JP2013001293A - Seat structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat structure that is lightweight and can further contribute to increase fuel efficiency, energy conservation etc., of a vehicle.SOLUTION: A planar support member 150 supported on a cushion frame 100 is affixed to an anterior frame 110 with an anterior elastic support member 160 therebetween, and the anterior elastic support member is affixed with a hook-and-loop fastener 170 therebetween. It is possible to elastically support the planar support member 150 and a base net 300 by means of the elasticity in the planar direction of the hook-and-loop fastener 170 and the elasticity of the anterior elastic support member 160, and thereby, a torsion bar or an arm is not necessary and it is possible to achieve a simpler structure that is lightweight.

Description

  The present invention relates to a seat structure suitable for a vehicle seat such as an automobile, an aircraft, and a train.

  In order to improve vibration absorption characteristics, shock absorption characteristics, etc., the present applicant arranges a torsion bar at the front part of the seat cushion part, 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.

  The above-described seat structure uses the elasticity of the torsion bar 500, so that a desired stroke can be obtained with a relatively thin cushion material 550 such as a three-dimensional solid knitted fabric, and a desired vibration absorption characteristic can be obtained. For this reason, a lightweight seat structure can be obtained as compared with a type in which a urethane material having a predetermined thickness that is employed in a conventional general seat structure is laminated on a cushion pan or a back pan. However, in the vehicle seat, further weight reduction is demanded from the viewpoint of improving the fuel efficiency of the vehicle and saving energy.

  The present invention has been made in view of the above, and it is an object of the present invention to provide a seat structure that can further reduce the weight and further contribute to the improvement of fuel consumption and energy saving of vehicles.

  In order to solve the above problems, a seat structure of the present invention is a seat structure including a cushion frame and a back frame, and the cushion frame is provided with a front frame and a rear frame provided at predetermined intervals in the front-rear direction. A planar support member supported between a front frame and a rear frame of the cushion frame, a front portion supported by a front portion of the planar support member, and an upper portion at an upper portion of the back frame. It is supported and arranged between the base net for the cushion and the base net for the back, and the planar support member and the front frame of the cushion frame, and is displaced in the compression direction. A front elastic support member that is displaceable in a forward / backward swing direction and the front elastic support member A hook-and-loop fastener that is fixed to the front frame, and the elasticity of the front elastic support member and the elasticity of the surface fastener in the surface direction are used for elastic support of the planar support member and the base net. It is characterized by.

  It is preferable that the front portion of the base net is formed in a bag shape, and the bag-shaped portion is disposed so as to cover the front portion of the front surface support member. It is preferable that both are disposed via a hook-and-loop fastener in a state where the bag-shaped portion of the base net portion for cushion covers the front portion of the front surface support member. It is preferable that at least an upper portion of the base net is formed in a bag shape, and a portion formed in the bag shape is disposed so as to cover at least the upper portion of the back frame. The damping ratio when the base net is stretched on the measuring jig is 0.15 or less, and the damping ratio of the portion supporting the vicinity of the center of gravity of the seated person when stretched on the cushion frame and the back frame is 0. It is preferable that it is 1-0.15. The front elastic support member has a three-dimensional solid knitted fabric having a predetermined thickness, and preferably has a structure in which elasticity in the thickness direction and elasticity in the swinging direction to the front and rear act. The support member preferably further includes a foamed resin elastic member interposed between the three-dimensional solid knitted fabric and the front frame. It is preferable to further have a rear elastic support member disposed between the planar support member and the rear frame of the cushion frame. The rear elastic support member preferably includes a three-dimensional solid knitted fabric having a predetermined thickness. The planar support member is preferably formed having a foamed resin elastic member having a predetermined thickness. The planar support member is formed to have a curved cross-section with a concave central part, and a gap is formed between the base net and the planar support member when no load is applied. preferable.

