JP2023106233A - Vehicle seat device - Google Patents

Abstract

A vehicle seat device capable of effectively absorbing an external force transmitted from an object to the headrest due to the collision when the rear part of the headrest collides with the object positioned immediately behind the headrest. A first metal frame (21) which is a frame member of a headrest (20) and has a pair of left and right side constituent portions (23) and a first support portion (22) connecting upper end portions of the pair of side constituent portions. , a first foam member 25 attached to a first metal frame and made of EPP, and a second foam member attached to the first foam member so as to cover at least the front surface of the first foam member and being softer than the first foam member. 45, and assuming an imaginary plane PL that contacts the rear ends of the pair of side components and the rear end of the first support, at least the rear projection 39 that is a part of the first foam material A part is positioned behind the virtual plane. [Selection drawing] Fig. 8

Description

The present invention relates to a vehicle seat device.

Patent Documents 1 and 2 below disclose a vehicle seat device having a headrest.

JP-A-2006-6823 JP 2012-11827 A

It is assumed that the vehicle seat devices of Patent Literatures 1 and 2 are mounted, for example, in the cabin of a truck. A vehicle seat device is usually provided immediately in front of a wall forming the rear surface of the cabin of a truck. Therefore, when the truck is rear-ended, the rear portion of the headrest of the vehicle seat device may collide with the wall.

The headrests of Patent Documents 1 and 2 have room for improvement in terms of impact absorption in such cases.

In consideration of the above facts, the present invention provides a vehicle seat device in which, when the rear portion of the headrest collides with an object located immediately behind the headrest, the headrest can effectively absorb the external force transmitted from the object to the headrest due to the collision. The purpose is to obtain

According to a first aspect of the present invention, there is provided a vehicle seat device, which is a frame member of a headrest, and includes a pair of left and right side structure portions and a first support portion connecting upper end portions of the pair of side structure portions. a first foam member made of EPP attached to the first metal frame and attached to the first foam member so as to cover at least a front surface of the first foam member; and a second foam material that is softer than the first foam material. At least a portion of the rearward projecting portion, which is part of the material, is located rearward from the imaginary plane.

For example, when a vehicle equipped with the vehicle seat device according to claim 1 is rear-ended, the rear portion of the headrest may collide with an object located immediately behind the headrest. In this case, at least a part of the rear protruding portion, which is located behind the imaginary plane contacting the rear ends of the pair of side structure portions of the first metal frame and the rear end of the first support portion, may be damaged due to the collision. It absorbs the external force transmitted from the object to the headrest. The cushioning properties of the first foam made of EPP (Expanded Polypropylene) are superior to those of the second foam. Therefore, when the rear portion of the headrest of the vehicle seat device according to claim 1 collides with an object located immediately behind the headrest, the headrest can effectively absorb the external force transmitted from the object to the headrest due to the collision. .

The vehicle seat device according to the invention of claim 2 is the vehicle seat device of claim 1, wherein the first foam material has an uncovered portion where the rear surface is not covered with the second foam material. .

In the vehicle device according to claim 2, when the rear part of the headrest collides with an object located immediately behind the headrest, the external force transmitted from the object to the headrest due to the collision is transferred to the first foam material (non-coated part). ) is easily absorbed.

According to a third aspect of the invention, there is provided a vehicle seat device according to the first or second aspect of the invention, which is a frame member of the seat back, and has a second support member extending in the vehicle width direction at the upper end portion. a second metal frame having a portion, wherein the first metal frame is fixed to the second metal frame, and the first foam member has a first cover portion covering the rear surface of the second support portion;

The first foam member of the vehicle seat device according to claim 3 has a first cover portion that covers the rear surface of the second support portion of the second metal frame. Therefore, when the rear portion of the seatback collides with an object located immediately behind the seatback, the first cover portion of the first foam material absorbs the external force transmitted from the object to the seatback due to the collision.

The vehicle seat device according to the invention of claim 4 is the vehicle seat device according to any one of claims 1 to 3, wherein the first foam material is a front surface of the first metal frame. and a protrusion that contacts the rear surface of the first metal frame.

In the vehicle seat device according to claim 4, the front contact portion of the first foam material and the projection sandwich the first metal frame in the longitudinal direction. Therefore, the first foam material is less likely to fall off from the first metal frame.

