Vehicular seat

Abstract

To provide a vehicular seat improved in rigidity of a frame.SOLUTION: A vehicular seat S which comprises a seat cushion 1 and can be bought into a falling-down state in which the seat cushion 1 is fallen down, comprises a cushion frame CF supporting the seat cushion 1. The cushion frame CF has: a first frame 10 supporting the seat cushion 1; and a second frame 20 provided below the first frame 10 to support the first frame 10. The first frame 10 has a first link 16 that is turnably connected to the second frame 20 to make the seat cushion 1 fall down forward. The second frame 20 has a second link 22 that is turnably provided and changes a height of the seat cushion 1. A turning shaft 16b of the first link 16 with respect to the second frame 22 is positioned closer to a front side or a rear side of the seat than a turning shaft 22a of the second link 22 with respect to the second frame 20.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat that can be transformed into a folding state. [Background technology]

[0002] Conventionally, vehicle seats such as the one disclosed in Patent Document 1 have been known that have a function that allows the entire vehicle seat to be folded compactly into a folded state (a so-called dive-down state) by tilting the seat back forward and moving the seat cushion forward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-59765 Summary of the Invention [Problem to be solved by the invention]

[0004] The vehicle seat described in Patent Document 1 is equipped with a dive-down link and a height adjustment link for changing the height of the seat cushion, but because the pivot axes of the dive-down link and the height adjustment link are located in the same position, there is a problem that the rigidity in the vertical direction may be insufficient, resulting in reduced stability. Also, there is a need for a thinner seat by compactly arranging the frame that supports the seat cushion.

[0005] The present invention has been made in view of the above-mentioned problems, and has as its object to provide a vehicle seat having, for example, improved frame rigidity. [Means for solving the problem]

[0006] The object of the present invention is to provide a vehicle seat that includes a seat cushion and that can be reclined in a reclined state, the vehicle seat including a cushion frame that supports the seat cushion, and the cushion frame includes: The seat cushion has a first frame that supports the seat cushion and a second frame that is provided below the first frame and supports the first frame, the first frame having a first link that is rotatably connected to the second frame and that causes the seat cushion to recline forward, and the second frame having a second link that is rotatably provided and that changes the height of the seat cushion, and the problem is solved by positioning the rotation axis of the first link relative to the second frame in front of or behind the seat relative to the rotation axis of the second link relative to the second frame. The rotation axis of the first link relative to the second frame is located in front of or behind the seat relative to the rotation axis of the second link relative to the second frame, i.e., the rotation axis of the first link is offset from the rotation axis of the second link, thereby improving the rigidity of the frame, for example, in the vertical direction. In addition, for example, when the height of the seat cushion is set higher than normal (height increased state), the load applied to the second frame is distributed to two pivot axes, thereby improving the stability of the vehicle seat.

[0007] In the above configuration, the first link may be positioned more inward than an inner side portion of the second link in the seat width direction. By positioning the first link more inward than the second link, the first link and the second link do not interfere with each other when the seat is in a collapsed state, for example, and a more compact arrangement can be achieved in the seat width direction. Furthermore, by arranging the first link and the second link so as to be offset in the seat width direction, the load is distributed when the height is raised, thereby further improving rigidity.

[0008] In the above configuration, the second frame may have a bent portion that bends inward in the seat width direction and an extending portion that extends forward from the bent portion, and the first link may be attached to the extending portion. By attaching the first link to the extension of the second frame, the first link is offset from the second link, and the load is distributed when the height is raised, for example, thereby improving rigidity. In addition, the bent portion allows the first link to be positioned inside the vehicle seat, and the first link can be positioned lower without interfering with other components (for example, a slide rail device), allowing for a thinner design when the seat is reclined (folded).

[0009] In the above configuration, when the vehicle seat is in the reclined state, the extension portion of the second frame may be located in a position facing the second link in the seat width direction. By configuring the extension of the second frame to face the second link when the seat is in the reclined position, the second frame and the second link do not interfere with each other, making it possible to reduce the thickness of the seat in the vertical direction. Also, because the second frame and the second link face each other when the seat is reclined, the load can be distributed and supported in a balanced manner, improving stability.

[0010] In the above configuration, when the vehicle seat is in the reclined state, the first frame, the second frame, and the first link may be positioned at approximately the same height. By configuring the first frame, the second frame, and the first link to be positioned at approximately the same height when in the collapsed state, it is possible to reduce the thickness of the cushion frame when in the collapsed state, for example.

[0011] In the above configuration, when the vehicle seat is in the reclined state, the outer surface of the second link is preferably positioned opposite the first frame and the inner surface of the second link is preferably positioned opposite the first link in the seat width direction. When the seat is in a collapsed state, the outer surface of the second link faces the first frame, and the inner surface of the second link faces the first link, so that the first frame, first link, and second link do not interfere with each other, and the seat can be made thinner in the vertical direction. Also, because the first frame, first link, and second link are offset in the seat width direction and face each other, the load can be distributed and supported in a balanced manner, improving stability.

[0012] In the above configuration, the first link may be disposed between the second frame and the second link in the seat width direction. By disposing the first link between the second frame and the second link in the seat width direction, a compact arrangement can be achieved in the seat width direction. Also, since the rotation axis of the first link and the rotation axis of the second link are close to each other, the load acting on each rotation axis is easily distributed.

[0013] In the above configuration, the second link is rotatably connected to the floor or a bracket provided on the floor, and when the vehicle seat is in the reclined state, the rotation axis of the first link relative to the second frame is preferably located rearward of the rotation axis of the second link relative to the floor or the bracket. When the seat is in the reclined state, the rotation axis of the first link is disposed rearward of the rotation axis of the second link, allowing for a compact arrangement in the front-to-rear direction of the seat.

[0014] In the above configuration, the bent portion has an inclined portion that inclines toward the inside of the vehicle seat in the seat width direction, and the extension portion extends in the fore-and-aft direction of the seat from a front bend point in front of the inclined portion, opposite the second link. The extension portion of the second frame is configured to extend in the front-rear direction of the seat facing the second link when the seat is in the reclined state, thereby enabling a compact arrangement in the seat width direction.

