baber/WOPTO huggingface dataset:
Patent GB-766304-A (GB)
Title: Improvements in or relating to contact converters
IPC: H02M1/26
Filed: 1955-03-04
Abstract: 766,304. Rectifying. SIEMENS-SCHUCKERTWERKE AKT.-GES. March 4, 1955 [March 6, 1954], No. 6524/55. Class 38 (2). To keep constant the output current of a contact converter, the circuit closing stage length is varied by altering the value of the premagnetizing direct current supplied to the switch chokes, through rectifiers and further saturable chokes, the premagnetization current of which is varied with the output current. A three-phase rectifier comprises main contacts 2 with switch chokes 3 supplied from A.C. lines 10. The contact closing premagnetizing current is supplied to windings 5 from auxiliary supply 13 through phase-shift transformer 34, rectifiers 9 and saturable chokes 14. Smoothing choke 11 gives the current a trapezoidal form and a resistor 12 is permanently adjusted to a suitable value. The actual value of premagnetizing current in 'winding 5 is determined by the difference between the premagnetization of choke 14 produced by the current in winding 16 derived from the main convertor current by current transformer 17 and rectified at 18, or from a direct current transformer on the D.C. side of the converter and a steady reference current from battery 20 through winding 15. This reference current may be set by varying resistor 19 which thus becomes the control for determining the value of the main rectifier load current. So that the difference between the premagnetizing currents in windings 15 and 16 is maintained at the necessary altered value when the load current is restored to its set value, a current is passed through winding 15 proportional to the difference between the input alternating voltage rectified at 24 and the output direct voltage at 30 which is varied to return the load current to its set value. This control is effected by the circuit comprising connector 36, left-hand part of the circuit including winding 15, variable resistor 25, rectifiers 24, and choke 26. So that the phase position of the circuit closing premagnetizing current is shifted as the circuit-closing instant is shifted, phase-shift transformer 34 is connected to phase-shift transformer 35 which supplies motor 33 driving the contacts 2. Switch chokes 3 carry a winding 4 through which is passed a trapezoidal contact opening premagnetizing current from rectifiers 6 energized from auxiliary supply 13, so set by resistor 8 that the opening stage lies just above the zero line.
Patent GB-772153-A (GB)
Title: Improvements in or relating to a speed-responsive electromagnetic switch control
Inventor: JAESCHKE RALPH LOUIS
IPC: F16D48/06
Filed: 1955-03-05
Abstract: 772,153. Magnetic fluid couplings. EATON MANUFACTURING CO. March 5, 1955, No. 6555/55. Class 35. A magnetic fluid coupling for a motor vehicle is energized in dependence on the throttle setting and is fed with a small reverse current to disconnect it. Controlling current passes from a battery 1, through ignition switch 7, switch 45 which closes when a gear is engaged, and switch 47 which closes as soon as the accelerator pedal 46 is moved, to energize relay B. Current then passes through contacts B1. B2 and a resistance controller 43 operated by the accelerator pedal to the clutch coil 39 to take up the drive. The primary winding 3 of the ignition coil 5 is fed through an interrupter 9 in the usual way, and in addition impulses are fed through a rectifier 33 and adjustable resistor 49 to the coil A of a relay 37, this coil being shunted by a condenser 35. As the engine speed rises, the frequency of impulses passing through the coil A becomes sufficient to operate the relay and close the contacts A1, A2. Contacts A2 serve to shunt the switch 47 to prevent de-energization of the coupling when the throttle is closed at speed. Contacts A1 close a by-pass circuit, including a resistor R1 and an additional winding AA on the relay 37, to prevent the release of the throttle pedal weakening the coupling field excessively. The coil AA acts in opposition to the coil A so as to reduce the differential of the relay 37, i.e. increase its sensitivity to changes in engine speed. The adjustable resistor 49 through which the relay is energized, may be controlled manually, or as shown, in dependence on the throttle position. Alternatively the relay coil A may be tapped. Demagnetization of the coupling on opening of contacts B1, B2 is produced by small current fed from the battery through resistors R2, R3, and through the coil 39 in verse direction. Specifications 671,219, 677,534 and 742,545 are referred to.
