Sheet

Abstract

To provide a seat capable of easily adjusting the stretching hardness of a net material.SOLUTION: A seat includes: a cushion body 20 for elastically supporting a seated person; and a cushion frame 10 supporting the cushion body 20. The cushion body 20 is composed of three division elements, which are a top-plate main 21 forming a central portion in a seat width direction and top-plate sides 22 forming both side portions in the seat width direction. The top-plate main 21 has: a frame body 21A fixed to the cushion frame 10 and a net material 21B formed of planar elastic fibers stretched on the frame body 21A. Each of the top-plate sides 22 includes: a top-plate side pad 22A serving as a cushion portion; a top-plate side cover 22B covering the top-plate side pad 22A; and a top-plate side resin member 22C as a support member fixed to a pad back-surface of the top-plate side pad 22A, thereby serving to attach an end of the top-plate side cover 22B and to fix to the cushion frame 10.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a vehicle seat in which a cushion body that elastically supports a seated occupant is made of a net material made of mesh-like elastic fibers. Specifically, the cushion body is configured such that the net material is stretched over a support frame, and the support frame is fixed to the seat frame, thereby assembling the cushion body to the seat frame.

[0003] The cushion body has a top plate that is the central portion in the seat width direction and is made of the net material. The cushion body also has side portions in the seat width direction and is made of polyurethane foam molded bodies that are wrapped in covers and fixed to the seat surface of the net material. The polyurethane foam molded bodies form side supports on each side of the top plate that support the body of the seated person from diagonal sides. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5614042 Summary of the Invention [Problem to be solved by the invention]

[0005] In the configuration described in Patent Document 1, side supports made of polyurethane foam molded bodies wrapped in covers are sewn to both sides of the net material. In other words, the main tabletop and each side tabletop are integrated with each other. This makes it difficult to adjust the cushioning properties of the main tabletop. Therefore, the present invention provides a seat that makes it easy to adjust the tension hardness of the net material. [Means for solving the problem]

[0006] To solve the above problems, the sheet of the present invention employs the following means.

[0007] That is, the first invention of the present invention is a seat having a cushion body that elastically supports a seated occupant and a seat frame that supports the cushion body from the underside of the seat, wherein the cushion body is made up of three divided elements: a main top plate that forms the central part in the seat width direction, and each side top plate that forms both side parts in the seat width direction, the main top plate has a frame body that is fixed to the seat frame, and a net material made of planar elastic fiber that forms a cushion part that is stretched over the frame, and each side top plate has a top plate side pad that forms a cushion part, a top plate side cover that covers the top plate side pad, and a support member that is fixed to the back surface of the pad, which is the surface of the underside of the seat of the top plate side pad, and is responsible for fastening the terminal of the top plate side cover and fixing it to the seat frame.

[0008] According to the first aspect of the present invention, the main table top, whose cushion portion is made of a net material, and each side table top, whose cushion portion is made of a side pad, are individually assembled to the seat frame without being connected to each other. With this configuration, the tension hardness of the net material of the main table top can be easily adjusted without affecting the hardness of the cushion portions of each side table top.

[0009] A second aspect of the present invention is a seat according to the first aspect, wherein the support member has a side support portion that supports the body of a seated occupant from an oblique side via the top board side pad.

[0010] According to the second aspect of the present invention, the side support portions of the support members that are fixed to the seat frame and support the top panel side pads from the back side of the seat can provide appropriate side support for the body of the seated occupant.

[0011] A third aspect of the present invention is the seat according to the first or second aspect, wherein the top plate side pads are set in a state where they are pressed against the net material from the front side of the seat.

[0012] According to the third aspect of the present invention, the top plate sides can be arranged in a good-looking manner so that gaps are less likely to be formed between the top plate sides and the main net material.

[0013] The fourth invention of the present invention is a sheet according to the first or second invention, wherein the frame body has a pair of vertical side portions extending along both edges of the main top plate in the seat width direction, and a pair of horizontal side portions extending in the seat width direction so as to connect the ends of the pair of vertical side portions, and the pair of horizontal side portions are each divided into two in the seat width direction with the center in the seat width direction as the center of rotation, and each divided side has a hinge structure in which each divided side is detachably pivoted to each other, and the net material is passed through each divided side and stretched over the frame body.

[0014] According to the fourth aspect of the present invention, the net material can be easily stretched over the frame body. Specifically, by releasing each divided edge of the frame body from its pivoted state, the net material can be passed through each end and stretched over or removed from the frame body. Furthermore, after the net material is passed through the frame body, when the divided edges of each horizontal side portion are assembled, they can be assembled in a bent state using the pivoted structure. Therefore, the frame body can be assembled without applying tension to the net material.

[0015] The fifth invention of the present invention is a seat according to the first or second invention, wherein the seat frame is configured as a cushion frame, which is a frame of a seat cushion equipped with a tilt mechanism that can adjust the seat cushion angle at the front edge of the seat, and the frame body is configured as two parts: a front frame body part that is fixed to a movable part, which is the front part, that is moved by the tilt mechanism of the cushion frame, and a rear frame body part that is fixed to a fixed part, which is the rear part, that supports the movable part of the cushion frame.

[0016] According to the fifth aspect of the present invention, the frame can be disposed over a wide area of ​​the main top plate of the seat cushion so as not to impede the operation of the tilt mechanism. Therefore, the net material can be appropriately stretched over a wide area of ​​the main top plate of the seat cushion equipped with the tilt mechanism.

[0017] The sixth invention of the present invention is a seat according to the first or second invention, wherein the main top plate forms the seating surface of the seat cushion, and the net material extends beyond the frame body and is placed over a front shield that covers the front part of the seat cushion, with the end of the net having an extension portion that is attached to the lower edge of the front shield.

[0018] According to the sixth aspect of the present invention, the net material stretched mainly over the top plate of the seat cushion can be stretched in a continuous, attractive manner all the way to the front side of the seat cushion by utilizing the configuration of the front shield. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view illustrating a schematic configuration of a seat according to a first embodiment. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is an exploded perspective view showing the cushion body removed from the cushion frame. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 3. [Figure 8] FIG. [Figure 9] FIG. 2 is an exploded perspective view showing the cushion body removed from the back frame. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0021] First Embodiment (Outline of Sheet 1) First, the configuration of a seat 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 12. In the following description, when directions such as front, back, up, down, left, and right are indicated, they refer to the directions shown in the respective drawings. Furthermore, when directions such as the "seat width direction" are indicated with the word "seat," they refer to directions based on the orientation of the seat 1, which will be described later. Furthermore, in the following description, when no specific reference drawing is indicated or when no reference drawing has a corresponding symbol, any of FIGS. 1 to 12 will be referred to as appropriate.

[0022] As shown in Figure 1, the seat 1 according to this embodiment is configured as a single-seat right-side seat installed on the floor of an automobile. The seat 1 includes a seat back 2 that forms the backrest for the seated occupant, a seat cushion 3 that forms the seating portion, and a headrest 4 that forms the headrest portion.

[0023] (Configuration of seat cushion 3) As shown in Fig. 2, the seat cushion 3 is equipped with a tilt mechanism M that can adjust the seating angle of the front edge of the seat. As shown in Figs. 3 and 4, the seat cushion 3 has a metal cushion frame 10 that forms the framework of the seat cushion, and a cushion body 20 that is attached to the upper part of the cushion frame 10 and elastically supports the buttocks and thighs of a seated occupant. Here, the cushion frame 10 corresponds to the "seat frame" of the present invention.

[0024] As shown in Figure 4, the cushion body 20 is composed of three divided elements: a main top plate 21 that forms the center portion in the seat width direction, and side top plate 22 that form both side portions in the seat width direction. The main top plate 21 is the portion that supports the buttocks and thighs of a seated occupant from below. The top surface of the main top plate 21, which is the surface facing the seat, has a substantially flat surface shape that faces upward toward the seat so that it is slightly upward in front.

[0025] Each of the top panel sides 22 is configured to support the buttocks and thighs of a seated occupant from diagonally outward downward. The top surface of each of the top panel sides 22, which is the seat front surface, is shaped to rise diagonally upward toward the outside in the seat width direction.

[0026] The main top plate 21 and each side top plate 22 are configured to be individually assembled to the cushion frame 10. More specifically, the main top plate 21 and each side top plate 22 are configured to be easily attached to and detached from the cushion frame 10 without removing the seat 1 from a state in which it is installed on the floor. This will be described in detail later.

[0027] The specific configuration of each part of the seat cushion 3 will be described below. As shown in Figures 4 and 5, the cushion frame 10 has a pair of left and right lower arms 11 that extend in the front-rear direction along both left and right sides of the seat cushion 3. The cushion frame 10 also has a tilt panel 12 that extends in a planar shape across the front ends of the lower arms 11. The cushion frame 10 also has a pair of left and right tilt arms 12A that extend from both left and right edges of the tilt panel 12 toward the rear of the seat.

[0028] The rear end of each tilt arm 12A is rotatably connected to the middle portion of the corresponding lower arm 11 by a tilt rotation shaft 12B extending in the seat width direction. Each tilt arm 12A is configured to be movable up and down around each tilt rotation shaft 12B by a drive unit (not shown) attached to cushion frame 10.

[0029] The up and down movement of each tilt arm 12A moves tilt panel 12 so as to change the angle in the up and down direction relative to each lower arm 11. This adjusts the seating angle of the seat front edge portion of seat cushion 3. The above-mentioned tilt mechanism M is made up of a mechanism that enables the angle of tilt panel 12 to be adjusted relative to each lower arm 11. Here, tilt panel 12 corresponds to the "movable part" of the present invention.

[0030] The cushion frame 10 further includes a front pipe 13 made of a round pipe bridging between the front portions of the lower arms 11, and a rear pipe 14 made of a round pipe bridging between the rear portions of the lower arms 11. The front pipe 13 is bridging between the lower arms 11 at a position rearward and below the tilt panel 12. The rear pipe 14 is bridging between the rear ends of the lower arms 11.

[0031] Each tilt arm 12A described above has an inverted L-shaped cross section that covers the corresponding lower arm 11 from above the seat and from the inside in the seat width direction. Engagement holes Ah that penetrate the top panel portion of each tilt arm 12A in the height direction are formed at two positions in the front-to-rear direction of the seat. These engagement holes Ah are adapted to engage with mating clips C12 attached to the back surface of top panel side resin member 22C on the back side of the seat of the corresponding top panel side 22 via a snap fit when inserted from above the seat.

[0032] (Top board main 21 configuration) Next, the configuration of the main top plate 21 and each side top plate 22 that constitute the cushion body 20 will be described. First, the configuration of the main top plate 21 will be described. As shown in FIG. 4, the main top plate 21 has a frame body 21A fixed to the cushion frame 10, and a cushion net 21B made of planar elastic fiber stretched over the frame body 21A. The main top plate 21 also has a lumbar pillow 21C sewn along the rear edge of the cushion net 21B. Here, the cushion net 21B corresponds to the "net material" of the present invention.

[0033] The frame body 21A is composed of two bodies, a front frame body portion A10 and a rear frame body portion A20. A front region of the cushion net 21B is stretched over the front frame body portion A10. A rear region of the cushion net 21B is stretched over the rear frame body portion A20. As shown in FIG. 5, the front frame body portion A10 is assembled into a rectangular frame shape in a plan view, having a pair of left and right vertical side portions A11 and a pair of front and rear horizontal side portions A12. The rear frame body portion A20 is also assembled into a rectangular frame shape in a plan view, having a pair of left and right vertical side portions A21 and a pair of front and rear horizontal side portions A22.

[0034] The front frame A10 has its left and right vertical sides A11 fastened to the corresponding tilt arms 12A with bolts. The front frame A10 is also set with its front horizontal side A12 in contact with the tilt panel 12. This allows the front frame A10 to be integral with the tilt panel 12, which is a movable part moved by the tilt mechanism M.

[0035] The rear frame body A20 has its left and right vertical sides A21 fastened to the corresponding lower arms 11 with bolts. The rear frame portion of the rear frame body A20, including its rear horizontal side A22, is set in a state in which it is hung from above the seat on the rear pipe 14. As a result, the rear frame body A20 is configured to be integral with the lower arms 11, which serve as fixed parts that rotatably support the tilt panel 12. Here, the lower arms 11 correspond to the "fixed parts" of the present invention. The tilt panel 12 corresponds to the "movable part" of the present invention.

[0036] As shown in Figures 5 and 6, the left and right vertical sides A11 of the front frame A10 are each formed from a single round pipe. The round pipe forming each vertical side A11 has its front and rear ends bent downward toward the seat, and then further bent inward in the seat width direction. The front and rear horizontal sides A12 of the front frame A10 are each formed from a horizontally elongated plate material bent into a U-shaped cross section.

[0037] The right and left ends of each horizontal side A12 are welded to the ends of the front and rear ends of the corresponding vertical side A11, which are bent inward in the seat width direction. Each horizontal side A12 has a hinge structure including a pair of divided sides A13 that divide the horizontal side A12 in half in the seat width direction and a pivot A14 that detachably pivots the inner ends of these divided sides A13 together. The pivot A14 of each horizontal side A12 connects the left and right divided sides A13 to each other so that they can rotate about the same axis that extends in the seat front-rear direction.

[0038] The connection allows the divided sides A13 to rotate about the pivot A14 from a state in which they extend in a straight line in the seat width direction. By fastening the front frame body A10 to the cushion frame 10 with bolts, the divided sides A13 are fixed in a state in which they are held in position so that they extend in a straight line in the seat width direction.

[0039] Similarly, the left and right vertical sides A21 of the rear frame A20 are each formed from a single round pipe. The round pipe forming each vertical side A21 has its front and rear ends bent downward toward the seat, and then further bent inward in the seat width direction. The front and rear horizontal sides A22 of the rear frame A20 are each formed from a horizontally elongated plate material bent into a U-shaped cross section.

[0040] The right and left ends of each horizontal side A22 are welded to the ends of the front and rear ends of the corresponding vertical side A21, which are bent inward in the seat width direction. Each horizontal side A22 has a hinge structure including a pair of divided sides A23 that divide the horizontal side A22 in half in the seat width direction and a pivot A24 that detachably pivots the inner ends of these divided sides A23 together. The pivot A24 of each horizontal side A22 connects the left and right divided sides A23 to each other so that they can rotate about the same axis that extends in the front-to-rear direction of the seat.

[0041] The connection allows the divided sides A23 to rotate about the pivot A24 from a state in which they extend in a straight line in the seat width direction. By fastening the rear frame portion A20 to the cushion frame 10 with bolts, the divided sides A23 are fixed in a state in which they are held in position so that they extend in a straight line in the seat width direction.

[0042] 4 and 6, the cushion net 21B is made of a net material made of stretchable elastic fibers woven and knitted into a planar shape. By making the cushion part out of the cushion net 21B, the entire structure is made thinner and lighter than when the cushion part is made out of a polyurethane foam molded body.

[0043] The left and right ends of the cushion net 21B are formed with through-holes B11 that are folded into the backside of the seat and sewn into a cylindrical shape. The cushion net 21B is stretched over the front frame body A10 and the rear frame body A20 by having the vertical side portions A11 of the front frame body A10 and the vertical side portions A21 of the rear frame body A20 pass through the left and right through-holes B11.

[0044] Specifically, the cushion net 21B is passed through the front frame body A10 and the rear frame body A20 and stretched as follows. First, the procedure for passing the front frame body A10 through the cushion net 21B will be described. With the front frame body A10 in a separated state before the divided sides A13 of the front and rear horizontal sides A12 are connected to each other, the right and left frame pieces are individually passed through the corresponding passing portions B11 of the cushion net 21B in order, starting from either end.

[0045] Next, after the left and right vertical side portions A11 of the front frame body portion A10 are passed through the corresponding through-portions B11 of the cushion net 21B, the corresponding left and right divided sides A13 are connected to each other by the pivots A14. At this time, since the pivots A14 can be connected while the divided sides A13 are assembled in a bent state, the front frame body portion A10 can be assembled without tensioning the cushion net 21B. The procedure for passing the rear frame body portion A20 through the cushion net 21B and assembling it is the same.

