JP3982955B2 - Synthetic resin buckle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a buckle for locking a band or belt having an engagement groove, and more particularly to a buckle used together with a helmet headband, watch band, bag or shoe band or belt.
[0002]
[Prior art]
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.
FIG. 7 shows a perspective view of a typical buckle of this type. The buckle body 1 is formed by a bottom plate 2 and side plates 3 and 3 in a substantially U-shaped cross section, and a shaft 4 is provided between the side plates 3 and 3. Is attached to the shaft 4, the coil spring 6 biases one end 5A of the lid piece 5 toward the bottom plate 2, and the other end 5B serves as a push operation portion. A mounting hole 7 or the like is provided for use on a bag main body, shoes, various bands, or the like.
[0003]
On the other hand, the belt paired with the buckle is provided with engaging grooves having a sawtooth cross section in the longitudinal direction, and the belt is inserted into a gap formed between the buckle body 1 and the lid piece 5. It is like that.
In the above buckle structure, the belt is inserted while pushing up the lid piece 5 against the elastic force of the coil spring 6, and when the insertion of the belt is stopped at an arbitrary tightening position, one end 5A of the lid piece 5 is engaged with the belt. The movement in the pulling-out direction is restricted by locking with the mating groove. To remove the belt, the other end 5B of the lid piece 5 is pushed down toward the buckle body 1 to lift the other end 5B from the engagement groove of the belt and release the engagement.
[0004]
The above-described conventional buckle has a drawback that the number of component parts is large and the assembling work becomes complicated. Further, since the buckle is made of metal, it has a drawback that it is not suitable for a buckle requiring weight reduction.
Further, since a mechanism for releasing the engagement with the belt by a pressing force directed from the upper side of the buckle body toward the bottom surface is employed, there is a possibility that the engagement between the buckle and the belt may be released due to unexpected contact or the like.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a synthetic resin buckle that is easy to manufacture and lightweight, and in particular, provides a synthetic resin buckle that is optimal as a headband buckle for a helmet.
[0006]
[Means for Solving the Problems]
The buckle made of a synthetic resin of the present invention is composed of a bottom plate and a ceiling frame that face each other and both side plates that connect both, and a buckle body that is an insertion space of a band having an engagement groove inside, and an inner side of the ceiling frame The operation plate is horizontally installed and has an engagement claw that can engage with the engagement groove of the band on the lower surface of one end portion, and has an upper surface of the other end portion as a pressing portion. And at the intermediate point of the pressing portion, respectively, are connected to two sides of the facing ceiling frame, respectively, so that the intermediate point can be swung as a fulcrum.
[0007]
The synthetic resin buckle is preferably integrally molded.
It is preferable to connect the ceiling frame and the operation plate with a connecting shaft connecting the two intermediate points.
It is preferable to connect the vicinity of one end of the operation plate and at least one side of the facing ceiling frame.
It is preferable to provide a pair of latching protrusions on the outer surface of the band and the ceiling frame so that the band can be drawn to the buckle body with a fingertip of one hand.
[0008]
[Action]
When the band is inserted into the insertion space of the buckle body from one insertion opening, the upper surface of the band comes into contact with the engaging claw of the operation plate, and moves forward while pushing up one end of the operation plate, The relative position is adjusted. In this state, since the engaging claw is engaged with and locked with the predetermined engaging groove, the band can be advanced with respect to the buckle but cannot be retracted.
On the other hand, in order to retract or pull out the band from the buckle, if the pressing part of the operation plate is pushed down, the engaging claw located on the opposite side rises and the locking with the engaging groove is released. You can slide the band freely.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the best embodiment of the synthetic resin buckle according to the present invention will be described with reference to the drawings.
[0010]
FIG. 1 is a perspective view of the buckle 10, FIG. 2 (a) is a plan view thereof, and FIG. 2 (b) is a longitudinal side view of the longitudinal direction. In these figures, the buckle 10 is mainly composed of a flat and cylindrical buckle body 14 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. Is done. 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 (the sliding direction of the band) is made longer than the length of the ceiling frame 12 in the longitudinal direction, so that the mounting holes 17 and 17 formed in the bottom plate 11 are illustrated in FIG. The buckle 10 is not easily attached to a connected body (that is, a helmet headband, a helmet band, etc.), and the band can be inserted smoothly.
[0011]
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 be engaged with the engaging groove of the band 30 is projected on the lower surface of one end portion of the operation plate 20, the upper surface of the other end portion is a pressing portion 22, and the central portion is more than the peripheral portion. A concave surface is preferred. By making the operation plate 20 slightly lower than the ceiling frame 12, it is possible to reliably prevent the pressing portion 22 from being inadvertently pressed down.
[0012]
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. In this embodiment, the cross section of the connecting shaft 25 is elliptical, but it can be circular or other various cross sectional shapes. The connecting shaft 25 supports the operation plate 20 so as to be swingable, and may have any shape as long as it is not damaged by repeated swinging. 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.
[0013]
The buckle 10 can be molded from a flexible synthetic resin, and particularly has elasticity such as polyacetal, polyoxymethylene, polyamide, and polycarbonate because the operation plate 20 needs to be swung around the connecting shaft 25. It is preferable to mold with a synthetic resin. 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 buckle 10 and the band 30 can be integrally molded.
[0014]
Next, the operation of the buckle 10 will be described with reference to FIG.
FIG. 3A shows a state in which 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. ing. 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 35B denotes a latching protrusion provided on the band 30, which will be described later.
[0015]
When the band 30 is made to enter the insertion space 16 from the insertion port 15 on the pressing portion 22 side (right side in FIG. 3), 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 band 30 moves forward while pushing up one end (the side on which the engaging claw 21 is formed), and the approach / separation position of the band 30 with respect to the buckle 10 is adjusted.
In this state, as shown in FIG. 3A, the engagement claw 21 is engaged with and locked with the predetermined engagement groove 31, so that the band 30 can be advanced with respect to the buckle 10, but is retracted. It is impossible.
[0016]
On the other hand, in order to retract the band 30 from the buckle 10 or pull it out, 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 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 pressing portion 22, the pressing portion 22 returns to the original horizontal state due to the elasticity of the synthetic resin.
[0017]
Next, another embodiment will be described with reference to a perspective view shown in FIG. However, the same members as those in the embodiment shown in FIG.
In this embodiment, the upper edge portion of the operation plate 20 and the upper portion of the ceiling frame 12 are connected by the connection pieces 27 and 27 at the position of the connection shaft 25 described above, and the operation plate is used with the connection pieces 27 and 27 as support shafts. 20 is swingable. Reference numeral 28 denotes a notch groove formed in the axial direction of the swing on the connecting pieces 27 and 27 in order to ensure the swing of the operation plate 20.
[0018]
In the present embodiment, one end of the operation plate 20 (the side on which the engaging claws 21 are provided) is connected to the facing ceiling frame 12. The connection is made by bent connection members 33 and 33 extending from the corners of the operation plate 20, and when the pressing portion 22 is pushed down and then the finger is released from the pressing portion 22, the operation plate 20 returns to the original horizontal position. It is easy to restore to the state. Therefore, in addition to this, various shapes such as corrugated plates can be applied as the shape of the connecting member 33. In other words, the connecting member 33 has a function as a damper for the swinging operation of the operation plate 20.
Further, if the operation plate 20 and the ceiling frame 12 are on the opposite side of the pressing portion 22 across the connecting shaft 25 (or the connecting piece 27), the side edge portion of the operation plate 20 other than the one end portion is used as the ceiling. The frame 12 may be connected. At that time, as shown in FIG. 5, a stopper 40 for contacting the ceiling frame 12 and preventing the one end from being pushed up more than necessary may be installed at the one end of the operation plate 20. desirable. In the embodiment of FIG. 5, the bottom plate 11 is formed into a curved surface along the head, arms, legs, trunk, and the like to be attached.
[0019]
Next, an embodiment in which the buckle 10 shown in FIG. 2 is modified will be described with reference to FIG.
In the present embodiment, first, a hooking projection 35 </ b> A is projected upward on the ceiling frame 12. The hooking protrusion 35A allows the band 30 to be pulled toward the buckle 10 with one hand by hooking the fingertip on both the hooking protrusion 35B provided on the outer surface of the band 30 shown in FIG. Is. Accordingly, the latching protrusions 35A and 35B may be any shape as long as they have a size and shape that can be hooked on the fingertip.
[0020]
At the center of the upper surface of the operation plate 20, a reinforcing rib 36 is provided in the longitudinal direction for ensuring the swinging motion of the operation plate 20. The rib 36 may be provided in the longitudinal direction along the upper edge portion of the operation plate 20 in addition to the center portion on the upper surface, or may be formed on the back surface (lower surface) of the operation plate 20.
[0021]
A stopper 37 is provided in the insertion space 16 of the buckle body 14 to prevent the other end portion (the side where the pressing portion 22 is provided) of the operation plate 20 from being pushed down more than necessary. In the present embodiment, the stopper 37 protrudes horizontally from the side plates 13 and 13 below the other end of the operation plate 20.
[0022]
Furthermore, in order to prevent the band 30 from floating in the insertion space 16, the engagement groove 31 of the band 30 is lifted and cannot be unlocked when the engagement claw 21 and the engagement groove 31 are unlocked. Band pressers 38, 38 are provided. In the present embodiment, the band presser 38 protrudes in a horizontal direction from the side plates 13 and 13 directly below the engaging claw 21.
[0023]
【The invention's effect】
The buckle according to claim 1 has a small number of components and is made of a synthetic resin, so that it is lightweight and inexpensive to manufacture. In addition, since the engagement claw is directly operated, the engagement release operation is reliable, and the operation plate is surrounded by a ceiling frame, so there is a risk of inadvertent or sudden unlocking. Absent. Further, since the operation plate is installed in parallel with the bottom plate, it becomes a very flat shape and a compact structure.
In particular, when this buckle is applied to a helmet headband, even if the buckle is deployed on the back of the head, the band size can be easily adjusted while wearing by a simple disengagement operation. It is ideal as a buckle for a helmet headband worn for head protection during construction work, civil engineering work, other various work, or during vehicle driving or athletics.
[0024]
The buckle according to the second aspect of the present invention is low in mold cost because the structure of the molding die is simple, and the buckle can be easily manufactured.
Since the buckle described in claim 3 has a connecting shaft, the operation plate installed in a horizontal state can reliably swing, and is robust enough to withstand repeated swinging motion. Can do.
[0025]
The buckle according to the fourth aspect of the present invention has a high restoring force of the swung operation plate, ensures a more reliable engagement / release operation, and can improve reliability.
According to the buckle of the fifth aspect, the slide adjustment of the band can be performed only with the fingertip of one hand, and the engaging operation can be performed quickly and easily.
[Brief description of the drawings]
FIG. 1 is a perspective view of a buckle.
2A is a plan view of the buckle shown in FIG. 1, and FIG. 2B is a longitudinal side view in the longitudinal direction.
FIG. 3 is a longitudinal side view for explaining the operation of the buckle.
FIG. 4 is a perspective view showing another embodiment of the buckle.
FIG. 5 is a longitudinal side view showing another embodiment of the buckle.
6A is a plan view showing the modified embodiment of the buckle shown in FIG. 2 (FIG. 6A), and FIG. 6B is a longitudinal side view thereof.
FIG. 7 is a perspective view showing a conventional example of a buckle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Buckle 11 Bottom plate 12 Ceiling frame 13 Side plate 14 Buckle main body 16 Insertion space 20 Operation plate 21 Engagement claw 22 Press part 25 Connection shaft 27 Connection piece 30 Band 31 Engagement groove 33 Connection member 35A, B Latch projection

Claims (6)

A buckle body comprising an opposing bottom plate, a ceiling frame, and both side plates connecting the two, the inside of which is an insertion space for a band having an engagement groove, is horizontally installed inside the ceiling frame, An operation plate having an engaging claw engageable with the engagement groove of the band and having the upper surface of the other end as a pressing portion ; at least one side of the ceiling frame that is near one end of the operation plate And the operation plate is connected to two opposite sides of the ceiling frame at the intermediate point between the engaging claw and the pressing portion, respectively, so that it can swing around the intermediate point as a fulcrum. Synthetic resin buckle.   The synthetic resin buckle according to claim 1, which is integrally molded.   The synthetic resin buckle according to claim 1 or 2, wherein the ceiling frame and the operation plate are connected by a connecting shaft connecting the two intermediate points.   A buckle body comprising an opposing bottom plate, a ceiling frame, and both side plates connecting the two, the inside of which is an insertion space for a band having an engagement groove, and is horizontally installed inside the ceiling frame, It has an engaging claw that can be engaged with the engaging groove of the band, and is composed of an operation plate having the upper surface of the other end as a pressing portion. , By connecting each of the two sides of the ceiling frame facing each other, the center point can be used as a fulcrum and the band can be swung around the outer surface of the band and the ceiling frame. A synthetic resin buckle provided with a pair of hooking projections that can be pulled.   The synthetic resin buckle according to claim 4, which is integrally molded.   The synthetic resin buckle according to claim 4 or 5, wherein the ceiling frame and the operation plate are connected by a connecting shaft connecting the two middle points.

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