EP2537974B1 - Vorrichtung zum Verriegeln und Entriegeln einer Tür eines elektrischen Haushaltsgeräts - Google Patents

Vorrichtung zum Verriegeln und Entriegeln einer Tür eines elektrischen Haushaltsgeräts Download PDF

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Publication number
EP2537974B1
EP2537974B1 EP12173197.0A EP12173197A EP2537974B1 EP 2537974 B1 EP2537974 B1 EP 2537974B1 EP 12173197 A EP12173197 A EP 12173197A EP 2537974 B1 EP2537974 B1 EP 2537974B1
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EP
European Patent Office
Prior art keywords
toothed wheel
locking
actuator
locking member
control
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
EP12173197.0A
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English (en)
French (fr)
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EP2537974A1 (de
EP2537974B9 (de
Inventor
Fabrizio Promutico
Stefano Colucci
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Bitron SpA
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Bitron SpA
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Publication of EP2537974B1 publication Critical patent/EP2537974B1/de
Publication of EP2537974B9 publication Critical patent/EP2537974B9/de
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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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/12—Casings; Tubs
    • D06F39/14—Doors or covers; Securing means therefor
    • 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 device for locking and unlocking a door of a household appliance such as a washing machine or a washer-drier, of the typed defined in the preamble of claim 1.
  • United States Patent US 6 334 637 B1 discloses a device of this type, comprising a support casing with an opening for the introduction of a hook member connected to the door, and with a retaining member which is movable with respect to the casing between a rest position, in which it allows the introduction of the hook member into the opening, and a working position, in which it can retain the hook member introduced into the opening.
  • the device disclosed in this United States Patent further comprises a locking member which is movable between a disengaged position and an engaged position, in which it can allow and prevent, respectively, the passage of the retaining member (slider) from the working position to the rest position, and electrically activatable control devices for controlling the position of this locking member.
  • control devices comprise an electrically controlled actuator adapted, each time it is activated, to cause the rotation by a predetermined amount of a rotatable toothed wheel, which has a predetermined control profile of the cam type.
  • This control profile is coupled to the locking member in such a way that, in at least a first and a second angular position, respectively, the control profile retains and frees, respectively, the locking member, thus preventing and allowing, respectively, its passage from the disengaged position to the engaged position.
  • the aforesaid toothed wheel is placed in the aforesaid (second) angular position in which it allows the locking member to pass to the locking position while the door of the appliance is open, in other words while the retaining member or slider is in a position in which it automatically prevents the locking member from moving outwards and passing to the locking position. If this occurs, and the door is then closed, the engaging member or slider is displaced, and the door is locked in the closed position as a result of the preceding actuation of the aforesaid toothed wheel, without the need to send a further pulse to the coil-type electrical actuator which controls the position of the wheel. In these conditions, the door is locked in the closed position as a result of the "memory" of the preceding actuation of the toothed control wheel, and this may lead to hazardous situations.
  • One object of the present invention is to provide a device for locking and unlocking the door of a household appliance which enables the aforementioned drawback of the prior art devices to be overcome.
  • the number 1 indicates the whole of a locking and unlocking device according to the invention.
  • This device comprises a support casing 2, made of electrically insulating material, intended to be fastened to the structure of a household appliance, in the proximity of a loading or access opening which has an associated door P ( Figure 2 ) provided in a known way with a hook member A.
  • the support casing 2 is formed by two half shells 3 and 4, joined together ( Figure 2 ).
  • the casing 2 of the device 1 has an opening 5 for the introduction of the hook member A carried by the door.
  • the arrangement is such that, when the door is closed, the hook member A engages in the opening or window 7 of the retaining member or slider 6, and causes the latter to be translated (towards the right as seen in Figure 1 ) in such a way as to uncover the opening 8.
  • a switch indicated in a general way by 10 is positioned in the lower half shell 4 of the casing 2.
  • This switch comprises an opposing contact 11 carried by a shaped flexible metal blade 12, of which one end 12a is shaped in the form of a flat pin which acts as a connecting terminal and extends into a recessed seat 18 of the support casing ( Figures 3 to 6 ).
  • the switch 10 further comprises a movable contact 13 ( Figures 3 and 6 to 9 ) carried by the upper face of an end of a metal blade 14, the other end of which is positioned above a shaped metal member 15 ( Figures 3 and 5 ), together with which it is permanently fastened to the support casing, by means of a rivet 16 for example ( Figure 3 ).
  • the end of the blade 14 which carries the movable contact 13 extends under the opposing contact 11.
  • the blades 12 and 14 are made and mounted in such a way that they tend to urge the respective contacts 11 and 13 towards the bottom wall of the half shell 4 of the support casing.
  • the end of the blade 14 which carries the movable contact 13 engages and bears on a lateral projection 9b of the locking member 9, as shown for example in Figures 3 , 5 and 7 to 9 . Consequently, the blade 14 tends to urge the locking member 9 into the lowered position shown in Figure 7 , in which this locking member 9 is in the disengaged position and does not protrude beyond the opening 8 of the casing, and therefore allows the door P to be opened.
  • the metal connecting member 15 forms an appendage or end 15a ( Figure 3 and 5 ) shaped in the form of a flat pin, which extends into the seat 18 of the support casing and acts as a connecting terminal.
  • the locking member 9 has a transverse appendage 9a on the side opposite the blade 14. This appendage interacts, as detailed below, with a cam or toothed profile 23 of a toothed wheel 20 mounted rotatably in the support casing 2 about a pivot 21, adjacently to the locking member 9.
  • the toothed wheel 20 is conveniently made of plastic material. It can be made in one piece or, for simplicity of moulding, can be made in two parts which are bonded or otherwise fixed together.
  • the lower portion of the wheel 20 has toothing in the form of sawteeth 22, while the upper portion of this wheel has a plurality of cams or frontal teeth 23 which are spaced apart angularly with intervals 24 between them ( Figure 5 ).
  • the teeth 23 have a profile in the form of a rectangular trapezium, with one side or flank inclined and the other side or flank at a right angle.
  • the wheel 20 has twelve sawteeth 22 and six upper teeth 23.
  • the pitch of the teeth 23 is equal to two adjacent sawteeth 22.
  • the arrangement is such that, when the radial appendage 9a of the locking member 9 extends on to the top of a cam or tooth 23 of the wheel 20, the locking member 9 is urged into the raised engaged position and held there against the action of the blade 14, as shown in Figure 8 .
  • the number 25 indicates the whole of an electrically operated actuator.
  • this actuator comprises a coil or solenoid 26 in which a core 27 is mounted in an axially translatable way, one end of the core being connected to a rod 28.
  • the end of the rod 28 opposite the core 27 bears on a shaped member indicated as a whole by 29.
  • This member has in its median part a slotted opening 30 in which there extends a fixed stud or pin 31 integral with the support casing of the device.
  • the end 29a of the member 29 which is opposite the actuator 25 is shaped in the form of a catch and engages between a pair of consecutive sawteeth 22 of the toothed wheel 20.
  • the number 32 indicates a pawl which is mounted so that it can oscillate about a fixed pivot 33 and is also engaged between a pair of consecutive sawteeth of the toothed wheel 20, by the force of a coil spring 34 which is interposed between this pawl and the end of the shaped member 29 adjacent to the actuator 25.
  • a positive temperature coefficient (PTC) resistor is connected in series with the winding or coil 26 of the actuator 25.
  • PTC positive temperature coefficient
  • the blade 12 which carries the opposing contact 11 is coupled to an actuating member 40 mounted in a vertically translatable way in the casing 2 along two opposing guides 41 provided in the lower half shell 4 of the casing 4.
  • the actuating member 40 also has an essentially transverse appendage 40a, which interacts with the control profile 23, 24 of the toothed wheel 20. On its other side, the actuating member 40 has a projection 40b which engages under the distal end of the blade 12 which carries the opposing contact 11.
  • the arrangement is such that, when the appendage 40a of the actuating member 40 bears on the top of a tooth or cam 23 of the toothed wheel 20, as shown in Figure 7 , the projection 40b of the actuating member 40 places the blade 12 and its associated opposing contact 11 in a position remote from the movable contact 13 ( Figure 7 ). Conversely, when the appendage 40a of the actuating member 40 bears on an indentation 24 between two consecutive teeth or cams 23 of the wheel 20, it allows the blade 12 and the associated opposing contact 11 to assume a position relatively closer to the movable contact 13 ( Figure 8 ).
  • the locking member 9 and the actuating member 40 are preferably positioned in such a way that, when one of them is raised by the interaction of its transverse appendage 9a or 40a with the cams or teeth 23 of the wheel 20, the other is lowered, under the action of the associated blade 12 or 14, with its appendage 40a or 9a extending in a recess 24 formed between two consecutive cams 23 of the toothed wheel 20 ( Figures 7 and 8 ).
  • the locking and unlocking device described above operates in the following manner.
  • the locking and unlocking device When the door P is open, the locking and unlocking device is in the condition shown in Figures 1, 2 and 7 : the locking member 9 is "covered” by the retaining member or slider 6 ( Figure 1 ) and is held in the retracted disengaged position by the action of the associated blade 14 which bears on the transverse appendage 9a of this member ( Figure 7 ).
  • the actuating member 40 is held in the raised position by the engagement of its appendage 40a with the top of a cam or tooth 23 of the wheel 20, and therefore holds the blade 12 and the opposing contact 11 in a position remote from the movable contact 13. In this condition, the switch 10 is therefore open (the switch is of the "normally open” type).
  • a control unit of the appliance causes the actuator 25 to be energized in a known way.
  • the member 29 causes the toothed wheel 20 to rotate through a distance equal to the angular extension of one tooth 22 of this wheel.
  • the wheel is then in the position shown in Figure 8 , in which the upper portion of the wheel presents the top of a trapezoidal tooth or cam 23 to the radial appendage 9a of the locking member 9. Consequently, the locking member 9 is in the extended engaged position ( Figure 8 ).
  • the actuating member 40 assumes its lowered position in which it causes the blade 12 and the associated opposing contact 11 to be in a position relatively closer to the movable contact 13. This is because the raising of the locking member 9 causes the blade 14 and the associated movable contact 13 to be raised as well, and the contact 13 then engages with the opposing contact 11.
  • the switch 10 is therefore closed.
  • the control unit 40 of the appliance causes two successive energizing pulses to be sent to the coil 26 of the electromagnetic actuator 25, to allow the door to be opened. Consequently, the toothed wheel 20 is made to rotate through a distance corresponding to the extension of two of its sawteeth 22. This rotation causes the radial appendage 9a of the locking member 9 to engage in a new recess 24 formed between two consecutive trapezoidal teeth or cams 23 of this wheel. The locking member 9 is therefore returned, under the action of the associated blade 14, to the retracted or disengaged position shown in Figure 7 , in which it again allows the retaining member or slider 6 to return to the position in which it allows the door to be opened.
  • the actuating member 40 is simultaneously returned to the raised position, causing the blade 12 and the opposing contact 11 to pass to a position remote from the movable contact 13.
  • the operation of the device described above is particularly reliable and prevents the unlocking from being enabled as a result of any undesired energization of the actuator 25, due to the reception of electromagnetic interference for example. Furthermore, the device can easily be modified in such a way that only one energization pulse for the electromagnetic actuator 25 is required for unlocking.
  • the toothed wheel 20 is operated by a control pulse sent to the coil 26 so as to urge the locking member 9 towards the extended position while the door P is open (and therefore while the slider 6 obstructs the opening 8 and prevents any outward movement of the locking member 9), the member 9, being locked by the slider 6, opposes this rotation of the toothed wheel, thus locking the mechanism in its existing position.
  • this wheel 20 remains in the position which it occupied previously, and continues to allow the locking member 9 to be retained in the retracted condition (the disengaged position) by the associated blade 14.
  • the device according to the invention overcomes the drawback of the prior art devices as outlined in the introductory part of this description.
  • the frictional coupling between these members may be such that, after one or more pulses have been sent to the solenoid or coil of the electromagnetic control actuator to cause unlocking, the locking member fails to depart from the extended position and remains in this position, thus locking the slider and the door in the closed position.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Lock And Its Accessories (AREA)
  • Washing And Drying Of Tableware (AREA)

Claims (9)

  1. Vorrichtung zum Verriegeln und Entriegeln einer Tür (P) eines Haushaltsgeräts, umfassend:
    ein mit der Tür (P) zu verbindendes Hakenelement (A),
    ein Tragegehäuse (2) mit einer Öffnung (5) zum Einführen des Hakenelements (A),
    ein Halteelement oder einen Schieber (6), welches/welcher bezüglich des Gehäuses (2) zwischen einer Ruheposition, in welcher es das Einführen des Hakenelements (A) in die Öffnung (5) erlaubt, und einer Arbeitsposition, in welcher es dazu eingerichtet ist, das in der Öffnung (5) eingeführte Hakenelement (A) zu halten, bewegbar ist;
    Verriegelungsmittel (9, 14, 29 bis 34), umfassend:
    ein Verriegelungselement (9), welches in dem Gehäuse (2) zwischen einer eingriffsfreien Position und einer Eingriffsposition, in welcher es dazu eingerichtet ist, den Übergang des Halteelements (6) von der Arbeitsposition in die Ruheposition zu erlauben, bewegbar ist; wobei das Halteelement oder der Schieber (6) in seiner Ruheposition verhindert, dass das Verriegelungselement (9) in die Eingriffs- oder Verriegelungsposition übergeht;
    Gegenmittel (14), welche dem Verriegelungselement (9) zugeordnet sind und dafür vorgesehen sind, es in der eingriffsfreien Position zu halten, und
    elektrisch aktivierbare Steuer-/Regelmittel (20 bis 34), welche dazu eingerichtet sind, die Position des Verriegelungselements (9) zu steuern/regeln;
    wobei die Steuer-/Regelmittel umfassen:
    einen elektrisch steuerbaren/regelbaren Aktuator (25, 26), welcher ein zugeordnetes bewegbares Steuer-/Regelelement (20) aufweist und welcher dafür vorgesehen ist, als Folge von aufeinander folgenden Aktivierungen das Steuer-/Regelelement (20) dazu zu veranlassen, abwechselnd eine erste Position und eine zweite Position einzunehmen, in welcher das Steuer-/Regelelement (20) das Verriegelungselement (9) jeweils freigibt oder vorbelastet, wobei es ihm jeweils erlaubt wird, in der eingriffsfreien Position zu bleiben oder es gegen die Wirkung der Gegenmittel (14) in der Eingriffsposition gehalten wird;
    wobei die Vorrichtung (1) dadurch gekennzeichnet ist, dass das Verriegelungselement (9) dazu angeordnet ist, das Steuer-/Regelelement (20) in der genannten ersten Position zu verriegeln, wenn der Aktuator (25, 26) erregt wird, während das Halteelement oder der Schieber (6) in seiner Ruheposition ist.
  2. Vorrichtung nach Anspruch 1, wobei der Aktuator (25, 26) dazu eingerichtet ist, jedes Mal, wenn er erregt wird, die Drehung eines gezahnten Rads (20) um einen vorbestimmten Betrag hervorzurufen, welches drehbar in dem Gehäuse (2) montiert ist und ein vorbestimmtes Steuerungsprofil mit Nocken oder Zähnen (23) aufweist, welches mit dem Verriegelungselement (9) gekoppelt ist;
    wobei die Anordnung derart ist, dass aufeinander folgende Aktivierungen des Aktuators (25, 26) das gezahnte Rad (20) dazu veranlassen, wenigstens eine erste Winkelposition beziehungsweise eine zweite Winkelposition einzunehmen, in welchen das Steuerungsprofil (23) das Verriegelungselement (9) freigibt beziehungsweise vorbelastet, wodurch es ihm erlaubt wird, in der eingriffsfreien Position zu bleiben beziehungsweise es in der Eingriffsposition gehalten wird.
  3. Vorrichtung nach Anspruch 2, umfassend einen elektrischen Schalter (10), umfassend einen Gegenkontakt (11) und einen bewegbaren Kontakt (13), wobei letzterer von einem ersten flexiblen Blatt (14) aus einem elektrisch leitfähigen Material getragen ist, welches in dem Tragegehäuse (2) montiert ist, wobei das erste Blatt (14) mit dem zuvor genannten Verriegelungselement (9) derart gekoppelt ist, dass das erste Blatt (14) dazu eingerichtet ist, den Schalter (10) zu veranlassen, geschlossen zu werden, wenn das bewegbare Verriegelungselement (9) in der zuvor genannten Eingriffsposition ist, in welcher verhindert wird, dass die Tür (P) geöffnet wird; wobei
    der Gegenkontakt (11) von einem zweiten flexiblen Blatt (12) aus einem elektrisch leitfähigen Material getragen ist, welches in dem Tragegehäuse (2) montiert ist; wobei das zweite Blatt (12) mit einem bewegbar in dem Gehäuse (2) montierten Aktivierungselement (40) gekoppelt ist und wiederum mit dem Steuerungsprofil (23) des gezahnten Rads (20) derart gekoppelt ist, dass ein Übergang des gezahnten Rads (20) von der ersten Position in die zweite Position beziehungsweise von der zweiten Position in die erste Position jeweils einen Übergang des zweiten Blatts (12) und des ihm zugeordneten Gegenkontakts (11) von einer Position entfernt von dem bewegbaren Kontakt (13) zu einer Position nahe dazu beziehungsweise von einer Position nahe dem beweglichen Kontakt (13) zu einer Position entfernt davon hervorruft.
  4. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das gezahnte Rad (20) einen Ring von Sägezähnen (22) in gleichen Winkelabständen aufweist, welche mit einem hakenförmigen Ende (29a) eines Steuer-/Regelelements (29) wechselwirken, welches in dem Tragegehäuse (2) unter der Wirkung des Aktuators (25) bewegbar montiert ist; wobei die Anordnung derart ist, dass jede Erregung des Aktuators (25) über das Steuer-/Regelelement (29) eine Drehung des gezahnten Rads (20) über eine Strecke hervorruft, welche einem Zahn (22) des Rings von Sägezähnen entspricht.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Steuerungsprofil (23) des gezahnten Rads (20) eine derartige Anzahl von Nocken oder Zähnen (23) aufweist, dass wenigstens eine Erregung der Aktuators (20) notwendig ist, um das gezahnte Rad (20) dazu zu veranlassen, von der zweiten Position in die erste Position überzugehen.
  6. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Steuerungsprofil des gezahnten Rads (23) eine derartige Anzahl von Nocken oder Zähnen (23) aufweist, dass wenigstens zwei aufeinander folgende Erregungen des Aktuators (25) notwendig sind, um das gezahnte Rad (20) dazu zu veranlassen, von der zweiten Position in die erste Position überzugehen.
  7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass das gezahnte Rad (20) das Steuerungsprofil (23) an der dem Ring von Sägezähnen (22) gegenüberliegenden Seite aufweist.
  8. Vorrichtung nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass das gezahnte Rad (20) eine zugeordnete schwenkende Stabilisierungsklinke (32) aufweist, welche zwischen zwei aufeinander folgenden Zähne (22) des Rings unter der Wirkung von zugeordneten elastischen Mitteln (34) in Eingriff bringbar ist, welche dafür vorgesehen sind, es in Richtung des gezahnten Rads (20) vorzubelasten.
  9. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Aktuator (25) einen Solenoid (26) und einen zugeordneten bewegbaren Kern (27) umfasst.
EP12173197.0A 2011-06-24 2012-06-22 Vorrichtung zum Verriegeln und Entriegeln einer Tür eines elektrischen Haushaltsgeräts Not-in-force EP2537974B9 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000556A ITTO20110556A1 (it) 2011-06-24 2011-06-24 Dispositivo di bloccaggio e sbloccaggio del portello di un apparecchio elettrodomestico

Publications (3)

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EP2537974A1 EP2537974A1 (de) 2012-12-26
EP2537974B1 true EP2537974B1 (de) 2014-09-17
EP2537974B9 EP2537974B9 (de) 2015-02-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107245845A (zh) * 2017-08-10 2017-10-13 温州天健电器有限公司 一种洗衣机门锁

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107916539A (zh) * 2017-12-07 2018-04-17 青岛海尔滚筒洗衣机有限公司 一种分配器盒及洗衣机的控制方法
IT201800002107A1 (it) * 2018-01-29 2019-07-29 Illinois Tool Works Modulo interruttore di blocco motorizzato per un blocco-porta per elettrodomestici

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1202431B (it) * 1987-01-27 1989-02-09 Onofrio Rocchitelli Dispositivo per il bloccaggio rapido e lo sbloccaggio ritardato dei dispositivi di chiusura di portelli di macchine aventi nell'interno parti soggette a rotazione inerziale in particolare per portelli di macchine lavabiancheria
IT1303590B1 (it) * 1998-12-18 2000-11-14 Bitron Spa Dispositivo di bloccaggio e sbloccaggio del portello di un apparecchioelettrodomestico.
DE10038376C2 (de) * 2000-08-07 2003-04-30 Zangenstein Elektro Türverriegelung für die Tür eines elektrischen Haushaltsgerätes
ITTO20030273A1 (it) * 2003-04-09 2004-10-10 Bitron Spa Dispositivo di bloccaggio e sbloccaggio del portello
ITTO20070476A1 (it) * 2007-06-29 2008-12-30 Itw Metalflex Druzba Za Proizv Dispositivo elettromagnetico di bloccaggio per una porta di un elettrodomestico, in particolare un oblo' di una lavatrice
ITTO20080224A1 (it) * 2008-03-25 2009-09-26 Bitron Spa Apparecchiatura elettrica con porta provvista di un dispositivo di bloccaggio a comando elettrico

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107245845A (zh) * 2017-08-10 2017-10-13 温州天健电器有限公司 一种洗衣机门锁
CN107245845B (zh) * 2017-08-10 2019-02-12 温州天健电器有限公司 一种洗衣机门锁

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ITTO20110556A1 (it) 2012-12-25
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