GB2011691A - An alarm unit - Google Patents

An alarm unit

Info

Publication number
GB2011691A
GB2011691A GB7847009A GB7847009A GB2011691A GB 2011691 A GB2011691 A GB 2011691A GB 7847009 A GB7847009 A GB 7847009A GB 7847009 A GB7847009 A GB 7847009A GB 2011691 A GB2011691 A GB 2011691A
Authority
GB
United Kingdom
Prior art keywords
alarm
normally
unit
terminals
loud
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.)
Granted
Application number
GB7847009A
Other versions
GB2011691B (en
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.)
SAFT Societe des Accumulateurs Fixes et de Traction SA
Original Assignee
SAFT Societe des Accumulateurs Fixes et de Traction SA
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 SAFT Societe des Accumulateurs Fixes et de Traction SA filed Critical SAFT Societe des Accumulateurs Fixes et de Traction SA
Publication of GB2011691A publication Critical patent/GB2011691A/en
Application granted granted Critical
Publication of GB2011691B publication Critical patent/GB2011691B/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
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation

Abstract

An alarm sensing network comprises a plurality of normally-closed switches (1) connected in series between first and second terminals (B1 and B2) of an alarm unit and a plurality of normally-open switches (2) connected in parallel between the first terminal (B1) and a third terminal (B3) of the alarm unit. In the event of an abnormal condition (i.e. one of the normally- closed switches opening or one of the normally-open switches closing) a warning is raised e.g. by sending a loud-speaker (HP). An abnormal condition is sensed by a current flowing through one of two bridges of series- connected resistors (R17, R18 and R19 or R37, R38 and R39). In each case a current flow through the bridge turns on a transistor (T7 or T9) connected to turn on a transistor T8 which supplies power to an alarm sounding circuit including the loud-speaker (HP). The second and third terminals are connected to the rest of the unit via diodes (D6 and D7); A plurality of alarm units may have their corresponding first, second and third terminals interconnected so that they share a common sensing network. The arrangement is such that, even without the diodes, there is little danger of a false alarm at one unit due to a low battery at another unit. <IMAGE>
GB7847009A 1977-12-29 1978-12-04 Alarm unit Expired GB2011691B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7739597A FR2413732A1 (en) 1977-12-29 1977-12-29 ALARM SET

Publications (2)

Publication Number Publication Date
GB2011691A true GB2011691A (en) 1979-07-11
GB2011691B GB2011691B (en) 1982-10-20

Family

ID=9199470

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7847009A Expired GB2011691B (en) 1977-12-29 1978-12-04 Alarm unit

Country Status (4)

Country Link
DE (1) DE2855772A1 (en)
ES (1) ES476438A1 (en)
FR (1) FR2413732A1 (en)
GB (1) GB2011691B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111221002A (en) * 2018-11-08 2020-06-02 现代自动车株式会社 Rear alarm sensor assembly

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3287717A (en) * 1962-07-30 1966-11-22 Compudyne Corp Static annunciator with acknowledgment and ring back
US3212078A (en) * 1962-10-12 1965-10-12 Honeywell Inc Annunciator apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111221002A (en) * 2018-11-08 2020-06-02 现代自动车株式会社 Rear alarm sensor assembly
CN111221002B (en) * 2018-11-08 2024-03-22 现代自动车株式会社 Rear alarm sensor assembly

Also Published As

Publication number Publication date
FR2413732B1 (en) 1981-10-16
GB2011691B (en) 1982-10-20
DE2855772A1 (en) 1979-07-12
FR2413732A1 (en) 1979-07-27
ES476438A1 (en) 1979-04-01

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee