GB805410A - Improvements in or relating to thermally-actuated electric switches - Google Patents

Improvements in or relating to thermally-actuated electric switches

Info

Publication number
GB805410A
GB805410A GB39619/56A GB3961956A GB805410A GB 805410 A GB805410 A GB 805410A GB 39619/56 A GB39619/56 A GB 39619/56A GB 3961956 A GB3961956 A GB 3961956A GB 805410 A GB805410 A GB 805410A
Authority
GB
United Kingdom
Prior art keywords
bimetal
cam
contacts
terminal
strip
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
GB39619/56A
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.)
Bryant Electric Co
Original Assignee
Bryant Electric Co
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
Priority to US556953A priority Critical patent/US2870290A/en
Application filed by Bryant Electric Co filed Critical Bryant Electric Co
Publication of GB805410A publication Critical patent/GB805410A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B1/00Details of electric heating devices
    • H05B1/02Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202Switches
    • H05B1/0213Switches using bimetallic elements
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00Thermally-actuated switches
    • H01H37/02Details
    • H01H37/32Thermally-sensitive members
    • H01H37/52Thermally-sensitive members actuated due to deflection of bimetallic element

Abstract

805,410. Thermal switches; cam-operated switches. BRYANT ELECTRIC CO. Dec. 31, 1956 [Jan. 3, 1956], No. 39619/56. Class 38 (5). The switch comprises a bimetal strip fixed at one end and having its other end co-operating with a fixed contact, spring means mechanically connected with the bimetal and manual means movable from an " off " position to move the spring means a variable amount and to close the contacts, the bimetal being heated by the current through the circuit thus completed. In one form, Figs. 2, 3, the bimetal 54 is mounted on a terminal 56 and carries a contact 58 co-operating with a contact 72 on a composite bimetal strip 66 mounted on a terminal 64. The bimetal 54 is connected by a strip 62 to an ambient temperature compensating bimetal 60 mounted on a lever 76 pivoted at 74 and biased clockwise (Fig. 2) by a spring 80. The lever 76 has an adjusting screw 95 co-operating with a manually-adjustable cam 26 having a projection 52 which in the off " position shown, separates spring blades 14, 16, which are carried by a terminal 10, from terminals 4, 6. In the " off position, the lever 76 engages a lateral projection on the strip 62 to hold contacts 58, 72 open. As the cam is rotated, contacts 4, 6, 14, 16 close, and the lever 76 and bimetal 60 move upwards, Fig. 2, to close contacts 58, 72. The bimetal 66 has two parts 68, 70 which bend down and up, respectively, when heated, and which are in series with the load which is connected between terminals 10 and 64. Thus, as bimetal 66 is heated it tends to increase the contact pressure until the bimetal 54 overcomes the pressure imparted to it via bimetal 60 by the cam 26, and opens the contacts. The bimetals then cool down and the contacts reclose, and the switch cycles on and off. The line terminals are 4, 56, and terminal 6 is connected to the neutral via a pilot lamp. In a modification, Fig. 4, the movements of the bimetals 541, 601 and the strip 62<SP>1</SP> are controlled by a snap-acting spring 222, the contact 58<SP>1</SP> on the bimetal co-operating with a fixed contact 72<SP>1</SP>. The springs 14<SP>1</SP>, 16<SP>1</SP> are carried respectively by terminals 4<SP>1</SP>, 6<SP>1</SP> and co-operate with terminal 101, the springs having projections 212, cooperating with the face of cam 26<SP>1</SP> which has recesses 214 in the " off position. The edge of the cam engages an arm 230 secured to a member 228 carrying the bimetal 60<SP>1</SP>. The bimetal 54<SP>1</SP> is heated by the current through it and by a coil 224.
GB39619/56A 1956-01-03 1956-12-31 Improvements in or relating to thermally-actuated electric switches Expired GB805410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US556953A US2870290A (en) 1956-01-03 1956-01-03 Wiring device

Publications (1)

Publication Number Publication Date
GB805410A true GB805410A (en) 1958-12-03

Family

ID=24223489

Family Applications (1)

Application Number Title Priority Date Filing Date
GB39619/56A Expired GB805410A (en) 1956-01-03 1956-12-31 Improvements in or relating to thermally-actuated electric switches

Country Status (2)

Country Link
US (1) US2870290A (en)
GB (1) GB805410A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3083282A (en) * 1959-07-13 1963-03-26 Stevens Mfg Co Inc Infinite control switch
US3082305A (en) * 1959-07-31 1963-03-19 Proctor Silex Corp Thermal switch construction and system
DE1275705B (en) * 1961-06-02 1968-08-22 Busch Jaeger Duerener Metall Temperature switch
US3688060A (en) * 1970-08-24 1972-08-29 Texas Instruments Inc Electrical switch means for effecting sequential operation
US3863185A (en) * 1973-12-17 1975-01-28 Robertshaw Controls Co Thermal beam actuated electrical sequencer
US3905003A (en) * 1974-01-28 1975-09-09 Robertshaw Controls Co Electrical switch construction and parts therefor
CA2369527C (en) * 2001-01-31 2005-01-04 Robertshaw Controls Company Switching system for plural simmer voltages

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1716041A (en) * 1926-07-30 1929-06-04 R M Hvid Safety switch plug
US1749718A (en) * 1926-12-13 1930-03-04 Edison Electric Appliance Co Electric supply system
US1916671A (en) * 1930-06-16 1933-07-04 American Electrical Heater Co Thermostat
US2131640A (en) * 1934-01-08 1938-09-27 Colt S Mfg Co Automatic circuit breaker
US2338474A (en) * 1940-12-04 1944-01-04 Metals & Controls Corp Thermostat
US2520874A (en) * 1942-10-19 1950-08-29 Fasco Industries Manually operable thermostatic switch assembly
US2427945A (en) * 1942-12-05 1947-09-23 Westinghouse Electric Corp Electric hot plate with vesseltemperature control
US2585068A (en) * 1947-02-28 1952-02-12 Morris B Wood Electrical circuit breaker
US2498127A (en) * 1947-12-01 1950-02-21 Cutler Hammer Inc Thermally responsive switching device
US2593268A (en) * 1948-07-20 1952-04-15 Gen Motors Corp Single-phase motor control
US2623137A (en) * 1950-04-25 1952-12-23 Proctor Electric Co Electric switch
US2685636A (en) * 1951-10-08 1954-08-03 Proctor Electric Co Electric heating unit control

Also Published As

Publication number Publication date
US2870290A (en) 1959-01-20

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