US3627959A - Magnetic latching and switching - Google Patents

Magnetic latching and switching Download PDF

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Publication number
US3627959A
US3627959A US21111A US3627959DA US3627959A US 3627959 A US3627959 A US 3627959A US 21111 A US21111 A US 21111A US 3627959D A US3627959D A US 3627959DA US 3627959 A US3627959 A US 3627959A
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United States
Prior art keywords
magnetic
switching
door
accordance
latching apparatus
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Expired - Lifetime
Application number
US21111A
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English (en)
Inventor
Harry F Chapell
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MICRO-QUARTZ TECHNOLOGY Corp 1010 LYNDALE AVE NORTH MINNEAPOLIS MN 55141 A CORP OF
SAGE LABORATORIES
SAGE LABORATORIES Inc
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SAGE LABORATORIES
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Assigned to MICRO-QUARTZ TECHNOLOGY CORPORATION, A CORP. OF MN. reassignment MICRO-QUARTZ TECHNOLOGY CORPORATION, A CORP. OF MN. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MICRO-TRONICS, LTD. A CORP. F MN.
Assigned to MICRO-TRONICS, LTD., INC., 1010 LYNDALE AVE. NORTH, MINNEAPOLIS, MN 55141 A CORP. OF reassignment MICRO-TRONICS, LTD., INC., 1010 LYNDALE AVE. NORTH, MINNEAPOLIS, MN 55141 A CORP. OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MICRO-TRONICS, INC. A WI CORP.
Assigned to MICRO-QUARTZ TECHNOLOGY CORPORATION 1010 LYNDALE AVE., NORTH MINNEAPOLIS, MN 55141 A CORP. OF MN reassignment MICRO-QUARTZ TECHNOLOGY CORPORATION 1010 LYNDALE AVE., NORTH MINNEAPOLIS, MN 55141 A CORP. OF MN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MICRO-TRONICS, LTD., INC. A MN CORP.
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C19/00—Other devices specially designed for securing wings, e.g. with suction cups
    • E05C19/16—Devices holding the wing by magnetic or electromagnetic attraction

Definitions

  • a door latch and magnetically actuable switch includes an H'shaped permanent magnet and pole assembly for both latching and switching having a first pair of pole ends that are shunted by a striker plate of low-reluctance ferromagnetic material located in the door when the door is closed. Opening the door removes the shunt to actuate a magnetic switch located near a second pair of pole ends of the permanent magnet.
  • the present invention relates in general to magnetically latching andv switching and more particularly concerns a novel system especially useful for a microwave oven in which a magnet both latches a door and actuates a switch.
  • Still another object of the invention is to satisfy the above object reliably, inexpensively and relatively free from complexity.
  • the latch and switch arrange- .ment includes a magnet preferably used for both latching and drawings in which:
  • FIG. I is a perspective view of the microwave oven showing the door latch and switch according to the invention.
  • FIGS. 2A and 2B are top views of the magnetic latch and switch with the door open and closed, respectively.
  • FIG. 3 is a side view of an alternate embodiment for the magnetic switch.
  • FIG. 1 there is shown a perspective view of a microwave oven 12 having a magnetic latch and switch actuator according to the invention.
  • Door includes a recessed magnetic striker plate 14.
  • a doorjamb 22 has a surface 23 facing striker plate 14 when the door is closed.
  • Doorjamb 22 is fabricated of a nonmagnetic. high-reluctance, material to prevent flux loss through the oven itself.
  • Switch includes leads 26 and 27 which may connect to external circuitry (not shown).
  • switch 20 When door 10 is open as shown, switch 20 receives flux coupled from magnet assembly 11. When the door is closed, striker plate 14 shunts pole faces 13 and 15 of magnet assembly 11 to deactivate switch 20 by reducing the flux it receives.
  • FIGS, 2A and 2B show top views of one embodiment of a latch and reed switch arrangement with the door in open and closed positions, respectively,
  • an I-I-shaped magnet assembly 11 including low-reluctance pole ends 16 and 18, magnet 17 and pole faces 13, 15, 19 and 21. Striker plate 14 is then away from pole faces 13 and 15.
  • Switch 20, which is located near pole faces 19 and 21 of magnet assembly 11, is shown in FIG. 2A in-a closed position when the door is open.
  • the magnetic flux between pole faces 19 and 2! flowing through switch contacts 30 and 32 and support elements 34 and 36 is large enough to keep contacts 30 and 3-2 closed when plate 14 is not shunting pole faces 13 and 15.
  • Contact arms 30 and 32 typically comprise ferromagnetic material. Wires 35 and 37 connect contact arms 30 and 32 to respective external leads 26 and 27.
  • striker plate 14 is shown shunting pole faces 13 and 15 when the door is closed to open switch 20 becausethe flux through contact arms 30 and 32 is then reduced to a level insufficient to keep them closed.
  • the shape of the pole pieces 16 and 18 shown in FIGS. 2A and 2B provides the following functions: (1) a magnetic field in the vicinity of the switch that provides for efficient switch closure when the door is only slightly opened. (2) isolation between the magnet and switch so that stray magnetic leakage will not hold the switch closed after the door is shut; and (3) a convenient surface for the striker plate to short the magnetic field.
  • the invention thus assumes substantially simultaneous switch actuation and door-opening reliability with relatively few components.
  • FIG. 3 there is shown another embodiment of switch 20.
  • This variation includes an arm 45 supported at one end by support member 43, and having a ferromagnetic contact 46 affixed to the other end.
  • Arm 45 also includes an actuator shoulder 42 for pressing button 41 of switch 40 when the door is open as shown in FIG. 3.
  • ferromagnetic contact 46 moves toward magnet assembly 11, thereby pulling arm 45 to the left and pressing button 41.
  • contact 46 moves away from magnet assembly 11, thereby releasing button 41.
  • the magnet 17 may be an electromagnet. Switches with different poles and .throws may be used. Also, a U-shaped magnet assembly could be used. Among the uses of the invention, it may be used as a proximity switch in other types of devices where accurate spacial control is desired.
  • Magnetic switching and latching apparatus comprising;
  • said first member being movable toward and away from said second member
  • a magnetic flux shunting means carried by the other of said members and having an exposed surface
  • said magnetic assembly including a permanent magnet and a pair of low-reluctance pole pieces secured to opposite ends of said permanent magnet and extending toward both said magnetically actuable switching means and said magnetic flux shunting means when said first and second members are in close proximity, said pole pieces having exposed faces positioned to contact the exposed surface of said shunting means when said members are moved together,
  • said first member includes a door for carrying said magnetic flux shunting means and said second member includes a container defining an opening to be covered by said door when closed, said magnetically actuable switching means and said magnetic assembly being carried by said container.
  • Magnetic switching and latching apparatus in accordance with claim 2 wherein said magnetic flux shunting means comprises a striker plate of low-reluctance material seated in a recess in said door.
  • said switching means comprises a cantilevered ann having ferromagnetic material near the free end thereof for being attracted toward said magnetic assembly when said door is open,
  • Magnetic switching andlatching apparatus in accordance with claim 1 wherein said magnetic assembly includes an H- shaped member with said pole pieces forming the legs of the member and the permanent magnet forming the crossing part of the member.
  • Magnetic switching and latching apparatus in accordance with claim 9 wherein said pole pieces extending relatively horizontally and parallel to each other.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Ovens (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
US21111A 1970-03-19 1970-03-19 Magnetic latching and switching Expired - Lifetime US3627959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2111170A 1970-03-19 1970-03-19

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US3627959A true US3627959A (en) 1971-12-14

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US21111A Expired - Lifetime US3627959A (en) 1970-03-19 1970-03-19 Magnetic latching and switching

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US (1) US3627959A (Direct)
DE (1) DE2112567A1 (Direct)
FR (1) FR2084572A5 (Direct)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749982A (en) * 1972-09-28 1973-07-31 Motorola Inc Weathertight, vandal resistant protective enclosure for housing circuit apparatus in an otherwise exposed location
US3855919A (en) * 1972-08-21 1974-12-24 Mc Graw Edison Co Control system for a compacting machine
US3890476A (en) * 1974-08-08 1975-06-17 Gen Motors Corp Appliance cabinet with actuated door switch
US3945314A (en) * 1972-10-16 1976-03-23 Compactor Company, Inc. Waste compactor with clamshell bag support
US4022263A (en) * 1976-09-02 1977-05-10 Beckett Richard W Magnetically actuated cat door
US4135137A (en) * 1976-03-23 1979-01-16 Societe Anonyme Dite: Petrole Service Magnetic position detectors
US4241337A (en) * 1979-03-29 1980-12-23 General Electric Company Appliance door position sensor arrangement
US4319103A (en) * 1980-02-08 1982-03-09 Maurice Piget Protective encasement for machine tools
US4334136A (en) * 1979-10-01 1982-06-08 Douglas P. Mahan Microwave treating mechanism
US4455462A (en) * 1982-01-25 1984-06-19 Delucia Victor E Arc proof dual interlock safety switch
US4510361A (en) * 1982-05-03 1985-04-09 Mahan Douglas P Horizontal axis tumbler type microwave drying mechanism
US4591698A (en) * 1984-03-12 1986-05-27 Chang Hong Tsuan Electric dual and quick cooking utensil
US5293020A (en) * 1991-12-31 1994-03-08 Daewoo Electronics Co., Ltd. Microwave oven door control device
US6313445B1 (en) 2001-01-03 2001-11-06 Hp Intellectual Corp. Control for an electrical kitchen appliance with power interruption off feature
US6351372B1 (en) * 1999-09-01 2002-02-26 Ericsson Inc. Personal computing device with foldable keyboard
US6466737B1 (en) 2001-11-21 2002-10-15 Honeywell Consumer Products, Inc. Portable electric space heater
US6707360B2 (en) 1999-12-06 2004-03-16 The Aussie Kids Toy Company Pty Ltd Switchable permanent magnetic device
US20050194370A1 (en) * 2004-02-13 2005-09-08 Convotherm Elektrogeraete Gmbh Switching device for controlling an industrial cooking apparatus
US20050236408A1 (en) * 2004-04-08 2005-10-27 Maytag Corporation Door position sensing system for cooking appliance including combination heating system
US7009147B1 (en) 2005-01-12 2006-03-07 Maytag Corporation Operational modes for a cooking appliance employing combination cooking technology
US20150115630A1 (en) * 2013-10-30 2015-04-30 General Electric Company Latch assembly
US20160116171A1 (en) * 2014-10-22 2016-04-28 General Electric Company Oven airflow control

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3236290C2 (de) * 1982-09-30 1985-08-08 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Vorrichtung zum Überwachen des Schließzustandes von Türen an Mikrowellenöfen
DE102013225347A1 (de) * 2013-12-10 2015-06-11 BSH Hausgeräte GmbH Haushaltsgerät mit einer Verschlusseinrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017473A (en) * 1958-07-02 1962-01-16 Verger Nathan Magnetic switch
US3161742A (en) * 1961-08-24 1964-12-15 Specialties Dev Corp Magnetic intruder and fire deterctor
US3426166A (en) * 1966-06-09 1969-02-04 Int Standard Electric Corp Magnetic closure and switch for doors and similar devices
US3513273A (en) * 1968-09-19 1970-05-19 Harold J Qualheim Magnetically-controlled safety switch for food slicers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017473A (en) * 1958-07-02 1962-01-16 Verger Nathan Magnetic switch
US3161742A (en) * 1961-08-24 1964-12-15 Specialties Dev Corp Magnetic intruder and fire deterctor
US3426166A (en) * 1966-06-09 1969-02-04 Int Standard Electric Corp Magnetic closure and switch for doors and similar devices
US3513273A (en) * 1968-09-19 1970-05-19 Harold J Qualheim Magnetically-controlled safety switch for food slicers

