JP4141233B2 - Electric bed - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric bed that can raise and lower the entire bed in an electric bed that can raise and lower the back portion and knee portion of the bed.
[0002]
[Prior art]
The bed for nursing care, for example, arranges a back bottom and a knee bottom on a frame, and provides the back bottom so that it can be rotated around the knee bottom side portion, and the knee bottom is centered around the back bottom side portion. It is provided so as to be able to rotate, and the back bottom and the knee bottom of the bed can be raised and lowered by driving the back bottom and the knee bottom by an actuator. Further, the entire nursing bed is driven by an actuator so that it can be moved up and down. Accordingly, when the patient is lying on the bed, the entire bed is lowered to reduce the impact when the patient falls and falls from the bed (for example, the upper surface of the mattress is 250 mm from the floor). 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 knee bottom and when raising and lowering the entire bed, the actuator operates by driving a switch button provided on the operation box, and is driven by this actuator. The back bottom, knee bottom and bed frame move.
[0004]
[Problems to be solved by the invention]
However, recently, various accessories such as a fence are attached to the frame of the electric bed, and the structure of the frame itself is large up and down. For this reason, the gap between the lower end of the frame and the floor is small, and if the actuator is driven to lower the frame in order to lower the entire bed, there is a risk that the patient or caregiver's foot may be pinched Has increased. However, the conventional electric bed has not taken measures against the problem when the entire bed is lowered as described above.
[0005]
The present invention has been made in view of such a problem, and is capable of preventing the caregiver or the patient's foot from being pinched between the frame and the floor when the bed is lowered. The purpose is to provide a bed.
[0006]
[Means for Solving the Problems]
The electric bed according to the present invention includes a bed frame that supports a bed portion, a base portion installed on the floor, and an upper position LH (for example, a floor height) disposed between the base portion and the frame. 600 mm) and a lower position LL (for example, a floor height of 250 mm), an elevating device that moves the frame up and down, a control device that controls the elevating drive of the frame by the elevating device, and the switch operation to And an operation box that outputs a signal for instructing the controller to raise and lower the frame when an instruction to raise and lower the frame is provided, and the control device receives a lowering signal of the frame from the operation box. Further, after the frame is temporarily stopped at an intermediate stop position LM (for example, 290 mm in floor height) between the upper position LH and the lower position LL of the frame, After the pressing state of the opening switch in the control box is released, and wherein the lowering further said frame when it is pressed down switch again frame to the lower position LL. The floor height is the height from the floor of the upper surface of the mattress when the mattress is laid on the bed.
[0007]
Another electric bed according to the present invention includes a bed frame that supports a bed portion, a base portion that is installed on the floor, and an upper position LH and a lower position LL that are disposed between the base portion and the frame. A lifting device that moves the frame up and down, a control device that controls the lifting and lowering drive of the frame by the lifting device, and when the raising and lowering of the frame is instructed by a switch operation, And an operation box for outputting a signal for instructing raising and lowering, and when the lowering signal is input from the operation box, the control device is configured such that the position of the frame at that time is the upper position LH and the intermediate stop. when predetermined specific position LS is higher than that between the position LM, after lowering the said frame, after temporarily stopping at the intermediate stop position LM, the After the pressing state of the opening switch in the work box is released, which is lowered further the frame when it is pressed down switch again frame to the lower position LL, down signal from the operation box is inputted When the position of the frame at that time is lower than the specific position LS, the frame is lowered to the lower position LL without stopping at the intermediate stop position LM.
[0008]
DETAILED DESCRIPTION OF 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 a 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 an operation of the link. The frame 1 is supported on the carriage 7 through two link devices 10 and 11 on the head side and the foot side. In the frame 1, a back bottom 2, a back curved portion (not shown), a waist bottom 3, a knee bottom 4, a knee curved 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 in the lower part of the frame 1 drive the knee bottom 4 and the back bottom 2, respectively.
[0009]
Wheels 8 are arranged at the four corners of the carriage 7 so that the carriage 7 can be moved in any direction. A pair of link support portions 20 and 21 that are spaced apart in the bed width direction are fixed to the head-side end and the foot-side end of the carriage 7, respectively. A head-side link device 10 is supported on the upper end of the head-side link support portion 20, and a foot-side link device 11 is supported on 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 F <b> 1) of the link support portion 20. In addition, a pair of frame support portions 27 (shown only in FIG. 1) are fixed so as to protrude downward at positions aligned with the link support portions 20 in the frame 1. A rotating shaft 31 extending in the bed width direction is spanned on 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 portion 27. Therefore, the link 22 can swing around the fixed fulcrum F2. Further, the lower end of the pair of links 23 is fixed to the rotating shaft 31, and the link 22 and the link 23 are fixed to the rotating shaft 31 at a predetermined constant angle and connected to the fixed fulcrum F2. Yes. As a result, the links 22 and 23 rotate around the fixed fulcrum F2 while maintaining the predetermined angle.
[0011]
An actuator 12 is installed on the lower surface of the frame 1, and the tip of the piston rod of the actuator 12 is rotatably connected to the upper end of the link 23 via a link 24 by a moving fulcrum M1.
[0012]
Moreover, in the link apparatus 11, the link 25 is connected with the upper end (fixed fulcrum F3) of the link support part 21 so that rotation is possible. A pair of frame support portions 28 that are separated in the bed width direction are fixed so as to protrude downward at positions aligned with the link support portions 21 on the foot side of the frame. The rotary shaft 32 is spanned and is rotatably supported. The upper end of the link 25 is fixed to the rotating shaft 32. Thereby, the link 25 is rotatably supported by the frame support part 28 (fixed fulcrum F4) via the rotating shaft 32.
[0013]
Links 29 and 30 are fixed to the rotary shaft 31 and the rotary 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 rotating shaft 31 rotates, the rotating shaft 32 rotates following the rotating shaft 31 via the links 29 and 30 and the connecting rod 26.
[0014]
Accordingly, 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 rotary shaft 31 (see FIG. 1) fixed to the link 23 is similarly set. Rotate clockwise. Thereby, the rotating shaft 32 connected to the rotating shaft 31 via the connecting rod 26 and the link 30 also rotates in the clockwise direction. Then, the link 22 fixed to the rotary shaft 31 and the link 25 fixed to the rotary shaft 32 rotate clockwise about 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, eventually the interval between the frame 1 and the carriage 7 is shortened, and the frame 1 is lowered. When the frame 1 is raised, the piston rod of the actuator 12 is advanced to increase the distance between the frame 1 and the carriage 7 due to the reverse rotation 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 movement fulcrum M1 is known, the angles of the links 23 and 22 are known. From the length of the links 22 and 23, the distance between the frame 1 and the carriage 7, that is, the floor of the frame 1 is calculated by geometric calculation. The height from 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 moves in and out, and a motor rotation amount are detected, or the rotation speed of the motor is controlled to a predetermined value. There is a technique that obtains a motor rotation amount by adding an operation time to a rotation speed, and thereby detects a position of a piston rod. As a sensor for detecting the amount of motor rotation, a slit disk is attached to a motion mechanism such as a motor rotation shaft, and the rotation angle or the number of rotations is measured by blocking or passing light from the light emitting diode. There is a potentiometer that measures the resistance that changes with the rotation of a motor. Furthermore, as a sensor for controlling the rotation speed of the motor, the motor is rotated at a constant speed by detecting the counter electromotive voltage accompanying the rotation of the motor and controlling the power, and the operation time rotated at this rotation speed is integrated. The motor rotation amount is obtained by connecting a tachometer (generator) to the motor, detecting the generated voltage and controlling the power to rotate the motor at a constant speed, and integrating the operating time rotated at this rotational speed. There is one that calculates the motor rotation amount.
[0017]
The detection result of a sensor (not shown) that detects 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 apparatus showing the operation of the present embodiment, and FIG. 5 is a diagram showing changes in the frame height. First, the bed height is 600 mm for the upper position LH of the bed and 250 mm for the lower position LL. It is assumed that the bed moves up and down between 250 mm and 600 mm. The intermediate stop position LM is 290 mm, and the specific position LS is 300 mm. In this case, it is determined whether the current frame height L (obtained from the position detection result of the piston rod of the actuator) is the floor height, which is LS (300 mm) or more (step S1), and L is LS or more. In some cases, it is determined whether or not the bed lowering switch of the operation box is on (step S2). When the lowering switch is on, the piston rod of the actuator 12 is retracted and the lowering operation of the frame 1 is started. (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 decreases to the intermediate stop position LM (floor height 290 mm) (step S4), the descent of the frame 1 is temporarily stopped (step S5). Then, a buzzer is sounded to alarm (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 less 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 resumed (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 push 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 resumed and the frame lowering is temporarily stopped, the lowering of the frame is not resumed unless the operator once releases the bed lowering switch.
[0021]
The bed descending 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 the descent is higher than the specific position LS (for example, 300 mm), the descent is temporarily stopped at the intermediate stop position LM (for example, 290 mm), and then the operator When the button is pressed again, the button moves down 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 high enough to prevent pinching or the like even if a caregiver or patient's foot is present between the frame 1 and the floor. If the frame 1 is further lowered, the foot is pinched. It is a height that would be In the present embodiment, as described above, when the bed is lowered, the bed is temporarily stopped at the intermediate stop position LM. Therefore, after confirming that there is no foot below the frame 1, the operator presses the lower 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's foot from being pinched or peripheral devices from being pinched.
[0022]
On the other hand, when the operator presses the bed lowering switch of the operation box and the height L of the frame 1 is already less than LS (the floor height is 300 mm) (step S1), the process proceeds to step S9. It is determined whether or not the lowering switch is on, 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 is lowered to the low position LL (250 mm in floor height), and the bed height is lowered to the lower position LL all at once (step S11). Therefore, even if the bed height L passes the intermediate stop position LM of the frame 1, the descending of the bed does not stop. If it is determined in step S9 that the bed lowering signal is not input, the bed lowering is stopped and the process returns to step S1. When the frame height L decreases to the low position LL, the descent of the bed is stopped (step S12).
[0023]
This descending pattern is shown in (2) or (3) in FIG. That is, as in the pattern (2), when the bed height position L at the time when the descending signal is input is lower than the specific position LS (300 mm), the bed is stopped at the intermediate stop position LM (290 mm). And descends to the lowest position LL. This is because it has already been lowered to a considerably low position when the lowering switch is pressed, and there is no possibility that the foot will be caught even if it does not stop at the intermediate stop position LM. If the bed stops immediately after the switch is pressed, the operator suspects a failure of the apparatus and makes the operation 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 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 all at once to the lowest position LL.
[0025]
As described above, according to the present embodiment, when the bed is lowered, it is possible to reliably prevent an accident in which a caregiver or patient's foot is sandwiched between the frame 1 and the floor of the bed or a peripheral device is sandwiched. . 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-described embodiment, and can be applied to various electric lift beds. Further, the frame elevating device is not limited to the link device and the actuator that drives the link device as in the above-described embodiment, but may be configured such that a driving device such as an actuator directly elevates and lowers the frame.
[0026]
【The invention's effect】
As described above in detail, according to the present invention, when the bed lowering operation signal is input, the frame lowering is temporarily stopped when the frame height reaches a predetermined height. In addition, it is possible to reliably prevent an accident that a caregiver or a patient pinches his / her 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 illustrating an operation of a link mechanism.
FIG. 4 is a flowchart showing a control mode of the control device.
FIG. 5 is a view showing a lowering mode of the bed.
[Explanation of symbols]
1: Frame 2: Back bottom 3: Waist bottom 4: Knee bottom 5: Knee bent part 6: Foot bottom 7: Cart 10, 11: Link devices 12-14: Actuators 22, 23, 25: 29, 30: Links

Claims (2)

A bed frame that supports the bed part, a base part installed on the floor, and the frame is arranged between the base part and the frame and moves up and down between the upper position LH and the lower position LL of the frame. A lifting device, a control device that controls the lifting and lowering drive of the frame by the lifting device, and an operation box that outputs a signal that instructs the control device to lift and lower the frame when the lifting and lowering of the frame is instructed by a switch operation The control device temporarily holds the frame at an intermediate stop position LM between the upper position LH and the lower position LL of the frame when a lowering signal of the frame is input from the operation box. after stopping, after the pressed state of the opening switch in the control box is released, further said frame when lowering switch frame is pressed again Electric bed, characterized in that lowering the arm to the lower position LL. A bed frame that supports the bed part, a base part installed on the floor, and the frame is arranged between the base part and the frame and moves up and down between the upper position LH and the lower position LL of the frame. A lifting device, a control device that controls the lifting and lowering drive of the frame by the lifting device, and an operation box that outputs a signal that instructs the control device to lift and lower the frame when the lifting and lowering of the frame is instructed by a switch operation The control device has a predetermined position between the upper position LH and the intermediate stop position LM when a lowering signal is input from the operation box. If specific position LS to or higher than, after lowering the said frame, after temporarily stopping at the intermediate stop position LM, lowering in the operation box switch After the pressing state is released, which is lowered further the frame when it is pressed down switch again frame to the lower position LL, of the frame when lowering the signal from the operation box is inputted When the position is lower than the specific position LS, the electric bed is lowered to the lower position LL without stopping the frame at the intermediate stop position LM.

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