GB2402946A

GB2402946A - Waste trap

Info

Publication number: GB2402946A
Application number: GB0412776A
Authority: GB
Inventors: James Edward Self; Robert William Stimpson
Original assignee: DLP Ltd
Current assignee: DLP Ltd
Priority date: 2003-06-17
Filing date: 2004-06-09
Publication date: 2004-12-22
Anticipated expiration: 2024-06-09
Also published as: GB0313987D0; GB2402946B; GB0412776D0

Abstract

A waste trap comprises a trap body 1 having an inlet opening at its upper end and a side outlet opening, a bowl 5 removably mounted within the body and defining a weir 7 and a dip tube 4 connected to and extending into the bowl. The bowl and dip tube define a water flow path from the inlet opening down through the dip tube, up through the bowl and over the weir to the outlet opening. The bowl and dip tube are removable as a single unit. The waste also comprises a discharge tube 2 extending downwards away from the outlet opening of the body at an angle to the vertical.

Description

A WASTE TRAP

The present invention relates to a waste trap.

Over many years the water-seal drainage trap has developed from simple S shaped and P-shaped bends as exemplified by Pritchard in US1833303 (1931) and McAlpine GB891605 (1960) into the more recent art of Spanberg GB1583228 (1977), McAlpine GB2041422A (1980), and McAlpine GB2301847B (1995).

The present invention seeks to simplify the construction of the trap, to allow fully unrestricted access to the waste outlet for clearage of blockages and rodding of the trap from the waste inlet direction, and to provide a more beneficial and versatile option choice to the installer.

According to a first aspect of the invention there is provided a waste trap comprising a trap body having an inlet opening at its upper end and a side outlet opening, a bowl removably mounted within the body and defining a weir and a dip tube connected to and extending into the bowl, the bowl and dip tube defining a water flow path from the inlet opening down through the dip tube, up through the bowl and over the weir to the outlet opening and the bowl and dip tube being removable as a single unit.

Preferred and/or optional features of the first aspect of the invention are set forth in claims 2 to 6.

According to a second aspect of the invention there is provided a waste trap comprising a trap body having an inlet opening at its upper end and a side outlet opening and a discharge tube extending downwards away from the outlet opening of the body at an angle to the vertical.

A preferred feature of the second aspect of the invention is set forth in claim 8.

The invention will now be more particularly described by way of example with reference to the accompanying drawings, in which: Figure 1 is a sectional view of one embodiment of a waste trap in accordance with the invention; Figure 2 is a section cut on line 1-1 of Figure 1; Figure 3 is a view of the waste trap with the discharge elbow located to discharge in a horizontal manner; Figure 4 is a view of the waste trap with the discharge elbow located to discharge vertically down; Figure 5 is a view of the component parts of the waste trap viewed in an exploded' or separated form to indicate their relative positions during assembly; Figure 6 is a view along arrow "X" indicated on Figure 1, viewing the inlet with all other components removed, showing the outlet bore.

The waste trap illustrated in the drawings is manufactured from plastics material in the preferred embodiment, and comprises a body or inlet part 1 and a discharge pipe 2 protruding downwards and away from the inlet part at 45 to the vertical axis indicated by 1-1 on Figure 1. The inlet part 1 has mounted therein an insert 3 comprising a dip tube 4 and a bowl S which are rigidly connected to allow them to be withdrawn from the inlet 1 as a single entity. The dip tube 4 has an opening throat edge 6 adjacent to the centre of the trap, which in combination with the upper edge or weir 7 of the bowl S forms the depth of the water seal provided by the trap.

A rigid connection 38c (Figure 2) comprising snap-fit permanent connections of a pair of recesses 38b (Figure S) symmetrically disposed on the bowl S and a pair of projecting ramped pegs 38a (Figure 5) symmetrically disposed on the dip tube 4 allows the trap principle of the invention (6,7) and the liquid content of the trap within the bowl S to be removed in one single action for cleaning at a remote location. The bore 8 of the discharge pipe 2 is then revealed in full section when viewed from the position indicated by arrow "xn. This allows unrestricted access for rodding and clearing of any blockages which may occur within the waste pipe (not shown) connected to the discharge pipe 2 by way of the discharge elbow 13.

Additionally this permits the installation of grids, filters or other detritus catching devices (not shown) to be installed or removed from within the elbow and discharge pipe bore.

When the invention contains waste water to the level of the weir 7, an airtight seal is formed separating the foul air contained in the waste pipe (not shown) attached to the discharge pipe 2, and the air above the dip tube 3. This seal is achieved with the dip tube 4 top flange member 9 which forms an airtight perimeter seal in conjunction with seal member 10 located in the annular groove 11 formed around the periphery of member 9 and engagingly contacting the upper portion 12 of the bore of the inlet 1.

Connected to the discharge tube 2 adhesively in the preferred embodiment is the discharge elbow 13 which creates an angle of 135 between the discharge tube 2 and any discharge pipe which the installer may connect to the open end 15 of the discharge elbow 13. By selecting the orientation of the discharge elbow 13 it is possible for the installer to select either a horizontal discharge elbow and pipe arrangement as indicated in Figure 3 or a vertical discharge elbow and pipe arrangement as indicated in Figure 4.

As described extensively in the prior art, the installation of this type of waste trap inlet is common to ensure ease of use by installers and conformity to what has become industry norms of application. Accordingly, the preferred embodiment of this invention uses the inlet l to include a locating ring 16 which is located within the floor of the waste water installation, and upon this is laid a waterproof floor covering 17 which extends into recess 18 provided within the inlet as a frusto-conical sloping section 19, the upper edge of which is provided with a smoothing radius 20 to minimize damage to the floor covering 17 during installation. The floor covering 17 is retained in the recess 18 by a clamping member in the form of a mutually frusto conical walled retaining ring 21 which is held in place by a plurality of threaded fixing screws 37 engaging in mutually threaded holes or inserts 22 rigidly retained within the inlet 1.

This action is carried out upon initial installation and forms a water proof seal between floor covering and waste inlet 1. This does not need to be disturbed whilst the waste trap is to remain installed.

Located above the dip-tube 4 and located within the location ring 21 is a perforated top cover 23 which allows liquid to pass through slotted and radiused perforations into the dip tube 4. The top cover 23 is retained in the inlet 1 by a plurality of threaded fixing screws 24 which engage in mutually threaded holes or inserts 25 rigidly retained within the inlet 1. The top cover may also beneficially be recessed as shown in Figure 2 at 29 to accept an adhesively retained insert depicting a corporate logo or badge (not shown). When the fixing screws 24 are fully tightened down the top cover 23 engages with the upper surface of the retaining ring 21 on the inner upper surface 27 to the ring 21. Simultaneously the central lower face 28 of the top cover 23 contacts the upper edges of a finger-grip web 26a and 26b of the dip tube 4, which creates a clamping action to retain the dip tube and bowl in position.

This prevents buoyancy forces or forces created during the flow of liquid through the waste trap from displacing the dip tube 3 and bowl 5 from within the inlet 1 and breaking the air-tight seal created by the seal member 10.

The waste trap described above is very compact and the discharge elbow 13 can be installed in a horizontal alignment 30 or a vertical alignment 32 whilst in both alignments providing the installation within the depth of the waste trap as may be measured from the upper flange 16 to the base 31 of the inlet 1 as depicted in Figures 3 and 4.

The discharge elbow 13 comprises a circular hollow socket section 33 connected to a sector of a hollow toroid 34 in turn connected to a cylindrical connection boss 35. The axes of the hollow toroid section 34 and connection boss 35 are coincident.

The preferred embodiment of the present invention incorporates a singular circular flange 39 which is set below the mounting flange 16 and may be used when the waste is embedded into screed to create a large recess 40 for the retention of screed. This recess forms a toroid of approximately square cross section-the width of the flange projecting from the body of the waste is approximately the same as the distance of the flange below the closest part 41 of the waste body above it.

This embodiment thus provides: A waste trap in which the functions of dip tube, weir and bowl to contain the water forming the air seal trap are combined into one removable part.

A waste water trap which provides unrestricted full perpendicular crosssection access to the waste discharge pipe to permit cleaning and rodding activities with the removal of one single dip tube, weir and bowl component.

A waste trap in which the outlet connection is located at 45 to the vertical and is connected to a 135 elbow, permitting the connection of the single elbow to discharge selectively on installation in either a vertical or horizontal manner.

A waste trap in which the provision of a combined vertical and horizontal outlet connection is provided within the vertical distance from the upper mounting flange to the bottom of the water trap bowl.

A waste trap in which a strainer or filter may be removably inserted into the discharge pipe.

Claims

1. A waste trap comprising a trap body having an inlet opening at its upper end and a side outlet opening, a bowl removably mounted within the body and defining a weir and a dip tube connected to and extending into the bowl, the bowl and dip tube defining a water flow path from the inlet opening down through the dip tube, up through the bowl and over the weir to the outlet opening and the bowl and dip tube being removable as a single unit.

2. A waste trap as claimed in claim 1, further comprising a clamping member for clamping a floor covering material to the body.

3. A waste trap as claimed in claim 1 or claim 2, further comprising a discharge tube extending downwards away from the outlet opening of the body at an angle to the vertical.

4. A waste trap as claimed in any one of claims 1 to 3, wherein the discharge tube extends away from the trap body at an angle of 45 , or substantially 45 , to the vertical.

5. A waste trap as claimed in claim 3 or claim 4, further comprising an elbow connected to the discharge tube.

6. A waste trap as claimed in claim 5, wherein the elbow extends through, or substantially through, 1350

7. A waste trap comprising a trap body having an inlet opening at its upper end and a side outlet opening and a discharge tube extending downwards away from the outlet opening of the body at an angle to the vertical.

8. A waste trap as claimed in claim 7 and arranged to provide unrestricted full perpendicular cross-section access to the discharge tube for cleaning and rodding purposes.

9. A waste trap substantially as hereinbefore described with reference to the accompanying drawings.