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855919A (en) * 1972-08-21 1974-12-24 Mc Graw Edison Co Control system for a compacting machine
US3749982A (en) * 1972-09-28 1973-07-31 Motorola Inc Weathertight, vandal resistant protective enclosure for housing circuit apparatus in an otherwise exposed location
US3945314A (en) * 1972-10-16 1976-03-23 Compactor Company, Inc. Waste compactor with clamshell bag support
US3890476A (en) * 1974-08-08 1975-06-17 Gen Motors Corp Appliance cabinet with actuated door switch
US4135137A (en) * 1976-03-23 1979-01-16 Societe Anonyme Dite: Petrole Service Magnetic position detectors
US4022263A (en) * 1976-09-02 1977-05-10 Beckett Richard W Magnetically actuated cat door
US4241337A (en) * 1979-03-29 1980-12-23 General Electric Company Appliance door position sensor arrangement
US4334136A (en) * 1979-10-01 1982-06-08 Douglas P. Mahan Microwave treating mechanism
US4319103A (en) * 1980-02-08 1982-03-09 Maurice Piget Protective encasement for machine tools
US4455462A (en) * 1982-01-25 1984-06-19 Delucia Victor E Arc proof dual interlock safety switch
US4510361A (en) * 1982-05-03 1985-04-09 Mahan Douglas P Horizontal axis tumbler type microwave drying mechanism
US4591698A (en) * 1984-03-12 1986-05-27 Chang Hong Tsuan Electric dual and quick cooking utensil
US5293020A (en) * 1991-12-31 1994-03-08 Daewoo Electronics Co., Ltd. Microwave oven door control device
US6351372B1 (en) * 1999-09-01 2002-02-26 Ericsson Inc. Personal computing device with foldable keyboard
US7012495B2 (en) 1999-12-06 2006-03-14 The Aussie Kids Toy Company Pty Ltd. Switchable permanent magnetic device
US6707360B2 (en) 1999-12-06 2004-03-16 The Aussie Kids Toy Company Pty Ltd Switchable permanent magnetic device
US20050012579A1 (en) * 1999-12-06 2005-01-20 The Aussie Kids Toy Company Pty Ltd. Switchable permanent magnetic device
US6313445B1 (en) 2001-01-03 2001-11-06 Hp Intellectual Corp. Control for an electrical kitchen appliance with power interruption off feature
US6466737B1 (en) 2001-11-21 2002-10-15 Honeywell Consumer Products, Inc. Portable electric space heater
US7176416B2 (en) * 2004-02-13 2007-02-13 Convotherm Elektrogeraete Gmbh Switching device for controlling an industrial cooking apparatus
US20050194370A1 (en) * 2004-02-13 2005-09-08 Convotherm Elektrogeraete Gmbh Switching device for controlling an industrial cooking apparatus
US20050236408A1 (en) * 2004-04-08 2005-10-27 Maytag Corporation Door position sensing system for cooking appliance including combination heating system
US7009147B1 (en) 2005-01-12 2006-03-07 Maytag Corporation Operational modes for a cooking appliance employing combination cooking technology
US20150115630A1 (en) * 2013-10-30 2015-04-30 General Electric Company Latch assembly
US9347247B2 (en) * 2013-10-30 2016-05-24 General Electric Company Latch assembly
US20160116171A1 (en) * 2014-10-22 2016-04-28 General Electric Company Oven airflow control

Also Published As

Publication number Publication date
FR2084572A5 (Direct) 1971-12-17
DE2112567A1 (de) 1971-10-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MICRO-QUARTZ TECHNOLOGY CORPORATION, A CORP. OF MN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MICRO-TRONICS, LTD. A CORP. F MN.;REEL/FRAME:004004/0072

Effective date: 19820603

Owner name: MICRO-QUARTZ TECHNOLOGY CORPORATION, 1010 LYNDALE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MICRO-TRONICS, LTD. A CORP. F MN.;REEL/FRAME:004004/0072

Effective date: 19820603

AS Assignment

Owner name: MICRO-QUARTZ TECHNOLOGY CORPORATION 1010 LYNDALE A

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MICRO-TRONICS, LTD., INC. A MN CORP.;REEL/FRAME:004024/0290

Effective date: 19820714

Owner name: MICRO-TRONICS, LTD., INC., 1010 LYNDALE AVE. NORTH

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MICRO-TRONICS, INC. A WI CORP.;REEL/FRAME:004024/0294

Effective date: 19820603