GB1070468A - Improvements in or relating to alarm annunciators - Google Patents

Improvements in or relating to alarm annunciators

Info

Publication number
GB1070468A
GB1070468A GB44598/63A GB4459863A GB1070468A GB 1070468 A GB1070468 A GB 1070468A GB 44598/63 A GB44598/63 A GB 44598/63A GB 4459863 A GB4459863 A GB 4459863A GB 1070468 A GB1070468 A GB 1070468A
Authority
GB
United Kingdom
Prior art keywords
lamps
lamp
alarm
abnormal condition
diode
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
GB44598/63A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB1070468A publication Critical patent/GB1070468A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/008—Alarm systems in which substations are interrogated in succession by a central station central annunciator means of the sensed conditions, e.g. displaying or registering
    • 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
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station

Abstract

1,070,468. Alarm systems. E. I. DU PONT DE NEMOURS & CO. Nov. 12, 1963 [Nov. 20, 1962], No. 44598/63. Heading G4N. [Also in Division H3] An electrical annunciator comprises two parallel branches across a supply, each having an indicator lamp; means responsive to an abnormal condition at a monitoring point for establishing a predetermined state of illumination of the lamps; and manual means for changing the state of illumination of the second lamp. In one arrangement, Fig. 4, an abnormal condition applies a negative potential on line 50 to cause negative resistance diode 1411 to switch to its conducting state and illuminate lamp 16<SP>11</SP>. At the same time the change in charge on capacitor 55 Switches diode 19<SP>11</SP> to provide a circuit to lamps 20<SP>11</SP>, 20<SP>11</SP>a. The negative circuit 64 to these lamps is completed via a flasher 73, Fig. 5, which also supplies an audible alarm 70. Receipt of an alarm is acknowledged by operating ganged buttons 65, 66 which extinguish lamps 20<SP>11</SP>, 20<SP>11</SP>a and silence the audible alarm. Upon cessation of an abnormal condition the red lamp 16<SP>11</SP> is extinguished and a ringback lamp (78), Fig. 6 (not shown), is lit and the ringback alarm (84), Fig. 5 (not shown), is sounded. These are cancelled by ganged push buttons (87, 89). Further branch circuits comprising a lamp and a negative resistance diode may also be provided to indicate which alarm is " first on," Fig. 7 (not shown). If the abnormal condition ceases before it is acknowledged the lamps 20<SP>11</SP> and 20<SP>11</SP>a remain lit. In a modification, the acknowledge lamps 20111, 20<SP>111</SP>a, Fig. 4, are also extinguished by the OFF signal on line 52. A transistor may be used in place of the diode 49 with the ON and OFF signals applied to its base, Figs. 1-3 (not shown). The negative resistance diodes and lamps may be replaced by neons which serve both purposes, Figs. 8-10 (not shown).
GB44598/63A 1962-11-20 1963-11-12 Improvements in or relating to alarm annunciators Expired GB1070468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US238867A US3254331A (en) 1962-11-20 1962-11-20 Alarm annunciator with independent acknowledgement indication

Publications (1)

Publication Number Publication Date
GB1070468A true GB1070468A (en) 1967-06-01

Family

ID=22899654

Family Applications (1)

Application Number Title Priority Date Filing Date
GB44598/63A Expired GB1070468A (en) 1962-11-20 1963-11-12 Improvements in or relating to alarm annunciators

Country Status (3)

Country Link
US (1) US3254331A (en)
DE (1) DE1449058A1 (en)
GB (1) GB1070468A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3480938A (en) * 1965-02-05 1969-11-25 Beta Corp Annunciator system
US3510771A (en) * 1967-11-15 1970-05-05 Bell Telephone Labor Inc Level detector having visual indicator lock-up means
US3631432A (en) * 1970-01-14 1971-12-28 John Stallebrass Annunciator unit for use in a fault warning system
US4631542A (en) * 1984-09-28 1986-12-23 Cincinnati Microwave, Inc. Police radar warning receiver with mute function

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124793A (en) * 1964-03-10 Annunciator system a
USRE25214E (en) * 1962-07-31 Annunciator system
USRE24031E (en) * 1954-05-17 1955-06-28 Annunciator system
US3029421A (en) * 1958-05-15 1962-04-10 Isi Inc Annunciator system
US3107349A (en) * 1958-10-16 1963-10-15 Scam Instr Corp Annunciator system
US3081449A (en) * 1959-02-19 1963-03-12 Robertshaw Fulton Controls Co Contact annunciator with acknowledgment and master alarm relay
US3084338A (en) * 1960-07-29 1963-04-02 Lockheed Aircraft Corp Master caution light control
US3098953A (en) * 1960-08-01 1963-07-23 Sylvania Electric Prod Time delay circuit

Also Published As

Publication number Publication date
DE1449058A1 (en) 1969-01-02
US3254331A (en) 1966-05-31

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