(19)
(11) EP 0 625 615 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.12.1994 Bulletin 1994/52

(43) Date of publication A2:
23.11.1994 Bulletin 1994/47

(21) Application number: 94303565.9

(22) Date of filing: 18.05.1994
(51) International Patent Classification (IPC)5E03C 1/30
(84) Designated Contracting States:
DE FR IT NL

(30) Priority: 21.05.1993 GB 9310593

(71) Applicant: Song, Andrew Chan Shen
Singapore 1334 (SG)

(72) Inventor:
  • Song, Andrew Chan Shen
    Singapore 1334 (SG)

(74) Representative: Votier, Sidney David 
CARPMAELS & RANSFORD 43, Bloomsbury Square
London WC1A 2RA
London WC1A 2RA (GB)


(56) References cited: : 
   
       


    (54) Drain plunger


    (57) The present invention describes an apparatus for removing blockage in a tubular member with a plunger (10) having a hollow channel and flexible member. The drain plunger comprises a pipe terminating at one end with a cap and the other end a flexible member for exerting pressure on the stagnant fluid in the tubular member. Preferably, the flexible member has a cross sectional area corresponding to the inner diameter of the tubular member. In simplest implementation of the present invention, the flexible member is a flexible disk or washer. When the user exerts pressure on the column of stagnant fluids with the plunger in the tubular member, the compressed air in the hollow channel assists the user in reversing the direction of the plunger and dislodging the plumbing traps in a few reciprocating strokes.







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