Buckle

Abstract

The invention provides a buckle. A buckle (1) is provided with a plug (10) and a socket (20) into which the plug is inserted, and the plug is provided with: a base part (11) to which an object to be connected can be mounted; leg parts (121A, 121B) protruding from the base part in the + X direction of the plug and facing each other in the Y direction; clamping parts (13A, 13B) which are arranged on the leg parts in a manner of being capable of being clamped with the socket and can be released from the socket through elastic deformation of the leg parts in the Y direction; rope hanging parts (14A, 14B) disposed between the leg part (121A) and the leg part (121B), the operation ropes (30) being hung on the rope hanging parts; a connecting part (15A) for connecting the leg part (121A) and the lanyard part (14A); and a connecting part (15B) for connecting the leg part (121B) and the lanyard part (14B), the lanyard part (14A) and the lanyard part (14B) being arranged at different positions in the Z direction.

Description

Technical Field The invention relates to a belt buckle whose release operation is performed by an operating rope. Background Art Conventionally, as a buckle for connecting two connected bodies in a detachable manner, there is a buckle having a socket and a plug inserted into and engaged with the socket. In addition, as one of such buckles, there is a buckle that can use a cord-like operating cord to release the engagement between the socket and the plug (see, for example, Document 1: U.S. Patent No. 8522410). In the buckle disclosed in Document 1, the plug includes: a base portion on which a connected body is mounted; a pair of legs protruding from the base portion and engageable with a socket; and a bridge portion that connects the top ends of the pair of legs to each other, with an operating cord wound around the center of the bridge portion. When the operating cord is pulled, the bridge portion is elastically deformed in a folded manner, and the pair of legs are elastically deformed in a manner that they approach each other. As a result, the engagement between the pair of legs and the socket is released, and the plug is unplugged from the socket. However, the buckle of Document 1 has a problem in that it is difficult to increase the strength of the bridge portion that performs the above-mentioned elastic deformation, and the bridge portion is easily damaged by the force applied from the operating cord. Summary of the invention The present invention aims to provide a buckle which can be released by an operating cord and has improved strength.

[0001] A buckle according to one aspect of the present invention comprises a plug and a socket into which the plug is inserted, wherein the plug comprises: a base on which a connected body can be mounted; a first leg and a second leg which protrude from the base in an insertion direction of the plug and are opposed to each other in a width direction orthogonal to the insertion direction; a first engaging portion which is arranged on the first leg in such a manner as to be engageable with the socket and can be released from the socket by elastic deformation of the first leg in the width direction; and a second engaging portion which is arranged on the second leg in such a manner as to be engageable with the socket and can be released from the socket by elastic deformation of the first leg in the width direction. The second leg can be released from the socket by elastic deformation in the width direction; the first hanging rope part and the second hanging rope part are arranged between the first leg and the second leg, and the operation rope is hung on the first hanging rope part and the second hanging rope part respectively; the first connecting part connects the first leg and the first hanging rope part; and the second connecting part connects the second leg and the second hanging rope part, and the first hanging rope part and the second hanging rope part are arranged at different positions in the thickness direction which is respectively orthogonal to the insertion direction and the width direction.

[0002] According to the above [1], preferably, the first hanging rope portion protrudes from the first connecting portion in the width direction or the insertion direction, and the second hanging rope portion protrudes from the second connecting portion in the width direction or the insertion direction.

[0003] According to the above [1] or [2], preferably, the first hanging rope portion and the second hanging rope portion have through holes, the through holes respectively penetrate the first hanging rope portion and the second hanging rope portion in the thickness direction, and are arranged in a manner that they at least partially overlap each other in the thickness direction.

[0004] According to the above [3], preferably, the first cord hook portion and the second cord hook portion have cord contact edges facing a region where the through holes overlap each other in the thickness direction in the insertion direction.

[0005] According to the above [4], preferably, the through hole of at least one of the first and second rope hook parts exposes the rope contact edge of the other of the first and second rope hook parts in the thickness direction.

[0006] According to the above [4] or the above [5], it is preferred that the rope abutment edge of the first rope hanging part is inclined relative to the width direction in a manner that the farther away from the first leg in the width direction, the farther toward the removal direction which is the opposite direction of the insertion direction, and the rope abutment edge of the second rope hanging part is inclined relative to the width direction in a manner that the farther away from the second leg in the width direction, the farther toward the removal direction.

[0007] According to any one of the above [4] to the above [6], it is preferred that the rope contact edge of the first rope hanging part is arranged in a manner that the distance from the first leg in the width direction is longer than the distance from the rope contact edge of the second rope hanging part to the first leg, and the rope contact edge of the second rope hanging part is arranged in a manner that the distance from the second leg in the width direction is longer than the distance from the rope contact edge of the first rope hanging part to the second leg.

[0008] According to any one of the above [1] to [7], preferably, the socket has a shell portion for accommodating the plug, and the shell portion has: an opening portion for inserting the plug; and one or more slits extending from the opening portion in the insertion direction, and exposing the through hole from the shell portion in the thickness direction. The present invention can provide a buckle which can be released by using an operating cord and has improved strength. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a perspective view showing a buckle according to an embodiment of the present invention. Figure 2 It is a front view which shows the buckle of the said embodiment. Figure 3 It is a front view showing the plug of the above embodiment. Figure 4 It is a side view showing the plug of the above embodiment. Figure 5 yes Figure 3 A partial enlarged view of . Figure 6 yes Figure 3 Sectional view taken along line VI-VI. Figure 7 It is a cross-sectional view showing the socket according to the above embodiment. Figure 8 It is a diagram for explaining the engaged state of the plug according to the above embodiment. Fig. 9 It is a diagram for explaining a disengaged state of the plug according to the embodiment. Fig.10 yes Fig. 9 A partial enlarged view of the plug. Fig.11 It is a front view showing the plug of the first modified example. Fig.12 It is a front view showing the socket of the second modified example. DETAILED DESCRIPTION based on Figures 1 to 10 An embodiment of the present invention will be described. like Figure 1 As shown in FIG. 1 , the buckle 1 of this embodiment includes a plug 10 and a socket 20 into which the plug 10 is inserted. A connected object is installed in each of the plug 10 and the socket 20, and the two connected objects are connected to each other by the plug 10 and the socket 20 being connected. As the connected object, any long object such as a belt, a tape, or a rope can be cited. Figure 2 As shown in FIG. 1 , an operation cord 30 for release operation is attached to the plug 10. The operation cord 30 may be any long object such as a cord body. In the following description, the length direction of the socket 20 and the plug 10 is set as the X direction, the width direction (left-right direction) of the buckle 1 is set as the Y direction, and the thickness direction (up-down direction) of the buckle 1 is set as the Z direction. The X direction, the Y direction, and the Z direction are orthogonal to each other. In addition, the insertion direction of the plug 10 relative to the socket 20 in the X direction is set as the +X direction, and the direction opposite to the insertion direction of the plug 10 (i.e., the removal direction) is set as the -X direction. In addition, the direction toward one side of the Y direction is set as the +Y direction, and the direction toward the other side of the Y direction is set as the -Y direction. Similarly, the direction toward one side of the Z direction is set as the +Z direction, and the direction toward the other side of the Z direction is set as the -Z direction. (Structure of plug 10) Reference Figure 1 to Figure 6 Next, the structure of the plug 10 will be described. like Figure 3 As shown, the plug 10 includes a base 11 to which a connected body can be mounted, and a first leg unit 12A and a second leg unit 12B connected to the base 11 at different positions in the Y direction. The plug 10 of this embodiment is integrally formed of, for example, a synthetic resin material. The base 11 includes rods 111 to 113 arranged along the Y direction and a pair of side walls 114A and 114B connecting the rods 111 to 113 at both ends in the Y direction. There is a gap between the rods 111 to 113 adjacent to each other along the X direction for the connected body to pass through, and the connected body is attached to the base 11 by being wound around at least one of the rods 111 and 112. The first leg unit 12A and the second leg unit 12B have a shape that is rotationally symmetrical by 180 degrees about a virtual center line C that passes through the center of the plug 10 and is parallel to the X direction. Specifically, the first leg unit 12A includes: a leg 121A (corresponding to the first leg), which protrudes from the base 11 in the +X direction; a snap-fit ​​portion 13A (corresponding to the first snap-fit ​​portion), which is provided in the leg 121A to be snap-fit ​​with the socket 20; a rope portion 14A (corresponding to the first rope portion), which is supported by the leg 121A, and the operating rope 30 is hung on the rope portion 14A; and a connecting portion 15A (corresponding to the first connecting portion), which connects the leg 121A and the rope portion 14A. Similarly, the second leg unit 12B comprises: a leg 121B (corresponding to the second leg), which protrudes from the base 11 in the +X direction; a snap-fitting portion 13B (corresponding to the second snap-fitting portion), which is arranged in the center of the leg 121B and can be snapped with the socket 20; a rope portion 14B (corresponding to the second rope portion), which is supported by the leg 121B, and the operating rope 30 is hung on the rope portion 14B; and a connecting portion 15B (the second connecting portion), which connects the leg 121B and the rope portion 14B. The following describes the specific structures of the first leg unit 12A and the second leg unit 12B, mainly the structure of the first leg unit 12A. The structure of the second leg unit 12B is similar to the description of the first leg unit 12A except that the positive and negative directions of the Z and Y directions are opposite. The leg portion 121A is connected to the -Y side end portion of the base portion 11 and extends from the base portion 11 in the +X direction. The leg portion 121A includes an elastic deformation portion 122 formed to be elastically deformable in the Y direction, a top portion 123 of the leg portion 121A located closer to the +X side than the elastic deformation portion 122, and an intermediate portion 124 located between the elastic deformation portion 122 and the top portion 123. The top portion 123 is formed so that the thickness in the Z direction is smaller than the thickness of the elastic deformation portion 122 and the intermediate portion 124 in the Z direction. The engaging portion 13A is provided at the top end portion 123 of the leg portion 121A. Figure 4 As shown in FIG. 1 , the engaging portion 13A includes a first protrusion 131 protruding from the top end 123 of the leg 121A in the +Z direction and a second protrusion 132 protruding from the top end 123 of the leg 121A in the -Z direction. The first protrusion 131 and the second protrusion 132 are respectively formed with abutment surfaces 133 facing the -X direction (see FIG. 1 ). Figure 3 ). In addition, if Figure 3 As shown in FIG. 1 , a wrong insertion preventing protrusion 134 is provided on the first protrusion 131, which protrudes inward in the Y direction. The wrong insertion preventing protrusion 134 provided on the first protrusion 131 of the engaging portion 13A and the wrong insertion preventing protrusion 134 provided on the first protrusion 131 of the engaging portion 13B face each other with a gap in the Z direction therebetween. Thus, each wrong insertion preventing protrusion 134 functions as a guide when inserting the plug 10 into the socket 20, and can prevent the plug 10 from being wrongly inserted into the socket 20. The hanging rope portion 14A is disposed between the leg 121A of the first leg unit 12A and the leg 121B of the second leg unit 12B. The hanging rope portion 14A is connected to the top end portion 123 of the leg 121A, and is connected to the middle portion 124 of the leg 121A via the connecting portion 15A, and is connected to the +Z side of the connecting portion 15A. In addition, the hanging rope portion 14A protrudes from the connecting portion 15A in the +Y direction. The hanging rope portion 14A is a portion for hanging the operating rope 30. Specifically, the hanging rope portion 14A of the present embodiment is in the shape of a plate arranged along a plane orthogonal to the Z direction, and has a through hole 16A that penetrates in the Z direction. In addition, a notch 141 is formed at the edge of the hanging rope portion 14A facing the base 11 along the -X direction, and the shape is cut into the +X direction as it goes toward the +Y direction. In addition, a thinning portion for avoiding interference with other elements may be formed at the portion of the hanging rope portion 14A facing the -Z direction. like Figure 5 As shown, the rope hanging part 14A has a rope contact edge 142A as an edge of the hole main body region R1 discussed later facing the through hole 16A in the +X direction. The rope contact edge 142A is inclined relative to the Y direction in a manner that the more it is toward the +Y direction (that is, the farther away from the leg 121A in the Y direction), the more it is toward the -X direction. As a result, an angle θ is formed between the rope contact edge 142A and the imaginary line V parallel to the Y direction. The angle θ can be greater than 0 degrees and less than 90 degrees, and is preferably, for example, greater than 15 degrees and less than 30 degrees. like Figure 3 As shown, the connecting portion 15A connects the leg 121A and the hanging rope portion 14A at a position closer to the +X side than the elastic deformation portion 122 of the leg 121A. The connecting portion 15A extends from the leg 121A toward the hanging rope portion 14A in the +Y direction and has a substantially rectangular plate shape arranged along the X direction and the Y direction. In addition, the connecting portion 15A is arranged in a manner to fill the gap in the Y direction between the leg 121A and the hanging rope portion 14A, thereby reinforcing the strength of the hanging rope portion 14A. The Z-direction arrangement range of the connecting portion 15A is the Z-direction arrangement range of the distal end portion 123 of the leg portion 121A (see Figure 6 That is, the connection part 15A connected to the hanging rope part 14A is configured in a manner not to interfere with the hanging rope part 14B. Hereinafter, the details of the strap portions 14A and 14B of the first leg unit 12A and the second leg unit 12B will be described. like Figure 6 As shown, the hanging rope parts 14A and 14B are arranged at different positions in the Z direction. Specifically, the hanging rope part 14A is arranged at a position closer to the +Z side than the top end 123 of each leg part 121A and 121B, and the hanging rope part 14B is arranged at a position closer to the -Z side than the top end 123 of each leg part 121A and 121B. In addition, the hanging rope parts 14A and 14B are opposite to each other in the Z direction, and there is a gap in the Z direction between the hanging rope parts 14A and 14B to such an extent that they do not interfere with each other. like Figure 5 As shown in FIG. 1 , the rope parts 14A and 14B have through holes 16A and 16B partially overlapping each other in the Z direction. Figure 5 In FIG. 1 , for the sake of explanation, the edge portion of the through hole 16A is indicated by a thick line. Specifically, the through holes 16A and 16B each have an L-shaped cross-sectional shape as a cross-sectional shape orthogonal to the Z direction. Thus, the through hole 16A includes a hole main body region R1 overlapping with the through hole 16B in the Z direction and a hole expansion region R2 overlapping with the hanging rope portion 14B in the Z direction. In other words, the through hole 16A is divided into the hole main body region R1 or the hole expansion region R2 due to overlapping with the through hole 16B or overlapping with the hanging rope portion 14B. In addition, although not shown in the figure, it is assumed that the through hole 16B includes the hole main body region R1 and the hole expansion region R2 in the same manner as the through hole 16A. The through holes 16A and 16B overlap each other in their respective hole main body regions R1, thereby forming a space for the operation cord 30 (see Figure 2 ) through the rope through hole 160. The hole expansion region R2 of each through hole 16A and 16B extends from a part of the rope through hole 160 in the -X direction, and is arranged in the Y direction in a manner not to overlap in the Z direction. In addition, it is preferred that the hole expansion region R2 of the through hole 16A includes an area on the -Y side of the rope through hole 160, and the hole expansion region R2 of the through hole 16B includes an area on the +Y side of the rope through hole 160. The cord contact edge 142A of the cord hanging portion 14A faces the hole main body region R1 of the through hole 16A along the +X direction (i.e., faces the cord through hole 160). Similarly, the cord contact edge 142B of the cord hanging portion 14B faces the hole main body region R1 of the through hole 16B along the +X direction (i.e., faces the cord through hole 160). In the present embodiment, the rope abutting edges 142A and 142B do not overlap in the Z direction, but are arranged side by side in the Y direction. Specifically, the rope abutting edge 142A is arranged in a manner that the distance from the leg 121A in the Y direction is longer than the distance from the rope abutting edge 142B to the leg 121A, and the rope abutting edge 142B is arranged in a manner that the distance from the leg 121B in the Y direction is longer than the distance from the rope abutting edge 142A to the leg 121B. The hole expansion area R2 of the through hole 16A exposes the rope contact edge 142B in the +Z direction, and the hole expansion area R2 of the through hole 16B exposes the rope contact edge 142A in the -Z direction. Therefore, the rope contact edges 142A and 142B are exposed on both sides of the Z direction, respectively, and can be connected to the operation rope 30 (refer to Figure 2 ) abutment. (Structure of socket 20) Further references Figure 7 and Figure 8 The structure of the socket 20 will be described. Figure 8This is a diagram showing a combination of a cross-sectional view of the socket 20 cut at the center portion in the Z direction and a front view of the plug 10 . like Figure 1 , Figure 2 , Figure 7 as well as Figure 8 As shown, the socket 20 includes a mounting portion 21 to which a connected body can be mounted, a housing 22 provided with the mounting portion 21, and engaged portions 23A and 23B provided on the housing 22. The socket 20 of this embodiment is integrally formed of, for example, a synthetic resin material. The mounting portion 21 has a rod shape arranged along the Y direction, and both ends of the mounting portion 21 are connected to the housing portion 22. A gap through which a connected object passes exists between the mounting portion 21 and the housing portion 22, and the connected object is wound around the mounting portion 21. like Figure 1 As shown, the housing portion 22 includes: a pair of wall portions 221, 222, which are arranged opposite to each other in the Z direction; and a pair of side wall portions 223A, 223B, which are arranged opposite to each other in the Y direction. Figure 7 As shown, the housing portion 22 has a storage space S that can store the first leg unit 12A and the second leg unit 12B of the plug 10 , and an opening AP that communicates with the storage space S and opens in the −X direction. like Figure 1 As shown, the walls 221 and 222 have slits SL cut from the opening AP in the +X direction. The slits SL in the walls 221 and 222 expose the cord insertion hole 160 of the plug 10 from the housing 22 in the +Z direction (or -Z direction). The side wall portions 223A and 223B connect the two ends of the wall portions 221 and 222 in the Y direction. Figure 8 As shown, the side wall portions 223A and 223B have a hole TH penetrating the side wall portions 223A and 223B in the Y direction. The hole TH of the side wall portion 223A exposes the leg portion 121A from the housing portion 22 to the outside in the Y direction, and the hole TH of the side wall portion 223B exposes the leg portion 121B from the housing portion 22 to the outside in the Y direction. In addition, the portion of the leg portions 121A and 121B exposed from the hole TH of the housing portion 22 can be used as an operating portion for operating the leg portions 121A and 121B when the buckle 1 is released from the connection. The engaged portions 23A and 23B are arranged near the holes TH of the side wall portions 223A and 223B. Figure 7As shown in the figure, the engaged portion 23A has a pair of convex portions 231, which protrude from the inner surfaces of the wall portions 221 and 222 to the storage space S and are opposite to each other in the Z direction. Although not shown in the figure, the engaged portion 23B has a pair of convex portions 231 similarly to the engaged portion 23A, which protrude from the inner surfaces of the wall portions 221 and 222 to the storage space S and are opposite to each other in the Z direction. like Figure 8 As shown, the convex portion 231 of each of the engaged portions 23A and 23B has a guide surface 232 facing the inner side in the Y direction and a contact surface 233 facing the +Z direction. When the plug 10 is inserted into the socket 20, the guide surface 232 of each of the engaged portions 23A and 23B guides the engaging portions 13A and 13B of the plug 10 in the Z direction and pushes them inward in the Y direction. When the plug 10 is inserted into the socket 20, the contact surface 233 of each of the engaged portions 23A and 23B contacts the engaging portions 13A and 13B of the plug 10 in the X direction. As a result, the engaged portions 23A and 23B can be engaged with the engaging portions 13A and 13B of the plug 10 in the X direction. (Unlocking action of buckle 1) In the buckle 1 of this embodiment, as Figure 2 As shown, the operation cord 30 is mounted on the plug 10. In the present embodiment, the operation cord 30 is a cord body formed in a ring shape. In this case, after the bent portion 31, which is a part of the operation cord 30, passes through the cord through hole 160 of the plug 10, the other part of the operation cord 30 passes through the inner side of the bent portion 31, so that the operation cord 30 is mounted on the plug 10. Such an operation cord 30 appears to have two cord portions 32A and 32B divided by the bent portion 31. The cord portions 32A and 32B pass through the cord through hole 160 of the plug 10 and are hung on the cord hanging portions 14A and 14B, respectively. Further reference is made to Fig. 9 , Fig.10 Next, the release operation of the buckle 1 using the operating cord 30 will be described. Fig. 9 In the figure, the operation cord 30 is omitted. In this embodiment, the plug 10 is coupled to the socket 20 by engaging the engaging portions 13A and 13B of the plug 10 with the socket 20. When the plug 10 is released from the socket 20, Figure 2 In the buckle 1 shown in FIG. 1 , the user pulls the operating cord 30 in the −X direction. If the operating cord 30 is pulled in the −X direction, Fig. 9 , Fig.10 As shown, the first leg unit 12A and the second leg unit 12B of the plug 10 are respectively displaced. Specifically, if Fig.10As shown, the rope portion 32A abuts against the rope abutting edge 142A to apply an operation force F1 in the -X direction, and the rope portion 32B abuts against the rope abutting edge 142B to apply an operation force F2 in the -X direction. Fig. 9 As shown, a bending moment is applied to the first leg unit 12A and the second leg unit 12B, respectively, and the elastic deformation portion 122 of each leg 121A, 121B is elastically deformed inwardly in the Y direction, so that the top end portion 123 of each leg 121A, 121B is displaced inwardly in the Y direction in a manner of approaching each other. As a result, the contact surface 133 of each engaging portion 13A, 13B is arranged at a position closer to the inside of the Y direction than the contact surface 233 of each engaged portion 23A, 23B, and the engagement between the plug 10 and the socket 20 is released. When the legs 121A and 121B are elastically deformed inward in the Y direction, the through holes 16A and 16B overlap each other. Figure 5 The status shown changes to Fig.10 During the change, the through hole 16A maintains the state in which the rope contact edge 142B is exposed in the +Z direction, and the through hole 16B maintains the state in which the rope contact edge 142A is exposed in the -Z direction. As a result, the rope portions 32A and 32B can maintain the state of contact with the rope contact edges 142A and 142B, respectively, and the operating forces F1 and F2 can be stably applied to the rope contact edges 142A and 142B. Thereafter, when the operation forces F1 and F2 of the operation cord 30 are continuously applied in a state where the engagement between the plug 10 and the socket 20 is released, the plug 10 is unplugged from the socket 20 . Through the above steps, the unlocking operation of the buckle 1 using the operating cord 30 is completed. In the buckle 1 of this embodiment, the user may pull the operating cord 30 or push the operating parts of the legs 121A and 121B when releasing the buckle 1. The engagement operation of the buckle 1 of this embodiment may be the same as that of a known buckle. (Effects of this embodiment) As described above, the buckle 1 of this embodiment includes a plug 10 and a socket 20 into which the plug 10 is inserted. The plug 10 includes: a base 11 on which a connected body can be mounted; legs 121A and 121B that protrude from the base 11 in the +X direction (insertion direction) of the plug 10 and are opposite to each other in the Y direction (width direction); an engaging portion 13A that is provided on the leg 121A so as to be engageable with the socket 20 and can be released from the socket 20 by elastic deformation of the leg 121A in the Y direction; and an engaging portion 13B that is provided on the leg 121A so as to be engageable with the socket 20. The leg 121B is provided in a locking manner, and can be released from the socket 20 by elastic deformation of the leg 121B in the Y direction; the rope parts 14A and 14B are arranged between the leg 121A and the leg 121B, and the operating rope 30 is hung on the rope parts 14A and 14B respectively; the connecting part 15 connects the leg 121A and the rope part 14A; and the connecting part 15B connects the leg 121B and the rope part 14B, and the rope part 14A and the rope part 14B are arranged at different positions in the Z direction (thickness direction). In such a structure, the plug 10 is coupled to the socket 20 by engaging the engaging portions 13A and 13B of the plug 10 with the socket 20. In order to release the plug 10 from the socket 20, the user pulls the operating cord 30 in the -X direction (unplugging direction). If the legs 121A and 121B that are subjected to the operating forces F1 and F2 of the operating cord 30 by the hanging cord portions 14A and 14B are elastically deformed in the Y direction, respectively, the engaging portions 13A and 13B are disengaged from the socket 20. At this time, the hanging cord portions 14A and 14B are displaced in a manner that they are close to each other in the Y direction, but are arranged at different positions in the Z direction, so that mutual interference can be prevented. That is, the hanging cord portions 14A and 14B are arranged in a manner that does not interfere with each other, so that although they are not elastically deformed respectively, they can be displaced in the Y direction. Therefore, a structure that improves the rigidity of each of the hanging cord portions 14A and 14B can be formed, which can improve the strength of the plug 10. In the present embodiment, the hook portion 14A protrudes from the connection portion 15A in the Y direction, and the hook portion 14B protrudes from the connection portion 15B in the Y direction. In such a structure, the rigidity of each of the hook portions 14A and 14B can be more appropriately improved. In the present embodiment, the hook parts 14A and 14B have through holes 16A and 16B that penetrate through the hook parts 14A and 14B in the Z direction, respectively, and are arranged to overlap each other at least partially in the Z direction. In such a structure, the cord hook portions 14A and 14B are formed in a loop shape surrounding the through holes 16A and 16B, respectively. Therefore, the operation cord 30 passing through the through holes 16A and 16B is unlikely to fall off from the cord hook portions 14A and 14B. In the present embodiment, the cord hooking parts 14A and 14B have cord contact edges 142A and 142B facing in the +X direction a region (hole main body region R1) where the through holes 16A and 16B overlap in the Z direction. According to such a configuration, the operation cord 30 can appropriately apply the operation forces F1 and F2 to the cord parts 14A and 14B, respectively. In the present embodiment, the through hole 16A of the hook portion 14A exposes the cord contact edge 142B of the hook portion 14B in the +Z direction, and the through hole 16B of the hook portion 14B exposes the cord contact edge 142A of the hook portion 14A in the -Z direction. In such a structure, the cord contact edges 142A and 142B are exposed on both sides of the Z direction, so they can properly contact the operation cord 30 that passes through the through holes 16A and 16B. In addition, the state in which the cord portions 32A and 32B contact the cord contact edges 142A and 142B can be properly maintained during the displacement of the cord hanging portions 14A and 14B. As a result, the operation forces F1 and F2 can be equally applied to the cord hanging portions 14A and 14B. In this embodiment, the rope abutment edge 142A is inclined relative to the Y direction in a manner that the farther away from the leg 121A in the Y direction, the closer it is to the -X direction, and the rope abutment edge 142B is inclined relative to the Y direction in a manner that the farther away from the leg 121B in the Y direction, the closer it is to the -X direction. In such a structure, the operation forces F1 and F2 applied to the cord contact edges 142A and 142B are likely to generate bending moments, thereby improving the operability of releasing the buckle 1. In this embodiment, the rope abutment edge 142A is configured so that the distance from the leg 121A in the Y direction is longer than the distance from the rope abutment edge 142B to the leg 121A, and the rope abutment edge 142B is configured so that the distance from the leg 121B in the Y direction is longer than the distance from the rope abutment edge 142A to the leg 121B. In such a structure, the operation forces F1 and F2 applied to the cord contact edges 142A and 142B are likely to generate bending moments, thereby improving the operability of releasing the buckle 1. The socket 20 of this embodiment includes a housing portion 22 for accommodating the plug 10 . The housing portion 22 has an opening AP for inserting the plug 10 and a slit SL extending from the opening AP in the +X direction and exposing the cord insertion hole 160 from the housing portion 22 in the Z direction. In such a structure, the operation cord 30 is attached to the plug 10 so as not to interfere with the socket 20. Furthermore, even when the directions of the operation forces F1 and F2 of the operation cord 30 are inclined relative to the X direction (including, for example, the Z direction component), interference between the operation cord 30 and the socket 20 can be suppressed. [First Modification] In the above embodiment, the engaging portions 13A and 13B of the plug 10 are provided at the distal end portions 123 of the leg portions 121A and 121B, but the present invention is not limited thereto. For example, Fig.11 As shown, the plug 10A of the first modified example may also have engaging portions 13C and 13D provided in the middle portion 124 of the leg portions 121A and 121B instead of the engaging portions 13A and 13B of the above embodiment. The engaging portions 13C and 13D protrude outward from the leg portions 121A and 121B in the Y direction. In addition, the engaging portions 13C and 13D have abutting surfaces 133 facing the -X direction similarly to the engaging portions 13A and 13B of the above embodiment. The engaging portions 13C and 13D are arranged in the holes TH of the side wall portions 223A and 223B of the housing portion 22, and can engage with the side wall portions 223A and 223B in the X direction. In the first modification, the hook parts 14A and 14B are supported by the distal ends 123 of the legs 121A and 121B. That is, the connection part 15A connects the distal end 123 of the leg 121A and the hook part 14A, and the connection part 15B connects the distal end 123 of the leg 121B and the hook part 14B. In this first modification as well, the same effects as those of the above-described embodiment can be achieved. [Second Modification] In the above embodiment, the housing portion 22 of the socket 20 has the hole TH for exposing the leg portions 121A and 121B to the outside from the housing portion 22 , but the present invention is not limited thereto. For example, Fig.12 As shown, the housing portion 22 of the socket 20A of the second modification may not have the hole TH. In other words, the housing portion 22 may be formed so as to cover the outer sides of the leg portions 121A and 121B in the Y direction. In the second modification, the same effects as those of the above-described embodiment can be achieved, and the strength of the buckle 1 against external impact can be increased. In the second modification, the buckle 1 can be released by operation using the operating cord 30 . [Other Modifications] In the above-described embodiment, the shapes and arrangements of the hanging strap portions 14A and 14B are not limited to those described above, and may be modified as appropriate. For example, the rope hanging parts 14A and 14B are not limited to being ring-shaped surrounding the through holes 16A and 16B, but may have a notch communicating with the through holes 16A and 16B. The rope hanging parts 14A and 14B may be shaped to hang the operation rope 30, and may be other than a plate shape, such as a rod shape. In addition, the hanging rope parts 14A and 14B may be in contact with each other in the Z direction so as to be slidable in the Y direction, instead of being arranged to face each other with a gap therebetween in the Z direction. In the above-described embodiment, the shape and arrangement of the through holes 16A and 16B are not limited to the above-described ones, and can be changed as appropriate. In addition, the shape and arrangement of the through holes 16A and 16B may allow the balance of the operating forces F1 and F2 applied to the cord hanging parts 14A and 14B to deviate as long as it is within a range that does not hinder the release operation of the buckle 1. For example, in the above embodiment, all of the through holes 16A and 16B may overlap each other. Alternatively, in the above embodiment, any of the through holes 16A and 16B may expose the cord contact edge 142A (or 142B) in the Z direction. In the above embodiment, the hanging rope portion 14A may protrude from the connecting portion 15A in the insertion direction (+X direction) of the plug 10. Similarly, the hanging rope portion 14B may protrude from the connecting portion 15B in the insertion direction (+X direction) of the plug 10. In this case, the through holes 16A and 16B may not overlap in the Z direction. In addition, the operating rope 30 may also pass through the through holes 16A and 16B, respectively. In the above-described embodiment, the connection parts 15A and 15B only need to connect the leg parts 121A and 121B and the hanging rope parts 14A and 14B, and the shape thereof is not particularly limited. In the above embodiment, the housing portion 22 of the socket 20 may not have the slit SL. In this case, the operation cord 30 may be pulled out from the plug 10 to the outside of the housing portion 22 through the opening AP of the housing portion 22 . In the above embodiment, the rope portions 32A and 32B of the operation rope 30 respectively apply the operation forces F1 and F2 to the rope hanging portions 14A and 14B of the plug 10, but the present invention is not limited thereto. For example, a single operation rope having a certain width may be passed through the rope through hole 160 of the plug 10, and the operation rope may apply the operation force to the rope hanging portions 14A and 14B.

Claims

1. A buckle comprising a plug (10) and a socket (20) into which the plug (10) is inserted, The plug (10) comprises: A base (11) capable of mounting a connected object; a first leg (121A) and a second leg (121B) which protrude from the base (11) in the insertion direction of the plug (10) and are opposed to each other in a width direction orthogonal to the insertion direction; a first engaging portion (13A, 13C) which is arranged on the first leg portion (121A) in a manner capable of engaging with the socket (20) and can be released from the socket (20) by elastic deformation of the first leg portion (121A) in the width direction; a second engaging portion (13B, 13D) which is arranged on the second leg portion (121B) in a manner capable of engaging with the socket (20) and can be released from the socket (20) by elastic deformation of the second leg portion (121B) in the width direction; A first hanging rope portion (14A) and a second hanging rope portion (14B), which are arranged between the first leg portion (121A) and the second leg portion (121B), and the operating rope (30) is hung on the first hanging rope portion (14A) and the second hanging rope portion (14B) respectively; a first connecting portion (15A) for connecting the first leg portion (121A) and the first hanging rope portion (14A); and a second connecting portion (15B) for connecting the second leg portion (121B) and the second hanging rope portion (14B); The first hanging rope portion (14A) and the second hanging rope portion (14B) are arranged at different positions in a thickness direction that is orthogonal to the insertion direction and the width direction, respectively.

2. The buckle according to claim 1, wherein: The first hanging rope portion (14A) protrudes from the first connecting portion (15A) in the width direction or the insertion direction. The second hanging rope portion (14B) protrudes from the second connecting portion (15B) in the width direction or the insertion direction.

3. The buckle according to claim 1, wherein: The first hanging rope portion (14A) and the second hanging rope portion (14B) have through holes (16A, 16B), and the through holes (16A, 16B) respectively penetrate the first hanging rope portion (14A) and the second hanging rope portion (14B) in the thickness direction, and are arranged in a manner of at least partially overlapping each other in the thickness direction.

4. The buckle according to claim 3, wherein: The first rope hanging part (14A) and the second rope hanging part (14B) have rope abutment edges (142A, 142B), and the rope abutment edges (142A, 142B) face the through holes (16A, 16B) in the insertion direction and overlap with each other in the thickness direction.

5. The buckle according to claim 4, wherein: The through hole (16A, 16B) of at least one of the first rope hanging part (14A) and the second rope hanging part (14B) exposes the rope abutment edge (142A, 142B) of the other of the first rope hanging part (14A) and the second rope hanging part (14B) in the thickness direction.

6. The buckle according to claim 4, wherein: The rope contact edge (142A) of the first rope hanging part (14A) is inclined relative to the width direction in such a manner that the farther away from the first leg part (121A) in the width direction, the more toward the removal direction which is the opposite direction to the insertion direction. The cord contact edge (142B) of the second cord hook portion (14B) is inclined relative to the width direction so as to be farther away from the second leg portion (121B) in the width direction and toward the pulling direction.

7. The buckle according to claim 4, wherein: The rope contact edge (142A) of the first rope hanging portion (14A) is arranged so that the distance from the first leg portion (121A) in the width direction is longer than the distance from the rope contact edge (142B) of the second rope hanging portion (14B) to the first leg portion (121A). The rope contact edge (142B) of the second rope hanging portion (14B) is arranged in a manner such that the distance from the second leg portion (121B) in the width direction is farther than the distance from the rope contact edge (142A) of the first rope hanging portion (14A) to the second leg portion (121B).

8. The buckle according to claim 4, wherein: The socket (20) includes a housing portion (22) for accommodating the plug (10). The housing portion (22) has: an opening (AP) for inserting the plug (10); and One or more slits (SL) extend from the opening (AP) in the insertion direction and expose the through holes (16A, 16B) from the casing (22) in the thickness direction.

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