MXPA99000400A - Ventilated insert for tec drainage - Google Patents

Abstract

An improved ventilated drainage insert is presented to be inserted in a large diameter drainage pipe, preferably in a pipe for roof drainage. The insert has a tubular portion that extends into the drain tube forming an annular restriction through the drain tube in the primary passage. A vent tube is provided to provide a secondary passage from above the drain inlet beyond the annular restriction to the drain tube below the drain insert. It is believed that the ventilation tube will advantageously ventilate the air and / or equalize the pressures below the drainage insert under deflux conditions in which air inside the drainage tube is present.

Description

VENTILATED INSERT FOR ROOF DRAINAGE FIELD OF THE INVENTION This invention relates to roof drains and, more particularly, to ventilated inserts for roof drainage and to an improved configuration of a roof drain that provides improved water flow.

BACKGROUND OF THE INVENTION Inserts for roof drainage are known such as those taught in U.S. Patent No. 4,505,499 to Uglo et al, issued March 19, 1985 and in Uglow United States Patent No. 4,799,713. , granted on January 24, 1989. These inserts for roof drainage are particularly useful in situations where the surface layer of the roof will be renewed and a new roof drainage will be installed at a height above the roof drain. existing. The roof drainage inserts have an upper flange to be secured to the new roof surface and a tubular member extending coaxially down into the existing drainage pipe. Because the insert for the roof drain is received inside the drain pipe, the horizontal cross section area P1062 / 99MX through which water can flow, is reduced in the insert in contrast to that of the drain tube.

SUMMARY OF THE INVENTION The present invention has appreciated that the restricted area for the flow of water through a roof drain insert can reduce the flow rate at which water can pass through the roof drain. In addition, the inventor has appreciated the fact that the drain insert provides a flow path with a restricted flow area through the insert, which then opens to the entire cross-sectional area of the drain pipe which, under certain Flow conditions and, particularly, when there is air in the drain pipe or is interspersed in the water flow, can result in a reduced flow of water, due to the interaction of air and water. Accordingly, to overcome these disadvantages at least partially, the present invention provides a drain with a vent pipe that provides a secondary passage for communication from above an inlet to the drain to below a segment of the cross-sectional area restricted. An object of the present invention is to provide a novel ventilation tube for P1062 / 99MX used in roof drains, an improved roof drainage insert with a secondary ventilation passage and a roof drainage unit that incorporates a secondary ventilation passage. Another object is to provide, in a unit for roof drainage with an annular restriction for flow therethrough, a secondary ventilation passage that provides communication from above the inlet to the drain to below the annular restriction. Accordingly, in one aspect, the present invention provides in a drainage unit having a primary passage for flow, which has an upper segment with reduced cross-sectional area opening towards a lower segment having a greater cross-sectional area, a secondary passage for the flow that extends from above an entrance to the primary passage to the lower segment. The invention is particularly useful for aiding fluid flow in the context of drainages that are roof drains, however, it may be advantageous in other drainage environments where water may, under varying conditions, return near an inlet of water. drain and then flow down through an area with restricted cross-section before flowing into an increased cross-sectional area.

P1062 / 99MX In another aspect, the present invention provides an insert for roof drainage having a tubular portion with a lower outlet end adapted to be secured within a large diameter cylindrical drainage pipe., the tubular portion has an upper entrance end. an upper sealing flange for coupling with the roof extending radially outward, from near the upper entrance end of the tubular portion, to prevent the flow of water therethrough by another additional way to the upper inlet end. an annular sealing ring located around the tubular portion near the lower outlet end to form a seal between the tubular portion and the drain tube, an air vent tube secured to the insert, which extends coaxially within the insert from the the inlet end of the tube upwardly above the upper inlet end of the tubular portion, to the outlet end of the tube below the lower outlet end of the tubular portion. In a further aspect, a drain comprising: P1062 / 99MX a vertically extending primary drainage passage for the flow of water vertically downwards through it, a more superior drainage inlet opening that opens into the primary passage for water entry therein roof, an annular restriction member located within the primary passage that blocks the flow of water therethrough as well as through a central vertical restriction segment of the primary passage defined centrally within the annular restriction member, the passage primary has a vertical exit segment immediately below the annular restriction member, wherein the exit segment has a greater horizontal cross-sectional area than the horizontal cross-sectional area of the restriction segment and where the restriction segment is directly opened towards the exit segment in the union between these, a secondary passage that provides communication between a top opening located at a height vertically above the drainage inlet opening and a lower opening located within the primary passage in the exit segment near the junction between the restriction segment and the exit segment, the passage secondary has a section area P1062 / 99MX horizontal cross section for the flow through it, which is smaller than the cross sectional area of the output segment. The present invention provides an improved ventilated insert for drainage for insertion into a larger diameter drain pipe, a roof drain pipe. The insert has a tubular portion that extends into the drain tube, forming an annular restriction in the primary passage through the drain tube. A vent pipe is provided to provide a secondary passage from above the inlet to the drain beyond or passing the annular restriction to the drain tube below the drain insert. It is believed that the vent pipe, advantageously, will vent the air and / or equalize the pressures below the drain insert under flowing conditions in which air is present within the drain pipe.

