Foldable tent

Abstract

The utility model discloses a foldable tent which comprises a tent body with a folded state and an unfolded state, the tent body comprises at least three supporting legs and foldable telescopic units, and the telescopic units are connected among the supporting legs; in the unfolded state, the multiple supporting legs are far away from one another, the telescopic unit is unfolded, the tent body is in the folded state, the multiple supporting legs get close to one another, and the telescopic unit is folded among the multiple supporting legs. The tent comprises a tent body and at least two supporting legs, each supporting leg is provided with a supporting part, when the tent body is in the folded state, the supporting parts directly or indirectly abut against one another, the at least two supporting parts are detachably connected, and the supporting parts are used for fixing the supporting legs and preventing relative displacement between the supporting legs. The foldable tent is prevented from being deformed, so that the foldable tent is prevented from being damaged in the transportation process.

Description

Technical Field

[0001] The utility model relates to a foldable tent. Background Art

[0002] Before transportation, most foldable tents often need to be folded first. However, due to the bumps and vibrations during transportation and the collisions with other goods, the tent is extremely likely to be deformed, and the rods will also be squeezed and collided with each other, thus damaging the tent. To avoid the above situation, some tents will be packed in a packaging box or a storage bag after folding. However, the packaging box or the storage bag will also be squeezed, thus affecting the tent inside the packaging box or the storage bag, and the risk of damage to the tent cannot be eliminated. Summary of the Invention

[0003] The purpose of the utility model is to provide a new foldable tent.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a foldable tent, including a tent body having a folded state and an unfolded state, the tent body includes:

[0005] At least three support legs,

[0006] A foldable telescopic unit, the telescopic unit is connected between the support legs;

[0007] In the unfolded state, the plurality of support legs are far away from each other, the telescopic unit is unfolded, and in the folded state of the tent body, the plurality of support legs are close to each other, and the telescopic unit is folded between the plurality of support legs;

[0008] Each of the support legs is respectively provided with a support portion. When the tent body is in the folded state, the support portions are in contact with each other, and at least two of the support portions are connected to each other. The support portion is used to fix the plurality of support legs and prevent relative displacement between the support legs.

[0009] In some embodiments, at least two of the support legs are provided with wheel assemblies. The wheel assembly includes a wheel seat provided on the support leg and a wheel body rotatably provided on the wheel seat. In the folded state, the wheel body is located outside the support leg. When the foldable tent is inclined to the ground, the wheel body can support on the ground and can roll on the ground. The support portions provided on the support legs having the wheel assemblies are fixedly connected to each other. Through the fixed connection of the support portions, the deformation of the tent body is avoided when the foldable tent is moved by using the wheel assemblies.

[0010] In some embodiments, a receiving space is formed between the upper part of the supporting portion and the supporting leg, the wheel seat is rotatably connected to the supporting leg, when the tent body is in the folded state, the wheel assembly has a first position and a second position, when the wheel assembly is in the first position, the wheel body is received in the receiving space; when the wheel assembly is in the second position, the wheel body is located outside the supporting leg.

[0011] In some embodiments, a foot for supporting on the ground is provided at the lower end of the supporting leg, and a part of the foot extends laterally to form the supporting portion.

[0012] In some embodiments, the tent body includes four of the supporting legs, and the supporting portions on two adjacent supporting legs abut against each other, and the two adjacent supporting portions are fixedly connected.

[0013] In some embodiments, a positioning protrusion protruding laterally is provided on one of two adjacent supporting portions, and a positioning groove is provided on the other supporting portion. When the foldable tent is in the folded state, the positioning protrusion is inserted into the positioning groove. The mutual abutment of the supporting portions is realized by the cooperation of the positioning protrusion and the positioning groove.

[0014] In some embodiments, a first connection hole is provided on one of two adjacent supporting portions, and a second connection hole is provided on the other supporting portion. The foldable tent further includes a connecting member. When the tent body is in the folded state, the first connection hole and the second connection hole communicate with each other, and the connecting member is inserted into the first connection hole and at the same time inserted into the second connection hole, so that the two supporting portions are connected to each other.

