Vehicular seat

Abstract

To provide a vehicular seat that is configured so that a link is prevented from rotating backward when the seat is lifted up.SOLUTION: A vehicular seat comprises: a seat cushion; a cushion frame Cf that supports the seat cushion and lifts up and down the seat cushion; height links HL turnably connected to a side part of the cushion frame CF in a width direction of the seat, and changing a height of the seat cushion by turning operation; and a backward rotation suppressing device 50 provided below the height links in a height-down state where a height of the seat cushion is lowered most, and preventing the height links HL from rotating in a backward direction when lifting up the seat cushion from the height-down state.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.

[0003] Furthermore, Patent Document 2 discloses a height adjustment device for an automobile seat that includes a link for changing the seating surface of a seat cushion, and a pinion gear and a spiral spring connected to the link. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-59765 [Patent Document 2] Patent No. 4899205 Summary of the Invention [Problem to be solved by the invention]

[0005] The vehicle seat described in Patent Document 1 is provided with a link for dive-down and a height adjustment link for changing the height of the seat cushion, but has no lifting means to assist in changing the height of the seat cushion, which poses the problem that a large amount of force is required to change the height. Furthermore, Patent Document 2 discloses a height adjustment device that adjusts height using a spiral spring or the like, but when the link is rotated to raise it, there is a possibility that it may rotate in the opposite direction to the rotation direction of the link, and there was a need for a means to prevent this from happening.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a vehicle seat in which reverse rotation of a link is suppressed when ascending. [Means for solving the problem]

[0007] The above problem is solved by the vehicle seat of the present invention, which comprises a seat cushion, a cushion frame that supports and raises and lowers the seat cushion, a height link that is rotatably connected to the side of the cushion frame in the seat width direction and changes the height of the seat cushion by rotating, and a reverse rotation suppression device that is provided below the height link when the seat cushion is in the height-down state where the height of the seat cushion is lowest, and that suppresses the height link from rotating in the reverse direction when the seat cushion is raised from the height-down state. By providing a reverse rotation suppression device, it is possible to provide a vehicle seat in which reverse rotation of the height link (link) during ascent is suppressed.

[0008] In the above configuration, the reverse rotation suppression device may include a biasing portion that biases the height link in an upward direction. By biasing the height link in an upward direction with the biasing portion, reverse rotation can be suppressed.

[0009] In the above configuration, the reverse rotation suppression device may include a support portion that transmits the biasing force of the biasing portion to the height link. By providing the support portion, the biasing force of the biasing portion can be efficiently transmitted to the height link.

[0010] In the above configuration, a slide rail device may be provided that slides the seat cushion in the fore-and-aft direction of the seat, the slide rail device being composed of a lower rail fixed to the floor and an upper rail that slides on the lower rail, and the support portion may be arranged on the upper rail. By arranging the support portion of the reverse rotation suppression device on the upper rail, the support portion can slide together with the height link, and reverse rotation of the height link can be suppressed regardless of the sliding position of the upper rail, for example.

[0011] In the above configuration, one end of the support portion is connected to the biasing portion, and the other end of the support portion is connected to the upper rail via a rotation axis, and the support portion rotates upward due to the biasing force of the biasing portion. Since the support portion can move in accordance with the rotational movement of the height link, reverse rotation of the height link can be further suppressed.

[0012] In the above configuration, the support portion may have a cover portion at the one end of the support portion that covers a head portion of the urging portion, and the cover portion may face a rear end of the height link in the seat front-rear direction. By having the cover part facing the rear end of the height link, for example, the support part can reliably transmit the biasing force to the height link without slipping relative to the height link. Also, by covering the head of the biasing part with the cover part, the biasing part can be protected.

[0013] In the above configuration, the support portion and the biasing portion may be disposed between both side portions of the slide rail device in the seat width direction when viewed from above. By arranging the support portion and the biasing portion between both side portions of the slide rail device in the seat width direction, the device can be made more compact.

[0014] In the above configuration, the rotation axis of the height link is preferably located rearward of the front end of the support portion and forward of the rear end thereof, and the rotation axis of the support portion is preferably located forward of the rotation axis of the height link. The support part supports the rotation axis of the height link, and since the rotation axis of the support part is located forward of the rotation axis of the height link, the support part can support the rear end side of the height link even when ascending, and reverse rotation can be more reliably suppressed.

[0015] In the above configuration, the support portion may include a side support portion that supports a side surface of the height link. By supporting the sides of the height link with the side support parts, shaking of the height link during rotation is suppressed, the biasing force of the biasing part is easily transmitted, and reverse rotation can be suppressed.

[0016] In the above configuration, the height link is composed of a front height link arranged forward in the fore-and-aft direction of the seat and a rear height link arranged rearward, and the front height link is prevented from rotating in the reverse direction by the reverse rotation prevention device, and the rear height link is provided on a rotation axis of the rear height link, and the rotation of the rear height link is restricted by an elevation restriction part that restricts the elevation movement of the seat cushion. During ascent, the lift restrictor can restrict rotation of the rear height link, while the reverse rotation restrictor can restrict reverse rotation of the front height link. [Effects of the Invention]

[0017] According to the vehicle seat of the present invention, by providing a reverse rotation suppression device, it is possible to provide a vehicle seat in which reverse rotation of the height link (link) during ascent is suppressed. In addition, reverse rotation can be suppressed by urging the height link in an upward direction using the urging portion. Furthermore, by providing the support portion, the biasing force of the biasing portion can be efficiently transmitted to the height link. Furthermore, by arranging the support portion of the reverse rotation suppression device on the upper rail, the support portion can slide together with the height link, and reverse rotation of the height link can be suppressed regardless of the sliding position of the upper rail, for example. Furthermore, since the support portion can move in accordance with the rotational movement of the height link, reverse rotation of the height link can be further suppressed. Furthermore, by having the cover portion of the support portion facing the rear end of the height link, for example, the support portion can reliably transmit the biasing force to the height link without slipping relative to the height link. Also, by covering the head of the biasing portion with the cover portion, the biasing portion can be protected. Furthermore, by arranging the support portion and the biasing portion between both side portions of the slide rail device in the seat width direction, the device can be made more compact. In addition, since the support part supports the rotation axis of the height link and the rotation axis of the support part is located forward of the rotation axis of the height link, the support part can support the rear end side of the height link even when ascending, and reverse rotation can be more reliably suppressed. Furthermore, by supporting the sides of the height link with the side support parts, shaking of the height link during rotation is suppressed, the biasing force of the biasing part is easily transmitted, and reverse rotation can be suppressed. Furthermore, during ascent, the lift restrictor can restrict rotation of the rear height link, while the reverse rotation restrictor can restrict reverse rotation of the front height link. [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] 4 is an enlarged perspective view of a part of FIG. 3 showing the periphery of the reverse rotation suppression device. [Figure 12] 12 is a side view showing the periphery of the reverse rotation suppression device as seen from the arrow XII direction in FIG. 11. [Figure 13] FIG. 10 is a diagram showing a state in which the front height link is biased upward by the reverse rotation suppression device. [Figure 14] 6 is an enlarged top view of a part of FIG. 5 showing the periphery of the reverse rotation suppression device. [Figure 15] 1A and 1B are diagrams showing a reverse rotation suppression device having side support portions. [Figure 16] 10A and 10B are diagrams illustrating another example of a reverse rotation suppression device. 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 1, the height link HL, which will be described later, can be rotated 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, unless otherwise specified, the shape, position, and posture of each part of the vehicle seat S described below will be described assuming that the vehicle seat S is in a normal state.

[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 in 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. In some cases, the cushion main body frame 10 corresponds to the first frame, and the height frame 20 corresponds to the second frame in the present invention.

[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 and avoid interference with the slide lock device 63, front connecting bracket 43, and rear connecting bracket 44 arranged 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 reverse rotation inhibiting device 50 provided in the vehicle seat S of this embodiment will be described below mainly with reference to FIGS. 11 to 16. FIG. 11 is an enlarged perspective view of a portion of FIG. 3 showing the periphery of the reverse rotation inhibiting device 50, and FIG. 12 is a side view of the periphery of the reverse rotation inhibiting device 50 as viewed from arrow XII in FIG. 11. FIG. 13 is a view showing a state in which the front height link 22 is biased upward by the reverse rotation inhibiting device 50. FIG. 14 is an enlarged top view of a portion of FIG. 5 showing the periphery of the reverse rotation inhibiting device 50. FIG. 15 is a view showing a reverse rotation inhibiting device having a side support portion 54, and FIG. 16 is a view showing another example of the reverse rotation inhibiting device 50. In the following description, the left front height link 22L shown in the figures will be referred to as the front height link 22.

[0067] The reverse rotation suppression device 50 is a device that suppresses the rotation of the front height link 22 in the reverse direction when the seat cushion 1 is raised from its lowest position. As shown in FIG. 12, the reverse rotation suppression device 50 is provided below the front height link 22 when the vehicle seat S is in a folded position and the seat cushion 1 is in its lowest position (height-down position). By providing the reverse rotation suppression device 50, reverse rotation of the front height link 22 during ascent can be suppressed.

[0068] The reverse rotation suppression device 50 has a biasing portion 51 that biases the front height link 22 in an upward direction, and a support portion 52 that transmits the biasing force of the biasing portion 51 to the front height link 22. The support portion 52 is a substantially L-shaped member when viewed from the side, and has a columnar cover portion 53 that covers the biasing portion 51. In the height-down state, as shown in Figure 12, the front height link 22 presses down on the support portion 52 of the reverse rotation suppression device 50. The cover portion 53 also protects the biasing portion 51.

[0069] Furthermore, when the height of the seat cushion 1 is raised from the height-down state, the front height link 22 rotates upward (in the direction of arrow A in FIG. 13), but at this time, the support portion 52 of the reverse rotation suppression device 50 moves upward (in the direction of arrow B in FIG. 13) due to the biasing portion 51, supporting the front height link 22 from below and encouraging the front height link 22 to rotate upward. Through this operation, the reverse rotation suppression device 50 can suppress reverse rotation of the front height link 22.

[0070] The support portion 52 of the reverse rotation prevention device 50 is disposed on the upper rail 62 of the slide rail device 6. The front height link 22 is rotatably connected to the upper rail 62 by the front connecting bracket 43, so the front height link 22 and the reverse rotation prevention device 50 move together with the sliding movement of the upper rail 62. Therefore, regardless of the sliding position of the upper rail 62, the reverse rotation prevention device 50 can prevent the reverse rotation of the front height link 22.

[0071] Furthermore, the cover portion 53 of the support portion 52 is positioned to face the rear end of the front height link 22 in the seat front-rear direction. By positioning the cover portion 53 in this manner, even if the front height link 22 rotates in the reverse direction, the rear end of the front height link 22 abuts against the cover portion 53, preventing the reverse rotation. Furthermore, the support portion 52 can reliably transmit the biasing force to the front height link 22 without slipping relative to the front height link 22.

[0072] 14, the support portion 52 and the biasing portion 51 of the reverse rotation suppression device 50 are disposed between both side portions (the inner side portion 6a and the outer side portion 6b) in the seat width direction of the slide rail device 6 in a top view. This allows the cushion frame Cf to be made more compact.

[0073] 15, side support portions 54 that support the sides of the front height link 22 may be attached to the support portion 52 of the reverse rotation suppression device 50. Supporting the sides of the front height link 22 with the side support portions 54 suppresses shaking that occurs when the front height link 22 rotates, facilitating the transmission of the biasing force by the biasing portion 51, and more stably suppressing reverse rotation. Note that, although the side support portions 54 shown in FIG. 15 are attached to the outer side portions of the support portion 52, they may also be attached to the inner side portions or both sides of the support portion 52. 14 and 15 have been used to mainly describe the left front height link 22L and the reverse rotation suppression device 50 located on the left side of the seat, but the reverse rotation suppression device 50 may also be provided on the upper rail 62 on the right side of the seat to suppress reverse rotation of the right front height link 22R. Also, the reverse rotation suppression device 50 that suppresses reverse rotation of the rear height link 23 may be provided on the upper rail 62.

[0074] <Modification> Referring to FIG. 16, a reverse rotation suppression device 50A, which is a modified example of the reverse rotation suppression device 50, will be described. In FIG. 16, identical or corresponding components are denoted by the same reference numerals, and redundant description will be omitted. Like the reverse rotation suppression device 50, the reverse rotation suppression device 50A is a component that suppresses reverse rotation of the front height link 22 during ascent. The reverse rotation suppression device 50A has a biasing portion 51A and a support portion 52A, and the head of the biasing portion 51A is covered by a cover portion 53A. The rear end (one end) of the support portion 52A is connected to the biasing portion 51A, and the front end (the other end) is connected to the upper rail 62 via a rotation shaft 52Aa. Therefore, the support portion 52A rotates upward (in the direction of arrow C in FIG. 16) due to the biasing force of the biasing portion 51A.

[0075] The support portion 52A can move in accordance with the rotational movement of the front height link 22, and can more reliably suppress reverse rotation of the front height link 22. 16, the cover portion 53A of the support portion 52A faces the rear end of the front height link 22. Therefore, the support portion 52A can reliably transmit the biasing force to the front height link 22 without slipping relative to the front height link 22.

[0076] As described above, the height link HL, which adjusts the height of the seat cushion 1, is composed of the front height link 22 and the rear height link 23 disposed at the rear. The front height link 22 is prevented from rotating in the reverse direction by the reverse rotation prevention device 50 described above, and the rotation of the rear height link 23 is restricted by the lift restriction unit 71 (see FIGS. 4 and 5) of the lift movable unit 7 provided on the first rotation shaft 23a of the rear height link 23. The lift restriction unit 71 is a device that restricts the lifting and lowering movement of the seat cushion 1 by restricting the rotation of the rear height link 23. By configuring it in this manner, when raising the seat cushion 1, the lifting and lowering restriction unit 71 can suppress rotation of the rear height link 23, while the reverse rotation suppression device 50 can suppress reverse rotation of the front height link 22, thereby more reliably changing the height of the seat cushion 1.

[0077] <Method for manufacturing vehicle seat S> The vehicle seat S (vehicle seat) may be manufactured by a manufacturing method for the vehicle seat S that includes preparing a seat cushion 1, a cushion frame Cf that supports and raises and lowers the seat cushion 1, a height link HL that changes the height of the seat cushion 1 by rotating, and a reverse rotation suppression device 50 that suppresses the height link HL from rotating in the reverse direction when the seat cushion 1 is raised from a height-down state in which the height of the seat cushion 1 is lowest, rotatably attaching the height link HL to the side of the cushion frame Cf, and attaching the reverse rotation suppression device 50 below the height link HL in the height-down state.

[0078] 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]

[0079] 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 6a medial side 6b Outer side 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 biasing spring (biasing means) 71 Lifting control section 75 Stopper part (outer end locking part) 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 HL Height Link (Second Link) 22 Front height link (second link) 22a First rotation axis 22b Second rotation axis 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, 50A reverse rotation suppression device 51, 51A Force section 52, 52A support part 52Aa Rotating shaft 53,53A Cover 54 Side support part 80 Elastic member (rattle suppression member) 9. Seatbelts

Claims

1. Seat cushion and a cushion frame that supports and raises and lowers the seat cushion; a height link that is rotatably connected to a side portion of the cushion frame in the seat width direction and that changes the height of the seat cushion by a rotational movement; a reverse rotation suppression device that is provided below the height link when the seat cushion is in a height-down state where the height of the seat cushion is lowest, and that suppresses the height link from rotating in the reverse direction when the seat cushion is raised from the height-down state.

2. 2. The vehicle seat according to claim 1, wherein the reverse rotation suppression device has a biasing portion that biases the height link in an upward direction.

3. 3. The vehicle seat according to claim 2, wherein the reverse rotation suppression device includes a support portion that transmits the biasing force of the biasing portion to the height link.

4. a slide rail device that slides the seat cushion in the front-rear direction of the seat; The slide rail device is composed of a lower rail fixed to a floor and an upper rail that slides on the lower rail, 4. The vehicle seat according to claim 3, wherein the support portion is disposed on the upper rail.

5. one end of the support portion is connected to the biasing portion, and the other end of the support portion is connected to the upper rail via a rotation shaft; The vehicle seat according to claim 4, wherein the support portion rotates upward due to the biasing force of the biasing portion.

6. the support portion has a cover portion at the one end of the support portion that covers a head portion of the biasing portion, 6. The vehicle seat according to claim 5, wherein the cover portion faces a rear end of the height link in the seat front-rear direction.

7. 6. The vehicle seat according to claim 5, wherein the support portion and the biasing portion are disposed between both side portions of the slide rail device in the seat width direction when viewed from above.

8. The rotation axis of the height link is disposed rearward of the front end of the support portion and forward of the rear end thereof, 6. The vehicle seat according to claim 5, wherein the rotation axis of the support portion is disposed forward of the rotation axis of the height link.

9. 4. The vehicle seat according to claim 3, wherein the support portion includes a side support portion that supports a side surface of the height link.

10. The height link is composed of a front height link disposed forward in the seat front-rear direction and a rear height link disposed rearward, The front height link is prevented from rotating in the reverse direction by the reverse rotation suppression device, 2. The vehicle seat according to claim 1, wherein the rear height link is provided on a rotation axis of the rear height link, and the rotation of the rear height link is restricted by an elevation restriction portion that restricts the elevation movement of the seat cushion.

Images