JP4057006B2 - Floor rubbing prevention device - Google Patents

Description

The present invention relates to a floor rubbing prevention device that prevents the occurrence of floor rubbing.
In the present invention, “substantially orthogonal” includes “orthogonal” and “approximately 90 degrees” includes “90 degrees”.

  Floor rubbing refers to a condition in which the skin and subcutaneous tissue are pressed to cause blood circulation problems and the skin becomes dead if the human body's resistance is reduced and the posture is continued for a long time. In order to prevent the occurrence of floor rubbing, it is important to avoid stuffiness and friction of the skin and at the same time avoiding the same part being pressed for a long time. In particular, in the case of a bedridden elderly person, it is required to change the supine posture every 1 to 2 hours, which is a heavy burden on the nursing and caregivers.

  Conventionally, various inventions have been made to solve this problem (see, for example, Patent Documents 1 and 2). For example, an air mat is laid under the human body, the air chamber of the mat is divided into a plurality of parts, and a body pressure is continuously applied to a specific human body part by appropriately switching between a chamber filled with air and a chamber exhausted. Something that prevents this has been devised. However, the air mat is not air permeable, the humidity between the human body and the mat becomes high, and an undesired phenomenon occurs that the skin is steamed. In addition, a device that moves the block up and down by mechanical means to disperse the body pressure has been devised, but it is a large unit that is integrated with the bed, and there are problems with air permeability, followability to bed posture change, etc. There is.

  Ensuring air permeability is particularly important, and the bottom of a normal bed is made of a metal mesh with a coarse mesh, which ensures air permeability. However, it is difficult to ensure this air permeability with a conventional floor rubbing prevention device.

JP 2001-333842 A JP 2000-166991 A

  The object of the present invention is to automatically prevent the same part from being pressed for a long time in order to prevent the occurrence of floor rubbing, achieve this without partly stuffy or rubbing the skin, and It is an object of the present invention to provide a floor rubbing prevention device that can be used by being mounted on an existing bed and can cope with changes in the posture of the bed without problems, such as rising of the upper body of the human body, bending of the knee and waist.

The present invention relates to a unit module that extends in the lateral width direction of a human body that is supine, and includes a conversion mechanism that converts at least rotational power into linear motion in a direction substantially orthogonal to the lateral width and the longitudinal direction of the human body. Have
The conversion mechanism includes a cam that is rotatably provided, and a suppression unit that selectively suppresses the linear motion of the unit module based on the rotational power of the cam.
The suppression means includes a stopper piece that is displaceable, an urging means that urges the stopper piece to a displacement position that suppresses linear movement of the unit module, and the stopper piece against the urging force of the urging means. An actuator capable of displacement driving,
A unit module assembly is formed by arranging the plurality of unit modules along the longitudinal direction of a human body that is supine, and the rotational power can be exchanged between adjacent unit modules. This is a floor rubbing prevention device.

The present invention further includes a flexible coupling for transferring rotational power between adjacent unit modules,
It is configured to be able to cope with a relative angle change between adjacent unit modules.

  Further, the present invention is characterized in that cams of adjacent unit modules are alternately arranged with a phase shift of approximately 90 degrees.

In the present invention, a set time zone and a standby time zone are determined in advance,
In the set time zone, the stopper piece of each unit module is driven to displace, the cam is rotated, the position of each unit module is set, and after a certain waiting time that can be set by the program, again in the next set time zone It is characterized in that the operation of setting the position of each unit module is repeated by driving the stopper piece of each unit module to displace and rotating the cam.

  In addition, the present invention provides a plurality of unit module assemblies that are mechanically independent, each unit module assembly can independently respond to a change in the posture of the bed, and each unit of the plurality of unit module assemblies can be programmed. The module is driven synchronously.

  Further, according to the present invention, only the specific unit module is driven by selectively displacing the stopper piece, and the load applied to the specific unit module is detected by detecting the rotational torque of the cam at this time. A detection means is further provided, and the distribution state of the body pressure is detected based on the detection result of the detection means.

  Further, the present invention calculates a difference value between a load applied to each unit module detected before the human body is mounted and a load applied to each unit module detected after the human body is mounted. The correction value is obtained by comparing the total difference value of the unit modules and the human body weight, and the absolute value of the load applied to each unit module is obtained.

  According to the present invention, in a unit module extending in the lateral width direction of a human body, body pressure is prevented from being continuously applied to a specific part of the human body by an operation in a direction substantially orthogonal to the lateral width and the longitudinal direction of the human body. be able to. For this reason, this can be performed without changing the posture of the entire human body and without rubbing the skin of the human body. Can be prevented.

  Therefore, to prevent the occurrence of floor rubbing, it automatically avoids pressing the same part for a long time, achieves this without causing part of the skin to be muggy or rubbed, and on the existing bed It is possible to realize a floor rubbing prevention device that can be mounted and used and can cope with changes in the posture of the bed without problems, such as rising of the upper body of the human body, bending of the knee and waist. Further, each unit module includes a conversion mechanism that converts at least rotational power into linear motion in a direction substantially orthogonal to the lateral width and the long direction of the human body, and receives rotational power between adjacent unit modules. Therefore, the unit module assembly can be configured to be thin and compact.

  Further, each unit module is linearly moved in a direction substantially orthogonal to the lateral width and the long direction of the human body by the rotation of the cam, and the linear movement of the unit module is suppressed by the suppressing means. As a result, any unit module can be selectively moved up and down, so that the body pressure can be accurately distributed according to the physique of the person supine by changing the selection and timing of the unit module that moves up and down. it can.

The stopper piece is provided to be displaceable, and the urging means urges the stopper piece to a displacement position that suppresses the linear motion of the unit module. The actuator can drive the stopper piece against the urging force of the urging means. The linear movement of the unit module can be selectively suppressed by the suppression means having such a stopper piece, biasing means and actuator.
In addition, since the exchange of rotational power with adjacent unit modules is performed via flexible couplings, the relative angle of adjacent unit modules can be changed, which can change the posture of the bed in the longitudinal direction. Can respond. That is, it becomes possible to lightly bend the waist and knees of the human body in response to a change in the posture of the bed while lying on the floor rubbing prevention device of the present invention.

  In addition, by alternately changing the phase of cams of adjacent unit modules, the maximum drive torque of the cam shaft required to raise the unit modules can be reduced, and the height of adjacent unit modules can be reduced. It is possible to change the height of the unit module assembly in a wave shape by changing the upper, middle, and lower steps. This wave-like vertical movement can give a massage effect to the human body.

  In addition, a set time zone and a standby time zone can be determined in advance, and the stopper pieces of each unit module can be displaced and driven to rotate the cam in the set time zone, thereby setting the position of each unit module. The waiting time can be arbitrarily changed by a program. As a result, it is possible to avoid continuous compression of specific parts of the human body without causing the massage effect to the human body by operating in an early cycle with almost zero standby time, and without disturbing the sleeping comfort by lengthening the standby time. is there.

  Also, a plurality of unit module assemblies that are mechanically independent are provided so that each unit module assembly can independently cope with changes in the posture of the bed, and the vertical movement of each unit module of the plurality of unit module assemblies can be performed by programming. By synchronizing, the unit module can be moved up and down as if it were one unit module assembly, and the body pressure distribution of the human body can be performed reliably and without giving the human body a sense of incongruity.

  In addition, by detecting only the specific unit module up and down and detecting the rotational torque of the cam at this time, it is possible to easily detect the body pressure distribution state by detecting the load applied to the specific unit module. can do.

  In addition, the total difference in load applied to the unit modules before and after the human body is mounted is calculated and compared with the weight of the human body recognized in advance to accurately detect the load applied to each unit module. can do. Therefore, it is possible to identify a unit module having a particularly large load, that is, a portion where the body pressure of the human body is large, and to focus the body pressure distribution on this portion.

  The floor rubbing prevention device of the present invention is intended to be mounted on an existing bed, but it goes without saying that it can also be used on a flat floor such as a tatami mat. Also in this case, since there is a gap between the adjacent unit modules, appropriate air permeability can be ensured for the human body who is lying.

  The best mode for carrying out the invention will be described in the following examples.

  FIG. 1 is a perspective view showing an entire configuration of a floor rubbing prevention device 1 according to an embodiment of the present invention. FIG. 2 is an upper unit module assembly including one drive unit and a plurality of unit modules 5. FIG. FIG. 3 is a plan view schematically showing the lower unit module assembly 3 including one drive unit and a plurality of unit modules 5. In this embodiment, a floor rubbing prevention device 1 that prevents floor rubbing from occurring will be described. However, the description includes a method for measuring the weight distribution of a human body lying on a unit module, which will be described later. The floor rubbing prevention device 1 mainly includes an upper unit module assembly 2, a lower unit module assembly 3, a control device 15, and a hand console 16. The control unit 15, the upper unit module assembly 2, the lower unit module assembly 3, and the hand console 16 are electrically connected by cables 17, 18, and 19, respectively. Here, the upper and lower unit module assemblies 2 and 3 each have a power unit 4 and unit modules 5 that are driven by the power and operate up and down according to a program. The upper unit module assembly 2 includes ten unit modules 5 and one power unit 4. The lower unit module assembly 3 includes 15 unit modules 5 and one power unit 4. The upper and lower unit module assemblies 2 and 3 are mechanically independent, but are electrically controlled by the control device 15 in conjunction with each other. Here, the longitudinal direction of the human body lying on the floor rubbing prevention device 1 is defined as the X direction, and the lateral width direction of the human body lying on the floor is defined as the Y direction. The direction orthogonal to these X and Y directions is defined as the Z direction.

  FIG. 4 is a perspective view showing a state in which the upper unit module assembly 2 and the lower unit module assembly 3 are mounted on the existing bed 6. FIG. 5 shows the relative positional relationship among the upper unit module assembly 2, the lower unit module assembly 3, and the bed 6 when the posture of the bed 6 changes. FIG. 6 is an enlarged front view showing a state in which the unit modules 5 are connected. FIG. 7 shows the details of the bed posture changing mechanism, FIG. 7A is a front view of the first bed posture changing mechanism corresponding to the upper frame 7, and FIG. 7B corresponds to the lower frame 8. It is a front view of a 2nd bed attitude | position conversion mechanism.

  The upper unit module assembly 2 is attached to the upper frame 7 of the bed 6, and as is well known, the upper frame 7 is connected to the bed 6 via a first bed posture changing mechanism 11 by a bed hand console not shown. Thus, the rising angle α can be adjusted. The first bed posture changing mechanism 11 includes an electric cylinder 50, a link 51, and brackets 52 and 53. On the lower surface of the bed main body 6a of the bed 6, a bracket 53 is fixed to the vicinity of the middle in the longitudinal direction. An electric cylinder body 50a of the electric cylinder 50 is supported by the bracket 53 so as to be swingable. A bracket 52 is fixed to the lower surface portion of the upper frame 7, and the tip of the rod 50 b of the electric cylinder 50 is connected to the bracket 52. One end of the bed body 6 a in the longitudinal direction and the other end of the upper frame 7 in the longitudinal direction are connected by a link 51.

  A long hole 54a is formed at one longitudinal end of the lower frame 8, and a pin 54b attached to the other longitudinal end of the upper frame 7 is slidably engaged with the long hole 54a. ing. In other words, when the bracket 52 is driven by the electric cylinder 50 in the left direction (the direction away from the bracket 53) through the operation of the bed hand console, the upper frame 7 changes the position of the fulcrum, that is, the position of the pin 54b. It tilts while shifting to the left in the figure. Thus, the rising angle α of the upper frame 7 can be adjusted. In the present embodiment, the electric cylinder 50 is driven by the bed operator, and the rising angle α of the upper frame 7 is adjusted. However, the present invention is not necessarily limited to this form.

  The lower unit module assembly 3 is attached to the lower frame 8 of the bed 6. The lower frame 8 includes a vertically movable portion 8a, an intermediate movable portion 8b, a fixed portion 8c, and a hinge 9 and a hinge 10. The fixing portion 8c is fixed to the bed main body 6a, and the lower frame 8 can change its posture with the hinge 9 and the hinge 10 as the center as shown in FIGS. 5, 6, and 7B. This posture change can be performed via the second bed posture changing mechanism 12 by the bed hand console of the bed 6. The second bed posture changing mechanism 12 includes an electric cylinder 55, a link 56, and brackets 57 and 58. On the lower surface of the bed main body 6a, a bracket 58 is fixed to the middle portion in the longitudinal direction. An electric cylinder body 55a of the electric cylinder 55 is supported by the bracket 58 so as to be swingable. A bracket 57 is fixed to the lower frame 8 between the hinges 9, 10, that is, the lower surface portion of the intermediate movable portion 8 b, and the end portion of the rod 55 b of the electric cylinder 55 is connected to the bracket 57. The other end in the longitudinal direction of the bed main body 6 a and the other end in the longitudinal direction of the lower frame 8 (upper and lower movable portion 8 a) are connected by a link 56.

  When the bracket 57 is driven by the electric cylinder 55 in the illustrated right direction (direction away from the bracket 58) through the operation of the bed hand console, the intermediate movable portion 8b of the lower frame 8 is tilted around the hinge 9. The rising angle β can be adjusted. Along with the adjustment of the intermediate movable portion 8b, the vertically movable portion 8a of the lower frame 8 connected by the hinge 9, the hinge 10 and the link 56 is held and moved substantially parallel to the bed body 6a. The substantially parallel includes parallel. The rising angle β of the intermediate movable part 8b of the lower frame 8 can be adjusted independently of the upper frame 7 by the bed hand console. As shown in FIGS. 5 and 6, the lower unit module assembly 3 can follow the posture change of the lower frame 8.

  FIG. 8 is a front view for explaining a situation where each unit module 5 of the floor rubbing prevention device 1 is moving up and down. That is, a state where a person lies on the upper and lower unit modules 2 and 3 mounted on the bed 6 and the unit modules 5 of the upper and lower unit module assemblies 2 and 3 are moving up and down according to the program is shown. As shown in the figure, the unit module 5 lowered in one direction in the Z direction (indicated by the arrow Z1) does not take weight, so that the body pressure is applied to a specific part of the human body by sequentially changing the lowered unit modules 5. It can be prevented from continuing. Selection and switching interval of the descending unit module 5 can be freely changed by a program.

  FIG. 9 is a perspective view showing an overview of the unit module 5 constituting the floor rubbing prevention device 1. FIG. 10 is a vertical cross-sectional view of the main part of the unit module. The unit module 5 includes a lower rail 21 that comes into contact with the bed 6, an upper rail 22 that moves up and down relatively with respect to the lower rail 21, and a cam shaft 23 that transmits and receives rotational force between adjacent unit modules 5. It has. Although details will be described later, the upper rail 22 has a structure that is displaced in one direction and the other in the Z direction by the rotational force of the cam shaft 23, and the unit module 5 alone is independent in the Z direction (denoted by Z1) and the other. (Denoted by Z2) is provided with a moving mechanism. Adjacent unit modules 5 are connected by a coupling 31. By adopting a well-known universal joint type for this coupling 31, even when the axes of the cam shafts 23 of adjacent unit modules 5 are not parallel and have an angle, torque can be transmitted and received without any problem. be able to. As a matter of course, it is also possible to transmit power by using the cam shafts of adjacent unit modules in common without using a coupling.

  FIG. 11 is a cross-sectional view of the unit module of FIG. 9, and is a view for explaining a mounting state of a cam and a cam shaft that displace the unit module in one direction and the other in the Z direction. A cam 26 is fixed to the cam shaft 23 by a pin 46. A lower chassis 24 is fixed to the lower rail 21, and two bearings 45 are mounted on the lower chassis 24 with a predetermined small distance in the axial direction of the cam shaft 23. One bearing 45 is fitted and engaged with one side wall portion 24a of the lower chassis 24, and the other bearing 45 is fitted and engaged with the other side wall portion 24b. The cam shaft 23 is attached to the lower chassis 24 through these two bearings 45. An upper chassis 25 is attached to the upper portion of the cam 26, and the upper chassis 25 is fixed to the upper rail 22. When the cam shaft 23 rotates, the upper chassis 25 and the upper rail 22 operate in one direction and the other in the Z direction according to the shape of the cam 26. An inverted U-shaped notch 25 a is formed in a part of the upper chassis 25, and the inverted U-shaped notch 25 a is slidably fitted to the cam shaft 23. As described above, the unit module 5 is configured to be independently displaceable in one and the other in the Z direction by the rotational power supplied from the outside.

  FIG. 12 is a part of a vertical cross-sectional view of the unit module of FIG. 9 and shows a mechanism for displacing the unit module in one and the other in the Z direction and a stopper for selectively suppressing the displacement in the one and the other in the Z direction. It is a figure explaining a structure. FIG. 13 is a longitudinal sectional view showing a state in which the displacement of the unit module is allowed. This will be described with reference to FIG. 12 and 13 show the structure of one end of the unit module 5 in the longitudinal direction. The structure includes a mechanism for moving the unit module up and down (referred to as a vertical movement mechanism) and the stopper. The other end of the unit module 5 in the longitudinal direction is also provided with a structure similar to the above structure. Since the structure of the one end part in the longitudinal direction and the other end part are symmetrical, only the structure of the one end part in the longitudinal direction shown in the figure will be described, and the structure of the other end part in the longitudinal direction will be omitted.

  As described above, when the cam 26 rotates, the upper chassis 25 and the upper rail 22 operate in one direction and the other (for example, up and down) in the Z direction. The stopper piece 27 is attached to the upper chassis 25 through a pin 46 so as to be swingable. The base end portion of the stopper piece 27 is supported by the pin 46, and the tip end portion of the stopper piece 27 is provided so as to be swingable. The pin 46 is provided in parallel to the axial direction of the cam shaft 23. The stopper piece 27 is synonymous with the stopper 27. The spring 47 as the urging means is realized by, for example, a torsion spring, and functions to rotate the tip of the stopper 27 away from the cam 26, that is, in the counterclockwise direction in FIG. A base 28 is fixed to the lower chassis 24 on one side of the stopper 27 in the Z direction. A solenoid 29 as an actuator is mounted on the base 28, and the tip of the stopper 27 abuts on the tip of the plunger 30 of the solenoid 29 by the biasing force of the spring 47 described above. That is, the tip of the stopper 27 is always in contact with the plunger 30 of the solenoid 29 by the urging force of the spring 47.

  The solenoid 29 is configured to be able to drive the stopper 27 against the urging force of the spring 47. In the state of FIG. 12, the cam major axis is on the top and the upper chassis 23 is at the top dead center. At this time, a gap δ1 is formed between the stopper 27 and the base 28 to allow the stopper 27 to swing. When the solenoid 29 is energized and the plunger 30 protrudes in the direction approaching the cam 26, the left direction in FIG. 13 (the direction indicated by the arrow D 1), the tip of the stopper 25 resists the urging force of the spring 47. Then, it is kicked in the direction approaching the cam 26, that is, in the left direction in FIG. 13 (direction indicated by the arrow D1). When the cam 26 rotates at this time, the stopper 27 is lowered to one side in the Z direction without coming into contact with the base 28. That is, when the cam 26 rotates while the solenoid 29 is energized, the restriction by the stopper 27 is released, and the upper chassis 25 and the upper rail 22 that are in contact with and attached to the outer peripheral portion of the cam 26 are lowered in one direction in the Z direction. To do. Along with the upper chassis 25 and the upper rail 22, the stopper 27 also descends in the Z direction. On the other hand, when the cam 26 rotates while the solenoid 29 is not energized, the upper chassis 25 slightly lowers in one direction in the Z direction, but the tip of the stopper 27 abuts against the base 28 and the upper chassis 25 does not descend. Thus, depending on whether or not the solenoid 29 is energized, the operation of the upper chassis 25 and the upper rail 22 in the Z direction and the other can be selected. The stopper 27, the spring 47, and the solenoid 29 correspond to a suppressing unit. The suppression means and the cam 26 correspond to a conversion mechanism.

  Hereinafter, in order to explain the operation of the floor rubbing prevention bed of the present invention, the unit modules far from the unit module near the power unit 4 of the upper unit module assembly 2 are assigned serial numbers m1 to m10 in descending order. Then, serial numbers m25 to m11 are assigned in ascending order to the unit modules 5 far from the unit modules 5 close to the power unit 4 of the lower unit module assembly 3. The unit module 5 may be simply referred to as module 5.

  At this time, the odd-numbered module 5 and the even-numbered module 5 are mounted with cams 26 at the same phase angle, and the odd-numbered module 5 and the even-numbered module 5 are mounted with the cams 26 shifted in phase by 90 °. Has been. By mounting the cams 26 by changing the phase in this way, the cams 26 of all the unit modules 5 do not lift the upper rails 22 at the same time, so that the total rotational force of the cam shaft 23 can be reduced. it can. Further, for example, when the maximum radius portion of the cam 26 of the odd-numbered module 5 reaches directly below or above, that is, when the upper rail is set to the top dead center or the bottom dead center, the maximum radius of the odd-numbered module 5 is set. The section is substantially horizontal, and the upper rail stops at a position intermediate between the top dead center and the bottom dead center.

  Next, the pattern operation of the unit module assembly will be described. As described above, the upper unit module assembly 2 and the lower unit module assembly 3 are mechanically independent, but are electrically controlled by the control device 15 and the pattern operation is also interlocked. Controlled.

  FIG. 14 is a diagram for explaining an example of the operation state of the unit module assembly. This figure is a front view when the unit module m10 of the upper unit module assembly 2 and the unit module m11 of the lower unit module assembly 3 are placed close to each other in the X direction. The upper and lower operating states are shown. m <b> 1, m <b> 2 to m <b> 25 represent each module 5. Numbers m5 to m24 are not shown. In the case of this example, the four types of patterns (a), (b), (c), and (d) in the figure are repeated continuously. (A) shows a state in which the solenoid 29 of the stopper 27 of each module 5 of m4, m8, m12, m16, m20, and m24 is energized and the upper rail 22 is lowered and is in a low position. (B) shows a state in which the solenoid 29 of the stopper 27 of the module 5 of m3, m7, m11, m15, m19, and m23 is energized and the upper rail 22 is lowered and is in a low position. The timing for switching from the state (a) to the state (b) can be changed by a program. Similarly, the state changes to the states (c) and (d), returns to the state (a) again, and repeats the operation in the same pattern. By operating in such a pattern, there are fewer modules 5 in the lower level than modules 5 in the higher level, so that it is possible to change the part to which body pressure is applied without giving an extreme sense of incongruity to the human body supine. it can. Further, by performing the switching timing at intervals as long as several tens of minutes, the sense of incongruity given to the person is further reduced.

  FIG. 15 is a diagram for explaining another example of the operation state of the unit module assembly. In the case of this example, the four types of patterns (e), (f), (g), and (h) in the figure are repeated continuously. Here, as in the case described with reference to FIG. 14, the operation of the unit modules 5 of m5 or less is a repetition of the operation pattern of the four unit modules 5 of m1 to m4. The description of the operation of the other unit modules 5 will be omitted.

  In the state of FIG. 15E, the solenoid 29 of the m2 stopper 27 is not energized and is on the rail, and the solenoid 29 of the m1, m3, m4 stopper 27 is energized. At this time, the cam shaft 23 is stopped at the position where the cam major axis portion of the even-numbered unit module 5 is positioned downward, so that the upper rails 22 of the m1 and m3 unit modules 5 are stopped at the intermediate position in the Z direction. The upper rail of the unit module is in the lower position. In the state of (f), the solenoid 29 of the stopper m1 is not energized, the upper rail is in a high position, and the solenoid 29 of the stopper 27 of m2, m3, m4 is energized. At this time, the cam shaft 23 is stopped at a position where the cam major axis portion of the odd-numbered unit module 5 is positioned downward, whereby the upper rails 22 of the m2 and m4 unit modules 5 are stopped at the intermediate position in the Z direction. The upper rail 22 of the unit module 5 is in the lower position. When the state of (e) is compared with the state of (f), the unit module 5 at the higher level or the unit module 5 at the lower level has moved toward the younger unit module number by one module pitch. Thereafter, the states (g) and (h) in the figure can be generated by the same method.

  By repeating the four patterns (e), (f), (g), and (h) in succession, the unit modules 5 of the upper and lower unit module assemblies 2 and 3 change into a wave shape, and the body It is possible to generate a state that is moving from bottom to top. By setting the switching time to each pattern of (e), (f), (g), and (h) to a time as short as, for example, several seconds, it is possible to give a massage effect to the human body. It is also possible to more easily generate the operation state of FIG. Specifically, the cams 26 of the four unit modules 5 that are continuous in the x direction are arranged at 0 degree, 90 degrees, 180 degrees, and 270 degrees, respectively, and arranged in this pattern for each of the four unit modules 5. The operation state can be realized by rotating the cam shaft 23.

  FIG. 16 is a diagram illustrating the structure of the power unit of the unit module assembly. The cam shaft 23 of the unit module 5 is connected to the output shaft 32 of the power unit via a coupling 31 (see FIG. 11). A motor 42 as a drive source is fixed on the base plate 43, and the output shaft of the motor 42 is connected to the gear 40 via the torque sensor 41. Another gear 38 meshes with the gear 40 and rotates the drive shaft 37. The drive shaft 37 is supported by bearings 36 and 39. The rotation angle of the drive shaft 37 is detected by a rotary encoder (not shown). A bevel gear 35 is attached to both ends of the drive shaft 37, and another bevel gear 34 that meshes with the bevel gear 35 is fixed to the output shaft 32. Eventually, the rotational output of the motor 42 is transmitted to the output shaft 32, and the rotational angle is monitored by a rotary encoder. The output shaft 32 and the rotary encoder are disposed on the same rotation axis.

  Next, a method for measuring the weight distribution of the human body lying on the unit module 5 by the function of the power unit will be described. First, in the state where no person is placed, any one unit module 5 is selected from the unit module assembly, the stopper 27 is operated, and the cam shaft 23 is rotated once. The driving torque of the cam shaft 23 at this time is measured, and the value is set to Pm. Next, in the state where the person is lying, the same module 5 is selected, the stopper 27 is operated, and the cam shaft 23 is rotated once. The driving torque of the cam shaft 23 at this time is measured, and the value is defined as Pn. The same measurement is performed for all the unit modules 5, and a difference between the total value of the measured values Pm when no person is placed and the total value of the measured values Pn when the person is supine is obtained, and this is defined as δP. This value δP corresponds to the weight of a person who is supine. Thus, for each unit module 5, when the measurement value Pm is subtracted from the measurement value Pn and the value is divided by the value δP, that is, (Pn−Pm) / δP is obtained, this value is applied to each unit module 5. Corresponds to the distribution weight of the supine person. In this way, the weight distribution of a person who is supine can be measured by a simple method.

  According to the floor rubbing prevention device 1 described above, in the unit module 5 extending in the lateral width direction of the human body, the movement in the Z direction substantially orthogonal to the lateral width direction and the longitudinal direction of the human body is performed continuously to a specific part of the human body. It is possible to prevent body pressure from being applied. Therefore, this can be performed without changing the posture of the entire human body, without rubbing the skin of the human body, and air convection is performed from the gap δ2 (see FIG. 1) between the unit modules 5. Prevents human skin from stuffy due to humidity.

  Therefore, in order to prevent the occurrence of floor rubbing, it is automatically avoided that the same part is pressed for a long time, and this is achieved without causing a part of the skin to be muggy or rubbed, and on the existing bed 6 It is possible to implement the floor rubbing prevention device 1 that can cope with a change in the posture of the bed 6 without problems, such as rising of the upper body of the human body, bending of the knee and waist, and the like. Further, each unit module 5 includes a conversion mechanism that converts at least rotational power into linear motion in the Z direction substantially orthogonal to the lateral width and the long direction of the human body, and exchanges rotational power between adjacent unit modules 5. Therefore, the unit module assemblies 2 and 3 can be configured to be thin and compact. Therefore, the unit module assembly can be easily transported and the handling can be simplified.

  Since the rotational power is exchanged with the adjacent unit modules 5 via the flexible coupling, it is possible to change the relative angle of the adjacent unit modules 5 and to change the posture of the bed 6 in the longitudinal direction. It can correspond to. That is, it is possible to lightly bend the hips and knees of the human body in response to the posture change of the bed 6 while lying on the floor rubbing prevention device 1. Further, the rotation of the cam 26 causes the unit modules 2 and 3 to linearly move in the Z direction substantially orthogonal to the width and length of the human body, and the linear movement of the unit modules 2 and 3 is suppressed by the suppression means. As a result, any unit module 5 can be selectively driven in the Z direction, so that the body pressure can be accurately adjusted according to the physique of the person supine by changing the selection and timing of the unit module 5 to be driven in the Z direction. Dispersion can be performed.

  The stopper 27 is provided to be displaceable, and the spring 47 biases the stopper 27 to a displacement position that suppresses the linear motion of the unit module 5. The solenoid 29 as an actuator can drive the stopper 27 against the urging force of the spring 47. The linear movement of the unit module 5 can be selectively suppressed by such suppression means having the stopper 27, the spring 47, and the solenoid 29. Further, by alternately changing the phases of the cams 26 of the adjacent unit modules 5, it is possible to reduce the maximum driving torque of the cam shaft 23 required when the unit modules 5 are raised, and the adjacent unit modules. Thus, the height of the unit module assemblies 2 and 3 can be changed in a wave shape by changing the height in the Z direction in a stepwise manner from upper, middle, and lower. This wave-like vertical movement can give a massage effect to the human body.

  In addition, a set time zone and a standby time zone are determined in advance, and the cam 27 is rotated by displacing the stopper 27 of each unit module 5 in the set time zone, so that the position in the Z direction of each unit module 5 can be set. . The waiting time can be arbitrarily changed by a program. As a result, it is possible to avoid continuous compression of specific parts of the human body without causing the massage effect to the human body by operating in an early cycle with almost zero standby time, and without disturbing the sleeping comfort by lengthening the standby time. is there. Also, a plurality of unit module assemblies that are mechanically independent are provided so that each unit module assembly can independently cope with the posture change of the bed 6, and the Z of each unit module 5 of the plurality of unit module assemblies can be programmed. By synchronizing the movements in the directions, the unit module 5 can be moved up and down as if it were a single unit module assembly, and the body pressure distribution can be reliably performed without causing a sense of incongruity to the human body. be able to.

  In addition, only the specific unit module 5 is displaced in the Z direction, and the load applied to the specific unit module 5 can be detected by detecting the rotational torque of the cam 26 at this time. Thereby, the body pressure distribution state of the human body can be easily detected. In addition, by calculating the total difference value of loads applied to the unit modules 5 before and after the human body is mounted, and comparing them with the weight of the human body recognized in advance, the load applied to each unit module 5 can be accurately determined. Can be detected. Therefore, it is possible to identify the unit module 5 having a particularly large load, that is, a portion where the body pressure of the human body is large, and to focus the body pressure distribution on this portion. The floor rubbing prevention device 1 according to the present embodiment is intended to be mounted on an existing bed 6, but it goes without saying that it can also be used on a flat floor such as a tatami mat. Also in this case, since there is a gap between the adjacent unit modules, appropriate air permeability can be ensured for the human body who is lying.

It is a perspective view which shows the general view of the floor rubbing prevention apparatus 1 which concerns on one form of the actual condition of this invention. 3 is a plan view schematically showing an upper unit module assembly 2 including one drive unit and a plurality of unit modules 5. FIG. FIG. 4 is a plan view schematically showing a lower unit module assembly 3 including one drive unit and a plurality of unit modules 5. It is a perspective view which shows the state by which the upper unit module assembly 2 and the lower unit module assembly 3 were mounted on the existing bed 6. FIG. 2 is a front view illustrating a state in which the floor rubbing prevention device 1 is mounted on a bed 6 and the floor rubbing prevention device 1 corresponds to a change in posture of the bed 6. FIG. It is a front view which expands and shows the state in which the unit module 5 was connected. 7A shows details of the bed posture conversion mechanism, FIG. 7A is a front view of the first bed posture conversion mechanism corresponding to the upper frame 7, and FIG. 7B is a second bed corresponding to the lower frame 8. It is a front view of a posture conversion mechanism. It is a front view explaining the situation where each unit module 5 of floor rubbing prevention device 1 is operating up and down. It is a perspective view which shows the general view of the unit module 5 which comprises the floor rubbing prevention apparatus 1. FIG. It is a longitudinal cross-sectional view of the principal part of a unit module. FIG. 10 is a cross-sectional view of the unit module of FIG. 9, illustrating a mounting state of a cam and a cam shaft that displace the unit module in one direction and the other in the Z direction. FIG. 10 is a part of a vertical cross-sectional view of the unit module of FIG. 9 and describes a mechanism for displacing the unit module in one direction and the other in the Z direction, and a structure of a stopper for selectively suppressing the displacement in the one direction and the other in the Z direction. FIG. It is a longitudinal cross-sectional view which shows the state in which the vertical movement of the unit module was permitted. It is a figure explaining an example of the operation state of a unit module aggregate. It is a figure explaining the other example of the operation state of a unit module aggregate. It is a figure explaining the structure of the motive power part of a unit module assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor rubbing prevention apparatus 2 Upper unit module assembly 3 Lower unit module assembly 4 Unit module assembly power section 5 Unit module 6 Bed 21 Lower rail 22 Upper rail 23 Cam shaft 24 Lower chassis 25 Upper chassis 26 Cam 27 Stopper 28 Unit 29 Solenoid 31 Coupling 32 Output shaft 41 Torque sensor 42 Motor 44 Rotary encoder m1 to m25 Serial number added to each unit module constituting upper and lower unit module assembly

Claims (7)

A unit module that extends in a lateral direction of a human body that is supine, and includes a conversion mechanism that converts at least rotational power into a linear motion in a direction substantially perpendicular to the lateral width and the longitudinal direction of the human body,
The conversion mechanism includes a cam that is rotatably provided, and a suppression unit that selectively suppresses the linear motion of the unit module based on the rotational power of the cam.
The suppression means includes a stopper piece that is displaceable, an urging means that urges the stopper piece to a displacement position that suppresses linear movement of the unit module, and the stopper piece against the urging force of the urging means. An actuator capable of displacement driving,
A unit module assembly is formed by arranging the plurality of unit modules along the longitudinal direction of a human body that is supine, and the rotational power can be exchanged between adjacent unit modules. Floor rubbing prevention device. Further equipped with a flexible coupling for transferring rotational power between adjacent unit modules,
2. The floor rubbing prevention device according to claim 1, wherein the floor rubbing prevention device is configured to cope with a change in relative angle of adjacent unit modules. The floor rubbing prevention device according to claim 1 or 2 , wherein cams of adjacent unit modules are alternately arranged with a phase shift of approximately 90 degrees . Predetermining the set time zone and standby time zone,
In the set time zone, the stopper piece of each unit module is driven to displace, the cam is rotated, the position of each unit module is set, and after a certain waiting time that can be set by the program, again in the next set time zone rotating the cam by the movement driving the stopper piece of each unit module, bedsores prevention device according to claim 1, wherein the repeating the operation for setting the position of each unit module. A plurality of unit module assemblies that are mechanically independent are provided, each unit module assembly can independently cope with a change in the posture of the bed, and each unit module of the plurality of unit module assemblies is driven synchronously by programming. The floor rubbing prevention device according to claim 4 . Detection means for detecting the load applied to the specific unit module by detecting only the specific unit module by selectively displacing and driving the stopper piece and detecting the rotational torque of the cam at this time is further provided. , based on the detection result of the detecting means, bedsores prevention apparatus according to claim 1, wherein the detecting the distribution of the body pressure. The difference value of each unit module is calculated by calculating the difference between the load applied to each unit module detected before the human body is mounted and the load applied to each unit module detected after the human body is mounted. sum compensation value is obtained by comparing the body weight, the absolute value bedsores prevention apparatus according to claim 6, wherein Rukoto seeking the load on each unit module.

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