IL22472A - Floor-drain traps - Google Patents

Description

PATENTS AND DESIGNS ORDINANCE SPECIFICATION s we JOEL Swedish of do hereby declare the nature of this invention and in what manner the same is to be to be particularly described and ascertained in and by the following HL Improvements in floor drain If conventional floor drain traps or wells are installed at low levels relatively to the sewer pipe in the are located in then there is a risk that when the sewer pipe system is for instance in consequence of heavy sewer water will flow backwards up through the trap or well and flood the In buildings having a sewer pipe system composed by relatively narrow particularly houses equipped with sewer pipe risers or trunks of small sections similar risks apply also in respect of wells located in stories above the Those risks are due to the pressure rises which may occur in the system upon occasional overcharges such as if several bath tubs are emptied at the same according to the conventional design where the water emptied from each tub passes through an individual floor also when the nominal of the sewer pipes is of normal size it may occur due to the formation of slurries on the inner pipe the effective section is reduced to such a degree that the outlet water penetrates the apertures of the well strainer flooding the bath room The object of the present invention is to provide a floor draining trap or well designed in such a way that of water therethrough is entirely whereby is eliminated the need of paying attention to the corresponding risk when dimensioning sewer pipe the building and determining the locations of the floor traps or According to this there is provided trap comprising a a removable perforated cove the cover to the along the periphery of the cove and outlet into the at a position spaced from the bottom of the bowl and a valve formed by a flexible disc centrally to the underside of the cover adapted normally to assume a relaxed position in which the perforations in the cover are in communication with the the valve arranged to assume a lifted ition as a of the level in the rising beyond a predetermined normal as to seal tho perforations the When the valve member is in its closed position the floor a closed involves that when the water is let out a bath tub connected to the there will inside the be built up a static corresponding to the difference between the free level in tho bath tub and the level inside the Under the influence of that static pressure the tub is emptied rapidly also in such cases when pipe connecting the the riser is of narrow and does not slope towards the riser or receiving trunk According to a preferred of the by a bowl turned upside and suitably centrally secured to the well strainer It has been fouad preferable to manufacture the bovjl is to be understood that any suitable material could be the bowl assumes a position in which the major portion thereof is spaced from the apertures in the well cover and the rim of the bowl is located somewhat above the water surface in the If that water surface then the air entrapped in the bowl will be compressed so that the bowl bottom is forced into sealing engagement with the well In order to guarantee a complete sealing it is recommendable to provide on the under surface of the well cover a number of annular or ing the zone in which the cover apertures are located and acting as valve seats of comparatively small contact surfaces so that a high contact pressure between them and the valve member is One embodiment of the invention will now be described in greater reference being made to the accompanying drawing in Figure 1 is an elevational view of a floor draining trap or well designed according to this and Figure 2 shows on a reduced scale the floor well installed in a bath room and connected to the outlet pipe from the bath The floor well shown in Figure 1 does in the tional manner consist of a comparatively deep bowl 10 which tapers downwards and in which is submerged the downwardly bent portion 11 of a sewer pipe connection 12 so that a drain trap is the free water surface is at level 13 Reference numeral 1 designates a perforated well cover or strainer held in position by spring members 1 In accordance witn this invention a rubber body shaped like a circular bowl 18 turned upside down and having a flexible plane bottom has been secured to the underside of the well cover by means of a bolt 16 and a washer 17 Outside the zone comprising the or 19 there project from the lower side of cover 14 two concentric annular flanges 20 21 the bottom surfaces of which are preferably thereby forming comparatively sharp A sealing ring 22 is disposed between cover 14 and well If for some reason there would be a flow of water into the floor in connection with an overcharge of the sewer the water level inside the well will When the free water surface has reached the rim of rubber bowl the air inside the bowl will be entrapped there by the rising Upon continued rise of the water level the entrapped air will be thereby forcing the resiliently flexible bottom of rubber bowl 18 into contact with flanges 20 and When contact has been established the communication between the interior space of the well and the ambient has been effectively As is easily this means that the water is prevented from passing through the well cover apertures which would otherwise occur upon further rise of the water It is also apparent that a floor designed according to the present invention can be installed at low levels relatively to the sewer pipe system in the in without any risk of and flooding upon overcharge of the pipe system in consequence of heavy Turning now to Figure 2 the floor well shown there is mounted in a corresponding recess in the floor of a bath The well is connected to a vertical riser 23 via a horizontal branch pipe 4 suitably consisting of a plastic tube of comparatively small When the bath tub is emptied the water level inside the well will rise due to the flow resistance offered by the narrow tube 24 so that rubber bowl 18 is brought into engagement the well cover as above described thus preventing water from flowing through the perforations therein and flooding the In the closed space inside the well there will then be built up a relatively great static pressure corresponding to the vertical distance between the free surface in the bath tub and that in the Under the influence of that static pressure water will at great speed traverse the narrow pipe a floor well designed according to this invention will exhibit the additional advantage of making its branch pipe insufficientOCRQuality

Claims (1)

1. CLAIMS A trap comprising a having a perforated cove means for sealing the cover to the along the periphery of and outlet opening into the bowl at a position spaced bottom of the bowl and a valve member formed by a flexible disc secured centrally to the underside of cover and adapted normally to assume position i which the perforations the cover are in communication with the the valve member being arranged to a lifted position as a result of water level in the bowl rising beyond a predetermined normal so as to seal the perforations A trap as claimed in claim in which the member is formed as a the bottom of which is secured to the A trap as claimed in claim 1 or in which a plurality of flanges surrounding the perforations project from the cover towards the bottom of the collecting bowl to form seats for valve A trap as claimed in claim which the flanges have tapered ends forming A trap as claimed in any one of the preceding in the valve member is composed of rubber or synthetic A trap substantially as hereinbefore described with re to the accompanying For the Applicants insufficientOCRQuality