JP7741407B2 - Vehicle seats - Google Patents

Description

The present invention relates to a vehicle seat, and more particularly to a vehicle seat equipped with an airbag device.

In recent years, vehicle seats have been equipped with side airbags to protect occupants in side impacts. Side airbags protect occupants by cushioning and distributing impact loads.

A side airbag provided in a seat back efficiently transmits the inflation energy of the airbag to the seam (tear line) of the cover, causing the seam to rupture in a short time.
For example, in the vehicle seat of Patent Document 1, in order to deploy the airbag without delay, one end of the webbing is sewn together with the skin at a joint, and the other end of the webbing is fixed to the back frame.
Furthermore, for example, in the vehicle seat of Patent Document 2, suspenders (attachment members) having a substantially triangular cross section are provided on the upholstery, and the upholstery is fixed to the cushion pad by engaging the suspenders with clips (engagement members) embedded in hanging grooves of the cushion pad.

Japanese Patent Application Laid-Open No. 2022-033340 JP 2011-069417 A

When fixing a webbing such as that described in Patent Document 1 to a cushion pad together with a surface skin, it is conceivable to fix the webbing to the cushion pad together with the surface skin using an engaging member such as a clip as described in Patent Document 2.
However, when the side airbag deploys, the load of the webbing is applied to the engaging member, which may cause the engaging member to come off the hanging groove of the cushion pad.

The present invention was made in consideration of the above-mentioned problems, and its object is to provide a vehicle seat in which the load applied to the webbing when the airbag deploys can be stably held by a clip.

The object of the present invention is to provide a vehicle seat comprising: a frame; a pad disposed on the frame; a skin covering the pad; an airbag device attached to the frame and having an airbag and an inflator; a guide member provided on an inner surface of the skin at a position corresponding to the airbag device and guiding deployment of the airbag; and an engaging member for hanging the skin on the pad; a first side portion joined to an end portion of the first side portion in the seat width direction, a second side portion joined to an outer end portion of the first side portion in the seat width direction, a first joint portion joining the center portion and the first side portion, and a second joint portion joining the first side portion and the second side portion, the first joint portion being engaged with the engaging member and hung on the pad, a breaking portion being formed in the second joint portion which breaks when the airbag is deployed, a first end portion which is an outer end portion of the guide member in the seat width direction being joined to the first side portion at the breaking portion, and the guide member A second end portion, which is an inner end portion in the seat width direction of the member, is joined to the first side portion at the first joint portion, and a length in the vertical direction from a first upper end to a first lower end of the engaging member is longer than a length in the vertical direction from the first upper end to the first lower end of the guide member at the first end portion, the engaging member being a clip and having a first engaging member and a second engaging member arranged below the first engaging member, and the guide member is arranged at a position corresponding to the height of the chest of an occupant on the seat and engaged with the first engaging member. and a second guide member that is positioned at a position corresponding to the height of the occupant's waist on the seat and that engages with the second engaging member, a hanging groove extending in the vertical direction is formed in the pad, the first engaging member and the second engaging member are positioned at a distance in the vertical direction inside the hanging groove, and the length in the vertical direction from the lower end of the first guide member to the upper end of the second guide member is shorter than the length in the vertical direction from the first upper end to the first lower end of the first guide member .
With the above-described configuration, the load applied to the guide member (webbing) when the airbag is deployed can be stably held by the engaging member (clip) with a simple structure.
In more detail, when the airbag is deployed and a force is applied to the tear line to cut the tear, the guide member is supported by the engaging member. However, since the vertical length from the upper end to the lower end of the engaging member is longer than the vertical length of the outer end of the guide member, the guide member can be stably held by the engaging member.

In this case, the first upper end of the guide member is positioned higher than the first upper end of the engaging member, and the vertical length between the first upper end of the guide member and the first upper end of the engaging member is shorter than the vertical length from the first upper end to the first lower end of the engaging member.
With the above configuration, even if the length of the hanging groove cannot be secured due to design constraints and the engaging member cannot be positioned in an ideal position, the engaging member can stably support the offset load from the guide member.

In this case, the second upper end of the second end of the guide member is preferably positioned above the first upper end of the engaging member, and the second lower end of the second end of the guide member is preferably positioned below the first lower end of the engaging member.
With the above-described configuration, the load acting on the guide member when the airbag is deployed can be more stably held by the engaging member with a simple structure.

In this case , the vertical length from the second upper end to the second lower end of the second engagement member is preferably longer than the vertical length from the third upper end to the third lower end on the outer side in the sheet width direction of the second guide member.
With the above-described configuration, the load acting on the guide member when the airbag is deployed can be more stably held by the engaging member with a simple structure.

