EP0518147B1 - Dispositif de verrouillage de porte pour machines à laver et/ou sécher le linge - Google Patents

Dispositif de verrouillage de porte pour machines à laver et/ou sécher le linge Download PDF

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Publication number
EP0518147B1
EP0518147B1 EP92109161A EP92109161A EP0518147B1 EP 0518147 B1 EP0518147 B1 EP 0518147B1 EP 92109161 A EP92109161 A EP 92109161A EP 92109161 A EP92109161 A EP 92109161A EP 0518147 B1 EP0518147 B1 EP 0518147B1
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EP
European Patent Office
Prior art keywords
door
opened
interlock device
machine
microprocessor
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.)
Expired - Lifetime
Application number
EP92109161A
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German (de)
English (en)
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EP0518147A1 (fr
Inventor
Giuseppe Frucco
Fernando Russo
Antonio Filoso
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Zanussi Elettrodomestici SpA
Original Assignee
Zanussi Elettrodomestici SpA
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Publication date
Application filed by Zanussi Elettrodomestici SpA filed Critical Zanussi Elettrodomestici SpA
Publication of EP0518147A1 publication Critical patent/EP0518147A1/fr
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Publication of EP0518147B1 publication Critical patent/EP0518147B1/fr
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Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
    • E05B47/0009—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with thermo-electric actuators, e.g. heated bimetals
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door

Definitions

  • the present invention relates to a door interlock device for clothes washing and/or drying machines and the like, which is adapted to enable the locked door of said machines to be opened at the end or during each selected washing and/or drying cycle upon reaching a certain safety level of operating conditions inside the machines themselves.
  • Clothes washing and/or drying machines of the current type are provided with a door interlock device which is adapted to keep the loading door of said machines locked in its shut position throughout the duration of each selected washing and/or drying cycle, thereby preventing said loading door of the machines from being accidentally opened as long as operating conditions prevail inside the machine which may prove dangerous or risky for the user, said dangerous conditions being for instance brought about by a high temperature of the wash liquor, the drum rotating at high speed rates or, in the case of drying machines, a high temperature of the air blown into the drum for drying the clothes.
  • door interlock devices for washing and drying machines
  • an electromechanical actuator such as a bimetallic element
  • an interlock relay or similar element associated with the timer-programme sequence control switch of each machine and provided with a peg interacting with the door latch, said actuator being capable of being triggered into two different positions of operation by said timer-programme sequence control switch, ie.
  • These door interlock devices further comprise a traditional type of delay element associated with the electromechanical actuator and appropriately set or rated so as to allow said electromechanical actuator to be only actuated after a pre-determined delay time has elapsed from the end of the last spin-extraction or drying phase of the selected washing and/or drying cycle, in such a way as to enable the loading door of the machines to be only openend when the drum has safely stopped rotating and, as a result, any dangerous or risky situation that is likely to be of some harm to the user coming in contact with the drum is eliminated.
  • a door interlock device of the afore mentioned type which comprises a plurality of electronic comparators adapted to compare the actual measured value with a pre-determined reference value of such process parameters as the rotating speed, or rpm, of the drum, the temperature and the filling level of the water in the wash tub of washing machines (or the temperature of the drying air in the case of clothes washing machines), and connected with the door latch through a NOR logic gate, as well as with actuator means of the electromechanical type, so as to either prevent the loading door of the respective machine from being opened or enable it to be opened, through the actuation of a push-button that is mechanically connected with said door latch through a linkage system, strings, tie rods or the like, based on the outcome of each comparison made between the actual measured values and the pre-determined reference values of all afore cited process parameters, so that access
  • FIG. 1 is therefore views illustrating schematically the door interlock device according to the present invention, as applicable to clothes washing and/or drying machines, which is adapted to keep the loading door (not shown) of said machines locked in its shut position, barring the access to the rotating drum (not shown, either), in such a way as to prevent any undesirable opening of said loading door from occurring when the machine is going through any selected washing and/or drying cycle, so as to safely protect the user from any injury either upon entering into contact with those internal parts of said machines which are subject to high temperatures owing to the high temperature of the wash liquor or the drying air, as the case may be, or upon entering into contact with the drum rotating at a high speed rate.
  • the above cited door interlock device substantially comprises an electromechanical actuator 4 of a traditional type, which is associated with the peg (not shown) interacting with the latch (not shown) of the door of each machine so as to keep or not to keep said door locked in its shut position, and further comprises an electric push-button 5 for enabling the operation of the actuator 4 according to criteria as described in the following, said push-button being connected with the ground 6 of the device and arranged to be closed for connection to a pre-determined reference potential V cc that is applied through a conductor 7 to the electronic microprocessor 8 of the machine, which is provided in the same machine so as to control the carrying out of the different washing and/or drying cycles thereof.
  • V cc pre-determined reference potential
  • said electromechanical actuator 4 is formed by a heater element of the PTC type in association with a bimetallic or similar element acting as a delay element for the opening of the door, as schematically illustrated to represent a single unit 9 which is supplied through a conductor 10 connected to the main phase conductor 11 of the machine, said unit being adapted to operate said peg into its two operational door locking and releasing positions, along with a movable electric contact 12 supplied through said main phase conductor 11 and connected with the different operational components of the machine which are included in the electric circuitry thereof and which, in this example, comprise the synchronous motor 13 of an appropriate rotary selector (not shown) that will be described in the following, the liquid-detergent dispensing pump 14 provided for extracting the liquid detergent contained in an appropriate reservoir (not shown) in the machine and delivering it into the wash tub, the recirculating pump 15 which is connected with the recirculation conduit (not shown) of washing machines arranged to perform the washing process by spraying the wash liquor onto the clothes in the drum, the drain pump 16, and the water
  • the above mentioned operational components of the machine are capable of being selectively energized through a plurality of micro-switches which, in the example described here, are constituted by the micro-switches 19, 20, 21 and 22, which are provided in a particularly advantageous way as component parts of a printed-circuit board included on an electronic module 23 and perform further a function of identifying, in the way that will be decribed in the following, the various operating positions taken each time by said synchronous motor 13 and corresponding to the various phases of the washing and/or drying cycle being performed by the machine as selected by its user.
