JPH0334092Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a buckle device used in a seat belt device that restrains and protects an occupant when a vehicle suddenly decelerates.

[Prior art]

In a buckle device used in a seat belt device, a tongue plate attached to the end or middle part of the webbing for restraining an occupant is engaged with a lock plate, thereby allowing the occupant to put on the webbing. .

By the way, in the conventional buckle device, as shown in Japanese Patent Application Laid-Open No. 59-135008, the center of swing of the lock plate that engages with the tongue plate is located at a position where the claw portion of the lock plate is closer to the engagement portion where the tongue plate engages with the lock plate. is also located at a position spaced apart from the substrate portion of the buckle body.

Therefore, when a high load is applied to the tongue plate in the direction of extracting the buckle body through the webbing when the vehicle suddenly decelerates, a rotational force is applied to the lock plate in the direction of separating it from the substrate part of the buckle body around the rocking center.

As a result, there is a risk that the lock plate will swing away from the tongue plate.

[Problem that the invention attempts to solve]

The present invention takes the above-mentioned facts into account, and aims to provide a buckle device in which the strength of engagement between the tongue plate and the lock plate increases when the vehicle suddenly decelerates.

[Means for solving problems and their effects]

The present invention includes a buckle body 22 and a tongue plate 96 inserted into the buckle body 22.
and a lock plate 4 having a hinge portion 54 swingably attached to the buckle body 22.
8, a claw portion 52 provided on the lock plate 48 and inserted into the opening 98 of the tongue plate 96 to prevent the tongue plate 96 from being pulled out from the buckle body 22; 48 to move the claw portion 52 into the opening 98 of the tongue plate 96.
The buckle device 20 has a release button 78 that is pulled out from the buckle body 22, and the lock plate claw 52 inserted into the opening 98 of the tongue plate 96 and the tongue plate opening 98 contact and engage with each other. The hinge portion 54 is inserted into the opening 28 of the buckle body 22, so that the pivoting center of the hinge portion 54 is located on the buckle body substrate portion 34, and thereby the lock plate 48 When a high load is applied from the tongue plate 96 in the direction of extracting the buckle body, the claw portion 52 swings in the direction of approaching the substrate portion 34 of the buckle body around the swing center, and the claw portion 52 further moves toward the tongue plate 96. It swings in the direction of insertion, and has a notch 50 in the middle part of the lock plate 48 at a position between the claw part 52 and the swing center part.
A is formed, and as a result, when the claw portion 52 is inserted into the tongue plate opening 98, the lock plate 48 receives a high load in the direction of extracting the buckle body, and the lock plate 48 is elastically deformed.
The claw portion 52 has two positions sandwiching the tongue plate 96 in the thickness direction, and these two positions are located on the buckle body 2.
The tongue plate 96 is supported on both sides by the tip of the claw that engages with the first engagement receiving portion 36 of the buckle body 22 and the base 58 of the claw that engages with the second engagement receiving portion 42B of the buckle body 22. It is said that

Therefore, under normal conditions (low load), such as when a non-vehicle suddenly decelerates, the claw of the lock plate is inserted into the opening formed in the tongue plate, and the tongue plate and lock plate engage with each other. has been done.

When a high load is applied to the tongue plate in the direction of pulling out the buckle body, such as when the vehicle suddenly decelerates, the contact area between the tongue plate and the claw of the lock plate is on the substrate of the buckle body, but the contact area of the lock plate is The center of the swing is located at the base of the buckle body. Therefore, the lock plate swings in the direction in which the claw portion approaches the buckle body base plate about the swing center, thereby increasing the engagement strength between the tongue plate and the lock plate.

Moreover, since the lock plate is formed with a notch, when the high load is applied to the tongue plate, the lock plate contacts the buckle body at two positions sandwiching the tongue plate in the vicinity of the engagement with the tongue plate. The tongue plate is supported and elastically deformed so as to support the tongue plate on both sides, thereby further increasing the engagement strength between the tongue plate and the lock plate.

Please note that the numbers assigned to the scope of claims for utility model registration and the corresponding parts above are for convenience of explanation.
The shape is not limited to the shape in the drawings corresponding to this symbol.

〔Example〕

1 to 6 show an embodiment of the buckle buckle device according to the present invention.

As shown in FIG. 1, the main parts of the buckle device 20 are housed in a buckle body 22. As shown in FIG. This buckle body 22 is formed by bending a flat plate material having a predetermined strength. The substrate portion 34 of the buckle body 22 is formed into a flat plate shape, and one end of the substrate portion 34 is a connecting portion 26. This connection portion 26 has an opening 28 as an opening.
is formed, and one end of a strap 32 (see FIG. 4) is connected to this opening 28 via a protector 30. The other end of the strap 32 is configured to be fixed to the vehicle body via an unillustrated anchor plate or the like.

An opening 36 is formed in the substrate portion 34 of the buckle body 22 as an opening. This opening 36
The protrusion 38 is left uncut at the rear center, making it approximately U-shaped. Furthermore, substantially rectangular notches 42 are formed above the intermediate portions of the leg plate portions 40, 40 extending parallel to each other from both sides of the base plate portion 34. Guide flanges 44, 44 are formed adjacent to the notches 42, 42 on the side of the buckle body extraction direction of the leg plates 40, 40 (on the left side in FIGS. 3 to 6), and are bent and protruded in a direction away from each other. has been done. These guide flanges 44, 44
On the lower side of the tongue plate 96 (see Fig. 4)
Projections 45, 45 are projected inward from the leg plates 40, 40 for regulating upward movement and positioning the legs. Further, notches 46, 46 are formed on the leg plate portions 40, 40 on the side in the buckle body insertion direction (the right side in FIGS. 3 to 6).

The lock plate 48 includes the base plate 3 at the center of the central flat plate 50 on the side of the buckle body extraction direction.
The claw portion 52 bends in four directions, and the central flat plate portion 5
The board portion 3 is located on the side of the buckle body insertion direction of 0.
A hinge portion 54 is formed that bends in four directions. The tip of the hinge portion 54 extends longer than the tip of the claw portion 52.

On the side of the buckle body extraction direction of the central flat plate portion 50, there is a substantially rectangular protrusion portion 5 extending to both sides in the width direction.
6,56 are formed. In addition, the central flat plate portion 5
0 is formed with a hollowed out portion 50A as a notch that continues to a part of the hinge portion 54. This hollowed out portion 50A is formed to be wide on the side near the claw portion 52 and narrow on the side near the hinge portion 54. Notches 60, 60 are formed on both sides of the tip of the hinge portion 54.

Furthermore, the front end surfaces of the central flat plate portion 50 located on both sides of the claw portion 52 serve as locking surfaces 58 , 58 . As shown in FIG. 4, the side surface of the claw portion 52 is formed into an arc shape with a radius R centered on the notch 60. As shown in FIG.

The lock plate 48 has a hinge portion 54 connected to the connection portion 2.
6 and the notch 6 formed in the hinge portion 54 as shown in FIG. 3A.
The periphery of the opening 28 of the connecting portion 26 is inserted and locked at 0 and 60, so that it can swing freely relative to the buckle body 22. As a result, as shown in FIG. 4, the engagement portion between the connection portion 26 and the notch 60 of the lock plate 48 is located at the base portion 34 of the buckle body 22, and the swinging center of the lock plate 48 is located at the base portion 34 of the buckle body 22. It is now located in

As shown in FIG. 1, the protector 30 is fitted into the opening 28 after the lock plate 48 is inserted as described above, and also functions to prevent the lock plate 48 from coming off.

Further, the lock plate 48 has protrusions 56 and 5.
A notch 4 formed in the buckle body leg plate portions 40, 40 on the back surface of the buckle body extraction direction side including 6
The bottom surfaces 42A and 42A of 2 and 42 can be brought into contact with each other. The lock plate 48 has a bottom surface 42A,
42A, the tip of the claw portion 52 passes through the opening 98 of the tongue plate 96 and is located within the opening 36 formed in the buckle body substrate portion 34 (see FIG. 4). As a result, the engagement portion between the claw portion 52 of the lock plate 48 and the tongue plate 69 is not connected to the base plate portion 54 but at least to the base plate portion 54.
The lock plate 48 is positioned in the direction of the flat plate central part 50 from the surface of the lock plate 48 on the flat plate central part 50 side. As described above, the side surface of the claw portion 52 is formed in an arc shape with a radius R centered on the notch 60, so that when the claw portion 52 engages with the tongue plate 96, the claw portion 52 closes the opening of the tongue plate 96. It makes surface contact with the inner peripheral surface of 98.

Therefore, when a high load is applied to the tongue plate 96 in the direction of extracting the buckle body, the lock plate 48 moves counterclockwise in FIG. Rotational force acts. Therefore, the engagement strength between the lock plate 48 and the tongue plate 96 is increased.

The other ends of leaf springs 64, 64, one end of which is supported by a holder 62, are secured to the lock plate 48. The lock plate 48 has leaf springs 64,6
4, and a rotational force is applied in the counterclockwise direction in FIG. 4 using the notches 60, 60 formed in the hinge portion 54 as fulcrums.

The holder 62 has notches 46 and 66 formed in the leg plate portions 40 and 40 of the buckle body 22, respectively.
46 and is locked to the buckle body 22. The leaf springs 64, 64 are inserted into and locked in small holes 68, 68 formed in the holder 62.

The ejector 70 has a buckle body 22 at the top.
The guide portion 72 is formed in a flat, substantially rectangular parallelepiped shape that is wider than the opening 36 formed in the base plate portion 34, and is slidably fitted into the opening 36 at the lower rear portion thereof. There is. A spring support portion 74 is formed protrudingly at the rear of the ejector 70.
A compression coil spring 76 is disposed between the spring support portion 74 and the protruding portion 38 of the base plate portion 34, and biases the ejector 70 in the direction of extracting the buckle body (to the left in FIG. 4).

As shown in FIG.
2, 82 (only one is shown in the figure) are formed. The inclined guide portions 82, 82 are connected to the lock plate 48 as shown by the chain lines in FIG.
It is adapted to come into contact with the back surface of the plate via leaf springs 64, 64.

As shown in FIG. 5A, the release button 78 has a guide flange 4 in which rail grooves 84, 84 are formed in the buckle body leg plate parts 40, 40.
4, 44, these guide flanges 44,
44 to the right in Figure 4.

As shown in FIG. 1, a spring support portion 85 is formed on the release button 78, and a compression coil spring 88 is disposed between this spring support portion 85 and a spring support portion 86 formed on the holder 62. It is set up. As a result, the release button 78 is biased in the tongue plate extraction direction (to the left in FIG. 4). Presser arms 89, 89 having hook-shaped tips are formed on both sides of the release button 78, and these presser arms 89, 89 are positioned so as to sandwich the leg plates 40, 40 of the buckle body 22 from both sides. There is.

As shown in FIG. 4, the buckle cover 90 consists of an upper cover 92 and a lower cover 94, and includes the base plate 34 of the buckle body 22 and the leg plate 4.
0 and 40, and is fixed to the buckle body 22.

The tongue plate 96 has a rectangular opening 9 at its tip.
8 is formed, and one end of a webbing (not shown) is attached to the rear end. The other end of the webbing is configured to be fixed to the vehicle body via an anchor plate or the like.

Next, the operation of this embodiment will be explained.

What is shown in FIG. 6 is the state before the tongue plate 96 is inserted into the buckle body 22.
In this state, the ejector 70 is the compression coil spring 7.
6 and is located at the forward limit, and the guide portion 72 is in contact with the end surface of the opening 36 formed in the base plate portion 34. The claw portion 52 of the lock plate 48 is in contact with the upper surface of the ejector 70. The lock plate 48 is biased by leaf springs 64, 64 and is given a rotational force in the counterclockwise direction in FIG.
2 presses the upper surface of the ejector 70. The release button 78 is biased by a compression coil spring 88, but the tip ends of the presser arms 89, 89 are engaged with the protrusions 56, 56 of the lock plate 48, so that the release button 78 does not reach the forward limit. do not have.

The tongue plate 6 is inserted between the base plate 34 and the protrusion 45 of the buckle body 22 in this state from the left side of the drawing.
9 is inserted, the tip of the tongue plate 96 presses the ejector 70 to the right in the drawing. When the ejector 70 moves to the right against the biasing force of the compression coil spring 76, the claw portion 5 of the lock plate 48
The tip of the tongue plate 96 is located below the two tips.

When the tongue plate 96 is further pushed to the left, the claw portion 52 is placed on the opening 98 of the tongue plate 96.
Since the lock plate 48 is biased counterclockwise in FIG. 6, the tip of the claw portion 52 instantly rotates into the opening 98. The lock plate 48 is rotated so that the tip of the claw portion 52 passes through the opening 98 of the tongue plate 96 and is inserted into the opening 36 formed in the base portion 34 of the buckle body 22 (the state shown in FIG. 4).

The front back surface of the lock plate 48 including the protruding portion 56 abuts against the bottom surfaces 42A, 42A of the notches 42, 42 formed in the buckle body leg plate portions 40, 40, and stops rotating. When the lock plate 48 swings, the release button 78 releases the presser arm 8.
9 and 89 are protrusions 56 and 5 of the lock plate 48.
6 is released, it is urged by the compression coil spring 88 and reaches the leftward forward limit.

This state is shown in FIGS. 3 and 4, and in this state, the tongue plate 96 is pressed by the ejector 70 biased by the compression coil spring 76, so there is no play between it and the lock plate 48. It will not cause any irritation.

Further, the lock plate 48 is connected to the leaf springs 64, 64.
As a result, the tongue plate 96 is pressed against the buckle body 22 while being applied with a rotational force in the counterclockwise direction in FIG.
There is no risk that the engagement with the handle will be released without the operator performing a dissociation operation. Further, the tips of the presser arms 89, 89 of the release button 78 are attached to the lock plate 4.
Since the lock plate 48 is located above the protrusions 56, 56 of the lock plate 8, rotation in the clockwise direction is restricted.

The above lock plate 48 and tongue plate 96
In the engaged state with the webbing, if the vehicle suddenly decelerates, a large tension is applied to the webbing. Then, a high load acts on the tongue plate 96 through the webbing in the direction of extracting the buckle body. Therefore, as shown in FIG. 4, in the lock plate 48, the engaging part between the notch 60 of the hinge part 54, which is the center of swing, and the connecting part 26 of the buckle body 22 is located in the base plate part 34; 48 and the tongue plate 96 are located on the base plate 34, a rotational force acts on the lock plate 48 in the counterclockwise direction in FIG. Therefore, the engagement strength between the lock plate 48 and the tongue plate 96 is increased.

Further, since a large hollowed out portion 50A is formed from the central flat plate portion 50 of the lock plate 48 to the hinge portion 54, the lock plate 48 is elastically deformed. Therefore, the tip of the claw portion 52 comes into contact with the end surface of the opening 36 formed in the base plate portion 34, and locking surfaces 58, 58 located at the base of the claw portion 52 are formed on the buckle body leg plate portions 40, 40. Notch 42,4
Abuts against side surfaces 42B, 42B of No. 2.

Therefore, in this state, the lock plate 48 is supported in contact with the buckle body 22 at two positions sandwiching the tongue plate 96 in the vicinity of the engagement portion with the tongue plate 96, and supports the tongue plate 96 on both sides. The support strength of the lock plate 48 with respect to the lock plate 96 is further increased.

Note that when a large tension is applied to the webbing, not only the claw portion 52 but the entire lock plate 48 is deformed, so that the amount of deformation of each unit portion is small and plastic deformation is prevented. Also, among the hollow parts 50A from the central flat plate part 50 of the lock plate 48 to the hinge part 54, the hollow part 5 near the hinge part 54 is particularly
The portion 0A has an advantageous effect on the elastic deformation of the lock plate 48.

When disengaging the engagement between the buckle device 20 and the tongue plate 96, press the operating section 80 from the state shown in FIGS. 3 and 4 and press the release button 78 against the urging force of the compression coil spring 88. When moving to the right, the inclined interior portions 82, 82 of the release button 78 move toward the leaf spring 6 located on the back surface of the lock plate 48.
4 and 64. The movement of the release button 78 causes the tips of the presser arms 89, 89 to move from above the protrusions 56, 56 of the lock plate 48, and at the same time the lock plate 48
2, 82, the lock plate 48 is moved upwardly along the buckle body 22 of the hinge portion 54.
It oscillates clockwise in FIG. 4 about the abutting part with the axis.

At the same time as the lock plate 48 swings and the tip of the claw portion 52 leaves the opening 98 of the tongue plate 96, the ejector 70 is urged by the compression coil spring 76 and instantly moves to the left, buckling the tongue plate 96. It is thrown out of the device 20. This state is shown in FIG.

When the lock plate 48 and the tongue plate 96 are disengaged and the release button 78 is released, the release button 78 is urged by the compression coil spring 76 and moves to the left in FIG.
Return to the state shown in the figure.

Note that when pressing the release button 50,
Since the inclined guide portion 82 produces a wedge effect (principle of slope) on the lock plate 48, the pressing force of the release button 78 is increased. Therefore, a large clockwise rotational moment about the contact portion of the hinge portion 54 with the buckle body 22 acts on the lock plate 48, so that the tongue plate 96 may be disengaged in a high load state where a large tension is applied to the webbing. The force required for this is relatively small. Further, since the inclined guide portion 82 presses into contact with the curved bent portion of the leaf spring 64, there is little frictional resistance and the disassociation force is reduced.

Further, when a large tension is not applied to the webbing, the claw portion 52 and the locking surfaces 58, 58 of the lock plate 48 are not in contact with the buckle body 22, and a gap is formed between the lock plate 48 and the buckle body 22. . Therefore, since the lock plate 48 is pivotally supported by the base plate 34 of the buckle body 22, the frictional force is small and the force required for disassociation is small.

Further, since the claw portion 52 of the lock plate 48 is curved to match the rotation locus of the claw portion, the disassociation force is reduced.

In this way, in this embodiment, the lock plate 48
A claw portion 52 and a locking surface are provided at the top of the tongue plate 96, and when the load is high, these are brought into contact with and supported by the buckle body 22 to support the tongue plate 96 on both sides, so that the support strength is high. Further, when the load is low, the lock plate 48 supports the tongue plate 96 in a cantilevered manner, so that the releasing force is small.

Note that since the release button 78 is provided with an inclined guide portion so as to come into contact with the lock plate 48, the force required to engage and disengage the tongue plate 96 is reduced due to the wedge effect.

Furthermore, since the release button 78 is provided with a presser arm so as to face the protrusion of the lock plate 48, accidental release is prevented even if an impact force is applied in the release direction.

Note that when a high load is applied in the buckle body extraction direction, the engagement portion between the claw portion 52 and the buckle body 22 is not limited to the opening 36, the locking surface 58, and the side surface 42B shown in the above embodiment, but the claw Any two positions on the buckle body 22, one on the opposite sides of the engagement part of the claw part 52 with the tongue plate 96, may be used.

[Effect of idea]

As explained above, in the buckle device according to the present invention, when a high load is applied to the tongue plate in the direction of extracting the buckle body, the lock plate swings around the swing center in the direction of approaching the substrate part of the buckle body, and at the same time Since the lock plate is elastically deformed so as to be supported on both sides, it has the excellent effect of further increasing the engagement strength between the lock plate and the tongue plate.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the buckle device according to the present invention, FIG. 1 is an exploded perspective view of the entire buckle device excluding the cover, FIG. 2 is a perspective view with the release button cut away, and FIG. The figure is a plan view of the buckle device excluding the cover, and Figure 3A is A of Figure 3.
-A sectional view taken along the line A; FIG. 4 is a sectional view of the buckle device in which the tongue plate and lock plate are engaged; FIG. 5 is a sectional view of the buckle device immediately after the tongue plate is released; FIG. 5A is shown in Figure 5.
FIG. 6 is a cross-sectional view taken along the line VA--VA, and is a cross-sectional view of the buckle device in a state where the tongue plate is released. 20...buckle device, 22...buckle body, 28...opening (opening), 34...substrate part,
36... Opening (opening), 48... Lock plate, 50A... Lightening part (notch), 52... Claw part,
54...Hinge part, 78...Release button, 8
2... Inclined guide section, 96... Tongue plate, 9
8...Aperture (opening).

Claims (1)

[Scope of claims for utility model registration] Buckle body 22 and this buckle body 22
a tongue plate 96 that is inserted into the buckle body 22; a lock plate 48 having a hinge portion 54 that is swingably attached to the buckle body 22;
A claw portion 52 is inserted into the opening 98 of the tongue plate 96 to prevent the tongue plate 96 from being pulled out from the buckle body 22. A buckling device 20 having a release button 78 that is pulled out from an opening 98.
A contact engagement portion between the lock plate claw portion 52 inserted into the opening portion 98 of the tongue plate 96 and the tongue plate opening portion 98 is provided on the base portion 34 of the buckle body 22, and the hinge portion 54 is inserted into the opening 28 of the buckle body 22, so that the pivoting center of the hinge part 54 is located on the buckle body base plate part 34, so that the lock plate 48 is subjected to a high load from the tongue plate 96 in the direction of extracting the buckle body. When the lock plate 96 acts, the claw portion 52 swings in the direction of approaching the substrate portion 34 of the buckle body around the swing center portion, and the claw portion 52 further swings in the direction of being inserted into the tongue plate 96. 48 and at a position between the claw part 52 and the swinging center part.
As a result, when the claw portion 52 is inserted into the tongue plate opening 98, the lock plate 48 is elastically deformed by receiving a high load in the direction of extracting the buckle body.
The claw portion 52 has two positions sandwiching the tongue plate 96 in the thickness direction, and these two positions are located on the buckle body 2.
The tongue plate 96 is supported on both sides by the tip of the claw that engages with the first engagement receiving portion 36 of the buckle body 22 and the base 58 of the claw that engages with the second engagement receiving portion 42B of the buckle body 22. A buckle device.