JP2011239808A - Buckle with locking mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buckle with a locking mechanism which can be prevented from unlocking caused by pressurizing force directly acting on a pressurization part or a locking protrusion in addition to being light in weight and easy to create.SOLUTION: The buckle is a plastic buckle making the engaging pawl of the buckle 10 with a sawtooth-shaped engagement groove formed in the outer surface of the band, allowing the band to freely approach the buckle 10 but prohibiting the band from moving back in a locking state. The buckle 10 includes: a buckle body 14 formed of a bottom plate 11, a ceiling frame 12 opposed to each other, and both side plates for connecting both, and the inside of which serves as an insertion space for the band; and an operation board horizontally installed inside the ceiling frame 12 and havingan operation board having the engaging pawl capable of engaging with the engagement groove of the band on the lower surface of one end thereof, and having the other end serving as the pressurization part 22 for disengagement. A shelf part received from the bottom plate side 11 is formed in the ceiling frame 12. The engaging state of the shelf part and the one end of a turning piece regulates swinging of the pressurization part 22.

Description

  The present invention relates to a buckle for locking a band or belt having an engagement groove, and in particular, a product that requires a relatively strong fastening force, such as athletic shoes, competition shoes, snowboard shoes, protector locking belts, and the like. It is related with the synthetic resin buckle for.

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 comprising an opposing bottom plate, a ceiling frame, and both side plates connecting the two, A buckle body that is an insertion space for a band having an engagement groove, an engagement claw that is horizontally installed on the inner side of the ceiling frame and that can be engaged with the engagement groove of the band on the lower surface of one end, and the other end An operation plate having a top surface as a pressing portion, and connecting the operation plate to two sides of the opposing ceiling frame at the intermediate point between the engaging claw and the pressing portion. A synthetic resin buckle that can swing freely as a fulcrum, and is provided with a pair of latching protrusions on the outer surface of the band and the ceiling frame that can draw the band to the buckle body with a fingertip of one hand. Proposed plastic buckle

  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 lightweight and simple configuration as a slide adjuster composed of a band and a buckle particularly suitable for use as clothing, etc. As a slide adjuster with an inconspicuous appearance, a band 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 In the slide adjuster of the buckle, the buckle is horizontally installed on the inside of the ceiling frame, the buckle body which is composed of an opposing bottom plate, a ceiling frame, and both side plates connecting both, and the inside is a band insertion space, There is an engaging claw that can be engaged with the engaging groove of the band on the lower surface of the part, and the other end is used as a pressing part for releasing the engagement. The operation 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 plate to swing around the intermediate point. A pair of latching protrusions that can draw the buckle and the band with a fingertip of one hand are provided on the outer surface and the pressing portion, and the operation plate extending from the connecting shaft to the latching protrusion It has been proposed that a buckle body is provided with a member for restricting the vertical pressing force directly acting on a portion other than the latching projection.

  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 synthetic resin buckle in which the engagement claw of the buckle is engaged with a serrated engagement groove formed on the outer surface of the band so that the band can approach the buckle but cannot retract in the locked state. The buckle is composed of an opposing bottom plate, a ceiling frame, and both side plates connecting the two, and a buckle main body having an inside of the band as an insertion space of the band, and horizontally installed on the inner side of the ceiling frame. An operating plate having an engaging claw engageable with the engaging groove of the band and having the other end as a pressing portion for releasing the engagement, the operating plate being connected to the engaging claw and the In a buckle that can be swung about the intermediate point by being supported by a connecting shaft that connects the both side plates or the ceiling frame at the intermediate point of the pressing part, the length in one direction is perpendicular to this Longer than 90 degrees on the pressing part A shelf that is movably installed and receives at least one end in the longitudinal direction of the rotating piece from the bottom plate side is formed on the ceiling frame, and the shelf and one end of the rotating piece The swinging of the pressing portion is restricted in the engaged state.

It is preferable that the buckle integrally includes a push button having a latching protrusion on the rotating piece.
It is preferable that the shelf part which receives the longitudinal direction both ends of the said rotation piece from the said baseplate side is formed in the opposing ceiling frame.

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.
Preferably, the shelf is formed as an inclined surface, and one end in the longitudinal direction of the rotating piece moves from the bottom plate side to the ceiling frame along the inclined surface when the rotating piece rotates.
When one end in the longitudinal direction of the rotating piece engages with the shelf, it is preferable that the one end is in contact with the ceiling frame on which the shelf is formed.

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.
Furthermore, even if a strong force acts on the band in the direction of pulling away from the buckle when the band and the buckle are locked, there is no possibility of damaging the connecting shaft made of synthetic resin. 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 a vertical side view which shows the operation | movement. It is the perspective view of another embodiment of a buckle, and a vertical side view which shows the operation | movement.

