US3892933A - Apparatus for locking and related releasing of closure devices of doors of machines, more particularly for washing machines - Google Patents

Apparatus for locking and related releasing of closure devices of doors of machines, more particularly for washing machines Download PDF

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Publication number
US3892933A
US3892933A US309415A US30941572A US3892933A US 3892933 A US3892933 A US 3892933A US 309415 A US309415 A US 309415A US 30941572 A US30941572 A US 30941572A US 3892933 A US3892933 A US 3892933A
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United States
Prior art keywords
wax
piston
locking
latch
locking pin
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Expired - Lifetime
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US309415A
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English (en)
Inventor
Onofrio Rocchitelli
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Individual
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Individual
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Filing date
Publication date
Priority claimed from IT3166471A external-priority patent/IT941377B/it
Priority claimed from IT2151572A external-priority patent/IT1003043B/it
Priority claimed from IT2372572A external-priority patent/IT1044838B/it
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3892933A publication Critical patent/US3892933A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B04B7/06—Safety devices ; Regulating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/08—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body in connection with the locking of doors, covers, guards, or like members giving access to moving machine parts

Definitions

  • the present invention relates to an apparatus for locking and belated releasing of closure devices of doors of machines having internal parts rotating at high speed, more particularly for washing machines.
  • Primary object of the present invention is to provide a door locking device, giving a wide safety guarantee, as it locks the door before starting the machine, keeping the locking action throughout the entire operation of the machine and after interruption of the current until any rotating member is completely standstill.
  • the door locking device has also the function of switch series connected to the door. so as to avoid closure of the machine actuating circuits if the door is not perfectly closed. and this device is placed in a position which cannot be reached by the user so that it is absolutely impossible to actuate the machine. even voluntarily. with the door open.
  • the apparatus of the present invention substantially consists of a sliding latch cooperating with the hook of the door closure lock, said latch being associated with a pin adapted to lock the latch when some conditions are occurring. said pin being actuated, in a first embodiment of the invention. by an electromagnet connected to the machine actuating controls and its opening being delayed by a fluid pump.
  • the delay is obtained by a device made according to the known wax thermostats (widely used in the automative industry), suitably modified and improved, wherein a pin held in a container partially filled with a particular wax. is expelled by the expansion of wax caused by heating of said container and is withdrawn under an external thrust during the cooling stage of said container.
  • FIG. I is a sectional view of the detail of the positions of the latch and door closure hook with the door open, common to all the embodiments of the invention.
  • FIG. 2 is a sectional view of the detail of the apparatus latch when the door is closed and the relative position of said latch and of the door closure lock. common to all the embodiments of the invention;
  • FIG. 3 is a partly sectioned view of the apparatus with electromagnet and delaying air pump in the rest stage with open door;
  • FIG. 4 is a view of the apparatus with electromagnet and delaying air pump in the working stage, locking the closed door;
  • FIG. 5 is a plan and sectional view on enlarged scale of the detail of the piston of the delaying pump
  • FIG. 6 is a view of the apparatus with electromagnet and delaying liquid pump in the rest stage with open door;
  • FIG. 7 is a view of the apparatus with electromagnet and delaying liquid pump in the working stage. locking the closed door;
  • FIG. 8 is a view of the apparatus with wax thermostat in the rest stage with open door
  • FIG. 9 is a view of the apparatus with wax thermostat in the working stage with lock of the closed door
