Telescopic rod

Abstract

The present invention provides a telescopic rod that allows for fine adjustment of the distance between the inner and outer tubes without causing seizing. [Solution] The device comprises an inner tube 1 and an outer tube 2 connected by a sleeve. A seat 3 is provided at one end of the inner tube located inside the outer tube, and a mounting column 4 is provided at one end of the seat facing the outer tube. An elastic expansion member 6 is sleeve-mounted on the outside of the mounting column, and the elastic expansion member has a plurality of expansion parts 62 distributed in an annular direction. The plurality of expansion parts can contract and expand outward with respect to the axis of the elastic expansion member.

Description

Technical Field

[0001] This utility model relates to the technical field of telescopic rods, particularly to telescopic rods.

Background Art

[0002] Manual telescopic rods are used in a very wide range of applications, such as curtain rods and door curtain rods. Two rod-shaped members are sleeved with each other and configured to be relatively slidable, and a locking mechanism is provided between the two rod-shaped members. After the two rod-shaped members are telescoped or extended relative to each other, they are locked through the locking mechanism to realize the telescopic function of the telescopic rod. For example, the locking structure of the telescopic rod disclosed in the Chinese utility model with the publication number CN208951048U installs a connecting lock sleeve at the connection part of the outer tube and the inner tube and locks it through a mounting bolt. This structure is relatively complex, and the external locking mechanism affects the integrity of the telescopic rod.

Summary of the Invention

[0003] The purpose of this utility model is to design a telescopic rod that solves the drawbacks of the above-mentioned technology.

[0004] The telescopic rod designed in this utility model comprises an inner tube and an outer tube connected to each other by a sleeve. A seat is provided at one end of the inner tube, which is located inside the outer tube, and a mounting column is provided at one end of the seat facing the outer tube. A mounting hole coaxial with the inner tube is provided at the end of the mounting column, and a limiting rod is provided inside the mounting hole. An elastic expansion member, located inside the outer tube, is sleeve-mounted on the outside of the mounting column, and the elastic expansion member is screw-connected to the outer circumference of the mounting column. The elastic expansion member has a plurality of expansion sections distributed in an annular direction, and the plurality of expansion sections can contract and expand outward relative to the axis of the elastic expansion member. The outer walls of the plurality of expansion sections abut against the inner wall of the outer tube, thereby rotating the elastic expansion member and the outer tube together, and a tapered section is sleeve-mounted on the limiting rod. The tapered section is located in the center of the plurality of expansion sections and is movable axially along the limiting rod. One end of the tapered section, which has a small radial dimension, faces the bottom of the elastic expansion member. When the outer tube and inner tube rotate in the forward direction with respect to the axial direction, the outer tube or seat drives the elastic expansion member to rotate, causing the elastic expansion member to rotate relative to the mounting column, thereby enabling the elastic expansion member to move axially toward one end of the tapered section with a larger radial dimension. The tapered section gradually expands until the expansion portion is in close contact with the inner wall of the outer tube, at which point the outer tube and inner tube are locked together, and the elastic member is sleeve-mounted on the limiting rod. The elastic member is positioned between one end of the tapered section with a larger radial dimension and the limiting rod, causing the tapered section to form an axial elastic movement relative to the limiting rod.

[0005] When the inner and outer tubes rotate in opposite directions with respect to the axial direction, the outer tube rotates together with the elastic expansion member, and as the elastic expansion member and the mounting column rotate in opposite directions relative to each other, the elastic expansion member moves axially facing one end of the tapered portion with a smaller radial dimension, the expansion portion of the elastic expansion member gradually contracts inward, the tight contact between the elastic expansion member and the inner wall of the outer tube is released, and at this time the lock between the outer tube and the inner tube is released.

[0006] Preferably, the limiting rod is screw-connected to the mounting hole by providing a female thread inside the mounting hole and a male thread on the limiting rod.

[0007] Preferably, the elastic expansion member comprises a base and an expansion portion connected to the base, and the base has a screw hole for screw connection to a mounting column.