DESCRIPTION OF SYMBOLS 10 Buckle 11 Bottom plate 12 Ceiling frame 13 Side plate 14 Buckle main body 16 Insertion space 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 Push button 50 Rotating Piece 55 End 55A of Rotating Piece 50 End Surface 60 of End 55 Shelf 62 Inclined Surface

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 the buckle 10, and in FIGS. 1 (2) and (3), a push button 40 and a rotating piece 50 constituting the buckle 10 are shown separated from the buckle body 14 upward. FIG. 1A shows only the buckle body 14.

In FIG. 1, the buckle 10 is mainly composed of a flat and cylindrical buckle body 14 including 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 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.
In the present embodiment, the length of the bottom plate 11 in the longitudinal direction (band sliding direction) is made longer than the length of the ceiling frame 12 in the longitudinal direction so that the band 30 can be inserted smoothly.

  On the inner side of the ceiling frame 12, an operation plate 20 that is sized to fit within the ceiling frame 12 and is long in the sliding direction of the band 30 is installed horizontally. An engaging claw 21 (see FIG. 2 described later) that can be engaged with the engaging groove of the band 30 protrudes from the lower surface of the one end portion 20A of the operation plate 20, and the upper surface of the other end portion 20B is the pressing portion 22. It is said that. By setting the operation plate 20 at a position slightly lower than the ceiling frame 12, it is possible to easily install the rotating piece 50 that engages with the ceiling frame 12 on the pressing portion 22.

A connecting shaft 25 is formed in the middle portion of the operation plate 20 in the longitudinal direction, and the connecting shaft 25 is connected to two sides of the facing ceiling frame 12.
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 ceiling frame 12 and can exhibit the same action as described later even if it is supported on the upper inner walls of the side plates 13 and 13.

The push button 40 shown in FIGS. 1 (2) and (3) is not necessarily provided on the buckle 10, but by disposing it, the engagement release operation of the buckle 10 and the band 30 can be facilitated. In the present embodiment, the push button 40 has a substantially circular shape, but it does not have to be circular.
On the surface of the push button 40, a latching protrusion 42 is provided so as to protrude upward, and an unevenness 43 (see FIG. 2 described later) for preventing slipping is formed on the periphery.

A rotating piece 50 is fixed to substantially the center of the bottom surface of the push button 40, and the turning piece 50 is pivotally supported by a turning shaft 45 (see FIG. 2 described later) integrally with the push button 40.
In this embodiment, the rotation piece 50 is a flat piece whose length in the insertion direction of the band 30 is longer than the length in the direction orthogonal thereto, and can be rotated 90 degrees on the pressing portion 22 by the rotation shaft 45. Is provided. If the rotation of 90 degrees is ensured, the shape of the rotating piece 50 is not particularly limited, but it is preferable to make the shape approximately the same as the pressing portion 22 in order to reduce the size of the buckle 10.

At the corners on the pair of diagonal lines of the rotating piece 50, the rotating piece 50 is rotated exactly 90 degrees by contacting stoppers 28, 28 projecting on the pressing portion 22 at the corresponding position. Notches 52, 52 that can be formed are formed.
On the other hand, on the ceiling frame 12, shelf portions 60, 60 that receive end portions 55, 55 in the longitudinal direction of the rotating piece 50 from the bottom plate 11 side are formed horizontally. The rack parts 60 and 60 should just be a magnitude | size which can support the rotation piece 50 from the baseplate 11 side.

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) show the engagement claw 21, the unevenness 43 for preventing slippage, and the rotation shaft 45 described above. In addition, about the member demonstrated previously, the same code | symbol is attached | subjected and the description is abbreviate | omitted (the following description is also the same).

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. is 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 to the buckle 10 with one hand by hooking both of the fingertips with the latching protrusion 42 provided on the surface of the push button 40. Is possible.

When the band 30 enters the insertion space 16 from the insertion port 15 on the push button 40 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 with respect 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 push button 40 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 positioned 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 push button 40, 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 the locked state of the engaging groove 31 of the band 30 and the engaging claw 21 of the buckle 10. At this time, the rotating piece 50 is as shown in FIG. 1 (2). Further, the shelf 60 of the ceiling frame 12 is not engaged and the push button 40 is unlocked.
Here, as shown in FIG. 1 (3), if the turning piece 50 is manually turned 90 degrees, both end portions 55, 55 in the longitudinal direction of the turning piece 50 are engaged with the shelves 60, 60. In this state, the push button 40 does not move even if it is pushed. As a result, the swing of the pressing portion 22 is restricted. FIG. 2 (4) shows the locked state of the push button 40. FIG.

Another embodiment of the locking mechanism will be described with reference to FIG.
In this embodiment, in addition to the locking by the restoring force of the synthetic resin in the locked state of the engaging claw 21 and the engaging groove 31, the engaging claw 21 is pressed against the engaging groove 3 to strongly retreat the band 30. It is something to lock.
FIG. 3A is a perspective view of the buckle main body 14 and an inclined surface in which the shelves 60 and 60 are gradually raised until both longitudinal end portions 55 and 55 of the rotating piece 50 reach a rotating position of 90 degrees. 62 and 62 are formed.

