baber/WOPTO huggingface dataset:
Patent GB-696693-A (GB)
Title: Arrangements for the speed, torque and voltage control of dynamo-electric machines with pilot motor operated control system
Filed: 1950-12-07
Abstract: 696,693. Automatic control systems. LAURENCE, SCOTT & ELECTROMOTORS, Ltd., SCHWARZ, B., and SCHWARZ, K. K. Dec. 7, 1951 [Dec. 7, 1950], No. 30007/51. Class 38 (iv). [Also in Group XXXVII] In an automatic control system for an A.C. commutator motor in which a voltage proportional to the motor speed or the linear speed of a, web, or the cutting speed of a machine tool, or the level of a liquid, is opposed by a reference voltage and the resultant applied to a polarized relay controlling a reversible servomotor driving an induction regulator supplying the rotor of the commutator motor, a two-way rectifier or other non-linear resistor is connected in series with the relay coil for the purpose of stabilizing the relay and discriminating between large and small signals. The voltage proportional to speed of the motor 1, is obtained by adding to the rotor voltage, a voltage which is in phase with the rotor voltage and is obtained from a transformer 14, and a voltage proportional to stator current obtained from a current transformer 15. This voltage is rectified at 13 producing across a resistor 12, a D.C. signal which is opposed by a reference voltage (derived from rectifier 10) and the resultant is applied to the coil of the polarized relay 5 which controls a reversible motor 4 actuating the induction regulator 2 which is controlling the supply to the rotor of the motor 1. A pair of reversely-connected rectifiers 6 is connected in series with the relay coil and another pair 7 is in parallel with the coil to protect it from voltage surges. In a modification, Fig. 2 (not shown), the speedresponsive voltage is obtained from a D.C. tachometer generator excited from an auxiliary rectifier. In a further modification, Fig. 3 (not shown), the D.C. tachometer has its field excited in accordance with the stator current of the motor so that its output is proportional to the product of motor torque and motor speed-i.e. motor power. In another modification, Fig. 4 (not shown), the speed-responsive voltage is obtained by adding the voltage proportional to stator current to a voltage tapped off a potentiometer, the slider of which is positioned in accordance with the setting of the induction regulator. It is further stated that the tachometer generator may be driven by a measuring roll so as to maintain constant the linear speed of a strip of material in a reeler drive; that the field of the tachometer may be excited in accordance with the position of a tool holder to maintain constant the cutting speed of a boring mill; that the potentiometer of Fig. 4 may be responsive to the position of a float instead of to the position of the induction regulator and thereby control the level of a liquid; and that the relay circuit may be applied to an unspecified A.C. or D.C. geneator or a D.C. motor.
Patent GB-396084-A (GB)
Title: Wave filter circuits
IPC: H03H7/01
Filed: 1931-10-29
Abstract: 396,084. Impedance networks. CAUER, W., 35, Friedlõnderweg, G÷ttingen, Germany. Oct. 29, 1931, No. 30049. Convention date, Dec. 6, 1930. [Class 40 (iii).] Specification 350,498 describes filters which are so dimensioned as to yield prescribed image-impedance and attenuation characteristics with a minimum number of impedance elements. The symmetrical forms of these filters are equivalent to filters made up of bridge sections having pairs of opposite arms whose impedances are respectively 31 and 32 and the invention described in the former Specification consists in choosing the values of #(3132) and #(31/32) from a set of tables given in the Specification, the following being a typical value: m(#2+#<2>a)#(#<2>+#<2>-1)/(#<2>+#<2>-a)#(#<2>+#<2>1); #<2>+#<2> = o,# is 2# times the frequency, and the remaining quantities are arbitrary parameters, #1 and #-1 being the cut-off frequencies while #a, #-a are frequencies corresponding to poles or zeros of 31 and 32. For certain non-dissipative band-pass filters Fig. 1 shows #(3132) on a logarithmic scale against #, where #=(2#-#1-#-1)/(#1+#-1). It shows only the positive halves of the curves, the rest of the Figure being a mirror image reflected in YY<1> for even Cauer classes and comprising reciprocally related curves for the odd classes. The curves c, d, e, f, corresponding to successively higher classes (i.e. to greater numbers of filter elements) lie successively closer to the line 001 for which #(3132) = R, where R is the terminal impedance of the filter. Each curve oscillates between maxima and minima which are numerically equal for that curve ; it is then said to exhibit " Tschebyscheff behaviour," and the invention consists in choosing the parameters (i.e. resonances and anti-resonances) of a filter in relation to the data of a given problem so that the filter shall exhibit such behaviour. The value of log H, corresponding to the distance OQ, is determined by the degree of uniformity which has to be attained up to the limit represented by K. The remaining data relate to the attenuation curves outside the transmission band, and examples of such curves are given in Fig. 2, where the attenuation A1 (a function of #(32/31) for a band-pass filter) in nepers is plotted against # for the right-hand part of the' complete diagram, when # > 1. There is a symmetrical set of curves for the corresponding part where #<-1. Curves 1 .. 6 relate to Cauer's filter-classes 1 .. 6, which are distinguished by the numbers of elements which they contain. To each pair of lines PP<1>, QQ<1>, Fig. 1, there corresponds a line of minimum attenuation RR<1>, Fig. 2, and the curves shown are so chosen that they touch this line except in their left-hand branches. These branches cut the line at different abscissµ, the abscissa OK3 being shown for curve 6 ; and the permissible size of the distance OK3 is a further datum of the problem. The Specification gives examples of the manner in which the Tschebyscheff parameters are to be calculated, and refers to published work in which the theory is extended to dissipative networks.