[0046] After the above assembly, the front frame A10 and the rear frame A20 are bolted to the cushion frame 10, whereby the cushion net 21B is set in a stretched state between the left and right vertical sides A11 of the front frame A10 and between the left and right vertical sides A21 of the rear frame A20. As shown in Fig. 7, the front frame A10 and the rear frame A20 are configured so that their left and right vertical sides A11, A21 are positioned directly below each of the top panel side pads 22A (described later).

[0047] As a result, the cushion net 21B is not separated from each top panel side pad 22A in the seat width direction, and is assembled to each other in a state where they appear to be one unit. Also, each vertical side A11 of the front frame body A10 and each vertical side A21 of the rear frame body A20 are covered from the seat surface by each top panel side pad 22A, making it less likely that a seated occupant will feel a foreign body sensation.

[0048] 4, the cushion net 21B has an extension B12 that extends beyond the front horizontal side A12 of the front frame body A10 to the front of the seat. The extension B12 is pulled under the seat so as to cover the front of the seat with a resin windshield 3A that covers the front side of the seat cushion 3, and its end is fastened to the lower edge of the windshield 3A.

[0049] Although specific illustrations are omitted, various portions of the rear surface of the front shield 3A are fixed to the front surface of the tilt panel 12 using clips (not shown). By fastening the extensions B12, the cushion net 21B is tensioned in an attractive manner so as to extend continuously from the upper surface of the seat cushion 3 to the front side.

[0050] As shown in Fig. 1, the lumbar pillow 21C is a member that functions as a screen to fill the gap between the rear end of the seat cushion 3 and the lower end of the seatback 2. The lumbar pillow 21C is made of a cushioning material in which a nonwoven fabric folded into a triangular cross section is wrapped in a skin material.

[0051] The lumbar pillow 21C rises from the rear end of the cushion net 21B in a shape that forms a triangular cross section, and the rising surface fills the gap between the rear end of the main top plate 21 of the seat cushion 3 and the lower end of the main top plate 41 of the seat back 2, which will be described later. The lumbar pillow 21C is provided so as to extend continuously across the entire area of ​​the cushion net 21B in the seat width direction.

[0052] The lumbar pillow 21C is set in a state where it is pressed slightly against the bank-shaped inclined surface that forms the seat front surface of each of the side top plates 22 by assembling each side top plate 22 to both the left and right sides of the main top plate 21 of the seat cushion 3. As a result, the lumbar pillow 21C is also able to properly fill the gap between the rear end of each side top plate 22 of the seat cushion 3 and the lower end of each side top plate 42 of the seat back 2.

[0053] (22 pieces per tabletop side) Next, the configuration of each table top side 22 will be described with reference to Figures 4, 6, and 7. Each table top side 22 has a table top side pad 22A that serves as a cushioning portion, a table top side cover 22B made of fabric that covers the table top side pad 22A, and a table top side resin member 22C that is provided on the back surface of the table top side pad 22A. Each table top side 22 has a symmetrical configuration with the same basic structure. Here, the table top side resin member 22C corresponds to the "support member" of the present invention.

[0054] As shown in Figure 7, the top panel side pad 22A is made of a polyurethane foam molded body. The top panel side pad 22A has a pad surface, which is the surface facing the seat, formed with a bank-like protrusion that rises obliquely upward from the inside to the outside in the seat width direction. The back surface of the top panel side pad 22A is formed into a concave curved surface that is hollowed out to be recessed along the bank-like protrusion.

[0055] The table top side cover 22B is placed over the table top side pad 22A from above the seat, and its front, rear, left, and right peripheral edges are drawn into and fastened to the back surface of the table top side pad 22A. Specifically, the left, right, front, and rear ends of the table top side cover 22B drawn into the back surface of the pad are hooked onto and fastened to curved table top side resin members 22C provided along the back surface of the pad.

[0056] By the above-mentioned hooking, the top plate side cover 22B is stretched over the entire outer surface of the top plate side pad 22A. Furthermore, the top plate side resin member 22C is fixed in a state pressed against the back surface of the pad of the top plate side pad 22A through the hooking at each end of the top plate side cover 22B.

[0057] 6 and 7, the table top side resin member 22C is an injection-molded product formed to fit the concave curved surface of the back surface of the table top side pad 22A. The table top side resin member 22C has a side support portion C13 formed in it, which supports the bank-shaped protruding portion of the table top side pad 22A from the back side of the pad at an angle along the protrusion. The side support portion C13 supports the bank-shaped protruding portion of the table top side pad 22A from the back side of the pad in a planar manner, allowing the table top side pad 22A to provide appropriate side support for the body of a seated occupant.

[0058] Cover hooks C11 are formed on the periphery of the top panel side resin member 22C to fasten the terminals that are pulled into the back surface of the pad of the top panel side cover 22B. Also, as shown in Fig. 6, resin fitting clips C12 are attached to the concavely curved top panel portion of the top panel side resin member 22C at two positions in the front-to-rear direction of the seat.

[0059] 4, when assembling each tabletop side 22 to the cushion frame 10, these mating clips C12 are inserted with a snap fit from above the seat into corresponding engagement holes Ah formed in the tabletop portion of each tilt arm 12A. By this insertion, each tabletop side 22 is engaged with each tilt arm 12A and set in a fixed position.

[0060] 7, by the above-described assembly, each table top side 22 is set in a state in which the back surface of the pad on the inner edge side of each table top side pad 22A, which is not supported from the back side by the table top side resin member 22C, is pressed against the upper surface of the cushion net 21B. As a result, each table top side 22 is arranged in an attractive manner so that gaps are unlikely to form between each table top side 22 and the cushion net 21B of the table top main 21.

[0061] (Seatback 2 configuration) Next, the specific configuration of each part of the seat back 2 will be described with reference to Figures 8 and onwards. As shown in Figures 8 and 9, the seat back 2 has a metal back frame 30 that forms the framework of the seat back 2, and a cushion body 40 that is attached to the front of the back frame 30 and elastically supports the waist and back of the seated occupant. The seat back 2 also has a backboard 50 that is attached to the rear of the back frame 30 and covers the rear surface of the seat back 2. Here, the back frame 30 corresponds to the "seat frame" of the present invention.

[0062] The cushion body 40 is composed of three divided elements: a main top plate 41 that forms the center portion in the seat width direction, and side top plate portions 42 that form both side portions in the seat width direction. The main top plate 41 is the portion that supports the waist and back of the seated person from behind.

[0063] Each of the top panel sides 42 supports the lumbar region and back of a seated occupant from the rearward and outward diagonal direction. Each of the top panel sides 42 has a front surface, which is the seat surface, that rises obliquely forward and outward in the seat width direction.

[0064] As shown in Fig. 9, the main top plate 41 and each side top plate 42 are configured to be individually assembled to the back frame 30. More specifically, the main top plate 41 and each side top plate 42 are configured to be easily attached to and detached from the back frame 30 without removing the seat 1 from a state in which it is installed on the floor. This will be described in detail later.

[0065] 9 and 10, the back frame 30 has a pair of left and right side frames 31 extending in the up-down direction along both the left and right sides of the seat back 2. The back frame 30 also has an upper frame 32 spanning the upper ends of the side frames 31, and a lower frame 33 spanning the lower ends of the side frames 31.

[0066] A bracket with a round engagement hole 31A is joined to the outer portion of the lower end of each side frame 31. These engagement holes 31A are adapted to engage with mating clips C33 attached to the lower part of the top panel side resin member 42C on the seat back side of the corresponding side top panel 42 with a snap fit when inserted from the front of the seat.

[0067] Support brackets 32A, each extending in a rectangular cylindrical shape in the vertical direction, are welded to two locations on the left and right sides of the upper frame 32, penetrating the upper frame 32 in the vertical direction. Each support bracket 32A is inserted into and welded to the top and bottom plate portions of the upper frame 32 so as to penetrate the upper frame 32 in the vertical direction. More specifically, each support bracket 32A is provided so that its upper end protrudes from the top plate portion of the upper frame 32 above the seat.

[0068] 1 is inserted from above the seat to the upper part of the seat back 2. Headrest supports (not shown) that can be attached by inserting a pair of left and right headrest stays (not shown) hanging down from the headrest 4 from above the seat are inserted into and attached to each support bracket 32A from above the seat.

[0069] A fitting hole 32B is formed in each of the left and right ends (shoulder portions) of the upper frame 32, bored so that the top plate portion passes through in the vertical direction. A convex upper end fitting portion C32 formed on the upper portion of the top plate side resin member 42C on the back side of the seat of the corresponding top plate side 42 is hooked from above the seat into each fitting hole 32B.

[0070] (Top plate main 41 configuration) Next, the configuration of the main top plate 41 and each side top plate 42 that make up the cushion body 40 will be described. First, the configuration of the main top plate 41 will be described. As shown in Figures 9 and 11, the main top plate 41 has a frame body 41A fixed to the back frame 30, and a back net 41B made of planar elastic fiber stretched over the frame body 41A. The main top plate 41 also has a neck pillow 41C attached to the top of the upper frame 32. Here, the back net 41B corresponds to the "net material" of the present invention.

[0071] 10 , the frame body 41A is assembled into a rectangular frame shape in a front view, having a pair of left and right vertical side portions A31 and a pair of upper and lower horizontal side portions A32. The left and right vertical side portions A31 of the frame body 41A are fixed to the corresponding side frames 31 by fastening them with bolts. The upper horizontal side portion A32 of the frame body 41A is fixed to the upper frame 32 by fastening them with bolts. The lower horizontal side portion A32 of the frame body 41A is fixed to the lower frame 33 by fastening them with bolts.

[0072] As shown in Figures 10 and 11, the frame 41A has left and right vertical sides A31 each formed from a single round pipe. The round pipe forming each vertical side A31 has an upper and lower end bent inward in the sheet width direction. The upper and lower horizontal sides A32 of the frame 41A are each formed from a horizontally elongated plate bent into a U-shaped cross section.

[0073] The right and left ends of each horizontal side A32 are welded to the ends of the upper and lower ends of the corresponding vertical side A31, which are bent inward in the seat width direction. Each horizontal side A32 has a hinge structure including a pair of divided sides A33 that divide the horizontal side A32 in half in the seat width direction and a pivot A34 that detachably pivots the inner ends of these divided sides A33 together. The pivot A34 of each horizontal side A32 connects the left and right divided sides A33 to each other so that they can rotate about the same axis that extends in the vertical direction.

[0074] The connection allows the divided sides A33 to rotate about the pivot A34 from a state in which they extend in a straight line in the seat width direction. By fastening the frame 41A to the back frame 30 with bolts, the divided sides A33 are fixed in a state in which they are held in position so that they extend in a straight line in the seat width direction.

[0075] 9 and 11, the back net 41B is made of a net material made of stretchable elastic fibers woven and knitted into a sheet shape. By using the back net 41B for the cushion part, the entire structure is made thinner and lighter than when the cushion part is made of a polyurethane foam molded body.

[0076] The left and right ends of the back net 41B are formed with through-holes B21 that are folded into the backside of the seat and sewn into a cylindrical shape. The back net 41B is tensioned on the frame body 41A by passing the vertical side portions A31 of the frame body 41A through the left and right through-holes B21.

[0077] Specifically, the back net 41B is passed through the frame body 41A and stretched as follows: In other words, in the separated state of the frame body 41A before the divided sides A33 of the upper and lower horizontal sides A32 are connected to each other, the right frame piece and the left frame piece are individually passed through the corresponding through-portions B21 of the back net 41B, one at a time, starting from one end.

[0078] Next, after the left and right vertical side portions A31 of the frame body 41A are passed through the corresponding through-portions B21 of the back net 41B, the corresponding left and right divided sides A33 are connected to each other by the pivot A34. At this time, since the pivot A34 can be connected while the divided sides A33 are assembled in a bent state, the frame body 41A can be assembled without applying strong tension to the back net 41B.

[0079] After the assembly, the frame 41A is bolted to the back frame 30, whereby the back net 41B is set in a stretched state between the left and right vertical side portions A31 of the frame 41A. As shown in Fig. 12, the frame 41A is configured so that its left and right vertical side portions A31 are positioned so as to be recessed behind each of the top board side pads 42A (described later).

[0080] As a result, the back net 41B is not separated from each of the top panel side pads 42A in the seat width direction, and is assembled to each other in a state where they appear to be one unit. Also, each vertical side portion A31 of the frame body 41A is covered from the seat surface side by each of the top panel side pads 42A, making it less likely that the seat occupant will feel a foreign body sensation.

[0081] 9, the back net 41B has an extension B22 that extends beyond the upper horizontal side A32 of the frame body 41A above the seat. The extension B22 is pulled toward the rear of the seat so as to cover the upper surface of the upper frame 32, and support through-holes B23 formed at two positions on the left and right of the extension B22 are passed from above the seat and hooked onto support brackets 32A that protrude above the seat from the upper frame 32.

[0082] The neck pillow 41C is a member that functions as a cushioning material for the upper end portion of the seat back 2. The neck pillow 41C is configured as a cushioning material in which a padding material made of a polyurethane foam molded body is wrapped in a skin material.

[0083] After the frame body 41A with the stretched back net 41B is assembled to the back frame 30, the neck pillow 41C is set so as to cover from above the seat the upper surface of the upper frame 32 that is covered with the extension part B22 of the back net 41B. Specifically, the neck pillow 41C is set on the upper frame 32 by having the support through-holes C21 formed in two positions on the left and right of the neck pillow 41C pass from above the seat through the respective support brackets 32A that protrude from the upper frame 32 above the seat.

[0084] As a result of the above assembly, the neck pillow 41C is assembled and fixed to the upper frame 32 with the upper frame 32 sandwiched in the seat front-rear direction between the portion extending downward from its front edge and the portion extending downward from its rear edge. As a result, the portion of the neck pillow 41C extending downward from its front edge is pressed against the front surface of the back net 41B, and the neck pillow 41C is arranged in an attractive manner to prevent a gap from being formed between the back net 41B.

[0085] (42 pieces per tabletop side) Next, the configuration of each table top side 42 will be described with reference to Figures 9 and 11. Each table top side 42 has a table top side pad 42A that serves as a cushioning portion, a table top side cover 42B made of fabric that covers the table top side pad 42A, and a table top side resin member 42C that is provided on the back surface of the table top side pad 42A. Each table top side 42 has a configuration with approximately the same basic structure. Here, the table top side resin member 42C corresponds to the "support member" of the present invention.

[0086] 9 and 12, the top panel side pad 42A is made of a polyurethane foam molded body. The top panel side pad 42A has a pad surface, which is the surface facing the seat, formed with a bank-like protrusion that rises obliquely from the inside to the outside in the seat width direction toward the front of the seat.

[0087] The back surface of the top plate side pad 42A is formed into a concave curved surface that is hollowed out to be recessed along the bank-like protrusion. As shown in Figures 9 and 11, the top plate side pad 42A also has an eave portion at its top that is placed over the top plate portion of the upper frame 32 from above the seat.

[0088] The top plate side cover 42B is placed over the top plate side pad 42A from the front of the seat, and its upper, lower, left, and right peripheral edges are drawn into and fastened to the back surface of the top plate side pad 42A. Specifically, the top plate side cover 42B has its upper, lower, left, and right ends drawn into the back surface of the pad hooked onto and fastened to curved top plate side resin members 42C provided along the back surface of the pad.

[0089] By the above-mentioned hooking, the table top side cover 42B is stretched over the entire outer surface of the table top side pad 42A. Furthermore, the table top side resin member 42C is fixed in a state pressed against the back surface of the pad of the table top side pad 42A through the hooking at each end of the table top side cover 42B.

[0090] 11 and 12, table top side resin member 42C is an injection-molded product formed to fit the concave curved surface on the back surface of table top side pad 42A. Table top side resin member 42C has a side support portion C35 formed in it, which supports the bank-shaped protruding portion of table top side pad 42A from the back surface of the pad at an angle along the protrusion. This side support portion C35 supports the bank-shaped protruding portion of table top side pad 42A from the back surface of the pad in a planar manner, allowing table top side pad 42A to provide appropriate side support for the body of a seated occupant.

[0091] Cover hooks C31 are formed on the periphery of the top-plate side resin member 42C to fasten the terminals that are pulled into the pad rear surface of the top-plate side cover 42B. Also, as shown in Fig. 11, an upper end fitting portion C32 that protrudes downward from the seat is formed in the eaves region of the top-plate side resin member 42C that overlaps the pad rear surface of the eaves portion of the top-plate side pad 42A.

[0092] 9, when the top panel side 42 is assembled to the back frame 30, the upper end fitting portions C32 are inserted from above the seat into corresponding fitting holes 32B formed at the left and right ends (shoulders) of the upper frame 32. By this insertion, the upper portion of the top panel side 42 is hooked onto the upper frame 32 and set in a fixed position.

[0093] As shown in Fig. 11, a base portion that protrudes toward the rear of the seat is formed at the bottom of the top panel side resin member 42C, and a fitting clip C33 is attached to the tip of the base portion. As shown in Fig. 9, when the top panel side 42 is assembled to the back frame 30, the fitting clip C33 is inserted with a snap fit into a corresponding round engaging hole 31A formed in the rear edge portion of the lower end of each side frame 31. By this insertion, the bottom of the top panel side 42 is engaged with the bottom of each side frame 31 and set in a fixed position.

[0094] 12, a plate-shaped fastening portion C34 is formed in the vertical middle portion of the top panel side resin member 42C, extending from the inner edge in the seat width direction toward the rear of the seat. The fastening portion C34 is set so as to overlap the inner portion of each side frame 31 by assembling the top panel side 42 to the back frame 30.

[0095] After the above setting, the bolts B are inserted into these from the inside in the seat width direction and fastened. As a result, the fastening portion C34 is fastened to the inside portion of the side frame 31 in an overlapping manner.

[0096] To summarize the above, the sheet 1 according to this embodiment has the following configuration: Note that the reference numerals in parentheses below correspond to the respective components shown in the above embodiment.

[0097] That is, the seat (1) has a cushion body (20, 40) that elastically supports a seated person and a seat frame (10, 30) that supports the cushion body (20, 40) from the back side of the seat. The cushion body (20, 40) is composed of three divided elements: a main top plate (21, 41) that forms the center part in the seat width direction, and side top plates (22, 42) that form both side parts in the seat width direction.

[0098] The main table top (21, 41) has a frame body (21A, 41A) fixed to the seat frame (10, 30) and a planar net material (21B, 41B) made of elastic fiber that serves as a cushioning portion stretched over the frame body (21A, 41A). Each table top side (22, 42) has a table top side pad (22A, 42A) that serves as a cushioning portion, a table top side cover (22B, 42B) that covers the table top side pad (22A, 42A), and a support member (22C, 42C) that is fixed to the back surface of the table top side pad (22A, 42A) that is the back surface of the table top side pad (22A, 42A) and that fastens the end of the table top side cover (22B, 42B) and secures the table top side cover to the seat frame (10, 30).

[0099] According to the above configuration, the main top plate (21, 41) whose cushion portion is made of the net material (21B, 41B) and each side top plate (22, 42) whose cushion portion is made of the top plate side pad (22A, 42A) are individually assembled to the seat frame (10, 30) without any intervening space. With this configuration, the tension hardness of the net material (21B, 41B) of the main top plate (21, 41) can be easily adjusted so as not to affect the hardness of the cushion portion of each side top plate (22, 42).

[0100] In addition, the support member (22C, 42C) has side support portions (C13, C35) that support the body of the seated occupant from diagonally laterally via the top plate side pad (22A, 42A). According to the above configuration, the side support portions (C13, C35) of the support member (22C, 42C) that are fixed to the seat frame (10, 30) and support the top plate side pad (22A, 42A) from the back side of the seat can provide appropriate side support for the body of the seated occupant.

[0101] In addition, the top panel side pads (22A, 42A) are set in a state where they are pressed against the net material (21B, 41B) from the front side of the seat. According to the above configuration, the top panel sides (22, 42) can be arranged in an attractive manner so as to prevent gaps from being formed between the top panel sides and the net material (21B, 41B) of the main top panel (21, 41).

[0102] The frame (21A, 41A) has a pair of vertical sides (A11, A21, A31) extending along both edges of the main top plate (21, 41) in the seat width direction, and a pair of horizontal sides (A12, A22, A32) extending in the seat width direction so as to connect the ends of the pair of vertical sides (A11, A21, A31). Each of the pair of horizontal sides (A12, A22, A32) is divided into two in the seat width direction with the center of rotation in the seat width direction, and each divided side (A13, A23, A33) has a hinge structure in which the divided sides are detachably pivotally connected to each other. A net (21B, 41B) is passed through each divided side (A13, A23, A33) and stretched across the frame (21A, 41A).

[0103] According to the above configuration, the net material (21B, 41B) can be easily stretched over the frame body (21A, 41A). Specifically, by releasing the respective divided sides (A13, A23, A33) of the frame body (21A, 41A) from their pivoted state, the net material (21B, 41B) can be passed through each end and stretched over or removed from the frame body (21A, 41A). Furthermore, after the net material (21B, 41B) is passed through the frame body (21A, 41A), when the divided sides (A13, A23, A33) of the respective horizontal side portions (A12, A22, A32) are assembled together, they can be assembled in a bent state using the pivoted structure. Therefore, the frame body (21A, 41A) can be assembled in a state where tension of the net material (21B, 41B) is not easily applied to the frame body (21A, 41A).

[0104] The seat frame (10) is configured as a cushion frame (10) that is a frame of the seat cushion (3) equipped with a tilt mechanism (M) that can adjust the seat cushion angle at the front edge of the seat. The frame body (21A) is configured as two separate bodies: a front frame body part (A10) that is fixed to a movable part (12) that is the front part moved by the tilt mechanism (M) of the cushion frame (10), and a rear frame body part (A20) that is fixed to a fixed part (11) that is the rear part that supports the movable part (12) of the cushion frame (10).

[0105] According to the above configuration, the frame body (21A) can be disposed over a wide area of ​​the main top plate (21) of the seat cushion (3) so as not to interfere with the operation of the tilt mechanism (M). Therefore, the net material (21B) can be appropriately stretched over a wide area of ​​the main top plate (21) of the seat cushion (3) equipped with the tilt mechanism (M).

[0106] In addition, the main top plate (21) forms the seat surface of the seat cushion (3), and the net material (21B) extends beyond the frame body (21A) and is placed over the front shield (3A) that covers the front side of the seat cushion (3), with the end of the net material having an extension (B12) fastened to the lower edge of the front shield (3A). According to the above configuration, the net material (21B) stretched over the main top plate (21) of the seat cushion (3) can be stretched in a continuous, attractive manner up to the front side of the seat cushion (3) by utilizing the configuration of the front shield (3A).

[0107] Other Embodiments Although one embodiment of the present invention has been described above, the present invention can be embodied in various forms other than the above embodiment.

[0108] 1. The seat of the present invention can be applied to seats installed in vehicles other than automobiles, such as trains, as well as in vehicles other than automobiles, such as aircraft and ships.

[0109] 2. The support members on each side of the tabletop may be made of metal instead of resin. The tabletop side covers may be made of leather instead of fabric. [Explanation of symbols]

[0110] 1 sheet 2 seat backs 3 seat cushions 3A Front Shield 4 Headrest 10 Cushion frame (seat frame) 11 Lower arm (fixed part) 12 Tilt panel (movable part) 12A Tilt Arm Ah engagement hole 12B Tilt rotation axis 13 Front pipe 14 Rear pipe M Tilt mechanism 20 cushion body 21 Main top 21A frame A10 Front frame body A11 Vertical side A12 Side part A13 Split edge A14 Axis A20 Rear frame body A21 Vertical side A22 Side part A23 Split edge A24 Axis 21B Cushion net (net material) B11 Through part B12 Extension 21C Lumbar Pillow 22 Top plate side 22A Top board side pad 22B Top plate side cover 22C Top plate side resin material (support material) C11 Cover hook C12 Mating Clip C13 Side support part 30 Back frame (seat frame) 31 Side frame 31A Engagement hole 32 Upper frame 32A Support Bracket 32B fitting hole 33 Lower frame 40 cushion body 41 Main top 41A Frame A31 Vertical side A32 side part A33 Split edge A34 Axis 41B Back net (net material) B21 Through part B22 Extension B23 Support through hole 41C Neck Pillow C21 Support through hole 42 Top plate side 42A Top board side pad 42B Top plate side cover 42C Top plate side resin material (support material) C31 Cover Hook C32 Upper end fitting part C33 Mating Clip C34 fastening part C35 side support part 50 Backboard B Bolt

Claims

1. A seat having a cushion body that elastically supports a seated person and a seat frame that supports the cushion body from the back side of the seat, The cushion body is composed of three divided elements: a main top plate forming a central portion in the seat width direction; and side top plates forming both side portions in the seat width direction. The main top panel has a frame body fixed to the seat frame and a net material made of a planar elastic fiber that serves as a cushion portion stretched over the frame body, Each of the table top sides has a table top side pad that serves as a cushion portion, a table top side cover that covers the table top side pad, and a support member that is fixed to the back surface of the table top side pad, which is the surface of the table top side pad on the back side of the seat, and that fastens the end of the table top side cover and secures it to the seat frame.

2. The sheet according to claim 1, The support member has a side support portion that supports the body of the seated occupant from the oblique side via the top board side pad.

3. The sheet according to claim 1 or claim 2, The seat is set in a state in which the top plate side pads are pressed against the net material from the front side of the seat.

4. The sheet according to claim 1 or claim 2, The frame body has a pair of vertical side portions extending along both edges of the top plate main in the seat width direction, and a pair of horizontal side portions extending in the seat width direction so as to connect each end of the pair of vertical side portions, and the pair of horizontal side portions are each divided into two in the seat width direction so as to have a center portion in the seat width direction as a rotation center, and each divided side has a hinge structure in which the divided sides are detachably pivotally connected to each other, The net material is passed through each of the divided sides and stretched over the frame body.

5. The sheet according to claim 1 or claim 2, The seat frame is configured as a cushion frame, which is a frame of a seat cushion equipped with a tilt mechanism that can adjust the seat cushion angle of the front edge portion of the seat, The frame body is composed of two parts: a front frame body part that is fixed to a movable part, which is the front part of the cushion frame, that is moved by the tilt mechanism, and a rear frame body part that is fixed to a fixed part, which is the rear part of the cushion frame, that supports the movable part.

6. The sheet according to claim 1 or claim 2, The main top plate forms the seating surface of the seat cushion, and the net material extends beyond the frame body and is placed over a front shield that covers the front part of the seat cushion, with the end of the net having an extension that is attached to the lower edge of the front shield.

Images