JP6015001B2 - mattress - Google Patents

Description

  The present invention relates to a mattress that is formed of a foamed molded article and that is particularly suitable for use in medical use or nursing care.

  When a person sleeps using a mattress, when he lies on his / her side or lies down on the mattress, the “ideal sleeping posture” is naturally secured by the elastic deformation of the mattress, and the good sleeping comfort derived from the sleeping posture is obtained. I want to have a high level of sleepiness or good sleep. Here, the ideal sleeping posture is said to be a posture that is as close as possible to the standing posture.

  Further, since the mattress has been used for a long period of time, there is little “sagging” even during such long-term use, and it is also required to have durability that can maintain an “ideal sleeping posture” for a long period of time.

  Furthermore, among mattresses, especially those used for medical purposes and nursing care, people often sleep on the mattress while maintaining the same sleeping posture for a long time, so concentration of body pressure on specific parts of the body From the viewpoint of preventing pressure ulcers (bed slippage) due to, it is required to have a good body pressure dispersion function.

  On the other hand, in mattresses used for such medical and nursing care, there is a universal demand for reducing the labor burden on nurses and caregivers in nursing work and nursing care work. It cannot be denied that considerations for the benefit of the mattress user, such as ensuring an ideal sleeping posture and suppressing body pressure concentration on a specific part of the body, are somewhat sacrificed.

  Conventionally, various proposals have been made as mattresses that can cope with various problems in such mattresses (see Patent Documents 1 to 4).

  In Patent Document 1, a mattress is formed with a natural rubber foam, and the depth of a hole (foaming cavity) formed in the foam by a foaming action is slightly changed in accordance with the magnitude of body pressure. On the other hand, a technique has been proposed in which excessive sinking of the mattress is suppressed, body pressure dispersion is promoted, and a pressure ulcer prevention effect is obtained.

  In Patent Document 2, in a mattress composed of a base portion made of a synthetic resin foam and a large number of protrusions erected on the base portion, the cross-sectional area of the base portion in the central portion in the longitudinal direction is set to the base portion in both longitudinal end portions. A technique has been proposed in which the mattress is adjusted to have a larger cross-sectional area, thereby adjusting the hardness of the mattress and preventing excessive sinking, thereby realizing a sleeplessness that does not burden the spine.

  In Patent Document 3, a mattress made of a soft foam, for example, a natural rubber foam, is provided with a number of holes in the thickness direction, and the repulsive force of the mattress is changed by changing the depth of the holes depending on the part. A technique has been proposed in which the repulsive force of the region that comes into contact with the lumbar region that is likely to sink is increased, thereby supporting the body appropriately and ensuring a sleeping posture with the back muscles extended.

  In Patent Document 4, in a mattress formed of a foam made of urethane resin, a plurality of holes are formed in the thickness direction, and the body pressure is supported by columns obtained by the formation of the holes. There has been proposed a technique for preventing pressure ulcer by causing a pillar to fall in the direction of hanging and releasing body pressure to the hole side.

  JP 2007-185235 A   JP 2000-93263 A   JP 2005-118097 A   JP 2001-25425 A

  However, in the mattress shown in Patent Document 1, the depth of the holes (foaming cavities) formed in the foam by the foaming action is slightly changed according to the magnitude of the body pressure, thereby dispersing the body pressure. Although the effect is to be enhanced, the management of the depth of the pores in the foam is extremely difficult and the feasibility is poor.

  In the mattress disclosed in Patent Document 2, the hardness of the mattress is adjusted by providing a difference between the cross-sectional area of the base portion in the center portion in the longitudinal direction of the mattress and the cross-sectional area of the base portion in both end portions in the longitudinal direction. Although the pressure dispersion action is enhanced, the bases are independent from each other and do not have a function of restraining the bases. However, the certainty of the body pressure dispersion effect by changing the originally assumed cross-sectional area of the base is impaired, and as a result, the intended purpose cannot be achieved.

  In addition, the mattress is made of a synthetic resin foam, and due to the properties of the synthetic resin foam, the compressive residual stress when the mattress is compressed is large, and “sagging” is likely to occur due to continued use. There is also a problem in durability.

  In the mattress shown in Patent Document 3, the depth of the hole provided in the mattress made of a natural rubber foam is determined according to the portion of the mattress (specifically, corresponding to the uneven shape of the human body in the state of lying on the mattress) The repulsive force of the mattress is changed by changing, but since the hole is provided only on the back surface side of the mattress, the degree of freedom of adjusting the repulsive force in the entire area of the mattress is low and sufficient body It is difficult to obtain a pressure dispersion action.

  In the mattress shown in Patent Document 4, body pressure is supported by a plurality of columns obtained by forming a plurality of holes in the thickness direction of the mattress, and the body pressure is released in the collapse direction of the columns. In this case, the action direction of the force is schematically shown (see FIGS. 3 and 12). However, in practice, the mattress is placed on the floor surface and the back surface thereof is maintained in a flat state. Therefore, when subjected to body pressure, the back surface of the mattress is constrained to be in a flat state and only the upper surface side thereof is retained. Will be deformed indentation along the body shape, and considering the deformed form of the mattress, there is doubt about the feasibility of the effect of “relieving body pressure in the direction of column collapse”.

  Therefore, in view of the above-mentioned problems of the prior art, the present invention aims to provide a mattress excellent in durability while ensuring both an ideal sleep posture and a good body pressure dispersion action. It was made.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

In the first invention of the present application, in the mattress composed of the foamed molded body 2 having a flat rectangular shape, one surface of the foamed molded body 2 is divided into at least three zones Z4, Z5, and Z6 in the longitudinal direction, and The first zone Z4 located near the center of the direction is shaped like a rhombus having a major axis or a minor axis in the longitudinal direction, and the elastic repulsion degree of each of the zones Z4, Z5, Z6 is given to the foam molded body 2 from the one surface. By setting the size and / or arrangement pattern of a large number of non-through holes 3, 4 and 5 provided so as to extend in the thickness direction, the first zone Z4 is high, and the first zone Z4 The second zone Z5 and the third zone Z6 located on both sides are adjusted so as to be lowered.

In the second invention of the present application, in the mattress composed of the flat elongated rectangular foam molded body 2, one surface 2a of the foam molded body 2 is partitioned into three zones Z1, Z2, and Z3 in the longitudinal direction. At the same time, the elastic resilience of the zones Z1, Z2, and Z3 is the size of the large number of non-through holes 3, 4, and 5 provided in the foamed molded body 2 so as to extend from the one surface in the thickness direction. By setting the height and / or the arrangement pattern, the first zone Z1 located near the center in the longitudinal direction is high, and the second zone Z2 and the third zone Z3 located on both sides of the first zone Z1 are both low. The other surface is divided into three zones Z4, Z5, and Z6 in the longitudinal direction, and the first zone Z4 located near the center in the longitudinal direction has a major axis or minor axis in the longitudinal direction. The diamond shape and shape On the other hand, the elastic resilience of each of the zones Z4, Z5, Z6 is that of a large number of non-through holes 3, 4, 5 provided in the foamed molded body 2 so as to extend in the thickness direction from the one surface. By setting the size and / or arrangement pattern, the first zone Z4 is adjusted to be high, and the second zone Z5 and the third zone Z6 located on both sides of the first zone Z4 are adjusted to be low. It is characterized by that.

In the third invention of the present application, in the mattress according to the first or second invention , the foamed molded body 2 is provided with a large number of non-through holes 3, 4 and 5 extending in the thickness direction, The elastic repulsion degree is adjusted by setting the size of the holes 3, 4, 5 and / or the arrangement pattern.

In the fourth invention of the present application, in the mattress according to the first, second or third invention , the surface of the foam molded body 2 is placed from one side in the longitudinal direction in a mounted state on the mattress mounting surface. It is characterized by inclining toward the other side.

The fifth invention of the present application is characterized in that , in the mattress according to the first, second, third or fourth invention , the foam molded body 2 is formed of a foam molded product of natural rubber.

  In the present invention, the following effects can be obtained.

(A) First invention of the present application According to the mattress according to the first invention of the present application, in the mattress constituted by the foamed molded body 2 having a plane-long rectangular shape, at least one surface of the foamed molded body 2 is arranged in the longitudinal direction. Are divided into three zones Z4, Z5, and Z6, and the first zone Z4 located near the center in the longitudinal direction has a rhombus shape having a major axis or a minor axis in the longitudinal direction, and each of the zones Z4, Z5, and Z6 By setting the size and / or arrangement pattern of a large number of non-through holes 3, 4 and 5 provided in the foamed molded body 2 so as to extend in the thickness direction from the one surface. Since the first zone Z4 is high and the second zone Z5 and the third zone Z6 located on both sides of the first zone Z4 are adjusted to be low, it is possible to adjust the body regardless of the sleeping posture. Body pressure collection at specific sites There is prevented by optimal pressure dispersion effect, with a high sleep resistance and sleep can be obtained, it is possible to provide a high pressure ulcer prevention effect mattress.

  That is, considering the person's sleeping posture, for example, as shown in FIG. 9, when a person 40 in a supine posture on the mattress 1 turns to the right or left and takes a lying posture (see reference numerals 40a and 40b). In addition, in the normal supine posture and the supine posture, the waist portion 43 and the hip portion 44 are located in the first zone Z4 of the rhombus set on the mattress 1 and are not separated from the first zone Z4. Absent. The shoulder 42 is located in the second zone Z5, and the arm 45 is located in the third zone Z6.

  FIG. 10 also shows various sleeping postures including a lying posture, and a body central axis in that case (shoulder portion 42 indicated by a white circle, waist portion 43 and hip portion 44 indicated by a black circle, and a hip portion 45 indicated by a black square. In any of these sleeping postures, the human waist 43 and buttocks 44 are located in the first zone Z4 of the rhombus, and the shoulder 42 is located in the second zone Z5. It can be seen that the flange 45 is located in the third zone Z6.

  Therefore, the lumbar part 43 and the heel part 44 that protrude most in the supine posture and the recumbent posture correspond to the first zone Z4 having a high degree of elastic resilience, thereby suppressing excessive subsidence in the lumbar part 43 and the heel part 44 part. Body pressure dispersion action is promoted. Further, the shoulder portion 42 that protrudes in the recumbent posture and causes the body center axis to be greatly deformed by stretching the shoulder portion 42 corresponds to the second zone Z5 having a low degree of elastic resilience, so that the shoulder portion 42 sinks appropriately. This suppresses deformation of the body central axis (deformation of the mattress 1 in the thickness direction). As a result, the effect of the headline, that is, the elastic resilience of each zone Z4, Z5, Z6, as in the present invention, is provided on the foamed molded body 2 so as to extend in the thickness direction from the one surface. By setting the size and / or arrangement pattern of the non-through holes 3, 4, and 5, the first zone Z4 is high, and the second zone Z5 and the third zone Z6 located on both sides of the first zone Z4. By adjusting so that both of them are low, concentration of body pressure to a specific part of the body is prevented regardless of the sleeping posture, and the optimal body pressure dispersion action provides high sleepiness / sleepiness, A mattress having a high pressure ulcer prevention effect can be provided.

(B) Second invention of the present application In the second invention of the present application, in the mattress composed of the foamed molded body 2 having a flat rectangular shape, one surface 2a of the foamed molded body 2 has three zones in its longitudinal direction. Z1, Z2, and Z3 are divided into a plurality of zones, and the elastic repulsion degree of each of the zones Z1, Z2, and Z3 is provided on the foamed molded body 2 so as to extend in the thickness direction from the one surface. By setting the size and / or arrangement pattern of the concave holes 3, 4, and 5, the first zone Z 1 located near the center in the longitudinal direction is high, and the second zone Z 2 located on both sides of the first zone Z 1 The third zone Z3 is adjusted so as to be lowered, and the other surface is partitioned into three zones Z4, Z5, Z6 in the longitudinal direction, and the first zone Z4 located near the center in the longitudinal direction is Long axis in the longitudinal direction or While having a rhombus shape with an axis, a large number of unpenetrated recesses provided so that the elastic repulsion degree of each of the zones Z4, Z5, and Z6 extends from the one surface to the thickness direction of the foamed molded body 2 By setting the size and / or arrangement pattern of the holes 3, 4, and 5, the first zone Z4 is high, and the second zone Z5 and the third zone Z6 located on both sides of the first zone Z4 are low. It has been adjusted to be.

Therefore, on the one surface 2a side of the foamed molded body 2, an optimal body pressure dispersing action corresponding to the unevenness of the body is obtained, and as a result, high sleepiness and pleasant sleep are obtained, and the pressure ulcer prevention effect is obtained. High mattress can be provided. Further, on the other surface 2b side of the foamed molded product 2, concentration of body pressure on a specific part of the body is prevented regardless of the sleeping posture, and high sleepiness and sleepiness are achieved by an optimal body pressure dispersing action. Can be provided, and a mattress having a high pressure ulcer prevention effect can be provided.

Furthermore, the body as a whole mattress can be obtained by appropriately changing the combination of the elastic resilience and its distribution state on the one surface 2a side of the foam molded body 2 and the elastic repulsion and its distribution state on the other surface 2b side. It is possible to diversify the pressure dispersion action and the pressure ulcer prevention effect, and provide a mattress that is highly applicable to user needs.

(C) Third Invention of the Present Invention According to the mattress of the third invention of the present application, in addition to the effects described in the above (a) or (b) , the following specific effects can be obtained. That is, in the present invention, the foamed molded body 2 is provided with a large number of non-through holes 3, 4, and 5 extending in the thickness direction, and the size and / or arrangement pattern of the holes 3, 4, and 5 is determined. Since the elastic repulsion degree is adjusted by setting, for example, the elastic repulsion degree can be easily and inexpensively performed as compared with the case of adjusting the elastic repulsion degree by selecting a material, and the mattress can be reduced in price. Promoted.

  Further, since the concave holes 3, 4, and 5 are not penetrated in the thickness direction of the mattress, for example, even if water overflows on the upper surface side of the mattress, it does not flow to the back surface side, and the treatment is performed only on the upper surface side. Therefore, in the mattress for nursing / nursing care in which leakage of urine or the like on the mattress is assumed, it is useful in terms of simplification of nursing / nursing work and reduction of labor.

(D) Fourth invention of the present application According to the mattress of the fourth invention of the present application, in addition to the effects described in the above (a), (b) or (c) , the following specific effects are obtained. It is done. That is, in the present invention, the surface of the foamed molded product 2 is configured to be inclined from one side to the other side in the longitudinal direction in the mounted state on the mattress mounting surface. Bending is suppressed, and for example, low back pain and stiff shoulders are eliminated.

  That is, when a person sleeps on a mattress in a supine position or a lying position, depending on the weight of each part of the body, the sinking increases in the order of buttocks → buttocks → back to shoulder → head, As a result, the entire body is inclined downward from the lower body to the upper body (see line “L3” in FIG. 7C and line “L3” in FIG. 8B). This downward inclination of the body promotes bending of the central axis of the body, increasing the pressure from the shoulder to the neck, resulting in impaired body pressure dispersion and prone to back pain and stiff shoulders. .

  In this case, in anticipation of this body tilt phenomenon, the surface of the foamed molded product 2 is configured to be tilted from one side in the longitudinal direction toward the other side, with the buttocks located on the lower side, By sleeping with the head positioned at the center, the body central axis approaches as horizontal as possible, and a good body pressure dispersing action is obtained, thereby eliminating back pain and stiff shoulders.

(E) Fifth Invention of the Present Invention According to the mattress of the fifth invention of the present application, in addition to the effects described in (a), (b), (c) or (d) above, A unique effect is obtained. In other words, in the present invention, the foamed molded product 2 is made of a natural rubber foamed molded product, so that the material properties of the foamed molded product 2 contribute to improving the performance of the mattress, and the mattress has an even higher commercial value. Is provided.

  The first is the effect of promoting body pressure dispersion. Originally, in natural rubber foamed molded products, when a certain pressure (working pressure) is applied by a weighted body such as a human body, it elastically deforms (sinks) in response to the working pressure and is the same as this working pressure. A “returning pressure action” is known in which a pressure (returning pressure) of a magnitude is applied from the foam molded body 2 to the weighted body. Here, as in the case of the spring, the relationship of “working pressure = elastic coefficient × elastic deformation amount” is established between the working pressure and the elastic deformation amount. Corresponds to “elastic resilience”. Accordingly, by appropriately adjusting the elastic repulsion degree of the foam molded body 2, excessive sinking of the foam molded body 2 is suppressed, and for example, the sleeping posture is changed to a standing posture (that is, an ideal sleeping posture). ) As much as possible, thereby providing a mattress having a high body pressure dispersion action.

  Second, it is an effect of improving the durability of the mattress. In other words, natural rubber has a characteristic that the residual stress due to compression deformation is extremely small compared to synthetic resins, etc., so the mattress is made of a foamed product of natural rubber, so that the residual stress can be maintained regardless of long-term use. As a result, it is possible to provide a mattress excellent in durability required for a mattress for medical use or nursing care.

  It is a perspective view from the surface side of the mattress which concerns on embodiment of this invention.   It is a perspective view from the back side of the mattress.   FIG. 3 is an enlarged cross-sectional view of main parts of III-III in FIG.   It is a distribution state figure of the elastic repulsion degree in the surface side and back surface side of a mattress.   It is a distribution state figure of the elastic repulsion degree as the whole mattress which piled up the distribution state of the elastic repulsion degree of both sides of a mattress.   It is explanatory drawing of the body center axis | shaft and body curve in a standing posture.   It is state explanatory drawings, such as a body center axis | shaft, in the state of lying on the mattress.   It is state explanatory drawings, such as a body center axis | shaft in the state which lay down on the mattress. It is a relative view of the hardness area | region of the said mattress and the human body in a supine posture.   It is explanatory drawing of the relative positional relationship of each zone of a mattress and a human body.   It is explanatory drawing of the relative positional relationship of each zone of a mattress in various sleeping postures, and a human body.   It is a verification data figure of the body pressure dispersion | distribution of a mattress.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

  FIG. 1 shows the front surface 1a side of the mattress 1 according to the embodiment of the present invention, and FIG. 2 shows the back surface 1b side of the mattress 1 respectively. The mattress 1 is a mattress that is particularly suitable for use as medical or nursing care, and has a characteristic technical idea on both the material surface and the shape surface. These will be described individually below.

A: Technical idea in terms of material In this embodiment, the mattress 1 is composed of a foamed molded body 2 formed by foaming natural rubber with only water and air, and has a planar oblong shape having a predetermined thickness. It is molded into. The reason why the mattress 1 is manufactured using the foamed molded body of natural rubber in this way is to obtain the high performance mattress by contributing to the performance improvement of the mattress 1 with the characteristic properties of the natural rubber. Specifically, it is intended to improve body pressure dispersion and improve durability.

"Improved body pressure dispersion"
Natural rubber foamed molded products have a “returning pressure action”, and in this “returning pressure action”, the relationship of “working pressure = elastic coefficient × elastic deformation amount” is established, and this elastic coefficient is the present invention. This corresponds to the “elastic resilience”. Then, by appropriately adjusting the elastic repulsion degree of the foam molded body 2, excessive sinking of the foam molded body 2 is suppressed, and for example, the sleeping posture is changed to a standing posture (that is, an ideal sleeping posture). As described above, it is possible to provide a mattress having a high body pressure dispersion action. An important matter here is a method for adjusting the resilience of the foam-molded body 2. In this embodiment, the foam-molded body 2 is provided with a large number of unpenetrated concave holes extending in the thickness direction. A method of adjusting the elastic repulsion degree by setting the size and / or arrangement pattern of the holes is adopted, and the specific contents thereof will be described later.

"Durability improvement effect"
The “sag” of the foamed molded product is a phenomenon in which the elastic restoring property is gradually lowered when a compressive force is continuously or repeatedly applied to the foamed molded product, and the main cause thereof is the foamed molded product 2. This means that the greater the residual stress, the faster the “sagging” progresses and the lower the durability. Here, natural rubber has a characteristic that the residual stress due to compressive deformation is extremely small as compared with a synthetic resin or the like. For this reason, the mattress is made of natural rubber foamed molding, so there is almost no “sagging” due to residual stress regardless of long-term use. As a result, it is required for medical and nursing mattresses. The mattress excellent in durability can be provided.

B: Technical idea on the form surface There are three characteristic points on the form surface of the mattress 1,
The first feature point is that the resilience of the mattress 1 (that is, the foam molded body 2) is adjusted by changing the size of the holes provided in the foam molded body 2 and setting the hole arrangement pattern. It ’s a point I ’ve done,
The second feature is that the structure of the front surface 1a of the mattress 1 (that is, the front surface 2a of the foam molded body 2) and the back surface 1b (that is, the back surface 2b of the foam molded body 2) are different, and the performance of the two is the same. It is a point that can be diversified,
The third feature point is that the thickness of the mattress 1 is gradually increased from one end side to the other end side in the longitudinal direction, and the mattress 1 is placed on a placement surface such as a bed floor surface. The surface 1a of the mattress 1 is inclined from one side to the other side in the longitudinal direction. Hereinafter, each of these points will be described in detail.

B-1: Regarding First and Second Feature Points Here, the first feature point and the second feature point are related to each other and are inseparable, and therefore will be described together.

  The mattress 1 is composed of a foam molded body 2 obtained by foaming natural rubber with only water and air, and the shape thereof is a predetermined length and a plane rectangular shape as shown in FIGS. Yes. As shown in FIG. 3, the front surface 2a and the rear surface 2b of the foam molded body 2 are provided with concave holes 3, 4, and 5 that are recessed from the front surface side toward the center in the thickness direction. By appropriately setting the size (hole diameter) and arrangement pattern of the concave holes 3, 4, 5, the distribution state of the elastic repulsion degree on the front surface 2 a side and the elastic repulsion degree on the back surface 2 b side of the foamed molded body 2 are set. Each of the distribution states is set individually, and further, the resilience of the foamed molded product 2 as a whole in a state where the distribution of the resilience on the front surface 2a side and the distribution of the resilience on the back surface 2b side are combined. The distribution state of is set.

  In this embodiment, three types of concave holes having different diameters are defined as the concave hole, and the concave hole having the smallest diameter is designated as the first concave hole 3, and the concave having the largest diameter is designated. The hole is a third concave hole 5, and the concave hole having an intermediate diameter between these two concave holes 3 and 5 is a second concave hole 4, and these three, four, and five are appropriately combined.

  Here, the distribution structure of the elastic repulsion degree on each of the front surface 2a and the back surface 2b of the foam molded body 2 and a specific structure for obtaining the distribution state will be described.

B-1-a: Configuration on the surface 2a side of the foam molded body 2 As shown in FIG. 1, the surface 2a side of the foam molded body 2 has three zones in the longitudinal direction of the entire foam molded body 2; That is, it is virtually divided into a first zone Z1 located in the central portion in the longitudinal direction, and a second zone Z2 and a third zone Z3 located on both sides of the first zone Z1. The width dimension in the longitudinal direction of the foamed molded body 2 of each of the zones Z1 to Z3 is the smallest in the first zone Z1, and the second zone Z2 and the third zone Z3 have the same width dimension. And the magnitude | size is set so that it may become larger than the width dimension of the said 1st zone Z1.

  Furthermore, in this embodiment, the first small zone Z7 extending in the longitudinal direction of the foamed molded body 2 with a small width at the substantially central portion in the depth direction of the first zone Z1, and the width of the first small zone Z7 A second small zone Z8 extending in the longitudinal direction of the foamed molded body 2 is set between both sides in the direction.

  In the first zone Z1 excluding the first small zone Z7 and the second small zone Z8, a large number of first concave holes 3 having a small diameter are formed at a predetermined pitch. In the second zone Z2 and the third zone Z3, a large number of second concave holes 4 having an intermediate hole diameter are formed at a predetermined pitch. Further, a large number of third concave holes 5 having the largest hole diameter are formed in the first small zone Z7. In the second small zone Z8, a large number of second concave holes 4 having an intermediate hole diameter are formed.

  In this embodiment, each of the concave holes 3 to 5 has a different hole diameter, but the arrangement pitch is set to be approximately equal. Therefore, the flat area of the remaining part left by the formation of the respective concave holes 3 to 5 is the largest in the zone where the first concave hole 3 is provided, the smallest in the zone where the third concave hole 5 is provided, The zone provided with the two concave holes 4 is sized to be located between these two. Since the load applied to the foamed molded product 2 is supported by the remaining portion, the larger the plane area of the remaining portion, the greater the load resistance, and thus the greater the restoring force against the compression deformation, that is, the elastic repulsion. It can be said that the degree is great.

  From the viewpoint of the degree of elastic resilience, the surface 2a of the foamed molded body 2 is formed with the first concave hole 3 and has a high resilience zone (“high resilience degree” in the drawing). 2), the second concave hole 4 is formed and the middle degree of elastic repulsion is “middle repulsion degree zone” (abbreviated as “medium repulsion degree” in the drawing), and the third concave hole 5 is formed and elastic. There are three zones of “low repulsion degree zone” (abbreviated as “low repulsion degree” in the drawing) with low repulsion degree.

  From the above, the distribution of the elastic resilience on the surface 2a side of the foam molded body 2 in the mattress 1 of this embodiment, as shown in FIG. 4 (a), the first zone Z1, which is a high resilience zone, The second zone Z2 and the third zone Z3, which are “medium resilience zones”, are arranged in the longitudinal direction of the mattress 1, and at the center in the depth direction of the first zone Z1, “low resilience zones” There is a distribution state in which a certain first small zone Z7 and a second small zone Z8 which is a “middle repulsion degree zone” are arranged in the depth direction.

B-1-b: Configuration on the back surface 2b side of the foam-molded body 2 The back surface 2b side of the foam-molded body 2 is in the longitudinal direction at the center in the longitudinal direction of the foam-molded body 2, as shown in FIG. The first zone Z4 is a rhombus having a long axis, and is virtually divided into three zones, a second zone Z5 and a third zone Z6 located on both sides of the first zone Z4. As will be described later, the shape and size of the first zone Z4 is such that when a person sleeps on the mattress 1 regardless of the sleeping posture, and even when the person rolls over, The shape and size are set so that the waist does not come off from the first zone Z4 of the rhombus.

  In the first zone Z4, a large number of first concave holes 3 having a small diameter are formed at a predetermined pitch. In the second zone Z5 and the third zone Z6, many large-diameter third concave holes 5 are formed at a predetermined pitch. The correlation between the hole diameters of the concave holes 3 to 5 and the elastic resilience of the zones formed by the aggregation of the concave holes 3 to 5 is the same as that on the surface 2a side of the foamed molded body 2. .

  From the viewpoint of the degree of elastic resilience, the first concave hole 3 is formed on the back surface 2 b of the foam molded body 2, and the “high repulsion degree zone” and the third concave hole 5 are formed. Thus, there are two zones of “low resilience zone” with low resilience.

  From the above, the distribution of the elastic resilience on the back surface 2b side of the foam molded body 2 in the mattress 1 of this embodiment is a rhombus that is a high resilience zone at the center in the longitudinal direction, as shown in FIG. The first zone Z4 is located, and the first zone Z4 is sandwiched from both sides in the longitudinal direction so that the second zone Z5 and the third zone Z6 which are low resilience zones are located.

B-1-c: Distribution of elastic resilience as a whole of the foamed molded product The distribution of elastic resilience of the foamed molded product 2 as a whole is the distribution of the elastic resilience of the foamed molded product 2 on the surface 2a side. And the distribution state of the elastic repulsion degree on the back surface 2b side. In FIG. 5, the distribution state of the elastic repulsion degree as this whole foaming molding 2 is shown.

  From the overlap of the zone arrangement of the front surface 2a and the zone arrangement of the back surface 2b of the foam molded body 2, as shown in FIG. 5, the distribution of the elastic resilience of the foam molded body 2 as a whole is the longitudinal direction of the foam molded body 2. Zone A located in the center and a pair of left and right zones B corresponding to both ends in the major axis direction of the first zone Z4 on the back surface 2b side of the foam molded body 2 on both sides in the longitudinal direction of the zone A , B, a pair of left and right zones C, C adjacent to the outside in the longitudinal direction of the zone B, a zone D located in the center in the width direction of the zone A, and zones E, E located on both sides of the zone D It has become a preparation.

  Here, the numerical value given to each zone in FIG. 5 is the numerical value of the elastic repulsion degree of each zone for convenience. In other words, the elastic resilience is divided into three stages, and numerically displayed as “high resilience: 1”, “medium resilience: 1.5”, and “low resilience: 2”. And each zone AF shown in FIG. 5 is comprised by what combination of each zone Z1-Z3, Z7, Z8 by the side of the surface 2a of the said foaming molding 2, and each zone Z4-Z6 by the back surface 2b side. The elastic repulsion degree of each zone was shown numerically.

  That is, the zone A is a zone obtained by superimposing the first zone Z1 on the surface 2a of the foam molded body 2 and the first zone Z4 on the back surface 2b side, and the elastic repulsion degree of the first zone Z1 is “1”. The elastic repulsion degree of the first zone Z4 is also “1”, so that the elastic repulsion degree of the zone A is “2”. Zone B is a zone obtained by superimposing the second zone Z2 on the surface 2a of the foam molded body 2 and the first zone Z4 on the back surface 2b side, and the elastic repulsion degree of the second zone Z2 is “1.5”. Since the elastic resilience of the first zone Z4 is “1”, the elastic resilience of the zone A is “2.5”. Hereinafter, similarly, the elastic repulsion degree of the zone C is “3.5”, the zone D is “3”, and the zone E is “3”.

  As a result, when considering the foam molded body 2 as a whole, the elastic rebound degree is the highest (that is, the subsidence due to the body pressure is small) in zone A, followed by zones B and C in the order of elastic repulsion degree. It decreases (that is, sinking due to body pressure increases in sequence). Between the zone A and the zone D and zone E set in the zone A, the zone D has the lowest degree of elastic repulsion and the sinking due to body pressure is large. Then, as the transition from the zone D to the zone E and further to the zone A, the degree of elastic resilience increases sequentially, and the subsidence due to body pressure decreases.

B-2: About the third feature point The third feature point is that the thickness of the mattress 1 is gradually increased from one end side to the other end side in the longitudinal direction so that the mattress 1 This is a point in which the surface 1a of the mattress 1 is inclined from one side in the longitudinal direction toward the other side in the state of being placed on the placement surface. Specifically, as shown by a chain line in FIG. 1 and FIG. 2 (reference numeral 1 ′), it is conceivable to gradually increase the thickness of the mattress 1 from one end side to the other end side.

  However, it is not limited to the method of ensuring the inclination by adjusting the thickness of the mattress 1, and the surface 1 a of the mattress 1 is placed in the longitudinal direction when the mattress 1 is placed without depending on the thickness adjustment of the mattress 1. It is also conceivable to take measures to incline from one side to the other side. For example, the thickness of the mattress 1 is made uniform over the entire area, and the mounting surface on which the mattress 1 is placed is an inclined surface (for example, in a bed whose bed floor can be adjusted, the bed floor is It is conceivable to place a mounting table formed in a slope shape between the mattress 1 and a substantially horizontal mounting surface.

  In this way, the surface 1a of the mattress 1 (that is, the surface 2a of the foamed molded body 2) is inclined from one side to the other side in the longitudinal direction, and the flange portion 45 is located on the lower side, and on the higher side. By sleeping with the head 41 positioned, the head 41 side is positioned higher than the buttocks 45. Due to the difference in height, the sinking of the mattress 1 is caused by the weight of each part of the body. The height difference between the buttocks 45 and the head 41 when the whole body gradually increases from the head 41 toward the head 41 and inclines downward toward the head 41 is offset. As close to the horizontal as possible, a good body pressure dispersing action can be obtained, thereby eliminating back pain and stiff shoulders.

C: Usage Form of Mattress 1 etc. The usage pattern and the effects and the like associated therewith when sleeping using the mattress 1 configured as described above will be described.

  FIG. 6 shows the standing posture of the person 40. In this standing posture, the central axis L1 of the body is linear. Further, the body curve L2 seen when the four protruding portions on the back side of the person 40, that is, the head, scapula heel, and heel portions are removed is slightly curved.

  Such a standing posture is the most natural and stable ideal posture with little fatigue, and such a standing posture is held as a sleeping posture on the mattress 1 as shown in FIG. If it is done, it will become an ideal sleeping posture, and as described above, it is possible to obtain high sleep or sleep.

  Here, although there is a part overlapping with the description in the “Effects of the Invention” section, the relationship between the resilience of the mattress 1 and the sleeping posture of the person 40 will be described with reference to FIGS.

C-1: Relationship between Distribution Form of Elastic Repulsion and Sleeping Position Among the body parts of the person 40, the buttocks 44 are the most protruding parts in both the supine position and the lying position. Therefore, for example, if the resilience of the mattress 1 is set to be approximately the same, the part of the mattress 1 corresponding to the projecting part, that is, the zone located near the center in the longitudinal direction, It will sink significantly compared to the zone. As a result, as shown in FIGS. 7 (a) and 8 (a), the body center axis “L1”, which is preferably linear, is “L1a” shown in FIGS. It will be bent greatly like “L1b” shown in (b).

  As a result, if the body center axis “L1” is bent, the part corresponding to the buttocks or shoulders in the supine posture where the sinking is maximized or the part corresponding to the buttocks in the recumbent posture becomes a pressure point, and pressure ulcer may occur. In addition, as described above, the lumbar region that is in the middle of each compression point and has the least sinking becomes a fulcrum where the central axis of the body greatly changes in bending, and can cause back pain or stiff shoulders.

  In such a case, like the mattress 1 of this embodiment, the zone A having a high degree of elastic resilience is disposed at the center in the longitudinal direction, and the zone B having a lower degree of elastic resilience than the zone A is provided on both sides of the zone A. Further, by disposing the zone C having a lower elastic repulsion degree than the zone B outside the zone B, the most protruding heel portion in both the supine posture and the recumbent posture is the most elastic repulsion rate in the mattress 1. Corresponds to the high zone A, and the mattress 1 is elastically deformed along the unevenness of the body without excessively sinking, thereby obtaining an optimal body pressure dispersing action. It is possible to provide a mattress that provides good sleepability and a high pressure ulcer prevention effect.

  FIG. 11 (a) shows the body pressure distribution data when sleeping in a supine posture using a conventional mattress, and FIG. 11 (b) shows the supine using the mattress 1 according to this embodiment. The body pressure dispersion data when sleeping in a posture is shown respectively. From FIG. 11 (a), the body pressure is concentrated on the head, scapula, buttocks and buttocks protruding to the back side, and the parts are the compression points, and the human figure is not clearly visible. Therefore, it is confirmed that the body pressure is supported at the above four points. Therefore, it can be said that the body pressure dispersion action is poor.

  On the other hand, in FIG. 11B, there is no local compression point, and the image can be confirmed according to the human shape. This suggests that the body pressure dispersion action is high and the body is ideally sinking, thus reducing the burden on the body.

Here, the effect of the zone D and the zone E of the mattress 1 will be described. When the person 40 sleeps in a supine posture, the most likely site for pressure sores is the sacrum portion that extends along the spine between the two hills of the heel 44. Therefore, in order to prevent or suppress the occurrence of pressure ulcers in the sacrum, it is effective to prevent concentration of body pressure on the sacrum. From this point of view, in this embodiment, the zone D and the zone E are provided, and the sacrum portion is supported by the zone D having a low degree of elastic repulsion to prevent concentration of body pressure. It is supported by a zone E having a high degree of elastic repulsion to prevent excessive subsidence.
C-2: Relationship between rhombus zone A and sleeping posture

Considering the person's sleeping posture, even when the person 40 is sleeping on the mattress 1 in the supine posture as shown by the solid line in FIG. 9, the person lies down to the right or left from the supine posture as shown by the chain line in FIG. Even in the lying position, the waist portion 43 and the heel portion 44 of the person 40 are located in the zone A set on the mattress 1 and do not deviate from the zone A. The shoulder 42 is located in the zone B or the zone C.

  FIG. 10 shows various sleeping postures including a lying posture, and the body center axis L1 in this case (a line connecting the shoulder portion 42, the waist portion 43, the hip portion 44, and the hip portion 45). In any of the many sleeping postures shown here, it can be seen that the waist 43 and the buttocks 44 of the person 40 are located in the zone A, and the shoulder 42 and the buttocks 45 are located in the zone C.

  Accordingly, the lumbar portion 43 and the heel portion 44 that protrude most in the supine posture and the lying posture correspond to the zone A having a high degree of elastic resilience, so that excessive sinking of the mattress 1 in these portions is suppressed, and the body pressure is dispersed. The action is promoted. In addition, the shoulder portion 42 that protrudes in the recumbent posture and causes the body center axis to be greatly deformed by stretching the shoulder portion 42 corresponds to the zone C having a low degree of elastic resilience, so that the portion of the shoulder portion 42 sinks appropriately. Thus, deformation of the body central axis L1 (deformation of the mattress 1 in the thickness direction) is suppressed.

  As a result, concentration of body pressure on a specific part of the body is prevented regardless of the sleeping posture, and an optimal body pressure dispersion action provides high sleep and sleep and provides a mattress with a high pressure ulcer prevention effect. Will be able to.

1 ·· Mattress 2 ·· Foamed molded product 3 ··· 1st recessed hole 4 ··· 2nd recessed hole 5 · · 3rd recessed hole

Claims (5)

A mattress composed of a flat elongated rectangular foam (2),
One surface of the foamed molded body (2) is partitioned into at least three zones (Z4), (Z5), (Z6) in the longitudinal direction, and the first zone (Z4) located near the center in the longitudinal direction is the above-mentioned While the rhombic shape has a major axis or a minor axis in the longitudinal direction, the elastic repulsion degree of each of the zones (Z4), (Z5), and (Z6) has a thickness from the one surface to the foamed molded body (2). By setting the size and / or arrangement pattern of a number of non-through holes (3), (4), (5) provided so as to extend in the vertical direction, the first zone (Z4) is increased. The mattress is adjusted such that both the second zone (Z5) and the third zone (Z6) located on both sides of the first zone (Z4) are lowered. A mattress composed of a flat elongated rectangular foam (2),
One surface (2a) of the foamed molded product (2) is partitioned into three zones (Z1), (Z2), (Z3) in the longitudinal direction, and the zones (Z1), (Z2), The elastic repulsion degree of (Z3) is a large number of non-through holes (3), (4), (5) provided in the foamed molded body (2) so as to extend in the thickness direction from the one surface. By setting the size and / or arrangement pattern, the first zone (Z1) located near the center in the longitudinal direction is high, and the second zone (Z2) and the third zone located on both sides of the first zone (Z1) are high. Both the zones (Z3) are adjusted to be lower, and the other surface is divided into three zones (Z4), (Z5), (Z6) in the longitudinal direction, and is located closer to the center in the longitudinal direction. The first zone (Z4) has a rhombus shape having a major axis or a minor axis in the longitudinal direction. On the other hand, the elastic repulsion degree of each of these zones (Z4), (Z5), (Z6) is a large number of non-penetrating holes provided in the foamed molded body (2) so as to extend in the thickness direction from the one surface. By setting the size and / or arrangement pattern of the concave holes (3), (4), (5), the first zone (Z4) is high and the first zones (Z4) located on both sides of the first zone (Z4). The mattress is characterized in that both the second zone (Z5) and the third zone (Z6) are adjusted to be low . The foamed molded body (2) is provided with a large number of unpenetrated concave holes (3), (4), (5) extending in the thickness direction, and the concave holes (3), (4), (5). mattress according to claim 1 or 2 elastic reaction of the size and / or arrangement pattern setting of is characterized in that it is adjusted. In placement state onto the mattress mounting surface, according to claim 1, 2 or 3, characterized in that the surface of the foamed molded article (2) is inclined toward the one side in the longitudinal direction to the other side A mattress according to any one of the above.   The mattress according to any one of claims 1, 2, 3 and 4, wherein the foamed molded body (2) is composed of a foamed product of natural rubber.

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