Height-adjustable table

Abstract

The present invention discloses a height adjustable table, comprising a lifting column, a tabletop support bracket and a driving mechanism, wherein the lifting column is composed of a telescopic sleeve, and the telescopic sleeve comprises an outer sleeve and at least one inner sleeve. The tabletop support bracket is movably connected to the outer sleeve, and a connection position / area for the tabletop support bracket is formed on the side wall of the outer sleeve, and the tabletop support bracket is relatively fixed with the outer sleeve after adjusting the height from the ground according to the required installation position. The driving mechanism is configured to drive the lifting column to lift and lower, and the tabletop support bracket moves with the outer sleeve and stays at a preset position when the lifting and lowering stops. Compared with the prior art, the tabletop support bracket can be installed after adjusting the height from the ground according to the required installation position, so that the initial height of the tabletop support bracket is variable, thereby adapting to different lifting groups, and can be used by children and adults. During lifting and lowering, the inner sleeve does not move, and the driving mechanism drives the outer sleeve to lift and lower, so that the tabletop support bracket can be installed at any position of the outer sleeve and can be lifted and lowered smoothly.

Description

Technical Field

[0001] The present invention relates to the field of furniture, and in particular to a height adjustable table.Background Technology

[0002] For a height adjustable table, the height adjustment of the tabletop is its basic function. In order to meet the needs of people of different heights, manufacturers are working hard to expand the range of adjustment. The general height adjustable table is in this form, that is, the tabletop is supported by a beam, and the two ends of the beam are connected to the upper end of the table legs. The table legs are telescopic sleeves with screws installed inside, and the lifting and lowering of the tabletop is achieved through a worm gear mechanism.

[0003] For a height adjustable table, there are two important parameters: the adjustment range and the initial height. For a children's height adjustable table, the tabletop can be lowered to a height of 500mm. In order to achieve this goal, the column is often designed to be shorter, but because three-section / two-section screw rods are contained therein, the screw rod length is also shortened when the column is shortened, and the adjustment range is also shortened, making it only suitable for children.

[0004] For adult height adjustable tables, the minimum height of the tabletop from the ground is 650-750mm. In order to increase the adjustment range to meet the needs of taller people, under the premise of a certain installation distance (sleeve length), an additional screw and a first-level sleeve are usually added to increase the adjustment range of the column.

[0005] If the manufacturer uses three or more sections of the sleeve to achieve this goal, although the adjustment range adjustment range can be improved, various problems will also arise. First, the weight of the entire product will increase, and the corresponding processing cost and product selling price will also increase. Second, the height adjustable table has an extra section of the sleeve, the overall stability is difficult to guarantee, and the probability of problems is also increased. Third, correspondingly, the number of screw rod sections is also increased, but even in the fully extended state, there is an interlacing situation between the two adjacent sections of the screw rod, that is, the interlaced length cannot be utilized, so there is also a certain amount of waste.

[0006] Therefore, children's height adjustable tables and adult height adjustable tables are not interchangeable. Today, when people pay more and more attention to health, families can only buy the above two types of height adjustable tables for adults and children to use, which increases space occupancy and usage costs.

[0007] In order to solve the above problems, the applicant's prior patent application number: "202111361533.9" invention patent discloses a height adjustable table, which is provided with a long screw on each side, and a driving motor cooperates with the worm gear to apply a rotational force to the worm gear, so that the worm gear is lifted and lowered along the screw, and the driving motor also lifts and lowers the tabletop together. Because this height adjustable table has a screw on each side, the height of the tabletop can be adjusted to a lower level, and the maximum height of the tabletop can also be achieved by extending the length of the screw. Although the above patented technology can adjust the height of the tabletop to a relatively low or high level, there are the following problems: First, the long length of the screw leads to high processing costs and poor straightness. Second, the tabletop is supported by only two screws, and the stability is poor under long adjustment ranges.Summary of the Invention

[0008] In order to solve the above-mentioned technical problems, the present invention provides a height adjustable table, wherein the lifting column has at least two sections of sleeves, and only two sections of sleeves are required. The table board or tabletop support bracket can be installed on the outer sleeve after adjusting the height from the ground according to the required installation position, that is, according to user's needs, and the outer sleeve and the tabletop support bracket installed on the outer sleeve are driven to rise and fall by a driving mechanism. The overall structure is simple, the number of sleeves required is fewer, the weight is light, the cost is low and it is more stable, and it can adapt to both children and adults.

