baber/WOPTO huggingface dataset:
Patent GB-1531365-A (GB)
Title: Inverter circuit for induction heating cooking apparatus with a protection device
IPC: H05B6/06
Filed: 1976-03-01
Abstract: 1531365 Protecting inverters: control systems for induction cookers MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 1 March 1976 [7 March 1975] 8117/76 Headings H2F and H2H [Also in Divisions H1 and H5] In a thyristor inverter for an induction cooker, excessive voltage across the thyristor 6 following a delayed turn-off is detected and provides a D.C. signal to the gate of thyristor 6 so as to open a circuit breaker on the A.C. side; means is also provided for detecting an excessive thyristor ON period and so inhibit the gate pulses. As shown in Fig. 12, the A.C. mains 1 is rectified at 3 and passed via a limiting inductor 4 to a thyristor inverter 6, 7, 8, 9 feeding at least one induction heating coil. The power in at least one of the heating coils may be changed by a switch 21 which changes the value of capacitor 10a or 10b, switch 21 being ganged by an actuating member 25 (Fig. 11, see Division H1) arranged so that switch 24 always opens before switch 21 changes over and so switches the control circuit 23A so as to provide start and stop of the inverter at zero crossings of the supply 1. Control and protection circuits.-Fig. 13 shows a gate pulse oscillator 12 feeding pulses via an amplifier 13 to the thyristor 6 of the inverter. The anode/cathode voltage of thyristor 6 is monitored at 14 and turns on a thyristor 109 if the voltage becomes excessive following a commutation failure. Thyristor 109 feeds a continuous D.C. trigger to the thyristor 6 so as to open a circuit breaker (not shown). The conduction period of the thyristor 6 is compared at 18 with a wave derived from a monostable multivibrator 117 and a thyristor 108 turned on in the event of commutation failure so as to stop gate pulse oscillator 12. A zero-voltage switch 38 is synchronized by a mains-supplied rectifier 125-128 and includes a D-type flip-flop 123 which arranges resetting of the gate oscillator 12 following a zero-crossing. The temperature of the pan and of the heating coils is monitored by PTC thermistors 33, 33<SP>1</SP> and if excessive, turns on transistor 122 which stops the operation of the gate pulse oscillator 12 at the next zero crossing. The current in the heating coils is monitored by transformers 35, 35<SP>1</SP>, the output of which is voltage-doubled at 40, amplified at 41 and if excessive, turns on transistor 122.
Patent GB-1292387-A (GB)
Title: Improvements in or relating to thermoelectric generators
Inventor: HAMPL EDWARD FRANK
IPC: H01L35/16
Filed: 1970-02-19
Abstract: 1292387 Thermoelectric devices MINNESOTA MINING & MFG CO 19 Feb 1970 8118/70 Heading H1K [Also in Division C7] A thermoelectric generator comprises at least one thermocouple with N-type and P-type thermoelectric legs, the latter consisting of:- Cu 27-67a/o Te 32À5-33À7a/o and Ag 0-40 a/o or Cu 60-67a/o Se 32À5-33À7a/o and Ag 0-7a/o with optional additions to both compositions of up to 1 w/o in total of Na, K, Li, Sn, Cr and Mn. The P-type leg may be made by casting or possibly by powder metallurgy, it may comprise at least two segements of differing composition for use in different thermal gradients; and it may be pressure engaged at the hot end with a contact member of oxide-free Mo, Mo-Fe alloy Ni, graphite or Pt.
Patent GB-1033372-A (GB)
Title: d.c monitoring circuit
Inventor: HUTCHEON IAN CARRODUS
IPC: H03F1/54
Filed: 1962-03-02
Abstract: 1,033,372. Diode switching circuits. GEORGE KENT Ltd. March 4, 1963 [March 2, 1962], No. 8187/62. Headings H3P and H3T. [Also in Division G1] A circuit for selecting the current source having the highest current from a plurality of direct current sources comprises a diode in shunt with each source, all diodes being connected in series with each other and with an output circuit. The circuit is described for use in a temperature control system in which direct currents from sources II ... In are respectively indicative of the temperature at different points in a furnace. The highest current from any source reversebiases the associated silicon diode and forwardbiases the rest of the diodes so that the load current is approximately equal to that from the highest current source.
Patent GB-1255735-A (GB)
Title: Improvements relating to damping devices
Inventor: GLAZE STANLEY GEORGE
IPC: B64C13/00
Filed: 1969-02-14
Abstract: 1,255,735. Hydraulic actuators. H. M. HOBSON Ltd. May 13, 1970 [Feb.14, 1969], No.8233/69. Heading F1P. [Also in Division G3] The flying control surface of an aircraft is operated by a hydraulic jack 11 incorporating a damping orifice 20 to prevent instability when the control valve 12 is nearly closed. Oppositely handed non-return valves 23 in parallel with the orifice 20 lift at high-pressure to permit operation of the jack at maximum velocity while a further pair of valves 22 prevent cavitation. Instead of providing the orifice in a fixed smaller piston 17, as shown, it may be provided in the piston 10 of the jack which is also provided with one of the by-pass valves. S1 and S2 represent the compliances in the aircraft structure.
Patent GB-1223604-A (GB)
Title: Improvements in or relating to portable hoists
Inventor: TAMPIN HERBERT CLEMENT
IPC: B66C5/02
Filed: 1968-02-20
Abstract: 1,223,604. Winding apparatus. H. C. TAMPIN. 14 Feb., 1969 [20 Feb., 1968], No. 8241/68. Heading B8B. [Also in Division E1] A portable hoisting arrangement for a worker's cradle 8 suspended on cables 9, 10, comprises a pair of cable drums 11, 12, rotatablymounted on a frame 4 and interconnected for equal rotation in opposite direction by gearwheels 18, 19, and electric drive motors 22, 23, and a brake mechanism associated with each drum, each brake mechanism being maintained in its released condition by a solenoid, but being forced into its applied condition by spring washers when the solenoid becomes deenergized. The drums are driven by one or both of the reversible motors 22, 23 through gears on the motor shafts in engagement with the drum gears 18, 19. The motors are normally controlled from an electrical controller 44 in the cradle 8 but the drums may be manually turned by a crank handle on one motor shaft, a disc brake which is normally electrically controlled on that motor, being manually controllable by a lever 43. Brake drums mounted below the gears 18, 19 on the cable drums are each engageable by calliper brake shoes jointly operable through levers 30, 31, 33, 34, a further lever being provided for manual release of the applied brakes. Jibs 1, 2 are releasably pinned to the frame 4 and extend out over the edge 3 of the roof of a building, the ends of the jibs mounting sheaves 6, 7 over which the cables 1, 2 pass between the drums and cradle. A hand-actuated reeling drum 46 is mounted on the cradle to take up slack in an electric cable 65 coupling the controller 44 to a portable control box 45 on the roof which controls the motors and brakes via a cable 67.
Patent GB-1002352-A (GB)
Title: A spool carrier for a braiding machine
IPC: D04C3/14
Filed: 1962-03-02
Abstract: 1,002,352. Braiding carriers. J. F. KARG. March 2, 1962 [March 16, 1961], No. 828562. Heading D1C. A bobbin carrier for .a braiding machine has a pawl and ratchet arrangement for releasing the bobbin or preventing its rotation depending on the tension exerted on the thread. The carrier comprises a base 11 supporting a spindle 20 carrying a bobbin 15 the base of which has attached to it a ratchet wheel 23. A pawl 30 is adapted to engage, with its projection 32, with the wheel 23 to prevent rotation of the bobbin. A guide tube 34 is also mounted on the base 11 and has secured at one end a guide roller 39 and guide eye 17 whilst also slidably supporting a guide roller 46. Thread from the bobbin is guided around a stationary roller 36 and thence round roller 39 and roller 46 to be eventually delivered through aperture 17. The roller 46 is secured to a block 50 slidable on a shaft 51 within the tube 34 against the action of a spring 60. The shaft 51 has a stop nut which when engaged by the block 50, as the result of yarn tension moving roller 46 causes the shaft 51 to move axially so that a block 54 secured to its end is caused to move along the tube 34. A cam member 59 connected to the block 54 is thereby likewise moved when stop 52 is engaged by block 50 and moved against the action of spring 58 and in doing so acts on an arm 33 of the pawl 30 to cause it to disengage the position from the ratchet 23, thereby permitting the thread to be withdrawn from the bobbin as the bobbin rotates. The tension imposed by the spring 60 can be varied by adjusting an end plug 61 on the tube 34 against which the spring abuts. The ultimate tension in the yarn can be determined by varying the position of the stop nut 52 on the shaft 51.
Patent GB-566826-A (GB)
Title: Improvements in or relating to lamp standards and the like
IPC: F21S8/00
Filed: 1943-05-25
Abstract: 566,826. Street lamps. FINER, H. J. May 25, 1943, No. 8321. [Class 75 (iv)] Thoroughfares are illuminated by tubular fluorescent or other lamps, the reflector casings of which extend radially as arms from spaced standards at the sides of the thoroughfare so as to light the entire road surface.
