JP4788987B2 - bed - Google Patents

Description

[0001]
The present invention relates to a bed that has a weight sensor installed on each leg portion of the bed and can measure at least a biological state such as a body weight of a person staying on the bed.
[0002]
[Prior art]
A bed with a conventional bed scale weight scale has a relatively high bed rigidity to reduce the deviation of the detection value of the different leg depending on the installation conditions, and the detection value is applied by preloading the bed before installation. It was only calibrated and the horizontal balance of each leg was adjusted after installation.
[0003]
[Problems to be solved by the invention]
However, in the above method, the calibration of the weight is performed in advance in a factory with relatively high floor flatness and rigidity. Therefore, the floor conditions of the actual installation location, for example, the flatness of the floor, Due to differences in rigidity, floor inclination, etc., problems that differ from actual detection results occur. Further, in order to correct this, if the rigidity of the bed itself is increased, there is a problem that the cost increases or the weight increases.
[0004]
For this reason, the present invention is to provide a bed that can cope with different installation conditions and can perform highly accurate detection.
[0005]
[Means for Solving the Problems]
Therefore, the present invention provides a bed scale weight scale that is provided on at least four legs that support the bed, measures the load applied to each leg, and a bed that stays on the bed based on the detection result of the bed scale weight scale. In a bed having display means for displaying a biological condition such as a weight of a measurer, the bed scale weight scale is attached to each leg part, and a weight sensor for measuring a load applied to the leg part, And a calibration device that calibrates the detection value of the weight sensor that varies depending on the installation conditions of the bed after installation.
[0006]
Therefore, according to the present invention, the detection value of the weight sensor is calibrated to the correct value by the calibration device after the bed is installed, and the detection value of the weight sensor is made accurate. Can do.
[0007]
Further, in the present invention, the calibration device includes a load meter that is detachably attached to a bottom end portion of each leg after the bed is installed, a load value detected by the load meter, and the weight sensor. It is desirable that calibration is performed by calibration means for calibrating the detection value of the weight sensor so that the detected value coincides with the detected value. Further, it is desirable that the calibration means rewrites a conversion formula for converting a detection signal from the weight sensor into a load value. Furthermore, it is desirable that the calibration device be removed after calibration of the detection value of the weight sensor.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
The bed shown in FIGS. 1 (a) and 1 (b), that is, a bed 1 with a bed scale weight scale, has four legs 2 that support the bed, and each of the legs 2 has a weight sensor. 3 is mounted, and the load applied to each of the leg portions 2 is detected.
[0010]
The detection signal of the weight sensor 3 is sent to the calculation display unit 4, where the state of the person to be measured who stays on the bed, the body weight, the pulse, the respiratory rate, the number of lie down, etc. are calculated, The calculation result is displayed.
[0011]
Specifically, as shown in FIG. 2, the calculation display unit 4 includes a calculation unit 5 and an operation display unit 6, and detection signals of the four weight sensors 3 (3a, 3b, 3c, 3d) Are sent to the A / D converter 7 of the arithmetic unit 5 housed in the arithmetic display unit 4 and converted into a digital signal, and further stored in the weight signal converter 8 in the weight signal converter 8. The weight signal is converted in accordance with a predetermined mathematical formula and calculation map.
[0012]
The converted weight signal is sent to the central processing unit 9 to read and process an appropriate program from a memory (for example, ROM) 10 in which a predetermined program is stored, and the calculated signal is stored in the memory. (For example, RAM) 11 is converted into a predetermined signal, weight display signal, pulse display signal, respiration rate display signal, etc. by being stored in or taken out from the display 11 and output to the display unit 12 of the operation display unit 6 for display. Each information is displayed on the part 12. Further, setting signals for the operation switches 13 and 14 of the operation display unit 6 are sent to the central processing unit 9. In this embodiment, for example, the operation switch 13 is an on / off switch, and the operation switch 14 is a display changeover switch.
[0013]
However, the detection signal of the weight sensor 3 (3a, 3b, 3c, 3d) and the weight signal are normally calibrated so as to have correct values by placing a predetermined weight on the bed at the time of factory shipment. However, the place where the bed is installed is usually different in conditions from the calibrated place, and in particular, the detection value differs depending on the rigidity, flatness, inclination, etc. of the floor of the bed installation place. For this reason, the calibration apparatus 20 is provided in the bed 1 of the present invention.
[0014]
The calibrating device 20 includes a rewriting device 22 for rewriting a conversion formula or map stored in the weight signal converting unit 8, and four plate-types for detecting a load applied to the leg 2 on the rewriting device 22. It is comprised by the load meter (load sensor) 21 (21a, 21b, 21c, 21d).
[0015]
As a result, when the bed 1 is carried in and placed at a predetermined position, the dish-shaped load sensor 21 is arranged at the lower end of the leg 2 having the weight sensor 3 of the bed 1 and is connected to the rewriting device 22. Then, the load applied to each of the leg portions 2 is measured. The rewrite device 22 reads the output value (weight signal) of the weight signal converter 8 and displays it. At this time, when the load by the load sensor 21 is W1 [Kg] and is different from the weight signal W2 of the weight signal conversion unit 8, the weight signal is configured as W1.
[0016]
As an example, when the weight signal W2 is calculated by W2 = K · f (Vs), as shown in FIG. 3, the calculation constant K is changed so that the output value Vs of the weight sensor 3 becomes the weight signal W1. By doing so, weight calibration is performed [W1 = K1 · f (Vs)].
[0017]
When the values of the weight sensors 3 of the respective leg portions 2 are all calibrated to the values of the load sensor 21, the load sensor 21 is detached from the leg portions 2 and measurement is performed only by the weight sensor 3. Is.
[0018]
【The invention's effect】
As described above, according to the present invention, the weight sensor that measures the load of the bed can be calibrated at the installation site of the bed, so that the installation conditions, for example, the flatness, rigidity, inclination, etc. of the floor are different. The load can be accurately measured even at the place. For this reason, there is no need to increase the rigidity of the bed itself, so that the weight of the bed can be reduced.
[0019]
Furthermore, since it is possible to install a weight sensor on an existing bed, the cost can be reduced.
[Brief description of the drawings]
FIG. 1 (a) is a side view of a bed according to an embodiment of the present invention, and FIG. 1 (b) is a bottom view.
FIG. 2 is a schematic configuration diagram of the inside of the calculation display unit.
FIG. 3 is a characteristic diagram showing a conversion formula stored in a weight conversion unit.
[Explanation of symbols]
1 Bed 2 Leg 3 (3a, 3b, 3c, 3d) Weight sensor 4 Calculation display unit 5 Calculation unit 6 Operation display unit 20 Calibration device 21 Load sensor 22 Rewriting device

Claims (2)

A bed scale weight scale that is provided on at least four legs that support the bed, and measures the load applied to each leg, and the weight of the person staying on the bed based on the detection result of the bed scale weight scale, etc. In a bed comprising display means for displaying biological conditions,
The bed scale weight scale is attached to each leg, and a weight sensor that measures a load applied to the leg, and a detection value of the weight sensor that varies depending on the installation condition of the bed after the bed is installed is calibrated. And a load meter detachably attached to the bottom end of each leg after the bed is installed, the load value detected by the load meter and the weight A calibration unit that calibrates the detection value of the weight sensor so that the detection value detected by the sensor matches, and the calibration unit converts the detection signal from the weight sensor into a load value. A bed characterized by comprising rewriting means for rewriting . The calibration apparatus, bed of claim 1, wherein the removed after the calibration of the detected value of the weight sensor.

Images