3 (2) is a perspective view showing the push button 40 and the rotating piece 50 separated from the buckle body 14, and FIG. 3 (3) is the relationship between the buckle 10 and the band 30 as in FIG. 2 (2). FIG. 4 is a vertical side view of a main part showing a stopped state, that is, a locked state of the engaging claw 21 and the engaging groove 31.
From this state, as shown in FIG. 3 (4), when the rotary piece 50 is rotated to lock the push button 40, both longitudinal ends 55, 55 of the rotary piece 50 extend along the inclined surfaces 62, 62. As a result of moving from the bottom plate 11 side toward the ceiling frame 12 and the pressing portion 22 of the operation plate 20 being lifted upward from the horizontal position, the engaging claw 21 positioned at one end portion 20A of the operation plate 20 is pushed down and the band 30 is moved. The engagement groove 31 is strongly engaged. FIG. 3 (5) is a longitudinal sectional side view of the main part showing this strong locked state.

Next, another embodiment of the present invention will be described with reference to FIG.
FIG. 4A is a perspective view illustrating the push button 40 and the rotating piece 50 separated from the buckle body 14. In this embodiment, while the embodiments described so far receive the longitudinal ends 55 and 55 of the rotating piece 50 by the shelves 60 and 60, the band 30 enters the insertion port 15 side. Only the shelf 60 formed on the ceiling frame 12 receives the longitudinal end 55 of the rotating piece 50.
The shape of the rotating piece 50 is the same as that of the pressing portion 22 as in the above embodiment, but since it is cantilevered, it has strength as a thick block shape. Along with this, a notch 56 is provided on the bottom surface of the rotating piece 50 to prevent the buckle body 14 from becoming large.

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, as shown in FIG. 4 (3), when the rotary piece 50 is rotated to lock the push button 40, the longitudinal end portion 55 of the rotary piece 50 extends along the inclined surface 62 on the bottom plate 11 side. As a result of moving from the horizontal direction toward the ceiling frame 12 and the pressing portion 22 of the operation plate 20 being lifted upward from the horizontal position, the engagement claw 21 positioned at one end portion 20A of the operation plate 20 is pushed down, and the engagement groove of the band 30 It meshes strongly with 31. FIG. 4 (4) is a longitudinal sectional side view of the main part showing this strong locked state.

  In this embodiment, when the longitudinal end 55 of the rotating piece 50 is engaged with the shelf 60, the end surface 55A of the end 55 contacts the vertical surface of the ceiling frame 12 on which the shelf 60 is formed. The length is such that the combined state is achieved, and the connection shaft 25 is prevented from being damaged by a strong force separating the band 30 from the buckle 10. 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. In FIG. 4 (4), the operation plate 20 is also moved leftward by being pulled leftward, but one end 55 in the longitudinal direction of the rotating piece 50 integrated with the operation plate 20 is formed with the shelf 60. As a result of the contact with the vertical surface of the ceiling frame 12, the movement of the operation plate 20 integrated with the rotating piece 50 stops.

One end portion 55 in the longitudinal direction of the rotating piece 50 and the ceiling frame 12 do not necessarily need to be in contact with each other when the push button 40 is locked, and are in contact with each other when a strong force acts in the direction of separating the band 30 from the buckle 10. If such a gap is formed, the same effect can be obtained.
That is, the distance of the gap is set to be shorter than the movable distance of the connecting shaft 25 that causes breakage 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 done. 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.

  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.

  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 piece (not shown) that connects the upper edge of the operation plate 20 and the upper part 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.

Claims (6)

A buckle made of a synthetic resin 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 is accessible to the buckle but not retractable in the locked state,
The buckle includes a bottom plate, a ceiling frame, and both side plates connecting the two, and a buckle main body having a band insertion space therein, and is horizontally installed inside the ceiling frame. An operation plate having an engaging claw engageable with the mating groove and having the other end as a pressing portion for releasing the engagement, and the operation plate is connected to 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 or the ceiling frame at the intermediate point,
A rotating piece whose length in one direction is longer than the length in a direction orthogonal thereto is rotatably installed on the pressing portion, and at least one end portion in the longitudinal direction of the rotating piece is attached to the bottom plate. A buckle characterized in that a shelf received from the side is formed on the ceiling frame, and swinging of the pressing portion is restricted in an engaged state between the shelf and one end of the rotating piece.
The buckle of Claim 1 which has integrally the pushbutton which has a latching protrusion on the said rotation piece.
The buckle according to claim 1, wherein a shelf that receives both longitudinal ends of the rotating piece from the bottom plate side is formed on a facing ceiling frame.
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 3.
The said shelf part is formed as an inclined surface, The longitudinal direction one end part of this rotation piece moves to the ceiling frame direction from the bottom-plate side along the said inclination surface at the time of rotation of the said rotation piece. Buckle with locking mechanism.
  The buckle according to any one of claims 1 to 5, wherein when one end portion in the longitudinal direction of the rotating piece engages with the shelf portion, the one end portion comes into contact with a ceiling frame on which the shelf portion is formed. .

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