Injection mold for leg support handle

Abstract

The utility model relates to an injection mold of a leg support handle, the leg support handle comprises a leg support main body, a left side connecting rod, a right side connecting rod and a metal insert, the left side connecting rod and the right side connecting rod are respectively positioned at the left end and the right end of one side of the leg support main body; two ends of the metal insert are embedded in one ends, far away from the leg support main body, of the left connecting rod and the right connecting rod; the injection mold comprises a main body cavity matched with the leg support main body, a left side connecting cavity and a right side connecting cavity which are respectively matched with the left side connecting rod and the right side connecting rod, and an insert cavity matched with the metal insert, two ends of the insert cavity are respectively positioned in the left side connecting cavity and the right side connecting cavity, and a mold core surrounds the outer side of the main body cavity; the left connecting cavity is connected with a sprue which is connected with a main runner. Compared with the prior art, the integral structure is formed by integral injection molding, and is stable and reliable, the size of the sprue is improved, the minimum thickness of the reinforcing rib is set, the surface impact mark phenomenon of a product can be improved, and the product percent of pass is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of leg support molds, in particular to an injection mold for a leg support handle. Background Art

[0002] Leg rests are currently used in wheelchairs and car seats. For wheelchair users, leg rests can provide additional support and comfort, helping users to better maintain their leg position when sitting; for car seats, leg rests are mainly used to improve the riding experience of passengers, especially during long-distance travel, to reduce leg fatigue.

[0003] The leg rest handle is usually located below the leg rest of the seat, allowing the angle and position of the leg rest to be adjusted through simple operations. For example, the utility model disclosed in the publication number CN218316352U discloses a car seat and a car having the same, which proposes to set a leg rest structure with a connecting rod structure; the utility model disclosed in the publication number CN113303989A discloses a leg rest mechanism and method for a gynecological bed, which proposes to set a U-shaped moving rod and a leg rest swivel arm to directly drive the leg rest base to rotate.

[0004] The above solution has a complex structure and many parts, and cannot be formed into one piece. The structural stability cannot be guaranteed, and the related plastic product parts have surface puncture marks, resulting in a low product yield rate. Utility Model Content

[0005] The purpose of the utility model is to provide an injection mold for a leg rest handle in order to overcome the defects of the prior art, such as complex structure of the leg rest handle, large number of parts, inability to achieve one-piece molding, and lack of structural stability.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] An injection mold for a leg support handle, the leg support handle comprising a leg support body, a left connecting rod, a right connecting rod and a metal insert, the left connecting rod and the right connecting rod are respectively located at the left and right ends of one side of the leg support body, and the two ends of the metal insert are embedded in one end of the left connecting rod and the right connecting rod away from the leg support body;

[0008] The injection mold includes a main body cavity matching with the leg support body, a left connecting cavity and a right connecting cavity matching with the left connecting rod and the right connecting rod respectively, and an insert cavity matching with the metal insert, the two ends of the insert cavity are respectively located in the left connecting cavity and the right connecting cavity, the outside of the main body cavity is surrounded by a mold core, the left connecting cavity is connected to a gate, and the gate is connected to a main runner.

[0009] Further, the left connecting rod and the right connecting rod are both tree-like grid structures, including mutually connected tree-like grid parts and insert connecting parts, the ends of the tree-like grid parts are connected to the leg support body, and the ends of the metal inserts are embedded in the insert connecting parts;

[0010] The tree-like grid portion includes a main body plate, a left side plate, a right side plate and a middle plate, wherein the middle plate is located on both sides of the middle of the main body plate, the left side plate and the right side plate are respectively located on both sides of the main body plate, and a plurality of bending plate groups are evenly arranged on both sides of the extension direction of the middle plate, wherein the bending plate groups include two bending plates, which are respectively located on both sides of the middle plate and are respectively connected to the left side plate and the right side plate after being bent toward the leg support body at the same angle.

[0011] Furthermore, the connection between the gate and the left connecting cavity is a rectangle, and the length of the rectangle is at least 9.4 mm and the width is at least 2.2 mm.

[0012] Furthermore, the metal insert is a U-shaped rod-shaped structure, and the bending parts at both ends of the metal insert are located in the insert connecting parts of the left connecting rod and the right connecting rod.

[0013] Furthermore, the angle between the tree-shaped grid portion and the insert connecting portion is an obtuse angle.

[0014] Furthermore, a surface of the tree-shaped grid portion on a side close to the use side of the leg support body is a wavy line, and a surface of the tree-shaped grid portion on a side opposite to the wavy line surface is an arc line.

[0015] Furthermore, the number of the bending plate groups is at least 4.

[0016] Furthermore, the widths of the left plate, the right plate and the middle plate are not less than 2.07 mm.

[0017] Furthermore, the leg support body, the left connecting rod and the right connecting rod are all made of nylon.

[0018] Furthermore, the leg support handle is an integral injection-molded structure.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] (1) In this scheme, the left connecting cavity and the right connecting cavity are connected to the main body cavity through an injection mold, so that the left connecting rod and the right connecting rod can be integrally formed with the leg support body. The metal insert is placed in the insert cavity, and the two ends are respectively located in the left connecting cavity and the right connecting cavity. It can be directly embedded in the left connecting rod and the right connecting rod during injection molding. The overall structure is formed by integrated injection molding, which is more stable and reliable, and is easy and efficient to manufacture.

[0021] (2) This solution optimizes and widens the size of the injection gate, increases the pressure in the mold cavity, reduces the material flow resistance, increases the material flow, allows the material to enter the mold cavity as quickly as possible, and improves the surface scratches of the product, thereby increasing the product qualification rate;

[0022] This solution optimizes the thickness of the reinforcing ribs formed by the three plates of the left connecting rod and the right connecting rod, sets the minimum thickness of the reinforcing ribs, makes the overall structure more solid and convenient for injection molding, and greatly reduces the defective rate of injection molded products and products after spraying.

[0023] (3) In this solution, both the left connecting rod and the right connecting rod are configured as a tree-like grid structure, wherein the main tree-like grid portion is based on the main plate, and three parallel plates, namely the left plate, the right plate and the middle plate, are configured to form the reinforcing ribs of the main plate 125, and are connected in pairs by a bending plate group. The multi-plate structure improves the overall stability. The tree-like grid structure formed by the bending plate group can be integrally injection molded, and can provide elastic expansion and contraction during use, making the overall structure more stable and reliable.

[0024] (4) In this solution, the surface of one side of the tree-like grid portion close to the use side of the leg rest body is set as a wavy line. Compared with the arc line that bends directly inward, the wavy line is composed of multiple depressions with a small depth, and the force is more evenly distributed, which is not easy to bend and the overall structure is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of an injection mold for a leg rest handle provided in an embodiment of the utility model;

[0026] Figure 2 It is a three-dimensional structural schematic diagram of a leg support handle provided in an embodiment of the utility model;

[0027] Figure 3 It is a partial structural schematic diagram of a left connecting rod provided in an embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the side structure of a leg support handle provided in an embodiment of the utility model;

[0029] In the figure, 1. leg support handle, 11. leg support body, 12. left connecting rod, 121. left plate, 122. right plate, 123. middle plate, 124. bent plate, 125. main plate, 126. insert connecting part, 13. right connecting rod, 14. metal insert, 2. injection mold, 21. main body cavity, 22. left connecting cavity, 23. right connecting cavity, 24. insert cavity, 25. gate, 26. main runner, 27. mold core. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0034] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] Example 1

[0037] like Figure 1 and Figure 2As shown, this embodiment provides an injection mold for a leg support handle, the leg support handle 1 comprises a leg support body 11, a left connecting rod 12, a right connecting rod 13 and a metal insert 14, the left connecting rod 12 and the right connecting rod 13 are respectively located at the left and right ends of one side of the leg support body 11, and the two ends of the metal insert 14 are embedded in one end of the left connecting rod 12 and the right connecting rod 13 away from the leg support body 11;

[0038] The injection mold 2 includes a main body cavity 21 that cooperates with the leg support body 11, a left connecting cavity 22 and a right connecting cavity 23 that cooperate with the left connecting rod 12 and the right connecting rod 13 respectively, and an insert cavity 24 that cooperates with the metal insert 14. The two ends of the insert cavity 24 are respectively located in the left connecting cavity 22 and the right connecting cavity 23. The outside of the main body cavity 21 is surrounded by a mold core 27. The left connecting cavity 22 is connected to a gate 25, and the gate 25 is connected to a main channel 26.

[0039] In this solution, the left connecting cavity 22 and the right connecting cavity 23 are connected to the main cavity 21 through the injection mold 2, so that the left connecting rod 12 and the right connecting rod 13 can be integrally formed with the leg support body 11, and the metal insert 14 is placed in the insert cavity 24, and the two ends are respectively located in the left connecting cavity 22 and the right connecting cavity 23, which can be directly embedded in the left connecting rod 12 and the right connecting rod 13 during injection molding. The overall structure is formed by integrated injection molding, which is more stable and reliable, and is easy and efficient to manufacture.

[0040] Preferably, Figure 3 As shown, the left connecting rod 12 and the right connecting rod 13 are both tree-like grid structures, including mutually connected tree-like grid parts and insert connecting parts 126, the ends of the tree-like grid parts are connected to the leg support body 11, and the ends of the metal inserts 14 are embedded in the insert connecting parts 126;

[0041] The tree-like grid portion includes a main body plate 125, a left side plate 121, a right side plate 122 and a middle plate 123. The middle plate 123 is located on both sides of the middle of the main body plate 125. The left side plate 121 and the right side plate 122 are respectively located on both sides of the main body plate 125. A plurality of bending plate groups are evenly arranged on both sides of the extension direction of the middle plate 123. The bending plate groups include two bending plates 124. The two bending plates 124 are respectively located on both sides of the middle plate 123 and are respectively connected to the left side plate 121 and the right side plate 122 after being bent at the same angle toward the leg support body 11. The angle range can be within the range of 50 degrees to 75 degrees.

[0042] In this solution, the left connecting rod 12 and the right connecting rod 13 are both configured as a tree-like grid structure, and the tree-like grid part of the main body is based on the main plate 125. The left plate 121, the right plate 122 and the middle plate 123 are arranged in parallel to form the reinforcement ribs of the main plate 125, and are connected in pairs by a bending plate group. The multi-plate structure realizes the improvement of the overall stability. The tree-like grid structure formed by the bending plate group can be integrally injection molded on the one hand, and on the other hand, it provides elastic expansion and contraction during use, and the overall stability is more reliable.

[0043] The leg support body 11, the left connecting rod 12 and the right connecting rod 13 are all made of nylon PA6, which has high requirements for mold design and product spraying and molding process. In the mold design, the conventional side overlap injection molding, if the gate size is too small, will lead to a narrow injection molding process adjustment window during the actual production process of the product, and the gate area often has punch marks, which affects the material quality. After spraying, product defects cannot be covered, and the product qualification rate is reduced.

[0044] In this regard, this solution optimizes and widens the size of the injection gate, increases the pressure in the mold cavity, and proposes

[0045] The connection between the gate 25 and the left connecting cavity 22 is a rectangle, the length of the rectangle is at least 9.4 mm, and the width is at least 2.2 mm. The material flow resistance is reduced, and the material enters the mold cavity as quickly as possible. During injection molding, the material is continuously and quickly added to the mold cavity to allow the plastic to cool and solidify under high pressure.

[0046] On the other hand, the present solution increases the wall thickness of the reinforcing rib connection, improves the glue feeding amount, and widens the injection molding process window, that is, the widths of the left plate 121, the right plate 122, and the middle plate 123 are not less than 2.07 mm.

[0047] The metal insert 14 is a U-shaped rod structure, and the bending parts at both ends of the metal insert 14 are located in the insert connecting parts 126 of the left connecting rod 12 and the right connecting rod 13 .

[0048] The angle between the tree-shaped grid portion and the insert connecting portion 126 is an obtuse angle, which is within the range of 120 degrees to 160 degrees.

[0049] Preferably, Figure 4 As shown, the surface of the tree-like grid portion close to the use side of the leg support body 11 is a wavy line, and the surface of the tree-like grid portion opposite to the wavy line surface is an arc line.

[0050] In this solution, the surface of one side of the tree-shaped grid part close to the use side of the leg support body 11 is set as a wavy line. Compared with the arc line that bends directly inward, the wavy line has multiple depressions, the depth of the depression is small, the force is more uniform, it is not easy to bend, and the overall structure is more stable. In this embodiment, two depressions are set.

[0051] The number of the bending plate groups is at least 4, and 4 groups are provided in this embodiment.

[0052] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. An injection mold for a leg rest handle, characterized in that: The leg support handle (1) comprises a leg support body (11), a left connecting rod (12), a right connecting rod (13) and a metal insert (14), wherein the left connecting rod (12) and the right connecting rod (13) are respectively located at the left and right ends of one side of the leg support body (11), and the two ends of the metal insert (14) are embedded in one end of the left connecting rod (12) and the right connecting rod (13) away from the leg support body (11); The injection mold (2) includes a main body cavity (21) matched with the leg support body (11), a left connecting cavity (22) and a right connecting cavity (23) respectively matched with the left connecting rod (12) and the right connecting rod (13), and an insert cavity (24) matched with the metal insert (14), the two ends of the insert cavity (24) are respectively located in the left connecting cavity (22) and the right connecting cavity (23), the outer side of the main body cavity (21) is surrounded by a mold core (27), the left connecting cavity (22) is connected to a gate (25), and the gate (25) is connected to a main flow channel (26).

2. The injection mold of the leg support handle according to claim 1, characterized in that: The left connecting rod (12) and the right connecting rod (13) are both tree-like grid structures, comprising mutually connected tree-like grid parts and insert connecting parts (126), the ends of the tree-like grid parts are connected to the leg support body (11), and the ends of the metal inserts (14) are embedded in the insert connecting parts (126); The tree-like grid portion includes a main body plate (125), a left side plate (121), a right side plate (122) and a middle plate (123), wherein the middle plate (123) is located on both sides of the middle of the main body plate (125), and the left side plate (121) and the right side plate (122) are respectively located on both sides of the main body plate (125). A plurality of bending plate groups are evenly arranged on both sides of the extension direction of the middle plate (123), and the bending plate groups include two bending plates (124), which are respectively located on both sides of the middle plate (123), and are respectively connected to the left side plate (121) and the right side plate (122) after being bent at the same angle toward the leg support body (11).

3. The injection mold of the leg support handle according to claim 2, characterized in that: The connection between the gate (25) and the left connecting cavity (22) is a rectangle, the length of the rectangle is at least 9.4 mm, and the width is at least 2.2 mm.

4. The injection mold of the leg support handle according to claim 2, characterized in that: The metal insert (14) is a U-shaped rod-shaped structure, and the bending parts at both ends of the metal insert (14) are located in the insert connecting parts (126) of the left connecting rod (12) and the right connecting rod (13).

5. The injection mold of the leg support handle according to claim 2, characterized in that: The angle between the tree-shaped grid portion and the insert connecting portion (126) is an obtuse angle.

6. The injection mold of the leg rest handle according to claim 2, characterized in that: The surface of the tree-shaped grid portion on the side close to the use side of the leg support body (11) is a wavy line, and the surface of the tree-shaped grid portion on the side opposite to the wavy line surface is an arc line.

7. The injection mold of the leg rest handle according to claim 2, characterized in that: The number of the bending plate groups is at least 4.

8. The injection mold of the leg support handle according to claim 2, characterized in that: The widths of the left side plate (121), the right side plate (122) and the middle plate (123) are not less than 2.07 mm.

9. The injection mold of the leg rest handle according to claim 1, characterized in that: The leg support body (11), the left connecting rod (12) and the right connecting rod (13) are all made of nylon.

10. The injection mold of the leg rest handle according to claim 1, characterized in that: The leg support handle (1) is an integral injection-molded structure.

Images