  In the seat structure of the present invention, the planar support member supported by the cushion frame is fixed to the front frame via a front elastic support member, and the front elastic support member is fixed via a surface fastener. Accordingly, the elasticity of the planar support member and the base net itself functions, and the planar support member and the base net are elastically supported by the elasticity of the front elastic support member and the elasticity of the surface fastener in the surface direction. The torsion bar and arm are not required, the structure is simplified, and the weight can be reduced. In addition, since the base net integrally covers the cushion frame and the back frame and is suspended from the back frame, predetermined elasticity functions in the vicinity of the rear portion of the seat cushion portion also by this configuration. Therefore, there is no need for a metal spring or the like that supplements the elasticity in the vicinity of the rear portion of the seat cushion portion, which also contributes to weight reduction. Further, it is preferable that the front portion of the base net is formed in a bag shape, and the front portion of the planar support member is covered and disposed with the portion formed in the bag shape. It is more preferable that the back frame is disposed so as to cover at least the upper portion of the back frame with the bag-shaped portion. In this way, by forming a bag-like portion that engages with the planar support member and the back frame, it is elastic not only in one direction but also in the other direction near the bag-shaped portion of the base net. Can function to create soft spring characteristics. Moreover, weight reduction can be achieved by using a foamed resin elastic member as the planar support member. In addition, a gap formed between the base net and the planar support member when no load is applied by using a curved section having a concave central portion, and this gap becomes a stroke. In obtaining a predetermined stroke, a thinner support member can be used.

FIG. 1 is a perspective view showing an appearance of a seat structure according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of FIG. FIG. 3 is a view taken along line AA in FIG. FIG. 4 is a view taken along line AA in FIG. 1 for explaining the operation of the seat structure of the embodiment. FIG. 5 is a view showing an aspect in which the planar support member is not connected to the rear elastic support member. FIG. 6 is a perspective view showing an appearance of a seat structure according to another embodiment of the present invention. FIG. 7A is a view taken along line AA in FIG. 6, FIG. 7B is an external view of the vicinity of a portion C in FIGS. 6 and 7A, and FIG. FIG. 6 and FIG. 7 (a) are views excluding the epidermis in the vicinity of part C, and FIG. 7 (d) is a view taken along the line BB in FIG. 7 (c). FIG. 8 is an example showing a damping ratio of a portion corresponding to a waist portion of a sheet using a three-dimensional solid knitted fabric as a base net and a sheet using a urethane material. 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 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. As shown in these drawings, the seat structure 1 includes a seat cushion portion 10 and a seat back portion 20, the seat cushion portion 10 includes a cushion frame 100, and the seat back portion 20 includes a back frame 200. Yes.

  The seat structure 1 of the present embodiment is used particularly as an aircraft cabin seat, and has a passage side seat 1a and a window side seat 1b. The cushion frame 100 is supported by the leg 1c fixed to the floor and is disposed at a predetermined height from the floor. The cushion frame 100 includes a front frame 110 and a rear frame 120 disposed at a predetermined interval with respect to the front frame 110, and side frames are provided on both sides of the front frame 110 and the rear frame 120. 130 is passed. In addition, although the front frame 110 and the rear frame 120 are common frames in the aisle side seat 1a and the window side seat 1b in the present embodiment, they may be composed of separate frames.

  A planar support member 150 is supported on the cushion frame 110. The planar support member 150 has a foamed resin elastic member having a predetermined thickness. The foamed resin elastic member is preferably formed from a bead foam. 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 planar support member 150 may be composed only of a foamed resin elastic member, but the outer surface is preferably covered with, for example, a flame retardant fabric.

  The planar support member 150 is formed in a substantially square shape in a plan view, and is disposed so as to be spanned between the front frame 110 and the rear frame 120 of the cushion frame 100, and each side portion has a side frame 130. Supported by As shown in the sectional view of FIG. 3, the planar support member 150 has a concave portion 151 a formed along the width direction on the bottom surface near the front portion 151, and the concave portion 151 a is formed in the front frame. 110 is set to be located on the top. A front elastic support member 160 is interposed between the concave portion 151 a and the front frame 110.

  In this embodiment, the front elastic support member 160 is configured by laminating a three-dimensional solid knitted fabric 161 having a predetermined thickness and a foamed resin elastic member 162. The three-dimensional solid knitted fabric 161 is formed from a pair of ground knitted fabrics spaced apart by a predetermined distance and a connecting yarn that connects the pair of ground knitted fabrics. The material or the thickness of the ground knitted fabric and the connecting yarn is not limited as long as desired elasticity can be caused to function by compression and swing displacement. In the present embodiment, in order to obtain a desired elasticity, one three-dimensional solid knitted fabric 161 is folded in half and the outer surface is covered with the cloth material 161a. Of course, it may be a laminate of a plurality of three-dimensional knitted fabrics instead of being folded in two.

  The foamed resin elastic member 162 constituting the front elastic support member 160 is made of, for example, a bead foam like the planar support member 150, and is covered with a cloth material 162a. The three-dimensional three-dimensional knitted fabric 161 and the foamed resin elastic member 162 are integrated by sewing or the like, with the cloth materials 161a and 162a covering them.

  In the front elastic support member 160, the three-dimensional solid knitted fabric 161 is fixed to the concave portion 151 a on the bottom surface of the planar support member 150 by sewing or the like, and the foamed resin elastic member 162 is fixed to the upper surface of the front frame 110. Specifically, the foamed resin elastic member 162 and the front frame 110 are fixed with a surface fastener 170 interposed therebetween. Since the hook-and-loop fastener 170 is connected by the engagement between the hook and the loop, the relative motion between the foamed resin elastic member 162 and the front frame 110 is caused by the elastic action along the surface direction due to the deflection of the hook and the loop. Is possible. Accordingly, the three-dimensional solid knitted fabric 161 of the front elastic support member 160 is displaced in the compressing direction, so that a feeling of stroke at the time of sitting is secured and the thigh is close to the front portion 151 of the planar support member 150. By pressing the portion, the three-dimensional three-dimensional knitted fabric 161 of the front elastic support member 160 is displaced so as to be squeezed forward, and the third order around the front frame 110 by the elasticity along the surface direction of the hook-and-loop fastener 170. The original three-dimensional knitted fabric 161 is displaced in a direction that falls forward. The front elastic support member 160 is displaced so as to swing forward while being compressed in this way, thereby ensuring a sense of stroke at the time of sitting and taking a vibration absorbing action. In particular, in the present embodiment, the front frame 110 has a substantially C-shaped cross section, and the surface on which the foamed resin elastic member 162 is laminated via the hook-and-loop fastener 170 has a circular arc shape. Is easy to rotate and swing back and forth.

  The planar support member 150 also has a downward projecting portion 152 a that projects downward toward the rear portion 152. Here, the rear frame 120 is formed in a substantially J-shaped cross section, and the rear portion 152 of the planar support member 150 is positioned above the upper side portion 120a corresponding to the upper horizontal line of the letter “J” and is The protruding portion 152a is supported on the upper surface of the lower arc portion 120b of the letter “J”. A rear elastic support member 180 is disposed between the downward projecting portion 152 a and the lower edge arc portion 120 b of the rear frame 120. In this embodiment, the rear elastic support member 180 is formed by folding a three-dimensional three-dimensional knitted fabric 181 in two with a cloth material 181a, and the cloth material 181a is covered with the downward projecting portion 152a and the lower edge arc portion 120b of the rear frame 120. Fixed by sewing or the like.

  The lower surfaces of both side portions of the planar support member 150 are fixed to the side frames 130 via surface fasteners (not shown). Therefore, when longitudinal vibration is applied, the elasticity that relatively displaces both side portions of the planar support member 150 and each side frame 130 acts in the surface direction of the surface fastener.

  The back frame 200 includes side frames 230 that extend upward with lower ends connected to the intersections between the rear portions of the side frames 130 and the rear frame 120 of the cushion frame 100, respectively, for the passage-side seat 1a and the window-side seat 1b. In preparation. And between the upper end part of a pair of side frame 230 in each of the channel | path side seat 1a and the window side seat 1b, the upper frame 210 with which a seated person's head contact | abuts is spanned. The upper frame 210 is preferably covered with a foamed resin elastic member, particularly a bead foam. When the head abuts, the feeling of hitting the head is reduced by the elasticity of the foamed resin elastic member and can be softly supported.

  A cushion base net portion 310 is disposed in the seat cushion portion 10, and a back base net portion 320 is disposed in the seat back portion 20. In the base net 300 of the present embodiment, a cushion base net portion 310 and a back base net portion 320 are integrally formed. Here, “integrally formed” means that the cushion base net portion 310 and the back base net portion 320 are made of a single base net material, or a plurality of base net portions. This means that both materials are integrated by sewing together at appropriate positions.