[0009] The technical solution of the present invention is achieved in this manner: a height adjustable table, comprises: a lifting column composed of a telescopic sleeve, and the telescopic sleeve comprising an outer sleeve and at least one inner sleeve; a tabletop support bracket movably connected to the outer sleeve, and the side wall of the outer sleeve being formed with a connection position / area for the tabletop support bracket, and the tabletop support bracket is relatively fixed with the outer sleeve after adjusting the height from the ground according to the required installation position; a driving mechanism being configured to drive the lifting column to move up and down, and at the same time, the tabletop support bracket moving with the outer sleeve and staying at a preset position when the lifting or lowering stops.

[0010] The tabletop support bracket of a general height adjustable table is directly installed on the upper end of the lifting column. When lifting, the tabletop support bracket is lifted by the upper end of the column, so that the initial height of the tabletop support bracket is linked to the length of the lifting column or the length of the sleeve, that is, the initial height of the tabletop support bracket of the same table is determined and cannot be changed. Therefore, in the present scheme, the tabletop support bracket can be installed after adjusting the height from the ground according to the required installation position, so that the initial height of the tabletop support bracket can be changed, so as to adapt to different lifting groups, and can be used by both children and adults; since the tabletop support bracket is no longer installed at the uppermost end of the lifting column, the lifting column must be inverted, that is, the outer sleeve is located above the inner sleeve, and when lifting, the inner sleeve does not move, and the driving mechanism drives the outer sleeve to lift and lower, so that no interference will occur, therefore, the tabletop support bracket can be installed at any position of the outer sleeve and can be lifted and lowered smoothly.

[0011] Preferably, a connection member for connecting with the outer sleeve is formed on both sides of the tabletop support bracket. After the connection member and the outer sleeve are relatively fixed, a gap is left between the upper end of the connection member and the upper end of the outer sleeve, and the outer sleeve part located in the gap forms a column head. The tabletop support bracket of a general height adjustable table is directly installed on the upper end of the lifting column, so there is no column head, and the column head can be used as a connection member for installing modular expansion parts. The upper end is open, and the side walls can be installed with expansion parts, so that the outer sleeve can be used for multiple purposes.

[0012] Preferably, the length of the column head is 2cm-90 cm. The length of the column head is determined by the installation height of the tabletop support bracket, but the column head always exists.

[0013] Preferably, the connection member is sleeve-shaped, which is sleeved on the outer sleeve and locked by a clamping method, a cam wrench or a screw. The connection member and the outer sleeve are detachable, rather than being always fixed like welding.

[0014] Preferably, the tabletop support bracket has a supporting part for supporting the table, the upper end of the supporting part forms a supporting surface, the supporting surface is lower or higher than the upper end of the connection member, or the supporting surface is flush with the upper end of the connection member. By adjusting the shape and height relationship between the supporting part and the connection member, a variety of options are provided for adjusting the installation distance of the table.

[0015] Preferably, a bracket above the table is connected to the column head, and the bracket above the table is configured to place or hang items. The bracket above the table is the modular expansion piece.

[0016] Preferably, the bracket above the table is a single pillar, the pillar is sleeved on the column head, and a support plate or a hanging bracket is provided on the pillar.

[0017] Preferably, the bracket above the table includes a layer board spanning the left and right sides of the height adjustable table, and support columns are installed at both ends of the layer board, and the support columns are sleeved on the column heads.

