A lifting desk and chair

Abstract

A lifting desk comprises: a desktop, a base, and a lifting mechanism; the lifting mechanism comprises: a sleeve, an upper screw rod and a lower screw rod; the sleeve is connected from top to bottom, the upper screw rod extends from the top end of the sleeve and is threadedly connected to the upper end of the sleeve; the lower screw rod extends from the bottom end of the sleeve and is threadedly connected to the lower end of the sleeve; the lower screw rod is hollow, and the upper screw rod can extend into the lower screw rod; a first clamping structure is provided near the top of the sleeve; a second clamping structure is provided at the bottom end of the upper screw rod; when the second clamping structure rotates and rises to the top of the sleeve, it cooperates with the first clamping structure, and the sleeve rotates with the upper screw rod; when the sleeve descends to the top end of the lower screw rod and abuts against the first clamping structure, the first clamping structure is separated from the second clamping structure, and the upper screw rod rotates and descends deep into the lower screw rod; it has a large adjustment range and strong applicability, avoiding problems such as double inventory of educational resources; at the same time, the adjustment process is simple, which is conducive to user operation.

Description

Technical Field

[0001] The present invention generally relates to the technical field of liftable equipment, and in particular to a liftable desk and chair. Background Art

[0002] Existing liftable desks and chairs usually achieve the lifting function by an upper support with positioning holes and a lower support with fixing holes. The connection method is mostly bolt or slide installation and fixing, and the adjustment process is relatively complicated, resulting in the lifting function of many products being ignored during use; on the other hand, they are composed of a single wire shaft and a matching fixed nut, with a small lifting range and no universality, which leads to a waste of school desk and chair resources and increases the company's inventory quantity. Summary of the invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a lifting desk and chair with a three-section lifting function, a simple adjustment process, a large lifting range, and good safety performance.

[0004] A first aspect of the present application provides a lifting desk comprising: a desktop, a base and a lifting mechanism;

[0005] The lifting mechanism comprises: a sleeve, an upper screw rod and a lower screw rod; the sleeve is through-through, the top end of the upper screw rod extends from the top end of the sleeve and is threadedly connected with the upper end of the sleeve; the lower screw rod extends from the bottom end of the sleeve and is threadedly connected with the lower end of the sleeve; the lower screw rod is hollow, and the upper screw rod can extend into the lower screw rod;

[0006] A first clamping structure is provided in the sleeve near the top; the bottom end of the upper screw rod is connected to a second clamping structure that can cooperate with the first clamping structure;

[0007] When the second clamping structure rises to the first clamping structure as the upper screw rod rotates, the second clamping structure cooperates with the first clamping structure, so that the sleeve rotates together with the upper screw rod;

[0008] When the sleeve rotates around the lower screw rod and descends until the top of the lower screw rod abuts against the first clamping structure, the first clamping structure is separated from the second clamping structure, so that the upper screw rod rotates and descends and continues to penetrate into the lower screw rod;

[0009] The desktop is installed at the top of the upper screw rod; there is at least one lifting mechanism, and the lifting mechanisms are symmetrically distributed corresponding to the desktop; the base is correspondingly installed at the lower end of the lower screw rod.

[0010] According to the technical solution provided in the embodiment of the present application, a driving mechanism for driving the upper screw rod to rotate is installed at the upper end of the upper screw rod; the driving mechanism includes: a gear box, a bevel gear, a driving shaft, and a driving device;

[0011] The gear box is installed at the bottom of the desktop; a through hole is provided on the side wall of the gear box, one end of the drive shaft passes through the gear box from the through hole, and the drive shaft is driven to rotate by the drive device; a positioning hole is provided on the bottom surface of the gear box, and the top end of the upper screw rod is installed inside the gear box through the positioning hole; the drive shaft is connected to the top end of the upper screw rod through a group of bevel gears.

[0012] According to the technical solution provided in the embodiment of the present application, the lifting mechanism is further provided with a shell; the shell is installed outside the lifting mechanism, and includes: an upper shell, a middle shell, a lower shell, an upper center sleeve, and a lower center sleeve;

[0013] The top of the upper housing is mounted on the bottom of the gear box; the bottom of the upper housing is mounted with an upper center sleeve, which can be extended into the middle housing along with the upper housing; the middle housing can be extended into the lower housing; the middle housing is mounted with a lower center sleeve, which can be extended into the lower housing along with the middle housing; the bottom of the lower housing is mounted on the base;

[0014] A first card slot is provided near the top of the middle shell, at least one n-shaped slot is provided on the side wall of the upper center sleeve, and first buckles corresponding to the first card slot are provided on both sides of the upper center sleeve;

[0015] A second card slot is provided in the lower shell near the top, and second buckles corresponding to the second card slot are provided on both sides of the lower center sleeve.

[0016] According to the technical solution provided in the embodiment of the present application, the driving device is a crank or a stepping motor.

[0017] According to the technical solution provided in the embodiment of the present application, there are several lifting mechanisms, and the lifting mechanisms are arranged in an array; the driving shafts of the arranged lifting mechanisms are shared.

[0018] According to the technical solution provided in the embodiment of the present application, the number of the lifting mechanisms is several, and the several lifting mechanisms are arranged in an array; the tops of the upper screw rods of the arranged lifting mechanisms are connected by a horizontally arranged first cross bar; the bottoms of the lower screw rods of the arranged lifting mechanisms are connected by a horizontally arranged second cross bar.

[0019] According to the technical solution provided in the embodiment of the present application, the first clamping structure includes: an engaging inner sleeve, an engaging outer sleeve, a return spring, and a clamping spring;

[0020] The meshing outer sleeve is fixed inside the sleeve; a retaining spring is installed near the bottom of the meshing outer sleeve; the meshing inner sleeve is sleeved inside the meshing outer sleeve; the meshing inner sleeve has an upper structure and a lower structure, the upper part of the meshing inner sleeve is meshed and connected with the meshing outer sleeve, and the lower part of the meshing inner sleeve can pass through the retaining spring, so that the retaining spring abuts against the upper part of the meshing inner sleeve;

[0021] The meshing inner sleeve has a polygonal inner wall; the second clamping structure has a corresponding polygonal outer wall, and the length of the second clamping structure is less than the length of the lower part of the meshing inner sleeve;

[0022] The return spring is sleeved outside the upper screw rod and is located between the engagement inner sleeve and the upper end of the sleeve, and the diameter of the return spring is larger than the outer diameter of the engagement inner sleeve;

[0023] The outer diameter of the lower screw rod is larger than the inner diameter of the lower portion of the meshing inner sleeve, and the inner diameter of the lower screw rod is smaller than the outer diameter of the lower portion of the meshing outer sleeve.

[0024] According to the technical solution provided in the embodiment of the present application, an upper threaded sleeve is installed in the upper port of the sleeve, and the upper screw rod is threadedly connected to the upper threaded sleeve; a lower threaded sleeve is installed in the lower port of the sleeve; and the lower threaded sleeve is threadedly connected to the lower screw rod.

[0025] According to the technical solution provided in the embodiment of the present application, a table drawer is installed under the table top; and school bag hooks are installed on both sides of the gear box.

[0026] A second aspect of the present application provides a lifting classroom chair comprising: a chair seat, a base and a lifting mechanism;

[0027] The lifting mechanism comprises: a sleeve, an upper screw rod and a lower screw rod; the sleeve is through-through, the top end of the upper screw rod extends from the top end of the sleeve and is threadedly connected with the upper end of the sleeve; the lower screw rod extends from the bottom end of the sleeve and is threadedly connected with the lower end of the sleeve; the lower screw rod is hollow, and the upper screw rod can extend into the lower screw rod;

[0028] A first clamping structure is provided in the sleeve near the top; the bottom end of the upper screw rod is connected to a second clamping structure that can cooperate with the first clamping structure;

[0029] When the second clamping structure rises to the first clamping structure as the upper screw rod rotates, the second clamping structure cooperates with the first clamping structure, so that the sleeve rotates together with the upper screw rod;

[0030] When the sleeve rotates around the lower screw rod and descends until the top of the lower screw rod abuts against the first clamping structure, the first clamping structure is separated from the second clamping structure, so that the upper screw rod rotates and descends and continues to penetrate into the lower screw rod;

[0031] The seat surface is installed at the top end of the upper screw rod; there is at least one lifting mechanism, and the lifting mechanisms are symmetrically distributed corresponding to the seat surface; the base is correspondingly installed at the lower end of the lower screw rod.

[0032] According to the technical solution provided in the embodiment of the present application, a driving mechanism for driving the upper screw rod to rotate is installed at the upper end of the upper screw rod; the driving mechanism includes: a gear box, a bevel gear, a driving shaft, and a driving device;

[0033] The gear box is installed at the bottom of the seat surface; a through hole is provided on the side wall of the gear box, one end of the drive shaft passes through the gear box from the through hole, and the drive shaft is driven to rotate by the drive device; a positioning hole is provided on the bottom surface of the gear box, and the top end of the upper screw rod is installed inside the gear box through the positioning hole; the drive shaft is connected to the top end of the upper screw rod through a group of bevel gears.

[0034] According to the technical solution provided in the embodiment of the present application, the lifting mechanism is further provided with a shell; the shell is installed outside the lifting mechanism, and includes: an upper shell, a middle shell, a lower shell, an upper center sleeve, and a lower center sleeve;

[0035] The top of the upper housing is mounted on the bottom of the gear box; the bottom of the upper housing is mounted with an upper center sleeve, which can be extended into the middle housing along with the upper housing; the middle housing can be extended into the lower housing; the middle housing is mounted with a lower center sleeve, which can be extended into the lower housing along with the middle housing; the bottom of the lower housing is mounted on the base;

[0036] A first card slot is provided near the top of the middle shell, at least one n-shaped slot is provided on the side wall of the upper center sleeve, and first buckles corresponding to the first card slot are provided on both sides of the upper center sleeve;

[0037] A second card slot is provided in the lower shell near the top, and second buckles corresponding to the second card slot are provided on both sides of the lower center sleeve.

[0038] According to the technical solution provided in the embodiment of the present application, the driving device is a crank or a stepping motor.

[0039] According to the technical solution provided in the embodiment of the present application, there are several lifting mechanisms, and the lifting mechanisms are arranged in an array; the driving shafts of the arranged lifting mechanisms are shared.

[0040] According to the technical solution provided in the embodiment of the present application, the number of the lifting mechanisms is several, and the several lifting mechanisms are arranged in an array; the tops of the upper screw rods of the arranged lifting mechanisms are connected by a horizontally arranged first cross bar; the bottoms of the lower screw rods of the arranged lifting mechanisms are connected by a horizontally arranged second cross bar.

[0041] According to the technical solution provided in the embodiment of the present application, the first clamping structure includes: an engaging inner sleeve, an engaging outer sleeve, a return spring, and a clamping spring;

[0042] The meshing outer sleeve is fixed inside the sleeve; a retaining spring is installed near the bottom of the meshing outer sleeve; the meshing inner sleeve is sleeved inside the meshing outer sleeve; the meshing inner sleeve has an upper structure and a lower structure, the upper part of the meshing inner sleeve is meshed and connected with the meshing outer sleeve, and the lower part of the meshing inner sleeve can pass through the retaining spring, so that the retaining spring abuts against the upper part of the meshing inner sleeve;

[0043] The meshing inner sleeve has a polygonal inner wall; the second clamping structure has a corresponding polygonal outer wall, and the length of the second clamping structure is less than the length of the lower part of the meshing inner sleeve;

[0044] The return spring is sleeved outside the upper screw rod and is located between the engagement inner sleeve and the upper end of the sleeve, and the diameter of the return spring is larger than the outer diameter of the engagement inner sleeve;

[0045] The outer diameter of the lower screw rod is larger than the inner diameter of the lower portion of the meshing inner sleeve, and the inner diameter of the lower screw rod is smaller than the outer diameter of the lower portion of the meshing outer sleeve.

[0046] According to the technical solution provided in the embodiment of the present application, an upper threaded sleeve is installed in the upper port of the sleeve, and the upper screw rod is threadedly connected to the upper threaded sleeve; a lower threaded sleeve is installed in the lower port of the sleeve; and the lower threaded sleeve is threadedly connected to the lower screw rod.

[0047] According to the technical solution provided in the embodiment of the present application, a backrest is installed on one side of the chair surface.

[0048] On the one hand, the lifting desk provided by the present application includes: a desktop, a base and a lifting mechanism; on the other hand, the present application also provides a lifting chair, including: a chair surface, a base and a lifting mechanism; wherein the lifting mechanism includes: a sleeve, an upper screw rod and a lower screw rod, wherein the upper screw rod is connected to the upper end of the sleeve by a thread, and the lower screw rod is connected to the lower end of the sleeve by a thread; a first clamping structure is provided near the top of the sleeve; a second clamping structure that can cooperate with the first clamping structure is provided at the bottom end of the upper screw rod, so that the upper screw rod and the sleeve can be combined and separated, that is, the upper screw rod can drive the sleeve to rotate together, so that the lower screw rod can be extended into or extended out of the sleeve; it can also rotate alone to realize the upper screw rod extending into or extending out of the sleeve, thereby realizing the lifting function of the desk and the chair; specifically:

[0049] During the ascending process, the upper screw is rotated to make it rotate and ascend around the sleeve inside the lower screw. When the second clamping structure rises to the first clamping structure along with the rotation of the upper screw, it cooperates with the first clamping structure to make the sleeve rotate and ascend around the lower screw together with the upper screw.

[0050] During the descent process, when the sleeve is rotated and descended with the lower screw rod until the top end of the lower screw rod abuts against the first clamping structure, the second clamping structure is separated from the first clamping structure, so that the upper screw rod rotates and descends and continues to penetrate into the lower screw rod;

[0051] Thereby, the adjustable height is achieved to reach the sum of the lengths of the two lifting mechanisms (upper screw and lower screw), that is, a large lifting space is realized, and the scope of application is wider and broader, which meets the adjustability of the same chair in different classes, increases applicability, and reduces the waste of double inventory of educational resources for distinguishing the sizes of chairs to meet the needs of different students with different heights; at the same time, the lifting and lowering of the entire lifting mechanism can be achieved only by driving the rotation of the upper screw, and the adjustment process is simple, which is more conducive to user operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0053] Figure 1 This is the front view of the lift desk;

[0054] Figure 2 is a front view of the lifting chair;

[0055] Figure 3 for Figure 1 , Figure 2 A front view of the lifting mechanism shown;

[0056] Figure 4 for Figure 1 , Figure 2 A three-dimensional assembly diagram of the lifting mechanism shown;

[0057] Figure 5 for Figure 1 , Figure 2 A schematic cross-sectional view of the driving mechanism shown;

[0058] Figure 6 for Figure 4 A partial enlarged view of part A shown;

[0059] Figure 7 for Figure 4 A partial enlarged view of portion B shown;

[0060] Figure 8 for Figure 1 , Figure 2 A schematic cross-sectional view of the meshing inner sleeve and the meshing outer sleeve shown;

[0061] Fig. 9 for Figure 1 , Figure 2 A three-dimensional assembly diagram of the housing shown;

[0062] Fig.10 for Fig. 9 A partial enlarged view of portion C shown;

[0063] Fig.11 for Fig. 9 A partial enlarged view of portion D shown;

[0064] Fig.12 for Figure 1 , Figure 2 The cross-sectional structural diagram of the lifting mechanism shown;

[0065] Fig.13 for Fig.12 A partial enlarged view of portion E shown;

[0066] Numbers in the figure:

[0067] 1. Desktop; 2. Upper screw rod; 3. Upper threaded sleeve; 4. Return spring; 5. Engaging outer sleeve; 6. Engaging inner sleeve; 7. Second clamping structure; 8. Casing; 9. Lower threaded sleeve; 10. Lower screw rod; 11. Base; 12. First clamping structure; 13. Gear box; 14. Bevel gear; 15. Drive shaft; 16. Drive device; 17. Through hole; 18. Positioning hole; 19. First cross bar; 20. Second cross bar; 21. Lifting mechanism; 22. Upper shell; 23. Middle shell; 24. Lower shell; 25. Upper center sleeve; 26. Lower center sleeve; 27. First slot; 28. First buckle; 29. ​​Second slot; 30. Second buckle; 31. N-type slot; 32. Backrest hook; 33. Backrest; 34. Circlip; 35. Seat DETAILED DESCRIPTION

