JP2004159807A - Electric bed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric bed which can inhibit pinching the leg of a caregiver or a patient between a frame and a floor when dropping the bed. <P>SOLUTION: The control device of a drive-gear, which makes the frame 1 go up and down by driving link motions 10 and 11, once stops the frame 1 at a medium stop level LM (bed height of 120mm) when the height position of the frame 1 is equal to or higher than a specified level LS (bed height of 130mm) when a decline signal is inputted and makes the frame go down to the lowest level LL (bed height of 85mm) when the decline signal is inputted again. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric bed capable of raising and lowering a back portion, a knee portion, and the like of a bed, in which the entire bed can be raised and lowered.
[0002]
[Prior art]
In the nursing bed, for example, a back bottom and a knee bottom are arranged on the frame, the back bottom is provided rotatably about a portion on the knee bottom side, and the knee bottom is centered on a portion on the back bottom side. The bed is rotatably provided, and the back bottom and the knee bottom are driven by the actuator, so that the back part and the knee part of the bed can be raised and lowered. In addition, the nursing care bed as a whole can be driven up and down by an actuator. Thus, when the patient is lying on the bed, the entire bed is lowered to a lower position (e.g., the upper surface of the mattress is 250 mm above the floor) in order to reduce the impact when the patient falls over from the bed after turning over. ), When the patient is examined or cared for, the entire bed is raised to an upper position (for example, the upper surface of the mattress is 600 mm from the floor) so that the caregiver can easily examine or care for the patient. Can be set.
[0003]
In such an electric bed, when raising and lowering the back bottom and the knee bottom and when raising and lowering the entire bed, by pressing a switch button provided in the operation box, the actuator operates and the actuator is driven. Then, the back bottom, the knee bottom and the bed frame move.
[0004]
[Problems to be solved by the invention]
However, recently, the electric bed is configured such that various accessories such as a fence are attached to the frame, and the structure itself of the frame is vertically large. For this reason, the gap between the lower end of the frame and the floor is small, and if the frame is lowered by driving the actuator in order to lower the entire bed, there is a danger that the foot of the patient or caregiver will be pinched. Has increased. However, the conventional electric bed has not taken measures against the problem when the entire bed is lowered in this way.
[0005]
The present invention has been made in view of such a problem, and an electric motor that can prevent a caregiver or a patient's foot from being caught between a frame and a floor when a bed is lowered. The purpose is to provide a bed.
[0006]
[Means for Solving the Problems]
An electric bed according to the present invention includes a bed frame, a platform installed on the floor, a lifting device arranged between the platform and the frame for raising and lowering the frame, and a control device for controlling the lifting device. And an operation box for outputting a signal for instructing the control device to raise or lower the frame. When the lowering signal of the frame is input, the control device controls the predetermined intermediate stop position LM (for example, the floor height). 290 mm), the frame is once stopped, and when a lowering signal is input again, the frame is further lowered to a predetermined lower position LL (for example, 250 mm in floor height). The floor height is the height of the mattress from the floor when the mattress is laid on the bed.
[0007]
In this electric bed, the control device moves the frame up and down between an upper position LH of the frame (for example, a floor height of 600 mm) and a lower position LL of the frame, and outputs a lowering signal from the operation box. When the height position of the frame when is input is higher than a specific position LS (for example, 300 mm in floor height) between the LH and the LM, the frame is lowered. Thereafter, the frame is temporarily stopped at the intermediate stop position LM, and the frame is stopped at the intermediate stop position LM when the height position of the frame when the descent signal is input is lower than the specific position LS. Without moving down to the lower position LL.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a perspective view showing the structure of an electric bed according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a view showing the operation of the link. The frame 1 is supported on the carriage 7 via two link devices 10 and 11 on the head side and the foot side. In the frame 1, a back bottom 2, a back bending portion (not shown), a waist bottom 3, a knee bottom 4, a knee bending portion 5, and a foot bottom 6 are arranged in this order. The back bottom 2 is installed on the frame 1 so as to be rotatable about the knee bottom 4 side, and the knee bottom 4 is installed on the frame 1 so as to be rotatable about the back bottom 2 side. The waist bottom 3 is fixed, and the foot bottom 6 moves up and down in conjunction with the rise and fall of the knee bottom 4. The back bending portion and the knee bending portion 5 are curved to smoothly connect the bottoms on both sides thereof, and both have the same structure. Actuators 13 and 14 installed at the lower part of the frame 1 drive the knee bottom 4 and the back bottom 2 respectively.
