baber/WOPTO huggingface dataset:
Patent GB-1255933-A (GB)
Title: Improvements in control systems for direct current electric motors
Inventor: MANNERS FRANK
IPC: H02M3/135
Filed: 1968-07-01
Abstract: 1,255,933. Control of D.C. motors. LANSING BAGNALL Ltd. 23 June, 1969 [1 July, 1968], No. 31386/68. Heading H2J. [Also in Division G3] A series motor 4 is supplied from battery 1 through thyristor 7 having a commutating arrangement comprising capacitor 22 coupled between rectifiers 7,21, which are triggered alternately, the charge on the capacitor being increased by the action of transformer 25. Triggering signals for the rectifiers 7, 21, are derived from an astable multivibrator, the passage of triggering pulses for the thyristor 7 being prevented when a reactor is saturated by coil 6 in series with the motor. The level of armature current to produce saturation is varied by adjusting the position of a permanent magnet. The trigger network for the rectifier 21 comprises a control transistor which is coupled to the trigger network for the rectifier 7. When the latter conducts, the control transistor also conducts, the next succeeding pulse to the thyristor 21 being prevented whereby the period of conduction of the thyristor 7 is maintained provided that the armature current remains below a predetermined level. Coils 13, 14, of reversing contactors 9, 10, are in parallel with the thyristor 7, so that, if the conduction period of the thyristor is prolonged, the current through the coils decays and the voltage across resistor 17 decreases. A signal is then developed to prevent the passage of triggering pulses to the thyristor 7.
Patent GB-795849-A (GB)
Title: Improvements relating to machines for bending curved shapes
IPC: B21D7/08
Filed: 1956-10-16
Abstract: 795,849. Curving. HAUSLER, C. Oct. 16, 1956 [Dec. 14, 1955], No. 31462/56. Class 83 (4). A machine for bending curved shapes comprising a driven template roll a, which is carried in stationary bearings and around which a workpiece x is bent, an adjustable urging roll b, which is associated with said template roll a and which is also driven, and two bending rolls c, d which are arranged on the feed and rear sides, respectively, of the set formed by the rolls a, b, said bending rolls c, d being carried in journal bearings f1, f2 having oblique guides e1, e2 oppositely inclined relative to the plane containing the axes of the rolls a, b, is characterized in that said journal bearings f1, f2 are connected by lever and linkage means h, k, m, o to a drive means under control of means p, operated by a sensing lever r extending towards the roll a to initiate the operation of the drive means j when the lever r is actuated at the beginning of a bending operation by the leading end of the workpiece x, which is being bent with a substantial co-operation of the feed-side bending roller c, said operation of the drive means j causing the lever and linkage means to retract the bending roller c from its original position and at the same time to extend the rear-side bending roller d, which had not participated in the bending operation until that time, to such an extent as to cause said roller d to exercise the bending pressure for bending the workpiece. The drive means j comprises an hydraulic motor and the control means p a valve. The bell-crank h from the bearing f pivots about a fixed pin i and the link o from the bearing f 2 pivots on a pin n1 on a slide n adjustable on the rocker m which pivots on a fixed pin m1 and is connected by the link k. to the bell-crank h.