Patent GB-795040-A (GB)
Title: Improvements in or relating to amplifiers having non-linear characteristics
IPC: H04N5/08
Filed: 1956-03-02
Abstract: 795,040. Non-linear amplifying circuits. FERNSEH GES. March 2, 1956 [March 3, 1955], No. 6602/56. Class 40 (6). In a limiting circuit, Fig. 1, input signals applied to the grid of a discharge tube 7 in a negative sense drive the tube beyond anode current cut-off while positive-going signals cause negative feedback to be operative to reduce the gain of the tube. Assuming the potential of the grid to become more positive in the region So, Fig. 2, current passes through diode 9 and resistor 8 so that when the tube commences to conduct, the cathode is effectively at earth potential and the line S is traced out. When the anode current increases sufficiently to bias off the diode 9, the cathode potential follows that of the grid and heavy negative feedback results so that the output rises very slowly with increasing input, S2. When an input signal of a television waveform Vi, Fig. 3, is applied over D.C. restoring circuit 2, 3 to the grid of tube 7, only positive-going pulses Vo appear at the anode and are passed over biased diode 12 to the output. Signals from terminal 4 may be fed to the grid of the C.R.T. When the input contains positive-going synchronizing pulses, Fig. 5 (not shown), the circuit 2, 3 is returned to earth with the diode oppositely poled. Provision may be made for switching from one circuit to the other where the different types of signal are to be received.
Patent GB-491536-A (GB)
Title: Improvements in supports for the elastic in ball games with attached ball
IPC: A63B69/00
Filed: 1937-03-05
Abstract: 491,536. Ball games. HEIMERS, R. March 5, 1937, No. 6645. [Classes 132 (ii) and 132 (iii)] A captive ball is attached to a length of elastic passing between supports 8 having a number of separate wheels or rollers 1, 1a with guards 5 partially or wholly surrounding them for keeping the elastic in place, the latter then passing through frictionreducing means 16. When applied to a tennis racket, the supports are attached by rubber bands 10, 21, Fig. 1, and a winding drum 11 is provided on the lower support for storing excess elastic. On the upper support, the friction-reducing means consists of two pairs of rollers 16, 18, Fig. 8, while the guard 5 is provided with a number of prongs 6, Fig. 5, for separating the elastic. Modifications are described for applying the invention to other games apparatus including baseball, football, and pelota, a Spanish game. Golf, hockey, and other Spanish games are mentioned.
Patent GB-1038943-A (GB)
Title: Safety control for hydraulic machine with high pressure closing
IPC: F15B20/00
Filed: 1963-02-19
Abstract: 1,038,943. Casting-machines. G. WINTRISS. Feb. 19, 1963, No. 6657/63. Heading B3F. [Also in Division B5] In a moulding, casting &c. machine having die parts 24, 25 moved together under high pressure by means of a motor 18, and means to stop the motor when the closing pressure exceeds a certain value, this means includes at least two electric contacts 41, 42 connected in series in a control circuit and arranged at spaced-apart locations on one die part and operated by members 38, 39 on the other die part as the die parts reach closed position, and a controller responsive to closing of the contacts prevents operation of the motor-stopping means after closing of the contacts. As shown, the motor 18 is hydraulic and moves the die 25 towards the die 24. If the pressure in cylinder 20 exceeds the predetermined value a sensor 36 (Fig. 2, not shown) completes a circuit through a line 58 to a coil 76 which cuts off the supply to the machine and thereby stops the motor 18. The sensor 36 is rendered inoperative for the first part of the die closing movement, by means of a rod 50 which energizes a relay 53 through a sensing unit 52 (Fig. 4, not shown). After the contacts 41, 42 have been closed the sensor 36 is again rendered ineffective by a coil 66 whose armature 68 breaks the circuit to the coil 76. A contact 41 or 42 is preferably arranged at each corner of the die part 24, the contact 42 being seen in detail in Fig. 3 (not shown). Reference has been directed by the Comptroller to Specification 842,380.
