GB257594A - Improvements in or relating to electromagnetic circuit interrupters or switches - Google Patents

Improvements in or relating to electromagnetic circuit interrupters or switches

Info

Publication number
GB257594A
GB257594A GB20171/26A GB2017126A GB257594A GB 257594 A GB257594 A GB 257594A GB 20171/26 A GB20171/26 A GB 20171/26A GB 2017126 A GB2017126 A GB 2017126A GB 257594 A GB257594 A GB 257594A
Authority
GB
United Kingdom
Prior art keywords
winding
arm
switches
energized
pivoted
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
GB20171/26A
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical Co 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 Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Publication of GB257594A publication Critical patent/GB257594A/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

  • Thermally Actuated Switches (AREA)

Abstract

257,594. Metropolitan-Vickers Electrical Co., Ltd., (Assignees of Hodgkins, C. H.). Aug. 25, 1925, [Convention date]. Electricallytripped switches.- An electromagnetic switch suitable for controlling electric motors has auxiliary contacts which are allowed to operate by the bending of a bimetallic member 15 a predetermined time after the winding 23 has been energized. Energization of the winding 23 by an alternating current first causes the attraction of an armature 2 pivoted at 3 to a. switch arm 4 pivoted at 5, causing the main contacts 6, 7 to close. The other end 11 of the arm 4 also moves but the contact-pin 9 resiliently carried by it is prevented from moving into bridging engagement with two pins 14 till the bimetallic member 15 has bent to the right under the heating effect of current produced inductively in a winding 22 on the core 1 of the electromagnet. The element 15 is of the shape shown in Fig. 2, having a large radiating surface to ensure quick cooling, and narrow portions 20, 21 which become hot quickly and so ensure quick bending. In a modification, the movement of the contactpin 9 may also break the circuit of the winding 22, so that the element 15 cools at once and latches the contact-pin 9 again as soon as the winding 23 is de-energized and the arm 4 moves back.
GB20171/26A 1925-08-25 1926-08-16 Improvements in or relating to electromagnetic circuit interrupters or switches Expired GB257594A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US52267A US1820702A (en) 1925-08-25 1925-08-25 Electromagnetic switch

Publications (1)

Publication Number Publication Date
GB257594A true GB257594A (en) 1927-03-17

Family

ID=21976477

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20171/26A Expired GB257594A (en) 1925-08-25 1926-08-16 Improvements in or relating to electromagnetic circuit interrupters or switches

Country Status (2)

Country Link
US (1) US1820702A (en)
GB (1) GB257594A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744979A (en) * 1954-09-22 1956-05-08 Allis Chalmers Mfg Co Thermal trip device with pickup coil on an adjustable armature

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2214695A (en) * 1938-03-19 1940-09-10 Westinghouse Electric & Mfg Co Circuit breaker
US2627037A (en) * 1952-04-11 1953-01-27 Morrissette Roger Starting-generating and ignition system for vehicles with automatic cutoff switches
US2980779A (en) * 1958-10-22 1961-04-18 Ranco Inc Motor protector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744979A (en) * 1954-09-22 1956-05-08 Allis Chalmers Mfg Co Thermal trip device with pickup coil on an adjustable armature

Also Published As

Publication number Publication date
US1820702A (en) 1931-08-25

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