[0008] Preferably, the expanded portion is a block shape made of plastic material, the inner wall of the expanded portion is an arcuate surface that matches the outer wall of the tapered portion, and the expanded portions are distributed with a gap between them.

[0009] Preferably, the elastic member is a spring sleeved and mounted on the limiting rod, with a limiting end formed at one end of the limiting rod facing the outer tube, one end of the spring contacting the limiting end and the other end contacting one end of a tapered portion with a larger radial dimension, and when the spring is in an uncompressed state, the length of the limiting rod in the portion where the spring is located is shorter than the sum of the length of the portion where the tapered portion is located and the length of the portion where the mounting column is located.

[0010] Preferably, the mounting column has threads on its outer circumference, and a stopper is provided at the bottom of the threads located on the mounting column to prevent the base from being screwed and fixed to the mounting column.

[0011] Preferably, the tapered portion is a circular block shape formed by joining two blocks that are divided in half radially, with a semi-perforated structure in each of the two blocks, and when the semi-perforated structures of the two blocks are joined together, a complete circular hole structure is formed, and the tapered portion is sleeve-mounted to the limiting rod through the circular hole structure.

[0012] Preferably, the ends to which the inner tube and outer tube are sleeve-connected are both straight tube sections, and the seat, mounting column, limiting rod, elastic expansion member, tapered section, and elastic member are all located in the corresponding straight tube sections.

[0013] Furthermore, preferably, in the inner and outer tubes, the tube sections other than the straight tube sections may be straight tube sections or bendy tube sections. [Effects of the Invention]

[0014] The technical effect of this utility model is that a seat is provided at the end where the inner tube is inserted into the outer tube, a mounting column is provided on the seat, and an elastic expansion member is sleeve-connected to the mounting column, a tapered portion is provided in the center of the elastic expansion member, and the outer circumferential wall of the tapered portion is formed in a conical structure in which the diameter of one end is larger than the diameter of the other end, creating static friction between the elastic expansion member and the inner wall of the outer tube. When the outer tube rotates axially facing one direction, the outer tube drives the elastic expansion member to rotate, the elastic expansion portion moves axially facing the top of the mounting column, the elastic expansion member contacts the outer wall of the tapered portion and moves along the axial direction of the tapered portion. Because the outer circumferential wall of the tapered portion tends to change gradually, the elastic expansion member gradually expands and comes into close contact with the inner wall of the outer tube. At this time, a state of close contact is formed between the elastic portion and the outer tube, so that the outer tube and the inner tube are locked together. To release the lock, the outer or inner tube is rotated axially so that it faces the other direction, causing the outer tube to rotate the elastic expansion member or the seat to rotate the elastic expansion member axially. When the elastic expansion member moves axially facing the bottom of the tapered section, it gradually contracts, releasing its contact with the inner wall of the outer tube. This allows the inner and outer tubes to be locked at any position even after contraction or expansion, resulting in a simple structure that requires no excessive processing of the tube members, as well as extremely high stability after locking. The elastic member is sleeved on the limiting rod, with one end of the elastic member contacting the end face of the tapered section and the other end contacting one end of the limiting rod. This allows the tapered section to be elastically positioned as it moves axially along the limiting rod. Therefore, even when the elastic expansion member moves and the inner and outer tubes are locked, the tapered section continues to move a certain distance while compressing the elastic member. Because this movement process is relatively gradual, fine adjustments can be made as the inner and outer tubes extend, and the inner and outer tubes do not seize up even when they move a certain distance that allows for fine adjustment. [Brief explanation of the drawing]

[0015] [Figure 1] This is an exploded view showing the overall structure of Example 1. [Figure 2] This is a cross-sectional view showing the overall structure of Example 1. [Figure 3] This figure shows the block structure of Example 1. [Figure 4] This is a cross-sectional view showing the structure when the inner and outer tubes are in an extended state in Example 2. [Figure 5] This is a cross-sectional view showing the structure when the inner and outer tubes are in a contracted state in Example 2. [Modes for carrying out the invention]

[0016] The technical solutions of this utility model are described below clearly and completely with reference to the accompanying drawings in the embodiments of this utility model. Clearly, the embodiments described are not all embodiments, but only a selection of embodiments of this utility model. All other embodiments that a person skilled in the art can obtain based on the embodiments of this utility model are all within the scope of protection of this utility model.

