Seat cushion

Abstract

To provide a seat cushion capable of easily attaching / detaching a top plate main to / from a seat frame, the top plate main having a structure separated from respective top plate sides.SOLUTION: A seat cushion 1 is structured so that a cushion body elastically supporting a seating person is composed of three separated elements of a top plate main 2A forming a center part in a seat width direction and respective top plate sides 2B forming both side parts in the seat width direction. Between a main substrate A3 attached to a pad rear surface of the top plate main 2A and side substrates B3 attached to the pad rear surfaces of the respective top plate sides 2B, a first engagement part F1 which is engaged with the main substrate A3 in a seat height direction by being inserted from a seat upper direction and a second engagement part F2 with which the main substrate A3 is engaged in a snap fitting from a seat front direction so as to disable the movement to the respective side substrates B3 in the seat upper direction are formed.SELECTED DRAWING: Figure 8

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 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 seat cushion in which a cushion body consisting of a seat pad and a seat cover that encases the seat pad is divided into three parts in the seat width direction. Specifically, the cushion body is divided into a main top plate that forms the center 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 and each side top plate are individually fixed to the seat frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-33005 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, the main top plate and each side top plate are bolted to the seat frame from the back side of the seat. Therefore, when removing the main top plate from the seat frame, the seat cushion must first be removed from the vehicle, which is inefficient. Therefore, the present invention provides a seat cushion in which the main top plate, which has a structure separate from each side top plate, can be easily attached and detached to the seat frame. [Means for solving the problem]

[0005] To solve the above problems, the seat cushion of the present invention employs the following means.

[0006] That is, the first invention of the present invention is a seat cushion having a cushion body that elastically supports a seat occupant and a seat frame that supports the cushion body from the underside of the seat, wherein the cushion body is composed 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 main pad that forms a seat pad and a main base material attached to the back surface of the main pad, and each side top plate has a side pad that forms a seat pad and a side base material attached to the back surface of the side pad and fixed to the seat frame, and the seat cushion has a first fitting portion between the main base material and each side base material that is fitted to each other in the seat height direction by inserting the main base material from above the seat, and a second fitting portion that snap-fits the main base material from the front side of the seat so that the main base material cannot move in the seat above the side base material by the insertion.

[0007] According to the first aspect of the present invention, the main table top can be attached to each side table top from above the seat, preventing it from easily coming off during use. Specifically, by inserting the main base material into each side table top from above the seat, the first fitting portion fits the main base material to each side table top in the seat height direction, while the second fitting portion fits the main base material so that it does not come off in the seat above direction. By pulling the main base material toward the front of the seat, the snap-fit ​​engagement of the second fitting portion can be released, allowing the main table top to be removed in the seat above direction. Therefore, the main table top, which has a structure separate from each side table top, can be easily attached to and detached from the seat frame.

[0008] The second invention of the present invention is a seat cushion according to the first invention, wherein the first fitting portion and the second fitting portion are formed between a main side fitting portion formed on the main base material and a 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 so as to extend beyond the dividing line between the main top plate and each of the side top plates toward the inside in the seat width direction, and fits with the main side fitting portion directly below the main top plate.

[0009] According to the second aspect of the present invention, after assembling each side top plate to the seat frame, the main top plate can be easily attached by pushing it between them from above the seat. Also, the main top plate can be easily removed from the seat frame without removing each side top plate from the seat frame.

[0010] A third aspect of the present invention is a seat cushion according to the second aspect, wherein the first fitting portion has a concave-convex fitting structure consisting of a convex portion formed on the main base material and protruding downward from the seat, and a concave portion formed on each of the side base materials and opening upward from the seat, and the second fitting portion has a claw fitting structure consisting of a fitting hole formed on the main base material and penetrating in the front-to-rear direction of the seat, and a fitting claw formed on each of the side base materials and protruding forward from the seat.

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

[0012] A fourth invention of the present invention is a seat cushion according to any one of the first to third inventions, wherein the main base material further has a frame hooking claw that is snap-fitted from the front of the seat so that the insertion prevents the main base material from moving upward relative to the seat frame.

[0013] According to the fourth aspect of the present invention, the main top plate can be attached by simply inserting it into the seat frame from above the seat, so that it will not easily come off during use. Furthermore, the main top plate can be released from its engagement with the seat frame and made removable in the above-seat direction by pulling the main base material toward the front of the seat, similar to the operation of releasing the engagement of the second engagement portion. Therefore, the main top plate can be easily attached to and detached from the seat frame.

[0014] A fifth invention of the present invention is a seat cushion according to any one of the first to third inventions, wherein the seat frame has a pair of lower arms in the seat width direction that support the rear portion of the cushion body from the back side of the seat, and a tilt frame that is connected between the pair of lower arms so as to be position adjustable in the seat height direction around a tilt axis that extends in the seat width direction and supports the front portion of the cushion body from the back side of the seat, and each of the side base materials is fixed to the tilt frame.

[0015] According to the fifth aspect of the present invention, the main top plate and each side top plate can be attached to the seat frame having the tilt frame so as to appropriately follow the tilting movement.

[0016] A sixth aspect of the present invention is a seat cushion according to the fifth aspect of the present invention, wherein the main base material has a base material front portion that extends in an inverted U-shape in plan view along a pair of tilt arms in the seat width direction that are connected to the pair of lower arms of the tilt frame and an upper surface of a tilt panel that extends in the seat width direction between the front portions of the tilt arms, a base material rear portion that extends in a U-shape in plan view along the pair of lower arms and an upper surface of a rear pipe that extends in the seat width direction between the rear portions of the lower arms, and a flexible portion that connects both ends of the inverted U-shape of the base material front portion to both ends of the U-shape of the base material rear portion so that the flexible portion can follow the movement of the tilt frame.

[0017] According to the sixth aspect of the present invention, even if the main base material is provided in a shape that is continuously connected to the movable part and the fixed part in a frame shape in a plan view with respect to the seat frame that performs the tilting operation, it can be configured to appropriately follow the tilting operation. Therefore, the main base material can be configured as a single part without being divided, and the number of parts and the number of assembly steps can be appropriately reduced. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view illustrating a schematic configuration of a seat cushion according to a first embodiment. [Figure 2] FIG. [Figure 3] FIG. 10 is a perspective view showing the state in which each top plate side is attached to the cushion frame. [Figure 4] FIG. [Figure 5] FIG. 4 is a plan view of FIG. 3. [Figure 6] FIG. 4 is a perspective view showing the main top plate of FIG. 3 only as a main base material. [Figure 7] FIG. 10 is a perspective view showing a state in which the main base material is fitted to the cushion frame and each side base material. [Figure 8] FIG. 8 is a cross-sectional view taken along a vertical plane along part VIII in FIG. 7. [Figure 9] 9 is a view taken along the arrow IX in FIG. 6. [Figure 10] 8 is a cross-sectional view taken along a vertical plane at the X portion of FIG. 7. [Figure 11] FIG. 8 is a plan view of FIG. [Figure 12] 9 is a cross-sectional view corresponding to FIG. 8, illustrating the structure of a main part of a seat cushion according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0020] First Embodiment (Schematic configuration of seat cushion 1) First, the configuration of a seat cushion 1 according to a first embodiment of the present invention will be described with reference to Figures 1 to 11. In the following description, when directions such as front, back, up, down, left, and right are indicated, they refer to the directions shown in each figure.

[0021] Furthermore, when a direction, such as the "seat width direction," is indicated with the word "seat," it refers to the respective direction relative to the seat cushion 1. Furthermore, in the following description, when a specific reference drawing is not shown or when there is no reference symbol corresponding to the reference drawing, any of Figures 1 to 11 will be referred to as appropriate.

[0022] As shown in Fig. 1, a seat cushion 1 according to this embodiment is configured as a seating portion of an automobile seat. As shown in Fig. 2, the seat cushion 1 has 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 the back side (underside) of the seat.

[0023] The cushion body 2 is divided into three separate elements: a main top plate 2A that forms the center portion in the seat width direction, and side top plates 2B that form both side portions in the seat width direction. The cushion frame 3 is made of metal members assembled into a frame shape in a plan view. Here, the cushion frame 3 corresponds to the "seat frame" of the present invention.

[0024] As described above, the cushion body 2 is divided into the main top plate 2A and each side top plate 2B, which allows parts to be replaced according to the specifications of each divided element. The main top plate 2A and each side top plate 2B can be easily assembled to the cushion frame 3 by simply accessing them from above the seat.

[0025] 3, specifically, each side table top 2B is configured to be integrally fixed to the cushion frame 3 by fastening with bolts (not shown). On the other hand, after each side table top 2B is assembled to the cushion frame 3, the main table top 2A is inserted between them from above the seat, and is snap-fitted to them to fix the position.

[0026] More specifically, by the above-mentioned insertion, the main top plate 2A is snap-fitted to both the side top plates 2B and the cushion frame 3. As a result, the main top plate 2A is assembled to these in a state where it is restricted from slipping out in the upper direction of the seat (assembled state shown in FIG. 1).

[0027] The fitting state (see Fig. 1) of the main table top 2A with the side table tops 2B and the cushion frame 3 can be removed by a simple operation in which an operator puts his / her hand on the front part of the main table top 2A from below and pulls it toward the front of the seat. This operation of pulling the front part of the main table top 2A toward the front of the seat is different from the operation of removing the main table top 2A toward the upper part of the seat.

[0028] Therefore, the main top panel 2A can be attached to the cushion frame 3 in such a way that it will not easily come off during use. Moreover, anyone who knows how to remove and attach the main top panel 2A can easily remove and reattach the main top panel 2A.

[0029] (Cushion Frame 3 Configuration) The specific configuration of each part of the seat cushion 1 will be described in more detail below. First, the configuration of the cushion frame 3 will be described. As shown in Fig. 2, the cushion frame 3 has a pair of left and right elongated lower arms 3A extending in the front-rear direction of the seat along both left and right sides of the seat cushion 1.

[0030] The cushion frame 3 also has a tilt frame 3B connected to bridge the front portions of the lower arms 3A in the seat width direction, and a rear pipe 3C connected to bridge the rear portions of the lower arms 3A 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 in an inverted U-shape in a plan view and has a pair of left and right tilt arms B8 extending in the seat front-rear direction along each lower arm 3A, and a tilt panel B9 integrally spanning between the front portions of the tilt arms B8.

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

[0033] The tilt frame 3B is operated by receiving a driving force from a drive unit (not shown) connected between the lower arms 3A. Specifically, by receiving a driving force from the drive unit, the tilt frame 3B is rotated around each tilt shaft B7, and the position of the tilt frame 3B in the seat height direction relative to each lower arm 3A is adjusted.

[0034] The cushion frame 3 supports the rear portion of the cushion body 2 at a fixed position from the back side (below side) of the seat using the lower arms 3A and rear pipe 3C described above. The cushion frame 3 also supports the front portion of the cushion body 2 from the back side (below side) of the seat using the tilt frame 3B described above so that the position can be adjusted in the seat height direction.

[0035] (Configuration of cushion body 2) Next, we will explain the configuration of the main top plate 2A and each side top plate 2B that make up the cushion body 2. As shown in Fig. 4, the main top plate 2A has a main pad A1 made of urethane foam, a main cover A2 made of fabric that covers the main pad A1, and a main base material A3 made of resin that is placed against the back side of the main pad A1.

[0036] The main cover A2 is placed over the main pad A1 from the front side. The front, rear, left, and right cover terminals of the main cover A2 are pulled into the back side of the main pad A1. The cover terminals of the main cover A2 are attached to the peripheral edges of the main base material A3, which is in contact with the back side of the main pad A1.

[0037] As a result, the main cover A2 is integrated with the main base material A3 so as to enclose the main pad A1 between the main cover A2 and the main base material A3, and as a result, the main base material A3 is fixed in contact with the back surface of the main pad A1 through the main cover A2.

[0038] Similarly, each side top panel 2B has a side pad B1 made of urethane foam, a fabric side cover B2 that covers the side pad B1, and a resin side base material B3 that is placed against the back side of the side pad B1.

[0039] Each side cover B2 covers the front side of the side pad B1. The front, rear, left, and right cover ends of each side cover B2 are pulled into the back side of the side pad B1. The cover ends of each side cover B2 are fastened to the peripheral edges of the side base material B3 that is in contact with the back surface of the side pad B1.

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

[0041] As shown in Fig. 2, the main table top 2A and each side table top 2B are individually assembled to the cushion frame 3 by accessing them from above the seat. Specifically, first, each side table top 2B is assembled to the cushion frame 3. The procedure is as follows.

[0042] First, the side base material B3 of each side table top 2B is set by clipping it onto both the left and right sides of each tilt frame 3B from above the seat, so that each side base material B3 is set in a state in which it is in contact with both the left and right sides of each tilt frame 3B and each lower arm 3A from above the seat.

[0043] Next, each side base material B3 is bolted to the portion of each tilt arm B8 that protrudes downward and inward, thereby fixing each side table top 2B integrally to the tilt frame 3B and setting it in a state where it is supported from the back side of the seat by the tilt frame 3B and each lower arm 3A, as shown in Figures 3 and 5.

[0044] After the above assembly, the main table top 2A is then assembled to the cushion frame 3. The procedure is as follows. As shown in FIG. 6, first, the main base material A3 of the main table top 2A is inserted from above the seat between the side table tops 2B assembled to the cushion frame 3. Note that FIG. 6 is a schematic diagram showing the main table top 2A with only the main base material A3.

[0045] Then, the rear portion 32 of the main base material A3 is dropped between the top panel sides 2B, and the multiple hooks 34 formed along the rear edge are fitted into the rear pipe 3C so as to grip the rear portion 32 from the front of the seat. This positions the rear portion 32 of the main base material A3 relative to the cushion frame 3.

[0046] Next, the base material front portion 31 of the main base material A3 is dropped onto the tilt frame 3B with the fitted rear pipe 3C as a fulcrum. As a result, as shown in Fig. 7, each of the main-side fitting portions A4 (see Fig. 8) formed on both left and right ends of the front end portion of the main base material A3 is fitted into each of the side-side fitting portions B4 protruding inward in the seat width direction from the front end portion of each of the side base materials B3.

[0047] 5, each side fitting portion B4 protrudes from each side base material B3 to the inside in the seat width direction beyond the dividing line L between the main top plate 2A and each side top plate 2B. As a result, each side fitting portion B4 is adapted to fit with the main-side fitting portion A4 directly below the main top plate 2A (see FIG. 6).

[0048] 7, in addition to the above-mentioned fitting, each of the frame hooking claws A7 (see FIG. 10) formed on the left and right sides of the front end of the main base material A3 is snap-fitted to the lower edge of the front end of the tilt panel B9 from the front of the seat. This fitting allows the main base material A3 to be attached to both the side base materials B3 and the cushion frame 3 in a state where it will not come off in the upper direction of the seat.

[0049] 8, a first fitting portion F1 is formed between each main-side fitting portion A4 and each side-side fitting portion B4, and the first fitting portion F1 is fitted to each other in the seat height direction by inserting the main base material A3 from the seat upward direction. Also, a second fitting portion F2 is formed between each main-side fitting portion A4 and each side-side fitting portion B4, and the second fitting portion F2 is snap-fit ​​fitted from the seat front direction by inserting the main base material A3 from the seat upward direction so that the main base material A3 cannot move in the seat upward direction relative to each side base material B3.

[0050] The first fitting portion F1 is formed by a concave-convex fitting structure consisting of a convex portion A5 (see FIG. 9) formed on each main-side fitting portion A4 and protruding downward from the seat, and a concave portion B5 formed on each side-side fitting portion B4 and opening upward from the seat. Each convex portion A5 has a round bar-like shape and protrudes downward from the bottom surface of the base material front portion 31 of the main base material A3. The second fitting portion F2 is formed by a claw fitting structure consisting of a rectangular fitting hole A6 formed on each main-side fitting portion A4 and penetrating in the front-to-rear direction of the seat, and a fitting claw B6 formed on each side-side fitting portion B4 and protruding forward from the seat. The fitting hole A6 is formed in a portion that hangs downward from the front edge of the base material front portion 31 of the main base material A3.

[0051] When the main base material A3 is inserted from above the sheet, the convex portion A5 of the first fitting portion F1 enters the concave portion B5 from above the sheet before the fitting claw B6 of the second fitting portion F2 fits into the fitting hole A6. Also, with the insertion, each main-side fitting portion A4 comes into contact with each fitting claw B6 and is bent forward.

[0052] Then, after the convex portion A5 fits into the concave portion B5, the main base material A3 is further inserted downward in the seat, aligning the fitting hole A6 with the front side of the fitting claw B6. As a result, the main-side fitting portion A4 undergoes restoration deformation, and the fitting hole A6 snap-fits into the fitting claw B6 from the front of the seat. The fitting claw B6 has a shape that protrudes in the front direction of the seat in the shape of a right triangle in a side view.

[0053] More specifically, the fitting claw B6 has a protruding right-angled triangle shape, with its bottom surface, against which the lower edge of the fitting hole A6 abuts, being a flat surface facing straight downward in the seat, and its upper surface being an inclined surface sloping downward in the front. Therefore, by having the lower edge of the fitting hole A6 abut against the bottom surface of this fitting claw B6 through snap-fit ​​engagement, movement of the main-side fitting portion A4 in the seat upward direction relative to the side-side fitting portion B4 is restricted.

[0054] As a result, the main base material A3 is assembled to each side base material B3 in a state where it is prevented from coming off in the upward direction of the seat. This fitted state of the main base material A3 to each side base material B3 can be released by an operator placing their hands from below on the portions of the main base material A3 that hang down from the front edge of the base material front part 31 in the downward direction of the seat and pulling each main-side fitting part A4 in the forward direction of the seat.

[0055] Specifically, by pulling each main-side fitting portion A4 toward the front of the seat from the above-described fitted state, the fitting hole A6 of each main-side fitting portion A4 is disengaged from each fitting claw B6 toward the front of the seat. As a result, each main-side fitting portion A4 is released from the snap-fit ​​fitted state with each side-side fitting portion B4 and can be moved toward the upper side of the seat. Therefore, by moving the main base material A3 toward the upper side of the seat from this state, the main base material A3 can be removed from each side base material B3 in the upper side of the seat.

[0056] In practice, the main substrate A3 is inserted into each side substrate B3 from above the seat, and as described above in Figure 7, the frame hooking claws A7 formed at two locations on the left and right of its front end are snap-fit ​​into the lower edge of the front end of the tilt panel B9 from the front of the seat (see Figure 10).

[0057] Similar to the snap-fit ​​fittings at both the left and right ends described above, this snap-fit ​​fitting can be released by an operator placing their hands on the portion of the main base material A3 that hangs downward from the front edge of the base material front portion 31 from below and pulling it forward toward the front of the seat. Therefore, by releasing this fitting and moving the main base material A3 upward in the seat, the main base material A3 can be removed upward in the seat from each side base material B3 and cushion frame 3.

[0058] 6 and 11, the main base material A3 is formed in a frame shape in plan view that extends along the cushion frame 3 that is assembled in a frame shape in plan view. Specifically, the main base material A3 has a base material front portion 31 that extends in an inverted U shape in plan view along the upper surface of the tilt panel B9 and the inside of the front region of each lower arm 3. The front edge of the base material front portion 31 is shaped to hang down toward the seat bottom so as to cover the tilt panel B9 from the front of the seat (see FIG. 6).

[0059] The main base material A3 also has a base material rear portion 32 that extends in a U-shape in plan view along the inside of the rear region of each lower arm 3A and the upper surface of the rear pipe 3C. The main base material A3 also has a bellows-shaped flexible portion 33 that flexibly connects both ends of the inverted U-shape of the base material front portion 31 to both ends of the U-shape of the base material rear portion 32.

[0060] The flexible portion 33 has a bellows structure that connects each end of the base material front portion 31 to each end of the base material rear portion 32 so that it can follow the movement of the tilt frame 3B by bending. With this configuration, the main base material A3 can appropriately follow the movement of the tilt frame 3B even when its entire periphery is supported by the cushion frame 3 from the back side (underside) of the seat.

[0061] Therefore, the main substrate A3 can be provided so as to widely support the main pad A1 from the back side of the pad. Furthermore, the main substrate A3 can be configured as a single component by connecting the substrate front portion 31 and the substrate rear portion 32 together, rather than being formed as separate components, thereby appropriately reducing the number of components and assembly steps.

[0062] To summarize the above, the seat cushion 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.

[0063] That is, the seat cushion (1) has a cushion body (2) that elastically supports the seated occupant and a seat frame (3) that supports the cushion body (2) from the back side of the seat. The cushion body (2) is composed of three divided elements: a main top plate (2A) that forms the center part in the seat width direction, and each side top plate (2B) that forms both side parts in the seat width direction. The main top plate (2A) has a main pad (A1) that forms the seat pad, and a main base material (A3) that is attached to the back side of the main pad (A1).

[0064] Each top side (2B) has a side pad (B1) forming a seat pad, and a side base material (B3) attached to the back surface of the side pad (B1) and fixed to the seat frame (3). Between the main base material (A3) and each side base material (B3), a first fitting portion (F1) is formed, which is fitted to each other in the seat height direction by inserting the main base material (A3) from the seat upper direction, and a second fitting portion (F2) is formed, which is snap-fitted to fit the main base material (A3) from the seat front direction by the above insertion so that the main base material (A3) cannot move in the seat upper direction relative to each side base material (B3).

[0065] According to the above configuration, the main top plate (2A) can be attached to each side top plate (2B) simply by inserting it from above the seat, preventing it from easily coming off during use. Specifically, by inserting it, the main base material (A3) can be fitted to each side base material (B3) in the seat height direction by the first fitting portion (F1), and can be fitted to prevent it from coming off in the seat upward direction by the second fitting portion (F2). By pulling the main base material (A3) forward of the seat, the second fitting portion (F2) can be released from the snap-fit ​​fitting state, allowing the main top plate (2A) to be removed in the seat upward direction. Therefore, the main top plate (2A), which has a structure separate from each side top plate (2B), can be easily attached to and detached from the seat frame (3).

[0066] The first and second mating portions (F1) and (F2) are formed between a main mating portion (A4) formed on the main substrate (A3) and a side mating portion (B4) formed on each side substrate (B3). Each side mating portion (B4) protrudes from each side substrate (B3) beyond the dividing line (L) between the main top plate (2A) and each side top plate (2B) toward the inside in the seat width direction, and mated with the main mating portion (A4) directly below the main top plate (2A).

[0067] According to the above configuration, after assembling each of the side top panels (2B) to the seat frame (3), the main top panel (2A) can be easily attached between them by pushing it in from above the seat. Also, only the main top panel (2A) can be easily removed from the seat frame (3) without removing each of the side top panels (2B) from the seat frame (3).

[0068] Furthermore, the first fitting portion (F1) has a concave-convex fitting structure consisting of a convex portion (A5) formed on the main substrate (A3) and protruding downward from the seat, and a concave portion (B5) formed on each side substrate (B3) and opening upward from the seat. The second fitting portion (F2) has a claw fitting structure consisting of a fitting hole (A6) formed on the main substrate (A3) and penetrating in the front-rear direction of the seat, and a fitting claw (B6) formed on each side substrate (B3) and protruding forward from the seat. With this configuration, the first fitting portion (F1) and the second fitting portion (F2) can be configured relatively simply between the main substrate (A3) and each side substrate (B3).

[0069] The main base material (A3) further includes a frame hooking claw (A7) that is snap-fitted from the front of the seat so that the insertion prevents the main top plate (2A) from moving upward relative to the seat frame (3). According to the above configuration, the main top plate (2A) can be attached to the seat frame (3) simply by inserting it from the upper side of the seat, preventing it from easily coming off during use. Furthermore, the main top plate (2A) can be released from its engagement with the seat frame (3) by pulling the main base material (A3) toward the front of the seat, similar to the operation of releasing the engagement of the second engagement portion (F2), allowing it to be removed upward. Therefore, the main top plate (2A) can be easily attached to and detached from the seat frame (3).

[0070] The seat frame (3) also has a pair of lower arms (3A) in the seat width direction that support the rear portion of the cushion body (2) from the seat backside, and a tilt frame (3B) that is connected to the pair of lower arms (3A) so that its position can be adjusted in the seat height direction around a tilt shaft (B7) that extends in the seat width direction between the pair of lower arms (3A) and supports the front portion of the cushion body (2) from the seat backside. Each side base material (B3) is fixed to the tilt frame (3B). According to the above configuration, the main top plate (2A) and each side top plate (2B) can be attached to the seat frame (3) equipped with the tilt frame (3B) so that they can appropriately follow the tilt operation.

[0071] The main base material (A3) also has a base material front portion (31) that extends in an inverted U-shape in plan view along a pair of tilt arms (B8) in the seat width direction that are connected to the pair of lower arms (3A) of the tilt frame (3B) and along the upper surface of a tilt panel (B9) that extends in the seat width direction between the front portions of the tilt arms (B8). The main base material (A3) also has a base material rear portion (32) that extends in a U-shape in plan view along the pair of lower arms (3A) and along the upper surface of a rear pipe (3C) that extends in the seat width direction between the rear portions of the lower arms (3A).

[0072] The main base material (A3) also has flexible sections (33) that connect both ends of the inverted U-shape of the base material front section (31) to both ends of the U-shape of the base material rear section (32) so that the flexible sections can follow the movement of the tilt frame (3B). According to the above configuration, even if the main base material (A3) is continuously connected to the seat frame (3) that performs the tilting movement, spanning the movable section and the fixed section in a frame-like shape in a plan view, it can be configured to appropriately follow the tilting movement. Therefore, the main base material (A3) can be configured as a single part without being divided, thereby appropriately reducing the number of parts and assembly man-hours.

[0073] Second Embodiment Next, the configuration of the seat cushion 1 according to the second embodiment will be described with reference to Fig. 12. In this embodiment, the first fitting portion F1, which fits each main-side fitting portion A4 and each side-side fitting portion B4 to each other 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 portions A5 (see FIGS. 8 and 9) formed on each main-side fitting portion A4 shown in the first embodiment, the first fitting portion F1 is formed by a concave-convex fitting structure consisting of clips CL attached to each main-side fitting portion A4 and through-holes H formed in each side-side fitting portion B4 and opening toward the seat. Here, each clip CL corresponds to a "convex portion" in the present invention. Also, each through-hole H corresponds to a "concave portion" in the present invention.

[0075] Each clip CL is made of a metal leaf spring that protrudes downward from the bottom surface of the front base material 31 of the main base material A3 in an inverted Ω shape in a side view. When the main base material A3 is inserted from above the seat, each clip CL is pushed from above the seat into a through-hole H formed in each side fitting portion B4 while undergoing elastic deformation.

[0076] Specifically, each clip CL is inserted into the through-hole H so that the bulges at the front and rear of the Ω shape are compressed as the main base material A3 is inserted. Each clip CL is inserted into the through-hole H until the bulges of the Ω shape extend beyond the through-hole H in the downward direction of the seat.

[0077] As a result, each clip CL is snap-fitted to the lower edge of each through-hole H so that it is difficult for it to come out in the upward direction of the sheet due to the elastic force that restores the bulging portion at a position beyond the through-hole H in the downward direction of the sheet. More specifically, each clip CL is snap-fitted so that both upper slopes on the base side of the bulging portion abut obliquely from below against the lower edge of each through-hole H. This fitting makes it possible to fit the main base material A3 to each side base material B3 so that it is difficult for it to rattle in the height direction of the sheet.

[0078] The resilient force acting on each through-hole H of each clip CL is set to a strength that allows the worker to easily remove the main base material A3 by applying a force that pulls it upward toward the sheet. Therefore, the attachment and removal work can be easily performed. Since the configuration other than the above is the same as the configuration shown in the first embodiment, the same reference numerals are used and the description will be omitted.

[0079] Other Embodiments Although the present invention has been described above using two embodiments, the present invention can be embodied in various forms other than the above embodiments.

[0080] 1. The seat cushion of the present invention may be applied to seats of vehicles other than automobiles, such as trains, airplanes, ships, etc. Furthermore, the seat cushion may be applied to seats for non-vehicles installed in various facilities other than vehicles, such as sports facilities, theaters, concert halls, and event venues.

[0081] 2. The second fitting portion may be configured such that a fitting claw protruding toward the rear of the seat is formed on the main base material, and a fitting hole that receives the fitting claw from the front of the seat is formed on each side base material. Also, the second fitting portion may be configured as a fitting structure of claws that are snap-fitted together.

[0082] 3. The seat frame may not have a tilt frame and may support the cushion body in a fixed position from the back (underside) of the seat. The main cover and / or side cover may be made of fabric or leather. The main base material and / or side base material may be made of resin or metal. The main base material may be configured to be attached to the back surface of the main pad by adhesion or integral molding. Similarly, the side base material may be configured to be attached to the back surface of the side pad by adhesion or integral molding.

[0083] 4. The main substrate may be configured as two separate parts: a front substrate and a rear substrate. Furthermore, if the main substrate has a flexible part that connects the front substrate and the rear substrate so that they can follow the movement of the tilt frame, the flexible part may be configured as an accordion-shaped part or an integral hinge. Alternatively, the flexible part may be configured by inserting a separate member, such as a leaf spring, between the front substrate and the rear substrate. [Explanation of symbols]

[0084] 1 seat cushion 2 cushion body 2A Top plate main A1 Main Pad A2 main cover A3 main substrate 31 Front of substrate 32 Back of substrate 33 Flexible section 34 Hook part A4 Main side mating part A5 convex part A6 mating hole A7 Frame Hook Claw 2B Top board side B1 Side Pad B2 side cover B3 Side substrate B4 Side mating part B5 recess B6 Interlocking claws 3 Cushion frame (seat frame) 3A Lower arm 3B Tilt Frame B7 Tilt Axis B8 Tilt Arm B9 Tilt Panel 3C rear pipe F1 First fitting part F2 Second fitting part L dividing line CL clip (protruding part) H Through hole (recess)

Claims

1. A seat cushion 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 each side top plate forming both side portions in the seat width direction; The main top plate has a main pad that forms a seat pad and a main base material attached to a back surface of the main pad, Each of the top panel sides has a side pad that forms a seat pad, and a side base material that is attached to a back surface of the side pad and fixed to the seat frame, A seat cushion having a first fitting portion between the main base material and each of the side base materials, which is fitted to each other in the seat height direction by inserting the main base material from above the seat, and a second fitting portion which snap-fits the main base material from the front of the seat so that the main base material cannot move above the seat relative to each of the side base materials by the insertion.

2. 2. The seat cushion according to claim 1, the first fitting portion and the second fitting portion are formed between a main-side fitting portion formed on the main substrate and a side-side fitting portion formed on each of the side substrates, Each of the side fitting portions protrudes from each of the side base materials beyond the dividing line between the main top plate and each of the side top plates toward the inside in the seat width direction, and the seat cushion fits with the main side fitting portion directly below the main top plate.

3. 3. The seat cushion according to claim 2, The first fitting portion has a concave-convex fitting structure including a convex portion formed on the main base material and protruding in a seat downward direction, and a concave portion formed on each of the side base materials and opening in a seat upward direction, The seat cushion has a claw fitting structure in which the second fitting portion is formed in the main base material and penetrates in the front-to-rear direction of the seat, and the claws are formed in each of the side base materials and protrude in the front direction of the seat.

4. The seat cushion according to any one of claims 1 to 3, The seat cushion further includes a frame hooking claw that is snap-fitted from the front of the seat so that the main base material cannot move upward relative to the seat frame by the insertion.

5. The seat cushion according to any one of claims 1 to 3, the seat frame includes a pair of lower arms in the seat width direction that support a rear portion of the cushion body from the seat backside, and a tilt frame that is connected between the pair of lower arms so as to be position adjustable in the seat height direction around a tilt shaft that extends in the seat width direction and supports a front portion of the cushion body from the seat backside, The seat cushion has each of the side base materials fixed to the tilt frame.

6. 6. The seat cushion according to claim 5, the main base material has a base material front portion that extends in an inverted U-shape in plan view along a pair of tilt arms in the seat width direction that are connected to the pair of lower arms of the tilt frame and an upper surface of a tilt panel that extends in the seat width direction between front portions of the tilt arms; a base material rear portion that extends in a U-shape in plan view along the pair of lower arms and an upper surface of a rear pipe that extends in the seat width direction between rear portions of the lower arms; and a flexible portion that connects both ends of the inverted U-shape of the base material front portion to both ends of the U-shape of the base material rear portion so that the flexible portion can follow the movement of the tilt frame.

Images