Conveyance seat

Provided is a conveyance seat equipped with a side airbag device with which an airbag can be inflation-deployed in a more stable state. The conveyance seat includes a seat back and a side airbag device attached to a side portion of the seat back. The seat back includes a back frame having a side frame and a side support member attached to the front part of the side frame and protruding to the seat front side beyond the side frame. The side airbag device has a first airbag inflated on the outside surface side of the side frame and a second airbag inflated on the inside surface side of the side frame. The second airbag passes through a gap formed between the side frame and the side support member in the seat front to back direction and is inflated on the inside surface side of side frame.

TECHNICAL FIELD

The present invention relates to a conveyance seat. More particularly, the present invention relates to a conveyance seat including a side airbag device for mitigating an impact applied from a side of a conveyance.

BACKGROUND ART

Known in the related art is a vehicle seat including a side airbag device attached to a side part of the seat back in the seat width direction in order to mitigate an impact applied from a side of the vehicle (see, for example, PATENT LITERATURE 1).

The vehicle seat described in PATENT LITERATURE 1 includes a seat back and a side airbag device attached to a side portion of the seat back.

The seat back has a back frame having side frames disposed on the right and left sides in the seat width direction. The side airbag device has an airbag module attached to the outside surface of the side frame.

Further, the airbag module has a first airbag inflation-deployed on the outside surface side of the side frame, a second airbag inflation-deployed on the inside surface side of the side frame, and an inflator supplying gas into the first airbag and the second airbag.

By having the first airbag and the second airbag as described above, an occupant (occupant seated in the vehicle seat) can be quickly restrained in the initial stage of the airbag inflation deployment.

CITATION LIST

Patent Literature

PATENT LITERATURE 1: WO 2019/138954 A

SUMMARY OF INVENTION

Technical Problem

By the way, as for a vehicle seat including a side airbag device as in PATENT LITERATURE 1, it has been required to restrain a seated occupant more quickly and more efficiently by airbag inflation deployment in a more stable state.

Specifically, it has been required to inflation-deploy a second airbag in particular in a more stable state in a vehicle seat including a side airbag device having a first airbag inflation-deployed on the outside surface side of a side portion of the seat back and the second airbag inflation-deployed on the inside surface side of the side portion.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a conveyance seat including a side airbag device and enabling airbag inflation deployment in a more stable state.

Solution to Problem

The above object is achieved by means of a conveyance seat including: a seat back serving as a backrest portion; and a side airbag device attached to a side part of the seat back in a seat width direction in order to mitigate an impact applied from a side of a conveyance, in which the seat back includes a back frame having side frames disposed on right and left sides in the seat width direction, and a side support member attached to a seat front part of the side frame and protruding to a seat front side beyond the side frame in order to cause a side portion of the seat back to protrude to the seat front side, the side support member elongatedly extends in an up to down direction along the side frame and is disposed to form a gap with the side frame in a seat front to back direction, the side airbag device includes an airbag module attached to one side surface that is either an outside surface or an inside surface of the side frame, the airbag module has a first airbag inflation-deployed on the one side surface side of the side frame, a second airbag inflation-deployed on the other side surface side of the side frame, and an inflator supplying gas into the first airbag and the second airbag, and the second airbag passes through the gap formed between the side frame and the side support member in the seat front to back direction and is inflation-deployed on the other side surface side of the side frame.

With the configuration described above, it is possible to realize a conveyance seat with which an airbag can be inflation-deployed in a more stable state.

Specifically, by further providing the side support member, the second airbag is capable of passing through the gap formed between the side frame and the side support member in the seat front to back direction and can be inflation-deployed on the other side surface side of the side frame. By doing so, the second airbag can be inflation-deployed in a more stable state. As a result, a seated occupant can be restrained quickly and efficiently.

At this time, the side support member may be a linear member attached to each of an upper part of the side frame and a lower part of the side frame and elongatedly extending in the up to down direction, the airbag module may be attached to the outside surface of the side frame, the first airbag may be inflation-deployed toward the seat front on the outside surface side of the side frame, and the second airbag may pass through the gap formed between the side frame and the linear member and be inflation-deployed toward an inside in the seat width direction on the inside surface side of the side frame.

With the configuration described above, the second airbag can be inflation-deployed in a stable state toward the inside in the seat width direction on the inside surface side of the side frame. As a result, the seated occupant can be restrained more quickly and more efficiently.

At this time, the seat back may include a protective member attached to the side surface of the side frame and covering the side frame, and the protective member may be disposed so as to cover at least a front end portion of the side frame and a rear end portion of the side frame.

In addition, the side frame may have a frame main body portion extending in the seat front to back direction, a front flange portion protruding to an inside in the seat width direction continuously from a front end portion of the frame main body portion, and a rear flange portion protruding to the inside in the seat width direction continuously from a rear end portion of the frame main body portion, the protective member may be a flexible protective plate, and the protective plate may have a plate main body portion covering an inside surface of the frame main body portion, a plate front portion folded back in order to cover the front flange portion continuously from a front end portion of the plate main body portion, and a plate rear portion folded back in order to cover the rear flange portion continuously from a rear end portion of the plate main body portion.

In addition, the back frame may have an upper frame connecting upper end portions of the right and left side frames, and the seat back may include a second protective member covering a part of the upper frame connected to the upper end portion of the side frame.

By providing the protective member protecting the side frame (side frame end portion in particular) as described above, it is possible to suppress unintentional contact of the inflation-deployed second airbag with the side frame (side frame end portion). As a result, the second airbag can be inflation-deployed stably.

At this time, the seat back may include a pad material disposed on a front surface of the back frame, a skin material covering the back frame and the pad material, and a movable body provided at the side portion of the seat back, disposed between the side frame and the pad material in the seat front to back direction, and movable in order to cause the pad material to protrude to the seat front side at the side portion, and the movable body may move to the seat front side as the second airbag is inflation-deployed and cause the pad material to protrude to the seat front side.

In addition, the movable body may have a rotating member attached to the side support member so as to be rotatable, rotating to the seat front side as the second airbag is inflation-deployed, and causing the pad material to protrude to the seat front side.

In addition, the rotating member may have a rotating main body portion attached to the side support member so as to be rotatable and extending to a seat rear from the side support member along a bottom surface of the pad material, and a protruding portion protruding from a front surface of the rotating main body portion toward the pad material and abutting against the pad material.

By providing the movable body (rotating body) movable to the seat front side as the second airbag is inflation-deployed as described above, the deployment force of the second airbag can be efficiently transmitted to the pad material. As a result, the seated occupant can be restrained more quickly and efficiently.

At this time, the side airbag device may further include a guide member guiding the inflation deployment of the second airbag, one end portion of the guide member may be attached to the side frame or an attachment bracket attached to the side frame, and the other end portion of the guide member may be attached to the movable body.

In addition, the side airbag device may further include a guide member guiding the inflation deployment of the second airbag, one end portion of the guide member may be attached to an attachment bracket attached to the side surface of the side frame, and the other end portion of the guide member may be attached to the second airbag, and the attachment bracket may be fastened together with the side frame by an assembly shaft provided on the inflator and protruding from the inflator toward the seat width direction.

In addition, the attachment bracket may have a slit disposed inside the side frame in the seat width direction for the one end portion of the guide member to be inserted therethrough and attached.

By providing the guide member as described above, it is possible to prevent the inflation-deployed second airbag from slipping into the seat rear beyond the side frame.

In addition, by providing the attachment bracket as described above, the guide member can be attached stably.

In addition, since the attachment bracket is fastened together with the side frame by the attachment shaft protruding from the inflator toward the seat width direction, the airbag module and the guide member can be attached stably.

In addition, since the attachment bracket has the slit, one end portion of the guide member can be attached with ease.

At this time, the seat back may include a pad material disposed on a front surface of the back frame and a skin material covering the back frame and the pad material, the side airbag device may have a retainer member holding the airbag module from a seat rear side, the retainer member may have a rear wall portion disposed on the seat rear side of the airbag module, and a side wall portion extending to the seat front side along a side surface of the airbag module continuously from one end portion of the rear wall portion in the seat width direction, and the side wall portion may extend to the seat front side up to a skin burst-open portion or a position reaching a vicinity of the skin burst-open portion provided at the skin material and burst-opening when the first airbag is inflation-deployed.

In addition, the side airbag device may have a retainer member holding the airbag module from a seat rear side, the retainer member may have a rear wall portion disposed on the seat rear side of the airbag module, a side wall portion disposed along the other side surface of the side frame, and a reinforcement portion attached to a rear surface of the rear wall portion and protruding to the seat rear, and the side wall portion may be fastened together with the side frame by an assembly shaft provided on the inflator and protruding from the inflator toward the seat width direction.

By having the retainer member as described above, the retainer member is capable of suitably receiving pressure entailed by the inflation deployment of the airbag. As a result, the inflation deployment directions of the first airbag and the second airbag can be stabilized.

In addition, the retainer member extends to the seat front side up to the skin burst-open portion or the position reaching the vicinity of the skin burst-open portion burst-opening when the first airbag is inflation-deployed. Therefore, the pressure received by the retainer member can be efficiently transmitted to the skin burst-open portion to burst-open the skin burst-open portion.

In addition, the retainer member can be stably attached since the retainer member is fastened together with the side frame by the assembly shaft protruding from the inflator toward the seat width direction.

At this time, the side airbag device may have a retainer member holding the airbag module from a seat lateral side, the retainer member may have a side wall portion disposed along the side surface of the side frame, a front wall portion protruding in the seat width direction continuously from a front end portion of the side wall portion and disposed on a seat rear side of the second airbag when the second airbag is inflation-deployed, and a reinforcement portion attached to a rear surface of the front wall portion and protruding to the seat rear, and the side wall portion may be fastened together with the side frame by an assembly shaft provided on the inflator and protruding from the inflator toward the seat width direction.

By having the retainer member as described above, the retainer member is capable of suitably receiving pressure entailed by the inflation deployment of the second airbag. As a result, the inflation deployment direction of the second airbag can be stabilized.

In addition, since the retainer member has the reinforcement portion, the holding force of the retainer member can be increased efficiently.

At this time, the seat back may include a pad material disposed on a front surface of the back frame and a skin material covering the back frame and the pad material, the pad material may have a pad through hole formed at a position in front of the airbag module in the side portion of the seat back and penetrating the pad material from an outside surface to an inside surface, the skin material may have a skin burst-open portion burst-opening during the inflation deployment of the first airbag on an outside surface of the side portion, the side airbag device may include a guide member guiding the inflation deployment of the first airbag, and the guide member may have a configuration in which one end portion of the guide member is attached to a front part or an outside part of the skin material at the side portion, the guide member extends continuously from the one end portion of the guide member and passes through the pad through hole formed in the outside surface of the pad material at the side portion, and the other end portion of the guide member passes through the pad through hole formed in the inside surface of the pad material at the side portion and is attached to an inside part of the skin material at the side portion.

With the above configuration, the guide member is capable of suitably guiding the pad material moving along with the inflation deployment of the airbag on the side portion of the seat back. As a result, the airbag can be inflation-deployed more quickly.

Advantageous Effects of Invention

According to the present invention, it is possible to realize a conveyance seat with which an airbag can be inflation-deployed in a more stable state. Further, an occupant seated in the conveyance seat can be restrained quickly and efficiently.

In addition, according to the present invention, the second airbag can be inflation-deployed in a stable state toward the inside in the seat width direction on the inside surface side of the side frame.

In addition, according to the present invention, by means of the protective member, it is possible to suppress contact of the inflation-deployed second airbag with the side frame (side frame end portion).

In addition, according to the present invention, by means of the movable body, the deployment force of the second airbag can be efficiently transmitted to the pad material. As a result, the seated occupant can be restrained more quickly and efficiently.

In addition, according to the present invention, by means of the guide member, it is possible to prevent the inflation-deployed second airbag from slipping into the seat rear beyond the side frame.

