AU2011100510A4

AU2011100510A4 - A water trap and a floor drain assembly including a water trap

Info

Publication number: AU2011100510A4
Application number: AU2011100510A
Authority: AU
Inventors: Brian Eyley
Original assignee: Plastec Australia Pty Ltd
Current assignee: Plastec Australia Pty Ltd
Priority date: 2011-05-04
Filing date: 2011-05-04
Publication date: 2011-06-02
Anticipated expiration: 2019-05-04
Also published as: AU2011100510B4

Description

1 A WATER TRAP AND A FLOOR DRAIN ASSEMBLY INCLUDING A WATER TRAP FIELD OF THE INVENTION 5 This invention relates to a water trap for mounting to a drain assembly and a floor drain assembly including the water trap. This invention relates particularly to a water trap for mounting in a floor drain spaced beneath a floor waste. It will therefore be convenient to hereinafter describe the invention 0 with reference to this example application. However at the same time it must be recognized that the invention is capable of broader application. For example it could be mounted on drain pipes other than those leading from floor wastes. DEFINITIONS 5 In the specification the term "comprising " shall be understood to have a broad meaning similar to the term "including" and will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. This definition also applies to variations on the term "comprising" 0 such as "comprise" and "comprises". BACKGROUND TO THE INVENTION Floor drains are often found in the floors of building structures for draining water on the floor 25 thereof into the drain system. The entrance to the floor drain is called a floor waste and comprises a support that is permanently mounted to the floor surrounding the drain and a removable grate that covers the opening defined by the waste support. Water that is standing on the floor can pass through the grate and into the drain. The grate can be manually removed from the support to provide a person standing on the floor with access to 30 an interior of the drain pipe. This can be useful to remove debris and clean out the drain.

2 It is necessary to install a water trap into a drain downstream of a floor waste. The water trap acts to provides a water seal between the floor waste and its opening into the bathroom space and a sewerage main into which the drain discharges downstream of the floor waste. 5 The water trap provides a barrier to odour passing in a reverse direction from the sewerage main up through the floor waste. It also resists the floor of germs and bacteria and other pathogens from the sewerage main up into the living space. Often a water trap is formed integrally in the drain conduit downstream of the floor waste. o The water trap may be in the form of a P trap or S trap in which the shape of the pipeline forms a water seal. These water traps are usually formed in the drain conduit when it is built. They can be inserted into the drain pipe after it has been installed but quite a bit of work is required. 5 Clearly it would be advantageous if a contrivance could be devised for quickly and easily fitting a water trap to a drain pipe beneath a floor waste. Further it would also be useful if a water trap could be devised that could be accessed through a floor waste by a user so that it could be maintained and/or replaced without having 0 to resort to major plumbing operations. SUMMARY OF THE INVENTION According to one aspect of this invention there is provided a water trap for mounting to a 25 floor drain assembly including a drain support received within the drain pipe, and a grate mounted on the drain support and extending across the drain opening, the water trap including: a trap housing having a mounting formation for removably mounting the trap on the drain support of the floor drain assembly, the trap housing being received within the drain 30 pipe in use, the trap housing also defining a trap outlet though which water can exit the trap, and 3 a trap downcomer mounted on the trap housing for directing water through a trap inlet into the trap housing, and the trap downcomer combining with the trap housing to define a water seal when the water trap is in use. 5 The mounting formation and the drain support may be configured so that the trap housing rests on the drain support whereby to support the trap housing, and which thereby also enables the trap to be removed from the drain assembly by lifting it off the drain support. The mounting formation may extend around at least half of the circumferential extent of the 0 trap housing. Optionally the projection may extend substantially fully around the circumferential extent of the trap housing. The mounting formation may be formed by having a neck region of the trap housing of reducing size extending in a downward direction for mounting on the drain support, and 5 wherein the drain support may have a complementary shape to the region of reducing size on the trap housing and may comprise a complementary region on the drain support of increasing size extending in an upward direction, whereby to support the trap housing thereon. o The trap housing may be substantially circular and the mounting formation may comprise an operatively lower portion of the housing that has a diameter that is smaller than another portion of the housing that is operatively above it, and wherein the drain support is configured to support said other portion of the trap housing on the drain support. 25 In one form the mounting formation may comprise a neck of reducing diameter and the complementary drain support may comprise a shoulder on which the neck is supported in use. The trap housing may have a mounting portion that is substantially cylindrical and a bowl 30 portion that is supported by the mounting portion and is received within the circumferential extent of the mounting portion.

4 The trap housing and the trap downcomer may be combined in a way that provides a water seal having a depth of at least 65mm when the trap is charged with water in use. In a preferred form the water trap forms a water seal of at least 70 mm to meet the Australian standard for complying water traps in domestic plumbing installations. 5 The cylindrical mounting portion of the trap housing may have a downcomer mounting portion formed by a support shoulder projecting radially inward from an inward facing surface thereof. The downcomer mounting portion may be located towards an operatively upper edge of the trap housing. 0 The downcomer mounting portion may also include a downcomer attachment arrangement for releasably mounting the downcomer to the trap housing. According to another aspect of this invention there is provided a floor drain assembly for 5 mounting on a drain pipe on a floor region, the drain assembly comprising: a drain support for being received within the drain pipe; a grate mounted on the drain support and extending across a drain opening; and a water trap including: a trap housing having a mounting formation for removably mounting the trap 0 on the drain support, the trap housing also defining a trap outlet though which water can exit the trap, and a trap downcomer mounted on the trap housing having a trap inlet for directing water into the trap housing, the trap downcomer combining with the trap housing to define a water seal when the water trap is in use. 25 The mounting formation and the drain support may be configured so that the trap housing rests on the drain support whereby to support it, and thereby also enables the trap to be removed from the drain assembly by lifting it off the drain support. The mounting formation may project out in a radial outward direction and the drain support 30 may also project out in a radial direction, and the mounting formation sits on the drain support to support the trap housing thereon.

5 The mounting formation may be formed by having a region of the trap housing having a reducing size extending in a downward direction for mounting on a drain support whereby to support the trap housing thereon. 5 The drain support may be complementary to the region of reducing size on the trap housing and may comprise a complementary region on the drain support of increasing size extending in an upward direction. The mounting formation may be circular and may comprise an operatively lower portion of 0 the housing having a diameter that is smaller than a portion of the housing that is operatively above it, and wherein the complementary drain support is configured to support the housing above the lower portion thereof when the trap is positioned within the drain support body. In one form the mounting formation may comprise a neck of reducing diameter and the 5 complementary drain support may comprise a shoulder of increasing diameter on which the neck is supported in use. The drain support may include a puddle flange that is mounted on the drain pipe. o The drain support may also include an adaptor mounted on the puddle flange, and the vertical position of the adaptor relative to the puddle flange may be adjustable for aligning the adaptor with a floor height surrounding the drain assembly, and the complementary mounting formation supporting the water trap may be formed on the adaptor body. 25 The grate may be mounted on the adaptor and may be capable of being removed from the adaptor and then being replaced on the adaptor by lifting it off the adaptor and then placing it back on the adaptor. The water trap may include any one or more of the optional features of the water trap as 30 defined above in the preceding aspect of the invention.

6 The invention also extends to a plumbing installation including a drain pipe and a water trap as defined above in the preceding aspect of the invention removably mounted in the drain pipe. 5 The drain pipe may extend away from a floor and the plumbing installation may further include a floor waste. The floor waste may be removable to provide user access to the water trap which is also removable as defined above. Once again the water trap may include any one or more of the optional features of the water 0 trap as defined above in the preceding aspect of the invention. DETAILED DESCRIPTION OF THE INVENTION A water trap and a floor drain assembly in accordance with this invention may manifest itself 5 in a variety of forms. It will be convenient to hereinafter describe several embodiments of the invention in detail with reference to the accompanying drawings. The purpose of providing this detailed description is to instruct persons having an interest in the subject matter of the invention how to carry the invention into practical effect. However it is to be clearly understood that the specific nature of this detailed description does not supersede 0 the generality of the preceding broad description. In the drawings: Fig. 1 is an upper three dimensional view of a water trap in accordance with one embodiment of the invention; Fig. 2 is a lower three dimensional view of the water trap of Fig. 1; 25 Fig. 3 is a front view of the water trap of Fig. 1; Fig. 4 is a side view of the water trap of Fig. 1; Fig. 5 is a sectional front view of the water trap of Fig. 1, section through V-V; Fig. 6 is a sectional side view of the water trap of Fig. 1, section through VI-VI; Fig. 7 is an upper three dimensional view of a drain assembly in accordance with one 30 embodiment of the invention incorporating the water trap of Fig. 1; Fig. 8 is an exploded three dimensional view of the drain assembly of Fig. 7; 7 Fig. 9 is a sectional side view of the drain assembly of Fig. 7, section through IX-IX; Fig. 10 is a sectional view of the drain assembly in Fig. 7 in use installed in a drain pipe beneath a floor waste; and Fig. 11 is a sectional side view of a drain assembly in accordance with another embodiment 5 of the invention incorporating the water trap of Fig. 1 or a variation thereof. In Fig. 1 reference numeral 10 refers generally to a water trap in accordance with one embodiment of the invention. 0 The water trap 10 comprises broadly a trap housing 12 that is mountable in a removable fashion to the drain support assembly 56 and that defines a water outlet 14 through which water can pass out of the trap housing 12. The trap 10 also includes a trap downcomer 16 mounted on the trap housing 12 that defines a trap inlet 20 through which water can enter the water trap 10 and a downcomer outlet 22 though which water issues from the 5 downcomer 16 into the trap housing 12. The trap downcomer 16 and the trap housing 12 are configured to interact to form a water seal as shown in Figure 10 when the trap 10 is in use. The trap 10 also includes a flexible seal 26 mounted on the downcomer 16 and projecting away therefrom in a radial direction for engaging an inner surface of the drain support assembly 56. 0 Each of these components will now be described in more detail. The trap housing 12 comprises a substantially cylindrical portion 30 that has an outer or outward facing cylindrical surface 32. The trap housing 12 also includes a bowl portion 34 25 that is circumferentially surrounded by the cylindrical portion 30 and which is mounted to the cylindrical portion 30. The interrelationship between the cylindrical portion 30 and the bowl portion 34 is best illustrated in Figures 5 and 6 of the drawings. The cylindrical portion 30 of the trap housing 12 has a downcomer mounting portion 72 that 30 is a support shoulder 36 projecting radially inward from an inward facing surface of the drain support assembly 56 towards an operatively upper edge of the trap housing 12.

8 The downcomer mounting portion 30 also includes a downcomer retaining arrangement 40 formed by complementary engagement formations on the cylindrical portion 30 and the downcomer 16 for releasably attaching the two components to each other. In the illustrated embodiment the complementary engagement formations are formed by a rib 41 on the trap 5 downcomer 16 extending radially inward, and a complementary recess facing radially outward from the trap housing 12 within which the rib can be received. The recess is sized and configured to receive the rib tightly therein so as to effectively attach and mount the downcomer 16 to the housing 12. This arrangement may be described as 'a displace and turn' mechanism, or a 'bayonet type' mechanism. 0 In the illustrated embodiment the support shoulder 36 is formed by an operatively upper surface of said drain support assembly 56 and thus in this embodiment the same structure is used to mount the downcomer 16 on the housing 12 that is used to releasably attach the downcomer 16 to the housing 12. However this need not be the case and in other 5 embodiments the retaining arrangement could be quite different to the structural feature forming the support shoulder 36. As shown in the drawings the trap downcomer 16 is received within the bowl portion 34 of the trap housing 12. The trap downcomer 16 has a tubular configuration with a substantially 0 circular cross section and has one open end that defines the water trap inlet 20 and an opposed open end that forms the downcomer outlet 22 that opens into the bowl portion 34 of the housing 12. The trap downcomer 16 has a handle formation 42 towards its operatively upper end in the form of a linear member that extends diametrically across the trap inlet 20. 25 The bowl portion 34 of the housing 12 forms the receptacle or container within which the water forming the water seal is received in use. The bowl portion also defines an overflow weir which forms the trap outlet 14. The bowl portion 34 has an elongate cross section having a length that is longer than the diameter of the trap downcomer 16 whereby to provide space for water issuing from the downcomer 16 into the trap housing 12 and then 30 pass out through the outlet 14. The bowl portion 34 is dimensioned to snugly receive the trap downcomer 16 therein in a direction that is transverse to the direction of the bowl portion 34. The trap housing 12 and the downcomer 16 can conveniently be formed from a type of material that inhibits the growth and build up of pathogens thereon, in particular bacteria.

9 This functionality can be achieved by coating the material from which the housing 12 and downcomer 16 with a substance that inhibits the growth of bacteria or kills bacteria. This material can also be impregnated with the anti-bacterial substance, e.g. an anti-bacterial polymer to achieve a similar result. The antibacterial substance can be introduced at the 5 time that the downcomer 16 and the trap housing 12 are formed by moulding or it may be introduced after they have been formed. The flexible seal 26 comprises a substantially cylindrical seal that circumferentially surrounds the mounting portion 30. In use the seal is stretched and located within a recess of the 0 downcomer mounting portion 30 such that it forms a seal between the the downcomer mounting portion 30 and the drain support assembly 56. The seal 26 is integrally formed of a resiliently flexible material, such as a rubber or plastic material by a moulding operation. This material enables the seal 26 to be deformed to enable the water trap 10 to be inserted into the drain support assembly 56 when the trap 10 is being installed. 5 Figures 7 to 9 illustrate a floor drain assembly in accordance with one embodiment of the invention incorporating a water trap in accordance with figure 1 therein. In Figures 7 to 9 the floor drain assembly or floor waste is indicated generally by the 0 reference numeral 50. The floor drain assembly 50 comprises a drain support assembly 56 which in use is received within an upper end of a drain pipe 66. The drain support assembly 56 comprises a puddle flange 60 and an adaptor 64 which is mounted on the puddle flange 60. The drain assembly 25 50 also includes a grate 52 and a grate support 53 which are mounted on the adaptor 64 and extending across the flow path defined by the adaptor 64 specifically and the drain assembly 50 more generally. Further the drain assembly 50 also includes a water trap 10 as described above and illustrated in Figures 1 to 6 which is also mounted on the adaptor 64. The water trap 10 includes a trap downcomer 16 mounted on the trap housing 12 having a 30 trap inlet 20 for directing water into the trap housing 12, the trap downcomer 16 combines with the trap housing 12 to define a water seal when the water trap 10 is in use.

10 Each of the above components will now be described in more detail with reference to the drawings. The floor drain assembly 50 comprises broadly a drain support assembly 56 that in turn 5 comprises a cylindrical body portion 65 and a laterally outwardly extending flange portion or puddle flange 60. The floor drain assembly 50 also includes an adaptor 64 comprising a cylindrical adaptor body member 67 defining a flow passage there through and having open ends, and a grate 52. The adaptor 64 is mounted over the body portion 65. 0 The adaptor body member 67 has a broadly cylindrical configuration which is mounted on the drain support assembly 56 and the cylindrical body portion 65. The vertical position of the adaptor 64 relative to the puddle flange 60 is adjustable for aligning the adaptor 64 and the grate 52 with a floor height surrounding the floor drain assembly 50. When installing the floor drain assembly 50 into a floor, the height of the grate 52 is aligned with the top of the 5 floor by adjusting the position of the adaptor body member 67 in relation to the cylindrical body portion 65. The adaptor body member 67 is fixed into position by either gluing or some other fixing agent which allows the adaptor body 67 and grate 52 to be fixed in the correct position in alignment with the top of the floor (ie flush with the top level of the floor). 0 The grate 52 is removably mounted over the adaptor 64, the grate 52 is broadly in the form of a circular disc that extends across one end of the body member 67. It defines a plurality of openings through which water can pass into a drain pipe 66 while still providing a support function. 25 The adaptor 64 also includes a grate support 53 that circumferentially surrounds and receives the grate 52 which is removably attached thereto. The grate support 53 in turn is formed on the upper end of the adaptor 64 and serves as an interface between the grate 52 and the body member 67. 30 The cylindrical body portion 65 of the adaptor 64 has at its lower end a seal recess and a seal 62 for forming a water seal between the adaptor 64 and the pipe 66. The seal 62 is integrally formed of a resiliently flexible material, such as a rubber or plastic material by a moulding operation. 35 The drain support assembly 56 may be made as an integral article of plastics material and the integral article may conveniently be formed by an injection moulding process. Further 11 the body member 67 of the adaptor 64 may also be made of plastics material by an injection moulding process. The grate 52 may be made, e.g. separately, by a moulding or stamping process. The grate 52 may be made of plastics material. Alternatively the grate 52 may be made of a metallic material. The grate support 53 may also be made by a moulding 5 process. Typically the support 53 will be made of a softer material than the grate 52 and the body member 67. The first step in the actual installation process is for the floor drain assembly 50 to be placed over a drain pipe 66 opening onto a floor with the cylindrical body portion 65 of the drain 0 support assembly 56 received within the upper end of the drain pipe 66. The floor is a basic floor surface that typically comprises concrete, e.g. of a concrete slab, and has not yet been finished. The puddle flange 60 rests on the concrete floor. After this a finish is applied to the floor to yield a finished floor surface. Typically this would 5 be floor tiles. In a bathroom the floor tiles sit on a screed or grout that is placed on the basic floor surface described above. To align the grate 52 with the finished floor surface the adaptor 64 is displaced out of the drain support assembly 56 by moving the adaptor 64 in the appropriate direction. In this way the height of the grate 52 can be infinitely adjusted until it is aligned with the surface of the finished floor. 0 This provides a finished floor with a flush grate 52. Further the grate 52 and adaptor 64 are supported in that position and are resistant to be being displaced axially relative to each other because they are fixed in these positions by a fixing agent such as glue or the like to maintain this desired position notwithstanding a substantial load being applied to the grate 25 52. As described above and illustrated in Figures 1 to 6 a water trap 10 is mounted on the cylindrical adaptor body member 67 of the adaptor 64. The water trap 10 having a mounting formation 72 located on an upper portion of the trap downcomer 16, which forms a 30 complementary mounting arrangement with the support formation 74 located on the cylindrical adaptor body member 67. This therefore allows the water trap 10 to be removably mounted on the drain support assembly 56 of the floor drain assembly 50. In their most general form the mounting formation 72 and the support formation 74 are 35 configured so that the mounting formation 72 of the trap housing 12 and the trap downcomer 16 rests on the support formation 74 of the adaptor 64.

12 Figures 9 and 10 show the mounting formation 72 projecting out in a radial outward direction and the support formation 74 projecting out in a radial direction which is opposite to the of the direction of the mounting formation 72. The mounting formation 72 is formed by having a region of the trap body having a reducing size extending in a downward direction for 5 mounting on the support formation 74. Likewise, the support formation 74 forms a complementary shape to that of the region of reducing size on the trap body and comprises a complementary region on the drain support assembly 56 of increasing size extending in an upward direction. 0 In a further embodiment the mounting formation 72 may be circular and comprises an operatively lower portion of the trap housing 12 having a diameter that is smaller than a portion of the trap housing 12 that is operatively above it, In a further embodiment the mounting formation 72 comprises a neck of reducing diameter 5 and the complementary support formation 74 comprises a shoulder of increasing diameter on which the neck is supported in use. Figure 10 illustrates the drain assembly of Figures 7 to 9 in use installed in a plumbing installation. 0 Once the water trap 10 is in place water is poured down the floor drain assembly 50 or waste to form a water seal having a depth of 70 mm in the water trap 10. The water seal forms a barrier between the floor drain assembly 50 and the pipe 66 downstream of, or beneath, the water trap 10 as shown in Figure 10. This resists harmful agents and odour from the pipe 66 25 or the sewerage pipe that is downstream thereof, from passing up through the floor drain assembly 50 and into the air space above the floor drain assembly 50. From time to time the water trap 10 can be accessed and also be removed from the drain pipe 66 in a similar way by lifting off the grate 52 and reaching down into the drain pipe 66 and then manually pulling the water trap 10 out of the pipe 66. 30 In use as shown in Figure 10, water passing through the floor drain assembly 50 into the drain pipe 66 enters the water trap 10 through the trap inlet 20. The water passes down the trap downcomer 16 and enters the pool of water in the bowl portion 34 of the trap housing 12 13 forming the water seal. As new water enters the trap downcomer 16 it displaces other water in the bowl portion 34 causing it to overflow and pass out of the trap outlet 14 and into the downstream portion of the drain pipe 66. 5 In Figure 11 the floor drain assembly or floor waste is indicated generally by the reference numeral 70. Unless otherwise indicated the same reference numerals will be used to refer to the same components as in the earlier embodiment. The following description will focus on the 0 differences between this embodiment and the earlier embodiment. The floor drain assembly 70 comprises broadly a drain support assembly 56 that in turn comprises a cylindrical body portion 65 and a laterally outwardly extending flange portion or puddle flange 60. The floor drain assembly 70 also includes an adaptor 64 comprising a 5 cylindrical adaptor body member 67 defining a flow passage there through and having open ends, and a grate 52. The adaptor 64 is mounted over the body portion 65. The puddle flange 60 has a screw thread 80 formed on the internal bore of the cylindrical body portion 65. The screw thread 80 on the cylindrical body portion 65 shown in Figure 11 0 has a very limited axial extent comprising one or at most two turns. Further the screw thread 80 has interruptions or spaces at intervals around the circumference of the cylindrical body portion 65. This is to permit water to drain there through and into a drain pipe 66 in use. The adaptor body member 67 has a broadly cylindrical configuration with a screw thread 82 25 on an external surface thereof that is complementary to the screw thread 80 formed on the puddle flange 60. This screw thread 82 has a greater axial extent than the thread 80 on the puddle flange 60. In the illustrated embodiment the screw thread formation 82 extends substantially the full 30 axial distance of the cylindrical adaptor body member 68 and comprises a plurality of complete turns, e.g. 6 to 8 complete turns. Further the screw thread 82 is continuous and does not have the spaces or interruptions in each turn like that on the puddle flange 60. The first step in the actual installation process is the same as in the process described 35 above for the previous embodiment using floor drain assembly 50.

14 The installation process differs when the grate 52 is aligned with the finished floor surface as described below. After this a finish is applied to the floor to yield a finished floor surface. In the illustrated 5 embodiment of Figure 11 the flooring is typically a floor tile. In a bathroom the floor tiles sit on a screed or grout that is placed on the basic floor surface described above. To align the grate 52 with the finished floor surface the adaptor 65 is displaced out of the puddle flange 60 by rotation of the adaptor 65 in the appropriate direction. In this way the height of the grate 52 can be infinitely adjusted until it is aligned with the surface of the finished floor. 0 One advantage of the water trap described above with reference to the drawings is that it provides a fully compliant water trap having a water seal having a depth of 70 mm that meets all the relevant Australian standards. 5 A further advantage of this water trap is that it is accessible from the floor waste and can be accessed by a plumber through the floor waste by simply lifting off the grating. This can be useful if maintenance is required to be carried out on the water trap such as if the trap is blocked. A further advantage of this feature is that it can be inspected if a valuable item gets lost down the floor waste such as an item of jewellery. A yet further advantage is that the 0 water trap resists flow of soap suds and the like in a reverse direction up through the floor waste. This can be very useful if the floor waste is in parallel with a shower floor waste outlet and /or a bath outlet. A yet further advantage of the trap is that the material from which the components of the trap 25 are made can include an antibacterial substance that resists the growth of pathogens in the water trap. This in turn helps to avoid odours rising out of a floor waste and into the space within a dwelling above the floor waste. It will of course be realized that the above has been given only by way of illustrative example 30 of the invention and that all such modifications and variations thereto, as would be apparent to persons skilled in the art, are deemed to fall within the broad scope and ambit of the invention as is herein set forth.

Claims

1. A water trap for mounting to a floor drain assembly including a drain support received 5 within the drain pipe, and a grate mounted on the drain support and extending across a drain opening, the water trap including: a trap housing having a mounting formation for removably mounting the water trap on the drain support of the floor drain assembly, the trap housing being received within the drain pipe in use, the trap housing also defining a trap outlet though which water can exit the trap, o and a trap downcomer mounted on the trap housing for directing water through a trap inlet into the trap housing, and the trap downcomer combining with the trap housing to define a water seal when the water trap is in use.

2. A floor drain assembly for mounting on a drain pipe on a floor region, the drain 5 assembly comprising: a drain support for being received within the drain pipe; a grate mounted on the drain support and extending across a drain opening; and a water trap including: a trap housing having a mounting formation for removably mounting the trap 0 on the drain support, the trap housing also defining a trap outlet though which water can exit the trap, and a trap downcomer mounted on the trap housing having a trap inlet for directing water into the trap housing, the trap downcomer combining with the trap housing to define a water seal when the trap is in use. 25

3. A floor drain assembly according to claim 2, wherein the mounting formation and the drain support are configured so that the trap housing rests on the drain support whereby to support the trap housing, and which thereby also enables the trap to be removed from the drain assembly by lifting it off the drain support. 30

4. A floor drain assembly according to claim 3, wherein the mounting formation is formed by having a neck region of the trap housing of reducing size extending in a downward direction for mounting on the drain support, and wherein the drain support has a 16 complementary shape to the region of reducing size on the trap housing and comprises a complementary region on the drain support of increasing size extending in an upward direction, whereby to support the trap housing thereon.

5 5. A floor drain assembly according to any one of claims 2 to 4, wherein the drain support includes a puddle flange that is mounted on the drain pipe and an adaptor that is mounted on the puddle flange, and wherein the vertical position of the adaptor relative to the puddle flange is adjustable for aligning the adaptor with a floor height surrounding the drain assembly, and wherein the complementary mounting formation is formed on the adaptor 0 body, and wherein a grate is mounted on the adaptor and can be removed from the adaptor and then replaced on the adaptor.