Telescopic rod and supporting frame

Abstract

The utility model relates to a telescopic rod and a support frame, the telescopic rod comprises a first rod and a second rod inserted in the first rod, the second rod can reciprocate along the length direction of the first rod relative to the first rod, and the second rod can rotate and lock in the circumferential direction relative to the first rod. A locking sleeve allowing the second rod to penetrate through is arranged at an upper end opening of the first rod, at least one section of eccentric curved surface is constructed on the outer wall surface of the second rod in the circumferential direction of the second rod, and an eccentric joint part in locking fit with the eccentric curved surface on the outer wall surface of the second rod is arranged on the inner edge of the locking sleeve; and in the rotating process of the second rod relative to the first rod, the eccentric curved surface of the second rod and the eccentric joint part of the locking sleeve can be mutually extruded and matched so as to realize rotary locking of the second rod. The locking structure has the advantages that the locking structure between the two rod bodies capable of being telescopically adjusted can be effectively simplified, and the assembling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to telescopic rod technical field especially, it relates to a telescopic rod and support frame. BACKGROUND

[0002] Telescopic rods are widely used in various fields, such as tripods, mop rods, trekking poles, walking sticks, table legs, bed legs, etc. Telescopic rods are generally two or more rod-shaped pieces that are connected together by sliding and telescoping. Each adjacent two rod-shaped pieces are locked by a locking structure to achieve length adjustment.

[0003] Traditional telescopic rods are mainly locked by elastic members. They mainly rely on the quality stability of elastic members. For example, the Chinese utility model patent with publication number CN210461301U discloses a convenient telescopic rod. The convenient telescopic rod is provided with a locking mechanism between two adjacent sub-pipes. The locking mechanism uses the force of a return spring to make the steel ball and the inclined surface on the steel sleeve generate pressure on the inner wall of the large pipe, thereby achieving the function of locking the two pipe sections. The locking mechanism mainly relies on the elastic force of the return spring for locking, and the structure is complex and inconvenient to assemble.

[0004] Therefore, the Chinese invention patent application CN118482079A discloses a stepless adjustment telescopic rod, which includes a first telescopic rod and a second telescopic rod that are inserted and telescopingly connected, a locking mechanism for locking the first telescopic rod and the second telescopic rod, the locking mechanism includes a sliding frame that can only slide along the length direction and is arranged in the first telescopic rod, a driving end fixed to the end of the second telescopic rod, the sliding frame and the driving end are screwedly connected along the center line direction of the telescopic rod, one of the sliding frame and the driving end is movably provided with at least two expansion blocks with a side surface corresponding to the inner wall of the first telescopic rod, and the other is fixed with at least two eccentric gear teeth corresponding to the other side surface of the expansion blocks. By rotating the first telescopic rod and the second telescopic rod relative to each other, the sliding frame and the driving end screw, and the radial most convex position of the eccentric gear teeth corresponds to the expansion blocks, so that the expansion blocks expand radially and tend to be tightly interfered with the inner wall of the first telescopic rod; the radial lowest position of the eccentric gear teeth corresponds to the expansion blocks, so that the expansion blocks collapse radially and tend to be separated from the interference with the inner wall of the first telescopic rod, thereby achieving the unlocking of the locking mechanism. The structure is simple, convenient to assemble and easy to operate.

[0005] However, the telescopic rod in the above patent application CN118482079A still has certain deficiencies. The locking mechanism between the two telescopic rods is too complex in structure. The sliding frame of the locking mechanism needs to be assembled into the interior of the first telescopic rod and needs to be ensured to only move in the length direction without deflection. The driving end matched therewith needs to be fixed on the second telescopic rod. The two are eccentrically matched through the expansion block and the eccentric gear. This locking mechanism involves more components. The assembly requirements of each component are relatively high. For example, the expansion block needs to be radially movably arranged. The eccentric gear needs to be fixed on another component. This results in a complicated assembly process and greatly increased production cost.

[0006] Therefore, the existing telescopic rod still needs to be further improved. Content of the utility model

[0007] The first technical problem to be solved by the utility model is to provide a telescopic rod capable of effectively simplifying the locking structure between two rod bodies of telescopic adjustment and improving assembly efficiency in view of the status of the prior art.

[0008] The first technical problem to be solved by the utility model is to provide a support frame applying the telescopic rod.

[0009] The technical scheme adopted by the utility model for solving the first technical problem is as follows: a telescopic rod comprises a first rod and a second rod inserted into the first rod. The second rod can reciprocally move along the length direction of the first rod and can be rotationally locked in the circumferential direction relative to the first rod. The upper end of the first rod is provided with a locking sleeve through which the second rod passes. At least one eccentric curved surface is constructed on the outer wall surface of the second rod in the circumferential direction of the second rod. The inner edge of the locking sleeve has an eccentric joint part matched with the eccentric curved surface on the outer wall surface of the second rod. During the rotation of the second rod relative to the first rod, the eccentric curved surface of the second rod and the eccentric joint part of the locking sleeve can be mutually extruded and matched to realize the rotational locking of the second rod.

[0010] As an improvement, the distance from the eccentric curve to the central axis of the second rod is recorded as a first distance, and the direction in which the second rod is rotationally locked in the circumferential direction relative to the first rod is recorded as a first direction. Along the first direction, the first distance gradually increases from one side of the eccentric curve to the other side. The inner edge of the locking sleeve is configured to have at least one eccentric engagement portion that is locked with the corresponding eccentric curve in the circumferential direction of the locking sleeve. The distance from the eccentric engagement portion to the central axis of the locking sleeve is recorded as a second distance. Along the first direction, the second distance gradually decreases from one side of the eccentric engagement portion to the other side. During the rotation of the second rod in the first direction, the contact surface between the eccentric curve of the second rod and the eccentric engagement portion of the locking sleeve is radially pressed against each other to achieve locking.

[0011] The eccentric curve and the eccentric engagement portion described above can both adopt a curve structure in the form of an involute.

[0012] Generally, there can be only one eccentric curve on the outer wall surface of the second rod, but considering the problem of stress concentration and insufficient locking stability caused by a single locking point, there are at least two eccentric curves arranged in sequence in the circumferential direction on the outer wall surface of the second rod. Each eccentric curve is rotationally symmetrically arranged relative to the central axis of the second rod. Correspondingly, there are at least two eccentric engagement portions arranged in sequence in the circumferential direction on the inner edge of the locking sleeve. Each eccentric engagement portion is also rotationally symmetrically arranged relative to the central axis of the locking sleeve. The arrangement of multiple rotationally symmetric eccentric curves and eccentric engagement portions uniformly distributes the locking force between the second rod and the first rod (i.e., the locking sleeve), thereby improving the structural strength and stability.

[0013] Considering that a lack of limiting position when the telescopic rod is unlocked and rotated can cause excessive rotation and damage the structure, and there is also a lack of corresponding operation feel prompts, a first limiting step is formed at a position corresponding to the area where the two adjacent eccentric curves on the outer wall surface of the second rod meet. A second limiting step is formed at a position corresponding to the area where the two adjacent eccentric engagement portions on the inner edge of the locking sleeve meet. The direction in which the second rod is rotationally unlocked in the circumferential direction relative to the first rod is recorded as a second direction, which is opposite to the first direction. During the unlocking rotation of the second rod, the second limiting step of the locking sleeve can abut against the first limiting step of the second rod, thereby limiting the limit position of the second rod in the second direction. Limiting the rotation limit position of the telescopic rod by the limiting step can prevent misoperation, prolong the service life, and improve the operation feel when the user rotates to the correct position.

[0014] In order to facilitate the insertion and assembly of the first rod and the second rod, and avoid the interference caused by the locking sleeve, the locking sleeve is detachably connected to the port of the first rod, and the inner side of the locking sleeve further has a limiting protruding edge protruding radially inwardly, and the eccentric joint is arranged on the inner edge of the limiting protruding edge.

[0015] As an improvement, the bottom end of the second rod further has a limiting stop portion protruding outwardly relative to the main body of the second rod, and the limiting stop portion is limited in the axial direction by the limiting protruding edge of the locking sleeve, so as to limit the second rod from being pulled out of the first rod. The axial cooperation of the limiting stop portion and the limiting protruding edge effectively prevents the second rod from being pulled out of the first rod, and improves the safety.

[0016] In order to ensure the firmness of the connection between the locking sleeve and the first rod, the limiting protruding edge is located at the end position of the locking sleeve, and the limiting protruding edge is further provided with a plug-in slot for inserting the end of the first rod.

