EP0506353A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Alarm system
Assignee: Tunstall Telecom Ltd
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Filing: 1992-03-25
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Granted: —
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Expires: 2012-03-25
Abstract
Abstract An alarm system comprises a plurality of alarm units (11), each of which includes means for transmitting an alarm signal containing data indicative of the orientation of the alarm unit; a plurality of roadside receiving units, each of which includes means (10) for receiving alarm signals transmitted from an alarm unit within a certain range, and means (16) for retransmitting a signal to a control centre (6), which includes means from receiving signals transmitted from the receiving units; and means (3, 5) connecting the receiving units to the control centre.
Inventors
- 👤 David c/o Cookson IST Labs Ltd. Huddart
- 👤 Michael Stanley Wappett
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 22:22
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/009; G08G; G08G1/00; G08G1/123; G08G1/127
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
88 words
An alarm system which comprises: (a) a plurality of alarm units, each of which includes means for transmitting an alarm signal containing data indicative of the orientation of the alarm unit; (b) a plurality of roadside receiving units, each of which includes means for receiving alarm signals transmitted from an alarm unit within a certain range, and means for retransmitting a signal; (c) a control centre which includes means from receiving signals transmitted from the receiving units; and (d) means connecting the receiving units to the control centre.
Claim 2
Dependent Claim
21 words
An alarm system as claimed in claim 1 in which the signal transmitted by the receiver is the received alarm signal.
Claim 3
Dependent Claim
26 words
An alarm system as claimed in claim 1 in which the signal transmitted by the receiver is a further signal derived from the received alarm signal.
Claim 4
Dependent Claim
33 words
An alarm system as claimed in any one of claims 1 to 3 which includes means for analysing the orientation data of the alarm signal or signal derived from the received alarm signal.
Claim 5
Dependent Claim
23 words
An alarm system as claimed in claim 4 in which the means for analysing the orientation data is provided in the receiving unit.
Claim 6
Dependent Claim
23 words
An alarm system as claimed in claim 4 in which the means for analysing the orientation data is provided in the control centre.
Claim 7
Dependent Claim
30 words
An alarm system as claimed in any one of claims 1 to 6 in which the orientation data is derived from a flux gate transducer incorporated in the alarm unit.
Claim 8
Dependent Claim
22 words
An alarm system as claimed in any one of claims 1 to 7 in which the alarm signal is a radio signal.
Claim 9
Dependent Claim
22 words
An alarm system as claimed in any one of claims 1 to 8 in which each alarm unit incorporates a non-directional aerial.
Claim 10
Dependent Claim
22 words
An alarm system as claimed in any one of claims 1 to 9 in which each receiving unit incorporates an omni-directional aerial.
Claim 11
Dependent Claim
25 words
An alarm system as claimed in claim 9 in which the non-directional aerial is incorporated in a keyring that forms part of the alarm unit.
Claim 12
Dependent Claim
29 words
An alarm system as claimed in any one of claims 1 to 10 in which the alarm unit is mounted on a vehicle for operation from within the vehicle.
Claim 13
Dependent Claim
30 words
An alarm system as claimed in any one of claims 1 to 12 in which each alarm unit is precoded with identity data that is unique to that alarm unit.
Claim 14
Dependent Claim
28 words
An alarm system as claimed in any one of claims 1 to 13 which includes display means for displaying confirmation that an alarm signal has been properly transmitted.
Claim 15
Dependent Claim
19 words
An alarm system as claimed in claim 14 in which the display means is provided on each receiving unit.
Claim 16
Dependent Claim
30 words
An alarm system as claimed in any one of claims 1 to 15 in which the receiving units are incorporated into or adjacent to the housings of roadside emergency telephones.
References Cited (Backward Citations)
US3986119A
Cited
FR2262836A1
Cited
US4002983A
Cited
FR2348536A1
Cited
DE3830301A1
Cited
DE4004816A1
Cited
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