A dining table with an adjustable tabletop

Abstract

The present invention relates to a dining table with a changeable tabletop, comprising a tabletop panel, table legs, a table frame and a hollow mechanism for rising and rotating, wherein the tabletop panel comprises a first tabletop panel and a second tabletop panel, wherein the second tabletop panel has two pieces, which are respectively located on both sides of the first tabletop panel and are fixedly connected to the table legs; the first tabletop panel can perform rising and rotating movements under the action of the hollow mechanism for rising and rotating, and the first tabletop panel and the second tabletop panel are combined to form a complete round tabletop; the table legs are at least three, and the second tabletop panel is fixed to the upper ends of the table legs; the table frame is fixed to the lower surface of the first tabletop panel, comprising two fixing strips whose two ends are fixed to the lower surface of the first tabletop panel and are suspended in the middle, and the first tabletop panel is located above the hollow mechanism for rising and rotating; the hollow mechanism for rising and rotating is fixed to the two fixing strips of the table frame. The operation is simple and convenient, and the structure is firm and comfortable.

Description

Technical Field

[0001] The invention relates to the field of furniture, in particular to a dining table with a changeable tabletop. Background Art

[0002] A dining table is a must-have piece of furniture for every household. Among the existing furniture, there is a popular dining table: when there are fewer people eating, it is a rectangular table with a pair of opposite sides being straight and the other pair of opposite sides being curved; when there are more people eating, the supplementary blocks on both sides of the two straight sides can be "rolled up" to form a complete round table. This round table in the prior art saves space, but it also has the following defects:

[0003] (1) The operation is relatively cumbersome. It requires two people to operate at the same time, or one person to perform the same action twice in two different positions;

[0004] (2) After the "rectangular table" is changed into a "round table", the wooden structure under the supplementary block will easily hinder people's legs, causing interference and seriously affecting people's comfort;

[0005] (3) The dining table in the prior art is prone to unstable legs after long-term use;

[0006] The existing convertible dining table of this type does not have a turntable. Even if a turntable is provided, it needs to be added separately. When it is needed, it is put on, and when it is not needed, it is taken down, which is very troublesome. Summary of the invention

[0007] In view of the fact that there is no device in the prior art that meets the above requirements, the present invention provides a dining table with a changeable tabletop, including a tabletop panel, table legs, a table frame and an ascending and rotating hollow mechanism, the tabletop panel includes a first tabletop panel and a second tabletop panel, the second tabletop panel has two pieces, which are respectively located on both sides of the first tabletop panel and fixedly connected to the table legs; the first tabletop panel can perform ascending and rotating movements under the action of the ascending and rotating hollow mechanism, and the first tabletop panel and the second tabletop panel are combined to form a complete round tabletop; there are at least three table legs, and the second tabletop panel is fixed to the upper ends of the table legs; the table frame is fixed to the lower surface of the first tabletop panel, including two fixing strips whose two ends are fixed to the lower surface of the first tabletop panel and are suspended in the middle, and the first tabletop panel is located above the ascending and rotating hollow mechanism; the ascending and rotating hollow mechanism is fixed on the two fixing strips of the table frame.

[0008] Preferably, the table frame also includes a strip connecting plate fixedly connected to four table legs, the four strip connecting plates form a square frame, and the table legs are located on the four legs of the square frame; a reinforcement block is provided at the position of the table legs to fixedly connect the two ends of two adjacent strip connecting plates; a load-bearing bar is provided between the two long sides of the strip connecting plates and the first table top panel.

[0009] Preferably, a turntable is provided above the first desktop panel, and a turntable rail is provided below the turntable, the turntable rail is supported by at least three support columns, and the upper ends of the support columns are fixedly connected to the turntable rail by screws; the lower ends of the support columns are suspended, not fixed, and supported by an ascending and rotating hollow mechanism; the turntable is in a pie shape or a ring shape.

