High stability seat lifting mechanism

Abstract

The application discloses a high-stability chair seat lifting mechanism, which comprises a movable pipe and a supporting seat, the supporting seat is provided with a movable groove extending in the vertical direction, and the inside of the supporting seat is provided with a vertical screw rod; the bottom of the movable pipe is provided with a connecting sleeve, the connecting sleeve is slidably connected to the supporting seat through the movable groove, the connecting sleeve is provided with an internal thread hole extending in the vertical direction, the screw rod is threadedly connected with the connecting sleeve through the internal thread hole, and the connecting sleeve and the supporting seat are relatively fixed in the circumferential direction; the screw rod comprises a bottom operating part, the operating part extends downward beyond the supporting seat, and the operating part is configured to adjust the screw rod to rotate. The high-stability chair seat lifting mechanism provided by the application is relatively fixed in the circumferential direction, and the seat cannot rotate; in addition, the operating part at the bottom of the rod extends beyond the supporting seat, the connecting sleeve, the supporting seat, the screw rod and the movable pipe can be closely matched, so that the chair seat lifting mechanism has good stability and is not prone to shaking.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a high-stability chair seat lifting mechanism. Background Technology

[0002] To accommodate users of various body types, most chairs on the market offer height adjustment. Common height adjustment mechanisms typically employ gas springs, connecting the seat and legs via a gas spring and a base. Users simply turn a handle on the base to activate a valve on the gas spring, making adjustment very convenient. Furthermore, the gas spring allows the seat to rotate freely in a horizontal position, providing greater flexibility.

[0003] There is also a type of study chair on the market designed for children. To improve children's concentration during learning, the seat of this chair needs to retain the height adjustment function while eliminating the swivel function. To solve this problem, existing study chairs typically add an aluminum alloy insert to the gas spring height adjustment mechanism. This insert restricts the rotation of the gas spring, allowing only height adjustment. However, in addition to purchasing the gas spring, the aluminum alloy insert also needs to be machined, resulting in high processing costs.

[0004] Therefore, to replace gas spring lifting mechanisms, existing screw lifting mechanisms for seating typically have an adjustment handle located on the side wall of the screw lifting mechanism. For example, a patented table and chair support mechanism and study table and chair (application number: CN202223500960.3) shows a drive mechanism connected to the top of the screw, which includes a first helical gear fixedly connected to the screw, a second helical gear meshing with the first helical gear, and a handle that drives the second helical gear to rotate. The handle passes through the lifting head and connects to the central axis of the second helical gear to drive the first helical gear to rotate, thereby driving the screw to rotate. This solution has a relatively simple overall structure and lower manufacturing costs compared to gas spring lifting mechanisms.

[0005] However, the above solution has the following problems: the handle passes through the lifting head and connects to the central axis of the second helical gear. Although it is convenient for the user to operate the handle to drive the lead screw to rotate, it will cause a gap in the radial direction between the lead screw and the lifting head, resulting in an insufficient fit. This will cause the seat to wobble easily and have poor stability. Summary of the Invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a highly stable chair seat lifting mechanism. With the help of the connecting sleeve and the support seat fixed in the circumferential direction, the movable tube is also fixed relative to the support seat in the circumferential direction. Therefore, there is no need to install an additional device to lock the seat rotation, ensuring that the seat always maintains a single orientation during use, thereby improving children's concentration during learning. Furthermore, the operating part at the bottom of the lead screw extends beyond the support seat, and in the radial direction, the connecting sleeve, support seat, lead screw, and movable tube can fit more tightly, thereby making the overall structure of the chair seat lifting mechanism more stable and less prone to shaking.

[0007] The effect of this utility model is achieved as follows: This application provides a highly stable chair seat lifting mechanism, including a movable tube and a support base. The movable tube is configured to connect to a chair seat assembly. The support base has a movable groove extending vertically, and a vertical lead screw is installed inside the support base. The lead screw can rotate circumferentially within the movable groove. A connecting sleeve is provided at the bottom of the movable tube. The connecting sleeve is slidably connected to the support base through the movable groove. The connecting sleeve has an internally threaded hole extending vertically. The lead screw is threadedly engaged with the connecting sleeve through the internally threaded hole. The connecting sleeve and the support base remain relatively fixed in the circumferential direction, so that when the lead screw rotates, the connecting sleeve is forced to slide up and down along the movable groove, thereby causing the movable tube to slide up and down relative to the support base. The lead screw includes an operating part at the bottom, which extends downward beyond the support base. The operating part is configured to adjust the rotation of the lead screw.

