JP5020548B2 - Seat seat structure - Google Patents

Description

  The present invention relates to a seat structure for various seats.

For example, a urethane resin has been conventionally used for a seat portion (cushion) of a railroad seat. Since the urethane resin has a high degree of freedom to deform into a three-dimensional shape according to the body shape and load of the person who sits down, a preferable seating feeling can be obtained. However, since there is a problem that toxic gas is generated during recycling (incineration), recently, a laminate (molded article) of fiber materials that can be completely incinerated is being used as a seat seat (and a seat back).
Japanese Patent Laid-Open No. 11-42380

  However, a laminated product of fiber materials is difficult to be transformed into a three-dimensional shape when seated. For this reason, improvement of a seating feeling is calculated | required.

  SUMMARY OF THE INVENTION An object of the present invention is to obtain a seat structure that is excellent in a seating feeling, that is, a body shape and a followability to a load, in a sheet that forms a seat portion from a laminate of fiber materials.

In the seat structure of a seat in which a spring member is bridged between the front and rear frame members and the seat portion is placed on the spring member, the spring member is formed in an S shape in a plan view. In the state of being bent to the front and rear frame members, the center portion in the front-rear direction is high upward in the side view, while the seat seat portion is made of fiber. The material is formed by heat compression molding with a molding die , and its lower surface corresponds to the medium-high shape of the medium- high S spring member, and is in a free state before being placed on the medium-high S spring member. It is characterized in that a bottom concave portion having a high central portion in the direction is formed.
The medium-high S spring member and the seat portion are preferably brought into contact with each other at the center portion in the front-rear direction and separated from each other at the front-rear end portions.

  It is preferable to arrange three or more medium-high S spring members at intervals in the width direction of the sheet per sheet width for one person.

  The seat structure of the seat according to the present invention can be used for a single seat of a railway vehicle or an airplane. However, in a chaise longue type for a railway vehicle, the front and rear frame members and the seat seat are made of a long material.

  The medium-high S spring member is formed, for example, so that the side view curvature in the suspended state to the front and rear frame members is smaller than the side view curvature in the free state, and tensile force is applied to both ends thereof. It is preferable to attach to the front and rear frame members.

  A sheet seat made of a laminate of fiber materials can be composed of a composite of different sheet fiber materials in order to obtain partially different hardnesses.

  For example, the seat portion may be formed by stacking a plurality of nonwoven fabrics processed into a thin sheet.

  Specifically, the fiber of the seat seat portion can be composed of carbon fiber or polyester fiber.

  According to the seat structure of the seat of the present invention, an excellent seating feeling can be obtained by using a seat section made of a laminate of fiber materials.

  The illustrated embodiment shows an embodiment in which the present invention is applied to a chaise longue structure of a railway vehicle. In the railway vehicle, as shown in FIGS. 1 to 3, a front frame member (pipe material) 11 and a rear frame member which are positioned in the front-rear direction (vehicle width direction) of the seat and which are long in the left-right direction (vehicle longitudinal direction). (Pipe material) 12 is fixed. The front frame member 11 and the rear frame member 12 are spaced apart in the left-right direction (in this embodiment, four per seat width as shown in FIG. 3), and the front spring hook member 13 and the rear spring hook The member 14 is fixed by welding. The front and rear spring hook members 13 and 14 have spring hook portions 13a and 14a facing each other at the rear end portion and the front end portion, respectively.

  The upper surface of the front frame member 11 is processed into a flat surface 11a, and a pair of left and right spring hook members 15 and 16 (FIGS. 3 and 5) are fixed by welding on the flat surface 11a. Has been. The left and right spring hook members 15 and 16 have spring hook portions 15a and 16a facing each other at their inner ends.

  A front / rear middle high S spring member 21 is stretched between the front and rear spring hook members 13 and 14, and a front left / right front middle height between the left and right spring hook members 15 and 16 on the front frame member 11. An S spring member 22 is stretched. The front / rear direction middle / high S spring member 21 and the front middle / high S spring member 22 have the same basic shape, although the length and curvature are flexible. That is, both the medium and high S spring members 21 and 22 have a shape in which the spring wire is continuously bent in an S shape in plan view. The “S-shape” is known to those skilled in the art as a concept including an S-shape, a U-shape or a rectangular shape. The middle and high S spring members 21 and 22 have a middle and high shape in which the central portion is high upward. In other words, the front / rear direction middle / high S spring member 21 is higher in the center part in the front / rear direction in the side view of the seat, and the front middle / high S spring member 22 is higher in the center part in the left / right direction in the front view of the seat. The manufacturing method of such a medium-high S spring member is well known to those skilled in the art.