Patent GB-388708-A (GB)
Title: Improvements in or relating to carrier cycles
IPC: B62J7/00
Filed: 1932-10-27
Abstract: 388,708. Luggage-carriers. HERCULES CYCLE & MOTOR CO., Ltd. and CRANE, H. A., Rocky Lane, Aston, Birmingham. Oct. 27, 1932, No. 30095. Addition to 383,479. [Class 136 (i).] In order to increase the rigidity of a carrier formed in two or more detachable sections as described in the parent Specification, auxiliary supporting-members are provided between one section of the carrier and the attachment means for another section to form one or more triangulated structures. As shown, two inclined stays l extend between lugs or clips on the rear member of the upper frame a and the boss to which the lower supporting-tubes fare connected, the flattened lower ends of the stays being secured to the boss by the same bolts which hold the tubes f. In a modification, the stays l are replaced by inclined tension members extending between lugs or clips on the tubes f and the boss to which the tubes b are connected.
Patent GB-303960-A (GB)
Title: Improvements in and connected with sanitary towels
IPC: A61F13/15
Filed: 1927-11-10
Abstract: 303,960. Strathearn, J. S. Nov. 10, 1927. Catamenial appliances. - A sanitary towel comprises an easily disintegrated pad B and a sheet of medicated gauze H surrounded by a gauze cover A extending at both ends but at one slightly more than the other; the ends are slit and knotted at E and knotted again at G to form loops. The material of the pad B is cut cross-wise to prevent it from breaking away when in use. In a modification the ends of the gauze are knotted to separate loops.
Patent GB-899020-A (GB)
Title: Electroplating bath and process
IPC: C25D3/60
Filed: 1960-09-01
Abstract: 899,020. Tin-nickel alloy electroplates. METAL & THERMIT CORPORATION. Sept. 1, 1960 [Sept. 8, 1959], No. 30207/60. Class 41. An electroplating bath containing tin and nickel to be deposited as an alloy plating is improved by adding a small amount of a sulphonated fluorocarbon, to reduce pitting. The carbon ring comprises a cyclo-hexyl ring, and one or more C atoms may have alkyl side chains to total up to 9 C atoms including the hexyl ring, e.g. per-fluoro methyl cyclo-hexyl sulphonic acid, which may be converted to an alkali metal or ammonium salt. Nickel chloride and stannous chloride are used in a bath and neutralised with ammonia to pH 2 to 2.5. Sodium or ammonium fluoride or bifluoride may be present.
Patent GB-1470247-A (GB)
Title: Devices for indicating direction of rotation
IPC: G01R31/34
Filed: 1974-07-08
Abstract: 1470247 Sensing direction of rotation BRITISH NUCLEAR FUELS Ltd 25 June 1975 [8 July 1974] 30263/74 Headings G1K and G1N The direction of rotation of a body inside a casing 32, Fig. 2, accompanied by a corresponding rotation of a magnetic field 31, is determined by the sense of the phase angle between the signals induced in pick-up coils 4, 5 in a box 3 held near the casing 32. The pick-up signals are combined in amplifier 13, Fig. 4, and phase rectified at 15 to produce a positive or negative displacement of the pointer of a centre-zero meter 9, depending on the direction of rotation. The two signals may alternatively be displayed on a CRO, and the frequency measured to determine the speed of rotation.
