baber/WOPTO huggingface dataset:
Patent GB-1498397-A (GB)
Title: Circuits for supplying electrical current from an alternating voltage source to a load
IPC: H02M5/253
Filed: 1976-09-17
Abstract: 1498397 Switching systems for power supplies MULLARD Ltd 17 Sept 1976 38563/76 Heading H2H  A circuit for supplying power to a load L comprises a semi-conductor switch T, a generator I 1  for supplying trigger current to the switch and a control circuit for turning the trigger current generator on and off, the control circuit including a comparator COMP for comparing two control voltages Vc, Rr, a detector DET responsive to the voltage across the switch and a gate G1. The control voltage Vc is a variable D.C. reference voltage derived from a potentiometer Rc supplied with a voltage -V from a source 200. A generator 100 supplies the control voltage Vr which is a ramp waveform at twice the frequency of the mains A.C. supply connected to terminals 1, 2. In each half cycle of the mains supply waveform, when the ramp voltage Vr falls below the voltage Vc the comparator turns on the trigger current generator which causes the switch T to conduct. The switch may be a triac or a thyristor and when the voltage across it falls below a predetermined value which is close to zero volts, the detector DET causes the NAND gate G1 to disable the comparator. The trigger current pulse supplied to the switch T is therefore terminated to prevent consumption of energy dua to the unnecessary continuation of the supply of the trigger pulse. The source 200 disables the gate G1 to prevent triggering of the switch T if the voltage -V falls below a predetermined value. The load may be resistive, capacitive or inductive and may be a heating resistor in which case the voltage Vr is a temperature dependent D.C. voltage which is compared with the voltage Vc to provide thermostatic control. By modifying the generator 100 to provide a voltage Vr having a low frequency for example one thousandth that of the A.C. source burst firing control of the switch T may be provided. The transistor circuits constituting the components 100, 200, DET and COMP are described in detail, the ramp generator including a transistor circuit which detects the zero crossing region of the A.C. supply to enable charging of a capacitor for generating the rising portion of the ramp waveform.
Patent GB-1357956-A (GB)
Title: Synthetic plastics processing machine especially an injection- moulding machine or blow moulding machine with cooperating  hydraulic cylinders
IPC: F15B11/22
Filed: 1971-08-18
Abstract: 1357956 Injection moulding and blowmoulding machines; hydraulic presses STUBBE MASCHINENFABRIK GmbH 18 Aug 1971 [19 Aug 1970] 38804/71 Headings B5A and B5F The invention relates to an injection moulding or blow-moulding machine employing two or more cylinders 1, 2, 3 having different diameters, and piston rods 4, 5, 6 on one side which carry out synchronous strokes, wherein in each case the circular piston face 14 of a smaller cylinder 2 has the same area as and is connected to the annular piston face 13 of the next larger cylinder, and the circular piston face 12 of the largest cylinder 1 and the annular piston face 17 of the smallest cylinder 3 are alternatively connectibie to pressure medium supply and return conduits 24, 26. According to the invention the diameters of each larger cylinder, the next smaller cylinder and the piston rod of the larger cylinder represent a set of Pythagorean numbers or a whole number multiple thereof. The arrangement provides uniform movement of the piston rods and the invention enables the pistons, cylinders &c. to be selected from standard sized components. The invention can be used for mould closing (Fig. 5, not shown) or for operating ejector rods (Figs. 3, 4, not shown). In Fig. 6 (not shown) the two halves (73, 74) of a blow mould arc synchronized so as to meet one another exactly in line with the blowing head (72). The invention may be applied to only two or even four or more hydraulic cylinders. Compensation for leakage from the hydraulic system can be provided by opening shut-off valves 27, 28. This can be effected automatically at every piston stroke or after any desired number of strokes by means of the circuit shown in Fig. 2 (not shown).
Patent GB-1199092-A (GB)
Title: Radiant Heating Tubes for Industrial Furnaces
IPC: F23C3/00
Filed: 1968-08-16
Abstract: 1,199,092. Radiant heating tubes. J. AICHELIN K.G. 16 Aug., 1968 [17 Aug., 1967], No. 39225/68. Heading F4B. A radiant heating tube comprises a flame tube 6<SP>1</SP>, into which a burner 3, supplied with fuel and air through lines 4, 5, respectively, projects, the flame tube including at least in part interfitting arcuate ceramic segments. In the sheathed tube embodiment of Fig. 3, these segments, which are provided with interengaging tongue and groove surfaces, are assembled to form a heat-resistant lining within steel inner tube 14, adjacent assembled arcuate segments being stacked one on another, over the length of tube 14 between supports 11 and 12. Combustion gases from the short flamed burner 3 escape through the open end of tube 14, back through annular passage 15 between inner and outer steel tubes 14, 13, respectively. Projections 70 on the segments promote turbulence and so complete combustion of the gas/air mixture. In a modification (Fig. 5, not shown).the assembled segments themselves form the inner tube which is enclosed by a cage of vertically extending ribs supported against an outer steel tube. The exhaust gases from the inner tube, which escape through apertures in the segments, remote from the burner pass back along the groove-like exhaust paths defined between the inner and outer tubes and the ribs. The assembled segments may also be used to form one limb of a U-tube radiant heater (Fig. 1, not shown) or to form a straight through-flow or sinuous radiant heating tube (not shown). The segments are made of fireclay and/or silicon carbide, and may be permeated with a nickel catalyst to promote complete combustion. The wall thickness and the heat conductivity of the segments may be varied over the length of the radiant tube to promote even radiation along it. Exhaust gases from the tubes may be used to provide a protective atmosphere for the furnace in which they are installed. Coal gas, oil or hydrocarbon gases may be burnt within the tubes.
Patent GB-940982-A (GB)
Title: Coil spring
IPC: G04B1/14
Filed: 1959-11-19
Abstract: 940,982. Brushes for dynamo-electric machines. J. B. TIGRETT. Nov. 19, 1959 [Nov. 21, 1958], No. 39272/59. Heading H2A. [Also in Divisions F2, F4 and G1] A carbon brush 126 sliding in a holder 120 is urged into contact with an electrical armature 122 by means of a self-extending coil spring 128 having its free end 132, which may be unstressed, secured to the holder 120. The spring 128 is stressed longitudinally to assume, in its free state, a tightly coiled condition, and then transversely so that it is of concave-convex cross-sectional curvature with the convex surface facing inwardly toward the centre of the coil. The ratio of longitudinal to transverse stressing is chosen so that the spring is selfextending, however, this ratio may be varied so that a short section at the end 136 of the spring does not completely unwind. In an alternative arrangement, Figs. 13, 14, not shown, the free end of the spring is fixed to the brush.
Patent GB-1262171-A (GB)
Title: Superheterodyne receiver having automatic frequency control
IPC: H03J7/02
Filed: 1969-08-06
Abstract: 1,262,171. Radio receiving circuits; automatic frequency control. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 6 Aug., 1969 [9 Aug., 1968], No. 39415/69. Headings H3A and H3Q. The invention relates to a superheterodyne receiver incorporating a tuner 2 comprising tuned input circuits 3, mixer 5 and local oscillator 4, an I.F. amplifier 6 including adjacent carrier "trap" circuits 31.9 and 40.4 and an A.F.C. discriminator 10 deriving a frequency control voltage which is applied to the local oscillator 4 via a parallel-connected smoothing capacitor 11. The tuner is switched from station to station by means of control 12. If such an arrangement is switched from a first station for which the inherent tuning error has the maximum negative error, so that the voltage across capacitor 11 has its maximum positive value possible, to a second station for which the inherent tuning error has the maximum possible positive value, the tuning error resulting from the charge remaining stored on capacitor 11 is twice the maximum allowed for and carries the tuning past the upper "trap" frequency. When the A.F.C. then brings the tuning down to this "trap" frequency the signal disappears and further frequency correction is inhibited. To prevent this occurring, according to the invention a further switch 13 is coupled to the tuning control 12 and discharges the capacitor 11 when passing from one station to the next. The switch 13 may comprise a detent engaging notches in the edge of a disc on the shaft of control 12 (Fig. 4, not shown). In a colour television receiver the discriminator may be replaced by phase detector whose two inputs are derived respectively from the sound subcarrier and colour channels (Fig. 3, not shown). In a receiver operating on two wavebands the capacitor 11 may be duplicated, switching means being provided to switch the capacitors on the two wavebands; each capacitor has an individual discharging resistor (Fig. 5, not shown).
Patent GB-955436-A (GB)
Title: Improvements in blasthole charging or measuring rods
IPC: F42D1/16
Filed: 1962-01-03
Abstract: 955,436. Blasting equipment. E. L. WARD. April 1, 1963 [Jan. 3, 1962], No. 39432/61. Heading E1F. The core 2 of a blasthole charging or measuring rod is made of plastics, preferably glass fibre reinforced plastics, and is surrounded by a sheath 3 of anti-static material, preferably a rubber. To each end of the core 2 is secured by axially split, annular wedges 7, 8, 7<SP>1</SP>, 8<SP>1</SP> a non ferreous terminal ferrule 4, 4<SP>1</SP> allowing of connection of the rod to similar rods. A blowout preventer suitable for subaqueous drilling comprises a cylindrical housing 60 divided into two chambers 72, 73 by a transverse wall 71, the chambers containing resilient packing members 83, 84 which may be radially compressed on to a well member extending axially through both chambers by applying fluid pressure to annular pistons 93, 94 through ports 107, 112. The packing members are supported by members 85, 86, having ports 113, 114 which allow well pressure to act on the pistons to assist in compressing members 83, 84. Fig. 3 (not shown) illustrates a transverse wall which may be set in several positions so that one packing member may be larger than the other. During drilling both packing members are relaxed until high well pressure is encountered, then whilst drilling continues one member is compressed leaving the other in reserve.
Patent GB-394708-A (GB)
Abstract: 394,708. Knitting. WILDT, E., HOLMES, H. H., and WILDT & CO., Ltd., Adelaide Works, Leicester. Jan. 1, 1932, No. 87. Addition to 376,350. Drawings to Specification. [Class 74 (ii).] The method of knitting claimed in the parent Specification is modified in that the tension of a warp thread is released prior to the loopdrawing operation and after the thread has been passed round its needle. The thread thus tends to move towards the front of the needle hook, while the ground thread tends to be held to the rear. The shape of the hook is modified to facilitate this action. The warp draw-off device is so arranged as to release the warp at the proper time. Specification 364,039 is referred to.
Patent GB-889835-A (GB)
Title: Improvements in or relating to sonic or ultrasonic transducers
IPC: G10K11/00
Filed: 1958-12-08
Abstract: 889,835. Acoustic couplings. BENDIX CORPORATION. Dec. 8, 1958 [Dec. 30, 1957], No. 39500/58. Class 40(8). In order to prevent radiation from the liquidimmersed non - working surface of an electroacoustic transducer, the acoustic coupling between the face and the liquid is reduced by means of pressure-release means situated near the face. The transducer shown comprises a magnetostrictive driver 10a coupled to a radiating head 16 by means of a cylindrical motion-amplifier 10b of the type described in Specification 868,982. The amplifier and the head are immersed in liquid held within a tank 12. Radiation from the annular back face 17 of the head is prevented by a gas-filled toroid 18 of rubber or plastic material which is held in position near the face 17 either by its own buoyancy or by a framework 21. The toroid does not contact the whole surface of the face but is everywhere within one quarter-wavelength of the face. In a modification (Fig. 4, not shown), an axially elongated toroid which extends from the face 17 to flange 14 is used. A solid toroid made of impervious cellular material, e.g. sponge rubber, may be used.
Patent GB-395559-A (GB)
Abstract: 395,559. Calcu- 1 at ing - apparatus. BURROUGHS ADDING MACHINE CO., 2nd Avenue, Detroit, Michigan, U.S.A. Nov. 4, 1932, No. 31135. Convention date, Feb. 23. [Class 106 (i).] Calculating -apparatus for monetary &c. values.-In a machine adapted to perform calculations according to a non-uniform system the totalizers have pinions with different numbers of teeth and to hold the pinions against movement, when out of their active position in relation to the differential actuator racks, an aligning means with sets of engaging surfaces is provided to align' the pinions of different pitches. As shown in Fig. 1, applied to a multiple totalizer machine of the type described in Specification 274,411, [Class 106 (i), Calculating &c.], wherein the totalizers have groups of denominational pinions mounted on a sleeve 12 on a shaft 13 and longitudinally movable, under the action of a roller 31 co-operating with a cam bar 30 on the paper carriage, to position a totalizer for actuation by its actuator rack 610. The second actuator rack in the present instance is adapted to co-operate with the twelve toothed pinions of that section of the totalizers. On either side of this position the usual aligning bar 50, Figs. 3 and 4, is cut away at 61 and affixed to the bar are plates 62 with raised portions 63, 64 constituting bearing ridges 66 .. 69 for the teeth of the pinions. The ridges 66, 67 are set to engage the inner faces of adjacent teeth of a ten-toothed pinion whilst the ridges 68, 69 form a V-shaped notch to engage the opposite faces of a tooth of the twelve toothed pinion.
Patent GB-1078883-A (GB)
Title: Thermocouple junction
Inventor: PHILLIPS LEOPOLD SAMUEL
IPC: H01L35/16
Filed: 1964-09-30
Abstract: 1,078,883. Soldering. G. V. PLANER Ltd. Sept. 29, 1965 [Sept. 30, 1964], No. 39764/64. Heading B3R. [Also in Division H1] Electrical connection is made to a thermocouple member with a soldering material consisting wholly of a chemical element or elements present in the composition of the thermocouple member. Suitable solders include lead with 1-10 wt. per cent tellurium for lead telluride, lead with 2-10 wt. per cent tin for lead tin telluride, and tellurium with 15- 30% germanium for germanium telluride. Thermocouple members may be joined in an array to make thermoelectric generators or Peltier coolers. The ends of an array of P-type and N-type bismuth telluride elements are treated with an acidic solution of zinc chloride (a flux), and a molten alloy of bismuth and tellurium (5 wt. per cent) applied and allowed to harden. Nickel, copper, or gold connecting strips are now joined between adjacent elements by bonding them with heat and pressure to the soldered areas.
Patent GB-1126452-A (GB)
Title: Rotary heat engines
IPC: F02B53/00
Filed: 1966-09-06
Abstract: 1,126,452. Rotary engines. R.W. GAMAGE. Sept. 6, 1966, No. 39779/66. Heading F1F. A rotary heat-engine comprises a pair of externally-meshing screw-rotors 1, 2, Figs. 1 and 2, and a duct 23 connecting ports 24, 31 in the ends of a casing 3 to each other so that air compressed on one side of the rotors is transferred to the other side thereof and effects rotation of the rotors while undergoing expansion before it is ejected through a port 34 and a duct 35, the air being heated while it is transferred as aforesaid within a chamber 27 constituting a part of the duct 23. The compressed air may be heated by combustion of fuel Injected into the duct 23 through a nozzle 28, the fuel being ignited initially by a spark-plug 29. The air may be drawn from the atmosphere through a duct 20 and ports 17,18, and may be pre-compressed by a blower 19. The exhaust gases may be ejected either directly into the atmosphere or through a heat exchanger 26 containing a part of the duct 23. The ports 17, 34 are shaped and situated relative to the rotors such that in operation of the engine they are directly connected to each other by some of the helical grooves in the rotors to effect scavenging of the exhaust gases therein while these grooves are being re-charged with fresh air through the ports 17, 18. The configurations of the various ports beforementioned are described with reference to Figs. 3, 4, 6, and 7 (not shown) and for details thereof the Specification should be referred to. Scavenging may be improved by either providing a fan (not shown) in the duct 35 or said grooves being brought into register with the port 34 somewhat earlier than with the port 17 while the air or gases expanding in these grooves is or are still at a pressure exceeding that in the duct 35. The working cycle of the engine may be based upon the Diesel cycle or the Joule cycle; and a preferred working cycle is described with reference to Fig. 10 (not shown), for details of which the Specification should be referred to. Alternatively, the compressed air may be heated in a heat-exchanger 129A, Fig. 19, which contains a fluid that has been heated by either a chemical reaction or nuclear energy. In this case, the expanded air may be ejected directly into the atmosphere, Fig. 18 (not shown), or be returned to the engine for further use after passing through another heat-exchanger 48 in a transfer duct 49, in which heat-exchanger the air is cooled to prepare it for re-compression by the rotors. Some of the compressed air may be bled-off through a pipe (52), Fig. 20 (not shown), for use elsewhere. A proportion of the air undergoing compression may by-pass the latter stages of compression through a pipe (56), Fig. 21 (not shown), to modify the performance of the engine, said pipe being connected to a transfer duct 123 Fig. 19 by a valve (58).
Patent GB-1188936-A (GB)
Title: Obtaining Filaments from Polyamide Acid Salts
Inventor: BUCKLEY ALAN
IPC: D01F6/76
Filed: 1966-09-06
Abstract: 1,188,936. Producing filaments of polyamide acids or salts thereof. IMPERIAL CHEMICAL INDUSTRIES Ltd. 16 Aug., 1967 [6 Sept., 1966], No. 39805/66. Addition to 1,121,325. Heading B5B. Filaments of polyamide acids or salts thereof suitable for conversion into polyimide filaments are produced by spinning an aqueous solution of an organic base salt of a polyamide acid as claimed in the parent Specification (wherein there is claimed an aqueous solution of a salt of a polyamide acid with a salt-forming organic base present in at least the stoichiometric amount required to neutralize all the free carboxylic acid groups in the polyamide acid) into an aqueous or a water-miscible coagulant bath which chemically interacts with the organic base salt to regenerate the polyamide acid or otherwise convert the salt into an insoluble form and withdrawing from the coagulant bath a coherent filament. The spinning solution may be a solution of a trialkylamine salt of the polyamide derived from pyromellitic dianhydride and a diamine of the general formula wherein X is a divalent bridging group or a divalent atom such as O or S and the phenyl groups are further substituted or are unsubstituted. The coagulant bath may be an acid solution and the spun salt may be converted into the free polyamide acid. The filaments produced may be subjected to thermal imidization under a tension not exceeding 0À5 gm./ denier, preferably less than 0À2 gram denier, the filament thereafter optionally being hot drawn. Conversion techniques and methods of processing filaments of polyimide precursors are described in Specification 1,038,738. The solutes in the coagulation bath may be hydrochloric acid, trichloracetic acid, calcium hydroxide, calcium chloride, ferric chloride, silver nitrate or metal chelates. The solvents for the solutes may be lower molecular weight monohydric alcohols, e.g. methanol, and lower molecular weight esters, e.g. ethyl acetate. The preferred coagulant bath is an aqueous methanolic solution of hydrochloric acid. Preferred amongst organic bases are trialkylamines, especially triethyl- and trimethylamine. In an example, an 80 gm. /litre solution of the triethylamine salt of the polyamide acid derived from 4,4<SP>1</SP>-diaminodiphenyl ether and pyromellitic acid dianhydride in equal volumes of water and isopropanol is extruded into a 3À5% V./V. solution of concentrated hydrochloric acid in water maintained at 10 C. Draw-down in the coagulant bath is between 1À3 and 2À0 x. The as-spun filament, after washing with aqueous methanol to remove residual coagulant, is dried in air at 100 C. and then heated at 300 C. in the absence of imposed tension to convert the polyamide acid into the polyimide. The polyimide filament is drawn at a draw ratio of 1À5 over a curved heated plate held at 550 C.
Patent GB-1129579-A (GB)
Title: Improvements in band saws
IPC: B23D57/00
Filed: 1967-08-31
Abstract: 1,129,579. Sawing. METABOWERKE CLOSS, RAUCH & SCHNIZLER K.G. 31 Aug., 1967 [22 Sept., 1966], No. 39854/67. Heading B5L. A band saw comprises a saw blade 26 guided over a plurality of rollers 4, 5, 6, and a carrier body 1 for the rollers consisting of sheet metal which is provided with conformations 2 for giving rigidity and at the same time constitutes a protective housing. The body 1 is pressed from sheet metal and the conformation consists of a deep bulge 2, a cover sheet 3 forming with the bulge a closed box. A guide roller 4 is mounted on a pivot 7 supported in the cover sheet and bulge, and a drive roller 6 is mounted on a bearing flange 9 and may be driven from an electric motor or portable drill. The tensioning roller 5 is mounted on a pivot 11 carried by a holder 12 adjustable by a screw 14 along a rod 13 mounted in the bulge 2. The holder can be rocked by adjustment of a screw 20 to tilt the roller 5 and adjust the tracking of the belt. A clamp 24 is provided for a rod 23 carrying a saw guide assembly 25 consisting of a pair of adjustable ball bearings. The body 1 is shaped to encompass the rollers and can be closed by a cover 34. Sheet metal feet 39, 40 support the band saw. A table 42 is mounted for adjustment into inclined positions.
Patent GB-910056-A (GB)
Title: Engine blast absorbing fence
Inventor: PHILLIPS EARL ALVIN
IPC: B64F1/26
Filed: 1960-11-21
Abstract: 910,056. Blast deflector fences. STANRAY CORPORATION. Nov. 21, 1960, No. 39921/60. Class 51 (2). A blast deflector and silencing fence for jet engines comprises inclined, perforated, prefabricated units arranged back-to-back so that part of the blast is diverted upwardly and part passes through the perforations, the units being made of single sheets 16 of metal having flanges 18 on two opposite sides and another base flange 28 by which the fence may be weighted or anchored to the ground. Each unit is formed with perforations 30<SP>1</SP> and may be bent along lines 24 and 26 as shown in Fig. 2 or may be of arcuate form, Fig. 4 (not shown). In a modification, Fig. 11, a single fence is supported by struts 51 and 52 secured to angle iron shoes 56. A baffle screen 57 is fixed at an angle to the fence on arms 58 passing through slots 60 and attached at 59 to the strut 51. The perforations here are limited to a few near the base of each unit. The baffle screen may be applied to a back-to-back unit, Fig. 13 (not shown), or may be omitted, Fig. 9 (not shown). The aggregate area of the perforations may reach up to 60% of the area of each unit.