JP7662933B2 - Vehicle seats - Google Patents

Description

The present invention relates to a vehicle seat, and in particular to a vehicle seat that has a cushion frame that serves as the framework for the seat cushion.

As described in Patent Document 1, a vehicle seat is known that includes a cushion frame that forms the framework of the seat cushion, and the cushion frame has side frames arranged on the left and right sides, a forward connecting pipe that connects the front portions of the left and right side frames, and a rear connecting pipe that connects the rear portions of the left and right side frames.

JP 2018-199359 A

Incidentally, in a vehicle seat such as that disclosed in Patent Document 1, there has been a demand for manufacturing frame components at lower manufacturing costs than in the past while still ensuring the rigidity of the cushion frame.
For example, by manufacturing most of the frame components by press molding, it is possible to reduce manufacturing costs compared to manufacturing by conventional die molding.

The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a vehicle seat that can reduce the manufacturing costs of the seat frame while ensuring the rigidity of the seat frame, which forms the skeleton of the vehicle seat.
Another object of the present invention is to provide a vehicle seat in which the manufacturing costs of the seat frame can be reduced by manufacturing the frame components by press molding.

The above-mentioned problem is solved by the vehicle seat of the present invention, which provides a vehicle seat including a cushion frame that serves as a skeleton of a seat cushion, the cushion frame including side frames disposed on the left and right sides in a seat width direction and extending in a seat front-rear direction, and a connecting frame that connects front and rear portions of the left and right side frames, the connecting frame having an open cross-sectional shape with an opening formed on one side in the up-down direction or one side in the seat front-rear direction, and extending toward an inner surface of the side frame , the connecting frame extending longitudinally in the seat width direction, and a frame main body having the open cross-sectional shape. The problem is solved by the connecting frame having a reinforcing portion and a flange portion provided at an extending end of the frame main body portion and formed to protrude outward from the extending end, wherein the frame main body portion and the flange portion are provided as one piece rather than separate bodies, the flange portion is formed along the inner surface of the side frame and abuts the inner surface of the side frame, the connecting frame is formed from a plate-shaped frame and has a pair of opposing wall portions provided at a predetermined interval, a connecting wall portion connecting the pair of opposing wall portions, and a reinforcing recess formed as a recess in the outer surface of the connecting frame and extending along the extending direction of the connecting frame .
With the above configuration, it is possible to realize a vehicle seat that can reduce manufacturing costs while ensuring the rigidity of the seat frame.
More specifically, the connecting frame has an open cross-sectional shape with an opening formed on one side in the up-down direction or one side in the seat front-rear direction, and extends toward the inner surface of the side frame. Therefore, the connecting frame can be manufactured by, for example, press molding. As a result, manufacturing costs can be reduced compared to the case of a conventional connecting pipe (conventional connecting pipes cannot be manufactured by press molding).
In other words, by giving the connecting frame an open cross-sectional shape, it is possible to reduce the manufacturing costs of the connecting frame while ensuring rigidity.

In this case, a height link device is provided that connects the cushion frame to the vehicle floor so that it can be raised and lowered, the height link device having left and right links provided between the cushion frame and the vehicle floor, the frame main body portion connects so as to penetrate the left and right links, and the flange portion is formed so as to bend and protrude from the extended end of the frame main body portion at a position outer than the left and right links in the seat width direction .

In this case, the pair of opposing wall portions are arranged at a predetermined interval in the fore-and-aft direction of the seat, the connecting wall portion connects the upper ends of the pair of opposing wall portions, the connecting frame has an open cross-sectional shape in which the opening is formed on the lower side of the connecting frame , and the reinforcing recesses are preferably formed in multiple portions at intervals in the seat width direction .
The above-described configuration of the connecting frame enables the cushion frame to efficiently receive the seating load of a seated person.
Moreover, the above-described configuration can prevent foreign matter from entering the inside of the connecting frame.

