JP4102117B2 - Seat cushion - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat cushion material, and more particularly to a seat cushion material used for a seat of a chair or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a chair seat or the like, in order to improve sitting comfort, a spring material or a cushion material in which urethanes having different hardnesses are bonded is known.
[0003]
[Problems to be solved by the invention]
By the way, in order to improve the sitting comfort without getting tired even if sitting for a long time and the buttocks do not hurt, proper body pressure distribution and the appropriate amount of sinking are attempted when sitting, and the appropriate compressive stress is applied. It is necessary to maintain a correct sitting posture in order to work.
[0004]
However, in the case where the conventional spring material is incorporated or the cushion material in which urethanes with different hardnesses are laminated is incorporated, a proper body pressure distribution and an appropriate amount are applied to a minute part on the seating surface. It was not possible to adjust so that a suitable compressive stress acted by sinking.
[0005]
Therefore, the present invention forms a large number of adjustment holes in the cushion material body, and sets the shape of the large number of adjustment holes for each part where the body pressure is different so that the body pressure is properly distributed to the details of the seating surface. Another object of the present invention is to provide a seat cushion material that maintains a correct seating posture by applying an appropriate amount of sinking and applying an appropriate compressive stress, and that is less fatigued.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the first invention according to claim 1 is a part in which a bottomed adjustment hole whose back side is open and whose front side is closed is located in the sacral part in the cushion material body. And a part located in the ischial part, a part located in the thigh, and a part located around the sacrum and the sciatic part, and the adjustment hole located in the sciatic part has a large diameter, the sacral part The diameter of the adjustment hole located in the thigh and the thigh is set to a medium diameter smaller than the diameter of the adjustment hole located in the ischial part, and the diameter of the adjustment hole located around the sacrum and the scapular part is designated as the sacrum. The diameter is smaller than the diameter of the adjustment hole located in the thigh and the thigh .
[0012]
In the present invention, when this cushioning material is used for a seat and seated, since the adjustment hole located in the seat bone portion has a large diameter, the sinking of the buttocks increases, and the adjustment hole has a large diameter. Even if the portion is slightly deviated from the predetermined position, the seat bone portion is positioned in the adjustment hole, and the correct sitting posture can be maintained.
[0013]
Moreover, since the adjustment hole located in a sacrum part was made into the adjustment hole of a medium diameter, it prevents that a sacrum part sinks too much and a pelvis part rotates. Moreover, since the adjustment hole located in the thigh is formed as an adjustment hole having a medium diameter, large depression of the thigh is prevented and displacement of the buttocks (sciatic bone) is also prevented.
[0014]
Furthermore, by arranging the small-diameter adjustment holes around the adjustment holes in the sacrum and the scapula portions, the buttocks sink into a necessary round shape, and the body pressure distribution is improved.
[0015]
The second invention of claim 2, wherein, in the first invention, the adjustment hole located at the ischium portion, and is formed in two stages like holes having a small diameter hole in its inner part.
[0016]
In the present invention, the adjustment hole of the sciatic part is made larger than the surrounding adjustment hole, and the adjustment hole is a two-stage hole. Therefore, the sciatic part is guided to the adjustment hole for the sciatic part, and pressure is applied. Can be missed.
[0017]
A third invention of claim 3, wherein, in the first or second aspect of the invention, the adjustment hole located at the sacral, and adjustment hole located at the ischium portion, around the sacral region and ischial portion The depths of the adjustment holes that are positioned are made substantially equal, and the adjustment holes that are positioned in the thighs are holes that gradually increase in depth from the hip side toward the knee side.
[0018]
In the present invention, since the adjustment hole of the thigh is a hole that gradually becomes deeper as it goes to the knee side, body pressure becomes easier to escape as it goes to the knee side, and the compression pressure becomes smaller, There is less pressure on the thigh.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described based on an embodiment shown in the drawings.
[0020]
FIG. 1 is a diagram showing a state in which a cushion seat made of urethane is provided on a seat of a chair, and a person is seated on the cushion material 1 (the cover material is omitted), 2 is a body, 3 is a sacrum, Reference numeral 4 denotes a seat bone, 5 denotes a thigh, and 6 denotes a lower leg. In the figure, 7 indicates a backrest.
[0021]
Next, the body pressure distribution on the cushion material in the seated state as shown in FIG. 1 will be described with reference to FIGS.
[0022]
FIG. 2 shows a good body pressure distribution state, B is the pressure at the thigh 5, C is the pressure at the ischial 4, D is the pressure at the sacrum 3, and these pressures are A <B <D <C relationship. That is, the compressive stress is small in the forward direction around the portion C where the seat bone 4 is located, and the compressive stress is large on the left and right sides. Therefore, the body pressure is neatly distributed in a tomographic manner centering on the seat bone 4 (pressure C), the rotation of the pelvis is small, a correct seating posture is maintained, and the seat is comfortable.