[0068] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0069] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0070] Example 1

[0071] See also Figure 1 A schematic diagram of a liftable desk provided in this embodiment, wherein the liftable desk comprises: a desktop 1, a base 11 and a lift mechanism 21;

[0072] The lifting mechanism 21 comprises: a sleeve 8, an upper screw rod 2 and a lower screw rod 10; the sleeve 8 is through-through, the top end of the upper screw rod 2 extends from the top end of the sleeve 8 and is threadedly connected to the upper end of the sleeve 8; the lower screw rod 10 extends from the bottom end of the sleeve 8 and is threadedly connected to the lower end of the sleeve 8; the lower screw rod 10 is hollow, and the upper screw rod 2 can extend into the lower screw rod 10;

[0073] A first clamping structure 12 is provided near the top of the sleeve 8; a second clamping structure 7 which can cooperate with the first clamping structure is connected to the bottom end of the upper screw rod 2;

[0074] When the second clamping structure 7 rises to the first clamping structure 12 as the upper screw rod 2 rotates, the second clamping structure 7 cooperates with the first clamping structure 12, so that the sleeve 8 rotates together with the upper screw rod 2;

[0075] When the sleeve 8 rotates around the lower screw rod 2 and descends to the top of the lower screw rod 10 and abuts against the first clamping structure 12, the first clamping structure 12 is separated from the second clamping structure 7, so that the upper screw rod 2 rotates and descends and continues to penetrate into the lower screw rod 10.

[0076] The table top 1 is installed at the top of the upper screw rod 2; there is at least one lifting mechanism 21, and the lifting mechanisms 21 are symmetrically distributed corresponding to the table top 1; the base 11 is correspondingly installed at the lower end of the lower screw rod.

[0077] During the ascending process, the upper screw rod 2 is rotated to make it rotate and ascend around the sleeve 8 inside the lower screw rod. Since the top of the upper screw rod 2 is connected to the table top 1, the table top 1 continues to ascend with the upper screw rod; when the second clamping structure 7 rotates and ascends to the first clamping structure 12 along with the upper screw rod 2, it cooperates with the first clamping structure 12, so that the sleeve 8 rotates around the lower screw rod together with the upper screw rod 2, so that the table top 1 continues to ascend;

[0078] During the descent process, the upper screw rod 2 is rotated in the opposite direction, and the sleeve 8 rotates and descends around the lower screw rod 10, causing the table top 1 to descend accordingly; when the sleeve 8 rotates and descends around the lower screw rod until the top end of the lower screw rod 10 abuts against the first clamping structure 12, the second clamping structure 7 separates from the first clamping structure 12, causing the upper screw rod 2 to rotate and descend and continue to extend into the lower screw rod 10, thereby causing the table top 1 to continue to descend.

[0079] There is at least one lifting mechanism 21, for example, there can be one lifting mechanism 21. In order to increase the stability of the lifting desk, the upper screw rod of the lifting mechanism 21 can be fixedly installed at the bottom center of the desktop 1; there can be two lifting mechanisms 21, and the two lifting mechanisms 21 are symmetrically arranged at the bottom of the desktop 1; there can be three lifting mechanisms 21, one of the lifting mechanisms 21 is installed at the bottom center of the desktop 1, and the other two lifting mechanisms 21 are symmetrically arranged at the bottom of the desktop 1; similarly, there can be multiple desktops 1, and multiple lifting mechanisms 21 are symmetrically arranged at the bottom of the desktop 1.

[0080] By utilizing the above structure, a large lifting space is achieved, the scope of application is wider and broader, the adjustability of the same desk in different classes is met, the applicability is increased, and the waste of double inventory of educational resources for distinguishing the sizes of desks to meet the needs of different students with different heights is reduced; at the same time, the lifting and lowering of the entire lifting mechanism can be achieved only by driving the rotation of the upper screw rod 2, the adjustment process is simple, and it is more conducive to user operation.

[0081] Among them, in the preferred embodiment of the lifting mechanism 21, as Figure 5 As shown, a driving mechanism for driving the upper screw rod to rotate is installed at the upper end of the upper screw rod; the driving mechanism includes: a gear box 13, a bevel gear 14, a driving shaft 15, and a driving device 16;

[0082] The gear box 13 is installed at the bottom of the desktop 1; a through hole 17 is provided on the side wall of the gear box 13, and one end of the drive shaft 15 passes through the gear box 13 from the through hole 17, and the drive shaft 15 is driven to rotate by the drive device 16; a positioning hole 18 is provided on the bottom surface of the gear box 13, and the top end of the upper screw rod 2 is installed inside the gear box 13 through the positioning hole 18; the drive shaft 15 is connected to the top end of the upper screw rod through a group of bevel gears 14.

[0083] Its working principle is as follows: the driving device 16 drives the driving shaft 15 to rotate forward and reverse, and the driving shaft 15 is meshed with the bevel gear 14, so that the bevel gear 14 drives the upper screw rod 2 to rotate and rise; the driving device 16 changes the transmission direction of the torque, making it more convenient and quick to adjust the lifting and lowering of the lifting desk. At the same time, the set of bevel gears 15 can be matched with two fan-shaped gears, so that the transmission efficiency is high, the friction resistance is small, and the transmission process is more stable.

[0084] Among them, in the preferred embodiment of the lifting mechanism 21, as Fig. 9 As shown, the lifting mechanism 21 is also provided with a shell; the shell is installed outside the lifting mechanism 21, including: an upper shell 22, a middle shell 23, a lower shell 24, an upper center sleeve 25, and a lower center sleeve 26;

[0085] The top of the upper housing 22 is mounted on the bottom of the gear box 13; an upper center sleeve 25 is mounted on the bottom of the upper housing 22, and the upper center sleeve 25 can extend into the middle housing 23 along with the upper housing 22; the middle housing 23 can extend into the lower housing 24; a lower center sleeve 25 is mounted on the middle housing 23, and the lower center sleeve 26 can extend into the lower housing 26 along with the middle housing 23; the bottom of the lower housing 26 is mounted on the base 11;

[0086] A first slot 27 is provided near the top of the middle shell 23, at least one n-shaped slot 31 is provided on the side wall of the upper center sleeve 25, and first buckles 28 corresponding to the first slot 27 are provided on both sides of the upper center sleeve 25;

[0087] A second slot 29 is disposed near the top of the lower housing 24 , and second buckles 30 corresponding to the second slot 29 are disposed on both sides of the lower center sleeve 26 .

[0088] Ascending process: when the upper center sleeve 25 rises with the upper shell 22 to near the top of the middle shell 23, the first buckle 28 of the upper center sleeve 25 engages with the first slot 27 of the middle shell 23, and the upper shell 22 drives the middle shell 23 to continue to rise; when it rises to the highest position, the second buckle 30 on the lower center sleeve 26 engages with the second slot 30 of the lower shell 24.

[0089] Descending process: Since the upper center sleeve 25 is provided with an n-shaped groove 31, when the upper center sleeve 25 descends with the upper shell 22, due to the action of force, the buckle of the upper center sleeve 25 cooperates and separates with the first slot 27 of the middle shell 12, so that the upper shell 22 descends inside the middle shell 23; when the table top 1 descends to the position of the middle shell 23, it drives the middle shell 23 to continue to descend. At this time, the second buckle 30 and the second slot 29 of the lower shell 24 cooperate and separate due to the action of force, so that the chair surface 35 drives the middle shell 23 to continue to descend.

[0090] The side wall of the upper center sleeve 25 is provided with at least one n-type groove. For example, the side wall of the upper center sleeve 25 may be provided with one n-type groove, two n-type grooves or a plurality of n-type grooves.

