(19)
(11) EP 0 450 222 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.07.1992 Bulletin 1992/31

(43) Date of publication A2:
09.10.1991 Bulletin 1991/41

(21) Application number: 90308705.4

(22) Date of filing: 08.08.1990
(51) International Patent Classification (IPC)5: B08B 3/12
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 03.04.1990 JP 88560/90

(71) Applicant: S & C CO., Ltd
Aikoh-gun, Kanagawa-ken (JP)

(72) Inventor:
  • Yoshihide, Shibano c/o S & C Co, Ltd
    Aikoh-gun Kanagawa-ken (JP)

(74) Representative: Leale, Robin George et al
FRANK B. DEHN & CO. Imperial House 15-19 Kingsway
London WC2B 6UZ
London WC2B 6UZ (GB)


(56) References cited: : 
   
       


    (54) Ultrasonic washing apparatus


    (57) A spray type ultrasonic washing apparatus including a coaxial nozzle structure (1) which comprises inner and outer hollow conical frustums (3,2) for supplying nondeaerated washing liquid (12) by way of the annular passage (7) delimited between the frustums and supplying deaerated washing liquid (11) by way of the inner frustum, thus causing the deaerated washing liquid to be enclosed by nondeaerated washing liquid when spraying on a surface to be washed, so as to isolate the deaerated washing liquid from the surrounding atmosphere and thereby preventing invasion of air into the same. This enables cavitation to be formed effectively in the deaerated washing liquid, thereby increasing washing efficiency.






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