EP2167718B1 - Verfahren zur verriegelung und entriegelung der tür eines haushaltsgeräts - Google Patents

Verfahren zur verriegelung und entriegelung der tür eines haushaltsgeräts Download PDF

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Publication number
EP2167718B1
EP2167718B1 EP08719344A EP08719344A EP2167718B1 EP 2167718 B1 EP2167718 B1 EP 2167718B1 EP 08719344 A EP08719344 A EP 08719344A EP 08719344 A EP08719344 A EP 08719344A EP 2167718 B1 EP2167718 B1 EP 2167718B1
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EP
European Patent Office
Prior art keywords
thermistor
solenoid
voltage
door
household appliance
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
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EP08719344A
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English (en)
French (fr)
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EP2167718A1 (de
Inventor
Costantino Mariotti
Claudio Fontana
Savio Labella
Giovanni Bombardieri
Pasquale Somma
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Whirlpool EMEA SpA
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Indesit Co SpA
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Publication date
Application filed by Indesit Co SpA filed Critical Indesit Co SpA
Priority to PL08719344T priority Critical patent/PL2167718T3/pl
Publication of EP2167718A1 publication Critical patent/EP2167718A1/de
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Publication of EP2167718B1 publication Critical patent/EP2167718B1/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
    • 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
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/10—Power supply arrangements, e.g. stand-by circuits

