Two-wheel vehicle seat

Abstract

To increase restoring force and repulsive force in a two-wheel vehicle seat with a biomass urethane pad.SOLUTION: A two-wheel vehicle seat 1 has: a bottom plate 25 supported by a vehicle body 3; and a pad 26 including biomass urethane and supported by the bottom plate. The bottom plate includes: a first bottom plate 28 supported by the vehicle body; and a second bottom plate 29 supported via a support member 32 by the first bottom plate. At least a part of the pad is supported by the second bottom plate.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a seat for a two-wheeled vehicle, and particularly to a seat for a motorcycle.

Background Art

[0002] Patent Document 1 discloses a saddle for a bicycle including a support shell, a pad positioned on the support shell, and a coating covering the pad. The pad includes a first portion that directly contacts the outer coating and a second portion that is disposed to directly contact the support shell. The first portion is made of a polyurethane gel, and the second portion is made of a polyurethane foam. The first portion is obtained from a product of natural origin (i.e., a product not of fossil origin).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Natural materials, i.e., biomass materials, are attracting attention as environmentally friendly materials because they contribute to suppressing carbon dioxide emissions. In recent years, urethane foams using biomass materials, i.e., biomass polyurethanes, have also been realized.

[0005] The inventors of the present application have advanced research and development on applying a pad using biomass polyurethane as a cushioning material (hereinafter referred to as a biomass urethane pad) to a two-wheeler seat. In this research and development, the inventors of the present application have found that the biomass urethane pad has a problem of lacking resilience and repulsive force compared to a pad using polyurethane of a synthetic resin derived from fossil resources such as petroleum (hereinafter referred to as a synthetic resin urethane pad). When the synthetic resin urethane pad is replaced with a biomass urethane pad, there is a risk that sufficient resilience and repulsive force cannot be imparted to the seated person.

[0006] In view of the above background, an object of the present invention is to increase the resilience and repulsive force in a two-wheeler seat provided with a biomass urethane pad.

Means for Solving the Problems

[0007] In order to solve the above problems, an aspect of the present invention is a two-wheeler seat (1), comprising a bottom plate (25) supported by a vehicle body (3), and a pad (26) containing biomass polyurethane and supported by the bottom plate, wherein the bottom plate includes a first bottom plate (28) supported by the vehicle body and a second bottom plate (29) supported by the first bottom plate via support members (32, 60, 70), and at least a part of the pad is supported by the second bottom plate.

[0008] According to this aspect, a part of the pad containing biomass polyurethane is supported via the second bottom plate. Therefore, by changing the support mode of the second bottom plate with respect to the first bottom plate and the rigidity of the second bottom plate, etc., the resilience and repulsive force applied to the seated person in the part containing biomass polyurethane can be increased.

[0009] In the above aspect, preferably, the first bottom plate is provided with a through hole (30) for receiving the second bottom plate, and an inner edge portion (35) defining the through hole of the first bottom plate and an outer edge portion (37) of the second bottom plate are connected by the flexible support member.

[0010] According to this aspect, the second bottom plate is supported by the first bottom plate via the support member, and the portion of the pad containing biomass urethane is arranged to overlap the second bottom plate. Therefore, by changing the support member, the restoring force and repulsive force applied to the portion of the pad containing biomass urethane can be adjusted, and the restoring force and repulsive force applied to the seated person in the portion containing biomass urethane can be increased.

[0011] In the above aspect, preferably, at least one of the first bottom plate and the second bottom plate is provided with hole portions (34, 36) for passing the support member therethrough.

[0012] According to this aspect, the support member can be well coupled to the plate provided with the wire.

[0013] In the above aspect, preferably, at least one of the inner edge portion of the first bottom plate and the outer edge portion of the second bottom plate is provided with wires (51, 55) extending in the circumferential direction and to which the support member is hooked.

[0014] According to this aspect, the support member can be well coupled to the plate provided with the wire.

[0015] In the above aspect, preferably, the second bottom plate includes a frame body defining an outer edge and a cloth member (62) stretched inside the frame body.

[0016] According to this aspect, by adjusting the material and tension of the cloth member, the restoring force and repulsive force exerted by the seat on the seated person in the portion containing biomass urethane can be increased.

[0017] In the above aspect, preferably, the first bottom plate is provided with a through hole (30) for receiving the second bottom plate, and between an inner edge portion (35) defining the through hole of the first bottom plate and an outer edge portion (37) of the second bottom plate, the second bottom plate is elastically supported by the first bottom plate.

[0018] According to this aspect, the first bottom plate and the second bottom plate can be connected, and the second bottom plate can be floatingly supported with respect to the first bottom plate.

[0019] In the above aspect, preferably, the support member includes a cylindrical portion (72) having an inner hole (73) inserted into the through hole, and an annular flange portion (71) extending from the upper end of the cylindrical portion onto the upper surface of the first bottom plate, and the second bottom plate includes a plate portion (74) and a protruding portion (75) protruding from the plate portion into the inner hole of the cylindrical portion.

[0020] According to this aspect, the movement of the second bottom plate with respect to the first bottom plate can be suppressed.

[0021] In the above aspect, preferably, the pad has a biomass pad portion formed of the biomass urethane and a synthetic resin pad portion formed of synthetic resin urethane, and the synthetic resin pad portion is arranged so as to overlap the second bottom plate in the vertical direction at least in part.

[0022] According to this aspect, the portion of the pad containing synthetic resin urethane is arranged so as to overlap the second bottom plate in the vertical direction. Therefore, in the portion where the second bottom plate is provided, the restoring force and repulsive force exerted on the seated person can be further increased.

[0023] In the above aspect, preferably, at least one of the upper surface and the lower surface of the synthetic resin pad portion is provided with a concavo-convex portion (45) having a concavo-convex shape.

[0024] According to this aspect, the resilience of the synthetic resin pad portion can be increased.

[0025] In the above aspect, preferably, the biomass pad portion and the synthetic resin pad portion are arranged so as to overlap at least partially in the vertical direction.

[0026] According to this aspect, the restoring force and resilience applied to the seated person can be increased as compared with the case where it is constituted only by the biomass pad portion.

[0027] In the above aspect, preferably, the biomass pad portion is arranged so as to overlap the second bottom plate and the first bottom plate from above.

[0028] According to this aspect, since the ratio of the portion constituted by the biomass urethane of the pad can be increased, a more environmentally considerate seat can be provided.

Effects of the Invention

[0029] One aspect of the present invention is a seat (1) for a two-wheeled vehicle, comprising a bottom plate (25) supported by a vehicle body (3), and a pad (26) containing biomass urethane and supported by the bottom plate, wherein the bottom plate includes a first bottom plate (28) supported by the vehicle body and a second bottom plate (29) supported by the first bottom plate via support members (32, 60, 70), and at least a part of the pad is supported by the second bottom plate.

[0030] According to this aspect, a part of the pad including the biomass urethane is supported via the second bottom plate. Therefore, by changing the supporting mode of the second bottom plate with respect to the first bottom plate, the rigidity of the second bottom plate, etc., the resilience and repulsive force applied to the seated person in the part including the biomass urethane can be increased.

[0031] In the above aspect, preferably, the first bottom plate is provided with a through hole (30) for receiving the second bottom plate, and an inner edge portion (35) defining the through hole of the first bottom plate and an outer edge portion (37) of the second bottom plate are connected by the flexible support member.

[0032] According to this aspect, the second bottom plate is supported by the first bottom plate via the support member, and the part of the pad including the biomass urethane is arranged so as to overlap the second bottom plate. Therefore, by changing the support member, the resilience and repulsive force applied to the part of the pad including the biomass urethane can be adjusted, and the resilience and repulsive force applied to the seated person in the part including the biomass urethane can be increased.

[0033] In the above aspect, preferably, at least one of the first bottom plate and the second bottom plate is provided with hole portions (34, 36) for passing the support member.

[0034] According to this aspect, the support member can be favorably coupled to the plate provided with the wire.

[0035] In the above aspect, preferably, at least one of the inner edge portion of the first bottom plate and the outer edge portion of the second bottom plate is provided with wires (51, 55) extending in the circumferential direction and to which the support member is hooked.

[0036] According to this aspect, the support member can be favorably coupled to the plate provided with the wire.

[0037] In the above aspect, preferably, the second bottom plate includes a frame body defining an outer edge and a cloth member (62) stretched inside the frame body.

[0038] According to this aspect, by adjusting the material and stretching condition of the cloth member, the restoring force and repulsive force exerted by the seat on the seated person in the portion containing the biomass urethane can be increased.

[0039] In the above aspect, preferably, the first bottom plate is provided with a through hole (30) for receiving the second bottom plate, and between an inner edge portion (35) defining the through hole of the first bottom plate and an outer edge portion (37) of the second bottom plate, the second bottom plate is resiliently supported by the first bottom plate.

[0040] According to this aspect, the first bottom plate and the second bottom plate can be connected, and the second bottom plate can be floatingly supported with respect to the first bottom plate.

[0041] In the above aspect, preferably, the support member includes a cylindrical portion (72) having an inner hole (73) inserted into the through hole, and an annular flange portion (71) extending from the upper end of the cylindrical portion onto the upper surface of the first bottom plate, and the second bottom plate includes a plate portion (74) and a protruding portion (75) protruding from the plate portion into the inner hole of the cylindrical portion.

[0042] According to this aspect, the movement of the second bottom plate with respect to the first bottom plate can be suppressed.

[0043] In the above aspect, preferably, the pad has a biomass pad portion formed of the biomass urethane and a synthetic resin pad portion formed of the synthetic resin urethane, and the synthetic resin pad portion is arranged so as to overlap the second bottom plate in the vertical direction at least in part.

[0044] According to this aspect, the part of the pad containing synthetic resin urethane is arranged so as to overlap the second bottom plate in the vertical direction. Therefore, in the part where the second bottom plate is provided, the restoring force and repulsive force applied to the seated person can be further increased.

[0045] In the above aspect, preferably, uneven portions (45) having an uneven shape are provided on at least one of the upper surface and the lower surface of the synthetic resin pad portion.

[0046] According to this aspect, the repulsive force of the synthetic resin pad portion can be increased.

[0047] In the above aspect, preferably, the biomass pad portion and the synthetic resin pad portion are arranged so as to overlap at least partially in the vertical direction.

[0048] According to this aspect, the restoring force and repulsive force applied to the seated person can be increased as compared with the case where it is constituted only by the biomass pad portion.

[0049] In the above aspect, preferably, the biomass pad portion is arranged so as to overlap the second bottom plate and the first bottom plate from above.

[0050] According to this aspect, since the ratio of the portion constituted by the biomass urethane of the pad can be increased, a more environmentally considerate seat can be provided.

Brief Description of the Drawings

[0051]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

MODE FOR CARRYING OUT THE INVENTION

[0052] Hereinafter, embodiments of a seat for a two-wheeled vehicle (hereinafter, seat 1) according to the present invention will be described with reference to the drawings.

[0053] <<First Embodiment>> As shown in FIG. 1, the seat 1 is a straddle-type seat and is provided on the vehicle body 3 of the motorcycle 2. The motorcycle 2 may be either an off-road type or an on-road type.

[0054] Hereinafter, for convenience of explanation, the directions of front-rear, left-right, and up-down are defined with reference to the motorcycle 2, and the explanation will be given. However, the present invention is not limited to the description of these directions.

[0055] The vehicle body 3 may have a main frame 7 that supports the internal combustion engine 6 and a seat frame 8 that extends rearward from the rear upper part of the main frame 7. As shown in FIG. 1, the seat frame 8 has left and right side members 11 that extend rearward from the seat frame 8, a plurality of cross members (not shown) that extend in the left-right direction and are coupled to the left and right side members 11, and left and right reinforcing members 13 that support the left and right side members 11 from below. The left and right reinforcing members 13 may extend rearward and upward from the rear part of the main frame 7 and be coupled to the corresponding left and right side members 11.

[0056] As shown in FIG. 2, the seat 1 has a bottom plate 25, a pad 26, and a skin material 27.

[0057] The bottom plate 25 is coupled to the upper surface of the seat frame 8 that constitutes the vehicle body 3 and is supported by the vehicle body 3. As shown in FIGS. 3 and 4, the bottom plate 25 includes a first bottom plate 28 and a second bottom plate 29.

[0058] The first bottom plate 28 is a plate-like member that extends in the front-rear direction and is formed of, for example, a hard resin material. The first bottom plate 28 is arranged such that its main surface faces the up-down direction and is coupled to the upper part of the seat frame 8 at its lower part. The first bottom plate 28 is supported (specifically, directly supported) by the vehicle body 3. The first bottom plate 28 may be fastened to the left and right side members 11 or the plurality of cross members with screws or the like.

[0059] The first bottom plate 28 is provided with a through hole 30 that penetrates vertically. The through hole 30 is provided at the center in the front-rear direction and the center in the left-right direction of the first bottom plate 28. The through hole 30 is provided at a position that coincides with, for example, the seating area S where the load from the buttocks of the seated person is likely to be applied. Note that the area surrounded by the dashed-dotted line in FIG. 3 corresponds to the seating area S when viewed from above. The seating area S is generally located at the center in the front-rear direction and the center in the left-right direction of the seat 1 when viewed from above.

[0060] The second bottom plate 29 is composed of a plate-like member separate from the first bottom plate 28. The second bottom plate 29 is preferably formed of, for example, a hard resin material. The second bottom plate 29 is substantially square when viewed from above. The second bottom plate 29 is arranged so that its main surface faces the vertical direction and is received in the through hole 30. The second bottom plate 29 is located inside the seating area S when viewed from above.

[0061] The first bottom plate 28 and the second bottom plate 29 are connected by one or more (preferably two or more) support members 32. Thereby, the second bottom plate 29 is floatingly supported by the first bottom plate 28 via the support members 32.

[0062] The support member 32 is belt-shaped and connects the first bottom plate 28 and the second bottom plate 29. The support member 32 has elasticity such as an elastic fabric and is formed of a stretchable cloth material. The support member 32 functions as a cloth spring for floatingly supporting the second bottom plate 29 with respect to the first bottom plate 28.

[0063] In the present embodiment, a plurality of first hole portions 34 are provided in the first bottom plate 28 in order to lock the support member 32. Each of the first hole portions 34 penetrates the first bottom plate 28. The first hole portions 34 are arranged side by side along the edge portion (hereinafter, the inner edge portion 35) that defines the through hole 30 of the first bottom plate 28.

[0064] The second bottom plate 29 is provided with a plurality of second hole portions 36, similar to the first bottom plate 28. Each of the second hole portions 36 penetrates the second bottom plate 29. The second hole portions 36 are arranged side by side along an edge portion (hereinafter referred to as the outer edge portion 37) that defines the outer edge of the second bottom plate 29. The second hole portions 36 are formed at positions aligned in the front-rear or left-right direction so as to correspond to the first hole portions 34.

[0065] The support member 32 includes a strip-shaped support member main body 32A having a thin sheet shape, a first engaging portion 32B provided on one end side of the support member main body 32A, and a second engaging portion 32C provided on the other end side of the support member main body 32A.

[0066] As shown in the enlarged view of FIG. 2, the first engaging portion 32B projects into the first hole portion 34 from above, extends to the lower side of the first bottom plate 28 through the first hole portion 34, and is stitched to the support member main body 32A at its end. Thereby, the support member 32 is coupled to the first bottom plate 28 at the first engaging portion 32B.

[0067] The second engaging portion 32C projects into the second hole portion 36 from above, extends to the lower side of the first bottom plate 28 through the second hole portion 36, and is stitched to the support member main body 32A at its end. Thereby, the support member 32 is coupled to the first bottom plate 28 at the second engaging portion 32C.

[0068] The first hole portions 34 and the second hole portions 36 are respectively provided in the front-rear and left-right directions of the second bottom plate 29. Thereby, the second bottom plate 29 is coupled to the first bottom plate 28 via the support member 32 from four directions of front, rear, left, and right, and is floatingly supported by the first bottom plate 28.

[0069] When the seated person sits down, a downward load is applied to the second bottom plate 29. As a result, the second bottom plate 29 moves downward according to the load, and the support member 32 is elastically deformed, applying a restoring force and a repulsive force to the seated person. When the seated person leaves the seat, the support member 32 returns to its original shape, and the second bottom plate 29 also moves back to its original position.

[0070] The pad 26 is supported on the upper surface of the bottom plate 25. The pad 26 extends back and forth along the upper surface of the bottom plate 25. The pad 26 has an upper surface, left and right side surfaces, and a bottom surface. The upper surface and the bottom surface may be formed horizontally when viewed from the front-rear direction. The left and right side surfaces may be inclined inwardly to the left and right upward.

[0071] The pad 26 has a synthetic resin pad portion 40 and a biomass pad portion 41. Both the synthetic resin pad portion 40 and the biomass pad portion 41 have flexibility.

[0072] The synthetic resin pad portion 40 is formed of a synthetic resin urethane derived from fossil resources such as petroleum. The synthetic resin pad portion 40 may be, for example, a foamed molded body of urethane. In the present embodiment, the synthetic resin pad portion 40 is constituted by a member separate from the biomass pad portion 41. The synthetic resin pad portion 40 has flexibility and may be formed of a material harder than the biomass pad portion 41 (specifically, a material capable of exerting a restoring force and a repulsive force more than biomass urethane).

[0073] In the present embodiment, the synthetic resin pad portion 40 has a substantially square sheet shape in a top view. The width of the synthetic resin pad portion 40 in the front-rear and left-right directions is preferably substantially equal to that of the second bottom plate 29 or slightly smaller than that of the second bottom plate 29.

[0074] The biomass pad portion 41 is constituted by a biomass-filled polyurethane foam or a polyurethane foam mainly made of biomass. The biomass-filled polyurethane may be a cellulose nanocrystal-filled polyurethane, a silica-filled polyurethane, or a corn starch / polyurethane composite. The polyurethane foam mainly made of biomass may contain a polyol synthesized from soybean oil, rapeseed oil, or castor oil.

[0075] As shown in FIG. 2, a receiving recess 43 that is recessed downward is provided on the upper surface of the biomass pad portion 41. The receiving recess 43 is located approximately at the center in both the front-rear and left-right directions of the biomass pad portion 41 in a top view. The synthetic resin pad portion 40 is fitted into the receiving recess 43 and is coupled to the wall surface that defines the receiving recess 43. Thereby, the pad 26 has a two-layer structure in which the upper half is constituted by the synthetic resin pad portion 40 and the lower half is constituted by the biomass pad portion 41 approximately at the center in both the front-rear and left-right directions. The vertical thickness of the biomass pad portion 41 that constitutes the lower half and the vertical thickness of the synthetic resin pad portion 40 that constitutes the upper half may each be, for example, about 25 mm.

[0076] The pad 26 is arranged so as to cover the upper surface of the bottom plate 25. The synthetic resin pad portion 40 is arranged so as to overlap the second bottom plate 29 in the vertical direction at least in part. Thereby, at least a part of the portion that overlaps the seating region S of the pad 26 in the vertical direction is constituted by the synthetic resin pad portion 40.

[0077] In the present embodiment, as shown by the two-dot chain line in FIG. 3, the synthetic resin pad portion 40 is arranged so as to overlap only the second bottom plate 29 in the vertical direction. Thereby, the synthetic resin pad portion 40 is arranged only within the seating region S.

[0078] The biomass pad portion 41 is arranged so as to overlap the first bottom plate 28 in the vertical direction at least in part. In the present embodiment, the biomass pad portion 41 is arranged such that its receiving recess 43 overlaps the second bottom plate 29 in the vertical direction, with the synthetic resin pad portion 40 overlapping the second bottom plate 29 in the vertical direction. The biomass pad portion 41 is in contact with the upper surface of the first bottom plate 28 outside the front, rear, left, and right of the receiving recess 43 and is arranged so as to overlap the first bottom plate 28 and the second bottom plate 29 in the vertical direction.

[0079] The skin material 27 is a sheet-shaped (also referred to as cloth-shaped) member, and is composed of, for example, a synthetic resin. The skin material 27 covers the upper surface and the left and right side surfaces of the pad 26, and covers the edges of the pad 26 and the bottom plate 25. The edge of the skin material 27 extends to the lower surface side of the bottom plate 25 and is joined to the lower surface of the bottom plate 25. For example, one or more hooks may be provided at the edge of the skin material 27, and the skin material 27 may be joined to the lower surface of the bottom plate 25 by hooking the hook to a hooking portion such as a protrusion or a recess provided on the lower surface of the bottom plate 25. When the skin material 27 covers the pad 26, a seating surface is formed on the upper surface of the sheet 1.

[0080] Note that the sheet 1 configured as described above can be manufactured by an operator performing steps of arranging the pad 26 on the upper surface of the bottom plate 25, covering the upper surface and the left and right side surfaces of the pad 26 with the skin material 27, and joining the edge of the skin material 27 to the lower surface of the bottom plate 25.

[0081] Next, the effects of the sheet 1 configured as described above will be described.

[0082] Biomass materials (naturally derived materials such as animals and plants) have attracted attention as materials that can contribute to the reduction of emissions of greenhouse gases such as carbon dioxide (CO 2 ). The applicant is also conducting research and development to convert the plastic materials of vehicle interior parts and various members constituting the sheet 1 from those derived from fossil resources to those derived from plants in order to contribute to the reduction of emissions of greenhouse gases.

[0083] The inventors of the present application conducted research and development to replace the synthetic resin urethane pad used in the sheet with a biomass urethane pad. In the process, the inventors of the present application found that the biomass urethane pad may be less resilient and less repulsive than the synthetic resin urethane pad. Therefore, when simply replacing the synthetic resin urethane pad with a biomass urethane pad, there is a risk that sufficient resilience and repulsive force cannot be imparted to the seated person.

[0084] Therefore, even when using a biomass urethane pad, the inventors of the present application conducted research and development on a seat that can impart sufficient resilience and repulsive force to the seated person, and arrived at the present invention.

[0085] FIG. 2 shows a cross-sectional view of the seat 1 according to the first embodiment of the present invention. As shown in FIG. 2, a part of the pad 26 containing biomass urethane, that is, a part of the biomass pad portion 41, is supported by the vehicle body 3 via the second bottom plate 29.

[0086] When a seated person sits on the seat 1, a downward load is applied to the seating surface, and the second bottom plate 29 moves downward according to the load. As a result, the support member 32 is elastically deformed, and resilience and repulsive force are imparted to the seated person.

[0087] Therefore, by selecting the material of the support member 32 or the like to change (for example, increase) the elastic coefficient, it becomes possible to change the resilience and repulsive force that the portion containing biomass urethane (biomass pad portion 41) imparts to the seated person on the seating surface. Thus, even when a part of the pad 26 is constituted by biomass urethane, sufficient resilience and repulsive force can be imparted to the seated person.

[0088] In the present embodiment, in the portion where the second bottom plate 29 is provided, the pad 26 has a two-layer structure of a synthetic resin pad portion 40 and a biomass pad portion 41. Therefore, compared with the case where it is constituted only by the biomass pad portion 41, the elasticity of the portion of the pad 26 that overlaps the second bottom plate 29 can be increased, so that the resilience and repulsive force imparted to the seated person can be increased.

[0089] In the above embodiment, the shape of the synthetic resin pad portion 40 was configured to be sheet-like, but uneven portions 45 having uneven shapes may be provided on at least one of the lower surface and the upper surface of the synthetic resin pad portion 40.

[0090] Specifically, as shown in FIG. 5(A), the synthetic resin pad portion 40 constitutes the upper half of the portion that vertically overlaps the second bottom plate 29 of the pad 26, and uneven portions 45 may be provided on its lower surface. As shown in FIG. 5(B), the synthetic resin pad portion 40 constitutes the upper half of the portion that vertically overlaps the second bottom plate 29 of the pad 26, and uneven portions 45 may be provided on its upper surface. As the uneven shape constituting the uneven portions 45, various shapes such as a spherical shape, a square tube shape, a cylindrical shape, and a corrugated shape are possible.

[0091] Specific examples of the uneven portions 45 of the synthetic resin pad portion 40 are shown in FIGS. 6(A) to 6(C). As shown in FIG. 6(A), the uneven portions 45 may be formed by arranging concave portions 45A that are recessed in a hemispherical shape at equal intervals in a lattice pattern on at least one of the upper and lower surfaces of the synthetic resin pad portion 40. As shown in FIG. 6(B), the uneven portions 45 may be formed by arranging concave portions 45B that are recessed in a hexagonal column shape at equal intervals in a lattice pattern on at least one of the upper and lower surfaces of the synthetic resin pad portion 40. As shown in FIG. 6(C), the uneven portions 45 may be formed by arranging groove portions 45C that are recessed in a rib shape at equal intervals on at least one (both in the case shown in FIG. 6(C)) of the upper and lower surfaces of the synthetic resin pad portion 40.

[0092] Also, as shown in FIG. 2, the lower half of the portion where the second bottom plate 29 of the pad 26 is provided is constituted by the synthetic resin pad portion 40. However, as shown in FIG. 7(A), a receiving concave portion 46 may be provided on the lower surface of the biomass pad portion 41, and the synthetic resin pad portion 40 may be received in the receiving concave portion 46. Thereby, the lower half of the portion where the second bottom plate 29 of the pad 26 is provided may be constituted by the synthetic resin pad portion 40, and the upper half may also be constituted by the synthetic resin pad portion 40.

[0093] As shown in FIG. 7(B), the biomass pad portion 41 may be provided only in the portion that constitutes the seating surface (that is, the portion that vertically overlaps the second bottom plate 29). However, in the case shown in FIG. 2, compared with the case shown in FIG. 7(B), since the ratio of the portion constituted by the biomass urethane of the pad 26 can be increased, the seat 1 that is more environmentally considerate can be provided.

[0094] As shown in FIGS. 8(A) and 8(B), the synthetic resin pad portion 40 constitutes the lower half of the portion that vertically overlaps the second bottom plate 29 of the pad 26, and uneven portions 45 may be provided on at least one of the lower surface and the upper surface thereof. FIG. 8(A) shows the case where the uneven portions 45 are provided on the lower surface of the synthetic resin pad portion 40, and FIG. 8(B) shows the case where the uneven portions 45 are provided on the upper surface of the synthetic resin pad portion 40.

[0095] Thus, by providing the uneven portions 45 on at least one of the lower surface and the upper surface of the synthetic resin pad portion 40, it becomes possible to locally bend the pad 26. Therefore, it is possible to suppress a decrease in the repulsive feeling by providing the biomass pad portion 41 in the portion overlapping the seating region S of the pad 26.

[0096] <<Second Embodiment>> As shown in FIGS. 9 and 10, in the seat 1 according to the second embodiment, the connection mode between the first bottom plate 28 and the support member 32 and the connection mode between the second bottom plate 29 and the support member 32 are different from those in the first embodiment. Since other configurations are the same as those in the first embodiment, descriptions of other configurations are omitted.

[0097] As shown in FIG. 9, a first wire 51 is provided on an inner edge portion 35 that defines a through hole 30 of a first bottom plate 28 according to the second embodiment. The first wire 51 extends in the circumferential direction along the inner edge portion 35 and has a square frame shape in a top view. In the present embodiment, a plurality of first protruding portions 52 protruding toward the inside of the through hole 30 are provided on the inner edge portion 35 of the first bottom plate 28, and the first wire 51 is inserted through a through hole 53 provided in the first protruding portion 52. Thereby, the first wire 51 is supported by the first bottom plate 28.

[0098] A second wire 55 is provided on an outer edge portion 37 that defines the outer edge of the second bottom plate 29. The second wire 55 extends in the circumferential direction along the outer edge portion 37 and has a square frame shape in a top view. In the present embodiment, a plurality of second protruding portions 56 protruding outward are provided on the outer edge portion 37 of the second bottom plate 29, and the second wire 55 is inserted through a through hole 57 provided in the second protruding portion 56. Thereby, the second wire 55 is supported by the second bottom plate 29.

[0099] As shown in FIG. 10, the second bottom plate 29 is floatingly supported by the first bottom plate 28 via a support member 32. The support member 32 is constituted by a cloth spring as in the first embodiment. As shown in the enlarged view of FIG. 10, the support member 32 includes a belt-shaped support member main body 32A having a thin sheet shape, a first engaging portion 32B provided on one end side of the support member main body 32A, and a second engaging portion 32C provided on the other end side of the support member main body 32A, as in the first embodiment.

[0100] A gap 58 is formed between the first wire 51 and the first bottom plate 28 between adjacent first protruding portions 52. The first engaging portion 32B passes through the gap 58 between the first wire 51 and the first bottom plate 28 from above the first wire 51, extends to the lower side of the first wire 51, and is stitched to the support member main body 32A at its end. Thereby, the support member 32 is coupled to the first wire 51 at the first engaging portion 32B and is connected to the first bottom plate 28 via the first wire 51.

[0101] Between adjacent second protrusions 56, a gap 59 is formed between the second wire 55 and the second bottom plate 29. The second engaging portion 32C passes through the gap 59 between the second wire 55 and the second bottom plate 29 from above the second wire 55, extends to the lower side of the second wire 55, and is stitched to the support member body 32A at its end. Thereby, the support member 32 is coupled to the second wire 55 at the second engaging portion 32C and is connected to the second bottom plate 29 via the second wire 55.

[0102] As shown in FIG. 9, the support members 32 are respectively provided in front and rear and left and right of the second bottom plate 29. Thereby, the second bottom plate 29 is coupled to the first bottom plate 28 from four directions of front, rear, left, and right and is floatingly supported by the first bottom plate 28.

[0103] Similar to the first embodiment, the pad 26 includes a synthetic resin pad portion 40 and a biomass pad portion 41. In the example shown in FIG. 10, the biomass pad portion 41 is arranged so as to overlap the second bottom plate 29 from above. The pad 26 has a two-layer structure in which the upper half is constituted by the synthetic resin pad portion 40 and the lower half is constituted by the biomass pad portion 41 in a portion that overlaps the second bottom plate 29 in the vertical direction.

[0104] Next, the effects of the sheet 1 configured as described above will be described. The first wire 51 is provided along the inner edge portion 35 of the first bottom plate 28. The second wire 55 is provided along the outer edge portion 37 of the second bottom plate 29. The support member 32 connects the first wire 51 and the second wire 55 and functions as a cloth spring that floatingly supports the second bottom plate 29 with respect to the first bottom plate 28.

[0105] Therefore, similar to the first embodiment, by changing (for example, increasing) the elastic coefficient of the support member 32, it becomes possible to increase the restoring force and repulsive force applied to the seated person in the portion containing the biomass urethane. Therefore, even when a part of the pad 26 is constituted by the biomass urethane, sufficient restoring force and repulsive force can be imparted to the seated person.

[0106] In addition, since the first wire 51 is provided on the first bottom plate 28 and the second wire 55 is provided on the second bottom plate 29, the support member 32 can be favorably coupled to the first bottom plate 28 and the second bottom plate 29.

[0107] In the second embodiment, the first wire 51 was provided on the first bottom plate 28 and the second wire 55 was provided on the second bottom plate 29, but the present invention is not limited to this aspect.

[0108] For example, the first wire 51 is provided on the first bottom plate 28, the second hole portion 36 similar to that of the first embodiment is provided on the second bottom plate 29, and the support member 32 is coupled to the first wire 51 at one end, and at the other end, similar to the first embodiment, passes through the second hole portion 36 and is configured to be sutured to the support member main body 32A.

[0109] Alternatively, the first hole portion 34 similar to that of the first embodiment is provided on the first bottom plate 28, the second wire 55 is provided on the second bottom plate 29, and the support member 32 passes through the first hole portion 34 of the first bottom plate 28 at one end, is sutured to the support member main body 32A, and is configured to be coupled to the second wire 55 at the other end.

[0110] <<Third Embodiment>> As shown in FIGS. 11 and 12, the sheet 1 according to the third embodiment is different from the second embodiment in that a support member (hereinafter also referred to as a mounting member 60 or a hook) having a shape different from that of the support member 32 in the first and second embodiments is provided on the second bottom plate 29. Other configurations are the same as those in the second embodiment. Therefore, descriptions of the same parts as those in the second embodiment will be omitted.

[0111] As shown in FIG. 11, the second bottom plate 29 has a frame body 61 (also referred to as a frame) that forms a skeleton and a cloth member 62 stretched over the frame body 61. The frame body 61 is composed of metal wires. The frame body 61 has a square frame shape and defines the outer edge of the second bottom plate 29.

[0112] Similar to the support member 32 in the first embodiment, the cloth member 62 is formed of an elastic cloth material such as an elastic woven fabric and has elasticity and is stretchable. The cloth member 62 has a square shape and is joined to the frame body 61 at its outer edge portion 37. Thereby, the cloth member 62 is stretched inside the frame body 61. The cloth member 62 functions as a cloth spring that applies a biasing force against an upward load applied to the center in its front-rear and left-right directions.

[0113] As shown in FIG. 12, the mounting member 60 is composed of a metal plate material and connects the first bottom plate 28 and the second bottom plate 29. By the mounting member 60, the second bottom plate 29 is connected to and supported by the first bottom plate 28. That is, the mounting member 60 functions as a support member that supports the second bottom plate 29 on the first bottom plate 28. In this embodiment, the mounting member 60 has a belt shape that connects the first bottom plate 28 and the second bottom plate 29.

[0114] As shown in the enlarged view of FIG. 12, a first wire 51 is provided on the first bottom plate 28, similar to the second embodiment. One end of the mounting member 60 is provided with a first latching portion 63 that is latched to the first wire 51. By latching the first latching portion 63 to the first wire 51, the mounting member 60 is coupled to the first bottom plate 28 at one end side.

[0115] The other end of the mounting member 60 is provided with a second latching portion 64 that is latched to the frame body 61. By latching the second latching portion 64 to the frame body 61, the mounting member 60 is coupled to the second bottom plate 29 at the other end side.

[0116] The mounting member 60 is coupled to the first bottom plate 28 at the first latching portion 63 and to the second bottom plate 29 at the second latching portion 64. Thereby, the first bottom plate 28 and the second bottom plate 29 are connected, and the second bottom plate 29 is supported by the first bottom plate 28.

[0117] Similar to the second embodiment, the pad 26 includes a synthetic resin pad portion 40 and a biomass pad portion 41. As shown in FIG. 12, the synthetic resin pad portion 40 is disposed so as to overlap the second bottom plate 29 from above.

[0118] Next, the effects of the sheet 1 configured as described above will be described. The biomass pad portion 41 is provided on the cloth member 62 stretched over the frame body 61 of the second bottom plate 29 at a portion overlapping the seating area S. Therefore, when a load from the seated person is applied to the seating area S, a restoring force and a repulsive force are applied to the seated person from the cloth member 62. Thus, even when a part of the pad 26 (biomass pad portion 41) is made of biomass urethane, it is possible to apply sufficient restoring force and repulsive force to the seated person.

[0119] <<Fourth Embodiment>> As shown in FIGS. 13 and 14, the sheet 1 according to the fourth embodiment includes a first bottom plate 28 made of a resin plate and a second bottom plate 29 made of a resin plate, which are the same as those in the first embodiment. Similar to the first embodiment, a through hole 30 penetrating in the vertical direction is provided at the center of the first bottom plate 28 in the front-rear direction and the left-right direction, and the second bottom plate 29 is received in the through hole 30. However, in the sheet 1 according to the fourth embodiment, the connection mode between the first bottom plate 28 and the second bottom plate 29 is different from that in the first embodiment.

[0120] A sealing member 70 is provided between the inner edge portion 35 defining the through hole 30 of the first bottom plate 28 and the outer edge portion 37 of the second bottom plate 29.

[0121] As shown in FIGS. 13 and 14, the sealing member 70 (also referred to as a packing) is made of a flexible and elastic material such as rubber. The sealing member 70 forms an annular shape extending along the inner edge portion 35. In this embodiment, as shown in the enlarged view of FIG. 14, the sealing member 70 includes a flange portion 71 extending along the inner edge portion 35 and a cylindrical portion 72 extending downward from the inner edge of the flange portion 71. The flange portion 71 has a substantially square frame shape in top view. The cylindrical portion 72 has a square cylindrical shape extending downward and has a hole (hereinafter, inner hole 73) extending vertically inside. The flange portion 71 extends outward from the upper end of the cylindrical portion 72 and extends on the upper surface of the first bottom plate 28.

[0122] The second bottom plate 29 is placed on the sealing member 70. Thereby, the first bottom plate 28 and the second bottom plate 29 are connected via the sealing member 70. That is, the second bottom plate 29 is elastically supported by the first bottom plate 28 via the sealing member 70. Thereby, the sealing member 70 functions as a support member that floatingly supports the second bottom plate 29 with respect to the first bottom plate 28.

[0123] In this embodiment, the second bottom plate 29 includes a flat plate portion 74 having a substantially rectangular shape in a top view, and a protruding portion 75 extending downward from the plate portion 74. The protruding portion 75 protrudes into the inner hole 73 of the cylindrical portion 72. In this embodiment, the protruding portion 75 has a rectangular cylindrical shape extending in the vertical direction.

[0124] The outer peripheral surface of the protruding portion 75 has a shape that matches the inner hole 73 of the cylindrical portion 72. The protruding portion 75 is in contact with the wall surface that defines the inner hole 73 of the cylindrical portion 72 on its outer peripheral surface. Thereby, the movement of the protruding portion 75 in the front-rear and left-right directions is prevented.

[0125] Similar to the first embodiment, the pad 26 includes a synthetic resin pad portion 40 and a biomass pad portion 41. In the example shown in FIG. 14, the synthetic resin pad portion 40 is arranged so as to overlap the second bottom plate 29 from above.

[0126] Next, the effects of the sheet 1 configured as described above will be described. The second bottom plate 29 is floatingly supported by the first bottom plate 28 via a sealing member 70. Therefore, even when the biomass pad portion 41 is arranged so as to overlap the seating area S, it is possible to increase the restoring force and repulsive force applied to the seated person by changing the elastic coefficient of the sealing member 70. Therefore, even when a part of the pad 26 is made of biomass urethane, sufficient restoring force and repulsive force can be imparted to the seated person.

[0127] Although the description of the specific embodiments has been completed above, the present invention can be widely modified and implemented without being limited to the above embodiments.

[0128] In the above embodiment, one through hole 30 is provided in the substantially central portion of the first bottom plate 28 in the front-rear direction and the left-right direction, and one second bottom plate 29 is floatingly supported inside the through hole 30, but the present invention is not limited to this aspect.

[0129] As shown in FIGS. 15 and 16, notch portions 81 each notched inward are provided at both left and right edges of the first bottom plate 28, and the second bottom plate 29 may be floatingly supported inside each of the notch portions 81. Thereby, the second bottom plate 29 is disposed on the left and right sides of the first bottom plate 28, respectively. The notch portions 81 may be provided so as to overlap the seating region S in top view. In FIG. 15, the seating region S is shown as a region surrounded by a dashed line.

[0130] In the example shown in FIG. 15, a first hole portion 34 and a second hole portion 36 similar to those of the first embodiment are provided in the first bottom plate 28 and the second bottom plate 29, respectively. As shown in the enlarged view of FIG. 16, a support member 32 formed of an elastic cloth may be coupled to the first hole portion 34 of the first bottom plate 28 and the second hole portion 36 of the second bottom plate 29. In this case, as shown by the two-dot chain line in FIG. 15, the synthetic resin pad portion 40 may be disposed so as to straddle the two second bottom plates 29. Thereby, since the synthetic resin pad portion 40 is disposed so as to overlap the seating region S in top view, sufficient restoring force and repulsive force can be imparted to the seated person. At this time, as shown in FIG. 16, a housing recess 46 may be provided on the lower surface of the biomass pad portion 41, and the synthetic resin pad portion 40 and the first bottom plate 28 may be disposed so as to cover them from above.

Explanation of Signs

[0131] 1: Seat (an example of a seat for a two-wheeled vehicle) 25: Bottom plate 26: Pad 28: First bottom plate 29: Second bottom plate 30: Through hole 32: Support member 34: First hole portion (an example of a hole portion) 35: Inner edge portion 36: Second hole portion (an example of a hole portion) 37: Outer edge portion 40: Biomass pad portion 41: Synthetic resin pad part 45: Concave-convex part 51: First wire (an example of a wire) 53: Through hole 55: Second wire (an example of a wire) 57: Through hole 60: Mounting member (a modified example of a support member) 61: Frame body 62: Cloth member 70: Sealing member (a modified example of a support member) 71: Flange part 72: Cylindrical part 73: Inner hole 74: Plate part 75: Insertion part

Claims

1. A motorcycle seat, A bottom plate supported by the vehicle body; A pad including biomass urethane and supported by the bottom plate; the bottom plate includes a first bottom plate supported by the vehicle body and a second bottom plate supported by the first bottom plate via a support member, At least a portion of the pad is supported by the second bottom plate.

2. the first bottom plate has a through hole for receiving the second bottom plate; 2. The motorcycle seat according to claim 1, wherein an inner edge portion of the first bottom plate that defines the through hole and an outer edge portion of the second bottom plate are connected by the support member that is flexible.

3. The motorcycle seat according to claim 2 , wherein at least one of the first bottom plate and the second bottom plate is provided with a hole for passing the support member therethrough.

4. 3. The motorcycle seat according to claim 2, wherein at least one of the inner edge portion of the first bottom plate and the outer edge portion of the second bottom plate is provided with a wire that extends in a circumferential direction and to which the support member is hooked.

5. The motorcycle seat according to claim 1 , wherein the second bottom plate includes a frame body that defines an outer edge, and a cloth member that is stretched across an inside of the frame body.

6. the first bottom plate has a through hole for receiving the second bottom plate; 2. The motorcycle seat according to claim 1, wherein the support member resiliently supports the second bottom plate on the first bottom plate between an inner edge portion that defines the through hole of the first bottom plate and an outer edge portion of the second bottom plate.

7. the support member includes a cylindrical portion having an inner hole and inserted into the through hole, and an annular flange portion extending from an upper end of the cylindrical portion onto an upper surface of the first bottom plate, The motorcycle seat according to claim 6, wherein the second bottom plate includes a plate portion and a protruding portion that protrudes from the plate portion into an inner hole of the cylindrical portion.

8. The pad has a biomass pad portion formed from the biomass urethane and a synthetic resin pad portion formed from synthetic resin urethane, The motorcycle seat according to claim 1 , wherein the synthetic resin pad portion is disposed so as to overlap, at least in part, the second bottom plate in the vertical direction.

9. The motorcycle seat according to claim 8, wherein at least one of an upper surface and a lower surface of the synthetic resin pad portion is provided with an uneven portion having an uneven shape.

10. The motorcycle seat according to claim 8, wherein the biomass pad portion and the synthetic resin pad portion are disposed so as to overlap each other in the vertical direction at least in part.

11. The motorcycle seat according to claim 8 , wherein the biomass pad portion is disposed so as to overlap the second bottom plate and the first bottom plate from above.

Images