BRIEF DESCRIPTION OF THE DRAWINGS OR IGUMS Advantages and additional features of the present invention will appear from the following description taken together with the accompanying drawings, in which: Figure 1 is a schematic cross-sectional side view of a drainage unit for ceiling P1062 / 99MX in accordance with the present invention; Figure 2 is a representative view of a ventilation tube comprising part of the unit shown in Figure 1; Figure 3 is a top elevation view of the roof drainage unit shown in Figure 1 where the retaining basket was removed; Figure 4 is a cross-sectional partial view showing a segment of the roof drainage unit of Figure 1; Figure 5 shows an enlarged cross-sectional side view of the lower end of the unit of Figure 1 in an unsealed configuration; Figure 6 is a view similar to Figure 5 but showing a sealed configuration; Figure 7 shows in a schematic and exploded view, the screws, a seal ring and a washer comprising portions of the unit shown in Figure 1; Figure 8 shows an enlarged cross-sectional view of portions of the unit of Figure 1 holding the roofing sheets, and Figure 9 shows a view similar to Figure 8 but with a layer of asphalt and gravel replacing the sheets of roofing.

P1062 / 99MX DETAILED DESCRIPTION OF PREFERRED MODALITIES Reference is first made to Figure 2, which shows a vent pipe member 100 in accordance with the present invention, this vent pipe member 100 is illustrated as used in Figures 1 and 3, in the context of providing an improved drainage insert for roofs and an improved roof drainage unit in accordance with the present invention. The roof drainage unit illustrated in Figures 1 and 3 to 9, different with respect to the vent tube member 100, is identical to that disclosed in Uglow U.S. Patent No. 4,799,713, issued January 24, 1989 and, for the same, Figures 4 to 9 which do not show the vent tube member 100 is the prior art. Figure 1 showing a roof drainage unit according to the present invention, comprises an insert member 10 for roof drainage including a vent tube member 100, a clamping ring member 12, a retaining basket 14, a sealing ring 16 and a flange 18. The unit is shown in Figure 1 in the context of a generally inclined roof 20 supported by means not shown and below which is located a drainage tube 22 also supported by means not P1062 / 99MX shown. A thin water-impermeable sheet 23 covers the ceiling 20. The insert member 10 for roof drainage is sealed to both the sheet 23 and the drain pipe 22 and serves to transfer the water collected in the ceiling to the drain pipe 22 The drainage insert member 10 has a cylindrical tube portion indicated generally as 24 with an upper opening 26 at its upper end and a lower opening 27 at its lower end. The member 10 also has a thin flat flange 28 which extends radially outwardly around the upper opening 26. The flange 28 is secured to the ceiling 20 by screws 30. The retaining ring member 12 overlies the flange 28 and is the tab 28 is secured by holding the sheet therebetween by screw members 60 which extend through the receptacle-forming members 44 of the clamping ring member 12 to engage the post members 34 of the flange 28. The retaining basket 14 is removably secured by snap fit on a ring 64 of the clamping ring member 12. The cylindrical tube portion 24 of the drainage insert member 10 extends downwardly through the end 114 of the upper opening of the drainage tube 22.

P1062 / 99MX coaxially in the drain tube 22. The lower end of the tube portion 24 is sealed to the drain tube 22. While this may be effected in various ways, a preferred construction is shown in Figures 1 and 5 to 7, in accordance with the teachings of U.S. Patent No. 4,505,499, Uglow et al., Issued March 19, 1985. Tube portion 24 is recessed inwardly around lower opening 27 so which provides an annular space 80 therewith for receiving around the tube portion 24 the annular seal ring 16 and the collar 18 in an axially sliding relationship. The washer 18 has three pins 82 radially enlarged and extending inward, each of which carries metal nuts 84 secured therein. Three screws 86 extend from the radial lugs 88 of the tube portion 24 downwardly to engage with the nuts 84 and push the collar 18 upward to compress the seal ring 16 preferably of compressible elastomeric material (rubber). The ring 16 to be compressed will be pushed out towards a sealing coupling with the inner wall 90 of the drainage tube 22, as well as axially towards the recessed annular shoulder 92 which extends radially inwardly of the portion of tube 24. According to P1062 / 99MX is shown, the annular space 80 only has a radially inward extension equal to the thickness of the ring 16 with the exception of three places where it is increased below the pins 88 as in 94 to admit a. the lugs 82 of the washer 18. The lugs 88 have a flat upper surface which can couple the head of the screw 86 between the reinforcement flanges 96. The screws 86 can be accessed through the upper opening 26. The tube member vent 100 comprises a hollow cylindrical tube 102 with an open upper end 104 and an open lower end 106. The vent tube member 100 has two support arms 108 secured thereto and carrying L-shaped member-shaped members 110. best seen in Figure 1, the vent pipe member 100 is secured to the roof drain insert member by the support arms 108 extending to the opening 26 and having its members 110 secured by screw members 60 as opposed to the receptacle forming members 44 and the post members 34. As noted, the tube 102 is coaxially located within both the dr dispose 22 as of the tube portion 24 of the drainage insert member 10. The upper end 104 of the tube 102 is located at a P1062 / 99MX height above the opening 26 in the drainage insert member 10. The lower end 106 of the tube 102 is located below the lower end 27 of the tube portion 24. The unit, as shown in Figure 1, provides, in effect, a primary flow passage extending from the opening 26. of the insert member 10 through the tube portion 24 and out of the tube portion in the drain tube 22. In this regard, it can be seen that the primary passage has segments of different horizontal cross-sectional areas, namely, an input segment indicated as 116, a restriction segment indicated as 118 and an output segment indicated as 120. The tubular portion 24 provides, in effect, an annular restriction within the drain tube 22, such that the area of Horizontal cross section of the tubular portion, especially in the restriction segment 118, is smaller than the horizontal cross-sectional area of the drain tube 22. The cross-sectional area of the p primary gripping increases abruptly as it moves downward from restriction segment 118 to exit segment 120, in the form of an increase step at its junction. The cross-sectional area increased in the P1062 / 99MX output segment 120 immediately below the annular restriction formed by the insert member 10, provides a location where under certain flow conditions, trapped air may remain in the primary passage as water flows through the drain. The tube 102 provides a secondary passage 122 which provides communication through the tube 102 between the upper end 104 and the lower end 106. The upper end 104 is located above the upper opening 26 towards the primary passage, such that under relatively high water flow conditions, the upper end 104 is above the height of the water that can return to the roof. The lower end 106 is located below the restriction segment 118 in the output segment 120 but, preferably, close to the junction between the restriction segment 118 and the output segment 120 to help provide communication with the output segment 120. next, where the primary passage widens or widens to the exit segment 120. The operation of the drainage unit with the ventilation tube member 100 is not completely understood. At low water flow rates, the vent tube member 106 is not believed to have any significant effect on the water flow compared to a unit without the vent pipe member. According P1062 / 