Quilt cover with openings on two sides

Abstract

The quilt cover comprises a top face and a bottom face, the top face is formed by sequentially connecting a first top edge, a second top edge, a third top edge and a third top edge, the first top edge, the second top edge, the third top edge and the third top edge are connected in sequence, a top face arc-shaped section is arranged at the joint of the two movable edges, and a top face zipper strip is arranged along the two movable edges; and the bottom surface structure is symmetrically provided with a bottom surface fixed edge, a movable edge, an arc-shaped section and a bottom surface zipper strip. The first top edge and the fourth top edge are connected with the corresponding bottom edges respectively, the top-bottom face fixed edges are correspondingly connected, the top-bottom face movable edges jointly form an L-shaped opening, the top-bottom face zipper strips form an L-shaped zipper pair, and at least one zipper head is arranged on the L-shaped zipper pair. According to the design, the fixed edge and the movable edge are divided, the L-shaped zipper pair is matched with the zipper head, two-way flexible opening and closing of the L-shaped opening are achieved, a user can control the opening degree according to requirements, the quilt cover has flexibility of local opening and high efficiency of overall opening and closing, and the using convenience and functionality of the quilt cover are improved.

Description

Technical Field

[0001] This utility model relates to a duvet cover, belonging to the field of home textiles, and particularly to a duvet cover with double openings. Background Technology

[0002] Currently, most duvet covers on the market use the traditional single-sided opening design, with only one opening on one side for inserting or removing the duvet insert. In actual use, when users try to insert the duvet insert, they often need to gradually align the corners of the duvet insert with the cover from this single opening. Due to the limited opening area, the diagonal corners of the duvet insert are prone to folding or misalignment, making the entire insertion process cumbersome and time-consuming. After the duvet insert is inserted, if it shifts or wrinkles during subsequent daily use, the user can only reach in through this single opening to adjust it. The single-sided opening design limits the adjustment space, making adjustments difficult, especially for users with less strength, such as women. Therefore, this traditional single-sided opening design increases the difficulty of daily use.

[0003] Chinese patent application CN202021961399.7, filed on September 9, 2020, discloses a duvet cover, which includes a duvet cover body and a positioning structure. One end of the duvet cover body has an opening that can be opened and closed by a zipper. The positioning structure includes a first positioning strip and a second positioning strip. The first positioning strip is fixed to the side of the duvet cover body near its length and is continuous with the body. The second positioning strip is fixed to the side of the duvet cover body near its width and is continuous with the width of the body. Although this design offers some convenience in positioning and laying the duvet, it still has the following drawbacks:

[0004] The design uses a traditional single-sided opening, which will increase the difficulty of daily use.

[0005] The information disclosed in this background section is intended only to enhance understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to overcome the problem that existing duvet covers with a single-sided opening design increase the difficulty of daily use, and to provide a duvet cover with a double-sided opening design that reduces the difficulty of daily use.

[0007] To achieve the above objectives, the technical solution of this utility model is:

[0008] A duvet cover with double openings, the duvet cover comprising a top surface and a bottom surface;

[0009] The top surface includes a first top edge, a second top edge, a third top edge, and a fourth top edge connected in sequence. The portion of the second top edge near the junction of the first and second top edges is the first fixed edge of the top surface, and the remaining portion of the second top edge is the first movable edge of the top surface. The portion of the third top edge near the junction of the third and fourth top edges is the second fixed edge of the top surface, and the remaining portion of the third top edge is the second movable edge of the top surface. The lengths of both the first and second fixed edges of the top surface are greater than or equal to zero. The junction of the first and second movable edges of the top surface is an arc-shaped segment of the top surface, and the same top surface zipper strip is provided along the first and second movable edges of the top surface.

[0010] The bottom surface includes a first bottom edge, a second bottom edge, a third bottom edge, and a fourth bottom edge connected in sequence. The portion of the second bottom edge near the junction of the first and second bottom edges is the first fixed edge of the bottom surface, and the remaining portion of the second bottom edge is the first movable edge of the bottom surface. The portion of the third bottom edge near the junction of the third and fourth bottom edges is the second fixed edge of the bottom surface, and the remaining portion of the third bottom edge is the second movable edge of the bottom surface. The lengths of both the first and second fixed edges of the bottom surface are greater than or equal to zero. The junction of the first and second movable edges of the bottom surface is an arc-shaped segment of the bottom surface, and the same bottom surface zipper strip is provided along the first and second movable edges of the bottom surface.

