baber/WOPTO huggingface dataset:
Patent GB-1293652-A (GB)
Title: Pulse width modulated bridge power amplifier protection circuit
IPC: H02P7/29
Filed: 1970-02-17
Abstract: 1293652 Protective arrangements GENERAL ELECTRIC CO 17 Feb 1970 [24 Feb 1969] 7563/70 Heading H2K A protective arrangement for a pulse-width modulated bridge power amplifier supplying a load 11, e.g. a motor, comprises current sensing means 81 connected in series with the power switching devices, e.g. transistors 12 ... 15 of the amplifier, a circuit for amplifying the signal from the means 81, a gate controlled device 67 controlled by the amplified output signal and means 71a ... 71d 72a ... 72d connecting the device 67 to the control circuits of the switching devices to turn off all the switching devices simultaneously when the gate controlled device 67 is rendered conducting on the occurrence of an overload condition. In the arrangement shown, a short circuit due to a defective transistor 12 ... 15 produces a voltage across a resistor 81 to cause a Schmitt trigger 83 to change its state to apply a signal through a diode 84 of an OR-gate to a transistor 61 in a threshold detector circuit. When the voltage applied to the base of the transistor 61 exceeds a level determined by a zener diode 66, the transistor conducts to render the silicon controlled rectifier 67 conductive. The motor 11 may be protected against an excess average current by a resistor 82 connected in series with the motor in the bridge diagonal. An amplifier 85 is connected across the resistor 82 and has its output connected directly to a diode 86 of the OR-gate and indirectly through an inverting amplifier 87 to a diode 88 of the OR- gate. This enables protection to be obtained for both directions of rotation of the motor. In an alternative arrangement, Fig. 2 (not shown) two diodes of the OR gate are connected through separate amplifiers to two-current sensing resistors connected in series with the power transistors 13, 15 respectively.
Patent GB-569384-A (GB)
Title: Stabilization of polyvinyl acetal
IPC: C08K5/315
Filed: 1943-05-13
Abstract: Polyvinyl acetal compositions are stabilized to heat by incorporation therein of from 0.5-10.0 per cent by weight of the resin of cyanamide or dicyandiamide.  Specified polyvinyl acetal resins are the acetal, propional and butyral.  Films based on polyvinyl acetal resins may be stabilized to heat by the use of these stabilizers.  Examples are given.
Patent GB-483602-A (GB)
Title: Improvements in band-pass selector systems for radio reception and the like
IPC: H03G5/26
Filed: 1937-03-16
Abstract: 483,602. Valve circuits for wireless reception. HAZELTINE CORPORATION. March 16, 1937, No. 7702. Convention date, March 21, 1936. [Class 40 (v)] A band-pass selector comprises input and output tuned circuits coupled both forward and backward by directive coupling means, e.g. thermionic valves to give a coupling which is degenerative at, and regenerative above and below the resonant frequency. The Figure shows a band-pass selector that may be used between the frequency changer and the intermediate frequency amplifier of a superheterodyne receiver. The input and output circuits 23, 24 are coupled in the forward direction by resistance coupled valves 25, 26 and in the backward direction by a valve 34, which produces a degenerative feedback at resonance, but at frequencies above and below this frequency the feedback is regenerative due to the phase displacements in the circuits 23, 24. The amount of feedback is controlled by the bias of valve 34 and the gain by the bias of the valves 25, 26. In a modification, Fig. 4 (not shown), a single valve is used in the forward direction and a pair of valves in cascade resistance coupled for the feedback. In a further modification, Fig. 5 (not shown), single valves are employed in each direction and the necessary 180‹ phase displacement is obtained by the use of transformer couplings to the circuits 23, 24. Specifications 392,411 and 442,685 are referred to.
Patent GB-347400-A (GB)
Title: Improvements in tubular containers for liquid and plastic substances
IPC: B65D35/12
Filed: 1930-03-10
Abstract: 347,400. Collapsable tubes. RADO, L., 10, Bismarokstrasse, Wannsee, Berlin. March 10, 1930, No. 7721. Convention date, March 20, 1929. [Class 11.] In a collapsable tube, in which the tubular portion d is non - metallic, the metallic head is formed in two parts b, c, which clamp the end d, of the tubular portion d between them, and the ends are folded strongly several times. The ends of the inner part c and the tube d may be folded round the end of the outer part b as shown in the Figure, or the ends of the outer part band the tube d may be folded round the end of the inner part c. Alternatively, the ends of the parts b, d may be folded round a separate ring, which is embedded completely in the turned-over edge.
Patent GB-1382168-A (GB)
Title: Fixing device for an oscillatory crystal and oscillatory crystal equipped with such a device
IPC: H03H9/05
Filed: 1972-02-18
Abstract: 1382168 Mounting piezoelectric flexural resonators COMPAGNIE D'ELECTRONIQUE ET DE PIEZO-ELECTIZICITE 18 Feb 1972 19 Feb 1971] 7721/72 Heading HIE  The fixing points from which a piezoelectric (e.g. quartz) flexural bar is suspended are not opposite one another, but lie on a line oblique to the axis of the bar. As shown in Fig. 4, the bar (of which one end only is depicted) is suspended from two pairs of wires 4, 4 attached at points A<SP>1</SP> 1 , A<SP>1</SP> 2  which lie at the intersection of nodal line D<SP>1</SP> with the two faces of the bar parallel to the plane of flexure. The nodal line D<SP>1</SP> makes an angle with the normal not greater than 20 degrees, the angle being determined by the crystallographic cut of the bar and by the aspect ratio of the rectangular cross-section. In one embodiment, the fixing points A 1 , A 2  lying at the intersection of line D with the centre line of the fixing faces are used. The line D intersects the axis of symmetry at point B which lies at a distance from the nearest end face of between 0À2 and 0À224 times the length of the bar. The Specification shows graphically the relation between the angle α and the aspect ratio of the cross-section. It is stated that the angle # between the line joining the alternative pairs of fixing points A and A<SP>1</SP> and the centre line of the fixing face must lie between 30 and 60 degrees
Patent GB-309572-A (GB)
IPC: F23K3/00
Filed: 1929-03-09
Abstract: 309,572. Peabody Engineering Corporation, (Assignees of Dyer, H. T.). April 14, 1928, [Convention date]. Pneumatic conveyers.-In air-current apparatus for supplying'pulverulent fuel to a plurality of furnaces, uniform distribution of the fuel particles throughout the air current is obtained by injecting, into the moving stream, jets of high pressure air. Fig. 1 shows the invention applied to the feeding of pulverized fuel to the burners H of a steam boiler I, the fuel being supplied to the burner pipes G through a distributor F which is in communication with the 'pulverizer B and fan D and to which the high pressure air is supplied by a fan K. As shown in Fig. 2, the conduit 1 is surrounded by a jacket 5 to which the fan K delivers air through a tangential pipe 7, this air entering the moving stream of fuel and air through tangential passages 4. In a modification, the jacket 5 is omitted and two pipes 7 deliver tangentially into an enlargement of the pipe 1. The passages 4 may be arranged to deliver jets upwardly into the pipe 1 or they may be constituted by a series of radial slots disposed helically around the pipe, Fig. 8 shows a further modification in which the high pressure air is injected into the pipe 1 through an axially arranged spray-nozzle 13. According to the Specification as open to inspection under Sect. 91 (3) (a) the invention is applicable to conveying pulverulent material in general. This subject-matter does not appear in the Specification as accepted.
Patent GB-1105352-A (GB)
Title: Improvements in or relating to heel-shaping machines
IPC: A43D21/12
Filed: 1966-02-22
Abstract: 1,105,352. Boots &C. H. WILISCH. 22 Feb., 1966 [19 Oct., 1965], No. 7760/66. Heading A3B. A machine for shaping the heel end of a shoe upper consists of a heated heel form 2, an inflatable outer form 7 and a pair of heated wipers 4 which are actuated by the movement of the outer form 7 and which, when closed, do not project beyond the edge of the heel form 2 so that the outer form 7 is free to contact the shoe upper. The heel form 2 is mounted on a support 3 and the upper 12 is held in position on the form 2 by clamps 1. The wipers 4 are mounted on a carriage 5 on a guide rod 10 which is slidable in a tube 11 on the outer form 7. Forward movement, of the outer form 7 under the action of piston and cylinder 9 causes the carriage 5 to move into position under the heel form, further movement of the outer form 7 causing the spring 17 to be compressed. During this movement projections 6 on the front edge of the outer form 7 engage the wipers 4 to close them and the wipers are pressed against the bottom of the form 2 by spring loaded members 15. After a predetermined time the members 15 are retracted by pneumatic means 18, the outer form 7 is retracted and the wipers 4 open under the influence of springs, the springs being used as leads for the heating current for the wipers.
Patent GB-589713-A (GB)
Title: Improvements in or relating to current transformers
IPC: H01F38/32
Filed: 1945-03-27
Abstract: 589,713. Transformers. MASCHINENFABRIK OERLIKON. March 27,1945, Nos. 7762 and 7763. Convention dates, April 22, 1944, and Aug. 31, 1944. [Class 38 (ii)] In a differential protective arrangement for a transformer with a variable transformation ratio, a main current transformer feeds the two primaries of an auxiliary current transformer which have different numbers of turns, through variable choke coils, so that the transformation ratios of the current and protected transformers may vary in inverse proportion. Fig. 1 shows two unequal primary windings 3, 4 of an auxiliary current transformer 2 connected in parallel to the secondary of a main current transformer 2 connected in parallel to the secondary of a main current transformer 1 through two variable chokes 5, 6 having movable cores. These cores' are moved in opposite directions by mechanism 7 upon movement of the tap changing switch 8 of the protected transformer, and it is shown that the transformation ratio of the current transformers is thereby varied. In the modification showh in Fig. 4, the inductance of the chokes is varied by the rotation of a short-circuited winding 17 which has variable coupling with the two chokes 15, 16 placed mutually at 90 degrees. The auxiliary transformer 2 may, in both cases, be an auto-transformer with the chokes 5, 6 connected to different tappings, Figs. 3, 5 (not shown).
Patent GB-196775-A (GB)
Title: Improvements in or relating to electrical switch gear of the "truck" type or the like
IPC: H02B11/24
Filed: 1922-03-16
Abstract: 196,775. Park Royal Engineering Works, Ltd., and Davis, W. J. March 16, 1922. Sliding switch-carriage arrangements.-Relates to switchgear of the truck type in which a movable shutter, actuated by the movement of the truck, protects the live contacts. Each row of live contacts is covered by a hood 7 of semi - cylindrical shape having end pieces 12 and holes 8 opposite the contacts, and the holes 8 are adapted to be covered by a movable shutter 9 having end pieces 10 pivoted to the end pieces 12 at 11. When the truck is moved to the right, Fig. 3, a roller carried by the truck engages a helical blade 24 on a shaft 26 and causes the latter to rotate. The motion is transmitted through a crank 27 to a rod 13 and thence to a crank 16 and spindle 17 associated with each row of contacts. Rotation of the spindle 17 causes the shutter 9 to rotate and uncover the openings 8, either through an intermediate bent lever 19, Fig. 2, or through bevel gearing, Fig. 6. When the truck is moved out of contact, the weight of the rod 13 causes the shutters 9 automatically to close. To prevent unauthorized actuation, the helical blade 24 may be covered by a hood having a slot in it for the passage of the roller.
Patent GB-989241-A (GB)
Title: Electric discharge lamps
Inventor: VAUSE ARTHUR SAMUEL
IPC: H01J61/54
Filed: 1960-03-04
Abstract: 989,241. Discharge lamps. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Feb. 16, 1961 [March 4, 1960], No. 7796/60. Heading H1D. A low pressure metal vapour discharge lamp, e.g. of the fluorescent type or sodium vapour type, has a resistive conductor or conductors each continuously secured, along substantially its whole length, to the outer surface of the lamp envelope, the conductor or conductors being connected in series with the main discharge path within the lamp envelope and having a resistance so selected as to limit the main discharge current to the desired value, so acting as a ballast resistor when the lamp is connected to a suitable source by way of two terminals on the lamp, whereby in normal use the heat generated in the ballast resistor passes readily into the lamp. In the construction shown in Fig. 1, the two terminals are located at one end of the lamp and one zig-zag resistive conductor 5 is connected at its opposite ends respectively to one of the terminals and to an electrode 3, the other terminal being connected to a second electrode 2. The electrodes 2, 3 are connected by a conductor 7 through a starting switch 6. In the construction shown in Fig. 2 the two terminals are located intermediate the ends of the lamp and two resistive conductors 5<SP>1</SP>, 511 are used. In the construction shown in Fig. 3, the starting switch 6 and the conductor 7 are omitted and a conducting stripe 8 on the internal surface of the lamp envelope is connected to the electrode 2 and extends to the region of the electrode 3. The resistive conductors can be in the form of wires or strips of nickel-chromium alloy, or in the form of film electrolytically or vacuum deposited on the surface of the lamp envelope and coated with insulation. A coating of highly reflecting material such as titania can be provided over the internal surface of the lamp envelope in the region where the resistance conductor is located, the coating underlying that of the fluorescent material where provided.
Patent GB-806059-A (GB)
Title: Improvements relating to flame cutting apparatus for the preparation of metal platesfor welding
Inventor: PUTTICK ALFRED
IPC: B23K7/00
Filed: 1956-03-13
Abstract: 806,059. Cutting by fusion. WHESSOE Ltd. June 13, 1957 [March 13, 1956], No. 7803/56. Class 83 (4). Apparatus for preparing an edge of a metal plate 4 for subsequent welding comprising a head 5 movable along the line of cut and carrying at least one flame-cutting nozzle 2 and its holder 23 non-adjustably mounted on the head for cutting a bevel on the edge but removable as a unit from the head. The apparatus preferably has upper and lower bevel cutting nozzles 2, 3 and a vertical nose-cutting nozzle 1, arranged as described in Specification 718,060. The nozzles are mounted in clamps 15, 18 secured to the head by screws 17 and located by keys and dowels 16, 16a. The nozzle holders may be rotated about their axes after slackening their clamping nuts 24. The vertical nozzle 1 is adjustable transversely to the line of cut by a micrometer screw 20, Fig. 3 (not shown), and is secured by a clamping nut. The head is carried on parallel pivoted links 7, 8, Fig. 1, from a moving arm 6. A counterweight 13 biases the head upwardly whereby one or more wheels 14 carried thereby ride along the underside of the plate as described in Specification 744,824. A screw 28 provides adjustment of the height of the head and its nozzles relatively to the plate and a screw 29 locks it in the adjusted position. Alternatively a single wheel may run on the top of the plate. A template may be used for setting the height of the head.
Patent GB-1242337-A (GB)
Title: A rotor/propeller for a convertiplane
IPC: B64C29/00
Filed: 1969-02-13
Abstract: 1,242,337. Convertiplane with propeller rotor folding in flight. UNITED AIRCRAFT CORP. 13 Feb., 1969 [20 March, 1968], No. 7805/69. Heading B7W. A convertiplane 10 is capable of operation as a helicopter with conventional cyclic and collective pitch control and as a propeller plane, Fig. 2 (not shown), and further the propeller mode may be converted to a fixed wing jet mode, Fig. 3 (not shown), by folding the propellers 20, 22 in flight, their pitch being changed by an independent pitch change arrangement 200, Fig. 4, so that they nest with respective nacelles 34, 36. Each blade 40 is carried in a corresponding sleeve 76 which has flanges 84 and 86 at the inboard end attached to a flange member 70 of the hub 50 by folding hinge pins 94 so that the blade and sleeve may be folded about axis 96. The blade and sleeve are normally held in position by lock pins 102, 104 which may be retracted from apertures 98, 100 by cranks 106; 108 to enable folding. The blade fold pitch change arrangement 200 includes a cam-follower 206, Fig. 5, attached to the blade spindle 72 and including a roller bearing member 208 which is received in a slot 210, Fig. 6, of a cam slotdefining member 212. During cyclic/collective pitch adjustment in flight, the cam follower roller 208 will move back and fore in a groove 222 of the slot 210. When the blades are to be folded in flight the convertiplane is first put into the propeller mode and then the rotor blades are put into fine pitch and stopped in the desired fold position with the help of a Vernier drive 232 and a brake 230, Fig. 5. Cam follower roller 208 at this point is at corner 226 of the slot 210. The slot pins 102, 104, Fig. 4, are then released and a blade folding motor 162, Fig. 5, is actuated to cause roller 208 to start moving along the portion 240 of slot 210. The conventional pitch change mechanism is then made ineffective and the roller runs along portion 240 of the groove thus keeping the blade feathered for the greater part of the folding and then turns into portion 244 which turns the blade into a suitable position to nest with the nacelle. It is preferable to have the pivot connection 144 between a pitch horn 150 and pitch control push rod 140 in alignment with the blade fold axis 96 when the blades are in their full feather position so that the conventional pitch control 131 does not interfere with blade fold pitch, arrangement 200 before the conventional control is inactivated. A construction having an articulated rotor which is capable of motion about both a lead-lag and a flapping axis is described with reference to Fig. 7 (not shown).
Patent GB-196258-A (GB)
Title: Process for the manufacture and production of chemically pure hydrochloric acid
IPC: C01B7/07
Filed: 1923-03-19
Abstract: Hydrochloric acid produced in the manufacture of chlorbenzene and other chlorinated organic substances, is purified by passing it over carbon or charcoal of high adsorption or decolorizing power, for example such as is prepared in the manner described in Specification 10126/14, [Class 55 (ii), Gas manufacture &c.]. Specification 156,543 also is referred to.ALSO:Hydrochloric acid produced in the manufacture of chlorbenzene and other chlorinated organic substances is purified by passing it over carbon or charcoal of high adsorption or decolorizing power for example such as is prepared in the manner described in Specification 10126/14, [Class 90, Non-metallic elements]. Specification 156,543, [Class 1 (i), Chemical processes &c.], also is referred to.
Patent GB-1071478-A (GB)
Title: Dinitroaniline derivatives and herbicidal compositions containing them
Inventor: SOPER QUENTIN FRANCIS
IPC: A01N33/18
Filed: 1965-02-23
Abstract: The invention relates to compounds of the general formula <FORM:1071478/C2/1> in which R is hydrogen, C1-C3 alkyl, C1-C3 haloalkyl, or halogen; and alk is a secondary C3-C7 alkyl group free from quaternary carbon atoms. Compounds claimed per se are: N-(sec.-butyl) - 2,6 - dinitro - 4 - trifluoromethylaniline, N - (2 - pentyl) - 2,6 - dinitro - 4 - trifluoromethylaniline, N - (3 - pentyl) - 2,6 - dinitro - 4-trifluoromethylaniline, N - (3 - pentyl) - 2,6-dinitro - p - toluidine, N - (3 - methyl - 2 - butyl)- 2,6 - dinitro - 4 - trifluoromethylaniline.  The compounds may be prepared by heating a primary amine of the formula H2N-alk with an aromatic halide of the general formula <FORM:1071478/C2/2> in the presence of a solvent and preferably in the presence of a strongly basic tertiary amine as hydrogen halide acceptor.ALSO:Herbicidal compositions comprise as active ingredients a compound of the general formula: <FORM:1071478/A5-A6/1> in which R is hydrogen, C1-C3 alkyl, C1-C3 haloalkyl, or halogen; and alk is a secondary C3-C7 alkyl group free from quaternary carbon atoms, together with solid or liquid carriers. Fertilisers may also be incorporated in the compositions.  Many examples of active ingredients are given.
Patent GB-1273509-A (GB)
Title: Wireline wiper
Inventor: READ NORMAN WELDON
IPC: E21B33/08
Filed: 1970-02-18
Abstract: 1,273,509. Wells. DRESSER INDUSTRIES, Inc. 18 Feb., 1970 [28 Feb., 1969], No. 7818/70. Heading E1F. A wiper assembly for a wireline 56 extending into a conduit disposed in an oil or gas well comprises a housing 12 connectible to the conduit, a wiper member 14 constructed from a resiliently deformable material, and a piston 16 having surfaces 42, and 44, 46 facing in opposite directions, exposed to fluid pressure in the conduit and of such areas that the force on the piston from the fluid in the conduit is substantially zero, or a force urging the piston into engagement with member 14. The piston being movable to deform the wiper member into engagement with the wireline. Bushings 48 are split, permitting the fluid in the conduit to engage surface 42. Pressure in chamber 30 moves the piston against the force of spring 38 to deform member 14. In a modification the inner surface of piston 16 is straight and the two ends of the piston are exposed to fluid in the conduit, the piston having a flange between its ends extending into chamber 30:
Patent GB-235962-A (GB)
Title: Improvements in or connected with gas holders
IPC: E04H7/06
Filed: 1924-03-27
Abstract: 235,962. Melbourne, R. J., and Cutler, S. March 27, 1924. Girders.-The tie-rods f for the crown framing of gas-holders, tanks, &c. consist for the whole or part of their lengths of two bars d<1> embracing the roof-trusses, the use of a shorter centre column e being thereby rendered possible and lateral deflection of the truss prevented. The tie-rods may be fitted with screw couplings for adjustment purposes.
Patent GB-828246-A (GB)
Title: Improvements in or relating to chairs
Inventor: LEIGH DAVID WILLIAM
IPC: A47C1/124
Filed: 1957-03-11
Abstract: 828,246. Nesting chairs; fixing chairs together in rows. NEETA Ltd. Jan. 30, 1958 [March 11, 1957], No. 7962/57. Class 52(2) Tubular metal stacking chairs are each provided on one side with hook members 4 and on the other side with holes 3 into which can be fitted the hook members of an adjacent chair to prevent relative movement and facilitate the locking together of chairs in rows. In a modification, Fig. 4, the chair legs 6 are unconnected at their lower ends and hooks 4 and sockets 7 are welded to the legs.