JP2001080456A - Buckle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut down the number of part items as much as possible, and to reduce to more extent assembly man-hour and cost. SOLUTION: A spring supporting part 2i for supporting one end of a button spring 10 is arranged on one side wall 2b of a base 2, thereby, a spring supporting member is no more required which stretches across both side walls as a conventional case. In this case, the button spring 10 is positioned such that it is off-centered from the center in the crosswise direction of an operating button 6 to one side edge side, therefore, the spring force of the button spring 10 essentrically acts on the operating button 6. Both the side walls 6b of the operating button 6 are guided to both the side walls 2a, 2b of the base 2, therefore even though the spring force of the button spring 10 eccentrically acts on the operating button 6, the operating button 6 can act smoothly. Thereby, the number of part items can be cut down, and assembly man-hour and cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a buckle used for a safety belt device such as a seat belt device mounted on a seat of an automobile or other transportation.

[0002]

2. Description of the Related Art At present, seat belt devices are mounted on seats of various transportation means such as automobiles to protect occupants in an emergency such as a collision. A buckle is usually provided for easily attaching and detaching this type of seat belt device, and the buckle generally biases a latch member provided with a jog portion for latching the tongue in a direction of latching the tongue. It is configured.

The buckle has an operation button for releasing the latch member from the latch state with the tongue. The operation button is normally held in a non-operation position by the spring force of the button spring, and is pushed in against the spring force of the button spring when the latch is released, so that the latch member is disengaged from the tongue. Has become. The button spring is disposed along the longitudinal direction on the center in the width direction of the buckle so that the spring force acts on the operation button. In this case, one end of the button spring is supported at the center in the width direction of the spring support member supported on the left and right side walls of the base having a U-shaped cross section that supports the latch member and the like.

[0004]

However, such a conventional buckle requires a spring supporting member for supporting one end of the button spring, which not only has a problem of increasing the number of parts but also has a problem. The number of assembly steps is large, and the cost is high. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a buckle capable of reducing the number of parts as much as possible and further reducing the number of assembly steps and costs.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a base having both side walls and rotatably supported on these side walls between a disengaged position and an engaged position. And a latch member that is urged toward the engagement position, rotates to the engagement position when the tongue is inserted into the predetermined position, and engages with the tongue, and the tongue in the engaged state and the latch member. In a buckle including at least an operation member for disengaging the latch member and an elastic member for urging the operation member to a non-operation position, an elastic member supporting the elastic member on at least one of both side walls of the base. A member support portion is provided, the elastic member is provided between the elastic member support portion and the operation member, and the operation member has both side walls, and both side walls of the operation member are Both of the bases It is characterized by being movable while being guided by the wall.

[0006]

In the buckle according to the present invention, the elastic member is supported by the elastic member supporting portion provided on one side wall of the base. Therefore,
The need for the spring supporting members bridged on both side walls as in the related art is eliminated, the number of parts is reduced, and the number of assembling steps and costs are reduced. In this case, since the elastic member is positioned eccentrically closer to one side edge from the center in the width direction of the operation member, the biasing force of the elastic member acts eccentrically on the operation member. However, since both side walls of the operation member are guided by the both side walls of the base, even if the biasing force of the elastic member acts eccentrically, the operation member operates smoothly.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an example of an embodiment of a buckle according to the present invention. FIG. 2 is a cross-sectional view showing the buckle of this example in a non-latched state with a tongue.
FIG. 3 is a cross-sectional view showing a latching state of the buckle of this example with a tongue, and FIG. 4 is a view showing a guide hole, a support groove, and a guide groove provided in a side wall of a base of this example. The right and left used in the following description represent right and left in the drawings.

As shown in FIGS. 1 to 4, a buckle 1 of this embodiment has a U-shaped buckle having both side walls 2a and 2b and a bottom 2c.
Base 2 composed of a character-shaped frame and both side walls 2 of base 2
a latch member 4 rotatably supported by the a tongue 3 and latchable by the tongue 3, and movably provided on both side walls 2a and 2b of the base 2 so that the latch member 4 is latched when the tongue 3 and the latch member 4 are latched. , A lock pin 5 for preventing movement of the base 2 in the latch release direction, an operation button 6 provided on both side walls 2a and 2b of the base 2 so as to be movable in the longitudinal direction, and a sliding portion in the longitudinal direction of the base 2 on the bottom 2c of the base 2. An ejector 7 movably provided and capable of urging the tongue away from the buckle 1, and a lock pin holding portion 8 for holding the lock pin 5
a slider 8, which is contracted between the slider 8 and the latch member 4, and constantly biases the slider 8 so that the lock pin 5 is pressed toward the latch member 4. A button spring 10 for constantly energizing the button 6, an ejector spring 11 for constantly energizing the ejector 7, and supported on both side walls 2 a and 2 b of the base 2 so as to be rotatable and movable in the longitudinal direction of the base 2,
An inertia lever member 12 for preventing the lock pin 5 from inertia moving to a release position of the latch when the tongue 3 and the latch member 4 are latched, and a spring holder fixedly supported on both side walls 2a and 2b of the base 2. 13, a lever spring 14 stretched between the inertial lever member 12 and the spring holder 13, an upper cover 15 and a lower cover 16 that cover the base 2 on which these components are assembled from above and below and engage with each other. It is composed of

On both side walls 2a and 2b of the base 2, supporting grooves 2d and 2e for rotatably supporting the rotating shafts 4a and 4b of the latch member 4, and both end portions 5a and 5 of the lock pin 5, respectively.
convex guide holes 2f and 2g for supporting and guiding b,
A guide rail 2 for guiding the ejector 7 in the longitudinal direction by slidably fitting the guide grooves 7a and 7b of the ejector 7.
h (the other one is provided symmetrically with respect to the longitudinal axis with respect to the guide rail 2h, but not shown), a spring support 2i provided on one side wall 2b and supporting one end of the button spring 10; A spring support portion 2j for supporting one end of the ejector spring 11 and the rotation shafts 12a and 12b of the inertia lever member 12 are supported rotatably and movably in the longitudinal direction. Guide grooves 2k and 2m for accommodating pressed portions 12c and 12d for returning the lever member 12 from the operating position to the non-operating position, and the mounting portion 13 of the spring holder 13.
a, 13b are fitted and detachably attached to the fittings 2n, 2o, and guides 2p, 2q for guiding the tongue 3 when the tongue 3 is inserted.

The support groove 2e formed in the side wall 2b has a convex shape.
The guide hole 2g and the guide groove 2m have the shapes shown in FIG.
It has been. That is, the support groove 2 e is
Shaft support 2e1 that rotatably supports rotating shafts 4a and 4b
have. In addition, the convex guide hole 2g is in the longitudinal direction.
Longitudinal hole 2g extending to₁And this longitudinal hole 2g₁
Vertical hole 2g extending in the vertical direction from the middle of_TwoAnd from
Has become. Longitudinal hole 2g₁The top of the left end of
As described above, the lock pin 5 is in the lock position (two points difference in FIG. 4).
When the lock pin 5 is in the upper position
Lock pin that prevents the upward movement of lock pin 5
Holder 2g_ThreeIt has become. In addition, the vertical hole 2g_Twoof
At the left end, the lock pin 5 is in the unlocked position as described later.
(The position indicated by the dashed line in FIG. 4) to the lock position.
When moving, or moving in the opposite direction.
Guide 2g for guiding the lock pin 5_FourHas become
You. This guide part 2g_FourIs the longitudinal hole 2g₁To the right
It is formed on an inclined surface that is inclined. Lock pin holder 2
g_ThreeAnd guide 2g_FourIs connected to an arc-shaped R part 2g _FiveWhen
This R part 2g_FiveIs the smallest possible diameter
Is desirable.

Further, the guide groove 2m is provided with the inertia lever member 1.
Rotating shaft support 2m ₁ supporting the two rotating shafts 12a, 12b
Lever member 1 between a non-operating position and an operating position
2, the opening 2m ₂ through which the pressed portion 12d can pass and the inertia lever member 1 as shown by the dashed line in FIG.
When 2 is inertial movement, the pressed portion 12d as shown in FIG. 4 by a two-dot chain line contact, consisted rotation preventing portion 2m ₃ Metropolitan to prevent rotation of the inoperative position the direction of the inertia lever member 12 ing.

Although not shown in FIG.
The support groove 2d, the guide hole 2f, and the guide groove 2k formed in the “a” are also formed in the same shape as the support groove 2e, the guide hole 2f, and the guide groove 2k, respectively. Although not used in the drawings, the longitudinal hole 2f ₁ , the vertical hole 2f ₂ , the lock pin suppressing portion 2f
_3, the guide portion 2f _4, and wherein the R portion 2f _5.

When the operation button 6 releases the latch between the tongue 3 and the buckle 1, the end opposite to the operation end of the operation button 6 comes into contact with the latch member 4. Release operation force support portions 4 d and 4 e for pressing the member 4 in the latch release direction, and a spring support portion 4 f for supporting one end of the slider spring 9 are further provided. The latch member 4 has a non-latch position not latched with the tongue 3 and a latch position latched with the tongue 3, with the pivot shafts 4 a and 4 b centered between the non-latch position and the latch position. Is rotatable.

The lower end of the lock pin 5 is always in contact with the upper surface of the latch member 4. The lock pin 5 is set by the spring force of the slider spring 9 and has the longitudinal holes 2f _{1 of the} convex guide holes 2f and 2g. , 2g ₁ , the locking position for locking the latch member 4 in the latched state when the tongue 3 and the latch member 4 are latched, and the convex guide hole 2f set by the release operation force of the operation button 6. 2g vertical hole 2
The above-mentioned non-lock position, which is located at f ₂ , 2g ₂ and sets the latch member 4 in the state of releasing the latch with the tongue 3, is set to the right of the lock position. The lock pin 5 has a substantially rectangular cross section or a substantially inverted trapezoidal shape with a short lower side. One of the corners 5a of the lock pin 5 has a convex shape in each of the guide portions 2 of the guide holes 2f and 2g.
f ₄ , 2g ₄ and the R portions 2f ₅ , 2g ₅ while constantly contacting them, and the upper surface 5b of the lock pin 5 is held down by the holding portions 2f ₃ , 2g.
in g ₃ is adapted to move while in contact with. Corner 5a
Is an R portion, and it is desirable that the diameter of the R portion is as small as possible.

The operation button 6 includes a flat plate portion 6a extending in the longitudinal direction and the width direction, and both side walls 6b formed on both side edges of the flat plate portion 6a by being bent from the flat plate portion 6a.
(The other one is provided similarly to the side wall 6b, but is not shown.)
Hereinafter, for convenience of explanation, reference numeral 6b indicates both side walls), and a spring supporting portion 6c which is provided eccentrically from the center in the width direction toward one side edge and supports the other end of the button spring 10.
It has. In this case, as shown in FIGS. 2 and 3, the operation button 6 has a substantially U-shaped cross section formed by the flat portion 6a and the side walls 6b.

Although not shown in FIGS. 1 to 3, the inertial lever member 12 is pressed inside the side walls 6 b of the operation button 6 by pressing the pressed portions 12 c and 12 d of the inertial lever member 12. An inertial lever member operating portion having an inclined surface is provided to rotate from the operating position to the non-operating position (schematically shown in FIG. 4 as an inertial lever member operating portion 6d). Similarly, although not shown in FIGS. 1 to 3, both ends of the lock pin 5 are pushed inside the side walls 6 b of the operation button 6 to move the lock pin 5 from the lock position to the non-furnace inner position. A lock pin operating portion made of a vertical surface to be moved is provided (also schematically shown as a lock pin operating portion 6e in FIG. 4).

In this example, when the operation button 6 is released from the latched state of the tongue 3 and the buckle 1 for the operation of releasing the latch and moves rightward, first, the inertia lever member operating portion 6d is driven by the inertia lever member 6d. The pressed portions 12c, 12d of the lever member 12 come into contact with the pressed portions 12c, 12d.
d to the inactive position of the inertial lever member 12,
Next, the lock pin operating portion 6e comes into contact with the lock pin 5 to move the lock pin 5 toward the unlocked position.

The ejector 7 is provided at the center in the width direction,
A projecting ridge 7c which makes a point contact when the bottom of the jog portion 4c of the latch member 4 comes into contact with the ejector spring 11;
And a spring support 7d for supporting the other end of the spring. The slider 8 further includes a spring supporting portion 8b that supports the other end of the slider spring 9.

The inertia lever member 12 constitutes a shock proof system that prevents the lock pin 5 and the operation button 6 from moving to the unlatched position due to inertia when the tongue 3 and the buckle 2 are latched. The inertial lever member 12 includes levers 12e and 12f, mass bodies 12g and 12h whose centers of gravity G are set at positions substantially orthogonal to the levers 12e and 12f, and a spring support portion 12i that supports one end of a lever spring 14. And further provided. In this case, the mass of the mass bodies 12g and 12h is changed by the moment around the rotation shafts 12a and 12b due to the inertial force acting on the center of gravity G of the mass bodies 12g and 12h due to the inertia. The inertia lever member operating portion 6d is configured such that the pressed portions 12c, 1 of the inertial lever member 12
It is set to be larger than the moment around the rotation shafts 12a and 12b due to the force pushing up the inertial lever member 12 toward the inoperative position of the inertial lever member 12.

The spring holder 13 further includes a spring support 13c for supporting the other end of the lever spring 14. Of these components, the operation button 6, the ejector 7, the slider 8, the spring holder 13, the upper cover 15, and the lower cover 16 are each made of resin, and the remaining other components and the engaging portions 3b of the tongue 3 Are all made of metal. Furthermore,
A well-known buckle pretensioner (not shown) is connected to the base 2 of the buckle 1. The buckle pretensioner operates in an emergency such as a vehicle collision to rapidly pull the base 2 rightward. The occupant is quickly restrained by the seat belt.

Next, the operation of latching the buckle 1 with the tongue 3 and the operation of preventing the inertia from being released by the shock proof system including the inertial lever member 12 will be described. FIGS. 5A and 5B illustrate the latch operation of the buckle with the tongue and the inertia loss prevention operation in the latch state in this example. FIG. 5A illustrates a non-latched state in which the tongue is not latched, and FIG. FIG. 3C is a diagram illustrating a latched state, FIG. 3C is a diagram illustrating a state when a buckle is pulled by a buckle pretensioner, and FIG. 3D is a diagram illustrating a state when a buckle is pretensioned by a buckle pretensioner. It is. For convenience of explanation of the operation, FIG. 5 shows an irregular cross section, and some components not directly related to the explanation are partially omitted.

The buckle 1 is not latched when the tongue 3 is not latched.
In the latch state, as shown in FIG. 2 and FIG.
The ejector 7 is at the left limit by the spring force of the ejector spring 11
Set to position. In this leftmost position of the ejector 7,
The ejector 7 pushes the jog portion 4c of the latch member 4 upward.
Push up, bottom 4c of jog 4c of latch member 4 ₁
Is almost point-contact on the ridge 7c on the upper surface of the ejector 7.
State. In this state, the latch member 4
Non-latch that does not latch with the tongue 3
Is set to the switch position. At this time, the lock pin 5
Abuts on the upper surface of the latch member 4 and is
Up and down the convex guide holes 2f and 2g.
Direction hole 2f_Two, 2g_TwoIs set to the unlock position.
Further, when the buckle 1 is in the unlatched state, the inertia lever member
12 levers 12e and 12f rest on the lock pin 5.
The lock pin 5 is not locked.
The inertia lever member 12 is pushed up to the
The levers 12e and 12f are not shown by dotted lines in FIG.
It is set to be in the operating position. Also revers
Pulled to the right by the spring force of the spring 14
The rotation axes 12a and 12b of the inertial lever member 12 are 2 m
1 is in a state of contact.

When the tongue 3 is inserted through the tongue insertion opening 1a at the left end of the buckle 1 from the non-latched state of the buckle 1 shown in FIGS. 2 and 5A, the right end of the tongue 3 becomes the left end of the ejector 7. , And the ejector 7 is pressed rightward. Then, the ejector 7 moves to the right while reducing the ejector spring 11 in accordance with the insertion of the tongue, so that the jog portion 4c of the latch member 4 that has been placed on the ridge 7c of the ejector 7 comes off from the ejector 7. Then, the lock pin 5 is pressed downward via the slider 8 by the spring force of the slider spring 9,
Since the lock pin 5 presses the jog portion 4c of the latch member 4, the latch member 4 rotates counterclockwise in the figure around the rotation shafts 4a and 4b. Therefore, the jog portion 4c of the latch member 4 enters the moving passage of the tongue 3 and fits into the locking hole 3a of the tongue 3, so that the latch member 4 is at the latch position. When the insertion force of the tongue 3 is released, the ejector 7 presses the right end of the tongue 3 by the spring force of the ejector spring 11, and the right end of the locking hole 3a of the tongue 3 engages with the jog 4c to engage the tongue 3. Are latched by the buckle 1, and the tongue 3 and the buckle 1 enter the latch state shown in FIGS. 3 and 5B.

At this time, the spring force of the slider spring 9
As a result, the lock pin 5 becomes the guide portion 2g of the inclined surface._FourGuide to
2g vertical hole_TwoAfter moving down the longitudinal direction
Hole 2g ₁And move to the left to reach the lock position. This
In the lock position of the lock pin 5, the upper surface of the lock pin 5
But 2g_ThreeCan be restrained from above by
The upward movement of the cupin 5 is prevented. This allows the lock
Since the pin 5 holds the latch member 4 in the latch position,
The latch member 4 does not come out of the locking hole 3a of the tongue 3.
And the latch between the tongue 3 and the buckle 1 is securely held.
It is.

Further, when the tongue 3 and the buckle 1 are latched, the spring support 12i of the inertial lever member 12 is pulled by the spring force of the lever spring 14, so that the inertial lever member 12 is 2m ₁ to supported rotation shaft 12a, rotates counterclockwise around the 12b. For this reason, as shown in FIG.
e, 12f are located on the movement path of the lock pin 5 to the unlocked position, and the pressed parts 12c, 12d
Is a position that can pass through the openings 2k ₂ and 2m ₂ ,
The inertia lever member 12 is in the operating position. In the operating position of the inertial lever member 12, even if the lock pin 5 attempts to move to the unlocked position, it comes into contact with the levers 12e and 12f, so that the lock pin 5 is prevented from moving to the unlocked position. Thus, the tongue 3 is securely latched to the buckle 1, and the buckle 1 and the tongue 3 are reliably prevented from being dissociated.

When the operation button 6 is pushed rightward to release the latch between the tongue 3 and the buckle 1, the operation button 6
Moves to the right, and as described above, the inertial lever member operating portion 6 d first moves the pressed portion 12 of the inertial lever member 12.
c, 12d are pushed up to the inoperative position, so that the inertia lever member 12 has the pressed portions 12c, 12d having the openings 2k ₂ ,
It rotates clockwise around the rotation shafts 12a and 12b so as to pass through 2 m ₂ . For this reason, the levers 12e, 1
The tip of 2f moves above the longitudinal movement passage of the lock pin 5.

In this state, when the operation button 6 is further moved rightward, the lock pin operating section 6e moves the lock pin 5 rightward. When the lock pin 5 comes to movable position vertically hole 2 g _2, the lock pin 5 is no longer suppressed by the suppressing portion 2 g _3, the latch member 4 pivot shaft 4
It becomes possible to rotate clockwise around a and 4b. At this time, the lock pin 5 is located immediately below the levers 12e and 12f. By the lock pin 5 it can not be suppressed by suppressing portion 2 g _3, and an ejector spring 1
Since the ejector 7 is urged in the latch release direction by the spring force of 1, the ejector 7 flips the latch member 4 upward, and the latch member 4 rotates clockwise about the rotation shafts 4a and 4b, The jog part 4c is the locking hole 3 of the tongue 3.
Simultaneously with the escape from a, the tongue 3 is pushed out to the left. At this time, the lock pin 5 is
With the clockwise rotation of, the latch member 4 pushes up and enters the vertical holes 2f and 2g. Further, since the lock pin 5 pushes up the levers 12e and 12f, the inertia lever 12 rotates clockwise around the rotation shafts 12a and 12b.

[0028] Then, placed bottom 4c ₁ of the joggle portion 4c of the latch member 4 in the protrusion 7c of the ejector 7, finally, becomes ejector 7 is a left limit position, also the latch member 4
Is in the non-latch position, the lock pin 5 is in the unlock position, the inertia lever member 12 is in the non-operation position, and the buckle 1 is disengaged from the tongue 3 in FIGS.
The non-latched state shown in FIG.

Next, the operation of the shock proof system including the inertial lever member 12 will be described. The buckle 1 shown in FIG. 3 and FIG.
When the buckle pretensioner is operated in an emergency such as a vehicle collision in a latch state between the base 2 and the tongue 3, the base 2
Is quickly pulled to the right. For this reason, a very large rightward acceleration acts on the buckle 1 and the buckle 1
Receives a large leftward inertial force. At this time, the inertial lever member 12 is in a state where it can move leftward and rotate clockwise. Therefore, while the buckle 1 is being retracted by the buckle pretensioner,
As shown in FIG. 5C, only the inertial lever member 12 moves leftward due to the inertial force acting on its center of gravity G, and the pressed portions 12c and 12d of the inertial lever member 12 immediately turn to the rotation preventing portion 2m _3. Will be located below. At this time, mass 12g, but the inertia lever member 12 by inertia force acting on the center of gravity G of 12h is to rotate in a clockwise direction, the pressed portion 12c, the tip of 12d per the rotation preventing portion 2m _3, this the rotation is prevented by the rotation preventing portion 2m _3.

In this state, when the buckle pretensioner reaches the bottom due to the end of the buckle retraction, a large inertia force acts in the opposite direction (ie, to the right) when the buckle 1 is being retracted. Therefore, the inertia lever member 12 as shown in FIG. 5 (d) is moved to the right, the rotation shaft 12a, 12b is abutted supported again the rotation shaft support portion 2m _1. In this state, the operation button 6 also moves rightward due to the inertial force, and the inertia lever member operating portion 6d moves the pressed portion 1
The pressed portions 12c and 12d are pressed obliquely upward on the inclined surfaces of the pressed portions 12c and 12d. For this reason, the moment of trying to rotate the inertial lever member 12 clockwise is generated by the inertial force of the operation button 6. However, at the same time, an inertia force acting on the center of gravity G of the mass bodies 12g and 12h also generates a moment for rotating the inertial lever member 12 counterclockwise, but as described above, Since the counterclockwise moment due to the inertia force of 12h is set to be larger than the clockwise moment due to the inertia force of the operation button 6, the inertia lever member 12 does not rotate, and the lever 12 does not rotate.
The e and 12f are prevented from falling out of the longitudinal movement passage of the lock pin 5 when the bottom strikes. Therefore, even if the lock pin 5 attempts to move to the right, that is, to the unlocked position due to the inertia force at the time of the bottom strike, the lock pin 5 is moved to the lever 12e, 1
Movement to the unlocked position by contacting the tip of 2f is prevented. Thus, the inertia of the tongue 3 due to the operation of the buckle pretensioner is prevented, and the latch between the tongue 3 and the buckle 1 is securely and firmly held.

