GB1330714A - Alarms - Google Patents
AlarmsInfo
- Publication number
- GB1330714A GB1330714A GB1330714DA GB1330714A GB 1330714 A GB1330714 A GB 1330714A GB 1330714D A GB1330714D A GB 1330714DA GB 1330714 A GB1330714 A GB 1330714A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waves
- intruder
- transducers
- alarm
- unit
- 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
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
- G08B13/1618—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means
- G08B13/1627—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means using Doppler shift detection circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
1330714 Fire and intruder alarms R A L MOSS 25 Nov 1971 [17 Dec 1970] 60096/70 Heading G4N An intruder or fire alarm comprises a unit capable of being suspended or supported away from the walls, ceiling and floor of a room and having means to generate sound or ultrasonic waves and to radiate the waves in at least a plurality of directions so that the space around the unit is filled with the waves and comprising omnidirectional means to receive reflected waves and to operate an alarm in response to variations in the received reflected waves. The unit may take the form of a spherical casing having holes through which transducers can radiate an ultrasonic wave at 40 kHz and having six receiving transducers equally displayed by 90 degrees, the receiver may include an amplifier tuned to the transmitter frequency, feeding a detector and a low frequency amplifier tuned to amplify signals produced due to movement of an intruder, a trigger circuit which changes state when the output from the low frequency amplifier exceeds a reference level and a normallyenergized alarm-operating relay. Alternatively, the vibrations may be transmitted and received by common transducers or by action of the spherical shell itself.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6009670 | 1971-11-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1330714A true GB1330714A (en) | 1973-09-19 |
Family
ID=10485000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1330714D Expired GB1330714A (en) | 1971-11-25 | 1971-11-25 | Alarms |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1330714A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2299668A (en) * | 1995-04-01 | 1996-10-09 | David Appleby | Fire sensor using ultrasonic sound |
EP2333737A1 (en) | 2009-12-01 | 2011-06-15 | Techem Energy Services GmbH | Hazard warning system with method for recognising objects in the vicinity of same |
DE102006023048C5 (en) * | 2006-05-17 | 2014-12-11 | Techem Energy Services Gmbh | Fire alarm and method for checking its functionality |
-
1971
- 1971-11-25 GB GB1330714D patent/GB1330714A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2299668A (en) * | 1995-04-01 | 1996-10-09 | David Appleby | Fire sensor using ultrasonic sound |
DE102006023048C5 (en) * | 2006-05-17 | 2014-12-11 | Techem Energy Services Gmbh | Fire alarm and method for checking its functionality |
EP2333737A1 (en) | 2009-12-01 | 2011-06-15 | Techem Energy Services GmbH | Hazard warning system with method for recognising objects in the vicinity of same |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |