This application is a national stage application of PCT/JP2009/071668 which claims priority to PCT/JP2009/056634, both of which are incorporated herein by reference.
The present invention relates to a side release buckle configured to, for instance, connect belts, the side release buckle including a pair of lock arms on both sides thereof.
There has been typically used a buckle that detachably engages a plug with a socket in order to couple string members (e.g., belts) in various applications (e.g., clothes, bags, shoes and packages).
Such a buckle requires easy handling for coupling and releasing as well as no accidental release when the buckle is not intended to be released. As a product that satisfies such needs, a side release buckle including a pair of lock arm on both sides thereof has been used.
For instance, a side release buckle disclosed in Patent Literature 1 or 2 includes a plug and a socket, each of which is provided with a belt attachment.
The plug includes a base including the belt attachment and a pair of legs (lock arms) on both sides near the socket. The socket includes a hollow cylindrical body, the body having a housing space (cavity) into which the plug is inserted from a plug-facing side of the body. An opening in communication with the housing space is formed on each side of the body of the socket. The plug and the socket can be disengaged by manipulating the legs exposed through the openings with fingers.
Among the above side release buckles, the side release buckle disclosed in Patent Literature 1 includes a prismatic guide bar between a pair of legs of the plug in order to stabilize a posture of the plug when the plug is inserted into the socket.
On the other hand, in the side release buckle disclosed in Patent Literature 2, a guiding function of a pair of legs is enhanced, whereby a guide bar is omitted. However, the side release buckle disclosed in Patent Literature 2 additionally includes a connecting belt configured to connect the pair of legs. The connecting belt, which is a member shaped in a thin plate, is integrally formed with the legs and the like. The connecting belt connects the pair of legs while being curved in a substantially U-shape. The connecting belt is configured to suppress excessively outward deformation of the legs to prevent breakage thereof.
These days, weight reduction of a buckle such as a side release buckle has been expected.
Since the entire side release buckle has already been molded in one piece by using a resin, weight reduction of the buckle is difficult in view of a material (the resin). For this reason, it has been demanded to reduce the material for each portion constituting the buckle.
From this point of view, the buckle disclosed in Patent Literature 2 in which the guide bar is omitted is more suitable for weight reduction than the buckle disclosed in Patent Literature 1 in which the plug is provided with the guide bar. On the other hand, there is a limit to thin the socket for reducing the material used for the socket because press strength of the socket needs to be secured. Accordingly, an arrangement of the buckle for achieving further weight reduction has been demanded.
An object of the invention is to provide a side release buckle with a reduced weight and a secured strength.
According to an aspect of the invention, a side release buckle includes: a plug; and a socket into which the plug is inserted for engagement, in which
the plug includes: a base being provided with a belt attachment; a pair of legs projecting from the base; an engaging portion being formed to each of the legs; and a connecting portion configured to connect the legs to each other,
the socket includes: a body being provided with a belt attachment and an insertion opening; a housing space being formed in the body and capable of housing the legs inserted from the insertion opening; an engaged portion being formed in the body and engageable with the engaging portion; and a cutout being formed from an edge of the belt attachment toward the insertion opening, and
the cutout is formed over an area surrounded by the pair of legs and the connecting portion when the pair of legs and the connecting portion are housed in the housing space while the engaging portion and the engaged portion are engaged.
According to the above aspect of the invention, a surface area of the body of the socket can be decreased by forming the cutout on the body to reduce a material for the body even with the same thickness as that of a body without a cutout. Accordingly, a weight of the buckle can be reduced.
While the engaging portion and the engaged portion are engaged, in other words, the plug is fit in the socket (in a normal coupling state), this cutout is formed by cutting out an interior of an area surrounded by the pair of legs and the connecting portion, for instance, in a concave shape. Since the cutout is thus formed, the pair of legs and the connecting portion are not exposed outward. Accordingly, while the weight of the buckle is reduced by the cutout, appearance quality is not deteriorated. The buckle can rather provide a lightweight impression since the buckle has increased open parts. Moreover, since neither the pair of legs nor the connecting portion comes out of the cutout, the legs or the connecting portion is prevented from being caught by other articles.
According to the above aspect of the invention, an outline of the cutout 25 is formed along an inner shape of the pair of legs and the connecting portion.
With this arrangement, the maximum cutout area can be formed such that neither the pair of legs nor the connecting portion is exposed out of the cutout, thereby realizing the maximum weight reduction.
According to the above aspect of the invention, an edge of the cutout near the insertion opening is formed to have a C-shape or U-shape outline.
With this arrangement, the cutout near the insertion opening is formed to have an outline in a C-shape (when the cutout is shallow) or in a U-shape (when the cutout is deep), whereby the outline of the cutout fits with an inner shape (typically, a C-shape or a U-shape) of the connecting portion and the legs of the plug. Since the innermost part of the cutout is shaped in an arc (a C-shape or a U-shape), the outline of the cutout has no steeply angled discontinuous portion, so that stress concentration and difficulties in formation can be avoided.
According to the above aspect of the invention, a protrusion projecting into the housing space is formed inside the body, and the protrusion is continuously formed along the edge of the cutout near the insertion opening.
With this arrangement, when the legs of the plug are inserted from the insertion opening for coupling, a tip end of the leg or the engaging portion is prevented from being exposed out of the cutout, and a pair of engaging portions are respectively guided to the engaged portions, whereby the plug can be smoothly inserted into the socket.
According to the above aspect of the invention, another cutout is formed in the body from the insertion opening toward the belt attachment.
With this arrangement, since the cutouts are provided near the belt attachment and near the insertion opening, the material for the body is minimized, so that production costs and the weight thereof can be reduced at the maximum.
Since the cutout near the belt attachment is formed deep and the cutout near the insertion opening is formed shallow, a remaining portion between the cutouts (a portion connecting left and right sides of the body) is positioned remote from the belt attachment (which also connects the left and right sides of the body), whereby torsional rigidity of the body can be attained.
Exemplary embodiments of the invention will be described below with reference to the attached drawings.
As shown in respective
As shown in the figures, the side release buckle 1 according to the first exemplary embodiment is used to couple and release ends of a string member. The buckle 1 includes the plug 10 integrally formed of a synthetic resin and the socket 20 also integrally formed of a synthetic resin. The plug 10 and the socket 20 may be formed of other materials such as metal in addition to the synthetic resin by other forming methods in addition to an injection forming.
In
The legs 12 extend in a lengthwise direction (an insertion direction of the plug 10 to the socket 20, i.e., a vertical direction in
The pair of legs 12 are gradually inclined in the direction approaching each other toward the tip ends of the legs 12 in the insertion direction and are curved with a predetermined clearance. Accordingly, the legs 12 can entirely receive elastic deformation force.
The engaging portion 14 is formed as a projection extending upward and downward (the top-bottom direction of the socket 20) from the tip end of each of the legs 12. The tip end of each of the legs 12 is T-shaped in a lateral side view. In other words, the engaging portion 14 is formed to the tip end of each of the legs 12 and a dimension in a top-bottom direction (a height) of the engaging portion 14 is formed larger than a height of each of the legs 12.
The belt attachment 19 is formed in a middle part of the base 11.
As shown in
In
The connecting portion 15 has portions that extend from the engaging portions 14 of the tip ends of the legs 12 toward the belt attachment 19 and approach each other to be connected, so that the connecting portion 15 is formed in a U-shape. The connecting portion 15 prevents the pair of legs 12 from being excessively expanded by external force.
A pair of guided portions 16 are provided between the pair of legs 12.
As shown in
As shown in
In
As shown in
A leading surface 24A is formed in the housing space 23 for leading the engaging portion 14 to the engaged portion 24 for engagement.
The leading surface 24A is a step continuously formed from a vicinity of each lateral end of the insertion opening 22 to the engaged portion 24 along an inner side of each of the top and bottom surfaces of the body 21. When the legs 12 are inserted from the insertion opening 22, the leading surfaces 24A function as a guide configured to lead the engaging portions 14 at the tip ends of the legs 12 to the engaged portions 24. In other words, the engaging portions 14, which are located at the tip ends of the legs 12 inserted from the insertion opening 22, are led along the leading surfaces 24 and approach each other when the pair of legs 12 are elastically deformed. When the engaging portions 14 reach the engaged portions 24, the legs 12 elastically deformed by the leading surfaces 24A are recovered, so that the engaging portions 14 fit in the engaged portions 24 for mutual engagement.
On the other hand, in order to disengage the engaging portions 14 from the engaged portions 24, a manipulation opening 27 is formed on the body 21. The manipulation opening 27 is formed on each of lateral sides of the body 21 and communicates with the housing space 23 inside the body 21. The manipulation opening 27 is positioned to expose a middle portion of each of the legs 12 inserted from the insertion opening 22. By pressing inward the legs 12 exposed out of the manipulation openings 27, the pair of legs 12 are elastically deformed to approach each other, whereby the engaging portions 14 are disengaged from the engaged portions 24 for mutual disengagement.
The body 21 includes an undulation 26 continuously formed in an insertion direction of the legs 12 substantially on a center of each of the top and bottom surfaces of the body 21.
As shown in
The undulation 26 is formed on each of the top and bottom surfaces of the body 21, whereby the body 21 is formed like a corrugated plate curved in a direction in which the centers of the opposing top and bottom surfaces approach. With this arrangement, strength is secured substantially at the centers where press force working in the top-bottom direction is most likely to be applied and cracks are likely to generate, and thus crush and cracks are effectively prevented.
The undulations 26 are positioned on the top and bottom surfaces of the body 21 to correspond to each other. The linear convexes 26B of the undulations 26 are positioned to fit in respective dents on the top bottom surfaces of the connecting frame 16A between the legs 12 inserted into the housing space 23. A gap between the linear convexes 26B is set smaller than the height of each of the engaging portions 14 and the height of each of the guided portions 16 (the dimension in the top-bottom direction). When the legs 12 are inserted, the engaging portions 14 and the guided portions 16 are guided along the undulation 26. The undulation 26 provides a guiding function to suitably guide the engaging portions 14 to the engaged portions 24 while adjusting a posture of the plug 10. At this time, owing to the dents on the top and bottom surfaces, the connecting frame 16A between the guided portions 16 can be inserted into the gap of the linear convexes 26B without interference with the linear convexes 26B.
A height of the housing space 23 into which each of the guided portions 16 is introduced is formed to fit with the height of each of the guided portion 16. While the guided portions 16 remain inserted in the housing space 23, when the socket 20 is pressed in the top-bottom direction, the guided portions 16 support the socket 20 and prevent excessive deformation such as crush in the top-bottom direction.
As shown in
The cutout 28 is a C-shaped shallow cutout extending from the insertion opening 22. While the innermost part of the cutout 28 is shaped in an arc, a part thereof connected to an edge of the insertion opening 22 is also shaped in a smooth arc. Such a smooth shape, namely, a shape without sharp irregularities prevents stress concentration on a specific part by external force and the like.
A C-shaped edge of the cutout 28 forms an outline along an inner shape of the connecting frame 16A formed to the base 11 of the plug 10. With this outline, while the cutout 28 is maximally enlarged, the base 11 is not exposed more than necessary.
With this arrangement of the cutouts 28, while the plug 10 and the socket 20 are engaged, a continuous through-hole is formed. The through-hole extends between the connecting frame 16A and the connecting bar 19B of the plug 10 from the cutout 28 on the top surface of the socket 20 to the cutout 28 on the bottom surface. The through-hole is shaped such that a distance of the through-hole in a width direction of the socket 20 is gradually decreased toward the insertion direction of the plug 10.
The cutout 25 is a U-shaped deep cutout extending from the belt attachment 29. While the innermost part of the cutout 25 is shaped in an arc, a part of the cutout 25 continuous to an edge thereof opposing the belt attaching 29 is also shaped in a smooth arc. The part is a later-described projection 25A on the top surface and is an end edge of the engaged portion 24 on the bottom surface. Such a smooth shape, namely, a shape without sharp irregularities prevents stress concentration on a specific part by external force and the like.
A U-shaped edge of the cutout 25 forms an outline along an outer shape of the legs 12 and the connecting portion 15. As described above, the tip ends of the pair of legs 12 are connected to each other by the connecting portion 15 to form a U-shaped inner shape in an entirety. The outline of the cutout 25 is formed in line with this shape. With this outline, while the cutout 25 is maximally enlarged, the legs 12 and the connecting portion 15 are not exposed.
With this arrangement of the cutout 25, while the plug 10 and the socket 20 are engaged, a continuous through-hole is formed. The through-hole extends between the pair of legs 12 and the connecting portion 15 of the plug 10 from the cutout 25 on the top surface of the socket 20 to the cutout 25 on the bottom surface. The through-hole is shaped such that a distance of the through-hole in a width direction of the socket 20 is gradually decreased toward a direction (a pulling direction of the plug 10) opposite to the insertion direction of the plug 10.
In the cutout 25 formed on the top surface of the body 21 among the cutouts 25, portions facing both edges of the belt attachment 29 are provided as projections 25A projecting along the belt attachment 29. The above-described engaged portions 24 near the top surface are covered by the projections 25A. The projections 25A prevent the belt inserted in the belt attachment 29 from being improperly lifted up.
The cutout 25 formed on the bottom surface of the body 21 includes no portion corresponding to the projections 25A. A part of an edge of the cutout 25 is formed along the step of each of the engaged portions 24, so that the engaged portions 24 are exposed from the bottom surface of the body 21.
As shown in
The protrusion 25B is a continuous protrusion having a substantially rectangular cross section and being integrally formed with the body 21. The protrusion 25B is continuously formed along the edge of the cutout 25 near the insertion opening 22. On the edge of the cutout 25, the protrusion 25B extends over a predetermined widthwise area from the center of the edge of the cutout 25 near the insertion opening 22 toward both ends thereof. This area corresponds to a part of an area through which the tip end of one of the legs 12 (the engaged portion 14) is likely to enter the cutout 25 when the legs 12 of the plug 10 are inserted from the insertion opening 22 of the socket 20 for coupling. This area is determined to be sufficient to block the engaging portion 14 when, for instance, the plug 10 is excessively tilted relative to the insertion direction (see
A height of the protrusion 25B is set such that a gap between the opposing protrusions 25B on the top and bottom surfaces is slightly larger than a height of the connecting portion 15 of the plug 10. Accordingly, when the plug 10 is inserted into the socket 20, the connecting portion 15 is provided between the protrusions 25B on the top and bottom surfaces. With this arrangement, while the plug 10 is coupled with the socket 20, the protrusions 25B on the top and bottom surfaces are aligned with the connecting portion 15, which gives a simple appearance.
As shown in
In this exemplary embodiment, the following advantages will be obtained.
Since the cutouts 25 and 28 are formed on the top and bottom surfaces of the body 21, the cutouts 25 and 28 respectively extending from the edges of the belt attachment 29 and the insertion opening 22 along the undulations 26, the material for the socket 20 can be further reduced, whereby reduction in production costs and the weight is further promoted.
Since the cutouts 25 and 28 are respectively formed to have a U-shaped or C-shaped shallow outline, the outlines of the cutouts 25 and 28 have no steeply angled discontinuous portion, so that stress concentration and difficulties in formation can be avoided.
Since the outlines of the cutouts 25 and 28 respectively fit with the legs 12 and the connecting portion 15 housed in the housing space 23 or the opening of the belt attachment 19, each of the cutouts can have the maximum area while the legs 12 and the connecting portion 15 are reliably covered.
The body 21 is provided with the cutout 25 extending from the belt attachment 29 and the cutout 28 extending from the insertion opening 22. Such provision of the cutouts near the belt attachment 29 and the insertion opening 22 can minimize the material for the body 21, thereby maximally reducing the production costs and the weight thereof.
For instance, an experimental result shows that an approximately 10% reduction in weight is achieved when the cutouts 25 and 28 are formed on an existing buckle.
Since the cutout 25 near the belt attachment 29 is formed deep and the cutout 28 near the insertion opening 22 is formed shallow, a remaining portion between the cutouts (a portion connecting left and right sides of the body 21) is positioned remote from the belt attachment 29 (similarly, connecting left and right sides of the body 21). Accordingly, while torsional rigidity of the body 21 can be attained, the guiding function for the legs 12 by the undulation 26 formed on the remaining portion can work at an earlier stage of the insertion operation.
The cutout 25 is provided with the projections 25A projecting along the belt attachment 29 at the portions facing both the ends of the belt attachment 29. Accordingly, the projections 25A can prevent the belt put into the belt attachment 29 from improperly being lifted up or dropping off the belt attachment 29 even when the opening facing the belt attachment 29 is enlarged by providing the cutout 25.
Since the outline of the cutout 25 is formed along the inner shape of the legs 12 and the connecting portion 15, neither the legs 12 nor the connecting portion 15 is exposed out of the cutout, so that, for instance, the legs 12 or the connecting portion 15 is prevented from being caught by other articles.
The protrusion 25B projecting into the housing space 23 is formed inside the body 21. Since the protrusion 25B is continuously formed over a predetermined area along the edge of the cutout 25 near the insertion opening 22, when the engaging portion 14 comes too close to the central axis of the socket 20, the protrusion 25B blocks the engaging portion 14 to prevent the plug 10 from being inserted into the socket 20 while the plug 10 being too tilted.
While the legs of the plug 10 is inserted from the insertion opening 22 of the socket 20 for coupling, when the plug 10 is too tilted relative to the insertion direction (see
With the undulation 26 formed on the body 21 of the socket 20, rigidity of the body 21 can be enhanced without changing a thickness thereof. Particularly, against such a possible deformation of the socket 20 of the side release buckle 1 caused by being crushed by press in the top-bottom direction, the undulation 26 generates bending rigidity based on the cross section thereof, thereby effectively suppressing deformation of the body 21. Particularly, because the undulations 26 are present substantially at the center which is easily cracked by force in a crushing direction, the socket 20 is prevented from cracking and becomes unlikely to be broken.
Moreover, since the undulations 26 reliably provide rigidity, a thickness of the socket 20 can be thinned, so that costs can be reduced by reduction in usage of synthetic resin materials and a weight of the buckle can be reduced.
Further, since the undulations 26 are formed in the insertion direction of the legs 12, the undulations 26 are configured to have no interference with an insertion operation of the legs 12 and also to have a guiding function for the engaging portions 14 of the legs 12 and the guided portions 16.
Each of the undulations 26 includes the linear concave 26A and the linear convex 26B, the linear concave 26A being formed on the outer surface of the body 21, the linear convex 26B being formed on the inner surface thereof. In other words, the undulations 26 are provided by forming the top and bottom surfaces of the body 21 in a corrugated plate. Accordingly, each of the undulations 26 has a substantially constant thickness on the top or bottom surface of the body to avoid an increase in weight and to reduce a possible generation of sink marks and the like in synthetic resin formation.
In addition, since the linear concave 26A is defined as the outer surface of the body 21, the body 21 has no outward projection, which gives a simple appearance of the body 21.
The undulations 26 are provided in a projecting manner between portions of the housing space 23 in which the legs 12 are housed. Accordingly, when the pair of legs 12 are inserted into the housing space 23, the legs 12 enter both the lateral portions of the undulations 26 without mutual interference. Consequently, a thickness (a dimension in the top-bottom direction of the buckle) of each of the legs 12 and the undulations 26 can be increased, which is effective in securing strength.
Moreover, the undulations 26 also serve as a guide to guide the engaging portions 14 to the engaged portions 24 when the legs 12 are inserted therein, which allows the plug 10 and the socket 20 to be easily and reliably engaged with each other.
A side release buckle 2 according to this exemplary embodiment includes the same plug 10 and the socket 20 as those in the first exemplary embodiment. According to this exemplary embodiment, although the cutout 25 is formed on the socket 20 near the belt attachment 29, the cutout 28 as shown in the first exemplary embodiment (see
Since the cutout 28 in
Modifications
It should be noted that the invention is not limited to the above arrangements of the exemplary embodiments but encompasses the following modifications.
A shape of each of the cutouts 25 and 28 is not limited to a U-shape or a C-shape, but may be a V-shape or rectangular. However, when the most inward parts of the cutouts 25 and 28 are shaped in an arc such as a U-shape or a C-shape, unnecessary stress concentration can be avoided and such a shape is suitable for attaining the strength.
The protrusion 25B and the connecting portion 15 may provide a stepwise surface. Specifically, the protrusion 25B may be withdrawn into the housing space 23 relative to the connecting portion 15, or the connecting portion 15 may be withdrawn into the housing space 23 relative to the protrusion 25B.
The protrusion 25B is not limited to the continuous protrusion having a rectangular cross section, but may be one having a semicircular cross section or a triangular cross section. Moreover, the protrusion 25B is not limited to the continuous protrusion, but may be a discontinuous protrusion.
The area over which the protrusion 25B extends on the edge of the cutout 25 may be determined as needed. Alternatively, the protrusion 25B may be omitted.
In addition, detailed shapes and structures of the plug 10 and the socket 20 can be changed as needed. A dimension, material, color, surface finish of each of the plug 10 and the socket 20 can be selected as needed in implementation of the invention.
Number | Date | Country | Kind |
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PCT/JP2009/056634 | Mar 2009 | WO | international |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/JP2009/071668 | 12/25/2009 | WO | 00 | 9/21/2011 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2010/113368 | 10/7/2010 | WO | A |
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