In this case, it is preferable that the reinforcing recess is disposed apart from the flange portion in the seat width direction.
In addition, it is preferable that the flange portion and the side frame are welded in a state of abutment with each other, so that a weld mark is formed on the flange portion .
With the above-described configuration, the connecting frame can be firmly attached to the inner surface of the side frame.

In this case, the flange portion has a first flange portion and a second flange portion formed to protrude in opposite directions from the extending ends of the pair of opposing wall portions, and a third flange portion formed to protrude outward from the extending end of the connecting wall portion , and the reinforcing recess is preferably positioned away from the flange portions in the sheet width direction .
With the above-described configuration, the connecting frame can be more firmly attached to the inner surface of the side frame.

In this case, the seat cushion is constructed by placing a cushion material on the cushion frame and covering it with a skin material, the side frame has a plurality of skin hook-up portions formed on the side surface of the side frame for hooking terminal portions of the skin material, and the connecting frame is disposed at a position between the plurality of skin hook-up portions on the side surface of the side frame and is attached by abutting against a flat portion of the side frame.
With the above-described configuration, the connecting frame can be firmly attached to the side surface of the side frame while suppressing interference with the skin hook-retaining portion.
Furthermore, since the connecting frame is attached between the plurality of skin hook-retaining portions, the rigidity of the skin hook-retaining portions and the surrounding areas can be increased.

In this case, the connecting frame connects the front portions of the left and right side frames, and the cushion frame further has a plate-shaped pan frame connecting the front end portions of the left and right side frames, a rear connecting frame connecting the rear portions of the left and right side frames, and a plurality of elastic springs hooked to the pan frame and the rear connecting frame and extending in the fore-and-aft direction of the seat, and the connecting frame is formed so that its upper surface is flat, and is positioned rearward of the pan frame and lower than the plurality of elastic springs , and the elastic springs are attached to the connecting wall portion of the rear connecting frame via a hook member .
In addition, the connecting frame connects the front portions of the left and right side frames, and the cushion frame is provided with a plate-shaped pan frame connecting the front end portions of the left and right side frames, and the front end portion of the pan frame is preferably formed with a bent portion by bending the tip of the front end portion.
As described above, since the upper surface of the connecting frame is flat, when the elastic spring is bent in the vertical direction due to the seating load of the seated person, the connecting frame can receive the elastic spring with a surface thereof. As a result, compared to the case of the conventional connecting pipe, the seating comfort of the seated person can be maintained in a preferable manner even when the seated person is seated deep in the vehicle seat.

According to the present invention, it is possible to realize a vehicle seat that can reduce manufacturing costs while ensuring the rigidity of the seat frame. Specifically, by manufacturing the frame components by press molding, it is possible to reduce the manufacturing costs of the seat frame.
Furthermore, according to the present invention, the rigidity of the connecting frame can be increased while suppressing the manufacturing costs of the connecting frame.
Furthermore, according to the present invention, the cushion frame can efficiently receive the seating load of a seated occupant, and the intrusion of foreign matter into the connecting frame can be suppressed.
Furthermore, according to the present invention, the connecting frame can be firmly attached to the inner surface of the side frame.
Furthermore, according to the present invention, in a vehicle seat equipped with a height link device, the assembly rigidity of the height link device (link) can be increased while suppressing the manufacturing costs of the frame components.
According to the present invention, the connecting frame can be firmly attached to the side surface of the side frame while suppressing interference with the skin hook-retaining portion. Also, the rigidity of the skin hook-retaining portion and its surrounding area can be increased.
Furthermore, according to the present invention, the seating comfort of the seated occupant can be maintained in a favorable manner, even when the occupant is seated deep in the vehicle seat, as compared with the conventional seat.

1 is a perspective view showing a vehicle seat according to an embodiment of the present invention; FIG. 2 is a perspective view showing a seat frame that serves as a framework of the vehicle seat. FIG. 4 is an enlarged view of a main portion of the cushion frame, and is a perspective view showing a side frame and a connecting frame. FIG. FIG. FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5 . FIG. 13 is a perspective view showing a first modified example of the connecting frame. FIG. 11 is a perspective view showing a second modified example of the connecting frame. FIG. 11 is a perspective view showing a third modified example of the connecting frame. FIG. 13 is a perspective view showing a first modified example of a side frame.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle seat according to an embodiment of the present invention will be described below with reference to FIGS.
This embodiment relates to an invention for a vehicle seat having a cushion frame that forms the skeleton of the seat cushion, the cushion frame being arranged on the left and right sides in the width direction of the seat and having side frames extending in the front-to-rear direction of the seat, and a connecting frame that connects the front or rear portions of the left and right side frames, the connecting frame having an open cross-sectional shape with an opening formed on one side in the up-down direction or one side in the front-to-rear direction of the seat, and extending toward the inner surface of the side frame.
In addition, the side of the vehicle seat on which a seat occupant sits relative to the seat back is the front side of the seat.

As shown in FIG. 1, the vehicle seat S of this embodiment is a vehicle seat, and is mainly composed of a seat body having a seat back 1 and a seat cushion 2, and as shown in FIG. 2, a rail device 3 that supports the seat body so that it can move back and forth relative to the vehicle floor, a height link device 4 that connects the seat body to the vehicle floor so that it can be raised and lowered, and a reclining device 5 that connects the seat back 1 to the seat cushion 2 so that it can be rotated.

As shown in FIG. 1, the seat back 1 is a backrest portion that supports a seated occupant from behind, and is configured by placing a cushion material 1a on a back frame 10 shown in FIG. 2, which serves as a skeleton, and covering it with a skin material 1b.
The seat cushion 2 is a seating portion that supports a seated person from below, and is configured by placing a cushion material 2a on a cushion frame 20 that serves as a skeleton shown in FIG. 2 and covering it with a skin material 2b.

As shown in Figure 2, the rail device 3 is disposed between the seat body and the vehicle floor in the vertical direction, and is mainly composed of left and right lower rails 3a that are fixed to the vehicle floor and extend in the front-to-rear direction of the seat, left and right upper rails 3b that are supported slidably along the lower rails 3a, a locking member (not shown) that locks the upper rails 3b against the lower rails 3a so that they cannot slide, and a rail operating lever 3c that releases the locked state of the locking member.
A cushion frame 20 is mounted on the upper surfaces of the left and right upper rails 3b via height link devices 4.

As shown in FIG. 2, the height link device 4 is attached between the rail device 3 and the cushion frame 20, and is mainly composed of left and right first links 4a arranged on the front side of the seat, left and right second links 4b arranged on the rear side of the seat, a locking member (not shown) that locks the seat body so that it cannot be raised or lowered, and a height operation lever 4c for releasing the locked state of the locking member. The second link 4b acts as a driving link, making it possible to adjust the height of the seat body.

As shown in FIG. 2, the reclining device 5 is mainly composed of a reclining body 5a that is driven when rotating the back frame 10, a rotation shaft 5b, a spiral spring 5c that urges the back frame 10 to rotate forward around the rotation shaft 5b, and a reclining operation lever 5d shown in FIG. 1 that is operated to release the locked state of the back frame 10.

The reclining body 5 a has a known locking mechanism, and the state of the back frame 10 can be switched between a locked state in which it is fixed to the cushion frame 20 and an unlocked state in which it is rotatable relative to the cushion frame 20 .
The rotating shaft 5b is supported on the back frame 10 side and the cushion frame 20 side in the seat width direction, and the spiral spring 5c has one end engaged with the back frame 10 side and the other end engaged with the cushion frame 20 side.

