(19)
(11) EP 0 314 201 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.02.1990 Bulletin 1990/06

(43) Date of publication A2:
03.05.1989 Bulletin 1989/18

(21) Application number: 88120252.7

(22) Date of filing: 25.11.1987
(51) International Patent Classification (IPC)4: A62C 2/06
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 25.11.1986 GB 8628112
07.10.1987 GB 8723551

(62) Application number of the earlier application in accordance with Art. 76 EPC:
87310382.4 / 0270297

(71) Applicant: COLT INTERNATIONAL LIMITED
Havant Hampshire PO9 2LY (GB)

(72) Inventors:
  • Tregenna,Brian Charles
    Denmead, Hampshire P07 6NT (GB)
  • Churchill,Richard William,Flat 1
    Ferndown, Dorset (GB)

(74) Representative: Slight, Geoffrey Charles et al
Graham Watt & Co. Riverhead
Sevenoaks Kent TN13 2BN
Sevenoaks Kent TN13 2BN (GB)


(56) References cited: : 
   
       


    (54) Improvements relating to ventilators


    (57) An opening flap ventilator for buildings has pneumatic opening springs (13) and electric motor-gear drive mechanism (14) operable to close the ventilation flap (11). The mechanism has an electrically energised clutch (54) interposed in the gear drive chain (24, 26, 28, 48, 46) (see Fig. 2). On de-energisation of the clutch (54), which may be automatic in response to the detection of a fire condition occuring, the ventilation flap (11) is automatically opened. The flap (11) is subsequently closed by operation of the motor which drives a winch pulley (20) for winding in a single operating cable (76) in opposite directions from a location between its ends. A fused fire prop is provided to prop the flap (11) open in the event of a fire as a safety measure.







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