Chair and web frame and method of manufacturing same, mold

Abstract

The application discloses a chair and a mesh cloth frame and a manufacturing method and a mold thereof, the mold comprises a lower mold, a first mold frame, a second mold frame and the lower mold which are sequentially arranged, a mold core is fixed in the center of the upper mold, and a lower mold core is fixed in the center of the lower mold; the first mold frame and the second mold frame are opened, the mesh cloth fabric is put in, the mold is closed, the mesh cloth frame is injection molded, then the second mold frame and the upper mold are opened, and the mesh cloth frame is taken out. According to the scheme, the annular support is injection molded around the mesh cloth by the mold, and the annular support and the mesh cloth are combined and connected into one body, the quality of the mesh cloth frame is ensured, and the manufacturing cost is reduced. The mesh cloth frame is nested on the frame body of the chair part from outside to inside, so that the installation workload and difficulty of the mesh cloth are reduced, the manufacturing cost is greatly reduced, and the production quality is fully ensured.

Description

Technical Field

[0001] This invention belongs to the fields of furniture technology and injection mold technology, and relates to a chair and its mesh frame, and more particularly to a method for manufacturing the mesh frame and a mold. Background Technology

[0002] In existing chair structures, chair components with mesh fabric (such as seats, backrests, lumbar supports, or headrests) are mainly attached to the frame by a groove on the surface of the frame, using only a strip or a clamping mechanism. As a result, the connection is not secure. When a user sits or leans against the mesh fabric, the fabric will shift at the point of connection with the frame due to the weight. Consequently, the mesh fabric will loosen over time, reducing the comfort of sitting or leaning against it.

[0003] Therefore, in order to firmly bond the mesh to the frame, nails are used to fix the joint between the mesh and the frame. Although this can effectively prevent the mesh from falling off the frame, the nailing method is quite time-consuming and not conducive to mass production.

[0004] Patent document CN201332857Y discloses a mesh chair frame and mesh chair combination structure, which uses injection molding to combine the mesh fabric (or elastic mesh) with the frame to increase the stability of the mesh fabric and frame combination: a predetermined inner frame part of the chair frame is injection molded, the mesh fabric is stretched and fixed to the inner frame of the chair frame, and then an injection molding layer is formed on the outer frame of the chair frame to cover and fix the edge of the mesh fabric firmly; or as disclosed in patent document TW200800077A, a mesh chair seat and back cushion molding method is used, the elastic mesh is cut into the desired shape of the seat and back cushion, and then a frame edge is formed corresponding to the edge of the elastic mesh. Then, the elastic mesh is wrapped around the frame edge to form the frame edge and combined and shaped. Then, the elastic mesh and frame edge that have been combined and shaped as one are placed into a mold, and the frame edge and elastic mesh are injection molded to obtain the finished product.

[0005] However, the method of first tightening and fixing the mesh fabric to the frame before filling has the following problems:

[0006] 1. Before injection molding, the mesh needs to be stretched and fixed to the frame or frame strip. This operation is complicated and tedious, and the positioning is difficult. It requires manual operation and inevitably has defects such as insufficient tension of the mesh and incomplete edge positioning.

[0007] 2. Place the frame or frame strip with the stretched and fixed mesh into the mold for injection molding. The melting point of the covering material should be different from that of the frame and the mesh. The manufacturing cost is high. If the frame is large and heavy, it will be difficult to take it out of the mold and put it in, which will increase the manufacturing cost and affect the production quality.

[0008] To address this issue, the inventors proposed an integral injection molding process to form a mesh frame from the mesh fabric and the annular support. This mesh frame is then nested into the frame of the chair component from the outside in, thereby reducing the workload and difficulty of mesh fabric installation, significantly lowering manufacturing costs, and ensuring high production quality. This invention relates to a method for manufacturing this mesh frame and a manufacturing mold. Summary of the Invention

[0009] To address the aforementioned technical problems, one objective of this invention is to provide a method for manufacturing a mesh frame. This method involves injection molding a ring-shaped support around the perimeter of the mesh using a mold and then combining the two together to ensure the quality of the mesh frame and reduce manufacturing costs.

[0010] The second objective of this invention is to provide a manufacturing mold for a mesh frame, using the aforementioned manufacturing method.

[0011] The third objective of this invention is to provide a mesh frame manufactured using the aforementioned manufacturing method and mold.

[0012] The fourth objective of this invention is to provide a chair that uses the aforementioned mesh frame.

[0013] To achieve the above objectives, the present invention adopts the following technical solution:

[0014] A method for manufacturing a mesh frame using injection molding, the mold comprising an upper mold, a first mold frame, a second mold frame, and a lower mold arranged sequentially, wherein an upper mold core is fixed in the center of the upper mold, and a lower mold core is fixed in the center of the lower mold; the first mold frame is positioned between the lower mold and the second mold frame, moving relative to the lower mold when the mold is opened, and fitting outside the lower mold core when the mold is closed; the second mold frame is positioned between the first mold frame and the upper mold, moving relative to the lower mold when the mold is opened, and fitting outside the lower mold core when the mold is closed; the method comprises the following steps: 1) opening the gap between the first mold frame and the second mold frame to insert the mesh fabric; 2) closing the mold and injection molding the mesh frame; 3) opening the gap between the second mold frame and the upper mold to remove the mesh frame.

[0015] Preferably, the lower mold, the second mold frame, and the upper mold are fitted together to form a molding cavity for injection molding the ring support. The first mold frame and the second mold frame are fitted together to form a first gap for accommodating the mesh fabric. The second mold frame and the lower mold are fitted together to form a second gap for accommodating the mesh fabric, a cutting surface for cutting the mesh fabric, and a clamping gap for clamping the free part of the mesh fabric edge. The lower mold and the upper mold are fitted together to form a third gap for accommodating the edge of the mesh fabric. The lower mold core and the upper mold are fitted together to form a fourth gap for accommodating the mesh fabric. The lower mold core and the upper mold core are fitted together to form a fifth gap for accommodating the mesh fabric. The area between the second mold frame and the upper mold is a demolding surface.

[0016] Preferably, the third gap is tightly fitted with the mesh fabric.

[0017] Preferably, in step 1), the mesh fabric is placed between the first mold frame and the second mold frame, between the lower mold and the upper mold, and between the lower mold core and the upper mold core.

[0018] Preferably, the front end of the lower mold core is inserted into the groove of the upper mold to support and pull the mesh fabric, thereby controlling the degree of slack of the mesh frame after molding.

[0019] Preferably, the upper mold is mounted on the upper mold fixing plate, and the upper mold fixing plate is equipped with a hot runner plate and a gate assembly. The hot runner plate is fixed between the upper mold and the upper mold fixing plate. The gate assembly is connected to the molding cavity through the hot runner plate and the upper mold and through multiple inlet gates set on the upper mold. The hot runner plate is heated by oil temperature or electric heating.

[0020] Preferably, the mold also includes a mesh fabric feeding device for feeding the mesh fabric, which is installed on the lower mold, the first mold frame, or the second mold frame.

[0021] A mold for manufacturing a mesh frame, used to implement the manufacturing method of the mesh frame as described above.

[0022] A mesh frame for a chair, made using the mold described above.

[0023] A chair, comprising a mesh frame for the chair as described above.

[0024] This invention, by employing the above-mentioned technical solution, uses a mold to injection mold a ring-shaped support around the perimeter of the mesh fabric, combining the two into one unit. This ensures the quality of the mesh frame and reduces manufacturing costs. The mesh frame is then nested into the chair component's frame from the outside in, thereby reducing the workload and difficulty of mesh installation, significantly lowering manufacturing costs, and fully guaranteeing production quality. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0026] Figure 1 This is a schematic diagram of the structure of the chair component of the present invention.

[0027] Figure 2 for Figure 1 AA sectional view.

[0028] Figure 3 for Figure 2 Enlarged view of point I.

[0029] Figure 4 This is a 3D view of the chair components.

[0030] Figure 5 This is an exploded view of the chair components.

[0031] Figure 6 This is one of the 3D views of the mesh frame (unused installation state).

[0032] Figure 7 This is the second 3D view of the mesh frame (unused installation state).

[0033] Figure 8 This is a structural diagram of the mesh frame mold (in the mold-opening state).

[0034] Figure 9 This is a structural diagram of the mesh frame mold (in the mold-closed state).

[0035] Figure 10 This is a longitudinal sectional view of the mesh frame mold (in the mold-closed state).

[0036] Figure 11 for Figure 10 Enlarged view of point A in the middle.

[0037] Figure 12 This is a cross-sectional view of the mesh frame mold (in the mold-closed state).

[0038] Figure 13 for Figure 12 Enlarged view of section B in the middle.

[0039] Figure 14 This is a schematic diagram of the lower mold in the mesh frame mold.

[0040] Figure 15 This is a longitudinal sectional view of the lower mold in the mesh frame mold.

[0041] Figure 16 This is a schematic diagram of the structure of the first mold frame in the mesh frame mold.

[0042] Figure 17 This is one of the structural schematic diagrams of the second mold frame in the mesh frame mold.

[0043] Figure 18 This is the second structural schematic diagram of the second mold frame in the mesh frame mold.

[0044] Figure 19 This is a longitudinal sectional view of the second mold frame in the mesh frame mold.

[0045] Figure 20 This is a schematic diagram of the upper mold in the mesh frame mold.

[0046] Among them, 1. Mesh fabric; 101. Edge; 2. Annular bracket; 201. Outer covering; 202. Embedded part; 203. Protruding part; 204. Groove; 3. Frame; 301. Frame body; 302. Flange part; 303. Hook part; 304. Insertion groove; 305. Window; 400. Mesh fabric; 401. Mesh fabric feeding device; 402. Lower mold; 4021. Lower mold core; 4022. First annular groove; 4023. First annular protrusion; 4024. Second annular groove; 403. First mold frame; 404. Guide post; 405. Spring; 40 6. Driving component; 407. Second mold frame; 4071. First gap; 4072. Second gap; 4073. Cutting surface; 4074. Clamping gap; 4075. Demolding surface; 4076. Third annular groove; 4077. Second annular protrusion; 408. Upper mold; 4081. Upper mold core; 4082. Third gap; 4083. Fourth gap; 4084. Fifth gap; 4085. Third annular protrusion; 4086. Fourth annular groove; 409. Hot runner plate; 410. Upper mold fixing plate; 411. Sprue assembly; 412. Ejector pin assembly. Detailed Implementation

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0048] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0049] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0050] In the description of this invention, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] For ease of description, this invention defines "upper, lower, inner, and outer" as the state in which the mesh fabric is installed on the frame of the chair component:

[0056] The side of the mesh that comes into contact with the human body is defined as "upper," meaning the surface of the mesh that contacts the human body is the upper surface. Conversely, the back side of the mesh that is opposite the upper surface is defined as "lower."

[0057] The four edges of the mesh fabric are defined as "outer", and the center of the mesh fabric is defined as "inner".

[0058] Example 1:

[0059] like Figure 6 and Figure 7 The illustrated mesh frame for a chair includes a mesh 1 and an annular support 2. The four edges 101 of the mesh 1 are embedded in the annular support 2, and the annular support 2 is integrally and fixedly connected to the four edges 101 of the mesh 1 by means of insert injection molding.

[0060] In this embodiment, as Figure 3 As shown, the annular bracket 2 has an integrally formed insert portion 202 extending from the outside to the inside. The insert portion 202 is annular, and the four edges 101 of the mesh fabric 1 are inserted and fixed in the insert portion 202. The lower surface of the annular bracket 2 has an integrally formed locking protrusion 203, which is annular. The lower surface of the annular bracket 2 also has an integrally formed groove 204, which is annular.

[0061] In this embodiment, the annular support 2 has an integrally formed outer covering 201 extending from bottom to top. The outer covering 201 is annular, and the junction of the four edges of the mesh 1 with the annular support 2 is located inside the outer covering 201.

[0062] In this embodiment, the mesh frame is in its natural state before installation and use, such as... Figure 6 and Figure 7 As shown, the mesh fabric 1 is in a relaxed state.

[0063] like Figures 1 to 5 The chair component shown includes a frame 3, which serves as the frame for the seat, backrest, lumbar support, or headrest. It also includes a mesh frame for the chair as described above, with the mesh 1 covering the top of the frame 3, and an annular bracket 2 nested on the outer side of the top of the frame 3. In this embodiment, the frame is the frame for the seat.

[0064] The mesh fabric and the ring-shaped support are integrally molded using an insert injection molding process to form the mesh frame. This not only enables automated continuous production but also ensures the accurate positioning of the mesh fabric's edges, thus guaranteeing the appropriate slack. The mesh frame is then nested into the chair component's frame from the outside in. This ensures the mesh fabric is fully tensioned after installation, facilitating manufacturing and installation. Furthermore, when the mesh fabric supports a person, the force it bears is converted into a force that expands the ring-shaped support. The ring-shaped support itself is strong enough to withstand the mesh fabric's stress, further ensuring the mesh fabric's tension and lifespan. This reduces the workload and difficulty of mesh fabric installation, significantly lowers manufacturing costs, and fully guarantees production quality.

[0065] In this preferred embodiment, such as Figure 3 and Figure 5 As shown, the top of the frame 3 has an integrally formed flange portion 302 extending from the inside out. The flange portion 302 is annular, thus forming an annular groove 304 between the frame body 301 and the flange portion 302. The insert portion 202 of the annular bracket 2 is embedded and fixed in the groove 304. The four edges 101 of the mesh fabric 1 wrap around the flange portion 302 of the frame 3 and enter the groove 304. The outer part 201 of the annular bracket 2 surrounds the outside of the flange portion 302 of the frame 3, and the mesh fabric 1 passes through the two and is clamped. In this way, the edge of the mesh fabric undergoes multiple bending and nesting clamping during the process of wrapping the top of the frame, which not only increases the tension of the mesh fabric, but also increases the structural strength of the annular bracket. Part of the force borne by the mesh fabric is borne by the flange portion of the frame, further ensuring the tension and service life of the mesh fabric.

[0066] In this preferred embodiment, the frame 3 has multiple hook portions 303 integrally formed in the groove 304. The hook portions 303 enter the groove 204 of the annular bracket 2 and engage with the protrusion 203. This not only increases the bonding and fixing strength between the annular bracket and the frame, but also prevents the embedded part of the annular bracket from coming out of the groove, thereby preventing the annular bracket from being stretched or twisted and deformed. The force on the mesh can also be distributed by multiple buckle structures, further ensuring the tension and service life of the mesh.

[0067] In this preferred embodiment, the four edges of the mesh fabric 1 extend from the inner side of the embedding portion 202 into the groove 204. This not only strengthens the connection between the mesh fabric and the annular support, but also ensures that the edges of the mesh fabric are deeply embedded in the groove after the mesh fabric frame is installed onto the frame of the chair component, preventing the mesh fabric and the annular support from separating.

[0068] In this preferred embodiment, multiple hook portions 303 are evenly distributed on the lower side wall of the groove 304, and the flange portion 302 is provided with openings 305 corresponding to the positions of the hook portions 303, so as to facilitate the integral forming of the hook portions on the frame.

[0069] The present invention also discloses a chair, including a chair component as described above.

[0070] The present invention also discloses a mold for manufacturing the above-mentioned mesh frame, such as... Figure 8 and Figure 9As shown, the mold includes an upper mold 408, a first mold frame 403, a second mold frame 407, and a lower mold 402 arranged sequentially. The upper mold core 4081 is fixed in the center of the upper mold 408, and the lower mold core 4021 is fixed in the center of the lower mold 402. The first mold frame 403 is located between the lower mold 402 and the second mold frame 407. It moves relative to the lower mold 402 when the mold is opened and is fitted outside the lower mold core 4021 when the mold is closed. The second mold frame 407 is located between the first mold frame 403 and the upper mold 408. It moves relative to the lower mold 402 when the mold is opened and is fitted outside the lower mold core 4021 when the mold is closed.

[0071] like Figure 10 , Figure 11 , Figure 12 and Figure 13 As shown, the lower mold 402, the second mold frame 407, and the upper mold 408 are fitted together to form a molding cavity for injection molding the annular support 2. The first mold frame 403 and the second mold frame 407 are fitted together to form a first gap 4071 for accommodating the mesh fabric 400. The second mold frame 407 and the lower mold 402 are fitted together to form a second gap 4072 for accommodating the mesh fabric 400, a cutting surface 4073 for cutting the mesh fabric 400, and a clamping gap 4074 for clamping the free part of the edge of the mesh fabric 1. The lower mold 402 and the upper mold 408 are fitted together to form a third gap 4082 for accommodating the edge of the mesh fabric 1. The lower mold core 4021 and the upper mold 408 are fitted together to form a fourth gap 4083 for accommodating the mesh fabric 1. The lower mold core 4021 and the upper mold core 4081 are fitted together to form a fifth gap 4084 for accommodating the mesh fabric 1. The demolding surface 4075 is between the second mold frame 407 and the upper mold 408.

[0072] Thus, during mold opening, the lower mold 402, the first mold frame 403, the second mold frame 407, and the upper mold 408 separate, and the mesh frame is removed from between the second mold frame 407 and the upper mold 408; the mesh fabric 400 is placed between the first mold frame 403 and the second mold frame 407, between the lower mold 402 and the upper mold 408, and between the lower mold core 4021 and the upper mold core 4081; during mold closing, the second mold frame 407 and the lower mold 402 cut the mesh fabric 400 at the cutting surface 4073, and the first gap 40 located outside the cutting surface 4073... 71 and the second gap 4072 are used to accommodate the waste material remaining after cutting the mesh fabric 400. The third gap 4082, the fourth gap 4083 and the fifth gap 4084 located inside the cutting surface 4073 are used to accommodate the mesh fabric 1. The free part of the edge of the mesh fabric 1 is clamped and positioned by the clamping gap 4074 inside the cutting surface 4073. The clamping gap 4074 and the third gap 4082 are located on both sides of the molding cavity, so that the edge of the mesh fabric passes through the molding cavity, and the injection-molded annular support 2 is fused with the edge of the mesh fabric 1 into one piece.

[0073] To prevent the molten material from leaking along the third gap 4082, this embodiment preferably sets the third gap 4082 to fit tightly with the mesh fabric 400. That is, the thickness of the third gap 4082 is equal to or slightly smaller than the thickness of the mesh fabric, while the thickness of the first gap 4071, the second gap 4072, the fourth gap 4083 and the fifth gap 4084 can be slightly greater than the thickness of the mesh fabric to facilitate the movement of the mesh fabric.

[0074] In this preferred embodiment, the front end of the lower mold core 4021 is inserted into the groove of the upper mold 408 to support and pull the mesh fabric 400, thereby controlling the relaxation amount of the central mesh fabric 1 of the formed mesh frame as needed. Both the upper mold core 4081 and the lower mold core 4021 are installed and fixed in a detachable manner. In this way, the relaxation amount of the mesh fabric can be changed by adjusting the two together to meet different installation tension requirements.

[0075] In this preferred embodiment, the upper mold 408 is mounted on the upper mold fixing plate 410. A hot runner plate 409 and a gate assembly 411 are mounted on the upper mold fixing plate 410. The hot runner plate 409 is fixed between the upper mold 408 and the upper mold fixing plate 410. The gate assembly 411 communicates with the molding cavity through the hot runner plate 409 and the upper mold 408, and through multiple inlet gates provided on the upper mold 408. The hot runner plate 409 is heated by oil or electricity, thus ensuring good fluidity of the melt in the runners of the gate assembly and guaranteeing the injection molding quality.

[0076] In this preferred embodiment, such as Figure 10 and Figure 12 As shown, an ejector assembly 412 is also provided between the upper mold 408 and the hot runner plate 409. The ejector assembly 412 includes an ejector pin, a positioning plate, and a push plate. The push plate is driven to move by the ejector pin drive component, thereby pushing the ejector pin out and realizing the demolding of the injection-molded mesh frame from the upper mold. The ejector pin drive component is a cylinder, a motor, or a hydraulic cylinder.

[0077] In this preferred embodiment, such as Figure 8 As shown, it also includes a mesh fabric feeding device 401 for feeding the mesh fabric 100. The mesh fabric feeding device 401 includes a feeding device and a receiving device. The feeding device and the receiving device are fixed to the top and bottom of the lower mold 402 respectively in an up-down manner. In other embodiments, they can also be fixed to the top and bottom of the first mold frame 403 or the second mold frame 407 respectively in an up-down manner. The feeding device and the receiving device use an automatic winding method to transfer the mesh fabric 100 to achieve automatic feeding during continuous injection molding.

[0078] In this preferred embodiment, a guide post 404 is installed on the lower mold 402, and a first mold frame 403 is installed on the lower mold 402 and moves along the guide post. A spring 405 is installed between the first mold frame 403 and the lower mold 402. When the mold is closed, the first mold frame 403 is pushed to the periphery of the lower mold 402 by the second mold frame 407. When the mold is opened, the first mold frame 403 is reset under the action of the spring 405, thereby pushing the edge waste material of the cut mesh fabric 400 out of the lower mold 402 to facilitate the movement of the mesh fabric 400.

[0079] In this preferred embodiment, the second mold frame 407 is mounted on the upper mold 408 and driven by the driving member 406 to move relative to the upper mold 408 to achieve mold opening and closing. In other embodiments, the second mold frame 407 may also be mounted on the guide post 404 of the lower mold 402, and its driving member is mounted between the second mold frame 407 and the first mold frame 403 or the lower mold 402.

[0080] In this preferred embodiment, such as Figure 14 and Figure 15 As shown, the cavity of the lower mold 402 is arranged around the lower mold core 4021, and includes a first annular groove 4022, a first annular protrusion 4023 and a second annular groove 4024 from the outside to the inside. The first annular groove 4022 cooperates with the second mold frame 407 to form a clamping gap 4074 for clamping the free part of the edge of the mesh fabric 1. The first annular protrusion 402 is used to form a part of the groove 204 of the annular bracket 2, and the second annular groove 4024 is used to form the locking protrusion 203 of the annular bracket 2.

[0081] In this preferred embodiment, such as Figure 16 and Figure 17 As shown, the first mold frame 403 and the second mold frame 407 are positioned by the cooperation of the concave and convex structures.

[0082] In this preferred embodiment, such as Figure 18 and Figure 19 As shown, the cavity of the second mold frame 407 includes a third annular groove 4076 and a second annular protrusion 4077. The third annular groove 4076 cooperates with the upper mold 408 to form the outer part 201 of the annular bracket 2, and the second annular protrusion 4077 is used to form another part of the groove 204 of the annular bracket 2.

[0083] In this preferred embodiment, such as Figure 20 As shown, the upper mold 408 cavity includes a third annular protrusion 4085 and a fourth annular groove 4086. The third annular protrusion 4085 cooperates with the lower mold 402 to form the embedded part 202 of the annular bracket 2. The fourth annular groove 4086 cooperates with the third annular groove 4076 of the second mold frame 407 to form the outer part 201 of the annular bracket 2.

[0084] The present invention also discloses a method for manufacturing the above-mentioned mesh frame, which uses the above-mentioned mold and includes the following steps:

[0085] 1) Open the gap between the first mold frame 403 and the second mold frame 407, and insert the mesh fabric 100;

[0086] 2) Molding and injection molding of the mesh frame;

[0087] 3) Open the space between the second mold frame 407 and the upper mold 408, and remove the mesh frame; return to step 1) to continue injection molding.

[0088] In the description of this specification, the terms "one embodiment," "some embodiments," "one implementation," "specific implementation," "other implementation," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment, implementation, or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described above can also be combined in any suitable manner in one or more embodiments, implementations, or examples. The technical solutions described in this invention also include technical solutions formed by any one or more specific features, structures, materials, or characteristics described above, either individually or in combination.

[0089] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A method for manufacturing a mesh frame, comprising injection molding using a mold, characterized in that, The mesh frame includes a mesh (1) and an annular bracket (2). The four edges (101) of the mesh (1) are embedded in the annular bracket (2). The annular bracket (2) is integrally connected to the four edges (101) of the mesh (1) by means of insert injection molding. An embedded part (202) extending from the outside to the inside is integrally formed on the annular bracket (2). The embedded part (202) is annular. The four edges (101) of the mesh (1) are embedded and fixed in the embedded part (202). An outer covering part (201) extending from the bottom to the top is integrally formed on the annular bracket (2). The outer covering part (201) is annular. The junction of the four edges of the mesh (1) and the annular bracket (2) is located on the inner side of the outer covering part (201). Before the mesh frame is installed and used, the mesh (1) is in a loose state. The mold includes an upper mold, a first mold frame, a second mold frame, and a lower mold arranged sequentially. The upper mold core is fixed in the center of the upper mold, and the lower mold core is fixed in the center of the lower mold. The first mold frame is located between the lower mold and the second mold frame, and moves relative to the lower mold when the mold is opened, and is fitted outside the lower mold core when the mold is closed. The second mold frame is located between the first mold frame and the upper mold, and moves relative to the lower mold when the mold is opened, and is fitted outside the lower mold core when the mold is closed. The lower mold, the second mold frame, and the upper mold are joined together to form a molding cavity for injection molding a ring-shaped support. The first mold frame and the second mold frame are joined together to form a first gap for accommodating the mesh fabric. The second mold frame and the lower mold are joined together to form a second gap for accommodating the mesh fabric, a cutting surface for cutting the mesh fabric, and a clamping gap for clamping the free edge of the mesh fabric. The lower mold and the upper mold are joined together to form a third gap for accommodating the edge of the mesh fabric. The lower mold core and the upper mold are joined together to form a fourth gap for accommodating the mesh fabric. The lower mold core and the upper mold core are joined together to form a fifth gap for accommodating the mesh fabric. The area between the second mold frame and the upper mold is a demolding surface. Implement the following steps: 1) Open the gap between the first and second mold frames and insert the mesh fabric; 2) Molding and injection molding of the mesh frame; 3) Open the second mold frame and the upper mold frame, and take out the mesh frame.

2. The method for manufacturing a mesh frame according to claim 1, characterized in that, The third gap fits tightly with the mesh fabric.

3. The method for manufacturing a mesh frame according to claim 1, characterized in that, In step 1), the mesh fabric is placed between the first mold frame and the second mold frame, between the lower mold and the upper mold, and between the lower mold core and the upper mold core.

4. The method for manufacturing a mesh frame according to claim 1, characterized in that, The front end of the lower mold core is inserted into the groove of the upper mold to support and pull the mesh fabric, thereby controlling the slack of the mesh frame after molding.

5. The method for manufacturing a mesh frame according to claim 1, characterized in that, The upper mold is mounted on the upper mold fixing plate. The upper mold fixing plate is equipped with a hot runner plate and a gate assembly. The hot runner plate is fixed between the upper mold and the upper mold fixing plate. The gate assembly is connected to the molding cavity through the hot runner plate and the upper mold and through multiple inlet gates set on the upper mold. The hot runner plate is heated by oil temperature or electric heating.

6. The method for manufacturing a mesh frame according to claim 1, characterized in that, The mold also includes a mesh fabric feeding device for feeding the mesh fabric, which is installed on the lower mold, the first mold frame, or the second mold frame.

7. A manufacturing mold for a mesh frame, characterized in that, A method for manufacturing a mesh frame as described in any one of claims 1 to 6.

8. A mesh frame for a chair, characterized in that, It is produced using the mold described in claim 7.

9. A chair, characterized in that, Includes a mesh frame for a chair as described in claim 8.

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