JP3558215B2 - Bed apparatus equipped with a bottom elevating mechanism having a pinch prevention function - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention, in particular bed apparatus having a bottom lifting mechanism, and so there is no danger enters for Children under the main frame, to a bed apparatus provided with a bottom lifting mechanism having a sandwiched protection.
[0002]
[Prior art]
Recently, electric bed devices have become popular not only in hospitals but also in homes. Further, in such an electric bed device , the floor has been lowered, and for this purpose, an electric bed device having an elevating mechanism has been increasing. The provision of this elevating mechanism makes it easy to use for both bed users and caregivers.
[0003]
[Problems to be solved by the invention]
However, if a child or the like accidentally enters the lower part of the main frame , operating the elevating mechanism and lowering the main frame without noticing this can be very dangerous.
Therefore, hitherto, such a problem has been dealt with by providing a mechanical contact type detecting means such as a touch sensor (tape switch) on the lower surface of the frame.
However, the mechanical contact type detection means has a limited installation place, does not operate unless directly contacting an obstacle, and has a narrow detectable range.
The present invention has been proposed in view of such a background, and even if a child or the like enters under the main frame , the non-contact type detection means can easily detect the child and stop the main frame or cause the main frame to reversely move up to a dangerous position. It is an object of the present invention to provide a bed device provided with a bottom elevating mechanism having a pinch prevention function, which is prevented from reaching.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, according to the present invention, the main frame supporting the bottom of the bed device having at least the bottom elevating mechanism according to claim 1 is supported so as to be able to move up and down by elevating legs constituting the bottom elevating mechanism. An infrared sensor is provided on the lower surface side of the center part of the frame, from the detection signal by this infrared sensor, the intrusion of the human body under the main frame is monitored, and when there is intrusion of the human body, the bottom is raised with the main frame or A bed device provided with a bottom elevating mechanism having a function of preventing pinching, in which the bottom elevating mechanism is operated to stop.
In the present invention also, in claim 2, together with an infrared sensor on the lower side of the main frame, placing a contact sensor for detecting a foreign matter under the bottom, when detecting foreign matter by the said contact sensor, a main frame In addition, the present invention proposes a bed device having a bottom lifting mechanism having a function of preventing pinching, in which a bottom lifting mechanism is operated to raise or stop the bottom .
[0005]
According to the first aspect, when a child is under the main frame , the child can be caught by the infrared sensor, and an operation command for lowering the main frame from the height at the time of use to the minimum floor height is issued. However, since a signal for stopping the main frame or a power signal for reverse rotation is provided to the drive source in the bottom lifting mechanism, the main frame does not hit the child.
[0006]
According to the second aspect, even if the foreign matter does not emit infrared light, the foreign matter under the main frame can be captured and the bottom elevating mechanism can be controlled. Can be avoided.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Next, a bed apparatus having a bottom elevating mechanism having a pinch prevention function according to the present invention will be described with reference to the accompanying drawings, showing one embodiment.
FIG. 1 shows a bed apparatus 1 provided with a bottom elevating mechanism. The bed apparatus 1 includes a base frame 2 grounded on a floor or the like, high-low links 3, 3 erected on the base frame 2, a main frame 4 supported by the high-low links 3, and a main frame 4. And a bottom 5 having a divided structure to be placed on the bottom.
[0008]
The base frame 2 has, at both ends of a pair of long longitudinal frames 2a, grounding leg members 2b, 2b that contact the floor, and a short frame (not shown) that connects the pair of long frames 2a. The high-low links 3 and 3 are mounted thereon.
That is, the high-low links 3 have an up-and-down arm 3a rotatably connected to a protruding portion 6 on a short frame connecting between the long frames 2a, and a connecting arm 3b is rotated at the tip of the up-and-down arm 3a. The connecting arm 3b is attached to a receiving frame 4a provided on the main frame 4 so as to support the main frame 4.
Further, a horizontal axis (not shown) is attached to the raising / lowering arm 3a in the frame width direction, and an interlocking arm 3c is protruded from the horizontal axis, and the interlocking arms 3c are connected to each other by an interlocking rod 7. And the horizontal axis is linked. A linear drive mechanism 8 is connected to the horizontal axis via an activation arm (not shown), and an operation control signal such as a hand switch (described later) is used to transmit an operation control signal via a controller 9 to the linear drive mechanism 8. And the linear motion drive mechanism 8 is activated to operate the raising and lowering arm 3a and the interlocking arm 3c to move the main frame 4 and the bottom 5 up and down.
[0009]
The bottom 5 is divided into a back bottom 5a corresponding to the back, a waist bottom 5b corresponding to the waist, a thigh bottom 5c corresponding to the thigh, and a shin bottom 5d corresponding to the shin. A curved bottom 5e and a curved bottom 5f, each of which has an appropriate curvature, are interposed between the bottom 5b and the thigh bottom 5c and the shin bottom 5d.
[0010]
In such a bed apparatus 1, pyroelectric infrared sensors 10, 10 are arranged at the center of the lower surface of the main frame 4, that is, at the lower surface of the portion supported from the waist bottom 5b to the thigh bottom 5c, near the end face in the bottom width direction. I have.
As shown in FIG. 3, the pyroelectric infrared sensor 10 includes a well-known pyroelectric element 11 and a dome-shaped infrared light condensing lens L for condensing infrared light from a surrounding area and a predetermined range. The incident infrared light is condensed by the infrared condensing lens L and made incident on the pyroelectric element 11, whereby the pyroelectric element 11 generates pyroelectricity and extracts a detection signal from a signal extraction electrode (not shown). I have to. The detection signal from the pyroelectric infrared sensor 10 is introduced into the controller 9 as shown in FIG. 4, and is supplied from the controller 9 to the linear drive mechanism 8 in the bottom lifting mechanism as an operation control signal. A signal line from the hand switch Rc is connected to the controller 9 so that an operation switch, that is, a signal according to an operation command from the hand switch Rc is introduced. It is set so that the detection signal from the pyroelectric infrared sensor 10 is processed with priority over the signal according to the operation command from.
The infrared sensor 10 allows a child or the like to enter a space surrounded by the base frame 2 and the high-low links 3 and 3 below the main frame 4, and changes in the range of infrared rays indicated by dotted lines in FIGS. As a result, an operation control signal is given from the controller 9 to the linear drive mechanism 8 in the bottom elevating mechanism, so that the bottom elevating mechanism is immediately stopped or the main frame 4 is raised.
[0011]
In the bed apparatus 1 provided with the above-described bottom elevating mechanism, the bottom 5 of the bed apparatus 1, that is, the elevating and lowering of the main frame 4 can be performed by the user as well as the caregiver by the hand switch Rc. By operating the hand switch Rc, a signal related to an operation command is introduced to the controller 9, and an operation control signal based on the operation command signal is sent from the controller 9 to the linear drive mechanism 8, and the up-and-down arm in the high-low link 3. The main frame 4 and the bottom 5 can be moved up and down by operating the 3a and the interlocking arm 3c.
[0012]
Here, when the child enters the space below the bottom 5, that is, the space surrounded by the long frame 2 a and the high-low links 3 and 3 in the main frame 4 and the base frame 2 while using the bed apparatus 1, the bed is used. Can not see it at all. In addition, even when the caregiver performs the raising / lowering operation by the hand switch Rc, the user on the bottom 5 pays attention, so that the state below the main frame 4 is not checked at all and the caregiver operates as it is. There are many.
[0013]
In such a state, the infrared sensor 10 disposed at the center of the lower surface of the main frame 4 can catch a child within the range of the dotted line shown in FIGS. Infrared rays from a child are incident on an infrared condenser lens L of the infrared sensor 10, and the incident infrared rays are condensed by the infrared condenser lens L to reach the pyroelectric element 11. Thus, the pyroelectric element 11 can generate pyroelectricity and extract it as a detection signal from a signal extraction electrode (not shown). At this time, when the child moves, the infrared ray emitted from the child also fluctuates, and the fluctuation of the infrared ray can be recognized as the presence of the child. Therefore, even if the user operates the hand switch Rc to lower the main frame 4, a detection signal relating to the fluctuation of the infrared rays is introduced to the controller 9, and the controller 9 controls the operation of the linear drive mechanism 8 in the bottom lifting mechanism. By giving a signal, the linear drive mechanism 8 can be stopped or reversely raised.
[0014]
Here, the user notices that an abnormality has occurred due to the stop of the lifting / lowering operation or the reverse rotation, and can call the caregiver to notify that the child is under the main frame 4. In this case, the main frame 4 does not come into contact with the child.
On the other hand, when operated by the caregiver, the child can be immediately rescued from under the main frame 4.
As described above, since the presence of a child in the space below the bottom 5 and below the main frame 4 can be detected by the infrared sensor 10 as the non-contact type detection means, it is a highly safe pinch prevention function. Can be.
Of course, a conventional touch sensor may be used in combination with the infrared sensor 10 that is a non-contact type detection unit. In this way, even if a foreign substance that cannot emit infrared rays is located below the main frame 4, the foreign substance can be caught by contacting the main frame 4, which leads to protection of the lifting mechanism.
The operation of the infrared sensor 10 causes the hand switch Rc, the board in the bed apparatus , and a notifying means (buzzer, warning lamp, etc.) provided in the room to generate a warning sound, a flashing light, and the like, so that the bed user Or a caregiver, it is possible to more reliably and quickly grasp the presence of a child under the bottom 5.
[0015]
【The invention's effect】
As described above, according to the present invention,
(1) There is no restriction on the installation location of the sensor.
(2) Since it is a non-contact detection means, the main frame or the like does not hit a child.
(3) The user can operate the lifting mechanism with ease.
(4) A bed device excellent in safety can be provided.
[0016]
[Brief description of the drawings]
FIG. 1 is a side view of a bed apparatus provided with a bottom elevating mechanism having a pinch prevention function according to the present invention.
FIG. 2 is a plan view of the bed device shown in FIG.
FIG. 3 is a schematic explanatory view of an infrared sensor applied to the bed device shown in FIG. 1;
FIG. 4 is an operation control block diagram showing a function for preventing pinching in the bed device shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bed apparatus 2 Base frame 2a Longitudinal frame 2b Grounding leg member 3 High-low link 3a Undulating arm 3b Connecting arm 3c Interlocking arm 4 Main frame 5 Bottom 5a Back bottom 5b Waist bottom 5c Thigh bottom 5d Shin bottom 5e, 5f Curved bottom 6 Projection 7 Interlocking rod 8 Linear drive mechanism 9 Controller 10 Infrared sensor 11 Pyroelectric element L Infrared condensing lens

Claims (2)

At least a bed apparatus having a bottom elevating mechanism, the main frame supporting the bottom is supported by the elevating legs constituting the bottom elevating mechanism so as to be able to ascend and descend. From the detection signal, the intrusion of the human body under the main frame is monitored, and when the invasion of the human body is detected, the bottom elevating mechanism is operated to raise or stop the bottom together with the main frame. A bed device provided with a bottom elevating mechanism having a pinch prevention function. An infrared sensor and a contact sensor for detecting foreign matter below the bottom are arranged on the lower surface side of the main frame, and when foreign matter is detected by the contact sensor, the bottom is raised or lowered together with the main frame to raise or stop the bottom. bed apparatus provided with a bottom lifting mechanism having a sandwiched protection of claim 1, wherein it has to operate the mechanism.

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