Patent ID: 8439078

Claim:
An odour trap intended for installing in a pipe to a drain, the odour trap comprising: a substantially tubular element ( 1 ) which has substantially the same shape and size of flow cross-section as the pipe to the drain, and a blocking means ( 2 ), the blocking means ( 2 ), after the installing of the odour trap in the pipe, for closing the flow cross-section of the pipe to prevent gas from passing upwards in the pipe past the odour trap, runs in the flow direction downwards in the pipe from a first longitudinal wall section ( 3 ) of the tubular element to a second longitudinal wall section ( 4 ) thereof located opposite to said first longitudinal wall sections ( 3 ), wherein the blocking means ( 2 ) is at least partly shiftable by liquid flowing in the odour trap to, initially at a lowest portion ( 5 ) of the blocking means in the flow direction, allow the liquid to pass downwards in the pipe past the odour trap and to, when the liquid has passed, return to the position which closes the flow cross-section of the pipe, wherein the tubular element ( 1 ) of the odour trap is made of inelastic material and the blocking means ( 2 ) disposed in the tubular element is made of elastically deformable material, the blocking means ( 2 ) comprising a blocking portions ( 8 ) and a fitting portion ( 6 ) removably connected to a fitting portion ( 7 ) of the tubular element ( 1 ), the fitting portion ( 7 ) of the tubular element ( 1 ) consisting a spigot ( 12 ) in the longitudinal direction of the tubular element ( 1 ), the fitting portion ( 6 ) of the blocking means ( 2 ) constituting a wall section ( 20 ) which abuts sealingly against the inside of the tubular element ( 1 ), is substantially tubular in the lower portion as viewed in the flow direction, and is provided with a duct ( 21 ) running in the longitudinal direction of the tubular element ( 1 ) and intended for slipping onto the spigot ( 12 ), the blocking portion ( 8 ) of the blocking means ( 2 ) being integral along the whole of its contour, via a peripheral edge ( 9 ), with the fitting portion ( 6 ) of the blocking means, wherein when in the position which closes the flow cross-section of the pipe the blocking portion ( 8 ) abuts via the peripheral edge ( 9 ) gastightly against the inside of the tubular element ( 1 ), and wherein depending on the flow of liquid downwards in the pipe past the odour trap, at least one of the blocking portion ( 8 ) and the fitting portion ( 6 ) of the blocking means ( 2 ) is to a varying degree shiftable by the liquid towards said first longitudinal wall section ( 3 ) of the tubular element ( 1 ) to allow the liquid to pass between the peripheral edge ( 9 ) of the blocking portion and the inside of the tubular element and between an outside of any shifted parts of the fitting portion of the blocking means and the inside of the tubular element.