Rotary coupling structure, rotary coupling device, and method for manufacturing rotary coupling structure

Abstract

A hook member (2) which is a primary molded product of resin injection molding and a retainer member (4) which is a secondary molded product are rotatably connected to each other to constitute a hook (1). The primary molded product is provided with a shaft portion (23) formed in a non-diameter-reducible manner. The secondary molded product is provided with a bearing portion (43) connected to the shaft portion (23) and formed in a non-diameter-extendible manner. The shaft portion (23) is configured to be rotatable by moving in the X-axis direction from an abutting connection state with respect to the bearing portion (43). The hook member (2) and the retainer member (4) are composed of POM.

Description

Technical Field

[0001] This invention relates to a rotary linkage structure, a rotary linkage device, and a method for constructing the rotary linkage structure. Background Technology

[0002] Previously, for rotary coupling devices, Patent Document 1 describes a universal rotary hook assembly in which the hook and the rod (the retainer-side component) are engaged by manual assembly. Additionally, Patent Document 2 describes a synthetic resin belt coupling device configured in a single injection molding process such that the neck of the belt mounting component is inserted into a through hole in the locking component.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: US Patent No. 5,127,137

[0006] Patent Document 2: Japanese Patent Application Publication No. 7-208440 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] However, in the universal rotating hook assembly described in Patent Document 1, the hook and the rod (the component on the retainer side) are engaged only by manual assembly, so the engagement requires labor and time.

[0009] Furthermore, in the synthetic resin belt connector described in Patent Document 2, the synthetic resin belt connector is constructed in a single injection molding process, thus eliminating the aforementioned labor and time. However, in order to achieve the state in which the neck of the belt mounting member is embedded in the through hole of the locking member, the gap between the neck and the through hole becomes larger, and therefore, the mold structure for forming the embedded state may become complex.

[0010] The purpose of this invention is to provide a rotary connection structure, a rotary connection device, and a method for constructing the rotary connection structure that eliminates the need for manual assembly of two components and reduces the clearance between the two components.

[0011] Solution for solving the problem

[0012] The rotary connection structure of the present invention is a rotary connection structure in which a primary molded part and a secondary molded part formed by resin injection molding are rotatably connected to each other. The primary molded part is provided with a shaft portion, and the secondary molded part is provided with a bearing portion connected to the shaft portion. The shaft portion is configured to be rotatable by moving from an abutting connection state relative to the bearing portion.

[0013] The rotary coupling device of the present invention is a rotary coupling device composed of a resin injection molded hook member and a retaining member, wherein the hook member is provided with a shaft portion formed in a non-reducible manner, and the retaining member is provided with a bearing portion formed in a non-expandable manner. The shaft portion is configured to be rotatable by moving from an abutting connection state relative to the bearing portion. In the rotatable state of the shaft portion relative to the bearing portion, the axial clearance between the hook member and the retaining member is less than 0.5 mm.

[0014] In the method of constructing the rotary linkage structure of the present invention, a primary molded article forming a shaft portion is resin injection molded, and after the surface of the primary molded article is cured, a secondary molded article is resin injection molded in such a way that a bearing portion is formed in an abutting connection state relative to the shaft portion. After the primary molded article and the secondary molded article are cured, the shaft portion is initially moved relative to the bearing portion to set it to a rotatable state.

[0015] According to the present invention, a rotary connection structure, a rotary connection device, and a method of constructing the rotary connection structure can be provided, which can reduce the clearance between the two components without requiring manual assembly of the two components. Attached Figure Description

[0016] Figure 1 This is a perspective view showing the hook and loop of an embodiment of the present invention.

[0017] Figure 2 This is a three-dimensional view showing the unfolded hook.

[0018] Figure 3 This is an explanatory diagram showing the shaft portion of the hook.

[0019] Figure 4 It is the hook and clasp Figure 1 The sectional view shown is along line IV-IV.

[0020] Figure 5 It is the hook and the Figure 4 A cross-sectional view showing the same cross section and the manufacturing state.

[0021] Figure 6 This is an explanatory diagram showing the manufacturing sequence of the hooks.

[0022] Figure 7 This is an explanatory diagram showing the mold used for injection molding of the hook component of the hook.

[0023] Figure 8 This is an explanatory diagram showing the mold used for injection molding of the retaining component of the hook.

[0024] Figure 9 This is an explanatory diagram showing the mold used for injection molding of the retaining member component.

[0025] Figure 10 This is a cross-sectional view of the mold used for injection molding of the retaining member. Detailed Implementation

[0026] [Structure of this embodiment]

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0028] exist Figure 1 and Figure 2 In this embodiment, the hook 1 of the rotating connecting device includes: a resin hook member 2 as a first component, which can be fitted with a first connected body such as a bag (not shown); and a resin retainer member 4 as a second component, which can be fitted with a second connected body such as a belt (not shown). The hook member 2 and the retainer member 4 are configured to be able to rotate relative to each other in the R direction about the axis C.

[0029] In the following description, the X-axis direction is defined as the up-down direction of hook 1, the Y-axis direction, which is orthogonal to the X-axis direction, is defined as the left-right direction of hook 1, and the Z-axis direction, which is orthogonal to both the X-axis and Y-axis directions, is defined as the thickness direction of hook 1. The axial direction of the axis C is along the X-axis direction.

[0030] The hook member 2 includes: a hook body 21 for hooking a first connected object; a shaft portion 23 (neck) formed to project upward from an opposing surface 211 of the hook body 21 opposite to the retaining member 4; and an opening / closing member 24 mounted to the hook body 21 in a manner that allows the hook opening 22 of the hook body 21 to be opened and closed. In this embodiment, the hook body 21 and the shaft portion 23 are integrally injection molded from POM (polyaldehyde). The portion of the hook body 21 continuous with the shaft portion 23 is formed to be thicker in the Z-axis direction, improving the connection strength with the retaining member 4. The opening / closing member 24 is formed from a fitting.

[0031] like Figure 3 As shown, the shaft portion 23 has: a base end portion 26 on the side of the hook body 21; and a top end portion 27 (head) which is located above the base end portion 26, and the shaft portion 23 is formed as a solid in a non-reducible manner.

[0032] The axial dimension L1 of the shaft portion 23 (in this embodiment, the dimension in the X-axis direction) is longer than the axial dimension L2 of the bearing portion 43 (in this embodiment, the dimension in the X-axis direction) discussed later by an amount corresponding to the axial dimension L3 of the base end portion 26 (in this embodiment, the dimension in the X-axis direction). (Refer to...) Figure 3 and Figure 4Therefore, the shaft portion 23 can move relative to the bearing portion 43 in the X-axis direction by an amount corresponding to the axial dimension L3 of the base end portion 26.

[0033] The shaft portion 23 has a portion of the same shape as the bearing portion 43 (except for the base end portion 26). The radial dimension of the shaft portion 23 in the width direction orthogonal to the axial direction increases from the base end portion 26 toward the top end portion 27. The radial dimension L4 of the top end portion 27 of the shaft portion 23 is larger than the radial dimension L5 of the base end portion 26 of the shaft portion 23 (see reference). Figure 3 In this embodiment, the shaft portion 23 is formed in a generally frustum shape, and therefore, its diameter expands from the base end portion 26 toward the top end portion 27.

[0034] The top end 27 of the shaft portion 23 has a continuous circumferential outer surface 271 in the R direction (circumferential direction) centered on the axis C. A first guide portion 30 is formed on the circumferential outer surface 271, extending obliquely in the R direction with one end 28 positioned differently in the X-axis direction from the other end 29. In this embodiment, the first guide portion 30 is slightly shorter than a full circle around the top end 27 and is formed as an externally threaded shape protruding radially from the shaft portion 23. The other end 29 is located above the first end 28 and is flush with the top surface 251 of the shaft portion 23. The top end 27 engages axially with the retaining member 4, connecting the hook member 2 and the retaining member 4 so that they are not separated.

