baber/WOPTO huggingface dataset:
Patent GB-1389697-A (GB)
Title: Control device for electrical converters
IPC: H02M7/155
Filed: 1972-06-21
Abstract: 1389697 Controlling converters ALLMANNA SVENSKA ELEKTRISKA AB 21 June 1972 [22 June 1971] 29004/72 Heading H2F In a phase control system, e.g. for an HVDC converter, in which the difference between the real value and a desired value of converter current is fed into a control amplifier 31, arranged to change the conduction angle of controlled rectifiers in the converter, a compensating circuit is included to improve both the speed of response and stability of the system. The compensating system includes an integrator 20, 22 connected into the control system only at the time of the control pulses for the converter rectifiers. As described, the converter may be of the type described in Specification 1,238,720 in which control pulses are normally supplied at intervals T/n where T is the period and n is the  pulse number; the period being modified in accordance with the difference between real and desired values of current. Signals proportional to T/n, the time t to the last control pulse and the current error signal #t are combined in a summing junction 4, the output of which controls the timing of triggering pulses from generator 18. At time tl (Fig. 2) a deviation occurs between real and desired value of current which results in a signal e31 which is passed via junction 4 to advance or delay the next pulse e18 so as to attempt to correct the output current. At the time t2 of the next control pulse, an electronic switch 21 feeds the error signal e31 to an integrator 20, 22 so that, after further amplification at 27 an integrated version of e31 will be fed to the summing junction 4 so as to reduce the effect of e31. A resistor 23 is included to determine the time for which the integrated error is effective. In Fig. 3 (not shown) a further summing junction (5) is included at the output of amplifier 31 in order to insert the output of integrator 20, 22 which is supplied with the error signal at the input to summing junction 4 via the electronic switch 21.
Patent GB-717468-A (GB)
Title: Explosively-operated tool for driving bolts, pins, or the like into structural members
IPC: B25C1/12
Filed: 1952-11-17
Abstract: 717,468. Explosively-operated devices for firing bolts. BEHREND. H. Nov. 17, 1952 [Nov. 21, 1951], No. 29038/52. Class 119 An explosively actuated device for firing pins and bolts into masonry, etc., has a barrel 3 containing a bolt 1 and cartridge 2 and expanding sleeve 4 provided with lugs 22 which spring into recesses 20 in the casing 5. The sleeve 4 may be integral with a breech block 23 in front of which is an expanding sleeve 6 bearing against a splinter-guard 7 and having its forward end engaged in recesses 21 in the casing. Within the block 23 a leaf-spring 9 holds in place a locking bolt 8 bearing against a firing-pin 10 extending from a housing 12. The housing 12 has a flange engaging a sleeve 14 within which a compensating spring 13 is held by a head or handle 16. The breech block is spaced from the sleeve 14 by a spring 15. Fixed to a leaf-spring 18 is a trigger 17. To operate the device, the muzzle of the barrel which extends beyond the guard 7 is placed against a wall and pressure applied to the head 16. The barrel 3 forces the lugs 22 out of engagement with the casing 5, whereupon they move into engagement with grooves 30 on the barrel, thus locking the breech block and barrel together. Further pressure on the head 16 causes barrel and breech block to move together rearwardly, bringing the splinter guard into contact with the wall, whereupon the casing 5 moves forward to abut the guard and simultaneously the firing-pin spring 11 and the spring 15 are stressed. The various parts are then in the positions shown in Fig. 2 with the trigger 17 in alignment with the bolt 8, so than on pressing the trigger the bolt is moved out of the path of the firing-pin, which is driven forwards by its spring to fire the cartridge 2 and eject the stud 1. The device may be provided with a barrel containing a plurality of cartridges and studs, the barrel being rotated within the casing 5 to bring the cartridges successively into alignment with the firing-pin. The expanding sleeve 6 may be replaced by a sleeve having seatings for balls which escape radially when pressure is applied to the forward end of the sleeve.
Patent GB-713727-A (GB)
Title: Process for the production of organo-tin compounds
IPC: C07F7/22
Filed: 1952-11-18
Abstract: Organo-tin compounds of the general formula RaSnXb, wherein R represents a hydrocarbon radical, X represents a halogen atom, a represents 2, 3 or 4, and b represents 0 or a whole number such that a and b is 4, are prepared by reacting a hydrocarbon halide with tin in the presence of magnesium.  It is preferable to carry out the reaction at a temperature between 140 DEG  and 170 DEG  C., or at a temperature at least as high as the boiling point of the reaction mixture.  An inert reaction solvent may be used, e.g. a hydrocarbon compound such as benzene, cyclohexane or iso-octane, ligroin or petroleum ether.  The nature of the reaction product obtained may be controlled by varying the reaction solvent and the ratio of the quantities of magnesium, tin, organic halide and solvent used. Mercury or a mercury salt is capable of catalysing the reaction, mercuric chloride and bromide being given as examples of suitable mercury salts.  The magnesium and tin may be used in the form of a powdered tin-magnesium alloy, e.g. an alloy containing approximately two magnesium atoms to one tin atom.  Alkyl or aryl chlorides or alkyl bromides may be used in the process, the preferred organic halides being ethyl chloride and bromide and n-butyl bromide.  In the examples tetraethyl-tin, tri-n-butyl-tin bromide, triethyl-tin bromide and chloride, and diethyl-tin dibromide and dichloride are prepared.  Specification 668,561 is referred to.
Patent GB-911859-A (GB)
Title: Improvements in and relating to electric heaters
IPC: H05B3/64
Filed: 1958-09-12
Abstract: 911,859. Electric furnace heaters. COLE, M. Sept. 2, 1959 [Sept. 12, 1958], No. 29216/58. Class 39 (3). . An electric furnace heater, capable of sustaining temperatures in excess of 1600‹ C., comprises a hollow tubular casing 1 of recrystallized alumina or thoria containing a heating element 11 of molybdenum, tantalum, tungsten or silicon carbide and a protective gas filling, e.g. of hydrogen or argon. As shown, the heating element is a coil 11 which may be self-supporting or sprung against the inner surface of the casing 1 or wound on the tube 8, but it may be a rolled sheet, a split or helically cut tube or a straight tube or rod. The casing is closed at its upper end with a metal head 2 provided with inlet and outlet passages 10, 8 and 9 for circulation of the protective gas. Alternatively, the casing may be charged with protective gas from a reservoir through a single valve-controlled connection in the head 2. The lower part of the casing may be filled with powdered or granular material, in which the heating element is buried, to moderate the pressure rise within the casing due to increasing temperature.
Patent GB-1203919-A (GB)
Title: Surge arrester
IPC: H01T1/15
Filed: 1969-06-10
Abstract: 1,203,919. Surge arresters. BROWN, BOVERI & CO. Ltd. 10 June, 1969 [12 June, 1968], No. 29237/69. Heading H2H. A stack of spark-gaps and resistance rings forming a column in a surge arrester define a central channel so that internal pressure is constrained to act only on release devices at the ends of the column and not on the casing of the arrester. As shown, the casing 1 is closed at its ends by fracture diaphragms 5 attached to cover plates 3 which have radial spokes 9. A central channel 8 is formed through resistance rings 6 and insulating rings 7a supporting spark-gaps 7 which are serially connected by conductors 7e. The column is separated from the casing 1 by an annular space 10, and excessive thermal and mechanical forces break only the diaphragms 5. Safety valves may be used instead of the fracture diaphragms.
Patent GB-484155-A (GB)
Title: Improvements in or relating to flexible harrows and like implements and parts therefor
IPC: A01B19/08
Filed: 1936-10-28
Abstract: 484,155. Implements for working land. NICHOLSON, A. C. Oct. 28, 1936, No. 29272. [Class 6 (i)] A flexible harrow comprises a network of links which are detachable from one another and adapted to carry tines. Each link consists of two parts 10, 13 which can be detached from one another and which can be connected together rigidly to form a single member. The connecting means consists of a block 14, two constructions of which are shown in Figs. 2 and 6. In both constructions the block 14 is formed with recesses which receive the ends of the link parts 10, 13, the part 10 having a bent portion 12. In the form shown in Fig. 6, the part 13 consists of an eye having turned-up ends 13b. The block 14 is provided with a cover which clamps the parts 12, 13 together. The cover is held to the block 14 by a bolt and nut 16 as shown in Fig. 1. In the form shown in Fig. 6 a tine 15 is also clamped in the block 14. In Fig. 2 a tine 15 is shown formed in one with the loop 13. The ends of the tines may be of different shapes as shown in Fig. 1, In another construction the tine has a ring-shaped portion through which the bolt 16 passes. The tines may be bent so that both ends make contact with the ground at the same time. The eyes or loops 13 may be made of softer metal than the remaining parts of the links. Wear is thus confined to the eyes which can be readily renewed.
Patent GB-504390-A (GB)
Title: Improvements in hydraulic power transmitters having speed-responsive regulators
IPC: F16H45/00
Filed: 1937-10-26
Abstract: 504,390. Centrifugal governors. VOITH, W., VOITH, H., and VOITH, H., (trading as VOITH, J. M., [Firm of]). Oct. 26, 1937, No. 29278. Convention date, Oct. 29, 1936. [Class 57] [Also in Group XXIX] A hydraulic power transmitter of the kinetic type yielding two or more speed stages is provided with a centrifugal speed-responsive regulator for effecting gear-changing between said speed stages, wherein, for the purpose of stabilizing the change point, that is for the purpose of causing the change from a lowerspeed stage to the next higher-speed stage to occur at a speed higher than that at which the opposite change occurs, the centrifugal masses of the regulator are adapted to be loaded with-restoring forces of different magnitudes in succession and the stiffness and the initial straining of the resilient restoring means for the centrifugal masses of the regulator are so selected that they produce an unstable characteristic for each gear change, that is to say, the increase or decrease in restoring force. exerted by the restoring means when they are compressed or extended during a gear change, is smaller than the increase or decrease in centrifugal force on the centrifugal masses, due to their displacement between their innermost and outermost positions determining such change. In a transmitter comprising, Fig. 1, a torqueconverter W, a coupling K<2> associated with speed reducing gear G, and a coupling K<1>, the regulator R belt-driven from the output shaft S actuates a valve 9 controlling selective filling of the turbo-circuits. The regulator comprises, Fig. 2, a casing 3 mounted on a shaft 2 driven by a pulley 1 ; centrifugal masses 4 are mounted in grooves on the casing and covered by a disc 5, acted upon by two springs 6, 7 ; initially the spring 6 acts alone until a stop 8 is reached, and thereafter the springs act in conjunction. In this arrangement, the valve 9 actuated by the regulator acts as a pilot valve for the hydraulic actuation of the valves A, B, C controlling selective filling of the turbo-circuits. In a modification, Fig. 3, the masses 4 are mounted between discs 3', 3<11> acted upon by springs 12, 13 respectively, and having stops 8, 11.
Patent GB-1187447-A (GB)
Title: A Tap Changing Apparatus for an Electric Winding
IPC: H01F29/04
Filed: 1967-06-26
Abstract: 1,187,447. Vacuum switches; transformers. GENERAL ELECTRIC CO. 26 June, 1967 [5 Aug., 1966], No. 29321/67. Headings H1N and H1T. A tap changing apparatus includes a vacuum switch 26 which is arranged so that an increase in pressure within the switch envelope 50, e.g. due to entry of insulating liquid, causes the switch to maintain its contacts open. As shown, a lost motion connection is provided by a cage 63 mounted on an actuating rod 60, a contact pressure spring 62 and a shoulder 64 on the movable contact carrying rod 55. A spring 58 tends to open the vacuum switch contacts 51, 52 and the differential pressure acting on the bellows 57 tends to close the contacts. Should the pressure in the envelope 50 rise, the force acting on the bellows is reduced and the spring 58 is able to move the rod 55 downwards against the bias of the spring 62 to open the switch contacts 51, 52. In an alternative arrangement no contact pressure spring is provided, the closing bias due to the differential pressure acting on the bellows normally exceeding the opening bias of the spring 58. Contacts 80, 81 may be coupled to the contact carrying rod 55 and to the actuating rod 60. In the normal operation of the switch, either the contacts 80 or the contacts 81 are open, but when the pressure rises contacts 80 will be closed when the contacts 81 are closed. This completes a circuit for an indicating lamp 76 and for a relay 72 which opens its contacts 73 in circuit with the drive motor 30 of the tap change operating mechanism 28. These contacts are paralleled by contacts 74 which open only at the end of a tap change cycle of operation.
Patent GB-225370-A (GB)
Title: Improvements in or relating to brakes for vehicles
IPC: F16D49/16
Filed: 1923-11-21
Abstract: 225,370. Mowbray, J. Nov. 21, 1923. Actuated by road vehicle tipping or balancing arrangements; blocks acting on drums; handactuation.-In brakes, particularly for twowheeled horse-drawn vehicles, a gear wheel 1 is rigidly attached to each wheel, and brackets 3 secured to the vehicle body carry a spindle 7 on which are mounted gear wheels 8, fitted with brake drums 9 adapted to be engaged by brake shoes 10 carried on a transverse shaft 11, when a spindle 14, mounted in a bracket 12 and engaging a nut 16 on the shaft 11, is rotated. Normally the blocks 10 are clear of the drums 9 and the gear wheels 1, 8 are out of mesh, the spindle 7 being located at the rear end of the slots 6 in the brackets 3 which are radially disposed with respect to the axis of the road wheels. When, however, the spindle 14 is rotated, the blocks 10 are first engaged with the drums 9, and the gear wheels are then brought into mesh, whereby the vehicle is braked. In the case of a tipwagon, movement of the wheels with the brakes applied and the body unlocked from the frame effects the tipping movement. The gear wheels 1, 8 may be permanently in mesh, if the latter are loosely mounted on the spindle 7.
Patent GB-445482-A (GB)
Title: Improvements in and relating to devices for delivering measured quantities of liquids
IPC: G01F11/44
Filed: 1934-10-13
Abstract: 445,482. Delivering measured quantities of liquids. BOWKER, R. P., 75, Charles Street, Sheffield. Oct. 13, 1934, No. 29341. [Class 106 (v)] In order to facilitate coating with a protective metal such as tin, the parts of a measuring tap of the rotary taper plug valve type which come into contact with the contents of the tap, the plug 1 is recessed at that portion 2 which comes into register with the outlet port 3 of the measuring chamber when the plug is in that position which allows the measuring chamber to be filled. The recessed portion is given a protective coating. The inlet part of the tap is formed as a separate member 6 and is connected with the body of tap by means of a coupling nut 4. A projecting member 10 engaging in a recess 11 in the part 6 ensures the correct relative positioning of the parts.
Patent GB-1116380-A (GB)
Title: Finger-grip food-product containers and finger-grip food-product container-forming blanks
IPC: A47G21/00
Filed: 1965-07-12
Abstract: 1,116,380. Finger-grip food container. A. B. WOOD. 12 July, 1965 [13 April, 1965], No. 29376/65. Heading B8C. A finger-grip container for a sandwich, sausage roll &c., comprises a base 36 and a pair of upwardly extending identical flaps 37 between which the sandwich &c. is supported, the base 36 being provided with a push-up tab 47 to lift the sandwich &c. in the container, and the flaps 37 having scores 39 to allow the outer portions of the flaps to be bent out. As shown, tongues 44 are formed to facilitate gripping the container contents on folding the outer flap portions. The flaps may be of semi-circular, rectangular, or triangular profile, and the base may be formed with two oppositely directed tabs 47. The container may be of cardboard or plastics, the whole being enclosed in a transparent plastics wrapper having lines of weakness (91), Fig. 15 (not shown), along its base to facilitate removal of the wrapper.
Patent GB-931232-A (GB)
Title: Improvements in or relating to hydrostatic power transmissions
IPC: F16H39/02
Filed: 1961-08-15
Abstract: 931,232. Two-stroke engines ; charging pumps ; cooling fans; starting. INTERNATIONAL HARVESTER CO. Aug. 15, 1961 [Nov. 28, 1960], No. 29394/61. Classes 7(2) and 7(5). [Also in Groups XXVIII, XXIX and XXXI] In a free-piston, two-stroke engine-driven pump assembly for an hydraulic transmission (see Groups XXVIII, XXIX and XXXI) two parallel engine-pump units each comprising a pair of power pistons 68, 69 and 68<SP>1</SP>, 69<SP>1</SP>, Fig. 4, coupled to opposed pump pistons 102, 103 and 102<SP>1</SP>, 103<SP>1</SP> are operatively connected by racks and pinions through shafts 88 and 88a such that the pistons of each unit reciprocate in axially opposed directions in synchronised relation and the pistons of one unit reciprocate 180 degrees out of phase with the pistons of the other unit. The power stroke of the pistons of one unit effects the compression stroke of the pistons of the other unit. The exhaust gases pass via ports 79 and conduits 83 to turbines 81, 81<SP>1</SP>, Fig. 7, connected to air-compressing turbines 84, 84<SP>1</SP> which feed air to the combustion chamber inlet ports 70. The engine is water-cooled and the radiator fan, dynamo, oil and water pumps are driven by an hydraulic motor. The starting procedure comprises moving the engine pistons 68, 69 to their innermost positions by means of an hydraulic ram 148, Fig. 4, acting on a rack 143 through a rod 144. Hydraulic pressure is also applied to a ram 158, Fig. 8, to close a valve 138 in the delivery line of the pump unit 120, a catch 174 holding the valve 138 closed. Hydraulic pressure is then applied to the pumping chamber 121, Fig. 4, through the pump delivery line to move pistons 68, 69 on their compression stroke, the injector or ignition systems 78, 87 being actuated in timed relation by cams 90, 90<SP>1</SP>. At the end of the compression stroke, a cam 184 releases catch 174 to open valve 138 prior to the delivery stroke of pump 120.
Patent GB-163368-A (GB)
Title: Apparatus for the shaping and moulding of headstones, archstones or the like of any given radius in stone, marble or the like
IPC: B24B9/06
Filed: 1919-11-25
Abstract: 163,368. Harrison, C. Nov. 25, 1919. Disc apparatus.-Apparatus for shaping stone, marble, &c., for example headstones &c., on curved lines of any required radius, comprises a grinding-disc 2, having a periphery of any required contour, rotating on a vertical shaft 3, and a work-supporting table 5 adapted to be oscillated about a vertical pivot 6, Fig. 1, whereby the stone &c. 1 is moved in contact with the grinding-wheel and is shaped to a convex curve. The table 5 is supported on a second table 4 by means of balls 7 kept in position by cage 8, and the pivot 6, which extends downwardly from the table 5, is adjustable in a slot 9 in the lower table to vary the radius of the curve to be formed on the stone &c. In order to form a concave curve, the pivot 6 is omitted and the stone &c. 1 is oscillated about the pivotal axis of a trammel 10, Fig. 4, which is secured to the stone; a similar trammel may be employed for the production of convex surfaces. According to the Provisional Specification, more than one abrasive disc may be used.
Patent GB-842144-A (GB)
Title: Method of and apparatus for equalising internal differences in moisture content of tobacco
IPC: A24C5/39
Filed: 1956-09-26
Abstract: 842,144. Treating tobacco. QUESTER, K. W., [trading as QUESTER MASCHINENFABRIK, W.]. Sept. 26, 1956 [Sept. 26, 1955], No. 29441/56. Class 130. [Also in Group XXX] Internal differences in the moisture content of cut tobacco passing from one or more shredding machines 1 to a battery of cigarette-making machines 2 are equalized by spreading the tobacco by an oscillating-frame conveyer 5 in thin and uniform layers 4 in a container 6 the bottom of which is an endless belt 7 which when the container is full, is started 20 delivering the tobacco to carded rollers 12 from which pickers 14 discharge it down shoot plates 13 to a delivery conveyer 11 for the machines 2. The container 6 may be left filled for a period before the belt 7 is started, or two containers 6 may operate in parallel, one being filled whilst the other delivers. Drying or roasting and cooling of the tobacco may be effected before or after passing the container 6. The carding on the rollers 12 may comprise spikes secured in wooden strips bent to circular form and screwed to metal rollers 12 so that the spike bases are pressed thereagainst. Rotating or reciprocating rakes may replace the rollers 12. The belt of the conveyer 5 moves in the direction of the arrow 16 as the conveyer frame moves to the right and in the direction of the arrow 17 as the conveyer frame moves to the left.
Patent GB-689572-A (GB)
Title: Aid to folding large pieces of flat work
IPC: D06F89/00
Filed: 1949-11-18
Abstract: 689,572. Folding piece goods. SWIFT, J., and JENNER, Ltd., A. & C. Nov. 17, 1950. [Nov. 18, 1949] No. 29505/49. Class 42 (ii). Apparatus for facilitating the folding and delivery of flatwork comprises a table 1, 2 having a transverse slot 4 and adapted to receive longitudinally folded work, and a power driven arm 7 rotating about a horizontal axle 8 and having a rod 13 extending at right angles from one end thereof and adapted to pass upwardly through the slot 4 at each rotation so as to pick up the work 16 laid on the table at approximately its middle, and transfer it to a table 5, which is provided with an arcuate shield 6. Alternatively, both ends of the arm 7 may be provided with rods.
Patent GB-1516842-A (GB)
Title: Digital signal transmission
IPC: H04L1/00
Filed: 1974-07-03
Abstract: 1516842 Data transmission BRITISH BROADCASTING CORP 2 July 1975 [3 July 1974] 29516/74 Heading H4P In a digital signal transmission system in which the input signal, e.g. a television signal, comprises a plurality of words each of which consists of a plurality of bits, a group of bits of the same significance is selected from several different words and the bits of the group are then combined, e.g. by modulo 2 addition, to provide a parity bit associated with the selected group. After transmission, errors in the received signal are detected by generating parity bits according to the same procedure, comparing the generated parity bits with the corresponding received parity bits, and when the generated and received bits differ in respect of a group, estimating a value for each word containing a bit from the respective group. and comparing the estimated value with the received value for the word to detect any word containing an erroneous bit. The estimated value may be derived by averaging a predetermined preceding word and a predetermined succeeding word. Suitable arrangements for effecting the various operations and the advantages of this method of error correction over the usual "concealment" method are described with reference to Figs. 1 to 5 (not shown).