GB925695A - Improvements in and relating to contact arrangements for electrical switches, especially for thermostats - Google Patents

Improvements in and relating to contact arrangements for electrical switches, especially for thermostats

Info

Publication number
GB925695A
GB925695A GB3466160A GB3466160A GB925695A GB 925695 A GB925695 A GB 925695A GB 3466160 A GB3466160 A GB 3466160A GB 3466160 A GB3466160 A GB 3466160A GB 925695 A GB925695 A GB 925695A
Authority
GB
United Kingdom
Prior art keywords
contact
contacts
switch
sparking
increase
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
GB3466160A
Inventor
George Ronald Shepherd
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.)
H M C OF HARTFORD Ltd
Original Assignee
H M C OF HARTFORD Ltd
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 H M C OF HARTFORD Ltd filed Critical H M C OF HARTFORD Ltd
Priority to GB3466160A priority Critical patent/GB925695A/en
Publication of GB925695A publication Critical patent/GB925695A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position

Landscapes

  • Thermally Actuated Switches (AREA)

Abstract

925,695. Thermal switches. H. M. C. OF HARTFORD Ltd. Sept. 5, 1961 [Oct. 10, 1960], No. 34661/60. Class 38 (5). In a slow break electric switch the fixed contact 7 is mounted on a pair of spaced heatexpansible metal members 8, 9 arranged to deflect the contact if heated differentially, the electrical connection to the contact 7 being made through one member 8 only with the result that on engagement of contacts 3, 7 resistance heating expands the member 8 and deflects the contact 7 downwards to increase contact pressure ; likewise, on breaking of the contacts, rapid cooling increases the contact separation. The effect is to reduce sparking at the contacts. Heating of the contacts due to sparking or high contact resistance does not affect the operation of the switch since both members 8, 9 are then heated equally. The switch shown is operated by a plunger 2 connected to a suitable thermal element. In a modification (Fig. 2, not shown), the fixed contact assembly is applied to a snapaction switch in order to reduce or increase its temperature differential.
GB3466160A 1960-10-10 1960-10-10 Improvements in and relating to contact arrangements for electrical switches, especially for thermostats Expired GB925695A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3466160A GB925695A (en) 1960-10-10 1960-10-10 Improvements in and relating to contact arrangements for electrical switches, especially for thermostats

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3466160A GB925695A (en) 1960-10-10 1960-10-10 Improvements in and relating to contact arrangements for electrical switches, especially for thermostats

Publications (1)

Publication Number Publication Date
GB925695A true GB925695A (en) 1963-05-08

Family

ID=10368403

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3466160A Expired GB925695A (en) 1960-10-10 1960-10-10 Improvements in and relating to contact arrangements for electrical switches, especially for thermostats

Country Status (1)

Country Link
GB (1) GB925695A (en)

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