baber/WOPTO huggingface dataset:
Patent GB-516935-A (GB)
Title: Improvements in electrical wave amplifying systems
IPC: H03F3/28
Filed: 1938-07-14
Abstract: 516,935. Valve amplifying circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. July 14, 1938, No. 20892. Convention date, July 14, 1937. [Class 40 (v)] In a class B amplifier means are provided to ensure balanced push-pull amplification and negative feedback is provided to reduce distortion. The means ensuring balanced amplification are preferably such as to reduce longitudinal signal transmission and may comprise negative feedback in a stage of the amplifier. Fig. 1 shows a high level modulating amplifier in which the halves of each of the push-pull stages are coupled by resistances 19, 35 and 56 respectively and by the modulation transformer 57 to preserve balance. The grid bias for the stage 1603 is sufficient to compensate for the positive voltage fed through the feedback connection from potentiometer 75, 76. The grid bias for the stage 807 is obtained from a tapping on resistance 35 through series resistance 33. The Specification gives a mathematical anlysis of the amount of coupling produced by the common resistances 19, 35 and 56 which reduce the gain for unbalanced voltages. The stage 845 comprises push-pull connected parallel pairs of valves provided with parasitic stopping resistances 54. Phase correction at high frequencies is effected by the combination 23, 25 and at low frequencies by the combinations 27, 28 and 45, 47. Alternatively a condenser or inductance or both together in shunt to part of the anode load may be used, Figs. 5, 7, 8 (not shown). The intervalve transformer has a ratio of 1.4 to 1 but is provided with taps to give a 1 to 1 ratio which are connected through large condensers 59 to the primary windings 55 so that at high frequencies it functions as an auto-transformer. A resistance 61 and condenser 63 are provided to correct phase at high frequencies. Fig. 2 shows a modification in which the condenser 63<1> shunts the leakage reactance of the transformer and further reduces phase shift. The output stage includes anti-parsistic surge-preventing resistances 81 in the anode circuit and a frequency correcting circuit 83, 85. The output is applied to a modulating choke 93 in series with the anode supply of the radio frequency amplifier. The output stage is biased practically to cut-off, indicated by meters A, and is preferably so operated as not to run into grid current. The feedback voltage taken from the frequency compensated potentiometer 75, 76 enables zero signal zero current Class B operation and removes the hum resulting from cathode heating with raw alternating current. The Specification gives values of components for 5 kW. air cooled amplifier. The condensers 77, 79 frequency compensating the potentiometer are made sufficiently large not to be affected by stray circuit capacities and sufficiently small not to affect the output impedance of the amplifier. The feedback control includes the direct current component and is taken through a screened cable. Specification 443,684, is referred to.
Patent GB-531833-A (GB)
Title: Improvements in or relating to devices for springing cartridge extractors in firearms
IPC: F41A15/14
Filed: 1939-07-18
Abstract: 531,833. Firearms. CESKOSLOVENSKA ZBROJOVKA A'KCIOVA SPOLECNOST BRNO. July 18, 1939, No. 20913. Convention date, July 21, 1938. [Class 119] A cartridge-extractor spring resting at one end on the extractor and at the other end on the breech-block or an intermediate member is formed, at that end resting on the extractor, with a slot for the insertion of a removal tool such as a bullet. In the form described, the spring 3 comprises a U-bend of drawn wire, the bend 3<SP>1</SP> resting in a recess 7 formed in the top of the extractor 2 and the two ends being inserted in bores 5 in the breech-block 1.
Patent GB-814990-A (GB)
Title: Improved means for producing surface finish in the bore of tubes or cylinders
Inventor: LINES ERNEST WILLIAM POOLE
IPC: B24D9/02
Filed: 1956-07-06
Abstract: 814,990. Internal grinding and polishing. UNIVERSAL STEEL TUBE CO. Ltd. July 8, 1957 [July 6, 1956], No. 20939/56. Class 60. Means for polishing the bore of a tube comprises a layer of fabric 7 supported around a number of radially expansible rubber elements 5 which are mounted on a shaft 3 and expanded by a wing-nut 6 in order to urge the polishing agent into uniform contact with the tube. A supporting head 3a is formed at one end of the shaft and the elements 5 are separated by spacing discs 4. The shaft and corresponding aperture in the elements may be of square cross-section in order to prevent rotation of the elements relative to the shaft during the polishing operation. The Provisional Specification describes the layer of fabric as being in the form of a continuous sleeve.
