WO2020213160A1

WO2020213160A1 - Buckle

Info

Publication number: WO2020213160A1
Application number: PCT/JP2019/016853
Authority: WO
Inventors: 直幸伊藤
Original assignee: Ykk株式会社
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2020-10-22
Also published as: CN113660881B; CN113660881A; TW202038793A; TWI726392B

Abstract

A plug 12, 76 and a socket 14, 78 are provided such that portions of each can be connected to and released from each other. The plug 12, 76 comprises a pair of elastically deformable projecting pieces 32, 80. The socket 14, 78 comprises a projecting bar 66, 82 that press-contacts the pair of projecting pieces 32, 80. The pair of projecting pieces 32, 80 are aligned in a left-right direction intersecting the insertion direction of the plug 12, 76. In the projecting bar 66, 82, base parts 66b, 82b on the opposite side from an insertion opening 40a in the socket 14, 78 overhang in the left-right direction farther than tip end parts 66c, 82c close to the insertion opening 40a. When the plug 12, 76 and the socket 14, 78 are engaged, the projecting pieces 32, 80 contact the base parts 66b, 82b of the projecting bar 66, 82 and elastically deform, and suppress play in the engagement between the plug 12, 76 and the socket 14, 78.

Description

buckle

The present invention relates to a buckle that allows belts, tapes and other separate parts to be connected and disconnected from each other.

Conventionally, as a buckle that detachably connects two objects to be connected, for example, there is a buckle disclosed in Patent Document 1. This buckle is composed of a buckle body and a plug, and the buckle body has a storage space for inserting and engaging the plug. The accommodation space is provided with a ridge portion that protrudes toward the insertion opening into which the buckle body is inserted. The insertion body is provided with a pair of operating rods that are inserted into and engaged with the accommodating space of the buckle body, and a pair of protrusions that sandwich the protrusion portion are provided between the pair of operating rods. According to this buckle, when the insertion body is inserted into the buckle body, the protrusions follow both sides of the ridge, so that the guideability in the insertion operation is good, the rattling at the time of insertion is eliminated, and the engagement It is stable even in a state.

The buckle disclosed in Patent Document 2 is composed of a plug and a socket, and the socket is provided with a triangular pushing member protruding toward the insertion port in a storage space where the plug is inserted and engaged, and is pushed. The member is attached via a coil spring that expands and contracts toward the insertion slot. The plug is provided with a pair of legs that are inserted into and engaged with the accommodation space of the socket, and a pair of projecting pieces are provided between the pair of legs. The tips of the pair of projecting pieces are shaped to gradually open outward from each other, and when the plug and socket are engaged, the tips of the push members of the socket are urged between the pair of projecting pieces and are elastically sandwiched. And abut. According to this buckle, when the plug and the socket are engaged, the pushing member that elastically contacts the buckle makes it stable without rattling.

JP 2000-125910 U.S. Pat. No. 5,845,376

In any of the above background technologies, the buckle is integrally molded with resin, and the resin shrinks slightly after molding. This shrinkage is slightly different due to the material change due to the change of the resin color of the buckle, and especially in the case of the buckle socket, it shrinks as a whole and the thick part shrinks more and shrinks. It is difficult to accurately predict the degree of deformation due to the above at the design stage. Furthermore, since the dimensional error between the plug and the socket greatly affects rattling and operability during engagement, it is necessary to minimize the dimensional error due to this shrinkage, and for sockets that anticipate this shrinkage. The production of molding dies was difficult to complete in a single design.

In the buckle of Patent Document 1, in order to eliminate rattling when the plug and the socket are engaged, a part of the leg portion of the plug is elastically brought into contact with the side wall of the socket, and the ridge portion in the socket is formed. It is sandwiched by a pair of projecting pieces of the plug to eliminate rattling. However, as described above, it is difficult to predict how the shrinkage amount will change when the molding material or conditions are changed, and it is necessary to make many prototypes each time the molding material or conditions are changed. Therefore, a lot of man-hours were required to design and manufacture the mold and mass-produce the product. In addition, it was necessary to process the buckle after molding in order to keep it within the dimensional tolerance.

The buckle of Patent Document 2 is stable without rattling even if the amount of contraction changes because the pushing member is urged by the coil spring. However, coil springs and pushing members are required, the number of parts is large, the structure is complicated, the assembly process is large, and the cost is high.

The present invention has been made in view of the above-mentioned problems of the background art, and provides a buckle that is easy to design and manufacture, suppresses rattling when engaging a plug and a socket, and stably engages. The purpose is to do.

The present invention is a buckle composed of a plug and a socket that allow separate parts to be connected and disconnected from each other, and the plug is formed with a pair of elastically deformable protrusions protruding toward the socket. The socket is formed with ridges that are in pressure contact with the pair of protrusions so as to project toward the plug. The pair of projecting pieces are provided side by side in the left-right direction intersecting the insertion direction of the plug. The ridge is formed so that the base portion of the socket opposite to the insertion port protrudes in the left-right direction from the tip portion close to the insertion port. In a state where the plug and the socket are engaged, the projecting piece abuts on the base portion of the projecting rod and elastically deforms, resulting in an engaged state in which rattling is suppressed in the left-right direction. As for the pair of protrusions and the protrusions, the protrusions may be formed on the plug and the pair of protrusions may be formed on the socket.

The ridges are inserted between the pair of ridges, and the left and right outer surfaces of the ridges are thicker with the base projecting in the left-right direction, and are thicker than the inner spacing of the pair of ridges. , The pair of projecting pieces abut on the base portion, elastically deform and press contact.

The ridges are provided with a pair attached along the outer side of the pair of ridges in the left-right direction, and the base of the pair of inner surfaces of the ridges is projected in the left-right direction. Narrower than the width between the outer surfaces in the left-right direction of the above, the pair of protrusions abut on the base portion, elastically deform and press contact.

The distance between the pair of projecting pieces is wider as it approaches the tip of the projecting pieces. Therefore, in the engaged state, the plug receives a force toward the direction away from the socket, but since the plug is engaged with the socket, the plug does not separate, and the plug is engaged while suppressing the movement in the front-rear direction.

The socket is provided so that the upper surface portion and the lower surface portion face each other with a predetermined interval, form a fitting portion into which the plug is inserted, and communicate with the insertion port into which the plug is inserted. A linear guide groove along the insertion direction is provided at a constant depth. When the plug is inserted into the socket, the projecting piece is partially fitted into the guide groove on the upper surface portion and the guide groove on the lower surface portion, and is surely guided and entered in the insertion direction. The guide groove on the lower surface portion is provided with the ridge, and the ridge may be connected to the upper surface portion, but a shape that does not abut on the upper surface portion is preferable.

The ridge is provided with a step portion in which the thickness of the ridge changes between the ridge and a tip portion thinner than the base portion, and the step portion is formed between the tip portion and the tip portion. It is formed by a tapered surface continuous with the base.

The buckle of the present invention can be efficiently designed and manufactured, and when engaged, it can suppress rattling between the plug and the socket and can be stably engaged. Further, when engaging, the protrusion of the plug and the protrusion of the socket ensure that the plug is guided in the insertion direction into the socket, and the plug can be smoothly engaged.

It is a vertical sectional view which shows the unengaged state of the buckle of 1st Embodiment of this invention. It is a vertical cross-sectional view which shows the engaging state of the buckle of 1st Embodiment of this invention. It is a front view (a), a right side view (b), and a rear view (c) which show the engagement state of the buckle of the 1st Embodiment of this invention. It is a top view (a), a front view (b), a right side view (c), and a rear view (d) of the buckle socket of the first embodiment of the present invention. It is a perspective view of the plug of the buckle of 1st Embodiment of this invention. It is a vertical sectional view which shows the unengaged state of the buckle of the 2nd Embodiment of this invention. It is a vertical sectional view which shows the engaging state of the buckle of the 2nd Embodiment of this invention. It is a top view (a), a front view (b), a right side view (c), and a rear view (d) of the buckle socket of the second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show a first embodiment of the present invention, in which the buckle 10 of this embodiment comprises a plug 12 and a socket 14 to which the plug 12 is fitted and engaged with each other. It is attached to each member such as a belt or tape that is arbitrarily connected and disconnected. In the following description, the extending direction of the pair of leg portions 20 described later of the plug 12 is the front-rear direction, the direction orthogonal to the front-rear direction and the direction in which the pair of leg portions 20 face each other is the left-right direction, and the left-right direction. The direction orthogonal to the front-back direction is called the front-back direction or the thickness direction.

The plug 12 is integrally molded with a synthetic resin such as acetal, polyamide, or polypropylene. As shown in FIG. 5, the plug 12 includes a tape threading portion 24 which is a base for attaching a member such as a belt or a tape, a pair of leg portions 20 extending away from the tape threading portion 24, and a leg portion 20. It is provided with an engaging protrusion 22 integrally provided at a position closer to the tip portion 20a of the above.

The pair of leg portions 20 have the same length as each other, with the extending directions from the base end portion 20b continuous with the tape threading portion 24 toward the tip end portion 20a parallel to each other. In each leg portion 20, the intermediate portion 20c, which is substantially intermediate between the tip end portion 20a and the base end portion 20b, is curved and bulges outward in the left-right direction so as to be separated from each other. The outer surfaces of the pair of legs 20 that do not face each other form an operating portion 19 that bulges outward. The inner surfaces of the pair of legs 20 facing each other are also separated from each other by curving outward in the vicinity of the intermediate portion 20c. A slit 21 penetrating in the front and back directions is provided at the center of each leg 20. The slit 21 passes through the center of the leg portion 20 and is formed in a thin curved shape along the extending direction of the leg portion 20 to facilitate elastic deformation of the leg portion 20.

The engaging protrusions 22 are provided so as to project in both the front and back directions at positions closer to the tip portion 20a of the leg portion 20, and the engaging protrusions 22 are engaged with the locked portion 50 or the accommodating recess 62 of the socket 14 described later. It is formed to be possible.

The base end portion 20b of the pair of leg portions 20 is integrally provided with one straight rod-shaped bridge 30, and connects the pair of leg portions 20. The bridge 30 is formed long in the left-right direction, and a pair of projecting pieces 32 projecting in parallel with the projecting direction of the leg portions 20 are provided on the inner side surface 30a where the pair of leg portions 20 are continuous. The projecting piece 32 has a straight rod shape protruding along the leg portion 20, and the cross-sectional shape intersecting the protruding direction is a rectangle long in the front and back directions. Of the left-right side surfaces of the pair of projecting pieces 32, the side surfaces facing each other are slightly inclined so as to be separated from each other as they approach the tip of the projecting pieces 32. Tapered surfaces 32a are formed on the tip portions of the side surfaces of the projecting pieces 32 facing each other so as to be separated from each other as they approach the tip. The pair of projecting pieces 32 preferably have the same shape that is line-symmetrical to each other, but they do not necessarily have to be line-symmetrical and may have an asymmetrical shape.

The tape threading portion 24 is parallel to the bridge 30 and is located on the opposite side of the first bar 34 formed long in the left-right direction and the leg portion 20 of the first bar 34, and the first bar 34 A second bar 36 parallel to the above is provided. Both ends of the first bar 34 and the second bar 36 are connected to each other by side surface portions 38, respectively. A tape insertion hole 24a is formed between the first bar 34 and the second bar 36. A space is also provided in a portion surrounded by the first bar 34 and the bridge 30, and a tape insertion hole 24b is formed.

Next, the thickness of each part of the plug 12 in the front and back directions will be described. The leg portion 20 is formed to be thinner in the front-back direction than the side surface portion 38 of the tape threading portion 24, and the bridge 30 is formed to have substantially the same thickness in the front-back direction as the leg portion 20. The portion of the tip portion 20a of the leg portion 20 slightly separated from the engaging protrusion 22 is thinner than the peripheral portion thereof. The protruding surface of the engaging protrusion 22 is flat and has the same thickness as the other parts of the leg 20. The projecting piece 32 is formed thicker than the leg portion 20, and projects from the leg portion 20 in the front-back direction when viewed from the left-right direction.

Next, the socket 14 will be described. The socket 14 is also integrally molded with a synthetic resin such as polyacetal, polyamide, or polypropylene. The socket 14 includes a fitting portion 40 into which the leg portion 20 of the plug 12 is inserted, and a tape threading portion 42 for attaching a member such as a belt or tape. The tape threading portion 42 is provided with a tape insertion hole 42a for inserting a tape member or the like and a connecting bar 44 for connecting the tape member or the like, and both ends of the connecting bar 44 are formed on a pair of side surface portions 45 long in the front-rear direction. It is connected.

On the side surface of the side surface portion 45 opposite to the connecting bar 44, an upper surface portion 46 and a lower surface portion 48 are provided facing each other in the front-back direction at a predetermined interval, and a fitting portion 40 into which the plug 12 is inserted is provided. Is forming. The upper surface portion 46 becomes slightly thinner as it is separated from the side surface portion 45 in the front-rear direction, and gradually becomes wider as it approaches the end portion on the opposite side of the tape threading portion 42, which is the same as the width between the pair of side surface portions 45. It is a plate in the shape of a drum. The lower surface portion 48 is a plate body having substantially the same shape as the upper surface portion 46, and the corner portion of the peripheral edge portion of the tape insertion hole 42a is cut out in a rectangular shape to provide the locked portion 50.

The upper surface portion 46 and the lower surface portion 48 face each other at a predetermined interval, and a side surface portion 52 for connecting the upper surface portion 46 and the lower surface portion 48 is provided at an end portion on the side opposite to the tape threading portion 42. A pair of side surface portions 52 are provided on the left and right sides and have a predetermined length in the front-rear direction. The fitting portion 40 has a tubular shape, and a storage space 40b into which a plug 12 is inserted is inserted between the upper surface portion 46 and the lower surface portion 48. Is formed. The side of the accommodation space 40b opposite to the tape threading portion 42 is surrounded by a pair of side surface portions 52, an upper surface portion 46, and a lower surface portion 48, and serves as an insertion port 40a into which the plug 12 is inserted. The side surface portion 52 reaches a predetermined length from the insertion port 40a, and a slit 56 is formed between the side surface portion 52 and the side surface portion 45 and is open.

The outer surfaces of the upper surface portion 46 and the lower surface portion 48 are formed flat. As shown in FIG. 4B, linear guide grooves 58 that vertically traverse the front-rear direction are provided at a constant depth on the inner surfaces of the upper surface portions 46 that face each other. The guide groove 58 is formed by passing through the center of the upper surface portion 46 in the left-right direction, one end reaching the insertion port 40a, and the other end slightly more than the center in the front-rear direction of the upper surface portion 46. It has reached a position close to the tape threading portion 42. When the plug 12 and the socket 14 are engaged with each other, the guide groove 58 is inserted into the front and back ends of the projecting piece 32 of the plug 12, and guides the plug 12 in the front-rear direction, which is the insertion direction.

A pair of guide protrusions 60 are provided on the left and right sides of the slit 56 on the side edge portion close to the tape passing portion 42. As shown in FIG. 4B, the guide protrusion 60 has an elongated shape along the side edge portion of the slit 56, and the end portion close to the insertion port 40a is taped from the insertion port 40a. A guide surface 60a toward the center of the upper surface portion 46 toward the through portion 42 and an inner wall surface 60b facing the tape through portion 42 and located in the left-right direction are formed to form a triangular shape. The space of the inner wall surface 60b on the side of the tape passing portion 42 becomes a housing recess 62 in which the engaging protrusion 22 of the leg portion 20 is housed. When the plug 12 and the socket 14 are engaged with each other, the accommodating recess 62 accommodates the engaging projection 22 of the plug 12, and a part of the engaging projection 22 faces the inner wall surface 60b and cannot be pulled out. The guide surfaces 60a of the pair of guide protrusions 60 facing each other elastically deform the leg portion 20, and the pair of leg portions 20 inserted into the insertion port 40a follow the guide protrusion 60 as the insertion amount increases. Elastically deforms so that they approach each other. Then, the elastic deformation is restored in the accommodating recess 62, and the engaging projection 22 is inserted into the accommodating recess 62 so that it cannot be pulled out. The accommodating recess 62 is located at a position facing the locked portion 50 of the lower surface portion 48, and has substantially the same shape as the locked portion 50. A notch 63 in which a thick portion near the lower end of the operation portion 19 of the leg portion 20 is fitted is formed in a part of the guide protrusion 60 continuous with the side edge portion of the slit 56.

A guide groove 64 is provided at a constant depth on the inner surface of the lower surface portion 48, similarly to the guide groove 58 of the upper surface portion 46. The guide groove 64 is formed by passing through the center of the lower surface portion 48 in the left-right direction, and one end portion reaches the insertion port 40a and the other end portion reaches the vicinity of the locked portion 50. When the plug 12 and the socket 14 are engaged with each other, the guide groove 64 is inserted into the front and back ends of the projecting piece 32 of the plug 12, and guides the plug 12 in the insertion direction, that is, in the front-rear direction.

A ridge 66 is formed in the center of the guide groove 64. The ridge 66 has a plate shape that is long in the front-rear direction and thin in the left-right direction, and one end in the front-rear direction reaches the locked portion 50 and the other end reaches the vicinity of the insertion port 40a. There is. In the front-back direction, it projects from the bottom of the guide groove 64 toward the upper surface portion 46 and is close to the upper surface portion 46 with a gap. The width of the ridge 66 in the left-right direction gradually narrows as it approaches the insertion opening 40a. On the left and right pair of outer surfaces of the ridges 66, stepped portions 66a having a wider width are provided in the left-right direction at positions slightly closer to the locked portion 50 than the center in the front-rear direction. The portion closer to the locked portion 50 than the step portion 66a is the base portion 66b, the portion closer to the insertion port 40a than the step portion 66a is the tip portion 66c, and the tip portion 66c is thinner than the base portion 66b. The step portion 66a is formed by a tapered surface continuous from the wide base portion 66b to the narrow base portion 66c, and the base portion 66b and the tip portion 66c are slightly narrowed in the left-right direction as they approach the insertion opening 40a, respectively. The ridge 66 is inserted between the pair of ridges 32 of the plug 12, the tip 66c is formed to be thinner than the distance between the pair of ridges 32, and the base 66b is formed from the distance between the pair of ridges 32. Is also formed a little thicker. It is preferable that the tip portion 66c narrows in the left-right direction as it approaches the insertion slot, but the same thickness may be used as long as the shape is narrower than the width between the pair of projecting pieces 32.

A pair of guide protrusions 68 are provided on the left and right sides of the slit 56 of the lower surface portion 48 near the tape passing portion 42. As shown in FIG. 4C, the guide protrusion 68 has the same shape as the guide protrusion 60 of the upper surface portion 46 when viewed from the front and back directions, and is formed elongated along the side edge portion of the slit 56 and inserted. At the end near the mouth 40a, a guide surface 68a toward the center of the lower surface 48 from the insertion port 40a toward the tape threading portion 42 and an inner wall surface 68b facing the tape threading portion 42 and located in the left-right direction are formed. It is formed in a triangular shape. The inner wall surface 68b coincides with the edge portion of the locked portion 50, and is engaged when the engaging projection 22 of the leg portion 20 is accommodated in the locked portion 50 when the plug 12 and the socket 14 are engaged. Facing the joint protrusion 22. The guide surfaces 68a of the pair of guide protrusions 68 facing each other elastically deform the leg portion 20 in the same manner as the guide surfaces 60a of the guide protrusions 60. Then, the elastic deformation is restored at the locked portion 50, and the engaging projection 22 is inserted into the locked portion 50 so that it cannot be pulled out. A notch 63 in which a thick portion near the lower end of the operation portion 19 of the leg portion 20 is fitted is formed in a part of the guide protrusion 68 continuous with the side edge portion of the slit 56.

Next, the engaging operation and usage of the buckle 10 of this embodiment will be described below. First, the method of attaching the

tape members

70 and 72 to the plug 12 of the buckle 10 will be briefly described. A first bar 34 and a second bar 36 are provided in the tape threading portion 24 of the plug 12, and the tape member 70 for connection is inserted into the tape insertion hole 24b from the back surface side of the plug 12, and the first bar is inserted. It is inserted from the front surface side to the back surface side of the tape insertion hole 24a through the outer circumference of the bar 34, overlapped with its own tape member, and pulled out with adjustable length. On the other hand, the tape member 72 attached to the socket 14 is non-adjustably connected to one connecting bar 44.

The engagement operation between the plug 12 and the socket 14 is such that the leg 20 of the plug 12 faces the insertion port 40a of the socket 14 and the plug 12 is pushed into the socket 14. When the leg portion 20 is inserted into the accommodation space 40b, the leg portions 20 are surrounded by the

guide protrusions

60 and 68 on the upper, lower, left and right sides, and the distance between the left and right guide surfaces 60a and 68a becomes narrower as the plug 12 is inserted, so that the leg portions 20 approach each other. Elastically deforms like this. Then, when the engaging protrusion 22 of the leg portion 20 reaches the accommodating recess 62 of the upper surface portion 46 or the locked portion 50 of the lower surface portion 48, the elastic deformation is restored and fits into the accommodating recess 62 or the locked portion 50. Will be done. The engaging protrusion 22 abuts on the inner wall surface 60b and the inner wall surface 68b of the

guide protrusions

60 and 68 and engages with each other so that they cannot be pulled out. The plug 12 and the socket 14 are securely connected, and the engagement shown in FIGS. It becomes a state.

At this time, the pair of protrusions 32 of the plug 12 are inserted along the pair of left and right outer surfaces of the protrusions 66 of the socket 14 between the pair of protrusions 32, and when the plug 12 is inserted. Guided in the insertion direction. Since the tapered surface 32a of the protrusion 32 is formed so as to open toward the insertion port 40a, the protrusion 66 is surely inserted inward. A part of the projecting piece 32 is fitted into the guide groove 58 of the upper surface portion 46 and the guide groove 64 of the lower surface portion 48, and the projecting piece 32 surely enters in the insertion direction. Since the tip 66c of the ridge 66 is formed thinner than the distance between the pair of ridges 32, the ridge 32 enters without elastic deformation, and the base 66b is formed thicker than the distance between the pair of ridges 32. Therefore, when the tip of the projecting piece 32 reaches the step portion 66a of the ridge 66, the projecting piece 32 is pushed by the step portion 66a, elastically deforms and spreads, and enters while pressing against the base portion 66b. In the engaged state, the projecting piece 32 presses against the base 66b and engages in the left-right direction without rattling. Since the facing sides of the pair of projecting pieces 32 are slightly inclined so as to separate from each other as they approach the tip of the projecting pieces 32, the plug 12 is slightly separated from the socket 14 in the engaged state. Although it receives a force, the engaging protrusion 22 of the plug 12 is engaged with the locked portion 50 of the socket 14 and the accommodating recess 62, so that the plug 12 does not separate from each other and engages with the movement in the front-rear direction suppressed. The operation portion 19 of the plug 12 projects outward from the slit 56 of the socket 14, and a part of the operation portion 19 is housed in the notch 63 of the

guide protrusions

60 and 68.

To release the connection between the plug 12 and the socket 14, the pair of operating portions 19 are pushed in from the outside, and the leg portion 20 of the plug 12 is inserted, and the engaging projection 22 is the inner wall surface 60b of the

guide projections

60 and 68 of the socket 14. , 68b is elastically deformed to a position that does not face it. In this state, if the plug 12 and the socket 14 are slightly relatively moved in the direction away from each other, the engagement is easily released.

According to the buckle 10 of this embodiment, when the plug 12 and the socket 14 are engaged, the leg portion 20 of the plug 12 is guided in the insertion direction and reliably enters, so that the plug 12 can be smoothly engaged. At the time of engagement, the protrusion 32 of the plug 12 presses against the base 66b of the protrusion 66 of the socket 14, so that there is no rattling and the engagement is stable. The plug 12 and the socket 14 are integrally molded with resin, and even if the resin shrinks after molding, the base 66b of the ridge 66 can be easily set to a size that allows for shrinkage error, and the ridge 32 Is elastically deformed and press-contacts with the base 66b of the ridge 66, so that rattling does not occur. Therefore, it is possible to set a relatively large dimensional tolerance between the shapes of the plug 12 and the socket 14, and it is necessary to perform many tests to see how the shrinkage amount changes when the molding material or conditions are changed. It does not require man-hours for designing, trial production, and processing, and is efficient. Since rattling can be suppressed by the elastic deformation of the projecting piece 32, the dimensional tolerance on the socket 14 side can be relatively large, and design and manufacture are easy. Moreover, the structure is simple and there is no need to increase the number of parts such as springs. When engaging, the projecting piece 32 of the plug 12 is partially fitted into the guide groove 58 of the upper surface portion 46 and the guide groove 64 of the lower surface portion 48 of the socket 14, and smoothly enters in the insertion direction. Can reach the engagement position. The overall structure is simple, compact and easy to use. Since the ridge 66 of the socket 14 of this embodiment does not reach the upper surface portion 46, even if the resin of the molding material shrinks, there is no sink mark on the upper surface portion 46, and the surface can be finished more smoothly. .. It is preferable that the ridges 66 do not reach the upper surface portion 46, but the ridges 66 may reach the upper surface portion 46 and are connected to each other.

Next, the second embodiment of the present invention will be described with reference to FIGS. 6 to 8. Here, the same members as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. The buckle 74 of this embodiment comprises a plug 76 and a socket 78.

Similar to the above embodiment, the pair of legs 20 of the plug 76 are integrally provided on one straight rod-shaped bridge 30, and the inner side surfaces 30a of the bridge 30 intersecting the protruding directions of the pair of legs 20. Is provided with a pair of projecting pieces 80 projecting in the projecting direction of the leg portion 20. The projecting piece 80 has a straight rod shape that projects along the extending direction of the leg portion 20, and the cross-sectional shape that intersects the projecting direction is a rectangular shape that is long in the front and back directions. The width in the left-right direction is narrow. The facing sides of the pair of projecting pieces 80 are slightly inclined so as to be separated from each other as they approach the tip of the projecting piece 80, and the pair of projecting pieces 82 are larger than the distance between the projecting pieces 32 of the buckle 10 of the above embodiment. The interval is narrow. The pair of projecting pieces 80 have the same shape that is line-symmetrical to each other, but they do not necessarily have to be line-symmetrical and may have an asymmetrical shape. The projecting piece 80 is formed thicker in the front-back direction than the leg portion 20, and projects from the leg portion 20 in the front-back direction when viewed from the left-right direction.

A guide groove 58 is provided at a constant depth on the inner surface of the upper surface portion 46 of the socket 78. A pair of guide protrusions 60 are provided on the left and right sides of the slit 56 at the side edge portion close to the tape passing portion 42. A guide groove 64 is provided on the inner surface of the lower surface portion 48 at a constant depth, similarly to the guide groove 58 of the upper surface portion 46.

The ridges 82 are formed at positions adjacent to the left and right of the guide groove 64, respectively. The ridge 82 has a plate shape that is long in the front-rear direction and thin in the left-right direction, is formed along the side edge portion of the guide groove 64, and one end portion in the front-rear direction reaches the locked portion 50. The other end reaches the vicinity of the insertion slot 40a. Preferably, in the front-back direction, the inner surface of the lower surface portion 48 and the inner surface of the upper surface portion 46 are continuous, and the inner space of the upper surface portion 46 and the lower surface portion 48 is separated. The width of the ridges 82 in the left-right direction gradually narrows as they approach the insertion port 40a, the distance between the ridges 82 gradually increases as they approach the insertion port 40a, and the guide groove 64 near the insertion port 40a. Away from.

On the surfaces of the pair of ridges 82 facing each other, step portions 82a whose width changes are provided so as to project in the left-right direction at a position slightly closer to the locked portion 50 than the center in the front-rear direction. The portion closer to the locked portion 50 than the step portion 82a is the base portion 82b, the portion closer to the insertion port 40a than the step portion 82a is the tip portion 82c, and the tip portion 82c is wider than the base portion 82b. The step portion 82a is formed by a tapered surface continuous from the tip portion 82c having a wide distance from each other to the base portion 82b having a narrow width. Preferably, the base portion 82b and the tip portion 82c are slightly inclined so as to be separated from each other as they approach the insertion opening 40a. The outer surfaces of the pair of ridges 82 that do not face each other are parallel to each other. The ridge 82 is attached along the outside of the pair of ridges 80 of the plug 76, and the distance between the tip portions 82c is formed wider than the distance between the outer surfaces of the pair of ridges 80. The distance between the bases 82b is formed to be slightly narrower than the distance between the outer surfaces of the pair of projecting pieces 80.

Next, the engaging operation of the plug 76 and the socket 78 of the buckle 74 of this embodiment will be described below. The leg portion 20 of the plug 76 is opposed to the insertion port 40a of the socket 78, and the plug 7612 is pushed into the socket 7814. When the leg portion 20 is inserted into the accommodation space 40b, the leg portion 20 is surrounded by the

guide protrusions

60 and 68 on the top, bottom, left and right, and the leg portion 20 is elastically deformed so as to approach each other. Then, when the engaging protrusion 22 of the leg portion 20 reaches the accommodating recess 62 of the upper surface portion 46 or the locked portion 50 of the lower surface portion 48, the elastic deformation is restored and fits into the accommodating recess 62 or the locked portion 50. Then, the engaged state shown in FIG. 7 is obtained.

At this time, the pair of protrusions 80 of the plug 76 are inserted between the pair of protrusions 82 of the socket 78, and are guided in the insertion direction when the plug 7612 is inserted. A part of the projecting piece 80 is fitted into the guide groove 58 of the upper surface portion 46 and the guide groove 64 of the lower surface portion 48, and the projecting piece 80 surely enters in the insertion direction. Since the distance between the tip portions 82c of the ridges 82 is wider than that of the pair of ridges 80, the ridges 80 enter without elastic deformation, and the base portion 82b is formed narrower than the pair of ridges 80. Therefore, when the tip of the projecting piece 80 reaches the step portion 82a of the ridge 82, the projecting piece 80 is pushed by the step portion 82a and elastically deformed to become thin, and enters while pressing against the base portion 82b. In the engaged state, the projecting piece 80 presses against the base 82b and engages in the left-right direction without rattling. Since the distance between the pair of ridges 82 becomes wider as it approaches the tip of the ridges 82, the plug 76 receives a force away from the socket 78 in the engaged state, but the engaging protrusion 22 of the plug 76 is the socket 78. Since it is engaged with the locked portion 50 and the accommodating recess 62, it does not separate from each other and engages with the movement in the front-rear direction suppressed.

According to the buckle 74 of this embodiment, it has the same effect as that of the above embodiment, and when engaging, the plug 76 and the socket 78 can be stably engaged by suppressing rattling. Further, when engaging, the plug 76 is guided in the insertion direction into the socket 78, and can be smoothly engaged.

Note that the buckle of the present invention is not limited to the above embodiment, and the shapes of the protrusions and the protrusions can be freely changed as long as they are securely pressed against each other. The shape of the leg of the plug may be any shape as long as it can be securely engaged with the socket and can be easily attached and detached. The item to which the buckle is attached may be a bag, clothing, warm clothing, or anything else.

10,74

Buckle

12,76

Plug

14,78 Socket 20 Leg 22

Engagement protrusion

24,42 Tape threading part 30

Bridge

32,80 Projection piece 34 First bar 36 Second bar 40 Fitting part 40a Insertion port 44 Connecting bar 46 Top surface 48

Bottom surface

58, 64

Guide grooves

66, 82

Protrusions

66a,

82a Steps

66b,

82b Base

66c, 82c Tip

Claims

A buckle (10,74) consisting of a plug (12,76) and a socket (14,78) that allows separate parts to be connected and disconnected from each other.
A pair of elastically deformable protrusions (32,80) are formed on one member of the plug (12,76) and the socket (14,78) so as to project toward the other member. A ridge (66, 82) that presses against the pair of protrusions (32, 80) is formed on the member so as to project toward the one member.
The pair of projecting pieces (32,80) are provided side by side in the left-right direction intersecting the insertion direction of the plug (12,76).
With the plug (12,76) and the socket (14,78) engaged, the protrusion (32,80) abuts on the base (66b, 82b) of the protrusion (66,82). A buckle characterized by elastic deformation and an engaged state that suppresses rattling.
The ridge (66) is inserted between the pair of ridges (32), and the left and right pair of outer surfaces of the ridge (66) are thickened with the base portion (66b) protruding in the left-right direction. The buckle according to claim 1, wherein the pair of protrusions (32) are thicker than the inner spacing of the pair of protrusions (32), and the pair of protrusions (32) are elastically deformed and pressure-welded in contact with the base portion (66b).
The ridges (82) are provided with a pair attached along the outer side of the pair of ridges (80) in the left-right direction, and the pair of left and right inner surfaces of the ridges (82) are the base portion (82b). ) Overhangs in the left-right direction, is narrower than the width between the outer surfaces of the pair of protrusions (80) in the left-right direction, and the pair of protrusions (80) abut on the base portion (82b) and elastically deform. The buckle according to claim 1, which is pressure-welded.
The buckle according to claim 1, wherein the distance between the pair of protrusions (32) is wider as the distance between the protrusions (32) is closer to the tip of the protrusions (32).
The socket (14) is provided with the upper surface portion (46) and the lower surface portion (48) facing each other at a predetermined distance from each other to form a fitting portion (40) into which the plug (12) is inserted. A linear guide groove (58, 64) is provided at a constant depth through the insertion port (40a) into which the plug (12) is inserted and along the insertion direction of the plug (12).
When the plug (12) is inserted into the socket (14), the projecting piece (32) is formed in the guide groove (58) of the upper surface portion (46) and the guide groove (48) of the lower surface portion (48). A part of 64) is fitted and securely guided in the insertion direction to enter.
The guide groove (64) of the lower surface portion (48) is provided with the ridge (66), and the ridge (66) has a shape that does not reach the upper surface portion (46). The buckle described.
The protrusion (66,82) has the protrusion between the front base portion (66b, 82b) and the narrow tip portion (66c, 82c) protruding from the front base portion (66b, 82b). Step portions (66a, 82a) in which the thickness of the strips (66, 82) are changed are provided, and the step portions (66a, 82a) are continuous with the tip portion (66c, 82c) and the base portion (66b, 82b). The buckle according to claim 1, which is formed of a tapered surface.