US3777098A - Door latch assembly for a microwave cooking oven - Google Patents

Door latch assembly for a microwave cooking oven Download PDF

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Publication number
US3777098A
US3777098A US00290000A US3777098DA US3777098A US 3777098 A US3777098 A US 3777098A US 00290000 A US00290000 A US 00290000A US 3777098D A US3777098D A US 3777098DA US 3777098 A US3777098 A US 3777098A
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US
United States
Prior art keywords
latch
oven
latches
hooked
door
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
US00290000A
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English (en)
Inventor
W Tapper
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.)
Northrop Grumman Guidance and Electronics Co Inc
Original Assignee
Litton Systems 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 Litton Systems Inc filed Critical Litton Systems Inc
Application granted granted Critical
Publication of US3777098A publication Critical patent/US3777098A/en
Anticipated expiration legal-status Critical
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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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S292/00—Closure fasteners
    • Y10S292/68—Locker latches

Definitions

  • the latch element includes a base member having a inn.
  • latch receiving element comprises a first fixed aper- [22] Flled' Sept 1972 ture formed adjacent the oven face for receiving the [21] Appl. No.: 290,000 aligning projection of the latch element.
  • the latch receiving element further includes a movable body having a pair of apertures for receiving the hooked 12%: .?'3?:f?:3i:121%,22 of body also Field of Search M 219/10 292/209 includes a pair of ported plates fixedly attached /249 DIG thereto. The plates include bearing surfaces adapted to engage and be moved downwardly by the latches.
  • references cued latches are adapted to extend into the plate ports and UNITED STATES PATENTS be secured therein by a pair of leaf springs, which 3,480,753 11/1969 Wilson et a1 219/1055 function to move the plates and body upwardly in a 2,l88,703 1/1940 Burke 292/DIG.
  • 68 Secured position To disengage the hitches, the 2,498,508 2/1950 Rudolph 292/DIG. 68 able body is moved downwardly um the plate ports FOREIGN PATENTS OR APPLICATIONS move out of engagement with the hook portions of the 1,073,350 1/1960 Gennany 292 010.
  • ABSTRACT A door latch assembly for a microwave cooking oven 13 Claims, 5 Drawing Figures DOOR LATCH ASSEMBLY FOR A MICROWAVE COOKING OVEN BACKGROUND OF THE INVENTION 1.
  • Field of the Invention relates generally to doors for microwave cooking ovens and more particularly to latch mechanisms for securingsuch doors.
  • the present invention comprises a latch assembly which includes a latch element fixedly attached to the oven door.
  • the latch element includes the combination of a centering projection for aligning the first element with respect to the oven face and hooked latches for securing the latch element to the oven face.
  • a primary advantage of the centering projection is that it ensures that the oven door will always mate properly with the oven face.
  • Another aspect of the present invention is that two latches are provided to create a more secure support for the cantilevered end of the oven door.
  • a The present invention also provides dual safety switches attached to the latches for controlling the operation of the microwave power supply.
  • the advantage of this feature is that a redundant safety system is provided to ensure the safe operation of the oven.
  • FIG. 1 is a perspective view of a microwave oven utilizing a latch assembly of the present invention
  • FIG. 2 is a sectional view of the latch assembly taken along line 2-2 of FIG. 1;
  • FIG. 3 is a perspective view of the slider assembly
  • FIG. 4 is a fragmentary sectional view of one of the locking projections just prior to being released from its locked position
  • FIG. 5 is a perspective view of the microwave oven with the door in its closed position.
  • FIG. 1 shows a microwave cooking oven generally indicated by arrow 10, having a main housing assembly 11 having an oven cavity 13 formed therein.
  • the oven cavity 13 opens into a front face 15 which also includes the control panel 17.
  • the control panel 17 has a timing dial 19, a cooking cycle switch 21, and a door release lever 23 mounted thereon. Other control switches, as may be necessary, can also be mounted thereon.
