US3823294A - Door locking system for an electrical apparatus - Google Patents

Door locking system for an electrical apparatus Download PDF

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Publication number
US3823294A
US3823294A US00176658A US17665871A US3823294A US 3823294 A US3823294 A US 3823294A US 00176658 A US00176658 A US 00176658A US 17665871 A US17665871 A US 17665871A US 3823294 A US3823294 A US 3823294A
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US
United States
Prior art keywords
door
switch
switching means
drive coil
operated
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.)
Expired - Lifetime
Application number
US00176658A
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English (en)
Inventor
T Takayama
A Tanita
S Hoshina
T Ohtaguro
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.)
Aerojet Rocketdyne Holdings Inc
Original Assignee
Gencorp Inc
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Filing date
Publication date
Application filed by Gencorp Inc filed Critical Gencorp Inc
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Publication of US3823294A publication Critical patent/US3823294A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6414—Aspects relating to the door of the microwave heating apparatus
    • H05B6/6417—Door interlocks of the microwave heating apparatus and related circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/02—Doors specially adapted for stoves or ranges
    • F24C15/022—Latches

Definitions

  • One of the switching means 1 is manually operable for controlling an electromag [58] d 126/l97 netic drive coil that is connected with power supply He o are 317/43 through said one switching means.
  • Lock means acting upon a door is operated by the drive coil.
  • the other switching means is operated by the operation of the [56] References Cited lock means I UNITED STATES PATENTS 3,335,656 8/1967 Smith 219/1055 X 6 Claims, 6 Drawing figures PATENTED 91574 3,823,294
  • the invention relates to a door locking system for an electrical apparatus, in particular, a microwave oven, and more particularly, to an automatic door locking system which is electromagnetically controlled by the electrical circuit of such apparatus.
  • the door-interlocked switching means mentioned above may have its contacts closed if an extremely small obstacle existed, so that it may cause an initiation of the operation of the oven without an effective seal for electromagnetic energy which commonly comprises metal contact between the door andthe enclosure.
  • a door locking system which can be controlled to maintain a predetermined relationship between the open or closed condition of the door and the open or'closed condition of an electrical circuit of: the apparatus, either power supply or control circuit, the condition of which has an important influence upon the door opening or closing.
  • Such a change in the condition of the electrical circuit may be caused by an automatic switch which resets upon achievement of the intended function of the apparatus, for example, by the contacts of a cooking timer-of a microwave oven.
  • an automatic switch which resets upon achievement of the intended function of the apparatus, for example, by the contacts of a cooking timer-of a microwave oven.
  • the door locking system of the invention is most advantageously applied to a microwave oven, it can also be applied to a radioactivity apparatus having a similar enclosure as microwave unit or other more conventional electrical apparatus.
  • the system When the system is applied to a microwave oven, it assures that the microwave generator circuit of the oven cannot be closed until its door is completely closed and locked, thereby preventing an undesirable situation that the oven interior happens to be supplied with electromagnetic energy while a gap is left by an obstacle held between the door and the enclosure. Since the door cannot be opened so long as the oven interior is supplied with microwave energy, careless opening by a user to cause him a serious damage cannot occur.
  • an emergency switch in the form of a door lock release switch may be provided to assure interruption of the microwave generator circuit before the door is actually opened.
  • FIG. 1 is a schematic circuit diagram of the door locking system of the invention in its simplest form
  • FIG. 2 is a circuit diagram of a modification of the embodiment shown in FIG. 1,
  • FIG. 3 is a circuit diagram of a practical application of the door locking system shown in FIG. l to a microwave oven
  • FIG. 4 is acircuit diagram of a practical application of the door locking system shown in FIG. 2 to a micro-
