(19)
(11) EP 0 272 037 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.03.1989 Bulletin 1989/12

(43) Date of publication A2:
22.06.1988 Bulletin 1988/25

(21) Application number: 87310789.0

(22) Date of filing: 09.12.1987
(51) International Patent Classification (IPC)4: G05D 23/12, E05F 15/20, F24F 11/053
(84) Designated Contracting States:
CH DE FR GB LI

(30) Priority: 13.12.1986 JP 297247/86
23.01.1987 JP 13406/87
12.05.1987 JP 113583/87

(71) Applicant: Uwatoko, Iwao
Kagoshima-shi Kagoshima-ken (JP)

(72) Inventor:
  • Uwatoko, Iwao
    Kagoshima-shi Kagoshima-ken (JP)

(74) Representative: Calderbank, Thomas Roger et al
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)


(56) References cited: : 
   
       


    (54) A thermally responsive actuator


    (57) A thermally responsive actuator comprises a barrel (2) which is disposed in an atmosphere in which temperature changes take place. There is a slidable piston (6) within the barrel (2), and a thermally expansive material (6) sealed in the barrel (2), which causes the piston (6) to slide by thermal expansion and thermal contraction due to temperature changes. An extension rod (8) is secured to the piston (6) which slides together with the piston (6). Spring means (10) between relative slide members within the barrel (2) act to cancel the starting frictional force created on the sliding faces.







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