JP2001046117A - 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 at the time of a vehicle emergency, realizing the smooth and reliable inserting/releasing action of the tongue plate in a normal state, and of simplifying the structure for preventing the tongue plate from being released from the buckle body at the time of the vehicle emergency. SOLUTION: This buckle device is provided with a lock member 60, which has first and second coupling sections 63, 64 and is pivotally supported on a frame 10 rotatably ranging over a lock position where the movement of a lock bar 30 located at a first position to a second position is suppressed and a non-lock position where the movement is not suppressed, and a torsion spring 66 elastically exciting the lock member 60 to the non-lock position side. When a pretensioner is not operated and is operated, the lock bar 30 excited to the first position abuts on the first coupling section 63 to rotate the lock member 60 to the lock position. When a buckle body 5 is abruptly stopped after the pretensioner is operated, the lock bar 30 starting to move to the second position side by inertial force is accepted by the second coupling section 64, thereby suppressing the movement of the lock bar 30 to the second 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 more particularly to a buckle device having an improved structure for preventing the tongue plate from being detached from the buckle body in a vehicle emergency.

[0002]

2. Description of the Related Art Conventionally, a seat belt device mounted on a vehicle includes a buckle device including a tongue plate movably mounted at an intermediate portion of the webbing, and a buckle body into which the tongue plate is inserted and detached. The buckle device allows the webbing worn by the occupant to be easily and reliably releasably fixed to the vehicle body side.

The buckle device described in Japanese Utility Model Laid-Open Publication No. Hei 6-66311 has a basic configuration in which a buckle main body is supported by the buckle main body in a swingable manner so as to be engaged with and disengaged from a tongue plate. Switchable 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, a release button urged by a coil spring in a tongue plate extracting direction, and the like. It has.

Further, in the buckle device disclosed in this publication, the lock lever is rotated near the lock pin in preparation for the case where the buckle body is pulled in to the tightening side by a pretensioner in order to tighten the webbing in 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.

Further, a plate-like inertia 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 the pretensioner that operates in the event of a vehicle emergency, the inertial body receives inertia force on the lock lever side and moves against the urging force of the spring member, and moves to the lock lever. The contact prevents the lock lever from rotating to the unlocked position.

That is, the lock pin rotates the lock lever to the unlocked position to prevent the hook member from being disengaged and the tongue plate from being detached from the buckle body.

[0007] In the buckle device disclosed in Japanese Patent Publication No. 4-58963, a latch member which can be disengaged from a tongue plate,
An operation member for releasing the engagement of the latch member, a lock member for moving to the release position in conjunction with the operation of the operation member and releasing the engagement of the latch member, and the disengagement of the latch member can be prevented. A lock mechanism is provided. The lock mechanism is provided with a movement restricting member rotatably supported by the operation member and partially intervening in the movement region of the lock member. While being in the movement area, the moving lock member comes into contact with the movement restricting member to prevent the lock member from moving to the release position.

[0008]

[Problems to be Solved by the Invention]
In the buckle device described in Japanese Patent Application Publication No. 1 (1994), when the buckle body is suddenly stopped, the inertial body moves toward the lock lever, but all the inertial forces acting on the lock pin act as forces for moving the lock pin to the second position. Therefore, the lock pin may move to the second position at a very high speed.

That is, since the lock lever may rotate to the unlocked position at a very high speed, the inertial body that starts moving from the sudden stop of the buckle body does not normally contact the lock lever, and There is a high possibility that the rotation of the to the unlocked position cannot be suppressed.

Further, 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 comes into contact with the lock pin to transmit the force, the tongue plate is inserted. There is a possibility that the operation or the like cannot be realized smoothly. Further, in order to prevent the tongue plate from being detached from the buckle main body due to the operation of the pretensioner, it is necessary to provide a lock lever, an inertial body, and an urging member for urging each of these members. As a result, the structure becomes complicated, and the assembly of the buckle device becomes complicated, which is disadvantageous in the production cost.

In the buckle device disclosed in Japanese Unexamined Patent Publication No. 4-58963, a part of the movement restricting member intervenes in the movement locus of the lock member in a normal state, but the movement restricting member also rotates due to a vehicle collision or the like. Therefore, the lock member may not come into contact with the movement restriction member while a part of the movement restriction member exists in the movement area. In this case, the latch member is disengaged and the tongue plate is detached. Resulting in.

