baber/WOPTO huggingface dataset:
Patent GB-1455621-A (GB)
Title: Frequency and phase control apparatus
IPC: H03L7/091
Filed: 1974-01-23
Abstract: 1455621 Automatic frequency control system; frequency and phase detectors SONY CORP 23 Jan 1974 [29 Jan 1973] 01372/74 Heading H3A An automatic frequency and phase control system comprises: means for generating a sawtooth signal having the same frequency as that of a voltage controlled oscillator 1; a sample and hold circuit 3 fed with the sawtooth and a reference signal and producing a D.C. signal proportional to the phase difference between them to control the frequency of the oscillator 1; and a frequency discriminator 4 which, when the frequency of the oscillator 1 is outside a desired range, produces an output which holds the amplitude of the sawtooth signal at its maximum or minimum value to bring the frequency back to within the range. Frequency Comparator.-An input pulse train la, Fig. 3, is fed to a transistor 22 so as to switch it on to periodically discharge capacitor 23. In between pulses, the capacitor charges to produce a sawtooth signal whose amplitude varies with frequency and which is integrated to provide a D.C. control signal which is applied to longtailed pairs comparator 27, 28. The reference input to the comparator is so set that, at the desired frequency, the two inputs are equal. In this condition the voltages at the bases of transistors 29, 30 are equal and transistors 29, 30, 31, 32 are cut off. If the frequency at input 1a becomes higher than the required frequency the voltage at the base of transistor 27 falls below the reference voltage at the base of transistor 28 and transistors 29, 31 become conductive. Conversely if the frequency becomes lower the base potential of transistor 27 rises, and transistors 30, 32 become conductive. Phase comparator.-If the signal at la is at its nominal frequency (ie. transistors 31, 32 both cut off) it is applied to bootstrap circuit 6 to charge and discharge capacitor 10 and produce a sawtooth signal which is fed to sampling gate 13a.... 13d where it is sampled by pulses from the reference oscillator applied at input 2a. The samples are integrated by capacitor 19 to provide an output control signal proportional to the phase difference. If the signal at 1a is not at its nominal frequency, the base of either transistor 9 or transistor 12 is earthed by the conductive transistor 31 or 32 and the bootstrap output is locked to its maximum or minimum value to give a maximum or minimum control signal to return the oscillator to its locking-in range.
Patent GB-619401-A (GB)
Title: Improvements in or relating to machines for grinding cutting blades
IPC: B24B3/42
Filed: 1946-12-06
Abstract: 619,401. Grinding cutting edges. REYNOLDS, C. G., and SAYERS, A. G. Dec. 6, 1946, No. 36179. [Class 60] A machine for grinding cutting blades formed with a clearance at the back of the cutting edge thereof, comprises in combination blade supporting means for a blade to be ground, a grinding wheel having two grinding faces, one for grinding in a substantially vertical plane and the other for grinding in a non-vertical plane, driving means to rotate said grinding wheel, a carriage for the grinding wheel and driving means, means to move the carriage relatively to the support whereby the grinding wheel traverses a blade during a grinding operation and blade positioning means to maintain the portion of a blade to be engaged by the grinding wheel substantially parallel with the appropriate one of said grinding faces thereof at the instant of engagement, whereby a blade can be ground while maintaining the clearance at the back of the cutting edge of the blade. For grinding a helical rotary blade HL of a lawn mower, Fig. 4, the rotary blades are mounted in or between adjustably fixed pillars 13 while a cup-shaped grinding wheel 23 is traversed past with its vertical flat annular face in contact with the blade being ground. The downwardly moving side of the face of the grinding wheel 23 engages the blade and does so at a position below the axis of rotation of the blade, a finger 31 on the grinding wheel carriage contacting the underside of the blade being ground and co-operating with the downwardly moving side of the grinding wheel to rotate the blade as the grinding wheel carriage is traversed. The carriage is traversed by turning by rotation of a hand-wheel 30, a pinion in the carriage which engages a fixed rack 25. When a flat ledger blade FB is to be ground, Fig. 5, the blade is supported by a pair of discs 39 mounted on the pillars 13 and having apertures of various sizes to take the stub shafts of different types of ledger blades, an indexing pawl and peripheral notches on the discs allowing of correct positioning of the stub-shafts. The blade FB is set so that the edge is at the correct angle to the vertical by an adjustable screw 45 and the grinding wheel 23 is traversed with its conical face 23a engaging the blade edge. The grinding wheel may be moved in a direction normal to the traverse by means of a handwheel 36 and associated screw and nut mechanism.
