Seat and upholstery fixing member

Abstract

To provide a seat of which a cover fabric can be stably fixed only by a fixing member, and the cover fabric fixing member.SOLUTION: A cover fabric fixing member 9 includes a cover fabric attachment portion 12 and a locking portion 13. The locking portion 13 is locked to a portion to be locked by an outer locking piece 17 and an inner locking piece 18 sandwiching the portion to be locked, whereby tension of the cover fabric is generated. Due to the tension, an inner protrusion 20 of the inner locking piece 18 is pressed against an inner face of the portion to be locked and serves as a fulcrum, and a convex portion 19 at a fore end of the outer locking piece 17 is pressed against an outer face of the portion to be locked, receives reaction force from the outer face and serves as a point of effort, whereby the convex portion 19 receives reaction force so that rotational moment due to the tension of the cover fabric and rotational moment due to acting force acting on the cover fabric attachment portion 12 balance out.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sheet whose skin covers the front surface of a base, and a skin fixing member.

Background Art

[0002] Conventionally, a seat attached to a vehicle such as an automobile has a structure in which a skin covers the front surface of a base, and an end portion of the skin is locked to the base by a locking member.

[0003] For example, when locking an end portion of a skin to a resin base with an end locking member such as a clip at an upper portion above an armrest storage portion in the middle of a three-row rear seat of a vehicle (see, for example, FIG. 1), a fixing structure using a clip 43 shown in FIG. 14 is known. In this fixing structure, at a base 41 above Z1 in an armrest storage portion 40 for storing an armrest AR, an end portion of a skin 42 covering the front surface side X1 of the base 41 is spot-fixed (i.e., pin-point locked) to the lower portion of the base 41 using a clip 43. Therefore, the clip 43 is likely to come off due to the tensile force of the skin 42, and it is difficult to keep the tension of the skin 42 constant. In addition, since a hole for clip locking is provided in the skin 42, a parting line is formed. Therefore, with this skin fixing structure, there are appearance defects and a high possibility that the locking member will come off.

[0004] Also, as a locking member having a larger locking area than a clip, a fixing structure using a cover finisher having a J-shaped cross section that can be surface-fixed is known. In this fixing structure, the cover finisher is fixed to an end portion of the skin, and the cover finisher is locked to a slit formed in the base. However, in this fixing structure, a slit for locking the cover finisher to the base is required, and a member for hiding the slit is separately required. Therefore, with this skin fixing structure, there are appearance defects, an increase in manufacturing cost, and further poor convenience.

[0005] To solve the above problems (defective appearance and maintenance of locking state), there is a need for a skin fixing structure that can maintain the locking state of the edges of the skin without increasing the number of parts or causing defects in appearance.

[0006] For example, the skin fixing structure shown in Figure 15 is known from Patent Document 1. In the seat shown in Figure 15, a seat cushion 90 is attached to a frame 71, and the surface of the seat cushion 90 is covered with a skin 80. The ends of the skin 80 are fixed to the lower edge 71a of the frame 71 by fixing members 50, and the space below the seat cushion 90 is covered by a cover member 60, so that the fixing points of the ends of the skin are not visible from the outside.

[0007] The fixing member 50 shown in Figure 15 is specifically a member with a Y-shaped cross-section, having an inner edge portion 51 positioned inside the frame 71, an outer edge portion 54 positioned outside, and a lower projection portion 52 projecting downward. The end of the skin 80 is sewn to the thin-walled portion 55 of the inner edge portion 51 at the stitching portion 55a. A locking piece 53 provided on the inner edge portion 51 engages with the lower edge portion 71a of the frame 71, and further, the fixing member 50 is locked to the lower edge portion 71a of the frame 71 by sandwiching the lower edge portion 71a between the inner edge portion 51 and the outer edge portion 54. The lower projection portion 52 engages with the upper end portion 61 of the cover member 60. Therefore, the fixing member 50 maintains the fixed state of the end of the skin 80 by engaging with the lower edge portion 71a of the frame 71 and by engaging with the upper end portion 61 of the cover member 60. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Patent No. 5196227 [Overview of the project] [Problems that the invention aims to solve]

[0009] However, in the skin fixing structure shown in Figure 15, when a strong tensile force A acts on the skin 80, the fixing member 50 rotates in the direction of arrow B, which may release the engagement between the locking piece 53 of the fixing member 50 and the lower edge 71a of the frame 71, as well as the engagement between the lower projection 52 and the upper end 61 of the cover member 60. Therefore, even in the structure shown in Figure 15, there is room for improvement in maintaining the locked state of the skin's edge.

[0010] This invention has been made in view of the above circumstances, and aims to provide a sheet and a surface fixing member that can stably fix the edge of the surface using only a fixing member without adding any additional parts. [Means for solving the problem]

[0011] To solve the aforementioned problems, the present invention provides a sheet comprising a base, a skin covering the front surface of the base, and a skin fixing member that fixes the end of the skin to the base at the rear edge of the base, wherein the base has a locking portion that protrudes to the rear side from the rear edge of the base, and the locking portion has an outer surface facing the outside of the base and an inner surface facing the inside, the end of the skin extends beyond the locking portion to the rear side of the base, the skin fixing member comprises a skin attachment portion to which the end of the skin is attached, and a locking portion that is positioned closer to the locking portion than the skin attachment portion and locks into the locking portion, the end of the skin is locked into the locking portion via the skin attachment portion, the locking portion has an outer locking piece that abuts against the outer surface of the locking portion and an inner locking piece that abuts against the inner surface of the locking portion, and the inner locking piece is The locking part has an inner projection that protrudes toward the inner surface of the locked part, the outer locking piece has a reaction force receiving portion at its tip that receives a reaction force from the outer surface of the locked part, the locking part is locked to the locked part by the outer locking piece and the inner locking piece sandwiching the locked part, the reaction force receiving portion is configured to receive a reaction force from the outer surface of the locked part with the inner projection as a fulcrum due to the tension of the skin, and the reaction force receiving portion is configured to receive the reaction force such that the rotational moment due to the tension of the skin received by the skin attachment portion with the inner projection as the center of rotation balances the rotational moment due to the force acting on the skin attachment portion.

[0012] According to this configuration, the sheet is equipped with a surface fixing member that secures the end of the surface to the base by engaging with a locking portion that protrudes from the rear edge of the base toward the rear side. This surface fixing member has a configuration that makes it difficult for the locking portion to come loose even when the surface attachment portion receives tension from the surface in the direction toward the front of the base. Specifically, the locking portion has an outer locking piece that abuts against the outer surface of the locking portion and an inner locking piece that abuts against the inner surface of the locking portion. The locking portion is locked to the locking portion while being sandwiched between the outer locking piece and the inner locking piece. The inner locking piece has an inner projection that protrudes toward the inner surface of the locking portion. The outer locking piece has a reaction force receiving portion at its tip that receives the reaction force from the outer surface of the locking portion.

[0013] The locking portion is locked to the locked portion by sandwiching it between the outer locking piece and the inner locking piece, thereby generating tension at the edge of the skin in a direction toward the front surface of the base. Due to this tension, the inner protrusion is pressed against the inner surface of the locked portion, becoming a fulcrum, and the reaction force receiving portion is pressed against the outer surface of the locked portion, receiving a reaction force from that outer surface and becoming the point of application of force. The reaction force receiving portion applies a force to the skin attachment portion in a direction perpendicular to the direction of tension and toward the locked portion, thereby receiving a reaction force such that the rotational moment due to the tension of the skin received by the skin attachment portion with the inner protrusion as the center of rotation balances the rotational moment due to the force acting on the skin attachment portion, which has become the point of application of the force.

[0014] Therefore, in this skin fixing member, the balance of two rotational moments acting on the skin attachment portion prevents the skin fixing member from rotating. As a result, the locking portion of the skin fixing member can maintain a state of being locked to the locked portion of the base by sandwiching it from the inside and outside with the outer locking piece and the inner locking piece, and the locking portion will not come off the locked portion. Therefore, since no additional retaining member is required for the locked portion in addition to the skin fixing member, it is possible to stably fix the edge of the skin using only the skin fixing member without adding any additional parts to the sheet.

[0015] In the sheet described above, it is preferable that the reaction force receiving portion is composed of a convex portion that protrudes from the tip of the outer locking piece toward the outer surface of the locked portion.

[0016] With this configuration, the reaction force receiving portion of the outer locking piece is made up of a protrusion that extends from the tip of the outer locking piece toward the outer surface of the locked portion. As this protrusion bites into the outer surface of the locked portion, it is possible to reliably receive the reaction force from that outer surface.

[0017] In the sheet described above, it is preferable that the reaction force receiving portion is configured such that the tip of the outer locking piece is inclined toward the outer surface of the locked portion with respect to the direction in which the surface attachment portion extends.

[0018] With this configuration, the reaction force receiving portion of the outer locking piece is configured such that the tip of the outer locking piece is inclined toward the outer surface of the locked portion with respect to the direction in which the skin attachment portion extends. As a result, this inclined tip bites into the outer surface of the locked portion, making it possible to reliably receive the reaction force from that outer surface.

[0019] In the sheet described above, it is preferable that the surface attachment portion has a flat portion that linearly guides the end of the surface toward the rear side.

[0020] With this configuration, the edges of the surface material follow the flat surface of the surface material attachment area, making it possible to maintain a uniform appearance in the sheet.

[0021] In the above-described sheet, it is preferable that the end of the surface material is secured by being wrapped around the surface material attachment portion.

[0022] With this configuration, since the edges of the skin are wrapped around and fixed to the skin attachment point, it is possible to firmly fix the edges of the skin to the skin attachment point. At the same time, the seam line between the edges of the skin and other components is clearly and neatly defined.

[0023] In the above sheet, it is preferable that the thickness of the skin attachment portion has a thickness that allows the end portion of the skin to be sewn to the skin attachment portion.

[0024] According to such a configuration, it becomes easier to sew the end portion of the skin to the skin attachment portion. At the same time, the joint line between the end portion of the skin and other members is more likely to appear clearly and neatly.

[0025] In the above sheet, the base body has an armrest storage portion for storing an armrest at a position adjacent to the outside of the end portion of the skin, and the skin fixing member is constituted by a long strip-shaped member extending in a second direction orthogonal to a first direction in which the skin attachment portion and the locking portion are arranged, and it is preferable that a slit formed by removing the locking portion is formed near the central portion of the strip-shaped member in the second direction.

[0026] According to such a configuration, a slit is formed near the central portion of the strip-shaped member that constitutes the skin fixing member in the direction (second direction) in which the strip-shaped member extends. For this reason, when a user of the sheet inserts a finger into the gap between the armrest and the end portion of the skin in order to take out the armrest from the armrest storage portion of the base body, the end portion of the skin bends inward of the base body at the slit portion of the skin fixing member, making it easier to insert the finger into the above gap, and so-called finger insertion property is improved. As a result, it becomes easier to easily take out the armrest from the armrest storage portion.

[0027] In the above sheet, the base body has an armrest storage portion for storing an armrest at a position adjacent to the outside of the end portion of the skin, and the skin fixing member further includes a connecting arm portion that connects between the skin attachment portion and the locking portion, and it is preferable that the connecting arm portion has a stepped portion that bends in a direction away from the end portion of the skin.

[0028] In this configuration, the connecting arm portion of the upholstery fixing member, which connects the upholstery attachment portion and the locking portion, has a stepped portion, and the stepped portion is curved away from the edge of the upholstery. Therefore, when a user of the seat inserts their fingers into the gap between the armrest and the edge of the upholstery in order to remove the armrest from the armrest storage portion of the base, the edge of the upholstery flexes inward at the stepped portion of the upholstery fixing member, making it easier to insert the fingers into the gap, thus improving the ease of finger insertion. This makes it easier to remove the armrest from the armrest storage portion.

[0029] In the sheet described above, it is preferable that the inner locking piece has an inclined surface that slopes away from the inner surface of the locked portion as it approaches the tip of the inner locking piece. With this configuration, when locking the locking portion of the skin fixing member to the locked portion, the locked portion is guided by the inclined surface of the inner locking piece, making it easier for the locking portion to be locked by sandwiching the locked portion between the inner locking piece and the outer locking piece. Therefore, the workability of locking the skin fixing member to the locked portion is improved.

[0030] In the sheet described above, it is preferable that the inner protrusion is located at the base of the inner locking piece.

[0031] With this configuration, when the skin attachment portion receives tension from the skin toward the front of the base, the inner projection positioned at the base of the inner locking piece is pressed against the inner surface near the tip of the locked portion. As a result, the inner projection makes more pinpoint contact with the inner surface of the locked portion and bites into it, making it less likely for the inner projection to shift, thus enabling it to function stably as a fulcrum. Consequently, the end of the skin can be fixed more stably.

[0032] In the sheet described above, it is preferable that the base further has an engaging portion into which the tip of the skin attachment portion of the skin fixing member engages.

[0033] With this configuration, the tip of the skin attachment portion of the skin fixing member engages with the engaging portion of the base, thereby preventing the skin attachment portion from coming off.

[0034] The present invention relates to a surface fixing member for fixing a surface covering that covers the front surface of a base in a sheet to a locking portion that protrudes from the rear edge of the base toward the rear side, wherein the surface fixing member comprises a surface attachment portion having a shape to which the end of the surface covering can be attached, and a locking portion that locks with the locking portion of the base, the locking portion has an outer locking piece and an inner locking piece that are spaced apart from each other and capable of sandwiching the locking portion from the inside and outside of the base, the inner locking piece has an inner projection that protrudes toward the inside of the gap between the outer locking piece and the inner locking piece, the outer locking piece has a reaction force receiving portion at its tip capable of receiving a reaction force from the locking portion, and the surface fixing member is configured such that the locking portion is locked by the outer locking piece and the inner locking piece The device is configured such that, by being locked to the locking portion with the inner projection sandwiched between them, tension is generated in the skin at the end of the skin in the direction toward the front surface of the base, and this tension causes the inner projection to be pressed against the inner surface of the locking portion, becoming a fulcrum, and the reaction force receiving portion is pressed against the outer surface of the locking portion, receiving a reaction force from that outer surface and becoming the point of application of force, and the reaction force receiving portion is configured to receive the reaction force such that the rotational moment due to the tension in the skin received by the skin mounting portion with the inner projection as the center of rotation balances the rotational moment due to the force acting on the skin mounting portion.

[0035] With this configuration, the skin fixing member that fixes the edge of the skin to the sheet base has a structure that makes it difficult for the locking portion to come loose even when the skin attachment portion receives tension from the skin in the direction toward the front of the base. Specifically, the locking portion has an outer locking piece and an inner locking piece that are spaced apart from each other to form a gap that can sandwich the locking portion. The inner locking piece has an inner projection that protrudes inward into the gap. The outer locking piece has a reaction force receiving portion at its tip that can receive a reaction force from the outer surface of the locking portion.

[0036] In this skin fixing member, the locking portion is locked to the locked portion by sandwiching it between the outer locking piece and the inner locking piece, thereby generating tension in the skin at the end of the skin in a direction toward the front surface of the base. This tension causes the inner protrusion to be pressed against the inner surface of the locked portion, becoming a fulcrum, and the reaction force receiving portion is pressed against the outer surface of the locked portion, receiving a reaction force from that outer surface and becoming the point of application of force. The reaction force receiving portion applies a force to the skin attachment portion in a direction perpendicular to the direction of tension and toward the locked portion, thereby receiving a reaction force such that the rotational moment due to the tension in the skin received by the skin attachment portion with the inner protrusion as the center of rotation balances the rotational moment due to the aforementioned force acting on the skin attachment portion.

[0037] Therefore, in this skin fixing member, the balance of two rotational moments acting on the skin attachment portion prevents the skin fixing portion from rotating. As a result, the locking portion of the skin fixing member can maintain a state of being locked to the locked portion of the base by sandwiching it from the inside and outside with the outer locking piece and the inner locking piece, and the locking portion will not come off the locked portion. Thus, it is possible to stably fix the edge of the skin using only the skin fixing member without adding any additional parts to the sheet. [Effects of the Invention]

[0038] As described above, the sheet and surface fixing member of the present invention make it possible to stably fix the edges of the surface using only the fixing member without adding any additional parts to the sheet. [Brief explanation of the drawing]

[0039] [Figure 1] This is a perspective view showing the overall configuration of a third-row rear seat as an example of a seat according to the embodiment of the present invention, and it shows the state before the armrest is stored in the armrest storage compartment. [Figure 2] Figure 1 is a perspective view showing the state after the armrests of the third-row rear seats have been retracted into the armrest storage compartments. [Figure 3] Figure 1 is an enlarged perspective view showing the joint between the outer covering and the lower component of the base at the upper end of the armrest storage compartment. [Figure 4] Figure 1 is a cross-sectional diagram illustrating the arrangement of the upper component of the base, the outer covering, and the outer covering fixing member at the upper end of the armrest storage section. [Figure 5] Figure 4 is an enlarged cross-sectional view of the upper component of the base, the skin, and the skin fixing member, and Figure 6 is a VV cross-section of the skin fixing member. [Figure 6] Figure 5 is a perspective view of the skin fixing member. [Figure 7] Figure 6 shows a cross-sectional view of the VII-VII section of the skin fixing member, and is a cross-sectional explanatory diagram showing the positional relationship between the skin fixing member, the upper component of the base, and the skin at the slit formation position of the skin fixing member. [Figure 8] Figure 5 is a cross-sectional diagram illustrating the state in which the inner projection of the skin fixing member, which acts as a fulcrum when the skin attachment portion is subjected to skin tension, is pressed against the inner surface of the locking portion. [Figure 9] Figure 8 is a cross-sectional diagram illustrating the state in which the convex portion at the tip of the outer locking piece, which is the reaction force receiving portion, receives a reaction force from the outer surface of the locked portion and becomes the point of application of force. [Figure 10] Figure 9 is a cross-sectional explanatory diagram showing the state in which the skin attachment portion is subjected to a force acting in a direction perpendicular to the skin tension and approaching the locked portion, becoming the point of application of that force. [Figure 11] Figures 8-10 are cross-sectional diagrams illustrating how the inner protrusions, convex parts, and skin attachment parts function as fulcrums, effort points, and load points. [Figure 12]Figure 4 is a cross-sectional diagram illustrating the action of inserting fingers between the skin and the armrest at the upper end of the armrest storage compartment to remove the armrest. [Figure 13] This is a cross-sectional diagram illustrating a modified sheet of the present invention, in which the outer locking piece has an inclined tip portion as a reaction force receiving portion. [Figure 14] This is a cross-sectional view showing a conventional sheet structure in which the surface is fastened at points with clips. [Figure 15] This is a cross-sectional view showing a conventional seat structure in which the seat cover is fixed to the lower edge of the frame with a Y-shaped fixing member. [Modes for carrying out the invention]

[0040] Hereinafter, a sheet and a skin fixing member according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0041] (Overall structure of the sheet) As an example of an embodiment of the seat of the present invention, the seat 1 shown in Figures 1 and 2 is a third-row rear seat of a vehicle. This seat 1 has two main seats 2 on each side and a center seat 3 in the middle. In the drawings used in this embodiment, the front-to-back direction of the seat 1 is indicated by arrow X (front side X1, rear side (rear surface side) X2), the width direction by arrow Y, and the up-and-down direction by arrow Z (upper side Z1, lower side Z2).

[0042] As shown in Figures 1-4, the center seat 3 comprises a base 4 with an armrest storage compartment 7, a headrest 5, an armrest 6, a skin 8 that covers the upper part of the base 4 (specifically, the upper component portion 4b), and a skin fixing member 9 (hereinafter referred to as fixing member 9) for fixing the skin 8 to the base 4.

[0043] As shown in Figures 3-4, the armrest storage compartment 7 is positioned adjacent to the outer side (lower Z2 in Figures 3-4) of the end 8a of the skin 8 extending to the rear side X2 of the base 4 (hereinafter referred to as the skin end 8a). The armrest 6 shown in Figures 1-2 is stored upright in the armrest storage compartment 7 and can support the back of the occupant. On the other hand, when the armrest 6 is removed from the armrest storage compartment 7 and tilted forward X1, it can be used as an armrest for the occupants of the main seats 2 on both sides.

[0044] As shown in Figures 4-5, the base 4 has a lower component 4a and an upper component 4b located above the lower component 4a at Z1. By integrally molding these lower component 4a and upper component 4b with resin, a vertical rectangular base 4 is formed, which becomes the main body of a seat back capable of supporting the back of a seated person. As shown in Figure 4, the base 4 is supported by a frame 10, and the rear side X2 of the base 4 is covered by a backboard 11 and a skin 8.

[0045] The lower component 4a is a vertical, roughly plate-shaped portion and constitutes the bottom wall (rear wall X2) of the armrest storage section 7. Furthermore, as shown in Figure 5, the lower component 4a in this embodiment has a receiving portion 4a1 that receives the tip of the surface attachment portion 12 of the fixing member 9 described later, and an engaging portion 4a2 into which the tip engages.

[0046] As shown in Figure 4, the upper component 4b protrudes forward X1 from above the lower component 4a at Z1, forming a step in the front-rear direction X between it and the lower component 4a. Utilizing this step, the armrest storage section 7, capable of housing a rectangular block-shaped armrest 6, is formed below Z2 of the upper component 4b and in front X1 of the lower component 4a.

[0047] The front surface 4b2 of the upper component 4b has protrusions (pleats) 4d extending in the vertical direction Z. Multiple protrusions 4d are arranged side by side in the width direction Y of the sheet 1.

[0048] As shown in Figures 4-5, a locking portion 4b1 is provided on the rear surface 4b3 of the upper component 4b. The locking portion 4b1 protrudes from the lower edge 4b31 of the rear surface 4b3 of the upper component 4b toward the rear surface X2. The locking portion 4b1 has an outer surface 4b11 facing the outside (lower Z2 in Figure 5) of the upper component 4b and an inner surface 4b12 facing the inside (upper Z1 in Figure 5). Furthermore, an inclined surface 4b13 is formed at the tip of the inner surface 4b12 (the end of the rear surface X2), which slopes in a direction that causes the locking portion 4b1 to become narrower as it approaches the tip side (rear surface X2). A gap 4c is formed between the locking portion 4b1 and the lower component 4a. A fixing member 9 is fitted into the gap 4c.

[0049] As shown in Figure 4, the outer layer 8 covers the front surface 4b2 of the upper component portion 4b of the base 4 and also covers the rear surface X2 of the backboard 11.

[0050] As shown in Figure 5, the epidermal end portion 8a extends from the lower end (end of the lower Z2) of the front surface 4b2 of the upper component portion 4b toward the rear surface X2, passing over the locking portion 4b1 to the rear surface X2 of the base body.

[0051] (Configuration of the fixing member 9) The fixing member 9 is configured to fix the skin end portion 8a to the locking portion 4b1 of the upper component portion 4b of the base 4 shown in Figures 4-5 at the edge 4b31 of the rear surface 4b3 of the upper component portion 4b of the base 4. Specifically, as shown in Figures 5-6, the fixing member 9 comprises a skin attachment portion 12 to which the skin end portion 8a is attached, a locking portion 13 that locks onto the locking portion 4b1, and a connecting arm portion 14 that connects the skin attachment portion 12 and the locking portion 13. The locking portion 13 is positioned closer to the locking portion 4b1 than the skin attachment portion 12 (front side X1 in Figure 5).

[0052] As shown in Figure 6, the fixing member 9 of this embodiment is composed of a long, strip-shaped member extending in a second direction D2 perpendicular to a first direction D1 in which the surface attachment portion 12 and the locking portion 13 are aligned. The first direction D1 corresponds to the front-rear direction X of the seat 1 in the mounting state of the fixing member 9 in Figure 5. The second direction D2 corresponds to the width direction Y of the seat 1 in Figure 3 in the mounting state of the fixing member 9 in Figure 5.

[0053] In the strip-shaped member constituting the fixing member 9, a slit 22 (see Figures 6-7) is formed near the center in the second direction D2 by removing the locking portion 13 and the connecting arm portion 14. In the area where the slit 22 is formed, the locking portion 13 and the connecting arm portion 14 are absent, making it easier for the skin end portion 8a to bend upward Z1 when the user places their fingers FR (see Figure 12) into the armrest storage portion 7.

[0054] The skin attachment portion 12 has a shape to which the skin end portion 8a can be attached. Specifically, as shown in Figure 5, it is a portion that extends linearly in the front-rear direction X and has a flat portion 15 that linearly guides the skin end portion 8a toward the rear side X2. The skin end portion 8a is fixed by sewing, like the sewing portion 16, when wrapped around the skin attachment portion 12. The thickness of the skin attachment portion 12 is sufficient to allow the skin end portion 8a to be sewn to the skin attachment portion 12. Note that the skin end portion 8a may also be fixed to the skin attachment portion 12 by methods other than sewing, such as adhesive or fastening with metal fittings.

[0055] The skin end portion 8a is attached to the locked portion 4b1 via the skin attachment portion 12 while being pulled toward the rear side X2, moving away from the outer surface 4b11 of the locked portion 4b11 toward the outside of the upper component portion 4b of the base 4 (lower side Z2 in Figures 4-5). The tip of the skin attachment portion 12 (the end of the rear side X2) is supported by the receiving portion 4a1 of the lower component portion 4a of the base 4, and the engaging portion 4a2 engages with the tip to prevent it from coming out of the receiving portion 4a1.

[0056] The connecting arm portion 14 has a stepped portion 21 that bends away from the skin end portion 8a. This makes it easier for the skin end portion 8a to bend upward Z1 when the user places their fingers FR (see Figure 12) into the armrest storage portion 7.

[0057] As shown in Figure 5, the locking portion 13 has an outer locking piece 17 and an inner locking piece 18 that are spaced apart from each other, namely the outer locking piece 17 that abuts against the outer surface 4b11 of the locked portion 4b1 and the inner locking piece 18 that abuts against the inner surface 4b12 of the locked portion 4b1. The locking portion 13 is locked to the locked portion 4b1 by sandwiching the locked portion 4b1 between the outer locking piece 17 and the inner locking piece 18.

[0058] The inner locking piece 18 has an inner projection 20 that protrudes toward the inner surface 4b12 of the locked portion 4b1. In this embodiment, the inner projection 20 protrudes toward the inside of the gap between the outer locking piece 17 and the inner locking piece 18 and is positioned at the base of the inner locking piece 18. The inner projection 20 makes pinpoint contact with the inclined surface 4b13 on the tip side (rear side X2) of the inner surface 4b12 of the locked portion 4b1 at the position of contact point CP.

[0059] Furthermore, the inner locking piece 18 has an inclined surface 18a that slopes away from the inner surface 4b12 of the locked portion 4b1 as it approaches the tip of the inner locking piece 18.

[0060] The outer locking piece 17 has a protrusion 19 at its tip 17a that acts as a reaction force receiving portion to receive a reaction force F2 from the outer surface 4b11 of the locked portion 4b1.

[0061] In this embodiment, the reaction force receiving portion is composed of a protrusion 19 that projects from the tip 17a of the outer locking piece 17 toward the outer surface 4b11 of the locked portion 4b11. This protrusion 19 projects inward into the gap between the outer locking piece 17 and the inner locking piece 18. The protrusion 19 is strongly pressed against and bites into the outer surface 4b11 of the locked portion 4b11 by the rotational moment M1 (see Figure 11) of the fixing member 9 around the contact point CP of the inner protrusion 20, which is generated by the tension that the skin end portion 8a exerts toward the front side X1.

[0062] Furthermore, in this embodiment, the tip portion 17a of the outer locking piece 17 is inclined toward the outer surface 4b11 of the locked portion 4b1 with respect to the direction in which the skin attachment portion 12 extends (up and down direction X in Figure 5). This inclined tip portion 17a itself can also function as a reaction force receiving portion.

[0063] In the fixing member 9 of this embodiment, the locking portion 13 is locked to the locked portion 4b1 by sandwiching it between the outer locking piece 17 and the inner locking piece 18. In this state, the inner projection 20 of the inner locking piece 18 makes pinpoint contact with the inclined surface 4b13 on the tip side of the inner surface 4b12 of the locked portion 4b1 at the position of contact point CP. Furthermore, the convex portion 19 provided on the tip portion 17a of the outer locking piece 17 is strongly pressed against and bites into the outer surface 4b11 of the locked portion 4b1.

[0064] Furthermore, as shown in Figure 5, when viewed in a direction perpendicular to the direction in which the skin attachment portion 12 and the locking portion 13 are aligned (front-to-back direction X in Figure 5) (up-to-down direction Z in Figure 5), the flat portion 15 of the skin attachment portion 12 is located further from the inner projection 20 of the inner locking piece 18 than the convex portion 19 and tip portion 17a of the outer locking piece 17 which functions as a reaction force receiving portion.

[0065] The locking portion 13 is locked to the locked portion 4b1 by sandwiching the locked portion 4b1 between the outer locking piece 17 and the inner locking piece 18. Due to the tension T (see Figure 8) of the skin end portion 8a, the protrusion 19 (reaction force receiving portion) on the tip side of the outer locking piece 17 receives a reaction force F2 from the outer surface 4b11 of the locked portion 4b11, with the contact point CP of the inner projection 20 of the inner locking piece 18 acting as a fulcrum, and thus becomes the point of application of force.

[0066] As shown in Figure 11, the convex portion 19, which is the reaction force receiving portion, is configured to receive a reaction force such that the rotational moment M1 due to the tension T of the skin end 8a received by the skin attachment portion 12 from the outer surface 4b11 of the locked portion 4b1 is perpendicular to the direction of the tension T of the skin end 8a (vertical direction Z in Figure 10) and approaches the locked portion 4b1 (upward direction Z1). The convex portion 19 is configured to receive a reaction force such that the rotational moment M1 due to the tension T of the skin 8 received by the skin attachment portion 12, with the contact point CP of the inner protrusion 20 as the center of rotation, and the rotational moment M2 due to the force F3 acting on the skin attachment portion 12 are balanced. The specific effects will be explained in detail below.

[0067] (Features of this embodiment) (1) In this embodiment, the seat 1, as shown in Figures 1-2 for the center seat 3, has a fixing member 9 that, as shown in Figures 4-5, has a locking portion 4b1 protruding from the edge 4b31 of the rear surface 4b3 of the upper component portion 4b of the base 4 to the rear side X2, and the surface edge 8a is fixed to the locking portion 4b1 of the upper component portion 4b by being locked to the locking portion 4b1. This fixing member 9 has a configuration that makes it difficult for the locking portion 13, which is locked to the locking portion 4b1, to come off even when the surface attachment portion 12 receives tension T of the surface 8 in the direction toward the front surface 4b2 of the upper component portion 4b. Specifically, the locking portion 13 has an outer locking piece 17 that abuts against the outer surface 4b11 of the locked portion 4b1 and an inner locking piece 18 that abuts against the inner surface 4b12 of the locked portion 4b1, and is locked to the locked portion 4b1 by sandwiching it between the outer locking piece 17 and the inner locking piece 18. The inner locking piece 18 has an inner projection 20 that protrudes toward the inner surface 4b12 of the locked portion 4b1. The outer locking piece 17 has a convex portion 19 at its tip 17a that acts as a reaction force receiving portion to receive a reaction force F2 from the outer surface 4b11 of the locked portion 4b1.

[0068] As shown in Figure 8, in this embodiment, the fixing member 9 is secured to the locked portion 4b1 by the outer locking piece 17 and the inner locking piece 18 while the skin end portion 8a attached to the skin attachment portion 12 is being pulled, thereby generating a tension T on the skin end portion 8a in the direction toward the front surface 4b2 of the upper component portion 4b of the base body 4 (forward side X1). Due to this tension T, the inner projection 20 of the inner locking piece 18 is pressed against the inner surface 4b12 of the locked portion 4b1 (specifically, the inclined surface 4b13 on the tip side of the inner surface 4b12) at the position of the contact point CP (see pressing force F1), thereby becoming a fulcrum.

[0069] At this time, as shown in Figure 9, the projection 19 (reaction force receiving portion) at the tip of the outer locking piece 17 is pressed against the outer surface 4b11 of the locked portion 4b11 and receives a reaction force F2 from the outer surface 4b11, becoming the point of application of force. The projection 19 applies a force F3 to the skin attachment portion 12 in a direction perpendicular to the direction of tension T (up and down direction Z in Figure 10) and in a direction approaching the locked portion 4b1 (upward direction Z1) due to the reaction force F2.

[0070] As a result, as shown in Figure 11, the rotational moment M1 due to the tension T of the skin 8 acting on the skin attachment portion 12, with the contact point CP of the inner protrusion 20 as the center of rotation, and the rotational moment M2 due to the force F3 acting on the skin attachment portion 12 can be balanced.

[0071] Therefore, in this fixing member 9, the balance of two rotational moments M1 and M2 acting on the surface attachment portion 12 prevents the fixing member 9 from rotating. As a result, the locking portion 13 of the fixing member 9 can maintain a state of being locked to the locked portion 4b1 of the base body by sandwiching it from the inside and outside with the outer locking piece 17 and the inner locking piece 18, and the locking portion 13 cannot come off the locked portion 4b1. Therefore, since no additional member such as a retaining member is required for the locked portion 4b1 in addition to the fixing member 9, it is possible to stably fix the surface edge 8a with only the fixing member 9 without adding any additional parts to the sheet 1.

[0072] (2) In the sheet 1 of this embodiment, the reaction force receiving portion is composed of a protrusion 19 that extends from the tip 17a of the outer locking piece 17 toward the outer surface 4b11 of the locked portion 4b11. Therefore, by this protrusion 19 biting into the outer surface 4b11 of the locked portion 4b11, it is possible to reliably receive the reaction force F2 from the outer surface 4b11.

[0073] (3) In the sheet 1 of this embodiment, the reaction force receiving portion is formed not only by the convex portion 19 but also by the inclined tip portion 17a. With this configuration, the tip portion 17a of the outer locking piece 17 is inclined toward the outer surface 4b11 of the locked portion 4b11 with respect to the direction in which the skin attachment portion 12 extends, thereby also forming a reaction force receiving portion. As a result, the inclined tip portion 17a and the convex portion 19 bite into the outer surface 4b11 of the locked portion 4b11, making it possible to reliably receive the reaction force F2 from the outer surface 4b11.

[0074] As a modified example of the present invention, even if the outer locking piece 17 does not have a protrusion 19, as shown in Figure 13, if the tip portion 17a of the outer locking piece 17 is inclined toward the outer surface 4b11 of the locked portion 4b11 with respect to the direction in which the skin attachment portion 12 extends, thereby forming a reaction force receiving portion, then the inclined tip portion 17a bites into the outer surface 4b11 of the locked portion 4b11, making it possible to reliably receive the reaction force F2 from the outer surface 4b11.

[0075] Here, in order for the tip portion 17a of the outer locking piece 17 to be inclined toward the outer surface 4b11 of the locked portion 4b11 with respect to the direction in which the skin attachment portion 12 extends, the outer locking piece 17 should be positioned along a line L2 that is inclined toward the inner locking piece 18 with respect to the extension line L1 of the flat portion 15 of the skin attachment portion 12.

[0076] (4) In the sheet 1 of this embodiment, the surface attachment portion 12 has a flat portion 15 that linearly guides the surface edge 8a toward the rear side X2. With this configuration, since the surface edge 8a follows the flat portion 15 of the surface attachment portion 12, it is possible to maintain a uniform appearance on the sheet 1.

[0077] (5) In the sheet 1 of this embodiment, the outer surface edge 8a is fixed in a state where it is wrapped around the outer surface attachment portion 12. With this configuration, since the outer surface edge 8a is fixed in a state where it is wrapped around the outer surface attachment portion 12, it is possible to firmly fix the outer surface edge 8a to the outer surface attachment portion 12. At the same time, the line of the joint P between the outer surface edge 8a and other members, and in this embodiment the lower component portion 4a of the base 4 shown in Figures 3-4, is clearly and neatly defined.

[0078] (6) In the sheet 1 of this embodiment, the thickness of the surface attachment portion 12 is such that the surface edge 8a can be sewn to the surface attachment portion 12. With this configuration, it becomes easier to sew the surface edge 8a to the surface attachment portion 12. At the same time, the seam P (see Figures 3-4) between the surface edge 8a and other members (lower component portion 4a) is more clearly defined and neater.

[0079] (7) In the seat 1 of this embodiment, as shown in Figures 3-4, the base 4 has an armrest storage section 7 for storing the armrest 6 at a position adjacent to the outside (lower Z2) of the surface edge 8a. The fixing member 9 is composed of a long, strip-shaped member extending in a second direction D2 that is perpendicular to the first direction D1 (see Figure 6) where the surface attachment section 12 and the locking section 13 are aligned. Near the center of the strip-shaped member constituting the fixing member 9 in the second direction D2 (width direction Y of the seat 1 in this embodiment), a slit 22 (see Figures 6-7) is formed by removing the locking section 13. Therefore, when a user of seat 1 inserts their fingers FR (see Figure 12) into the gap between the armrest 6 and the skin end 8a in order to remove the armrest 6 from the armrest storage compartment 7 of the base body, the skin end 8a flexes inward (upper Z1) of the base body 4 at the slit 22 of the fixing member 9, making it easier to insert the fingers FR into the gap, thus improving the ease of finger insertion. This makes it easier to remove the armrest 6 from the armrest storage compartment 7.

[0080] (8) In the seat 1 of this embodiment, the fixing member 9 includes a connecting arm portion 14 that connects the surface attachment portion 12 and the locking portion 13. The connecting arm portion 14 has a stepped portion 21 that bends away from the surface end portion 8a. Therefore, as shown in Figure 12, when a user of the seat 1 inserts their fingers FR into the gap between the armrest 6 and the surface end portion 8a in order to remove the armrest 6 from the armrest storage portion 7 of the base body 4, the surface end portion 8a flexes inward (upper Z1) of the base body 4 at the portion of the stepped portion 21 of the fixing member 9, making it easier to insert the fingers FR into the gap, thus improving the ease of finger insertion. This makes it easier to remove the armrest 6 from the armrest storage portion 7.

[0081] (9) In the sheet 1 of this embodiment, as shown in Figure 5, the inner locking piece 18 has an inclined surface 18a that slopes away from the inner surface 4b12 of the locked portion 4b1 as it approaches the tip of the inner locking piece 18.

[0082] With this configuration, when the locking portion 13 of the fixing member 9 is locked to the locked portion 4b1, the locked portion 4b1 is guided by the inclined surface 18a of the inner locking piece 18, making it easier for the locking portion 13 to lock the locked portion 4b1 between the inner locking piece 18 and the outer locking piece 17. Therefore, the work efficiency of locking the fixing member 9 to the locked portion 4b1 is improved.

[0083] (10) In the sheet 1 of this embodiment, as shown in Figure 5, the inner projection 20 is positioned at the base of the inner locking piece 18. With this configuration, when the tension T of the skin 8 toward the front surface 4b2 of the upper component 4b is received by the skin attachment portion 12, the inner projection 20 positioned at the base of the inner locking piece 18 is pressed against the inner surface 4b12 near the tip of the locked portion 4b1. As a result, the inner projection 20 makes pinpoint contact with the inner surface 4b12 of the locked portion 4b1 (see contact point CP) and bites into the inner surface 4b12, making it difficult for the inner projection 20 to shift, and thus enabling it to stably function as a fulcrum. Consequently, the skin end 8a can be fixed more stably.

[0084] (11) In the sheet 1 of this embodiment, as shown in Figure 5, the lower component portion 4a of the base 4 has an engaging portion 4a2 into which the tip of the skin attachment portion 12 of the fixing member 9 engages. With this configuration, the tip of the skin attachment portion 12 of the fixing member 9 engages with the engaging portion 4a2 of the lower component portion 4a of the base 4, thereby preventing the skin attachment portion 12 from coming off.

[0085] (12) As described above, the fixing member 9 of this embodiment has a configuration that makes it difficult for the locking portion 13, which is locked to the locked portion 4b1, to come loose even when the tension T of the skin 8 toward the front surface 4b2 of the upper component portion 4b is received by the skin attachment portion 12. Specifically, the locking portion 13 has an outer locking piece 17 that abuts against the outer surface 4b11 of the locked portion 4b1 and an inner locking piece 18 that abuts against the inner surface 4b12 of the locked portion 4b1, and is locked to the locked portion 4b1 while being sandwiched between the outer locking piece 17 and the inner locking piece 18. The inner locking piece 18 has an inner projection 20 that protrudes toward the inner surface 4b12 of the locked portion 4b1. The outer locking piece 17 has a convex portion 19 at its tip 17a that receives a reaction force F2 from the outer surface 4b11 of the locked portion 4b1 as a reaction force receiving portion.

[0086] In the fixing member 9 of this embodiment, as shown in Figure 8, when the skin end portion 8a attached to the skin attachment portion 12 is pulled, the locking portion 13 is locked to the locked portion 4b1 by sandwiching the locked portion 4b1 between the outer locking piece 17 and the inner locking piece 18, thereby generating a tension T on the skin end portion 8a in the direction toward the front surface 4b2 of the upper component portion 4b of the base body 4 (forward side X1). Due to this tension T, the inner projection 20 of the inner locking piece 18 is pressed against the inner surface 4b12 of the locked portion 4b1 (specifically, the inclined surface 4b13 on the tip side of the inner surface 4b12) at the position of the contact point CP (see pressing force F1), and acts as a fulcrum.

[0087] At this time, as shown in Figure 9, the projection 19 (reaction force receiving portion) at the tip of the outer locking piece 17 is pressed against the outer surface 4b11 of the locked portion 4b11 and receives a reaction force F2 from the outer surface 4b11, becoming the point of application of force. The projection 19 applies a force F3 to the skin attachment portion 12 in a direction perpendicular to the direction of tension T (up and down direction Z in Figure 10) and in a direction approaching the locked portion 4b1 (upward direction Z1) due to the reaction force F2.

[0088] As a result, as shown in Figure 11, the rotational moment M1 due to the tension T of the skin 8 acting on the skin attachment portion 12, with the contact point CP of the inner protrusion 20 as the center of rotation, and the rotational moment M2 due to the force F3 acting on the skin attachment portion 12 can be balanced.

[0089] Therefore, in this fixing member 9, the balance of two rotational moments M1 and M2 acting on the surface attachment portion 12 prevents the fixing member 9 from rotating. As a result, the locking portion 13 of the fixing member 9 can maintain a state of being locked to the locked portion 4b1 of the base body by sandwiching it from the inside and outside with the outer locking piece 17 and the inner locking piece 18, and the locking portion 13 cannot come off the locked portion 4b1. Therefore, since no additional member such as a retaining member is required for the locked portion 4b1 in addition to the fixing member 9, it is possible to stably fix the surface edge 8a with only the fixing member 9 without adding any additional parts to the sheet 1. [Explanation of Symbols]

[0090] 1 sheet 4 Base 4a Lower component 4a2 Engagement part 4b Upper component 4b1 Locked part 4b11 External surface 4b12 Inner Self 4b2 front 4b3 rear 6 Armrest 7 Armrest storage compartment 8 Epidermis 9. Skin fixing member 12. Surface attachment part 13 Locking part 14 Connecting arm 15 Plane part 16 Sewing section 17 Outer locking piece 17a Tip 18 Inner locking piece 19 Convex part 20 Inner protrusion 21 Stepped section 22 slits

Claims

1. A sheet comprising a base, a skin covering the front surface of the base, and a skin fixing member that fixes the end of the skin to the base at the edge of the rear surface of the base, The base has a locking portion that protrudes from the edge of the rear surface of the base toward the rear surface, and the locking portion has an outer surface facing the outside of the base and an inner surface facing the inside. The end of the skin extends beyond the locking portion toward the rear surface of the base, The aforementioned skin fixing member is The skin attachment portion to which the end of the skin is attached, A locking portion is positioned closer to the locking portion than the surface attachment portion and is locked to the locking portion. Equipped with, The end of the skin is locked to the locking portion via the skin attachment portion. The locking portion has an outer locking piece that abuts against the outer surface of the locked portion and an inner locking piece that abuts against the inner surface of the locked portion. The inner locking piece has an inner projection that protrudes toward the inner surface of the locked portion, The outer locking piece has a reaction force receiving portion at its tip that receives the reaction force from the outer surface of the locked portion, The locking portion is locked to the locked portion by sandwiching it between the outer locking piece and the inner locking piece, and is configured such that the reaction force receiving portion receives a reaction force from the outer surface of the locked portion, with the inner protrusion acting as a fulcrum due to the tension of the surface. The reaction force receiving portion is configured to receive a reaction force such that the rotational moment due to the tension of the skin acting on the skin attachment portion, with the inner protrusion as the center of rotation, balances the rotational moment due to the force acting on the skin attachment portion, by applying a force to the skin attachment portion in a direction perpendicular to the direction of the tension and in a direction approaching the locked portion. A sheet characterized by the following features.

2. In the sheet described in claim 1, The reaction force receiving portion is composed of a protrusion that extends from the tip of the outer locking piece toward the outer surface of the locked portion. A sheet characterized by the following features.

3. In the sheet according to claim 1 or 2, The reaction force receiving portion is configured such that the tip of the outer locking piece is inclined toward the outer surface of the locked portion with respect to the direction in which the skin attachment portion extends. A sheet characterized by the following features.

4. In the sheet according to claim 1 or 2, The skin attachment portion has a flat portion that linearly guides the end of the skin toward the rear side. A sheet characterized by the following features.

5. In the sheet according to claim 1 or 2, The end of the skin is fixed in place by being wrapped around the skin attachment portion. A sheet characterized by the following features.

6. In the sheet described in claim 5, The thickness of the skin attachment portion is such that the edge of the skin can be sewn to the skin attachment portion. A sheet characterized by the following features.

7. In the sheet according to claim 1 or 2, The base has an armrest storage section for storing the armrest at a position adjacent to the outer edge of the skin, The skin fixing member is composed of a long, strip-shaped member extending in a second direction perpendicular to the first direction in which the skin attachment portion and the locking portion are aligned. A slit is formed near the center of the strip-shaped member in the second direction, which is formed by removing the locking portion. A sheet characterized by the following features.

8. In the sheet according to claim 1 or 2, The base has an armrest storage section for storing the armrest at a position adjacent to the outer edge of the skin, The skin fixing member further comprises a connecting arm that connects the skin attachment portion and the locking portion, The connecting arm portion has a stepped portion that bends away from the end of the skin. A sheet characterized by the following features.

9. In the sheet according to claim 1 or 2, The inner locking piece has an inclined surface that slopes away from the inner surface of the locked portion as it approaches the tip of the inner locking piece. A sheet characterized by the following features.

10. In the sheet according to claim 1 or 2, The inner protrusion is located at the base of the inner locking piece. A sheet characterized by the following features.

11. In the sheet according to claim 1 or 2, The base further has an engaging portion into which the tip of the skin attachment portion of the skin fixing member engages. A sheet characterized by the following features.

12. A skin fixing member for fixing a skin covering the front surface of a base in a sheet to a locking portion that protrudes from the edge of the rear surface of the base toward the rear side, The aforementioned skin fixing member is The end of the skin has a shape to which the skin can be attached, A locking portion that is locked to the locking portion of the base and Equipped with, The locking portion has an outer locking piece and an inner locking piece that are spaced apart from each other and capable of sandwiching the locked portion from the inside and outside of the base body, The inner locking piece has an inner projection that protrudes inward into the gap between the outer locking piece and the inner locking piece. The outer locking piece has a reaction force receiving portion at its tip that can receive a reaction force from the locked portion, The skin fixing member is configured such that the locking portion is locked to the locked portion by the outer locking piece and the inner locking piece, thereby generating tension in the skin at the end of the skin in the direction toward the front surface of the base, and this tension causes the inner protrusion to be pressed against the inner surface of the locked portion, becoming a fulcrum, and the reaction force receiving portion to be pressed against the outer surface of the locked portion, receiving a reaction force from that outer surface and becoming the point of application of force. The reaction force receiving portion is configured to receive a reaction force such that the rotational moment due to the tension of the skin acting on the skin attachment portion, with the inner protrusion as the center of rotation, balances the rotational moment due to the force acting on the skin attachment portion, by applying a force to the skin attachment portion in a direction perpendicular to the direction of the tension and in a direction approaching the locked portion. A skin fixing member characterized by the above.

Images