[0010] Preferably, the ascending and rotating hollow mechanism comprises an outer lifting turntable, a lifting mechanism, a rotating device, and a spiral guide groove base, wherein the lifting mechanism is movably connected to the outer lifting turntable and the spiral guide groove base, the outer lifting turntable is used to push the rotating device upward, and is movably connected to the rotating device; the lifting mechanism directly acts on the outer lifting turntable, and indirectly realizes the lifting and lowering of the rotating device; the outer lifting turntable is located on one side of the spiral guide groove base; the rotating device comprises an inner lifting turntable; the upper cylinder mouth of the outer lifting turntable extends outward to form an annular horizontal platform perpendicular to the vertical direction; and a handle is also provided to be fixedly connected to the outer lifting turntable.

[0011] Preferably, the lifting mechanism is provided with at least three groups of guide wheel assemblies, each group includes but is not limited to bearings, bolts, and nuts; the bolts are fixed on the cylinder wall of the outer lifting turntable, and the bearings are fixed on the bolts; at least three spiral guide grooves are provided on the cylinder wall of the spiral guide groove base, and the bearings are located in the spiral guide grooves, and the width of the spiral guide grooves is greater than the outer diameter of the bearings. By rotating the outer lifting turntable, the bearings move in the spiral guide grooves, and the spiral guide grooves are in the shape of long strips, and there is a certain height difference between the two ends of the spiral guide grooves in the vertical direction; the lifting height of the mechanism can be changed by changing the spiral angle and spiral length of the spiral guide grooves; the initial position of the bearing is located at the lowest point of the spiral guide grooves; the outer lifting turntable also rises together with the bearing, and after the bearing rises to the highest point of the spiral guide groove and sits at the bearing seat position at the upper end of the spiral guide groove, the outer lifting turntable pushes the rotating device to the highest point and is supported by the outer lifting turntable; the rotating device rotates, driving the first desktop panel to rotate.

[0012] Preferably, the spiral guide groove is in a "V" shape, and the initial position of the bearing is at the lowest point of the "V"-shaped spiral guide groove; or the spiral guide groove is in an inverted "V" shape, and the initial position of the bearing is at the highest point of the inverted "V"-shaped spiral guide groove; the external lifting turntable can also rotate left and right, and the different spiral angles of the two groove sides of the "V"-shaped spiral guide groove or / and the inverted "V"-shaped spiral guide groove may not be equal, and the spiral lengths of the two different groove sides may also not be equal.

[0013] Preferably, the rotating device includes a first roller and an inner lifting turntable, the upper cylinder mouth of the inner lifting turntable extends outward to form an annular horizontal platform perpendicular to the vertical direction; the lower end surface of the annular horizontal platform of the inner lifting turntable is in direct contact with the outer lifting turntable, and is used to support the inner lifting turntable; at least three rollers are embedded on the cylinder wall of the spiral guide groove base, the first roller is in contact with the outer wall of the cylinder of the inner lifting turntable, and is used to guide the rotation and rise of the inner lifting turntable.

[0014] Preferably, a circular ring is provided between the horizontal surfaces where the inner lifting turntable contacts the outer lifting turntable, and the circular ring can be fixed on the outer lifting turntable or on the inner lifting turntable; the circular ring can be in sliding contact or rolling contact with the inner lifting turntable, and when in rolling contact, at least three first balls or second rollers are evenly provided on the circumference of the circular ring, for rolling contact with the lower surface of the annular horizontal platform of the inner lifting turntable extension section.

[0015] Preferably, the outer lifting turntable is in contact with the spiral guide groove base, and the outer lifting turntable is located below the rotating device and is used to support the rotating device. At least three groups of first balls or second rollers or a combination of the two are evenly embedded on the circumference of the cylinder wall of the spiral guide groove base; the inner and outer sides of the first balls or the second rollers are respectively the inner lifting turntable of the rotating device and the cylinder top frame; the outer lifting turntable is divided into an upper and a lower part, the lower part is fixedly connected to the spiral guide groove base, and the upper part is in contact with the rotating device and is used to support the inner lifting turntable of the rotating device, and the upper and lower parts of the outer lifting turntable cylinder in the circumferential direction include at least three groups of lifting structures.

[0016] Preferably, the lifting structure is divided into a concave and convex section and support sections located on the left and right sides of the concave and convex section; wherein, when the upper part of the outer lifting turntable is a convex section, the lower part corresponding to the convex section is a concave section; when the upper part of the outer lifting turntable is a concave section, the lower part corresponding to the concave section is a convex section, and the two are consistent with each other, and the left and right sides of the concave and convex section are support sections, and the support sections are located at the top end of the concave section and the bottom end of the convex section, and are used to support the inner lifting turntable lifted by the outer lifting turntable; each convex section of the outer lifting turntable has a tip, and the tip is in sliding contact or rolling contact with the end surface of the lower part of the outer lifting turntable during the rotation of the upper part of the outer lifting turntable.

[0017] The beneficial effects of the hollow mechanism of the present invention are:

[0018] (1) By installing a rising and rotating hollow mechanism on the table frame and operating the handle on the rising and rotating hollow mechanism, the first table top panel can be raised, the first table top panel can be rotated, and then the first table top panel can be dropped to the same horizontal position as the second table top panel, so that the "waist-shaped table" can be transformed into a round table, which is simple and convenient to operate.

[0019] (2) Also by adding a rising and rotating hollow mechanism, the vertical height of the table frame and table top is reduced, leaving more space for diners' legs to stretch, thereby improving comfort.

[0020] (3) The table frame also includes a strip connecting plate fixedly connected to the table legs. Four strip connecting plates form a square frame, and the table legs are located at the four corners of the square frame. A reinforcing block is provided at the table legs, and the reinforcing block fixedly connects the two ends of the two adjacent strip connecting plates. By providing the reinforcing block, the first and second table tops and the table legs are reinforced, solving the problem that the table legs are easily unstable after long-term use.

[0021] (4) A turntable is provided above the first table top, and a turntable is provided below the turntable. The turntable is supported by at least three support columns, and the upper ends of the support columns are fixedly connected to the turntable by screws. The rising and rotating hollow mechanism can integrate the turntable with the table body. The turntable can be raised when needed, and can be lowered when not needed, and placed on the same horizontal plane as the upper surface of the table top, thus avoiding the situation in which the turntable in traditional dining tables is separated from the dining table and needs to be frequently "moved up and down".

[0022] (5) A turntable for placing food plates can be integrated, and an induction cooker can be placed in the middle for eating hot pot or instantly heating food;

[0023] (6) The wood product processing process is dusty and noisy, causing great environmental pollution and harm to operators. Metal accessories have replaced many of the original wooden parts, making the processing simple, energy-saving and environmentally friendly. It is reliable and durable.

[0024] (7) After the “round table” was changed to a “waist-shaped table”, the restaurant space was effectively saved, thus effectively solving the problem of space utilization in small apartments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments or the description of the prior art will be introduced in more detail below.

[0026] Figure 1 It is a top view of one embodiment of a dining table with a changeable tabletop according to the present invention;

[0027] Figure 2 It is a top view of another embodiment of a dining table with a changeable tabletop according to the present invention;

[0028] Figure 3 It is a CC cross-sectional view of another embodiment of a dining table with a changeable tabletop before it is changed into a round table;

[0029] Figure 4It is a partial enlarged view of another embodiment of a dining table with a changeable tabletop before it becomes a round table;

[0030] Figure 5 It is a cross-sectional view of one embodiment of a dining table with a changeable tabletop according to the present invention after it is changed into a round table;

[0031] Figure 6 It is a three-dimensional view of a dining table with a changeable tabletop when it is inverted;

[0032] Figure 7 It is a front view of one embodiment of a hollow mechanism for rising and rotating a dining table with a changeable tabletop according to the present invention;

[0033] Figure 8 It is an AA cross-sectional view of one embodiment of a hollow mechanism for rising and rotating a dining table with a changeable tabletop according to the present invention;

[0034] Fig. 9 It is a three-dimensional view of an inner lifting turntable and a circular ring of one embodiment of a hollow mechanism for rising and rotating a dining table with a changeable tabletop according to the present invention;

[0035] Fig.10 It is a three-dimensional view of an outer lifting turntable of one embodiment of a hollow mechanism for rising and rotating a dining table with a changeable tabletop according to the present invention;

[0036] Fig.11 The three-dimensional view of the inner lifting turntable and the circular ring of one embodiment of the hollow mechanism for rising and rotating of a dining table with a changeable tabletop according to the present invention.

[0037] Fig.12 The present invention is a three-dimensional view of a spiral guide groove base of another embodiment of a hollow mechanism for ascending and rotating a dining table with a changeable tabletop according to the present invention.

[0038] Fig.13 The three-dimensional view of the ring of another embodiment of the hollow mechanism for rising and rotating of a dining table with a changeable tabletop according to the present invention.

[0039] Fig.14 The invention discloses a three-dimensional visual dining table with a changeable tabletop and a hollow structure for ascending and rotating.

[0040] Fig.15 The present invention is a three-dimensional view of another embodiment of the hollow mechanism for rising and rotating a dining table with a changeable tabletop after being lifted.

[0041] Fig.16 The present invention is a front view of another embodiment of a hollow mechanism for ascending and rotating a dining table with a changeable tabletop after it is elevated.

[0042] Fig.17The present invention is a BB cross-sectional view of another embodiment of the hollow mechanism for rising and rotating a dining table with a changeable tabletop after being lifted.

[0043] In the figure, 100 is an outer lifting turntable; 101 is a handle; 200 is a lifting mechanism; 201 is a bolt; 202 is a bearing; 203 is a spiral guide groove; 300 is a rotating device; 301 is a first roller; 302 is an inner lifting turntable; 303 is a circular ring; 304 is a first ball; 305 is a second roller; 306 is a second ball; 400 is a spiral guide groove base; 501 is a first table top panel; 502 is a second table top panel; 503 is a table foot; 504 is a fixing bar; 505 is a strip connecting plate; 506 is a reinforcing block; 507 is a turntable; 508 is a turntable; 509 is a support column; 510 is a load-bearing bar. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below.

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0046] It should be noted that when an element is referred to as being "disposed on" or "fixed on" another element, it can be directly on the other element or there can also be a central element. When an element is referred to as being "fixed on" another element, or being "fixedly connected" to another element, they can be fixed in a detachable manner or in a non-detachable manner. When an element is considered to be "connected" or "rotatably connected" to another element, it can be directly connected to the other element or there can be a central element at the same time. The terms "vertical", "horizontal" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method. The words "front", "rear", "left", "right", "up", "down", "bottom" and "top" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a particular component, respectively.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to restrict the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] like Figure 1 to Figure 17 As shown, a dining table with a changeable tabletop includes a tabletop panel, table legs 503, a table frame and an ascending and rotating hollow mechanism, the tabletop panel includes a first tabletop panel 501 and a second tabletop panel 502, the second tabletop panel 502 has two parts, which are respectively located on both sides of the first tabletop panel 501 and fixedly connected to the table legs 503; the first tabletop panel 501 can perform ascending and rotating movements under the action of the ascending and rotating hollow mechanism, and the first tabletop panel 501 and the second tabletop panel 502 are combined to form a complete round tabletop; the table legs are at least 3, and the second tabletop panel 502 is fixed to the upper end of the table legs 503; the table frame is fixed to the lower surface of the first tabletop panel 501, including 2 fixing bars 504 with both ends fixed to the lower surface of the first tabletop panel 501 and suspended in the middle, and the first tabletop panel 501 is located above the ascending and rotating hollow mechanism; the ascending and rotating hollow mechanism is fixed on the two fixing bars 504 of the table frame.

[0049] In one embodiment, the table frame also includes a strip connecting plate 505 fixedly connected to four table legs 503, the four strip connecting plates 505 form a square frame, and the table legs 503 are located at the four corners of the square frame; a reinforcing block 506 is provided at the position of the table legs 503 to fixedly connect the two ends of two adjacent strip connecting plates 505; a load-bearing bar 510 is provided between the two long sides of the strip connecting plates 505 and the first table top panel, which is used to prevent the first table top panel 501 from being deformed due to being suspended in the air for a long time.

[0050] In one embodiment, a turntable 507 is provided above the first desktop panel 501, and a turntable 508 is provided below the turntable 507. The turntable 508 is supported by at least three support columns 509, and the upper ends of the support columns 509 are fixedly connected to the turntable 508 by screws; the lower ends of the support columns 509 are suspended in the air, not fixed, and supported by an ascending and rotating hollow mechanism; the turntable is in a pancake shape or a ring shape.

[0051] As described above, one end of the support column 509 contacts the upper end surface of the spiral guide groove base 400 or the upper surface of the ring 303 .

[0052] In one embodiment, a hollow mechanism for ascending and rotating includes an outer lifting turntable 100, a lifting mechanism 200, a rotating device 300, and a spiral guide groove base 400, wherein the lifting mechanism 200 is movably connected to the outer lifting turntable 100 and the spiral guide groove base 400, the outer lifting turntable 100 is used to push the rotating device 300 upward, and is movably connected to the rotating device 300; the lifting mechanism 200 directly acts on the outer lifting turntable 100, and indirectly realizes the lifting and lowering of the rotating device 300; the outer lifting turntable 100 is located on one side of the spiral guide groove base 400; the rotating device 300 includes an inner lifting turntable 302.

[0053] In one embodiment, the upper cylinder mouth of the outer lifting turntable 100 extends outward to form an annular horizontal platform perpendicular to the vertical direction; a handle 101 is also provided to be fixedly connected to the outer lifting turntable 100. Furthermore, there are two handles 101, both of which are fixedly connected to the outer side of the cylinder wall of the outer lifting turntable 100 and arranged opposite to each other. In addition, multiple handles 101 can be provided as needed, respectively located on the circumference of the outer side of the cylinder wall of the outer lifting turntable 100, and the shape and length of the operating handle 101 can be adjusted as needed. The fixed connection method of the handle 101 and the outer wall of the cylinder wall of the outer lifting turntable 100 can be welding, or it can be a detachable fixed connection method such as bolts.

[0054] In one embodiment, the lifting mechanism 200 is provided with 4 groups, 3 groups of guide wheel assemblies, each group includes but is not limited to bearings, bolts, nuts; each group includes bolts 201, bearings 202 and spiral guide grooves 203; the bolts 201 are fixed on the cylinder wall of the outer lifting turntable 100, and the bearings 202 are fixed on the bolts 201; 4 spiral guide grooves 203 are provided on the cylinder wall of the spiral guide groove base 400, and the bearings 202 are located in the spiral guide grooves 203, and the width of the spiral guide grooves 203 is greater than the outer diameter of the bearings 202. By rotating the outer lifting turntable 100, the bearings 202 move in the spiral guide grooves 203. The spiral guide groove 203 is in the shape of a long strip and rises in a spiral manner. The two ends of the spiral guide groove 203 have a certain height difference in the vertical direction, that is, they are not at the same horizontal height. The size of the height difference determines the lifting height of the rotating device 300; the initial position of the bearing 202 is located at the lowest end of the spiral guide groove 203; the outer lifting turntable 100 also rises together with the bearing 202. After the bearing 202 rises to the highest point of the spiral guide groove 203 and is seated at the bearing seat position at the upper end of the spiral guide groove 203, the outer lifting turntable 100 pushes the rotating device 300 to the highest point and is supported by the outer lifting turntable 100.

[0055] In one embodiment, the spiral guide groove 203 is in a "V" shape, and the initial position of the bearing 202 is at the lowest point of the "V"-shaped spiral guide groove 203; or the spiral guide groove 203 is in an inverted "V" shape, and the initial position of the bearing is at the highest point of the inverted "V"-shaped spiral guide groove 203. This is an improved design, and when the bearing 202 is at the initial position at the lowest point, the user can pull the handle 101 in two different directions, either left or right, to lift the rotating device 300 upward.

[0056] In one embodiment, the rotating device 300 includes a first roller 301 and an inner lifting turntable 302, wherein the upper cylinder mouth of the inner lifting turntable 302 extends outward to form an annular horizontal platform perpendicular to the vertical direction; the lower end surface of the annular horizontal platform of the inner lifting turntable 302 is in direct contact with the outer lifting turntable 100, so as to support the inner lifting turntable 302; four first rollers 301 are embedded on the cylinder wall of the spiral guide groove base 400, and the first rollers 301 are in contact with the outer cylinder wall of the inner lifting turntable 302, and are used to guide the rotation and rise of the inner lifting turntable 302.

[0057] As described above, more than four first rollers 301 can be embedded in the wall of the spiral guide groove base 400 as needed.

[0058] In one embodiment, a ring 303 is provided between the horizontal surfaces where the inner lifting turntable 302 contacts the outer lifting turntable 100, which may be a low friction coefficient ring, a roller ring or a ball ring, and the ring 303 may be fixed on the outer lifting turntable 100 or the inner lifting turntable 302. Further, in order to reduce the friction between the ring 303 and the inner lifting turntable 302, the ring 303 may be made of a material with a small friction coefficient.

[0059] In one embodiment, eight sets of first balls 304 are evenly arranged on the circumference of the ring 303, and are used to roll with the lower surface of the annular horizontal platform of the extension section of the inner lifting turntable 302. On the one hand, the friction force can be reduced, and the rolling of the inner lifting turntable 302 is convenient; on the other hand, the first balls 304 can generate axial support force for the inner lifting turntable 302. In another embodiment, in order to maintain a small friction force while having a large axial support force for the inner lifting turntable 302, the four first balls 304 can be replaced by four second rollers 305.

[0060] In one embodiment, the outer lifting turntable 100 is in contact with the spiral guide groove base 400, and the outer lifting turntable 100 is located below the rotating device 300 and is used to support the rotating device 300. Four groups of first rollers 301 or second balls 306 or a combination of the two are evenly embedded on the circumference of the cylinder wall of the spiral guide groove base 400; the inner and outer sides of the first rollers 301 or the second balls 306 are the inner lifting turntable 302 of the rotating device 300 and the cylinder top frame 100 respectively; and the first rollers 301 or the second balls 306 are in rolling contact with the inner walls of the inner lifting turntable 302 of the rotating device 300 and the cylinder top frame 100 respectively; Furthermore, four first rollers 301 are embedded on the cylinder wall of the spiral guide groove base 400, and each first roller 301 can be replaced by a plurality of second balls 306, so that the inner lifting turntable 302 can move smoothly in the circumferential direction while ensuring smooth movement in the axial direction. The outer lifting turntable 100 is divided into an upper and a lower part, the lower part is fixedly connected to the spiral guide groove base 400, and the upper part is in contact with the rotating device 300, and is used to support the inner lifting turntable 302 of the rotating device 300, and the upper and lower parts of the outer lifting turntable 100 in the circumferential direction of the cylinder body include at least three sets of lifting structures.

[0061] In one of the embodiments, each lifting structure is divided into a concave-convex section and support sections located on the left and right sides of the concave-convex section; wherein, when the upper part of the outer lifting turntable is a convex section, the lower part corresponding to the convex section is a concave section; when the upper part of the outer lifting turntable 100 is a concave section, the lower part corresponding to the concave section is a convex section, and the two are matched with each other, and the left and right sides of the concave-convex section are support sections, and the support sections are located at the top end of the concave section and the bottom end of the convex section, and are used to support the inner lifting turntable 302 lifted by the outer lifting turntable 100; each convex section of the outer lifting turntable 100 has a tip, and the tip is in sliding contact or rolling contact with the end surface of the lower part of the outer lifting turntable 100 during the rotation of the upper part of the outer lifting turntable 100, such as Figure 14-17 shown.

[0062] The specific working principle is introduced as follows: before the variable dining table changes, the bearing 202 is located between the lowest end and the highest end of the spiral guide groove 203, the first table top panel 501 is above the two second table top panels 502, and the two arc-shaped edges of the first table top panel 501 coincide with the two arc-shaped edges of the second table top panel 502, thereby well hiding the two second table top panels 502. By pulling the handle 101 fixedly connected to the outer lifting turntable 100, the bearing 202 moves in the spiral guide groove 203 on the spiral guide groove base 400 and rises with the spiral guide groove 203. The outer lifting turntable 100 moves upward against the inner lifting turntable 302, and reaches the maximum height when the bearing 202 moves to the bearing seat at the upper end of the spiral guide groove 203; the inner lifting turntable 302 is rotated to rotate the first desktop panel 501 90 degrees. When the first desktop panel 501 is located above the space between the two second desktop panels 502, the handle 101 is rotated again. Under the action of the ascending and rotating hollow mechanism, the first desktop panel 501 descends and finally descends to the same horizontal plane as the second desktop panel 502. Before and after the deformation, the height of the first table top 501 is different. The height of the first table top 501 after becoming a round table is lower than that before the deformation. However, during this process, the turntable 507 is always supported by the support column 509. The lower end of the support column 509 is located on the upper end surface of the spiral guide groove base 400. When the first table top 501 falls back to the same horizontal plane as the second table top 502, the turntable 507 is exposed to a certain height from the first table top 501. Under the action of the turntable 508, the turntable 507 can flexibly rotate, thereby achieving the purpose of "the dining table becomes round and the turntable rotates", making dining convenient.

[0063] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A dining table with a changeable tabletop, characterized in that: The invention comprises a table top, table legs, a table frame and a hollow mechanism for rising and rotating, wherein the table top comprises a first table top and a second table top, wherein the second table top has two pieces, which are respectively located on both sides of the first table top and fixedly connected to the table legs; the first table top can do rising and rotating motions under the action of the hollow mechanism for rising and rotating, and the first table top and the second table top are combined to form a complete round table top; the table legs are at least three, and the second table top is fixed to the upper ends of the table legs; the table frame is fixed to the lower surface of the first table top, and comprises two fixing strips whose two ends are fixed to the lower surface of the first table top and are suspended in the middle, and the first table top is located above the hollow mechanism for rising and rotating; the hollow mechanism for rising and rotating is fixed to the two fixing strips of the table frame; The table frame also includes a strip connecting plate fixedly connected to four table legs, the four strip connecting plates enclose a square frame, and the table legs are located on the four legs of the square frame; a reinforcing block is provided at the table leg position to fixedly connect the two ends of two adjacent strip connecting plates; a load-bearing bar is provided between the strip connecting plates on the two long sides and the first table top; The hollow mechanism for ascending and rotating includes an outer lifting turntable, a lifting mechanism, a rotating device, and a spiral guide groove base, wherein the lifting mechanism is movably connected to the outer lifting turntable and the spiral guide groove base, the outer lifting turntable is used to push the rotating device upward, and is movably connected to the rotating device; the lifting mechanism directly acts on the outer lifting turntable to indirectly realize the lifting and lowering of the rotating device; the outer lifting turntable is located on one side of the spiral guide groove base; the rotating device includes an inner lifting turntable; the upper cylinder mouth of the outer lifting turntable extends outward to form an annular horizontal platform perpendicular to the vertical direction; a handle is also provided and fixedly connected to the outer lifting turntable; The lifting mechanism is provided with at least three groups of guide wheel assemblies, each group includes but is not limited to bearings, bolts, and nuts; the bolts are fixed on the cylinder wall of the outer lifting turntable, and the bearings are fixed on the bolts; at least three spiral guide grooves are provided on the cylinder wall of the spiral guide groove base, and the bearings are located in the spiral guide grooves, and the width of the spiral guide grooves is greater than the outer diameter of the bearings. By rotating the outer lifting turntable, the bearings move in the spiral guide grooves, and the spiral guide grooves are in the shape of long strips, and there is a certain height difference between the two ends of the spiral guide grooves in the vertical direction; the lifting height of the mechanism can be changed by changing the spiral angle and spiral length of the spiral guide grooves; the initial position of the bearing is located at the lowest point of the spiral guide grooves; the outer lifting turntable also rises together with the bearing, and after the bearing rises to the highest point of the spiral guide groove and sits on the bearing seat position at the upper end of the spiral guide groove, the outer lifting turntable pushes the rotating device to the highest point and is supported by the outer lifting turntable; the rotating device rotates, driving the first desktop panel to rotate.

2. A dining table with a changeable tabletop according to claim 1, characterized in that: A turntable is provided above the first desktop panel, and a turntable rail is provided below the turntable. The turntable rail is supported by at least three support columns, and the upper ends of the support columns are fixedly connected to the turntable rail by screws; the lower ends of the support columns are suspended in the air, not fixed, and supported by an ascending and rotating hollow mechanism; the turntable is in a pancake shape or a ring shape.

3. The dining table with a changeable tabletop according to claim 1, characterized in that: The spiral guide groove is in a "V" shape, and the initial position of the bearing is at the lowest point of the "V"-shaped spiral guide groove; or the spiral guide groove is in an inverted "V" shape, and the initial position of the bearing is at the highest point of the inverted "V"-shaped spiral guide groove; the external lifting turntable can also rotate left and right, and the different spiral angles of the two groove sides of the "V"-shaped spiral guide groove or / and the inverted "V"-shaped spiral guide groove may not be equal, and the spiral lengths of the two different groove sides may also not be equal.

4. The dining table with a changeable tabletop according to claim 1, characterized in that: The rotating device includes a first roller and an inner lifting turntable, and the upper cylinder opening of the inner lifting turntable extends outward to form an annular horizontal platform perpendicular to the vertical direction; The lower end surface of the annular horizontal platform of the inner lifting turntable is in direct contact with the outer lifting turntable and is used to support the inner lifting turntable; at least three rollers are embedded on the cylinder wall of the spiral guide groove base, and the first roller is in contact with the outer cylinder wall of the inner lifting turntable and is used to guide the rotation and rise of the inner lifting turntable.

5. The dining table with a changeable tabletop according to claim 4, characterized in that: A circular ring is provided between the horizontal surfaces where the inner lifting turntable contacts the outer lifting turntable, and the circular ring can be fixed on the outer lifting turntable or on the inner lifting turntable; the circular ring and the inner lifting turntable can be in sliding contact or in rolling contact, and when in rolling contact, at least three first balls or second rollers are evenly provided on the circumference of the circular ring, for rolling contact with the lower surface of the annular horizontal platform of the inner lifting turntable extension section.

6. The dining table with a changeable tabletop according to claim 1, characterized in that: The outer lifting turntable is in contact with the spiral guide groove base. The outer lifting turntable is located below the rotating device and is used to support the rotating device. At least three groups of first balls or second rollers or a combination of the two are evenly embedded on the circumference of the cylinder wall of the spiral guide groove base; the inner and outer sides of the first balls or the second rollers are respectively the inner lifting turntable and the cylinder top frame of the rotating device; the outer lifting turntable is divided into an upper and a lower part, the lower part is fixedly connected to the spiral guide groove base, and the upper part is in contact with the rotating device and is used to support the inner lifting turntable of the rotating device, and the upper and lower parts of the outer lifting turntable cylinder in the circumferential direction include at least three groups of lifting structures.

7. The dining table with a changeable tabletop according to claim 6, characterized in that: The lifting structure is divided into a concave and convex section and support sections located on the left and right sides of the concave and convex section; wherein, when the upper part of the outer lifting turntable is a convex section, the lower part corresponding to the convex section is a concave section; when the upper part of the outer lifting turntable is a concave section, the lower part corresponding to the concave section is a convex section, and the two are consistent with each other, and the left and right sides of the concave and convex section are support sections, and the support sections are located at the top end of the concave section and the bottom end of the convex section, and are used to support the inner lifting turntable lifted by the outer lifting turntable; each convex section of the outer lifting turntable has a tip, and the tip is in sliding contact or rolling contact with the end surface of the lower part of the outer lifting turntable during the rotation of the upper part of the outer lifting turntable.

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