  • An oven door 25 is pivotally mounted on the side of the oven front face" 15 opposite the control panel 17.
  • the oven door 25 is dimensioned to completely extend over the opening of the oven cavity 13 and is adapted to be secured in a closed position by a latch assembly 30.
  • the latch assembly includes a fixed plate 31 integrally connected to the one side of the oven door 25 by means of a pair of screws 33.
  • the fixed plate 31 includes a guide projection 35 extending rearwardly from the mid-portion thereof.
  • the plate 31 further includes a pair of hooked latches 37 extending rearwardly from the upper and lower extremities thereof.
  • the guide projection 35 is adapted to extend through an aperture 39 of the front face 15.
  • the pair of guide rollers 41 are rotatably mounted at the upper and lower sides of the aperture 39 onto a pair of flanges 43 which in turn are integrally connected to the control panel structure 17.
  • a slider assembly 45 is adapted to be movably mounted on the interior side of the control panel 17.
  • the slider assembly comprises an L-shaped slider 47 having three elongated slots 49 for receiving three bushings 51 which are connected to the interior side of the control panel 17 by three screws 53.
  • the slider 47 is adapted to easily slide along the bushing 51 through the entire length of the slots 49.
  • the slider 47 also includes a first elongated opening 55 which is adapted to receive the guide roller assembly 41 and 43 and to permit the slider 47 to move up and down without being obstructed by such assembly.
  • the slider 47 further includes a pair of elongated openings 57 which is positioned adjacent a pair of apertures 59 formed on the control panel 17 (see FIG. 2).
  • the hooked latches 37 are adapted to extend into the apertures 59 and through-the pair of elongated openings 57.
  • the hooked latches 37 are further adapted to extend into a pair of ports 61 formed on a pair of strike plates 63.
  • Each of the strike plates 63 further includes a bearing surface 65 formed on a forward edge thereof.
  • a U- shaped leaf spring 67 is mounted on each strike plate 63 j with each spring including a biasing surface 69 which is adapted to engage a respective hooked latch 37.
  • Each of the biasing surfaces 69 is beveled upwardly, the reason for which will be given in greater detail hereinafter.
  • each switch 71 is mounted on the slider adjacent each of the strike plates 63 with each switch 71 including a movable control element 73 (see FIG. 4) which is adapted to be controlled by the movement of a respective hooked projection 37.
  • Each disconnect switch 71 further includes electrical terminals 75 for connection to the power circuit for controlling the operation of the microwave oven power supply.
  • the guide projection 35 Upon closing the oven door 25 against the front face of the oven cavity 13, the guide projection 35 enters the aperture 39 and contacts the guide rollers 41.
  • the tip of the guide projection 35 is beveled in both directions to ensure that the projection 35 will contact the rollers 41 and be guided therethrough to align the entire door during such entry.
  • the hooked latches 37 As the hooked latches 37 enter the apertures 59 the top portions thereof contact the beveled surfaces 69 of the leaf springs 67.
  • the biasing surfaces 69 of the leaf springs 67 cause the slider 47 to move upwardly until the bearing surfaces 65 of the strike plates contact the lower extremities of the hooked latches 37.
  • the hooked latches 37 continue to travel inwardly until their hooked portions are biased into the ports 61 of the strike plates 63 by the leaf springs 67. As this occurs, the slider 47 moves upwardly, thereby causing the control elements 73 of the disconnect switches 71 to contact the hooked projections 37 to be depressed thereby. These switches then function to close the power supply circuit to allow the magnetron to be operable.
  • the closed position of the door is shown in FIG. 5.
  • the oven door 25 includes a handle 77 which is completely recessed within an area flush with the control panel 17. This prevents children from hanging on the handle when the oven door 25 is closed.
