US2550546A - Magnetic snap action switch - Google Patents

Magnetic snap action switch Download PDF

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Publication number
US2550546A
US2550546A US39276A US3927648A US2550546A US 2550546 A US2550546 A US 2550546A US 39276 A US39276 A US 39276A US 3927648 A US3927648 A US 3927648A US 2550546 A US2550546 A US 2550546A
Authority
US
United States
Prior art keywords
armature
switch
magnet
snap action
resilient
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
US39276A
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English (en)
Inventor
Theodore N Flight
William H Wilson
Chinn Arthur John
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.)
Rheostatic Co Ltd
Original Assignee
Rheostatic 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 Rheostatic Co Ltd filed Critical Rheostatic Co Ltd
Application granted granted Critical
Publication of US2550546A publication Critical patent/US2550546A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/02—Energy stored by the attraction or repulsion of magnetic parts
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18888—Reciprocating to or from oscillating
    • Y10T74/18896—Snap action

Definitions

  • This invention relates to magnetic snap action switches, for use on alternating current circuits, of the micro-gap type inwhich contacts of relatively large mass and of a metal having good heat conductivity are associated with an armature, a springlever and a permanent magnet, the moving contact being arranged to have a movement of separation from the fixed contact limited to an amount suflicient only to prevent the re-strikingof an are at the voltage of the circuit broken and at such a speed as to reach this distance within the time of half a cycle.
  • This invention contemplates a switch in which the load on the switch lever is reduced to a value more nearly equal to the relatively small load required to assure adequate contact pressure.
  • a resilient switch lever carries a double armature structure so disposed in relation to the magnet that the load borne by the resilient lever is only the difierence in the magnetic pull on the twoarmatures. It is then provided that the magnetic pull on one armature is in all positions of the switch greater than on the second armature, resulting froman adjustable magnetic bias which can be arranged to act in a specific direction relative to the switch contacts, 1. e. bias either to the open or to the closed switch position.
  • the armature structure comprises two similar armature elements mechanically connected together, and mounted one on each side of a magnet, the magnet will exert a force on the armature structure in one direction and also a.
  • one of the armatures has a magnetic permeability higher than the other. Since the force on each armature is proportional to the permeability of the material from which the armature is fashioned, a greater force will be exerted'on the higher-permeability armature.
  • the permeabilities can base arranged that a greater force is exerted on the higher permeability armature in all positions of the lever arm.
  • the lever carrying one contact of the switch and the twin armature unit is a resilient member rigidly supported from the switch base and receiving movement from an actuator such as a thermal member of a thermostat, the moving portion of a pressure sensitive element or any other actuating device.
  • an actuator such as a thermal member of a thermostat, the moving portion of a pressure sensitive element or any other actuating device.
  • the gradual movement of the actuator is stored in the resilient lever as a force tending to separate the switch contacts and when this force exceeds the set pressure difference existing between the magnet and the two armatures the switch contacts separate with a snap action.
  • Figure 1 represents a perspective view of one embodiment of the improved switch of the invention
  • Figure 2 is a View of the improved switch using a high coercivity magnet of short rectangular form.
  • a twin armature unit consisting of two armatures II, I! rigidly attached to each other and to the end of the resilient lever l3 embraces the poles of the magnet I4.
  • actuator 16 With actuator 16 withdrawn'from contact with the resilient tongue I3 the pressure between contacts H, H! is proportional to theadjusted difference in the pull of the magnet on armatures H, [2.
  • B- against theresilient tongue l3 generates a force in tongue l3 in opposition to the .resultant magnetic pull between the twin armature unit H, I2 and the magnet, and when the movement of actuator l6 has generated sufficient force to overcome this pull the switch opens to the aforementioned limited amount with a snap .action.
  • the total load to be borne by :the resilient switch lever H3 at the moment of switch opening is merely the adjusted out-of-balance attraction existing between the two armatures H and I2 and the magnet Id.
  • a magnetic snap action switch comprising a magnet, a movable resilientlever arm, a pair of armature'members carried bysaid resilient lever arm for movement therewith and disposed on opposite sides. of said magnet, a pair of-switch contacts, one of which switch contacts is actuated by saidresilient lever arm, the second contact being fixed in position relative to said first contact and adapted to cooperate therewith, and means for limitin the movement of the resilient lever arm in switch-opening. direction, the relative magnetic properties of the armature members and their. relative. distances from the magnet being such that the resilient lever arm is biased in one direction in all of its positions.
  • a magnetic snap action switch as defined in claim 1 in which one of said armature members is positioned nearer to said magnet in all positions of the resilient lever arm than the other of said armature. members and the relative magnetic properties of said armature members are sucn that the resilient lever arm is always biased in a direction tending to move the armature member nearer the magnet toward the magnet.
  • the relative distances of the armature members 1 from the magnet are such that the resilient lever arm is always biased in a direction tending to move the higher permeability armature member toward the magnet.
  • a magnetic snap action switch comprising a movable resilient lever arm pivoted at one end and having a contact fixed thereto adjacent its other end, apair of armature members mounted on. said'rcsilient lever arm and extending substantially parallel thereto, a magnet fixedly mounted relative to said resilient lever arm and positioned between said armature members, a second contact fixedin position relative to said resilient lever arm such that one of said armature members is nearer to the magnet than the other in switch-closed position, and means for so limiting the movement of the resilient lever arm in switch-opening direction that the one of said' armature members which is the nearer to the magnet in switch-closed position remains the nearer to the magnet in all other positions of the resilient lever arm, whereby the resilient lever arm is' biased in the same direction in all of its positions.

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  • Electromagnets (AREA)
  • Toys (AREA)
  • Adjustable Resistors (AREA)
US39276A 1947-07-26 1948-07-17 Magnetic snap action switch Expired - Lifetime US2550546A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB268304X 1947-07-26

Publications (1)

Publication Number Publication Date
US2550546A true US2550546A (en) 1951-04-24

Family

ID=10249937

Family Applications (1)

Application Number Title Priority Date Filing Date
US39276A Expired - Lifetime US2550546A (en) 1947-07-26 1948-07-17 Magnetic snap action switch

Country Status (6)

Country Link
US (1) US2550546A (enrdf_load_stackoverflow)
BE (1) BE484113A (enrdf_load_stackoverflow)
CH (1) CH268304A (enrdf_load_stackoverflow)
FR (1) FR969520A (enrdf_load_stackoverflow)
GB (1) GB625492A (enrdf_load_stackoverflow)
NL (1) NL141584B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794955A (en) * 1957-06-04 Electrometer apparatus
DE1063683B (de) * 1955-02-28 1959-08-20 Paul Firchow Nachfgr App Und U Elektrischer Sprungschalter
DE1085948B (de) * 1957-08-20 1960-07-28 Reinhold Bauder Schaltelement fuer eine Steueranordnung mit gelochtem Programmtraeger
US2951129A (en) * 1958-02-25 1960-08-30 Donald H Mink Snap switch
US2953664A (en) * 1958-03-03 1960-09-20 Gen Electric Thermostatic switch
DE1126965B (de) * 1955-05-20 1962-04-05 Kurt Rozeck Druckknopfschalter mit durch einen Dauermagneten bewirkte Schnappumschaltung
DE1177234B (de) * 1962-11-24 1964-09-03 Honeywell Ges Mit Beschraenkte Gelenkfederanordnung fuer Schnappschalter mit Magnetverrastung
US3207877A (en) * 1959-03-02 1965-09-21 Satchwell Controls Ltd Thermostatic switch with permanent magnet induced snap action

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2120938A (en) * 1934-11-19 1938-06-14 Honeywell Regulator Co Thermostat
US2188438A (en) * 1937-05-07 1940-01-30 Honeywell Regulator Co Switching mechanism
US2267602A (en) * 1938-02-23 1941-12-23 Gen Motors Corp Electric circuit controller
US2302250A (en) * 1941-05-07 1942-11-17 Penn Electric Switch Co Double magnet snap action
US2353075A (en) * 1942-01-01 1944-07-04 Automatic Control Corp Accessory circuit switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2120938A (en) * 1934-11-19 1938-06-14 Honeywell Regulator Co Thermostat
US2188438A (en) * 1937-05-07 1940-01-30 Honeywell Regulator Co Switching mechanism
US2267602A (en) * 1938-02-23 1941-12-23 Gen Motors Corp Electric circuit controller
US2302250A (en) * 1941-05-07 1942-11-17 Penn Electric Switch Co Double magnet snap action
US2353075A (en) * 1942-01-01 1944-07-04 Automatic Control Corp Accessory circuit switch

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794955A (en) * 1957-06-04 Electrometer apparatus
DE1063683B (de) * 1955-02-28 1959-08-20 Paul Firchow Nachfgr App Und U Elektrischer Sprungschalter
DE1126965B (de) * 1955-05-20 1962-04-05 Kurt Rozeck Druckknopfschalter mit durch einen Dauermagneten bewirkte Schnappumschaltung
DE1085948B (de) * 1957-08-20 1960-07-28 Reinhold Bauder Schaltelement fuer eine Steueranordnung mit gelochtem Programmtraeger
US2951129A (en) * 1958-02-25 1960-08-30 Donald H Mink Snap switch
US2953664A (en) * 1958-03-03 1960-09-20 Gen Electric Thermostatic switch
US3207877A (en) * 1959-03-02 1965-09-21 Satchwell Controls Ltd Thermostatic switch with permanent magnet induced snap action
DE1177234B (de) * 1962-11-24 1964-09-03 Honeywell Ges Mit Beschraenkte Gelenkfederanordnung fuer Schnappschalter mit Magnetverrastung

Also Published As

Publication number Publication date
CH268304A (de) 1950-05-15
FR969520A (fr) 1950-12-21
NL141584B (nl)
BE484113A (enrdf_load_stackoverflow)
GB625492A (en) 1949-06-29

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