JP2005118089A - Bed equipment - Google Patents

Abstract

Provided is a bed apparatus that minimizes damage even if it falls if there is a risk of falling or fear of separation from a mattress.
Recognizing the position of a user on the mattress by a plurality of pressure sensors regularly distributed on the mattress, and when the user stands on the mattress or tries to get off the bed, the mattress When sitting at the edge, the frame on which the mattress is placed is lowered to the lowest position.
[Selection] Figure 1

Description

  The present invention relates to a bed apparatus.

Various devices have been devised from the standpoint of safety management in bed devices, particularly care beds used when a user needs care. Patent Document 1 shows an example of this, and provides a bed apparatus that accurately detects the standing of a patient and ensures the safety of the patient. That is, in this bed apparatus, the time measurement is started when any one of the plurality of first sensors for detecting a change in pressure applied to the bed surface and the second sensor detects a change in pressure equal to or greater than the first predetermined value. When the timer and the time measured by the timer are within a predetermined range, the grouped sensor of the second sensors outputs a warning to the alarm device when a change in pressure exceeding the second predetermined value is detected. And a control unit that allows the caregiver to be notified of the user's dangerous standing on the mattress.
JP 2001-276150 A

  In the bed device described above, the user's dangerous standing on the mattress is detected by pressure change and is reported to the caregiver, but if the caregiver is not near the bed device, the user shall There is a possibility of falling.

  Therefore, this invention makes it the subject to provide the bed apparatus which does not have such a concern.

  In order to solve the above problem, the technical means taken in claim 1 is as follows: “A plurality of pressure sensors regularly distributed on the mattress are used to recognize the posture of the user on the mattress, and the user can The bed apparatus is configured such that when standing on the mattress or sitting on the edge of the mattress, the frame on which the mattress is placed is lowered to the lowest position.

  According to the first aspect of the present invention, when the danger of falling or the possibility of separation from the mattress is expected, the frame is moved to the lowest position, and even if it falls, the damage is minimized.

  The present invention will be specifically described with reference to embodiments. In the following example, only the bed lifting mechanism will be described as the electric mechanism, but the electric mechanism in the present invention is not limited to this. It goes without saying that all mechanisms such as the back raising mechanism and the knee raising mechanism are also useful as the electric mechanism in the present invention as long as they are electric mechanisms.

  As shown in the figure, the electric bed 1 in this example includes four legs 2 installed on the floor E. The leg portions 2 are used in units of two on the head side a and the foot side b of the electric bed 1, and are thick plate-like plates placed on the floor E at positions spaced apart in the width direction W. The base 3 and the top fixing frame 4 (see FIG. 3) are firmly connected and fixed.

  In addition, a leg frame 2 holds a lifting frame 5 on which a bedding not shown is placed and which can be lifted and lowered. This elevating frame 5 is a frame-like body having a predetermined strength, and is provided with horizontal position frames 5a, 5a horizontally arranged in the width direction W at a predetermined interval on the head side a and the foot side b of the bed 1. The vertical position frames 5b and 5b connected to the horizontal position frames 5a and 5a and horizontally disposed along the vertical direction P, and the vertical direction Y connected to the horizontal position frames 5a and 5a on the head side a and the foot side b, respectively. Board frames 5c and 5c (see FIG. 3) and top frames 5d and 5d (see FIG. 3) connecting the tops of the board frames 5c and 5c.

  In addition, the vertical frames 5b and 5b have auxiliary frames 5e and 5e that extend in equilibrium with the horizontal frames 5a and 5a at substantially the center position, and a drive that is horizontally fixed and held by the auxiliary frames 5e and 5e. The part mounting base 5f is connected.

  As shown in FIG. 1, an elevating motor 6 as an electric motor for driving the elevating frame 5 is attached to the drive unit mounting base 5 f of the elevating frame 5. The output shaft of the elevating motor 6 is connected to the speed reducer 7. Further, the output shaft of the speed reducer 7 is connected to the horizontal shaft 8. Both ends of the horizontal shaft 8 are inserted into the horizontal position frames 5 a and 5 a of the lifting frame 5. In the lateral position frame 5a, the end of the horizontal shaft 8 is connected to the screw shaft 9 via drive direction conversion means such as a bevel gear. The screw shaft 9 is screwed into a nut member (not shown), and this nut member is fixed to the elevating frame 5. Therefore, the rotational driving force from the elevating motor 6 is first transmitted to the speed reducer 7 and is converted into a predetermined rotational speed and rotational torque by the speed reducer 7. Thereafter, the rotational driving force is transmitted from the speed reducer 7 to the horizontal shaft 8, and the horizontal shaft 8 rotates. The rotational force of the horizontal shaft 8 is changed in direction by a bevel gear and transmitted to the screw shaft 9, and the screw shaft 9 rotates. Then, the nut means (not shown) moves in the vertical direction (Y1 and Y2 directions in FIGS. 2 and 3) by the rotation of the screw shaft 9, and the lifting frame 5 moves up and down accordingly.

  FIG. 4 is an electric circuit diagram showing a power supply system for supplying power to the lifting motor 6 in the electric bed 1. As shown in the figure, the power supply system 50 in this example includes two transformers (an electric motor side transformer 62 and a control device side transformer 72) connected to an AC power source A such as a household power source. An electric motor side primary circuit 61 is formed on the primary side of the electric motor side transformer 62, and an electric motor side secondary circuit 63 is formed on the secondary side. Similarly, a control device side primary circuit 71 is formed on the primary side of the control device side transformer 72, and a control device side secondary circuit 73 is formed on the secondary side. The motor-side secondary circuit 63 is connected to the lifting motor 6, and the control device-side secondary circuit 73 is connected to a CPU 90 as a control device that controls the operation of the lifting motor 6.

  Further, relays 64 and 64 are interposed in the motor side primary circuit 61. The relays 64 and 64 function as switching means that opens and closes a contact when an external contact open / close signal is input and switches between conduction and non-conduction of current in the motor-side primary circuit 61. In this example, a normally open type relay is used as the relay 64.

  Further, the power supply system 50 in the example includes a remote controller 92. The remote control 92 has drive buttons arranged on its surface for instructing driving of various electric mechanisms. When the drive button is pressed, a drive command signal for instructing driving of the selected electric mechanism is received. It is transmitted to the CPU 90. Therefore, the remote controller 92 in this example corresponds to drive instruction means. The CPU 90 outputs drive signals for controlling various electric motors based on the drive command signal input from the remote controller 92.

  In addition, the power supply system 50 includes a signal generator 91. This signal generator 91 is a case where the person H is not likely to fall down as in the case where the person H is lying on the approximate center of the mattress 99 placed on the lifting frame 5 (FIG. 6). Does not emit a signal, but as shown schematically in FIG. 7, when a person H sits down at the edge of the mattress 99 trying to get off the bed, or rises on the mattress 99, a signal is emitted. Yes. However, the signal generator 91 includes a plurality of pressure sensors 912 arranged in a matrix in the cloth bag 910. These pressure sensors 912 are connected to a CPU (not shown) installed in the bag 910, and this CPU has a pressure sensor at the end in the longitudinal direction of the bag 910 in the state shown in FIG. When no pressure is detected, no signal is issued, but when a danger of falling or fear of separation from the mattress 99 is expected in the state shown in FIG. 7, a signal is issued. When this signal is transmitted to the CPU 90, the CPU 90 drives the elevating motor 6 to shift the elevating frame 5 to the lowest position so that even if it falls, the damage is minimized.

  In addition, as shown in FIG. 8, the inside of the bag 910 may be partitioned and a sheet-like pressure sensor may be enclosed in the partition.

  FIG. 5 is a diagram showing a current path in the electric power supply system of the electric bed in this example. In FIG. 5, the connection indicated by the solid line indicates the power supply path, and the arrow indicated by the dotted line indicates the delivery of the electric signal. Hereinafter, with reference to FIG.4 and FIG.5, the power supply method of the power supply system in this example is demonstrated.

  First, the outlet plug of the electric bed 1 is inserted into a plug receptacle of a household power outlet and the power is turned on. Then, the AC voltage is applied to the motor side primary circuit 61 and the control device side primary circuit 71.

  In the control device side primary circuit 71, a current flows when a voltage is applied, and power is supplied to the control device side transformer 72. Transformation is performed by the control device side transformer 72, for example, converted into 5V alternating current and flows to the control device side secondary circuit 73. The 5V alternating current is converted into a 5V direct current by an AC converter (not shown) interposed in the control device side secondary circuit 73. The 5V DC current is supplied to the CPU 90, and the CPU 90 operates.

  On the other hand, normally open relays 64 and 64 are interposed in the motor-side primary circuit 61, and since the relays 64 and 64 are not energized (non-energized state), the contacts are opened. Yes. Therefore, no power is supplied to the motor-side primary circuit 61 and no power is supplied to the motor-side transformer 62. A state in which power is not supplied to the motor-side transformer 62 and power is supplied only to the control device-side transformer 72 is a standby state.

  The motor-side transformer 62 needs a large capacity, for example, a capacity of about 90 KVA, for supplying a driving current for driving the lifting motor 6. On the other hand, since the control device side transformer 72 only operates the CPU 90, a small capacity, for example, a capacity of about 1 KVA is sufficient. Therefore, in the standby state, power is not supplied to the motor-side transformer 62 having a large capacity, and power is supplied only to the controller-side transformer 72 having a small capacity. As a result, electric power can be saved by the amount not supplied to the electric motor-side transformer 62.

  From such a standby state, when the user or the like operates the remote controller 92 and presses a button for operating the lifting mechanism of the electric bed 1, for example, the drive command signal S1 of the lifting mechanism is wirelessly transmitted from the remote control 92 to the CPU 90. The The CPU 90 receives this signal and outputs a contact closing signal S2 to the relays 64 and 64. The relay 64 is energized in response to the contact closing signal S2, and closes the contact. Therefore, the motor-side primary circuit 61 is turned on, and the electric power from the power source A is supplied to the motor-side transformer 62, where it is transformed and converted into, for example, 24V AC and flows to the motor-side secondary circuit 63. The 24V AC is converted into a 24V DC current by an AC converter (not shown) interposed in the motor side secondary circuit 63. This 24 V DC current is supplied to the lifting motor 6.

  The CPU 90 outputs an opening command signal S <b> 2 to the relay 64 and outputs a drive signal S <b> 3 to the elevating motor 6. For this reason, the elevating motor 6 is driven in response to the drive signal S3. Accordingly, the lifting mechanism is driven to raise and lower the bed.

  When the lifting mechanism has finished a predetermined operation, the lifting motor 6 outputs an operation end signal S4 to the CPU 90. When the CPU 90 receives this operation end signal S4 or the input signal (drive command signal) S1 from the remote controller 92 is cut off, the CPU 90 outputs the contact opening signal S5 to the relay 64 immediately or after a predetermined time has passed ( Alternatively, the output of the contact closing signal S2 is stopped or the stop signal of the contact closing signal is output.) For this reason, the relay 64 is in a non-energized state, the contact is opened, and the motor-side primary circuit 61 is made non-conductive. For this reason, the electric power from the power source A is supplied only to the control device side transformer 72 and the supply of electric power to the motor side transformer 62 is stopped. That is, it again enters a standby state. In this example, when the lifting motor 6 is in an operating state, the supply of power to the transformer on the side to which the lifting motor 6 is connected is stopped. For this reason, power saving can be achieved.

  As described above, the power supply system 50 for supplying power to the lifting motor 6 that drives the electric mechanism (elevating mechanism or the like) incorporated in the electric bed 1 in this example is connected to the power source A. A motor-side transformer 62 and a control device-side transformer 72, and the motor is connected to a motor-side secondary circuit 63 that is a secondary side of the motor-side transformer 62. As a configuration in which the CPU 90 is connected to a certain control device side secondary circuit 73, a transformer that supplies power to the lifting motor 6 and a transformer that supplies power to the CPU 90 are separated. For this reason, electric power can be saved by stopping the electric power supply to the electric motor side transformer 62 when the raising / lowering motor 6 is inactive. Therefore, it is possible to provide a power supply system that minimizes power consumption and saves power.

  Further, since the motor side primary circuit 61 is provided with a relay 64 as switching means for switching between conduction and non-conduction of current in the motor side primary circuit 61, it is not necessary to operate the lifting motor 6. In some cases, the relay 64 can turn off the current in the motor-side primary circuit 61 and stop the supply of power to the motor-side transformer 62. By switching at the relay 64, when the lifting motor 6 is in an inoperative state, the supply of power from the power source A to the motor-side transformer 62 can be reliably stopped, and power can be saved. Therefore, it is possible to realize a power supply system that reduces power consumption as much as possible and saves power with a simple configuration.

  Further, since the relay 64 is employed as the switching means, sequence control of the switching means can be realized, and a configuration suitable for power-saving automatic control can be achieved.

  The power supply system 50 shown in this example includes a remote controller 92 as a drive instruction unit that outputs a drive command signal S1 for instructing driving of the electric mechanism to the CPU 90. The CPU 90 receives the drive command signal S1 when the drive command signal S1 is input. A contact opening / closing signal (contact closing signal S 2) is output to the relay 64 to make the motor-side primary circuit 61 conductive, and a drive signal S 3 is output to the lifting motor 6. In other words, in other words, unless the drive command signal S <b> 1 is output from the remote controller 92, the motor-side primary circuit 61 is turned off and the supply of power to the motor-side transformer 62 is stopped. By setting it as such a structure, it becomes possible to suppress reliably consumption of the electric power until the raising / lowering motor 6 drives (before the raising / lowering motor 6 drives).

  Further, the CPU 90 immediately receives the operation end signal S4 output when the elevating motor 6 ends the operation based on the drive signal S3, or when the input signal (drive command signal) S1 from the remote control 92 is cut off. Alternatively, a contact open / close signal (contact stop signal S5 or contact close signal S2 output stop or contact close signal stop signal) is output to the relay 64 after a predetermined time has elapsed, and the motor-side primary circuit 61 is made non-conductive. After the operation of 6 is finished or when the input signal (drive command signal) S1 from the remote controller 92 is turned off, the motor-side primary circuit 61 becomes non-conductive and the supply of power to the motor-side transformer 62 is stopped. . For this reason, it is possible to reliably suppress the power consumption after the driving of the lifting motor 6 is completed.

  In addition, if the position of a person is detected based on the detection status of multiple pressure sensors distributed on the mattress, and there is a risk of falling, drive the lift motor to the lowest position. It is possible to shift and minimize damage in the worst case.

The top view of the frame structure of the bed apparatus concerning the present invention. The side view of the bed apparatus shown in FIG. The perspective view of the bed apparatus shown in FIG. The electric circuit for the drive of the bed apparatus shown in FIG. The figure which shows the current pathway of the circuit shown in FIG. The plane schematic diagram which shows a user's supine state in the bed apparatus shown in FIG. The plane schematic diagram which shows a user's body posture (excluding the supine state) in the bed apparatus shown in FIG. The another plane schematic diagram which shows a user's body posture (exclusion: supine state) in the bed apparatus shown in FIG.

Explanation of symbols

5 Frame 912 Pressure sensor 99 Mattress

Claims (1)

The posture of the user on the mattress is recognized by a plurality of pressure sensors regularly distributed on the mattress, and when the user stands on the mattress or sits at the edge of the mattress, the mattress is A bed device in which the frame to be placed is lowered to the lowest position.

Images