[0009]
Wheels 8 are arranged at four corners of the cart 7 so that the cart 7 can be moved in any direction. Further, a pair of link support portions 20 and 21 that are separated from each other in the bed width direction are fixed to the head-side end and the foot-side end of the cart 7, respectively. The head-side link device 10 is supported at the upper end of the head-side link support portion 20, and the foot-side link device 11 is supported at the upper end of the foot-side link support portion 21.
[0010]
In the link device 10, the link 22 is rotatably connected to the upper end (fixed fulcrum F1) of the link support 20. Further, a pair of frame support portions 27 (only shown in FIG. 1) are fixed at positions matching the link support portions 20 in the frame 1 so as to protrude downward. A rotating shaft 31 extending in the bed width direction is bridged at the lower end (fixed fulcrum F2) and is rotatably supported. The upper end of the link 22 is fixed to the rotating shaft 31 supported by the frame support 27, so that the link 22 can swing about the fixed fulcrum F2. The lower ends of a pair of links 23 are fixed to the rotating shaft 31, and the links 22 and 23 are fixed to the rotating shaft 31 at a predetermined fixed angle, and are connected to a fixed fulcrum F2. I have. Accordingly, the links 22, 23 rotate around the fixed fulcrum F2 while maintaining the predetermined angle.
[0011]
An actuator 12 is provided on a lower surface of the frame 1, and a tip of a piston rod of the actuator 12 is rotatably connected to an upper end of a link 23 by a moving fulcrum M1 via a link 24.
[0012]
In the link device 11, a link 25 is rotatably connected to the upper end (fixed fulcrum F3) of the link support 21. A pair of frame support portions 28 separated in the bed width direction are fixed at positions matching the link support portions 21 on the foot side of the frame so as to protrude downward. Is supported so as to be rotatable with a rotating shaft 32 spanned therearound. The upper end of the link 25 is fixed to the rotating shaft 32. Thus, the link 25 is rotatably supported by the frame support portion 28 (fixed fulcrum F4) via the rotation shaft 32.
[0013]
Links 29 and 30 are fixed to the rotating shaft 31 and the rotating shaft 32, respectively. A connecting rod 26 is rotatably connected to the links 29 and 30 between the links 29 and 30. Therefore, when the rotation shaft 31 rotates, the rotation shaft 32 rotates following the rotation shaft 31 via the links 29 and 30 and the connecting rod 26.
[0014]
Therefore, when the piston rod of the actuator 12 retreats into the cylinder, the link 23 is rotated clockwise in FIG. 2 via the link 24, and the rotating shaft 31 (see FIG. 1) fixed to the link 23 is similarly rotated. Rotate clockwise. Thereby, the rotating shaft 32 connected to the rotating shaft 31 via the connecting rod 26 and the link 30 also rotates clockwise. Then, the link 22 fixed to the rotation shaft 31 and the link 25 fixed to the rotation shaft 32 rotate clockwise around the fixed fulcrum F2 and the fixed fulcrum F4, respectively. As a result, the fixed fulcrum F1 and the fixed fulcrum F3 move in a direction approaching the frame 1, so that the interval between the frame 1 and the carriage 7 is shortened, and the frame 1 descends. When the frame 1 is raised, the distance between the frame 1 and the bogie 7 is increased by rotating the piston rod of the actuator 12 in a direction opposite to that described above, and the frame 1 is raised.
[0015]
The height of the frame 1 can be geometrically calculated from the advance length of the piston rod of the actuator 12 by the link mechanism shown in FIG. That is, when the position of the moving fulcrum M1 is known, the angles of the links 23 and 22 are known, and the distance between the frame 1 and the carriage 7, that is, the floor of the frame 1, is calculated from the length of the links 22 and 23 by geometric calculation. Can be calculated.
[0016]
As a method of detecting the position of the piston rod, for example, a potentiometer that measures resistance that changes as the piston rod advances and retreats, and a motor rotation amount is detected, or the motor rotation speed is controlled to a predetermined value, There is a method in which an operation time is added to a rotation speed to obtain a motor rotation amount, thereby detecting a position of a piston rod. As a sensor that detects the motor rotation amount, a slit disk is attached to a movement mechanism such as a motor rotation shaft, and the light from the light emitting diode is blocked or passed by the slit disk, and the rotation angle or rotation number is measured. There are a potentiometer that uses a Hall element to magnetically detect the number of revolutions, and a potentiometer that measures the resistance that changes with the rotation of the motor. Further, as a sensor for controlling the rotation speed of the motor, the motor is rotated at a constant speed by detecting a back electromotive voltage accompanying the rotation of the motor and controlling the power, and the operation time of the rotation at this rotation speed is integrated. To calculate the amount of motor rotation, connect a tachogenerator (generator) to the motor, detect the generated voltage, control the power so that the motor rotates at a constant speed, accumulate the operating time of rotation at this rotation speed There is one that calculates the motor rotation amount.
[0017]
A detection result of a sensor (not shown) for detecting the position of the piston rod of the actuator 12 is input to a control device (not shown), and the control device drives the actuator 12 based on the position of the piston rod. Control. An operation box (not shown) is provided with a switch for instructing raising and lowering of the bed, and a signal for instructing raising and lowering of the bed is input to the control device.
[0018]
Next, the operation of the electric bed configured as described above will be described. FIG. 4 is a flowchart of the control device showing the operation of the present embodiment, and FIG. 5 is a diagram showing a change in frame height. First, it is assumed that the upper position LH of the bed is 600 mm and the lower position LL is 250 mm at the floor height, and the height of the bed is raised and lowered between 250 mm and 600 mm. Then, the intermediate stop position LM is set to 290 mm, and the specific position LS is set to 300 mm. In this case, it is determined whether or not the current frame height L (determined from the position detection result of the piston rod of the actuator) is equal to or more than LS (300 mm) in the floor height (step S1). In some cases, it is determined whether the bed lowering switch of the operation box is on (step S2). If the lowering switch is on, the piston rod of the actuator 12 is retracted to start the lowering operation of the frame 1. (Step S3). This is continued until the frame height L decreases to LM (step S4). However, if the lowering switch is turned off halfway, the lowering of the frame is stopped (step S2), and the process returns to step S1.
[0019]
When the frame height L has decreased to the intermediate stop position LM (floor height 290 mm) (step S4), the lowering of the frame 1 is temporarily stopped (step S5). Then, a buzzer sounds and an alarm is issued (step S6).
[0020]
Thereafter, it is determined whether or not the bed lowering switch is on (step S7). If the bed lowering switch remains on, the bed lowering stop state is continued (step S8). When the bed lowering switch of the operation box is turned off (step S7), the process returns to step S1, and since the frame height L at that time is naturally smaller than LS, the process proceeds to step S9. Then, when the bed lowering switch is turned on again, the bed lowering operation (frame lowering operation) is restarted (step S10). Then, the frame is lowered until the frame height L reaches the lower position LL (step S11). As described above, after the frame lowering is temporarily stopped in step S5, the operator releases the pressing state of the bed lowering switch of the operation box (No in step S7), and then presses the bed lowering switch again (step S7). After the bed lowering operation is restarted and the frame lowering is temporarily stopped (S9: Yes), the lowering of the frame is not restarted unless the operator once releases the bed lowering switch.
[0021]
The bed lowering pattern at this time is shown in (1) of FIG. That is, when the bed height L (for example, 600 mm) at the start of lowering is higher than the specific position LS (for example, 300 mm), the lowering is temporarily stopped at the intermediate stop position LM (for example, 290 mm), and thereafter, the operator When the user presses the lowering button again, the user lowers to the lowest position LL (for example, 250 mm). The bed height in the above example is the distance between the floor surface and the lower surface of the edge of the frame 1. The specific position LS is a position slightly higher than the intermediate stop position LM. The intermediate stop position LM is at such a height that even if the caregiver's or the patient's foot is present between the frame 1 and the floor, no pinch or the like occurs. The height is such that it will be. In the present embodiment, as described above, when the bed is lowered, the bed temporarily stops at the intermediate stop position LM. Therefore, after confirming that there is no foot below the frame 1, the operator presses the lowering button again. When is pressed, the bed is lowered to the lowest position LL, so that it is possible to reliably prevent the caregiver or the patient from pinching the foot or the peripheral device.
[0022]
On the other hand, when the operator presses the bed lowering switch of the operation box, if the height L of the frame 1 is already less than LS (300 mm in floor height) (step S1), the process proceeds to step S9 and the bed is moved to step S9. It is determined whether the lowering switch is on or not, and when the bed lowering switch is on, the lowering operation of the frame 1 is started (step S10). The lowering of the frame 1 continues until the frame height L decreases to the low position LL (250 mm in floor height), and the bed height immediately lowers to the lower position LL (step S11). Therefore, even if the bed height L passes through the intermediate stop position LM of the frame 1, the bed does not stop descending. If it is determined in step S9 that the bed lowering signal has not been input, the process returns to step S1 with the bed lowering stopped. When the frame height L has decreased to the low position LL, the lowering of the bed is stopped (step S12).
[0023]
This falling pattern is shown in (2) or (3) in FIG. That is, if the bed height position L at the time of inputting the descending signal is lower than the specific position LS (300 mm) as in the pattern (2), the bed stops at the intermediate stop position LM (290 mm). And descends to the lowest position LL. This is because when the lowering switch is pressed, it has already descended to a considerably low position, and even if it does not stop at the intermediate stop position LM, there is no danger that the foot will be pinched, and If the bed stops immediately after pressing the switch, the operator suspects that the device is out of order and the operation becomes complicated. Therefore, in this case, the vehicle is not stopped at the intermediate stop position LM.
[0024]
If the bed height L is already lower than the intermediate stop position LM at the time when the lowering switch is pressed ((3) in FIG. 5), since L is less than LS in step S1, the bed is Naturally, it descends to the lowest position LL at a stretch.
[0025]
As described above, according to the present embodiment, it is possible to reliably prevent a caregiver or patient's foot from being pinched between the bed frame 1 and the floor, or an accident from pinching peripheral devices when the bed is lowered. . It should be noted that the present invention is not limited to the nursing bed in which the back bottom and the knee bottom rotate as in the above embodiment, but may be applied to various electric lifting beds. Further, the frame lifting / lowering device is not limited to the link device and the actuator that drives the link device as in the above-described embodiment, and may be a structure in which a driving device such as an actuator directly lifts and lowers the frame.
[0026]
【The invention's effect】
As described in detail above, according to the present invention, when the bed lowering operation signal is input, the frame lowering is temporarily stopped when the frame height reaches the predetermined height. In addition, it is possible to reliably prevent an accident in which a caregiver or a patient pinches a foot between the frame and the floor.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a structure of an electric bed according to an embodiment of the present invention.
FIG. 2 is a front view of the same.
FIG. 3 is a diagram showing the operation of a link mechanism.
FIG. 4 is a flowchart illustrating a control mode of a control device.
FIG. 5 is a view showing a lowering mode of a bed.
[Explanation of symbols]
1: frame 2: back bottom 3: waist bottom 4: knee bottom 5: knee bending part 6: foot bottom 7: carts 10, 11: link devices 12 to 14: actuators 22, 23, 25: 29, 30: links

Claims (2)

A bed frame, a pedestal installed on the floor, an elevating device arranged between the pedestal and the frame for elevating and lowering the frame, a control device for controlling the elevating device, The control device has an operation box that outputs a signal for instructing ascending and descending. When the descending signal of the frame is input, the control device temporarily stops the frame at a predetermined intermediate stop position LM, and then again descends the signal. The electric bed further lowers the frame to a predetermined lower position LL when is input. The control device moves the frame up and down between an upper position LH of the frame and a lower position LL of the frame, and the height position of the frame when a lowering signal is input from the operation box is: When the specific position LS between the LH and the LM is higher than the specific position LS, after lowering the frame, the frame is temporarily stopped at the intermediate stop position LM, and the frame is stopped when the lowering signal is input. The electric bed according to claim 1, wherein when the height position is lower than the specific position LS, the frame is lowered to the lower position LL without stopping at the intermediate stop position LM.

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