JP5465533B2 - Cushion with built-in liquid for backrest etc. - Google Patents

Description

  The present invention relates to a cushion for a backrest or the like that can be disposed on an inclined surface such as a back portion of a chair on which a person can be seated, or a vertical surface, and more particularly, to a liquid-containing cushion made of a flexible synthetic resin sheet. .

  Conventionally, as an aqueous liquid containing bag made of a synthetic resin sheet, a bag used as a water pillow, a water bed, etc. that does not propagate vibration, fits softly on the body, and has a good head sitting is known.

For example, as shown in Patent Document 1, it is a bag that contains an aqueous liquid and is hermetically sealed, which is formed by fusing overlapping soft plastic sheets along the periphery. Each of the plurality of chambers is connected to an adjacent chamber via a liquid flow path, and is divided into a plurality of chambers by a mesh-bonded band formed by fusing the sheets facing each other at a contact surface. The liquid flow path is formed so as to provide a discontinuous portion in the fusion zone so as to form a limited gap, and when the chamber is pressurized from the outside, the liquid channel is formed from the chamber. There has been proposed an aqueous liquid containing bag configured such that the outflow of liquid is delayed by the resistance of the liquid flow path.
JP 2000-217685 A

  However, in Japanese Patent Application Laid-Open No. 2000-217685, the above-described aqueous liquid storage bag is divided into a plurality of chambers by a cohesive band arranged in a mesh pattern, and each of the plurality of chambers is separated from an adjacent chamber. Although it is disclosed as a bag made of a soft plastic sheet containing an aqueous liquid and sealed, which is communicated through a liquid flow path, it is disclosed that it is used as a water pillow, a water bed, etc. It is not disclosed that it is used by being placed on the back portion of a chair on which a person can sit. In a plastic sheet bag having a plurality of chambers that are separated and communicated by a cohesive band arranged in a mesh shape, it does not correspond to the human body shape, and follows the change in the posture of the person, It was virtually impossible to effectively distribute body pressure corresponding to human back pressure.

  A conventionally known aqueous liquid containing bag having a mesh-like adjacent chamber corresponds to a body shape such as the back of the upper body of a person who sits on a chair and leans on the backrest part thereof, and further, back pressure based on the posture change of the person There is a problem that body pressure cannot be dispersed by following the change of the body easily. In such a case, a cushion for a backrest that can effectively perform the body pressure dispersion function has been expected.

The present invention has been made in view of such circumstances, and smoothly follow the change in the attitude of the preferred Rikakaru who corresponds to the upper body of the type of person, between adjacent regions (liquid-filled cubicle A cushion for a backrest or the like that can allow the fluid to flow in or out, and to disperse the body pressure well in accordance with changes in the back pressure of the person by the inflow or outflow of the liquid, and the backrest of the chair An object of the present invention is to provide a cushion with a built-in liquid for a backrest, etc. , in which the filled liquid does not excessively move downward and swell even when disposed on an inclined surface or vertical surface such as a part. Is.

The invention described in claim 1 is a liquid storage chamber (hereinafter also referred to as “long cell”) surrounded and sealed by a peripheral fusion part formed by fusing a pair of superposed synthetic resin sheets. A plurality of orifices in which a plurality of fusion weir portions and a liquid flow path are narrowed in a region in a peripheral fusion portion thereof and formed by fusion of the synthetic resin sheet. A plurality of liquid-accommodating chambers formed by the section, and arranged to be used on an inclined surface or a vertical surface, and each liquid-accommodating chamber in the long cell is filled with liquid respectively. When the liquid flows out or flows in through each orifice part of the liquid storage chamber of the long cell, the inflow or outflow of the liquid is controlled, and the liquid in the long cell is Mainly flows easily in the horizontal direction (longitudinal direction), and the liquid moves vertically Is configured to be moved by the flow being controlled between the liquid storage cubicle which is location, and the first fusion Chakuseki portion of bottom in the region of the peripheral edge fused portion that forms the liquid storage chamber, A large number of fusion dam portions are provided, each of which includes a second fusion dam portion at the center, an upper third fusion dam portion formed in pairs on the upper left and right sides, and an upper fourth fusion dam portion. 4 to 20 portions are formed, and 4 to 10 liquid storage chambers filled with the liquid are formed, and the liquid in the liquid storage chamber can easily flow mainly in the horizontal direction, It is characterized in that the liquid can flow and move between liquid storage chambers arranged vertically . The interval between the orifice portions is preferably 0.5 to 5 cm (particularly preferably 1 to 3 cm) in order to allow the liquid to flow out or inflow so as to follow a change in the human body position.

  According to a second aspect of the present invention, the cushion with a built-in liquid having the long cell is inclined such as a backrest of a chair standing up at an angle of 30 to 90 ° (preferably 40 to 90 °) with respect to a horizontal plane. The cushion with a built-in liquid for a backrest or the like according to claim 1, wherein the cushion is used by being disposed on a surface or a vertical surface.

