JP2001247011A - Buckle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buckle device capable of surely detecting whether a tongue plate is locked or not over a long period. SOLUTION: A magnetic plate 84 is integrally adhered to a lock pin holder 56 and a magnet 82 is arranged so as to face the magnetic plate 84 along a sliding direction of the lock pin holder 56. On a lower side of the magnet 82, a magnetic resistance element 86 is arranged adjacent to the magnet 82. When an engagement part 38 of the lock plate 28 enters into an engagement hole 38 and the lock pin holder 56 is moved together with a lock pin 62 according to the entering, the magnetic plate 84 is away from the magnet 82. Therefore, the magnetic field of the magnet 82 attracted to the magnetic plate 84 so far is changed in direction and a resistance value of the magnetic resistance element 86 is changed at this time. As a result, whether the tongue 12 is locked or not can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buckle device for use in a vehicle seat belt device in which a tongue plate is inserted and engaged.

[0002]

2. Description of the Related Art As a buckle device which constitutes a part of a seat belt device and holds a webbing attached state to an occupant body by holding a tongue plate provided on a webbing belt, an engaging member such as a lock plate is used. A so-called indirect locking mechanism that locks the tongue plate in a state in which the engagement member is moved away from the engagement hole by a lock member such as a lock pin in a state of being inserted into the engagement hole of the tongue plate. A buckle device is known.

On the other hand, in such a buckle device having an indirect lock mechanism, a buckle device having a detection mechanism for detecting whether or not the tongue plate is locked by inserting the tongue plate into the main body of the device has been considered. .

As such a detecting mechanism, a sliding contact is provided in the tongue plate or in the main body of the apparatus, the sliding contact being moved with the insertion of the tongue plate, and the state of sliding contact with a fixed contact provided in the main body of the apparatus is electrically controlled. It is detected whether the tongue plate has been inserted by detecting the position of the tongue plate. If the tongue plate is inserted to a position where the engagement member can enter the engagement hole, the engagement member enters the engagement hole. I am to judge.

[0005]

However, in the mechanical switch using the above-mentioned fixed contact, the sliding contact and the fixed contact are worn, the vibration when the vehicle is running, and furthermore, the mechanical switch is not used. The resistance value of the electric circuit changes due to the insertion of foreign matter, etc., and the signal when each contact comes into contact does not reach the signal level used for state judgment, or the signal is emitted without conducting. May not be possible.

On the other hand, in the configuration using the mechanical switch, the engagement member is engaged when the tongue plate is inserted to a position where the engagement member can enter the engagement hole as described above. Because it is configured to judge that the tongue plate has been inserted, there is a possibility that it is determined that the tongue plate is locked just by inserting the tongue plate even if the engaging member is not actually in the engagement hole. is there.

An object of the present invention is to provide a buckle device that can reliably detect whether or not a tongue plate has been locked for a long time in consideration of the above fact.

[0008]

According to a first aspect of the present invention, there is provided a buckle device, wherein a tongue plate having an engaging hole is inserted along a direction intersecting an opening direction of the engaging hole. The tongue plate inserted into the device body is provided so as to be movable in an engagement direction that enters the engagement hole, and is urged in a direction opposite to the engagement direction, and
An engagement member that moves in the engagement direction in accordance with the insertion movement of the tongue plate into the apparatus main body, and is urged in a locking direction parallel to the insertion direction of the tongue plate; When the engaging member is inserted into the mating hole, it is movable in a locking direction parallel to the insertion direction of the tongue plate, and when the engaging member is moved in the locking direction, it engages with the engaging member. A lock member for restricting movement of the engagement member in a direction to be disengaged from the engagement hole, a magnet provided in the apparatus main body and forming a magnetic field around the lock member, and any one of the engagement member and the lock member At least one of them, or a magnetic member that is displaced with the movement of any one of them and changes the magnetic field of the magnet, and is disposed in the magnetic field in the device main body and crosses itself. And a, a magnetoresistive element whose electric resistance value is changed by the direction change of the magnetic field.

In the buckle device having the above structure, when the tongue plate is inserted to a predetermined position in the device main body, the engaging member moves in the engaging direction against the urging force in accordance with the insertion movement of the tongue plate, The engaging member enters the engaging hole of the tongue plate. Further, when the engagement member moves in the engagement direction until it enters the engagement hole, the lock member moves in the lock direction parallel to the insertion direction of the tongue plate by the urging force, and engages with the engagement member, The movement of the engaging member in the direction separating from the engaging hole is restricted. That is, in this state, until the engagement between the lock member and the engagement member is released,
Since the engaging member does not separate from the engaging hole, the tongue plate cannot be pulled out of the apparatus main body.

The buckle device includes a magnet and a magnetoresistive element, and a part of a magnetic field formed by the magnet crosses the magnetoresistive element. However, at least one of the lock member and the engagement member is a magnetic member, or a magnetic member that moves in accordance with the movement of one of the lock member and the engagement member is provided. Therefore, when the magnetic member moves toward and away from the magnet with the movement of the lock member in the lock direction or the movement of the engagement member in the engagement direction, the magnetic field formed by the magnet changes. Accordingly, the angle at which the magnetic field crosses the magnetoresistive element changes. As a result, the electric resistance value of the magnetoresistive element changes. By detecting the change in the electric resistance value, it is detected whether the engaging member has entered the engaging hole, that is, whether the tongue plate is locked. Is done.

In other words, in other words, the magnetoresistive element detects a change in the position of the magnetic member accompanying the movement of the engaging member or the lock member as a change in the magnetic field of the magnet. Therefore, unless the engagement member or the lock member moves, the electric resistance value of the magnetoresistive element does not change. As described above, since the buckle device is configured to detect the movement of the engagement member and the lock member, it is possible to reliably detect whether the tongue plate is locked.

Further, as described above, since the structure detects whether the tongue plate is locked by the change in the direction of the magnetic field, the influence of vibration and the like is extremely small. Since the change in the direction of the magnetic field accompanying the movement of the magnetic member does not change, detection can be performed for a long period of time.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <Configuration of First Embodiment> FIG.
The buckle device 10 according to the first embodiment of the present invention
Is shown by a cross-sectional view, and FIG. 3 is an exploded perspective view showing the structure of the buckle device 10.

As shown in FIG. 1, a buckle device 10 is provided.
In the figure, a buckle main body 18 as an apparatus main body is disposed between the upper cover 14 and the lower cover 16. FIG.
As shown in FIG. 2, a pair of leg plate portions 24 are formed on the buckle body 18 on both sides in the width direction of the flat plate portion 22, and are bent.
The tongue plate 12 is inserted between the pair of leg plate portions 24 through an opening 25 formed between the upper cover 14 and the lower cover 16.

As shown in FIG. 1, an ejector 26 and a lock plate 28 as an engaging member are provided between the pair of leg plates 24 of the buckle main body 18.

The ejector 26 is inserted and arranged in a guide hole 30 formed in the flat plate portion 22 of the buckle body 18, and is inserted and removed in the tongue plate insertion direction (arrows A and B in FIGS. 1 and 2).
It is possible to move to. The other end of a coil spring 32 (shown in FIG. 3) whose one end is locked to the buckle body 18 is fitted to the end of the ejector 26 in the tongue plate insertion direction (the direction of arrow A in FIG. 1). The coil spring 32 urges the tongue plate in the direction of pulling out the tongue (in the direction of arrow B in FIGS. 1 and 2).

The tip of the tongue plate 12 is brought into contact with the ejector 26 when the tongue plate 12 is inserted. The tongue plate 12 removes the ejector 26 from the tongue plate withdrawn state shown in FIG. While being moved in the tongue plate insertion direction (the direction of arrow A in FIG. 1), the tongue plate is inserted as shown in FIG.

On the other hand, the lock plate 28 has a longitudinal direction in the tongue plate insertion / extraction direction (directions of arrows A and B in FIGS. 1 and 2), and is in the tongue plate insertion direction (direction of arrow A in FIGS. 1 and 2). A U-shaped portion 34 is formed at an end portion of which is bent downward at a substantially right angle. This U-shaped part 34
The distal end portion is formed as an engaging portion 38 into the engaging hole 36 of the tongue plate 12, and this engaging portion 38 is fitted into the engaging hole 36 of the tongue plate 12 from the distal end as shown in FIG. The tongue plate 12 is to be engaged. An upward rising portion 40 is formed at an end of the lock plate 28 on the side opposite to the U-shaped portion 34 in the tongue plate extracting direction (the direction of the arrow B in FIGS. 1 and 2).

As shown in FIG. 3, the rising portion 40 is widened in the lock plate width direction, and the lock plate 28 is attached to the pair of leg plate portions 24 of the buckle body 18 by the rising portion 4.
0 are supported at both ends in the width direction of the lock plate,
It spans between four. A substantially triangular notch 42 is formed in the leg plate portion 24 at the end in the tongue plate insertion direction (the direction of the arrow A in FIGS. 1 and 2), and the lock plate 28 is inserted into the notch 42 so that the lock plate Both ends in the width direction are inserted, and can swing in the tongue plate engagement disengagement direction (directions of arrows C and D in FIGS. 1 and 2) about the top 42A of the notch 42.

The top portion 42A of the notch 42 is larger than the wall thickness of the rising portion 40 of the lock plate 28, and the lock plate 28 moves slightly in the direction of arrow A or B.

When the lock plate 28 is in the state of being pulled out of the tongue plate, as shown in FIG. 1, the tip of the engaging portion 38 is brought into contact with the upper surface of the ejector 26 and moves in the tongue plate disengaging direction (the direction of arrow C in FIG. 1). It is in a state of being swung.

As shown in FIG. 3, the lock plate 28 has a downwardly bent portion 44 formed at a middle portion in the longitudinal direction between the U-shaped portion 34 and the rising portion 40, and the tongue shown in FIG. When the bent portion 44 is pressed in the tongue plate insertion direction (the direction of the arrow A in FIG. 1) from the plate extraction state, it is swung in the tongue plate engagement direction (the direction of the arrow D in FIG. 1). I have. The bent portion 44 is connected to the ejector 26
1 corresponds to the end of the block 46 provided integrally on the upper surface of the block 46 in the direction of inserting the tongue plate (the direction of arrow A in FIGS. 1 and 2), and the ejector 26 is moved from the tongue plate withdrawn position shown in FIG. When the 12 is inserted, the bent portion 44 is inserted in the tongue plate insertion direction (the direction indicated by the arrow A in FIG. 1).
2, the lock plate 28 is moved in the tongue plate insertion direction as shown in FIG. 2 while swinging the lock plate 28 in the tongue plate engagement direction (the direction of arrow D in FIG. 1). As a result of the rocking movement at this time, the tip of the engaging portion 38 is moved to the tongue plate 1 as shown in FIG.
2 and is engaged with the tongue plate 12.

The lock plate 28 has a rising portion 40
And a spring holder 48 is attached. One ends of two coil springs 50 and 52 (shown in FIG. 3) are fitted to the spring holder 48. The other ends of these two coil springs 50 and 52 (shown in FIG. 3) are closer to the tongue plate withdrawal direction (arrow B direction in FIGS. 1 and 2) than the spring holder 48, and the release button 54 and the lock The release button 54 and the lock pin holder 56 are fitted in the pin holder 56, and are urged by coil springs 50 and 52 in the tongue plate extracting direction (the direction of arrow B in FIGS. 1 and 2).

The release button 54 is connected to the lock pin holder 5
6, the tongue plate extraction direction (arrow B in FIGS. 1 and 2).
Direction) tongue plate insertion / extraction direction (Figs. 1 and 2)
Are provided so as to be movable in the directions of arrows A and B of FIG. 3, and can be moved in the tongue plate insertion direction (the direction of arrows A in FIGS. 1 and 2) against the urging force of the coil spring 50 (shown in FIG. 3). ing. At the end of the release button 54 on the side of the tongue plate insertion direction (the arrow A direction in FIGS. 1 and 2), a block 58 is protruded in the tongue plate insertion direction (the arrow A direction in FIGS. 1 and 2). I have. The block 58 penetrates a rectangular hole 60 (shown in FIG. 3) provided at the upper end of the lock pin holder 56 so as to be movable in the axial direction, and corresponds to the upper end of the rising portion 40 of the lock plate 28.

In the block 58, when the release button 54 is pressed from the tongue plate engagement state shown in FIG. 2 against the urging force of the coil spring 50 (shown in FIG. 3), the tongue plate is inserted in the tongue plate insertion direction (the direction of arrow A in FIG. 2). In the course of this movement, it is brought into contact with the upper end of the rising portion 40 of the lock plate 28, and presses the rising portion 40 of the lock plate 28 to disengage the lock plate 28 in the tongue plate disengaging direction (arrow C in FIG. 2). (Direction) while being moved in the tongue plate insertion direction. Lock plate 28
Is moved from the tongue plate engagement state shown in FIG.
6 to be extracted.

The lock pin holder 56 is urged by a coil spring 52 (shown in FIG. 3). When the tongue plate is engaged, the lock pin holder 56 is provided outside the leg plate 24 of the buckle body 18 as shown in FIG. A lock pin 62 as a lock member is sandwiched between the lock pin 54 and the lock pin 54. The lock pin 62 is supported by the buckle body 18 with both axial ends fitted into bearing holes 64 provided in the leg plate 24 of the buckle body 18. The bearing hole 64 is a long hole that is elongated in the tongue plate insertion / extraction direction (the direction of arrows A and B in FIGS. 1 and 2), and supports the lock pin 62 so as to be movable in the tongue plate insertion / extraction direction. ing.

The lock pin 62 is connected to the lock plate 28
Corresponding to the positioning plate portion 66 provided in the first position. As shown in FIG. 3, the positioning plate portion 66 extends in the lock plate width direction from an intermediate portion substantially perpendicular to the engaging portion 38 of the U-shaped portion 34, and as shown in FIG. The lock pin 62 corresponds to the upper surface, and the lock pin 62 corresponds to the peripheral edge end surface in the tongue plate insertion direction (the direction of arrow A in FIG. 1) as shown in FIG. Has become.

More specifically, when the tongue plate is engaged, the lock pin 62 is sandwiched between the lock pin holder 56 and the release button 54 as shown in FIG. . Lock pin 6
In a state (lock position) where 2 corresponds to the upper surface of the positioning plate 66, the lock plate 28 is prevented from swinging in the tongue plate disengaging direction (the direction of arrow C in FIG. 2) by the lock pin 62. From this tongue plate engagement state, the lock pin 62 is moved in the tongue plate insertion direction (the direction of the arrow A in FIG. 2), and the positioning plate portion 66 is closer to the tongue plate insertion direction than the end surface of the tongue plate insertion direction (release). Lock plate 2 when positioned at
8 can swing in the tongue plate disengaging direction (the direction of arrow C in FIG. 2).

Also, on the bottom 16A of the lower cover 16,
A protruding portion 68 as an engagement assisting means is provided upright, and the tip of the protruding portion 68 is bent at a right angle toward the insertion direction of the tongue plate 12 (the direction of arrow B) to engage the locking claw 68A.
It has been.

On the other hand, a locking hole 70 is formed at the tip of the engaging portion 38 of the lock plate 28. When the lock plate 28 moves in the direction of arrow A due to inertial force or the like, this locking hole is formed. The locking claw 68A of the projecting portion 68 of the lower cover 16 is fitted into and engaged with the stop hole 70.

As shown in FIGS. 1 and 3, the buckle device 10 has a magnet 82. The magnet 82 is arranged so as to face the lock pin holder 56 along the above-described insertion / extraction direction of the tongue plate 12, and has a polarity along the insertion / extraction direction of the tongue plate 12. Further, a magnetic plate 84 as a magnetic member is integrally attached to the lock pin holder 56 so as to face the magnet 82 along the insertion / extraction direction of the tongue plate 12.

Further, a pair of element bodies formed of a ferromagnetic material such as a Ni-Co (nickel-cobalt) alloy are disposed substantially perpendicularly below the magnet 82 so as to be anisotropic. A so-called ferromagnetic magnetoresistive element which detects a change in the direction of a magnetic field line crossing itself using a magnetoresistive hardening or one or a plurality of element bodies formed of a semiconductor such as InSb (indium antimonide). A magnetoresistive element 86 such as a so-called semiconductor magnetoresistive element in which the current path changes (that is, the electric resistance value changes) due to the Lorentz force in accordance with the change in the direction of the magnetic force lines crossing itself.
Is arranged. Since the magnetoresistive element 86 is a well-known technique, a detailed description is omitted here.

A circuit board 88 is provided beside the magnet 82 and the magnetoresistive element 86. Further, the circuit board 88 is connected to a computer (not shown).
The output voltage from the circuit board 88 is detected. Further, the computer is electrically connected to an indicator (not shown) provided on an instrument panel or the like of the vehicle, and turns on the indicator when a predetermined output voltage from the circuit board 88 is detected.

<Operation and Effect of First Embodiment> Next, the operation and effect of this embodiment will be described.

FIG. 1 shows a buckle device 1.
0 is a state where the tongue plate 12 is not engaged. Tongue plate 12 is attached to buckle device 10 in this state.
Is inserted, the tip of the tongue plate 12 abuts against the ejector 26, and the ejector 26 is
2 in the tongue plate insertion direction (the direction of arrow A in FIG. 1). The tongue plate 12 is moved in the tongue plate insertion direction while moving the ejector 26 in the tongue plate insertion direction (the direction of arrow A in FIG. 1).

During this movement, the ejector 26 comes into contact with the bent portion 44 of the lock plate 28 and
8 is pressed in the tongue plate insertion direction (the direction of arrow A in FIG. 1). The ejector 26 is moved in the tongue plate insertion direction (arrow A direction in FIG. 1) while swinging the lock plate 28 in the tongue plate engagement direction (arrow D direction in FIG. 1), and the tongue plate 12 is moved in the tongue plate insertion direction. When the lock plate 2 is
8 engaging portions 38 are fitted.

At this time, the lock pin 62 can be moved in the tongue plate withdrawal direction (the direction of the arrow B in FIG. 1) by swinging of the lock plate 28, and the lock pin holder 56
And is urged by the coil spring 52 to move in the tongue plate extracting direction. Therefore, in a state where the engagement portion 38 of the lock plate 28 is fitted into the engagement hole 36 of the tongue plate 12, the upper surface of the positioning plate portion 66 (lock position) is sandwiched between the lock pin holder 56 and the release button 54. ). This state is the tongue plate engagement state shown in FIG.

Therefore, in the tongue plate engagement state shown in FIG. 2, the tongue plate disengagement direction of the lock plate 28 by the lock pin 62 (the direction of arrow C in FIG. 2).
Of the lock plate 28 is prevented.
Does not fall out of the engagement hole 36 of the tongue plate 12, and the tongue plate 12 does not accidentally come off the buckle device 10.

When an inertia force acts in the direction of arrow A in the tongue plate engagement state shown in FIG. 2, the lock pin 62 is moved in the direction of arrow A (in the direction of the release position) against the urging force of the coil spring 52. ). In this case, since the lock plate 28 is also moved in the direction of arrow A by the inertial force, the locking claw 68A of the protruding portion 68 erected on the lower cover 16 in the locking hole 70 formed in the engaging portion 38 of the lock plate 28. Are fitted and engaged. Therefore, the lock plate 28 is held in the tongue plate engagement state, and the engagement state between the lock plate 28 and the tongue plate 12 is not released by the inertial force.

On the other hand, the lock pin 62 cannot move in the directions of the arrows B, C and D, and cannot move in the axial direction of the lock pin 62. . Therefore, in the buckle device of the present embodiment, even when the inertial force in any direction acts,
The lock plate 28 can be held in the tongue plate engagement state.

When the tongue plate 12 is disengaged from the buckle device 10, the occupant releases the release button 54 from the state shown in FIG. 2 against the urging force of the coil spring 50 in the tongue plate insertion direction (the direction of arrow A in FIG. 2). Moved to The release button 54 holds the lock pin 62 between the lock pin 62 and the lock pin holder 56.
The lock pin holder 56 is moved in the tongue plate insertion direction (the direction of arrow A in FIG. 2) while being moved against the urging force of the coil spring 52 (shown in FIG. 3).

By this movement, the lock pin 62 is positioned closer to the tongue plate insertion direction (the direction of the arrow A in FIG. 2) than the positioning plate portion 66 of the lock plate 28, and then the block 58 of the release button 54 is set up on the lock plate 28. The release button 54 is pressed against the upper end 40 of the lock plate 28 in the tongue plate insertion direction to swing the lock plate 28 in the tongue plate disengagement direction (arrow C direction in FIG. 2). It is further moved in the tongue plate insertion direction.

The rocking plate 28 swings at this time so that the engaging portion 38 comes out of the engaging hole 36 of the tongue plate 12. At the same time, the ejector 26 is urged by the coil spring 32 to move in the tongue plate withdrawing direction (the direction of the arrow B in FIG. 2), and is pressed by the ejector 26 so that the tongue plate 12 is ejected outward from the buckle device 10. The operation returns to the state shown in FIG.

Here, the lock plate 28 swings until the engagement portion 38 is fitted into the engagement hole 36, so that the lock pin 62 moves to the position where the lock plate 28 can be prevented from swinging. When the lock pin holder 56 slides, the magnetic plate 84 attached to the lock pin holder 56 slides and moves away from the magnet 82. When the magnetic plate 84 is separated from the magnet 82, the magnetic lines of force that constitute the magnetic field that has been attracted to the magnetic plate 84 up to that point, in particular, the magnetic lines of force that cross the magnetoresistive element 86 change their directions. The changing electric resistance value of the magnetoresistive element 86 changes.

As described above, the magnetoresistive element 86 whose electric resistance value changes can be regarded as a kind of variable resistance element. For this reason, in the circuit board 88, the magnetoresistive element 86
Is detected as, for example, a change in the output voltage, and the computer detects from the change in the output voltage that the lock pin holder 56 has moved, that is, that the engagement portion 38 has been fitted into the engagement hole 36. And the indicator is turned on. Thereby, the occupant can recognize that the tongue plate 12 is locked.

As described above, in this embodiment, the engaging portion 3
The movement of the lock pin holder 56, which does not basically move until the lock pin 8 is
Is detected by the magnetoresistive element 86 in the form of a change in the direction of the magnetic field, so that it is possible to reliably detect whether or not the tongue plate 12 is locked.

As described above, since it is detected whether or not the tongue plate 12 is locked by the change in the direction of the magnetic field, the influence of vibration or the like is extremely small. Since the change in the direction of the magnetic field accompanying the movement of the plate 84 does not change, detection can be performed for a long period of time.

Next, another embodiment of the present invention will be described. In the following description of the other embodiments, the same reference numerals are used for parts that are basically the same as the first embodiment and the above-described embodiment. The description is omitted here.

<Second Embodiment> FIG. 4 is a sectional view showing the structure of a buckle device 100 according to a second embodiment of the present invention, and FIG.
0 is shown by an exploded perspective view. As shown in these drawings, in the buckle device 100, the magnetic plate 84 is not provided on the lock pin holder 56. The buckle device 100 includes a coil spring 102 instead of the coil spring 50.
The coil spring 102 is basically the same as the coil spring 50.
02 is made of a magnetic material.

That is, in this embodiment, the coil spring 102 is a magnetic member, and the direction of the magnetic field (lines of magnetic force) of the magnet 82 when the coil spring 102 expands and contracts due to the movement of the lock pin holder 56 is detected. It is.

More specifically, as shown in FIG. 5, when the coil spring 102 is compressed, substantially all of the coil spring 102 is
When the lock pin holder 56 moves and the coil spring 102 extends, a part or most of the coil spring 102 is separated from the magnet 82. Compared to a case where the coil spring 102 is in a compressed state and almost all of the coil spring 102 is located near the magnet 82,
Is extended and a part or a large part thereof is separated from the magnet 82, the coil spring 102 does not attract the line of magnetic force, and the magnetic field of the magnet 82 changes its direction.

