WO2002011585A1 - Commande de securite capacitive constituee par une bande et par une piece de mobilier entrainee par un moteur - Google Patents

Commande de securite capacitive constituee par une bande et par une piece de mobilier entrainee par un moteur Download PDF

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Publication number
WO2002011585A1
WO2002011585A1 PCT/GB2001/003469 GB0103469W WO0211585A1 WO 2002011585 A1 WO2002011585 A1 WO 2002011585A1 GB 0103469 W GB0103469 W GB 0103469W WO 0211585 A1 WO0211585 A1 WO 0211585A1
Authority
WO
WIPO (PCT)
Prior art keywords
electronic
control system
capacitance
safety control
control means
Prior art date
Application number
PCT/GB2001/003469
Other languages
English (en)
Inventor
John Christopher Rees
Original Assignee
Smarta Systems Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GBGB0018914.2A external-priority patent/GB0018914D0/en
Application filed by Smarta Systems Limited filed Critical Smarta Systems Limited
Priority to AU2001275748A priority Critical patent/AU2001275748A1/en
Priority to EP20010953260 priority patent/EP1309259A1/fr
Publication of WO2002011585A1 publication Critical patent/WO2002011585A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C17/00—Sofas; Couches; Beds
    • A47C17/86—Parts or details for beds, sofas or couches only not fully covered in a single one of the sub-groups A47C17/02, A47C17/04, A47C17/38, A47C17/52, A47C17/64, or A47C17/84; Drawers in or under beds
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/62—Accessories for chairs
    • A47C7/72—Adaptations for incorporating lamps, radio sets, bars, telephones, ventilation, heating or cooling arrangements or the like
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C20/00—Head -, foot -, or like rests for beds, sofas or the like
    • A47C20/04—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C21/00—Attachments for beds, e.g. sheet holders, bed-cover holders; Ventilating, cooling or heating means in connection with bedsteads or mattresses
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47D—FURNITURE SPECIALLY ADAPTED FOR CHILDREN
    • A47D15/00—Accessories for children's furniture, e.g. safety belts

Definitions

  • CAPACmVE SAFETY CONTROL (STRIP, MOTOR DRIVEN FURNITURE)
  • the present invention relates to an electronic safety control system and, more particularly to a safety control system for preventing an object from becoming trapped between the approaching surfaces of two opposed parts of a mechanism in motion.
  • a similar arrangement instead uses a hollow compressible strip, which is connected to a pneumatic sensor for detecting the resulting increase in internal pressure when the strip is compressed.
  • both of the above arrangements require physical contact between at least one of the opposed edges and an obstruction therebetween, and thus do not fully obviate the risk of damage to the object causing the obstruction.
  • each of the known strips in providing a satisfactory output is known to be dependent upon the radius of curvature of the edge that the strip is to follow, there being, in each case, a limit to the extent to which the strip may be bent.
  • an electronic safety control system comprising an elongate, flexible electrically-conductive sensing element and electronic control means responsive to a change in capacitance arising from the close proximity to the element of an object to provide an output signal for controlling a powered device.
  • the sensing element may be fitted to one or other or both of the approaching surfaces to prevent an object from becoming trapped therebetween.
  • the electronic control means comprise capacitance sensing means in. the form of a charge transfer sensor, for example the QT 110 sensor produced by Quantum Research Group Limited, wherein a fixed charge is transferred from the sensing element to a sampling capacitor of known capacitance.
  • the capacitance of the sensing element which is affected by the proximity of the object, may then be calculated by measuring the voltage (or, in a burst-mode sensor, the accumulated voltage) across the sampling capacitor, as it is known that -
  • Cx is the unknown capacitance of the sensing element
  • Cs is the known capacitance of the sampling capacitor
  • Vs is the fixed voltage to which the sensing element is charged
  • Vr is the measured voltage transferred to the sampling capacitor
  • the sensing element comprises at least one wire.
  • the sensing element comprises a pair of parallel, spaced-apart wires, incorporated into an elongate flexible strip.
  • the strip is preferably sufficiently flexible to allow it be folded substantially flat, to form one or more angled bends in the strip.
  • the system comprises at least one fixing device into which the strip may be fitted.
  • the fixing device comprises a second elongate strip having a suitably profiled channel for receiving the sensing strip and into which the sensing strip may be clipped or pressed to form an interference fit.
  • the sensing element comprises a pair of parallel, spaced-apart wires
  • one of the two wires is preferably held at a substantially constant reference potential, and is most preferably grounded, with such an arrangement having been found to substantially increase the consistency of capacitance measurements made by the sensing means over a period of time and/or between different operating environments and the uniformity of sensitivity of the sensing element along its length.
  • the sensing element comprises a pair of wires
  • the distal ends of the two wires are preferably connected across a capacitor, such that the sensing element has a substantial residual capacitance.
  • any discontinuity in the sensing element due, for example, to a break or short in the element, will result in a substantial decrease in the capacitance of the cable, which may be detected by the electronic control means, for example to generate an alarm.
  • the electronic control means may be arranged to respond when the capacitance exceeds a pre-determined threshold value or when the capacitance deviates by more than a pre-determined amount from a residual value.
  • the sensitivity of the electronic control means to changes in capacitance is preferably adjustable, either manually or automatically.
  • At least the electronic control means are mains powered and are provided with an auxiliary power supply, preferably in the form of one or more re-chargeable batteries, to protect against a failure of the mains supply.
  • an auxiliary power supply preferably in the form of one or more re-chargeable batteries
  • the electronic control means are arranged to emit an audible or visual signal warning signal whilst the powered device is operating.
  • a closure arrangement comprising at least one displaceable closure member, a powered device for operating the closure member, and an electronic safety control system
  • the electronic safety system comprising an elongate, electrically- conductive element extending along at least part of the leading surface of the closure member or of a surface opposed to said leading surface and electronic control means responsive to a change in capacitance arising from the close proximity to the element of an object to provide an output signal for controlling the powered device.
  • the electronic control means are arranged to control the powered device to arrest an advancing movement of the closure member and/or to reverse the direction of movement of the closure member, in response to the change in capacitance.
  • the arrangement comprises means for sensing the position of the closure member to vary the level of responsiveness of the electronic safety control means to changes in capacitance.
  • the electronic safety control means may be arranged to become less responsive when the closure means are approaching full deployment, when there is no longer any danger of entrapment, to prevent any change in capacitance that might subsequently arise (for example due to the proximity of the surface against which the leading edge of the closure member is to abut) from preventing the closure member from being fully deployed.
  • the closure arrangement comprises an arrangement for closing the gap between two opposed parts of a chair assembly, to adjust the position, e.g. the height or inclination, of the chair, the powered device being an actuator, such as an electric, hydraulic or pneumatic actuator, for effecting said closure.
  • the powered device being an actuator, such as an electric, hydraulic or pneumatic actuator, for effecting said closure.
  • an electronic safety control system comprising a sensing element, in the form of an elongate flexible strip incorporating at least two parallel, spaced-apart wires, and electronic control means responsive to a change in capacitance arising from the close proximity to the strip of an object, wherein the strip is bent and/or folded to follow a path across the surface of a substrate.
  • the electronic control means are arranged to respond when the capacitance deviates by more than a predetermined amount from a residual value, the residual capacitance value being measured when the strip is fitted to the substrate and preferably when the substrate is located in its normal operating environment.
  • Figure 1 is a first perspective view of a re- configurable chair in an inclined configuration, the chair incorporating an electronic safety control system in accordance with the present invention
  • Figure 2 is an enlarged view of the portion of the chair shown at A in Figure 1;
  • Figure 3 is a second perspective view of the chair of Figure 1 ;
  • Figure 4 is an enlarged view of the portion of the chair shown at B in Figure 3;
  • Figure 5 is a perspective, cut-away view of an re- configurable bed, the chair incorporating an electronic safety control system in accordance with the present invention
  • Figure 6 is a perspective view of a sink unit, of adjustable height and incorporating an electronic safety control system in accordance with the present invention
  • Figure 7 is a perspective view of the underside of the sink unit of Figure 6;
  • Figure 8 is an enlarged view of the portion of the sink unit shown at C in Figure 6;
  • Figure 9 is a perspective view of a sink unit, of adjustable height and incorporating an electronic safety control system in accordance with the present invention.
  • Figure 10 is a perspective view of the underside of the sink unit of Figure 9; and Figure 11 is an enlarged view of the portion of the sink unit shown at D in Figure 10.
  • a re-configurable chair 2 comprising a back 4 and squab 6 mounted to an articulated support frame 8, an upper portion 10 of the frame being arranged to pivot forwards, away from a lower portion 12 of the frame, as shown in Figure 2, to assist in unseating a person from the chair.
  • the degree of inclination of the chair 2 is controlled by an electric motor (not shown) , which is remotely operable via a handset 14.
  • respective capacitive sensing elements 18,20 extend along the opposed edges of the upper and lower frame portions 10,12, the sensing elements 18,20 being connected to electronic control means (not shown) , which are tuned to respond to an increase in capacitance arising from the close proximity to either of the elements 18,20 of an obstruction, such as a person's hand, to prevent the gap between the two frame portions 10,12 from closing as the chair 2 is lowered.
  • a cushioned panel 24 is also attached to the front of the chair 2 and is arranged to pivot upwards about its upper edge (as shown) to provide a footrest, a third sensing element 26 being fitted to the front of the chair 2 to prevent the panel 24 from lowering if an obstruction is present between the panel 24 and the front of the chair 2.
  • Each of the sensing elements 18,20 and 26 comprises a flexible strip incorporating a pair of parallel, spaced-apart wires, e.g. 28,30, one wire being permanently grounded, so that a fixed potential applied periodically across the two wires may be used to determine the capacitance of the sensing element (which will vary according to the proximity of to the element of an obstruction) .
  • the strips 18,20 and 26 may be folded (for example as shown in Figure 4) to form bends at appropriate points along their lengths .
  • a single drive motor e.g. a linear actuator
  • a single drive motor is used both to adjust the degree of inclination of the chair and of the panel 24, such that the with the squab of the chair fully lowered, continued operation of the drive motor will raise the panel 24 to provide a footrest.
  • continued operation of the drive motor will then tip the squab of the chair in a forwards direction.
  • the electronic control means may be arranged to selectively respond to a change in capacitance associated with one or more of the sensing strips 18,20 and 26 according to the phase of operation of the chair, to arrest or reverse the direction of the motion of the drive motor.
  • control means may be responsive to a change in capacitance associated with strips 18 and 20 only whilst the chair is at least partly inclined, and to a change in capacitance associated with the strip 26 only whilst the panel 24 is at least partly extended.
  • the sensitivity of the control means to changes in sensed capacitance and the respective angles though which the seat and panel must be displaced away from their normal positions before the control means will actively respond to a change in capacitance are set to ensure that the increase in sensed capacitance as the gap closes between the panel and the front of the chair or between the parts 10 and 12 of the support frame 8, will not prevent the full closure of those gaps, but also such that the control means will only become unresponsive to a change in capacitance associated with a particular strip, when the gap adjacent that strip is sufficiently small that there is no longer any risk of entrapment (the phase of operation/prevailing configuration of the chair being determined, for example, from the outputs position sensors fitted to the moving parts of the chair) .
  • the three strips 18,20 and 26 may comprise portions of the same sensing strip, in which case, the control means may be arranged to respond to increases in capacitance above different thresholds according to the phase of operation of the chair, and preferably only in certain configurations of the chair, for example whilst none of the gaps adjacent the strip is less than a predetermined size (the phase of operation/prevailing configuration of the chair being determined, for example, from the outputs of position sensors fitted to the moving parts of the chair) .
  • the above-described chair arrangements will thus prevent an object, such as a person's hand, from becoming trapped between the two converging parts 10,12 of the support frame 8 as the chair 2 is lowered, or between the cushioned panel 24 and the front of the chair.
  • a safety control system in accordance with the present invention may also be incorporated into various other motorised mechanisms, such as the furniture arrangements that will be described hereinbelow with reference to Figures 5 to 11.
  • a re-configurable bed 32 comprising a base-frame 34 and a mattress 36 supported by a plurality of portions 38 whose height and orientation may be independently adjusted by respective drive motors (not shown) .
  • the bed is fitted with an electronic safety control system, the proximity sensing strip 40 of which extends around the upper perimeter of the frame 34.
  • a sink unit 42 is shown whose height may be adjusted by a drive motor 44, the proximity sensing strip 46 of an electronic control system being fitted around the underside of the sink unit 42 to prevent the unit from colliding with an obstruction, such as the legs of a person seated at the sink, as the drive motor 44 closes the gap between the sink unit 42 and the ground.
  • a table 48 is shown whose height may be adjusted by a drive motor incorporated into the trunk 50 of the table, the proximity sensing strip 52 of an electronic control system extending around the underside of the table-top 52 to prevent the top from lowering against an obstruction, such as the legs of a person seated at the table, as the drive motor closes the gap between the table-top 52 and the ground.