The vehicle seat device according to the invention of claim 5 is the vehicle seat device according to any one of claims 1 to 4, wherein a recess is formed in the rear surface of the first foam material, and the A second foam member has a second cover portion located in the recess.

A concave portion is formed in the rear surface of the first foam member of the vehicle seat device according to claim 5 . Therefore, the total amount of EPP that constitutes the first foam material can be reduced compared to the case where the concave portion is not formed.

The vehicle seat device according to the invention of claim 6 is the vehicle seat device according to any one of claims 1 to 4, wherein the first foam material is a front surface of the first metal frame. and a second component that contacts the rear surface of the first support and is fixed to the first component.

According to a sixth aspect of the present invention, the first foam member of the vehicle seat device has a second component that contacts the rear surface of the first support and is fixed to the first component. Therefore, when the rear portion of the headrest collides with an object positioned immediately behind the seat back, the second constituent portion of the first foam material makes it difficult for the external force transmitted from the object to the headrest due to the collision to be transmitted to the first support portion. can.

As described above, according to the vehicle seat device of the present invention, when the rear portion of the headrest collides with an object located immediately behind the headrest, the headrest absorbs the external force transmitted from the object to the headrest due to the collision. can be effectively absorbed.

1 is a front perspective view of a vehicle seat device according to an embodiment of the present invention; FIG. FIG. 2 is a perspective view of the vehicle seat device shown in FIG. 1 as seen from the rear of the seat back when the cover is removed; FIG. 3 is a front perspective view of the seatback frame and headrest frame shown in FIG. 2 ; FIG. 4 is a rear perspective view of the seatback frame, the headrest frame, and the first foam member fixed to the headrest frame shown in FIG. 3 ; Figure 5 is a front perspective view of the first foam shown in Figure 4; Figure 5 is a rear perspective view of the first foam shown in Figure 4; FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 2; FIG. 3 is a cross-sectional view taken along line 8-8 of FIG. 2; FIG. 3 is a perspective view similar to FIG. 2 of a vehicle seat device according to a first modified example of the present invention; It is the perspective view seen from the back of the 1st foam material of a 1st modification. FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 9; FIG. 3 is a perspective view similar to FIG. 2 of a vehicle seat device according to a second modification of the invention; It is a typical exploded perspective view of the 1st foam material of the 2nd modification, and a headrest frame. 14 is a cross-sectional view along arrows 14-14 of FIG. 12; FIG.

A vehicle seat device 10 (hereinafter referred to as a seat device 10) according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 8. FIG. Note that an arrow FR indicated appropriately in each figure indicates the front direction of the vehicle, an arrow UP indicates the upward direction of the vehicle, and an arrow LH indicates the left side in the vehicle left-right direction (vehicle width direction). Hereinafter, when simply using front-rear, left-right, and up-down directions, front-rear in the vehicle front-rear direction, left and right in the vehicle left-right direction (vehicle width direction), and up and down in the vehicle up-down direction are indicated.

A seat device 10 shown in FIG. 1 is provided in a cabin 100 of a truck, which is an example of a vehicle (not shown). The seat device 10 includes a seat cushion 11 , a seat back 15 whose lower end is connected to the rear end of the seat cushion 11 , and a headrest 20 fixed to the upper end of the seat back 15 . The seat cushion 11 is fixed to the floor (not shown) of the passenger compartment 100 .

The seatback 15 includes a seatback frame (second metal frame) 16, a press felt 18, a portion of the first foam material 25, a portion of the second foam material 45, and a lower portion 13 of a cover (trim) 12, which will be described later. . The seatback frame 16 shown in FIG. 3 is made up of metal pipes. The front shape of the seat back frame 16 is substantially rectangular. Left and right end portions of a pair of upper and lower reinforcing members 15A are connected to left and right side portions of the seat back frame 16, respectively. An upper end portion (second support portion) 17 of the seatback frame 16 extends in the left-right direction. A press felt 18 made of a metal plate is attached to the front surfaces of the upper and lower reinforcing members 15A (see FIG. 2, not shown in FIGS. 3 and 4).

The headrest 20 has a headrest frame (first metal frame) 21, part of the first foam material 25, part of the second foam material 45, and an upper portion 14 of the cover 12, which will be described later.