  • FIG. 10 is a View of an apparatus similar to FIG. 8, with the application of the control device for washing machines with electronic program;
  • FIG. 11 is a view of an apparatus similar to FIG. 9. with the application of the control device for washing machines with electronic program;
  • FIG. I2 is an enlarged detail of FIG. I0;
  • FIG. I3 is an enlarged detail of FIG. II.
  • the door locking device according to a first embodiment of the invention consists of a box I for containing all the members ofthe apparatus. said box containing more particularly at latch 2 engaging and locking the head ofa hook 3 of the machine door lock.
  • This latch 2 is constantly held urged downwards by the spring 4 and at its top there is a hole 5 for a locking pin 6. Latch 2 is held in axial position of hole 5 with pin 6 through the pawl 7.
  • the locking pin 6 is constantly held in opening position by the action of spring 8 and with its extension 9 passes through the fixed magnetic core I0 and at its end is provided with a vibration dampening gasket II through which it leans the movable core I2.
  • Electromagnet is formed by an external core I3 en velopping it completely, so as to keep enclosed the electromagnetic flux, a coil I4, the movable core l2 and the fixed core 10.
  • the movable core 12 is for wardly extended with a stem 15 ending with the piston I6 which can slide in a chamber I7. Said chamber is in communication with the atmosphere at the stem through the gap existing around the movable core I2.
  • Piston I6 is formed by a frustum-conical body of plastic material having the cross section shown in FIG. 5 and bearing at its upper flat portion a set of very little holes 27 ofa number and sizes varying according to the desired time delay.
  • Piston 16 in its closure position allows passage of air through its outer edges 16, which on the contrary have a sealing effect when the piston is moving in the contrary direction. so that the fluid is compelled to pass through said holes 27 delaying the return stroke.
  • a microswitch unit comprising a blade with contact 18 actuated by the pushbutton 19 and born by a Zlike arm 20 which can be rotated around pin 2i. whose opposite end 22 is arranged at the hole 23 for the introduction of hook 3 of the door, and having its terminal 24 connected to one of the poles of the current supply line. The other end of the current supply line reaches the terminal 25.
  • the energization circuit of the coil is ending at the terminals 25 and 26 so that it is energized only when the door lock hook acting on the end 22 of arm 20 lets current to pass to the coil.
  • the operation of the apparatus is the following: upon closure of the door of the washing machine, its hook 3 is inserted on one side into the recess 23 so as to act with the lower part on the end 22 of arm 20 so as to lower it and to keep it in said position (see FIGS. l2) and with the upper part on the latch 2 so as to become associated thereto (see also FIGS. 1-2).
  • arm 20 is moving downwards, so that lever 20 rotating around the pin 21 causes the pushhutton 19 to act on blade 18 of the microswitch so as to close the circuit of energization of the coil of the electromagnet.
  • the fixed core is magnetized, attracting the movable core 12 which in turn urges the pin 6 to be inserted in the hole 5 of the latch 2 and the air contained in the upper part of the chamber passes in the lower part of chamber 17. The whole remains in this conditions up to the completion of the working cycle of the machine.
  • the vibration dampening gasket 11 has the function to avoid that the vibrations of the movable core 12 be cause of the current circulating in the coil. are passing to the latch 2.
  • the current at the terminals 2525 is interupted by the machine control unit so that the coil is disenergized and under the push of spring 8 the pin 6 may be withdrawn and comes outfrom the hole 4 releasing the latch 2, allowing lifting and extraction of the hook of the machine door.
  • Opening of the machine door may therefore take place only when the pin 6 is completely disengaged from hole 5, that is after those predetermined l045 seconds spent by the piston 16 under the action of the spring, to return from position of FIG. 4 to that shown in FIG. 3.
  • the apparatus in the case that for the operation of the delaying pump it is desired to use a liquid such as oil, instead of air, the apparatus is modified as shown in FIGS. 6 and 7.
  • the chamber 17 instead of being in communication with external air through the outer walls of the movable core 12 at its upper part, is closed by a complementary chamber 28 which acts a seal on the shaft of the piston, and such a chamber 28 is filled with a liquid which passes from one side to the other of the piston 16 according to its movements.
  • FIGS. 8 and 9 A second embodiment of the present invention is shown in FIGS. 8 and 9 wherein all the other members of the apparatus are unaltered, but the moving and timing element consists of an apparatus made along the known principles of a wax thermostat. substantially comprising an internally hollow metal body which is partially filled with a particular wax having a high thermal expansion coefficient, eventually mixed with additives (copper, aluminum powder etc.) and on which a pin or piston is inserted and held in contact with the wax by means of an external thrust, said piston being expelled when the ambient in which said hollow body of the thermostat is inserted, is brought to a higher temperature because of the expansion of the wax, and always under the thrust of the external element, is withdrawn when the ambient in which the hollow body of the thermostat is inserted is cooled and the wax returns to its original volume.
  • a wax thermostat substantially comprising an internally hollow metal body which is partially filled with a particular wax having a high thermal expansion coefficient, eventually mixed with additives (copper, aluminum powder etc.) and on which a pin or piston is inserted and held
  • Such a type of thermostat is widely used in the automotive industry and is generally applied on the engine cooling circuit, to control various members connected to said circuit.
  • Such a thermostat has a reliable and lasting operation allowing tens of thousands of operations.
  • the invention does not only comprise only the application of a known wax thermostat device, as the conventional wax thermostats for the automotive industry cannot be applied in this case because they are too slow in their extraction movement, they fuse and therefore the phenomenon of the wax expansion takes place at a temperature of about 8()90 and they cool down also very slowly, while for the present application to washing machines it is required an almost immediate extraction and a withdrawal within a period of approximately 15 to seconds.
  • thermostat bodies Some measures were tested for speeding up the operations more particularly of the expansion phase, by making thermostat bodies with very thin outer walls in order to feel at once the effect of a heat source placed outside them, but the maximum effort was above all to choose with advantage for the duration, substances having in addition to a high coefficient of thermal expansion and a high velocity of expansion, a lower melting point, that is between 40 and C.
  • the door locking device comprises, like the preceding one, a box 1 for enclosing all the members of the apparatus. which more particularly contains a latch 2 which engages and locks the head of the hook 3 of the machine door lock.
  • This latch 2 is held constantly urged downwards by a spring 4 and at its top has a hole 5 for a locking pin of predetermined length, which is the extreme extension of a cylinder 29 provided with an internal cylindrical cavity 30 wherein it slides under friction exerted by a rubber ring 31 and a rod 32.
  • the latch 2 is held in a position of axial alignment of the hole 5 with the extension 35 by means of the pawl 7.
  • the locking pin 35 is constantly held in the opening position by the spring 36 acting on the rod 32.
  • the rod 32 is connected to the cylindrical body 37 which in turn is connected to the piston 38 which through the interposition of a pad of elastic material 39 (rubber, neoprene, etc.) partially fills the cavity of a cylinder 40 being the body ofa wax thermostat, the remaining portion of which is filled by a particular wax.
  • a pad of elastic material 39 rubber, neoprene, etc.
  • the cylinder 40 is sorrounded by an electric resis tance 41 having one end connected to the terminal 25 and the other to the contact terminal 42 and through the contact 43, spring 36 and contact 44 to the other terminal 26.
  • a microswitch unit formed by a blade with contact 18 actuated by the push-button 19 born by a Z like arm 20 capable of rotating around the pin 21 and the other end 22 reaching the hole 23 of introduction of the hook 3 of the machine door. and having the terminal 24 connected to one of the wires of the current supply line.
  • the second wire coming from the current supply line reaches the terminal 25.
  • the resistance circuit ends at the ter' minals 25 and 26 so that it is fed only when the machine door closure hook acting on the extreme part 22 of the lever 20 supplies tension to the resistance 41.
  • the operation ofthe apparatus is the following; Upon closure of the door of the washing machine. its extreme hook 3 is inserted from one side in the recess 23, acting with its lower part on the end 22 of the lever 20 so as to lower and keep it in such a position (see details in FIGS. 1 and 2) and with the upper part on the latch 2 so as to become associated thereto (see also FIGS. 1 and 2) Following this action the arm 20 is moved downwardly, so that lever 20 rotating around the pin 21 causes the pushbutton 19 to act on the blade 18 of the microswitch, closing the circuit and supplying tension to the resistance 41.
  • rod 32 may go on in its forward movement, sliding in the inner cavity 30 of the cylinder 29. In this position the contacts 42 and 43 are being separated so as to break the current feeding the resistance 41 which as a consequence cools down (see FIG. 9).
  • cylinder 40 may be provided at both ends with a plurality of cooling pins 45, whose dimensions are depending from the return speed of the piston 38.
  • the elastic pad 39 interposed between the wax and the piston 38 has the function of acting as a sealing gasket for avoiding emission of wax in the event of overheating and for warranting this function it is slightly packed of the action exerted on it by spring 36 on piston 38.
  • the apparatus according to the present invention is provided with a further microswitch shown in FIGS. 10 to 13.
  • the insulating pin 50 of a microswitch comprising a base fixed on the box 1 containing the various elements of the device, two fixed contacts 52 and 53 series connected on the circuit of energization of the electronic programmer and the movable contact 54 fixedly joined to the insulating pin 50 electrically connected with the contact 53 through the led 55.
  • the operation of the device is the following:
  • latching devices For use in controlling the locking and releasing of latching devices on access closures in machines such as washing machines and the like, internal members of which machines preferably cease movement prior to the time when such closures may be opened for internal access thereto.
  • latching devices include a moveable latch device for cooperative interengagement with an associated hook member, which latch is to be locked in closed position during operation of the machine by a locking pin and is to be unlocked by actuation of said locking pin at the end of the machine operation with a pre-determined time delay, apparatus comprising a locking pin actuated by a piston moveable in a chamber, means for selectively heating said chamber according to the operative condition of the machine, and a heat expansible. low melting point wax contained in said chamber, expansion of which wax will cause actuation of said locking pin to effect locking of said latch in closed position and contraction of which wax will cause actuation of said pin to effect unlocking of said latch.
  • heating means comprises an electrical resistance heater which surrounds said chamber.
  • a pole of the electrical resistance heater is divided into two contacts, one of which is fixed and the other is movable with the piston so that the two maintain contact and complete an electrical circuit except when the piston is actuated by the wax thermostat to position the locking pin in locked position whereby the locking pin is maintained in a locked position without continuous applica tion of electrical energy to the electrical resistance heater and without wax over-heating and excessive pressure generation within the chamber.
  • the expansible wax comprises a mixture of waxes having a melting point below about C.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Lock And Its Accessories (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Temperature-Responsive Valves (AREA)
US309415A 1971-11-26 1972-11-24 Apparatus for locking and related releasing of closure devices of doors of machines, more particularly for washing machines Expired - Lifetime US3892933A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT3166471A IT941377B (it) 1971-11-26 1971-11-26 Apparato per il bloccaggio e lo sbloccaggio ritardato dei dispo sitivi di chiusura di portelli in particolare per macchine la vatrici
IT2151572A IT1003043B (it) 1972-03-07 1972-03-07 Apparato per il bloccaggio e lo sbloccaggio ritardato dei dispo sitivi di chiusura di portelli in particolare per macchine la vatrici
IT2372572A IT1044838B (it) 1972-04-28 1972-04-28 Apparato per il bloccaggio e losbuoccaggio ritardato dei dispositivo di chiusura di portelli in particolare per macchine lavatriici

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US3892933A true US3892933A (en) 1975-07-01

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US309415A Expired - Lifetime US3892933A (en) 1971-11-26 1972-11-24 Apparatus for locking and related releasing of closure devices of doors of machines, more particularly for washing machines

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US (1) US3892933A (enrdf_load_stackoverflow)
AT (1) AT326599B (enrdf_load_stackoverflow)
BE (1) BE791863A (enrdf_load_stackoverflow)
CH (1) CH550356A (enrdf_load_stackoverflow)
DE (1) DE2257587C2 (enrdf_load_stackoverflow)
FR (1) FR2170409A5 (enrdf_load_stackoverflow)
GB (1) GB1367578A (enrdf_load_stackoverflow)
NL (1) NL7215711A (enrdf_load_stackoverflow)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172254A (en) * 1978-02-13 1979-10-23 The Columbus Show Case Company Merchandise case with door lock alarm
US4935587A (en) * 1987-07-09 1990-06-19 Hannibal Pattermann Device for actuating a warning device in combination with a lock for a door, window or the like
US5062668A (en) * 1989-04-13 1991-11-05 Ellenberger & Poensgen Gmbh Safety lock for the doors of electrical applicances
EP0501218A3 (en) * 1991-02-26 1993-06-02 Elge Elektronik-Geraetewerk Gmbh. & Co. Control system for locking a door or a protective hood of a safety device for machines
US6082787A (en) * 1997-12-22 2000-07-04 Bitron S.P.A. Locking and unlocking device of the door of a domestic electrical appliance
US6145898A (en) * 1997-04-30 2000-11-14 Ellenberger & Poensgen Gmbh Door locking device for electric apparatus
WO2003057973A1 (en) * 2002-01-09 2003-07-17 Lg Electronics Inc. A door assembly and a washing machine and a dryer using the same
US6634684B2 (en) * 2000-08-07 2003-10-21 Elektromanufaktur Zangenstein Hanauer Gmbh & Co. Kgaa Latching mechanism for the door of an electric household appliance
US20040083769A1 (en) * 2002-01-09 2004-05-06 Kim Jong Seok Door assembly and a washing machine and a dryer using the same
CN1316107C (zh) * 2002-07-05 2007-05-16 乐金电子(天津)电器有限公司 滚筒式洗衣机用门锁开关组合的门被锁状态下的滑座固定装置
US20080100066A1 (en) * 2006-10-28 2008-05-01 Marquardt Gmbh Lock for a household appliance
US20080106105A1 (en) * 2004-12-16 2008-05-08 Georg Spiessl Door Lock For The Door Of A Household Appliance
US20080238113A1 (en) * 2007-03-26 2008-10-02 Onofrio Ricchitelli Locking device for the closing lid of washing machines
US20100038217A1 (en) * 2007-03-15 2010-02-18 Kai Bretschneider Device for maintaining a locked and closed state of a space-separating device in a releasable manner
US20100181783A1 (en) * 2007-06-29 2010-07-22 Itw Metalflex, Druzba Za Proizvodnjo Delov Za Gospodinjske Aparate, D.O.O. Electromagnetic blocking device for the door of an electric household applicance, in particular the door of a washing machine
US20110133490A1 (en) * 2008-09-03 2011-06-09 Itw Metalflex, D.O.O. Tolmin Safety lock for a door of a household appliance, preferably of a washing machine
CN101666028B (zh) * 2008-09-02 2012-11-14 罗尔德电工技术有限责任公司 用于洗衣机的封闭盖的锁定装置
US20140035294A1 (en) * 2011-03-15 2014-02-06 BRITON S.p.A. Door lock device with an opening button
ITRM20130017A1 (it) * 2013-01-10 2014-07-11 Bitron Spa Dispositivo blocco-porta ad attivazione magnetica.
US20150000195A1 (en) * 2013-06-26 2015-01-01 Samsung Electronics Co., Ltd. Apparatus to detect opening and closing of door in washing machine
US10892123B2 (en) * 2016-09-26 2021-01-12 Pizzato Elettrica S.R.L. Safety switch with detection of the driving of an auxiliary unlocking control

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IT971090B (it) * 1972-11-22 1974-04-30 Ire Spa Dispositivo di protezione di parti colari elettronici nelle lavatrici con motore a corrente continua
GB1513823A (en) * 1975-03-12 1978-06-14 Unimax Switch Ltd Safety device for guarded machinery
DE2810667C2 (de) * 1978-03-11 1982-07-29 Ellenberger & Poensgen Gmbh, 8503 Altdorf Türverriegelungsvorrichtung für elektrische Geräte
DE2833860A1 (de) * 1978-08-02 1980-02-21 Ellenberger & Poensgen Bistabile verriegelungsvorrichtung fuer waschmaschinentueren
IT8153659U1 (it) * 1981-10-05 1983-04-05 Indesit Ind Elettrodomestici Italiana S P A Dispositivo di apertura dello sportello di una lavastoviglie.
DE3430414A1 (de) * 1984-08-18 1986-02-27 Ellenberger & Poensgen Gmbh, 8503 Altdorf Tuerverriegelungsvorrichtung mit sofortverriegelung und verzoegerter entriegelung mit wasserstandsueberwachung
DE3534856A1 (de) * 1985-09-30 1987-04-02 Eltek Spa Elektrohydraulische einrichtung zum zeitweiligen verriegeln und zum "verzoegerten" oeffnen der einfuell- und entleerungstuer einer waschmaschine
GB2331122B (en) * 1995-01-25 1999-08-18 Code Inc U Electronic input and dial entry lock
CZ20021787A3 (cs) * 2002-05-22 2003-12-17 Radomír Bednář Zámek
DE102006058322B4 (de) * 2006-12-11 2012-05-31 Emz-Hanauer Gmbh & Co. Kgaa Türschließvorrichtung, insbesondere für eine Wasch- oder Spülmaschine oder dergleichen Haushaltsgerät
PL2154287T3 (pl) * 2008-08-12 2012-03-30 Elettrotecnica Rold Srl Urządzenie blokujące do pokrywy zamykającej pralek
ITRM20110342A1 (it) * 2011-06-28 2012-12-29 Bitron Spa Dispositivo di emergenza per un elettrodomestico.
US11272826B2 (en) * 2017-06-23 2022-03-15 Illinois Tool Works Inc. Appliance door latch system with pre-latching catch alignment system

