EP0165731A3 - Improvements in electrical switches - Google Patents

Improvements in electrical switches Download PDF

Info

Publication number
EP0165731A3
EP0165731A3 EP85303808A EP85303808A EP0165731A3 EP 0165731 A3 EP0165731 A3 EP 0165731A3 EP 85303808 A EP85303808 A EP 85303808A EP 85303808 A EP85303808 A EP 85303808A EP 0165731 A3 EP0165731 A3 EP 0165731A3
Authority
EP
European Patent Office
Prior art keywords
contact
electrical
centre
over
resetting
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.)
Withdrawn
Application number
EP85303808A
Other languages
German (de)
French (fr)
Other versions
EP0165731A2 (en
Inventor
Alan Murray
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.)
Elmwood Sensors Ltd
Original Assignee
Elmwood Sensors 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 Elmwood Sensors Ltd filed Critical Elmwood Sensors Ltd
Publication of EP0165731A2 publication Critical patent/EP0165731A2/en
Publication of EP0165731A3 publication Critical patent/EP0165731A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H37/5409—Bistable switches; Resetting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/36—Snap-action arrangements depending upon deformation of elastic members using flexing of blade springs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means
    • H01H2037/705—Resetting means wherein the switch cannot be closed when the temperature is above a certain value
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/60—Means for producing snap action

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

An electrical switch for protecting equipment from oerheating has a bimetallic element (16) which breaks electrical contact at a threshold temperature and a resetting member (40) which restores it when depressed manually. A bistable, over-centre contact member (24) is arranged such that initial movement of the resetting member moves the contact member over-centre, but also displaces the contact member, leaving the electrical contacts disengaged. Electric­ al contact is only restored on release of the resetting member. In this way the risks of manual tampering with the switch are reduced.
EP85303808A 1984-05-31 1985-05-30 Improvements in electrical switches Withdrawn EP0165731A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848413912A GB8413912D0 (en) 1984-05-31 1984-05-31 Electrical switches
GB8413912 1984-05-31

Publications (2)

Publication Number Publication Date
EP0165731A2 EP0165731A2 (en) 1985-12-27
EP0165731A3 true EP0165731A3 (en) 1988-05-18

Family

ID=10561747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85303808A Withdrawn EP0165731A3 (en) 1984-05-31 1985-05-30 Improvements in electrical switches

Country Status (2)

Country Link
EP (1) EP0165731A3 (en)
GB (1) GB8413912D0 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675965B1 (en) * 1991-04-26 1993-08-06 Secap THERMAL PROTECTION DEVICE IN A TEMPERATURE LIMIT DOMAIN, IN PARTICULAR FOR A RECORDING APPARATUS FOR DATA RECORDED BY BATTERIES AND IN PARTICULAR POSTAGE MACHINE.
FR2713372B1 (en) * 1993-12-01 1996-03-01 Neopost Ind Thermal protection device for secure electronic device, in particular postage meter.
GB9904391D0 (en) * 1999-02-25 1999-04-21 Otter Controls Ltd Improvements relating to thermal controls
CN109119272A (en) * 2018-09-25 2019-01-01 深圳马太亚科技有限公司 Mute microswitch and mouse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1615217A1 (en) * 1967-09-07 1970-05-27 Dreefs E Elektro Fab Temperature limiter for electrical devices
US3924213A (en) * 1974-09-30 1975-12-02 Ranco Inc Thermostat
DE2824272B1 (en) * 1978-05-24 1979-09-13 Landis & Gyr Ag Intrinsically safe temperature limiter
US4480246A (en) * 1982-10-18 1984-10-30 Therm-O-Disc, Incorporated Trip-free manual reset thermostat

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1615217A1 (en) * 1967-09-07 1970-05-27 Dreefs E Elektro Fab Temperature limiter for electrical devices
US3924213A (en) * 1974-09-30 1975-12-02 Ranco Inc Thermostat
DE2824272B1 (en) * 1978-05-24 1979-09-13 Landis & Gyr Ag Intrinsically safe temperature limiter
US4480246A (en) * 1982-10-18 1984-10-30 Therm-O-Disc, Incorporated Trip-free manual reset thermostat

Also Published As

Publication number Publication date
GB8413912D0 (en) 1984-07-04
EP0165731A2 (en) 1985-12-27

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Legal Events

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Effective date: 19881118

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MURRAY, ALAN