JP2012020083A - Cushion structure and seat structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushion structure preventing a lift and creases of the surface with simple constitution, securing the stroke quantity when a user is seated, and excelling in a vibration absorbing property.SOLUTION: The lift and creases of a covering member on the surface can be prevented while exhibiting a required stroke feeling and the vibration absorbing property in spite of the simple constitution because of the constitution of filling a base pad 40 with a cushion material in a compressed state. Since the base pad 40 has a projecting part 43, when the cushion structure is applied to a vehicle, transmission of vibration from a vehicle floor to the base pad 40 can be reduced. The material, thickness, area, etc. of the projecting part 43 are changed to adjust spring characteristics of the projection itself in various ways to thereby provide the stroke feeling and vibration absorbing property suitable for the vehicle equipped with this cushion structure.

Description

  The present invention relates to a cushion structure that is suitable for a vehicle seat such as an automobile, an aircraft, and a train, and that can be used for furniture, an office chair, and the like, and a seat structure including the cushion structure.

  In order to improve vibration absorption characteristics, shock absorption characteristics, etc., the present applicant arranges a torsion bar at the front edge of the seat cushion, and elastically supports the base cushion by this torsion bar, and three-dimensionally above it. Various seat structures having a cushion structure in which a three-dimensional knitted fabric, a urethane material, or the like is arranged have been proposed (see, for example, Patent Document 1).

WO2007 / 077699

  A conventional seat structure as disclosed in Patent Document 1 is simply shown as shown in FIG. That is, the front end edge 530a of the base net 530 is engaged with the support frame 520 spanned between the front ends of the arms 510 connected to the torsion bar 500, the rear end edge 530b is engaged with the rear portion 541 of the cushion frame 540, A cushion material 550 such as a three-dimensional solid knitted fabric or a bead foam is disposed thereon. As shown in FIG. 10 (a), when seated, the cushion material 550 and the base net 530 are displaced downward about the portion corresponding to the ischial nodule, but are relatively supported by the arm 510. The frame 520 rotates upward and presses the thigh from below. Further, when the seated person moves the center of gravity to the thigh due to a change in posture, the arm 510 and the support frame 520 rotate downward as shown in FIG.

  However, the base net 530 needs to be stretched with a predetermined tension because it is necessary to prevent the surface of the cushion material 550 from being lifted or wrinkled. Conventionally, since the front edge 530a of the base net 530 is connected to the support frame 520, the sense of stroke when seated on the cushion material 550 and the rotation angle of the arm 510 and the support frame 520 depend on the tension of the base net 520. However, since it is tensioned with a predetermined tension, as a result, when it feels that the stroke at the time of sitting is insufficient, or the displacement of the rotation angle of the arm 510 or the support frame 520 that is displaced by posture change, vibration, etc. There is room for improvement in terms of seating feeling, such as when there is a lack of quantity.

  The present invention has been made in view of the above, and while having a simpler structure than the conventional one, it is possible to prevent surface lifting and wrinkling, and to provide a cushion structure excellent in securing a stroke amount and satisfactorily absorbing vibration during sitting. The issue is to provide. Also, by applying this cushion structure, it is possible to improve the follow-up of the displacement of the rotation angle of the arm or the support frame due to posture change or vibration, and provide a seat structure that can further improve the seating feeling and the like. This is the issue.

  In order to solve the above problems, a cushion structure of the present invention is a cushion structure provided in a seat cushion portion, and includes a bottom wall portion and a peripheral wall portion that rises upward at at least a part of the peripheral edge portion of the bottom wall portion. A base pad having a projecting portion projecting downward on the back surface of the bottom wall portion, and a cushion material disposed in a compressed state inside the peripheral wall portion of the base pad. It is characterized by.

  It is preferable to further include a covering member that covers the upper surface of the cushion material, and the covering member presses the cushion material from the upper surface. The covering member is attached with its peripheral surface covering portion being bonded to the base pad, and by making the bonding range partially different in the peripheral surface covering portion, the tension of the covering member Is preferably adjusted. The base pad may be made of synthetic resin or wooden. The base pad is preferably formed from a bead foam. The projecting portion of the base pad may be formed separately from the bottom wall portion and then fixed to the bottom wall portion. In this case, it is preferable that the protrusion of the base pad is formed from a bead foam or a urethane foam material. It is preferable that the cushion material is a three-dimensional solid knitted fabric or a urethane foam material. The seat cushion portion further includes a base net that is spanned between a front frame and a rear frame that are provided at a predetermined interval in the front-rear direction, the base pad, and the protruding portion that projects the base net from the upper surface. It is preferable to be provided at a position where pressing is possible.

  The seat structure of the present invention is a seat structure comprising a seat cushion portion and a seat back portion, wherein any one of the above cushion structures is disposed on the seat cushion portion. The front edge of the seat cushion is provided with a pair of arms that can be pivoted up and down around the base, and is placed between the tips of the arms and elastically supports the thigh from below Preferably, a thigh support mechanism including a thigh support frame is provided, and a front edge portion of the base pad is elastically supported by the thigh support frame. It is preferable that the thigh support mechanism is elastically supported by a torsion bar disposed between the base end portions of the arm portions.

  The cushion structure of the present invention has a configuration in which a cushion material is loaded into a base pad in a compressed state, so that it can exhibit a necessary stroke feeling and vibration absorption characteristics while having a simple configuration, and the surface covering member can be lifted. Wrinkles can be prevented. Since the base pad has the protruding portion, when applied to a vehicle, it is possible to reduce the vibration from the vehicle floor transmitted to the base pad. In addition, by adjusting the spring characteristics of the protrusion itself by changing the material, thickness, area, etc. of the protrusion, it is possible to provide a stroke feeling and vibration absorption characteristics suitable for a vehicle equipped with this cushion structure. it can.

  In addition, in the seat structure to which this cushion structure is applied, the front part of the base net of the seat cushion part is not engaged with the thigh support frame elastically provided at the front edge part, but the front part frame. And a base pad that supports a cushion material is engaged with the thigh support frame, and the base net is attached to the bottom wall portion of the base pad from the upper surface. It is preferable to have a configuration in which a pushable protrusion is provided.

  Since the base net is not engaged with the thigh support frame, the tension of the base net does not affect the surface of the seat cushion portion. Therefore, the base net can be provided with lower tension than before. For this reason, when a person is seated, the protruding portion of the base pad presses the base net, but the stroke amount at this time becomes larger than the conventional one. In addition, the base pad has a protrusion, and compared to the case without a protrusion, the rigidity in the thickness direction around the protrusion is higher in a wider range. Since the front edge portion including the protruding portion is also pressed downward, the thigh support frame is rotated downward. Therefore, the stroke at the time of sitting can be felt not only in the vicinity of the sciatic nodule but also in the thigh, and the feeling of bottoming at the time of sitting becomes smaller than before. In addition, since the stroke amount at the time of sitting is larger than the conventional one, when the force to rotate the thigh support frame downwards by extending or contracting the legs is applied, the rotation of the arm that supports the thigh support frame is performed. The responsiveness of the change of the moving angle is improved compared to the conventional one, the followability of the thigh support frame at the time of posture change, the followability of the thigh support frame at the time of vibration input is higher than before, and the seating feeling Can be improved.

FIG. 1 is a perspective view showing an appearance of a seat structure according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIGS. 3A and 3B are diagrams for explaining the operation of the base net, the base pad, and the thigh support mechanism. FIG. 4 is a perspective view for explaining the structure of the base pad. FIGS. 5A and 5B are diagrams for explaining a process of assembling the cushion material and the covering member to the base pad. FIG. 5A shows the appearance of the seat cushion portion, and FIG. 5B shows the A line in FIG. (C) is sectional drawing which followed the B line of (a). 6 (a) to 6 (c) are diagrams for explaining a process of assembling the cushion material and the covering member to the base pad, (a) is the covering member, (b) is the cushioning material, ( c) shows a base pad, respectively. FIG. 7 is a cross-sectional view showing a seat cushion portion using a cushion material according to another aspect. FIG. 8 is a cross-sectional view showing a seat cushion portion using a cushion material and a covering member according to still another aspect. FIG. 9 is a cross-sectional view showing a schematic configuration of a seat cushion portion in a conventional seat structure. FIGS. 10A and 10B are views for explaining the operation of the conventional seat cushion portion.

  Hereinafter, the present invention will be described in more detail based on the embodiments of the present invention shown in the drawings. FIG. 1 is a perspective view showing a seat structure 1 used as a vehicle seat according to an embodiment of the present invention. In the seat cushion portion 10 of the seat structure 1, a cushion structure including a base net 30, a base pad 40, a cushion material 50, and the like is disposed on a cushion frame 20.

  As shown in FIG. 2, the cushion frame 20 includes a front frame 21, a rear frame 22 disposed at a predetermined interval with respect to the front frame 21, and each side portion of the front frame 21 and the rear frame 22. It has the side frame 23 arrange | positioned at.

  A thigh support mechanism 200 is provided at the front edge of the cushion frame 20. The thigh support mechanism 200 includes a torsion bar 201 disposed along the width direction in front of the front frame 21. For example, the torsion bar 201 is stretched between brackets provided at a predetermined interval in the width direction so as to protrude forward from the front frame 21. A base end portion 202a of a pair of arm portions 202 provided at a predetermined interval in the width direction is connected to the torsion bar 201, and the arm portion 202 can be turned up and down around the base end portion 202a. ing. A thigh support frame 203 is spanned between the distal end portions 202b of the arm portion 202. The thigh support frame 203 and the arm portion 202 can also be formed as a substantially U-shaped frame in which both are integrated.

  The base net 30 is arranged so as to be spanned between the front frame 21 and the rear frame 22. The thigh support frame 203 elastically supported by the torsion bar 201 supports the base pad 40 as will be described later, and the base net 30 is disposed below the base net 30, so that the tension is applied to the exterior of the seat surface. Has no effect. Accordingly, the base net 30 can be provided with a lower tension, which contributes to an increase in the stroke amount when seated. The base net 30 can be a two-dimensional net material or fabric, or a three-dimensional solid knitted fabric.

  As shown in FIGS. 2, 4, 5, and 6 (c), the base pad 40 is formed from the bottom wall 41 and at least a part of the peripheral edge of the bottom wall 41 in the present embodiment. It is formed in a concave cross section having a peripheral wall portion 42 that rises upward from both side edge portions and a rear edge portion, and has a protruding portion 43 that protrudes downward on the back surface of the bottom wall portion 41. The base pad 40 is disposed such that the front edge portion 44 covers the thigh support frame 203 from the upper side to the lower side. Thereby, the front edge 44 is elastically supported by the thigh support frame 203. The protrusion 43 is provided at a position where the base net 30 can be pressed from the upper surface. Specifically, it is provided at a position corresponding to the vicinity of the human sciatic nodule when seated. The shape of the protrusion 43 is not limited. For example, as shown in FIG. 4, two circular cross-sections are arranged on the left and right sides, or one of a substantially rectangular shape or a substantially elliptical shape is used. A plurality of them can be arranged. The number of arrangements can be appropriately adjusted according to the size of each protrusion 43. Depending on the shape and size of the protrusion 43, the pressing area of the base net 30 changes. For example, if the diameter is 30 mm, the spring constant obtained from the load-deflection characteristics when the base net 30 is pressed is low. If the diameter is 200 mm, the spring constant is high, and the diameter is 98 mm. If there is, the spring constant is about the middle of both. Thus, the desired spring characteristics can be set depending on the shape and size of the protrusion 43.

  The base pad 40 can be molded from a synthetic resin or wood, but since it is lightweight, a bead foam is preferred particularly when applied to a vehicle seat. As the bead foam, a foam molded body by a resin bead method including at least one of polystyrene, polypropylene, and polyethylene is used. The expansion ratio is arbitrary and is not limited. The base pad 40 has a high rigidity around the protrusion 43 in a portion where the protrusion 43 is formed. In furniture chairs and the like, it can also be formed from wood.

  According to the present embodiment, when a load is applied in the vicinity of the protrusion 43, as shown in FIG. 3A, the vicinity of the front edge 44 also moves downward as indicated by “a2” in the figure. . For this reason, the thigh support frame 203 is rotated downward by an angle corresponding to “a1” in the figure in accordance with the front edge portion 44. Thereby, compared with the past, a seated person can feel the stroke at the time of sitting large. Further, when the leg portion is expanded or contracted in the sitting state, the front edge portion 44 is further pressed downward as shown in FIG. Accordingly, the thigh support frame 203 further rotates downward by an angle corresponding to “b” in FIG. As described above, according to the present embodiment, a sufficient amount of displacement of the thigh support frame 203 according to posture change and input vibration can be secured, and riding comfort and vibration absorption characteristics can be improved.

  Next, the cushion material 50 will be described. The cushion material 50 is made of a three-dimensional solid knitted fabric, a urethane foam material, or a laminate thereof, and is disposed on the bottom wall portion 41 of the base pad 40. As described above, the base pad 40 is formed in a concave cross section having the peripheral wall portion 42 at the peripheral edge portion of the bottom wall portion 41, and the cushion material 50 is disposed on the inner side surrounded by the peripheral wall portion 42. At this time, in this embodiment, the thickness is wider than the inner width dimension of the bottom wall portion 41 surrounded by the peripheral wall portion 42, and is equal to or greater than the height of the peripheral wall portion 42 (depth of the base pad 40 having a concave cross section). The cushion material 50 which has is loaded. That is, while compressing the cushion material 50 to the left and right, the upper surface of the cushion material 50 is further covered with the covering member 51 and loaded so as to be pressed from the upper surface by the covering member 51 as shown in FIG.

  When the cushion material 50 is formed from, for example, a three-dimensional solid knitted fabric, the manufacturing cost increases as the pile density increases. In the case of this embodiment, the pile density is coarser than the originally desired density, and this is compressed and loaded as described above, whereby the pile density can be substantially increased and the cost is reduced. be able to. Moreover, by compressing and loading in this way, tension can be applied to the covering member 51, and wrinkling and floating of the covering member 51 can be prevented.

  Here, the covering member 51 is provided by joining the peripheral surface covering portion 51 a to the outer surface of the peripheral wall portion 42 of the base pad 40. In the present embodiment, as shown in FIG. 5, a hook-and-loop fastener 52 is provided between the peripheral surface covering portion 51 a and the outer surface of the peripheral wall portion 42 of the base pad 40 to join them together. A hook-and-loop fastener 52 is also provided between the peripheral surface covering portion 51a located on the front edge side of the covering member 51 and the front edge portion lower edge 45 of the base pad 40, and both are joined.

  At this time, it is preferable that the bonding range (bonding density) is partially different. For example, as shown in FIG. 6C, a range closer to the front edge than the substantially central portion in the depth direction along the side edge of the base pad 40 (range “A” in FIG. 6C) and the front edge In the range where the lower edge 45 is located (the range of “B” in FIG. 6C), between the peripheral surface covering portion 51 a and the outer surface of the peripheral wall portion 42, and between the peripheral surface covering portion 51 a and the front edge portion lower edge 45. Join most parts between. On the other hand, in the range closer to the rear edge than the substantially central portion in the depth direction along the side edge (the range of “C” in FIG. 6C), the two are joined only partially at regular intervals. In the range of the part (the range of “D” in FIG. 6C), most of both parts are joined. 6A shows the joining range in the peripheral surface covering portion 51a of the covering member 51, and the hatched portion in FIG. 6C indicates the outer surface of the peripheral wall portion 42 of the base pad 40 and below the front edge portion. The joining range at the edge 45 is shown. In this way, the tension of the covering member 51 can be easily adjusted by setting the “dense” and “sparse” parts in the joint range between the two and adjusting the setting range and the “sparse / dense” degree. can do. In the present embodiment, the surface fastener 52 is used for bonding, but as long as the peripheral surface covering portion 51a of the covering member 51 and the outer surface of the peripheral wall portion 42 of the base pad 40 or the front edge portion lower edge 45 can be connected, Other joining means such as adhesion can also be used.

  FIG. 7 shows another embodiment of the cushioning material 50. The three-dimensional solid knitted fabric is folded inward from both sides, and the folded pieces are faced to each other and stacked and stitched together to form a substantially three-dimensional solid knitted fabric. The first cushion material 501 having the four-layer structure and the second cushion material 502 having the same configuration are arranged adjacent to each other in the peripheral wall portion 42 of the base pad 40 and compressed by the covering member 51 in the same manner as described above. It is assembled. Thus, by providing the base pad 40 having a concave cross section, the seat structure 1 having various spring characteristics can be provided by appropriately selecting the cushion material 50 to be loaded.

  FIG. 8 shows an aspect in which an inner covering member 511 and an outer covering member 512 are provided as the covering member 51 while using the first cushion member 501 and the second cushion member 502 similar to those in FIG. 7. In this aspect, the outer appearance of the design can be adjusted by the outer covering member 512 by performing the function of compressing the first cushion material 501 and the second cushion material 502 by the inner covering member 511. Moreover, the spring characteristic of the seat cushion part 10 whole can also be adjusted by comprising the inner side covering member 511 and the outer side covering member 512 from a two-layered covering member like this aspect, respectively.