[0017] [Example 1] As shown in Figures 1 and 2, this utility model comprises an inner tube 1 and an outer tube 2 connected to each other by a sleeve. A seat 3 is provided at one end of the inner tube 1 located inside the outer tube 2, and both the inner tube 1 and the outer tube 2 use a cylindrical structure. The seat 3 is a correspondingly cylindrical structure so that it can be inserted into the end of the inner tube 1. A restricting structure is provided between the seat 3 and the inner tube 1 so that the seat 3 is fixed and connected to the inner tube 1. A mounting column 4 is provided on the end face of the seat 3 facing the outer tube 2, and the mounting column 4 is installed integrally with the seat 3, and a mounting hole coaxial with the inner tube 1 is provided at the end of the mounting column 4. A restricting rod 5 is provided inside the mounting hole 41, and the restricting rod 5 is connected to the inside of the mounting hole 41 by a screw connection method, and the restricting rod 5 can be fixed by a method of applying adhesive in spots, thereby preventing the restricting rod 5 from coming off the mounting hole 41, although other general connection methods can of course be used. In other words, the limiting rod 5 needs to be stably mounted inside the mounting hole 41 so that it does not detach from the mounting hole 41 during long-term use. An elastic expansion member 6, located inside the outer tube 2, is sleeve-mounted on the outside of the mounting column 4. The elastic expansion member 6 comprises a base 61 and an expansion part 62 connected to the base 61. The base 61 has screw holes 63 for screw connection to the outer circumference of the mounting column 4.

[0018] Multiple expansion portions 62 are distributed in a ring-shaped arrangement around the elastic expansion member 6, and these multiple expansion portions 62 can simultaneously contract and expand outward along the axis of the elastic expansion member 6. Static friction is generated between the expansion portions 62 and the inner wall of the outer tube 2 as the outer walls of the multiple expansion portions 62 abut against the inner wall of the outer tube 2, and therefore the elastic expansion member 6 can rotate together with the outer tube 2.

[0019] A tapered section 7 is sleeve-mounted on the limiting rod 5, positioned in the center of a plurality of expansion sections 62 and movable along the axial direction of the limiting rod 5. In this embodiment, the tapered section 7 is a block shape of a cone, with a circular hole structure 71 in its center, and the tapered section 7 is sleeve-mounted on the limiting rod 5 via the circular hole structure 71. The outer circumferential wall of the tapered section 7 contacts the inner wall of the outer tube 2, and one end of the tapered section 7, which has a smaller radial dimension, faces the bottom of the elastic expansion member 6. When the outer tube 2 and the inner tube 1 rotate relative to each other, there are two types of rotation. The first rotation is defined as forward rotation, that is, either the outer tube 2 or the inner tube 1 rotates in one direction, and when the outer tube 2 rotates, the outer tube 2 drives the elastic expansion member 6 to rotate together with it, causing the elastic expansion member 6 and the mounting column 4 to rotate relative to each other. As a result, the elastic expansion member 6 moves axially toward one end of the tapered section 7, which has a larger diameter. The tapered section 7 gradually expands the expansion section 62 until it is in close contact with the inner wall of the outer tube 2, at which point the outer tube 2 and the inner tube 1 are locked together. When the inner tube 1 rotates, it drives the seat 3 to rotate, and the elastic expansion member 6 rotates together with the seat 3. Similarly, the elastic expansion member 6 and the mounting column 4 also rotate relative to each other, locking the inner tube 1 and the outer tube 2 together, at which point the distance between the inner tube 1 and the outer tube 2 cannot be adjusted.

[0020] The second type of rotation is defined as reverse rotation, that is, when either the inner tube 1 or the outer tube 2 rotates in the other direction, the outer tube 2 rotates in the opposite direction to the forward rotation, or when the inner tube 1 rotates in the opposite direction and the outer tube 2 rotates together with the elastic expansion member 6, the elastic expansion member 6 rotates in the opposite direction relative to the mounting column 4. As a result, the elastic expansion member 6 moves axially toward one end of the tapered section 7 with a smaller diameter, the expansion portion 62 of the elastic expansion member 6 is gradually contracted inward, and the elastic expansion member 6 is released from its tight contact with the inner wall of the outer tube 2. At this time, the lock between the outer tube 2 and the inner tube 1 is released from each other. At this time, the relative distance between the inner tube 1 and the outer tube 2 can be adjusted, and extension and retraction can be achieved as a telescopic rod.

[0021] An elastic member 10 is installed on the limiting rod 5 in a slip-fit manner. In this embodiment, the elastic member 10 uses a spring, and the spring is installed on the limiting rod 5 in a sleeve manner. A limiting end 51 is formed at one end of the limiting rod 5 facing the outer tube 2. One end of the spring abuts against the limiting end 51, and the other end abuts against one end of the tapered portion 7 with a larger diameter, so that an elastic limit can be formed when the tapered portion 7 moves along the axial direction of the limiting rod 5. The purpose of installing the elastic member 10 is that when the elastic expansion member 6 rotates to the position at one end of the tapered portion 7 with a larger diameter, due to the elastic force of the elastic member 10, the tapered portion 7 is driven by the elastic expansion member 6 and moves a certain distance toward the limiting end 51 of the limiting rod 5. Therefore, a certain buffer path is formed to prevent the tapered portion 7 from directly contacting the limiting end 51 and being completely locked. This formed buffer movement path is used to finely adjust the distance between the outer tube 2 and the inner tube 1. That is, when the outer tube 2 and the inner tube 1 expand and contract relative to each other, they are divided into two expansion and contraction intervals. In the first interval, the elastic expansion member 6 moves along the tapered portion 7 and is gradually expanded by the tapered portion 7 during the movement process until it reaches the maximum angle. As a result, the outer tube 2 adheres to the expansion portion 62, and this process is a coarse adjustment process, that is, the expansion and contraction adjustment is a coarse adjustment. After passing through the first interval, due to the presence of the elastic member 10, the tapered portion 7 continues to move together with the elastic expansion portion 62 while pushing the elastic member 10 in, and moves gently due to the reaction force of the elastic member 10. Therefore, this process is a fine adjustment process, that is, the stage of fine adjustment after the coarse adjustment of the expansion and contraction.

[0022] Also, the elastic member 10 is located between one end of the tapered portion 7 with a larger radial dimension and the limiting rod 5, so that the tapered portion 7 moves elastically in the axial direction with respect to the limiting rod 5.

[0023] Also, an internal thread 43 is provided inside the mounting hole 41, and an external thread 52 is provided on the limiting rod 5, so that the limiting rod 5 is threadedly connected to the mounting hole 41.

[0024] In addition, the extension part 62 is in the shape of a block made of a plastic material. The inner wall of the extension part 62 is an arc surface that conforms to the outer peripheral wall of the tapered part 7. Between adjacent extension parts 62, by being distributed at intervals, the extension part 62 can perform elastic deformation with respect to the base 61 and perform synchronous opening and contraction operations.

[0025] Also, when the spring is in an uncompressed state, the length of the limiting rod 5 at the part where the spring is located is shorter than the total length of the part where the tapered part 7 is located and the part where the mounting column 4 is located. Thereby, the connecting part between the limiting rod 5 and the mounting column 4 becomes longer, and thus, the fixing of the limiting rod 5 becomes more stable, and it is possible to prevent the positional movement of the limiting rod 5 from becoming loose when the elastic rod is compressed.