SUMMARY OF THE INVENTION An object of the present invention is to provide a buckle device having a tongue plate and a buckle main body, which reliably prevents the tongue plate from detaching from the buckle main body in a vehicle emergency, and which is smooth and reliable in a normal state. And to simplify the structure for preventing the tongue plate from being detached from the buckle body in the event of a vehicle emergency.

[0013]

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. A hook member rotatably provided on the frame, which is rotatably engaged with the tongue plate when the tongue plate is inserted, and is always urged to rotate in the disengagement direction; and a hook member and the tongue plate. A release button for releasing the engagement, and a release button for moving the release button with the urging force of the urging member to a first position for suppressing the rotation of the hook member in the disengagement direction when the hook button is engaged with the tongue plate. A lock bar that is pushed by a release button during an engagement release operation and moves to a second position allowing rotation of the hook member in the engagement release direction; A lock member pivotally supported by the frame so as to be rotatable between a lock position for locking the Kubar in the first position and an unlocked position for unlocking the lock, and a biasing member for elastically urging the lock member to the unlock position. A biasing member is provided, and the lock member is attached to the base end portion pivotally supported by the frame, the first engagement portion formed at one end thereof, and the first engagement portion with an interval capable of receiving the lock bar. Opposing second
An engagement portion, wherein in a state where the lock member is located at the lock position, the first position side end of the lock bar abuts on the first engagement portion to maintain the lock position, and the second engagement portion includes It is characterized in that it enters the moving area of the lock bar and approaches and opposes the lock bar.

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 switched to the first position to prevent the hook member from rotating in the disengagement direction. The lock member is rotatably supported at its base end by the frame, and is normally elastically urged to the unlocked position by an urging member in a normal state. Therefore, when the lock bar moves from the second position to the first position, the lock bar does not interfere with the second engagement portion, and the end of the lock bar on the first position side contacts the first engagement portion. The lock member can be rotated to the lock position in contact therewith. When the lock bar moves to the first position, the lock member comes to the lock position, the lock bar is received between the first and second engagement portions, and in this state, the first position of the lock bar is in the first engagement portion. The side end portions abut to maintain the locked position, and the second engagement portion protrudes into the movement area of the lock bar and approaches and opposes the lock bar.

On the other hand, when the tongue plate is to be disengaged from the buckle body, when the release button is disengaged, the lock bar is switched from the first position to the second position, and the pivotally urged hook member is released. The tongue plate can be disengaged because the tongue plate is disengaged from the tongue plate by rotating in the disengagement direction. In the state where the tongue plate is inserted, the second engagement portion protrudes into the movement area of the lock bar and approaches the lock bar, but when the lock bar starts moving from the first position to the second position, Immediately after that,
The lock bar is separated from the first engagement portion of the lock lever, and the lock member urged by the urging member rotates to the unlock position. Since the switching of the lock bar from the first position to the second position is not performed at a high speed due to manual operation, the lock bar contacts the second engagement portion after the lock member rotates to the unlock position. Move to the second position without performing.

By the way, in the event of a vehicle emergency, the first
When the inertia force in the direction of the position acts, the lock bar presses the lock member by the inertia force in addition to the urging force of the urging member, so that the lock bar can be reliably maintained at the locked position. On the other hand, when the inertia force in the direction of the second position acts on the lock bar, the lock bar starts moving to the second position side. As described above, when the tongue plate is inserted into the buckle body, the first position side end of the lock bar abuts on the first engagement portion to maintain the lock position, and the second engagement portion engages with the lock bar. , The lock bar that has started moving to the second position side is received by the second engagement portion, and the movement of the lock bar to the second position is suppressed. Accordingly, it is possible to reliably prevent the hook member from being disengaged and the tongue plate from being detached from the buckle main body.

In a vehicle emergency, when an inertial force in the first position direction acts on the lock bar by an impact force due to a collision, or in a vehicle emergency, the buckle body is moved to a tightening side by a pretensioner in order to tighten the webbing. It is equipped so as to be retracted and functions in any case where the inertia force acts on the lock bar in the second position direction when the pretensioner is operated or when the buckle body is suddenly stopped after the pretensioner is operated.

