[go: up one dir, main page]

US3863045A - Microwave oven interlock switch actuator - Google Patents

Microwave oven interlock switch actuator Download PDF

Info

Publication number
US3863045A
US3863045A US424584A US42458473A US3863045A US 3863045 A US3863045 A US 3863045A US 424584 A US424584 A US 424584A US 42458473 A US42458473 A US 42458473A US 3863045 A US3863045 A US 3863045A
Authority
US
United States
Prior art keywords
door
interlock switch
pivoted
switch means
bushing
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
US424584A
Other languages
English (en)
Inventor
Harold H Rosenberry
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
Priority to US424584A priority Critical patent/US3863045A/en
Priority to CA210838A priority patent/CA986591A/en
Priority to ZA00746453A priority patent/ZA746453B/xx
Priority to AU74231/74A priority patent/AU472618B2/en
Priority to GB4763974A priority patent/GB1461981A/en
Priority to NLAANVRAGE7414413,A priority patent/NL179696C/xx
Priority to IT53890/74A priority patent/IT1023169B/it
Priority to SE7414180A priority patent/SE394507B/xx
Priority to FR7437507A priority patent/FR2254707B1/fr
Priority to BE150621A priority patent/BE822321A/xx
Priority to JP49132611A priority patent/JPS5091843A/ja
Priority to DE2457813A priority patent/DE2457813C3/de
Priority to CH1638974A priority patent/CH580785A5/xx
Application granted granted Critical
Publication of US3863045A publication Critical patent/US3863045A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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

  • the invention relates to microwave oven apparatus and mechanical linkage means for actuating electrical interlock switch means.
  • Microwave oven apparatus is widely used in the preparation of numerous products due to the rapid preparation times resulting from the dielectric heating phenomenon.
  • the energy sourcetypically employed for such apparatus is the magnetron oscillator of the type described in the text Microwave Magnetrons, Vol. 6, Radiation Laboratory Series, by G. B. Collins,
  • the high frequency energyoscillations are radiated within an oven enclosure and the energy is uniformly distributed by such means as mode stirrers to heat a load by molecular friction resulting from the absorbed energy.
  • the oven enclosure is capable of supporting a plurality of free-space wavelengths of the operating frequency.
  • the allocated frequencies for such heating apparatus are assigned by the Federal Communications Commission and are either 915 i 13 MHZ or 2,450 i 50 MHZ in the so-called industrial, scientific and medical band of the electromagnetic energy spectrum.
  • the term microwaves is intended to define electromagnetic energy radiation having wavelengths in the order of 1 meter to 1 millimeter and'frequencies in excess of 300 MHz.
  • the bushing member is secured to a peripheral wall of the access opening.
  • the axes of rotation provided by the pivot means results in the arm actuator having a modified linear movement for positive engagement of a spring lever arm which operates the interlock switch means.
  • interlock switches are serially connected in the electrical circuits so that should any such switch means fail to operate the entire apparatus would be inoperative.
  • spring-biassing means, as well as counterbalancing arms have been employed in door members to provide for the contact between the actuator means and the interlock switch lever arm. Such arrangements are quite often subject to failure due to breakage or binding.
  • the arm actuator comprises a metallic member, such as a plated steel bar.
  • the arm guide bushing member which supports and constrains the actuator comprises a durable plastic material of a nylon or selcon composition.
  • the pivot support means for the arm actuator and bushing members comprise force-fitted cold-rolled steel pins having an enlarged head and a plating such as zinc.
  • the described mechanical linkage for actuating the interlock switch means has no sharp projections or edges which can rip door energy seal gaskets and is capable of a long life expectancy and dependable performance.
  • FIG. 1 is a perspective view partially broken away of a portion of an illustrative microwave oven apparatus embodying the invention
  • FIG. 2 is a perspective view of an arm actuator of the invention
  • FIG. 3 is an end view of an assembled arm guide bushing member of the invention.
  • FIG. 4 is an exploded perspective view of the components of the arm bushing member assembly shown in FIG. 3;
  • FIG. 5 is a plan view of a portion of the door member and a portion of the oven apparatus with the top wall removed to disclose the linkage arrangement of the invention with the door in the open position;
  • FIG. 6 is a plan view of the illustrative embodiment similar to that shown in FIG. 5 with the door in the closed position.
  • FIG. 1 a microwave oven apparatus 10 embodying the invention is shown comprising conductive walls 12 defining therebetween an oven enclosure 14.
  • Peripheral walls 16 surround an access opening and-in this embodiment a door member 18 supported by a side hinge arrangement 20 encloses the opening.
  • the door member is of the conventional type provided with a choke energy seal arrangement disposed beneath a cover member 22 of a plastic material, such as Lexan, together with secondary energy absorbing gaskets 24 of rubber impregnated with ferrite or plastic impregnated with carbon, to suppress any escaping energy.
  • the choke arrangement has not been described in detail in this specification in the interest of clarity in understanding the mechanical linkage arrangement of the invention.
  • the energy source comprising a magnetron and associated launching and distribution means have not been illustrated since they are now believed to be well known.
  • the door member includes a frame 26 having a slot 28 in a peripheral wall for engagement by end of a hand-actuated latch lock member 30 having an associated interlock switch for control of the operation of the oven apparatus.
  • the latch member 30 is positioned within the upper control panel 32 which also supports a timer 34 for the operation of the apparatus.
  • the door member 18 is also provided with a hook member 36 to engage a slot 38 in a peripheral wall 16 of the access opening. Another safety interlock switch is associated with the hook member 36 and has not been detailed for the sake of clear understanding of the structure of the present invention.
  • the cover member 22 is provided with a transparent window 40 for viewing the interior of the oven enclosure.
  • the exemplary mechanical linkage arrangement 42 for actuating of a door interlock switch is coupled between the door frame peripheral walls 26 and the access opening peripheral walls I6. Details of the assembly linkage will now be described with reference being directed to FIGS. 2-4 inclusive.
  • the door arm actuator 44 comprises a substantially flat rigid metallic member of a material such as steel, suitably plated for durability.
  • the actuator is provided with a hook-type stop member 46 to limit the overall excursion of this component.
  • the other end of arm actuator 44 is provided with an opening 48 to facilitate the pivotal mounting of this member to the peripheral door frame wall 26'by a pivot pin 50 and tab 52 arrangement as shown in FIG. 1.
  • the arm actuator 44 therefore, is pivoted about a first axis of rotation determined by the pin 50 which is fixedly secured to the door member 18.
  • FIGS. 3 and 4 a guide bushing member assembly 54 is shown which constrains and supports the arm actuator 44.
  • Upper and lower bushing body members 56 and 58 fabricated of any durable plastic material, such as nylon or selcon, are joined together to provide the second pivotal member having aligned pivot pin openings 60 and 62, as well as a slot 64 for slidably engaging the arm actuator 44.
  • the upper bushing body member 56 is further provided with a cored area 66 to lighten the weight of the overall structure.
  • Tab portions 68 and 70 extend from one sidewall of bushing body member 56.
  • the lower companion body member 58 has arched wall openings 72 and 74 for mating with the tabs 68 and 70 and to provide the clearance for slot 64 when the components are joined together.
  • Bushing member assembly 54 is pivotally secured by means of a pivot pin 76 extending through aligned openings 60 and 62 to an access opening peripheral wall 16.
  • FIG. 5 represents the door member in the open position while FIG. 6 represents the closed position.
  • a safety interlock switch 78 comprises a lever arm 80 of a substantially S-shaped configuration and a resilient metallic material.
  • the lever arm contacts snap button 82.
  • the internal electrical contacts are normally in the open position so that it is necessary for the lever arm 80 to be depressed in order to close the circuits and operate the microwave oven apparatus.
  • Terminal connectors 84, 86 and 88 connect the interlock switch 78 to the appropriate electrical circuits for operation of the high voltage supply, as well as all associated electrical circuitry for the operation of the apparatus. Details of such circuitry have been purposely omitted in this description for the sake of clarity in an understanding of the invention.
  • the electrical wiring interconnecting the interlock switch terminals to the appropriate circuitry extend through openings 90 and 92.
  • the arm actuator 44 is constrained and guided in its movement-by bushing member 54 and the door member can be moved to the limited excursion point determined by the door stop hook 46.
  • the arm actuator 44 pivots about the axis determined by the pin 54 secured to the tabs 52 and describes a circular path 94 of a substantially large radius if the actuator member 94 was freely movable.
  • a much smaller portion of a circular path 96 can be described by the arm actuator 44.
  • the axis of rotation of member 54 about pivot pin 76 is described by circular path 100.
  • the limited movement results in a combined substantially linear movement of the arm actuator in a first direction substantially parallel to the sidewalls of the oven enclosure shown by arrow [06.
  • the arm actuator 44 moves sideward in an arc, arrow 108, into the engagement position with lever arm 80 of the interlock switch and closes button 82 to actuate all the apparatus.
  • a circular path described about the hinge member 20 axis falls slightly short of intersecting the axis of the pivot pin 50 which assists in the attainment of the overall desired movement of the arm actuator 44.
  • FIG. 6 the mechanical linkage arrangement of the invention is shown with the door member in the closed position.
  • the pivot path 100 of the bushing member 54 and the limited circular path 96 of the pivotal arm actuator 44 are juxtapositioned with a spacing between the axes of rotation 50 and 76 of substantially less than the length of the arm actuator 44.
  • the distance between the two axes of rotation was less than one-third for an actuator having an overall length of 3 V2 inches. and intersect at points 102 and 104.
  • the combined movements of the interconnected components thereby provide for the limited upward and sideward movement of the arm actuator as indicated by the arrows 106 and 108.
  • the positive engagement to actuate the interlock switch means is attained throughout many door member oper-.
  • the mechanical linkage components are fabricated of materials to provide for longevity in operation and a minimum of interference with gasket energy seals surrounding the access opening.
  • the described structure may be mounted solely at the top portion of the door member 18 or such structure may be disposed at both the top and bottom of a side-hinged door assembly.
  • the structure is also adaptable to other access door arrangements wherein the door movement controls the engagement of safety interlock switch means.
  • Microwave oven apparatus comprising: an enclosure having an access opening; a door member for closing said access opening; a microwave energy source adapted to radiate energy within said enclosure; an electrical circuit for energizing said source and controlling the operation of said apparatus including safety interlock switch means; and nonspring-biassed mechanical linkage means for actuating said interlock switch means operatively associated with said door member including a first pivoted member and a second pivoted member interconnected to said first member with said first and second members having independent axes of rotation about a fixed pivot member; said fixed pivot members being juxtapositioned and spaced apart substantially less than the length of said first pivoted member when said. door member is closed;
  • said first pivoted member being secured to a peripheral wall of said door member and having a free end to engage and actuate said switch means; said second pivoted member being secured to 21 peripheral wall of said access opening and having structure to constrain and guide the movement of said first member for positive engagement of said switch means when said door member is closed.
  • said first pivoted member comprises a substantially rectangular shaped metallic arm acuator.
  • said second pivoted member comprises a bushing member having a slot to receive and slidably engage said first pivoted member.
  • said bushing member comprises separate upper and lower body members adapted to be interlocked.
  • said bushing member comprises a body member of a substantially rigid plastic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US424584A 1973-12-13 1973-12-13 Microwave oven interlock switch actuator Expired - Lifetime US3863045A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US424584A US3863045A (en) 1973-12-13 1973-12-13 Microwave oven interlock switch actuator
CA210838A CA986591A (en) 1973-12-13 1974-10-07 Microwave oven interlock switch actuator
ZA00746453A ZA746453B (en) 1973-12-13 1974-10-09 Microwave oven interlock switch actuator
AU74231/74A AU472618B2 (en) 1973-12-13 1974-10-11 Microwave oven interlock switch actuator
GB4763974A GB1461981A (en) 1973-12-13 1974-11-04 Microwave oven having a safety switch interlocked with the door
NLAANVRAGE7414413,A NL179696C (nl) 1973-12-13 1974-11-05 Microgolfoven.
IT53890/74A IT1023169B (it) 1973-12-13 1974-11-06 Perfezionamento nei forni a mioro onde
SE7414180A SE394507B (sv) 1973-12-13 1974-11-12 Mikrovagsugn, vilken innefattar minst en sekerhetsforreglingsstromstellare
FR7437507A FR2254707B1 (xx) 1973-12-13 1974-11-14
BE150621A BE822321A (fr) 1973-12-13 1974-11-18 Organe d'actionnement d'interrupteurs de verrouillage pour foura hyperfrequences
JP49132611A JPS5091843A (xx) 1973-12-13 1974-11-18
DE2457813A DE2457813C3 (de) 1973-12-13 1974-12-06 Mikrowellenofen
CH1638974A CH580785A5 (xx) 1973-12-13 1974-12-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US424584A US3863045A (en) 1973-12-13 1973-12-13 Microwave oven interlock switch actuator