[0035] The base end portion 26 is formed into a cylindrical shape along the X-axis direction. The shaft portion 23 is used to allow the hook 1 to... Figure 5 The manufacturing state shown (the state before it becomes the usage state) becomes Figure 4 In the usage state shown, it can move relative to the bearing part 43 in the X-axis direction by an amount corresponding to the aforementioned axial dimension L3.

[0036] The retainer component 4 is integrally injection molded from POM and has: a retainer body 41; a mounting hole 42 through which a second connected body passes; and a bearing portion 43 for connection with the aforementioned shaft portion 23, and is formed in a non-expandable manner.

[0037] The retaining body 41 has a facing surface 411 that faces the facing surface 211 of the hook body 21 in the X-axis direction. For example... Figure 4 As shown, in the usage state of hook 1, the opposing surface 411 abuts against the opposing surface 211 in the X-axis direction. In the manufacturing state of hook 1 (the state before it becomes usable), as... Figure 5 As shown, the opposing surface 411 is separate from the opposing surface 211. The portion of the retaining member 4 with the bearing portion 43 is thicker in the Z-axis direction, which improves the connection strength with the hook member 2.

[0038] Mounting hole 42 is formed on retainer body 41. Mounting hole 42 has a first hole forming surface 421 and a second hole forming surface 422 along the Y-axis direction, and a continuous left-right surface 423 (in this embodiment, a surface along the X-axis direction) that is continuous with the first hole forming surface 421 and the second hole forming surface 422. Compared with the second hole forming surface 422, the first hole forming surface 421 is closer to the hook member 2.

[0039] like Figure 4 , Figure 5 As shown, the bearing portion 43 is provided with a complementary shape (same shape portion) except for the base end portion 26 of the shaft portion 23, and has a continuous circumferential inner surface 431 in the R direction. The bearing portion 43 has openings in the aforementioned opposing surface 411 and the first hole forming surface 421, and the opening in the first hole forming surface 421 is formed to be larger than the opening in the opposing surface 411. In this embodiment, the bearing portion 43 is formed in a generally frustum shape, and therefore, the diameter is expanded from one end portion 46 on the hook member 2 side toward the other end portion 47 that is farther away from the hook member 2 than that end portion 46.

[0040] At the other end 47 of the bearing portion 43, a second guide periphery 50 is formed in a complementary internal thread shape to engage with the first guide periphery 30. The second guide periphery 50 extends obliquely in the R direction centered on the axis C, with one end located at a different position in the X-axis direction than the other end. In this embodiment, the second guide periphery 50 is formed by a slight deviation in length from completing one revolution around the other end 47, and is recessed radially in the bearing portion 43. The other end of the second guide periphery 50 is located higher than the first end and is flush with the first hole forming surface 421 (illustration omitted).

[0041] The aforementioned hook member 2 and retaining member 4 constitute a rotating connection structure that can rotate relative to each other in the R direction. Furthermore, in this embodiment, the tensile strength in a tensile test where the hook member 2 and retaining member 4 are stretched in the separating direction in the X-axis direction is 200 N or more.

[0042] [The manufacturing sequence of hooks and clasps]

[0043] The manufacturing sequence of the aforementioned hook 1 will be described below. Hook 1 is generally manufactured according to... Figure 6 Manufacturing proceeds from left to right in the order indicated by the arrows.

[0044] First, use Figure 7 The molds 61 and 62 shown are used to integrally injection mold the primary molded part 60 (in this embodiment, the hook member 2 (excluding the opening and closing member 24)). Specifically, POM at 220°C to 180°C is injected into the space formed by the molds 61 and 62, and the mold is removed when the surface temperature of the primary molded part 60 is 90°C to 100°C.

[0045] Next, use Figures 8-10 The secondary molded part 70 (in this embodiment, the retaining member 4) is integrally injection molded using the half-and-half molds 71 ​​and 72. The surface of the primary molded part 60 is cured during the injection molding of the secondary molded part 70. Specifically, the primary molded part 60 is placed in the space formed by the molds 71 ​​and 72, POM is injected at 160°C to 170°C, and the secondary molded part 70 is allowed to cure. In this embodiment, the time from the injection of POM into the space formed by the molds 61 and 62 (injection molding of the primary molded part 60) to the injection of POM into the space formed by the molds 71 ​​and 72 (injection molding of the secondary molded part 70) is approximately 30 seconds.