[0011] The first top edge is connected to the first bottom edge, the fourth top edge is connected to the fourth bottom edge, the first fixed edge of the top surface is connected to the first fixed edge of the bottom surface, and the second fixed edge of the top surface is connected to the second fixed edge of the bottom surface. The first movable edge of the top surface, the second movable edge of the top surface, the first movable edge of the bottom surface, and the second movable edge of the bottom surface together form an L-shaped opening. The top zipper strip and the bottom zipper strip together form an L-shaped zipper pair. At least one zipper head that slides relative to it is provided on the L-shaped zipper pair.

[0012] The radius of the chamfered corners on the top and bottom arc segments ranges from 1.5mm to 20mm.

[0013] The radius of the curved chamfer is 10mm.

[0014] Both the top and bottom arc-shaped segments are thickened structures. The thickness of the top arc-shaped segment is greater than the thickness of the remaining parts of the first and second movable edges of the top surface, excluding the top arc-shaped segment. The thickness of the bottom arc-shaped segment is greater than the thickness of the remaining parts of the first and second movable edges of the bottom surface, excluding the bottom arc-shaped segment.

[0015] The thickened structure is a triangular or triangular rigid support structure, which is sewn onto the outer or inner side of the top arc segment and the bottom arc segment.

[0016] The thickened structure is an L-shaped or L-shaped elastic support sheet, which is sewn onto the inner side of the top arc segment and the bottom arc segment.

[0017] The thickened structure is an L-shaped or L-shaped soft support structure, which is composed of stacked fabric at the top arc section and the bottom arc section.

[0018] The number of zipper heads is two, and the two zipper heads together with the L-shaped zipper pair form a two-way zipper.

[0019] The bidirectional zipper can be any one of the following: invisible double-headed zipper, closed-end double-headed zipper, open-end double-headed zipper, or double-headed double-opening zipper.

[0020] The lengths of the first fixed edge of the top surface, the second fixed edge of the top surface, the first fixed edge of the bottom surface, and the second fixed edge of the bottom surface are all greater than zero.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. In a double-opening duvet cover of this utility model, the duvet cover includes a top surface and a bottom surface, both of which are composed of four sides connected in sequence. The second and third sides of the top and bottom surfaces are partially fixed sides, and the remaining parts are movable sides. The junction of the movable sides is an arc segment and a zipper is provided along the movable side. The first top edge and the first bottom edge, the fourth top edge and the fourth bottom edge, the first fixed edge of the top surface and the first fixed edge of the bottom surface, and the second fixed edge of the top surface and the second fixed edge of the bottom surface are respectively connected. The movable sides of the top and bottom surfaces and the zipper together form an L-shaped opening and an L-shaped zipper assembly. The L-shaped zipper assembly is provided with at least one slidable zipper head to control the opening and closing of the L-shaped opening. When using the duvet cover, first lay it flat on the bed with the top and bottom edges at the head of the bed and the third top and bottom edges at the foot of the bed. Then, pull the zipper to open the L-shaped opening. Next, lift the top of the duvet cover and tuck two corners from the same side of the duvet cover into the first and third corners, respectively. Then, tuck the remaining two corners of the duvet cover into the remaining two corners. Gently adjust the duvet cover to ensure it is completely flat and smooth inside. Finally, pull the zipper to close the L-shaped opening. If the duvet cover slips or becomes misaligned and needs adjustment, proceed as follows: Pulling the zipper pull partially or fully opens the top and bottom zipper strips, allowing you to reach into the opening and directly grasp the comforter insert, moving it to the desired position. Traditional single-sided opening comforter covers often require repeated folding and alignment of the comforter insert before insertion, a cumbersome process. This design, with its L-shaped opening, provides more space and a more convenient angle, allowing the comforter insert to be naturally inserted and unfolded without complicated folding steps. Users can easily reach in and directly grasp different parts of the comforter insert, quickly and accurately moving it to the appropriate position, improving adjustment efficiency. Therefore, this invention offers convenient operation for filling and subsequently adjusting the comforter insert, facilitating daily use.