[0015] In some embodiments, a first connection ring is provided on one of two adjacent supporting portions, and a second connection ring is provided on the other supporting portion. The first connection ring has the first connection hole penetrating along a first direction, and there are two first connection rings arranged at intervals along the first direction, the first direction is perpendicular to the axial direction of the supporting leg, and the second connection ring has the second connection hole penetrating along the first direction; when the tent body is in the folded state, the second connection ring is inserted between the two first connection rings, and the connecting member is inserted into the first connection ring and the second connection ring along the first direction.

[0016] In some embodiments, the supporting portion is arranged at the lower part of the supporting leg, and the foldable tent further includes a protective cover, which is used to cover the top of the foldable tent when the tent body is in the folded state, and the protective cover extends downward locally from the top of the foldable tent. The protective cover and the supporting portion jointly maintain the folded state of the tent body.

[0017] In some embodiments, the tent body includes four of the support legs, the support portion is L-shaped, and when the tent body is in the folded state, the outer sides of the four support portions are smoothly joined; the projection profiles of the four support portions on a horizontal plane are rectangular.

[0018] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art: For the foldable tent of the present utility model, when the tent body is in the folded state, through the mutual cooperation between the support portions on each support leg, the mutual fixation of each support leg is achieved, preventing mutual displacement between the support legs, avoiding deformation of the tent body during transportation, and avoiding extrusion or collision between the components of the foldable tent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG Figure 1 is a perspective structural view of a foldable tent according to a specific embodiment of the present utility model in a folded state;

[0020] FIG Figure 2 is a perspective view of the middle support leg in FIG Figure 1 ;

[0021] FIG Figure 3 is an exploded view of FIG Figure 2 ;

[0022] FIG Figure 4 is a schematic view of a partial structure in FIG Figure 1 , in which the upper part of the support leg is omitted;

[0023] FIG Figure 5 is an enlarged view of part A in FIG Figure 4 ;

[0024] FIG Figure 6 is a schematic view from another perspective in FIG Figure 4 ;

[0025] FIG Figure 7 is a schematic view when the wheel assembly is in the second position in FIG Figure 4 ;

[0026] FIG Figure 8 is an exploded view of the wheel assembly according to a specific embodiment of the present utility model;

[0027] FIG Figure 9 is a schematic view of the elastic member and the locking member according to a specific embodiment of the present utility model;

[0028] FIG Figure 10 is a schematic view when the locking mechanism is in the locked state in this embodiment;

[0029] FIG Figure 11Schematic diagram of the unlocking process of the locking mechanism in this embodiment;

[0030] Wherein: 100, tent body; 110, support leg; 111, first lock hole; 112, limiting member; 113, hollow cavity; 120, telescopic unit;

[0031] 200, support part; 210, positioning protrusion; 220, positioning groove; 230, first connecting ring; 240, second connecting ring;

[0032] 300, foot; 400, connecting member;

[0033] 500, wheel assembly; 510, wheel seat; 511, second lock hole; 512, arc-shaped guide groove; 520, wheel body;

[0034] 600, unlocking member; 601, rotating shaft; 610, connecting part; 620, pressing part; 630, protruding part;

[0035] 700, locking member; 800, elastic member. Detailed implementation manners

[0036] The technical solutions of the present invention will be elaborated in detail below in conjunction with the accompanying drawings and specific embodiments, so that the advantages and features of the present invention are more easily understood by those skilled in the art. Obviously, the described embodiments of the present application are only a part of the embodiments of the present application, rather than all embodiments. All other embodiments obtained by those skilled in the art without creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0037] Refer to Figure 1 A foldable tent shown, which includes a tent body 100 having a folded state and an unfolded state. The tent body 100 includes a foldable telescopic unit 120 and at least three support legs 110. The telescopic unit 120 is connected between the support legs. When the tent body 100 is in the unfolded state, the plurality of support legs 110 are separated from each other, and the telescopic unit unfolds. When the tent body 100 is in the folded state, the plurality of support legs 110 are close to each other, and the telescopic unit 120 is folded between the plurality of support legs 110.

[0038] Each support leg 110 is respectively provided with a support part 200. When the tent body 100 is in the folded state, the support parts 200 directly or indirectly abut against each other, and at least two support parts 200 are connected to each other. Specifically, at least two support parts 200 are fixedly connected. Through the mutual cooperation between the support parts 200, the mutual fixation of the plurality of support legs 110 can be realized, thereby preventing relative displacement between the support legs 110 and ensuring that the tent body 100 does not deform during transportation.

[0039] In this embodiment, the tent body 100 includes four support legs 110. When the tent body 100 is in a folded state, the four support legs 110 are close to each other, and the four support legs 110 are distributed at the four vertices of a rectangle. In some preferred embodiments, the support portion 200 on each support leg 110 extends toward two adjacent support legs 110, and the two extension directions are perpendicular to each other. In this embodiment, the support portion 200 is L-shaped. When the tent body 100 is in a folded state, the outer sides of the four support portions 200 are smoothly connected, and the projection contours of the four support portions 200 on the horizontal plane are rectangular. The tent body 100 after folding in this way can maintain the shape of a rectangular parallelepiped, which is regular in shape and easy to store and organize.

[0040] In this embodiment, the support portion 200 is disposed at the lower portion of the support leg 110. Specifically, the lower end portion of the support leg 110 is provided with a support foot 300 for supporting the ground, and a portion of the support foot 300 extends laterally to form the support portion 200, and the support portions 200 on two adjacent support legs 110 abut against or are connected to each other. Specifically, see Figure 2 , Figure 3 As shown, two side portions of the support leg 300 extend toward two adjacent support legs 110, respectively, thereby forming a support portion 200. When the tent body 100 is in a folded state, the outer contours of all the support legs 300 and the support portion 200 are square.

[0041] In this embodiment, one of the two adjacent support parts 200 is provided with a laterally protruding positioning protrusion 210, and the other support part 200 is provided with a positioning groove 220. When the foldable tent is in a folded state, the positioning protrusion 210 is inserted into the positioning groove 220, and the mutual abutment between the two adjacent support parts 200 is achieved through the cooperation between the positioning protrusion 210 and the positioning groove 220.

[0042] In this embodiment, one of the two adjacent support parts 200 is provided with a first connection hole, and the other support part 200 is provided with a second connection hole. The foldable tent further includes a connector 400. When the tent body 100 is in a folded state, the first connection hole and the second connection hole are interconnected, and the connector 400 is inserted into the first connection hole and the second connection hole at the same time, so as to realize the mutual connection of the two support parts 200. Specifically, when the tent body 100 is in a folded state, the first connection hole and the second connection hole are interconnected along a first direction, and the connector 400 is inserted into the first connection hole and the second connection hole at the same time along the first direction, and the first direction is perpendicular to the extension direction of the support leg 110.

[0043] In this embodiment, a first connecting ring 230 is provided on one side of one of the support parts 200. The first connecting ring 230 has a first connecting hole penetrating along a first direction, and there are two first connecting rings 230 arranged at intervals along the first direction. A second connecting ring 240 is provided on another support part 200 adjacent to the support part 200 provided with the first connecting ring 230. The second connecting ring 240 has a second connecting hole penetrating along the first direction. When the tent body 100 is in a folded state, the second connecting ring 240 is inserted between the two first connecting rings 230, so that the two first connecting holes communicate with the second connecting hole, and the connecting member 400 is inserted into the first connecting ring 230 and the second connecting ring 240. Through the cooperation among the first connecting ring 230, the second connecting ring 240 and the connecting member 400, the relative displacement of the two support parts 200 is restricted, and the mutual fixation of the two support parts 200 is realized.

[0044] In other embodiments, the plurality of support parts 200 are detachably connected through a buckle structure. In some other embodiments, the plurality of support parts 200 are connected by using other structures capable of realizing detachable connection in the prior art.

[0045] In this embodiment, the foldable tent further includes a protective cover (not shown in the figure). The protective cover is used to cover the top of the foldable tent when the tent body 100 is in a folded state, and the protective cover extends partially downward from the top of the foldable tent. The protective cover can play a role in fixing the foldable tent. It can prevent the tent body 100 from unfolding outward. Under the combined action of the protective cover and the support part 200, the foldable tent can stably maintain its shape, prevent the foldable tent from deforming, and thus avoid mutual collision and extrusion among the components during transportation. In other embodiments, in the folded state, the tent body 100 is fixed by using other fixing structures or fixing methods in the prior art, and combined with the common action of the support part 200, the tent body 100 is maintained in the folded state.

[0046] In some embodiments, at least two support legs 110 are provided with wheel assemblies 500. The wheel assemblies 500 include wheel seats 510 and wheel bodies 520. Among them, the wheel seats 510 are arranged on the support legs 110, and the wheel bodies 520 are rotatably connected to the wheel seats 510. When the tent body is in a folded state, the wheel bodies 520 are located outside the support legs 110. By tilting the foldable tent with respect to the ground, the wheel bodies 520 can support on the ground and can roll on the ground. Thus, the user can use the wheel assemblies 500 on the support legs 110 to drive the foldable tent to move. In this way, there is no need to prepare a transport bag with wheels, nor to spend energy loading the foldable tent into the transport bag. The foldable tent can be directly transferred by using the wheel assemblies 500 on the support legs 110, which provides convenience for the user.

[0047] In this embodiment, the supporting parts 200 provided on the supporting legs 110 with the wheel assemblies 500 are fixedly connected to each other, preventing relative displacement in the direction between the supporting legs 110 with the wheel assemblies 500 during the process of moving the foldable tent, improving the stability of the foldable tent, and ensuring its normal transfer. In this embodiment, there are a total of four supporting legs 110, and two adjacent supporting legs 110 are provided with wheel assemblies 500. In the folded state, the two supporting legs 110 provided with wheel assemblies 500 are fixedly connected together through the supporting parts 200.

[0048] In this embodiment, the wheel seat 510 is rotatably connected to the lower end of the supporting leg 110. Specifically, the wheel seat 510 is sleeved on the supporting leg 110, and the wheel seat 510 can rotate around the supporting leg 110. When the tent body 100 is in the folded state, the wheel assembly 500 has at least a first position and a second position. Refer to Figure 2 、 Figure 4 As shown, when the wheel assembly 500 is in the first position, the wheel assembly 500 is received between the plurality of supporting legs 110, facilitating the storage and arrangement of the tent. When the wheel assembly 500 is in the second position, the wheel assembly 500 extends to the outside of the supporting leg 110.

[0049] In this embodiment, a locking mechanism is provided between the supporting leg 110 and the wheel seat 510 for locking the wheel assembly 500 in the first position and the second position. In this embodiment, an unlocking member 600 is provided on the wheel seat 510, and the unlocking member 600 can be arranged relatively far away from or close to the wheel seat 510. When the unlocking member 600 is relatively close to the wheel seat 510, it can drive the locking mechanism to unlock. When the user is using, by pressing the unlocking member 600, the locking of the wheel assembly 500 can be released, so that the wheel assembly 500 can be driven to be adjusted between the first position and the second position.

[0050] In this embodiment, the locking structure includes a locking member 700 movably arranged on the supporting leg 110 or the wheel seat 510, a first lock hole 111 arranged on the side wall of the supporting leg 110, and a second lock hole 511 arranged on the wheel seat 510. When the wheel assembly 500 is in the first position and the second position, the first lock hole 111 and the second lock hole 511 communicate with each other, and the locking member 700 is inserted into the first lock hole 111 and simultaneously inserted into the second lock hole 511, and the locking mechanism is in the locked state. When the locking mechanism is in the unlocked state, the locking member 700 withdraws from the second lock hole 511, and the wheel seat 510 can rotate relative to the supporting leg 110. Specifically, refer to Figure 10 As shown, the lower part of the supporting leg 110 has a hollow cavity 113, and the locking member 700 is movably arranged in the hollow cavity 113, and the first lock hole 111 communicates with the hollow cavity 113.

[0051] In this embodiment, the locking mechanism further includes an elastic member 800, which is used to provide a force for the locking member 700 to extend out of the first locking hole 111 and into the hollow cavity 113. When the wheel assembly 500 is switched to the first position or the second position, under the action of the elastic member 800, the locking member 700 automatically extends out of the first locking hole 111 and inserts into the second locking hole 511, so that the locking mechanism is automatically switched to the locked state. At the same time, under the action of the elastic member 800, the locking mechanism can be maintained in the locked state.

[0052] In this embodiment, when the unlocking member 600 is relatively close to the support leg 110, it can drive the locking member 700 to withdraw from the second locking hole 511, thereby unlocking the locking mechanism. In this embodiment, refer to Figure 5 、 Figure 8 As shown in, the unlocking member 600 has a connecting portion 610 and a pressing portion 620 disposed on different sides of itself. The connecting portion 610 is rotatably connected to the wheel seat 510, and the pressing portion 620 blocks the second locking hole 511. Specifically, refer to Figure 8 As described, the connecting portion 610 is located above the pressing portion 620. The connecting portion 610 is rotatably connected to the wheel seat 510 through a rotating shaft 601. The extending direction of the axis of the rotating shaft 601 is perpendicular to the axial direction of the support leg 110. Refer to Figure 10 As shown in, the side of the pressing portion 620 close to the wheel seat 510 has a protruding portion 630 extending toward the second locking hole 511. When the locking mechanism is in the locked state, the protruding portion 630 abuts against the locking member 700. Refer to Figure 11 As shown in, by driving the pressing portion 620 to approach the wheel seat 510, the protruding portion 630 also approaches the second locking hole 511 and pushes the locking member 700 to move into the hollow cavity 113, so that the locking member 700 disengages from the second locking hole 511.

[0053] In this embodiment, refer to Figure 6 、 Figure 7 As shown in, two first locking holes 111 are provided on the support leg 110, and two corresponding second locking holes 511 are provided on the wheel seat 510. Specifically, the two first locking holes 111 are oppositely arranged along a straight line direction, and the two second locking holes 511 are also oppositely arranged along a straight line direction. When the wheel assembly 500 is in the first position and the second position, the two first locking holes 111 are respectively communicated with the two second locking holes 511, and in the first position and the second position, the second locking hole 511 corresponding to any one of the first locking holes 111 is different. In this embodiment, refer to Figure 9As shown, the elastic member 800 is a V-shaped elastic sheet. The two free ends of the elastic sheet are fixedly provided with protrusions protruding outward, and the protrusions form the locking members 700. The two protrusions are respectively inserted into the two first locking holes 111. When the wheel assembly 500 is in the first position and the second position, driven by the acting force of the two free ends of the elastic sheet spreading outward, the two protrusions extend out of the first locking holes 111 and extend into the second locking holes 511. The provision of the two locking members 700 makes the locking between the wheel seat 510 and the support leg 110 more firm.

[0054] In this embodiment, two unlocking members 600 are provided on each wheel seat 510. By pressing the two unlocking members 600 simultaneously, the two free ends of the elastic sheet are relatively close to each other, so that the two protrusions respectively withdraw from the two second locking holes 511, and unlocking can be achieved. The unlocking operation is simple.

[0055] In this embodiment, wheel assemblies 500 are provided on two adjacent support legs 110, and wheel assemblies 500 are not provided on the other two support legs 110. A limiting mechanism is provided between the wheel assembly 500 and the support leg 110. The limiting mechanism is used to limit the rotation direction of the wheel assembly 500. Specifically, the limiting mechanism is used to prevent the wheel assembly 500 from rotating between the two support legs 110 provided with the wheel assemblies 500, so as to avoid interference between the two wheel assemblies 500. The limiting mechanism includes a guiding member provided on one of the wheel seat 510 and the support leg 110, and a limiting member 112 provided on the other of them. When the wheel assembly 500 is in the first position and the second position, the limiting member 112 abuts against one side of the guiding member, thereby limiting the relative movement direction of the two.

[0056] In this embodiment, refer to Figure 5 As shown, the limiting member 112 protrudes outward from the outer side wall of the support leg 110. An arc-shaped guiding groove 512 extending along the circumferential direction of itself is provided on the wheel seat 510. The arc-shaped guiding groove 512 constitutes the above-mentioned guiding member, and the limiting member 112 is inserted into the arc-shaped guiding groove 512. The cooperation between the arc-shaped guiding groove 512 and the limiting member 112 provides guidance for the rotation of the wheel seat 510. At the same time, when the wheel assembly 500 is in the first position and the second position, the limiting member 112 abuts against the side wall of the arc-shaped guiding groove 512, restricting the displacement of the wheel seat 510 relative to the support leg 110.

[0057] In this embodiment, when the tent main body 100 is in a folded state, a receiving space is formed between the upper part of the support portion 200 and the support leg 110. When the wheel assembly 500 is in the first position, the wheel assembly 500 is received in the receiving space, which can avoid interference of the wheel body 520 on the support leg 110 or the telescopic unit 120.

[0058] In summary, for the collapsible tent of this embodiment, when the tent body 100 is in a folded state, the supporting parts 200 on each supporting leg 110 are in mutual abutment, and the two supporting parts 200 are connected together by a connecting member 400, and the supporting parts 200 become an integral body, so that the supporting legs 110 are fixed to each other, preventing relative displacement between the supporting legs 110, thereby preventing the collapsible tent from deforming and preventing extrusion or collision between the components.

[0059] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and shall not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A collapsible tent, comprising a tent body having a folded state and an unfolded state, the tent body including: At least three support legs, A collapsible telescopic unit connected between the support legs; In the unfolded state, the plurality of support legs are spaced apart from each other, and the telescopic unit is unfolded. In the folded state of the tent body, the plurality of support legs are close to each other, and the telescopic unit is folded between the plurality of support legs; It is characterized in that: support portions are respectively provided on each of the support legs. When the tent body is in the folded state, the support portions abut against each other, and at least two of the support portions are connected to each other. The support portions are used to fix the plurality of support legs and prevent relative displacement between the support legs.

2. The collapsible tent according to claim 1, wherein: At least two of the support legs are provided with wheel assemblies. The wheel assemblies include wheel seats provided on the support legs and wheel bodies rotatably provided on the wheel seats. In the folded state, the wheel bodies are located outside the support legs. When the collapsible tent is inclined to the ground, the wheel bodies can support on the ground and roll on the ground. The support portions provided on the support legs having the wheel assemblies are fixedly connected to each other.

3. The foldable tent according to claim 2, wherein: An accommodation space is formed between the upper portion of the support portion and the support leg. The wheel seat is rotatably connected to the support leg. When the tent body is in the folded state, the wheel assembly has a first position and a second position. When the wheel assembly is in the first position, the wheel body is received in the accommodation space; when the wheel assembly is in the second position, the wheel body is located outside the support leg.

4. The collapsible tent according to claim 1, wherein: The lower end of the support leg is provided with a foot for supporting on the ground, and a part of the foot extends laterally to form the support portion.

5. The collapsible tent according to claim 4, wherein: The tent body includes four support legs, and the support portions on two adjacent support legs abut against each other, and two adjacent support portions are fixedly connected.

6. The collapsible tent according to claim 1, wherein: One of two adjacent support portions is provided with a laterally protruding positioning protrusion, and the other support portion is provided with a positioning groove. When the collapsible tent is in the folded state, the positioning protrusion is inserted into the positioning groove.

7. The foldable tent according to claim 1, characterized in that: One of two adjacent support portions is provided with a first connection hole, and the other support portion is provided with a second connection hole. The collapsible tent further includes a connecting member. When the tent body is in the folded state, the first connection hole and the second connection hole are communicated with each other, and the connecting member is inserted into the first connection hole and at the same time inserted into the second connection hole, so that the two support portions are connected to each other.

8. The collapsible tent according to claim 7, wherein: One of the two adjacent support parts is provided with a first connecting ring, and the other support part is provided with a second connecting ring. The first connecting ring has the first connecting hole penetrating along a first direction, and there are two first connecting rings arranged at intervals along the first direction. The first direction is perpendicular to the axial direction of the support leg. The second connecting ring has the second connecting hole penetrating along the first direction; when the tent body is in the folded state, the second connecting ring is inserted between the two first connecting rings, and the connecting piece is inserted between the first connecting ring and the second connecting ring along the first direction.

9. The foldable tent according to claim 1, characterized in that: The support part is arranged at the lower part of the support leg. The foldable tent further includes a protective cover for covering the top of the foldable tent when the tent body is in the folded state. The protective cover extends downward locally from the top of the foldable tent.

10. The collapsible tent according to claim 1, characterized in that: The tent body includes four support legs. The support part is L-shaped. When the tent body is in the folded state, the outer sides of the four support parts are smoothly connected; the projection profiles of the four support parts on the horizontal plane are rectangular.

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