Definitions

  • the present invention relates to a method for locking and unlocking the door of a household appliance according to the preamble of claim 1, as well as to an associated door lock.
  • the present invention relates to the field of washing and drying machines, wherein it is necessary to ensure that the load door is locked during some laundry treatment steps which are considered to be dangerous.
  • washing and/or drying machines are provided with devices for locking and unlocking the door.
  • the electric actuator consists of a solenoid in which a movable element can slide axially.
  • the movable element moves to a position which depends on the number and polarity of the applied pulses.
  • the actuator is thus controlled in such a manner that the movable element extends to at least two locking positions and can move backwards inside the solenoid to a door unlocking position.
  • the electric actuator consists of a solenoid in which a sliding ferromagnetic core is moved by applying an alternating voltage to the solenoid for short intervals of time.
  • Each voltage pulse applied to the solenoid causes the movable element to move and engage into a mechanical transmission which can cyclically take three positions, i.e. two door locking positions and one door unlocking position.
  • the safety level imposed by the Standards is thus achieved through the aforementioned mechanical transmission, which requires that two pulses be applied to the solenoid in order to switch from a locking position to the unlocking position.
  • EP-0439849 discloses a method for locking and unlocking a door of a household appliance according to the preamble of claim 1.
  • the present invention is based on the general idea of using a thermistor, in particular a PTC (Positive Temperature Coefficient) thermistor, arranged in series with the solenoid of the electric actuator as a safety device against any unintentional unlocking of the door due to malfunctions or faults such as a short circuit or "diode mode" operation of the triac controlling the power to the solenoid.
  • a thermistor in particular a PTC (Positive Temperature Coefficient) thermistor, arranged in series with the solenoid of the electric actuator as a safety device against any unintentional unlocking of the door due to malfunctions or faults such as a short circuit or "diode mode" operation of the triac controlling the power to the solenoid.
  • the invention provides for a safety locking step to be carried out before the potentially dangerous operating steps of the machine, wherein the door of the household appliance is locked and the thermistor is heated for the purpose of increasing its resistance up to a value such that, even if the full power voltage of the household appliance is applied across the actuator-thermistor pair, the voltage drop generated across the actuator will be lower than the voltage value to be exceeded for the electric actuator to actuate the locking and unlocking means.
  • this solution allows to prevent the door from being unlocked should any electric malfunctions or faults occur, without necessarily requiring a double unlocking pulse nor the use of any particular transmission in order to achieve the safety conditions set out by the Standards.
  • Fig. 1 diagrammatically shows a locking device according to the present invention.
  • the device has a pair of terminals (L and N) for its connection to the wires (phase and neutral, respectively) of a single-phase AC power line.
  • the device comprises an electric actuator 1 comprising a solenoid 2 connected to phase and neutral through a PTC thermistor 3 and a triac 4.
  • the triac 4 is essentially a switch controlled by a control unit 5 (in particular a microcontroller) which regulates the opening and closing thereof, thus adjusting the current flow through solenoid 2 and thermistor 3.
  • microcontroller 5 carries out a phase control of triac 4 in order to apply to the solenoid-thermistor pair an alternating voltage having a root mean square value between zero and a maximum value obtained when the triac is kept constantly closed.
  • Fig. 1 when triac 4 is closed the solenoid-thermistor pair is connected across the phase and neutral terminals, and therefore said maximum value matches the root mean square value of the power voltage.
  • solenoid 2 Inside solenoid 2 there is an axially sliding ferromagnetic core 6 which represents a movable element capable of engaging with locking means 7, which will be described below, so as to move them from a door locking position to a door unlocking position.
  • locking means 7 comprise a movable rod 8 which can engage into an aperture 9 and stop the movement of a slider 10, thus locking the door.
  • a metal contact 11 e.g. a copper plate, of a master switch 12 that, when closed, allows power to be supplied to loads 13 of the household appliance, e.g. motor, pumps, etc.
  • rod 8 On the other side, rod 8 has a protrusion 14 that engages under teeth 15 of a cogwheel 16.
  • the wheel 16 also has an upper toothing 19 acted upon by a lever 17 which makes wheel 16 turn.
  • lever 17 makes wheel 16 rotate at each stroke in such a manner that protrusion 14 of rod 8 alternatively engages either under a tooth 15 (position p1 in Fig. 2 ) or within the space between two consecutive teeth 15 (position p2 in Fig. 3 ).
  • Lever 17 is slideably mounted in a direction parallel to the longitudinal axis (x) of solenoid 2, so that movable element 6, when engaging lever 17, will turn wheel 16.
  • a ratchet 18 acts upon the toothing 19 in order to prevent the wheel 16 from turning in the opposite direction to the motion caused by lever 17.
  • Ratchet 18 is held against the wheel by a spring 20 acting between the ratchet and lever 17.
  • spring 20 exerts a force onto movable element 6 to push it into solenoid 2.
  • the movable element For wheel 16 to turn, the movable element must therefore be pushed out of the solenoid by a force being great enough to overcome the resistance of spring 20.
  • teeth 15 of wheel 16 are so spaced that at each stroke of lever 17 the wheel moves by an angle corresponding to one tooth 19, with protrusion 14 being alternatively held either in a lower position p1 (shown in Fig. 2 ), corresponding to a situation wherein the door is unlocked and switch 12 is open, or a position p2 (shown in Fig. 3 ), in which protrusion 14 gets between two teeth 15 and allows rod 8 to come back up and engage slider 10, thus closing switch 12.
  • Fig. 4 shows a time-based diagram that clearly illustrates the control carried out by microcontroller 5 for the purpose of providing the machine safety locking function.
  • Fig. 4 indicates the root mean square value of the voltage applied across the solenoid-thermistor pair of Fig. 1 .
  • the wash cycle starts at time to and lasts until time t 1 ; as known, said cycle includes different steps with the drum being turned in alternate directions.
  • the drum is turned at rather low speeds, e.g. approx. 45-55 rpm, and with a small quantity of water in the tub; for this reason, the wash step is not considered to be dangerous.
  • the rinse step takes place from time t 1 to time t 2 , wherein the drum is turned at high speeds (exceeding 60 rpm) and there is more water in the tub than during the wash step; this step is therefore considered to be dangerous and therefore the door must remain locked for its entire duration.
  • the microcontroller closes the triac, so that the full power voltage of the household appliance is applied across the solenoid-thermistor pair; in this example, said voltage is assumed to be the mains voltage typically available in household environments, namely 220V rms @50Hz in Europe and 110V rms @60Hz in the USA.
  • the solenoid and the thermistor remain energized for the whole wash and rinse steps.
  • Rod 8 thus engages into aperture 9 and the door is locked (position p2 in Fig. 3 ).
  • any malfunctions or faults will mainly affect the thermistor and only to a very small extent the solenoid, so that they cannot cause a sufficient voltage drop across the solenoid to cause a new actuation of the locking means (rotation of wheel 16), which would unlock the door.
  • the washing machine When rinsing is over, the washing machine carries out a series of rotations which are necessary in order to detach the laundry items adhered to one another at the periphery of the drum due to the effect of the spinning performed during the rinse cycles.
  • the method according to the invention provides for deenergizing solenoid 2 and thermistor 3 through a command sent by microcontroller 5 to open triac 4.
  • the thermistor can thus cool down and its impedance decreases.
  • the impedance of the solenoid and of the thermistor become comparable again.
  • microcontroller 5 can apply a voltage pulse across the solenoid-thermistor pair in order to trip lever 17 and wheel 16, thus moving rod 8 from the position p2 to the position p1, in which the door is unlocked.
  • said unlocking pulse has an amplitude equal to the power voltage and a duration t 3 -t 4 of 40 ms, corresponding to two power voltage cycles, assuming a frequency of 50 Hz.
  • the user wants to open the door during the wash step, which is not regarded as dangerous, he/she has to press a pushbutton or turn a knob in order to instruct the microcontroller to unlock the door.
  • the microcontroller receives the user's instruction and opens triac 4 in order to let thermistor 3 cool down, after which it sends an unlocking pulse as described above.
  • FIG. 5 there is shown an alternative solution for controlling the device for locking and unlocking the door of a household appliance.
  • a 220V 40ms pulse is applied (t 0 -t 5 ) across the solenoid-thermistor pair; due to the reasons explained above, said pulse trips wheel 16 and moves rod 8 from the door unlocking position p1 to the door locking position p2.
  • the solenoid remains de-energized until time t 5 ; during the interval t 5 -t 6 the microcontroller, following an instruction sent by the user (and after having verified that the household appliance is not carrying out a dangerous operating step) can instantly unlock the door by sending a new 220V pulse to the solenoid-thermistor pair.
  • the invention Prior to the rinse step (which is regarded as dangerous), the invention provides for putting the machine in a safety condition, so that a malfunction or fault (such as a short circuit or the triac operating in "diode mode") cannot cause the door of the household appliance to unlock as rinsing is taking place.
  • a malfunction or fault such as a short circuit or the triac operating in "diode mode
  • microcontroller 5 acts upon triac 4 to increase the voltage applied across the solenoid-thermistor pair, so that said voltage increases without the voltage drop across the solenoid exceeding the value at which the locking means are actuated; this is made possible by the increased thermistor resistance.
  • microcontroller 5 progressively increases the duty cycle of triac 4 so as to increase the root mean square value of the voltage applied across the solenoid-thermistor pair without thereby determining the actuation of the locking means, because the voltage on the solenoid is always too low to allow said actuation.
