baber/WOPTO huggingface dataset:
Patent GB-1490136-A (GB)
Title: Over-speed prevention apparatus for dc motor
IPC: H02P7/34
Filed: 1975-07-17
Abstract: 1490136 Control of D.C. motors HITACHI Ltd 17 July 1975 [19 July 1974] 30103/75 Heading H2J An overspeed prevention device for a D.C. motor comprising rectifier means 8 for supplying power to the field winding 6 of the motor, a unidirectional element 24 for connection in parallel with the field winding, current reduction detecting means 25 connected in series between the element 24 and the rectifier means 8, and a protecting device operatively interlocked with said detecting means 25. As shown, the motor armature 5 is energized by a Ward-Leonard generator system which drives an elevator 1 in dependence upon the difference between a demanded speed and the actual speed, and the field winding 6 is energized by a thyristor circuit controlled in dependence upon the difference between a preset current and the actual current flowing in the winding 6. Should the thyristors 81, 82 become unable to conduct by being broken, or no gate pulse can be produced by failure of the phase shifter 11, thereby cutting off the power supply to the winding 6 and causing the motor to overspeed, the inductance in the winding 6 causes the field current to flow in the closed loop of winding 6, relay 22, diode 24 and winding 6, but the current at the output of the rectifier means 8 is brought immediately to zero. Therefore the detecting means 25, a current relay, is turned off immediately and contacts 251-253 are opened instantly, the elevator 1 being stopped by the release of an electromagnetic brake 20, and the current supply to the armature 5 being turned off. With the complete extinction of the field current, the current relay 22 is also turned off thus opening contacts 221-223.
Patent GB-1131675-A (GB)
Title: Semiconductor device
IPC: H01L27/02
Filed: 1967-06-29
Abstract: 1,131,675. Semi-conductor devices. HITACHI Ltd. 29 June, 1967 [11 July, 1966], No. 30144/67. Heading H1K. Regions of enhanced conductivity are provided at the surface of a semi-conductor body to prevent current passing between separated devices by an inversion layer which would otherwise be formed under metallic tracks running across the passivation. As shown in Fig. 3 a NOT unit is formed by a P-channel enhancement mode IGFET 12a, 14b, 13a the maximum gate potential of which is clamped to the breakdown voltage of a diode 16a, 11a. Parasitic IGFET action (16a, 17b, 12a) is prevented by the provision of a N<SP>+</SP> region 11b. Particularly if the extent beneath the surface conductors of the highly doped region is large, sharp capacitance variations between conductors and the semi-conductor substrate are also prevented. Reference has been directed by the Comptroller to Specifications 1,059,739 and 1,051,720.
Patent GB-837138-A (GB)
Title: Motion picture camera
IPC: G03B1/12
Filed: 1957-09-26
Abstract: 837,138. Spring motors. HANDLER, A., and VOCKENHUBER, K. Sept. 26, 1957 [Sept. 28, 1956], No. 30201/57. Class 10. The spring drive of a cine camera is automatically stopped when the spring torque reaches a predetermined value by the coaction of a rotary stop carried by one of two coaxially mounted gear-wheels with a counterstop on the camera casing. In the apparatus shown, gear-wheels 1, 2, Figs. 1, 2, respectively fixedly and freely mounted on a shaft 3 with the latter wheel having one tooth more than the former, are rotated by a gear-wheel 11 of the spring drive such that although the wheels are rotating in the direction of arrows 12, the wheel 2 moves relatively in a direction 13. The wheel 2 has a slot 6 formed therein, with notches 9, 10 associated with respective end faces 7, 8, which accommodates a spindle 4 by which a rocker 5 is pivotally mounted on the wheel 1. The rocker carries pins 14, 17 which contact the upper edge of the slot 6 and engage respective arcuate channels 19, 20 in the wheel 1. When the spring has run down such that the pin 14 abuts the slot end face 7 the pin is guided into the notch 9-a rocker movement which causes its face 15 to move outwardly into the path of the counterstop 16 on the camera casing. The apparatus allows a similar drive stopping movement to take place whilst winding the spring. In this case the relative movement of the wheel 2 is in the direction of the arrows 12 and the pin 17 engages the slot notch 10 to move the rocker into the relative path of the stop 16. In a modified apparatus the spring torque values at which running down or winding may be arrested may be adjusted by varying the effective length of the slot 6 by a shutter 30, Fig. 4, which is adjustably mounted about the shaft 3. The pivoted rocker 21 is held by a tension spring 23 connected to the shaft 3 by a ring 22.
Patent GB-1249461-A (GB)
Title: Improvements in or relating to continuous wave radar systems
Inventor: CLARE JOHN DICKENS
IPC: G01S13/536
Filed: 1955-10-21
Abstract: 1,249,461. Doppler radar. SUPPLY, MINISTER OF. 11 Oct., 1956 [21 Oct., 1955], No. 30222/55. Heading H4D. In a c.w. Doppler radar system for the detection of moving targets, amplitude and frequency variations, i.e. clutter, in the received signal at 7, due to noise modulated signals at the transmitter 1, are removed by a cancelling signal derived from the transmitter 1. The waveforms of the clutter at the receiver and the cancelling signal are in antiphase to each other and when applied in opposition, leave the required echo signal containing the Doppler shift due to target motion. To separate the Doppler signal, the received echo signal and the transmitter output are applied to a detector 13 the output of which is at the Doppler frequency. To maintain the cancelling signal equal in amplitude to the receiver signal, an amplitude comparison circuit 18 controls the gain of an I.F. amplifier 15 producing the cancelling signal, in response to both the cancelling and received signals. For the Doppler separation process it is necessary that the receiver signal and the signal from the transmitter output be correctly phased in order to prevent the reintroduction of amplitude variation, or clutter. Thus, a phase adjusting circuit 19 is inserted before the amplifier 15, producing the cancelling signal, and is controlled by a phase comparison circuit 19 responsive to the cancelling and receiver signals. In a modification the amplitude and phase comparison may be effected at intermediate frequency and cancellation at radio frequency.
Patent GB-904805-A (GB)
Title: Method and equipment for simultaneously determining, in suspension and emulsions, the sedimentation and the rate at which this takes place
Inventor: PAULIK FERENC
IPC: G01N15/04
Filed: 1960-09-02
Abstract: 904,805. Measuring electrically. METRIMPEX MAGYAR MUSZERIPARI KULKERESKEDELMI VALLALAT. Sept. 2, 1960, No. 30307/60. Class 40 (1). [Also in Group XX] Separation of suspensions or emulsions is examined by recording the variations in weight of a float or balance pair immersed in the suspension or emulsion, and simultaneously measuring the rate of change of weight using a derivation apparatus on the balance. If a float 3 is used, the initial specific gravity of the fluid is first determined in known manner and weights are added to pan 4 to balance the float. The sensitivity of the balance is then reduced by placing weights on pan 8 on the balance pointer 6. Light from lamp 10 shines through a slit 9 on pointer 6 and is focused on to light-sensitive paper on a clockwork driven drum 12 giving a record of the variation of weight of the float and hence the variation of specific gravity of the fluid. If a suspension of fairly large particles is being tested, a scale pan may replace the float, the variation in the weight of deposited material then being determined. The light-sensitive paper may be calibrated by using a template 13 and lamp 14, and time markings are applied by flashing lamps 15, 16. The derivative of the weight curve may be obtained by suspending a permanent magnet (or electromagnet) 17 from the balance beam and surrounding it by a fixed coil 18 connected to a galvanometer 19, which has a mirror reflecting light from lamp 20 on to the lightsensitive paper on drum 12. Alternatively, a plate with a wedge-shaped slit (Figs. 2 and 3, not shown) may be mounted on the balance pointer in front of a photo-electric cell with a vertical slit. Current proportional to the deflection of the balance results and its derivative is obtained by feeding it through a transformer or a C.R. network to a galvanometer. If a torsion balance is employed it may be used as a self-zeroizing arrangement, using a motor fed via an amplifier from the photo-electric cell. Alternatively, a double photo-electric cell may feed a servomotor connected to a recording appliance. Specification 865,073 is referred to.
Patent GB-610722-A (GB)
Title: Improvements in colour television and photographic apparatus
IPC: G03B33/16
Filed: 1945-11-14
Abstract: 610,722. Colour television. RADIO CORPORATION OF AMERICA. Nov. 14, 1945, No. 30419. Convention date, Dec. 16, 1944. [Class 40 (iii)] [Also in Group XX] In a colour television system comprising a plurality of colour separation filter elements, the elements have conjointly variable colour absorption ratios from substantially full colour to a substantial transparency, whereby the degree of colour saturation introduced by the system may be controllably varied. The invention is applicable to systems wherein the filters are either sequentially or simultaneously operative. In a system where each component colour is selected sequentially, a filter 11 in the form of a rotating disc is divided into three portions transmitting red, green and blue light respectively. The filter is constructed so that the outer edges of the disc allow light of sub, stantially one colour only to pass, but as the centre of the disc is approached more and more white light is transmitted until at the centre the filter is substantially transparent. The disc is driven by a motor 23 synchronized with the remainder of the television system and mounted on a base 33 which may be elevated or lowered by a rack and pinion (not shown). The light from an object, following the path 27, passes through the filter and a lens system to the television camera 45, the output of which comprises video signals to which are added synchronizing and blanking signals in the unit 50. When the filter is fully elevated, black and white pictures are transmitted and when it is fully lowered, the pictures are in full colour, the degree of saturation being indicated by a pointer 39. A crank and lever is attached to the base 33 to vary a gamma or contrast control in the unit 48 to suit the degree of colouration of the picture transmitted. A colour filter 31 such as that disclosed in Specification 599,134 may be inserted in the light beam path to provide colour balance. In a modification, Fig. 2 (not shown), the colour separation filter comprises a drum in the form of a frustum of a pyramid. In Fig. 5 (not shown) is illustrated a filter constructed so that the transparent portions are at its peripheral edge. Fig. 3 (not shown) illustrates a system in which the colours are selected simultaneously, the light beam being split into a number of paths in each of which is placed a filter, these filters being operable together from a single control. The separate light beams are applied to a plurality of television cameras or to a single camera with a plurality of targets and the signals from the cameras are either selected sequentially and transmitted over a single channel or transmitted simultaneously over a plurality of channels.
Patent GB-484988-A (GB)
Title: Improvements relating to soldering materials
IPC: B23K35/36
Filed: 1936-11-09
Abstract: A solid or plastic soldering-flux comprises a resin having incorporated therein an amount of one or more organic halogen compounds, in which one or more halogen atoms are directly attached to carbon atoms, which is less than the amount of the resin, and is either dispersed in a finely divided form or in true or colloidal solution.  Suitable resins are colophony, shellac, dammar resin, mastic resin and guaiac resin.  A plasticizer, e.g. turpentine, may also be added.  The flux may be contained within a hollow solder member.  Examples of the halogen compound are butylchloral hydrate and chloral hydrate.  Specification 323,392, [Class 82 (ii)], is referred to.
Patent GB-520207-A (GB)
Title: Improvements in or relating to leading-in insulators for high tension current
IPC: H01B17/34
Filed: 1938-10-21
Abstract: 520,207. Insulators. LODGE-COTTRELL, Ltd. (Siemens-Lurgi-Cottrell-Elektrofilter-Ges. fur Forschung und Patent Verwertung). Oct. 21, 1938, No. 30554. [Class 36]. A high-tension lead-in insulator, more particularly for use in electrofilters, comprises a lead-in conductor passing through an insulator, the lower end of the insulator dipping into insulating liquid contained in a vessel suspended beneath the insulator and carried either by the insulator or the lead-in conductor. Fig. 1 shows a lead-in conductor 3 and a surrounding insulator 1 passing through the top 5 of an electrofilter chamber 7, the insulator carrying at its lower end a vessel 2 filled with insulating liquid which has access to the interior of the insulator through holes 1a. To prevent dirty gases in the chamber 7 from coming into direct contact with the insulator an annular trough 4 surrounds the vessel 2 and the liquid is circulated from the vessel to the trough so that an oil screen 13 is formed between these two members. As shown in Fig. 2 the insulator comprises coaxial sleeves 14, 16, tne inner of which carries the liquid-containing vessel 21. A 'baffle 26 prevents access of dirt) gas to the insulator ; clean gas may be supplied through a pipe 27 for the same purpose. The insulator may be heated by an electric or other heater 19, whilst pipes 17, 18 may be provided to allow the liquid to be circulated for purification. In the construction shown in Fig. 4 the liquidcontaining vessel 31 is carried by the lead-in conductor and is arranged within a conical chamber 29, the cover 30 of which is formed with a sleeve 34 surrounding the insulator and preventing contact of gas therewith. In a modified construction the upper end of the vessel 31 is inwardly directed and a cylindrical throat connects the chamber 29 to the wall of the discharge chamber. In another construction, a spherical vessel, open at the top, is carried by the lead-in conductor and surrounds ,the lower portion of the insulator. Fig. 8 shows a liquid-containing vessel 55 carried by a lead-in conductor and surrounding the end of an insulator 53 which is provided with an upstanding skirt 56 forming a second liquidcontaining vessel.
Patent GB-465352-A (GB)
Title: Improvements in or relating to coking apparatus
IPC: C10B15/00
Filed: 1935-11-05
Abstract: 465,352. Apparatus for low-temperature carbonization. PUENING, F. Nov. 5, 1935, No. 30555. Convention date, Nov. 7, 1934. [Classes 51 (i), 51 (ii), and 55 (i)] In apparatus for low-temperature carbonization of the kind in which an outer casing 3 encloses movable heating walls 1 through which heating gases are continuously recirculated, the roof of the casing 3 is constituted by upward extensions of the walls 1 and by movable covers which close the upper ends of the coking chambers. The upper surfaces of the heating walls are covered with insulating material 9 and carry brackets 8 to which are secured suspension members 6 and links 60, the latter being connected to mechanism for " spreading" the walls 1 to facilitate discharge. The heating gases are supplied by burners 26 projecting into each wall 1 and by a burner 25 common to all the walls, flues 16, 17, 19, 22 and openings 10, 18, 20, 21 being so arranged in relation to a fan 24 as to provide for continuous circulation of the gases as shown by the arrows in Fig. 1. The surplus gases escape through a chimney 35 and dampers 30, 40 are provided in connection with the pairs of openings 10, 18 and 20, 21 to enable the direction of circulation to be reversed. The walls 1 are fitted internally with vertical baffles 11, 12, the upper parts of the latter being protected by shields 33, 34 against direct action of flames from the burners 26. The elbows 15 which .connect the walls 1 with the flues 16, 17 are protected by loosely fitting removable covers 45, the joints between which and the upper faces of the walls are rendered gas-tight during the coking period by clay filling 47. Fig. 3 shows a modification in which the fan 24 and burner 25 are omitted, each wall 1 being divided by plates 48, 49, 51 into four flues 52 .. 55, and the circulation being effected by upwardly directed burners 56 disposed in alternate flues 52, 54. The gas supply pipes 58 to the burners are enclosed in the air conduits 57 and are fed from a header 69 through piping 67 disposed within the conduit 63 which connects the air supply header 66 to pipes 61, 62, 59 delivering to the burner conduits 57. The headers 66, 69 are mounted on a truck 71 which, with the entire gas and air supply system, can be moved to transfer the burners 56 to the adjacent flues 53, 55 and thus reverse the direction of circulation. The surplus gas escapes through a U-shaped pipe 74 disposed within a water trough 75 into which depends a hood 77 sealing the opening in the upper part of the casing 3.
Patent GB-972607-A (GB)
Title: Seal and flexible gear type coupling
IPC: F16D3/18
Filed: 1962-08-09
Abstract: 972,607. Universal joints; packing. L. H. SAHLMANN, and J. J. KANE. Aug. 9, 1962 [Nov. 20, 1961], No. 30558/62. Headings F2B and F2U. In a gear coupling comprising a sleeve 11 and a shaft hub 12, axial outward movement of the hub in the sleeve is limited by a seal ring 16 retained by circlips 27, and comprising an internally and externally channelled ring containing 0-rings 21, 23, and having one outer land removed to provide a chamfered edge 22 facilitating assembly of the outer 0-ring 23. A removable plug 32 in the sleeve permits introduction of lubricant.
Patent GB-1204469-A (GB)
Title: Improvements in the reversing mechanism of rollover ploughs
IPC: A01B3/426
Filed: 1969-06-17
Abstract: 1,204,469. Plough reversing mechanism. INTERNATIONAL HARVESTER CO. 17 June, 1969 [18 June, 1968], No. 30564/69. Heading A1B. A reversing mechanism for a reversing plough comprises a drawbar hitch pivotally mounted on the lower arms of a tractor three point hitch and on which a reversible portion of a plough with conventional locking means rotatably mounted such that plough reversal is effected by gravity in such a manner that towards the end of the reversal, the kinetic energy of the reversing rotational movement lifts the entire plough to damp the rotation. On an upright 14 attached to the drawbar hitch is pivoted a rocker-arm 12, one end of which is pivotally mounted to the upper arm 8 of the three point hitch, the other end rotatably mounting a closed loop member 21 biased by a spring 25 to substantially the position shown in Fig. 2. Rotatably mounted about an axis on a pivot pin 18 on the reversible portion of the plough eccentric to the plough rotational axis, is a reversing lever 17 of adjustable length having means such as the notches 22 to engage the pin 24 forming part of the closed loop member 21 and abutment means formed by the longitudinal slot 28 in Fig. 2 in which pin 23 is mounted to limit the downward movement of the reversing lever 17 with respect to the rocker arm 12. A locking member 32 rotatably mounted at 33 engages a pin 35 on the rocker arm thereby locking it. The plough is raised by means of the three point hitch and the rocker arm released and on releasing the conventional plough locking means the weight of the plough causes the rocker aim to rotate about pin 13 and engagement of pin 24 in a notch 22 causes the reversing lever 17 to be raised thereby rotating the pivot pin 18 and consequently the plough. After rotating so far, the rocker arm abuts a stop member 37 and the biasing of the closed loop member 21 is such that it disengages from the notch 22. Rotation of the plough continues until the top slot 28 abuts pin 23 when further rotation causes the entire plough to lift.
Patent GB-699967-A (GB)
Title: Improvements in and relating to hinge means for hingedly connecting a swinging closure to a vehicle body
IPC: E05F1/12
Filed: 1950-12-15
Abstract: 699,967. Door operating appliances ; hinges. BRIGGS MANUFACTURING CO. Dec. 15, 1950 [Jan. 6, 1950], No. 30674/50. Classes 65 (i) and 65 (ii) Hinge means connecting the lid A of a luggage compartment to a vehicle body B comprise an arm 10 secured to the lid, a link 24 pivoted at 22 to the arm and at 30 to the body, a link 48 pivoted at 56 to the arm and connected to the body for limited movement in the direction of its length, and spring means for urging the lid towards open position, the arrangement being such that link 48 moves endwise in one direction into engagement with the body to hold the lid releasably when the latter is swung open, and is also movable in the other direction to release the lid when the latter is swung in the closing direction. Link 48 is formed at one end with a slot 52 engaging a fixed pivot 50. An arm 64, pivoted at 68 and biased in the clockwise direction by a spring 78, abuts a pin 66 carried by link 48 to urge the latter in the dooropening direction. Pivots 30, 50 and 68 are carried by a bracket 34 welded to a body partition 42. A nose 60 on link 48 slides, during movement of the lid, along a flange 44 concentric with pivot 50, and is urged by arm 64 into an opening 88 in the flange when the lid is fully open. The relative position of the links in the closed position of the lid is such that the latter is urged by arm 64 to the closed position. An adjustable screw 96 on arm 10 abuts a boss 94 on link 24 in the closed position of the lid to prevent rattle.
Patent GB-460800-A (GB)
Title: Improvements in or relating to carbon brushes for electrical apparatus
IPC: H01R39/20
Filed: 1935-11-06
Abstract: 460,800. Brushes for dynamo-electric machines. MORGAN CRUCIBLE CO., Ltd., PERRY, R. J., and WIGGS, A. E. Nov. 6, 1935, Nos. 30701/35, 316/36, and 28704/36. [Class 35] Voids or channels are produced in carbon brushes during the course of manufacture. These may be disposed at random or may extend from face to face in the brush. The voids may be formed by carbonizing fabric embedded in the carbon or metal insertions may be caused to shrink or disappear by volatilizing them or by treating them with a chemical reagent.