GB519150A - Electric relays or switches with time lag devices - Google Patents

Electric relays or switches with time lag devices

Info

Publication number
GB519150A
GB519150A GB2986538A GB2986538A GB519150A GB 519150 A GB519150 A GB 519150A GB 2986538 A GB2986538 A GB 2986538A GB 2986538 A GB2986538 A GB 2986538A GB 519150 A GB519150 A GB 519150A
Authority
GB
United Kingdom
Prior art keywords
mercury
circuit
gas
heater
vessel
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
GB2986538A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2986538A priority Critical patent/GB519150A/en
Publication of GB519150A publication Critical patent/GB519150A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H29/00Switches having at least one liquid contact
    • H01H29/28Switches having at least one liquid contact with level of surface of contact liquid displaced by fluid pressure

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Furnace Details (AREA)

Abstract

519,150. Mercury switches. MESTITZ, E. (Drahonovsky, P.). Oct. 14, 1938, No. 29865. [Class 38 (v)] In a short-time switching arrangement suitable for staircase lighting &c. depression of a push button 23 completes the circuit to a heating coil 9 in a gas-chamber 1, the consequent expansion of gas causing the movement of mercury in an M-shaped tube connecting the chamber 1 to a chamber 2 so that contacts 12, 13 in the load circuit are bridged at 5. In the form shown in Fig. 1 the heating circuit includes the coil 20 of an electromagnetic relay which by attracting a core 18 short-circuits the push button 23 and maintains the heating circuit closed after the push button is released. After a certain time the mercury descends so as to break at 4 the circuit to the heater 9 and coil 20. The gas in 1 now cools, the mercury moves back but the heating circuit is not again completed since the maintaining circuit is now broken. Eventually the mercury reaches its original level and the circuit to the load 22 is broken at 5. In a modification, Fig. 2, the electromagnetic relay 20 is replaced by a thermal relav mounted in the vessel 2. Depression of a button 23 completes the circuit to the heater 9. The consequent movement of mercury forces the gas in the vessel 2 through a hole 29 and forces mercury in a vessel 28 to move up a narrow funnel 25 to bridge contacts 26, 27 in a maintaining circuit, Further pressure causes bubbles of gas to pass by the bubble of mercury held in the funnel 25. When mercury in the bulb 1 has sunk so as to break the heater circuit at 4 the gas in 1 contracts, and the mercury at 25 falls so as to break the maintaining circuit. Subsequent reunion of the mercury at 4 cannot now remake the heater circuit, so that cooling continues till the load circuit is broken at 5. The amount of mercury in the vessels 1 and 2 may be adjusted by pouring some of it into a side tube 11.
GB2986538A 1938-10-14 1938-10-14 Electric relays or switches with time lag devices Expired GB519150A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2986538A GB519150A (en) 1938-10-14 1938-10-14 Electric relays or switches with time lag devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2986538A GB519150A (en) 1938-10-14 1938-10-14 Electric relays or switches with time lag devices

Publications (1)

Publication Number Publication Date
GB519150A true GB519150A (en) 1940-03-18

Family

ID=10298441

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2986538A Expired GB519150A (en) 1938-10-14 1938-10-14 Electric relays or switches with time lag devices

Country Status (1)

Country Link
GB (1) GB519150A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2484110A (en) * 1945-05-18 1949-10-11 Mestitz Ervin Electric timing relay

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2484110A (en) * 1945-05-18 1949-10-11 Mestitz Ervin Electric timing relay

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