US2871316A - Magnetic snap action switches - Google Patents

Magnetic snap action switches Download PDF

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Publication number
US2871316A
US2871316A US713470A US71347058A US2871316A US 2871316 A US2871316 A US 2871316A US 713470 A US713470 A US 713470A US 71347058 A US71347058 A US 71347058A US 2871316 A US2871316 A US 2871316A
Authority
US
United States
Prior art keywords
contact
armature
magnet
movement
switch
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
US713470A
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English (en)
Inventor
David H Surgeoner
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 US2871316A publication Critical patent/US2871316A/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
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/66—Magnetic reinforcement of contact pressure; Magnet causing snap action
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/12—Means for adjustment of "on" or "off" operating temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/005—Radiant burner heads

Definitions

  • This invention is concerned with magnetic snap action switches of the micro-gap type such as may be operated by the deflection of a bimetal strip with change of temperature, by the difference in expansive movement of a rodand tube-type thermal member, or by the movement of a bellows or a diaphragm with pressure change or by any other operator the movement of which is required to result in precise switch operation at a particular value of temperature, pressure and the like.
  • Such switches usually consist of a moving contact associated with a magnet or an armature, moving between stops which may also form the contacts of the switch and a resilient member in which the gradually changing initiating movement is stored to generate the force required for switch operation, or the resilient member such as a strip of bimetal mayitself be the member sensitive to a changing physical value, i. e. the temperature of a space.
  • a permanent magnet and the moving contact of the switch are together carried on one end of a switch arm or strip.
  • the movement of this contact and magnet is limited by two adjustable stop screws, one or both of which may also be formed as electrical contacts, mounted one on each side of the strip 2,871,316 Patented Jan. 27, 1959 and in the axis of movement of the contact carried by the strip.
  • Two armatures are mounted also one on either side of the magnet.
  • One of these armatures is mounted with its axis along the magnetic axis of the magnet and may be of U formation, the open ends ofthe U facing the magnet, with one contact screw passing through the centre of the U.
  • the other armature is cup-formed, the open end of the cup facing the magnet. This armature is supported by the second contact screw and is in screw engagement with it, the screwed shank of this contact passing through a screwed hole in the bottom of the cup.
  • the operating differential (temperature pressure, or movement) of the switch is set by adjust ment of the magnetic cling between magnet and armature.
  • the contact screw passing through the U-shaped armature is adjusted to give a predetermined distance between the magnet and the open end of the U-shaped armature.
  • the second stop screw or contact is then adjusted to set the total movement of the moving contact at the required value for switching.
  • the value of the magnetic cling between the two armatures and the magnet is then set by the rotation of the cup formed armature on the screw engagement between it and the second stop screw.
  • Fig. 1 is an elevation of such a thermostat embodying the adjustments described in Fig. 2 is an elevation looking into the U-shaped armature from one side of the switch.
  • Fig. 2 is an elevation looking into the U-shaped armature from one side of the switch.
  • the bimetal support, the temperature adjusting screw and associated support brackets have been omitted.
  • the bimetal element 1 is supported on a bracket 2 attached to a base 3.
  • the attachment member 4 is made in spring material pressing a tongue 17 to which it is also riveted on to an adjusting screw 16.
  • the member 4 also forms the pivot for the adjustment of the position of the bimetal reiative to the fixed contact screws 5, 6 and armatures 7, 8. These latter parts (the screws 5, 6 and armatures 7, 8) are independently supported from the base 3 by brackets 9, 10. interposed between the bimetal 1 and the magnet 11 is a strip of insulating material 12.
  • the magnet 11 is fixed to the insulating strip by a rivet-formed contact 13 passing through the magnet and the strip and presenting contact surfaces on both sides of the magnet.
  • a member 14 is carried by the adjusting screw 16 which therefore rotates with it. Adjustment of the operating temperature of the thermostat is obtained by the setting of the scale on the member 14 against an indicator 15. Axial movement of the adjusting screw 16 sets the initial position of the bimetal and determines the temperature at which the switch will be operated. Movement of the bimetal with the adjusting screw is assured by the pressing of tongue 17 on to the end of the adjusting screw 16 by the spring pivot member 4.
  • the operating diiferential of the thermostat is set by adjustment of the magnetic cling between magnet and armature.
  • the operating differcntial of thethermostatis then-set by adjusting the cling between the magnet 11;and the cup-shaped: armature-Shy the rotation of armature 8 on contact 6.
  • a spring washer 18 gives pressurebetween armature 8 and contact screw 6 and also between contact screw 6 andjits support bracket 10 to guard against ac cidental movement of either adjustable part.
  • a magnetic snap action switch including avbase for the switch, aresilient contact; arm, a permanentma'gnet and movable contacts carried on; one end of the resilient contact arm,gtwoj adjustable stopspositioned one on each side of the magnet, andan armature associated with each stop, the movement of the contact arm and magnet being v limited by the two adjustable stops, characterized in that one armature is fixed relative to the base for the switch, a contact in screw engagement with said armature, the gap betweensaid armature andthemagnet being set by adjustment of the contact in screw engagement with the armature, and a contact associated with the other armature and with which said other armature v is in screw en;
  • a magnetic snap action switch as claimed in claim 1 in which the resilent contact arm comprises a bimetal strip flexibly supported froma bracket upstanding from the base, the permanent magnet and the movable contacts being carried with interposed insulation on the end of the bimetal strip remote from its attachment to the bracket, the two adjustable stops being formed as contactsrespec- -tive1y associatedwith said armatures and eachsupported by a bracket upstanding from the base one on either side of the magnet.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
US713470A 1957-02-06 1958-02-05 Magnetic snap action switches Expired - Lifetime US2871316A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4099/57A GB806768A (en) 1957-02-06 1957-02-06 Improvements in magnetic snap action electric switches

Publications (1)

Publication Number Publication Date
US2871316A true US2871316A (en) 1959-01-27

Family

ID=9770747

Family Applications (1)

Application Number Title Priority Date Filing Date
US713470A Expired - Lifetime US2871316A (en) 1957-02-06 1958-02-05 Magnetic snap action switches

Country Status (5)

Country Link
US (1) US2871316A (fr)
CH (1) CH348993A (fr)
DE (1) DE1161342B (fr)
FR (1) FR1199330A (fr)
GB (1) GB806768A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3264897A (en) * 1964-01-27 1966-08-09 Arthur J Berger Adjustable cam

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938929A (en) * 1931-04-17 1933-12-12 Pines Winterfront Co Thermostatic switch
US1976954A (en) * 1931-07-01 1934-10-16 Milwaukee Gas Specialty Co Control device
US2004114A (en) * 1932-07-29 1935-06-11 Jr Harvey Hubbell Magnet controlled switch
US2532382A (en) * 1945-11-05 1950-12-05 Sampsel Time Control Inc Constant temperature maintenance system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE522073C (de) * 1928-10-10 1931-03-31 Siemens & Halske Akt Ges Einrichtung an Temperaturzeitschaltern
US2519025A (en) * 1946-03-29 1950-08-15 George W Crise Hermetically sealed thermostatic switch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938929A (en) * 1931-04-17 1933-12-12 Pines Winterfront Co Thermostatic switch
US1976954A (en) * 1931-07-01 1934-10-16 Milwaukee Gas Specialty Co Control device
US2004114A (en) * 1932-07-29 1935-06-11 Jr Harvey Hubbell Magnet controlled switch
US2532382A (en) * 1945-11-05 1950-12-05 Sampsel Time Control Inc Constant temperature maintenance system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3264897A (en) * 1964-01-27 1966-08-09 Arthur J Berger Adjustable cam

Also Published As

Publication number Publication date
DE1161342B (de) 1964-01-16
GB806768A (en) 1958-12-31
FR1199330A (fr) 1959-12-14
CH348993A (fr) 1960-09-30

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