A headrest frame 21 shown in FIG. 3 is provided inside the headrest 20 . The headrest frame 21 is configured by a metal pipe. The front shape of the headrest frame 21 is substantially U-shaped. A center portion in the left-right direction of the upper end portion (first support portion) 22 of the headrest frame 21 extends in the left-right direction. The left and right side structure portions 23 of the headrest frame 21 extend substantially vertically. The upper end portion 22 connects the upper ends of the left and right side portion forming portions 23 to each other. Lower ends of the left and right side structure portions 23 are fixed to the upper end portion 17 of the seat back frame 16 .

The first foam material 25 shown in FIGS. 4 to 8 is an integrally molded product made of EPP (expanded polypropylene). The first foam material 25 (EPP) is softer than the seatback frame 16 and the headrest frame 21 and harder than the second foam material 45 (urethane). The first foam material 25 is manufactured separately from the seat back frame 16, the headrest frame 21 and the second foam material 45 using a mold (not shown). The first foam member 25 has a front contact portion 26 , an outer peripheral wall 30 and a rear projection portion 39 .

In this specification, that the first foam material 25 is made of EPP means that the material of the first foam material 25 does not contain any material other than EPP, and that the material of the first foam material 25 is EPP. and the inclusion of a trace amount of materials other than EPP. That is, the first foam material 25 may be composed only of EPP, or may be composed of EPP and a small amount of material other than EPP. The same applies to first foam members 25A and 25B, which will be described later.

The front shape of the front contact portion 26 is substantially rectangular. However, the upper end surface of the front contact portion 26 is substantially arc-shaped. The front contact portion 26 has a substantially thin plate shape. Three through holes 27 are formed near the upper end of the front contact portion 26 .

A substantially U-shaped outer peripheral wall 30 is provided on the outer peripheral edge portion of the rear surface of the front contact portion 26 excluding the lower edge portion. That is, the rear surface of the outer peripheral wall 30 is positioned rearward of the rear surface of the front contact portion 26 .

Three retaining protrusions (protrusions) 35 are provided on the upper portion of the inner peripheral surface of the outer peripheral wall 30 . The front surface of each retaining projection 35 is positioned rearward from the rear surface of the front contact portion 26 . The distance between the front surface of the retention projection 35 and the rear surface of the front contact portion 26 when the first foam member 25 is in a free state is slightly larger than the diameter of the headrest frame 21 .

Further, a rear projection 39 is provided on the rear surface of the front contact portion 26 . As shown in FIG. 6 , the rear protrusion 39 is positioned on the inner peripheral side of the outer peripheral wall 30 . A substantially U-shaped mounting groove 38 is formed between the inner peripheral surface of the front portion of the outer peripheral wall 30 and the outer peripheral surface of the front portion of the rear projection portion 39 . The front shape of the mounting groove 38 is substantially the same as the front shape of the portion of the headrest frame 21 excluding the lower end portion. The amount of rearward projection of the rearward projecting portion 39 from the front contact portion 26 and the amount of rearward projection of the outer peripheral wall 30 from the front contact portion 26 are substantially the same. Further, substantially straight ridges (protrusions) 41 are provided on both left and right sides of the outer peripheral surface 40 of the rear protrusion 39 . The front surface of the protrusion 41 is located behind the rear surface of the front contact portion 26 . The distance between the front surface of the protrusion 41 and the rear surface of the front contact portion 26 when the first foam member 25 is in a free state is slightly smaller than the diameter of the headrest frame 21 .

Further, at the lower end of the rearward projecting portion 39, an extension portion (first cover portion) 42 having a thickness in the front-rear direction smaller than that of the portion other than the lower end of the rearward projecting portion 39 and extending downward from the lower end of the outer peripheral wall 30 is provided. It is Further, as shown in FIGS. 5, 6, and 8, the front surfaces of the lower ends of the front contact portion 26 and the rear projection portion 39 form an inclined surface 43 inclined with respect to the vertical direction and the front-rear direction in a side view. .

