baber/WOPTO huggingface dataset:
Patent GB-808530-A (GB)
Title: Improvements in or relating to transistor push-pull amplifiers
IPC: H03F1/30
Filed: 1956-08-02
Abstract: 808,530. Transistor amplifier circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. Aug. 2, 1956 [Aug. 5, 1955], No. 23857/56. Class 40 (6). In a transistor amplifier comprising at least one pre-amplifier stage feeding a class B or AB push-pull stage through a transformer, variations due to temperature of collector currents of the push-pull stage transistors are reduced by applying to these transistors a biasing voltage whose variation with temperature is determined by variation with temperature of the collector current of at least one of the pre-amplifier, transistors. The Figure shows two pre-amplifier stages 1, 2 feeding a class B or AB pushpull stage 4, 5, negative feedback being provided through resistor 10. The collector current of transistor 1 which itself is temperature dependent, or the combined collector currents of transistors 1 and 2, is passed through a resistor 7 to produce a voltage which is smoothed by a capacitor 6 and fed through a potentiometer 8, 9 to the transistors 4, 5 to maintain their collector currents constant. In an alternative arrangement (Fig. 2, not shown), the collector current of transistor 2 is fed to the centre tap of the transformer primary and the bias is derived from a potentiometer connected between one end of the transformer and earth. By this means the magnetization current of the transformer primary may be balanced out.
Patent GB-1389739-A (GB)
Title: Magnetic recording and or reproducing apparatus
IPC: G11B15/093
Filed: 1972-05-22
Abstract: 1389739 Recording and playback; tape transports SONY CORP 22 May 1972 [28 May 1971] 23898/72 Heading G5R A mechanical auto-stop device for a cassette recordersenses changes in tape tension, whereupon reduction gearing engages and is driven by the tape drive means and causes the eventual disengagement of the tape drive means if the abnormal tension is maintained for a predetermined time. The machine is rendered operative on moving a lever 3, pivoted at 2, to the position of Fig. 3. A record/playback head 71 and erase head 72 carried on a plate 10, a pinch roller 17 opposed to a capstan 16 and mounted on a lever 18 pivoted at 20, and a tension sensing arm 57 pivoted at 58 to the head plate 10, are moved thereby into engagement with the tape 54. Abnormal tape tension, e.g. occurring at the end of the supply reel of a cassette, causes the arm 57 to pivot against a spring 59, as in Fig. 3, engaging the arm end 61 with a pin 62 of a reduction gear assembly 40, which is thus pivoted at 20 against a spring 63. Gear 36 of the assembly 40 meshes with a gear 37 on the capstan shaft and drives a sector gear 38, via gears 35, 24, 23, clockwise at a fraction of the capstan speed. A pin 41 on the sector gear 38 is moved against a spring 43 and, if the abnormal tension is continued, eventually engages a lever 50 which moves the operating lever 3 to the inoperative position, Fig. 1. The pinch roller 17, heads 71, 72 and tension arm 57 are thus disengaged. The gear assembly 40 is returned to its disengaged position by a member 21, Fig. 1, attached to the pinch roller lever 18. The operating lever 3 is biased by an overcentre spring 7 between its two stable positions.
Patent GB-245521-A (GB)
Title: Improvements in or relating to vibration dampers for use on motor cycles, and the like
IPC: B62K25/24
Filed: 1924-10-10
Abstract: 245,521. Webb & Co., Ltd., H. C., and Atkinson, G. L. Oct. 10, 1924. No Patent granted (Sealing fee not paid). Vibration-dampers.- A vibration-damper for the front fork of a motor-cycle comprises a cylindrical bearing-surface or friction hand adapted frictionally to engage an oscillatory cylindrical element on the fork or steering- pillar, and means for adjusting the bearing- faces relatively to one another. In a linkmounted spring fork as shown, the spindle 8 of one of the link pivots carries a sleeve 9 fixed thereto and embraced by a split fraction band 10, which is provided with a radial extension 17 pivoted to the lower end of the steering- pillar 2, and with jaws 11 adapted to be drawn together by a screw-threaded spindle 12 engaging a threaded socket 13. The spindle 12 carries a sleeve 14, which is pressed against one of the jaws 11 by a spring 15 between the sleeve and a knurled head 16.
Patent GB-360862-A (GB)
Title: An improved lock and locking means for railway points operated by hand
IPC: B61L5/10
Filed: 1930-08-11
Abstract: 360,862. Locking railway points. CURRAN, J. W., Bombay Port Trust Railway Engineering Quarters, Nawab Tank Bridge, Mazagon, Bombay, India. Aug. 11, 1930, No. 24051. [Class 104 (i).] A locking device for railway points comprises a lever lock 1 fixed to the stock rail and provided with a strip 4 which engages the key 6 after it has been turned to release the bolt 3 from its slot 7, and prevents it from being withdrawn until it has been turned back to lock the bolt. The slot 7 is in a sliding plate 8 attached to the point rail, so that the bolt cannot engage the slot until the point is fully closed.
Patent GB-185740-A (GB)
Title: Cylinders for steam engines
IPC: F01B17/04
Filed: 1922-09-06
Abstract: 185,740. Sch÷nfeldt, H. Sept. 7, 1921, [Convention date]. Valve chests and casings.-In an engine cylinder having a separate valve-box mounted on facings c, d, the valve-box is located by flanges on the box engaging the facings and by flanges c', d<1> at each side of the facings, and is secured by bolts e screwing into bosses on the cylinder body. The latter is formed with a flange b by which it is secured to the framing.
Patent GB-207869-A (GB)
Title: Improvements in or relating to film delivering or winding apparatus suitable for kinematographs
IPC: G03B21/43
Filed: 1922-09-06
Abstract: 207,869. Way, E. J. Sept. 6, 1922. Variable-speed gearing.-Mechanism having a positive movement with the driving element of the gear is provided to vary the velocity ratio by substantially equal increments for each revolution of the carrier. The Figure shows a kinematograph projector in which the under surface 4 of a film carrier 1 forms a friction disc driven by a friction wheel 5 positively driven through gearing 9, 10, 11, 12 by the projector mechanism. The shaft 6 of the wheel 5 is longitudinally movable to vary the velocity ratio, and is rotatably but not slidably mounted in a carriage 15 travelling on guides 16 forming a radial extension of the framing 17. The carriage 15 is fitted with a roller 20 which enters a groove 22 in a drum 23 rotated through a friction clutch 29 and worm gearing 27 by the shaft 11. The, roller 20 is kept against one edge of the groove 22 by a spring-pressed pin 32 which engages the other edge of the groove, and the groove is cut so as to move the friction wheel 5 in the desired manner. The carriage 15 is provided with a pivoted arm 44 carrying a roller 46 which is brought into engagement with the innermost convolution of the film when the apparatus is being initially adjusted. Means are described whereby (1) the roller 46 may be disengaged from the film after the initial adjustment and (2) the position of the friction wheel may be adjusted if the film loop 35 increases or decreases in length during exhibition; a brake 53 engaging the edge of the carrier is also provided. The film is fed from the interior of the coil through a ring 36 to the projector, and after leaving the gate &c. passes through a tensioning device 58 to be wound on to a spool 54. The spool 54 is driven through a flexible shaft 56 by a friction wheel 55 engaging the under surface of the carrier. In a modification, the wheel 5 and carriage 15 are moved by a screw of even pitch which is rotated intermittently by a star wheel thereon engaged by a pin on the carrier 1 at each revolution. Specification 172,033 [Class 97 (i), Optical systems &c.], is referred to.
Patent GB-945922-A (GB)
Title: Dry friction sliding element
IPC: F16C33/04
Filed: 1962-06-22
Abstract: 945,922. Bearings. ADOLPH SAURER Ltd. June 22, 1962 [March 1, 1962], No. 24164/62. Drawings to Specification. Heading F2A. A dry friction sliding element for high working temperatures (600 to 800‹ C. and more) comprises a sintered body comprising powdered graphite, a binding agent and embedded preshaped granulated boron nitride, which may be approximately spherical or approximately prismatic in shape. The granules of boron nitride can be obtained by slicing up small rods of any cross-section.
Patent GB-1351907-A (GB)
Title: Devices for engaging corner pieces on containers
IPC: B66F9/18
Filed: 1972-05-23
Abstract: 1351907 Frames for handling containers VALMET DY 23 May 1972 [25 May 1971] 24176/72 Heading B8H [Also in Division E2] A frame 5 which is mounted on the lifting carriage of a lift truck 1 has securing means for engagement with the two corner pieces fixed to a container one at each of the two upper corners on one vertical side of the container, the said securing means comprising a supporting pin 6 and a locking lever 7 for engagement with each of said corner pieces. Each supporting pin 6 engages in an aperture in the side of the corner piece which is against the vertical side of the container while the associated locking lever 7 is pivotally mounted above the pin 6 on the frame 5 for engagement in an aperture in the side of the corner piece which is at the top of the container. The levers 7 are each pivotally connected to the piston rod 10 of a spring- loaded piston in a cylinder 8 and when it is desired to mount a container 4 on the frame 5 pressure fluid is supplied to each of the cylinders 8 and the respective pistons and piston-rods 10 therein move upwardly against the action of a spring 11, and by means of the piston-rods 10 the levers 7 are thus raised to theiropenposition. The pins 6 are then moved into their associated apertures in the side of the container 4 and a releasing pin 9 mounted adjacent the pins 6 is pushed inwardly by the container causing actuation of a pressure release valve (13), Fig. 4 (not shown) in an hydraulic circuit which causes the release of pressure in the cylinders 8 whereby the levers 7 are released into their locking positions shown in Fig. 3, with the aid of the associated springs 11.
Patent GB-1370258-A (GB)
Title: Process for manufacturing sulphur dioxide from ammonium sulphate
IPC: C01C1/02
Filed: 1972-05-23
Abstract: 1370258 NH3 and SO2 from sulphates INSTITUT FRANCAIS DU PETROLE DES CARBURANTS ET LUBRIFIANTS 23 May 1972 [27 May 1971] 24225/72 Heading C1A NH3 and SO2 are prepared by heating (NH<4>)2SO4 and/or NH4HSO4 with at least ¢ mole of (NH4)2S2O3 at a temp. of 150-400 C. The reaction mixture may contain up to 10 times the minimum quantity of thiosulphate. The reaction mixture may be an ammonical liquor obtained by washing SO2 and SO3 off gases with NH3, (NH4)2CO3 or aq. NH4SO3, or a mixture of (NH4)2SO4 and NH4HSO4 in the form of a melt which may contain 30-50% by wt. NH4HSO4, obtained evaporating the liquor. The salts may also be reacted in a fluidized solution containing an alkali metal salt, Al2O3, or SiO2-Al2O3. The reaction mixture may be heated using a combustible gas, e.g. CO, H2 or C1-C4 hydrocarbon.
Patent GB-1263780-A (GB)
Title: Piezoelectric ceramic compositions
Inventor: NISHIDA MASAMITSU
IPC: C04B35/50
Filed: 1969-05-13
Abstract: 1,263,780. Piezo-electric ceramics. MATSUSHITA ELECTRIC INDUSTRIAL CO. Ltd. 13 May, 1969, No.24358/69,. Heading G1J. A piezo-electric ceramic composition consists of a solid solution of a material defined by the area ABCDEF of Fig. 2 and further containing 0À1 to 5 weight per cent of manganese dioxide.
Patent GB-675091-A (GB)
Title: Apparatus for determining the most economical working speeds of machine cutting tools and other values related to the working speed
IPC: G06G1/00
Filed: 1948-09-16
Abstract: 675,091. Calculating-apparatus. HAFNER, E. Sept. 16, 1948 [Dec. 2, 1947], No. 24375/48. Class 106 (i). Apparatus for making calculations relating to the operation of machine-tools comprises a drum and a roller which are independently rotatable and bear appropriate markings viewed through apertures in a housing, and means for coupling the drum and roller for rotation together. The drum 12 is fast on a spindle 4 mounted in endplates 7, 8 of the housing 3 secured on brackets 2. The spindle 4 has an adjusting wheel 9 and at its other end has threaded on to it a sleeve 24 having a knob 23 by which the sleeve may be pressed against the roller 20, rotatable on the spindle 4, to couple the roller and drum. The roller 20 is integral with an adjusting- wheel 26 which is operated through an aperture in the housing. A sprung plunger 29 and a spring ball 18 engage notches in the roller 20 and drum 12, respectively, to locate them in their set positions, the action of the plunger 29 being stronger to hold the roller 20 still while the drum 12 is adjusted. The housing 3 is partially covered by a sheet 6 of transparent material, itself covered by a screen 11 carrying markings to identify windows 5 in the housing and screen through which the markings on the roller and drum may be observed. A pair of rollers 52, 53, rotatable on the spindle 4 and adjustable, respectively, by a wheel 51 and by an integral knurled portion operated through an aperture in the housing, carry logarithmic graduations and enable ordinary multiplication and division to be performed. The rollers 52, 53 are located by sprung balls 54, 56 mounted in the roller 52 and a wall 57 of the housing. The screen 11 may be rotatable in the housing 3. The chart carried by the drum and the markings on the roller are based on empirical relations and enable the optimum working-speed of, say, a turning operation to be determined in accordance with a selected working life of the cutting-tool, the materials of the work-piece and the tool, the dimensions of the work-piece, and the depth of cut to be made.
Patent GB-1035404-A (GB)
Title: Improvements in and relating to swivel couplings
IPC: H01R35/04
Filed: 1964-06-12
Abstract: 1,035,404. Pipe couplings. ARCAIR CO. June 12, 1964 [June 12, 1963], No. 24400/64. Heading F2G. [Also in Division H2] A swivel coupling for a combined fluid and electric cable comprises an electrically conductive terminal member 20 with a fluid passage 42 passing through it and being secured at one end to the end 18 of an electric cable core 14 as by brazing means 24 rotatably connecting the terminal member 20 to a surrounding fluid conduit 16 in fluid-tight relation. The 0-rings 32 provide the fluid-tight seal between means 24 and the terminal member 20. The amount of rotation is limited by pin 60. The other end of the combined cable can have an identical member or alternatively can be as terminal member 54 which is provided with tabs 56 for securing electrical conductors. Threads at 48 are provided for connecting the terminal member to associated apparatus, such as a cutting torch 12 (Fig. 1, not shown). Another arrangement for use with smaller conduits, and electric cables is described (Fig. 4, not shown).
Patent GB-933389-A (GB)
Title: Improvements relating to mechanical seals
Inventor: LYMER ARTHUR
IPC: F16J15/38
Filed: 1961-07-06
Abstract: 933,389. Stuffing-box substitutes. FLEXIBOX Ltd. May 31, 1962 [July 6, 1961], No. 24440/61. Class 122 (5). In a mechanical seal the seal rings c, d are urged axially into contact with each other by helical coil springs k housed in circumferentially-spaced holes j in a ring i press-fitted in a recess in a member a secured to one, c, of the rings. The springs are compressed between the member a and its fixed housing m. The member a is slidably sealed in the housing m by a packing ring n and held against rotation by a tongue q in the housing engaging an axial slot in the ring i and in the member. A split ring m<SP>1</SP> holds the member captive in the housing m during normal operation. The ring d is driven from the rotary shaft b by one or more pins e engaging slots in the ring and extending from a part f secured to the shaft. In a modification, Fig. 4 (not shown), the ring containing the springs is press-fitted in a recess in a member secured to the rotatable seal ring.
Patent GB-726760-A (GB)
Title: Tractor-trailer fluid pressure brake system
IPC: B60T15/18
Filed: 1953-09-04
Abstract: 726,760. Fluid pressure brakes. BENDIX AVIATION CORPORATION. Sept. 4, 1953 [Sept. 16, 1952], No. 24559/53. Class 103 (1). A vacuum servo-operated fluid pressure brake system for tractor-trailer vehicle combinations comprises a regulator valve such that the trailer brakes in addition to being applied in advance of the tractor brakes, may also be applied at a selected pressure appropriate to the loading or road surface conditions. As shown in Fig. 3, the regulator valve 40, which is similar to that described in Specification 678,474 includes a solenoid operated valve 53 which when de-energized allows communication between connection 38 to the engine intake manifolds and connection 19 linked by conduits 44 and 46 to a relay valve 36 governing the trailer brake pressure. When this solenoid is energized it opens valve member 19 and closes opening 23 thus connecting conduit 44 to a chamber 31 by opening 15, the pressure in the chamber 31 then governing also the trailer brake application pressure. The pressure in chamber 31 is regulated by a self lapping valve member 49 which controls communication with the atmosphere through tube 43 and filter 27 or with the vacuum source through tube 83, the action being governed by the compression of a spring 79. To provide different equilibrium pressures in the chamber 31, a handle 25 may be moved anti-clockwise thus carrying with it, by abutment with a flange 95, a ring 87. The handle 25 is integral with a member 75 having two cam slopes 77 engaged by the ends of a follower pin 63 which by pressing down tube 43 adjusts the compression of spring 79 so as to give the required pressure in chamber 31. The ring 87 which is moved by any counterclockwise movement of handle 25 has a tongue 15 which normally projects between an earthed spring pressed contact 113 carried by the ring 75 and a conductor strip 121 connected to the solenoid 55. The solenoid 55<SP>1</SP> may thus be energized at any time after the handle 25 and ring 87 have been rotated counter clockwise to set a pressure in the chamber 31, by a clockwise movement of the handle 28 back to its initial position so that the tongue 15 no longer prevents contact between the contact 113 and strip 121. Referring to Fig. 1, an initial advance braking of the trailer may thus be carried out at a brake pressure corresponding to the pressure set in chamber 31, either by a land operation as described above, or by initial movement of a brake pedal 60 and master cylinder 54 to close a further switch for engaging the solenoid 55<SP>1</SP>. At a later stage hydraulic pressure from the master cylinder 54, acting through the conduit 56 upon the governor valve 58 of a pneumatic servo device 30 for the tractor brakes provides a pressure in pipe 59 which operates a shuttle valve 42 to shut off the effect of the control valve 40 upon the trailer brakes, the brakes of both tractor and trailer then being applied in correspondence with the master cylinder pressure. This system constitutes an improvement on that described in Specification 629,225.
Patent GB-755482-A (GB)
Title: A method for the manufacture of brushware having a metal holder, in which the fibre tufts consist of thermoplastic, material, and brushware manufactured by said method
IPC: A46B3/00
Filed: 1954-08-24
Abstract: 755,482. Fixing bristles in brushes. ZEILSTRA, J. R. Aug. 24, 1954, No. 24655/54. Class 19 A brush has a metal back formed with apertures therein having their edges turned in through at least 90 degrees and thermoplastic bristle tufts held in the apertures by fusing the root ends of the bristles together and forming a head which engages the edges of the apertures. The bristles may be of polyvinyl chloride, a polyamide or cellulose acetate or butyrate. Specification 106,590 [Class 19] is referred to.
Patent GB-1235062-A (GB)
Title: Preparation of alkene polymers and activated catalyst compositions therefor
IPC: C08F10/00
Filed: 1969-05-14
Abstract: 1,235,062. Polymerization of alkenes. STAMICARBON N.V. 14 May, 1969 [15 May, 1968], No. 24662/69. Heading C3P. Solutions of alkene polymers are prepared by polymerization of one or more alkenes at above 110‹ C. in a liquid dispersing agent using a catalyst obtained by mixing an Al-halogen compound, a Ti compound and an organo-Mg compound, and incorporating an activator into the catalyst during and/or after the preparation and/or mixing of the catalyst components, the activator being an alkanol, alkenol, alkanolate, alkenolate, carboxylic acid or salt or ester thereof, ketone or aldehyde. In the examples ethylene or propylene is polymerized using AlEt 2 Cl, AlEt 1À5 Cl 1À5  or AlCl 3  as Al-halogen component; Ph 2 Mg, C 4 H 9 (C 10 H 21 O)Mg, (C 4 H 9 ) 2 Mg, C 4 H 9 - (C 3 H 7 O)Mg, C 4 H 9 MgCl and 2(C 4 H 9 O) 2 .O(C 4 H 9 ) 2 - Mg as organo-Mg component; TiCl 4 , TiCl 3  Ti(OC 4 H 9 ) 4  or TiCl 3 /VOCl 3  as Ti component; decanol, cyclohexanone, benzoic acid, butylacrylate, benzaldehyde, Al(OEt) 3 , and Mgstearate as activator and pentamethylheptane and hexane as diluent.
Patent GB-1457694-A (GB)
Title: Tobacco-smoke filters
IPC: A24D3/10
Filed: 1974-06-04
Abstract: 1457694 Cigarette filter BRITISH-AMERICAN TOBACCO CO Ltd 29 April 1975 [4 June 1974] 24704/74 Heading A2C A cigarette filter comprises cellulose-acetate tow treated with a succinic acid ester of formula where R 1  and R 2  may be methyl, ethyl, N- propyl and/or n-butyl. The ester is added in an amount between 1 and 10% by weight of the tow.
Patent GB-318384-A (GB)
Title: Direction indicator for road vehicles
IPC: B60Q1/34
Filed: 1928-08-29
Abstract: 318,384. Waddington, J. Aug. 29, 1928. Road-traffic signals on vehicles.-Directionsignalling apparatus for use on road-vehicles comprises an arrow-shaped arm 1 mounted so as to be moveable in both horizontal and vertical planes. The arm is pivoted on a pin 2 carried by plates 3 secured to a plate 5 which is rotatable in a recessed plate 6 secured to the roof 10 of the vehicle. A hand lever 15 rotates the arm 1 through a toothed quadrant 12 and a gear 11, and when the arm is turned into the desired vertical plane, the lever 15 engages a notch and holds the arm fixed. The arm may be fitted with reflectors or with a lamp 60 and a glass cap 65.