Telescopic rod

Abstract

The telescopic rod comprises an inner pipe and an outer pipe which are connected in a sleeved mode, the end portion, stretching into the outer pipe, of the inner pipe serves as a stretching-in end and is provided with a limiting portion, the bottom of the limiting portion is connected with the stretching-in end, the top of the limiting portion is provided with a center positioning piece, and the outer diameter of the peripheral wall of the limiting portion is gradually increased from the bottom to the top. The positioning piece is connected with an elastic part in a sliding mode, so that the elastic part can do reciprocating motion coaxial with the inner pipe along the positioning piece, the elastic part is provided with an elastic opening piece, and static friction is formed between the elastic opening piece and the inner wall of the outer pipe. The locking device is simple in structure, convenient to operate and very stable in locking.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic rods, in particular to a telescopic rod. Background Art

[0002] Manual telescopic rods are widely used, for example, in curtain rods and door curtain rods, where two rod-like members are sleeved on each other and slide relative to each other, and a locking mechanism is provided between the two rod-like members. When the two rod-like members are telescoped or extended relative to each other, they are locked by the locking mechanism, thereby realizing the telescopic function of the telescopic rod. For example, a Chinese utility model patent (CN208951048U) discloses a locking structure for a telescopic rod body, which is achieved by providing a connecting locking sleeve at the connection between the outer surface and the inner tube, and locking the rod body by installing bolts. The structure is relatively complex, and the external locking structure affects the integrity of the telescopic rod. Utility Model Content

[0003] The utility model aims to provide a telescopic rod designed to solve the deficiencies of the above-mentioned technology.

[0004] The utility model provides a telescopic rod, comprising an inner tube and an outer tube which are sleeved with each other, wherein the end of the inner tube extending into the outer tube is provided with a limiting portion as an extending end, the bottom of the limiting portion is connected to the extending end, the top central positioning piece of the limiting portion, the outer diameter of the outer peripheral wall of the limiting portion is gradually increased from the bottom to the top, the positioning piece is slidably connected with an elastic portion, so that the elastic portion can reciprocate along the positioning piece coaxially with the inner tube, the elastic portion has an elastic expansion piece, and the elastic expansion piece forms a static Friction, when the inner tube and the outer tube rotate relative to each other, the static friction between the outer tube and the elastic expansion member drives the elastic part to move along the positioning member toward the limiting part, and the elastic expansion member cooperates with the outer peripheral wall of the limiting part, so that as the elastic part moves toward the limiting part, the elastic expansion member moves along the top of the limiting part to the bottom, and the limiting part gradually expands the elastic expansion member until the elastic expansion member is tightly against the inner wall of the outer tube. At this time, the inner tube and the outer tube are in a mutually locked state, and no relative axial displacement occurs between the inner tube and the outer tube;

[0005] When the inner tube and the outer tube rotate in opposite directions relative to each other, the outer tube drives the elastic part to move along the positioning part toward and away from the limiting part, so that the elastic expansion part of the elastic part moves along the bottom of the limiting part to the top, and the elastic expansion part gradually shrinks, and the elastic expansion part and the inner wall of the outer tube are released from the tight contact state. At this time, the outer tube and the inner tube are in a mutually unlocked state.

[0006] Preferably, the elastic part comprises a base and an elastic expansion member connected to the base, and the base is slidably connected to the positioning member.

[0007] Further optimization, the elastic expansion member is a long strip with a certain elastic deformation ability, a plurality of the long strips are spaced and evenly distributed around the base, and the outer wall shape of the long strip is adapted to the inner wall of the outer tube.

[0008] Further optimization is carried out in which a plurality of spaced and evenly distributed card blocks are provided around the base, a connection is formed between the bottoms of the plurality of elastic support members, a gap is formed between two adjacent elastic support members, and the card blocks are snapped into the gap between the corresponding two adjacent elastic support members to form a limit, so that a rotation limit is formed between the base and the plurality of elastic support members.

[0009] Further optimized, the positioning member is a threaded column, and a threaded hole that slidably cooperates with the threaded column is opened in the center of the base.

[0010] Further optimization is performed in that a through hole is opened in the center of the limiting portion, and the limiting portion is sleeved on the positioning member through the through hole. The positioning member is provided with a first limiting ring at the through hole to prevent the limiting portion from detaching from the positioning member.

[0011] Further optimization is provided in that a second limiting ring is provided at the top of the positioning member to prevent the base from being separated from the positioning member.

[0012] Preferably, the elastic expansion member is made of plastic.

[0013] Preferably, the limiting portion is made of plastic.

[0014] The technical effect of the utility model is that a limiting part is provided at the end of the inner tube extending into the outer tube, and the outer diameter of the outer peripheral wall of the limiting part gradually increases from the bottom to the top, and there is a top central positioning piece of the limiting part, and the positioning piece is a threaded column, on which an elastomer is screwed, and the elastomer has an elastic expansion piece, and static friction is formed between the elastic expansion piece and the inner wall of the outer tube. When the outer tube is rotated, the outer tube will drive the elastic expansion piece to rotate, thereby causing the elastomer to rotate, and the elastomer will reciprocate axially along the positioning piece, i.e. the threaded column. When the elastomer moves toward the limiting part, the elastic expansion piece contacts the outer wall of the limiting part and moves along the limiting part from the top of the limiting part to the bottom of the limiting part. Since the outer diameter of the outer peripheral wall of the limiting part gradually increases from the bottom to the top, the elastic expansion piece is gradually expanded, so that the elastic expansion piece is tightly pressed against the inner wall of the outer tube, and a tight fit is formed between the elastomer and the outer tube. Therefore, the outer tube and the inner tube are locked. When unlocking is required, the outer tube only needs to be rotated in the opposite direction. The outer tube drives the elastic body to rotate. The elastic body moves from the bottom of the limiter to the top along the positioning piece. At this time, the elastic expansion piece gradually closes, and the elastic expansion piece and the inner wall of the outer tube are released from the tight contact state. Therefore, the inner tube and the outer tube can be locked at any position after contraction and extension. Not only is the structure simple, no excessive processing of the tube is required, but also it is very stable after locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall structure diagram of the utility model;

[0016] Figure 2 It is an exploded view of the overall structure of the utility model;

[0017] Figure 3 It is the exploded diagram of the elastic body;

[0018] Figure 4 is the overall picture of the elastic body;

[0019] Figure 5 It is a structural diagram when the elastic body and the limiting part are in the unlocked state;

[0020] Figure 6 This is a structural diagram when the elastic body and the limit part are in a locked state.

[0021] In the figure: 1, inner tube; 11, insertion end; 2, outer tube; 3, limiting part; 4, positioning member; 5, elastic part; 51, elastic expansion member; 52, base; 53, clamping block; 6, first limiting ring; 7, second limiting ring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0023] The utility model comprises an inner tube 1 and an outer tube 2 which are sleeved with each other, that is, one end of the inner tube 1 is inserted into the outer tube 2 as an insertion end 11, and a limiting portion 3 is provided at the insertion end 11 of the inner tube 1, the bottom of the limiting portion 3 is connected to the insertion end 11, and a positioning member 4 is provided at the top, and the outer diameter of the outer peripheral wall of the limiting portion 3 gradually increases from the bottom to the top. In this embodiment, the limiting portion 3 is a truncated cone structure, and an elastic portion 5 is slidably connected to the positioning member 4, so that the elastic portion 5 can reciprocate along the positioning member 4 in the same axis as the inner tube 1, and the elastic portion 5 has an elastic expansion member 51, and the elastic expansion member 51 forms static friction with the inner wall of the outer tube 2, that is, when the outer tube 2 is rotated or axially moved, the outer tube 2 can drive the elastic body to rotate or move axially, that is, the outer tube 2 and the elastic body act synchronously,

[0024] When the inner tube 1 and the outer tube 2 rotate relative to each other, the static friction between the outer tube 2 and the elastic expansion member 51 drives the elastic part 5 to move along the positioning member 4 toward the limiting part 3, and the elastic expansion member 51 cooperates with the outer peripheral wall of the limiting part 3, so that as the elastic part 5 moves toward the limiting part 3, the elastic expansion member 51 moves along the top of the limiting part 3 to the bottom. Since the outer diameter of the outer peripheral wall of the limiting part 3 gradually increases from the bottom to the top,

[0025] As the elastic body continues to move axially, the limiting portion 3 gradually expands the elastic expansion member 51 until the outer wall of the elastic expansion member 51 is tightly against the inner wall of the outer tube 2, so that a tight fit is formed between the elastic expansion member 51 and the inner wall of the outer tube 2. At this time, the inner tube 1 and the outer tube 2 are mutually locked, and no relative axial displacement occurs between the inner tube 1 and the outer tube 2.

[0026] When the inner tube 1 and the outer tube 2 rotate in opposite directions relative to each other, the outer tube 2 drives the elastic part 5 to move along the positioning piece 4 away from the limiting part 3, so that the elastic expansion piece 51 of the elastic part 5 moves along the bottom of the limiting part 3 to the top, and the elastic expansion piece 51 gradually shrinks due to its own elasticity, and the elastic expansion piece 51 and the inner wall of the outer tube 2 are released from the tight fit state. At this time, the outer tube 2 and the inner tube 1 are in a mutually unlocked state. Therefore, the outer tube 2 and the inner tube 1 can move axially with each other after being unlocked, so that the length of the telescopic tube can be adjusted. After the length is adjusted, by rotating the outer tube 2 or the inner tube 1, the outer tube 2 drives the elastomer to move along the positioning piece 4 toward the limiting part 3 through static friction, so that the elastic expansion piece 51 of the elastomer gradually expands along the limiting part 3, and the elastic expansion piece 51 forms a tight fit with the inner wall of the outer tube 2. At this time, the inner tube 1 and the outer tube 2 are in a mutually locked state, and the length adjustment of the telescopic rod is completed.

[0027] Specifically, the elastic part 5 includes a base 52 and an elastic expansion member 51 connected to the base 52, the base 52 is slidably connected to the positioning member 4, the base 52 and the elastic expansion member 51 can be an integrated structure, or a separate structure. In this embodiment, the base 52 and the elastic expansion member 51 are separate structures, the base 52 is an annular seat structure, and the elastic expansion member 51 is a long strip with a certain elastic deformation ability. A plurality of long strips are spaced and evenly distributed around the base 52. The outer wall shape of the long strip is adapted to the inner wall of the outer tube 2. A plurality of spaced and evenly distributed card blocks 53 are arranged around the base 52, and a plurality of elastic expansion members 53 are arranged. A connection is formed between the bottoms of the parts 51, that is, the bottoms of the multiple elastic support parts 51 also present an annular seat structure, and a gap is formed between two adjacent elastic support parts 51. Each elastic support part 51 extends axially along the outer tube 2. In this embodiment, the multiple elastic support parts 51 are enclosed to form a cylindrical structure, and the base 52 is inserted into the bottom of the elastic support part 51 from one end enclosed by the multiple elastic support parts 51. The block 53 of the base 52 is snapped into the gap between the corresponding two adjacent elastic support parts 51 to form a limit, so that a rotation limit is formed between the base 52 and the multiple elastic support parts 51, so that the elastic body can drive the base 52 to rotate.

[0028] The positioning member 4 is a threaded column, and a threaded hole is provided in the center of the base 52 to slide with the threaded column, so that the base 52 can move axially back and forth along the threaded column, that is, the positioning member 4, by rotating, and the base 52 drives the elastic expansion member 51 to move axially back and forth.

[0029] In addition, a through hole is opened in the center of the limiting part 3, and the limiting part 3 is mounted on the positioning member 4, that is, the threaded column, through the through hole. The positioning member 4 is provided with a first limiting ring 6 at the through hole. In this embodiment, the first limiting ring 6 is screwed on the threaded column to form a limit to prevent the limiting part 3 from detaching from the positioning member 4.

[0030] A second limiting ring 7 is provided at the top of the positioning member 4 to prevent the base 52 from being separated from the positioning member 4 . The first limiting ring 6 and the second limiting ring 7 may be nuts or other limiting components that are threadedly connected to the positioning member 4 .

[0031] In addition, the elastic expansion member 51 is made of plastic, so that the elastic expansion member 51 has elastic deformation ability and does not generate noise when rubbing against the inner wall of the outer tube 2; the material of the limiting part 3 is also plastic, so that the elastic expansion member 51 is not easily worn when contacting the outer peripheral wall of the limiting part 3, and no noise is generated.

[0032] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. Telescopic rod, characterized in that: The invention comprises an inner tube (1) and an outer tube (2) which are sleeved with each other, wherein the end of the inner tube (1) extending into the outer tube (2) is provided with a limiting portion (3) as an insertion end (11), the bottom of the limiting portion (3) is connected to the insertion end (11), the top of the limiting portion (3) is provided with a central positioning member (4), the outer diameter of the outer peripheral wall of the limiting portion (3) gradually increases from the bottom to the top, the positioning member (4) is slidably connected with an elastic portion (5), so that the elastic portion (5) can reciprocate along the positioning member (4) in the same axis as the inner tube (1), and the elastic portion (5) has an elastic expansion member (51), and the elastic expansion member (51) forms static friction with the inner wall of the outer tube (2), so that when the inner tube (1) When the outer tube (2) rotates relative to the inner tube (1), the static friction between the outer tube (2) and the elastic expansion member (51) drives the elastic part (5) to move along the positioning member (4) toward the limiting part (3), and the elastic expansion member (51) cooperates with the outer peripheral wall of the limiting part (3), so that as the elastic part (5) moves toward the limiting part (3), the elastic expansion member (51) moves along the top of the limiting part (3) to the bottom, and the limiting part (3) gradually expands the elastic expansion member (51) until the elastic expansion member (51) is tightly against the inner wall of the outer tube (2), at which time the inner tube (1) and the outer tube (2) are in a mutually locked state, and no relative axial displacement occurs between the inner tube (1) and the outer tube (2); When the inner tube (1) and the outer tube (2) rotate in opposite directions relative to each other, the outer tube (2) drives the elastic part (5) to move along the positioning part (4) away from the limiting part (3), so that the elastic expansion part (51) of the elastic part (5) moves along the bottom of the limiting part (3) to the top, and the elastic expansion part (51) gradually retracts, and the elastic expansion part (51) and the inner wall of the outer tube (2) are released from the tight contact state, and at this time, the outer tube (2) and the inner tube (1) are in a mutually unlocked state.

2. The telescopic rod according to claim 1, characterized in that: The elastic part (5) comprises a base (52) and an elastic expansion member (51) connected to the base (52); the base (52) is slidably connected to the positioning member (4).

3. The telescopic rod according to claim 2, characterized in that: The elastic expansion member (51) is a long strip having a certain elastic deformation capability. A plurality of the long strips are spaced and evenly distributed around the base (52). The outer wall shape of the long strip is adapted to the inner wall of the outer tube (2).

4. The telescopic rod according to claim 3, characterized in that: A plurality of spaced and evenly distributed clamping blocks (53) are arranged around the base (52); a connection is formed between the bottoms of the plurality of elastic expansion members (51); a gap is formed between two adjacent elastic expansion members (51); the clamping blocks (53) are buckled in the gap between the corresponding two adjacent elastic expansion members (51) to form a limit, so that a rotation limit is formed between the base (52) and the plurality of elastic expansion members (51).

5. The telescopic rod according to claim 2, characterized in that: The positioning member (4) is a threaded column, and a threaded hole that slidably cooperates with the threaded column is provided in the center of the base (52).

6. The telescopic rod according to claim 2, characterized in that: A through hole is provided at the center of the limiting portion (3), and the limiting portion (3) is sleeved on the positioning member (4) through the through hole. The positioning member (4) is provided with a first limiting ring (6) at the through hole to prevent the limiting portion (3) from detaching from the positioning member (4).

7. The telescopic rod according to claim 6, characterized in that: A second limiting ring (7) is provided at the top end of the positioning member (4) to prevent the base (52) from detaching from the positioning member (4).

8. The telescopic rod according to claim 1, characterized in that: The elastic expansion member (51) is made of plastic.

9. The telescopic rod according to claim 1, characterized in that: The material of the limiting part (3) is plastic.

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