Vehicle seats

Abstract

To provide a vehicle seat with improved mounting rigidity of the upper part that pushes up the seat cushion. [Solution] The vehicle seat S comprises a seat cushion 1, a seat back 2, and a back frame 20 which forms the skeleton of the seat back 2. The seat back 2 is mounted so as to be rotatable in the front-rear direction of the seat. The back frame 20 has a pair of side frames 21, 21 spaced apart in the seat width direction, a cross member 24 mounted on the pair of side frames 21, 21, and a push-up part 31 which lifts the seat cushion 1 when the seat back 2 is tilted backward. The push-up part 31 is fixed to the cross member 24.

Description

Technical Field

[0001] The present invention relates to a vehicle seat, and particularly to a vehicle seat capable of reclining a seat back to a full flat state.

Background Art

[0002] Conventionally, a vehicle seat equipped with a reclining device capable of reclining a seat back to a full flat state is known. In Patent Document 1, a pressing portion (referred to as a claw portion in Patent Document 1) is provided at the lower end of the seat back, and a structure for raising the rear end portion of the seat cushion by the pressing portion during reclining is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When in the full flat state, a larger load of the occupant than normal may be applied to the rear end portion of the seat cushion. Therefore, the pressing portion for raising the rear end portion of the seat cushion is required to have a stronger mounting rigidity so as to support the load from the occupant.

[0005] An object of the present invention is to provide a vehicle seat in which the mounting rigidity of a pressing portion for pushing up a seat cushion is improved.

Means for Solving the Problems

[0006] The aforementioned problems are solved by the vehicle seat of the present invention, which comprises a seat cushion, a seat back, and a back frame that forms the skeleton of the seat back, wherein the seat back is mounted so as to be rotatable in the front-rear direction of the seat, and the back frame has a pair of side frames spaced apart in the seat width direction, a cross member mounted on the pair of side frames, and a pressing part that lifts the seat cushion when the seat back is tilted backward, wherein the pressing part is fixed to the cross member. By fixing the upper part of the pusher to the cross member, the upper part of the pusher can be attached to the vehicle seat more securely. Therefore, it is possible to provide a vehicle seat with improved mounting rigidity of the upper part that pushes up the seat cushion.

[0007] The cross member preferably has a rear cross member located behind the upper part when the seat back is in an upright position, and the upper part is fixed to the rear cross member. By fixing the upper part of the pusher to the rear cross member located at the rear, the mounting rigidity of the upper part of the pusher can be improved.

[0008] In the above configuration, the cross member preferably has a front cross member located in front of the rear cross member when the seat back is in an upright position, and the pressing portion is fixed to the front cross member. By fixing the upper part of the pusher to the front cross member, it is possible to receive loads from, for example, the seating surface side of the seat back together with the front cross member, thereby improving the mounting rigidity of the upper part of the pusher.

[0009] Furthermore, in the above configuration, it is preferable that the pressing portion is sandwiched and fixed between the front cross member and the rear cross member. The upper part of the push-up section is sandwiched and fixed between the front cross member and the rear cross member, allowing for a more secure fixation and further improving the mounting rigidity of the upper part of the push-up section.

[0010] In the above configuration, the pressing portion is provided with a through hole that penetrates in the sheet width direction, and the pressing portion is fixed to the rear cross member by inserting the rear cross member through the through hole. By inserting the rear cross member through the through hole in the upper part, the upper part and the cross member are integrated, further improving mounting rigidity.

[0011] In the above configuration, the rear cross member is composed of a first rear cross member and a second rear cross member, and the pressing portion has a first through hole through which the first rear cross member is inserted and a second through hole through which the second rear cross member is inserted, and when the seat back is upright, the first through hole and the second through hole are preferably positioned far apart from each other in the front-rear direction of the seat. Because the first and second through-holes are positioned far apart, the load on the first and second rear cross members is distributed, thereby improving mounting rigidity.

[0012] In the above configuration, the first rear cross member is formed in a pipe shape with a hollow interior, and a notch is formed in the wall of the first through hole. The pressing portion is fixed to the first rear cross member by inserting a fitting member into the notch. The first rear cross member is fixed to the pressing surface by the fitting member, which suppresses the first rear cross member from sliding relative to the pressing surface and improves mounting rigidity.

[0013] In the above configuration, the seat back has a reclining axis that serves as the rotation center, and when the seat back is in the upright position, the reclining axis is preferably located in front of the front cross member. By positioning the reclining axis in front of the front cross member, the mounting rigidity around the front cross member is improved, which in turn improves the mounting rigidity of the press-fit part attached to the front cross member.

[0014] In the above configuration, the seat cushion comprises a seat cushion body, a support base that supports the seat cushion body from below, a storage compartment located below the seat cushion body, and a rotating part that rotates the end of the seat cushion body upward. The seat cushion body is configured to be switchable between a normal state in which an occupant can sit and an unfolded state in which the end of the seat cushion body is rotated upward to expose the storage compartment. The upper part of the pusher is intended to lift the seat cushion body by pushing up the support base when the seat back is tilted backward. By pushing up the support base, the entire seat cushion can be easily raised, allowing it to be easily made fully flat.

[0015] In the above configuration, the pressing portion may have a rotating portion in the part of the seat cushion that comes into contact with the support base. By providing a rotating part in the portion that contacts the support base, it can slide on the support base and push up the seat cushion without getting caught.

[0016] In the above configuration, it is preferable that the support base has a groove formed in a position that contacts the pressing part into which the pressing part is inserted. The grooves guide the movement of the pressing part while suppressing movement in the sheet width direction, allowing for a smoother transition to a fully flat state, and also ensuring that the position of the pressing part remains stable after lifting.

[0017] In the above configuration, a side airbag device is provided, and the side airbag device is preferably positioned above the connection between the cross member and the side frame in at least one of the pair of side frames. By incorporating side airbags, safety is improved, and by positioning the side airbags above the connection points, the vehicle can be made more compact. [Effects of the Invention]

[0018] According to the present invention, by fixing the pressing part to the cross member, the pressing part can be more firmly attached to the vehicle seat. Therefore, it is possible to provide a vehicle seat in which the mounting rigidity of the pressing part for pushing up the seat cushion is improved. Further, according to the present invention, by fixing the pressing part to the rear cross member, the mounting rigidity of the pressing part can be improved. Further, according to the present invention, by fixing the pressing part to the front cross member, for example, a load applied from the seating surface side of the seat back can be received together with the front cross member, and the mounting rigidity of the pressing part can be improved. Further, according to the present invention, by fixing the pressing part to the front cross member, for example, a load applied from the seating surface side of the seat back can be received together with the front cross member, and the mounting rigidity of the pressing part can be improved. Further, according to the present invention, when the rear cross member is inserted through the through hole of the pressing part, the pressing part and the cross member are integrated, and the mounting rigidity can be further improved. Further, according to the present invention, since the first through hole and the second through hole are arranged apart from each other, the loads applied to the first rear cross member and the second rear cross member are dispersed, thereby improving the mounting rigidity. Further, according to the present invention, by fixing the first rear cross member to the pressing part by the fitting member, the first rear cross member is suppressed from sliding with respect to the pressing part, and the mounting rigidity is improved. Further, according to the present invention, since the reclining shaft is located in front of the front cross member, the mounting rigidity around the front cross member is improved, and thereby the mounting rigidity of the pressing part attached to the front cross member is also improved. Further, according to the present invention, by pushing up the support base, the entire seat cushion can be easily pushed up and easily set in a full flat state. Further, according to the present invention, by providing a rotating part at a portion that abuts against the support base, it is possible to slide on the support base and push up the seat cushion without being caught. Also, according to the present invention, the groove portion guides the moving direction of the pushing-up portion and suppresses the movement in the sheet width direction. Therefore, the transition to the full flat state can be performed more smoothly, and the position of the pushing-up portion becomes stable even after being lifted. Also, according to the present invention, by providing the side airbag device, the safety is improved, and by arranging the side airbag device at a position above the connecting portion, it can be made more compact.

Brief Description of the Drawings

[0019] [Figure 1] It is a perspective view of the vehicle seat of the present embodiment seen from obliquely rearward. [Figure 2] It is a perspective view showing the back frame. [Figure 3] It is a front view showing the back frame. [Figure 4] It is a perspective view showing the pushing-up device having the pushing-up portion. [Figure 5] It is a rear view showing the lower part of the back frame. [Figure 6] It is a cross-sectional view taken along line VI-VI of FIG. 3 and shows the configuration of the pushing-up portion. [Figure 7A] It is an explanatory diagram for explaining the operation of the pushing-up portion and shows the state before reclining. [Figure 7B] [[ID=3I]]It is a view showing the reclined state. [Figure 7C] It is a view showing the state where the rear end of the seat cushion is pushed up by the pushing-up portion. [Figure 8] It is a view showing a modified example of the rotating portion. [Figure 9] It is a view showing a modified example of the receiving portion into which the arm portion of the pushing-up portion is inserted.

Embodiments for Carrying Out the Invention

[0020] The configuration of a vehicle seat according to an embodiment of the present invention (this embodiment) will be described below with reference to the drawings. However, the embodiment described below is merely an example to facilitate understanding of the present invention and does not limit the present invention. That is, the present invention can be modified and improved without departing from its spirit, and of course, equivalents thereof are included in the present invention.

[0021] In the following, we will describe a vehicle seat S, which is installed in a vehicle, as an example of a vehicle seat, and explain its configuration. Furthermore, in the following explanation, "seat longitudinal direction" refers to the longitudinal direction of the vehicle seat S, which coincides with the direction of travel when the vehicle is in motion. Also, "seat width direction" refers to the width direction of the vehicle seat S, which coincides with the left-right direction as viewed from the perspective of an occupant seated in the vehicle seat S. Also, "seat vertical direction" refers to the vertical direction of the vehicle seat S, which coincides with the vertical direction when the vehicle is traveling on a horizontal plane. Furthermore, the outer and inner directions are determined based on the occupant seated in the vehicle seat S. That is, the direction towards the center in the width direction of the seat is defined as the inward direction, and the direction away from the center is defined as the outward direction.

[0022] As shown in Figure 1, the vehicle seat S is a seat placed on the floor of the vehicle where the vehicle's occupants sit. In this embodiment, the vehicle seat S is a front seat located at the front of the vehicle, but it may also be used as a rear seat located at the rear. Furthermore, the vehicle seat S can be used as a second-row middle seat or a third-row third seat in a vehicle equipped with three rows of seats in the front-to-rear direction.

[0023] Furthermore, unless otherwise specified, the following descriptions of the shape, position, and orientation of each part of the vehicle seat S will be based on the assumption that the vehicle seat S is in its normal state (a state in which an occupant can sit).

[0024] <Vehicle Seat S> The vehicle seat S according to this embodiment will be described with reference to Figures 1-9. Figure 1 is a perspective view of the vehicle seat S according to this embodiment, seen from the rear at an oblique angle, showing the seat cushion 1 in a forward-extended state. Figure 2 is a perspective view showing the back frame 20 of the vehicle seat S, and Figure 3 is a front view showing the back frame 20. Figure 4 is a perspective view showing the push-up device 6 having a push-up part 31, and Figure 5 is a rear view showing the lower part of the back frame 20. Figure 6 is a cross-sectional view along the line VI-VI in Figure 3, mainly showing the configuration of the push-up part 31. Figures 7A-7C are explanatory diagrams illustrating the operation of the push-up part 31. Figure 8 shows a modified example of the rotating part 35, and Figure 9 shows a modified example of the receiving part 14 into which the arm part 34 of the push-up part 31 is inserted. Note that in Figure 1, for illustrative purposes, a part of the vehicle seat S is shown with the surface T removed and the pad P exposed.

[0025] As shown in Figure 1, the vehicle seat S comprises a seat cushion 1, a seat back 2, a headrest 3, and a reclining device 4. The seat back 2 is also provided with a push-up device 6 having a push-up portion 31. The seat back 2 is mounted so as to be rotatable in the front-rear direction of the seat, and its tilt angle is adjustable. More specifically, the seat back 2 is mounted so as to be rotatable in the front-rear direction of the seat via the side base 13 of the seat cushion 1 and the reclining device 4.

[0026] As will be described in detail later, the seat back 2 is provided with a back frame 20 that forms its framework. The back frame 20 has a pair of side frames 21, 21 that are spaced apart in the seat width direction, and a cross member 24 that is mounted on the pair of side frames 21, 21. The back frame 20 is also provided with a push-up part 31 that lifts the seat cushion 1 when the seat back 2 is tilted backward. The push-up part 31 is fixed to the cross member 24 of the back frame 20. The cross member 24 and the push-up part 31 are sometimes collectively referred to as the push-up device 6.

[0027] Headrest 3 has a pillar supporting it that extends downwards and connects to the upper end of seatback 2. In the following text, seat cushion 1, seatback 2, and headrest 3 may be collectively referred to as the seat body.

[0028] As shown in Figure 1, a sliding device 5 is provided at the bottom of the vehicle seat S, which slides the seat body of the vehicle seat S in the front-to-back direction. The sliding device 5 is positioned vertically between the seat body of the vehicle seat S and the vehicle floor. The sliding device 5 comprises left and right lower rails 5a fixed to the vehicle floor and extending in the front-rear direction of the seat, and left and right upper rails 5b supported so as to be slidable along the lower rails 5a. The sliding device 5 also includes a locking member (not shown) that locks the upper rails 5b so as not to slide relative to the lower rails 5a, and a rail operating lever for releasing the locked state of the locking member. A height linking device for changing the height of the seat body may also be provided on the upper surfaces of the left and right upper rails 5b.

[0029] The vehicle seat S is configured to be adjustable between a "normal state" (see Figure 7A) in which an occupant can sit on the seat cushion 1, and an "unfolded state" in which the rear end of the seat cushion 1 is rotated upward around a cushion rotation part 15 provided at the front end of the seat cushion 1, exposing the storage part 12 as shown in Figure 1. The vehicle seat S can also be moved to a "reclined state" (see Figure 7B) in which the seat back 2 is tilted backward by the reclining device 4. Furthermore, the seat back 2 can be tilted further backward to a "full flat state" (see Figure 7C) in which the seating surface 2a of the seat back 2 and the seating surface 1a of the seat cushion 1 are almost flat.

[0030] <Seat cushion 1> The seat cushion 1 is a support member that supports the buttocks of a seated occupant (hereinafter sometimes referred to as the seated person), and supports the seated person from below. The seat cushion 1 comprises a seat cushion body 10, a support base 11 that supports the seat cushion body 10 from below, a storage compartment 12 provided below the support base 11, and a pair of side bases 13, 13 provided on both sides of the seat cushion 1.

[0031] The seat cushion body 10 is the part in which the occupant sits directly, and consists of a pad P for the seat cushion 1 and a surface covering that covers the pad P. The pad P is made of a urethane base material formed by foam molding using, for example, urethane foam material. The surface covering T is made of, for example, cloth, synthetic leather, or genuine leather.

[0032] The support base 11 is a frame member that supports the seat cushion body 10 from below. A receiving portion 14 is formed on the bottom surface of the support base 11, which the arm portion 34 of the pressing portion 31 contacts. The receiving portion 14 is composed of a groove that extends in the front-rear direction of the seat. The size of the receiving portion 14 in the seat width direction (width of the groove) is formed to match the width of the pressing portion 31. The receiving portion 14 corresponds to the groove of the present invention. Furthermore, a lock release strap 41 extends from the rear end of the support base 11 to release the lock on the rotation of the seat cushion body 10.

[0033] The pair of side bases 13, 13 on the left and right are supported by a front connecting member (not shown) that connects the front portion and a rear connecting member (not shown) that connects the rear portion. The storage section 12 is positioned between the pair of side bases 13, 13. The seat cushion body 10 is rotatably attached to the front end portions of the pair of side bases 13, 13 via a cushion rotating portion 15. That is, the seat cushion body 10 can be raised around the cushion rotating portion 15 as its central axis, allowing the vehicle seat S to be deployed as shown in Figure 1.

[0034] When the vehicle seat S is in its normal state, the seat cushion body 10 is locked from rotating by a locking device. The occupant releases the lock by pulling up the release strap 41.

[0035] In this embodiment, the cushion rotation part 15, which is the pivot point of the seat cushion body 10, is located in front of the seat cushion 1, but the position of the cushion rotation part 15 is not limited to this. The cushion rotation part 15 may be located in the center in the front-rear direction of the seat cushion 1. In this case, the seat cushion body 10 and the support base 11 bend in the center, and only the rear portion of the seat cushion body 10 rotates, causing it to be lifted upward by the pressing part 31.

[0036] <Seatback 2> The seat back 2 is a support part that supports the back of the occupant and supports the occupant from the rear. The seat back 2 consists of a back frame 20 which forms the skeleton, a pad P for the seat back 2 which covers the back frame 20, and a surface T which covers the pad P. As described above, the seat back 2 is also provided with a pressing part 31 which, when reclined backward by the reclining device 4, contacts the rear end of the seat cushion 1, more specifically the receiving part 14, to lift the seat cushion body 10.

[0037] As shown in Figure 2, the back frame 20 is a member formed in a frame shape overall. The back frame 20 mainly consists of a pair of side frames 21, 21 that are spaced apart in the sheet width direction, an upper frame 22 that connects the upper ends of the pair of side frames 21, 21, and a lower frame 23 that connects the lower ends of the side frames. The lower frame 23 is part of the cross member 24, which will be described later, and corresponds to the second rear cross member 26b. In addition, as shown in Figure 5, a plurality of through holes are formed in the lower frame 23.

[0038] A headrest holder 29 is provided at the upper end of the back frame 20, into which a pillar extending from the headrest 3 is inserted. In addition, a pair of S-springs 28 are mounted on the pair of side frames 21, 21 as pressure-receiving members that receive the load from the seated person. The reclining device 4 has a reclining shaft 4a extending in the seat width direction and a spiral spring 4b. The reclining shaft 4a is the rotation center of the seat back 2. The reclining shaft 4a is located at the lower end of the back frame 20 and is the rotation center of the seat back 2. The spiral spring 4b is attached to both ends of the reclining shaft 4a. When the seat back 2 is in the upright position, the reclining shaft 4a is located in front of the front cross member 25.

[0039] <Pushing device 6> The back frame 20 is equipped with a lifting device 6 for lifting the seat cushion 1. As shown in Figure 4, the lifting device 6 consists of a cross member 24 mounted on the side frame 21, a fixing bracket 27 that fixes the cross member 24 to the side frame 21, and a lifting part 31 that is fixed to the cross member 24.

[0040] <Cross Member 24> The cross member 24 is a member that extends in the seat width direction on the underside of the back frame 20 and is mounted on a pair of side frames 21, 21. The cross member 24 consists of a front cross member 25 that is located in front when the seat back 2 is in an upright position (normal state) and a rear cross member 26 that is located behind the front cross member 25. Furthermore, the rear cross member 26 is composed of a first rear cross member 26a and a second rear cross member 26b. The front cross member 25 and the rear cross member 26 are members that extend in the width direction of the seat. The front cross member 25 is made of plate material and has flanges formed on its upper and lower sides. Furthermore, of the rear cross members 26, the first rear cross member 26a is formed in a pipe shape with a hollow interior. Furthermore, the second rear cross member 26b of the rear cross member 26 is formed by the lower frame 23 of the back frame 20, as described above.

[0041] <Fixing bracket 27> The back frame 20 is provided with fixing brackets 27 that secure the front cross member 25 and the first rear cross member 26a of the cross member 24 to the side frame 21. The fixing brackets 27 are connecting parts that connect the cross member 24 and the side frame 21. The fixing bracket 27 is a metal component and is attached to the side frame 21 by fastening members. The fixing bracket 27 mainly consists of an outer fixing bracket 27a positioned on the outside in the seat width direction and an inner fixing bracket 27b positioned inside the outer fixing bracket 27a. The first rear cross member 26a is fixed to the side frame 21 by the outer fixing bracket 27a. The front cross member 25 is fixed to the outer fixing bracket 27a by the inner fixing bracket 27b.

[0042] A spacer 27d is positioned on the inside of the seat at the lower end of the outer fixing bracket 27a. The inner fixing bracket 27b is fixed to the lower end of the outer fixing bracket 27a via the spacer 27d by a fastening member. An L-shaped connecting member 27c is provided on the inner side surface of the inner fixing bracket 27b, and the front cross member 25 is fixed to the inner fixing bracket 27b via the connecting member 27c. In other words, the front cross member 25 is fixed to the side frame 21 by the connecting member 27c, the inner fixing bracket 27b, and the outer fixing bracket 27a.

[0043] Of the cross members 24, the second rear cross member 26b is the lower frame 23 of the back frame 20, as described above. As shown in Figure 5, both ends of the second rear cross member 26b are fixed to the side frame 21 by welding. The method of fixing the second rear cross member 26b is not limited to this, and the second rear cross member 26b may also be fixed to the side frame 21 using fixing brackets 27, similar to the first rear cross member 26a.

[0044] <Oshi part 31> The push-up part 31 is a support member that lifts the seat cushion 1 when the seat back 2 is tilted backward. As described above, the push-up part 31 is fixed to the cross member 24. Fixing it to the cross member 24 improves the mounting rigidity, so that the seat cushion 1 can be lifted stably. In this embodiment, two pressing parts 31 are attached to the cross member 24, but the number of pressing parts 31 that can be attached is not limited to this, and one wide pressing part 31 may be attached to the cross member 24. Also, three or more pressing parts 31 may be attached to the cross member 24. Furthermore, the position of the pressing portion 31 is set between the pair of side frames 21, 21 on the back frame 20 to match the position of the receiving portion 14 on the seat cushion 1, but the position of the pressing portion 31 is not limited to this. The pressing portion 31 may be positioned, for example, outside the pair of side frames 21, 21. In this case, when the seat back 2 is reclined, the pressing portion 31 will lift, for example, the left and right edges of the seat cushion 1.

[0045] The pressing portion 31 is a member formed in an overall J-shape. The pressing portion 31 consists of a front member 32 positioned in front of the seat and a rear member 33 positioned behind the front member 32. Below the rear member 33 is an arm portion 34 that lifts the seat cushion 1, and the arm portion 34 has a bent portion 34a that bends forward. A recess 34b is formed at the tip of the arm portion 34, and a rotating portion 35 is provided in the recess 34b. The arm portion 34 is configured such that when the seat back 2 is reclined, the rotating portion 35 contacts the lower surface of the rear end of the seat cushion 1, or more specifically, a receiving portion 14 formed on the support base 11 that supports the seat cushion body 10.

[0046] The front member 32 and the rear member 33 are joined by a fastening member 38. The front cross member 25 is joined to the front member 32 by a fastening member. In other words, the pressing portion 31 is fixed to the front cross member 25. The push-up portion 31 is also fixed by the rear cross member 26, and as shown in Figure 6, the push-up portion 31 is sandwiched and fixed between the front cross member 25 and the rear cross member 26. Furthermore, as shown in Figure 6, when the seat back 2 is in an upright position, the push-up portion 31 is fixed to the second rear cross member 26b, which is located behind the front member 32 of the push-up portion 31.

[0047] More specifically, the pressing portion 31 has a through hole 36 that penetrates in the sheet width direction. The pressing portion 31 is fixed to the rear cross member 26 by inserting the rear cross member 26 through the through hole 36. More specifically, a first through-hole 36a is formed in the front member 32 so as to penetrate in the sheet width direction. The first rear cross member 26a is inserted through the first through-hole 36a. The first through-hole 36a is formed to match the outer shape of the first rear cross member 26a.

[0048] The first through-hole 36a is formed in the front member 32 and has an opening on the rear side surface of the front member 32. In addition, a notch 36c is formed on the front side surface of the rear member 33 at a position corresponding to the opening of the first through-hole 36a. After the first rear cross member 26a is inserted through the first through-hole 36a, the fitting member 37 is fitted into the notch 36c. This allows the pressing portion 31 to be fixed more firmly to the first rear cross member 26a. As shown in Figure 6, after the fitting member 37 is fitted into the notch 36c, a fixing fastening member 39 may be inserted, and the fitting member 37 may be pressed toward the first rear cross member 26a to secure it more firmly.

[0049] Furthermore, a second through-hole 36b is formed in the pressing portion 31. When the pressing portion 31 is attached, the second rear cross member 26b is inserted through the second through-hole 36b. The second through-hole 36b is formed to match the cross-sectional shape of the second rear cross member 26b. The second through-hole 36b is formed by a recess formed in the rear member 33 and the front member 32. After positioning the second rear cross member 26b in the recess of the rear member 33, the front member 32 is placed over it, and the rear member 33 and the front member 32 are fastened and secured together, thereby allowing the pressing portion 31 to be attached to the second rear cross member 26b.

[0050] Furthermore, the first through-hole 36a and the second through-hole 36b are positioned at separate locations from each other in the front-to-rear direction of the seat. In other words, the first through-hole 36a is offset from the second through-hole 36b in the front-to-rear direction of the seat. Also, when viewing the vehicle seat S with the seat back 2 in the upright position from the front, the first through-hole 36a is positioned so as not to overlap with the second through-hole 36b. By arranging the first through-hole 36a and the second through-hole 36b in this way, the load applied to the first through-hole 36a and the second through-hole 36b is distributed, thereby improving rigidity.

[0051] The inner fixing bracket 27b of the fixing bracket 27 has a through hole 36d for the reclining shaft through which the reclining shaft 4a of the reclining device 4 passes. The reclining shaft 4a of the reclining device, which is the rotation center of the seat back 2, is positioned in front of the front cross member 25 when the seat back 2 is in its normal state (upright state). By positioning the reclining shaft 4a in front of the front cross member 25, the mounting rigidity around the front cross member 25 is improved, and as a result, the mounting rigidity of the push-up part 31 attached to the front cross member 25 is also improved.

[0052] The arm portion 34 of the push-up part 31 is provided with a fastening member 42 for fixing the surface material T or cover member (not shown) placed on the back of the seat cushion 1 to the arm portion 34. By covering the arm portion 34 of the push-up part 31 with the surface material T or cover member, the push-up part 31 is hidden, thereby improving the appearance of the vehicle seat S.

[0053] <Side airbag device 45> A side airbag device 45 is provided on the outer side surface of a pair of side frames 21, 21. The side airbag device 45 is a device provided to mitigate impacts coming from the side of the vehicle. The side airbag device 45 is positioned above the connection point between the cross member 24 and the side frame 21, that is, above the fixing bracket 27 that attaches the cross member 24 to the side frame 21. Providing the side airbag device 45 to the vehicle seat S improves safety. Furthermore, by positioning the side airbag device 45 above the fixing bracket 27 (the connection point between the cross member 24 and the side frame 21), the vehicle seat S can be made more compact.

[0054] In this embodiment, the side airbag device 45 is provided on both of the pair of side frames 21, 21 in the vehicle seat S, but the side airbag device 45 may be provided on either one of the pair of side frames 21, 21. Furthermore, the side airbag device 45 does not have to be provided on the vehicle seat S.

[0055] <Regarding the operation of the push-button part 31> The operation of the push-up part 31 will be explained using Figures 7A to 7C. When the vehicle seat S is in its normal state, the seat back 2 is in an upright position as shown in Figure 7A. The tip of the push-up part 31 (arm portion 34) is pointed downward to match the position of the seat back 2 and is located away from the rear end of the seat cushion 1.

[0056] When the vehicle seat S is moved to a fully flat position, first the seat back 2 is tilted backward in the direction of arrow A, and the vehicle seat S becomes reclined, as shown in Figure 7B. The seat back 2 rotates around the reclining axis 4a. At this time, the push-up part 31 also rotates in conjunction with the seat back 2. Then, the arm portion 34 of the push-up part 31 comes into contact with the rear end of the seat cushion 1. More specifically, the rotating part 35 provided at the tip of the arm portion 34 is inserted into the receiving portion 14 of the seat cushion 1 and comes into contact with the bottom of the receiving portion 14.

[0057] By further tilting the seat back 2 in the direction of arrow B in Figure 7B, the seating surface 2a of the seat back 2 (shown as a dashed line in Figure 7B) becomes horizontal. At this time, the upper part 31 lifts the rear end of the seat cushion 1 in the direction of arrow C in Figure 7C. As a result, the seating surface 1a of the seat cushion 1 also becomes horizontal. The seating surface 2a of the seat back 2 and the seating surface 1a of the seat cushion 1 come together to make the vehicle seat S fully flat. Furthermore, when the pressing part 31 lifts the rear end of the seat cushion 1, the rotating part 35 rotates and slides in the front-rear direction within the groove-shaped receiving part 14. Therefore, compared to the case without the rotating part 35, the arm part 34 slides smoothly along the receiving part 14, making it easy to lift the rear end of the seat cushion 1. In addition, because it is positioned within the groove-shaped receiving part 14, movement of the pressing part 31 in the seat width direction is suppressed. Even when the seat cushion 1 is lifted, the pressing part 31 can stably support the seat cushion 1.

[0058] <Modified example of the rotating part 35> The rotating part 35 provided at the tip of the pressing part 31 in this embodiment has a circular cross-sectional shape, but the cross-sectional shape of the rotating part 35 is not limited to this. For example, as shown in Figure 8, the rotating part 35A may be formed to have a polygonal cross-sectional shape. Although the cross-section of the rotating part 35A shown in Figure 8 is a regular octagon, it may also be a regular pentagon or a regular hexagon. By making the cross-section polygonal, as in the case of the rotating part 35A, it is possible to slide in stages within the receiving part 14. In addition, since the contact area with the receiving part 14 is increased, the mounting rigidity when supporting the rear end of the seat cushion 1 is improved.

[0059] <Modified example of the receiving part 14> In this embodiment, the receiving portion 14 is realized by forming a groove in the support base 11. This is just one example, and a recess 16 may be further formed on the bottom surface of the receiving portion 14A, as shown in Figure 9. When the vehicle seat S is in a fully flat position, the rotating portion 35 of the pressing portion 31 is fitted into the recess 16 of the receiving portion 14A. This fitting suppresses the movement of the pressing portion 31, thereby increasing the stability of the vehicle seat S when it is in a fully flat position. In addition, the receiving portion 14A may be provided with a locking device to restrict the movement of the rotating portion 35 of the pressing portion 31, instead of the recess 16. The locking device can be implemented, for example, using a striker or latch provided within the receiving portion 14A.

[0060] <Method for manufacturing a vehicle seat S> The vehicle seat S is manufactured by a manufacturing method comprising: preparing a seat cushion 1, a seat back 2, a reclining device 4, a back frame 20 having a cross member 24 mounted on the pair of side frames 21, 21 which form the skeleton of the seat back 2 and are spaced apart in the seat width direction, and a push-up part 31 which lifts the seat cushion 1 when the seat back 2 is tilted backward by the reclining device 4; connecting the seat cushion 1 and the seat back 2 via the reclining device 4; and attaching the push-up part 31 to the cross member 24 of the seat back 2.

[0061] In summary, an embodiment of the present invention has been described, with reference to the vehicle seat S mounted on a vehicle, and its configuration example illustrated with figures. However, the present invention is not limited to seats mounted on ground-running vehicles with wheels, such as automobiles and trains, but may also be applied to seats mounted on aircraft, ships, and other vehicles that move on surfaces other than the ground. [Explanation of Symbols]

[0062] S Vehicle seats (seats for vehicles) P Pad T epidermis 1 seat cushion 1a Seating surface 2 seatbacks 2a Seating surface 3 Headrests 4. Reclining device 4a Reclining axis 5. Slide device 5a Lower Rail 5b Upper Rail 6 Push-up device 10 Seat cushion main body 11 Support base 12 Storage compartments 13 Side Base 14, 14A Receiving part 15. Cushion rotating part (rotating part) 16 recesses 20 Backframe 21 Side Frames 22 Upper frame 23 Lower frame 24 Crossmember 25 Front cross member 26 Rear cross member 26a First rear cross member 26b Second rear cross member (lower frame) 27 Fixing bracket 27a External mounting bracket 27b Internal fixing bracket 27c Connecting member 27d Spacer 28 S spring 29 Headrest holder 31 Push-up part 32 Front member 33 Rear member 34 Arm section 34a Bend part 34b recess 35, 35A Rotating part 36 Through holes 36a First through hole 36b Second through hole 36c Notch 36d Through hole for reclining axis 37 Insertion Member 38 Fastening members 39 Fastening members for fixing 41. Unlock strap 42 Fastening members 45 Side airbag system

Claims

1. It is a seat for a vehicle, Seat cushion and, The seatback and, The seat back comprises a back frame which forms the skeleton of the seat back, The aforementioned seat back is mounted so as to be rotatable in the front-to-back direction of the seat. The back frame comprises a pair of side frames spaced apart in the seat width direction, a cross member mounted on the pair of side frames, and a push-up portion that lifts the seat cushion when the seat back is tilted backward. A vehicle seat characterized in that the aforementioned pressing portion is fixed to the cross member.

2. The cross member has a rear cross member located behind the upper part when the seat back is in an upright position. The vehicle seat according to claim 1, characterized in that the pressing portion is fixed to the rear cross member.

3. The aforementioned cross member has a front cross member located in front of the rear cross member when the seat back is in an upright position. The vehicle seat according to claim 2, characterized in that the pressing portion is fixed to the front cross member.

4. The vehicle seat according to claim 3, characterized in that the pressing portion is sandwiched and fixed between the front cross member and the rear cross member.

5. The aforementioned pressing portion has a through hole that penetrates in the sheet width direction. The vehicle seat according to claim 4, characterized in that the rear cross member is inserted through the through hole, thereby fixing the pressing portion to the rear cross member.

6. The aforementioned rear cross member is composed of a first rear cross member and a second rear cross member. The pressing portion has a first through-hole through which the first rear cross member is inserted, and a second through-hole through which the second rear cross member is inserted. The vehicle seat according to claim 5, characterized in that, with the seat back in an upright position, the first through-hole and the second through-hole are positioned at a distance from each other in the front-to-back direction of the seat.

7. The first rear cross member is formed in a pipe shape with a hollow interior. The vehicle seat according to claim 6, characterized in that a notch is formed in the wall of the first through hole, and the pressing portion is fixed to the first rear cross member by inserting a fitting member into the notch.

8. The seat back has a reclining axis that serves as the rotation center of the seat back, The vehicle seat according to claim 3, characterized in that when the seat back is in an upright position, the reclining axis is located in front of the front cross member.

9. The aforementioned seat cushion comprises a seat cushion body, a support base that supports the seat cushion body from below, a storage section below the seat cushion body, and a rotating section that rotates the end of the seat cushion body upward. The seat cushion body is configured to be switchable between a normal state in which an occupant can sit and an unfolded state in which the end of the seat cushion body is rotated upward to expose the storage compartment. The vehicle seat according to claim 1, characterized in that the pressing part pushes up the support base and lifts the seat cushion body when the seat back is tilted backward.

10. The vehicle seat according to claim 9, characterized in that the pressing portion has a rotating portion in the portion of the seat cushion that contacts the support base.

11. The vehicle seat according to claim 10, characterized in that the support base has a groove formed in a position that contacts the pressing part into which the pressing part is inserted.

12. Equipped with side airbags, The vehicle seat according to claim 1, characterized in that the side airbag device is positioned above the connection between the cross member and the side frame in at least one of the pair of side frames.

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