Seat cushion

Abstract

Provided is a seat cushion in which a main cushion plate having a structure separated from each side cushion plate can be easily attached to and detached from a seat frame. In a seat cushion (1), a cushion body that elastically supports a seated person is configured from three divided elements, i.e., a main cushion plate (2A) that constitutes a central portion in the seat width direction, and side cushion plates (2B) that constitute two side portions in the seat width direction. Between a main base material (A3) attached to the cushion back surface of the main cushion plate (2A) and a side base material (B3) attached to the cushion back surface of each side cushion plate (2B) are formed: first fitting parts (F1) which are fitted to each other in the seat height direction by insertion of the main base material (A3) from the seat upper direction; and a second fitting part (F2) that engages the main base material (A3) from the front of the seat so as not to move toward the upper side of the seat with respect to each of the side base materials (B3).

Description

Technical Field

[0001] The present invention relates to a seat cushion, and more particularly to a seat cushion having a cushion body that elastically supports a seated person and a seat frame that supports the cushion body from a seat back side. Background Art

[0002] Patent Document 1 discloses a seat cushion in which a seat cushion body, consisting of a seat pad and a seat cover surrounding the seat pad, is divided into three sections in the seat width direction. Specifically, the seat cushion body is divided into a main pad forming a central portion in the seat width direction and side pads forming two side portions in the seat width direction. The main pad and each side pad are independently fixed to the seat frame.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-33005. Summary of the Invention Problems to be solved by the invention

[0004] In the structure described in Patent Document 1, the main pad and each side pad are bolted to the seat frame from the seat back. Therefore, to remove the main pad from the seat frame, the seat cushion must be removed from the vehicle, which is inefficient. Therefore, the present invention provides a seat cushion that allows for easy attachment and detachment of a main pad, which is detachable from each side pad, from the seat frame. Means for solving problems

[0005] As a means for solving the above-mentioned problems, the seat cushion of the present invention adopts the following means.

[0006] The foldable seat frame is constructed by folding the seat covers around the base and around the base to allow the seat to rest on the floor, and the foldable seat frame has two opposite sides that are adapted to accommodate the user's seated posture.

[0007] According to the first technical solution, simply by inserting the main backing plate into the side backing plates from above the seat, the main backing plate can be installed in a manner that prevents it from easily falling off during use. Specifically, through this insertion, the main base material can be engaged with the side backing plates in the direction of seat height via the first engaging portion, and the main backing plate can be engaged with the side backing plates via the second engaging portion so as to prevent it from falling off above the seat. By pulling the main base material toward the front of the seat, the snap-fitting state of the second engaging portion can be released, allowing the main backing plate to be released from the seat and disengaged above the seat. Therefore, the main backing plate, which is separated from the side backing plates, can be easily assembled and disassembled from the seat frame.

[0008] The second technical solution of the present invention is that in the seat cushion of the above-mentioned first technical solution, the first fitting portion and the second fitting portion are formed between the main side fitting portion formed on the main base material and the side side fitting portion formed on each of the side base materials, and each of the side side fitting portions protrudes from each of the side base materials in a manner that passes over the dividing line between the main pad and each of the side pads inward in the seat width direction, and fits into the main side fitting portion directly below the main pad.

[0009] According to the second technical solution, after the side panels are assembled to the seat frame, the main panel can be easily installed between them by pressing them in from above the seat. In addition, only the main panel can be easily removed from the seat frame without removing the side panels from the seat frame.

[0010] The third technical solution of the present invention is that in the seat cushion of the above-mentioned second technical solution, the first interlocking portion is a concave-convex interlocking structure, and the concave-convex interlocking structure is composed of a convex portion formed on the main base material and protruding below the seat and a concave portion formed on each of the side base materials and opening above the seat, and the second interlocking portion is a claw interlocking structure, and the claw interlocking structure is composed of an interlocking hole formed on the main base material and passing through the front-to-rear direction of the seat and an interlocking claw formed on each of the side base materials and protruding in front of the seat.

[0011] According to the third aspect, the first fitting portion and the second fitting portion can be formed relatively simply between the main base material and each side base material.

[0012] According to a fourth technical solution of the present invention, in any one of the seat cushions of the first to third technical solutions, the main base material further has a frame hook, and the frame hook is snap-fitted with the seat frame from the front of the seat through the insertion in a manner that it cannot move upward from the seat.