According to a second aspect of the present invention, in the first aspect of the present invention, the base end of the lock member is pivotally supported on the frame at a position separated from the surface including the moving area of the lock bar on the side opposite to the hook member. It is characterized by having been done. Therefore, the end of the lock bar that moves to the first position on the first position side can push the first engagement portion to reliably rotate the lock member to the lock position and maintain the lock member at the lock position.

According to a third aspect of the present invention, there is provided a buckle device comprising a tongue plate connected to the webbing, and a buckle body into which the tongue plate is inserted and withdrawn. The buckle body is tightened by a pretensioner to tighten the webbing in a vehicle emergency. In the buckle device provided so as to be retracted to the side, the buckle body is rotatably provided on the frame and is rotatably engaged with the tongue plate when the tongue plate is inserted, and is always rotated in the disengagement direction. A urged hook member, a release button for releasing the engagement between the hook member and the tongue plate, and suppressing the rotation of the hook member in the disengagement direction when the hook member is engaged with the tongue plate. It is moved to the first position by the urging force of the urging member and pushed by the release button at the time of the disengagement operation of the release button. A lock bar that moves to a second position that allows the lock member to rotate in the disengagement direction, and a lock position that suppresses the movement of the lock bar that is in the first position to the second position. A lock member pivotally supported by the frame so as to be rotatable over a non-lock position, and a biasing member for elastically biasing the lock member toward the unlock position. A first engaging portion with which the first position side end of the lock bar can abut, and a second engagement with which the lock bar can move into the moving area of the lock bar at the lock position and abut with the second position side end of the lock bar. When the pretensioner is not operating and when the pretensioner is in operation, the lock bar biased to the first position abuts on the first engagement portion to rotate the lock member to the lock position, Due to the inertial force generated when the buckle body suddenly stops after operation The second movement start the lock bar to the position side received by the second engagement portion, and is characterized in that is configured to inhibit movement of the second position of the locking bar.

In a normal state in which the pretensioner does not operate, in a state where the tongue plate is inserted into the buckle main body, the first position side end of the lock bar comes into contact with the first engagement portion to rotate the lock member to the lock position. It can be moved and maintained. In this state, when the second engaging portion protrudes into the movement area of the lock bar and the pretensioner is operated in an emergency of the vehicle, the buckle body is retracted to the tightening side of the webbing and then suddenly stops. Immediately after the start of the movement, the inertia force acts on the lock bar in the direction of the first position. At this time, the lock bar presses the lock member with the inertia force in addition to the urging force of the urging member, and can reliably maintain the lock position.

On the other hand, when the buckle main body is suddenly stopped, the lock bar receives the inertia force and starts moving to the second position. When the tongue plate is inserted into the buckle body, as described above, the lock member is maintained in the lock position, and the second
Since the engagement portion protrudes into the movement region of the lock bar, the lock bar that has started moving to the second position side is received by the second engagement portion, and the movement of the lock bar to the second position is suppressed. Accordingly, it is possible to reliably prevent the tongue plate from being detached from the buckle body. In addition, operations other than the vehicle emergency are substantially the same as those of the first aspect.

The buckle device according to claim 4 is the buckle device according to claims 1-3.
In any one of the inventions, the lock member is rotatably supported by the frame via a pivot portion eccentric from the center of gravity, and when the buckle body is suddenly stopped after the pretensioner is actuated, the lock member is in the lock position. The present invention is characterized in that an inertial force rotating to the side acts. That is, when the buckle body is suddenly stopped, the lock member can be securely held at the lock position, so that the lock bar that has started moving to the second position side can be reliably received by the second engagement portion.

Here, the mass of the lock member and the lock bar, the urging force of the urging member, the pivotal position of the lock member, and the like are set so that the lock member can be held at the lock position by the lock bar when the pretensioner is operated. can do.

The buckle device according to claim 5 is the buckle device according to claims 1-4.
In any one of the inventions, the second engagement portion of the lock member is configured to generate a rotating force for rotating the lock member to the lock position side by contact with the lock bar moving to the second position side. It is characterized by having. Therefore, even when the second engagement portion of the lock member is not completely interposed in the movement region of the lock bar, the second engagement portion can be moved to the second engagement portion.
When the lock bar that has started to move to the position side comes into contact, the lock member can be reliably rotated to the lock position.
That is, it is possible to completely interpose the second engaging portion in the movement region of the lock bar, and to reliably receive the lock bar by the second engaging portion.

