JP2000135103A - Synthetic resin buckle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate production and to reduce weight. SOLUTION: At the time of moving a band into an insertion space 16 from an insertion port 15 on the side of a pressurizing part 22, the upper surface of the band is brought into contact with the engaging pawl 21 of an operation plate 20 and advances while pushing up one end part of the plate 20 to adjust the relative position of the band with respect to the buckle 10. Since the pawl 21 is fit-engaged with a prescribed engaging groove, the band can freely be moved out to the buckle 10 but can not be moved back. In order to move back or pull out the band from the buckle 10 on the other hand, the part 22 of the plate 20 is pushed down with a finger. Thus, the pawl 21 positioned on the opposite side is lifted up and the pawl 21 is detached from the engaging groove to freely slide the band.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buckle for locking a band or a belt having an engaging groove.
In particular, it relates to a buckle for use with a helmet headband, watch band, bag or shoe band or belt.

[0002]

2. Description of the Related Art Conventionally, a band (or belt) is provided with an engagement groove, and a hook of a buckle is elastically engaged with the groove.
A buckle that can release the locked state at any time is known. FIG. 7 is a perspective view of a representative buckle of this type, in which a buckle body 1 is formed in a substantially U-shaped cross section by a bottom plate 2 and both side plates 3, 3, and a shaft 4 is provided between the side plates 3, 3. , The lid 5 is attached to the shaft 4, one end 5A of the lid 5 is urged in the direction of the bottom plate 2 by the coil spring 6, and the other end 5B is used as a pushing operation portion. An attachment hole 7 and the like are provided to attach to a bag body, shoes, various bands, and the like.

On the other hand, the belt forming a pair with the buckle is provided with engagement grooves having a sawtooth cross section in the longitudinal direction thereof, and the belt is inserted into a gap formed between the buckle body 1 and the cover piece 5. It is designed to be inserted. In the above-mentioned 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 belt insertion is stopped at an arbitrary tightening position, one end 5A of the lid piece 5 engages with the belt. The movement in the pull-out direction is restricted by being locked in the mating groove. To remove the belt, the other end 5B of the cover piece 5 is pushed down toward the buckle main body 1 so that the other end 5B rises from the engagement groove of the belt and is disengaged.

The above-mentioned conventional buckle has a drawback that the number of constituent parts is large, so that the assembling work is complicated, and since it is made of metal, it is heavy and is not suitable for a buckle which needs to be reduced in weight. I have. Further, since the mechanism for releasing the engagement with the belt by the pressing force from above 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]

SUMMARY OF THE INVENTION An object of the present invention is to provide a buckle made of a synthetic resin which is easy to manufacture and lightweight, and is particularly suitable for a buckle for a headband of a helmet. The buckle is provided.

[0006]

A synthetic resin buckle according to the present invention comprises a bottom plate, a ceiling frame, and both side plates for connecting the both, which are opposed to each other, and the inside of the buckle is a band insertion space for a band having an engagement groove. A main body, and an operation plate horizontally installed inside the ceiling frame, having an engagement claw on the lower surface of one end portion capable of engaging with the engagement groove of the band, and having an upper surface of the other end portion as a pressing portion. The operation plate is connected to two sides of the opposing ceiling frame at an intermediate point between the engaging claw and the pressing portion, so that the operation plate can swing about the intermediate point as a fulcrum. It is.

It is desirable that the synthetic resin buckle is integrally molded. It is preferable that the ceiling frame and the operation plate are connected by a connection shaft connecting the two intermediate points. It is preferable that the vicinity of one end of the operation plate be connected to at least one side of the facing ceiling frame. It is preferable that a pair of hooking projections is provided on the outer surface of the band and the ceiling frame so that the band can be pulled by the fingertip of the hand on the buckle body.

[0008]

When the band is inserted into the insertion space of the buckle body from one of the insertion openings, 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. Is adjusted relative to the band.
In this state, since the engaging claw is engaged with the predetermined engaging groove and locked, the band can freely advance with respect to the buckle, but cannot retract. On the other hand, in order to retract or pull out the band from the buckle, if the pressing portion of the operation plate is pressed down, the engaging claw located on the opposite side rises and the engagement with the engaging groove is released, The band can slide freely.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a synthetic resin buckle according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a buckle 10, and FIG.
FIG. 2A is a plan view thereof, and FIG. 2B is a longitudinal sectional side view thereof. In these figures, the buckle 10 is
1, a flat and tubular buckle body 14 composed of a ceiling frame 12 opposed thereto and side plates 13 and 13 connecting the bottom plate 11 and the ceiling frame 12 constitutes a main body. The buckle main body 14 has the insertion direction of the band 15, 1
5, and the inside thereof is an insertion space 16 for a band 30 having an engagement groove to be described later. In the present embodiment, by making the length of the bottom plate 11 in the longitudinal direction (the sliding direction of the band) longer than the length of the ceiling frame 12 in the longitudinal direction,
In the mounting holes 17 and 17 formed in the bottom plate 11, the buckle 10 (not shown) can be easily mounted on a connected object (ie, a helmet headband, a bag band, or the like), and the band can be smoothly inserted. To be done.

Inside the ceiling frame 12, an operation plate 20 large enough to fit therein is installed horizontally. An engagement claw 21 that can be engaged with the engagement groove of the band 30 is protruded from the lower surface of one end of the operation plate 20, and the upper surface of the other end is a pressing portion 22. Preferably, it is concave. By setting the operation plate 20 slightly lower than the ceiling frame 12,
It is possible to reliably prevent the pressing portion 22 from being pressed down carelessly.

A connecting shaft 25 is formed at an intermediate portion of the operation plate 20 in the longitudinal direction.
2 are respectively connected to two sides. In this embodiment, the cross-section of the connecting shaft 25 is elliptical, but may be circular or various other cross-sectional shapes. The connection shaft 25 pivotally supports the operation plate 20 and may be any shape as long as it is not damaged by repeated swings. The connection shaft 25 is not limited to the ceiling frame 12 and can exert the same operation as that described later even if it is supported by the upper inner wall of each side plate 13.

The buckle 10 can be molded from a flexible synthetic resin. In particular, since the operation plate 20 needs to be swung around the connection shaft 25, the buckle 10 is made of polyacetal, polyoxymethylene, polyamide, polycarbonate, or the like. It is preferable to mold with a synthetic resin having elasticity. The buckle 10 of the present invention is composed of a small number of parts and has a simple structure, so that it can be easily molded integrally with a mold. In addition, the buckle 10 and the band 30 can be integrally formed.

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 engaging claw 21 of the buckle 10 is engaged with the engaging groove 31 formed on the outer surface of the band 30. ing. The engaging 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 almost vertically from the deepest position. Note that reference numeral 3
Reference numeral 5B denotes a locking projection provided on the band 30, which will be described later.

When the band 30 is inserted into the insertion space 16 from the insertion port 15 on the pressing portion 22 side (the right side in FIG. 3), the upper surface of the band 30 comes into contact with the engaging claw 21 of the operation plate 20, The operation plate 20 advances while pushing up one end (the side where the engagement 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, since the engagement claws 21 are engaged with the predetermined engagement grooves 31 and locked, the band 30 can advance with respect to the buckle 10, but is retracted. It is impossible.

On the other hand, in order to retreat or pull out the band 30 from the buckle 10, the pressing portion 22 of the operation plate 20 is lightly pressed down with a finger, and as shown in FIG. As a result of the rotation of the operation plate 20 about the center, 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 slid freely. 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.

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. 1 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the operation plate 20 is positioned at the position of the connection shaft 25 described above.
The upper edge of the ceiling frame 12 and the upper portion of the ceiling frame 12 are connected by connecting pieces 27, 27, and the operation plate 20 can be swung about the connecting pieces 27, 27 as pivots. Note that reference numeral 28 is
In order to ensure the swing of the operation plate 20, the connecting pieces 27, 27
Above is a cutout groove formed in the axial direction of the swing.

In this embodiment, one end of the operation plate 20 (the side on which the engagement claws 21 are provided) is connected to the opposing ceiling frame 12. The connection is made by bent connecting members 33, 33 extending from the corners of the operation plate 20, and when the finger is released from the pressing portion 22 after the pressing portion 22 is pressed down, the operation plate 20 is restored to the original horizontal position. It is easy to restore to the state. Therefore, as the shape of the connecting member 33, various other members such as a corrugated plate can be applied. In other words, the connecting member 33 has a function as a damper for the swinging operation of the operation plate 20. The operation plate 20 and the ceiling frame 12 are connected to the connection shaft 25 (or the connection piece 2).
The side edge of the operation plate 20 other than the one end may be connected to the ceiling frame 12 on the opposite side of the pressing portion 22 across 7). At this time, as shown in FIG.
It is desirable to provide a stopper 40 at the one end of the operation plate 20 to prevent the one end from being pushed up more than necessary by contacting the end. 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.

