US3733456A - Microwave oven door latch - Google Patents

Microwave oven door latch Download PDF

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Publication number
US3733456A
US3733456A US00178044A US3733456DA US3733456A US 3733456 A US3733456 A US 3733456A US 00178044 A US00178044 A US 00178044A US 3733456D A US3733456D A US 3733456DA US 3733456 A US3733456 A US 3733456A
Authority
US
United States
Prior art keywords
door
latch
pawl
actuated
enclosure
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
US00178044A
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English (en)
Inventor
L Blackburn
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.)
Goodman Co LP
Original Assignee
Amana Refrigeration Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Amana Refrigeration Inc filed Critical Amana Refrigeration Inc
Application granted granted Critical
Publication of US3733456A publication Critical patent/US3733456A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/08—Bolts
    • Y10T292/0911—Hooked end
    • Y10T292/0936—Spring retracted
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/08—Bolts
    • Y10T292/1043—Swinging
    • Y10T292/1075—Operating means
    • Y10T292/1082—Motor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/175—Bolt releasers
    • Y10T292/18—Free-end-engaging means

Definitions

  • ABSTRACT An electrically actuated arrangement for securing the door of a microwave oven apparatus while the energy is radiating within the enclosure.
  • the door can only be opened by the user after the heating source has been de-energized.
  • Mechanical latching structures are eliminated and the novel door latch is adaptable to either the side-mounted swinging oven door as well as the drop down model.
  • Microwave ovens have found wide acceptance in the home market for the preparation of a wide variety of foods in extremely fast cooking times. Such apparatus has also found acceptance in the vending machines where complete meals can be prepared in a very short time.
  • An energy generator for radiating microwaves within the oven enclosure is the magnetron oscillator used in World War II radar systems. Conventionally, such oven apparatus operates at assigned frequencies of 915 to 2450 Megahertz as determined by the FCC regulatory agency.
  • the term microwave as used in the specification is defined as electromagnetic energy radiation in that portion of the spectrum having wavelengths in the order of approximately 1 meter to one millimeter in frequencies in excess of 300 Megahertz.
  • a door locking arrangement is also desirable to render the microwave oven apparatus completely safe, particularly when used by an inexperienced operator or, accidentally, by small children.
  • an electrically actuated oven door latch having means for engaging the lever arm of a latch interlock switch.
  • a door interlock switch is coupled in series with the latch interlock and is adapted to operate in conjunction with the movement of the oven door hinge. Both interlock switches must be in the closed position in order for the energy generator to operate.
  • the latching arrangement is positively locked by spring lever bar means which are directly engaged by a solenoid operated movable pawl arrangement in a sweeping movement to lock the latch after the interlock switch lever bar has been depressed and thereby prevent opening of the door while the energy generator is operative.
  • the circuit for the energizing of the electromagnetically controlled solenoid means includes the inner connection of the oven start switch together with the door interlocks.
  • the unlocking of the disclosed door latching arrangements results only upon the de-energizing of the microwave generator.
  • FIG. 1 is an enlarged perspective view of the electrically actuated door latch arrangement embodying the present invention
  • FIG. 2 is an enlarged perspective view of an alternative embodiment of the present invention.
  • FIG. 3 is a perspective view of a microwave oven apparatus with a drop down door and prior art mechanical lock
  • FIG. 4 is a perspective view of the prior art mechanical locking structure as viewed from behind the control panel of the apparatus looking outwardly with the lock in the closed position;
  • FIG. 5 is a perspective view of a microwave oven apparatus having a side-hinged door arrangement
  • FIG. 6 is a schematic circuit diagram of an exemplary microwave oven apparatus utilizing the embodiment of the present invention.
  • the microwave oven apparatus 10 comprises a hollow oven heating enclosure 12 defined by conductive walls 14. Casing 16 surrounds the oven enclosure as well as the high voltage electrical circuit means and oven controls. Access to the interior of the enclosure 12 is provided by means of an opening 18 suitably closed by a metallic door assembly 20. In this embodiment a bottom hinge 22 is provided and the upward and downward movement of the door is controlled by a pair of spring tension counter balanced arms 24 together with a handle (not shown). The arms 24 contact door interlock switch means having a lever actuating arm which are housed adjacent to walls 14 and have not been illustrated for the sake of clarity.
