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(11) | EP 0 625 615 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(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. |