EP2537973A1 - Dispositif de verrouillage et de déverrouillage d'une porte d'un appareil domestique électrique - Google Patents

Dispositif de verrouillage et de déverrouillage d'une porte d'un appareil domestique électrique Download PDF

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Publication number
EP2537973A1
EP2537973A1 EP12173182A EP12173182A EP2537973A1 EP 2537973 A1 EP2537973 A1 EP 2537973A1 EP 12173182 A EP12173182 A EP 12173182A EP 12173182 A EP12173182 A EP 12173182A EP 2537973 A1 EP2537973 A1 EP 2537973A1
Authority
EP
European Patent Office
Prior art keywords
toothed wheel
locking member
locking
door
blade
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.)
Granted
Application number
EP12173182A
Other languages
German (de)
English (en)
Other versions
EP2537973B1 (fr
Inventor
Fabrizio Promutico
Stefano Colucci
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.)
Bitron SpA
Original Assignee
Bitron SpA
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Filing date
Publication date
Application filed by Bitron SpA filed Critical Bitron SpA
Publication of EP2537973A1 publication Critical patent/EP2537973A1/fr
Application granted granted Critical
Publication of EP2537973B1 publication Critical patent/EP2537973B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/44—Opening, closing or locking of doors

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.
  • United States Patent US 6 334 637 B1 held by the present applicant 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 or slider 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 or slider from the working position to the rest position, and an electrically activatable control device for controlling the position of this locking member.
  • This locking and unlocking device further comprises an electric switch including a fixed contact and a movable contact.
  • the latter is carried by a flexible metal blade which is coupled to the locking member in such a way that it can cause the switch to close when the locking member is in the engaged position in which it prevents the door from opening.
  • a situation may arise in which the pressure of the movable member or slider on the movable locking member causes this member to be retained in its extended position, in which the door is locked. If this situation arises in the prior art device, not only does the door remain locked in the closed position, but the aforesaid switch also remains closed. Since this switch controls the supply of power to various devices in the household appliance, this situation may lead to a risk of overheating, and in exceptional circumstances may cause a fire to start.
  • 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 fin 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 7 .
  • 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 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) of the associated blade 14.
  • 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)
EP12173182.2A 2011-06-24 2012-06-22 Dispositif de verrouillage et de déverrouillage d'une porte d'un appareil domestique électrique Not-in-force EP2537973B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000557A ITTO20110557A1 (it) 2011-06-24 2011-06-24 Dispositivo di bloccaggio e sbloccaggio del portello di un apparecchio elettrodomestico

Publications (2)

Publication Number Publication Date
EP2537973A1 true EP2537973A1 (fr) 2012-12-26
EP2537973B1 EP2537973B1 (fr) 2014-09-17

Family

ID=44513050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12173182.2A Not-in-force EP2537973B1 (fr) 2011-06-24 2012-06-22 Dispositif de verrouillage et de déverrouillage d'une porte d'un appareil domestique électrique

Country Status (2)

Country Link
EP (1) EP2537973B1 (fr)
IT (1) ITTO20110557A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105927069A (zh) * 2015-02-27 2016-09-07 emz-汉拿两合有限公司 用于家用电器的门闩锁
CN108118492A (zh) * 2016-11-29 2018-06-05 青岛海尔洗衣机有限公司 洗衣机门锁检测装置及检测方法
WO2018236746A1 (fr) * 2017-06-21 2018-12-27 Illinois Tool Works Inc. Verrou d'appareil résistant à la contamination
IT201800004000A1 (it) * 2018-03-27 2019-09-27 Illinois Tool Works Blocco-porta per elettrodomestici, in particolare lavatrici e simili, con meccanismo di riduzione di forza perfezionato

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988005476A1 (fr) * 1987-01-27 1988-07-28 Onofrio Rocchitelli Verrou de porte, pour machine a laver en particulier
US6334637B1 (en) 1998-12-18 2002-01-01 Bitron S.P.A. Locking and unlocking device for the door of a domestic electrical appliance
US20020017793A1 (en) * 2000-08-07 2002-02-14 Georg Spiessl Latching mechanism for the door of an electric household appliance
EP1467048A1 (fr) * 2003-04-09 2004-10-13 BITRON S.p.A. Dispositif de verrouillage pour des appareils électroménagers
WO2005106099A1 (fr) * 2004-04-27 2005-11-10 Marquardt Gmbh Verrou pour appareil menager
WO2009004447A1 (fr) * 2007-06-29 2009-01-08 Itw Metalflex, Druzba Za Proizvodnjo Delov Za Gospodinjske Aparate, D.O.O. Dispositif de blocage électromagnétique pour la porte d'un appareil électroménager
EP2105527A1 (fr) * 2008-03-25 2009-09-30 BITRON S.p.A. Appareil électrique avec porte dotée d'un dispositif de verrouillage à commande électrique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988005476A1 (fr) * 1987-01-27 1988-07-28 Onofrio Rocchitelli Verrou de porte, pour machine a laver en particulier
US6334637B1 (en) 1998-12-18 2002-01-01 Bitron S.P.A. Locking and unlocking device for the door of a domestic electrical appliance
US20020017793A1 (en) * 2000-08-07 2002-02-14 Georg Spiessl Latching mechanism for the door of an electric household appliance
EP1467048A1 (fr) * 2003-04-09 2004-10-13 BITRON S.p.A. Dispositif de verrouillage pour des appareils électroménagers
WO2005106099A1 (fr) * 2004-04-27 2005-11-10 Marquardt Gmbh Verrou pour appareil menager
WO2009004447A1 (fr) * 2007-06-29 2009-01-08 Itw Metalflex, Druzba Za Proizvodnjo Delov Za Gospodinjske Aparate, D.O.O. Dispositif de blocage électromagnétique pour la porte d'un appareil électroménager
EP2105527A1 (fr) * 2008-03-25 2009-09-30 BITRON S.p.A. Appareil électrique avec porte dotée d'un dispositif de verrouillage à commande électrique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105927069A (zh) * 2015-02-27 2016-09-07 emz-汉拿两合有限公司 用于家用电器的门闩锁
CN105927069B (zh) * 2015-02-27 2017-12-29 emz-汉拿两合有限公司 用于家用电器的门闩锁
CN108118492A (zh) * 2016-11-29 2018-06-05 青岛海尔洗衣机有限公司 洗衣机门锁检测装置及检测方法
WO2018236746A1 (fr) * 2017-06-21 2018-12-27 Illinois Tool Works Inc. Verrou d'appareil résistant à la contamination
IT201800004000A1 (it) * 2018-03-27 2019-09-27 Illinois Tool Works Blocco-porta per elettrodomestici, in particolare lavatrici e simili, con meccanismo di riduzione di forza perfezionato
WO2019190975A1 (fr) * 2018-03-27 2019-10-03 Illinois Tool Works Inc. Système de verrouillage pour appareils ménagers, en particulier machines à laver et similaires, ayant un mécanisme de réduction de force amélioré
CN112272719A (zh) * 2018-03-27 2021-01-26 伊利诺斯工具制品有限公司 具有改进的减力机构的用于家用电器，特别是洗衣机等的门锁
CN112272719B (zh) * 2018-03-27 2023-09-01 伊利诺斯工具制品有限公司 具有改进的减力机构的用于家用电器，特别是洗衣机等的门锁

Also Published As

Publication number Publication date
ITTO20110557A1 (it) 2012-12-25
EP2537973B1 (fr) 2014-09-17

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