Patent GB-1539599-A (GB)
Title: Solid electrolytic capacitors
IPC: H01G9/00
Filed: 1976-03-02
Abstract: In order to simplify and to automate the fitting of electrical connections (11, 13) to an electrical component, for example a solid-electrolyte capacitor (14), two metal strips (10, 12) having stamped connections are used. These connections (11, 13) may consist of different materials and may have different shapes, dimensions and/or different surface coatings. The connections can be fitted to the component in separate method steps. The invention is characterised, in particular, by the advantage of a method which can be carried out economically and by machine without any additional superfluous bending processes. <IMAGE>
Patent GB-787615-A (GB)
Title: Process for the allylation of benzene and homologous hydrocarbons
IPC: C07C2/86
Filed: 1956-03-16
Abstract: Allyl derivatives of benzene and its homologues are prepared by heating the hydrocarbon with allyl orthoborate in the presence of a Friedel-Crafts catalyst, particularly ferric chloride, aluminium chloride and boron trifluoride.  Preferably 1/25 to 1/50 mol. of catalyst per mol. of hydrocarbon is mixed with the hydrocarbon and the allyl borate is added in small portions over a period of time to a total of about 1/10 mol. per mol. of hydrocarbon, then the mixture is maintained at 50-100 DEG  C. for one to two hours, the hydrocarbon layer is separated, washed with water, dried and distilled.  The process can be applied to benzene, toluene, xylene, ethylbenzene, propylbenzene, cumene and cymene.  In the examples, allylbenzene and p-allylcumene are prepared from benzene and cumene respectively.
Patent GB-1205123-A (GB)
Title: Sheet material holding applance
Inventor: CRAIG GRAHAM ALISTAIR
IPC: B05C17/00
Filed: 1968-02-21
Abstract: 1,205,123. Attaching handles to implements. TRIDENT LABORATORIES Ltd. 27 March, 1969 [21 Feb., 1968], No. 8394/68. Heading B4K. [Also in Division A4] An appliance for holding sheet material during use comprises a handle 1 with a resiliently yieldable open gripping part 1a formed with a polygonal internal profile and co-operable with a support member having a correspondingly profiled part detachably insertable in the gripping part 1a and to which the sheet material is securable. In one embodiment (Fig. 1) a resilient support member 2, having a profiled part 2a, traps the sheet material 4 between itself and a channel-section auxiliary support member 3. In a second embodiment (Fig. 4) a support member 6 is provided with a keyed slot 6a to receive a sheet or blade 7, and a lip 6b to prevent undue flexure in one direction of the projecting part of the sheet or blade. The sheet material may be abrasive paper, and an extension 5 may be provided to fit into the tubular handle 1.
Patent GB-577663-A (GB)
Title: Improvements relating to thermionic generators for producing scanning and like voltages
IPC: H03K3/10
Filed: 1944-05-04
Abstract: 577,663. Saw-tooth generators ; square-wave generators. COSSOR, Ltd., A. C., WILLIAMS, B. C. FLEMING-, and ALLEN, A. May 4, 1944, No. 8434. [Class 40 (v)] In a circuit for generating linear potential sweeps and abrupt potential steps in which the anode is connected to a differentiating network feeding the grid, a resistance is inserted between the network and the grid, a voltage drop being maintained across the resistance to bias off the valve. A triggering pulse overcomes the bias, anode current commencing to flow to initiate a sweep of the anode potential. A differentiating network comprising con. denser C1 and resistor R3 is connected between the anode of valve V and the positive power supply, a resistance R2 connecting the grid. In the normal state the grid of valve V is held below cut off potential, the anode is held at the potential of the slider of potentiometer R1 and the lower plate of condenser C1 is held near earth potential due to the diodes D3, D1 and D2 conducting. Upon receipt of a positive triggering pulse over condenser C2, diode D4 conducts to charge condenser C3 cutting off diode D3 so that the grid potential of valve V rises and anode current commences to flow. The anode potential falls slightly and, due to coupling condenser C1, this drop is communicated to the anode of diode D2 which ceases to conduct, the current through resistor R3 then passing to the condenser C1. The grid potential rises slowly and the anode potential falls rapidly until the latter approaches earth potential and is no longer able to maintain the current through condenser C1. The grid potential rises abruptly, causing a large screen current and correspondingly large potential drop over resistor R7. This state continues until condenser C3 charges sufficiently over resistor R5 to cause diode D3 to conduct and cut off valve V, the anode potential then rising exponentially until arrested by diode D1 conducting. The screen potential falls slightly at the commencement of the cycle and remains in this state until the end of the anode sweep and then falls further and stays at this lower potential until condenser C3 charges sufficiently for the diode D3 to cut off valve V. The first step may be removed by feeding the voltage from the screen grid through a suitable limiter. To avoid drawing power from the triggering source the diode D4 may be replaced by a cathode follower Fig. 2 (not shown.
Patent GB-843043-A (GB)
Title: Tobacco distributor for continuous-rod cigarette making machines
IPC: A24C5/39
Filed: 1958-03-17
Abstract: 843,043. Feeding tobacco to continuous-rod cigarette-making machines. USINES DECOUFLE. March 17, 1958 [March 22, 1957], No. 8451/58. Class 130. Cut tobacco is compacted in a passage having smooth lower and side walls, and an upper wall formed by a rough belt 18, the passage comprising straight portions 12 and 13 both slightly increasing in width between their upper and lower walls in the direction of tobacco flow and which are respectively inclined at about 50 degrees and 15 degrees to the horizontal, and a portion of reduced width between a roller 14 and the belt 18, the compacted tobacco being of approximately the same density as a tobacco rod 30 formed therefrom by rollers 24, 27 and a comb 26, and the height of tobacco in the portion 12 being regulated by a pivoted wall section 19 controlling via a switch 22 the driving motor of hopper feed rollers 4, 7 and a belt 2. The roller 4 has lengthened pins 5 at three places round its circumference. The speed of the belt 18 and of the surface of the roller 14 are respectively about four and three times the peripheral speed of the roller 24, and these speeds, and that of a roller 9, may be varied together relative to that of the cigarette-making machine driving shaft.
Patent GB-447386-A (GB)
Title: Improvements in electric transformers of small output
IPC: H01F30/10
Filed: 1934-10-26
Abstract: 447,386. Tranformers. CLARK, H., Natal University College, Durban, South Africa. Oct. 26, 1934, No. 8578/36. Divided out of 442,282. [Class 38 (ii)] In transformers, more particularly current transformers, one of the windings 2 is wound on a core 1 which is wound on another winding 3 so that the flux in the core interlinks a number of times with each turn of the winding 3. The ends of the core 2 may be joined so as to complete the magnetic circuit and the number of times the core is wound around the winding 2 may be arranged so that it is not a factor of the number of turns in the secondary winding. The winding 2 may be of circular, link or bent link form.
Patent GB-1365657-A (GB)
Title: Pipe connection
IPC: E21B17/08
Filed: 1973-02-22
Abstract: 1365657 Pipe couplings: shaft couplings STAHLUND APPARATEBAU HANS LEFFER GmbH 22 Feb 1973 [7 March 1972] 8609/73 Headings F2G and F2U In a pipe coupling, in which castellated pipe rims are intermeshed and then locked together by the engagement of an encircling ring 4 in a groove (3) the sides 4a, 4b, of the ring have a frictional wedging action on the mutually inclined side walls of the groove (3), to eliminate any axial play. When the groove (3) is machined in the pipe rims after assembly of the coupling, means (7) are provided for ensuring that the castellations (la, 2a) can only be reintermeshed in the original position. The ring 4 may be made in two halves, the ends of both being secured by screws 8. A sealing ring 6 is provided.
Patent GB-350074-A (GB)
Title: Improvements in hose couplings
IPC: F16L33/18
Filed: 1930-03-18
Abstract: 350,074. Pipe joints. FRENCH, A. W., Mysto Works, Ladywood, Birmingham. March 18, 1930, No. 8627. [Class 99 (i).] Part of the canvas cover 3 and flexible metal liner 1 of a hose pipe is cut away to expose the rubber portion 8 which is clamped between shoulders on a spigot member 16 and a socket member 4 which is screwed on to the hose. The spigot has an extension 19 which extends to the cut back liner, and is screwed into the socket which is screwed on to the end of the hose. Instead of the corresponding conical shoulders 14, 17, the spigot and socket may have shoulders forming a recess which accommodates a bead formed by turning over the end of the hose. Two couplings are joined by a union nut 28 which is mounted on one socket by expanding the end of the extension 27. A packing ring 31 is provided.
Patent GB-664531-A (GB)
Title: Improvements in or relating to generators of high-frequency oscillations
IPC: H05B6/04
Filed: 1949-03-30
Abstract: 664,531. High-frequency supply systems. WESTINGHOUSE ELECTRIC INTERNATIONAL CO. March 30, 1949 [April 16, 1948], No. 8633/49. Class 38 (iv). [Also in Group XL (c)] Two valve oscillators 3, 3<SP>1</SP>, each having tuned anode circuits 29, 39, 29<SP>1</SP>, 39<SP>1</SP>, feed in push-pull a common load 37. Positive feedback is provided by coils 23, 23<SP>1</SP> which are cross-connected in the grid circuits of valves 3, 31, so as to improve the load sharing. In a modification, Fig. 2 (not shown), the oscillators are connected in parallel.
Patent GB-904335-A (GB)
Title: Improvements in or relating to alarm and test equipment
Inventor: DALY CHARLES TREVOR
IPC: H04Q3/00
Filed: 1959-03-13
Abstract: 904,335. Data-processing equipment. STANDARD TELEPHONES & CABLES Ltd. March 11, 1960 [March 13, 1959], No. 8805/59. Class 106 (1). A recording system records a series of 0's while the associated data-processing equipment is functioning properly. When a fault occurs, however, 1 is recorded after which recording ceases. Playback of the record indicates the whereabouts of the fault. A bi-stable device 10 is set to 0 to energize a write circuit 2 which records a series of 0's on a magnetic drum 1. A fault applies a potential to terminal 8, so reversing the bistable device 10. The write circuit 2 then records 1 after which the write circuit is disabled by the absence of potential on lead 7. When the record is played back at the same time as a clock track a two-beam oscilloscope 5 indicates the time of the fault and its position in a scanning system.
Patent GB-568701-A (GB)
Title: An improved electromagnetic apparatus for measuring and indicating small displacements
IPC: G01D5/20
Filed: 1943-06-03
Abstract: 568,701. Magnetic measurements; inductance measurements ; determining dimensions of materials. BRITISH IRON & STEEL CORPORATION, Ltd., and DOUGLAS, A. June 3, 1943, No. 8916. 37] In apparatus for measuring small displacements an air gap in a magnetic circuit forming the core of a coil is physically varied in accordance with the displacement to be measured, and the coil is connected, in common, both across a 'source of constant frequency A.C. supply in series with a condenser and across an indicating instrument in series with another condenser, the arrangement being such that the instrument responds in accordance with variations in the air gap. The displacement to be measured is connected to a U-shaped iron yoke 1 forming part of the magnetic circuit of a T- shaped. iron member 2 having a coil 3 wound on its centre member. The magnetic circuit includes three equal air gaps 4 which are simultaneously varied by displacement of the yoke 1. One end of the coil 3 is connected to the junction of two equal variable condensers 5, 6, which may be mechanically coupled. The other end of the coil is earthed and connected to two terminals 8, 10. The other sides of the condensers 5, 6 are connected to terminals 7, 9. Across the condensers 5, 6 is connected a variable resistance 11 for balancing the resistance of the coil. A source of constant frequency oscillations is connected between the terminals 7, 8 and a detector is connected between the terminals 9, 10. When the air gap is normal the circuit 7, 5, 3, 8 is tuned to resonate at the frequency of the source and the circuit 9, 6, 3, 10 is similarly tuned, so that no voltage appears across the terminals 9, 10. If the air gap 4 is varied the inductance of the coil 3 is varied and the two circuits are no longer in resonance with the source, a voltage then appearing at the terminals 9, 10 of the indicating instrument. This voltage is a function of the displacement of the piece 1. If the variation of the air gap is kept within the limits of 1 per cent of the initial air gap, the relationship between the change in gap and change in inductance of the coil is substantially linear.
Patent GB-766670-A (GB)
Title: Improvements in or relating to detent mechanisms
Inventor: BOWEN TOM
IPC: G04C23/10
Filed: 1954-03-26
Abstract: 766,670. Time switches. SMITH & SONS (ENGLAND), Ltd., S. Feb. 24, 1955 [March 26, 1954], No. 8970/54. Class 38(5) In a detent mechanism, in which a detent after moving to a position wherein it releases a detained element is moved back into the return path of the element, the latter is yieldable in a direction transverse to its movement when it engages a deflecting member so as to be moved clear of the detent during the return movement of the element. As applied to a switch, the detents 10, 11 are clock-controlled and the detained element comprises a resilient contact-actuating arm 13 pivoted at 12. The arm 13 is retained in the initial and intermediate positions (Figs. 3, 4) by the detents and is released by rotation of the detents, which thereupon return to their set positions. In order to avoid jamming of the arm 13 and the detents during the return movement of the arm, deflecting members 18, 19 are disposed opposite the ends of the detents. During such return movement, the arm 13 rides up the lefthand face (Fig. 2) of the members 18, 19 and is thus prevented from engagement with the detents. The arm 13 is formed with a cam surface 16, 26 which actuates the contacts 29, 30.