The first foam material 25 is attached to the headrest frame 21 by the following procedure. First, the first foam member 25 is positioned immediately before the headrest frame 21 while the headrest frame 21 and the mounting groove 38 are opposed to each other in the front-rear direction. Next, the extension part 42 is positioned directly behind the upper end part 17 of the seat back frame 16 via the lower end part of the inner peripheral space of the headrest frame 21 , and the inclined surface 43 is brought into contact with the rear surface of the upper end part 17 . Subsequently, the first foam member 25 is rotated backward about the contact portion between the inclined surface 43 and the upper end portion 17 to rotate the upper portion of the outer peripheral surface of the rear projection portion 39 and the lower surface of each retaining projection 35. The upper portion of the headrest frame 21 is inserted into the mounting groove 38 through the gap. At this time, the left and right side structure portions 23 of the headrest frame 21 move to the mounting grooves 38 while elastically deforming the ridges 41 . Finally, the first foam member 25 is moved downward relative to the seatback frame 16 and the headrest frame 21 to position the retaining protrusions 35 immediately behind the upper portion of the headrest frame 21 .

When the headrest frame 21 is inserted into the mounting groove 38, as shown in FIG. 8, the upper surface of the mounting groove 38 contacts the upper end portion 22 of the headrest frame 21 while elastically deforming. Furthermore, the lower end portion of the inclined surface 43 contacts the upper end portion 17 of the seatback frame 16 while being elastically deformed. Therefore, downward relative movement of the first foam member 25 with respect to the headrest frame 21 is restricted.

Further, as shown in FIG. 7 , the left and right ridges 41 of the first foam material 25 contact the rear surfaces of the left and right side structure portions 23 of the headrest frame 21 while elastically deforming, and the mounting grooves 38 are formed. The bottom surfaces of the left and right sides (rear surfaces of the front contact portions 26) contact the front surfaces of the left and right side component portions 23, respectively. In other words, the left and right side constituent portions 23 are sandwiched between the ridges 41 and the bottom surfaces of the mounting grooves 38 in the front-rear direction. Furthermore, as shown in FIG. 8 , each retaining projection 35 of the first foam member 25 contacts the rear surface of the upper end portion 22 of the headrest frame 21 while elastically deforming, and also contacts the upper bottom surface (front surface) of the mounting groove 38 . The rear surface of the contact portion 26 ) contacts the front surface of the upper end portion 22 . In other words, the upper end portion 22 is sandwiched between the retaining projections 35 and the bottom surface of the mounting groove 38 in the front-rear direction. Therefore, relative movement of the first foam material 25 with respect to the headrest frame 21 in the front-rear direction is restricted.

Further, as shown in FIG. 7 , the left and right side forming portions 23 of the headrest frame 21 are sandwiched between the left and right inner surfaces of the left and right side portions of the mounting groove 38 . Therefore, relative movement of the first foam material 25 in the left-right direction with respect to the headrest frame 21 is restricted.

Furthermore, the rear portion of the rear protrusion 39 passes through the inner peripheral space of the headrest frame 21 rearward. Further, as shown in FIG. 8 , the extension 42 of the first foam member 25 contacts the rear surface of the upper end 17 of the seatback frame 16 . Furthermore, as shown in FIGS. 7 and 8, a virtual plane PL that contacts the rear end of the upper end portion 22 of the headrest frame 21 and the rear ends of the left and right side component portions 23 is assumed. In this case, the rear portion of the outer peripheral wall 30, the retaining projection 35, and the rear portion of the rear projecting portion 39 (including the extension portion 42) are positioned rearward of the imaginary plane PL.

The second foam material 45 shown in FIGS. 2, 7 and 8 is an integrally molded product made of urethane. The second foam material 45 is manufactured separately from the seat back frame 16, the headrest frame 21 and the first foam material 25 using a mold (not shown). The second foam material 45 has a lower component 46 and an upper component 50 .

In this specification, that the second foam material 45 is composed of urethane means that the material of the second foam material 45 does not contain any material other than urethane, and that the material of the second foam material 45 is urethane. and the inclusion of a small amount of materials other than urethane. That is, the second foam material 45 may be composed of only urethane, or may be composed of urethane and a small amount of material other than urethane. The same applies to second foam members 45A and 45B, which will be described later.

The lower component part 46 can cover the front surface of the seatback frame 16 and the press felt 18 , the left and right side surfaces of the seatback frame 16 , the left and right side surfaces of the upper surface of the seatback frame 16 , and the rear surface of the seatback frame 16 . be.

The lateral dimension of the upper constituent portion 50 is smaller than that of the lower constituent portion 46 . The upper component portion 50 includes a front portion 51 , a pair of left and right side portions 52 , and an upper portion 53 . Further, the second foam material 45 is formed with an opening 47 extending over the rear surface of the lower component 46 and the rear surface of the upper component 50 .