99MX increases the flow rate of the water flow, conditions will be reached where the air is trapped in the outlet segment 120 and / or in the entry segment 116 when it is inside the drain tube 22 under the insert member 10 when the greater water flow started or because of being trapped in the water flowing down and released in the outlet segment 120. In a drainage unit without the vent pipe member, trapped air may cause an increase in the resistance of the water to flow through the drain pipe. However, in a drainage unit having the vent tube member, the vent tube provides the second passage to equalize and / or release pressure differences between the ends of the tube 100, such as, for example, to air vent up from the exit segment 120 immediately below the insert member 10 or to allow air to be sucked down through the ventilation tube. As rain can accumulate on the roof in a strong inlet and the water level in the roof can rise with an increase in buildup, the vent pipe can easily help balance the pressures by venting the air while the upper end 104 is by above the water level. By the time the water level can rise above the upper end 104 of the tube 102, the air ventilation P1062 / 99MX will probably be practically complete, so that when the water level is above the upper end 104, most of the air can be removed from the system and the water can fill and flow down both the primary and the primary passage. the secondary passage. The preferred embodiment illustrated in Figure 1 is generally approximated to a unit with a drain tube 22 with an internal diameter of 3 inches for a cross-sectional area of approximately 7.1 square inches, an insert member 10 with a segment of restriction 118 with a diameter of approximately 2.5 inches for an area of approximately 4.9 square inches; an entry segment with a diameter of approximately 2.75 inches for an area of approximately 5.9 square inches; and an outer diameter tube 100 of approximately 1/2 inch and internal diameter of approximately 3/8 of an inch for an internal cross-sectional area of approximately 0.11 square inches. Preferably, the area of the secondary passage is substantially smaller than that of the primary passage. Preferably, the cross-sectional area of the secondary passage is less than 10%, preferably less than 5% of the cross-sectional area of the drain pipe 22. Conventional ceiling drain pipes, P1062 / 99MX such as 22 very commonly have an inner diameter in the range of about 3 to 6 inches. Typical roof drain inserts having annular sealing rings such as 10 can be expected to have diameters in their restriction segment of at least about one-half inch less than the diameter of the drain pipe. For a 6-inch drain tube, this represents approximately 23% less cross-sectional area in the restriction segment than in the outlet segment and, for a 3-inch drain tube, this represents approximately 30% smaller section area cross section in the restriction segment than in the exit segment. The present invention is therefore preferable for use in drainage units in which the annular restriction represents at least about 15% reduction in the cross-sectional area of the drainage tube 22, more preferably, at least approximately one reduction of 23%. In conventional drain pipes of approximately 6 inches to 3 inches in diameter, vent pipes having various cross-sectional sizes can be used. Preferred vent pipes have an internal diameter in the range of 0.25 inches to 1 inch, more preferably, approximately 3/8"to 5/8". The section area P1062 / 99MX of the drainage tube 22 is preferably approximately 30 to 100 times the internal cross-sectional area of the ventilation tube. Figures 1 to 3 show vent tube 102 located coaxially centered within drainage insert member 10. This is not necessary. Ventilation tube 102 could be provided in other locations, for example, adjacent a side wall of drainage insert member 10, possibly secured by a screw 60 at its top. The secondary passage could be integrally provided on the side wall of the drainage insert member and could be provided on the inside and outside or on the inside and on the outside of the side wall of the drainage insert member. The upper end 104 of the ventilation tube 100 in the preferred embodiment shown, is located above the opening 26 approximately between 20% to 100% of the diameter of the drainage tube 22, still below the top of the drainage basket. retention 24. The lower end 106 of the vent tube 100 is preferably located at a distance below the end of the restriction segment 118 between about 20% to 100% of the diameter of the tube.

P1062 / 99MX drain 22. The preferred vent tube 100 is shown secured in place, namely, by support arms 108. Additional support and / or locating devices could be provided so close to the lower end 106 to maintain the tube of ventilation 100 in a desired location. However, it is preferred that any support devices are minimized so as not to restrict the flow of water or the flow of waste through the drain. Other features of the roof drain insert shown in Figures 4 to 9 will be discussed in more detail below. Referring to Figure 4, the flange 28 has recessed bores 30 circumferentially spaced therein, through which the recessed head screws 32 extend to secure the flange 28 to the roof 20 with the lower surface of the flange 28 in a location abutting the upper surface of the roof 20. The flange 28 cuts six post members 34 that extend upwardly beyond the top surface 36 of the flange 28. Each post member 34 is shown to be substantially cylindrical and having a central opening 38 extending downwardly towards the post member 34. The central opening 38 does not extend P1062 / 99MX completely through the flange 28 but rather ends up as a blind end 40. The clamping ring member 12 overlaps the flange 28, such that the central opening 42 through the ring member 12 provides access to the tubular portion 24 through the upper opening 26. Important portions of the ring member 12 are relatively thin and flat. In the ring member 12 six receptacle forming members 44 are provided, each is raised above the upper surface 46 of the ring member 12. Each of the receptacle forming members 44 defines therein a receptacle recess. 48. The recess 48 has a lower opening 50 in the lower surface 52 of the ring member 12. The receptacle forming members 44 constitute a generally cylindrical vertical wall 58 which at its upper end preferably extends radially inwardly to provide a flange 56. extending inwardly at the top of the member 44. An inlet opening extends downward through the top of each member 44 toward the receptacle recess 48. The receptacle-forming members 44 are complementarily located having a relation with P1062 / 99MX with respect to the location of the post members 34, so that each receptacle recess 48 can receive therein a post member 34. The screw member 60 extends downwardly through the upper part of the receptacle-forming member 44 through the entry opening and towards the central opening 38 of a post member 34 received inside the receptacle recess 48. The screw member 60 engages with the post member 34 to push the member of the receptacle member. ring 12 on the flange 28. Preferably, the screw member 60 carries a collar 62 to distribute the loads on the receptacle forming member 44. When the sheets 23 are located between the flange 28 and the ring member 12 circumferentially around the flange 38, the sheets 23 can be clamped between the ring member 12 and the flange 28 to form a seal completely around the periphery of the unit of drainage. Although not necessary, the screws 32 that fasten the flange 28 to the roof 20 can be located under the sheets 23 and at a level with the upper surface of the flange 28. The ring member 12 is preferably provided on its outer edge with a ring segmented P1062 / 99MX 64 extending vertically upwards (axially above the upper surface 46 of the ring member 12 where the ring 64 has an outwardly extending radially extending flange lip 66. The ring 64 it is shown as a plurality of circumferentially separated segments, each designated 64 separated by vertical spaces or cut or cut portions 70 extending down to the height of the upper surface 46 of the ring member 12, as best seen in Figure 4. When used to secure the roofing sheets 23, the spaces 70 allow water to pass through the ring 64 when the water merely rises up to the height of the upper surface 46 of the ring member. While Figures 1, 4 and 8 show the use of a drainage unit in its preferred use with roofing sheets 23, the drainage unit can also be used with a roof sealing system of asphalt type as shown in FIG. Figure 9, in which a layer 72 of tar, asphalt or other sealant, preferably covered with gravel 74, can be emptied directly onto the roof 20. In this case, the ring member 12 is pushed directly on the flange 28. The segmented ring 64 serves to help the asphalt or P1062 / 99MX tar 72 and gravel 74 enter the drain. In order to securely hold the sheets 23, as seen in Figure 4, the lower surface 52 of the ring member 12 may have one or more angled flanges 98 extending downwardly. Preferably, ribs 99 located and dimensioned in complementarity can be provided on the upper surface 36 of the flange 28 to help secure the sheet 23 and, also, as shown in Figure 9, when there is no sheet between the ring member 12. and the flange 28, for admitting or housing the flanges 98. The drainage unit preferably has a retaining basket 14 which prevents sheets, needle-like leaves of the pine, paper and the like from entering and plugging the drain. It is shown that the basket 14 has a lower peripheral edge 75 with an internal projection 76 extending downwardly to come into close contact with the radially inner surface of the ring 64. Preferably, in the basket 14 three engaging members 77 are provided, as seen in Figure 1. The hook members 77 engage under the lip 66 to securely hold the basket 14 on the ring member 12. As the basket 14 has some resilience, the basket 14 can be adjusted and thrown away under lip pressure 66.

P1062 / 99MX Preferably, each of the drainage insert member 10, ring fastening member 12, retaining basket 14 and washer 18 can be molded from plastic such as by injection molding. The particular configuration of the pole members allows the molding of the drainage insert member with a two-piece mold where the tube portion is reduced downward by a very small amount. One piece of the mold can provide the upper and inner surfaces while the other part of the mold can provide the lower and outer surfaces of the tube portion 24. By providing the pole members and the receptacle forming members to be vertical about of the upper surface of the flange and of the clamping ring member, it is advantageous, since the asphalt, tar or other sealing materials will be applied and will often have a slope in a drain, making the location of the screw holes difficult. . With post members having a blind end and effectively sealing the thread or rope portion of the screw member 60, corrosion of the screw member can be removed more easily after passing time, if necessary.

P1062 / 99MX In the preferred embodiment shown, the pole members and the receptacle forming members are shown as cylindrical. It will be appreciated that many other complementary forms could also be used. While the invention has been described with reference to preferred embodiments, the invention is not so limited. Many variations and modifications will occur to those skilled in the art. For a definition of the invention, reference should be made to the appended claims.

P1062 / 99MX

Claims (17)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following CLAIMS is claimed as property: 1. An insert for drainage of roofs having a tubular portion with an exit end lower adapted to be secured within a large diameter cylindrical drainage tube, (a) the tubular portion has an upper entrance end, (b) a sealing flange that engages with the upper part of the roof extends radially outward from around the upper inlet end of the tubular portion to prevent the flow of water therethrough by another route than the upper inlet end, (c) an annular sealing ring located around the tubular portion near the lower outlet end to form a seal between the tubular portion and the drainage tube, (d) an air ventilation tube secured to the insert extending coaxially within the ins from one end of the upper tube upwards, above the upper entrance end of the tubular portion until P1062 / 99MX a lower tube end below the lower outlet end of the tubular portion.
2. 2. An insert for roof drainage according to claim 1, wherein the sealing ring comprises a compressible ring member, the insert includes a mechanism for applying compression forces to the ring member annularly around it, (a) the A ring member subjected to the compression forces applied by the mechanism that engages the tubular portion to form a seal therewith, expands radially outwardly to seally engage the drain tube.
3. 3. An insert for roof drainage, according to claim 2, including an activating means for activating the means for applying compression forces, the activation means is accessible for actuation through the upper entrance end of the tubular portion.
4. 4. An insert for roof drainage according to claim 3, wherein the sealing ring comprises an elastomeric and compressible material.
5. A roof drainage insert according to claim 3, wherein the radially inwardly directed flange is provided in the tubular portion near the lower outlet end, the sealing ring has a portion at an axial end thereof for coupling P1062 / 99MX with the tab facing inward and subject to compression by the mechanism to form a seal with it.
6. A roof drainage insert, according to claim 5, including a washer member, wherein the ring member is axially located between the inwardly directed flange and the washer member, so that to be sandwiched between them , the mechanism comprising an axially extending force transmitting means is coupled to the flange member with the flange facing inward, for activation by the activation means to apply axially directed compressive forces to the ring.
7. 7. A drain comprising: (a) a vertically extending primary drainage passage for the flow of water vertically down therethrough, (b) a more superior drainage inlet opening that opens toward the primary passage for the entry into the roof water, (c) an annular restriction member disposed or located within the primary passage blocks the flow of water therethrough and does not block the one passing through the central vertical restriction segment of the primary passage defined centrally within the member of P1062 / 99MX annular restriction, (d) the primary passage has a vertical exit segment immediately below the annular restriction member, the exit segment having a horizontal cross-sectional area greater than the horizontal cross-sectional area of the restriction segment and the opening of the restriction segment opens directly towards the exit segment at the junction between them, (e) a secondary passage that provides communication between a top opening located at a height vertically above the drainage inlet opening and a lower opening located within the primary passage in the exit segment near the junction between the segment of restriction and the exit segment, (f) the secondary passage has a horizontal cross-sectional area for the flow therethrough, which is smaller than the cross-sectional area of the exit segment.
8. A drainage according to claim 7, including a hollow tube member coupled to the drain that extends vertically within the primary passage, from an upper end above the drainage inlet opening through the restriction section to a lower end located within the outlet section, the secondary passage is provided within the tube member P1062 / 99MX and the upper end of the tube member comprises the opening superior to the secondary passage and the lower end of the tube member comprises the lower opening to the secondary passage.
9. A drainage according to claim 8, wherein the primary passage has a vertical entry segment immediately above the annular restriction member, the vertical entry segment having a horizontal cross-sectional area greater than the horizontal cross-sectional area of the restriction segment.
10. A drain according to claim 9, wherein the inlet segment extends from an inlet opening of the drain to the restriction segment.
11. A drainage according to claim 7, including a cylindrical vertical drainage tube with an open upper end, (a) a drainage insert comprising a tubular portion with an upper and lower open end and an upper flange extending radially outwardly from around the upper end of the tubular portion, (b) the drainage insert is secured to the drainage tube with the tubular portion extending coaxially towards the upper end of the drainage tube P1062 / 99MX and the radially outwardly extending flange seals the upper open end of the drainage tube for water ingress, by way other than the upper open end of the tubular portion, (c) the tubular portion comprises a restricting member cancel.
12. 12. A drain according to claim 11, wherein the annular restriction member comprises the lowermost portion of the tubular portion.
13. A drainage according to claim 12, wherein the annular restriction member includes a ring-type sealing member coaxially located between the drainage tube and the tubular portion to form a seal therebetween.
14. A drainage according to claim 13, wherein the annular restriction member includes a ring-like member that engages the tubular portion to form a seal therewith, wherein the ring-like member when compressed by axially directed forces, it expands radially outwardly to engage sealingly with the interior surfaces of the drainage tube and the drainage includes a mechanism for axially compressing the ring-like member.
15. 15. A drain according to claim 8, comprising a roof drain. P1062 / 99 X
16. 16. A drain according to claim 11, comprising a roof drain.
17. 17. A drain according to claim 14, comprising a roof drain. P1062 / 99MX