Synchronous pulling, lifting and expanding table

Abstract

The utility model provides a synchronous drawing lifting expansion table which comprises a table plate structure, a middle table top lifting assembly and a synchronous drawing structure, the table plate structure comprises a middle table plate and two side table plates arranged on the two sides of the middle table plate, and the two side table plates are arranged on the two sides of the middle table plate in a sliding mode. The middle table plate lifting assembly is driven by the synchronous drawing structure to achieve lifting of the middle table plate. The synchronous drawing structure comprises a rotating base and two swing arms, one ends of the two swing arms are rotatably arranged on the rotating base, the middle table plate is arranged on the rotating base, the other ends of the two swing arms are rotatably connected with the corresponding side table plates, the swing arms are pulled to extend towards the two sides, and then the rotating base is driven to rotate; when the middle table board is switched between the unfolded state and the folded state, the middle table board ascends and descends synchronously, operation is convenient, and the problems that in the prior art, due to the fact that the middle table board of a drawing expansion table is lifted manually, stability is poor, deformation operation is inconvenient, and price is high are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture structure design, in particular to a synchronously drawable lifting expansion table. Background Art

[0002] As one of the most common furniture, tables have been accompanying people's daily lives for thousands of years. In order to meet the needs of the public, the types of tables are also constantly evolving. Currently, the tables on the market can be divided into many categories according to needs, such as office desks, dining tables, desks, computer desks, and desks, etc.

[0003] Similarly, tables can also be divided into pull-out tables and folding tables according to their structure. Since the pull-out expansion table has two forms, expansion and storage, it can be applied to more usage scenarios, so more and more families choose it. However, the existing pull-out expansion tables generally have slide rails to achieve semi-automatic pull-out, and the middle table board is generally lifted manually. This kind of lifting expansion table has poor stability, inconvenient deformation operation, and is expensive, has many accessories, and a complicated production process. Utility Model Content

[0004] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a synchronous pull-out and liftable expansion table to solve the problems of poor stability, inconvenient deformation and high price caused by manual lifting of the middle table top of the pull-out expansion table in the prior art.

[0005] In order to solve the above technical problems, the utility model provides a synchronous pull-out lifting expansion table, comprising:

[0006] A table board structure, the table board structure includes a middle table board and two side table boards arranged on both sides of the middle table board, the two side table boards are slidingly arranged, and is characterized in that it also includes a middle table top lifting component and a synchronous pulling structure, and the middle table board lifting component realizes the lifting of the middle table board under the drive of the synchronous pulling structure;

[0007] The synchronous pulling structure includes a rotating base, two swing arms with one end rotatably arranged on the rotating base, the middle table plate is arranged on the rotating base, and the other ends of the two swing arms are rotatably connected to the corresponding side table plates, and the swing arms are pulled to extend toward both sides, thereby driving the rotating base to rotate;

[0008] Pull the two side table panels toward both sides of the center table panel, and the side table panels slide toward both sides of the center table panel, and the rotating base rotates under the pulling of the two swing arms. When the distance between the two side table panels just accommodates the center table panel, the center table panel lifting assembly pushes the center table panel out and makes it flush with the side table panels on both sides, and the synchronous pull-out and liftable expansion table is in the expanded state; then push the two side table panels inward to drive the rotating base to rotate, and the center table panel lifting assembly drives the center table panel down to the storage position, and the two side table panels continue to approach each other until they abut against each other and store the center table panel under the side table panels, and the synchronous pull-out and liftable expansion table is in the storage state.

[0009] As a more preferred embodiment, the center table board lifting assembly includes a wedge-shaped piece arranged at the bottom of the center table board and a lifting piece arranged on a rotating base. The lifting piece rotates to the lower side of the wedge-shaped piece to lift up the center table board. When the lifting piece is disengaged from the wedge-shaped piece, the center table board descends.

[0010] As a more preferred embodiment, the synchronously pull-out and liftable expansion table also includes a frame structure, the two side table panels are slidably arranged on the frame structure, and the middle table panel is located in the middle of the frame structure.

[0011] As a more preferred manner, a central crossbeam is provided on the frame structure, and the rotating base is fixed on the central crossbeam.

[0012] As a more preferred embodiment, the rotating base includes a rotating shaft, a connecting rod and an ejector rod, the middle parts of the connecting rod and the ejector rod are fixed to each other and rotatably arranged on the rotating shaft, the two ends of the connecting rod are respectively hinged to the two swing arms, and the ejecting member is arranged on the ejector rod.

[0013] As a more preferred embodiment, a plurality of evenly distributed wedge-shaped pieces are provided on the middle table top, and a plurality of lifting pieces corresponding to the wedge-shaped pieces are provided on the rotating base. Thus, when a plurality of the wedge-shaped pieces are in contact with the corresponding lifting pieces at the same time, the lifting process of the middle table top can be smoother and easier to keep horizontal.

[0014] As a more preferred embodiment, the wedge-shaped member includes a wedge-shaped surface and a horizontal plane connected to the wedge-shaped surface. When the lifting member slides along the wedge-shaped surface to the horizontal plane, the center table top is lifted up. The wedge-shaped surface and the horizontal plane arranged on the wedge-shaped member can conveniently meet the sliding requirements of the lifting member.

[0015] As a more preferred method, the lifting member adopts a roller, so that when the lifting member slides along the wedge surface and the horizontal surface, the friction force is smaller and the structure is smoother.

[0016] As a more preferred embodiment, the two side table panels are of the same size and are symmetrically arranged with respect to the middle table panel. This makes the structure more beautiful and the state switching of the synchronously pull-out and liftable expansion table smoother.

[0017] As a more preferred manner, when the synchronously pull-out lifting expansion table is in an unfolded state, the two swing arms are located in the same straight line, and the synchronously pull-out structure is self-locking.

[0018] As a more preferred manner, the synchronous pull-out, lift-able expansion table also includes an unlocking structure. When the synchronous pull-out structure is self-locked, the unlocking structure is utilized to drive the rotating base to rotate and thereby unlock the synchronous pull-out structure. In this way, when the synchronous pull-out structure is self-locked, the synchronous pull-out, lift-able expansion table can remain stable in the expanded state, and is more stable and safe in use. At the same time, the unlocking structure also satisfies the requirement that the synchronous pull-out, lift-able expansion table can be conveniently switched from the expanded state to the stored state.

[0019] As described above, the synchronous pull-out lifting expansion table of the utility model has the following beneficial effects: when in use, the synchronous pull-out lifting expansion table of the utility model can be switched between the unfolded state and the stowed state according to the usage scenario, specifically:

[0020] In a scenario where multiple people use the table, such as a dinner party, the two side table panels are pulled toward the sides of the center table panel, and the side table panels slide toward the sides of the center table panel. The rotating base rotates under the pull of the two swing arms. When the distance between the two side table panels just accommodates the center table panel, the center table panel lifting assembly pushes the center table panel out and flushes it with the side table panels on both sides. The synchronously pull-out lifting expansion table is in an unfolded state. At this time, the area of ​​the table panel structure is expanded, which is very suitable for use by multiple people.

[0021] For example, in a scenario where a small number of people use the table in daily life, the two side table panels can be pushed inward to drive the rotating base to rotate, and the middle table panel lifting assembly drives the middle table panel to descend, and the two side table panels continue to approach each other until they abut against each other and the middle table panel is stored under the side table panels. The synchronously pull-out lifting expansion table is in a stored state, at which time the area of ​​the table panel structure is reduced, and the floor space occupied by the synchronously pull-out lifting expansion table is reduced, which meets daily use while reducing the placement space;

[0022] When the synchronous pull-out and liftable expansion table of the utility model is switched between the unfolded state and the stowed state, it is only necessary to control the pulling out of the side table panels, and the lifting and lowering of the middle table panel is automatically completed by the swing arm driving the rotating base to rotate. Compared with the structure of the traditional pull-out table in which the middle table panel is manually lifted, the deformation operation is simple and convenient, the stability is good, and the structure is simple and the cost is lower.

[0023] To sum up, the synchronous pull-out and liftable expansion table of the utility model adopts a synchronous pull-out structure, so that when switching between the unfolded state and the stored state, the side table panels are pulled out, and the middle table panel is synchronously lifted and lowered, which is convenient for operation and has a more stable structure. It solves the problems of poor stability, inconvenient deformation and high price caused by manual lifting of the middle table panel of the pull-out expansion table in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure shows the unfolded state of the synchronously pull-out lifting expansion table of the present invention;

[0025] Figure 2 Display as Figure 1 A partial enlarged view of the middle area A;

[0026] Figure 3 The figure shows the storage state of the synchronously pull-out lifting expansion table of the present invention;

[0027] Figure 4 Shown is a schematic diagram of the middle table top of the synchronously pull-out and liftable expansion table of the present invention.