  • said synchronous motor 13 is supplied by means of an electric conductor 24, which is inserted between said phase conductor 11 and the neutral conductor 25 of this electric circuit, through at least a traditional-type semiconductor switch such as a Triac 26 or similar bi-directionally conducting device driven through a driver 27 which is connected to the microprocessor 8 through the conductor 28, whereas all said micro-switches 19-22 are capable of being supplied in the manner as described hereinafter, between the two conductors 11 and 25, through at least a further semiconductor switching element such as a Triac 29 or similar bi-directionally conducting device connected between an electric conductor 30, which is common to all said micro-switches, and the neutral conductor 25, said Triac being driven through a driver 31 that is connected, through the conductor 32, with the output 33 of a NOR logic gate 34 comprised in the microprocessor 8, along with a series of further electronic components including three electronic comparators 35, 36 and 37 which have their respective outputs 38, 39 and 40 connected with the corresponding inputs 41, 42 and 43 of said
  • the respective firts inputs 44, 45 and 46 of said electronic comparators 35, 36 and 37 are in turn connected, through corresponding measurement transducers 47, 48 and 49, with sensors (not shown) being installed inside the machine and provided to respectively detect the temperature of the wash liquor (or the drying air, as the case may be), the level of the wash liquor filled into the tub as well as the rotation speed of said rotating drum, whereas the respective second inputs 50, 51 and 52 of said electronic comparators 35, 36 and 37 are connected with predetermined electric reference voltages.
  • the above described electronic components provide a safety arrangement as described in the Italian patent application no. 45711-A/89 filed on February 21, 1989 by Industrie Zanussi S.p.A., to which reference will therefore be made for a better understanding of the operational implications and peculiarities, said safety arrangement being adapted to prevent the loading door of the machine from being openend as long as the temperature of the wash liquor (or the drying air, as the case may be), the level of said wash liquor and the rotation speed of the rotating drum are at such values as to prove dangerous or risky for the user in the case that he or she would be capable of gaining access and getting into contact with the drum inside the machine.
  • said conductor 30 is further connected with the microprocessor 8 so as to enable said microprocessor to detect the related braking or making conditions of the various micro-switches 19-22 to the purposes that will be described hereinafter.
  • the micro-switch 19 is adapted to be closed for establishing a connection with the electromechanical actuator 4 through said conductors 10 and 30,
  • the micro-switch 20 is adapted to be closed for establishing a connection with the liquid-detergent dispensing pump 14 through the conductors 24, 53 and 30,
  • the micro-switch 21 is adapted to be closed for establishing a connection with the recirculating pump 15 through the conductors 24, 54 and 30
  • the micro-switch 22 is adapted to be closed for establishing a connection with both the drain pump 16, through the conductors 55, 56 and 30, and the break-before-make contact 57 of a relay switch 58 that is controllable through the microprocessor 8 of the machine.
  • the electromagnetic valves 17 and 18 are in turn selectively energizable by the same micro-switch 22 through a further relay switch 59 which is controllable through said microprocessor 8 of the machine and is provided with a break-before-make contact 60 adapted to be switched over to and from either one of the respective conductors 61 and 62 so as to establish a connection with and enable the energization of said electromagnetic valves 17 and 18, said contact being supplied through a further conductor 63 which is caused to communicate with the conductor 56 of the micro-switch 22 when said break-before-make contact 57 of said relay switch 58 is switched over to its other operational setting.
  • micro-switches 19-22 are in a particularly advantageous manner operated by a control device which is associated with the detergent dispensing arrangement of a type as traditionally used in washing machines, said device being substantially similar to the one described in the Italian patent application PN91A000012 filed on February 27, 1991 by the same Applicant (see also EP-A-0 504 545), and being such as to enable the breaking and/or making conditions of each micro-switch to be identified, along with the corresponding pre-determined operational phases of the washing cycle being each time performed by the machine according to user's selection, under utilization of a rotary selector means adapted to selectively let supply water into each compartments of said detergent dispenser and capable of being rotatably driven by a related synchronous motor in the way as described in the afore cited patent application.
  • said rotary selector means 64 comprises, in a similar way as described for the selector means covered by the afore mentioned patent application, a plurality of concentrically running, electrically conductive strips which in this example of embodiment comprise the four circularly-shaped conductive strips 65, 66, 67 and 68, which are arranged on an insulating support board 69 so as to be separate from one another in a mutually independent way, and which are provided with respective angularly spaced fixed contacts 70, 71, 72 and 73 and are further connected with corresponding terminals 74, 75, 76 and 77 of a terminal block 78 that is associated with said rotary selector means 64, said terminals being respectively connected with the corresponding micro-switches 19, 20, 21 and 22, and said rotary selector means further comprising a wiping contact 79 that is in turn connected with a corresponding conductive strip 80 which is internally concentric with respect to the other conductive strips and which is supplied by the electric circuit of the machine, said wiping
  • Said synchronous motor (not shown in the Figure) is in turn supplied through electrical conductors 81 and 82 that are connected to corresponding terminals 83 and 84 on the terminal block 78.
  • Figure 3 shows a schematic view of the mechanical mechanism 85 which is built in the washing machine and is provided in view of causing the operation of the latch 86 of the door of said machine.
  • the above cited mechanism in a much usual way comprises a metal pulling string 87 sliding through a protective sheathing 88, an end of which (as marked by the numeral 89 in the drawing) is operable by the contour of an appropriately provided cam 90, which is arranged coaxially with respect to said rotary selector means 64 and is rotatably actuatable by the same selector means, and the other end of which (as marked by the numeral 92 in the Figure) is adapted to engage with the end portion of a first arm 93 of an arcuate spring-loaded lever 94 pivoting about a fulcrum 95 located on the door lock 86 thereunder.
  • Said lever is further provided with a second arm 96, the rounded-off end portion 97 of which is adapted to interact with the latch 98 of said door lock, said latch being adapted to lock the door in its shut position or to release it therefrom so as it can be opened.
  • said metal pulling string 87 is capable of causing the lever 94 to be shifted, according to the position in which the string itself is shifted by the movement of said cam 90, into either one of two operational positions, ie. a first position as shown in Figure 3, in which said rounded-off end portion 97 of the arm 96 of said lever does not interfere with said latch 98, thereby allowing it to keep engaged with the boor and, as a consequence, locking said door in its shut position, and a second position in which said lever is caused to pivot about its fulcrum 95 in the direction shown by the arrow A, wherein said rounded-off end portion of said lever arm 96 is brought to act against said latch 98, thereby disengaging it from the door and, as a consequence, enabling the door to be opened.
  • two operational positions ie. a first position as shown in Figure 3, in which said rounded-off end portion 97 of the arm 96 of said lever does not interfere with said latch 98, thereby allowing it to keep engaged with the boor and
  • At least one energy-absorbing element is provided, such as for instance a spring 99 that may be appropriately arranged anywhere in the system, for example at the end portion 89 of said string.
  • the door interlock device provided in this way operates as follows: when the desired washing cycle has been selected and set on the machine and the door of the same machine has been properly shut after having loaded the dirty clothes in the drum, the electromechanical actuator 4 acts to drive the movable electrical contact 12 into making and the door is kept locked in this shut position by the latch 98 of the door lock 86, regardless of the position taken by the arcuate lever 94 being pulled by the string 87, as long as said electromechanical actuator 4 is energized.
  • the electrical circuit of the machine is energized following the closing of said movable contact 12, while triggering of the Triac 26 causes the synchronous motor 13 of the rotary selector means 64 of the machine to be energized so as to switch said rotary selector means into its setting corresponding to the starting phase of said washing cycle.
  • this causes the various functional components of the machine to be selectively energized and, as a consequence, the selected washing cycle starts being actually performed by the machine throughout its various phases.
  • said rotary selector means 64 is successively switched into its various control settings as driven by the action of the same synchronous motor 13 associated therewith and under the control of the microprocessor 8.
  • the corresponding condition is detected by the microprocessor 8, while the unit 9, which comprises the PTC heating element and the bimetallic element, is de-energized, thereby causing the latch 98 of the door lock 86 to be released, and consequently enabling the door to be opened, with a certain delay.
  • This operation can be performed automatically, without any need for the electrical push-button switch 5 to be actuated into its closed setting, in the case that the cam 90 is rotated in such a setting as to cause the string 87 to be pulled and, as a consequence, the latch 98 to be released. If this is not the case, said operation is performed automatically by actuating the push-button switch 5 into its closed setting, thereby making the circuit for the microprocessor 8 to be supplied with the reference voltage V cc , which therefore provides said microprocessor with the information that there is a demand for the door to be opened, so that the same microprocessor is switched into its door release control mode as described hereinafter.
  • said microprocessor 8 is effective in signalling, through its built-in safety system as previously described, whether the temperature of the wash liquor (or the drying air, as the case may be), the level of the wash liquor in the tub and the rotation speed of the drum have decreased to pre-determined safety values that would therefore not imply any dangerous or risky situation upon opening of the door or touching internal parts of the machine by the user.
  • the microprocessor 8 will by no means enable the door lock to be released, and the door to be opened, while signalling this condition through an appropriately provided visual or acoustic indicator (not shown) associated therewith.
  • the microprocessor 8 enables the door lock release procedure to be started, owing to the fact that it keeps the synchronous motor 13 continuously energized through the Triac 26.
  • the cam 90 is caused to be rotatably actuated so that the string 87 is pulled until the cam itself causes in this way the lever 94 to be shifted into ith other operational position, in which said lever 94 is pivoted about its fulcrum 95 in the direction shown by the arrow A and the arm 96 of the same lever is brought to act against the latch 98, thereby disengaging it from the door and enabling the same door to be opened.
  • the door interlock device provided according to the invention in the afore described way has a simple construction and enables the door to be opened automatically, even in the case that the door is not provided with a handle. Furthermore, owing to the fact that it does not require any mechanical action to operate the door, it is suitable for use even in clothes washing and/or drying machines equipped with electronic control circuits, thereby ensuring a very reliable operation of the same machines.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)

Claims (3)

  1. Dispositif de verrouillage de porte pour machines à laver et/ou sécher le linge comprenant une cuve de lavage contenant un tambour rotatif accessible par une porte de chargement, un distributeur de lessive pourvu d'un moyen de sélection rotatif pouvant être amené par rotation dans plusieurs positions de fonctionnement par au moins un moteur synchrone ou un moyen similaire, afin de provoquer le remplissage sélectif de l'eau provenant du réseau d'alimentation en eau dans chacun des différents compartiments dudit distributeur de lessive, ledit moyen de sélection rotatif étant adapté pour actionner plusieurs moyens de commutation afin de permettre aux différentes phases de chaque cycle de lavage sélectionné d'être identifiées, et comprenant également un moyen d'action électromécanique pourvu d'au moins un élément de retard d'un type connu en soi, pour permettre à la porte d'être ouverte après un retard prédéterminé qui suit la fin de chaque cycle de fonctionnement associé de la machine, plusieurs composants fonctionnels (tels que des pompes pour distribuer les lessives liquides, une pompe de recirculation de liquide de lavage, une pompe de vidange, des vannes électromagnétiques d'admission d'eau, etc.) inclus dans le circuit interne de la machine ainsi que ledit moteur synchrone, ledit moyen de commutation et au moins un moyen de microprocesseur électronique d'un type connu en soi prévus pour commander l'avancement des différents cycles de fonctionnement en connectant et en déconnectant en séquence lesdits composants fonctionnels, ladite machine comprenant en outre un verrou de porte agissant sur ladite porte de chargement de façon à l'empêcher d'être ouverte ou à lui permettre d'être ouverte, ledit circuit comprenant enfin des moyens de sécurité d'un type connu en soi, prévus dans ledit microprocesseur, et adaptés pour permettre à ladite porte d'être ouverte au moyen au moins d'un commutateur électrique à bouton-poussoir, afin de ne permettre audit verrou de porte d'être actionné par ledit moyen d'action électromécanique, que lorsque la température du liquide de lavage (ou de l'air sec, selon le cas), le niveau du liquide de lavage et la vitesse de rotation dudit tambour contenant les vêtements aient diminué jusqu'à des valeurs de sécurité prédéterminées, évitant toute situation dangereuse ou risquée pour l'utilisateur, ledit dispositif de verrouillage de porte étant caractérisé en ce que ledit commutateur électrique à bouton-poussoir (5) est connecté de façon fonctionnelle audit moyen de microprocesseur (8) pour permettre audit verrou de porte (86) d'être actionné, et en conséquence à ladite porte d'être ouverte, par les moyens d'action (90, 87, 94) qui sont associés audit verrou de porte (86) et qui peuvent être actionnés par ledit moyen de sélection rotatif (64), sous contrôle dudit moyen de microprocesseur (8).
  2. Dispositif de verrouillage de porte selon la revendication 1, caractérisé en ce que ledit moyen d'action comprend au moins une came appropriée (90) qui est coaxiale avec ledit moyen de sélection rotatif (64), et qui peut être actionnée en rotation par ce dernier, et comprend également un ressort métallique (87) ou un moyen similaire, et un levier incurvé à ressort (94) pouvant tourner autour d'un pivot situé sur ledit verrou de porte (86), ledit ressort (87) étant connecté à une extrémité (89) de celui-ci avec ladite came (90) et, à l'autre extrémité (92) de celui-ci avec un premier bras (93) dudit levier (94) dont le second bras (96) est aménagé pour coopérer avec le blocage (98) dudit verrou de porte (86), ledit levier (94) pouvant être décalé par le mouvement rotatif de ladite came (90) par l'intermédiaire dudit ressort (87), en interposant un moyen d'absorption d'énergie (99) afin d'actionner ledit blocage (98) dans sa position de déverrouillage de la porte.
  3. Dispositif de verrouillage de porte selon la revendication 2, caractérisé en ce que ledit moyen d'absorption d'énergie comporte au moins un ressort (99).
EP92109161A 1991-06-13 1992-05-30 Dispositif de verrouillage de porte pour machines à laver et/ou sécher le linge Expired - Lifetime EP0518147B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN910035A IT1250393B (it) 1991-06-13 1991-06-13 Dispositivo di bloccaggio della porta per macchine lavatrici o asciugatrici di biancheria.
ITPN910035 1991-06-13

Publications (2)

Publication Number Publication Date
EP0518147A1 EP0518147A1 (fr) 1992-12-16
EP0518147B1 true EP0518147B1 (fr) 1995-07-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92109161A Expired - Lifetime EP0518147B1 (fr) 1991-06-13 1992-05-30 Dispositif de verrouillage de porte pour machines à laver et/ou sécher le linge

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EP (1) EP0518147B1 (fr)
DE (1) DE69203656T2 (fr)
ES (1) ES2077294T3 (fr)
IT (1) IT1250393B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6036241A (en) * 1998-03-11 2000-03-14 Maytag Corporation Locking mechanism for an appliance door
ITTO980511A1 (it) * 1998-06-11 1999-12-13 Bitron Spa Dispositivo di bloccaggio di un portello di un apparecchio elettrodome stico.
AU2003266183A1 (en) * 2002-08-23 2004-03-19 Aweco Appliance Systems Gmbh And Co. Kg Household machine
ITTO20040534A1 (it) 2004-07-30 2004-10-30 Itw Ind Components Srl Dispositivo di incaglio per una porta di un elettrodomestico, in particolare una lavastoviglie
ITMC20070141A1 (it) * 2007-07-10 2009-01-11 Elmarc Societa Per Azioni Sistema e circuito elettronico di protezione del portello delle macchine lavatrici o lava-asciugatrici.
US10119312B2 (en) 2012-01-18 2018-11-06 Illinois Tool Works Inc. Lock device and apparatus mounted with the same
DE102012207836A1 (de) * 2012-05-10 2013-11-14 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät
CN109853195B (zh) * 2017-11-30 2023-01-20 青岛海尔洗衣机有限公司 一种具有紧急开门功能的洗衣机

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1997310U (de) * 1967-05-20 1968-11-28 Zanussi A Spa Industrie Mechanische sicherheitsriegel, insbesondere fuer waschmaschinen, geschirrspuelmaschinen u. dgl.
IT1234686B (it) * 1989-02-21 1992-05-26 Zanussi A Spa Industrie Dispositivo di bloccaggio dello sportello per macchine lavabiancheria o asciugabiancheria.

Also Published As

Publication number Publication date
ITPN910035A0 (it) 1991-06-13
IT1250393B (it) 1995-04-07
DE69203656D1 (de) 1995-08-31
ES2077294T3 (es) 1995-11-16
DE69203656T2 (de) 1996-04-04
EP0518147A1 (fr) 1992-12-16
ITPN910035A1 (it) 1992-12-14

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