[0025]

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. The buckle device 1 shown in FIGS. 1 to 8 will be described by defining front, rear, left and right with the direction of arrow A as the front 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 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,
Ejector 40 made of synthetic resin, release button 50 made of synthetic resin, lock member 60, compression coil springs 70, 7
1, a connecting member 73 fixed to the frame 10 with rivets 72 for connecting the buckle body 5 to the pretensioner;
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). The lock member 60
May be made of synthetic resin or metal. Further, 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 plates 12, and are guided so as to be slidable 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. Further, the pair of side plate portions 12 are formed with a pair of shaft holes 15 for inserting the both end portions of the shaft member 65 in the left-right direction inserted through the lock member 60 and rotatably supporting the shaft members 65, and the right side plate. A spring mounting hole 16 for attaching one end of a torsion spring 66 that urges the lock member 60 to rotate is formed below the shaft hole 15 in the portion 12.

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-shaped 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 wearing state, the left and right ends of the lock bar 30 are
The lock bar 30 is movable a predetermined distance back and forth along the pair of long holes 12a. A spring receiving portion 3 is provided at the center of the rear end of the lock bar 30.
1 is formed in a projecting shape, and a spring receiving portion 2 of the hook member 20 is formed.
A coil spring 70 (corresponding to an urging member) is interposed in a compressed state between the spring bar 6 and the spring receiving portion 31 of the lock bar 30, the lock bar 30 is urged forward, and the hook member 20 is It 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.

The ejector 40 will be described. As shown in FIGS. 1 to 3, the ejector 40 has a front inclined guide portion 41, left and right guided portions 42, and a hook member when the tongue plate 2 is inserted. 20, a pair of operating portions 43 for pushing the pair of operated portions 25 rearward to rotate the hook member 20 in the engagement direction, and for pushing the release button 50 forward when the tongue plate 2 is disengaged. And a pair of right and left pushing portions 44 for connection, and a spring connecting portion 46 to which the front end of the coil spring 71 is connected. Ejector 4
Numeral 0 is disposed on the substrate portion 11 of the frame 10 so as to be movable back and forth, and the pair of guided portions 42 has a substantially U-shaped cross section, and the substantially U-shape is formed on both sides of the rectangular hole 11b. It is guided so as not to float by engaging the edge.

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. A pair of pressed parts (not shown) are formed, and when the tongue plate 2 is detached from the buckle body 5, the release button 50 and the tongue plate 2 are moved forward by the ejector 40 urged by the urging force of the coil spring 71. (Toward the tongue plate release side), release the release button 50 to the forward limit position,
0 stops. Even in this state, the ejector 40
The release button 5 receives the urging force of the coil spring 71.
The frame 10 is stopped with a slight gap left between it and the front end of the rectangular hole 11b formed in the frame 10 so as to push 0 forward.

The lock member 60 will be described. Figure 1
As shown in FIG. 4, the lock member 60 includes a base portion 61 that is disposed between the pair of side plates 12 of the frame 10 and that is long in the left-right direction, and substantially rearward from both left and right ends of the base portion 61. And a pair of lever portions 62 extending to the right. The proximal end 61
It comprises a pair of side plate portions 61a at both left and right ends and a horizontal portion 61b connecting the upper end portions of these side plate portions 61a. A pair of side plates 6
1a, a pair of pivot holes 61c eccentric downward from the center of gravity of the lock member 60 are formed concentrically.
Is inserted through the shaft member 65. Both ends of the shaft member 65 are inserted into the pair of shaft holes 15, whereby the base end 61 of the lock member 60 is connected to the plate 10 via the shaft member 65.
Is rotatably supported at

A rib 61d is integrally formed on the base end 61 of the lock member 60 at a position close to and facing the right side plate 61a. An insertion hole (not shown) through which the shaft member 65 is inserted is formed in the rib 61d. A torsion spring 66 (elastic member) is provided between the side plate portion 61a and the rib 61c that face each other, and the shaft member 65 is inserted through the torsion spring 66. One end of the torsion spring 66 is attached to the horizontal portion 61b of the lock member 60 in a contact manner from below,
The other end is inserted through the spring mounting hole 16 of the frame 10, and the lever portion 62 is constantly elastically biased upward by the torsion spring 66. Note that the rib 61d may be omitted.

Now, the lock member 60 has a base end 61.
And a pair of first engagement portions 63 provided at the distal end portions of the pair of lever portions 62 and a pair of first engagement portions 63 provided at intervals capable of receiving the lock bar 30. A pair of second engaging portions 64 facing each other, and
Lock position for locking the first position (see FIGS. 6 and 7)
, And an unlocked position (see FIGS. 4 and 5) that is not locked, and is always elastically urged toward the unlocked position by a torsion spring 66.

The first engaging portion 63 is provided so that the end (front end) of the lock bar 30 on the first position side can be brought into contact with the lock bar 30, that is, the state where the tongue plate 2 is not inserted, ie, the lock bar 30.
Is in the second position, the lock member 60 is rotationally urged to the unlocked position, and the first engagement portion 63 is located slightly behind the front end of the movement area of the lock bar 30. In addition, as described above, the second engagement portion 6 of the lock member 60
4 and portions other than the first engagement portion 63 are the lock bars 3
There is no intervention in the 0 movement area.

Here, the proximal end 61 of the lock member 60
From the surface including the moving area of the lock bar 30, the hook member 20
, Specifically, the lock bar 30
Is pivotally supported by the frame 10 at a position obliquely above and in front of the moving area of the frame 10. Therefore, the lock bar 3 urged to the first position
0 contacts the first engagement portion 63 to rotate the lock member 60 to the lock position. In this state, the lock bar 30 contacts the first engagement portion 63 to maintain the lock position. In this lock position, the second engaging portion 64 protruding into the movement area of the lock bar 30 approaches the second position side end (rear end) of the lock bar 30 so as to be able to abut. Become.

As shown in FIG. 8, the second engaging portion 64 of the lock member 60 is turned to rotate the lock member 60 to the lock position by contact with the lock bar 30 moving to the second position. To generate power, the locking member 6
In a state where 0 is located in the vicinity of the lock position, it is formed in a shape inclined forward and obliquely downward. In addition, when the buckle body 5 is suddenly stopped after the pretensioner is activated, inertial force acts rearward on the buckle body 5 (lock member 60), but the center of gravity G of the lock member 60 is shifted to the center of gravity G of the lock member 60. The lock member 60 is provided above the pivot (rotation axis) of the lock member 60 so as to rotate the lock member 60 toward the lock position by the inertial force that acts.

As described above, the connecting member 73 is fixed to the frame 10 via the rivet 72, and the hook member 20, the lock bar 30, and the ejector 40 are attached to the frame 10 as shown in FIGS. And release button 50
, The lock member 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 effect of the buckle device 1 described above will be described. FIG. 4 shows a state in which the tongue plate 2 is detached from the buckle main body 5, and the lock member 60 is urged to the unlocked position by the torsion spring 66. In this state, when the tongue portion 3 of the tongue plate 2 is inserted into the buckle main body 5 from the insertion opening 6, the tongue portion 3 first comes into contact with the front end of the ejector 40.

Subsequently, when the tongue plate 2 is further inserted against the urging force of the coil spring 71 and the ejector 40 is pushed, the pair of operating portions 4 at the rear end of the ejector 40 is moved.
3 contacts the pair of operated portions 25 of the hook member 20 and pivots rearward, and as shown in FIG.
0 rotates in the engaging direction against the urging force of the coil spring 70 to engage with the engaging hole 3a of the tongue portion 3, and the lock bar 30 is moved from the second position to the first position by the urging force of the coil spring 70. Move forward.

When the lock bar 30 moves from the second position to the first position, the lock member 60 is in the unlocked position, and the second engagement portion 64 does not intervene in the movement area of the lock bar 30. The bar 30 does not interfere with the second engaging portion 64, and as shown in FIG. 5, the first position side end of the lock bar 30 abuts on the first engaging portion 63, and subsequently, as shown in FIG. As shown, the lock member 60 is rotated to the lock position. Then, the lock bar 30 is received between the first and second engaging portions 63 and 64, and in this state, the first position side end of the lock bar 30 abuts on the first engaging portion 63 to lock the lock position. Is maintained, and the second engaging portion 64 protrudes into the movement area of the lock bar 30 to approach and face the lock bar 30.

The tongue portion 3 of the tongue plate 2 is inserted into the buckle body 5 so that the tongue plate 2
In the engaged state in which the tongue 3 is engaged, the hook portion 23 engages with the engaging hole 3a of the tongue portion 3 and the rectangular hole 11b of the frame 10 to lock the tongue portion 3. In addition, the lock bar 30
Is located at the first position, abuts on the upper surface of the regulating portion 22 of the hook member 20, regulates the rotation of the hook member 20 in the disengaging direction, and a pair of locked portions of the release button 50. 5
7 are locked by a pair of stopper portions 12c, respectively, and the release button 50 is stopped at the forward limit position. In this engaged state, the pair of receiving portions 5 of the release button 50
The release button 50 is urged forward by the lock bar 30 which receives the urging force of the coil spring 70, with both ends of the lock bar 30 abutting on the lock bar 30.

When releasing 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.

Here, in the state where the tongue plate 2 is inserted, the second engaging portion 64 protrudes into the movement area of the lock bar 30 and approaches and opposes the lock bar 30. When you start moving from the position to the second position,
Immediately thereafter, the lock bar 30 separates from the first engagement portion 63,
The lock member 60 urged by the torsion spring 66 starts rotating toward the unlocked position. Since the switching of the lock bar 30 from the first position to the second position is not performed at a high speed due to manual operation, the lock bar 30 is rotated to the unlock position before the lock bar 30 is moved to the second engagement position. It moves to the second position without contacting the part 64.

Then, as shown in FIG.
In the state in which the lock bar 30 has reached the second position, the lock bar 30 moves rearward of the restricting portion 22 and does not come into contact with the restricting portion 22, so that the hook member 20 is pivoted upward to the maximum and the engagement state is released. 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 moves forward. It is energized 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.

In the event of a vehicle emergency such as a vehicle collision, the pretensioner operates to retract the buckle body 5 by a predetermined amount toward the tightening side of the webbing, and the occupant is firmly restrained by the webbing. Apparatus 1
In, the lock member 60 and the like operate so that the tongue plate 2 does not come off from the buckle main 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 locking member 60 is moved forward by the inertia. Receive strength. At this time, the inertia force acts as a rotating force for rotating the lock member 60 to the unlock position, but the lock bar 30
Since the inertial force in the direction of the first position also acts on the coil spring 7, the inertia force and the lock bar 30 are urged to the first position.
The lock member 60 is held by the lock bar 30 by the urging force of 0 so that the lock member 60 can be maintained at the lock position.
It is assumed that the mass and urging force of the lock bar 30 and the pivotal position of the lock member 60 are set.

Subsequently, when the buckle main body 5 is suddenly stopped, the lock bar 30 receives the inertial force and starts moving toward the second position. When the tongue plate 2 is inserted into the buckle main body 5, the lock member 60 is maintained at the lock position, and the second engagement portion 64 protrudes into the movement area of the lock bar 30, as described above. Since the lock bar 30 that has started moving to the second position side
The locking bar 30 can be restrained from moving to the second position by being received by the engaging portion 64, whereby the tongue plate 2 can be reliably prevented from detaching from the buckle main body 5.

The lock member 60 is pivotally supported by the frame 10 via a shaft member 65 as a pivot portion eccentric from the center of gravity of the lock member 60. When the buckle body 5 stops suddenly after the pretensioner is activated, the lock member 60 is locked. Since an inertial force rotating toward the lock position acts on the member 60, the lock bar 30 that has started moving to the second position can be reliably received by the second engagement portion 64.

The second engaging portion 64 of the lock member 60 is
The second engaging portion 6 of the lock member 60 is formed so as to generate a rotating force for rotating the lock member 60 to the lock position side by contact with the lock bar 30 moving to the position side.
Even when the lock bar 30 does not completely intervene in the movement area of the lock bar 30, if the lock bar 30 that has started moving to the second position side contacts the second engagement portion 64, the lock member 60 is securely moved to the lock position. Can be rotated. That is,
The second engaging portion 64 can completely intervene in the movement area of the lock bar 30, and the lock bar 30 can be reliably received by the second engaging portion 64.

