baber/WOPTO huggingface dataset:
Patent GB-844107-A (GB)
Title: Improvements in or relating to oscillators for high-frequency heating
IPC: H05B6/04
Filed: 1958-05-01
Abstract: 844,107. Valve oscillating circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. May 1, 1958 [May 1, 1957], No. 13931/58. Class 40(6). An oscillator for high frequency heating comprises a back coupled grid controlled oscillator valve with a pentode included in the D.C. circuit of the control grid to stabilize the grid current with varying load. A resistor is connected in parallel with the pentode and between its cathode and the control grid of the oscillator valve there is included a further resistor the end of which remote from the cathode of the pentode is connected to the control grid of the pentode via a path which includes a constant voltage means. In the embodiment shown a Colpitts oscillator has a valve 1, with a control grid D.C. circuit 13 which comprises a resistor 14 in parallel with a pentode 15, which has, in its cathode path, a variable resistor 16. The end of this resistor 16 is connected via a constant voltage device 18 and a resistor 28 to the control grid of the pentode. If, as a result of an increase in the oscillator load, the grid current of valve 1 falls the grid potential of the pentode will rise and hence its resistance will fall with the result that changes in grid current are counteracted. The resistance of circuit 13 is thus maximum at maximum grid current and decreases with increase in load on the oscillator. If the resistor 16 is adjusted so that the pentode is substantially cut off in the unloaded condition, the total grid current will then be substantially absorbed by the resistor 14. Fig. 2 (not shown) gives curves of the grid current absorbed by the pentode 15 and the resistor 14 individually and also the total grid current as functions of the load. As described, the screen grid potential of the pentode 15 is derived from a separate source 25 and in order to avoid undue increase in screen current when the anode voltage of pentode 15 ceases e.g. when the oscillator valve is switched off, the negative terminal of the source 25 is connected to the cathode of pentode 15 via resistor 26 and to its grid by resistor 27.
Patent GB-568107-A (GB)
Title: Improvements in and relating to attenuators for electric signalling systems
IPC: H01P1/22
Filed: 1943-08-26
Abstract: 568,107. Wave - guide attenuators. MALLARD RADIO VALVE CO., Ltd., and LATIMER, K. E. Aug. 26, 1943, No. 13949. [Classes 40 (iii) and 40 (v)] [Also in Group XXXVI] An adjustable attenuator comprises a tube formed from telescoping parts 6, 12 of different diameters, the lengths of the respective parts being adjustable by a rack and pinion without altering the distance between the input and output loops &c. 7, 8. Preferably, the output loop is adjustable also by a further rack and pinion to vary the effective length of the attenuator. In the application shown for measuring the Q of a cavity resonator, the latter is fed from a source 1 and is coupled through the attenuator to a diode coupled to a local oscillator on wire LO. The resultant currents are passed over WBA to a wide-band amplifier to control an indicator. The diode is housed in a, chamber 18, the cathode leads 19 being tuned by a piston 20. To make the test, current of the resonant frequency is applied to the resonator and the indicator reading is noted, the attenuator is adjusted to increase the current to #2 times its previous value and. the frequency is then varied to bring the indication down to its original value, the deviation of this frequency from the resonant frequency being 1/2Q of the resonant frequency.
Patent GB-973583-A (GB)
Title: Improvements in or relating to microwave aerials
Inventor: LEE JOHN LESLIE
IPC: H01Q17/00
Filed: 1962-04-11
Abstract: 973,583. Aerials. POSTMASTER GENERAL. April 11, 1963 [April 11, 1962], No. 14057/62. Heading H4A. In an aerial comprising a major reflector 1, Fig. 2, a minor reflector 2, and a feed device such as the conical horn 5 arranged substantially on the axis of symmetry of the aerial, the major reflector surface is generated by rotating a section of a parabola AB, Fig. 1, about the axis of symmetry XY of the aerial, which is parallel (but not coincident) with the axis m, n of the parabold, and the minor reflector surface is defined by the rotation about the aerial axis XY of a regular plane curve; this surface being so shaped and located as to produce a beam from the aerial which is of annular cross-section. The minor reflector surface may be a section of a hyperbola CD having one focus F2 coincident with that of the parabold and its second focus F1 lying on the aerial axis XY coincident with the phase centre of the feed device. With this arrangement the virtual source for the major reflector 1 is the circle formed by rotation of the focus F2 so that a parallel annular cross-section beam is reflected. Other suitable curves for generating the minor reflector surface are (i) an ellipse whose two foci are located similarly to those of the hyperbola CD, and (ii) the perpendicular bisector of a line joining the phase centre of the feed device to the focus F2 of the parabola. The minor reflector 2 may be supported from either the major reflector by a sheet or rods of dielectric material or from the feed device 5 by means such as the dielectric block 6. In the latter case the reflector 2 may be formed by spraying a metallic coating on to the end of the block 6. Various shapes of blocks are described with reference to Fig. 2 and Figs. 4, 7 and 8 (not shown) to provide emission of energy to the major reflector 1 as an equiphase front after reflection by the minor reflector 2, and waveabsorbing means 9 surrounding the reflector 2 may be used. Scanning in either a conical or spiral pattern, or arcuate movement of the beam in more than one plane, may be effected by movement (relative to the major reflector) of the feed device, the minor reflector, or both.