  • FIG. is an elevational view, partly in section, of a door lock structure constructed in accordance with the invention.
  • FIG. 6 is an elevational view, partly in section, of another embodiment of the door lock structure of the invention, certain parts in unlocked position being shown in chain lines.
  • the system comprises a solenoid operated switch or contactor 1 having contacts la and lb connected in the lines L1, L2 of a selected electrical circuit or main circuit of an electrical apparatus to which the system is applied.
  • the energizing circuit for the operating coil or solenoid 1c of the contactor I is connected across the lines L1, L2 on the supply side of the contacts la and 1b, and includes first and second switching means 2, 3 connected in series.
  • An electromagnetic drive coil 4 is connected across the lines L1, L2 through the first switching means.
  • the first switching means is operated either automatically or manually in response to an external condition.
  • the second switching means 3 is adapted to be operated when lock means (not shown in FIG.
  • the second switching means 3 will be closed when the drive coil 4 is energized by closing the first switching means, and when both the first and second switching means are closed, the solenoid 1c of the contactor 1 is excited to cause the contacts la and 1b to close the main circuit.
  • the second switching means 3 cannot be opened unless the drive coil 4 isdeenergized, but the drive coil 4 can be deenergized by opening the first switching means. Opening of the first switching means 2' deenergizes the solenoid 1c of the solenoid-operated contactor l to open its contacts 1a and 1b.
  • the lock means acting on the door is arranged to be operated by the drive coil 4 so that when the door is locked, the lines L1, L2 are closed and the door lock remains unreleased as long as the these lines are interrupted by contacts 1a and lb.
  • FIG. 2 differs from the embodiment of FIG. 1 in that one end of the solenoid 1c is connected to the line L1 on the opposite side of the contact lb.
  • the solenoid 1c is connected in series with the second switching means 3 across the drive coil 4 which is connected across the lines L1, L2 through the first switching means 2.
  • the embodiment of FIG. 2 operates in a similar manner as that of FIG. I.
  • FIGS. 3 and 4 show electrical circuit connections of practical microwave circuits incorporating the door locking systems shown in FIGS. 1 and 2, respectively.
  • corresponding parts are designated by like reference numerals as in FIGS. 1 and 2, though certain parts may be called differently.
  • a microwave oscillator circuit is of primary concern in opening or closing the door of a microwave oven.
  • a magnetron is used to provide microwave oscillation and its operation is started or stopped by closing or opening the lines supplying the primary side of a high tension transformer having its secondary side connected to feed the magnetron.
  • the lines L1 and L2 are connected with a load 5 which represents a high tension transformer or its primary coil.
  • Conventional microwave ovens also included in the primary circuit of its high tension transformer a number of switching means such as door-interlocked switching means initially referred to, contacts of a timer for controlling the cooking time, cooking start switch, emergency stop switch, thermal switch for protecting the high tension transformer or the like.
  • a suitable one of these conventional switches or switching means is chosen as the first switching means 2 described above in connection with FIGS. 1 and 2.
  • the contacts of a cooking timer are chosen for this purpose in view of the desirability of releasing the door lock automatically upon completion of the cooking. For the purpose of subsequent description, such timer contacts will be used as the first switching means 2.
  • the energizing circuit for the solenoid 1c of the contactor 1 includes the timer contacts 2, door lock interlocked switch 3 which constitutes the second switching means, and a thermal switch 6 for protecting the high tension transformer, all connected in series.
  • a timer 7 is connected across the lines L1, L2 through the thermal switch 6. Across the timer contacts 7 is connected an electromagnetic drive coil 4 in series with the timer contacts 2, a cooking start switch 8 and an emergency stop switch 9.
  • a magnetron cooling fan motor 10 is connected directly across the lines L1, L2, and a stirrer fan motor 11 is connected across the lines L1, L2 through the door lock interlocked switch 3, timer contacts 2, thermal switch 6 and an emergency stop switch 9.
  • the emergency stop switch 9 has normally closed contacts while the cooking start switch 8, and a self-holding circuit is formed for the drive coil 4 which extends through the door lock interlocked switch 3, and contacts 1d associated with the contactor 1 to the junction between the start switch 8 and the drive coil 4.
  • Such self-holding circuit will be used also when either switch 8 or9 comprises a push-button switch.
  • the embodiment shown further includes a power switch 12 connected in the lines L1, L2 as well as a door interlocked switch 13 connected in the line Ll on the load side of the contacts 1a of the contactor 1.
  • FIG. 4 shows an embodiment which is generally similar tothat shown in FIG. 3 but incorporating the system illustrated in FIG. 2.
  • This embodiment differs from that shown in FIG. 3 in that the energizing circuit for the solenoid 10 of the contactor 1 is formed across the lines L1, L2 on opposite sides of the contactor l, and that the cooking start switch 8 and the emergency stop switch 9 are located differently. Again the emergency stop switch 9 is normally closed while the cooking start switch is normally open. There is no need of providing a self-holding circuit for the drive coil 4 since it is selfheld when the contacts 1b are closed.
  • the door interlocked switch 13 is shown connected in the energizing circuit for the solenoid 10, but it may be connected as shown in FIG. 3.
  • a microwave oven incorporating the invention operates in substantially the same manner for both embodiments of FIGS. 3 and 4.
  • the power switch 12 When the power switch 12 is closed, the fan motor 10 for cooling the magnetron is started. Then the door is operated, and when a cooking time is established on the timer 7, its associated contacts 2 are closed. Normally, the thermal switch 6 and the emergency stop switch 9 are remain closed, and the door interlocked switch 13 is closed in response to the closing of the door.
  • the drive coil 4 becomes energized to drive a lock means associated with the door.
  • the lock means is only operative upon the door which is completely closed.
  • the door lock interlocked switch 3 When the-lock means has functioned properly, the door lock interlocked switch 3 is closed, thereby starting the stirrer fan motor and energizing the solenoid To to close the contacts la and lb as well as contacts lld. If a small gap is left between the door and the enclosure of the oven due to the presence of an obstacle, the door interlocked switch 13 may or may not be closed, but the door lock interlocked switch 3 remains open, thereby preventing to start the operation of the oeven. It will be noted when the cooking start push-button switch 8 which is normally open returns to its normal position, the drive coil 4 is already self-held. During the operation of the microwave oven, the door lock means which is held in position by'the drivecoil 4 prevents free opening or closing of the door.
  • FIG. 5 A simple example of a door lock structure which is constructed in accordance with the invention is shown in FIG. 5.
  • the structure is mounted on the body 24) of an electrical apparatus which cooperates with an associated door 21.
  • the structure includes a lock pin 22 which is secured to a core 23 that is adapted to be drivenelectromagnetically by the drive coil or solenoid 4.
  • the pin 22 is normally urged away from the door 2ll by a spring 24 which acts on the core 23, but moves together with the core 23, into fitting engagement with a lock groove 25 formed in the door 211 against the resilience of the spring 24 when the drive coil 4 is energizecl.
  • the dimensions and positions of the lock pin 22 and groove 25 are chosensuch that a door lock is achieved only when the door is completely closed.
  • a switch 3 is provided on the body 20 so as 'to be closed when a door lock is achieved.
  • the switch 3 comprises a lever 26 secured at one end on the switch casing and abutting at its other end against the core 23 so that when the latter is driven by the drive coil 4, the lever 26 is flexed thereby to cause a movement of a knob 27 which is mechanically coupled with a switch mechanism.
  • leads and associated switch means which carry current to the drive current are not shown in this Figure, it will be apparent that they can be mounted in any suitable manner without changing the structure shown.
  • FIG. 6 shows another door lock structure which uses an electromagnetically driven latch 28 to substitute for the lock pin 22 of FIG. 5.
  • the latch 28 comprises a rotatable member pivoted at 29 and has a hook 36 formed at its one end.
  • the other end of the latch 23 is formed as a lever 31.
