WO1999053513A1 - Improvements relating to thermal controls for electric heating elements - Google Patents

Improvements relating to thermal controls for electric heating elements Download PDF

Info

Publication number
WO1999053513A1
WO1999053513A1 PCT/GB1999/001132 GB9901132W WO9953513A1 WO 1999053513 A1 WO1999053513 A1 WO 1999053513A1 GB 9901132 W GB9901132 W GB 9901132W WO 9953513 A1 WO9953513 A1 WO 9953513A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
thermal sensor
contact thermal
bimetal
fusible material
Prior art date
Application number
PCT/GB1999/001132
Other languages
English (en)
French (fr)
Inventor
Robert Andrew O'neill
John Anthony Howarth
Original Assignee
Otter Controls Limited
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 Otter Controls Limited filed Critical Otter Controls Limited
Priority to EP99915934A priority Critical patent/EP1072048B1/de
Priority to DE69928517T priority patent/DE69928517T2/de
Priority to AU34354/99A priority patent/AU3435499A/en
Publication of WO1999053513A1 publication Critical patent/WO1999053513A1/en
Priority to HK02100305.8A priority patent/HK1038829A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/002—Thermally-actuated switches combined with protective means

Definitions

  • This invention concerns improvements relating to thermal controls for
  • the described embodiments comprise an appliance inlet connector based upon the Otter Controls CP7 inlet
  • cordless appliance which enables the appliance to be set down upon its base in
  • Application No. 9717144.1 has as its rationale the provision of flexibility as regards the positioning of sensors on planar heating elements inter alia to accommodate the different requirements of different appliance manufacturers.
  • the contactstat thermal sensor comprises a dished disk bimetal
  • the primary protection for example due to failure of the bimetal or welding
  • a contactstat thermal sensor comprising a bimetallic actuator, a push rod and a set of switch
  • the primary switch contacts are comprised by a fixed contact and a movable contact at one end of a spring metal beam and the other end of the beam is held in electrical contact with an electrical terminal part of the contactstat by means of a rod formed of fusible thermoplastics material, the beam being stressed over an abutment when the primary switch
  • thermoplastics allow the said one end of the beam to resile from the fixed contact of the device and, if this fails to happen and the contacts at the said one end of the beam remain closed, the increasing temperature will cause the thermoplastics
  • Figure 1 shows an exploded perspective view of a contactstat embodying the present invention
  • Figure 2 is a cross-sectional view of the contactstat of Figure 1 shown in assembled condition. Detailed Description of the Embodiment:
  • the contactstat thermal sensor shown therein comprises an auto-resetting dished disk bimetal 1, a push-rod 2 and a pair of switch contacts 3 and 4, the contact 3 constituting the moving contact of the switch contacts and being affixed to one end of a spring-metal beam 5, and the contact 4 constituting the fixed contact of the switch and being affixed to a
  • a body part 7 of the contactstat is formed of a temperature resistant plastics or ceramics material and has a bore 8 which serves to accommodate
  • the disk bimetal 1 is accommodated on top of the body part 7 within a pressed metal cap 9, formed of copper or aluminium for example,
  • a central depression 11 in the centre of the cap 9 provides an abutment with the bimetallic disk 1 and can be adjusted by deformation of the cap to adjust the bimetal operation.
  • a second body part 12 of the contactstat is adapted to fit together with the first-mentioned body part 7 so as to capture the beam 5, the terminal part 6 and a further terminal part 13 between the two body parts.
  • the two terminal parts 6 and 13 have portions 14 and 15 respectively which, when the two body parts 7 and 12 are fitted together, extend outside of the contactstat body for making spring contact with terminal pads provided on a thick film heating
  • the cap 9 has a radial extension 16 which is designed to accommodate the upper end of a rod 17 of fusible material, a thermoplastics material for example, and an opening 18 is formed in the body part 7 for admitting the
  • Locating lugs 20 are provided on the elongate edges of the beam 5 and co-operate with formations 21 provided in the body parts 7 and 12 to locate the beam appropriately when the contactstat is being assembled.
  • An upstand 22 on the body part 12 is provided for applying an upwards thrust at an appropriate time (as described hereinafter) to the beam 5 at a location closer to
  • the fusible rod 17 will soften or melt and the end 19 of the beam 5 will resile out of electrical contact with the formation 23 provided on terminal part 13.
  • the fusible rod 17 thus provides a secondary or back-up protection level which is operative in the event that the primary protection provided by the bimetal 1 fails.
  • a formation 24 is provided on the lower body part 12 to enable the contactstat to be assembled with a carrier as described in our British Patent
  • the upstand 22 may or may not, but need not, contact the beam 5 in the cold condition of the contactstat as shown in Figure 2, since in this
  • the upstand 22 does not contact the beam 5 in the cold condition of the contactstat, the forces between the end 19 of the beam and the formation 23 on the terminal part 13 will be optimized so that silver plating of these parts for better electrical contact may not be necessary.
  • the geometry of the described and illustrated arrangement is such that, in the cold condition of the contactstat, a high force is applied to the fusible rod 17 and a lower force is applied to the push-rod 2, reflecting the lower actuating force available from the bimetallic disk.
  • the upstand 22 provides a lower force from a longer, more resilient spring, namely the part of beam 5 between formation 22 and beam end 19, to provide sufficient deformation of rod 17 to open a safe
  • the fusible rod 17 is preferably formed of an electrically insulating thermoplastics material, since it is in contact with the current carrying beam 5, it could be formed of a suitable eutectic metal alloy material provided with an electrically-insulating cap. Furthermore, the fusible material rod 17 could be arranged such that, in use of the contactstat, the upper end of the rod 17 directly abuts the heating element rather than being captured within the can extension 16. With this arrangement, the beam 5 would not be stressed in the free-standing condition of the contactstat, namely before it was fitted to a heating element, and would only be stressed when the contactstat was assembled with the heating element, such assembly causing the rod 17 to be driven axially inwardly of the contactstat so as to bend the end 19 of the
PCT/GB1999/001132 1998-04-14 1999-04-14 Improvements relating to thermal controls for electric heating elements WO1999053513A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP99915934A EP1072048B1 (de) 1998-04-14 1999-04-14 Verbesserung bezüglich einer temperaturregelung für elektrische heizelemente
DE69928517T DE69928517T2 (de) 1998-04-14 1999-04-14 Verbesserung bezüglich einer temperaturregelung für elektrische heizelemente
AU34354/99A AU3435499A (en) 1998-04-14 1999-04-14 Improvements relating to thermal controls for electric heating elements
HK02100305.8A HK1038829A1 (zh) 1998-04-14 2002-01-15 電熱元件的熱控制的改進

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9807924.7 1998-04-14
GB9807924A GB2338110B (en) 1998-04-14 1998-04-14 Improvements relating to thermal controls for electric heating elements

Publications (1)

Publication Number Publication Date
WO1999053513A1 true WO1999053513A1 (en) 1999-10-21

Family

ID=10830322

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/001132 WO1999053513A1 (en) 1998-04-14 1999-04-14 Improvements relating to thermal controls for electric heating elements

Country Status (7)

Country Link
EP (2) EP1072048B1 (de)
CN (1) CN1134807C (de)
AU (1) AU3435499A (de)
DE (2) DE69928517T2 (de)
GB (2) GB2373926B (de)
HK (1) HK1038829A1 (de)
WO (1) WO1999053513A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2504753Y (zh) * 2001-10-25 2002-08-07 邵志成 改良温度感应控制结构的器具插座
GB2382465B (en) * 2001-11-14 2005-07-13 Otter Controls Ltd Improvements relating to thermally-responsive switches
CN1186703C (zh) * 2002-01-14 2005-01-26 邵志成 温控器、电连接器及电热水器具
CN100356652C (zh) * 2005-09-26 2007-12-19 常熟市天银机电有限公司 单相交流电机的过载保护器
DE102007017366B3 (de) * 2007-04-12 2008-09-18 Cherry Gmbh Elektrischer Schalter
CN102969199B (zh) * 2012-11-26 2015-01-28 佛山市天朋温控器有限公司 突跳式温控器
CN103367035A (zh) * 2013-05-24 2013-10-23 亮群电子（常熟）有限公司 一种开放式温控器及其生产工艺
CN103824727B (zh) * 2014-01-14 2015-12-23 佛山市天朋温控器有限公司 一种突跳式温控器及其封装方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2239751A1 (en) * 1973-08-04 1975-02-28 Thermostat & Schaltgeraetebau Combined thermostat and temperature fuse - is for deep-fryers when rapid interruption is needed on breakdown
EP0014102A1 (de) * 1979-01-29 1980-08-06 Eaton S.P.A. Thermostat
FR2656952A1 (fr) * 1990-01-05 1991-07-12 Seb Sa Coupe-circuit integre a un thermostat pour appareil electrique.
WO1992016003A1 (en) * 1991-03-11 1992-09-17 Otter Controls Limited Improvements relating to thermally-responsive switches

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943480A (en) * 1974-12-18 1976-03-09 Therm-O-Disc Incorporated Thermostat
DE7817937U1 (de) * 1978-06-15 1987-08-20 Inter Control Hermann Koehler Elektrik Gmbh & Co Kg, 8500 Nuernberg, De
US4472705A (en) * 1983-01-03 1984-09-18 Elmwood Sensors, Inc. Thermostatic switch with thermal override
EP0271345A3 (de) * 1986-12-12 1988-09-07 Texas Instruments Incorporated Einstellbarer Miniaturthermostat mit integriertem Übertemperaturschutz
DE3735334A1 (de) * 1987-10-19 1989-04-27 Thermostat & Schaltgeraetebau Thermisch gesteuerte elektrische schalteinrichtung
GB8807563D0 (en) * 1988-03-30 1988-05-05 Strix Ltd Electric immersion heaters

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2239751A1 (en) * 1973-08-04 1975-02-28 Thermostat & Schaltgeraetebau Combined thermostat and temperature fuse - is for deep-fryers when rapid interruption is needed on breakdown
EP0014102A1 (de) * 1979-01-29 1980-08-06 Eaton S.P.A. Thermostat
FR2656952A1 (fr) * 1990-01-05 1991-07-12 Seb Sa Coupe-circuit integre a un thermostat pour appareil electrique.
WO1992016003A1 (en) * 1991-03-11 1992-09-17 Otter Controls Limited Improvements relating to thermally-responsive switches

Also Published As

Publication number Publication date
DE69934338D1 (de) 2007-01-18
GB0216281D0 (en) 2002-08-21
HK1038829A1 (zh) 2002-03-28
GB9807924D0 (en) 1998-06-10
CN1134807C (zh) 2004-01-14
GB2338110B (en) 2002-08-28
EP1517346A1 (de) 2005-03-23
GB2338110A (en) 1999-12-08
CN1304539A (zh) 2001-07-18
DE69928517D1 (de) 2005-12-29
AU3435499A (en) 1999-11-01
DE69928517T2 (de) 2006-08-10
EP1517346B1 (de) 2006-12-06
EP1072048A1 (de) 2001-01-31
EP1072048B1 (de) 2005-11-23
GB2373926A (en) 2002-10-02
GB2373926B (en) 2002-11-13
DE69934338T2 (de) 2007-06-28

Similar Documents

Publication Publication Date Title
US5367279A (en) Overcurrent protection device
US4472705A (en) Thermostatic switch with thermal override
US4319126A (en) Temperature dependent electric current-regulator-or-limiting switching element for electrical appliances: especially electrically heated devices
US5790010A (en) Means for actuating a snap-acting M-blade
EP0714550B1 (de) Elektrische schalter
EP1517346B1 (de) Verbesserung für eine thermische Regelung eines elektrischen Heizelements
GB2339088A (en) Cordless kettle connector with bimetallic overtemperature controls
US3924213A (en) Thermostat
US6833782B2 (en) Bimetal snap disc thermostat with heaters
US4319214A (en) Creepless, snap action thermostat
US4255736A (en) Thermal protective switch
US5973586A (en) Temperature sensitive tip-switch
US4360725A (en) Overtemperature protector for an electrically heated appliance
US4135177A (en) Thermal protective switch
US4151501A (en) Terminal mounting means for thermally actuated switches
US3803526A (en) Snap acting double break switch
EP1249851B1 (de) Verbesserung bezüglich der Steuerung von elektrischen Heizungselementen
CA2341698C (en) Means for actuating a snap-acting m-blade
US6412165B1 (en) Temperature responsive snap acting control assembly, device using such assembly and method for making
JP2882768B2 (ja) 三相用サーマルプロテクタ
US3369093A (en) Snap acting thermally responsive element with contacts at the periphery thereof in rocking and sliding engagement with corresponding fixed contacts during snap action
CA1055994A (en) Thermostat comprising means preventing switch contact binding
EP0565577B1 (de) Wärmeempfindlicher elektrischer schalter
GB2372159A (en) Cordless kettle connector with bimetallic overtemperature controls
KR20040039908A (ko) 모터 보호 장치

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 99806911.6

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
NENP Non-entry into the national phase

Ref country code: KR

WWE Wipo information: entry into national phase

Ref document number: 1999915934

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1999915934

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWG Wipo information: grant in national office

Ref document number: 1999915934

Country of ref document: EP