Lifting mechanism for table or chair

Abstract

The utility model provides a lifting mechanism for a table or a chair, and belongs to the technical field of tables and chairs. The lifting mechanism solves the problem that an existing lifting mechanism used on a table or a chair is small in lifting stroke. The lifting mechanism for the table or the chair comprises a bottom pipe, a sliding pipe inserted into the bottom pipe and a top pipe inserted into the sliding pipe, the lower end of the bottom pipe is connected with table bottom feet of the table or chair bottom feet of the chair, and the upper end of the top pipe is connected with a table plate of the table or a chair body of the chair. An adjusting assembly capable of positioning or unlocking and positioning the lower end of the top pipe and the sliding pipe is arranged in the top pipe, a mounting base is connected to the outer side wall of the upper end of the bottom pipe, a first elastic piece with one end always having the trend of moving towards the interior of the bottom pipe in the transverse direction is arranged in the mounting base, and a receding hole allowing the first elastic piece to penetrate is formed in the upper end of the bottom pipe. The lower end of the sliding pipe is provided with a positioning hole for the first elastic piece to penetrate through. The lifting mechanism can lift the lifting stroke of the table plate and the seat plate in the table and chair in actual use.

Description

Technical Field

[0001] This utility model belongs to the field of table and chair technology, and relates to a lifting mechanism for tables or chairs. Background Technology

[0002] There are increasingly more desks and chairs for lunch breaks. One type lowers the tabletop to a lower position, flips the front of the tabletop downwards, and then tilts the chair back backwards, allowing students' legs to rest on the tabletop. Lowering the tabletop also makes room for the chair back to be folded down. Another type raises the tabletop and then tilts the chair back backwards. Because raising the tabletop makes room for the chair back to be folded down, lunch breaks are more convenient.

[0003] Both of the above methods require the table legs to have a large lifting range, but the existing table legs have limited lifting range. The existing ones usually use a double telescopic leg structure, but the lifting range of the double telescopic leg structure is limited, which means that after lifting, it cannot be lowered to a lower position or raised to a higher position.

[0004] Therefore, in response to the problem of lifting stroke, other lifting devices have been developed, such as the Chinese patent application [Authorization Announcement No.: CN204970355U] which discloses a folding chair leg telescopic mechanism, including three sleeved and movable rods. The innermost rod of the three rods is provided with a spring pin, and the middle rod and the outer rod are respectively provided with positioning points and slots. The spring pin passes through the positioning points to lock the inner rod and the middle rod. The outer end of the spring pin is exposed in the slot. The outer rod can move up and down at least the distance set in the slot.

[0005] Although the above structure uses three interlocking and movable rods, the innermost rod's spring pin is always locked at the positioning point. The outer rod can move up and down within the space of the slot, but the outer tube only provides sliding space and is mainly used to fold the chair legs, making it convenient to fold and unfold the chair legs. The outer tube does not adjust the height of the entire chair leg, so it cannot increase the lifting stroke. As a result, the lifting stroke of the support leg is small and cannot provide enough space for students to rest comfortably at noon. Utility Model Content

[0006] The purpose of this utility model is to address the aforementioned problems in existing technologies by proposing a lifting mechanism for tables or chairs. The technical problem to be solved by this utility model is: how to solve the problem of the small lifting stroke of existing lifting mechanisms for tables or chairs.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A lifting mechanism for a table or chair includes a base tube, a sliding tube inserted into the base tube, and a top tube inserted into the sliding tube. The lower end of the base tube is connected to the table legs of the table or the chair legs of the chair, and the upper end of the top tube is connected to the tabletop of the table or the chair body of the chair. The top tube is provided with an adjustment component that can position or unlock the lower end of the top tube from the sliding tube. The mechanism is characterized in that a mounting base is connected to the outer wall of the upper end of the base tube, and an elastic element with one end always having a tendency to move laterally into the base tube is provided within the mounting base. The upper end of the base tube has a clearance hole for the elastic element to pass through, and the lower end of the sliding tube has a positioning hole for the elastic element to pass through. The lower end of the top tube has a wedge-shaped portion, and the top tube can slide downwards to move the wedge-shaped portion out of the positioning hole.

[0009] The lifting mechanism can be used alone for tables, chairs, or as part of a table and chair combination.

[0010] Working Principle: During normal use, the jacking tube can be pulled upwards from the sliding tube, and the positioning between the sliding tube and the lower end of the jacking tube can be achieved through the adjustment component. Continuing to pull the jacking tube upwards causes the sliding tube to slide upwards synchronously, allowing it to be pulled out from the bottom tube. The lower end of the bottom tube is connected to the table leg or chair leg. An elastic element is connected to a mounting base on the outer wall of the bottom tube. Under the action of elastic force, one end of the elastic element always tends to move towards the inside of the bottom tube. When the sliding tube moves to a position where the positioning hole and the clearance hole at the lower end of the sliding tube are aligned, the elastic element moves towards the positioning hole under the action of elastic force, and one end of the elastic element passes through the positioning hole. This allows the jacking tube to slide to a higher height from the ground, while the table or chair body... The top tube rises and falls synchronously. Since the table or chair legs are connected to the bottom tube, and the table or chair body is connected to the top tube, the lifting stroke of the table or chair body is realized. When the top tube needs to be lowered to the lowest position, the adjustment component is first unlocked. The top tube slides down and then abuts against the sliding tube. At this time, the top tube can drive the sliding tube to slide down synchronously. When it slides to the elastic element, the wedge-shaped part of the top tube can push the elastic element inserted in the positioning hole out of the positioning hole, thereby releasing the lock between the sliding tube and the bottom tube. This allows the sliding tube to slide along the bottom tube until the lower end of the sliding tube is located at the lower end of the bottom tube, so that the top tube can be lowered to the lowest position. The table or chair body rises and falls synchronously with the top tube, thereby increasing the lifting stroke of the table and chair seat in actual use.

[0011] By using a combination of jacking pipe, sliding pipe, and bottom pipe, the system can achieve the desired result by simply unlocking the adjusting component of the jacking pipe and pulling it up or down. During this process, the sliding pipe and bottom pipe can be locked and unlocked without needing to unlock the part located below the jacking pipe, thus enhancing the linkage. Furthermore, the use of three pipes allows for a further increase in the lifting stroke of the jacking pipe.

[0012] To further increase the lifting stroke, the sliding tube can be a multi-section sliding tube. The upper outer wall of the sliding tube is provided with the aforementioned mounting seat, and the aforementioned elastic element is provided inside the mounting seat. The lower end of the sliding tube is fitted with a wedge-shaped part, and the side wall of the lower end of the sliding tube is provided with a positioning hole for the elastic element located in another sliding tube or bottom tube adjacent to the sliding tube to pass through. When the multi-stage sliding tube extends, simply pull the top tube upwards. After the top tube is positioned with the uppermost sliding tube via the adjusting component, it moves the uppermost sliding tube upwards to the positioning hole of the elastic element of the adjacent sliding tube, thus achieving positioning between the uppermost sliding tube and the adjacent sliding tube. Similarly, after the adjacent sliding tube moves synchronously with the uppermost sliding tube, the adjacent sliding tube and other sliding tubes are positioned sequentially in the same way. When the multi-stage sliding tube retracts, press the top tube downwards. The top tube releases its positioning with the uppermost sliding tube via the adjusting component, and the wedge-shaped part of the top tube pushes out the corresponding positioning hole of the elastic element of the adjacent sliding tube. The top tube and the uppermost sliding tube continue to slide downwards synchronously. The wedge-shaped part at the lower end of the uppermost sliding tube pushes out the corresponding positioning hole of the elastic element of the adjacent sliding tube, thus releasing the positioning between the adjacent sliding tube and the other sliding tube. The other sliding tubes are released from positioning sequentially in the same way, thereby achieving the retraction of the multi-stage sliding tube.

[0013] The aforementioned lifting mechanism is mainly used on desks and chairs for students during lunch breaks. Since the height of the tabletop and chair body usually needs to be adjusted during lunch breaks, the lifting mechanism is primarily used on lunch break desks and chairs. Adjustment is achieved simply by adjusting the adjustment components inside the top tube and then pulling the top tube, allowing for rapid raising and lowering of the tabletop and chair body. This facilitates students' lunch break. When a nap is needed, the tabletop can be adjusted to a higher height to make room for the chair back, or the chair body can be raised and then the chair back can be folded down. This avoids the need for a large lifting stroke of the tabletop, reduces the pressure on students' heads when placed under the tabletop, and improves their lunch break experience.

[0014] In the above-mentioned lifting mechanism for tables or chairs, the wedge-shaped part is provided at the lower end of the top tube, the outer side wall of the lower end of the top tube is close to the inner side wall of the lower end of the sliding tube, the positioning hole is opened on the side wall of the lower end of the sliding tube, and there is a gap between the lower hole wall of the positioning hole and the lower end face of the sliding tube.

[0015] By setting the wedge-shaped part at the lower end of the jacking tube, the lifting stroke of the wedge-shaped part is the same as that of the lower end of the jacking tube. There is a gap between the lower wall of the positioning hole and the lower end face of the sliding tube. During the downward sliding of the lower end of the jacking tube, the wedge-shaped part is ensured to be at least partially aligned with the positioning hole. Furthermore, by having the outer side wall of the lower end of the jacking tube close to the inner side wall of the lower end of the sliding tube, the wedge-shaped part can quickly push the end of the elastic element out of the positioning hole. At this time, the sliding tube can slide up and down along the bottom tube, thereby improving the stability of the lifting mechanism during adjustment.

[0016] The elastic element consists of a U-shaped spring sheet and a spring post connected to one side of the U-shaped spring sheet and able to be embedded in the positioning hole. The U-shaped spring sheet has good stability and is easy to set, making it convenient for installation and adjustment of stability.

[0017] The elastic element can also be a spring. A spring post that can be embedded in the positioning hole is fixed to one end of the spring. Since springs are relatively common parts, the manufacturing cost is lower and the installation is more convenient. In order to improve the stability of the spring setting, a guide post that can be sleeved on the spring can be set in the mounting base. The length of the guide post is less than the stroke of the spring post.

[0018] The aforementioned elastic element can also be other elastic parts besides springs or U-shaped spring sheets. However, a spring post needs to be provided at one end of the elastic element, and the end face of the spring post away from the elastic element is an arc-shaped surface, a spherical surface, or a wedge-shaped surface, preferably a spherical surface. The spherical surface facilitates the stable unlocking of the bottom tube and the sliding tube when the wedge part pushes out one end of the spring post, further improving the stability and convenience of the lifting mechanism during adjustment.

[0019] In the aforementioned lifting mechanism for tables or chairs, one side of the wedge-shaped portion is recessed inward to form a wedge-shaped surface, which gradually moves away from the inner wall of the sliding tube from the upper end to the lower end.

[0020] By setting the wedge shape, the end of the elastic element can be stably pushed out when the wedge slides downward, and the setting of the wedge does not affect the normal sliding of the jacking tube, thereby improving the stability of the lifting mechanism's sliding.

[0021] In the above-mentioned lifting mechanism for tables or chairs, a mounting sleeve is fitted onto the upper end of the bottom tube, and the side wall of the lower end of the mounting sleeve protrudes outward to form the mounting seat. The clearance hole is opened on the side wall of the upper end of the bottom tube.

[0022] The mounting sleeve facilitates the installation of the mounting base and allows the elastic element inside the mounting base to be aligned with the clearance hole, making the assembly of the entire lifting mechanism more convenient. It also facilitates the drilling of the clearance hole. Since the clearance hole is for the end of the elastic element to pass through, the clearance hole also plays a guiding role during the process of the elastic element passing through the clearance hole and being positioned on the positioning hole. This ensures the stability of the positioning and the convenience of installation and calibration while maximizing the lifting stroke.

[0023] In the above-mentioned lifting mechanism for tables or chairs, the mounting base includes a mounting wall that is laterally opposite to the outer wall of the bottom tube and a blocking wall that is connected to both sides of the mounting wall. A baffle is provided above or below the mounting wall. The mounting wall, the two blocking walls and the baffle together form a cavity for placing an elastic element.

[0024] The installation wall facilitates the installation of elastic component one, while the limiting wall and baffle prevent the operator's hand from getting stuck in the cavity and getting scratched, and also prevent other large foreign objects from entering the cavity. The upper or lower opening facilitates the installation and maintenance of elastic component one.

[0025] There is a clearance between the blocking wall and the outer wall of the bottom pipe. This facilitates the removal of the mounting sleeve, making its installation easier and simpler.

[0026] In the aforementioned lifting mechanism for tables or chairs, the lower end of the sliding tube has a limiting block, and the lower end or wedge-shaped portion of the top tube can abut against the upper end of the limiting block.

[0027] This structure allows the sliding tube to slide downwards stably after the jacking tube is released from its positioning position with the sliding tube, thanks to the setting of the limiting block, thus improving the stability of the adjustment.

[0028] In the above-mentioned lifting mechanism for tables or chairs, a long-stroke limiting hole is provided on the side wall of the upper end of the sliding tube. The adjusting component includes an elastic element two that passes through the lower end of the top tube and can be embedded in the long-stroke limiting hole. The adjusting component can drive the elastic element two to move out of the long-stroke limiting hole. When the top tube slides along the sliding tube to the point where the elastic element two is directly opposite the long-stroke limiting hole, the end of the elastic element two is inserted into the long-stroke limiting hole.

[0029] The position of the long stroke limiting hole allows the jacking tube to slide along the sliding tube at its maximum stroke. The elastic element 2 is installed on the long stroke limiting hole at the top of the sliding tube, which increases the lifting stroke of the lifting mechanism. However, for the convenience of users, usually only one long stroke limiting hole is sufficient to meet the needs of use, thereby increasing the lifting stroke while reducing the adjustment difficulty of the lifting mechanism.

[0030] The adjustment assembly includes an adjustment lever hinged in the middle of the jacking pipe. The upper end of the adjustment lever has an adjustment button, and the second elastic element is located at the lower end of the adjustment lever. The adjustment button can drive the adjustment lever to swing around the connection point, causing one end of the second elastic element to retract and move out of the adjustment limit hole or the long stroke limit hole.

[0031] The adjustment component uses an adjustment lever design, which allows for easy adjustment by simply pressing the adjustment button to unlock and slide the jacking tube within the sliding tube. This enhances the convenience of adjustment, allowing students to simply press the adjustment button at the top of the jacking tube and pull it to slide. The second elastic element consists of a U-shaped spring and a spring post, with the spring post passing through the long-stroke limiting hole for positioning.

[0032] In the above-mentioned lifting mechanism for tables or chairs, multiple adjustment limiting holes are provided on the side wall of the lower end of the sliding tube. Each adjustment limiting hole is distributed sequentially along the length of the sliding tube. The adjustment component can drive the elastic element two to move out of the adjustment limiting hole. When the top tube slides along the sliding tube to the point where the elastic element two is directly opposite any one of the adjustment limiting holes, the end of the elastic element two is inserted into the adjustment limiting hole.

[0033] By providing an adjustment limit hole at the lower end of the sliding tube, the elastic element 2 in the adjustment assembly can be inserted into any adjustment limit hole when the top tube slides along the sliding tube. This allows for adjustment of the position between the sliding tube and the top tube, enabling the lifting mechanism to have multiple height adjustments and improving its practicality.

[0034] Since the height adjustment mechanism serves as the legs of both desks and chairs, and students in each class typically have different heights, setting multiple height adjustment levels makes it easier for desks and chairs to suit students of different heights, improving user convenience. Furthermore, desks may need to serve multiple purposes, such as using the tabletop as a drawing board or for other uses. Therefore, adjusting the height of the desk legs facilitates multi-functional use by students, further enhancing their convenience.

[0035] The above only describes the adjustment limit hole on the sliding tube, which is suitable for adjusting the length of the top tube, sliding tube and bottom tube when they are relatively short. In this case, the adjustment limit hole of the sliding tube is located above the top end of the bottom tube, which is convenient for lower grade students to use.

[0036] During the setup process, there is a gap between the bottom long-stroke limit hole and the top adjustment limit hole to prevent them from interfering with each other and to improve the stability of the lifting mechanism's rapid adjustment.

[0037] In the aforementioned lifting mechanism for tables or chairs, the adjustment limit hole and the long stroke limit hole are both located on the side wall of one side of the sliding tube, and the positioning hole is located on the side wall of the other side of the sliding tube.

[0038] The design of this structure ensures that the drilling positions of the adjustment limit hole, the long stroke limit hole, and the positioning hole do not interfere with each other. It also allows the elastic element two of the adjustment component and the elastic element one of the mounting base to be positioned on both sides. When the top tube is pulled to its maximum stroke, the stability of the sliding tube is improved by limiting both sides of the sliding tube, thus avoiding large shaking.

[0039] In the above-mentioned lifting mechanism for tables or chairs, multiple adjustment clearance holes or at least one adjustment clearance groove are provided on the side wall of the lower end of the bottom tube, and the end of the elastic member II, which passes through the adjustment limit hole, is located in one of the adjustment clearance holes or one of the adjustment clearance grooves.

[0040] By adjusting the clearance hole and the clearance groove to allow clearance at the end of the second elastic element, this structure is convenient when the lengths of the top tube, sliding tube and bottom tube are set to be relatively long. It is necessary to place the sliding tube inside the bottom tube and adjust the positional relationship between the sliding tube and the top tube inside the bottom tube by adjusting the second elastic element on the adjustment assembly. However, during adjustment, the adjustment limit hole of the sliding tube can also be positioned above the upper end of the bottom tube for adjustment, which improves the multi-level adjustment range of the lifting mechanism.

[0041] In practical use, when the lengths of the jacking pipe, sliding pipe, and bottom pipe are set to be relatively long, it is unnecessary to pull the sliding pipe out of the bottom pipe and then slide the jacking pipe to adjust the height. Setting the sliding pipe inside the bottom pipe can meet the adjustment requirements. Therefore, the use of holes or slots facilitates the adjustment of the position of the sliding pipe and the jacking pipe, improving the convenience of adjustment.

[0042] The diameter of the adjusting relief hole is larger than that of the adjusting limit hole, or the transverse groove diameter of the adjusting relief groove is larger than that of the limiting adjusting hole. This structure ensures that the adjusting relief hole and adjusting relief groove do not contact the end of the elastic element two, avoiding friction between the elastic element two and the adjusting relief hole or adjusting relief groove, thus making the positioning of the adjusting assembly more accurate and faster.

[0043] Compared with existing technologies, the lifting mechanism for tables or chairs has the following advantages:

[0044] 1. By using the coordinated design of the top tube, sliding tube, and bottom tube, it is possible to unlock the top tube adjustment component and pull the top tube up or down. During this process, the sliding tube and bottom tube are locked and unlocked. It is not necessary to unlock the part located below the top tube, thereby enhancing the linkage. Furthermore, the three tubes allow the lifting stroke of the top tube to be further increased, thus improving the lifting stroke of the tabletop and chair body.

[0045] 2. The position setting of the long stroke limit hole allows the maximum stroke of the top tube to slide along the sliding tube to be the long stroke limit hole at the top of the sliding tube, which increases the lifting stroke of the lifting mechanism. However, for the convenience of users, usually only one long stroke limit hole is sufficient to meet the usage requirements, thereby reducing the adjustment difficulty of the lifting mechanism while increasing the lifting stroke.

[0046] 3. The wedge-shaped part is set at the lower end of the jacking tube, so that the lifting stroke of the wedge-shaped part is the same as the lifting stroke of the lower end of the jacking tube. There is a gap between the lower wall of the positioning hole and the lower end face of the sliding tube. During the downward sliding of the lower end of the jacking tube, the wedge-shaped part is aligned with the positioning hole. The outer side wall of the lower end of the jacking tube is close to the inner side wall of the lower end of the sliding tube, which ensures that the wedge-shaped part can quickly push the end of the elastic element out of the positioning hole. At this time, the sliding tube can slide up and down along the bottom tube, thereby improving the stability of the lifting mechanism during adjustment. Attached Figure Description

[0047] Figure 1 This is one of the structural schematic diagrams of the maximum stroke of the three tubes in this embodiment.

[0048] Figure 2 This is the second schematic diagram of the maximum stroke of the three tubes in this embodiment.

[0049] Figure 3 yes Figure 1 Top view.

[0050] Figure 4 yes Figure 3 Sectional view of AA.

[0051] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0052] Figure 6 yes Figure 4 A magnified view of a section at point B.

[0053] Figure 7 This is a schematic diagram of the minimum stroke of the three tubes in this embodiment.

[0054] Figure 8This is a cross-sectional view of the three pipes in the minimum stroke state in this embodiment.

[0055] Figure 9 yes Figure 8 A magnified view of a section at point C.

[0056] Figure 10 yes Figure 8 A magnified view of a section at point D.

[0057] Figure 11 This is one of the structural schematic diagrams of Embodiment 4.

[0058] Figure 12 This is the second structural schematic diagram of Embodiment 4.

[0059] Figure 13 This is a structural schematic diagram of Embodiment 5.

[0060] Figure 14 This is a structural schematic diagram of Embodiment Six.

[0061] Figure 15 This is a structural schematic diagram of Embodiment Seven.

[0062] In the diagram, 1. Bottom tube; 11. Clearance hole; 12. Mounting sleeve; 12a. Limiting stop; 13. Adjusting clearance hole; 14. Adjusting clearance groove; 2. Sliding tube; 21. Positioning hole; 22. Long stroke limiting hole; 23. Adjusting limiting hole; 24. Sliding sleeve; 25. Limiting block; 3. Top tube; 31. Wedge-shaped part; 31a. Wedge-shaped surface; 4. Adjusting assembly; 41. Adjusting lever; 42. Elastic component two; 43. Adjusting button; 5. Elastic component one; 6. Mounting seat; 61. Mounting wall; 62. Blocking wall; 63. Baffle; 64. Cavity; 65. Clearance gap; 7. Gap; 8. Spacing; 9. Table; 91. Tabletop; 92. Table legs; 10. Chair; 101. Chair body; 101a. Seat; 101b. Armrest; 101c. Backrest; 102. Chair legs. Detailed Implementation

[0063] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0064] Example 1:

[0065] like Figure 1As shown, the lifting mechanism for tables or chairs includes a base tube 1, a sliding tube 2 inserted into the base tube 1, and a top tube 3 inserted into the sliding tube 2. The lower end of the base tube 1 is connected to the table leg 92 of the table 9 or the chair leg 102 of the chair 10. The upper end of the top tube 3 is connected to the tabletop 91 of the table 9 or the chair body 101 of the chair 10. The top tube 3 is provided with an adjustment component 4 that can position or unlock the lower end of the top tube 3 from the sliding tube 2.

[0066] Specifically, such as Figure 1-10 As shown, a mounting base 6 is connected to the outer wall of the upper end of the bottom tube 1. An elastic element 5 is provided in the mounting base 6, which always has a tendency to move laterally into the bottom tube 1. A clearance hole 11 is opened at the upper end of the bottom tube 1 for the elastic element 5 to be partially embedded. A positioning hole 21 is opened at the lower end of the sliding tube 2 for the elastic element 5 to pass through. The lower end of the top tube 3 has a wedge-shaped part 31. The top tube 3 can slide downward so that the wedge-shaped part 31 moves the elastic element 5 out of the positioning hole.

[0067] like Figure 4-6 As shown, a long-stroke limiting hole 22 is provided on the side wall of the upper end of the sliding tube 2. The adjustment component 4 includes an adjustment lever 41 hinged in the middle of the top tube 3 and an elastic element 42 that passes through the lower end of the top tube 3 and can be embedded in the long-stroke limiting hole 22. The upper end of the adjustment lever 41 has an adjustment button 43 with its end protruding from the top tube 3 and arranged horizontally. The elastic element 42 is located at the lower end of the adjustment lever 41. The adjustment button 43 can drive the adjustment lever 41 to swing around the connection point, causing one end of the elastic element 42 to retract and move out of the long-stroke limiting hole 22. When the top tube 3 slides along the sliding tube 2 to the point where the elastic element 42 is directly opposite the long-stroke limiting hole 22, the end of the elastic element 42 is inserted into the long-stroke limiting hole 22. The elastic element 42 is a U-shaped spring and a spring post. The spring post passes through the long-stroke limiting hole 22 and achieves positioning.

[0068] like Figure 2-6 As shown, in this embodiment, when the lengths of the top pipe 3, sliding pipe 2, and bottom pipe 1 are set to be relatively short, multiple adjustment limiting holes 23 are provided on the side wall of the lower end of the sliding pipe 2. Each adjustment limiting hole 23 is distributed sequentially along the length direction of the sliding pipe 2. The adjustment component 4 can drive the elastic element 42 to move out of the adjustment limiting hole 23. When the top pipe 3 slides along the sliding pipe 2 to the point where the elastic element 42 is directly opposite any adjustment limiting hole 23, the end of the elastic element 42 is inserted into the adjustment limiting hole 23. In this embodiment, there is one long stroke limiting hole 22. There is a gap 7 between the long stroke limiting hole 22 and the uppermost adjustment limiting hole 23. The adjustment limiting hole 23 and the long stroke limiting hole 22 are both located on the side wall of one side of the sliding pipe 2, and the positioning hole 21 is located on the side wall of the other side of the sliding pipe 2.

[0069] like Figure 8-10As shown, the wedge-shaped part 31 is provided at the lower end of the top tube 3. The outer side wall of the lower end of the top tube 3 is close to the inner side wall of the lower end of the sliding tube 2. The positioning hole 21 is opened on the side wall of the lower end of the sliding tube 2, and there is a gap 8 between the lower hole wall of the positioning hole 21 and the lower end face of the sliding tube 2. The wedge-shaped part 31 is a wedge-shaped sleeve that is fitted onto the lower end of the top tube 3. One side of the wedge-shaped part 31 is recessed inward to form a wedge-shaped surface 31a. The wedge-shaped surface 31a gradually moves away from the inner wall of the sliding tube 2 from the upper end to the lower end. The elastic element 5 is a U-shaped spring sheet and a spring post connected to one side of the U-shaped spring sheet and can be embedded in the positioning hole 21.

[0070] The lower end of the sliding tube 2 has a limiting block 25. When the lower end of the top tube 3 or the wedge-shaped part 31 abuts against the upper end of the limiting block 25, the long-stroke limiting hole 22 of the sliding tube 2 is located outside the bottom tube 1. This structure allows the sliding tube 2 to slide downward stably after the top tube 3 is released from its positioning with the sliding tube 2, thanks to the limiting block 25. This improves the stability of the adjustment and ensures that the elastic element 42 inside the top tube 3 can be inserted into the long-stroke limiting hole 22 during sliding, thereby pulling the sliding tube 2 out.

[0071] like Figure 2 and Figure 5 As shown, a mounting sleeve 12 is fitted onto the upper end of the bottom tube 1. The side wall of the lower end of the mounting sleeve 12 protrudes outward to form the mounting seat 6. A clearance hole 11 is opened on the side wall of the upper end of the bottom tube 1. The upper end of the mounting sleeve 12 protrudes laterally to form a limiting stop 12a provided on the upper end of the bottom tube 1. The upper end of the sliding tube 2 has a sliding sleeve 24. The top tube 3 slides along the inner side wall of the upper end of the sliding sleeve 24. The sliding tube 2 slides along the inner side wall of the limiting stop 12a. The mounting seat 6 includes a mounting wall 61 that is laterally opposite to the outer side wall of the bottom tube 1 and a blocking wall 62 that is connected to both sides of the mounting wall 61. A baffle 63 is provided above or below the mounting wall 61. The mounting wall 61, the two blocking walls 62 and the baffle 63 together form a cavity 64 for the elastic member 5 to be placed. There is a clearance gap 65 between the blocking wall 62 and the outer side wall of the bottom tube 1.

[0072] Example 2:

[0073] The content of this embodiment is basically the same as that of embodiment one, except that: the elastic element 5 can be a spring, and a spring post that can be embedded in the positioning hole 21 is fixed at one end of the spring.

[0074] Example 3:

[0075] The content of this embodiment is basically the same as that of embodiment one, except that: the elastic element 2 42 can be a spring, and a spring post that can be embedded in the adjustment limit hole 23 or the long stroke limit hole 22 is fixed at one end of the spring.

[0076] Example 4

[0077] The content of this embodiment is basically the same as that of Embodiment 1, except that: Figure 11 and Figure 12 As shown, in this embodiment, when the lengths of the top pipe 3, sliding pipe 2, and bottom pipe 1 are set to be relatively long, multiple adjustment clearance holes 13 or at least one adjustment clearance groove 14 are provided on the side wall at the lower end of the bottom pipe 1. The end of the elastic element 42 passing through the adjustment limiting hole 23 is located in one of the adjustment clearance holes 13 or one of the adjustment clearance grooves 14. The diameter of the adjustment clearance holes 13 is larger than the diameter of the adjustment limiting hole 23, or the transverse groove diameter of the adjustment clearance groove 14 is larger than the diameter of the limiting adjustment hole.

[0078] Example 5:

[0079] like Figure 13 As shown, a table includes a tabletop 91 and table legs 92 disposed below the tabletop 91. The lifting mechanism described in Embodiment 1, Embodiment 2, Embodiment 3, or Embodiment 4 is disposed between the tabletop 91 and the table legs 92. The lower end of the bottom tube 1 is fixedly connected to the table legs 92, and the upper end of the top tube 3 is fixedly connected to the tabletop 91.

[0080] Example 6:

[0081] like Figure 14 As shown, a chair includes a chair body 101 and a chair base 102 disposed below the chair body 101. The chair body 101 includes a seat plate 101a. The lifting mechanism of the above embodiment 1, embodiment 2, embodiment 3, or embodiment 4 is disposed between the seat plate 101a and the chair base 102. The lower end of the bottom tube 1 is fixedly connected to the chair base 102, and the upper end of the top tube 3 is fixedly connected to the seat plate 101a.

[0082] Example 7:

[0083] like Figure 15 As shown, a chair includes a chair body 101 and a base 102 disposed below the chair body 101. The chair body 101 includes a seat 101a, an armrest 101b, and a backrest 101c hinged to the rear end of the seat 101a. The rear end of the armrest 101b is hinged to the middle of the outer edge of one side of the backrest 101c. The lifting mechanism of the above embodiment one, two, three, or four is disposed between the armrest 101b and the base 102. The lower end of the bottom tube 1 is fixedly connected to the base 102, and the upper end of the top tube 3 is fixedly connected to the armrest 101b.

[0084] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A lifting mechanism for a table or chair, comprising a base tube (1), a sliding tube (2) inserted into the base tube (1), and a top tube (3) inserted into the sliding tube (2), wherein the lower end of the base tube (1) is connected to the table leg (92) of a table (9) or the chair leg (102) of a chair (10), and the upper end of the top tube (3) is connected to the tabletop (91) of the table (9) or the chair body (101) of the chair (10), wherein the top tube (3) is provided with an adjusting component (4) for positioning or unlocking the lower end of the top tube (3) from the sliding tube (2), characterized in that, A mounting base (6) is connected to the outer wall of the upper end of the bottom tube (1). An elastic element (5) with one end always having a tendency to move laterally into the bottom tube (1) is provided in the mounting base (6). A clearance hole (11) is provided at the upper end of the bottom tube (1) for the elastic element (5) to be partially embedded. A positioning hole (21) is provided at the lower end of the sliding tube (2) for the elastic element (5) to pass through. A wedge-shaped part (31) is provided at the lower end of the top tube (3). The top tube (3) can slide downward so that the wedge-shaped part (31) moves the elastic element (5) out of the positioning hole (21).

2. The lifting mechanism for a table or chair according to claim 1, characterized in that, The wedge-shaped part (31) is provided at the lower end of the top tube (3), the outer side wall of the lower end of the top tube (3) is close to the inner side wall of the lower end of the sliding tube (2), and the positioning hole (21) is opened on the side wall of the lower end of the sliding tube (2).

3. The lifting mechanism for a table or chair according to claim 1 or 2, characterized in that, One side of the wedge-shaped portion (31) is recessed inward to form a wedge-shaped surface (31a), and the wedge-shaped surface (31a) gradually moves away from the inner wall of the sliding tube (2) from the upper end to the lower end.

4. The lifting mechanism for a table or chair according to claim 1 or 2, characterized in that, The upper end of the bottom tube (1) is fitted with a mounting sleeve (12), and the side wall of the lower end of the mounting sleeve (12) protrudes outward to form the mounting seat (6). The clearance hole (11) is opened on the side wall of the upper end of the bottom tube (1).

5. The lifting mechanism for a table or chair according to claim 4, characterized in that, The mounting base (6) includes a mounting wall (61) that is laterally opposite to the outer wall of the bottom tube (1) and a blocking wall (62) that is connected to both sides of the mounting wall (61). A baffle (63) is provided above or below the mounting wall (61). The mounting wall (61), the two blocking walls (62) and the baffle (63) together form a cavity (64) for placing the elastic element (5).

6. The lifting mechanism for a table or chair according to claim 4, characterized in that, The lower end of the sliding tube (2) has a limiting block (25), and the lower end or wedge-shaped part (31) of the top tube (3) can abut against the limiting block (25).

7. The lifting mechanism for a table or chair according to claim 1, characterized in that, The upper side wall of the sliding tube (2) is provided with a long stroke limiting hole (22). The adjustment component (4) includes an elastic element two (42) that passes through the lower end of the top tube (3) and can be embedded in the long stroke limiting hole (22). The adjustment component (4) can drive the elastic element two (42) to move out of the long stroke limiting hole (22). When the top tube (3) slides along the sliding tube (2) to the point where the elastic element two (42) is directly opposite the long stroke limiting hole (22), the end of the elastic element two (42) is inserted into the long stroke limiting hole (22).

8. The lifting mechanism for a table or chair according to claim 7, characterized in that, Multiple adjustment limiting holes (23) are provided on the side wall at the lower end of the sliding tube (2). Each adjustment limiting hole (23) is distributed sequentially along the length direction of the sliding tube (2). The adjustment component (4) can drive the elastic element two (42) to move out of the adjustment limiting hole (23). When the top tube (3) slides along the sliding tube (2) to the point where the elastic element two (42) is directly opposite any one of the adjustment limiting holes (23), the end of the elastic element two (42) is inserted into the adjustment limiting hole (23).

9. The lifting mechanism for a table or chair according to claim 8, characterized in that, The adjustment limiting hole (23) and the long stroke limiting hole (22) are both located on the side wall of one side of the sliding tube (2), and the positioning hole (21) is located on the side wall of the other side of the sliding tube (2).

10. The lifting mechanism for a table or chair according to claim 8 or 9, characterized in that, The bottom tube (1) has multiple adjustment relief holes (13) or at least one adjustment relief groove (14) on the side wall at the lower end. The end of the elastic member 2 (42) passing through the adjustment limiting hole (23) is located in one of the adjustment relief holes (13) or one of the adjustment relief grooves (14).

Images