EP1843732B1 - Pflegebett mit symmetrierschaltung - Google Patents

Pflegebett mit symmetrierschaltung Download PDF

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Publication number
EP1843732B1
EP1843732B1 EP06701159A EP06701159A EP1843732B1 EP 1843732 B1 EP1843732 B1 EP 1843732B1 EP 06701159 A EP06701159 A EP 06701159A EP 06701159 A EP06701159 A EP 06701159A EP 1843732 B1 EP1843732 B1 EP 1843732B1
Authority
EP
European Patent Office
Prior art keywords
current
treatment bed
electric motors
bed according
motors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06701159A
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German (de)
English (en)
French (fr)
Other versions
EP1843732A1 (de
Inventor
Hans-Peter Barthelt
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1843732A1 publication Critical patent/EP1843732A1/de
Application granted granted Critical
Publication of EP1843732B1 publication Critical patent/EP1843732B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/002—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame
    • A61G7/012—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame raising or lowering of the whole mattress frame
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/002—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame
    • A61G7/018—Control or drive mechanisms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/10—Devices for lifting patients or disabled persons, e.g. special adaptations of hoists thereto
    • A61G7/16—Devices for lifting patients or disabled persons, e.g. special adaptations of hoists thereto converting a lying surface into a chair
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/002—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame
    • A61G7/015—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame divided into different adjustable sections, e.g. for Gatch position
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/05—Parts, details or accessories of beds
    • A61G7/053—Aids for getting into, or out of, bed, e.g. steps, chairs, cane-like supports
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/10—Devices for lifting patients or disabled persons, e.g. special adaptations of hoists thereto
    • A61G7/1073—Parts, details or accessories
    • A61G7/1076—Means for rotating around a vertical axis

