Lifting mechanism of a chair

Abstract

This utility model discloses a chair lifting mechanism, including an inner tube, an outer tube assembly, and a cylinder. A fixing plate is welded to one end of the inner tube, and the fixing plate is connected to the seat. A slider is provided on the side wall of the other end of the inner tube. The outer tube assembly is fitted over the inner tube and includes an outer tube and a sleeve. The outer tube includes a first port and a second port. The sleeve is inserted into the first port, and a longitudinal groove is formed on the sleeve. By rotating the outer tube, the slider slides into or out of the groove. The cylinder is inserted into the inner tube, and the piston rod of the cylinder is connected to the fixing plate by screws. The tail end of the cylinder is connected to the sleeve by screws. When the seat is raised or lowered, the slider slides out of or into the groove when the cylinder lifts the seat or is compressed by the seat. This increases the lifting and compression time, achieving a buffering effect and improving the comfort of the seat during use.

Description

Technical Field

[0001] This utility model relates to the field of office chair technology, and in particular to a chair lifting mechanism. Background Technology

[0002] There are many types of chairs, from traditional wooden seats to modern functional chairs. Today, in most office environments, the most common type is the swivel armchair with height adjustment. This type of chair not only rotates flexibly, allowing users to operate it in different directions, but it is also specially designed with height adjustment to accommodate different heights and usage habits. However, in the process of raising and lowering the chair, existing office chairs usually use a relatively simple mechanical principle: using a built-in cylinder to lift the seat, thus raising the seat height. While this process is convenient, lowering the seat requires the user's own weight to press down on the seat, causing the cylinder to return to its original position. Although this design is practical, the lack of an effective cushioning mechanism results in a lack of smooth transition during seat descent, significantly reducing comfort and leading to a poor user experience. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a chair lifting mechanism, whose structure mainly includes three parts: an inner tube, an outer tube assembly, and a cylinder. One end of the inner tube is firmly connected to a fixing plate by welding, which is directly connected to the seat to ensure the stability of the seat. A slider is provided on the side wall of the other end of the inner tube for realizing the lifting function of the seat. The outer tube assembly is fitted outside the inner tube, and its structure includes an outer tube and a sleeve. The outer tube has two ports, a first port and a second port. The sleeve is inserted into the first port, and a groove is formed on the sleeve along the longitudinal direction. By rotating the outer tube, the slider can smoothly slide into or out of the groove, thereby realizing the lifting adjustment of the seat.

[0004] According to some embodiments of this utility model, the slider adopts a scheme of two symmetrically arranged blocks, and the two sliders are completely symmetrical in structure; correspondingly, the slide groove also adopts a scheme of two symmetrically arranged blocks, ensuring that the movement of the slider in the slide groove is more stable; in addition, a circular arc edge is designed to extend downward from the side of the slide groove, which allows the slider to slide into the slide groove more smoothly along the circular arc edge, further optimizing the motion performance of the lifting mechanism.

[0005] According to some embodiments of the present invention, in order to ensure the smoothness of the inner tube sliding inside the outer tube, the outer tube assembly is also specially equipped with a sliding sleeve; the sliding sleeve is fixed inside the second port and is slidably fitted on the inner tube, reducing the friction between the inner tube and the outer tube and improving the sliding effect; the outer tube assembly also includes a push sleeve, which is installed inside the outer tube and fitted on the inner tube.

[0006] According to some embodiments of this utility model, in order to prevent dust and other impurities from entering the inner cavity of the outer tube and affecting the normal operation of the mechanism, a dust cover is also designed for the outer tube assembly. The dust cover is fitted onto the inner tube, and a connecting plate is provided on the outer edge of the second port. The connecting plate and the dust cover are connected by a snap-fit ​​to ensure the stability of the dust cover. Specifically, the dust cover is provided with a locking block, and the connecting plate is provided with a corresponding locking slot. The locking block is inserted into the locking slot, realizing a tight connection between the dust cover and the connecting plate.

[0007] According to some embodiments of this utility model, the sleeve is provided with a first connecting hole, and a first connecting screw is installed in the first connecting hole. The screw is connected to the tail end of the cylinder. At the same time, the fixing plate is provided with a second connecting hole, and a second connecting screw is installed in the second connecting hole. The screw is connected to the piston rod of the cylinder to ensure the cylinder is firmly installed. In addition, in order to further enhance the strength and stability of the fixing plate, reinforcing ribs are specially designed on the fixing plate to improve the overall structural strength of the fixing plate.

[0008] This utility model has at least the following beneficial effects:

[0009] The cylinder is inserted inside the inner tube, and its piston rod is tightly connected to the fixed plate with screws to ensure that the cylinder can stably transmit force during operation. The tail end of the cylinder is also connected to the tube sleeve with screws to form a complete power transmission system. When the seat needs to be raised or lowered, the cylinder lifts the seat or is compressed by the seat through the extension and retraction of its piston rod. During this process, the slider slides out of or into the slide groove accordingly. This design effectively increases the duration of lifting and compression, providing a good cushioning effect and significantly improving the comfort and stability of the seat during use.

[0010] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0012] Figure 1 This is an exploded view of an embodiment of the present invention;

[0013] Figure 2 This is a cross-sectional view of the present invention under compressed conditions according to an embodiment of the present invention;

[0014] Figure 3 This is a cross-sectional view of the lifted state according to an embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of the sleeve according to an embodiment of the present utility model. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0017] In the description of this utility model, "more than" means two or more, and "greater than," "less than," "exceeding," etc., are understood to exclude the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0018] Reference Figures 1 to 3 As shown, a chair lifting mechanism mainly comprises three parts: an inner tube 100, an outer tube assembly 200, and a cylinder 300. One end of the inner tube 100 is securely connected to a fixing plate 110 via welding. This fixing plate 110 is directly connected to the seat to ensure its stability. A slider 120 is provided on the side wall of the other end of the inner tube 100 to achieve the seat lifting function.

[0019] The outer tube assembly 200 is fitted onto the outside of the inner tube 100, and its structure includes an outer tube 210 and a sleeve 220. The outer tube 210 has two ports, namely a first port 211 and a second port 212.

[0020] The sleeve 220 is inserted into the first port 211, and a groove 221 is formed on the sleeve 220 in the longitudinal direction. By rotating the outer tube 210, the slider 120 can be smoothly slid into or out of the groove 221, thereby realizing the height adjustment of the seat.

[0021] Cylinder 300 is inserted inside inner tube 100, and its piston rod is tightly connected to fixed plate 110 by screws to ensure stable power transmission during operation. The tail end of cylinder 300 is also connected to sleeve 220 by screws, forming a complete power transmission system. When the seat needs to be raised or lowered, cylinder 300, through the extension and retraction of its piston rod, lifts the seat or is compressed by the seat. During this process, slider 120 slides out of or into groove 221 accordingly. This design effectively increases the duration of lifting and compression, providing good cushioning and significantly improving the comfort and stability of the seat during use.

[0022] To further improve the stability and reliability during the lifting process, the number of sliders 120 can be even. For example, in this embodiment, two sliders 120 are used, and the two sliders 120 are completely symmetrical in structure. Correspondingly, the slide grooves 221 also adopt a symmetrical arrangement to ensure that the movement of the sliders 120 in the slide grooves 221 is more stable. Each slider 120 will sequentially enter the two slide grooves 221 in a cycle.

[0023] Reference Figure 4 In addition, a circular arc edge 222 is designed to extend downward from the side of the slide groove 221. This design allows the slider 120 to slide more smoothly into the slide groove 221 along the circular arc edge 222, further optimizing the motion performance of the lifting mechanism. At the same time, the two adjacent circular arc edges 222 intersect to form a tip. When the tip stands on the top of the slider 120, it keeps the piston rod of the cylinder 300 in an extended state, at which point the lifting stops.

[0024] Reference Figure 3 To ensure the smooth sliding of the inner tube 100 within the outer tube 210, the outer tube assembly 200 is further equipped with a sliding sleeve 230. The sliding sleeve 230 is fixed within the second port 212 and is fitted onto the inner tube 100, reducing friction between the inner tube 100 and the outer tube 210 and improving the sliding effect.

[0025] Reference Figure 2 , 3 In addition, the outer tube assembly 200 is specially equipped with a push sleeve 240, which slides on the inner tube 100, and the position of the push sleeve 240 is between the sliding sleeve 230 and the slider 120.

[0026] During the process of the seat being lifted, the inner tube 100 is extended from the outer tube 210 by the cylinder 300. During the extension of the inner tube 100, the slider 120 pushes the push sleeve 240 towards the sliding sleeve 230. When the push sleeve 240 is clamped between the sliding sleeve 230 and the slider 120, the extension of the inner tube 100 from the outer tube 210 is stopped, thereby stopping the stroke of the piston rod of the cylinder 300 and maintaining the lifted state, thus preventing the inner tube 100 from coming out of the outer tube 210.

