A lifting and adjusting mechanism for an attitude corrector

Abstract

This patent discloses a lifting and adjusting mechanism for a posture corrector, including a receiving tube and at least one telescopic tube slidably sleeved therein. The telescopic tube is provided with a stop module, which includes: a positioning part for axially fixing the stop module to the telescopic tube and having a friction surface exposed to the telescopic tube; and an elastic part for applying a radial expansion force to the positioning part. Under the action of the radial expansion force, the friction surface of the positioning part forms abutment friction with the inner wall of the adjacent wall, forming a surface-to-surface friction pair, so that when the external adjustment force is removed, the telescopic tube immediately self-locks and stops at any axial position.

Description

Technical Field

[0001] This patent relates to ergonomic office supplies, specifically a lifting and adjusting mechanism for a posture corrector. Background Technology

[0002] Posture correctors, as physical devices for preventing and assisting in correcting poor posture in children, belong to the technical field of ergonomics and health monitoring devices. With increasing societal attention to spinal health and vision protection among adolescents, this market has shown significant growth in recent years. Their core function is to physically intervene and force users to maintain an appropriate distance between their chest and the edge of the desk when reading or writing, thereby avoiding poor posture such as hunching and excessive eye contact. To achieve this function, mainstream posture correctors on the market generally follow a modular design paradigm, typically consisting of three core components: a chest support component, a height adjustment component, and a desk-mounting (or desktop-fixing) component. The chest support component, as the part in direct contact with the body, often uses flexible covering materials to enhance comfort; its core function is to set and maintain the physical distance between the chest and the edge of the desk. The desk-mounting component is responsible for securely installing the entire device on the desktop; common forms include a clamp-on base or a flat writing board, and its design must ensure the stability of the device. The lifting mechanism is crucial for product adaptability. Connecting the chest support and the table-mounting component, its technical performance directly determines the adjustment experience and long-term reliability. Currently, most products in this field use a multi-section telescopic sleeve structure for stepless height adjustment. The key technical challenge lies in achieving a smooth adjustment feel and reliable locking at any position while ensuring sufficient support. The industry-standard solution involves radial friction damping mechanisms on each stage of the telescopic sleeve's movable inner tubes. A typical and widely used technique involves creating an annular groove on the outer wall of the movable inner tube and embedding an O-ring within it. When the inner tube is fitted into the outer tube, the rubber ring makes interference contact with the inner wall of the outer tube, relying on the static friction generated by the elastic deformation of the rubber material to provide damping, thus achieving self-locking of the telescopic rod in the adjusted position. This solution has become the industry's default choice due to its simple structure and low cost. Although rubber ring damping solutions are widely used, those skilled in the art and long-term users are well aware of a series of inherent engineering defects. These defects severely impact the user experience and lifespan of the product, constituting a clear pain point for industry technological upgrades. Firstly, regarding the feel, the inherent high coefficient of friction and viscoelasticity of rubber materials result in strong resistance to movement under dry friction conditions. Adjustment often involves "jamming" or "jumping," failing to achieve linear, smooth force feedback. Children often require considerable force to adjust the rubber ring, and the process is stiff, significantly reducing usability and user willingness to adjust. Secondly, regarding reliability and durability, rubber rings are highly susceptible to wear, aging, and even permanent deformation under long-term, repeated axial friction and radial compression cyclic loads. Wear leads to a reduction in the diameter of the rubber ring, decreasing the normal pressure between it and the inner wall of the outer tube, thus significantly attenuating the provided frictional damping force.This ultimately manifests as the telescopic rod failing to lock properly; with even slight external force, the chest support component slides down, rendering the lifting function completely ineffective. This means the product's core functionality is lost over time, resulting in a limited lifespan. Furthermore, changes in ambient temperature and humidity affect the physical properties of the rubber ring, further exacerbating performance instability. These issues collectively point to a core technical contradiction: the existing simple and inexpensive solutions cannot simultaneously meet the three crucial performance indicators for enhancing user experience: smooth adjustment, reliable locking, and durability.

[0003] Therefore, there is an urgent need in this field for an innovative lifting and adjustment mechanism solution. It needs to start from the mechanics of materials and structural design, aiming to provide a damping mechanism with balanced and moderate damping force, smooth and linear adjustment process, and extremely long wear resistance and life, so as to completely overcome the drawbacks of traditional rubber ring solutions and promote the development of posture corrector products towards high-end and reliable directions. Utility Model Content

[0004] The purpose of this patent is to provide a lifting and adjusting mechanism for posture correctors, which aims to solve the technical problems of traditional rubber ring damping solutions, such as stiff adjustment feel, insufficient smoothness, poor durability due to easy wear, and locking failure.

[0005] To solve the above-mentioned technical problems, this patent adopts the following technical solution: A lifting and adjusting mechanism for a posture corrector includes a receiving tube and at least one telescopic tube slidably fitted therein. The telescopic tube is provided with a stop module, which includes: a positioning part for axially fixing the stop module to the telescopic tube and having a friction surface exposed to the telescopic tube; and an elastic part for applying a radial expansion force to the positioning part. Under the action of the radial expansion force, the friction surface of the positioning part forms abutment friction with the inner wall of the adjacent wall, forming a surface-to-surface friction pair, so that when the external adjustment force is removed, the telescopic tube immediately self-locks and stops at any axial position.

[0006] Furthermore, the elastic part is a compression spring.

[0007] Furthermore, the positioning part includes a main body and at least one protrusion extending from the main body.

[0008] Furthermore, the telescopic tube has a limiting groove on its wall.

[0009] Furthermore, the protrusion is engaged within the limiting groove to achieve axial fixation.

[0010] Furthermore, the positioning part is provided with a limiting boss for accommodating the elastic part.

[0011] Furthermore, the positioning part is integrally injection molded from polymer engineering plastic.

[0012] Furthermore, polymer engineering plastics are materials with good wear resistance and high elastic modulus.

[0013] Furthermore, the number of telescopic tubes is at least two to form a multi-stage telescopic structure.

[0014] Furthermore, each stage of the telescopic tube is equipped with a stop module.

[0015] Furthermore, the bottom of the receiving tube is provided with an adapter for fixed connection with the writing board of the posture corrector.

[0016] Furthermore, the innermost telescopic tube has its top end used to connect to the chest support assembly of the posture corrector.

[0017] Furthermore, the elastic part is one of a leaf spring, torsion spring, spring or elastic rubber body.

[0018] Preferably, the positioning part in this patent is integrally injection molded from polyoxymethylene (POM). Polyoxymethylene (POM) is a high-performance engineering thermoplastic, renowned for its near-metallic strength, rigidity, and excellent fatigue and wear resistance, earning it the nickname "acetal" in the field of precision machinery. POM has an extremely low coefficient of friction, with its dynamic and static coefficients of friction being nearly identical. Furthermore, it possesses excellent self-lubricating properties, forming a stable transfer film on the mating surfaces during sliding, thus achieving smooth and quiet sliding friction. This is fundamentally different from the high and unstable coefficient of friction (often greater than 0.5) of rubber materials and their friction mechanism relying on viscoelastic deformation. This directly translates into a linear, smooth, and stepless adjustment feel perceptible to the user. Moreover, POM has extremely high rigidity and dimensional stability; under long-term continuous radial pressure (provided by a spring), its creep resistance far surpasses that of rubber. This means that the pressure applied by the POM positioning part to the inner wall of the outer tube remains almost constant throughout the product's entire lifespan, ensuring long-term consistency of damping force and eliminating the "locking failure" problem caused by material stress relaxation. Furthermore, POM has low hygroscopicity, and its mechanical properties are insensitive to changes in temperature and humidity. Therefore, this lifting mechanism maintains stable operating performance in various climatic environments, overcoming the drawbacks of rubber materials hardening at low temperatures, leading to a poorer feel, and softening at high temperatures, resulting in a decrease in locking force.

[0019] Optionally, the material for the positioning part can also be selected from nylon (such as PA6, PA66). Nylon materials also possess excellent wear resistance, high mechanical strength, and good self-lubricating properties. Although its elastic modulus is slightly lower than that of POM, it can still effectively meet the design requirements as a rigid friction carrier, ensuring the stable transmission of damping force. Those skilled in the art will understand that, in addition to POM and nylon, any other polymer engineering plastic that can simultaneously meet the two core requirements of "high wear resistance" and "high elastic modulus" (such as certain modified polycarbonate (PC), polyetheretherketone (PEEK), etc.) can be used as optional materials to achieve the purpose of this patent.

[0020] This patent provides a lifting and adjusting mechanism for a posture corrector, which has the following advantages compared to the prior art: First, the existing technology (rubber ring solution) is essentially a "material elastomer self-deformation damping". Its damping force directly originates from the volume deformation of the rubber ring under radial compression, with friction and elasticity stemming from the same material. This leads to a non-linear force-displacement relationship, and as the material ages and wears, its elastic and frictional properties decline simultaneously, resulting in very limited performance and lifespan. This patent, however, separates the "elastic force application" from the "friction" function: the friction function is undertaken by a rigid or semi-rigid engineering plastic component (such as a POM injection molded part) with high wear resistance and a low coefficient of friction. This component itself has small deformation, providing a stable and reliable sliding contact interface. The elastic force application function is undertaken by an independent elastic element (such as a coil spring), which is responsible for providing radial positive pressure, rather than the nonlinear deformation of rubber. Therefore, the resistance felt by the user when adjusting the height is uniform, smooth, and linear, eliminating the feeling of "sticking" and "jumping" and improving the operating experience. Secondly, the friction surface is made of engineering plastics (such as polyoxymethylene POM) with excellent self-lubrication and high wear resistance. Its wear rate is extremely low. Combined with the stable pressure provided by the elastic part, it can ensure that the damping performance does not significantly decrease in tens of thousands of repeated extension and retraction cycles, achieving an ultra-long service life and reliable hovering function at any position. Finally, the stop module is integrally molded by injection molding process, with a compact structure and simple assembly, effectively controlling manufacturing costs while improving performance. Attached Figure Description

[0021] The above content of this patent and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solution.

[0022] Figure 1 This is an exploded view of the lifting and adjusting mechanism; Figure 2 A 3D schematic diagram of the stop module; Figure 3 Top view diagram of the stop module; Figure 4Side view diagram of the stop module; Figure 5 A schematic diagram of the front view of the stop module; Figure 6 This is a schematic diagram of the lifting and adjusting mechanism in its retracted state. Figure 7 for Figure 6 A schematic diagram of a cross-sectional view along the AA direction; Figure 8 This is a schematic diagram of the lifting and adjusting mechanism in the pulled-out state; Figure 9 for Figure 8 Schematic diagram of cross-sectional view in the BB direction; Figure 10 A schematic diagram of the lifting and adjusting mechanism assembled on the posture corrector.

[0023] The reference numerals in the attached figures are explained as follows: Breast support component: 70 Adapter: 80 Writing board: 90 Stop module: 100 Positioning Department: 110 Main body: 111 Bump: 112 Swing component: 113 Limiting boss: 114 Friction surface: 115 Elastic part: 120 First telescopic tube: 200 First limiting groove: 210 Second telescopic tube: 300 Connector: 310 Second limiting groove: 320 Receiving tube: 400 Detailed Implementation

[0024] The detailed features and advantages of this patent are described below in the specific embodiments. The content is sufficient to enable any person skilled in the art to understand the technical content of this patent and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this patent.

[0025] This specification also uses several compound terms to describe devices, components, equipment, etc. that include more than one function, or to assign additional functions to a corresponding device, component, equipment, etc. Those skilled in the art will understand that such compound terms can be implemented by a single or multiple devices, components, equipment, etc., as long as they are reasonable under the interpretation rules of this patent terminology.

[0026] It should be noted that in this specification, similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and interpreted in subsequent figures. In this specification and claims, several terms will be used, and unless otherwise indicated, these terms will be defined as having the following meanings: The terms “comprising” or “having” have the same meaning as “containing”, and also include other forms of the term, such as the gerund and singular forms in English, meaning including but not limited to, and not intended to exclude, for example, other elements, components, integers or steps. All other terms used herein for special definition are intended to have the general meaning understood by one of ordinary skill in the art, and in particular, meaning that one of ordinary skill in the art, upon reading the claims, specification and drawings of this patent, can directly and without doubt determine how the technical solution of this patent can be implemented.

[0027] Even if there are incomplete descriptions, omissions, or ambiguities in the grammar, words, punctuation, graphics, symbols, etc. of the claims, specification, and drawings of this patent, a person skilled in the art can still arrive at the only correct understanding by reading the claims, specification, and drawings as a whole without extensive reasoning or experimentation, and effectively exclude various incorrect interpretations that are not aimed at achieving the purpose of this patent.

[0028] Those skilled in the art would first choose to read the claims, specification, and drawings of this patent to reasonably interpret the terms; secondly, they would choose to refer to the relevant definitions in other documents published by the applicant before the filing date to reasonably interpret the terms; thirdly, they would choose the references cited in this patent to reasonably interpret the terms; and finally, they would choose to combine the technical dictionaries, technical manuals, reference books, textbooks, national or industry technical standards, etc., commonly used by those skilled in the art to reasonably interpret the terms.

[0029] All references cited in this application are incorporated herein by way of quotation, to the extent that they do not contradict the disclosure herein. It will be apparent to those skilled in the art that products (apparatus, components, devices, compounds, compositions, materials, etc.) and methods (processes, steps, conditions, parameters, equipment, and test methods, equipment, etc.) not specifically described herein can be applied to the implementation of the patented creation fully disclosed herein without the need for excessive experimentation. This patent is intended to cover all functional equivalents known in the art of the methods, apparatus, apparatus components, materials, processes, and techniques specifically described herein. All cited references include: The following publications are included: Marks' Standard Handbook for Mechanical Engineers (11th edition and other editions prior to the filing date of this application), published by McGraw-Hill, Inc.; DeGarmo's Materials and Processes in Manufacturing (13th edition and other editions prior to the filing date of this application), published by Wiley; Machinery's Handbook (32nd edition and other editions prior to the filing date of this application), published by Industrial Press Inc.; Mechanical Design Handbook (6th edition and other editions prior to the filing date of this application), edited by Cheng Daxian, published by Chemical Industry Press; and Modern Mechanical Design Handbook (6th edition and other editions prior to the filing date of this application), edited by Wen Bangchun, published by Machinery Industry Press.

[0030] It should be noted that, for ease of description and understanding, this patent document may use directional terms such as "left," "right," "up," "down," "axial," and "lateral." These terms are based on the orientation shown in the drawings or the relative positional relationships of the components in their normal use state, and should not be construed as an absolute limitation on the scope of protection of this utility model. For those skilled in the art, in conjunction with the full text of the specification and the drawings, it can be understood that the essence of these directional descriptions is to clarify the relative connection and fit relationships of the components. Therefore, any equivalent transformation of the orientation or position of the components based on the essential concept of this utility model should be included within the scope of protection of the claims of this patent.

[0031] like Figure 1 and Figure 10 As shown, this embodiment provides a lifting and adjusting mechanism for a posture corrector. The lifting and adjusting mechanism is installed between the chest support assembly 70 and the writing board 90 (or desktop fixing assembly) of the posture corrector.

[0032] Combination Figures 1 to 5 and Figure 7 , Figure 9As shown, the lifting and adjusting mechanism of this utility model can be flexibly configured as a two-, three-, or more-stage telescopic structure according to the actual height adjustment range requirements of the product. Regardless of the number of telescopic stages, it is easy to understand that each movable telescopic tube (except for the outermost fixed receiving tube) is equipped with a stop module 100 with the same structural principle, but with a size-modulated design based only on the tube diameter. To illustrate its structure in detail, the following will take the three-stage telescopic structure shown in the attached figure (i.e., containing two movable telescopic tubes) as an example for specific explanation. It can be understood that for more stages of structure, the connection and working principle are similar.

[0033] Specifically, the three-stage telescopic structure mainly includes: a stop module, a first telescopic tube 200 as the middle telescopic tube, a second telescopic tube 300 as the inner telescopic tube, and a receiving tube 400 as the outermost fixing member.

[0034] The bottom end of the receiving tube 400 is fixedly connected to the writing board 90 via an adapter 80, forming the fixed base of the mechanism. The first telescopic tube 200 is slidably sleeved inside the receiving tube 400, and the second telescopic tube 300 is slidably sleeved inside the first telescopic tube 200, thus forming a multi-stage telescopic structure. The stop module 100, as a modular independent unit, is respectively set on the first telescopic tube 200 and the second telescopic tube 300.

[0035] In this embodiment, the second telescopic tube 300, as the innermost movable tube, is in its highest position when fully extended. In applications requiring connection between the lifting mechanism and the chest support assembly 70 of the posture corrector, a connecting part can be provided at the top of the second telescopic tube 300. For example, the top of the second telescopic tube 300 can be fixedly connected to the chest support assembly 70 via a connector 310. In other embodiments, the connection point can also be located on other levels of telescopic tubes, or different forms such as threaded connection or snap-fit ​​connection can be used. When the user pulls or presses the chest support assembly 70, the first and second telescopic tubes will extend or retract sequentially within the receiving tube 400, while the stop module 100 provides the necessary frictional damping, enabling the telescopic tubes to achieve stable suspension at any extension or retraction position. This conveniently adapts to the sitting height requirements of different users.

[0036] Combination Figures 1 to 5 As shown, the stop module 100 is designed as an independent, pre-assembleable functional unit. In a multi-stage telescopic structure, a stop module 100 is configured on each telescopic tube that requires sliding damping between itself and the wall of the previous stage.

[0037] The positioning part 110 is preferably integrally molded from a polymer engineering plastic with high wear resistance, low coefficient of friction, and self-lubricating properties, such as polyoxymethylene (POM), using an injection molding process. This manufacturing process ensures that complex geometries can be mass-produced with high precision and consistency. In this embodiment, the positioning part 110 includes a main body 111 and two swing members 113, which are symmetrically connected to both sides of the main body 111. At least one protrusion 112 extends integrally from the outer side of the main body 111, making the side view of the positioning part 110 generally "U" shaped. The positioning part 110 generally forms an open cavity for accommodating the elastic part 120. On the side of each swing member 113 facing the interior of the cavity, a limiting boss 114 is integrally formed for axially limiting the elastic part 120. The two swing members 113 can have a small elastic deflection deformation capability around their connection with the main body 111 under external force. On the side of each swing member 113 facing away from the cavity and the limiting boss 114 (i.e., the outer side), a smooth, exposed friction surface 115 is formed in the assembled state. The friction surface 115 is made of POM material and has rigid surface characteristics. It should be noted that the fixing method between the positioning part 110 and the telescopic tube is not limited to this snap-fit ​​form. In other feasible embodiments, alternative methods such as bonding, interference fit or screw connection can also be used to achieve reliable axial fixing.

[0038] The key to selecting the aforementioned polymer engineering plastic lies in its simultaneous possession of excellent wear resistance and high elastic modulus. High wear resistance ensures that the friction surface 115 made of this material experiences minimal wear during long-term, repeated sliding friction, resulting in a lifespan far exceeding that of traditional rubber. Meanwhile, the high elastic modulus (i.e., high stiffness) guarantees that when radial pressure is applied to the elastic part 120, the swinging member 113 of the positioning part 110 acts as a rigid support with minimal deformation, thereby efficiently and stably transmitting and converting most of the elastic force into normal pressure from the friction surface 115 against the pipe wall, achieving "rigid friction." Polyoxymethylene (POM) and nylon (PA6, PA66) are typical engineering plastics that meet these performance requirements. Those skilled in the art will understand that any other suitable engineering plastic possessing similar wear resistance and high modulus properties is within the scope of this patent.

[0039] In this preferred embodiment, two protrusions 112 are symmetrically arranged. During assembly, the protrusions 112 can be engaged into the preset limiting grooves on the corresponding telescopic pipe wall, thereby achieving axial fixation of the entire stop module 100 on the telescopic pipe.

[0040] The "exposed" nature of the friction surface 115 is specifically defined as follows: when the stop module 100 is installed on the telescopic tube (e.g., the second telescopic tube 300), its friction surface 115 extends radially beyond the outer contour surface of the telescopic tube (the second telescopic tube 300) itself, thereby being configured as a dedicated functional surface for direct contact with the inner wall of a larger diameter telescopic tube or receiving tube (e.g., the first telescopic tube 200 or the receiving tube 400) to form a sliding friction pair.

[0041] The elastic part 120 is a force-applying element independent of the positioning part 110. It is laterally positioned within the cavity formed by the two swing members 113 and positioned between the two limiting bosses 114. In this preferred embodiment, the elastic part 120 is a compression spring made of metal. In its natural or pre-compressed state, the two ends of the compression spring abut against the limiting bosses 114 of the two swing members 113, thereby continuously applying a pair of opposite, radially outward expansion forces to the two swing members 113. This force is directly transmitted to the rigid friction surface 115 of the swing member 113, forcing the friction surface 115 to press against the inner side of the adjacent pipe wall. The independent design of the positioning part and the elastic part achieves functional decoupling of "elastic force application" and "rigid friction". The independent elastic part 120 provides linear and stable radial normal force; while the swing members 113 and friction surfaces 115, made of high-performance engineering plastic, act as rigid carriers, converting this normal force into stable, low-wear sliding friction with the pipe wall. The small elastic deformation allowed by the swing element 113 allows it to better adapt to the microscopic unevenness of the pipe wall, ensuring uniform contact of the friction surface 115. At the same time, its main structure still maintains the nature of rigid friction, which is fundamentally different from the traditional rubber damping mechanism that relies on the deformation of the material body.

[0042] For the implementation of the elastic part 120, in addition to the aforementioned preferred compression spring, those skilled in the art can select other independent elements with elastic recovery capabilities according to specific space constraints, cost requirements, or desired force-displacement curves. For example: leaf spring: one or more metal leaf springs can be used. The leaf spring can be pre-bent into a specific arc, and its two ends or middle are constrained in the cavity of the positioning part or a suitable slot. When subjected to compression from the oscillating member, the bending deformation of the leaf spring generates a reverse force, providing the required radial expansion force for the friction surface. The leaf spring can provide relatively rigid linear or near-linear force characteristics; torsion spring: a torsion spring can be arranged so that its torsion arm acts on the two oscillating members respectively. When the oscillating members tend to close inward, it will drive the torsion arm to torsion the torsion spring, and the resulting restoring torque is converted into a radial force that drives the oscillating member (113) to open. This arrangement may be more suitable for space-constrained axial layouts; elastic rubber body: a columnar, block-shaped or specifically shaped elastic rubber (or an elastic polymer with similar properties) can be used as the elastic part. It is placed between two swinging parts or pre-pressed into the cavity, and the compression deformation of the rubber body itself is used to provide a continuous radial force with certain damping characteristics.

[0043] Specifically, see Figures 6-10 The cross-sections of the first telescopic tube 200 and the second telescopic tube 300 are racetrack-shaped (i.e., a shape formed by two parallel straight sides and two semi-circular ends). This design facilitates the stable installation of a limiting structure on the tube wall and provides an anti-rotation function. Of course, the cross-sectional shape of the telescopic tube is not limited to this; in other embodiments, circular, rectangular, etc., shapes can also be used.

[0044] On the walls of both the first telescopic tube 200 and the second telescopic tube 300, corresponding to the positions where the stop module 100 is installed, corresponding limiting grooves are provided. Specifically, a pair of transverse second limiting grooves 320 are provided on the second telescopic tube 300; a pair of transverse first limiting grooves 210 are provided on the first telescopic tube 200. Here, "transverse" means that the length direction of the groove is approximately perpendicular to the axial direction (i.e., the telescopic direction) of the telescopic tube. The limiting grooves are for the protrusions 112 of the stop module 100 to engage, so as to achieve axial (vertical) positioning and fixation.

[0045] The receiving tube 400 is the outermost fixed tube, and its bottom end is fixedly connected to the adapter 80. The first telescopic tube 200, together with the second telescopic tube 300 inside it, is inserted into the receiving tube 400.

[0046] Combination Figures 6 to 9As shown, the following details the pulling and adjusting process of the lifting and adjusting mechanism and the principle behind its stable hovering at any position. For clarity, the interaction between the first telescopic tube 200 (along with its stop module 100) and the receiving tube 400 will be described in detail. The interaction principle between the second telescopic tube 300 and the first telescopic tube 200 is the same and will not be repeated.

[0047] When the user does not apply axial adjustment force, the lifting adjustment mechanism is in a stationary hovering state. At this time, the stop module 100 installed on the first telescopic tube 200 has its elastic part 120 (compression spring) in a pre-compressed state, continuously applying a radially outward expansion force to the two swinging members 113. This force is transmitted through the swinging members 113 to the rigid friction surface 115 on their outer side, causing the two friction surfaces 115 to press against the inner wall of the receiving tube 400 with a constant positive pressure. This contact interface forms a surface-to-surface dry friction pair: one side is the friction surface 115 made of POM material with high hardness and a smooth surface; the other side is the metal or hard plastic inner wall of the receiving tube 400. Under the pressure provided by the elastic part 120, this friction pair generates sufficient static friction. This static friction balances the downward force generated by the weight of components such as the chest support assembly 70, the second telescopic tube 300, and the first telescopic tube 200, thereby allowing the entire telescopic system to be stably maintained at any extension length without any additional locking operation, achieving "stepless hovering". When the user applies axial tension to lift the chest support assembly 70 or applies pressure to press down, the force is transmitted to the first telescopic tube 200 through the second telescopic tube 300. Once the axial adjustment force overcomes the maximum static friction of the aforementioned friction pair, the first telescopic tube 200 begins to slide axially relative to the receiving tube 400. During the sliding process, the independent elastic part 120 provides almost linear and stable radial pressure, and the coefficient of dynamic friction between the POM friction surface 115 and the inner wall of the receiving tube is low and stable. The magnitude of the sliding friction remains uniform and controllable during the sliding process. The adjustment resistance felt by the user is smooth, linear, and without any step-like sensation. When the user reaches the desired height and removes the external force, the sliding stops immediately. At this time, due to the continued radial pressure of the elastic part 120, the sliding friction instantly returns to static friction. The mechanism can immediately re-establish force balance at the current position without any locking action or displacement compensation, achieving instantaneous and reliable "self-locking".

[0048] The chest support assembly 70 typically includes a support section that comes into direct contact with the chest and abdomen. This support section is generally covered with flexible materials (such as silicone, sponge, or soft plastic) to enhance comfort and avoid discomfort from hard contact. When the user leans forward, the chest touches this support section, passively reminding and limiting further contact between the body and the edge of the table, thus maintaining a reasonable viewing distance and spinal posture. In application, the chest support assembly is connected to the top of the height adjustment mechanism via a detachable or adjustable connection (such as a plug, threaded connection, or snap-fit).

[0049] The writing board 90 is primarily in the form of a flat writing board. Flat writing boards are placed directly on a desktop, and their surface may have an anti-slip structure to increase stability, used to support items such as books or laptops.

[0050] Assembly process

[0051] The assembly of the stop module is completed by installing the elastic part 120 into the cavity of the positioning part 110; The assembled stop module 100 is inserted into the limiting groove on the telescopic tube with its protrusion 112 to complete the fixation on the corresponding telescopic tube; Insert the telescopic tube with the stop module 100 installed into the receiving tube axially from bottom to top; The bottom end of the receiving tube 400 is fixedly connected to the adapter 80, which is used to connect to a desktop fixing component (such as a writing board 90). Connect the chest support assembly 70 to the top of the telescopic tube.

[0052] For lifting and adjusting mechanisms with more levels of telescopic tubes (e.g., two or more levels), the assembly process follows the same logic: first, the stop module 100 is installed on the innermost telescopic tube, and then it is successively inserted into the adjacent outer telescopic tubes. At the same time, the corresponding stop module 100 is installed on the outer telescopic tubes until all movable telescopic tubes are installed and finally inserted into the receiving tube 400.

[0053] It should be noted that, to prevent the telescopic tubes from detaching from each other when fully extended, an axial limiting structure is usually provided between adjacent telescopic tubes. For example, a radial tapering structure can be provided at the top of each telescopic tube. Therefore, during assembly, the inner telescopic tube must be inserted axially from the bottom opening of its corresponding outer telescopic tube (i.e., the end without the tapering) to ensure assembly feasibility and achieve the final stroke limit.

[0054] Industrial application

[0055] This patent provides a lifting and adjusting mechanism for a posture corrector, which has the following advantages compared to the prior art: First, the existing technology (rubber ring solution) is essentially a "material elastomer self-deformation damping". Its damping force directly originates from the volume deformation of the rubber ring under radial compression, with friction and elasticity stemming from the same material. This leads to a non-linear force-displacement relationship, and as the material ages and wears, its elastic and frictional properties decline simultaneously, resulting in very limited performance and lifespan. This patent, however, separates the "elastic force application" from the "friction" function: the friction function is undertaken by a rigid or semi-rigid engineering plastic component (such as a POM injection molded part) with high wear resistance and a low coefficient of friction. This component itself has small deformation, providing a stable and reliable sliding contact interface. The elastic force application function is undertaken by an independent elastic element (such as a coil spring), which is responsible for providing radial positive pressure, rather than the nonlinear deformation of rubber. Therefore, the resistance felt by the user when adjusting the height is uniform, smooth, and linear, eliminating the feeling of "sticking" and "jumping" and improving the operating experience. Secondly, the friction surface is made of engineering plastics (such as polyoxymethylene POM) with excellent self-lubrication and high wear resistance. Its wear rate is extremely low. Combined with the stable pressure provided by the elastic part, it can ensure that the damping performance does not significantly decrease in tens of thousands of repeated extension and retraction cycles, achieving an ultra-long service life and reliable hovering function at any position. Finally, the stop module is integrally molded by injection molding process, with a compact structure and simple assembly, effectively controlling manufacturing costs while improving performance.

[0056] The terminology and expressions used herein are for descriptive purposes only and this patent should not be limited to these terms and expressions. The use of these terms and expressions does not imply the exclusion of any illustrative and descriptive equivalent features (or parts thereof), and it should be recognized that various possible modifications should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

[0057] Similarly, it should be noted that although this patent has been described with reference to the specific embodiments described above, those skilled in the art should recognize that the above embodiments are only used to illustrate this patent, and various equivalent changes or substitutions can be made without departing from the spirit of this patent. Therefore, any changes or modifications to the above embodiments within the essential spirit of this patent will fall within the scope of the claims of this patent.

Claims

1. A lifting and adjusting mechanism for a posture corrector, comprising a receiving tube and at least one telescopic tube axially slidably sleeved therein, characterized in that: The telescopic tube is equipped with a stop module, which includes: Positioning part: for axially fixing the stop module to the telescopic tube and having a friction surface exposed to the telescopic tube; and, The elastic part applies a radial expansion force to the positioning part; Under the action of the radial expansion force, the positioning part forms a contact friction between its friction surface and the inner wall of the adjacent wall, forming a surface-to-surface friction pair. Thus, when the external adjustment force is removed, the telescopic tube can instantly self-lock and hover at any axial position.

2. The lifting and adjusting mechanism for a posture corrector according to claim 1, characterized in that, The elastic part is a compression spring.

3. The height adjustment mechanism for a posture corrector of claim 1, wherein, The positioning part includes a main body and at least one swinging member connected to the main body; the swinging member is provided with the friction surface; a protrusion extends from the main body, and a limiting groove is provided on the wall of the telescopic tube, and the protrusion is engaged in the limiting groove to achieve axial fixation of the stop module.

4. The lifting and adjusting mechanism for a posture corrector according to claim 3, characterized in that, The positioning part is provided with a limiting boss for accommodating the elastic part.

5. The lifting and adjusting mechanism for a posture corrector according to any one of claims 1-4, characterized in that, The positioning part is integrally injection molded from polymer engineering plastic.

6. The lifting and adjusting mechanism for a posture corrector according to claim 5, characterized in that, The polymer engineering plastic is a material with good wear resistance and high elastic modulus.

7. The lifting and adjusting mechanism for a posture corrector according to claim 1, characterized in that, The number of telescopic tubes is at least two to form a multi-stage telescopic structure; each stage of the telescopic tube is equipped with the stop module.

8. The lifting and adjusting mechanism for a posture corrector according to claim 7, characterized in that, The bottom of the receiving tube is provided with an adapter, which is used to fix the writing board of the posture corrector.

9. The lifting and adjusting mechanism for a posture corrector according to claim 8, characterized in that, The innermost telescopic tube has its top end used to connect to the chest support assembly of the posture corrector.

10. The lifting and adjusting mechanism for a posture corrector according to claim 1, characterized in that, The elastic part is one of a leaf spring, torsion spring, spring or elastic rubber body.

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