  • a door 21 is formed with a recess 32 which is adapted to receive the hook therein to lock the door when the door 211 is completely closed. While not shown, the door 211 is hinged at its bottom to the body 26 and is movable in the direction shown by an arrow by operating a handle 33 formed on the upper part of its front wall.
  • a pair of counter-acting springs 34 and 35 have their one end connected spaced points on the lever 31.
  • the other end of the spring 34 is secured to core 23 which provides a driving action when the coil 4 is excited, while the other end of the spring 35 is anchored to a suitable position on the body 20.
  • the neutral position of the lever 31 it assumes a position indicated by chain lines, thus keeping the hook 30 away from the recess 32.
  • the core 23 is driven upward to rotate the lever 31 counterclockwise, thereby causing the hook 30 to engage the recess 32, whereby a door lock is achieved.
  • the door lock is maintained unlessthe drive coil 4 is deenergized. If the door is incompletely closed before the coil 4 is energized, the hook 30 will move against the edge wall around the recess upon energization of the coil 4, so that the latch 23 will not rotate.
  • a door-lock interlocked switch 3 is provided so as to operate when a door lock is achieved by normal rotation of the latch 28.
  • a projection 36 is formed on and along one side of the lever member 311 and is adapted to engage a knob 27 associated with the switch mechanism of the switch 3'as the latch 28 rotates. However, the arrangement is such that the projection 36 does not cause the contacts of the switch 3 to be closed unless the hook 34 engages the recess 32. In the neutral position of the latch 26 indicated in chain lines, the projection 36 is clear of the knob 27.
  • Another switch 9 is mounted in juxtaposition with the switch 3 and has a knob 37 that is actuated by a ,push bar 33 which extends externally of the body 20 and is provided with an operating botton 39.
  • a return spring 40 is associated with the push bar 36 to hold it normally in a neutral position in which the push bar is clear of the knob 37.
  • the switch mechanism of the switch 3 may be constructed as a normally-closed switch which can be opened in response to operation of the button 39, thus allowing it to be used as an emergency stop switch or a door lock release switch. It will be noted that leads and switch means to carry current to the drive coil 4 can be suitably positioned within the body without changing the construction shown.
  • Door locking system for a microwave oven comprising a solenoid operated switch having its contacts connected in the primary circuit of a high tension transformer, first and second switching means connected in the energizing circuit for the solenoid of the switch, an electromagnetic drive coil connected with a power supply through the first switching means, and lock means responsive to the energization of the drive coil for locking the door'of the oven after said door is closed, said switch and the drive coil, said self-holding contact being included in the solenoid operated switch.
  • Door locking system for a microwave oven according to claim 1, further including a cooking start switch having a normally open contact connected with the drive coil on a remote side from the timer contacts, the junction between the cooking start switch and the drive coil being connected with a contact of the solenoid operated switch which is situated on the load side thereof.
  • the lock means comprises a core driven by the '8 drive coil, latch means connected with the core, means receiving the latch means to lock it, said latch means and receiving means being separately provided on the electrical apparatus and the door.
  • Door locking system for a microwave oven comprising a solenoid operated switch having its contacts connected in the primary circuit of a high tension transformer, first and second switching means connected in the energizing circuit for the solenoid of said switch, an electromagnetic drive coil connected to a power supply through said first switching means, and locking means responsive to the energization of the drive coil for locking the door of the oven after said door is closed, said first switching means being manually operated, and said second switching means being operated by the lock means when the latter is operated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
US00176658A 1970-08-31 1971-08-31 Door locking system for an electrical apparatus Expired - Lifetime US3823294A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7615070 1970-08-31
JP8646870 1970-10-01

Publications (1)

Publication Number Publication Date
US3823294A true US3823294A (en) 1974-07-09

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US00176658A Expired - Lifetime US3823294A (en) 1970-08-31 1971-08-31 Door locking system for an electrical apparatus

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US (1) US3823294A (enrdf_load_stackoverflow)
CA (1) CA953392A (enrdf_load_stackoverflow)
DE (1) DE2143412C3 (enrdf_load_stackoverflow)
FR (1) FR2106233A5 (enrdf_load_stackoverflow)
GB (1) GB1352535A (enrdf_load_stackoverflow)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967088A (en) * 1973-12-14 1976-06-29 Matsushita Electric Industrial Co., Ltd. Gap detector for microwave oven
US4006121A (en) * 1973-06-27 1977-02-01 Matsushita Electric Industrial Co., Ltd. Door latch mechanism controlling switch in microwave oven or the like
JPS5310154A (en) * 1976-07-16 1978-01-30 Matsushita Electric Ind Co Ltd High frequency heater
US4101750A (en) * 1977-05-31 1978-07-18 Whirlpool Corporation Door interlock system for microwave oven
DE2849803A1 (de) * 1977-11-16 1979-05-17 Sharp Kk Tuerverriegelung fuer einen mikrowellenherd
US4219716A (en) * 1978-04-26 1980-08-26 Dca Food Industries, Inc. Bottom entry oven
US4303819A (en) * 1978-04-26 1981-12-01 Dca Food Industries, Inc. Bottom entry oven
US4345144A (en) * 1980-01-21 1982-08-17 Harper-Wyman Company Safety latch control arrangement for self-cleaning oven
US4450335A (en) * 1981-02-02 1984-05-22 Matsushita Electric Industrial Co., Ltd. Door opening apparatus for heating appliance
US4638137A (en) * 1980-09-22 1987-01-20 Matsushita Electric Industrial Co., Ltd. Heating appliance having a fail-safe start switch
US5004276A (en) * 1990-01-22 1991-04-02 The Stanley Works Push to close latch for self-cleaning oven
US5072974A (en) * 1991-02-07 1991-12-17 The Stanley Works Push to close latch for self-cleaning oven
US6060700A (en) * 1996-06-03 2000-05-09 Daniel Perlman Microwave oven with removable storage cassette in dashboard of motor vehicle
EP0917404A3 (en) * 1997-11-15 2000-05-31 Lg Electronics Inc. An opening and closing apparatus for door of microwave oven with lighting lamps
US6474702B1 (en) 2000-08-16 2002-11-05 France/Scott Fetzer Company Range door lock with nuisance latch
USD471572S1 (en) 2002-03-14 2003-03-11 Binney & Smith Inc. Crayon maker
US6552314B2 (en) * 2000-04-20 2003-04-22 Fujimak Corporation Normal position detecting and latching mechanism of a functional component in a heating apparatus
US20030107152A1 (en) * 2001-12-07 2003-06-12 Binney & Smith Inc. Crayon maker
US7009147B1 (en) 2005-01-12 2006-03-07 Maytag Corporation Operational modes for a cooking appliance employing combination cooking technology
US20070241568A1 (en) * 2004-12-20 2007-10-18 Ellenberger & Poensgen Gmbh Door lock for an oven
GB2439324A (en) * 2006-06-22 2007-12-27 Panasonic Mfg Uk Ltd Domestic appliance with electromechanically actuated door retention mechanism
US20110290791A1 (en) * 2009-02-06 2011-12-01 Panasonic Corporation High-frequency heating device
US20130008895A1 (en) * 2011-07-06 2013-01-10 General Electric Company Double line break
US20160116171A1 (en) * 2014-10-22 2016-04-28 General Electric Company Oven airflow control
WO2020043438A3 (de) * 2018-08-27 2020-04-23 BSH Hausgeräte GmbH Haushalts-mikrowellengerät
CN114352132A (zh) * 2021-12-01 2022-04-15 锐达互动科技股份有限公司 一种电磁锁控制电路及控制方法
US11365559B2 (en) * 2018-01-29 2022-06-21 Panasonic Appliances Microwave Oven (Shanghai) China Co., Ltd. Locking mechanism and door opening control method

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU531479B2 (en) * 1978-12-11 1983-08-25 Sharp K.K. Door latching assembly
FR2449849A1 (fr) * 1979-02-23 1980-09-19 Pruines Iseco De Systeme de securite pour porte de four a micro-ondes
DE3817075C2 (de) * 1988-05-19 1996-09-26 Miele & Cie Tür-Sicherheitsschalter für ein Haushaltgerät
DE4040424A1 (de) * 1990-12-18 1992-06-25 Miele & Cie Mikrowellenherd mit einer tuer
DE19504574C2 (de) * 1995-02-11 2002-05-02 Miele & Cie Backofen mit einer Türverriegelungseinrichtung bei Mikrowellenbetrieb
DE102005022930A1 (de) * 2005-05-15 2006-11-16 Gunter Kries Kontaktzustandsabhängiges Verriegelungssystem
ITBO20080556A1 (it) * 2008-09-12 2010-03-13 Premark Feg Llc Forno industriale a cottura combinata

