EP1726750A1 - A device for locking the porthole door of a washing machine - Google Patents
A device for locking the porthole door of a washing machine Download PDFInfo
- Publication number
- EP1726750A1 EP1726750A1 EP06003357A EP06003357A EP1726750A1 EP 1726750 A1 EP1726750 A1 EP 1726750A1 EP 06003357 A EP06003357 A EP 06003357A EP 06003357 A EP06003357 A EP 06003357A EP 1726750 A1 EP1726750 A1 EP 1726750A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- locking
- slider
- porthole door
- door
- porthole
- 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
Links
- 238000005406 washing Methods 0.000 title claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 3
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000011664 signaling Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
- E05B47/0009—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with thermo-electric actuators, e.g. heated bimetals
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door
Definitions
- the present invention relates to electronic components of domestic appliances and particularly to a safety latch device for locking the porthole door of a washing machine and similar appliances.
- Front load washing machines are provided with a porthole door laterally hinged to the front panel of the washing machine and provided with a closure hook in a diametrically opposite position with respect to the hinged one, such hook being engaged by a locking device also mounted on the front panel.
- the locking device incorporates a device, generally known as "door lock deviceā for immediately locking the porthole door and for its release.
- a door lock device The function of a door lock device is that of blocking the closed porthole door when the machine is being started and of delaying the opening of the porthole door once the operating cycle has been terminated until the inertial rotation of the tub has stopped. Moreover the door lock device prevents the starting of the machine when the porthole door is open.
- the arrangement for locking the porthole hook comprises a sliding bolt adapted to engage the hook for closing the porthole door, which interacts with a locking plug or peg that is actuated upon the occurrence of predetermined conditions for the blade of the movable contact in a microswitch that is connected in series on a phase line carrying the current of the machine.
- the movable contact of the microswitch is in turn operated by a deformation (bending) of one or more bimetallic strips that are properly heated by a thermistor, also this latter being electrically connected to the machine controls.
- the operation of the device provides that upon supplying power to the machine after closing the porthole door, the plug snaps into such a position to block the sliding bolt that engages the porthole hook, thus preventing the opening of the porthole door until the plug has been driven back.
- the return motion of the blocking plug will take occur after a given delay with respect to the current interruption, this delay being a function of the cooling time and the characteristics of the thermistor-bimetallic strip assembly.
- the invention allows for detecting whether the porthole door is open or closed and for using such information, for instance, to activate a visual signalling without requiring the addition of further connections.
- the device according to the invention comprises an elongated body or case 1, preferably of a thermoplastic material, that comprises a portion 2 to be fastened to the front panel of a washing machine, such portion being provided with a closing lid 4 and a portion 3 adapted to house an electromechanical time delaying device 20.
- a sliding member or slider 7 is housed inside the body 1 and is movable against spring (resilient) means 8.
- the slider provides for an opening or hole 9 adapted for engaging the end of the porthole hook 6 and a window 13 formed in correspondence of the area housing the electromechanical delaying device 20.
- a seat 10 is provided for receiving a locking plug or peg 21 actuated by the electromechanical delaying device 20.
- a contact spring 11 is fitted to a transverse member 12 that is fastened to the slider 7.
- Device 20 is an electromechanical delaying device of a substantially known type, comprising a snapping contact blade 22 driving the locking plug 21, a thermistor or a P.C.T. resistor 23 and a bimetallic arrangement with two strips 24 and 25, located one over the other.
- the device 20 is provided with three electrical terminals protruding outside into a seat, and forming a set of quick connection terminals, namely a terminal 26 connected to the snapping contact blade 22, an NA contact terminal 27 and a contact terminal for applying a voltage to the P.T.C. 23.
- the conductive member applying a voltage to the P.T.C. 23 is made up by two metal blades 28 , 29 the ends of which project from the housing of the door locking device 20, with the blades positioned one in front of the other and contained in the space formed by the window 13 formed in the slider 7.
- the blade 29 protrudes in the form of a quick-connection contact in a seat provided therefor (see Figure 6), while the other end of the blade 28 is connected to an adjustment grub screw 30 onto which rests the strip 25 (this connection not being shown in the figure).
- the device fulfils therefore the function of a microswitch for signalling the open/closed condition of the porthole door without increasing the number of terminals.
- the arrangement of the device is such as to allow a creeping of the spring 11 over the fixed contacts 28, 29 during the closing and the opening of the circuit. Such action has a self-cleaning effect since it can break oxides that might have formed over the contacts and ensures a long term proper operation of the device.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Thermally Actuated Switches (AREA)
- Washing And Drying Of Tableware (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Push-Button Switches (AREA)
- Fuses (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
- Water Treatment By Sorption (AREA)
Abstract
Description
- The present invention relates to electronic components of domestic appliances and particularly to a safety latch device for locking the porthole door of a washing machine and similar appliances.
