Telescopic poles

Abstract

Telescopic rod, characterized in that it comprises the nested inner tube (1) and outer tube (2), wherein the inner tube (1) has a seat body (3) at an end located in the outer tube (2), wherein the seat body (3) has a mounting column (4) at an end directed towards the outer tube (2), wherein the end of the mounting column (4) has a mounting bore (41) coaxial with the inner tube (1), wherein the stop rod (5) is arranged in the mounting bore (41), wherein the mounting column (4) is surrounded by the elastic spreading element (6), wherein the elastic spreading element (6) is located in the outer tube (2), wherein the elastic spreading element (6) is screwed to the outer circumference of the mounting column (4), wherein the elastic spreading element (6) has several ring-shaped spreading segments (62), wherein the several spreading segments (62) contract and expand relative to the axis center of the elastic spreading element (6). can,wherein the outer wall of the multiple spreading segments (62) bears against the inner wall of the outer tube (2) and thus rotates the elastic spreading element (6) with the outer tube (2), wherein the stop rod (5) is surrounded by the cone part (7), wherein the cone part (7) is located in the center of the multiple spreading segments (62) and can move axially along the stop rod (5), wherein the end with the smaller radial diameter of the cone part (7) is directed towards the bottom of the elastic spreading element (6), wherein, during a relative axial forward rotation of the outer tube (2) and the inner tube (1), the outer tube (2) or the seat body (3) rotates the elastic spreading element (6), causing the elastic spreading element (6) and the mounting column (4) to rotate relative to each other, causing the elastic spreading element (6) to move axially towards the end with the larger radial diameter of the cone part (7).wherein the cone part (7) gradually spreads the spreading segments (62) until the spreading segments (62) are firmly in contact with the inner wall of the outer tube (2), wherein the outer tube (2) and the inner tube (1) lock each other in this state, wherein the stop rod (5) is surrounded by a spring element (10), wherein the spring element (10) is located between the end with the larger radial diameter of the cone part (7) and the stop rod (5) to allow the cone part (7) axial elastic movement relative to the stop rod (5); wherein, during a relative axial backward rotation of the inner tube (1) and the outer tube (2), the outer tube (2) rotates together with the elastic spreading element (6), causing the elastic spreading element (6) and the mounting column (4) to rotate backward relative to each other, causing the elastic spreading element (6) to move axially towards the end with the smaller radial diameter of the cone part (7),wherein the spreading segments (62) of the elastic spreading element (6) gradually contract inwards, wherein the elastic spreading element (6) releases the tight contact state against the inner wall of the outer tube (2), wherein the outer tube (2) and the inner tube (1) mutually unlock in this state.

Description

TECHNICAL AREA

[0001] The present utility model relates to the technical field of telescopic poles and in particular to a telescopic pole. TECHNICAL BACKGROUND

[0002] Manual telescopic rods have a wide range of applications, for example as curtain rods and door rods. Two tube sections are inserted into one another, creating a relative sliding motion. A locking mechanism is provided between the two tube sections. When the two tube sections slide or extend relative to each other, the locking mechanism engages to achieve the telescopic function of the rod. For example, Chinese utility model CN208951048U discloses a locking structure for a telescopic rod body, which provides a connecting locking sleeve at the junction between the outer and inner tubes and is secured by a fastening screw. The structure is relatively complex, and the external locking mechanism compromises the uniformity of the telescopic rod.

[0003] DETAILED DESCRIPTION The purpose of this utility model is to design a telescopic rod that eliminates the shortcomings of the aforementioned technology. This utility model designs a telescopic rod comprising an inner tube and an outer tube, wherein the inner tube has a seat body at an end located in the outer tube, wherein the seat body has a mounting column at an end facing the outer tube, the end of the mounting column having a mounting bore coaxial with the inner tube, the stop rod being arranged in the mounting bore, the mounting column being surrounded by the elastic expanding element, the elastic expanding element being located in the outer tube, the elastic expanding element being screwed to the outer circumference of the mounting column, and the elastic expanding element having several annularly distributed expanding segments.wherein the multiple spreading segments can contract and expand relative to the axis center of the elastic spreading element, wherein the outer wall of the multiple spreading segments bears against the inner wall of the outer tube and thus rotates the elastic spreading element with the outer tube, wherein the stop rod is surrounded by the conical part, wherein the conical part is located in the center of the multiple spreading segments and can move axially along the stop rod, wherein the end with the smaller radial diameter of the conical part is directed towards the bottom of the elastic spreading element, wherein, in the case of a relative axial forward rotation of the outer tube and the inner tube, the outer tube or the seat body rotates the elastic spreading element, causing the elastic spreading element and the mounting column to rotate relative to each other, thereby displacing the elastic spreading element axially towards the end with the larger radial diameter of the conical part.wherein the conical part gradually spreads the spreading segments until the spreading segments are firmly in contact with the inner wall of the outer tube, the outer tube and the inner tube locking each other in this state, the stop rod being surrounded by a spring element, the spring element being located between the end with the larger radial diameter of the conical part and the stop rod to allow axial elastic movement of the conical part relative to the stop rod; when the inner tube and the outer tube rotate axially backward relative to each other, the outer tube rotates together with the elastic spreading element, causing the elastic spreading element and the mounting column to rotate backward relative to each other, thereby displacing the elastic spreading element axially toward the end with the smaller radial diameter of the conical part, the spreading segments of the elastic spreading element gradually contracting inward,wherein the elastic spreading element releases the tight fit against the inner wall of the outer tube, whereby the outer tube and the inner tube mutually unlock in this state.

[0004] Preferably, the mounting bore has an internal thread, and the stop rod has an external thread for screwing it into the mounting bore. Preferably, the elastic expanding element comprises the base and the expanding segments connected to the base, the base having a threaded bore screwed to the mounting column.

[0005] Preferably, the spreading segments are made from a block of plastic, wherein the inner wall of the spreading segments is a circular arc surface adapted to the outer wall of the cone part, with adjacent spreading segments being spaced apart. Preferably, the spring element is a spring, wherein the spring is mounted on the stop rod, the end of the stop rod facing the outer tube forming the stop end, with one end of the spring resting against the stop end and the other end resting against the end with the larger radial diameter of the cone part, wherein, when the spring is in an unloaded state, the length of the portion of the stop rod where the spring is located is smaller than the combined length of the cone part and the mounting column.

[0006] Preferably, the outer circumference of the mounting column has the thread, wherein the thread at the bottom of the mounting column has a stop to prevent the base from being screwed to the mounting column until it is clamped tight.

[0007] Preferably, the conical part is a truncated cone block body, wherein it is composed by joining two radially halved block bodies, the two block bodies having a half-hole structure, wherein the half-hole structures of the two block bodies form the complete round hole structure after joining, wherein the conical part is placed on the stop rod by means of the round hole structure.

[0008] Preferably, the nested ends of the inner tube and the outer tube are each straight tube sections, with the seat body, the mounting column, the stop rod, the elastic spreading element, the cone part and the spring element each being located in the corresponding straight tube section.

[0009] Preferably, the remaining pipe sections of the inner pipe and the outer pipe, apart from the straight pipe section, can be straight or curved pipe sections.

