baber/WOPTO huggingface dataset:
Patent GB-1272217-A (GB)
Title: Electric motor control system
Inventor: PLANT ANTHONY BRIAN
IPC: H02P23/00
Filed: 1968-05-30
Abstract: 1,272,217. Control of A.C. motors. JOSEPH LUCAS (INDUSTRIES) LTD. 18 Aug., 1969 [30 May, 1968], No. 25876/68. Heading H2J. An induction motor 10 -is supplied through SCR circuits 11 or 12, the speed of the motor being determined by the magnitude of an input signal at terminal 13, and the direction of drive being selected in accordance with the polarity of the input signal. The amplified signal is applied to a firing circuit 15 and a polarity detection circuit 16. The firing circuit comprises a capacitor 18 which is charged in accordance with the magnitude of the output of amplifier 14, irrespective of the polarity of the output, the -capacitor being discharged at the end of each half cycle of the supply. The amplifier 14 inverts the signal at terminal 13, transistor 20 responding to a positive output so that capacitor 18 is charged through resistor 22. When the amplifier 14 has a negative output, transistor 21 controls transistor 23, 27 so that the charging rate of capacitor 18 depends on the 'current through transistor 23 and resistor 25. Variation of the rate of charge of capacitor 18 varies the instant at which the voltage at point A becomes sufficient to operate trigger circuit 29. The pulses produced by a shaping circuit 30 are initiated by the leading edges of the pulses from the circuit 29 so that those gated to the trigger circuits 39, 40, have a firing angle which depends on the magnitude of the output of amplifier 14. The polarity detection circuit 16 comprises switching unit 31 which produces an output in response to input signals of one polarity only, a logic circuit 32 supplying a signal to either one of the trigger circuits 39, 40, in accordance with the output of the unit 31. The logic circuit comprises NOR gates 33, 34, each receiving a pulse train from the circuit 30. The gate 33 receives an input from unit 31, whilst gate 34 receives an input from gate 33. The outputs of gates 33, 34, are applied to bistable element 35 whereby the voltage levels at points H, J, reciprocate in response to the potential at point C. The change of state of the voltages at points H, J, is delayed in accordance with the interval between pulses at point D whereby simultaneous firing of the sets 11, 12 is prevented.
Patent GB-506316-A (GB)
Title: Improvements in and relating to portable electrical welding machines
IPC: B23K11/31
Filed: 1938-09-05
Abstract: 506,316. Electric welding. BRIGGS MOTOR BODIES, Ltd., McINTOSH, J. E., and UREN, H. Sept. 5, 1938, No. 25926. [Class 83 (iv)] A portable electric seam welding machine for producing a continuous weld or a series of closely spaced or overlapping spot welds, e.g. in the curved surfaces of motor car panels and wings, consists of at least two roller electrodes one of which is displaceable into and out of work-engaging position, switch means being provided in the machine for controlling the movement of the displaceable electrode and for controlling the supply of welding current to the electrodes. A frame 1 provided with a handle 18 carries the spindle 3 of a roller electrode 6, which is driven by a motor through a flexible shaft 9, reducing gear and worm gear 8, 7. To the frame is pivoted at 11 an insulated lever 10 carrying a similarly mounted roller electrode 13, the lever 10 being displaced by a fluid operated spring-returned piston 23 through a connecting rod 24 and link 25. A light spring 28 is placed between a collar 26 on the rod and the inner sleeve 27 of the piston to prevent any hammering action due to sudden entry of compressed air. Compressed air is supplied from a supply line 46a through a combined piston valve 32 and electric contact 43 adjacent to the handle 18 and operated by a spring-returned push button 35 of fibre or other insulating material. The piston 32 has a hollow stem 33 through which extends a rod 34 secured to the push button at one end and surrounded by an insulating sleeve 36 and fibre ring 37. One end of the rod secures a porcelain liner 36a and flanged cage 40 engaging the collar 42 on the contact member 43. When the button 35 is pressed, fluid pressure passes, to the cylinder 19 through a port 46, groove 32a in valve 32 and further ports in the valve and cylinder casing to bring the electrode 13 into contact with the work A. On further pressure of the button the contact 43 bridges contacts 44, so as to connect the welding current and also the current to the motor for rotating the electrode 6. An automatic timing device, preferably driven by the motor, may be provided for intermittently interrupting the welding current to produce a series of spot welds. When the welding operation is to be discontinued the push button is released. The electrode 13 may be driven instead of or together with the electrode 6. The electrodes may be cooled by fluid circulating through conduits 16, 17 and cavities in the electrode spindles and rollers. The circumferential faces of the electrodes may form a line contact for the full width thereof.
