EP1072048A1 - Improvements relating to thermal controls for electric heating elements - Google Patents
Improvements relating to thermal controls for electric heating elementsInfo
- Publication number
- EP1072048A1 EP1072048A1 EP99915934A EP99915934A EP1072048A1 EP 1072048 A1 EP1072048 A1 EP 1072048A1 EP 99915934 A EP99915934 A EP 99915934A EP 99915934 A EP99915934 A EP 99915934A EP 1072048 A1 EP1072048 A1 EP 1072048A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- thermal sensor
- contact thermal
- bimetal
- fusible material
- 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
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
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04028228A EP1517346B1 (en) | 1998-04-14 | 1999-04-14 | Improvements relating to thermal controls for electric heating elements |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9807924 | 1998-04-14 | ||
GB9807924A GB2338110B (en) | 1998-04-14 | 1998-04-14 | Improvements relating to thermal controls for electric heating elements |
PCT/GB1999/001132 WO1999053513A1 (en) | 1998-04-14 | 1999-04-14 | Improvements relating to thermal controls for electric heating elements |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04028228A Division EP1517346B1 (en) | 1998-04-14 | 1999-04-14 | Improvements relating to thermal controls for electric heating elements |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1072048A1 true EP1072048A1 (en) | 2001-01-31 |
EP1072048B1 EP1072048B1 (en) | 2005-11-23 |
Family
ID=10830322
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04028228A Expired - Lifetime EP1517346B1 (en) | 1998-04-14 | 1999-04-14 | Improvements relating to thermal controls for electric heating elements |
EP99915934A Expired - Lifetime EP1072048B1 (en) | 1998-04-14 | 1999-04-14 | Improvements relating to thermal controls for electric heating elements |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04028228A Expired - Lifetime EP1517346B1 (en) | 1998-04-14 | 1999-04-14 | Improvements relating to thermal controls for electric heating elements |
Country Status (7)
Country | Link |
---|---|
EP (2) | EP1517346B1 (en) |
CN (1) | CN1134807C (en) |
AU (1) | AU3435499A (en) |
DE (2) | DE69928517T2 (en) |
GB (2) | GB2373926B (en) |
HK (1) | HK1038829A1 (en) |
WO (1) | WO1999053513A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2504753Y (en) * | 2001-10-25 | 2002-08-07 | 邵志成 | Socket with improved temp induction control structure |
GB2382465B (en) * | 2001-11-14 | 2005-07-13 | Otter Controls Ltd | Improvements relating to thermally-responsive switches |
CN1186703C (en) * | 2002-01-14 | 2005-01-26 | 邵志成 | Temp controller, electric connector and electric water heater |
CN100356652C (en) * | 2005-09-26 | 2007-12-19 | 常熟市天银机电有限公司 | Overload protector of single-phase AC motor |
DE102007017366B3 (en) * | 2007-04-12 | 2008-09-18 | Cherry Gmbh | Electric switch |
CN102969199B (en) * | 2012-11-26 | 2015-01-28 | 佛山市天朋温控器有限公司 | Snap-type thermostat |
CN103367035A (en) * | 2013-05-24 | 2013-10-23 | 亮群电子(常熟)有限公司 | Open temperature controller and production process thereof |
CN103824727B (en) * | 2014-01-14 | 2015-12-23 | 佛山市天朋温控器有限公司 | A kind of Kick type temperature controller and method for packing thereof |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2339674C2 (en) * | 1973-08-04 | 1989-09-21 | Thermostat-und Schaltgerätebau GmbH & Co KG, 8730 Bad Kissingen | Temperature regulator with fusible metal fuse |
US3943480A (en) * | 1974-12-18 | 1976-03-09 | Therm-O-Disc Incorporated | Thermostat |
DE2826205C2 (en) * | 1978-06-15 | 1986-11-20 | Inter Control Hermann Köhler Elektrik GmbH & Co KG, 8500 Nürnberg | Thermal fuse for electrical devices |
IT1110797B (en) * | 1979-01-29 | 1986-01-06 | Eaton Spa | THERMOSTAT, PARTICULARLY BIMETAL, WITH SAFETY SWITCH |
US4472705A (en) * | 1983-01-03 | 1984-09-18 | Elmwood Sensors, Inc. | Thermostatic switch with thermal override |
EP0271345A3 (en) * | 1986-12-12 | 1988-09-07 | Texas Instruments Incorporated | Miniature adjustable thermostat with integral over-temperature protection |
DE3735334A1 (en) * | 1987-10-19 | 1989-04-27 | Thermostat & Schaltgeraetebau | THERMALLY CONTROLLED ELECTRICAL SWITCHING DEVICE |
GB8807563D0 (en) * | 1988-03-30 | 1988-05-05 | Strix Ltd | Electric immersion heaters |
FR2656952B1 (en) * | 1990-01-05 | 1995-04-14 | Seb Sa | CIRCUIT BREAKER INTEGRATED WITH A THERMOSTAT FOR ELECTRICAL APPLIANCE. |
GB9105111D0 (en) * | 1991-03-11 | 1991-04-24 | Otter Controls Ltd | Improvements relating to thermally-responsive switches |
-
1998
- 1998-04-14 GB GB0216281A patent/GB2373926B/en not_active Expired - Fee Related
- 1998-04-14 GB GB9807924A patent/GB2338110B/en not_active Expired - Fee Related
-
1999
- 1999-04-14 EP EP04028228A patent/EP1517346B1/en not_active Expired - Lifetime
- 1999-04-14 EP EP99915934A patent/EP1072048B1/en not_active Expired - Lifetime
- 1999-04-14 CN CNB998069116A patent/CN1134807C/en not_active Expired - Fee Related
- 1999-04-14 DE DE69928517T patent/DE69928517T2/en not_active Expired - Fee Related
- 1999-04-14 AU AU34354/99A patent/AU3435499A/en not_active Abandoned
- 1999-04-14 DE DE69934338T patent/DE69934338T2/en not_active Expired - Fee Related
- 1999-04-14 WO PCT/GB1999/001132 patent/WO1999053513A1/en active IP Right Grant
-
2002
- 2002-01-15 HK HK02100305.8A patent/HK1038829A1/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9953513A1 * |
Also Published As
Publication number | Publication date |
---|---|
HK1038829A1 (en) | 2002-03-28 |
DE69934338D1 (en) | 2007-01-18 |
GB2373926A (en) | 2002-10-02 |
AU3435499A (en) | 1999-11-01 |
DE69934338T2 (en) | 2007-06-28 |
EP1517346A1 (en) | 2005-03-23 |
EP1517346B1 (en) | 2006-12-06 |
CN1134807C (en) | 2004-01-14 |
GB2373926B (en) | 2002-11-13 |
EP1072048B1 (en) | 2005-11-23 |
WO1999053513A1 (en) | 1999-10-21 |
DE69928517D1 (en) | 2005-12-29 |
GB2338110A (en) | 1999-12-08 |
GB2338110B (en) | 2002-08-28 |
DE69928517T2 (en) | 2006-08-10 |
GB0216281D0 (en) | 2002-08-21 |
GB9807924D0 (en) | 1998-06-10 |
CN1304539A (en) | 2001-07-18 |
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