[0046] At this time, the opposing surfaces 211 and 411 are separated from each other in the X-axis direction as described above, but the shaft portion 23 (except for the base end portion 26) and the bearing portion 43 are as described above. Figure 5 As shown, the first guide periphery 30, which is in the shape of an external thread, and the second guide periphery 50, which is in the shape of an internal thread, are in a mutually abutting connection state and are threaded together.

[0047] Next, while rotating the hook member 2 and the retaining member 4 relative to each other in the R direction, causing the first guide circumference 30 to be slidably guided by the second guide circumference 50, the shaft portion 23 is initially moved upward relative to the bearing portion 43 by an amount corresponding to the axial dimension L3, becoming Figure 4 The state shown. Through this initial movement, the first guide portion 30 disengages from the second guide portion 5, and the top end portion 27 of the shaft portion 23 protrudes upward from the bearing portion 43, engaging axially with the bearing portion 43 to maintain a rotatable connection between the hook member 2 and the retaining member 4. The base end portion 26 of the shaft portion 23... Figure 5 The state shown becomes Figure 4 In the state shown (the state covered by the bearing portion 43), the top end portion 27 protrudes upward relative to the bearing portion 43 by a corresponding amount (equivalent to the axial dimension L3) as the base end portion 26 is covered by the bearing portion 43. Furthermore, the portion of the shaft portion 23 other than the base end portion 26 and the top end portion 27 remains covered by the bearing portion 43 before and after the relative rotation of the hook member 2 and the retaining member 4.

[0048] The base end portion 26 of the shaft portion 23 slidably abuts against one end portion 46 of the bearing portion 43. The portion between the base end portion 26 and the top end portion 27 of the shaft portion 23 is arranged at a distance from the bearing portion 43 along a plane orthogonal to the X-axis direction. Furthermore, the axial clearance between the hook member 2 and the retaining member 4 is less than 0.5 mm, and in this embodiment, the opposing surfaces 211 and 411 slidably abut against each other. Additionally, the radial clearance between the portion of the bearing portion 43, excluding the portion of the same shape as the top end portion 27 of the shaft portion 23, and the shaft portion 23 is less than 0.5 mm.

[0049] Thus, the hook member 2 and the retaining member 4 constitute a rotating linkage structure that can rotate relative to each other in the R direction.

[0050] [Variation Example]

[0051] In the embodiment described, the axial dimension L1 of the shaft portion 23 is longer than the axial dimension L2 of the bearing portion 43. The shaft portion 23 is configured to be movable relative to the bearing portion 43 in the axial direction, but is not limited to this. As long as the shaft portion 23 can rotate relative to the bearing portion 43 in the R direction, the axial dimensions L1 and L2 can also be approximately equal in length.

[0052] In the embodiment, the shaft portion 23 is formed in a frustum shape with a width direction that intersects the axial direction, increasing from the base end portion 26, which is continuous with the one-piece molded body (hook body 21), toward the top end portion 27. However, it is also possible that the shaft portion 23 is not formed in the R direction gap between the shaft portion 23 and the bearing portion 43, and is formed into other shapes without increasing dimensions.

[0053] In the embodiment described, a first guide periphery 30 is formed at the top end 27 of the shaft portion 23 and a second guide periphery 50 is formed at the bearing portion 43, but the first guide periphery 30 and the second guide periphery 50 may not be formed.

[0054] In the described embodiment, the hook body 21, the shaft portion 23, and the retaining member 4 are integrally injection molded from POM. However, this is not a limitation; the hook body 21 and the shaft portion 23 may also be integrally injection molded from POM or PA (polyamide), and the retaining member 4 may also be integrally injection molded from POM, PA, or ABS (a copolymer resin of acrylonitrile, butadiene, and styrene). Alternatively, the hook body 21 and the shaft portion 23 may be integrally injection molded from POM, PA, or ABS, and the retaining member 4 may also be integrally injection molded from POM or PA. For example, the hook body 21 and the shaft portion 23 may be integrally injection molded from POM, and the retaining member 4 may be integrally injection molded from PA; or the hook body 21 and the shaft portion 23 may be integrally injection molded from PA, and the retaining member 4 may be integrally injection molded from POM. Furthermore, it is preferable to appropriately combine the materials of the hook body 21 and the shaft portion 23 with the materials of the retaining member 4.

[0055] In the embodiment described above, a rotary connecting device is configured such that the hook member 2 having the shaft portion 23 is configured as the first member and the retaining member 4 having the bearing portion 43 is configured as the second member. However, alternatively, a rotary connecting device may also be configured such that the retaining member 4 having the shaft portion 23 is configured as the first member and the hook member 2 having the bearing portion 43 is configured as the second member.

[0056] In the described embodiment, at least in the rotatable state of the shaft portion 23 relative to the bearing portion 43, the axial clearance between the hook member 2 and the retaining member 4 is less than 0.5 mm, but this is not a limitation; the axial clearance may also be designed to be 0.5 mm or more. Furthermore, the radial clearance between the portion of the bearing portion 43, excluding the portion of the same shape as the top end portion 27 of the shaft portion 23, and the shaft portion 23 is less than 0.5 mm, but this is not a limitation; the radial clearance may also be designed to be 0.5 mm or more.

[0057] In the embodiment described, the top end portion 27 of the shaft portion 23 is solid, has a continuous circumferential outer surface 271 in the R direction, and is formed in a non-reducible manner. The bearing portion 43 has a continuous circumferential inner surface 431 in the R direction and is formed in a non-expandable manner. However, it is not limited to this. It is also possible to appropriately change the shape within the range of the connection state between the retaining hook member 2 and the retaining member 4, and form the shaft portion 23 in a reduceable manner. In addition, the bearing portion 43 is formed in an expandable manner.

[0058] In the described embodiment, the hook 1 is described as a rotating connecting device, but it is not limited to the hook 1 as long as it constitutes the aforementioned rotating connecting structure. For example, it could also be a zipper pull, which serves as a connecting structure between the zipper pull and the main body, constituting the aforementioned rotating connecting structure.

[0059] [Summary of the Invention]

[0060] The rotary connection structure of the present invention is a rotary connection structure in which a primary molded part and a secondary molded part formed by resin injection molding are rotatably connected to each other. The primary molded part is provided with a shaft portion, and the secondary molded part is provided with a bearing portion connected to the shaft portion. The shaft portion is configured to be rotatable by moving from an abutting connection state relative to the bearing portion.

[0061] According to the rotary linkage structure of the present invention, the shaft portion is in an abutting connection state before moving relative to the bearing portion. Therefore, after resin injection molding, the labor and time required for manual assembly of the primary and secondary molded parts are eliminated. Furthermore, since the shaft portion, in the abutting connection state with the bearing portion, can rotate by moving relative to the bearing portion, there is no need to pre-set a gap (initial gap) between the shaft portion and the bearing portion, and the clearance between the shaft portion and the bearing portion can be reduced accordingly, eliminating the need for setting this initial gap.

[0062] In the rotary linkage structure of the present invention, the axial dimension of the shaft portion may be longer than the axial dimension of the bearing portion, and the shaft portion may be configured to be movable relative to the bearing portion in the axial direction.

[0063] With this structure, the shaft can be made rotatable by moving the shaft relative to the bearing in the axial direction.

[0064] In the rotary linkage structure of the present invention, the primary molded object may also have a primary molded object body with the shaft portion protruding therefrom, and the dimension of the shaft portion in the width direction intersecting the axial direction increases from the base end continuous with the primary molded object body toward the top end.

[0065] With this structure, by moving the shaft relative to the bearing in the axial direction, a gap can be formed between the shaft and the bearing. By forming this gap, the shaft can rotate more smoothly relative to the bearing.

[0066] In the rotary linkage structure of the present invention, the shaft portion may also be formed as a frustum shape that expands in diameter from the base end portion toward the top end portion.

[0067] In the rotary linkage structure of the present invention, a first guide periphery may be formed at the top end of the shaft portion, the first guide periphery extending obliquely in a circumferential direction centered on the axis of the shaft portion such that one end is located at a different position in the axial direction from the other end, and a second guide periphery is formed in the bearing portion in a complementary shape such that it can fit into the first guide periphery.

[0068] According to this structure, although the shaft and bearing are in abutting connection during resin injection molding of the secondary molded part, the shaft can be set to a state in which it can be easily rotated relative to the bearing by the relative rotation of the shaft and bearing and by guiding the axial movement of the shaft relative to the bearing using the first guide periphery and the second guide periphery.

[0069] In addition, a first guide periphery is provided at the top end of the shaft, so even if the shaft is set to a state that can rotate relative to the bearing portion, axial wobble of the shaft relative to the bearing portion can be suppressed.

[0070] In the rotary linkage structure of the present invention, one of the primary molded material and the secondary molded material may be made of POM or PA, and the other of the primary molded material and the secondary molded material may be made of POM, PA or ABS.

[0071] The rotary coupling device of the present invention is a rotary coupling device composed of a resin injection molded hook member and a retaining member, wherein the hook member is provided with a shaft portion formed in a non-reducible manner, and the retaining member is provided with a bearing portion formed in a non-expandable manner. The shaft portion is configured to be rotatable by moving from an abutting connection state relative to the bearing portion. In the state in which the shaft portion can rotate relative to the bearing portion, the axial clearance between the hook member and the retaining member is smaller than 0.5 mm.

[0072] The rotary coupling device according to the present invention can achieve the same effect as the aforementioned rotary coupling structure. Moreover, compared with the case where, for example, grooves are formed in the bearing or bearing portion to allow for diameter reduction or expansion, the connection strength between the first member and the second member can be improved.

[0073] According to the rotary coupling device of the present invention, the radial dimension of the top end of the shaft is larger than the radial dimension of the base end of the shaft, the shaft has a portion of the same shape as the bearing portion, and in the rotatable state of the shaft relative to the bearing portion, the radial clearance between the portion of the bearing portion other than the portion of the same shape as the top end and the shaft portion is smaller than 0.5 mm.

[0074] In the rotary connecting device of the present invention, the top end of the shaft portion of the hook member may be solid and have a continuous circumferential outer surface in the circumferential direction, and the bearing portion of the retaining member may have a continuous circumferential inner surface in the circumferential direction.

[0075] In the rotary coupling device of the present invention, the axial dimension of the shaft portion may be longer than the axial dimension of the bearing portion, and the shaft portion may be configured to be movable relative to the bearing portion in the axial direction.

[0076] With this structure, the shaft can be made rotatable by moving the shaft relative to the bearing in the axial direction.

[0077] In the rotary coupling device of the present invention, the hook member may also have a hook body on which the shaft portion is formed protrudingly, and the dimension of the shaft portion in the width direction intersecting the axial direction increases from the base end continuous with the hook body towards the top end.

[0078] With this structure, by moving the shaft relative to the bearing in the axial direction, a gap can be formed between the shaft and the bearing. By forming this gap, the shaft can rotate more smoothly relative to the bearing.

[0079] In the rotary coupling device of the present invention, the shaft portion may also be formed as a frustum shape that expands in diameter from the base end portion toward the top end portion.

[0080] In the rotary coupling device of the present invention, a first guide periphery may be formed at the top end of the shaft portion, the first guide periphery extending obliquely in a circumferential direction centered on the axis of the shaft portion such that one end is located at a different position in the axial direction from the other end, and a second guide periphery is formed in the bearing portion in a complementary shape such that it can fit into the first guide periphery.

[0081] According to this structure, although the shaft and bearing are in abutting connection during resin injection molding of the main body of the retainer, the shaft can be set to a state in which it can be easily rotated relative to the bearing by the relative rotation of the shaft and bearing and by guiding the axial movement of the shaft relative to the bearing using the first guide circumference and the second guide circumference.

[0082] In addition, a first guide periphery is provided at the top end of the shaft, so even if the shaft is set to a state that can rotate relative to the bearing portion, axial wobble of the shaft relative to the bearing portion can be suppressed.

[0083] In the rotary coupling device of the present invention, one of the hook member and the retaining member may be made of POM or PA, and the other of the hook member and the retaining member may be made of POM, PA or ABS.

[0084] In the rotary coupling device of the present invention, the hook member forming the shaft portion may be resin injection molded, and after the surface of the hook member is cured, the retaining member may be resin injection molded in such a way that a bearing portion is formed in an abutting connection state relative to the shaft portion. After the hook member and the retaining member are cured, the shaft portion is initially moved relative to the bearing portion to set it to a rotatable state.

[0085] In the method of constructing the rotary linkage structure of the present invention, a primary molded article forming a shaft portion is resin injection molded, and after the surface of the primary molded article is cured, a secondary molded article is resin injection molded in such a way that a bearing portion is formed in an abutting connection state relative to the shaft portion. After the primary molded article and the secondary molded article are cured, the shaft portion is initially moved relative to the bearing portion to set it to a rotatable state.

[0086] The aforementioned rotary linkage structure can be constructed using the method of constructing the rotary linkage structure according to the present invention.

[0087] Explanation of reference numerals in the attached figures

[0088] 1. Hook (rotary connector); 2. Hook component (first component); 21. Hook body; 211, 411. Opposing surfaces; 22. Hook opening; 23. Shaft; 24. Opening / closing component; 251. Top surface; 26. Base end; 27. Top end; 271. Circumferential outer surface; 28. One end; 29. ​​The other end; 30. First guide perimeter; 4. Retaining component (second component); 41. Retaining body; 42. Mounting hole; 421. First hole forming surface; 422. Second hole forming surface; 423. Continuous surface; 43. Bearing part; 431. Circumferential inner surface; 46. One end; 47. The other end; 50. Second guide perimeter; 60. Primary formed part; 61, 62, 71, 72. Mold; 70. Secondary formed part; C. Shaft; L1~L3. Axial dimension; L4, L5. Radial dimension.

Claims

1. A rotary linkage structure, comprising a primary molded part (60) and a secondary molded part (70) formed by resin injection molding, which are rotatably connected to each other, wherein, A shaft portion (23) is provided on the one-piece molded part (60). The secondary molded part (70) is provided with a bearing part (43) that is connected to the shaft part (23). The shaft (23) is configured to rotate by moving from an abutting connection state relative to the bearing (43). A first guide periphery (30) is formed at the top end (27) of the shaft portion (23). The first guide periphery (30) is formed as an external thread shape that extends obliquely in the circumferential direction centered on the axis (C) of the shaft portion (23) with one end (28) located at a different position in the axial direction than the other end (29). A second guide periphery (50) is formed in the bearing portion (43), and the second guide periphery (50) is formed in a complementary internal thread shape so as to fit into the first guide periphery (30). In the rotatable state after the shaft portion (23) moves relative to the bearing portion (43), the opposing surfaces (211) of the primary molding (60) and the opposing surfaces (411) of the secondary molding (70) abut against each other, and the top end portion (27) is disposed protruding upward from the other end (47) of the bearing portion (43) and engages with the other end (47) in the axial direction.

2. The rotary linkage structure according to claim 1, wherein, The axial dimension (L1) of the shaft portion (23) is longer than the axial dimension (L2) of the bearing portion (43). The shaft (23) is configured to be movable relative to the bearing (43) in the axial direction.

3. The rotary linkage structure according to claim 1 or 2, wherein, The one-piece molded object (60) has a one-piece molded object body (21) on which the shaft portion (23) is formed protrudingly. The dimension of the shaft portion (23) in the width direction intersecting the axial direction increases from the base end portion (26) which is continuous with the one-piece molded body (21) toward the top end portion (27).

