GB823881A - Electrical fail-safe system - Google Patents

Electrical fail-safe system

Info

Publication number
GB823881A
GB823881A GB14505/57A GB1450557A GB823881A GB 823881 A GB823881 A GB 823881A GB 14505/57 A GB14505/57 A GB 14505/57A GB 1450557 A GB1450557 A GB 1450557A GB 823881 A GB823881 A GB 823881A
Authority
GB
United Kingdom
Prior art keywords
signal
supply
switch
capacitor
fail
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
GB14505/57A
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.)
Scully Signal Co
Original Assignee
Scully Signal 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
Application filed by Scully Signal Co filed Critical Scully Signal Co
Publication of GB823881A publication Critical patent/GB823881A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B23/00—Alarms responsive to unspecified undesired or abnormal conditions
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B9/00—Safety arrangements
    • G05B9/02—Safety arrangements electric

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electronic Switches (AREA)

Abstract

823,881. Electric fail-safe systems. SCULLY SIGNAL CO. May 7, 1957 [May 8, 1956], No. 14505/57. Class 40 (1). An electrical fail-safe system as disclosed in Specification 793,511 in which a principal signal is modified by a periodic checking signal which is extracted and used to monitor the system is described and the monition relates to the detector means. This comprises a switch responsive to the periodic signal and making alternately to connect a capacitor to a D.C. supply or to a load relay in series with the supply, the relay being energized only by the higher voltage thus applied and being slow-torelease, thus holding as long as the repetitive checking signal continues. The D.C. may be obtained from a conventional single wave R.C. smoothed A.C. supply. The responsive switch RY1 connects storage capacitor C1 to the D.C. supply in the position shown, and thus B, C, D, F are made to series the supply, the capacitor and the load relay RY2. The checking signal can be obtained by switch 3, ganged to RY1, interrupting the principal signal.
GB14505/57A 1956-05-08 1957-05-07 Electrical fail-safe system Expired GB823881A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US583569A US2807010A (en) 1956-05-08 1956-05-08 Fail-safe apparatus and technique

Publications (1)

Publication Number Publication Date
GB823881A true GB823881A (en) 1959-11-18

Family

ID=24333643

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14505/57A Expired GB823881A (en) 1956-05-08 1957-05-07 Electrical fail-safe system

Country Status (2)

Country Link
US (1) US2807010A (en)
GB (1) GB823881A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL291388A (en) * 1962-09-28 1900-01-01
US4422067A (en) * 1981-10-05 1983-12-20 Honeywell Inc. Dynamic self-checking safety circuit means
US5175413A (en) * 1990-07-31 1992-12-29 Whirlpool Corporation Fail-safe relay drive system for cooking apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643370A (en) * 1951-03-26 1953-06-23 Westinghouse Air Brake Co Electric circuit checking equipment
US2736882A (en) * 1952-07-18 1956-02-28 Westinghouse Air Brake Co Circuit integrity checking system

Also Published As

Publication number Publication date
US2807010A (en) 1957-09-17

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