  The front part 311 of the base net part 310 for cushion is fixed to the front end face 151b of the front part 151 of the planar support member 150 via a locking member, in this embodiment via a hook-and-loop fastener 312 and the planar support is provided. It covers the surface of the member 150 and extends in the direction of the rear portion 152 of the planar support member 150. The back base net portion 320 continues from the rear position of the integrated cushion base net portion 310, covers the front side of the back frame 200, is hung around the upper frame 210, and supports the upper portion 321. The back side of the bag claim 200 is covered, and the back side end 322 is fixed to the back side of the rear frame 120 of the cushion frame 100 by sewing. In addition, the base net 300 is overlapped from the portion corresponding to the base net portion 310 for cushion to the range corresponding to the lumbar support of the base net portion 320 for the back, so that the stroke feeling at the time of sitting is enhanced. Yes. In addition, a portion of the back base net portion 320 in the vicinity of the upper portion 321 where the head comes into contact is also overlapped, and the stroke feeling at the time of head contact is enhanced.

  The base net 300 is preferably formed from a three-dimensional solid knitted fabric having a predetermined elasticity while being thin. However, a two-dimensional net material or a two-dimensional net material laminated with a thin urethane material can be used as long as it has a predetermined elasticity. In the base net 300, the front part 311 of the cushion base net part 310 is supported by the front part 151 of the planar support member 150, and the upper part 321 of the back base net part 320 is suspended from the upper frame 210 of the back frame 200. It is supported by. Accordingly, when the vicinity of the boundary 330 between the rear portion of the cushion base net portion 310 and the lower portion of the back base net portion 320 is displaced up and down and back and forth during a seating operation and vibration input, the cushion base net portion 310 extends and contracts in the front and rear direction. The back base net 320 is vertically expanded and contracted, and a predetermined elasticity is exerted by the expansion and contraction. The base net 300 is preferably a three-dimensional solid knitted fabric, a two-dimensional net material, or the like, preferably when the base net 300 is stretched on a measurement jig with an elongation rate of 0% and pressed with a compression plate having a diameter of 98 mm. It is desirable that the hysteresis loss of the static load characteristics is 50% or less, more preferably 30% or less. Further, the damping ratio when a weight of 6.7 kg is dropped on the base net 300 stretched on the measuring jig with an elongation of 0% is 0.5 or less, preferably 0.35 or less. However, it is more preferably 0.2 or less, and still more preferably 0.15 or less. Thereby, the base net 300 can exhibit a high restoring force, and the vibration absorbability and the shock absorbency can be further improved.

  Of the base net 300, at least the surface from the front portion 311 of the cushion base net portion 310 to the upper portion 321 of the back base net portion 320 is covered with a skin 400 made of leather, synthetic leather, fabric, or the like. .

  According to the present embodiment, when a person is seated, the planar support member 150 is displaced downward in the seat cushion portion 10 together with the outer skin 400 and the cushion base net portion 310 as shown by a two-dot chain line in FIG. Then, the three-dimensional solid knitted fabric 161 of the front elastic support member 160 is crushed. When the cushion base net portion 310 is displaced downward, the integrally formed back base net portion 320 extends downward. A stroke during the sitting operation is obtained by these spring actions. In particular, since the planar support member 150 is formed from a foamed resin elastic member such as a bead foam, the rigidity becomes high and the elasticity in the pulling direction of the base net 300, which is a tensile structure, is pulled out well. In addition, the elasticity of the base net 300 in the pulling direction can easily function even when the front elastic support member 160 is unstablely moved back and forth. When the planar support member 150 is a hard layer, the hard layer is elastic in the pulling direction of the base net 300, which is the tension structure that performs the above-described spring action, and the front elastic support member disposed below. It is supported by two spring layers with compression characteristics, and furthermore, a soft layer by the compression characteristics of the base net 300 and the skin 400 is supported on the upper surface of the hard layer, so that the stroke feeling is in a stable feeling of support. Can be played.

