JP2004129709A - Back raising type bed apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a back raising type bed apparatus preventing a part of the body of a user from being strongly caught by a raisingly/loweringly movable part of a floor plate. <P>SOLUTION: This back raising type bed apparatus is provided with a bed frame, the floor plate 5 provided on the bed frame and having one part formed on the raisingly/loweringly movable back raising floor part 8, a back raising motor 14 raisingly/loweringly driving the movable part, a remote controller 27 having an automatic recovery type back raising switch 28 raising the back raising floor part and an automatic recovery type back lowering switch 29 lowering it, and remotely operating the back raising motor by the switches and a thyristor 41 changing over the driving direction of the back raising floor part from the raising direction to the lowering direction if a loading current flowing to the above driving motor becomes a prescribed value or more when the back raising switch is pushed and the movable part is driven in the raising direction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back-up type bed device capable of raising a user's upper body.
[0002]
[Prior art]
In the case of elderly and sick people who cannot raise their upper body by themselves, the back of the floorboard provided on the bed frame, which corresponds to the upper body of the user, can be driven up and down by a motor for raising the back. A rising bed device formed on a raised floor (movable part) is used.
[0003]
In such a bed-type bed apparatus, a remote controller is used for remotely raising and lowering the movable portion of the floorboard that can be driven up and down. The remote controller is provided with a back-up switch for raising the movable section, a back-down switch for lowering the movable section, and the like. For safety reasons, these buttons are turned on only while the user is pressing them, and are of an automatic reset type. Thus, when the user removes his / her finger from the button, the operation of the movable section in the ascending or descending direction is stopped.
[0004]
By the way, when the user is a sick or elderly person, the user is prevented from falling off the mattress of the bed device, preventing the comforter from slipping off, and grasping when the user gets off the bed device and stands up. For example, a side fence may be provided at the end of the bed frame in the width direction.
[0005]
[Problems to be solved by the invention]
When the bed frame is provided with side fences, the user may put his arm in the side fences while sleeping. If the user changes his or her body direction in such a state, the back-up switch of the remote controller inadvertently placed on the mattress is pressed, and the movable part rises against the will of the user. Sometimes. Then, the arm put in the side fence is sandwiched between the side fence and the movable part, and the pressure is strongly pressed, which may cause an undesirable state.
[0006]
In such a situation, it would be good if the user could accurately grasp the situation and respond to it. May not be able to deal with.
[0007]
According to the present invention, when the movable portion of the floorboard is driven in the ascending direction against the user's will, for example, when the arm is strongly sandwiched between the side fence and the movable portion, the movable portion automatically moves in the descending direction. An object of the present invention is to provide a bed device that is driven.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 includes a bed frame,
A floor plate provided on the bed frame and formed on a movable part that can be raised and lowered,
A driving motor for driving the movable portion up and down,
A remote controller that has an automatic return type back raising switch for raising the movable portion and an automatic return type lowering switch for lowering, and remotely controls the driving motor by these switches;
When the back-up switch is pressed and the movable part is driven in the ascending direction, when the load current flowing through the driving motor becomes a predetermined value or more, the driving direction of the movable part is switched from the ascending direction to the descending direction. Means,
A back-up type bed device characterized by comprising:
[0009]
According to a second aspect of the present invention, the switching means includes an overcurrent detection circuit for detecting an overcurrent flowing in the drive motor, and a switching direction of the drive motor which is activated by a detection signal from the overcurrent detection circuit. 2. The back-raising bed apparatus according to claim 1, further comprising a switching element for switching.
[0010]
According to a third aspect of the present invention, there is provided the back-up type bed apparatus according to the first aspect, further comprising a timer circuit for controlling a driving time of the movable portion in a downward direction by the switching means.
[0011]
According to the present invention, even when the back-up switch is pressed, if the current flowing through the drive motor becomes a predetermined value or more, the drive direction of the movable unit is switched from the ascending direction to the descending direction. The movable unit is prevented from continuing to be driven in the ascending direction with the user's arm sandwiched between the movable unit and the side fence.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIGS. 1 to 3 show a first embodiment of the present invention. The back-up type bed apparatus of the present invention shown in FIG. The base frame 1 is movably supported at a predetermined height by a leg member 3 provided with a caster 2 with a stopper at the lower end.
[0014]
A bed frame 4 is provided on the base frame 1 so as to be vertically movable by a vertical drive mechanism (not shown). A floor plate 5 is placed on the bed frame 4. This floor panel 5 is divided into a plurality of floor sections as shown in FIG. That is, the floor plate 5 has the fixed floor portion 6 fixed to the bed frame 1. To one end of the fixed floor portion 6, a waist floor portion 7 and a back raising floor portion 8 as a movable floor portion are sequentially rotatably connected. On the other side of the fixed floor section 6, a first leg-raising floor section 9 and a second leg-raising floor section 10 are sequentially rotatably connected.
[0015]
A drive mechanism 12 is provided on a lower surface side of the floor plate 5 of the bed frame 4. The drive mechanism 12 has a box 13. A back lifting motor 14 is provided on one side of the box 13 and a leg lifting motor 15 is provided on the other side. At one end of the box 13, there is provided a first drive shaft 16 which is rotationally driven by the back-lifting motor 14, and at the other end a second drive shaft 17 which is rotationally driven by the leg-lifting motor 15. Is provided.
[0016]
A base end of a back-raising arm 18 is connected and fixed to the first drive shaft 16, and a distal end of the back-raising arm 18 has a U-shaped cross section (not shown) provided on the lower surface of the back-raising floor 8. Are provided with a pair of rollers 19 rotatably engaged with the guide rails. The base end of a leg raising arm 21 is connected and fixed to the second drive shaft 17. A roller 22 that contacts the lower surface of the first leg-raising floor 9 is provided at the tip of the leg-raising arm 21.
[0017]
Therefore, if the first drive shaft 16 is rotationally driven by the back lifting motor 14 and the back lifting arm 18 is driven in the ascending direction, a pair of rollers 19 provided at the distal end of the back lifting arm 18 is used. The back raising floor portion 8 is driven in a rising direction.
[0018]
When the second drive shaft 17 is rotationally driven by the leg raising motor 15 and the leg raising arm 21 is driven in the ascending direction, the first leg is rotated by a roller 22 provided at the tip of the leg raising arm 21. The raised floor section 9 is driven in the rising direction. Since the second leg-raising floor 10 is interlocked with the elevation of the first leg-raising arm 9, the first leg-raising floor 9 and the second leg-raising floor 10 are bent substantially in a V-shape. Will do.
[0019]
A mattress 25 is placed on the upper surface of the floor plate 5 as shown in FIG. The user U lies on the upper surface of the mattress 25. In the case where the user U is a sick person or an elderly person with a physical disability, the user U is prevented from falling off from the mattress 25 when, for example, raising the raised floor portion 8 as shown in FIG. A side fence 26 is detachably provided on one side or both sides (one side in this embodiment) of the bed frame 4 to prevent the comforter from falling off.
[0020]
The drive mechanism 12 can be remotely operated by a remote controller 27. As shown in FIG. 2, the remote controller 27 includes a back raising switch 28, a back lowering switch 29, a leg raising switch 30, a leg lowering switch 31, and a raising switch 32 for operating the vertical drive mechanism to raise the bed frame 1. , A lowering switch 33 for lowering and a stop switch 34 are provided. Each of these switches 28 to 34 is an automatic return type push button type which is turned on only when the operator presses it and turned off when the pressed state is released. Note that a DC voltage is supplied to the remote controller 24 by a power supply 35 as shown in FIG.
[0021]
FIG. 3 shows an operation circuit 37 for driving the back lifting motor 14 by the remote controller 27. The operation circuit 37 has a PNP transistor 38 which is activated by turning on the back switch 28. A rising relay coil 39 is connected to the collector of the transistor 38.
[0022]
An anode of a thyristor 41 as a switching element is connected between the back switch 28 and the transistor 38. The base of the transistor 38 and the lowering relay coil 42 are connected to the cathode of the thyristor 41. Contacts (both not shown) between the ascending relay coil 39 and the descending relay coil 42 are provided in a switching circuit 43. The switching circuit 43 is supplied with a DC voltage. This DC voltage is converted from a commercial AC voltage by the power supply 44. The DC voltage converted by the power supply 44 is supplied to the remote controller 27 as a power supply 35.
[0023]
When the back-up switch 28 is turned on, the emitter and the collector of the transistor 38 conduct, and the energizing relay coil 39 is energized. When the rising relay coil 39 is energized and its contact is turned on, the switching circuit 43 outputs a drive signal to the back lifting motor 14 to lift the back lifting floor 8. Thereby, the back lifting motor 14 is rotated, for example, clockwise, and the back lifting arm 18 is driven in the upward direction.
[0024]
When the lowering switch 29 is turned on, the lowering relay coil 42 is energized and the contact provided in the switching circuit 43 is turned on. As a result, a drive signal for lowering the back raising floor portion 8 is output from the switching circuit section 43 to the back raising motor 14, and the driving signal causes the back raising motor 14 to rotate, for example, counterclockwise, and The raising arm 18 is driven in the downward direction.
[0025]
The back-lifting motor 14 is provided with an overcurrent detection circuit 45. The overcurrent detection circuit 45 detects the thyristor when the current flowing through the back-raising motor 14 exceeds a set value when the back-raising floor 8 is driven in the upward direction with the back-raising switch 28 being on. The detection signal D is output to the gate 41.
[0026]
When the detection signal is output to the gate of the thyristor 41, the conduction between the anode and the cathode of the thyristor 41 is performed. It is shut off, and electricity is supplied to the back lowering relay coil 42. As a result, the back raising floor 8 is forcibly driven in the downward direction from the upward direction.
[0027]
Since the detection signal D is output from the overcurrent detection circuit 45, the set value set in the overcurrent detection circuit 45 is such that the back-up motor 14 moves the back-up floor 8 in order to raise the upper body of the user U. The value is set to a value larger by a predetermined amount than a current value required for ascending drive.
[0028]
Therefore, for example, as shown in FIG. 1, the user U's upper limb is lifted with the upper limb in the side fence 26, and the upper limb is sandwiched between the mattress 25 and the side fence 26, and When the power required to raise the unit 8 increases, the detection signal D is output from the overcurrent detection circuit 45 to the gate of the thyristor 41. As a result, as described above, the lowering relay coil 42 is energized, and the back raising floor 8 is driven in the lowering direction.
[0029]
That is, in this embodiment, the overcurrent detection circuit 45 and the thyristor 41 constitute switching means for switching the driving of the back-raising floor 8 from the rising direction to the falling direction. The operation circuit 37 is provided in the box 13 of the drive mechanism 12.
[0030]
According to the back-up type bed device having such a configuration, when the user U is a sick person or an elderly person with a physical disability, the user U goes to bed with the remote controller 27 placed on the mattress 25 while sleeping. When the user U moves his body or turns over, the back-up switch 28 provided on the remote controller 27 may be pressed by a part of the body. In FIG. 1, the remote controller 27 is located below the user U's buttocks.
[0031]
Then, the back-raising motor 14 is operated to drive the back-raising floor 8 in the ascending direction, so that the upper body of the user U is raised. At this time, the user U may have a part of the body, for example, an upper limb put in the side fence 26, and when the back raising floor portion 8 rises in this state, the upper limb is pinched by the side fence 26, the mattress and 25. I will be.
[0032]
At that time, it is sufficient to notice that the user U is pressing the remote controller 27 with a part of the body, but it may not be noticed, and in such a case, the back-raising floor 8 continues to rise. become.
[0033]
If the user U keeps raising the back-raising floor 8 while the upper limb is sandwiched between the side fence 26 and the mattress 25, the load applied to the back-raising floor 8 increases. Also increase. Then, when the value of the current flowing through the back raising motor 14 becomes larger than the set value set in the overcurrent detection circuit 45, the detection signal D is output from the overcurrent detection circuit 45 to the gate of the thyristor 41.
[0034]
As a result, even when the back raising switch 28 of the remote controller 27 is in the ON state, the energization to the ascending relay coil 39 is interrupted, and the energizing to the descending relay coil 42 causes the back raising floor 8 to be forced. As the upper limb of the user U is sandwiched between the side fences 26, the back raising floor portion 8 does not continue to be driven in the ascending direction.
[0035]
FIG. 4 shows a second embodiment of the present invention. The second embodiment is a modification of the switching means for forcibly switching the driving direction of the back raising floor 8 from the ascending direction to the descending direction. In this embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0036]
That is, in the switching means of this embodiment, the detection signal output from the overcurrent detection circuit 45 is input to the timer circuit 51. As a result, a drive signal is output from the timer circuit 51 to the switching relay coil 52 as a switching element for a predetermined time.
[0037]
The switching relay coil 52 has a first relay contact 53 and a second relay contact 54. The first relay contact 53 has a normally closed contact 53a provided between the back raising switch 28 and the ascending relay coil 39, and a normally open contact 53b is open.
[0038]
The second relay contact 54 has a normally closed contact 54 a provided between the back lowering switch 29 and the lowering relay coil 42, and a normally open contact 54 b connected to the power supply 35 of the remote controller 27.
[0039]
In such a configuration, in a state where the user U puts the upper limb into the side fence 26 while sleeping, the back raising switch 29 of the remote controller 27 is turned on unexpectedly, and the back raising floor portion 8 moves in the rising direction. When the user U is driven, the back raising floor 8 may be driven in the ascending direction with the upper limb of the user U sandwiched between the side fences 26.
[0040]
Then, the load applied to the back-raising floor 8 increases, so that the overcurrent flowing through the back-raising motor 15 also increases, and this is detected by the overcurrent detection circuit 45. As a result, the detection signal D is output from the overcurrent detection circuit 45 to the timer circuit 51, so that the timer circuit 51 outputs a drive signal to the switching relay coil 52, and the first and second relay contacts 53, The switch 54 switches from the normally closed contacts 53a, 54a to the normally open contacts 54b, 54b.
[0041]
When the first relay contact 53 is switched from the normally closed contact 53a to the normally open contact 53b, the power supply to the ascending relay coil 39 is cut off, and the second relay contact 54 is changed from the normally closed contact 54a to the normally open contact 54b. When the mode is switched, the descending relay coil 42 is energized. Thereby, the rotation direction of the back raising motor 15 is switched from the direction in which the back raising floor 8 is raised to the direction in which it is lowered, so that the back raising floor 8 is forcibly lowered.
[0042]
Therefore, even if the user U turns on the back raising switch 28 of the remote controller 27 while sleeping, the back raising floor portion 8 continues to be driven in the ascending direction with the upper limb sandwiched between the side fences 26. Will be prevented.
[0043]
The driving time during which the back raising floor 8 is forcibly driven in the downward direction can be set to a predetermined time by the timer circuit 51. The descent time of the raised floor 8 by the timer circuit 51 is set, for example, to several seconds before the pressure state of the upper limb of the user U by the side fence 26 is released and before the raised floor 8 falls down horizontally. For example, it is possible to stop the lowering of the back-raising floor portion 8 in a state where the user U does not pinch a finger or the like between the bed frame 4 and the back-raising floor portion 8.
[0044]
The present invention is not limited to the above embodiments. For example, the up-and-down driving of the back-raising floor portion is performed by the back-raising arm. However, the screw shaft is rotated by the motor, and the nut screwed to the screw shaft is used. The lift-up floor may be driven up and down via a lift. In short, if the load increases due to an obstacle when the back-up floor is raised, a motor that generates an overcurrent may be used as a drive source. If this is the case, the present invention can be applied.
[0045]
The movable portion may be the first and second leg-raising floors, in which case the driving motor is a leg-raising motor.
[0046]
【The invention's effect】
As described above, according to the present invention, even when the back-up switch is pressed, if the current flowing through the driving motor becomes a predetermined value or more, the driving direction of the movable unit is changed from the rising direction to the falling direction. Is done.
[0047]
Therefore, when the movable part is driven in the ascending direction, for example, when the user's arm is sandwiched between the movable part and the side fence, the current flowing through the driving motor increases, and the driving direction of the movable part is lowered. Therefore, it is possible to prevent the user's arm from being strongly pressed too much.
[Brief description of the drawings]
FIG. 1 is a perspective view of a bed apparatus according to a first embodiment of the present invention.
FIG. 2 is a side view showing a driving mechanism for driving a raised floor portion of the floorboard.
FIG. 3 is a circuit diagram for driving a back lifting motor.
FIG. 4 is a circuit diagram for driving a back lifting motor according to a second embodiment of the present invention;
[Explanation of symbols]
4 Bed frame 5 Floor plate 8 Raised floor (movable part)
… Back raising motor (drive motor)
27 remote controller 28 back-up switch 29 back-down switch 41 thyristor (switching circuit)
45 ... Overcurrent detection circuit (switching means)
52 ... Switching relay (switching means)

Claims (3)

A bed frame,
A floor plate provided on the bed frame and formed on a movable part that can be raised and lowered,
A driving motor for driving the movable portion up and down,
A remote controller that has an automatic return type back raising switch for raising the movable portion and an automatic return type lowering switch for lowering, and remotely controls the driving motor by these switches;
When the back-up switch is pressed and the movable part is driven in the ascending direction, when the load current flowing through the driving motor becomes a predetermined value or more, the driving direction of the movable part is switched from the ascending direction to the descending direction. Means,
A back-raising bed device comprising: The switching means includes an overcurrent detection circuit for detecting an overcurrent flowing through the drive motor, and a switching element that operates in response to a detection signal from the overcurrent detection circuit to switch the rotation direction of the drive motor. The backrest type bed apparatus according to claim 1, wherein: 2. The back-up type bed apparatus according to claim 1, further comprising a timer circuit for controlling a driving time of the movable section in a downward direction by the switching means.

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