baber/WOPTO huggingface dataset:
Patent GB-1194900-A (GB)
Title: Improvements in or relating to Frequency Shift Keying Circuit Arrangements
IPC: H04L27/20
Filed: 1967-10-20
Abstract: 1,194,900. Digital transmission systems; wave shaping networks. ALBISWERK ZURICH A.G. 20 Oct., 1967 [21 Oct., 1966], No. 47805/67. Headings H3U and H4P. A frequency shift keying circuit, Fig. 1, comprises a source of two square-wave signals A, C, Fig. 2, of frequencies n and m times the bit rate of D.C. keying signals G, G, where n-m = 1, the square wave signals feeding respective integrators 1, 2 which develop triangular signals B, D, the latter being gated by the keying signals to give a combined signal E which is converted to sinusoidal form by a wave shaper, Fig. 3. Discontinuities in the sinusoidal signal at the bit transition points are eliminated by inverting appropriate sections of the signal. The instants at which inversion is necessary are determined by unit 12 which is fed by the keying signals G, G and by the lower frequency square wave C. Differentiating gate 13 provides a pulse H at each bit transition, so gate 14 pulses (I) whenever a transition coincides with a negative-going section of the square wave. Pulses I feed bistable 15 which generates signals K, K which enable gates 10a, l0b alternately to pass either F or F to the output. The resulting sinusoidal waveform L exhibits no sudden transitions in phase or amplitude; transition from one frequency to the other takes place at the maxima of the sinusoids. The wave shaper, Fig. 3, is fed at K1 by the triangular signal E and the sinusoidal signal F appears at K2. The shaper has two voltage dividers R5, R6 and R7, R8 across overlapping sections of a main divider R2-R4, and the resistors are so valued that the voltages across R6, R7 are equal. When the triangular signal E becomes increasingly positive, current passes first through diode G8 and then through G7 as the diode bias voltages from the voltage dividers are exceeded. Similarly as the triangular signal E becomes negative first G9 and then G10 conducts. Because of resistors R7, R6, the current in diodes G8, G9 will be less than in G7, G10 when conducting, and so the current-and thus the voltage drop-in R1 will be small for low values of signal E and large for high values, and consequently the triangular signal will be rounded to produce the substantially sinusoidal signal F. Temperature compensation for diodes G7-G10 is provided by diodes G1-G6 or by temperature-sensitive resistors.
Patent GB-1173972-A (GB)
Title: Counter Drive for Recording Instruments
IPC: G01P1/04
Filed: 1967-10-20
Abstract: 1,173,972. Speedometer and odometer drives. KIENZLE APPARATE G.m.b.H. Oct. 20, 1967 [Nov. 8, 1966], No.47849/67. Heading G1K. [Also in Divisions F2 and G4] A drive to a counter comprises a worm-shaft 18 carrying a worm 20 meshing a helicol gearwheel 23 on a shaft 21 carrying a toothed wheel 27 which meshes a counter toothed wheel 16, the shaft 21 being of flexible plastics material. The shaft 21 is supported in a deformed state in slots 30, 31 in legs 29, 32 of a bearing bracket 26 and in a slot 25 in a side wall 3 of the mechanism. The worm 20 is mounted in a bearing body 22 which is rotatably mounted on shaft 21 between the legs 29, 32 of bracket 26.
Patent GB-1525498-A (GB)
Title: Receiver for binary pulse signals
IPC: H04B3/04
Filed: 1975-11-24
Abstract: 1525498 Binary pulse receiver PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 24 Nov 1975 [27 Nov 1974] 48191/75 Headings H3T and H4P A receiver in a binary pulse transmission system comprises an input circuit (2, Fig. 1, not shown) from which base band binary signals are derived at a relatively low output impedance, a circuit (9) connected to the input circuit to automatically correct disturbances in the D.C. level of the binary signals caused during transmission and a pulse regenerator (10) having a relatively high input impedance to which the correction circuit (9) and a reference source (12) are connected. The correction circuit (9) is characterized by having two parallel branches 15, 16 connected at their inputs to the input circuit and at their outputs to the regenerator, the first branch 15 including a series capacitor 17 and the second including a detector 18 to derive a threshold signal from the peak values of the binary signals and a comparator 19 generating a binary decision signal in response to both the threshold signal and the binary signal and coupled via a resistor 20 to the ouput of the second branch and the time constant of the resistor 20 and capacitor 17 being much larger than the duration of an element in the binary signal. The comparator may be a differential amplifier 19, or it may comprise a differential amplifier and a difference circuit (23, Fig. 5, not shown) in which case the second input of the amplifier is connected to a reference potential (earth). Alternatively a summing circuit may be used (32, Fig. 8, not shown). A double ended threshold circuit (33) may be connected between the input and the summer and may consist of diodes (35, 36) in parallel or Zener diodes in series (not shown). The detector may comprise two diodes (21, 22, Fig. 5, not shown) in parallel with a common resistive load shunted by a capacitor such that the time constant is larger than the duration of a pulse element, or may have two separate detectors 21, 22 with their own loads 29, 30 and capacitors 27, 28 and a common resistor 31 to earth.
Patent GB-1294705-A (GB)
Title: Method of fabricating hollow turbine, compressor or fan blades
Inventor: KING JULIAN PEARRE JR
IPC: F01D5/28
Filed: 1970-10-12
Abstract: 1294705 Making aerofoil section blades; welding by pressure NORTH AMERICAN ROCKWELL CORP 12 Oct 1970 [5 Jan 1970] 48441/70 Headings B3A and B3R In making a metal turbine, compressor or fan blade an assembly comprising a plurality of rib elements and a spacer or spacers of a material different from that of the rib elements between adjacent rib elements and two cover plates between which the rib elements and spacers are sandwiched is disposed between dies in a cavity, apart from recesses to receive excess metal, having the shape and size of the blade to be formed, the assembly having a volume equal to or greater than the volume of the cavity apart from the recesses and the assembly being heated and pressure applied thereto to effect diffusion sounding between the cover plates and rib elements, the spacers being subsequently removed to provide a lightening hole or holes. A turbine, compressor or fan blade is formed by arranging a lower cover plate 38 in a cavity 32 in a female die 30, placing rib elements 40 on the plate 38 with leading and trailing edge elements 44, 46, placing a rod like spacer element 42 of circular, square &c. section between each pair of rib elements and placing an upper cover plate 48 on the rib elements. A fin 24 is provided in a recess in the die 30 to engage the lower cover plate 38, a fin 26 is provided to engage plate 48 and base 12 and flange members 14, 16 are also arranged to contact the end of the blade assembly. A male die 28 is then located in the cavity 32 of the female die, the assembly is enclosed by a thin walled retort 50, a vacuum pump is connected to a conduit 52 in the retort and the assembly is heated while under pressure. If the plates and rib elements are of titanium and the spacers of steel heating at 1600 F. under 2000 p.s.i. for several hours is employed. The blade is cooled and the steel spacers are leached by acid from the blade leaving lightening holes, the titanium surface being chemically etched to remove steel interaction products. The plates and rib elements may be of stainless steel or columbium and a thin interleaf or eutectic former may be employed.
Patent GB-1369805-A (GB)
Title: Magnetic recording and reproducing arrangements
IPC: G11B21/02
Filed: 1971-10-13
Abstract: 1369805 Magnetic sheet recorder RICOH KK 13 Oct 1971 [5 Nov 1970] 48755/73 Divided out of 1369802 Heading G5R The description is identical to part of that in the parent Specification 1,369,802, but the claims relate to the feature that the mechanism which has to be actuated so that the turntable brakes are applied when the head returns to its radially outermost position, can be actuated in any one of three ways. The mechanism in question is a spring 216, Figs. 15, 19, 20, mounted on a lever 212, which when actuated is moved to the position shown in Figs. 19, 20, in which position it is above the actuator 217a of a switch 217. In this position, when the head returns to its outermost position, the end 224a, Fig. 19, of a stop lever 224 runs along the spring and actuates the switch, which, in turn, causes the brakes to be applied and the drive to be removed. The lever 212 can be moved to its operative position in one of three ways; either a "reverse feed" key can be depressed which presses on the bottom left-hand projection of a slide 192, Fig. 15; or a "quick feed" key can be depressed which presses on the right-hand projection of the slide 192; or if the head reaches its innermost position and is automatically returned to its outermost position then the mechanism for effecting this also moves the end 53c of an actuating lever 53 so that as it rotates with the turntable it strikes the lever 212 via a spring 213.