In addition, according to the present invention, by means of the attachment bracket, the guide member and the airbag module can be attached stably. In addition, one end portion of the guide member can be attached with ease.

In addition, according to the present invention, by means of the retainer member, pressure entailed by the inflation deployment of the airbag can be received suitably. In addition, the pressure received by the retainer member can be transmitted to the skin burst-open portion to efficiently burst-open the skin burst-open portion. In addition, the retainer member can be attached stably.

In addition, according to the present invention, by means of the retainer member, pressure entailed by the inflation deployment of the second airbag can be received suitably. In addition, the holding force of the retainer member can be efficiently increased by the reinforcement portion.

In addition, according to the present invention, by means of the guide member, it is possible to suitably guide the pad material moving along with the inflation deployment of the airbag on the side portion of the seat back.

DESCRIPTION OF EMBODIMENTS

Embodiments according to the present invention will be described below with reference toFIGS.1to22.

The present embodiment relates to the invention of a conveyance seat including a side airbag device at a side portion of a seat back. The seat back includes a back frame having a side frame and a side support member attached to the front part of the side frame. The side airbag device includes a first airbag inflation-deployed on the outside surface side of the side frame and a second airbag inflation-deployed on the inside surface side of the side frame. The second airbag passes through the gap formed between the side frame and the side support member in the seat front to back direction and is inflation-deployed on the inside surface side of the side frame.

It should be noted that the side where a seated occupant sits with respect to the seat back of the conveyance seat is the seat front side.

First Embodiment

First, a conveyance seat S1of a first embodiment will be described with reference toFIGS.1to5.

As illustrated inFIGS.1and2, the conveyance seat S1is a vehicle seat and includes a seat main body having a seat cushion1, a seat back2, and a headrest3, side support members30attached to the side parts of the seat back2in the seat width direction in order to cause the side portions of the seat back2to protrude to the seat front side and be held, and a side airbag device40attached to the side part of the seat back2in the seat width direction in order to mitigate an impact applied from the side of the vehicle.

As illustrated inFIG.1, the seat cushion1is a seating portion that supports a seated occupant from below and is configured by placing a pad material1aon a cushion frame10, which serves as a skeleton and is illustrated inFIG.2, and being covered with a skin material1b.

The seat cushion1is configured from a middle portion1A at the middle part in the seat width direction and right and left side portions1B (side bolster portions) outside the middle portion1A in the seat width direction.

As illustrated inFIG.1, the seat back2is a backrest portion that supports the back of the seated occupant from behind and is configured by placing a pad material2aon a back frame20, which serves as a skeleton and is illustrated inFIG.2, and being covered with a skin material2b.

The seat back2is configured from a middle portion2A at the middle part in the seat width direction and right and left side portions2B outside the middle portion2A in the seat width direction.

It should be noted that right and left pull-in grooves extending in the up to down direction are formed on the surface of the pad material2aso as to divide the middle portion2A and the right and left side portions2B.

As illustrated inFIG.1, the headrest3is a head portion that supports the head of the seated occupant from behind and is configured by placing a pad material3aon a pillar3cserving as a core material and being covered with a skin material3b.

It should be noted that a pillar attachment member26for attaching the pillar3csupporting the main body of the headrest3is assembled to the upper portion of the back frame20.

As illustrated inFIG.2, the cushion frame10as a rectangular frame-shaped body is configured mainly from cushion side frames11disposed on the right and left sides, a plate-shaped pan frame12(bridging frame) provided to serve as a bridge between the front end parts of the cushion side frames11, a rear connection frame13connecting the rear parts of the cushion side frames11, and a plurality of support members14(elastic springs) hooked on the pan frame12and the rear connection frame13and extending in the seat front to back direction.

The cushion side frame11is a plate-shaped frame elongated in the seat front to back direction.

It should be noted that a reclining device4is attached to the rear part of the cushion side frame11and a rail device6is attached to the lower part of the cushion side frame11via a height link device5.

As illustrated inFIG.2, the back frame20as a rectangular frame-shaped body is configured mainly from side frames21disposed on the right and left sides, an inverted U-shaped upper frame22interconnecting the upper end parts of the side frames21, a plate-shaped lower frame23interconnecting the lower end parts of the side frames21, a plurality of wire members24(elastic wires) respectively hooked on the side frames21and extending in the seat width direction, and a support plate25held by the plurality of wire members24and supporting the seated occupant.

It should be noted that the back frame20further includes the pillar attachment member26attached to the middle part of the upper frame22in the seat width direction in order to attach the pillar3cof the headrest3.

The side frame21is a sheet metal member extending in up to down direction and having a substantially C-shaped cross section. The lower end part of the side frame21is connected to the rear end part of the cushion side frame11via the reclining device4.

By means of the reclining device4, the back frame20is capable of rotating relative to the cushion frame10.

Specifically, as illustrated inFIGS.2and4A, the side frame21has a frame main body portion21aextending in the seat front to back direction, a front flange portion21bprotruding to the inside in the seat width direction continuously from the front end portion of the frame main body portion21a, and a rear flange portion21cprotruding to the inside in the seat width direction continuously from the rear end portion of the frame main body portion21a.

In addition, as illustrated inFIGS.4A and4B, a protective member27is attached to the inside surface of the side frame21to cover the side frame21from the inside in the seat width direction.

In addition, as illustrated inFIG.5, a second protective member28is attached to the lower end part of the upper frame22that is connected to the upper end portion of the side frame21and covers the lower end part from below.

The protective member27is a flexible protective plate that protects the side frame21.

As illustrated inFIGS.4A and4B, the protective member27has a plate main body portion27acovering the inside surface of the frame main body portion21a, a plate front portion27bfolded back in order to cover the front flange portion21bcontinuously from the front end portion of the plate main body portion27a, and a plate rear portion27cfolded back in order to cover the rear flange portion21ccontinuously from the rear end portion of the plate main body portion27a.

The second protective member28is a flexible protective cap that protects the upper frame22and is attached to the lower end portion of the pipe-shaped upper frame22.

The protective member27and the second protective member28have the function of preventing the airbag of the side airbag device40from coming into direct contact with the back frame20when the airbag has been inflation-deployed.

As illustrated inFIG.5, the protective member27is attached along the side frame21so as to be elongated in the up to down direction.

In addition, the protective member27is disposed at a position overlapping the side airbag device40in the up to down direction and the seat front to back direction (specifically, the same position).

As illustrated inFIGS.2,3A, and3B, the side support members30are linear members made of a metal material (specifically, wire members) and are attached by welding to the seat front parts of the right and left side frames21.

The side support member30is attached to the front surface of the side frame21, protrudes to the seat front side beyond the side frame21, and is a member for causing the side portion2B of the seat back2to protrude to the seat front side.

It should be noted that although details will be described later, the side support member30has the function of causing the side portion of the seat back2to protrude to the seat front side and holding the side portion and a function for inflation-deploying the airbag of the side airbag device40in a stable state.

Specifically, the side support member30is configured mainly from a wire main body portion31elongatedly extending along the elongation direction of the side frame21and a wire extending portion32extending rearward from the upper end portion of the wire main body portion31.

Further, the wire extending portion32is welded and fixed in a state of abutting against the front surface of the upper part of the side frame21, and the lower end portion of the wire main body portion31is welded and fixed in a state of abutting against the front surface of the lower part of the side frame21.

In the above configuration, as illustrated inFIGS.2and3A, the side support member30elongatedly extends in the up to down direction along the side frame21and is disposed to form a gap G with the side frame21in the seat front to back direction.

In addition, the side support member30is disposed at a position overlapping the side airbag device40in the up to down direction and the seat front to back direction (specifically, the same position).

As illustrated inFIGS.1to3A and3B, the side airbag device40has a configuration in which folded airbags42and43are inflation-deployed, in a balloon shape and toward the seat front side, in the event of an impact from the side of the vehicle body.

As illustrated inFIGS.4A and4B, the side airbag device40includes an airbag module41provided in the pad material2ain the side portion2B of the seat back2and attached to the outside surface of the side frame21.

The airbag module41is configured mainly from the first airbag42inflation-deployed on the outside surface side of the side frame21, the second airbag43inflation-deployed on the inside surface side of the side frame21, an inflator44supplying gas into the first airbag42and the second airbag43, and a harness (not illustrated) connected to the inflator44and supplying electric power for ignition to the inflator44.

It should be noted that the harness is connected to a vehicular battery (not illustrated) disposed on the vehicle body.

As illustrated inFIGS.4A and4B, the first airbag42is inflation-deployed toward the seat front on the outside surface side of the side frame21.

The second airbag passes through the gap G formed between the side frame21and the side support member30and is inflation-deployed toward the seat front and the inside in the seat width direction on the inside surface side of the side frame21.

Specifically, the airbags42and43are inflation-deployed by gas supply from the inflator44, which is a gas generation source, toward the insides of the airbags42and43.

The inflator44is an elongated and substantially cylindrical gas generator and is disposed so as to be elongated in the up to down direction.

The inflator44has a plurality of assembly shafts44aprotruding to the inside in the seat width direction from the outside surface thereof and assembled to the side frame21.

It should be noted that the inflator44further has an airbag connecting portion (not illustrated) protruding from the outer surface thereof and connected to the inside of the airbag11and a harness connecting portion (not illustrated) formed on the outer surface of the inflator44and connected to the harness.

The plurality of assembly shafts44aare disposed at intervals in the up to down direction. Each of the plurality of assembly shafts44apasses through assembly holes provided in the side frame21and the protective member27and is fastened to an assembly nut44b.

In other words, the assembly shaft44afastens the side frame21and the protective member27together with the assembly nut44b.

In the above configuration, as illustrated inFIGS.4A and4B, in the event of inflation deployment of the airbags42and43, the pad material2ais divided into an inner pad tab and an outer pad2acby a pad through hole2aaserving as a branching point and deployed.

In addition, in the event of inflation deployment of the airbags42and43, the skin material2bis divided into an inner skin material2bband an outer skin material2bcby a skin burst-open portion2baserving as a branching point and deployed.

The pad through hole2aais a through hole penetrating the pad material2ain the seat front to back direction and is formed so as to be elongated in the up to down direction.

Likewise, the skin burst-open portion2bais formed so as to be elongated in the up to down direction.

The pad through hole2aaand the skin burst-open portion2baare formed at positions closer to the seat front than the airbag module41and are disposed at positions overlapping the airbag module41in the seat width direction (specifically, the same positions).

Therefore, the airbag can be inflation-deployed in a more stable state.

In addition, in the above configuration, as illustrated inFIGS.4A and4B, the second airbag43is configured to pass through the gap G formed between the side frame21and the side support member30in the seat front to back direction and be inflation-deployed on the inside surface side of the side frame21.

Therefore, the second airbag43can be inflation-deployed toward the seat front and the inside in the seat width direction in a more stable state.

In other words, by using the side support member30as a guide member, it is possible to suppress, for example, unintentional deployment of the second airbag43toward the seat front side.

In addition, in the above configuration, as illustrated inFIGS.4A,4B, and5, the protective member27and the second protective member28are attached so as to cover the side frame21and the upper frame22, respectively.

Regarding the protective member27in particular, the plate front portion27bis provided so as to not only cover the tip portion of the side frame21(front flange portion21b) so as to be folded back but also cover the entire (substantially the entire) front surface of the front flange portion21b.

Further, the plate rear portion27calso covers the tip portion of the side frame21(rear flange portion21c) so as to be folded back. It should be noted that it is not particularly necessary to cover the entire rear surface of the side frame21and thus covering is performed up to the periphery of the tip portion of the rear flange portion21c.

Therefore, unintentional contact of the inflation-deployed second airbag43with the end portion of the side frame21can be suitably suppressed.

Others

Although the side support member30and the side airbag device40in the above embodiment are attached to the side portion2B of the seat back2as illustrated inFIGS.1and2, the attachment is not particularly limited and the side support member30and the side airbag device40may be attached to the side portion1B of the seat cushion1.

Although the side support member30in the above embodiment is a wire member formed of a metal material as illustrated inFIG.2, this is changeable and is not particularly limited.

The side support member30may be configured to hold the seated occupant from the side in the seat width direction and may be, for example, a plate-shaped member, a rod-shaped member, a movable plate, an inflatable bag member, or the like.

Although the protective member27in the above embodiment is configured as a protective plate as illustrated inFIGS.4A and5, this is changeable and is not particularly limited.

For example, the protective member27may be divided into a member covering the front end portion of the side frame21and a member covering the rear end portion of the side frame21and configured from the plurality.

Although the side airbag device40(airbag module41) in the above embodiment is attached to the outside surface of the side frame21as illustrated inFIGS.4A and4B, the attachment is not particularly limited and the side airbag device40(airbag module41) may be attached to the inside surface of the side frame21.

In the above case, it is preferable that the first airbag42is inflation-deployed on the inside surface side of the side frame and the second airbag43passes through the gap G formed between the side frame21and the side support member30and is inflation-deployed on the outside surface side of the side frame21.

Second Embodiment

Next, a conveyance seat S2of a second embodiment will be described with reference toFIGS.6to9.

It should be noted that description of content overlapping with the conveyance seat S1described above will be omitted.

As illustrated inFIGS.6,7A, and7B, the conveyance seat S2includes a seat main body having a seat back102, a side support member130, a side airbag device140, and a movable body150attached to a side portion102B of the seat back102and causing a pad material102aof the side portion102B to protrude to the seat front side as the airbag is inflation-deployed.

As illustrated inFIGS.7A,7B, and8, the side airbag device140includes an airbag module141having a first airbag142, a second airbag143, and an inflator144and a guide member145guiding the inflation deployment of the second airbag143.

The guide member145is a cloth member (stay cloth) that guides the inflation deployment direction of the second airbag143to the seat front side and the inside in the seat width direction. The guide member145may be a strap.

The guide member145has a configuration in which one end portion145aof the guide member145is attached to the front end portion of a side frame121, the guide member145extends to the seat rear continuously from the one end portion145a, the guide member145is folded back near the rear end portion of the side frame121, and the other end portion145bof the guide member is attached to the rear end portion of the movable body150.

Specifically, as illustrated inFIG.8, the one end portion145aof the guide member145is attached to an attachment bracket146attached to the inside surface of the side frame121. In addition, as illustrated inFIGS.7A and7B, the other end portion145bof the guide member145is attached to the back surface of the rear end portion of the movable body150.

Preferably, the other end portion145bis attached to the back surface of the movable body150with an adhesive or the like. Alternatively, a trim cord (not illustrated) made of resin may be sewn to the other end portion145band the other end portion145bmay be hooked on the back surface of the movable body150via the trim cord.

It should be noted that the other end portion145bmay be attached to the tip portion of the second airbag143. In that case, it is preferable that the other end portion145bis attached at the position that becomes the rear surface of the tip portion of the second airbag143when the second airbag143is inflation-deployed.

As illustrated inFIG.8, the attachment bracket146is a plate body having a substantially J-shaped cross section and is fastened together with the side frame121by an assembly shaft144aprotruding to the inside in the seat width direction from the inflator144.

In addition, the attachment bracket146has a slit146adisposed inside the side frame121in the seat width direction for the one end portion145aof the guide member145to be inserted therethrough and attached.

The airbag module141and the guide member145can be stably attached by the attachment bracket146. In addition, one end portion of the guide member145can be attached with ease.

It should be noted that the attachment bracket146may be made unnecessary, and the one end portion145aof the guide member145may be directly attached to the side frame121with an adhesive or the like.

As illustrated inFIGS.7A and7B, the movable body150is a member that protrudes to the seat front side (from a normal position to a protruding position) as the second airbag143is inflation-deployed and is disposed between the side frame121and the pad material102ain the seat front to back direction.

The movable body150has a rotating member152attached to the side support member130so as to be rotatable via an attachment portion151, rotating to the seat front side as the second airbag143is inflation-deployed, and causing the pad material102ato protrude to the seat front side.

A plurality of the attachment portions151, which are hook-shaped members, are provided at intervals along the elongation direction of the side support member130to sandwich the side support member130.

The rotating member152has a rotating main body portion152arotatably attached to the side support member130and extending to the seat rear from the side support member130along the bottom surface of the pad material102aand a plurality of protruding portions152b(protruding ribs) protruding from the front surface of the rotating main body portion152atoward the pad material102aand abutting against the pad material102a.

The rotating main body portion152ais a plate body elongatedly extending in the up to down direction, and the plurality of protruding portions152bare disposed at intervals along the elongation direction of the rotating main body portion152a.

By providing the guide member145as described above, it is possible to prevent the inflation-deployed second airbag143from slipping into the seat rear beyond the side frame121.

In addition, by providing the movable body150as described above, the deployment force of the second airbag143can be efficiently transmitted to the pad material102a. As a result, the seated occupant can be restrained more quickly and efficiently.

Others

In the above embodiment, as illustrated inFIGS.7A and7B, the movable body150protrudes to the seat front side as the second airbag143is inflation-deployed and efficiently transmits the deployment force of the second airbag143to the pad material102a.

At this time, a pad high-hardness portion higher in hardness than the pad material102amay be provided at the part of the back surface of the pad material102athat faces the movable body150(rotating member152).

For example, the pad high-hardness portion may be molded integrally with the pad material102aand may be at a part directly pressed by the movable body150.

By doing so, the movable body150is capable of more efficiently transmitting the deployment force of the second airbag143to the pad material102a.

Although the attachment bracket146in the above embodiment is attached to the inside surface of the side frame121as illustrated inFIG.8, this is changeable and is not particularly limited.

For example, as illustrated inFIG.9, the attachment bracket146may be attached to the outside surface of the side frame121. Alternatively, the attachment bracket146may be attached to the front surface of the side frame121.

Third Embodiment of Conveyance Seat

Next, a conveyance seat S3of a third embodiment will be described with reference toFIGS.10to11A and11B.

It should be noted that description of content overlapping with the conveyance seats S1and S2described above will be omitted.

The conveyance seat S3includes a seat main body having a seat back202, a side support member230, a side airbag device240, and a movable body250attached to a side portion202B of the seat back202and causing a pad material202aof the side portion202B to protrude to the seat front side as the airbag is inflation-deployed.

As illustrated inFIGS.11A and11B, the side airbag device240includes an airbag module241having a first airbag242, a second airbag243, and an inflator244and a guide member245guiding the inflation deployment of the second airbag243.

The airbag module241is attached to the outside surface of a side frame221. Specifically, an assembly shaft244aof the inflator244penetrates the side frame221and is fastened with an assembly nut244b.

The guide member245is a stay cloth that guides the inflation deployment direction of the second airbag243. The guide member245may be a strap.

A ring-shaped attachment member246is attached to one end portion245aof the guide member245.

The ring-shaped attachment member246is inserted into an attachment groove244c(attached portion) formed in the outer surface of the assembly nut244band connected to the assembly nut244b.

With the above configuration, the one end portion245aof the guide member245is connected to the assembly nut244bvia the attachment member246. In addition, the other end portion245bof the guide member245is attached to the back surface of the movable body250with an adhesive or the like.

With the conveyance seat S3described above, the airbags242and243can be inflation-deployed in a more stable state. In particular, the second airbag243can be inflation-deployed in a stable state on the inside surface side of the side frame221.

Fourth Embodiment of Conveyance Seat

Next, a conveyance seat S4of a fourth embodiment will be described with reference toFIGS.12to14.

It should be noted that description of content overlapping with the conveyance seats S1to S3described above will be omitted.

As illustrated inFIGS.12and13, the conveyance seat S4includes a seat main body having a seat back302, a side support member330, a side airbag device340having an airbag module341, and a retainer member360holding the airbag module341from the seat rear side.

The retainer member360is a holding member made of metal or resin and holding airbags342and343and an inflator344from the seat rear side and receives pressure entailed when the airbags342and343are inflation-deployed.

The retainer member360has a substantially U-shaped cross section and has a rear wall portion361disposed on the seat rear side of the airbag module341and an inside wall portion362and an outside wall portion363extending to the seat front side continuously from both end portions of the rear wall portion361in the seat width direction.

The inside wall portion362and the outside wall portion363respectively extend in the seat front to back direction along the side surfaces of the airbag module341.

The inside wall portion362is fastened together with a side frame321by an assembly shaft344aprotruding to the inside in the seat width direction from the inflator344.

The outside wall portion363extends to the seat front side up to a skin burst-open portion302baor a position reaching the vicinity of the skin burst-open portion302baprovided at a side part of a skin material302band burst-opening when the first airbag342is inflation-deployed.

Specifically, the tip portion (front end portion) of the outside wall portion363is disposed at a position overlapping the skin burst-open portion302bain the seat front to back direction and the up to down direction (the same position).

It should be noted that the tip portion of the outside wall portion363may be attached to the skin burst-open portion302bawith an adhesive or the like. Preferably, the tip portion of the outside wall portion363is attached to the skin burst-open portion302baof an outer skin material302bc.

In addition, the tip portion of the outside wall portion363may be attached to the skin burst-open portion302bavia an attachment member (attachment plate), which is not illustrated.

By providing the retainer member360as described above, it is possible to suitably receive pressure entailed by the inflation deployment of the airbags342and343. In addition, the pressure received by the retainer member360can be transmitted to the skin burst-open portion302bato efficiently burst-open the skin burst-open portion302ba. In addition, the retainer member360can be stably attached.

Modification Example 1 of Retainer Member

Next, Modification Example 1 of the retainer member360will be described with reference toFIG.14.

The retainer member360of Modification Example 1 has a substantially U-shaped cross section and has the rear wall portion361disposed on the seat rear side of the airbag module341and the inside wall portion362and the outside wall portion363extending to the seat front side continuously from both end portions of the rear wall portion361in the seat width direction.

The inside wall portion362and the outside wall portion363respectively extend in the seat front to back direction along the side surfaces of the airbag module341.

The outside wall portion363extends to the seat front side up to the skin burst-open portion302baor a position reaching the vicinity of the skin burst-open portion302baprovided at the front end part of the skin material302band burst-opening when the first airbag342is inflation-deployed.

Specifically, the tip portion (front end portion) of the outside wall portion363extends to the seat front beyond the side support member330and is disposed at a position overlapping the skin burst-open portion302bain the seat front to back direction and the up to down direction (the same position).

It should be noted that the tip portion of the outside wall portion363may be directly attached to the skin burst-open portion302baor may be attached to the skin burst-open portion302bavia an attachment member (attachment plate), which is not illustrated.

By providing the retainer member360as described above, it is possible to suitably receive pressure entailed by the inflation deployment of the airbags342and343. In addition, the pressure received by the retainer member360can be transmitted to the skin burst-open portion302bato efficiently burst-open the skin burst-open portion302ba.

Fifth Embodiment of Conveyance Seat

Next, a conveyance seat S5of a fifth embodiment will be described with reference toFIGS.15and16.

It should be noted that description of content overlapping with the conveyance seats S1to S4described above will be omitted.

The conveyance seat S5includes a seat main body having a seat back402, a side support member430, a side airbag device440having an airbag module441, and a retainer member460holding the airbag module441from the seat rear side.

The retainer member460is a holding member holding airbags442and443and an inflator444from the seat rear side.

The retainer member460has a substantially L-shaped cross section and has a rear wall portion461disposed on the seat rear side of the airbag module441and an outside wall portion463extending to the seat front side continuously from one end portion of the rear wall portion461in the seat width direction.

The outside wall portion463extends in the seat front to back direction along a side surface of the airbag module441.

As illustrated inFIG.16, the retainer member460is attached in a state of being accommodated in a bag-shaped holder member447.

The holder member447is formed by, for example, pasting two skin materials together and sewing the materials into a bag shape.

One end portion447aof the holder member447in the seat width direction is connected to a skin burst-open portion402baprovided at a side part of a skin material402band burst-opening when the first airbag442is inflation-deployed. In other words, the holder member447is attached integrally with the skin material402b.

It should be noted that the one end portion447amay extend to the seat front side up to a position reaching the vicinity of the skin burst-open portion402baand be connected to a predetermined position on the back surface of the skin material402b.

The other end portion447bof the holder member447in the seat width direction is attached to the back surface of the rear end portion of a side frame421with an adhesive or the like.

It should be noted that the other end portion447bmay be attached to the rear surface of the side frame421via an attachment member (attachment plate), which is not illustrated.

By providing the retainer member460as described above, it is possible to suitably receive pressure entailed by the inflation deployment of the airbags442and443.

In addition, the retainer member460can be stably attached by providing the holder member447.

Sixth Embodiment of Conveyance Seat

Next, a conveyance seat S6of a sixth embodiment will be described with reference toFIGS.17and18.

It should be noted that description of content overlapping with the conveyance seats S1to S5described above will be omitted.

The conveyance seat S6includes a seat main body having a seat back502, a side support member530, a side airbag device540having an airbag module541, and a retainer member560holding the airbag module541from the seat rear side.

As illustrated inFIG.17, the airbag module541is attached to the upper part of the seat back502and disposed so as to straddle a side frame521and an upper frame522in the up to down direction.

As illustrated inFIG.18, the retainer member560is a holding member holding airbags542and543and an inflator544from the seat rear side, is disposed at a position above the side frame521, and is disposed at the same height position as the lower end part of the upper frame522.

The retainer member560has a substantially U-shaped cross section and has a rear wall portion561disposed on the seat rear side of the airbag module541, an outside wall portion563extending to the seat front side continuously from one end portion (outside end portion) of the rear wall portion561in the seat width direction, and a frame attachment portion564protruding to the seat front side from the other end portion (inside end portion) of the rear wall portion561in the seat width direction and attached to the upper frame522.

The frame attachment portion564is a hook member having a substantially C-shaped cross section and can be attached so as to sandwich the pipe-shaped upper frame522from the seat rear.

It should be noted that the frame attachment portion564is not limited to a hook shape and may have any shape insofar as the frame attachment portion564can be attached to the upper frame522. The frame attachment portion564may be attached to the upper frame522with an adhesive or the like.

By providing the retainer member560as described above, it is possible to suitably receive pressure entailed by the inflation deployment of the airbags542and543.

In addition, the retainer member560can be stably attached by providing the frame attachment portion564.

Seventh Embodiment of Conveyance Seat

Next, a conveyance seat S7of a seventh embodiment will be described with reference toFIGS.19to21.

It should be noted that description of content overlapping with the conveyance seats S1to S6described above will be omitted.

The conveyance seat S7includes a seat main body having a seat back602, a side airbag device640having an airbag module641, and a retainer member670holding the airbag module641from the seat rear side.

As illustrated inFIG.20, the seat back602includes a pad material602adisposed on the front surface of a back frame620and a skin material602bcovering the back frame620and the pad material602a.

The pad material602ahas pad through holes602aaand602adformed at positions in front of the airbag module541in a side portion602B of the seat back602and penetrating the pad material602afrom the outside surface to the inside surface.

The skin material602bhas a skin burst-open portion602baburst-opening during the inflation deployment of airbags642and643on the outside surface of the side portion602B.

As illustrated inFIG.20, the side airbag device640includes the airbag module641having the first airbag642, the second airbag643, and an inflator644and a guide member645guiding the inflation deployment of the airbags642and643.

The airbag module641is attached to the outside surface of a side frame621. Specifically, an assembly shaft644aof the inflator644penetrates the side frame621and a retainer member660and is fastened with an assembly nut.

It should be noted that the side airbag device640may not have the second airbag643.

The guide member645is a stay cloth that guides the inflation deployment directions of the airbags642and643. The guide member645may be a strap.

One end portion645aof the guide member645is attached by sewing to the back surface of the front end portion of the skin material602b(specifically, an inner skin material602bb).

The guide member645extends from the one end portion645ato the seat rear so as to cover the pad material602a(specifically, the pad material602aof the side portion602B) from the outside and further extends so as to pass through the pad through hole602aaof the pad material602a.

The other end portion645bof the guide member645passes between the pad material602aand the airbag module641in the seat front to back direction, extends toward the inside in the seat width direction, and passes through the pad through hole602ad. Then, the other end portion645bis attached to the back surface of the inside end portion in the seat width direction of the side portion602B of the skin material602b.

A plate-shaped attachment member645c(for example, a trim cord made of resin) is sewn to the other end portion645bof the guide member645. Further, the other end portion645bis hooked so as to be sandwiched between the pad material602aand the skin material602bvia the attachment member645c.

Specifically, the attachment member645cis folded when the other end portion645bof the guide member645is passed through the pad through hole602aa. Further, in hooking the other end portion645b, the attachment member645cis raised (raised so as to form a T shape) and hooked in the space between the pad material602aand the skin material602b.

By providing the guide member645as described above, it is possible to suitably guide the deployment direction of the side portion602B of the seat back602when the airbag is inflation-deployed. As a result, the airbag can be deployed with speed.

In addition, the guide member645can be easily attached by providing the attachment member645c.

As illustrated inFIG.20, the retainer member670is a holding member having a substantially T-shaped cross section and holding the airbag module641from the seat rear side and is attached to the side frame621.

The retainer member670has a rear wall portion671disposed on the seat rear side of the airbag module641and the side frame621, a folded-back wall portion672formed by folding back the right end portion of the rear wall portion671and extending to the outside in the seat width direction along the rear end portion (rear flange portion621c) of the side frame621, and a side wall portion673bent from the extending end portion of the folded-back wall portion672and extending to the seat front along the inside surface of the side frame621.

The retainer member670is attached to the side frame621from the inside in the seat width direction and is attached so as to sandwich a part (rear flange portion621c) of the side frame621.

In addition, the retainer member670(side wall portion673) is fastened together with the side frame621by the assembly shaft644aprovided on the inflator644and protruding from the inflator644toward the inside in the seat width direction.

The retainer member670further has a first reinforcement portion674attached to the rear surface of the rear wall portion671and protruding to the seat rear and a second reinforcement portion675attached to the connection part between the folded-back wall portion672and the side wall portion673and protruding from the side wall portion673to the inside in the seat width direction.

Each of the first reinforcement portion674and the second reinforcement portion675is a reinforcement rib (screen portion) having a substantially triangular section and disposed at a position corresponding to the airbag module641.

Specifically, the first reinforcement portion674is disposed at a position overlapping the airbag module641in the seat width direction and the up to down direction (the same position) and protrudes in a direction away from the airbag module641.

The second reinforcement portion675is disposed at a position overlapping the airbag module641in the seat front to back direction and the up to down direction (the same position) and protrudes in a direction away from the airbag module641.

Each of the first reinforcement portion674and the second reinforcement portion675is disposed at a position close to the inflator644and disposed so as to surround the inflator644.

By providing the retainer member670as described above, it is possible to suitably receive pressure entailed by the inflation deployment of the airbags642and643.

Modification Example 1 of Guide Member

Next, Modification Example 1 of the guide member645will be described with reference toFIG.21.

The guide member645is a stay cloth that guides the inflation deployment directions of the airbags642and643.

The one end portion645aof the guide member645is attached by sewing to the back surface of the front end portion of the skin material602b.

The guide member645extends from the one end portion645ato the seat rear so as to cover the pad material602afrom the outside and further extends so as to pass through the pad through hole602aaof the pad material602a.

The other end portion645bof the guide member645passes between the pad material602aand the airbag module641in the seat front to back direction and extends toward the inside in the seat width direction. Then, the other end portion645bis attached to the back surface of the inside portion in the seat width direction of the side portion602B of the pad material602a.

Specifically, the other end portion645bof the guide member645is attached to the back surface of the pad material602aby the attachment member645c(specifically, an attachment pin).

At this time, a pad high-hardness portion602chigher in hardness than the pad material602ais provided at the part of the back surface of the pad material602athat faces the other end portion645b.

The pad high-hardness portion602cis molded integrally with the pad material602aon the back surface of the pad material602a.

By providing the guide member645as described above, it is possible to suitably guide the deployment direction of the side portion602B of the seat back602when the airbag is inflation-deployed.

In addition, the guide member645can be easily attached by providing the attachment member645cand the pad high-hardness portion602c.

Modification Example 2 of Retainer Member

Next, Modification Example 2 of the retainer member670will be described with reference toFIG.21.

The retainer member670of Modification Example 2 is a holding member having a substantially C-shaped cross section and holding the airbag module641from a seat lateral side and is attached to the side frame621.

The retainer member670has the rear wall portion671disposed on the seat rear side of the side frame621, the folded-back wall portion672formed by folding back the right end portion of the rear wall portion671and sandwiching the rear end portion (rear flange portion621c) of the side frame621, the side wall portion673bent from the left end portion of the rear wall portion671and extending to the seat front along sides of the airbag module641and the side frame621, and a front wall portion676bent from the front end portion of the side wall portion673and protruding to the inside in the seat width direction.

The retainer member670is attached to the side frame621from the outside in the seat width direction and is attached so as to sandwich a part (rear flange portion621c) of the side frame621.

The retainer member670is disposed between the side frame621and the airbag module641in the seat width direction.

Specifically, the retainer member670(side wall portion673) is fastened together with the side frame621by the assembly shaft644aprovided on the inflator644and protruding from the inflator644toward the inside in the seat width direction.

The retainer member670further has the reinforcement portion674attached to the connection part between the side wall portion673and the front wall portion676and protruding from the side wall portion673to the inside in the seat width direction.

The reinforcement portion674is a reinforcement rib (screen portion) having a substantially triangular section and disposed at a position corresponding to the airbag module641.

Specifically, the reinforcement portion674is disposed at a position overlapping the airbag module641in the seat front to back direction and the up to down direction (the same position) and protrudes in a direction away from the airbag module641.

The reinforcement portion674is disposed at a position close to the inflation deployment starting point positions of the airbags642and643.

By providing the retainer member670as described above, it is possible to suitably receive pressure entailed by the inflation deployment of the airbags642and643.

Eighth Embodiment of Conveyance Seat

Next, a conveyance seat S8of an eighth embodiment will be described with reference toFIG.22.

It should be noted that description of content overlapping with the conveyance seats S1to S7described above will be omitted.

The conveyance seat S8includes a seat main body having a seat back702, side support members730, a side airbag device740, and a guide member780disposed between the side support member730and a side frame721in the seat front to back direction and guiding the inflation deployment directions of airbags742and743.

The side support members730are L-shaped linear members (specifically, wire members) and are attached by welding to the seat front parts of the right and left side frames21.

The side airbag device740includes an airbag module741having the first airbag742, the second airbag743, and an inflator744.

It should be noted that the side airbag device740may have only the first airbag742without having the second airbag743.

The guide member780is a plate-shaped member elongated in the up to down direction, is attached to the side support member730, and is disposed so as to cover the gap between the side support member730and the side frame721in the seat front to back direction.

Specifically, the guide member780is hooked on the side support member730by a plurality of attachment members (for example, attachment clips), which are not illustrated.

It should be noted that the guide member780may be attached to, for example, the side frame721.

By providing the guide member780as described above, it is possible to suitably guide the inflation deployment direction of the side portion of the seat back702when the airbag is inflation-deployed. As a result, the airbag can be deployed with speed.

In addition, the guide member780can be easily attached using the side support member730.

Although a vehicle seat used in an automobile has been described as a specific example in the above embodiments, the present invention is not particularly limited and can also be used for various seats such as two-wheeled seats for two-wheeled vehicles, seats for vehicles such as trains and buses, and seats for conveyances such as airplanes and ships.

In the above embodiments, the conveyance seat according to the present invention has been mainly described.

However, the above embodiments are merely examples for facilitating understanding of the present invention and do not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and it is a matter of course that the present invention includes equivalents thereof.

REFERENCE SIGNS LIST