[0010] The technical advantages of the present utility model are as follows: The seat body is provided at the end of the inner tube, which is inserted into the outer tube. The mounting column is provided on the seat body, and the elastic expanding element is placed on the mounting column. The conical part is provided in the center of the elastic expanding element, with the outer wall of the conical part forming a truncated cone structure, where the diameter of one end is larger than the diameter of the other end. Static friction is formed between the elastic expanding element and the inner wall of the outer tube. When the outer tube rotates axially in one direction, the outer tube rotates the elastic expanding element along with it, causing the elastic expanding element to move axially towards the top of the mounting column. The elastic expanding element contacts the outer wall of the conical part and moves axially along the conical part.Since the outer wall of the cone section has a gradual slope, the elastic expanding element gradually expands, causing it to fit tightly against the inner wall of the outer tube. In this state, a tight fit forms between the elastic element and the outer tube, locking the outer and inner tubes together. When unlocking is required, either the outer or inner tube rotates axially in the opposite direction, with the outer tube rotating the elastic expanding element along with it, or the seat body rotating the elastic expanding element axially. The elastic expanding element then moves axially toward the base of the cone section. In this state, the elastic expanding element gradually contracts, releasing the tight fit against the inner wall of the outer tube.Consequently, the inner and outer tubes can be locked in any desired position after contraction and extension. This not only results in a simple structure without excessive machining of the tube components, but also provides excellent stability after locking. The stop rod is surrounded by a spring element, with one end of the spring element resting against the end face of the cone and the other end against the end of the stop rod. This allows the cone to form an elastic stop action as it moves axially along the stop rod. When the elastic expanding element moves into the locked position of the inner and outer tubes, the cone can continue to compress the spring element and move a certain distance.This movement process is relatively slow and thus forms the fine adjustment when extending the inner and outer tubes, allowing the inner and outer tubes to be fine-tuned by a certain distance without jamming occurring. DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is an exploded view of the overall structure of embodiment 1. Fig. Figure 2 is a sectional view of the overall structure of embodiment 1. Fig. Figure 3 is a structural view of the block body in embodiment 1. Fig. Figure 4 is a sectional view of the structure in the extended state of the inner tube and the outer tube in embodiment 2. Fig. Figure 5 is a sectional view of the structure in the contracted state of the inner tube and the outer tube in embodiment 2.

[0011] Reference symbols: (1) Inner tube; (2) Outer tube; (3) Seat body; (4) Mounting column; (41) Mounting hole; (42) Thread; (43) Internal thread; (5) Stop rod; (51) Stop end; (52) External thread; (6) Elastic spreading element; (61) Base; (62) Spreader segments; (63) Threaded hole; (7) Conical part; (71) Round hole structure; (72) Block body; (73) Half-hole structure; (9) Stop; (10) Spring element; (11) Straight tube section. SPECIFIC EXECUTION FORMS

[0012] The following explanations clearly and completely describe the technical solutions of the embodiments of this utility model with reference to the accompanying drawings. Obviously, the described embodiments represent only a subset of the embodiments of this utility model and not all of them. All other embodiments that those skilled in the art derive from the embodiments of this utility model are within the scope of protection of this utility model. Example 1

[0013] According to the Fig. 1 and Fig. 2. The present utility model comprises the nested inner tube (1) and the outer tube (2). The inner tube (1) has the seat body (3) at one end located in the outer tube (2). Both the inner tube (1) and the outer tube (2) have a round tube structure. The seat body (3) is a cylindrical structure, allowing it to be inserted into the end of the inner tube (1). A stop structure is provided between the seat body (3) and the inner tube (1), forming a fixed connection between them. The seat body (3) has the mounting column (4) on its end face facing the outer tube (2). The mounting column (4) is integrally formed with the seat body (3). The end of the mounting column (4) has a mounting bore coaxial with the inner tube (1). The stop rod (5) is provided in the mounting bore (41).The stop rod (5) can be connected to the mounting bore (41) by means of a screw connection and fixed with a spot adhesive coating to prevent the stop rod (5) from protruding from the mounting bore (41). Of course, other common connection types can also be used. In summary, the stop rod (5) must be installed securely in the mounting bore (41) to prevent it from protruding during long-term use. The mounting column (4) is surrounded by the elastic expansion element (6). The elastic expansion element (6) is located in the outer tube (2). The elastic expansion element (6) comprises the base (61) and the expansion segments (62) connected to the base (61). The base (61) has the threaded bore (63) which forms a screw connection with the outer circumference of the mounting column (4).

[0014] The multiple spreading segments (62) are distributed in a ring-shaped arrangement around the circumference of the elastic spreading element (6). The multiple spreading segments (62) can simultaneously contract and expand along the center axis of the elastic spreading element (6). The outer wall of the multiple spreading segments (62) rests against the inner wall of the outer tube (2), thereby creating static friction between the spreading segments (62) and the inner wall of the outer tube (2). Therefore, the elastic spreading element (6) can rotate together with the outer tube (2).

[0015] The stop rod (5) is surrounded by the conical part (7). The conical part (7) is located at the center of the multiple spreading segments (62) and can move axially along the stop rod (5). In this embodiment, the conical part (7) is a truncated cone block. A round hole structure (71) is provided at its center. The conical part (7) is placed onto the stop rod (5) by means of the round hole structure (71). The outer wall of the conical part (7) contacts the inner wall of the outer tube (2). The end with the smaller radial diameter of the conical part (7) is directed towards the base of the elastic spreading element (6). A relative rotation of the outer tube (2) and the inner tube (1) comprises two types of rotation. The first type of rotation is defined as forward rotation, i.e., the outer tube (2) or the inner tube (1) rotates in one direction.When the outer tube (2) rotates, it rotates the elastic expanding element (6) with it, causing the elastic expanding element (6) and the mounting column (4) to rotate relative to each other. This shifts the elastic expanding element (6) axially towards the end with the larger diameter of the conical part (7). The conical part (7) gradually expands the expanding segments (62) until the expanding segments (62) are firmly in contact with the inner wall of the outer tube (2). In this state, the outer tube (2) and the inner tube (1) lock against each other. When the inner tube (1) rotates, it rotates the seat body (3) with it. The elastic expanding element (6) rotates together with the seat body (3), causing the elastic expanding element (6) and the mounting column (4) to also rotate relative to each other. Locking of the inner tube (1) and the outer tube (2) can also be achieved.In this state, an adjustment between the inner tube (1) and the outer tube (2) is not possible.

[0016] The second type of rotation is defined as reverse rotation, meaning that the inner tube (1) or the outer tube (2) rotates in the opposite direction. Relative to the forward rotation, the outer tube (2) rotates backward, or the inner tube (1) rotates backward. The outer tube (2) rotates together with the elastic expanding element (6), causing the elastic expanding element (6) and the mounting column (4) to rotate backward relative to each other. This shifts the elastic expanding element (6) axially toward the end with the smaller diameter of the conical part (7). The expanding segments (62) of the elastic expanding element (6) gradually contract inward. The elastic expanding element (6) releases the tight fit against the inner wall of the outer tube (2). In this state, the outer tube (2) and the inner tube (1) unlock each other.In this state, the relative distance between the inner tube (1) and the outer tube (2) can be adjusted, allowing the telescopic rod to be extended.

[0017] The stop rod (5) is surrounded by a spring element (10). In this embodiment, the spring element (10) uses the spring. The spring is mounted on the stop rod (5). The end of the stop rod (5) facing the outer tube (2) forms the stop end (51). One end of the spring rests against the stop end (51), and the other end rests against the end with the larger diameter of the conical part (7), allowing the conical part (7) to form an elastic stop action when it moves axially along the stop rod (5). The purpose of the arrangement of the spring element (10) is that when the elastic expanding element (6) is rotated to the position of the end with the larger diameter of the conical part (7), the conical part (7) is displaced by a certain distance from the stop end (51) of the stop rod (5) due to the spring force of the spring element (10) and the resulting movement of the elastic expanding element (6).This creates a buffer path that prevents the cone section (7) from directly impacting the stop end (51) and resulting in complete locking. This buffer displacement path serves as a fine adjustment for the distance between the outer tube (2) and the inner tube (1). That is, when the outer tube (2) and the inner tube (1) telescope relative to each other, the telescoping path is divided into two sections. The first section is the movement of the elastic spreading element (6) along the cone section (7), during which it is gradually spread by the cone section (7) to its maximum angle. In this way, the outer tube (2) rests firmly against the spreading segments (62). This process is the coarse adjustment; that is, the telescoping adjustment is the coarse adjustment. After the first section, the cone part (7), since the spring element (10) is present, puts the spring element (10) under pressure and moves further together with the elastic spreading element (6).Due to the counterforce of the spring element (10), the movement is relatively slow.

[0018] Therefore, this process is the fine adjustment, i.e., the telescopic adjustment enters the fine adjustment phase after the coarse adjustment.

[0019] Furthermore, the spring element (10) is located between the end with the larger radial diameter of the cone part (7) and the stop rod (5) to allow the cone part (7) to have axial elastic movement relative to the stop rod (5).

[0020] Furthermore, the mounting bore (41) has an internal thread (43), and the stop rod (5) has an external thread (52) for screwing the stop rod (5) into the mounting bore (41).

[0021] Furthermore, the spreading segments (62) utilize the plastic block body. The inner wall of the spreading segments (62) is a circular arc surface adapted to the outer wall of the cone part (7). Adjacent spreading segments (62) are spaced apart, allowing them to undergo elastic deformation relative to the base (61) to form a synchronous spreading and contracting movement.

[0022] Furthermore, when the spring is in an unloaded state, the length of the section of the stop rod (5) where the spring is located is shorter than the combined length of the cone section (7) and the mounting column (4). This makes the connecting section of the stop rod (5) and the mounting column (4) longer, thus securing the stop rod (5) more firmly and preventing displacement and loosening of the stop rod (5) when the spring rod is under pressure.

[0023] Furthermore, the outer circumference of the mounting column (4) has the thread (42), the thread (42) having the stop (9) at the bottom of the mounting column (4) to prevent the base (61) from being screwed to the mounting column (4) until it is clamped.

[0024] Furthermore, the cone part (7) is formed by joining two radially halved block bodies (72) according to Fig. 3. The two block bodies (72) are assembled. The two block bodies (72) have a half-hole structure (73). After assembly, the half-hole structures (73) of the two block bodies (72) form the complete round hole structure (71). The conical part (7) is placed on the stop rod (5) by means of the round hole structure (71). Since the conical part (7) is limited by the spreading segments (62), it will not protrude from the spreading segments (62). Naturally, a locking mechanism is provided between the inner tube (1) and the outer tube (2) to prevent the inner tube (1) and the outer tube (2) from being excessively adjusted and separating after mutual unlocking. In this embodiment, the inner tube (1) and the outer tube (2) each have a straight tube structure, which allows the inner tube (1) and the outer tube (2) to telescope in a straight line. Example 2

[0025] The basic content corresponds to that of embodiment 1. The difference is that, according to Fig. 4 and Fig.5, the inner tube (1) and the outer tube (2) can have a curved tube structure, whereby the inner tube (1) and the outer tube (2) form a curved telescopic rod structure when inserted into each other. However, this requires that the inserted ends of the inner tube (1) and the outer tube (2) are each straight tube sections (11). The seat body (3) is installed in the straight tube section (11) of the inner tube (1). The mounting column (4), the stop rod (5), the elastic spreading element (6), the cone part (7), and the spring element (10) are each located in the corresponding straight tube section (11). In this way, reciprocating telescoping can only be achieved if the inserted ends of the inner tube (1) and the outer tube (2) are straight tube sections (11) during telescoping. The remaining pipe sections of the inner pipe (1) and the outer pipe (2) are a curved pipe structure except for the straight pipe section (11).In this way, the curved telescopic rod structure can be realized. The curved telescopic rod structure can be used as a curtain rod at corners. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 208951048U

[0002]

Claims

[1] Telescopic poles, characterized bythat it comprises the nested inner tube (1) and outer tube (2), wherein the inner tube (1) has a seat body (3) at an end located in the outer tube (2), wherein the seat body (3) has a mounting column (4) at an end directed towards the outer tube (2), wherein the end of the mounting column (4) has a mounting bore (41) coaxial with the inner tube (1), wherein the stop rod (5) is arranged in the mounting bore (41), wherein the mounting column (4) is surrounded by the elastic spreading element (6), wherein the elastic spreading element (6) is located in the outer tube (2), wherein the elastic spreading element (6) is screwed to the outer circumference of the mounting column (4), wherein the elastic spreading element (6) has several ring-shaped spreading segments (62), wherein the several spreading segments (62) can contract and expand relative to the axis center of the elastic spreading element (6),wherein the outer wall of the multiple spreading segments (62) bears against the inner wall of the outer tube (2) and thus rotates the elastic spreading element (6) with the outer tube (2), wherein the stop rod (5) is surrounded by the cone part (7), wherein the cone part (7) is located in the center of the multiple spreading segments (62) and can move axially along the stop rod (5), wherein the end with the smaller radial diameter of the cone part (7) is directed towards the bottom of the elastic spreading element (6), wherein, during a relative axial forward rotation of the outer tube (2) and the inner tube (1), the outer tube (2) or the seat body (3) rotates the elastic spreading element (6), causing the elastic spreading element (6) and the mounting column (4) to rotate relative to each other, causing the elastic spreading element (6) to move axially towards the end with the larger radial diameter of the cone part (7).wherein the cone part (7) gradually spreads the spreading segments (62) until the spreading segments (62) are firmly in contact with the inner wall of the outer tube (2), wherein the outer tube (2) and the inner tube (1) lock each other in this state, wherein the stop rod (5) is surrounded by a spring element (10), wherein the spring element (10) is located between the end with the larger radial diameter of the cone part (7) and the stop rod (5) to allow the cone part (7) axial elastic movement relative to the stop rod (5); wherein, during a relative axial backward rotation of the inner tube (1) and the outer tube (2), the outer tube (2) rotates together with the elastic spreading element (6), causing the elastic spreading element (6) and the mounting column (4) to rotate backward relative to each other, causing the elastic spreading element (6) to move axially towards the end with the smaller radial diameter of the cone part (7),wherein the spreading segments (62) of the elastic spreading element (6) gradually contract inwards, wherein the elastic spreading element (6) releases the tight contact state against the inner wall of the outer tube (2), wherein the outer tube (2) and the inner tube (1) mutually unlock in this state. [2] Telescopic pole according to claim 1, characterized by , that the mounting hole (41) has an internal thread (43), wherein the stop rod (5) has an external thread (52) to screw the stop rod (5) into the mounting hole (41). [3] Telescopic rod according to claim 2, characterized by , that the elastic spreading element (6) comprises the base (61) and the spreading segments (62) connected to the base (61), wherein the base (61) has a threaded bore (63) screwed to the mounting column (4). [4] Telescopic pole according to claim 3, characterized by, that the spreading segments (62) are made from a block body (72) made of plastic, wherein the inner wall of the spreading segments (62) is a circular arc surface adapted to the outer wall of the cone part (7), wherein adjacent spreading segments (62) are spaced apart. [5] Telescopic pole according to claim 1, characterized by , that the spring element (10) is a spring, wherein the spring is mounted on the stop rod (5), wherein the end of the stop rod (5) directed towards the outer tube (2) forms the stop end (51), wherein one end of the spring rests against the stop end (51), wherein the other end rests against the end with the larger radial diameter of the cone part (7), wherein, when the spring is in an unloaded state, the length dimension of the part of the stop rod (5) where the spring is located is smaller than the combined length of the cone part (7) and the mounting column (4). [6] Telescopic rod according to claim 3, characterized by, that the outer circumference of the mounting column (4) has the thread (42), wherein the thread (42) has the stop (9) at the bottom of the mounting column (4) to prevent the base (61) from being screwed to the mounting column (4) until it is clamped. [7] Telescopic rod according to claim 1, characterized by , that the cone part (7) is a truncated cone block body, wherein it is composed by joining two radially halved block bodies (72), wherein the two block bodies (72) have a half-hole structure (73), wherein the half-hole structures (73) of the two block bodies (72) form the complete round hole structure (71) after joining, wherein the cone part (7) is placed on the stop rod (5) by means of the round hole structure (71). [8] Telescopic rod according to claim 1, characterized by, that the nested ends of the inner tube (1) and the outer tube (2) are each straight tube sections (11), wherein the seat body (3), the mounting column (4), the stop rod (5), the elastic spreading element (6), the cone part (7) and the spring element (10) are each located in the corresponding straight tube section (11). [9] Telescopic rod according to claim 8, characterized by , that the remaining pipe sections of the inner pipe (1) and the outer pipe (2) except for the straight pipe section (11) can be straight or curved pipe sections.

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