[0091] The length of the upper shell 22 corresponds to the upper screw rod 2 ; the length of the middle shell 23 corresponds to the sleeve 8 ; and the length of the lower shell 24 corresponds to the lower screw rod 10 .

[0092] Among them, in a preferred embodiment of the driving device 16, the driving device 16 is a crank or a stepper motor; the crank or stepper motor is used to drive the driving shaft 15 to rotate forward and reverse; the crank includes a rocker and a crank handle, one end of the rocker is fixedly connected to the crank handle, and the other end of the rocker is provided with a driving groove, and the driving groove matches the driving shaft; when the height of the lifting desk needs to be adjusted, the driving groove of the crank handle is inserted into the driving shaft, and the lifting desk is driven to rise or fall by manually cranking the crank handle.

[0093] In a preferred embodiment of the lifting mechanism 21 , there are several lifting mechanisms 21 , and the lifting mechanisms 21 are arranged in a row; the driving shafts 15 of the arranged lifting mechanisms 21 are shared.

[0094] In order to make the lifting desk structure of the present application more stable, the lifting mechanism 21 can also be multiple; in order to make it more convenient to use and adjust, the plurality of lifting mechanisms 21 are arranged in a row and the arranged lifting mechanisms 21 share a driving shaft 15. At the same time, in order to make the structure more complete, the gear box 13 can also be provided with a through hole on the side wall on the other side where the through hole 17 is provided, so that the driving shaft 15 can pass through the through hole and enter into other gear boxes 13, so as to achieve the effect of synchronous lifting;

[0095] For example: there can be two lifting mechanisms 21, and the two lifting mechanisms 21 are arranged in an arranged manner. The upper screw rods 2 of the two lifting mechanisms 21 are symmetrically fixedly installed on the bottom of the desktop 1 respectively, and the two gear boxes are provided with through holes on the side wall on the other side where the through hole 17 is provided, so that one end of the driving shaft 15 passes through the through hole and enters the through hole 17 of the other gear box 13, and the other end of the driving shaft 14 is provided with a driving device 16; the driving shaft 15 is driven by the driving device 16 and the two lifting mechanisms 21 are controlled to realize the function of synchronous lifting.

[0096] The lifting mechanisms 21 can also be three, and the three lifting mechanisms 21 are arranged in an arranged manner, one of the lifting mechanisms 21 is fixedly installed at the bottom center of the desktop 1, and the other two lifting mechanisms 21 are symmetrically installed at the bottom of the desktop 1. The three gear boxes 13 are all provided with through holes on the side wall on the other side where the through hole 17 is provided, so that one end of the driving shaft 15 passes through the through hole and enters the other two gear boxes 13, and the other end of the driving shaft 15 is provided with a driving device 16; the driving shaft 15 is driven by the driving device 16 to simultaneously control the three lifting mechanisms 21 to realize the function of synchronous lifting.

[0097] Similarly, there can be four lifting mechanisms 21, and the four lifting mechanisms 21 are arranged in an array, and the upper screw rods 2 of the four lifting mechanisms 21 are symmetrically fixedly installed on the bottom of the desktop 1, and the four gear boxes 13 are provided with through holes on the side wall on the other side where the through hole 17 is provided, so that one end of the driving shaft 15 passes through the through hole and enters the other two gear boxes 13, and the other end of the driving shaft 15 is provided with a driving device 16; the four lifting mechanisms 21 are simultaneously controlled by the driving shaft 15 to realize the function of synchronous lifting; at the same time, it can also be divided into two groups, each group of lifting mechanisms 21 is arranged in an array, each group of lifting mechanisms 21 is symmetrically installed on the bottom of the desktop 1, and each group of lifting mechanisms 21 shares a driving shaft 15. In this way, the matrix arrangement of the lifting mechanisms 21 can be realized, making the structure more stable.

[0098] In addition, the number of the lifting mechanisms 21 can also be several pairs, and a driving device is arranged between each pair of lifting mechanisms 21, so that one driving device 16 controls two driving shafts 15 at the same time to achieve the function of synchronous lifting.

[0099] For example, the lifting mechanism 21 may be a pair and symmetrically installed at the bottom of the desktop 1 , and a driving device 16 is arranged between the two lifting mechanisms 21 , so that the driving device 16 drives the two driving shafts 15 at the same time to achieve synchronous lifting.

[0100] Similarly, the lifting mechanisms 21 can also be two pairs, and the four lifting mechanisms 21 are arranged in an array or in a matrix, and a driving device 16 is arranged between each pair of lifting mechanisms 21. Each driving device 16 drives the two driving shafts 15 at the same time to achieve synchronous lifting.

[0101] Among them, in a preferred embodiment of the lifting mechanism 21, the number of the lifting mechanisms 21 is several, and the several lifting mechanisms 21 are arranged in an array; the tops of the upper screw rods 2 of the arranged lifting mechanisms 21 are connected by a horizontally arranged first cross bar 19; the bottoms of the lower screw rods of the arranged lifting mechanisms 21 are connected by a horizontally arranged second cross bar 20.

[0102] The first cross bar 19 and the second cross bar 20 are arranged horizontally, so that the stability of the lifting mechanism 21 can be greatly increased, making the lifting desk safer and more stable during use.

[0103] Among them, in the preferred embodiment of the lifting mechanism 21, as Fig.13 As shown, the first clamping structure includes: an engaging inner sleeve 6, an engaging outer sleeve 5, a return spring 4, and a clamping spring 34;

[0104] The meshing outer sleeve 5 is fixed inside the sleeve 8; a retaining spring 34 is installed near the bottom of the meshing outer sleeve 5; the meshing inner sleeve 6 is sleeved inside the meshing outer sleeve 5; the meshing inner sleeve 6 has an upper structure and a lower structure, the upper part of the meshing inner sleeve 6 is meshed and connected with the meshing outer sleeve 5, and the lower part of the meshing inner sleeve 6 can pass through the retaining spring 34, so that the retaining spring 34 abuts against the upper part of the meshing inner sleeve 6;

[0105] A slot is provided near the bottom of the engagement sleeve 5 so that the retaining spring 34 can be installed in the slot. The engagement sleeve 5 can be installed inside the sleeve 8 by casting, welding or the like.

[0106] The meshing inner sleeve 6 has a polygonal inner wall; the second clamping structure 7 has a corresponding polygonal outer wall, for example, the second clamping structure 7 can be a hexagonal nut, and the meshing inner sleeve 6 has a hexagonal inner wall matching the second clamping structure 7; the second clamping structure 7 can also be a triangular nut, a square nut or other special-shaped structure, and the meshing inner sleeve 6 has a polygonal inner wall matching the second clamping structure 7; the length of the second clamping structure 7 is less than the length of the lower part of the meshing inner sleeve 6;

[0107] The return spring 4 is sleeved outside the upper screw rod 2 and is located between the meshing inner sleeve 6 and the upper end of the sleeve 8. The diameter of the return spring 4 is larger than the outer diameter of the meshing inner sleeve 6.

[0108] The outer diameter of the lower screw rod 10 is larger than the inner diameter of the lower part of the engaging inner sleeve 6, and the inner diameter of the lower screw rod 10 is smaller than the outer diameter of the lower part of the engaging outer sleeve 6; when the top end of the lower screw rod 10 abuts against the bottom of the engaging inner sleeve 6, it can drive the engaging inner sleeve 6 to compress the return spring and rise, thereby separating the engaging inner sleeve 6 from the second clamping structure 7.

[0109] During the ascending process, the upper screw rod 2 is rotated to make it rotate and ascend around the sleeve 8 inside the lower screw rod. When the second clamping structure 7 rotates and ascends to the meshing inner sleeve 6 along with the upper screw rod 2, the upper part of the meshing inner sleeve 6 is engaged with the second clamping structure 7. At the same time, since the upper part of the meshing inner sleeve 6 is engaged with the meshing outer sleeve 5, the upper screw rod 2 is continued to be rotated, so that the sleeve 8 rotates and ascends around the lower screw rod along with the upper screw rod 2.

[0110] During the descending process, the sleeve 8 rotates around the lower screw rod 10 and descends until the top end of the lower screw rod abuts against the lower part of the engaging inner sleeve 6. The top end of the lower screw rod 10 drives the engaging inner sleeve 6 to rise and compresses the return spring 4 at the same time. Since the length of the second clamping structure 7 is smaller than the length of the lower part of the engaging inner sleeve 6, when the top end of the lower screw rod 10 drives the engaging inner sleeve 6 to rise to the bottom end of the engaging outer sleeve, the second clamping structure 7 is separated from the engaging inner sleeve 6, so that the upper screw rod 2 can continue to rotate and descend and extend into the lower screw rod 10.

[0111] At the same time, the first clamping structure 12 is not removable, and the use of all-steel parts with a wall thickness of 1mm-1.7mm increases the wear resistance and service life of the product. The second clamping structure 7 and the meshing inner sleeve 6 are constantly mechanically matched and separated, and the consistency of their movement trajectory is improved through packaging.

[0112] Among them, in a preferred embodiment of the lifting mechanism 21, an upper threaded sleeve 3 is installed in the upper port of the sleeve 8, and the upper screw rod 2 is threadedly connected to the upper threaded sleeve 3; a lower threaded sleeve 8 is installed in the lower port of the sleeve 8; and the lower threaded sleeve 9 is threadedly connected to the lower screw rod 10.

[0113] The upper thread sleeve 3 can be fixed to the upper end of the sleeve 8 by welding; the structure is made more complete by sleeve-fixing the upper thread sleeve 3 in the upper end of the sleeve 8, which reduces the processing difficulty of the sleeve 8; the upper thread sleeve 3 is provided with an internal thread and is threadedly connected with the upper screw rod 2, and the upper screw rod 2 can be rotated and lifted inside the sleeve 8 by the upper thread sleeve 3.

[0114] The lower thread sleeve 9 can be fixed to the lower end of the sleeve 9 by welding; the lower thread sleeve 9 is fixed by sleeve-fitting it into the lower end of the sleeve 8 to make the structure more complete and reduce the processing difficulty of the sleeve 8; the lower thread sleeve 9 is provided with an internal thread and is threadedly connected with the lower screw rod 10, so that the sleeve 8 can be rotated and lifted around the lower screw rod 10.

[0115] Among them, in the preferred embodiment of the desktop 1, a desk drawer 31 is installed under the desktop 1; school bag hooks 32 can also be installed on both sides of the gear box; so that the storage space is increased while improving the space utilization rate.

[0116] Example 2

[0117] See also Figure 2 A schematic diagram of a liftable classroom chair provided in this embodiment, wherein the liftable classroom chair comprises: a seat 35, a base 11 and a lift mechanism 21;

[0118] The lifting mechanism 21 comprises: a sleeve 8, an upper screw rod 2 and a lower screw rod 10; the sleeve 8 is through-through, the top end of the upper screw rod 2 extends from the top end of the sleeve 8 and is threadedly connected to the upper end of the sleeve 8; the lower screw rod 10 extends from the bottom end of the sleeve 8 and is threadedly connected to the lower end of the sleeve 8; the lower screw rod 10 is hollow, and the upper screw rod 2 can extend into the lower screw rod 10;

[0119] A first clamping structure 12 is provided near the top of the sleeve 8; a second clamping structure 7 which can cooperate with the first clamping structure is connected to the bottom end of the upper screw rod 2;

[0120] When the second clamping structure 7 rises to the first clamping structure 12 as the upper screw rod 2 rotates, the second clamping structure 7 cooperates with the first clamping structure 12, so that the sleeve 8 rotates together with the upper screw rod 2;

[0121] When the sleeve 8 rotates around the lower screw rod 2 and descends to the top of the lower screw rod 10 and abuts against the first clamping structure 12, the first clamping structure 12 is separated from the second clamping structure 7, so that the upper screw rod 2 rotates and descends and continues to penetrate into the lower screw rod 10.

[0122] The seat surface 35 is installed at the top end of the upper screw rod 2 ; there is at least one lifting mechanism 21 , and the lifting mechanisms 21 are symmetrically distributed corresponding to the seat surface 35 ; the base 11 is correspondingly installed at the lower end of the lower screw rod 10 .

[0123] During the rising process, the upper screw rod 2 is rotated to make it rotate and rise around the sleeve 8 inside the lower screw rod. Since the top of the upper screw rod 2 is connected to the seat seat 35, the seat seat 35 continues to rise with the upper screw rod 2; when the second clamping structure 7 rotates and rises to the first clamping structure 12 along with the upper screw rod 2, it cooperates with the first clamping structure 12, so that the sleeve 8 rotates around the lower screw rod together with the upper screw rod 2, so that the seat seat 35 rotates and descends around the lower screw rod 10, and the seat seat 35 descends accordingly; when the sleeve 8 rotates and descends around the lower screw rod until the top end of the lower screw rod 10 abuts against the first clamping structure 12, the second clamping structure 7 separates from the first clamping structure 12, so that the upper screw rod 2 rotates and descends and continues to extend into the lower screw rod 10, thereby causing the seat seat 35 to continue to descend.

[0124] There is at least one lifting mechanism 21, for example, there can be one lifting mechanism 21. In order to increase the stability of the lifting table, the upper screw rod of the lifting mechanism 21 can be fixedly installed at the bottom center of the chair surface 35; there can be two lifting mechanisms 21, and the two lifting mechanisms 21 are symmetrically arranged at the bottom of the chair surface 35; there can be three lifting mechanisms 21, one of the lifting mechanisms 21 is installed at the bottom center of the chair surface 35, and the other two lifting mechanisms 21 are symmetrically arranged at the bottom of the chair surface 35; similarly, there can be multiple chair surfaces 35, and multiple lifting mechanisms 21 are symmetrically arranged at the bottom of the chair surface 35.

[0125] By utilizing the above structure, a large lifting space is achieved, the scope of application is wider and broader, the adjustability of chairs in different classes is met, the applicability is increased, and the waste of double inventory of educational resources for distinguishing the sizes of chairs to meet the needs of different students with different heights is reduced; at the same time, the lifting and lowering of the entire lifting mechanism can be achieved only by driving the rotation of the upper screw rod, the adjustment process is simple, and it is more conducive to user operation.

[0126] Among them, in the preferred embodiment of the lifting mechanism 21, as Figure 5 As shown, a driving mechanism for driving the upper screw rod to rotate is installed at the upper end of the upper screw rod; the driving mechanism includes: a gear box 13, a bevel gear 14, a driving shaft 15, and a driving device 16;

[0127] The gear box 13 is installed at the bottom of the seat surface 35; the side wall of the gear box 13 is provided with a through hole 17, one end of the drive shaft 15 passes through the gear box 13 from the through hole 17, and the drive shaft 15 is driven to rotate by the drive device 16; the bottom surface of the gear box 13 is provided with a positioning hole 18, and the top end of the upper screw rod 2 is installed inside the gear box 13 through the positioning hole 18; the drive shaft 15 is connected to the top end of the upper screw rod through a group of bevel gears 14.

[0128] Its working principle is as follows: the driving device 16 drives the driving shaft 15 to rotate forward and reverse, and the driving shaft 15 is meshed with the helical gear 14, so that the helical gear 14 drives the upper screw rod 2 to rotate and rise; the driving device 16 changes the transmission direction of the torque, making it more convenient and quick to adjust the lifting table. At the same time, the set of helical gears 15 can be matched with two fan-shaped gears, so that the transmission efficiency is high, the friction resistance is small, and the transmission process is more stable.

[0129] Among them, in the preferred embodiment of the lifting mechanism 21, as Figure 8 As shown, the lifting mechanism 21 is also provided with a shell; the shell is installed outside the lifting mechanism 21, including: an upper shell 22, a middle shell 23, a lower shell 24, an upper center sleeve 25, and a lower center sleeve 26;

[0130] The top of the upper housing 22 is mounted on the bottom of the gear box 13; an upper center sleeve 25 is mounted on the bottom of the upper housing 22, and the upper center sleeve 25 can extend into the middle housing 23 along with the upper housing 22; the middle housing 23 can extend into the lower housing 24; a lower center sleeve 25 is mounted on the middle housing 23, and the lower center sleeve 26 can extend into the lower housing 26 along with the middle housing 23; the bottom of the lower housing 26 is mounted on the base 11;

[0131] A first slot 27 is provided near the top of the middle shell 23, at least one n-shaped slot 31 is provided on the side wall of the upper center sleeve 25, and first buckles 28 corresponding to the first slot 27 are provided on both sides of the upper center sleeve 25;

[0132] A second slot 29 is disposed near the top of the lower housing 24 , and second buckles 30 corresponding to the second slot 29 are disposed on both sides of the lower center sleeve 26 .

[0133] Ascending process: when the upper center sleeve 25 rises with the upper shell 22 to near the top of the middle shell 23, the first buckle 28 of the upper center sleeve 25 engages with the first slot 27 of the middle shell 23, and the upper shell 22 drives the middle shell 23 to continue to rise; when it rises to the highest position, the second buckle 30 on the lower center sleeve 26 engages with the second slot 30 of the lower shell 24.

[0134] Descending process: Since the upper center sleeve 25 is provided with an n-type groove 31, when the upper center sleeve 25 descends with the upper shell 22, due to the action of force, the buckle of the upper center sleeve 25 cooperates and separates with the first slot 27 of the middle shell 12, so that the upper shell 22 descends inside the middle shell 23; when the seat surface 35 descends to the position of the middle shell 23, it drives the middle shell 23 to continue to descend. At this time, the second buckle 30 and the second slot 29 of the lower shell 24 cooperate and separate due to the action of force, so that the seat surface 35 drives the middle shell 23 to continue to descend.

[0135] The side wall of the upper center sleeve 25 is provided with at least one n-type groove. For example, the side wall of the upper center sleeve 25 may be provided with one n-type groove, two n-type grooves or a plurality of n-type grooves.

[0136] The length of the upper shell 22 corresponds to the upper screw rod 2 ; the length of the middle shell 23 corresponds to the sleeve 8 ; and the length of the lower shell 24 corresponds to the lower screw rod 10 .

[0137] Among them, in a preferred embodiment of the driving device 16, the driving device 16 is a crank or a stepper motor; the crank or stepper motor is used to drive the driving shaft 15 to rotate forward and reverse; the crank includes a rocker and a crank handle, one end of the rocker is fixedly connected to the crank handle, and the other end of the rocker is provided with a driving groove, and the driving groove matches the driving shaft; when the height of the lifting table needs to be adjusted, the driving groove of the crank handle is inserted into the driving shaft, and the lifting table is driven to rise or fall by manually cranking the crank handle.

[0138] In a preferred embodiment of the lifting mechanism 21 , there are several lifting mechanisms 21 , and the lifting mechanisms 21 are arranged in a row; the driving shafts 15 of the arranged lifting mechanisms 21 are shared.

[0139] In order to make the lifting table structure of the present application more stable, the lifting mechanism 21 can also be multiple; in order to facilitate the use and adjustment, the plurality of lifting mechanisms 21 are arranged in parallel and the arranged lifting mechanisms 21 share a driving shaft 15. At the same time, in order to make the structure more complete, the gear box 13 can also be provided with a through hole on the side wall on the other side where the through hole 17 is provided, so that the driving shaft 15 can pass through the through hole and enter into other gear boxes 13, so as to achieve the effect of synchronous lifting;

[0140] For example: there can be two lifting mechanisms 21, and the two lifting mechanisms 21 are arranged in an arranged manner. The upper screw rods 2 of the two lifting mechanisms 21 are symmetrically fixedly installed on the bottom of the seat surface 1 respectively, and the two gear boxes are provided with through holes on the side wall on the other side where the through hole 17 is provided, so that one end of the driving shaft 15 passes through the through hole and enters the through hole 17 of the other gear box 13, and the other end of the driving shaft 14 is provided with a driving device 16; the driving shaft 15 is driven by the driving device 16 and the two lifting mechanisms 21 are controlled to realize the function of synchronous lifting.

[0141] The lifting mechanisms 21 can also be three, and the three lifting mechanisms 21 are arranged in an arranged manner, one of the lifting mechanisms 21 is fixedly installed at the bottom center of the seat surface 35, and the other two lifting mechanisms 21 are symmetrically installed at the bottom of the seat surface 35. The three gear boxes 13 are all provided with through holes on the side wall on the other side where the through hole 17 is provided, so that one end of the drive shaft 15 passes through the through hole and enters the other two gear boxes 13, and the other end of the drive shaft 15 is provided with a driving device 16; the driving shaft 15 is driven by the driving device 16 to simultaneously control the three lifting mechanisms 21 to realize the function of synchronous lifting.

[0142] Similarly, there can be four lifting mechanisms 21, and the four lifting mechanisms 21 are arranged in an array. The upper screw rods 2 of the four lifting mechanisms 21 are symmetrically fixed on the bottom of the seat surface 35, and the four gear boxes 13 are provided with through holes on the side wall on the other side where the through hole 17 is provided, so that one end of the drive shaft 15 passes through the through hole and enters the other two gear boxes 13, and the other end of the drive shaft 15 is provided with a driving device 16; the four lifting mechanisms 21 are simultaneously controlled by the drive shaft 15 to realize the function of synchronous lifting; at the same time, they can also be divided into two groups, each group of lifting mechanisms 21 is arranged in an array, each group of lifting mechanisms 21 is symmetrically installed on the bottom of the seat surface 35, and each group of lifting mechanisms 21 shares a driving shaft 15. In this way, the matrix arrangement of the lifting mechanisms 21 can be realized, making the structure more stable.

[0143] In addition, the number of the lifting mechanisms 21 can also be several pairs, and a driving device is arranged between each pair of lifting mechanisms 21, so that one driving device 16 controls two driving shafts 15 at the same time to achieve the function of synchronous lifting.

[0144] For example, the lifting mechanism 21 may be a pair and symmetrically installed at the bottom of the seat surface 35 , and a driving device 16 is arranged between the two lifting mechanisms 21 , so that the driving device 16 drives the two driving shafts 15 at the same time to achieve synchronous lifting.

[0145] Similarly, the lifting mechanisms 21 can also be two pairs, and the four lifting mechanisms 21 are arranged in an array or in a matrix, and a driving device 16 is arranged between each pair of lifting mechanisms 21. Each driving device 16 drives the two driving shafts 15 at the same time to achieve synchronous lifting.

[0146] Among them, in a preferred embodiment of the lifting mechanism 21, the number of the lifting mechanisms 21 is several, and the several lifting mechanisms 21 are arranged in an array; the tops of the upper screw rods 2 of the arranged lifting mechanisms 21 are connected by a horizontally arranged first cross bar 19; the bottoms of the lower screw rods of the arranged lifting mechanisms 21 are connected by a horizontally arranged second cross bar 20.

[0147] The horizontally arranged first cross bar 19 and second cross bar 20 can greatly increase the stability of the lifting mechanism 21, making the lifting table safer and more stable during use.

[0148] Among them, in the preferred embodiment of the lifting mechanism 21, as Fig.13 As shown, the first clamping structure includes: an engaging inner sleeve 6, an engaging outer sleeve 5, a return spring 4, and a clamping spring 34;

[0149] The meshing outer sleeve 5 is fixed inside the sleeve 8; a retaining spring 34 is installed near the bottom of the meshing outer sleeve 5; the meshing inner sleeve 6 is sleeved inside the meshing outer sleeve 5; the meshing inner sleeve 6 has an upper structure and a lower structure, the upper part of the meshing inner sleeve 6 is meshed and connected with the meshing outer sleeve 5, and the lower part of the meshing inner sleeve 6 can pass through the retaining spring 34, so that the retaining spring 34 abuts against the upper part of the meshing inner sleeve 6;

[0150] A slot is provided near the bottom of the engagement sleeve 5 so that the retaining spring 34 can be installed in the slot. The engagement sleeve 5 can be installed inside the sleeve 8 by casting, welding or the like.

[0151] The meshing inner sleeve 6 has a polygonal inner wall; the second clamping structure 7 has a corresponding polygonal outer wall, for example, the second clamping structure 7 can be a hexagonal nut, and the meshing inner sleeve 6 has a hexagonal inner wall matching the second clamping structure 7; the second clamping structure 7 can also be a triangular nut, a square nut or other special-shaped structure, and the meshing inner sleeve 6 has a polygonal inner wall matching the second clamping structure 7; the length of the second clamping structure 7 is less than the length of the lower part of the meshing inner sleeve 6;

[0152] The return spring 4 is sleeved outside the upper screw rod 2 and is located between the meshing inner sleeve 6 and the upper end of the sleeve 8. The diameter of the return spring 4 is larger than the outer diameter of the meshing inner sleeve 6.

[0153] The outer diameter of the lower screw rod 10 is larger than the inner diameter of the lower part of the engaging inner sleeve 6, and the inner diameter of the lower screw rod 10 is smaller than the outer diameter of the lower part of the engaging outer sleeve 6; when the top end of the lower screw rod 10 abuts against the bottom of the engaging inner sleeve 6, it can drive the engaging inner sleeve 6 to compress the return spring and rise, thereby separating the engaging inner sleeve 6 from the second clamping structure 7.

[0154] During the ascending process, the upper screw rod 2 is rotated to make it rotate and ascend around the sleeve 8 inside the lower screw rod. When the second clamping structure 7 rotates and ascends to the meshing inner sleeve 6 along with the upper screw rod 2, the upper part of the meshing inner sleeve 6 is engaged with the second clamping structure 7. At the same time, since the upper part of the meshing inner sleeve 6 is engaged with the meshing outer sleeve 5, the upper screw rod 2 is continued to be rotated, so that the sleeve 8 rotates and ascends around the lower screw rod along with the upper screw rod 2.

[0155] During the descending process, the sleeve 8 rotates around the lower screw rod 10 and descends until the top end of the lower screw rod abuts against the lower part of the engaging inner sleeve 6. The top end of the lower screw rod 10 drives the engaging inner sleeve 6 to rise and compresses the return spring 4 at the same time. Since the length of the second clamping structure 7 is smaller than the length of the lower part of the engaging inner sleeve 6, when the top end of the lower screw rod 10 drives the engaging inner sleeve 6 to rise to the bottom end of the engaging outer sleeve, the second clamping structure 7 is separated from the engaging inner sleeve 6, so that the upper screw rod can continue to rotate and descend and extend into the lower screw rod.

[0156] At the same time, the first clamping structure 12 is not removable, and the use of all-steel parts with a wall thickness of 1mm-1.7mm increases the wear resistance and service life of the product. The second clamping structure 7 and the meshing inner sleeve 6 are constantly mechanically matched and separated, and the consistency of their movement trajectory is improved through packaging.

[0157] Among them, in a preferred embodiment of the lifting mechanism 21, an upper threaded sleeve 3 is installed in the upper port of the sleeve 8, and the upper screw rod 2 is threadedly connected to the upper threaded sleeve 3; a lower threaded sleeve 8 is installed in the lower port of the sleeve 8; and the lower threaded sleeve 9 is threadedly connected to the lower screw rod 10.

[0158] The upper thread sleeve 3 can be fixed to the upper end of the sleeve 8 by welding; the structure is made more complete by sleeve-fixing the upper thread sleeve 3 in the upper end of the sleeve 8, which reduces the processing difficulty of the sleeve 8; the upper thread sleeve 3 is provided with an internal thread and is threadedly connected with the upper screw rod 2, and the upper screw rod 2 can be rotated and lifted inside the sleeve 8 by the upper thread sleeve 3.

[0159] The lower thread sleeve 9 can be fixed to the lower end of the sleeve 9 by welding; the lower thread sleeve 9 is fixed by sleeve-fitting it into the lower end of the sleeve 8 to make the structure more complete and reduce the processing difficulty of the sleeve 8; the lower thread sleeve 9 is provided with an internal thread and is threadedly connected with the lower screw rod 10, so that the sleeve 8 can be rotated and lifted around the lower screw rod 10.

[0160] Among them, in the preferred embodiment of the seat surface 35, a backrest 33 is installed on one side of the seat surface 35. In order to meet more needs, installing the backrest 33 on one side of the seat surface 35 can increase the comfort during use.

[0161] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A lifting desk, characterized in that: include: A desktop (1), a base (11) and a lifting mechanism (21); The lifting mechanism (21) comprises: a sleeve (8), an upper screw rod (2) and a lower screw rod (10); the sleeve (8) is connected from top to bottom, the top end of the upper screw rod (2) extends from the top end of the sleeve (8) and is threadedly connected to the upper end of the sleeve (8); the lower screw rod (10) extends from the bottom end of the sleeve (8) and is threadedly connected to the lower end of the sleeve (8); the lower screw rod (10) is hollow, and the upper screw rod (2) can extend into the lower screw rod (10); A first clamping structure (12) is provided near the top of the sleeve (8); the bottom end of the upper screw rod (2) is connected to a second clamping structure (7) that can cooperate with the first clamping structure; when the upper screw rod (2) rotates and rises to the first clamping structure (12), the second clamping structure (7) cooperates with the first clamping structure (12), so that the sleeve (8) rotates together with the upper screw rod (2); when the sleeve (8) rotates and descends around the lower screw rod (10) to the top of the lower screw rod (10) and abuts against the first clamping structure (12), the first clamping structure (12) and the second clamping structure (7) are separated, so that the upper screw rod (2) rotates and descends and continues to penetrate into the lower screw rod (10); The tabletop (1) is mounted on the top of the upper screw rod (2); there is at least one lifting mechanism (21), and the lifting mechanisms (21) are symmetrically distributed corresponding to the tabletop (1); the base (11) is correspondingly mounted on the lower end of the lower screw rod (10); The upper end of the upper screw rod is provided with a driving mechanism for driving the upper screw rod to rotate; the driving mechanism comprises: a gear box (13), a bevel gear (14), a driving shaft (15), and a driving device (16); the gear box (13) is installed at the bottom of the table top (1); a through hole (17) is provided on the side wall of the gear box (13), one end of the driving shaft (15) penetrates into the gear box (13) through the through hole (17), and the driving shaft (15) is driven to rotate by the driving device (16); a positioning hole (18) is provided on the bottom surface of the gear box (13), and the top end of the upper screw rod (2) is installed inside the gear box (13) through the positioning hole (18); the driving shaft (15) is connected to the top end of the upper screw rod through a group of bevel gears (14); The first clamping structure comprises: an engaging inner sleeve (6), an engaging outer sleeve (5), a return spring (4), and a retaining spring (34); the engaging outer sleeve (5) is fixed inside the sleeve (8); a retaining spring (34) is installed near the bottom of the engaging outer sleeve (5); the engaging inner sleeve (6) is sleeved inside the engaging outer sleeve (5); the engaging inner sleeve (6) has an upper structure and a lower structure, the upper part of the engaging inner sleeve (6) is engaged with the engaging outer sleeve (5), and the lower part of the engaging inner sleeve (6) can pass through the retaining spring (34), so that the retaining spring (34) abuts against the upper part of the engaging inner sleeve (6); The meshing inner sleeve (6) has a polygonal inner wall; the second clamping structure (7) has a corresponding polygonal outer wall, and the length of the second clamping structure (7) is less than the length of the lower part of the meshing inner sleeve (6); The return spring (4) is sleeved outside the upper screw rod (2) and is located between the meshing inner sleeve (6) and the upper end of the sleeve (8); the diameter of the return spring (4) is larger than the outer diameter of the meshing inner sleeve (6); The outer diameter of the lower screw rod (10) is greater than the inner diameter of the lower portion of the meshing inner sleeve (6), and the inner diameter of the lower screw rod (10) is smaller than the outer diameter of the lower portion of the meshing outer sleeve (5).