[0008] Furthermore, the lead angle of the lead screw is 5-7°, and when the lead screw is subjected to axial force, it remains relatively fixed in the vertical direction with the connecting sleeve. This results in good stability of the chair seat lifting mechanism, and the user only needs to turn the lead screw a few times to achieve a large lifting stroke of the movable cylinder, making adjustment easier and more convenient for children.

[0009] Furthermore, the movable tube has a tubular structure, including a frustoconical mounting section at the top, which is configured to engage with the conical opening of a universal tray. This makes the seat lifting mechanism highly compatible, thereby reducing the overall manufacturing cost of the chair.

[0010] Furthermore, the control unit is detachably connected to a handwheel via magnetic attraction. The handwheel is configured for the user to turn the lead screw. This not only simplifies the adjustment of the chair seat lifting mechanism, but also makes the assembly of the chair seat lifting mechanism easier, as the handwheel is detachably connected to the lead screw.

[0011] Furthermore, a handwheel is connected to the control unit. The handwheel is configured for the user to turn the lead screw. The handwheel has a recessed mounting hole, and the control unit is interference-fitted with the handwheel through the mounting hole. This not only simplifies the installation and operation of the handwheel but also ensures a high connection strength between the handwheel and the control unit.

[0012] Furthermore, the top of the connecting sleeve is recessed downwards to form an annular groove, through which the bottom of the movable tube engages with the connecting sleeve. This results in a tighter fit between the connecting sleeve and the movable tube in the radial direction, leading to higher connection strength and better stability.

[0013] Furthermore, the side wall of the connecting sleeve has a recessed mating hole that connects to the slot. A fixing hole is formed on the bottom side wall of the movable tube, aligned with the mating hole. The connecting sleeve and the movable tube are connected and fixed by a pin, with the pin and the mating hole and fixing hole having an interference fit. The pin connection further enhances the connection strength between the connecting sleeve and the movable tube, making the movable tube less prone to wobbling and improving the stability of the chair seat lifting mechanism.

[0014] Furthermore, the bottom of the slot is provided with several positioning protrusions, and the bottom of the movable tube is correspondingly recessed to form several positioning grooves. This makes the installation and positioning operation between the movable tube and the connecting sleeve simpler.

[0015] Furthermore, the hollow portion of the movable tube forms a connecting cavity, and the portion of the lead screw extending beyond the connecting sleeve passes into this cavity. A positioning element is fitted onto the top of the lead screw, with the width of the positioning element approaching the width of the connecting cavity. Thanks to this positioning element, the lead screw and the movable tube fit more tightly in the radial direction, resulting in a stronger connection and further enhancing the stability of the chair seat lifting mechanism.

[0016] Furthermore, a nest is embedded in the top of the support base, and a connecting hole is formed in the nest. The top of the movable tube is slidably connected to the nest through the connecting hole, and the diameter of the connecting hole is close to the diameter of the movable tube. This allows the nest to fill the gap between the support base and the movable tube in the radial direction, thereby increasing the connection strength between the two and further improving the stability of the chair seat lifting mechanism.

[0017] Furthermore, the nested sidewalls are provided with several inverted buckles, and the top sidewalls of the support base are correspondingly hollowed out to form several buckle grooves. The inverted buckles and buckle grooves engage with each other, allowing the nested unit to be secured to the support base. This makes the installation and disassembly of the nested unit relatively easy, while also ensuring a high connection strength between the nested unit and the support base, thus guaranteeing the stability of the chair seat lifting mechanism.

[0018] Furthermore, the connecting sleeve has a split structure, comprising two half-shells that are joined together. Each half-shell has a recessed portion on its adjacent side, which, when joined together, forms an internal threaded hole. This simplifies the assembly of the chair seat lifting mechanism.

