JP2012250045A - Buckle provided with lock mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buckle for a product that requires a strong fastening force.SOLUTION: The buckle is adapted such that a band can approach the buckle but cannot retreat in a locked state where an engagement prong 21 of the buckle 11 is engaged with a serrated engagement groove formed on the outer surface of the band. The buckle includes a buckle body having a bottom plate 11 and a top frame 12, and both side plates that connect the facing bottom plate and top frame, with the interior serving as an insertion space for the band, and an operation plate 20 horizontally installed inside the top frame and having, at the lower face of one end, the engagement prong that can be engaged with the engagement groove of the band, while forming the other end as a pressing part for releasing the engagement. The operation plate is supported by a connecting shaft 25 for connecting both side plates at an intermediate point between the engagement prong and the pressing part. The operation plate is thereby swingable around the intermediate point serving as a fulcrum. A sliding piece horizontally movable on the upper part of the operation plate is installed at the buckle body 14, and the swing of the operation plate is regulated in a state where the sliding piece 40 has moved to one end side of the operation plate.

Description

  The present invention relates to a buckle for locking a band or belt having an engagement groove, and particularly for products that require a relatively strong fastening force, such as athletic shoes, competition shoes, snowboard shoes, and protector locking belts. For a synthetic resin buckle.

Conventionally, a buckle is known in which an engagement groove is provided in a band (or belt), a hook of a buckle is elastically engaged with the groove, and the locked state can be released at any time.
In Japanese Patent No. 3989555 (Patent Document 1), the inventors of the present invention are an easy-to-manufacture and lightweight synthetic resin buckle that includes an opposing bottom plate, a ceiling frame, and both side plates that connect the two, and the interior is related. A buckle body which is a space for inserting a band having a mating groove, an engagement claw which is horizontally installed on the inner side of the ceiling frame and can be engaged with the engagement groove of the band on the lower surface of the one end, and the other end An operation plate having an upper surface as a pressing portion, and connecting the operation plate to two opposite sides of the ceiling frame at the intermediate point between the engaging claw and the pressing portion. A synthetic resin buckle that is freely swingable as a synthetic resin provided with a pair of hooking projections on the outer surface of the band and the ceiling frame, and the band can be pulled to the buckle body with a fingertip of one hand. Proposed buckle made.

  The synthetic resin buckle is very excellent in function and is optimal as a headband buckle for helmets, but in order to improve the operability in engagement / release of the operation plate, a connecting shaft that supports the operation plate is used. When it is thinned, when this is applied to a product that requires a relatively strong fastening force, such as athletic shoes, a strong force acts in the direction of pulling the band away from the buckle when the band and the buckle are locked. There was a possibility that the connecting shaft was damaged.

  In addition, in the patent No. 4005109 (Patent Document 2), the present inventors have a light and simple configuration as a band and buckle slide adjuster particularly suitable for use as clothing and the like, and the buckle portion is not conspicuous. As a slide adjuster having an appearance, a band and a buckle that engage with a hook-like engagement claw formed in a serrated engagement groove formed on the outer surface of the band and in which the band is accessible to the buckle but cannot be retracted. In the slide adjuster of the present invention, the buckle comprises a bottom plate, a ceiling frame, and both side plates connecting the two, and a buckle main body having a band insertion space inside, and is horizontally installed inside the ceiling frame, and has a bottom surface at one end. And an operation plate having an engaging claw that can be engaged with the engaging groove of the band, and having the other end as a pressing portion for releasing the engagement. And the support plate is supported by a connecting shaft that connects the both side plates at an intermediate point between the engaging claw and the pressing portion, thereby allowing the operation point to swing around the intermediate point, and the outer surface of the band. The pressing portion is provided with a pair of latching projections capable of pulling the buckle and the band with the fingertips of one hand, and the latching projections with respect to the operation plate extending from the connecting shaft to the latching projections The member which provided the member which regulates that the pressing force of a perpendicular direction acts directly on a part other than is proposed in the buckle main part.

  Since this slide adjuster is provided with a regulating member, there is no risk of inadvertent or sudden unlocking, but it is not necessary to unlock the pressing force that acts directly on the pressing part or the latching protrusion. It cannot be prevented.

Japanese Patent No. 3982955 Japanese Patent No. 4005109

The present invention provides a buckle with a lock mechanism that can prevent unlocking even against a pressing force that directly acts on the pressing portion or the latching protrusion, in addition to being lightweight and easy to manufacture. It is the purpose.
The present invention also provides a synthetic resin buckle that does not damage the connecting shaft that supports the operation plate even if a strong force acts in the direction of separating the band from the buckle when the band and the buckle are locked. It is intended to do.