Patent GB-539505-A (GB)
Title: Improvements in radio navigation systems
IPC: G01S19/04
Filed: 1940-04-12
Abstract: 539,505. Directive wireless systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. April 12, 1940, No. 6676. Convention date, April 12, 1939. [Class 40 (v)] A composite apparatus for the guidance of landing aircraft comprises in a single assembly a glide-path indicator, a localizer of the switched-cardioid type for indicating the runway course, and a radio compass which indicates the direction of either the glide-path transmitter or the localizer transmitter. The radio compass uses a horizontal loop aerial 15, Fig. 2, and a dipole aerial 33, which feed a radio receiver 27 through a phasing circuit 19 and a pair of keying valves 39 respectively. The directional sensitivity graph for the compass is therefore a cardioid, but the direction of the axis of the cardioid is continually being reversed by the action of the keying valves 39, which reverse the phase of the dipole output, without altering its strength, under the influence of a source 47 of keying modulation. The latter is applied to the control field of the left-right indicator 31, while the output of the receiver 27 is applied to a moving coil carrying a pointer whose movement depends on the phase relation between the fields. In an embodiment of the invention, Fig. 3, the output of receiver 27 passes through a filter 51, which accepts only the frequency of the keying modulation, and an amplifier 53 with A.V.C. circuit 55 and is applied, together with the output of the source 47 of keying modulation, through a balanced modulator 57 to the compass indicator 31. The glide-path signals are picked up by the loop antenna 15 and are applied through a filter 59 to the glide-path indicator 61. The localizer signals pass from receiver 27 through a detector 63 with A.V.C. circuit 67 to an indicator 65. Instead of an indicator 31, a motor for rotating the dipole as described in Specification 526,537 may be controlled by the radio-compass signals.
Patent GB-818108-A (GB)
Title: Improvements in or relating to self luminous compounds
Inventor: HAND ALBERT
IPC: G21H3/02
Filed: 1957-02-28
Abstract: 818,108. Luminescent materials. BRANDHURST CO. Ltd. Feb. 27, 1958 [Feb. 28, 1957], No. 6711/57. Drawings to Specification. Class 39(1). A luminescent material, such as copperactivated zinc sulphide, contains an artificial radioactive isotope selected from the transuranic elements and emitting mainly alpha radiation with little or no beta or gamma radiation. The radioactive isotopes americium 241, plutonium 239 and curium 242 are preferred but neptunium 237, plutonium 236, 238, 240 and curium 244 may also be used. The hazards normally encountered in the manufacture and use of self-luminous compositions due to the emission of penetrating gamma radiation and toxic gas are greatly reduced and the quality of an americium luminous composition can be assessed immediately after its manufacture. In the preparation of such a composition a salt of americium 241 is dissolved in water and added to a chemically inert substance, such as silica aerogel. The isotope is then precipitated on the surface of the inert substance and after the water has been removed by evaporation it is dispersed in methanol to which is added copperactivated zinc sulphide. Finally the methanol is removed by evaporation with or without filtering to provide a self-luminous composition emitting light in the yellow-green region of the visible spectrum. This composition may be mixed with methyl methacrylate resin and solvent to provide a paint suitable for application to instrument dials and clock or watch dials.
Patent GB-667999-A (GB)
Title: Improvements in or relating to receiving relay devices for remote control by modulated carrier currents
IPC: H02J13/00
Filed: 1950-03-17
Abstract: 667,999. Electric switches. COMPAGNIE POUR LA FABRICATION DES COMPTEURS ET MATERIEL D'USINES A GAZ. March 17, 1950. [March 21, 1949] No. 6730/50. Class 38 (v). [Also in Group XXXVIII] A relay, responsive selectively to the modulation rhythm of a carrier current transmitted, e.g. over a power line, comprises an element which responds to the carrier frequency and sends electric impulses at the modulation rhythm to an auxiliary electromagnetic relay the armature of which is moved between stops and is connected to the outer end of the balance spring of a pendulum relay which responds only to the modulation rhythm to which it is mechanically tuned. As shown, a vibratory reed 2 tuned mechanically to the carrier current frequency is energized by a winding 4 connected with a condenser 6 across the power line 7, 8 to form a series resonant circuit at the carrier frequency. The reed 2 co-operates with a blade 10 having a much lower natural vibrational frequency so that during transmission of a modulated carrier control current the normally closed contact 9 opens only at the modulation rhythm. A normally short-circuited auxiliary relay winding 11 is thereby energized at this rhythm. Its armature 12 is rocked between stops 13, 14, and oscillates the outer end of the balance spring 17 of a pendulum relay 16. The beam relay responds only if it is mechanically tuned to the modulation rhythm when it closes contacts 18, 19, intermittently, the first closure effecting the desired control.
Patent GB-232391-A (GB)
Title: Method to ensure in gas cookers and similar apparatus the positive closing of the gas supply cock
IPC: F16K35/06
Filed: 1924-03-17
Abstract: 232,391. Sabel, G. March 17, 1924. Actuating-mechanism.-To ensure the closing of the supply valve of a gas cooker, one or all of the burner cocks is provided with a handle which can be removed only when the burner cock is turned on, while the supply valve can be turned on only with one of the burner cock handles, which can only be removed from the supply valve when the latter is turned off. The handle has a sleeve b and a movable bolt a of semicircular cross-section. The lower end of the bolt a engages with the gas-supply plug h under the control of the spring c which tends to draw the bolt into the sleeve b. This is prevented by a pin d which is pressed outwards by a spring e. When the handle is applied to the plug, a pivoted leverf is depressed against a spring g, but returns when the handle is rotated. At the end of the rotation the pin d is pushed back into the bolt by the lever f, so that the bolt is not locked in its lower position, and is withdrawn into the sleeve b. The handle is not now capable of actuating the supply valve, but must be withdrawn, inverted, and used for actuating the burner cock, Fig. 2. Each burner cock is fitted with a plug i of semicircular cross-section which fits into the sleeve band so pushes up the bolt a. A bayonet slot h locks the handle l when the cock is turned off, and ensures that the bolt a is pushed up sufficiently to release the pin d to hold the bolt a and render the handle available for use on the gas-supply valve.
Patent GB-1415212-A (GB)
Title: Trioxatricycloundecane derivatives and process for their  manufacture
IPC: C07C405/00
Filed: 1973-02-12
Abstract: 1415212 Trioxatricycloundecane derivatives CIBA-GEIGY AG 12 Feb 1973 [10 Feb 1972 10 May 1972] 6810/73 Heading C2C Novel trioxatricycloundecanes of the formula wherein X 1  is H and X 2  is OH, or X 1  together with X 2  are = 0 are prepared by condensing cis-cyclohexane-1,3,5-triol with compounds of the formula wherein Y is H or OH, or functional derivatives thereof. Alternatively compounds of the above formula in which X 1  is H and X 2  is OH are obtained by reducing the corresponding compound in which X 1  and X 2  together represent = O. The compounds are intermediates in a process for preparing prostaglandins, particularly PGF 2 α and PGF 3 α.
Patent GB-589378-A (GB)
Title: Improvements in automatic work locator
IPC: B23D33/10
Filed: 1945-03-19
Abstract: 589,378. Photo -electric control of metal-working machines. FERGER, H. K., and THOMSON, J. B. March 19, 1945, No. 6835. Convention date, May 26, 1944. [Class 40 (iii)] [Also in Group XXII] A workpiece is positioned on a work-table of a punching, drilling, &c. machine by magnetic or other chucks actuated by light-responsive means. The workpiece 12 is supported on a table 16 and is held stationary by magnetic chucks 20 in circuit a, b, c, d with a lightactuated element 14 energized by light from a source 11 reflected by marks on the workpiece. A switch 22 actuated on descent of the press control a byepass circuit holding the chucks energized when the light beam is interrupted by the tool. The elements 11, 14 are carried on an arm 26 adjustable in a holder 27 by a nut 29.
Patent GB-614426-A (GB)
Title: Insulating head for electric cables under high fluid pressure
IPC: H02G15/26
Filed: 1946-03-05
Abstract: 614,426. Electric cables; junction boxes. COMPAGNIE GENERALE D'ELECTRICITE. March 5, 1946, No. 6892. Convention date, April 3, 1942. [Classes 36 and 38 (i)] An insulating head for cables extending through a partition from a region of high fluid pressure to a low-pressure region consists of a cap 6 capable of resisting high fluid pressure, which is fixed to the low-pressure side of a separating sleeve 1, and provided with a base 11 fitting into a chamber in the sleeve 1 and surrounding the insulation of the cable 2. The chamber communicates through channels 4 with the medium under high pressure. The insulation of the cable 2 is protected by a series of deformable joints 5, and an insulating bushing terminal 7 which firmly encloses the end of the insulation of the cable 2 and fits into the cap 6. If the cable contains a viscous material this end may be sealed by means of a ferrule 13 soldered to the conductor 3 at 14 and provided with flutings 15 which closely engage the cable insulation by virtue of the fluid pressure within the cable. Such a joint may be used for leading submarine cables into junction boxes or other apparatus.
Patent GB-958636-A (GB)
Title: Improvements in or relating to a dispensing syringe
IPC: A61M5/315
Filed: 1963-02-21
Abstract: 958,636. Syringes. KONINKLIJKE NEDERLANDSCHE GIST-EN SPIRITUSFABRIEK N.V. Feb. 21, 1963 [Feb. 26, 1962], No. 6981/63. Heading A5R. A dispensing syringe for the delivery of a substance comprises a barrel 1 with a piston 2 movable therein, a piston-rod 3 arranged to move longitudinally with the piston 2 and provided with indentations or projections located on two lines which extend parallel to the longitudinal axis of rod 3 and are angularly spaced about the axis, the indentations or projections of one line being staggered with respect to those of the other line, and a restraining element 5 secured in the barrel 1 and having a resilience in a plane perpendicular to the axis of the barrel 1, the element 5 being co-operable with each indentation or projection to restrain the rod 3 and piston 2 against movement to deliver a substance from the barrel 1, the rod 3 being releasable from the engagement of an indentation or projection thereof by the restraining element 5 by rotation of the rod 3 about it longitudinal axis, and the rod 3 having a non- circular cross-section such that the element 5 is resiliently stressed by the rod 3 to a greater degree in the angular positions of the rod 3 between the restraining positions, in which the element engages the indentations or projections, than in the restraining positions. The rod 3 may be cruciform in cross-section, the indentations or projections being provided along the ends of at least two adjacent arms of the cross. The restraining element 5 may be a spring wire having two arms engaging opposite sides of the rod 3.
Patent GB-307497-A (GB)
Title: Improvements in rotary pumps or motors
IPC: F04C2/16
Filed: 1929-03-04
Abstract: 307,497. Montelius, C. O. J. March 9, 1928, [Convention date]. Meshing screws.-In a rotary pump or motor of the meshing screw type comprising a power screw and a co-operating screw housed in a tightly fitting casing, the area of the axial projection 8, 3, 6, 7, 8 of the groove of the cooperating screw is made equal to the lens-shaped area 1, 3, 5, 7, 1 over which the circles defining the casing contour overlap. The power screw provides the major portion of the work and alone has a drive shaft. The pitch of the threads is made sufficiently large so that one screw will drive the other without additional gearing. Specification 231,865 is referred to.
Patent GB-828795-A (GB)
Title: Improvements in shock absorbers spring suspensions and buffing and draft gear
Inventor: MOULTON ALEXANDER ERIC
IPC: B61G11/12
Filed: 1956-03-06
Abstract: 828,795. Pneumatic springs; rubber springs. SPENCER, MOULTON & CO. Ltd., G. June 6, 1957 [March 6, 1956], No. 7002/56. Class 108(3) An hydraulic shock absorbing device including a telescoping corrugated rubber bellows 1 having a fabric reinforcing layer 26 has metal rings 28 which resist outward radial movement of the bellows and guide the bellows during telescoping movements. The outer sheath 27 is of rubber or braided wire. The bellows 1 is connected at one end to a buffer head 4 and at the other end to a buffer casing 7. Buffer sleeve 10 slides in a casing 11. During compression hydraulic liquid is forced through a constant leak valve 12 into a recuperating chamber 15, thus compressing the air isolated above a diaphragm 16. A rod 20 and a rubber compression spring 22 co-operate with an auxiliary cylinder 21 to control rebound of the buffer head 4.
Patent GB-577389-A (GB)
Title: Improvements relating to the casting of metals
IPC: B22D17/00
Filed: 1944-04-15
Abstract: 577,389. Valves. BIRMINGHAM ALUMINIUM CASTING (1903) CO., Ltd., PRITCHARD, B. F., and SHERLOCK, W. N. (Representatives of PRITCHARD, P.), and TINSLEY, L. April 15, 1944, No. 7009. [Class 135] [Also in Group XXII] In casting ingots or other articles by forcing metal 11 into a mould 14 from a pot 10 by admitting compressed air or gas thereto from a pipe 17, one or more finely variable leak valves 18, 19 are arranged on the pipe 17 between the pot and the shut-off valve. The shut-off valve 20 may be similar to the valves 18, 19, but arranged to connect the pipe 17 to the supply pipe 30 and thus give a fine control to the amount of gas supplied. These leak valves may be constructed as shown in Fig. 2, with a plug a having a bore e always open to the entrance c, a lateral bore f which may be brought to align with the exhaust opening d, and a circumferential groove g connected to the bore f and having a progressively diminishing crosssection. The plug is held in its seat by a spring and is adjusted by a handle h, the cover j bearing a scale to show the position of the handle. When a leak valve is used at 20, the openings c, d are connected to the pipes 17, 30 respectively. Specification 516,231, [Group XXII], is referred to.