4. The rotary linkage structure according to claim 3, wherein, The shaft portion (23) is formed into a frustum shape that expands in diameter from the base end portion (26) toward the top end portion (27).

5. The rotary linkage structure according to claim 1 or 2, wherein, One of the primary molded product (60) and the secondary molded product (70) is made of POM or PA. The other of the primary molded part (60) and the secondary molded part (70) is made of POM, PA or ABS.

6. A rotary coupling device, comprising a resin injection-molded hook component (2) and a retaining component (4) forming a rotary coupling device (1), wherein, The hook member (2) is provided with a shaft portion (23) formed in a non-reducible manner. The retaining member (4) is provided with a bearing portion (43) formed in a non-expandable manner. The shaft (23) is configured to rotate by moving from an abutting connection state relative to the bearing (43). In the rotatable state of the shaft portion (23) relative to the bearing portion (43), the axial clearance between the hook member (2) and the retaining member (4) is less than 0.5 mm. A first guide periphery (30) is formed at the top end (27) of the shaft portion (23). The first guide periphery (30) is formed as an external thread shape that extends obliquely in the circumferential direction centered on the axis (C) of the shaft portion (23) with one end (28) located at a different position in the axial direction than the other end (29). A second guide periphery (50) is formed in the bearing portion (43), and the second guide periphery (50) is formed in a complementary internal thread shape so as to fit into the first guide periphery (30). In the rotatable state after the shaft (23) has moved relative to the bearing (43), the opposite face (211) of the hook member (2) abuts against the opposite face (411) of the retaining member (4), and the top end (27) is arranged to protrude upward from the other end (47) of the bearing (43) and engages with the other end (47) in the axial direction.

7. The rotary coupling device according to claim 6, wherein, The radial dimension (L4) of the top end portion (27) of the shaft portion (23) is larger than the radial dimension (L5) of the base end portion (26) of the shaft portion (23). The shaft portion (23) has a portion of the same shape as the bearing portion (43). In the rotatable state of the shaft portion (23) relative to the bearing portion (43), the radial clearance between the portion of the bearing portion (43) other than the portion of the same shape as the top end portion (27) and the shaft portion (23) is smaller than 0.5 mm.

8. The rotary coupling device according to claim 6 or 7, wherein, The top end (27) of the shaft portion (23) of the hook member (2) is solid and has a continuous circumferential outer surface (271) in the circumferential direction. The bearing portion (43) of the retaining member (4) has a continuous circumferential inner surface (431) in the circumferential direction.

9. The rotary coupling device according to claim 6 or 7, wherein, The axial dimension (L1) of the shaft portion (23) is longer than the axial dimension (L2) of the bearing portion (43). The shaft (23) is configured to be movable relative to the bearing (43) in the axial direction.

10. The rotary coupling device according to claim 6 or 7, wherein, The hook component (2) has a hook body (21) with the shaft portion (23) protrudingly formed thereon. The dimension of the shaft portion (23) in the width direction intersecting the axial direction increases from the base end portion (26) which is continuous with the hook body (21) toward the top end portion (27).

11. The rotary coupling device according to claim 10, wherein, The shaft portion (23) is formed into a frustum shape that expands in diameter from the base end portion (26) toward the top end portion (27).

12. The rotary coupling device according to claim 6 or 7, wherein, One of the hook member (2) and the retaining member (4) is made of POM or PA. The other of the hook member (2) and the retainer member (4) is made of POM, PA or ABS.

13. The rotary coupling device according to claim 6 or 7, wherein, The hook member (2) forming the shaft portion (23) is resin injection molded. After the surface of the hook member (2) is cured, the retaining member (4) is resin injection molded in such a way that a bearing portion (43) is formed in an abutting connection state relative to the shaft portion (23). After the hook member (2) and the retaining member (4) are cured, the shaft (23) is moved relative to the bearing (43) for the first time and set to a rotatable state.

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