Patent GB-858117-A (GB)
Title: Improvements in and relating to electric resistors
Inventor: BOLTON ERIC
IPC: H01C7/18
Filed: 1956-07-06
Abstract: 858,117. Resistors. ENGLISH ELECTRIC CO. Ltd. July 3, 1957 [July 6, 1956], No. 20966/56. Class 37 A number of solid resistor elements are arranged alternately with insulating barriers and with connectors between adjacent elements staggered to provide a tortous current path. The resistance elements are preferably of carbonceramic composition with metallized contact faces. Insulating barriers are preferably of thermosetting synthetic resin. Figs. 1, 3 show elements 10 in the form of interrupted rings having metallized contact faces 11 on opposite sides and interspaced by insulating barriers 12 of similar form but having H-cross-section. A sector shaped hole is provided in each barrier 12 to receive a brass connector 15. One side of each element 10 is supported at three points by two projections 18 in the web of the H-section and by one end of a connector 15. The assembly is clamped together to form a non-inductive resistor by brass contact discs 19, 20 and terminals carried by an insulating rod 16. Insulating spacers 17 and a spring 24 are also provided. A terminal 26 screwed through a hole in one of the barriers into one of the connectors 15 provides a tap. In another embodiment Figs. 5, 6 (not shown) the elements have horseshoe form with metallized end faces alternately connected by spring contacts. In Fig. 7, rectangular elements 31 having opposite ends 32 metallized are arranged alternately with flanged barriers 33 in a laminated paper tube 37. Spring connectors 35 pass through holes in each barrier 33. End connections are made by I-shaped contacts 40 co-operating with smaller springs 42. Metal end caps may form terminals for the complete assembly, or, as shown, terminal 44 may be carried by insulating end caps. A tap is provided at 45. The complete assembly may be embedded in material known by the (Registered Trade Mark) "Araldite".
Patent GB-397294-A (GB)
Title: Improvements in or relating to bobbin skewers and like bobbin carriers or supports
IPC: B65H49/26
Filed: 1932-07-25
Abstract: 397,294. Bobbin skewers. HUTCHINGS, F. and FINE COTTON SPINNERS' & DOUBLERS' ASSOCIATION, Ltd., St. James's Square, Manchester. July 25, 1932, No. 20969. [Class 120 (ii).] Bobbin skewers or like bobbin supports are tipped at the lower end with a bearing surface 12 of a known material or alloy of the self-lubricating type, such as a bronze alloy with which graphite has been incorporated. The tip is preferably formed by diecasting, oil being used in the process. The anti-friction element 12 is preferably held in a stiffening element 11, and is rounded as shown.
Patent GB-220805-A (GB)
Title: Improvements relating to intermittent driving-mechanism for feeding continuous strip material
IPC: B65B41/16
Filed: 1923-08-18
Abstract: 220,805. Forgrove Machinery Co., Ltd., and Grover, F. Aug. 18, 1923. Feeding webs.-In mechanism for feeding a web of waxed paper or other material to a cutting- device in a wrapping or other machine, of the kind in which a pair of feed-rollers 10 is operated by a friction ratchet gear such as a notched pawl 3 engaging an annular flange 1<x> on a wheel 1 geared to the rollers, means are provided to impart a slight backward rotation to the feed-rollers towards the end of the idle stroke of the pawl, to detach the web from the cutting blade if it should adhere thereto. Two arms 15, 16 pivoted on a pin 14 are provided with leather or other friction shoes 15<x>, 16<x> held in contact with the opposite faces of the wheel 1 by a spring 19 on a rod 20 secured to the arm 16 and passing through the arm 15. A projection 17 on the arm 16 carries an adjustable stop 18 adapted to be engaged by a projection 8<x> on the boss 4 carrying the pawl 3, towards the end of the idle stroke of the pawl, so that the wheel 1 is turned slightly in a direction to cause the feed rollers 10 to draw the web back from the stationary cutter 12<x>. The arms 15, 16 are normally held against a stop 22 by a spring 21. sufficiently strong to prevent movement of thewheel 1 by the pawl 3 during its idle stroke.
Patent GB-313787-A (GB)
Title: Bolt anchor
IPC: F16B13/06
Filed: 1928-07-19
Abstract: 313,787. Kempton, A. K. July 19, 1928. Screw sockets. - A bolt anchor comprises a wedge-shaped sleeve 4 which co-operates with a V-slotted sleeve 2 of soft metal caulked into the hole in the masonry. The wedge-sleeve 4 may be threaded to engage the bolt thread or the bolt may be retained by its head 5.