  • the door assembly 20 in this embodiment is shown as being recessed so as to be flushed-mounted.
  • door comprises a panel member 26 having a plurality of perforations 28 which aid in the prevention of the escape of any electromagnetic energy radiation during operation of the oven apparatus.
  • Ring member 30 is joined to panel member 26 with the overall door assembly having a stepped configuration and wall 30a contacts wall 32 of the surrounding access opening 18 when the door is in closed position.
  • a hook-type latch 34 is pivotally mounted on ring member 30 and is supported by wall portion 30a.
  • a mating slot 36 in wall 32 is adapted to receive latch 34 when the door 20 is in the closed position.
  • a mechanical latch locking arrangement 38 is slidably disposed and supported by the escutcheon control panel 40.
  • the latch lock is actuated by means of a slide control member 42 disposed within opening 44.
  • Panel 40 also supports a 5-minute timer switch 46 as well as a 30-minute timer switch 48.
  • a start control button 50, stop control button 52 and light control button 54 are mounted on the panel 40.
  • FIG. 4 the reverse side of the panel member 40 is shown.
  • Another slide member 56 to which the control 42 is affixed by screw means 58 provides for movement of bar lock member 60 which moves the tongue 62 to a position engaging the top of the latch 34 when it is positioned within the slot 36.
  • FIG. illustrates a microwave oven apparatus 64 with an access opening 66 enclosed by means of a sidemounted door assembly 68 having a pivotally disposed latch member 70.
  • control panel 72 supports a mechanical latch lock 74 which slidably moves a bar member 74 to engage slot 76 in sidewall 78 ofthe door assembly.
  • the latch interlock switch is supported by plate 80 shown mounted to a casing wall 82. Inner wall 86 defines the oven enclosure.
  • Door assembly 68 is recessed and closes the opening 66 with the latch 70 supported by means of a pivot 84 extending through sidewall 78.
  • a bezel member 88 frames the wall portions of casing 82 adjacent the door assembly 68.
  • Interlock switch 90 is provided with an operating lever arm 92. Upon the introduction of latch 70 within the slot 94 in wall 96, the lever arm 92 is depressed by the hook portion 98 to actuate this component of the main circuit which in combination with other interlock means operates the energy generator.
  • lever arm 92 is of a resilient material so that it is biased away from the switch 90 in the open position.
  • An electromagnetically actuated solenoid member 100 is provided with a reciprocally movable arm 102 supporting adjacent to its outer end a pawl member 104 which is pivoted by rod 106 extending from bracket 108.
  • Linkage 110 adjacent to the end of arm 102 translates the reciprocal movement into what may be referred to as a sweeping motion of pawl member 104 to engage a resilient member 112.
  • the engaging portion of member 112 is provided with a substantially V-shaped portion 112a which engages the top of latch hook portion 98.
  • the latch member 70 is urged downwardly to the locked position by the resilient member 112 and the hooked portion 98 engages a bracket member 1 14 supported adjacent to the inner side of the slot opening 94.
  • the solenoid member 100 in the energized position with the pawl member 104 disposed vertically will lock the latch member 70 in contact with the bracket 1 14.
  • the reverse thrust of the arm 102 will result in the pawl member being removed from the vertical position in the direction indicated by the arrow 116.
  • the blocking feature of the pawl member on the spring member 112 is thereby removed and the door may be opened with the latch member 70 clearing the end of the bracket to provide for easy opening of the door.
  • FIG. 2 illustrates an alternative embodiment of the invention wherein pawl motion is now provided in a horizontal direction rotated approximately 90 from the vertical position indicated in FIG. 1.
  • Pawl member 118 is now actuated by arm 120 in a reciprocating direction indicated by arrow 122.
  • the upper portion of resilient spring member 112 is thereby contacted by the flat portion of the pawl member 118 rather than the end of the portion shown in FIG. 1.
  • a more positive engagement in the locked position may thereby result.
  • the pivot member 124 extends in a vertical position oriented transversely from the position of pivot member 106 in FIG. 1. It will be evident, therefore, that the within disclosed electrical door latch locking arrangement provides for automatic control with secure locking of the door without extra operator manipulation being required.
  • the magnetron energy generator 126 has been illustrated as being for the permanent magnet type and, therefore, no circuitry for an electromagnet has been disclosed. If such a magnet'is desired appropriate adaptation in the manner well known in the art will be required in the high voltage circuit.
  • a conventional three terminal connector 128 having a grounded lead 130 provides for the connection of the circuit to the customary house line voltages which can be 1 l5-l20 Volts or 220 Volts AC.
  • Terminal board 132 provides for a connection of all the components to the line voltages.
  • Light switch 134 actuated by button 54 mounted on panel 40 controls the oven light 136.
  • the door interlock switch 138 which is controlled by the movement of the door counterbalance arm in,
  • the drop-down model is connected by start-stop switch 140 actuated by panel buttons 50 and 52.
  • a stirrer of any well known configuration in the art providing for the distribution of the energy within the enclosure is actuated by means of motor 142.
  • a fan 144 is also provided to cool the magnetron energy generator as well as the high voltage components including the DC rectifier circuit 146 and step-up transformer 148 having the conventional primary and secondary windings.
  • the latch interlock switch denoted by the numeral 90 in FIGS. 1 and 2 is coupled in the circuit to a thermal cutout switch 150 to provide further safety features.
  • the 5-minute timer motor 152 is controlled by means switch 154 actuated by knob 46 in panel member 40.
  • a dial light 156 is also provided for in the timer arrangement.
  • the 30-minute timer motor 158 is actuated by switch 160 controlled by means of knob 48 previously described.
  • Dial light 162 is also provided for in the circuit to assist in the reading of this timer and indication of energy radiating in the oven.
  • Electromagnetic solenoid 100 is connected in the cir' cuit by lead 164 leading from the timer motor arrangement and is coupled in series by lead 166 with the startstop switch 140.
  • the latch interlock switch arrangement 90 is coupled in series with the solenoid 100 when the interlock is depressed.
  • door interlock switch 138 is also arranged in series with the switch 90 via the terminal board 132. In this manner both interlock switches are actuated upon the closing of the door and with the start-stop switch 140 actuated the latch is automatically locked to prevent further opening of the door while the energy generator is operative.
  • the high frequency energy generator comprising a magnetron oscillator 126 is coupled by means of high voltage transformer and DC rectifier circuits in series with the door and latch interlock switches as well as the start-stop switch.
  • the generator includes a cathode 168 together with a grounded anode 170.
  • a plurality of cavity resonators 172 are circumferentially disposed about the cathode 168.
  • the microwaves are coupled to the oven cooking enclosure by means of a coupling loop or antenna 174 which is commonly disposed within a waveguide launching section.
  • the DC rectifier circuit 146 may be of the full wave or half wave voltage doubler network type for energizing the magnetron generator 126.
  • An efficient and foolproof, as well as reliable, fully automatic door locking arrangement is disclosed which assures the completion of the cooking cycle as well as preventing tampering once the energy generator is operative.
  • the arrangement is adaptable to any type of door mounting.
  • the arrangement has an inherent long life feature in that wear and tear will not materially affect the electrical arrangement. Numerous variations, alterations or modifications of the disclosed apparatus will be evident to those skilled in the art. It is intended, therefore, that the foregoing description of the invention and the illustrative embodiments be considered in the broadest aspects and not in a limiting sense.
  • Microwave oven apparatus comprising:
  • a microwave energy generator adapted to radiate energy within said enclosure
  • interlock switch means connected in an electrical circuit for operating said generator including a lever arm;
  • said latch member being adapted to depress said lever arm when said door is closed;
  • an electromagnetically actuated reciprocally movable lock member adapted to engage the upper wall portion of said resilient member and prevent movement of said latch member while said generator is operative.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
US00178044A 1971-09-07 1971-09-07 Microwave oven door latch Expired - Lifetime US3733456A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17804471A 1971-09-07 1971-09-07