  The front-rear direction middle-high S spring member 21 is hooked to the front and rear spring hook members 13 and 14 by attaching guide pieces 23 to the linear portions 21a at both ends thereof. At this time, the front / rear direction middle / high S spring member 21 has a smaller (larger) side view curvature (curvature radius) in the mounted (crossover) state than a side view curvature (curvature radius) in the free state at the end of quenching. (See FIG. 4). That is, the front / rear direction middle-high S spring member 21 is stretched by applying a tensile force to both ends, and in this state, the linear portions 21a (guide pieces 23) at both ends are hooked with the hook portions 13a of the front spring hook members 13 and the rear springs. The hook 14a of the member 14 is hooked.

  Similarly, the front middle-high S spring member 22 is hooked to the left and right spring hook members 15 and 16 by attaching guide pieces 24 to the linear portions 22a at both ends thereof. At this time, the front middle high S spring member 22 is extended by applying a tensile force to both ends, and in this state, the linear portions 22a (guide pieces 24) at both ends are hooked to the hook portions 15a and 16a of the left and right spring hook members 15 and 16. The front view curvature (curvature radius) in the mounted (overhead) state is smaller (larger) than the front view curvature (curvature radius) in the free state (see FIGS. 3 and 5). ). As described above, when a tension force is applied to the front / rear direction middle / high S spring member 21 and the front middle / high S spring member 22, the S spring members 21 and 22 are unlikely to come off, and a stable initial reaction force can be obtained. In FIG. 5, the middle / high amount of the front middle / high S spring member 22 is exaggerated.

  One of the points of the present embodiment is the middle shape in the side view of the middle-high S spring member 21 in the front-rear direction. When the medium height is assumed to be a flat medium-length S spring member 21 in the front-rear direction (21H line in FIG. 4), the maximum height H is about 10 to 30 mm. Although depending on the nature of the seat portion 30 made of a laminated product of fiber materials placed on the middle-high S spring member 21 in the front-rear direction, an appropriate soft seating feeling can be obtained when the height H is less than 10 mm. On the contrary, if it exceeds 30 mm, the seating feeling becomes too soft and gives an unstable feeling.

  As shown in FIGS. 1, 2, and 9, the seat seat portion 30 is formed with a lower surface recess 31 having a curvature corresponding to the middle-high shape (curvature) of the middle / high S spring member 21 in the front-rear direction. The lower surface recess 31 has a smooth medium-high shape that makes surface contact with the curved surface as much as possible when the front-rear direction middle-high S spring member 21 is assumed to be a curved surface. The thickness is the thinnest in any part of the lower surface recess 31.

  FIGS. 9 and 10 schematically show an example of a laminated structure of the seat seat 30. The seat portion 30 includes an intermediate layer 30A, a skin layer 30B, and an additional layer 30C. The intermediate layer 30A is a layer for providing an intermediate relatively soft softness, the skin layer 30B is a layer for providing a firm hardness of the surface layer, and the additional layer 30C is partially thickened. It is a layer for. These are manufactured by using predetermined fibers (types and wire diameters) as a non-woven sheet in a predetermined thickness, a predetermined density, and a predetermined shape, and are stacked in a predetermined position and placed in a mold, and are heated and compressed. The intermediate layer 30A, the skin layer 30B, and the additional layer 30C can use different fibers, but the hardness can be changed by changing the density of the same material (fiber). Various structures and manufacturing methods of the seat portion of such a laminated structure of fiber materials are known, and the above is an example.

  In addition to the above-described lower surface recess 31, a pair of left and right leg portions 32 protrude from the seat seat portion 30 at the front lower portion corresponding to the front middle / high S spring member 22 (FIGS. 5 and 8). In FIG. 8, three pairs of seats 30 for three persons are provided with a pair of legs 32 corresponding to each of the seats 30, and a front middle height S between each pair of legs 32. The embodiment in which the spring member 22 is located is depicted. The leg portions 32 that make a pair for each seat seat portion 30 form a left-right gap 35 between the left and right sides of the front middle-high S spring member 22 and the lower surface of the seat seat portion 30 in a non-sitting state on the seat seat portion 30. The center portion (the highest portion) of the front middle / high S spring member 22 abuts on the center of the lower surface of the seat seat portion 30. Each leg portion 32 is formed by laminating fibers that are harder than the other portion (seat seat portion 30) and hard to be compressed, and is in front from the contact portion with the flat surface 11a of the front frame member 11 toward the seat seat portion side. It has an unequal width shape (trapezoidal shape) that gradually widens the visual range and gradually narrows the distance between the paired leg portions.

  Further, a front-rear gap 36 (see FIGS. 1, 2, and FIG. 2) between the rear of the front middle / high S spring member 22 and the lower surface of the seat seat 30 that facilitates the sinking of the seat seat 30 downward. 6, FIG. 7) is also formed. The front center of the seat portion 30 abuts against the center of the medium-high S spring member 22 in a non-sitting state (the S spring member 22 is compressed by the seat portion 30). Moreover, although the unevenness | corrugation 37 for improving a seating feeling is formed in the seat surface of the seat seat part 30, the presence or absence, this shape, a magnitude | size, etc. of this seating surface unevenness | corrugation 37 can be set arbitrarily.

  In the seat structure of the seat having the above-described configuration, the medium-high S spring member 21 maintains the medium-high shape before a person sits on the seat seat 30 (FIG. 1). In this state, when a person is seated, as shown in FIG. 2, the medium-high S spring member 21 is elastically deformed so that the central portion is lowered. In the process of this elastic deformation, first, the medium-high S spring member 21 is deformed so that the length in a side view is shortened (that is, the interval between adjacent spring wires of the S spring member 21 is narrowed) to be in a planar state. After elastically deforming, it is deformed so that the same length becomes longer (so that the interval between adjacent spring wires becomes wider). For this reason, the stroke of the up-down direction of the seat seat part 30 can be enlarged, and a soft seating feeling can be obtained also in the seat seat part 30 which consists of a laminated molded product of a fiber material. Of course, the elasticity of the medium-high S spring member 21 is determined so as to obtain the above action.

  In addition, when a human load is applied, the seat seat portion 30 made of a laminate of fiber materials is less likely to expand and contract in the direction perpendicular to the load (extension direction of the fiber material) and is generally hard to the seated person. Make an impression. However, as in the embodiment, the S-spring member 21 is formed into a medium-high shape, and the lower surface recess 31 having a curvature corresponding to the curvature of the medium-high S spring member 21 is formed on the lower surface of the seat seat portion 30. The seat seat 30 can be made to follow the deformation of the spring member 21 well while maintaining the entire contact between the lower surface recess 21 and the lower surface recess 31, and a soft seating feeling can be given.

  Further, the front middle / high S spring member 22 can obtain the softness of the front (back of the knee) of the seat portion 30. That is, in the non-sitting state, as shown in an exaggerated manner in FIGS. 1 and 5, a sufficient gap is provided between the lower surface of the seat seat 30 and the flat surface 11 a of the front frame member 11 by the middle and high S spring members 22. 35 exists. When seated in this state, the seat seat portion 30 is pushed downward by the seated person's knees, and the middle and high S spring members 22 are elastically deformed in a plane to provide a soft seating feeling on the knees.

  Moreover, since the center part (highest part) of the front middle high S spring member 22 contacts the lower surface of the seat seat part 30, the seat seat part 30 receives the largest reaction force at the center part. On the other hand, since the gaps 35 are formed on the left and right, the left and right sides of the seat seat 30 are initially subjected to a small reaction force that only sinks (deforms) only the seat seat 30 and eventually the seat seat. When the lower surface 30 and the front middle high S spring member 22 abut, a large reaction force is received. For this reason, the moderate hardness of a center part and the softness of right and left can be obtained. Moreover, the leg part 32 which expands the width | variety of a front view so that it is upward suppresses the inclination of the seat seat part 30. FIG.