Patent GB-806279-A (GB)
Title: Method of and means for topping-up projectiles, anti-tank mines or like explosive devices with molten explosive
IPC: F42B33/02
Filed: 1957-07-03
Abstract: 806,279. Explosives. BOFORS A. B. July 3, 1957 [Aug. 24, 1956], No. 21030/57. Class 9(2) Apparatus for topping - up projectiles, anti-tank mines and like explosive devices with molten explosive comprises a heatemitting part 3 adapted for the flow therethrough of a heating fluid and having guide fins 4 extending outwardly therefrom so that when the heat-emitting part is placed in a funnel-member 2 in the aperture of the explosive device 1 molten explosive can flow freely from the funnel into the explosive device. The heatemitting part 3 may be in the form of a tube closed at its lower end and connected to a conduit 5. A separating wall 6 may be provided to ensure continuous flow of the heating fluid which may be steam or hot water. A series of devices may be connected together on racks so that the heat-emitting parts are connected together in series.
Patent GB-1019661-A (GB)
Title: Improvements in or relating to mattresses
Inventor: MILTON WILLIAM FRANK
IPC: A47C27/14
Filed: 1961-06-12
Abstract: 1,019,661. Mattresses. PRICE BROS. & CO. Ltd. June 7, 1962 [June 12, 1961], No. 21126/61. Heading A4M. A mattress has a filling of plastic foam enclosed in an envelope of or having its surface covered by nylon or other manmade fibre and a ticking.
Patent GB-154681-A (GB)
Title: Improvements in or relating to racks employed in connection with the manufacture of boots and shoes
IPC: A43D117/00
Filed: 1919-08-28
Abstract: 154,681. Ingham, W. Aug. 28, 1919. Shelves and shelf fittings. - A movable rack for draining soles, in the manufacture of boots and shoes, comprises a series of reticulated shelves 2 removably supported on hooks 4 on the sidebars 5 of a frame mounted on castors. Each shelf consists of wire netting stretched over a wire frame 3. A trough 6 is removably fitted in the, bottom of the rack, or a trough may be provided under each shelf. A " cage," having upright bars 10, may be removably placed on each shelf, to separate soles s of different sizes.
Patent GB-1022232-A (GB)
Title: Improvements in filters for air and other gases
IPC: B01D46/52
Filed: 1961-06-12
Abstract: 1,022,232. Filters for gases. CLARKE, CHAPMAN & CO. Ltd., and T. THOMPSON. June 7, 1962 [June 12, 1961], No. 21159/61. Heading BIT. A gas filter comprises an inert porous fabric 1, e.g. glass fibre fabric or cellulose fibre sheet, folded to present a plurality of substantially parallel walls 2 interconnected by U-bends 3, the walls being separated by spacing means 4, preferably made of a sheet of stiff paper, paperboard or thin aluminium folded on parallel lines in angular zig-zag form, the spacing means having substantially line or point contacts with the filter fabric 1, the outer walls 2a and 2b of the filter unit thus produced being secured by adhesion to inner surfaces of two lateral frame elements 8 and opposite ends of the filter unit being bedded in a sealing substance 12 and 18 each within one of two opposed tray-like, transverse frame elements 13, 17, portions of the latter abutting the ends of the lateral elements 8. The faces of the filter unit are covered with expanded metal 11 secured within flanges 9 of the elements 8. The elements 8, 13 and 17 are preferably made of aluminium ; alternatively, they may be made of glass fibre fabric laminated with a polyester resin or of steel. The sealing substance 12 and 18 is resistant after setting to heat and corrosion ; the substance may be neoprene, silicone rubber, epoxy resin or a bituminous or thermoplastic compound. To enable the sealing substance to permeate the glass fibre fabric 1 the ends of the latter are first dipped in a low viscosity mixture of a resin with catalyst and accelerator, which requires curing by heat. Thereafter the dipped ends are inserted into a resin mixture sealing substance contained in the elements 13, 17, the mixture being thickened with a relatively high proportion of fillers to a treacly consistency and being selfcuring to the solid state at room temperature and exothermally, so as simultaneously to effect a curing of the low viscosity resin mixture within the interstices of the glass fibre fabric 1. The spacing means 4 may in this construction be asbestos. The filter may be housed in a casing, Fig. 3 (not shown), which is mounted in an aperture in a wall or ceiling and is connected to exhaust trunking; alternatively the filter may be secured between two portions of ducting.
Patent GB-375584-A (GB)
Title: Method of recording sound
IPC: G11B5/00
Filed: 1931-07-24
Abstract: 375,584. Recording sound in association with kinematography. BARON, H., 231, Strand, London.-(Rhythmographie Ges.; 133, Alte Jacobstrasse, Berlin.) July 24, 1931, No. 21199. [Class 40 (ii).] Relates to methods of recording sound in association with motion-pictures, in which a "rhythm band " or the like, such as is described in Specification 345,278, is used. According to the invention, a rhythm band or equivalent (such as a rotating disc with spirally arranged indications thereon) which indicates the sound sequences required to correspond with a given picture film, is first prepared. The rhythm band &c. is moved at a uniform speed, and a kinematographic record of the moving band is made on a film. This is run through an ordinary projector when the sound record is to be made, the artists producing the sounds being guided by watching on a screen the projected image of the moving rhythm band instead of observing the rhythm band itself.
Patent GB-1337861-A (GB)
Title: Hydraulic energy absorber
IPC: F16D55/02
Filed: 1971-04-19
Abstract: 1337861 Hydrodynamic retarders BORGS FABRIKS AB 19 April 1971 [26 Feb 1970] 21230/71 Heading F2E In a hydrodynamic retarder having a rotor and stator with oppositely curved blades 9, 10, fluid returns from the stator to the rotor via a form of vortex and a small amount of the fluid passes through equal pressure channels defined by vanes 15 to combine with the remainder of the fluid at the rotor inlet. The vortex increases the tangential component of the fluid to increase torque, and the equal pressure fluid raises the static pressure of the vortex fluid to avoid cavitation. The retarder is used in an aircraft arrestor, and the rotor shaft 8 is coupled to a winding drum 4 upon which is wound the aircraft arresting wire. The retarding torque is aided at low speeds of rotation by a pump 17, coupled to the rotor shaft 8, pumping fluid into an accumulator 21.
Patent GB-316664-A (GB)
Title: Improvements relating to mixtures of nitrate of ammonia and nitrate of lime
IPC: C05C13/00
Filed: 1929-07-11
Abstract: 316,664. Appareils et Evaporateurs Kestner. Aug. 2, 1928, [Convention date]. Manures.- To obtain a non-deliquescent mixture of nitrate of lime and nitrate of ammonia, the nitrate of lime is before admixture concentrated so that it contains only 18 per cent of water.
Patent GB-1244261-A (GB)
Title: A method of stranding together a plurality of elongated elements
IPC: H01B13/02
Filed: 1969-04-25
Abstract: 1,244,261. S-Z twisting. SIEMENS A.G. 25 April, 1969 [21 May, 1968], No. 21371/69. Heading D1T. [Also in Divisions B3 and H1] Pairs or quads 2 are stranded together to form a communications cable having alternate sections of S and Z twist by drawing them through a die 9 which forms them into a group 1, through a twisting device 4 which presses on the group and rotates about the axis thereof, and to a rotating take-up drum 5, the distance a between the die 9 and the mid-point of the twisting device 4 being greater than the distance b between the mid-point of the twisting device 4 and the drum 5, there being a plurality of complete 360 twists in any length a + b of the resultant cable, and each section of one direction of twist having a length of at least b but not more than 3a. In place of the take-up drum, several cables 1 may pass to a die whereafter they are twisted together to form a larger cable (Fig. 3, not shown). The ratio a:b is preferably at least 5. The twisting device may be intermittently driven in one direction or its direction of rotation may be periodically reversed. The device may also be moved during twisting to vary the ratio a:b. The speed of the twisting device may be varied to give a uniform lay throughout a section. More than one twisting device 4 may act on the cable between the die 9 and the drum 5, the devices rotating in the same directions at speeds which increase with their distance from the die 9. Various suitable twisting devices are described (Figs. 5 to 8, not shown).
Patent GB-1106791-A (GB)
Title: Improvements in devices for limiting the slipping of vehicle wheels during brake applications
IPC: B60T8/40
Filed: 1965-05-20
Abstract: 1,106,791. Fluid-pressure brakes. SOC. ANON. ANDRE CITROEN. 20 May, 1965 [22 May, 1964], No. 21494/65. Addition to 1,020,028. Heading F2F. In an improvement in the device for limiting the slipping of the wheels of a vehicle during a brake application as claimed in Specification 1,020,028 a valve 20 having its slide member 21 responsive to the difference in pressure between the suction and delivery side of a pump 16 driven from one of the rear wheels 13g is connected to the fluid circuit 25 feeding the brake cylinder 12g of the wheel 13g, whereby when the pressure differential is different to a predetermined value that section of the circuit which feeds the brake cylinder 12g of that particular wheel is connected to a return line leading to a fluid reservoir (not shown). _
Patent GB-433170-A (GB)
Title: Improvements relating to draught regulators, flue dampers and the like, particularlyfor incubators
IPC: A01K41/02
Filed: 1934-07-23
Abstract: 433,170. Thermostats. SALMON, J. T., Greenlane Farm, Shamley Green, Guildford, Surrey. July 23, 1934, No. 21519. [Class 135] In a thermostatic draught regulator, particularly applicable to incubators, two sheetmetal flaps 1 are pivoted on a common pin 2 and connected by rods 4 to a ring 5 which is connected to a rod 27 actuated by a thermostat 24. The pin 2 is carried by a bar 6 weighted to retain its position, or it may be positively secured. The bar 6 may be recessed at 11 to provide an abutment for the flaps when closed. In an application to an incubator, an oil lamp 13 may be used to heat air in a passage 16 for admission to the chamber 18 at 21. The flaps 1 control the outlet 23 from the air passage. Alternatively, the flaps may control an opening in the top of the incubator.