  The present invention relates to a buckle in which the engagement claw of the buckle is engaged with a serrated engagement groove formed on the outer surface of the band, and the band can be retracted but cannot be retracted in the locked state. The buckle is composed of an opposing bottom plate, a ceiling frame, and both side plates that connect the two, and a buckle main body having a band insertion space inside, and is horizontally installed inside the ceiling frame. An operation plate having an engaging claw engageable with the groove and having the other end portion as a pressing portion for releasing the engagement, and the operation plate is located between the engaging claw and the pressing portion. In the buckle that is swingable around the intermediate point by being supported by a connecting shaft that connects the both side plates at a point, a slide piece that can move in the horizontal direction above the operation plate is installed in the buckle body. The slide piece is the operation plate. Swinging of the operation plate, characterized in that it is restricted in a state that has moved to one end side.

  It is preferable that slide grooves for guiding the movement of the slide piece are provided on both side plates of the buckle.

It is preferable that the lower surface of the slide piece is set to be slightly higher than the upper surface of the one end portion of the operation plate in a state where the slide piece is moved to the one end portion side of the operation plate.
In a state where the slide piece is moved to the one end portion side of the operation plate, the lower surface of the slide piece is preferably in contact with the upper surface of the one end portion of the operation plate.

In a state where the slide piece is moved to one end side of the operation plate, it is preferable that the lower surface of the slide piece abuts on the upper surface of the operation plate where the connecting shaft is located.
In a state where the slide piece is moved to the pressing portion side, it is preferable that the lower surface of the slide piece abuts on the upper surface of the pressing portion.
It is preferable that a latching protrusion is provided on the slide piece.

  The present invention relates to a buckle in which the engagement claw of the buckle is engaged with a serrated engagement groove formed on the outer surface of the band, and the band can be retracted but cannot be retracted in the locked state. The buckle is composed of an opposing bottom plate, a ceiling frame, and both side plates that connect the two, and a buckle main body having a band insertion space inside, and is horizontally installed inside the ceiling frame. An operation plate having an engaging claw engageable with the groove and having the other end portion as a pressing portion for releasing the engagement, and the operation plate is located between the engaging claw and the pressing portion. A buckle that can be swung with the intermediate point as a fulcrum by being supported by a connecting shaft that connects the two side plates at a point, and a stopper that can move vertically between the ceiling frame and the bottom plate is installed on the buckle body The stopper is the bottom Engagement of the band and buckle in a state that has moved to the side, characterized in that the assisted.

It is preferable that an engagement claw that can be engaged with the engagement groove of the band is provided on the lower surface of the stopper.
It is preferable that a slide groove for guiding the movement of the stopper is provided on both side plates of the buckle.

  In addition to locking by the restoring force of the synthetic resin in the locked state of the engaging claw and the engaging groove, a mechanism for locking the retreat of the band by pressing the engaging claw against the engaging groove is provided. preferable.

  The present invention relates to a buckle in which the engagement claw of the buckle is engaged with a serrated engagement groove formed on the outer surface of the band, and the band can be retracted but cannot be retracted in the locked state. The buckle is composed of an opposing bottom plate, a ceiling frame, and both side plates that connect the two, and a buckle main body having a band insertion space inside, and is horizontally installed inside the ceiling frame. An operation plate having an engaging claw engageable with the groove and having the other end portion as a pressing portion for releasing the engagement, and the operation plate is located between the engaging claw and the pressing portion. In a buckle that is swingable with the intermediate point as a fulcrum by being supported by a connecting shaft that connects the both side plates at a point, the strength of the connecting shaft is kept strong by inserting a metal piece inside the connecting shaft. It is characterized by.

The buckle according to the present invention has a small number of components and is made of a synthetic resin, so that it is lightweight and inexpensive to manufacture. Further, unlocking can be prevented even against a pressing force that directly acts on the pressing portion or the latching protrusion.
Further, even when a strong force acts in the direction of pulling the band away from the buckle when the band and the buckle are locked, there is no possibility of damaging the synthetic resin connecting shaft. Therefore, this buckle is optimally applied to products that require a relatively strong fastening force such as athletic shoes.

1 is a perspective view of a buckle 10. FIG. It is the top view which shows the engagement state of the buckle 10 and the band 30, and a longitudinal direction vertical side view. It is the perspective view of other embodiment of a buckle, and the principal part vertical side view which shows the operation | movement. It is a perspective view of another embodiment of a buckle, and a principal part longitudinal section side view showing the operation. It is a perspective view of another embodiment of a buckle, and a principal part longitudinal section side view showing the operation. It is a perspective view of another embodiment of a buckle, and a principal part longitudinal section side view showing the operation.

Hereinafter, embodiments of a buckle with a lock mechanism according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a buckle 10. In these drawings, the buckle 10 is a flat plate comprising a bottom plate 11, a ceiling frame 12 facing the bottom plate 11, and side plates 13 and 13 connecting the bottom plate 11 and the ceiling frame 12. The main body is constituted by the cylindrical buckle body 14. The buckle body 14 is opened in the band sliding direction as insertion holes 15, 15, and the inside thereof becomes an insertion space 16 of the band 30 having an engagement groove described later.

  Although not shown, if the length of the bottom plate 11 in the longitudinal direction (the sliding direction of the band) is made longer than the length of the ceiling frame 12 in the longitudinal direction, the buckle 10 can be connected to the connected body (that is, an athletic shoe band or the like). Attachment can be facilitated and the band can be inserted smoothly. Further, the same effect can be obtained by configuring the ceiling frame 12 with a flat plate and extending the ceiling frame 12 facing the one end portion 20 </ b> A of the operation plate 20 horizontally in the direction opposite to the operation plate 20.

  On the inner side of the ceiling frame 12, an operation plate 20 having a size that fits in the ceiling frame 12 is horizontally installed. An engaging claw 21 that can engage with the engaging groove of the band 30 is provided on the lower surface of the one end 20 </ b> A of the operation plate 20, and the upper surface of the other end 20 </ b> B is a pressing portion 22. By making the operation plate 20 slightly lower than the ceiling frame 12, it is possible to prevent the pressing portion 22 from being inadvertently pressed down.

A connecting shaft 25 is formed at an intermediate portion in the longitudinal direction of the operation plate 20, and this connecting shaft 25 is supported on the upper inner walls of the side plates 13 and 13.
In this embodiment, the cross section of the connecting shaft 25 is rectangular, but it can be circular, elliptical, or other various cross sectional shapes. It is desirable that the connecting shaft 25 pivotally supports the operation plate 20 and is made as thin as possible in order to ensure smooth operability. Just do it.
Note that the connecting shaft 25 is not limited to the side plates 13 and 13, and even if connected to two sides of the facing ceiling frame 12, the connecting shaft 25 can exhibit the same operation as described below.

  Slide grooves 50 and 50 for sliding the slide piece 40 are formed on the side plates 13 and 13 of the buckle 10. 1 (2) and 1 (3) are perspective views showing a state in which the slide piece 40 moves along the slide grooves 50, 50. FIG. A latching protrusion 42 is provided on the surface of the slide piece 40 so as to protrude upward. In the present embodiment, the slide piece has a rectangular shape, but it does not have to be rectangular.

Next, the operation of the buckle 10 will be described with reference to FIG.
FIG. 2A is a plan view showing an engaged state of the buckle 10 and the band 30, and FIG. 2B is a longitudinal side view in the longitudinal direction.

2 (1) and 2 (2), the band 30 is inserted into the insertion space 16 of the buckle 10, and the engagement claw 21 of the buckle 10 is engaged with the engagement groove 31 formed on the outer surface of the band 30. doing. The engagement groove 31 has a sawtooth cross-sectional shape in the sliding direction, that is, a tapered surface that gradually becomes deeper in the traveling direction of the band 30 and a wall surface that rises substantially perpendicularly from the deepest position.
Reference numeral 35 denotes a latching protrusion provided on the outer surface of the band 30, and the band 30 is pulled toward the buckle 10 with one hand by placing a finger on both of the latching protrusions 42 provided on the surface of the slide piece 40. Is possible.

When the band 30 enters the insertion space 16 from the insertion port 15 on the pressing portion 22 side (left side in FIG. 2), the upper surface of the band 30 comes into contact with the engagement claw 21 of the operation plate 20, and the operation plate 20. The one end portion 20A of the band 30 is advanced while being pushed up, and the approach / separation position of the band 30 relative to the buckle 10 is adjusted.
In this state, as shown in FIG. 2 (2), since the engaging claw 21 is engaged with and locked with the predetermined engaging groove 31, the band 30 can be advanced with respect to the buckle 10, but it is retracted. It is impossible.

  Next, in order to retract or pull out the band 30 from the buckle 10, if the pressing portion 22 of the operation plate 20 is lightly pushed down with a finger, as shown in FIG. As a result of the rotation of the operation plate 20, the engaging claw 21 located on the opposite side is lifted and the engaging claw 21 is disengaged from the engaging groove 31, so that the band 30 can be freely slid. When the finger is released from the pressing portion 22, the operation plate 20 returns to the original horizontal state due to the elasticity of the synthetic resin.

Next, the locking mechanism of the present invention will be described.
As described above, FIG. 2 (2) shows a state in which the engagement groove 31 of the band 30 and the engagement claw 21 of the buckle 10 are locked. At this time, the slide piece 40 is placed on the other end 20B side of the operation plate. It is located, and the lock of the pressing part 22 is in a released state.
Here, if the slide piece 40 is slid along the slide grooves 50, 50 toward the one end portion 20 </ b> A of the operation plate 20 as shown in FIG. 1 (3), the rotation of the operation plate 20 is restricted by the slide piece 40. In this state, the pressing portion 22 does not move even if pressed. FIG. 2 (4) shows the locked state of the pressing portion 22.
The distance between the lower surface of the slide piece 40 in the locked state and the upper surface of the one end portion 20A of the operation plate 20 is a length that restricts the rotation of the operation plate 20 to the extent that the engagement claw 21 does not come off the engagement groove 31. good.

Another embodiment of the locking mechanism will be described with reference to FIG.
In the present embodiment, the lower surface of the slide piece 40 is set so as to contact the upper surface of the one end portion 20 </ b> A of the operation plate 20 in a state where the slide piece 40 is slid toward the one end portion 20 </ b> A side of the operation plate 20.
3 (1) is a perspective view of the buckle in this embodiment, and FIG. 3 (2) is the latched state of the buckle 10 and the band 30 as in FIG. FIG. 4 is a longitudinal sectional side view of a main part showing a locked state of a groove 31. If the slide piece 40 is slid from this state to lock the pressing portion 22, the lower surface of the slide piece 40 and the upper surface of the one end portion 20 </ b> A of the operation plate 20 come into contact with each other, and the engagement is located at the one end portion 20 </ b> A of the operation plate 20. The claw 21 is pushed down and meshes strongly with the engagement groove 31 of the band 30. FIG. 3 (4) is a longitudinal sectional side view of the main part showing this strong locked state.
Although not shown, the same effect can be obtained by setting the slide grooves 50 and 50 so that the position of the slide piece 40 gradually decreases in the direction of the one end 20A of the operation plate 20.

Next, another embodiment of the present invention will be described with reference to FIG.
FIG. 4A is a perspective view illustrating the slide piece 40 separated from the buckle body 14. This embodiment is different from the embodiment described so far in that the slide piece 40 does not move on the pressing portion 22, but the slide piece 40 can move to the pressing portion 22.

FIG. 4B is a vertical cross-sectional side view of the main part showing the locked state of the buckle 10 and the band 30, that is, the locked state of the engaging claw 21 and the engaging groove 31.
From this state, if the slide piece 40 is slid and locked onto the pressing portion 22 as shown in FIG. 4 (3), the lower surface of the slide piece 40 presses the upper surface of the pressing portion 22 and the connection shaft 25 is centered. As a result of the rotation of the operation plate 20, the engaging claw 21 located on the opposite side is lifted and the engaging claw 21 is disengaged from the engaging groove 31, so that the band 30 can be freely slid.
In the present embodiment, as long as the slide piece 40 is locked onto the pressing portion 22, the band 30 can be freely retracted or pulled out from the buckle 10 with one hand.
As to the locking method, as described above, the slide piece 40 may be slid and locked to the one end portion 20A side of the operation plate 20. FIG. 4 (4) is a longitudinal sectional side view of the main part showing the locked state.

  In this embodiment, when the buckle 10 and the band 30 are locked, the end surface of the other end portion 20B of the operation plate 20 has a length that comes into contact with the vertical surface of the ceiling frame 12 and is in a butted state. A function of preventing damage to the connecting shaft 25 against a strong force separating the band 30 from the buckle 10 is provided. Hereinafter, this operation will be described.

  When a strong force is applied in the direction in which the band 30 is separated from the buckle 10 in the engaged state of the band 30 and the buckle 10, the engaging claw 21 is engaged with the engaging groove 31. 4 (2) or (4), the operation plate 20 is pulled leftward and the operation plate 20 also moves leftward. However, as a result of the other end portion 20B of the operation plate coming into contact with the vertical surface of the ceiling frame 12, the operation plate 20 The movement stops.

The other end 20B of the operation plate and the ceiling frame 12 do not necessarily have to be in contact with each other in the engaged state of the band 30 and the buckle 10, and abut each other when a strong force acts in the direction of separating the band 30 from the buckle 10. The same effect can be obtained if a gap is formed so as to be in a state.
That is, the distance of the gap is shorter than the movable distance of the connecting shaft 25 that causes damage when a force in the left direction (direction from one end 20A to the other end 20B of the operation plate 20) is applied to the operation plate 20. Is set. Although it depends on the thickness and shape of the connecting shaft 25 and the type of synthetic resin described below, it is usually 1 mm or less.

Next, another embodiment of the present invention will be described with reference to FIG.
FIG. 5A is a perspective view showing the slide piece 40 separated from the buckle body 14, and FIG. 5B is a state where the buckle 10 and the band 30 are locked, that is, the engagement claw 21 is engaged. FIG. 4 is a longitudinal sectional side view of a main part showing a locked state of a groove 31. If the slide piece 40 is slid from this state as shown in FIG. 5 (3), the rotation of the operation plate 20 is restricted by the slide piece 40, and at the same time, the connecting shaft 25 is pressed by the slide piece 40 from above. Therefore, even if a strong force acts in the direction in which the band 30 is separated from the buckle 10, damage to the connecting shaft 25 can be prevented. FIG. 5 (4) is a vertical cross-sectional side view of the main part showing a state in which the engaging claw 21 is disengaged from the engaging groove 31 as in FIG. 4 (3).

Next, a mechanism for assisting the engagement between the band 30 and the buckle 10 by the stopper 60 provided on the buckle body 14 will be described with reference to FIG.
FIGS. 6A and 6B are perspective views showing a state in which the stopper 60 moves along the slide grooves 62 and 62.
FIG. 6 (3) is a vertical cross-sectional side view of the main part showing the locked state of the buckle 10 and the band 30, that is, the locked state of the engaging claw 21 and the engaging groove 31. In the present embodiment, an engagement claw 61 that can be engaged with the engagement groove 31 of the band is provided on the lower surface of the stopper 60.
6 (4), the stopper 60 is slid along the slide groove 62 toward the bottom plate 11, and the engagement claw 61 and the engagement groove 31 of the band are engaged with each other. And the engagement of the buckle 10 can be reinforced. That is, since the stopper 60 is provided on the buckle body 14, even if a strong force acts in the direction of separating the band 30 from the buckle 10, the buckle body 14 receives the force, so that the engagement between the band 30 and the buckle 10 is performed. It becomes possible to make it stronger.

The buckle 10 can be molded from a flexible synthetic resin, and in particular, since the operation plate 20 needs to be swung around the connecting shaft 25, elasticity such as polyacetal, polyoxymethylene, polyamide, polycarbonate, nylon, etc. It is preferable to mold with a synthetic resin having The buckle 10 of the present invention is composed of a small number of parts and can be easily integrally molded with a mold because of its simple structure.
Further, the strength of the connecting shaft 25 can be increased by forming a metal piece inside the connecting shaft 25 after the buckle 10 is molded with a synthetic resin. For example, by providing a hole in the center of the connecting shaft 25 and inserting a metal shaft into the hole, it is possible to prevent the connecting shaft from being damaged when a strong force acts in the direction of separating the band 30 from the buckle 10. it can.

  In the present invention, in the embodiment shown in FIG. 4, it is essential for the ceiling frame 12 to have one side facing the other end 20 </ b> B of the operation plate 20, but the ceiling frame 12 is not necessarily limited to one having four sides. About the side facing the one end 20A of the operation plate 20, this can be omitted when the buckle is reduced in weight and size.

The buckle 10 of the present invention can incorporate the elements disclosed in Patent Document 1 and Patent Document 2 described above. For example, instead of the connecting shaft 25, a connecting side (not shown) that connects the upper edge portion of the operation plate 20 and the upper portion of the ceiling frame 12 may be used.
Further, in order to easily restore the operation plate 20 to a horizontal state, a connection member (not shown) that connects the one end 20 </ b> A of the operation plate 20 to the ceiling frame 12 facing the operation plate 20 may be provided. Further, a band presser (not shown) for preventing the band 30 from lifting can be provided in the insertion space 16.

DESCRIPTION OF SYMBOLS 10 Buckle 11 Bottom plate 12 Ceiling frame 13 Side plate 14 Buckle body 16 Insertion space 17 Slide groove 20 Operation plate 20A One end portion 20B of the operation plate The other end portion 21 of the operation plate 21 Engaging claw 22 Pressing portion 25 Connecting shaft 30 Band 31 Engaging groove 40 Slide piece 50 Slide groove 60 Stopper

Claims (12)

A buckle that engages with an engagement claw of a buckle in a serrated engagement groove formed on the outer surface of the band, and in the locked state, the band is accessible to the buckle but cannot be retracted. A buckle body comprising a bottom plate, a ceiling frame, and both side plates connecting the two, and the inside of which is inserted into the band, and is horizontally installed inside the ceiling frame, and engages with an engagement groove of the band on the lower surface of one end An operation plate having a possible engaging claw and having the other end portion as a pressing portion for releasing the engagement, and the operating plate is located at an intermediate point between the engaging claw and the pressing portion. In a buckle that can be swung with the intermediate point as a fulcrum by supporting it with a connecting shaft connecting both side plates,
A slide piece that can move in the horizontal direction on the upper portion of the operation plate is installed in the buckle body, and swinging of the operation plate is restricted in a state where the slide piece is moved to one end side of the operation plate. Characteristic buckle.   The buckle according to claim 1, wherein slide grooves for guiding the movement of the slide piece are provided on both side plates of the buckle.   3. A state in which the lower surface of the slide piece is set to be slightly higher than the upper surface of the one end portion of the operation plate in a state where the slide piece is moved to the one end portion side of the operation plate. The listed buckle.   3. The buckle according to claim 1, wherein a lower surface of the slide piece abuts on an upper surface of the one end portion of the operation plate in a state where the slide piece is moved toward the one end portion side of the operation plate.   The state according to claim 1, wherein the lower surface of the slide piece abuts on the upper surface of the operation plate where the connecting shaft is located in a state where the slide piece is moved to one end side of the operation plate. The buckle according to any one of the above.   The buckle according to any one of claims 1 to 5, wherein a lower surface of the slide piece abuts on an upper surface of the pressing portion in a state where the slide piece is moved to the pressing portion side.   The buckle according to any one of claims 1 to 6, wherein a latching protrusion is provided on the slide piece. A buckle that engages with an engagement claw of a buckle in a serrated engagement groove formed on the outer surface of the band, and in the locked state, the band is accessible to the buckle but cannot be retracted. A buckle body comprising a bottom plate, a ceiling frame, and both side plates connecting the two, and the inside of which is inserted into the band, and is horizontally installed inside the ceiling frame, and engages with an engagement groove of the band on the lower surface of one end An operation plate having a possible engaging claw and having the other end portion as a pressing portion for releasing the engagement, and the operating plate is located at an intermediate point between the engaging claw and the pressing portion. In a buckle that can be swung with the intermediate point as a fulcrum by supporting it with a connecting shaft connecting both side plates,
A stopper capable of moving vertically between the ceiling frame and the bottom plate is installed on the buckle body, and the engagement between the band and the buckle is assisted in a state where the stopper is moved to the bottom plate side. buckle.   The buckle according to claim 8, further comprising an engaging claw engageable with an engaging groove of the band on a lower surface of the stopper.   The buckle according to claim 8 or 9, wherein slide grooves for guiding the movement of the stopper are provided on both side plates of the buckle.   A mechanism for locking the retraction of the band by pressing the engaging claw against the engaging groove in addition to the locking by the restoring force of the synthetic resin in the locked state of the engaging claw and the engaging groove. The buckle according to any one of 1 to 10. A buckle that engages with an engagement claw of a buckle in a serrated engagement groove formed on the outer surface of the band, and in the locked state, the band is accessible to the buckle but cannot be retracted. A buckle body comprising a bottom plate, a ceiling frame, and both side plates connecting the two, and the inside of which is inserted into the band, and is horizontally installed inside the ceiling frame, and engages with an engagement groove of the band on the lower surface of one end An operation plate having a possible engaging claw and having the other end portion as a pressing portion for releasing the engagement, and the operating plate is located at an intermediate point between the engaging claw and the pressing portion. In a buckle that can be swung with the intermediate point as a fulcrum by supporting it with a connecting shaft connecting both side plates,
The buckle characterized by keeping the strength of the connecting shaft strong by putting a metal piece inside the connecting shaft.

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