WO2004034945A1 - An electrical drive system - Google Patents
An electrical drive system Download PDFInfo
- Publication number
- WO2004034945A1 WO2004034945A1 PCT/DK2003/000710 DK0300710W WO2004034945A1 WO 2004034945 A1 WO2004034945 A1 WO 2004034945A1 DK 0300710 W DK0300710 W DK 0300710W WO 2004034945 A1 WO2004034945 A1 WO 2004034945A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conductors
- actuator
- hand control
- signal
- cable
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2829—Testing of circuits in sensor or actuator systems
Definitions
- the present invention relates to an electrical drive system comprising at least an actuator, a control unit connected to the actuator, a hand control connected to the control unit by a multi-core hand control cable with a common conductor as well as a plurality of individual conductors., said hand control comprising a plurality of function keys connected to the common conductor and to individual conductors for the control of the actuators.
- Such a drive system is generally incorporated in adjustable articles of furniture, and by way of example reference is made to EP 498 111 B1 and EP 488 552 both to J. Nesbit Evans & Company Limited, which together describe a hospital bed where the mattress support as a whole may raised/lowered as well as be tilted about a transverse axis and additionally be profiled by rotation of the backrest and the legrest.
- the patient can operate the bed by a hand control connected to the control unit by a cable.
- the hand control cable which must necessarily be of a certain length, is liable to be damaged because it may accidentally be jammed at the mov- able parts in the bed. Complete cutting/tearing of the cable is annoying, of course, but involves no immediate danger to the patient, which may be the case by partial damage where some of the conductors in the cable are short-circuited. Such a type of damage is not always visible on the external sheath of the cable, but the insulation around the individual conductors may very well have been stripped. If the patient wants to adjust the backrest, then a damaged cable may e.g. cause the legrest to be activated at the same time, which may be a nuisance and at worst dangerous to the patient.
- the object of the invention is to provide security against mis- adjustment for the user of the article of furniture, if the hand control cable is torn partly across and two or more conductors are short-circuited.
- the drive system is provided with a signal generator which, in case of a current in the common conductor, because of activation of a function key on the hand control, transmits a signal (signals) through conductors in the hand control cable from one end of these, as well as a detector for detecting the signal at the other end of the conductors and adapted such that if one or more of predetermined conductors are short- circuited, it omits applying a signal (signals) to the control unit to activate the actuator or actuators concerned, in the alternative stops it or them, at least self-runners may be avoided and thereby critical situations. In a fur- ther development of the invention it is also possible to avoid some of the co-runners. An embodiment of the invention will be explained more fully below with reference to the accompanying drawing. In the drawing:
- Fig. 1 shows a schematic diagram
- fig. 2 shows a survey of short-circuit constellations in the hand control cable.
- the diagram shown in fig. 1 just illustrates the parts necessary for the un- derstanding of the invention.
- the common parts such as an actuators, power supply, etc., are omitted.
- CB indicates a controller, K a hand control cable, and HB a hand control.
- the control unit comprises four relays K1A, K1 B; K2A, K2B which in pairs control their respective actuators.
- the cable comprises five conductors 1-5.
- the hand control comprises four function keys 6, 7, 8, 9 connected to a common conductor 1 and by individual conductors 2-5 to the respective relays.
- a current in the common conductor is detected by a detector 11 by means of the voltage drop across a pair of diodes.
- the voltage drop across the pair of diodes is so small as to be insignificant relative to the structure in general.
- the detector activates a pulse generator 12 which transmits pulses through the individual conductors 2-5, and the control unit includes another detector 13 to catch these signals.
- the detector 13 in the control unit detects if one or more of the individual conductors are short-circuited with the common conductor.
- the control unit is then adapted such that the motor relays K1A, K1 B; K2A, K2B are not activated, whereby the power to the motors is not turned on, or if the short-circuit occurs during running, then the relays are deactivated and the power to the motors is turned off, e.g. in that a FET in the control unit (the H-bridge to the motor) is connected to the detector 13 and is allowed to be turned on only when a signal is received from the signal generator as an indication of the cable being intact.
- a short-circuit between the individual conductors 2 and 3 or 4 and 5 will draw both of the respective relays, and the non-activated actuator can thus not start.
- the hand control cable may be damaged during running with an actuator in that it gets jammed, but the cable may also be damaged when the actuators stand still, e.g. in that a pull is applied to it, it gets jammed during transport, is run over, etc.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Invalid Beds And Related Equipment (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003273773A AU2003273773A1 (en) | 2002-10-20 | 2003-10-20 | An electrical drive system |
EP03757730A EP1553907A1 (en) | 2002-10-20 | 2003-10-20 | An electrical drive system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA200201596 | 2002-10-20 | ||
DKPA200201596 | 2002-10-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004034945A1 true WO2004034945A1 (en) | 2004-04-29 |
Family
ID=32103850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK2003/000710 WO2004034945A1 (en) | 2002-10-20 | 2003-10-20 | An electrical drive system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1553907A1 (en) |
AU (1) | AU2003273773A1 (en) |
WO (1) | WO2004034945A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3716876A (en) * | 1971-05-20 | 1973-02-20 | Sybron Corp | Actuation means for an adjustable bed |
DE3813883A1 (en) * | 1988-04-25 | 1989-11-09 | Lancier Masch Peter | Measuring circuit for monitoring insulation resistances |
US6008598A (en) * | 1998-04-22 | 1999-12-28 | Patmark Company, Inc. | Hand-held controller for bed and mattress assembly |
WO2000070796A1 (en) * | 1999-05-17 | 2000-11-23 | U.S. Electronics Components Corp. | Remote control incorporating self test capability |
-
2003
- 2003-10-20 EP EP03757730A patent/EP1553907A1/en not_active Withdrawn
- 2003-10-20 AU AU2003273773A patent/AU2003273773A1/en not_active Abandoned
- 2003-10-20 WO PCT/DK2003/000710 patent/WO2004034945A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3716876A (en) * | 1971-05-20 | 1973-02-20 | Sybron Corp | Actuation means for an adjustable bed |
DE3813883A1 (en) * | 1988-04-25 | 1989-11-09 | Lancier Masch Peter | Measuring circuit for monitoring insulation resistances |
US6008598A (en) * | 1998-04-22 | 1999-12-28 | Patmark Company, Inc. | Hand-held controller for bed and mattress assembly |
WO2000070796A1 (en) * | 1999-05-17 | 2000-11-23 | U.S. Electronics Components Corp. | Remote control incorporating self test capability |
Also Published As
Publication number | Publication date |
---|---|
EP1553907A1 (en) | 2005-07-20 |
AU2003273773A1 (en) | 2004-05-04 |
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