JP2001270418A - Air belt device and buckle for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buckle for an air belt device which is simply and compactly structured and the air belt device which is provided with this buckle. SOLUTION: A locking tool 100 of an air belt device 21 is provided with a tongue 33 and a buckle 35. An inflator 39 is connected to the lower part of the buckle 35 by screws. An anchor bracket 37 is mounted on the lower end of the inflator 39. The buckle 35 is simply and compactly structured by using the inflator 39 as a connecting member to the car body. As a result, the number of parts is reduced and the structure is simplified so as to simplify the manufacturing load and assembly and reducing the cost and the weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air belt device having an inflatable bag at a portion in contact with an occupant's shoulder or chest and restraining the occupant to a seat in an emergency. Further, the present invention relates to a buckle for the air belt device.

[0002]

2. Description of the Related Art At present, as a device for restraining an occupant of an automobile to a seat in an emergency such as a collision, a seat belt device is mainly used. A typical seat belt device is
It has shoulder webbing that extends from the occupant's shoulders to the waist under the chest through the front of the chest, and wrap webbing (both in series) that crosses the front of the waist. The proximal end of the shoulder webbing is connected to a seat belt retractor. The retractor locks the shoulder webbing drawer when abnormal deceleration is applied to the vehicle, and the locked shoulder webbing prevents the occupant from moving forward.

In recent years, the following technical improvements have been added to the seat belt device in order to further improve the occupant protection function. A pretensioner that quickly removes the slack of the webbing in an emergency and initially restrains the occupant. When the webbing tension reaches a predetermined value, the webbing is gradually fed out to absorb the occupant's inertial energy.
Absorbing mechanism (hereinafter referred to as EA mechanism) There is also a basic need to lower the pressure between the occupant's shoulders and chest and the webbing to give the occupant softer protection.

[0004] The air belt device was born in view of the above-mentioned technical trends and demands for seat belts. That is,
The air belt device is a device in which a portion of the shoulder webbing of a seat belt that touches a shoulder or a chest of a human body is an emergency inflatable bag. The bag shrinks in the longitudinal direction when inflated, so that the slack of the webbing can be removed and also acts as a seat belt pretensioner. Further, since the bag is inflated, for example, to a diameter of about 14 cm and acts as an air cushion, the pressure applied to the occupant's body becomes softer. Further, an EA mechanism can be realized by gradually evacuating the gas in the bag at an appropriate timing. As described above, the air belt device is expected to be widely used in the near future as a device capable of further improving the safety performance of the currently mainstream seat belt device.

[0005] By the way, the locking device for connecting the seat belt device and the vehicle body generally comprises a buckle connected to the vehicle body (seat frame or the like) and a tongue connected to the end of the air belt. The buckle is provided with a tongue locking mechanism for detachably engaging the tongue.
The inflator for inflating the bag of the air belt device includes a type provided at an upper portion of the bag (above the occupant's shoulder) and a type provided at a lower portion of the bag (under the occupant's waist). As a type provided at the lower part of the bag, there is a type in which gas generated from an inflator is supplied into the bag via a buckle.

In the air belt device disclosed in Japanese Patent Application Laid-Open No. H11-268610, an inflator is attached to a lower portion of a buckle main body (buckle housing). A gas passage is formed in the buckle housing. The gas from the inflator passes through the gas passage and is supplied into the bag via the gas passage of the tongue. On the other hand, an anchor member is provided at the lower end of the buckle housing. The anchor member is swingably supported on the seat base of the vehicle body by pins and bolts.

[0007]

SUMMARY OF THE INVENTION The above-mentioned JP-A-11-26
In the air belt device disclosed in 8610, the inflator and the anchor member are separately fixed to the buckle housing. More specifically, the inflator is fixed to project laterally from the lower portion of the buckle housing, and the anchor member is fixed to project downward from the lower portion of the buckle housing. Therefore, the structure of the buckle is complicated, or the entire buckle becomes large. If the structure of the buckle is complicated, the manufacturing process is also complicated, which leads to an increase in cost. If the buckle is large,
Weight increases. Also, a space for placing a large buckle must be secured.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a buckle for an air belt device having a simple and compact structure. It is another object of the present invention to provide an air belt device having such a buckle.

[0009]

Means for Solving the Problems and Embodiments of the Invention In order to solve the above-mentioned problems, an air belt device of the present invention comprises:
What is claimed is: 1. An air belt device comprising an inflatable air belt at a portion in contact with an occupant's body, comprising: a locking member for removably locking an end portion of the air belt to a vehicle body; and an inflator for expanding the air belt. , Characterized by being a strength member of the locking device.

The strength member between the locking member and the vehicle body can also serve as the inflator, so that the number of parts can be reduced and the structure can be simplified. For this reason, the manufacturing process and assembly are simplified, and the cost can be reduced. Further, since the buckle can be made compact, the weight can be reduced. Alternatively, the space for arranging the buckle is small.

An air belt device according to a specific embodiment of the present invention comprises:
A buckle connected to a vehicle body (including a seat frame or the like); and a tongue connected to an end of the air belt, wherein the buckle is connected to the vehicle body via an inflator. As compared with the conventional structure in which the inflator protrudes in the lateral direction of the buckle, the configuration of the locking member is more compact.

A buckle according to a first aspect of the present invention is a buckle including: a tongue locking mechanism; a passage for passing an air belt inflation gas; and a connecting member for connecting the inflator to generate the gas. A pulling force applied to the mechanism is applied to the inflator via the connection member. By using the inflator as a strength member for retaining the buckle, parts can be reduced.

In the buckle according to the first aspect of the present invention,
The tongue locking mechanism includes: a latch for holding a tongue plate; and a buckle base for swingably holding the latch. The inflator connection member includes an outer shape locking portion for a buckle base, and a gas for the inflator. And an internal thread into which the ejection tube is screwed. In this case, there is an advantage that the buckle base and the inflator connection member can be firmly connected. Alternatively, the inflator connecting member and the gas ejection pipe of the inflator may be fixed by caulking.

A buckle according to a second aspect of the present invention is a buckle including: a tongue locking mechanism; a passage for passing an air belt inflation gas; and a connecting member for connecting to an inflator for generating the gas; It is characterized by being arranged substantially at the center in the buckle width direction (tang width direction). Even when the tongue and the buckle are offset (when the tongue is tilted), there is not much gap between the buckle and the tongue at the center, so gas leakage can be suppressed.

A description will be given below with reference to the drawings. In addition,
In the following description, the up, down, left, and right directions indicate the up, down, left, and right in each figure. FIG. 1 is a schematic perspective view showing an overall configuration of an air belt device according to one embodiment of the present invention and a state when a bag is deployed. In the figure, the occupant 11 is shown in a state of sitting on the seat 1. Seat 1 is occupant 1
1 includes a seat cushion 5 for sitting, a seat back 3 as a backrest, and the like. Under the seat cushion 5, there is a seat frame 7 that supports the seat 1 and is connected to the vehicle body.

The air belt device 21 includes the following components. 1. An air belt 31 that extends obliquely from the shoulder of the occupant 11 to the chest and waist when the belt is worn, and expands in an emergency. 2. A shoulder that is connected to the upper end of the air belt 31 and that is a belt-like fabric similar to webbing in a normal seat belt. Webbing 25 3. Deflector 27 for deflecting shoulder webbing 25 4. Retractor 23 for winding shoulder webbing 25 and locking drawer in an emergency

5. Tongue 33 connected to the lower end of air belt 31 for locking air belt 31 to the vehicle body via buckle 35 6. Buckle fixed to seat frame 7 via inflator 39 and anchor bracket 37 35 7. Inflator 39 for generating gas for inflating air belt 31 8. Wrap webbing 41 extending to the occupant's waist 9. Retractor 43 for winding up the base end of wrap webbing 41 and locking it in an emergency 10. Not shown But in an emergency, the inflator 3
Sensor and electric circuit for operating the motor 9

A feature of the air belt device 21 is that the buckle 35 is connected to the seat frame 7 via an inflator 39, and the inflator 39 also serves as a strength member of the buckle 35. That is, the pulling force of the air belt 31 is borne by the inflator 39 via the buckle 35.

FIG. 2 is a front view showing the structure of the locking member of the air belt device of the present embodiment. FIG. 3 is a side sectional view showing the configuration of the locking device. FIG. 4 is a view of the locking device with the buckle cover removed and viewed from the back side. FIG.
FIG. 4 is an enlarged view of FIG. 5 and shows a state where a tongue is locked to a buckle. FIG. 6 is an enlarged sectional view of the buckle with the tongue removed.

FIG. 7 is a view showing a base which is a main part of the buckle according to the present invention, wherein (A) is a front view and (B).
Is a side view, and (C) is a plan view. FIG. 8 is a view showing a connection member (duct) which is a main component of the buckle.
(A) is a sectional view, and (B) is a perspective view. FIG. 9 is a view showing an ejector which is a main part of the buckle.
(A) is a front view, (B) is a perspective view. FIG. 10 is a cross-sectional view showing a connection state of an air belt, a tongue, and an upper portion of a buckle of the air belt device of the present embodiment. FIG. 11 is an enlarged front view of a connection portion between the tongue and the air belt. FIG.
FIG. 4 is a cross-sectional view showing another example of a connection portion between the inflator connection member (duct) and the inflator.

As best shown in FIGS. 2 and 3, the locking device 100 of the air belt device 21 includes a tongue 33 and a buckle 35. An inflator 39 is screwed to a lower portion of the buckle 35. An anchor bracket 37 is provided at a lower end of the inflator 39.

First, the buckle 35 will be described mainly with reference to FIGS. As best shown in FIGS. 5 and 6, the buckle 35 includes a cover 101. An upper opening 35d for inserting the tongue plate 33a is provided in an upper portion of the cover 101. Inside the cover 101, a tongue locking mechanism 110 for locking the inserted tongue plate 33a is provided. On an upper part of the cover 101, a release button 35a is provided. When the button 35a is pressed down, the tongue locking mechanism 110 is released, and the tongue 35 comes out upward. The basic configuration of the tongue locking mechanism 110 of the buckle 35 is the same as that of the current mass-produced product.

The tongue locking mechanism 110 has a buckle base 111 made of steel. The buckle base 111 is
It is a member that is a main strength member against the pulling force of the air belt 31. The buckle base 111 includes a substrate 113 and two side plates 115 as shown in FIG.
(See FIG. 7C).
As shown in FIG. 7A, two parallel slits 113a are formed in the substrate 113. This slit 1
A protrusion 165 of an ejector to be described later is engaged with 13a.
Slide. A notch 113b is formed below the substrate 113. Two projections 1 are provided inside the notch 113b.
13c is formed. The notch portion 113b is engaged with a contour locking portion 175 of an inflator connection member described later.

The substrate 113 has screw holes 113d and 113d.
e is open. A screw 114 (see FIGS. 4 to 6 and the like) for fixing a pipe described later is provided in the screw hole 113d.
Is screwed. A screw 116 (see FIGS. 4 to 6 and the like) for fixing an inflator connection member described later is screwed into the screw hole 113e.

As shown in FIG. 7B, a latch fulcrum hole 121, a latch swing hole 123, and the like are formed in both side plates 115 of the buckle base 111. Latch fulcrum hole 1
21 has a fulcrum portion 1 of a latch to be described later.
33 are engaged, and serve as pivots of the latch. A claw 123 a is formed at a part of the inner edge of the latch swing hole 123. When the latch is not engaged (the state shown in FIG. 6), the claw 123a is opened by the window (reference numeral 135 in FIG. 4) of the swinging portion 135 of the latch.
a).

As shown in FIG. 4 to FIG. 6, a latch 131 is provided between both side plates 115 of the buckle base 111.
Is held. The latch 131 is a member that presses the tongue plate 33a when the tongue 33 is engaged. The latch 131 has a fulcrum 133 that engages with the latch fulcrum hole 121 of the side plate 115 of the buckle base 111, and a swing portion 135 that is disposed in the latch swing hole 123.

As shown in FIG. 4, the fulcrum 133 of the latch 131 has a protruding end 133a that protrudes laterally. The protruding end portion 133a is formed at the upper end edge 121a of the latch fulcrum hole 121 of the buckle base side plate 115 shown in FIG.
, And serves as a swing fulcrum of the latch 131. Latch 13
As shown in FIG. 4, the right and left windows 1 are
35a is opened. This window 135a is
When the tongue 5 is engaged (the state shown in FIG. 5), the slider 5 is closed by a slider described later, and when the tongue 35 is not engaged (the state shown in FIG. 6), it is released. In this open state, the claws 123a of the latch swing holes 123 of the both side plates 115 enter the windows 135a.

A tongue engaging projection 137 is formed on the rear surface of the latch 131 (the right surface in FIGS. 5 and 6). When the tongue 35 is engaged (the state shown in FIG. 5), the engagement protrusion 137 engages with a tongue plate 33 described later. The upper part of the latch engagement protrusion 137 has a taper 13
7a are formed. In addition, at the top of the latch,
A spring hook 138 is formed. A spring 104 for connecting and biasing the latch 131 and a slider described later is attached to the spring hook 138. The latch 131 and the release button 35a are connected and urged by the button spring 107. The button spring 107
And the engagement state between the latch 131 and the release button 35a are schematically represented. By the button spring 107, the release button 35a is urged in the downward direction, and the latch 131 is urged in the upright direction.

As shown in FIG. 5 and FIG.
5 (left side in FIGS. 5 and 6), the slider 1
41 are slidably held together. Same slider 14
1 is provided with an overhang portion 143 that overhangs the lateral side. The overhang portion 143 is disposed in the latch swing hole 123 of the buckle base 111. When the tongue 35 is engaged (the state shown in FIG. 5), the overhang portion 143 opens the window 1 of the latch 131.
When the tongue 35 is disengaged (the state shown in FIG. 6), the window 35a of the latch 131 is located below the window 135a and the window is opened. A spring hook 145 is formed substantially at the center of the slider 141. This spring hook 145
The spring 10 is located between the
4 is attached. The spring 141 urges the slider 141 upward (at a position that closes the window 135a). At the upper end of the slider 141, a hook-shaped contact portion 14 is provided.
7 are formed. The contact portion 147 is provided with a tongue 35
At the time of engagement (the state shown in FIG. 5), the inside of the press button 35a is hit.

As shown in FIGS. 4 to 6, an ejector 161 is held inside the buckle base 111 so as to be slidable in the vertical direction. This ejector 161
Is a semi-elliptical recess 16 as shown in FIG.
3 The recess 163 is formed to be larger than the outer periphery of a pipe 181 described later. Two protrusions 165 are formed on the opening edge of the recess 163. These projections 165 are slidably engaged with the slits 113a of the buckle base 111, as shown in FIG. An arc-shaped contact portion 167 is formed on the surface of the ejector 161 opposite to the protrusion 165 (the left surface in FIGS. 5 and 6 and the upper surface in FIG. 9B). This contact portion 167
At the time of engagement of the tongue 35, the lower end edge of the tongue plate 35a. 9 is provided on the lower surface of the ejector 161.
As shown in (A), a spring hole 169 is formed to engage with an upper end of a spring 108 described later.

As shown in FIGS. 5 and 6, a base substrate 113 is provided substantially at the center of the inside of the buckle base 111.
The pipe 181 is located between the recess 163 of the ejector 161 and the
Is arranged. The pipe 181 is screwed
The buckle base 111 is fixed to the substrate 113.
The pipe 181 is connected from the inflator 39 to the airbag 3.
1 is a passage through which the gas discharged into 1 passes.

The upper end of the pipe 181 is covered with a buckle cap 103. With the same cap 103,
The upper end of the pipe 181 is normally closed, but the cap 103 is broken by the gas pressure released from the inflator 39. The buckle cap 103 is urged upward by a spring 185 fitted on the pipe 181. Due to the urging force of the spring 185, the tongue 35
At the time of engagement (the state of FIG. 5), the upper end of the pipe 181 and the lower end of the gas blowing pipe 33d of the tongue described later are tightly connected. The upper end of the inflator 39 is connected to the lower end of the pipe 181 via an O-ring 189.

As shown in FIG. 5 and FIG.
And the buckle base 1 on the lower side of the slider 141.
A holder 151 is attached to the inside of 11. A protrusion 155 is formed upward on the right side of the holder 151 (the right side in FIGS. 5 and 6). This projection 1
A spring 108 is externally fitted to 55. Same spring 108
Is engaged with a spring hole 169 on the lower surface of the ejector 161. The ejector 161 is pushed upward by the urging force of the spring 108, and when the tongue 35 is not engaged (the state shown in FIG. 6), the ejector 161 is pushed upward.

Near the left end of the holder 151 (the left side in FIGS. 5 and 6), two guide columns 153 are formed so as to stand up. Along this guide column 153,
A guide hole (not shown) in the press button 35a slides. Each of these guide columns 153 has a spring 10
6 is externally fitted. The upper end of the spring 106 contacts the lower surface of the press button 35a. The press button 35a is pushed upward by the urging force of the spring 106.

As shown in FIGS. 5 and 6, the holder 151
The inflator connection member (duct) 171 is attached to the buckle base 111 at a lower portion of the buckle base 111. As shown in FIG. 8, the duct 171 has a through hole 173 that penetrates vertically. This through hole 17
3 is provided with an internal thread 171a (FIGS. 5 and 6).
(See). The female screw 171a has an external thread 39a at the upper end of the inflator 39 (see FIGS. 5 and 6).
Is screwed. In addition, as shown in FIG.
The 71 and the upper end of the inflator 39 may be fixed by caulking. In this case, as shown in FIG. 12A, a constricted portion 39e is formed at the upper end of the inflator 39. The internal thread 171a of the duct 171 and the external thread 39a of the upper end of the inflator 39 need not be formed. When the duct 171 is swaged from the outside and is inserted into the constricted portion 39e, the duct 171 and the upper end of the inflator 39 are fixed.

On the side end surface of the duct 171 (the left front surface in FIG. 8B), an outer shape locking portion 175 is formed.
The external locking portion 175 is in the shape of a drum having a constricted portion 175a, and engages with the cutout portion 113b (see FIG. 7A) of the substrate 113 of the buckle base 111. On this occasion,
The board notch 113b enters the constricted portion 175a of the duct external locking portion 175, and the duct 171 and the buckle base 111 are firmly connected in the vertical direction. The pull-out force applied to the tongue is applied to the duct 171,
It is transmitted to the inflator 39.

Screw holes 177 are formed on both sides of the outer shape locking portion 175 of the duct 171. Duct 17
In the state where the first external locking portion 175 is engaged with the cutout portion 113b of the board 113, the screw 116 is inserted into the screw hole 113e of the board 113 and the screw hole 177 of the duct 171 (see FIGS. 5 and 6).
Is screwed. Thus, the duct 171 is fixed to the buckle base 111. At the lower end of the duct 171,
A flange portion 179 is provided. This flange 1
Reference numeral 71 serves as a guide when the inflator 39 is screwed into the duct 171.

Next, the inflator 39 will be described. As shown in FIGS. 5 and 6, the lower end of the pipe 181 of the buckle 35 is connected to the inflator 3 via a duct 171.
Nine upper ends are connected. When the inflator 39 is ignited at the time of a vehicle collision, the inflator 39 blows out a bag deployment gas toward the gas passage 35 c of the buckle 35. The gas also:
The gas is blown into the hollow portion of the bag from the gas blowing pipe 33d of the tongue 33 (see FIG. 10) through the inside of the pipe 181.

The upper end of the inflator 39 is tapered, and a screw 39a is cut on the outer periphery. The male screw 39a is screwed into the female screw 171a of the duct 171. Inside the inflator 39, as shown in FIG.
A propellant 39c and an initiator 39d are incorporated. An anchor bracket 37 is provided at a lower end of the inflator 39. The bracket 37 is fixed to a seat frame or the like with bolts or the like. In this example, the anchor bracket 37 is formed integrally with the body of the inflator 39, but they may be connected separately by bolts, clamps, or the like.

The buckle 35 of this embodiment has the inflator 39 as a connecting member to the vehicle body.
It has a simple and compact structure. Since the number of parts is reduced and the structure is simple, the manufacturing process and assembly are simplified, and the cost can be reduced. In addition, the weight is reduced.

Next, the tongue 33 will be described. FIG.
As clearly shown in FIG. 0 and FIG.
It has a tongue plate 33a inserted into the buckle 35, a gas blowing pipe 33d, a hook part 33c, and the like. The tongue plate 33a engages with the latch 131 of the tongue locking mechanism 110 in the buckle 35. Gas injection pipe 33
d is provided at the center of the tongue 35. A gas blow-in port 77 of a bag described later is connected to the upper end side of the gas blow-in pipe 33d. In the gas blowing pipe 33d,
A gas passage 33b is formed. This gas passage 33b
Communicates with the inside of the bag 53. Gas injection pipe 33
A tongue cap 34 is fitted in the lower end side opening of d. The tongue cap 34 is broken by the gas ejected from the inflator 39. The hook 33c is provided with a slit 33e. A lap webbing 41 described later is inserted into the slit 33e. The connection between the tongue 33 and the air belt 31 will be described later.

Next, the air belt 31 will be described. As shown in FIG. 10, the air belt 31 includes three layers of a bag 53, a mesh webbing 51, and a cover 81 from the inside to the outside. The bag 53 is formed by bonding (adhering and sewing) a plain weave made of, for example, nylon coated with a silicone resin in a bag shape. The mesh webbing 51 is covered on the outside of the bag 53. The mesh webbing 51 is formed by knitting, for example, polyester yarn into a tubular shape. When the bag 53 is deployed, the mesh webbing 51 expands along the outer surface of the bag 53. At this time, mesh webbing 51
Shrinks in the longitudinal direction and removes the slack of the belt and gives the belt pretension. Note that the bag 53 itself also contracts in the longitudinal direction when deployed.

The outside of the mesh webbing 51 is covered with a cover 81 made of polyester plain weave or the like.
The cover 81 is opened when the bag 53 is deployed. The cover 81 is for keeping the whole air belt 31 compact and improving the touch.

The lower end of the bag 53 is provided with a gas blowing port 77.
It has become. The lower end of the mesh webbing 51 is sewn and connected to the end of the wrap webbing 41 (sewing portion 52).

The air belt 31 and the tongue 33 are connected as follows. That is, as shown in FIGS. 10 and 11, the gas blowing pipe 33d of the tongue 33 is connected to the bag 5
3 is inserted into the gas inlet 77. The gas injection pipe 33d and the gas injection port 77 are connected to the fastening band 7
It is tightened and fixed at 9. The wrap webbing 41 sewn and connected to the mesh webbing 51 is passed through the slit 33e of the hook 33c.

Next, the operation of the locking member 110 of the air belt device 21 having the above configuration will be described mainly with reference to FIGS.
This will be described with reference to FIG. In a state where the tongue 33 is not engaged with the buckle 35, as shown in FIG. 6, the ejector 161 is pushed upward by the urging force of the spring 108 and is located above. At this time, the side surface of the ejector 161 hits the engagement protrusion 137 of the latch 131, and the latch 131 is inclined to the left. Specifically, the latch 131 is
The projection 33 is inclined with the projecting end 133a (engaging with the latch fulcrum hole 121 of the side plate 115 of the buckle base 111) as a fulcrum. Also, the window 135 of the latch swing portion 135
a (see FIG. 4), the pawls 123 of the latch swing holes 123 are provided.
a (see FIG. 7B).

When engaging the tongue 33 with the buckle 35, the tongue plate 33a of the tongue 33 is
Into the upper opening 35d. At this time, the lower edge of the tongue plate 33a hits the contact portion 167 of the ejector 161 and the ejector 161 is pushed down against the urging force of the spring 108. Then, as shown in FIG. 6, the ejector 161 is lowered below the engagement protrusion 137 of the latch 131, the tongue plate 33a also advances below the engagement protrusion 137, and the protrusion 137 enters the tongue plate hole 33x, The tongue plate 33a and the latch 135 are engaged.
Since the latch 135 is urged by the button spring 107 so as to be in an upright posture as shown in FIG. 5, if the ejector 161 and the tongue plate 33a do not exist in front of the projection 137, the latch 135 will not move. The posture is 5.

At this time, the slider 141 is
Is moved upward by the contracting force of, and closes the window 135a of the latch swing portion 135. Since the window 135a of the latch swing portion 135 is closed by the slider 141, the tongue plate 33
Even if an upward pulling force is applied to a, the latch 131 does not tilt to the left and the tongue plate 33a does not come off.

In the engagement state shown in FIG.
The pull-out force is transmitted as follows. That is, the pulling force is first applied to the tongue plate 33a of the tongue 33.
From the engaging projection 137 (the tongue plate 33a and the latch 1).
31 to the latch 131.
The force received by the latch 131 is transmitted to the buckle base 111 from the protruding end 133a of the latch fulcrum 133. That is, the force here is transmitted at the latch fulcrum.

The force transmitted to the buckle base 111 is transmitted to the duct 171. More specifically, a force is transmitted from the buckle base 111 to the duct 171 via an engagement portion between the notch 113b of the substrate 113 of the buckle base 111 and the external engagement portion 175 of the duct 171. Duct 171
From the screw connection part (female screw 171a of duct 171)
The force is transmitted to the inflator 39 via the inflator 39 and a thread 39a of the inflator 39). Inflator 39
The force is further transmitted to the seat frame and the like via the anchor bracket 37.

[0051]

As is apparent from the above description, according to the present invention, a buckle and an air belt device having a simple and compact structure can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an overall configuration of an air belt device according to an embodiment of the present invention and a state when a bag is deployed.

FIG. 2 is a front view illustrating a configuration of a locking device of the air belt device according to the present embodiment.

FIG. 3 is a side sectional view showing a configuration of the locking device.

FIG. 4 is a view showing the buckle of the locking device with a cover removed and viewed from the back side.

5 is an enlarged view of FIG. 3, showing a state in which a tongue is locked to a buckle.

FIG. 6 is an enlarged sectional view of a buckle in a state where a tongue is removed.

FIG. 7 is a view showing a base which is a main part of the buckle according to the present invention, wherein (A) is a front view, (B) is a side view,
(C) is a plan view.

FIG. 8 is a view showing a connection member (duct) which is a main part of the buckle, wherein (A) is a sectional view and (B) is a perspective view.

FIG. 9 is a view showing an ejector as a main part of the buckle, wherein (A) is a front view and (B) is a perspective view.

FIG. 10 is a cross-sectional view showing a connection state of an air belt, a tongue, and an upper portion of a buckle of the air belt device of the present embodiment.

FIG. 11 is an enlarged front view of a connection portion between the tongue and the air belt.

FIG. 12 is a cross-sectional view showing another example of the connection portion between the inflator connection member (duct) and the inflator.

[Explanation of symbols]

Reference Signs List 1 seat 3 seat back 5 seat cushion 7 seat frame 11 occupant 13 chest 15 waist 21 air belt device 23 retractor 25 shoulder webbing 27 deflector 31 air belt 33 tongue 33a tongue plate 33b gas passage 33c hook portion 33d gas blowing tube 33x hole 35x hole Bracket 39 Inflator 39a Male thread 41 Wrap webbing 51 Mesh webbing 52 Sewing part 53 Bag 77 Gas inlet 79 Tightening band 81 Cover 100 Locking tool 101 Cover 103 Buckle cap 104, 106, 108 Spring 107 Button spring 110 Tongue locking mechanism 111 Buckle base 113 Substrate 113a Slit 113b Notch 113c Projection 113d, 1
3e Screw hole 114, 116 Screw 121 Latch fulcrum hole 123 Latch swing hole 123a Claw 131 Latch 133 Support point 135 Swing portion 133a Projection end 135a Window 137 Engagement projection 138 Spring hook 141 Slider 143 Projection 145 Spring hook portion 147 Contact portion 151 Holder 153 Guide post 155 Projection 161 Ejector 163 Concave portion 165 Projection 167 Contact portion 169 Spring hole 171 Duct 171a Female thread 173 Through hole 175 External locking portion 175a Neck 177 Screw hole 179 Flange 181 Pipe 185 Spring

Claims (5)

[Claims] 1. An air belt device comprising an inflatable air belt at a portion in contact with an occupant's body, comprising: a locking member for removably locking an end of the air belt to a vehicle body; and an inflator for expanding the air belt. An air belt device, comprising: the inflator being a strength member of the locking device. 2. The locking device has a buckle connected to a vehicle body (including a seat frame or the like) and a tongue connected to an end of the air belt, and the buckle is attached to the vehicle body via an inflator. The air belt device according to claim 1, wherein the air belt device is connected. 3. A buckle comprising: a tongue locking mechanism; a passage for passing an air belt inflation gas; and a connecting member for connecting the inflator to generate the gas. A buckle that is loaded on an inflator via a connecting member. 4. The tongue locking mechanism includes: a latch for holding a tongue plate; and a buckle base for swingably holding the latch. The inflator connecting member includes an outer shape locking portion for locking to a buckle base. 4. The buckle according to claim 3, further comprising a female screw or a caulked portion into which the gas ejection pipe of the inflator is screwed. 5. A buckle comprising: a tongue locking mechanism; a passage for passing an air belt inflation gas; and a connecting member for connecting to an inflator for generating the gas; wherein the passage is in a buckle width direction (a tongue width direction). A buckle, which is arranged at substantially the center of the buckle.