[0023] 2. In the double-sided opening duvet cover of this utility model, both the top arc-shaped section and the bottom arc-shaped section are provided with arc-shaped chamfers. In application, the rounded chamfers on the top and bottom curved sections, through a smooth transition design, provide a smooth turning trajectory for the zipper head when passing through the L-shaped opening corner, compared to traditional right-angle openings. Furthermore, when the zipper head slides to the L-shaped opening corner, the rounded chamfer reduces rigid collisions between the zipper head and the edge of the cover, lowering the risk of jamming or tooth jamming caused by right-angled edges. This allows the force on the zipper head to be evenly distributed over the curved area, thus avoiding fabric tearing or zipper damage caused by localized stress concentration, achieving smooth sliding of the zipper head when passing through the L-shaped opening corner. In actual use, the radius of the rounded chamfers on the top and bottom curved sections is preferably between 1.5mm and 20mm. This range ensures that the rounded chamfers have sufficient curvature to form a smooth turning guide trajectory, avoiding residual edge effects due to excessively small radii, while also preventing fabric redundancy in the opening area or decreased zipper stability due to excessively large radii. It is also compatible with the size specifications and mechanical performance requirements of mainstream zipper heads. Therefore, this utility model uses an arc-shaped chamfer design to enable the zipper head to slide smoothly when passing through an L-shaped opening corner, reducing the risk of jamming and tearing.

[0024] 3. In this utility model of a double-opening duvet cover, both the top and bottom curved sections are thickened. The thickness of the top curved section is greater than the thickness of the remaining parts of the first and second movable edges of the top surface, excluding the top curved section. Similarly, the thickness of the bottom curved section is greater than the thickness of the remaining parts of the first and second movable edges of the bottom surface, excluding the bottom curved section. In application, when the user unzips the L-shaped zipper to insert or remove the duvet insert, the top and bottom curved sections, as high-frequency stress areas at the corners of the L-shaped opening, bear the concentrated stress generated by the zipper head turning and the fabric stretching. This evenly distributes the tension to the fabric fibers or supporting frame in the curved area, preventing tearing caused by excessive stretching of ordinary thickness fabric. Simultaneously, the thickened structure provides a stable sliding track for the zipper head, reducing jamming at corners caused by soft fabric due to rigid or elastic support. Therefore, the thickened structure in this invention can reduce the risk of fabric tearing at the corner of the L-shaped opening and provide a stable sliding track for the zipper head.

[0025] 4. In this utility model, a double-opening duvet cover features two zipper pulls, which, together with an L-shaped zipper attachment, form a two-way zipper. In use, the two independent zipper pulls and the L-shaped zipper attachment work together. Users can choose to pull one zipper pull individually to open a partial opening, or simultaneously pull both zipper pulls. For example, when both zipper pulls are at the corners of the L-shaped opening, simply pull towards both ends of the L-shaped opening to quickly and fully open it. When tidying the duvet cover, adjusting one zipper pull can open a specific area and easily smooth out internal wrinkles. Compared to the traditional single-zipper pull operation, which requires pulling in one direction from beginning to end, the two-way zipper is more efficient at opening and closing the L-shaped opening and offers greater flexibility and convenience. Therefore, the two-way zipper in this utility model improves the efficiency of opening and closing L-shaped openings and offers flexible and convenient operation.

[0026] 5. In this utility model of a double-opening duvet cover, the lengths of the first fixed edge on the top surface, the second fixed edge on the top surface, the first fixed edge on the bottom surface, and the second fixed edge on the bottom surface are all greater than zero. In application, the greater-than-zero lengths of the fixed edges on the top and bottom surfaces create a "limiting and fixing segment" in the non-opening area of ​​the duvet cover edge. When putting on the duvet cover, this helps the duvet insert to be inserted into the corresponding corner of the duvet cover, and the limiting effect of the fixed edges restricts the movement of the duvet insert. Even if the L-shaped opening is open, the fixed edges still restrict the position of the duvet insert inside the duvet cover, preventing the duvet insert from shifting or its corners from being exposed due to actions such as turning over or pulling. Therefore, in this utility model, the fixed edges on the top and bottom surfaces facilitate the insertion of the duvet insert and also serve to secure it. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] Figure 2 yes Figure 1 A schematic diagram of the structure of the second top edge and the second bottom edge.

[0029] Figure 3 yes Figure 1 A schematic diagram of the structure of the third top edge and the third bottom edge.

[0030] Figure 4 This is an exploded view of the structure of this utility model.

[0031] Figure 5 yes Figure 1 A schematic diagram illustrating the application of a two-way zipper.

[0032] Figure 6 yes Figure 1 A schematic diagram of the structure when the arc-shaped section of the bottom surface has no thickening structure.

[0033] Figure 7 yes Figure 6A schematic diagram of the structure when the thickened structure at the arc-shaped section of the bottom surface is an L-shaped elastic support piece.

[0034] Figure 8 yes Figure 6 A schematic diagram of the structure when the thickened structure at the arc-shaped section of the bottom surface is a triangular rigid support structure.

[0035] Figure 9 yes Figure 6 A schematic diagram of the structure when the thickened structure at the arc section of the bottom surface is an L-shaped soft support structure.

[0036] Figure 10 This is a schematic diagram of the fixing ring set at the corner of the cover in this utility model.

[0037] In the diagram: Top surface 1, First top edge 11, Second top edge 12, First fixed edge of top surface 121, First movable edge of top surface 122, Third top edge 13, Second fixed edge of top surface 131, Second movable edge of top surface 132, Fourth top edge 14, Top surface arc segment 15, Top surface zipper 16, Bottom surface 2, First bottom edge 21, Second bottom edge 22, First fixed edge of bottom surface 221, First movable edge of bottom surface 222, Third bottom edge 23, Second fixed edge 231, Second movable edge of bottom surface 232, Fourth bottom edge 24, Bottom surface arc segment 25, Bottom surface zipper 26, Zipper head 30, Thickened structure 40, Fixing ring 50, First corner of duvet cover 60, Second corner of duvet cover 70, Third corner of duvet cover 80. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] See Figure 1 — Figure 10 A double-sided opening duvet cover, the duvet cover comprising a top surface 1 and a bottom surface 2;

[0040] The top surface 1 includes a first top edge 11, a second top edge 12, a third top edge 13, and a fourth top edge 14 connected in sequence. The portion of the second top edge 12 near the junction of the first top edge 11 and the second top edge 12 is the first fixed edge 121 of the top surface, and the remaining portion of the second top edge 12 is the first movable edge 122 of the top surface. The portion of the third top edge 13 near the junction of the third top edge 13 and the fourth top edge 14 is the second fixed edge 131 of the top surface, and the remaining portion of the third top edge 13 is the second movable edge 132 of the top surface. The lengths of the first fixed edge 121 and the second fixed edge 131 of the top surface are both greater than or equal to zero. The junction of the first movable edge 122 and the second movable edge 132 of the top surface is the top surface arc segment 15, and the same top surface zipper strip 16 is provided along the first movable edge 122 and the second movable edge 132 of the top surface.

[0041] The bottom surface 2 includes a first bottom edge 21, a second bottom edge 22, a third bottom edge 23, and a fourth bottom edge 24 connected in sequence. The portion of the second bottom edge 22 near the junction of the first bottom edge 21 and the second bottom edge 22 is the first fixed edge 221 of the bottom surface, and the remaining portion of the second bottom edge 22 is the first movable edge 222 of the bottom surface. The portion of the third bottom edge 23 near the junction of the third bottom edge 23 and the fourth bottom edge 24 is the second fixed edge 231 of the bottom surface, and the remaining portion of the third bottom edge 23 is the second movable edge 232 of the bottom surface. The lengths of the first fixed edge 221 and the second fixed edge 231 of the bottom surface are both greater than or equal to zero. The junction of the first movable edge 222 and the second movable edge 232 of the bottom surface is the bottom surface arc segment 25, and the same bottom surface zipper strip 26 is provided along the first movable edge 222 and the second movable edge 232 of the bottom surface.

