EP0068686A2 - Interrupteur thermique à deux températures - Google Patents

Interrupteur thermique à deux températures Download PDF

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Publication number
EP0068686A2
EP0068686A2 EP19820303018 EP82303018A EP0068686A2 EP 0068686 A2 EP0068686 A2 EP 0068686A2 EP 19820303018 EP19820303018 EP 19820303018 EP 82303018 A EP82303018 A EP 82303018A EP 0068686 A2 EP0068686 A2 EP 0068686A2
Authority
EP
European Patent Office
Prior art keywords
housing
shaft
wafer
wall
switches
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Withdrawn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
EP19820303018
Other languages
German (de)
English (en)
Inventor
Gerald Roux
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.)
BorgWarner Transmission Systems Monaco SAM
Original Assignee
Eaton SAM
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 Eaton SAM filed Critical Eaton SAM
Publication of EP0068686A2 publication Critical patent/EP0068686A2/fr
Withdrawn legal-status Critical Current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
    • H01H37/006—Thermally-actuated switches with different switches operated at substantially different temperatures
    • 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

Definitions

  • the present invention relates to a device in which a switching condition will change at each of first and second temperatures. There may be reasons for desiring two or more different temperatures to be sensed at electrical discontinuties in a system.
  • the present invention uses a respective bimetallic disc to sense each temperature. Such a disc may be convex in one direction when below a certain temperature, and inverts its shape to present a concave surface in said one direction, when above the certain temperature. The other disc will invert at a different temperature. The inversion of shape occurs suddenly, i.e., for a very small temperature change at the certain temperature.
  • the invention concerns such devices in which the sudden change in shape of a disc causes a respective shaft to move axially and thereby to open to close a contact.
  • a device is seen in prior German Application DT-OS 1916646 in which two such discs inverting at different temperatures, and having their centres non-aligned, move separate shafts through respective guide holes in a central mass within a housing.
  • thermoswitch thus comprises three main parts, first a main housing body in which the two discs are housed at different levels, secondly a top part and cover, generally containing the contacts and terminals, and thirdly the central mass or insert in the housing, above the discs, which has parallel bores guiding the axially moving contact drive rods.
  • One rod passes through a hole in the top bimetallic disc in order to communicate movements of the lower disc to a respective moving contact of a pair.
  • the presence of the central mass or insert causes the housing to need three parts to be joined e.g., welded together. It would be desirable to need only two housing parts in order to save e.g., weight, trouble in welding or otherwise joining the parts, and thermal inertia.
  • one of the two drive shafts comprises wing-shaped projections which enable the shaft movements to be guided by the housing wall itself.
  • the central origin of the wings will have an approximately cylindrical piece with a longitudinal bore or groove in which the second shaft can reciprocate.
  • the central origin piece of the first shaft may then have two or more bores for the remaining shafts. Conceivably these shafts could instead pass along or through guide grooves or bores in the wings, but the central origin piece from which the wings radiate is the presently preferred site for the one of more shaft guides. There may be several longitudinal bores merely to provide alternatives for the one or more second shafts, to simplify the assembling.
  • the housing needs then only to comprise two parts.
  • the first houses the discs and guides the wing-shaped extensions of the first shaft. This in turn guides the one or more further shafts.
  • the second part of the housing comprises a cover or top for the contacts and terminals.
  • a first shaft 1 has a lower rod-shaped part 2, an upper rod-shaped part 3 and an intermediate enlarged part 4.
  • Part 4 has a central origin piece 5 from which three or more wings 11- radiate (to points of abutment with the housing as will become apparent below).
  • the central origin piece has a bore 6 which is parallel to the rod-shaped parts 2 and 3. There may be several longitudinal bores 6, either in the central origin piece or in one or more of the wings.
  • a second shaft 12 is arranged to slide in bore 6 for its guidance. If there are several bores 6, the second shaft will slide in that one which was most conveniently placed to receive the second shaft during construction or assembly. All these parts can be seen again in the sectioned assembly of Figure 2.
  • the assembly comprises a housing 17 consisting only of a bottom part 7 and a cover part 8 welded or otherwise held together along a circular line of contact 9.
  • the bottom housing part 7 contains a first bimetallic disc 13 resting on an annular platform 13A. This has a shape as shown being convex upwards so that it pushes shaft 1 upwards by abutting lower shaft rod-shaped portion 2, so that the upper portion 3 of the shaft 1 holds a contact arm 16 upwards and hence contacts 18 are kept open.
  • the housing cover part 8 contains the contacts 18, contact arm 16 and the upper shaft portion 3.
  • disc 13 inverts at its critical temperature to become convex downwards and project into a recess 13B in the housing. Shaft 1 then drops, as does contact arm 16 and contacts 18 touch, so that an electrical circuit is completed as a manifestation of a sensing of this first critical temperature.
  • the housing 17 contains a second bimetallic disc 14 resting on a second annular platform 14A.
  • the second disc has an aperture 14B threaded by lower shaft 2 and, like the first disc, drives the shaft 12 which as aforesaid passes through aperture 6 in the first shaft 1.
  • Shaft 12 bears on a contact blade or arm 15, which like blade or arm 16 may be biased downwards to close the contacts of a second pair 19 whenever the contact arm is released by the second disc 14 "tripping" i.e., becoming concave upwards at its critical temperature.
  • the contact pairs 18, 19 are terminated at two, three or more terminals 20 passing through the lid part of the upper housing portion '8.
  • the mode of contact termination is immaterial to the invention. In fact there may be two independent terminals per pair, or two terminals altogether may terminate pairs in series or pairs in parallel, as required.
  • housing body 17 guides one drive shaft 1; and at least one aperture or bore 6, or a groove as an alternative, guides one or more further shafts such as 12 from one or more further discs such as 14.
  • the shaft portions 2 and 3 and the bore 6 are oppositely displaced from the central axis of the housing, which may correspond with the axes of the disc and their annular platforms.
  • the central axis may pass midway between the shafts 2 and 12.
  • the rods 12, 2 and 3 are of insulating material, or are otherwise insulated from the discs and each other.
  • rods 2 and 3 and extensions 11 are injection moulded or compression moulded to integrally form drive shaft 1; alternatively one or more separate pieces may be made and bonded to form drive shaft 1.
  • One of the key advantges of the invention is that no central portion of the housing, or static insert therein need be provided to guide the drive shafts, because the invention provides that the one shaft guides one or more further drive shafts. Effectively, therefore, one set of wings 11 guides all the shaft movements

Landscapes

  • Thermally Actuated Switches (AREA)
EP19820303018 1981-06-26 1982-06-11 Interrupteur thermique à deux températures Withdrawn EP0068686A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8119776 1981-06-26
GB8119776 1981-06-26

Publications (1)

Publication Number Publication Date
EP0068686A2 true EP0068686A2 (fr) 1983-01-05

Family

ID=10522835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820303018 Withdrawn EP0068686A2 (fr) 1981-06-26 1982-06-11 Interrupteur thermique à deux températures

Country Status (1)

Country Link
EP (1) EP0068686A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0318265A3 (en) * 1987-11-23 1989-10-18 Otter Controls Limited Improvements relating to thermally responsive electric switches
GB2217111A (en) * 1988-03-31 1989-10-18 Veglia Borletti Srl A transducer
GB2331184A (en) * 1997-11-06 1999-05-12 Ubukata Ind Co Ltd Thermally responsive switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0318265A3 (en) * 1987-11-23 1989-10-18 Otter Controls Limited Improvements relating to thermally responsive electric switches
GB2217111A (en) * 1988-03-31 1989-10-18 Veglia Borletti Srl A transducer
GB2217111B (en) * 1988-03-31 1992-06-03 Veglia Borletti Srl Temperature transducer.
GB2331184A (en) * 1997-11-06 1999-05-12 Ubukata Ind Co Ltd Thermally responsive switch
GB2331184B (en) * 1997-11-06 1999-09-22 Ubukata Ind Co Ltd Thermally responsive switch

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19830324

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ROUX, GERALD