  In the above embodiment, the base net 30 is provided as a cushion structure. However, the base net 30 may not be provided in a rear seat or the like of an automobile. In that case, the protrusion 43 of the base pad 40 is provided on the floor. Since the protrusion 43 forms a gap between the floor surface and the bottom wall portion 41 of the base pad 40, the vibration of the floor surface is not directly transmitted to the bottom wall portion 41. Moreover, by selecting the material which comprises the protrusion part 43 suitably, for example, by making it a bead foam or a foaming urethane material, further changing those expansion ratios, or as mentioned above. By changing the size, shape, and height of the protrusion 43, the spring characteristics of the protrusion 43 itself can be selected as appropriate, and the stroke feeling and vibration absorption characteristics during sitting can be variously adjusted. In this case, the bottom wall portion 41 and the projecting portion 43 are not integrally molded, but may be configured to be fixed together after being molded separately. Thereby, for example, the bottom wall portion 41 is formed from a bead foam, and the protruding portion 43 is formed from a foamed urethane material, so that the spring characteristics can be adjusted.

  Moreover, when it is set as the structure which compresses and loads the cushioning material 50 to the base pad 40 like this embodiment, the tension | tensile_strength of a seat surface can be easily adjusted by adjusting the degree of compression. If the tension of the seating surface is adjusted, adjustment of the sitting stroke, sitting comfort, body pressure distribution, posture, especially seat angle will be adjusted, preventing hip slip and concentrating pressure on the tailbone. It is an effective way to avoid it. That is, according to this embodiment, it is possible to adjust to a desired riding comfort by adjusting the cushion characteristics by the protrusion 43 of the base pad 40 described above, and it is possible to adjust to a desired sitting comfort by adjusting the tension of the seating surface.

  Moreover, in the said embodiment, although the thigh support mechanism 200 is provided, it does not necessarily need to be provided with the vehicle and site | part to apply. By providing the thigh support mechanism 200 and the base net 30 described above, the support and followability of the posture are improved, the vibration absorption characteristics are improved, and the stroke feeling is improved as compared with the configuration not having them. Although there is an effect such as an increase, it is preferable to make various selections in consideration of the vehicle, part or cost to be applied.

DESCRIPTION OF SYMBOLS 1 Seat structure 10 Seat cushion part 20 Cushion frame 21 Front frame 22 Rear part frame 30 Base net 40 Base pad 41 Bottom wall part 42 Perimeter wall part 43 Protrusion part 44 Front edge part 45 Front edge part Lower edge 50 Cushion material 51 Covering member 200 Large Thigh support mechanism 201 Torsion bar 202 Arm part 203 Thigh support frame

Claims (12)

A cushion structure provided in the seat cushion portion,
A base pad having a bottom wall portion and a concave cross section having a peripheral wall portion rising upward at at least a part of a peripheral edge portion of the bottom wall portion, and having a protruding portion protruding downward on the back surface of the bottom wall portion When,
A cushion structure comprising a cushion material disposed in a compressed state inside a peripheral wall portion of the base pad.   The cushion structure according to claim 1, further comprising a covering member that covers an upper surface of the cushion material, wherein the covering member presses the cushion material from the upper surface.   The covering member is attached with its peripheral surface covering portion being bonded to the base pad, and by making the bonding range partially different in the peripheral surface covering portion, the tension of the covering member The cushion structure according to claim 1 or 2, wherein is adjusted.   The cushion structure according to any one of claims 1 to 3, wherein the base pad is made of synthetic resin or wood.   The cushion structure according to claim 4, wherein the base pad is formed of a bead foam.   The cushion structure according to any one of claims 1 to 5, wherein the protruding portion of the base pad is formed separately from the bottom wall portion and then fixed to the bottom wall portion.   The cushion structure according to claim 6, wherein the protruding portion of the base pad is formed of a bead foam or a foamed urethane material.   The cushion structure according to any one of claims 1 to 7, wherein the cushion material is a three-dimensional solid knitted fabric or a urethane foam material. The seat cushion portion further includes a base net that is spanned between a front frame and a rear frame that are provided at a predetermined interval in the front-rear direction,
The cushion structure according to any one of claims 1 to 8, wherein the base pad is provided at a position where the protruding portion can press the base net from an upper surface. A seat structure including a seat cushion portion and a seat back portion,
A seat structure in which the cushion structure according to any one of claims 1 to 9 is disposed on the seat cushion portion. The front edge of the seat cushion is provided with a pair of arms that can be pivoted up and down around the base, and is placed between the tips of the arms and elastically supports the thigh from below A thigh support mechanism with a thigh support frame to
The seat structure according to claim 10, wherein a front edge portion of the base pad is elastically supported by the thigh support frame.   The seat structure according to claim 11, wherein the thigh support mechanism is elastically supported by a torsion bar disposed between proximal ends of the arm portions.

Images