Patent GB-1191064-A (GB)
Title: Color Killer Circuits
Inventor: AUSTIN WAYNE MILLER
IPC: H04N9/71
Filed: 1968-05-30
Abstract: 1,191,064. Television. RCA CORPORATION. 30 May, 1968 [12 June, 1967], No. 25940/68. Heading H4F. A colour television receiver, having a colour reference oscillator synchronized by signals present only during the reception of colour signals, is provided with a colour killer circuit in which the chrominance channel is enabled or disabled in the presence or absence respectively of colour signals by the variation of a D.C. voltage component developed across a bypassed load resistor in the output of the oscillator, which voltage varies in proportion to a D.C. voltage component developed at the input of the oscillator by means responsive to the synchronization signals. As shown, Fig. 1, the colour subcarrier local oscillator comprises an N channel depletion mode IGFET 71 and is phase locked to a ringing circuit driven by a burst amplifier 116. The gate 136 of FET 71 is negatively biased by rectifying part of the input by means of diode 158. In the absence of colour synchronizing burst signals the bias voltage is derived from the oscillator feedback and a relatively large current flows through FET 71 and provides a large P.D. across load resistor 146. This P.D. is applied to colour killer amplifier transistor 162 which saturates so that flyback pulses applied via capacitor 176 are rectified by diode 178 to produce a pulsating negative voltage at point 172 which is smoothed and applied as bias to cut off the bandpass chrominance amplifier 38. When colour burst signals are received they are applied to the ringing circuit, the output of which is applied to the oscillator resulting in an increase in the negative bias produced so that the current through FET 71 and load resistor 146 is reduced cutting off transistor 162 and removing the negative bias to bandpass amplifier 38 to allow it to conduct chrominance signals to the detection system 62. A variable resistor 152 allows the drain current of FET 71 to be set within a desired range and also provides a threshold control for the onset of colour killer action. The chroma and burst signals are keyed by pulses produced by keying pulse amplifier 84 driven by flyback pulses from the deflection system 72. In a modification, Fig. 3 (not shown), the P.D. developed across the oscillator load resistor (146) is directly applied as bias to the bandpass chrominance amplifier, which in this case is a bipolar transistor (190), without the interposition of a colour killer amplifier. A circuit using a two-gate P-channel enhancement mode IGFET with consequential changes in the colour killer and bandpass amplifiers is described, Fig. 2 (not shown).
Patent GB-938574-A (GB)
Title: Band type friction coupling comprising a clutch or brake
IPC: F16D27/105
Filed: 1960-07-22
Abstract: 938,574. Band brakes. WARNER ELECTRIC BRAKE & CLUTCH CO. July 22, 1960 [Aug. 3, 1959], No. 25691/60. Class 103 (1). [Also in Group XXIV] A friction coupling, which may be either a clutch or a brake, comprises two relatively rotatable drums or the like disposed end-toend on a common axis, a free floating friction band surrounding the adjacent end portions of the drums and being changeable in diameter to grip the drums, a helical coil loosely telescoped with the band being tightened thereon by energization of an electromagnet attracting the last coil thereof into engagement with an armature fast with one of the drums to transmit torque from the relative rotation of the drums &c. between the two ends of the coil and thereby compress the band radially on to the drums. The band may be either a flat band, or may have frusto-conical side faces engaging corresponding frusto-conical faces on the adjacent drums. As shown, a brake between a wheel 55 rotatable about a stub-axle 56 carrying a stationary brake drum 58 comprises drum surfaces 30, 32 surrounded by a band 14 which may be split as at 34. A stationary solenoid 47 co-operates with a pole-piece 64 formed with a V-shaped insert 40a of non-magnetic material and mounted in the wheel 55 to produce a flux path 41 when energized, thus attracting the ends 17, 17a, of a helical coil-spring 15 into frictional engagement therewith. The hand of the coil-spring 15 relative to the direction of rotation of the drum 55 is so chosen that the coil spring 15 is then tightened upon the band 14, which is in turn tightened upon the drum surfaces 30, 32 for brake engagement. To obtain braking in the reverse direction of rotation, a similar split band 73, surrounding the coil spring 15 and normally contracted thereonto, is expanded on energization of the stationary solenoid 47 into engagement with friction drum surfaces 74, 75 on the wheel and the stationary brake drum 58. In modified constructions for use as clutches (see Group XXIV), three split rings are provided at each end of the band 14, to act as selfenergizing servos and increase the tightening effect obtained on energization of the solenoid, and one end of the coil spring 15 is secured to the driven clutch member. In another embodiment for use as a clutch, the band 14 has frustoconical end friction faces engaged with corresponding drum surfaces on driving and driven members, and may consist of independent metal segments. The band 14 may be of bronze or asbestos material, and the spring 15 of steel.