[0028] Component number description

[0029] 1 Table structure

[0030] 11 Middle table

[0031] 111 Circular Track

[0032] 112 Limiting column

[0033] 113 Wedge

[0034] 113a Wedge-shaped surface

[0035] 113b Horizontal plane

[0036] 12 Side table

[0037] 2 Synchronous pull-out structure

[0038] 21. Rotating base

[0039] 211 Shaft

[0040] 212 Connecting rod

[0041] 213 Ejector rod

[0042] 22 Swing arm

[0043] 23 Lifting piece

[0044] 3 Framework structure

[0045] 31 Front crossbeam

[0046] 32 Rear crossbeam

[0047] 33 Sidebar

[0048] 331 Slide Rail

[0049] 332 Limit hole

[0050] 34 Center beam

[0051] 4 Unlocking structure

[0052] 41 Pull-out rod

[0053] 42 Release lever

[0054] 43 Rotating handle

[0055] 5 Legs DETAILED DESCRIPTION

[0056] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0057] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that can be produced by the utility model and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is limited only by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit this application. Spatial related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., can be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "hold" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0060] like Figures 1 to 4 As shown, the utility model provides a synchronously pull-out lifting expansion table, comprising:

[0061] A table board structure 1, the table board structure 1 comprises a middle table board 11 and two side table boards 12 arranged on both sides of the middle table board 11, the two side table boards 12 are slidably arranged, and a wedge-shaped piece 113 is arranged at the bottom of the middle table board 11;

[0062] A synchronous pulling structure 2, the synchronous pulling structure 2 comprises a rotating base 21, two swing arms 22 with one end symmetrically hinged to the rotating base 21, the middle table board 11 is arranged on the rotating base 21, the other ends of the two swing arms 22 are hinged to the corresponding side table boards 12, and a lifting piece 23 adapted to the wedge-shaped piece 113 is arranged on the rotating base 21, the swing arms 22 are pulled to extend toward both sides, thereby driving the rotating base 21 to rotate, and the lifting piece 23 is rotated to the lower side of the wedge-shaped piece 113 to lift up the middle table board 11;

[0063] The two side table panels 12 are pulled toward both sides of the center table panel 11, and the side table panels 12 slide toward both sides of the center table panel 11, and the rotating base 21 rotates under the pull of the two swing arms 22. When the distance between the two side table panels 12 just accommodates the center table panel 11, the lifting piece 23 rotates to the lower side of the wedge-shaped piece 113 to push the center table panel 11 out and make it flush with the side table panels 12 on both sides, and the synchronous pull-out and lift expansion table is in the expanded state; then the two side table panels 12 are pushed inward to drive the rotating base 21 to rotate, and the lifting piece 23 is disengaged from the wedge-shaped piece 113, and the center table panel 11 descends. The two side table panels 12 continue to approach each other until they abut against each other and store the center table panel 11 under the side table panels 12, and the synchronous pull-out and lift expansion table is in the stored state.

[0064] In order to better introduce the utility model, the following specific applications are now used to illustrate: When the synchronous pull-out lifting expansion table of the utility model is used, it can be switched between the unfolded state and the stored state according to the usage scenario, specifically:

[0065] In a scenario where multiple people use the table, such as a dinner party, the two side table panels 12 are pulled toward the sides of the center table panel 11, and the side table panels 12 slide toward the sides of the center table panel 11. The rotating base 21 rotates under the pull of the two swing arms 22. When the distance between the two side table panels 12 just accommodates the center table panel 11, the lifting member 23 rotates to the lower side of the wedge-shaped member 113 to push out the center table panel 11 and align it with the side table panels 12 on both sides. The synchronously pull-out lifting expansion table is in an unfolded state. At this time, the area of ​​the table panel structure 1 is expanded, which is very suitable for use by multiple people.

[0066] For example, in a scenario where a small number of people use the table in daily life, the two side table panels 12 can be pushed inward to drive the rotating base 21 to rotate, the lifting member 23 is disengaged from the wedge-shaped member 113, the middle table panel 11 descends, and the two side table panels 12 continue to approach each other until they abut against each other and the middle table panel 11 is stored under the side table panels 12. The synchronously pull-out lifting expansion table is in a stored state. At this time, the area of ​​the table panel structure 1 is reduced, and the area occupied by the synchronously pull-out lifting expansion table is reduced, which meets daily use while reducing the placement space;

[0067] When the synchronous pull-out and liftable expansion table of the utility model is switched between the unfolded state and the stowed state, it is only necessary to control the pulling and pulling of the side table panels 12. The lifting and lowering of the middle table panel 11 is automatically completed by the swing arm 22 driving the rotating base 21 to rotate. Compared with the structure of the traditional pull-out table in which the middle table panel 11 is manually lifted, the deformation operation is simple and convenient, the stability is good, and the structure is simple and the cost is lower.

[0068] In this embodiment, if Figure 1 , Figure 2 as well as Figure 3 As shown, the synchronously pull-out lifting expansion table also includes a frame structure 3, the two side table panels 12 are slidably arranged on the frame structure 3, and the middle table panel 11 is located in the middle of the frame structure 3; further, in this embodiment, the frame structure 3 is a rectangular frame structure 3, which is surrounded by a front crossbeam 31, a rear crossbeam 32 and two side rods 33, and the side rods 33 are provided with slide rails 331, and the two ends of the side table panels 12 are arranged in the slide rails 331; in this embodiment, the synchronously pull-out lifting expansion table also includes four legs 5, and the four legs 5 are respectively arranged at the four corners of the frame structure 3. Further, in this embodiment, the bottom of the middle table panel 11 is provided with an annular track 111 for the lifting member 23 to slide, and the wedge member 113 is arranged on the annular track 111.

[0069] Furthermore, in this embodiment, if Figure 1 , Figure 2 as well as Figure 3 As shown, a limiting column 112 is also provided at the bottom of the center table board 11, and the limiting column 112 is vertically fixed on the center table board 11. The side rod 33 is provided with a limiting hole 332 that is compatible with the limiting column 112. The limiting column 112 is inserted into the limiting hole 332. In this way, when the center table board 11 is ejected or lowered, the cooperation of the limiting hole 332 and the limiting column 112 can ensure that the center table board 11 moves stably in the vertical direction without deviation; further, in this embodiment, a plurality of limiting columns 112 are provided at the bottom of the center table board 11, and the limiting column 112 is arranged near the edge of the center table board 11, and a plurality of limiting holes 332 are correspondingly provided on the side rod 33, which can further ensure that the center table board 11 can move smoothly when it is ejected or lowered.

[0070] In this embodiment, if Figure 1 , Figure 2 as well as Figure 3 As shown, a central cross beam 34 is provided on the frame structure 3 . The central cross beam 34 is provided in the middle of the frame structure 3 and is flush with the front cross beam 31 and the rear cross beam 32 . The rotating base 21 is fixed on the central cross beam 34 .

[0071] In this embodiment, if Figure 1 , Figure 2 as well as Figure 3 As shown, the rotating base 21 includes a rotating shaft 211, a connecting rod 212 and an ejector rod 213. The middle parts of the connecting rod 212 and the ejector rod 213 are fixed to each other and rotatably arranged on the rotating shaft 211. The two ends of the connecting rod 212 are respectively hinged to the two swing arms 22, and the ejector 23 is arranged on the ejector rod 213.

[0072] In this embodiment, if Figure 4 As shown, the center table top 11 is provided with a plurality of evenly distributed wedge-shaped pieces 113, and the rotating base 21 is provided with a plurality of lifting pieces 23 corresponding to the wedge-shaped pieces 113, so that when the plurality of wedge-shaped pieces 113 are in contact with the corresponding lifting pieces 23 at the same time, the lifting process of the center table top 11 can be smoother and easier to keep horizontal.

[0073] In this embodiment, if Figure 4As shown, the wedge-shaped member 113 includes a wedge-shaped surface 113a and a horizontal surface 113b connected to the wedge-shaped surface 113a. When the lifting member 23 slides along the wedge-shaped surface 113a to the horizontal surface 113b, the center table top 11 is lifted up, and the wedge-shaped surface 113a and the horizontal surface 113b provided on the wedge-shaped member 113 can conveniently meet the sliding of the lifting member 23.

[0074] In this embodiment, if Figure 1 , Figure 2 as well as Figure 3 As shown, the lifting member 23 adopts a roller, so when the lifting member 23 slides along the wedge surface 113a and the horizontal surface 113b, the friction force is smaller and the structure is smoother; further, in this embodiment, two wedge members 113 are symmetrically arranged on the circular track 111 of the center table board 11, and the two ends of the ejection rod 213 are provided with lifting members 23 adapted to the wedge members 113.

