EP1861535B1 - Dispositif de blocage pour la porte d'un appareil menager electrique, en particulier la porte d'une machine a laver - Google Patents

Dispositif de blocage pour la porte d'un appareil menager electrique, en particulier la porte d'une machine a laver Download PDF

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Publication number
EP1861535B1
EP1861535B1 EP06710509A EP06710509A EP1861535B1 EP 1861535 B1 EP1861535 B1 EP 1861535B1 EP 06710509 A EP06710509 A EP 06710509A EP 06710509 A EP06710509 A EP 06710509A EP 1861535 B1 EP1861535 B1 EP 1861535B1
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EP
European Patent Office
Prior art keywords
pawl
door
striking plate
resistive wire
flat spring
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
EP06710509A
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German (de)
English (en)
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EP1861535A1 (fr
Inventor
Tomislav Murovec
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.)
ITW Appliance Components doo
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ITW Appliance Components doo
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Application filed by ITW Appliance Components doo filed Critical ITW Appliance Components doo
Publication of EP1861535A1 publication Critical patent/EP1861535A1/fr
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Classifications

    • 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 concerns a blocking device for a door of an electric household appliance, in particular for the door of a front-loading washing machine.
  • the known devices as that shown in EP1137030A1 include a body that can be fixed to a frame of the electric household appliance, laterally to a door to be blocked, a striker in the form of a striking plate held sliding by the body perpendicular to the door and suited to cooperate in use with a notch of the door, a pawl for blocking the sliding of the striking plate, and control means for selectively moving the pawl between an extended position and a retracted position in/from a corresponding through perforation in the striking plate.
  • the control means are defined by a bimetallic spring situated close to a resistive pill having positive temperature coefficient (PTC) and coupled to a bistable elastic device; when the electrical appliance is operating, the supplied electric current heats the resistive pill which heats the bimetallic spring, making the bistable electric device snap into a position in which the pawl is brought into the extended position, in which it engages the perforation in the striking plate, blocking the transverse sliding of the latter and, consequently, preventing it from being released from the notch even if the user tries to force the door into open position.
  • PTC positive temperature coefficient
  • a first drawback of the known devices described consist of the high consumption of electric energy, even though it is limited by the fact that, as the resistive PTC pill heats, its electrical resistance decreases. Moreover, the devices of the type described are bulky and relatively complex, as they usually also need a mechanism that amplifies the movement of the bimetallic spring, to guarantee a sufficient travel of the pawl; then, in any case, the travel of the pawl remains limited. But, above all, the known devices present the drawback that the blocking device remains inserted for a certain time even after the end of the wash cycle and, therefore, the end of the passage of electric current, due to the cooling time necessary for the PTC pill. In fact, only when the resistive pill completely cooled down can the bimetallic spring snap back into starting position, bringing the pawl into retracted position outside the through perforation in the striking plate, so freeing the latter from the blocking action of the pawl.
  • a further object of the invention is also to realise a device of the above type which has many parts in common with the known devices based on a PTC pill, so as to achieve a further reduction in production costs by using design components that have already been amortized.
  • the present invention relates to a blocking device for a door of an electric household appliance, in particular for the door of a front-loading washing machine, as defined in claim 1.
  • the blocking device is distinguished by the fact that the above-mentioned means for controlling the pawl comprise an actuator including an electrically resistive wire made of a shape memory alloy in such a way as to be able to vary its own length as an effect of its variation in temperature; means for supplying electric power to said resistive wire, suited to determine its controlled variation in temperature by joule effect; and cam means activated by said actuator and acting on a bistable elastic device directly controlling the position of said pawl.
  • the above-mentioned means for controlling the pawl comprise an actuator including an electrically resistive wire made of a shape memory alloy in such a way as to be able to vary its own length as an effect of its variation in temperature; means for supplying electric power to said resistive wire, suited to determine its controlled variation in temperature by joule effect; and cam means activated by said actuator and acting on a bistable elastic device directly controlling the position of said pawl.
  • the means for supplying electric power to the resistive wire comprise means for intermediate bridging of the resistive wire suited to determine the controlled temperature variation only on, selectively, a first and a second half of the same.
  • the bistable elastic device that directly controls said pawl comprises a first flat spring and a second flat spring connected together at the respective free ends of the same, adjacent to each other, by a toggle-shaped coupling spring in particular in the shape of an upside-down U (with respect to the position of the pawl) and hinged on the side opposite said free ends of the first and second flat spring.
  • a blocking device having an extremely limited bulk and weight and having high reliability, which maintains the same elements that make up the known PCT pill devices, in particular the pawl control mechanism based on a bistable elastic device of the many known types, replacing only the PTC pill and respective bimetallic spring with a cam operated by a wire made of a shape memory alloy.
  • Minimum energy and heating consumption values are therefore obtained, as it is necessary to heat the resistive wire only long enough to cause its variation in length in the chosen sector, with consequent rotation of the cam means in a first predetermined direction; after that the supply of current may be completely suspended, as the consequent cooling of the previously heated length of wire does not bring about the release of the device; to cause the release of the pawl from the perforation in the striking plate, according to the invention, it will be necessary to heat another section of wire with a new supply of electric current, the resulting variation in the length of the wire will turn the cam means in the opposite direction to the previous one, returning the device to the original configuration.
  • the device of the invention uses a large number of components already used in the known devices based on the PTC pill, thus allowing the adaptation of existing designs and the use of existing components, with consequent great reductions in costs.
  • the reference number 1 indicates the whole of a blocking device in a closed position of a known and not illustrated door of an electric household appliance, also not illustrated for simplicity, for example a front-loading washing machine, which will be specifically referred to below without for this reason losing generality.
  • the device 1 comprises a body 6 which can be fixed in a known way to a frame of the electric household appliance, laterally to a door to be blocked, a striker in the form of a striking plate 8 ( figure 2 ) held sliding by the body 6 perpendicular to the axis of rotation of the door and suited to cooperate in use with a known notch 9 of the door, a pawl 10 for blocking the sliding of the striking plate 8, and control means, indicated overall with 11, for selectively moving the pawl 10 between an extended position towards the inside of a through perforation 13 in the striking plate 8 (indicated with hatching in figure 2 ), and a position retracted from the perforation 13.
  • the pawl 10 moves between said position extended from its seat in the body 6 and in which the pawl 10 engages the through perforation 13 in the striking plate 8, and said retracted position, in which it is inside its seat in the body 6 and, consequently, outside the perforation 13; in this retracted position, the striking plate 8 is consequently free to slide with relation to the body 6, transversely to the door, to disengage the notch 9, while in the extended position of the pawl 10 all sliding of the plate 8 is prevented by the engaging of the pawl 10 in the perforation 13.
  • the body 6 is made of an electrically non conductive material, for example a synthetic plastic, and houses inside it the control means 11 and all the other main components of the device 1.
  • control means 11 comprise an actuator 20, comprising in turn, as actuating element, an electrically conductive resistive wire 21, made of a shape memory alloy (for example belonging to the family commercially known as DYNALLOY®), in such a way as to be able to vary its own length as an effect of its variation in temperature; the control means 11 also comprise means 22 for supplying electric power to the resistive wire 21, suited to determine its controlled variation in temperature by joule effect.
  • a shape memory alloy for example belonging to the family commercially known as DYNALLOY®
  • the electric power supply means 22 consist of a pair of contacts 23, 24 to which the opposite ends of the resistive wire 21 are connected in a way not illustrated and obvious for persons skilled in the art and, according to an aspect of the invention, of intermediate bridging means 27 for the resistive wire 21 ( figure 1 ) suited to determine said controlled temperature variation only on, selectively, a first and a second portion, indicated respectively in figures as 21a and 21b, of the wire 21, which consist of the first and second half of the wire 21 itself.
  • the actuator 20 also includes a drum element 28 held idle by the body 6 on suitable supports and which said resistive wire 21 is wound around the circumference; the drum element 28 rotates around an axis B ( figure 2 ) contained in a plane parallel to a plane on which lies the striking plate 8, and holds, angularly integral with and radially projecting from, cam means 31 having a predetermined profile.
  • the bridging means 27 consist of a first flat spring 35, made of an electrically conductive material and connected to a first electric contact 36 which protrudes externally from the body 6 (similar to contacts 23 and 24), and a screw 37 by means of which the spring 35 is connected integrally to the drum 28 so as to pinch the resistive wire 21 in the middle, gripped between the flat spring 35 and the drum 28.
  • the pawl 10 is directly controlled by a bistable elastic device 40, which in turn is commanded, in a way to be described, by the cam means 31.
  • the pawl 10 is directly controlled by the bistable elastic device 40, which cooperates in sliding contact, by rotation, with the cam means 31, situated in a position immediately below it.
  • the bistable elastic device 40 is of the same type as those employed in the known devices of the state of the art using as an actuator a bimetallic spring activated by a PTC pill, for example of the type described in EP1137030B1 by the same Applicant, and comprises a first flat spring 41 and a second flat spring 42 connected together at the respective free ends of the same, adjacent to each other, by a toggle-shaped coupling spring 43, in particular in the shape of an upside-down U (with respect to the position of the axis B), and hinged on the side opposite said free ends of the first and second flat spring, 41 and 42.
  • the pawl 10 is directly anchored to the second flat spring 42 in a known way, not illustrated for simplicity; the flat spring 42, which may have two different configurations, one illustrated as a continuous line and the other only schematically illustrated with a dashed line in figure 2 , is suited to push the pawl 10 into the extended position when the bistable elastic device 40 is in a first predetermined stable configuration, illustrated in the figure; and to hold the pawl in a retracted position when the bistable elastic device 40 is in a second predetermined stable configuration, known and not illustrated, in which the flat spring 42 is in the configuration illustrated with hatching.
  • the pawl 10 is held by the body 6 sliding transversely to the striking plate 8 and the second flat spring 42 is made of an electrically conductive material, and holds a first electric contact element 62, which is suited to cooperate, in one of the stable configurations of the bistable elastic device 40, with a second electric contact element 63 held in a fixed position by the body 6.

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

Abstract

L'invention concerne un dispositif de blocage (1) comprenant un corps pouvant être fixé sur une ossature d'appareil ménager électrique, latéralement à une porte à bloquer, une gâche se présentant sous une forme de plaque de gâche (8) maintenue coulissante par le corps, perpendiculaire à la porte, et conçue pour coopérer lors de son utilisation avec une encoche (9) de la porte, un cliquet (10) pour bloquer le coulissement de la plaque de gâche, et un moyen de commande (11) pour déplacer sélectivement le cliquet entre une position étendue et une position rétractée dans/à partir d'une perforation traversante correspondante (13) de la plaque de gâche. Le moyen de commande comprend un actionneur (20) présentant un fil résistif électriquement conducteur (21) constitué d'un alliage à mémoire pouvant varier sa propre longueur sous l'effet de la chaleur, un moyen (22) pour fournir une puissance électrique commandée au fil résistif conçu pour déterminer les variations de température de manière commandée, par effet joule; et un moyen de came (31) actionné par l'actionneur (20) et agissant sur un dispositif élastique bistable (40) commandant directement la position du cliquet (10).

Claims (8)

  1. Dispositif de blocage (1) pour la porte d'un appareil électroménager, en particulier pour la porte d'une machine à laver à chargement frontal, comprenant
    un corps (6) qui peut être monté sur le châssis de l'appareil électroménager latéralement par rapport à une porte qui doit être bloquée,
    un percuteur qui présente la forme d'une plaque de percussion (8) maintenu à coulissement par le corps perpendiculaire à la porte et conçu pour coopérer en utilisation avec une encoche (9) ménagée dans la porte,
    un cliquet (10) qui bloque le coulissement de la plaque de percussion (8) et
    des moyens de commande (11) qui déplacent de façon sélective le cliquet,
    lesdits moyens de commande (11) comprenant un actionneur (20) constitué d'un alliage à mémoire de forme, des moyens (22) d'alimentation en énergie électrique et des moyens à came (31) actionnés par ledit actionneur (20) et agissant sur un dispositif élastique bistable (40) caractérisé en ce que :
    i. lesdits moyens de commande (11) déplacent ledit cliquet entre une position déployée et une position rétractée par rapport à une perforation correspondante (13) ménagée dans la plaque de percussion,
    ii. ledit actionneur (20) comprend un fil de résistance (21) électriquement conducteur constitué dudit alliage à mémoire, de forme de telle sorte que sa longueur puisse varier en fonction de la variation de sa température,
    iii. lesdits moyens (22) d'alimentation en énergie électrique alimentent en énergie électrique ledit fil de résistance (21) et sont conçus pour déterminer par effet Joule la variation contrôlée de sa température et
    iv. ledit actionneur (20) comprenant aussi un tambour (28) maintenu à rotation libre par ledit corps (6) et autour de la circonférence duquel ledit fil de résistance est enroulé, le tambour maintenant la position angulaire desdits moyens à came (31) agissant sur le dispositif élastique bistable (40) qui coopère directement avec ledit cliquet pour le déplacer sélectivement entre la position déployée et la position rétractée.
  2. Dispositif (1) selon la revendication 1, caractérisé en ce que lesdits moyens (22) d'alimentation en énergie électrique dudit fil de résistance (21) comprennent des moyens (27) de pontage intermédiaire dudit fil de résistance permettant de déterminer sélectivement ladite variation de température contrôlée uniquement sur une première ou une deuxième portion (21a, 21b) du fil.
  3. Dispositif (1) selon les revendications 1 ou 2, caractérisé en ce que le tambour (29) est conçu pour tourner autour d'un axe (B) contenu dans un plan parallèle à un plan sur lequel se trouve ladite plaque de percussion (8), lesdits moyens à came (31) débordant radialement en porte-à-faux dudit tambour (28).
  4. Dispositif (1) selon la revendication 3, caractérisé en ce que lesdits moyens (27) de pontage intermédiaire permettent de produire ladite variation contrôlée de température sélectivement sur une première et une deuxième moitié (21a, 21b) dudit fil de résistance (21) et en ce qu'ils consistent en un premier ressort plat (35) constitué d'un matériau électriquement conducteur et raccordé à un premier contact électrique (36) qui déborde hors dudit corps, ce premier ressort plat (35) étant raccordé d'un seul tenant au tambour (28) de manière à pincer ledit fil de résistance (21) respectivement au milieu du fil et au milieu du tambour.
  5. Dispositif (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit cliquet (10) est directement contrôlé par ledit dispositif électrique bistable (40) qui coopère avec lesdits moyens à came (31).
  6. Dispositif (1) selon la revendication 5, caractérisé en ce que ledit dispositif élastique (40) comprend un premier ressort plat (41) et un deuxième ressort plat (42) adjacents l'un par rapport à l'autre et raccordés l'un à l'autre à leur extrémité libre respective par un ressort (43) de raccordement en forme d'articulation, en particulier en forme de U tourné vers le bas et articulé sur le côté qui fait face auxdites extrémités libres du premier et du deuxième ressort plat (41, 42).
  7. Dispositif (1) selon la revendication 6, caractérisé en ce que ledit cliquet (10) est ancré directement sur ledit deuxième ressort plat (42) qui le repousse dans la position déployée lorsque le dispositif élastique bistable (40) est dans une première configuration stable prédéterminée et qui maintient ledit cliquet (10) dans ladite position rétractée lorsque le dispositif élastique bistable (40) est dans une deuxième configuration stable prédéterminée, le cliquet (10) étant maintenu par le corps (6) coulissant transversalement vers ladite plaque de percussion.
  8. Dispositif (1) selon la revendication 7, caractérisé en ce que ledit deuxième ressort plat (42) est constitué d'un matériau électriquement conducteur et maintient un premier élément (62) de contact électrique qui, lorsque ledit dispositif élastique bistable (40) est dans une desdites configurations stables, coopère de façon sélective avec un deuxième élément (63) de contact électrique immobilisé par ledit corps (6).
EP06710509A 2005-03-08 2006-03-07 Dispositif de blocage pour la porte d'un appareil menager electrique, en particulier la porte d'une machine a laver Expired - Lifetime EP1861535B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000144A ITTO20050144A1 (it) 2005-03-08 2005-03-08 Dispositivo di bloccaggio per una porta di un elettrodomestico, in particolare un oblo' di una lavatrice
PCT/IB2006/000490 WO2006095241A1 (fr) 2005-03-08 2006-03-07 Dispositif de blocage pour la porte d'un appareil menager electrique, en particulier la porte d'une machine a laver

Publications (2)

Publication Number Publication Date
EP1861535A1 EP1861535A1 (fr) 2007-12-05
EP1861535B1 true EP1861535B1 (fr) 2012-05-16

Family

ID=36594420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06710509A Expired - Lifetime EP1861535B1 (fr) 2005-03-08 2006-03-07 Dispositif de blocage pour la porte d'un appareil menager electrique, en particulier la porte d'une machine a laver

Country Status (3)

Country Link
EP (1) EP1861535B1 (fr)
IT (1) ITTO20050144A1 (fr)
WO (1) WO2006095241A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2518243B1 (fr) * 2011-04-28 2019-06-12 Electrolux Home Products Corporation N.V. Appareil électroménager comportant un dispositif de verrouillage de porte
US20150015001A1 (en) * 2011-04-28 2015-01-15 Electrolux Home Products Corporation N.V. Electric Household Appliance Door Locking Device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4414325C1 (de) * 1994-04-25 1995-09-28 Ymos Ag Ind Produkte Verriegelungseinrichtung für eine Waschmaschine oder ähnliche Haushaltsgeräte
SI20537A (sl) 2000-03-23 2001-10-31 Metalflex Električni stikalni sklop za varnostno pripravo v stroju
EP1340870B1 (fr) 2002-02-27 2009-11-18 emz-Hanauer GmbH & Co. KGaA Ensemble avec actionneur à métal doué de mémoire pour verrouillage de portes d'appareils domestique

Also Published As

Publication number Publication date
EP1861535A1 (fr) 2007-12-05
ITTO20050144A1 (it) 2006-09-09
WO2006095241A1 (fr) 2006-09-14

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