US3794797A - Leakage preventing microwave oven - Google Patents

Leakage preventing microwave oven Download PDF

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Publication number
US3794797A
US3794797A US00244057A US3794797DA US3794797A US 3794797 A US3794797 A US 3794797A US 00244057 A US00244057 A US 00244057A US 3794797D A US3794797D A US 3794797DA US 3794797 A US3794797 A US 3794797A
Authority
US
United States
Prior art keywords
door
door lock
lock key
key
microwave oven
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
US00244057A
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English (en)
Inventor
M Nakano
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3794797A publication Critical patent/US3794797A/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
    • 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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/02—Stoves or ranges heated by electric energy using microwaves

Definitions

  • the present invention relates to a mechanism for microwave ovens which is designed to prevent the escape of microwave energy.
  • It is an object of the present invention to provide a microwave oven comprising a door handle provided with a movable member, and door lock key operatively associated with the movable member, whereby a door lock switch is operated by the door lock key thereby preventing instantaneous leakage of microwave energy upon the opening of the door in the course of heating.
  • FIG. 1 is a perspective view of a microwaveoven according to the present invention
  • FIG. 2 is a longitudinal sectional view of the microwave oven shown in FIG. 1;
  • FIG. 3 is an exploded view of the door portion constituting the principal part of the oven of FIG. 1;
  • FIG. 4 is a perspective view of the door portion of FIG. 3 with a part broken away;
  • FIG. 5 is a sectional view taken on the line X-X of FIG. 4.
  • numeral 1 designates an oven proper; 2 aheating, cavity formed within the oven 1 and provided with a door 3 pivotably mounted by a hinge 4 at the front opening thereof.
  • a choke cavity 5 is provided in the marginal edges of the door 3 forming part thereof and the choke cavity 5 constitutes with a back plate 6 a microwave attentuating choke, with letters a and b in FIG. 2 denoting the depth of the choke cavity 5 which is selected to be one-quarter wavelength of the frequency used.
  • Numeral 7 designates a door lock key made of a material, such as, polypropylene whose loss due to high frequencies is not great.
  • the door lock key 7 is mounted so that it is extendible through the choke cavity 5 out of the upper face of the door 3 and a door lock switch 8 is mounted on that side of the oven proper 1 which opposes the door lock key 7.
  • Numeral 9 designates the handle of the door 3 comprising a handle grip 11 and a movable member 10.
  • a pantograph mechanism mounted within the door handle 9 is operatively associated with the movable member 10 of the handle 9, so that the door lock key 7 is moved vertically by a lever 13 mounted in the door 3 thereby opening and closing the door lock switch 8.
  • the door lock key is normally biased upwardly by a spring 14.
  • the lever 13 is L-shaped and its hooked portion is mounted at a pivot 14'. One end of the lever 13 is also fitted into the door lock key 7 at the lower end thereof and the other end engages with one end of a lever 15 of the pantograph mechanism 12.
  • Numeral 16 designates a magnetron mounted on the upper face of the heating cavity 2, and numeral 17 desi'gnates a material to be cooked.
  • the door lock key is provided across the choke, so that there is a simplification in the choke and the door lock mechanism, providing a door structure which is inexpensive to manufacture and compact in construction.
  • a microwave oven comprising an enclosure housing a heating cavity, a door pivotably mounted at the front opening of said heating cavity, a door handle with a movable member and a pantograph mechanism, a door lock key movably associated through said pantograph mechanism with said movable member, a choke cavity formed within a marginal portion of said door, said door lock key being extensible through said'choke cavity and an aperture in one side face of said marginal portion to the exterior of said door, and a door lock switch located on said enclosure in operative relation to said door lock key.
  • said door handle comprises a fixed handle grip portion and a movable handle grip portion which extend in a horizontally transversal direction with respect to said door, said movable handle grip portion being adapted to be movable in the normal direction to said fixed portion and having a larger grip area than that of said fixed portion, said movable member including said movable handle grip portion.
  • a microwave oven according to claim 1 wherein said choke cavity is of a thin thickness having a onefourth wavelength, and connecting means is provided inside of said choke cavity in a hollow space of said door, said connecting means connecting said pantograph mechanism and said door lock key.
  • a microwave oven according to claim 4 wherein said door lock key is formed of a straight key made of a dielectric material, and said key is movably mounted via spring means on said door, said spring means biasing said key in a direction such that said movable mem ber is restored to its normal position where said door closes said front opening of said heating cavity.
  • a microwave oven comprising an enclosure hous ing a heating cavity; a door pivotably mounted at the front opening of said heating cavity, said door having an inner, hollow space surrounded by front, back and side walls of the door; a door lock key; a door handle having a pantograph mechanism, said door handle including first and second portions extending parallel to the door, at least one of said portions being movably mounted in a direction normal to the other, said pantograph mechanism incluidng two levers pivoted at their central parts and mounted between said first and sec end portions so that said one of said first and second portions which moves in the normal direction compresses or expands said pantograph mechanism, one of said levers having one end extending through said front wall into said inner hollow'space where said one end is engaged through an L-shaped lever with said door lock key in which said L-shaped lever is pivoted at its bent section, said one end being made to abut against one end of said L-shaped lever, the other end of said L- shaped lever being inserted in a through hole formed at one end

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (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)
US00244057A 1971-04-19 1972-04-14 Leakage preventing microwave oven Expired - Lifetime US3794797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46025495A JPS5034781B1 (enrdf_load_stackoverflow) 1971-04-19 1971-04-19

Publications (1)

Publication Number Publication Date
US3794797A true US3794797A (en) 1974-02-26

Family

ID=12167626

Family Applications (1)

Application Number Title Priority Date Filing Date
US00244057A Expired - Lifetime US3794797A (en) 1971-04-19 1972-04-14 Leakage preventing microwave oven

Country Status (8)

Country Link
US (1) US3794797A (enrdf_load_stackoverflow)
JP (1) JPS5034781B1 (enrdf_load_stackoverflow)
CA (1) CA927926A (enrdf_load_stackoverflow)
DE (1) DE2218225C3 (enrdf_load_stackoverflow)
FR (1) FR2180477A1 (enrdf_load_stackoverflow)
GB (1) GB1367401A (enrdf_load_stackoverflow)
IT (1) IT965773B (enrdf_load_stackoverflow)
SE (1) SE375369B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050072777A1 (en) * 2003-10-01 2005-04-07 Lg Electronics Inc. Apparatus for shielding electromagnetic wave of microwave oven door
US10873996B2 (en) * 2016-11-30 2020-12-22 Illinois Tool Works, Inc. Oven door assembly for an RF oven

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU516684B2 (en) * 1979-02-16 1981-06-18 Rinnai Kabushiki Kaisha Oven door latch

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182164A (en) * 1962-02-28 1965-05-04 Raytheon Co Electromagnetic energy seal
US3196242A (en) * 1961-10-25 1965-07-20 Philips Corp High-frequency oven door seal
US3576417A (en) * 1969-09-17 1971-04-27 Roper Corp Construction for electronic oven appliances
US3715552A (en) * 1970-03-04 1973-02-06 Tokyo Shibaura Electric Co High frequency heating apparatus
US3715554A (en) * 1970-03-04 1973-02-06 Tokyo Shibaura Electric Co High frequency heating apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196242A (en) * 1961-10-25 1965-07-20 Philips Corp High-frequency oven door seal
US3182164A (en) * 1962-02-28 1965-05-04 Raytheon Co Electromagnetic energy seal
US3576417A (en) * 1969-09-17 1971-04-27 Roper Corp Construction for electronic oven appliances
US3715552A (en) * 1970-03-04 1973-02-06 Tokyo Shibaura Electric Co High frequency heating apparatus
US3715554A (en) * 1970-03-04 1973-02-06 Tokyo Shibaura Electric Co High frequency heating apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050072777A1 (en) * 2003-10-01 2005-04-07 Lg Electronics Inc. Apparatus for shielding electromagnetic wave of microwave oven door
US7078661B2 (en) * 2003-10-01 2006-07-18 Lg Electronics Inc. Apparatus for shielding electromagnetic wave of microwave oven door
US10873996B2 (en) * 2016-11-30 2020-12-22 Illinois Tool Works, Inc. Oven door assembly for an RF oven

Also Published As

Publication number Publication date
GB1367401A (en) 1974-09-18
FR2180477A1 (en) 1973-11-30
DE2218225C3 (de) 1975-05-22
DE2218225A1 (de) 1973-07-05
IT965773B (it) 1974-02-11
DE2218225B2 (de) 1974-09-26
FR2180477B1 (enrdf_load_stackoverflow) 1976-08-13
CA927926A (en) 1973-06-05
JPS5034781B1 (enrdf_load_stackoverflow) 1975-11-11
SE375369B (enrdf_load_stackoverflow) 1975-04-14

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