Publications (1)

Publication Number Publication Date
US3863045A true US3863045A (en) 1975-01-28

Family

ID=23683136

Family Applications (1)

Application Number Title Priority Date Filing Date
US424584A Expired - Lifetime US3863045A (en) 1973-12-13 1973-12-13 Microwave oven interlock switch actuator

Country Status (13)

Country Link
US (1) US3863045A (xx)
JP (1) JPS5091843A (xx)
AU (1) AU472618B2 (xx)
BE (1) BE822321A (xx)
CA (1) CA986591A (xx)
CH (1) CH580785A5 (xx)
DE (1) DE2457813C3 (xx)
FR (1) FR2254707B1 (xx)
GB (1) GB1461981A (xx)
IT (1) IT1023169B (xx)
NL (1) NL179696C (xx)
SE (1) SE394507B (xx)
ZA (1) ZA746453B (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6437260B1 (en) * 2000-10-25 2002-08-20 Delta Electronics, Inc. Handle assembly for enabling electrical product to work
US20100140261A1 (en) * 2008-12-05 2010-06-10 Samsung Electronics Co., Ltd. Microwave oven with door change device
WO2010076201A1 (en) * 2008-12-31 2010-07-08 Arcelik Anonim Sirketi Oven with illumination switch integrated in a door hinge
US20110204047A1 (en) * 2010-02-19 2011-08-25 Hilary Rich Microwavable container
WO2023232107A1 (zh) * 2022-06-01 2023-12-07 广东美的厨房电器制造有限公司 微波炉的联锁装置和微波炉

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5616035A (en) * 1979-07-17 1981-02-16 Matsushita Electric Ind Co Ltd High-frequency heating apparatus
JPS6310403Y2 (xx) * 1980-06-20 1988-03-28
EP2390580B1 (en) * 2010-05-27 2014-10-01 Electrolux Home Products Corporation N.V. Switching-arrangement and household appliance comprising such switching arrangement
CN107911896B (zh) * 2017-12-25 2024-11-08 上饶市仕高软件科技有限公司 一种售卖柜用的微波炉加热装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US868348A (en) * 1906-09-12 1907-10-15 John Kramer Door-operated electric switch for electric-light circuits.
US3748423A (en) * 1971-03-16 1973-07-24 Matsushita Electric Ind Co Ltd Microwave oven interpose system for control of environmental radiation

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7317827U (de) * 1973-10-04 Fritzmeier G Kg Sicherung für eine Tür
DE1654734C3 (de) * 1967-07-26 1980-06-19 Fa. Karl Simon, 7234 Aichhalden Klappenhalter
US3639717A (en) * 1970-09-08 1972-02-01 Mitsubishi Electric Corp Switch actuator for an electronic cooking device
DE2224165C2 (de) * 1972-05-18 1982-03-25 Industrie Zanussi S.p.A., 33170 Pordenone, Udine Sicherheitsvorrichtung gegen den Austritt von Strahlungen aus Mikrowellengeräten
JPS5423640Y2 (xx) * 1974-08-16 1979-08-13

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US868348A (en) * 1906-09-12 1907-10-15 John Kramer Door-operated electric switch for electric-light circuits.
US3748423A (en) * 1971-03-16 1973-07-24 Matsushita Electric Ind Co Ltd Microwave oven interpose system for control of environmental radiation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6437260B1 (en) * 2000-10-25 2002-08-20 Delta Electronics, Inc. Handle assembly for enabling electrical product to work
US20100140261A1 (en) * 2008-12-05 2010-06-10 Samsung Electronics Co., Ltd. Microwave oven with door change device
US8729439B2 (en) * 2008-12-05 2014-05-20 Samsung Electronics Co., Ltd. Microwave oven with door change device
WO2010076201A1 (en) * 2008-12-31 2010-07-08 Arcelik Anonim Sirketi Oven with illumination switch integrated in a door hinge
US20110204047A1 (en) * 2010-02-19 2011-08-25 Hilary Rich Microwavable container
US8618454B2 (en) * 2010-02-19 2013-12-31 Hilary Rich Microwavable container
WO2023232107A1 (zh) * 2022-06-01 2023-12-07 广东美的厨房电器制造有限公司 微波炉的联锁装置和微波炉

Also Published As

Publication number Publication date
CH580785A5 (xx) 1976-10-15
NL179696C (nl) 1986-10-16
CA986591A (en) 1976-03-30
IT1023169B (it) 1978-05-10
FR2254707A1 (xx) 1975-07-11
ZA746453B (en) 1975-11-26
AU472618B2 (en) 1976-05-27
BE822321A (fr) 1975-03-14
NL179696B (nl) 1986-05-16
AU7423174A (en) 1976-04-15
DE2457813C3 (de) 1981-09-17
DE2457813B2 (de) 1981-01-29
NL7414413A (nl) 1975-06-17
DE2457813A1 (de) 1975-06-19
GB1461981A (en) 1977-01-19
FR2254707B1 (xx) 1981-04-10
JPS5091843A (xx) 1975-07-22
SE394507B (sv) 1977-06-27
SE7414180L (xx) 1975-06-16

Similar Documents

Publication Publication Date Title
US3863045A (en) Microwave oven interlock switch actuator
US3733456A (en) Microwave oven door latch
US2956143A (en) Microwave ovens
US4450335A (en) Door opening apparatus for heating appliance
US4053731A (en) Microwave energy oven seal
US3196237A (en) Rotary switch using plastic cover with integral leaf springs as positioning means
US3373259A (en) Electronic oven
EP0858247A2 (en) Microwave oven
US3492454A (en) Electronic oven
KR100468121B1 (ko) 전자렌지
US3898412A (en) Positive position interlock concealment shutter
US20050194380A1 (en) Microwave oven
US3736399A (en) Electromagnetic wave energy seal
US6127664A (en) Microwave compliant automatically sealing oven door
US3980856A (en) Counterbalance linkage for a microwave oven door
KR100516660B1 (ko) 전기오븐레인지의 도어 인터락 시스템
KR200217747Y1 (ko) 전자렌지의 도어
US3529114A (en) Two-position phase-matching device for electronic ovens
US4330697A (en) Drive motor assembly for use in a microwave oven
KR200149715Y1 (ko) 전자렌지의 인터록 메카니즘
KR20070103247A (ko) 전자렌지
KR200396065Y1 (ko) 전자레인지의 도어인터록장치
KR20040059141A (ko) 전자렌지
KR200193963Y1 (ko) 전자레인지의 캐비닛 조립체
US2724028A (en) Electric switching apparatus