JP5210043B2 - Seat structure - Google Patents

Description

  The present invention relates to a seat structure formed by suspending a cushion member over a cushion frame, and more particularly to a seat structure suitable for use in transportation equipment such as an aircraft, a train, a ship, and an automobile.

Patent Document 1 discloses a seat structure formed by suspending a cushion member such as a three-dimensional solid knitted fabric on a cushion frame. When the cushion member is formed over the cushion frame, a base net such as a two-dimensional fabric is placed below the cushion member in order to prevent bottoming and improve vibration absorption characteristics and shock absorption characteristics. Through. Patent Document 1 uses two sets of torsion bar units arranged at the front part and the rear part of the seat cushion part as the elastic member.
JP 2006-345902 A

  The structure described in Patent Document 1 has a torsion bar unit, thereby exhibiting excellent vibration absorption characteristics and improving the ride comfort. However, the above-described torsion bar unit is not a cushion member having a surface in contact with the seated person (referred to as “skin material” in the present specification), but has a structure in which a base net disposed below is supported by the torsion bar. . However, since the cushion member constituting the skin material is bridged between the side frames that are spaced and opposed to each other in the width direction of the seat cushion portion, the human thigh is not seated when no load is applied. There are cases where the area around the surface is lifted up and this is a disadvantage in appearance.

  On the other hand, in recent years, in order to reduce the weight of a vehicle such as a vehicle body or an airframe from the viewpoint of improving fuel efficiency, there is an increasing expectation for reducing the weight of seat structures installed on these. In reducing the weight of the seat structure, in the case of the structure of Patent Document 1, it is conceivable that the base net is not employed. However, a torsion bar unit is essential for vibration absorption and shock absorption. However, when the configuration in which the base net is connected to the support frame as in Patent Document 1 is applied as it is to a cushion member used as a skin material, the seat frame is given a feeling of hitting the support frame near the back of the knee. On the other hand, if it is considered to newly arrange another cushion member in order to alleviate this feeling of contact, it is difficult to reduce the weight of the seat structure.

  The present invention has been made in view of the above, and adopts a configuration in which a torsion bar unit absorbs vibration while swinging a seated person's pelvis and thighs back and forth but does not employ a base net. It is possible to provide a seat structure that can be reduced in weight and that does not cause the seat occupant to feel the support frame and can suppress the lifting of the portion corresponding to the lower part of the thigh of the seat occupant when not seated. Let it be an issue.

In order to solve the above-mentioned problem, in the present invention according to claim 1, a seat structure including a cushion member provided to be stretched over a cushion frame,
Between the opposing side frames of the cushion frame, at least one end portion is fixed and supported, and a torsion bar disposed along the width direction of the seat cushion portion;
A rotating member connected to the torsion bar and rotatably provided with the torsion bar as a fulcrum;
A torsion bar unit comprising a connecting member for connecting the rotating member and the cushion member;
The torsion bar is provided at a predetermined twist angle so that when the load mass is unloaded, the elasticity that urges the connecting member in the direction of pulling it downward functions.
Provided is a seat structure characterized in that, when vibration is input when a load of a load mass is applied, the input vibration is isolated by elasticity of the torsion bar.
In this invention of Claim 2, the said rotation member is equipped with the arm connected with the said torsion bar, and the support frame supported by this arm and arrange | positioned substantially parallel to the said torsion bar,
The arm is connected to the torsion bar so as to protrude forward from the torsion bar,
The position of the support frame is closer to the front than the center part in the front-rear direction of the seat cushion part,
The connection member connects the support frame and the cushion member, and the connection position with the cushion member is closer to the rear than the position of the support frame in plan view. Provides a seat structure.
According to a third aspect of the present invention, there is provided the seat structure according to the second aspect, wherein a connection portion of the connection member with the cushion member is a position corresponding to a lower part of a thigh of a seated person.
According to the fourth aspect of the present invention, another torsion bar unit having a torsion bar, a rotating member, and a connecting member, disposed between the opposing side frames of the cushion frame and closer to the rear than the torsion bar unit. With
A connecting member of the other torsion bar unit is connected to a rear edge of the cushion member;
The torsion bar of the other torsion bar unit is provided at a predetermined twist angle so that when the load mass is unloaded, the elasticity that biases the connecting member in the direction of pulling it downward functions.
The seat structure according to any one of claims 1 to 3, wherein when a vibration is input when a load of a load mass is applied, the input vibration is isolated by elasticity of the torsion bar. I will provide a.
In the present invention according to claim 5, the rotating member of the other torsion bar unit includes an arm connected to the torsion bar, a support frame supported by the arm, and disposed substantially parallel to the torsion bar. With
5. The seat structure according to claim 4, wherein the arm is connected to the torsion bar so as to protrude rearward from the torsion bar.
The seat structure according to any one of claims 1 to 5, wherein the cushion member provided by being stretched over the cushion frame constitutes a skin material. I will provide a.

  According to the present invention, the torsion bar unit includes a rotating member that is rotatably provided with the torsion bar as a fulcrum, and a connecting member that connects the rotating member and the cushion member. When the load mass is unloaded, for example, at the time of non-sitting, a predetermined torsion angle is provided so that the elasticity for urging the connecting member in the direction of pulling it downward functions. That is, the cushion member is not directly coupled to the rotating member (support frame), but is coupled via the connecting member, and is biased in the direction of being pulled downward. Thereby, even if it is the structure which does not provide a base net like patent document 1, a torsion bar unit can be arrange | positioned, without giving a seating person the feeling of contact with a rotation member (support frame). As a result, while reducing the weight of the seat structure, when a load mass is applied, for example, when seated, the vibration absorbing function due to the elasticity of the torsion bar can be activated. Further, since the connecting member is biased in the direction of pulling downward when not seated, the cushion member can be prevented from being lifted under the thigh of the seated person, which contributes to the improvement of the appearance.

  Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. 1-4 is a figure which shows the seat structure 1 which concerns on one Embodiment of this invention. The seat structure 1 includes a seat cushion portion 2 and a seat back portion 3. The seat cushion portion 2 includes a cushion frame 20 and a cushion member 200 supported by the cushion frame 20, and the seat back portion 3 includes a back frame 30 and a cushion member supported by the back frame 30. 300.

  As shown in FIGS. 2 and 3, the cushion frame 20 includes a pair of side frames 21 and 21 that are supported by the left and right slide adjusters 40 and that face each other in the width direction of the seat cushion portion 2. . Two sets of torsion bar units 50 and 60 are disposed between the side frames 21 and 21. In the following description, the first torsion bar unit 50 is disposed relatively forward and the second torsion bar unit 60 is disposed rearward. Note that a cushion member 200 constituting a skin material is bridged between the side frames 21 and 21 of the seat cushion portion 2.

  The first torsion bar unit 50 includes a torsion bar 51, arms 52 to 54 that constitute a rotating member, a support frame 55, and a connection member 56. The torsion bar 51 is provided with end portions 51 a and 51 a fixed to the side frames 21 and 21. Three arms 52 to 54 are connected to the vicinity of the end portions 51 a and 51 a and the vicinity of the center of the torsion bar 51. Among these, the arms 52 and 53 arranged in the vicinity of the respective end portions 51a and 51a are configured such that the torsion bar 51 passes through the respective base end portions, and the torsion bar 51 rotates independently with respect to the base end portions. The arm 54 supported and disposed near the center is connected so that the base end 54 a rotates together with the torsion bar 51. The support frame 55 is fitted and fixed to the tip portions 52 b to 54 b of the arms 52 to 54, and is disposed so as to be substantially parallel to the torsion bar 51. As a result, when the support frame 55 moves up and down, all the arms 52 to 54 are rotated accordingly. However, since the arm 54 near the center is connected to rotate together with the torsion bar 51, The vicinity of the center of the torsion bar 51 is twisted relative to the end portions 51a and 51a fixed to the side frames 21 and 21, whereby predetermined elasticity functions. In addition, it is also possible to provide the end portions 51a and 51a of the torsion bar 51 so that only one of them is a fixed end.

  As shown in FIGS. 2 and 3, the arms 52 to 54 are connected to the torsion bar 51 so as to protrude forward of the seat cushion part 2 relative to the torsion bar 51, and the support frame 55 is connected to the seat cushion part. 2 is positioned closer to the front than the center in the front-rear direction. As shown in FIG. 4, the connection member 56 connects the support frame 55 and the cushion member 200, but the connection portion 200 a with the cushion member 200 is more than the position of the support frame 55 in a plan view or a side view. I try to be closer to the rear. The thighs of the seated person are anterior to the seat cushion portion 2 below the sciatic tuberosity (positioned about 100 mm from the boundary between the seat cushion portion 2 and the seat back portion 3) and correspond to the vicinity of the back of the knee. Although it is located in the range slightly rearward from the front edge portion 200b of the seat cushion portion 2, the cushion members can be obtained by setting the mounting positions of the arms 52 to 54, the support frame 55, and the connection member 56 as described above. The connecting member 56 can be connected to the lower thigh 200. In addition, as the connection member 56, fabrics, such as a woven fabric and a nonwoven fabric, a string member, etc. can be used.

  The second torsion bar unit 60 includes a torsion bar 61, arms 62 to 64 that constitute a rotating member, a support frame 65, and a connection member 66. The torsion bar 61, the arms 62 to 64, the support frame 65, and the connection member 66 have the same structure as the torsion bar 51, the arms 52 to 54, the support frame 55, and the connection member that constitute the first torsion bar unit 50. 56.

  However, in the second torsion bar unit 60, the arms 62 to 64 are provided on the torsion bar 61 spanned between the side frames 21 and 21 so as to protrude rearward, and are supported at the tip portion thereof. A frame 65 is provided substantially parallel to the torsion bar 61. As shown in FIG. 4, one end of the connection member 66 is connected to the support frame 65, and the other end is connected to the rear edge portion 200 c of the cushion member 200.

  In addition, as a cushion member 200 which comprises a skin material, although a thin urethane material etc. can also be used, it is preferable to use a three-dimensional solid knitted fabric. Further, a plurality of three-dimensional solid knitted fabrics may be used by being laminated, or a three-dimensional solid knitted fabric and a thin urethane material may be laminated and used. Alternatively, a bead foam such as polystyrene foam may be used in which a highly elastic elastic covering material is attached to at least one surface of the bead foam and laminated on a three-dimensional solid knitted fabric or a urethane material. In addition, the bead foam has the property that the properties of an elastic body appear as it is compressed, and the cushion characteristics become softer. Therefore, when compression molding is performed so that the thickness is reduced by vibration welding or the like at the connection site 200a with the cushion member 200 to which the connection member 56 is connected, as shown in FIG. 4, the cushion member includes the bead foam. When is used, the properties of the bead foam as an elastic body can also function.

  The three-dimensional solid knitted fabric, for example, as disclosed in JP-A-2002-331603, reciprocates between a pair of ground knitted fabrics arranged apart from each other and the pair of ground knitted fabrics. The knitted fabric has a three-dimensional three-dimensional structure having a large number of connecting yarns to be joined. One ground knitted fabric is formed by, for example, a flat knitted fabric structure (fine stitches) that is continuous in both the wale direction and the course direction from a yarn obtained by twisting a single fiber. For example, a knitted structure having a honeycomb-shaped (hexagonal) mesh is formed from a yarn obtained by twisting short fibers. Of course, this knitted fabric structure is arbitrary, and it is also possible to adopt a knitted fabric structure other than a fine structure or a honeycomb shape, and a combination thereof is also arbitrary, such as adopting a fine structure for both. The connecting yarn is knitted between two ground knitted fabrics so that one ground knitted fabric and the other ground knitted fabric maintain a predetermined distance.

  The three-dimensional solid knitted fabric is thin but has high restoring force, moderate elasticity, and exhibits soft spring characteristics at a single point concentrated load, but has a high surface rigidity and is hard at a predetermined surface contact. It has the characteristic of exhibiting the spring characteristics, and has the spring characteristics that tend to approximate the human buttocks muscles. Therefore, when this three-dimensional solid knitted fabric is used as the cushion member 200, a layer having characteristics approximating that of human muscles is disposed, and external force can be effectively applied without a sense of incongruity caused by partial depression. Can be distributed.

  Here, the torsion bar 51 constituting the first torsion bar unit 50 is set so as to be twisted at a predetermined torsion angle when not seated, and is connected to the vicinity of the center of the torsion bar 51. 54 is set so that the elasticity acts in a direction of rotating diagonally forward and downward (in the direction of arrow X in FIG. 4). As a result, when not seated, the connecting member 55 is pulled in the direction of the arrow X, and the cushion member 200 is similarly pulled in the direction of the arrow X by the connecting portion 200a with the connecting member 55. Thereby, the floating at the time of non-seating of this cushion member 200 is suppressed.

  The torsion bar 61 constituting the second torsion bar unit 60 is also set in a state of being twisted at a predetermined torsion angle when not seated, and the arm 64 connected to the vicinity of the center of the torsion bar 61 is moved downward ( It is set so that the elasticity works in the direction of rotation in the direction of arrow Y in FIG. As a result, the connection member 66 and the rear edge portion 200c of the cushion member 200 are pulled downward, and the rear edge portion 200c of the cushion member 200 is also prevented from rising.

  When a person sits in this state, the cushion member 200 is displaced downward from the position indicated by the solid line in FIG. 4 to the position indicated by the two-dot chain line. When the cushion member 200 is displaced downward, the connection members 56 and 66 of the first and second torsion bar units 60 are loosened according to the displacement, so that the torsion bars 51 and 61 that are twisted in the initial state are twisted. The arm 52 to 54 and the support frame 55 of the first torsion bar unit 50 and the arms 62 to 64 and the support frame 65 of the second torsion bar unit 60 are also shown in the two-dot chain line in FIG. It rotates to the position indicated by.

  When vertical vibrations are input from the vehicle body floor in the seated state, the torsion bars 51 and 61 are twisted in accordance with the vertical input vibrations, and the vertical vibrations are converted into vertical and front / rear direction forces to be isolated. In particular, it is effective for vibration isolation of high-frequency minute vibrations. In addition, the first torsion bar unit 50 pulls the cushion member 200 in an oblique direction via the arms 52 to 54, the support frame 55, and the connection member 56. Vibration is removed by the relative movement of the direction. When the cushion member 200 moves relatively in the front-rear direction, the arms 62 to 64 and the support frame 65 are also elastically displaced via the connecting member 66 in the second torsion bar unit 60, and the cushion member Helps 200 relative back and forth movements.

FIG. 1 is an external view showing a seat structure according to one embodiment of the present invention. FIG. 2 is a view showing a frame structure of the seat structure of FIG. FIG. 3 is a diagram showing the structure of the cushion frame. FIG. 4 is a cross-sectional view taken along the line CC in FIG. 1 and is a view for explaining the operation of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat structure 2 Seat cushion part 3 Seat back part 20 Cushion frame 21 Side frame 30 Back frame 50 1st torsion bar unit 51 Torsion bar 52-54 Arm 55 Support frame 56 Connection member 60 2nd torsion bar unit 61 Torsion bar 62 to 64 Arm 65 Support frame 66 Connection member 200 Cushion member 300 Cushion member

Claims (6)

A seat structure including a cushion member provided to be stretched over a cushion frame,
Between the opposing side frames of the cushion frame, at least one end portion is fixed and supported, and a torsion bar disposed along the width direction of the seat cushion portion;
A rotating member connected to the torsion bar and rotatably provided with the torsion bar as a fulcrum;
A torsion bar unit comprising a connecting member for connecting the rotating member and the cushion member;
The torsion bar is provided at a predetermined twist angle so that when the load mass is unloaded, the elasticity that urges the connecting member in the direction of pulling it downward functions.
A seat structure characterized in that, when vibration is input when a load of a load mass is applied, the input vibration is isolated by elasticity of the torsion bar. The rotating member includes an arm connected to the torsion bar, and a support frame supported by the arm and disposed substantially parallel to the torsion bar.
The arm is connected to the torsion bar so as to protrude forward from the torsion bar,
The position of the support frame is closer to the front than the center part in the front-rear direction of the seat cushion part,
The connection member connects the support frame and the cushion member, and the connection position with the cushion member is closer to the rear than the position of the support frame in plan view. Seat structure.   The seat structure according to claim 2, wherein a connection portion of the connection member with the cushion member is a position corresponding to a lower part of a thigh of a seated person. Between the side frames facing the cushion frame, another torsion bar unit having a torsion bar, a rotating member, and a connecting member, which is disposed closer to the rear than the torsion bar unit, is provided.
A connecting member of the other torsion bar unit is connected to a rear edge of the cushion member;
The torsion bar of the other torsion bar unit is provided at a predetermined twist angle so that when the load mass is unloaded, the elasticity that biases the connecting member in the direction of pulling it downward functions.
The seat structure according to any one of claims 1 to 3, wherein when a vibration is input when a load of a load mass is applied, the input vibration is isolated by elasticity of the torsion bar. . The rotating member of the other torsion bar unit includes an arm connected to the torsion bar, and a support frame supported by the arm and disposed substantially parallel to the torsion bar.
The seat structure according to claim 4, wherein the arm is connected to the torsion bar so as to protrude rearward from the torsion bar.   The seat structure according to any one of claims 1 to 5, wherein the cushion member provided by being stretched over the cushion frame constitutes a skin material.

Images