Patent GB-487557-A (GB)
Abstract: 487,557. Thermal switches. BRITISH THOMSON-HOUSTON CO., Ltd. Aug. 25, 1937, No. 23344. Convention date, Aug. 27, 1936. [Class 38 (v)] The instrument is a temperature-controlling device in which an electric circuit is made and broken by the action of a thermostatic element. It comprises an elongated casing 14 which passes into the interior 11 of an electrically heated oven through the insulating layer 13 surrounding it, and a setting knob 49 exterior to the oven. The upper end of the bimetallic thermostatic element 19 arranged in two parts 19a, 19b as described in Specification 487,542 which is inside the casing, carries a bridging bar 26 insulated from it, which forms a switch 24 by short-circuiting two contacts 25 on metal strips 31. These strips are carried on an insulating block 29, rigidly attached to the casing, and terminals 32 on these strips allow connection to an electric circuit to be made as desired. Snap action of the switch is obtained by a spring 33 carried between knife edges as described in Specification 222,535, [Class 38 (v)], one of which is formed from the top of the thermostatic element. At the lower end the thermostatic element is fixed to a support 20 which may rotate about a pin 21 attached to the casing, and the position of the element and therefore of the temperature required to operate the switch is controlled by a spindle 40 which when rotated moves in a direction parallel to its axis. The upper end of the spindle carries a graduated setting knob 49, while the axial movement of the spindle is caused by its bearing a threaded portion 48 which engages. in a member 38 attached to the casing. A partition 47 divides the casing into two parts, the upper section which contains the switch, practically forming an enclosed space which is surrounded by the insulating material of the oven, while the lower portion, which is in the oven contains the main portion of the thermostatic element made more amenable to the temperature of the oven by the removal of parts of the casing.
Patent GB-1422678-A (GB)
Title: Rotary piston machine
IPC: F04C18/18
Filed: 1973-10-19
Abstract: 1422678 Rotary piston machines J BOES 19 Oct 1973 [19 Oct 1972] 48786/73 Heading F1F An intermittent abutment machine comprises two coaxial inner and outer shafts carrying relatively oscillating pistons and a gear train which includes two intermeshing quasi-elliptical gearwheels and a differential gear mechanism to produce these relative oscillations and to transmit power to or from the machine. As described the machine is an I.C. engine and a quasi-elliptical gear 12 is keyed to the outer shaft 2 and meshes with a similar elliptical gear 13 keyed to a layshaft 14. A circular gear 15 is keyed to the inner shaft 1 and meshes with a similar gear-wheel 16 keyed to the auxiliary shaft 14. A gear-wheel 17 of the differential mechanism is fixed to the outer shaft 2 and a second gear-wheel 18 of the mechanism is fixed to the inner shaft 1. A carrier pinion 19 of the mechanism carrying planetary pinions meshing with the gears 17, 18 drives an output shaft 21 of the engine via a pinion 20. A pair of diametrically opposed sector shaped blades 3, (4) are fixed to the inner shaft 1 by way of flange 7 which forms one end wall of an annular housing and rotates with the shaft 1. A similar pair of pistons 5, (6) are fixed to a similar flange 8 which forms a second end wall of the housing end rotates with the outer shaft 2. The pistons are hollow and their interiors communicate with the exterior of the housing via openings 7, 91 in the associated flange for ingress of air for cooling and may also be in communication with the interior of a hollow shaft carrying the piston and having a cooling fluid inlet. The axial extending wall of the housing is constituted by a cylindrical part 10 with peripheral groove for cooling purposes. Inlet and exhaust ports in the housing have adjustable slide valves to adjust the dimensions of the ports in accordance with operating conditions.
Patent GB-1060729-A (GB)
Title: Improvements in and relating to bandages and dressings
Inventor: SEYMOUR DONALD EDWIN
IPC: D03D15/00
Filed: 1963-12-11
Abstract: A stretch fabric for bandages is woven from warp and/or weft of cotton or rayon staple yarns alternating with yarns consisting of cotton or rayon roving spun round a core of polyurethane monofil. Some high twist yarns of cotton or high tenacity rayon may also be included.  When the fabric has only one-way stretch, the yarns in the other direction are soft-spun cotton or rayon staple.ALSO:A one or two-way stretch fabric for bandages is woven from warp and/or weft of cotton or rayon yarns alternating with yarns consisting of cotton or rayon fibres spun round a core of polyurethane elastomer monofil. Some high-twist yarns of cotton or rayon may also be included.  When the fabric has only one-way stretch, the yarns in the other direction are soft-spun cotton or rayon.
Patent GB-1224819-A (GB)
Title: Method for preparing pressure sensitive transfer media
IPC: B41J31/00
Filed: 1968-10-16
Abstract: 1,224,819. Coloured polymer compositions. INTERNATIONAL BUSINESS MACHINES CORP. 16 Oct., 1968 [30 Nov., 1967], No. 49071/68. Headings C3P and C3R. [Also in Division D2] In making the transfer layer of a pressuresensitive transfer element (see Division D2), the following compositions are used:-(a) vinyl acetate/vinyl chloride copolymer, an ink composition consisting of a black pigment in rapeseed oil, and methylene chloride as solvent (Example 1); (b) as in (a) but the solvent is a mixture of methylene chloride and ethyl acetate (Example II); (c) alcohol-soluble polyamide, wood flour, a dyestuff, carnauba wax, an ink composition consisting of a black pigment, nigrosine oleate, methyl violet base and mixed fatty acid esters, and, as solvent, a mixture of ethanol and xylene (Example III); alcoholsoluble nylon, wood flour, an ink composition containing nigrosine oleate, methyl violet base, two black pigments and polyethylene glycol dilaurate, and ethanol (Example IV).
Patent GB-1062149-A (GB)
Title: A trailer-type spreader for particulate material
IPC: A01C17/00
Filed: 1965-11-18
Abstract: 1,062,149. Fertilizer spreaders. WILLMAR MANUFACTURING. Nov. 18, 1965 [Sept. 3, 1965], No. 49077/65. Heading A1D. A machine for spreading powdered material comprises a hopper 10 provided with an endless belt which feeds material to two discs 26, provided with adjustable blades, and driven from a shaft 28 connected to a tractor power shaft the belt being driven from an axle 14 which supports landwheels 13 and is mounted on the frame 11 so as to be slidably adjustable along the frame. The drive from the axle 14 to the belt is by chain and sprocket gearing which is controlled by a lever 44 which raises or lowers an endless chain 46 from a sprocket mounted on a shaft 37.
Patent GB-1108238-A (GB)
Title: A multi-curved building structure
IPC: E04B1/32
Filed: 1965-11-22
Abstract: 1,108,238. Metallic fabrics. H. T. PRIOR. 15 Nov., 1966 [22 Nov., 1965: 29 Nov., 1965], Nos. 49476/65 and 50561/65. Heading D1K. [Also in Division E1] A grid structure, which may be curved in more than one plane, has a pair of sets of members 3, 3, 4, 4, each set running in the same direction transversely to the other set, the members 6, 7, of at least one set 3 being bent out of the general plane of the grid to allow bending of the grid in one direction without bending of the other set 4. Preferably both sets are bent about lines, such as 8. 9, 10 to an angular formation between the common areas 5 forming the plane of the grid. Two of the grids may be secured together either at areas 5 or bend lines 8. The grids may be integral or built-up of metal or plastic and may be used for reinforcement in concrete multi-curved structures.
Patent GB-1464408-A (GB)
Title: Self-balancing instrument
IPC: G01R17/02
Filed: 1974-11-15
Abstract: 1464408 Measuring voltage YOKOGAWA ELECTRIC WORKS Ltd 15 Nov 1974 [12 March 1974] 49481/74 Heading G1U For measuring a voltage Ex, a switching arrangement OSC, WR converts the error voltage E s '-E x  to an A.C. signal which via amplifiers Al, A2 and switched attenuator ATT2 supplies the control winding of a balance motor BM, which drives the brush of a variable resistor RS2 and the response of which to low signals is improved by injecting white noise into its control signal. The position of the brush defines a reference voltage output E s  from a pre-set potentiometer RS3 which output is applied via a phase compensator PC to a second switched ATT1 (ganged to ATT2) which produces E s ' as its output. The product of the attenuation ratios of the attenuators ATT1 and ATT2 is arranged to be constant for the several switched positions ensuring a similar response to all measurement ranges. To provide a reduction in the "dead zone" of the motor BM and resistor RS2, by reducing static friction, a Zener diode generator HN is used to inject white noise into the voltage E s ', thus providing a small, low frequency vibration of the motor. The generator may be a Zener diode biased at the "knee" of its reverse characteristic, Fig. 3 (not shown), whose output is applied to the compensator output via a transistor amplifier TH. Alternatively, the Zener diode output is applied directly to the inverting input of a differential amplifier in the compensator, Fig. 2 (not shown). The phase compensator advances the phase of changes in the reference voltage, the amount of advance being set by the effective gain of the amplifier, varied by RP1, which variation does not affect the stability of the feedback and ensures constant and simple requirements for the design of the servosystem network.
Patent GB-1331287-A (GB)
Title: Determination of the ratio of two dc currents
IPC: G01R1/28
Filed: 1970-10-19
Abstract: 1331287 Measuring current and resistance TAKEDA RIKEN INDUSTRY CO LTD 19 Oct 1970 [17 Oct 1969] 49572/70 Heading G1U [Also in Division G4] The ratio of two direct currents is determined in the following three stages:- (a) One of the currents Io, Fig.1 is applied by a switch W1 to an input winding Ni on a core C, the resulting net flux in the core is detected by a circuit comprising pick-up windings Ndl, Nd2, a coupling transformer M, an oscillator O1 and a demodulator D, the signal representing the net flux in the core is passed via a high gain amplifier Ao and a scale factor applying device B, to a second winding Nc on the core in such a way that the flux produced by this winding opposes that produced by the input current Io through winding Ni, and the loop is such that when a stable condition is reached the net flux in the core is substantially zero. If E1 is the stable output voltage from the amplifier then Io R1 Ni = Nc E1. (b) The output voltage E1 from the high gain amplifier, when the loop is stable, is measured by a digital voltmeter V and set on the device B so that this device now introduces a scale factor of E1 into the loop, the switch W1 is actuated to apply the second current Ix to the winding Ni and the loop is allowed to attain a second stable condition. The output voltage E2 from the high gain amplifier Ao in the second stable condition is measured and it can be shown that E2 = Ix/Io. (c) The digits above the three lowest order digits of E2 are set in a device F which causes the current Io to be applied to appropriate taps of a winding Nx in such a way that the majority of the flux created by the current Ix applied to winding Ni, is now balanced by the current Io applied to winding Nx, the effective loop gain is increased by a factor of 1, 000 by actuating a switch W2 so that the feed-back is over a resistor R2 instead of a resistor R1, the loop is allowed to attain a third stable state, and the output voltage E3 from the amplifier Ao is measured. It can then be shown that this voltage represents the three lowest-order digits of the previous voltage E2, but referred to a scale which is 1,000 times (=R2/R1) more sensitive than for the original measurement of E2. Thus, stage (b) above provides a coarse measurement of the ratio of the two currents, and stage (c) provides a more accurate determination of the three lowest-order digits of the ratio. The currents Ix and Io may be made proportional to two resistances Rx and Ro by using appropriate potential sources see Fig. 2 (not shown).
Patent GB-1533711-A (GB)
Title: Moulding of ceramics articles
IPC: B28B13/06
Filed: 1975-12-04
Abstract: 1533711 Moulding clay CONTINENTAL CHINA (PTY) Ltd 4 Dec 1975 [8 Jan 1975] 49916/75 Heading B5A  Articles are moulded from clay by encapulating the clay in a moisture impervious foil readily conformable to the contours of the mould and pressing the encapsulated clay in the mould. Appropriate blanks of clay extruded from nozzle 3 are cut off from the extruded strands deposited on platform 7 and are stored on the inclined shoot 9. The blanks are transferred manually to the feeder shoot 10 and a feeder device 11 synchronizes delivery to the moulding press 15. As the blanks pass through the guide device 12 a ribbon 13 embraces the clay blank and the embraced blank passes into register with the dies of the press. The mould is closed, excess clay being squeezed out and the mould is then opened and the moulded article moves on the conveyer belt 19 where the foil is removed.
Patent GB-1363525-A (GB)
Title: Blower assembly
IPC: F04D25/06
Filed: 1971-10-29
Abstract: 1363525 Centrifugal blowers GES FUR ELEKTRISCHE GERATE mbH 29 Oct 1971 [31 Oct 1970 14 April 1971] 50399/71 Heading F1C [Also in Division H2] A lateral-duct blower 1 concentrically surrounding and driven by an electric motor 6, 7, has an impeller 5 having vanes 2 which pass over a lateral duct 19 formed in the housing 3, 4 so that a medium fed into the blower is drawn in one direction through the motor (between the stator 7 and rotor 6) and then in the opposite direction through a suction port 12 to the lateral-duct. The central disc 8 of the impeller 5 is driven by shaft 13 and has perforations 9 between vanes 10 forming an axial flow pre-compressor. Housing port 4 has a protective grid 18, and openings 16 between guide vanes 17 which co-operate with the axial flow blower. An exhaust port 15 is provided, generally adjacent the suction port 12. A sound absorbing liner 3', 4', may be provided on the inner surfaces of the housing and on the vanes 10. The impeller 5 and disc 8 may be formed as a single die cast unit or the disc may be a synthetic resin part pressed on a cast impeller, and the vanes 10 of disc 8 may be profiled so that the axial speed of the flow is the same at all radii. Two series connected lateral ducts (19, 19') Fig.6 (not shown) may be provided, a circular set of vanes (2, 2') passing over each duct.