  • microcontroller 5 detects the opening of master switch 12 and applies a new pulse to the solenoid-thermistor pair in order to lock the door.
  • the method forces the solenoid-thermistor pair to remain energized during all dangerous steps, while still keeping the voltage drop across the solenoid below the value of actuation of the locking means.
  • the dangerous operating steps may also include those steps of wash treatment wherein the temperature of the wash liquid exceeds 50°C (although these steps are not regarded as dangerous by the Standards currently in force).
  • the solenoid-thermistor pair may therefore be conveniently kept energized, while keeping the voltage drop across the solenoid below the value of actuation of locking means, also when the temperature of the wash liquid is higher than 50°C.
  • Fig. 6 This situation is shown in Fig. 6 , where the microcontroller puts the machine in the safe condition again before a second dangerous step (e.g. a spin step) by applying a voltage pulse (instants t 8 -t 9 ) such that rod 8 is moved to the locking position.
  • a second dangerous step e.g. a spin step
  • a heating step is performed again on PTC thermistor 3 (instants t' 6 -t' 7 ), wherein the thermistor resistance increases and makes the electric actuator become essentially "immune" from malfunction.
  • microcontroller 5 At the end of the spin cycle, the machine is in a safe condition.
  • microcontroller 5 When the user sends a door unlocking command, microcontroller 5 generates a voltage pulse (instants t 12 -t 13 ) to unlock the door.
  • the PTC thermistor heating step (aiming at increasing the thermistor resistance) can be carried out by increasing the voltage applied across the solenoid-thermistor pair according to a strictly increasing monotonic curve, e.g. a ramp (as shown in Fig. 5 ), or according to a non-decreasing monotonic curve, comprising for example step-like profiles.
  • a strictly increasing monotonic curve e.g. a ramp (as shown in Fig. 5 )
  • a non-decreasing monotonic curve comprising for example step-like profiles.
  • the microcontroller controls the triac in such a manner that a rather high voltage is applied right away, e.g. 40 V rms, which voltage is anyway lower than the value at which the force exerted onto the movable element overcomes the resistance of the return means (e.g. the spring 20 of Fig. 1 ).
  • the microcontroller can increase the applied voltage according to a ramp, as shown in Fig. 7 .
  • Fig. 8 shows another possible curve representing the increase in the voltage applied across the solenoid-thermistor pair, wherein between time t 6 and time t 8 the voltage is increased according to a ramp having a different slope than the ramp from t 8 to t 7 .
  • triac 4 is then controlled by microcontroller 5 in such a manner as to apply across the solenoid a voltage having a root mean square value which is lower than the 220V power voltage but anyway great enough to ensure that the current flowing through the PTC thermistor can keep the latter's resistance at a sufficiently high value.
  • the value of the voltage to be applied to the solenoid is determined on the basis of the fact that the heating caused by the current flow must be sufficient to prevent the PTC thermistor from cooling down; since this current can be obtained by means of a voltage lower than the maximum voltage (220V rms) across the phase and neutral terminals, a reduction in energy consumption is also obtained.
  • the preferred values of the voltage to be constantly applied to the solenoid are between 80V and 150V rms.
  • the root mean square voltage lower than 220V rms can be obtained through a phase control which, by modulating the closing instant of the triac 4, allows to suitably cut a portion of the half-waves of the alternating voltage and obtain the desired root mean square value.
  • the root mean square voltage lower than 220V rms can be obtained through a waveform consisting of a sequence of wave trains of the mains voltage, said sequence of wave trains being predetermined and in particular depending on the root mean square value of the voltage to be applied to the solenoid (and consequently to the PTC thermistor arranged in series with the solenoid).
  • a voltage of (220/X)V rms (where X>1) is to be applied to the solenoid
  • a power cycle may be implemented wherein the solenoid is supplied with the full mains voltage (e.g.
  • the waveform therefore consists of a series of N wave trains followed by a null voltage for a period corresponding to N ⁇ (X-1) half-waves mains voltage.
  • the invention is not limited to the locking means described with reference to Figs. 1-3 : several alternative mechanical solutions may in fact replace the above-described cogwheel and lever 17 used for transmitting the locking/unlocking command from the movable element to the locking means.
  • triac 4 may be replaced with any other electromechanical or semiconductor-type switch.
  • Triac 4 and microcontroller 5 may then be arranged on an independent printed circuit connected to a module containing the solenoid, the thermistor and the locking and unlocking means.
  • the thermistor resistance may also be increased by using external devices, such as heating elements, thus further reducing the heating step duration.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Cookers (AREA)
  • Lock And Its Accessories (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Electric Ovens (AREA)
  • Vending Machines For Individual Products (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (13)

  1. Verfahren zum Verriegeln und Entriegeln einer Tür eines Haushaltsgerätes, wobei Türverriegelungsmittel durch ein elektrisches Betätigungselement betätigt werden, wenn das Betätigungselement eine Spannung empfängt, die einen vorgegebenen Wert übersteigt, wobei das Betätigungselement eine Solenoidspule umfasst, die angepasst ist, ein bewegbares Element zu bewegen, das verschiebbar im Inneren der Solenoidspule angebracht ist,
    wobei das Verfahren einen Haushaltsgerät-Sicherheitsverriegelungsschritt umfasst, wobei die Verriegelungsmittel zu einer Türverriegelungsposition gesetzt werden und ein Thermistor, der in Reihe mit der Solenoidspule verbunden ist, durch einen durch die Solenoidspule fließenden Strom erhitzt wird, um seinen Widerstand bis zu solch einem Wert zu erhöhen, dass, wenn die volle Spannungsleistung des Haushaltsgerätes an das Betätigungselement-Thermistor-Paar angelegt wird, ein Spannungsabfall unter den vorgegebenen Wert an dem Betätigungselement erzeugt wird, wobei das Verfahren dadurch gekennzeichnet ist, dass der Sicherheitsverriegelungsschritt die folgenden Schritte umfasst:
    - Anlegen eines Spannungsimpulses an das Solenoidspule (2)-Thermistor (3)-Paar, so dass der Spannungsabfall an der Solenoidspule (2) einen Effektivwert hat, der den vorgegebenen Wert übersteigt, um so die Verriegelungsmittel (7) zu der Türverriegelungsposition zu setzen (p2),
    - vor einem Betriebsschritt des Haushaltsgerätes, während dessen es nicht erlaubt sein darf, dass die Tür geöffnet wird, Durchführen eines Thermistor-Heizschrittes, wobei die Spannung, die an das Solenoidspule-Thermistor-Paar angelegt wird, in solch einer Weise erhöht wird, dass die angelegte Spannung bis zu einem Maximalwert ansteigt, ohne dass der Spannungsabfall an der Solenoidspule den vorgegebenen Wert aufgrund des erhöhten Widerstandes des Thermistors übersteigt,
    - Halten des Solenoidspule (2)-Thermistor (3)-Paares unter Spannung.
  2. Verfahren nach Anspruch 1, wobei der Sicherheitsverriegelungsschritt die folgenden Schritte umfasst:
    - Anlegen einer Spannung an das Solenoidspule-Thermistor-Paar, so dass der Spannungsabfall an der Solenoidspule (2) einen Effektivwert hat, der den vorgegebenen Wert übersteigt, um so die Verriegelungsmittel (7) zu der Türverriegelungsposition zu setzen (p2),
    - Halten des Solenoidspule (2)-Thermistor (3)-Paares unter Spannung.
  3. Verfahren nach Anspruch 2, wobei das Solenoidspule (2)-Thermistor-Paar unter Spannung gehalten wird, bis eine der folgenden Bedingungen eintritt:
    - ein Nutzer des Haushaltsgerätes sendet einen Türentriegelungsbefehl,
    - zumindest ein Betriebsschritt des Haushaltsgerätes, während dessen es nicht erlaubt sein darf, dass die Tür geöffnet wird, ist beendet.
  4. Verfahren nach Anspruch 2 oder 3, wobei die an das Solenoidspule (2)-Thermistor (3)-Paar angelegte Spannung beibehalten wird, bis alle Betriebsschritte des Haushaltsgerätes, während derer es nicht erlaubt sein darf, dass die Tür geöffnet wird, beendet sind.
  5. Verfahren nach Anspruch 1, wobei der Anstieg in der angelegten Spannung einer nicht-abfallenden monotonen Kurve folgt.
  6. Verfahren nach Anspruch 5, wobei die Kurve eine streng ansteigende monotone Kurve ist.
  7. Verfahren nach Anspruch 5 oder 6, wobei die Kurve eine Rampe umfasst.
  8. Verfahren nach einen der Ansprüche 5 bis 7, wobei die Kurve einen ersten Schritt umfasst, bei dem die angelegte Spannung einen Wert erreicht, der niedriger ist als der vorgegebene Wert.
  9. Verfahren nach einen der vorangegangenen Ansprüche, wobei ein Mikrokontroller das Öffnen und Schließen eines Schalters (4) steuert, der angepasst ist, das elektrische Betätigungselement (1) mit der Spannungsleistung des Haushaltsgerätes zu verbinden, um die an das Betätigungselement-Thermistor-Paar angelegte Spannung zu regulieren.
  10. Verfahren nach Anspruch 9, wobei der Mikrokontroller einen Türentriegelungsbefehl von einem Nutzer des Haushaltsgerätes empfängt, und wobei der Mikrokontroller bestimmt, ob es möglich ist, die Tür zu entriegeln oder nicht, und, wenn dies möglich ist, der Mikrokontroller den Schalter öffnet, um den Thermistor herunterzukühlen, und der Mikrokontroller anschließend an das Betätigungselement-Thermistor-Paar solch eine Spannung anlegt, dass der Spannungsabfall an dem Betätigungselement so ist, dass die Verriegelungsmittel betätigt werden und in eine Entriegelungsposition gebracht werden.
  11. Verfahren nach Anspruch 9, wobei der Mikrokontroller einen Türentriegelungsbefehl von einem Nutzer des Haushaltsgerätes empfängt, und wobei der Mikrokontroller bestimmt, ob es möglich ist, die Tür zu entriegeln oder nicht, und wobei, wenn dies möglich ist, der Mikrokontroller an das Betätigungselement-Thermistor-Paar solch eine Spannung anlegt, dass der Spannungsabfall an dem Betätigungselement so ist, dass die Verriegelungsmittel betätigt werden und in eine Entriegelungsposition gebracht werden.
  12. Verfahren nach einen der vorangegangen Ansprüche, wobei der Thermistor ein Kaltleiter-Thermistor ist.
  13. Verfahren nach einen der Ansprüche 1 bis 12, wobei, nachdem der Thermistor erhitzt worden ist und einen Widerstandswert erreicht hat, so dass, wenn die volle Spannungsleistung des Haushaltsgerätes an das Betätigungselement-Thermistor-Paar angelegt wird, ein Spannungsabfall an dem Betätigungselement erzeugt wird, der unter dem vorgegebenen Wert liegt, eine Spannung mit einem Effektivwert, der niedriger ist als der Effektivwert der Netzspannung, die zur Energieversorgung des Haushaltsgerätes verwendet wird, an die Solenoidspule angelegt wird.
EP08719344A 2007-07-10 2008-03-20 Verfahren zur verriegelung und entriegelung der tür eines haushaltsgeräts Not-in-force EP2167718B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08719344T PL2167718T3 (pl) 2007-07-10 2008-03-20 Sposób blokowania oraz odblokowania drzwiczek urządzenia gospodarstwa domowego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000501A ITTO20070501A1 (it) 2007-07-10 2007-07-10 Dispositivo e metodo per bloccare e sbloccare la porta di un elettrodomestico
PCT/IB2008/000660 WO2009007802A1 (en) 2007-07-10 2008-03-20 Device and method for locking and unlocking the door of a household appliance

Publications (2)

Publication Number Publication Date
EP2167718A1 EP2167718A1 (de) 2010-03-31
EP2167718B1 true EP2167718B1 (de) 2012-03-28

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EP08719344A Not-in-force EP2167718B1 (de) 2007-07-10 2008-03-20 Verfahren zur verriegelung und entriegelung der tür eines haushaltsgeräts

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EP (1) EP2167718B1 (de)
AT (1) ATE551461T1 (de)
IT (1) ITTO20070501A1 (de)
PL (1) PL2167718T3 (de)
WO (1) WO2009007802A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20080224A1 (it) * 2008-03-25 2009-09-26 Bitron Spa Apparecchiatura elettrica con porta provvista di un dispositivo di bloccaggio a comando elettrico
IT1402217B1 (it) * 2010-10-05 2013-08-28 Bitron Spa Circuito di controllo per un attuatore a comando elettrico, in particolare un attuatore a solenoide

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1236884B (it) 1989-12-18 1993-04-26 Onofrio Rocchitelli Dispositivo per il bloccaggio dei mezzi di chiusura ed apertura dei portelli di macchine aventi nell'interno parti soggette a rotazione inerziale realizzante la chiusura e l'apertura dei contatti dell'interruttore serie rispettivamente posticipata ed anticipata al bloccaggio del portello
IT1303590B1 (it) 1998-12-18 2000-11-14 Bitron Spa Dispositivo di bloccaggio e sbloccaggio del portello di un apparecchioelettrodomestico.
EP1217117B1 (de) * 2000-12-22 2005-03-02 Elektromanufaktur Zangenstein, Hanauer GmbH & Co. KGaA Vorrichtung zum Sperren und Freigeben eines Türschlosses eines elektrischen Gerätes
ITTO20030554A1 (it) * 2003-07-17 2005-01-18 Eltek Spa Dispositivo di attuazione e/o bloccaggio per apparecchi elettrodomestici avente un migliorato sistema di controllo dell'attuazione.
ITMI20050297A1 (it) * 2005-02-25 2006-08-26 Elettrotecnica Rold Srl Bloccoporta per lavatrici

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PL2167718T3 (pl) 2012-08-31
ITTO20070501A1 (it) 2009-01-11
EP2167718A1 (de) 2010-03-31
WO2009007802A1 (en) 2009-01-15
ATE551461T1 (de) 2012-04-15

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