EP0346152A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Smoke detector devices and detector circuit
Assignee: Bryce Alex Peacock
•
Filing: 1989-06-12
•
Granted: —
•
Expires: 2009-06-12
Abstract
Abstract A smoke detector device comprises a housing (30) adapted to be mounted below an existing ceiling rose fitting (32) and to be clamped to an electrical flex (38) passing therethrough. The housing (30) encloses a smoke detector circuit formed on a printed circuit board (62), a battery (48) and an alarm sounder (50). The device is intended particularly for use in domestic environment, and is intended unobtrusive and inexpensive. An alternative embodiment includes a housing adapted to replace existing ceiling rose fittings; A novel photoelectric-type detector circuit, incorporating an integrated circuit and high intensity light emitting diode, is also described, which again is intended to be compact and inexpensive.
Inventors
- 👤 James Cairney
- 👤 Simon Rushbrook Microelectr. Educ. Williams
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 16:20
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/103; G08B17/107; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
70 words
A smoke detector device which, in use, forms part of a ceiling light fitting, comprising a housing adapted to be mounted adjacent a ceiling and having an aperture in a lower-most surface thereof to allow the passage of an electrical flex therethrough, said housing enclosing smoke detector means and alarm sounder means responsive to said detector means, and said housing being of dimensions comparable to conventional ceiling rose light fittings.
Claim 2
Dependent Claim
70 words
A smoke detector device which, in use, forms part of a ceiling light fitting, comprising a housing adapted to be mounted adjacent a ceiling and having an aperture in a lower-most surface thereof to allow the passage of an electrical flex therethrough, said housing enclosing smoke detector means and alarm sounder means responsive to said detector means, and said housing being of dimensions comparable to conventional ceiling rose light fittings.
Claim 3
Dependent Claim
24 words
A device as claimed in claim 1, wherein said housing is provided with a plurality of apertures whereby smoke may enter the interior thereof.
Claim 4
Dependent Claim
46 words
A device as claimed in claim 1 or claim 2, wherein said housing is formed in a shape similar to that of a conventional ceiling rose light fitting, and is adapted to be secured to a base member of an existing fitting mounted on a ceiling.
Claim 5
Dependent Claim
45 words
A device as claimed in claim 1 or claim 2, wherein said housing comprises a cap portion and a base portion, said base portion being adapted to be affixed to a ceiling and said cap portion being adapted to be secured to said base portion.
Claim 6
Dependent Claim
28 words
A device as claimed in claim 4 wherein said cap and base portions are formed in a shape similar to that of a conventional ceiling rose light fitting.
Claim 7
Dependent Claim
25 words
A device as claimed in claim 1 or claim 2, wherein said housing is adapted to be located below an existing ceiling rose light fitting.
Claim 8
Dependent Claim
42 words
A device as claimed in claim 6, wherein said housing has an upper edge adapted to seat against a bottom surface of the existing fitting and further includes means for securing the housing to an electrical flex depending from the existing fitting.
Claim 9
Dependent Claim
26 words
A device as claimed in claim 7 wherein said securing means comprises a clamp arrangement located adjacent said aperture in said lowermost surface of the housing.
Claim 10
Dependent Claim
41 words
A device as claimed in claim 6, claim 7 or claim 8, wherein said housing is divided into an upper chamber adapted to house a battery and an alarm sounder device, and a lower chamber adapted to house said detector means.
Claim 11
Dependent Claim
45 words
A device as claimed in claim 9, further including means interconnecting the interior of said upper means interconnecting the interior of said upper chamber and the exterior of the housing, whereby sound emitted by said sounder may be communicated to the exterior of the housing.
Claim 12
Independent Claim
35 words
A device as claimed in any preceding claim, wherein said housing is provided with one or more apertures in its lowermost surface adapted to receive visual indicating means associated with said detector and alarm means.
Claim 13
Independent Claim
26 words
A device as claimed in any preceding claim, wherein said housing is further provided with a manual reset button for resetting said detector and alarm means.
Claim 14
Dependent Claim
151 words
A smoke detector device as claimed in any preceding claim, wherein said smoke detector means comprises a detector circuit including a light emitting diode (l.e.d.), a phototransistor responsive to the light emitted by the l.e.d. and means for generating an alarm signal when the output from the phototransistor indicates the presence of smoke, said sounder means being responsive to said output signal; and wherein said circuit is formed on a printed circuit board (p.c.b.) and includes an integrated circuit incorporating a pulse generator, comparator means and means responsive to said comparator means to generate an alarm signal, said l.e.d. being driven by said pulse generator so as to produce periodic light pulses, and means being provided for applying a voltage to an input of said comparator means which is representative of the photocurrent generated by said phototransistor, such that an alarm signal is triggered if said voltage exceeds a predetermined threshold.
Claim 15
Independent Claim
13 words
The device of claim l3, wherein said l.e.d. is a high intensity l.e.d.
Claim 16
Dependent Claim
27 words
The device of claim 14, wherein the means for applying said voltage to the comparator input comprises a single transistor amplifier stage and a diode pump circuit.
Claim 17
Independent Claim
20 words
The device of any of claims 13 to 15, wherein said circuit further includes input voltage conversion and rectifying means.
Claim 18
Independent Claim
22 words
The device of any of claims 13 to 16, wherein a battery provides the main or standby power supply for the circuit.
Claim 19
Independent Claim
56 words
The device of any of claims 13 to 17, wherein said integrated circuit further includes input/output means adapted to provide an output signal when the circuit is triggered and to trigger the circuit in response to an input signal, whereby the circuit may be interconnected with other detector circuits or other components of an alarm system.
Claim 20
Independent Claim
34 words
The device of any of claims 13 to 18, wherein a second l.e.d. is connected to said pulse generator and is located so as to provide a visual indication that the circuit is operational.
Claim 21
Independent Claim
28 words
The device of any of claims 13 to 19, wherein the circuit further includes a third l.e.d. adapted to provide a visual indication when the circuit is triggered.
Claim 22
Independent Claim
16 words
The device of any of claims 13 to 20, wherein said sounder is a piezoelectric sounder.
Claim 23
Dependent Claim
13 words
A smoke detector circuit as defined in any of claims 13 to 21.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.