Vehicle seats

Abstract

To obtain a vehicle seat that can suppress the bouncing of the seat cushion when it is returned to the seating position after being flipped up. [Solution] The seat cushion is designed to be flipped up. A cushioning member 40 is attached to the underside of the seat cushion, and this cushioning member 40 has a projection 44 that protrudes on the side opposite to the seat cushion. In addition, the underframe portion 36, which constitutes the frame part below the seat relative to the seat cushion, has a fitting portion 50 into which the projection 44 elastically deforms and fits.

Description

Technical Field

[0001] The present invention relates to a vehicle seat.

Background Art

[0002] A vehicle seat in which a seat cushion can be flipped up is known (see, for example, Patent Document 1 below). In such a vehicle seat, a cushioning member may be attached to a lower surface side of the seat cushion.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] However, in such a vehicle seat, when the flipped-up seat cushion is returned to a seating position, the seat cushion bounces.

[0005] In view of the above facts, an object of the present invention is to provide a vehicle seat that can suppress bouncing of the seat cushion when the flipped-up seat cushion is returned to the seating position.

Means for Solving the Problem

[0006] The vehicle seat according to a first aspect comprises: a seat back that supports the back of a seated occupant; a seat cushion that supports the buttocks and thighs of a seated occupant and can be flipped up; a cushioning member attached to the lower surface side of the seat cushion, the cushioning member being formed with a protrusion protruding to the side opposite to the seat cushion side; and an underframe portion that constitutes a skeleton portion on a seat lower side with respect to the seat cushion, the underframe portion being formed with a fitted portion into which the protrusion is fitted by being elastically deformed.

[0007] According to the first embodiment of the vehicle seat, the seat back supports the occupant's back, and the seat cushion supports the seated occupant's buttocks and thighs and is also flipped up. A cushioning member is attached to the underside of the seat cushion, and this cushioning member has a projection that protrudes on the side opposite to the seat cushion. Here, the underframe, which constitutes the skeletal part below the seat relative to the seat cushion, has a fitting portion that the projection elastically deforms and fits into. As a result, when the flipped-up seat cushion is returned to the seating position, the projection of the cushioning member elastically deforms and fits into the fitting portion of the underframe, thereby suppressing the seat cushion from bouncing.

[0008] In the second embodiment of the vehicle seat, the fitting portion is formed in a perforated shape and has a tapered surface that decreases in diameter from the upper end opening to the lower end opening.

[0009] According to the second embodiment of the vehicle seat, the fitting portion is formed in a perforated shape and has a tapered surface that decreases in diameter from the upper end opening to the lower end opening, so that the projection of the cushioning member can be elastically deformed and fitted with a simple configuration.

[0010] In the third embodiment of the vehicle seat, in the first or second embodiment, the projection has a tapered portion that is tapered toward the protruding tip when not fitted into the fitting portion.

[0011] According to the third embodiment of the vehicle seat, the projection of the cushioning member has a tapered portion that is tapered toward the protruding tip when it is not fitted into the mating portion, making it easy to fit the projection of the cushioning member into the mating portion of the underframe.

[0012] In the fourth embodiment of the vehicle seat, in any one embodiment of the first to third embodiments, a hole is formed in the projection along its central axis.

[0013] According to the fourth embodiment of the vehicle seat, a hole is formed in the projection along its central axis, so when the projection fits into the fitting portion of the underframe, the projection is more likely to collapse toward its central axis, making it easier for the projection to fit into the fitting portion.

[0014] In the fifth embodiment of the vehicle seat, in the second embodiment, the projection is set such that, when the projection is fitted into the fitting portion, the lower end of the projection is located above the lower end opening, which is the lower end of the tapered surface.

[0015] According to the fifth embodiment of the vehicle seat, when the projection of the cushioning member is fitted into the fitting portion of the underframe, the lower end of the projection is located above the seat, above the lower end opening which is the lower end of the tapered surface in the fitting portion. Therefore, when the seat cushion is flipped up from the state in which the projection is fitted into the fitting portion, it is possible to avoid the projection catching on the edge of the lower end opening of the fitting portion and being cut.

[0016] In the sixth embodiment of the vehicle seat, in any one embodiment of the first to fifth embodiments, a plurality of protrusions are formed on the outer periphery of the projection, arranged at intervals in the circumferential direction of the projection and extending along the projection direction of the projection.

[0017] According to the sixth embodiment of the vehicle seat, a plurality of protrusions formed on the outer circumference of the projection are arranged at intervals in the circumferential direction of the projection and extend along the projection direction of the projection. Therefore, when the projection is fitted into the mating portion, the plurality of protrusions are compressed and the projection is press-fitted. As a result, the degree of fitting between the projection and the mating portion can be adjusted by the plurality of protrusions, making it easy to set the degree of fitting between the projection and the mating portion to a desirable state.

[0018] In the vehicle seat according to the seventh aspect, in any one of the first to sixth aspects, the buffer member is formed with an annular projecting portion that protrudes in the same direction as the projecting portion along the entire circumference of an outer peripheral portion of a surface on which the projecting portion is formed, and is capable of coming into contact with an upper surface of the underframe portion.

[0019] According to the vehicle seat of the seventh aspect, the annular projecting portion, which protrudes in the same direction as the projecting portion along the entire circumference of the outer peripheral portion of the surface of the buffer member on which the projecting portion is formed, is capable of coming into contact with the upper surface of the underframe portion. Accordingly, when the flipped-up seat cushion is returned to the seating position and the buffer member comes into contact with the upper surface of the underframe portion, the annular projecting portion first comes into contact with the upper surface of the underframe portion and is elastically deformed. Therefore, the initial load when the buffer member comes into contact with the upper surface of the underframe portion can be controlled by the annular projecting portion.

Effects of the Invention

[0020] As described above, the vehicle seat according to the present invention has an excellent effect that it is possible to suppress bouncing of the seat cushion when the flipped-up seat cushion is returned to the seating position.

Brief Description of Drawings

[0021] [Figure 1] It is a perspective view showing a vehicle seat as the vehicle seat according to the first embodiment. [Figure 2] It is a perspective view showing a frame portion in a portion including a lower part of the vehicle seat of FIG. 1. [Figure 3] It is a side view showing a state where a seat cushion that has been tipped up is returned to a seating position, and the like. [Figure 4] It is a perspective view showing a state where a buffer member attached to a front portion of a side frame is supported by an underframe portion. [Figure 5] It is an enlarged cross-sectional view showing a state cut along line 5-5 in FIG. 4. [Figure 6]It is an enlarged perspective view showing the buffer member of FIG. 4. [Figure 7] It is a perspective view showing a buffer member applied to a vehicle seat according to a second embodiment. [Figure 8] It is a longitudinal cross-sectional view showing a state where a protrusion of the buffer member of FIG. 7 is fitted into a fitting portion of an under frame portion. MODE FOR CARRYING OUT THE INVENTION

[0022] [First Embodiment] Hereinafter, a vehicle seat 10 as a vehicle seat according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 6. In the drawings, arrows FR, UP, and LH appropriately shown indicate the forward direction, upward direction, and left direction of the vehicle seat 10, respectively. Hereinafter, when the description is simply made using the directions of front-rear, up-down, and left-right, unless otherwise specified, they refer to front and rear in the seat front-rear direction, up and down in the seat up-down direction, and left and right in the seat left-right direction (seat width direction). In addition, in each drawing, some reference numerals may be omitted for the purpose of making the drawings easy to read.

[0023] FIG. 1 is a perspective view of a vehicle seat 10 disposed in a vehicle cabin. The vehicle seat 10 includes a seat cushion 12 that supports the buttocks and thighs of a seated occupant, a seat back 14 that supports the back of the seated occupant, and a headrest 16 that supports the head of the seated occupant. FIG. 2 is a perspective view showing a frame structure in a portion including the lower part of the vehicle seat 10. In FIG. 2, a part of the outer shape of the vehicle seat 10 is indicated by a two-dot chain line.

[0024] The seat back 14 shown in Figures 1 and 2 comprises a seat back pad (not shown) and a seat back frame 18 (see Figure 2) that supports the seat back pad from the rear side of the seat. The seat back pad is made of a foam material such as urethane foam, and the surface of the seat back pad is covered with a seat back skin 14E (see Figure 1). The seat cushion 12 comprises a seat cushion pad (not shown) and a seat cushion frame 20 (see Figure 2) that supports the seat cushion pad from the lower side of the seat. The seat cushion pad is made of a foam material such as urethane foam, and the surface of the seat cushion pad is covered with a seat cushion skin 12E (see Figure 1).

[0025] As shown in Figure 2, the seat cushion frame 20 includes a pair of left and right side frames 22, a front pipe 24 connecting the left and right side frames 22 and positioned in the portion including the front of the seat cushion 12, and a rear pipe 26 connecting the left and right side frames 22 and positioned in the portion towards the rear end of the seat cushion 12.

[0026] The side frame 22 is made of a metal plate and forms part of the side of the seat cushion frame 20, extending in the front-rear direction of the seat. The side frame 22 is formed in a bent plate shape and has a vertical wall portion 22A arranged with the seat width direction as the plate thickness direction, an upper flange portion 22B bent inward in the seat width direction from the upper end of the vertical wall portion 22A, a lower flange portion 22C bent inward in the seat width direction from the lower end of the vertical wall portion 22A, and a rear flange portion 22D bent inward in the seat width direction from the rear end of the vertical wall portion 22A. The vertical wall portion 22A of the side frame 22 has a shape that extends upward toward the seat at its rear.

[0027] The front pipe 24 is made of a metal pipe material and bent into a U shape. The front pipe 24 is positioned so that the open side of the U shape faces the rear of the seat in a plan view, and has a widthwise extending portion 24A that extends in the seat width direction and a side portion 24B that extends in the seat front-rear direction. The widthwise extending portion 24A of the front pipe 24 is positioned on the front end side of the seat cushion 12. The rear part of the side portion 24B of the front pipe 24 is positioned between the upper flange portion 22B and the lower flange portion 22C on the seat width side relative to the vertical wall portion 22A of the side frame 22, and is fixed to the side frame 22.

[0028] The rear pipe 26 is made of a metal pipe material and extends in the direction of the seat width. The rear pipe 26 is positioned further rearward from the seat than the rear end of the side portion 24B of the front pipe 24. Both ends of the rear pipe 26 in the direction of the seat width are fixed to the rear of the vertical wall portion 22A of the side frame 22.

[0029] A wire 28 is stretched between the widthwise extending portion 24A of the front pipe 24 and the rear pipe 26. Additionally, a wire 29 is stretched between the left and right pair of side frames 22. Wires 28 and 29 are arranged in a grid pattern.

[0030] On both sides of the rear of the seat cushion frame 20, vertical wall portions 30A of cushion side frames 30, which are supported on the vehicle floor side (not shown), are positioned adjacent to each other. The cushion side frame 30 is made of a metal plate and is formed in a bent plate shape. Specifically, the cushion side frame 30 has a vertical wall portion 30A positioned with the seat width direction as the plate thickness direction at a position including the side of the side frame 22 in the normal use state, a lower wall portion 30C positioned with the seat vertical direction as the plate thickness direction at a position including a position spaced apart below the seat from the side frame 22 in the normal use state, and an inclined wall portion 30B that connects the lower end of the vertical wall portion 30A and the outer end of the lower wall portion 30C in the seat width direction and inclined inward in the seat width direction toward the seat downward. The rear and lower parts of the pair of left and right cushion side frames 30 are connected by a metal pipe 32 that extends in the seat width direction.

[0031] The rear upper part of the vertical wall portion 30A of the cushion side frame 30 and the rear upper part of the vertical wall portion 22A of the side frame 22 of the seat cushion frame 20 are connected by a connecting shaft 34 so as to be rotatable relative to each other around an axis in the seat width direction. In the vehicle seat 10, a pair of connecting shafts 34 are provided on both sides in the seat width direction (the connecting shaft 34 on the left side of the seat is not shown in the figure), and as shown in Figure 3, the seat cushion frame 20 is rotatable around the axis of the connecting shaft 34 (see arrows R1 and R2). As a result, the seat cushion 12 shown in Figure 1 is configured to be flipped up, or more specifically, to be flipped up from the normal seating position (the state shown in Figure 1) to a tip-up state (not shown) where it is flipped up towards the rear of the seat along the seat back 14. Note that a locking mechanism for locking the seat cushion 12 in the tip-up state (broadly speaking, the flipped-up state) and a release mechanism for releasing said lock can be applied using a known configuration, so a description is omitted.

[0032] As shown in Figure 2, an underframe portion 36 is fixed to the front of the cushion side frame 30, positioned inward in the seat width direction relative to its vertical wall portion 30A and inclined wall portion 30B, and above the seat relative to the lower wall portion 30C. The underframe portion 36 constitutes the lower frame portion of the seat cushion 12, and is provided in pairs, for example, on the left and right sides. This underframe portion 36 is formed in a platform shape and has a top plate portion 36A positioned with the sheet thickness direction in the vertical direction of the sheet, and vertical wall portions 36B that are bent and hang down from the front and rear ends of the top plate portion 36A, respectively. The top plate portion 36A of the underframe portion 36 is located below the seat relative to the front of the side frame 22.

[0033] Figure 4 shows an enlarged and simplified perspective view of the right side of the seat, including the front part of the side frame 22 and the underframe part 36. As shown in Figure 4, a mounting base 22P is formed on a part of the lower flange part 22C at the front of the side frame 22. The mounting base 22P extends inward in the seat width direction compared to the general part 22C1 of the lower flange part 22C, and is further set back from the general part 22C1 of the lower flange part 22C.

[0034] A cushioning member 40 is fixed to the underside of the mounting base 22P. In other words, the cushioning member 40 is attached to the underside of the seat cushion 12 (see Figure 1). The cushioning member 40 is made of rubber. Figure 5 shows an enlarged cross-sectional view taken along the line 5-5 in Figure 4, and Figure 6 shows an enlarged perspective view of the cushioning member 40.

[0035] As shown in Figures 5 and 6, the cushioning member 40 has a cylindrical main body 42 and a projection 44 that protrudes from one axial side of the main body 42 and has a smaller diameter than the main body 42. The projection 44 is short cylindrical and protrudes on the side opposite to the seat cushion 12 (see Figure 2, etc.). As shown in Figure 5, a central hole 40H is formed through the cushioning member 40 along its central axis 40X. In Figure 5, the hole formed in the main body 42 along its central axis, which constitutes a part of the central hole 40H, is denoted by reference numeral 42H, and the hole formed in the projection 44 along its central axis, which constitutes another part of the central hole 40H, is denoted by reference numeral 44H.

[0036] An insert 46 is embedded in the main body 42 at the end opposite to the projection 44. The male thread of a tapping screw 48 is screwed into the female thread of the insert 46. The tapping screw 48 is inserted into the central hole 40H of the cushioning member 40 from the hole 44H side, passes through the insert 46, and is then screwed into the mounting base 22P, passing through the mounting base 22P, thereby fixing (fastening) the cushioning member 40 to the mounting base 22P. The central hole 40H of the cushioning member 40 can be grasped as a screw hole.