[0019] The high-stability chair seat lifting mechanism provided in this application has a connecting sleeve and a lead screw threaded together, and the connecting sleeve and the support seat are relatively fixed in the circumferential direction, thereby converting the circumferential rotation of the lead screw into the vertical sliding of the connecting sleeve. The connection structure is simple, easy to process and manufacture, and the adjustment operation is very simple. Compared with the existing gas spring lifting mechanism, by means of the circumferential fixation of the connecting sleeve and the support seat, and the relative fixation of the movable tube and the support seat in the circumferential direction, there is no need to install an additional device to lock the seat rotation, ensuring that the seat always maintains a single orientation during use, thereby improving children's concentration in learning. Furthermore, the operating part at the bottom of the lead screw extends beyond the support base, allowing the user to adjust the lead screw by rotating the operating part exposed on the support base. No space needs to be reserved between the movable cylinder, support base, lead screw, and connecting sleeve for installing an additional adjustment mechanism. In other words, the connecting sleeve, support base, lead screw, and movable cylinder can fit together more tightly in the radial direction, resulting in better overall structural stability of the chair seat lifting mechanism and making it less prone to shaking. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A three-dimensional structural diagram of the chair seat lifting mechanism provided in an embodiment of this application; Figure 2 This is a schematic diagram of the connection structure between the support base and the connecting sleeve provided in an embodiment of this application; Figure 3 A cross-sectional structural diagram of the seat lifting mechanism at the lowest position, provided for an embodiment of this application; Figure 4 A cross-sectional structural diagram of the seat lifting mechanism at the highest position, provided for an embodiment of this application; Figure 5 This is a schematic diagram of the connection structure between the active tube and the connecting sleeve provided in an embodiment of this application; Figure 6 This is a schematic diagram of the connection structure between the connecting sleeve and the lead screw provided in an embodiment of this application; Figure 7 A three-dimensional structural diagram of a universal tray provided for existing technology.

[0021] The reference numerals in the attached figures are as follows: 1-movable tube, 101-fixed hole, 102-positioning groove, 103-connecting cavity, 110-mounting part, 2-support base, 201-movable groove, 202-snap groove, 3-lead screw, 310-operating part, 320-positioning part, 4-connecting sleeve, 4a-half shell, 401-internal threaded hole, 402-slot, 403-butting hole, 404-positioning protrusion, 405-splitting protrusion, 406-splitting interface, 5-handwheel, 501-mounting hole, 6-nesting, 601-connecting hole, 610-inverted snap, 7-chair leg, 8-universal tray, 801-conical opening. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0023] Please refer to the attached document. Figure 1-6 This application provides a high-stability chair seat lifting mechanism, including a movable tube 1 and a support base 2. The movable tube 1 is configured to connect to a chair seat assembly. The support base 2 has a movable groove 201 extending in the vertical direction. A vertical lead screw 3 is provided inside the support base 2. The lead screw 3 can rotate in the movable groove 201 in its circumference. A connecting sleeve 4 is provided at the bottom of the movable tube 1. The connecting sleeve 4 is slidably connected to the support base 2 through the movable groove 201. The connecting sleeve 4 has an internal threaded hole 401 extending in the vertical direction. The lead screw 3 is threadedly engaged with the connecting sleeve 4 through the internal threaded hole 401. The connecting sleeve 4 and the support base 2 remain relatively fixed in the circumferential direction, so that when the lead screw 3 rotates, the connecting sleeve 4 is forced to slide up and down along the movable groove 201, thereby driving the movable tube 1 to slide up and down relative to the support base 2. The lead screw 3 includes an operating part 310 at the bottom, which extends downward beyond the support base 2. The operating part 310 is configured to adjust the rotation of the lead screw 3.

[0024] In this embodiment, please refer to the appendix. Figure 3-4 The connecting sleeve 4 and the lead screw 3 are threaded together, and the connecting sleeve 4 and the support seat 2 are relatively fixed in the circumferential direction. This converts the circumferential rotation of the lead screw 3 into the vertical sliding of the connecting sleeve 4. The connection structure is simple, easy to manufacture, and very convenient to adjust. Compared with the existing gas spring lifting mechanism, the connecting sleeve 4 and the support seat 2 are circumferentially fixed, and the movable tube 1 is also relatively fixed in the circumferential direction with the support seat 2. Therefore, there is no need to install an additional device to lock the seat's direction, ensuring that the seat always maintains a single orientation during use and improving children's concentration during learning.

[0025] Furthermore, the operating part 310 at the bottom of the lead screw 3 extends beyond the support base 2, allowing the user to adjust the lead screw 3 by rotating the operating part 310 exposed on the support base 2. Compared to the existing patent for a table and chair support mechanism and a study table and chair (application number: CN202223500960.3), no space needs to be reserved between the movable cylinder 1, support base 2, lead screw 3, and connecting sleeve 4 to install an additional adjustment mechanism. That is, in a radial manner, the connecting sleeve 4, support base 2, lead screw 3, and movable cylinder 1 can fit together more tightly, resulting in better overall structural stability of the chair seat lifting mechanism and making it less prone to wobbling.

[0026] The connection sleeve 4 and the support base 2 are kept relatively fixed in the circumferential direction as follows: the cross-section of the support base 2 is a square structure, and the connection sleeve 4 is also a square structure with a matching shape, so that the connection sleeve 4 is stuck into the movable groove 201 and cannot make circumferential movement. Thus, when the lead screw 3 rotates, the connection sleeve 4 is forced to slide up and down in the vertical direction.

[0027] The chair seat lifting mechanism also includes chair legs 7. The chair legs 7 are made of tubular parts by bending and processing, which has a low processing and manufacturing cost. The support base 2 is welded and mounted on the top of the chair legs 7, so that the bottom of the support base 2 and the ground have a certain distance, which makes it easy to install the handwheel 5 to operate the screw 3 to rotate.

[0028] Please refer to the attached document. Figure 3-4 In some embodiments of this application, the lead angle of the lead screw 3 is 5-7°, and when the lead screw 3 is subjected to axial force, it is fixed relative to the connecting sleeve 4 in the vertical direction.

[0029] In this embodiment, the lead screw lifting mechanism of existing commercially available seating has the following problems: When the lead screw has a large lead angle, the user only needs to turn the lead screw a few times to achieve a large lifting stroke, making it easy for children with limited strength to adjust. However, when the lead screw is subjected to axial pressure, it is prone to rotation, causing the seat to slowly descend over time, requiring repeated adjustments and resulting in poor stability. Conversely, when the lead screw has a small lead angle, although it is less prone to rotation under axial force and has lower stability, the user needs to turn the lead screw a large number of times to control the lifting mechanism. This makes adjustment very difficult for children, who cannot perform the adjustment independently. Therefore, the lead angle of the lead screw 3 provided in this embodiment is between 5-7°, which is a moderate size. On the one hand, when the lead screw 3 is subjected to pressure in the axial direction, the lead screw 3 will not rotate, which makes the stability of the seat lifting mechanism better. On the other hand, the user only needs to turn the lead screw 3 a few turns, and the movable cylinder 1 can also be raised and lowered by a large stroke. The adjustment operation is more effortless and convenient for children.

[0030] Preferably, the lead angle of the lead screw 3 provided in this embodiment is 6.18°. The lead angle is moderate, which not only makes the chair lifting mechanism more stable, but also makes the adjustment operation of the chair lifting mechanism more labor-saving and convenient.

[0031] Please refer to the attached document. Figure 1 and attached Figure 7 In some embodiments of this application, the active tube 1 is a tubular structure, including a frustoconical mounting portion 110 at the top, which is configured to engage with the tapered opening 801 of the universal tray 8.

[0032] To replace the gas spring lifting mechanism, existing patents also provide a height-adjustable chair leg for a study chair (application number: CN202421884661.0). This includes a pair of feet, each consisting of a mounting foot inclined to the ground and a support foot fixed to the side of the mounting foot and resting on the ground. The top of the support foot has a sliding, telescopic frame capable of multi-level height adjustment. Height adjustment is achieved through a mechanism that uses a return bolt on an adjustment knob to elastically engage with and limit the adjustment groove. A mounting bracket parallel to the ground is fixed to the side of the telescopic frame. Compared to the gas spring lifting mechanism, this solution has lower manufacturing costs. However, the above solution has the following problems: the telescopic frame is connected to the bottom of the chair seat via the mounting bracket. To ensure the stability of the study chair, a frame matching the mounting bracket needs to be added to the bottom of the chair seat and fixed with screws. In other words, the chair legs of the aforementioned study chairs can only be compatible with a single type of chair seat. Manufacturers need to design and manufacture study chair legs separately for different chair seat models, resulting in poor compatibility of study chair legs and higher costs when manufacturing multiple models of study chairs.

[0033] In this embodiment, please refer to the appendix. Figure 7 The figure shows a common universal tray 8 for pneumatic rods on the market. The bottom of this universal tray 8 has a conical opening 801. Traditional pneumatic rod cylinders have a truncated cone-shaped top, allowing the universal tray 8 to engage with various types of pneumatic rods via the conical opening 801. Similarly, by setting the top of the movable tube 1 as a truncated cone-shaped mounting part 110, the structure of the movable tube 1 is similar to that of a traditional pneumatic rod cylinder. The movable tube 1 can engage with the conical opening 801 on the universal tray 8 via the mounting part 110. Compared to an existing patent for a height-adjustable study chair leg (application number: CN202421884661.0), the chair seat lifting mechanism provided in this solution does not require a separate connection structure on the chair seat. For various chair models, only a universal tray 8 needs to be installed at the bottom of the chair seat to engage and fix it with the movable tube 1 on the chair seat lifting mechanism. This makes the chair seat lifting mechanism highly compatible, thereby reducing the overall manufacturing cost of the chair.

[0034] Please refer to the attached document. Figure 1-2 In some embodiments of this application, the operating unit 310 is detachably connected to a handwheel 5 via magnetic attraction. The handwheel 5 is configured for the user to turn the lead screw 3. This not only simplifies the adjustment of the chair seat lifting mechanism, but also makes the assembly of the chair seat lifting mechanism more convenient. Furthermore, when the chair seat height does not need to be adjusted, the handwheel 5 can be removed and stored, making the use of the chair seat lifting mechanism even more convenient.

[0035] Of course, in other embodiments of this application, the connection between the handwheel 5 and the lead screw 3 can also be a screw connection, a pin connection, etc.

[0036] Please refer to the attached document. Figure 1-2 In some embodiments of this application, a handwheel 5 is connected to the operating part 310. The handwheel 5 is configured for the user to turn the lead screw 3 for rotation. A mounting hole 501 is recessed on the handwheel 5. The operating part 310 and the handwheel 5 are interference-fitted through the mounting hole 501.

[0037] In this embodiment, the handwheel 5 and the operating part 310 are fixed by interference fit, which not only makes the installation and operation of the handwheel 5 simpler, but also makes the connection strength between the handwheel 4 and the operating part 310 higher. During the use of the seat, the handwheel 4 is not easy to fall off and has good stability.

[0038] Please refer to the attached document. Figure 5 In some embodiments of this application, the top of the connecting sleeve 4 is recessed downward to form an annular groove 402, and the bottom of the movable tube 1 is engaged with the connecting sleeve 4 through the groove 402. This makes the connecting sleeve 4 and the movable tube 1 fit more tightly in the radial direction, resulting in higher connection strength and better stability.

[0039] Please refer to the attached document. Figure 5 In some embodiments of this application, the sidewall of the connecting sleeve 4 is recessed to form a mating hole 403, which connects to the slot 402. A fixing hole 101 is hollowed out on the sidewall at the bottom of the movable tube 1, aligning with the mating hole 403. The connecting sleeve 4 and the movable tube 1 are connected and fixed by a pin, with the pin and the mating hole 403 and fixing hole 101 having an interference fit. The connection between the connecting sleeve 4 and the movable tube 1 via the pin further enhances the connection strength, making the movable tube 1 less prone to wobbling and improving the stability of the chair seat lifting mechanism.

[0040] Preferably, the connecting sleeve 4 has mating holes 403 at both ends, and the movable tube 1 has two corresponding fixing holes 101 on the left and right sides. That is, the connecting sleeve 4 and the movable tube 1 are connected and fixed by two sets of pins on the left and right sides, which further enhances the connection strength between the two.

[0041] Please refer to the attached document. Figure 5 In some embodiments of this application, the bottom of the slot 402 is provided with a plurality of positioning protrusions 404, and the bottom of the movable tube 1 is correspondingly recessed to form a plurality of positioning grooves 102.

[0042] In this embodiment, when the movable tube 1 is aligned with the slot 402 and engaged with the connecting sleeve 4, the positioning protrusion 404 engages with the positioning groove 102, thereby correcting the orientation of the movable tube 1 so that the mating hole 403 is precisely aligned with the fixing hole 101, thus facilitating the subsequent insertion of the pin. This makes the installation and positioning operation between the movable tube 1 and the connecting sleeve 4 much simpler.

[0043] Preferably, the bottom of the slot 402 is provided with two symmetrical positioning protrusions 401, and the bottom of the movable tube 1 is provided with two corresponding positioning grooves 102, so that the positioning operation between the two is more stable.

[0044] Please refer to the attached document. Figure 3 and attached Figure 6 In some embodiments of this application, the hollow portion of the movable tube 1 forms a connecting cavity 103, the portion of the top of the lead screw 3 extending beyond the connecting sleeve 4 passes into the connecting cavity 103, and a positioning member 320 is sleeved on the top of the lead screw 3, the width of the positioning member 320 being close to the width of the connecting cavity 103.