Definitions

  • a nursing bed which has a height-adjustable base, which is arranged on the mattress frame.
  • the mattress frame with the patient lying on it should be brought from the normal bed height into a care height, which makes it easier for the staff to carry out operations on the patient in need of care.
  • the known bed has an electric motor which drives a screw via a worm gear.
  • the jackscrew extends between the foot of the base and its head to vertically extend the lifter of the socket.
  • the drive is self-locking.
  • the electric motor itself is a low voltage DC motor.
  • the supply voltage is approx. 24 volts DC.
  • EP1312330 discloses a nursing bed with all the technical features ⁇ > of the preamble of claim 1.
  • the nursing bed according to the invention has a height-adjustable base.
  • two electric motors are provided, which work kinematically in parallel. Since these electric motors are self-locking due to the threaded spindle drive, if no countermeasures are taken, tensions can occur which damage the bed and the motors. Because of the stiffness of the lever mechanism of the base to meet this small path differences of the electric motors.
  • a balancing circuit is additionally provided in the nursing bed according to the invention.
  • the balancing circuit measures the current consumption of the two electric motors, at least in the lifting operation. If it turns out that the difference between the two currents exceeds a predetermined level, the current is briefly interrupted for a constant, fixed predetermined time for the motor, which has shown during the measurement, the higher power consumption.
  • the nursing bed is developed in such a way that the Symmetierscrien measures the power consumption not only when lifting, but also when lowering.
  • the Symmetierscrien measures the power consumption not only when lifting, but also when lowering.
  • the larger current consumption shows the lagging motor because it is not supported by the load in the sense of returning to the normal position. Consequently, it is advantageous if in this operating situation the power supply to the motor is interrupted, which shows the smaller power consumption.
  • the balancing circuit is capable of learning. If the balancing circuit determines that the current difference has become larger rather than smaller after the power interruption, it will make the power interruption to the other motor and, as a result, make the short-term power interruption only to that motor.
  • a tolerance window is defined for the differences of the motor currents. The switching off of the motor current is only carried out when the difference leaves the tolerance window.
  • the tolerance window depends on the size of the current amount. The most favorable values must be determined empirically because they are dependent on the motors and construction of the bed.
  • FIG. 1 shows in a perspective view a nursing bed 1 in the lying position, while FIG. 2 the nursing bed 1 in the seat or chair position reproduces.
  • the nursing bed 1 has a Bettumrandung 2 with a head part 3, a foot part 4 and side walls 5 and 6.
  • the viewer facing side wall 5 is located in the reclining position as illustrated at a distance from the ground, so there is a gap between the lower edge of the side wall 5 and the bottom, which allows the nursing staff to deliver the toes under the bed.
  • the side wall 5 is movably mounted and arrives in the chair position of the nursing bed 1 in a postponed down position, as this FIG. 2 lets recognize.
  • the special storage of the side wall 5 is for example in detail in the DE 199 12 937 A1 explained.
  • To the bed lifter 7 include a height-adjustable base 8, on whose head a rotary hinge 9 is fixed with a vertical axis of rotation, an intermediate frame 10, and a reclining frame 11 on which a mattress 12 is located.
  • the reclining frame 11 is rectangular in plan view.
  • the reclining frame 11 is divided into a central portion 13 which is fixedly connected to the intermediate frame 10, a back portion 14 which is hinged to the central portion 13, a thigh portion 15 which is also hinged to the central portion 13, and a lower leg portion 16.
  • Der Lower leg portion 16 is hinged to the remote from the central portion 13 end of the thigh portion 15.
  • the hinge axes about which the sections 14, 15, 16 are movable relative to the central section 13 are horizontal.
  • the foot frame 11 still has a foot portion 17 which is rigidly connected directly to the base 8.
  • the central portion 13 of the reclining frame 11 has two mutually parallel longitudinal bars 18, which are spaced apart according to the width of the nursing bed 1. Because of the lateral view, the visible longitudinal spar 18 conceals the associated longitudinal spar of the central section 13 lying behind it.
  • the back portion 14 is bounded by a spar 19 and another parallel spar, which, because of the representation in FIG. 3 can not be seen.
  • the spar 19 is hinged to the spar 18 while the other concealed spar is connected to the longitudinal spar 18 parallel to the longitudinal beam.
  • the two spars 19 of the back portion 14 are connected to each other via a not visible in the figure cross member at the upper end at 20.
  • a further transverse strut 21 connects the two longitudinal members 19 at the bottom.
  • the thigh portion 15 is limited by two longitudinal beams, of which only a longitudinal beam 22 can be seen.
  • the other longitudinal spar is covered by the longitudinal spar 22.
  • the two longitudinal struts 22 are connected by a transverse strut 23.
  • the cross strut 26 extends approximately at the center of each longitudinal spar 22 at the bottom.
  • the lower leg portion 16 is bounded by two longitudinal beams, of which in turn only the longitudinal beam 24 can be seen in the figure.
  • the two longitudinal beams 24 are connected to each other at the lower end at 25 via an unrecognizable transverse strut.
  • the two longitudinal bars 24 are connected by a strut 26, are fastened to the two mutually parallel guide rails 27, which extend to the end 25. As shown, they extend at an angle to the longitudinal beam 24 in such a way that they converge in the direction of the foot end 25.
  • the distance between the two guide rails 27 is significantly smaller than the distance between the two longitudinal beams 24. Opposite these, the guide rails 27 are offset approximately 20 cm inwards.
  • All longitudinal bars 18, 19, 22, and 24 bear towards the center of the bed facing pins to this rubber molded parts with the longitudinal beams 18, 19, 22, and 24 to connect anchoring spring rods in a known manner, which extend across the width of the reclining frame 11 ,
  • the hinges which connect on each side of the bed 1 respectively adjacent longitudinal beams 18,19, 22, 24 with each other are shown schematically at 29, 30 and 31.
  • the lower leg portion 16 may be raised or lowered via an unillustrated electric motor.
  • the electric motor is coupled by a gear 32 and is located in the intermediate frame 10th
  • Another electric motor 33 is supported in the intermediate frame 10 and leads to the cross brace 21. In this way, the back portion 14 can be raised or lowered.
  • the two longitudinal members 18 of the central part 13 are rigidly connected to the intermediate frame 10.
  • the intermediate frame 10 is composed of a square frame welded together square tubes, of which only a square tube 34 can be seen.
  • the parallel square tube is hidden by the square tube 34.
  • the rectangular frame is narrower than the distance between the longitudinal members 18 corresponds to each other.
  • a total of four arms 35 are welded, of which two each carry a longitudinal beam 18.
  • the booms 35 are horizontal and perpendicular to the longitudinal axis of the nursing bed. 1
  • the rotary hinge 9 connects the intermediate frame 10 with the height-adjustable base 8. It consists of a ring 36 and a rotatably mounted in the ring 34 turntable 37 together. The fifth wheel 37 is bolted to the intermediate frame 10 via screws, not shown.
  • the exact structure of the rotary hinge 9 is in the DE 102 50 075 A1 which is incorporated herein by reference.
  • the height-adjustable base 8 include an upper frame 39 and a frame under 41, this consist of correspondingly welded together square tubes, of which two mutually parallel square tubes longitudinal bars 39a and 41a form.
  • the upper frame 39 is supported on the lower frame 41.
  • the rotary hinge 9 is connected to the upper frame 39.
  • the knee lever pairs 42, 43 are each located next to a longitudinal side of the base 8, so that the corresponding knee lever pairs 42, 43 on the other longitudinal side in the side view of FIG. 3 are not recognizable.
