Height adjusting device and furniture

Abstract

The utility model discloses a height adjusting device and furniture, which comprises a telescopic sleeve, a first middle-layer sleeve is arranged between an inner tube and an outer tube of the telescopic sleeve, the first middle-layer sleeve and the inner wall of the outer tube form a wedge-shaped self-locking structure, and the first middle-layer sleeve extrudes the inner tube through the wedge-shaped self-locking structure. The relative positions of the inner pipe and the outer pipe are locked, so that the height of the supported object is kept fixed; a non-contact adjusting assembly; the non-contact adjusting assembly is arranged on the outer pipe and the first middle-layer sleeve; the non-contact adjusting assembly is used for adjusting the position of the first middle layer sleeve on the inner pipe and adjusting the height of a supported object after the wedge-shaped self-locking structure is unlocked. The furniture height stepless adjusting device is extremely simple in structure, the number of parts is greatly reduced, furniture height stepless adjusting can be achieved without any tool or operating any button, operation is convenient and efficient, and the use experience of furniture height adjusting at present is greatly optimized and improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to furniture field especially, it relates to a height adjusting device and furniture. BACKGROUND

[0002] At present, non-electric furniture height adjusting device mainly has following several: 1, screw lifting adjustment, this mode, after-sale cost is low, installation, adjustment is complicated, need to solve the risk problem of exposed hole to children, need to adjust with special tool, cannot stepless adjustment, use experience is not friendly;2, jump bead lifting adjustment, manufacturing cost is low, installation, after-sale cost is high, need to solve the risk problem of exposed hole to children, need not adjust with special tool, cannot stepless adjustment, use experience is relatively friendly;3, hand-operated screw rod lifting adjustment, structure is complex, is easy to break down, manufacturing cost, installation cost, after-sale cost is high, need to adjust with hand-operated lever special tool, can stepless adjustment, use experience is friendly;4, air pressure rod, hydraulic rod lifting adjustment, manufacturing, installation cost is high, service life is shorter, long-term use has the function failure risk of air leakage, oil leakage, has the high temperature, high pressure explosion risk of external environment or high frequency use, need not adjust with special tool can stepless adjustment, use experience is friendly. CONTENT OF UTILITY MODEL

[0003] The application describes a height adjusting device and furniture, aiming at providing a furniture height adjustment mode with low manufacturing, installation and after-sale cost, no risk of exposed hole, no need to adjust with special tool and convenient stepless adjustment, and friendly use experience.

[0004] To achieve the above object, the utility model provides a height adjusting device.

[0005] Telescopic sleeve;

[0006] The first intermediate sleeve and the inner wall of the outer tube form a wedge-shaped self-locking structure, the first intermediate sleeve extrudes the inner tube through the wedge-shaped self-locking structure, and the relative position of the inner tube and the outer tube is locked to keep the height of the supported object fixed.

[0007] Alternatively, the first intermediate sleeve and the second intermediate sleeve form a wedge-shaped self-locking structure, the first intermediate sleeve extrudes the inner tube through the wedge-shaped self-locking structure, and the relative position of the inner tube and the outer tube is locked to keep the height of the supported object fixed.

[0008] Non-contact adjusting assembly;

[0009] The non-contact adjusting assembly is arranged between the outer tube and the first intermediate sleeve.

[0010] The non-contact adjustment component is used to adjust the position of the first middle layer sleeve on the inner tube when the wedge-shaped self-locking structure is unlocked, and to adjust the height of the supported object.

[0011] In an embodiment, the non-contact adjustment component comprises a meandering slide, a strip-shaped hole, and a steel ball.

[0012] The upper part of the first middle layer sleeve is provided with a meandering slide.

[0013] The upper part of the outer tube is provided with a strip-shaped hole, and the steel ball is clamped and slides between the meandering slide and the strip-shaped hole. By the reciprocating sliding or locking of the steel ball between the meandering slide and the strip-shaped hole, the position of the first middle layer sleeve on the inner tube is adjusted.

[0014] In an embodiment, the first middle layer sleeve has a wedge-shaped structure with one thick end and one thin end, and the inner wall of the outer tube has a wedge-shaped structure with one thick end and one thin end.

[0015] When the height adjustment device bears the pressure from the supported object, the first middle layer sleeve and the outer tube slide in opposite directions to form a wedge-shaped self-locking structure, which extrudes the inner tube. The friction between the outer wall of the first middle layer sleeve and the inner tube fixes the position between the inner tube and the outer tube.

[0016] In an embodiment, the second middle layer sleeve has a wedge-shaped structure with one thick end and one thin end, and contacts the outer wall of the inner tube.

[0017] The second middle layer sleeve and the first middle layer sleeve are partially sleeved.

[0018] When the height adjustment device bears the pressure from the supported object, the first middle layer sleeve and the second middle layer sleeve slide in opposite directions to form a wedge-shaped self-locking structure, which extrudes the inner tube. The friction between the outer wall of the first middle layer sleeve and the inner tube fixes the position between the inner tube and the outer tube.

[0019] In an embodiment, the first middle layer sleeve and the second middle layer sleeve are made of rubber, plastic, or metal.

[0020] In an embodiment, when the user lifts the supported object, the wedge-shaped self-locking between the first middle layer sleeve and the outer tube or between the first middle layer sleeve and the second middle layer sleeve is released, and the first middle layer sleeve can slide up and down along the inner tube.

[0021] When the user continues to lift the supported object, the strip-shaped hole drags the steel ball to move to the bottom pit of the outer edge of the meandering slide, and the steel ball prevents the first middle layer sleeve from rising relative to the inner tube, but can be lowered, and the height of the supported object can be adjusted.

[0022] When the user continues to exert downward pressure on the supported object, the strip-shaped hole drags the steel ball to move to the concave position in the meandering slide, the steel ball prevents the first intermediate sleeve from descending relative to the inner tube, but can ascend, and the height of the supported object can be adjusted lower;

[0023] When the first intermediate sleeve is adjusted to the desired position relative to the inner tube, the supported object is lifted again and then pressed downward, the first intermediate sleeve and the outer tube re-form a wedge-shaped self-locking structure or the first intermediate sleeve and the second intermediate sleeve re-form a wedge-shaped self-locking structure, the position of the first intermediate sleeve and the inner tube is locked, the height adjustment is completed and fixed.

[0024] The utility model also provides a kind of furniture, and furniture includes the height adjusting device of any of the above technical solutions.

[0025] The utility model technical scheme, structure is extremely simple, spare and accessory quantity is greatly reduced, first intermediate sleeve and meandering slide, second intermediate sleeve are once injection moulded, product precision is high, solid and durable, production efficiency is high, material cost, processing cost, installation cost, after-sales service cost is low. Through non-contact stepless adjustment circulation self-locking structure, without the aid of any tool, without operating any button, furniture height stepless adjustment can be realized, operation is convenient, efficient, greatly optimizes and promotes the use experience of current furniture height adjustment. DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings from the structures shown in the drawings without creating labor.

[0027] Figure 1 The external structure schematic diagram of the height adjusting device of the utility model is shown;

[0028] Figure 2 The first intermediate sleeve and outer tube self-locking structure schematic diagram of the height adjusting device of the utility model is shown;

[0029] Figure 3 The first intermediate sleeve and second intermediate sleeve self-locking structure schematic diagram of the height adjusting device of the utility model is shown;

[0030] Figure 4 The furniture non-contact height adjustment operation schematic diagram of the height adjusting device of the utility model is shown;

[0031] Figure 5 The furniture non-contact height adjustment operation schematic diagram of the height adjusting device of the utility model is shown.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] Wherein: 1-inner tube, 2-outer tube, 31-the first middle layer cover, 32-the second middle layer cover, 4-non-contact adjustment assembly, 41-back slide, 42-strip hole, 43-steel ball.

[0034] The object, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] It should be noted that if the present application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0037] In addition, if the present application embodiments involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B schemes. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0038] The present application provides a height adjusting device.

[0039] As Figure 1 , Figure 2 , Figure 3As shown, the height adjustment device of this utility model can be installed in furniture such as telescopic sleeve table legs and chair legs. A first middle layer sleeve 31 is installed between the two telescopic sleeves of the inner tube 1 and the outer tube 2, or a first middle layer sleeve 31 and a second middle layer sleeve 32 are installed between the two telescopic sleeves of the inner tube 1 and the outer tube 2. A non-contact adjustment component 4 is provided between the first middle layer sleeve 31 and the outer tube 2.

[0040] In this configuration, the first middle sleeve 31 directly forms a wedge-shaped self-locking with the wall of the outer metal tube 2, or the first middle sleeve 31 forms a wedge-shaped self-locking with the second middle sleeve 32. The friction force formed by the wedge-shaped self-locking between the first middle sleeve 31 and the outer tube wall of the inner tube 1 is not less than the pressure of furniture such as tables or chairs on the inner tube 1, thereby locking the relative position of the inner tube 1 and the outer tube 2 to maintain the fixed height of the furniture.

[0041] The non-contact adjustment component 4 includes: a spiral slide 41 provided on the upper part of the first middle layer sleeve 31, a strip hole 42 on the upper part of the outer tube 2, and a steel ball 43 embedded between the spiral slide 41 and the strip hole 42.

[0042] When the furniture is lifted, the wedge-shaped self-locking between the first middle layer sleeve 31 and the outer tube 2, or between the first middle layer sleeve 31 and the second middle layer sleeve 32, can be continuously adjusted by lifting or pressing the furniture without direct contact with the first middle layer sleeve 31. This is achieved through the cyclic sliding or locking of the steel ball 43 between the loop slide 41 and the strip hole 42. When the position of the first middle layer sleeve 31 on the inner tube 1 is determined, the steel ball 43 moves to the top of the loop slide 41, and pressing down the furniture restores the pressure on the inner tube 1. Because the first middle layer sleeve 31 and the outer tube 2, or the first middle layer sleeve 31 and the second middle layer sleeve 32, form a wedge-shaped self-locking, the height of the tabletop or chair seat and other furniture can be continuously adjusted.

[0043] like Figure 2 The illustrated furniture height stepless adjustment device features a wedge-shaped self-locking structure between a first middle sleeve 31 and an outer tube 2. The first middle sleeve 31 has a wedge-shaped plane or curved surface that is thinner at the bottom and thicker at the top. The outer tube 2 has its wall stamped into an inwardly concave wedge-shaped plane or curved surface that is higher at the bottom and lower at the top. Under the pressure of the furniture, the first middle sleeve 31 and the outer tube 2 move in opposite directions. The first middle sleeve 31 squeezes the inner tube 1, increasing the friction between the first middle sleeve 31 and the inner tube 1, thereby preventing the furniture height from decreasing.

[0044] Specifically, the first intermediate sleeve 31 is designed with a wedge-shaped structure that is thinner at the bottom and thicker at the top, and can be in the form of a plane or a curved surface. The inner wall of the outer tube 2 is formed into an inwardly concave wedge-shaped structure by a stamping process, characterized by a higher bottom and a lower top, which matches the wedge-shaped design of the first intermediate sleeve 31.

[0045] When pressure is applied from the furniture, the first middle sleeve 31 moves downwards under the action of friction, while the outer tube 2 remains stationary, resulting in relative displacement between the two. As the first middle sleeve 31 moves downwards, it gradually compresses the inner tube 1 located inside it. This compression increases the contact area and pressure between the first middle sleeve 31 and the inner tube 1, thereby significantly increasing the friction between them. The increased friction allows the middle sleeve to firmly grip the inner tube, preventing it from sliding down under the weight or pressure of the furniture and ensuring the stability of the furniture's height. Specifically, the middle sleeve assembly can be made of materials such as rubber or plastic.

[0046] In this embodiment, the wedge-shaped design of the first middle sleeve 31 and the outer tube 2 enhances their tight fit under pressure, further improving the self-locking effect. The reverse movement between the first middle sleeve 31 and the outer tube 2 not only increases friction but also enhances the locking strength through the characteristics of the wedge structure, ensuring that the furniture height remains stable even when external forces are applied to it.

[0047] When the furniture height needs to be adjusted, the user temporarily releases the wedge-shaped self-locking between the first middle layer sleeve 31 and the outer tube 2 by lifting the furniture. After unlocking, the inner tube 1 can slide freely inside the outer tube 2, preparing for height adjustment. The user continues to lift or press the furniture, at which point the position of the first middle layer sleeve 31 relative to the inner tube 1 can be changed through non-contact adjustment components (such as steel balls and a spiral slide system), achieving stepless height adjustment. After adjusting to the desired height, the user releases the furniture, and the furniture weight reapplies pressure. The first middle layer sleeve 31 and the outer tube 2 re-form a wedge-shaped self-locking, restoring friction and locking the new height position.

[0048] This self-locking structure between the first middle layer sleeve 31 and the outer tube 2 not only enables tool-free height adjustment but also significantly improves the stability and safety of the furniture during use. Utilizing simple mechanical principles, it achieves stepless height adjustment through the cooperation of two wedge-shaped structures, ensuring the stability of the adjusted height. Furthermore, this design boasts advantages such as simple structure, ease of maintenance, and aesthetic appeal, making it a highly practical and innovative solution.

