JP2025007328A - User detection system, sensor device included in user detection system, and bed equipped with user detection system - Google Patents

Abstract

To additionally retrofit a user detection system or later remove the system to/from a bed that does not have the system.SOLUTION: A user detection system is a system for detecting a state of a user on a bed, and comprises: multiple sensor devices that detect a load of the user; and a monitoring control device that is electrically connected to the multiple sensor devices, receives signals from the multiple sensor devices and detects the state of the user. The user detection system is configured to be detachably attached to the bed in a retrofitting manner. Each sensor device is configured to be detachably attached to the bed by being suspended beneath the bottom of the bed. Each sensor device includes a pressing object part that is pressed by the load of the user and the pressing object part is inserted into a through hole for ventilation of the bottom.SELECTED DRAWING: Figure 4

Description

The present invention relates to a system for detecting a user's state, such as the user getting out of bed or the user's position on the bed, in a bed having multiple movable sub-bottoms, a sensor device included in the system, and a bed equipped with the system.

Related techniques are disclosed in, for example, Patent Documents 1 to 4.
The bed device disclosed in Patent Document 1 uses three pressure sensor units arranged at both ends and the center of the width of the back plate, and three pressure sensor units arranged at both ends and the center of the width of the fixed plate to determine whether the user's position on the bed is normal supine, at risk of falling, out of bed, in bed, or has fallen.

The user position detection device disclosed in Patent Document 2 has a number of bag-shaped cells arranged in the width and length directions of the air mat, and calculates the user's position on the air mat by detecting the air pressure difference between adjacent bag-shaped cells.

The bed exit confirmation device disclosed in Patent Document 3 has strip-shaped sensors that extend across the width of the bed in positions corresponding to the user's shoulders, lower back, and feet, located in the gap between the mattress and numerous butterfly springs that support the underside of the mattress. The strip-shaped sensors have tactile switches, and the outputs of these tactile sensors are used to detect the presence or absence of a person on the mattress and changes in body position.

The biometric measuring pamel disclosed in Patent Document 4 is a panel placed on the sleeping surface of a bed, has an elastically bendable receiving plate portion, has a strain gauge attached to the receiving plate portion, and measures the user's biometric information using the output of the strain gauge in response to vibrations in the center of the receiving plate portion.

JP 2008-100039 A JP 2017-000318 A International Publication No. WO 2012/053599 JP 2005-253957 A

The bed device described in Patent Document 1 is presumed to be equipped with a user detection system as standard from the time of shipment to detect the user's state, such as when the user gets out of bed or their position on the bed. Such beds are more expensive than beds that do not. However, whether or not a user detection system is required varies from user to user. Furthermore, even for the same user, whether or not the system is required varies depending on the health condition, care environment, etc. Therefore, it would be more convenient if a user detection system could be attached as an additional system to a bed that does not have one, and if it could be removed later.

In this case, it is preferable that the process of attaching and detaching the user detection system to the bed be as simple and quick as possible.

According to the above-mentioned conventional technology, the user detection system has a sensor device that responds to the weight or body movement of the user, and the sensor device is provided on the upper surface of the bottom that supports the mattress. However, if the sensor device protrudes above the upper surface of the bottom due to its thickness, there is a risk that the protruding sensor device will deteriorate the user's sleeping comfort.

Most beds equipped with user detection systems are nursing or medical beds. Many of these types of beds are equipped with multiple movable sub-bottoms that can be tilted to change the user's posture to different postures, such as lying down, sitting up, and legs up. It is also desirable for the user detection system to be able to flexibly adapt to such variations in the posture of the bottom, i.e., the posture of the user.

Users have different physiques. Bed bottoms also vary in length and width. It is desirable for the user detection system to be able to adapt to variations in user physiques and bed bottom sizes.

Therefore, one object of the present invention is to improve the convenience or adaptability of a user detection system for a bed.

A user detection system for a bed according to one embodiment disclosed herein includes a plurality of sensor devices that detect the load of a user and emit a signal corresponding to the load, and a monitoring control device that receives the signals from the plurality of sensor devices and detects the state of the user. The user detection system is configured so that it can be removably attached to the bed afterwards. The plurality of sensor devices are removably attached to a plurality of different positions in a plan view of the bed bottom in a manner that allows them to be suspended from the bottom of the bed.

According to one embodiment, the bottom has a plurality of through holes that penetrate the bottom in the thickness direction and can function as air vents. Each of the sensor devices has a pressed part that is pressed by the weight of the user. When each of the sensor devices is attached to the bottom, the pressed part is inserted into the through hole from below, and each of the sensor devices is configured to sense the weight of the user by the pressed part in the through hole being pressed by a mattress placed on the bottom.

According to one embodiment, when the sensor devices are attached to the bottom, the upper surface of the pressed part is located at the same height as or lower than the upper surface of the bottom so that the bottom surface of the mattress enters the through-hole due to the weight of the user, and the mattress presses the upper surface of the pressed part.

According to one embodiment, when the bottom has a greater number of through holes than the number of the sensor devices, the attachment position of each sensor device to the bottom can be changed by changing the through holes into which the pressing portions of each sensor device are inserted.

According to one embodiment, the bottom is a bottom having a mesh structure, and a plurality of meshes of the bottom having the mesh structure are used as the plurality of through holes. The user detection system according to claim 2 or 3.

According to one embodiment, the bottom is a flat bottom made of metal or resin, and the flat bottom has a plurality of ventilation holes, which are used as the plurality of through holes.

According to one embodiment, a fastener is provided for removably attaching the sensor device to the bottom, and the fastener is configured so that an operator can fasten the sensor device to the bottom using a screw or with a single touch.

According to one embodiment, the fixture has a snap-fit connection structure that allows an operator to fasten the sensor device to the bottom with a single touch.

According to one embodiment, the upper surface of the fastener is at the same height as or lower than the upper surface of the bottom.

According to one embodiment, the user detection system includes eight of the sensor devices, and two of the eight sensor devices are attached to each of four regions of the bottom that receive loads from the four parts of the back of the upper body, the lower back including the part from the lower back to the buttocks, the upper part of the lower legs including the part from the thighs to the knees, and/or the lower part of the lower legs including the part from the lower legs to the feet, when the user is lying on his/her back on the bed with his/her body stretched out straight and his/her height aligned with the longitudinal direction of the bed. The two sensor devices attached to each region of the bottom are respectively arranged in a first half region from the center of the width direction of each region of the bottom to one end of the width direction and a second half region from the center of the width direction of each region of the bottom to the other end of the width direction.

According to one embodiment, the bottom has four element bottoms: a back bottom supporting the back of the user, a waist bottom supporting the waist of the user, a knee bottom supporting the upper part of the lower leg of the user, and a foot bottom supporting the lower part of the lower leg of the user, and the angles of the back bottom, the knee bottom, and the foot bottom with respect to the horizontal are variable. The user detection system includes eight sensor devices, and two sensor devices selected from the eight sensor devices are attached to each of the four element bottoms. The two sensor devices attached to each element bottom are arranged in a first half region from the center of the width direction of each element bottom to one end of the width direction, and a second half region from the center of the width direction of each element bottom to the other end of the width direction, respectively.

According to one embodiment, each of the sensor devices has a support and a lever cover arranged on the upper side of the support. The lever cover has a fulcrum supported by the support and an extension part extending in one direction from the fulcrum in a plan view. The extension part is rotatable in the vertical direction around the fulcrum and is elastically lifted from the support. The lever cover has the pressed part on the upper part of the extension part. Each of the sensor devices is arranged so that the one direction in which the extension part extends is along the width direction of the bottom and the pressed part is located closer to the center of the width direction of the bottom than the fulcrum in a plan view.

According to one embodiment, each of the sensor devices has a cushion disposed below the extension of the lever cover, and a pressure sensor disposed above the support and below the cushion. When the pressure-receiving portion is pressed downward by the user's weight, the lever cover descends and applies pressure to the pressure sensor via the cushion member, and the pressure sensor outputs a signal according to the pressure.

According to one embodiment, the bottom has two or more through holes arranged at different positions in the width direction of the bottom. Each of the sensor devices has two or more pressed parts arranged at an upper part of the extension part at different positions in the one direction in which the extension part extends in a plan view. When each of the sensor devices is attached to the bottom, the two or more pressed parts are inserted into the two or more through holes arranged in the width direction of the bottom.

According to one embodiment, the lever cover of each sensor device covers the entire upper area of the support from above.

According to one embodiment, the monitoring and control device is positioned below the waist bottom.

According to one embodiment, the bed includes a bottom drive system that drives one or more of the bottom elements. The monitoring and control device is connected to the plurality of sensor devices and the bottom drive system, and detects the state of the user based on the signals from the plurality of sensor devices and signals related to the drive of the bottom elements from the bottom drive system.

According to one embodiment, each of the plurality of sensor devices has a pressurized portion that is pressed by the load of the user, and one pressure sensor that detects the load of the user via the pressurized portion. The pressurized portion is inserted into a through hole that penetrates the bottom in the thickness direction. Each of the sensor devices is configured to detect the load of the user by pressing the pressurized portion.

According to one embodiment, the bed has a mattress placed on the bottom. The mattress bulges into the through hole due to the weight of the user, thereby pressing the pressed portion.

FIG. 1 is a perspective view of a bed equipped with a user detection system according to an embodiment of the present invention. 1A, B, C are plan and side views of the bed shown in FIG. A diagram explaining the movable state of the bed bottom FIG. 1 is a schematic diagram showing the layout of each part of a user detection system. FIG. 1 shows a state in which the sensor device is attached to the bottom of the element. A perspective view of a sensor device AA cross-sectional view of FIG. FIG. 1 is a diagram illustrating the arrangement of a cushioning material and a pressure sensor of a sensor device. A diagram showing the sensor device attached to the mesh bottom. FIG. 13 is a cross-sectional view of the sensor device attached to the mesh bottom along a second direction. FIG. 13 is a diagram showing an example of a control flow of a monitoring control device. FIG. 1 shows an embodiment of a modified fixing device. FIG. 1 shows a first modified example of an element bottom. FIG. 2 shows a second modified example of the element bottom. FIG. 13 shows a third modified example of the element bottom. FIG. 4 is a diagram showing a fourth modified example of the element bottom.

The present embodiment will be described below with reference to the drawings. The bed 1 according to this embodiment shown in Figs. 1 and 2 is substantially rectangular in plan view.

In the following description, the term "length direction" means the direction along the long side of the rectangle of bed 1, "width direction" means the direction along the short side of bed 1, and "height direction" means the vertical direction when bed 1 is placed on a level floor. Additionally, "head direction" means the direction from the feet to the head as seen by the user when the user is lying on his/her back on bed 1, "head side" means the side closer to the user's head, "foot direction" means the direction from the user's head to the feet, "foot side" means the side closer to the user's feet, and "front", "rear", "left" and "right" mean the directions or sides of the front, back, left and right as seen by the user.

The bed 1 according to this embodiment comprises a base frame 11, a center frame 12, a head frame 13, and a foot frame 14. The base frame 11 is substantially rectangular in plan view, and is placed on the installation floor surface via casters 15 (or fixed feet, not shown) provided at its four corners.

A center frame 12, a head frame 13, and a foot frame 14 are mounted on top of the base frame 11. The head frame 13 is positioned on the head side of the center frame 12 and the two are connected to each other, and the foot frame 14 is positioned on the foot side of the center frame 12 and the two are connected to each other. In this way, the center frame 12, the head frame 13, and the foot frame 14 are mutually connected to each other to form a single lifting frame 12, 13, 14 that is approximately rectangular in plan view as a whole.

The lifting frames 12, 13, and 14 (for example, the center frame 12) are connected to a lifting mechanism 16 provided on the base frame 11, and can be raised and lowered in the height direction by the lifting mechanism 16.

The bottom 2 is placed on the lifting frames 12, 13, and 14. The bottom 2 is a plate that is approximately rectangular in plan view and supports a mattress (not shown) that is placed on top of it. The bottom 2 has a number of approximately rectangular, flat, element bottoms that are placed at different positions in the length direction. These element bottoms are, for example, a back bottom 21, a waist bottom 23, a knee bottom 25, and a foot bottom 27, in that order from the head side to the foot side.

Figure 3 is a diagram explaining the movable state of each element bottom. The back bottom 21 is for supporting the upper body of the user, for example, the back. The back bottom 21 includes, for example, an upper back bottom 21A and a lower back bottom 21B arranged on the foot side of the upper back bottom 21A. The upper back bottom 21A and the lower back bottom 21B are rotatably linked to each other via a back bending hinge 21C at the foot side end of the upper back bottom 21A and the head side end of the lower back bottom 21B. The back bottom 21 (the lower back bottom 21B) is rotatably linked to the lifting frames 12, 13, 14 via a back raising hinge 24 at its foot side end.

The upper back bottom 21A is intended to support a relatively high portion of the user's upper body (e.g., the area from the head to the shoulder blades). The lower back bottom 21B is intended to support a relatively low portion of the user's upper body (e.g., the area from the shoulder blades to the upper waist).

The back bottom 21 is connected to a back-raising mechanism (not shown) provided on the lifting frames 12, 13, and 14, for example, and can be rotated as a whole around the back-raising hinge 24 by the back-raising mechanism, allowing it to assume a variety of positions from a horizontal position to a position tilted forward by a predetermined angle. This allows the user's upper body to be raised or laid down. Note that Figures 3(A) and (B) show examples of the change in angle of the back bottom 21 due to rotation.

The upper back bottom 21A and the lower back bottom 21B of the back bottom 21 are connected to the back-raising mechanism (or a separate back bending mechanism), and this mechanism allows the upper back bottom 21A to rotate around the back bending hinge 21C relative to the lower back bottom 21B (rotation state not shown), allowing the user to take on a variety of postures ranging from a flush posture to a posture bent forward by a predetermined angle. This allows the posture of the user's upper body (spine) to be adjusted between a straight posture and a posture leaning forward to a certain degree.

The longitudinal position of the back bending hinge 21C that links the upper back bottom 21A and the lower back bottom 21B is variable within a predetermined distance range, and can be set to any of a number of different positions, for example (not shown). This allows the position of the back bending hinge 21C, i.e., the position at which the user bends their back, to be adjusted to suit the user's physique and physical characteristics.

The waist bottom 23 is intended to support the user's hips, for example the area from the lower back to the buttocks (lumbar region). The waist bottom 23 is fixed horizontally to the lifting frames 12, 13, and 14, for example.

The knee bottom 25 is for supporting the user's upper leg, for example, from the thigh to the knee. The knee bottom 25 is rotatably linked at its head end to the lifting frames 12, 13, 14 via a knee-raising hinge 28. The knee bottom 25 is connected to a knee-raising mechanism (not shown) provided on the lifting frames 12, 13, 14, for example, and can be rotated around the knee-raising hinge 28 by the knee-raising mechanism to assume a variety of positions from a horizontal position to a position tilted forward by a predetermined angle. This allows the user to raise their knee to bend the knee joint, or lower their knee to straighten the knee joint.

The foot bottom 27 is for supporting the part of the user from the knee to the foot (lower part of the leg). The knee bottom 25 and the foot bottom 27 are rotatably linked to each other via the knee bending hinge 26 at the foot end of the knee bottom 25 and the head end of the foot bottom 27. The foot end of the foot bottom 27 is placed on the lifting frames 12, 13, and 14 in a state in which it can slide in the length direction. When the knee bottom 25 rotates around the knee lifting hinge 28 by the knee lifting mechanism, the foot bottom 27 also rotates around the knee bending hinge 26. Note that Figures 3(A) and (B) show an example of the change in angle between the knee bottom 25 and the foot bottom 27 due to rotation.

Alternatively, the foot bottom 27 may be coupled to a foot-raising mechanism provided on the lifting frames 12, 13, 14, so that the foot-raising mechanism can rotate the foot bottom 27 about the knee bending hinge 26 to adjust the height of the user's feet (not shown).

The longitudinal position of the knee bending hinge 26 is variable within a predetermined distance range, and can be set to any of a number of different positions (not shown). This allows the position of the knee bending hinge 26, i.e., the position at which the user's knee is bent, to be adjusted to suit the user's physique, physical characteristics, etc.

The back bottom 21, the waist bottom 23, the knee bottom 25, and the foot bottom 27 may each be configured so that their length and/or width dimensions are variable (the specific configuration for varying dimensions is not shown, but publicly known technology can be used).

The position of each element bottom can be controlled by the user or caregiver using a control panel or remote controller (not shown) provided on the bed 1.

Each of the bottom elements, such as the back bottom 21, the waist bottom 23, the knee bottom 25, and the foot bottom 27, has, for example, a mesh structure. A bottom element of the mesh generally has an outer frame 31 that is relatively thick and highly rigid and is shaped in a substantially rectangular shape in a plan view, a number of thin and long vertical wires 33A stretched in the length direction with a space between them inside the outer frame 31, and a number of thin and long horizontal wires 33B stretched in the width direction with a space between them inside the outer frame 31. The vertical wires 33A and horizontal wires 33B cross each other to form a mesh structure. Such a bottom element of the mesh has a large number of meshes (i.e., through holes 35 that penetrate the bottom in the thickness direction from its upper surface to its lower surface) arranged in a matrix in the length direction and width direction.

The bed 1 is equipped with a user detection system 4 that includes multiple sensor devices 5.

The user detection system 4 for the bed 1 according to this embodiment will be described below. Figure 4 is a schematic diagram showing an example of the arrangement of each part of the user detection system 4. Figure 5 is a diagram showing an example of the attachment state of the sensor device 5 to each element bottom (representatively, the back bottom 21 is shown).

The bed 1 according to this embodiment does not need to be equipped with the user detection system 4 at the time of shipment. After shipment, the user detection system 4 can be additionally attached to the bed 1 as an optional item in a detachable manner. Furthermore, once the user detection system 4 has been attached to the bed 1, it can also be removed from the bed 1. The task of attaching and detaching the user detection system 4 to and from the bed 1 is simple, requiring an operator to simply tighten and loosen a fixing screw with a screwdriver, or to attach and detach with a single touch, and can be completed in a short time.

The user detection system 4 has multiple sensor devices 5 (eight in the illustrated example) and at least one monitoring control device 6 electrically connected to the sensor devices 5.

The monitoring and control device 6 may be electrically connected to a nurse call system 9. The nurse call system 9 will be described later.

The monitoring and controlling device 6 may further be electrically connected to a bottom driving system including several mechanisms for changing the posture of the bottom 2 of the bed 1, such as the above-mentioned back-raising mechanism, back bending mechanism, and knee-raising mechanism, and a bottom driving control device 7 that drives and controls them (for example, to the bottom driving control device 7 in this embodiment).

The eight sensor devices 5 basically have the same configuration, but may be different. Each sensor device 5 senses the load applied by the user to the upper surface of each element bottom through the mattress (not shown) and outputs an electrical signal indicating a value corresponding to that load. The specific configuration will be described later.

The following will be explained with reference to FIG. 4. The eight sensor devices 5 are paired in pairs of two sensor devices 5 to form four pairs of sensor devices 5. These four pairs of sensor devices 5 are attached to the bottom 2 in the following arrangement in a plan view. That is, when the user is lying on his/her back on the bed 1 with his/her body stretched out straight and his/her height aligned with the longitudinal direction of the bed 1, the four pairs of sensor devices 5 are attached to four areas of the bottom 2 that receive loads from four parts of the user's back of the upper body, the lower back including the part from the lower waist to the buttocks, the upper part of the lower legs including the part from the thighs to the knees, and/or the lower part of the lower legs including the part from the lower legs to the feet.

The pair of sensor devices 5 attached to each of the above-mentioned regions of the bottom 2 are disposed in the right half region extending from the center in the width direction of each of the above-mentioned regions of the bottom 2 to one end in the width direction, and in the left half region extending from the center in the width direction of each region to the other end in the width direction. A gap is provided between the pair of sensor devices 5, and the center in the width direction of the bottom 2 is located within that gap. No sensor device 5 is disposed in the space between the gaps.

One example of such four pairs of sensor devices 5 is shown in FIG. 4. That is, the four pairs of sensor devices 5 are attached to the four element bottoms, namely, the back bottom 21, the waist bottom 23, the knee bottom 25, and the foot bottom 27. For example, the first pair of sensor devices 5(a), 5(a) is attached to the back bottom 21, the second pair of sensor devices 5(b), 5(b) is attached to the waist bottom 23, the third pair of sensor devices 5(c), 5(c) is attached to the knee bottom 25, and the fourth pair of sensor devices 5(d), 5(d) is attached to the foot bottom 27. Here, it is preferable that the first pair of sensor devices 5(a), 5(a) is attached to, for example, the lower back bottom 21B of the upper back bottom 21A and the lower back bottom 21B of the back bottom 21. This is because the lower back bottom 21B often receives a larger load from the user than the upper back bottom 21A.

In this way, by arranging four pairs of sensor devices 5 (i.e., a total of eight sensor devices 5) on the bottom 2, it is possible to appropriately detect the user's state, such as his/her posture and attitude on the bed 1. In other words, without the need to use too many sensor devices 5, with a moderate number of sensor devices 5, eight, which is neither too many nor too few, it is possible to determine whether the user's state is normal, requires caution, or is dangerous with a practically sufficient resolution. In addition, by arranging four pairs of sensor devices 5 (i.e., a total of eight sensor devices 5) on the bottom 2 as described above, it is possible to determine whether the user's state is normal, requires caution, or is dangerous even when the bottom 2 is in a bent position that is not horizontal due to bottom driving such as lifting the back or knees.

The sensor devices 5 of each pair may be arranged, in a plan view, basically in positions that are symmetrical about the center line CL of each element bottom in the width direction. For example, one sensor device 5(a) of the first pair may be arranged in a range between a position shifted a predetermined distance to the left from the center line CL of the back bottom 21 in the width direction to the left end of the back bottom 21, and the other sensor device 5(a) may be arranged in a position range that is symmetrical to the right of the sensor device 5(a).

Similarly, the other three pairs of sensor devices 5 may be arranged in line-symmetrical positions on the left and right sides of the center line CL in the width direction of each element bottom. Depending on the user's physique, behavioral patterns, and other environmental conditions, each pair of sensor devices 5 may be arranged in a position slightly shifted in the length or width direction from the line-symmetrical positions as described above.

The following description will be given with reference to FIG. 5. For example, as shown in FIGS. 5(A) and (C), the first pair of sensor devices 5(a), 5(a) can vary the distance (spacing) between them in the width direction of the bottom 2, that is, the distance from the center line CL to each sensor device 5(a), 5(a) can be varied. Also, as shown in FIGS. 5(A) and (B), the first pair of sensor devices 5(a), 5(a) can also vary their longitudinal positions on the back bottom 21. In other words, the arrangement of each sensor device 5(a), 5(a) on each element bottom can be appropriately adjusted as necessary, depending on the patient's physique and condition (e.g., medical condition). Note that, for the sake of simplicity, only the first pair of sensor devices 5(a), 5(a) has been described above, but it goes without saying that the same is true for all sensor devices 5 in the user detection system 4.

Return to FIG. 4. The monitoring control device 6 is placed in an empty space below the bottom 2. For example, the monitoring control device 6 can be placed in an empty space below the waist bottom 23. This is because an empty space suitable for a storage location is easily formed below the waist bottom 23, and the waist bottom 23 is fixed and does not rotate, making it easy to store. This arrangement also allows the monitoring control device 6 and all (eight in the illustrated example) sensor devices 5 to be placed at an appropriate distance. For example, if the monitoring control device 6 and each sensor device 5 are connected by wire (the wiring is shown by dotted lines in the illustrated example), it is easy to organize the wiring, and there is no need to provide extremely long or short wiring, and it is sufficient to set the wiring to approximately the same length. The monitoring control device 6 may be stored in another empty space in the bottom 2, or in another location such as next to the bed 1.

<Structure of the sensor device>
Next, the structure of the sensor device 5 will be described with reference to the drawings. Fig. 6 is a perspective view of the sensor device 5. Fig. 7 is a cross-sectional view taken along line A-A in Fig. 6, and Fig. 8 is a diagram illustrating the arrangement of the cushioning material 72 and the pressure sensor of the sensor device 5. Fig. 9 is a diagram illustrating the state in which the sensor device 5 is attached to a bottom element (waist bottom 23) having a mesh structure. Fig. 10 is a cross-sectional view of the sensor device 5 attached to the bottom 2 having a mesh structure taken along the second direction.

The sensor device 5 has, for example, an elongated, generally rectangular parallelepiped shape as a whole. In the following description, the term "first direction" refers to the longitudinal direction of the sensor device 5 in a plan view, and the term "second direction" refers to the transverse direction of the sensor device 5 in a plan view.

The sensor device 5 is attached to one of the element bottoms of the bed 1 in a position in which its first direction coincides with the width direction of the bed 1.

The sensor device 5 has a support 51 and a lever cover 52. Both the support 51 and the lever cover 52 are, for example, elongated boxes that are approximately rectangular parallelepipeds. The support 51 is, for example, a box having a bottom wall 51a and a side wall 51b, and an open top part 51c without a top wall. The lever cover 52 is, for example, a box having a top wall 52a and a side wall 52b, and an open bottom part 52c without a bottom wall. In both the first direction and the second direction, the size of the lever cover 52 is larger than the size of the support 51. The part of the support 51 that includes the open top part 51c is completely contained within the opening of the bottom part 52c of the lever cover 52, and the open top part 51c of the support 51 and the upper part of the side wall 51b around it are covered from the outside by the top wall 52a of the lever cover 52 and the side wall 52b around it.

The support 51 has four arms 53 that extend outward in the second direction from two points on both sides near one end in the first direction and two points on both sides near the other end. These four arms 53 function as part of a fixing device for attaching the sensor device 5 to the element bottom.

That is, each of the four arms 53 has a female screw hole formed downward from its top surface. Two fixing plates 54 are further provided as other parts of the fixture. One fixing plate 54 is for connecting with the two arms 53 extending from both side surfaces near the one end, and has through holes 54a in two locations corresponding to the female screw holes (not shown) of the two arms 53. The other fixing plate 54 is for connecting with the two arms 53 extending from both side surfaces near the other end, and has through holes 54a in two locations corresponding to the female screw holes of the two arms 53.

The lever cover 52 of the sensor device 5 has a protrusion 56 as a pressed part that is pressed by the user's weight. Specifically, for example, the lever cover 52 has a plurality of mesa-shaped (i.e., plateau-shaped with a flat upper surface) protrusions (pressed parts) 56 arranged in a row in the first direction on the upper part of its top wall 52a. Each protrusion 56 is square or rectangular in plan view, and this shape is selected so that it can be inserted from below into each mesh (through hole 35) of the element bottom and accommodated therein. In the upper part of the top wall 52a of the lever cover 52, there is a recessed groove 57 adjacent to each protrusion 56. The width and depth of each groove 57 are selected so that it can accommodate the vertical wires 33A or horizontal wires 33B that define each mesh of the element bottom.

As a result, the multiple mesa-shaped protrusions 56 arranged in the first direction of the lever cover 52 of the sensor device 5 are accommodated inside the multiple meshes (through holes 35) arranged in the width direction of the element bottom. The upper surfaces of these protrusions (pressed parts) 56 are located at the same height as the upper surface of the element bottom, that is, at a lower height than the upper surface of the vertical wire 33A arranged on the horizontal wire 33B in this embodiment. For example, it is desirable that the height of the upper surface of the protrusions 56 is the same as the height of the upper surface of the vertical wire 33A or slightly lower (for example, a few tenths of a millimeter). Therefore, the upper surface of the sensor device 5 does not protrude higher than the upper surface of the element bottom. Therefore, the sensor device 5 does not affect the user's sleeping comfort. On the other hand, when the weight of the user is applied to the mattress (not shown) on the bottom, the mattress enters the mesh (through holes 35) of the element bottom and bulges downward, pressing downward against the convex portion 56 of the lever cover 52, so that the weight of the user is applied from the mattress to the lever cover 52 of the sensor device 5. The sensor device 5 can detect this load. It is also desirable that the upper surface of the fixing tool does not protrude above the upper surface of the bottom. Specifically, it is desirable that the upper surface of the fixing plate 54 is located at the same level as or lower than the upper surface of the element bottom. This prevents the way in which the sensor device 5 is attached from adversely affecting the user's sleeping comfort.

The internal structure of the sensor device 5 for detecting the load is described below.

For example, as shown in FIG. 7, the sensor device 5 has a pressure sensor 71, a cushioning material 72, and an elastic member between the support body 51 and the lever cover 52.

The lever cover 52 has a support rod 58 protruding downward at a location near one end of the lower surface of the top wall 52a in the first direction. The lower end 58a of the support rod 58 abuts against one location on the bottom wall 51a of the support body 51. An elastic member, for example, a coil spring 73, is inserted between a location near the other end of the top wall 52a of the lever cover 52 in the first direction and a location on the bottom wall 51a of the support body 51 located directly below that location. The coil spring 73 lifts the lever cover 52 upward and elastically supports it. As a result, in the lever cover 52, the extension portion 59 extending from the lower end 58a of the support rod 58 toward the other end in the first direction in a plan view is not in direct contact with the support body 51 and floats above the support body 51. Therefore, the lever cover 52 is supported on the support body 51 in a state in which it can swing up and down like a seesaw, with the lower end 58a of the support rod 58 as a fulcrum.

A pressure sensor 71 is installed on the upper surface of the bottom wall 51a of the support 51, between the fulcrum (lower end 58a in the illustrated example, the same below) in the first direction in a plan view and an elastic member (coil spring 73 in the illustrated example, the same below).

8, a cushioning material 72 is inserted between the upper surface of the pressure sensor 71 and the lower surface of the top wall 52a of the lever cover 52. For example, the cushioning material 72 may be fixed to the lower surface of the top wall 52a of the lever cover 52 by adhesive or other methods, or may be fixed to the upper surface of the pressure sensor 71 on the support body 51 side, or may be configured not to be fixed to any member and to be inserted by the user between the upper surface of the pressure sensor 71 and the lower surface of the top wall 52a of the lever cover 52.

The pressure sensor 71 is, for example, a flat thin plate attached to the bottom wall 51a of the support body 51, and converts the pressure applied to its upper surface into an electrical signal having a value corresponding to the pressure value and outputs it. The output signal of the pressure sensor 71 is input to the monitoring and control device 6.

The cushioning material 72 is located between the lever cover 52 and the pressure sensor 71, and absorbs the mechanical shock that the lever cover 52 applies to the pressure sensor 71. The cushioning material 72 is made of a soft elastic material such as silicone rubber.

When a downward load is applied from above to any of the protrusions 56 of the extension 59 of the lever cover 52 of the sensor device 5 configured in this manner, the extension 59 of the lever cover 52 rotates about the fulcrum and descends, pressing against the pressure sensor 71 via the cushion material 72. The pressure sensor 71 provides the monitoring and control device 6 with an electrical signal having a value corresponding to the pressing force. When the pressure applied to the pressure sensor 71 is removed, the lever cover 52 returns to its original position due to the action of the elastic member (e.g., coil spring 73), and the output signal from the pressure sensor 71 indicates zero pressure. Note that the elastic member is not shown in Figure 8.

The sensor device 5 detects the load applied by the user anywhere in the widthwise range of the bed 1 across almost the entire length in the first direction (i.e., on any of the multiple protrusions 56). Despite the wide widthwise range that can be detected, each sensor device 5 only requires one pressure sensor 71, making it low cost.

The sensor device 5 is attached to the bottom 2 in such a position that the point of action of the lever cover 52 (the part that presses the pressure sensor 71) is located toward the center of the width of the bottom element (i.e., close to the center line CL) and the fulcrum of the lever cover 52 is located toward the right or left end of the bottom 2 (i.e., away from the center line CL).

By mounting the sensor device 5 on the bottom 2 in this position, the state of the user on the bottom 2 can be detected more reliably than when the sensor device 5 is mounted in the opposite position. This is because the user is often positioned near the center of the bottom 2. Therefore, in the lever cover 52 of the sensor device 5 mounted in the above position, the load from the user is often applied to a location relatively far from the fulcrum, that is, a location closer to the center of the bottom 2. The movement stroke of the lever cover 52 required to activate the pressure sensor 71 is relatively long in a location relatively far from the fulcrum, so the accuracy of load detection is also relatively good.

The monitoring control device 6 inputs output signals from the eight sensor devices 5 and an output signal from the bottom drive control device 7, and estimates the state of the user on the bed 1. The state of the user that can be determined includes, for example, whether the user is lying on the bed 1 or sitting upright, whether the user is sitting on the edge of the bottom 2 in the width direction (edge sitting position), whether the user is sleeping near the edge of the bed 1 in the width direction (whether there is a risk of falling), whether the user has stood up and left the bed 1 (whether the user has left the bed), whether the user has remained out of bed for a long period of time, etc.

Furthermore, it may be possible to determine whether the upper body of the user falls to the right, left, or forward when the back bottom 21 is upright, or whether the user's buttocks slide forward beyond the waist bottom 23 while the back bottom 21 is being moved from a lying down state to an upright state. The variations in the user state that are determined may be other than those described above, or may be more or less than those described above.

Alternatively, the monitoring control device 6 may not be connected to a bottom drive system such as the bottom drive control device 7, and may not need to make decisions that take into account the angle or movement of the bottom 2.

The monitoring and control device 6 sends a signal according to the estimated result of the user's state to the nurse call system 9 via wired or wireless communication, thereby notifying the nurse or caregiver of information useful for user care (for example, whether the user is lying normally on the bed 1, whether there is a risk of falling off the bed 1, whether the user is on the bed or not, whether the body is abnormally tilted when sitting with the upper body upright, etc.).

The nurse call system 9 includes, for example, a handset 91 installed near the bed 1 and a parent unit 92 installed in a nurse's station or the like, but may also be connected to or include a mobile communication terminal 90 carried by a nurse or caregiver, and there may be various variations in the specific configuration. In the illustrated example, the monitoring and control device 6 is connected to the handset 91 of the nurse call system 9, and a signal from the monitoring and control device 6 is sent to the parent unit 92 via the handset 91.

11 shows an example of the flow of control by the monitor and control device 6. The flow will be described below.
The monitoring control device 6 inputs signals output from the eight sensor devices 5 and, based on the input signals, determines the distribution of the user's load on the bottom 2 (for example, which sensor device 5, i.e., which position of which element of the bottom the user's load is being applied to, or the magnitude of pressure being applied to each sensor device 5, etc.) (S1).

The monitoring control device 6 also receives a signal output from the bottom drive control device 7, and based on the received signal, grasps the posture of the bottom 2 (for example, various postures determined by a combination of the inclinations of multiple bottom elements, and the transition from one posture to another, etc.) (S2).

Next, the monitoring and control device 6 inferentially determines whether the user is currently in the bed 1 based on the determined load distribution and the posture of the bottom 2 (S3).

Next, based on the result of the determination in S3, the monitoring and control device 6 transmits predetermined information or signals to the nurse call system 9 or the mobile communication terminal 90 as necessary (S4).

The monitoring and control device 6 repeats the above steps (S1 to S4).

<Attaching the sensor device to the bed>
When mounting the sensor device 5 on the element bottom, the following procedure can be carried out.

The sensor device 5 is placed under the element bottom by an operator, and the upper surfaces of the four arms 53 of the sensor device 5 are abutted against the lower surfaces of the two horizontal wires 33B of one element bottom. Two fixing plates 54 are placed on the upper side of the element bottom, and the two fixing plates 54 are abutted against the upper surfaces of the two horizontal wires 33B. Four fixing screws (not shown) are then inserted from above into the four through holes 54a of the two fixing plates 54, and the fixing screws are inserted into the female screw holes (not shown) of the four arms 53, and the fixing screws are tightened with a screwdriver operated by an operator. As a result, the two horizontal wires 33B of the element bottom are firmly sandwiched between the two fixing plates 54 and the four arms 53, and the sensor device 5 is firmly fixed to the element bottom in a hanging form.

This installation is easy and can be done quickly since the worker only needs to use a screwdriver.

It is preferable that the thickness of the fixing plate 54 is selected so that the upper surface of the fixing plate 54 does not extend above the upper surface of the element bottom (i.e., is located at the same level as or slightly below the upper surface of the element bottom).

<Modifications of sensor device and fixture>
A modified example of the fastener will be described. FIG. 12 is a diagram showing one embodiment of a modified example of the fastener. In order to further simplify the fastening operation, the fastener may adopt, for example, a snap-fit connection structure as follows. Here, the snap-fit connection structure means a connection structure that utilizes an elastic member, and when a person pushes or pulls a certain part of the structure in one direction from a state in which the parts that can be connected to each other are separated, the connection of the parts that can be connected is completed. An example of a snap-fit connection structure is a structure in which two members approach each other in one direction, at least one of the members is elastically deformed and engages with the other member, and after the engagement, the deformed member elastically returns to its original shape to maintain the engagement, as described below.

In this example, the fixing device has a fixing plate 154 with two locking projections 155 extending downward from the underside near both ends. The locking projections 155 have spring properties and will bend when subjected to a bending force, and will return to their original straight shape when the force is removed. The tip 155a of the locking projections 155 has a tapered shape with a jaw, for example, like a harpoon. The outer surface of the jaw of the tip 155a of the locking projection 155 has an inclined surface 155b that is inclined in the direction in which the locking projection 155 extends. Locking holes 153a are provided near the tip of each arm 153, penetrating vertically. Each locking hole 153a has a shape and size that allows the tip 155a of each locking projection 155 to be inserted through.

The distance between the two locking projections 155 and the distance between the two locking holes 153a are appropriately selected. This allows the fixing plate 154 to engage with the arm 153 as follows:

In other words, when the worker positions the fixed plate 154 directly above the two arms 153 and then lowers the fixed plate 154 toward the arms 153, the tip ends 155a of the two locking projections 155 of the fixed plate 154 enter into the two locking holes 153a of the two arms 153, and the inclined surfaces 155b of the tip ends 155a of the two locking projections 155 each come into contact with the inner surfaces of the two locking holes 153a.

When the operator then lowers the fixed plate 154 further, the two locking protrusions 155 bend due to their springiness, and the tip ends 155a of each pass through the two locking holes 153a. When the tip ends 155a of the two locking protrusions 155 completely pass through the two locking holes 153a, the locking protrusions 155 return to their original straight shape due to their springiness, and the tip ends 155a of the locking protrusions 155 engage with the locking holes 153a.

By adopting a snap-fit connection structure that allows the fixing plate 154 to be fixed to the arm 153 with a single touch, the sensor device 5 can be attached to the element bottom very easily and quickly. The arrangement of the locking projection 155 and the locking hole 153a may be reversed from that described above, that is, the locking projection 155 may be provided on the arm 153, and the locking hole may be provided on the fixing plate 154.

With the sensor device 5 attached to the bottom of the bottom 2 in this manner, even if water splashes on the sensor device 5 from above the bottom 2, for example, if a drink is spilled on the bed 1, if the user has incontinence, or when wiping the bed, water will hardly penetrate inside the sensor device 5. This is because, as described above, the lever cover 52 covers the top and surrounding area of the support 51 from the outside.

All or part of the element bottom may have a structure of a different type than the mesh described above. For example, it may be a flat plate type structure made of synthetic resin or metal. A flat plate type element bottom is described below.

Figure 13 shows a first modified example of the bottom elements. Each of the bottom elements, such as the back bottom, waist bottom, knee bottom, and foot bottom, in this example, has a flat plate-type structure made of metal, for example.

Figure 13(A) is a diagram showing an outline of an element bottom (the illustrated example is a waist bottom 123, and the same applies below), and Figure 13(B) is a diagram showing an example of an element bottom to which a sensor device 5 is attached. The following description will be given with reference to the drawings. Each element bottom has multiple through holes 123a, 123b that penetrate each element bottom in the thickness direction from its upper surface to its lower surface. These multiple through holes 123a, 123b can function as air vents to improve ventilation of the bottom surface of a mattress placed on the bottom 2.

The first through holes 123a are formed in a plurality of positions along the first direction of the bottom element. When the sensor device 5 is attached to the bottom element, the protrusion 56 of the lever cover 52 can be accommodated inside the first through holes 123a.

The second through hole 123b is used to insert a fastener for attaching the sensor device 5 to the element bottom.

For example, the sensor device 5 is disposed below the element bottom, with the multiple protrusions 56 of the lever cover 52 exposed upward from the multiple first through holes 123a, the female screw holes of the four arms 53 exposed upward from the four second through holes 123b, and the through holes 54a of the two fixing plates 54 each positioned above the second through holes 123b, whereby the fixing plates 54 and the arms 53 are fixed to the element bottom by the fixing screws (not shown), and the sensor device 5 is firmly fixed to the element bottom in a hanging manner.

The above-mentioned configuration and the shape of the element bottom shown in the figure are just an example. For example, the first through hole 123a and the second through hole 123b formed in the element bottom may be processed in a metal plate-type element bottom to match the shape of the sensor device 5, or the sensor device 5 may be formed to match the shape of holes already provided in the element bottom. Note that while an example of the waist bottom 123 has been illustrated and described here, the same applies to other element bottoms.

Figure 14 shows a second modified example of the bottom elements. Each of the bottom elements, such as the back bottom, waist bottom, knee bottom, and foot bottom, in this example, has a flat plate-type structure made of resin, for example.

Figure 14 (A) is a diagram showing an outline of an element bottom (the illustrated example is a waist bottom 323, the same applies below), and Figure 14 (B) is a diagram showing an example of an element bottom to which a sensor device 5 is attached. Each element bottom has multiple through holes 323a, 323b. The multiple through holes 323a, 323b function as through holes that penetrate each element bottom in its thickness direction from its upper surface to its lower surface. For example, the multiple through holes 323a, 323b may be ventilation holes that are pre-formed in each element bottom to improve ventilation of a mattress placed on the bottom.

In this example, the configuration of each element bottom is the same as in the first modified example, but it differs in that it is made of resin. In this example, resin element bottoms make it easier to mold through holes, etc., compared to metal ones, and can also reduce contact noise with other components.

Figure 15 is a diagram showing a third modified example of the element bottom. Each of the element bottoms, such as the back bottom, waist bottom, knee bottom, and foot bottom, in this example has a flat metal plate-type structure, similar to the first modified example (Figure 13). The element bottom of this example (waist bottom 223 in the illustrated example, the same below) is similar to the first modified example in terms of the configuration for attaching each sensor device 5 (specifically, the configuration of the first through hole 223a and the second through hole 223b), but differs from the first modified example in that the position of the sensor device 5 can be changed.

Figure 15 (A) is a diagram showing an outline of an element bottom, and Figures 15 (B), (C), and (D) are diagrams showing examples of element bottoms to which a sensor device 5 is attached. The following description will be given with reference to the drawings.

The element bottom of this example has a greater number of first through holes 223a and second through holes 223b along the first direction than the second modified example. This allows the position of the sensor device 5 to be variable in the width direction of the bed 1, for example, as shown in Figures 15(B) and (D).

The bottom element also has multiple sets of first through holes 223a and second through holes 223b along the second direction, each set corresponding to one of the sensor devices 5. This allows the position of the sensor device 5 to be variable in the length direction of the bed 1, for example, as shown in Figures 15(C) and (D).

Figure 16 is a diagram showing a fourth modified example of the element bottom. Each of the element bottoms, such as the back bottom, waist bottom, knee bottom, and foot bottom, in this example has a flat resin plate-type structure, similar to the third modified example (Figure 15). The element bottom of this example (waist bottom 423 in the illustrated example, the same below) is similar to the second modified example in terms of the configuration for attaching each sensor device 5 (specifically, the configuration of the first through hole 423a and the second through hole 423b), but differs from the second modified example in that the position of the sensor device 5 can be changed.

Figure 16 (A) is a diagram showing an outline of an element bottom, and Figures 16 (B), (C), and (D) are diagrams showing examples of element bottoms to which a sensor device 5 is attached. The following description will be given with reference to the drawings.

The element bottom of this example has a greater number of first through holes 423a and second through holes 423b along the first direction than the second modified example. This allows the position of the sensor device 5 to be variable in the width direction of the bed 1, for example, as shown in Figures 16(B) and (D).

The bottom element also has multiple sets of first through holes 423a and second through holes 423b along the second direction, each set corresponding to each sensor device 5. This allows the position of the sensor device 5 to be variable in the length direction of the bed 1, for example, as shown in Figures 16(C) and (D).

The embodiments described above are merely examples for the purpose of explanation, and are not intended to limit the scope of the present invention to these embodiments. The present invention can be embodied in various forms other than the above-described embodiments.

1: Bed, 2: Bottom, 4: User detection system, 5: Sensor device, 6: Monitoring and control device, 7: Bottom drive system, 9: Nurse call system, 11: Base frame, 12: Center frame, 13: Head frame, 14: Foot frame, 15: Caster, 16: Lifting mechanism, 21: Back bottom, 21A: Upper back bottom, 21B: Lower back bottom, 21C: Back bending hinge, 23: Waist bottom, 24: Back lifting hinge, 25: Knee bottom, 26: Knee bending hinge, 27: Foot bottom, 28: Knee lifting hinge, 31: Outer frame, 33A: Vertical wire, 33B: Horizontal wire, 35: Through hole, 51: Support, 51a: Bottom wall, 51b: Side wall, 51c: Top part, 52: Lever cover, 52a : Top wall, 52b: Side wall, 52c: Bottom, 53: Arm, 54: Fixing plate, 54a: Through hole, 56: Convex portion, 57: Groove, 58: Support rod, 58a: Lower end, 71: Pressure sensor, 72: Cushioning material, 73: Coil spring, 90: Portable communication terminal, 91: Child unit, 92: Parent unit, 123: Waist bottom, 123a: First through hole, 123b: Second through hole , 153: arm, 153a: locking hole, 154: fixing plate, 155: locking protrusion, 155a: tip, 155b: inclined surface, 223: waist bottom, 223a: first through hole, 223b: second through hole, 323: waist bottom, 323a: first through hole, 323b: second through hole, 423: waist bottom, 423a: first through hole, 423b: second through hole

Claims (21)

A user detection system for detecting a state of a user on a bed, comprising:
The user detection system includes:
a plurality of sensor devices each configured to detect a load of the user and generate a signal corresponding to the load;
a monitoring control device that receives the signals from the plurality of sensor devices and detects a state of the user;
having
The user detection system is configured to be removably attached to the bed as a retrofit;
The plurality of sensor devices are detachably attached to a plurality of different positions of the bed bottom in a plan view in a manner of being suspended from the bed bottom,
User detection system.
the bottom has a plurality of through holes penetrating the bottom in a thickness direction thereof and capable of functioning as ventilation holes;
Each of the sensor devices has a pressed portion that is pressed by the load of the user,
When each of the sensor devices is attached to the bottom, the pressed portion is inserted into the through hole from below,
The pressure-receiving portion in the through hole is pressed by a mattress placed on the bottom, so that each of the sensor devices detects the load of the user.
The user detection system of claim 1 .
When the sensor devices are attached to the bottom, the upper surface of the pressed portion is positioned at the same height as or lower than the upper surface of the bottom so that the bottom surface of the mattress enters the through hole due to the weight of the user, and the upper surface of the pressed portion is pressed by the mattress.
The user detection system of claim 2 .
When the bottom has a number of the through holes that is greater than the number of the sensor devices,
By changing the through hole into which the pressed portion of each of the sensor devices is inserted, the mounting position of each of the sensor devices on the bottom can be changed.
The user detection system according to claim 2 or 3.
The bottom is a bottom having a mesh structure, and a plurality of meshes of the bottom having the mesh structure are used as the plurality of through holes.
The user detection system according to claim 2 or 3.
the bottom is a flat bottom made of metal or resin, the flat bottom having a plurality of ventilation holes;
The plurality of ventilation holes are used as the plurality of through holes.
The user detection system according to claim 2 or 3.
Further, a fastener is provided for removably attaching the sensor device to the bottom,
The fixing device is configured so that an operator can fix the sensor device to the bottom by using a screw or by one-touch fixing.
The user detection system of claim 1 .
The fixing device has a snap-fit connection structure that enables an operator to fix the sensor device to the bottom with one touch.
The user detection system of claim 7.
The upper surface of the fixture is located at the same height as or lower than the upper surface of the bottom.
A user detection system according to claim 7 or 8.
Eight of the sensor devices are provided,
When the user lies on the bed with his/her body stretched straight and his/her height aligned along the longitudinal direction of the bed, two of the eight sensor devices are attached to each of four areas of the bottom that receive loads from four parts of the user's back, the lower back including the part from the lower back to the buttocks, the upper part of the lower legs including the part from the thighs to the knees, and/or the lower part of the lower legs including the part from the lower legs to the feet,
The two sensor devices attached to each of the regions of the bottom are respectively arranged in a first half region from the center in the width direction of each of the regions of the bottom to one end in the width direction, and a second half region from the center in the width direction of each of the regions to the other end in the width direction.
The user detection system of claim 1 .
The bottom has four element bottoms: a back bottom supporting the back of the upper body of the user; a waist bottom supporting the waist including the portion from the lower waist to the buttocks of the user; a knee bottom supporting the upper portion of the lower leg including the portion from the thigh to the knee; and a foot bottom supporting the lower portion of the lower leg including the portion from the lower leg to the foot of the user; and the back bottom, the knee bottom, and the foot bottom are variable in angle with respect to the horizontal;
said user detection system comprising eight said sensor devices;
Two of the sensor devices selected from the eight sensor devices are attached to each of the four element bottoms;
The two sensor devices attached to each of the bottom elements are disposed in a first half region from the center of the width direction of each of the bottom elements to one end of the width direction, and a second half region from the center of the width direction of each of the bottom elements to the other end of the width direction, respectively.
The user detection system of claim 1 .
Each of the sensor devices has a support and a lever cover disposed on an upper side of the support,
the lever cover has a fulcrum supported by the support body and an extension portion extending in one direction from the fulcrum in a plan view,
The extension portion is vertically rotatable about the fulcrum and is elastically lifted from the support body,
the lever cover has the pressed portion on an upper portion of the extension portion,
each of the sensor devices is disposed such that the one direction in which the extension portion extends is along the width direction of the bottom and the pressed portion is located closer to the center of the bottom in the width direction than the fulcrum in a plan view;
The user detection system of claim 2 .
Each of the sensor devices is
a cushion disposed below the extension portion of the lever cover;
a pressure sensor disposed above the support and below the cushion;
having
When the pressure-receiving portion is pressed downward by the load of the user, the lever cover descends to apply pressure to the pressure-sensitive sensor via the cushion, and the pressure-sensitive sensor outputs a signal corresponding to the pressure.
The user detection system of claim 12.
The bottom has two or more of the through holes arranged at different positions in the width direction of the bottom,
Each of the sensor devices has two or more pressed portions arranged at different positions in an upper portion of the extension portion in the one direction in which the extension portion extends in a plan view,
When each of the sensor devices is attached to the bottom, two or more of the pressed portions are inserted into two or more of the through holes arranged in the width direction of the bottom, respectively.
A user detection system according to claim 12 or 13.
The lever cover of each of the sensor devices covers the entire upper area of the support from above.
A user detection system according to claim 12 or 13.
The monitoring and control device is disposed below the waist bottom.
The user detection system of claim 11.
The bed includes a bottom drive system for driving one or more of the bottom elements;
The monitoring control device is connected to the bottom drive system and detects the state of the user based on the signals from the plurality of sensor devices and a signal related to the drive of the bottom element from the bottom drive system.
The user detection system of claim 11.
Each of the plurality of sensor devices includes a pressure-receiving portion that is pressed by the load of the user, and a pressure-sensitive sensor that detects the load of the user via the pressure-receiving portion,
The pressed portion is inserted into a through hole penetrating the bottom in a thickness direction,
Each of the sensor devices is configured to detect the load of the user by pressing the pressure-receiving portion.
The user detection system of claim 1 .
The bed has a mattress placed on the bottom,
The mattress bulges into the through hole due to the load of the user, thereby pressing the pressed portion.
20. The user detection system of claim 18.
The sensor device included in the user detection system of claim 1 .
A bed comprising the user detection system of claim 1 .

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