  • the door release lever 23 is depressed downwardly. Since the lever 23 is integrally connected to slider 47, the entire slider 47 is also moved downwardly. During this movement the strike plates 63 also move downwardly to cause the hooked projections 37 to withdraw from the ports 61. When this occurs, the biasing surfaces 69 of the leaf springs 67 function to apply a force on the hooked projections to cause it to move outwardly along the bearing surfaces 65 of the strike plates 63. This movement functions in a snap action movement and the hook projections 37 along with the door 25 are urged outwardly to be opened automatically. Also, during this movement the control elements 73 of the disconnect switches 71 are deactivated to open the power supply control circuit to ensure that the magnetrons cannot be turned on when the oven door 25 is in the open position.
  • a latch assembly for securing a microwave oven door to the front face of the microwave oven comprising:
  • a first element having a main body fixedly attached to the cantilevered end of the oven door, said main body having means for securing said first element to the oven face;
  • front face having means for receiving said securing means
  • said securing means comprising at least one hooked latch extending from said main body
  • said means for receiving said securing means comprises at least one ported plate located adjacent a respective aperture on said oven face, each port on each said plate being positioned to receive the hooked portion of a respective latch;
  • each ported plate for biasingly engaging a respective latch when the hooked portion of said latch extends into said ported plate.
  • the invention of claim 1 further including centering means for aligning said first element with respect to the oven face, said centering means comprising a projection extending from approximately the middle of said main body.
  • said means for receiving said centering means comprises an aperture having a pair of roller bearings mounted on opposite sides thereof.
  • said second element further includes a lever integrally connected thereto, said lever extending through a window formed in the oven face.
  • each of said spring means includes a bevel portion for biasing the respective latch away from said ported plate when said second element is moved with respect to said latches.
  • each switch being engageable with a respective latch when extending in a ported plate.
  • each of said ported plates includes a bearing surface positioned at an angle with respect to the horizontal movement of said respective latch, each bearing surface being engageable with the hooked portion of each respective latch to be vertically movable during horizontal movement of the respective latch during such engagement.
  • each of said spring means comprises a bevelled bearing surface which is opposed to the bearing surface of a respective ported plate.
  • the invention of claim 1 further including a hand lever extending through the front face of the oven, said lever being connected to said second element to enable the second element to be moved with respect to the hooked portions of said latches, against the bias of said spring means.
  • a latch assembly for securing a microwave oven door to the front face of the microwave oven comprising:
  • said front face of the housing having at least one aperture a first element having a main body fixedly attached to the cantilevered end of the oven door, said main body having means for securing said first element to the oven face;
  • said securing means comprising at least one hooked latch extending from said main body
  • said means for receiving said securing means comprising at least one bearing surface adjacent a respective aperture on said oven face, each bearing surface being fixedly connected to said second element to be movable therewith, said latch being movable with said cantilevered end of said door to be displaced into said aperture, each bearing surface further having an edge for lockingly engaging the hooked portion of said respective latch at the end of said latch displacement;
  • spring means mounted adjacent each of said bearing surfaces for biasing the respective edge into locking engagement with the hooked portion of said respective latch and for biasing the latch away from said edge upon disengagement of said edge with said hooked portion of said latch.
  • said second element further includes a lever extending through a window formed in the oven face.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US00290000A 1972-09-18 1972-09-18 Door latch assembly for a microwave cooking oven Expired - Lifetime US3777098A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US29000072A 1972-09-18 1972-09-18

Publications (1)

Publication Number Publication Date
US3777098A true US3777098A (en) 1973-12-04

Family

ID=23114100

Family Applications (1)

Application Number Title Priority Date Filing Date
US00290000A Expired - Lifetime US3777098A (en) 1972-09-18 1972-09-18 Door latch assembly for a microwave cooking oven

Country Status (5)

Country Link
US (1) US3777098A (enrdf_load_stackoverflow)
JP (1) JPS5242245B2 (enrdf_load_stackoverflow)
CA (1) CA994390A (enrdf_load_stackoverflow)
FR (1) FR2205088A5 (enrdf_load_stackoverflow)
GB (1) GB1429019A (enrdf_load_stackoverflow)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140030U (enrdf_load_stackoverflow) * 1974-05-04 1975-11-18
US4101750A (en) * 1977-05-31 1978-07-18 Whirlpool Corporation Door interlock system for microwave oven
FR2449849A1 (fr) * 1979-02-23 1980-09-19 Pruines Iseco De Systeme de securite pour porte de four a micro-ondes
US4321445A (en) * 1980-01-28 1982-03-23 Whirlpool Corporation Door latch interlock system for microwave oven
US4341409A (en) * 1978-12-11 1982-07-27 Sharp Kabushiki Kaisha Door latching assembly
EP0101983A1 (en) * 1982-08-19 1984-03-07 Litton Systems, Inc. Interlock switch module for a microwave oven
US4453065A (en) * 1982-05-17 1984-06-05 General Electric Company Microwave oven door aligning assembly
US4457545A (en) * 1982-05-03 1984-07-03 General Electric Company Door latch assembly
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
DE4040424A1 (de) * 1990-12-18 1992-06-25 Miele & Cie Mikrowellenherd mit einer tuer
US5841113A (en) * 1996-06-03 1998-11-24 Lg Electronics, Inc. Upward and downward movement prevention structure for microwave oven
WO2000073607A1 (en) * 1999-05-28 2000-12-07 Exit Technologies, Llc Security bar release mechanism
US6300610B1 (en) * 2000-08-25 2001-10-09 Samsung Electronics Co., Ltd. Microwave oven with door latching member
US6521875B1 (en) * 1998-11-11 2003-02-18 Samsung Electronics Co., Ltd. Microwave oven having a conducting member for controlling the supply of electrical power
US20050247650A1 (en) * 2004-05-07 2005-11-10 Vogel Mark A Vertical cable manager
US20100193499A1 (en) * 2009-02-03 2010-08-05 Blazevich John Z Multiple access microwave oven
US20130069512A1 (en) * 2011-09-19 2013-03-21 General Electric Company Actuated door opening mechanism for microwave and speedcooking products
US20220099306A1 (en) * 2020-09-30 2022-03-31 Whirlpool Emea S.P.A. Cooking appliance provided with a door latch assembly
CN116324110A (zh) * 2020-09-30 2023-06-23 布瑞威利私人有限公司 烹饪器具的门机构

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5147041U (enrdf_load_stackoverflow) * 1974-10-04 1976-04-07
JPS5840557Y2 (ja) * 1974-12-06 1983-09-12 株式会社東芝 デンシレンジ
JPS5172749A (ja) * 1975-11-20 1976-06-23 Matsushita Electric Ind Co Ltd Koshuhakanetsusochi
JPS5643616Y2 (enrdf_load_stackoverflow) * 1976-08-04 1981-10-13
GB9002605D0 (en) * 1990-02-06 1990-04-04 Rankine Gordon Storage devices
EP2291056A1 (en) * 2009-08-29 2011-03-02 Electrolux Home Products Corporation N.V. Snap arm unit for a door interlocking device
WO2023232091A1 (zh) * 2022-06-01 2023-12-07 广东美的厨房电器制造有限公司 门体组件和烹饪器具

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2188703A (en) * 1939-03-14 1940-01-30 Ethelyn M Burke Latch and lock mechanism for lockers, etc.
US2498508A (en) * 1945-11-06 1950-02-21 All Steel Equip Company Locker latch
DE1073350B (de) * 1960-01-14 O Haberteld Zurich Erwin (Schweiz) Zentralverschluß fur die Schubladen m Buroschreibtischtn und schranken
DE1198237B (de) * 1962-06-13 1965-08-05 Massey Ferguson Ltd Verschluss fuer schwenkbare Tueren
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
DE1073350B (de) * 1960-01-14 O Haberteld Zurich Erwin (Schweiz) Zentralverschluß fur die Schubladen m Buroschreibtischtn und schranken
US2188703A (en) * 1939-03-14 1940-01-30 Ethelyn M Burke Latch and lock mechanism for lockers, etc.
US2498508A (en) * 1945-11-06 1950-02-21 All Steel Equip Company Locker latch
DE1198237B (de) * 1962-06-13 1965-08-05 Massey Ferguson Ltd Verschluss fuer schwenkbare Tueren
US3480753A (en) * 1968-02-16 1969-11-25 Robert G Wilson Electronic oven

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140030U (enrdf_load_stackoverflow) * 1974-05-04 1975-11-18
US4101750A (en) * 1977-05-31 1978-07-18 Whirlpool Corporation Door interlock system for microwave oven
US4341409A (en) * 1978-12-11 1982-07-27 Sharp Kabushiki Kaisha Door latching assembly
FR2449849A1 (fr) * 1979-02-23 1980-09-19 Pruines Iseco De Systeme de securite pour porte de four a micro-ondes
US4321445A (en) * 1980-01-28 1982-03-23 Whirlpool Corporation Door latch interlock system for microwave oven
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
US4453065A (en) * 1982-05-17 1984-06-05 General Electric Company Microwave oven door aligning assembly
EP0101983A1 (en) * 1982-08-19 1984-03-07 Litton Systems, Inc. Interlock switch module for a microwave oven
US4516007A (en) * 1982-08-19 1985-05-07 Litton Systems, Inc. Interlock switch module for a microwave oven
US4511780A (en) * 1983-01-14 1985-04-16 Tokyo Shibaura Denki Kabushiki Kaisha Door latch assembly for microwave heating apparatus
DE4040424A1 (de) * 1990-12-18 1992-06-25 Miele & Cie Mikrowellenherd mit einer tuer
US5841113A (en) * 1996-06-03 1998-11-24 Lg Electronics, Inc. Upward and downward movement prevention structure for microwave oven
US6521875B1 (en) * 1998-11-11 2003-02-18 Samsung Electronics Co., Ltd. Microwave oven having a conducting member for controlling the supply of electrical power
US6634681B1 (en) 1999-05-28 2003-10-21 Exit Technologies, Inc. Security bar release mechanism
WO2000073607A1 (en) * 1999-05-28 2000-12-07 Exit Technologies, Llc Security bar release mechanism
US6300610B1 (en) * 2000-08-25 2001-10-09 Samsung Electronics Co., Ltd. Microwave oven with door latching member
US20100252701A1 (en) * 2004-05-07 2010-10-07 Panduit Corp. Vertical Cable Manager
US20050247650A1 (en) * 2004-05-07 2005-11-10 Vogel Mark A Vertical cable manager
US7762405B2 (en) * 2004-05-07 2010-07-27 Panduit Corp. Vertical cable manager
US8881916B2 (en) 2004-05-07 2014-11-11 Panduit Corp. Vertical cable manager
US20100193499A1 (en) * 2009-02-03 2010-08-05 Blazevich John Z Multiple access microwave oven
WO2010090651A1 (en) * 2009-02-03 2010-08-12 Blazevich John Z Multiple access microwave oven
US20130069512A1 (en) * 2011-09-19 2013-03-21 General Electric Company Actuated door opening mechanism for microwave and speedcooking products
US20220099306A1 (en) * 2020-09-30 2022-03-31 Whirlpool Emea S.P.A. Cooking appliance provided with a door latch assembly
CN116324110A (zh) * 2020-09-30 2023-06-23 布瑞威利私人有限公司 烹饪器具的门机构
US12104797B2 (en) * 2020-09-30 2024-10-01 Whirlpool Corporation Cooking appliance provided with a door latch assembly

Also Published As

Publication number Publication date
JPS5242245B2 (enrdf_load_stackoverflow) 1977-10-24
JPS4970252A (enrdf_load_stackoverflow) 1974-07-08
DE2339457A1 (de) 1974-04-04
DE2339457B2 (de) 1976-12-16
CA994390A (en) 1976-08-03
GB1429019A (en) 1976-03-24
FR2205088A5 (enrdf_load_stackoverflow) 1974-05-24

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