JP4196744B2 - Vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat installed in a vehicle, and more particularly, to a shape of a seat cushion that holds a butt portion of a seated person.
[0002]
[Prior art]
In a vehicle seat, the seating comfort deteriorates due to the seated portion of the seat occupying the seat cushion inappropriately sinking into the seat cushion. It is known that this sinking deeply sinks in the back, particularly in the rear, and as a result, the bottom (pelvis) is tilted backward from the proper position. In order to prevent the rear part from tilting backward, for example, as shown in FIG. There is. In the seat cushion 21, the amount of the cushion material corresponding to the rear of the butt portion is increased by the build-up 27 so that the butt rear portion can be held more stably.
In order to improve sitting comfort, it is also important to satisfy other various factors. For example, a method of setting the seat shape so as to obtain a good seating pressure distribution is known (for example, Patent Document 1). reference.).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 7-143922
[Problems to be solved by the invention]
However, in the method of adding a pad to prevent the back of the butt from being tilted, the ability to hold the butt depends on the performance of the pad, so the seating comfort changes greatly depending on the selected pad material and the deterioration of the pad. ing. Further, since the pad is added to the rear of the hip, the necessary pad weight is increased accordingly.
[0005]
Therefore, an object of the present invention is to provide a vehicle seat that can hold a seated person's buttocks in an appropriate state more stably.
[0006]
[Means for Solving the Problems]
To solve the above problems, the present invention can hold the buttocks of the seated person, comprising a frame member, a seat cushion and a pad provided on an upper surface of the frame member, the frame member, of the seated person It has a lowest point at a position corresponding to the front part of the front part of the front half in the front-rear direction of the bottom part formed in the convex curved surface, which is ahead of the hip point. Provided is a vehicle seat that is formed in a curved shape having a radius of curvature larger than a bottom portion and inclined upward .
In this seat, the buttocks are held at the angle of the buttocks in an appropriate sitting posture by the frame member. For this reason, the holding angle of the buttocks is hardly changed due to the material of the pad, deterioration with time, etc., and the sheet can maintain the holding angle stably over a long period of time. In addition, since the holding angle of the butt portion depends on the frame member, a pad having various properties can be selected, and the butt portion can be held in an appropriate state to obtain a seat that can hold an appropriate sitting posture. .
[0007]
Further, in this seat, the frame member has a lowermost point at a position corresponding to the front part of the front part of the front half of the front part in the front-rear direction of the bottom part formed on the convex curved surface, in front of the hip point. Since it has, the bottom part is hard to sink backwards. Further, the frame member is formed in a curved surface shape having a larger radius of curvature toward the rear of the buttocks and inclined upward from the lowest point. Can be set to be held at. Accordingly, the sheet can suppress the rearward inclination of the hip and maintain a good holding angle.
Here, the hip point is the position of the hip point when a 3DM mannequin based on SAE-J826 or a mannequin equivalent thereto is seated on the seat, and preferably a 3DM mannequin is used. The hip point in the 3DM mannequin is the center of rotation between the torso and thigh, and corresponds to the hip joint of the human body.
[0008]
Moreover, in the said sheet | seat, the thickness of the pad in a perpendicular direction provides the sheet | seat which is the maximum in the position which passes the lowest point.
In the seat cushion, if the pad thickness from the bottom surface to the frame member is small, the bottom portion is unlikely to sink. For this reason, in the frame member that is inclined upward from the lowest point toward the rear of the buttocks, if the thickness of the pad at the lowest point is maximum, the buttocks easily sink to the lowest point. Therefore, the seat can suppress the rearward inclination of the seated person and maintain a good holding angle.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The vehicle seat according to the present embodiment may be a seat having various structures in which a seat cushion constituting the seating portion includes a pad member. The seat may be a seat in which the seating portion and the backrest portion are integrally formed, but typically, a seat cushion corresponding to the seating portion and a seatback corresponding to the backrest portion are configured separately. Vehicle seats connected together. Specifically, for example, the vehicle seat includes a seat cushion in which a pad is placed on a frame member and covered with a skin material.
[0010]
Since the characteristic part of the present invention is in the seat cushion and other parts can be applied to known forms, the seat cushion of the vehicle seat will be described in detail below.
FIG. 1 shows a cross-sectional view of the vicinity of the center of a seat cushion 1 according to an embodiment of the present invention. The seat cushion 1 includes a frame member 3 made of a panel and a pad 5 and is mounted on the vehicle body floor side via a seat frame and a slide rail (not shown).
The frame member 3 is a member that defines the shape of the lower portion of the pad on the seating surface side. In this embodiment, a plate-like member such as metal or resin is formed into a predetermined shape. The frame member 3 is formed so as to be positioned by latching or the like on the seat frame side. Note that a plurality of recesses 3a and through holes 3b are partially formed in the frame member 3 shown in FIG. 1 in order to improve the strength and weight of the frame member 3.
