Vehicle seat

Abstract

To provide a vehicle seat having improved rigidity in the vicinity of a connection portion provided in a height frame.SOLUTION: A vehicle seat S includes a seat cushion 1, the seat cushion 1 can be brought into a collapsed state in which the seat cushion is collapsed. The vehicle seat S includes a dive down link 16 that collapses the seat cushion 1, a height frame 20 that supports and raises and lowers the seat cushion 1 and has a height side frame 21 on a side portion in a seat-width direction, a coupling bracket 43 disposed on a floor side, and a height link HL that has one end rotatably connected to the height side frame 21 and the other end rotatably connected to the coupling bracket and changes height of the seat cushion by rotating. In the height side frame 21, a first reinforcing portion 91 is provided between a first connecting portion 22a between the height side frame 21 and the height link HL and a second connecting portion 16b between the height side frame 21 and the dive down link.SELECTED DRAWING: Figure 12

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 provided with a dive-down link and a height adjustment link for changing the height of the seat cushion. In the seat having a frame (hereinafter referred to as a height frame) that connects the dive-down link and the height adjustment link, each link is connected to the height frame at a connecting part so as to be rotatable, but there is a problem in that the rigidity of the height frame near the connecting part is insufficient.

[0005] 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 having improved rigidity in the vicinity of a connection portion provided to a height frame. [Means for solving the problem]

[0006] The above-mentioned problem is solved by the vehicle seat of the present invention, which is a vehicle seat including a seat cushion and capable of causing the seat cushion to be in a reclined state, the vehicle seat including a dive down link that causes the seat cushion to reclined, a height frame that supports and raises and lowers the seat cushion and has height side frames on the sides in the seat width direction, The problem is solved by providing a connecting bracket arranged on the floor side, and a height link having one end rotatably connected to the height side frame and the other end rotatably connected to the connecting bracket, and changing the height of the seat cushion by rotating, and a first reinforcing part is provided in the height side frame between a first connection part between the height side frame and the height link and a second connection part between the height side frame and the dive down link. By providing a first reinforcing portion between the rotatable first connection portion and the second connection portion, a vehicle seat can be provided with improved rigidity near the connection portion provided on the height frame.

[0007] In the above configuration, the height side frame has a height side frame main portion extending in the fore-and-aft direction of the seat, and an inclined portion extending obliquely from a first bending point on the front side of the height side frame main portion toward the inside of the seat, and the first reinforcing portion may be provided on the inclined portion. By providing the first reinforcing portion at the inclined portion, it is possible to improve the rigidity in the vicinity of the inclined portion.

[0008] In the above configuration, the first reinforcing portion may be provided on an inner surface of the inclined portion in the seat width direction. By reinforcing the inner surface of the inclined portion that extends inward, it is possible to improve rigidity against impacts in the front-rear direction, for example.

[0009] In the above configuration, the height side frame has an extension portion extending from a second bending point on the front side of the inclined portion toward the front of the seat, and the first reinforcing portion may extend continuously from the first bending point to the extension portion in the inclined portion. The first reinforcing portion is continuous to the extending portion, which can further improve rigidity.

[0010] In the above configuration, the height side frame may have a second reinforcing portion at the extension portion, and the second reinforcing portion may be provided on an outer surface of the extension portion in the seat width direction. By providing the first reinforcing portion on the inner surface and the second reinforcing portion on the outer surface, it is possible to further improve rigidity.

[0011] In the above configuration, the second reinforcing portion may extend across the inclined portion and the extending portion. The second reinforcing portion extends across the inclined portion and the extending portion, that is, the second reinforcing portion extends across the bending point of the outer surface, thereby further improving rigidity.

[0012] In the above configuration, the second reinforcing portion may extend in a direction intersecting with a direction in which the first reinforcing portion extends. The second reinforcing portion extends in a direction intersecting the direction in which the first reinforcing portion extends, thereby improving rigidity.

[0013] In the above configuration, the first reinforcing portion and the second reinforcing portion may be disposed at positions overlapping each other in the seat width direction. By arranging the first reinforcing portion and the second reinforcing portion in an overlapping position, the rigidity of the height frame against bending can be improved.

[0014] In the above configuration, the height side frames are provided on both sides of the height frame in the seat width direction, the height links are rotatably connected to each of the height side frames at the first connection portion, and the height frame includes a connecting shaft that connects the height links provided on both sides at the first connection portion, and a height frame member that connects the extension portion of the height side frame, and the first reinforcing portion extends along a virtual line that connects a third connection portion that connects the connecting shaft and the height link, and a fourth connection portion that connects the height frame member and the height side frame. By providing the first reinforcing portion along the imaginary line connecting the third connection portion with the connecting shaft and the fourth connection portion with the height frame member, it is possible to improve rigidity against forces applied from the connecting shaft and the height frame member.

[0015] In the above configuration, the height link is composed of a front height link provided on the front side and a rear height link provided rearward of the front height link, and the height side frame has an outer recess that is recessed toward the outside of the seat at the position where it connects to the rear height link, and may further have a third reinforcing part at a third bending point in front of the outer recess. By providing the third reinforcing portion at the bending point of the outer recess, the rigidity of the high side frame can be further improved. [Effects of the Invention]

[0016] According to the vehicle seat of the present invention, by providing a first reinforcing portion between the rotatable first connection portion and the second connection portion, a vehicle seat can be provided with improved rigidity near the connection portion provided on the height frame. Furthermore, by providing the first reinforcing portion at the inclined portion, it is possible to improve the rigidity in the vicinity of the inclined portion. Furthermore, by reinforcing the inner surface of the inclined portion that extends inward, it is possible to improve rigidity against impacts in the front-rear direction, for example. Furthermore, the first reinforcing portion is continuous to the extending portion, which can further improve rigidity. Furthermore, by providing the first reinforcing portion on the inner surface and the second reinforcing portion on the outer surface, it is possible to further improve rigidity. Furthermore, the second reinforcing portion extends across the inclined portion and the extending portion, that is, the second reinforcing portion extends across the bending point of the outer surface, thereby further improving rigidity. Furthermore, the second reinforcing portion extends in a direction intersecting the direction in which the first reinforcing portion extends, thereby improving rigidity. Furthermore, by arranging the first reinforcing portion and the second reinforcing portion in an overlapping position, the rigidity of the height frame against bending can be improved. In addition, by providing a first reinforcing portion along the imaginary line connecting the third connection portion with the connecting shaft and the fourth connection portion with the height frame member, it is possible to improve rigidity against forces applied from the connecting shaft and the height frame member. Furthermore, by providing a third reinforcing portion at the bending point of the outer recess, the rigidity of the high side frame can be further improved. [Brief explanation of the drawings]

[0017] [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] FIG. 5 is an enlarged view of a part of FIG. 4. [Figure 12] FIG. 10 is a view of the front side of the height side frame as seen from inside the seat. [Figure 13] FIG. 2 is a partially enlarged perspective view showing the front side of the height side frame. [Figure 14] FIG. 10 is a side view of the front side of the height side frame as seen from outside the seat, showing the positions of the second reinforcing portion to the fourth reinforcing portion. [Figure 15] 10 is a view of the front side of the height side frame as seen from the outside of the seat, showing another example of the positions of the second reinforcing portion to the fourth reinforcing portion. FIG. [Figure 16] FIG. 10 is a top view showing a first reinforcing portion and a second reinforcing portion of a second embodiment. [Figure 17] 10 is a partially enlarged perspective view showing the front side of the height side frame, and is a view showing a first reinforcing portion and a second reinforcing portion of a second embodiment. FIG. [Figure 18] FIG. 10 is a side view of the front side of the height side frame as seen from the outside of the seat, illustrating a first reinforcing portion and a second reinforcing portion of a second embodiment. [Figure 19] FIG. 10 is a side view showing the front side of the height side frame as seen from the inside of the seat, illustrating a first reinforcing portion that is another example of the second embodiment. [Figure 20] 10 is a partially enlarged perspective view showing the front side of the height side frame, and shows a fifth reinforcing portion provided in the extension portion. FIG. [Figure 21] FIG. 10 is a side view showing the front side of the height side frame as seen from the outside of the seat, illustrating a sixth reinforcing portion. [Figure 22] FIG. 10 is a partially enlarged perspective view showing the front side of the height side frame, illustrating another example of the fifth reinforcing portion. [Figure 23]FIG. 10 is a side view of the front side of the height side frame as seen from the outside of the seat, illustrating another example of the sixth reinforcing portion. [Figure 24] FIG. 10 is a side view showing the front side of the height side frame as seen from outside the seat, illustrating the position of the first lightweight portion. [Figure 25] FIG. 10 is a side view showing the front side of the height side frame as seen from the inside of the seat, illustrating the position of the second lightweight portion. [Figure 26] FIG. 10 is a side view showing the rear side of the height side frame as seen from inside the seat, illustrating the position of the third lightweight portion. DETAILED DESCRIPTION OF THE INVENTION

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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 seat cushion 1 is set to the lowest position by the height link HL may be referred to as a "height-down state."

[0022] 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.

[0023] 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 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, 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.

[0024] <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 the height-raised state. FIG. 3 is a perspective view showing the seat frame F in the 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 the folded state, and FIG. 5 is a top view showing the seat frame F in the 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 the normal state, and FIG. 7 is an explanatory diagram showing the seat frame F in the reclined state. FIG. 8 is an explanatory diagram showing the seat frame F in the height-raised state, and FIG. 9 is a side view showing the seat frame F in the folded state. FIG. 10 is a cross-sectional view of the cushion frame Cf taken along line XX in FIG. 4. FIG. 11 is an enlarged view of a portion of 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.

[0025] 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.

[0026] <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 framework 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.

[0027] <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.

[0028] 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.

[0029] 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).

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] <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).

[0036] 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.

[0037] 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.

[0038] <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, a front connecting shaft 27a (connecting shaft 27), and a rear connecting shaft 27b (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.

[0039] 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.

[0040] 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 and front connecting bracket 43 disposed on the slide rail device 6. The slide lock device 63 corresponds to the slide restriction unit of the present invention.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 3 and 5, the left and right front height links 22 are connected by a first front height link member 28a. The first front height link member 28a is made of a long, plate-like member. The first front height link member 28a 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. A second front height link member 28b is provided below the front connecting shaft 27a.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] <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.

[0051] <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.

[0052] 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.

[0053] 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.

[0054] The seat back 2 is connected to the seat cushion 1 and can be folded 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).

[0055] <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.

[0056] <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.

[0057] <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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] <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.

[0062] 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 for locking the outer end of the biasing spring 70 .

[0063] <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.

[0064] <Rear connecting bracket 44> 2, 5, and 11, the rear connecting bracket 44 will be described below. As described above, the rear connecting bracket 44 is provided on the upper rail 62 of the slide rail device 6 and is a component that connects the end of the rear height link 23 to the slide rail device 6, and the rear height link 23 is rotatably connected to the rear connecting bracket 44 via the second rotation shaft 23b.

[0065] Additionally, the rear connecting bracket 44 is provided with a rotation restricting portion 45 in front of the rear height link 23, which restricts the forward rotation of the rear height link 23. The rotation restricting portion 45 is formed by bending the front end portion of the plate-shaped rear connecting bracket 44. Since the rotation restriction portion 45 is located in front of the rear height link 23, when the rear height link 23 rotates forward, the side portion 23c in front of the rear height link 23 abuts against the rotation restriction portion 45, thereby restricting the rear height link 23 from rotating forward. By providing the rotation restricting portion 45, the rotation of the rear height link 23 is restricted, thereby improving the stability when the height of the seat cushion 1 is raised (height-raised state). Furthermore, by not providing a rotation restriction portion 45 behind the rear height link 23, the rear height link 23 can be easily rotated rearward, allowing the vehicle seat to be smoothly folded (folded down).

[0066] In this embodiment, when the height of the seat cushion 1 is lowered, the rear height link 23 is rotated rearward. However, if the rear height link 23 is configured to rotate forward, the rotation restriction portion 45 may be provided behind the rear height link 23.

[0067] <Height Side Frame 21> The height side frames 21 of the height frame 20 will be described with reference to FIG. When the vehicle seat S is in a folded state (a reclined state), the lower end of the height frame 20 is configured to descend to the upper surface of the slide rail device 6.

[0068] As described above, the height side frame 21 is rotatably connected to one end of the front height link 22 via the first rotation shaft 22a. The other end of the front height link 22 is rotatably connected to the front connecting bracket 43. The first rotation shaft 22a of the front height link 22 corresponds to the first connection portion of the present invention. The height of the seat cushion can be changed by rotating the front height link 22. The height side frame 21 is rotatably connected to the dive down link 16 at a second rotation shaft 16b. The second rotation shaft 16b of the dive down link 16 corresponds to a second connection portion of the present invention.

[0069] The height side frame 21 is rotatably connected to the front connecting shaft 27a via a connecting shaft rotation shaft 27c. The height side frame 21 is also rotatably connected to the front height frame member 24 via a height frame member rotation shaft 24a. The connecting shaft rotation shaft 27c corresponds to a third connecting portion of the present invention, and the height frame member rotation shaft 24a corresponds to a fourth connecting portion of the present invention.

[0070] The height side frame 21 has a height side frame main portion 21f extending in the front-to-rear direction of the seat. The height side frame main portion 21f is provided in the center of the height side frame 21. The height side frame 21 has an inclined portion 21a3 that extends obliquely toward the inside of the seat from a rear bend point 21a1 (first bend point) in front of the height side frame main portion 21f. The height side frame 21 also has an extension portion 21b that extends toward the front of the seat from a front bend point 21a2 in front of the inclined portion 21a3. The rear bend point 21a1 corresponds to the first bend point of the present invention, and the front bend point 21a2 corresponds to the second bend point.

[0071] 11, the rear portion of the height side frame 21 is bent so as to avoid the rotation restricting portion 45. More specifically, the height side frame 21 is formed with an outer recess 21c that is recessed toward the outside of the seat at a position corresponding to the rear connecting bracket 44 and that avoids the rear connecting bracket 44 including the rotation restricting portion 45. When the vehicle seat S is in the folded state, the outer recess 21c is configured to be positioned further outward from the seat than the rear connecting bracket 44 including the rotation restricting portion 45. More specifically, an extension portion 21d extends rearward from a rear bending point 21c1 at the rear side of the outer recess 21c. A front bending point 21c2 at the front side of the outer recess 21c is connected to the rear end of the main portion 21f of the height side frame. The front bending point 21c2 corresponds to the third bending point.

[0072] In this way, by providing the outer recesses 21c in the height side frames 21, when the vehicle seat S is in a folded state (reclining state), it is possible to avoid the rotation restricting portions 45. As a result, when the vehicle seat S is in a folded state, the rear height links 23 can be reclined until the major axes of the rear height links 23 become substantially horizontal, for example, and the vehicle seat S can be made thinner in the up-down direction.

[0073] 11, the height side frame 21 has an inclined portion 21e that extends inwardly from the rear to the front in front of the outer recess 21c. When the vehicle seat S is in the folded state, the inclined portion 21e is disposed so as to face the rotation restricting portion 45 as shown in FIG. 11. By providing the inclined portion 21e in this manner, the height side frame main portion 21f and the extension portion 21b are positioned inside the seat, and balance with the outer recess 21c in the seat width direction can be achieved, allowing the load from the seat cushion 1 to be supported efficiently.

[0074] <<First Example>> <First reinforcement part 91> A first embodiment of the reinforcing portion will be described using Figures 11 to 15. Figure 11 is an enlarged view of a portion of Figure 4. Figure 12 is a view of the front side of the high side frame 21 as seen from inside the seat. Figure 13 is a partially enlarged perspective view of the front side of the high side frame 21. Figure 14 is a side view of the front side of the high side frame 21 as seen from outside the seat, showing the positions of the second reinforcing portion 92 to the fourth reinforcing portion 94. Figure 15 is a view of the front side of the high side frame 21 as seen from outside the seat, showing another example of the positions of the second reinforcing portion 92 to the fourth reinforcing portion 94.

[0075] 11 to 13, the height side frame 21 is provided with a first reinforcing portion 91 between the first pivot shaft 22a, which is the connection portion with the front height link 22, and the second pivot shaft 16b, which is the connection portion with the dive down link 16. That is, the first reinforcing portion 91 is provided on the inclined portion 21a3 of the height side frame 21. More specifically, the first reinforcing portion 91 is provided on the inner surface of the inclined portion 21a3 in the seat width direction, and extends continuously from the rear bend point 21a1 to the extending portion 21b.

[0076] More specifically, the first reinforcing portion 91 preferably extends along an imaginary line (dotted line A in FIG. 12) connecting the connecting shaft pivot axis 27c, which is the connection portion with the front connecting shaft 27a, and the height frame member pivot axis 24a, which is the connection portion with the front height frame member 24.

[0077] The first reinforcing portion 91 is realized, for example, by a bead formed on the height side frame 21. The first reinforcing portion 91 may also be realized by a partially thickened portion, a stepped portion, a flange, or the like.

[0078] The inclined portion 21a3 of the bent portion 21a is a portion that is easily bent when a force is applied from the front-to-rear direction. By providing a first reinforcing portion 91 between the first pivot shaft 22a, which is the connection portion with the front height link 22, and the second pivot shaft 16b, which is the connection portion with the dive down link 16, the rigidity in the vicinity of the connection portion can be improved. In particular, by arranging the first reinforcing part 91 on the imaginary line connecting the connecting shaft rotation axis 27c and the height frame member rotation axis 24a, it is possible to improve rigidity against forces applied from the front connecting shaft and the height frame member.

[0079] <Second reinforcement part 92> 11 and 14, a second reinforcing portion 92 extending in the seat up-down direction is provided on the extension portion 21b of the height side frame 21. More specifically, the second reinforcing portion 92 is provided on the outer surface of the extension portion 21b in the seat width direction. As shown in FIG. 11, the second reinforcing portion 92 is disposed so as to face the dive down link 16 in the seat front-rear direction. The direction in which the second reinforcing portion 92 extends is not limited to the seat vertical direction, and may extend across the inclined portion 21a3 and the extending portion 21b, as in the case of a second reinforcing portion 92A shown in Fig. 15. In this case, the second reinforcing portion 92A may extend in a direction intersecting with the direction in which the first reinforcing portion 91 provided on the inner surface of the height side frame 21 extends. By providing the second reinforcing portion 92 in this manner, the rigidity of the height side frame 21 can be improved.

[0080] <Third reinforcement part 93> 11 and 14, a third reinforcing portion 93 may be provided at a front bending point 21c2 connecting the outer recess 21c provided in the height side frame 21 and the height side frame main portion 21f. The third reinforcing portion 93 is disposed on the outer surface of the height side frame 21 so as to extend in the seat up-down direction. The direction in which the third reinforcing portion 93 extends is not limited to this, and it may extend across the height side frame main portion 21f and the outer recess 21c, as in the case of a third reinforcing portion 93A shown in FIG.

[0081] <Fourth reinforcement part 94> 11 and 14, a fourth reinforcing portion 94 may be provided at a rear bending point 21c1 connecting the outer recess 21c provided in the height side frame 21 and the height side frame main portion 21f. The fourth reinforcing portion 94 is disposed on the outer surface of the height side frame 21 so as to extend in the seat up-down direction. The direction in which the fourth reinforcing portion 94 extends is not limited to this, and may extend across the outer recess 21c and the extension portion 21d extending rearward from the rear bending point 21c1 of the outer recess 21c, as in the fourth reinforcing portion 94A shown in Figure 15.

[0082] <<Second embodiment>> A second embodiment of the reinforcing portion will be described using Figures 16 to 19. Figure 16 is a top view showing a first reinforcing portion 91B and a second reinforcing portion 92B of the second embodiment, and Figure 17 is a partially enlarged perspective view showing the front side of the height side frame 21, showing the first reinforcing portion 91B and the second reinforcing portion 92B of the second embodiment. Figure 18 is a side view showing the front side of the height side frame 21 as seen from the outside of the seat, showing the first reinforcing portion 91B and the second reinforcing portion 92B of the second embodiment. Figure 19 is a side view showing the front side of the height side frame 21 as seen from the inside of the seat, showing first reinforcing portions 91B and 91C, which are another example of the second embodiment.

[0083] 16 to 18, the first reinforcing portion 91B is provided along the upper end of the height side frame 21. The first reinforcing portion 91B is provided on the inner surface of the height side frame 21, and is positioned above the hole through which the front connecting shaft passes through the height side frame 21.

[0084] 18, the second reinforcing portion 92B is provided along the upper end of the height side frame 21. The second reinforcing portion 92B is provided on the outer surface of the height side frame 21, and extends from the extending portion to the inclined portion. The front height frame member 24 is disposed above the hole through which the height side frame 21 is inserted.

[0085] The first reinforcing portion 91B and the second reinforcing portion 92B are arranged to overlap each other in the seat width direction. The first reinforcing portion 91 reinforces the valley side of the front bending point 21c2 and the valley side of the rear bending point 21c1, thereby improving the rigidity of the bending portion 21a. Furthermore, by arranging the first reinforcing portion 91B and the second reinforcing portion 92B in this manner, when the dive down link tilts rearward, it comes into contact with the first reinforcing portion 91B and acts as a stopper.

[0086] The position of the first reinforcing portion 91B is not limited to the upper end, and may be provided along the lower end of the height side frame 21, as in the case of a first reinforcing portion 91C shown in Fig. 19. Furthermore, the first reinforcing portion 91B may be provided at both the upper and lower ends of the height side frame 21. Similarly, the second reinforcing portion 92B may be provided along the lower end of the outer surface of the height side frame 21, or may be provided at both the upper and lower ends of the height side frame 21.

[0087] <<Third Embodiment>> <Fifth reinforcing portion 95 and sixth reinforcing portion 96> A fifth reinforcing portion 95 and a sixth reinforcing portion 96, which are a second embodiment of the reinforcing portion, will be described using Figures 20 to 23. Figure 20 is a partially enlarged perspective view showing the front side of the height side frame 21, and is a diagram showing the fifth reinforcing portion provided on the extension portion 21b. Figure 21 is a side view showing the front side of the height side frame as seen from the outside of the seat, and is a diagram showing the sixth reinforcing portion 96. Figure 22 is a partially enlarged perspective view showing the front side of the height side frame 21, and is a diagram showing another example of the fifth reinforcing portion 95. Figure 23 is a side view showing the front side of the height side frame 21 as seen from the outside of the seat, and is a diagram showing another example of the sixth reinforcing portion 96.

[0088] 20 , a fifth reinforcing portion 95 may be provided on the extension portion 21b located in front of the height side frame 21 between the height frame member pivot shaft 24a, which is the connection portion with the front height frame member 24, and the second pivot shaft 16b, which is the connection portion with the dive down link 16. The fifth reinforcing portion 95 is provided on the inner surface of the height side frame 21. 21, a sixth reinforcing portion 96 may be provided in the extension portion 21b located in front of the height side frame 21 between the height frame member pivot shaft 24a, which is the connection portion with the front height frame member 24, and the second pivot shaft 16b, which is the connection portion with the dive down link 16. The sixth reinforcing portion 96 is provided on the outer surface of the height side frame 21, and the fifth reinforcing portion 95 is provided on the outer surface of the height side frame 21. The fifth reinforcing portion 95 and the sixth reinforcing portion 96 are arranged in positions where they overlap in the seat width direction. Loads are concentrated on the height frame member pivot shaft 24a provided on the extension portion 21b and the second pivot shaft 16b of the dive down link 16. By providing the fifth reinforcing portion 95 and the sixth reinforcing portion 96 in this manner, the rigidity of the extension portion 21b is improved by reinforcing the extension portion 21b, and it is possible to withstand the load applied to the extension portion 21b.

[0089] 22, fifth reinforcing portions 95A may be disposed along the upper and lower ends of the extension portion 21b located in front of the height side frame 21. The fifth reinforcing portions 95A are provided on the inner surface of the height side frame 21. The height side frame 21 has holes formed therein through which the height frame member pivot shaft 24a and the second pivot shaft 16b pass. The holes through which the height frame member pivot shaft 24a and the second pivot shaft 16b pass are sandwiched between the fifth reinforcing portion 95A at the upper end and the fifth reinforcing portion 95A at the lower end of the extension portion 21b, thereby further improving the rigidity of the extension portion 21b. The fifth reinforcing portion 95A may be formed of a bead or flange portion that does not cross the front bending point 21a2 on the rear side of the extending portion 21b.

[0090] 23, sixth reinforcing portions 96A may be disposed along the upper and lower ends of the extending portion 21b located in front of the height side frame 21. The sixth reinforcing portions 96A are provided on the outer surface of the height side frame 21. The holes through which the height frame member pivot shaft 24a and the second pivot shaft 16b pass are sandwiched between the upper and lower fifth reinforcing portions 95A and 95A, thereby further improving the rigidity of the extension portion 21b. The sixth reinforcing portion 96A may be formed of a bead or flange that does not cross the front bending point 21a2 on the rear side of the extension portion 21b.

[0091] <<Fourth Embodiment>> In the vehicle seat S having the height frame 20 connecting the height link HL and the dive down link 16, the height frame 20 connecting the rotation shafts of the respective links is provided in addition to the cushion main body frame 10 supporting the seat cushion 1. This increases the weight of the entire seat. Therefore, in this embodiment, lightweight portions are provided to reduce the weight of the frame such as the height frame 20, thereby reducing the weight of the entire seat. The lightweight portions are formed, for example, by notches, holes, or thin-walled portions formed in the height side frames 21 of the height frame 20.

[0092] The lightweight portion will be described with reference to Figs. 24 to 26. Fig. 24 is a side view of the front side of the high side frame 21 as seen from outside the seat, showing the position of the first lightweight portion 101. Fig. 25 is a side view of the front side of the high side frame 21 as seen from inside the seat, showing the position of the second lightweight portion. Fig. 26 is a side view of the rear side of the high side frame 21 as seen from inside the seat, showing the position of the third lightweight portion 103.

[0093] <First lightweight part 101> As shown in Figure 24, a first lightweight portion 101 is provided by forming a notch along the lower edge of the height side frame main portion 21f of the height side frame 21. More specifically, the first lightweight portion 101 is provided below the first pivot shaft 22a (first connection portion) of the front height link, i.e., below the connection portion with the front connecting shaft 27a. A shaft hole portion 21i is formed through which the front connecting shaft 27a passes. By providing the first lightweight portion 101 in a portion whose rigidity has been increased by providing the front connecting shaft 27a, it is possible to reduce the weight of the portion whose weight has increased due to the front connecting shaft 27a while maintaining the rigidity of the height link HL.

[0094] More specifically, the first lightweight portion 101 is disposed rearward of the connection portion with the front connecting shaft 27a, i.e., the front end of the shaft hole 21i. By disposing it in this manner, it is possible to reduce the weight while maintaining the rigidity of the bending portion side. Furthermore, the first lightweight portion 101 extends rearward from the rear end of the connection portion with the front connecting shaft 27a (the shaft hole 21i). This further reduces the weight of the height side frame main portion 21f. Furthermore, the first lightweight portion 101 is disposed forward of the downward inclined portion 21g of the height side frame main portion 21f. As shown in FIG. 25, the height side frame main portion 21f is formed with a tapered portion 21h that is short in the up-down direction. The first lightweight portion 101 is disposed forward of the downward inclined portion 27g that forms the tapered portion 21h. It is possible to reduce the weight while maintaining the rigidity of the tapered portion 21h.

[0095] <Second lightweight part 102> As shown in FIG. 25, a second lightweight portion 102 may be provided in the vicinity of a reinforcing portion provided on the inclined portion 21a3 of the height side frame 21. For example, the second light weight portion 102 may be formed between the first reinforcing portions 91D provided on the upper and lower sides of the inclined portion 21a3. The second lightweight portion 102 may be formed between the second reinforcing portion 92D provided along the front bending point 21a2 on the front side of the inclined portion 21a3 and the rear bending point 21c1 on the rear side thereof. Two second reinforcing portions 92D may be provided on the inner surface side of the height side frame 21 and arranged to connect the front and rear ends of the first reinforcing portions 91D provided on the upper and lower sides. In this case, the second light weight portion 102 is surrounded by the first reinforcing portion 91D and the second reinforcing portion 92D. The second light weight portion 102 is formed by a hole portion. The second light weight portion 102 may be realized by forming a thin-walled portion. By providing the first reinforcing portion 91D or the second reinforcing portion 92D, the rigidity of the height link HL can be increased, and by forming the second lightweight portion 102, the weight can be reduced.

[0096] <Third lightweight part 103> As shown in Figure 26, the third light weight portion 103 is formed behind the height side frame 21. More specifically, the third light weight portion 103 is located behind the rear bending point 21c1 of the outer recess 21c of the height side frame 21. The third light weight portion 103 is also located forward of the front end of the lift-up movable unit 7. More specifically, the third light weight portion 103 is located forward of the rear connecting shaft 27b of the lift-up movable unit 7 that lifts the height frame 20. The third lightweight portion 103 is formed of a hole or a thin portion. The provision of the rear connecting shaft 27b and the liftable portion 7 increases rigidity but also increases weight. By providing the third lightweight portion 103, it is possible to reduce weight while maintaining the rigidity of the height side frame 21 around the liftable portion 7.

[0097] 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.

[0098] The fourth embodiment will be described below. <Additional Notes> (Appendix 1) A vehicle seat including a seat cushion, the seat cushion being capable of being reclined, a dive down link that collapses the seat cushion; a height frame that supports the seat cushion and raises and lowers it, and has height side frames on the sides in the seat width direction; A connecting bracket disposed on the floor side; a height link having one end rotatably connected to the height side frame and the other end rotatably connected to the connecting bracket, and configured to change the height of the seat cushion by rotating; A vehicle seat, characterized in that a first lightweight portion is provided in the height side frame. (Appendix 2) The height side frame has a height side frame main portion extending in the seat front-rear direction and an inclined portion extending obliquely toward the inside of the seat from a first bending point on the front side of the height side frame main portion, 2. The vehicle seat according to claim 1, wherein the first lightweight portion is provided on the height side frame main portion. (Appendix 3) The height side frame main portion is provided with a first connection portion that connects to the rotation axis of the height link, The vehicle seat according to claim 2, wherein a notch is formed as the first lightweight portion below the first connection portion. (Appendix 4) The height side frame main portion is formed with a narrowed portion having a short length in the seat up-down direction, The vehicle seat according to claim 3, wherein the first light weight portion is disposed rearward of the first connecting portion and forward of the tapered portion. (Appendix 5) The inclined portion is provided with a first reinforcing portion and a second lightweight portion, 5. The vehicle seat according to claim 4, wherein the second lightweight portion is disposed at a position that overlaps the first reinforcing portion in the up-down direction in a side view. (Appendix 6) the first reinforcing portion extends along an upper end of the inclined portion and a lower end of the inclined portion, The vehicle seat described in Appendix 5, characterized in that a hole portion as the second lightweight portion is arranged between the first reinforcing portion at the upper end of the inclined portion and the first reinforcing portion arranged along the lower end of the inclined portion. (Appendix 7) a second reinforcing portion connecting a front end and a rear end of the first reinforcing portion, 7. The vehicle seat according to claim 6, wherein the hole is surrounded by the first reinforcing portion and the second reinforcing portion. (Appendix 8) The height link is composed of a front height link provided on the front side and a rear height link provided rearward of the front height link, The height side frame has an outer recess formed therein that is recessed toward the outside of the seat at a position where the height side frame is connected to the rear height link, 8. The vehicle seat according to claim 7, further comprising a third lightweight portion rearward of a rear bending point on the rear side of the outer recess. (Appendix 9) a cushion frame that supports and raises and lowers the seat cushion; a pair of height links rotatably connected to both side portions of the cushion frame in the seat width direction and adapted to change the height of the seat cushion by pivoting; a connecting shaft that connects the pair of height links; a lifting and lowering movable portion having a lifting and lowering restriction portion that restricts the lifting and lowering of the seat cushion, 9. The vehicle seat according to claim 8, wherein in the height side frame, the third light weight portion is provided forward of the front end of the liftable portion. [Explanation of symbols]

[0099] 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 (slide control part) 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) 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 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 rotating shaft (second connecting portion) 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 21f Height side frame main part 21a Bend part 21a1 Posterior bending point (first bending point) 21a2 Front bending point (second bending point) 21a3 Sloped part (slanted part) 21b Extension 21c Outer recess 21c1 Posterior bending point 21c2 Anterior bending point (third bending point) 21e Slope 21g downward slope 21h Squeezing section 21i Shaft hole HL Height Link 22 Front height link 22a First rotating shaft (first connection part) 22b Second rotation axis 22R Right front height link 22L left front height link 23 Rear height link 23a First rotation axis 23b Second rotation axis 23c Side 23R Right rear height link 23L Left rear height link 24 Front height frame member 24a Height frame member pivot axis (fourth connection part) 25 Mid-height frame member 26 Rear height frame member 27 Connecting shaft 27a Front connecting shaft 27b Rear connecting shaft 27c Connecting shaft rotating shaft (third connection part) 28a First forward height link member 28b Second 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 45 Rotation control part 50 Reverse rotation suppression device 91, 91B, 91D First reinforcement section 92, 92A, 92B, 92D Second reinforcement part 93, 93A Third reinforcement part 94, 94A Fourth reinforcement section 95, 95A Fifth reinforcement section 96, 96A Sixth reinforcement part 101 First Lightweight Division 102 Second Lightweight Division 103 Third Lightweight Division

Claims

1. A vehicle seat including a seat cushion, the seat cushion being capable of being reclined, a dive down link for lowering the seat cushion; a height frame for supporting and raising / lowering the seat cushion and having height side frames on the sides in the seat width direction; A connecting bracket disposed on the floor side; a height link having one end rotatably connected to the height side frame and the other end rotatably connected to the connecting bracket, and configured to change the height of the seat cushion by rotating; A vehicle seat characterized in that a first reinforcing portion is provided in the height side frame between a first connection portion between the height side frame and the height link and a second connection portion between the height side frame and the dive down link.

2. The height side frame has a height side frame main portion extending in the seat front-rear direction and an inclined portion extending obliquely toward the inside of the seat from a first bending point on the front side of the height side frame main portion, The vehicle seat according to claim 1 , wherein the first reinforcing portion is provided on the inclined portion.

3. The vehicle seat according to claim 2, wherein the first reinforcing portion is provided on an inner surface of the inclined portion in the seat width direction.

4. the height side frame has an extension portion that extends from a second bending point on the front side of the inclined portion toward the front of the seat, The vehicle seat according to claim 3, wherein the first reinforcing portion extends continuously from the first bending point to the extending portion in the inclined portion.

5. The height side frame has a second reinforcing portion on the extension portion, The vehicle seat according to claim 4, wherein the second reinforcing portion is provided on an outer surface of the extension portion in the seat width direction.

6. The vehicle seat according to claim 5, wherein the second reinforcing portion extends across the inclined portion and the extending portion.

7. The vehicle seat according to claim 6, wherein the second reinforcing portion extends in a direction intersecting with a direction in which the first reinforcing portion extends.

8. The vehicle seat according to claim 5, wherein the first reinforcing portion and the second reinforcing portion are arranged at positions overlapping each other in the seat width direction.

9. The height side frames are provided on both sides of the height frame in the seat width direction, The height link is rotatably connected to each of the height side frames at the first connection portion, The height frame is A connecting shaft that connects the height links provided on both sides at the first connection portion; a height frame member that connects the extension portions of the height side frames, The vehicle seat according to claim 8, wherein the first reinforcing portion extends along a virtual line connecting a third connection portion that connects the connecting shaft and the height link and a fourth connection portion that connects the height frame member and the height side frame.

10. The height link is composed of a front height link provided on the front side and a rear height link provided rearward of the front height link, The height side frame has an outer recess formed therein that is recessed toward the outside of the seat at a position where the height side frame is connected to the rear height link, 10. The vehicle seat according to claim 9, further comprising a third reinforcing portion at a third bending point in front of the outer recess.

Images