baber/WOPTO huggingface dataset:
Patent GB-1455985-A (GB)
Title: Direct current chopper arrangements
IPC: H02P7/29
Filed: 1975-05-19
Abstract: 1455985 Control of D.C. motors SIEMENS AG 19 May 1975 [20 May 1974] 21326/75 Heading H2J A D.C. chopper arrangement for feeding energy between a source of direct-voltage 2 and a load 5, e.g. a motor, comprises a sequential connection of a primary winding 19 of a transformer 18 and a controllable rectifier element 6 having an oppositely poled swing-back rectifier element 13 connected across it, a sequential connection of a secondary winding 20 of the transformer and a blocking rectifier 21 connected across the source, a commutating capacitor 9 chargeable by the source, a second controllable rectifier element 11 poled in the direction of the first, and a freewheel rectifier element 15 poled in the other direction. Chokes 7, 8, 12, 14, 16 and 17 and a resistor 10 are also provided. With the above described construction, the load current I m  can flow in both directions between the source 2 and motor 5, i.e. the motor 5 may be driven from the source or may act as a generator for braking. The extinction of one current-carrying thyristor 6 or 11 takes place in each instance by firing of the other rectifier element 11 or 6, the commutating capacitor 9 swinging over through the two rectifier elements 6, 11, while the initially current-carrying rectifier element 6 or 11 is extinguished at the swing- back. During this commutation operation the intermediate circuit voltage U d  is made equal to zero so that the voltage U o  is directly present at the primary winding 19. At the end of the commutation operation the charge of capacitor 9 is at the initial polarity. Owing to the further charging of capacitor 9 from the source 2, a current flows through the secondary winding 20 so that the voltage at the primary winding does not reach an inadmissably high value as the charging current decreases.
Patent GB-323500-A (GB)
Title: Process for the preparation of effect threads
IPC: D06P1/651
Filed: 1928-07-24
Abstract: 323,500. Chemische Fabrik vorm. Sandoz. July 24, 1928. Addition to 280,493. Fibres, treating; yarns &c., treating with liquids. -The process of the parent Specification for modifying the properties of cotton and other vegetable fibres, yarns, &c. by treatment with an acetylation bath so as to produce cellulose mono- or di-acetate, is carried out at temperatures higher than 25‹ C., the activity of the bath being reduced as by the use of a smaller proportion of catalyst or by the employment of a weaker catalyst. The temperature may be so far increased as to permit the reaction to be performed in say 12, 10 or even 1-¥ hours. It is important that the acetylation mixture should be kept in movement in order to ensure uniform action.
Patent GB-1253782-A (GB)
Title: Adjustable lamellar sieve, more particularly for combine harvesters
IPC: A01F12/44
Filed: 1970-05-05
Abstract: 1,253,782. Adjustable sieve. MASCHINENFABRIK FAHR. AG. 5 May, 1970 [7 May, 1969], No. 21566/70. Heading A1F. A sieve suitable for dressing in a combine harvester having rectangular groups of angularly adjustable horizontal lamellae, each group being individually adjustable with respect to the other groups comprises a sieve frame 1 and groups of horizontal lamellae 2, 2' mounted on axles 3, the lamellae of each group being parallel, the common pitch of which is adjustable with respect to the air flow coming from underneath by means of downward depending coils 4, 4' and horizontal bars 5, 10, and fixed by the engagement of the notched portions 8 of rods 5, 10 with adjusting members 7, 7'.
Patent GB-1357479-A (GB)
Title: Ball projector device
IPC: A63B69/40
Filed: 1972-05-09
Abstract: 1357479 Ball projecting device K STOLL 9 May 1972 [10 July 1971] 21587/72 Heading A6D A device for projecting balls, e.g. tennis balls for practising return strokes, includes a container 20 for storing balls, and a feed device 21, 24 for delivering one ball at a time to a position 2 in a projector cylinder 1 from which the ball is projected by compressed air controlled by a valve 5. As shown, one end of the projector cylinder 1 comprises a pressure chamber 3 communicating with the valve 5, which opens in response to a timer mechanism 11, and a store 6. The store 6 is fed with compressed air from a container (8) (Fig. 2, not shown) which is supplied by a pair of compressors (9, 10). A motor driven paddle 22 in the container 20 ensures that a feed pipe 21 is always full of balls. The projector cylinder I comprises an inner, slidable cylinder 24 which closes an aperture 25 in an outer cylinder 23 during projection of a ball but which is momentarily advanced by pneumatic controls means (not shown) to a position 27 just long enough to allow the next ball 2a to fall through the aperture 25 to the projection position. The cylinder 24 is retracted and the valve 5 opens to eject the ball A sound muffler 12 may be provided. The projector cylinder I is pivotable about vertical and horizontal axes and adjustable in height on telescopic tubes 13a, 13b to obtain a desired ball trajectory.
Patent GB-1404822-A (GB)
Title: Foamed polymers
IPC: C08G18/42
Filed: 1972-05-09
Abstract: 1404822 Rigid polyisocyanurate foams IMPERIAL CHEMICAL INDUSTRIES Ltd 4 May 1973 [9 May 1972] 21592/72 Heading C3R Rigid polyisocyanurate foams are prepared by admixing a polyesterification product having an OH number of 200 to 700 and not more than 1À5 branch points for each 1000 units of molecular weight, a blowing agent, a catalyst for the trimerisation of isocyanates, an intumescing agent which is an organic or inorganic solid material capable of expanding to at least 3 times its unexpanded volume when heated to at least 150‹ C., and a crude diisocyanatodiarylalkane composition containing from 5 to 70% by weight of polyaryl polyalkylene polyisocyanates of functionality greater than two, the composition being present to provide 3 to .10 equivalents of isocyanate groups for each equivalent of active hydrogen. Intumescing agents used in the examples are expandable graphite flake, powdered vermiculite which has been predried, 4-nitroaniline-2-sulphonic acid ammonium salt and sucrose. The other components of the reaction mixture correspond to those used in the invention of Specification 1,223,415.
Patent GB-365581-A (GB)
Title: Improvements relating to speed gear for power vehicles
IPC: F16H3/16
Filed: 1930-07-17
Abstract: 365,581. Change-speed gearing. KITTILSEN, K., Lille Traag, near Porsgrund, Norway. July 17, 1930, No. 21655. Convention date, Jan. 23. Void [Published under Sect. 91 of the Acts]. [Class 80 (ii).] Change-speed gearing on a vehicle comprises a two-speed bevel gear unit A at the rear axle and a two-speed and reversing gear unit B between that and the engine. Bevel-wheels b, bl of the unit A loose on the axle p mesh constantly with pinions a, a<1> fast on propeller shaft q. Clutch members c, c<1> splined on the axle are movable together by a striker n to engage either of two clutch faces on the gears b, b<1>, respectively. Thus the axle receives two so-called " direct drives from the shaft q. The unit B may be of the countershaft type shown in which a gear d slides on the shaft q and has a clutch face e to engage the end of a pinion f on the power shaft r for direct highspeed drive. For low speed, the gear d is brought into mesh with a gear (not shown) on a constantly-driven countershaft s. Reversal is effected when the gear d is meshed with a reversing idler h. It is stated that the units A and B may be operated by mutuallyperpendicular movements of a single control lever indicated at i. An alternative construction for the gear unit B is indicated comprising stepped planet gears and a plate clutch.
Patent GB-641104-A (GB)
Title: Improvements in or relating to turbine stage, particularly for gas turbines
IPC: F01D25/30
Filed: 1947-08-07
Abstract: 641,104. Gas turbines. BUCHI, A. Aug. 7, 1947, No. 21685. Convention date, Aug. 13, 1946. [Class 110(iii)] Working fluid enters through three pipes 6 into three tangentially arranged chambers 15 located radially outward of the turbine. The flow in these chambers is in a direction opposite to that of the rotation of the turbine. It is guided to the blading by substantially flat vanes 4 between steeply inclined and slightly curved walls. The flow through the rotor blading 2 is inclined towards the turbine axis and the turbine is followed by a diffuser 9 defined by two divergent conical walls 12, 14 and divided into three parts by cross-walls 13. A further diffuser 10 similarly divided turns the flow to an outlet 11 or may continue it in an axial direction as shown at 11'. The vanes 4 may be extended outwardly to bring the inlet edges into the radial plane containing the outlet edges. An axially directed diffuser 11<SP>1</SP> may have an inner wall provided by a part which is axially adjustable to vary the value of the diffusers.
Patent GB-375589-A (GB)
Title: Improvements in television scanning systems
IPC: H04N3/04
Filed: 1931-07-29
Abstract: 375,589. Television. CAWLEY, A. J., 17, South Main Street, Pittston, Pennsylvania, U.S.A. July 29, 1931, No. 21696. Convention date, Aug. 7, 1930. [Class 40 (iii).] A single moving element A, Fig. 3, is used in a scanning system in which a scanning-spot i is produced by the intersection of two slots or the like a, b, c, d. Light from a source 3, which at the receiver is a neon tube or arc light modulated by the signals, is concentrated to a parallel beam by a lens 4, reflected by a prism 2a, and passed through a slot or cylindrical lens a, b in a cylinder C on the rotating disc A. The light is reflected back by a reversing prism 2 to produce an image a<3>, b<3> of the first slot on a second slot c, d to produce a scanning-spot i. The vertical movement of the spot is produced by progressive variation in the spacing of the slots in the cylinder. The light passes through a second cylinder C<1> on the disc bearing either masking-areas u or chopping-lines. The slots may be in an endless band, Fig. 2 (not shown), or in a disc with light passed through adjacent, Fig. 4 (not shown) or opposite slots, Fig 6 (not shown), or partly in a disc and partly in a cylinder carried by the disc, Fig. 7 (not shown). As shown in Fig. 8, the slots may be in a plurality of sets, the light being reflected from one to the other. In this case the slot c, d, travels faster than the slot c, d and progressive difference in spacing is unnecessary. The prisms 2, 2a are mounted on a shelf on the hinged door of a cabinet containing the scanning-apparatus, Figs. 9 and 10 (not shown). As shown in Fig. 14, light from a source 3 passes through a helical aperture or cylindrical lens 9 in the cylinder C, and is reflected by a reversing prism 2 to pass through slots a, b. The helical aperture may be replaced by a spiral neon tube, actuated in sections by a commutator. A second lamp 3a co-operates with a second helical aperture. The lamps 3, 3a may be operated simultaneously or successively by a commutator s, k. The helical apertures may be in the disc A, Figs. 11 and 14a (not shown).
Patent GB-907562-A (GB)
Title: Improvements in or relating to engines
Inventor: HOOKER STANLEY GEORGE
IPC: F01D21/04
Filed: 1958-07-07
Abstract: 907,562. Machinery guards. BRISTOL SIDDELEY ENGINES Ltd. July 7, 1959 [July 7, 1958], No. 21735/58. Class 80 (4). [Also in Group XXVI] A gas turbine engine comprises a casing, at least one rotor within the casing, the rotor having blades mounted at its periphery, and a substantially tubular shield enclosing the casing and the rotor, the shield being radially spaced from and resiliently carried by the casing. The engine shown in Fig. 1 comprises a casing 10 in which are disposed two rows of rotor blades 11 and an intermediate row of stator blades 12. A tubular shield 13 surrounds the turbine casing and is resiliently supported thereon by means of two series of angularly-spaced bent steel fingers 14, 15. The fingers 14 are bolted to the flanges 16 of the casing at their inner ends and to the shield 13 at their outer ends. The fingers 15 are bolted to projections 17 formed on the casing at their inner ends and to the shield at their outer ends. The shield is made of material which does not shatter on impact, for example glass-fibre reinforced resin. An inner lining 18 of heat-resisting material for example aluminium foil is provided within the shield to protect the resin from the heat. Means are provided to cause a flow of air through the space between the casing and the shield and comprises a Venturi tube 32 and a tube 31 leading from a pressure source of the engine to the throat of the Venturi. Alternatively an inducer nozzle as indicated by chain-dotted lines may be secured to the shield by a flexible connection 33, the gases from the turbine being discharged through a jet propulsion nozzle and inducing a flow of air through the space between the turbine casing and the shield. In a second embodiment (Fig. 2) the shield 13 is in two parts 19, 20 the flanges 23 of which are connected together. The shield is resiliently supported from the turbine casing 10 by means of a series of triangular-shaped steel plates 21, one corner of each plate being connected to the flanges 22 of the turbine casing and the other two corners of each plate being connected to the flanges 23 of the shield. A pipe such as a fuel drain pipe may be led between the casing 10 and the shield 13. Instead of lining the shield with heat-resisting material 18, a radiation sleeve 34 of heatresisting material may be disposed between the casing and the shield. The sleeve may be supported from the casing 10 by means of flexible steel fingers 35, or from the shield by means of fingers 36. The shield could be shaped so as to conform more closely to the shape of the casing. The invention is applicable not only to gas turbine engines but to any engine having a casing and parts within the casing which move at speed during operation which if they became detached might be projected through the casing. The shield may be resiliently mounted on structure adjacent the engine casing instead of being mounted on the casing itself.
Patent GB-1373577-A (GB)
Title: Electrolytic production of metal bands
IPC: C25D1/04
Filed: 1972-05-10
Abstract: 1373577 Electrolytic production of metal bands GOSUDARSTVENNY NAUCHNOISSLEDOVATELSKY INSTITUT TSVETNYKH METALLOV "GINTSVETMET" 10 May 1972 21748/72 Heading C7B A metal band 7 (e.g. of Cu) is electrolytically produced using apparatus comprising a rotating drum cathode 2 (e.g. of Ti) having anode plates 3, 4, 5, 6 mounted therearound, means 10 supplying air for agitating the electrolyte and an elastic partition member 21 which slidingly engages the drum and prevents electrolyte agitation in the region of the last anode 6. The current densities used are as indicated:-1,000 to 5,000 A/sq m in the region of the anodes 3 and 4, for formation of the metal band; 5,000 to 10,000 A/sq m in the region of the anode 5 for 1 to 300 sec to ensure roughness of the band; and 4,000 to 50,000 A/sq m in the region of the anode 6 for 1 to 200 secs to ensure formation of microscopic roughness of the band's outer surface. The ratio of the surface areas of the anode plates 5 and 6 may be 15:1 to 5:1. As shown, the apparatus comprises a Ti housing consisting of two semicylinders pivoted at 18 and pivotable by actuators 19; electrolyte inlet manifolds 11; overflow pockets 12; exhaust ventilation pipe 13 and guiding roller 22 for the electro-formed band 7. Fig.2 (not shown) illustrates how deposition on the end of the drum cathode is prevented. End covers (16) for the cylindrical housing 1 are secured thereto by annular diaphragms (17) and are spring-pressed against the ends of the drum. Current is supplied to the drum by brush contacts (20). Specified conditions are an H 2 SO 4 -CuSo 4  electrolyte, soluble or insoluble anodes and a Cu band thickness of 10 to 110 microns.
Patent GB-1187207-A (GB)
Title: Improvements in and relating to Agricultural Mowers
Inventor: TEAGLE WILLIAM THOMAS
IPC: A01D34/63
Filed: 1966-04-13
Abstract: 1,187,207. Rotary mowers; hitches. W. T. TEAGLE. 19 May, 1967 [13 April, 1966; 17 May, 1966], Nos. 16213/66 and 21895/66. Headings A1F and A1P. A rotary mower comprises a wheeled frame 1-4 in which is rotatably mounted a vertical shaft (42) having at its lower end a plurality of radially extending cutting blades 49 and being driven by means of pulleys 55, 58 operatively connected by V-belts 57 twisted intermediate their length, the pulley 58 being secured to a horizontal shaft 60 drivingly connected to the power take-off shaft of a tractor and the frame being provided with means for detachably securing it to the lift linkage of the tractor so that the cutting blades are offset to one side of the path of the tractor. The frame has a first pair of hitching pins 30 for attachment to the lower lift links of the tractor when the mower is in its operative position, and a second pair of pins 33 for attachment to the lift links so that the mower is behind the tractor for transport purposes. The frame has an offside wheel 7 to the axle 9 of which is attached a threaded rod 12 by means of which the wheel 7 can be raised for transport purposes. The nearside wheel 8 is adjustably mounted on a pivoted bracket 18 which is adapted to be mounted on the frame member 4 in the operative position of the mower and on the frame member 1 for transport purposes. A jack 69 is provided to support the frame when the wheel 8 is being changed over. A swath board 67 pivotable about a vertical axis 68 is provided adjacent wheel 8. The cutting blades 49 are enclosed in a housing having a pivoted flap 65 at its forward end to control air circulation in the housing and the rear end 40 is arranged to open to enable cut material to be deposited directly behind the mower. Additional cutting blades may be provided above blades 49, these blades being reversible to present either a sharp edge for cutting or a rounded edge for crimping. In a modification the frame is in two sections, a first section being attachable to the lift linkage and the second section supporting the cutting apparatus and being pivotable on a longitudinal member of the first section for movement, effected by means of a hydraulic ram, between a horizontal working position and a raised transport position.
Patent GB-1154769-A (GB)
Title: Security System
IPC: G08B13/181
Filed: 1967-05-11
Abstract: 1,154,769. Intruder alarms. TYCO LABORATORIES Inc. 11 May, 1967 [12 May, 1966], No. 21900/67. Heading G4N. A system for detecting an intruder within an area under surveillance comprises a source of X- or γ-radiation disposed substantially continuously along the perimeter of the area and a plurality of detectors disposed within said area. As shown in Fig. 4, a γ-ray source 40 may take the form of a wire of Am 241 or Cs 137 or a tube containing Kr 85. The source may be laid on the ground, buried or incorporated into a fence. A further continuous source 43 and detectors 41 such as gas or solid state ion chambers, proportional counters, geiger tubes or liquid or solid scintillators are included. The presence of an intruder within the zone bounded by the circle 40 will produce the output from one or more detectors 41 and initiate an alarm. An intruder within the zone bounded by the circle 43 will provide a much greater change in output from detectors 41. Each detector such as 15, Fig. 5, is coupled to amplifiers 16, 17 the output of which leads a pulse amplitude discriminator 18, feeding an integrator 23 and a meter 24 feeding a bell or light alarm 25. The outputs of other detectors are similarly fed to other integrators 23 coupled to meters 24 whilst a further meter 28 provides an indication for the entire surveillance zone. A reference unit 27 includes a detector shielded from radiation and provides a reference level for temperature and noise compensation. In Fig. 3 (not shown) the continuous source 43 is omitted and a point source is included at the centre of the circle. The continuous γ-ray source may be replaced by a plurality of X-ray sources.
Patent GB-365986-A (GB)
Title: Improvements in or relating to boots, shoes and similar footwear
IPC: A43B13/04
Filed: 1931-07-31
Abstract: 365,986. Boots &c. JACKSON, L. MELLERSH-, 28, Southampton Buildings, London.-(Naamlooze Vennootschap Holland Rubber Fabriek Radium; Maastricht, Holland.) July 31, 1931, No. 21916. [Class 17 (ii).] A shoe sole is formed in one piece by moulding plastic material and comprises a long sole having a raised heel B, an upstanding peripheral portion C extending around the forepart A, the heelpart A<2>, and along one side of the shank A<1>, formed with indentations C<1> to simulate a welt, projections E formed on the upper surface of the forepart A, and a plurality of recesses F formed in the heelpart A<2>. The sole is secured to a shoe by adhesive, sewing, or nailing, &c.
Patent GB-1109294-A (GB)
Title: Process for the manufacture of an electrophotographic material
IPC: G03G5/05
Filed: 1965-05-25
Abstract: Particles of photoconductors are coated with a continuous layer of resin having an electrical specific resistance above 1013 Ohm. cm. The photoconductor is preferably ZnO but may also be, for example, an oxide of antimony, aluminium, bismuth, cadmium, mercury, molybdenum or lead.  The resin may be a hydrophobic resin.  Specified are silicone resins, polymers of styrene, vinyl esters, preferably vinyl butyral, vinyl acetate and vinyl chloride, with which, if desired, a small proportion of a carboxylic acid, for example acrylic or maleic acid, may have been polymerized.  The coating is supplied by mixing the particles with a solution of the resin, filtering and drying the residue.ALSO:A process for the manufacture of an electrophotographic material by coating a support with a resin layer containing particles of a photo-conductor and solidifying the said resin layer, comprising the particles of photoconductor are first coated with a continuous layer of a resin having an electrical specific resistance above 1013 Ohm. cm. and then making a preparation from the photoconductor thus pretreated and a resin acting as a binder in an aqueous medium that does not dissolve the resin coating of the photoconductor, and then applying the aqueous preparation to a support.  The resin having a specific resistance above 1013 Ohm. cm. may be a hydrophobic resin. Examples are polymers of styrene, vinyl esters, preferably vinyl acetate and vinyl chloride with which, if desired, a small proportion of a carboxylic acid, for example acrylic or maleic acid may have been copolymerized.  Such polymers can be dissolved, for example, in acetone.  Silicone resins which are soluble in toluene are also specified.  The binder may be a resin that contains carboxylic acid groups.  These polymers should be of a nature such that they are soluble in water at least in the form of their alkali metal or ammonium salts.  Suitable polymerizable carboxylic acids are crotonic, methacrylic, chloracylic, acrylic and maleic acids which may be co-polymerised with for example acrylic acid esters, vinyl esters of lower carboxylic acids, e.g. vinyl acetate, and vinyl chloride or styrene.  Photoconductors specified are the oxides of antimony, aluminium, bismuth, cadmium, mercury, molybdenum, lead and zinc.  The photoconductor particles have a size of preferably below 1u. 0.1% to 5%, based on the weight of the photoconductor, of the following elements or a compound thereof may be added singly or in an admixture with each other; boron, thallium, lithanium, lead, cobalt or silver.  When a water-soluble resin is used as a binder, there may be added to the preparation substances which on being heated render the resin water-insoluble by forming insoluble polyamides.  Such substances are compounds of hexavalent chromium, for example ammonium bichromate and amines which are non-volatile at temperatures up to 120 DEG C. containing at least two reactive amino groups.  The support may be of paper and may be coated on both sides.