As described above, also in the present embodiment, the change in the direction of the magnetic field of the magnet 82 due to the movement of a part of the coil spring 102 due to the movement of the lock pin 62 is detected by the magnetoresistive element 86, whereby the first The same effect as that of the embodiment can be obtained.

<Third Embodiment> FIG. 6 is a sectional view showing the configuration of a buckle device 120 according to a third embodiment of the present invention, and FIG.
Is shown in an exploded perspective view.

As shown in these figures, in the buckle device 120, the magnet 82, the magnetoresistive element 86, and the circuit board 88 are arranged on the lock pin holder 56 and between the pair of rectangular holes 60. The buckle device 120 includes a lock plate 122. The lock plate 122 is basically the same as the lock plate 28 in the first and second embodiments, but the entire lock plate 122 or at least the U-shaped portion 34.
Is formed of a magnetic material, and serves as an engaging member and also serves as a magnetic member.

That is, in the present embodiment, the engagement portion 38
Is inserted into the engagement hole 36, the U-shaped portion 34 moves downward. As a result, the U-shaped portion 34 is separated from the magnet 82 on the lock pin holder 56, and the magnet 82 previously attracted to the U-shaped portion 34
Lines of the magnetic field formed by the magnetic field, particularly the magnetoresistive element 8
Lines of magnetic force crossing 6 change their direction. At this time, it is possible to detect that the engagement portion 38 has been fitted into the engagement hole 36 by the change in the electric resistance value of the magnetoresistive element 86 accompanying the change in the direction of the magnetic force line.

Here, in the first and second embodiments, the lock pin holder 56 and the coil spring 102
In the present embodiment, the movement of the lock plate 122 is directly detected, whereas the movement of the lock plate 28 is indirectly detected from the movement of the lock plate. However, although there is a difference between direct and indirect, the basic configuration is the same as that of the previous embodiment, so that the same operation as that of the previous embodiment can be achieved and the same effect can be obtained. .

[0057]

As described above, the buckle device of the present invention can reliably detect whether or not the tongue plate has been locked for a long period of time.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a tongue plate withdrawn from a buckle device according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a tongue plate engaging state of the buckle device according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of the buckle device according to the first embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a tongue plate withdrawn from a buckle device according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view of a buckle device according to a second embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view showing a state where a tongue plate is removed from a buckle device according to a third embodiment of the present invention.

FIG. 7 is an exploded perspective view of a buckle device according to a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 buckle device 12 tongue plate 18 buckle main body (device main body) 28 lock plate (engagement member) 36 engagement hole 62 lock pin (lock member) 82 magnet 84 magnetic plate (magnetic member) 86 magnetic resistance element 100 buckle device 102 coil Spring (magnetic member) 120 Buckle device 122 Lock plate (engaging member, magnetic member)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masahiro Taniguchi 3-260 Toyota, Oguchi-machi, Niwa-gun, Aichi Prefecture F-term in Tokai Rika Electric Works, Ltd. (Reference) 3B090 BC05 BC28 BD01 3D018 BA12

Claims (1)

[Claims] 1. An apparatus body in which a tongue plate having an engagement hole is inserted along a direction intersecting an opening direction of the engagement hole, and the engagement of the tongue plate inserted in the apparatus body. A member provided so as to be movable in an engaging direction into the hole, urged in a direction opposite to the engaging direction, and moved in the engaging direction in response to the insertion movement of the tongue plate into the apparatus main body. A mating member, while being urged in a locking direction parallel to the insertion direction of the tongue plate, and parallel to the insertion direction of the tongue plate in a state where the engagement member enters the engagement hole. A lock member that is movable in the lock direction, and that, when moved in the lock direction, engages with the engagement member and restricts the movement of the engagement member in a direction away from the engagement hole. , Previous A magnet provided in the main body of the device and forming a magnetic field around the magnet; at least a part of one of the engaging member and the locking member; A buckle device comprising: a magnetic member that changes a magnetic field of the device; and a magnetoresistive element that is arranged in the magnetic field in the device main body and that changes an electrical resistance value according to a change in the direction of the magnetic field that crosses the magnetic member.