Abstract

Système de commande électronique de sécurité comprenant un élément de détection allongé souple et conducteur d'électricité (18, 20), ainsi que des moyens de commande électroniques. Ces moyens de commande électroniques réagissent à une modification de capacité d'un objet, apparaissant à proximité étroite de l'élément de détection (18, 20), ce qui déclenche un signal de sortie produit par lesdits moyens et servant à commander un dispositif électrique (14). De ce fait, on peut fixer cet élément de détection (18, 20) à l'une ou l'autre des surfaces des deux parties (10, 12) se rapprochant l'une de l'autre, ou à ces deux surfaces, au niveau des emplacements où on utilise ce dispositif électrique (14) afin de déplacer une partie (10) d'un mécanisme (8) vers une autre partie (12), ce qui empêche qu'un objet soit piégé entre les deux parties.
PCT/GB2001/003469 2000-08-03 2001-08-02 Commande de securite capacitive constituee par une bande et par une piece de mobilier entrainee par un moteur WO2002011585A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001275748A AU2001275748A1 (en) 2000-08-03 2001-08-02 Capacitive safety control (strip, motor driven furniture)
EP20010953260 EP1309259A1 (fr) 2000-08-03 2001-08-02 Commande de securite capacitive constituee par une bande et par une piece de mobilier entrainee par un moteur

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB0018914.2A GB0018914D0 (en) 2000-08-03 2000-08-03 Electronic safety control
GB0018914.2 2000-08-03
GB0113168A GB2368176A (en) 2000-08-03 2001-05-30 Proximity sensor employing a flexible capacitive sensing element
GB0113168.9 2001-05-30

Publications (1)

Publication Number Publication Date
WO2002011585A1 true WO2002011585A1 (fr) 2002-02-14

Family

ID=26244780

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/003469 WO2002011585A1 (fr) 2000-08-03 2001-08-02 Commande de securite capacitive constituee par une bande et par une piece de mobilier entrainee par un moteur

Country Status (3)

Country Link
EP (1) EP1309259A1 (fr)
AU (1) AU2001275748A1 (fr)
WO (1) WO2002011585A1 (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1275328A1 (fr) * 2001-07-10 2003-01-15 Hollandia The Sleep Engineering Center - Investments (1992) Ltd Mécanisme de contrôle pour meuble à position réglable
GB2383946A (en) * 2001-11-22 2003-07-16 Smartasystems Ltd Reconfigurable chair with proximity sensors or switches to control reconfiguration of the chair
EP1428459A1 (fr) 2002-12-12 2004-06-16 Stjernfjädrar AB Sommier réglable
WO2005030008A1 (fr) * 2003-09-25 2005-04-07 Eleksen Limited Appareil a detecteur a nappes textiles
DE202010005412U1 (de) * 2010-05-08 2011-08-11 Dewert Antriebs- Und Systemtechnik Gmbh Schalteinrichtung mit kapazitivem Sensor für elektrische Komponenten in einem Möbel
DE102011000578A1 (de) * 2011-02-09 2012-08-09 Paul Hettich Gmbh & Co. Kg Bedienanordnung zum Ansteuern eines Möbelantriebs
WO2014116863A1 (fr) * 2013-01-24 2014-07-31 L & P Property Management Company Détection par fil capacitif pour mobilier
US9089223B2 (en) 2012-01-09 2015-07-28 L&P Property Management Company Occupancy detection for furniture
US9337831B2 (en) 2012-01-09 2016-05-10 L&P Property Management Company Capacitive wire sensing for furniture
US9482707B2 (en) 2012-01-09 2016-11-01 L&P Property Management Company Occupancy detection for automated recliner furniture
US9528812B2 (en) 2012-01-09 2016-12-27 L&P Property Management Company Capacitive wire sensing for furniture
WO2018065142A1 (fr) * 2016-10-05 2018-04-12 Logicdata Electronic & Software Entwicklungs Gmbh Système de détection de présence pour un ensemble meuble réglable électriquement et procédé de détection de présence avec un ensemble meuble réglable électriquement
US10048662B2 (en) 2012-01-09 2018-08-14 L&P Property Management Company Characterization and calibration for automated furniture
US10197609B2 (en) 2012-01-09 2019-02-05 L&P Property Management Company Capacitive sensing for automated furniture
US10197259B2 (en) 2012-01-09 2019-02-05 L&P Property Management Company Standalone capacitance sensor for furniture
US10334960B2 (en) 2012-01-09 2019-07-02 L&P Property Management Company Drop-in occupancy detection component for furniture
US10555615B2 (en) 2012-01-09 2020-02-11 L&P Property Management Company Calibration of detection features for automated furniture

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4453112A (en) * 1981-03-25 1984-06-05 Saint-Gobain Vitrage Electronic safety device for controlling the drive motor attached to a sliding window
GB2343371A (en) * 1998-11-03 2000-05-10 Ulland Islwyn Watkins Safety control of powered furniture
WO2000044018A1 (fr) * 1999-01-26 2000-07-27 Harald Philipp Capteur capacitif et montage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4453112A (en) * 1981-03-25 1984-06-05 Saint-Gobain Vitrage Electronic safety device for controlling the drive motor attached to a sliding window
GB2343371A (en) * 1998-11-03 2000-05-10 Ulland Islwyn Watkins Safety control of powered furniture
WO2000044018A1 (fr) * 1999-01-26 2000-07-27 Harald Philipp Capteur capacitif et montage

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1275328A1 (fr) * 2001-07-10 2003-01-15 Hollandia The Sleep Engineering Center - Investments (1992) Ltd Mécanisme de contrôle pour meuble à position réglable
GB2383946A (en) * 2001-11-22 2003-07-16 Smartasystems Ltd Reconfigurable chair with proximity sensors or switches to control reconfiguration of the chair
GB2383946B (en) * 2001-11-22 2005-07-20 Smartasystems Ltd A powered adjustable chair having an occupant sensing system.
US6981745B2 (en) 2001-11-22 2006-01-03 John Christopher Rees Reconfigurable chair
EP1428459A1 (fr) 2002-12-12 2004-06-16 Stjernfjädrar AB Sommier réglable
WO2005030008A1 (fr) * 2003-09-25 2005-04-07 Eleksen Limited Appareil a detecteur a nappes textiles
DE202010005412U1 (de) * 2010-05-08 2011-08-11 Dewert Antriebs- Und Systemtechnik Gmbh Schalteinrichtung mit kapazitivem Sensor für elektrische Komponenten in einem Möbel
DE102011000578A1 (de) * 2011-02-09 2012-08-09 Paul Hettich Gmbh & Co. Kg Bedienanordnung zum Ansteuern eines Möbelantriebs
US9337831B2 (en) 2012-01-09 2016-05-10 L&P Property Management Company Capacitive wire sensing for furniture
US10048662B2 (en) 2012-01-09 2018-08-14 L&P Property Management Company Characterization and calibration for automated furniture
US10555615B2 (en) 2012-01-09 2020-02-11 L&P Property Management Company Calibration of detection features for automated furniture
US9482707B2 (en) 2012-01-09 2016-11-01 L&P Property Management Company Occupancy detection for automated recliner furniture
US9488746B2 (en) 2012-01-09 2016-11-08 L&P Property Management Company Capacitive sensing for automated recliner furniture
US9528812B2 (en) 2012-01-09 2016-12-27 L&P Property Management Company Capacitive wire sensing for furniture
US10393691B2 (en) 2012-01-09 2019-08-27 L&P Property Management Company Capacitive sensing for furniture
US9089223B2 (en) 2012-01-09 2015-07-28 L&P Property Management Company Occupancy detection for furniture
US10197609B2 (en) 2012-01-09 2019-02-05 L&P Property Management Company Capacitive sensing for automated furniture
US10197259B2 (en) 2012-01-09 2019-02-05 L&P Property Management Company Standalone capacitance sensor for furniture
US10334960B2 (en) 2012-01-09 2019-07-02 L&P Property Management Company Drop-in occupancy detection component for furniture
WO2014116863A1 (fr) * 2013-01-24 2014-07-31 L & P Property Management Company Détection par fil capacitif pour mobilier
WO2018065142A1 (fr) * 2016-10-05 2018-04-12 Logicdata Electronic & Software Entwicklungs Gmbh Système de détection de présence pour un ensemble meuble réglable électriquement et procédé de détection de présence avec un ensemble meuble réglable électriquement
US11045008B2 (en) 2016-10-05 2021-06-29 LOGICDATA Electronics & Software Entwicklungs GmbH Presence detection system for an electrically adjustable furniture assembly and method of presence detection with an electrically adjustable furniture assembly

Also Published As

Publication number Publication date
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