JP2015087173A - Bed load detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bed load detector whose signal cable is easily maintained in a state of being spaced apart from a floor surface.SOLUTION: A bed load detector includes: a placing part 50 placing a leg part 2 of a bed thereon; a strain body 40 that is deflected and deformed by receiving a load from the placing part 50; a base plate 30 that supports the strain body 40; a sensor unit that is attached to the strain body 40 to detect a deformation amount of the strain body 40; and a cover body 60 that stores the placing part 50, the strain body 40, the base plate 30, and the sensor unit. A cable guide part 65 that pulls out a signal cable 48 connected to the sensor unit to an upper side of the cover body 60 is formed in the cover body 60.

Description

  The present invention relates to a bed load detection device that detects a load variation of a subject who has landed on a bed.

  In medical facilities and nursing care facilities, there are load detection devices that detect body movements of subjects who sleep or rest on a bed, for example, in order to grasp the health of subjects such as patients, infants, the elderly, and cared persons. To do.

The load detection device disclosed in Patent Document 1 is interposed between a leg portion of a bed and a floor surface, and detects a load received from the bed leg portion by a strain sensor. The detected sensor signal is analog / digital converted and output as a digital signal. The digital signal is input to the calculation means via a signal cable connected to the load detection device, and the presence status of the subject is calculated by the calculation means.
Also in the load detection device disclosed in Patent Document 2, the load from the leg of the bed is detected by a strain sensor, and the detection signal is analog / digital converted and output as a digital signal. The digital signal is input to the calculation means via a signal cable connected to the load detection device.

JP 2012-88323 A JP 2008-12202 A

  The signal cable for transmitting the digital signal output from the load detection device to the computing means needs to have a sufficient length for wiring, and is usually placed on the floor surface. However, if the signal cable placed on the floor is left as it is, it may interfere with movement of people and other objects, and processing such as attaching a protective cover is required. In addition, the signal cable placed on the floor may be an obstacle when cleaning the floor.

  An object of the present invention is to provide a bed load detection device in which a signal cable is easily held in a state of being separated from a floor surface.

The first characteristic configuration of the bed load detection device according to the present invention is a mounting unit on which a bed leg is placed;
A strain body that flexes and deforms in response to a load from the mounting portion; a base plate that supports the strain body; and a sensor unit that is attached to the strain body and detects a deformation amount of the strain body;
A cable that includes the mounting portion, the strain body, the base plate, and a cover body that houses the sensor unit, and that draws a signal cable connected to the sensor unit to the cover body above the cover body. The guide portion is formed.

  By forming the cable guide portion on the cover body as in this configuration, the signal cable can be reliably pulled out above the cover body. Since the upper part of the cover body is away from the bed placement surface, the signal cable can be easily separated from the bed placement surface. The drawn signal cable can be easily along the bed frame separated from the bed placement surface, and the signal cable can be easily maintained in a state separated from the bed placement surface.

  A second characteristic configuration of the bed load detection device according to the present invention is that the cable guide portion includes a first fixing portion that holds the signal cable so as to prevent displacement.

  As in this configuration, when the cable guide portion includes the first fixing portion that holds the signal cable so as to prevent displacement, the signal cable is held by the first fixing portion and securely held in that position. The Therefore, it is easy to maintain the signal cable in the upward posture in the cable guide portion.

  A third characteristic configuration of the bed load detection device according to the present invention is that a second fixing portion for latching the signal cable is provided on the base plate.

When a tensile force is applied to the signal cable drawn upward by the cable guide portion, this tensile force may act directly on the connector portion connected to the strain generating body. In this case, the connector part is affected by the tensile force, so that the detection result output from the connector part may fluctuate.
Therefore, as in this configuration, the base plate is provided with a second fixing portion for latching the signal cable. By providing the base plate with the second fixing portion, the position of the signal cable hooked on the second fixing portion can be maintained even when the signal cable is pulled upward. Thereby, the effect | action to the connector part by the tensile force of a signal cable can be blocked | prevented.

It is a schematic perspective view which shows the use condition of the load detection apparatus for beds. It is a perspective view of the load detection apparatus for beds. It is a sectional side view of the load detection apparatus for beds. It is a top view of the load detection apparatus for beds. It is a disassembled perspective view of the load detection apparatus for beds. It is a figure which shows another embodiment of a baseplate. It is a figure which shows another embodiment of a mounting part. It is a figure which shows another embodiment of a mounting part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a bed load detection device (hereinafter abbreviated as a load detection device) 10 is disposed at a position corresponding to each leg 2 of the bed 1 on the bed installation surface, and the subject enters the floor. Used to detect bed movement, body movement, and the like. The bed installation surface is a hospital room, an examination room, an examination room, a floor surface of a bedroom, or the like.