In this case , the gas blowing portion of the inflator is positioned closer to the first guide member than to the second guide member, and the length in the vertical direction from the third upper end to the third lower end on the outer side in the seat width direction of the second guide member is longer than the length in the vertical direction from the first upper end to the first lower end.
With the above configuration, the first guide member is located near the high-pressure gas outlet of the inflator, making it easier to cut open the rupture portion, and the second guide member is located away from the high-pressure gas outlet of the inflator, making it easier to cut open the rupture portion by increasing the vertical length of the end portion on the rupture portion side.

In this case , the gas blowing portion of the inflator is positioned closer to the second guide member than to the first guide member, and the length in the vertical direction from the third upper end to the third lower end on the outer side in the seat width direction of the second guide member is longer than the length in the vertical direction from the first upper end to the first lower end.
With the above-described configuration, the second guide member is located in the vicinity of the high-pressure gas ejection port of the inflator, making it easier to cut open the rupture portion.

In this case , the second engagement member has an upper engagement member, an intermediate engagement member arranged below the upper engagement member, and a lower engagement member arranged below the intermediate engagement member, and the length in the vertical direction from the third upper end to the third lower end on the outer side in the sheet width direction of the second guide member is preferably longer than the length in the vertical direction from the first upper end to the first lower end.
With the above configuration, by increasing the number of engaging members that secure the second guide member, which has a long vertical length at the end on the breaking portion side, the load applied to the guide member when the airbag is deployed can be more stably held by the engaging members.
In addition, the first engaging member may have a first clip and a second clip arranged at a predetermined interval inside the hanging groove, and the second engaging member may have a third clip, a fourth clip and a fifth clip arranged at a predetermined interval inside the hanging groove.
The upper end of the gas blowing portion of the inflator may be located higher than the first upper end.
Preferably, an upper end of the inflator is disposed behind the first guide member in a front view of the seat, and a lower end of the inflator is disposed behind the second guide member in a front view of the seat.

According to the present invention, the load applied to the guide member (webbing) when the airbag is deployed can be stably held by the engaging member (clip) with a simple structure.
Furthermore, according to the present invention, even if the length of the hanging groove cannot be secured due to design constraints and the engaging member cannot be positioned in an ideal position, the engaging member can stably support the offset load from the guide member.
Furthermore, according to the present invention, the load applied to the guide member when the airbag is deployed can be more stably supported by the engaging member with a simple structure.
Furthermore, according to the present invention, the broken portion can be easily cut open.
Furthermore, according to the present invention, the broken portion can be more easily cut open.
Furthermore, according to the present invention, the load applied to the guide member when the airbag is deployed can be more stably supported by the engaging member.

1 is a perspective view of a vehicle seat according to an embodiment of the present invention; FIG. 2 is a front view of the seat back with the cover removed. FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. FIG. 10 is a front view of a modified seat back.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to FIGS.
In the following description, the "front-rear direction" refers to the front-rear direction of the vehicle seat, which is the direction that coincides with the direction of travel when the vehicle is traveling. The "seat width direction" refers to the width direction of the vehicle seat, which is the direction that coincides with the left-right direction as seen by an occupant seated in the vehicle seat. The "up-down direction" refers to the up-down direction of the vehicle seat, which is the direction that coincides with the vertical direction when the vehicle is traveling on a horizontal plane.

<Overall seat configuration>
As shown in Fig. 1, the vehicle seat S of this embodiment is a seat that is placed on the vehicle body floor and in which a vehicle occupant sits. In this embodiment, the vehicle seat S is used as a front seat corresponding to the front seat of the vehicle. However, the vehicle seat S is not limited to this, and may also be a rear seat of the vehicle, or may be used as a middle seat in the second row or a rear seat in the third row in a vehicle that has three rows of seats in the front-to-rear direction.

As shown in FIGS. 1 and 2, the vehicle seat S is mainly composed of a seat cushion 1, a seat back 2, a seat body having a headrest 3, and an airbag device 4.
The vehicle seat S is provided with a seat frame F inside. The seat cushion 1 and the seat back 2 have a pad 10 arranged on the seat frame F and a cover 20 covering the pad 10. The seat back 2 also has a webbing 30 (guide member) on the inner surface of the cover 20 (the pad 10 side) at a position corresponding to the airbag device 4.

The pad 10 has a clip 40 (engagement member) for suspending the cover 20. The cover 20 has an attachment member 50 that engages with the clip 40. The cover 20 is fixed to the pad 10 by the attachment member 50 engaging with the clip 40 and suspending it.
Although the clip 40 is exemplified as an engaging member, the present invention is not limited to this, and the skin 20 may be engaged with the pad 10 by a wire member.

As shown in FIG. 1, the seat cushion 1 is a seating portion that supports an occupant from below, and is configured by placing a pad 10 on a cushion frame (not shown) that forms the skeleton of the seat cushion 1, and covering the pad 10 with a skin 20.
The seat back 2 is a backrest portion that supports the back of the occupant from behind, and is configured by placing a pad 10 on a seat frame F (back frame) shown in FIG. 4 that forms the skeleton of the seat back 2, and covering the pad 10 with a skin 20.
The seat back 2 has a back center portion 2a that supports the occupant from behind, and bank portions 2b that support the occupant from the sides.
The headrest 3 is a head support that supports the head of an occupant from behind, and is configured by placing a padding material on a pillar (not shown) that serves as a core material, and covering it with a skin material.

As shown in FIGS. 1, 2 and 4, the airbag device 4 has a known configuration, is attached to the seat frame F, and is disposed inside the bank portion 2b of the seat back 2 and on the inner side of the skin 20.
The airbag device 4 includes an airbag 4a, an inflator 4b that supplies gas to the airbag 4a, a gas outlet 4c that injects gas into the airbag 4a, a case 4d that covers the airbag 4a, the inflator 4b, and the gas outlet 4c, and a fastener 4e that fastens the case 4d to the seat frame F.

As shown in Figure 4, the airbag device 4 is attached to the right side of the seat frame F (outside the vehicle seat S) with fasteners 4e such as bolts, and is housed inside the pad 10. When gas is ejected from the gas outlet 4c by the inflator 4b and the airbag 4a inflates outside the case 4d, the pad 10 ruptures, the skin 20 is cut open, and the airbag 4a deploys outward.

<Pad>
The pad 10 has a cushion portion formed of a foam, and the cushion portion is covered with a surface 20. This foam may be polypropylene bead foam, polyethylene bead foam, polypropylene foam, polyethylene foam, acrylonitrile-styrene foam, ethylene-vinyl acetate copolymer resin, urethane foam, or a combination thereof. In this embodiment, the pad 10 is a urethane pad formed by foam molding using a urethane foaming agent.

As shown in Figure 2, the pad 10 of the seat back 2 is formed with two hanging grooves 10a extending in the seat longitudinal direction and a horizontal hanging groove 10b extending in the seat width direction. The horizontal hanging groove 10b connects the upper ends of the two hanging grooves 10a. Note that this arrangement of the hanging grooves 10a and horizontal hanging grooves 10b is just one example; the horizontal hanging groove 10b may be positioned between the two hanging grooves 10a, forming a roughly H-shape when viewed from the front of the seat.

A number of clips 40 are provided at predetermined intervals inside the hanging groove 10a. As shown in Figure 4, the clips 40 are fixed to the pad 10 by being partially embedded in the bottom of the hanging groove 10a.

As shown in FIG. 4, the pad 10 of the seat back 2 is formed with a housing portion 10c for housing the airbag device 4 and slits 10d for making the pad 10 easier to break.
The accommodation portion 10c is a space that accommodates the airbag device 4 attached to the seat frame F. The slit 10d is a portion that is broken by the airbag 4a that expands from the case 4d.

<Eidermis>
The cover 20 is made of fabric, film, cloth, leather, sheet, or the like, and is attached so as to cover the pad 10 in a stretched state with a predetermined tension.
As shown in Figures 1 and 4, the cover 20 covering the seat back 2 has a central portion 21 covering the front side of the back central portion 2a, a first side portion 22 covering the inner side (occupant side) of the bank portion 2b in the seat width direction, and a second side portion 23 covering the outer side of the bank portion 2b in the seat width direction.
The first side portion 22 is joined to an outer end 21a in the seat width direction of the central portion 21. The second side portion 23 is joined to an outer first side end 22b on the outer side of the first side portion 22 in the seat width direction.

As shown in Figures 1 and 4, the first joint 24 (joint) where the central portion 21 and the first side portion 22 are joined is formed by sewing together the end 21a of the central portion 21 and the inner end 22a of the first side portion.
The second joint 25 (joint portion) where the first side portion 22 and the second side portion 23 are joined is formed by sewing the outer end portion 22b of the first side portion to the front end portion 23a of the second side portion 23. The second joint 25 has a tear line 25a (tear line) that breaks when the airbag 4a is deployed.
The rear end 23 b of the second side portion 23 is connected to a back surface portion 26 that covers the back side of the pad 10 via a wire fastener 27 .

<Rikifu>
The webbing 30 is a guide member that guides the deployment of the airbag 4a. As shown in Figures 1 to 4, the webbing 30 is disposed on the inner surface side (pad 10 side) of the skin 20 at a position corresponding to the airbag device 4.
The webbing 30 has inner webbing (chest webbing 31, waist webbing 34) provided along the first side portion 22, and an outer webbing 37 provided along the second side portion 23. The inner webbing is divided into upper and lower portions, and has the chest webbing 31 (first guide member) located at the height of the occupant's chest, and the waist webbing 34 (second guide member) located below the chest webbing 31 and at the height of the occupant's waist.

The webbing 30, also known as the inner webbing, is made of a material with a smaller tensile elongation than the outer skin 20. In other words, the webbing 30 is made of a sheet-like material with less stretchability than the outer skin 20. As a result, the webbing 30 transmits the force applied when the airbag 4a deploys to the tear line, or rupture portion 25a, thereby facilitating the deployment of the airbag 4a.

As shown in Figures 1 and 2, one end of the webbing 30 in the seat width direction is joined to the first side portion 22 at the breaking portion 25a of the second joint portion 25, and the other end of the webbing 30 in the seat width direction is joined to the first side portion 22 at the first joint portion 24. The webbing 30 is suspended and fixed to the pad 10 together with the upholstery 20 by engaging the attachment member 50 with the clip 40.

The chest webbing 31 is fixed to the cover 20 by sewing together its outer edge in the seat width direction (chest webbing outer edge 32) and the first side outer edge 22b of the first side portion 22 at the second joint 25, and its inner edge in the seat width direction (chest webbing inner edge 33) and the first side inner edge 22a of the first side portion 22 at the first joint 24. Because the attachment member 50 is sewn together with the cover 20, the chest webbing 31 is fixed to the pad 10 by engaging and hanging the attachment member 50 on the clip 40.

The lumbar webbing 34 is fixed to the cover 20 by sewing one end (lumbar webbing outer end 35) in the seat width direction to the first side outer end 22b of the first side portion 22 at the second joint 25, and by sewing the other end (lumbar webbing inner end 36) to the first side inner end 22a of the first side portion 22 at the first joint 24. Because the attachment member 50 is sewn together with the cover 20, the lumbar webbing 34 is fixed to the pad 10 by engaging and hanging the attachment member 50 with the clip 40.

The outer webbing 37 is fixed to the upholstery 20 by sewing together its front end (outer webbing front end 37a) and the front end 23a of the second side portion 23 at the second joint 25, and its rear end (outer webbing rear end 37b) and the rear end 23b of the second side portion 23 at the second joint 25.

When the airbag 4a is inflated by the airbag device 4, the inflation energy of the airbag 4a is transmitted to the webbing 30 via the pad 10. When the chest webbing 31, lumbar webbing 34, and outer webbing 37 receive the inflation energy of the airbag 4a, the inflation energy of the airbag 4a is concentrated on the stitching at the second joint 25 (breaking portion 25a), causing the stitching to sever. The chest webbing 31, lumbar webbing 34, and outer webbing 37 are then separated at the second joint 25, the pad 10 is broken at the slit 10d, and the airbag 4a is deployed outward.

Here, the gas blowing portion 4c of the inflator 4b of the airbag device 4 is positioned closer to the chest webbing 31 than to the waist webbing 34. In other words, the chest webbing 31 is more susceptible to the load from the airbag 4a than the waist webbing 34. Therefore, the breaking portion 25a near the chest webbing 31 is easier to cut open than the breaking portion 25a near the waist webbing 34.

<Clip>
4, the clip 40 is an engaging member having a substantially V-shaped cross section. The clip 40 has a holding portion 40a that holds the mounting member 50. The clip 40 may also have a U-shaped or C-shaped cross section.
The clip 40 is made of resin, such as polyacetal (POM) resin, polypropylene (PP) resin, polyamide (PA) resin, polycarbonate (PC) resin, etc. The clip 40 is preferably made of polyacetal (POM) resin, which has a relatively high strength.

2, a plurality of clips 40 are provided at predetermined intervals inside the hanging groove 10a of the pad 10. The clips 40 are formed integrally with the pad 10 during foam molding, and are attached to the pad 10 in a state where they are embedded inside the pad 10.
The cover 20 and the webbing 30 are fixed to the pad 10 by the attachment member 50 engaging with the clip 40 and hanging at the first joint 24 provided at a position corresponding to the hanging groove 10a. The clip 40 may also be provided in the horizontal hanging groove 10b.

As shown in Figures 1 and 2, in the right bank portion 2b in the seat width direction of the seat back 2, i.e., in the area corresponding to the airbag device 4, the clip 40 has first engagement members (first clip 41, second clip 42) that suspend the chest webbing 31 to the pad 10, and second engagement members (third clip 43, fourth clip 44, fifth clip 45) that are arranged below the first engagement members and suspend the waist webbing 34 to the pad 10.
The chest webbing 31 is engaged with the first clip 41 and the second clip 42 and suspended from the pad 10. The waist webbing 34 is engaged with the third clip 43, the fourth clip 44, and the fifth clip 45, which are positioned below the first clip 41 and the second clip 42, and suspended from the pad 10.

The first clip 41 hangs the upper portion of the inner end 33 of the chest webbing 31 and secures the chest webbing 31 to the pad 10 .
The second clip 42 is provided below the first clip 41 and hangs the lower portion of the inner end 33 of the chest webbing 31 to secure the chest webbing 31 to the pad 10 .

The third clip 43 (upper engagement member) hangs the upper portion of the inner end portion 36 of the lumbar webbing 34 and fixes the lumbar webbing 34 to the pad 10 .
The fourth clip 44 (intermediate engagement member) is provided below the third clip 43 and hangs the central portion in the vertical direction of the inner end portion 36 of the lumbar webbing to secure the lumbar webbing 34 to the pad 10 .
The fifth clip 45 (lower engagement member) is provided below the fourth clip 44 and hangs the lower portion of the inner end 36 of the lumbar webbing to secure the lumbar webbing 34 to the pad 10 .

<Mounting parts>
The mounting member 50 is a hanger having a tip portion formed in an arrowhead shape in cross section, as shown in Fig. 4. The mounting member 50 is made of resin, for example, polypropylene (PP) resin.
The attachment member 50 has a tip portion 50a that is inserted into the holding portion 40a, and a base portion 50b that connects to the epidermis 20. The base portion 50b is sewn together with the epidermis 20 and the chest webbing 31 at the first joint portion 24. The attachment member 50 is indirectly connected to the epidermis 20 via a nonwoven fabric (not shown). One end of the nonwoven fabric is fixed to the epidermis 20 at the first joint portion 24 by sewing, and the other end of the nonwoven fabric is connected to the base portion 50b of the attachment member 50 by sewing.
In this way, the cover 20 and the webbing 30 are fixed to the pad 10 by the tip 50 a of the attachment member 50 engaging with the holding portion 40 a of the clip 40 at the first joint 24 and being hung thereon.

<Arrangement of webbing and clips>
As shown in Figures 2 and 3, the length L1 in the vertical direction from the first upper end 32a to the first lower end 32b at the outer end 32 of the chest webbing 31 is shorter than the length L2 in the vertical direction from the first clip upper end 41a of the first clip 41 to the second clip lower end 42b of the second clip 42.
Therefore, when a force is applied to the breaking portion 25a to cut it open when the airbag 4a is deployed, the length L2 from the upper end 41a of the first clip to the lower end 42b of the second clip is longer than the length L1 from the first upper end 32a to the first lower end 32b, so the chest webbing 31 can be stably held by the first clip 41 and the second clip 42.

3, the first upper end 32a of the chest webbing 31 is positioned higher than the first clip upper end 41a of the first clip 41. The length L3 in the vertical direction between the first upper end 32a and the first clip upper end 41a is shorter than the length L2 in the vertical direction from the first clip upper end 41a of the first clip 41 to the second clip lower end 42b of the second clip 42.
Therefore, the offset load from the chest webbing 31 can be stably supported by the first clip 41 and the second clip 42 .

As shown in FIG. 3, the second upper end 33a of the chest webbing inner end 33 of the chest webbing 31 is positioned above the first clip upper end 41a, and the second lower end 33b is positioned below the second clip lower end 42b.
Therefore, when the clip 40 is embedded in the pad 10, even if the position of the clip 40 shifts due to foam molding of the pad 10, the chest support cloth 31 can be stably held by the first clip 41 and the second clip 42.

The length L4 in the vertical direction from the third upper end 35a to the third lower end 35b at the outer end 35 of the waist webbing 34 is shorter than the length L5 in the vertical direction from the third clip upper end 43a of the third clip 43 to the fifth clip lower end 45b of the fifth clip 45.
Therefore, when a force is applied to the breaking portion 25a to cut it open when the airbag 4a is deployed, the length L5 from the upper end 43a of the third clip to the lower end 45b of the fifth clip is longer than the length L4 from the third upper end 35a to the third lower end 35b, and therefore the waist webbing 34 can be stably held by the third clip 43 and the fifth clip 45.