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Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172254A (en) * 1978-02-13 1979-10-23 The Columbus Show Case Company Merchandise case with door lock alarm
US4935587A (en) * 1987-07-09 1990-06-19 Hannibal Pattermann Device for actuating a warning device in combination with a lock for a door, window or the like
US5062668A (en) * 1989-04-13 1991-11-05 Ellenberger & Poensgen Gmbh Safety lock for the doors of electrical applicances
EP0501218A3 (en) * 1991-02-26 1993-06-02 Elge Elektronik-Geraetewerk Gmbh. & Co. Control system for locking a door or a protective hood of a safety device for machines
US6145898A (en) * 1997-04-30 2000-11-14 Ellenberger & Poensgen Gmbh Door locking device for electric apparatus
US6082787A (en) * 1997-12-22 2000-07-04 Bitron S.P.A. Locking and unlocking device of the door of a domestic electrical appliance
US6634684B2 (en) * 2000-08-07 2003-10-21 Elektromanufaktur Zangenstein Hanauer Gmbh & Co. Kgaa Latching mechanism for the door of an electric household appliance
US20040083769A1 (en) * 2002-01-09 2004-05-06 Kim Jong Seok Door assembly and a washing machine and a dryer using the same
AU2003235779B2 (en) * 2002-01-09 2005-05-26 Lg Electronics Inc. A door assembly and a washing machine and a dryer using the same
CN1317444C (zh) * 2002-01-09 2007-05-23 Lg电子株式会社 门组件以及使用这种门组件的洗衣机
WO2003057973A1 (en) * 2002-01-09 2003-07-17 Lg Electronics Inc. A door assembly and a washing machine and a dryer using the same
CN1316107C (zh) * 2002-07-05 2007-05-16 乐金电子(天津)电器有限公司 滚筒式洗衣机用门锁开关组合的门被锁状态下的滑座固定装置
US20080106105A1 (en) * 2004-12-16 2008-05-08 Georg Spiessl Door Lock For The Door Of A Household Appliance
US8991877B2 (en) 2004-12-16 2015-03-31 Emz-Hanauer Gmbh & Co. Kgaa Door lock for the door of a household appliance
US8246089B2 (en) * 2006-10-28 2012-08-21 Marquardt Gmbh Lock for a household appliance
US20080100066A1 (en) * 2006-10-28 2008-05-01 Marquardt Gmbh Lock for a household appliance
US20100038217A1 (en) * 2007-03-15 2010-02-18 Kai Bretschneider Device for maintaining a locked and closed state of a space-separating device in a releasable manner
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Also Published As

Publication number Publication date
NL7215711A (enrdf_load_stackoverflow) 1973-05-29
GB1367578A (en) 1974-09-18
DE2257587A1 (de) 1973-05-30
BE791863A (fr) 1973-03-16
FR2170409A5 (enrdf_load_stackoverflow) 1973-09-14
AT326599B (de) 1975-12-29
ATA988172A (de) 1975-03-15
CH550356A (it) 1974-06-14
DE2257587C2 (de) 1983-05-11

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