  An output signal from the load detection device 10 is input to the calculation means 11 via, for example, a signal cable, and the subject's bed situation is calculated. The occupancy status calculated by the calculation means 11 may be notified to the notification subject by, for example, a communication means or a notification means, or may be monitored by a display means.

  On the bed 1, healthy persons, sick persons, infants, elderly people, and the like as subjects are in a lying position for sleep, rest, examination, examination, and the like. The bed 1 is not limited to sleeping or resting, and may be an examination table, an examination table, a stretcher, a sofa, or the like.

  As shown in FIGS. 2 to 5, the load detection device 10 includes a bottom cover 20, a base plate 30, a strain body 40, a sensor unit 41, a placement unit 50, a cover body 60, and a spacer 70. The base plate 30 is provided with two support shafts 31 and 32 for supporting the strain body 40 and the bracket 42. A hole 33 is formed between the support shafts 31 and 32.

  The strain body 40 has a substantially rectangular plate shape, and is deformed by receiving a load from the placement portion 50. A sensor unit 41 that detects the amount of deformation of the strain body 40 is attached to the strain body 40. The sensor unit 41 includes a strain sensor of the strain generating body 40 (for example, strain gauges G1 and G2 attached to the surface of the strain generating body 40), a bracket 42, and an amplifier device for amplifying signals from the strain gauges G1 and G2. 45, an FPC board connected to the strain gauges G1 and G2 and the amplifier device 45 is provided.

  Holes 40 a and 40 b are formed at both ends of the strain generating body 40. The bracket 42 is disposed on the upper surface of the strain body 40. The bracket 42 is provided with support holes 42a and 42b at both ends thereof, and is formed so as to extend to the side of the strain generating body 40, in other words, in a direction orthogonal to the extending direction of the strain generating body 40. . The support shafts 31 and 32 of the base plate 30 are inserted into the hole portions 40 a and 40 b of the strain body 40 and the support hole portions 42 a and 42 b of the bracket 42, and the nuts 43 and 43 are screwed onto the support shafts 31 and 32. Thus, the strain body 40 and the bracket 42 are fixed to the base plate 30.

  The strain body 40 is sandwiched between the bracket 42 and the ring-shaped base portion 40c. The strain body 40 fixed to the base plate 30 has a degree of freedom in the longitudinal direction (the direction connecting the holes 40a and 40b) and is restricted from moving in the direction intersecting the longitudinal direction.

  A connecting shaft (bolt) 44 for connecting the mounting portion 50 is erected at the center of the strain generating body 40. The connecting shaft 44 is inserted from below into a hole formed in the central portion of the strain body 40, and a washer 44 a is fitted from above the strain body 40. Contact between the bottom 44 b of the connecting shaft 44 and the base plate 30 is avoided by the hole 33. The bracket 42 is equipped with an amplifier device 45 for amplifying signals from the strain gauges G1 and G2. A sensor-side connector 46 is connected to the amplifier device 45, and a cable-side connector 47 that transmits the output of the amplifier device 45 to the electronic control unit (calculation means) 11 is connected to the sensor-side connector 46. The cable side connector 47 is provided with a signal cable 48.

  The mounting portion 50 includes a cylindrical portion 52 on the outer periphery of a circular flat plate body 51, and a concentric concave portion 53 having a depressed central portion is formed. The flat plate 51 is formed with a bar-like portion 54 that protrudes downward. The mounting portion 50 is connected to the strain body 40 by screwing the connecting shaft 44 into the inner groove portion formed in the rod-like portion 54.

  The cover body 60 houses the base plate 30, the strain body 40, the sensor unit 41, and the placement unit 50. The cover body 60 includes a first cover portion 61 that houses the bracket 42, the amplifier device 45, and the placement portion 50, a second cover portion 62 that houses the sensor side connector 46, the cable side connector 47, and the signal cable 48, Have The first cover portion 61 is formed in a cylindrical shape, and the second cover portion 62 is formed continuously from a part of the outer periphery of the first cover portion 61 and includes an upper surface cover 62a. On the inner peripheral surface of the first cover portion 61, vertical ribs 63 are provided at predetermined intervals. The rib 63 enhances the synthesis of the first cover portion 61, and the lower end portion of the rib 63 comes into contact with the upper surface of the base plate 30 to position the first cover portion 61. Claw portions 64 facing inward are formed on the bottoms of the first cover portion 61 and the second cover portion 62, respectively. With the lower end portion of the rib 63 in contact with the upper surface of the base plate 30, the claw portion 64 engages with the engaging portion 35 of the base plate 30, and the cover body 60 is fixed to the base plate 30. An annular spacer 70 having a hole 71 is detachably mounted on the mounting portion 50.

  When a load acts on the strain generating body 40 via the connecting shaft 44, the strain generating body 40 bends in a state where both ends are supported by the support shafts 31 and 32. At that time, on the surface of the strain generating body 40, between each of the support shafts 31, 32 and the connecting shaft 44, a compressive strain is generated on the support shafts 31, 32 side in proportion to a load, and a tensile strain is formed on the connecting shaft 44 side. Occurs. The strain gauges G1 and G2 detect these compressive strains and tensile strains.

  For example, a bridge circuit is configured by the strain gauges G <b> 1 and G <b> 2, and an electric signal corresponding to the deflection of the strain generating body 40, i.e., the load applied to the strain generating body 40 is output. It should be noted that not only the setting is made so that the compressive strain is generated on the support shafts 31 and 32 side and the tensile strain is generated on the connecting shaft 44 side, but the compressive strain or the tensile strain is set only on the support shafts 31 and 32 side. In some cases, the connecting shaft 44 may be set so that compressive strain or tensile strain is generated.

  In the bed 1 arranged on the load detection device 10, when the subject lands on the bed 1, the subject's load acts on the strain body 40 from the leg portion 2 through the placement portion 50. Thereby, the center part of the strain body 40 supported at both ends by the support shafts 31 and 32 is bent, and the surface of the strain body 40 is between the support shafts 31 and 32 and the connecting shaft 44. In proportion to the load, compressive strain is generated on the support shafts 31 and 32 side, and tensile strain is generated on the connecting shaft 44 side. These compressive strain and tensile strain are detected by the strain gauges G1 and G2, and the detection outputs of the strain gauges G1 and G2 are amplified by the amplifier device 45. The detection output amplified by the amplifier device 45 is transmitted to the electronic control unit (arithmetic unit) 11 by the signal cable 48 via the sensor side connector 46 and the cable side connector 47.

  Thus, based on the deformation amount of the strain body 40, the load of the subject who is to land on the bed 1 is detected. And a test subject's state can be grasped | ascertained appropriately by detecting the variation | change_quantity of the load based on a detection result.

  When the shape of the concave portion 53 of the placement portion 50 does not match the shape of the bottom portion of the leg portion 2 of the bed 1, the leg portion 2 placed on the placement portion 50 is moved by the movement of the subject on the bed 1. The position is easily moved. If the leg part 2 moves in the mounting part 50, it will shake in the load received from the mounting part 50, and the precision of load detection will fall. Therefore, the load detection device 10 includes a guide mechanism that regulates the placement position of the leg portion 2 of the bed 1. The guide mechanism is constituted by an annular spacer 70, for example. The outer shape of the spacer 70 is the same as that of the flat plate 51, and the hole 71 is formed in the same shape as the outer peripheral shape of the bottom of the leg 2. Thereby, since the leg part 2 mounted in the mounting part 50 contact | abuts to the internal peripheral surface of the hole 71, and a mounting position is controlled, the position of the leg part 2 is hold | maintained stably. As a result, the strain generating body 40 appropriately receives the load from the placement unit 50, and the load detection accuracy of the bed 1 is improved.

  By preparing a plurality of spacers 70 having different inner diameters of the holes 71, it is possible to easily cope with beds having different leg shapes. The hole 71 may be formed in a square shape in accordance with the shape of the leg 2.

  The mounting portion 50 is formed with a concentric recess 53 having a depressed central portion. Therefore, the guide mechanism may be configured such that the shape of the recess 53 matches the shape of the bottom of the leg 2 of the bed 1.

  The cover body 60 is formed with a cable guide portion 65 that pulls out the signal cable 48 connected to the sensor unit 41 to the upper side of the cover body 60. The cable guide portion 65 is formed in the vertical direction at the connection portion between the first cover portion 61 and the second cover portion 62. By guiding the signal cable 48 to the cable guide portion 65, the signal cable 48 can be reliably pulled out above the cover body 60. Since the upper side of the cover body 60 is a direction away from the bed placement surface, the signal cable 48 can be easily separated from the bed placement surface. The drawn signal cable 48 can be easily along the bed frame separated from the bed placement surface, and the signal cable 48 can be easily maintained in a state separated from the bed placement surface.

  The cable guide portion 65 includes a first fixing portion 66 that holds the signal cable 48 so as to prevent displacement. The first fixing portion 66 is configured such that the first cover portion 61 side is opened and the grip portion 66a is urged in the closing direction. As a result, the signal cable 48 is gripped by the first fixing portion 66 and reliably held at that position. Therefore, it is easy to maintain the signal cable 48 in the upward posture in the cable guide portion 65.