[0049] like Figure 3 The device shown is a stepless height adjustment device for furniture. The first middle layer sleeve 31 and the second middle layer sleeve 32 have a self-locking structure. The middle layer sleeve 31 has a wedge-shaped plane or curved surface that is thinner at the bottom and thicker at the top, and the second middle layer sleeve 32 has a wedge-shaped plane or curved surface that is thinner at the top and thicker at the bottom. Under the pressure of the furniture, the first middle layer sleeve 31 and the second middle layer sleeve 32 move in opposite directions. The first middle layer sleeve 31 squeezes the inner tube 1, which increases the friction between the first middle layer sleeve 31 and the inner tube 1, thereby supporting the furniture height and preventing it from falling.

[0050] Specifically, the first middle sleeve 31 is designed with a wedge-shaped structure that is thinner at the bottom and thicker at the top, which can be in the form of a plane or a curved surface. The second middle sleeve 32 is designed with a wedge-shaped structure that is thinner at the top and thicker at the bottom, which is complementary to the middle sleeve.

[0051] Under the pressure of the furniture, the first middle sleeve 31 and the second middle sleeve 32 will move relatively. Specifically, the first middle sleeve moves downward relative to the second middle sleeve 32 under the pressure, and this relative movement causes the first middle sleeve 31 to gradually press the inner tube 1 located inside it, thereby increasing the friction between the first middle sleeve 31 and the inner tube 1. The increased friction allows the first middle sleeve 31 to firmly grasp the inner tube 1, preventing it from sliding downward under the action of external force, ensuring the stability of the furniture height.

[0052] The wedge-shaped design of the first middle sleeve 31 and the second middle sleeve 32 enhances their close fit under pressure, further improving the self-locking effect. The reverse movement between the first middle sleeve and the second middle sleeve not only increases the friction but also enhances the locking strength through the characteristics of the wedge-shaped structure, ensuring that the furniture height remains stable even if external force is applied to the furniture.

[0053] When the height of the furniture needs to be adjusted, the user temporarily releases the self-locking state between the first middle sleeve 31 and the second middle sleeve 32 by lifting or pressing the furniture. After unlocking, the inner tube 1 can freely slide inside the outer tube 2, preparing for height adjustment. The user continues to lift or press the furniture, which can change the position of the first middle sleeve 31 relative to the inner tube 1 through a non-contact adjustment component (such as a steel ball and a back-shaped slide system), achieving stepless adjustment of the height.

[0054] After adjusting to the desired height, the user releases the furniture, and the furniture weight re-applies pressure. The first middle sleeve 31 and the second middle sleeve 32 form self-locking again, restoring the friction and locking the new height position.

[0055] When increasing the height of the furniture, the user lifts the upper part of the furniture, causing the first middle sleeve 31 to move upward and release the self-locking. Lifting the furniture again causes the first middle sleeve 31 to move downward along the inner tube until the desired height is reached. Pressing down - lifting lightly - putting down the furniture, the first middle sleeve 31 and the second middle sleeve 32 form a wedge-shaped self-locking again, locking the new height.

[0056] When reducing the height of the furniture, the user lifts the upper part of the furniture, causing the first middle sleeve 31 to move upward and release the self-locking. The user presses down the furniture during the sliding process of the first middle sleeve 31, causing the first middle sleeve 31 to start moving upward along the inner tube. Lifting lightly and putting down the furniture, the first middle sleeve 31 and the second middle sleeve 32 form a wedge-shaped self-locking again, locking the new height.

[0057] The self-locking structure of the first middle sleeve 31 and the second middle sleeve 32 not only realizes the height adjustment function without tools, but also significantly improves the stability and safety of the furniture in use. It uses simple mechanical principles to achieve stepless adjustment of the height through the cooperation of the two wedge-shaped structures, and ensures the stability of the adjusted height. In addition, the design also has the advantages of simple structure, easy maintenance and beauty, and is a very practical and innovative solution.

[0058] Specifically, the vertical pressure applied by the furniture to the inner tube 1 is P, the friction coefficient between the inner wall of the first middle sleeve 31 and the outer wall of the inner tube 1 is μ1, the wedge angle between the first middle sleeve 31 and the second middle sleeve 32 is α, the friction coefficient is μ2, and the positive pressing force generated by the wedge-shaped self-locking is N. In order to prevent the inner tube 1 from slipping with the first middle sleeve 31, it is necessary to ensure that the friction force F between the first middle sleeve 31 and the inner tube 1 is large enough to resist the vertical pressure P, that is,

[0059] ① F = μ1*N ≥ P

[0060] The wedge angle α will decompose the applied vertical load P into the normal pressure N along the contact surface between the first middle sleeve 31 and the second middle sleeve 32, thereby increasing the friction between the first middle sleeve 31 and the inner tube 1.

[0061] This force increasing effect can be represented by the following formula:

[0062] ② N = P / (sin(α) + μ2cos(α))

[0063] Substituting ② into ①, we have

[0064] μ1*(P / (sin(α) + μ2cos(α))) ≥ P

[0065] μ1 / (sin(α) + μ2cos(α)) ≥ 1

[0066] μ1 ≥ sin(α) + μ2cos(α)

[0067] That is, when the friction coefficient μ1 between the first middle sleeve 31 and the inner tube 1 is greater than or equal to sin(α) + μ2cos(α), the inner tube 1 can be prevented from slipping with the first middle sleeve 31, thereby maintaining the height of the furniture. Therefore, the friction coefficient μ1 between the first middle sleeve 31 and the inner tube 1 must be large enough, the friction coefficient μ2 between the first middle sleeve 31 and the second middle sleeve 32 must be small enough, and the wedge angle α is as small as possible to maximize the normal pressure N and improve the stability of the furniture without affecting the experience of lifting to release the wedge-shaped self-locking.

[0068] Figure 4 、 Figure 5The embodiment shown describes a non-contact height adjustment process of a furniture height stepless adjustment device.

[0069] Specifically, the furniture non-contact height adjustment step:

[0070] I. Preparation for adjustment: lift the furniture to release the furniture height self-lock.

[0071] The user first lifts the upper part of the furniture (such as the tabletop or seat surface), which drives the first middle sleeve 31 and the meandering slide 41 on the inner tube 1 to move upwards. The first middle sleeve 31 moves upwards, and the wedge-shaped self-locking state between the first middle sleeve 31 and the second middle sleeve 32 or the outer tube 2 is released. The inner tube 1 can freely slide inside the outer tube 2, preparing for subsequent height adjustment.

[0072] II. Adjusting the height of the furniture: lifting the furniture.

[0073] The user lifts the furniture again, which makes the first middle sleeve 31 continue to move upwards. The strip-shaped hole 42 drags the steel ball 43 to move to the bottom pit at the outer edge of the meandering slide 41, which prevents the first middle sleeve 31 from moving further upwards. At this time, the furniture can only be adjusted higher, and the inner tube 1 is continued to be lifted, the first middle sleeve 31 moves downwards along the inner tube 1, and the height of the furniture such as a table or a chair is adjusted higher.

[0074] III. Adjusting the height of the furniture: pressing down the furniture.

[0075] Next, the user presses down the furniture, and the strip-shaped hole 42 drags the steel ball 43 to move to the bottom pit at the inner edge of the meandering slide 41, which prevents the first middle sleeve 31 from moving further downwards. At this time, the furniture can only be adjusted lower, and the furniture is continued to be pressed down, the first middle sleeve 31 moves upwards along the inner tube 1, and the height of the furniture such as a table or a chair is adjusted lower.

[0076] IV. Locking the height of the furniture: lifting the furniture slightly and then pressing it down to restore the furniture height self-lock.

[0077] The user first lifts the furniture slightly and then presses it down, and the strip-shaped hole 42 drags the steel ball 43 to move downwards and then to the top end of the meandering slide 41, and the first middle sleeve 31 and the second middle sleeve 32 or the outer tube 2 form a wedge-shaped self-lock again. The positions of the inner tube 1 and the outer tube 2 are locked, and the height of the furniture is fixed.

[0078] In this embodiment, the non-contact height adjustment is achieved by the sliding of the steel ball 43 between the grooved meandering slide 41 and the strip-shaped hole 42, and the stable locking after each adjustment is ensured. The wedge-shaped design between the first middle sleeve 31 and the second middle sleeve 32 or the outer tube 2 generates sufficient friction under pressure to lock the height.

[0079] In this embodiment, the user can complete the height adjustment without directly contacting the middle sleeve, which simplifies the operation process and provides a good operation experience.

[0080] By sliding the steel ball between the meander-shaped slide and the strip-shaped hole, very fine height adjustment can be achieved. Once locked, the height is stable and not easily changed, ensuring the safety of furniture use.

[0081] This non-contact height adjustment method not only improves the user experience, but also simplifies the manufacturing process and reduces production costs. It is a very practical and innovative solution. It skillfully combines mechanical principles and material properties to make furniture height adjustment convenient and reliable.