  • the toggle lever pair 42, 43 is composed of an upper toggle lever 44 and a lower toggle 45.
  • Each knee lever 42, 43 is hingedly connected to the upper and lower frames 39, 41, respectively, via a horizontal axis hinge 46 on the respective side of the bed. All axes of the hinges 46 are parallel to each other.
  • the hinges 46 are coaxial with their axes to the axes of the hinges of the unrecognizable toggle 42, 43.
  • Hinges 47 connect the toggle pairs 42, 43 to the lower frame 41.
  • the axes of the hinges 47 are parallel to the axes of the hinges 46, the axes of hinges 46, 47 corresponding to each other on both sides being coaxial with each other.
  • the two toggle pairs 42, 43 on each side of the base 8 are each coupled by an associated horizontal coupling strut 48 with each other.
  • Each coupling strut 48 is, as shown, hingedly connected to the knee joint 49 of each toggle lever pair 42,43.
  • an oblique coupling strut 50 connects the upper toggle lever 44 of the toggle pair 42 with the lower elbow arm 45 of the toggle pair 43. At least the aligned toggle 45 on both sides of the bed at the foot are connected by an undetectable shaft , The same applies to the two lower toggle 45 at the head end.
  • An electric lifting motor 51 which, like the electric motors 33, 38, is designed as a spindle motor, extends between the upper frame 39 and the lower frame 41. It is articulated next to the toggle lever 42 on a transverse strut 52 of the lower frame 41 indicated by dashed lines. Its other end is hinged to a hidden transverse strut of the upper frame 39, next to the toggle lever 43. The motor is thus directly between the two frames 39 and 41, it is crossed to the inclined coupling strut 50. A further lift motor is parallel to the visible Lifting motor 51 arranged and articulated in the same way. Because of the side view of the second hoist motor of the recognizable Hubmotor hidden. Both lifting motors act kinematically parallel and are arranged as close together as possible.
  • the toggle levers 42, 43 cooperate with the horizontal coupling strut 48 and the oblique coupling strut 50 as a kind of parallel guide for the relative movement of the two frames 39 and 41st
  • the lifting mechanism of the lifter 8 is very stiff in itself. Due to the immediately adjacent arrangement of the two lifting motors 51, it can very easily lead to tension between the lifting motors, if even small path differences occur. To make matters worse, that the two lifting motors 51 are so-called spindle motors. This drive is self-locking and able to generate very large forces.
  • Fig. 4 provided as a block diagram shown balancing circuit.
  • each lifting motor has an outer telescopic tube 52 and an inner telescopic tube 53, which has a rotatable screw 54, the in Fig. 4 is drawn in dashed lines, can be rotated in order to move the inner lifting tube 53 relative to the outer axially.
  • an electric motor 55 which drives the screw 54 via the aforementioned worm gear.
  • the lifting motor A has two current inputs 56 and 57, is supplied via the current in the low voltage range of about 24 - 48 volts.
  • the lifting motor B has the same basic structure, which is why there the same reference numerals are used to designate the mechanical components.
  • the motor B is powered by power supply inputs 58 and 59.
  • the two power supply inputs 56 and 58 are connected in parallel and lead via a line 61 directly to a terminal 62.
  • the terminal 57 leads to a controlled semiconductor switch 63, from there to a current sensor resistor 64 and via a line 65 to another power supply input 66th
  • the wiring of the power supply input 59 looks similar.
  • the power supply input 59 is connected to a controlled semiconductor switch 67, from where the power connection via a current sensor resistor 68 leads to the line 65 and thus to the power supply input 66.
  • the control of the two semiconductor switches 63 via a microprocessor / microcontroller 69. This has two outputs 71 and 72 which are connected to control inputs 73 and 74 of the two semiconductor switches 63 and 67.
  • the microprocessor 69 is connected in parallel with inputs 75, 76, 77 to the current sensing resistors 64 and 68.
  • inputs 75, 76, 77 there is an input 67 on the line 65 while the input 76 is connected to the junction between the current sensor resistor 68 and the semiconductor switch 67.
  • the input 75 is analogously to the current sensor resistor 64th
  • Behind the two inputs 75 and 76 are in the microprocessor 69 analog-digital converters capable of converting the voltage measured at the current sensing resistor 64 or 68 to a digital value that can be further processed by the program in the microprocessor 69.
  • control circuit To the power supply inputs 62 and 66 of the corresponding controlled output of a parent (not shown) control circuit is connected, via which the user controlled in a known manner by manual control, the two lifting motors A and B can run, depending on the operation in terms of lifting or sinking.
  • the button When the button is released, the power supply to the inputs 62 and 66 is switched off and the lifting motors A and B remain in the respective position self-locking.
  • the power supply of the microprocessor 69 is not further shown, as this is obvious to the skilled person and not the subject of the invention.
  • a current begins to flow, which leads from the power supply input 66 via the current sensor resistor 68, the conductive semiconductor switch 67 to the lift motor B and from there to the power supply terminal 62.
  • Another current flows from the power supply input 66 via the resistor 64, the semiconductor switch 63 to the lift motor A and from there to the power supply input 62nd
  • the respective currents flowing to the lifting motors A and B are detected continuously by the microprocessor 69 individually with the aid of the current sensor resistors 64 and 68.
  • the microprocessor 69 forms the difference between the currents I A and I B picked up by the lift motors A and B due to the voltages detected at the two resistors 64 and 68.
  • a query block 81 is then checked whether the amount of Current difference D is greater than an error F specified in the program. If this is not the case, the program of the microprocessor 69 may return to the input of the execution block 80 via a short wait loop if necessary.
  • the program continues with a query block 82.
  • the query block 82 it is checked whether the current I A is greater than the current I B.
  • the program therefore executes the instruction block 83, which causes the current for the lift motor A to be interrupted for a time t set in the program.
  • the microprocessor 69 provides at its output 71, a signal which brings the semiconductor switch 63 in the locked state.
  • the time t lies in the range between 0.01 sec. And 2 sec. The optimum value must be determined empirically.
  • the program branches to an instruction block 84 which causes microprocessor 69 to apply current I B to the duration of time t interrupts.
  • the microprocessor 69 provides at its output 82 a signal by which the semiconductor switch 67 is blocked during the time t.
  • the time for t must be chosen so that by repeatedly executing the instruction blocks 83 or 84, the currents I A and I B approach each other.
  • the time t is chosen too large, if after the power interruption for one or the other hoist motor A or B, the power consumption significantly reverse, ie by more than the value F.
  • t should be chosen so that the instruction blocks 83 and 84 are not executed consecutively because, for example, after executing the instruction block 83, the reverse error is present and the error differential current has now become greater than the tolerance value F.
  • the size of t should be adjusted to the duration of the program run, so as quickly as possible symmetrization between the lifting motors A and B. occurs.
  • the lifting motor is stopped at the same time for a short time, so that the other can still catch up with power stroke engine way.
  • both the size of the still permissible differential current F and the turn-off time t is dependent on the measured currents.
  • the two semiconductor switches 63 and 67 can be bridged by dashed diodes 86 and 87, as shown.
  • diodes 86 and 87 are not to be used and, instead, semiconductor switches 63 and 67 which allow both current directions. This can optionally also be achieved by anti-parallel MosFETs.
  • a nursing bed has in the height-adjustable lift two mechanically parallel-connected hoist motors.
  • a balancing circuit is provided which measures the supply currents of the hoist motors. If a difference emerges, the relevant current is interrupted several times briefly in the sense that the magnitude of the currents approaches each other as a result of the power interruptions.

Landscapes

  • Health & Medical Sciences (AREA)
  • Nursing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Invalid Beds And Related Equipment (AREA)
  • Control Of Multiple Motors (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
EP06701159A 2005-02-04 2006-01-13 Pflegebett mit symmetrierschaltung Not-in-force EP1843732B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005005471A DE102005005471A1 (de) 2005-02-04 2005-02-04 Pflegebett mit Symmetrierschaltung
PCT/EP2006/000250 WO2006081925A1 (de) 2005-02-04 2006-01-13 Pflegebett mit symmetrierschaltung

Publications (2)

Publication Number Publication Date
EP1843732A1 EP1843732A1 (de) 2007-10-17
EP1843732B1 true EP1843732B1 (de) 2009-04-29

Family

ID=36096455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06701159A Not-in-force EP1843732B1 (de) 2005-02-04 2006-01-13 Pflegebett mit symmetrierschaltung

Country Status (8)

Country Link
US (1) US7861340B2 (ja)
EP (1) EP1843732B1 (ja)
JP (1) JP4851471B2 (ja)
CN (1) CN101111210B (ja)
AT (1) ATE429890T1 (ja)
CA (1) CA2595828A1 (ja)
DE (2) DE102005005471A1 (ja)
WO (1) WO2006081925A1 (ja)

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Also Published As

Publication number Publication date
JP2008528216A (ja) 2008-07-31
WO2006081925A1 (de) 2006-08-10
US20080148485A1 (en) 2008-06-26
DE102005005471A1 (de) 2006-08-24
CN101111210A (zh) 2008-01-23
CN101111210B (zh) 2010-11-03
CA2595828A1 (en) 2006-08-10
EP1843732A1 (de) 2007-10-17
US7861340B2 (en) 2011-01-04
JP4851471B2 (ja) 2012-01-11
ATE429890T1 (de) 2009-05-15
DE502006003599D1 (de) 2009-06-10

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