JP7244733B2 - Reinforcement structure for vehicle seat - Google Patents

Description

The present invention relates to a reinforcing structure for a vehicle seat.

Conventionally, in order to realize a variety of seat arrangements, there are cases in which vehicle seats can be moved not only in the longitudinal direction but also in the width direction by adopting slide rails. When a load is applied, separation may occur between the movable rail and the fixed rail in the horizontal slide rail.
Therefore, as in Patent Document 1, a first peel-preventing member fixed to a connecting member connected to a seat cushion frame and a second peel-preventing member fixed to a foot bracket that supports a lateral slide rail are engaged. In addition, there is known a technique for preventing separation between a fixed rail and a movable rail in a horizontal slide rail.

JP 2013-112041 A

By the way, in adopting the technique of engaging the first peel-preventing member and the second peel-preventing member, the fixing strength of the first peel-preventing member and the fixing strength of the second peel-preventing member are further improved, and the horizontal slide rail There is a demand for a reinforcing structure that can more reliably prevent separation between the fixed rail and the movable rail in the .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reinforcing structure for a vehicle seat that can more reliably prevent separation between a fixed rail and a movable rail in a lateral slide rail.

In order to solve the above problems, the invention according to claim 1 provides a cushion frame that forms the skeleton of a seat cushion that supports the thighs and buttocks of a person, and a seat support that supports the cushion frame on the floor of a vehicle. and a separation prevention structure provided between the cushion frame and the seat support, the reinforcement structure for a vehicle seat comprising:
The seat support portion
a pair of left and right front and rear slide rails installed on the floor of the vehicle and comprising a fixed rail and a movable rail for sliding the cushion frame in the front and rear direction of the vehicle;
a front-rear horizontal slide rail provided on the lower surface of the cushion frame and having a fixed rail and a movable rail for sliding the cushion frame in the left-right direction;
a plurality of foot brackets provided on the left and right sides of each of the front and rear lateral slide rails, and having lower ends thereof attached to the pair of left and right front and rear slide rails to support the cushion frame;
a connection member that connects the plurality of foot brackets, which are arranged at intervals in the front-rear direction on at least one of the left side of the seat and the right side of the seat, and
The detachment prevention structure is
an upper separation preventing portion fixed to the cushion frame;
a lower peeling preventing portion fixed to a rear side foot bracket of the front and rear foot brackets connected by the connecting member of the seat support portion,
the upper peel-preventing portion and the lower peel-preventing portion are engaged with each other so that the cushion frame can be slidably moved by the front and rear lateral slide rails;
The upper peeling prevention portion is fixed to a back pipe frame provided at the rear end portion of the cushion frame,
A mounting portion to which the child seat is mounted is welded to the back pipe frame,
The upper peel-preventing portion is arranged rearward of the attached portion and at substantially the same position in the left-right direction .

According to a second aspect of the invention, there is provided the vehicle seat reinforcing structure according to the first aspect, wherein the lower peeling preventing portion is fixed to a position of the rear foot bracket so as to sandwich the connecting member. It is characterized by

The invention according to claim 3 is the vehicle seat reinforcing structure according to claim 1 or 2 , wherein the upper peeling prevention part comprises a fixed part fixed to the back pipe frame and a left-right direction of the fixed part. and a flange shape formed below the positions of both ends.

The invention according to claim 4 is the vehicle seat reinforcing structure according to claim 3 , wherein the fixing portion has a recess recessed toward the back pipe frame at the center in the left-right direction of the fixing portion. characterized by being formed

The invention according to claim 5 is the vehicle seat reinforcing structure according to claim 4 , wherein the upper peeling prevention part is positioned at the center recess of the fixing part and at both left and right ends of the fixing part. and is welded to the back pipe frame.

The invention according to claim 6 is the vehicle seat reinforcing structure according to any one of claims 3 to 5, wherein the welded portion of the attached portion to the back pipe frame and the upper separation preventing portion are welded to the back pipe frame. It is characterized in that the welded portions at the positions of the left-right direction side end portions of the fixing portion are arranged at substantially the same positions in the left-right direction.

According to a seventh aspect of the present invention , in the vehicle seat reinforcing structure according to the sixth aspect, a portion of the upper peeling prevention portion that engages with the lower peeling prevention portion is positioned closer to the fixing portion than the fixing portion. It is characterized by being long and wide in the left-right direction.

The invention according to claim 8 is the vehicle seat reinforcing structure according to any one of claims 1 to 7 , wherein the upper peel-preventing part extends vertically on the surface of the upper peel-preventing part. characterized by comprising a bead formed by
A ninth aspect of the invention provides a cushion frame that forms a skeleton of a seat cushion that supports a person's thighs and buttocks, and a seat back skeleton that has a lower end supported by the seat cushion and serves as a backrest. a seat back frame to be formed; a seat support for supporting the cushion frame on a floor of a vehicle; an anti-separation structure provided between the cushion frame and the seat support; A reinforcing structure for a vehicle seat, comprising: a cushion pad provided in the
The seat support portion
a pair of left and right front and rear slide rails installed on the floor of the vehicle and comprising a fixed rail and a movable rail for sliding the cushion frame in the front and rear direction of the vehicle;
a front-rear horizontal slide rail provided on the lower surface of the cushion frame and having a fixed rail and a movable rail for sliding the cushion frame in the left-right direction;
a plurality of foot brackets provided on the left and right sides of each of the front and rear lateral slide rails, and having lower ends thereof attached to the pair of left and right front and rear slide rails to support the cushion frame;
a connection member that connects the plurality of foot brackets, which are arranged at intervals in the front-rear direction on at least one of the left side of the seat and the right side of the seat, and
The detachment prevention structure is
an upper separation preventing portion fixed to the cushion frame;
a lower peeling preventing portion fixed to a rear side foot bracket of the front and rear foot brackets connected by the connecting member of the seat support portion,
the upper peel-preventing portion and the lower peel-preventing portion are engaged with each other so that the cushion frame can be slidably moved by the front and rear lateral slide rails;
The upper peeling prevention portion is fixed to a back pipe frame provided at the rear end portion of the cushion frame,
A mounting portion to which the child seat is mounted is welded to the back pipe frame,
The upper peel-preventing portion is arranged rearward of the attached portion and at substantially the same position in the left-right direction.

According to the inventions of claims 1 and 9 , the foot bracket to which the lower peeling prevention part is fixed is connected to the front foot bracket by the connection member. The fixed state of the lower detachment preventing portion is stronger than when it is not connected. On top of that, the upper anti-peeling part fixed to the cushion frame side and the lower anti-peeling part fixed to the rear foot bracket of the front and rear foot brackets connected by the connecting member are connected to the front and rear horizontal slide rails. Since the cushion frames are engaged with each other in a state in which the cushion frames can be slidably moved, separation between the fixed rail and the movable rail in the horizontal slide rail can be more easily prevented.
In addition, since the upper peeling prevention portion is fixed to the back pipe frame provided at the rear end portion of the cushion frame, the upper peeling prevention portion is more difficult than the case where the upper peeling prevention portion is fixed to the horizontal slide rail, for example. It is easy to strengthen the fixing strength of the
In addition, since the upper detachment preventing portion is arranged behind the attachment portion to which the child seat is attached and at substantially the same position in the left-right direction, the upper detachment prevention portion and the attachment portion are arranged in the back pipe frame. Rigidity in the vicinity of the provision can be improved. As a result, the attachment state of the child seat attached to the attached portion can be improved.

According to the second aspect of the invention, since the lower peeling preventing portion is fixed at a position where the connecting member is sandwiched in the rear foot bracket, the fixed portion of the lower peeling preventing portion and the connecting member are fixed. can be brought close to each other, and the fixed state of the lower peeling prevention portion can be easily strengthened.

According to the third aspect of the invention, the upper peeling prevention portion has a fixing portion fixed to the back pipe frame, and a flange shape formed below the position of both left and right ends of the fixing portion. Therefore, it is possible to improve the rigidity of the portion below the fixing portion. As a result, the upper peel-preventing portion is less likely to deform, so that the engagement between the upper peel-preventing portion and the lower peel-preventing portion is less likely to be disengaged.
Furthermore, for example, when the seat belt is pulled and the upper peeling prevention portion is about to be displaced in an oblique forward direction, the flange-shaped portion is brought into contact with the lower peeling prevention portion and its surroundings to suppress the amount of displacement. can be done.

According to the fourth aspect of the present invention, the fixing portion is formed with a concave portion recessed toward the back pipe frame at the center of the fixing portion in the left-right direction. can be used, and the rigidity can be improved.

According to the fifth aspect of the invention, the upper peeling prevention portion is welded to the back pipe frame at the center recess of the fixing portion and at both lateral ends of the fixing portion. Since it is welded, the fixing strength to the back pipe frame can be improved.

According to the sixth aspect of the invention, the welding points of the attached portion to the back pipe frame and the welding points at the left and right ends of the fixing portion of the upper peeling prevention portion are substantially equal in the left and right direction. Therefore, it is possible to improve the rigidity of the vicinity of the back pipe frame where the upper peeling prevention portion and the attached portion are welded together, and to improve the fixing strength of the upper peeling prevention portion.

According to the seventh aspect of the invention, the portion of the upper peeling prevention portion that engages with the lower peeling prevention portion is formed to be longer and wider in the left-right direction than the fixed portion, so that the horizontal slide rail can be used to move the portion of the upper peeling prevention portion. Even when the cushion frame is slid to the left and right, the engagement between the upper peeling prevention portion and the lower peeling prevention portion is less likely to be disengaged.

According to the eighth aspect of the invention, since the upper peeling prevention portion includes a bead formed on the surface of the upper peeling prevention portion so as to extend in the vertical direction, the rigidity of the upper peeling prevention portion can be improved. can. As a result, the upper peel-preventing portion is less likely to deform, so that the engagement between the upper peel-preventing portion and the lower peel-preventing portion is less likely to be disengaged.

1 is a front perspective view showing a seat frame that constitutes a vehicle seat; FIG. Fig. 2 is a rear perspective view showing a seat frame that constitutes the vehicle seat; It is a perspective view showing the vicinity of the reclining mechanism. It is a perspective view showing the vicinity of the front end portion side of the cushion frame. It is a left side view showing the vicinity of the reclining mechanism. FIG. 4 is a cross-sectional view seen from the front side showing the vicinity of an anchor point of the cushion side frame having a closed cross-sectional structure; It is a perspective view showing the vicinity of the reclining mechanism in the left cushion side frame. FIG. 4 is a perspective view showing an example in which left and right cushion side frames have a closed cross-sectional structure; It is a perspective view showing the vicinity of the lower end of the left back side frame and the reclining mechanism. It is sectional drawing at the time of seeing the lower end part of the back side frame of the left side from a front side. FIG. 4 is a cross-sectional view of the lower end portion of the left back side frame as viewed from above; (a) is a front view showing the lower end of the left back side frame and the vicinity of the reclining mechanism, and (b) is a rear view. It is a perspective view showing a second bracket. (a) is a front view showing a second bracket, (b) is a rear view, and (c) is a plan view. It is a rear view which shows the vicinity of a peeling prevention structure. It is a left view which shows the vicinity of a peeling prevention structure. It is a rear perspective view which shows the vicinity of a peeling prevention structure. FIG. 11 is a rear view showing an example of connecting front and rear foot brackets with a plurality of connecting members; It is a right side view showing a seat frame provided with an armrest. Fig. 10 is a right side view showing the seat frame provided with armrests, with the seat back frame reclined. Fig. 10 is a right side view showing the seat frame with the armrests retracted; It is a perspective view when the armrest provided on the right side is seen from the left side. It is an exploded perspective view of an armrest. FIG. 11 is a perspective view showing a modification of the seat back frame in which left and right back side frames have a closed cross section structure; FIG. 11 is a perspective view showing a modification of the seat back frame provided with a reinforcing frame; FIG. 11 is a perspective view showing a modification of the seat back frame provided with a plate-shaped back frame and a connecting frame; FIG. 11 is a perspective view showing a modified example near the front end portion of the cushion frame;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below have various technically preferable limitations for carrying out the present invention, but the technical scope of the present invention is not limited to the following embodiments and illustrated examples. do not have.
In the following description, the portion joined by welding is referred to as a welded portion W. As shown in FIG. Each drawing will be described with reference to W.

<First Embodiment>
1 and 2, reference numeral 1 denotes a seat frame of a vehicle seat on which a person sits. This seat frame 1 comprises a cushion frame 2 forming a skeleton of a seat cushion that supports the thighs and buttocks of a person, and a seat that forms a skeleton of a seat back whose lower end is supported by the seat cushion and serves as a backrest. A back frame 3, a reclining mechanism 4 for tilting the seat back frame 3 with respect to the cushion frame 2, a seat support portion 5 for supporting the vehicle seat on the floor, and separation of the cushion frame 2 from the seat support portion 5. and an anti-peeling structure 6 for preventing the peeling.
The vehicle seat in this embodiment is a passenger car seat. However, the seat is not limited to this, and may be a seat in another automobile such as a bus or truck, or a seat in a vehicle other than an automobile such as a train, ship, or aircraft.

Although not shown, the seat frame 1 includes a cushion frame 2 and a seat back frame 3 provided with cushion pads, and the cushion pads are covered with an outer skin to constitute a vehicle seat.
Although not shown, the seat frame 1 is installed on the floor of the vehicle body via a pair of left and right front and rear slide rails for sliding the seat frame 1 in the front and rear direction of the vehicle body (position adjustment).

[About the cushion frame]
As shown in FIGS. 1 to 7, the cushion frame 2 connects left and right cushion side frames 20 and 21 spaced apart from each other and rear end portions of the left and right cushion side frames 20 and 21. It has a back pipe frame 22 and a front pipe frame 23 connecting the front ends of the left and right cushion side frames 20 and 21 .

5 and 6, one of the left and right cushion side frames 20 and 21 (the left side in this embodiment), the cushion side frame 20, has a closed cross section formed by connecting a left divided body 20a and a right divided body 20b, as shown in FIGS. It is integrally formed as a hollow body with a structure (also called monaka structure).

The left split body 20a is formed to have a U-shaped cross-section opening toward the inside (right side). That is, it consists of a web 200 and flanges 201 and 202 integrally formed above and below the web 200 .
A tip portion of the upper flange 201 is a bent portion 201a that is bent downward.
A reinforcing concave portion 200a is formed in the central portion of the web 200 in the longitudinal direction and bulges inward and is concave when viewed from the outer side surface (left side surface). As shown in FIG. 5, the reinforcing recess 200a is arranged in the vicinity of an anchor point 24 (described later) of a seat belt (not shown).

The right divided body 20b is formed to have a U-shaped cross section opening outward (to the left). That is, it consists of a web 203 and flanges 204 and 205 integrally formed above and below the web 203 .

The web 200 on the left split body 20a and the web 203 on the right split body 20b face each other and are separated from each other.
The upper flange 201 of the left split body 20a and the upper flange 204 of the right split body 20b overlap each other such that the upper flange 204 of the right split body 20b faces upward. Since the bent portion 201a is bent downward as described above, it is separated from the upper flange 204 of the right divided body 20b.
The lower flange 202 of the left split body 20a and the lower flange 205 of the right split body 20b overlap each other such that the lower flange 205 of the right split body 20b faces upward.

The upper and lower flanges 201, 202 of the left split body 20a and the upper and lower flanges 204, 205 of the right split body 20b, which overlap each other, are joined by welding at a plurality of points (that is, welded portions W).
When the upper flange 201 of the left split body 20a and the upper flange 204 of the right split body 20b are joined by welding, the welding material (base material) flows into the gap between the overlapping flanges 201 and 204. may occur. In such a case, the welding material that has flowed can be received in the gap between the flange 204 and the bent portion 201a that are spaced apart from each other.

A front end portion of the left cushion side frame 20 is opened forward so that a left end portion 23a of a front pipe frame 23, which will be described later, can be inserted thereinto.
Further, the rear end portion of the left cushion side frame 20 is opened upward so that the lower portion of the first bracket 41, which will be described later, can be inserted.

As shown in FIG. 5, an anchor point 24 (fixing point) for a seat belt (not shown) is provided at a position near the rear of the lengthwise central portion of the left cushion side frame 20 . The seat belt is a so-called three-point seat belt, and the anchor point 24 is a portion to which the lower end of the seat belt is fixed.
More specifically, the anchor point 24 is a location for fastening a holder that holds the lower end of the seat belt (not shown). The retainers are adapted to be fastened to anchor points 24 by fasteners such as bolts. Therefore, as shown in FIG. 6, the anchor point 24 is a through hole that penetrates the left cushion side frame 20 in the left-right direction. That is, the anchor point 24, which is a through hole, is formed so as to pass through the left split body 20a, the right split body 20b, and a first bracket 41, which will be described later. A bolt for fastening the retainer is passed through an anchor point 24, which is a through hole, and a nut (not shown) is provided at the tip. This nut may be provided inside the cushion side frame 20 at a location corresponding to the anchor point 24 .

Of the left and right cushion side frames 20 and 21, the other (right side in this embodiment) cushion side frame 21 is formed in a U-shaped cross-section opening toward the inside (left side). That is, it consists of a web 210 and flanges 211 and 212 integrally formed above and below the web 210 . In this embodiment, the right cushion side frame 21 has a U-shaped cross section, but as shown in FIG. , denoted by reference numeral 21A in FIG. 8). By making the left and right cushion side frames 20 and 21A to have a closed cross-section structure, the rigidity of the cushion frame 2 can be made higher than when only one side has a closed cross-section structure.
A reinforcing plate 21a having a U-shaped cross section is integrally attached to the rear side of the other cushion side frame 21 by welding or the like along the inner surface of the U-shaped cross section. As a result, a sufficient plate thickness can be secured in the rear portion of the cushion side frame 21, so that the rigidity of the rear portion of the cushion side frame 21 to which a load is likely to be applied can be improved.
Although not shown, the right cushion side frame 21 is provided with a buckle to which a tongue of a three-point seat belt is attached. At the fixed position of the buckle, as shown in FIG. 3, a nut 25 into which a fixing bolt is screwed is provided.

The back pipe frame 22 connects the rear ends of the left and right cushion side frames 20, 21, as shown in FIGS.
Both ends of the back pipe frame 22 are provided so as to pass through the left and right cushion side frames 20 and 21, respectively, and are joined by welding (welded portions W).

On the back pipe frame 22, as shown in FIGS. 1 to 3 and 7, an ISOFIX type child seat (not shown) corresponding to ISOFIX, which is an international standard for a child seat mounting method, is mounted. Mounting portions (also referred to as lower anchorages) 22a and 22b are provided.

The mounting part 22a located on the left side is generally formed in a substantially U shape or a substantially tortoiseshell bracket shape, the rear surface thereof is curved along the outer peripheral surface of the back pipe frame 22, and the bottom portion is curved. , are fixed by bolts 510 to a movable rail 50b of a lateral slide rail 50, which will be described later. A substantially U-shaped wire 220 is provided on the upper surface portion positioned above the back pipe frame 22 so as to protrude forward. In addition, flanges are formed on the bottom and top surfaces to improve rigidity.
7, 15, etc., the right and left ends of the rear surface of the mounted portion 22a and the left and right ends of the upper end are welded to the back pipe frame 22, and the left end of the rear surface is It is joined by welding to the right side surface (that is, the right divided body 20b) of the left cushion side frame 20 (welded portion W). In other words, the mounted portion 22 a connects the left cushion side frame 20 , the back pipe frame 22 , and the movable rail 50 b of the horizontal slide rail 50 .
As shown in FIGS. 1 to 3, the mounting portion 22b located on the right side is formed as a bracket consisting of an upper surface portion and left and right flange portions, and a wire 221 is provided integrally with the upper surface portion. ing. This wire 221 is bent into a substantially U shape and protrudes forward. The projecting direction and projecting length thereof are set to be the same as those of the wire 220 in the mounting portion 22a located on the left side.
Left and right connectors provided at the rear of the child seat are hooked to the wires 220 and 221 of the left and right mounting portions 22a and 22b.

As shown in FIGS. 1 and 4, the front pipe frame 23 is bent into a substantially U shape, and its left end 23a is joined to the front end of the left cushion side frame 20. As shown in FIG. Also, the right end portion 23b is joined to the front end portion of the right cushion side frame 21 .
More specifically, the left end 23a of the front pipe frame 23 is welded to the web 200 and the upper and lower flanges 201, 202 of the left split body 20a of the left cushion side frame 20, respectively. The right end 23b of the front pipe frame 23 is welded to the web 210 and the upper and lower flanges 211, 212 of the right cushion side frame 21, respectively.
The front pipe frame 23 is bent upward from the left and right ends 23a and 23b toward the front.

[About the seat back frame]
Next, as shown in FIGS. 1, 9 to 14, etc., the seat back frame 3 includes left and right back side frames 30 and 31 spaced apart from each other, and left and right back side frames 30 and 31. It has an upper pipe frame 32 (U-shaped back frame) that connects the upper ends, and a lower pipe frame 33 (back frame) that connects the lower ends of the left and right back side frames 30 and 31. .

One of the left and right back side frames 30 and 31 (the left side in this embodiment), the back side frame 30, has a closed cross-section formed by connecting a left split body 30a and a right split body 30b, as shown in FIGS. It is integrally formed as a hollow body with a structure (also called monaka structure).

The left divided body 30a is formed to have a U-shaped cross-section opening toward the inside (right side). That is, it consists of a web 300 and flanges 301 and 302 integrally formed on the front and rear sides of the web 300 .
The tip of the front flange 301 is a bent portion 301a that is bent rearward.

As shown in FIGS. 1, 9 and 11, the web 300 has a recess 300a and bulges 300b and 300c.
The recessed portion 300a is formed so as to bulge inward from the lower end portion of the web 300 to the vicinity of the upper end portion thereof and to be recessed when viewed from the outer side surface (left side surface).
Along with the formation of the recess 300a, bulging portions 300b and 300c are formed on the front and rear edges of the web 300 so as to bulge outward (to the left) with respect to the recess 300a. ing.
The front bulging portion 300 b is formed integrally with the front flange 301 , and the rear bulging portion 300 c is formed integrally with the rear flange 302 .

The right split body 30b is formed to have a U-shaped cross-section opening outward (to the left). That is, it consists of a web 303 and flanges 304 and 305 integrally formed on the front and rear sides of the web 303 .
The web 303 has, as shown in FIGS. 1, 9 and 11, a concave portion 303a and bulging portions 303b and 303c.
The recessed portion 303a is formed so as to bulge inward from the vicinity of the lower end portion to the vicinity of the upper end portion of the web 303 and be recessed when viewed from the outer side surface (right side surface).
Along with the formation of the concave portion 303a, bulging portions 303b and 303c are formed on the front and rear edges of the web 303 so as to bulge outward (to the right) with respect to the concave portion 303a. It is
The front bulging portion 303 b is integrally formed with the front flange 304 , and the rear bulging portion 303 c is integrally formed with the rear flange 305 .

The web 300 on the left split body 30a and the web 303 on the right split body 30b face each other and are separated from each other.
The front flange 301 of the left split body 30a and the front flange 304 of the right split body 30b overlap each other such that the front flange 304 of the right split body 30b is on the front side. Since the bent portion 301a is bent rearward as described above, the bent portion 301a is separated from the front flange 304 of the right divided body 30b. The bent portion 301a is bent along the surface of the front flange 42a of the second bracket 42, which will be described later (see FIG. 11).
The rear flange 302 of the left split body 30a and the rear flange 305 of the right split body 30b overlap each other such that the rear flange 305 of the right split body 30b is on the rear side.

The front and rear flanges 301, 302 of the left split body 30a and the front and rear flanges 304, 305 of the right split body 30b, which overlap each other, are joined by welding at a plurality of points (welded portions W).
When the front flange 301 of the left split body 30a and the front flange 304 of the right split body 30b are joined by welding, the welding material (base material) flows into the gap between the overlapping flanges 301 and 304. may occur. In such a case, the welding material that has flowed can be received in the gap between the flange 304 and the bent portion 301a that are spaced apart from each other.

A lower end portion of the left back side frame 30 is opened downward so that an upper portion of a second bracket 42 to be described later can be inserted.
The left back side frame 30 is formed so as to gradually thicken downward in a side view. Therefore, the opening at the lower end portion is formed wider than the inner hollow portion, so that the upper portion of the second bracket 42 can be easily inserted.

Of the left and right back side frames 30 and 31, the other (right side in this embodiment) back side frame 31 is formed to have a U-shaped cross section opening toward the inside (left side). That is, it consists of a web 310 and flanges 311 and 312 integrally formed on the front and rear sides of the web 310 .
The right backside frame 31 is formed shorter than the left backside frame 30 . Furthermore, the lower end of the right backside frame 31 and the lower end of the left backside frame 30 are arranged at the same height position. That is, the upper end portion of the left back side frame 30 projects upward from the upper end portion of the right back side frame 31 . A guide bracket 34 used for guiding a seat belt (not shown) is provided at the upper end of the left back side frame 30 . That is, the guide bracket 34 is positioned on the upper end side of the three-point seat belt.
The upper end portion of the right back side frame 31 is formed narrower than the central portion and the lower end portion, so that an intermediate pipe 32b of an upper pipe frame 32, which will be described later, can be sandwiched therebetween.
The guide bracket 34 is used as a set with a front side portion 34 a covering the front surface of the upper end portion of the left back side frame 30 .

The upper pipe frame 32 connects the upper ends of the left and right back side frames 30 and 31, as shown in FIGS.
The upper pipe frame 32 is bent into a substantially U-shape, and includes an upper pipe 32a extending in the horizontal direction, an intermediate pipe 32b extending in the vertical direction, and a lower pipe 32c extending in the horizontal direction. A bent portion is provided between the upper pipe 32a and the intermediate pipe 32b and between the intermediate pipe 32b and the lower pipe 32c.
Square pipes 32d, 32d to which pillar holders for holding pillars of the headrest are attached are joined to the upper pipe 32a (not shown).
Left end portions of the upper pipe 32a and the lower pipe 32c are welded to the left back side frame 30 (welded portion W). Left end portions of the upper pipe 32a and the lower pipe 32c are provided so as to pass through the web 300 of the left divided body 30a that constitutes the left back side frame 31. As shown in FIG. The left end portion of the upper pipe 32a passing through the web 300 is covered with one piece of the guide bracket 34. As shown in FIG. Further, the left end portion of the lower pipe 32c passing through the web 300 does not protrude outward (to the left) beyond the bulging portions 300b and 300c formed on the front and rear sides of the web 300. As shown in FIG.
The intermediate pipe 32b is provided inside the web 310 and the front and rear flanges 311 and 312 at the upper end of the right back side frame 31, and is in a state of being sandwiched between the web 310 and the front and rear flanges. It is joined by welding to 311 and 312 (welded portion W).

The lower pipe frame 33 is a single pipe frame extending in the horizontal direction, and connects the lower ends (slightly above the lower ends) of the left and right backside frames 30 and 31 . Both longitudinal ends of the lower pipe frame 33 are provided so as to pass through the left and right back side frames 30 and 31, respectively, and are joined by welding (welded portions W).
The left end portion of the lower pipe frame 33 penetrates the web 300 of the left divided body 30a that constitutes the left back side frame 30, but is located outside the bulging portions 300b and 300c formed on the front and rear sides of the web 300. (Left side) It is in a state where it does not protrude. That is, the left end portion of the lower pipe frame 33 penetrates the recess 300a in the web 300 of the left split body 30a.

[About the reclining mechanism]
Next, as shown in FIGS. 1 to 14, the reclining mechanism 4 includes a substantially disk-shaped round recliner 40 having a rotation stopping function and a first recliner for the left side of the seat connected via the round recliner 40. It has a bracket 41, a second bracket 42, and a third bracket 43 for the right side of the seat.

The round recliners 40 are provided on both left and right sides of the seat frame 1 , and on the left side of the seat, the round recliners 40 rotatably connect the second bracket 42 to the first bracket 41 . On the right side of the seat, the right back side frame 31 is rotatably connected to the third bracket 43 .
The reclining mechanism 4 is provided with a rotating shaft 4 a that passes through the center of the round recliner 40 and serves as the center of rotation of the seatback frame 3 . Further, the rotating shaft 4a is provided so as to pass through the first bracket 41 and the second bracket 42 .

The first bracket 41 is formed in a plate shape having a main body plate portion, and as shown in FIGS. It is in a fixed state. The round recliner 40 is welded to the inner side surface (right side surface) of the upper portion of the first bracket 41 (welded portion W).
Flanges 41a and 41b are integrally formed on the front edge and the rear edge of the first bracket 41, respectively, in order to improve the rigidity of the first bracket 41. As shown in FIG.
A vertical intermediate portion 41c of the body plate portion of the first bracket 41 is formed in a stepped shape so that the upper portion of the first bracket 41 is located outside the lower portion.

The lower part of the first bracket 41 is provided so as to be inserted from a portion opened upward on the rear end side of the cushion side frame 20 having a closed cross-section structure. The lower part of the first bracket 41 is fixed by bolts 410 and 411 at two front and rear positions from the outer surface of the cushion side frame 20 .
The bolts 410 and 411 pass through the cushion side frame 20 from side to side, and nuts 412 and 413 are tightened on the inner surface of the cushion side frame 20 as shown in FIG.
Note that the positions of the bolts 410 and 411 are set at one point in front of the back pipe frame 22 and one point behind the back pipe frame 22 .

As shown in FIG. 5, a projecting piece 41d projecting obliquely forward and downward is integrally formed in the lower part of the first bracket 41 below the fixing points by the bolts 410 and 411. As shown in FIG. The protruding piece 41d is a portion where the anchor point 24, which is a through hole, is formed. In other words, a through hole that serves as the anchor point 24 is formed in the projecting piece 41d.

The second bracket 42 is formed in a plate shape having a body plate portion, and as shown in FIGS. It is in a fixed state. The round recliner 40 is welded to the outer side surface (left side surface) of the lower portion of the second bracket 42 .
Flanges 42a and 42b are integrally formed on the front edge and the rear edge of the second bracket 42, respectively, in order to improve the rigidity of the second bracket 42. As shown in FIG.
A bent plate portion 42c bent into a crank shape is formed integrally with the upper end portion of the body plate portion of the second bracket 42 .
The bending plate portion 42c includes a first piece 420 that is integrally formed on the upper edge portion of the main body plate portion and protrudes upward, and a direction away from the upper end portion of the first piece 420 from the main body plate portion (left side in this embodiment). and a third piece 422 projecting upward from the tip of the second piece 421 in the projecting direction.

The upper portion of the second bracket 42 including the bending plate portion 42c is provided so as to be inserted from a downward opening portion of the lower end portion of the back side frame 30 having a closed cross-section structure.
A main body plate portion of the second bracket 42 is in contact with the web 303 of the right divided body 30b of the back side frame 30 and joined by welding. Further, the third piece 422 of the bending plate portion 42c is in contact with the web 300 of the left divided body 30a of the back side frame 30 and joined by welding (welded portion W).
Welding holes 300d and 303d passing through the webs 300 and 303 are formed in the web 300 of the left split body 30a and the web 303 of the right split body 30b at locations where the second bracket 42 abuts. , the body plate portion of the second bracket 42 and the third piece 422 are fixed by welding using the holes 300d and 303d. That is, the edge portions of the holes 300d and 303d, the body plate portion of the second bracket 42 and the third piece 422 are welded together. As a result, the body plate portion of the second bracket 42 and the third piece 422 can be welded from the outer surface side of the back side frame 30 having a closed cross section structure.
In this embodiment, the third piece 422 is in contact with the web 300 of the left split body 30a and is joined by welding, but it may be in a state of being in contact without being joined. .
The body plate portion of the second bracket 42 is welded to the right divided body 30b not only at the position of the hole 303d but also at a plurality of positions below the hole 303d.

More specifically, the second bracket 42 has its main body plate portion fixed in contact with the web 303 of the right split body 30b, and the third piece 422 of the bending plate portion 42c above the main body plate portion is attached to the left split body 30a. is fixed in contact with the web 300 of the. That is, the second bracket 42 is in a state of being fixed to the back side frame 30 at two points spaced apart in the diagonal direction inside the left back side frame 30 into which the second bracket 42 is inserted. More specifically, one fixing point (the point where the third piece 422 is fixed in the bending plate portion 42c: the position of the hole 300d) is located above and outside, and the other fixing point (The portion where the main body plate portion is fixed: the position of the hole 303d and other welded portions) are located below and inside.
Since the second bracket 42 is fixed inside the back side frame 30 at two points spaced apart in the upper and lower oblique directions as described above, it has a reinforcing effect against the load applied to the three-point seat belt that is hung on the robe. demonstrate.

The third bracket 43 has a main plate portion and is formed in a plate shape, and as shown in FIGS. It is fixed to the outer surface. The round recliner 40 is welded to the inner side surface (left side surface) of the upper portion of the third bracket 43 . Further, the round recliner 40 is welded to the outer surface (right side surface) of the lower end portion of the right back side frame 31 .
Flanges 43a and 43b are integrally formed on the front edge, lower edge, and rear edge of the third bracket 43 so as to improve the rigidity of the third bracket 43. (See FIG. 19, etc.).
Further, the lower end of the third bracket 43 is fixed to the right cushion side frame 21 by bolts 430 and 431 at two front and rear locations.
The bolts 430 and 431 pass through the third bracket 43 and the cushion side frame 21 from side to side, and nuts 432 and 433 are tightened on the inner surface of the cushion side frame 21 as shown in FIG.
Note that the positions of the bolts 430 and 431 are set at one point in front of the back pipe frame 22 and one point behind the back pipe frame 22 . That is, the positional relationship is exactly opposite to that of the bolts 410 and 411 provided on the left side.

[About the seat support part]
Next, as shown in FIGS. 1 to 4, 7, 15, and 16, the seat support portion 5 includes lateral slide rails 50 and 51 provided on the front and rear sides of the cushion frame 2, Foot brackets 52 and 53 provided at the left and right ends of the horizontal slide rail 50, foot brackets 54 and 55 provided at the left and right ends of the rear horizontal slide rail 51, and front and rear foot brackets provided on the left side. and a connection member 56 that connects the foot brackets 52 and 54 of each other.
Each of the foot brackets 52 to 55 has its lower end attached to the movable rail of the pair of left and right front and rear slide rails. That is, the seat support portion 5 in this embodiment can support the vehicle seat on the floor via the front and rear slide rails.

The lateral slide rails 50 and 51 are for sliding the seat frame 1 in the lateral direction, and are elongated in the lateral direction.
As shown in FIGS. 4 and 16, the horizontal slide rails 50 and 51 include fixed rails 50a and 51a, movable rails 50b and 51b slidably provided in the longitudinal direction with respect to the fixed rails 50a and 51a, , so that the position of the seat frame 1 can be adjusted in the left-right direction.

A fixed rail 50a of the horizontal slide rail 50 provided on the front side is provided to bridge between the upper end portions of the foot brackets 52 and 53 positioned on the front side.
The movable rail 50b of the horizontal slide rail 50 provided on the front side is provided to span the lower surfaces of the left and right cushion side frames 20, 21 in the vicinity of the left and right side ends 23a, 23b of the front pipe frame 23 of the cushion frame 2. It is
More specifically, as shown in FIG. 4, the inner surface of the front end portion of the left cushion side frame 20 (that is, the right divided body 20b) protrudes inward along the extending direction of the horizontal slide rail 50. A connection member 206 is integrally provided by welding or the like, and the movable rail 50b is fixed to this connection member 206. As shown in FIG. That is, the left end portion of the movable rail 50b is provided on the lower surface of the left cushion side frame 20 via the connecting member 206. As shown in FIG.
The right end of the movable rail 50b is fixed to the lower flange 212 at the front end of the right cushion side frame 21. As shown in FIG.
The movable rail 50b is fixed to the lateral slide rail 50 by bolts 500, 501 and nuts 502, 503. As shown in FIG.

The bolt 500 that connects the movable rail 50b and the connecting member 206 is positioned forward of the end portion of the left end portion 23a of the front pipe frame 23 in the cushion frame 2, although not shown.
4, the bolt 501 connecting the movable rail 50b and the lower flange 212 at the front end of the right cushion side frame 21 is located at the end of the right end 23b of the front pipe frame 23 of the cushion frame 2, as shown in FIG. located in front of the part.
In other words, the left and right ends 23a and 23b of the front pipe frame 23 extend rearward from the point where the movable rail 50b is fixed to the cushion side frames 20 and 21. As shown in FIG.

A fixed rail 51a of the horizontal slide rail 51 provided on the rear side is provided so as to bridge between the upper end portions of the foot brackets 54 and 55 positioned on the rear side.
The movable rail 51b of the lateral slide rail 51 provided on the rear side is provided in the vicinity of the left and right ends of the back pipe frame 22 of the cushion frame 2 so as to span the lower surfaces of the left and right cushion side frames 20 and 21. ing.
More specifically, the mounting portion 22a described above is integrally provided on the inner surface of the rear end portion of the left cushion side frame 20 (that is, the right divided body 20b), and the movable rail 51b It is fixed by a bolt 510 and a nut 512 to the bottom of the mounting part 22a. That is, since the mounting portion 22a is welded to the left cushion side frame 20 and the back pipe frame 22 as described above, the left end portion of the movable rail 51b also extends to the left side of the mounting portion 22a. The cushion side frame 20 and the back pipe frame 22 are connected to each other.
The right end of the movable rail 51b is fixed to the lower flange 212 at the rear end of the right cushion side frame 21. As shown in FIG. A bolt 511 and a nut 513 are used to fix the right end of the movable rail 51b.

Each of the foot brackets 52 to 55 is formed in a substantially box shape by a plate portion facing front and rear, a plate portion facing left and right, and a plate portion forming an upper surface. Each plate part is joined by welding. The shapes of the foot brackets 52 to 55 are appropriately changed according to the front and rear slide rails (not shown) and the floor of the vehicle body.
The fixed rails 50a and 51a of the lateral slide rails 50 and 51 are bolted or welded to plate portions forming upper surfaces of the foot brackets 52-55.

The connecting member 56 is a pipe frame that connects the front and rear foot brackets 52 and 54 provided on the left side. The connecting member 56 is provided so as to pass through the front and rear plate portions of the foot bracket 52 located on the front side and the front and rear plate portions of the foot bracket 54 located on the rear side. That is, the front end portion of the connecting member 56 projects forward from the front plate portion of the foot bracket 52 located on the front side, and the rear end portion projects rearward from the rear plate portion of the foot bracket 54 located on the rear side. ing. The connecting member 56 is welded to the plate portions of the front and rear foot brackets 52 and 54 (welded portions W).
As a result, not only is the integrity of the left side portion of the seat support portion 5 enhanced, but the reinforcement effect in a wide range including the left side portion of the cushion frame 2 fixed to the seat support portion 5 is enhanced.

[About peel prevention structure]
Next, the detachment prevention structure 6 prevents detachment of the cushion frame 2 from the seat support portion 5, and is provided on the rear left side of the seat frame 1 as shown in FIGS. there is
Such a separation prevention structure 6 includes a back pipe frame 22 in the cushion frame 2, a left front foot bracket 52 and a left rear foot bracket 54 in the seat support portion 5, and front and rear foot brackets 52 on the left side of the seat. , 54, an upper anti-peeling portion 60 fixed to the rear surface of the back pipe frame 22, and a lower anti-peeling portion 60 fixed to the rear surface of the foot bracket 54 and engaged with the upper anti-peeling portion 60. a portion 61; In this embodiment, the front foot bracket 52 and the rear foot bracket 54 are connected together by a single connecting member 56. However, as shown in FIG. The brackets 52, 54 may be connected. As a result, the fixed state of the lower peeling prevention portion 61 becomes stronger, and the peeling prevention effect of the horizontal slide rails 50 and 51 by the peeling prevention structure 6 can be enhanced. When a plurality of connecting members 56 are provided, the size of the front and rear foot brackets 52 and 54 shall be appropriately changed to a size sufficient to attach the plurality of connecting members 56 (for convenience of explanation, it is shown in FIG. 18). The wide rear foot bracket 54A is attached, and the front foot bracket 52, which is not shown in FIG. .).
The back pipe frame 22, foot bracket 52, foot bracket 54, and connecting member 56 are configured as described above.

As shown in FIGS. 15 and 17, the upper detachment preventing portion 60 is arranged behind the left mounting portion 22a to which a child seat (not shown) is mounted. Note that not only the upper peeling preventing portion 60 but also the peeling preventing structure 6 itself is arranged behind the left mounting portion 22a, and when the peeling preventing structure 6 is viewed straight from the rear, the peeling preventing structure 6 , and the left mounted portion 22a are arranged at substantially the same position in the left-right direction of the seat frame 1. As shown in FIG.
The upper detachment prevention part 60 is positioned at the upper end of the upper detachment prevention part 60, and includes a fixing part 600 fixed to the rear surface of the back pipe frame 22, and a main body integrally provided below the fixing part 600. A portion 601 and an upper engaging portion 602 provided integrally with the lower end portion of the body portion 601 .

The fixing portion 600 has a central recess 600a formed so that the central portion in the left-right direction is recessed toward the back pipe frame 22, and left and right flanges formed at the left and right side edges so as to protrude toward the back pipe frame 22. 600b and 600c.
The fixed portion 600 is welded to the back pipe frame 22 at the position where the central recessed portion 600a is formed and the position where the left and right flanges 600b and 600c are formed (welded portion W). The welding positions of the left and right flanges 600b and 600c to the back pipe frame 22 are substantially equal to the welding positions of the left and right ends of the upper end of the rear surface of the mounted portion 22a to the back pipe frame 22 in the left-right direction of the seat frame 1. relationship.

The body portion 601 is wider in the left and right direction than the fixed portion 600 . Further, a plurality of beads 601a are formed side by side on the rear surface of the main body portion 601 for improving the rigidity of the main body portion 601. As shown in FIG. These beads 601a are formed longer in the vertical direction than in the horizontal direction.
Left and right flanges (flange shapes) 601b and 601c formed so as to protrude toward the back pipe frame 22 are formed on the left and right side edges of the main body 601 on the fixed portion 600 side. are integrated. The left and right flanges 601b and 601c of the body portion 601 and the left and right flanges 600b and 600c of the fixed portion 600 are integrally formed.

As shown in FIGS. 16 and 17, the upper engaging portion 602 is curved from the lower end portion of the main body portion 601 toward the rear horizontal slide rail 51 so as to have a hook-shaped cross section. In other words, the upper engagement portion 602 is formed in a substantially J-shape when viewed in cross section.

As shown in FIGS. 15 to 17, the lower detachment preventing portion 61 includes a fixing portion 610 fixed to the rear surface of the foot bracket 54 by a bolt 611 and a lower engaging portion integrally provided at the upper end of the fixing portion 610. and a joint 612 .

The fixed portion 610 is fixed by a bolt 611 to the rear side plate portion (described above) that constitutes the foot bracket 54 arranged on the rear left side of the seat. The lower edge of the fixing portion 610 is curved so as to avoid the connecting member 56 projecting backward, and the bolts 611 are fixed on both left and right sides of the connecting member 56 .

As shown in FIG. 16, the lower engaging portion 612 is curved from the upper end portion of the fixing portion 610 toward the upper engaging portion 602 of the upper peeling preventing portion 60 so as to have a hook-shaped cross section. In other words, the lower engaging portion 612 is formed in a substantially inverted J shape when viewed in cross section.

As shown in FIG. 16, the upper engaging portion 602 of the upper peeling preventing portion 60 and the lower engaging portion 612 of the lower peeling preventing portion 61 are in a positional relationship such that they engage with each other. , the foot bracket 54 provided with the lower peeling prevention portion 61 is connected to the front side foot bracket 52 by a connecting member 56 . Therefore, for example, when the vehicle collides with something and a large load is applied, the cushion frame 2 is effectively prevented from being separated from the seat support portion 5 .

In addition, since the upper engaging portion 602 and the lower engaging portion 612 have no flanges or walls at the left and right end portions thereof, the upper engaging portion 602 and the lower engaging portion 612 are engaged. Even in a state where they are in contact with each other, the sliding movement of the seat frame 1 by the lateral slide rails 50 and 51 is not hindered.
Furthermore, the length in the horizontal direction over which the upper engaging portion 602 and the lower engaging portion 612 engage with each other is set wider than the sliding movement length of the horizontal slide rails 50 and 51 .

[Effect of this embodiment]
According to the present embodiment as described above, the plate-like first bracket 41 is inserted into the opening of the cushion side frame 20 having a closed cross-section structure, and the cushion side frame 20 having a closed cross-section structure and Since the anchor point 24 of the seat belt is arranged at the position where the first bracket 41 overlaps, the anchor point 24 of the seat belt is attached to both the cushion side frame 20 and the first bracket 41 having a closed cross section structure. can be set and the rigidity required to provide the anchor point 24 of the seat belt can be ensured.
Furthermore, since the plate-like first bracket 41 is inserted into and fixed to the opening of the cushion side frame 20 having a closed cross-section structure, for example, when the members having a closed cross-section structure are inserted and overlapped with each other. It is easy to manufacture compared to , and it is possible to achieve weight reduction.

In addition, the cushion side frame 20 and the first bracket 41, which have a closed cross-section structure, are connected by bolts 410 and 411 at two locations before and after the position where the cushion side frame 20 and the first bracket 41 overlap. It is possible to improve the connection strength between the cushion side frame 20 and the first bracket 41, which have a closed cross-section structure, and also improve the rigidity of the cushion frame 2 itself.

Further, the front and rear flanges 41a and 41b of the first bracket 41 are in contact with the front and rear inner side surfaces of the inner side surfaces of the cushion side frame 20 having a closed cross-section structure. The load applied to the cushion frame 2 can be dispersed between 41a, 41b and the front and rear inner surfaces.

In addition, since the side surface of the cushion side frame 20 having a closed cross-section structure is formed with a concave portion 200a that is recessed toward the inside, the cross section of the cushion side frame 20 having a closed cross-section structure can be increased. can improve rigidity.

In addition, since the recess 200a is formed near the anchor point 24, the rigidity of the cushion side frame 20 near the anchor point 24 can be improved.

In addition, at least the end portion of the cushion side frame 20 having a closed cross-section among the longitudinal ends of the back pipe frame 22 penetrates the cushion side frame 20 having a closed cross-section from left to right. At least the mounting strength of the back pipe frame 22 to the cushion side frame 20 having a closed cross-section structure can be improved, and the rigidity of the cushion frame 2 itself can also be improved.

Further, since the mounting portion 22a to which the child seat is mounted is welded to both the back pipe frame 22 and the cushion side frame 20 having a closed cross section structure, the mounting strength of the mounting portion 22a to the back pipe frame 22 is increased. In addition, the rigidity of the portion where the back pipe frame 22 and the cushion side frame 20 having a closed cross section are connected can be improved.

The left and right side ends 23a, 23b of the front pipe frame 23 are welded to the webs 200, 210 and the upper and lower flanges 201, 211, 202, 212 of the front ends of the left and right cushion side frames 20, 21, respectively. Therefore, the left and right side ends 23a and 23b of the front pipe frame 23 can be sandwiched and held.

In addition, since the left and right side ends 23a and 23b of the front pipe frame 23 extend rearward from the fixing points (the bolts 500 and 501) of the front side slide rail 50 with respect to the cushion frame 2, The fixed portion of the front horizontal slide rail 50 is a portion with increased rigidity, and the left and right side ends 23a and 23b of the front pipe frame 23 seem to be inserted deeper than the portion with increased rigidity. state. As a result, the load applied to the front pipe frame 23 can be easily dispersed, and the load can be easily supported by the front pipe frame 23 .

The portions where the left and right side ends 23a and 23b of the front pipe frame 23 and the front ends of the left and right cushion side frames 20 and 21 overlap are the fixed portions (bolts 500 and 501) of the front lateral slide rail 50. ), the left and right side ends 23a and 23b of the front pipe frame 23 can be held by the front ends of the left and right cushion side frames 20 and 21 over a wide range.

Moreover, since at least one of the left and right back side frames 30 and 31 has a closed cross-section structure, at least one of the left and right back side frames 30 and 31 can ensure necessary rigidity.
Further, a plate-shaped second bracket 42 having a main body plate portion and a bent plate portion 42c bent in a direction away from the main body plate portion and protruding upward from the side of the cushion frame 2 has a closed cross-sectional structure. Since it is inserted from the opening of the back side frame 30 and joined to the back side frame 30, it is easier to manufacture than, for example, when members having a closed cross-section structure are inserted and overlapped. Weight can be reduced.
Moreover, since the bending plate portion 42c is in contact with the inner side surface of the back side frame 30 having a closed cross section structure, the load applied to the seat back frame 3 can be dispersed at the position where the bending plate portion 42c contacts. .

In addition, the body plate portion of the second bracket 42 is in contact with the inner surface of the back side frame 30 having a closed cross-section structure, and the bent plate portion 42c formed to be bent away from the body plate portion is the body plate. Since the second bracket 42 is formed integrally with the upper end portion of the second bracket 42, the inner side surface positioned inside the seat and the inner side surface positioned outside the seat among the inner side surfaces of the back side frame 30 having a closed cross-section structure. In contrast, contact is made with a shift in the vertical direction. As a result, the seat back frame 3 is more affected than when only one of the inner side surface positioned inside the seat and the inner side surface positioned outside the seat is in contact with the inner side surface of the back side frame 30 having a closed cross-section structure. The load can be distributed effectively.
Furthermore, for example, when a guide bracket 34 used for guiding the seat belt is attached to the upper end of the back side frame 30 having a closed cross section structure, it is assumed that a load is applied in an oblique direction when the seat belt is in use. However, it is easy to disperse the load applied in such an oblique direction.

Holes 300d and 303d are formed in the back side frame 30 having a closed cross-section structure at locations where the second bracket 42 contacts, and the back side frame 30 having a closed cross-section structure is formed using the holes 300d and 303d. and the second bracket 42 are welded, it is easy to weld the second bracket 42 from the outer surface of the back side frame 30 having a closed cross section structure.

The second bracket 42 has flanges 42a and 42b integrally formed on the front edge and the rear edge of the main body plate, respectively. The seatback frame 30 is in contact with the inner side surfaces located on the front side and the rear side among the inner side surfaces of the back side frame 30, and therefore, between the front and rear flanges 42a and 42b and the inner side surfaces on the front side and the rear side, which are in contact with each other, the seat back frame 3 load can be distributed.

In addition, since the front and rear flanges 42a and 42b are welded to the backside frame 30, which has a closed cross-section structure, the backside frame 30 can be firmly attached to the second bracket 42. It becomes easy to support the frame 30 .

In addition, since the recessed portion 300a recessed in the seat inner direction is formed at least on the outer surface of the seat outer side direction of the back side frame 30 having the closed cross section structure, the back side frame having the closed cross section structure is formed. The cross section of 30 can be enlarged and the rigidity can be improved.

In addition, since both ends in the length direction of the lower pipe frame 33 that spans between the left and right back side frames 30 and 31 pass through the left and right back side frames 30 and 31 to the left and right, respectively, the left and right back sides The mounting strength of the lower pipe frame 33 to the frames 30 and 31 can be improved, and the rigidity of the seatback frame 3 itself can also be improved.

In addition, at least the end portion of the back side frame 30 side of the lower pipe frame 33 having a closed cross-sectional structure among the longitudinal ends of the lower pipe frame 33 passes through the recess 300a and does not protrude outside the recess 300a. Therefore, when a cushion pad is provided on the seat back frame 3 and the back side frame 30 having a closed section structure is covered with the cushion pad, the cushion pad and the end portion of the lower pipe frame 33 hardly interfere with each other.

In addition, the seat back frame 3 has an upper pipe frame 32 which is bridged between the left and right back side frames 30 and 31 and has a U-shaped upper pipe frame 32 extending laterally at both ends. If three frames are used, a boundary (cut: edge) is generated between each frame, but if the U-shaped upper pipe frame 32 is used, such a boundary can be eliminated. As a result, for example, when an object collides with the seat back, it is possible to prevent the object from hitting the boundary between the frames, thereby improving safety. In addition, the U-shaped upper pipe frame 32 more easily distributes the load than, for example, the use of three linear frames.
Furthermore, the U-shaped upper pipe frame 32 can reduce the number of parts rather than using three straight frames.

In addition, both ends of the U-shaped upper pipe frame 32 pass through the back side frame 30 having a closed cross-sectional structure in the left and right direction, so that the U-shaped upper pipe frame 32 has a closed cross-sectional structure. The mounting strength to the back side frame 30 can be improved, and the rigidity of the seat back frame 3 itself can also be improved.

Also, since the foot bracket 54 to which the lower peeling preventing portion 61 is fixed is connected to the front foot bracket 52 by the connecting member 56, for example, when the front and rear foot brackets 52 and 54 are not connected by the connecting member 56, As compared with , the fixed state of the lower peeling prevention portion 61 is stronger. In addition, the upper anti-peeling part 60 fixed to the cushion frame 2 side and the lower anti-peeling part 61 fixed to the rear foot bracket 54 of the front and rear foot brackets 52 and 54 connected by the connecting member 56 are engaged with each other so that the cushion frame 2 can be slid by the front and rear lateral slide rails 50, 51. It becomes easier to prevent peeling with.

In addition, since the lower peeling preventing portion 61 is fixed at a position (the position of the bolt 611) in which the connecting member 56 is sandwiched in the rear foot bracket 54, the lower peeling preventing portion 61 is connected to the fixed portion. The member 56 can be brought closer, and the fixed state of the lower peeling preventing portion 61 can be easily strengthened.

Further, since the upper peeling preventing portion 60 is fixed to the back pipe frame 22 provided at the rear end portion of the cushion frame 2, the upper peeling preventing portion 60 is fixed to the horizontal slide rail 51, for example. , the fixing strength of the upper peeling preventing portion 60 can be increased.

In addition, the fixing portion 600 of the upper peeling prevention portion 60 has a central recessed portion 600a that is recessed toward the back pipe frame 22 at the center of the fixing portion 600 in the left-right direction. can be increased in cross section, and the rigidity can be improved.

In addition, since the upper peeling prevention portion 60 is welded to the back pipe frame 22 at the central recessed portion 600a of the fixing portion 600 and the left and right end portions (flanges 600b and 600c) of the fixing portion 600, the upper peeling prevention portion 60 can be welded to the back pipe frame 22 at a plurality of positions. , and the fixing strength to the back pipe frame 22 can be improved.

In addition, since the upper peeling prevention portion 60 has flange shapes 601b and 601c below the positions of the left and right ends of the fixed portion 600 welded to the back pipe frame 22, the rigidity at the portion below the fixed portion 600 is increased. can be improved. As a result, the upper peeling prevention portion 60 is less likely to deform, so that the engagement between the upper peeling prevention portion 60 and the lower peeling prevention portion 61 is less likely to be disengaged.
Furthermore, for example, when the seat belt is pulled and the upper peeling preventing portion 60 is about to deform in the diagonally forward direction, the portions of the flange shapes 601b and 601c are brought into contact with the lower peeling preventing portion 61 and its surroundings, causing displacement. amount can be suppressed.

Further, since the upper peeling prevention portion 60 is arranged behind the mounting portion 22a to which the child seat is mounted and at substantially the same position in the left-right direction, the upper peeling prevention portion 60 and the upper peeling prevention portion 60 are arranged in the back pipe frame 22. It is possible to improve the rigidity in the vicinity where the mounting portion 22a is provided. As a result, the attachment state of the child seat attached to the attached portion 22a can be improved.

In addition, the welding points of the attached portion 22a to the back pipe frame 22 and the welding points at the left and right ends (flanges 600b and 600c) of the fixing portion 600 of the upper peeling prevention portion 60 are substantially equal in the left and right direction. Since it is arranged at the position, it is possible to improve the rigidity of the back pipe frame 22 in the vicinity of the weld between the upper peeling prevention portion 60 and the mounting portion 22a, and also improve the fixing strength of the upper peeling prevention portion 60. As shown in FIG.

In addition, since the portion of the upper peeling prevention portion 60 that engages with the lower peeling prevention portion 61 is formed to be longer and wider in the horizontal direction than the fixed portion 600, the horizontal slide rails 50 and 51 move the cushion frame 2. is slid left and right, the engagement between the upper peeling preventing portion 60 and the lower peeling preventing portion 61 is less likely to be disengaged.

In addition, since the upper peel-preventing portion 60 includes the bead 601a extending vertically on the surface of the upper peel-preventing portion 60, the rigidity of the upper peel-preventing portion 60 can be improved. As a result, the upper peeling prevention portion 60 is less likely to deform, so that the engagement between the upper peeling prevention portion 60 and the lower peeling prevention portion 61 is less likely to be disengaged.

<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, only constituent parts different from those of the above-described first embodiment will be explained.

The seat frame 1 shown in FIGS. 19 to 21 is provided with armrests 7 for supporting the arms of a person seated on the vehicle seat.
The armrest 7 is attached to the side surface of the seat frame 1 so as to be freely rotatable in the front-rear direction. Although not shown, the armrest 7 is provided with a cushion pad and is covered with an outer skin.
19 and 20, the armrest 7 in this embodiment is in a horizontal state (substantially horizontal state, (including near-horizontal state, etc.) can be maintained without angle change. On the other hand, as shown in FIG. 21, it is configured to be able to maintain the stored state in which it does not support the human arm.
It should be noted that the armrests 7 in the present embodiment are provided on both the left and right sides of the vehicle seat, but the case where the armrests 7 are provided on the right side of the vehicle seat will be described below. Further, in the present embodiment, the armrests 7 are provided on both the left and right sides of the vehicle seat, but they may be provided on either the left or right side.

As shown in FIGS. 22 and 23, the armrest 7 has a mounting bracket 70, a main frame 71, a link mechanism 72, a biasing member 73, and an angle restricting means 74. 72 includes the reclining mechanism 4 described above.
The biasing member 73 in the present embodiment is a tension spring, and is configured to exert a biasing force in a direction in which the part where one end of the tension spring is hooked and the part where the other end is hooked are pulled together. It is

The mounting bracket 70 is mounted on the outer surface (right side) of the right back side frame 31 of the seat back frame 3 . A main frame 71 is attached to the attachment bracket 70 via a link mechanism 72 , a biasing member 73 , and an angle regulating means 74 .
The mounting bracket 70 is formed in a hollow box shape including a box portion 70a attached to the back side frame 31 and a lid portion 70b closing the opening of the box portion 70a. It is A through hole 700 is formed in the center of the lid portion 70b so as to pass through the outer side surface of the mounting bracket 70 in the left and right direction, into which the tip of a pivot pin 727, which will be described later, is inserted and fixed.

The main frame 71 includes a main body plate portion 710 arranged vertically so as to face the back side frame 31 , a flange 711 integrally formed continuously with the peripheral edge portion of the main body plate portion 710 , and a rear end of the main frame 71 . A first hook portion 712 integrally formed with the flange 711 is provided near the top of the portion.

The main body plate portion 710 is formed such that the vertical dimension gradually decreases from the base end portion attached to the mounting bracket 70 toward the tip end portion.
In addition, a through hole 710a is formed in the center of the base end portion to constitute the rotation center (joint C) of the armrest 7. Above the through hole 710a in the base end portion, a stopper pin (to be described later) is provided. A slot hole 710b into which 741 is inserted is curved in a semicircular shape.
The flange 711 is formed so as to protrude outward (to the right in this embodiment) from the periphery of the body plate portion 710 .
The first hook portion 712 is a portion on which one end of the tension spring that is the biasing member 73 is hooked, and is formed to protrude further outward from the tip of the flange 711 . The first hooking portion 712 may have a hole through which one end of the tension spring that is the biasing member 73 is passed.

As shown in FIGS. 19 and 20, the link mechanism 72 is a parallel link mechanism that maintains a parallel positional relationship between the constituent elements of the link mechanism 72 when the seatback frame 3 is reclining. .
As shown in FIGS. 18 to 23, such a link mechanism 72 includes a first link 720, a second link 721, a fixed bracket 722, a bearing member 723, a first rotating shaft member 724, a second A rotating shaft member 725, a washer member 726, a pivot pin 727, a rotating shaft 4a (joint D) in the reclining mechanism 4, and a third bracket 43 in the reclining mechanism 4 (second bracket 42 in the case of the left side) and

The first link 720 is a plate-like link that constitutes the upper link of the link mechanism 72 and is elongated in the front-rear direction.
The first link 720 has a first through hole 720a forming the rotation center (joint C) of the armrest 7 at its front end, and a second through hole 720b in the center into which a stopper pin 741 is inserted. , and a third through hole 720c that serves as a connecting portion (joint A) with the second link 721 is formed.

The second link 721 is a plate-like link that constitutes the rear link of the link mechanism 72 and is elongated in the vertical direction.
In addition, the second link 721 has a first through hole 721a at its upper end, which serves as a connecting portion with the first link 721, and a connecting portion (joint B) with the fixed bracket 722 at its lower end. A second through hole 721b is formed.

The fixed bracket 722 is fixed to the rear edge flange 43 b of the upper end of the third bracket 43 . The fixed bracket 722 is formed with a through hole (not shown) that serves as a connecting portion (joint B) with the second link 721 .
In the present embodiment, the fixed bracket 722 is fixed to the third bracket 43 and is in an integrated state, but the present invention is not limited to this. may be formed. By integrally forming the fixed bracket 722 and the third bracket 43, the link mechanism 72 can be configured without increasing the number of parts. Note that when the separate fixing bracket 722 and the third bracket 43 are fixed in an integrated state as in this embodiment, the fixing position of the fixing bracket 722 can be appropriately adjusted, and the link mechanism 72 is included. The design of the armrest 7 is easy.

The bearing member 723 (also referred to as a bush) is formed in a cylindrical shape having a cylindrical hole portion 723a, and a pivot pin 727 is passed through the cylindrical hole portion 723a.
The outer shell of the cylindrical wall portion 723b that constitutes the cylindrical hole portion 723a is formed to have different diameters in three stages, and the portion with the longest diameter is fixed to the mounting bracket 70. As shown in FIG. The portion with the shortest diameter dimension is a portion that is passed through each through hole in the main frame 71, the first link 720, a washer member 726 described later, and a pivot bracket 740 described later.

The first rotating shaft member 724 is passed through the third through hole 720c in the first link 720 and the first through hole 721a in the second link 721, and rotatably connects the first link 720 and the second link 721. It is something to do.
In this embodiment, a rivet is used as the first rotating shaft member 724, and after passing through the third through hole 720c in the first link 720 and the first through hole 721a in the second link 721, , the tip is crushed so that the first link 720 and the second link 721 can be connected.

The second rotating shaft member 725 is passed through the second through hole 721b in the second link 721 and the through hole in the fixed bracket 722, and rotatably connects the second link 721 and the fixed bracket 722 together.
In this embodiment, rivets are used in the same way as the first rotating shaft member 724, and as shown in FIG. It's becoming

The washer member 726 is an annular plate-shaped member having a through hole in the center, and is provided in a state of being sandwiched between the pivot pin 727 and a pivot bracket 740 to be described later.

The pivot pin 727 is a shaft member passed through the through hole 700 in the mounting bracket 70 .
The pivot pin 727 includes a first shaft portion 727a having a short diameter formed at the tip, a second shaft portion 727b having a longer diameter than the first shaft portion 727a, and an inner diameter of the through hole of the washer member 726. and a flange portion 727c having a longer outer diameter.
The first shaft portion 727 a and the second shaft portion 727 b are passed through the cylindrical hole portion 723 a of the bearing member 723 , and the first shaft portion 727 a is passed through the through hole 700 of the mounting bracket 70 . The first shaft portion 727a is fixed to the mounting bracket 70 on the inner surface side of the lid portion 70b.
The flange portion 727 c is in contact with the outer surface of the washer member 726 .

The angle regulating means 74 is a means for maintaining a constant angle of the main frame 71 by being used together with the link mechanism 72 and the biasing member 73, and maintains the horizontal state of the main frame 71 in use. , in the stored state, it is configured to maintain the stored state.
Such an angle restricting means 74 has a pivot bracket 740 and a stopper pin 741 .

The pivot bracket 740 is a substantially elliptical plate-like body, and integrally formed with a front end portion thereof is a second hook portion 740a on which the other end of the tension spring that is the biasing member 73 is hooked. The second hooking portion 740a protrudes in the same direction (outside) as the first hooking portion 712, and the position of the tip in the direction of protrusion is set substantially equal to the position of the tip in the direction of protrusion of the first hooking portion 712. .
A first through hole 740b through which the cylinder wall portion 723b of the bearing member 723 is passed is formed in the center of the pivot bracket 740, and a second through hole 740b through which the stopper pin 741 is passed is formed in the rear end portion of the pivot bracket 740. A through hole 740c is formed.

The stopper pin 741 functions to maintain the horizontal state of the main frame 71 , and is passed through the second through hole 740 c in the pivot bracket 740 and the slot hole 710 b in the main frame 71 .
In this embodiment, a rivet is used as the stopper pin 741, and after passing through the second through hole 740c in the pivot bracket 740 and the slot hole 710b in the main frame 71, the tip is crushed, thereby The frame 71 and the pivot bracket 740 can be connected.

19 and 20, the link mechanism 72 includes a joint A, a joint B, a joint C based on the rotation center of the armrest 7, and a joint D based on the rotation shaft 4a serving as the rotation center of the seatback frame 3. The seatback frame 3, the first link 720, and the second link 721 are rotatable about the axis.
When the seatback frame 3 is reclined and the link mechanism 72 is operated, the positions of the joints B and D do not change because they include the reclining mechanism 4 . On the other hand, since the position of joint A and the position of joint C vary according to the position of seatback frame 3, first link 720 and second link 721 rotate.
The tension spring, which is the biasing member 73, is located above the pivot pin 727 and biases the first hooking portion 712 of the main frame 71 and the second hooking portion 740a of the pivot bracket 740 in the direction of pulling them together. there is At this time, the main frame 71 is biased to rotate in the direction of the arrow Y1, but the stopper pin 741 is in contact with the rear end of the slot hole 710b. 7) can maintain the horizontal state. Moreover, such a horizontal state of the main frame 71 can be maintained even if the reclining angle of the seat back frame 3 is changed.

The retracted state of the armrest 7 refers to a state in which the armrest 7 is rotated so that the lengthwise direction of the armrest 7 and the lengthwise direction of the seat back frame 3 are aligned, as shown in FIG. 20 .
To bring the armrest 7 into the stowed state, the main frame 71 is lifted upward and rotated. At this time, the stopper pin 741 is separated from the rear end of the slot hole 710b, and the biasing member 73 is displaced from above the pivot pin 727 to below it. Since the biasing member 73 pulls the first hooking portion 712 and the second hooking portion 740a together, a biasing force acts on the main frame 71 to rotate it in the direction of the arrow Y2. The reduction in the biasing force of the biasing member 73 (the state in which the tension spring, which is the biasing member 73, is fully contracted) is aligned with the position where the length direction of the armrest 7 and the length direction of the seat back frame 3 are aligned. By placing it, the stored state of the main frame 71 (armrest 7) can be maintained.

When the main frame 71 is moved from the housed state to the horizontal state, the biasing force of the biasing member 73 acts in the direction of the arrow Y2 at first, but the main frame 71 is rotated downward against the biasing force. As the stopper pin 741 moves closer to the rear end of the slot hole 710b, the position of the biasing member 73 gradually moves upward.
When the position of the biasing member 73 is displaced above the pivot pin 727 and the stopper pin 741 and the rear end of the slot hole 710b are brought closer together, a biasing force is applied to the main frame 71 in the direction of the arrow Y1. works.
When the stopper pin 741 comes into contact with the rear end of the slot hole 710b, the main frame 71 is in a horizontal state, and the horizontal state can be maintained by the biasing force of the biasing member 73. As shown in FIG.

In the illustrated example, the main frame 71 is open toward the outside (to the right in this embodiment), but the main frame 71 has a cover frame (not shown) that covers the open portion. shall be provided. In addition, a cushion pad is provided around the main frame 71 and the cover frame, and is further covered with an outer skin.

According to this embodiment, when the seatback frame 3 is tilted with respect to the cushion frame 2 by the reclining mechanism 4 and the link mechanism 72 is displaced, the main frame 71 is held in a horizontal state by the angle regulating means 74 and attached. Since the main frame 71 is urged forward in the rotational direction by the urging member 73, the link mechanism 72 is displaced no matter what angle the seatback frame 3 is tilted with respect to the cushion frame 2 by the reclining mechanism 4. The horizontal state of the main frame 71 can be maintained as much as possible. As a result, the armrest 7 can be maintained in a horizontal state with a simpler structure than the conventional one.

In addition, the biasing member 73 is a tension spring having one end hooked on the first hook 712 of the main frame 71 and the other end hooked on the second hook 740a of the angle regulating means 74. The first hooking portion 712 of the frame 71 can be pulled toward the second hooking portion 740a of the angle regulating means 74, and the main frame 71 can be easily biased.

Further, in the stored state in which the main frame 71 is rotated rearward so that the length direction of the main frame 71 and the length direction of the side surface of the seat back frame 3 are aligned, the biasing member 73 moves the main frame 71 in the rotation direction. Since it is biased to the rear side, the main frame 71 can be retracted within a range in which the link mechanism 72 can be displaced even if the seat back frame 3 is tilted to any angle with respect to the cushion frame 2 by the reclining mechanism 4. state can be preserved.

[Modification]
It should be noted that the embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be modified as appropriate without departing from the gist of the present invention. Modifications will be described below. The modifications listed below may be combined as much as possible.
Further, in each of the following modified examples, elements common to those of the above-described embodiment are denoted by common reference numerals, and explanations thereof are omitted or simplified.

[Modification 1]
As shown in FIG. 24, in the seat frame 1 according to this modified example, both the left and right back side frames 30, 31A forming the seat back frame 3 have a closed cross-sectional structure.
That is, in this modified example, unlike the above-described embodiment, the right back side frame 31A is integrally formed as a hollow body having a closed cross-sectional structure by connecting the right split body 31a and the left split body 31b. there is

The right split body 31a is formed symmetrically with the left split body 30a in the above embodiment, and the left split body 31b is formed symmetrically with the right split body 30b in the above embodiment.

In addition, since the right back side frame 31A has a closed section structure, instead of the U-shaped upper pipe frame 32 in the above embodiment, a single upper pipe frame 32A extending in the lateral direction and A single middle pipe frame 32B extending to the middle pipe frame 32B is used.
Furthermore, in the reclining mechanism 4 as well, a second bracket 42 configured symmetrically with the second bracket 42 may be used instead of the third bracket 43 in the above embodiment. In this case, the right cushion side frame 21 in the cushion frame 2 may also have a closed cross-sectional structure like the left cushion side frame 20 .

According to this modification, since the left and right back side frames 30 and 31A that constitute the seatback frame 3 have a closed cross-sectional structure, the seatback frame 3 is more flexible than the case where only one side has a closed cross-sectional structure. can improve the rigidity of
Further, the seat belt guide bracket 34 can be attached not only to one back side frame 30 but also to both back side frames 30 and 31A. For example, among rear seats in which three seats are arranged in a horizontal row, the narrow seat may not be provided with the guide bracket 34 . In such a case, the left and right back side frames 30, 31A of one seat adjacent to the narrow seat have a closed cross-sectional structure, and a guide bracket 34 for the narrow seat is provided at the upper end of each of them, and the guide brackets 34 for the adjacent sheets, respectively. As a result, it is possible to cope with the case where the guide bracket 34 cannot be provided on the narrow sheet.

[Modification 2]
As shown in FIG. 24, a reinforcing frame 35 is provided on the upper pipe frame 32 of the seat back frame 3 in this modified example.
The reinforcement frame 35 is diagonally bridged and fixed between the lower pipe 32c of the upper pipe frame 32, the intermediate pipes 32b on the left and right sides of the lower pipe 32c, and the back side frame 30 on the left side. It is wood.
That is, one reinforcing frame 35 is obliquely provided so as to straddle the bent portion between the lower pipe 32c and the intermediate pipe 32b, and the other reinforcing frame 35 is provided between the lower pipe 32c and the left back side frame. 30 is obliquely provided so as to straddle the portion in contact with .

According to this modification, a truss structure composed of the left back side frame 30, the upper pipe frame 32, and the reinforcing frame 35 can be formed at the position where the upper pipe frame 32 is provided. It is possible to improve the rigidity of the portion provided with the , and thus the rigidity of the seat back frame 3 .

[Modification 3]
In the seat back frame 3 of this modified example, instead of the U-shaped upper pipe frame 32 of the above-described embodiment, as shown in FIG. A plate-like middle frame 32D is used.

The middle frame 32</b>D is formed in a plate shape, and is provided so as to span between the left and right back side frames 30 and 31 . In this embodiment, the middle frame 32D spans between the rear surfaces of the left and right back side frames 30, 31, but is not limited to this, and spans between the front surfaces. Alternatively, it may be bridged between intermediate portions in the front-rear direction.

Further, between the middle frame 32D and the lower pipe frame 33, left and right connecting frames 36 are mounted across.
The connecting frame 36 has a web and left and right flanges, and is provided not only to connect the middle frame 32D and the lower pipe frame 33, but also to improve the rigidity of the seatback frame 3 as a whole. there is

According to this modification, since the middle frame 32D is formed in a plate shape, it is easy to attach other members such as a dynamic damper for damping vibration and a cover for covering the seatback frame to the middle frame 32D. Become.
Further, since the middle frame 32D and the lower pipe frame 33 can be connected by the connecting frame 36, the connecting frame 36 can also be used for attaching other members like the middle frame 32D. Moreover, by connecting the middle frame 32D and the lower pipe frame 33, the rigidity of the seatback frame 3 can be improved.

[Modification 4]
Instead of the front pipe frame 23 in the above-described embodiment, the cushion frame 2 in this modified example has a central portion 230 that is turned rearward with respect to the left and right side end portions 231 and 232 as shown in FIG. , and a front pipe frame 23A that is bent upward.

More specifically, the front pipe frame 23A includes left and right side end portions 231, 232 held by the left and right cushion side frames 20, 21, and a central portion 230 provided between the left and right side end portions 231, 232. , provided.
The central portion 230 is bent rearward and upward while left and right side end portions 231 and 232 extend forward.
Bending portions 230a and 230b are provided between the central portion 230 and the left and right side end portions 231 and 232, and the bending directions of the central portion 230 are determined at the bending portions 230a and 230b.

Between the central portion 230 of the front pipe frame 23A and the back pipe frame 22, pressure-receiving members 26a and 26b for receiving the load of a person seated on the vehicle seat are bridged and provided.
The pressure-receiving members 26a and 26b are wires, and the front portion of the seat is bent upward corresponding to the central portion 230 of the front pipe frame 23A. One pressure receiving member 26 a has a U-shaped front end portion that protrudes forward from the central portion 230 . The other pressure receiving member 26b has a front end hooked on the central portion 230 .

It is assumed that the seat rear side portions of the pressure receiving members 26 a and 26 b are hooked to the back pipe frame 22 .
The intermediate portions of the pressure receiving members 26a and 26b are set at substantially the same height as the left and right end portions 231 and 232 of the front pipe frame 23A.
Further, the shape of the cushion frame can be adjusted by these pressure receiving members 26a and 26b.

Such a cushion frame 2 is provided with a cushion pad (not shown) and covered with a skin. The cushion pad is formed so that the center of the front end portion swells according to the protruding state of the central portion 230 of the front pipe frame 23A.

According to this modification, the center of the front end portion of the cushion frame 2 can be formed so as to bulge upward, making it difficult for a person seated on the vehicle seat to move forward from the seat. As a result, for example, it is possible to prevent the body from sinking when the vehicle collides.

1 Seat frame 2 Cushion frame 20 Cushion side frame 20a Left split body 20b Right split body 21 Cushion side frame 22 Back pipe frame 22a Attached part 23 Front pipe frame 24 Anchor point 3 Seat back frame 30 Back side frame 30a Left split body 30b Right side Divided body 31 Back side frame 32 Upper pipe frame 33 Lower pipe frame 34 Guide bracket 4 Reclining mechanism 4a Rotating shaft 40 Round recliner 41 First bracket 42 Second bracket 42a Flange 42b Flange 42c Bending plate portion 43 Third bracket 5 Seat support portion 50 Horizontal slide rail 50a Fixed rail 50b Movable rail 51 Horizontal slide rail 51a Fixed rail 51b Movable rail 52 Foot bracket 53 Foot bracket 54 Foot bracket 55 Foot bracket 56 Connecting member 6 Separation prevention structure 60 Upper separation prevention portion 602 Upper engagement portion 61 Lower peeling prevention part 612 Lower engaging part 7 Armrest 70 Mounting bracket 71 Main frame 710b Slot hole 712 First hook part 72 Link mechanism 720 First link 721 Second link 722 Fixed bracket 723 Bearing member 724 First rotating shaft member 725 Second rotating shaft member 726 Washer member 727 Pivot pin 73 Biasing member 74 Angle regulating means 740 Pivot bracket 740a Second hook portion 741 Stopper pin A Joint B Joint C Joint D Joint W Welding portion

Claims (9)

A cushion frame that forms a skeleton of a seat cushion that supports the thighs and buttocks of a person, a seat support that supports the cushion frame on the floor of a vehicle, and a seat support that is provided between the cushion frame and the seat support. A reinforcing structure for a vehicle seat, comprising:
The seat support portion
a pair of left and right front and rear slide rails installed on the floor of the vehicle and comprising a fixed rail and a movable rail for sliding the cushion frame in the front and rear direction of the vehicle;
a front-rear horizontal slide rail provided on the lower surface of the cushion frame and having a fixed rail and a movable rail for sliding the cushion frame in the left-right direction;
a plurality of foot brackets provided on the left and right sides of each of the front and rear lateral slide rails, and having lower ends thereof attached to the pair of left and right front and rear slide rails to support the cushion frame;
a connection member that connects the plurality of foot brackets, which are arranged at intervals in the front-rear direction on at least one of the left side of the seat and the right side of the seat, and
The detachment prevention structure is
an upper separation preventing portion fixed to the cushion frame;
a lower peeling preventing portion fixed to a rear side foot bracket of the front and rear foot brackets connected by the connecting member of the seat support portion,
the upper peel-preventing portion and the lower peel-preventing portion are engaged with each other so that the cushion frame can be slidably moved by the front and rear lateral slide rails;
The upper peeling prevention portion is fixed to a back pipe frame provided at the rear end portion of the cushion frame,
A mounting portion to which the child seat is mounted is welded to the back pipe frame,
The reinforcing structure for a vehicle seat , wherein the upper peeling prevention portion is arranged behind the mounting portion and at substantially the same position in the left-right direction. 2. The reinforcing structure of a vehicle seat according to claim 1, wherein the lower peeling preventing portion is fixed to a position of the rear foot bracket so as to sandwich the connecting member. 2. The upper separation preventing portion has a fixing portion fixed to the back pipe frame, and a flange shape formed below positions of left and right end portions of the fixing portion. 3. The reinforcing structure for the vehicle seat according to 2. 4. The reinforcing structure for a vehicle seat according to claim 3, wherein the fixing portion is formed with a concave portion recessed toward the back pipe frame at a center of the fixing portion in the left-right direction. 5. The vehicle according to claim 4, wherein the upper peeling prevention portion is welded to the back pipe frame at the recess in the center of the fixing portion and at both lateral end portions of the fixing portion. Reinforcing structure of the seat. The welded portion of the attached portion to the back pipe frame and the welded portion of the fixing portion of the upper peeling prevention portion at both left and right ends are arranged at substantially equal positions in the left and right direction. The reinforcing structure for a vehicle seat according to any one of claims 3 to 5. 7. The vehicle according to claim 6, wherein a portion of the upper peeling prevention portion that engages with the lower peeling prevention portion is formed to be longer and wider in the left-right direction than the fixing portion. Reinforcement structure of the seat for. The reinforcement of the vehicle seat according to any one of claims 1 to 7, wherein the upper peel-preventing portion has a bead formed on the surface of the upper peel-preventing portion so as to extend in the vertical direction. structure. A cushion frame that forms a skeleton of a seat cushion that supports a person's thighs and buttocks, a seat back frame that has a lower end supported by the seat cushion and forms a skeleton of a seat back that serves as a backrest, and the cushion. a seat support for supporting a frame on the floor of a vehicle; a separation prevention structure provided between the cushion frame and the seat support; a cushion pad provided on the cushion frame and the seat back frame; A reinforcing structure for a vehicle seat comprising: a skin covering a cushion pad;
The seat support portion
a pair of left and right front and rear slide rails installed on the floor of the vehicle and comprising a fixed rail and a movable rail for sliding the cushion frame in the front and rear direction of the vehicle;
a front-rear horizontal slide rail provided on the lower surface of the cushion frame and having a fixed rail and a movable rail for sliding the cushion frame in the left-right direction;
a plurality of foot brackets provided on the left and right sides of each of the front and rear lateral slide rails, and having lower ends thereof attached to the pair of left and right front and rear slide rails to support the cushion frame;
a connection member that connects the plurality of foot brackets, which are arranged at intervals in the front-rear direction on at least one of the left side of the seat and the right side of the seat, and
The detachment prevention structure is
an upper separation preventing portion fixed to the cushion frame;
a lower peeling preventing portion fixed to a rear side foot bracket of the front and rear foot brackets connected by the connecting member of the seat support portion,
the upper peel-preventing portion and the lower peel-preventing portion are engaged with each other so that the cushion frame can be slidably moved by the front and rear lateral slide rails;
The upper peeling prevention portion is fixed to a back pipe frame provided at the rear end portion of the cushion frame,
A mounting portion to which the child seat is mounted is welded to the back pipe frame,
The reinforcing structure of a vehicle seat , wherein the upper peeling prevention portion is arranged behind the mounting portion and at substantially the same position in the left-right direction.

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