Publications (1)

Publication Number Publication Date
US3733456A true US3733456A (en) 1973-05-15

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ID=22650949

Family Applications (1)

Application Number Title Priority Date Filing Date
US00178044A Expired - Lifetime US3733456A (en) 1971-09-07 1971-09-07 Microwave oven door latch

Country Status (6)

Country Link
US (1) US3733456A (de)
JP (1) JPS521496B2 (de)
CA (1) CA954592A (de)
DE (1) DE2243539C3 (de)
GB (1) GB1371876A (de)
SE (1) SE375598B (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804442A (en) * 1972-02-07 1974-04-16 Precision Hardware Inc Electric door release
USB549964I5 (de) * 1975-02-14 1976-02-24
US3943319A (en) * 1974-02-26 1976-03-09 Matsushita Electric Industrial Co., Ltd. Microwave oven with hinged door and latch means
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
US4013312A (en) * 1975-12-05 1977-03-22 Roper Corporation Latch mechanism for self-cleaning oven
JPS52108534A (en) * 1976-03-09 1977-09-12 Matsushita Electric Ind Co Ltd High frequency heating device
US4082078A (en) * 1976-10-06 1978-04-04 Litton Systems, Inc. Pyrolytic lock assembly
US4341409A (en) * 1978-12-11 1982-07-27 Sharp Kabushiki Kaisha Door latching assembly
US4457545A (en) * 1982-05-03 1984-07-03 General Electric Company Door latch assembly
US4461940A (en) * 1980-08-29 1984-07-24 Matsushita Electric Industrial Co., Ltd. Fail-safe device for use in a heating apparatus
US4504719A (en) * 1982-02-22 1985-03-12 General Electric Company Door latch and method of assembly
US4511780A (en) * 1983-01-14 1985-04-16 Tokyo Shibaura Denki Kabushiki Kaisha Door latch assembly for microwave heating apparatus
US6229129B1 (en) * 2000-04-07 2001-05-08 Bsh Home Appliances Corporation Switch access guard
US20040011266A1 (en) * 2002-03-04 2004-01-22 Rabal Clifford R. Apparatus, and associated method, for operating a lid to a hatch
US20110254285A1 (en) * 2010-04-15 2011-10-20 Hanchett Entry Systems, Inc. Electromagnetic Energy Harvester and a Door Latch Release Mechanism as an Energy Source for the Harvester
US20140159381A1 (en) * 2011-07-15 2014-06-12 Rahrbach Gmbh Securing Mechanism for Closing a Door, in Particular an Appliance Door
CN106813275A (zh) * 2017-03-21 2017-06-09 珠海格力电器股份有限公司 一种微波连锁控制开关及微波灶具
US10704305B2 (en) * 2015-01-22 2020-07-07 Riso Kagaku Corporation Door opening/closing device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5180534A (ja) * 1974-12-25 1976-07-14 Kazunari Kichama Kokumotsubichikuso
JPS5725047Y2 (de) * 1977-11-16 1982-05-31
JPS60144006U (ja) * 1984-03-01 1985-09-25 シャープ株式会社 電子レンジ
DE3817075C2 (de) * 1988-05-19 1996-09-26 Miele & Cie Tür-Sicherheitsschalter für ein Haushaltgerät
ITBO20080556A1 (it) * 2008-09-12 2010-03-13 Premark Feg Llc Forno industriale a cottura combinata

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543214A (en) * 1947-08-21 1951-02-27 Leslie K Wildberg Closure operated switch for fuel tanks
US2754144A (en) * 1952-09-12 1956-07-10 Serv Kraft Inc Latch mechanism
US2936892A (en) * 1956-08-01 1960-05-17 Whirlpool Co Solenoid operated lid latch system
US3196242A (en) * 1961-10-25 1965-07-20 Philips Corp High-frequency oven door seal
US3480753A (en) * 1968-02-16 1969-11-25 Robert G Wilson Electronic oven

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543214A (en) * 1947-08-21 1951-02-27 Leslie K Wildberg Closure operated switch for fuel tanks
US2754144A (en) * 1952-09-12 1956-07-10 Serv Kraft Inc Latch mechanism
US2936892A (en) * 1956-08-01 1960-05-17 Whirlpool Co Solenoid operated lid latch system
US3196242A (en) * 1961-10-25 1965-07-20 Philips Corp High-frequency oven door seal
US3480753A (en) * 1968-02-16 1969-11-25 Robert G Wilson Electronic oven

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804442A (en) * 1972-02-07 1974-04-16 Precision Hardware Inc Electric door release
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
US3943319A (en) * 1974-02-26 1976-03-09 Matsushita Electric Industrial Co., Ltd. Microwave oven with hinged door and latch means
USB549964I5 (de) * 1975-02-14 1976-02-24
US3995899A (en) * 1975-02-14 1976-12-07 Hobart Corporation Microwave oven interlock
US4013312A (en) * 1975-12-05 1977-03-22 Roper Corporation Latch mechanism for self-cleaning oven
JPS52108534A (en) * 1976-03-09 1977-09-12 Matsushita Electric Ind Co Ltd High frequency heating device
US4082078A (en) * 1976-10-06 1978-04-04 Litton Systems, Inc. Pyrolytic lock assembly
US4341409A (en) * 1978-12-11 1982-07-27 Sharp Kabushiki Kaisha Door latching assembly
US4461940A (en) * 1980-08-29 1984-07-24 Matsushita Electric Industrial Co., Ltd. Fail-safe device for use in a heating apparatus
US4504719A (en) * 1982-02-22 1985-03-12 General Electric Company Door latch and method of assembly
US4457545A (en) * 1982-05-03 1984-07-03 General Electric Company Door latch assembly
US4511780A (en) * 1983-01-14 1985-04-16 Tokyo Shibaura Denki Kabushiki Kaisha Door latch assembly for microwave heating apparatus
US6229129B1 (en) * 2000-04-07 2001-05-08 Bsh Home Appliances Corporation Switch access guard
US20040011266A1 (en) * 2002-03-04 2004-01-22 Rabal Clifford R. Apparatus, and associated method, for operating a lid to a hatch
US6997129B2 (en) * 2002-03-04 2006-02-14 Skeeter Products, Inc. Apparatus, and associated method, for operating a lid to a hatch
US20110254285A1 (en) * 2010-04-15 2011-10-20 Hanchett Entry Systems, Inc. Electromagnetic Energy Harvester and a Door Latch Release Mechanism as an Energy Source for the Harvester
US8659176B2 (en) * 2010-04-15 2014-02-25 Hanchett Entry Systems, Inc. Electromagnetic energy harvester and a door latch release mechanism as an energy source for the harvester
US20140159381A1 (en) * 2011-07-15 2014-06-12 Rahrbach Gmbh Securing Mechanism for Closing a Door, in Particular an Appliance Door
US9631405B2 (en) * 2011-07-15 2017-04-25 Rahrbach Gmbh Securing mechanism for closing a door, in particular an appliance
US10704305B2 (en) * 2015-01-22 2020-07-07 Riso Kagaku Corporation Door opening/closing device
CN106813275A (zh) * 2017-03-21 2017-06-09 珠海格力电器股份有限公司 一种微波连锁控制开关及微波灶具

Also Published As

Publication number Publication date
DE2243539B2 (de) 1980-05-22
JPS521496B2 (de) 1977-01-14
JPS4836739A (de) 1973-05-30
CA954592A (en) 1974-09-10
DE2243539C3 (de) 1981-01-29
GB1371876A (en) 1974-10-30
DE2243539A1 (de) 1973-03-15
SE375598B (de) 1975-04-21
AU4499972A (en) 1974-02-07

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