The length L4 in the vertical direction from the third upper end 35a to the third lower end 35b at the outer end 35 of the waist webbing 34 is longer than the length L1 in the vertical direction from the first upper end 32a to the first lower end 32b at the outer end 32 of the chest webbing 31.
Since the chest webbing 31 is positioned near the gas blowing portion 4c of the inflator 4b, it is easy to cut open the breaking portion 25a of the chest webbing 31. Furthermore, the waist webbing 34, which is positioned away from the gas blowing portion 4c of the inflator 4b, can be made to have the length L4 of the waist webbing outer end 35 longer than the length L1 of the chest webbing outer end 32, making it easy to cut open the breaking portion 25a.

In this way, when the webbing 30 receives the inflation energy of the airbag 4a, the inflation energy can be absorbed by the clips 40 at the first joint 24, via the nonwoven fabric. Since multiple clips 40 are arranged at equal intervals in the vertical direction along the hanging groove 10a, the load can be supported in a balanced manner. It is preferable that the spacing between the clips 40 be 40 mm to 65 mm.

In addition, the first clip 41 and the second clip 42 are within the vertical length range of the chest webbing 31, and the third clip 43, the fourth clip 44, and the fifth clip 45 are within the vertical length range of the waist webbing 34.
In the chest webbing 31, the first upper end 32a at the outer end 32 of the chest webbing is positioned higher than the second upper end 33a at the inner end 33 of the chest webbing, and the first lower end 32b at the outer end 32 of the chest webbing is positioned higher than the second lower end 33b at the inner end 33 of the chest webbing, so that the entire first webbing is positioned at an angle.
At the rear end portion 37b of the outer webbing, the second side portion 23 can receive the inflation energy of the airbag 4a.

<Modification>
Next, a modified example of the vehicle seat S will be described with reference to Fig. 5. Note that the description of the same content as that of the vehicle seat S described above will be omitted.
In the vehicle seat S of the modified example, the gas blowing portion 4c of the inflator 4b of the airbag device 4 is disposed closer to the lumbar webbing 34 than to the chest webbing 31. That is, the lumbar webbing 34 is more likely to receive the load of the airbag 4a than the chest webbing 31. Therefore, the breaking portion 25a near the lumbar webbing 34 is easier to cut open than the breaking portion 25a near the chest webbing 31.

In this way, because the waist webbing 34 is positioned near the gas outlet 4c of the inflator 4b, the chest webbing 31 makes it easier to cut open the tearing portion 25a. Furthermore, by making the length L4 of the waist webbing outer end 35 longer than the length L1 of the chest webbing outer end 32, the waist webbing 34 located close to the gas outlet 4c of the inflator 4b makes it even easier to cut open the tearing portion 25a.

<Manufacturing method>
A method for manufacturing the vehicle seat S will be described.
First, prepare the seat frame F (back frame) of the seat back 2. The airbag device 4 having the airbag 4a and the inflator 4b is attached to the right side surface of the seat frame F with fasteners 4e such as bolts.
Then, the pad 10 is placed on the seat frame F to which the airbag device 4 is attached. At this time, the airbag device 4 is housed in the housing portion 10c of the pad 10.

A skin 20 is prepared, on the inner surface of which a webbing 30 for guiding the deployment of the airbag 4a is provided. The webbing 30 is arranged at a position corresponding to the airbag device 4, and the skin 20 and the webbing 30 are sewn together to attach the webbing 30 to the inner surface of the skin 20.
Then, the pad 10 is covered with the surface 20 to which the webbing 30 is attached, and the surface 20 is hung on the pad 10 via the clip 40.

In the process of suspending the upholstery 20 onto the pad 10 via the clips 40, the first joint 24 of the upholstery 20 is engaged with and suspended by the clips 40, which have a length in the vertical direction from the first clip upper end 41a to the second clip lower end 42b that is longer than the length in the vertical direction from the first upper end 32a to the first lower end 32b at the outer end 32 of the chest webbing of the webbing 30.

The skin 20 has a central portion 21 that covers the back central portion 2a, which is the central portion of the pad 10 in the seat width direction, a first side portion 22 that is joined to the end portion 21a of the central portion 21 in the seat width direction, a second side portion 23 that is joined to the first side outer end portion 22b of the first side portion 22 in the seat width direction, a first joint portion 24 that joins the central portion 21 and the first side portion 22, and a second joint portion 25 that joins the first side portion 22 and the second side portion 23.
The first joint portion 24 is engaged with a clip 40 and hung on the pad 10, and the second joint portion 25 is formed with a breaking portion 25a that breaks when the airbag 4a is deployed.
The outer end 32 of the chest webbing 30 is joined to the first side portion 22 at the breaking portion 25 a, and the inner end 33 of the chest webbing 30 is joined to the first side portion 22 at the first joining portion 24 .

The gas blowing portion 4c of the inflator 4b is preferably disposed closer to the chest webbing 31 than to the waist webbing 34.
Furthermore, the gas blowing portion 4c of the inflator 4b may be disposed closer to the waist webbing 34 than to the chest webbing 31.

Furthermore, the first upper end 32a is positioned higher than the first clip upper end 41a, and the vertical length between the first upper end 32a and the first clip upper end 41a is preferably shorter than the vertical length from the first clip upper end 41a to the second clip lower end 42b.
In addition, the second upper end 33a is preferably positioned above the first clip upper end 41a, and the second lower end 33b is preferably positioned below the second clip lower end 42b.
Furthermore, it is preferable that the vertical length from the third clip upper end 43a to the fifth clip lower end 45b be longer than the vertical length from the third upper end 35a to the third lower end 35b.
Furthermore, it is preferable that the length in the vertical direction from the third upper end 35a to the third lower end 35b be longer than the length in the vertical direction from the first upper end 32a to the first lower end 32b.

The manufacturing method of the vehicle seat S described above is as follows.
A method for manufacturing a vehicle seat,
Prepare the frame,
an airbag device having an airbag and an inflator attached to the frame;
A pad is placed on the frame;
a skin having a guide member on an inner surface thereof for guiding the deployment of the airbag;
the guide member is disposed at a position corresponding to the airbag device, and the pad is covered with the skin;
suspending the skin onto the pad via an engagement member;
the skin has a central portion covering a central portion of the pad in the seat width direction, a first side portion joined to an end portion of the central portion in the seat width direction, a second side portion joined to an outer end portion of the first side portion in the seat width direction, a first joint portion joining the central portion and the first side portion, and a second joint portion joining the first side portion and the second side portion,
the first joint portion is engaged with the engaging member and suspended from the pad;
The second joint portion has a breaking portion formed therein that breaks when the airbag is deployed,
a first end portion, which is an outer end portion in the sheet width direction of the guide member, joined to the first side portion at the breaking portion;
a second end portion of the guide member that is an inner end portion in the sheet width direction is joined to the first side portion at the first joint portion;
The method for manufacturing a vehicle seat includes suspending the upholstery onto the pad via the engaging member by engaging the first joint portion of the upholstery with the engaging member, the engaging member having a length in the vertical direction from the first upper end to the first lower end that is longer than the length in the vertical direction from the first upper end to the first lower end at the first end of the guide member.

In the above embodiment, a vehicle seat used in an automobile was described as a specific example, but the present invention is not limited to this and can be used for a variety of seats, including motorcycle seats, vehicle seats for trains and buses, seats for vehicles such as airplanes and ships, as well as office chairs, wheelchairs, and child seats in shopping carts.

In the present embodiment, the vehicle seat according to the present invention has been mainly described.
However, the above embodiment is merely an example for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof.

S Vehicle seat F Seat frame (frame)
REFERENCE SIGNS LIST 1 seat cushion 2 seat back 2a back center portion 2b bank portion 3 headrest 4 airbag device 4a airbag 4b inflator 4c gas blowing portion 4d case 4e fixing device 10 cushion pad (pad)
10a Hanging groove 10b Horizontal hanging groove 10c Storage portion 10d Slit 20 Cover 21 Central portion 21a End portion of central portion 22 First side portion 22a First side portion inner end portion 22b First side portion outer end portion (outer end portion)
23 Second side part 23a Front end part 23b Rear end part 24 First joint part 25 Second joint part 25a Broken part 26 Outer skin back part 27 Wire fastener 30 Wear cloth 31 Chest cloth (guide member, first guide member)
32 Outer end of chest cloth (first end)
32a First upper end 32b First lower end 33 Inner end of chest cloth (second end)
33a Second upper end portion 33b Second lower end portion 34 Waist cloth (second guide member)
35 Outer end of waist webbing 35a Third upper end 35b Third lower end 36 Inner end of waist webbing 37 Outer webbing 37a Front end of outer webbing 37b Rear end of outer webbing 40 Clip 40a Holding part 41 First clip (engaging member, first engaging member)
41a: First clip upper end (first upper end)
42 Second clip (engagement member, first engagement member)
42b Second clip lower end (first lower end)
43 Third clip (second engaging member, upper engaging member)
43a: Third clip upper end (second upper end)
44 Fourth clip (second engaging member, intermediate engaging member)
45 Fifth clip (second engaging member, lower engaging member)
45b Fifth clip lower end (second lower end)
50 Mounting portion 50a Tip portion 50b Base end portion