Further, the base end portion 61 of the lock member 60 is pivotally supported on the frame 10 at a position separated from the surface including the moving area of the lock bar 30 on the opposite side to the hook member 20.
The first engagement portion 63 is pushed by the first position side end of the lock bar 30 that moves to the first position, thereby reliably rotating the lock member 60 to the lock position and maintaining the lock position reliably. it can.

As described above, in a normal state other than an emergency of the vehicle, the tongue plate 2 is only abutted against the lock bar 30 when the tongue plate 2 is inserted. A reliable insertion and removal operation of the tongue plate 2 can be realized. Furthermore,
A structure in which the tongue plate 2 is not detached from the buckle body 5 in the event of a vehicle emergency can be realized with a simple structure including the lock member 60 and the torsion spring 66, which is extremely advantageous in terms of manufacturing cost.

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 member 60
Is maintained in the locked 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.

Next, a modification of the above embodiment will be described. The pretensioner is omitted and the buckle body 5
May be connected to the vehicle body via the connecting member 73. In other words, although the inertia force due to the operation of the pretensioner and the subsequent sudden stop of the buckle body 5 is not received, the above operation can be realized by the inertial force acting by the impact force in an emergency such as a vehicle collision. When the buckle body 5
The tongue plate 2 can be reliably prevented from being separated from the tongue.

When the buckle main body 5 is suddenly stopped after the operation of the pretensioner, it is not always necessary that the locking member 60 maintain the locked position by its inertia. That is, when the buckle body 5 is suddenly stopped, at least the inertial force acting on the lock
The lock bar 30 does not contact the second engagement portion 64 even if the lock bar 30 does not act as a rotation force for rotating the lock bar 30 toward the unlock position. You should be able to do it.

The lock member 60 may be pivotally supported at an intermediate position in the front-rear direction. The structure of the buckle device 1 is merely an example, and various modifications can be made to each component without departing from the spirit of the present invention. Further, the buckle device of the present embodiment is not limited to a seat belt device mounted on a vehicle such as an automobile, but can be applied to a buckle device mounted on an airplane, a high-speed ship, and the like.

[0064]

According to the buckle device of the first aspect, when the tongue plate is inserted into the buckle main body, the first position side end of the lock bar contacts the first engagement portion to lock the lock member. The lock member is maintained in the lock position by rotating the lock bar to the position, and the second engagement portion protrudes into the movement area of the lock bar and is close to and opposed to the lock bar. Starts moving toward the second position, the lock bar can be received by the second engagement portion, and the movement of the lock bar to the second position can be suppressed. The release of the tongue plate from the buckle body upon release can be reliably prevented.

Moreover, in a normal state other than a vehicle emergency, the tongue plate is merely brought into contact with the lock bar when the tongue plate is inserted, and has little to do with the tongue plate insertion / removal operation. , A detaching operation can be realized. Furthermore, a structure that does not separate the tongue plate from the buckle body in the event of a vehicle emergency,
It can be realized with a simple structure consisting of a lock member and a biasing member,
This is very advantageous in terms of manufacturing cost. Further, when the tongue plate is inserted, the lock bar that moves to the first position by the urging force can be elastically received via the first engagement portion, and the first engagement portion and the like function as a cushion, and the lock bar This can be effective because contact noises of the user can be reduced.

According to the buckle device of the second aspect, the base end portion of the lock member is pivotally supported on the frame at a position separated from the surface including the moving area of the lock bar toward the opposite side to the hook member. The first position side end of the lock bar that moves to the first position pushes the first engagement portion to reliably rotate the lock member to the lock position, thereby securely maintaining the lock position.

According to the buckle device of the third aspect, when the tongue plate is inserted into the buckle body in a normal state in which the pretensioner does not operate, the first engagement portion is at the first position side end of the lock bar. The lock member is rotated to the lock position by contact, and the second engagement portion protrudes into the movement region of the lock bar. Therefore, the inertia force acting when the buckle body is suddenly stopped after the operation of the pretensioner is performed. Starts moving to the second position side, the lock bar can be received by the second engaging portion protruding into the movement area of the lock bar, and the movement of the lock bar to the second position can be suppressed. By doing so, it is possible to reliably prevent the tongue plate from coming off the buckle body. Others
An effect similar to the effect of the first aspect is obtained.