[0018] Preferably, the driving mechanism includes an actuator and a push rod, the push rod is contained in the lifting column, and has a fixed section and a telescopic section. The fixed section is relatively fixed to the innermost inner sleeve, and a power input part is formed on the fixed section. The telescopic section is relatively fixed to the outer sleeve, wherein the power input part and the actuator are both arranged close to the ground. The driving force of the actuator is transmitted to the push rod through the power input part, so that the push rod drives the inner and outer sleeves to complete telescopic lifting or lowering. The actuator in the general height adjustable table driving mechanism is arranged below the tabletop or at the upper end of the lifting column, but because the tabletop support bracket in the present invention is not arranged at the upper end of the lifting column, if the actuator is still arranged at the upper end of the lifting column, it will appears to be more abrupt or intrusive, and it is more expensive to arrange the actuator below the tabletop support bracket, so it is low-cost and not abrupt or intrusive to arrange the actuator close to the ground.

[0019] Preferably, a transmission rod is further included, with both ends of the transmission rod respectively inserted into corresponding power input parts, and the actuator is configured to drive the transmission rod to rotate so that the lifting columns on both sides can be lifted and lowered synchronously. Similarly, the transmission rod is arranged at a position close to the ground.

[0020] Preferably, a cover is provided outside the transmission rod, the cover extends along the length direction of the transmission rod and covers the transmission rod and the actuator.

[0021] Preferably, the cover is also configured as a footrest of the height adjustable table. The cover also has a multi-purpose effect.

[0022] The design starting point, concept and beneficial effects of the present invention using the above technical solution are: For a formal height adjustable table, under the premise of the same installation distance (sleeve length), the adjustment range of a three-section lead screw must be longer than that of a two-section lead screw because it has an extra section. If the two-section lead screw is only for the same adjustment range as the three-section lead screw, the lead screw length and the installation distance (sleeve length) must be increased, but this will increase the initial height of the tabletop.

[0023] The driving mechanism is inverted, that is, the transmission position of the hexagonal rod is changed to be close to the ground, so that the installation position of the tabletop can be changed to any position of the outer sleeve. By using a more mature two-section lead screw, the adjustment range of the two-section lead screw can reach the adjustment range of the three-section lead screw by increasing the installation distance, but the initial height of the tabletop is not limited.

[0024] For conventional height adjustable tables, the travel or adjustment range determines the installation height. In the present invention, the adjustment range has no direct relationship with the installation height. Generally speaking, the initial height of the tabletop determines the adjustment range of the lifting column (the higher the adjustment range, the greater the technical difficulty and the more material waste). The initial height of the tabletop and the adjustment range of the column of the height adjustable table frame of the present invention have no mutually restraining relationship. The column can reach the target adjustment range in the simplest way, and the initial height of the tabletop can be selected (adjusted) by oneself, and they are independent of each other.

[0025] Specifically, the tabletop support bracket of a general height adjustable table is directly installed on the upper end of the lifting column. When lifting, the tabletop support bracket is lifted by the upper end of the column, so that the initial height of the tabletop support bracket is linked to the length of the lifting column or the length of the sleeve, that is, the initial height of the tabletop support bracket of the same table is determined and cannot be changed. However, in the present scheme, the tabletop support bracket can be installed after adjusting the height from the ground according to the required installation position, so that the initial height of the tabletop support bracket can be variable, so as to adapt to different lifting groups, and can be used by both children and adults. Since the tabletop support bracket is no longer installed at the uppermost end of the lifting column, the lifting column must be inverted, that is, the outer sleeve is located above the inner sleeve, and when lifting or lowering, the inner sleeve does not move, and the driving mechanism drives the outer sleeve to lift and lower, so that no interference will occur, so that the tabletop support bracket can be installed at any position of the outer sleeve and can be lifted and lowered smoothly.

[0026] The tabletop support bracket of a general height adjustable table is directly installed on the upper end of the lifting column, so it does not have a column head. The column head can be used as a connecting piece for installing modular expansion parts. For example, the upper end of the bracket above the table and the column head are open, and the side walls can be installed with expansion parts, so that the outer sleeve can achieve multiple uses.Brief Description of The Drawings

[0027] FIG. 1 is a schematic diagram of a three-dimensional structure of a tabletop support bracket installed on a lifting column in an embodiment of the present invention; FIG. 2 is a schematic diagram of a three-dimensional structure of a tabletop installed on a tabletop support bracket in an embodiment of the present invention; FIG. 3 is a side view of a tabletop support bracket installed on a lifting column in an embodiment of the present invention; FIG. 4 is a schematic diagram of the three-dimensional structure of the tabletop support bracket in an embodiment of the present invention; FIG. 5 is a schematic diagram of a three-dimensional structure in which a friction locking mechanism locks a connection member on an outer sleeve in an embodiment of the present invention; FIG. 6 is an exploded view of a friction locking mechanism in an embodiment of the present invention; FIG. 7 is an exploded view of the push rod installed in the lifting column in an embodiment of the present invention; FIG. 8 is a schematic diagram of a three-dimensional structure in which a transmission rod and an actuator are located between table legs in an embodiment of the present invention; FIG. 9 is a schematic diagram of the three-dimensional structure of the height adjustable table in an embodiment of the present invention.

[0028] The figures and parts are by the reference numerals as follows: lifting column 1; outer sleeve 2; column head 21; inner sleeve 3; tabletop support bracket 4; connection member 41; supporting part 42; table leg 5; actuator 6; transmission rod 7; cover shell 8; tabletop or table board 9; bracket above the table 10; layer board 11; support column 12; through hole 13; rotating seat 14; friction block 15; handle 16; rotating shaft 17; cam 18; base 19; push rod 22; gear box 23; roller wheel 24; sleeve tube 25.Detailed Description of The Embodiments

[0029] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0031] In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] The specific implementation of the present invention is as follows: As shown in FIGS. 1 - 3, the present invention discloses a height adjustable table, comprising: a lifting column 1 comprising a telescopic sleeve, and the telescopic sleeve comprising an outer sleeve 2 and at least one inner sleeve 3; a tabletop support bracket 4 movably connected to the outer sleeve 2; wherein a side wall of the outer sleeve 2 is formed with a connection position / area for the tabletop support bracket 4, the tabletop support bracket 4 is relatively fixed to the outer sleeve 2 after adjusting the height from the ground according to the required installation position; a driving mechanism configured to drive the lifting column 1 to move up and down, and at the same time, the tabletop support bracket 4 is configured to move with the outer sleeve 2 and stay at a preset position when the lifting stops.

[0033] The tabletop support bracket 4 of a general height adjustable table is directly installed on the upper end of the lifting column 1. When it is lifted, the tabletop support bracket 4 is lifted by the upper end of the column, which makes the initial height of the tabletop support bracket 4 linked to the length of the lifting column 1 or the length of the sleeve, that is, the initial height of the tabletop support bracket 4 of the same table is determined and cannot be changed. However, in the present invention, the tabletop support bracket 4 can be installed after adjusting the height from the ground according to the required installation position, so that the initial height of the tabletop support bracket 4 can be changed, so as to adapt to people of different heights, and both children and adults can use it. Since the tabletop support bracket 4 is no longer installed on the uppermost end of the lifting column 1, the lifting column 1 must be in an inverted form, that is, the outer sleeve 2 is located above the inner sleeve 3, and when lifting or lowering, the inner sleeve 3 does not move, and the driving mechanism drives the outer sleeve 2 to lift and lower, so that no interference will occur. Therefore, the tabletop support bracket 4 can be installed at any position of the outer sleeve 2 and can be lifted and lowered smoothly.

[0034] Specifically, there are two groups of lifting columns 1, which are vertically arranged at intervals on the left and right. The telescopic sleeve of the lifting column 1 is a two-section telescopic sleeve, which has a total of an outer sleeve 2 and an inner sleeve 3. The outer sleeve 2 is sleeved on the inner sleeve 3 and is located above the inner sleeve 3. The outer sleeve 2 is driven to rise and fall on the inner sleeve 3 by a driving mechanism. The outer sleeve 2 and the inner sleeve 3 are both hollow cylinders with an oblong cross-section, and the connection position / location is formed in the middle and upper part of the outer sleeve 2. The connection position or connection location is the position where the tabletop support bracket 4 is connected to the outer sleeve 2, and a table board 9 is installed on the tabletop support bracket 4. When the tabletop support bracket 4 is connected to different connection positions or connected to different positions of the connection location, the table board 9 thereon can be at different initial heights.

[0035] Generally, there are multiple connection positions, which can be multiple sockets or bayonet sockets. The tabletop support bracket 4 is generally snap-fitted or plug-fitted with the outer sleeve 2, and the connection area is a range on the outer sleeve 2. The tabletop support bracket 4 can be directly locked at any position of the connection area by tight fit, and of course it can also be adjusted by unlocking the tight fit, which is more convenient to operate. Therefore, the tabletop support bracket 4 can be locked to the outer sleeve 2 by screw locking, pin plugging, etc., and can also be locked to the outer sleeve 2 by hugging, cam wrench, etc. In this embodiment, the tabletop support bracket 4 and the outer sleeve 2 adopt the second form of connection. Specifically, as shown in FIGS. 5 and 6, the connection members 41 for connecting to the outer sleeve 2 are formed on both sides of the tabletop support bracket 4, and the connection member 41 is connected to any position of the connection area of the outer sleeve 2, and is connected to the outer sleeve 2 by a friction locking mechanism. The connection member 41 is in the shape of a sleeve tube 25 , and is sleeved on the outer sleeve 2. A through hole 13 is opened on the inner side wall of the connection member 41, and a rotating seat 14 protruding from the side wall of the connection member 41 is provided on the front and rear sides of the through hole 13. The friction locking mechanism includes a friction block 15 and a handle 16. The friction block 15 is arranged in the through hole 13 and can contact the side wall of the outer sleeve 2 through the through hole 13. The handle 16 is arranged between the two rotating seats 14 through a rotating shaft 17, and the rotating shaft 17 is inserted on the two rotating seats 14; the head of the handle 16 is a cam 18, and the cam 18 contacts the friction block 15. When the handle 16 rotates, the cam 18 rotates accordingly, thereby controlling the friction block 15 to squeeze the side wall of the outer sleeve 2 or disengage from the side wall of the outer sleeve 2. When the friction block 15 squeezes the side wall of the outer sleeve 2, the tabletop support bracket 4 and the outer sleeve 2 can remain relatively fixed, and when the friction block 15 disengages from the side wall of the outer sleeve 2, the tabletop support bracket4 can be adjusted on the outer sleeve 2.

[0036] After the connection member 41 and the outer sleeve 2 are kept relatively fixed, a gap is left between the upper end of the connection member 41 and the upper end of the outer sleeve 2. At this time, the part of the outer sleeve 2 located in the gap forms a column head 21. The length of the column head 21 is 2cm -- 90cm and is adjusted according to the installation position of the tabletop support bracket 4; compared with the traditional height adjustable table in which the table board 9 is directly installed on the upper end of the column, the column head 21 provides more possibilities for the expansion of the height adjustable table. This is an additional advantage obtained after the inverted installation. The column head 21 can be used as a connecting piece for installing modular expansion parts, and its upper end opening and side walls can be used to install expansion parts, so that the outer sleeve 2 can achieve multiple uses. Nowadays, furniture multifunctionality has become a development trend. A single function can no longer meet people's needs, and different groups of people have different functional needs. If fixed components used to increase functionality are forcibly added to the height adjustable table, the height adjustable table's targeting will be weakened and the range of the target customers will be reduced, thus affecting the manufacturer's interests. But if the column head 21 can fully play its role, customers can detach and install customized functional expansion parts on it according to their own needs. That is, in addition to retaining the most basic usage functions, the height adjustable table can be customized to add the functional expansion parts required by the customer, making the height adjustable table of this embodiment more targeted and covering almost all people.

[0037] In this embodiment, as shown in FIG. 9, a bracket above the table 10 is connected to the column head 21, and the bracket above the table 10 is configured to place or hang items, and the bracket above the table 10 is the modular expansion part. The bracket above the table 10 can be a single pillar, and the pillar is sleeved on the column head 21, and a support plate or a hanger is provided on the pillar. In this embodiment, the bracket above the table 10 includes a layer board 11 spanning the left and right sides of the height adjustable table, and support columns 12 are installed at both ends of the layer board 11, and the support columns 12 are sleeved on the column head 21.

[0038] As shown in FIGS. 1 and 4, the tabletop support bracket 4 has a supporting part 42 for supporting the tabletop 9, and the supporting part 42 protrudes forward from the connection member 41 to increase the supporting area of the tabletop support bracket 4 in the front-to-back direction; the supporting part 42 can be integrally formed with the connection member 41, or can be detachably connected to the connection member 41. The upper end of the supporting part 42 forms a supporting surface, and the supporting surface is lower or higher than the upper end of the connection member 41, or the supporting surface is flush with the upper end of the connection member 41, and by adjusting the shape and height relationship of the supporting part 42 and the connection member 41, a variety of options are provided for adjusting the installation distance of the tabletop 9. In this embodiment, the supporting part 42 is integrally formed with the connection member 41, and the supporting surface of the supporting part 42 is flush with the upper end of the connection member 41, and the tabletop 9 is installed on the supporting surface and is mainly supported by the supporting part 42.

[0039] A table leg 5 is installed at the lower end of each lifting column 1, as shown in FIGS. 1 and 8, that is, the lower end of the inner sleeve 3 is inserted into the table leg 5, and the upper end of the inner sleeve 3 is always in the outer sleeve 2. The two table legs 5 are arranged at intervals on the left and right, and a base 19 is provided between the two table legs 5, and the base 19 is horizontally arranged on the two table leg 5 brackets and fixedly connected to the two table legs 5. The driving mechanism includes an actuator 6 and a push rod 22, the push rod 22 is vertically arranged in the lifting column 1, the push rod 22 has a fixed end and a telescopic end, the fixed end is relatively fixed with the lower end of the inner sleeve 3, and a gear box 23 is provided at the fixed end, which is the power input part of the push rod 22, and the telescopic end is relatively fixed with the outer sleeve 2. The actuator 6 is installed on the base 19 and is connected to the gear boxes 23 of the two push rods 22 through a transmission rod 7, that is, the actuator 6 is sleeved on the transmission rod 7. The two ends of the transmission rod 7 are respectively inserted into the gear boxes 23 of the two push rods 22. The actuator 6, the transmission rod 7 and the gear box 23 are all arranged close to the bottom surface. The actuator 6 drives the rotating rod to rotate, and the rotating rod drives the gear box 23 to move so that the push rods 22 on both sides are synchronously extended and retracted, and the retractable push rods 22 drive the inner sleeves 3 and the outer sleeves 2 on both sides to extend and retract synchronously. This scheme is like turning the entire height adjustable table frame upside down, especially the actuator 6 and the transmission rod 7, which are changed from being originally installed under the table board 9 or on the upper end of the lifting column 1 to being set close to the ground. The reason is that the tabletop support bracket 4 in this scheme is not set at the upper end of the lifting column 1, so the actuator 6 and the transmission rod 7 are still set at the upper end of the lifting column 1, which will appear more abrupt or intrusive, and it will be more expensive to set them below the tabletop support bracket4. Therefore, setting them close to the ground is low-cost and does not appear abrupt or intrusive.

[0040] A cover shell 8 is provided outside the transmission rod 7 and the actuator 6. The cover shell 8 is located above the base 19. The cover shell 8 extends along the length direction of the transmission rod 7 and covers the transmission rod 7 and the actuator 6. The cover shell 8 is located between the two table legs 5, and the two ends of the cover shell 8 are connected to the two table legs 5. Therefore, the cover shell 8 can also be used as a footrest for the height adjustable table, which has a multi-purpose effect. A roller wheel 24 is also provided at the rear end of the table leg 5. The height adjustable table can be easily moved when the height adjustable table is tilted so that only the roller wheel 24 contacts the ground. The table leg 5 includes a sleeve tube 25, and the lower end of the inner sleeve 3 is inserted in the sleeve tube 25. The sleeve tube 25 extends upward to increase the connection stability after the inner sleeve 3 and the table leg 5 are plugged in.

Claims

1. A height adjustable table, <b>characterized by comprising: a lifting column comprising a telescopic sleeve, and the telescopic sleeve comprising an outer sleeve and at least one inner sleeve; a tabletop support bracket movably connected to the outer sleeve, and a side wall of the outer sleeve being formed with a connection position or area for the tabletop support bracket, and the tabletop support bracket being relatively fixed with the outer sleeve after adjusting its height from the ground according to a required installation position; a driving mechanism configured to drive the lifting column to move up and down, and at the same time, the tabletop support bracket moves with the outer sleeve and stays at a preset position when the lifting stops.

2. The height adjustable table according to claim 1, wherein: connection members for connecting to the outer sleeve are formed on both sides of the tabletop support bracket; after the connection members and the outer sleeve are kept relatively fixed, a gap is left between an upper end of the connection members and an upper end of the outer sleeve, and a part of the outer sleeve located in the gap forms a column head .

3. The height adjustable table according to claim 2, wherein the length of the column head is 2cm - 90 cm.

4. The height adjustable table according to claim 2, wherein the connection member is sleeve-shaped, which is sleeved on the outer sleeve and locked by clamping, cam wrench or screws.

5. A height adjustable table according to claim 2, wherein the tabletop support bracket has a supporting part for supporting the tabletop, an upper end of the supporting part forms a supporting surface, the supporting surface is lower or higher than the upper end of the connection member, or the supporting surface is flush with the upper end of the connection member.

6. The height adjustable table according to claim 2, wherein a bracket above the table is connected to the column head, and the bracket above the table is configured to place or hang objects.

7. The height adjustable table according to claim 6, wherein the bracket above the table is a single pillar, the pillar is sleeved on the column head, and a support plate or a hanging bracket is provided on the pillar.

8. The height adjustable table according to claim 6, wherein the bracket above the table comprises a layer board spanning the left and right sides of the height adjustable table, and support columns are installed at both ends of the layer board, and the support columns are sleeved on the column heads.

9. A height adjustable table according to claim 1, wherein: the driving mechanism comprises an actuator and a push rod, the push rod is contained in the lifting column, the push rod has a fixed section and a telescopic section, the fixed section is relatively fixed to an innermost inner sleeve, and a power input part is formed on the fixed section; the telescopic section is relatively fixed to the outer sleeve, wherein the power input part and the actuator are both arranged close to the ground; a driving force of the actuator is adapted to be transmitted to the push rod through the power input part, so that the push rod drives the inner and outer sleeves to complete telescopic lifting and lowering.

10. A height adjustable table according to claim 9, further comprising a transmission rod, both ends of which are respectively inserted into corresponding power input parts, and the actuator is configured to drive the transmission rod to rotate so that the lifting columns on both sides can be lifted and lowered synchronously; similarly, the transmission rod is arranged at a position close to the ground.

11. The height adjustable table according to claim 10, wherein a cover is provided outside the transmission rod, the cover extends along the length direction of the transmission rod and covers the transmission rod and the actuator.

12. The height adjustable table according to claim 12, wherein the cover shell is additionally configured as a footrest of the height adjustable table.

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