[0075] In this embodiment, if Figure 1 , Figure 2 as well as Figure 3 As shown, the two side table panels 12 are of the same size and are symmetrically arranged with respect to the middle table panel 11. Such a structure is more beautiful and the state switching of the synchronously pull-out and liftable expansion table is smoother.

[0076] In this embodiment, if Figure 1 , Figure 2 as well as Figure 3 As shown, when the synchronous pull-out lifting expansion table is in the unfolded state, the two swing arms 22 are located on the same straight line, and the synchronous pull-out structure 2 is self-locking.

[0077] In this embodiment, if Figure 1 , Figure 2 as well as Figure 3 As shown, the synchronous pull-out and liftable expansion table also includes an unlocking structure 4. When the synchronous pull-out structure 2 is self-locked, the unlocking structure 4 is used to drive the rotating base 21 to rotate and then unlock the synchronous pull-out structure 2. In this way, when the synchronous pull-out structure 2 is self-locked, the synchronous pull-out and liftable expansion table can remain stable in the expanded state, and is more stable and safe in use; at the same time, the unlocking structure 4 also satisfies the synchronous pull-out and liftable expansion table to be easily switched from the expanded state to the stored state.

[0078] Furthermore, in this embodiment, if Figure 1 , Figure 2 as well as Figure 3As shown, the unlocking structure 4 includes a pulling rod 41, an unlocking rod 42 and a handle 43. The pulling rod 41 can be rotatably set on the frame structure 3 and is parallel to the central crossbeam 34. At the same time, the pulling rod 41 can reciprocate along its axial direction; the unlocking rod 42 is vertically fixed on the pulling rod 41, and the handle 43 is fixed to one end of the pulling rod 41, and the handle 43 is set at the side edge of the frame structure 3. When the synchronous pulling structure 2 is self-locking, the handle 43 is rotated to make the unlocking rod 42 vertically upward, and at the same time, the handle 43 is held tightly and pulled back and forth along the axial direction of the pulling rod 41. The unlocking rod 42 contacts the connecting rod 212 and causes the connecting rod 212 to rotate, thereby breaking the self-locking balance of the synchronous pulling structure 2, so that the synchronous pulling structure 2 is unlocked.

[0079] As described above, the synchronous pull-out lifting expansion table of the utility model has the following beneficial effects: when in use, the synchronous pull-out lifting expansion table of the utility model can be switched between the unfolded state and the stowed state according to the usage scenario, specifically:

[0080] In a scenario where multiple people use the table, such as a dinner party, the two side table panels 12 are pulled toward the sides of the center table panel 11, and the side table panels 12 slide toward the sides of the center table panel 11. The rotating base 21 rotates under the pull of the two swing arms 22. When the distance between the two side table panels 12 just accommodates the center table panel 11, the lifting member 23 rotates to the lower side of the wedge-shaped member 113 to push out the center table panel 11 and align it with the side table panels 12 on both sides. The synchronously pull-out lifting expansion table is in an unfolded state. At this time, the area of ​​the table panel structure 1 is expanded, which is very suitable for use by multiple people.

[0081] For example, in a scenario where a small number of people use the table in daily life, the two side table panels 12 can be pushed inward to drive the rotating base 21 to rotate, the lifting member 23 is disengaged from the wedge-shaped member 113, the middle table panel 11 descends, and the two side table panels 12 continue to approach each other until they abut against each other and the middle table panel 11 is stored under the side table panels 12. The synchronously pull-out lifting expansion table is in a stored state. At this time, the area of ​​the table panel structure 1 is reduced, and the area occupied by the synchronously pull-out lifting expansion table is reduced, which meets daily use while reducing the placement space;

[0082] When the synchronous pull-out and liftable expansion table of the utility model is switched between the unfolded state and the stowed state, it is only necessary to control the pulling and pulling of the side table panels 12. The lifting and lowering of the middle table panel 11 is automatically completed by the swing arm 22 driving the rotating base 21 to rotate. Compared with the structure of the traditional pull-out table in which the middle table panel 11 is manually lifted, the deformation operation is simple and convenient, the stability is good, and the structure is simple and the cost is lower.

[0083] In summary, the synchronous pull-out and liftable expansion table of the utility model uses the synchronous pull-out structure 2, so that when switching between the unfolded state and the stored state, the side table board 12 is pulled out, and the middle table board 11 is lifted synchronously, which is convenient for operation and more stable in structure, and solves the problems of poor stability, inconvenient deformation and high price caused by manual lifting of the middle table board 11 of the pull-out expansion table in the prior art. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0084] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A synchronous pull-out lifting expansion table, comprising: A table board structure (1), the table board structure (1) comprising a middle table board (11) and two side table boards (12) arranged on both sides of the middle table board (11), the two side table boards (12) being arranged to slide, and characterized in that it also comprises a middle table top lifting component and a synchronous pull-out structure (2), the middle table board lifting component realizing lifting and lowering of the middle table board (11) under the drive of the synchronous pull-out structure (2); The synchronous pulling structure (2) comprises a rotating base (21), two swing arms (22) one end of which is rotatably arranged on the rotating base (21), the middle table board (11) is arranged on the rotating base (21), and the other ends of the two swing arms (22) are rotatably connected to the corresponding side table boards (12), and the swing arms (22) are pulled to extend toward both sides, thereby driving the rotating base (21) to rotate; The two side table panels (12) are pulled toward both sides of the center table panel (11), and the side table panels (12) slide toward both sides of the center table panel (11). The rotating base (21) rotates under the pull of the two swing arms (22). When the distance between the two side table panels (12) just accommodates the center table panel (11), the center table panel lifting assembly pushes the center table panel (11) out and aligns it with the side table panels (12) on both sides, and the synchronously pull-out and liftable expansion table is in an unfolded state; then the two side table panels (12) are pushed inward to drive the rotating base (21) to rotate, and the center table panel lifting assembly drives the center table panel to descend to the storage position. The two side table panels (12) continue to approach each other until they abut against each other and store the center table panel (11) under the side table panels (12), and the synchronously pull-out and liftable expansion table is in a storage state.

2. The synchronous pull-out lifting expansion table according to claim 1 is characterized in that: The center table board lifting assembly includes a wedge-shaped piece (113) arranged at the bottom of the center table board and a lifting piece (23) arranged on the rotating base (21); the lifting piece (23) rotates to the lower side of the wedge-shaped piece (113) to lift the center table board (11); when the lifting piece (23) is disengaged from the wedge-shaped piece (113), the center table board (11) descends.

3. The synchronous pull-out lifting expansion table according to claim 1 is characterized in that: The synchronously pull-out and liftable expansion table also includes a frame structure (3), the two side table panels (12) are slidably arranged on the frame structure (3), and the middle table panel (11) is located in the middle of the frame structure (3).

4. The synchronous pull-out lifting expansion table according to claim 3 is characterized in that: A central crossbeam (34) is provided on the frame structure (3), and the rotating base (21) is fixed on the central crossbeam (34).

5. The synchronous pull-out lifting expansion table according to claim 2 is characterized in that: The rotating base (21) comprises a rotating shaft (211), a connecting rod (212) and an ejector rod (213); the middle parts of the connecting rod (212) and the ejector rod (213) are fixed to each other and rotatably arranged on the rotating shaft (211); the two ends of the connecting rod (212) are respectively hinged to the two swing arms (22); and the ejector member (23) is arranged on the ejector rod (213).

6. The synchronous pull-out lifting expansion table according to claim 2, characterized in that: The middle table top (11) is provided with a plurality of evenly distributed wedge-shaped pieces (113), and the rotating base (21) is provided with a plurality of lifting pieces (23) corresponding to the wedge-shaped pieces (113).

7. The synchronous pull-out lifting expansion table according to claim 2, characterized in that: The wedge-shaped member (113) comprises a wedge-shaped surface (113a) and a horizontal surface (113b) connected to the wedge-shaped surface (113a); when the lifting member (23) slides along the wedge-shaped surface (113a) to the horizontal surface (113b), the middle table top (11) is lifted.

8. The synchronously pull-out lifting expansion table according to claim 7, characterized in that: The lifting member (23) adopts a roller, and the roller is used to reduce the friction force when the lifting member (23) slides along the wedge surface (113a) and the horizontal surface (113b).

9. The synchronous pull-out lifting expansion table according to claim 1, characterized in that: When the synchronously drawable lifting expansion table is in an unfolded state, the two swing arms (22) are located on the same straight line, and the synchronously drawable structure (2) is self-locking.

10. The synchronously pull-out lifting expansion table according to claim 9, characterized in that: The synchronously pull-out lifting expansion table further comprises an unlocking structure (4). When the synchronously pull-out structure (2) is self-locked, the unlocking structure (4) is used to drive the rotating base (21) to rotate, thereby unlocking the synchronously pull-out structure (2).

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