Adjustable tabletop construction and height-adjustable table

Abstract

Adjustable tabletop construction, characterized by, that it comprises a table frame (1), a front tabletop (2) and a rear tabletop (3), wherein the said rear tabletop (3) is mounted on the said table frame (1) so as to be slid forwards and backwards, and wherein the rear end of the said front tabletop (2) is hinged to the front end of the said rear tabletop (3), and wherein the said front tabletop (2) is mounted on the front end of the said table frame (1) and can slide forwards and backwards synchronously with the said rear tabletop (3); and that the horizontal height of the front end of the said table frame (1) becomes lower than that of the upper end face of the said table frame (1) so that the said front table top (2) tilts downwards when moving forwards.

Description

Technical field

[0001] The present invention relates to the field of furniture technology, more precisely an adjustable tabletop construction and a height-adjustable table. Technical background

[0002] Tables are among the most versatile pieces of furniture in everyday life and are frequently used for studying, working, eating, and placing objects. A conventional table has a fixed, horizontal tabletop of unchanging size and a single purpose. With advancing technological developments, tables with sliding or tilting tabletops have become available to meet different usage needs. Such products usually have a tabletop that slides forwards and backwards to offer the user greater convenience; however, regardless of whether the tabletop is moved forwards or backwards, it always remains horizontal, which can be inconvenient for users when accessing the rear of the tabletop.Other tables are equipped with separate tilting mechanisms that allow the entire tabletop to be tilted or inclined, resulting in non-horizontal tabletops and a more complex overall structure. Therefore, there is still room for improvement in the user-friendliness of tables with sliding tabletops. Invention content

[0003] The aim of this invention is to provide an adjustable tabletop construction and a height-adjustable table to solve the technical problem of poor convenience with existing tabletops that can be moved forwards and backwards.

[0004] To achieve the aforementioned goal, the present invention offers an adjustable tabletop construction comprising a table frame, a front tabletop, and a rear tabletop. The rear tabletop is mounted on the table frame so as to be slid forwards and backwards, and the rear end of the front tabletop is hinged to the front end of the rear tabletop. The front tabletop is mounted at the front end of the table frame and can slide forwards and backwards synchronously with the rear tabletop. The horizontal height of the front end of the table frame is lower than that of the upper end face of the table frame so that the front tabletop tilts downwards when moved forwards.

[0005] Preferably, the table frame comprises a vertical pole. The horizontal height of the front end of the vertical pole is lower than that of the upper end face of the vertical pole, and the rear tabletop is mounted on the vertical pole so as to be slid forwards and backwards, while the front tabletop is mounted on the front end of the vertical pole so as to be slid forwards and backwards.

[0006] Preferably, the vertical rod comprises a horizontal section and an inclined section, wherein the rear end of the inclined section is connected to the front end of the horizontal section and the inclined section is inclined from back to front and from top to bottom; a rotatable sliding element is mounted at the front end of the inclined section and a sliding bushing is mounted on the underside of the rear table top, and the sliding bushing is provided with a sliding rail and the sliding element is slidably inserted into the sliding rail.

[0007] Preferably, the sliding bushing has a hollow interior, wherein the sliding rail is located in the lower end face of the sliding bushing and the height of the sliding bushing gradually decreases from front to back; the sliding part comprises a main body rotatably mounted on the front end of the inclined section and a sliding block detachably mounted on the upper end of the main body, and the sliding block is located inside the sliding bushing.

[0008] Preferably, an inclined bushing is mounted on the said inclined section, wherein the said sliding part is mounted at the front end of the said inclined bushing.

[0009] Preferably, the front end of the aforementioned inclined bushing is provided with a mounting section, and the mounting section has a hollow interior and is provided with first axis bores on both sides; the lower end of the aforementioned sliding part is provided with a second axis bore and the lower end of the aforementioned sliding part lies in the hollow space of the aforementioned mounting section, wherein a pin passes through the aforementioned first axis bore and the aforementioned second axis bore in order to rotatably mount the aforementioned sliding part on the aforementioned mounting section.

