Telescopic rod

Abstract

The telescopic rod comprises an inner pipe and an outer pipe which are sleeved with each other, a locking mechanism is arranged at the joint of the inner pipe and the outer pipe and comprises a first positioning portion and a second positioning portion, the first positioning portion is located in the outer pipe, the second positioning portion is fixedly connected with the inner pipe, and a tubular body is arranged between the first positioning portion and the second positioning portion. One end of the tubular body is connected to the first positioning portion, the other end of the tubular body is connected to the second positioning portion, an axial sliding groove is formed in the peripheral wall of the tubular body, an axial center hole communicated with the sliding groove is formed in the center of the tubular body, an elastic piece is matched in the sliding groove, the bottom of the elastic piece is in sliding fit with the sliding groove, and the top of the elastic piece is close to the inner wall of the outer tube. The tubular body is sleeved with downward pressing sleeves and springs, the downward pressing sleeves are located on the two sides of the elastic piece respectively, one end of each spring abuts against the second positioning part, the other end of each spring abuts against the elastic piece, and a pull rope is connected to the center of each downward pressing sleeve. Relative sliding of the outer pipe and the inner pipe is achieved, and the structure is simple and stable.

Description

Technical Field

[0001] This utility model relates to the field of telescopic pole technology, and in particular to a telescopic pole. Background Technology

[0002] Manual telescopic rods have a wide range of applications, such as curtain rods and door curtain rods. Two rod-shaped components are interlocked and slide relative to each other. A locking mechanism is provided between the two rod-shaped components. When the two rod-shaped components extend or retract relative to each other, they are locked by the locking mechanism, thereby realizing the telescopic function of the telescopic rod. For example, Chinese utility model patent (CN208951048U) discloses a locking structure for a telescopic rod body, which sets a connecting locking sleeve at the connection between the outer tube and the inner tube and locks it by installing bolts. The structure is relatively complex, and the external locking structure affects the overall integrity of the telescopic rod. Utility Model Content

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

[0004] This utility model designs a telescopic rod, including an inner tube and an outer tube nested together. A locking mechanism is provided at the connection between the inner and outer tubes. The locking mechanism includes a positioning part one and a positioning part two. Positioning part one is located inside the outer tube, and positioning part two is fixedly connected to the inner tube. A tubular body is provided between positioning part one and positioning part two. One end of the tubular body is connected to positioning part one, and the other end is connected to positioning part two. An axial sliding groove is formed on the outer peripheral wall of the tubular body. A central hole communicating with the sliding groove and axially extending from the center of the tubular body is formed in the center of the tubular body. An elastic plate fits inside the sliding groove. The bottom of the elastic plate slides in contact with the sliding groove, and the top of the elastic plate is close to the inner wall of the outer tube. A pressure sleeve and a spring are fitted around the tubular body. The pressure sleeve is located on both sides of the elastic plate. One end of the spring abuts against positioning part two, and the other end... The lower pressure sleeve has a pull rope connected to its center, with the other end of the pull rope passing through the central hole and extending towards the inner tube in the direction of the spring. When the pull rope is in a relaxed state, the elastic sheet will abut against the positioning part two under the action of the spring force and deform outward under the compression of the spring. As a result, the top end of the elastic sheet will press tightly against the inner wall of the outer tube to lock the tubular body with the outer tube, thereby locking the outer tube and the inner tube. At this time, there will be no relative axial displacement between the outer tube and the inner tube. When the pull rope pulls the lower pressure sleeve, the lower pressure sleeve will drive the elastic sheet to squeeze the spring and slide axially in the direction of spring compression. The elastic sheet will recover its deformation without being squeezed by the spring force, thereby separating the top end of the elastic sheet from the inner wall of the outer tube, thereby releasing the lock between the outer tube and the inner tube. At this time, there can be relative axial displacement between the outer tube and the inner tube.

[0005] Preferably, one end of the second positioning part has an axial mounting cavity, the port of the mounting cavity facing the first positioning part is open, one end of the spring abuts against the bottom surface of the second positioning part, and the opening of the mounting cavity extends to the other end near the spring.

[0006] Preferably, the tubular body is fitted with a plastic gasket between the spring and the elastic plate; the tubular body is fitted with a wear-resistant gasket between the lower pressure sleeve and the elastic plate.

[0007] Preferably, there are multiple sliding grooves, which are distributed in a ring array along the outer periphery of the tubular body, and the elastic sheet and the sliding groove are matched one-to-one.

[0008] Further optimization involves the elastic sheet being a metal sheet with elastic deformation, comprising a base and a spring sheet, wherein the base is slidably engaged with a sliding groove, the spring sheet is integral with the base and is inclined toward the direction of the positioning part, and a plurality of spring sheets are arranged radially along the tubular body.

[0009] Further optimization involves the outer wall of the second positioning part comprising a first segment and a second segment along the axial direction. The first segment is close to the direction of the elastic sheet, and the outer diameter of the second segment is smaller than that of the first segment, thereby forming a stepped peripheral wall between the first segment and the second segment. One end of the inner tube is fitted onto the second segment, so that the outer wall of the inner tube is flush with the outer wall of the first segment.

[0010] Further optimization involves providing a guide groove on the inner wall of the outer tube that slides into contact with the top of the spring piece.

[0011] Further optimization involves the guide groove being an annular groove, with multiple annular grooves distributed parallel and at intervals along the axial direction of the outer tube.

[0012] Further optimization involves setting the guide grooves and spring pieces in a one-to-one correspondence, with the guide grooves distributed in a straight line along the axial direction of the outer tube.

[0013] Further optimization involves setting the guide grooves and spring pieces in a one-to-one correspondence, with the guide grooves distributed in a spiral shape along the axial direction of the outer tube.

[0014] The technical effect of this utility model is that the inner tube and the outer tube are nested together, and a locking mechanism is provided between the inner tube and the outer tube. The locking mechanism includes two positioning parts. A tubular body is provided between the positioning part one and the positioning part two. An axial groove is provided on the outer peripheral wall of the tubular body. An elastic plate is slidably fitted in the groove. A lower pressure sleeve is provided on the outer sleeve of the tubular body. A pull rope is connected to the bottom of the lower pressure sleeve. The pull rope passes through the tubular body axially and extends to the inner tube. A spring is provided between the elastic plate and the positioning part two. The elastic plate is pressed against the positioning part one under the action of the spring. At this time, the elastic plate is deformed under the compression of the spring. Then, the top of the elastic plate is pressed tightly against the inner wall of the outer tube so that the positioning part two and the outer tube are locked together. In this way, the outer tube and the inner tube are locked together. At this time, there will be no relative axial displacement between the outer tube and the inner tube.

[0015] When the pull rope pulls the lower pressure sleeve, the lower pressure sleeve causes the elastic plate to slide, compressing the spring and causing the elastic plate to slide in the direction of spring compression. When the elastic plate is no longer compressed by the spring, it returns to its original position, causing the tip of the elastic plate to separate from the inner wall of the outer tube. This releases the lock between the outer and inner tubes, allowing relative axial displacement between them. Therefore, locking can be achieved at any position after the inner and outer tubes have contracted or extended. This design is not only simple in structure and requires minimal processing of the pipe fittings, but also provides a very stable lock.

[0016] The inner wall of the outer tube is provided with a guide groove, and the elastic sheet can be inserted into the guide groove so that when the outer tube expands or contracts relative to the inner tube, the elastic sheet can move along the guide groove. That is, the guide groove plays a guiding and limiting role for the elastic sheet, making the deformation of the elastic sheet more stable. Attached Figure Description

[0017] Figure 1 This is an overall structural diagram of the present invention;

[0018] Figure 2 This is an exploded view of the overall structure of this utility model;

[0019] Figure 3 This is an exploded view of the slide and elastic sheet structure;

[0020] Figure 4 This is a cross-sectional view of the locking mechanism in the locked state in this utility model;

[0021] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0022] Figure 6 This is a cross-sectional view of the locking mechanism when the guide groove is spiral-shaped;

[0023] Figure 7 yes Figure 6 Enlarged view at point B in the middle;

[0024] Figure 8It is a cross-sectional view of the spiral guide groove;

[0025] Figure 9 This is a top view of a straight guide groove;

[0026] Figure 10 It is a cross-sectional view of a guide groove in the shape of an annular groove.

[0027] In the diagram: 1. Inner tube; 2. Outer tube; 3. Positioning part one; 4. Positioning part two; 41. First segment; 42. Second segment; 5. Tubular body; 51. Slide groove; 52. Center hole; 6. Elastic sheet; 61. Base; 62. Spring sheet; 7. Lower pressure sleeve; 8. Spring; 9. Pull rope; 10. Mounting cavity; 11. Plastic gasket; 12. Wear-resistant gasket; 13. Button; 14. Guide groove. 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0029] This utility model includes an inner tube 1 and an outer tube 2 that are nested together. The outer tube 2 is fitted onto the inner tube 1, and the outer tube 2 and the inner tube 1 are essentially fitted together at both ends. Most of the outer tube 2 and the inner tube 1 are exposed. A locking mechanism is provided at the connection between the inner tube 1 and the outer tube 2. The locking mechanism is used to lock and release the sliding between the inner tube 1 and the outer tube 2, thereby realizing the adjustment of the relative position between the outer tube 2 and the inner tube 1.

[0030] The locking mechanism includes a positioning part 3 and a positioning part 4. The positioning part 3 is located inside the outer tube 2, and the positioning part 4 is fixedly connected to the inner tube 1. In this embodiment, both the positioning part 3 and the positioning part 4 are cylindrical bodies, which facilitates installation inside the tube. A tubular body 5 is provided between the positioning part 3 and the positioning part 4. The tubular body 5 is axially arranged, with one end connected to the positioning part 3 and the other end connected to the positioning part 4. The outer diameter of the tubular body 5 is smaller than that of the positioning part 3 and the positioning part 4. An axial groove 51 is provided on the outer peripheral wall of the tubular body 5, and a central hole 52 communicating with the groove 51 and axially arranged is provided at the center of the tubular body 5. An elastic piece 6 is fitted inside the groove 51, and the bottom of the elastic piece 6 slides in cooperation with the groove 51. The elastic plate 6 is a thin plate structure with concave and convex structures on both sides. The inner wall of the sliding groove 51 is correspondingly provided with concave and convex structures. The concave and convex structures form a sliding fit, allowing the elastic plate 6 to slide back and forth along the axial direction of the sliding groove 51, which is the length direction. The top of the elastic plate 6 is close to the inner wall of the outer tube 2 and is used to abut against the inner wall of the outer tube 2. The tubular body 5 is fitted with a lower pressure sleeve 7 and a spring 8. The lower pressure sleeve 7 is located on both sides of the elastic plate 6. One end of the spring 8 abuts against the positioning part 4, and the other end abuts against the elastic plate 6. A pull rope 9 is connected to the center of the lower pressure sleeve 7. The other end of the pull rope 9 passes through the central hole 52 and extends to the inner tube 1 in the direction of the spring 8. By pulling the pull rope 9, the lower pressure sleeve 7 is pulled, causing the lower pressure sleeve 7 to push the elastic plate 6.

[0031] When the pull rope 9 is in the relaxed state, the elastic piece 6 will press against the positioning part 4 under the elastic force of the spring 8 and deform outward under the compression of the spring 8. Then the top of the elastic piece 6 will press against the inner wall of the outer tube 2 to lock the tubular body 5 and the outer tube 2, thereby locking the outer tube 2 and the inner tube 1. At this time, there will be no relative axial displacement between the outer tube 2 and the inner tube 1.

[0032] When the pull rope 9 pulls the lower pressure sleeve 7, the lower pressure sleeve 7 drives the elastic plate 6 to squeeze the spring 8 and slide axially in the compression direction of the spring 8. The elastic plate 6 is no longer squeezed by the spring force of the spring 8 and returns to its deformation. Then the top of the elastic plate 6 separates from the inner wall of the outer tube 2, thereby releasing the lock between the outer tube 2 and the inner tube 1. At this time, the outer tube 2 and the inner tube 1 can be axially displaced relative to each other.

[0033] Of course, a button 13 is provided on the inner tube 1. The pulling end of the pull rope 9 can extend to the outside of the inner tube 1, or it can extend to the inner tube 1 and be linked with the button 13 on the inner tube 1. The pull and release of the pull rope 9 are achieved by pressing the button 13. The linkage structure between the button 13 and the pull rope 9 is a conventional technology and will not be described in detail here.

[0034] Furthermore, one end of the positioning part 2 4 is provided with an axial mounting cavity 10. The mounting cavity 10 is open at one end facing the positioning part 1 3, and the other end is provided with a through hole that allows the pull rope 9 to pass through, or the end of the tubular body 5 passes through the through hole and is fixed, so that one end of the tubular body 5 is connected to the positioning part 2 4, one end of the spring 8 abuts against the bottom surface of the positioning part 2 4, and the opening of the mounting cavity 10 extends to the other end near the spring 8, that is, the depth of the mounting cavity 10 is relatively deep, so that the spring 8 can be hidden in the mounting cavity 10, and the end of the spring 8 that contacts the elastic piece 6 is exposed outside the opening of the mounting cavity 10. In this way, when the spring 8 is compressed and deformed, it can move along the depth direction inside the mounting cavity 10, making the spring 8 work more stably. It should be noted that since the elastic piece 6 only needs to slide a very small distance from abutting the inner wall of the outer tube 2 to separating from the inner wall of the outer tube 2, only a part of the spring 8 needs to be exposed, and the rest of the spring 8 is located inside the mounting cavity 10.

[0035] Furthermore, a plastic gasket 11 is fitted between the spring 8 and the elastic plate 6 in the tubular body 5 to prevent direct friction between the elastic plate 6 and the spring 8. The plastic gasket 11 can also be made of other soft materials to reduce hard friction and increase the service life of the elastic plate 6 and the spring 8.

[0036] Furthermore, there are multiple sliding grooves 51, which are distributed in a ring array along the outer periphery of the tubular body 5. The elastic sheet 6 corresponds to and cooperates with the sliding groove 51. In this embodiment, there are three sliding grooves 51 and three corresponding elastic sheets 6. When the pressing sheet is pulled by the pull rope 9, it can simultaneously push the three elastic sheets 6 to slide.

[0037] Furthermore, the elastic sheet 6 is a metal sheet with elastic deformation, such as stainless steel, which has high strength and a certain elastic deformation capacity, resulting in high overall strength and a more secure locking mechanism.

[0038] Furthermore, the elastic piece 6 includes a base 61 and a spring piece 62. The base 61 is slidably engaged with the slide groove 51, and the spring piece 62 is integral with the base 61. The spring piece 62 is inclined in the direction of the positioning part 3, making the elastic deformation of the elastic piece 6 more obvious.

[0039] Furthermore, multiple spring pieces 62 are arranged radially along the tubular body 5, or the spring pieces 62 are concave arc surfaces. After the multiple spring pieces 62 are arranged radially, they form a bowl shape as a whole, which is conducive to the elastic deformation of the elastic sheet 6.

[0040] Furthermore, a wear-resistant gasket 12 is fitted between the lower pressure sleeve 7 and the elastic sheet 6 in the tubular body 5. The wear-resistant gasket 12 can be a gasket made of rubber, plastic or other materials to prevent friction between the elastic sheet 6 and the lower pressure sleeve 7. At the same time, a wear-resistant gasket 12 can also be provided between the lower pressure sleeve 7 and the end of the positioning part 3. The wear-resistant gasket 12 is fixed to the end face of the positioning part 3 or fitted on the tubular body 5 to prevent friction between the lower pressure sleeve 7 and the positioning part 3.

[0041] Furthermore, the positioning part 3 and the tubular body 5 are detachably connected and can be connected by screws. The purpose of this design is that after the positioning part 3 is separated from the tubular body 5, the elastic sheet 6, the lower pressure sleeve 7 and each gasket can be assembled onto the tubular body 5.

[0042] Furthermore, the outer wall of the positioning part 2 4 includes a first segment 41 and a second segment 42 along the axial direction. The first segment 41 is close to the direction where the elastic sheet 6 is located, and the outer diameter of the second segment 42 is smaller than that of the first segment 41, so that a stepped peripheral wall is formed between the first segment 41 and the second segment 42. One end of the inner tube 1 is sleeved on the second segment 42, so that the outer wall of the inner tube 1 is flush with the outer wall of the first segment 41, so that the outer tube 2 and the inner tube 1 can move smoothly relative to each other.

[0043] Furthermore, the inner wall of the outer tube 2 is provided with a guide groove 14 that slides with the top of the spring piece 62. During the relative movement of the outer tube 2 and the inner tube 1, the top of the spring piece 62 or part of it extends into the guide groove 14 and moves along the guide groove 14. The guide groove 14 plays a guiding and limiting role for the elastic piece 6.

[0044] The guide groove 14 can have various structural forms; three examples are given below:

[0045] In the first type, the guide groove 14 is an annular groove. Multiple annular grooves are parallel and spaced apart along the axial direction of the outer tube 2. When the outer tube 2 and the inner tube 1 are relatively stationary, the elastic piece 6 is deformed under the compression of the spring 8. The tops or parts of the multiple elastic pieces 62 are in the same annular groove. When the length needs to be adjusted, the elastic piece 62 disengages from the annular groove. At this time, the outer tube 2 and the inner tube 1 are unlocked, and relative axial displacement can occur between the outer tube 2 and the inner tube 1, that is, the length can be adjusted. After the adjustment is completed, the elastic piece 6 is deformed under the compression of the spring 8, so that the elastic piece 62 extends into the annular groove at that position, thereby forming a lock to prevent the elastic piece 6 from shifting axially.

[0046] The second type is that the guide groove 14 and the spring piece 62 are arranged in a one-to-one correspondence. The guide groove 14 is distributed in a straight line along the axial direction of the outer tube 2, that is, the straight guide groove 14. In this embodiment, there are three elastic pieces 6, that is, there are three spring pieces 62, and there are three corresponding straight guide grooves 14. They are distributed parallel to each other along the axial direction. The elastic pieces 6 can perform unlocking or locking actions through elastic deformation within the corresponding straight guide groove 14. That is, the elastic pieces 6 can move back and forth along the axial direction of the straight guide groove 14.

[0047] The third type is that the guide groove 14 and the spring piece 62 are arranged in a one-to-one correspondence. The guide groove 14 is distributed in a spiral shape along the axial direction of the outer tube 2. In this embodiment, the three spring pieces 62 correspond to the three spiral guide grooves 14, and the three spring pieces 62 move in a spiral shape in the corresponding spiral guide grooves 14.

[0048] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. Telescopic rod, characterized in that, The utility model provides a locking mechanism of inner tube and outer tube, comprising inner tube (1) and outer tube (2) that are nested each other, locking mechanism is equipped with in the junction of inner tube (1) and outer tube (2), locking mechanism includes locating part one (3) and locating part two (4), locating part one (3) is located in outer tube (2), locating part two (4) is fixedly connected inner tube (1), locating part one (3) is equipped with tubular body (5) with locating part two (4), one end of tubular body (5) is connected in locating part one (3), the other end of tubular body (5) is connected in locating part two (4), the outer circumferential wall of tubular body (5) is equipped with the axial sliding slot (51), the center of tubular body (5) is equipped with the axial center hole (52) with sliding slot (51) intercommunication, sliding slot (51) is equipped with elastic sheet (6) in cooperation, the bottom of elastic sheet (6) is slidably fitted with sliding slot (51), the top of elastic sheet (6) is close to the inner wall of outer tube (2), tubular body (5) is equipped with the pressing sleeve (7) and spring (8) outside, pressing sleeve (7) is located respectively in the both sides of elastic sheet (6), one end of spring (8) is resisted in locating part two (4), the other end is resisted in elastic sheet (6), the central part of pressing sleeve (7) is connected with a pull rope (9), the other end of pull rope (9) passes through center hole (52) and extends to inner tube (1) in the direction of spring (8) located, when the pull rope (9) is in the relaxed state, the elastic sheet (6) is extruded to the locating part two (4) under the elastic force of spring (8) and is deformed outward under the extrusion of spring (8), and the top end of the elastic sheet (6) is tightly abutted against the inner wall of the outer tube (2) to form a locking between the tubular body (5) and the outer tube (2), and the outer tube (2) and the inner tube (1) are locked, and the outer tube (2) and the inner tube (1) cannot be axially displaced relative to each other; when the pull rope (9) pulls the pressing sleeve (7), the pressing sleeve (7) extrudes the spring (8) and slides axially in the compression direction of the spring (8) with the elastic sheet (6), the elastic sheet (6) is not extruded by the elastic force of the spring (8) and restores the deformation, the top end of the elastic sheet (6) is separated from the inner wall of the outer tube (2), and the outer tube (2) and the inner tube (1) are unlocked, and the outer tube (2) and the inner tube (1) can be axially displaced relative to each other.

2. A telescopic pole according to claim 1, characterised in that one end of the locating part two (4) is provided with an axial mounting cavity (10), the port of the mounting cavity (10) towards the locating part one (3) is provided with an opening, one end of the spring (8) is abutted against the bottom surface of the locating part two (4), and the opening of the mounting cavity (10) extends to the other end close to the spring (8).

3. The telescopic pole of claim 1, wherein, the tubular body (5) is sleeved with a plastic gasket (11) between the spring (8) and the elastic sheet (6), and the tubular body (5) is sleeved with a wear-resistant gasket (12) between the pressing sleeve (7) and the elastic sheet (6).

4. The telescopic pole of claim 1, wherein, the number of sliding slots (51) is multiple, and the sliding slots (51) are distributed in a ring array along the outer periphery of the tubular body (5), and the elastic sheet (6) is matched with the sliding slot (51) one by one.

5. A telescopic pole according to claim 4, characterised in that, The elastic sheet (6) is a metal sheet with elastic deformation, comprising a base (61) and elastic sheets (62), the base (61) is in sliding fit with the sliding groove (51), the elastic sheets (62) are integrally arranged with the base (61) and are inclined to the direction of the positioning part one (3), and a plurality of the elastic sheets (62) are radially arranged along the tubular body (5).

6. The telescopic pole of claim 2, wherein, The outer wall of the positioning part two (4) comprises a first segment (41) and a second segment (42) along the axial direction, the first segment (41) is close to the direction of the elastic sheet (6), and the outer diameter of the second segment (42) is smaller than that of the first segment (41), so that a stepped peripheral wall is formed between the first segment (41) and the second segment (42), one end of the inner tube (1) is sleeved on the second segment (42), and the outer wall of the inner tube (1) is flush with the outer wall of the first segment (41).

7. The telescopic pole of claim 5, wherein, The inner wall of the outer tube (2) is provided with a guide groove (14) in sliding fit with the top end of the elastic sheet (62).

8. A telescopic pole according to claim 7, characterised in that, The guide groove (14) is an annular groove, and a plurality of annular grooves are distributed in parallel and at intervals along the axial direction of the outer tube (2).

9. The telescopic pole of claim 7, wherein, The guide groove (14) is one-to-one corresponding to the elastic sheet (62), and the guide groove (14) is distributed in a straight line along the axial direction of the outer tube (2).

10. The telescopic pole of claim 7, wherein, The guide groove (14) is one-to-one corresponding to the elastic sheet (62), and the guide groove (14) is distributed in a spiral along the axial direction of the outer tube (2).

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