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006121A (en) * 1973-06-27 1977-02-01 Matsushita Electric Industrial Co., Ltd. Door latch mechanism controlling switch in microwave oven or the like
US3967088A (en) * 1973-12-14 1976-06-29 Matsushita Electric Industrial Co., Ltd. Gap detector for microwave oven
JPS5310154A (en) * 1976-07-16 1978-01-30 Matsushita Electric Ind Co Ltd High frequency heater
US4101750A (en) * 1977-05-31 1978-07-18 Whirlpool Corporation Door interlock system for microwave oven
DE2849803A1 (de) * 1977-11-16 1979-05-17 Sharp Kk Tuerverriegelung fuer einen mikrowellenherd
US4219716A (en) * 1978-04-26 1980-08-26 Dca Food Industries, Inc. Bottom entry oven
US4303819A (en) * 1978-04-26 1981-12-01 Dca Food Industries, Inc. Bottom entry oven
US4345144A (en) * 1980-01-21 1982-08-17 Harper-Wyman Company Safety latch control arrangement for self-cleaning oven
US4638137A (en) * 1980-09-22 1987-01-20 Matsushita Electric Industrial Co., Ltd. Heating appliance having a fail-safe start switch
US4450335A (en) * 1981-02-02 1984-05-22 Matsushita Electric Industrial Co., Ltd. Door opening apparatus for heating appliance
US5004276A (en) * 1990-01-22 1991-04-02 The Stanley Works Push to close latch for self-cleaning oven
US5072974A (en) * 1991-02-07 1991-12-17 The Stanley Works Push to close latch for self-cleaning oven
US6060700A (en) * 1996-06-03 2000-05-09 Daniel Perlman Microwave oven with removable storage cassette in dashboard of motor vehicle
EP0917404A3 (en) * 1997-11-15 2000-05-31 Lg Electronics Inc. An opening and closing apparatus for door of microwave oven with lighting lamps
US6552314B2 (en) * 2000-04-20 2003-04-22 Fujimak Corporation Normal position detecting and latching mechanism of a functional component in a heating apparatus
US6474702B1 (en) 2000-08-16 2002-11-05 France/Scott Fetzer Company Range door lock with nuisance latch
US6902387B2 (en) 2001-12-07 2005-06-07 Binney & Smith Inc. Crayon maker
US20050189680A1 (en) * 2001-12-07 2005-09-01 Binney & Smith Inc. Crayon maker
US7182902B2 (en) 2001-12-07 2007-02-27 Binney & Smith Inc. Crayon marker
US20030107152A1 (en) * 2001-12-07 2003-06-12 Binney & Smith Inc. Crayon maker
USD471572S1 (en) 2002-03-14 2003-03-11 Binney & Smith Inc. Crayon maker
US7481469B2 (en) * 2004-12-20 2009-01-27 Ellenberger & Poensgen Gmbh Door lock for an oven
US20070241568A1 (en) * 2004-12-20 2007-10-18 Ellenberger & Poensgen Gmbh Door lock for an oven
US7009147B1 (en) 2005-01-12 2006-03-07 Maytag Corporation Operational modes for a cooking appliance employing combination cooking technology
US20110139772A1 (en) * 2006-06-22 2011-06-16 Panasonic Manufacturing Uk Ltd Domestic Appliance with Controlled Door Opening
GB2439324A (en) * 2006-06-22 2007-12-27 Panasonic Mfg Uk Ltd Domestic appliance with electromechanically actuated door retention mechanism
GB2439324B (en) * 2006-06-22 2011-12-28 Panasonic Mfg Uk Ltd Domestic appliance with controlled door opening
US9832820B2 (en) * 2006-06-22 2017-11-28 Panasonic Manufacturing U.K. Ltd. Domestic appliance with controlled door opening
US20110290791A1 (en) * 2009-02-06 2011-12-01 Panasonic Corporation High-frequency heating device
US20130008895A1 (en) * 2011-07-06 2013-01-10 General Electric Company Double line break
US20160116171A1 (en) * 2014-10-22 2016-04-28 General Electric Company Oven airflow control
US11365559B2 (en) * 2018-01-29 2022-06-21 Panasonic Appliances Microwave Oven (Shanghai) China Co., Ltd. Locking mechanism and door opening control method
WO2020043438A3 (de) * 2018-08-27 2020-04-23 BSH Hausgeräte GmbH Haushalts-mikrowellengerät
GB2591656A (en) * 2018-08-27 2021-08-04 Bsh Hausgeraete Gmbh Household microwave device
GB2591656B (en) * 2018-08-27 2022-07-06 Bsh Hausgeraete Gmbh Domestic microwave appliance
CN114352132A (zh) * 2021-12-01 2022-04-15 锐达互动科技股份有限公司 一种电磁锁控制电路及控制方法

Also Published As

Publication number Publication date
CA953392A (en) 1974-08-20
GB1352535A (en) 1974-05-08
DE2143412B2 (de) 1974-06-12
DE2143412A1 (de) 1972-03-09
FR2106233A5 (enrdf_load_stackoverflow) 1972-04-28
DE2143412C3 (de) 1975-01-30

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