The second foam member 45 is attached to the seat back frame 16, the press felt 18 and the first foam member 25, as shown in FIGS. The front surface of the first foam material 25 is covered by the front part 51 of the upper component 50 , the left and right sides of the first foam material 25 are covered by the left and right side parts 52 , and the upper surface of the first foam material 25 is covered by the upper part 53 . covered. Since the upper portion 53 of the second foam member 45 contacts the upper surface of the first foam member 25 in this manner, upward relative movement of the first foam member 25 with respect to the headrest frame 21 is restricted. As shown in FIG. 2, most of the press felt 18 is exposed to the rear of the seat device 10 through the opening 47. As shown in FIG. Also, the entire rear surface of the first foam member 25 is exposed rearward through the opening 47 . That is, the entire rear surface of the first foam material 25 is the uncovered portion 44 that is not covered with the second foam material 45 . As shown in FIGS. 2, 7 and 8, the rear surface of the top of the lower component 46 and the rear surface of the top 53 and sides 52 of the upper component 50 are substantially continuous with the rear surface of the first foam 25. do.

Further, as shown in FIG. 1, the cover 12 made of a flexible material is covered over the entire outer surface of the seat back frame 16, the press felt 18, the first foam material 25 and the second foam material 45 thus integrated. is installed. The cover 12 is a bag-shaped member with an open bottom end. Cover 12 has a lower portion 13 and an upper portion 14 connected to the upper end of lower portion 13 . The upper portion 14 covers the outer surface of the first foam 25 and the upper component 50 , and the lower portion 13 covers the outer surfaces of the seat back frame 16 , the press felt 18 and the lower component 46 .

(Action and effect)
Next, the operation and effects of this embodiment will be described.

For example, when a vehicle in which the seat device 10 is mounted is rear-ended, the rear portion of the headrest 20 may collide with the wall 101 positioned immediately behind the headrest 20 . In the present embodiment, the rear portion of the outer peripheral wall 30, the retaining projection 35, and the rear portion of the rear projection portion 39 (including the extension portion 42) are located behind the imaginary plane PL. Moreover, the entire rear surface of the first foam material 25 is the uncovered portion 44 that is not covered with the second foam material 45 . Therefore, when the headrest 20 collides with the wall 101 , the external force transmitted from the wall 101 to the headrest 20 is absorbed by the outer peripheral wall 30 of the first foam member 25 , the retaining projection 35 and the rear protrusion 39 . EPP (expanded polypropylene), which is the constituent material of the first foam material 25 , is harder than urethane, which is the constituent material of the second foam material 45 . Therefore, the deformation speed of the first foam member 25 when the external force is transmitted from the wall 101 to the first foam member 25 is the deformation speed of the second foam member 45 when the external force is transmitted from the wall 101 to the second foam member 45 Lower. That is, the first foam material 25 deforms more slowly than the second foam material 45 . Therefore, the cushioning properties of the first foam material 25 are superior to those of the second foam material 45 . Therefore, the first foam material 25 can effectively absorb the external force transmitted from the wall 101 to the headrest 20 due to the collision. In other words, compared to the case where the entire rear surface of the first foam material 25 is covered with the second foam material 45, the external force transmitted from the wall 101 to the headrest 20 due to the collision is effectively absorbed by the headrest 20. be.

Furthermore, when a vehicle in which the seat device 10 is mounted is rear-ended, the rear portion of the upper end portion of the seat back 15 may collide with the wall 101 positioned immediately behind the seat back 15 . In this embodiment, the rear surface of the upper end portion 17 of the seatback frame 16 is covered with the extension portion 42 of the first foam material 25 . Therefore, the extension portion 42 of the first foam member 25 can effectively absorb the external force transmitted from the wall 101 to the upper end portion of the seat back 15 due to the collision.

Furthermore, the left and right side structure portions 23 are sandwiched in the front-rear direction by the protrusions 41 and the bottom surface of the mounting groove 38 (the rear surface of the front contact portion 26), and the upper end portion 22 is located between the retaining projection 35 and the bottom surface of the mounting groove 38. (the rear surface of the front contact portion 26) in the front-rear direction. Therefore, even when the seat device 10 collides with the wall 101 , the first foam member 25 is less likely to fall forward from the headrest frame 21 .

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

For example, the present invention may be implemented in the form of a first variant shown in FIGS. 9-11. In the following description of the first modification, members (parts) that are the same as in the above embodiment are denoted by the same reference numerals as in the above embodiment, and detailed description thereof will be omitted.

The first foam material 25A of the seat device 10A of the first modified example is an integrally molded product made of EPP. The first foam member 25A has a front contact portion 26, an outer peripheral wall 30A and a rear projection portion 39. As shown in FIG.

Recesses 30B are formed on the rear surface of both left and right sides of the outer peripheral wall 30A. Therefore, the thickness in the front-rear direction of the left and right side portions of the outer peripheral wall 30A is smaller than the thickness of the upper portion of the outer peripheral wall 30A.

45 A of 2nd foam materials of a 1st modification are integrally molded articles comprised by the urethane. The second foam material 45A has a lower constituent portion 46 and an upper constituent portion 50A.

The upper component part 50A includes a front part 51 covering the front surface of the first foam material 25A, a pair of left and right side parts 52 covering the left and right side surfaces of the first foam material 25A, and an upper part 53 covering the upper surface of the first foam material 25A. and a pair of left and right rear parts (second cover parts) 54 connected to the rear parts of the left and right side parts 52 . Further, the second foam member 45A is formed with an opening 47A extending over the rear surface of the lower component 46 and the rear surface of the upper component 50A.

As shown in FIGS. 9 and 11, the left and right rear portions 54 of the upper component 50A are fitted into the left and right recesses 30B of the first foam member 25A, and the inner ends of the left and right rear portions 54 are positioned rearwardly. It contacts both left and right side surfaces of the projecting portion 39 . That is, the rear surfaces of the left and right side portions of the outer peripheral wall 30A are covered with the rear portion 54 . As shown in FIGS. 9 and 11, the rear surface of the rear projection 39 of the first foam member 25A and the upper rear surface of the outer peripheral wall 30A are the uncovered portions 44A that are not covered with the second foam member 45A. The rear surface of the upper portion of the lower component 46 and the rear surface of the upper portion 53 and the rear portion 54 of the upper component 50 are substantially continuous with the rear surface of the first foam member 25A. Furthermore, although illustration is omitted, the cover 12 is attached to the entire outer surface of the seat back frame 16, the press felt 18, the first foam material 25A and the second foam material 45A.

Since the recess 30B is formed in the outer peripheral wall 30A of the first modified example, the total amount of EPP forming the outer peripheral wall 30A is less than the total amount of EPP forming the outer peripheral wall 30 of the embodiment. Since EPP is generally expensive, the first foam material 25A of the first modified example can be manufactured at a lower cost than the first foam material 25 of the embodiment. Therefore, the seat device 10A of the first modified example can be manufactured at a lower cost than the seat device 10 of the embodiment.

The present invention may also be implemented in the form of a second modification shown in FIGS. 12-14. In the following description of the second modification, members (parts) that are the same as in the above embodiment are denoted by the same reference numerals as in the above embodiment, and detailed description thereof will be omitted.

The first foam member 25B of the seat device 10B of the second modified example has a first constituent portion 25-1 and a second constituent portion 25-2. The first component 25-1 and the second component 25-2 are integrally molded products made of EPP. The first component 25-1 and the second component 25-2 are manufactured separately from each other using a mold (not shown).

The first component portion 25-1 has a front contact portion 26 and an outer peripheral wall 25-1a that is substantially U-shaped in front view and connected to the outer peripheral portion of the front contact portion 26 except for the lower end portion of the rear surface thereof.

The second component portion 25-2 has a base portion 25-2a having substantially the same front shape as the front contact portion 26, and an extension portion 42 connected to the lower end portion of the base portion 25-2a. As shown in FIG. 14, the front surface of the extension portion 42 is formed with a concave surface 42a extending in the left-right direction.

The first component 25-1 separated from the second component 25-2 is attached to the headrest frame 21. As shown in FIG. That is, the inner peripheral surface of the outer peripheral wall 25-1a contacts the outer peripheral surface of the headrest frame 21, and the outer peripheral edge portion of the rear surface of the front contact portion 26 contacts the front surface of the headrest frame 21. As shown in FIG. Further, as shown in FIG. 14, the second component 25-2 covers the rear surface of the headrest frame 21. As shown in FIG. Further, the concave surface 42a of the base portion 25-2a contacts the upper and rear surfaces of the upper end portion 17. As shown in FIG. Further, the rear surface of the outer peripheral wall 25-1a of the first constituent portion 25-1 and the outer peripheral edge portion of the front surface of the base portion 25-2a are adhered. As shown in FIG. 14, the second component 25-2 is located behind the imaginary plane PL.