  The mode of elastic deformation of the medium-high S spring member 22 also changes depending on the posture of the seated person. FIG. 6 shows a case where a person with a long knee length is seated, and a load is applied to the back side of the seat seat 30, so that the front of the seat seat 30 is kept high. On the other hand, when the seated person throws his / her foot out, a load is also applied in front of the seat seat portion 30, so that the entire medium / high S spring member 22 is elastically deformed and the entire front portion of the seat seat portion 30 is displaced downward. .

  Important elements for obtaining such softness of the knee back are the elasticity of the medium-high S spring member 22, the medium-high S spring member 22 (the front lower surface of the seat seat 30), and the front frame member 11 (plane 11a). It is the clearance gap S (FIG. 5) in the free state between. The size of the gap S is preferably about 10 to 40 mm. If it is less than 10 mm, it is difficult to obtain a sufficiently soft seating feeling. If it exceeds 40 mm, the seat seat 30 will sink unnaturally, and the seating feeling will become unstable.

  The front middle and high S spring member 22 is preferably provided, but a soft seating feeling can be obtained even with only the front and rear direction middle and high S spring member 21 or the hard seat portion 30 made of a laminated product of fiber materials.

In the above embodiment, the present invention is applied to a chaise longue of a railway vehicle. However, the present invention is also applicable to an individual chair of a railway vehicle or an airplane.

It is a side view of the non-sitting state which shows one Embodiment of the seat part structure of the sheet | seat by this invention. It is a side view of the sitting state. FIG. 3 is a perspective view illustrating an embodiment in which a seat structure of a seat according to the present invention is applied to a chaise longue of a railway vehicle, mainly depicting medium and high S spring members excluding the seat seat. It is the top view and side view which show the tension | pulling step of the medium-high S spring member of FIG. It is sectional drawing which follows the VV line of FIG. It is sectional drawing of the seating state in alignment with the VI-VI line of FIG. It is sectional drawing which shows the same seating state. It is sectional drawing of the triple sheet | seat corresponding to FIG. FIG. 11 is a schematic cross-sectional view taken along the line IX-IX in FIG. 10 illustrating a structure example of the seat seat portion. FIG. 10 is a schematic cross-sectional view taken along the line XX of FIG. 9 showing a structural example of the seat seat portion.

Explanation of symbols

11 Front frame member 11a Flat surface 12 Rear frame member 13 14 15 16 Spring hook member 21 Front / rear direction middle / high S spring member 22 Front (left / right direction) middle / high S spring member 23 24 Guide piece 30 Seat seat portion 30A Intermediate layer 30B Skin layer 30C Layer 31 Lower surface concave portion 32 Leg portion 35 36 Gap 37 Seat surface unevenness

Claims (5)

In the seat structure of the seat where the spring member is bridged between the front and rear frame members and the seat portion is placed on the spring member,
The spring member has a shape in which a spring wire is continuously bent in an S shape in a plan view, and has a middle height S that is high in the center in the front-rear direction in a side view when it is suspended to the front and rear frame members. Consisting of spring members,
The seat seat is configured by heat compression molding a laminated product of fiber materials with a molding die , and is placed on the medium-high S spring member corresponding to the medium-high shape of the medium- high S spring member on the lower surface thereof. A seat seat structure in which a lower surface concave portion having a high central portion in the front-rear direction is formed in a free state prior to running. The seat structure of a seat according to claim 1, wherein the medium-high S spring member and the seat portion are in contact with each other at a central portion in the front-rear direction and are separated from each other at front and rear ends. The seat structure of the seat according to claim 1 or 2, wherein the medium-high S spring member has a smaller side view curvature in the suspended state to the front and rear frame members than the side view curvature in the free state. A seat structure for a seat to be attached to the front and rear frame members by applying a tensile force to both ends. The seat structure of the seat according to claim 1 or 3, wherein the seat section is formed by stacking a plurality of non-woven fabrics processed into a thin sheet. The seat structure of the seat according to any one of claims 1 to 4, wherein the fibers of the seat seat are made of carbon fiber or polyester fiber.

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