Transformable round table with two expanded configurations

Abstract

The utility model discloses a kind of two kinds of morphological transformation round table with expansion form, including base, main body frame, four sector table board, two groups of expansion table board assembly one and a group of expansion table board assembly two, main body frame is as the utility model to realize 3 kinds of mode execution structure, four sector table board closure forms small round table top, expansion table board assembly one can be accomodated hidden in folding state, and elliptical table top is formed by being spliced with sector table board in unfolded state, expansion table board assembly two can be accomodated hidden in folding state, and large round table top is formed by being spliced with sector table board and expansion table board assembly one respectively in unfolded state.The utility model is provided with two expansion table board assembly that can be accomodated hidden, can show small round table, three modes of being unfolded into elliptical table from small round table, and being unfolded into large round table again, can effectively reduce the entire floor area, increase the space used simultaneously, convenient and practical.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, specifically to a deformable round table with three forms and two extended forms. Background Technology

[0002] The primary task in improving the living environment is to create more space for people to move around freely in a limited space. As society develops, the contradiction of living space in modern society has intensified. Innovation in space utilization is one of the effective ways to solve this problem.

[0003] To make efficient use of limited space, many people choose extendable tables. When needed, the table is extended, and when finished, it is retracted. This way, our space does not feel too cramped, and the operation is not too complicated. Everything can be done with a simple action or by pressing a button.

[0004] As for round tables, their unique shape limits the variety of tabletop options. While there are fewer types of round tables on the market that can change their tabletop size compared to square tables, there are still quite a few. However, all these transformable round tables share a common characteristic: they can generally only be unfolded once, possessing both folded and unfolded forms. Summary of the Invention

[0005] The main purpose of this utility model is to provide a deformable round table with three forms, so as to overcome the limitation that existing round tables can generally only be unfolded once.

[0006] To solve the above-mentioned technical problems, this utility model proposes a deformable round table with two extended forms, including: A base consisting of four legs; The main frame is fixedly mounted on the base. The main frame includes a pair of crossbeams, a pair of rectangular sliding frames, and a rectangular fixed frame. The two crossbeams are arranged in parallel and fixedly mounted on the top of the base. The short side of each rectangular sliding frame is slidably mounted on the two crossbeams. A fixed shaft parallel to its long side is fixedly mounted on the outer part of each rectangular sliding frame. A fixed shaft parallel to the short side of the rectangular fixed frame is provided on the rectangular fixed frame and between the rectangular sliding frame and the rectangular fixed frame. The short side of the rectangular fixed frame is fixedly mounted on the bottom of the two crossbeams and is flush with the crossbeams. Four sector-shaped tabletops with a radius of R and a central angle of 90° are symmetrically mounted on the two long sides of the rectangular sliding frame and are respectively slidably assembled. The four sector-shaped tabletops are assembled together to form a small circular tabletop. Two sets of extended tabletop components are respectively mounted on a fixed shaft by a rotating seat. In the folded state, they can be stored between a rectangular fixed frame and a fixed shaft. In the unfolded state, they can be spliced ​​with a fan-shaped tabletop to form an elliptical tabletop. The rotating seat is mounted on the fixed shaft. The inner side center of the two rectangular sliding frames is provided with elastic limiting pieces for limiting the side of the extended tabletop component away from the fixed shaft in the stored state. The second extension table assembly is rotatably mounted on the second fixed shaft via the second rotating seat. In the folded state, it can be stored in the rectangular fixed frame. In the unfolded state, it can be spliced ​​with the fan-shaped table and the first extension table assembly to form a large circular tabletop. The second rotating seat is rotatably mounted on the second fixed shaft. The bottom of the rectangular fixed frame, on the side away from the second fixed shaft, is provided with a limiting beam for limiting the position of the second extension table assembly in the folded state.

[0007] Furthermore, each of the two crossbeams is provided with a sliding groove on its opposite side, and a pulley seat is fixed at both ends of each sliding groove. Each of the rectangular sliding frames is provided with a second sliding groove on its short side, and each of the second sliding grooves is provided with a second pulley seat at its inner end. Each pulley seat one is provided with a pulley group one that is tactilely assembled with the slide groove two, and each pulley seat two is provided with a pulley group two that is tactilely assembled with the slide groove one.

