(19)
(11) EP 0 392 113 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.12.1990 Bulletin 1990/52

(43) Date of publication A2:
17.10.1990 Bulletin 1990/42

(21) Application number: 89308668.6

(22) Date of filing: 25.08.1989
(51) International Patent Classification (IPC)5: E03C 1/308, E04H 4/12, A47L 7/00, B08B 9/02
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 10.04.1989 US 335761

(71) Applicant: LEMAKS INDUSTRIES, INC.
Stamford Connecticut 06905 (US)

(72) Inventor:
  • Brzoska, Henry G.
    Stamford Connecticut 06905 (US)

(74) Representative: Taliercio, Antonio et al
ING. BARZANO' & ZANARDO ROMA S.p.A. Via Piemonte, 26
00187 Roma
00187 Roma (IT)


(56) References cited: : 
   
       


    (54) Apparatus for clearing obstructed fluid passageways


    (57) Apparatus for clearing obstructed fluid passageways has a control manifold (10) with first and second inlets (28, 24) to a pressure source and a vacuum source and an inlet/outlet port (42) for connection to the obstructed passageway. An interior chamber (40) is divided into a pressure chamber (34) communicating with the first inlet (28) and a vacuum chamber (32) communicating with the second inlet (24). A displaceable member (62) in alternate positions thereof communicates between the vacuum chamber (32) and said inlet/outlet port (42), and between the pressure chamber (34) and said inlet/outlet port (42). Displacing means (52) moves the displaceable member (62) between its positions thereby connecting the port (42) sequentially to either the pressure chamber (34) or the vacuum chamber (32). This displacing means (52) also simultaneously connects the other of the pressure chamber (34) and vacuum chamber (32) to atmosphere via a porting means (50, 48).







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