[0015] In the above configuration, when the vehicle seat is in the reclined state, a rear bending point on the rear side of the inclined portion may be located forward of a rotation axis of the second link relative to the second frame. The load applied to the first link and the load applied to the second link can be dispersed from the rear bend point, improving rigidity. In addition, by configuring the rear bend point to be located forward of the pivot axis of the second link relative to the second frame when the vehicle is in a collapsed state, a more compact arrangement can be achieved.

[0016] In the above configuration, the vehicle may include a seat back that is connected to the seat cushion and that can be folded toward the seat cushion, and the first link may rotate to cause the seat cushion to fold forward in conjunction with the action of folding the seat back toward the seat cushion, and the second link may change the height of the seat cushion in conjunction with the action of folding the seat back toward the seat cushion. The first link and the second link move in conjunction with the seat back, so that the vehicle seat can be easily placed in a reclined state. [Effects of the Invention]

[0017] According to the vehicle seat of the present invention, the rotation axis of the first link relative to the second frame is located further forward or rearward of the seat than the rotation axis of the second link relative to the second frame, i.e., the rotation axis of the first link is offset from the rotation axis of the second link, thereby improving rigidity in the vertical direction. Furthermore, for example, when the height of the seat cushion is increased above normal (height-up state), the load applied to the second frame is distributed to the two rotation axes, improving the stability of the vehicle seat. Furthermore, by arranging the first link and the second link so as to be offset in the seat width direction, the load is distributed when the height is raised, thereby further improving rigidity. By attaching the first link to the extension of the second frame, the first link is offset from the second link, and the load is distributed when the seat is in a raised position, for example, thereby improving rigidity. In addition, the bent portion allows the first link to be positioned inside the vehicle seat, and the first link can be positioned lower without interfering with other components (for example, slide rails), allowing for a thinner design when the seat is reclined (folded). By configuring the extension of the second frame to face the second link when the seat is in the reclined position, the second frame and the second link do not interfere with each other, making it possible to reduce the thickness of the seat in the vertical direction. Also, because the second frame and the second link face each other when the seat is reclined, the load can be distributed and supported in a balanced manner, improving stability. By configuring the first frame, the second frame, and the first link to be positioned at approximately the same height when in the reclined state, the vehicle seat can be made thinner when in the reclined state. When the seat is in a collapsed state, the outer surface of the second link faces the first frame, and the inner surface of the second link faces the first link, so that the first frame, first link, and second link do not interfere with each other, and the seat can be made thinner in the vertical direction. Also, because the first frame, first link, and second link are offset in the seat width direction and face each other, the load can be distributed and supported in a balanced manner, improving stability. By disposing the first link between the second frame and the second link in the seat width direction, a compact arrangement can be achieved in the seat width direction. Also, since the rotation axis of the first link and the rotation axis of the second link are close to each other, the load acting on each rotation axis is easily distributed. When the seat is in the reclined state, the rotation axis of the first link is disposed rearward of the rotation axis of the second link, allowing for a compact arrangement in the front-to-rear direction of the seat. The extension portion of the second frame is configured to extend in the front-rear direction of the seat facing the second link when the seat is in the reclined state, thereby enabling a compact arrangement in the seat width direction. The extension portion that supports the load applied to the first link and the load applied to the rear of the second link can be dispersed from the rear bend point, improving rigidity. In addition, by configuring the rear bend point to be located forward of the pivot axis of the second link relative to the second frame when the vehicle is in a collapsed state, a more compact arrangement can be achieved. The first link and the second link move in conjunction with the seat back, so that the vehicle seat can be easily placed in a reclined state. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of a vehicle seat according to an embodiment of the present invention, seen obliquely from the front. [Figure 2] FIG. 2 is a perspective view showing a seat frame in a height-raised state. [Figure 3] FIG. 2 is a perspective view showing the frame in a folded state, and is a diagram mainly showing the height frame and the slide rail device. [Figure 4] FIG. 2 is a top view showing the cushion frame and the slide rail device in a folded state. [Figure 5] FIG. 2 is a top view showing the height frame and slide rail device in a folded state. [Figure 6] FIG. 4 is an explanatory diagram of a seat frame in a normal state. [Figure 7] FIG. 4 is an explanatory diagram showing the seat frame in a reclined state. [Figure 8] FIG. 10 is an explanatory diagram of the seat frame in the height-raised state. [Figure 9] FIG. 4 is an explanatory diagram showing the seat frame in a folded state. [Figure 10] 5 is a cross-sectional view of the cushion frame taken along line XX in FIG. 4. [Figure 11] 11 is an enlarged cross-sectional view of a portion of FIG. 10, showing the periphery of the left front height link. [Figure 12] 5 is an enlarged top view of a portion of FIG. 4, showing the periphery of the left front height link. FIG. [Figure 13]6 is an enlarged top view of a portion of FIG. 5, showing the periphery of the left front height link. FIG. [Figure 14] FIG. 10 is a side view showing a front side of a height frame, illustrating another example of a seat frame. DETAILED DESCRIPTION OF THE INVENTION

[0019] The configuration of a vehicle seat according to an embodiment of the present invention (the present embodiment) will be described below with reference to the drawings. However, the embodiment described below is an example for facilitating understanding of the present invention and is not intended to limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit thereof, and of course, the present invention also includes equivalents thereof.

[0020] In the following, a vehicle seat S provided in a vehicle automobile such as a minivan will be taken as an example of a vehicle seat, and an example of the configuration thereof will be described. In the following description, the "seat front-rear direction" refers to the front-rear direction of the vehicle seat S, which is the direction that coincides with the traveling direction when the vehicle is traveling. The "seat width direction" refers to the width direction of the vehicle seat S, which is the direction that coincides with the left-right direction as seen by an occupant seated in the vehicle seat S. The "up-down direction" refers to the up-down direction of the vehicle seat S, which is the direction that coincides with the vertical direction when the vehicle is traveling on a horizontal plane. The outer and inner sides are defined based on the occupant. That is, the direction toward the center of the seat width direction is the inward direction, and the direction away from it is the outward direction. A common number is assigned to a pair of left and right components, and when specifying the left and right, the name indicating the component is appended with "left side" or "right side," and the letter "L" or "R" is added to the reference symbol.

[0021] As shown in FIG. 1, the vehicle seat S is a seat placed on the floor of the vehicle and in which a vehicle occupant sits. In this embodiment, the vehicle seat S is a seat that is disposed on the right side (behind the driver's seat) of the rear seats corresponding to the rear seats of the vehicle. The vehicle seat S can also be used as a middle seat in the second row or a third seat in the third row in a vehicle that has three rows of seats in the longitudinal direction of the vehicle. The vehicle seat S may also be used as a front seat corresponding to the front seats.

[0022] The vehicle seat S of this embodiment is configured to be able to transition between a plurality of states. Hereinafter, a state in which an occupant can sit in the vehicle seat S in an edge-sitting position (sitting with legs down) will be referred to as the "normal state" of the vehicle seat S (see FIGS. 1 and 6). A state in which the seat back 2 is rotated rearward of the seat cushion 1 from the normal state will be referred to as the "reclining state" of the vehicle seat S (see FIG. 7). On the other hand, a state in which the position of the seat cushion 1 is higher than the position in the normal state (see FIGS. 2 and 8) will be referred to as the "height-raised state." A state in which the seat cushion 1 is moved to collapse (sink) onto the vehicle floor and the entire vehicle seat S is folded (see FIG. 9) will be referred to as the "folded state." The folded state may also be referred to as the "dive-down state." A state in which the seat cushion 1 is simply moved to collapse onto the vehicle floor, regardless of the state of the seat back 2, may also be referred to as the "collapsed state." In addition, the state in which the height of the seat cushion 1 is lowested by the height link HL may be referred to as the "height-down state."

[0023] The vehicle seat S can be arranged in a normal state in which an occupant can be seated, a reclined state in which the seat back 2 is rotated backward, a height-raised state in which the position of the seat cushion 1 is raised, and a folded state in which the seat back 2 is folded and tilted forward.

[0024] The occupant can move the entire seat forward or backward by operating a slide rail operating lever 41 located on the front left side of the seat cushion 1. In addition, by operating a height frame operating lever 42 located on the front right side of the seat cushion, the occupant can rotate a height link HL, which will be described later, to change the height of the seat cushion 1. In addition, by operating a lever located on the shoulder of the seat back 2, the seat back 2 can be rotated forward or backward and folded down. Furthermore, the shape, position, posture, etc. of each part of the vehicle seat S described below will be described assuming that the vehicle seat S is in a normal state, unless otherwise specified.

[0025] <Vehicle seat S> The overall configuration of a vehicle seat S according to this embodiment will be outlined with reference to FIGS. 1 to 10. FIG. 1 is a perspective view of the vehicle seat S according to this embodiment, seen obliquely from the front, and FIG. 2 is a perspective view showing the seat frame F of the vehicle seat S in a height-raised state. FIG. 3 is a perspective view showing the seat frame F in a folded state, mainly showing the height frame 20 and the slide rail device 6. FIG. 4 is a top view showing the cushion frame Cf and the slide rail device 6 in a folded state. FIG. 5 is a top view showing the seat frame F in a folded state, mainly showing the height frame 20 and the slide rail device 6. FIG. 6 is an explanatory diagram showing the seat frame F in a normal state, and FIG. 7 is an explanatory diagram showing the seat frame F in a reclined state. FIG. 8 is an explanatory diagram showing the seat frame F in a height-raised state, and FIG. 9 is a side view showing the seat frame F in a folded state. FIG. 10 is a cross-sectional view of the cushion frame Cf taken along line XX in FIG. 4. In FIG. 1, for convenience of illustration, a part of the vehicle seat S is shown with the cover material Tr removed and the pad material P exposed.

[0026] As shown in Fig. 1, the vehicle seat S according to this embodiment mainly comprises a seat cushion 1, a seat back 2, a headrest 3, a reclining device 5, and a slide rail device 6. In the following description, the seat cushion 1, the seat back 2, and the headrest 3 may be collectively referred to as a seat body Sh. A buckle for a seat belt 9 is provided on the left rear portion of the seat cushion 1. 2, a seat frame F that forms the framework of the vehicle seat S is provided inside the vehicle seat S. The seat frame F includes a cushion frame Cf, a back frame 30, and a headrest frame 36.

[0027] <Seat cushion 1> The seat cushion 1 is a support member that supports the buttocks of a seated occupant (hereinafter, sometimes referred to as a seated person), and supports the seated person from below. As shown in FIG. 2, the seat cushion 1 includes a cushion frame Cf that forms the skeleton of the seat cushion 1. The cushion frame Cf of this embodiment is composed of a cushion main body frame 10 that directly supports the seated person, and a height frame 20 that is disposed below the cushion main body frame 10 and supports the cushion main body frame 10. The cushion main body frame 10 corresponds to the first frame of the present invention, and the height frame 20 corresponds to the second frame.

[0028] <Cushion body frame 10> The cushion main body frame 10 is a frame body having a rectangular shape when viewed from above. The cushion main body frame 10 has cushion side frames 11 that constitute the frame body, a pan frame 14 that connects the cushion side frames 11, and a cushion frame member 15. The cushion main body frame 10 also has a dive down link 16 that connects to the height frame 20 at its front end.

[0029] The cushion side frame 11 is composed of a right cushion side frame 11R disposed on the right side of the cushion main body frame 10 and a left cushion side frame 11L disposed on the left side. The right cushion side frame 11R and the left cushion side frame 11L extend in the front-to-rear direction. As shown in FIG. 4, the right cushion side frame 11R and the left cushion side frame 11L extend in different directions, with the right cushion side frame 11R bending outward (to the right) at the front and then extending in the front-to-rear direction. This makes it possible to ensure a seating space for the occupant while preventing the right cushion side frame 11R from interfering with other interior components arranged in the vehicle.

[0030] Each of the cushion side frames 11 has a folding mechanism. Specifically, the right cushion side frame 11R and the left cushion side frame 11L have a rear cushion side frame 12 and a front cushion side frame 13 that are rotatably connected around a folding pivot shaft 12a (see FIGS. 2 and 4).

[0031] The rear cushion side frame 12 arranged on the right side of the vehicle seat S may be referred to as the right rear cushion side frame 12R, and the rear cushion side frame 12 arranged on the left side may be referred to as the left rear cushion side frame 12L. The front cushion side frame 13 arranged on the right side of the vehicle seat S may be referred to as the right front cushion side frame 13R, and the front cushion side frame 13 arranged on the left side may be referred to as the left front cushion side frame 13L.

[0032] The pan frame 14 is made of a plate-like member and connects the front ends of the cushion side frames 11. The cushion frame members 15 are made of a pipe material and connect the central portions in the front-to-rear direction of the cushion side frames 11. A portion of the cushion frame member 15 is bent rearward, and the central portion of the cushion frame member 15 in the seat width direction is curved so that it is positioned rearward.

[0033] 2 and 4, a plurality of S-springs 18 are attached to the cushion main body frame 10 as pressure-receiving members that receive the load of the seated occupant, spanning the pan frame 14 and the cushion frame member 15. As described above, the central portion of the cushion frame member 15 has a shape that curves backward, so that the S-springs 18 can receive the load of the seated occupant over a wide area in the front-to-rear direction. In this embodiment, the pressure-receiving member is made up of a plurality of S-springs 18, but is not limited to this. The pressure-receiving member provided on the cushion main body frame 10 may be made up of an elastic plate-shaped member.

[0034] A slide rail operating lever 41 for operating the slide rail device 6 is provided in front of the left front cushion side frame 13L. In addition, a height frame operating lever 42 for operating the height frame 20 (described later) is provided in front of the right front cushion side frame 13R.

[0035] An ottoman for supporting the legs of a seated person may be provided on the seat cushion 1. When an ottoman is provided, an ottoman support mechanism (not shown) for supporting the ottoman may be provided between the slide rail operation lever 41 and the height frame operation lever 42.

[0036] <Dive Downlink 16> The dive down link 16 is interposed between the cushion side frame 11 and the front end of the height frame 20, and supports the cushion main body frame 10 in cooperation with the seat back 2, which will be described later. The dive downlink 16 mainly comprises a right dive downlink 16R located on the right side, a left dive downlink 16L located on the left side, and a dive downlink member 17 (see Figures 3 and 5).

[0037] The right dive down link 16R and the left dive down link 16L are long plate members each having a first rotation shaft 16a at one longitudinal end and a second rotation shaft 16b at the other end. The first rotation shaft 16a is rotatably connected to the cushion side frame 11, and the second rotation shaft 16b is rotatably connected to the height side frame 21. By rotating the right dive down link 16R and the left dive down link 16L, the vehicle seat S transitions between a normal state (see FIG. 6) in which the cushion main body frame 10 is spaced above the height frame 20, and a reclined state (or folded state, see FIG. 9) in which the cushion main body frame 10 is sunk downward.

[0038] <Elastic member 80> An elastic member 80 is provided at the longitudinal center of the right dive down link 16R and the left dive down link 16L. The elastic member 80 has a substantially rectangular parallelepiped shape and abuts against the slide rail device 6 in the folded state shown in FIG. 9. This makes it possible to suppress movement of the left and right dive down links 16 in the folded state. This makes it possible to suppress rattling of the vehicle seat S when it is stored below the floor.

[0039] As shown in Fig. 3, the elastic member 80 is fixed to an elastic member fixing portion 16c provided on the outer side of the dive down link 16 in the seat width direction. The elastic member fixing portion 16c is formed by bending the dive down link 16 made of a plate member. This eliminates the need to separately prepare a member such as a bracket for fixing the elastic member 80, thereby reducing the number of parts of the vehicle seat S. However, without being limited to this, a fixing member for fixing the elastic member 80 may be provided as a separate member.

[0040] The dive down link member 17 connects the right dive down link 16R and the left dive down link 16L, increasing the rigidity of the dive down link 16. In addition, by connecting the right dive down link 16R and the left dive down link 16L with the dive down link member 17, the cushion main body frame 10 can be smoothly raised and lowered relative to the height frame 20.

[0041] <Height frame 20> The cushion frame Cf includes the height frame 20 below the cushion main body frame 10 to support the cushion main body frame 10 as described above. The height frame 20 is a frame body having a rectangular shape when viewed from above, and includes height side frames 21 that constitute the frame body, a front height frame member 24, an intermediate height frame member 25, a rear height frame member 26, and a connecting shaft 27. The height frame 20 also has a front height link 22 and a rear height link 23 that are interposed between the height side frames 21 and the slide rail device 6.

[0042] The height side frame 21 is composed of a right height side frame 21R arranged on the right side of the height frame 20 and a left height side frame 21L arranged on the left side. The right height side frame 21R and the left height side frame 21L have an elongated shape and extend in the front-to-rear direction. The right height side frame 21R and the left height side frame 21L are plate-like bodies that, when viewed from the side, have a generally triangular shape that increases in height toward the rear.

[0043] 4 and 5, the left height side frame 21L has a portion that is bent toward the inside or outside of the seat in the seat width direction. This allows the left height side frame 21L to be positioned above the slide rail device 6 while avoiding interference with the slide lock device 63 and the front connecting bracket 43 disposed on the slide rail device 6.

[0044] An extended height side frame 21E is provided on the right side of the right height side frame 21R. The extended height side frame 21E is connected to the right height side frame 21R via a rear height frame member 26 and two connecting pipes 21Ea. However, the number and arrangement of the connecting pipes 21Ea are not limited to those shown in Figures 4 and 5. Three or more connecting pipes 21Ea may connect the right height side frame 21R and the extended height side frame 21E.

[0045] The front end of the right height side frame 21R and the front end of the left height side frame 21L are connected by a front height frame member 24. In addition, the rear end of the right height side frame 21R and the rear end of the left height side frame 21L are connected by a rear height frame member 26. The front height frame member 24 and the rear height frame member 26 are made of round pipe material that extends linearly.

[0046] An intermediate height frame member 25 is provided between the front height frame member 24 and the rear height frame member 26, and the intermediate height frame member 25 connects the right height side frame 21R and the left height side frame 21L. The intermediate-height frame member 25 is made of a straight round pipe material, but is not limited to this. For example, the intermediate-height frame member 25 may have a curved shape to avoid interference with other members. As a specific example, the intermediate-height frame member 25 may have a shape in which the center portion in the seat width direction is curved rearward.

[0047] The front height link 22 and the rear height link 23 are made of long plate-like members. The front height link 22 is rotatably connected to the height side frame 21 via a first pivot shaft 22a. A front connecting bracket 43 is provided on the upper surface of the slide rail device 6, and the front height link 22 is rotatably connected to the slide rail device 6 via a second pivot shaft 22b provided on the front connecting bracket 43. The left and right first pivot shafts 22a are connected by a front connecting shaft 27a (see FIG. 5). The front height link 22 is a driven link mechanism that operates in response to the rear height link 23 when the height frame operating lever 42 is operated.

[0048] 3 and 5, the left and right front height links 22 are connected by a front height link member 28. The front height link member 28 is made of a long plate-like member. The front height link member 28 is attached so as to be located in front of the front connecting shaft 27a when the vehicle seat S is in the folded state.

[0049] As shown in Fig. 8, the rear height link 23 is rotatably connected to the height side frame 21 via a first pivot shaft 23a. The rear height link 23 is rotatably connected to the slide rail device 6 via a second pivot shaft 23b provided on the rear connecting bracket 44. The left and right first pivot shafts 23a are connected by a rear connecting shaft 27b, as shown in Fig. 4. The rear connecting shaft 27b is provided with a lifting / lowering unit 7 that rotates the rear height link 23 and raises and lowers the seat surface of the seat cushion 1. The rear height link 23 is a driven link mechanism that is driven when the height frame operating lever 42 is operated. As shown in FIGS. 3 and 5, the rear height links 23 provided on the left and right sides are connected by a rear height link member 29 formed in a pipe shape.

[0050] In the following, when there is no need to distinguish between the front height link 22 and the rear height link 23, they may be collectively referred to simply as height link HL. The front height link 22 arranged on the right side of the vehicle seat S may be referred to as the right front height link 22R, and the front height link 22 arranged on the left side may be referred to as the left front height link 22L. The rear height link 23 arranged on the right side of the vehicle seat S may be referred to as the right rear height link 23R, and the rear height link 23 arranged on the left side may be referred to as the left rear height link 23L.

[0051] The front height links 22 and the rear height links 23 rotate so as to stand upright forward relative to the slide rail device 6, thereby raising the cushion main body frame 10. This causes the vehicle seat S to transition from the normal state shown in Fig. 6 to the height-raised state shown in Fig. 8. Conversely, the front height links 22 and the rear height links 23 rotate so as to lean backward relative to the slide rail device 6, thereby lowering the cushion main body frame 10. This causes the vehicle seat S to transition from the height-raised state shown in Fig. 8 to the normal state shown in Fig. 6.

[0052] The second rotation shaft 16b of the dive down link 16 is rotatably provided at the front end of each height side frame 21. In addition, the rear end of each height side frame 21 is connected to the side connecting frame 32 of the back frame 30 via the reclining device 5. This allows each height side frame 21 to support the cushion main body frame 10 from below via the dive down link 16 at the front end and the back side frame 31 at the rear end.

[0053] <Pad material P> A pad material P for the seat cushion is placed on the cushion main body frame 10, and the pad material P is covered with a skin material Tr. The pad material P is a cushion material and is made of, for example, a urethane resin (foam resin) such as soft polyurethane foam. The pad material P may be made of biomass urethane. The skin material Tr that covers the pad material P is made of, for example, a stretchable synthetic leather material. The skin material Tr may be made of cloth, film, leather, etc.

[0054] <Seatback 2> The seat back 2 is a support member that supports the back of a seated occupant, and supports the seated occupant from behind. As shown in Fig. 2, the seat back 2 has a back frame 30 that forms the skeleton of the seat back 2. The seat back 2 has a back frame pad material P that covers the back frame 30, and a cover material Tr that covers the pad material P.

[0055] The back frame 30 is a frame body having a substantially rectangular shape when viewed from the front. The back frame 30 mainly comprises a pair of back side frames 31, a side connecting frame 32, a back upper frame 33, a back lower frame 34, and a pressure plate 35. The pair of back side frames 31 are elongated frame members extending in the vertical direction and are disposed apart from each other while facing each other in the seat width direction. The side connecting frame 32 is connected to the lower end of the back side frame 31 and the reclining device 5. In addition, the side connecting frame 32 is connected to the upper end (rear end) of the rear cushion side frame 12.

[0056] The back upper frame 33 connects the upper ends of the left and right back side frames 31, and the back lower frame 34 connects the lower ends of the left and right back side frames 31. The pressure plate 35 is a plate-shaped member that is attached to the inside of the back frame 30 and receives the weight of a seated person.

[0057] The seat back 2 is connected to the seat cushion 1 and is configured to be foldable toward the seat cushion 1 as shown in FIG. When the seat back 2 is folded, the dive down link 16 of the seat cushion 1 rotates in conjunction with the operation of folding the seat back 2 toward the seat cushion 1, causing the seat cushion 1 to fall forward. At this time, the height links HL (front height link 22 and rear height link 23) of the seat cushion 1 also rotate toward the rear of the seat in conjunction with the operation of folding the seat back 2 toward the seat cushion 1, thereby lowering the height of the seat cushion 1. The dive down link 16 and the height link HL move in conjunction with the seat back 2, so that the vehicle seat S can be easily folded (folded down).

[0058] <Headrest 3> The headrest 3 is a support member that supports the head of a seated occupant from behind. As shown in Fig. 2, the headrest 3 has a headrest frame 36 that forms the skeleton of the headrest 3. The headrest 3 has a headrest padding material (not shown) that covers the headrest frame 36, and a skin material Tr that covers the padding material.

[0059] <Reclining device 5> The reclining device 5 rotatably connects the seat back 2 to the seat cushion 1. More specifically, as shown in FIGS. 6 to 9, the reclining device 5 connects the rear end of the height frame 20 and the lower end of the back frame 30 that constitute the seat cushion 1. The reclining device 5 rotates the seat back 2 rearward relative to the seat cushion 1, thereby transitioning the vehicle seat S to a reclined state. The reclining device 5 also rotates the seat back 2 forward relative to the seat cushion 1, thereby transitioning the vehicle seat S to a folded state.

[0060] <Slide rail device 6> As shown in Figures 1 and 2, the slide rail device 6 connects the vehicle seat S to the vehicle floor so that the seat can slide in the front-rear direction. The movement direction of the slide rail device 6 is not limited to the front-rear direction of the seat, but may also be the seat width direction (left-right direction). In other words, the slide rail device 6 may connect the vehicle seat S to the vehicle floor so that the vehicle seat S can slide in the seat width direction. In other words, the slide rail device 6 is a device that moves the seat cushion 1 of the vehicle seat S in a predetermined direction.

[0061] As shown in FIG. 1, the slide rail device 6 is provided below the vehicle seat S. The slide rail device 6 has a known structure (the structure of a general slide rail mechanism). In detail, the slide rail device 6 has a lower rail 61 fixed to the floor and an upper rail 62 that is slidable in the front-to-rear direction relative to the lower rail 61. The slide rail device 6 also has a slide lock device 63 that restricts the sliding movement of the upper rail 62 relative to the lower rail 61. The slide lock device 63 can release the restriction on the sliding movement by operating a slide rail operating lever 41 provided on the seat cushion 1.

[0062] The slide lock device 63 also has a lock operation lever 63a that protrudes from the top surface of the upper rail 62 and is used to release the lock. The lock operation lever 63a is connected to a cable 64 that extends from the slide rail operation lever 41, and can be released by being pulled. When the pulling by the cable 64 is released, the lock operation lever 63a is returned to its original position by the spring member 63b and is locked again.

[0063] As described above, the upper rail 62 is provided with the front connecting bracket 43 and the rear connecting bracket 44. The upper rail 62 is connected to the height link HL of the cushion frame Cf via the front connecting bracket 43 and the rear connecting bracket 44. When the vehicle seat S is in a normal state, the height of the seat cushion 1 can be changed by rotating the height link HL in an upright direction, and the vehicle seat S can be brought into a height-raised state. The vehicle seat S is equipped with a slide rail device 6 and a height link HL rotatably connected to the slide rail device 6, which allows the seat cushion 1 to be moved in a predetermined direction (in the fore-and-aft direction of the seat in this embodiment) while changing the height of the seat cushion 1, thereby improving the freedom of seat arrangement.

[0064] <Lifting movable part 7> As shown in FIGS. 3 and 4, in the vehicle seat S of this embodiment, the rear connecting shaft 27b is provided with a lifting and lowering movable portion 7 that assists the lifting and lowering operation.

[0065] The lifting movable portion 7 is arranged along the circumferential direction of the rear connecting shaft 27b and is composed of a biasing spring 70 that assists the rotational movement of the pair of rear height links 23, and a lifting regulation portion 71 that regulates the lifting and lowering of the seat cushion 1. Although the biasing spring 70 is provided at both ends of the rear connecting shaft 27b, this is just one example, and the biasing spring 70 may be provided at either end of the rear connecting shaft 27b. The biasing spring 70 is formed as a spiral spring. An inner end locking portion that locks the inner end of the biasing spring 70 is formed on the rear connecting shaft 27b. Further, the height side frame 21 is provided with a stopper portion 75 that engages the outer end of the biasing spring 70 .

[0066] <Reverse rotation suppression device 50> The vehicle seat S of this embodiment is provided with a reverse rotation suppression device 50, as shown in Fig. 2. The reverse rotation suppression device 50 is a device that suppresses the front height link 22 from rotating in the reverse direction when the seat cushion 1 is raised from a state in which the seat cushion height is at its lowest. As shown in Fig. 3, for example, the reverse rotation suppression device 50 is provided below the front height link 22 when the vehicle seat S is in a folded state and the seat cushion 1 is at its lowest height (height-down state). By providing the reverse rotation suppression device 50, reverse rotation of the front height link 22 during ascent can be suppressed.

[0067] <Positional relationship of the rotation axis> Here, with reference to FIG. 8, the positional relationship between the second rotation shaft 16b of the dive down link 16 relative to the height frame 20 and the first rotation shaft 22a of the height link HL relative to the height frame 20 will be described. 8, one end of the dive down link 16 is rotatably connected to the cushion main body frame 10 via the first rotation shaft 16a, and the other end is rotatably connected to the height frame 20 (more specifically, the height side frame 21) via the second rotation shaft 16b. Also, one end of the front height link 22 is rotatably connected to the height frame 20 (more specifically, the height side frame 21) via the first rotation shaft 22a, and the other end is rotatably connected to the slide rail device 6 via the second rotation shaft 22b. The cushion body frame 10 corresponds to the first frame of the present invention, and the height frame 20 corresponds to the second frame. The dive down link 16 corresponds to the first link of the present invention, and the front height link 22 corresponds to the second link.

[0068] As shown in Figure 8, the second pivot shaft 16b of the dive down link 16 is located further forward of the seat than the first pivot shaft 22a of the front height link 22. In other words, the second pivot shaft 16b of the dive down link 16 is offset forward of the first pivot shaft 22a of the front height link 22. By offsetting the pivot shafts of each link relative to the height frame 20 in this manner, the frame's rigidity in the vertical direction can be improved compared to when the pivot shafts are aligned. In particular, when the vehicle seat S is in the raised height state, the load applied to the height frame 20 is distributed between the second pivot shaft 16b and the first pivot shaft 22a, improving the stability of the vehicle seat S.

[0069] In the vehicle seat S of this embodiment, the second pivot shaft 16b is offset forward from the first pivot shaft 22a, but the position of the second pivot shaft 16b is not limited thereto. Fig. 14 shows a cushion frame CfA of a vehicle seat SA, which is another example of the vehicle seat S. As in the cushion frame CfA of this example, the second pivot shaft 16bA of the dive down link 16A relative to the height frame 20 (more specifically, the height side frame 21) may be located rearward (behind the seat) from the first pivot shaft 22aA of the front height link 22A relative to the height frame 20. In other words, the second pivot shaft 16bA of the dive down link 16A may be offset rearward from the first pivot shaft 22aA of the front height link 22A.

[0070] Next, the positional relationship between the dive down link 16 and the front height link 22 in the seat width direction will be described with reference to Figures 11 to 13. As shown in Figure 11, the dive down link 16 is located more inward in the seat width direction than the inner side portion 22d of the front height link 22. More specifically, the left dive down link 16L is located more inward in the seat width direction than the inner side portion 22d of the left front height link 22L. In other words, the dive down link 16 is positioned offset inward in the seat width direction from the front height link 22. Therefore, for example, when the vehicle seat S is deformed into a folded state (a reclined state), it is possible to prevent interference between the dive down link 16 and the front height link 22. Also, a more compact arrangement can be achieved in the seat width direction.

[0071] 13, the height side frame 21 (the left height side frame 21L in the drawing) of the height frame 20 has a bent portion 21a that bends inward in the seat width direction and an extending portion 21b that extends forward from the bent portion 21a. The bent portion 21a is composed of a rear bent point 21a1 that bends the height side frame 21 inward, a front bent point 21a2 that bends the height side frame 21 so that it extends forward, and an inclined portion 21a3 that extends obliquely from the rear bent point 21a1 toward the inside of the seat between the rear bent point 21a1 and the front bent point 21a2. The extending portion 21b extends forward from the front bent point 21a2. The dive down link 16 (more specifically, the left dive down link 16L) is attached via a second pivot shaft 16b to the extension portion 21b of the height side frame 21. As shown in Fig. 4, the right dive down link 16R is also attached via a second pivot shaft 16b to the extension portion 21b of the right height side frame 21R.

[0072] By attaching the dive down link 16 to the extension portion 21b of the height frame 20 (height side frame 21), the dive down link 16 is offset inward from the front height link 22, which distributes the load when the height is raised, for example, thereby improving rigidity. In addition, the bent portion 21a allows the dive down link 16 to be positioned further inward in the seat, and the dive down link 16 can be positioned lower without interfering with other components, such as the slide rail device 6, allowing the cushion frame Cf to be thinner in the folded state.

[0073] When the vehicle seat S is in the folded state, the extension portion 21b of the height side frame 21 is configured to be located opposite the front height link 22 in the seat width direction. Since the extensions 21b and the front height links 22 are positioned opposite each other, the height side frames 21 and the front height links 22 do not interfere with each other when the seat is folded, allowing for a thinner seat in the up-down direction. Furthermore, the load applied from the dive down links 16 can be distributed and supported in a balanced manner, improving stability.

[0074] As described above, the extension portion 21b extends forward from the front bending point 21a2, and when the vehicle seat S is in the folded state, the extension portion 21b is configured to face the front height link 22 (more specifically, the inner side portion 22d of the front height link) as shown in Fig. 13. This configuration allows the height side frame 21 and the front height link 22 to be arranged more compactly in the seat width direction.

[0075] When the vehicle seat S is in the folded state, the rear bending point 21a1 of the height side frame 21 is located forward of the first rotation shaft 22a of the front height link 22 relative to the height side frame 21, as shown in FIG. By positioning the rear bending point 21a1 forward of the first pivot shaft 22a, the load applied to the dive down link 16 and the load applied to the front height link 22 in the extension portion 21b can be dispersed starting from the rear bending point 21a1, improving rigidity. This also allows the dive down link 16 and the front height link 22 to be arranged more compactly.

[0076] 11, when the vehicle seat S is in the folded state, the dive down link 16, the height frame 20, and the cushion main body frame 10 (more specifically, the cushion side frame 11) are positioned at approximately the same height. By configuring the dive down link 16, the height frame 20, and the cushion main body frame 10 to be positioned at the same height when in the folded state, it is possible to reduce the thickness of the cushion frame Cf when in the folded state (folded state), for example.

[0077] Furthermore, when the vehicle seat S is in a folded state, the outer surface (outer side portion 22e) of the front height link 22 is disposed in a position facing the cushion side frame 11 of the cushion main body frame 10 in the seat width direction. Furthermore, the inner surface (inner side portion 22d) of the front height link 22 is disposed in a position facing the dive down link 16. With this configuration, the cushion main body frame 10, front height link 22, and dive down link 16 do not interfere with each other, and the cushion frame Cf can be made thinner in the vertical direction.

[0078] As shown in FIG. 12, the dive down link 16 is preferably disposed between the height frame 20 (more specifically, the height side frame 21) and the front height link 22 in the seat width direction. By disposing the dive down link 16 between the height frame 20 and the front height link 22 in the seat width direction, a compact arrangement can be achieved in the seat width direction. Furthermore, by disposing the dive down link 16 in this manner, the second rotation shaft 16b of the dive down link 16 and the second rotation shaft 22b of the front height link 22 are close to each other, which makes it easier to distribute the load acting on each rotation shaft.

[0079] As described above, the front height link 22 is rotatably connected to the front connecting bracket 43 provided on the slide rail device 6 via the second rotation shaft 22b. If the slide rail device 6 is not provided on the vehicle seat S, the front height link 22 may be rotatably connected to the vehicle floor. 12, when the vehicle seat S is in the folded state, the second rotation shaft 16b of the dive down link 16 relative to the height side frame 21 is configured to be located rearward of the second rotation shaft 22b of the front height link 22. This allows the dive down link 16 and the front height link 22 to be arranged more compactly in the front-to-rear direction of the seat.

[0080] <Method for manufacturing vehicle seat S> A vehicle seat S (vehicle seat) is provided with a seat cushion 1, and the vehicle seat S can be manufactured by a manufacturing method that includes preparing a cushion main body frame 10 (first frame) that supports the seat cushion 1, a height frame 20 (second frame) that is provided below the cushion main body frame 10 and supports the cushion main body frame, a dive down link 16 (first link) that is provided on the cushion main body frame and rotatably connected to the height frame 20 and that causes the seat cushion 1 to fold forward, and height links HL (front height link 22, rear height link 23, second link) that are provided on the height frame 20 and rotatable relative to the height frame 20 and that change the height of the seat cushion 1, and attaching a rotation axis (second rotation axis 16b) of the dive down link 16 relative to the height frame 20 so that it is positioned forward or rearward of the seat relative to the rotation axis (first rotation axis 22a) of the height link HL relative to the height frame 20.

[0081] As an embodiment of the present invention, a vehicle seat S to be mounted in a vehicle has been described above, and an example of its configuration has been explained using the drawings. However, the present invention is not limited to seats mounted in ground-traveling vehicles with wheels such as automobiles and trains, and may also be applied to seats mounted in aircraft, ships, and other vehicles that move on non-ground surfaces, for example. [Explanation of symbols]

[0082] S Vehicle seat (vehicle seat) Front seat frame P pad material Tr skin material Sh seat body 1 seat cushion 2 seat backs 3 Headrest 5 Reclining device 6 Slide rail device 61 Lower rail 62 Upper Rail 63 Slide lock device 63a Lock operation lever (protruding part) 63b Spring member 64 Cable 7. Lifting and lowering part 70 bias spring 71 Lifting control section 75 Stopper part 9. Seatbelts Cf Cushion Frame 10 Cushion main frame (first frame) 11 Cushion side frame 11R Right side cushion side frame 11L Left side cushion side frame 12 Rear cushion side frame (first side frame) 12R Right rear cushion side frame 12L Left rear cushion side frame 13 Front cushion side frame (second side frame) 13R Right front cushion side frame 13L Left front cushion side frame 14 Pan Frame 15 Cushion frame member 16 Dive Downlink (First Link) 16a First rotation axis 16b Second rotation axis 16c Elastic member fixing part 16R Right Dive Downlink 16L left dive downlink 17 Dive Downlink Members 18 S spring (pressure-receiving member) 20 Height frame (second frame) 21 Height side frame 21R Right side height side frame 21L Left side height side frame 21E Extended Height Side Frame 21Ea Connecting pipe 21a Bend part 21a1 Posterior bending point 21a2 Anterior bending point 21a3 Slope 21b Extension HL Height Link (Second Link) 22 Front height link (second link) 22a First rotation axis 22b Second rotation axis 22d Inner side 22e outer side 22R Right front height link 22L left front height link 23 Rear height link (second link) 23a First rotation axis 23b Second rotation axis 23R Right rear height link 23L Left rear height link 24 Front height frame member 25 Mid-height frame member 26 Rear height frame member 27 Connecting shaft 27a Front connecting shaft 27b Rear connecting shaft 28 Front height link member 29 Rear height link member 30 Back Frame 31 Backside Frame 32 Side connecting frame 33 Back upper frame 34 Back lower frame 35 Pressure Plate 36 Headrest frame 41 Slide rail operating lever 42 Height frame operating lever 43 Front connecting bracket 44 Rear connecting bracket 50 Reverse rotation suppression device 80 Elastic member (rattle suppression member)

Claims

1. A vehicle seat including a seat cushion, the seat cushion being capable of being reclined, a cushion frame supporting the seat cushion; The cushion frame is a first frame supporting the seat cushion; a second frame provided below the first frame and supporting the first frame, the first frame has a first link that is rotatably connected to the second frame and causes the seat cushion to fold forward, the second frame has a second link that is rotatably provided and changes the height of the seat cushion, A vehicle seat, characterized in that a rotation axis of the first link relative to the second frame is located in front of or behind the seat relative to a rotation axis of the second link relative to the second frame.

2. 2. The vehicle seat according to claim 1, wherein the first link is located more inwardly than an inner side portion of the second link in the seat width direction.

3. the second frame has a bent portion that bends inward in the seat width direction and an extending portion that extends forward from the bent portion, The vehicle seat according to claim 1 , wherein the first link is attached to the extension.

4. The vehicle seat according to claim 3, wherein when the vehicle seat is in the reclined state, the extension portion of the second frame is located in a position facing the second link in the seat width direction.

5. 2. The vehicle seat according to claim 1, wherein when the vehicle seat is in the reclined state, the first frame, the second frame, and the first link are positioned at approximately the same height.

6. 2. The vehicle seat according to claim 1, wherein, when the vehicle seat is in the reclined state, the outer surface of the second link faces the first frame and the inner surface of the second link faces the first link in the seat width direction.

7. The vehicle seat according to claim 1, wherein the first link is disposed between the second frame and the second link in the seat width direction.

8. The second link is rotatably connected to a floor or a bracket provided on the floor, 2. The vehicle seat according to claim 1, wherein, when the vehicle seat is in the reclined state, the pivot axis of the first link relative to the second frame is located rearward of the pivot axis of the second link relative to the floor or the bracket.

9. The vehicle seat according to claim 3, characterized in that the bent portion has an inclined portion that is inclined toward the inside of the vehicle seat in the seat width direction, and the extension portion extends in the fore-and-aft direction of the seat from a front bend point in front of the inclined portion, opposite the second link.

10. The vehicle seat according to claim 9, characterized in that, when the vehicle seat is in the reclined state, a rear bending point on the rear side of the inclined portion is located forward of the pivot axis of the second link relative to the second frame.

11. a seat back connected to the seat cushion and foldable toward the seat cushion; the first link rotates in conjunction with an operation of folding the seat back toward the seat cushion to cause the seat cushion to fold forward, 2. The vehicle seat according to claim 1, wherein the second link changes the height of the seat cushion in conjunction with an operation of folding the seat back toward the seat cushion.

Images