(19)
(11) EP 0 346 152 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.10.1990 Bulletin 1990/40

(43) Date of publication A2:
13.12.1989 Bulletin 1989/50

(21) Application number: 89305902.2

(22) Date of filing: 12.06.1989
(51) International Patent Classification (IPC)4: G08B 17/10
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 10.06.1988 GB 8813811

(71) Applicants:
  • Cairney, James
    Brownsburn Industrial Estate Airdrie ML6 9SE (GB)
  • Bryce, Alex Peacock
    Brownsburn Industrial Estate Airdrie ML6 9SE (GB)
  • Murray, Melvin Ingram
    Brownsburn Industrial Estate Airdrie ML6 9SE (GB)

(72) Inventors:
  • Cairney, James
    Airdrie ML6 9SE (GB)
  • Williams, Simon Rushbrook Microelectr. Educ.
    Paisley PA1 2BX (GB)

(74) Representative: Fitzpatrick, Alan James et al
Fitzpatricks, 4 West Regent Street
Glasgow G2 1RS, Scotland
Glasgow G2 1RS, Scotland (GB)


(56) References cited: : 
   
       


    (54) Smoke detector devices and detector circuit


    (57) 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.







    Search report