[0011]
The pad 5 is formed of a foamed molded article containing a known polyurethane or the like, and is a member that is elastically deformed and supported along the buttocks and thighs of the seated person at the time of sitting. The pad 5 is integrated with the frame member 3 so as to be in close contact with each other, and the upper surface forms a seating surface of the seat cushion. The pad 5 can be formed of a material having various rebound resilience, vibration absorption performance, and the like according to the characteristics and purpose of the vehicle.
Further, in FIG. 1, a skin material 7 formed of leather, fabric, or the like is provided on the surface opposite to the surface in contact with the frame member 3 of the pad 5, and the surface of the seat cushion 1 is the skin material 7. It is covered with.
[0012]
The seat cushion 1 is designed so that an appropriate seating posture can be stably maintained. An appropriate sitting posture is proposed by various experiences and studies including various elements, and is not particularly limited. In general, the pelvis is prevented from tilting backwards, and the posture is not easily collapsed even after sitting for a long time, and it is difficult to cause problems such as back pain. In the seat cushion 1, the frame member 3 is formed in a shape that can hold the buttocks at an angle in this proper sitting posture when a human (manikin) is seated on the vehicle seat in the front-rear direction of the seat.
[0013]
The frame member 3 is preferably shaped so that the hip (human pelvis) is less likely to tilt backward and that it is easy to achieve an appropriate seat pressure distribution at an appropriate seating position. Specifically, the frame member 3 is formed in a shape that is inclined at least directly below the bottom part, preferably upward from the front part of the bottom part to the rear, while being attached to the seat frame or the like. preferable. The inclined portion of the frame member 3 may be substantially planar, but is preferably formed in a curved shape.
[0014]
On the other hand, it is preferable that the front from the portion corresponding to the bottom of the frame member 3 has a shape that is inclined upward toward the front, like the conventional cushion frame member. The upward inclination is such that the thigh and the like are held within a range in which the front part of the buttocks does not lift upward. Thereby, it can avoid that the rear part of a bottom part is located below the front part of a bottom part, and can suppress the back inclination of a bottom part.
[0015]
Therefore, in a state where the frame member 3 is mounted on the seat frame or the like, the lowermost portion, that is, the lowest point 13 is located at the front or rear center of the buttocks, preferably at the buttocks front 15. The shape is preferred. The specific overall shape of the frame member 3 is preferably a shape having the lowest point 13 at a position corresponding to the front part 15 of the buttocks and inclined upward in both the front and rear directions. Note that the front part of the bottom is defined as a front half range in the front-rear direction of the bottom formed on the convex curved surface in this specification.
[0016]
In the present embodiment shown in FIG. 1, a lowermost point 13 is provided at a position corresponding to the buttocks front portion 15, and is formed so as to be inclined upward from the lowest point 13 toward the rear of the buttocks. Yes. It is preferable that the inclined portion is formed in a curved surface having a larger radius of curvature than the butt portion as in the present embodiment, so that the butt portion of people of various physiques can be stably held. Moreover, in FIG. 1, the front side from the lowest point 13 extends upward in a substantially straight line with a larger inclination angle than the rear side.
[0017]
In addition, as shown in FIG. 2, in the seat cushion 1 according to the present invention, the pad 5 and the frame member 3 are the hip point (hereinafter referred to as HP) of the 3DM mannequin when the 3DM mannequin is seated on the seat. It has a lowermost point 13 in the front and is inclined upward from the lowermost point 13 toward the rear of the bottom. H. P. If there is a lowest point 13 ahead of H. P. Since it becomes easier to sink forward, the backward tilt is relatively suppressed. H. P. The measurement method is based on ISO 6549-1980. Also in this case, it is preferable that the inclined portion toward the rear of the butt is formed in a curved surface having a larger radius of curvature than the butt. Thereby, the bottom part of the person of various physiques can be held stably.
[0018]
In such a seat cushion 1, the pad 5 is preferably formed so that the thickness in the vertical direction (A in FIG. 2) is maximized at a position passing through the lowest point 13. In other words, it is preferable that the vertical length from the surface of the pad 5 to the frame member 3 is maximized at a position passing through the lowest point 13. The lowest point 13 is H.264. P. Therefore, the frame member 3 is likely to be closer to the rear part of the butt portion of the seated person. Since the position and angle of the butt portion can be more strongly regulated by the arrangement position and / or arrangement angle of the frame member 3, the rear portion of the butt portion is supported by the frame member 3, and the position and angle are more strongly set to a desired position. , Can be guided to the angle. Further, in this configuration, the seated person's bottom part is more likely to sink directly below the hip point due to the relationship with the seating pressure distribution of a normal seated person, and the back part of the bottom part is relatively less likely to sink.
[0019]
Further, when the thickness of the pad ahead of the lowest point 13 is small, the frame member 3 comes closer to the front part of the bottom part as compared with the position directly below the bottom part. Thereby, a bottom part can be hold | maintained more stably. In addition, the bottom portion becomes more unstable at a position shallower than the proper position, that is, at a more forward position, and it is easy to avoid the backward tilt state by guiding to the proper position.
[0020]
In addition, the pad 5 of this embodiment is formed in the shape provided with the stress concentration part 5a formed in concave shape toward the back in the thickness direction lower part of the front end side. The stress concentrating part 5a is a part that is easily elastically deformed by a load by the thigh, thereby improving the seating feeling (cushion feeling and fit feeling) of the seated person and supporting the thigh more upward. Therefore, the comfort of seating in which the buttocks do not tilt backward is avoided.
[0021]
When sitting on a vehicle seat provided with the seat cushion 1, it is possible to sit in a state where the hips are held at an optimal position and angle by sitting in the same manner as in the past. Therefore, the vehicle seat provided with the seat cushion 1 can form an appropriate seating posture set in the seat design or a good seating posture close thereto, and low back pain and back even in a long-time seating. It is possible to satisfactorily suppress the occurrence of pain due to pain and fatigue due to an inappropriate sitting posture.
[0022]
In particular, when the frame member 3 is located at the lowest position directly below the buttocks and is disposed at a higher position in both front and rear, the buttocks are naturally optimally positioned even when sitting so as to slide from the front of the seat. Easy to move up to. And, by the inclined surface of the part corresponding to the rear part of the bottom part of the frame member 3, the rear part of the bottom part can be satisfactorily suppressed and held at a better angle.
Further, since the thickness of the pad 5 in the vertical direction is set to be maximum at the lowest point 13 of the frame member 3, even when a force in the backward tilt direction is applied to the buttocks, Inclination can be suppressed and held stably at a predetermined position and angle more stably.
[0023]
Furthermore, by setting the vertical thickness at the front side of the seat cushion 1 to be equal to the vertical thickness (A) at the lowest point 13, when the seated person is seated to slide from the front of the seat, The angle of the butt (pelvis) is difficult to tilt in the middle. As a result, it is possible to easily obtain a naturally preferable angle when the seating is completed. In addition, it is difficult to hold the hips in the rearward tilted state, and the seating comfort in the rearward tilted state has deteriorated. It can be expected to try to maintain a sitting posture).
[0024]
Further, since the setting of the holding position and the holding angle largely depends on the shape of the frame member 3, the holding position and the holding angle are not easily changed even by deterioration of the pad material. Therefore, the seat of the seated person can be held at an appropriate position and angle over a long period of time, and the vehicle seat can be easily seated in an appropriate seating posture or a good seating posture close thereto. In addition, a vehicle seat having various cushioning feelings and fitting feelings using a pad having various properties (rebound resilience, flexibility, etc.) and capable of holding a seated person's buttocks and maintaining a good sitting posture; can do.
[0025]
The vertical thickness of the pad 5 can be set by adjusting the shape of the frame member 3 and the shape and thickness of the pad 5, but the pad 5 having various properties can be obtained by increasing the dependency on the frame member shape. It becomes easy to use. Moreover, the influence on the surface shape of the seat cushion can be reduced, and various designs can be imparted to the vehicle seat of the present invention.
[0026]
In addition, when the frame member 3 has a shape that is inclined upward toward the rear of the hip, the lower surface of the rear portion of the seat cushion can be formed in a shape that is inclined upward toward the rear. Therefore, a larger space can be secured under the rear portion of the seat cushion, and for example, it can be used as a space for a foot of a seated person behind the seat cushion or a storage space. Further, by reducing the volume of the seat cushion, particularly the volume of the pad, it is possible to reduce the weight of the vehicle seat and reduce the cost. Moreover, although the said embodiment demonstrated the form whose frame member is a panel, it can be set as the structure which can hold | maintain various pads, such as a wire and a spring, in a sheet | seat shape.
[0027]
【The invention's effect】
In the present invention, it is possible to make it easier for a seated person to maintain a good seating posture by providing a seat that can more stably hold the buttocks of the seated person in an appropriate state.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a pad and a frame member portion of a seat cushion of a vehicle seat according to an embodiment of the present invention.
2 is a cross-sectional view showing a vertical thickness (A) of a pad of a seat cushion of the vehicle seat of FIG. 1;
FIG. 3 is a cross-sectional view showing a pad portion of a conventional vehicle seat.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat cushion 3 Frame member 3a Recess 3b Through-hole 5 Pad 5a Stress concentration part 7 Skin material 13 Bottom point 15 Bottom part front part 21 Seat cushion 25 Cushion pad 27 Overlay

Claims (2)

A seat cushion having a frame member and a pad provided on the upper surface of the frame member;
This frame member has a lowermost point at a position corresponding to the front part of the front part of the front half of the front part in the front-rear direction of the bottom part formed on the convex curved surface in front of the hip point of the seated person. The vehicle seat is formed in a curved shape having a radius of curvature larger than that of the butt portion from the lowest point toward the rear of the butt portion and inclined upward . The vehicle seat according to claim 1 , wherein the thickness of the pad in the vertical direction is maximum at a position passing through the lowest point .

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