[0008] Furthermore, a sliding groove 3 is provided on the inner side of the outer side of a single rectangular sliding frame. A limiting post is provided in the sliding groove 3 at the center of the outer side of the rectangular sliding frame. Two sets of pulley groups 3 symmetrical to the limiting post are rolled in the sliding groove 3. Each pulley group 3 is provided with a pulley seat 3. The four fan-shaped table boards are fixedly connected to the four pulley seats 3 one-to-one.

[0009] Furthermore, each of the individual fan-shaped tabletops has reinforcing ribs that are perpendicular to each other and parallel to the two right-angled sides of the fan-shaped tabletop. The reinforcing ribs that are parallel to the crossbeam are fixedly assembled with the corresponding pulley seats.

[0010] Furthermore, each of the rectangular sliding frames has a sliding groove four on the outer side of its inner side, and each of the fan-shaped tabletops has a sliding table fixedly installed at its bottom to slide and adapt to the sliding groove four.

[0011] Furthermore, the extended table assembly consists of two rectangular extended panels with their sides hinged together. In the folded state, the two rectangular extended panels are folded up and down, with the hinged edges on the outside. The upper extended table is fixedly connected to the corresponding rotating seat, and the lower extended table is limited by an elastic limiting piece. In the unfolded state, the two rectangular extended panels are respectively spliced ​​with the fan-shaped table panels on both sides. The length of one side of each rectangular extended panel parallel to the crossbeam is R / 2, and the length of the other pair of opposite sides is L.

[0012] Furthermore, the extended table panel assembly 2 consists of two rectangular extended panels 2 with their sides hinged together. In the folded state, the two rectangular extended panels 2 are folded up and down. The upper rectangular extended panel 2 is fixedly connected to the rotating seat 2 and is limited by the limiting beam. In the unfolded state, the two rectangular extended panels 2 are respectively spliced ​​with the fan-shaped table panels and the rectangular extended panel 1 on both sides. The length of the side of each rectangular extended panel 2 perpendicular to the crossbeam is R+L / 2.

[0013] Furthermore, the elastic limiting piece includes: The supporting part that abuts against one side of the rectangular extension panel located below when folded; A vertical mounting part that is fixedly connected to the center of the inner side of a rectangular sliding frame; A horizontal section that is perpendicular to the top of the vertical mounting section and whose top surface is flush with the top surface of the long side of the rectangular sliding frame, and A ramp that connects the horizontal section and the supporting section and slides against one side of the rectangular expansion plate.

[0014] Furthermore, each of the individual fan-shaped tabletops is also provided with an arc-shaped skirt on its curved side, and the four arc-shaped skirts form a complete circle to cover the main frame.

[0015] Furthermore, the length of the crossbeam is L1, and the length of the shorter side of the rectangular sliding frame is L2, satisfying: L1 = 2L2.

