GB1307525A - Electrical switches - Google Patents

Electrical switches

Info

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
Application number
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Publication of GB1307525A publication Critical patent/GB1307525A/en
Expired legal-status Critical Current

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.
GB1307525D 1969-04-11 1969-04-11 Electrical switches Expired GB1307525A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006094710A1 (en) * 2005-03-09 2006-09-14 Thermik Gerätebau GmbH Run-on switch

Cited By (1)

* Cited by examiner, † Cited by third party
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