Claims (10)

A vehicle seat,
The frame and
a pad disposed on the frame;
a skin covering the pad;
an airbag device attached to the frame and having an airbag and an inflator;
a guide member provided on the inner surface of the skin at a position corresponding to the airbag device, the guide member guiding the deployment of the airbag;
an engaging member that suspends the cover onto the pad,
the skin has a central portion covering a central portion of the pad in the seat width direction, a first side portion joined to an end portion of the central portion in the seat width direction, a second side portion joined to an outer end portion of the first side portion in the seat width direction, a first joint portion joining the central portion and the first side portion, and a second joint portion joining the first side portion and the second side portion,
the first joint portion is engaged with the engaging member and suspended from the pad;
The second joint portion has a breaking portion formed therein that breaks when the airbag is deployed,
a first end portion, which is an outer end portion in the sheet width direction of the guide member, joined to the first side portion at the breaking portion;
a second end portion of the guide member that is an inner end portion in the sheet width direction is joined to the first side portion at the first joint portion;
a length in the up-down direction from a first upper end to a first lower end of the engaging member is longer than a length in the up-down direction from a first upper end to a first lower end of the first end portion of the guide member,
the engaging member is a clip and includes a first engaging member and a second engaging member disposed below the first engaging member;
the guide member is disposed at a position on the seat corresponding to the height of the occupant's chest and includes a first guide member that engages with the first engagement member, and a second guide member that is disposed at a position on the seat corresponding to the height of the occupant's waist and engages with the second engagement member,
The pad has a hanging groove extending in the vertical direction,
the first engaging member and the second engaging member are disposed in the hanging groove and spaced apart from each other in the up-down direction,
A vehicle seat characterized in that the vertical length from the lower end of the first guide member to the upper end of the second guide member is shorter than the vertical length from the first upper end to the first lower end of the first guide member . the first upper end of the guide member is disposed above the first upper end of the engagement member,
2. The vehicle seat according to claim 1, wherein the vertical length between the first upper end of the guide member and the first upper end of the engagement member is shorter than the vertical length from the first upper end to the first lower end of the engagement member. a second upper end of the guide member at the second end portion is disposed above the first upper end of the engagement member;
2. The vehicle seat according to claim 1, wherein a second lower end of the second end portion of the guide member is positioned lower than the first lower end of the engagement member. 4. The vehicle seat according to claim 1, wherein the vertical length from the second upper end to the second lower end of the second engagement member is longer than the vertical length from the third upper end to the third lower end on the outer side in the seat width direction of the second guide member. a gas blowing portion of the inflator is disposed closer to the first guide member than to the second guide member;
4. The vehicle seat according to claim 1, wherein the length in the up-down direction from a third upper end to a third lower end on the outer side in the seat width direction of the second guide member is longer than the length in the up-down direction from the first upper end to the first lower end. a gas blowing portion of the inflator is disposed closer to the second guide member than to the first guide member;
4. The vehicle seat according to claim 1, wherein the length in the up-down direction from a third upper end to a third lower end on the outer side in the seat width direction of the second guide member is longer than the length in the up-down direction from the first upper end to the first lower end. the second engagement member includes an upper engagement member, an intermediate engagement member disposed below the upper engagement member, and a lower engagement member disposed below the intermediate engagement member ,
4. The vehicle seat according to claim 1, wherein the length in the up-down direction from a third upper end to a third lower end on the outer side in the seat width direction of the second guide member is longer than the length in the up-down direction from the first upper end to the first lower end. The first engaging member has a first clip and a second clip provided at a predetermined interval inside the hanging groove,
2. The vehicle seat according to claim 1, wherein the second engagement member includes a third clip, a fourth clip, and a fifth clip that are provided at predetermined intervals inside the hanging groove. 2. The vehicle seat according to claim 1, wherein an upper end of the gas blowing portion of the inflator is disposed higher than the first upper end. an upper end portion of the inflator is disposed behind the first guide member in a front view of the seat;
2. The vehicle seat according to claim 1, wherein a lower end portion of the inflator is disposed rearward of the second guide member in a front view of the seat.