  According to a third aspect of the present invention, in the long cell, the peripheral fusion part is composed of an upper peripheral fusion part, a protruding arc-shaped peripheral fusion part at the left and right ends, and a lower peripheral fusion part. The vertical distance between the peripheral fusion part and the lower peripheral fusion part is in the range of 5 to 25 cm (preferably 5 to 15 cm), and the lateral distance of the projecting arc-shaped peripheral fusion part to the left and right ends is The cushion with a built-in liquid for a backrest or the like according to claim 1, wherein the cushion is within a range of 2 to 6 times (preferably 2.5 to 5 times) of the vertical distance of the backrest.

According to a fourth aspect of the present invention, the lower first fusion dam portion in the region of the peripheral fusion portion of the long cell is fused and formed as a pair of left and right arc-shaped dam portions protruding downward. The narrowest portion between the lower peripheral fusion portion and the first fusion dam is within a range of 1/10 to 1/4 of the vertical width of the long cell, and The liquid built-in type for a backrest or the like according to claim 3 , wherein left and right tip portions of one fusion weir portion (a pair of arc-shaped weir portions) reach the vicinity of the central portion of the width in the vertical direction of the long cell. cushion.

According to a fifth aspect of the present invention, in the region of the peripheral fusion portion of the long cell, the second fusion weir portion at the center is a long cell upward from the central portion of the lower first fusion weir portion. The gap between the upper tip of the second fusion weir portion and the upper peripheral fusion portion is 1/10 of the vertical width of the long cell. The cushion with a built-in liquid for a backrest or the like according to claim 3 or 4, wherein the cushion is within a range of ~ 1/4.

In the invention according to claim 6, the third fusion dam portion and the fourth fusion dam portion on the upper left and right in the region of the peripheral fusion portion of the long cell are the first fusion dam portion ( A pair of arc-shaped weir portions) is melted and formed as an arc-shaped weir portion from the vicinity of the central portion between the tip portion of the pair of arc-shaped weir portions and the upper peripheral edge fused portion along the protruding arc-shaped peripheral edge fused portions at the left and right tips of the long cell. The cushion with a built-in liquid for backrest or the like according to claim 4 or 5.

According to a seventh aspect of the present invention, in the liquid built-in cushion, a plurality of long cells filled with liquid are arranged vertically in parallel with the longitudinal direction, or the liquid is filled with liquid. The cushion with a built-in liquid for a backrest or the like according to claim 1, wherein a plurality of cushion members each having a long cell are arranged vertically connected in parallel in the longitudinal direction.

If the cushion with a built-in liquid for backrest according to the first invention (inventions 1 to 7 ) is used, the liquid is prevented from excessively gathering and swelling under the long cell due to gravity. It can be suitably used by being installed on an inclined surface such as the backrest of the chair described above, and can effectively exert a body pressure dispersion effect.

  According to a first aspect of the present invention, as described in claim 3, in the long cell, the peripheral fusion portion is an upper peripheral fusion portion, a protruding arc-shaped peripheral fusion portion at the left and right ends, and a lower peripheral fusion portion. The upper and lower gaps between the upper and lower peripheral edge fused portions are within a range of 10 to 25 cm (preferably 10 to 20 cm), and the protruding arc-shaped peripheral edge to the left and right end portions The backrest or the like according to claim 1, wherein a left-right distance of the fusion part is in a range of 1.5 to 3.5 times (preferably 2.0 to 3.0 times) the vertical distance. With this liquid built-in type cushion, the liquid in the long cell can mainly flow suitably in the horizontal direction, so that the body pressure dispersion effect that follows the change in the posture of the person can be achieved quite suitably. In the long cell, it is optimal that the left-right distance in the long direction (horizontal direction) is 20 to 80 cm (particularly about 25 to 60 cm).

  In the present invention, the liquid built-in cushion is mainly used by being disposed on a backrest (an inclined surface or a vertical surface) of a chair. In the present invention, the back portion of the chair refers to a part or the whole of a portion where a person's shoulder (near the scapula) contacts the waist (near the sacrum) when a person sits on the chair and leans on the chair. Say. Therefore, the liquid built-in cushion according to the present invention can be used not only for the entire back portion of the chair, but also for shoulder rest and waist support. What is necessary is just to have 1 to 2 long cells.

  The cushion with a built-in liquid according to the present invention is a back-raised portion of an electric bed (forms an inclined surface) in an electric gatchet bed having a “gage-up function” (back-up function) for raising the upper body. It is also possible to arrange and use the back part from the shoulder part of the person to the waist part partly or entirely. As described above, the cushion with a built-in liquid according to the present invention can be provided on an inclined surface or a vertical surface of various welfare equipment in which a person leans on for a long time.