[0045] In this embodiment, by attaching a positioning member 320 to the top of the lead screw 3, during the lifting and lowering process of the chair seat lifting mechanism, the lead screw 3 slides up and down relative to the movable tube 1 along the connecting cavity 103. With the help of the positioning member 320 at the top, the lead screw 3 and the movable tube 1 fit more tightly in the radial direction, thereby making the connection strength between the lead screw 3 and the movable tube 1 higher. The movable tube 1 is less likely to shake during the lifting and lowering process, thereby further improving the stability of the chair seat lifting mechanism.

[0046] Please refer to the attached document. Figure 1-2 In some embodiments of this application, the top of the support base 2 is embedded with a nest 6, and a connecting hole 601 is formed on the nest 6. The top of the movable tube 1 is slidably connected to the nest 6 through the connecting hole 601, and the diameter of the connecting hole 601 is close to the diameter of the movable tube 1.

[0047] In this embodiment, the support base 2 and the movable tube 1 have different shapes. By setting a nest 6 on the support base 2, the movable tube 1 passes through the connecting hole 601 into the nest 6, so that the gap between the support base 2 and the movable tube 1 in the radial direction is made up by the nest 6, thereby making the connection strength between the two higher. The movable tube 1 is less likely to shake during the lifting process, further improving the stability of the chair seat lifting mechanism.

[0048] Please refer to the attached document. Figure 1-2In some embodiments of this application, the sidewall of the nest 6 is provided with several inverted buckles 610, and the sidewall of the top of the support base 2 is correspondingly hollowed out to form several buckle grooves 202. The inverted buckles 610 and the buckle grooves 202 engage with each other, so that the nest 6 is snapped onto the support base 2. Installing the nest 6 by engaging the inverted buckles 610 and the buckle grooves 202 makes the installation and disassembly of the nest 6 relatively simple, and at the same time makes the connection strength between the nest 6 and the support base 2 high, ensuring the stability of the chair seat lifting mechanism.

[0049] Please refer to the attached document. Figure 6 In some embodiments of this application, the connecting sleeve 4 is a split structure, including two half-shells 4a spliced ​​together. The two half-shells 4a are recessed on the side that is close to each other. When the two half-shells 4a are spliced ​​together, the recessed parts combine to form an internal threaded hole 401.

[0050] In this embodiment, when assembling the chair seat lifting structure, the connecting sleeve 4 is first disassembled into two half-shells 4a. The two half-shells 4a are placed on the left and right sides of the lead screw 3, respectively. When the two half-shells 4a are spliced ​​together, the connecting sleeve 4 is assembled and the lead screw 3 is sandwiched in the middle. Then, the movable tube 1 is inserted into the slot 402 on the connecting sleeve 4. The positioning slot 102 on the movable tube 1 and the positioning protrusion 404 on the connecting sleeve 4 are engaged and fixed, so that the fixing hole 101 on the movable tube 1 is exactly aligned with the docking hole 403 on the side wall of the connecting sleeve 4. A pin is driven into the docking hole 403, thereby assembling and fixing the lead screw 3, the movable tube 1, and the connecting sleeve 4. Finally, the assembled connecting sleeve 4 is inserted into the movable slot 201 on the support base 2, and the nest 6 is embedded in the top of the support base 2. The mounting part 110 at the top of the movable tube 1 passes through the connecting hole 601 on the nest 6 and is exposed in the support base 2. The bottom of the lead screw 3 passes through the bottom of the support base 2, and a handwheel 5 is installed on the support base 2. Thus, the chair seat lifting structure is assembled as a whole. The connecting sleeve 4 is designed as a split structure, which makes the assembly of the seat lifting mechanism easier.

[0051] Preferably, one half-shell 4a has multiple splicing protrusions 405 protruding on its splicing surface, and the other half-shell 4a has multiple splicing interfaces 406 recessed on its splicing surface. When the two half-shells 4a are spliced ​​together, the multiple sets of splicing protrusions 405 and splicing interfaces 406 are snapped together to ensure that the two half-shells 4a can be assembled together in the correct orientation, thereby improving the ease of assembly of the connecting sleeve 4.

[0052] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means three or more.

[0053] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A highly stable chair seat lifting mechanism, characterized in that, The assembly includes a movable tube (1) and a support base (2). The movable tube (1) is configured to connect to a chair seat assembly. The support base (2) has a movable groove (201) extending vertically. A vertical lead screw (3) is installed inside the support base (2), and the lead screw (3) can rotate circumferentially within the movable groove (201). A connecting sleeve (4) is installed at the bottom of the movable tube (1). The connecting sleeve (4) is slidably connected to the support base (2) through the movable groove (201). The connecting sleeve (4) has an internally threaded hole (401) extending vertically. The lead screw (3) is threadedly engaged with the connecting sleeve (4) through the internal threaded hole (401). The connecting sleeve (4) and the support seat (2) are relatively fixed in the circumferential direction, so that when the lead screw (3) rotates, the connecting sleeve (4) is forced to slide up and down along the movable groove (201), thereby driving the movable tube (1) to slide up and down relative to the support seat (2). The lead screw (3) includes an operating part (310) at the bottom, which extends downward beyond the support seat (2). The operating part (310) is configured to adjust the lead screw (3) to rotate.

2. The high-stability chair seat lifting mechanism according to claim 1, characterized in that, The lead angle of the lead screw (3) is 5-7°. When the lead screw (3) is subjected to axial force, it is fixed relative to the connecting sleeve (4) in the vertical direction.

3. The high-stability chair seat lifting mechanism according to claim 1, characterized in that, The active tube (1) is a tubular structure, including a frustoconical mounting part (110) at the top, which is configured to engage with the conical opening (801) of the universal tray (8).

4. The high-stability chair seat lifting mechanism according to claim 1, characterized in that, The control unit (310) is detachably connected to a handwheel (5) by magnetic attraction, and the handwheel (5) is configured for the user to turn the lead screw (3) for rotation.

5. The high-stability chair seat lifting mechanism according to claim 1, characterized in that, The control unit (310) is connected to a handwheel (5), which is configured for the user to turn the lead screw (3) for rotation. The handwheel (5) is recessed with a mounting hole (501), and the control unit (310) and the handwheel (5) are interference-fitted through the mounting hole (501).

6. The high-stability chair seat lifting mechanism according to claim 1, characterized in that, The top of the connecting sleeve (4) is recessed downward to form an annular groove (402), and the bottom of the movable tube (1) is engaged with the connecting sleeve (4) through the groove (402).

7. The high-stability chair seat lifting mechanism according to claim 6, characterized in that, The side wall of the connecting sleeve (4) is recessed to form a docking hole (403), which is connected to the slot (402). The bottom side wall of the movable tube (1) is hollowed out to form a fixing hole (101), which is aligned with the docking hole (403). The connecting sleeve (4) and the movable tube (1) are connected and fixed by a pin, and the pin, the docking hole (403), and the fixing hole (101) are interference fit.

8. The high-stability chair seat lifting mechanism according to claim 6, characterized in that, The bottom of the slot (402) is provided with several positioning protrusions (404), and the bottom of the movable tube (1) is correspondingly recessed to form several positioning grooves (102).

9. The high-stability chair seat lifting mechanism according to claim 1, characterized in that, The hollow part of the movable tube (1) forms a connecting cavity (103). The part of the top of the lead screw (3) that extends beyond the connecting sleeve (4) enters the connecting cavity (103). The top of the lead screw (3) is fitted with a positioning member (320). The width of the positioning member (320) is close to the width of the connecting cavity (103).

10. The high-stability chair seat lifting mechanism according to claim 1, characterized in that, The top of the support base (2) is fitted with a nest (6), and a connecting hole (601) is formed on the nest (6). The top of the movable tube (1) is slidably connected to the nest (6) through the connecting hole (601), and the diameter of the connecting hole (601) is close to the diameter of the movable tube (1).

11. The high-stability chair seat lifting mechanism according to claim 10, characterized in that, The side wall of the nest (6) is provided with several buckles (610), and the side wall of the top of the support base (2) is correspondingly hollowed out to form several buckle grooves (202). The buckles (610) and the buckle grooves (202) are engaged to make the nest (6) engage with the support base (2).

12. The high-stability chair seat lifting mechanism according to claim 1, characterized in that, The connecting sleeve (4) is a split structure, including two half-shells (4a) spliced ​​together on the left and right. The two half-shells (4a) are formed with recessed parts on the side that is close to each other. When the two half-shells (4a) are spliced ​​together, the recessed parts are combined to form the internal threaded hole (401).

Images