Patent GB-952864-A (GB)
Title: Internal shoe drum brakes
Inventor: DAVIS JOHN WALTER
IPC: F16D65/14
Filed: 1959-09-05
Abstract: 952,864. Internal shoe drum brakes. GIRLING Ltd. Dec. 2, 1960 [Sept. 5. 1959], No. 30399/59. Heading F2E. In a drum brake having leading and trailing shoes fulcrumed at one end on one or a pair of abutments and separated at their other ends by a floating expander, e.g. piston and cylinder, the assembly is resiliently urged in one direction and the movement is limited by a stop engaging the expander itself. In one embodiment, Fig. 1, the shoes 10, 11 fulcrumed at one end on a pair of abutments 13 adjusted by a wedge 14 having cam surfaces of unequal inclination to compensate for increased wear of the leading shoe 10. A cylinder 15 and piston 16 are arranged between the other ends of the shoes, the cylinder being guided in a slot in a back plate and having lugs 18, 19 engageable with a stop 17 secured to the back plate. A compression spring 21 urges the assembly in a direction to engage the lug 18 with the stop 17. In a modification, Fig. 2, the cylinder 21 is guided in slots 22 in a pair of plates 23, 24 in turn slidable in the back plate against the frictional resistance of spring washers 26. When this arrangement is used the wedge 14 is replaced by one having equally inclined surfaces, so that the assembly can take up different rest positions as the wear on the leading shoe becomes progressively greater than that on the trailing shoe. One of the washers 26 has an extension 31 to urge the cylinder resiliently towards one end of the slots 22. In a further modification (Fig. 5, not shown), in which the wedge also has equally inclined surfaces the cylinder has lugs and a spring similar to the lugs 18, 19 and spring 21 of the Fig. 1 form, but the stop 17 is replaced by a stop pin which is slidable relative to the back plate against frictional resistance, for the reason described above. Such a slidable stop pin 43 is shown in the embodiment of Fig 3, friction being applied by a spring-loaded washer 49. In this embodiment, however, the abutments 37, 38 are fixed and adjustment for wear is effected by a tappet 41 threaded in the piston 42 of floating cylinder 39. In this construction the pin 43 engages between the open end of the cylinder and a flange on the piston and is wedged towards the former by a spring 45. In a further modification (Fig. 4, not shown), the tappet is threaded in the cylinder instead of in the piston, the cylinder having a pair of lugs and a spring arranged as the lugs 18, 19 and spring 21 of the Fig. 1 embodiment, but engaging a pin similar to the pin 43 of the Fig. 3 embodiment.
Patent GB-487301-A (GB)
Title: Improvements in and relating to box packages to contain paper serviettes, paper lace doyleys and like table stationery
IPC: B65D5/54
Filed: 1937-11-23
Abstract: 487,301. Boxes or holders for paper serviettes &c. BRADY, E. G. Nov. 23, 1937, No. 30555. [Class 18] [Also in Group XIV] The front and rear faces of a box to hold paper serviettes &c. are cut through along decorative lines such as AB and the part of the front face above this line is removed or apertured to permit the contents to be viewed. On the side faces of the box lines are marked joining the ends of the cuts AB so that, when the marked lines are cut through, the upper part of the box can be removed, and the lower part will then act as a stand or holder for the serviettes &c.
Patent GB-613045-A (GB)
Title: Improvements in or relating to transformers
IPC: H01F30/02
Filed: 1945-11-15
Abstract: 613,045. Transformers. AKT.-GES. BROWN, BOVERI, & CIE. Nov. 15, 1945, No. 30586. Convention date, Dec. 15, 1944. [Class 38 (ii)] A single-phase auto-transformer provided with a tertiary winding and adapted for use in the coupling of three-phase, high-tension, longdistance networks, is characterised in that windings arranged on a cylindrical core with laminations arranged radially or in the form of an involute curve receive a reactance voltage of the order of magnitude usual with transformers of separate windings by so dimensioning the width of the auto-connected winding- radially in cylindrical windings and axially in sandwich windings-that they generate a corresponding leakage flux, the whole winding body being cage-wise surrounded by return path packets of laminations arranged all round the core in such manner that the leakage flux produced is practically absorbed by the edges of the laminations of the magnet frame. The tertiary windings are connected in delta across the three phases. Fig. 1 shows the cylindrical core a with U-shaped return laminations rranged radially in packets b which have collector laminations g secured laterally on the intermediate limbs to ensure that the leakage flux is substantially absorbed by the edges of the laminations; the leakage flux distribution is shown in Fig. 1a. The auto-transformer windings, in disc or sandwich form, comprise the high voltage winding c with input lead U<SP>1</SP>, and the lower voltage winding divided into two portions d<SP>1</SP>, d<SP>2</SP> with a common lead u, the latter portions having their outer ends connected to the earthed star-point o. The tertiary winding is divided into two parts e<SP>1</SP>, e<SP>2</SP> with leads x<SP>1</SP>, x<SP>2</SP>. A concentric or cylindrical form of winding may be employed, particularly when the tertiary winding is connected to a synchronous motor for power factor improvement. In this case, the tertiary winding is in two cylindrical parts on the inside and outside respectively of the other cylindrical windings and thus has a double flux field linkage with the auto-connected windings. The collector laminations for the linkage flux are secured on each side of the shorter limbs of the U-shaped laminations.
Patent GB-254180-A (GB)
Title: Improved reflector for motor vehicle lamps
IPC: F21S8/10
Filed: 1925-12-04
Abstract: 254,180. Saunders, J. S. Dec. 1, 1925. Vehicle and like lamps.- In a vehicle or like lamp, a source of light 10, which is carried by an inclined holder 9, preferably is arranged midway between the sides of a reflector 2, being placed higher up in relation to the reflector for a side lamp than for a head lamp.
Patent GB-953077-A (GB)
Title: Improvements in or relating to methods and means for developing electrostatic imagesand patterns
IPC: G03G9/12
Filed: 1960-09-06
Abstract: 953,077. Xerographic development. RESEARCH LABORATORIES OF AUSTRALIA Ltd. Sept. 6, 1960 [Sept.9, 1959], No.30703/60. Heading G2H. A method of developing xerographic images consists in using a solid developer prepared by suspending pigment particles in a carrier which is normally in a solid state and has an electrical resistivity sufficiently high to avoid destruction of an electrostatic image during development, and developing the latent electrostatic image on a base by applying the developer to the base and controlling conditions to render liquid the carrier where it contacts the base by either melting it or dissolving it so that the electrostatic image causes the pigment particles to deposit from the liquefied carrier. The carrier preferably has an electrical resistivity of at least 10<SP>9</SP>ohm cm and a dielectric constant less than 3 and may be tetrachlorodifluoroethane; paraffin wax, beeswax, carnauba wax, colophony, copal, dammar, dragons' blood, guaiacum, naphthalene and hydroquinone. The pigment may be carbon black, red iron oxide or phthalocyanine Blue.
Patent GB-431752-A (GB)
Title: Improvements in airship speed indicators
IPC: G01P3/36
Filed: 1934-10-26
Abstract: 431,752. Speed indicators. MEZZATESTA, G., 230, East 71st Street, New York, U.S.A. Oct. 26, 1934, No. 30726. Convention date, Nov. 3, 1933. [Class 106 (iii)] Speed - indicating apparatus for use particularly in indicating the speed of an aircraft relative to the earth comprises a swinging telescope 35 which is moved to keep in view an object over which the aircraft will eventually pass, and simultaneously operates, by means of a rod 28, a plate 27 and a valve-regulated, rarefactionproducing bellows 26, a diaphragm 4, the extent of movement of which indicates the speed. The valve regulating device consists of a valve 39 which admits air to the bellows and is opened more or less according to the altitude of the airship, the correct setting being determined previously by tests, such setting being shown by a pointer secured to the valve and moving over a dial 47. The diaphragm 4 is secured at its periphery to a fixed cylinder 3 and at its centre to a rack 5 which rotates a spindle 7 and a sleeve 10 having a lug 12 adapted to strike a pin 13 on a shaft 8 carrying the speed indicating pointer 18, so that the latter is only moved when the rack 5 moves to the right. A spring holds the pointer in the final indicating position. While the telescope is being brought into alignment with the point of reference, the operator holds open a valve 37 for the purpose of allowing air to enter and leave the bellows freely. The apparatus is mounted on a base 1 rotatable on ball bearings 58 carried by a member 59 which is adjustable about a pivot 60 by varying the inclination of pivoted links 69, 70. Modifications are described wherein (a) the rack 5 operates additional bellows supplying air to the main bellows, (b) the air within the main bellows is compressed instead of being rarefied, and (c) a liquid is used in the bellows. The apparatus may be used to determine the speed of the aircraft with respect to a moving object such as a train. It may also be used with a bombing sight.
Patent GB-385395-A (GB)
Title: Positive duplex shuttle motion for narrow multiple fabrics
IPC: D03D41/00
Filed: 1931-11-06
Abstract: 385,395. Small-ware looms. WALKER, G., 51, Milnbank Road, Dundee. Nov. 6, 1931, No. 30750. [Class 142 (ii).] In a loom for weaving narrow multiple fabrics two grooved shuttles are moved continuously in the same curved path, one passing above the other in the reed space, and one moving to the right whilst the other is moving to the left. The shuttles Sa, Sb, Fig. 12, are guided by fixed rails M and by rails N, which receive the shuttles and raise or lower them so that both may move through the same rectangular path. The shuttles are driven by the engagement with their slots S<3> of rollers C<2> on studs B4, Fig. 1, on slides on wheels B, rotated from the driving shaft, the roller C<2> engaging fixed cam slots J. The rails N connected by bars N<2> are raised and lowered by means of studs O, which engage slots on a lever Q, which is rocked about the driving shaft by means of a cam slot E<2> on a rotating wheel E engaging a bowl bolted on a slot in the lever Q.
Patent GB-191549-A (GB)
Title: New or improved device for wiping the wind screens of automobiles
IPC: B60S1/14
Filed: 1921-11-17
Abstract: 191,549. Payne, L. T. Nov. 17, 1921. Windows and the like, cleaning.-A cleaning device which is readily attached to the windscreen comprises a bifurcated clamp C adapted to slide along the edge of the screen A and be clamped at any point, and having a bearing for a spindle d carrying a spring E which supports the wiper B. One arm c of the clamp is provided with a fibre ring c<1> and the other arm c<2> carries a screw c<3> provided with a similar ring c<5> and adapted to grip the edge of the screen or the beading. The upper part of the clamp forms a bearing for the spindle d fixed to a sleeve d<1> on an operating nut D, the bearing and sleeve being cut away at d<3> to limit the turning movement of the spindle. The spring E passes through holes in the spindle and in a loose sleeve F, and is fixed by a nut H. At its other end the spring is clamped in a clip b<1> which carries loosely by means of a shouldered bolt b<2> the wiper B comprising a U-shaped metal strip b in which is detachably secured a rubber strip, the loose connection ensuring that the wiper is pressed evenly upon the glass.
Patent GB-464145-A (GB)
Title: Improvements in or relating to the manufacture of wooden frames, such as window frames, horticultural frames and the like
IPC: E06B3/984
Filed: 1935-11-09
Abstract: 464,145. Window and like frames. FARNELL, S. Nov. 9, 1935, No. 31018. [Class 20 (iii)] A window or horticultural or like wooden frame comprises members 1, 1<a>, 1<b> bevelled at the ends and connected by right-angled metal corner strips 3 sunk and secured in aligned grooves in the ends of the members and by corrugated spiked strips 7. The horticultural frame shown comprises a central bar 8, mortised into the members 1<a>, 1<b>, and a galvanized bar 10 crosses the middle and is nailed in grooves in the members 1 and 8. The members 1 are mitred on their lower faces for the narrower member 1<b>.
Patent GB-1267279-A (GB)
Title: Improvements in or relating to filtering centrifuges for the separation of solid matter and fluids
Inventor: GARRONE FELIPE URBANO
IPC: B04B3/00
Filed: 1970-06-26
Abstract: 1,267,279. Centrifugal strainer. F. U. GARRONE. 26 June, 1970 [23 July, 1969], No. 31072/70. Heading B1D. A centrifugal strainer drum of frusto-conical form comprises a set of concentric strainer sections which operate in parallel, a liquid solid mixture entering the individual, openended spaces 16 inwards of the strainer grids 1 at the drums narrow end and solids being discharged at the wide end. The sections each comprise a series of arcuate grids 1, supported by perforate plates 2, outwards of which imperforate plates 3 with flanges 4 define filtrate receiving chambers 18. Chambers 18 discharge into radial chambers 19, formed by channel sections 6, which discharge filtrate through apertures 7 in the outer tubular wall of the drum. The surrounding housing has filtrate outlets 12 and 13. The strainer is used to separate sugar from molasses and enables a larger filtering area to be enclosed within a given space than in conventional single section strainers.
Patent GB-727876-A (GB)
Title: Foldable desk
IPC: A47B17/00
Filed: 1953-11-10
Abstract: 727,876. Folding tables. COUSE, K. W. Nov. 10, 1953, No. 31073/53. Class 52 (3). A desk or table flap 8 supported by folding legs 12 is hinged at its rear edge between the side members 3 of a rectangular frame, and an auxiliary flap 9 carrying a cover 23 is similarly hinged and can be swung down into alignment with the main flap to form an extension, the cover then serving as a screen or windshield. The cover is flexible and mounted in grooves in foldable end cheeks 19 so that the parts can be collapsed within the confines of the frame 3 for transport.