According to the buckle device of the fourth aspect, the lock member is rotatably supported by the frame via the pivot portion eccentric from the center of gravity, and when the buckle body is suddenly stopped after the pretensioner is operated, the lock member is locked. Since an inertial force rotating toward the lock position acts on the member, the lock bar that has started moving toward the second position can be reliably received by the second engagement portion.

According to the buckle device of the fifth aspect, the second engaging portion of the lock member generates a rotating force for rotating the lock member to the lock position side by contact with the lock bar moving to the second position side. Since the second engaging portion of the lock member does not completely intervene in the movement area of the lock bar, the lock bar that has started moving to the second position side in the second engaging portion is configured. Upon contact, the lock member can be reliably turned to the lock position. That is, the second engaging portion is completely interposed in the movement area of the lock bar,
The lock bar can be reliably received by the engagement portion.

[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 (when a tongue plate is inserted).

FIG. 6 is a longitudinal sectional side view of the buckle device (in a state where the insertion of the tongue frame is completed).

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

FIG. 8 is an enlarged view of a lock member and a lock bar.

DESCRIPTION OF SYMBOLS 1 buckle device 2 tongue plate 5 buckle main body 10 frame 20 hook member 30 lock bar 40 ejector 50 release button 60 lock member 61 base end portion 63 first engaging portion 64 second engaging portion 66 torsion Spring 70, 71 Coil spring

Claims (5)

[Claims] 1. A buckle device comprising: a tongue plate connected to a webbing; and a buckle body into which the tongue plate is inserted and removed. The buckle body includes a frame and a tongue rotatably provided on the frame. A hook member which is rotated when the plate is inserted to engage with the tongue plate and is always urged to rotate in the disengaging direction; a release button for releasing the engagement between the hook member and the tongue plate; The hook is moved by the urging force of the urging member to the first position for inhibiting the rotation of the hook member in the disengaging direction when the plate is in the engaged state, and is pushed by the release button when the release button is disengaged. A lock bar that moves to a second position that allows rotation of the member in the disengagement direction, and a lock position that locks the lock bar at the first position.
A lock member pivotally supported by the frame so as to be freely rotatable over an unlocked unlocked position, and an urging member for elastically urging the lock member to the unlocked position are provided. A base end portion pivotally supported, a first engagement portion formed at one end of the base end portion, and a second engagement portion facing the first engagement portion at an interval capable of receiving the lock bar, In a state where the lock member is located at the lock position, the first position side end of the lock bar abuts on the first engagement portion to maintain the lock position, and the second engagement portion protrudes into the movement region of the lock bar. A buckle device characterized by being close to and facing a lock bar. 2. The lock member according to claim 1, wherein a base end of the lock member is pivotally supported by the frame at a position away from a surface including a movement area of the lock bar on a side opposite to the hook member.
A buckle device according to item 1. 3. A tongue plate connected to the webbing, and a buckle main body into and from which the tongue plate is inserted and removed, and the buckle main body is 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 lock bar. The lock bar moves from a first position to a lock position that suppresses the movement of the lock bar to a second position, and a non-lock position that does not inhibit the lock bar. A lock member pivotally supported by the frame so as to be rotatable;
An urging member for elastically urging the lock member toward the unlock position is provided, the lock member includes a first engagement portion with which a first position side end of the lock bar can abut, and a lock member that locks when the lock bar is at the lock position. A second engaging portion that protrudes into the moving area of the bar and can abut on the second position side end of the lock bar, and is biased to the first position when the pretensioner is not operating and when it is operating. The lock bar is brought into contact with the first engagement portion to rotate the lock member to the lock position, and the lock bar, which has started to move to the second position side due to the inertial force generated when the buckle body suddenly stops after the pretensioner is actuated. A buckle device, wherein the buckle device is configured to be received by the second engagement portion and to prevent the lock bar from moving to the second position. 4. The lock member is rotatably supported by a frame via a pivot portion eccentric from its center of gravity, and when the buckle body is suddenly stopped after actuation of the pretensioner, the lock member is in the lock position side. The buckle device according to any one of claims 1 to 3, wherein the buckle device is configured to apply a rotating inertial force. 5. The lock member according to claim 2, wherein the second engagement portion of the lock member is configured to generate a rotating force for rotating the lock member toward the lock position by contact with a lock bar moving toward the second position. The buckle device according to any one of claims 1 to 4, characterized in that: