GB2134940A

GB2134940A - Drainage gully trap

Info

Publication number: GB2134940A
Application number: GB08333108A
Authority: GB
Inventors: Michael Robert Jupp
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-12-15
Filing date: 1983-12-12
Publication date: 1984-08-22
Also published as: GB2134940B; GB8333108D0

Abstract

A floor drainage gully having a top inlet grating 20 comprises an outer casing 10, Fig. 1, defining a chamber 11 having an outlet 13 for connection to a drainage system, the casing 10 also having at its upper end a transverse wall 14 provided with an inlet 15 which is extended by a tube 16 dipping into a cup-like member 17 located within the chamber 11 to form a water trap. A non-return float valve 18 may be provided. Fig. 4 shows a construction where an upward extension of outlet 32 is surrounded by an inverted cup-like member 33 forming a float valve; in a modification dispensing with a float valve the inverted cup-like member is fixed on the underside of the inlet grating. Other modifications disclosed incorporate internal cylindrical gratings. The chamber 11 may, as shown, have an additional drainage inlet 12. <IMAGE>

Description

SPECIFICATION Drainage gully This invention relates to a drainage gully for use in draining liquid from a floor surface.

Drainage gullies which have a water trap usually have an overall height which is greater than the depth of a floor and therefore are only suitable for ground floors where the gully can extend below the bottom of the floor without detriment. Where such gullies are provided in an upper floor, their depth exceeds the height between the floor level and the ceiling located beneath the floor.

The present invention aims to provide a drainage gully having a water trap but which has a relatively small overall height so that it can be installed in a floor space between the floor level and the ceiling disposed below the floor level.

According to the present invention there is provided a drainage gully for use in draining liquid from a floor surface, comprising an outer casing portion defining a chamber having an outlet for connection to a drainage system, said casing portion having at its upper end a transverse wall portion provided with an inlet opening, said inlet opening or said outlet being extended by a tubular portion which extends into a cup-like member located within the chamber and which forms a water trap.

Preferably the transverse wall portion is detachably mounted on the outer casing.

Preferably backflow of water or foul air from the drainage system is prevented by a valve member or float.

Some embodiments of the invention will now be described, by way of examples, with reference to the accompanying drawings, in which: Figure 1 is a vertical cross-section through a first embodiment of a drainage gully according to the present invention, with the valve shown in the raised condition:: Figure 2 is a cross-section similar to that of Figure 1 with the valve shown in the closed condition; Figure 3 is a side elevation, partly in section, of a second embodiment of a drainage gully according to the present invention, with the valve shown in the closed condition; Figure 4 is a vertical cross-section through a third embodiment of a drainage gully according to the present invention, with the float valve shown in the closed condition; Figure 5 is a vertical cross-section through a fourth embodiment of a drainage gully according to the present invention which is not provided with a valve; and Figure 6 is a vertical cross-section through a fifth embodiment of a drainage gully according to the present invention which is not provided with a valve.

The drainage gully shown in Figures 1 and 2 of the drawings is specifically designed for use in draining liquid such as water, from a floor surface but it will be appreciated that it can be used for draining liquid from a surface other than a floor surface. The drainage gully comprises an outer casing 10 defining a chamber 11 and is provided with an inlet 12 and an outlet 13 by which it can be connected to a drainage system. The casing 10 has an upper transverse wall 14 provided with a central inlet opening 1 5 which is extended by a tubular portion 1 6. The tubular portion 16 extends into a cup-like member 1 7 forming a water trap which is located within the chamber 11.Surrounding the upper end of the tubular portion 16 is an annular valve member 1 8 which is located between the upper transverse wall 14 and the upper end of the cup-like member 17. At its upper end the casing 10 has a vertical peripheral wall portion 19 and a removable grating or perforated cover 20. The tubular portion 1 6 is provided with a peripherally extending outwardly directed lip 21.

Starting from the position shown in Figure 2 in which the valve member 1 8 closes the upper end of the cup-like member 1 7 and seals against the lip 21 and against the upper end of the cup-like member 17, any liquid, such as water, which flows through the grating or cover 20 flows over the weir formed by the upper part of the tubular portion 16 through the opening 15 and down the tubular portion 16 into the cup-like member 1 7.

When the cup-like member 1 7 is full of liquid the valve member 18 will be lifted off the cup-like member 17 and lip 21 by the head of liquid within the tubular portion 1 6 to the position shown in Figure 1 and the liquid will overflow the cup-like member 1 7 and enter the chamber 11 and flow into the drainage system via the outlet 1 3. The inlet 12 can receive waste liquid discharged from an adjacent waste drainage unit. It will be appreciated that the inlet 12 can be dispensed with.

When the flow of the liquid through the grating or the cover 20 ceases the liquid level in the tubular portion 16 will drop and the valve member 1 8 will again move to the position shown in Figure 2. In the closed position the valve member 1 8 isolates the water trap from the chamber 12 and acts as a non-return valve preventing backflow of water or foul air from the chamber 12 through the trap. The valve member 18 will also prevent insects, such as cockroaches entering the floor area from the drain.

The drainage gully can be formed of any suitable material.

It will be seen from the drawings that the upper end of the tubular portion 1 6 extends above the upper wall 14 to form a weir. As the floor gully is liable to receive particles of grit or dirt etc which flow through the grating 20 they will be trapped on the upper wall and be prevented from flowing down the tubular portion 16, and they can be removed after removing the grating 20.

Figure 3 shows an embodiment which is similar to that shown in Figures 1 and 2 and similar parts are identified by the same reference numerals. In this embodiment the wier is formed by an upstanding perforated wall 22 and the upper transverse wall 14 is detachably secured to the casing 10 by bolts 23. The lower end of the tubular portion 16 is located on an upstanding central boss 24 provided on the bottom wall of the cup-like member 1 7 and is provided with holes 25.

In the embodiment shown in Figure 4, the outer casing comprising two cylindrical members 26, 27 respectively provided with flanges 28 and 29 secured together by bolts 30. Extending through the bottom wall 31 is a tube 32 which forms an outlet. Mounted on the upper end of the tube 32 is an inverted cup-shaped member 33 whose end wall 34 can sealingly engage the upper end of the tube 32. The side wall of the cup-shaped member 33 is hollow and serves as a float. The end wall 34 can also be hollow to increase the bouyancy of the cup-shaped member 33.

The upper end of the cylindrical member 27 is closed by a removable grating 35 having holes 36 therein and which form the upper transverse wall of the casing 10. In use liquid is drained from a floor surface through the holes 36 in the grating 35 and collects in the chamber 11. As the level of the liquid in the chamber 11 rises the cup-shaped member 33 will rise causing the end wall 34 to lift off the upper end of the tube 32 to allow liquid to flow into the tube 32 and thus to a drainage system to which the bottom of the tube 32 is connected. When the liquid level falls the end wall 34 will seat on the upper end of the tube 32 and prevent foul air and insects escaping from the drainage system into the chamber 11 and thus through the grating 35.

Figure 5 discloses an embodiment which is not provided with a valve. In this embodiment the casing 10 is similar to that shown in Figure 4 and like parts identified by the same reference numerals. In this embodiment the inverted cupshaped member is formed by a tube 37 which is secured to and extends vertically downwardly from the grating 35 and in which the tube 32 is received.

The embodiment shown in Figure 6 comprises a cylindrical casing 38 which is open at its bottom end and which end is in use connected to a drainage system. The casing 38 has a flange 39 secured by bolts 40 to a flange member 41 which supports a transverse wall 42 detachably secured to the flange member 41 by bolts 43. Secured to the transverse wall 42 is a downwardly extending tube 44 which is closed at its bottom end by an end wall 45. The tube 44 is provided near its bottom end with holes 46. Secured to the end wall 45 is the end wall of a cup-like member 47. Extending above the transverse wall 42 is a perforated weir 48 received within a cylindrical wall 49 secured to the flange member 41 and the upper end of the wall 49 supports a grating 50.

By releasing the nuts on the bolts 43 the transverse wall 42 can be lifted and the cup-like member 47 passed through the flange member 41 for servicing.

All of the desired embodiments have an overall depth which is relatively short and this enables the gully to be installed in the space between a floor and a lower ceiling.

Claims

1. A drainage gully for use in draining liquid from a floor surface, comprising an outer casing portion defining a chamber having an outlet for connection to a drainage system, said casing portion having at its upper end a transverse wall portion provided with an inlet opening, said inlet opening or said outlet being extended by a tubular portion which extends into a cup-like member located within the chamber and which forms a water trap.

2. A drainage gully as claimed in claim 1, in which the transverse wall portion is detachably mounted on the outer casing.

3. A drainage gully as claimed in claim 1 or claim 2, in which the outlet is extended by a tube which extends through a bottom wall of the casing.

4. A drainage gully as claimed in claim 1 or claim 2, in which the inlet is extended by a tube.

5. A drainage gully as claimed in any preceding claim, in which backflow of water or foul air from the drainage system is prevented by a valve member or float.

6. A drainage gully as claimed in claim 5, in which the inlet is extended downwardly by a tubular portion which extends into said cup-like member and a valve member surrounds the tubular portion and is located between the upper end of the cup-like member and said transverse wall portion and is movable between a position in which it closes the upper end of said cup-like member and a position in which it lies clear of the upper end of said cup-like member to allow any liquid which flows into the cup-like member through said tubular portion to overflow into said chamber and be discharged therefrom into a said drainage system when connected to said outlet.

7. A drainage gully as claimed in claim 5, in which the outlet is extended upwardly by a tubular member which extends into an inverted cup-like member, the end wall of the cup-like member forming a valve member which can close the upper end of the tubular member and said cup-like member being formed as a float.

8. A drainage gully as claimed in any one of claims 1 to 6, in which the upstream side of the inlet is surrounded by a weir contained within a chamber formed above said transverse wall portion, said chamber being closed at its upper end by a removable grating.

9. A drainage gully as claimed in claim 8 when dependent upon claim 4 in which the lower end of the tube is secured to the bottom wall of the cuplike member.

10. A drainage gully for use in draining liquid from a floor surface, substantially as hereinbefore described with reference to and as illustrated in Figures 1 and 2 or Figure 3 or Figure 4 or Figure 5 or Figure 6 of the accompanying drawings.