  The liquid built-in cushion according to the first invention of the present application is a long liquid storage chamber (long cell) extending in the horizontal direction even when disposed on an inclined surface or vertical surface such as a backrest portion of a chair or the like. So that the liquid that is filled does not remarkably gather at the bottom of the long cell due to gravity, making it difficult to distribute the body pressure effectively. When sitting on a chair and leaning on the backrest, the liquid in each long cell flows mainly in the horizontal direction and smoothly exists in the inner region of each long cell, following the person's posture change smoothly. Since the liquid can flow in and out through the orifice portion between the upper and lower adjacent liquid storage small chambers, the liquid can also flow up and down. By change Following the change in back pressure, an effect that can be better pressure dispersion.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIG. 1, the cushion 3 with a built-in liquid for backrest according to the embodiment of the present invention has, for example, a backrest 1a (preferably 30 to 90 °, particularly preferably 40) of a chair 1 on which a person can sit. ˜90 °) on an inclined surface or a vertical surface via an appropriate lower elastic material, for example, a lower elastic material (molded urethane, etc.) provided on the inclined portion of the backrest 1a. 2 is provided with a liquid built-in cushion 3 molded from a flexible synthetic resin sheet, on which an upper elastic material (molded urethane, etc.) 4 and a covering material (woven fabric, non-woven fabric, cotton cloth built-in bag) Etc.) which can be used after being coated with 5.

  As shown in FIG. 2, the liquid built-in cushion 3 extends, for example, in the horizontal direction of the backrest portion 1a (the left-right direction in FIG. 2), and in the lower part of the long cell, the first melt is provided. The landing dam 7c, the second fusion dam 7a in the vertical direction of the approximate center of the long cell, and the pair of third fusion dam 7b and the fourth fusion dam 7b are formed in the upper part of the long cell, respectively. It is preferable that the long cells (3a to 3d) are arranged side by side so as to be parallel to the left-right direction (horizontal direction) corresponding to the backrest portion 1a.

  The first invention of the present application is not limited to the liquid built-in cushion described in FIG. 2, but is a single long cell filled with liquid, or preferably a long cell. A cushion with a built-in liquid in which 2 to 10 pieces, particularly preferably 3 to 6 pieces are arranged in parallel vertically may be used. As shown in FIG. 2, the long cell in which the liquid is incorporated in the peripheral fusion portion of the liquid-embedded cushion of the present invention has an upper peripheral fusion portion in the peripheral fusion portion. It is sufficient that the lower peripheral sealing portion and the lower peripheral sealing portion are formed in parallel straight lines. However, if necessary, for example, the upper peripheral fusion portion and the lower peripheral fusion portion have an arc shape protruding downward. Even if it is, it may be preferable because the liquid easily flows upward. In addition, while the code | symbol 1b in FIG. 1 has shown the leg part 1b of the chair 1, the code | symbols 2, 4, 5, and 6 are each the lower elastic material (molding) arrange | positioned at the backrest part 1a of the chair 1. 2), upper elastic material (upper urethane, etc.) 4, covering material (covered woven fabric, leather, etc.) 5, and reference numeral 6 denotes a seat surface 6 of the chair 1.

  As shown in FIG. 2, the cushion with a built-in liquid according to the first invention of the present application can be extended, for example, in the width direction (horizontal direction) of the back portion 1a of the chair, and is an abbreviation of a long cell. The second fusion dam 7a in the central vertical direction, the first fusion dam 7c at the lower part of the long cell, and the third and fourth fusion dams 7b and 7b at the upper part of the long cell. Since the plurality of long cells 3a to 3d are arranged in the vertical direction corresponding to the backrest part, the person sits on the chair and leans against the backrest part so that the person In order to smoothly and reliably follow even if the posture changes, liquid flows in or out between adjacent areas (between the liquid storage compartments), and changes in the back pressure of the person due to the inflow or outflow of the liquid The body pressure can be dispersed more favorably.

  In the liquid built-in cushion according to the first invention of the present application, as shown in FIG. In the lower liquid storage chambers (I) and (II), the vertical dimension of the liquid storage chamber is smaller than in the upper liquid storage chambers (III) and (IV). However, it is possible to prevent the liquid from being excessively accumulated in the lower part of the long cell due to the gravity of the filled liquid due to its own weight.

  The liquid built-in cushion according to the first invention of the present application is an arc-shaped projection in which the fusion weir portion of the long cell protrudes downward so as to suppress the flow of the liquid in the lower direction of each liquid containing small chamber. The formation of the fusion weir part suppresses the influence of gravity when the liquid flows following the posture change of the person sitting on the chair and leaning on the backrest part, and the upward flow and the lower part This is preferable because the flow in the direction can be substantially balanced.

As shown in FIGS. 27 and 28, the cushion with a built-in liquid according to the reference example corresponds to the backrest portion 1a, and is an annular long cell 7a ′ or 7a ″ that accommodates liquid while extending in an annular shape. In each annular long cell 7a ′ or 7a ″, the lower inner diameter of the annular long cell positioned corresponding to the lower portion of the backrest portion is at the upper part. It is formed smaller than the inner diameter of the lower part of the annular long cell positioned to avoid excessive accumulation of liquid in the lower part of the liquid built-in cushion 3 ′ or 3 ″ due to the weight of the liquid due to gravity. This is preferable because it is possible.

  The liquid built-in cushion 3 according to the first invention of the present application is, as shown in FIG. 2, for example, long liquid storage chambers (long cells) 3 a, 3 b, 3 c that can enclose liquid in a flowable manner. 3d, a fusion weir section (7a-7c) that divides the long cell into an area of an arbitrary size (liquid storage small room), and a posture change of a person sitting on a chair and leaning on the backrest section Then, the liquid is allowed to flow in or out between the areas divided by the weir portions (7a to 7c) (between the liquid containing small rooms), and the inflow or outflow of the liquid is controlled while following the change in the posture of the person. Thus, an orifice portion (a portion for controlling the flow of liquid between the liquid containing small chambers divided by a large number of fusion weir portions) that can disperse changes in the back pressure of the person is formed. .

  As shown in FIG. 2, the liquid-embedded cushion 3 is formed by, for example, thermally fusing two upper and lower flexible synthetic resin sheets to form a long liquid storage chamber containing liquid inside. It has long cells 3a to 3d ”. The material of the liquid built-in cushion 3 is rich in elasticity and has a predetermined durability and flexibility, so that the liquid does not permeate substantially in a short time and seals the liquid for a predetermined period. For example, a thermoplastic resin sheet such as ethylene-vinyl acetate copolymer (EVA), polyethylene, and polyvinyl chloride can be suitably used.

Thus, each of the long cells 3a to 3d of the liquid built-in cushion 3 is sealed with a continuous peripheral fusion portion in which the peripheral portion of each long cell is fused, and the long liquid is accommodated. It is preferable that the liquid is held in the chamber (long cell) so as to be able to flow and can be sealed for a long time.
The synthetic resin sheet constituting the long cell preferably has a thickness of 200 to 2000 μm, particularly 400 to 1000 μm, and particularly 20 to 80% (further 30 to 60%) of vinyl acetate units. A synthetic resin sheet having a thickness of 200 to 1500 μm (particularly a thickness of 400 to 1000 μm) made of an ethylene-vinyl acetate copolymer containing

  The liquid contained in each of the long cells (3a to 3d) of the liquid built-in cushion 3 according to the present invention may be a fluid liquid having a viscosity of 1 to 5000 centipoise (cp), particularly 10 to 2000 cp at room temperature. What is necessary is just to consist of water or the aqueous solution of a polyhydric alcohol (especially the liquid mixture obtained by mixing water, propylene glycol, etc.), for example.

  In the present invention, if the liquid filling the long cell is water, a cushion for a backrest can be manufactured at a lower cost. However, the liquid filled in the long cell is a mixed liquid of water and a polyhydric alcohol. Then, it is possible to prevent the liquid from freezing in the long cell of the liquid built-in cushion 3, and even if it is used for a long period of time, it passes through the synthetic resin sheet forming the long cell. This is preferable because it can be prevented from spreading to the outside. In the present invention, the liquid contained in the long cell may be water only (including those containing a small amount of additives) or only polyhydric alcohol.

  The fusion dams (7a to 7c) in the long cell divide the long cell of the liquid built-in cushion 3 into a region (liquid accommodating small room) of an arbitrary size. It is formed by thermally fusing two synthetic resin sheets constituting the mold cushion 3 at an arbitrary position.

  Among the above-mentioned fusion dams, the second fusion dam 7a at the center of the long cell extends in the vertical direction at the substantially central part of each of the long cells (3a to 3d) in the liquid built-in cushion 3. It extends along the spine of the person leaning against the backrest 1a. Thus, the end of the second fusion dam portion 7a at the center is formed away from the peripheral edge of the long cell of the liquid built-in cushion 3 and other fusion dam portions. An orifice part through which the liquid can flow is formed. The orifice part preferably has a narrowness of about 0.5 to 2 cm.

  Further, the third fusion dam portion and the fourth fusion dam portion 7b are formed in an arc shape protruding upward so as to suppress the flow of the liquid in the lower direction and promote the flow to the upper portion in the long cell. It is preferable that left and right pairs are formed in each of the long cells 7a to 7d. Thus, the ends of the fusion dams 7b are formed away from the peripheral fusion part of the long cell of the liquid built-in cushion 3 and the other dams, so that the liquid is at the separation part. An orifice portion that can flow is configured.

  Further, the first fusion dam 7c divides the long cell in the vertical direction, and the liquid storage chamber, which is an area divided by the first fusion dam 7c, is located below the backrest 1a. The lower liquid storage chamber (I) or (II) is formed with a smaller vertical spacing than the upper liquid storage chamber (III) or (IV) positioned at the upper portion. Thus, the end portion of the first fusion dam portion 7c is formed away from the peripheral fusion portion of the long cell of the liquid built-in cushion 3 and other fusion dam portions. Thus, an orifice portion through which the liquid can flow is configured.

  As described above, the orifice portion follows the change in the posture of the person sitting on the chair 1 and leaning on the backrest portion 1a, and allows the liquid to flow between the liquid-accommodating small rooms divided by the fusion weir portions 7a to 7c. Alternatively, the body pressure can be dispersed by following the change in the back pressure of the person by the inflow or outflow of the liquid. That is, when the posture of a person sitting on the chair 1 and leaning on the backrest part 1a changes, the liquid flows (inflow or outflow) through the orifice part in order to disperse the body pressure according to the change in the backpressure of the person generated accordingly. is there.

  According to the above-described embodiment, the liquid is allowed to flow in or out between the adjacent liquid-accommodating small chambers following the posture change of the person sitting on the chair 1 and leaning on the backrest portion 1a, and the liquid flows in or out. Thus, the change in the back pressure of the person can be well dispersed. Further, the liquid built-in cushion 3 extends in the horizontal direction of the backrest portion 1a, and has a length obtained by extending a fusion weir portion (a fusion weir portion 7a in the central portion) in the vertical direction of the substantially central portion. Since the plurality of scale cells 3a to 3d are arranged side by side in the vertical direction of the backrest portion 1a, it is adjacent to the person who sits on the chair 1 and leans on the backrest portion 1a in the horizontal direction. It is possible to cause the liquid to flow in or out between the liquid-accommodating small chambers, and to better disperse changes in the back pressure of the person due to the inflow or outflow of the liquid.

  Furthermore, the liquid storage compartment divided by the first fusion dam portion (specifically, the first fusion dam portion 7c) is located at the lower portion of the backrest portion 1a than the liquid storage compartment at the upper portion. In addition, since the vertical dimension is small, it is possible to avoid excessive accumulation of liquid in the lower portion of each of the long cells 3a to 3d of the built-in liquid cushion 3 due to the gravity of the liquid. Further, the fusion dam part (specifically, the fusion dam part 7b) protrudes downward so as to suppress the flow of the liquid in the lower direction and promote the flow in the upper direction in the long cell, and has an arc shape. Therefore, when the liquid flows following the posture change of the person sitting on the chair 1 and leaning on the backrest 1a, the influence of gravity is suppressed, and the flow in the upper direction and the lower direction are reduced. The flow can be approximately balanced.

  Furthermore, according to the present embodiment, when a person leaning on the backrest 1a shakes or twists to the left or right to change the posture of the person, the pressure on one side of the back increases and the liquid moves to the opposite side, The other side, back, waist, etc. will be pressed. Thus, it is possible to increase the sense of stability when leaning on the backrest, and to give the user a feeling that cannot be obtained with a conventional water mat or the like.

Next, in order to prove the technical superiority of the present invention, experimental results of the examples will be described.
(Experiment 1)
A pressure sensor that can measure back pressure is placed on the back of the chair, and the back pressure distribution when the subjects 1 and 2 are seated on a chair having a back that is supported up to the head and leans against the back. And the change of back pressure was measured.
As a condition at the time of measuring the back pressure, a cushion with built-in liquid for backrest 3 as shown in FIG. 2 is disposed in the backrest (Example 1), and the backrest has a liquid built-in cushion for backrest and urethane. (Example 2), and a backrest with no built-in liquid cushion for backrest and urethane (comparative example). The experimental results are shown in FIGS. 3, 4, and 5 in order to compare the maximum values of the respective back pressures by changing the angle of the back portion of the chair to 100 °, 110 °, and 130 °. 4 and 5, the reduction rate was calculated by the following calculation formula.

  Decrease rate = {(maximum back pressure when neither a cushion with built-in liquid for backrest nor urethane is provided) − (urethane only on cushion with built-in liquid for backrest or liquid built-in cushion for backrest Maximum back pressure in case of)} / (Maximum back pressure when neither liquid cushion for backrest nor urethane is provided)

Subject 1 is male 24 years old, height 180 (cm), weight 58.5 (kg), BMI index 18.0, subject 2 is male 65 years old, height 166 (cm), weight 72.0 (kg) ), BMI index 26.1.
In the liquid built-in type cushion used in Experiment 1, the liquid filled in the long cell is a mixed liquid (antifreeze) of water-propylene glycol containing 40% by volume of propylene glycol. The synthetic resin sheet is 500 μm in thickness, and is a three-layer laminate of polyethylene, ethylene-vinyl acetate copolymer, and polyethylene.
In the liquid built-in cushion, as shown in FIG. 2, the vertical distance between the long cells is 10 cm, and the horizontal distance between the long cells is downward from the upper long cell. Four long cells of 44 cm, 41 cm, 37 cm, and 34 cm are arranged in parallel in this order. The urethane used with the long cell had a thickness of 10 (mm).

  As apparent from the experimental results of FIGS. 3, 4, and 5, it is clear that the maximum value of the back pressure is lower overall in Examples 1 and 2 than in the comparative example. Follows the posture change of a person leaning on the backrest, and allows the liquid to flow in or out between adjacent areas (between the liquid containing small chambers), and in accordance with the change in the back pressure of the person due to the inflow or outflow of the liquid It has been demonstrated that it can be dispersed in

Further, the distribution of the back pressure applied to the backrest portion is shown in FIGS.
Specifically, in FIGS. 6 to 8, when the angle of the backrest portion is 100 ° and the subject 1 leans against the backrest portion (the case where neither the liquid built-in cushion for backrest nor urethane is provided). FIG. 6 shows the distribution of back pressure in the case of FIG. 7 in the case of only the cushion with built-in liquid for the backrest, and FIG. 8) in the case of putting urethane on the liquid-incorporated cushion for the backrest.

  9 to 11 show the case where the angle of the backrest part is 110 ° and the subject 1 leans on the backrest part (the case where neither the liquid built-in cushion for cushioning nor urethane is provided is shown in FIG. 9). FIG. 10 shows the distribution of the back pressure in FIG. 10 when only the liquid built-in cushion is used, and FIG. 11) shows the case where urethane is placed on the liquid built-in cushion for the backrest.

  FIGS. 12 to 14 show the case where the angle of the backrest part is 130 ° and the subject 1 leans on the backrest part (the case where neither the liquid built-in cushion for cushioning nor urethane is provided is shown in FIG. FIG. 13 shows the case of only the liquid built-in type cushion, and FIG. 14) shows the distribution of the back pressure when urethane is placed on the liquid built-in type cushion for the backrest.

  Similarly, FIGS. 15 to 17 show a case where the angle of the backrest portion is 100 ° and the subject 2 leans against the backrest portion (in the case where neither the liquid built-in cushion for backrest nor urethane is provided). FIG. 16 shows the distribution of back pressure in the case of only the cushion with built-in liquid for the backrest, and FIG. 17) shows the case of placing urethane on the cushion with the built-in liquid for the backrest.

  18 to 20 show the case where the angle of the backrest part is 110 ° and the subject 2 leans against the backrest part (the case where neither the liquid built-in cushion for cushioning nor urethane is arranged is used for the backrest shown in FIG. 19 shows the back pressure distribution of FIG. 19 when only the liquid built-in cushion is used, and FIG. 20) shows the case where urethane is placed on the liquid cushion for backrest.

  21 to 23 show a case where the angle of the backrest part is 130 ° and the subject 2 leans against the backrest part (the case where neither the liquid built-in cushion for cushioning nor urethane is provided is used for the backrest shown in FIG. FIG. 22 shows the distribution of the back pressure in FIG. 22 when only the liquid built-in cushion is used, and FIG. 23) shows the case where urethane is placed on the liquid built-in cushion for the backrest.

(Experiment 2)
As shown in FIG. 24, the backrest liquid built-in cushion A (Example) in which the fusion dam Aa at the center of the long cell is formed largely above and below the substantially center of the liquid built-in cushion, and the center And a liquid built-in cushion B (Example) for the backrest in which the fusion dam portion Ba of the portion is formed to be relatively small.
And while applying compressive force repeatedly to the one side which pinched | interposed the liquid built-in type cushion in which the elongate cell which has the fusion | melting weir parts Aa and Ba was formed, the change of the pressure of the other side at that time was measured.
In addition, although the specific frequency regarding the liquid movement in the liquid built-in cushion B for the backrest is confirmed to be 2 to 3 Hz depending on the experimental conditions, the repetition frequency of the compressive force to be applied is 2 Hz. did.

  As is apparent from the experimental results of FIGS. 25 and 26, it can be seen that the liquid cushion for backrest B is sensitive to repeated compression force frequencies. On the other hand, it is understood that the pressure fluctuation is small in the backrest built-in cushion A as an example. That is, when sensitively responding to changes in back pressure, the stability of the back is reduced and the liquid tremor tends to be sensuously bad for humans. On the other hand, if the change in the back pressure is small, the vibration of the liquid is so small that it quickly attenuates. In the present invention, the liquid built-in cushion for the backrest always wraps the back and is considered to improve stability.

As a reference example , for example, as shown in FIG. 27, a plurality of annular cells (3′a to 3′c) that are annularly accommodated and accommodate liquid while adjoining the backrest portion 1a are arranged on the spiral. Each of the annular cells (3′a to 3′c) is provided with a liquid built-in cushion 3 ′ having a smaller inner diameter at the lower portion of the backrest portion 1a than at the upper portion. It is good also as what you did.

  In the center of the annular cell (3′a to 3′c) of the cushion 3 ′ with a built-in liquid, a cell 3′d having another shape is disposed. These annular cells (3′a to 3 ′) c) and the cell 3'd in the central part are independently filled with liquid. Further, each annular cell (3′a to 3′d) has a central fusion dam portion 7a ′ extending in the vertical direction of the central portion, and a liquid downward direction, as in the previous embodiment. A fusion weir portion 7b ′ is formed that protrudes downward and has an arc shape so as to suppress flow.

  According to such a liquid built-in cushion for the backrest, the liquid built-in cushion 3 ′ spirals around the annular cells (3′a to 3′c) containing the liquid while extending in a ring shape corresponding to the backrest portion 1a. Since the portion located in the lower part of the backrest part 1a in each annular cell (3′a to 3′c) is formed to have a smaller inner diameter than the part located in the upper part. It is possible to avoid excessive accumulation of liquid in the lower part of the annular cell of the liquid-containing cushion body 3 ′ due to the weight of the liquid due to gravity.

Furthermore, as another reference example, as shown in FIG. 28, for example, a plurality of annular cells (3 ″ a to 3 ″ c) containing a liquid while extending in an annular shape corresponding to the backrest portion 1a are spirally adjacent to each other. In each annular cell (3 ″ a to 3 ″ c), a portion of the annular seat (3 ″ a-3 ″ c) located at the lower portion of the backrest portion 1a has a liquid built-in cushion 3 ″ formed with a smaller inner diameter than the portion located at the upper portion. It may be provided.

  Another shaped cell 3 ″ d is disposed at the center of the annular cell (3 ″ a to 3 ″ c) of the liquid-containing cushion 3 ″, and these annular cells (3 ″ a to 3 ″) are arranged. c) and the central cell 3 "d are independently filled with liquid. Also, each annular cell (3" a to 3 "d) has a central cell as in the previous embodiment. A fusion dam portion 7b "formed in an arc shape is formed so that the central fusion dam portion 7a" extending in the vertical direction protrudes downward so as to suppress the flow of the liquid in the lower direction.

  According to such a liquid built-in cushion for the backrest, the liquid built-in cushion 3 ″ spirals around the annular cells (3 ″ a to 3 ″ c) containing the liquid while extending in a ring shape corresponding to the backrest portion 1a. Since the part located in the lower part of the backrest part 1a in each annular cell (3 "a-3" c) is formed to have a smaller inner diameter than the part located in the upper part. It is possible to avoid excessive accumulation of liquid in the lower part of the annular cell of the liquid built-in cushion 3 ″ due to its own weight due to the gravity of the liquid.

One or more liquid storage chambers are enclosed and sealed by a peripheral fusion portion formed by fusing a pair of superimposed synthetic resin sheets, and the liquid storage chamber is formed in a region within the peripheral fusion portion. It has a plurality of liquid-accommodating chambers formed by a plurality of fusion weir portions formed by fusion of the synthetic resin sheet and a large number of orifice portions where the liquid flow passages are narrowed. Each of the liquid storage chambers in the liquid storage chamber is filled and communicated with each other, and the liquid passes through each orifice portion of the liquid storage chamber of the liquid storage chamber. The inflow or outflow of liquid is controlled at the time of outflow or inflow, and the liquid in the liquid storage chamber easily flows mainly in the horizontal direction. Can move and move between them In the region of the peripheral fusion part that is configured and forms the liquid storage chamber, a lower first fusion dam part, a second fusion dam part in the center part, and a pair on the left and right of the upper part are formed. A large number of fusion weir parts, each consisting of an upper third fusion weir part and an upper fourth fusion weir part, are provided at four to twenty locations and filled with liquid. 4 to 10 liquid storage chambers are formed, and the liquid in the liquid storage chamber can flow easily mainly in the horizontal direction, and the backrest can also flow and move between the liquid storage chambers arranged above and below. If it is a liquid built-in type cushion for use, etc., it can be applied to ones with different external shapes or with other functions added.

The cross-sectional schematic diagram which shows the chair with which the liquid built-in type cushion for backrests based on embodiment of this invention was applied. Overall schematic diagram showing a cushion with built-in liquid for the backrest Graph of experimental results (maximum back pressure) showing the technical superiority of the cushion with built-in liquid for the backrest Table of test results (maximum back pressure) showing the technical superiority of the cushion with built-in liquid for the backrest (subject 1) Table of test results (maximum back pressure) showing the technical superiority of the cushion with built-in liquid for the backrest (subject 2) When the backrest is set to 100 °, the back pressure distribution when the subject 1 leans against the backrest without the liquid-incorporated cushion and urethane. When the backrest is 100 °, the back pressure distribution when the subject 1 leans against the backrest with only the liquid built-in cushion. When the backrest is set to 100 °, the back pressure distribution when subject 1 leans against the backrest with urethane on the liquid built-in cushion When the backrest is set to 110 °, the back pressure distribution when the subject 1 leans against the backrest without the liquid built-in cushion and urethane. When the backrest is set to 110 °, the back pressure distribution when the subject 1 leans against the backrest of only the liquid built-in cushion When the backrest is set to 110 °, the back pressure distribution when subject 1 leans against the backrest with urethane on the liquid built-in cushion When the backrest is set to 130 °, the back pressure distribution when the subject 1 leans against the backrest without the liquid built-in cushion and urethane. When the backrest is 130 °, the back pressure distribution when the subject 1 leans against the backrest where only the liquid built-in cushion is disposed. Back pressure distribution when subject 1 leans against backrest with urethane on liquid built-in cushion when backrest is 130 ° Back pressure distribution when subject 2 leans against backrest without liquid built-in cushion and urethane when backrest is 100 ° When the backrest is set to 100 °, the back pressure distribution when the subject 2 leans against the backrest where only the liquid built-in cushion is disposed. When the backrest is set to 100 °, the back pressure distribution when subject 2 leans against the backrest with urethane on the liquid-containing cushion Back pressure distribution when subject 2 leans against backrest part where liquid built-in cushion and urethane are not arranged when backrest part is 110 ° When the backrest is set to 110 °, the back pressure distribution when the subject 2 leans against the backrest where only the liquid built-in cushion is disposed. When the backrest is set to 110 °, the back pressure distribution when subject 2 leans against the backrest with urethane on the liquid built-in cushion Back pressure distribution when subject 2 leans against backrest part where liquid built-in cushion and urethane are not arranged when backrest part is 130 ° Back pressure distribution when subject 2 leans against the backrest of only the liquid built-in cushion when the backrest is 130 ° Back pressure distribution when subject 2 leans against backrest with urethane placed on backrest cushion when backrest is 130 ° Applied in experiments showing the technical superiority of the cushion for backrest (a) Example (b) Overall schematic diagram of another example The graph which shows the pressure change in an Example The graph which shows the pressure change in other Examples Overall schematic diagram showing a liquid built-in cushion according to a reference example Overall schematic diagram showing a cushion with a built-in liquid according to another reference example

Explanation of symbols

1 Chair 1a Backrest 2 Lower urethane (molded urethane)
3, 3 ′, 3 ″ cushion with built-in liquid 3a-3d long cell 3′a-3′d, 3 ″ a-3 ″ d annular cell 4 upper urethane 5 covering material 6 seating surface 7a, 7a ′, 7a ″ 2nd fusion dam part 7b, 7b ', 7b "of a center part The 3rd fusion dam part 7c of a right-and-left upper part The 1st fusion dam part of a lower part (I), (II) The lower liquid accommodation small room (III) (IV) Upper liquid chamber

Claims (7)

  One or more liquid storage chambers are enclosed and sealed by a peripheral fusion portion formed by fusing a pair of superimposed synthetic resin sheets, and the liquid storage chamber is formed in a region within the peripheral fusion portion. It has a plurality of liquid-accommodating chambers formed by a plurality of fusion weir portions formed by fusion of the synthetic resin sheet and a large number of orifice portions where the liquid flow passages are narrowed. Each of the liquid storage chambers in the liquid storage chamber is filled and communicated with each other, and the liquid passes through each orifice portion of the liquid storage chamber of the liquid storage chamber. The inflow or outflow of liquid is controlled at the time of outflow or inflow, and the liquid in the liquid storage chamber easily flows mainly in the horizontal direction. Can move and move between them In the region of the peripheral fusion part that is configured and forms the liquid storage chamber, a lower first fusion dam part, a second fusion dam part in the center part, and a pair on the left and right of the upper part are formed. A large number of fusion weir parts, each consisting of an upper third fusion weir part and an upper fourth fusion weir part, are provided at four to twenty locations and filled with liquid. 4 to 10 liquid storage chambers are formed, the liquid in the liquid storage chamber can flow easily in the horizontal direction, and the liquid can flow and move between the liquid storage chambers arranged vertically. Cushion with built-in liquid for backrest, etc.   The liquid built-in type cushion having the liquid storage chamber is used by being disposed on an inclined surface or a vertical surface such as a backrest of a chair standing up at an angle of 30 to 90 ° with respect to a horizontal plane. Item 2. A cushion with a built-in liquid for backrest or the like according to item 1.   In the liquid storage chamber, the peripheral fusion part is composed of an upper peripheral fusion part, a protruding arc-shaped peripheral fusion part at the left and right ends, and a lower peripheral fusion part, and the upper peripheral fusion part and the lower peripheral fusion part. The vertical distance from the wearing part is in the range of 5 to 25 cm, and the horizontal distance of the protruding arc-shaped peripheral edge fused part to the left and right ends is in the range of 2 to 6 times the vertical distance. A cushion with a built-in liquid for backrest or the like according to 1. The lower first fusion dam portion in the region of the peripheral fusion portion of the liquid storage chamber is fused and formed as a pair of left and right arc-shaped dam portions protruding downward, and the lower peripheral rim described above The narrowest part between the fusion part and the first fusion dam part is within a range of 1/10 to 1/4 of the width in the vertical direction of the liquid storage chamber, The cushion with a built-in liquid for a backrest or the like according to claim 3 , wherein the front end portion reaches the vicinity of a central portion of a width in a vertical direction of the liquid storage chamber. The second fusion dam part at the center in the region of the peripheral fusion part of the liquid storage chamber is close to the upper peripheral fusion part of the liquid storage chamber upward from the central part of the lower first fusion dam part. The distance between the upper tip of the second fusion weir portion and the upper peripheral fusion portion is within the range of 1/10 to 1/4 of the vertical width of the liquid storage chamber. A cushion with a built-in liquid for a backrest or the like according to claim 3 or 4. The upper left and right third fusion dam portions and the fourth fusion dam portion in the region of the peripheral fusion portion of the liquid storage chamber are the front end portion and the upper peripheral fusion portion of the first fusion dam portion in the liquid storage chamber. 6. The backrest or the like according to claim 4, which is melted and formed as an arc-shaped weir portion from the vicinity of the central portion to the projecting arc-shaped peripheral fused portion at the left and right ends of the liquid storage chamber. Built-in cushion.   The above-mentioned liquid built-in cushion is a cushion member having a plurality of liquid storage chambers that are filled with a liquid in a vertical direction parallel to the longitudinal direction, or a liquid storage chamber that is filled with a liquid. The cushion with a built-in liquid for backrests according to claim 1, wherein a plurality of are arranged in parallel in the longitudinal direction and connected together.

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