Patent GB-712417-A (GB)
Title: Improvements in or relating to electric plug and socket connectors and to electric switchgear contactors, motor control gear and other electrical apparatus, embodying such connectors
IPC: H01R13/02
Filed: 1951-09-14
Abstract: 712,417. Two-part couplings. BROOKHIRST SWITCHGEAR, Ltd., and BUTTERWORTH, E. M. Aug. 26, 1952, [Sept. 14, 1951.] No. 21591/51. Class 38(I). A plug-and-socket connector, particularly for connecting together two parts of electrical apparatus, comprises a plug of bent metal strip 18 chamfered at one end, the other being screwed tc one part 11 of the apparatus and connected to a supply terminal 19. The socket is mounted on the other part 10 of the apparatus, and comprises a spring-urged ball or roller 15 held laterally by bosses 17 integral with the part 10, and held against the wall ioa by an outwardly-bent part 13 of a metal strip 12 connected to a supply terminal 14. The plug is inserted between the ball  15  and the wall 10a. The two parts 10,11 may be held together by a spring clip. In the application of the invention to contactor gear, the sockets are mounted on a panel carrying the main gear and the plugs on the casing in which the main gear is housed, Figs. 1, 2, (not shown).
Patent GB-300315-A (GB)
Title: Improvements in or relating to electric motors and in control systems therefor
IPC: B66C13/26
Filed: 1927-08-16
Abstract: 300,315. Miller, L., and Metropolitan- Vickers Electrical Co., Ltd. Aug. 16, 1927. Motors, controlling.-An electrically-controlled friction brake, especially applicable to alternating- current crane motors, comprises friction members normally held in or out of engagement by springs, one member rotating with the main motor shaft while the other, which is non- rotating, is controlled by a torque motor coaxial with and surrounding an extension of the main motor shaft. The torque motor may be energized in accordance with the main motor current for releasing the brake when this is normally applied and means may be provided for controlling the effect to obtain slow speeds of the main motor. In the form shown, the rotor 4 of the torque motor is carried by a hub 6 running on a fixed sleeve 3 secured to the casing of the main mctor 1 and surrounding the extension 2 of the shaft thereof. The stator 5 of the torque motor is also secured to the casing of the main motor. The rotating brake elements consist of rings 8 sliding on pins 9 in a spider 7 on the shaft 2 and engaging non-rotating members 10 which are mounted on rods 11 fixed to the motor casing. The outermost plate 10 is fixed by means of nuts 12, and the innermost one is normally urged towards it by springs 13 so that all the plates and interleaved friction material 20 give a braking action. The non-rotating ring 10 carries rigidly a number of guide rods 14, sliding in the frame member 16, and its boss 19 has a quick-pitch thread engaging the threaded end 17 of the hub 6 of the torque motor, thepitch being such as to allow the spring 13 normally to engage the braking surfaces. Thus, rotation of the torque motor in a selected direction frees the brake on the main motor. Levers or other mechanical alternatives may be employed in place of the screw. The connections are shown in Fig. 2 wherein the stator 2, 3 of the main motor is shown supplied from the line through adjustable resistances 24. The torque motor 25 is fed. through a tapped transformer 26 in series with the main motor. In the case of a crane motor, the torque motor is arranged so that the brake is released when the main motor is energized for hoisting the load or it is used on the first notches of the controller to obtain slow hoisting speeds by applying a retarding torque to the main motor. The brake may be so arranged that if the load rises above a predetermined value it is released somewhat and floats on and off, maintaining a constant speed, this being obtained, for instance, by arranging that one step only on either side of the main controller gives a floating action while on all other steps sufficient current is supplied to hold the brake out of action, this being affected lay connections in the controller which put the torque motor on a higher tap in the current transformer. The main and torque motor controllers may be separate or combined.