JP6761639B2 - buckle - Google Patents

Description

The present invention relates to a buckle that comprises a plug and socket that can be engaged and disengaged from each other and separates separate parts of a tape, belt, or other member from the connected state.

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 consists of a plug and a socket, and the plug extends parallel to each other from a tape threading portion, which is a mounting portion provided with a tape insertion hole through which a tape or the like is inserted and connected, and both ends in the width direction of the tape passing portion. It has a pair of legs. Each leg is elastically deformable, and a pair of engaging protrusions formed so as to project in the front-back direction is provided at the tip. The socket into which the plug is fitted is also provided with a tape threading portion provided with a tape insertion hole, and a hollow plug fitting portion is integrally provided from one end of the tape threading portion. The plug fitting portion is composed of an upper plate and a lower plate having an open tip portion, and operation openings are formed on both side edges of the upper plate and the lower plate in the width direction. On the base end side of the operation opening, an engaged portion that can be engaged with a pair of engaging protrusions of a pair of legs inserted into the plug fitting portion is formed. Then, at the end of the lower plate of the socket on the tape threading portion side, a hole extending parallel to the longitudinal direction of the tape threading portion is formed, and a protrusion is provided in the socket from the peripheral edge of the hole. Engagement protrusions on the plug are provided so that they can be engaged. Therefore, in the engaging body of the plug and the socket, the engaging projection of the plug is exposed from the hole.

Further, the buckle disclosed in Patent Document 2 also has the same basic configuration as in Patent Document 1, but an open opening is provided on the tape threading portion side of the socket, and this opening is provided. Therefore, the lower plate of the socket is continuously provided with an opening edge formed in a concave shape toward the insertion port side of the plug. As a result, the front end surface and the back surface of the engaging protrusion of the plug are exposed at this release port.

Japanese Unexamined Patent Publication No. 2004-160166 Japanese Unexamined Patent Publication No. 2011-254929

Since the buckle disclosed in Patent Document 1 is provided with a hole formed in the socket on a surface orthogonal to the insertion direction of the plug, if the socket is clogged with foreign matter such as dust or snow, In some cases, the foreign matter was not discharged from the hole and clogged in the socket, making it impossible to insert the socket or engage the engaging protrusion.

Further, in the case of the buckle disclosed in Patent Document 2, since the release port is formed on the tape through portion side of the socket, even if there is some foreign matter in the socket, the foreign matter is the tape of the socket when the plug is inserted. It is discharged from the release port on the through part side. However, there is a problem that the release port is large and foreign matter easily enters the socket. Furthermore, when foreign matter enters from the concave opening edge of the release port in the engaged state of the plug and the socket and is sandwiched between the pair of legs, the foreign matter cannot swing the engaging protrusions of the plug in the direction of approaching each other. , In some cases, it could not be released from the engaged state.

The present invention has been made in view of the above-mentioned problems of the background technology, and provides a buckle that can easily engage the plug even if there is a foreign substance in the socket and can surely disengage the plug. The purpose is to do.

The present invention comprises a plug and a socket that are connectable to each other and each have a mounting portion that is attached to a predetermined member, the plug having a pair of legs, each located closer to the tip of the pair of legs. An engaging portion is formed, and the socket has an insertion port into which the plug can be inserted at the ends of the upper surface portion and the lower surface portion while the upper surface portion and the lower surface portion face each other with a gap from each other. A fitting portion continuous from the insertion port is formed by the space between the upper surface portion and the lower surface portion, and the engaging portion is formed on at least one of the inner surface of the upper surface portion and the inner surface of the lower surface portion on which the fitting portion is formed. A pair of engaged portions are provided, and an opening is formed between the upper surface portion and the lower surface portion on the mounting portion side of the socket so as to communicate with the fitting portion and face the insertion port. A concave shape that communicates with the opening and penetrates in the front and back directions on the mounting portion side of at least one of the upper surface portion and the lower surface portion and in the central portion in the left-right direction, and does not open in the insertion port. A buckle in which an opening recess is formed, and the width of the opening recess in the left-right direction is narrower than the distance between the side surfaces of the pair of legs facing each other in the left-right direction.