[0013] According to the fourth technical solution, the main backing plate can be attached to the seat frame simply by inserting it from above the seat, preventing it from easily falling out during use. Furthermore, by pulling the main base material forward of the seat in the same manner as for releasing the engagement of the second engagement portion, the engagement with the seat frame can be released, allowing the main backing plate to be released upward from the seat. This allows for easy attachment and detachment of the main backing plate from the seat frame.

[0014] The fifth technical solution of the present invention is that in any one of the seat cushions in the first to third technical solutions mentioned above, the seat frame has: a pair of lower arms in the seat width direction, supporting the seat rear part of the seat cushion body from the seat back side; and a tilt frame, connected between the pair of the lower arms in a manner that can be adjusted in the seat height direction around a tilt axis extending along the seat width direction, and supporting the seat front part of the seat cushion body from the seat back side, and each of the side substrates is fixed to the tilt frame.

[0015] According to the fifth aspect, the main pad and each side pad can be attached to the seat frame including the tilt frame so as to appropriately follow the tilting movement.

[0016] The sixth technical solution of the present invention is the seat cushion of the fifth technical solution, wherein the main base material comprises: a front portion of the base material, extending in an inverted U shape when viewed from above along the upper surface of a pair of inclined arms in the seat width direction connected to the pair of lower arms of the inclined frame and the inclined plate extending in the seat width direction between the front portions of the pair of inclined arms; a rear portion of the base material, extending in a U shape when viewed from above along the upper surface of the rear tube extending in the seat width direction between the pair of lower arms and the rear portions of the pair of lower arms; and a flexible portion, connecting the two end portions of the inverted U shape of the front portion of the base material relative to the two end portions of the U shape of the rear portion of the base material in a manner that follows the movement of the inclined frame by bending.

[0017] According to the sixth aspect, even if the main base material is provided in a shape that is continuously connected to the seat frame that tilts, such that it spans the movable portion and the fixed portion, in a top view, it can still appropriately follow the tilting movement. Therefore, the main base material can be constructed from a single component without being divided, which can significantly reduce the number of components and the number of assembly steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a perspective view showing a schematic structure of a seat cushion according to the first embodiment. Figure 2 This is an exploded perspective view of the seat cushion. Figure 3 It is a perspective view showing a state where each side bolster is attached to the seat cushion frame. Figure 4 It is a bottom view of the cushion body. Figure 5 yes Figure 3 Top view of . Figure 6 Is represented by the main base material only Figure 3 A three-dimensional view of the main pad. Figure 7 It is a perspective view showing a state in which the main base material, the seat cushion frame, and each side base material are fitted together. Figure 8 Cut in vertical plane Figure 7 A sectional view of part VIII. Figure 9 yes Figure 6 IX direction view. Figure 10 Cut in vertical plane Figure 7 A cross-sectional view of the X portion. Figure 11 yes Figure 7 Top view of . Figure 12 The main structure of the seat cushion according to the second embodiment is shown. Figure 8 Corresponding cross-sectional view. DETAILED DESCRIPTION

[0019] Hereinafter, embodiments of the present invention will be described using the accompanying drawings.

[0020] First Implementation Method (Schematic Structure of Seat Cushion 1) First, use Figures 1 to 11 The structure of the seat cushion 1 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.

[0021] In addition, when "seat" is marked in each direction such as "seat width direction", it means each direction based on the seat cushion 1. In the following description, if there is no specific reference figure or there is no corresponding symbol in the reference figure, it is appropriately referred to. Figures 1 to 11 Any one of the graphs.

[0022] like Figure 1 As shown in FIG. 1 , the seat cushion 1 of this embodiment is configured as a seating portion of a vehicle seat. Figure 2 As shown, the seat cushion 1 includes a cushion body 2 that elastically supports the buttocks of a seated person and a cushion frame 3 that supports the cushion body 2 from a seat back side (lower side).

[0023] The seat cushion body 2 is divided into three components: a main pad 2A forming the center portion in the seat width direction, and side pads 2B forming the two side portions in the seat width direction. The seat cushion frame 3 is composed of metal components assembled into a frame-like shape when viewed from above. Here, the seat cushion frame 3 corresponds to the "seat frame" of the present invention.

[0024] The seat cushion body 2 is divided into the main pad 2A and the side pads 2B as described above, so that each divided element can be replaced according to the specifications. The main pad 2A and the side pads 2B are simply assembled to the seat cushion frame 3 by simply entering from above the seat.

[0025] like Figure 3 As shown, specifically, each side bolster 2B is integrally fixed to the seat cushion frame 3 by fastening with bolts (not shown). On the other hand, the main bolster 2A is inserted between the side bolsters 2B from above the seat after the side bolsters 2B are assembled to the seat cushion frame 3, thereby snap-fitting with the side bolsters and fixing their positions.

[0026] More specifically, the main pad 2A is inserted into and engaged with both the side pads 2B and the seat cushion frame 3. As a result, the main pad 2A is assembled with respect to the side pads 2B and the seat cushion frame 3 so as to be restricted from falling off toward the upper side of the seat ( Figure 1 assembled state shown).

[0027] The main pad 2A is fitted to the side pads 2B and the cushion frame 3 (see Figure 1 ) The operator simply places his hand on the front of the main pad 2A from below and pulls it forward of the seat to release it. Pulling the front of the main pad 2A forward of the seat is different from removing the main pad 2A from above the seat.

[0028] Therefore, the main pad 2A can be mounted on the seat cushion frame 3 so as not to fall off easily during use. Furthermore, anyone who knows how to remove and install the main pad 2A can easily remove and reinstall the main pad 2A.

[0029] (Structure of the Cushion Frame 3) The following describes the specific structure of each part of the seat cushion 1 in more detail. First, the structure of the cushion frame 3 is described. Figure 2 As shown, the cushion frame 3 includes a pair of left and right long plate-shaped lower arms 3A extending in the seat front-rear direction along the left and right side portions of the seat cushion 1 .

[0030] The seat cushion frame 3 has an inclined frame 3B connected between the front portions of the lower arms 3A so as to extend in the seat width direction. The seat cushion frame 3 has a rear pipe 3C connected between the rear portions of the lower arms 3A so as to extend in the seat width direction.

[0031] The tilt frame 3B is rotatably connected to each lower arm 3A via a tilt shaft B7 extending in the seat width direction. Specifically, the tilt frame 3B is formed into an inverted U-shaped shape when viewed from above, comprising a pair of left and right tilt arms B8 extending in the seat front-to-back direction along each lower arm 3A, and a tilt plate B9 integrally provided between the front portions of each tilt arm B8.

[0032] Each tilt arm B8 is composed of a plate member with an L-shaped cross section that extends in the seat front-to-rear direction along the inner and upper sides of each lower arm 3A. The rear end of each tilt arm B8 is connected to each lower arm 3A via a tilt shaft B7 so that they can rotate about the same axis. The tilt plate B9 is composed of a plate-shaped member that extends horizontally.

[0033] The tilt frame 3B is driven by a driving force transmitted from a drive unit (not shown) connected between the lower arms 3A. Specifically, the tilt frame 3B receives driving force from the drive unit, thereby rotating about each tilt axis B7, thereby adjusting its position in the seat height direction relative to each lower arm 3A.

[0034] The seat cushion frame 3 supports the seat rear portion of the seat cushion body 2 at a fixed position from the seat back side (lower side) via the aforementioned lower arms 3A and rear tube 3C. Furthermore, the seat cushion frame 3 supports the seat front portion of the seat cushion body 2 from the seat back side (lower side) via the aforementioned tilt frame 3B so that the position thereof can be adjusted in the seat height direction.

[0035] (Structure of Cushion Body 2) Next, the structure of the main pad 2A and the side pads 2B constituting the seat cushion body 2 will be described. Figure 4 As shown, the main pad 2A includes a main pad A1 made of foamed polyurethane, a main cover A2 made of fabric covering the main pad A1, and a main base material A3 made of resin abutting against the main pad A1 from the pad back side.

[0036] The main cover A2 covers the main pad A1 from the front side. The front, rear, left, and right cover tips of the main cover A2 are pulled into the back side of the main pad A1. Furthermore, the cover tips of the main cover A2 are fixed to the peripheral edges of the main base material A3, which abuts the back side of the main pad A1.

[0037] Thus, the main cover A2 is integrated with the main base material A3 so as to enclose the main gasket A1 between the main cover A2 and the main base material A3. As a result, the main base material A3 is fixed in a state where the main cover A2 contacts the gasket back surface of the main gasket A1.

[0038] Each side lining 2B similarly includes a side pad B1 made of foamed polyurethane, a fabric side cover B2 covering the side pad B1, and a resin side base material B3 abutting against the side pad B1 from the pad back side.