- Front load washing machines are provided with a porthole door laterally hinged to the front panel of the washing machine and provided with a closure hook in a diametrically opposite position with respect to the hinged one, such hook being engaged by a locking device also mounted on the front panel.
- In addition to allowing the door opening and its snap closure, the locking device incorporates a device, generally known as "door lock device" for immediately locking the porthole door and for its release.
- The function of a door lock device is that of blocking the closed porthole door when the machine is being started and of delaying the opening of the porthole door once the operating cycle has been terminated until the inertial rotation of the tub has stopped. Moreover the door lock device prevents the starting of the machine when the porthole door is open.
- There are known devices both electromechanical and electronic that accomplish the above functions.
- More particularly there are known devices in which the arrangement for locking the porthole hook comprises a sliding bolt adapted to engage the hook for closing the porthole door, which interacts with a locking plug or peg that is actuated upon the occurrence of predetermined conditions for the blade of the movable contact in a microswitch that is connected in series on a phase line carrying the current of the machine. The movable contact of the microswitch is in turn operated by a deformation (bending) of one or more bimetallic strips that are properly heated by a thermistor, also this latter being electrically connected to the machine controls.
- The operation of the device provides that upon supplying power to the machine after closing the porthole door, the plug snaps into such a position to block the sliding bolt that engages the porthole hook, thus preventing the opening of the porthole door until the plug has been driven back. The return motion of the blocking plug will take occur after a given delay with respect to the current interruption, this delay being a function of the cooling time and the characteristics of the thermistor-bimetallic strip assembly.
- If power is supplied to the machine when the porthole door is open, the displacement of the blocking plug, and therefore the closing of the machine actuating circuit, is inhibited by the position of the sliding bolt.
- Such devices therefore mechanically prevent the starting of the machine when the porthole door is open, but have the drawback that the thermistor is being fed until the porthole door has been closed.
- Moreover a possible open condition of the porthole door is not detected without using an additional microswitch for signalling the open/closed condition of the door.
- It is an object of the present invention to provide a device for locking the porthole door of washing machines and the like that overcome the limitations and the drawbacks of the prior art, and more particularly that not only mechanically prevents the starting of the machine when the porthole door is open, but also inhibits the closing of the electric circuit of the device.
- Moreover the invention allows for detecting whether the porthole door is open or closed and for using such information, for instance, to activate a visual signalling without requiring the addition of further connections.
- According to the invention these objects are achieved through a device for locking the porthole door of a washing machine as claimed in
claim 1. Further advantageous characteristics are recited in the dependent claims. - The invention will now be disclosed with reference to the attached drawings that illustrate a preferred, but non limiting embodiment of the invention, in which:
- Fig. 1 is an axonometric exploded view that illustrates a locking device according to the invention;
- Fig. 2 is a front view showing the locking device of Fig. 1 in an open position of the porthole;
- Fig. 3 is a cross-section view along line I-I of Fig. 2;
- Fig. 4 is a front view showing the device of Fig. 1 in a closed position of the porthole;
- Fig. 5 is a cross-section view along line II-II of Fig. 4;
- Fig. 6 shows two different axonometric views of the locking device of Figure 1.
- With reference to Figures 1 to 5, the device according to the invention comprises an elongated body or
case 1, preferably of a thermoplastic material, that comprises aportion 2 to be fastened to the front panel of a washing machine, such portion being provided with aclosing lid 4 and aportion 3 adapted to house an electromechanicaltime delaying device 20. - In the
fastening portion 2 there is formed anopening 5 for receiving thehook 6 of the porthole. - A sliding member or
slider 7 is housed inside thebody 1 and is movable against spring (resilient) means 8. The slider provides for an opening orhole 9 adapted for engaging the end of theporthole hook 6 and awindow 13 formed in correspondence of the area housing theelectromechanical delaying device 20. Aseat 10 is provided for receiving a locking plug or peg 21 actuated by theelectromechanical delaying device 20. - A
contact spring 11 is fitted to atransverse member 12 that is fastened to theslider 7. -
Device 20 is an electromechanical delaying device of a substantially known type, comprising asnapping contact blade 22 driving thelocking plug 21, a thermistor or a P.C.T.resistor 23 and a bimetallic arrangement with twostrips - Referring to Figure 6, the
device 20 is provided with three electrical terminals protruding outside into a seat, and forming a set of quick connection terminals, namely aterminal 26 connected to thesnapping contact blade 22, anNA contact terminal 27 and a contact terminal for applying a voltage to the P.T.C. 23. - The conductive member applying a voltage to the P.T.C. 23 is made up by two
metal blades door locking device 20, with the blades positioned one in front of the other and contained in the space formed by thewindow 13 formed in theslider 7. Theblade 29 protrudes in the form of a quick-connection contact in a seat provided therefor (see Figure 6), while the other end of theblade 28 is connected to anadjustment grub screw 30 onto which rests the strip 25 (this connection not being shown in the figure). - The operation of the device according to the invention is as follows.
- When the porthole door is open, the reciprocal positions of the parts forming the device are shown in Figures 2 and 3. More particularly the opening 9 of the
slider 7 subjected to the action of thespring 8 is axially aligned with theopening 5. Accordingly theresilient contact 11 is in an opening position in respect of the ends of terminals (blades) 28 and 29, i.e. no power is applied to the P.T.C. 23 even if the machine is powered. - As shown in Figures 4 and 5, upon closing the porthole door the
hook 6 is inserted in thehole 9 and pushes forward theslider 7. Consequently thecontact spring 11 is driven to a closing position over thecontacts - The closing of the circuit allows therefore the feeding of the P.T.C. 23 and consequently activates the mechanism for locking the
slider 7. - More precisely a current circulates through the
contact 28, thegrub screw 30, thebimetal strips strip 24 thus causing its bending and the consequent snapping downwards of thestrip 22. This way the circuit ofterminal 26 andterminal 27 is closed and a voltage is applied to the machine movers. At the same time thelocking plug 21 penetrates the housing (seat) 10 of theslider 7 thus blocking this latter in a position retaining theporthole hook 6 as long as the above condition is maintained. - By reading the ohmic value of the circuit formed by the terminal blade - terminal contact P.T.C. (bimetal) it is possible to detect the open/closed condition of the machine porthole door.
- The device fulfils therefore the function of a microswitch for signalling the open/closed condition of the porthole door without increasing the number of terminals.
- Additionally the arrangement of the device is such as to allow a creeping of the
spring 11 over thefixed contacts - The invention has been illustrated with reference to preferred embodiments, but more generally the same is susceptible of other applications and changes that fall within the scope of the invention, as it will be evident to the skilled of the art.
Claims (5)
- A device for locking the porthole door of a washing machine and similar appliances, comprising a case (1) housing a slider (7) cooperating with the end of a hook (6) secured to the machine porthole door, and an electromechanical delaying device (20) capable of blocking said slider (7) upon the occurrence of predetermined conditions by means of a locking plug (21), said electromechanical delaying device (20) being provided with a thermistor (23) electrically connected to the operating controls of the washing machine, characterised in that
one of the conductive members for applying a voltage to said thermistor (23) comprises two metal blades (28, 29) the ends of which project from the case of the delaying device (20) and are located one in front of the other in correspondence of a conductive member (11) fastened to said slider (7) and adapted to close the electric circuit when the porthole door is closed. - A locking device as claimed in claim 1 characterised in that said conductive member (11) is formed as a resilient contact positioned on a transverse member (12) fastened to said slider (7).
- A locking device as claimed in claims 1 or 2, characterised in that said contact terminal or blade (29) projects outside of the electromechanical delaying device (20) into a seat formed as a quick connection contact.
- A locking device as claimed in the preceding claims, characterised in that said electromechanical delaying device (20) comprises a snap contact blade (22) that actuates the locking plug (21) and is in turn operated by a bimetallic arrangement comprising two strips (24 and 25) heated by said thermistor (23).
- A locking device as claimed in claim 4, characterised in that that said strip (28) is connected to an adjustment grub screw (30) connected to said bimetallic strip (25).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL06003357T PL1726750T3 (en) | 2005-02-25 | 2006-02-20 | A device for locking the porthole door of a washing machine |
SI200630091T SI1726750T1 (en) | 2005-02-25 | 2006-02-20 | A device for locking the porthole door of a washing machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000297A ITMI20050297A1 (en) | 2005-02-25 | 2005-02-25 | BLOCCOPORTA FOR WASHING MACHINES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1726750A1 true EP1726750A1 (en) | 2006-11-29 |
EP1726750B1 EP1726750B1 (en) | 2008-08-20 |
Family
ID=36935700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06003357A Active EP1726750B1 (en) | 2005-02-25 | 2006-02-20 | A device for locking the porthole door of a washing machine |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1726750B1 (en) |
CN (1) | CN1824879B (en) |
AT (1) | ATE405718T1 (en) |
DE (1) | DE602006002310D1 (en) |
ES (1) | ES2313468T3 (en) |
IT (1) | ITMI20050297A1 (en) |
PL (1) | PL1726750T3 (en) |
SI (1) | SI1726750T1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009007802A1 (en) * | 2007-07-10 | 2009-01-15 | Indesit Company S.P.A. | Device and method for locking and unlocking the door of a household appliance |
CN108457049A (en) * | 2017-02-20 | 2018-08-28 | Bsh家ēØēµåØęéå ¬åø | Laundry care appliance with electric mechanical component |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101666028B (en) * | 2008-09-02 | 2012-11-14 | ē½å°å¾·ēµå·„ęęÆęéč“£ä»»å ¬åø | Locking device for closing cap of washing machine |
IT1402217B1 (en) * | 2010-10-05 | 2013-08-28 | Bitron Spa | CONTROL CIRCUIT FOR AN ELECTRICALLY OPERATED ACTUATOR, IN PARTICULAR AN SOLENOID ACTUATOR |
US9957657B2 (en) | 2015-01-30 | 2018-05-01 | Emz-Hanauer Gmbh & Co. Kgaa | Appliance lock |
CN107227586B (en) * | 2016-03-25 | 2023-11-24 | ä¼å©čÆŗęÆå·„å ·å¶åęéå ¬åø | Electric appliance door lock, electromagnetic door lock assembly and electric appliance |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0004012A2 (en) * | 1978-03-11 | 1979-09-19 | Ellenberger & Poensgen GmbH | Door locking device for electrical apparatuses |
GB2174140A (en) * | 1985-04-03 | 1986-10-29 | Omp Off Meccano Plast | A device for locking the door of a washing-machine more particularly a clothes washing-machine |
JP2000014980A (en) * | 1998-07-03 | 2000-01-18 | Hitachi Ltd | Electric washing machine |
FR2811006A1 (en) * | 2000-06-30 | 2002-01-04 | Bitron Spa | DOOR LOCKING DEVICE, PARTICULARLY FOR A HOUSEHOLD APPLIANCE |
US6363755B1 (en) * | 1999-12-07 | 2002-04-02 | Ark-Les Corporation | Timed release washing machine lid lock |
-
2005
- 2005-02-25 IT IT000297A patent/ITMI20050297A1/en unknown
-
2006
- 2006-02-20 PL PL06003357T patent/PL1726750T3/en unknown
- 2006-02-20 AT AT06003357T patent/ATE405718T1/en not_active IP Right Cessation
- 2006-02-20 DE DE602006002310T patent/DE602006002310D1/en active Active
- 2006-02-20 ES ES06003357T patent/ES2313468T3/en active Active
- 2006-02-20 SI SI200630091T patent/SI1726750T1/en unknown
- 2006-02-20 EP EP06003357A patent/EP1726750B1/en active Active
- 2006-02-24 CN CN200610051427XA patent/CN1824879B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0004012A2 (en) * | 1978-03-11 | 1979-09-19 | Ellenberger & Poensgen GmbH | Door locking device for electrical apparatuses |
GB2174140A (en) * | 1985-04-03 | 1986-10-29 | Omp Off Meccano Plast | A device for locking the door of a washing-machine more particularly a clothes washing-machine |
JP2000014980A (en) * | 1998-07-03 | 2000-01-18 | Hitachi Ltd | Electric washing machine |
US6363755B1 (en) * | 1999-12-07 | 2002-04-02 | Ark-Les Corporation | Timed release washing machine lid lock |
FR2811006A1 (en) * | 2000-06-30 | 2002-01-04 | Bitron Spa | DOOR LOCKING DEVICE, PARTICULARLY FOR A HOUSEHOLD APPLIANCE |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009007802A1 (en) * | 2007-07-10 | 2009-01-15 | Indesit Company S.P.A. | Device and method for locking and unlocking the door of a household appliance |
CN108457049A (en) * | 2017-02-20 | 2018-08-28 | Bsh家ēØēµåØęéå ¬åø | Laundry care appliance with electric mechanical component |
CN108457049B (en) * | 2017-02-20 | 2021-12-28 | Bsh家ēØēµåØęéå ¬åø | Garment care appliance with electromechanical component |
Also Published As
Publication number | Publication date |
---|---|
SI1726750T1 (en) | 2009-02-28 |
CN1824879B (en) | 2010-09-29 |
PL1726750T3 (en) | 2009-01-30 |
ES2313468T3 (en) | 2009-03-01 |
ATE405718T1 (en) | 2008-09-15 |
ITMI20050297A1 (en) | 2006-08-26 |
CN1824879A (en) | 2006-08-30 |
DE602006002310D1 (en) | 2008-10-02 |
EP1726750B1 (en) | 2008-08-20 |
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