The socket has a pair of through holes that are open in the front-back direction and continuous from the pair of engaged portions in at least one of the upper surface portion and the lower surface portion, and the opening recess is the upper surface portion and the lower surface portion. A side edge portion formed between at least one pair of the through holes of the portion and formed by a part of the upper surface portion or the lower surface portion is provided between the through hole and the opening recess. is there.

The opening recess is formed on one of the upper surface portion and the lower surface portion, and the opening recess is covered by the other end portion of the upper surface portion and the lower surface portion on the mounting portion side.

An end face wall portion is provided on the end face of the fitting portion on the mounting portion side, and the opening is formed in the end face wall portion. The width of the opening in the left-right direction is formed to be narrower than the distance between the side edges of the pair of through holes on the side of the opening recess. Alternatively, the opening may be formed so that the width in the left-right direction is wider than the distance between the side edges of the pair of through holes on the side of the opening recess.

The plug has a guide portion protruding in the front-rear direction between a pair of legs, and the tip of the guide portion is on the insertion port side of the opening recess in a state where the plug and the socket are engaged. It may be located at the edge.

The end face wall portion is formed by connecting the upper surface portion and the lower surface portion at the end edge of the side edge portion on the mounting portion side. Further, the opening is an opening over the entire width between the front and back surfaces of the fitting portion.

The buckle of the present invention can easily engage the plug even if there is a foreign substance in the socket, and can reliably disengage the plug. As a result, it is possible to provide a buckle with good operability, reliable engagement and disengagement, and high reliability and safety.

It is a perspective view which shows the engagement state of the plug and the socket of the buckle of 1st Embodiment of this invention. It is a rear view which shows the engagement state of the plug and the socket of the buckle of 1st Embodiment. It is a bottom view which shows the engagement state of the plug of the buckle of 1st Embodiment and a socket. It is a perspective view of the socket of the buckle of 1st Embodiment. It is a front view of the socket of the buckle of 1st Embodiment. It is a rear view of the buckle socket of the first embodiment. It is a right side view of the buckle socket of the first embodiment. It is a bottom view of the buckle socket of the first embodiment. FIG. 5 is a sectional view taken along the line AA of FIG. FIG. 7 is a cross-sectional view taken along the line BB of FIG. It is a perspective view which shows the plug of the buckle of 1st Embodiment. It is a front view of the plug of the buckle of 1st Embodiment. It is a rear view of the plug of the buckle of 1st Embodiment. It is a perspective view which shows the buckle of the 2nd Embodiment of this invention. It is a rear view of the buckle socket of the second embodiment. It is a perspective view which shows the socket of the buckle of 2nd Embodiment. It is a perspective view which shows the buckle of the 3rd Embodiment of this invention. It is a rear view of the socket of the buckle of the third embodiment. It is a perspective view which shows the socket of the buckle of 3rd Embodiment. It is a perspective view which shows the buckle of the 4th Embodiment of this invention. It is a rear view of the buckle socket of the 4th embodiment. It is a perspective view which shows the socket of the buckle of 4th Embodiment.