  Further, when the seated person extends the leg, the thigh presses the vicinity of the front portion 151 of the planar support member 150 downward. Then, the front elastic support member 160 that supports the planar support member 150 is rotationally displaced not only in the compression direction but also in the forward direction. Thereby, the elasticity of the three-dimensional solid knitted fabric 161 of the front elastic support member 160 acts, and the elasticity in the surface direction of the base net portion 310 for cushion and further the elasticity in the surface direction of the hook-and-loop fastener 170 also acts. Therefore, although it is a simple structure which does not use a metal spring, sufficient stroke feeling can be obtained even when the legs are extended.

  On the other hand, during the operation of the vehicle (during traveling), the vibration of the three-dimensional solid knitted fabric 161 of the front elastic support member 160 and the rear portion are resistant to vibration transmitted from the floor via the front frame 110 and the rear frame 120. Elasticity of the three-dimensional solid knitted fabric 181 of the elastic support member 180, expansion and contraction of the base net 300, elasticity of the surface fastener 170 supporting the front elastic support member 160 on the front frame 120, and planar support Elasticity or the like in the surface direction of the surface fastener that supports both side portions of the member 150 on the side frame 130 acts. Thereby, even if it is a simple and lightweight structure which does not employ | adopt a metal spring, a high vibration absorption characteristic can be achieved.

  As shown in FIG. 2, it is preferable that the planar support member 150 is formed to have a curved cross section in which the central portion 150 a is concave. Thereby, a gap is formed between the cushion base net portion 310 of the base net 300 and the central portion 150a of the planar support member 150 when no load is applied. Therefore, during the seating operation, until the gap disappears, that is, until the back surface of the cushion base net portion 310 abuts against the surface of the central portion 150a of the planar support member 150, the stroke feeling further acts. A higher stroke feeling can be obtained while the thickness is the same as when the support member 150 is formed on a flat surface.

  Further, as shown in FIG. 5, the downward projecting portion 152a of the planar support member 150 has a rear elastic support member 180 (in FIG. 5, an example in which a laminate of two three-dimensional solid knitted fabrics is shown). It can also be set as the structure only mounted, without integrating in. In this case, since the downward projecting portion 152a is not fixed when a force pressing the front portion 151 of the planar support member 150 downward is applied, such as when the seated person extends the leg portion, the planar shape is not fixed. There is an advantage that the support member 150 is easily tilted forward, the followability to the buttocks and the thighs is improved, and the fit is enhanced.

  6 and 7 are views showing a seat structure 1 according to another embodiment of the present invention. In this embodiment, it has the base net bag-shaped part 3110 which processed the front part of the base net part 310 for cushions into the bag shape. The base net bag-like portion 3110 folds the front portion of the cushion base net portion 310 from the upper side to the lower side so that the upper surface, the lower surface, and both side surfaces of the front portion 151 of the planar support member 150 can be wrapped. It is folded back to the rear side, and side cover portions 3110a are provided on both sides to form a bag. The means for providing the side covering portion 3110a and processing it into a bag shape is arbitrary. For example, means for making a gusset by sewing, pinching, or molding means can be used.

  When the base net bag-like portion 3110 is formed on the base net portion 310 for cushion, the seat cushion portion in the outer skin 400 so that the outer skin 400 covering the base net bag-like portion 3110 can also be covered. It is preferable to form a skin bag-like portion 4110 obtained by processing 10 front portions into a bag shape. As with the base net bag-like portion 3110, the skin bag-like portion 4110 is also formed by folding the front part from the upper side to the lower side and then folding it back to the rear side to provide side cover parts 4110a on both sides by gusset stitching, knob stitching, etc. It is formed. At this time, the end of the outer bag part 4110 is more end than the end line (the C line in FIG. 7) of the base net bag part 3110 so that the outer base bag part 3110 is hidden by the outer bag part 4110 in appearance. It is preferable that the edge line (B line in FIG. 7) is formed on the rear side.

  In this way, the base net bag-like portion 3110 is formed, and the upper surface, the lower surface, and both side surfaces of the front portion 151 of the planar support member 150 are wrapped. Elasticity acts not only in the width direction but also in the thickness direction of the planar support member 150, softening the spring characteristics of the base net portion 310 for cushioning, and further improving the followability to the movement of the seated person and vibration absorption Can be planned. Moreover, it is preferable that the base net bag-like part 3110 is fixed between the front part 151 of the planar support member 150 via the hook-and-loop fastener 190. Thereby, the elasticity of the surface direction of this hook-and-loop fastener 190 also acts in a series arrangement.

  As in the above embodiment, the base net 300 can be a three-dimensional solid knitted fabric, a two-dimensional net material, a two-dimensional net material laminated with a thin urethane material, or the like, and has a hysteresis loss of 50 as described above. % Or less, preferably 30% or less. In addition, a material having an attenuation ratio of 0.5 or less, preferably 0.35 or less can be used, but it is more preferable to use a material having a damping ratio of 0.2 or less, more preferably 0.15 or less. After using such a base net 300, the base net bag-shaped portion 3110 is formed as described above, and the back base net portion 320 is formed in a bag shape so as to cover at least the upper portion of the back frame 200. In the base net 300, the portion supporting the vicinity of the center of gravity of the seated person, that is, the rear portion of the cushion base net portion 310 and the lower portion of the back base net portion 320 (lumbar / pelvis support portion). Can be set to a desired value. For example, assuming that an attenuation ratio of 0.15 or less, preferably 0.1 to 0.15, is used for the cushion frame 100 and the back frame 200 when measured by being stretched on a measurement jig. If the base net bag-like portion 3110 is formed as in the present embodiment, and the upper portion of the back base net 320 is also bag-like, as shown in this embodiment, the portion that supports the vicinity of the center of gravity of the seated person is attenuated. Becomes 0.1 to 0.15. This is because the base net bag-like portion 3110 and the bag-like portion at the top of the bag-like base net 320 formed in the bag shape have a high restoring force, and the elasticity in the surface direction of the hook-and-loop fastener 190 also acts. Yes, high restoring force can be obtained even near the center of gravity. Thereby, the followability to the movement of the seated person, the resilience of the shape when leaving the seat, and the sense of stroke when sitting can be further enhanced.

  Here, FIG. 8 is a diagram showing an attenuation ratio in the vicinity of the waist portion of the seat back portion. “Development Seat” is a three-dimensional knitted fabric that is formed into a bag shape and stretched around the back frame. The lower end is turned into a rigid bead foam, and a 3.2 mm diameter S spring is attached to the back frame. This is a structure in which a bead foam is supported by an S spring. In order to lower the surface pressure between the S spring and the bead foam, a synthetic resin support plate is set on the S spring. In the present embodiment, a hook-and-loop fastener and a front elastic support member are provided in place of the S spring, and the other frame constituting the seat is attached to one tension structure (a cushion frame if it is a back frame, a cushion). In the case of a frame, it is a back frame) and is given a restoring force from the other tension structure stretched on the back frame. “Conventional Seat” is a sheet in which urethane is laminated on a wire supported by a back frame. From this figure, while the damping ratio of “Conventional Seat” is about 0.2, the three-dimensional knitted fabric is formed into a bag shape, and the tension structure supported by the hook-and-loop fastener and the other frame. It was found that the damping ratio can be set to about 0.15 by supporting the elastic support member. According to the present embodiment, a damping ratio of about 0.15 can be achieved with the configuration of the hook-and-loop fastener, the tension structure, the front elastic member, etc. of the present embodiment that performs the same function as the S spring of “Development Seat”. A spring feeling equivalent to or higher than “Development Seat” can be obtained, and the weight can be reduced because a metal spring is not used. In addition, as in “Conventional Seat”, instead of supporting urethane on the wire, the back frame is provided with three S springs, and in the case of a conventionally used seat that supports urethane on the S spring, pad support Since the rigidity of the member is secured by the S spring, the rigidity of the pad support portion is lowered, and the damping ratio in the vicinity of the waist portion of the seat back portion is increased to about 0.3. In other words, the above facts suggested that the stiffness of the hard layer, which is a component of the cushion material, the hard layer, and the spring layer, has a great influence on the damping ratio created by the spring layer. Indicates.

  In the embodiment shown in FIGS. 6 and 7, the front elastic member 160 is made of a three-dimensional three-dimensional knitted fabric 161 folded in half, and the foaming used in the above embodiment with the front frame 110 is used. The resin elastic member 162 is attached to the front frame 110 via the hook-and-loop fastener 170 without being laminated. Since the foamed resin elastic member 162 is not laminated, the elasticity corresponding thereto does not act, but the elasticity in the surface direction of the hook-and-loop fastener 170 and the elasticity in the rotational and swinging direction of the bi-fold three-dimensional solid knitted fabric 161 act, and the required performance. It is possible to adopt such a configuration according to the above.