[0017] In order to realize the quick plug-in connection between the locking sleeve and the first rod, and ensure the firmness of the connection between the locking sleeve and the first rod, the locking sleeve has an elastic buckle capable of elastically expanding and contracting in the radial direction, the elastic buckle has an inwardly protruding buckle portion, and the wall of the first rod is correspondingly provided with a limiting buckle opening for clamping the buckle portion of the elastic buckle. The elastic buckle of the locking sleeve cooperates with the limiting buckle opening on the first rod to realize quick installation and firm locking, and can realize the limiting of the locking sleeve relative to the first rod in the circumferential and axial directions.

[0018] Considering that a single-point buckle is prone to failure due to uneven force, the locking sleeve has at least two elastic buckles arranged in sequence in the circumferential direction, and the wall of the first rod is also correspondingly provided with at least two limiting buckle openings. The symmetrical arrangement of multiple buckles enhances the uniformity and torsional resistance of the connection between the locking sleeve and the first rod.

[0019] Considering that the locking operation of the telescopic rod is mostly concentrated at the end position of the rod body, that is, the locking is only performed in the fully extended and fully retracted state, an alternative solution is that the eccentric curved surface on the second rod is arranged at both end positions in the length direction of the second rod. Considering that users need to adjust the telescopic rod steplessly in the length direction, another alternative solution is that the eccentric curved surface on the second rod extends from one end to the other end in the length direction of the second rod. This structure design ensures that any position in the length direction of the second rod can be stably locked, and overcomes the problem that the telescopic rod cannot be steplessly adjusted due to insufficient coverage of the eccentric curved surface.

[0020] The utility model solves the technical scheme that the second technical problem adopts: a support frame, including support seat and telescopic link, support seat is connected in the bottom of telescopic link, telescopic link adopts above-mentioned telescopic link, support seat includes the seat body of being connected in the outside of telescopic link and at least three support feet, each support foot is sequentially arranged along the circumference, and all are hinged on seat body, and have the open state of unfolding to telescopic link and the folding state of folding to telescopic link.

[0021] Compared with the prior art, the utility model has the advantages that: the telescopic rod forms a self-locking unit with the eccentric curved surface of the second rod and the eccentric joint of the locking sleeve, and the traditional locking mechanism (such as a bolt, a buckle, etc.) in the telescopic rod is integrated into the geometric characteristics of the rod body. This structural design greatly reduces the number of components of the telescopic rod, replaces the traditional multi-component linkage with a single rotation, greatly simplifies the assembly process, shortens the assembly time, and improves the production efficiency. In the preferred scheme, the two eccentric structures between the second rod and the locking sleeve adopt a reverse gradual curvature design. When rotated by a set angle in the first direction, the radial displacement of the contact surface can generate a relatively large radial locking force, ensuring the locking effect. The use of involute curved surface design makes the contact stress distribution uniform, and still maintains a good locking force after a large number of locking tests, effectively improving the problem of easy failure of traditional telescopic rod locking. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the support frame of the utility model embodiment, and the support seat of the support frame is in the folding state, and the telescopic rod is in the retracted state;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the support frame of the utility model embodiment, and the support seat of the support frame is in the folding state, and part of the telescopic rod is in the extended state;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the support frame of the utility model embodiment, and the support seat of the support frame is in the folding state, and part of the telescopic rod is in the extended state;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the support frame of the utility model embodiment, and the telescopic rod is in the disassembled state;

[0026] Figure 5 It is a sectional view along Figure 2 The sectional view is cut along A-A in the middle, and the support seat is omitted;

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the locking sleeve of the utility model embodiment;

[0028] Figure 7 This is a three-dimensional structural diagram of the locking sleeve from another angle according to an embodiment of the present utility model;

[0029] Figure 8 This is a top view of the locking sleeve according to an embodiment of the present utility model;

[0030] Figure 9 This is a radially cut cross-sectional view of the first rod in an embodiment of the present invention. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0033] Figures 1-9 This illustration shows a preferred embodiment of the telescopic rod of this invention and a support frame using the telescopic rod. The telescopic rod 1 includes at least two rods that are sequentially connected, each rod being a hollow tube (of course, the innermost rod can be a solid structure). Generally, the radial dimensions of each rod of the telescopic rod 1 decrease sequentially from the outside to the inside; that is, when the telescopic rod 1 is fully extended, the radial dimensions of each rod of the telescopic rod 1 decrease sequentially from the bottom to the top. The two rods that are adjacent to each other in the telescopic rod 1 are respectively designated as the first rod 11 and the second rod 12. The second rod 12 is inserted into the first rod 11, can telescopically move along its length, and can be locked by circumferential rotation.

[0034] A locking sleeve 13 is fixed at the top end of the first rod 11, and the inner side of the top of the locking sleeve 13 further has a limiting convex edge 133 protruding radially inward. In order to facilitate the insertion and assembly of the first rod 11 and the second rod 12, the locking sleeve 13 and the first rod 11 are designed to be detachable. When assembling, the locking sleeve 13 can be sleeved on the second rod 12 from top to bottom, then the second rod 12 is inserted into the first rod 11, and then the locking sleeve 13 is fixed at the top end of the first rod 11. In this way, the interference problem caused by the presence of the locking sleeve 13 can be avoided. The bottom end of the second rod 12 is provided with an annular limiting stop portion 123, which can axially cooperate with the limiting convex edge 133 of the locking sleeve 13 to prevent the second rod 12 from coming out. The limiting stop portion 123 of the second rod 12 can be formed by radially expanding the bottom end of the first rod 11.

[0035] Referring to Figures 5-9 , the inner edge of the limiting convex edge 133 is processed with two eccentric engaging parts 131 which are rotationally symmetrical. The outer wall of the second rod 12 is correspondingly provided with two eccentric curved surfaces 121 which are rotationally symmetrical, and the curvature radius of the eccentric curved surface 121 gradually changes along the circumferential direction. Specifically, the distance (first distance L1) between any point on the eccentric curved surface 121 of the second rod 12 and the center axis of the second rod 12 gradually increases along the locking direction (first direction S1), while the distance (second distance L2) between the eccentric engaging part 131 of the locking sleeve 13 and the center axis of the locking sleeve 13 gradually decreases along the same direction. The above-mentioned eccentric curved surface 121 and eccentric engaging part are both curved surface structures in the form of involute. When the second rod 12 rotates along the first direction, the contact surfaces of the two eccentric curved surfaces 121 of the second rod 12 and the two eccentric engaging parts 131 of the locking sleeve 13 are radially extruded, generating a self-locking force to achieve locking; when the second rod 12 rotates along the second direction S2, the contact surfaces gradually separate, releasing the locking.

[0036] Referring to Figure 8 and Figure 9 , the position of the region where the two adjacent eccentric curved surfaces 121 of the second rod 12 connect with each other corresponds to the formation of a first limiting step 122, and the position of the region where the two adjacent eccentric engaging parts of the inner edge of the locking sleeve 13 connect with each other corresponds to the formation of a second limiting step 132. During the unlocking rotation (i.e., rotation along the second direction) of the second rod 12, the second limiting step 132 of the locking sleeve 13 can abut against the first limiting step 122 of the second rod 12, thereby limiting the limit position of the rotation of the second rod 12 in the second direction. By limiting the rotation limit position of the telescopic rod 1 through the limiting step, it can prevent misoperation, prolong the service life, and improve the operation feeling of the user when the rotation is in place.

[0037] The limiting protrusion 133 of the locking sleeve 13 is located at the top of the locking sleeve 13, and the limiting protrusion 133 is further provided with a plug-in groove 130 for inserting the end of the first rod 11 from bottom to top. The locking sleeve 13 is further connected with the first rod 11 through two symmetrical elastic buckles 134. The two elastic buckles 134 are arranged at the bottom port of the locking sleeve 13, specifically, a strip-shaped gap can be formed side by side on the wall of the locking sleeve 13, and the strip-shaped gap extends downward to the bottom edge of the locking sleeve 13, thereby the part of the wall of the locking sleeve 13 between the two strip-shaped gaps constitutes an elastic buckle 134 capable of elastically expanding and contracting in the radial direction, which will be described in detail in Figure 7 . The elastic buckle 134 has an inwardly protruding buckle portion 1340, and the bottom of the buckle portion 1340 is provided with a corresponding guide slope. The wall of the top port of the first rod 11 is provided with two symmetrical limiting sockets 110. When the locking sleeve 13 is installed, the top port of the first rod 11 is inserted into the plug-in groove 130 of the locking sleeve 13, and after being inserted in place, the buckle portion 1340 of the elastic buckle 134 of the locking sleeve 13 is correspondingly embedded into the limiting socket 110 of the first rod 11, achieving quick installation. After the buckle portion 1340 of the elastic buckle 134 of the locking sleeve 13 is inserted into the limiting socket 110 of the first rod 11, the two can be limited in the circumferential and axial directions, thereby realizing the fixation of the locking sleeve 13 relative to the first rod 11.

[0038] The two eccentric curved surfaces 121 of the second rod 12 of the embodiment extend from the top end to the bottom end along the length direction of the second rod 12, so that the second rod 12 can be rotated and locked at any length position, achieving stepless adjustment.

[0039] It can be understood that when the telescopic rod 1 is composed of three or more rod bodies, the outer wall surface of each rod body (of course, the outermost rod body can be excluded) needs to be provided with a corresponding eccentric curved surface 121, so that the rotation locking and reverse unlocking operation can be realized between any two adjacent rod bodies.

[0040] The telescopic rod 1 of the embodiment forms a self-locking unit through the eccentric curved surface 121 of the second rod 12 and the eccentric engaging part 131 of the locking sleeve 13, and integrates the separate locking mechanism (such as a bolt, a buckle, etc.) in the conventional telescopic rod 1 into the geometric characteristics of the rod body itself. This structural design greatly reduces the number of components of the telescopic rod 1, replaces the conventional multi-component linkage with a single rotation action, greatly simplifies the assembly process, shortens the assembly time, and improves the production efficiency. On the other hand, the two eccentric structures adopted between the second rod 12 and the locking sleeve 13 adopt a reverse gradual change curvature design. When rotating by a set angle in the first direction, the change in the radial displacement of the contact surface can generate a relatively large radial locking force, which ensures the locking effect. The unique involute curved surface design makes the contact stress distribution uniform, and still maintains a good locking force after a large number of locking tests, effectively improving the problem of easy failure of the conventional telescopic rod 1.

[0041] The embodiment also relates to a support frame, which comprises the telescopic rod 1 and a support base 2. The support base 2 comprises a base body 21 and support legs 22. The base body 21 is sleeved and connected to the bottom of the outermost rod body of the telescopic rod 1, and is a circular seat with an extension plane substantially perpendicular to the telescopic rod 1. The base body 21 and the outermost rod body can also be locked by a rotary locking structure, and the base body 21 is sequentially hinged with three support legs 22 in the circumferential direction. Specifically, the upper parts of the three support legs 22 are rotationally connected to the base body 21 by pin shafts. The three support legs 22 can be unfolded to an open state or folded to a parallel state with the telescopic rod 1 about the pin shafts of the upper parts. In use, the length of the telescopic rod 1 is adjusted after the second rod 12 is unlocked and rotated again, and then locked; and the stable triangular support structure is formed after the support legs 22 are unfolded.

[0042] On the basis of the above embodiment, other embodiments can be obtained by replacing and improving the related technical features. For example, the eccentric curved surface 121 of the second rod 12 is only arranged at the two end positions in the length direction, which is suitable for the scene that needs to be locked at a specific length (such as fully extended or retracted). For another example, the locking sleeve 13 can also be fixed with the first rod 11 in a threaded connection, radial screwing or other ways. Of course, the locking sleeve 13 can be designed integrally with the first rod 11 (such as by integral molding), that is, the end part of the first rod 11 serves as the locking sleeve 13, and the corresponding limiting boss and eccentric engaging part 131 are constructed at the end of the first rod 11.