By the way, in the buckle 1 of this embodiment, the spring supporting portion 2i for supporting one end of the button spring 10 is provided on the side wall 2b on one side of the base 2 as described above. The need for a spring support member spanning the wall is eliminated. Therefore, according to the buckle 1 of this example, the number of parts can be reduced, and the number of assembly steps and cost can be reduced. In this case, since the button spring 10 is positioned eccentrically closer to one side edge from the center in the width direction of the operation button 6, the spring force of the button spring 10 acts eccentrically on the operation button 6. . However, since the side walls 6b of the operation button 6 are guided by the side walls 2a, 2b of the base 2, even if the spring force of the button spring 10 acts eccentrically, the operation button 6 operates smoothly. The spring supporting portion 2i can be provided on the other side wall 2a, or can be provided on both side walls 2a and 2b.

[0032]

As is apparent from the above description, according to the buckle of the present invention, the elastic member is supported by the elastic member supporting portion provided on at least one of the side walls of the base. As described above, the spring supporting members bridged on both side walls can be eliminated. Therefore, the number of parts can be reduced, and the number of assembly steps and cost can be reduced. In this case, the biasing force of the elastic member acts eccentrically on the operating member. However, since the side walls of the operating member are guided to the side walls of the base, the biasing force of the elastic member acts eccentrically. Even so, the operation member can be operated smoothly.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing the buckle of this example in a non-latched state with a tongue.

FIG. 3 is a cross-sectional view showing a state in which the buckle of this example is latched with a tongue.

FIG. 4 is a view showing a guide hole, a support groove, and a guide groove provided in a side wall of a base according to this embodiment.

5A and 5B illustrate a latch operation of the buckle with a tongue and an inertia loss prevention operation in a latch state according to this embodiment.
Is a diagram showing a non-latched state where the tongue is not latched,
(B) is a diagram showing a latch state in which the tongue is latched by the buckle, (c) is a diagram showing a state where the buckle is pulled by the buckle pretensioner, and (d) is a diagram showing the state of pulling the buckle by the buckle pretensioner. It is a figure which shows the state at the time of bottom striking.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Buckle, 2 ... Base, 2a, 2b ... Side wall, 2c ...
Bottom, 2d, 2e: Support groove, 2f, 2g: Guide hole, 2i
... Spring support parts, 2k, 2m ... Guide grooves, 3 ... Tungs, 3a ... Lock holes, 4 ... Latch members, 4a, 4b ... Rotating shafts, 4c ... Jog parts, 5 ... Lock pins, 6 ... Operation buttons, 6a: plate-like portion, 6b: side wall, 6c: spring support portion, 6d: inertia lever member operating portion, 6e: lock pin operating portion, 7: ejector, 8: slider, 9: slider spring, 10: button spring, 11 ... Ejector spring, 12 ... Inertial lever member, 12a, 12b
... Rotating shafts, 12c, 12d ... Pressed parts, 12e, 12f ...
Lever, 14: lever spring, 15: upper cover, 16: lower cover, 16a: lower cover 16 part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihiko Kawai 1-4-30 Roppongi, Minato-ku, Tokyo Inside Takata Corporation (72) Inventor Tadayuki Asako 1-4-30 Roppongi, Minato-ku, Tokyo Takata Corporation (72) Inventor Takaaki Kimura 1-4-3 Roppongi, Minato-ku, Tokyo Takata Co., Ltd. F-term (reference) 3D018 BA12

Claims (1)

[Claims] 1. A base having both side walls, supported on these side walls so as to be rotatable between a non-engagement position and an engagement position, and urged toward the engagement position to set a tongue. A latch member that rotates to the engagement position when inserted into the engagement position and engages with the tongue; an operating member for disengaging the engaged tongue and the latch member; A buckle including at least an elastic member biasing to an operation position, wherein at least one of both side walls of the base is provided with an elastic member supporting portion for supporting the elastic member, and the elastic member supports the elastic member. The operating member has both side walls, and both side walls of the operating member are movable by being guided by both side walls of the base. Feature Buckle.