JP2001046118A - Buckle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buckle device capable of reliably preventing a tongue plate from being released from a buckle body due to the action of a pretensioner and capable of simplifying a structure for realizing it. SOLUTION: This buckle device is provided with a lock lever 60 rotatable ranging over a lock position where a hook member 20 is locked unreleasably and a non-lock position where the hook member 20 is releasable and invariably excited to the non-lock position side by a torsion spring. The lock lever 60 is pivotally supported on a frame 2 via a pivotal shaft 64 eccentric to its center of gravity G. When a pretensioner is operated, the lock lever 60 is rotated to the lock position by inertial force immediately after a buckle body 5 starts moving. When the buckle body 5 is abruptly stopped, the lock lever 30 is moved to the second position by inertial force, thus suppressing the rotation of the lock lever 60 from the lock position to the non-lock position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buckle device having a buckle body and a tongue plate, and in particular, does not separate from the buckle body when the pretensioner moves the buckle body in the webbing tightening direction in a vehicle emergency. And a buckle device.

[0002]

2. Description of the Related Art Conventionally, seat belt devices for vehicles include:
A buckle device is provided for fixing the webbing worn by the occupant to the vehicle body. The buckle device described in Japanese Utility Model Laid-Open Publication No. Hei 6-66311 has a basic configuration in which a buckle body, which is swingably supported by the buckle body, can be switched between an engaged state and a non-engaged state with respect to a tongue plate. A hook member, a lock pin supported by the buckle body and movable between a first position for holding the hook member in an engaged state and a second position for releasing the engaged state, and biased in a tongue plate withdrawing direction by a coil spring. A release button is provided.

Further, in the buckle device disclosed in this publication, the lock lever is rotated near the lock pin in case that the buckle body is retracted to the tightening side by a pretensioner in order to tighten the webbing in the event of a vehicle emergency. It is freely pivoted. When the tongue plate is inserted, the lock lever is rotationally urged to the lock position by the rotational urging member to move and hold the lock pin to the first position, and when the tongue plate is removed, the lock lever is forcibly moved to the unlock position. The lock pin is rotated to allow the lock pin to move to the second position.

In addition, a plate-like inertial body is supported near the lock lever so as to be movable in the direction of approaching / separating from the lock lever and constantly urged by a spring member in the direction away from the lock lever. Is provided.

When the buckle body is suddenly stopped after the buckle body is retracted to the webbing tightening side by a pretensioner that operates in an emergency of the vehicle, the inertial body receives inertia force on the lock lever side and moves against the urging force of the spring member, The rotation of the lock lever to the unlocked position is suppressed by contacting the lock lever. That is, the lock pin rotates the lock lever to the unlocked position, thereby preventing the hook member from being disengaged and the tongue plate from being detached from the buckle main body.

[0006]

[Problems to be Solved by the Invention]
In the buckle device described in Japanese Patent Publication No. 1-2003, a lock lever and an inertia body are provided, and when the buckle body is retracted by a pretensioner and suddenly stops in an emergency of the vehicle, the inertia body receives the inertial force and moves to the lock lever side. The lock pin is kept in contact with the lock lever to prevent the lock lever from rotating to the unlocked position, and the lock pin is held at the first position. Acts, and the lock pin is directly received by the lock lever, so that a strong load is applied to the lock lever from the lock pin.

Therefore, there is a possibility that the lock pin, the lock lever, and the like may be damaged or deformed, and the lock pin may move to the second position and malfunction. In order to reliably prevent this, it is necessary to use an expensive lock pin, lock lever, or the like having high rigidity, which is disadvantageous in terms of manufacturing cost.

Further, in order to prevent the tongue plate from being detached from the buckle main body by the operation of the pretensioner, a lock lever, an inertial body, and an urging member for urging these members must be provided. The number increases, the structure becomes complicated, and the assembly of the buckle device becomes complicated, which is disadvantageous in terms of manufacturing cost. When the tongue plate is inserted, the lock lever pushes the lock pin to the first position. However, since the inclined portion of the rotating lock lever contacts the lock pin and transmits the force, the tongue plate insertion operation can be smoothly performed. There is also a possibility that it cannot be realized.

When the buckle body stops suddenly, the inertial body moves toward the lock lever. However, all the inertial force acting on the lock pin acts as a force for moving the lock pin to the second position. There is a risk of moving to the unlocked position at a very high speed. In the structure of the buckle device, if the lock lever moves from the locked position to the unlocked position even if the inertial body moves to the lock lever side, the lock lever does not normally contact the unlocked position of the lock lever. There is a high possibility that rotation to the rotation cannot be suppressed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a buckle device equipped with a pretensioner for pulling a buckle body toward a tightening side, to reliably prevent a tongue plate from being detached from the buckle body by operation of the pretensioner. Simplification of the structure in which the tongue plate is not detached from the buckle body by the operation of.

[0011]

A buckle device according to claim 1, comprising a tongue plate connected to the webbing, and a buckle body into and from which the tongue plate is inserted and removed, and a buckle for tightening the webbing in a vehicle emergency. In a buckle device equipped to pull the main body toward the tightening side by a pretensioner, the buckle main body is rotatably provided on the frame and is rotatably engaged with the tongue plate when the tongue plate is inserted and always engages with the tongue plate. A hook member pivotally urged in the disengagement direction, a release button for disengaging the hook member from the tongue plate, and a disengagement direction of the hook member when engaged with the tongue plate When the release button is disengaged, the urging member is moved to the first position for suppressing the rotation of the release button by the urging force of the urging member. A lock bar which is pushed by a button and moves to a second position which allows the hook member to rotate in the disengagement direction, and locks the hook member in an engaged state with the tongue plate so that the hook member cannot be disengaged. A lock lever rotatable between a position and a disengaged unlocked position and constantly urged to the unlocked position, wherein the lock lever is pivoted eccentrically from the center of gravity of the frame. When the pretensioner is actuated, the lock lever is rotated to the locked position by receiving the inertial force immediately after the movement of the buckle main body. In response, the lock lever is moved to the second position to prevent the lock lever from rotating from the lock position to the unlock position.

When the tongue plate is inserted into the buckle main body, the hook member rotates and engages with the tongue plate along with the insertion of the tongue plate, and the lock bar is moved from the second position by the urging force of the urging member. The hook member is moved to the first position to prevent the hook member from rotating in the disengagement direction. When the release button is disengaged when the tongue plate is disengaged, the lock bar is moved from the first position to the second position, and the rotationally biased hook member is rotated in the disengagement direction. Since the engagement with the tongue plate is released, the tongue plate can be detached.

In a normal state where the pretensioner does not operate, the lock lever is constantly biased to the unlocked position. By the way, in the event of a vehicle emergency, the pretensioner is activated, the buckle body is retracted to the tightening side of the webbing, and then suddenly stops.First, immediately after the buckle body starts moving, the lock lever is rotated to the lock position by the inertial force. Then, when the buckle body is suddenly stopped, the lock bar moves to the second position under the inertial force, and the lock bar prevents the lock lever from rotating from the lock position to the unlock position. After the pretensioner is actuated, the lock bar is urged by the urging member to return to the first position, whereby the lock lever is urged to the unlocked position to rotate and return to a normal state.

As described above, if the lock lever is not provided, when the buckle body is suddenly stopped, the lock bar moves from the first position to the second position under the inertial force, the hook member is disengaged, and the tongue plate is released. May be detached from the buckle body, but by providing the lock lever, even if the lock bar moves to the second position, the lock bar does not rotate the lock lever from the lock position to the unlock position. As a result, the tongue plate can be reliably prevented from detaching from the buckle body.

Moreover, with a simple structure including a lock lever and the like, it is possible to prevent the tongue plate from being detached from the buckle body by the operation of the pretensioner.
This is advantageous in terms of manufacturing cost. Furthermore, when the buckle body is suddenly stopped, the lock bar moves to the second position due to the inertial force. However, since the lock bar can be elastically received by the urging member, the lock bar may be damaged or deformed. Functioning normally.

According to a second aspect of the present invention, in the first aspect of the present invention, the lock bar moved to the second position when the buckle body suddenly stops comes into contact with the tip of the lock lever, and the lock lever is moved to the lock position. A contact portion for holding is formed. That is, when the buckle body is suddenly stopped, the lock bar moved to the second position comes into contact with the contact portion of the lock lever, and the lock lever is held at the lock position and is reliably prevented from rotating to the unlock position. Can be.

According to a third aspect of the present invention, in the buckle device according to the second aspect of the present invention, the lock lever has an inclined guide portion that receives a turning force from the lock bar moving to the second position toward the lock position. Things. In other words, when the lock lever is about to move from the lock position to the unlock position, the lock bar that moves to the second position comes into contact with the inclined guide portion of the lock lever, and the lock lever receives rotational power toward the lock position. The lock lever can be forcibly rotated and held at the lock position.

The buckle device according to claim 4 is the buckle device according to claims 1 to 3.
In any one of the inventions, the center of gravity of the lock lever is
The lock lever is provided so as to rotate toward the lock position by an inertial force acting on the center of gravity of the lock lever when the buckle body is moved. In other words, the lock lever can be reliably turned to the lock position by the inertial force applied immediately after the start of the movement of the buckle body.

The buckle device according to claim 5 is the buckle device according to claims 1-4.
In any one of the inventions, the lock lever includes a first lever and a second lever that can rotate around a common axis, and when the pretensioner is activated, the lock lever rotates by inertia immediately after the buckle body starts moving. The second lever is pushed by the first lever to rotate to the locked position, and the second lever is held at the locked position by inertia when the buckle body is suddenly stopped. It is.

In this buckle device, the second lever is pushed by the first lever which is rotated by inertia immediately after the movement of the buckle body is started, and is rotated to the lock position. Is held at the lock position by inertia. That is, when the buckle body is suddenly stopped, the lock bar moves to the second position, and the rotation of the second lever from the locked position to the unlocked position is more reliably suppressed, and the tongue plate is detached from the buckle body. Can be reliably prevented.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. The vehicle seat belt device includes a buckle device unique to the present application for connecting the webbing worn by the occupant to the vehicle body side, and a pretensioner for retracting the buckle body of the buckle device to the webbing tightening side in order to tighten the webbing in a vehicle emergency. Are provided. In addition, the buckle device 1 shown in FIGS. 1 to 7 will be described by defining the direction of arrow A as the front for convenience of description and defining front, rear, left and right as shown in FIG.

As shown in FIGS. 1 to 3, the buckle device 1 basically includes a tongue plate 2 movably mounted at an intermediate portion of a webbing (not shown), and a buckle main body 5. An insertion port 6 for inserting the tongue plate 2 is provided at a front end of the main body 5. The tongue plate 2 has a metal tongue 3 inserted into the buckle main body 5 and a tongue main body 4 integrally formed with the tongue 3 and covered with a synthetic resin material.
Is formed with a rectangular engaging hole 3a, and the tongue main body 4 is formed with a webbing passing hole 4a.

As shown in FIGS. 1-3, the buckle body 5
Is a frame 10, a hook member 20, a lock bar 30,
An ejector 40 made of synthetic resin, a release button 50 made of synthetic resin, a lock lever 60, a compression coil spring 70,
71, a connecting member 7 fixed to the frame 10 with rivets 72 for connecting the buckle device 1 to the pretensioner
3. It is composed of a base cover 74 and a lid cover 75 made of synthetic resin. Parts other than the synthetic resin parts are made of metal (for example, steel). Note that the buckle body 5 may be connected to the pretensioner via a member other than the connecting member 73.

The frame 10 includes a board portion 11 and a pair of side plate portions 12 erected from both right and left edges of the board portion 11.
Are integrally formed. A round hole 11a for a rivet 72, a compression coil spring 71 for elastically urging the ejector 40 forward, a rectangular hole 11b for guiding the movement of the ejector 40, and a rear end of the rectangular hole 11b are provided in the substrate portion 11. A spring connecting portion (not shown) projecting from the edge,
An inclined portion 11c that engages with the base cover 74 is formed.

Both ends of the lock bar 30 are inserted into the pair of side plate portions 12 so as to be slidably guided in the front-rear direction.
A pair of long holes 12a, a notch pivot portion 12b for pivotally supporting the hook member 20, a pair of stopper portions 12c for locking the release button 50 so that the release button 50 does not come off, and an insertion of the tongue plate 2. A pair of guide projections 12d are formed to guide the removal and prevent the tongue plate 2 from being twisted at the time of insertion. A pair of shaft holes 13a are formed in the side plate rear portion 13 of the pair of side plate portions 12 for inserting both ends of a left-right shaft member 64 fixedly fitted into the lock lever 60 and rotatably supporting the shaft members. A spring mounting portion 13b for mounting one end of a torsion spring 65 that urges the lock lever 60 upward is formed in the rear portion 13 of the left side plate.

As shown in FIG. 1 to FIG.
Is a main body 21, a restricting portion 22 bulging upward from the main body portion 21 to the upper side, and a lower end bent from the restricting portion 22 to be engageable with the engaging hole 3 a of the tongue plate 2. Hook portion 23 whose portion can be fitted into the front end portion of rectangular hole 11b of substrate portion 11, and a pair of left and right pivoted support portions 24 at the rear portion.
A pair of operated parts 25 bent downward from the rear end of the main body 21 and operated by the ejector 40; and a spring receiving part 26 bent upward from between the operated parts 25. It has. A pair of left and right pivoted support portions 24 is rotatably mounted on a pair of notch pivotal support portions 12b of the pair of side plate portions 12, and the hook member 20 is rotatable up and down by a predetermined angle.

The lock bar 30 will be described with reference to FIG.
As shown in FIG. 3, the lock bar 30 is formed of a plate-like member, and the lock bar 30 is mounted on the pair of side plate portions 12 while being inserted through the pair of long holes 12a. In the mounted state, the left and right ends of the lock bar 30 protrude outside the side plate portion 12 by about 2 to 3 mm, respectively.
0 is movable a predetermined distance back and forth along the pair of long holes 12a. A spring receiving portion 31 is formed in the center of the rear end of the lock bar 30 so as to protrude, and a coil spring 70 (for the urging member) is provided between the spring receiving portion 26 of the hook member 20 and the spring receiving portion 31 of the lock bar 30. Equivalent) is interposed in compressed form,
The lock bar 30 is urged forward, and the hook member 20 is constantly urged upward (in the direction of releasing the engagement with the tongue plate 2).

When the tongue plate 2 is inserted into the buckle body 5 and engaged with the hook member 20, the lock bar 30 is positioned at the first position corresponding to the front end of the pair of elongated holes 12a and regulated. By pressing the portion 22 from above, the rotation of the hook member 20 in the disengaging direction (upward) is suppressed, and the lock bar 30 is pushed rearward by the release button 50 when the release button 50 is disengaged. Moved 1
It is located at the second position corresponding to the rear end portion of the pair of long holes 12a and is retracted from the regulating portion 22 to allow the hook member 20 to rotate in the disengagement direction.

Referring to the ejector 40, as shown in FIGS. 1 to 3, the ejector 40 has a front end inclined portion 41, left and right guided portions 42, and a hook member 20 when the tongue plate 2 is inserted. And a pair of operating portions 43 for rotating the pair of operated portions 25 rearward to rotate the hook member 20 in the engaging direction, and for pushing the release button 50 forward when the tongue plate 2 is disengaged. Left and right 1
A pair of pressing portions 44 and a spring connecting portion 46 to which the front end of the coil spring 71 is connected are provided. Ejector 40
Are guided on the substrate portion 11 of the frame 10 so as to be movable back and forth, and are guided so as not to float by engaging a pair of guided portions 42 with both side edges of the rectangular hole 11b.

The front end of the coil spring 71 is connected to the spring connecting portion 46.
And the rear end of the coil spring 71 is connected to a spring connecting portion (not shown) of the substrate portion 11, so that the ejector 40 is moved forward (that is, the tongue plate) with respect to the frame 10 by the urging force of the coil spring 71. 2 is released.

The release button 50 will be described.
As shown in FIGS. 1 to 3, the release button 50 includes a front end wall portion 51 at a front end, a pair of left and right guide wall portions 52, and an upper end wall portion 53 at an upper end. A pair of guide walls 52
Are located on the outside of the pair of side plate portions 12 of the frame 10, respectively, and the pair of guide wall portions 52 have both ends of the lock bar 30 projecting outside the pair of long holes 12 a. Are formed in a pair of guide grooves 54 for guiding the front and rear movably.

When the release button 50 is in the forward limit position (FIG. 2,
In the state shown in FIG.
Is located slightly behind the front end of the elongated hole 12a,
Each guide wall 52 has a receiving portion 55 formed at the front edge of the guide groove 54 and receiving the end of the lock bar 30 moved from the second position to the first position. 1
The pair of receiving portions 55 formed on the pair of guide wall portions 52 are stop restriction portions formed integrally with the release button 50, and the lock bar 30 is moved to the first position by the urging force of the coil spring 70. At this time, a stop restricting portion that receives the lock bar 30 against the urging force is configured.

A pair of stopper portions 12c of the pair of side plate portions 12 of the frame 10 are provided on the upper wall portion 53 of the release button 50.
A pair of left and right slits 56 are formed to allow the release button 50 to move back and forth with respect to the lock bar 30 when the tongue plate 2 is inserted.
When moving from the position to the first position and being received by the pair of receiving portions 55, the pair of locked portions 57 at the rear ends of the pair of slits 56 are respectively locked by the pair of stopper portions 12c and released. The button 50 stops at the forward limit position.

When the tongue plate 2 is detached from the buckle main body 5 on the inner surface of the front end wall portion 51 of the release button 50, the tongue plate 2 comes into contact with a pair of pushing portions 44 of the ejector 40 and is pushed forward. When the tongue plate 2 is detached from the buckle main body 5 when the pair of pushed portions 58 are formed,
Ejector 40 urged by the urging force of coil spring 71
As a result, the release button 50 is pushed forward together with the tongue plate 2 (toward the tongue plate releasing side), the release button 50 is returned to the forward limit position, and the ejector 40 stops. Even in this state, the ejector 40 receives the urging force of the coil spring 71 and pushes the release button 50 forward to form the rectangular hole 1 formed in the frame 10.
1b, with a slight gap left between it and the front end.

The lock lever 60 will be described. FIG.
As shown in FIG. 4, the lock lever 60 is
A base portion 61 disposed between the pair of side plate rear portions 13 and having an elliptical axial cross section in the left-right direction, and a pair of lever portions 62 extending substantially forward from both left and right end portions of the base portion 61. A pivot 61 a is formed in the base 61 at a position eccentric from the center of gravity of the lock lever 60 in the left-right direction.
A shaft member 64 as a pivot portion is fixedly inserted in a. The shaft member 64 has a pair of shaft holes 13 at both ends.
a, whereby the lock lever 60 is rotatably supported by the pair of side plate rear portions 13 via the shaft member 64. A notch 61 b is formed at the front end of the base 61 so as not to interfere with the spring receiving portion 26 of the hook member 20.

The lower part of the front end of the pair of left and right lever portions 62 has
A pair of holding portions 62a are formed, and the lever portion 62 has a front end portion including the holding portion 62a positioned above the long hole 12a, and the hook member 20 engaged with the tongue plate 2 is formed.
4 and 5, and a pressing portion 62a is provided on the rear slope portion of the regulating portion 22 of the hook member 20 in the engaged state with the tongue plate 2.
And a lock position (see FIGS. 6 and 7) for locking the hook member 20 so that the hook member 20 cannot be disengaged.

A spring mounting portion 63 is formed at the rear end of the left lever portion 62, and one end of the spring mounting portion 63 is formed at the side plate rear portion 13.
The other end of the torsion spring 65 attached to 3b is attached to the spring attachment 63. The torsion spring 65 constantly urges the lock lever 60 to rotate upward to the unlock position. In a normal state where the pretensioner does not operate, the lock lever 60 is located at the unlocked position.

As shown in FIGS. 6 and 7, the lock lever 6
When 0 is in the lock position, the upper surface of most of the lever portion 62 other than the front end is horizontal at substantially the same level as the upper surface of the restricting portion 22 of the hook member 20, and the front end of the upper surface is locked. A contact portion 62b that can contact the bar 30 is formed. Further, the contact portion 6 is provided at the front end of the lever portion 62.
Inclined guide portion 62c inclined downward and forward from the front end of 2b
Are formed.

When the buckle body 5 moves rearward during the operation of the pretensioner, an inertial force acts on the buckle body 5 (lock lever 60) in a forward direction, as shown in FIGS. The center of gravity G of the lock lever 60 is set so that the lock lever 60 is rotated toward the lock position by an inertial force acting on the center of gravity G of the lock lever 60.
It is provided above the shaft member 64.

As described above, the connecting member 73 is fixed to the frame 10 via the rivet 72. As shown in FIGS. 1 to 3, the hook member 20, the lock bar 30, and the ejector 40 are attached to the frame 10. And release button 50
, The lock lever 60, the coil springs 70, 71, and the like are assembled, and they are assembled so as to be housed inside the base cover 74 and the lid cover 75. It is integrated in a fixed state via the engaging portion. The front end of the release button 50 faces the front end of the buckle device 1, and the release button 50 can be pressed and operated by pressing the front end of the release button 50 with a finger.

Next, the operation and effects of the buckle device 1 described above will be described. FIG. 5 shows an engaged state in which the tongue portion 3 of the tongue plate 2 is inserted into the buckle main body 5 and the tongue plate 2 and the hook member 20 are engaged with each other. The tongue portion 3 is locked by engaging with the engagement hole 3a of the frame 3 and the rectangular hole 11b of the frame 10.

The lock bar 30 is located at the first position and abuts on the upper surface of the restricting portion 22 of the hook member 20 to restrict the rotation of the hook member 20 in the disengaging direction. Are locked by the pair of stopper portions 12c, respectively, and the release button 50 is stopped at the forward limit position. In this engaged state, the lock bar 30 is attached to the pair of receiving portions 55 of the release button 50.
The release button 50 is urged forward by the lock bar 30 receiving the urging force of the coil spring 70.

To release the tongue plate 2 from the buckle body 5, the release button 50 is
When the finger is pressed and moved rearward against the urging force of the release button 50, the left and right ends of the lock bar 30 are
Since the lock bar 30 is pushed rearward by the pair of receiving portions 55, the lock bar 30 moves to the second position together with the release button 50,
Since the coil spring 70 is compressed, the hook member 20 is rotated in the disengagement direction via the spring receiving portion 26 of the hook member 20. Then, as shown in FIG.
When the lock bar 30 reaches the second position, the lock bar 30 moves rearward of the restricting portion 22 so that the lock bar 30 does not come into contact with the restricting portion 22, and the hook member 20 pivots upwards as much as possible to disengage. Become.

In this disengaged state, the tongue plate 2 is disengaged from the buckle body 5 forward. At this time, since the front end of the ejector 40 is in contact with the rear end of the tongue plate 2, the tongue plate 2 Is urged forward and comes off. Then, the pair of pushing portions 44 of the ejector 40 are connected to the pair of pushed portions 5 of the release button 50.
When the finger is released from the release button 50 to abut the release button 8, the release button 50 is biased forward by the ejector 40 biased by the biasing force of the coil spring 71,
The release button 50 returns to the forward limit position.

Next, when the tongue plate 2 is inserted into the buckle main body 5 in the detached state of the tongue plate shown in FIG. When the tongue plate 2 is inserted against the urging force of the coil spring 71 and the ejector 40 is pushed, the ejector 4
0, the pair of operating portions 43 at the rear end of the hook member 20 abut on the pair of operated portions 25 of the hook member 20 and rotate backward, so that, as shown in FIG. The lock bar 30 rotates in the engagement direction against the engagement hole 3a of the tongue portion 3 and moves forward from the second position to the first position.

In a normal state in which the pretensioner does not operate, the lock lever 60 does not participate in the insertion / removal operation of the tongue plate 2 and the torsion spring 65
Thus, it is constantly urged to the unlocked position in FIGS. By the way, in the event of a vehicle emergency such as a vehicle collision, the pretensioner operates, the buckle body 5 is retracted by a predetermined amount toward the tightening side of the webbing, and the occupant is firmly restrained by the webbing. Operates so that the lock lever 60 and the like do not separate the tongue plate 2 from the buckle body 5.

When the pretensioner is actuated, the buckle body 5 is retracted to the tightening side of the webbing, that is, backward, and then suddenly stops. First, immediately after the buckle body 5 starts to move backward, the lock lever 60 is moved forward by the forward inertia. Receive strength. As shown in FIG. 5, since the center of gravity G of the lock lever 60 is located above the shaft member 64, the inertial force acting on the center of gravity G acts as a rotating force for rotating the lock lever 60 toward the lock position, As shown in FIG. 6, the lock lever 60 rotates to the lock position, and the pair of pressing portions 62 a of the lock lever 60 abut on the rear slope of the regulating portion 22 of the hook member 20.

