EP0793248A2 - Sicherheitsschalter, insbesondere für geschützte elektrische Widerstände - Google Patents

Sicherheitsschalter, insbesondere für geschützte elektrische Widerstände Download PDF

Info

Publication number
EP0793248A2
EP0793248A2 EP96119859A EP96119859A EP0793248A2 EP 0793248 A2 EP0793248 A2 EP 0793248A2 EP 96119859 A EP96119859 A EP 96119859A EP 96119859 A EP96119859 A EP 96119859A EP 0793248 A2 EP0793248 A2 EP 0793248A2
Authority
EP
European Patent Office
Prior art keywords
fuse
slider
metal
metal block
terminal
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.)
Granted
Application number
EP96119859A
Other languages
English (en)
French (fr)
Other versions
EP0793248A3 (de
EP0793248B1 (de
Inventor
Duilio Capraro
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.)
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
IRCA SpA Industria Resistenze Corazzate e Affini
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 IRCA SpA Industria Resistenze Corazzate e Affini filed Critical IRCA SpA Industria Resistenze Corazzate e Affini
Priority to SI9630413T priority Critical patent/SI0793248T1/xx
Publication of EP0793248A2 publication Critical patent/EP0793248A2/de
Publication of EP0793248A3 publication Critical patent/EP0793248A3/de
Application granted granted Critical
Publication of EP0793248B1 publication Critical patent/EP0793248B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H01H2037/762—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts

Definitions

  • This invention relates to a safety fuse, in particular for armoured electrical resistance elements.
  • Armoured electrical resistance elements consisting of an electrical resistance element housed in a metal sheath or armour and mantained electrically insulated from the walls of this latter, which is connected to earth.
  • the resistance element is dimensioned for correct operation under specific operating conditions, which differ according to the use for which it is intended (operation in water or air).
  • a resistance element comprising a tubular sheath surrounding an electrical heating spiral.
  • a safety device is provided at one end of the sheath and comprises an electrical conductor arranged in a cavity in the end of the sheath and having one end electrically connected to the heating spiral.
  • a rod of deformable material extends into the sheath from the closed end to make contact with a normally closed positioned external to the sheath and connected in series with the resistance element and hence with the heating spiral.
  • the rod deforms and consequently forces the switch into its open position, so interrupting power to the spiral and consequently interrupting the heating of the resistance element.
  • This device satisfactorily solves the control problem in that it offers a high degree of reliability and very rapid intervention, but at the same time it suffers from certain limits, and in particular:
  • the object of the invention is to provide a thermal switch which is of small bulk while at the same time being of high reliability.
  • the thermal fuse according to the invention comprises substantially a cylindrical bush 1 within which there is housed a metal sleeve 2 formed in two parts 3,4 of different diameter.
  • the head 5 of a metal slider, indicated overall by 6, is inserted into the larger-diameter part 4.
  • the head 5 supports a plurality of blades 7 (eight in the illustrated example) which slide along the inner walls of the sleeve 2. That end of the rod 8 not involved with the blades is inserted through a hole 9 provided in the base of a cup element 10 and is maintained stable in this configuration by being embedded in a block 11 of thermofusible material (lead, tin, etc.).
  • the fuse of the invention is mounted within the tubular metal sheath 13 of an armoured resistance element 14, such that the end contact 15 of the spiral is inserted into the cup element 10.
  • the other contact 16 is then inserted into the portion 4 of the sleeve 2 after interposing an insulating closure plug 17.
  • the metal block 11 melts and consequently slackens its grip on the end of the rod 8.
  • the elastic reaction of the spring 12 then axially shifts the slider 6, which disengages from the metal block 11 to hence interrupt circuit continuity.
  • the coil spring is positioned on the other side of the slider head and has its end connected to this latter and to the end of the portion 4 which borders on the portion 3.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
  • Non-Adjustable Resistors (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
EP96119859A 1996-03-01 1996-12-11 Sicherheitsschalter, insbesondere für geschützte elektrische Widerstände Expired - Lifetime EP0793248B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9630413T SI0793248T1 (en) 1996-03-01 1996-12-11 Safety fuse, in particular for armoured electrical resistance elements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1996VE000008U IT242160Y1 (it) 1996-03-01 1996-03-01 Fusibile di sicurezza, in particolare per resistenze elettrichecorazzate
ITVE960008U 1996-03-01

Publications (3)

Publication Number Publication Date
EP0793248A2 true EP0793248A2 (de) 1997-09-03
EP0793248A3 EP0793248A3 (de) 1998-11-25
EP0793248B1 EP0793248B1 (de) 2001-10-24

Family

ID=11424166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96119859A Expired - Lifetime EP0793248B1 (de) 1996-03-01 1996-12-11 Sicherheitsschalter, insbesondere für geschützte elektrische Widerstände

Country Status (6)

Country Link
EP (1) EP0793248B1 (de)
AT (1) ATE207654T1 (de)
DE (1) DE69616270T2 (de)
ES (1) ES2163576T3 (de)
IT (1) IT242160Y1 (de)
SI (1) SI0793248T1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10226357A1 (de) * 2002-06-13 2004-01-08 INTER CONTROL Hermann Köhler Elektrik GmbH & Co KG Thermische Sicherung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930215A (en) * 1974-11-29 1975-12-30 Texas Instruments Inc Nonresettable thermally actuated switch
US4032877A (en) * 1976-05-03 1977-06-28 Mcgraw-Edison Company Protector for electric circuits
US4189697A (en) * 1977-09-09 1980-02-19 Nifco Inc. Thermal cut-off fuse
US4276531A (en) * 1979-04-20 1981-06-30 Davis Merwyn C Nonresetable thermally actuated switch
DE8715851U1 (de) * 1987-11-30 1988-02-18 Elpag Ag Chur, Chur Rohrheizkörper mit einer Überlastungssicherung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10226357A1 (de) * 2002-06-13 2004-01-08 INTER CONTROL Hermann Köhler Elektrik GmbH & Co KG Thermische Sicherung
DE10226357B4 (de) * 2002-06-13 2004-06-24 INTER CONTROL Hermann Köhler Elektrik GmbH & Co KG Thermische Sicherung

Also Published As

Publication number Publication date
SI0793248T1 (en) 2002-06-30
DE69616270D1 (de) 2001-11-29
DE69616270T2 (de) 2002-05-23
ATE207654T1 (de) 2001-11-15
IT242160Y1 (it) 2001-06-04
ITVE960008U1 (it) 1997-09-01
EP0793248A3 (de) 1998-11-25
ES2163576T3 (es) 2002-02-01
EP0793248B1 (de) 2001-10-24

Similar Documents

Publication Publication Date Title
US5831507A (en) Dual-functional fuse unit that is responsive to electric current and ambient temperature
KR910008686B1 (ko) 전류차단기
US3944960A (en) Nonresettable thermally actuated switch
US6084764A (en) Capacitor disconnecting assembly
AU752684B2 (en) Thermal fuse
US4184139A (en) Thermal cut-off fuse
US6184601B1 (en) Thermally responsive protection apparatus
EP0315570A2 (de) Thermische Schutzeinrichtung
US20060145807A1 (en) Device for protection against surge voltages
US8153939B2 (en) Fluid-heating device comprising a thermal fuse
US20020153991A1 (en) Overload protection unit
US4259656A (en) Thermal cut-off device with an activating spring that is held in a prestressed condition by a thermally fusible pellet
KR101796787B1 (ko) 오작동 서미스터 디바이스의 제어를 위한 방법 및 장치
US9431203B2 (en) Reflowable circuit protection device
US7666544B2 (en) Connection device for electric accumulator
DK158426B (da) Elektrisk apparat til forbindelse med et terminalorgan og fremgangsmaade til fremstilling af apparat
US4356469A (en) Electrical terminal with thermal interrupter
EP0793248B1 (de) Sicherheitsschalter, insbesondere für geschützte elektrische Widerstände
US5187463A (en) Compact time delay fuse
CN1998117B (zh) 自动解除的过压放电装置及这种过压放电装置的应用
US9058949B2 (en) Thermal switch
US4512295A (en) Diesel glow plug tip enlargement protection
US3964010A (en) Simple, small-sized fuse
US4736070A (en) Miniaturized lighting or overload protective device and protective device used therein
US4203086A (en) Temperature-sensitive spiral spring sliding contact device

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

Kind code of ref document: A2

Designated state(s): AT BE CH DE ES FR GB IT LI LU NL SE

AX Request for extension of the european patent

Free format text: SI PAYMENT 961228

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE ES FR GB IT LI LU NL SE

AX Request for extension of the european patent

Free format text: SI PAYMENT 961228

17P Request for examination filed

Effective date: 19990514

17Q First examination report despatched

Effective date: 20000908

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB IT LI LU NL SE

AX Request for extension of the european patent

Free format text: SI PAYMENT 19961228

REF Corresponds to:

Ref document number: 207654

Country of ref document: AT

Date of ref document: 20011115

Kind code of ref document: T

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20011031

Year of fee payment: 6

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: ABREMA AGENCE BREVETS ET MARQUES GANGUILLET & HUMP

Ref country code: CH

Ref legal event code: EP

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20011121

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20011123

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20011128

Year of fee payment: 6

REF Corresponds to:

Ref document number: 69616270

Country of ref document: DE

Date of ref document: 20011129

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20011217

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20011221

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20011224

Year of fee payment: 6

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20020117

Year of fee payment: 6

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2163576

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 20021203

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021211

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021211

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021212

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021212

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021231

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021231

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021231

BERE Be: lapsed

Owner name: INDUSTRIA RESISTENZE CORAZZATE E AFFINI *IRCA S.P.

Effective date: 20021231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030701

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030701

EUG Se: european patent has lapsed
GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20030701

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030901

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031211

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20021212

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20061231

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20071211