Patent GB-674313-A (GB)
Title: Improvements in or relating to the manufacture of manganese dioxide
IPC: C01G45/02
Filed: 1950-10-25
Abstract: Manganese dioxide is manufactured by (a) reacting manganous sulphate solution with a substantially equimolecular amount of calcium chloride (b) reacting the separated manganous chloride solution with 20-40 per cent excess lime and passing an oxygen-containing gas, e.g. air, through the suspension at say, 55-60 DEG C. whereby say, 80 per cent of the divalent manganese is oxidized to the tetravalent state (as in the Weldon process); and (c) chlorinating to complete the oxidation.  The manganous sulphate solution may be obtained from organic oxidations, or by leaching ores with sulphur dioxide or trioxide and/or sulphuric acid, and may contain ammonium sulphate which is reacted in step (a) with an equimolecular amount of calcium chloride, and sulphuric acid and ferrous, ferric and other heavy metal sulphates which are reacted in step (a) with milk of lime, the hydroxides and organic impurities precipitated being removed with the calcium sulphate.  Step (b) is preferably carried out in two stages, a portion of the manganous chloride being first reacted with all the lime and oxidized, and the remainder being then added with continued oxidation.  The manganese dioxide from step (c) contains a little lime which may be extracted with hydrochloride acid.  Calcium chloride solution circulates in the process.
Patent GB-1422663-A (GB)
Title: Marine bunkering
IPC: B63B27/24
Filed: 1973-05-29
Abstract: 1422663 Liquid transfer apparatus EMCO WHEATON UK Ltd 19 April 1974 [29 May 1973] 26074/73 Heading B8E Liquid transfer apparatus mountable on a barge for bunkering a ship comprises reach arms 1, 2 mounted on a base 4 and relatively pivotable by rams 18, 20 and swivable on the base by a slew motor 16. The outer end of the reach arms mounts an assembly 5 having an inner arm 24 and outer arms 32 leading to movable bases 6, 7 supported on a platform 46 which also accommodates the operator and his control console 49. Swivel joints 25, 34 actuated by motors 50, 52 allow slewing of the platform 46 in a desired horizontal plane. An articulated linkage 26-29 connected between the base 4 and the outer end of the arm 2 ensures that in all positions of the arms 1, 2 the inner arm 24 of the assembly 5 and hence also the platform 46 remains horizontal while the pivoted outer arms 32 allow the bases 6, 7 to be extended and retracted.
Patent GB-734094-A (GB)
Title: A new or improved process for the production of refractory metals
IPC: C25C3/28
Filed: 1952-10-17
Abstract: 734,094. Electrolytic production of refractory metals. TITAN CO., Inc. Oct. 17, 1952 [Oct. 18, 1951], No. 26086/52. Class 41. A. method for the electrolytic production of refractory metal in an electrolytic cell having a cathode, an anode and a fused halide salt electrolyte comprises continuously introducing below the surface of the electrolyte a halide of the metal to be reduced, meanwhile concurrently passing electric current through the cell between the cathode and anode at a rate appropriate to the rate of metal halide addition so that the amount of current is sufficient to reduce the metal halide substantially directly to metal, the metal halide being added in juxtaposition to the cathode to contact the surface thereof. The refractory metal may be cerium, hafnium, thorium, titanium, zirconium, vanadium, niobium, tantalum, chromium, molybdenum or tungsten. The electrolyte may be a halide or halide mixture of alklai or alkaline earth metals, including magnesium, particularly the chlorides; a low melting-point eutectic, such as a mixture of sodium chloride with strontium or magnesium chloride, is preferred. A cell, as shown in Fig. 1, may be used, which is heated by graphite electrodes 12 and has a cathode 14 and anode 15. Titanium tetrachloride is introduced by a conduit 16 terminating close to the bottom of the cathode 14. A barrier 17 extending beneath the surface of the molten electrolyte 13 separates the cathode from the anode. A vent 18 removes gaseous products from the anode section of the cell. Titanium metal 19 is deposited on the cathode 14. An alternative cathode 14A (Fig. 3) is a hollow tube of tantalum or nickel metal through which titanium tetrachloride gas is passed, a porous mass of titanium metal 20 being formed, having a hollow portion, and confining the reduction of the tetrachloride to the metal to the immediate vicinity of the cathode. In a modification the cathode is a hollow tube connected to and extending into a porous container or basket containing closely packed titanium metal particles also in contact with the tube. 4.5 to 5.0 faradays of electricity are passed for every mol. of titanium tetrachloride introduced. Slightly more than 5 faradays of electricity may be passed, when obtaining molybdenum from molybdenum pentachloride, for every mol. of pentachloride introduced, and slightly more than 4 faradays when obtaining vanadium from vanadium tetrachloride, for every mol. of tetrachloride introduced. A cathode current density of 1 to 6 amperes per square centimetre, such as 3 amperes per square centimetre, may be used. Specification 678,807 and U.S.A. Specification 2,205,854 are referred to.
Patent GB-188481-A (GB)
Title: Improvements in roller bearings
IPC: F16C33/54
Filed: 1921-10-03
Abstract: 188,481. Scribner, W. L., and Dawson, R. T. Oct. 3, 1921. Roller bearings.-A cage for a conical roller bearing is made resilient so that the cage, with the rollers 3 assembled therein, may be sprung into the outer cone 1 over a retaining rib 4 located at the larger end. The cage is formed from sheet metal and comprises a smaller circular ring 8 and a larger sinuous ring 9 connected by ribs 7. The sinuous form renders the cage resilient. Inwardly-extending flanges 10, which are cut out of the sheet metal to provide recesses for the rollers, conform to the surfaces of the rollers.
Patent GB-651336-A (GB)
Title: Improvements relating to photographic and cinematographic cameras
IPC: G03B13/02
Filed: 1947-09-26
Abstract: 651,336. Photographic cameras. PIGNONS SOC. ANON. Sept. 26, 1947, No. 26121. Convention date, May 30. [Class 98 (i)] A photographic or kinematographic camera having interchangeable lenses of different focal lengths and a view-finder is characterized in that the view-finder comprises at least one Galilian telescope carried in the camera body by a support which is pivoted about an axis perpendicular to a viewing axis on which two openings in the camera body are centred so that the telescope can be used as such or in a reversed position as a reducing device, and in that the support is provided with an operating member enabling the optical axis of the telescope to be brought into coincidence with the viewing axis. As shown in Fig. 1, the camera body 6 has openings 9, 10 centred on the viewing axis 11 and carries on a shaft 4, rotatable by a knob 7, a support 3 housing a Galilean telescope comprising lenses 1, 2. The support 3 may be provided with openings centred on an axis normal to the shaft 4 and the viewing axis 11 so that these openings and the telescope can be aligned with the viewing axis alternatively. The telescope, when used to form a magnified or reduced image of the object to be photographed, has in each case a field of view corresponding to that of one of the lenses provided with the camera. Other forms are described wherein the view-finder includes two Galilean telescopes with their axes orthogonal or three such telescopes with their axes relatively inclined at 60 degrees. The telescope in use is indicated by a mark on the knob 7, this mark co-operating with a scale indicating the focal lengths of the camera lenses which may be employed. The camera may be used in conjunction with a range-finder, one end of the prismatic base of which is positioned between the opening 10 and the telescope support 3. In order that only the correct lens may be mounted on the camera, each lens mount 25 is provided with a collar 31, Fig. 8, having an arcuate groove 32, centred on the lens axis and of a radius corresponding with the focal length of the lens. If the lens is correct, the end 34 of a lever 21, pivoted in the camera, will engage this groove, since the position of this end 34 relative to the camera axis is determined by a cam 20 which is rotated by knob 7, and thus allow the lens mount to be secured to the camera.
Patent GB-745267-A (GB)
Title: Improvements in or relating to the bleaching of vegetable fibres
Inventor: RICHMOND KENNETH WILLIAM
IPC: D06L4/10
Filed: 1953-09-23
Abstract: Vegetable fibres are contacted with an alkaline peroxide solution when at a temperature above 100 DEG C. and under a pressure above atmospheric pressure.  The fibres may be saturated with an aqueous solution of an alkali and a peroxide stabilizer and hydrogen or sodium peroxide may be added when the temperature of the first solution is above 100 DEG C., or the fibres may be saturated with an unneutralized, acid solution of hydrogen peroxide and an alkali and a peroxide stabilizer added when the temperature of the first solution is above 100 DEG C.  The fibres may be cheeses, beams or other packages of cotton and linen.  The pressure does not exceed that at which the liquid is required to boil, and the liquid may be at the boiling temperature.  In an example, cotton yarn is immersed in a solution containing magnesium sulphate, sodium silicate and sodium hydroxide and a mixture of sodium salts of secondary alkyl sulphates containing 12 to 18 carbon atoms in the molecule, in a vessel equipped with a blow off valve set to operate at a temperature of 120 DEG C.  When this temperature is reached, hydrogen peroxide is added. Specification 490,382 is referred to.
Patent GB-1385296-A (GB)
Title: Belt for a surgical gown
IPC: A41F9/02
Filed: 1973-06-01
Abstract: 1385296 Belts KENDALL CO 1 June 1973 26246/73 Heading A3V A belt for a sterile operating theatre gown comprises two end portions 14, 16 which may have protective covers 18, a portion 22 with a tacky surface or other means for attachment to a gown and an intermediate compacted portion 20 with multiple transverse pleats or crimping 21 which is extensible in response to tension between two and seven times its original length. A second extensible portion 23 may also be provided.
Patent GB-746509-A (GB)
Title: Improvements in or relating to stabilized compositions comprising monomeric vinylidene cyanide
Inventor: ARDIS ALAN EDRIC
IPC: C08F2/38
Filed: 1953-09-24
Abstract: Crude unstable monomeric vinylidene cyanide is stabilized by means of a sulphonic acid or acid halide thereof having the general formula R.SO2.X, wherein R is a hydrocarbon radical or halogen substituted hydrocarbon radical and X is hydroxyl, chlorine, bromine or fluorine. In particular, the crude product containing vinylidene cyanide obtained by pyrolysis of 1-acetoxy-1,1-dicyanoethane may be so stabilized.  Thus, the stabilizer may be added to the 1-acetoxy-1,1-dicyanoethane before its pyrolysis; alternatively it may be sprayed into the condensing pyrolysis product as the vapours enter the receiver for the product or the stabilizer may be placed in the receiver. When the pyrolysis product vapours are quenched in a quench liquid as described in Specification 746,507, the stabilizer may be incorporated in the quench liquid.  The stabilizers are used in amounts of about 0.1 to 10 per cent or more by weight of the crude vinylidene cyanide.  Examples illustrate the use as stabilizers of benzene-, chlorobenzene- and p-toluene-sulphonic acids, and p-toluene-, methyl-, benzene-, benzyl- and cyclohexanesulphonyl chlorides.  Many other such stabilizers are listed including chlorbutane-, decane-, brombenzene-, iodobenzene-, fluorobenzene-, naphthalene- and phenyl methane-sulphonic acids and hexane sulphonyl chloride and o-toluene sulphonyl fluoride or bromide. Specifications 653,468 and 677,825 also are referred to.
Patent GB-1017077-A (GB)
Title: Improvements in or relating to steel-wire ropes
IPC: D07B1/06
Filed: 1962-07-10
Abstract: 1,017,077. Ropes. H. BINDSCHADLER. July 10, 1962 [July 11, 1961], No.26424/62. Heading D1T. The outermost layer of steel wires 3 of each strand 1 is provided with a zinc coating, the inner steel wires4, 5, 6 being uncoated. The rope may have a hemp core 2 surrounded by inner strands of steel wires (not shown). Where inner strands of steel wires are present, the steel-wires of the outermost layer of each such strand may have a zinc coating.