(19)
(11) EP 0 430 720 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.09.1992 Bulletin 1992/36

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

(21) Application number: 90313118.3

(22) Date of filing: 03.12.1990
(51) International Patent Classification (IPC)5: F24F 7/00, F24F 13/14, E05F 1/10
(84) Designated Contracting States:
AT BE CH DE DK FR GB IT LI LU NL SE

(30) Priority: 01.12.1989 GB 8927216

(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)
  • Hinks, David
    Fareham, Hampshire PO16 9RZ (GB)
  • Warnes, Terrence Raymond
    Havant, Hampshire PO9 5NL (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) Improvements relating to ventilators


    (57) A sprung to open hinged flap ventilator having an opening spring (40) in the form of a linearly extendible strut the effective radius of action of which increases as the flap is moved from its closed to its fully open position, the strut being composed of a series of springs (40) of different linear spring rates.






    Search report