(19)
(11) EP 0 324 256 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.07.1990 Bulletin 1990/27

(43) Date of publication A2:
19.07.1989 Bulletin 1989/29

(21) Application number: 88312092.5

(22) Date of filing: 21.12.1988
(51) International Patent Classification (IPC)4: F24F 13/15, A62C 2/14
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 09.01.1988 GB 8800464
12.01.1988 GB 8800574
18.05.1988 GB 8811793
07.10.1988 GB 8823596

(71) Applicants:
  • COLT INTERNATIONAL HOLDINGS A.G.
    CH-6300 Zug (CH)

    BE CH DE FR IT LI LU NL SE AT 
  • COLT INTERNATIONAL LIMITED
    Havant Hampshire PO9 2LY (GB)

    GB 

(72) Inventors:
  • Green, Charles John George
    Hayling Island Hampshire PO11 0JT (GB)
  • Yeatman, Peter Norris
    Portsmouth Hampshire PO7 6BX (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 in ventilators


    (57) A controllable fire ventilator has opening springs (13) and dual day-to-day controls one of which is a pneumatically operable piston-and-cylinder unit (20) and the other of which is an electro-magnetic device (30) which retains a keeper plate (33) when the device is energised. The unit (20) may be powered to close the ventilator when the ventilator is open, the control cable (22) carrying the keeper plate (33). Fire response may be by means of a fusible link (35). In an alternative arrangement (see Fig. 3), the electro-magnetic device (30) is incorporated into the cylinder (121) of the cylinder unit and the piston (126) carries the keeper plate (33). A fire switch (140) may open in response to an electrically signalling fire detection system, the cylinder unit (120) being exhausted to atmosphere through its power connection (122) by valve means adjustable only upon operation of a sprinkler system, to avoid ventilator opening in response to false alarms.







    Search report