GB1307525A - Electrical switches - Google Patents
Electrical switchesInfo
- Publication number
- GB1307525A GB1307525A GB1307525DA GB1307525A GB 1307525 A GB1307525 A GB 1307525A GB 1307525D A GB1307525D A GB 1307525DA GB 1307525 A GB1307525 A GB 1307525A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- heat sink
- coil
- time
- energized
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
- H01H43/30—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action
- H01H43/301—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the expansion or contraction of a material
- H01H43/302—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the expansion or contraction of a material of solid bodies
- H01H43/304—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the expansion or contraction of a material of solid bodies of two bodies expanding or contracting in a different manner, e.g. bimetallic elements
Landscapes
- Control Of Temperature (AREA)
Abstract
1307525 Switching systems SMITHS INDUSTRIES Ltd 26 March 1970 [11 April 1969] 18826/69 Heading H2H [Also in Division H1 A thermal delay device comprises a heat sink 11, an electric heating coil 15 and a bimetal switch 10, the coil, when energized, heating the heat sink to a temperature substantially in excess of the operating temperature of the bimetal switch whereby the switch remains closed for some time after the heating coil is deenergized. The heat sink has low thermal capacity but considerable lagging 19 to reduce the rate of loss of heat. While the coil is energized a thermostat 16 in series with the coil 15 maintains the temperature of the heat sink at about 150‹ C. whereas the bimetal switch 10 closes at 40‹ C. The delay switch is associated with a light switch 18, e.g. in a bathroom. A fan motor 12 is energized a short while after the switch 18 is closed and remains so for some time after it is opened. The light may be in series or parallel with coil 15. A second pole of switch 18 may be connected to energize the fan motor immediately. In a modification (Fig. 2, not shown) the thermostat 16 is omitted; the time for which switch 10 remains closed then depends on the heat supplied to the heat sink 11, i.e. the time for which the external switch (23) is closed. This embodiment is applied to control of a car windscreen demister. The space inside heat sink 11 may be filled with air or oil.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1882669 | 1969-04-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1307525A true GB1307525A (en) | 1973-02-21 |
Family
ID=10119078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1307525D Expired GB1307525A (en) | 1969-04-11 | 1969-04-11 | Electrical switches |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1307525A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006094710A1 (en) * | 2005-03-09 | 2006-09-14 | Thermik Gerätebau GmbH | Run-on switch |
-
1969
- 1969-04-11 GB GB1307525D patent/GB1307525A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006094710A1 (en) * | 2005-03-09 | 2006-09-14 | Thermik Gerätebau GmbH | Run-on switch |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |