* GB784858 (A)

Description: GB784858 (A) ? 1957-10-16

Process for the manufacture of compounds containing phosphorus

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The EPO does not accept any responsibility for the accuracy of data and information originating from other authorities than the EPO; in particular, the EPO does not guarantee that they are complete, up-to-date or fit for specific purposes.

PATENT SPECIFICATION 784,858 Date of Application and filing Complete Specification: April 12, 1954. No 10774/54. Application made In Switzerland on April 13, 1953. Complete Specification Published: Oct 16, 1957, Index at acceptance:-Class 2 ( 3), C( 1 B 7: 3 B). International Classification:-C 07 f. COMPLETE SPECIFICATION Process for the Manufacture of Compounds containing Phosphorus We, CIBA LIMITED, a body corporate organised according to the laws of Switzerland, of Basle, Switzerland, do hereby declare the inventions for which we pray that a patent may be granted to us, and the method by which it is to be perforkmed, to be particularly described in and by the following statement:- This invention provides a process for making organic compounds containing phosphorus of the general formula P, " in which R 1 and R 2 represent aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic residues which may contain substituents, R, and R 4 represent hydrogen, halogen, or a residue R 1, R, represents a divalent bridge member, and N represents 0 or 1 Compounds of this constitution are obtainable by reacting 1 molecular proportion of a

halogen-carboxylic acid halide of the general formula p 5 O a C-/lin which R 3, R,, R,, and N have the meanings given above and Hal stands for a halogen atom with 2 molecular proportions of a Compound of the general formula > O po -AC /a in which R 1 atdlc R,, have the meanings given T Price grid 4 S 6 m above, and Me represents metal. When R 1 or Ra represents an aliphatic residue such residue may have a straight or branched chain, and may be substituted or unsubstituted There may be mentioned, for example, methyl, ethyl, propyl, isopropyl, butyl, hexyl, 2-ethylbutyl, octyl, 2-butyl-octyl, lauryl, octadecyl, or a 2-chlorethyl group; and also radicals containing thiocyanic, cyano or ester groups l The residues, R 1 and R 2 may be identical or different When R 1 or R 2 represents an aromatic radical it may be mononuclear or polynuclear and may contain nuclear substituents There may be mentioned a phenyl, 2 or 4-chlorophenyl, 2:4-dichlorophenyl, 4-nitrophenyl-, 4-, methoxyphenyl, naphthyl or 4-diphenyl group, Among the araliphatic radicals, which R 1 and R 2 may represent, there may be mentioned the benzyl group, and among cycloaliphatic residues the cyclohexyl group, and among heterocyclic residues the tetrahydrofurfuryl group They are salts, for example, of dialkyl esters or diaryl esters of phosphorus acid There are advantageously used alkali salts of the phosphate esters, such as the sodium salts There may be mentioned, for example, the sodium salt of diethylphosphite, of dibutyl phosphite, of diphenyl phosphite or of dibenzyl phosphite. Halogen-carboxylic acid halides suitable for the process are, for example, the chlorides of chlorinated acetic acids, such as ehloracetic or trichloracetic acid chloride When such components are used only one atom of the chlorinated acetic acid enters into reaction. Thus, there is obtained from 1 mol of trichloracetic acid chloride and 2 mols of the sodium salt of diethyl phosphite the condensation prow duct of the formula o 5 O O O/p-C-0-P\ OS l\-2 '111 K W 5 O 2 78485 The condensation in accordance with the invention is carried out by reacting the components together in the relative proportions hereinbefore mentioned They lead to unitary products Some condensation may also occur to give a chloroacyl-dialkylphosphonate as in the examples Owing to the fact that the reaction is often of an exothermic character it may be necessary to bring the components together while cooling and to dilute them with an inert solvent, such as benzene, toluene, ether, dioxane, hexane or low boiling benzine. The reaction is advantageously finished by heating the mixture at about 40-120 C If the reaction components are suitably chosen the condensation products can be distilled under reduced pressure Depending on their constitution the products of the invention are high

boiling oils or solid substances They are useful as intermediate products for a very wide variety of purposes A few of them: are active against animal pests and can therefore be incorporated as active agents in preparations for combating pests. The following Examples illustrate the invention, the parts being -by weight unless otherwise stated and the relationship of parts by weight to parts by volume being the same as that of the kilogram to the litre: EXAMPLE 1. 14 parts of sodium are suspended in 800 parts by volume of anhydrous ether and then 84 parts of diethyl phosphite are introduced dropwise The mixture is allowed to stand for 10 hours at 40 C, then 50 parts of chloracetyl chloride are added while cooling, and the reaction mixture is allowed to stand at room temperature for 3 hours while stirring The precipitated salt is filtered off, the solvent is distilled, and the residue is fractioned Chloracetyl diethyl phosphonate of the formula 0 To 11 \ O Ca H 5 t'o rin, passes over at 108-110 C under 0 1 mm pressure and diethyl-phosphon-acetyl-diethylphosphonate of the formula Cab 5,,0 1 00/0 leq 5 CP ha' ps c 2 tt o o 25 passes over at 128-1290 C under 0 1 tam pressure. EXAMPLE 2. 7 parts of sodium are suspended in 4001 parts by volume of anhydrous ether, and 42 parts of diethyl phosphite are introduced dropwise while stirring The whole is stirred for hours at 40 C, then 27 parts of trichloracetyl chloride are added to the reaction mass, while cooling, the mixture is allowed to stand at room temperature for 6 hours, and the precipitated salt is then filtered oft By evaporating the ether and distilling the residue at 90 C under 0 2 mm pressure there is obtained tri 60 chloracetyl-diethyl-phosphonate of the formula t-e I-e \ v g / Io o e /ts and diethyl phosphon dichloracetyl diethylphosphonate of the formula patt ox, Ilp x e// O o/ a e aster Ca O O \ 10 5 /Ise is obtained at 123-124 C under 0 1 mm pressure.

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* GB784859 (A)

Description: GB784859 (A) ? 1957-10-16

Improvements in electric discharge tube assemblies

Description of GB784859 (A)

PATENT SPECIFICATION I/tcntor:-WILLIAM JOHN DRUICE. D),t,, offiling Complete Specification: March 29,1955. p).A uication Date: April 30, 1954 No 12691154. inplete Specification Published: Oct 16, 1957. Index at Acceptance:-Class 39 ( 1), D( 9 A: 9 B: 9 H: 11: 35). International Clasification: -H O lj. COMPLETE SPECIFICATION. Improvements in Electric Discharge Tube Assemblies. We' lENTELIHARD INDUSTRIES LIMITED, of 52 High Holborn, London, W C 1, England, a British Company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The invention relates to electric discharge or arc tubes of the kind in which a current at high voltage is passed through a sealed tube or burner within a surrounding protective jacket, and is particularly adapted to means for securing to the jacket an endpiece through which the lead-in wires are passed to the burner or arc tube. Known methods of mounting the tube in the outer jacket lacked resilience, with the result that the tube was stressed and often fractured or otherwise damaged The invention has among its objects to avoid this disadvantage, and to provide a simpler and more effective mounting of such tubes. According to the invention an electric discharge tube assembly comprises an electric discharge tube mounted with one end projecting into a cup-shaped ceramic member and connected through said member to a source of current supply, a flat ceramic ring through which the end of the tube extends and by which it is supported, an annular recess in the inner periphery of the cupshaped member at or near the rim, in which recess the ceramic ring is supported at the circumferential edge, a protective jacket which surrounds the discharge tube in spaced relation thereto, and which bears at one end against the rim of the ceramic ring, with packing interposed, and means for holding the

cup-shaped member, the ceramic ring and the end of the protective jacket in pressure-tight engagement. lPrice 3 s 6 d l In a preferred construction according to the invention, the end of the tube is mounted to extend through a circular opening provided in a flat ceramic ring which serves as a vertical closure plate for a cup-shaped ceramic moulding which is formed with a base part through which the lead-in wires are introduced, the base part being of a diameter less than the diameter of the upper part of the cup-shaped member A protective glass jacket for the tube is formed at the circumference to an enlarged crosssection to bear against the outer end face of the ceramic ring at or near the outer edge of the ring and the jacket is held in position by the turned down edge of a steel ring surrounding the upper part of the moulding. A packing strip is provided between the enlarged rim of the jacket and the surfaces of the ceramic ring, the moulding and the steel ring. According to the invention furthermore, the steel ring is clamped around the upper part of the ceramic moulding by means of metal strips welded respectively to the two adjacent ends of the ring, one strip passing through a slot in the other and being folded back over two turned back lugs provided on the slotted strip, whereby the ring is held in close engagement around the ceramic moulding. One free edge of one of the strips may be adapted to be bent into a plane normal to the base of the strip and formed with a slot to serve as a supporting bracket. The ends of the tube which are provided of reduced cross-section are each provided with a cup-shaped metal canister having a central hole which fits around the end of the tube, and at the outer end formed with a laterally extending flange against which rests the vertical ceramic ring which 784,859 784,559 is received in an annular recess formed in the inner surface of that part of greater diameter of the cup-shaped ceramic moulding. The flange of the canister is curled at the circumference to engage the circumferential run of increased cross-section of the glass jacket. The invention is diagrammatically illustrated by way of example in the accompanying drawing which shows a side elevation partly in section of an arc tube assembly according to the invention. Referring to the drawing the ends of the arc tube 1 are formed in known manner to a reduced section and are sealed around the lead-in wires A nickel cup-shaped canister 2 with a central opening fitted over that part of the end of the tube of reduced crosssection to surround with sliding fit the end of the tube proper, is itself supported within a central opening in a ceramic ring 3 which stands in a vertical plane The open end of the canister is formed with an

outwardly directed lateral flange to bear against one 2, side face of the ceramic ring 3 The ceramic ring 3 is seated in an annular recess formed in the inner periphery of the open end of an enclosing cup-shaped ceramic moulding 4. At the open end the moulding is formed to a greater diameter than at the base or closed end, through which the lead-in wires 5, with adequate insulation, are passed. A glass jacket 6 surrounds the arc tube in the usual way, with its circumferential rim 7 formed to a rounded and increased crosssection to be received into the open end of the ceramic moulding 4 and to bear against a side face of the ceramic ring 3, at the circumference, a resilient packing S of any suitable material surrounding the edge of increased section 7 of the glass jacket 6. The ceramic ring 3 and glass jacket 6 are held relatively immovably with respect to the ceramic moulding 4 by means of a steel ring or strip 9 which is turned down at its edges to form annular flanges to fit closely around that part of increased diameter of the ceramic moulding 4 and the rim of increased cross-section of the jacket 6 The ends of the steel ring 9 are held together by inter-engaging metal strips 10 welded respectively to the adjacent ends of the steel ring 9 The free end of one strip is formed as a tongue to pass through a slot 11 provided in an appropriate position in the other strip and is bent back over two lugs formed laterally at opposite positions on the slotted strip and which are bent inwardly The end of the slotted strip is bent upwardly and is formed with a slot opening 12 in one side, to serve as a mounting bracket. Y entilation or lead exit holes 13 may be formed in that part of the moulding 4 of reduced cross-section and also in the ceramic ring 3.

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* GB784860 (A)

Description: GB784860 (A) ? 1957-10-16

Improvements in or relating to detachable pipe couplings

Description of GB784860 (A)

We, EXACTOR LIMITED, a Company organ- ised under the laws of Great Britain, of Church Way, Edgware, Middlesex, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the follow- ing statement:- This invention relates to detachable pipe couplings in which at least one part (the part connected to the supply side) of the coupling is equipped with a self-closing spring-loaded valve which is opened by the other part when the two parts of the coupling are presented to one another: more particularly the invention is concerned with such couplings in which the two parts are formed respectively as a socket and a spigot which can be fitted axially to one another and then turned to bring locking surfaces into cooperation to hold the parts against axial separation: this form of coupling is well known and will be referred to as couplings of the kind referred to. The main object of this invention is to provide an improved form of locking surface which will be smooth in operation and easy to produce. According to the present invention, in a coupling of the kind referred to the socket part has a locking surface formed by a lug extending locally into the cylindrical spigotreceiving bore of the socket and the cylindrical socket-engaging part of the spigot is formed with an eccentric leading end of reduced diameter to enable it to pass into the socket clear of the lug when the spigot and socket are in a predetermined angular relationship, the eccentric leading end having a locking surface formed by a peripheral recess which engages in locking relationship with the lug when the two parts are turned lPrice 3 s 6 d l angularly from the predetermined angular position. When the coupling is intended for relatively high pressure work, the locking surfaces are preferably formed to exert, as the two coupling parts are turned into locking position, a camming action to move the two parts axially into one another and so to open the valve or valves which would, against the pressure acting on them: such valves would as is now customary, be of the axially movable kind. The invention is illustrated in the accompanying drawings in which Figures 1 and 2 are longitudinal sections of the two parts of a coupling disconnected from one another, Figure 3 is a similar view showing the parts coupled together, Figure 4 is an end elevation

looking in the direction of the arrow IV Figure 2, and Figure 5 an elevation looking in the direction of the arrow V in Figure 1. Referring to the drawings, the socket part 1 of a coupling has a pin 2 disposed in its wall 3 so that the pin for part of its length extends as a chord at and across the bore of the socket. The spigot part 4 of the couplings has a cylindrical spigot 5 which is a snug fit in the bore of the socket 3: near its leading end the spigot 5 is formed with a peripheral groove 7 having a cross-sectional shape corresponding to the section of the maximum projection of the pin 2 into the bore of the socket 3 This leading end of the spigot 5 is formed with a reduced diameter portion 6 eccentric to the spigot this reduction extending over the groove 7 so as to leave the reduced end of the spigot with a maximum dimension corresponding to the dimension D between the pin 2 and the opposed wall of the socket 3. Thus, when the spigot 5 is in a certain 784,860 PATENT SPECIFICATION Irtve? O o R:-CECIL NORMAN KING. A l Date of filing Complete Specification: June 3, 1955. Application Date: Allay 12, 1954 No 13957154. Complete Specification Published: Oct 16, 1957. Index at Acceptance:-Class 99 ( 1), G( 4 G: 14 A 1). International Classification:-F 061. COMPLETE SPECIFICATION. Improvements in or relating to Detachable Pipe Couplings. s O 784,860 angular position relative to the socket and the pin 2, it can be moved axially into the socket until the eccentric groove 7 registers axially with the pin By now turning the spigot, the flank walls of the groove pass over the pin 2 so that the spigot and socket become locked axially to one another in such a manner however that the connection can be quickly released. Is 1 The operation of inserting the plug 4 into the socket 1 unseats an automatic self-closing valve arranged in the socket or in the spigot or, as shown, in both depending on the requirements of any particular installation: 13 in the construction shown the valve in the socket 1 is formed by a head 8 of or faced with rubber or some such material, the head having a stem 9 which is slidable in a guide in the bore in the socket; the valve is 2: pressed by a spring 11 to engage a seating formed in a flange 12 extending across the bore of the socket. The valve in the spigot 4 is formed by a slidable sleeve 14 pressed by a spring 15 to 2 ' engage a valve seating 13 on a stemn 17 secured to the spigot When the two parts are presented to one another, the "' fixed" valve seating 13 engages and opens the valve 8 and the sealing flange 12 engages the sleeve 3 component 14 and displaces it from the fixed valve 13, the reaction of the springs 11 and 15 releasably

holding the two parts in coupled position when the spigot part 4 is turned to move the recess 7 over the pin 2. If a self-closing valve were required in only one part of the coupling, which would be the part connected to the supply side, it would be formed in the spigot part 4, the components 8, 9, 10 and 11 not being pro4 O vided in the socket part, which however would retain the flange 12 to co-operate with the sleeve valve 14. For low pressure work, the operator could readily overcome the combined spring and fluid pressure operating to close the valve by applying end pressure when the coupling parts are applied to one another High pressure work requires a greater effort and to facilitate the fitting of the two parts, the eccentric groove 7 could have one of its flank walls formed on a slope to its axis so that, when the parts are fitted and turned, the sloping wall sets up a camming action on the pin 2 and draws the parts together, with a mechanical advantage.

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* GB784861 (A)

Description: GB784861 (A) ? 1957-10-16

Process and mobile apparatus for drying moist grain

Description of GB784861 (A)

PAT-ENT SPECIFICATION I\Q Date of Application and filing Complete Specification: May 26, 1954. No 15533/54. Application made in Germany on June 29, 1953. Complete Specification Published: Oct 16, 1957. Index at acceprance:-Class 34 ( 2), G 1 M(l: 2: 3),124 Gl.

International Classification:-F 26 b. COMPLETE SPECIFICATION Process and Mobile Apparatus for Drying Moist Grain We, RUHRCHEMIE AKTIENGESELLSCHAFT, of Oberhausen-Holten, Germany, a German Company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: - The invention relates to a process and mobile apparatus for drying moist grain and is particularly applicable to the drying of freshly-threshed grain. it is an object of the invention to provide a mobile apparatus for the drying of moist grain which operates effectively irrespective of the inclination of the ground on which it is sited or over which it travels when in use. According to the invention, a process for the drying of moist grain, particularly freshly threshed grain, in a mobile drying apparatus comprises passing the grain downwardly in deep layers over at least one pair of louvred or perforated surfaces provided in a drying chamber of the drying apparatus so that the grain fills a major part of the drying chamber, one of the louvred or perforated surfaces of each pair being in the form of a funnel, heating air or other gas by means of the waste heat and/or motive power of an internal combustion engine, and passing the heated gas upwardly through the grain at such a rate sufficient to eliminate the greater part of the pressure of the grain on the louvred surfaces but insufficient to bring the grain into the suspended state The internal combustion may, for example, be that employed to effect travel of the drying apparatus over the ground and/ or that employed to drive the thresher. According to the invention furthermore, a mobile apparatus for the drying of moist grain, particularly freshly-threshed grain, comprises a chamber provided with at least one pair of louvred or perforated surfaces one of which is in the form of a cone and the other of which is in the form of a funnel, over which surfaces the grain may travel lPrice 3 s 6 d l downwardly under gravity through the chamber, means for utilising the waste heat and/or motive power of an internal combustion engine for heating air or another gas, and 50 means for passing the heated gas upwardly through the chamber at a rate sufficient to eliminate the greater part of the pressure of the grain on the louvred or perforated surfaces 55 The air or other gas, which may be heated by means of the water used for the cooling of the internal combustion engine by passing the water through an appropriately dimensioned air heater If an air-cooled internal 60 combustion engine is involved, the air used for cooling the engine may itself be used for drying the grain It is also possible to use the hot

exhaust gases of the internal combustion engine for heating the air by indirect heat 65 exchange. The quantity of heat supplied by the cooling water, by the cooling air and/or by the exhaust gases of the internal combustion engine required for the movement of the whole 70 apparatus and for moving the air, will generally not be sufficient to dry large amounts of grain It is advantageous, therefore, to use an internal combustion engine which, in addition to moving the portable apparatus, 75 drives an electric current generator The electrical energy produced by the generator is passed to a heater through which the air to be heated is passed. The quantity of heat required in addition 80 to the waste heat of the engine may also be produced by heating devices which are fired by gasoline or diesel oil, that is, by the same fuel as that used for driving the engine The air drawn in by a blower driven by the in 85 ternal combustion engine may be passed through the different heating devices in any order of succession In general, the air drawn in will be first used for cooling the engine or for cooling the engine cooling 9 o water and then for indirectly cooling the exhaust gases The auxiliary heating device, 6,, Able which is operated electrically or in any other manner, is advantageously disposed last in the order of succession of the heating devices, so that the heated gases are blown directly from the auxiliary heating device into the grain drying chamber The amount of additional heat produced electrically or by combustion may be regulated or controlled automatically according to the temperature of the effluent drying gases or to the moisture content of the grain charged or discharged, in order to ensure uniform degree of drying of tile grain. It is generally of advantage to provide A 5 means for adequate cooling of the grain after the drying operation, in order that the dried grain may be bagged or stored without difficulty For this purpose, the portable drying apparatus may be provided with a cooling zone through which the grain may travel downwardly after passage through the drying chamber, the cooling zone being provided with a pair of surfaces similar to those provided in the drying chamber and through which cold air flows The air drawn in by the blower may be divided into two streams, one of which streams is directly blo-vn into the cooling zone of the drying apparatus whilst the other stream is passed through the air heaters Adequate cooling of the grain may be ensured by control means effective to vary the flow-rate or volume of the two streams. It is more advantageous to draw in the cold air into the blow through the layers of grain being cooled in the cooling zone, after which it is blown through the heat exchangers operated by the internal combustion engine and then, adequately heated, through the moist grain in the drying chamber.

The invention is diagrammatically illustrated by way of example in the accompanying drawings, in which several constructions of the apparatus according to the invention are shown in part in vertical section in each case. The apparatus illustrated in Figure 1 comprises a mobile frame 1 which supports a grain drier 2 and an internal combustion enso gine 3 The internal combustion engine drives an electrical generator 4 and a blower The suction or inlet pipe of the blower 5 is connected to the lower section of the apparatus 2 and draws cool air through the two lowermost grid surfaces of the drier The compressed air passes through the water cooler 6 and thence through the waste heat exchanger 7 Then it passes through an electric heating device 8 which is operated by so means of the current generated by the generator 4 The sufficiently heated air passes through an annular space situated below the two uppermost plate grids and thence through the layer of grain travelling down over the uppermost and second plate grids. The air then leaves the grain drier at the top through an opening 9. The moist grain may be charged into the drier 2 by means of a conveyor i 0 while the treated grain is discharged by chute 11 and 70 elevator 12. The apparatus illustrated in Figure 2 utilises the waste heat of the internal combustion engine 13 installed in a tractor The drier 14, a current generator 15 with a blower 75 16, and ani electric heating device 17 are mounted on the portable frame 18 The blower 16, by means of line 19, draws the air through the heat exchangers which utilise the waste heat of the internal combustion engine 80 13 The air preheated in this manner is then forced through the electric heater 17 and then into the grain drier 14 The grain to be treated is fed by means of an elevator 20 and discharged in the dry state by means of 85 chute 21. In Figure 3, the grain drier 22 is mounted on a tractor which can be driven by the internal combustion engine 23 When the tractor is stopped, the internal combustion en 90 gine 23 serves to drive a current generator 24, the energy of which supplies a heater 25 with current By means of the blower 26, cold air is drawn in through the two lowermost plate grids of the apparatus 22 and 95 forced through the heat exchange devices 27 and 28 through which the cooling water of the engine and the exhaust gases flow Thereafter, the air passes through the electric heater 25 and thence into the uppermost see 100 tion of the drier 22. The grain to be treated is fed into the drier 22 by means of an elevator 29 and filled into bags 30 directly below the treating apparatus 105 The device shown in Figure 4 consists of a tractor 31 with a trailer 32 on which the drier 33, a blower 34, an internal

combustion engine 35, and a heating device 38 are mounted The blower 34 draws cold air 110 through the water cooling device 36 and the waste heat exchangers 39 and 40 of the tractor engine The compressed air is passed through the waste heat exchangers 36 and 37 of the internal combustion engine 35 which 1155 drives the current generator Thereafter, the air, which is already extensively heated, passes through the electric heater 38 and thence into the drier 33 provided with two superimposed plate grids 120 The apparatus illustrated in Figure 5 comprises a mobile grain treating apparatus which, for example, may bc moved over the field with a combined harvester and thresher. The internal combustion engine 41 drives the 125 generator 42 and a blower 43 The cool air directly drawn in by the O blower is successively passed through the waste heat exchanger 44, the water cooler 45, the electric heater 46, and thence to the grain drier 47 130 784,861 one pair of louvred or perforated surfaces one of which is in the form of a cone and the other of which is in the form of a funnel, over which surfaces the grain may travel downwardly under gravity through the 70 chamber, means for utilising the waste heat and/or motive power of an internal combustion engine for heating air or another gas, and means for passing the heated gas upwardly through the chamber at a rate suffi 75 cient to eliminate the greater part of the pressure of the grain on the louvred or perforated surfaces.

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* GB784862 (A)

Description: GB784862 (A) ? 1957-10-16

Improvements in flushing cisterns

Description of GB784862 (A)

PATENT SPECIFICATION 784,862; ( l -t Date of Application and filing Complete Specification: May 26, 1955. No 16505/54. Complete Specification Published: Oct 16, 1957. Index at acceptance:-Class 26, H 1 E 2 (F: M: N). International Classification:-E 03 d. COMPLETE SPECIFICATION Improvements in Flushing Cisterns We, HENRY NELSON EWER, of Kingfishers, Lymington, Hampshire, a British subject, and LEONARD SHIBRO, of Birches Barn House, Birches Barn Road, Wolverhampton, a British subject, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to flushing cisterns of the kind comprising a water chamber or cistern provided with a bell adapted to be raised and to operate a siphon whereby the cistern is emptied for flushing purposes, the object of the invention being to provide a simple form of flushinig cistern of this type which can be readily assembled and dismantled, be reliable in operation and in which production costs are kept to a minimum. According to the invention a flushing cistern comprises a water tank having a cylindrical open topped chamber extending from the base thereof, a bell of two diameters to provide a tubular extension projecting upwardly therefrom, the larger diameter of the bell being slidably mounted within said chamber to rise and fall, a siphon pipe projecting into the smaller diameter of the bell and opening below the base of the water tank and within the bell, and co-operating ports in said bell and the walls of the chamber permitting a siphonic action to take place in the lowermost position of said bell, the bell having a downwardly extending internal wall providing an annular chamber forming an air pocket open to the larger diameter portion of the bell to assist the upward movement of the bell when the water tank is emptied. One preferred construction of flushing cistern according to the invention is illustrated in the accompanying drawing wherein the figure is a sectional view of a flushing lPrice 3 s 6 d l cistern showing the position of the parts during the times the cistern is discharging and filling, or is fully charged with water. Referring to the drawing 1 represents the water tank of the flushing cistern, provided 50 with a siphon pipe 2 and a cylindrical open topped chamber 3 provided with radial slots or ports 4, the chamber

having a cylindrical extension 5 below the base of the water tank 1 A nipple 6 is provided 55 for the connection to a flush pipe; the nipple may be formed integrally with the tank or be of separate construction and screwed or moulded into the shell as shown. The bell of the siphon is of two diameters 60 and consists of a tube 7 closed at its outer end and surrounding the siphon pipe 2 in such a manner as to leave an annular space 9 and thus provide the outer leg of the siphonic column The lower part of the siphon bell 10 65 is of the large diameter and has a sliding fit within the chamber 3 of the tank 1 This lower part of the siphon bell 10 is provided with slots or ports 8 which co-operate with the ports 4 in chamber 3 The bell 10 is 70 provided with an upwardly extending annular chamber forming an air pocket 11 open to the larger diameter of the bell which assists in the upward movement of the bell when the water tank 1 is emptied in the 75 usual manner 12 is an actuating lever which is pulled down by the use of a chain or other known mechanism when the flush is to be made and 13 the usual ball float shown diagrammatically for controlling the 80 water inlet valve and 14 a cover to the water tank The air pocket 11 is of suitable dimensions and cross-section. The operation of the apparatus is as follows: 85 The siphon bell comprising the parts 7 and 10 when at rest with a charged tank remains in an upper position being held up by means of a balance weight (not shown); water entering a ball-controlled inlet fills the 90 tank to the indicated water line and flowing through the ports 4 fills the bell portion 7 to the same level but leaves an air pocket 11 in the annular portion of the bell 10 When it is desired to operate the flush, the siphon bell is depressed by the action of the usual handle and convenient mechanism causing the ports 4 to be covered and the water trapped within the siphon bell to be forced upwards through the annular space 9 to fill the siphon pipe 2 When the siphon bell is fully depressed the ports 8 in the portion 10 thereof come opposite the ports 4 and the siphonic action set up by the passage of water in the siphon pipe 2 causes further water to be drawn through the ports until such time as the water level in the tank is lowered to the edge of the ports 4, when air is drawn into the bell and the siphonic action ceases. The siphon bell 7 10 is retained in the lower or flushing position during the action of the flush by the downward pull or reduced internal pressure exerted on it by the siphonic action When the flush is completed, the bell 7 returns to the upper position under the influence of its balance weight, the air pocket 11 assisting the bell to rise. The invention provides a flushing cistern of extreme simplicity, of few parts and easily assembled or dismantled The operation is reliable

and the construction is such as to enable the parts to be manufactured by moulding in resin materials such as polythene Production costs are low and the siphonic parts of the apparatus independent of the bell may be formed in one piece with the tank, so obviating possible leakage.

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