baber/WOPTO huggingface dataset:
Patent GB-964609-A (GB)
Title: Improvements relating to controllable rectifier circuits
Inventor: WALKER ALEC HARVEY BENNETT
IPC: H03K4/84
Filed: 1962-06-26
Abstract: 964,609. Converting. WESTINGHOUSE ELECTRIC CORPORATION. June 26, 1962, No. 24457/62. Heading H2F. [Also in Division H3] In a circuit using a semi-conductor controlled rectifier for generating a sawtooth current in an inductor, and, if desired, an E.H.T. voltage, switching off the rectifier is effected as a result of the sum of oscillatory and non-oscillatory currents through the rectifier passing through zero. At the end of the sweep period the current in the deflection coil L has its maximum negative value and capacitor C 2  is charged positively to a potential about 10 times that of the supply on A.B. A synchronizing signal is supplied to the gate electrode of semi-conductor rectifier CR to render it conducting. The circuit LC 2  now executes a quarter of a cycle of oscillation and oscillation continues until the potential at the upper terminal of the deflection coil L exceeds the supply voltage whereupon the diode D conducts, clamping the voltage across the coil and so ensuring therefore a linear change of deflection current during the sweep period which is now commenced. In the meantime the current in a circuit-comprising CR and a large valued inductor L2-has slowly increased and oscillation in a circuit L1, C1, CR has started. At some time during the sweep the current in the oscillating circuit L1, C1 reverses and when its value exceeds the D.C. current flowing to CR from L2, CR extinguishes and the currents are diverted into C2. At a later time during the sweep the current in the deflection coil reverses whereafter it is maintained by the current through C which together with charge stored in the rectifier is sufficient to also maintain the rectifier conducting so that the linear sweep continues. The current recharges C2 ready for the new fly-back. Oscillation which may occur when the coil currents switch to rectifier D may be eliminated by damping resistors. The circuit components L1, L2 and C1 may be in different series and parallel arrangements (Figs. 2, 3 and 4, not shown), and, by coupling a feed-back coil to L1, the circuit may be made to oscillate (Fig. 6, not shown). A D.C. voltage may be derived from rectifiers connected to windings coupled to L, L1 or L2 (Figs. 5 and 7, not shown), and a capacitor may be connected in series with the winding to cause them to be resonant and thus to draw a harmonic current to assist in preserving a forward current through diode D.
Patent GB-949740-A (GB)
Title: Improvements in or relating to devices for microradiography
IPC: G03B42/02
Filed: 1962-06-26
Abstract: 949,740. Apparatus for microradiography. PHILIPS ELECTRICAL INDUSTRIES Ltd. June 26, 1962 [June 29, 1961], No. 24534/62. Heading H5R. In a device for taking X-ray photographs of a thin layer of material supported on or close to the surface of a film, the support is such that the film and the material are jointly movable relative to the X-ray beam. The device is intended for use in microradiography, and the X-ray tube has a thin beryllium window 5 permeable to soft X-rays. A housing 17 is joined to the wall 2 of the X-ray tube. The film and specimen are supported on the end wall of a carrier 6 housed in a sleeve 9, and held therein by a rubber ring 14. The photographic film is glued on to the end wall 7, and before the ring 14 is fitted, a ring 16 carrying a thin film of the specimen is inserted. This is clamped between carrier 6 and ring 14 by the pressure of a spring 12. Carrier 6 can be rotated by means of a spindle portion 11, which passes through a further sleeve 22 and terminates in a pulley 25 which is belt-driven from a motor 27. Rotation of the film and specimen together obviates spurious interfering contrast effects due to difference of intensity across the beam. The construction also permits ready removal of the carrier 6 from the housing 17 in order to change the specimen and the film.
Patent GB-712082-A (GB)
Title: A method of making balls
Inventor: FISHER HENRY C
IPC: B01J2/12
Filed: 1952-10-01
Abstract: <PICT:0712082/III/1> A method of making balls, useful as catalysts or catalyst carriers, comprises introducing equidimensional solid particles up to 1/10th inch diameter into a container and rotating the container while adding metal, metal oxide, ceramic or glass powder, or a mixture of such powders, and a temporary liquid binder, removing the coated particles and heating them to cause the particles of powder to cohere.  The balls may be porous, hollow, or with cores of different material.  The container 17 is rotated by a variable speed motor 32.  The coating material is fed from a hopper 47, by a member 40 vibrated at a variable amplitude, to a delivery shoot 52 vibrated by air means 94.  Water is supplied through a meter 58 at three points in the container and is atomized by air jets supplied by a pipe 81.  The materials used may be aluminium, antimony, beryllium, cadmium, cobalt, copper, gold, iron, lead, manganese, molybdenum, nickel, palladium, platinum, silver, tin, vanadium, zinc, bronze, brass, metal oxides and alloys, clays, ground glass, zircon, &c.  The nuclei may also be rape-seed, &c.  Porous nickel balls 1/2 in. in diameter are made from white alumina nuclei and 100 mesh carbonyl nickel, dextrine, gum, starch and water.  After coating, the balls may first be heated to 300 DEG  C. or 700 DEG  C., and then placed in a hydrogen atmosphere and heated to 1050 DEG  C. for three hours. Alternatively, the balls are first sintered in hydrogen and then heated to 700 DEG  C. in oxygen to remove the carbon.  The hydrogen may be replaced by helium or nitrogen, the latter resulting in some nickel nitride in the balls.  Again, the nuclei may be initially coated with clay powder and then with the nickel mixture.  Porous, hollow alumina balls are made with dry rape-seed nuclei, the nuclei being coated with liquid resin at intervals during the building-up process.  The sintering takes place at 1750 DEG  C.  Nickel balls may be made from nickel oxide powder of 100 mesh and sintered in hydrogen at 1000 DEG  C.  Iron balls may be made similarly.  A table of sintering temperatures from 140 to 2360 DEG  C. is given.  Sintering may take place in a rotary kiln.
Patent GB-615881-A (GB)
Title: A process and apparatus for hydrating cutting and disintegrating cellulose fibres
IPC: D21B1/12
Filed: 1946-08-20
Abstract: 615,881. Disintegrating paper pulp fibre. LYDDON & CO., Ltd., and NICOL, W. J. Aug. 20, 1946, No. 24786. [Class 96] Paper pulp &c. which may be drawn by a high-speed centrifugal pump E from the trough of a beater is forced through orifices J and impinges on knives adjustably fitted around the orifices J and which converge towards the centre lines of the jets, the jets then impacting against rough surfaces e.g. of vertically adjustable stones, after which the pulp may return to the beater trough.
Patent GB-185643-A (GB)
Title: Improved safety catch lock for attache cases, suit cases, bags, portmanteaux, trunksand the like
IPC: E05B65/52
Filed: 1921-09-19
Abstract: 185,643. Bowen, J. P., and Stanley, E. E. Sept. 19, 1921. Hook fastenings; catches, automatic.-A fastening for attache and like cases comprises an eye on the lid part and a pivoted spring hook on the case part automatically engaging the eye when the case is closed and having a sliding bolt to lock the hook against release. In the form shown in Fig. 1, the hook 5, pivoted at 6, has a bevelled head to engage the eye 1 on closing the lid, and is held in engagement with the eye by the spring 7. A key-operated sliding bolt 8 may be shot into engagement with a recess 11 in the hook member to prevent release, so that the fastening can function even if the spring 7 is broken. A finger-piece 13 is provided for disengaging the hook from the eye. A shoulder 12 on the hook member limits the rocking motion of the hook by engaging the bolt when this is in its withdrawn position.
Patent GB-839325-A (GB)
Title: Improvements in and relating to stator casings for gas turbines
IPC: F01D5/30
Filed: 1956-08-14
Abstract: 839,325. Turbine stator casings. ANSTALT FUR STROMUNGSMASCHINEN G.m.b.H. Aug. 14, 1956 [Aug. 18, 1955], No. 24803/56. Class 110 (3). In a stator casing for a gas turbine, abradable sealing segments of high heat-resisting quality are mounted in either circumferentially closely spaced axially-extending grooves, or in a circumferentially-extending annular groove, formed on the inner surface of the stator casing, the sealing segments being disposed opposite the tips of a row of rotor blades. In Figs. 1 and 2, the stator casing 1 is formed on its inner surface with axially extending undercut recesses 3 in which engage sealing segments 4, the ends of the segments being shaped to correspond with the sides of the recesses 3. The segments are locked against axial movement by means of side plates 6 secured to the casing. The segments surround the tips of rotor blades 2 and are formed of abradable material such as graphite, sintered metal, bronze, copper, plastic with iron filings embedded therein, plastic or ceramic material so that in the event of the blade tips touching the segments in operation, the segments will be worn away by the blade tips so as to restore the clearance. In Fig. 4, the segments are provided with mounting portions 7 which are adapted to engage a circumferential groove formed in the stator casing. The face of the segment is curved convexly in the direction of flow of the working fluid and the surface is also formed with serrations extending transversely to the direction of flow of the turbine working fluid.
Patent GB-1158527-A (GB)
Title: Improvements in Crankpin Grinders
IPC: B24B41/06
Filed: 1967-05-30
Abstract: 1,158,527. Grinding. NEWALL ENG. CO. Ltd., and S. W. HOARE. 8 May, 1968 [30 May, 1967], No. 24885/67. Heading B3D. A grinding machine comprises a pair of workheads for supporting the two ends of a crank-shaft 10 for rotation about a first axis while a set of pins 11 is ground by a wheel or wheels 12, and rotary means for indexing the crank-shaft about a second axis 15 to align a second set of pins with the first axis, the rotary means including a rotatable member 16 which controls the angular position of the crankshaft, the member having a part 44 co-operating with a first pawl 39 to define a first angular position and a part 45 co-operating with a second pawl 40 to define a second angular position. The crank-shaft is supported at each end in a throw block with the axis 11 of one set of pins aligned with the workhead spindle which has an end flange 14. An end plate 17 of the crank-shaft has a hole 18 engaged by a pin 19 on a chuck 20 secured by a spring- loaded collar 23 to the rotatable member which is in the form of a spindle 16 mounted in bearings 26, 27 in the throw block. Rotary movement of the spindle to index the crankshaft is effected by movement of a rack 29 engaging a gear 28 on the spindle, the rack having its opposite ends provided with pistons slidable in cylinders whereby it is movable in one direction or the other. The parts 44, 45 for accurately positioning the sets of crank-pins on the axis 13 consist of notches forming shoulders 46, 47 on the spindle 16, each notch being selectively engageable by a pawl 39, 40. The pawls are mounted on pins 37, 38 and are urged into engagement with the spindle by a spring 144. Each pawl can be lifted from engagement with the spindle by action of a fluid-operated piston 50, 55. When pawl 39, which engages notch 44 to locate one set of crank-pins 11 on the first axis 11, is lifted by piston 15 and piston 55 is connected to exhaust so that the spring 144 engages pawl 40 with the spindle, the spindle and crank-shaft are rotated about the second axis 15 by operation of the rack 29 until pawl 40 engages notch 45 to locate the second set of pins with axis 13. The crank-shaft may have more than two sets of pins, each set comprising one or more pins, the crank-shaft being indexed through angles corresponding to 360 degrees divided by the number of sets of pins. The throw blocks may be provided with a pawl and ratchet for locating the throw blocks in a loading and unloading position in which a surface 72 is horizontal, the surface having a recess 61 in which the crankshaft 60 is received. A pair of jaws 62 each mounted on a respective pivot 63 are connected by arms 64 to pistons 68 in cylinders 69 whereby they are moved in unison to clamp and unclamp the crank-shaft. A motor rotates the workheads at relatively high speed for the grinding operation and relatively low speed for indexing the workheads to the loading and unloading positions.
Patent GB-448371-A (GB)
Title: Improvements in and relating to centrifugally operated electric switches
IPC: H01H35/10
Filed: 1935-09-07
Abstract: 448,371. Centrifugal switches. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London. Sept. 7, 1935, No. 24951. Convention date, Sept. 7, 1934. [Class 38 (v)] A centrifugal switch comprises a metal plate 11 connected bv metal studs 10 to a collector disc 5 mounted on a rotatable shaft 1. An arm 15, mounted on an integral tongue 13 of plate 11, carries on one side a weight 18 and on the other side a contact 16 arranged opposite a contact 9 connected to a second collector disc 4 on shaft 1. A spring 17 is mounted in compression between one end of arm 15 and a button 20 on an arm 14 connected to an integral tongue 12 of plate 11. The pressure of spring 17 is adjustable by a screw 19. The Figure shows the switch at full speed when the centrifugal force of weight 18 has turned arm 15 clockwise against spring 17 to open the circuit at contacts 16, 9. A weight 21 on arm 14 tends to turn the arm clockwise and reduce friction on screw 19. Current is led to the switch by brushes 7, 8.
Patent GB-425175-A (GB)
Title: Improvements in and relating to roof lights, windows and other glass covered structures
IPC: E04D3/06
Filed: 1933-09-09
Abstract: 425,175. Glazing roofs, windows, and the like. JOHNS, J. H., Cornubia Poultry Farm, Wheal Butson, St. Agnes, Cornwall. Sept. 9, 1933, No. 25022. [Class 20 (iii)] The glass sheets of roofs, windows, and the like are overlapped at their meeting edges, the lower edges being supported by clips d secured to grooved members b, Fig. 4, interposed between the sheets, the sides of the panes being supported on grooved runners c carried by the rafters. In vertical structures such as windows, the sheet may be supported by the forwardly sloping surface of the sill bar b<3>, Fig. 6. A slotted bracket h may be provided to hold the sheet in a position for ventilation or the sheet may be supported at its lower edge in one of the slots j<1> of a bracket j or the sheet may be withdrawn and supported at its lower end in a recess y<1> of the sill bar and held at its upper end by a slotted bracket y, Fig. 6. Removable wooden pegs g, Fig. 6, or pivoted stops may be used to prevent removal. The brackets hand the clips d may have fixing spikes formed thereon.
Patent GB-687413-A (GB)
Title: Improvements in or relating to folders for document filing systems
IPC: B42F15/00
Filed: 1949-09-29
Abstract: 687,413. Filing papers. CLARK, E. A. E. Aug. 16, 1950. [Sept. 29, 1949] No. 35074/49. Class 146 (i). A folder, for a suspension filing system in which the folders are secured to bars suspended on rails in a folding cabinet, comprises a back panel 5 having a pocket 8 disposed marginally across one end and a flap 6 foldable against the panel 5 about an edge 7 normal to the pocket edge, the flap 6 being prolonged beyond its junction to the edge 7 and shaped at 12 so as to tuck into the pocket 8, the flap 6 being engageable with the bar 16 to retain the flap closed and the flap also being readily disconnectable from the bar. The folder is made from a single sheet of cardboard or like material folded to form the pocket 8, which is secured by adhesive tape 11 at each end, and the flap 6, the lower part of which is cut away at 13 each side to facilitate entry of the part 12 into the pocket. The top of the flap 6 and panel 5 are each formed into keyhole slots 14 by which the folder is hooked over stamped out hooks 15 on the suspension bar 16 which is formed with a turned over edge 18 to protect the top of the folders and open slots 19 by which the bar slides on rails 20. The side 26 of the flap may be secured by a clip or tapes to the back panel 5 or may be received in a pocket along the side of the panel. A tape may be secured to the panel 5 to tie up the folder for transmission, the whole being folded along the lines 21, 22 and 23, or the bar and folder may be made into a package by folding, the lower edge 10 being pushed into the space between the bar 16' and edge 18. The back panel may be provided with a band for holding documents under the flap or with pins, pegs or the like to receive perforated documents.
Patent GB-1216725-A (GB)
Title: Laser induced acoustic generator
IPC: G10K15/04
Filed: 1968-05-27
Abstract: 1,216,725. Lasers. UNITED AIRCRAFT CORP. 27 May, 1968 [1 June, 1967], No. 25181/68. Heading H1C. Pulses of sound are produced by irradiating an acoustic transmitting medium with pulses from a mode-locked laser. The laser active medium may be Nd glass, ruby, or NdYAG placed in cavity 12, 12<SP>1</SP> and mode locked by a dye cell or acoustic waves to produce a train of uniformly spaced optical pulses. The pulse train is directed on to a thin film 14 of gold, tin, copper, silver or semi-conductor or crystalline non-metallic film bonded or deposited on an acoustic transmitting medium such as LiNbO 3 , glass, quartz or sapphire. Thermal stressing caused by the partial absorption of the laser pulse train by the film propagates short discrete acoustic pulses into the crytalline bar. The acoustic pulses generated in crystal 16 may be fed to an output device by electrical transducer CdS 18. If quartz and LiNbO 3  are used a separate output transducer is not required. The film 14 may be sandwiched between two crystals. A liquid cell may be used instead of a crystal. For lower frequency acoustic pulse generation, the thin film may be omitted and materials such as stainless steel, nickel and germanium used The acoustic frequencies are varied by adjusting the laser cavity length since the acoustic waves are strictly confined to the harmonic frequencies of the laser pulse repetition frequency.
Patent GB-644490-A (GB)
Title: Gas turbine heating plant
IPC: F02C6/18
Filed: 1948-09-27
Abstract: 644,490. Gas turbine plant. MASCHINENFABRIK OERLIKON. Sept. 27, 1948, No. 25201. Convention date, Oct. 25, 1947. [Class 110(i) and 110(iii)] In a gas turbine plant which supplies useful power and also hot water to a heating system, the water is progressively heated in an interstage cooler 9, Fig. 1, between low-pressure and high-pressure compressors 1 and 2. in inter-stage coolers 10, 11, 12 in the compressor 2 and in an exhaust gas heat-exchanger 13. The heat given up to the water is reduced by byepassing one or more of the interstage coolers. It is increased by sending the turbine exhaust direct, through pipe 14, to the exchanger 13 and, at times, by burning fuel in that exhaust. When the turbine plant is not working the exchanger 13 can be separately fired. The turbine may be in two stages 6, 4, with reheating at 8, and the exhaust goes through the air heater 3. The compressors are multi-stage centrifugal compressors. Each stage is connected to the next by several volute and diffuser ducts a<SP>1</SP>, Fig. 2. In the high-pressure compressor these ducts include built-in interstage coolers a. Specification 558,910 is referred to.
Patent GB-278696-A (GB)
Title: Improvement in prevention of livering in pigmented carbohydrate-compound compositions
IPC: C09D101/18
Filed: 1927-09-26
Abstract: 278,696. Du Pont de Nemours & Co., E. I., (Assignees of McBurney, J. D., and Nollau, E. H.). Oct. 5, 1926, [Convention date]. Coating-compositions; preventing thickening in paints.-The livering or gelling of carbohydratecompound coating compositions is prevented or overcome by small additions (0.1-5 per cent) of substances adapted to restore or maintain the sol condition. Such substances are those having a hydrogen in dissociation constant (Pka) between 1.0 and 4.7 but preferably greater than 2.0. Examples are oxalic, phosphoric, tartaric, citric, malic, and formic acids. They may be either mixed first with the pigment or added to the complete composition, and in the latter case a solvent for the base metal may also be added. The invention is particularly applicable to compositions comprising cellulose esters or ethers and metallic powders, but it extends also to compositions containing other pigments and other carbohydratecompound bases, such as starch acetate.
Patent GB-887506-A (GB)
Title: Improvements in the heat treatment of metals by plasma heating
IPC: C21D1/09
Filed: 1959-07-27
Abstract: 887,506. Surface hardening. PLASMA FLAME CORPORATION. July 27, 1959 [Sept. 18, 1958], No. 25649/59. Class 72. [Also in Group XI] A process of surface hardening steel comprises directing a free plasma stream into contact with the steel and then quenching. As shown, a free plasma stream may be produced by passing a gas, e.g. nitrogen, from a connection 37 through a tube 38 to distributing passages 39 into a space 36. The gas then passes between an electrode 28, of frusto-conical shape, and a nozzle 32 of platinum, silver or copper. An arc is struck between the electrodes and the nozzle and the gas is converted into a free plasma, and, by varying the gas flow the position of the arc in the nozzle may be adjusted. The free plasma is directed against the steel to be heated and, since the plasma may have a temperature of about 16,500‹F. heating is very rapid. The heated piece is then quenched and a hardened surface less than <SP>3</SP>/ 32  inch thick may be produced. The apparatus may be water-cooled, the water being introduced through the electric supply cables. Specification 863,189, is referred to.
Patent GB-244562-A (GB)
Title: Method of treating fibrous vegetable waste and product manufactured thereby
IPC: C08L97/02
Filed: 1924-10-28
Abstract: 244,562. Naylor, I. Oct. 28, 1924. Plastic compositions containing fibres and soluble silicates.-Waste vegetable matter is finely ground and soaked in a solution of sodium silicate of about 20<@> Be. The soaked mass is treated with dry steam until the solution has a strength of about 40‹ BÚ and the composition is of a thick muddy consistency. This is mixed with one-third of its weight of sodium silicate solution of 40‹ Be strength, and the mixing is continued until a coherent mass results. Articles such as kegs, crates, floor boards are formed from this mass and are then subjected to a current of hot air and carbonic acid gas to decompose the silicate and compact and dry the article. After drying, the article is passed through baths of sodium silicate solution and sodium bicarbonate solution to produce an impervious surface.
Patent GB-320330-A (GB)
Title: Improvements in or relating to the braking of electric winches or the like lifting and lowering apparatus
IPC: B66C13/24
Filed: 1928-07-04
Abstract: 320,330. Scott, W. H., Scott, G. J., and Wheeler, H. D. July 4, 1928. Divided on 319,429. Regenerative systems; electric braking.-For operating winches or other lifting and lowering apparatus, an electric motor C fed by a motorgenerator set A, B has a series connection to a winding 17 which together with a winding 18 connected across the mains controls the action of a magnetic brake, the two windings being arranged so that they oppose each other when the motor is regenerating and thus permit the brake to be partly applied. The windings assist each other while the motor is raising the load and thus take off the brake. In the arrangement shown in the Figure the invention is associated with a control system of the kind described in Specification 319,429, and employs a magnetic brake of the spring-applied disc type as described in Specification 232,063, [Class 103 (i), Brakes &c.].