging the locking part of the first locking pad from between the inner wall of the first external thread connection and the outer wall of the third unit tube, thus releasing the lock between the second and third unit tubes.

[0033] Meanwhile, the top inner wall of the second internal thread locking sleeve 071 is provided with an internal thread that matches the second external thread connection part 011, and the bottom inner wall of the second internal thread locking sleeve 071 is provided with a second snap-fit ​​protrusion ring 072. The second internal thread locking sleeve 071 is snap-fitted to the second locking pad 073 through the second snap-fit ​​protrusion ring 072. The top side wall of the second locking pad 073 is provided with a wedge-shaped locking part 065, and the bottom outer side wall of the second locking pad 073 is provided with a second annular groove 076. The bottom of the second locking pad 073 is snap-fitted to the second snap-fit ​​protrusion ring 072 through the second annular groove 076. The locking part of the second locking pad is retractably connected to the second external thread connection part 011 and the second unit tube 03. When locking, rotating the second internal thread locking sleeve in the forward direction causes it to move upward along the second external thread connection, causing the locking part of the second locking pad to engage between the inner wall of the second external thread connection and the outer wall of the second unit tube. The compression of the second locking pad locks the second unit tube relative to the first unit tube. Rotating the second internal thread locking sleeve in the reverse direction causes it to move downward along the second external thread connection, disengaging the locking part of the second locking pad from between the inner wall of the second external thread connection and the outer wall of the second unit tube, thus releasing the lock between the second and first unit tubes.

[0034] To enable the first and second internal threaded locking sleeves to move together, an outer sleeve 08 is fitted onto the outside of the second unit tube 03. The bottom end of the outer sleeve 08 is fixedly connected to the top of the first internal threaded locking sleeve 061. The outer wall of the outer sleeve 08 is provided with an axially oriented limiting section 081. The bottom inner wall of the second internal threaded locking sleeve 071 is provided with a convex surface 077 that matches the limiting section. The top of the outer sleeve 08 and the second internal threaded locking sleeve 071 are retractably connected via the convex surface 077 and the limiting section 081. To facilitate the sliding of the outer sleeve within the second internal threaded locking sleeve, a second locking pad is also provided with a second convex surface that matches the limiting section. The locking part of the second locking pad is retractably connected to the second external threaded connection part 011 and the outer sleeve 08. The bottom end of the outer tube is fixedly connected to the top of the first internal thread locking sleeve, and the top of the outer tube is retractably connected to the second internal thread locking sleeve. No matter which part of the first internal thread locking sleeve, the second internal thread locking sleeve, or the outer tube is rotated, the other two parts will rotate accordingly, thereby achieving the technical effect of linkage between the first internal thread locking sleeve and the second internal thread locking sleeve.

[0035] During use, the top end of the first unit tube is fixedly connected to the tripod base, and the bottom end of the third unit tube is fixedly connected to the foot pads. When the tripod is extended, the second and third unit tubes are extended or retracted to the target length. Rotating the first internal thread locking sleeve, the outer sleeve, or the second internal thread locking sleeve in the forward direction causes the first and second internal thread locking sleeves to engage in a linkage action due to the outer sleeve, allowing the first and second thread locking structures to lock simultaneously. Conversely, rotating the first and second thread locking structures in the reverse direction allows them to unlock simultaneously. Compared to traditional tripod telescopic tube assemblies, this structure only adds an outer sleeve and changes the structure of some components, without requiring other complex linkage devices. Therefore, the manufacturing and maintenance costs are lower than existing tripod telescopic tube assemblies with linkage locking devices, making it more conducive to the large-scale promotion and use of this product.

[0036] To further enhance the locking effect of this telescopic tube assembly, in one embodiment, the inner wall of the first external threaded connection 031 is provided with a first gradually thickening locking surface 032, and the inner wall of the second external threaded connection 011 is provided with a second gradually thickening locking surface 012. When locked, the first and second gradually thickening locking surfaces can better fit against the wedge-shaped locking portion, thereby increasing the friction at the contact interface and ultimately enhancing the locking effect of the first and second threaded locking structures.

[0037] To prevent the second unit tube from detaching from the bottom of the first unit tube during the telescopic tube assembly, in one embodiment, the inner wall of the first unit tube 01 is provided with a first axial guide protrusion 013, the top side wall of the second unit tube 03 is provided with a pair of first connecting through holes 033, the top outer side wall of the second unit tube 03 is provided with a first limiting washer 035, the inner side wall of the first limiting washer 035 is provided with a first limiting boss 034 that matches the first connecting through hole 033, the side wall of the first limiting washer 035 is provided with a first guide groove 036 that matches the first guide protrusion 013, and the bottom of the first limiting washer 035 is provided with a sleeve connecting groove 037. During installation, the first limiting washer ring is engaged with the first connecting through hole via the first limiting boss and installed on the top outer wall of the second unit tube. The top of the outer sleeve is installed in the sleeve connecting groove. When the outer sleeve and the second unit tube slide to the bottom of the first unit tube, the sleeve connecting groove side wall of the first limiting washer ring abuts against the second locking washer. This prevents the second unit tube from coming out of the bottom of the first unit tube if the second internal thread locking sleeve is not completely removed.

[0038] To facilitate the installation of the first limiting ring gasket, the first limiting ring 035 consists of a set of opposing ring pieces, with the connecting gap between the ring pieces being a first guide groove 036. A first positioning protrusion 038 is provided on the top inner sidewall of the first limiting ring 035. The first positioning protrusion can further support the second unit tube.

[0039] To prevent the third unit tube from detaching from the bottom of the second unit tube during the telescopic tube assembly, in one embodiment, the inner wall of the second unit tube 03 is provided with a second axially oriented guide protrusion 039, the top side wall of the third unit tube 05 is provided with a pair of second connecting through holes 051, the top outer side wall of the third unit tube 05 is provided with a second limiting washer 052, the inner side wall of the second limiting washer 052 is provided with a second limiting boss 053 matching the second connecting through hole 051, and the side wall of the second limiting washer 052 is provided with a second guide groove 055 matching the second guide protrusion 039. During installation, the second limiting washer is engaged with the second connecting through hole via the second limiting boss and installed on the top outer side wall of the third unit tube. When the third unit tube slides to the bottom of the second unit tube during telescopic extension, the bottom wall of the second limiting washer abuts against the first locking washer, thereby preventing the third unit tube from detaching from the bottom of the second unit tube if the first internal thread locking sleeve is not completely removed.

[0040] To facilitate the installation of the second limiting ring, the second limiting ring 052 is a set of opposing ring pieces, and the connection gap between the ring pieces is the second guide groove 055. The top inner wall of the second limiting ring 052 is provided with a second positioning protrusion 056, which can further support the third unit tube.

[0041] To facilitate the installation and fixing of the first internal threaded locking sleeve and the outer sleeve, in one embodiment, the top of the first internal threaded locking sleeve 061 is provided with a threaded fixing through hole 067, and the threaded fixing through hole 067 is internally threaded to connect a fixing screw 068. The first internal threaded locking sleeve 061 is pressed and fixedly connected to the outer sleeve 08 by the fixing screw 068.

[0042] In one embodiment, the outer wall of the second internal thread locking sleeve 071 is provided with an axially oriented anti-slip strip 078. The anti-slip strip can increase the friction coefficient at the point of force application when the second internal thread locking sleeve is rotated, making it easier to lock and unlock the telescopic tube assembly.

[0043] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A telescopic tube set capable of quick locking and unlocking, comprising a first unit tube, a second unit tube and a third unit tube, characterized in that, The bottom end of the second unit tube is provided with a first threaded locking structure. The top end of the third unit tube is sleeved inside the bottom end cavity of the second unit tube and is retractably locked to the second unit tube through the first threaded locking structure. The first threaded locking structure includes a first external threaded connection part provided at the bottom end of the second unit tube and a first internal threaded locking sleeve detachably connected to the outer thread of the first external threaded connection part. The bottom end of the first unit tube is provided with a second threaded locking structure, and the top end of the second unit tube is sleeved inside the bottom end cavity of the first unit tube and is retractably locked to the first unit tube through the second threaded locking structure. The unit tube is retractable and lockable. The second threaded locking structure includes a second external threaded connection part provided at the bottom end of the first unit tube and a second internal threaded locking sleeve that is detachably connected to the outer thread of the second external threaded connection part. An outer sleeve is sleeved on the outside of the second unit tube. The bottom end of the outer sleeve is fixedly connected to the top of the first internal threaded locking sleeve. The outer wall of the outer sleeve is provided with a limiting section along the axial direction. The bottom inner wall of the second internal threaded locking sleeve is provided with a convex surface that matches the limiting section. The top of the outer sleeve and the second internal threaded locking sleeve are retractably sleeved and connected through the convex surface and the limiting section.

2. The quick-locking and unlocking telescopic pipe set according to claim 1, wherein, The top inner wall of the first internal thread locking sleeve is provided with an internal thread that matches the first external thread connection part. The bottom inner wall of the first internal thread locking sleeve is provided with a first snap-fit ​​protrusion ring. The first internal thread locking sleeve is snap-fitted to the first locking pad through the first snap-fit ​​protrusion ring. The top side wall of the first locking pad is provided with a locking part with a wedge-shaped cross section. The bottom outer side wall of the first locking pad is provided with a first annular groove. The bottom of the first locking pad is snap-fitted to the first snap-fit ​​protrusion ring through the first annular groove. The wedge-shaped locking part of the first locking pad can be retractably and abutted against the first external thread connection part and the third unit tube. The second internal thread locking sleeve has an internal thread on its top inner sidewall that matches the second external thread connection part. The second internal thread locking sleeve has a second snap-fit ​​protrusion on its bottom inner sidewall. The second internal thread locking sleeve is snap-fitted to the second locking pad through the second snap-fit ​​protrusion. The second locking pad has a wedge-shaped locking part on its top sidewall. The second locking pad has a second annular groove on its bottom outer sidewall. The bottom of the second locking pad is snap-fitted to the second snap-fit ​​protrusion through the second annular groove. The wedge-shaped locking part of the second locking pad is retractably and abuts against the second external thread connection part and the second unit tube.

3. The quick-locking and unlocking telescopic pipe set according to claim 2, wherein, The inner wall of the first external threaded connection is provided with a first gradually thickened locking surface, and the inner wall of the second external threaded connection is provided with a second gradually thickened locking surface.

4. The quick-locking and unlocking telescopic pipe set according to claim 2, wherein, The inner wall of the first unit tube is provided with a first guide protrusion along the axial direction. The top side wall of the second unit tube is provided with a pair of first connecting through holes. The top outer side wall of the second unit tube is provided with a first limiting washer. The inner side wall of the first limiting washer is provided with a first limiting boss that matches the first connecting through hole. The side wall of the first limiting washer is provided with a first guide groove that matches the first guide protrusion. The bottom of the first limiting washer is provided with a sleeve connecting groove.

5. The quick-locking and unlocking telescopic pipe set according to claim 4, wherein, The first limiting pad ring is a set of opposing ring pieces, and the top inner sidewall of the first limiting pad ring is provided with a first positioning protrusion ring.

6. The quick-locking and unlocking telescopic pipe set according to claim 2, wherein, The inner wall of the second unit tube is provided with a second guide protrusion along the axial direction. The top side wall of the third unit tube is provided with a pair of second connecting through holes. The top outer side wall of the third unit tube is provided with a second limiting washer. The inner side wall of the second limiting washer is provided with a second limiting boss that matches the second connecting through holes. The side wall of the second limiting washer is provided with a second guide groove that matches the second guide protrusion.

7. The quick-locking and unlocking telescopic pipe set according to claim 6, wherein, The second limiting pad ring is a set of opposing ring pieces, and the top inner sidewall of the second limiting pad ring is provided with a second positioning protrusion ring.

8. The quick-locking and unlocking telescopic tube set according to claim 1, wherein, The top of the first internal threaded locking sleeve is provided with a threaded fixing through hole, and a fixing screw is connected to the internal thread of the threaded fixing through hole. The first internal threaded locking sleeve is fixedly connected to the outer sleeve by the fixing screw through compression.

9. The quick-locking and unlocking telescopic pipe set according to claim 1, wherein, The outer wall of the second internal thread locking sleeve is provided with an axial anti-slip strip.

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