US3715554A - High frequency heating apparatus - Google Patents

High frequency heating apparatus Download PDF

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Publication number
US3715554A
US3715554A US00120649A US3715554DA US3715554A US 3715554 A US3715554 A US 3715554A US 00120649 A US00120649 A US 00120649A US 3715554D A US3715554D A US 3715554DA US 3715554 A US3715554 A US 3715554A
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US
United States
Prior art keywords
door
high frequency
lever
switch
locking
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
US00120649A
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English (en)
Inventor
S Umezu
S Takeda
K Mitsudome
T Hashimura
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.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Application granted granted Critical
Publication of US3715554A publication Critical patent/US3715554A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • No.: 120,649 comprising a cabinet defining a heating chamber having an access opening at one side thereof, a door mounted on the cabinet for closing the access open-
  • a cabinet defining a heating chamber having an access opening at one side thereof, a door mounted on the cabinet for closing the access open-
  • a high frequency oscillator mounted on the March 4, 1970 Japan ..45/1s135
  • Cabinet for radiating high frequency electromagnetic wave in the heating chamber and a locking mechanism 52 u.s.c1.*. 219/1055, 200 50 A for holding the door in the closed position, there are [51] Int. Cl. "1105b 9/06 Provided a door Operating handle connected to the 58 Field ofsearch...219/10.55,412,413;126/197, mechamsm for Operating the Same and a 126/200.
  • PATENTEDFEB 6 I975 PATENTEU FEB 6 I973 SHEET k 0F 5 PATENTEDFEB 6 I973 3,715,554
  • This invention relates to high frequency heating apparatus and more particularly to improved high frequency heating apparatus such as an electronic oven provided with a locking mechanism for controlling the operation of a high frequency oscillator in response to opening and closing operationsof the door of the oven.
  • the electronic oven-utilized to cook 'various foodstuffs is usually provided with a high frequency oscillator operating at a frequency of about 2,450 MHz. If there is a gap between the periphery of the door and r the cabinet, the high frequency electromagnetic wave leaks to the outside through this gap during the operation of the oven, thereby adversely affecting nearby communication apparatus, such as a television receiving set as well as the operator of the oven. For this the door is begun to be opened inadvertently and the instant at which the switch is actually opened to deenergize the high frequency oscillator. During this time delay there is a risk of leaking the high frequency electromagnetic wave. Further, where the switch does not operate normally, due to the welding of its contacts for example, the damage to the operator and nearby apparatus becomes more serious.
  • a more specific object of this'invention is to provide anew and 1 improved electronic-oven whereby .the.
  • FIG. 1 shows a side view of an electronic oven embodying the invention
  • FIG. 2 is a sectional view showing the locking mechanism and components associated therewith which are utilized in the embodiment shown in FIG. 1;
  • FIG. 3 is a schematic connection diagram of the high frequency oven shown in FIG. 1; I
  • FIG. 4 shows a modified door locking mechanism
  • FIG. 5 shows a still further modification of the door locking mechanism
  • FIG. 6 shows another modification of the door locking mechanism
  • FIG. 7 shows a modification of the embodiment shown in FIG. 6
  • FIG. 8 shows yet another embodiment of the door locking mechanism
  • FIG. 9 shows a modification of the embodiment shown in FIG. 8.
  • the electronic oven shown in FIG. 1 comprises a cabinet 1 including a heating or cooking chamber 2 defined by a metalcasing having an access opening at one side thereof.
  • a magnetron oscillator 3 and a stirrer fan 4 are mounted on the upper wall of the cooking chamber to distribute the high frequency electromagnetic waves radiated in the cooking chamber by magnetron 3 by the action of the stirrer fan, whereby to uniformly heat and cook the foodstuff loaded in the cabinet.
  • the high frequency electromagnetic waves may be radiated through a wave guide from the magnetron oscillator into the cooking chamber.
  • a door 5 is pivotally mounted as at 6 on the lower edge of the access opening for opening and closing the cooking 7 chamber. First and second door switches 7a and 7b for the clockwise direction as viewed in FIG.