[0082] The above is only an optional embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings, or direct / indirect application in other related technical fields under the utility model concept of the present application is included in the patent protection scope of the present application.

Claims

1. A height adjustment device, characterized in that Comprising: a telescopic sleeve; a first intermediate sleeve is arranged between the inner tube and the outer tube of the telescopic sleeve, the first intermediate sleeve and the inner wall of the outer tube form a wedge-shaped self-locking structure, the first intermediate sleeve extrudes the inner tube through the wedge-shaped self-locking structure, the relative position of the inner tube and the outer tube is locked so as to keep the height of the supported object fixed; or, a first intermediate sleeve and a second intermediate sleeve are arranged between the inner tube and the outer tube of the telescopic sleeve, the first intermediate sleeve and the second intermediate sleeve form a wedge-shaped self-locking structure, the first intermediate sleeve extrudes the inner tube through the wedge-shaped self-locking structure, the relative position of the inner tube and the outer tube is locked so as to keep the height of the supported object fixed; a non-contact adjustment assembly; the non-contact adjustment assembly is arranged between the outer tube and the first intermediate sleeve; the non-contact adjustment assembly is used to adjust the position of the first intermediate sleeve on the inner tube after the wedge-shaped self-locking structure is unlocked, and the height of the supported object is adjusted.

2. The height adjustment device according to claim 1, wherein: the non-contact adjustment assembly comprises a meandering slide, a strip-shaped hole, and a steel ball; the upper part of the first intermediate sleeve is provided with a meandering slide; the upper part of the outer tube is provided with a strip-shaped hole, and the steel ball is clamped and slides between the meandering slide and the strip-shaped hole, and the position of the first intermediate sleeve on the inner tube is adjusted by the steel ball sliding back and forth between the meandering slide and the strip-shaped hole or being locked.

3. The height adjustment device according to claim 1, wherein: the first intermediate sleeve has a wedge-shaped structure with one end thick and one end thin, and the inner wall of the outer tube has a wedge-shaped structure with one end thick and one end thin; when the height adjustment device bears pressure from the supported object, the first intermediate sleeve and the outer tube slide in opposite directions to form a wedge-shaped self-locking structure, the wedge-shaped self-locking structure extrudes the inner tube, and the friction between the outer wall of the first intermediate sleeve and the inner tube fixes the position between the inner tube and the outer tube.

4. The height adjustment device according to claim 1, wherein: the second intermediate sleeve has a wedge-shaped structure with one end thick and one end thin, and contacts the outer wall of the inner tube; the second intermediate sleeve is partially sleeved with the first intermediate sleeve; when the height adjustment device bears pressure from the supported object, the first intermediate sleeve and the second intermediate sleeve slide in opposite directions to form a wedge-shaped self-locking structure, the wedge-shaped self-locking structure extrudes the inner tube, and the friction between the outer wall of the first intermediate sleeve and the inner tube fixes the position between the inner tube and the outer tube.

5. The height adjustment device according to claim 1, wherein: the first intermediate sleeve and the second intermediate sleeve are made of rubber, plastic, or metal.

6. The height adjustment device according to claim 2, wherein: when the user lifts the supported object, the wedge-shaped self-locking between the first intermediate sleeve and the outer tube or between the first intermediate sleeve and the second intermediate sleeve is released, and the first intermediate sleeve can slide up and down along the inner tube. When the user continues to pull the supported object, the strip-shaped hole drags the steel ball to move to the bottom recess at the inner edge of the meandering slide, the steel ball prevents the first middle layer sleeve from rising relative to the inner tube, but can descend, and the height of the supported object can be adjusted upward; When the user continues to apply downward pressure to the supported object, the strip-shaped hole drags the steel ball to move to the bottom recess at the inner edge of the meandering slide, the steel ball prevents the first middle layer sleeve from rising relative to the inner tube, but can descend, and the height of the supported object can be adjusted upward; When the first middle layer sleeve is adjusted to the desired position relative to the inner tube, the supported object is lifted again and then pressed downward, the first middle layer sleeve and the outer tube re-form a wedge-shaped self-locking structure or the first middle layer sleeve and the second middle layer sleeve re-form a wedge-shaped self-locking structure, and the position of the first middle layer sleeve and the inner tube is locked, so that the height adjustment is completed and fixed.

7. Furniture, characterized in that The height adjustment device according to any one of claims 1-6. The height adjustment device according to any one of claims 1-6.

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