The second foam material 45B of the second modified example is an integrally molded product made of urethane. The second foam material 45B has a lower constituent portion 46 and an upper constituent portion 50B.

The upper component part 50B includes a front part 51B that covers the front surface of the first foam material 25B, a pair of left and right side parts 52B that cover the left and right side surfaces of the first foam material 25B, and an upper part 53B that covers the upper surface of the first foam material 25B. And prepare. Further, the second foam member 45B is formed with an opening 47B extending over the rear surface of the lower component 46 and the rear surface of the upper component 50B.

As shown in Figures 12 and 14, a second foam member 45B is attached to the seat back frame 16, the press felt 18 and the first foam member 25B. The entire rear surface of the first foam material 25B is exposed rearward through the opening 47B. That is, the entire rear surface of the first foam material 25B (second component part 25-2) is the uncovered part 44B that is not covered with the second foam material 45B. The rear surface of the upper portion of the lower component portion 46 and the rear surface of the upper portion 53B and side portions 52B of the upper component portion 50B are substantially continuous with the rear surface of the first foam member 25B. Further, although not shown, the cover 12 is attached to the entire outer surface of the seat back frame 16, the press felt 18, the first foam material 25B and the second foam material 45B.

In the second modification, the base portion 25-2a of the first foam material 25B covers the rear surface of the headrest frame 21 and the upper end portion 17. As shown in FIG. Therefore, the external force transmitted from the wall 101 to the upper ends of the headrest 20 and the seat back 15 due to the collision can be effectively absorbed by the base portion 25-2a of the first foam material 25B.

The second foam members 45, 45A, 45B may be made of a material other than urethane. However, the constituent material of the second foam members 45, 45A, 45B must be softer than EPP.

The seat devices 10, 10A, and 10B may be configured so that the headrest 20 can move up and down with respect to the seat back 15.

10 10A 10B Vehicle seat device (seat device)
15 seat back 16 seat back frame (second metal frame)
17 upper end (second support)
20 headrest 21 headrest frame (first metal frame)
22 upper end (first support)
23 Side constituent part 25 25A 25B First foam material 25-1 First constituent part 25-2 Second constituent part 26 Front contact part 35 Retaining protrusion (protrusion)
39 rear protrusion 41 ridge (protrusion)
42 extension part (first cover part)
44 44A 44B Uncovered portion 45 45A 45B Second foam material 54 Rear portion (second cover portion)
PL virtual plane

Claims (6)

a first metal frame, which is a frame member of the headrest and has a pair of left and right side constituent portions, and a first support portion connecting upper ends of the pair of side constituent portions;
a first foam member attached to the first metal frame and constructed of EPP;
a second foam material attached to the first foam material to cover at least a front surface of the first foam material and being softer than the first foam material;
with
Assuming a virtual surface contacting the rear ends of the pair of side structure portions and the rear end of the first support portion, at least a portion of the rear projection portion that is a portion of the first foam material A vehicle seat device positioned behind a virtual plane. 2. The vehicle seat device according to claim 1, wherein the first foam material has an uncovered portion whose rear surface is not covered with the second foam material. A second metal frame that is a frame member of the seat back and has a second support portion extending in the vehicle width direction at the upper end,
the first metal frame is fixed to the second metal frame;
The vehicle seat device according to claim 1 or 2, wherein the first foam member has a first cover portion that covers the rear surface of the second support portion. The first foam material is
a front contact portion that contacts the front surface of the first metal frame;
a protrusion contacting the rear surface of the first metal frame;
The vehicle seat device according to any one of claims 1 to 3, comprising: A recess is formed in the rear surface of the first foam material,
The vehicle seat device according to any one of claims 1 to 4, wherein the second foam member has a second cover portion located in the recess. The first foam material is
a first component contacting the front surface of the first metal frame;
a second component that contacts the rear surface of the first support and is fixed to the first component;
The vehicle seat device according to any one of claims 1 to 4, comprising: