baber/WOPTO huggingface dataset:
Patent GB-715428-A (GB)
Title: Improvements in apparatus for converting direct current into alternating current
IPC: H02M7/51
Filed: 1952-07-21
Abstract: 715,428. Converting. HEWITTTC SOC, AR.L. July 21, 1952 [Oct. 29, 1951], No. 18388/52. Class 38(2) The output frequency of a single-phase mercury arc inverter having main anodes 30, 31 is determined by a self-exciting parallel-type pilot inverter, comprising subsidiary anodes 2, 3, the common cathode 1 and self-energized grids, which energizes the grids associated with the main anodes. All the electrodes may be enclosed in one envelope. Closing switch 15 initiates operation by energizing and moving starting electrode 16 whereby a cathode hot spot is created and maintained by exciter anode 17. Consequent opening of switch p, q, r cuts out the starting electrode 16 and develops a voltage pulse in transformer winding 6 which, transmitted to winding 5 and through capacitor 12 and resistor 24 to the grid associated with anode 3, causes this to fire. Subsequently anode 2 fires and anode 3 is quenched by commutating condenser 8, and these two anodes continue to fire alternately in the known manner of an inverter at a frequency determined by the values of inductor 10, winding 4, resistors 9, 13, 14 and capacitors 8, 11, 12. The load on this inverter comprises the pulses developed in transformer 25, 26 and transmitted to the grids associated with the main anodes 30, 31, modified by the biasing direct voltage developed by rectifier 27, When switch 36 is closed a load connected to transformer 39 which is energized through capacitor 37, 38 from auto-transformers 34 to which anodes 30, 31 are connected, is therefore supplied with A.C. at the frequency of operation of the pilot inverter. The frequency is not altered by a change in the load, for the loading of the pilot inverter remain constant. In a modification, frequency varations due to changes in inductance of winding 4 with variations of the input direct voltage, are offset by changes in the resistance of lamps or other voltage variable resistors connected in series with resistor 9. Frequency stability is improved by provision of an intermediate pair of converter anodes with associated grids connected through high valve resistors to the grids of the pilot inverter, pulses for the main anode grids being derived from transformers with primary windings connected to the intermediate anodes. The main anodes may be housed in a separate envelope from that enclosing the pilot and intermediate anodes, Fig. 3 (not shown).
Patent GB-1375235-A (GB)
IPC: C08F10/14
Filed: 1972-04-20
Abstract: 1375235 Bulk polymerization of 4-methylpentene-1 STAMICARBON NV 20 April 1972 [28 April 1971] 18431/72 Heading C3P 4-Methyl-pentene-1 is polymerized in the liquid monomer in the presence of a Zeigler catalyst and of hydrogen in an amount sufficient to provide a molar ratio of total hydrogen used to the transition metal compound in the said catalyst of at least 10. The process may be carried out at atmospheric pressure in a flask or under a few atmospheres pressure in an autoclave. In the examples the catalyst is violet titanium trichloride mixed with diethylaluminium chloride.
Patent GB-120998-A (GB)
Title: Improvements in Compressing and Exhausting Apparatus.
Inventor: HUXLEY MAURICE FRANCIS
IPC: F04B49/24
Filed: 1917-12-13
Abstract: 120,998. Huxley, M. F. Dec. 13, 1917. Regulating and controlling compression and exhaustion.-A pump for maintaining a predetermined pressure in a receiver is provided with a check valve controlled by a piston or diaphragm which is constantly under the opposing action of a spring, the atmosphere, or both, on one side, and the pressure existing above the pump piston on the other side, so that when the receiver pressure rises above a certain degree, the valve is maintained open, thus neutralizing the action of the pump, which ceases to draw in fresh fluid on the suction stroke until the valve again closes on the reduction of receiver pressure. In the form shown in Fig. 2, the lower end of a nipple connexion 6 between the pump 1 and the receiver is formed as the seat of a disk valve 8 mounted on a controlling-piston 9 provided with a cupleather 14. The underside of the piston is under the action of the atmosphere and a spring 15. A vent-hole 17<a> normally covered by the piston 9 may be provided to allow excess air to escape on the development of abnormal pressure. In the form shown in Fig. 5, the check valve 7 is pivoted to a cup 10 carried by a diaphragm 18 which is under the action of a pump pressure on one side and under the action of the atmosphere and a spring 15 on the lower side. The diaphragm is adapted to operate a relief valve 20 through a bell-crank 21 when the pressure becomes excessive. To maintain a constant pressure below that of the atmosphere, the action of the check valve is reversed, thus making it an inlet valve, and an exhaust valve is added, or the cup-leather of the pump piston is reversed. The apparatus may be used for controlling the pumping of liquid into a receiver, in which case an inlet check-valve is provided and the vent-hole or relief valve is omitted, the compression space being capable of increasing at each delivery stroke if the liquid tends to be compressed beyond a predetermined limit.
Patent GB-1441374-A (GB)
Title: Static frequency changers
IPC: H02P6/14
Filed: 1974-04-26
Abstract: 1441374 Frequency changing: control of brushless motors SIEMENS AG 26 April 1974 [26 April 1973] 18491/74 Headings H2F and H2J A frequency changer comprises a linecommutated bridge rectifier 2 coupled to A.C. supply terminals RST and providing an intermediate D.C. on lines 3a, 3b which feed inverter 5 comprising a first commutating capacitor 5i associated with controlled rectifiers 5a, 5b on the positive side of the intermediate D.C. supply. Further rectifiers 17a 17c are arranged to form a bridge with the rectifiers 2a... 2c supplying the positive side of the intermediate D.C. supply, said further bridge providing charging means for the commutating capacitor 5i. The invention is applicable to control of a synchronous motor 1. Triggering pulses for the inverter .thyristors 5a ... 5d are derived from a rotor position sensor 6 (of Hall type) via a logic stage 8. A desired speed signal 11 is compared at 10 with a signal from a tacho generator 7 and the error added at 13 to signals from a current transformer 14 so as to provide control signals for a trigger pulse generator 15 which controls the conduction angle of the thyristors 2a...2f in rectifier 2 and so determine the magnitude of the intermediate D.C. and hence the speed of the rectifier motor 1. At low or zero speeds, the voltage of the intermediate D.C. may be too low to charge commutating capacitors 5i, 5k sufficiently. In such circumstances they are respectively charged from the further semicontrolled bridges formed by thyristors 2a ...2c and diodes 17a ... 17c; and thyristors 2d...2f and diodes 18a ... 18c. The commutating capacitors 5i ... 5k are charged with alternate polarity on alternate half cycles of the output from inverter 5, the reversal of polarity being allowed by isolating diodes 27, 28, 31, 32. A time delay relay may be incorporated in block 15 so as to allow for the time constant of resistors 25, 26, 29, 30 and the commutating capacitors 5i, 5k when starting.
Patent GB-968192-A (GB)
Title: Air cushion vehicles
Inventor: JONES RICHARD STANTON
IPC: B60V1/16
Filed: 1959-09-25
Abstract: 968,192. Air cushion vehicles. HOVERCRAFT DEVELOPMENT Ltd. Sept. 26, 1960 [Sept. 25, 1959], No. 18552/64. Divided out of 968,191. Heading B7K. An air cushion vehicle has the cushion space bounded for at least part of its periphery by structural means and in part by a curtain of moving fluid issuing below the structural means, the structural means comprising an inflatable door structure 5 depending below the inner boundary of a port 8 supplying fluid for the formation of the fluid curtain, and a flexible membrane 10 depending from the bottom of the vehicle on the other side of said port, the fluid flowing down between the inflatable structure and said membrane to issue from the bottom of the structural means in the form of a fluid curtain. Specifications 854,211 and 968,193 also are referred to.
Patent GB-393100-A (GB)
Title: Improvements in door and other checking or retarding devices
IPC: E05F3/16
Filed: 1932-07-01
Abstract: 393,100. Door-checks. OSBORNE, R. S., 62, Jerry's Lane, Erdington, and DAWES, G. R., 2, Newhall Street, Birming- ham. July 1, 1932, No. 18608. [Class 65 (i).] In a door-closing device comprising a torsional spring which is wound up by the opening of the door, and a frictional check to prevent a too rapid closing of the door, means are provided to release the friction brake when the door is nearly closed. An arm 9 is attached to a lever 10 pivoted at 11 to the door frame so that when the door is opened a spindle 3 is turned and winds up a spring 6. The spring ends are fixed to a movable disc 1 which turns with the spindle, and to a fixed disc 2 secured to a supporting bracket 4 by a pin 5. A flexible steel band 12 with a frictional surface lining 13 is secured at one end to the bracket 4 by a pin 16 passing through lugs 15, and at the free end the band is secured to a bracket 17 having a lug 18 through which passes a drawbar 19. A compression spring 20 exerts a force between the lug 18 and the head 21 of the bar 19. The lower end of the bar passes through a block 22 pivoted to a link 24 which is supported on a pin 16 in the bracket 4. A cam member 30 is secured to the movable end disc 1 in an adjustable manner by means of the quadrant slots 31 in the cam engaged by pins 32 fitted with nuts. A roller 29 pinned to the link 24 rides up on the cam when the door is opened relieving the compression of a spring 28, but increasing that of the spring 20, and thereby drawing the free end of the band on to the drum. When the door is allowed to close under the action of the spring 6 the pull on the drawbar 19 causes the band 12 and its lining 13 to bear on the side of the drum 7 and retard the closing action until the roller runs off the cam and relieves the load. The cam 30 may have a curve 33 in its contour near the finishing point.
Patent GB-256242-A (GB)
Title: Improvements in tents
IPC: E04H15/56
Filed: 1926-07-27
Abstract: 256,242. Pelterie, R. Esnault-. July 30, 1925, [Convention date]. Seats convertible into tables.-A tent is provided with a pair of bed frames v, which are pivotally mounted on axles y and are adapted to be used as seats with backs, and also as supports for tables x. When the frames are in normal position. and the tables are vertically disposed, such members constitute seats with backs. The bed frames are vertically disposed when required to support the tables x. Arms w facilitate handling of the tables, and folding feet z are provided on the bed frames.
Patent GB-224936-A (GB)
Title: Improvements in telephone transmitters and receivers
IPC: H04R9/04
Filed: 1923-07-21
Abstract: 224,936. Sykes, A. F., and Marconi's Wireless Telegraph Co., Ltd. July 21, 1923. Magnetic instruments; diaphragms.-In a telephone transmitter or receiver, a conducting winding or membrane, which is in effect non-resonant, is immersed in a magnetic field and combined with a barrier or means for restricting the motion of the air particles which convey the sound waves. In one form, Fig. 3, a sheet of thin metal foil C is supported between the pole-pieces A, B, of a horse-shoe magnet H in front of a shallow channel in a plate of bronze J, to which the magnet and pole-pieces are secured. Rubber strips 0 serve as a means of support. The strip C is sufficiently thin and long to reduce its natural frequency to a negligible amount. The whole of the strip C is exposed to the sound waves, and slits may be cut in it and the surface smeared with the substance sold under the registered trade mark " Vaseline." The effect of the shallow channel to the rear to which the sound waves have access is to restrict the amplitude of vibration of the strip more for low than for high frequencies. Lateral passage way for the sound waves between the pole-pieces and the reflecting barrier is avoided. It is stated that a receiver and transmitter of this type yields a nominally true reproduction of the original sounds without the use of the correction circuits described in Specification 160,223. The ends of the strip C are connected to a transformer M. The shallow channel behind the strip may be filled with an absorbing medium, such as pile velvet or cotton wool. In another form, Fig. 5, the energizing winding D forms the reflecting barrier. The coil C, which may be of many turns, may be lightly stuck to a pad of cotton wool Q, or may be suspended by ligaments, or attached rigidly at one or more points to either the inner pole, the outer pole, or the reflecting surface. The sound-absorbing material Q need not touch the coil. A polar ring R is secured to the magnet limbs and to gun metal covers which, together with the limbs, completely encircle the winding D; or the field magnet may be formed as a pot of cast iron.
Patent GB-1283656-A (GB)
Title: System for effecting contact between fluid reactants and finely divided solid catalyst particles
IPC: C07C51/573
Filed: 1970-04-20
Abstract: 1283656 Fluidised bed catalytic reactors BADGER CO Inc 20 April 1970 [21 April 1969] 18842/70 Heading B1F Gas/solid separators 44 separate catalyst entrained in the gaseous product stream from fluidised bed 18, and the separated catalyst is returned to the bed 18 via pipe 26 and non- return valve 28. The product stream from bed 18 reaches the separators 44 via pipes 56 which are surrounded by cooling fins or jackets. Separators 44 may comprise cyclones, or filter elements.
Patent GB-1148714-A (GB)
Title: Improvements in grates
Inventor: MARTIN JOHANNES JOSEF
IPC: F23H7/06
Filed: 1966-04-29
Abstract: 1,148,714. Grates. J. J. MARTIN and W. J. MARTIN. 29 April, 1966 [29 April, 1965], No. 18905/66. Heading F4B. In a furnace grate having grate bars or elements 1, 1a co-operating with subjacent bars or grate elements at one end, the bars 1, 1a are held down at their free ends -by spring loaded links 2b, 2. The-bars may be biased by adjustable weights, and may form bridges between grate rollers. The grate element held against lifting may be a dead-plate.
Patent GB-1187044-A (GB)
Title: Improvements in or relating to Appratus for Measuring the Instantaneous Power Transmitted by a Rotatable Shaft.
Inventor: CAYLAKIAN MIGIRDIC KETEON
IPC: G01L3/24
Filed: 1967-04-25
Abstract: 1,187,044. Dynamometers; speed indicators; indicating apparatus. M.K. CAYLAKIAN. April 25, 1967, No. 19019/67. Headings G1J; G1K and G1W. Apparatus for measuring the instantaneous power transmitted by a rotable shaft A-A comprises three devices, the first device 1 measuring the instantaneous torque exerted by the shaft, the second device 2 measuring the instantaneous speed of rotation of the shaft and the third device Fig.3 combining the measurements of the first and second devices to provide an indication of the instantaneous power transmitted by the shaft. The torque measuring device 1 comprises three shaft portions 5, 6, 7 arranged in a gap in the shaft A-A in such a way that the portions 6, 7 are attached to the shaft A-A and the portion 5 is slideable in the portion 6. The slideable portion 5 is so provided with ball bearings 11 which are urged by a spring into engagement with a cammed surface 10 provided on a cylindrical member 8 attached to the shaft portion 7 that, according to the torque of the shaft, the ball bearings 11 ride up the cammed surface 10 against the bias of the spring 13 so as to move the portion 5 relative to the portion 6 in accordance with the torque. The speed measuring device 2 comprises a frame 19 provided with cammed surfaces 22 and arranged through bevel gears 20, 21 to rotate at a speed proportional to the speed of the shaft, weights 23, 24 being arranged, due to centrifugal force, to urge a rod 25 against the bias of a spring 26 whereby the rod 25 moves by an amount proportional to the speed. The two devices 1, 2 are arranged to move a member 39 Fig.3 into a liquid filled enclosure by an amount proportional to the product of torque and speed so as to provide a power reading on a linear scale 44 arranged alongside a tube 43 containing the liquid.
Patent GB-569401-A (GB)
Title: Improvements in or relating to packing devices for fluid pressure apparatus
IPC: F16J15/20
Filed: 1943-11-16
Abstract: 569,401. Stuffing-boxes; packing. AUTOMOTIVE PRODUCTS CO., Ltd., RIBBESFORD CO., Ltd., THORNHILL, P. W. and ONIONS, J.H. Nov. 16, 1943, Nos. 19132/43 and 22657/44. [Class 122 (v)] A packing ring comprises a backing 11 of soft rubber &c. integral with a facing element 10a, 10b, formed of laminations of fabric impregnated with rubber, &c the edges of the laminations being presented to the rubbing surface. The facing element may be internal or external, or may be radial to engage an end rubbing surface; a facing element may be provided on each side of a backing ring. The packing may be formed by superimposing sheets of impregnated canvas and partially vulcanising to form a pliant sheet which is then cut into narrow strips. A strip is wound helically on a former and covered with a thick layer of rubber mix. e.g., by winding a sheet of calendered rubber on to the required thickness, the whole being treated in a vulcanising press, Fig. 9, and afterwards cut into rings. Packing with an external face is formed by winding the strip in a mould and the backing layer applied to the former. A backing as in Fig. 4 is formed by winding a strip spirally. The strips may be cut at right angles or at an inclination to the face of the sheet. Alternatively, the packing may be formed of separate rings of fabric superimposed and impregnated, or rings cut from a compound sheet.
Patent GB-864773-A (GB)
Title: Improvements in or relating to wired broadcasting systems
Inventor: GABRIEL RALPH PARTON
IPC: H04H20/82
Filed: 1957-06-18
Abstract: 864,773. Distributing music &c. COMMUNICATIONS PATENTS Ltd. June 18, 1957, No. 19134/57. Class 40 (4). In a wired broadcasting system in which alternative programmes are distributed over a physical pair and a phantom circuit, respectively, programme signals are injected into the phantom circuit at a lower potential level than they are into the physical pair, with a consequent tendency for the subscriber's equipment to produce different levels of output according to which programme is selected, the subscriber's equipment includes means operative as either programme is selected, to counter this tendency. As described, three audio-frequency programmes are distributed, programme A over the pair 2, 3; programme B over the pair 4, 5; and programme C over the phantom circuit of these two pairs. The characteristics of a phantom circuit are such that it is advantageous to energize it at about half the voltage used to energize the side circuits. Such operation, either alone, or in combination with the fact that the resistance of the phantom is approximately one-half, its inductance one-third, and its capacitance three times that of one of the side circuits tends to produce an output level different from that of a side circuit. To obviate this a subscriber's equipment, such as X, has, ganged to the selector switch 11, a further switch 14 which applies the output of the volume control 10 to the primary winding of the loud-speaker 9, the arrangement being such that when a side circuit is selected for use the whole of the primary winding is employed, but when the phantom circuit is to be used only a portion of the primary winding is employed, the portion being such that substantially the same output level obtains whichever of the three circuits is selected for use. Alternatively, the further switch ganged with switch 11 may vary the resistance of the volume control 10 when the phantom circuit is selected, or it may control the insertion of an appropriate line terminating impedance as each circuit is selected for use to maintain substantially constant output level, the latter arrangement being suitable for use in television picture distribution systems.
Patent GB-864452-A (GB)
Title: Improvements relating to colour television
Inventor: GARGINI ERIC JOHN
IPC: H04N11/12
Filed: 1956-06-21
Abstract: 864,452. Multiplex radio signallings. ELECTRIC & MUSICAL INDUSTRIES Ltd. June 13, 1957 [June 21, 1956], No. 19201/56. Drawings to Specification. Class 40(5) [Also in Group Xl(b)] Relates to a colour television system (see Group XL(b)) wherein a first carrier wave is amplitude modulated by a brightness or luminance signal and phase modulated by a first part of the colour information, preferably the hue, whilst a second carrier wave spaced in frequency from the first is amplitude modulated by a second part of the colour information preferably the saturation. In accordance with a feature of the invention, the second carrier wave comprises the carrier wave which is modulated in frequency to convey the associated sound signal. The sound signal is employed to frequency modulate an N.T.S.C.-type colour subcarrier signal of frequency F so that the signal bears three modulations, amplitude representative of saturation, phase representative of hue and frequency representative of sound. The signal is then added to a luminance (or brightness) signal and modulated by a wave of frequency F equal to the desired first carrier and arranged to bear phase modulation representative of hue. The resultant signal then comprises a signal of frequency F bearing amplitude modulation due to luminance and phase modulation due to hue, a differencefrequency signal of frequency F-f bearing amplitude modulation representative of saturation, frequency modulation representative of sound but no phase modulation since it appears in both the originating signals and therefore cancels in the difference-frequency signal, and a sum frequency signal bearing all modulations which is eliminated by filtering.
Patent GB-381233-A (GB)
Title: Improvements in or relating to thermionic valve circuit arrangements
IPC: H03F3/32
Filed: 1931-07-03
Abstract: 381,233. Valve circuits. ELECTRICAL RESEARCH PRODUCTS, Inc., 195, Broadway, New York, U.S.A.-(Assignees of McNally, J. O. ; 48, Mountain Avenue, Maplewood, New Jersey, U.S.A.) July 3, 1931, No. 19269. Convention date, July 9, 1930. [Class 40 (v).] In order to compensate for imperfect matching in the characteristics of push-pull valves and to prevent damage to one valve in case of failure of the other, grid-biasing resistances are provided in the anode-cathode circuit of each individual valve. The push-pull valves 3, 3<1> have their filaments heated by alternating current from separate secondaries 8, 8<1> of the power transformer. The common portion of the two grid circuits includes a resistance 7, which with condensers 12, 12<1> forms a filter to eliminate ripple in the separate grid-biasing resistances 9, 9<1> connected between the high tension negative terminal 13 and the individual centre points of the windings 8, 8<1>. Resistance 7 is large compared with 9 or 9<1> and the filter prevents hum or noise components of the space current reaching the grids. Where indirectly heated valves are employed, the filaments are supplied from a single winding and the resistances are connected between the cathodes and high tension negative, Fig. 2 (not shown). The invention is applicable either to amplifiers or oscillators.