[0042] The first top edge 11 is connected to the first bottom edge 21, the fourth top edge 14 is connected to the fourth bottom edge 24, the first fixed edge 121 of the top surface is connected to the first fixed edge 221 of the bottom surface, and the second fixed edge 131 of the top surface is connected to the second fixed edge 231 of the bottom surface. The first movable edge 122 of the top surface, the second movable edge 132 of the top surface, the first movable edge 222 of the bottom surface, and the second movable edge 232 of the bottom surface together form an L-shaped opening. The top zipper strip 16 and the bottom zipper strip 26 together form an L-shaped zipper pair. At least one zipper head 30 is provided on the L-shaped zipper pair for relative sliding.

[0043] The radius of the chamfered corners on the top arc segment 15 and the bottom arc segment 25 ranges from 1.5mm to 20mm.

[0044] The radius of the curved chamfer is 10mm.

[0045] Both the top arc segment 15 and the bottom arc segment 25 are thickened structures 40. The thickness of the top arc segment 15 is greater than the thickness of the remaining parts of the top first movable edge 122 and the top second movable edge 132, excluding the top arc segment 15. The thickness of the bottom arc segment 25 is greater than the thickness of the remaining parts of the bottom first movable edge 222 and the bottom second movable edge 232, excluding the bottom arc segment 25.

[0046] The thickened structure 40 is a triangular or triangular rigid support structure, which is located on the outside or inside of the top arc segment 15 and the bottom arc segment 25.

[0047] The thickened structure 40 is an L-shaped or L-shaped elastic support sheet, which is sewn to the inside of the top arc segment 15 and the bottom arc segment 25.

[0048] The thickened structure 40 is an L-shaped or L-shaped soft support structure, which is composed of fabric stacked at the top arc section 15 and the bottom arc section 25.

[0049] The number of zipper heads 30 is two, and the two zipper heads 30 together with the L-shaped zipper pair constitute a two-way zipper.

[0050] The bidirectional zipper can be any one of the following: invisible double-headed zipper, closed-end double-headed zipper, open-end double-headed zipper, or double-headed double-opening zipper.

[0051] The lengths of the first fixed edge 121 on the top surface, the second fixed edge 131 on the top surface, the first fixed edge 221 on the bottom surface, and the second fixed edge 231 on the bottom surface are all greater than zero.

[0052] The supplementary technical features of this utility model are as follows:

[0053] In this design, when the thickened structure 40 is a triangular rigid support structure or a triangular-like rigid support structure, its material is preferably leather; when the thickened structure 40 is an L-shaped or L-like elastic support sheet, its material is preferably silicone or TPU, and its shape fits the internal contour of the top arc segment 15 and the bottom arc segment 25.

[0054] Example 1:

[0055] See Figure 1 — Figure 4A double-opening duvet cover includes a top surface 1 and a bottom surface 2. The top surface 1 includes a first top edge 11, a second top edge 12, a third top edge 13, and a fourth top edge 14 connected in sequence. The portion of the second top edge 12 near the junction of the first top edge 11 and the second top edge 12 is the first fixed edge 121 of the top surface, and the remaining portion of the second top edge 12 is the first movable edge 122 of the top surface. The portion of the third top edge 13 near the junction of the third top edge 13 and the fourth top edge 14 is the second fixed edge 131 of the top surface, and the remaining portion of the third top edge 13 is the second movable edge 132 of the top surface. The lengths of the first fixed edge 121 and the second fixed edge 131 on the top surface are both greater than or equal to zero; the junction of the first movable edge 122 and the second movable edge 132 on the top surface is the top surface arc segment 15, and the same top surface zipper strip 16 is provided along the first movable edge 122 and the second movable edge 132 on the top surface; the bottom surface 2 includes a first bottom edge 21, a second bottom edge 22, a third bottom edge 23 and a fourth bottom edge 24 connected in sequence, the part of the second bottom edge 22 near the junction of the first bottom edge 21 and the second bottom edge 22 is the bottom surface first fixed edge 221, and the remaining part of the second bottom edge 22... Part of the bottom surface is the first movable edge 222, and the part of the third bottom edge 23 near the junction of the third bottom edge 23 and the fourth bottom edge 24 is the second fixed edge 231. The remaining part of the third bottom edge 23 is the second movable edge 232, and the lengths of the first fixed edge 221 and the second fixed edge 231 are both greater than or equal to zero. The junction of the first movable edge 222 and the second movable edge 232 is the bottom arc segment 25, and the same bottom zipper strip 26 is provided along the first movable edge 222 and the second movable edge 232. The first top edge 11 and The first bottom edge 21 is connected to the corresponding bottom edge 24, the fourth top edge 14 is connected to the corresponding bottom edge 24, the first fixed edge 121 of the top surface is connected to the corresponding first fixed edge 221 of the bottom surface, and the second fixed edge 131 of the top surface is connected to the corresponding second fixed edge 231 of the bottom surface. The first movable edge 122 of the top surface, the second movable edge 132 of the top surface, the first movable edge 222 of the bottom surface, and the second movable edge 232 of the bottom surface together form an L-shaped opening. The top zipper strip 16 and the bottom zipper strip 26 together form an L-shaped zipper pair. At least one zipper head 30 is provided on the L-shaped zipper pair for relative sliding.

[0056] When using the duvet cover, first lay the duvet cover flat on the bed, with the first top edge 11 and the first bottom edge 21 at the head of the bed and the third top edge 13 and the third bottom edge 23 at the foot of the bed. Then, pull the zipper pull 30 to open the L-shaped opening. Next, lift the top surface 1 of the duvet cover and tuck the two corners of the duvet cover from the same side into the first corner 60 and the third corner 80 of the duvet cover, respectively. Then, tuck the remaining two corners of the duvet cover into the remaining two corners of the duvet cover. Gently adjust the duvet cover to make it completely flat and smooth inside the duvet cover. Finally, pull the zipper pull 30 to close the L-shaped opening. When the duvet cover slips or becomes misaligned and needs adjustment, pull the zipper pull 30 to partially or fully open the top zipper 16 and the bottom zipper 26. Reach your hand into the opening, grab the duvet cover directly, and move it to the appropriate position.

[0057] Example 2:

[0058] The basic content is the same as in Example 1, except that:

[0059] The radius of the chamfer on the top arc segment 15 and the bottom arc segment 25 is preferably between 1.5mm and 20mm, and more preferably 10mm.

[0060] In application, the rounded chamfer, through its smooth transition design, provides a smooth turning trajectory for the zipper head when passing through the L-shaped opening corner. When the zipper head 30 slides to the L-shaped opening corner, the rounded chamfer reduces the rigid collision between the zipper head 30 and the edge of the duvet cover, reducing the risk of jamming or tooth jamming. It also ensures that the force on the zipper head 30 is evenly distributed in the rounded area, thereby avoiding fabric tearing or zipper damage caused by local stress concentration to a certain extent. At the same time, the limitation of this size range reduces the manufacturing difficulty of the rounded section, avoids the defect of curling edges caused by an excessively large rounded area, and saves raw materials.

[0061] Example 3:

[0062] The basic content is the same as in Example 1, except that:

[0063] See Figure 6 — Figure 9 Both the top arc segment 15 and the bottom arc segment 25 are thickened structures 40. The thickness of the top arc segment 15 is greater than the thickness of the remaining parts of the top first movable edge 122 and the top second movable edge 132, excluding the top arc segment 15. The thickness of the bottom arc segment 25 is greater than the thickness of the remaining parts of the bottom first movable edge 222 and the bottom second movable edge 232, excluding the bottom arc segment 25. The thickened structure 40 is preferably any one of the following three:

[0064] See Figure 7The first type of thickened structure 40 is a triangular or triangular rigid support structure, which is located on the outside or inside of the top arc segment 15 and the bottom arc segment 25.

[0065] See Figure 8 The second type of thickened structure 40 is an L-shaped or L-shaped elastic support piece, which is sewn to the inside of the top arc segment 15 and the bottom arc segment 25.

[0066] See Figure 9 The third type of thickened structure 40 is an L-shaped or L-shaped soft support structure, which is composed of fabric stacked at the top arc section 15 and the bottom arc section 25.

[0067] When the user pulls open the L-shaped zipper to put on or take out the comforter insert, the top arc section 15 and the bottom arc section 25 serve as high-frequency stress areas at the corners of the L-shaped opening. The thickened structure 40 will bear the concentrated stress generated by the turning of the zipper head 30 and the stretching of the fabric, and will evenly distribute the tension to the fabric fibers or support frame in the arc area, avoiding tearing of ordinary thickness fabric due to excessive stretching. At the same time, the thickened structure 40 can provide a stable sliding track for the zipper head 30, and with rigid or elastic support, reduce the jamming phenomenon caused by the softness of the fabric at the corner.

[0068] Example 4:

[0069] The basic content is the same as in Example 1, except that:

[0070] See Figure 5 There are two zipper heads 30, and the two zipper heads 30 together with the L-shaped zipper pair form a two-way zipper; the two-way zipper can be any one of the following: invisible double-head zipper, closed-end double-head zipper, open-end double-head zipper, or double-head double-open zipper.

[0071] In use, the two independent zipper pulls 30 work together with the L-shaped zipper pair. Users can choose to pull one side of the zipper pull 30 to open a partial opening, or pull both zipper pulls 30 simultaneously. For example, when both zipper pulls 30 are at the corner connection point of the L-shaped opening, simply pull them towards both ends of the L-shaped opening to quickly and fully open the opening. When tidying up duvet covers, users can also adjust one side of the zipper pull to open a partial area and easily tidy up the internal wrinkles.

[0072] Example 5:

[0073] The basic content is the same as in Example 1, except that:

[0074] The lengths of the first fixed edge 121 on the top surface, the second fixed edge 131 on the top surface, the first fixed edge 221 on the bottom surface, and the second fixed edge 231 on the bottom surface are all greater than zero.

[0075] In application, the lengths of the fixed edges of the top surface 1 and the bottom surface 2 are greater than zero, and the lengths of the first fixed edge 121 of the top surface and the first fixed edge 221 of the bottom surface are the same, and the lengths of the second fixed edge 131 of the top surface and the second fixed edge 231 of the bottom surface are the same. This can form a "limiting and fixing section" in the non-open area of ​​the duvet cover edge. When putting on the duvet cover, it can help the duvet core to be embedded in the duvet cover corner corresponding to the fixed edge, and restrict the movement of the duvet core through the limiting effect of the fixed edge. Even if the L-shaped opening is opened, the fixed edge can still restrict the position of the duvet core inside the duvet cover, preventing the duvet core from shifting or the corners from being exposed due to actions such as turning over or pulling.

[0076] Example 6:

[0077] The basic content is the same as in Example 1, except that:

[0078] See Figure 4 , Figure 10 Fixing rings 50 are provided at the L-shaped opening corners and the other triangles of the duvet cover.

[0079] When using it, first use the fixed edges of the top 1 and bottom 2 to initially position the comforter core, quickly correct the position of the comforter core inside the duvet cover to avoid large displacement; after the comforter core is initially aligned or a corner of the comforter core is aligned, the tie at the upper corner of the comforter core can be passed through the corresponding fixing ring 50 and tightened. This not only fixes the alignment effect, but also forms a uniform tension through the fastening of the tie and the fixing ring 50, firmly fixing the four corners of the comforter core to the four corner areas of the duvet cover, effectively preventing the comforter core from sliding or shifting due to friction and other factors during use, and ensuring that the comforter core and duvet cover are always closely fitted.

[0080] The above description is only a preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present utility model should be included in the protection scope recorded in the claims.

Claims

1. A dual-sided opening sheet set, characterized by: The cover comprises a top surface (1) and a bottom surface (2); The top surface (1) comprises a first top edge (11), a second top edge (12), a third top edge (13) and a fourth top edge (14) connected in sequence, a part of the second top edge (12) near the joint of the first top edge (11) and the second top edge (12) is a first fixed edge (121) of the top surface, the remaining part of the second top edge (12) is a first movable edge (122) of the top surface, a part of the third top edge (13) near the joint of the third top edge (13) and the fourth top edge (14) is a second fixed edge (131) of the top surface, the remaining part of the third top edge (13) is a second movable edge (132) of the top surface, and the lengths of the first fixed edge (121) and the second fixed edge (131) of the top surface are both greater than or equal to zero; the joint of the first movable edge (122) and the second movable edge (132) of the top surface is an arc-shaped section (15) of the top surface, and a same top surface zipper strip (16) is arranged along the first movable edge (122) and the second movable edge (132) of the top surface; The bottom surface (2) comprises a first bottom edge (21), a second bottom edge (22), a third bottom edge (23) and a fourth bottom edge (24) connected in sequence, a part of the second bottom edge (22) near the joint of the first bottom edge (21) and the second bottom edge (22) is a first fixed edge (221) of the bottom surface, the remaining part of the second bottom edge (22) is a first movable edge (222) of the bottom surface, a part of the third bottom edge (23) near the joint of the third bottom edge (23) and the fourth bottom edge (24) is a second fixed edge (231) of the bottom surface, the remaining part of the third bottom edge (23) is a second movable edge (232) of the bottom surface, and the lengths of the first fixed edge (221) and the second fixed edge (231) of the bottom surface are both greater than or equal to zero; the joint of the first movable edge (222) and the second movable edge (232) of the bottom surface is an arc-shaped section (25) of the bottom surface, and a same bottom surface zipper strip (26) is arranged along the first movable edge (222) and the second movable edge (232) of the bottom surface; The first top edge (11) and the first bottom edge (21) are correspondingly connected, the fourth top edge (14) and the fourth bottom edge (24) are correspondingly connected, the first fixed edge (121) of the top surface and the first fixed edge (221) of the bottom surface are correspondingly connected, and the second fixed edge (131) of the top surface and the second fixed edge (231) of the bottom surface are correspondingly connected; the first movable edge (122) and the second movable edge (132) of the top surface and the first movable edge (222) and the second movable edge (232) of the bottom surface jointly form an L-shaped opening, and the top surface zipper strip (16) and the bottom surface zipper strip (26) jointly form an L-shaped zipper pair, and at least one zipper head (30) that relatively slides with the L-shaped zipper pair is arranged on the L-shaped zipper pair.

2. A dual-sided opening fitted sheet according to claim 1, wherein: The radius of the arc-shaped chamfer on the arc-shaped section (15) of the top surface and the arc-shaped section (25) of the bottom surface ranges from 1.5 mm to 20 mm.

3. A dual-sided opening fitted sheet according to claim 2, wherein: The radius of the arc-shaped chamfer is 10 mm.

4. A dual-sided opening case as claimed in claim 1, 2 or 3, characterized in that: The top surface arc-shaped section (15) and the bottom surface arc-shaped section (25) are thickened structures (40), the thickness of the top surface arc-shaped section (15) is greater than the thickness of the rest of the top surface first movable edge (122) and the top surface second movable edge (132) except the top surface arc-shaped section (15), and the thickness of the bottom surface arc-shaped section (25) is greater than the thickness of the rest of the bottom surface first movable edge (222) and the bottom surface second movable edge (232) except the bottom surface arc-shaped section (25).

5. A dual-sided opening fitted sheet according to claim 4, wherein: The thickened structure (40) is a triangular or triangular-like hard support structure, which is sewn on the outside or inside of the top surface arc-shaped section (15) and the bottom surface arc-shaped section (25).

6. A dual-sided opening fitted sheet according to claim 4, wherein: The thickened structure (40) is an L-shaped or L-like elastic support piece, which is sewn on the inside of the top surface arc-shaped section (15) and the bottom surface arc-shaped section (25).

7. A dual-sided opening fitted sheet according to claim 4, wherein: The thickened structure (40) is an L-shaped or L-like soft support structure, which is composed of the material stack at the top surface arc-shaped section (15) and the bottom surface arc-shaped section (25).

8. A dual-sided opening case as defined in claim 1, 2 or 3, wherein: The number of the zipper heads (30) is two, and the two zipper heads (30) and the L-shaped zipper pair together constitute a two-way zipper.

9. A dual-sided opening case as defined in claim 8, wherein: The two-way zipper is any one of a hidden double-head zipper, a closed-end double-head zipper, an open-end double-head zipper, and a double-head double-open zipper.

10. A dual-sided opening case as defined in claim 1, 2 or 3, wherein: The length of the top surface first fixed edge (121), the top surface second fixed edge (131), the bottom surface first fixed edge (221), and the bottom surface second fixed edge (231) is greater than zero.

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