  If the first fixing portion 66 is at a position that is substantially the same as or lower than the upper position of the tubular portion 52 of the placement portion 50, the leg portion 2 of the bed 1 may ride on the first fixing portion 66. If so, the signal cable 48 may come into contact with the leg portion 2 above the first fixing portion 66 and the signal cable 48 may be damaged. For this reason, the first fixing portion 66 is provided on the upper portion of the cable guide portion 65, and the position of the first fixing portion 66 is set to be higher than the upper position of the tubular portion 52 of the placement portion 50. . If it carries out like this, the leg part 2 of the bed 1 will become difficult to get on the 1st fixing | fixed part 66, and the signal cable 48 above the 1st fixing | fixed part 66 is prevented from contacting with the leg part 2. FIG.

When a tensile force is applied to the signal cable 48 drawn upward by the cable guide portion 65, this tensile force may directly act on the cable-side connector 47 connected to the sensor-side connector 46. In this case, since the cable side connector 47 is affected by the tensile force, the detection result output from the cable side connector 47 may vary.
Therefore, the base plate 30 is provided with a second fixing portion 49 for latching the signal cable 48. The second fixing portion 49 includes a holding portion 49a biased in the closing direction, and the signal cable 48 is held by inserting the signal cable 48 into the holding portion 49a. The second fixing portion 49 is attached to the screw receiving portion 34 of the base plate 30 by an attaching screw 49b. By providing the base plate 30 with the second fixing portion 49, the position of the signal cable 48 hooked on the second fixing portion 49 can be maintained even when the signal cable 48 is pulled upward. Thereby, the action on the cable side connector 47 due to the tensile force of the signal cable 48 can be prevented.

[Another embodiment]
(1) In the above embodiment, the example in which the second fixing portion 49 is fixed to the base plate 30 using the mounting screw 49b has been shown. However, as shown in FIG. A part of the part may be formed by bending. The base plate 30 has an engaging portion 35 with which the claw portion 64 of the cover body 60 is engaged. Therefore, when forming the base plate 30, the engaging part 35 and the 2nd fixing | fixed part 49 can also be processed simultaneously.

(2) In the above embodiment, the example in which the position of the leg portion 2 on the mounting portion 50 is regulated using the spacer 70 has been shown. However, the spacer 70 is not used and the center portion of the mounting portion 50 is depressed. The position of the leg 2 may be regulated by the concentric recess 53. The mounting unit 50 may be configured to be exchangeable by preparing a plurality of parts having different diameters of the recesses 53.

(3) As shown in FIG. 7, the mounting portion 50 may form concentric concave portions 53 in a step shape (a plurality of step portions 55). When the concentric concave portion 63 formed in the mounting portion 50 is formed in a step shape, the leg portion 2 is placed in any of the concave portions 53 (step portions 55). Furthermore, since the position shift of the leg part 2 from the said mounting position to a radial direction outer side is controlled by the wall surface of an adjacent outer step part, the position setting of the leg part 2 with respect to the mounting part 50 is performed correctly. Thereby, even if it is the bed 1 from which the outer diameter of the leg part 2 differs, the detection accuracy of a load can be maintained correctly.

(4) As shown in FIG. 8, the mounting portion 50 may be formed by an inclined surface 56 in which concentric concave portions 53 are continuous. When the concentric concave portion 53 is formed by the continuous inclined surface 56, the mounting position is determined in a state where the leg portion 2 is always in contact with the inclined surface 56 regardless of the outer diameter of the leg portion 2. Thereby, the stable installation state of the leg part 2 can be obtained, and the load detection accuracy can be further improved.
Such a continuous inclined surface 56 may be formed in a conical shape as shown in FIG. 8, or may be formed in a curved surface like a sphere. Further, the degree of inclination may be arbitrarily changed between the center portion and the outer edge portion of the placement portion 50.

  The bed load detection device according to the present invention can be widely used for beds and bedding provided with legs.

DESCRIPTION OF SYMBOLS 1 Bed 2 Leg part 10 Load detection apparatus 30 Base plate 40 Strain body 41 Sensor unit 48 Signal cable 49 2nd fixing | fixed part 50 Mounting part 53 Recessed part (guide mechanism)
55 Step (Guide mechanism)
56 Inclined surface (guide mechanism)
60 Cover body 65 Cable guide portion 66 First fixing portion 70 Spacer (guide mechanism)
G1, G2 Strain gauge (Strain sensor)

Claims (3)

A placement section for placing the leg of the bed;
A strain body that flexes and deforms in response to a load from the mounting portion;
A base plate that supports the strain body;
A sensor unit that is mounted on the strain body and detects a deformation amount of the strain body;
The mounting unit, the strain body, the base plate, and a cover body that houses the sensor unit,
A load detecting device for a bed, wherein a cable guide portion for pulling out a signal cable connected to the sensor unit to the upper side of the cover body is formed on the cover body.   The bed load detection device according to claim 1, wherein the cable guide portion includes a first fixing portion that holds the signal cable so as to prevent a displacement of the signal cable.   The bed load detection device according to claim 1, wherein the base plate includes a second fixing portion that latches the signal cable.

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