[0010] Preferably, it further comprises a drive mechanism, wherein said drive mechanism serves to cause said front tabletop and said rear tabletop to be moved synchronously forwards and backwards.

[0011] Preferably, the drive mechanism comprises a motor, a threaded rod and a nut seat, wherein the motor is mounted on the vertical rod and the threaded rod is in drive connection with the output end of the motor, and the nut seat is in threaded drive connection with the threaded rod and is connected to the underside of the rear table top.

[0012] Preferably, the threaded rod is located inside the vertical rod and the upper end face of the vertical rod is provided with a slotted hole, and a connecting block is mounted on the nut seat and the connecting block passes through the slotted hole and is connected to the rear table top.

[0013] Preferably, the drive mechanism further comprises a drive rod and a rotary converter located within the vertical rod, and the rotary converter comprises a first bevel gear and a second bevel gear meshing with each other. The motor is mounted on the outside of the vertical rod, and one end of the drive rod is in drive connection with the output end of the motor, while the other end projects into the vertical rod and is inserted into the first bevel gear, and one end of the threaded rod is inserted into the second bevel gear.

[0014] Preferably, a connecting plate is detachably mounted on the lower end face of the said rear table top, wherein the said connecting block passes through the said elongated hole and is connected to the said connecting plate.

[0015] Preferably, the said front tabletop comprises a horizontal plate and an inclined plate arranged at the front end of the said horizontal plate, the inclined plate being inclined from back to front and from top to bottom.

[0016] Preferably, the intermediate position of the front end of the aforementioned front tabletop is provided with a rearward-extending opening, the aforementioned opening being used to accommodate body parts of the user.

[0017] On the other hand, this invention offers a height-adjustable table comprising height-adjustable legs and the aforementioned adjustable tabletop construction, and the aforementioned adjustable tabletop construction is mounted on the aforementioned height-adjustable legs.

[0018] The present invention relates to an adjustable tabletop construction and a height-adjustable table, which offer at least the following advantageous effects: The design of the hinged front and rear tabletops, combined with the lower horizontal height of the front end of the table frame relative to the upper face of the table frame, ensures that the front tabletop tilts downwards simultaneously when the front and rear tabletops are moved forwards. Therefore, this tabletop construction is more convenient for users. The slight downward tilt of the front tabletop provides greater user comfort and facilitates access to the rear of the tabletop. Furthermore, the overall tabletop structure is simplified.To achieve the tilting of the front panel, the front and rear tabletops simply need to slide forward, eliminating the need for additional tilting mechanisms. This significantly reduces manufacturing costs and complexity. Even when the front tabletop tilts downwards, the front and rear tabletops always merge to form a single, continuous surface, making it more convenient to use. Explanations of characters

[0019] To illustrate the technical solutions in the embodiments of the present invention or in the prior art more clearly, the figures used in the embodiments or in the prior art are briefly presented. It is obvious that the figures described below represent only some embodiments of the present invention. Engineers in this field can obtain other figures without any creative effort based on the structures shown in such figures. Fig. 1 The three-dimensional view of the height-adjustable table of the present invention in the first state; Fig. 2 The side view of the height-adjustable table of the present invention in the first state; Fig. 3 The side view of the height-adjustable table of the present invention in the second state; Fig. 4 The three-dimensional view of the height-adjustable table of the present invention in the second state; Fig. 5 The schematic structural representation of the adjustable tabletop construction of the present invention; Fig. 6 The schematic structural representation of the adjustable tabletop construction of the present invention from a different perspective; Fig. 7 The schematic structural representation of the adjustable tabletop construction of the present invention after disassembly of the front and rear tabletops; Fig. 8 The schematic structural representation of the table frame of the present invention; Fig. 9 The schematic structural representation of the vertical rod of the present invention; Fig. 10 The schematic structural representation of the sliding bushing of the present invention; Fig. 11 The schematic assembly structure representation of the common part and the inclined bushing of the present invention; Fig. 12 The schematic structural representation of the common part of the present invention; Fig. 13 The schematic structural representation of the drive mechanism of the present invention; Fig. 14 The schematic internal structure representation of the rotary converter of the present invention;