Next, a modified embodiment of the buckle 10 shown in FIG. 2 will be described with reference to FIG. In the present embodiment, first, a hooking projection 35A is provided on the ceiling frame 12 to protrude upward. The hooking projection 35A is provided with a fingertip on both the hooking projection 35B provided on the outer surface of the band 30 shown in FIG.
It can be pulled with one hand. Therefore, the hooking projections 35A and 35B may be of any shape as long as the hooking projections 35A and 35B have such a size and shape that they can be hung on a fingertip.

At the center of the upper surface of the operation plate 20, an operation plate 20
Is provided in the longitudinal direction to ensure the swinging operation. The rib 36 is not only at the center of the upper surface,
It may be provided in the longitudinal direction along the upper edge of the operation plate 20, or may be formed on the back surface (lower surface) of the operation plate 20.

In the insertion space 16 of the buckle body 14, a stopper 37 for preventing the other end of the operation plate 20 (the side provided with the pressing portion 22) from being pressed down more than necessary.
Is installed. In the present embodiment, the stopper 37 is provided below the other end of the operation plate 20 so as to protrude horizontally from the side plates 13, 13.

Furthermore, the band 30 is lifted up in the insertion space 16 so that when the lock between the engaging claw 21 and the engaging groove 31 is released, the engaging groove 31 of the band 30 is lifted and the lock cannot be released. Band retainer 3 to prevent
8, 38 are provided. In the present embodiment, the band retainer 38 is provided immediately below the engagement claw 21 and horizontally projecting from the side plates 13, 13.

[0023]

The buckle according to the first aspect has a small number of components and is made of synthetic resin, so that it is lightweight and the manufacturing cost is low. In addition, since the structure for directly operating the engagement claw is employed, the engagement release operation is also reliable,
Further, since the operation plate is surrounded by the ceiling frame, there is no possibility of careless or sudden lock release. further,
Since the operation plate is installed parallel to the bottom plate, it has a very flat shape and a compact structure. In particular, when this buckle is applied to a headband for a helmet, the excellent effect that the band size can be easily adjusted while worn by a simple disengagement operation even when the buckle is deployed on the back of the head. It is suitable as a buckle for a headband for a helmet worn for protection of the head during construction work, civil engineering work, other various works, vehicle driving or athletic competition.

In the buckle according to the second aspect, since the structure of the molding die is simple, the cost of the die is low, and the buckle can be easily manufactured. Since the buckle according to the third aspect of the present invention has the connecting shaft, the operation plate installed in a horizontal state can be surely swung, and the structure is robust enough to withstand repetitive swing operations. Can be.

In the buckle according to the fourth aspect, the swinging operation plate has a high restoring force, so that a more reliable engagement / disengagement operation can be ensured and reliability can be improved. According to the buckle of the fifth aspect, the slide adjustment of the band can be performed with only one fingertip, and the engaging operation can be performed quickly and easily.

[Brief description of the drawings]

FIG. 1 is a perspective view of a buckle.

FIG. 2 (a) is a plan view of the buckle shown in FIG. 1,
FIG. 2B is a longitudinal sectional side view.

FIG. 3 is a vertical sectional 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 sectional side view showing another embodiment of the buckle.

FIG. 6 is a plan view (FIG. 6A) and a longitudinal side view (FIG. 6B) showing a modified embodiment of the buckle shown in FIG. 2;

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 Pressing part 25 Connection shaft 27 Connection piece 30 Band 31 Engagement groove 33 Connection member 35A, B Hook projection

Claims (5)

[Claims] 1. A buckle body comprising a bottom plate and a ceiling frame facing each other and both side plates connecting the both, the inside being a space for inserting a band having an engagement groove, and a buckle body horizontally installed inside the ceiling frame; An operating plate having an engaging claw that can be engaged with the engaging groove of the band on the lower surface at one end, and an operating plate having the upper surface at the other end as a pressing portion, wherein the operating plate is provided with the engaging claw and the pressing portion A buckle made of synthetic resin, which is connected to two sides of the opposing ceiling frame at an intermediate point, so as to be swingable about the intermediate point. 2. The synthetic resin buckle according to claim 1, which is integrally molded. 3. The synthetic resin buckle according to claim 1, wherein the ceiling frame and the operation plate are connected by a connection shaft connecting the two intermediate points. 4. The synthetic resin buckle according to claim 1, wherein the vicinity of one end of the operation plate and at least one side of the facing ceiling frame are connected. 5. The buckle body is provided on the outer surface of the band and on the ceiling frame with a pair of latching projections that allow the band to be pulled by a fingertip of one hand.
A buckle made of the synthetic resin described.