As shown in FIG. 2, the back frame 10 is a substantially rectangular frame-like body and is mainly composed of back side frames 11 arranged on the left and right sides, an inverted U-shaped upper frame 12 connecting the upper end portions of each back side frame 11, a plate-shaped lower frame 13 connecting the lower end portions of each back side frame 11, and elastic springs (not shown) that are hooked onto each back side frame 11 and extend in a snake-like shape.
The back side frame 11 is a sheet metal member that extends in the vertical direction and has a generally C-shaped cross section, and the lower end portion thereof is connected to the rear end portion of the side frame 21 via the reclining device 5.

As shown in Figures 2 to 5, the cushion frame 20 is a generally rectangular frame-shaped body and is mainly composed of side frames 21 arranged on the left and right sides and extending in the front-to-rear direction of the seat, a plate-shaped pan frame 22 connecting the front end portions of each side frame 21, a front connecting frame 30 connecting the front portions of each side frame 21, a rear connecting frame 40 connecting the rear portions of each side frame 21, and multiple elastic springs 23 hooked onto the pan frame 22 and the rear connecting frame 40 and extending in a snake-like shape in the front-to-rear direction of the seat.

As shown in Figures 2 to 4, the side frame 21 is a long plate-shaped frame in the fore-and-aft direction of the seat, and has a frame main body portion 21a, and an upper end flange portion 21b and a lower end flange portion 21c that bend and protrude inward in the seat width direction from the upper end and lower end, respectively, of the frame main body portion 21a.
The side frame 21 has a skin hook portion 21d formed by cutting out a part of the side surface of the side frame 21 and for hooking an end portion of the skin material 2b.
A plurality of cover hook-retaining portions 21d are formed at predetermined intervals in the front-rear direction of the seat.
In addition, a reclining device 5 is attached to the rear end of the side frame 21.

As shown in Figures 2, 5, and 6, the pan frame 22 is a frame that supports the thighs of a seated occupant and consists of a roughly rectangular plate body, with both end portions in the seat width direction placed on and attached to the upper surfaces of the side frames 21.
A bent portion 22a is formed at the front end portion of the pan frame 22 by bending the tip of the front end portion upward.
Similarly, bent portions 22b, 22c are formed at both ends of the pan frame 22 in the seat width direction.

The bent portion 22a is formed continuously so as to extend along the sheet width direction, and specifically, is formed by curling processing.
The bent portions 22b, 22c are formed continuously so as to extend along the front-rear direction of the seat.
Therefore, manufacturing costs (mold costs) can be reduced compared to conventional hemming and drawing processes.

As shown in FIG. 2, the elastic springs 23 are elastic support members that support the buttocks of a seated occupant, and a plurality of elastic springs 23 are provided at predetermined intervals in the seat width direction.
The front end portion of the elastic spring 23 is hooked to the edge of a hook hole (not shown) formed in the upper surface of the pan frame 22. The rear end portion of the elastic spring 23 is attached to the rear connecting frame 40 via a hook member.

As shown in Figs. 3 and 4, the front connecting frame 30 and the rear connecting frame 40 have an open cross-sectional shape with an opening formed on the lower side, and are frames that are long in the seat width direction.
The connecting frames 30, 40 are formed from plate-shaped frames by, for example, press molding.
The connecting frames 30, 40 connect the left and right side frames 21 together, and also connect the left and right links (first link 4a, second link 4b).

Specifically, the forward connecting frame 30 extends longitudinally in the seat width direction and has a frame main body portion 31 having an open cross-sectional shape, and a flange portion 32 that is provided at the extending end of the frame main body portion 31 and is cut out so as to protrude outward from the extending end.
The rear connecting frame 40 also has a similar configuration, and includes a frame main body portion 41 and a flange portion 42 .
The rear connection frame 40 will be described in detail below with reference to Figs. 3 and 4, and a detailed description of the front connection frame 30 will be omitted.

The frame main body 41 has a pair of opposing walls 41a, 41b spaced a predetermined distance apart in the seat front-rear direction, and a connecting wall 41c connecting the upper ends of the pair of opposing walls 41a, 41b.
A reinforcing recess 43 is formed as a recess on the outer surface of the opposing wall portions 41 a, 41 b and extends along the extension direction of the rear connecting frame 40 .
In addition, a reinforcing protrusion 44 is formed as a protrusion on the outer surface of the connecting wall portion 41 c and extends along the extension direction of the rear connecting frame 40 .

The flange portion 42 is formed along the inner surface of the side frame 21 and abuts against the inner surface of the side frame 21 .
Specifically, the flange portion 42 has a first flange portion 42a and a second flange portion 42b formed to protrude in opposite directions from the extended ends of a pair of opposing wall portions 41a, 41b, and a third flange portion 42c formed to protrude outward (upward) from the extended end of the connecting wall portion 41c.

In the above configuration, as shown in FIG. 4, the flange portion 42 and the side frame 21 are welded (for example, laser welded) in abutting contact with each other, so that weld marks 45 are formed on the flange portions 42a, 42b, and 42c.
Therefore, the rear connecting frame 40 can be firmly attached to the inner surface of the side frame 21.
For example, the rear connecting frame 40 (flange portion 42) may be attached to the side frame 21 using a mounting member.

3, the front connecting frame 30 is disposed between the plurality of skin hooking portions 21d on the side surface of the side frame 21. The front connecting frame 30 is attached in contact with the flat portion of the side frame 21.
Therefore, the front connecting frame 30 can be firmly attached to the side surface of the side frame 21 while suppressing interference with the skin hook retaining portion 21d.
In addition, the rigidity of the skin hook-retaining portion 21d and its surrounding area can be increased.

In the above configuration, as shown in Figures 2 and 3, the front connecting frame 30 is formed so that its upper surface is flat, and is positioned rearward of the pan frame 22 and below the multiple elastic springs 23.
Therefore, when the elastic spring 23 is bent in the vertical direction due to the seating load of the seated occupant, the front connecting frame 30 can receive the elastic spring 23 on its surface. As a result, compared to the case of a conventional connecting pipe, the seating comfort of the seated occupant can be favorably maintained even when the seated occupant is seated deep in the vehicle seat S.

<Modification 1-3 of the connecting frame>
Next, modified example 1-3 of the connecting frame will be described with reference to FIGS. 7A, 7B, and 7C.
It should be noted that the description of the same contents as those of the connecting frames 30 and 40 described above will be omitted.
The connecting frame of the modified example 1-3 has a different open cross-sectional shape compared to the connecting frames 30 and 40.
The rear connection frames 140, 240, 340 will be described in detail below, and details of the front connection frames will be omitted.

As shown in FIG. 7A , the rear connecting frame 140 of variant example 1 has a frame main body portion 141 having an open cross-sectional shape, and a flange portion 142 formed to protrude outward from the extended end portion of the frame main body portion 141.
The frame main body 141 has a generally U-shaped vertical cross section, and includes a pair of opposing walls 141a, 141b, and a connecting wall 141c that connects upper ends of the pair of opposing walls 141a, 141b.
The connecting portions between the opposing walls 141a, 141b and the connecting wall 141c are rounded and chamfered.

The flange portion 142 abuts against the inner surface of the side frame 21 .
The flange portion 142 has a first flange portion 142a and a second flange portion 142b formed to protrude in opposite directions from the extended ends of a pair of opposing wall portions 141a, 141b, and a third flange portion 142c formed to protrude outward (upward) from the extended end of the connecting wall portion 141c.
Even with the above configuration, the frame components can be manufactured by press molding, making it possible to realize a vehicle seat that enables manufacturing costs of the seat frame to be reduced.

As shown in FIG. 7B , the rear connecting frame 240 of the second modified example has a frame main body portion 241 having an open cross-sectional shape, and a flange portion 242 .
The frame main body 241 has an inverted V-shape in vertical cross section, and has a pair of opposing wall portions 241a, 241b.
The upper end of the first opposing wall portion 241a and the upper end of the second opposing wall portion 241b are connected to each other.

The flange portion 242 has a first flange portion 242a and a second flange portion 242b formed so as to protrude in opposite directions from the extended ends of the pair of opposing wall portions 241a, 241b.
The first flange portion 242a extends in a direction perpendicular to the extending direction of the first opposing wall portion 241a, and is formed along the inner surface of the side frame 21. The second flange portion 242b is formed in the same manner.
Even with the above configuration, the frame components can be manufactured by press molding, making it possible to realize a vehicle seat that enables manufacturing costs of the seat frame to be reduced.

As shown in FIG. 7C , a rear connection frame 340 of the third modified example has a frame main body portion 341 having an open cross-sectional shape, and a flange portion 342 .
The frame main body 341 has a generally hat-shaped longitudinal cross section and includes a pair of opposing wall portions 341a, 341b, a connecting wall portion 341c connecting the upper ends of the pair of opposing wall portions 341a, 341b, a first protruding wall portion 341d protruding outward from the extending end portion of the first opposing wall portion 341a, and a second protruding wall portion 341e protruding outward from the extending end portion of the second opposing wall portion 341b.
The first protruding wall portion 341d and the second protruding wall portion 341e protrude in opposite directions from each other.

The flange portion 342 abuts against the inner surface of the side frame 21 .
The flange portion 342 has a first flange portion 342a and a second flange portion 342b formed to protrude in opposite directions from the extending ends of a pair of opposing wall portions 341a, 341b, a third flange portion 342c formed to protrude outward (upward) from the extending end of the connecting wall portion 341c, and a fourth flange portion 342d and a fifth flange portion 342e formed to protrude outward (downward) from the extending ends of the first protruding wall portion 341d and the second protruding wall portion 341e, respectively.
Even with the above configuration, the frame components can be manufactured by press molding, making it possible to realize a vehicle seat that enables manufacturing costs of the seat frame to be reduced.

<Side Frame Modification 1>
Next, a first modified example of the side frame will be described with reference to FIG.
The side frame 121 is a long plate-shaped frame in the fore-and-aft direction of the seat, and has a frame main body portion 121a, and an upper end flange portion 121b and a lower end flange portion 121c which bend and protrude outward in the seat width direction from the upper and lower ends, respectively, of the frame main body portion 121a.
Further, the side frame 121 (frame main body 121a) has a truss structure constituted by an assembly of triangles, trapezoids (squares), and the like.
Specifically, the side frame 121 has a plurality of reinforcing portions 121e each having a triangular shape and a plurality of reinforcing portions 121f each having a trapezoidal shape.

The reinforcing portion 121e is a through hole formed by burring. More specifically, the edge portion of the reinforcing portion 121e is formed so as to protrude outward or inward in the seat width direction from the frame main body portion 121a.
The reinforcing portion 121f is also formed by burring in a similar manner.

The side frame 121 is formed by cutting out a part of the side surface of the side frame 21 and has a skin hook-fastening portion 121d for hooking an end portion of a skin material.
The cover hook retaining portion 121d is disposed between the multiple reinforcing portions 121e, 121f in the seat front-rear direction.

The above configuration makes it possible to realize a vehicle seat that can reduce manufacturing costs while increasing the rigidity of the seat frame.

<Other embodiments>
In the above embodiment, as shown in FIG. 5, the connecting frames 30, 40 each have an open closed cross-sectional shape, but this is not particularly limited, and only the front connecting frame 30 may have an open closed cross-sectional shape, or only the rear connecting frame 40 may have an open closed cross-sectional shape.

