JP2010088663A - Pillow - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pillow adjustable in height independently when a user lies on the back and when the user lies on a side. <P>SOLUTION: The pillow 1 has a head placement member 2 constructed from a flexible material and having a flat rectangular parallelepiped shape, and also has an urging device 4 for urging a portion above a cavity 2a in the head placement member 2 and supporting the portion above the cavity 2a in that state. The urging device 4 includes: rectangular link mechanisms 6 and 6 composed of lower links 7 and 7, front links 8 and 8, rear links 9 and 9, and upper links 10 and 10; tension springs 17 and 17 for urging the rectangular link mechanisms 6 and 6 so that the upper links 10 and 10 are displaced upward; a height adjusting means for the time when the user lies on the back and adjusting the height of the upper links 10 and 10 when the user lies on the back; and a height adjusting means for the time when the user lies on the side for adjusting the height of the upper links 10 and 10 when the user lies on the side. The height of the upper links 10 and 10 can be independently adjusted when the user lies on the side and when the user lies on the back. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pillow used as a bedding, and more particularly to a pillow that automatically changes in height when lying on its back and lying on its side.

  It is most natural and preferable that the posture of the person at sleep is a state in which the upright state is tilted as it is and turned upside down. At this time, the back head, which is the lowest position in the head, is slightly higher than the back. Therefore, it is desired that the pillow used as the bedding is set so that the position of the back of the head is slightly higher than the back when a person is sleeping on his / her back (hereinafter, referred to as lying on his / her back).

  On the other hand, when a person lays down during sleep and sleeps sideways (hereinafter, referred to as sideways sleep), the head is supported by the shoulder, so the position of the head is higher than when lying on the back. Therefore, it is desired that the pillow automatically changes in height depending on whether it is sleeping on its back or lying on its side.

  Conventionally, various pillows whose height automatically changes have been proposed. For example, Patent Document 1 discloses a lower support plate, a head support plate disposed in a substantially parallel state with respect to the lower support plate, and a head placed thereon, and a substantially parallel state provided on the lower support plate. A support plate support mechanism that supports the head support plate so that the head support plate can be moved up and down, and a cushion portion installed on the head support plate. The support plate support mechanism has its lower end pivoted to the lower support plate. A first support member and a second parallel member that are connected to each other and that have an upper end pivotably connected to the head support plate and extend obliquely from the lower support plate toward the head support plate. A pillow having a support member and a biasing means such as a coil spring that biases the first support member and the second support member through a head support plate against a load that tilts them in an inclined direction is disclosed. Yes.

  In this pillow, when the head is placed on the cushion portion and lying on its back, the first and second support members fall down against the urging force of the urging means due to the weight of the head, and the head support plate is at the lowest position. Descends to a minimum height. When the head is turned and turned sideways and the head is supported by the shoulder and the load acting on the head support plate is reduced, the first and second support members are raised by the urging force applied by the urging means, and the head The pillow rises to a height at which the load and the urging force by the part are in a balanced state. And this pillow is provided with the adjustment means which adjusts the biasing force of a biasing means, and can adjust the height at the time of lying down sideways. Furthermore, this pillow is provided with a stopper mechanism in which the support member is locked at a predetermined inclination angle against the biasing force of the biasing means, and the height when not in use is uniform.

  Patent Document 2 discloses a pair of X-links in which a first link member and a second link member are rotatably connected to each other at an intermediate pivot portion and separated in the left-right direction, and each X-link. An urging mechanism comprising a front and rear upper linking member for coupling the upper portions of the two link members, and a spring member for applying a urging force in a direction in which the two link members of each X-type link approach each other in the front-rear direction. Is disclosed in the cavity of the head-mounted member. The urging mechanism urges the head-mounted member upward by urging both X-shaped links upwardly by the spring member.

When this pillow is placed on its head with its head placed on its back, the X-links shrink downwardly against the urging force of the spring member due to the weight of the head, and the height is lowered. When the head is turned sideways and turned sideways and the head is supported by the shoulders and the load acting on both X-type links decreases, both X-type links rise due to the urging force of the spring members, and the height of the pillow increases. As described above, the heights of the pillows for sleeping on the side and lying on the side are made different by utilizing the fact that the loads acting on both X-type links are different between sleeping on the back and sleeping on the side. And this pillow is provided with the adjustment means which adjusts the urging | biasing force of a spring member, and can adjust the height of the pillow at the time of lying down according to an individual's physique. Furthermore, this pillow can also adjust the height at the time of non-use by restrict | limiting the space | interval which can be separated in the up-down direction of both link members.
JP 2007-98153 A International Publication No. 2006/013708 Pamphlet

  However, the pillow disclosed in Patent Document 1 has a uniform height because the head support plate sinks to the lowest position when lying on its back. Therefore, it is not possible to appropriately adjust the height of the pillow when lying on its back, which occupies the longest time during bedtime, according to the individual's physique and the like.

  In addition, adjusting the height of the pillow when lying on its back can be assumed by exchanging the cushion part installed on the head support plate. However, in order to adjust the height of the pillow, it is necessary to prepare a plurality of cushion portions having different heights. Furthermore, if the cushion part is replaced, the height at the time of lying down also changes, so adjustment is difficult.

  Further, the height when lying sideways is a height in which the load by the head and the urging force of the urging means are balanced. Therefore, since the height of the pillow changes due to slight fluctuations in the load due to the head, the height when lying on the side is not stable, giving the user a fluffy feeling.

  On the other hand, the pillow disclosed in Patent Document 2 has a constant height when lying on its back and cannot absorb individual differences. Further, since the load and the spring force are concentrated on the crossing axis of both X-type links, it is necessary to be strong, and there is a problem in terms of weight and height. Further, every time the X-type link is lowered and raised, there is a problem that a sliding portion is generated at the rear end of the upper surface link and the rear end of the lower surface link, and friction and sound are generated.

  In view of the above points, an object of the present invention is to provide a pillow capable of independently adjusting the height when sleeping on its back and sleeping on its side.

  In order to achieve such an object, the pillow of the present invention urges a flat rectangular parallelepiped head-mounted member formed of a flexible member having a cavity inside and an upper portion of the cavity of the head-mounted member upward. And a biasing device provided in the cavity so as to support the biasing device, wherein the biasing device is a front side on the side where the neck is located with a human head placed on the head mounting member. A lower link extending horizontally in the front-rear direction, a front link having a lower end pivotably connected to the front end of the lower link, and a rear end of the lower link A rear link having a lower end pivotably connected thereto, and an upper link having a front end connected to the upper end of the front link and a rear end connected to the upper end of the rear link, respectively. A rectangular link mechanism and a first attachment that biases the rectangular link mechanism so that the upper link is displaced upward. Means, height adjustment means for adjusting the height of the upper link when sleeping with the person's head lying on the head-mounted member, and the person's head on the head-mounted member A horizontal sleeping height adjustment means that adjusts the height of the upper link when lying on the side, and the lying height adjustment means and the lying sleeping height adjustment means The height of the upper link between when sleeping with the person's head placed sideways and when lying on the back is configured to be independently adjustable. .

  According to the pillow of the present invention, the sleeping height adjustment means and the lying sleeping height adjustment means are provided, and the head is placed on the head-mounted member in a sleeping position (hereinafter referred to as lying on the sleeping face). )) And the height of the upper link when the head is placed sideways (hereinafter referred to as sideways sleeping) can be adjusted independently. The first urging means urges the rectangular link mechanism so that the upper link is displaced upward, so that when the user lays down and turns from lying on the side to lying down, the upper link adjusts the height when lying on the side. It automatically displaces up to the height adjusted by the means. In addition, when turning over from lying down to lying on the back, the weight of the head acting on the upper link increases due to a change in posture, so that the upper link is adjusted to the height adjusted by the height adjustment means for sleeping It is automatically displaced downward. In this way, when the posture is changed by turning over, the upper link automatically displaces and the pillow automatically changes to an appropriate height. It can be adjusted independently according to the individual's physique. Therefore, the optimal posture can be taken both when sleeping on the side and when lying on the back, and comfortable sleep can be obtained.

  Also, the height adjustment means for lying on the supine side adjusts the lowermost position of the upper link by adjusting the height of the abutting portion when the upper link is lowered, By adjusting the length of the bendable belt spanned between one end fixed below the link and the upper link, the uppermost position of the upper link is adjusted, When sleeping with the head on its back, the upper link sinks to the lowest position, and when sleeping with the person's head lying on the head mounted member, the upper link is maintained at the highest position. As described above, it is preferable to include an adjusting means for adjusting the urging force of the first urging means.

  When sleeping with the person's head lying on the head-mounted member, part of the head is supported by the shoulder, so the person's head is placed on the head-mounted member while lying on the head Compared to the case, the load due to the weight of the head acting on the head-mounted member is small. Therefore, when the person's head is placed on his head on the head and laid down, the upper link sinks to the lowest position, and when the person's head is placed on his or her head and laid down, The urging force of the first urging means is adjusted by the urging force adjusting means so that the upper link is maintained at the highest position.

  When the upper link is lowered, the height adjustment means when the upper link is lowered adjusts the lowest position of the upper link by adjusting the height of the abutting portion. It becomes possible to adjust. When the head is placed on the pillow in an upright posture, the upper link sinks to the lowest position against the urging force of the first urging means. Therefore, the height of the pillow when lying on its back does not depend on the urging force of the first urging means, so it is stable and does not give the user a fluffy feeling. Further, the horizontal sleeping height adjusting means adjusts the length of the bendable belt that is stretched between the one end fixed below the upper link and the upper link, so that the uppermost position of the upper link is increased. Therefore, it becomes possible to easily adjust the height of the pillow when lying on its side. When the person's head is placed sideways on the head-mounted member and sleeps, the upper link is maintained at the highest position. Therefore, since the urging force of the first urging means is sufficiently larger than the head load when lying on the side, the height of the pillow when lying on the side does not give the user a fluffy feeling.

  The height adjustment means when lying on its back has a cam pivotally supported on a shaft provided at the rear of the lower link, and rotates the cam so that the rear link falls forward. It is preferable to adjust the lowest descending position of the upper link by changing the cam surface in contact therewith.

  In this case, since the lowest position of the upper link can be adjusted by the rotation of the cam, the height adjustment means for lying on the back can be simplified. Furthermore, by providing a cam having an appropriate cam surface, the height of the pillow when lying on its back can be finely adjusted. In addition, the cam is pivotally supported on the shaft provided at the rear of the lower link, and no cam or shaft is arranged on the front side of the pillow where the neck is located, so even if the neck sinks It does not get in the way.

  The first biasing means is preferably a tension spring having one end fixed to the outside of the upper portion of the front link and the other end fixed to the vicinity of the rear end of the lower link.

  In this case, when the upper link is displaced downward, the tension spring biases the front link so as to displace the upper link upward in a state in which the tension spring is lifted forward. For this reason, when the user goes to bedside from lying on his / her back, the upper link is automatically displaced so that the height of the pillow adjusted by the bedtime height adjusting unit is adjusted. Further, when the user places his / her head on his / her head on the head-mounted member, the head sinks smoothly.

  At this time, since one end side of the tension spring is fixed to the outside of the upper portion of the front link, when the upper link is displaced downward, if one end side of the tension spring is positioned below the other end side, The tension spring biases the upper link so that it is displaced downward. In this case, since the upper link is not biased upward by the tension spring, it does not return to the original position. Therefore, it is preferable that the urging device includes a second urging unit that urges the upper link upward when the upper link is lowered by a predetermined amount or more.

  Further, the height adjustment means when lying on the back includes a cam pivotally supported on a first shaft provided at the rear portion of the lower link, a first end fixed to the cam, and the other end on a third shaft. It has a wire that is wound and fixed, rotates the third shaft, rotates the cam via the wire, and changes the cam surface that comes into contact with the rear link that falls forward, thereby changing the lowermost position of the upper link. The horizontal sleeping height adjusting means is wound around and fixed between the upper link and the first shaft, one end of which is fixed to the upper link and the other end is wound around and fixed to the first shaft. The belt has a bendable belt, and adjusts the belt length by rotating the first shaft, thereby adjusting the highest rising position of the upper link. When the person's head is placed sideways and laid down, the uppermost link of the upper link is maintained. As described above, the one end side is fixed to the outside of the upper portion of the front link, and the other end side is a tension spring that is wound around and fixed to a second shaft that is freely rotatable. It is preferable that the first shaft, the second shaft, and the third shaft are provided adjacent to each other in the front-rear direction in the vicinity of the rear end portion of the lower link.

  In this case, by rotating the adjacent first axis, second axis, and third axis, the height when lying on the side, the urging force of the first urging means, the height when lying on the back, respectively. Can be adjusted. And since the operation part (a 1st axis | shaft, a 2nd axis | shaft, and a 3rd axis | shaft) which adjusts these is gathered in one place, operativity is good. Furthermore, since the first shaft, the second shaft, and the third shaft are provided in the vicinity of the rear end portion of the lower link, the first shaft, the second shaft, and the third shaft are not provided on the front side of the pillow on which the neck portion is positioned. It does not get in the way.

  In addition, a bag body that has a through-hole and has an internal volume that decreases and increases as the upper link descends and rises due to air flowing in and out through the hole is provided in the cavity of the head-mounted member. preferable.

  In this case, as the upper link descends, the air in the bag flows out through the hole, but the amount of air outflow per unit time is limited by the size of the hole, so the upper link rapidly descends. Is limited. Therefore, when the upper link that sinks when the user places his / her head on the head-mounted member reaches the lowest lowered position, the occurrence of an impact on the head that may disturb sleep is prevented. Can do. Then, as the upper link rises, air flows from the outside into the bag through the hole, and the internal volume of the bag is increased again.

  A pillow according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, a pillow 1 according to an embodiment of the present invention includes a flat rectangular parallelepiped head-mounted member 2 formed from a flexible member having a cavity 2 a therein, and a head-mounted member 2. Provided in the cavity 2a so as to support the lid member 3 disposed on the rear side and covering the back of the cavity 2a of the head-mounted member 2 and the upper portion of the cavity 2a of the head-mounted member 2 so as to urge upward. And an urging device 4. Here, in the state where the person's head is placed on the pillow 1, the side on which the top of the head is located is the rear side, and the side on which the person's neck is located is the front side. Further, the pillow 1 is covered with the outer covering cloth 5 in a state where the urging device 4 is disposed in the cavity 2 a and the lid member 3 is adhered to the rear end of the head mounting member 2.

  The pillow 1 is a sleeping height adjustment function that adjusts the height when sleeping with the person's head lying on the back (hereinafter referred to as lying on the sleeping face) and the person's head with the head lying horizontally. There are two height adjustment functions including a horizontal sleep height adjustment function for adjusting the height of time (hereinafter referred to as “horizontal sleep”).

  The head-mounted member 2 is formed of a flexible member, and here, is formed of a molded body made of high-resilience urethane foam. High-resilience urethane foam has an advantage that the temperature dependence of hardness is low as compared with low-resilience urethane foam that is widely used as a material for pillows. Therefore, there are few troubles due to temperature differences, such as a pillow made of low-resilience urethane foam that is soft in summer and hard in winter. Although the high resilience urethane foam has a low familiarity, the pillow 1 has the two height adjusting functions, so that there is no problem due to the low familiarity. The head-mounted member 2 is formed in a flat rectangular parallelepiped shape in which the shape in plan view is a horizontally long substantially rectangular shape. The head-mounted member 2 may be made of a molded product made of low-resilience urethane foam. The head-mounted member 2 is formed such that its upper surface is inclined forward and its front surface is inclined rearward.

  The cavity 2a is formed with the rear opening. The head-mounted member 2 has a large number of air holes 2b communicating with the outside of the cavity 2a at the center of the upper portion of the cavity 2a, thereby preventing heat from being accumulated in the cavity 2a. A three-dimensional knitted fabric 5a is provided on the outer cover cloth 5 located above the vent hole 2b so that the vent from the vent hole 2b is also applied to a portion where the vent hole 2b does not exist. The shape of the head-mounted member 2 is not limited to the shape shown in the drawing as long as it is formed in a flat rectangular parallelepiped shape having the hollow portion 2a.

  When the person's head is placed on the pillow 1, the upper portion of the cavity 2 a of the head-mounted member 2 is more than a predetermined amount so that the presence of the urging device 4 disposed in the cavity 2 a is not felt and the user feels uncomfortable. A thickness, for example, a thickness of about 20 to 30 mm is required. However, it is not preferable that the overall height of the pillow 1 is too high. Therefore, the thickness of the upper part of the cavity 2a of the head-mounted member 2 is greater than the thickness of the lower part of the cavity 2a. On the other hand, the thickness of the bottom part of the head-mounted member 2 is preferably thin, for example, about 10 mm. However, if the thickness of the bottom portion is reduced, sufficient strength cannot be obtained, and it is particularly easy to tear during molding. Therefore, the head mounting member 2 is formed by covering the outer periphery of the inner mold for the cavity 2a and molding the head mounting member 2 so that the entire inner surface of the cavity 2a is stretched and the head mounting member 2 is reinforced.

  The lid member 3 is formed of a flexible member in the same manner as the head-mounted member 2, and here is formed of a molded body made of high resilience urethane foam. The lid member 3 has a thickness similar to that of the front side portion of the head-mounted member 2 and has a flat rectangular parallelepiped shape that is short in the front-rear direction so that its front end surface matches the shape of the rear end surface of the head-mounted member 2. Is formed. The rear end surface of the head-mounted member 2 is formed vertically, and the front end surface of the lid member 3 is aligned with the rear end surface in a state where the urging device 4 and the like are disposed in the cavity 2a, and the joint surface is bonded. is doing.

  The urging device 4 includes a pair of rectangular link mechanisms 6 and 6 disposed in the cavity 2a so as to be separated from each other in the lateral direction. Each rectangular link mechanism 6, 6 includes a lower link 7, 7 extending horizontally in the front-rear direction, a front link 8, 8 having a lower end pivotally connected to a front end portion of the lower link 7, 7, and a lower side The rear links 9 and 9 whose lower ends are rotatably connected to the rear ends of the links 7 and 7, the front ends of the front links 8 and 8, and the upper ends of the rear links 9 and 9 The rear end portion is composed of upper links 10 and 10 that are rotatably connected to each other. Here, the forward inclination angle of the front links 8 and 8 is larger than the forward inclination angle of the rear links 9 and 9, and the upper links 10 and 10 are inclined forwardly. It is configured. When the biasing device 4 is disposed in the cavity 2a, the upper links 10 and 10 face the upper portion of the cavity 2a. Each of the links 7 to 10 is made of an elongated metal flat plate, and the links are rotatably connected by a hinge mechanism, although details are not shown.

  As shown in FIG. 3, the left and right lower links 7 and 7 are connected in parallel to each other so as to maintain a predetermined separation distance between the left and right by an elongated rectangular lower connecting member 11. The lower connecting member 11 is formed of an elongated rectangular metal flat plate, and connects the rear ends of the lower links 7 and 7 together. Here, the lower connecting member 11 is formed integrally with the lower links 7 and 7, but may be fixed to the lower links 7 and 7 by welding or the like. The left and right upper links 10 are connected in parallel to each other so as to maintain a predetermined separation distance between the left and right by an elongated rectangular upper connecting member 12. The upper connecting member 12 is formed of an elongated rectangular metal flat plate, and connects the rear ends of the upper links 10 and 10 together. Here, the upper connecting member 12 is formed integrally with the upper links 10 and 10, but may be fixed to the upper links 10 and 10 by welding or the like.

  As shown in FIGS. 2 and 3, the urging device 4 includes three shafts 13 to 15 that extend in parallel in the left-right direction. These shafts 13 to 15 are provided adjacent to the rear ends of the lower links 7 and 7 in the front-rear direction, and are positioned in the vicinity of the upper portion of the lower connecting member 11. The three shafts 13 to 15 are all formed of metal pipes, and are arranged in the order of the first shaft 13, the second shaft 14, and the third shaft 15 from the front side. The left and right lower links 7, 7 have shaft support plates 16, 16 protruding upward and fixed to the outside of their rear ends, respectively, and these shaft support plates 16, 16 support the shafts 13-15. Three shaft support holes are formed. The three shafts 13 to 15 are pivotally supported by being inserted through and supported by the shaft support holes of the left and right shaft support plates 16 and 16. Each of the three shafts 13 to 15 has an adjusting portion 13a to 15a at an end portion protruding outward from the right shaft support plate 16, and here, the rotation can be adjusted with a hexagon wrench. Hex wrench holes are formed as the adjustment portions 13a to 15a. Although not shown, each of the three shafts 13 to 15 has a brake mechanism, and is configured so as to be able to maintain a state in which the rotation is adjusted. Further, the three shafts 13 to 15 are provided in the vicinity of the rear ends of the lower links 7 and 7 and are not provided on the front side of the pillow 1 where the neck is located, and do not interfere with the sinking neck.

  The urging device 4 includes tension springs 17 and 17 as first urging means for urging the rectangular link mechanisms 6 and 6 so that the upper links 10 and 10 are displaced upward. The tension springs 17 and 17 are stretched by fixing one end side to the outside of the upper part of the front links 8 and 8 and fixing the other end side to the second shaft 14 via the wires 17b and 17b. Yes. Here, hooks on one end side of the tension springs 17 and 17 are hooked in holes of spring mounting pieces 17 a and 17 a fixed so as to protrude outward near the upper end portions of the front links 8 and 8. The hooks on the other end side of the tension springs 17 and 17 are locked to one end side of the wires 17b and 17b, and the other end side of the wires 17b and 17b is wound around and fixed to the second shaft 14. In this way, the upper springs 10 and 10 are urged to be displaced upward by the spring force acting in the direction in which the front links 8 and 8 are raised by the tension springs 17 and 17.

  The urging device 4 includes conical springs 18 and 18 as second urging means for urging the upper links 10 and 10 upward when the upper links 10 and 10 are lowered by a predetermined amount or more. The bottom sides of the conical springs 18 and 18 are fixed to the upper surface near the center in the front-rear direction of the lower links 7 and 7, and the top side is a free end. In this way, when the upper links 10 and 10 sink below the tops of the conical springs 18 and 18, the upper links 10 and 10 are compressed by the upper links 10 and 10 by the spring force as the restoring force of the conical springs 18 and 18. The links 10 and 10 are biased so as to be displaced upward. In addition, although a leaf | plate spring may be used instead of the conical springs 18 and 18, the conical springs 18 and 18 are more preferable since they have durability.

  The urging device 4 includes cams 19 and 19 as members having portions that come into contact when the upper links 10 and 10 are lowered. When the upper links 10, 10 are lowered, the rear links 9, 9 fall forward, and the front surfaces of the rear links 9, 9 come into contact with the cam surfaces of the cams 19, 19. The cam surfaces of the cams 19 and 19 are the abutting portions. Then, the lowest position of the upper links 10 and 10 can be adjusted by rotating the cams 19 and 19 and changing the cam surface that comes into contact with the front surfaces of the rear links 9 and 9 that fall forward. The cams 19, 19 are rotatably supported by the first shaft 13 immediately above the lower links 7, 7. Here, the cams 19, 19 are inserted through the first shaft 13, and a through hole penetrating in the left-right direction is formed. A cam surface whose distance from the through hole gradually changes is provided on the outer periphery thereof. ing. Further, one ends of the wires 20 and 20 are fixed to the cams 19 and 19, and the other ends of the wires 20 and 20 are wound around and fixed to the third shaft 15. The cams 19 and 19 are pivotally supported by a first shaft 13 provided at the rear of the lower links 7 and 7, and the cams 19 and 19 Since the 1st axis | shaft 13 is not arrange | positioned, even if a neck part sinks, it does not get in the way. Furthermore, when the cams 19 and 19 have an appropriate cam surface, the lowest position of the upper links 10 and 10 can be finely adjusted.

  In the rear links 9, 9, the action line 9a as the link is a straight line as shown in FIG. 2, but in order to avoid interference with the second shaft 14 and the third shaft 15 when it falls forward. Is formed in a substantially C shape in side view so as to swell rearward from the action line 9a. The rear links 9 and 9 have upper front surfaces that are in contact with the cams 19 and 19, but the upper links 10 and 10 can be submerged to the immediate vicinity of the lower links 7 and 7. Thus, the shape of the upper front surface is matched with the shape of the cam surface when the cams 19 and 19 are tilted.

  The urging device 4 includes bendable belts 21 and 21 that are stretched between one end fixed below the upper links 10 and 10 and the upper links 10 and 10. The belts 21 and 21 prevent the upper links 10 and 10 from rotating upward due to the urging force of the tension springs 17 and 17. Further, by adjusting the span length of the belts 21 and 21, it is possible to adjust the most elevated position of the upper links 10 and 10. Here, the belts 21 and 21 are made of cloth, and one end side thereof is wound around and fixed to the first shaft 13, and the other end side is attached and fixed to the upper connecting member 12. Further, the upper links 10 and 10 are not obstructed by the belts 21 and 21 from being displaced downward, so that the upper links 10 and 10 can be freely displaced downward regardless of the span length of the belts 21 and 21.

  Furthermore, a lower plate 22, a mesh cloth 23, an upper plate 24, and a flexible sheet 25 are attached to the urging device 4. The lower plate 22 is made of a hard resin flat plate made of PET (polyethylene terephthalate) or the like, and is formed in a shape in which a front portion and a central portion are cut from a substantially rectangular shape substantially the same as the lower surface of the cavity 2a. The lower plate 22 is fixed to the lower surfaces of the lower links 7 and 7 and the lower connecting member 11 by bolts or the like (not shown). By placing the lower plate 22 on the lower surface of the cavity 2a, the urging device 4 can be disposed at a predetermined position in the cavity 2a. Thus, since the lower links 7 and 7 and the lower connecting members 11 which are metal members are covered with the lower plate 22, the user does not sense the presence of the metal members from the lower part of the pillow 1 and feels strange. There is no.

  The mesh cloth 23 is stretched between the left and right rear links 9 and 9 and the upper links 10 and 10.

  The upper plate 24 is made of a hard resin flat plate made of PET or the like, and is formed in a substantially U shape in accordance with the shapes of the upper links 10 and 10 and the upper connecting member 12. The upper plate 24 is fixed to the upper surfaces of the upper links 10 and 10 and the upper connecting member 12 by bolts or the like (not shown). As described above, since the upper surfaces of the upper links 10 and 10 and the upper connecting member 12 that are metal members are covered with the upper plate 24, the user does not sense the presence of the metal members from the upper part of the pillow 1, and feels strange. No.

  The flexible sheet 25 is formed of a single soft resin sheet made of urethane or the like, and extends between the front upper surface of the upper links 10 and 10 and the central front surface of the front links 8 and 8 from side to side. It is stretched out. The flexible sheet 25 has a large number of ventilation holes.

  The urging device 4 is disposed in the cavity 2a. At this time, a sponge member 26 as a flexible member is provided above and behind the urging device 4. Thereby, even if the head mounting member 2 is sufficiently softened, the hardness of the upper plate 24 is not felt. A number of vent holes are formed in the center of the sponge member 26. Furthermore, as shown in FIG. 5, an aggregate sponge member 27 is provided on both the left and right outer sides of the biasing device 4. The aggregate sponge member 27 is formed in a substantially rectangular parallelepiped shape so that the upper surface sinks as the load applied to the upper surface increases, and the upper surface is restored to the original state. The aggregate sponge member 27 may be made of an elastic material other than the sponge material.

  The pillow 1 configured as described above is configured so that the front links 8 and 8 are raised by the urging force (tensile force) of the tension springs 17 and 17 when nothing is placed thereon, that is, the upper link 10. , 10 are urged to rise and displace upward. However, since the uppermost links 10 and 10 are regulated at the highest positions by the belts 21 and 21, the upper links 10 and 10 are eventually located at the highest positions. The most elevated position can be adjusted by engaging a hexagon wrench with the adjusting portion 13a to rotate the first shaft 13 and changing the span of the belts 21 and 21. As described above, the pillow 1 can adjust the most elevated position of the upper links 10 and 10 by adjusting the span length of the belts 21 and 21. The height of the pillow 1 at this time is, for example, 7 cm to 15 cm. In addition, since the span length of the two belts 21 and 21 spaced apart from each other is adjusted by one first shaft 13, the highest rising positions of the left and right upper links 10 and 10 are common, and are not suitable. There is no left-right difference on the upper surface of the pillow 1 during use.

  Next, the operation of the pillow 1 when the head is placed on the upper surface of the central portion in the left-right direction of the pillow 1 to sleep in a supine posture will be described. In general, when sleeping in a supine posture, the back hits the futon and contacts the pillow 1 in the order of the neck and the back of the head. And as shown in FIG. 6, the shape of this pillow 1 exists in the position where the part which a neck contact | abuts is about 2-4 cm higher than the part which a back head contacts. Therefore, when trying to place the head on the pillow 1 in a supine posture, the head is first placed on the front side portion of the head mounting member 2 from the front side toward the rear side. Further, the upper surface of the pillow 1 and the upper links 10 and 10 are inclined upward. Therefore, a large load by the neck acts on the front side portions of the upper links 10, 10, particularly the front end portions. At this time, since the forward inclination angle of the front links 8 and 8 is larger than the forward inclination angle of the rear links 9 and 9, the forward inclination angles of the front links 8 and 8 and the rear links 9 and 9 are forwarded. Compared to the case where the same is, a large forward rotational moment acts on the front links 8 and 8. Therefore, the front links 8 and 8 are more likely to fall forward.

  When the front links 8 and 8 fall forward, the tensile force of the tension springs 17 and 17 acts as a repulsive force against this. One end of each of the tension springs 17 and 17 is fixed to the outside of the upper portion of the front links 8 and 8, and the other end is fixed to the second shaft 14 located near the rear end of the lower links 7 and 7. Yes. Therefore, when a load due to the head acts on the front side portions of the upper links 10 and 10, particularly in the vicinity of the front end portion, the repulsive force by the tension springs 17 and 17 against the forward collapse of the front links 8 and 8 is small. Since the tension springs 17 and 17 generate only a repulsive force that does not prevent the front links 8 and 8 from being smoothly tilted forward, the upper links 10 and 10 are easily displaced downward, and the upper surface of the head-mounted member 2 sinks. Since it is easy to fold, the pillow 1 on which the head is placed in a supine posture sinks smoothly. In addition, the pillow 1 sinking smoothly means that the repulsive force is small, and that the pillow 1 sinks at an appropriate speed due to the outflow of air from the vent hole 2b provided in the sealed head mounting member 2.

  In addition, this repulsive force can be adjusted by engaging the hexagon wrench with the adjustment part 14a, rotating the 2nd axis | shaft 14, and changing the extension length of the tension springs 17 and 17. FIG. In this way, by adjusting the tension length of the tension springs 17, 17, it is possible to adjust the repulsive force against the sinking when the head is placed on the pillow 1 in an upright posture. Yes. Further, since the tension length of the tension springs 17 and 17 separated from each other is adjusted by the single second shaft 14, the tension force of the left and right tension springs 17 and 17 is common, and the repulsive force is There is no difference.

  When the upper links 10 and 10 further sink, the upper links 10 and 10 come into contact with the tops of the conical springs 18 and 18, as shown in FIG. Thereafter, when the upper links 10 and 10 further sink, the upper links 10 and 10 act as urging forces that cause the urging forces of the conical springs 18 and 18 to be displaced upward. The urging force increases as the upper links 10 and 10 are displaced downward. On the other hand, when the upper links 10 and 10 are depressed so as to contact the tops of the conical springs 18 and 18, the decrease in the ratio of the upward component of the tensile force of the tension springs 17 and 17 becomes larger than the increase of the tensile force due to the elongation. The biasing force by which the tension springs 17 and 17 displace the upper links 10 and 10 upward is reduced. In this way, by adding the urging forces of the tension springs 17 and 17 and the conical springs 18 and 18, the upper links 10 and 10 come into contact with the tops of the conical springs 18 and 18 as shown in FIG. The force for displacing the upper links 10 and 10 while sinking downward is made substantially constant. With these structures, even if the height when lying on the back is changed, the repulsive force does not change greatly, and fluffy feeling can be prevented. The tension springs 17 and 17 exert an urging force so as to displace the upper links 10 and 10 upward in the forwardly raised state, but when the upper springs 10 and 10 enter the forwardly lowered state through the horizontal state. An urging force is applied so as to displace the.

  Examples of experiments are shown below. In this experimental example, the lengths of the lower links 7, 7, the front links 8, 8, the rear links 9, 9, and the upper links 10, 10 are 228 mm, 106 mm, 84 mm, and 251 mm, respectively. , 8 and the rear links 9 and 9 were tested using the urging device 4 alone with the forward inclination angles being 74 degrees and 85 degrees, respectively. First, the initial load required for displacing the upper links 10 and 10 downward from the initial state was measured by changing the acting part. As a result, the initial load is 3120 g when applied to the front ends of the upper links 10, 10, 4060 g when applied to the middle portion in the front-rear direction of the upper links 10, 10, and the rear of the upper links 10, 10. When it acted on the end, it was 4640 g. Also from this measurement result, it is easier to sink the upper links 10 and 10 when the load is applied to the front portions of the upper links 10 and 10 than when the load is applied to the center portion and the rear portion of the upper links 10 and 10. Is understood. Furthermore, the load required to maintain the position of the upper links 10, 10 was measured. As a result, in a state where the upper links 10 and 10 are lowered and are in contact with the conical springs 18 and 18, it is necessary to apply a downward load of 1150 g to the front end portions of the upper links 10 and 10. On the other hand, in the state where the upper links 10 and 10 are in the lowest lowered position, it is necessary to apply a downward load of 1210 g to the front ends of the upper links 10 and 10. Also from this measurement result, the repulsion that displaces the upper links 10 and 10 upward between the state in which the upper links 10 and 10 are in contact with the conical springs 18 and 18 and the state in which the upper links 10 and 10 are in the lowest lowered position. It is understood that the forces are almost the same.

  Thus, after the upper links 10 and 10 abut on the tops of the conical springs 18 and 18, the upper links 10 and 10 sink further against a substantially constant repulsive force. This repulsive force is smaller than the repulsive force from when the upper links 10, 10 start to sink until they come into contact with the tops of the conical springs 18, 18. Therefore, the upper links 10 and 10 can sink to the lowest position due to the weight of the head. However, as the upper links 10, 10 are lowered, the rear links 9, 9 fall forward, but the cam surfaces of the cams 19, 19 come into contact with the front surfaces of the rear links 9, 9, thereby The collapse of the links 9 and 9 is restricted. Therefore, the lowering of the upper links 10 and 10 is limited to the extent that the rear links 9 and 9 can fall down. When the rear links 9 and 9 are tilted, the adjusting portion 15a is engaged with a hexagon wrench to rotate the third shaft 15, and the cams 19 and 19 are rotated to come into contact with the rear links 9 and 9. It can be adjusted by changing the face. In this way, by adjusting the tilting of the rear links 9 and 9, it is possible to adjust the height of the pillow 1 when lying on its back. In this way, the pillow 1 is provided with a supine sleeping height adjustment means that adjusts the height of the upper links 10 and 10 when the person's head is placed on the supine in the supine position. The height of the pillow 1 when lying on its back is, for example, 1 cm to 5 cm. Further, as described above, the force that displaces the upper links 10 and 10 that have been sunk to the lowest position is kept small in the range in which the height is adjusted while lying on the back. There is no feeling or fluffiness. In addition, since the rotation of the cams 19, 19 separated from each other is adjusted by the single third shaft 15, the lowermost positions of the left and right upper links 10, 10 are common, and the pillow 1 when lying on its back There is no difference between the left and right sides of the top surface.

  Next, the operation of the pillow 1 when the head is placed on the upper surface of the central portion in the left-right direction of the pillow 1 to sleep in a sideways posture will be described. As shown in FIG. 8, since the difference in height between the temporal region and the shoulder is large when lying on its side, the load on the head acts on the center of the pillow 1 and part of the load on the head is in the neck. It is supported by the shoulder via The pillow 1 has an upper surface that is inclined upward. When the user tries to put his head on the pillow 1 while sleeping in a sideways position, the pillow is supported on the shoulder by the shoulder. The load on the front side of 1 is less likely to act directly. For this reason, since the forward rotational moment acting on the front links 8 and 8 that are likely to fall forward from the rear links 9 and 9 decreases, the front links 8 and 8 are difficult to fall forward. Moreover, since the upper links 10 and 10 on which the tension springs 17 and 17 act are supported by the rear links 9 and 9 that are closer to the vertical than the front links 8 and 8, the rear side is less likely to collapse than the front side. Since it has a structure, the upper links 10 and 10 are stably maintained in the highest position.

  In addition, this repulsive force changes the tension length of the tension springs 17 and 17 by engaging the hexagon wrench with the adjusting portion 14a and rotating the second shaft 14 according to individual differences such as physique and head weight. It can be adjusted by doing. In this way, by adjusting the tension length of the tension springs 17 and 17, the upper links 10 and 10 can be maintained at the highest position when lying down sideways. The height when sleeping in the sideways direction is due to the upper links 10 and 10 being maintained at the most elevated position by the tension springs 17 and 17. The uppermost position of the upper links 10 and 10 is adjusted by winding the belts 21 and 21 which are height adjusting means when lying in the horizontal direction around the shaft 13 so as to adjust the length of the upper links 10 and 10. The height of the pillow 1 when lying on its side is, for example, 7 cm to 15 cm. Furthermore, if the load for displacing the upper links 10 and 10 is less than the urging force of the tension springs 17 and 17, the upper links 10 and 10 can be maintained at the highest position. The height of the pillow 1 does not change due to slight fluctuations in the load acting on the top. Therefore, the height of the pillow 1 at the time of sleeping on the side is stabilized, and a fluffy feeling is not given to the user.

  Next, the operation of the pillow 1 when turning over from lying down and lying up will be described. When lying on its side, as described above, the upper links 10 and 10 are in the highest position. From this state, when the user takes out his shoulder and takes a supine posture, the upper links 10 and 10 sink to the lowest position as in the case of sleeping in the supine posture described above. As described above, even if the user turns over and turns into a lying posture from lying down, the upper links 10 and 10 are automatically displaced to a height adjusted so as to be suitable for lying on the supine and stop automatically. Can be obtained.

  Next, the operation of the pillow 1 when lying on its back from lying on its back will be described. At the time of lying on the back, as described above, the upper links 10 and 10 are in the lowest lowered position. From this state, when the user puts the shoulder portion and takes a horizontal posture, the head is temporarily supported by the shoulder portion, so that the load due to the weight of the head is applied to the upper links 10 and 10. Disappears or becomes very small. At this time, due to the restoring force of the conical springs 18, 18 and when the tension springs 17, 17 are in the front rising state from the horizontal state, the front links 8, 8 are raised by the tension force of the tension springs 17, 17, The upper links 10 and 10 are automatically displaced upward. Then, the upper links 10 and 10 are displaced to the most elevated position and automatically stop. In this way, even if the user turns over and turns into a sideways posture from lying on his / her back, the upper links 10 and 10 are automatically displaced to a height adjusted so as to be suitable for sleeping on the side and automatically stop. Can be obtained.

  By the way, when lying down from lying on the bedside, the user sometimes takes a sideways posture without moving his shoulders. Since this posture is unnatural and places a burden on the neck, it is preferable to promote a natural lateral posture with the shoulders inserted. Therefore, a natural lateral posture is promoted as follows.

  If the head is turned sideways without turning the shoulder from lying on its back, the head moves from the center in the left-right direction toward either the left or right side, as shown by the one-dot chain line in FIG. A part of the head is positioned above the aggregate sponge member 27. Therefore, a part of the load by the head is applied to the upper surface of the aggregate sponge member 27, and the head receives an upward restoring force by the aggregate sponge member 27. As described above, when a part of the head is positioned above the aggregate sponge member 27 and the head receives an upward restoring force by the aggregate sponge member 27, the head applied to the upper surface of the biasing device 4. Therefore, the upper links 10 and 10 are displaced upward by the restoring force of the tension springs 17 and 17 and the conical springs 18 and 18. Therefore, the height of the pillow 1 becomes higher than the height at the time of lying on the bed, the head rises and approaches a height suitable for a natural lateral posture in which the shoulder enters, so that the user inserts the shoulder. You can encourage them to take a natural sideways posture. When the shoulder portion is inserted, the pillow 1 rises to a height adjusted so as to be suitable for sleeping sideways, and takes a natural sideways posture.

  As described above, when the posture is changed by turning over, the upper links 10 and 10 are automatically displaced to automatically change the pillow 1 to an appropriate height, and the pillow when sleeping on its side and lying on its side. It is possible to independently adjust the height of 1 according to an individual's physique and the like. Therefore, the optimal posture can be taken both when sleeping on the side and when lying on the back, and comfortable sleep can be obtained.

  Further, the lying height adjustment means adjusts the height of the pillow 1 when lying on the back by changing the cam surfaces of the cams 19 and 19 and adjusting the lowest position of the upper links 10 and 10. Further, the sideways sleeping height adjusting means adjusts the height of the pillow 1 when lying sideways by changing the length of the belts 21 and 21 and adjusting the highest position of the upper links 10 and 10. To do. Therefore, both the height of the pillow 1 when sleeping on its back and sleeping on its side can be adjusted regardless of the weight of the head and the urging force. Since the cam surfaces of the cams 19 and 19 and the span lengths of the belts 21 and 21 do not depend on each other, the height of the pillow 1 can be adjusted independently when lying on its back and lying on its side.

  Further, the urging force of the tension springs 17 and 17 will cause the upper links 10 and 10 to be displaced downward by their own weight on the head when sleeping in the horizontal direction in order to maintain the upper links 10 and 10 in the highest position when lying down. It is sufficient if it is more than the force. If this condition is not satisfied, the second shaft 14 is rotated to adjust the urging force of the tension springs 17 and 17. Therefore, the ease of sinking when the head is placed on the pillow 1 in a supine posture can be freely adjusted according to personal preferences and the like.

  Further, by rotating the adjacent first shaft 13, second shaft 14, and third shaft 15 with a hexagon wrench, the height when lying sideways, the ease of sinking, and the height when lying on the back, respectively. Therefore, the operation unit for adjusting them is integrated in one place, and the operability is good.

  Further, when the head is placed on the center portion of the head-mounted member 2 formed of a molded body made of high-resilience urethane foam, the lower surface of the upper portion of the cavity 2a of the head-mounted member 2 is caused by the weight of the head from the metal member. It sinks over the upper surface of the rectangular link mechanism 6, 6. Furthermore, the head-mounted member 2, the covering cloth 5, the mesh cloth 23, the flexible sheet 25, and the sponge member 26 exist below the head and neck as viewed from above, and these are all formed of a soft member. The hard member does not exist. Therefore, when sleeping with the head on, the lower hard member is not sensed and uncomfortable, and a soft feel can be obtained. In addition, since there is no hard member below the head or neck, a soft feel can be obtained without increasing the thickness of the upper portion of the cavity 2a of the head-mounted member 2. In addition, since the soft feel can be obtained without using the thick head-mounted member 2 in the upper part of the cavity 2a, the height of the pillow 1 can be kept low.

  Hereinafter, a pillow according to a modification of the embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 9, in the pillow 1 </ b> A according to the modification of the embodiment of the present invention, the internal volume decreases and increases in the cavity 2 a of the head-mounted member 2 as the upper links 10 and 10 descend and rise. A bag body 28 is provided. The bag body 28 is provided so that the lower part of the inner surface is in close contact with the lower surface of the lower plate 22 and the upper part of the inner surface is in close contact with the upper surface of the upper plate 24 so as to surround the entire urging device 4. A hole 28a is formed through the rear side portion of the bag body 28, and the inside of the bag body 28 communicates with the outside of the head mounted member 2 through the vent hole 2b of the head mounted member 2, so that the bag The air inside the body 28 can flow into and out of the outside of the pillow 1A.

  In the pillow 1A configured as described above, as the upper plate 24 integrated with the upper links 10 and 10 is lowered, the air in the bag body 28 flows out through the holes 28a. However, since the amount of air outflow per unit time is limited by the size of the hole 28a, rapid lowering of the upper links 10 and 10 is limited. Therefore, when the user places his / her head on the head-mounted member 2, the upper links 7 and 7 sink, and the cam surfaces of the cams 19 and 19 come into contact with the rear links 9 and 9 so that the upper link 7. , 7 can be prevented from causing an impact on the head to the extent that sleep is disturbed when reaching the lowest position. Then, as the upper plate 24 integrated with the upper links 10 and 10 rises, air flows into the bag body 28 from the outside through the holes 28a, and the bag body 28 is again filled with air at the same atmospheric pressure as the outside. It is filled.

  Also in the other pillow 1B according to the modification of the embodiment of the present invention, as shown in FIG. 10, the internal volume decreases in the cavity 2a of the head-mounted member 2 as the upper links 10 and 10 are lowered and raised. An increasing bag 29 is provided. The bag body 29 is provided between the upper surfaces of the lower links 7 and 7 and the lower surfaces of the upper links 10 and 10 in a side view. The bag body 29 has a hollow bellows shape in which the lower surface is in close contact with the upper surface of the lower plate 22, and the upper surface is in close contact with the lower surface of the upper plate 24. A hole 29a is formed through the intermediate portion of the bag body 29, and the inside of the bag body 29 communicates with the outside of the head mounted member 2 through the vent hole 2b of the head mounted member 2, so that the bag body. The air inside 29 can flow in and out of the outside of the pillow 1B.

  In the pillow 1B configured as described above, as in the pillow 1A, the upper links 7 and 7 sink when the user places his head on the head-mounted member 2 so as to reach the lowest lowered position. When this happens, it is possible to prevent the occurrence of an impact on the head, which is an obstacle to sleep. As the upper links 10 and 10 are raised, air flows from the outside into the bag body 29 through the holes 29a, and the bag body 29 is filled again with air having the same atmospheric pressure as the outside.

  The shape of the bag body 29 is not limited to the bellows shape, and may be, for example, a cylindrical shape. Moreover, you may provide the two bag bodies 29 so that it may contact | adhere to the upper surface of each lower link 7 and 7, and the lower surface of each upper link 10 and 10, and it may respectively connect up and down.

  Further, when air flows in and out through the vent hole 2b formed in the head-mounted member 2, the volume of the cavity 2a decreases and increases as the upper links 10 and 10 are lowered and raised. Therefore, the head-mounted member 2 itself is regarded as a bag surrounding the urging device 4 and used on the head-mounted member 2 in the same manner as the pillows 1A and 1B by appropriately setting the number and size of the air holes 2b. When a person puts his head on his / her back, the upper links 7 and 7 sink and reach the lowest lowered position, so that it is possible to prevent the occurrence of an impact on the head so as to disturb sleep.

The external appearance perspective view of the pillow which concerns on embodiment of this invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. Partially broken top surface of pillow. The fragmentary top view of the biasing device of the pillow. The cut sectional view of the pillow at the time of lying on its back. The general | schematic longitudinal cross-sectional view of the pillow at the time of lying in the supine position adjusted highly. The schematic longitudinal cross-sectional view of the pillow at the time of lying on its back adjusted to be low. The schematic longitudinal cross-sectional view of the pillow at the time of lying down sideways. Sectional drawing of the pillow which concerns on the deformation | transformation of embodiment of this invention. Sectional drawing of the other pillow which concerns on the deformation | transformation of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A, 1B ... Pillow, 2 ... Head mounted member, 2a ... Cavity, 3 ... Lid member, 4 ... Biasing device, 6 ... Rectangular link mechanism, 7 ... Lower link, 8 ... Front link, 9 ... Rear side Link 10 upper link 11 lower connection member 12 upper connection member 13 first shaft 14 second shaft 15 third shaft 17 tension spring (first bias) Means), 18 ... conical spring (second biasing means), 19 ... cam, 20 ... wire, 21 ... belt, 22 ... lower plate, 23 ... mesh cloth, 24 ... upper plate, 25 ... flexible sheet, 26 ... Sponge member, 27 ... aggregate sponge member, 28, 29 ... bag, 28a, 29a ... hole.

Claims (7)

A flat rectangular parallelepiped head mounted member formed from a flexible member having a cavity inside;
A pillow having a biasing device provided in the cavity so as to bias and support the upper part of the cavity of the head-mounted member upward;
The urging device has a lower link extending horizontally in the front-rear direction, with the side where the neck is located in the state where the head of the person is placed on the head-mounted member as the front side and the side where the top of the head is located as the rear side, A front link having a lower end pivotably connected to a front end of a side link, a rear link having a lower end pivotally connected to a rear end of a lower link, and a front end to an upper end of the front link A rectangular link mechanism comprising an upper link in which a rear end portion is rotatably connected to an upper end portion of a rear link;
First biasing means for biasing the rectangular link mechanism so that the upper link is displaced upward;
A supine sleeping height adjustment means for adjusting the height of the upper link when the person's head is placed on the head-mounted member in the supine position, and
A sideways sleeping height adjustment means for adjusting the height of the upper link when the person's head is placed sideways on the head-mounted member,
The height adjustment means for lying on the side and the height adjustment means for lying on the side are the height of the upper link between when the person's head is placed on the head and the person is lying on the bed and when lying on the side. A pillow configured to be able to be adjusted independently. The height adjustment means at the time of lying on the back adjusts the lowest position of the upper link by adjusting the height of the abutting portion when the upper link is lowered,
The sideways sleeping height adjustment means adjusts the highest position of the upper link by adjusting the length of the flexible belt that spans between the upper link and one end fixed below the upper link. And
The upper link sinks down to the lowest position when the person's head is placed on the head on the head, and the upper link is placed when the person's head is placed on the head and placed on the side. The pillow according to claim 1, further comprising an adjusting unit that adjusts an urging force of the first urging unit such that the urging force is maintained at the highest position.   The lying height adjustment means has a cam pivotally supported on a shaft provided at the rear portion of the lower link, and a cam that contacts the rear link that rotates forward and falls forward. The pillow according to claim 2, wherein the lowest position of the upper link is adjusted by changing the surface.   The first biasing means is a tension spring having one end fixed to the outside of the upper portion of the front link and the other end fixed to the vicinity of the rear end of the lower link. The pillow according to any one of 3 above.   The pillow according to claim 4, wherein the urging device includes second urging means that urges the upper link upward when the upper link is lowered by a predetermined amount or more. The height adjustment means when lying on its back is a cam pivotally supported on a first shaft provided at the rear of the lower link, and one end is fixed to the cam and the other end is wound around a third shaft. The lower link position of the upper link is adjusted by changing the cam surface that contacts the rear link that falls forward by rotating the third shaft and rotating the cam via the wire. ,
The horizontal sleeping height adjusting means is a flexible body that is fixed around the first shaft, one end of which is fixed to the upper link and the other end of which is rotatable, and is bridged between the upper link and the first shaft. The belt has a belt, adjusts the belt length by rotating the first shaft, and adjusts the highest position of the upper link,
The first biasing means has one end side of the front link so that the top link is biased so that the highest position of the upper link is maintained when the person's head is placed sideways on the headrest member and lies down. A tension spring fixed to the outside of the upper portion and having the other end wound around and fixed to a rotatable second shaft, and the second shaft is rotated to adjust the urging force of the tension spring;
The pillow according to claim 1, wherein the first shaft, the second shaft, and the third shaft are provided adjacent to each other in the front-rear direction in the vicinity of the rear end portion of the lower link.   It has a through-hole, and when the air flows in and out through the hole, the internal volume decreases and increases as the upper link descends and rises. The pillow according to any one of claims 1 to 6.

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