Patent GB-1219765-A (GB)
Title: Liquid fuel injection pumping apparatus
Inventor: NICOLLS WILFRED EDWARD WALTER
IPC: F02M41/14
Filed: 1967-03-28
Abstract: 1,219,765. Fuel injection pumps. C.A.V. Ltd. March 8, 1968 [March 28, 1967], No. 14061/67. Heading F1A. An injection piston 19 disposed in a bore 15 of a rotary distributor 11 is actuated hydraulically by liquid discharged from cylinder 12, until a passage 30 is uncovered. Discharge is through a spring-loaded valve 20 to distributor passage 17 and ports 18. During delivery the piston 19 engages and further opens the valve 20 so that at the end of delivery the valve 20 is held open to allow return flow from the ports 18. Return of the piston 19 is effected by feed pump pressure which is connected to the bore 15 on both sides of piston 19 through passages 22, 23 controlled by throttle 53.
Patent GB-118910-A (GB)
Title: An Improved Press, particularly for use in Operating upon the Flanges of Warp Beams and the like.
Inventor: ANDERTON JOHN
IPC: B21D1/00
Filed: 1917-09-29
Abstract: 118,910. Anderton, J., and Gregory, J. Sept. 29, 1917. Stamping.-Warp-beam and like flanges are repaired and straightened by a press consisting of a lower die b fixed on a table a and an upper die h taking over a screw e and forced down by a nut m provided with handles m'.. The upper surface of the die b tapers inwardly so as to form a depression, into which the central portion of the flange c is bent when the die h is forced down, thus straightening any kinks in the metal, the flange returning by its resilience to the flat condition when the pressure is removed. The under face of the upper die h has openings h<2> to receive any projections there may be on the flange. A washer or roller or ball bearing n is interposed between the nut m and the die h. The edge c<2> of the flange c may be straightened by inverting the flange on the die b, the edge b<2> of which is made acute-angled for this purpose.
Patent GB-943372-A (GB)
Title: Improvements in or relating to the trimming of cans
Inventor: COOTE ARTHUR THOMAS
IPC: B23D31/00
Filed: 1962-04-11
Abstract: 943,372. Milling; machine tool details; making cans. METAL CLOSURES GROUP Ltd. Sept. 11, 1962 [April 11, 1962], No. 14082/62. Headings B3A, B3B, B3C and B3T. [Also in Division B5] A machine for trimming a round, oval or rectangular can comprises a can holder, a saw to cut through the wall of the can at its mouth and an axially-movable cutter to trim the edge. The can of aluminium is initially formed by extrusion. A cam-shaft controls movements of a loading device 30, having an arm 36 and a shoot 35, a sawing unit 26 sliding on rods 41 and a milling unit 32, by way of push-rods and bell-crank linkage. The milling cutter 39, Fig. 6, has five blades 39a. Passing through the cutter is a stationary mandrel 49 to support the cam 100. The cans are held on an indexible turret, each can being clamped to a shaped metal or metal-filled resin support 54 by a twin-armed lever 53, Fig. 4. Each can is located by a stop 55 and the clamp carries a pivoted bar 56 carrying a work-engaging block 59 and a roller 58, the arm being normally urged by a spring 61 against a stop 60. The clamp is actuated by a fixed cam 63 contacting a plunger 62 engaging a stop 64. A finished can is ejected at an unloading station by air admitted through the hollow stop 55. The table is indexed to eight positions, every other position being an idle station to reduce wear and overshoot of the table.
Patent GB-183634-A (GB)
Title: Improvements in or relating to desks and like articles of furniture
IPC: A47B19/00
Filed: 1921-05-20
Abstract: 183,634. Humphreys, M. May 20, 1921. Desk frames; desks combined with or convertible into easels.-A box 10 on legs 11 has hinged at one end a lid 12 to the underside of which is pivoted a strut 15 adjusted to engage a rack 16 running along the bottom of the box at rightangles to the hinge of the lid. One or more shelves 17 are provided as shown. The lid may be used as a drawing-board or easel, a ledge 14 being fitted as a support for a sheet of paper &c. Specifications 2313/82, 2767/98, and 10403/08 are referred to.
Patent GB-696328-A (GB)
Title: Improvements in or relating to electronic apparatus
IPC: H03F1/54
Filed: 1951-06-14
Abstract: 696,328. Testing thermionic valves and valve circuits. GENERAL ELECTRIC CO., Ltd., and FLINT, F. C. June 13, 1952 [June 14, 1951], No. 14156/51. Class 37. The grid current of a valve is measured by means of a differential ammeter having one winding connected in the cathode circuit and the other winding in the anode circuit so as to measure the difference between the anode and cathode currents. A grounded-grid triode 1 for use at high-frequencies is incorporated in a coaxial line circuit and forms one stage of a radio frequency amplifier in which a number of similar stages are coupled in cascade. A tuned anode-grid line is formed by coaxial cylinders 2, 3, the cylinder 2 being insulated from a metal disc 4, which is in contact with the anode disc 5 of the valve 1, by a mica ring 6 forming a small capacitance between the disc 4 and a flange on the cylinder 2. The cylinder 3 has spring fingers which bear against the grid disc 7 of the valve 1. A further cylinder 8, which has spring fingers bearing against the cathode connector 9, forms a tuned grid-cathode line with the cylinder 3. A metal flange 10 on the cylinder 8 is insulated from an end flange on the cylinder 3 by a mica ring 11 forming a small capacitance. A lead 12 is connected to the heater pin of the valve 1, one side of the heater being connected internally to the cathode. The whole assembly is mounted on a chassis with the cylinders 2, 3 connected thereto so that the assembly is at earth potential for direct currents. One winding 17 of a differential ammeter is connected in the anode circuit, the other winding 20 being connected in the cathode circuit, so that the meter reads the difference between the anode and cathode currents, i.e. the grid current. A switch may be provided to short-circuit either of the windings 17, 20, so that the meter then reads the cathode or anode current. The windings of a differential relay may be connected similarly to the windings 17, 20 to provide an aural or visual warning if the grid current alters beyond predetermined limits.
Patent GB-568470-A (GB)
Title: Improvements in cigarette or cigar ashtrays and rests
IPC: A24F19/00
Filed: 1943-08-31
Abstract: 568,470. Cigar or cigarette rests and extinguishers ; ash-trays. SLEEMAN, W. G. R. Aug. 31, 1943, No. 14164. [Class 130] A disc-like tray or platform A is formed with a substantial rim B, preferably overhanging, and with a central passage D for embracing a cigarette or cigar and affording a substantial depth of supporting surface for the cigarette or cigar. The device serves as an ash-tray and as a rest for supporting a cigarette &c. on a .table, as shown in Fig. 5, while the passage D is long enough to extinguish the cigarette when it burns down. The tray may be dished or saucer-shaped and may be polygonal or provided with projections C to prevent rolling.
Patent GB-929250-A (GB)
Title: Improvements in or relating to letter boxes
IPC: A47G29/126
Filed: 1961-04-20
Abstract: 929,250. Letter boxes. HYRESGASTERNAS SPARKASSE-OCH BYGGNADS FORENINGARS RIKSFORBUND U.p.A. April 20, 1961 [April 22, 1960], No. 14250/61. Class 18. A letter box comprises an open ended box 1, 2 which extends through a door, an outer flap 6 secured to a channelled member 7 having sides 8 pivotally mounted at 9 so that when the letter box is closed the base of the member 7 extends diagonally across the box 1, 2, and an inner flap 10 hingedly mounted on the inside of the door and connected by arms 11 to the member. 7, the arrangement being such that when the outer flap is swung open the base of the member 7 moves downwardly from the position shown and the inner flap 10 is raised. The box 1, 2 has a peripheral outer flange 4 which may be covered as shown at 5 with a material such as rubber. The underside of the base of the member 7 may be covered with felt and the inner flap 10 may be mounted on a frame which is secured to the inner end of the box 1, 2. The outer flap may carry a name plate 12 and the inner flap may be coated with a sound insultating material. In a modification the member 7 is pivoted at the lower corners of the box 1, 2 and the inner flap is opened by arms moved by projections on the sides 8 of the member 7.
Patent GB-928244-A (GB)
Title: Fibrous inorganic material
IPC: C04B35/622
Filed: 1961-04-20
Abstract: Fibrous mullite of intermediate dimension less than 5 microns, preferably less than 1 micron, having an axial ratio 100:1, preferably 1000:1, where the axial ratio is defined as the ratio of the longest to intermediate dimensions, is produced by heating to 800 DEG -1200 DEG C., preferably 900 DEG -1100 DEG C. in an inert atmosphere containing at least 1% by volume of hydrogen, a mixture of finely divided silica, aluminium and aluminium sulphide.  The mixture of silica and/or aluminium sulphide may be produced in situ under fibre forming conditions and may also include a minor amount of fluoride.  The preferred proportions by weight are 2:1:1.  The non-fibrous matter may be separated from the fibrous product by hydroclassification using for preference water as the medium, although alcohols and hydrocarbons may be used.  Recovery of fibres may be effected by filtration.  The examples refer.  The fibrous product may be mixed with silica, carbon, asbestos, titanium dioxide, potassium titanate, glass fibres, cotton, nylon and formed into mats (see Group VIII) spun into yarns (see Group IX), may be used as a paper filler (see Group VIII), ceramic composition (see Group V) or thermal and electrical insulation with or without the aid of organic or inorganic binders.ALSO:Fibrous mullite, produced by a process (see Group III) of vapour phase crystallisation, having an intermediate dimension of less than 5 microns, preferably less than 1 micron and the ratio of the longest to intermediate dimension of at least 100 : 1, preferably 1000 : 1, may be admixed with silica, carbon asbestos titanium dioxide, potassium titanate, alumina or glass and optionally organic or inorganic binders for use as a reinforcing agent for ceramic compositions.  Other applications (see Groups VIII and IX).
Patent GB-864939-A (GB)
Title: Improvements relating to the construction of thermionic valves
Inventor: FARROW FREDERIC WILLIAM RODBAR
IPC: H01J19/74
Filed: 1958-05-05
Abstract: 864,939. Thermionic valves. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. May 4, 1959 [May 5, 1958], No, 14302/58. Class 39(1). In a method of constructing a thermionic valve, the support rods 5 of a grid electrode 3 are secured to posts 6, attached to insulating support discs 2, by means of ductile connecting members 7 welded to the posts and the support rods. The grid electrode 3 is then aligned with an adjacent grid electrode by bending the connecting members 7.
Patent GB-466152-A (GB)
Title: Improvements in or relating to motion picture apparatus
IPC: G03B9/10
Filed: 1935-11-19
Abstract: 466,152. Kinematograph cameras. KODAK, Ltd. (Eastman Kodak Co.) Nov. 19, 1935, No. 14327 /36. Divided out of 466,116 under which a Specification was laid open to inspection under Sect. 91 of the Acts, May 21, 1936. [Class 97 (i)] In a camera and film magazine for insertion therein, the magazine having a shutter for an aperture through which the film, while totally enclosed in the magazine, is exposed, means is provided for opening the shutter after the camera cover has been closed on the inserted magazine, and the shutter is other than a three-position shutter as claimed in Specification 466,116. The shutter-opening means may be automatically operated by locking means for the camera cover.
Patent GB-1312951-A (GB)
Title: Method of coating solid surfaces
IPC: C08L63/00
Filed: 1970-03-24
Abstract: 1312951 Coated glass or ceramic surfaces GLASS CONTAINERS CORP 24 March 1970 [24 March 1969 (2)] 14352/70 Heading B2E [Also in Division C3]  Glass or ceramic surfaces are coated by spraying on to the surface a liquid curable coating agent, comprising a monomer or oligomer curable by heat to a hard polymer and free of voltaile solvent or diluent (defined as liquids unreactive with ingredients of the coating material), the surface being at a temperature sufficient to cure, at least partially, the coating agent and form a hard polymeric coating. The method may be applied to glass containers, flat glass, optical glass, windshields, window panes, glass fibres, earthenware, chinaware and insulators. Usually a catalyst is present in the coating material or is previously applied to the surface. The glass articles may be coated as they pass through the lehr during production. The coating agent may comprise an ester of phthalic acid or pyromellitic acid and an unsaturated alcohol, e.g. allyl or vinyl alcohol or a cycloaliphatic epoxide of general formula X 1 -A-X 2  where X 1  and X 2  are epoxidebearing cycloaliphatic rings and A a linking entity. Numerous suitable compounds are listed. The coating agent may also be an diallyl orthaphthalate system, in which diallyl orthophthalate monomer is applied to the hot surface without catalyst. Other such vinyl-type materials are also listed and bisphenol A diglycidyl ether and polyurethane systems are mentioned.
Patent GB-611899-A (GB)
Title: Improvements in or relating to bicycle, tricycle, motor cycle and like machine saddles
IPC: B62J1/00
Filed: 1946-05-13
Abstract: 611,899. Bicycle saddles. SCOULAR, L. G. May 13, 1946, No. 14426. [Class 136 (iii)] In a saddle of the kind which comprises two supports arranged side by side, each adapted to fit below the ischial tuberosity, and a pivotal mounting under the supports which allows them to tilt independently under spring control about an axis extending transversely from side to side of the saddle, each support 1 is curved concavely and its underside is recessed to receive a tubular bearing 3 on which the support is mounted for tilting movement so as to bring the tilting axis close to the top surface of the support. Each bearing 3 is slidably mounted on a tube 4 and is secured in any position by a pair of collars 5 and set-screws 6. Helical tension springs 7, Fig. 4, connect the screws 6 to brackets 8 on the supports. The tube 4 is secured in a horizontal bore in a T- shaped bracket 9 by a bolt 11, and the bracket is clamped to the saddle pillar 10 by a bolt 12. The saddle pillar may be spring supported and slidably mounted in the rear upright tube. It may be provided with a keyway or be made non-circular to prevent rotation. The supports 1 are faced with sponge rubber 2 or other resilient material. In a modification, the collars 5 are replaced by spring clips.
Patent GB-1502425-A (GB)
Title: Stroke control apparatus for a variable stroke hydraulic pump
IPC: F04B1/32
Filed: 1975-05-07
Abstract: 1502425 Fluid pressure servomotor systems LUCAS INDUSTRIES Ltd 7 May 1975 [2 April 1974] 14462/74 Heading G3P A variable stroke hydraulic main pump P includes means to automatically return the pump to substantially zero stroke in the event of pressure failure of boost pump B. The main pump P is of reversible swash-plate type driven by motor E and connected via lines 62, 63 with hydraulic motor M. The angle of the swash-plate 104, Fig. 1 (not shown) is controlled by a rod 12 via a moving- seat piston and cylinder servomotor arrangement (105, 106). Rod 12 can be moved in either direction by an external manual lever (44), Fig. 3 (not shown) which acts through a spring loaded linkage (45) on a pin (46) engaging in groove 15, between flanges 13, 14 attached to the rod. Disposed opposite the latter is a device 50 having a plunger 55 which is normally urged leftwards to the position shown by the boost pump output pressure communicated via line 61 to act on a stepped portion of the plunger against the bias of a spring (57), Fig. 4 (not shown). Should the boost pump pressure fail, the spring (57) urges plunger 55 rightwards causing interacting pivoted levers 31, 37 to move towards each other so that abutments 34, 40 thereon engage flanges 13, 14 to override all other controls and move the swashplate to the zero stroke position. The control mechanism also includes a device 16 having a slidable sleeve 17 with a shoulder 18 subject in chamber 25 to the higher of the main pump pressures in lines 62, 63 communicated thereto via selector valve V and lines 65, 66. During normal operation an increase in pressure causes sleeve 17 and rod 19 to move leftwards against the bias of spring 24, thus pivoting levers 31, 37 to reduce the pump stroke and thus the pressure. Should the pressure rise excessively, then valve 26 unseats to communicate pressure from chamber 25 to a piston and cylinder actuator 28 causing the latter to displace rod 19 leftwards relative to sleeve 17 so as to move the swash-plate to the zero stroke position. The periphery of bush 23 of device 16 is part-spherical to enable the bush to tilt slightly under load from rod 19 to thus reduce stiction.