[0020] In figures: 1- Table frame; 11- Vertical rod; 111- Horizontal section; 112- Inclined section; 113- Slotted hole; 12- Crossbeam; 13- Sliding part; 131- Main body; 132- Sliding block; 133- Second axle bore; 14- Inclined bushing; 15- Mounting section; 16- First axle bore; 2- Front table top; 21- Horizontal plate; 22- Inclined plate; 23- Clearance opening; 3- Rear table top; 4- Sliding bushing; 41- Slide rail; 5- Drive mechanism; 51- Motor; 52- Threaded rod; 53- Nut seat; 54- Connecting block; 55- Drive rod; 56- Rotary converter; 561- First bevel gear; 562- Second bevel gear; 6. Connecting plate; 7 height-adjustable legs

[0021] The achievement of the objectives, functional properties and advantages of the present invention are further explained in connection with the embodiments with reference to the accompanying figures. Detailed description of embodiments

[0022] The technical solutions of the embodiments of the present invention are now clearly and completely described with reference to the accompanying figures of the embodiments. It is obvious that the described embodiments represent only a subset of embodiments and not all embodiments of the present invention. Engineers in this field can, based on the embodiments of the present invention, obtain other embodiments within the scope of protection of the present invention without any creative effort.

[0023] It should be noted that if directional indicators (such as up, down, left, right, front, back, etc.) are present in the embodiments of this invention, these directional indicators serve solely to explain the relative positions and movements of respective components in a specific orientation (as shown in the figures). Should this specific orientation change, the directional indicators will change accordingly.

[0024] Furthermore, if descriptions such as "first-", "second-", etc., are present in the embodiments of this invention, such descriptions serve solely to illustrate the purpose and are not to be understood as indicating or suggesting a relative importance, nor as an implicit indication of the number of the specified technical properties. Consequently, properties designated as "first-", "second-", can explicitly or implicitly include at least one such property. Moreover, technical solutions from different embodiments can be combined, provided such combinations are feasible for engineers in this field. If a combination of technical solutions proves to be contradictory or impracticable, such a combination is deemed non-existent and does not fall within the scope of protection of the present invention.

[0025] Referring to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig. Figure 6 comprises an adjustable table structure consisting of a table frame 1, a front tabletop 2, and a rear tabletop 3. When using the table structure, the user is normally positioned at the front of the table structure, with the rear being the side opposite the user. Consequently, the front ends of the table frame 1, the front tabletop 2, and the rear tabletop 3 refer to the ends facing the user, while the rear ends refer to the ends facing away from the user. The rear tabletop 3 is mounted on the table frame 1 so that it can slide forwards and backwards, i.e., the rear tabletop 3 can move relative to the table frame 1. Moving it forwards brings it closer to the user, while moving it backwards moves it further away from the user.The front tabletop 2 is mounted on the front end of the table frame 1 so that it can slide forwards and backwards, and the rear end of the front tabletop 2 is hinged to the front end of the rear tabletop 3; in the conventional state of use, the front tabletop 2 and the rear tabletop 3 are connected from front to back and lie horizontally to form a complete tabletop. Hinge structures are described in detail (in ). Fig. (6 shown, not specified) are mounted on the lower end faces of the front tabletop 2 and the rear tabletop 3. The hinged side of the hinge structure is connected to the lower end face of the front tabletop 2, while the other side is connected to the lower end face of the rear tabletop 3. The front tabletop 2 and the rear tabletop 3 are connected, so the front tabletop 2 and the rear tabletop 3 move forward and backward synchronously. The forward and backward movement of the rear tabletop 3 drives the forward and backward movement of the front tabletop 2, or conversely, the forward and backward movement of the front tabletop 2 drives the forward and backward movement of the rear tabletop 3.The driving force for the forward and backward movement of the front tabletop 2 and the rear tabletop 3 can be exerted either by the user or by a power mechanism. The horizontal height of the front end of the table frame 1 is lower than that of the upper end face of the table frame 1, thus the front tabletop 2 tilts downwards at a certain angle during forward movement. The first state of the height-adjustable table, as shown in the... Fig. 1 and Fig. Figure 2 shows a normal state in which the front tabletop 2 and the rear tabletop 3 are located at the rear end of the table frame. The second state of the height-adjustable table, as shown in the Fig. 3 and Fig. Figure 4 shows the position after the front tabletop 2 and the rear tabletop 3 have moved forward. As shown in Fig. As shown in Figure 3, the front tabletop 2 not only moves forward but also tilts downwards at an angle. The downward tilt angle of the front tabletop 2 is between 5° and 15°. It must be ensured that the front tabletop 2 remains tilted downwards while simultaneously preventing objects placed on it from sliding off, which would otherwise prevent objects from being placed on the front tabletop.

[0026] The technical solution comprises a front tabletop 2 and a rear tabletop 3, hinged together. The horizontal height of the front end of the table frame 1 is lower than that of the upper end of the table frame 1. This allows the front tabletop 2 to tilt downwards simultaneously when both the front tabletop 2 and the rear tabletop 3 are moved forwards, thus making the table more user-friendly. The slightly downward-sloping front tabletop 2 provides a more comfortable user experience and also facilitates access to the area of ​​the rear tabletop 3. Furthermore, the overall structure of the table is simplified.To achieve the tilt of the front tabletop 2, it is only necessary to move the front tabletop 2 and the rear tabletop 3 forward, thus eliminating the need for additional mechanisms to tilt the front tabletop 2 and significantly reducing manufacturing costs and complexity. Even when the front tabletop 2 tilts downwards, it always forms a continuous tabletop surface with the rear tabletop 3, which is more convenient for users.

[0027] Referring to the Fig. 7 and Fig. The table frame 1 comprises vertical rods 11, the longitudinal direction of which corresponds to the direction of the forward and backward movement of the front tabletop 2 and the rear tabletop 3. The horizontal height of the front end of the vertical rods 11 is lower than that of the upper end face of the vertical rods 11. The rear tabletop 3 is attached to the vertical rods 11 so as to be slid forward and backward, while the front tabletop 2 is attached to the rear ends of the vertical rods 11 so as to be slid forward and backward. The table frame 1 further comprises a crossbeam 12, both ends of which are provided with vertical rods 11. Consequently, two vertical rods 11 are arranged, with two vertical rods 11 located on either side of the lower ends of the front tabletop 2 and the rear tabletop 3.The rear tabletop 3 is slidably attached to the two vertical bars 11, while the front tabletop 2 is slidably attached to the front ends of the two vertical bars 11. The crossbeam 12 is perpendicular to the vertical bars 11, and the two vertical bars 11 are parallel to each other. The table frame 1 has a simple structure, with the shapes of the vertical bars 11 designed to allow the front tabletop 2 to tilt downwards during forward movement.

[0028] Referring to the Fig. Figure 9 comprises a vertical rod 11, a horizontal section 111, and an inclined section 112. The rear end of the inclined section 112 is connected to the front end of the horizontal section 111, with the inclined section 112 tilting from back to front and from top to bottom. Therefore, the horizontal height at the front end of the vertical rod 11 is lower than that at the upper end face of the vertical rod 11. Referring to the Fig. 7 A sliding part 13 is attached to the front end of the inclined section 112, and the sliding part 13 can rotate forwards and backwards relative to the inclined section 112. Referring to the Fig. 6, Fig. 7 and Fig. 10 A sliding bushing 4 is attached to the underside of the front tabletop 2. The sliding bushing 4 is provided with a sliding rail 41, and the longitudinal direction of the sliding rail 41 is the same as the forward and backward direction of movement of the front tabletop 2. The sliding element 13 is arranged to slide within the sliding rail 41. A vertical rod 11 consists of a horizontal section 111 and an inclined section 112. It has a simple structure and is also easy to manufacture. The arrangement of the sliding element 13 and the sliding bushing 4 improves the smoothness of the forward and backward movement of the front tabletop 2, prevents deviation during forward movement and tilting of the front tabletop 2, and also increases the structural stability.

[0029] Referring to the Fig. 10 The sliding bushing 4 has a hollow interior and is provided with a sliding rail 41 on its lower end face. The height of the sliding bushing 4 gradually decreases from front to back. Referring to the Fig. The sliding element 13 comprises a main body 131 and a sliding block 132. The main body 131 is rotatably mounted at the front end of the inclined section 112, while the sliding block 132 is detachably mounted to the main body 131 and lies within the sliding bushing 4. During assembly, the main body 131 is first mounted at the front end of the inclined section 112 of the vertical rod 11. The sliding block 132 is then placed into the sliding bushing 4. The main body 131 is then inserted into the sliding bushing 4 from the outside through the sliding rail 41. The sliding bushing 4 and the main body 131 are then connected to each other; finally, the sliding bushing 4 is mounted on the lower end face of the tabletop. The sliding element 13 has a simple structure that ensures smooth movement of the front tabletop 2 and simultaneously facilitates the assembly of the entire structure.Furthermore, the structure of the sliding bushing 4 allows the sliding block 132 to be inserted into the sliding bushing 4, provided that the front tabletop moves forward and tilts to ensure structural stability.

[0030] Referring to the Fig. 8 and Fig. In this embodiment, the inclined bushing 14 is mounted on the inclined section 112, and the sliding element 13 is installed at the front end of the inclined bushing 14. The horizontal section 111 and the inclined section 112 form a single structure that constitutes a vertical rod 11. To ensure structural strength, the vertical rod 11 is typically made of metal. Attaching the sliding element 13 directly to the front end of the inclined section 112 results in a more complex structure for the vertical rod 11 and higher manufacturing costs. In this embodiment, the inclined bushing 14 is mounted on the inclined section 112, while the sliding element 13 is installed at the front end of the inclined bushing 14. This facilitates subsequent maintenance or replacement of this structure without requiring repair or replacement of the entire vertical rod 11, thereby reducing future maintenance costs.

[0031] Referring to the Fig. 11. The mounting section 15 is mounted at the front end of the inclined bushing 14. This mounting section 15 has a hollow interior and is provided with first axle bores 16 on both sides; Referring to the Fig. In section 12, the lower end of the aforementioned sliding part 13 is provided with a second axial bore 133, and the lower end of the sliding part 13 lies in the hollow space of the mounting section 15. At this point, the first two axial bores 16 and the second axial bore 133 are connected through each other. A pin (not shown in the figure) passes through the first axial bores 16 and the second axial bore 133 so that the sliding part 13 can be rotatably mounted on the mounting section 15. This design facilitates the assembly and disassembly of the sliding part 13 and offers a simple structure and quick assembly.

[0032] Referring to the Fig. 6. The adjustable table construction further comprises a drive mechanism 5, which can be mounted on the table frame 1 or alternatively at another location on the table, provided that it can be ensured that the drive mechanism 5 drives the front tabletop 2 and the rear tabletop 3 to move synchronously forwards and backwards. For example, the output end of the drive mechanism 5 is connected to the rear tabletop 3 to drive the rear tabletop 3 forwards and backwards and to drive the front tabletop 2 forwards and backwards synchronously; alternatively, the output end of the drive mechanism 5 can be connected to the front tabletop 2 to drive the front tabletop 2 forwards and backwards and to drive the rear tabletop 3 forwards and backwards synchronously.The drive mechanism 5 enables automatic control of the forward and backward movement of both the front tabletop 2 and the rear tabletop 3; A single drive mechanism 5 performs two functions: namely the translation of the front tabletop 2 and the rear tabletop 3 and the tilting of the front tabletop 2.

[0033] Referring to the Fig. The drive mechanism 5 comprises a motor 51, a threaded rod 52, and a nut 53, wherein the motor 51 is mounted on the vertical rod 11 and the threaded rod 52 is in drive connection with the output end of the motor 51, its longitudinal direction being the same as the forward-backward direction of movement of the rear tabletop 3. The nut 53 is in threaded drive connection with the threaded rod 52 and is connected to the lower end face of the rear tabletop 3. The motor 51 serves as the power output mechanism, with users being able to start and stop the motor 51 via a control panel or similar device. When the motor 51 is operating, the output end drives the threaded rod 52 to rotate. The rotation of the threaded rod 52 drives the nut 53 to move along the longitudinal direction of the threaded rod 52.As the mother seat 53 shifts, it drives the rear tabletop 3 to move synchronously forwards and backwards. The simple structure of the drive mechanism 5 facilitates power control of the forwards and backwards movement of the rear tabletop 3.

[0034] The threaded rod 52 lies entirely within the vertical rod 11, with its longitudinal direction being the same as the longitudinal direction of the vertical rod. The threaded rod 52 can rotate about its central axis within the vertical rod 11. The upper end face of the vertical rod 11 is provided with an elongated slot 113, with the longitudinal direction of the elongated slot 113 being the same as the longitudinal direction of the threaded rod 52. A connecting block 54 is mounted on the nut seat 53, and the connecting block 54 extends through the elongated slot 113 and is connected to the rear table plate 3. The connecting block 54 can slide freely within the elongated slot 113. Due to the arrangement of the threaded rod 52 within the vertical rod 11, both the threaded rod 52 and the nut seat 53 are concealed.This prevents external factors from influencing the rotation of the threaded rod 52 or the displacement of the nut seat 53, and simultaneously avoids potential user injuries during rotation of the threaded rod 52. The arrangement of the elongated hole 113 and the connecting block 54 allows for the connection between the connecting block 54 and the rear tabletop 3, simplifying the overall structure. Furthermore, the longitudinal orientation of the elongated hole 113 limits the forward and backward movement of the connecting block 54, ensuring that the forward and backward displacement of the front tabletop 2 and the rear tabletop 3 remains within a controllable range.

[0035] Referring to the Fig. 6 and Fig. 7 A connecting plate 6 is detachably mounted on the lower end face of the rear tabletop 3, with the connecting block 54 passing through the elongated hole 113 and being connected to the connecting plate 6. The connecting plate 6 has a recess in its center, in which holes are drilled. Corresponding threaded holes are drilled in the connecting block 54. Screws are inserted through the holes in the recess of the connecting plate 6 and screwed into the threaded holes in the connecting block 54 to connect the connecting block 54 and the connecting plate 6. Additionally, holes are drilled on both sides of the connecting plate 6 so that the connecting plate 6 can be screwed to the lower end face of the rear tabletop 3. The arrangement of a connecting plate 6 facilitates the connection between the rear tabletop 3 and the connecting block 54.

[0036] Referring to the Fig. 13 and Fig. 14 The drive mechanism 5 further comprises a drive rod 55 and a rotary converter 56 located inside the vertical rod 11. The rotary converter 56 comprises a first bevel gear 561 and a second bevel gear 562 meshing with each other. The motor 51 is located at the rear end of the vertical rod 11 and is mounted on the outside of the vertical rod 11 by means of an L-shaped connecting plate (not shown in the figures). One end of the drive rod 55 is in drive connection with the output end of the motor 51, and bores are provided on the side of the vertical rod 11 facing the motor 51. The other end of the drive rod 55 passes through bores into the vertical rod 11 and projects into the rotary converter 56, and the first bevel gear 561 inside the rotary converter 56 is fitted onto the other end of the drive rod 55.

[0037] One end of the threaded rod 52 is inserted into the rotary converter 56. The second bevel gear 562, located within the rotary converter 56, is fitted onto one end of the threaded rod 52. The threaded rod 52 is perpendicular to the drive rod 55. When the motor 51 is operating, its output drive sets the drive rod 55 in motion, causing the first bevel gear 561 to rotate synchronously. The first bevel gear 561 and the second bevel gear 562 engage, causing the second bevel gear 562 to rotate with the first bevel gear 561, and the second bevel gear 562 to drive the threaded rod 52 synchronously. The rotation of the threaded rod 52 causes the nut seat 53 to move, and subsequently the rear table plate 3 to move forward and backward. The motor 51 is located outside the vertical rod 11, which simplifies cable and control connections as well as maintenance.The arrangement of the drive rod 55 and the rotary converter 56 enables the transmission of the rotary motion between the drive rod 55 and the threaded rod 52, so that the driving force of the external motor 51 is transmitted stably from the vertical rod 11 to the threaded rod 52 inside the vertical rod 11.

[0038] In this embodiment, two sets of drive mechanisms 5 are provided, each set being arranged on one of the two vertical rods 11. These two sets of drive mechanisms 5 operate synchronously to perform rapid movement of the front tabletop 2 and the rear tabletop 3. Of course, in other embodiments, a single set of drive mechanisms 5 can be arranged to implement electrical control.

[0039] Referring to the Fig. Figure 5 comprises the front tabletop 2, a horizontal plate 21, and a slanted plate 22. The rear end of the slanted plate 22 is connected to the front end of the horizontal plate 21, with the slanted plate 22 curving and tilting from back to front and top to bottom. The slanted plate 22 allows the front end of the front tabletop 2 to curve downwards in an arc, facilitating comfortable adjustment to the user's hands and increasing comfort. As the front tabletop 2 moves forward and tilts downwards, the curved slanted plate 22 makes the entire tabletop flatter and more seamless.

[0040] Referring to the Fig. 5 is the intermediate position of the front end of the front tabletop 2, which is provided with a rearward-extending clearance opening 23. This clearance opening serves to accommodate parts of the user's body. By providing this clearance opening 23, the user can position their body within it when using the tabletop assembly. This facilitates access to objects on the rear tabletop 3 and thus increases the utilization rate of the rear tabletop 3. Furthermore, the sloping panels 22 on the left and right sides of the clearance opening 23 offer improved adaptive support for both hands, thereby increasing comfort.

[0041] Referring to the Fig. 1, Fig. 2, Fig. 3 to Fig.4. A height-adjustable table comprises height-adjustable legs 7 and an adjustable tabletop assembly mounted on these legs 7. When adjusted, the legs 7 drive the entire adjustable tabletop assembly to raise and lower it. The legs 7 can be standard two- or three-section adjustable legs, the detailed structure of which is not described here. The height-adjustable table utilizes the aforementioned adjustable tabletop assembly and thus benefits from its advantages. In combination with the adjustable legs 7, the entire table offers multiple practical advantages.

[0042] The adjustable tabletop construction can also be integrated into conventional table legs or support frames to form a conventionally functioning table.

[0043] The above-mentioned presentation merely represents preferred embodiments of this invention and does not limit the scope of the claims of this invention.

Claims

[1] Adjustable tabletop construction, characterized by , that it comprises a table frame (1), a front tabletop (2) and a rear tabletop (3), wherein the said rear tabletop (3) is mounted on the said table frame (1) so as to be slid forwards and backwards, and wherein the rear end of the said front tabletop (2) is hinged to the front end of the said rear tabletop (3), and wherein the said front tabletop (2) is mounted on the front end of the said table frame (1) and can slide forwards and backwards synchronously with the said rear tabletop (3); and that the horizontal height of the front end of the said table frame (1) becomes lower than that of the upper end face of the said table frame (1) so that the said front table top (2) tilts downwards when moving forwards. [2] Adjustable tabletop construction according to claim 1, characterized by, that the said table frame (1) comprises a vertical pole (11), wherein the horizontal height of the front end of the said vertical pole (11) is lower than that of the upper end face of the said vertical pole (11), and wherein the said rear tabletop (3) is mounted so as to be slid forwards and backwards on the said vertical pole (11), while the said front tabletop (2) is mounted so as to be slid forwards and backwards on the front end of the said vertical pole (11). [3] Adjustable table construction according to claim 2, characterized by , that the said vertical rod (11) comprises a horizontal section (111) and an inclined section (112), wherein the rear end of the said inclined section (112) is connected to the front end of the said horizontal section (111) and the said inclined section (112) inclines from back to front and from top to bottom; and that a rotatable sliding part (13) is mounted at the front end of the said inclined section (112) and a sliding bushing (4) is mounted on the underside of the said rear table top (3), wherein the said sliding bushing (4) is provided with a sliding rail (41) and the said sliding part (13) is inserted slidably into the said sliding rail (41). [4] Adjustable tabletop construction according to claim 3, characterized by , that the said sliding bushing (4) has a hollow interior, wherein the said sliding rail (41) lies on the lower end face of the said sliding bushing (4) and the height of the said sliding bushing (4) gradually decreases from front to back, and that the said sliding part (13) comprises a main body (131) rotatably mounted on the front end of the said inclined section (112) and a sliding block (132) detachably mounted on the upper end of the said main body (131), wherein the said sliding block (132) is located within the said sliding bushing (4). [5] Adjustable tabletop construction according to claim 3, characterized by , that an inclined bushing (14) is mounted on the said inclined section (112), wherein the said sliding part (13) is mounted at the front end of the said inclined bushing (14). [6] Adjustable tabletop construction according to claim 5, characterized by , that the front end of the aforementioned inclined bushing (14) is provided with a mounting section (15), and that the mounting section (15) has a hollow interior and is provided on both sides with first axle bores (16); and that the lower end of the said sliding part (13) is provided with a second axis bore (133) and the lower end of the said sliding part (13) lies in the hollow space of the said mounting section (15), wherein a pin passes through the said first axis bore (16) and the said second axis bore (133) in order to rotatably mount the said sliding part (13) on the said mounting section (15). [7] Adjustable tabletop construction according to claim 2, characterized by , that it further comprises a drive mechanism (5), wherein said drive mechanism (5) serves to cause said front table top (2) and said rear table top (3) to move synchronously forwards and backwards. [8] Adjustable tabletop construction according to claim 7, characterized by, that the said drive mechanism (5) comprises a motor (51), a threaded rod (52) and a center seat (53), wherein the said motor (51) is mounted on the said vertical rod (11) and the said threaded rod (52) is in drive connection with the output end of the said motor (51), and wherein the said nut seat (53) is in thread drive connection with the said threaded rod (52) and is connected to the underside of the said rear table top (3). [9] Adjustable tabletop construction according to claim 8, characterized by, that the said threaded rod (52) lies within the said vertical rod (11) and the upper end face of the said vertical rod (11) is provided with an elongated hole (113), wherein a connecting block (54) is mounted on the said nut seat (53) and the said connecting block (54) passes through the said elongated hole (113) and is connected to the said rear table top (3). [10] Adjustable tabletop construction according to claim 9, characterized by , that the said drive mechanism (5) further comprises a drive rod (55) and a rotary converter (56) located within the said vertical rod (11), wherein the said rotary converter (56) comprises a first bevel gear (561) and a second bevel gear (562) engaging with each other, and that the said motor (51) is mounted on the outside of the said vertical rod (11), and wherein one end of the said drive rod (55) is in drive connection with the output end of the said motor (51), while the other end projects into the said vertical rod (11) and is inserted into the said first bevel gear (561), and wherein one end of the said threaded rod (52) is inserted into the said second bevel gear (562). [11] Adjustable tabletop construction according to claim 9, characterized by , that a connecting plate (6) is detachably mounted on the lower end face of the said rear table top (3), wherein the said connecting block (54) passes through the said elongated hole (113) and is connected to the said connecting plate (6). [12] Adjustable tabletop construction according to claim 1, characterized by, that the said front tabletop (2) comprises a horizontal plate (21) and an inclined plate (22) arranged at the front end of the said horizontal plate (21), wherein the said inclined plate (22) curves and slopes from back to front and from top to bottom. [13] Adjustable tabletop construction according to claim 1 or 12, characterized by , that the intermediate position of the front end of the said front table top (2) is provided with a rearward extending free space opening (23), the said free space opening (23) serving to accommodate body parts of the user. [14] Height-adjustable table, characterized by , that it comprises height-adjustable legs (7) and said adjustable tabletop construction according to one of claims 1 to 13, wherein said adjustable tabletop construction is mounted on said height-adjustable legs (7).

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