Patent GB-644409-A (GB)
Title: Improvements in electric discharge lamps
IPC: H01J61/067
Filed: 1948-02-04
Abstract: 644,409. Discharge lamps. BRITISH THOMSON-HOUSTON CO., Ltd. Feb. 4, 1948, No. 3287. Convention date, Feb. 5, 1947. [Class 39 (i)] The electrodes of a gas discharge lamp comprises a thermionic cathode 2 and two coiled wire anodes 3, 4 arranged in the form of a double helix. The anodes may be of nickel, aluminium or molybdenum and the cathode of a coiled or coiledcoil tungsten wire with a loose over-winding of finer tungsten wire and activated with an alkaline earth oxide. The gas filling may be mercury with neon or argon at 4 mm. pressure, 7 and the container may be coated with a fluorescent material. The invention may be applied to a double-ended lamp (Fig. 2, not shown).
Patent GB-750305-A (GB)
Title: Improvements in axial-flow compressor, turbine and like blades
Inventor: WHITEHEAD DENIS SWORD
IPC: F01D5/14
Filed: 1953-02-05
Abstract: 750,305. Boundary layer control. ROLLSROYCE, Ltd. Feb. 5, 1954 [Feb. 5, 1953], No. 3339/53. Class 4. A blade 10 for an axial flow turbine or compressor is provided on one or both surfaces with a spanwise-extending continuous or intermittent recess 15 located chordally at a point or points upstream of the position at which the boundary layer would otherwise break away. The presence of the recess converts the laminar flow into tubulent flow to delay the breakaway.
Patent GB-884153-A (GB)
Title: Polyurethane compositions
Inventor: CROWLEY GERALD PATRICK
IPC: C08K3/36
Filed: 1959-01-30
Abstract: A process for incorporating silica fillers in polyurethanes comprises dissolving the silica filler in a fatty glyceride containing hydroxyl groups or a liquid polymeric organic hydroxyl group-containing substance which may contain other groups having active hydrogen atoms or with a prepolymer and thereafter converting the hydroxyl group-containing substance or prepolymer into a polyurethane. Conversion of the propolymers to polyurethanes can be effected by reaction with diols or triols, e.g. ethylene or, propylene glycol, 1:3- or 1:4-butanediol, glycerol or tri-hydroxymethyl propane or with polyamines, e.g. ethylene or hexamethylene diamine, benzidine, dichlorobenzidine, diamino-diphenyl-methane or dichlorodiamino-diphenylmethane.  The fillers may be acid, alkaline or neutral silicas and may be obtained artificially, such as products obtained by acidification of sodium or potassium silicates followed by washing and drying. Diatomaceous earths may also be employed.  The resulting silicas may be partially hydrated.  When the fillers are mixed with the hydroxyl group-containing substances in the liquid condition they swell and dissolve.  Lists are given of suitable polyisocyanates, polyethers and reactants from which polyesters can be prepared. Polyesteramides obtained by including, e.g. ethanolamine, propanolamine, ethylene or hexamethylene diamine, diaminodiphenyl-methane and benzidine with the polyester-forming reactants are also suitable.  In Example (1) partially hydrated silica is agitated while heating under reduced pressure with a dehydrated polydiethylene glycol/pentaerythritol adipate to give a clear solution.  This is cooled to 80 DEG C. and reacted with mixed 2:4- and 2:6-tolylene diisocyanates and after degassing the product is cast into moulds and cured at 110 DEG C.  Similarly employed are (2) polyethylene glycol adipate, a polyester from glycol and terephthalic and adipic acids, with mixed isocyanates from an aniline/o-toluidine/formaldehyde condensation product, (3) castor oil and 2:4-tolylene diisocyanate, to give a cold-jointing compound or a heat-resisting cement for electrical components. Specification 733,624 is referred to.
Patent GB-1496811-A (GB)
Title: Construction units
IPC: B63B3/08
Filed: 1976-01-23
Abstract: 1496811 Coupling buoyant units MACKLEYACE Ltd 23 Jan 1976 [27 Jan 1975] 3378/75 Heading B7S Construction units 1, 1a, e.g. parts of a pontoon, are interconnected by a coupling member 40 with tapered projections 44 engaging staple members 8 on units 1, 1a and an apertured part 41 secured to apertured lugs 11 on the units by pins or bolts. The units may have detachable skirt portions, Figs. 2 and 5 (not shown), for forming a gas or liquid cushion, the skirt portions being stowable within the units for transport. Skirt-carrying units may be partly filled with foam material for buoyancy.
