Seat cushion spring and seat

Abstract

The invention provides a seat cushion spring and a seat, which can suppress the deviation of ischium supporting reaction force caused by the body type difference of a seated occupant. The invention relates to a seat cushion spring and a seat. The seat cushion spring (10) is provided with a forming line (11) erected on a seat cushion frame in the front-back direction of the seat. The molding wire (11) has an ischium support section (SA) that supports the ischium of the seated occupant via the seat cushion cushion (3). The ischium support section (SA) forms a coplanar spring surface that does not bend in the vertical direction of the seat in the entire region (R) in the front-rear direction of the seat between a first ischium support site (SA1), which serves as a support for the ischium when the AM95 mannequin is seated, and a second ischium support site (SA2), which serves as a support for the ischium when the AM95 mannequin is seated, in the entire region (R) in the front-rear direction of the seat between the first ischium support site (SA1) and the second ischium support site (SA2). The second ischium supporting part (SA2) serves as a supporting part of the ischium when the JM32 human body model is seated.

Description

Technical Field

[0001] The present invention relates to a seat cushion spring and a seat, and more particularly to a seat cushion spring which is mounted on a seat cushion frame in the front-rear direction of a seat and receives a load from a seated occupant on a surface thereof, and a seat having the seat cushion spring. Background Art

[0002] Patent Document 1 discloses a cushion spring that is mounted on a seat cushion frame constituting a frame of a seat cushion and receives a load from a seated occupant on its surface. The cushion spring includes a pair of left and right molded wires that are mounted between a frame front portion and a frame rear portion of the seat cushion frame.

[0003] Specifically, each shaping line is bent into a valley shape at a portion of the seat cushion cushion supporting the ischium of the seated occupant, in accordance with the shape of the cushion cushion expanding downward and becoming thicker.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-73115 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the configuration described in Patent Document 1, the shapes of the seat cushion cushion pad and each forming line are set based on a human body model corresponding to a specific body type such as AM50. Therefore, when the ischium position deviates from the target position due to differences in the body types of seated passengers, the ischium support reaction force deviates, and the posture of the seated passenger is easily deformed from the target posture. Therefore, the present invention provides a seat cushion spring capable of suppressing the deviation of the ischium support reaction force caused by differences in the body types of seated passengers.

[0009] Technical solutions to solve problems

[0010] As a means for solving the above-mentioned problems, the seat cushion spring of the present invention adopts the following means.

[0011] That is, the first invention of the present invention is a seat cushion spring, which is mounted on a seat cushion frame in the front-rear direction of the seat to bear the load of the seated occupant on its surface, wherein the seat cushion spring has a forming line mounted on the seat cushion frame in the front-rear direction of the seat, the forming line having a ischium supporting portion that supports the ischium of the seated occupant via a seat cushion buffer pad, the ischium supporting portion forming a coplanar spring surface without curvature in the seat up-down direction throughout the entire area in the front-rear direction of the seat between them including a first ischium supporting portion and a second ischium supporting portion, the first ischium supporting portion being a supporting portion for the ischium when a human body model of AM95 is seated, and the second ischium supporting portion being a supporting portion for the ischium when a human body model of JM32 is seated.

[0012] Here, the AM95 mannequin is a mannequin with a larger body type that matches 95% of American men. On the other hand, the JM32 mannequin is a mannequin with a smaller body type that matches 32% of Japanese men. Therefore, most people have a body type that matches a body type between the AM95 mannequin and the JM32 mannequin.

[0013] According to the first invention, the ischium supporting portion of the shaped wire is formed to have a shape having a coplanar spring surface in the above-mentioned region, and thus variations in ischium supporting reaction force due to differences in body shapes of seated occupants can be appropriately suppressed.

[0014] The seat cushion spring of the second invention of the present invention is based on the above-mentioned first invention, and the forming line has a plurality of line portions in the seat width direction, and the line portions are mounted on the seat cushion frame in the front-rear direction of the seat, and the plurality of line portions are arranged to deviate from the seat width direction from just below the ischium when the AM95 human body model is seated and from just below the ischium when the JM32 human body model is seated.