  Further, in each of the embodiments described above, the back base net portion 320 is disposed so that the upper portion 321 is supported by the upper frame 210 of the back frame 200 and covers the back side of the bag claim 200. That is, the back base net part 320 is formed in a bag shape that covers the entire back frame 200 (a range including the upper frame 210 to the lower part of the side frame 230). As a result, the back base net 320 has a spring characteristic in the front and back directions of the back frame 200 in addition to the surface direction (vertical direction and width direction), and is capable of following the movement of the seated person and vibration absorbing. Although contributing to the improvement, it is also possible to form a bag shape from the upper frame 210 of the back frame 200 to the middle part of the side frame 230 (preferably about the range corresponding to the chest corresponding to the seated person). As a result, the support pressure on the back of the seated person changes with the vicinity of the chest as a boundary, and a structure in which a folded posture can be easily formed can be achieved.

DESCRIPTION OF SYMBOLS 1 Seat structure 10 Seat cushion part 20 Seat back part 100 Cushion frame 110 Front frame 120 Rear frame 130 Side frame 150 Planar support member 160 Front elastic support member 170 Surface fastener 180 Rear elastic support member 200 Back frame 210 Upper frame 230 Side frame 300 Base net 310 Base net portion for cushion 3110 Base net bag-shaped portion 320 Base net portion for back 400 Skin 4110 Skin bag-shaped portion

Claims (11)

A seat structure comprising a cushion frame and a back frame,
The cushion frame has a front frame and a rear frame provided at predetermined intervals in the front-rear direction,
A planar support member supported between a front frame and a rear frame of the cushion frame;
A front net is supported by the front part of the planar support member, an upper part is supported by the upper part of the back frame, and a base net part for cushioning and a base net part for back are integrated, and
A front elastic support member that is disposed between the planar support member and the front frame of the cushion frame and is displaceable in the compression direction and is also displaceable in the forward and backward swinging direction;
A hook-and-loop fastener that fixes the front elastic support member to the front frame of the cushion frame;
The seat structure according to claim 1, wherein the elasticity of the front elastic support member and the elasticity of the surface fastener in the surface direction are utilized for elastic support of the planar support member and the base net.   2. The seat structure according to claim 1, wherein a front portion of the base net portion for cushion is formed in a bag shape, and a portion formed in the bag shape is disposed so as to cover the front portion of the front surface support member. .   The seat structure according to claim 2, wherein a portion of the cushion base net portion formed in a bag shape covers the front portion of the front surface support member, and both are disposed via a hook-and-loop fastener.   The at least upper part of the said base net part for backs is formed in a bag shape, The part formed in this bag shape is arrange | positioned so that the at least upper part of the said back frame may be coat | covered and arrange | positioned. The described seat structure.   The damping ratio when the base net is stretched on the measuring jig is 0.15 or less, and the damping ratio of the portion supporting the vicinity of the center of gravity of the seated person when stretched on the cushion frame and the back frame is 0. It is 1-0.15, The seat structure of any one of Claims 1-4.   The said front part elastic support member has a three-dimensional solid knitted fabric of predetermined thickness, and is the structure which the elasticity of thickness direction and the elasticity of the rocking | fluctuation direction to the front and back act. The seat structure according to 1.   The seat structure according to claim 6, wherein the front elastic support member further includes a foamed resin elastic member interposed between the three-dimensional solid knitted fabric and the front frame.   The seat structure according to any one of claims 1 to 7, further comprising a rear elastic support member disposed between the planar support member and a rear frame of the cushion frame.   The seat structure according to claim 8, wherein the rear elastic support member includes a three-dimensional solid knitted fabric having a predetermined thickness.   The seat structure according to any one of claims 1 to 9, wherein the planar support member includes a foamed resin elastic member having a predetermined thickness.   The planar support member is formed in a cross-sectional curved shape with a concave central part, and a gap is formed between the base net and the planar support member when no load is applied. The seat structure according to any one of 1 to 10.

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