2. The lifting desk according to claim 1, characterized in that: The lifting mechanism (21) is also provided with a shell; the shell is installed outside the lifting mechanism (21), and comprises: an upper shell (22), a middle shell (23), a lower shell (24), an upper center sleeve (25), and a lower center sleeve (26); The top of the upper shell (22) is mounted on the bottom of the gear box (13); an upper center sleeve (25) is mounted on the bottom of the upper shell (22), and the upper center sleeve (25) can be extended into the interior of the middle shell (23) along with the upper shell (22); the middle shell (23) can be extended into the interior of the lower shell (24); a lower center sleeve (26) is mounted on the middle shell (23), and the lower center sleeve (26) can be extended into the interior of the lower shell (24) along with the middle shell (23); the bottom of the lower shell (24) is mounted on the base (11); a first card slot (27) is provided near the top of the middle shell (23), the side wall of the upper center sleeve (25) is provided with at least one n-shaped groove (31), and first buckles (28) corresponding to the first card slot (27) are provided on both sides of the upper center sleeve (25); A second card slot (29) is provided in the lower shell (24) near the top, and second buckles (30) corresponding to the second card slot (29) are provided on both sides of the lower center sleeve (26).

3. The lifting desk according to claim 1, characterized in that: The driving device (16) is a crank or a stepping motor.

4. The lifting desk according to claim 1, characterized in that: The number of the lifting mechanisms (21) is several, and the lifting mechanisms (21) are arranged in a row; the driving shafts (15) of the lifting mechanisms (21) arranged in a row are shared.

5. The lifting desk according to claim 1, characterized in that: The number of the lifting mechanisms (21) is several, and the several lifting mechanisms (21) are arranged in a row; the tops of the upper screw rods (2) of the arranged lifting mechanisms (21) are connected by a horizontally arranged first cross bar (19); the bottoms of the lower screw rods of the arranged lifting mechanisms (21) are connected by a horizontally arranged second cross bar (20).

6. The lifting desk according to claim 1, characterized in that: An upper threaded sleeve (3) is sleeved and installed in the upper end of the sleeve (8), and the upper screw rod (2) is threadedly connected to the upper threaded sleeve (3); a lower threaded sleeve (9) is sleeved and installed in the lower end of the sleeve (8); and the lower threaded sleeve (9) is threadedly connected to the lower screw rod (10).

7. The liftable desk according to claim 1, characterized in that: A table top is installed below the table top (1); and school bag hooks (32) are installed on both sides of the gear box.

8. A lifting chair, characterized in that: include: A seat surface (35), a base (11) and a lifting mechanism (21); the lifting mechanism (21) comprises: a sleeve (8), an upper screw rod (2) and a lower screw rod (10); The sleeve (8) is connected from top to bottom, the top end of the upper screw rod (2) extends from the top end of the sleeve (8) and is threadedly connected to the upper end of the sleeve (8); the lower screw rod (10) extends from the bottom end of the sleeve (8) and is threadedly connected to the lower end of the sleeve (8); the lower screw rod (10) is hollow, and the upper screw rod (2) can extend into the lower screw rod (10); A first clamping structure (12) is provided near the top of the sleeve (8); a second clamping structure (7) that can cooperate with the first clamping structure is connected to the bottom end of the upper screw rod (2); when the second clamping structure (7) rotates and rises to the first clamping structure (12) as the upper screw rod (2) rises, it cooperates with the first clamping structure (12), so that the sleeve (8) rotates together with the upper screw rod (2); When the sleeve (8) rotates and descends around the lower screw rod (10) until the top of the lower screw rod (10) abuts against the first clamping structure (12), the first clamping structure (12) separates from the second clamping structure (7), so that the upper screw rod (2) rotates and descends and continues to penetrate into the lower screw rod (10); The seat surface (35) is mounted on the top of the upper screw rod (2); there is at least one lifting mechanism (21), and the lifting mechanisms (21) are symmetrically distributed corresponding to the seat surface (35); the base (11) is correspondingly mounted on the lower end of the lower screw rod (10); The upper end of the upper screw rod (2) is provided with a driving mechanism for driving the upper screw rod (2) to rotate; the driving mechanism comprises: a gear box (13), a bevel gear (14), a driving shaft (15), and a driving device (16); The gear box (13) is installed at the bottom of the seat surface (35); a through hole (17) is provided on the side wall of the gear box (13), one end of the drive shaft (15) penetrates into the gear box (13) from the through hole (17), and the drive shaft (15) is driven to rotate by the drive device (16); a positioning hole (18) is provided on the bottom surface of the gear box (13), and the top end of the upper screw rod (2) is installed inside the gear box (13) through the positioning hole (18); the drive shaft (15) is connected to the top end of the upper screw rod through a group of bevel gears (14); The first clamping structure comprises: an engaging inner sleeve (6), an engaging outer sleeve (5), a return spring (4), and a clamping spring (34); The meshing outer sleeve (5) is fixed inside the sleeve (8); a retaining spring (34) is installed near the bottom of the meshing outer sleeve (5); the meshing inner sleeve (6) is sleeved inside the meshing outer sleeve (5); the meshing inner sleeve (6) has an upper structure and a lower structure, the upper part of the meshing inner sleeve (6) is meshed and connected with the meshing outer sleeve (5), and the lower part of the meshing inner sleeve (6) can pass through the retaining spring (34), so that the retaining spring (34) abuts against the upper part of the meshing inner sleeve (6); The meshing inner sleeve (6) has a polygonal inner wall; the second clamping structure (7) has a corresponding polygonal outer wall, and the length of the second clamping structure (7) is less than the length of the lower part of the meshing inner sleeve (6); The return spring (4) is sleeved outside the upper screw rod (2) and is located between the meshing inner sleeve (6) and the upper end of the sleeve (8); the diameter of the return spring (4) is larger than the outer diameter of the meshing inner sleeve (6); The outer diameter of the lower screw rod (10) is greater than the inner diameter of the lower portion of the meshing inner sleeve (6), and the inner diameter of the lower screw rod (10) is smaller than the outer diameter of the lower portion of the meshing outer sleeve (5).

9. The lifting chair according to claim 8, characterized in that: The lifting mechanism (21) is also provided with a shell; the shell is installed outside the lifting mechanism (21), and comprises: an upper shell (22), a middle shell (23), a lower shell (24), an upper center sleeve (25), and a lower center sleeve (26); The top of the upper shell (22) is mounted on the bottom of the gear box (13); an upper center sleeve (25) is mounted on the bottom of the upper shell (22), and the upper center sleeve (25) can be extended into the interior of the middle shell (23) along with the upper shell (22); the middle shell (23) can be extended into the interior of the lower shell (24); a lower center sleeve (26) is mounted on the middle shell (23), and the lower center sleeve (26) can be extended into the interior of the lower shell (24) along with the middle shell (23); the bottom of the lower shell (24) is mounted on the base (11); a first card slot (27) is provided near the top of the middle shell (23), the side wall of the upper center sleeve (25) is provided with at least one n-shaped groove (31), and first buckles (28) corresponding to the first card slot (27) are provided on both sides of the upper center sleeve (25); A second card slot (29) is provided in the lower shell (24) near the top, and second buckles (30) corresponding to the second card slot (29) are provided on both sides of the lower center sleeve (26).

10. The lifting chair according to claim 8, characterized in that: The driving device (16) is a crank or a stepping motor.

11. The lifting chair according to claim 8, characterized in that: The number of the lifting mechanisms (21) is several, and the lifting mechanisms (21) are arranged in a row; the driving shafts (15) of the lifting mechanisms (21) arranged in a row are shared.

12. The lifting chair according to claim 8, characterized in that: The number of the lifting mechanisms (21) is several, and the several lifting mechanisms (21) are arranged in a row; the tops of the upper screw rods of the arranged lifting mechanisms (21) are connected by a horizontally arranged first cross bar (19); the bottoms of the lower screw rods of the arranged lifting mechanisms (21) are connected by a horizontally arranged second cross bar (20).

13. The lifting chair according to claim 8, characterized in that: An upper threaded sleeve (3) is sleeved and installed in the upper end of the sleeve (8), and the upper screw rod (2) is threadedly connected to the upper threaded sleeve (3); a lower threaded sleeve (9) is sleeved and installed in the lower end of the sleeve (8); and the lower threaded sleeve (9) is threadedly connected to the lower screw rod (10).

14. The lifting chair according to claim 8, characterized in that: A backrest (33) is installed on one side of the chair surface (35).

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