[0027] To prevent dust and other impurities from entering the inner cavity of the outer tube 210 and affecting the normal operation of the mechanism, the outer tube assembly 200 is also designed with a dust cover 250.

[0028] The dust cover 250 is fitted onto the inner tube 100. A connecting plate 213 is provided on the outer edge of the second port 212. The connecting plate 213 and the dust cover 250 are connected by a snap-fit ​​to ensure the stability of the dust cover 250. Specifically, the dust cover 250 has a locking block 251, and the connecting plate 213 has a corresponding locking slot 214. The locking block 251 is engaged in the locking slot 214, achieving a tight connection between the dust cover 250 and the connecting plate 213.

[0029] Meanwhile, the inner wall of the dust cover 250 is provided with an internal thread, and the outer wall of the connecting plate 213 is provided with an external thread. The internal thread and the external thread cooperate with each other, so that the dust cover 250 and the connecting plate 213 are connected by threads.

[0030] During the installation of cylinder 300, to improve installation efficiency and convenience, the sleeve 220 is provided with a first connecting hole 223, in which a first connecting screw is installed. This first connecting screw is connected to the tail end of cylinder 300. Simultaneously, the fixing plate 110 is provided with a second connecting hole 111, in which a second connecting screw is installed. This second connecting screw is connected to the piston rod of cylinder 300, ensuring the secure installation of cylinder 300. Furthermore, to further enhance the strength and stability of fixing plate 110, reinforcing ribs 112 are specially designed on fixing plate 110, improving the overall structural strength of fixing plate 110.

[0031] In the description of this specification, references to terms such as "some embodiments" or "as one might imagine" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one embodiment or example.

[0032] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A chair lifting mechanism, characterized in that, include: An inner tube (100) is provided with a fixing plate (110) welded to one end of the inner tube (100), the fixing plate (110) being connected to the seat, and a slider (120) being provided on the side wall of the other end of the inner tube (100). An outer tube assembly (200) is fitted over the inner tube (100). The outer tube assembly (200) includes an outer tube (210) and a sleeve (220). The outer tube (210) includes a first port (211) and a second port (212). The sleeve (220) is inserted into the first port (211). A groove (221) is formed on the sleeve (220) along the longitudinal direction. By rotating the outer tube (210), the slider (120) slides into the groove (221) or slides out of the groove (221). A cylinder (300) is inserted into the inner tube (100), the piston rod of the cylinder (300) is connected to the fixed plate (110), and the tail end of the cylinder (300) is connected to the sleeve (220).

2. The lifting mechanism of the chair according to claim 1, characterized in that, Two sliders (120) are used, and the two sliders (120) are symmetrically arranged. Two grooves (221) are also used, and the two grooves (221) are symmetrically arranged.

3. The lifting mechanism of the chair according to claim 2, characterized in that, The side of the groove (221) extends downward along the arc edge (222).

4. The lifting mechanism of the chair according to claim 1, characterized in that, The outer tube assembly (200) also includes a sliding sleeve (230), which is fixed inside the second port (212) and is slidably fitted onto the inner tube (100).

5. The lifting mechanism of the chair according to claim 4, characterized in that, The outer tube assembly (200) further includes a push sleeve (240), which is installed inside the outer tube (210) and fitted onto the inner tube (100), and the position of the push sleeve (240) is between the sliding sleeve (230) and the slider (120).

6. The lifting mechanism of the chair according to claim 4, characterized in that, The outer tube assembly (200) also includes a dust cover (250), which is fitted onto the inner tube (100). A connecting plate (213) is provided on the outer edge of the second port (212), and the connecting plate (213) is connected to the dust cover (250).

7. The lifting mechanism of the chair according to claim 6, characterized in that, The dust cover (250) is provided with a locking block (251), and the connecting plate (213) is provided with a locking slot (214), into which the locking block (251) is inserted.

8. The lifting mechanism of the chair according to claim 1, characterized in that, The sleeve (220) is provided with a first connecting hole (223), and a first connecting screw is installed in the first connecting hole (223). The first connecting screw is connected to the tail end of the cylinder (300).

9. The lifting mechanism of the chair according to claim 1, characterized in that, The fixing plate (110) is provided with a second connecting hole (111), and a second connecting screw is installed in the second connecting hole (111). The second connecting screw is connected to the piston rod of the cylinder (300).

10. The lifting mechanism of the chair according to claim 1, characterized in that, The fixing plate (110) is provided with reinforcing ribs (112).

Images