[0023]
FIG. 3 shows a poor body pressure distribution state, B is the pressure in the thigh 5, C is the pressure in the ischial 4, D is the pressure in the sacrum 3, and these pressures are A <B <C <D Are in a relationship. Therefore, in this state, the amount of depression of the buttocks is excessive, the pelvis rotates, and the sacrum 3, the thigh 5 and the crus 6 are greatly depressed and pressed, and the correct sitting posture cannot be maintained. It becomes a seat that is not comfortable to sit on.
[0024]
Therefore, the present invention is provided with a large number of adjustment holes in the cushion material, and the body pressure dispersion as shown in FIG.
[0025]
4 to 9 show a seat cushion material in which the adjustment hole of the present invention is formed.
[0026]
FIG. 4 is a diagram showing the positional relationship between the sacrum 3, the scapula 4, the thigh 5, the lower thigh 6 of the body 2 and the respective adjustment holes formed in the cushion material when a person is seated on the cushion material of the present invention. is there.
[0027]
The cushion material body 8a forming the cushion material 8 is formed of urethane so as to be seated, and in the illustrated embodiment, as shown in FIGS. 8 and 9, the width is 500 mm, the depth is 550 mm, and the thickness is Is formed in a plate shape of 90 mm.
[0028]
Each of the adjustment holes 11 to 19 formed in the cushion material 8 is formed as a bottomed hole having an opening on the back surface 8b side of the cushion material body 8a and a non-opening surface on the front surface 8c side. The amount of subsidence (cushioning) is adjusted by the depth. The cushion material body 8a and each of the adjustment holes 11 to 19 are formed by placing a mold bar for forming the adjustment hole in the mold and foaming urethane in the mold.
[0029]
As described above, when the bottomed adjustment holes 11 to 19 are formed in urethane, which is an elastic material, the characteristics depending on the diameter, depth, density, and shape of the hole in the depth direction are as follows. It seems to be.
[0030]
As the diameter (size) of the adjustment hole is larger, the compressive stress of urethane is smaller as the diameter is larger, and is greatly related to dispersion of body pressure. The depth of the adjustment hole mainly relates to the amount of urethane subsidence, and the deeper the subsidence amount, the greater the depth of the adjustment hole and the seating posture. The arrangement density of the adjustment holes is related to body pressure dispersion, and the greater the density, the greater the dispersibility. The shape of the adjustment hole in the depth direction affects the change in how the body pressure escapes in the hole, and the direction in which the body pressure escapes can be controlled by the shape.
[0031]
By utilizing such characteristics of the hole, the present invention selects the diameter, depth, density, etc. of the hole so that the heel part where the body pressure is most depressed sinks into the shape with the necessary roundness. In order to prevent the repulsive force from being too small, the narrow hole was arranged in accordance with the required submerged shape.
[0032]
Specifically, nine types of adjustment holes 11 to 19 were provided and arranged as shown in FIG.
[0033]
The first adjustment hole 11 at the portion where the seat bone 4 hits while the collar portion 20 is located is such that a strong pressure is applied only to the tip portion of the seat bone 4 when sitting, and the seat bone 4 is positioned at the position of the adjustment hole when sitting. Since it is not always the case, it is a hole with the largest diameter larger than the other adjustment holes, and as shown in FIG. 7, it is a two-stage hole with a thin diameter step portion 11a as shown in FIG. The seat bone 4 was guided toward the large adjustment hole 11 to release the pressure. The cross-sectional shape and dimensions of the first adjustment hole 11 are shown in FIG. The unit of the dimension in FIG. 8 is mm.
[0034]
The second adjustment hole 12 where the sacrum 3 hits is a hole with a medium diameter that is thinner than the first adjustment hole 11 and is deep because the sacrum 3 is most susceptible to pressure in the buttocks. If the sacrum 3 sinks too much, the pelvis rotates and the correct sitting posture cannot be obtained. Therefore, the diameter around the second adjustment hole 12 is larger than that of the second adjustment hole 12 in order to keep the repulsive force. A third adjustment hole 13 and a fourth adjustment hole 14 which are small and have the same depth as the second adjustment hole 12 are arranged. The cross-sectional shapes and dimensions of the second adjustment hole 12, the third adjustment hole 13, and the fourth adjustment hole 14 are shown in FIGS.
[0035]
Furthermore, a fifth adjustment hole 15 that is substantially the same as the fourth adjustment hole 14 is provided around the first adjustment hole 11 so that good body pressure distribution is performed. . The cross-sectional shape and dimensions of the fifth adjustment hole 15 are shown in FIG.
[0036]
The diameters of the adjustment holes 13, 14, 15 are set to 14 <13 <15.
The part where the thigh 5 hits has the highest pressure in the part that continues from the buttocks, and requires a deep subsidence that matches the buttocks, so that it has a medium diameter that is almost the same as the second adjustment hole 12, and A deep sixth adjustment hole 16 substantially the same as the second adjustment hole 12 is formed. Further, the thigh 5 is more susceptible to compression pressure as it goes in the knee direction. Therefore, in order to release the compression pressure, the tip (knee direction) side of the sixth adjustment hole 16 is A seventh adjustment hole 17, an eighth adjustment hole 18, and a ninth adjustment hole 19 that are the same diameter as the sixth adjustment hole 16 and gradually become deeper toward the knee are formed. The cross-sectional shapes and dimensions of these adjustment holes 16 to 19 are shown in FIG.
[0037]
The arrangement of the adjustment holes 11 to 19 is in the state shown in FIG. 5, and is arranged symmetrically about the center line XX of the cushion material body 8 a.
[0038]
Each of the adjustment holes has a density of the first adjustment hole 11 to the fifth adjustment hole 15 located in the heel part 20 so that the density of the sixth adjustment hole 16 to the ninth adjustment hole located in the thigh part 5 The density is set to be greater than 19. The arrangement intervals (density) of the adjustment holes 11 to 19 are shown in FIG. The unit of the dimension in FIG. 9 is mm.
[0039]
The cross-sectional shape of each of the adjustment holes 11 to 19 may be a square (square hole), a triangle (triangular hole), an oval (long hole), or the like other than the circle (round hole) as in the above embodiment. In addition, the vertical cross-sectional shape of each of the adjustment holes 11 to 19 may be V-shaped. Further, the dimensions of the adjustment holes 11 to 19 are not limited to the values in the above-described embodiment, and the relative relationship as described above is satisfied. I just need it. Further, the number of the adjustment holes 11 to 19 is not limited to the number of the above-described embodiments.
[0040]
【The invention's effect】
As described above, according to the present invention, since the adjustment hole is arranged at a predetermined position with a predetermined size and a predetermined shape, the body pressure dispersion and the sinking amount are optimally adjusted, and the correct sitting posture It is possible to provide a cushioning material for a seat that is comfortable and comfortable, and a chair.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram for explaining a sinking state of a cushion material when seated on a chair.
FIG. 2 is a view for explaining good body pressure dispersion to a cushion material.
FIG. 3 is a diagram for explaining poor body pressure dispersion to a cushion material.
FIG. 4 is a diagram illustrating a sitting state in the cushion material of the present invention.
FIG. 5 is a back view of the cushion material of the present invention.
6 is a left side view in FIG.
7 is a cross-sectional view taken along line AA in FIG.
FIG. 8 is a diagram showing a cross-sectional shape and dimensions of an adjustment hole in the cushion material of the present invention.
FIG. 9 is a view showing the arrangement dimensions of the adjustment holes in the cushion material of the present invention.
[Explanation of symbols]
8 Cushion material 8a Cushion material main body 8b Back surface 8c Front surface 11 Adjustment hole 11a located in the seat bone part Small hole 12 in the back Adjustment hole 13-15 located in the sacrum part Adjustment hole 16 formed in the circumference Adjustment hole 17-19 Thigh Adjustment hole located at

Claims (3)

A bottomed adjustment hole whose back side is open and whose front side is closed is formed in the cushion material body, a part located in the sacrum part, a part located in the seatbone part, a part located in the thigh part, and a sacrum The adjustment hole located in the peripheries and the peri-sciatic part is arranged, the adjustment hole located in the ischium part is adjusted to have a large diameter, and the diameter of the adjustment hole located in the sacral part and the thigh part is adjusted to be located in the ischium part. The diameter of the adjustment hole located around the sacrum and the scapula is set to a small diameter smaller than the diameter of the adjustment hole located in the sacrum and the thigh. A characteristic cushioning material for seats. The adjustment hole located at the ischium portion, the seat cushioning member according to claim 1, wherein forming a two-step form hole provided a small diameter hole in its inner part. The adjustment hole located in the thigh is made substantially the same in depth as the adjustment hole located in the sacrum, the adjustment hole located in the ischia, and the adjustment hole located around the sacrum and the scapula The seat cushion material according to claim 1 or 2, wherein the hole is formed into a hole whose depth is gradually increased from the buttocks side to the knee side.

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