[0015] According to the second invention, even if the cushion thickness of the seat cushion cushion arranged in the area is reduced due to the coplanar spring surface formed by the ischium supporting portion of the molded wire, the seating pressure distribution can be appropriately improved.

[0016] The seat cushion spring of the third invention of the present invention is based on the above-mentioned first or second invention, and the forming line is installed on the seat cushion frame in a manner that the spring surface is higher in the front and lower in the rear relative to the track length direction of the slide rail to form an angle, and the slide rail connects the seat cushion frame to the floor in a manner that the seat cushion frame can slide in the front and rear direction of the seat relative to the floor.

[0017] According to the third invention, the seat cushion spring can be provided so as to suppress the forward sliding of the buttocks of the seated occupant.

[0018] The fourth invention of the present invention is a seat, comprising a seat cushion spring as described in any one of the first to third inventions above, wherein the seat comprises a seat cushion buffer pad, the seat cushion buffer pad being arranged in a manner covering the entire upper area of ​​the seat cushion frame from above the seat, and the thickness of the seat cushion buffer pad being constant for a portion of the seat cushion buffer pad arranged in an area in the front-rear direction of the seat.

[0019] According to the fourth aspect of the present invention, it is possible to appropriately suppress variations in the ischial support reaction force caused by differences in the body shapes of seated passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a perspective view showing a schematic structure of a cushion spring according to the first embodiment.

[0021] Figure 2 It is a perspective view showing the inner frame of a seat cushion.

[0022] Figure 3 It is a three-dimensional diagram of a seat spring.

[0023] Figure 4 It is a three-dimensional diagram of the forming line.

[0024] Figure 5 It is a top view of the seat spring.

[0025] Figure 6 is along Figure 5 This is a cross-sectional view of the seat cushion cut along line VI-VI.

[0026] Figure 7 This is a cross-sectional view of the seat cushion cut along a vertical plane passing through the center in the seat width direction. DETAILED DESCRIPTION

[0027] Hereinafter, a mode for carrying out the present invention will be described using the drawings.

[0028] 《First Implementation Mode》

[0029] (Schematic Structure of Seat Cushion Spring 10)

[0030] First, use Figure 1 to Figure 7 The structure of the cushion spring 10 according to the first embodiment of the present invention will be described. In the following description, when directions such as front, back, up, down, left, and right are indicated, these directions are indicated in the drawings.

[0031] In addition, when "seat" is indicated in each direction such as "seat width direction", it means each direction based on the seat cushion 1. In the following description, when no specific reference figure is shown or when there is no corresponding reference numeral in the reference figure, reference will be made to the reference numeral as appropriate. Figure 1 to Figure 7 Any of the graphs in .

[0032] like Figure 1 As shown, the cushion spring 10 of the present embodiment is applied to a seat cushion 1 of a vehicle seat. The vehicle seat includes a seat back (not shown) serving as a backrest for a seated passenger and a seat cushion 1 serving as a seat portion.

[0033] The seat cushion 1 is installed on the floor of the vehicle (not shown) via the slide rails 5. Thus, the position of the seat cushion 1 in the seat front-rear direction with respect to the floor can be adjusted via the slide rails 5.

[0034] The slide rail 5 is provided at a track angle of approximately 1 degree with respect to a floor (not shown). Thus, the seat cushion 1 is provided at an angle of approximately 1 degree upward relative to the floor via the slide rail 5. The track angle of the slide rail 5 is not limited to 1 degree, but may be 0 degree or 5 degrees. In addition, it may be an angle other than these.

[0035] The seat cushion 1 includes a seat cushion frame 2 constituting a frame thereof and a seat cushion cushion pad 3 covering the seat cushion frame 2 from above. The seat cushion 1 also includes a seat cushion cover 4 covering the seat cushion cushion pad 3 from the cushion pad surface side.

[0036] The seat cushion 1 also includes a cushion spring 10 that is spanned on the seat cushion frame 2 in the seat front-rear direction. The cushion spring 10 functions as a cushion receiving portion that receives a load of a seated occupant on its surface via the seat cushion cushion pad 3 .

[0037] like Figure 2 As shown in FIG. 1 , the seat cushion frame 2 is composed of metal parts assembled into a frame shape in a plan view. Specifically, the seat cushion frame 2 includes lower arms 2A constituting left and right side frames of the seat cushion 1, and a front pipe 2B integrally mounted between the front portions of the lower arms 2A. In addition, the seat cushion frame 2 also includes a rear pipe 2C integrally mounted between the rear portions of the lower arms 2A, and a front panel 2D integrally mounted between the upper edges of the front end portions of the lower arms 2A.

[0038] Reference Figure 1 The seat cushion cushion pad 3 is made of a polyurethane foamed body. The seat cushion cushion pad 3 is provided in a manner to cover the entire upper area of ​​the seat cushion frame 2 from above the seat. Thus, the seat cushion cushion pad 3 is provided in a manner in which its peripheral portion is hard supported by the seat cushion frame 2 from below the seat and its central portion is softly supported by the seat cushion spring 10 from below the seat.

[0039] The seat cushion cover 4 is composed of a fabric surface member. The seat cushion cover 4 covers the seat cushion cushion pad 3 provided on the upper portion of the seat cushion frame 2 from the cushion surface side. And, each end of the front, rear, left, and right sides of the seat cushion cover 4 is pulled under the seat and fixed to the seat cushion frame 2. Thus, the seat cushion cover 4 is widely stretched on the cushion surface of the seat cushion cushion pad 3, and the seat cushion cushion pad 3 is pressed against the upper portion of the seat cushion frame 2 to be kept in a fixed position.

[0040] like Figure 3 As shown in FIG. 1 , the seat cushion spring 10 includes a pair of left and right molded wires 11 formed of round rod-shaped processed springs bent into a U-shape in a plan view, and a resin member 12 connected to each molded wire 11. Figure 4 As shown, each shaping wire 11 is composed of a single wire bent into a U-shape in plan view.

[0041] Specifically, each of the shaping lines 11 is formed of a line bent into a U-shaped shape in plan view, which has a center line 11A and a side line 11B arranged in the seat width direction and extending in the seat front-rear direction. The center line 11A and the side line 11B are formed into a U-shaped shape in plan view, with their rear ends connected to each other and their front ends open. Here, the center line 11A and the side line 11B of each shaping line 11 correspond to the "line portion" of the present invention.

[0042] Each of the shaping lines 11 is symmetrical in shape in the seat width direction. In addition, each of the shaping lines 11 is arranged symmetrically in the seat width direction. Figure 2 As shown, the shaping lines 11 are respectively arranged such that a line arranged on the center side of the seat width direction of the seat cushion frame 2 is a center line 11A, and a line arranged on the outer side is a side line 11B.

[0043] A front hook portion 11C is formed at each front end of the center line 11A and the side line 11B of each shaping line 11. A rear hook portion 11D is formed at each rear end of the center line 11A and the side line 11B of each shaping line 11.

[0044] like Figure 4 As shown, a plurality of crank portions A1 and B1 are formed on the center line 11A and the side line 11B of each forming line 11, respectively, and the plurality of crank portions A1 and B1 are bent in a crank-like shape alternately folded in one direction and the other direction in the seat width direction. In each forming line 11, the crank portions A1 formed on the center line 11A and the crank portions B1 formed on the side line 11B are bent in a shape that is symmetrical in the seat width direction, so as to be close to or away from each other in the seat width direction.

[0045] Each of the shaping lines 11 is formed to extend in the seat width direction in addition to the seat front-rear direction by the crank portions A1 and B1. Thus, each of the shaping lines 11 is configured to support the seat cushion cushion pad 3 in a planar manner from the back side of the cushion pad (see Figure 1 ).

[0046] In each of the shaping lines 11, the center line 11A and the side line 11B are formed to be curved in a V-shape in a side view. Figure 7 As shown, by the V-shaped bending, each shaping line 11 is configured so that the ischium supporting portion SA supporting the ischium of the seated occupant via the seat cushion pad 3 is less likely to have uneven ischium supporting reaction force due to differences in the body shape of the seated occupant.

[0047] like Figure 3 As shown, the resin member 12 is combined with each molding line 11 in a symmetrical shape in the seat width direction. Specifically, the resin member 12 has a pair of deflection restricting portions 12A combined with each molding line 11 in a form extending in the seat front-rear direction along each side line 11B.

[0048] In addition, the resin member 12 has a cushion support surface 12B constituting the upper surface of each deflection restricting portion 12A. Each cushion support surface 12B is formed at a position higher than each side line 11B, and constitutes a cushion support surface 12B for supporting the seat cushion cushion 3 in a planar manner from the back side of the cushion (see Figure 1 ) support surface.

[0049] The resin member 12 also has a connection portion 12C extending in the seat width direction so as to connect the rear portions of the deflection restricting portions 12A. The resin member 12 is integrally formed with the molded wires 11 to be integrally connected with the molded wires 11 .

[0050] Next, the detailed structure of the resin member 12 will be described. Figure 5 As shown, the bending restricting portions 12A are formed to extend continuously in the seat front-rear direction along the straight longitudinal line portions B2 extending intermittently in the seat front-rear direction between the front hook portions 11C and the rear hook portions 11D relative to the side lines 11B. The longitudinal line portions B2 are arranged on the same straight line.

[0051] Thus, each deflection restricting portion 12A is formed to connect all the crank portions B1 adjacent to each other in front and rear of each side line 11B. Each deflection restricting portion 12A has an expansion portion A2 that extends in a manner such that the connection width of the portion connecting the crank portions B1 in the seat width direction continuously expands toward the rear of the seat and toward the inner side in the seat width direction.

[0052] Each expansion portion A2 is formed in a shape extending so as to describe an inner peripheral edge of a concave curved surface in a plan view along the outer edge of the seated person's buttocks. Due to these expansion portions A2, each deflection restricting portion 12A has a shape in which the connection width of the portion connecting the frontmost crank portion B1 of each side line 11B and the second crank portion B1 from the front is the narrowest.

[0053] Furthermore, each deflection restricting portion 12A is formed in a shape that is second to the width of the connection between the second crank portion B1 from the front and the third crank portion B1 from the front of each side line 11B. Furthermore, each deflection restricting portion 12A is formed in a shape that is second to the width of the connection between the third crank portion B1 from the front and the fourth crank portion B1 from the front of each side line 11B.

[0054] Specifically, each deflection restricting portion 12A is formed in such a shape that it extends inwardly in the seat width direction beyond the third crank portion B1 and the fourth crank portion B1 of each side wire 11B in the middle of the portion connecting the third crank portion B1 and the fourth crank portion B1 from the front, and is connected to the connecting portion 12C. In this sense, each expansion portion A2 extending inwardly in the seat width direction beyond the third crank portion B1 and the fourth crank portion B1 from the front becomes a part of the connecting portion 12C.

[0055] Each deflection restricting portion 12A is not formed at a position corresponding to directly below the ischium (not shown) of the seated passenger, but is formed at a position retreated from directly below the ischium toward the outside in the seat width direction. In addition, the connecting portion 12C is not formed at a position corresponding to directly below the ischium of the seated passenger, but is formed at a position retreated from directly below the ischium toward the rear of the seat.

[0056] In addition, each of the shaping lines 11 is not formed at a position corresponding to right below the ischium (not shown) of the seated occupant, but is formed at a position offset from right below the ischium in the seat width direction. Specifically, each of the shaping lines 11 is formed at a position offset from right below the ischium inward and outward in the seat width direction, so that the center line 11A and the side lines 11B are arranged to sandwich positions corresponding to right below the left and right ischiums (not shown) of the seated occupant.

[0057] The bending limiting portions 12A limit the opening of each shaping line 11 in the front-rear direction of the seat between the five crank portions B1 arranged in front and behind the side line 11B. More specifically, due to the shape of the connection width change of the bending limiting portions 12A, the opening between the frontmost crank portion B1 and the second crank portion B1 from the front of each side line 11B in the front-rear direction of the seat is most weakly limited.

[0058] Furthermore, the opening of each side wire 11B in the seat front-rear direction between the second crank portion B1 from the front and the third crank portion B1 from the front is restricted to the second degree. Furthermore, the opening of each side wire 11B in the seat front-rear direction between the third crank portion B1 from the front and the fourth crank portion B1 from the front is restricted to the second degree.

[0059] In addition, the fourth crank portion B1 and the fifth crank portion B1 from the front of each side line 11B are connected to each other over the entire area in the seat width direction by each deflection restricting portion 12A, thereby completely restricting the opening between them in the seat front-rear direction. The seat cushion spring 10 is configured by the resin member 12 so that even if the respective shaping lines 11 are formed into shapes symmetrical to each other in the seat width direction, the deflection easiness of each center line 11A and the side line 11B when receiving a load from a seated occupant is different.

[0060] Specifically, if Figure 6 As shown, the seat cushion spring 10 receives a load from the seated occupant, and thus each center line 11A bends relatively softly to sink downward. On the other hand, each side line 11B is restrained from bending so as to be difficult to sink downward compared to each center line 11A.

[0061] Specifically, the bending restriction of each side line 11B is reduced toward the front side where the load applied by the seated occupant becomes smaller, and is increased toward the rear side where the load applied by the seated occupant becomes larger, by the shape of the connection width change of each bending restriction portion 12A. Thus, the roll rigidity of each side portion of the seat cushion 1 can be appropriately improved.

[0062] The cushion support surface 12B constituting the upper surface of each deflection restricting portion 12A functions as a receiving surface of the seat cushion cushion pad 3 when the load of the seated occupant is applied to each side portion of the seat cushion 1. Each cushion pad support surface 12B is integrally provided on each side line 11B of the cushion spring 10 where deflection is restricted, so that stable support can be achieved that is difficult to sink downward.

[0063] In more detail, the cushion support surfaces 12B are integrally connected to each other via the connection portion 12C, so when a load from a seated occupant is applied to one cushion support surface 12B, the load is also transmitted to the side line 11B on the opposite side via the other cushion support surface 12B. Thus, when a load from a seated occupant is applied to each side portion of the seat cushion 1, each cushion support surface 12B can stably receive the load without sinking downward.

[0064] like Figure 5As shown, the grooves formed along the shapes of the side lines 11B on the cushion support surfaces 12B are grooves through which push pins (not shown) pass for fixing the positions of the molded leads 11 in the molding die of the resin member 12 .

[0065] like Figure 7 As shown, the ischium support portion SA formed on each forming line 11 is formed into a shape that is unlikely to cause deviation in ischium support reaction force caused by differences in body shapes of seated passengers. Specifically, the ischium support portion SA is configured so that the entire area R in the seat front-rear direction between the first ischium support portion SA1 that serves as a ischium support portion when the human body model of AM95 is seated and the second ischium support portion SA2 that serves as a ischium support portion when the human body model of JM32 is seated is formed as a coplanar spring surface that is not curved in the seat vertical direction in a side view.

[0066] Here, the AM95 mannequin is a mannequin with a larger body type that matches 95% of American men. On the other hand, the JM32 mannequin is a mannequin with a smaller body type that matches 32% of Japanese men. Therefore, most people have a body type that matches a body type between the AM95 mannequin and the JM32 mannequin.

[0067] The ischium support portion SA has a straight shape extending in a side view with a high front and a low rear in the region R. The portion of the seat cushion cushion pad 3 arranged in the region R of the ischium support portion SA is formed so that the cushion pad thickness is constant in a direction perpendicular to the direction in which the ischium support portion SA extends.

[0068] With such a structure, the cushion spring 10 supports the ischium in such a manner that substantially the same ischium support reaction force acts on the ischium support portion SA when a person having a body shape between the human body model of AM95 and the human body model of JM32 sits on the seat cushion 1. Therefore, it is possible to appropriately suppress the variation in the ischium support reaction force caused by the difference in body shape of the seated occupant.

[0069] Therefore, even if the cushion pad thickness of the seat cushion cushion pad 3 arranged in the above-mentioned area R of the ischium supporting portion SA is thin, the sitting pressure acting on the ischium of the seated occupant can be appropriately dispersed regardless of the body shape. The above-mentioned area R of the ischium supporting portion SA is set as an area remaining in the middle of both ends of the straight line portion extending in a straight line between the bending point of each forming line 11 bent into a V-shape in side view and the rounded end point of the front hook portion 11C.

[0070] More specifically, the cushion spring 10 is mounted on the seat cushion frame 2 in such a manner that the spring surface of the ischium supporting portion SA has an angle θ of approximately 20 degrees with respect to the rail length direction in which the slide rail 5 extends. The cushion spring 10 can appropriately suppress the forward sliding of the buttocks of the seated occupant by the angle θ.

[0071] As in Figure 5 As described above, the center line 11A and the side line 11B of each shaping line 11 are arranged at a position offset in the seat width direction from a position corresponding to right below the left and right ischial bones (not shown) of the seated occupant. More specifically, the center line 11A and the side line 11B of each shaping line 11 are arranged offset in the seat width direction from positions corresponding to right below the ischial bones when the AM95 human body model is seated and right below the ischial bones when the JM32 human body model is seated.

[0072] According to the above configuration, the seating pressure acting on the ischial bones of the seated occupant can be appropriately dispersed regardless of the body shape.

[0073] In summary, the seat cushion spring 10 of the present embodiment has the following structure. In addition, the reference numerals in parentheses below are reference numerals corresponding to the respective structures shown in the above-mentioned embodiment.

[0074] That is, the seat cushion spring (10) is a spring which is mounted on the seat cushion frame 2 in the front-rear direction of the seat and bears the load of the seated occupant on the surface. The seat cushion spring (10) has a forming line (11) which is mounted on the seat cushion frame (2) in the front-rear direction of the seat. The forming line (11) has a ischium support portion (SA) which supports the ischium of the seated occupant via the seat cushion cushion pad (3).

[0075] The ischium support portion (SA) forms a coplanar spring surface without curvature in the seat up-down direction in the entire area (R) in the seat front-rear direction between the first ischium support portion (SA1) which serves as a support portion for the ischium when the human body model of AM95 is seated and the second ischium support portion (SA2) which serves as a support portion for the ischium when the human body model of JM32 is seated.

[0076] Thus, by making the ischial support portion (SA) of the shaping line (11) have a shape having a coplanar spring surface in the region (R), it is possible to appropriately suppress the variation in ischial support reaction force caused by differences in body shapes of seated occupants.

[0077] In addition, the forming line (11) is provided with a plurality of line portions (11A, 11B) in the seat width direction and spanned on the seat cushion frame (2) in the seat front-rear direction. The plurality of line portions (11A, 11B) are arranged to deviate in the seat width direction from directly below the ischium when the AM95 human body model is seated and directly below the ischium when the JM32 human body model is seated.

[0078] According to the above structure, even if the cushion thickness of the seat cushion cushion (3) arranged in the area (R) becomes thinner due to the coplanar spring surface formed by the ischium support portion (SA) of the forming line (11), the seating pressure dispersion can be appropriately improved.

[0079] In addition, the forming wire (11) is mounted on the seat cushion frame (2) in such a manner that the spring surface is higher in the front and lower in the rear relative to the track length direction of the slide rail (5) to form an angle (θ), and the slide rail (5) connects the seat cushion frame (2) to the floor in such a manner that the seat cushion frame (2) can slide relative to the floor in the seat front-rear direction. According to the above structure, the seat cushion spring (10) can be set to suppress the forward sliding of the buttocks of the seated occupant.

[0080] 《Regarding other implementation methods》

[0081] As mentioned above, although the embodiment of the present invention was described using one embodiment, the present invention can be implemented in various forms other than the above-described embodiment.

[0082] 1. The seat cushion spring of the present invention can be applied to seat cushions of seats mounted on vehicles such as automobiles and railways, and can also be applied to seat cushions of seats mounted on vehicles other than vehicles such as airplanes and ships. In addition, the seat cushion spring can also be applied to seat cushions of seats other than vehicles.

[0083] 2. The seat cushion springs do not necessarily need to be provided in a pair so that the forming lines are symmetrical with respect to the seat cushion frame in the seat width direction. That is, one forming line may be formed in a shape different from the other forming line. In addition, the forming line does not necessarily need to be formed in a shape in which the center line and the side line constituting the line portion are symmetrical with each other in the seat width direction.

[0084] 3. For the ischium support portion, the area in the front-rear direction of the seat between the first ischium support portion that supports the ischium when the AM95 human body model is seated and the second ischium support portion that supports the ischium when the JM32 human body model is seated may be set as a coplanar spring surface without bending in the seat vertical direction. Therefore, the ischium support portion may be formed over the above area to form a coplanar spring surface without bending in the seat vertical direction.

[0085] In addition, the shaping line need not be installed on the seat cushion frame in such a manner that the spring surface of the ischium support portion forms an angle that is higher in the front and lower in the rear, but the spring surface of the ischium support portion may be formed parallel to the rail length direction of the slide rail. In addition, the shaping line may be a structure in which the line portion is arranged at a position corresponding to the position directly below the ischium when the AM95 human body model is seated and / or the position directly below the ischium when the JM32 human body model is seated.

[0086] Description of Reference Numerals

[0087] 1 Seat Cushion

[0088] 2 Seat cushion frame

[0089] 2A Lower arm

[0090] 2B front pipe

[0091] 2C rear pipe

[0092] 2D front panel

[0093] 3 Seat cushion cushion

[0094] 4 Seat cushion cover

[0095] 5 Slide rails

[0096] 10 Seat spring

[0097] SA Sciatica Support

[0098] SA1 First Sciatic Support Area

[0099] SA2 Second Sciatic Support Site

[0100] 11 Forming line

[0101] 11A Central Line (Line)

[0102] A1 Crank

[0103] 11B Side line (line part)

[0104] B1 Crank

[0105] B2 vertical line

[0106] 11C Front hook

[0107] 11D rear hook

[0108] 12 Resin parts

[0109] 12A Deflection limiting section

[0110] A2 Expansion

[0111] 12B cushion support surface

[0112] 12C Connection

[0113] θ Angle

[0114] R Region

Claims

1. A seat cushion spring, mounted on a seat cushion frame in the front-rear direction of a seat, to bear the load of a seated occupant on its surface, wherein: The seat cushion spring has a forming line spanning the seat cushion frame in the front-rear direction of the seat, The shaped wire has a ischium supporting portion for supporting the ischium of the seated occupant via the seat cushion cushion pad, The ischium supporting portion forms a coplanar spring surface without curvature in the seat up-down direction in the entire area in the seat front-to-back direction between the first ischium supporting portion and the second ischium supporting portion, the first ischium supporting portion being a support portion for the ischium when the human body model of AM95 is seated, and the second ischium supporting portion being a support portion for the ischium when the human body model of JM32 is seated.

2. The seat spring according to claim 1, wherein: The shaping wire includes a plurality of wire portions in the seat width direction, and the wire portions are spanned on the seat cushion frame in the seat front-rear direction. The plurality of line portions are arranged to be offset in the seat width direction from directly below the ischium when the AM95 human body model is seated and directly below the ischium when the JM32 human body model is seated.

3. The seat spring according to claim 1 or 2, wherein: The forming wire is mounted on the seat cushion frame in such a manner that the spring surface is angled with respect to the track length direction of the slide rail so as to be higher in the front and lower in the rear. The slide rail connects the seat cushion frame to the floor in such a manner that the seat cushion frame can slide in the seat front-rear direction relative to the floor.

4. A seat comprising the seat cushion spring according to any one of claims 1 to 3, wherein: The seat includes a seat cushion cushion pad, the seat cushion cushion pad being provided so as to cover the entire upper region of the seat cushion frame from above the seat. The seat cushion cushion pad has a constant thickness in a portion of the seat cushion cushion pad that is arranged in a region in a front-rear direction of the seat.

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