AU607458B2

AU607458B2 - Self-collecting, cantilevered water tank roof with support brackets and tilted, internal conical tank lid with leaf filter.

Info

Publication number: AU607458B2
Application number: AU10398/88A
Authority: AU
Inventors: John Joseph Jones; Lawrence John Jones
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-01-20
Filing date: 1988-01-19
Publication date: 1991-03-07
Anticipated expiration: 2008-01-19
Also published as: AU1039888A

Description

liii 11111- 11111 11111 Hill "III- iili 4_UTRLI X 58 P/00/011I Form PATENTS ACT 1952 COMPLETE SPECIFICATION

(ORIGINAL)

FOR OFFICE USE Short Title: Int. Cl: p _kDqqcoo Application Number: Lodged: (q 7 Complete Specification-Lodged: PAT ENT OFFICE Accepted: Lap!;ed f Publishiad: "o!1I1wed Art: FIE AS This"1docu t on ti1s tY ~pLAS anneaidments nmd'e tndc Scction 49 a~d' is corrcca ft TO BE COMPLETED BY APPLICANT Name of Applicant: JOHN JOSEPH JONES AND LA~WRENCE JOHN JONES Address of Applicant: s; LOT 87 ,FALLS ROAtD, HO\IEA W.A. 6071 U Telephone (09) 2954269 Act'ual lnventor JOHN JOSEPH JONES A~ND LAWURENCE JOHN JrINES e~ i 4 Address for Service: L-e--a8- 1 -HOJE 7 4

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Complete Specification for the invention entitled: SELF-COLLECTI NG, CA 1 NT ILEVERED WA.TER TA~NK ROOF WiITH SUPPORT BRA~CKETS AND TILTED IIINTERN 1

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CONICAL TANK~ LID WITH LEAF FILTER The following statement is a tuil description of this invention, including the best method of performing it known to me:-.

Note: The description is t6 be typed in double spacing, pica type face, in an area not exceeding 250 mm in depth and 160 mm in width, on tough white paper of good quality and it is to be inserted inside this form.

14599/78-L 14599/ a- LPrinted by C. J. THOMPSON, Commonwealth Government Printer, Canberra I *I* TO ,fr THE COMMISSIONER OF PATENTS% This form must be accomp~anied by tzher a provisional specifica~tion (Form 9 and true c c t ipecifkcation (Formn 10 and true cop'iL

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1- A ROOF EXTENSION FOR A STORAGE TANK r C 0 t The present invention relates to a roof extension particularly, although not exclusively, envisaged for use with a storage tank, such as, for example, a water storage tank.

The roof extension is particularly envisaged for use in collection of water for the storage tank and provision of shade about the storage tank.

Water supplies for domestic and farm stock use in many parts of the world are drawn from groundwater, riverine and lake catchments which are of ten heavily polluted and which are the source of fatal or crippling diseases. In "Third World" countries, stock are watered at the same sources which supply humans. In Australia, farm stock drink from saline bore supplies or from carthen dams which receive saline and other undesirable mineralised constituents from soil run-of f, as well as the urine and faeces shed by animals together with bacterial and viral matter from their bodies. The bad effects of the accumulation of such undesirable matter can only be ameliorated by the heavy and expensive use of chemicals. The entry of stock into earthen dams cause,,7 excessive turbidity in the water, causing an even greater ingestion of damaging elements by stock.

Earthen dams are costly to build; concentrate a large body of water in one place; suffer constant damage from stock use and weather; are increasingly costly to maintain; require excellent fencing for effective conservation; have incipient and increasing salinity problems; lose a large proportion of their water by soakage and evaporation; often cannot be sunk in the best location for stock use; cannot be covered; do not receive rain from light summer falls on their catchment areas; do not receive dew from their catchment areas at all; cause stock to die in bog traps; and need chemical additives to prevent colic and other intestinal diseases in stock.

Tank storage of water has many advantages over dam storage and tanks are a familiar feature of rural landscapes.

However, the nature of present water storage tanks is that they k L2 (Signet reof 'rIlE COMMISSIONER OF PATENTS.

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either receive water from a ancillary catchment surface, such as a house or shed roof (which water is fouled by animal faeces) or they are filled by pumping from bore, rivering or lake sources and in some instances by artesian pressure.

Tanker delivery of water is also often a costly aspect of both human and stock survival in rural areas.

It is to be noted that generally rooves of prior art storage tanks have been designed with the sole purpose of shedding water. We have discovered thaz the area of the roof can provide for collection of significant amounts of rain water for the purpose of later use by live stock or humans.

It is therefore an object of the present invention to provide a roof extension for a storage tank particularly for collection of rain water for the storage tank.

In accordance with one aspect of the! present invention there is provided a roof extension for a storage tank having an endless wall, the roof extension comprising support means for supporting the roof extension upon th~e endless wall, the support means being attachable to the endless wall, and a web mounted upon the support means for forming an inclined water collection surface, whereby, in use, the water collection surface projects outwardly from the endless wall such that the inclination of the water collection surface causes water falling upon the water collection surface to be directed into the storage tank.

Preferably, each support means has a leg disposable proximate the endless wall and a top arm extending from the leg and directed upwardly at an acute angle to the horizontal at the top of the endless wall so as to dispose the panel members such that the water collection surface is concave when viewed in plan.

Preferably, each attachment means includes a plurality of location elements, such as, for example, location lugs, to match with. corrugations of the endless wE,ll to inhibit movement of the leg up and down with respect to the endless wall. Preferably, each attachment means also includes a top projection, such as, for example, a top hook, to sit over the top of the endless wall to further inhibit movement of the leg CC C C

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,~ii -3vertically downwardly. The attachment means also includes a plurality of 'compression hoops, such as, for example, compression rings, to urge the location elements into the troughs of the corrugations and to thereby attach the roof to the endless wall.

Preferably, adjacent panel members coupled together at adjacent edges. Preferably, adjacent edges of the panel members have complementary sections capable of location one upon the other. Preferably, complementary sections, once overlapped in plaice, leave a vertical clearance to the remainder of the panel member such that the panel members, once coupled together, are water proof up to the height of the clearance.

Preferably, the water collection surface is inclined inwardly. Preferably, the water collection surface is also annular and conical so as to be generally circular in -hape and having an open centre.

C C fPreferably, the roof includes an internal tank lid disposed to close off a top of the storage tank. Preferably, ~0a part of the internal tank lid is inclined to the horizontal 11so as to direct collected water to a low point. Preferably, the internal tank lid has a lid base which is convex when viewed from above and inclined to the horizontal. Typically, the lid base is an inverted cone. Preferably, the internal tan~k lid is disposed to sit over the endless wall of the storage tank.

Preferably, the roof includes a filter through which Vthe water is intended to pass in order to remove debris from the water. Typically, the filter is located approximate a low area in the lid base.

One embodiment, being an example only, of the present invention will now be described with reference to the accompanying drawings, in which:- Figure 1 is a plan view of a roof extension according to the preferred embodiment, having panel members removed for clarity; Figure 2 is a part sectional side view of the roof of K'VT 0 b 4 4 Figure 1 shown in relation to a storage tank; Figure 3 is a cross-sectional side view of the storage tank of the present embodiment shown attached to a storage tank; Figures 4A to 4C show part perspective views of panel members of the roof extension as shown in Figure 3; Figure 5A is a plan view of the roof extension of Figure 1; and, Figure 5B is a schematic side view of an attachment means for the roof extension of Figure 1.

"Cantilevered" in the context of the present embodiment is taken to mean that the panel members of the roof extension extend radially outwardly over the endless wall of the storage tank.

9 4 V 65 St I Description of Components; Tilted, Internal, Conical Tank Lid.

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(See drawing one, Figure 1; drawing two, Figure 2; drawing three, Figure 3) The lid is made of galvanised steel.

It has a conical base of an included angle of 170 degrees in convex aspect set inside a cylinder with the base of the cone having an inclined plane of 7 degrees. The cylinder fits inside the tank diameter. The cylinder has a circular, channel t section rim with a top sloping inwards at 7 degrees. The S channel section rim fits over the hooks of the cantilever support brackets and the tank wall.

The tank lid protects the stored water from evaporation and windborne debris and directs precipitation to the filter, which is -4I *1 e, Lc. .1 L i L1I ~-itt~L- rrY-- r located on the edge of the lid base at its lowest point. The convex cone strengthens the base against heavy rainfall. The sloping top face of the rim acts as a splash guard for water running off the cantilever and completes the seal of the tank top.

Leaf Filter: (See drawing one,figure 1; drawing three,figure 3 The filter is made of galvanised mesh over a wire frame. It is cylindrical in shape and at its lower end has a smaller diameter register which fits into a flanged hole in the conical lid base.

The filter is mesh covered at the ends. It has a diameter one sixth of the tank diameter.

o Joint Cantilever Panels: 0 0 o S (See drawing three, figure 3;drawing four,figures 4a,4b and 4c; 0o o drawing five,figures 5a and 5b.) The cantilever panels are made of 00 0 0 00 galvanised steel. There are eight panels to each cantilever roof.

0o°° The cantilever,when assembled,extends from the outside o circumference of the tank for a distance of one half of the diameter of the tank.In Plan View,(drawing five,fig 5a) it is seen as a plane surface with a circular shape and open centre.In Side o0oo Elevation (drawing three,figure 3) the plane surface is seen as an 0o0.0 inclined plane of 7 degrees ,draining inwards with flat-topped o 00D ridges made by the clipover joints.

0 A clipover joint occurs at each end of a cantilever panel the ends of which are cut radial to the tank diameter. The right- 0. o hand end piece, is slightly larger than the left -hand end piece so that the right-handpiece clips over the left-hand piece.. A water -tight joint is provided up to the height of the lowest clipover piece (approx. 25 mm ).The top piece springs open and closes over the lowerpiece ,or one may be slid into the other from the side.The joint is 40 mm wider than the cantilever bracket on which it rests to permit adjustment in assembly. The cantilever is bolted to the bracket through two slots in the brackets which are parallel to the arm of the bracket and 90 degrees to panel slots.

Si-' -II -L 1 ;I Hooked,Cantilever Bracket: (See drawing two,figure The hooked cantilever bracket is made from 50mm x 5mm steel bar which is galvanized after fabrication.There are eight brackets to a cantilever roof.The bracket has a vertical,hooked leg which hangs on the outside of the tank.The leg reaches to the bottom of the tank and is hooked at its base outwards to hold the lower compression ring during assembly.From the upper part of the vertical leg the top of the bracket is projected outwards.It has an included angle of 97 degrees to the vertical plane of the bracket.The top arm of the bracket is supported by a 45 degree angle strut between the vertical leg at about mid-point,to the top of the bracket at a point close to the outside circumference of the cantilever.The o bracket also has a short support strut joining the two vertical o legs of the bracket at a point close to the radius of the top hook hook.

0 a o o on o o o O o 0 0 o a 0 0 00 0 0 0 0 00 0o a 0 0 o 0 o 0 J40 0 Corrunation Bracket Lugs: (See drawing two, figure The corrugation lugs are made from steel rod.There are two lugs to a cantilever bracket,sixteen in all. They are galvanized after machining. Each lug has a halfround headwhich fits into the concave corrugation of the tank wall.

A 6mm stud is integral with the lug. The stud passes through a slot in the bracket's hooked leg:andthe nut is tightened when the lug is in the correct position in the corrugation. On a flat-sided tank the lugs are not required.

Half-Circle Compression Rings: 0 0 (See drawing two,figure 2.)There are two compression rings to each tank.The rings are made of 10mm galvanized steel rod.Each ring is made in halves.Each half has a joining lug on one end at right angles to the circular axis.Each lug has a clearance hole for a bolt.When the halves are in position ,the bolt is tightened At the other end of one half is a right hand thread 70 mm long.

The joining end of the other half has a left hand thread of the same length.When drawn up tight, the halves have a total length that is less than the circumference measured around the outsides of the legs of the assembled brackets. The halves are drawn -6together by a long nut .The nut hns a right-h2nd thread at one end and a left-hand thread at the other end. The compression rings hold the bracket legs vertical and tight against the tank side. They strengthen the tank against wind forces and prevent the tank from yawing when empty.

Tilted, nternal,Conicl .Tank Lid The cone is best made from a sheet of galvanized steel thick it has a lipped base edge for rolling onto the inside face of the rim.The filter hole is cut out by profile cutter and the cone joined at its seem by seam rolling.

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10 The internal face of the rim is made from a wide strip of galvanized steel .An internal right angle lip is folded along the top edge and an external right angle lip is folded at the bottom edge.The lipped strip is thenrolled into a cylinder by seam rolling, and joining at the vertical ends. The outside vertical'face of the rim,which sits cutside the tank,is made from a plain wide strip and seamrolled at the joint with the top,sloping face of the rim The lipped cone is placed inside the lipped rimand sits on the lip of the rim.The lip of the cone is t c rivetted to the lip of the rim.

The top face of the rim is made by profile-cutting a circle of galvanised sheet.

The outside face of the rim is clearly marked into eight equal C sections to enable the eight cantilever brackets to be accurately located.

If the tank lid is made from plastic it is best made in four identical section for the rim with a conical base moulded suparately,the whole assembly being then glued together.

Lnaf Filter: SRA This is best made by shaping a cylinder of galvani7Rd mesh of the V iil:l .^.Vt.HCly same diameter as the frame to which the filter mesh will then be soldered.The ends of the mesh cylinder will be closed by soldering mesh over them.

The Cantilever Panels There are eight cantilever panels to each cantilever roof.

Each panel is made by profile cutting in layers.The radiallycut ends are then folded on folding jigs to the required 'Z' shape.The bolt holes for fixing to the bracket are punched.

If made from plastic,the panel is best made in one injection moulding.

o °o The Cantilever Brackets: o€ 10 There are eight cantilever brackets. Each bracket is made from d a' 0 50mmx5mm steel bar which is galvanized after fabrication. The 0 o S top of the main vertical leg is hooked at the top so that the o oo.' hook fits over the edge of the tank wall freely.The bottom end of the leg is hooked upwards to the outside face of the leg.The internal diameter of the hook is clearance for the 10 mm rod o compression ring. The triangular section of the cantilever support bracket is made by bending a length of the bar to an o° included angle of 97 degrees .The triangular section is then completed by welding a base section which extends to join the 0o 20 hooked,vertical leg at about mid-point.It is welded at this point.

An intermediary support strut is welded between the face of the hooked,vertical leg and the vertical side of the triangular o 1 section.

Half.Circle Compression Rings And Nut: The half-circle rings of 10 mm steel rod are first threaded right and left hand thread alternately having a thread length of mm. The rods are then drum formed into half circles, The lugs for bolting are first drilled and then welded at right angles with the lug to the outside diameter of the rod. The long nut is made from hexagon rod. It is cut by parting in a turret lathe drilled and screwed internally,one end with a left hand 10 mm -8r i thread and then taken out and turned end-for-end and screwed internally with a right hand 10 mm thread.The length of the nut is 150 mm. It is galvanised after threading.

Other Components Used: All other components are available commercially through normal trade suppliers.

ASSEMBLY OF CANTILEVBR AND TILTED INTERNAL CONICAL LID FILTER AND BRACHETS.

1. Loosely bolt:corrugation lugs to cantilever brackets o 2.Hang the cantilever hooks over the tank edge with the cantilever outwards.Group hooks together and slide top compression ring through.

S 3.Lift the inclined ,internal,conical tank lid into position.

4. Line up the brackets with the marks on the side of the lid rim.

o 5. Place the filter in position.

S 6. Adjust and tighten corrugation lugs to match tank corrugations.

So 7. Place bottom compression ring in place and loosely tighten.

o00 Check legs for vertical and radial alignment and location against marks.

8.Place top compression ring in place and re-check vertical and o oa radial alignment and location against marks.Loosely tighten nut, o a 9. Pull up comression rings evenly and firmly .Final tightening 0 ao is done when cantilever panels are bolted.

10. Place the first cantilever panel into position with the joint slots over the tops of two adjacent cantilever brackets, 11.From the outside circumference of the cantilever slide the 0.00 ao" o next joint right-hand end over the left -hand end of the panel e. oo. already in position and bolt loosely.

12. Repeat the process described in item (11) up to the last-butone panel.

13. Push the final panel into position from the top by springing r, open each top joint and pushing downwards until the clips mate. I 14.Tighten cantilever bolts through panels to brackets.

15. Tighten top and bottom compression rings with right and left hand long nut.

16.Attach mooring cables to eye bolts and anchor suitably. Bags with earth may be tied to vertical legs.Meep 100mm of water in tank.

-9- :i 1 ii-i ~Y 10 The roof may particularly be circular, inclined and cantilevered for draining inwards and projecting outwards from the tank wall for not less than half the diameter of the water tank on which it is built, and projecting inwards as far as required, made of eight panels of galvanised steel 1 mm thick the ends of panels being radially cut to equal length, each end being folded to make a raised double clipover joint through which double joints the panels are bolted to eight supporting cantilever brackets hung by their top hooks over the top edge of the water tank the bracket'legs being located relative to the tank corrugations by radiused corrugation lugs bolted to the vertical legs of the brackets, the legs being clamped against the tank wall holding the brackets in correct position relative to the cantilever roof by the top and bottom compression half-circle rings joined by a bolt through two right-angle lugs, one at one end of each half-circle, the ring being drawn tight around the outside circumference of the vertical legs against the tank side by tightening-up the right and left-hand threaded long nut on the threaded ends of the 113 half-circle rings, the cantilever being used either by itself on an existing tank, or used in conjunction with a tilted, internal, conical lid.

The cantilever bracket may particularly be made of ttC 50mmx 5mm steel bar galvanised after fabrication, the hooked leg being the height of the existing water tank and shaped at the' top into a hook fitting over the thickness of the ,C corrugated or plain tank wall and having the bottom end bent upwards and outwards forming a small hook of 10 mm clearance d to receive the bottom half-circle compression ring, this hooked 0 vertical leg having adjustment slots vertically-aligned for receiving the corrugation lug studs and being paralleled by a second vertical leg at a space of 60 mm rising upwards from the mid-point of the hooked, vertical leg to a level 30 mm above the top of the hook, the second vertical leg then bends parallel to its transverse axis in an inclined plane of 97 degrees to its longitudinal axis, continuing outwards radial to the tank for a minimum distance of half the water tank's R diameter to reach the outside circumference of the cantilever _r :i i.

-11from which point it bends downwards as a support strut at an angle of 41.5 degrees to the mid-point of the hooked, vertical leg and in the process making tangential contact with the bottom end of the second vertical leg, all of these joints being welded and the top 97 degrees arm of the bracket having mm clearance slots parallel to the longitudinal axis of the arm.

The panels may particularly incltde raised double 'Z' joints comprised of two opposed 'Z'-shaped sections 1000 mm wide or whatever width required, having three included angles of 70 degrees to each section with the top face of each section being parallel to the inclined plane of the integral cantilever panel and having a narrow lip of 10 mm width bent downwards and inwards at an included angle of 70 degrees, both sections being radial to the cantilever circle with the right-hand end 'Z' section being smaller in overall dimension than the left-hand end section, allowing the left-hand end section to clip i over the right-hand end section to form the complete double 'Z' crage l joint 25 mm high and open at the base, showing a section end 0" 0 view of an upside-down channel with inward-sloping sides in a radial aspect relative to the cantilever circle, the double 'Z' joint being slotted through to permit bolting to the top arm of the cantilever bracket.

The tank lid may particularly be tilted, conical and 25 in a convex attitude to the tank and circular in shape made of 1 mm galvanised sheet steel having a diameter 100 mm less than the inside diameter of the water tank corrugations, the internal, conical base being lipped outwards and inclined in a plane of 7 degrees to the horizontal and enclosed by and joined to a lipped top face 12 mm wide having an ascending, inclined plane of 7 degrees outward, this being joined at its outside circumference by a lipped cylinder descending vertically from the top, inclined face, to a depth of 100 mm, completing a circular channel, all joints being seam rolled or riveted and soldered, the circular channel rim sitting over the top edge of the existing tank, the lid being provided with a filter hole of 300 mm at the lowest point of the conical base and this hole being flanged with a collar 50 mm deep.

4 12 The compression ring may particularly be made of mm steel rod galvanised after thread cutting, in halves jointed at one end of each rod by a lug on the rod end at 90 degrees to the axis of the ring and bolted through to tighten against the lug at the end of the other half-circle and having at the other end of one rod a left-hand thread 70 mm long and at the other end of the other half-circle a right-hand thread 70 mm long, the complete ring itself being of lesser circumference than the circumference measured around the outside of the cantilever leg brackets against the tank wall, both screwed ends of the half-circles being joined by a 10 mm right and left-hand thread long drawing-up nut made of 25 mm hexagon rod and galvanised after threading.

The filter may particularly be made of 3 mm square 5 mesh and 3 mm wire, 300 mm in diameter forming a cylinder 300 mm high joined to a smaller cylinder 250 mm in diameter and mm high, the mesh soldered to a welded wire framework of cylindrical shape, the ends being covered with mesh, the whole 'eCI t filter being galvanised after fabrication and made to be a O push-in fit in the flanged collar of the cone.

It is to be noted that typically the components of the roof of the present embodiment are made from galvanised metal material although other materials such as plastic Tt~t material or fibre glass or the like could be used for some or 25 all of the components.

It is an advantage of the present invention to utilise the endless wall of a storage tank to provide support for cantilevering a catchment type roof to enlarge the potential of uncovered tanks to collect rain water and so provide a significantly greater volume of soft rain water. The roof provides a seal inhibiting the entry of animals into the storage tank and offers an unattractive habitat for such animals. The conical tank lid retards evaporation of the stored water and the removable filter permits easy cleaning of leaf and other foliage. The roof also provides shade for the walls of the storage tank so as to further reduce evaporation of water therein and to provide welcome cover for livestock.

Further advantages of the invention are: i

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r -12 The compression ring may particularly be made of mm steel rod galvanised after thread cutting, in halves jointed at one end of each rod by a lug on the rod end at 90 degrees to the axis of the ring and bolted through to tighten against the lug at the end of the other half-circle and having at the other end of one rod a left-hand thread 70 mm long and at the other end of the other half-circle a right-hand thread 70 mm Slong, the complete ring itself being of lesser circumference than the circumference measured around the outside of the cantilever leg brackets against the tank wall, both screwed ends of the half-circles being joined by a 10 mm right and left-hand thread long drawing-up nut made of 25 mm hexagon rod and galvanised after threading.

The filter may particularly be made of 3 mm square mesh and 3 mm wire, 300 mm in diameter forming a cylinder 300 mm high joined to a smaller cylinder 250 mm in diameter and mm high, the mesh soldered to a welded wire framework of cylindrical shape, the ends being covered with mesh, the whole 4rrt ~filter being galvanised after fabrication and made to be a S push-in fit in the flanged collar of the cone.

It is to be noted that typically the components of the roof of the present embodiment are made from galvanised metal material although other materials such as plastic material or fibre glass or the like could be used for some or all of the components.

1 RA Further advantages of the invention are: 7.

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to me:-' Note: The description is t6 be typed in double spacing, pica type face, in an area not exceeding 250 mm in depth and 160 mm in widith, on tough white paper of good quality and it is to be inserted inside this form.

1 4599/78- L Printed by C. I. THOMPSON, Commonwealth Government Printer, Canberra b 13 t C 0 0 0C 0 0 0 006 301

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0 j1 a. to catch rainwater and dew fall at their inherent levels of purity by providing a conical, inclined, inward-draining catchment surface of non-corroding material that fits existing tanks; b. to greatly increase, such as by three times, the catchment area of existing tanks and to provide shade for the tank wall and for stock by adding a cantilever roof; C. to store the precipitation caught in roofed and shaded tanks that have low evaporation rates and which contain the stored water without decreasing its inherent level of purity and so avoid the need for costly chemical cleansing; d. to provide soft rain water from the tank storage for domestic, stock and limited irrigation and industrial use; e. to enable land to be used for stock which has reasonable feed but which has water salinity problems, or which has heavily-mineralised water unsuitable for stock or humans; f. to provide water that is free of introduced chemical residues from pesticides, fertilisers and other injurious wastes which enter the groundwater; g. to provide a pure water source where other sources are not available on location, or where reticulated supplies are not present; h. to provide a water catchment and storage apparatus that is independent and free-standing and can readily be placed anywhere on flat ground in any number; i. to provide an eas ily-erec table and completely demountable tank lid and cantilever; j. to provide an opportunity for the more efficient deployment of farmers' capital in respect of water provision for stock use. The availability of small, free-standing, self-collection tanks presents an opportunity to re-deploy the large investment required for earthen dam construction and R 41" 14 11 -14 maintenance by building up dispersed water resources on grazing properties in paddocks that are not suitable for earthen dams because of soil or contour factors but which could accommodate above-ground 5 storages; k. to enable a widespread availability of stock watering sources around a property and thus reduce i the walking distances and time taken for stock to reach water daily. This aspect will greatly reduce 1i i 0 weight loss, fatigue and sickness and injury to stock. Erosion of the land will be significantly reduced because of the lesser distance involved in the daily treks for water. In severe temperatures, stock losses from dehydration will be significantly lessened due to lower exertion rates of stock.

The support means of the present invention is preferably constituted by each of the cantilever brackets. The battachment means of the present invention is preferably 'r.t constituted by the top and bottom compression rings and the 0 interference engagement that they provide between the endless wall of the storage tank and the leg of the cantilever brackets. The attachment means is also constituted by the location lugs which are received into the troughs of the Scorrugation of the endless wall of the storage tank. The retainers of the present invention are preferably constituted by the bottom bent end of the cantilever bracket and the space between the two parallel spaced-apart legs of the contilever bracket.

Modifications and variations such as would be apparent to a skilled addressee are deemed within the scope of the present invention.

For example, the angle of inclination of the brackets to the horizontal may be altered provided that the angle is acute and diposed upwardly. Also, the top sloping portion of the channel section rim of the tank lid could be inclined at other than 7 degrees, but preferably, at an acute angle to the horizontal.

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Claims

4. A roof extension according to any one of the c C¢ 00 1 preceding claims in which the water collection surface is C inclined at substantially 70 to the horizontal. 000.1 a 5. A roof extension according to any one of the preceding claims, in which the web is formed of a plurality of panel members coupled together.
6. A roof extension according to claim 5, in which adjacent edges of the panel members have complementary sections capable of location one upon the other whereby, in use, a vertical clearance is formed extending from the overlapping portions of the complementary sections to the remainder of the panel members such that the panel members constitute an open water conduit up to the height of the clearance. A roof extension according to claim 6, in which each Al 16 panel member is planar over its intermediate extent between two ends and has a shaped section located at and extending along its opposite sides, whereby, in use, panel members may be coupled together side by side to form the inclined annular water collection surface.
8. A roof extension according to claim 7, in which each shaped section is inclined to the intermediate extent and a lip at its free edge, whereby, in use, an edge of one panel o o c member clips to the edge of an adjacent panel member. o i 10 9. A roof extension according to any one of the preceding claims, in which each support means comprises a leg or disposable proximate the endless wall and a top arm extending from the leg and directed upwardly, whereby in use, the web is supported upon the top arms of a plurality of the support means such that the water collection surface is concave when viewed 0o in plan. 0 0
10. A roof extension according to claim 9, in which each 09:14 of the support means comprises an upper projection shaped to 41(.sit over the top of the endless wall to provide further J attachment of the roof to the endless wall.
11. A roof extension according to any one of the preceding claims, also comprising an attachment means including a plurality of compression hoops for clamping each of the support means to the endless wall. V 25 12. A roof extension according to claim 11, in which the attachment means also includes a plurality of location elements shaped to match with the profile of the endless wall for inhibiting movement of the support means up and down with respect to the endless wall.
13. A roof extension according to claim 11 or 12, in which the support means includes retainers for retaining the A>4 17 compression hoops.
14. A roof extension according to any one of the preceding claims, comprising a tank lid stationed below an opening in the water collection surface, the tank lid including a filter positioned to allow passage of water into the storage tank. A roof extension according to claim 14, in which the tank lid includes a base inclined at an angle to the horizontal and wherein the filter is located proximate a lower most region t C. ir of the base.
16. A roof extension according to claim 15, in which the base is convex conical when viewed in plai.
17. A roof extension according to claim 15 or 16, in t which the tank lid has a rim positioned to sit over the top of the endless wall and a cylindrical wall extending downwardly from the rim, wherein the base is fixed to a lowermost end of the cylindrical wall.
18. A roof extension for a sto rage tank having an endless wall, the roof extension substantially as heren described with reference to and as illustrated in any one or more of the accompanying drawings. Dated this 4th day of October 1990. JOHN JOSEPH JONES and LAWRENCE JOHN JONES By Their Patent Attorneys GRIFFITH HACK CO. Fellows Institute of Patent Attorneys of Australia.