[0026] In addition, the mounting column 4 is provided with a thread 42 on its outer periphery. In order to prevent the base 61 from being screwed and fixed to the mounting column 4, a stopper part 9 is provided at the bottom of the thread 42 located on the mounting column 4.

[0027] Also, as shown in FIG. 3, the tapered part 7 is formed by joining two blocks 72 whose radial directions are divided in half. Half-hole structures 73 are provided in the two blocks 72. When the half-hole structures 73 of the two blocks 72 are joined, a complete circular hole structure 71 is formed. The tapered part 7 is sleeved on the limiting rod 5 through the circular hole structure 71 and is restricted by the extension part 62, so it does not detach from the extension part 62.

[0028] Of course, between the inner tube 1 and the outer tube 2, a limiting mechanism is provided to prevent the phenomenon that the inner tube 1 and the outer tube 2 are separated by excessively adjusting the relative distance after the locks between them are released from each other.

[0029] In this embodiment, since both the inner tube 1 and the outer tube 2 are linear tube structures, the inner tube 1 and the outer tube 2 can linearly expand and contract.

[0030] [Embodiment 2] The basic structure is the same as in Embodiment 1, the difference being that, as shown in Figures 4 and 5, the inner tube 1 and outer tube 2 may have a curved tubular structure so that a curved expandable tube structure can be formed after the inner tube 1 and outer tube 2 are sleeve-connected to each other. However, the ends of the inner tube 1 and outer tube 2 that are sleeve-connected to each other must both be straight tubular sections 11. The seat 3 is attached to the straight tubular section 11 of the inner tube 1, and the mounting column 4, limiting rod 5, elastic expansion member 6, tapered section 7 and elastic member 10 are all located on the corresponding straight tubular sections 11. In this way, when the inner tube 1 and outer tube 2 expand and contract, reciprocal expansion and contraction is possible only if the ends of the inner tube 1 and outer tube 2 that are sleeve-connected to each other are both straight tubular sections 11. The inner tube 1 and outer tube 2 have a curved tubular structure in the tubular sections other than the straight tubular section 11, thereby realizing a curved expandable tube structure, and the curved expandable tube structure can be used as a curtain rod in corner sections. [Explanation of Symbols]

[0031] 1 Inner tube, 2 Outer tube, 3 Base, 4 Mounting column, 41 Mounting hole, 42 Thread, 43 Female thread, 5 Limiting rod, 51 Limiting end, 52 Male thread, 6 Elastic expansion member, 61 Base, 62 Expansion part, 63 Threaded hole, 7 Tapered part, 71 Circular hole structure, 72 Block, 73 Semi-perforated structure, 9 Stopper part, 10 Elastic member, 11 Straight tube part

Claims

1. It is a telescopic rod, The device comprises an inner tube (1) and an outer tube (2) connected by a sleeve, with a seat (3) provided at one end of the inner tube (1) located inside the outer tube (2), and a mounting column (4) provided at one end of the seat (3) facing the outer tube (2), with a mounting hole (41) coaxial with the inner tube (1) provided at the end of the mounting column (4), with a limiting rod (5) provided inside the mounting hole (41), and an elastic expansion member (6) located inside the outer tube (2) sleeve-mounted on the outside of the mounting column (4). The elastic expansion member (6) is screw-connected to the outer circumference of the mounting column (4), and the elastic expansion member (6) has a plurality of expansion parts (62) distributed in an annular direction, and the plurality of expansion parts (62) can contract and expand outward relative to the axis of the elastic expansion member (6), and the outer walls of the plurality of expansion parts (62) abut against the inner wall of the outer tube (2), thereby rotating the elastic expansion member (6) and the outer tube (2) together, and a tapered part (7) is sleeve-mounted on the limiting rod (5), and the tapered part (7) has a plurality of expansion parts The tapered portion (7), which is located in the center of the section (62) and is movable in the axial direction along the limiting rod (5), has a small radial dimension, and one end of the tapered portion (7) faces the bottom of the elastic expansion member (6). When the outer tube (2) and inner tube (1) rotate in the forward direction with respect to the axial direction, the outer tube (2) or the seat (3) drives the elastic expansion member (6) to rotate, causing the elastic expansion member (6) to rotate relative to the mounting column (4), thereby causing the elastic expansion member (6) to move toward one end of the tapered portion (7), which has a larger radial dimension. The tapered portion (7) is movable in the axial direction, and the tapered portion (7) gradually expands the expanded portion (62) until the expanded portion (62) is in close contact with the inner wall of the outer tube (2). At this time, the outer tube (2) and the inner tube (1) are locked together, and an elastic member (10) is sleeve-mounted on the limiting rod (5). The elastic member (10) is positioned between one end of the tapered portion (7), which has a larger radial dimension, and the limiting rod (5), so that the tapered portion (7) forms an axial elastic movement relative to the limiting rod (5). A telescopic rod characterized in that when the inner tube (1) and the outer tube (2) rotate in opposite directions with respect to the axial direction, the outer tube (2) rotates together with the elastic expansion member (6), and as the elastic expansion member (6) and the mounting column (4) rotate in opposite directions relative to each other, the elastic expansion member (6) moves along its axis facing one end of the tapered portion (7) which has a smaller radial dimension, the expansion portion (62) of the elastic expansion member (6) gradually contracts inward, the tight contact between the elastic expansion member (6) and the inner wall of the outer tube (2) is released, and at this time, the lock between the outer tube (2) and the inner tube (1) is released.

2. The telescopic rod according to claim 1, characterized in that a female screw (43) is provided inside the mounting hole (41) and a male screw (52) is provided on the limiting rod (5), thereby screw-connecting the limiting rod (5) to the mounting hole (41).

3. The telescopic rod according to claim 2, wherein the elastic expansion member (6) comprises a base (61) and an expansion portion (62) connected to the base (61), and the base (61) has a screw hole (63) which is screw-connected to the mounting column (4).

4. The telescopic rod according to claim 3, characterized in that the expansion portion (62) is a block shape made of plastic material, the inner wall of the expansion portion (62) is an arcuate surface that conforms to the outer wall of the tapered portion (7), and adjacent expansion portions (62) are distributed at intervals.

5. The telescopic rod according to the claim, wherein the elastic member (10) is a spring sleeve-mounted on the limiting rod (5), a limiting end (51) is formed at one end of the limiting rod (5) facing the outer tube (2), one end of the spring abuts against the limiting end (51) and the other end abuts against one end of a tapered portion (7) with a larger radial dimension, and when the spring is in an uncompressed state, the length of the limiting rod (5) in the portion where the spring is located is shorter than the sum of the length of the portion where the tapered portion (7) is located and the portion where the mounting column (4) is located.

6. The telescopic rod according to claim 3, characterized in that the mounting column (4) has screw threads (42) on its outer circumference, and a stopper portion (9) is provided at the bottom of the screw threads (42) located on the mounting column (4) to prevent the base (61) from being screwed and fixed to the mounting column (4).

7. The tapered portion (7) is a conical block shape formed by joining two blocks (72) that are divided in half radially, and a semi-perforated structure (73) is provided in the two blocks (72), and when the semi-perforated structures (73) of the two blocks (72) are joined together, a complete circular hole structure (71) is formed, and the tapered portion (7) is sleeve-installed on the limiting rod (5) via the circular hole structure (71), as described in claim 1.

8. The telescopic rod according to claim 1, characterized in that the ends to which the inner tube (1) and the outer tube (2) are sleeve-connected to each other are both straight tube sections (11), and the seat (3), mounting column (4), limiting rod (5), elastic expansion member (6), tapered section (7), and elastic member (10) are all located in the corresponding straight tube sections (11).

9. The telescopic rod according to claim 8, characterized in that, in the inner tube (1) and outer tube (2), the tube sections other than the straight tube section (11) may be straight tube sections or be curved tube sections.

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