Patent GB-1408961-A (GB)
Title: Process for the production of polybenz-1,3-oxazin-2,4-diones
IPC: C08G18/34
Filed: 1973-07-02
Abstract: 1408961 Polymers containing 1,3-oxazin-(2, 4)-dione groups BAYER AG 2 July 1973 [1 July 1972] 31470/73 Heading C3R Polymers containing 1,3-oxazin-(2,4)-dione groups having recurring units of formula are obtained by reacting arylene bis-carbamic acid diaryl esters of formula with bis-o-hydroxy aromatic dicarboxylic acid' esters of formula In the above formulae Ar is or where Ar<SP>III</SP> and Ar<SP>IV</SP> are aromatic radicals and X is a direct link or -O-, -S-, -SO 2 -, -CH 2 -, -CH(CH 3 )- or -CO-, Ar<SP>I</SP> is or where Ar<SP>V</SP> and Ar<SP>VI</SP> are aromatic radicals and Y is -O-, -S-, -SO 2 -, C(CH 3 ) 2 -, CH 2 -, Ar<SP>II</SP> is an aromatic radical and R is an aliphatic, araliphatic or aromatic radical. In examples polymers are obtained by reacting 4,4<SP>1</SP>-bis- (phenoxycarbonylamino)-diphenyl ether, 4,4<SP>1</SP>- bis - (phenoxycarbonylamino) - diphenyl methane and a mixture of 4,41-bis-(phenoxycarbonylamino) - diphenyl ether, 2,4<SP>1</SP> - bis - (phenoxycarbonylamino)-diphenyl ether and 1,5-bis- (phenoxycarbonylamino) - naphthalene, all with 4,41 - dihydroxy diphenyl - 3,31 - dicarboxylic acid diphenyl ester, and by reacting 4,4<SP>1</SP>- bis - (phenoxycarbonylamino) - diphenyl ether with 4,6-dihydroxy isophthalic acid phenyl ester. Uses.-Shaped articles, films, filaments and coatings having good resistance to high temperatures.
Patent GB-767626-A (GB)
Title: Improvements in and relating to the erection of pit props
IPC: E21D15/58
Filed: 1954-11-01
Abstract: 767,626. Reciprocating pumps; piston extrusion apparatus. STAMICARBON N. V. Nov. 1, 1954 [Nov. 2, 1953], No. 31538/54. Classes 102(1) and 102(2). [Also in Group X] A reciprocating pump, Fig. 4, for supplying pressure fluid to an apparatus for pre-loading pit props (see Group X), comprises a plunger 28 which can be reciprocated in a compartment 24<SP>1</SP> by means of a lever 30 pivoted at 29, to draw the fluid through a suction valve 32 from a reservoir 33 and to deliver the fluid through a pressure valve into a conduit 35 which leads to the pre-loading apparatus. In another embodiment the fluid which operates the pre-loading apparatus is supplied from a device wherein, firstly a plunger 25, Fig. 3b, is screwed into a casing 26 to displace fluid therefrom for initially setting the pre-loading apparatus and secondly a small diameter plunger 27 is screwed in within the plunger 25 to displace fluid at a high pressure to pre-load the prop.
Patent GB-1059571-A (GB)
Title: Improvements in or relating to electrical power supply apparatus
IPC: G05F1/573
Filed: 1962-08-16
Abstract: 1,059,571. Automatic voltage control. FARNELL INSTRUMENTS Ltd., and R. KIDD. Aug. 16, 1963 [Aug. 16, 1962], No.31567/62. Heading G3R. A voltage regulator includes an overload protection circuit which operates in two stages. As shown, a voltage regulator comprises an A. C. supply source supplying output terminals 11 over a rectifier MR1 and a power transistor VT7, a differential amplifier 12 for comparing the output voltage with a reference voltage across a Zener diode Z2, transistors VT3, VT6 controlling the impedance of transistor VT7 in dependence upon the error signal from the amplifier 12, and an overload protection circuit 13 including transistors VT4, VT5 and Zener diode Z4. Under normal operating conditions, transistor VT5 is non-conductive and the circuit operates to maintain a constant output voltage at terminals 11; at a predetermined value of load current, however, transistor VT5 conducts, by virtue of a decreased current flow through transistor VT3, whereby transistors VT6 and VT7 are controlled to prevent further increase of current flow through transistor VT7. If the load across output terminals then increases further, the output voltage decreases and the voltage across transistor VT7 increases until Zener diode Z4 conducts, causing VT4 to conduct whereby transistor VT7 is controlled over transistors VT5 and VT6 to pass still less current. The overload control action is thus effected in two stages, i.e. by the conduction firstly of transistor VT5 and secondly by the conduction of Zener diode Z4. A modification using fewer transistors is described with reference to Fig. 2 (not shown). It is stated that a thermionic valve may replace the transistor VT7.
Patent GB-1514316-A (GB)
Title: Conjugate filaments comprising polycarbonates
IPC: D04H1/54
Filed: 1975-07-29
Abstract: 1514316 Non-woven fabric; synthetic paper JAPAN VILENE CO Ltd 29 July 1975 [30 July 1974 20 March 1975 29 May 1975] 31599/75 Headings D1R and D2B [Also in Divisions B5 and C3] A paper or non-woven fibrous fabric sheet comprises conjugate filaments (F) of improved crazing- and oil-resistance, which comprise by wt. 50-95% filament-forming polycarbonate (A), the balance being filament-forming polypropylene (B), (A) forming a continuous matrix, and (B) being dispersed therein as a multitude of ultrafine individual fibres extending for a substantial distance lengthwise. (A) may be derived from bisphenol A. The non-woven fabric may have Gurley porosity 500-50,000 seconds per 100cc and may be made by: forming a web of filaments (F) of average diameter <15Ám; impregnating with a liquid mixture comprising by wt. 5-90% (a) a solvent for #1 component (A) or (B) which swells the component at elevated temperature but not at 18‹-25‹C, the balance being (b) a non-solvent for both (A) and (B), (b) having a higher b.p. than (a); and pressing at a temperature at which (a) dissolves or swells the component, so as to bond the filaments together. (a) may be tetrahydrofuran, CH 2 Cl 2 , C 2 H 2 Cl 4  and/or CHCl=CCl 2 , and (b) may be H 2 O, CH 3 OH, C 2 H 5 OH, 2-ethoxyethyl acetate, and/or nheptane. The pressing may be performed by calendering at 30-300 kg/cm and 120-160‹C. Use insulation layer for electric cables.
Patent GB-798448-A (GB)
Title: Cold-sealing water-soluble thermoplastic cellulose ether composition
IPC: C08L1/28
Filed: 1956-10-17
Abstract: A thermoplastic composition comprises (1) 4-26 per cent by weight of a water-soluble alkyl hydroxyalkyl cellulose ether in which the number of carbon atoms in the alkyl group is 1-3 and the number of carbon atoms in the hydroxyalkyl group is 2 or 3; (2) 64-91 per cent by weight of a solvent for said ether above 100 DEG  C.; and (3) 4-21 per cent by weight of a solvent for said ether below 50 DEG  C. Specified cellulose ethers are methyl hydroxyethyl cellulose and methyl hydroxypropyl cellulose.  The specified hot solvent is propylene glycol, and the specified cold solvents are water, ethylene carbonate, propylene carbonate and a 50 per cent aqueous solution of gluconic acid.  A one-stage process for producing methyl hydroxypropyl or methyl hydroxyethyl cellulose is described in which alkali cellulose is treated simultaneously with methyl chloride and propylene oxide or ethylene oxide.  Examples are given.
Patent GB-1104132-A (GB)
Title: Improvements in or relating to limiter circuits
Inventor: SIMMONDS ERNEST SIDNEY
IPC: H03G11/00
Filed: 1964-08-04
Abstract: 1,104,132. Limiters; transistor pulse shaping circuits. TELEPHONE MANUFACTURING CO. Ltd. 22 July, 1965 [4 Aug., 1964], No. 31685/64. Heading H3T. An arrangement which, in response to a sinusoidal input which may vary in amplitude suddenly and over a wide range, will produce a substantially square wave output of constant mark to space ratio and amplitude and which is symmetrical about a constant level, comprises a linear amplifier stage VT1, Fig. 1, and two transistor limiters VT2, VT3 respectively direct-coupled in cascade. A Zener diode Z1 in the emitter circuit of transistor VT3 provides close control of the operating point, while capacitors connectible to various tapping points on the resistor chains R4 to R8 and R9 to R12 in the emitter circuits of transistor VT2, VT1 respectively enable selection of gain and limiting level appropriate to the range of input variation. A modified circuit, Fig. 2, utilizes diode clippers MR1, MR2 in the collector circuit of the first transistor VT1, and a diode MR3 connected between emitter and base of the last stage VT14 provides for equal loading of the collector circuit of the preceding stage during positive and negative half cycles, so that the latter does not bottom and can be capacity coupled to the prior stage.
Patent GB-1063167-A (GB)
Title: Improvements in or relating to lining materials for buildings
Inventor: BRANT JOHN FRANCIS
IPC: E04B1/82
Filed: 1964-08-05
Abstract: 1,063,167. Laminates. BURGESS PRODUCTS CO. Ltd. Aug. 4, 1965 [Aug. 5, 1964], No. 31757/64. Heading B5N. A composite lining material comprises a backing layer 10 of sound-absorbent material and a facing layer 11 of foam rubber or foam plastic presenting outwardly a surface formed all over with protuberances spaced at their peaks by a distance approximately equal to their height. As described a facing layer 11 of expanded polyurethane is secured by wire clips to a backing layer 10 of glass wool, slag wool, cotton wool, or rock wool, preferably a 4-inch-thick layer of the latter compressed to 3¥ inches and having a density of 5 lb/cu<SP>3</SP>.The material, preferably in the form of a panel, is strengthened by a oneinch square wire mesh 12 and spaced from, e.g. a wall 13 by preferably sound-absorbing spacer members. The material, or panels made therefrom, is used to line an anechoic chamber. The protuberances are arranged in egg-crate pattern or are staggered in adjacent rows.
Patent GB-997965-A (GB)
Title: Semiconductive tunnel-effect devices
IPC: H01L21/24
Filed: 1961-09-05
Abstract: 997,965. Semi-conductor devices. WESTERN ELECTRIC CO. Inc. Sept. 5, 1961 [Sept. 6, 1960], No. 31852/61. Heading H1K. In a tunnel effect device with an improved peak-valley current ratio degenerate P and N- type zones are separated by a thin layer of a material with an energy gap at least 3 electron volts less than that of either the P or the N-type zone. The effective electron mass in the layer material which may be intrinsic or N or P-type should be as small as possible. In addition, to avoid high concentrations of recombination centres at the interfaces between the layer and the zones, the lattice constants and orientation of adjoining layers should match sufficiently to produce not more than one dislocation per 20 atoms at either interface, e.g. lattice constants should match to within 5% and the crystallographic orientations to within 3 degrees. Suitable materials for the thin layer, which is preferably 10-300 Š thick, are indium antimonide in association with P and N zones of cadmium telluride; indium arsenide or mercury selenide with cadmium selenide; and mercury telluride with cadmium telluride. The layer may be produced by vapour depositing the low energy gap material on the end of a block of degenerate P or N-type high-energy gap material, pressing the block against a block of opposite conductivity type and heating to fuse the blocks together. Alternatively the P and N-type blocks are closely spaced in a melt of the layer material which is drawn up between them by capillary attraction. The assembly is then rapidly cooled with the blocks pressed together to squeeze out excess melt to reduce the layer thickness to the desired value.
Patent GB-878943-A (GB)
Title: Improvements in typographical linecasting machines
IPC: B41B27/10
Filed: 1957-10-11
Abstract: 878,943. Strip-perforating machines; type-bar-machinery machines. ASTIER, P. J. B. Oct. 11, 1957 [Oct. 17, 1956; Jan. 15, 1957], No. 31874/57. Class 100(3) A typographical linecasting. machine of the kind having a keyboard, the operation of which selects matrices and causes the assembly of a line of the matrices from which a cast of a line of type is made, has means operated by the keyboard for perforating a strip in a predetermined code. Each key 417, Fig. 1, of a conventional line-casting machine keyboard, raises by notches B one of a series of counterweights A having code notches C. When a counterweight A is raised, one or more of a series of bars 1 is allowed by one or more of the notches C to move under the action of springs 2 in a motion oscillatory about pivots O1, O4. This movement of any one bar causes an extension 7 thereon to swing a latch 11 so as to release one 16 of four rollers 14-17 on a segment gear 18, while at the same time moving forward roller 14 so as to rotate the segment gear, a grand segment (quadrant) of which is caused to engage a continuously rotating gear 19 so that the segment 18 rotates through a quarter revolution, roller 15 acting on a bar 30 to operate one of the punches and perforate the tape P, the bar 30 also actuating the tape feed device 36, 35a. The bar 1 also swings a flap 20 which through a link 20a swings a flap 27 into the path of the roller 14, which acts on the flap 27 during the latter part of the motion to restore the flap 20. The bars 1 are normally prevented from moving by the flap 20, which is latched by a member 25, which is released when an electromagnet El is energized on depression of any key. Depression of any key causes its counterweight A to act on a flap 38, Fig. 1 and 7, having an adjustable counterweight 40, so as to close contacts 43, 44. Contacts 45, 46 being normally closed, the magnet El is energized (circuit from supply terminal A 1 to contacts 44, 45, 46, magnet E1 and supply terminal B1) to operate the punches, and an electro-magnetic clutch 53 is energized, whereupon a continuously rotating worm 55 rotates a ratchet 52 counter-clockwise. Movement of the bars 1 acts through a connection 47a to swing a lever 47 clockwise and open contacts 45, 46, de-energizing the magnet. A pawl 50 then engages a tooth of the ratchet. When the bars 1 are restored by the flap 23 (which is then re-locked by the latch 25), the lever 47 is returned by a spring 49, first slowly as the ratchet tooth moves the pawl and then rapidly as a fixed pin 56 acts on a cam surface 57 to disengage the pawl, so as to re-close the contacts 45, 46. If the key is still depressed, the cycle is repeated, if not the clutch 53 is de-energized. Specification 878,944 is referred to.
Patent GB-155707-A (GB)
Title: Improved fire grate
IPC: F23H13/02
Filed: 1919-12-19
Abstract: 155,707. ClappÚ, M. B. Dec. 19, 1919. Grates.-In domestic fire-grates, the bars or the like are formed so as to provide a hollow space in the centre of the vertical or substantially vertical radiating-surface of the fuel, in which space air passing to the fire is heated, and a higher temperature of the radiating- surface is obtained. In the grate shown in Figs. 2 and 3, the front bars 1, 2, 3 are formed with an inwardly-projecting loop 4, leaving a hollow space in the form of a truncated cone surrounded by the fuel. The top of this space may be covered by bars which may carry more fuel or support a kettle &c. Fig. 4 shows a wire framework which stands in an ordinary grate and being surrounded by the fuel forms a similar hollow space in the front radiating-surface; a similar structure may be formed of cast or wrought-iron frames. Another form of grate is described in which a series of superposed inclined grates in the form of shelves are arranged round the back and sides of the fire space, leaving a hollow space in the centre.
Patent GB-1532538-A (GB)
Title: Analogue to digital conversion systems
IPC: H03M1/00
Filed: 1976-07-31
Abstract: 1532538 Analogue-to-digital conversion MARCONI CO Ltd 6 April 1977 [31 July 1976] 32023/76 Heading H3H A D.C. voltage at terminal 1 is digitized to high accuracy (e.g. 19-bit word with Œ 5 bits error) using a lower accuracy A-to-D converter 2 (e.g. 8 bits) and an accumulating loop 3-4-5 (e.g. for 2048 samples). An A.C. ripple may be applied at terminal 10 to improve error compensation.
Patent GB-179572-A (GB)
Title: Gradually variable power transmission gear or drive
IPC: F16H9/24
Filed: 1920-11-12
Abstract: 179,572. Tygard, J. W., and Tygard, E. A. Nov. 12, 1920. Expanding wheel gearing has concentric tread members 8, 9, Figs. 1 and 2, of different diameters which, in changing speed, are moved axially in succession into operative position forming a cage-like wheel, each of the tread members forming a single tooth. The members 8, 9 are in the form of separate bolts which slide in a wheel boss 2 and may engage a chain 12 when thrust into a gap 11<b> in which the chain runs. The chain gears also with a wheel 12<a> on a shaft 22, and suitable tensioning-means are provided. The bolts 8 have swells or runners 8a which are guided in one or other of two annular tracks 16, 17 in a fixed annular boss or bracket 5. Change of speed is effected by shifting the runners 8<a> from one of these tracks to the other. This is done by a switch or shifter 25, Fig. 3, supported upon the spindle of a worm 30, which turns in the thickness of the boss 5 in a portion of the arc in which the chain is clear of the wheel. The bolts 9 are adapted to be held in three positions by three tracks 20, 19, 18 corresponding to lowspeed, neutral, and reversed driving respectively. In the neutral and reversed driving positions the chain 12 slips over the smooth base 10 of the gap 11<b>. In the reverse-gear position shown in Fig. 2, the left-hand ends of the bolts 9 serve as teeth meshing with a toothed gear 21. This twostep shifting of the bolts 9 is done by a pair of ccupled shifters 26, 27, Fig. 4, operated also by the worm 30, which is controlled by a threaded rod 31. More than two speeds may be obtained bv arranging the bolts to move together in radially-set groups, the ends of the bolts being in stepped formation.
Patent GB-520967-A (GB)
Title: Improvements in or relating to the re-dressing or re-laundering of fabrics
IPC: D06M15/15
Filed: 1938-11-04
Abstract: 520,967. Proofing fabrics etc.; sizes; emulsions; washing textiles. EMMINS, H. W. Nov. 4, 1938, No. 32057. [Class 140] [Also in Groups, III, IV and V] Fabrics such as household linen, furnishing fabrics and wearing apparel are rendered temporarily stain-resisting by .the use in the relaundering or re-dressing process of an aqueous dispersion in liquid, paste or jelly form comprising 5-20 per cent. of soft paraffin wax (m.p. 45-47‹C.) or a vegetable wax, 2-6 per cent. of an aluminium salt and 1-5 per cent. of a mixture of gelatine and vegetable gum. Up to 5 per cent. of acetic acid may be added. The aluminium salt may be the acetate or sulphate, and the gum may be gum arabic, gum acacia or gum tragacanth. The diluted dispersion may be added to the last rinsing, or starch bath. Examples are given of the preparations of dispersions from aluminium acetate with acetic acid and aluminium sulphate with and without acetic acid, together with paraffin or Japan wax, gelatine and a small amount of gum. Specifications 391,313, 394,816 and 489,895, [Group III], are referred to.
Patent GB-268696-A (GB)
Title: Improvements in motor vehicles
IPC: B60V1/00
Filed: 1926-12-18
Abstract: 268,696. Nicin, V. Dec. 18, 1926. Slipping of wheels, and overturning, preventing.-The adhesion of the road wheels of a motor vehicle is varied by altering the air-pressure beneath the vehicle by means of a compressor or exhauster. By reducing the air-pressure, slipping of the wheels due to. slippery road surface or excessive driving or braking torque, and alsooverturning of the vehicle on corners, is prevented, and by increasing the air-pressure the vehicle may be prevented from settling into soft ground. A four-walled compartment a, b is mounted on and beneath the vehicle, the walls being hinged to fold up when the compartment is not required. The side and lower edges of the walls make air-tight contact with each other and with the ground by means of rubber &c. strips g and the walls are raised by cables such as l, the front and rear walls being connected by a link m. The compartment is connected by a pipe D and valve E to a reservoir C, the air in which is maintained at a reduced or increased pressure by an exhauster or compressor A driven from the vehicle.