[0016] Compared with the prior art, the advantages of this utility model are: This utility model features two retractable and concealable extendable tabletop components, which can be displayed as a small round table, unfolded into an oval table, and then unfolded into a large round table in three different forms. This effectively reduces the overall floor space while increasing the usable space, making it convenient and practical. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of the initial small round table form of this utility model. Figure 2 In order to be in Figure 1 Based on this, the structural diagram after removing the four fan-shaped tabletops (3) is shown. Figure 3 for Figure 2Top view, Figure 4 This is a schematic diagram showing the assembly relationship between the crossbeam 21 and the rectangular fixing frame 23. Figure 5 This is a schematic diagram of the rectangular sliding frame 22. Figure 6 This is a structural schematic diagram of the rectangular fixed frame 23. Figure 7 This is a structural schematic diagram of the fan-shaped tabletop 3. Figure 8 This is a schematic diagram of the structure of the elastic limiting piece 5. Figure 9 This is a structural schematic diagram of the first extended form of this utility model—an oval table. Figure 10 This is a structural diagram of the second extended form of this utility model—a large round table. Figure 11 for Figure 10 Top view, The attached figures are labeled as follows: Base 1; Main frame 2, crossbeam 21, slide rail 1 211, pulley seat 1 212, pulley block 1 213, rectangular sliding frame 22, slide rail 2 221, pulley seat 2 222, pulley block 2 223, slide rail 3 224, limiting post 225, pulley block 3 226, pulley seat 3 227, slide rail 4 228, slide table 229, rectangular fixed frame 23, fixed shaft 1 24, rotating seat 1 25, fixed shaft 2 26, rotating seat 2 27; Fan-shaped tabletop 3, reinforcing rib 31, skirt 32; Extended tabletop component 4, rectangular extension board 41; Elastic limiting piece 5, lifting part 51, vertical mounting part 52, horizontal part 53, and ramp part 54; Extended tabletop component 26, rectangular extended board 261; Limiting beam 7; Small round desktop 100, oval desktop 200, large round desktop 300. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please refer to Figures 1 to 11 This utility model provides a deformable round table with two extension forms, including a base 1 composed of four legs, a main frame 2, four fan-shaped tabletops 3, two sets of extension tabletop assemblies 4, and one set of extension tabletop assemblies 6. The main frame 2 is fixedly assembled onto the base 1, with the base 1 serving as the support for the main frame 2. The main frame 2, in turn, is the execution structure for achieving the three forms of this utility model. Specifically... like Figures 2 to 6 The main frame 2 includes a pair of crossbeams 21, a pair of rectangular sliding frames 22 and a rectangular fixed frame 23; Two crossbeams 21 are arranged in parallel and fixedly assembled on the top of the base 1 respectively. During the process of shape change, the two crossbeams 21 of this utility model remain fixed. The single rectangular sliding box 22 has a rectangular structure, with a short side and a long side, such as... Figure 5Each rectangular sliding frame 22 has its short sides slidably mounted on two crossbeams 21. Specifically, each rectangular sliding frame 22 has its two short sides slidably mounted on the corresponding crossbeams 21. In one embodiment, the specific structure of the sliding assembly between the rectangular sliding frame 22 and the crossbeams 21 is as follows: A first groove 211 is provided on the opposite sides of each of the two crossbeams 21. A pulley seat 212 is fixed at both ends of each first groove 211. A second groove 221 is provided on the short side of each rectangular sliding frame 22. A pulley seat 222 is provided at the inner end of each second groove 221. A pulley assembly 213 is provided on each pulley seat 212 that is rollably mounted with the second groove 221. A pulley assembly 223 is provided on each second pulley seat 222 that is rollably mounted with the first groove 211. The length of the crossbeam 21 is L1, and the length of the short side of the rectangular sliding frame 22 is L2, satisfying L1 = 2L2. Figure 3 ; Each rectangular sliding frame 22 has a fixed shaft 24 parallel to its long side fixedly installed at a position near the outside. A set of rotating seats 25 are rotatably mounted on the middle part of each fixed shaft 24. The two fixed shafts 24 are set as the rotation shafts of the two sets of extended table panels 4, while the rotating seats 25 are the connection structure between the fixed shafts 24 and the extended table panels 4. Note that the "outer" position here is with reference to the center of the deformable round table with two extension forms. "Outer" means away from the center of the deformable round table with two extension forms. The descriptions of the positions with "inner" and "outer" in the instruction manual are all based on the center of the deformable round table with two extension forms. like Figure 4 and Figure 6 A second fixed shaft 26 parallel to the short side of the rectangular fixed frame 23 is provided on the rectangular fixed frame 23 between the rectangular sliding frame 22 and the rectangular fixed frame 23. A set of rotating seats 27 is rotatably mounted on the second fixed shaft 26. The short sides of the rectangular fixed frame 23 are respectively fixedly assembled to the bottom of the two crossbeams 21 and are flush with the crossbeams 21. The second fixed shaft 26 is set as the rotation axis of the extension table assembly 26, while the second rotating seat 27 is the connection structure between the second fixed shaft 26 and the extension table assembly 26. like Figure 1 , Figure 9 , Figure 10 and Figure 11 Four fan-shaped tabletops 3 are symmetrically arranged in pairs and slidably mounted on the two long sides of a rectangular sliding frame 22. The central angle of each fan-shaped tabletop 3 is 90° and the radius is R. The four fan-shaped tabletops 3 are assembled together to form a small circular tabletop 100. Each fan-shaped tabletop 3 also has an arc-shaped skirt 32 on its curved side. The four arc-shaped skirts 32 form a complete circle to cover the main frame 2. As one embodiment, the sliding assembly structure between the four fan-shaped tabletops 3 and the rectangular sliding frame 22 is as follows: A single rectangular sliding frame 22 has a sliding groove 224 on the inner side of its outer side, such as... Figure 5 A limiting post 225 is provided in the center of the outer side of the rectangular sliding frame 22 inside the sliding groove 224. Two sets of pulley groups 226 are symmetrically arranged with respect to the limiting post 225 inside the sliding groove 224. Each pulley group 226 is provided with a pulley seat 227. The four fan-shaped table plates 3 are fixedly connected to the four pulley seats 227 one by one. The bottom surface of each fan-shaped table plate 3 is provided with reinforcing ribs 31 that are perpendicular to each other and parallel to the two right-angled sides of the fan-shaped table plate 3. The reinforcing ribs 31 that are parallel to the crossbeam 21 are fixedly assembled with the corresponding pulley seats 227, realizing the sliding assembly between the fan-shaped table plate 3 and the outer long side of the rectangular sliding frame 22. A single rectangular sliding frame 22 has a sliding groove 228 on the outer side of its inner side, such as... Figure 2 and Figure 7 Each fan-shaped table 3 has a fixed bottom with a slide table 229 that is adapted to slide groove 4 228. The slide table 229 is slidably assembled in slide groove 4 228. The slide table 229 is fixedly assembled with the bottom of the fan-shaped table 3, realizing the sliding assembly between the fan-shaped table 3 and the inner long side of the rectangular sliding frame 22. The two sets of extended table panels 4 are respectively rotatably assembled on the fixed shaft 24 via the rotating base 25, as shown. Figure 2 and Figure 3 The extended tabletop assembly 4, in its folded state, can be stored between the rectangular fixed frame 23 and the fixed axis 24; in its unfolded state, it is joined with the fan-shaped tabletop 3 to form an elliptical tabletop 200. The inner sides of the two rectangular sliding frames 22 are respectively provided with elastic limiting pieces 5 for limiting the side of the extended tabletop assembly 4 away from the fixed axis 24 in its folded state. The arrangement of the two sets of extended tabletop assemblies 4 can realize the first extended form of this utility model – an elliptical table. Specifically… The extended tabletop assembly 4 consists of two rectangular extended panels 41 that are hinged to each other on both sides. The hinges can be used, or other hinge methods can be used. This utility model does not limit the types of hinges. In the folded state, the two rectangular extension plates 41 fold vertically, with the hinged edges on the outside. The upper rectangular extension plate 41 is fixedly connected to the corresponding rotating base 25, while the lower rectangular extension plate 41 is limited by the elastic limiting piece 5. Figure 8 The elastic limiting piece 5 includes: The supporting part 51 abuts against the side of the rectangular extension plate 41 located below after folding; A vertical mounting part 52 is fixedly connected to the center of the inner side of the rectangular sliding frame 22; The horizontal part 53, which is perpendicular to the top of the vertical mounting part 52 and whose top surface is flush with the top surface of the long side of the rectangular sliding frame 22, and A ramp 54 that connects the horizontal part 53 and the supporting part 51 and slides against the side of the rectangular expansion plate 41. The two rectangular expansion panels 41 in their unfolded state are spliced ​​together with the two fan-shaped tabletops 3 on either side. This indicates that the splicing edges of the two rectangular expansion panels 41 and the fan-shaped tabletops 3 after unfolding must be compatible with the radius of the fan-shaped tabletops 3. Therefore, the length of one side of a single rectangular expansion panel 41 parallel to the crossbeam 21 is R / 2, and the length of the other pair of opposite sides is L. Figure 11 ; When folded, the two rectangular extension plates 41 are folded vertically. The upper rectangular extension plate 41 is rotatably assembled with the fixed shaft 24 via the rotating seat 25, and its inner side is pressed by the closed small circular tabletop 100. The inner side of the lower rectangular extension plate 41 is in contact with the elastic limiting piece 5 for limitation. When unfolding is required, slide the fan-shaped tabletops 3 outwards along the direction perpendicular to the crossbeam 21 to their furthest positions (fully exposing the two extended tabletop components 4). Then, lift the inner edges of the upper rectangular extension plate 41 and rotate it 180° around the fixed axis 24. During the rotation of the upper rectangular extension plate 41, the side of the lower rectangular extension plate 41 will slide upwards along the ramp 54 until its bottom rests on the horizontal part 53, so that the bottom surfaces of the two rectangular extension plates 41 abut against the two long sides of the rectangular sliding frame 22, and their top surfaces are flush with the top surfaces of the fan-shaped tabletops 3. Then, slide the previously moved fan-shaped tabletops 3 towards the center of the table along the direction perpendicular to the crossbeam 21 and join them with the unfolded rectangular extension plates 41 to form an elliptical tabletop 200. Figure 9 Note that after the extended table panel assembly 4 is rotated and unfolded, it should be flush with the fan-shaped table panel 3. Therefore, there are requirements for the height settings of the fixed shaft 24 and the rotating seat 25. These can be set according to the actual situation, and this utility model does not impose any limitations. The extended tabletop assembly 26 is rotatably mounted on the fixed shaft 26 via the rotating seat 27, as follows: Figure 2 and Figure 3 In its folded state, it can be stored inside a rectangular fixing frame 23. In its unfolded state, it can be spliced ​​with the fan-shaped tabletop 3 and the unfolded extended tabletop assembly 4 to form a large circular tabletop 300. The bottom of the rectangular fixing frame 23, on the side away from the fixing axis 26, is provided with a limiting beam 7 for limiting the position of the extended tabletop assembly 26 in the folded state. The setting of the extended tabletop assembly 26 can realize the second extension form of this utility model - a large round table. Specifically, The extended tabletop assembly 26 consists of two rectangular extended plates 261 that are hinged together on their sides. The plates can be hinged by hinges or other hinge methods. This utility model does not limit the types of hinges. In the folded state, the two rectangular expansion plates 61 are folded up and down. The upper rectangular expansion plate 61 is fixedly connected to the rotating seat 27, and the upper rectangular expansion plate 61 is limited by the limiting beam 7. In the unfolded state, the two rectangular extension plates 261 of the extended table assembly 26 are respectively spliced ​​with the fan-shaped table panels 3 on both sides and the two sets of rectangular extension plates 141. This means that the splicing edge of the two rectangular extension plates 261 with the fan-shaped table panels 3 after unfolding must be adapted to the radius of the fan-shaped table panels 3 and the side of the rectangular extension plate 141 with a length of L. Therefore, the length of the side of a single rectangular extension plate 261 perpendicular to the crossbeam 21 is R+L / 2. Figure 11 ; In the storage state, the two rectangular expansion plates 261 are folded up and down. The upper rectangular expansion plate 261 is rotatably assembled with the fixed shaft 26 via the rotating seat 27. The bottom of the lower rectangular expansion plate 261, away from the fixed shaft 26, abuts against the limiting beam 7 for limitation. When unfolding is required, slide the two sets of extended table panel assemblies 4 and the spliced ​​fan-shaped table panel 3, along with the rectangular sliding frame 22, outwards to their furthest positions along the direction parallel to the crossbeam 21 (fully exposing the folded extended table panel assembly 6 stored in the rectangular fixed frame 23). Then, lift the non-hinged edge of the upper rectangular extended panel 61 and rotate it 180° around the fixed axis 26. During the rotation of the upper rectangular extended panel 41, the bottom surface of the lower rectangular extended panel 41 and the limiting beam 7 will... The sliding mechanism pushes the rectangular expansion panels 61 upwards until their bottoms rest on the crossbeam 21, ensuring the bottom surfaces of the two rectangular expansion panels 61 are flush with the crossbeam 21 and their top surfaces are aligned with the top surfaces of the fan-shaped tabletop 3 and the rectangular expansion panel 41, respectively. Then, the two previously moved expansion panel assemblies 4, the fan-shaped tabletop 3 attached to the rectangular expansion panel 41, and the rectangular sliding frame 22 are slid together along a direction parallel to the crossbeam 21 towards the center of the table and joined to the two unfolded rectangular expansion panels 61, thus forming a large circular tabletop 300. Figure 10 Note that after the extended table panel assembly 26 is rotated and unfolded, it should be flush with the fan-shaped table panel 3. Therefore, there are requirements for the height settings of the fixed shaft 26 and the rotating seat 27. These can be set according to the actual situation, and this utility model does not impose any limitations.

[0025] This utility model's deformable round table with two extended forms has two extended forms, plus the initial small round table form, for a total of three forms: 1. Extended tabletop component 1 (4) is concealed between the rectangular fixed frame 23 and the fixed shaft 24. Extended tabletop component 2 (6) is concealed within the rectangular fixed frame 23. The four fan-shaped tabletops (3) are closed, presenting a small round table shape with the four fan-shaped tabletops (3) closed, as shown. Figure 1 ; 2. Extended tabletop component 1 4 unfolds, and extended tabletop component 2 6 is stored and hidden within the rectangular fixing frame 23, presenting an elliptical tabletop shape formed by the splicing of four fan-shaped tabletops 3 and two unfolded extended tabletop components 1 4, as shown. Figure 9 ; 3. Extendable tabletop component 1 (4) unfolds, and extended tabletop component 2 (6) unfolds, revealing a large round table formed by combining four fan-shaped tabletops (3), the unfolded extended tabletop component 1 (4), and the unfolded extended tabletop component 2 (6). Figure 10 .

[0026] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A deformable round table with two extended forms, characterized in that, include: A base consisting of four legs (1); The main frame (2) is fixedly mounted on the base (1). The main frame (2) includes a pair of crossbeams (21), a pair of rectangular sliding frames (22) and a rectangular fixed frame (23). The two crossbeams (21) are arranged in parallel and fixedly mounted on the top of the base (1). The short side of a single rectangular sliding frame (22) is slidably mounted on the two crossbeams (21). A fixed shaft (24) parallel to its long side is fixedly mounted on the outer side of the single rectangular sliding frame (22). A fixed shaft (26) parallel to the short side of the rectangular fixed frame (23) is provided on the rectangular fixed frame (23) and between the rectangular fixed frame (23) and the rectangular sliding frame (22). The short side of the rectangular fixed frame (23) is fixedly mounted on the bottom of the two crossbeams (21) and is flush with the crossbeams (21). Four fan-shaped tabletops (3) with radius R and central angle 90° are symmetrically mounted on the two long sides of the rectangular sliding frame (22) and slidably mounted on each other. The four fan-shaped tabletops (3) are assembled together to form a small circular tabletop (100). Two sets of extended tabletop components (4) are respectively mounted on the fixed shaft (24) by rotating the rotating seat (25). In the folded state, they can be stored between the rectangular fixed frame (23) and the fixed shaft (24). In the unfolded state, they are spliced ​​with the fan-shaped tabletop (3) to form an elliptical tabletop (200). The rotating seat (25) is mounted on the fixed shaft (24). The inner side center of the two rectangular sliding frames (22) is provided with elastic limiting pieces (5) for limiting the side of the extended tabletop component (4) away from the fixed shaft (24) in the stored state. The second extension table assembly (6) is rotatably mounted on the second fixed shaft (26) via the second rotating seat (27). In the folded state, it can be stored in the rectangular fixed frame (23). In the unfolded state, it is spliced ​​with the fan-shaped table (3) and the first extension table assembly (4) to form a large circular tabletop (300). The second rotating seat (27) is rotatably mounted on the second fixed shaft (26). The bottom of the rectangular fixed frame (23) and the side away from the second fixed shaft (26) are provided with a limiting beam (7) for limiting the extension table assembly (6) in the folded state.

2. The deformable round table with two extended forms according to claim 1, characterized in that, The two crossbeams (21) are respectively provided with a sliding groove (211) on opposite sides, and a pulley seat (212) is fixed at both ends of each sliding groove (211). Each of the rectangular sliding frames (22) has a second sliding groove (221) on its short side, and each of the second sliding grooves (221) has a second pulley seat (222) at its inner end. Each of the first pulley seats (212) is provided with a pulley group (213) that is rolledly assembled with the second slide groove (221), and each of the second pulley seats (222) is provided with a pulley group (223) that is rolledly assembled with the first slide groove (211).

3. The deformable round table with two extended forms according to claim 2, characterized in that, A sliding groove (224) is provided on the inner side of the outer side of a single rectangular sliding frame (22). A limiting post (225) is provided in the sliding groove (224) at the center of the outer side of the rectangular sliding frame (22). Two sets of pulley groups (226) symmetrical to the limiting post (225) are rolled in the sliding groove (224). Each pulley group (226) is provided with a pulley seat (227). The four fan-shaped table boards (3) are fixedly connected to the four pulley seats (227) one by one.

4. The deformable round table with two extended forms according to claim 3, characterized in that, The bottom surface of a single fan-shaped table (3) is provided with reinforcing ribs (31) that are perpendicular to each other and parallel to the two right-angled sides of the fan-shaped table (3). The reinforcing ribs (31) that are parallel to the crossbeam (21) are fixedly assembled with the corresponding pulley seat three (227).

5. The deformable round table with two extended forms according to claim 4, characterized in that, Each rectangular sliding frame (22) has a sliding groove four (228) on the outer side of its inner side, and each fan-shaped table (3) has a sliding table (229) fixed at its bottom that is adapted to slide with the sliding groove four (228).

6. The deformable round table with two extended forms according to claim 1, characterized in that, The extended table panel assembly (4) consists of two rectangular extended panels (41) with their sides hinged together. In the folded state, the two rectangular extended panels (41) are folded up and down, with the hinged sides on the outside. The upper rectangular extended panel (41) is fixedly connected to the corresponding rotating seat (25), and the lower rectangular extended panel (41) is limited by the elastic limiting piece (5). In the unfolded state, the two rectangular extended panels (41) are spliced ​​with the fan-shaped table panels (3) on both sides respectively. The length of one side of a single rectangular extended panel (41) parallel to the crossbeam (21) is R / 2, and the length of the other pair of opposite sides is L.

7. The deformable round table with two extended forms according to claim 6, characterized in that, The extended table panel assembly 2 (6) consists of two rectangular extended panels 2 (61) with their sides hinged together. In the folded state, the two rectangular extended panels 2 (61) are folded up and down. The rectangular extended panel 2 (61) located above is fixedly connected to the rotating seat 2 (27). The rectangular extended panel 2 (61) located above is limited by the limiting beam (7). In the unfolded state, the two rectangular extended panels 2 (61) are spliced ​​with the fan-shaped table panel (3) and the rectangular extended panel 1 (41) on both sides respectively. The length of the side of each rectangular extended panel 2 (61) perpendicular to the crossbeam (21) is R+L / 2.

8. The deformable round table with two extended forms according to claim 6, characterized in that, The elastic limiting piece (5) includes: The lifting part (51) abuts against the side of the rectangular extension plate (41) located below after folding. A vertical mounting part (52) is fixedly connected to the center of the inner side of the rectangular sliding frame (22); The horizontal part (53) that is perpendicular to the top of the vertical mounting part (52) and whose top surface is flush with the top surface of the long side of the rectangular sliding frame (22), and A ramp (54) that connects the horizontal part (53) and the supporting part (51) and slides against the side of the rectangular extension plate (41).

9. The deformable round table with two extended forms according to claim 1, characterized in that, Each of the fan-shaped tabletops (3) is also provided with an arc-shaped skirt (32) on its arc side. The four arc-shaped skirts (32) form a complete circle to block the main frame (2).

10. The deformable round table with two extended forms according to claim 1, characterized in that, The length of the crossbeam (21) is L1, and the length of the shorter side of the rectangular sliding frame (22) is L2, satisfying: L1 = 2L2.

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