baber/WOPTO huggingface dataset:
Patent GB-1393036-A (GB)
Title: Foldable building structure
IPC: E04B1/344
Filed: 1972-06-15
Abstract: 1393036 Prefabricated folding buildings E M ALLISON 15 June 1972 [18 June 1971] 28050/72 Addition to 1273469 Heading E1A In a modification of the prefabricated folding double storey building described with refer ence to Fig 17 of Specification 1273469 and claimed in claims 1 and 24 thereof the lower 72' and upper side wall panels on opposite sides of the building are connected by hinge means to an outwardly disposed longitudinal edge of the upper floor wing section 64 on the associated side of the building structure, so that, during erection the upper floor wing sections may be swung upwardly to their horizontal positions and their associated lower side wall sections then swung downwardly into vertically disposed supporting relation therewith.
Patent GB-1439128-A (GB)
Title: Weapons
IPC: F41C27/06
Filed: 1972-06-15
Abstract: 1439128 Electrically-fired weapons; grenades DEFENCE SECRETARY OF STATE FOR 8 June 1972 28063/72 Headings F3C and F3A A weapon has an electrical firing circuit which includes first and second spaced-apart independently hand-operated switches 44, 45, Fig. 1, firing only being effected when both micro switches 44, 45 are in the closed position simultaneously, the spacing-apart of the switches 44, 45 preventing simultaneous engagement by the same hand of an operator and the switch 44 being closable momentarily. Micro switch 44 is operated to the closed position by a trigger 29 and a tripping mechanism, which latter comprises a slidable rod 22 carried by a guard 20, and a spring 24 which urges a notch 26 of the rod 22 against a trigger detent 31. When the trigger is pulled the detent 31 releases the rod 22 which is moved by the spring 24 to the position shown in Fig. 3, whereupon a roller 77 attached to one end of a spring arm 75, moves in to a recess 28, Fig. 3, so causing the arm 75 to operate a button 80 of micro switch 44. At the same time if the switch 45, Fig. 1, is closed by a push-button 39 a plunger 41 depresses a button 81 and both switches 44, 45, thus are closed, so completing a circuit via a spigot 62 carried by and insulated from, a plug 64 whic is supported in the barrel 1 by a backplate 43 and firing a grenade positioned in the barrel 1 of the weapon and having an adapter provided with spring clips 68, 69, Fig. 4, which are electrically connected to each other through an explosive conducting composition of the grenade.
Patent GB-1073972-A (GB)
Title: Manufacture of bonded and inflated sheet laminations
IPC: B21D53/04
Filed: 1964-07-08
Abstract: 1,073,972. Making heat exchangers; stamping; rolling. REYNOLDS METALS CO. July 8, 1964 [July 9, 1963], No. 28209/64. Headings B3A, B3M and B3Q. A method of making a heat-exchanger panel 32 having a tubular passageway between two sheets of material of which at least one sheet is of a work-hardenable aluminium alloy, comprises bonding the sheets together, and introducing an inflating fluid under pressure between the sheets to form the passageway in the aluminium alloy sheet, this sheet upon inflation to separate the bond producing a sharp wedg formation (120, Fig. 9), moving ahead of th inflating fluid so as to avoid the formation of restrictions in the passageway. After rollbonding, the sheets are partially annealed to render them readily formable without being too soft, so that the desired sharp inflation wedge results. Two or more sheets 32 of aluminium alloy having the following constituents may be used: Si 0À3% Fe up to 0À7% Cu up to 0À25% Mn 1À0-1À5% Mg 0À8-1À3% Zn up to 0À25% Impurities up to 0À15% Balance Al. Adjacent sheets may be of different metals or alloys. The sheets 32 are dry-annealed in a furnace 30 and wire-brushed at 34 before they are placed together with unclad surfaces in contact and secured by spot-welding 38. Stopweld 40 is painted on one of the sheets where the inflation needle is to be introduced. The sheets are heated in a furnace 42 to the desired temperature for roll-bonding between rolls 46. Further hot and cold-rolling operations follow, between rolls 50, 52. Partial annealing to approximately quarter hardness is then effected. The stop-weld area is then expanded by a wedge 54 to receive the inflation needle 66, with the sheets sandwiched between dies 58, 60, one or both of which have tube-forming grooves. Holes (Fig. 2) in the panel may locate on pins in the lower die 58. Oil, water or gas may be used for inflation; any residue of distilled water may be removed by evaporation. The die-passages have air vents and various cross-sections (Figs. 7, 8, 21). In an example, two sheets of the aluminium alloy are heated to 900-1000 F. and hot-rolled at about 920 F., with a reduction of 75%. A second hot-rolling at 600 F. follows, with a reduction of 14À3%. The panel is then flattened by coldrolling, annealed to quarter hardness by heating to 600 F. for approximately thirty minutes, and cut to size. An inflation pressing of 15,000 p.s.i. is applied and the panel removed from the dies and sheared to final size, for use with a working pressure of 600 p.s.i. In another example, a reduction of 72% is effected in the first hot-rolling and 14À3% in the second. In a further example, a first hot-rolling reduction of 64% is followed by a second of 30% and then by a cold-rolling reduction of 10%. A bond of minimum strength could be achieved by a first hot-rolling with a reduction of 50-60%.
Patent GB-1313012-A (GB)
Title: Current limiting devices
IPC: H01H87/00
Filed: 1970-06-10
Abstract: 1313012 Fusible cut-outs MITSUBISHI DENKI KK 10 June 1970 [10 June 1969 1 Nov 1969] 28222/70 Heading H1N In a current limiting device, of the kind described in Specification 1,214,711, in which a quantity of vaporizable solid or liquid conducting material occupies a bore 26 in an insulator 14 betweem two metal electrodes 10, 12, at least that portion of the insulator surrounding the bore has a thermal conductivity at least as great as that of the vaporizable material. The material may be sodium, potassium or an alloy thereof or gallium and the insulator of beryllia. Or the insulator may be hot pressure moulded from a mixture of mica, glass, metallic oxide, and powdered copper. The evaporated material expands against a piston 24 and gas cushion 30. The terminal 12 and a cap 16 form a metal casing. Alternatively (Fig. 4, not shown) the two terminals are moulded into the insulator. A portion of the bore 26 may be surrounded by a sleeve of high resistance metal (Fig. 5, not shown). Reference has been directed by the Comptroller to Specification 1,214,711.
Patent GB-1424267-A (GB)
Title: Radio frequency power divider
IPC: H01P5/04
Filed: 1973-06-14
Abstract: 1424267 Variable power dividers NATIONAL AERONAUTICS & SPACE ADMINISTRATION 14 June 1973 [15 June 1972] 28275/73 Heading H1W [Also in Division H4] A radio frequency power divider comprises an input port, two output ports, control means for varying the relative power available at the two output ports to effect a smooth and linear transition from full power at one output port to full power at the other output port, means for dividing energy applied to the input port into two channels, a pair of electrically controlled, variable phase shift means respectively disposed in the two channels for differentially varying the phase of the energies in the two channels, means for supplying differentially related control signals to the pair of phase shift means, whereby one control signal increases as the other decreases, and means for combining the phase shifted energies in the two channels and applying the output energy to the two output ports, the combining means being responsive to the relative phase of the energies in the two channels to proportion the output energy between said two output ports in dependence thereupon. In a first embodiment, a device 1, Fig. 1, splits the input into substantially equal parts, any imbalance being absorbed in a resistor 2. Equal powers are applied to phase shifters 3, 4, which may be voltage variable capacitor diodes. Bias voltages are applied from a source of differential control signals, and the phase shifters are designed to produce 45 degree phase shifts when said source supplies equal voltages. The voltages are varied from this value so that complementary phase changes are produced in the phase shifters. Thus, when either produces an overall phase shift of 90 degrees, the other produces zero phase shift (Figs. 2, 3, 4, not shown). The outputs from the phase shifters are applied to a 3dB hybrid coupler 5. With equal diode biases, equal powers appear at the output ports of the hybrid and, as the biases are varied, the power split is changed, until substantially all the power appears at one or other of the ports. In a second embodiment (Fig. 5, not shown) voltage variable capacitor diodes are shuntconnected by means of power dividers, to provide higher power operation. Stripline fabrication is employed, a device 17, Figs. 6, 6a, performing the functions of an equal-power divider 1, a resistor 2, and an output hybrid 5 (as in Fig. 1), and comprising coupling hybrids 6, 7. Two devices 18, one only of which is shown, are coupled to the device 17 by coaxial cables 33, 34. Each contains two equal-power dividers 8, which are terminated in voltage variable capacitor diodes 9, 10 with respective tuning stubs 11, 12. Bias is applied from a terminal 36 via a quarter-wave line 14, having by-pass capacitors 13, 15 at its ends.
Patent GB-420622-A (GB)
Title: Improvements in or relating to automatic or semi-automatic telephone systems
IPC: H04Q3/00
Filed: 1933-10-13
Abstract: 420,622. Automatic exchange systems. ERICSSON TELEPHONES, Ltd., 67, Kingsway, London, and CROWE, D. C., Ericsson Telephone Works, Beeston, Nottingham. Oct. 13, 1933, No. 28310. [Class 40 (iv)] In a call-finder system, the combined line and cut-off relay L is of single-step type and upon operation locks in series with the common start relay SG and disconnects itself from the calling loop. Release relay B energizes in each idle finder and closes the usual hunting circuits, and test and switching relay S energizes in series with L or with a shunt resistance when the calling line is reached. Line relay A energizes and maintains release relay B. Start relay SG falls back owing to the shunting effect of earth on the test wire, but it is not prevented from re-operating in series with other line relays. Upon release, battery connected to the test wire through a resistance 4 during the slow release period of S shunts the left-hand winding of L and increases the current in the right-hand opposing winding sufficiently to unlock the relay. Should the calling party hang up before his line is found, the search continues, but no holding circuit is made for B, so that L becomes unlocked as already described. When the subscriber's line is seized by a final selector, relay L energizes in the usual manner to earth on the test wire, which prevents the operation of SG, and is unlocked by the application of battery through a resistance 6 during the release period of BC. If desired, relays S, BC may be held until L has fallen back by replacing resistances 4, 6 by additional windings of these relays. The condition of relay L is unaffected by booster metering battery on the test wire, but a rectifier may be inserted in the circuit of SG to prevent its operation thereby. If the substation is of local battery type, relay L may be operated by a loop circuit or by A.C. from a magneto generator, and in the latter case the battery connection of L may be changed to earth, the polarity of all other connections to the test wire also being reversed. Relay L may have a third winding connected between contact l4 and the test wire in order to increase its sensitivity without slowing up the operation of S.
Patent GB-393827-A (GB)
Title: Improvements in or relating to the tilling tools of rotary tilling machines
IPC: A01B33/10
Filed: 1932-10-11
Abstract: 393,827. Machines for working land. FOWLER & CO. (LEEDS), Ltd., J., Steam Plough & Locomotive Works, HASSON, P. R. and STOREY, N. C., 13, Leathley Road, Hunslet, both in Leeds. Oct. 11, 1932, No. 28333. [Class 6 (i).] In a self-propelled or power-drawn rotary tilling machine in which the tools are mounted around inclined driven rings placed side by side or concentrically so that each tool describes a cycloidal path, the tools have two lateral cutting or scraping edges A<1>, A<2> and a transverse bottom cutting edge A<3> and are wide enough to provide clearance for their carriers B, their faces being approximately radial to the axis of revolution of the ring C carrying the tools or tangent to small circles concentric with that axis, so that the lines of intersection with planes perpendicular to the axis preferably make slightly obtuse angles with the tangents to the circles of sweep. Each tool may be upswept or bent so that its face angle to a plane perpendicular to the axis of rotation varies from a small angle at its lower edge to a larger angle at its upper end. The tool may be bent or twisted according to the class of cultivation to be performed. It may be in two parts, one of which is replaceable. The carriers B are narrower than the tools A and extend down behind them nearly to the bottom. The upperends form plates and rearwardly extending strut members which are bolted to the ring C. Specification 103,302, [Class 6 (i), Cultivating implements &c.], is referred to.
Patent GB-855342-A (GB)
Title: Improvements in transistor amplifiers
Inventor: SNEATH OSWALD BARBER
IPC: H03G3/30
Filed: 1955-10-05
Abstract: 855,342. Transistor amplifier circuits. MULTITONE ELECTRIC CO. Ltd. Jan. 4, 1957 [Oct. 5, 1955], No. 28377/55. Class 40(6). A junction transistor amplifier has a load in the emitter circuit and comprises a bias circuit consisting of a rectifier having one side connected through a capacitor to the emitter and the other side connected to the supply so that an increase mean current flows through the transistor as the signal amplitude increases. In Fig. 1 bias is applied to the base of the transistor from a capacitor and rectifier circuit C, M connected across the load terminals L1, L2, a small standing bias being obtained from a potentiometer R1, R2 to prevent distortion at low signal levels. One of the resistors may be temperature sensitive so as to stabilize the transistor operation. In an alternative circuit (Fig. 2 not shown) the resistor R2 is connected in series with the rectifier, while in Fig. 3 (not shown) a resistor is connected in parallel with the rectifier so that the zero signal current is still small even at high temperatures. The invention may also be applied to push pull amplifiers.