[0037] On the other hand, the top plate portion 36A of the underframe portion 36 has a fitting portion 50 into which the projection 44 of the cushioning member 40 is elastically deformed and fitted. The fitting portion 50 is formed in the shape of a hole (for example, a circular hole) and has a tapered surface 52 that decreases in diameter from the upper end opening 50A to the lower end opening 50B. To further explain, the fitting portion 50 is a fitting hole formed by burring the top plate portion 36A of the underframe portion 36, and includes the inner circumferential surface of a tapered cylindrical portion 54 that protrudes downward from the top plate portion 36A.

[0038] Furthermore, when the projection 44 is fitted into the mating portion 50, the lower end of the projection 44 is positioned above the sheet, above the lower end opening 50B, which is the lower end of the tapered surface 52 of the mating portion 50. In Figure 5, the initial shape of the projection 44 of the cushioning member 40 is shown by a dashed line. As shown in Figure 5, the projection 44 is fitted into the mating portion 50 in a crushed state. Also, when the projection 44 is fitted into the mating portion 50, the surface 42A on the main body portion 42 of the cushioning member 40 on which the projection 44 is formed is in surface contact with the upper surface 36A1 of the top plate portion 36A of the underframe portion 36.

[0039] Next, the operation and effects of this embodiment will be described.

[0040] In this embodiment, the seat cushion 12 shown in Figure 1 supports the buttocks and thighs of the seated occupant and can be flipped up (for example, it can be flipped up to a tip-up state along the seat back 14). A cushioning member 40, shown in Figure 2, etc., is attached to the lower surface of the seat cushion 12, and this cushioning member 40 has a projection 44, shown in Figure 3, etc., that protrudes on the side opposite to the seat cushion 12. Here, the underframe portion 36, which constitutes the skeletal part below the seat relative to the seat cushion 12 shown in Figure 2, has a fitting portion 50 formed therein, as shown in Figure 5, into which the projection 44 elastically deforms and fits. As a result, when the seat cushion 12 (see Figure 1) is returned from the flipped-up state (for example, the tip-up state) to the seating position, the projection 44 of the cushioning member 40 elastically deforms and fits into the fitting portion 50 of the underframe portion 36, thereby suppressing the seat cushion 12 from bouncing.

[0041] Furthermore, in this embodiment, the fitted portion 50 is formed in a hole shape and has a tapered surface 52 that decreases in diameter from the upper end opening 50A to the lower end opening 50B, so that the projection 44 of the cushioning member 40 can be elastically deformed and fitted with a simple configuration. That is, from the time the cushioning member 40 and the underframe portion 36 begin to come into contact until the cushioning member 40 is positioned in the normal use position shown in Figure 5, the projection 44 of the cushioning member 40 can be gradually fitted into the fitted portion 50 of the underframe portion 36 while absorbing the impact.

[0042] Furthermore, in this embodiment, a hole 44H is formed in the projection 44 along its central axis. Therefore, when the projection 44 is fitted into the fitting portion 50 of the underframe portion 36, the projection 44 is more likely to be crushed toward its central axis, making it easier for the projection 44 to fit into the fitting portion 50.

[0043] As explained above, the vehicle seat 10 of this embodiment shown in Figure 1 makes it possible to suppress the bouncing (flapping) of the seat cushion 12 when it is returned to the seating position after being flipped up.

[0044] Furthermore, in this embodiment, as shown in Figure 5, when the projection 44 of the cushioning member 40 is fitted into the fitting portion 50 of the underframe portion 36, the lower end position of the projection 44 is located above the seat, above the lower end opening 50B which is the lower end of the tapered surface 52 of the fitting portion 50. Therefore, when the seat cushion 12 (see Figure 1) is flipped up from the state in which the projection 44 is fitted into the fitting portion 50, it is possible to avoid the projection 44 catching on the edge of the lower end opening 50B of the fitting portion 50 and being cut.

[0045] [Second Embodiment] Next, a vehicle seat as a passenger seat according to the second embodiment of the present invention will be described with reference to Figures 7 and 8. Figure 7 shows a perspective view of the cushioning member 60 applied to the vehicle seat according to the second embodiment, and Figure 8 shows a cross-sectional view (corresponding to Figure 5 of the first embodiment) of the cushioning member 60 attached to the side frame 22 and positioned in the normal use position. In the vehicle seat according to the second embodiment, the cushioning member 60 shown in Figures 7 and 8 is applied in place of the cushioning member 40 of the first embodiment (see Figures 5 and 6, etc.). Other components of the vehicle seat according to the second embodiment are substantially the same as those of the vehicle seat 10 according to the first embodiment (see Figures 1 to 5). Therefore, components that are substantially the same as those in the first embodiment in the second embodiment are denoted by the same reference numerals and their descriptions are omitted as appropriate.

[0046] The cushioning member 60 shown in Figures 7 and 8 is made of rubber and consists of a cylindrical main body 62 and a projection 64 that protrudes from the center of one axial side of the main body 62 and has a smaller diameter than the main body 62. The projection 64 protrudes on the side opposite to the seat cushion 12 (see Figure 2, etc.).

[0047] As shown in Figure 8, the cushioning member 60 has a central hole 60H formed through it along its central axis 60X. In Figure 8, a portion of the central hole 60H that is formed along its central axis in the main body portion 62 is denoted by reference numeral 62H, and another portion of the central hole 60H that is formed along its central axis in the projection portion 64 is denoted by reference numeral 64H.

[0048] The configuration for fixing (fastening) the cushioning member 60 to the lower surface of the mounting base 22P is substantially the same as the configuration for fixing (fastening) the cushioning member 40 (see Figure 5, etc.) to the lower surface of the mounting base 22P in the first embodiment. That is, an insert 46 is embedded in the main body 62 at the part opposite to the projection 64 side (in this case, the end), and the male thread of a tapping screw 48 is screwed into the female thread of the insert 46. The tapping screw 48 is inserted into the central hole 60H of the cushioning member 60 from the hole 64H side, passes through the insert 46, and is then screwed into the mounting base 22P, passing through the mounting base 22P, thereby fixing the cushioning member 60 to the mounting base 22P. The central hole 60H of the cushioning member 60 can be grasped as a screw hole.

[0049] The projection 64 of the cushioning member 60 is designed to elastically deform and fit into the fitting portion 50 formed on the top plate portion 36A of the underframe portion 36. The fitting portion 50 differs slightly in dimensions from the fitting portion 50 of the first embodiment (see Figure 5), but since it is substantially the same component as the fitting portion 50 of the first embodiment (see Figure 5), the same reference numerals are used and its description is omitted.

[0050] Furthermore, when the projection 64 is fitted into the mating portion 50, the lower end of the projection 64 is positioned above the lower end opening 50B, which is the lower end of the tapered surface 52 of the mating portion 50. In Figure 8, the initial shape of the projection 64 of the cushioning member 60 is shown by a dashed line. As shown in Figure 8, the projection 64 is designed to fit into the mating portion 50 in a flattened state.

[0051] As shown in Figure 7, the projection 64 has a tapered portion 64A that is tapered toward the protruding tip when it is not fitted into the mating portion 50 (see Figure 8). In addition, a plurality of protrusions 64C are formed on the outer circumference of the projection 64, spaced apart in the circumferential direction of the projection 64 and extending along the direction of projection of the projection 64. For example, the protrusions 64C are formed continuously with the surface 62A on which the projection 64 is formed on the main body portion 62 of the cushioning member 60.

[0052] Furthermore, the cushioning member 60 has an annular projection 66 that protrudes in the same direction as the projection 64 along the entire circumference of the outer periphery of the surface 62A on which the projection 64 is formed. The annular projection 66 has a circular tip 66A, and its inner surface 66B facing the projection 64 is an inclined surface that slopes radially outward from the cushioning member 60 in the direction of the projection of the annular projection 66. As shown in Figure 8, the annular projection 66 is such that its tip 66A can abut against the upper surface 36A1 of the top plate portion 36A of the underframe portion 36.

[0053] The configuration of the second embodiment described above also provides the same effects and benefits as the first embodiment described above.

[0054] Furthermore, according to the second embodiment, the projection 64 of the cushioning member 60 has a tapered portion 64A that is tapered toward the protruding tip when it is not fitted into the fitted portion 50, making it easier to crush the projection 64 of the cushioning member 60 within the fitted portion 50 of the underframe portion 36 and easier to fit the projection 64 into the fitted portion 50. In addition, the formation of the tapered portion 64A on the projection 64 of the cushioning member 60 can absorb variations in the position and shape of the fitted portion 50 of the underframe portion 36.

[0055] Furthermore, according to the second embodiment, the multiple protrusions 64C formed on the outer circumference of the projection 64 shown in Figure 7 are arranged at intervals in the circumferential direction of the projection 64 and extend along the projection direction of the projection 64. Therefore, when the projection 64 is fitted into the mating portion 50 as shown in Figure 8, the multiple protrusions 64C are compressed and the projection 64 is press-fitted. As a result, the degree of fitting between the projection 64 and the mating portion 50 can be adjusted by the multiple protrusions 64C, making it easy to set the degree of fitting between the projection 64 and the mating portion 50 to a desirable state.

[0056] Furthermore, according to the second embodiment, in the cushioning member 60 shown in Figure 7, an annular projection 66 that protrudes in the same direction as the projection 64 along the entire circumference of the outer periphery of the surface 62A on which the projection 64 is formed is capable of contacting the upper surface 36A1 of the underframe portion 36 shown in Figure 8. As a result, when the cushioning member 60 comes into contact with the upper surface 36A1 of the underframe portion 36 when the seat cushion 12 (see Figure 1) is returned from a flipped-up position (for example, a tip-up position) to the seating position, the annular projection 66 first comes into contact with the upper surface 36A1 of the underframe portion 36 and undergoes elastic deformation. Therefore, the initial load when the cushioning member 60 comes into contact with the upper surface 36A1 of the underframe portion 36 can be controlled by the annular projection 66. The annular projection 66 of the cushioning member 60 also contributes to improving the vibration absorption performance when the occupant is seated.

[0057] [Supplementary explanation of the embodiment] In the first and second embodiments shown in Figures 1 to 8, the vehicle seat according to the present invention was described in the case where it is applied to a vehicle seat. However, the vehicle seat according to the present invention can also be applied to seats for vehicles other than vehicles (for example, aircraft and ships).

[0058] Furthermore, in the first and second embodiments described above, the seat cushion 12 is configured to be flipped up toward the rear of the seat, but the seat cushion may also be configured to be flipped up toward the front of the seat, or to be flipped up toward the side of the seat. To provide further explanation regarding a vehicle seat in which the seat cushion is configured to be flipped up toward the front of the seat, for example, if a vehicle seat as a vehicle seat is equipped with a double folding mechanism, it is possible to arrange the seat by flipping the seat cushion toward the front of the seat and then folding the seat back forward into the gap created.

[0059] Furthermore, in the first and second embodiments described above, the fitted portion 50 has a tapered surface 52 that decreases in diameter from the upper end opening 50A to the lower end opening 50B, and such a configuration is preferred. However, the fitted portion may also be configured such that it does not have a tapered surface (52) and the projections (44, 64) of the cushioning members (40, 60) elastically deform and fit into place.

[0060] Furthermore, in the first and second embodiments described above, the fitting portion 50 is formed by burring the top plate portion 36A of the underframe portion 36, and such a configuration is preferred. However, the fitting portion may also be configured so that the protrusions (44, 64) of the cushioning members (40, 60) elastically deform and fit together without burring.

[0061] Furthermore, in the first and second embodiments described above, the fitted portion 50 is formed in the shape of a hole, and such a configuration is preferred. However, the fitted portion may also be configured in a way that it is not formed in the shape of a hole, for example, by comprising a plurality of protrusions arranged at intervals on a predetermined circumference on the upper surface of the underframe portion, and when the seat back is in the seating position, the plurality of protrusions support the projection of the cushioning member from the outer circumference in a state in which it is compressed elastically deformed toward its central axis.

[0062] Furthermore, in the first and second embodiments described above, holes 44H and 64H are formed along the central axis of the projections 44 and 64 of the cushioning members 40 and 60, and this configuration is preferred. However, a configuration in which holes (44H and 64H) are not formed on the projections of the cushioning members is also possible.

[0063] Furthermore, in the first and second embodiments described above, when the projections 44 and 64 of the cushioning members 40 and 60 are fitted into the fitting portion 50, the lower end positions of the projections 44 and 64 are set to be located above the lower end opening 50B, which is the lower end of the tapered surface 52. While this setting is preferred, configurations other than this setting are also possible.

[0064] Furthermore, the sizes of the convex portion 64C and the annular projection portion 66 in the second embodiment are not limited to the sizes shown in Figures 7 and 8. Also, in the second embodiment, for example, the convex portion 64C is formed in a continuous manner with the surface 62A on which the projection portion 64 is formed in the cushioning member 60. However, as a modification of the second embodiment, the convex portion formed on the outer circumference of the projection portion (64) may be formed in a non-continuous manner with the surface (62A) on which the projection portion (64) is formed in the cushioning member (60).

[0065] Furthermore, the first and second embodiments described above, as well as the various modifications described above, can be combined and implemented as appropriate.

[0066] Although an example of the present invention has been described above, the present invention is not limited to the above, and it is of course possible to implement it in various ways without departing from its spirit. [Explanation of symbols]

[0067] 10 Vehicle seats 12 seat cushions 14 Seatback 36 Underframe section 36A1 Top surface of the underframe 40 Cushioning material 44 Protrusion 44H Hole 50 Fitting part 50A top opening 50B Bottom opening 52 Tapered surface 60 Cushioning material 62A Surface on which the protrusion is formed 64 Protrusion 64A Tapered section 64C protrusion 64H Hole 66 Annular projection

Claims

1. A seatback that supports the back of the seated occupant, A seat cushion that supports the buttocks and thighs of the seated occupant and can be flipped up, A cushioning member is attached to the lower surface of the seat cushion and has a projection that protrudes on the side opposite to the seat cushion, The underframe portion forms the lower frame portion of the seat cushion, and the protrusion portion is elastically deformed and fitted into a fitted portion formed therein, A vehicle seat equipped with [a specific feature / feature].

2. The seat for a vehicle according to claim 1, wherein the fitting portion is formed in the shape of a hole and has a tapered surface that decreases in diameter from the upper end opening to the lower end opening.

3. The vehicle seat according to claim 1, wherein the projection has a tapered portion that is tapered toward the protruding tip when not fitted into the fitting portion.

4. The vehicle seat according to claim 1, wherein a hole is formed in the projection along its central axis.

5. The vehicle seat according to claim 2, wherein, when the projection is fitted into the fitting portion, the lower end position of the projection is set to be located above the lower end opening, which is the lower end of the tapered surface.

6. The vehicle seat according to claim 1, wherein a plurality of protrusions are formed on the outer periphery of the projection, arranged at intervals in the circumferential direction of the projection and extending along the projection direction of the projection.

7. The cushioning member has an annular projection formed around the entire circumference of the outer periphery of the surface on which the projection is formed, which protrudes in the same direction as the projection and can contact the upper surface of the underframe portion, as described in any one of claims 1 to 6.

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