Claims

1. A telescopic rod comprising a first rod (11) and a second rod (12) inserted in the first rod (11), the second rod (12) being able to reciprocate along the length of the first rod (11) relative to the first rod (11) and the second rod (12) being able to rotate relative to the first rod (11) in the circumferential direction and be locked, characterized in that: The upper end of the first rod (11) is provided with a locking sleeve (13) for the second rod (12) to pass through, and at least one eccentric curved surface (121) is formed on the outer wall surface of the second rod (12) in the circumferential direction of the second rod (12). The inner edge of the locking sleeve (13) has an eccentric engaging portion (131) that is locked with the eccentric curved surface (121) on the outer wall surface of the second rod (12). During the rotation of the second rod (12) relative to the first rod (11), the eccentric curved surface (121) of the second rod (12) and the eccentric engaging portion (131) of the locking sleeve (13) can be extruded and matched with each other to achieve the rotational locking of the second rod (12). ​ 2. A telescopic pole according to claim 1, characterised in that: The distance from the eccentric curved surface (121) to the central axis of the second rod (12) is denoted as a first distance (L1), and the direction in which the second rod (12) is rotationally locked relative to the first rod (11) in the circumferential direction is denoted as a first direction. Along the first direction, the first distance (L1) gradually increases from one side of the eccentric curved surface (121) to the other side, and the inner edge of the locking sleeve (13) is formed with at least one eccentric engaging portion (131) that is locked with the corresponding eccentric curved surface (121) in the circumferential direction of the locking sleeve (13). The distance from the eccentric engaging portion (131) to the central axis of the locking sleeve (13) is denoted as a second distance (L2). Along the first direction, the second distance (L2) gradually decreases from one side of the eccentric engaging portion (131) to the other side. During the rotation of the second rod (12) in the first direction, the two contact surfaces between the eccentric curved surface (121) of the second rod (12) and the eccentric engaging portion (131) of the locking sleeve (13) are extruded in the radial direction to achieve locking.

3. A telescopic pole according to claim 2, characterised in that: The outer wall surface of the second rod (12) has at least two eccentric curved surfaces (121) arranged in sequence in the circumferential direction, and each eccentric curved surface (121) is rotationally symmetrically arranged relative to the central axis of the second rod (12). Correspondingly, the inner edge of the locking sleeve (13) also has at least two eccentric engaging portions arranged in sequence in the circumferential direction, and each eccentric engaging portion (131) is also rotationally symmetrically arranged relative to the central axis of the locking sleeve (13).

4. A telescopic pole according to claim 3, characterised in that: The position of the region where the two adjacent eccentric curved surfaces (121) of the second rod (12) are connected corresponds to the formation of a first limiting step (122), and the position of the region where the two adjacent eccentric engaging portions of the locking sleeve (13) are connected corresponds to the formation of a second limiting step (132). The direction in which the second rod (12) is rotationally unlocked relative to the first rod (11) in the circumferential direction is denoted as a second direction, which is opposite to the first direction. During the unlocking rotation of the second rod (12), the second limiting step (132) of the locking sleeve (13) can abut against the first limiting step (122) of the second rod (12), thereby limiting the limit position of the second rod (12) in the second direction.

5. Telescopic pole according to any of claims 1-4, characterized in that: The locking sleeve (13) is detachably connected to the upper end of the first rod (11), and the inner side of the locking sleeve (13) further has a limiting protrusion (133) protruding radially inward, and the eccentric joint (131) is arranged on the inner edge of the limiting protrusion (133).

6. A telescopic pole according to claim 5, characterised in that: The bottom end of the second rod (12) further has a limiting stop (123) protruding outward relative to the main body of the second rod (12), and the limiting stop (123) and the limiting protrusion (133) of the locking sleeve (13) are limited in the axial direction to limit the second rod (12) from being pulled out of the first rod (11).

7. The telescopic pole of claim 5, wherein: The limiting protrusion (133) is located at the end position of the locking sleeve (13), and the limiting protrusion (133) is further provided with a plug-in groove (130) for inserting the end of the first rod (11) therein.

8. The telescopic pole of claim 5, wherein: The locking sleeve (13) has an elastic buckle (134) capable of being elastically expanded and contracted in the radial direction, and the elastic buckle (134) has a buckle portion (1340) protruding inward, and the wall of the first rod (11) is correspondingly provided with a limiting buckle opening (110) for buckling the buckle portion (1340) of the elastic buckle (134) therein.

9. Telescopic pole according to any of claims 1-4, characterized in that: The eccentric curved surface (121) on the second rod (12) is arranged at both end positions in the length direction of the second rod (12); or the eccentric curved surface (121) on the second rod (12) extends from one end to the other end in the length direction of the second rod (12).

10. A support stand comprising a support base (2) connected at the bottom of an extendable pole, characterized in that: The telescopic rod adopts the telescopic rod according to any one of claims 1-9, the support seat (2) comprises a seat body (21) sleeved and connected outside the telescopic rod and at least three support legs (22), each of the support legs (22) is arranged in sequence in the circumferential direction and is hinged to the seat body (21) and has an unfolded state relative to the telescopic rod and a folded state relative to the telescopic rod.

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