[0039] Each side cover B2 covers the side pad B1 from the front side. The front, rear, left, and right cover tips of each side cover B2 are pulled into the back side of the side pad B1. Furthermore, the cover tips of each side cover B2 are fixed to the peripheral edges of the side base material B3, which abuts the back side of the side pad B1.

[0040] Thus, each side cover B2 is integrated with the side base B3 so as to wrap the side pad B1 between the side cover B2 and the side base B3. As a result, each side base B3 is fixed in a state of contact with the pad back surface of the side pad B1 via the side cover B2.

[0041] like Figure 2 As shown, the main pad 2A and each side pad 2B are individually assembled to the seat cushion frame 3 by accessing from above the seat. Specifically, first, each side pad 2B is assembled to the seat cushion frame 3. The steps are as follows.

[0042] First, the side base materials B3 of each side pad 2B are clamped and fitted onto the left and right sides of each tilt frame 3B from above the seat. Thus, each side base material B3 is placed so as to straddle the left and right sides of each tilt frame 3B and each lower arm 3A, contacting the seat from above.

[0043] Next, each side base material B3 is bolted to the portion extending inward and downward from each inclined arm B8. Figure 3 and Figure 5 As shown, each side bolster 2B is integrally fixed to the tilt frame 3B and is provided in a state of being supported from the seat back side by the tilt frame 3B and each lower arm 3A.

[0044] After the above assembly, the main pad 2A is then assembled to the cushion frame 3. The steps are as follows. Figure 6 As shown, first, the main base material A3 of the main pad 2A is inserted between the side pads 2B assembled on the seat cushion frame 3 from above the seat. Figure 6 This is a schematic diagram showing the main backing plate 2A by only the main base material A3.

[0045] Then, the rear portion 32 of the main base material A3 is dropped between the side bolsters 2B, and the plurality of hooks 34 formed along its rear edge are engaged with the rear tube 3C so as to sandwich it from the front of the seat. This positions the rear portion 32 of the main base material A3 relative to the seat cushion frame 3.

[0046] Next, the front portion 31 of the main substrate A3 is dropped onto the tilt frame 3B with the rear tube 3C fitted as a fulcrum. Figure 7 As shown, the main side fitting portions A4 (see Figure 8 ) is engaged with the side engaging portion B4 protruding inward in the seat width direction from the front end portion of each side base material B3.

[0047] like Figure 5 As shown, each side fitting portion B4 protrudes from each side base material B3 to the inner side in the seat width direction, crossing the dividing line L between the main pad 2A and each side pad 2B. Figure 6 ) is engaged with the main side engaging portion A4 directly below.

[0048] like Figure 7 As shown, in addition to the above-mentioned interlocking, the frame hooks A7 (see Figure 10 ) from the front of the seat and the lower edge of the front end of the inclined plate B9 snap fit. Through these fittings, the main base material A3 is installed relative to each side base material B3 and the seat cushion frame 3 so as not to fall off above the seat.

[0049] Specifically, if Figure 8 As shown, a first fitting portion F1 is formed between each main-side fitting portion A4 and each side fitting portion B4, allowing the main base material A3 to be inserted from above the seat, thereby fitting together in the seat height direction. Furthermore, a second fitting portion F2 is formed between each main-side fitting portion A4 and each side fitting portion B4. This second fitting portion F2 engages from the front of the seat, preventing the main base material A3 from moving upward relative to the side base materials B3 when the main base material A3 is inserted from above.

[0050] The first fitting portion F1 is formed by a concave-convex fitting structure formed by a convex portion A5 protruding downward from the seat formed on each main side fitting portion A4 (see Figure 9) and a recessed portion B5 formed in each side fitting portion B4, opening upward from the seat. Each protrusion A5 is formed as a round rod-like protrusion from the bottom surface of the base front portion 31 of the main base material A3 toward the bottom of the seat. The second fitting portion F2 is formed by a claw-fitting structure consisting of a rectangular hole-shaped fitting aperture A6 formed in each main side fitting portion A4, extending longitudinally through the seat, and a fitting claw B6 formed in each side fitting portion B4, protruding toward the front of the seat. The fitting aperture A6 is formed in a portion of the main base material A3 that extends downward from the front edge of the base front portion 31 toward the bottom of the seat.

[0051] As the first fitting portion F1 is inserted from above the seat by the main base material A3, the protrusion A5 enters the recess B5 from above the seat before the fitting claws B6 of the second fitting portion F2 engage with the fitting hole A6. Furthermore, as this insertion occurs, the main-side fitting portions A4 abut against the fitting claws B6 and flex forward.

[0052] After the protrusion A5 enters the recess B5, the main base material A3 is further inserted downwardly from the seat, aligning the mating hole A6 with the front side of the mating claw B6. As the main-side mating portion A4 deforms, the mating hole A6 snaps into engagement with the mating claw B6 from the front of the seat. The mating claw B6 is formed to project forwardly toward the seat in a right-angled triangle shape when viewed from the side.

[0053] More specifically, the engaging claw B6 is formed into a right-angled triangular protrusion. Its bottom surface, which abuts the lower edge of the engaging hole A6, is a flat surface that faces straight downward from the seat, while its upper surface is an inclined surface that slopes downward, lower in front and higher in the back. Therefore, the lower edge of the engaging hole A6 abuts the bottom surface of the engaging claw B6 through a snap-fit engagement, thereby restricting the main-side engaging portion A4 from moving upward from the seat relative to the side-side engaging portion B4.

[0054] As a result, the main substrate A3 is assembled to each side substrate B3 in a state where it is restricted from falling out toward the upper side of the seat. This engagement of the main substrate A3 with the side substrates B3 can be released by an operator placing a hand from below at a portion extending downward from the front edge of the substrate front portion 31 of the main substrate A3 toward the lower side of the seat and pulling each main side engagement portion A4 toward the front of the seat.

[0055] Specifically, by pulling each main-side fitting portion A4 toward the front of the seat from the aforementioned engaged state, the fitting holes A6 of each main-side fitting portion A4 disengage from the respective fitting claws B6 toward the front of the seat. This disengages each main-side fitting portion A4 from its snap-fit engagement with the side fitting portion B4, allowing it to be moved upward toward the seat. Consequently, by moving the main base material A3 upward from this position, the main base material A3 can be removed from each side base material B3 toward the top of the seat.

[0056] In addition, in fact, the main base material A3 is inserted from above the seat relative to each side base material B3, as shown in Figure 7 As mentioned above, the frame hooks A7 formed at the left and right sides of the front end are engaged with the lower edge of the front end of the tilt plate B9 from the front of the seat (see Figure 10 ).

[0057] This snap-fit connection is similar to the snap-fit connection at the left and right ends described above. The operator can release it by placing their hand from below on the portion of the main substrate A3 that extends downward from the front edge of the substrate front portion 31 and pulling it forward toward the seat. Thus, by releasing these connections and moving the main substrate A3 upward, the main substrate A3 can be removed from the side substrates B3 and the seat cushion frame 3 upward toward the seat.

[0058] like Figure 6 and Figure 11 As shown, the main base material A3 is formed into a frame-like shape when viewed from above, extending along the seat cushion frame 3 assembled into a frame-like shape when viewed from above. Specifically, the main base material A3 has a base material front portion 31 extending in an inverted U-shape when viewed from above, along the upper surface of the inclined plate B9 and the inner side of the front area of each lower arm 3. The base material front portion 31 is formed in a shape such that its front edge hangs down from the front of the seat to cover the inclined plate B9 and to the bottom of the seat (see FIG. Figure 6 ).

[0059] The main base material A3 also includes a base material rear portion 32 that extends in a U-shape when viewed from above, along the inner side of the rear region of each lower arm 3A and the upper surface of the rear tube 3C. The main base material A3 also includes a corrugated flexible portion 33 that flexibly connects the opposite ends of the inverted U-shape of the base material front portion 31 to the opposite ends of the U-shape of the base material rear portion 32.

[0060] The flexible portion 33 is formed into a bellows structure that connects the ends of the base material front portion 31 to the ends of the base material rear portion 32 by flexing so as to follow the movement of the reclining frame 3B. This structure allows the main base material A3 to appropriately follow the movement of the reclining frame 3B even when its entire circumference is supported by the seat cushion frame 3 from the seat back side (underside).

[0061] Therefore, the main base material A3 can be arranged to support the main pad A1 from the pad back side. In addition, the main base material A3 can be formed from a single component instead of being divided into the base material front portion 31 and the base material rear portion 32, which can significantly reduce the number of parts and assembly man-hours.

[0062] In summary, the seat cushion 1 according to the present embodiment is configured as follows: In the following, the reference numerals in parentheses correspond to the respective configurations shown in the above-described embodiment.

[0063] That is, a seat cushion (1) includes a cushion body (2) that elastically supports a seated person and a seat frame (3) that supports the cushion body (2) from the back of the seat. The cushion body (2) is composed of three divided elements: a main pad (2A) that constitutes a central portion in the seat width direction and side pads (2B) that constitute two side portions in the seat width direction. The main pad (2A) includes a main pad (A1) that constitutes a seat cushion and a main base material (A3) that is attached to the back of the pad of the main pad (A1).

[0064] Each side pad (2B) includes a side pad (B1) constituting a seat pad and a side base material (B3) mounted on the back of the pad of the side pad (B1) and fixed to the seat frame (3). A first fitting portion (F1) and a second fitting portion (F2) are formed between the main base material (A3) and each side base material (B3). The first fitting portion (F1) is engaged with each other in the seat height direction by inserting the main base material (A3) from above the seat. The second fitting portion (F2) is engaged with the main base material (A3) relative to each side base material (B3) from the front of the seat so that the main base material (A3) cannot move upwards toward the seat.

[0065] According to the above structure, the main pad (2A) can be installed in a manner that will not easily fall off during use simply by inserting the main pad (2A) into each side pad (2B) from above the seat. Specifically, through the above insertion, the main base material (A3) can be engaged with each side base material (B3) in the seat height direction through the first engaging portion (F1), and engaged with the second engaging portion (F2) in a manner that will not fall off above the seat. The main pad (2A) can be released from the snap-fitting state of the second engaging portion (F2) by pulling the main base material (A3) toward the front of the seat, thereby becoming a state detached from the seat. Therefore, the main pad (2A) having a structure separated from each side pad (2B) can be easily detached from the seat frame (3).

[0066] Furthermore, the first fitting portion (F1) and the second fitting portion (F2) are formed between a main side fitting portion (A4) formed on the main base material (A3) and a side fitting portion (B4) formed on each side base material (B3). Each side fitting portion (B4) protrudes from each side base material (B3) inward in the seat width direction, crossing a dividing line (L) between the main pad (2A) and each side pad (2B), and fits into the main side fitting portion (A4) directly below the main pad (2A).

[0067] According to the above structure, after the side pads (2B) are assembled to the seat frame (3), the main pad (2A) can be easily installed between them by pressing them in from above the seat. In addition, it is not necessary to remove the side pads (2B) from the seat frame (3), and only the main pad (2A) can be easily removed from the seat frame (3).

[0068] The first engaging portion (F1) has a concave-convex engaging structure, which is composed of a convex portion (A5) formed on the main base material (A3) and protruding toward the bottom of the seat, and a concave portion (B5) formed on each side base material (B3) and opening toward the top of the seat. The second engaging portion (F2) has a claw engaging structure, which is composed of an engaging hole (A6) formed in the main base material (A3) and extending through the seat in the front-to-rear direction, and an engaging claw (B6) formed on each side base material (B3) and protruding toward the front of the seat. With this structure, the first engaging portion (F1) and the second engaging portion (F2) can be relatively simply formed between the main base material (A3) and each side base material (B3).

[0069] In addition, the main base material (A3) also has a frame hook (A7), and the frame hook (A7) is snap-fitted with the seat frame (3) from the front of the seat by the above insertion in a manner that cannot move upward from the seat. According to the above structure, by simply inserting the main pad (2A) into the seat frame (3) from above the seat, it can be installed in a manner that will not easily fall off during use. In addition, by pulling the main base material (A3) toward the front of the seat in the same manner as the operation of releasing the engaging state of the second engaging portion (F2), the engaging state of the main pad (2A) and the seat frame (3) can be released and the main pad (2A) can be put into a state of being detached from the seat. Therefore, the main pad (2A) can be easily detached from the seat frame (3).

[0070] In addition, the seat frame (3) includes: a pair of lower arms (3A) in the seat width direction, which support the seat rear portion of the seat cushion body (2) from the seat back side; and a tilt frame (3B) connected between the pair of lower arms (3A) in a manner that allows position adjustment in the seat height direction around a tilt axis (B7) extending in the seat width direction, which supports the seat front portion of the seat cushion body (2) from the seat back side. Each side base material (B3) is fixed to the tilt frame (3B). According to the above structure, the main pad (2A) and each side pad (2B) can be installed on the seat frame (3) having the tilt frame (3B) in a manner that appropriately follows the tilting movement.

[0071] The main base material (A3) includes a base material front portion (31) extending in an inverted U-shape when viewed from above along the upper surface of a pair of tilting arms (B8) in the seat width direction connected to the pair of lower arms (3A) of the tilting frame (3B) and a tilting plate (B9) extending in the seat width direction between the front portions of the pair of tilting arms. The main base material (A3) includes a base material rear portion (32) extending in a U-shape when viewed from above along the upper surface of the pair of lower arms (3A) and a rear tube (3C) extending in the seat width direction between the rear portions of the pair of lower arms.

[0072] In addition, the main base material (A3) has a flexible portion (33) that connects the two ends of the inverted U-shape of the base material front portion (31) relative to the two ends of the U-shape of the base material rear portion (32) in a manner that follows the movement of the tilt frame (3B) by bending. According to the above structure, even if the main base material (A3) is set in a shape that is continuously connected in a frame shape when viewed from above across the movable portion and the fixed portion relative to the seat frame (3) that performs a tilting movement, it can appropriately follow the tilting movement. Therefore, the main base material (A3) can be composed of a single component without being divided, and the number of components and the number of assembly steps can be appropriately reduced.

[0073] Second Implementation Method Next, use Figure 12 The structure of the seat cushion 1 according to the second embodiment will be described. In this embodiment, the first fitting portion F1 in which the main-side fitting portions A4 and the side-side fitting portions B4 fit together in the seat height direction by inserting the main base material A3 from above the seat is configured as follows.

[0074] That is, instead of the convex portion A5 (see Figure 8 and Figure 9 ), the first fitting portion F1 is formed by a concave-convex fitting structure formed by a clip CL attached to each main-side fitting portion A4 and a through-hole H formed in each side fitting portion B4 and opening upward toward the seat. Here, each clip CL corresponds to a "convex portion" in the present invention. Furthermore, each through-hole H corresponds to a "concave portion" in the present invention.

[0075] Each clip CL is composed of a metal leaf spring, projecting from the bottom surface of the front portion 31 of the main base material A3 toward the underside of the seat in an inverted Ω shape when viewed from the side. As the main base material A3 is inserted from above the seat, each clip CL is elastically deformed and pressed into the through-hole H formed in each side fitting portion B4.

[0076] Specifically, as the main base material A3 is inserted, each clip CL is inserted into the through-hole H so that its front and rear Ω-shaped protrusions are compressed. Each clip CL is inserted into the through-hole H until the Ω-shaped protrusions extend beyond the through-hole H toward the bottom of the seat.

[0077] As a result, each clip CL is snap-fitted to the lower edge of each through-hole H, making it difficult for it to fall out of the seat upwards, as its bulge returns to its original position beyond the through-hole H. More specifically, each clip CL is snap-fitted to the lower edge of each through-hole H, with the two upper inclined surfaces at the base of its bulge obliquely abutting from below against the lower edge of each through-hole H. This engagement ensures that the main base material A3 is securely fastened to the side base materials B3 in a manner that prevents it from moving in the seat height direction.

[0078] The elastic force exerted by each clip CL on each through-hole H is set to a strength sufficient to allow for easy removal by an operator pulling the main substrate A3 upward from the seat. This facilitates installation and removal. The remaining configuration is identical to that described in the first embodiment and, therefore, is denoted by the same reference numerals and any further explanation will be omitted.

[0079] Regarding Other Implementation Methods As mentioned above, although embodiment of the present invention was demonstrated using two embodiments, this invention can be implemented in various forms other than the above-mentioned embodiment.

[0080] 1. The seat cushion of the present invention can also be used for seats in vehicles other than automobiles, such as railways, airplanes, and ships. Furthermore, the seat cushion can also be used for seats in various non-vehicle facilities, including sports facilities, theaters, concert halls, and event venues.

[0081] 2. The second engaging portion may also be constructed by forming engaging claws on the main base material that project toward the rear of the seat, and forming engaging holes on each side base material that support the engaging claws from the front of the seat. Alternatively, the second engaging portion may be constructed by interlocking engaging claws.

[0082] 3. The seat frame may not include a tilt frame, but may instead support the seat cushion body at a fixed position from the seat back (underside). The main cover and / or side covers may be made of leather, in addition to fabric. The main base material and / or side base materials may be made of metal, in addition to resin. The main base material may be attached to the back of the main cushion by bonding or integral molding. The side base materials may also be attached to the back of the side cushion by bonding or integral molding.

[0083] 4. The main substrate may also be constructed from two separate components, the front and rear portions. Furthermore, if the main substrate includes a flexible portion that connects the front and rear portions in a manner that follows the movement of the tilt frame, the flexible portion may be configured as an integral hinge, in addition to being corrugated. Alternatively, the flexible portion may be connected by inserting another component, such as a leaf spring, between the front and rear portions. Description of Reference Numerals

[0084] 1 seat cushion

[0085] 2. Seat cushion body

[0086] 2A main pad

[0087] A1 Main Pad

[0088] A2 main cover

[0089] A3 main substrate

[0090] 31 base material front

[0091] 32 rear of substrate

[0092] 33 Flexible part

[0093] 34 hook

[0094] A4 main side fitting part

[0095] A5 convex part

[0096] A6 fitting hole

[0097] A7 frame hook

[0098] 2B side pad

[0099] B1 side pads

[0100] B2 side shield

[0101] B3 side substrate

[0102] B4 side fitting part

[0103] B5 concave part

[0104] B6 chimeric claw

[0105] 3 cushion frame (seat frame)

[0106] 3A lower arm

[0107] 3B tilt frame

[0108] B7 tilt axis

[0109] B8 Tilt Arm

[0110] B9 tilt panel

[0111] 3C rear tube

[0112] F1 first fitting part

[0113] F2 second fitting part

[0114] L dividing line

[0115] CL clip (convex part)

[0116] H through hole (recess).

Claims

1. A seat cushion comprising a cushion body for elastically supporting a seated person and a seat frame for supporting the cushion body from a seat back side. The seat cushion body is composed of three divided elements: a main pad forming the central portion in the seat width direction and side pads forming the two side portions in the seat width direction. The main pad includes a main pad constituting a seat pad and a main base material attached to the back surface of the main pad. Each of the side pads includes a side pad constituting a seat pad and a side base material mounted on a pad back surface of the side pad and fixed to the seat frame. A first interlocking portion and a second interlocking portion are provided between the main base material and each of the side base materials. The first interlocking portions are interlocked with each other in the seat height direction by inserting the main base material from above the seat, and the second interlocking portions are inserted so that the main base material is snap-fitted with each of the side base materials from the front of the seat in a manner that the main base material cannot move above the seat.

2. The seat cushion according to claim 1, wherein: The first fitting portion and the second fitting portion are formed between the main side fitting portion formed on the main base material and the side side fitting portions formed on each of the side base materials. Each of the side engaging portions protrudes from each of the side bases inward in the seat width direction beyond a dividing line between the main pad and each of the side pads, and engages with the main-side engaging portion immediately below the main pad.

3. The seat cushion according to claim 2, wherein: The first fitting portion is a concave-convex fitting structure, which is composed of a convex portion formed on the main base material and protruding below the seat, and a concave portion formed on each of the side base materials and opening above the seat. The second fitting portion is a claw fitting structure composed of a fitting hole formed in the main base material and penetrating in the seat front-rear direction, and a fitting claw formed in each of the side base materials and protruding forward of the seat.

4. The seat cushion according to any one of claims 1 to 3, wherein: The main base material further includes a frame hook, and the frame hook is snap-fitted with the seat frame from the front of the seat by the insertion so as to be unable to move upward from the seat.

5. The seat cushion according to any one of claims 1 to 3, wherein: The seat frame has: a pair of lower arms in the seat width direction, supporting the seat rear portion of the seat cushion body from the seat back side; and A tilt frame is connected between the pair of lower arms so as to be positionally adjustable in the seat height direction about a tilt axis extending in the seat width direction, and supports the seat front portion of the seat cushion body from the seat back side. Each of the side substrates is fixed to the inclined frame.

6. The seat cushion according to claim 5, wherein: The main substrate has: The front portion of the base material extends in an inverted U-shape in a plan view along the upper surface of a pair of inclined arms of the inclined frame in the seat width direction connected to the pair of lower arms and a inclined plate extending in the seat width direction between the front portions of the pair of inclined arms; The rear portion of the base material extends in a U-shape in a plan view along the upper surface of the rear tube extending in the seat width direction between the pair of lower arms and the rear portions of the pair of lower arms; and The flexible portion connects both ends of the inverted U-shape of the front portion of the base material to both ends of the U-shape of the rear portion of the base material so as to follow the movement of the tilt frame by bending.

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