In the above embodiment, as shown in FIG. 3, the connecting frames 30, 40 have an open cross-sectional shape with an opening formed on the lower side thereof, but this is not particularly limited and can be modified.
For example, the connecting frames 30, 40 may have an open cross-sectional shape with openings formed on their upper, front or rear sides.
Also, for example, the connecting frames 30, 40 may have an open cross-sectional shape with openings formed on their front diagonally lower side, front diagonally upper side, rear diagonally lower side, or rear diagonally upper side.
In other words, the connecting frames 30, 40 may have an open cross-sectional shape with an opening formed on one side in the up-down direction or on one side in the seat front-rear direction. This includes all of the above configurations.

In the above embodiment, as shown in Figures 2 and 3, the connecting frames 30, 40 connect the left and right side frames 21 and also connect the left and right links 4a, 4b, but this is not limited to this and can be modified.
For example, the front connecting frame 30 may be a connecting frame that performs the function of suppressing the submarine phenomenon in which a seated occupant sinks in the event of a vehicle collision.

In the above embodiment, as shown in FIG. 3, the extending ends of the connecting frames 30, 40 are attached in contact with the inner side surface of the side frame 21, but this is not particularly limited and can be modified.
For example, the extending ends of the connecting frames 30, 40 may be attached so as to pass through the side frames.

In the above embodiment, as shown in FIG. 3, the rear connecting frame 40 has the reinforcing recess 43 and the reinforcing protrusion 44 extending along the extension direction thereof, but this is not particularly limited and can be modified.
For example, the rear connecting frame 40 may have only the reinforcing recess 43 or only the reinforcing protrusion 44 .
Also, for example, a plurality of reinforcing recesses 43 may be formed at intervals in the up-down direction, and a plurality of reinforcing protrusions 44 may be formed at intervals in the front-rear direction of the seat.
Further, for example, the reinforcing recess 43 or the reinforcing protrusion 44 may be formed to extend long in the front-rear direction of the seat. In this case, it is preferable that a plurality of reinforcing recesses 43 or reinforcing protrusions 44 are formed at intervals in the seat width direction.

In the above embodiment, a vehicle seat for use in an automobile is described as a specific example, but the present invention is not limited thereto, and the vehicle seat can be used as a vehicle seat for trains, buses, etc., as well as airplanes, ships, etc.

In this embodiment, the vehicle seat according to the present invention has been mainly described.
However, the above embodiment is merely an example for facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof.

Description of the Preferred Embodiment S Vehicle seat 1 Seat back 1a, 2a Cushion material 1b, 2b Cover material 2 Seat cushion 3 Rail device 3a Lower rail 3b Upper rail 3c Rail operation lever 4 Height link device 4a First link 4b Second link 4c Height operation lever 5 Reclining device 5a Reclining body 5b Rotation shaft 5c Spiral spring 5d Reclining operation lever 10 Back frame 11 Back side frame 12 Upper frame 13 Lower frame 20, 120 Cushion frame 21, 121 Side frame 21a, 121a Frame body portion 21b, 121b Upper end flange portion 21c, 121c Lower end flange portion 21d, 121d Cover hook stop portion 121e, 121f Reinforcement portion 22 Pan frame 22a, 22b, 22c Bending portion 23 Elastic spring 30 Front connecting frame (connecting frame)
31 Frame main body portion 31a Opposing wall portion 31b Connecting wall portion 32 Flange portion 40, 140, 240, 340 Rear connecting frame (connecting frame)
41, 141, 241, 341 Frame main body portion 41a, 141a, 241a, 341a First opposing wall portion 41b, 141b, 241b, 341b Second opposing wall portion 41c, 141c, 341c Connecting wall portion 341d First protruding wall portion 341e Second protruding wall portion 42, 142, 242, 342 Flange portion 42a, 142a, 242a, 342a First flange portion 42b, 142b, 242b, 342b Second flange portion 42c, 142c, 342c Third flange portion 342d Fourth flange 342e Fifth flange 43 Reinforcing recess (reinforcing portion)
44 Reinforcing protrusion (reinforcing portion)
45 Weld marks

Claims (9)

A vehicle seat including a cushion frame that serves as a framework for a seat cushion,
The cushion frame is
Side frames are disposed on the left and right sides in the seat width direction and extend in the seat front-rear direction;
a connecting frame connecting front portions or rear portions of the left and right side frames,
The connecting frame has an open cross-sectional shape with an opening formed on one side in the up-down direction or one side in the seat front-rear direction, and extends toward an inner surface of the side frame,
The connecting frame is
A frame main body portion that extends longitudinally in the seat width direction and has the open cross-sectional shape;
a flange portion provided at an extending end portion of the frame body portion and formed so as to protrude outward from the extending end portion,
The frame main body and the flange are provided integrally, not separately,
The flange portion is formed along an inner surface of the side frame and abuts against the inner surface of the side frame,
The connecting frame is
It is formed from a plate-shaped frame,
A pair of opposing walls provided at a predetermined interval;
A connecting wall portion connecting the pair of opposing walls;
a reinforcing recess formed as a recess on an outer surface of the connecting frame and extending along an extension direction of the connecting frame . a height link device that connects the cushion frame to a vehicle body floor so that the cushion frame can be raised and lowered;
The height link device has left and right links provided between the cushion frame and the vehicle body floor,
The frame main body portion connects the left and right links so as to penetrate therethrough ,
2. The vehicle seat according to claim 1 , wherein the flange portion is formed so as to bend and protrude from the extended end portion of the frame main body portion at a position outside the left and right links in the seat width direction . The pair of opposing walls are provided at a predetermined interval in the seat front-rear direction,
The connecting wall portion connects upper ends of the pair of opposing walls,
the connecting frame has an open cross-sectional shape in which the opening is formed on a lower side of the connecting frame ,
3. The vehicle seat according to claim 1 , wherein a plurality of the reinforcing recesses are formed at intervals in the seat width direction . 4. The vehicle seat according to claim 1, wherein the reinforcing recess is disposed apart from the flange in the seat width direction. 5. The vehicle seat according to claim 1, wherein the flange portion and the side frame are welded in abutting contact with each other, so that a weld mark is formed on the flange portion . The flange portion is
a first flange portion and a second flange portion formed so as to protrude in opposite directions from the extending ends of the pair of opposing wall portions;
a third flange portion formed so as to protrude outward from the extending end portion of the connecting wall portion ,
6. The vehicle seat according to claim 1 , wherein the reinforcing recess is disposed apart from the flange in the seat width direction . The seat cushion is configured by placing a cushion material on the cushion frame and covering it with a cover material,
the side frame has a plurality of skin hooking portions formed on a side surface of the side frame for hooking an end portion of the skin material,
The vehicle seat according to any one of claims 1 to 6, characterized in that the connecting frame is disposed at a position between the plurality of upholstery hook retaining portions on the side surface of the side frame and is attached in contact with a flat portion of the side frame. The connecting frame connects front portions of the left and right side frames,
The cushion frame further includes a plate-shaped pan frame connecting front end portions of the left and right side frames, a rear connecting frame connecting rear portions of the left and right side frames, and a plurality of elastic springs hooked to the pan frame and the rear connecting frame and extending in the front-rear direction of the seat.
The connecting frame is
The upper surface of the connecting frame is formed to be flat,
The pan frame is disposed at a rear position and at a lower position than the plurality of elastic springs ,
8. The vehicle seat according to claim 1 , wherein the elastic spring is attached to the connecting wall of the rear connecting frame via a hook member . The connecting frame connects front portions of the left and right side frames,
The cushion frame includes a plate-shaped pan frame that connects front end portions of the left and right side frames,
The vehicle seat according to any one of claims 1 to 8, characterized in that a folded portion is formed in a front end portion of the pan frame by folding a tip of the front end portion.