Hereinafter, the buckle 10 of the first embodiment of the present invention will be described with reference to FIGS. 1 to 13. As shown in FIGS. 1 to 3, the buckle 10 is composed of a plug 12 and a socket 14 to which the plug 12 is fitted and locked, and is attached to a tape, a belt, or a pair of other members. And optionally connect and disconnect from each other. In the following description, the direction in which the plug 12 is inserted into or detached from the socket 14 is the front-back direction, the direction in which the plug 12 is inserted into the socket 14 is the forward direction, and the direction in which the connected plug 12 is detached from the socket 14 is the rear direction. The front-back direction is also the up-down direction on the paper surface of FIG. The direction in which the pair of operation holes 50 described later in the socket 14 face each other, the direction in which the pair of legs 20 of the plug 12 face each other is the left-right direction, and the left-right direction is also the left-right direction on the paper surface of FIG. The direction orthogonal to the left-right direction and 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 polyacetal, polyamide, or polypropylene. As shown in FIGS. 11 to 13, the plug 12 is further closer to the tip of the leg portion 20 inserted into the socket 14, the tip connecting portion 23 located at the tip portion 20a of the leg portion 20, and the tip connecting portion 23. It is provided with an engaging projection 22 which is an engaging portion integrally provided at the position. On the side opposite to the engaging protrusion 22, a mounting portion 24 provided integrally with the base end portion 20b of the pair of leg portions 20 is provided. The mounting portion 24 functions as a portion for inserting and connecting a tape, a belt, or other predetermined member.

The pair of leg portions 20 project from the mounting portion 24 symmetrically with each other, and each leg portion 20 includes an outer leg piece 25 and an inner leg piece 27, and has a tip at the tip in the projecting direction of the outer leg piece 25 and the inner leg piece 27. The connecting portion 23 is integrally provided, and the tips of the outer leg piece 25 and the inner leg piece 27 are connected to each other. The central portion of the outer leg piece 25 in the protruding direction bulges outward in the left-right direction, and the bulging portion serves as an operating portion 26 for disengaging the plug 12. The inner leg piece 27 is located inside the outer leg piece 25 in the left-right direction, and is formed to be thinner in the left-right direction than the outer leg piece 25. Further, the inner leg piece 27 is formed in a shape curved outward in the left-right direction with a curvature larger than that of the outer leg piece 25.

The tip connecting portion 23 provided at the tip portion 20a of the leg portion 20 is formed to be thinner in the front and back directions than the operating portion 26, and is located at the central portion in the thickness direction of the outer leg piece 25 and the inner leg piece 27. It extends in the front-back direction. The engaging protrusion 22 is located at the tip of the tip connecting portion 23 and is provided so as to project in both the front and back directions. The engaging projection 22 is provided with a locking step portion 22a facing the base end portion 20b side of the leg portion 20, and the locking step portion 22a is locked by the engaged portion 52 of the socket 14 described later. It is formed so as to be engaged with the step portion 52a.

On the base end portion 20b side of the pair of leg portions 20, the base ends of the outer leg piece 25 and the inner leg piece 27 are connected to each other by arm portions 28 extending integrally from both ends of the mounting portion 24. As a result, each leg portion 20 is formed to have a space 29 surrounded by the outer leg piece 25, the inner leg piece 27, the tip connecting portion 23, and the arm portion 28, respectively. Each arm portion 28 is located at both ends of the mounting portion 24 and is located at the base end portion 20b of the pair of leg portions 20, and is formed in a straight line inclined in the projecting direction of the leg portion 20 toward the central portion in the left-right direction. It is provided in a substantially V shape. The arm tip portions 28a facing each other in the central portion have a certain gap and face each other as the end portions of the slit 32 of the guide portion 30 described later.

A guide portion 30 for guiding the insertion operation of the plug 12 into the socket 14 is provided in the central portion in the left-right direction facing the arm tip portion 28a of each arm portion 28 in parallel with the protruding direction of the leg portion 20. The guide portion 30 faces the arm tip portion 28a in the left-right direction in parallel with each other, and integrally extends in the front-rear direction to form an elongated U-shape. The tip portion 30a of the guide portion 30 is connected to each other in the vicinity of the tip connecting portion 23 of the leg portion 20, and the space between the U-shapes of the guide portion 30 is formed as a slit 32. The position of the tip portion 30a is slightly closer to the base end portion 20b in the front-rear direction than the tip end of the tip connection portion 23 of the leg portion 20.

The mounting portion 24 is provided with a first bar 33 at the end of the plug 12 and a second bar 34 connecting the base end portions 20b of the pair of leg portions 20 in parallel in the left-right direction, and tape is inserted between them. The holes 24a are formed and integrally provided. Further, a space is also provided in the portion surrounded by the second bar 34 and the arm portion 28 to form the tape insertion hole 24b. The first bar 33 is formed equal to the width in the front-back direction of the mounting portion 24, and the second bar 34 is located on the front surface side of the mounting portion 24 in the front-back direction and is located in the front-back direction from the first bar 33. Is also thinly formed. There is.

The socket 14 is also integrally molded with a synthetic resin such as polyacetal, polyamide, or polypropylene. As shown in FIGS. 4 to 10, the socket 14 has a hollow fitting portion 40 into which the leg portion 20 of the plug 12 is inserted and a mounting portion 42 located on the opposite side of the fitting portion 40 from the insertion port 40a. Consists of. The mounting portion 42 is formed with a tape insertion hole 42a through which a tape, a belt, or other predetermined member is inserted, and is provided with a connecting bar 44 for connecting the tape member or the like.

In the fitting portion 40 of the socket 14, the upper surface portion 45 and the lower surface portion 46 face each other at a predetermined distance to form an insertion space for the plug 12. The ends of the upper surface portion 45 and the lower surface portion 46 on the insertion port 40a side are formed in a substantially V shape that is inclined toward the center of the insertion port 40a in the front-rear direction toward the center portion thereof. Side wall portions 48 facing each other are provided on the left-right side surfaces of the socket 14, and operation holes 50 are formed in the central portion of the side wall portion 48 in the front-rear direction to expose the operation portions 26 of the leg portions 20, respectively. .. The operation holes 50 are formed so as to be concavely curved so as to approach each other in the left-right direction, and the operation portion 26 is formed so as to be exposed in the left-right direction.

Guide grooves 56 for guiding the insertion operation of the plug 12 are formed on the inner surfaces of the upper surface portion 45 and the lower surface portion 46 of the fitting portion 40 in succession from the insertion port 40a. The guide groove 56 is provided in the front-rear direction from the insertion port 40a, and the insertion port 40a side is formed in a wide trumpet shape, and the guide portion 30 is fitted to guide the sliding operation in the front-rear direction. At a position near the mounting portion 42 in the upper surface portion 45 and the lower surface portion 46 of the fitting portion 40, a pair of engaged portions 52 in which the pair of engaging protrusions 22 are engaged are placed in the space inside the fitting portion 40. , Protruding in the front and back directions so as to face each other. Each engaged portion 52 includes a locked step portion 52a in which the locking step portion 22a of the engaging protrusion 22 is engaged with each other facing each other, and the locking step portion 22a and the locked step portion 52a are leg portions. It is provided with a surface orthogonal to the protruding direction of 20. Each engaged portion 52 is formed with a side surface portion 52b which is a surface which is inclined in the front-rear direction and is provided so as to approach each other toward the mounting portion 42. When the plug 12 is inserted, the side surface portion 52b abuts on the engaging protrusion 22 and elastically deforms the leg portions 20 in a direction in which they approach each other.

The lower surface portion 46 is provided with a pair of through holes 54 opened in the front and back directions in the vicinity of the tape insertion holes 42a, and the edge portion of the through holes 54 on the insertion port 40a side is the peripheral edge portion of each engaged portion 52. It is provided flush with each other. The end face of the socket 14 on the tape insertion hole 42a side is closed by the end face wall portion 60, and an opening 62 that communicates with the tape insertion hole 42a in the fitting portion 40 is formed in the central portion of the end face wall portion 60. Has been done. The opening 62 opens in the front-rear direction with a width between the upper surface portion 45 and the lower surface portion 46 of the socket 14, and the width in the left-right direction is formed to be narrower than the distance between the inner edges of the pair of through holes 54 facing each other. There is.

In the opening 62, the opening recess 58 is continuously formed in a concave shape from the end edge on the mounting portion 42 side of the lower surface portion 46. The opening recess 58 is provided only on the lower surface portion 46, and is covered by the end portion of the upper surface portion 45 on the mounting portion 42 side. The opening recess 58 is formed equal to the width of the opening 62 in the left-right direction and is located between the through holes 54. Therefore, a side edge portion 64, which is a part of the lower surface portion 46, is formed between each through hole 54 and the opening recess 58. Further, the width W1 in the left-right direction of the opening recess 58 is formed narrower than the width W2 in the left-right direction between the opposing side surfaces of the pair of legs 20, and the position of the opening recess 58 is the position of the pair of legs. The portion 20 is provided between the portions projected onto the lower surface portion 46 in which the opening recess 58 is formed. That is, as shown in the rear view of FIG. 2, the buckle 10 of this embodiment is formed symmetrically in the left-right direction, and the opening recess 58 is formed in the center of the lower surface portion 46 on the mounting portion 44 side in the left-right direction. A pair of legs 20 are located on both sides of the opening recess 58. Each of the through holes 54 is provided at a position where the engaging projection 22 can be exposed. In the buckle 10 of this embodiment, the opening recess 58 is formed on the lower surface portion 46, but when the opening recess 58 is formed on the upper surface portion 45, the opening recess 58 has a pair of legs 20 on the upper surface. It is provided between the portions projected on the portion 45.

Next, the engaging operation and usage of the buckle 10 of this embodiment will be described below. First, in order to attach a tape member or the like to the plug 12 of the buckle 10, an end portion of a tape member (not shown) for connection is inserted from the back surface side of the tape insertion hole 24b of the attachment portion 24 of the plug 12, and a second bar is used. It is inserted into the tape insertion hole 24a from the front surface side of the plug 12 through the outer circumference of the 34, is overlapped with its own tape member on the back surface side of the tape insertion hole 24a, and is pulled out with adjustable length. On the other hand, a tape member or the like (not shown) attached to the socket 14 is non-adjustably connected to one connecting bar 44.

As shown in FIGS. 1 and 2, the engagement between the plug 12 and the socket 14 is such that the leg portion 20 of the plug 12 faces the insertion port 40a of the fitting portion 40 of the socket 14, and the plug 12 is inserted into the socket 14. Push it in. When the leg portion 20 is inserted into the fitting portion 40, the outer surface of the engaging protrusion 22 of the leg portion 20 comes into contact with the side surface portion 52b of the engaged portion 52, and the legs 20 are once brought closer to each other. It is inserted while being elastically deformed. When the plug 12 is further pushed in, the engaging projections 22 are separated from the side surface portions 52b and the pair of elastically deformed leg portions 20 are returned to their original positions, and the locking step portions 22a of the engaging projections 22 of the pair of leg portions 20 are respectively. The engaging projection 22 and the engaged portion 52 are engaged with each other so as to face the locked step portion 52a of the engaged portion 52.

Even if foreign matter such as dust or snow is contained in the socket 14 when the plug 12 is inserted into the socket 14, the foreign matter in the socket 14 communicates with the tape insertion hole 42a as the plug 12 is inserted. It is discharged from the recess 58 and the opening 62.

To release the connection between the plug 12 and the socket 14, the pair of operating portions 26 are pressed from the outside to elastically deform the engaging projection 22 of the plug 12 to a position not facing the engaged portion 52 of the socket 14. Let me. In this state, when the plug 12 and the socket 14 are slightly relatively moved in the direction away from each other, the engaging projection 22 is engaged along the side surface portion 52b of the engaged portion 52 due to the elastic force of the leg portion 20. Leave to be pushed out of position. As a result, the engagement is easily released.

Further, even when foreign matter such as snow enters from the opening recess 58 or the opening 62 while the plug 12 and the socket 14 are engaged, the engaging projections 22 of the pair of legs 20 of the plug 12 are on the side from the opening recess 58. Since it is formed so as to sandwich the edge portion 64, the amount of foreign matter such as snow entering between the engaging protrusions 22 is reduced by the width of the side edge portion 64. As a result, when the plug 12 is disengaged, the legs 20 can easily swing in the direction of approaching each other by the width of the side edge 64, and the disengagement operation can be reliably performed. it can.

According to the buckle 10 of this embodiment, since the socket 14 is provided with the opening recess 58 and the opening 62 communicating with the tape insertion hole 42a, snow and dust that have entered the socket 14 when the plug 12 is inserted. Foreign matter such as the above can be easily discharged, and the engagement operation between the plug 12 and the socket 14 can be reliably performed. Further, even when foreign matter such as snow invades from the opening recess 58 or the opening 62 while the plug 12 and the socket 14 are engaged, the side edge portion between the engaging protrusions 22 of the pair of legs 20 of the plug 12 Foreign matter is less likely to enter by the width of 64, a swinging space for the plug 20 is formed, and the disengagement operation can be reliably performed.

Next, the second embodiment of the present invention will be described with reference to FIGS. 14 to 16. 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 70 of this embodiment is formed by an opening recess 72 communicating with the tape insertion hole 42a extending toward the insertion port 40a from the central portion of the lower surface portion 46 in the front-rear direction. The opening recess 72 is provided in a trapezoidal shape so as to slightly expand toward the tape insertion hole 42a, and the trapezoidal lower bottom portion communicates with the opening 62 on the end surface of the socket 14.

According to the buckle 70 of the present invention, the buckle 70 has the same action and effect as that of the above embodiment, and even when there is a foreign substance such as snow in the socket 14, it is easier to insert the plug 12, and the plug 12 is disengaged. Can be done reliably.

Next, the third embodiment of the present invention will be described with reference to FIGS. 17 to 19. Here, the same members as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. In the buckle 74 of this embodiment, the entire end surface of the socket 14 on the tape insertion hole 42a side is opened in the tape insertion hole 42a to form an opening 78, and the opening recess 76 is concavely continuous from the side edge of the opening 78. Is formed. Since the opening 78 is open to substantially the entire end surface of the socket 14 on the tape insertion hole 42a side, leaving both end edges 78a in the left-right direction, the tip of the engaging projection 22 of the leg 20 in the socket 14 is open. , Exposed to the opening 78. The width of the opening 78 in the left-right direction is formed wider than the distance between the side edges of the pair of through holes 54 on the opening recess 76 side.

According to the buckle 74 of the present invention, the buckle 74 has the same function and effect as that of the above embodiment, and the entire end surface of the socket 14 on the tape insertion hole 42a side is opened to the tape insertion hole 42a to form the opening 78. Even when there is foreign matter such as snow in the socket 14, the plug 12 can be easily inserted, and the plug 12 can be reliably disengaged.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 20 to 22. 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 80 of this embodiment is formed by having an opening recess 82 communicating with the tape insertion hole 42a extending toward the insertion opening 40a from the central portion of the lower surface portion 46 in the front-rear direction. The opening recess 82 is provided in a rectangular shape toward the tape insertion hole 42a, and the short side portion of the rectangle communicates with the opening 62 on the end surface of the socket 14.

According to the buckle 80 of the present invention, the buckle 80 has the same action and effect as that of the above embodiment, and even when there is a foreign substance such as snow in the socket 14, it is easier to insert the plug 12, and the plug 12 is disengaged. Can be done reliably.

The buckle of the present invention is not limited to each of the above embodiments, and the opening and the concave opening recess formed on the end surface of the socket on the tape insertion hole side are formed on the upper surface portion in addition to the lower surface portion of the socket. It may be formed or may be provided on both sides. The size and shape of the opening and the opening recess can be appropriately set, and it is sufficient that the opening and the opening recess are formed by communicating with the end face portion and the lower surface portion of the socket. The pair of through holes may also be formed on the upper surface portion, or may be formed on both the lower surface portion and the upper surface portion. Further, the pair of through holes may be formed by sandwiching the opening recess and the side edge portion having a predetermined width, respectively, and the width of the side edge portion can be appropriately set. Further, the engaging portion provided on the leg portion is provided on the base end side other than the tip end portion of the leg portion, and the engaged portion of the socket can be applied to a buckle provided on the inside of the side wall portion. ..

10, 70, 74, 80 Buckle 12 Plug 14 Socket 20 Leg 22 Engagement protrusion 24, 42 Mounting part 24a, 24b, 42a Tape insertion hole 40 Fitting part 40a Insertion port 44 Connecting bar 45 Top surface 46 Bottom surface 50 Operation Hole 52 Engagement part 54 Through hole 58, 72, 76, 82 Opening recess 60 End face wall part 62, 78 Opening 64 Side edge part

Claims (8)

It consists of a plug (12) and a socket (14) that are connectable to each other and each have a mounting portion (24, 42) that can be attached to a predetermined member.
The plug (12) is provided with a pair of legs (20), and an engaging portion (22) is formed at a position closer to the tip portion (20a) of the pair of legs (20).
In the socket (14), the upper surface portion (45) and the lower surface portion (46) face each other at intervals, and the plug (12) is attached to the end portions of the upper surface portion (45) and the lower surface portion (46). Has an insertion port (40a) into which the insertion port (40a) can be inserted, and a fitting portion (40) continuous from the insertion port (40a) is formed by the space between the upper surface portion (45) and the lower surface portion (46).
A pair of engaged portions (22) in which the engaging portion (22) engages with at least one of the inner surface of the upper surface portion (45) and the inner surface of the lower surface portion (46) forming the fitting portion (40). 52)
At least one of the upper surface portion (45) and the lower surface portion (46) is provided with a pair of through holes (54) that are open in the front-back direction and are continuous from the pair of engaged portions (52).
On the mounting portion (42) side of the socket (14), between the upper surface portion (45) and the lower surface portion (46), it communicates with the fitting portion (40) and faces the insertion port (40a). An opening (62,78) is formed
At least one of the upper surface portion (45) and the lower surface portion (46) on the mounting portion (42) side and in the central portion in the left-right direction communicates with the opening (62,78) and penetrates in the front-back direction. A concave opening recess (58,72,76,82) that is not opened is formed in the insertion port (40a), and the opening recess (58,72,76,82) is formed in the upper surface portion (45). ) And at least one pair of the through holes (54) of the lower surface portion (46), and between the through holes (54) and the opening recesses (58, 72, 76, 82). A side edge portion (64) formed by a part of the upper surface portion (45) or the lower surface portion (46) is provided, and the widths of the opening recesses (58, 72, 76, 82) in the left-right direction are the pair. A buckle characterized in that it is formed to be narrower than the distance between the side surfaces of the legs (20) facing each other in the left-right direction. The opening recesses (58, 72, 76, 82) are formed in one of the upper surface portion (45) and the lower surface portion (46), and the other of the upper surface portion (45) and the lower surface portion (46). The buckle according to claim 1, wherein the opening recess (58, 72, 76, 82) is covered with an end portion on the mounting portion (42) side. Claim 1 in which an end face wall portion (60) is provided on an end surface of the fitting portion (40) on the side of the mounting portion (42), and the opening (62) is formed in the end face wall portion (60). The buckle described. The buckle according to claim 1, wherein the opening (62) has a width in the left-right direction narrower than the distance between the side edges of the pair of through holes (54) on the opening recess (58) side. The buckle according to claim 1, wherein the opening (78) has a width in the left-right direction wider than the distance between the side edges of the pair of through holes (54) on the opening recess (76) side. The plug (12) has a guide portion (30) protruding in the front-rear direction between a pair of legs (20).
Claim that the tip of the guide portion (30) is located at the end edge of the opening recess (58) on the insertion port (40a) side in a state where the plug (12) and the socket (14) are engaged. The buckle described in 1. The end face wall portion (60) is formed by connecting the upper surface portion (45) and the lower surface portion (46) at the end edge of the side edge portion (64) on the mounting portion (42) side. The buckle according to claim 3. The buckle according to claim 1, wherein the opening (62,78) is open over the entire width between the front and back surfaces of the fitting portion (40).

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