Patent GB-1559491-A (GB)
Title: Change speed gear boxes
Inventor: AHLEN KARL GUSTAV
IPC: F16H3/66
Filed: 1976-01-29
Abstract: The epicyclic gear change box has a planet carrier (20), the planet gears (24, 26) of which have at least two axially successive portions of different diameters which mesh exclusively with sun gears (30, 32 and 34, 40 respectively). The sun gear (30) is firmly connected in terms of rotation to the gearbox input shaft (I) while the output shaft (O) is connected to the planet carrier (20). The other sun gears (32, 34, 40) are connected to friction brakes (42, 48, 76) and can be fixed against rotation by servos (50, 44, 74) fixed to the housing. The gearbox has three forward speeds and one reverse speed. The hydraulically activated gearbox avoids concomitantly rotating servomotors and can be shifted with the smallest possible quantities of hydraulic fluid. <IMAGE>
Patent GB-993829-A (GB)
Title: Apparatus for determining the breaking strength of suddenly breaking test samples, for example of cement or the like
IPC: G01N3/02
Filed: 1964-01-28
Abstract: 993, 829. Testing physical qualities of materials. W. GRAETZ. Jan. 28, 1964, No. 3581/64. Heading G1S. Apparatus for determining the breaking strength of test samples of cement or asbestos cement suddenly breaking under the action of a continually increasing load comprises a ram F driven electrically or by a pressure medium, electrically operated apparatus C for tracing a deformation diagram and a microphone A close to the anticipated point of breakage G which converts the breaking sound energy into an electric impulse and applies it to an amplifier B equipped with a thyratron, output impulses being used to stop the tracing and, if desired, to switch off the feed movement of the ram F.
Patent GB-383265-A (GB)
Title: Improvements in or relating to pneumatic blow-out switches
IPC: H01H33/70
Filed: 1931-02-04
Abstract: 383,265. High-tension switches. SIEMENS - SCHUCKERTWERKE AKT.- GES., Siemensstadt, Berlin. Feb. 4, 1931, No. 3588. Convention date, Feb. 7, 1930. Void [Published under Sect. 91 of the Acts.] [Class 38 (v).] In a switch with nozzletype contacts and a gas-blast blow-out, the gas blast draws into the arc gap a solid quenching substance such as a dust so that the carriers of electricity within the arc space are mass-loaded and the arc quenched. In the arrangement shown in the Figure, a hollow movable electrode 13 through which the gas blast is supplied has an annular subsidiary passage 16 through which the dust or powder is drawn from the supply pipe 18 by the injector action of the gas blast on break acting through the main passage 14. When the electrode, with its arc tip 20, is withdrawn from the nozzle-contact 11, ports 15 are exposed to the gas pressure within the switch-chamber and a gas blast is produced both around the exterior of the electrode and through its interior 14. The interior blast draws the dust through the ports shown from the supply pipe 18 and forces it .through the passage 16 and past the arc tip into the arc space.
Patent GB-932042-A (GB)
Title: Full size range centrifugal heavy media separation
IPC: B03B5/34
Filed: 1961-01-31
Abstract: 932,042. Separating solids. AMERICAN ZINC, LEAD & SMELTING CO. Jan. 31, 1961 [Feb. 16, 1960], No. 3633/61. Class 117. A continuous process of separating non-magnetic particles of different specific gravities from mixtures thereof comprises: (i) introducing the mixture into one end of the inner of two concentric vortices of whirling heavy-density fluid constituted by a suspension of finely divided magnetically susceptible material which, under the influence of centrifugal force, produces an apparent fluid density between the specific gravities of the particles; (ii) collecting a light fraction axially from the opposite end of the inner vortex; (iii) collecting a heavy fraction from the periphery of the outer vortex; (iv) draining and washing the fractions; (v) subjecting the underflow to at least one magnetic separation; (vi) recovering clean light and heavy products; (vii) recirculating the magnetically cleaned magnetic solids to the whirling zone without demagnetization. Reference is made to U.S.A. Specification 2,917,173 which describes the production of the concentric vortices. The ore is screened at 1, unless comparatively free from slimes, and the underflow passes through a classifier 2 to the whirlpool to which oversize passes direct from the screen. The light fraction passes, with associated fluid, to a drainage screen 6 and the heavy fraction, with fluid, to a drainage screen 7. Oversize from the screen 6 proceeds to a washing screen 8, and from the screen 7 to a washing screen 9. The underflow of the screen 8 is magnetized in a magnetizer 13, thickened in a thickener 15, and passed on to magnetic separators 17. The underflow from the screen 9 similarly passes through a magnetizer 14 and thickener 16 to a magnetic separator 18. The underflow from the screens 6 and 7 is divided, part going to fine screens 11, 12 and part joining the underflows from the screens 8, 9. The magnetic separators produce non-magnetic products which constitute light and heavy concentrates at 20, 21. The oversize from the screens 8, 11 are added to the light concentrate and the oversize from the screens 9, 12 to the heavy concentrate. The magnetic medium solids are densified at 19 and reused with the addition of water to correct the concentration of the liquid medium. The underflow from the screens 11, 12 is returned to the whirlpool. If the ore has only a little fine material the screens 11, 12 may be dispensed with; if the content of fines is high, all the underflow from the screens 6 and 7 may pass through magnetizers and thickeners to magnetic separators.
Patent GB-764555-A (GB)
Title: Agitator
IPC: A47J43/12
Filed: 1955-02-08
Abstract: 764,555. Egg whisks. FJELLSTEDT, S. A. R. Feb. 8, 1955 [March 3, 1954], No. 3660/55. Class 86 An agitator particularly intended for whipping cream and scrambling e g g s comprises tubes 4 of tightly spun coil springs connected to a handle 1 which is adapted to be connected to a source of compressed air, the openings between the coils of the tubes 4 permitting discharge of the compressed air during operation of the agitator. As shown the handle 1 is provided at one end with a connection piece 2 for a hose or the like, and at the other end is screwthreaded for attachment of a support 3 for the springs 4. The springs are bent to form loops, each end being inserted into a hole 5 in the support and being secured by sealing means 8. A filter 7 prevents impurities from entering the end of the springs, through which end the compressed air is supplied. The springs may be strengthened by piano wire disposed inside them. In an alternative construction each spring is connected to the support 3 at one end only, the other end being closed.
Patent GB-746540-A (GB)
Title: Safety apparatus for use in rapidly-moving vehicles
IPC: B60R22/18
Filed: 1954-02-08
Abstract: 746,540. Aircraft safety devices. STURGESS, Inc. Feb. 8, 1954 [Feb. 10, 1953], No. 3689/54. Class 4. An inertia operated safety-device for automatically limiting the movement of a body, comprises a tension member adapted to be fixed to the body and adapted to be fed out from the device in response to a loading thereon which results in an acceleration of the tension member less than a predetermined value, and inertia operated means adapted to lock the tension member, in such a manner as to prevent the feeding out thereof from the device, in response to a higher loading on the tension member which results in an acceleration of the tension member greater than the predetermined value. The device is particularly applicable to restraining violent motion of an aircraft pilot, as in Fig. 1, where a head-rest 2 is supported on a frame from the seat back, and two straps 16 are attached at one end to a tension member 13 and run through loops 17 over the pilot's shoulders and are fastened to his waist strap 7. The tension member 13 is wound on a drum 44 (Fig. 2) rotatable on a pivot 37 which also mounts a fly-wheel epicyclically geared, preferably in a ratio of four to one, by gears 42, 48 to the drum 44. Pivot 37 is slidable in the direction of motion of tension member 13 in slots in the casing of the device 9, and extends through an aperture in a lever 28 pivoted to the casing at 25 and biased clockwise by a spring 63. Pivot 37 is also biased into a notch 32 by a coil-spring which acts to wind up the drum 44 and take in the slack of the tension member, the coil spring being adjustable, one end being fastened to a sector 54 fixable by a bolt 55. A small acceleration of the pilot relative to the seat, such as is caused by normal movement, sets the fly-wheel rotating as tension member 13 is paid out. The coil-spring takes in any slack. A violent motion giving a high tension in member 13, however, jerks the drum and fly-wheel on pivot 37 in the direction of the tension, and lever 28 is rotated by spring 63 so that notch 34 engages and retains pivot 37. Ratchet teeth 57 on the drum are brought into contact with a spring-biased pawl 58 to lock the drum to prevent paying out of the cable 13. To release the lock, a lever 12 (Fig. 1) is moved by the pilot, so that a knob 65 pulls the lever 28 anticlockwise, and the coil spring biases the pivot down to notch 32 again. The device may be manually locked by moving lever 12 its full distance, so that lever 28 is rotated further anticlockwise, and pivot 37 rides up into notch 33, again bringing teeth 57 into contact with pawl 58, which is resiliently mounted so that slack in the cable can be taken up at any time.
Patent GB-480764-A (GB)
Title: Improvements in or relating to meat tendering apparatus
IPC: A22C9/00
Filed: 1936-08-31
Abstract: In meat-tendering apparatus of the kind in which a plurality of knives are arranged to move through a guiding grid to pierce the meat beneath them, the grid is vertically movable and is locked against upward movement by a ratchet device which becomes operable when the grid is arrested during the descent of the knives. Specification 480,763 is referred to, and the invention is described as applied to the apparatus described in that Specification.
Patent GB-313421-A (GB)
Title: Process for the manufacture of condensation products from alicyclic ring-ketones
Filed: 1928-02-07
Abstract: 313,421. Carpmael, A., (I. G. Farbenindustrie Akt.-Ges.). Feb. 7, 1928. Samples furnished. Substituted aromatic amines.-Compounds of the formulae in which R represents an aromatic residue, R1 an alicyclic hydrocarbon residue, and X1, X2 either hydrogen or alkyl or aralkyl groups, are obtained by heating an aromatic amine containing a free p-position to the amino group with an alicyclic ketone or alkyl derivative thereof in the presence of an acid and, if desired, under pressure. Alternatively, a salt of the amine is condensed with the alicyclic ketone. In either case, water is eliminated by interaction of the heto group, or the enolic hydroxy group, with the hydrogen in the p-position of the aromatic amine. Alicyclic ketones mentioned are cyclohexanone, cyclopentanone and their homologues, and the Provisional Specification also refers to tetralone and decalone and their homologues. Hydrochloric, hydrobromic, sulphuric, oxalic and benzenesulphonic acids are specified as acid condensing agents. The proportion of the di- and tri-nuclear components in the products is dependent on the reaction conditions; excess of amine favours the formation of the tri-nuclear compound, whilst increase in temperature or of the amount of acid employed is conducive to the production of the di-nuclear compound. The components may be separated by fractional distillation or by selective treatment with organic solvents or by crystallization of their salts. Furthermore, the tri-nuclear products may be converted into the corresponding di-nuclear products by heating them, preferably in presence of an acid, acid salt or easilydissociating salt, whereby a molecular proportion of amine is split off. The products are useful as intermediates in the preparation of dyestuffs and pharmaceutical products. Examples are given of the condensation of cyclohexanone with aniline. o-chloraniline, o-toluidine, o-anisidine, monoethvlo-toluidine and dimethylaniline, and of p-methylchyclohexanone with o-toluidine. The conversion of some of the trinuclear condensation products into the dinuclear form by heating with sulphuric acid, hydrochloric acid, zirconium oxychloride, zinc chloride, ammonium chloride, and sodium bisulphate or by distillation in vacuo is also described.
Patent GB-546504-A (GB)
Title: Improvements in and relating to gyroscopic apparatus
IPC: G01C19/44
Filed: 1941-03-20
Abstract: 546,504. Gyroscopic apparatus. SPERRY GYROSCOPE CO., Inc. March 20, 1941, No. 3839. Convention date, March 20, 1940. [Class 97 (iii)] In a gyroscopic apparatus, especially an artificial horizon, a casing containing an electrically driven rotor is provided internally with means whereby the air drawn into the casing by the rotor is directed in a helical path to air flow gyro-erecting means. As shown in Fig. 4, air is drawn into the rotor casing through holes 54 and is thrown tangentially from the smooth periphery of the rotor 10 so as to travel down a helical channel 32 to a chamber 36. The chamber is provided with outlet ports 28 cooperating with two pairs of knife-edged erecting pendulums 21 arranged at right angles and pivoted on the rotor casing. The rotor 10 is of tubular form so as to house at the lower end, the pivots 22 of the pendulums, and at the upper end to accommodate the stator 14. The individual pendulums of each pair are rigidly connected together. The rotor shaft passes through the stator and is supported in bearings 12, 121. The rotor is driven by three phase current supplied to the stator across the trunnions of the gimbal ring. Two of the three leads carry through blade spring contacts abutting against the pointed ends of the trunnions (such as the spring contacts 44, 441 of the minor trunnions) and the third lead carries through a light hair spring 47. A similar arrangement is provided for the major trunnions.