Subsequently, when the buckle body 5 stops suddenly, the lock bar 30 receives a backward inertial force. This inertia force acts as a force for moving the lock bar 30 to the second position, and before the lock lever 60 rotates from the lock position to the unlock position, as shown in FIG.
Move from the first position to the second position against the urging force of the coil spring 70 due to the inertial force received when the buckle body 5 stops suddenly. Then, the lock bar 30 moved to the second position
Contacts the contact portion 62b of the lock lever 60 to hold the lock lever 60 at the lock position, thereby suppressing the rotation of the lock lever 60 from the lock position to the unlock position.

After the operation of the pretensioner, the lock bar 30 returns from the second position to the first position by the urging force of the coil spring 70, whereby the lock lever 60 is unlocked from the locked position by the torsion spring 65. The tongue plate 2 is rotated by being urged to the position, and returns to the normal state, so that the occupant can freely insert and remove the tongue plate 2 from the buckle body 5.

As described above, if the lock lever 60 is not provided, when the buckle body 5 is suddenly stopped, the lock bar 30 is moved from the first position to the second position by receiving a rearward inertia force,
Although the hook member 20 may be disengaged from the tongue plate 2 and the tongue plate 2 may be disengaged from the buckle main body 5, the provision of the lock lever 60 allows the lock bar 30 to move to the second position. The lock bar 30
Since the rotation of the lock lever 60 from the lock position to the unlock position is suppressed, it is possible to reliably prevent the tongue plate 2 from being detached from the buckle main body 5.

In addition, the tongue plate 2 can be prevented from being detached from the buckle body 5 by the operation of the pretensioner with a simple structure including the lock lever 60 and the like, which is advantageous in terms of manufacturing cost. Furthermore, when the buckle body 5 is suddenly stopped, the lock bar 30 moves to the second position due to the inertial force. However, the lock bar 30 can be elastically received by the coil spring 70. Works normally without deformation.

A contact portion 62b for holding the lock lever 60 at the lock position by contacting the lock bar 30 moved to the second position when the buckle main body 5 stops suddenly is formed at the tip of the lever portion 62 of the lock lever 60. Therefore, the lock lever 30 can reliably hold the lock lever 60 at the lock position, and can reliably prevent the lock lever 60 from rotating to the unlock position.

The lever portion 62 of the lock lever 60 is
Since the lock lever 60 has the inclined guide portion 62c that receives the rotational power from the lock bar 30 that moves to the lock position to the lock position side, when the lock lever 60 is about to move from the lock position to the unlock position, or when the buckle body 5 starts to move. When the rotation of the lock lever 60 to the lock position is delayed, the lock bar 30 that moves to the second position comes into contact with the inclined guide portion 62c, and the lock lever 60 receives the rotating force toward the lock position. Can be forcibly rotated and held at the lock position.

In the worst case, when the buckle body 5 suddenly stops, even if the lock bar 30 collides with the tip of the lock lever 60, the lock bar 30 is located at the first position. The lock bar 30 can prevent the hook member 20 from rotating and being disengaged from the tongue plate 2.

Next, a buckle device 1A of another embodiment in which the lock lever 60 of the buckle device 1 is changed will be described. However, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIGS.
The lock lever 60A of the buckle device 1A includes a first lever 80 and a second lever 85 that can rotate around a common axis.

The second lever 85 has a base portion 86 and a pair of lever portions 87, and a pivot hole 86a is formed in the base portion 86 at a position eccentric from the center of gravity of the second lever 85 in the left-right direction.
The shaft member 64 as a pivot portion is fixedly inserted through the pivot hole 86a. Further, a rear end portion of the first lever 80 is rotatably supported by, for example, the shaft member 64, and the first lever 80 and the second lever 85 can independently rotate around a common axis.

A pressing portion 87a, a contact portion 87b, and an inclined guide portion 87c are formed on a lever portion 87 of the second lever 85.
The second lever portion 85 positions the front end portion including the holding portion 87a above the long hole 12a, and the tongue plate 2
The unlocked position (see FIGS. 8 and 9) at which the hook member 20 in the engaged state can be disengaged (permits the disengagement) (see FIGS. 8 and 9), and the main body 2 of the hook member 20 engaged with the tongue plate 2
A lock position (FIG. 1) in which the pressing portion 87a is brought into contact with the upper surface of the front end of the lock member 1 to lock the hook member 20 so that the engagement thereof cannot be released.
0, see FIG. 11).

The first lever 80 is formed with a pressing portion 80a which can contact the upper surface of the second lever 85.
0 is rotatable to the locked position together with the second lever 85, and is rotatable to the unlocked position together with or independently of the second lever 85. The first lever 80 and the second lever 85 are urged toward the unlocked position by urging members (not shown). It is sufficient that at least the second lever 85 is always urged toward the unlocked position by the urging member.

When the buckle body 5 moves rearward during the operation of the pretensioner, an inertia force acts forward on the lock lever 60A.
The center of gravity G1 of the second lever 85 is provided above the shaft member 64 so as to rotate the first lever 80 toward the locked position by the inertial force acting on the center of gravity G1 of the first lever 80. Is provided below the shaft member 64 so that the second lever 85 is rotated toward the unlocked position by an inertial force acting on the center of gravity G2 of the second lever 85.

However, when the buckle body 5 moves rearward, the rotational force for rotating the first lever 80 toward the lock position by the inertial force acting on the first lever 80 causes the inertial force acting on the second lever 85. The mass and the center of gravity G of the first lever 80 and the second lever 85 are larger than the rotational force for rotating the second lever 85 to the unlock position.
1, G2, etc. are set.

The operation and effect of the buckle device 1A will be described. FIG. 8 shows a state where the tongue plate 2 is detached from the buckle main body 5, and FIG. 9 shows a state where the tongue plate 2 is inserted into the buckle main body 5. In the normal state where the pretensioner does not operate, the first and second levers 80 and 85 of the lock lever 60A
Are always biased to the unlocked position.

By the way, in the event of a vehicle emergency such as a vehicle collision, the pretensioner operates, the buckle body 5 is retracted rearward, and then suddenly stops. First, immediately after the buckle body 5 starts moving backward, The lock lever 60A receives a forward inertial force. As shown in FIG. 9, since the center of gravity G1 of the first lever 80 is located above the shaft member 64,
The inertial force acting on the center of gravity G1 acts as a rotating force for rotating the first lever 80 toward the locked position.

On the other hand, since the center of gravity G2 of the second lever 85 is located below the shaft member 64, the inertial force acting on the center of gravity G2 serves as a rotating force for rotating the second lever 85 toward the unlocked position. work. As described above, since the turning force of the first lever 80 toward the lock position is set to be larger than the turning force of the second lever 85 toward the unlock position, as shown in FIG. , The first rotating by the inertial force
The second lever 85 is pushed by the pushing portion 80 a of the lever 80 to rotate to the locked position, and the pair of holding portions 87 a of the second lever 85 abut on the upper surface of the front end of the main body 21 of the hook member 20.

Subsequently, when the buckle body 5 is suddenly stopped, the lock bar 30 receives a rearward inertial force, and the second lever 85
Before turning from the locked position to the unlocked position, the lock bar 30 moves from the first position to the second position against the urging force of the coil spring 70 as shown in FIG. At this time, the inertia force acting on the center of gravity G2 of the second lever 85 acts as a force for holding the second lever 85 at the lock position, so that the inertia force holds the second lever 85 on the lock position side and the second position. The lock bar 30 that has moved to
The contact portion 87b of the lever 85 is securely contacted, and the first lever 85 is securely held at the lock position. When the buckle body 5 stops suddenly, the first lever 80 rotates to the unlocked position by receiving the inertial force and the urging force, but there is no problem.

As described above, the lock lever 60A has the first lever 80 and the second lever 85 that can rotate around a common axis.
When the pretensioner is activated, the second lever 85 is pushed by the first lever 80 which is rotated by inertia immediately after the movement of the buckle main body 5 starts to rotate to the lock position, and the buckle main body 5 is suddenly moved. Since the second lever 85 can be held at the lock position by inertia when stopped, the lock bar 30 moves to the second position when the buckle main body 5 stops suddenly, and the second lever 85 moves from the locked position to the unlocked position. Of the tongue plate 2 can be reliably prevented from being detached from the buckle main body 5. Other operations and effects similar to those of the above-described embodiment are exhibited.

The buckle devices 1 and 1A are merely examples, and various modifications can be made to each component without departing from the spirit of the present invention.

[0067]

According to the buckle device of the first aspect, in particular, the lock member locks the hook member engaged with the tongue plate so that the hook member cannot be disengaged and the unlocked position where the hook member can be disengaged. A lock lever that is rotatable and constantly biased to the unlocked position is provided, and the lock lever is rotatably supported on the frame via a pivot portion eccentric from its center of gravity, so that when the pretensioner is operated, At
Immediately after the start of the movement of the buckle body, the lock lever rotates to the lock position under the inertia force, and when the buckle body is suddenly stopped, the lock bar moves to the second position under the inertia force to release the lock lever from the lock position. Rotation to the lock position can be suppressed.

That is, if the lock lever is not provided, when the buckle body is suddenly stopped, the lock bar moves from the first position to the second position due to inertial force, the hook member is disengaged, and the tongue plate is disengaged. Although there is a risk of detachment from the main body, even if the lock bar moves to the second position, the lock bar prevents the lock lever from rotating from the lock position to the unlock position even if the lock bar moves to the second position. Therefore, it is possible to reliably prevent the tongue plate from detaching from the buckle body. In addition, since the tongue plate can be prevented from being detached from the buckle main body by the operation of the pretensioner with a simple structure including a lock lever and the like, it is advantageous in terms of manufacturing cost. Further, when the buckle body is suddenly stopped, the lock bar moves to the second position under the inertial force. However, the lock bar can be elastically received by the urging member, so that the lock bar and the like are not damaged or deformed. Can function normally.

According to the buckle device of the second aspect, the lock bar moved to the second position when the buckle body suddenly stops comes into contact with the tip portion of the lock lever to form a contact portion for holding the lock lever in the lock position. Therefore, the lock lever can be securely held at the lock position by the lock bar, and the rotation of the lock lever to the unlock position can be reliably suppressed.

According to the buckle device of the third aspect, since the lock lever has the inclined guide portion that receives the turning power from the lock bar that moves to the second position toward the lock position, the lock lever moves from the lock position to the unlock position. When the lock bar moves to the second position, the lock bar moves to the lock position because the lock bar that moves to the second position comes into contact with the tilt guide of the lock lever, and the lock lever receives rotational power toward the lock position. Can be held.

According to the buckle device of the fourth aspect, the center of gravity of the lock lever is provided so as to rotate the lock lever toward the lock position by the inertial force acting on the center of gravity of the lock lever when the buckle body moves. As a result, the lock lever can be reliably turned to the lock position by the inertial force that acts immediately after the movement of the buckle body starts.

According to the buckle device of the fifth aspect, the lock lever has the first lever and the second lever rotatable about a common axis.
A first lever that is rotated by inertia immediately after the movement of the buckle body starts when the pretensioner is actuated;
The second lever is pushed by the lever to rotate to the lock position,
When the buckle body is suddenly stopped, the second lever is held at the lock position by inertia force. Therefore, when the buckle body is suddenly stopped, the lock bar moves to the second position, and the lock lever is locked from the locked position. The rotation to the lock position can be more reliably suppressed, and the tongue plate can be reliably prevented from detaching from the buckle body.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a buckle device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway longitudinal perspective view of the buckle device.

FIG. 3 is a vertical sectional side view of the buckle device.

FIG. 4 is a longitudinal sectional side view of the buckle device (with no tongue plate inserted).

FIG. 5 is a vertical sectional side view of the buckle device (with a tongue plate inserted).

FIG. 6 is a vertical sectional side view of the buckle device (immediately after the start of the movement of the buckle body).

FIG. 7 is a vertical sectional side view of the buckle device (when the buckle body is suddenly stopped).

FIG. 8 is a longitudinal side view of a buckle device (with no tongue plate inserted) according to another embodiment.

FIG. 9 is a longitudinal sectional side view of the buckle device (with a tongue plate inserted).

FIG. 10 Buckle device (immediately after starting movement of the buckle body)
It is a vertical side view.

FIG. 11 is a vertical sectional side view of the buckle device (when the buckle body is suddenly stopped).

[Explanation of symbols]

 1, 1A Buckle device 2 Tongue plate 5 Buckle body 10 Frame 20 Hook member 30 Lock bar 40 Ejector 50 Release button 60, 60A Lock lever 62b, 87b Contact portion 62c, 87c Inclined guide portion 64 Shaft member 65 Torsion spring 70, 71 Coil spring 80 First lever 86 Second lever

Claims (5)

[Claims] 1. A tongue plate connected to a webbing, and a buckle body into which the tongue plate is inserted and detached, and the buckle body is provided to be pulled toward a tightening side by a pretensioner to tighten the webbing in a vehicle emergency. In the buckle device, the buckle body is provided on the frame, and the hook is rotatably provided on the frame, the hook is rotated when the tongue plate is inserted, is engaged with the tongue plate, and is always urged to rotate in the disengagement direction. A release button for releasing the engagement between the hook member and the tongue plate; and a first position for inhibiting the rotation of the hook member in the disengagement direction when in engagement with the tongue plate. It is moved by the urging force of the member and pushed by the release button during the release operation of the release button. A lock bar that moves to a second position allowing rotation of the tongue plate. The lock bar locks the hook member in an engaged state with the tongue plate so that the hook member cannot be disengaged and a unlocked position where the engagement can be disengaged. A lock lever which is rotatable and is always urged to the unlocked position side, wherein the lock lever is rotatably supported by a frame via a pivot portion eccentric from its center of gravity, and the pretensioner When the buckle body starts to move, the lock lever receives the inertia force to rotate to the lock position immediately after the start of the movement of the buckle body.
A buckle device configured to move to a position to inhibit rotation of the lock lever from the locked position to the unlocked position. 2. A contact portion formed at a tip portion of the lock lever with a lock bar moved to a second position when the buckle body is suddenly stopped to hold the lock lever in the lock position. The buckle device according to claim 1. 3. The buckle device according to claim 2, wherein the lock lever has an inclined guide portion that receives a rotational force from the lock bar that moves to the second position toward the lock position. 4. The center of gravity of the lock lever is provided so as to rotate the lock lever toward the lock position by inertia force acting on the center of gravity of the lock lever when the buckle body is moved. The buckle device according to any one of claims 1 to 3, wherein 5. The lock lever includes a first lever and a second lever that are rotatable around a common axis. When the pretensioner is activated, the lock lever is rotated by inertia immediately after the buckle body starts moving. The second lever is pushed by the first lever to rotate to the locked position, and the second lever is held at the locked position by inertia when the buckle body is suddenly stopped. The buckle device according to any one of claims 1 to 4.