Cushion body

Abstract

To provide a cushion body capable of appropriately reducing a press-fitting load for fixing a terminal of a seat cover to a pad reverse face of a seat pad.SOLUTION: A cushion body 1 having a seat pad 2 and a seat cover 3 for covering the seat pad 2 includes a fastening groove 2A formed on a pad reverse face of the seat pad 2 and a fastener 4 sewn to a terminal 3A of the seat cover 3 and press-fitted into the fastening groove 2A. A groove wall of the fastening groove 2A includes a convex groove wall A1 protruding so as to form a press-fitting face of the fastener 4, and a concave groove wall A2 aligned with the convex groove wall A1 in a groove length direction, so as to avoid the abutment on the fastener 4.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cushion body, and more particularly to a cushion body having a seat pad and a seat cover that is placed over the seat pad. [Background technology]

[0002] Patent Document 1 discloses a structure for fixing the edge of a seat cover to the hard back surface of a seat pad. Specifically, a fastener with an arrowhead-shaped barb is sewn to the edge of the seat cover. The seat cover is fixed to the back surface of the pad by press-fitting the fastener at the edge into a fastening groove formed on the back surface of the seat pad. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-2780 Summary of the Invention [Problem to be solved by the invention]

[0004] The configuration described in Patent Document 1 has a problem in that the fastening device is long and extends along the edge of the seat cover, which increases the press-fit load on the fastening groove. Therefore, the present invention provides a cushion body that can appropriately reduce the press-fit load required to fix the edge of the seat cover to the back surface of the seat pad. [Means for solving the problem]

[0005] As a means for solving the above problems, the cushion body of the present invention employs the following means.

[0006] That is, the first invention of the present invention is a cushion body having a seat pad and a seat cover that is placed over the seat pad, the cushion body having a fastening groove formed on the back surface of the seat pad and a fastening device that is sewn to an end of the seat cover and pressed into the fastening groove, the groove wall of the fastening groove having a convex groove wall that protrudes to form a press-fit surface for the fastening device, and a concave groove wall that is aligned with the convex groove wall in the groove length direction and is concave to avoid contact with the fastening device.

[0007] According to the first aspect of the present invention, when the fastener is press-fitted into the fastening groove, the fastener can be press-fitted by abutting only against the convex groove wall without abutting against the concave groove wall, which reduces the contact area of ​​the fastener with the groove wall and reduces the press-fit load.

[0008] A second aspect of the present invention is the cushion body according to the first aspect, wherein a plurality of the convex groove walls are provided in the groove length direction.

[0009] According to the second aspect of the present invention, the fastener can be brought into contact with the convex groove wall at multiple points in the groove length direction, which allows the fastener to be brought into contact with the convex groove wall without being tilted within the fastening groove, thereby appropriately improving the ease of assembly and holding ability after assembly.

[0010] A third aspect of the present invention is the cushion body according to the first or second aspect of the present invention, wherein the convex groove walls are provided on both groove walls of the fastening groove.

[0011] According to the third aspect of the present invention, the fastener can be brought into partial contact with each of the groove walls, thereby more appropriately reducing the press-fit load of the fastener.

[0012] A fourth aspect of the present invention is the cushion body according to the third aspect, wherein the convex groove walls are provided at positions opposite both of the groove walls.

[0013] According to the fourth aspect of the present invention, the fastener can be held by being sandwiched between the convex groove walls located at opposing positions of both groove walls, thereby holding the fastener without tilting within the fastening groove.

[0014] A fifth aspect of the present invention is the cushion body according to the third aspect, wherein the convex groove walls provided on both groove walls are arranged so as not to overlap each other in the groove length direction.

[0015] According to the fifth aspect of the present invention, since the convex groove walls do not face each other, a large space can be secured between each convex groove wall and the opposing groove wall into which the fastener can be press-fitted, thereby improving the ease of assembling the fastener.

[0016] The sixth invention of the present invention is a cushion body according to the first or second invention, wherein the cross-sectional width of the fastener pressed into the fastening groove is greater than the minimum groove width that can be pressed into the fastening groove, which is narrowed by the protrusion of the convex groove wall of the fastening groove, and is smaller than the maximum groove width that can be widened by the recess of the concave groove wall.

[0017] According to the sixth aspect of the present invention, it is possible to appropriately avoid contact with the recessed groove wall while ensuring an appropriate engagement allowance of the fastener with the projecting groove wall, thereby reducing the press-fit load.

[0018] A seventh aspect of the present invention is a cushion body according to the sixth aspect, wherein the fastener has a plurality of arrowhead-shaped barbs in the press-fitting direction that are hooked onto the convex groove wall when pressed into the fastening groove.

[0019] According to the seventh aspect of the present invention, the fastener can be fixed in the fastening groove in a state where it is appropriately prevented from coming off, while reducing the press-fit load of the fastener. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a perspective view illustrating a schematic configuration of a cushion body according to a first embodiment. [Figure 2] FIG. 10 is a perspective view illustrating a state before the fastener is press-fitted into the fastener groove. [Figure 3] FIG. 10 is a bottom view of the fastening groove as seen from the back side of the pad. [Figure 4] 4 is a bottom view corresponding to FIG. 3, illustrating a state in which the fastener is press-fitted into the fastening groove. FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 10 is a bottom view illustrating a schematic configuration of a cushion body according to a second embodiment. [Figure 7] FIG. 10 is a bottom view illustrating a schematic configuration of a cushion body according to a third embodiment. [Figure 8] FIG. 10 is a bottom view illustrating a schematic configuration of a cushion body according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0022] First Embodiment (Schematic configuration of cushion body 1) First, the configuration of a cushion body 1 according to a first embodiment of the present invention will be described with reference to Figures 1 to 5. In the following description, when directions such as front, back, up, down, left, and right are indicated, they refer to the respective directions shown in each figure. In the following description, when a specific reference figure is not indicated or when there is no reference symbol corresponding to a reference figure, any of Figures 1 to 5 will be referenced as appropriate.

[0023] 1 and 2, a cushion body 1 according to this embodiment is applied to a seat cushion that forms the seating portion of an automobile seat. The cushion body 1 includes a seat pad 2 made of a foamed resin material and a fabric seat cover 3 that covers the seat pad 2.

[0024] The seat cover 3 is placed over the seat pad 2 from the front side of the pad. The front, rear, left and right ends 3A of the seat cover 3 are pulled into the back side of the pad and fixed to corresponding fastening grooves 2A formed on the back surface of the seat pad 2. Figures 1 and 2 show the seat pad 2 as viewed from the back side of the pad.

[0025] The seat pad 2 has a pad surface that supports the buttocks and thighs of the seated person and is made of polyurethane foam, while the pad back that forms the back surface of the seat pad 2 is made of polypropylene foam, which is harder than polyurethane foam.

[0026] The seat pad 2 has such a configuration that its soft surface can gently support the buttocks and thighs of the seated occupant, while its hard back surface can widely distribute and absorb the load applied by the seated occupant.

[0027] Furthermore, the seat pad 2 has an uneven shape (not shown) formed on the hard back surface of the pad to prevent the seat occupant's buttocks from sinking and sliding forward during a vehicle collision, which is known as the submarine phenomenon. The fastening grooves 2A are formed in a stripe-like shape on the back surface of the hard pad.

[0028] 2, each end 3A of the seat cover 3 is fixed by pressing a resin fastener 4 sewn to the end 3A into the corresponding fastener groove 2A from the back side of the pad. Each fastener 4 is made of a plate-like member extending along the end 3A of the seat cover 3.

[0029] In detail, each fastening device 4 consists of a plate-like member with a T-shaped cross section, which has a long, plate-like sewn portion 4A that is placed against and sewn to each end 3A of the seat cover 3, and a long, plate-like press-fit portion 4B that extends up from the center of the sewn portion 4A and is press-fit into each fastening groove 2A.

[0030] Arrowhead-shaped barbs B1 are formed at the tip and middle of the press-fit portion 4B to improve the catch on each fastening groove 2A after press-fitting. Each barb B1 is formed to protrude symmetrically at an angle in each direction from the press-fit portion 4B so as to catch on both groove walls of each fastening groove 2A. Each barb B1 is configured to protrude in the same shape from the press-fit portion 4B. Each fastener 4 is configured to extend with a uniform cross-sectional shape in the longitudinal direction (groove length direction).

[0031] Each fastening groove 2A is configured so that the corresponding fastener 4 can be pressed into it from the back side of the pad, thereby fixing the fastener 4 in a state where it will not come off. Each fastening groove 2A is configured so that the corresponding fastener 4 can be pressed into it with a relatively light force, even if the seat pad 2 that forms the groove walls is made of hard polypropylene foam.

[0032] The configuration of each fastening groove 2A and each fastener 4 press-fitted into the groove will be described in detail below using the configuration of one set shown in Fig. 2 as an example. The other sets of fastening grooves 2A and fasteners 4 have the same configuration.

[0033] As shown in Fig. 3, the fastening groove 2A does not have a flat groove wall extending in the groove length direction, but is formed in an uneven shape with bank-like convex groove walls A1 protruding in places. As shown in Figs. 4 and 5, these convex groove walls A1 are portions that form a press-fitting surface when the fastener 4 is press-fitted.

[0034] 3, the fastening groove 2A is formed as recessed groove walls A2 in which the other groove walls are recessed relative to the respective protruding groove walls A1 due to the formation of each protruding groove wall A1. The recessed groove walls A2 are formed to form flat surfaces that extend flush with each other in the groove length direction in the respective groove walls of the fastening groove 2A.

[0035] Each convex groove wall A1 is configured to protrude from each concave groove wall A2 in the same shape. Each convex groove wall A1 is formed in a horizontally elongated shape in which the protruding width in the groove length direction is greater than the protruding length. As shown in Figure 2, each convex groove wall A1 is formed to have a uniform cross-sectional shape over substantially the entire area in the groove depth direction of the fastening groove 2A.

[0036] As shown in Fig. 3, each groove wall of the fastening groove 2A has four convex groove walls A1, each of which is formed at two locations along the groove length. Each pair of convex groove walls A1 aligned along the groove length in each groove wall of the fastening groove 2A are spaced apart from each other along the groove length. The convex groove walls A1 formed on each groove wall of the fastening groove 2A are arranged opposite each other in the groove width direction.

[0037] The minimum groove width W2, which is the dimension between the convex groove walls A1 facing each other in the groove width direction, is smaller than the dimension between both ends of each barb B1, which is the maximum cross-sectional width W1 of the press-fit portion 4B of the fastener 4 shown in Figures 4 and 5. Also, as shown in Figure 4, the maximum groove width W3, which is the dimension between the concave groove walls A2 facing each other in the groove width direction formed on each groove wall of the fastening groove 2A, is larger than the cross-sectional width W1 of the fastener 4. The plate thickness of the press-fit portion 4B of the fastener 4 is smaller than the minimum groove width W2.

[0038] With this configuration, when the press-fit portion 4B of the fastener 4 is inserted into the groove, the barbs B1 of the fastener 4 are pressed against the inner surface of each convex groove wall A1 of the fastening groove 2A. Then, as shown in Fig. 5, when the press-fit portion 4B is pressed into the groove, the fastener 4 is pressed into the groove along the inner surface of each convex groove wall A1 while each barb B1 is elastically compressed by contact with the inner surface of each convex groove wall A1.

[0039] The press-fit portion 4B of the fastener 4 is press-fit into the fastening groove 2A until the sewn portion 4A is pressed against the pad back surface of the seat pad 2. As a result, the fastener 4 is fixed in a state in which each barb B1 is caught on the inner surface of each convex groove wall A1, and these act as wedges to restrict movement of the fastener 4 in the pull-out direction relative to the fastening groove 2A. As a result, the end 3A of the seat cover 3 sewn to the fastener 4 is fixed to the pad back surface of the seat pad 2.

[0040] 4, the fastener 4 is held in a state in which two portions in the groove length direction are pressed and sandwiched in the groove width direction by the four convex groove walls A1 described above, thereby holding the fastener 4 in the fastening groove 2A without tilting in the groove width direction.

[0041] The fastener 4 contacts only the convex groove walls A1 formed on portions of each groove wall of the fastening groove 2A, and does not contact the concave groove walls A2. This allows the fastener 4 to be press-fitted into the fastening groove 2A with a small press-fit load, compared to a configuration in which the fastener 4 contacts the groove walls of the fastening groove 2A over the entire length of the groove, thereby creating a large contact area. Furthermore, after being press-fitted, the fastener 4 is properly held in place by the wedging action of the two barbs B1, preventing it from being pulled out of the fastening groove 2A by the tension of the seat cover 3.

[0042] To summarize the above, the cushion body 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.

[0043] That is, the cushion body (1) has a seat pad (2) and a seat cover (3) that is placed on the seat pad (2). The cushion body (1) has a fastening groove (2A) formed on the back surface of the seat pad (2) and a fastener (4) that is sewn to an end (3A) of the seat cover (3) and press-fitted into the fastening groove (2A). The groove wall of the fastening groove (2A) has a protruding groove wall (A1) that protrudes to form a press-fit surface for the fastener (4), and a recessed groove wall (A2) that is aligned with the protruding groove wall (A1) in the groove length direction and recessed to avoid contact with the fastener (4).

[0044] According to the above configuration, when the fastener (4) is press-fitted into the fastening groove (2A), the fastener (4) can be press-fitted by abutting only the convex groove wall (A1) without abutting the concave groove wall (A2). As a result, the contact area of ​​the fastener (4) with the groove wall can be reduced, and the press-fitting load can be reduced.

[0045] In addition, a plurality of convex groove walls (A1) are provided in the groove length direction. According to the above configuration, the fastener (4) can be brought into contact with the convex groove walls (A1) at a plurality of locations in the groove length direction. As a result, the fastener (4) can be brought into contact with the convex groove walls (A1) without being tilted within the fastening groove (2A), thereby appropriately improving the ease of assembly and holding ability after assembly.

[0046] Furthermore, the convex groove walls A1 are provided on both groove walls of the fastening groove 2A. With this configuration, the fastener 4 can be partially abutted against each groove wall. As a result, the press-fit load of the fastener 4 can be more appropriately reduced.

[0047] In addition, the convex groove walls (A1) are provided at opposing positions of both groove walls. According to the above configuration, the fastener (4) can be held by being sandwiched between the convex groove walls (A1) at opposing positions of both groove walls. This makes it possible to hold the fastener (4) without tilting in the fastening groove (2A).

[0048] Furthermore, the cross-sectional width (W1) of the fastener (4) press-fitted into the fastening groove (2A) is larger than the minimum groove width (W2) that can be pressed, which is narrowed by the protrusion of the convex groove wall (A1) of the fastening groove (2A), and is smaller than the maximum groove width (W3) that is widened by the recess of the concave groove wall (A2). According to the above configuration, it is possible to appropriately avoid contact with the concave groove wall (A2) while ensuring an appropriate engagement allowance of the fastener (4) with the convex groove wall (A1), thereby reducing the press-fitting load.

[0049] In addition, the fastener (4) has a plurality of arrowhead-shaped barbs (B1) in the press-fitting direction that are hooked onto the convex groove wall (A1) when pressed into the fastening groove (2A). With the above configuration, the fastener (4) can be fixed in the fastening groove (2A) in an appropriate prevented-from-coming state while reducing the press-fitting load of the fastener (4).

[0050] Second Embodiment Next, the configuration of a cushion body 1 according to a second embodiment of the present invention will be described with reference to Fig. 6. In this embodiment, a total of three convex groove walls A1 are formed on each groove wall of the fastening groove 2A.

[0051] Specifically, two convex groove walls A1 are formed side by side in the groove length direction on one groove wall of the fastening groove 2A. And one convex groove wall A1 is formed on the other groove wall. This single convex groove wall A1 is formed so as to be located between two convex groove walls A1 formed on the opposing groove wall. More specifically, the two convex groove walls A1 formed on one groove wall and the one convex groove wall A1 formed on the other groove wall are arranged so as not to overlap with each other in the groove length direction.

[0052] In this way, by arranging the convex groove walls A1 so that they do not face each other in the groove width direction, it is possible to ensure a wide space between each convex groove wall A1 and the mating groove wall (concave groove wall A2) into which the fastener 4 can be press-fitted, thereby improving the ease of assembling the fastener 4. 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 detailed description will be omitted.

[0053] Third Embodiment Next, the configuration of a cushion body 1 according to a third embodiment of the present invention will be described with reference to Fig. 7. In this embodiment, a convex groove wall A1 is formed on each groove wall of the fastening groove 2A. The convex groove walls A1 are formed at positions facing each other in the groove width direction (positions where they are arranged overlapping in the groove length direction).

[0054] In this way, even in a configuration in which only one convex groove wall A1 is formed on each groove wall, the fastener 4 can be fixed by being pressed and sandwiched in the groove width direction by each convex groove wall A1. 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 detailed description will be omitted.

[0055] Fourth Embodiment Next, the configuration of a cushion body 1 according to a fourth embodiment of the present invention will be described with reference to Fig. 8. In this embodiment, one convex groove wall A1 is formed only on one groove wall of the fastening groove 2A, and the other groove wall is configured so that no convex groove wall A1 is formed (configuration of only concave groove wall A2).

[0056] The fastener 4 is configured to contact only the convex groove wall A1 on one side of the groove wall where the convex groove wall A1 is formed, and to contact the entire area in the groove length direction on the other side of the groove wall where the convex groove wall A1 is not formed. Even with this configuration, the contact area between the fastener 4 and the one side of the groove wall where the convex groove wall A1 is formed can be reduced, thereby reducing the press-fit load.

[0057] In this embodiment, since the convex groove wall A1 is present on only one groove wall, the minimum groove width W2 narrowed by the protrusion of the convex groove wall A1 of the fastening groove 2A is the dimension between the inner surface of the convex groove wall A1 and the opposite concave groove wall A2. 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 detailed description will be omitted.

[0058] Other Embodiments Although the present invention has been described above using four embodiments, the present invention can be embodied in various forms other than the above embodiments.

[0059] 1. The cushion body of the present invention can be applied not only to automobile seats but also to seats for vehicles other than automobiles, such as trains, etc. The cushion body can also be applied to seats used in vehicles other than automobiles, such as airplanes and ships.

[0060] The cushion body can be applied not only to vehicles but also to seats other than vehicles, such as seats installed in various facilities, such as sports facilities, theaters, concert halls, event venues, etc., and massage seats. The cushion body can also be applied to seat backs as well as seat cushions.

[0061] 2. The convex groove wall may protrude so as to form the press-fit surface of the fastener, and may protrude in the shape of a rectangular column, or in the shape of a semicircular, triangular, or trapezoidal column in cross section tapering toward the inside of the groove. The convex groove wall may also protrude in any shape, such as one in which the protruding end surface is curved in a wavy manner in the direction of the length of the groove.

[0062] The convex groove walls may be provided in numbers and arrangements other than those shown in the above embodiments. For example, multiple convex groove walls may be provided on only one of the groove walls, lined up in the groove length direction. Furthermore, three or more convex groove walls may be provided on each groove wall or on one of the groove walls, depending on the length of the fastening groove or fastener. When multiple convex groove walls are provided, the shapes and sizes of the convex groove walls do not necessarily have to be identical to each other. [Explanation of symbols]

[0063] 1 cushion body 2 seat pads 2A Fastening groove A1 Convex groove wall A2 groove wall 3 Seat covers 3A terminal 4 Fasteners 4A Suture section 4B Press-fit part B1 Return W1 Section width W2 Minimum groove width W3 Maximum groove width

Claims

1. A cushion body having a seat pad and a seat cover that covers the seat pad, a fastening groove formed on the back surface of the seat pad; a fastener that is sewn to an end of the seat cover and press-fitted into the fastening groove, The cushion body has a groove wall of the fastening groove that has a convex groove wall that protrudes to form a press-fit surface for the fastener, and a concave groove wall that is aligned with the convex groove wall in the groove length direction and is concave to avoid contact with the fastener.

2. The cushion body according to claim 1, A cushion body in which a plurality of the convex groove walls are provided in the longitudinal direction of the groove.

3. The cushion body according to claim 1 or 2, The cushion body has the convex groove walls provided on both groove walls of the fastening groove.

4. The cushion body according to claim 3, The cushion body has the convex groove walls provided at positions opposite to both of the groove walls.

5. The cushion body according to claim 3, The cushion body is configured such that the convex groove walls provided on both groove walls do not overlap each other in the groove length direction.

6. The cushion body according to claim 1 or 2, A cushion body in which the cross-sectional width of the fastener pressed into the fastening groove is larger than the minimum groove width that can be pressed into the fastening groove, which is narrowed by the protrusion of the convex groove wall of the fastening groove, and smaller than the maximum groove width that can be widened by the recess of the concave groove wall.

7. The cushion body according to claim 6, The fastener has a cushion body having a plurality of arrowhead-shaped barbs in the press-fitting direction that are hooked onto the convex groove wall when pressed into the fastener groove.

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