  • levers 8a and 8b urge upwardly the operating levers of switches 7a and 7b to open them.
  • levers 8a and 8b are pulled out by being guided oscillator when the door is locked and unlocked by the locking mechanism.
  • a panel board 10 carrying a timer andthe like is mounted on the cabinet above the access opening.
  • a handle 11 is mounted on the upper front portion of door 5 for operating the same.
  • the handle extends through perforations 15 and is provided with a hook 14 atits inner end, and an arm 13 pivotally mounted on a supporting plate 12 secured to the inner surface of the front wall of the door.
  • the perforations 15 have a height sufficient to permit the desired rotary motion for arm 13.
  • a spring 16 is connected between arm 13 and the inner surface of the front wall of the door for biasing the arm in the counterclockwise direction so as to cause the hook 14 to engage a locking member or latch 18 secured to the front wall 1a of the cabinet.
  • the locking mechanism is comprised by arm 13 having hook 14, spring 16 and locking member 18.
  • a micro-switch 19 for controlling the operation of magnetron 3, the operating lever 19a of microswitch 19 being arranged to be engaged by hook 14 when it is caught by locking member 18 for operating the micro-switch.
  • a metal strip 20 is secured to the rear wall of the door which is urged against the periphery of the access opening of the heating chamber 2 in order to prevent a gap from being formed between the door and the cabinet when the door is closed.
  • the arm 13 is rotated in the clockwise direction against the action of spring 16 so as to disengage the hook from the locking member concurrently with the opening of micro-switch 19.
  • FIG. '3 shows a connection diagram of the electronic 1 oven.
  • a series circuit including a fuse 22a, normally opened contacts 23a of an electromagnetic contactor 23, the second door switch 7b, the primary winding 24a of a high voltage transformer 24, other normally opened contacts 23b of the electromagnetic contactor 23, and a fuse 22b is connected across an a-c power source 21.
  • the secondary winding 24b of the high voltage transformer 24 is connected to the anode electrodes of magnetron 3 through a rectifier circuit 25 including a diode D and a capacitor C
  • the juncture between fuse 22a and normally opened contacts 23a and that between fuse 22b and normally opened contacts 23b are grounded through capacitors C and C respectively.
  • the primary winding 27a of a low voltage transformer 27 is connected across said two junctures through a source switch 26 and the secondary winding 27b of low voltage transformer 27 is connected to the cathode heater of magnetron 3.
  • One terminal of the secondary winding 27b is connected to the juncture betweerithe diode D and capacitor C of the rectifier circuit 25.
  • Connected in parallel with the primary 'winding 27a are a fan motor 28, a lamp 29 mounted in the cabinet, and a series circuit including a thermal switch 30 responsive to an excessive temperature rise of magnetron 3, the driving motor 31M of a timer 31, the normally opened contact 31a of the timer, the above described micro-switch l9 and said first door switch 7a.
  • a motor 4M for driving the stirrer fan 4 and the operating coil of electromagnetic switch 23 are connected in parallel with timer motor 31M.
  • a buzzer 32 which operates when the cooking operation is completed is connected across a series circuit including timer motor 31M and its normally opened contact 31a via a normally closed contact 31b of the timer.
  • Closure of contacts 23a and 23b supplies a high DC voltage to the anode electrodes of magnetron 3 through high voltage transformer 24 and rectifier whereby magnetron 3 begins to oscillate to radiate high frequency electromagnetic waves in cooking chamber 2 to commence the cooking operation.
  • its normally opened contact 31a is opened to deenergize timer motor 31M and the electromagnetic contactor 23, whereupon its contacts 23a and 23b are opened to stop oscillation of the magnetron.
  • FIG. 4 shows a modified embodiment of the locking mechanism.
  • the locking member 18 is in the form of a letter U having a recess 18a for receiving the operating lever 19a of micro-switch 19.
  • the vertical movement of the operating lever 19a is limited so that damage of the operating lever caused by hook 14 when it is inserted into the operating position through perforation 17 can be precluded.
  • arm 13 is comprised by a first lever 40 having an outer end connected to handle 11 and an inner end pivotally mounted on a supporting plate 12 and a second lever having an outer end pivotally mounted on supporting plate 12 and an inner end carrying book 14.
  • the first lever 40 is provided with a shoulder 42 near the pivot while the second lever 41 is provided with a projection or pin 43 cooperating with shoulder 42.
  • lever 41 and'hence hook 14 are operated only when the lever 40 is rotated in the clockwise direction so that even when the handle is rotated in the counterclockwise direction with a strong force for closing the door the engaging surfaces between hook 14 and locking member 18 and those between hook 14 and operating lever 19a which require a high degree of precision are not damaged.
  • a handle 60 with two legs 60a and 60b is slidably mounted on the door 5.
  • a rod 61a extending through the slots 62a and 63a formed through the front and rear walls 5a and 5b of the door and carrying a hook 66a on the inner end.
  • a rod 61b is connected to leg 60b, which extends through slots 62b and 63b formed through the front and rear walls of the door and carries a hook 66b at its inner end.
  • Rods 61a and 61b are provided with flanges or cross-pins 64a and 64b, respectively, for limiting the outward movement of the handle.
  • the door is normally biased toward the right as viewed in-FIG. 6 by a spring 65 connected between rod 610 and the front wall of the door.
  • On the front wall 1a of the cabinet are secured locking members or catches 68a and 68b which constitute the locking mechanism together with rods 61a, 61b and spring 65 for locking hooks 66a and 66b, thus firmly holding the door in the closed position.
  • the operating lever 69a of micro-switch 69 is engaged by hook 66a for closing the micro-switch.
  • handle 60 is operated in the direction of arrow a. This movement disengages hooks 66a and 66b from locking members 68a and 68b thus unlocking the door, while at the same time the operating lever 69a is released to open the micro-switch 69 for deenergizing the magnetron.
  • FIG. 7 shows a modification of the embodiment shown in FIG. 6.
  • handle 70 is slidably mounted on door 5 but is provided with a single rod 71 secured to one leg 70b. It is to be understood that two rods may be provided when desired as in the case shown in FIG. 6.
  • a switch casing 72 containing a micro-switch 79 is secured inside of the cabinet 1.
  • the casing 72 is pro vided with an opening aligned with an opening 76 formed through the front wall la of the cabinet and adapted to receive a hook 77 of the rod 71 and a locking member or catch 72a adapted to be engaged with the hook.
  • the locking member 72a may be formed by bending a portion of the side wall of the casing 72 which is secured to the front wall 1a of the cabinet.
  • a handle 80 is provided with. an integral lever 82 extending through a perforation-81 in the front wall 5a of the door and pivotally mounted on a supporting plate 83 secured on the inner surface of front wall 5a.
  • the outer end of lever 84 extending through perforations 85 and Y87 formed through the rear wall 35b of the door and the front wall of the cabinet is also pivotally mountedon supporting plate 83.
  • the lever 84 is provided with a hook 84a atits inner end which is caught by locking member 88 secured to the front wall la of the cabinet.
  • I-Iook 84a, locking member 88 and spring 86 comprise the locking mechanism.
  • a pin 84b cooperating with the lower side of the inner end of lever 82.
  • the lever 82 is provided with a depending arm 82a at its inner end and a pin 89 is pivotally connected to the lower end of depending arm 82a to extend into the cabinet through an opening 85a in the rear wall 5b of the door and an opening 87a through the front wall 1a of the cabinet.
  • the hook 84a is caught by the locking member 88 thus locking the door in the closed position while at the same time the pin 89 pushes the operating lever 90a of micro-switch 90 secured in the cabinet whereby the switch is closed to energize the magnetron.
  • handle 80 To open the door, handle 80 is rotated in the counterclockwise direction as shown by arrowa thus releasing pin 84b. As a result, spring 86 causes hook 84a to disengage from locking member 88'to 'unlock the door. At the same time, pin 89 is moved to the right thus opening the micro-switch to deenergize the magnetron.
  • a high frequency heating apparatus comprising a cabinet defining a heating chamber having an access opening at one side thereof, a door mounted on said cabinet for closing said access opening, a high frequency oscillator for radiating high frequency electromagnetic waves in said heating chamber and a locking mechanism for holding said door in the closed position,
  • a door operating handle mechanism including a lever arm extending from said door outwardly of said cabinet, and a handle member connected to an end of said lever arm, said lever arm being pivotally connected to said door at substantially the middle portion of said lever arm for pivotal movement in a substantially vertical plane and being connected to said locking mechanism for operating the same, the portion of said lever arm extending outside said door being upwardly curved relative to the pivot point of said lever arm;
  • said locking mechanism comprises a locking member secured to said cabinet, the end of said lever arm remote from said handle being formed with a hook adapted to engage said locking member, and a spring connected between said lever arm and said door for biasing said lever arm so as to cause said hook to engage said locking member; and wherein said switch is provided with an operating lever actuated by said hook when it is engaged with said locking member for locking said door in the closed position so as to close said switch and energize said high frequency oscillator, said operating lever being released when said hook disengages said locking member so as to open said switch and deenergize said high frequency oscillator.
  • a high frequency heating apparatus wherein said locking member is recessed to terconnecting said first and second levers such that said second lever is rotated only when said first lever is rotated in a predetermined direction.
  • a high frequency heating apparatus wherein said handle includes legs mounted on said door and adapted to be slidable in parallel with the front surface thereof; said locking member comprises a locking member secured to said cabinet, a locking rod, one end of said locking rod being secured to said leg and the other end being provided with a hook adapted to engage said locking member, and a spring connected between said locking rod and said door for causing said hook to engage said locking member when said door is closed; and said switch includes an operating lever disposed to be operated by said hook when it is engaged by said locking member so as to close said switch, said operating lever being released when said hook disengages said locking member for opening said switch, thus deenergizing said high frequency oscillator.
  • a high frequency heating apparatus wherein said switch is contained in a casing secured to said cabinet, said locking member is formed by a portion 'of said casing and said switch operating member is pivotally supported by said casing for actuati ng said switch through an adjusting screw.
  • a high frequency heating apparatus comprising a lever with its inner end pivotally mounted on said door, an arm formed on said inner end of said lever, and a pin connected to said arm and extending into said cabinet;
  • said locking mechanism comprises a locking member secured to said cabinet, a locking lever having at its inner end a hook adapted to be engaged by said locking member and pivotally mounted on said door, means for operatively interconnecting said handle and said locking lever such that said locking lever is operated only when said handle is rotated in a predetermined direction, and a spring connected between said locking lever and said door for urging said hook to engage said locking member when said door is closed; and and switch is coupled to and closed by said pin carried by said arm when said hook engages said locking member and is opened when said hook disengages said locking member for deenergizing said high frequency oscillator.
  • a high frequency heating apparatus according to claim 7 wherein said pin for operating said switch is connected to the outer end of said handle.
  • a high frequency heating apparatus according to claim 1 wherein said door operating handle mechanism includes a pair of said lever arms extending from said door and connected to said handle.
  • a high frequency heating apparatus according to claim 1 wherein said operating lever of said switch is interposed between said hook and said locking member when said door is locked in the closed position.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
US00120649A 1970-03-04 1971-03-03 High frequency heating apparatus Expired - Lifetime US3715554A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45018135A JPS5040254B1 (es) 1970-03-04 1970-03-04

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US3715554A true US3715554A (en) 1973-02-06

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US00120649A Expired - Lifetime US3715554A (en) 1970-03-04 1971-03-03 High frequency heating apparatus

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US (1) US3715554A (es)
JP (1) JPS5040254B1 (es)
GB (1) GB1294787A (es)
SE (1) SE364105B (es)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770930A (en) * 1972-01-03 1973-11-06 A Tang Microwave oven apparatus
US3794797A (en) * 1971-04-19 1974-02-26 Matsushita Electric Ind Co Ltd Leakage preventing microwave oven
FR2235254A1 (es) * 1973-06-27 1975-01-24 Matsushita Electric Ind Co Ltd
US3932716A (en) * 1974-07-15 1976-01-13 Bell Telephone Laboratories, Incorporated Latch and switch actuator interlock safety structure for electronic component module operable during insertion and removal of connector members
US3943319A (en) * 1974-02-26 1976-03-09 Matsushita Electric Industrial Co., Ltd. Microwave oven with hinged door and latch means
USRE28822E (en) * 1972-04-03 1976-05-18 Amana Refrigeration, Inc. Safety interlock system for microwave ovens
US3967088A (en) * 1973-12-14 1976-06-29 Matsushita Electric Industrial Co., Ltd. Gap detector for microwave oven
US4073000A (en) * 1976-06-30 1978-02-07 S & C Electric Company Electrical interlock apparatus for electrical equipment
US4101750A (en) * 1977-05-31 1978-07-18 Whirlpool Corporation Door interlock system for microwave oven
DE2949748A1 (de) * 1978-12-11 1980-06-12 Sharp Kk Tuerverschluss, insbesondere fuer mikrowellenherde u.dgl.
US4321445A (en) * 1980-01-28 1982-03-23 Whirlpool Corporation Door latch interlock system for microwave oven
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
US20050248163A1 (en) * 2003-07-16 2005-11-10 Lg Electronics Inc. Door opening and closing system in electric oven
US20160273781A1 (en) * 2015-03-18 2016-09-22 Miele & Cie. Kg Cooking appliance
US10873996B2 (en) * 2016-11-30 2020-12-22 Illinois Tool Works, Inc. Oven door assembly for an RF oven
US20220325898A1 (en) * 2019-08-07 2022-10-13 Sharp Kabushiki Kaisha Heating cooking apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698361A (en) * 1950-09-20 1954-12-28 Square D Co Operating means for enclosed electric circuit controlling devices
US2859744A (en) * 1955-02-18 1958-11-11 Jervis Corp Double door construction and latch mechanism
US3350542A (en) * 1967-06-05 1967-10-31 Gen Electric Oven door latching system
US3406677A (en) * 1966-06-30 1968-10-22 Tappan Co Combination mechanical-thermal latch
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
US2698361A (en) * 1950-09-20 1954-12-28 Square D Co Operating means for enclosed electric circuit controlling devices
US2859744A (en) * 1955-02-18 1958-11-11 Jervis Corp Double door construction and latch mechanism
US3406677A (en) * 1966-06-30 1968-10-22 Tappan Co Combination mechanical-thermal latch
US3350542A (en) * 1967-06-05 1967-10-31 Gen Electric Oven door latching system
US3480753A (en) * 1968-02-16 1969-11-25 Robert G Wilson Electronic oven

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3794797A (en) * 1971-04-19 1974-02-26 Matsushita Electric Ind Co Ltd Leakage preventing microwave oven
US3770930A (en) * 1972-01-03 1973-11-06 A Tang Microwave oven apparatus
USRE28822E (en) * 1972-04-03 1976-05-18 Amana Refrigeration, Inc. Safety interlock system for microwave ovens
FR2235254A1 (es) * 1973-06-27 1975-01-24 Matsushita Electric Ind Co Ltd
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
US3932716A (en) * 1974-07-15 1976-01-13 Bell Telephone Laboratories, Incorporated Latch and switch actuator interlock safety structure for electronic component module operable during insertion and removal of connector members
US4073000A (en) * 1976-06-30 1978-02-07 S & C Electric Company Electrical interlock apparatus for electrical equipment
US4101750A (en) * 1977-05-31 1978-07-18 Whirlpool Corporation Door interlock system for microwave oven
DE2949748A1 (de) * 1978-12-11 1980-06-12 Sharp Kk Tuerverschluss, insbesondere fuer mikrowellenherde u.dgl.
US4321445A (en) * 1980-01-28 1982-03-23 Whirlpool Corporation Door latch interlock system for microwave oven
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
US20050248163A1 (en) * 2003-07-16 2005-11-10 Lg Electronics Inc. Door opening and closing system in electric oven
US7556033B2 (en) * 2003-07-16 2009-07-07 Lg Electronics Inc. Door opening and closing system in electric oven
US20160273781A1 (en) * 2015-03-18 2016-09-22 Miele & Cie. Kg Cooking appliance
US10337742B2 (en) * 2015-03-18 2019-07-02 Miele & Cie. Kg Cooking appliance
US10873996B2 (en) * 2016-11-30 2020-12-22 Illinois Tool Works, Inc. Oven door assembly for an RF oven
US20220325898A1 (en) * 2019-08-07 2022-10-13 Sharp Kabushiki Kaisha Heating cooking apparatus

Also Published As

Publication number Publication date
DE2110455B2 (de) 1976-08-05
JPS5040254B1 (es) 1975-12-23
SE364105B (es) 1974-02-11
GB1294787A (en) 1972-11-01
DE2110455A1 (de) 1971-11-25

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