GB2212959A - Burglar alarm - Google Patents
Burglar alarm Download PDFInfo
- Publication number
- GB2212959A GB2212959A GB8727469A GB8727469A GB2212959A GB 2212959 A GB2212959 A GB 2212959A GB 8727469 A GB8727469 A GB 8727469A GB 8727469 A GB8727469 A GB 8727469A GB 2212959 A GB2212959 A GB 2212959A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alarm
- primary
- burglar
- window
- burglar alarm
- 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.)
- Withdrawn
Links
- 235000014676 Phragmites communis Nutrition 0.000 claims description 5
- 230000005236 sound signal Effects 0.000 claims description 5
- 230000000063 preceeding effect Effects 0.000 claims 4
- 230000000007 visual effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 description 5
- 238000005034 decoration Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
Abstract
A burglar alarm (10) in which the amount of wiring required is minimised comprises at least one primary alarm (12), and at least one secondary alarm (14) which can, for example, be located at the doors and windows of premises. The primary alarm(s) (12) can be either mains or battery operated and includes a microphone (16). The secondary alarm(s) (14) includes a siren (28) which when actuated causes the primary alarm(s) to function. The secondary alarm(s) may comprise a red switch and magnets (34, 36) positioned adjacent a door or window (32, 38), or may comprise a free-standing person detector using heat or infra-red beams. <IMAGE>
Description
IMPROVEMENTS IN OR RELATING TO BURGLAR ALARMS
The present invention relates to burglar alarms and in particular, though not exclusively, to burglar alarms for domestic premises in -which the need for wiring is reduced to a minimum or eliminated altogether.
In many burglar alarm systems, sensors or detectors at windows or doors are wired to a central alarm. Such an arrangement requires the laying of wires from the detectors from many locations in a house to the central alarm. Clearly this involves considerable time in laying the wires, securing them and drilling holes through walls, which can result in disturbing the interior decoration of the house. Also the installation costs are relatively high.
The present invention seeks to provide a burglar alarm in which the wiring is eliminated or reduced to a minimum.
Accordingly the present invention provides a burglar alarm comprising at least one primary alarm and one or more secondary alarms, the or each secondary alarm being positioned within premises, preferably adjacent a door or window of premises, the primary alarm being operated by an audio signal generated by one or more of the secondary alarms.
The or each secondary alarm can comprise a battery operated signal generator secured to a window or door frame, the secondary alarm -being operated when the door or window is opened.
The or each secondary alarm can be actuated by means of a reed switch which is closed by means of a magnet on the door or window being moved away from a magnet attached to the secondary alarm.
The or each secondary alarm can have a security lock so that the secondary alarm can be energised or de-energised.
In the case where a window comprises a number of movable openings, the window can have a single secondary alarm connected to each opening portion so that the secondary alarm will be operated upon opening of any of the window portions.
The primary alarm can comprise a microphone adapted to detect a pre-determined frequency or small range of frequencies and arranged so that the output from the microphone will actuate a primary warning, for example, a siren. The output from the microphone can also be arranged to operate any other form of warning, for example, lights or a telephone at a police station, or a combination of any of these warnings.
The primary alarm can be mains operated and can include a sound level meter together with a light to indicate that the primary alarm is energised, and a further light to indicate that the primary alarm is operating.
The present invention will now be more particularly described with reference to the accompanying drawing which shows diagrammatically one form of burglar alarm according to the present invention.
Referring to the drawing, a burglar alarm 10 comprises a primary alarm 12 and a number of secondary alarms 14, only one of which is shown. The primary alarm 12 is either mains or battery operated and comprises a microphone 16, light 18, 19 and 20 and a sound level meter 21, together with a siren 22. The siren 22 is positioned on an external wall 24 of premises and the primary alarm 12 can be positioned at any convenient location internally of the premises.
The light 19 indicates that the mains supply is switched on, the light 20 indicates that the alarm is in an operational state, and the light 18 indicates that a secondary alarm signal has been detected and the siren 22 is operating.
Each secondary alarm 14 comprises a battery powered audio signal generator 26 which includes a siren 28, a security lock 30 and an internal reed switch (not shown). In the drawing the secondary alarm 14 is attached to the fixed portion 32 of a window frame and a magnet 34 is attached to the casing of the secondary alarm.
Another magnet 36 is attached to the movable portion 38 of a window and the proximity of the magnets 34 and 36 maintains the reed switch of the alarm 14 in the open position.
Once the security lock is operated to energise the secondary alarm 14, when the window is opened, the magnets 34 and 36 are no longer adjacent one another and the reed switch will close, thereby causing the alarm 14 to generate an audio signal from the siren 28.
This audio signal is detected by the microphone in the primary alarm 12 and the output from the microphone actuates the siren 22.
The output from the microphone as well as or instead of can be arranged to operate other warning systems such as floodlights and a telephone at a nearby police station.
Secondary alarms can be positioned at each window opening and door opening of a premises.
In the case of a window having a number of openings, a single secondary alarm can be used for that window but can be wired to each of the openings so that, upon any of the openings being operated, the secondary alarm will function. It will be appreciated that in this latter case only a relatively insignificant amount of wiring is involved.
It will be readily appreciated that the installation of a burglar alarm according to the present invention and as above described is a relatively simple matter compared with an installation which requires a wired connection between each of the secondary alarms and the primary alarm. All that is involved is the attachment of each secondary alarm to a window or door frame and the attachment of the associated magnets to the doors and windows. The installation of the primary alarm will only require a small hole drilled through an external wall and securing of the siren to the wall. The primary alarm will only need positioning adjacent a mains supply.
A burglar alarm according to the present invention can be installed relatively quickly and with less expense than compared to a wired installation and will not disturb or upset the interior decoration of the premises.
The microphone of the primary alarm is tuned so that it will only operate the warning alarm at a pre-set frequency or small range of frequencies so that ordinary everyday sounds will not operate the primary alarm.
As well as the secondary alarm being in the form described above, it can also be in the form of a free standing alarm which once energised will function upon the detection of the presence of a person in a room, for example, by heat sensing or infra red beams.
Such an alternative alarm can also be attached to a ceiling or wall, preferably adjacent a mains supply, although the alarm can be battery powered. The sensors or detectors can be built in to the alarm. The secondary alarm can also be in the form of a personal portable alarm. If necessary, particularly in the case of large premises, more than one primary alarm can be provided.
Claims (11)
1. A burglar alarm comprising at least one primary alarm and one
or more secondary alarms, the or each secondary alarm being
positioned within premises, preferably adjacent a door or
window of the premises, the primary alarm being operated by
an audio signal generated by one or more secondary alarms.
2. A burglar alarm is claimed in claim 1 in which the or each
secondary alarm comprises a battery operated signal generator
secured to a window or door frame, the secondary alarm being
operated when the door or window is open.
3. A burglar alarm is claimed in claim 1 or claim 2 in which the
or each secondary alarm can be actuated by means of a reed
switch closable by means of a magnet on the door or window,
being mnoved away from a magnet attached to the or each
secondary alarm.
4. A burglar alarm as claimed in any one of the preceeding
claims in which the or each secondary alarm includes a
security lock and enabling the or each secondary alarm to be
energised or de-energised.
5. A burglar alarm is claimed in any one of the preceeding
claims in which there is provided a single secondary alarm
connected to one opening portion of a window having a number
of openings, the secondary alarm being operable upon opening
of any of the said window portions.
6. A burglar alarm as claimed in any one of the preceeding
claims in which the primary alarm comprises a microphone
adapted to detect a pre-determined frequency or range of
frequencies and arranged so that the out-put of the
microphone will actuate a primary warning.
7. A burglar alarm as claimed in claim 6 in which the primary
warning is an audible signal.
8. A burglar alarm as claimed in claim 6 in which the primary
alarm comprises a visual signal.
9. A burglar alarm as claimed in claim 6 in which the primary
warning comprises a remotely located telephone, for example,
at a Police Station.
10. A burglar alarm as claimed in any one of the preceeding
claims in which the primary alarm is powered by the mains
voltage supply and includes a sound level indicator and a
light to indicate that the primary alarm is energised and a
further light to indicate that the primary alarm is
operable.
11. A burglar alarm constructed and arranged for use and
operation substantially as herein described and with
reference to the company in drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8727469A GB2212959A (en) | 1987-11-24 | 1987-11-24 | Burglar alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8727469A GB2212959A (en) | 1987-11-24 | 1987-11-24 | Burglar alarm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8727469D0 GB8727469D0 (en) | 1987-12-23 |
| GB2212959A true GB2212959A (en) | 1989-08-02 |
Family
ID=10627445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8727469A Withdrawn GB2212959A (en) | 1987-11-24 | 1987-11-24 | Burglar alarm |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2212959A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2405511A (en) * | 2003-08-22 | 2005-03-02 | Michael Gilber Chetwynd-Talbot | Door alarm enabled by removal of magnetic key |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3973250A (en) * | 1974-11-12 | 1976-08-03 | Uffelman Malcolm R | Acoustically coupled burglar alarm system |
| US4191947A (en) * | 1978-09-06 | 1980-03-04 | Gte Sylvania Incorporated | Intrusion alarm system |
| US4209777A (en) * | 1978-04-04 | 1980-06-24 | Teledyne Industries, Inc. | Non-compromisable intrusion sensor circuit |
-
1987
- 1987-11-24 GB GB8727469A patent/GB2212959A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3973250A (en) * | 1974-11-12 | 1976-08-03 | Uffelman Malcolm R | Acoustically coupled burglar alarm system |
| US4209777A (en) * | 1978-04-04 | 1980-06-24 | Teledyne Industries, Inc. | Non-compromisable intrusion sensor circuit |
| US4191947A (en) * | 1978-09-06 | 1980-03-04 | Gte Sylvania Incorporated | Intrusion alarm system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2405511A (en) * | 2003-08-22 | 2005-03-02 | Michael Gilber Chetwynd-Talbot | Door alarm enabled by removal of magnetic key |
| GB2405511B (en) * | 2003-08-22 | 2006-08-02 | Michael Gilber Chetwynd-Talbot | Door alarm, doorway and use of the alarm |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8727469D0 (en) | 1987-12-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |