(19)
(11) EP 0 430 721 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.08.1992 Bulletin 1992/35

(43) Date of publication A2:
05.06.1991 Bulletin 1991/23

(21) Application number: 90313119.1

(22) Date of filing: 03.12.1990
(51) International Patent Classification (IPC)5: F24F 7/00, F24F 13/14, E05F 15/04
(84) Designated Contracting States:
AT BE CH DE DK FR GB IT LI LU NL SE

(30) Priority: 01.12.1989 GB 8927215

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

(72) Inventors:
  • Pothecary, David Richard
    Rowlands Castle, Hampshire PO9 6EQ (GB)
  • Cawte, Trevor Leonard
    Fareham, Hampshire PO15 6LQ (GB)

(74) Representative: Hughes, Brian Patrick et al
Graham Watt & Co. Riverhead
Sevenoaks, Kent TN13 2BN
Sevenoaks, Kent TN13 2BN (GB)


(56) References cited: : 
   
       


    (54) Ventilators


    (57) A controllable, hinged flap ventilator having a frame (10) defining a ventilation opening (11), one or a pair of outwardly opening flaps (13) hinged to the frame and movable between a closed position closing the ventilation opening and an open position opening the ventilation opening, a flap opening spring or springs (40) for opening the flap or flaps, a fluid operable piston and cylinder unit (22) mounted on the frame and operable to close the or a hinged flap of the ventilator against the action of the spring or springs upon instroking of its piston via first (34) and second (36) flexible connection members connected respectively to the hinged flap and to the unit at one end and a pair of drivingly interconnected rotatable drums (30,31) mounted on the frame and windably receiving the other ends of the flexible connection members, the drum receiving the first flexible connection member (34) connected with the piston and cylinder unit having a diameter less than the diameter of the drum receiving the second flexible connection member (36) connected with the hinged flap.






    Search report