baber/WOPTO huggingface dataset:
Patent GB-594241-A (GB)
Title: Improved means for straightening and/or tensioning leaf springs of the type used for telephone contact assemblies, as employed on telephone and like equipment, particularly on relays, cam operated switch gear, key switches and the like
IPC: H01H49/00
Filed: 1945-03-22
Abstract: 594,241. Straightening electric contact springs. INSTANTA ELECTRIC, Ltd., and BROWN, W. S. F. March 22, 1945, Nos. 7312 and 14032. [Classes 83 (ii) and 83 (iv)] Apparatus for setting contact springs of switches comprises a holder 11 for a spring assembly 10 movable about a shaft 12 and axially positioned by a detent 23 engaging notches 22 to align successively springs 20 with tools 14, 15 on a tool carrier 13. The tools 14 are rotatable by levers 17. The spring is swung about the shaft 12 and engaged with a slot in the tool 14 and the desired set is applied by operation of the lever 17. The rod 12 of the tool carrier 13 is movable lengthwise of the spring to move the spring through inclined or wavy slots 16 in the tools 15. In a modification the tools are carried on a turret and the spring carrier is moved lengthwise of a spring by operation of a pedal.
Patent GB-1390502-A (GB)
Title: High speed gas driven turbines
IPC: A61C1/05
Filed: 1971-03-19
Abstract: 1390502 Turbines MICRO TURBINES Ltd 20 March 1972 [19 March 1971] 7325/71 Addition to 1018300 Heading F1T The high speed gas-driven dental turbine described in Specification 1018300 is modified by the provision of a cylindrical shell 7 surrounding and compressing the resilient bearing support rings 8. The complete assembly contained within shell 7 can thus be readily inserted into, or removed from, a dental handpiece without upsetting the compression of rings 8. Shell 7 is provided with ports 12, 13 for the supply of gas to rotor 2 and bearings 3, 4. The latter are retained axially by circlips 9 or, in a modification, Fig. 2 (not shown) by a circlip 9 and a radial inward projection (14) from the end of shell 7.
Patent GB-590410-A (GB)
Title: Improvements in or relating to knitting machines
IPC: D04B9/18
Filed: 1944-04-20
Abstract: 590,410. Knitting. HEMPHILL CO. April 20, 1944, No. 7326. Convention date, April 21, 1943. [Class 74 (ii)] In knitting the heel or toe of a stocking by reciprocatory knitting upon a circular machine, the separation of a pile yarn 8 and a body yarn 6 is increased by feeding the body yarn 6 below the pile yarn 8, engaging the body yarn only by the first active needle 69, and drawing the needle downwardly before the next following needle 73 engages both yarns. Means are provided for projecting the sinkers 71 inwardly before they are engaged by the pile yarn and after the body yarn has been drawn down so that the sinker ribs 72 engage between the two yarns, the body yarn being received in the throat of each succeeding sinker, and the pile yarn upon the top of the nib. The yarn guide 7 for the body yarn 6 in its operative position rests in a depression in the usual mouthpiece in the carrier ring 1, and the guide 9 for the pile yarn has a flexible end portion arranged to be movable laterally towards either corner of the mouthpiece, dependent upon the direction of reciprocation. The guide 9 may be bent permanently so that in normal rotary knitting it assumes a position in one corner, and is moved by a lug 21 upon the sinker cam cap 2 into the opposite corner when the needle cylinder rotates in the opposite direction. The leading active needle 69 is picked down so as to engage the body yarn 6 and to separate more widely the two yarns by mechanism comprising a picker 60 arranged between the forward and backward stitch cams 62, 63. A guard cam 61 directs the needle 69 to the picker, which lowers the needle almost to the bottom of the operative stitch cam, e.g., 63, Fig. 18. The instep needles and the inactive heel or toe needles 68 pass above the cam 61 in the normal inoperative path. Knitted fabrics. A heel and toe are knitted in which there is a pile sinker loop to each knitted loop. As shown in Fig. 19, the end sinker pile loop extends from the loop knitted by the end inactive needle 68 to the loop knitted by the second active needle 73. Specifications 590,453 and 590,454 are referred to.
Patent GB-549116-A (GB)
Title: Improvements in and relating to electric measuring instruments
IPC: G01R11/60
Filed: 1941-06-10
Abstract: 549,116. Indicating maximum readings. EVERETT, EDGCUMBE & CO., Ltd., and COLEMAN, C. June 10, 1941, No. 7339. [Class 37] In an instrument having an auxiliary pointer to indicate the maximum reading, frictional drag is minimized and hyssteretic damping is superposed upon it. Fig. 1 shows the application to a permanent magnet moving coil instrument. In the neighbourhood of one of the permanent magnets (not shown) is a piece of magnetic material 2 the face of which forms the segment of a circle concentric with the axis of the movement. Mounted on the axle is a short arm 3 of non-magnetic material to the end of which is freely pivoted a pawl 4 of magnetic material, the outer end of which rests against the cylindrical face of the segment 2 and is held in contact therewith by magnetic attraction due to the stray field from the permanent magnet. Mechanical pressure may be applied in addition, e.g. by a light spring. The magnetic flux may be supplied by a separate permanent or electromagnet, or the segment itself may be of hard steel and permanently magnetized. In place of the pawl 4 a disc or wheel 5, of magnetic material, Fig. 2, may be lightly pivoted on the end of the arm 3. In a modification, Fig. 3, a soft iron disc 6 is mounted on the axle of the pointer 1. An arcuate guide 7 is fixed concentric with the pointer axis, and an adjustable pivoted soft iron pawl 8 is secured to this guide so that it engages the periphery of the disc 6. The braking effect may be adjusted by altering the position of the pawl in the guide. Where there is no permanent magnet field, as in the case of an A.C. instrument, the pawl 8 may be of permanently magnetized hard steel. In this case the pawl may be pivoted about an axis at right angles to that shown and may press on the surface of the disc 6 instead of on the rim, adjustment being made by altering its distance from the axis. The braking magnetic circuit may be magnetically shielded or may be constructed so as to make it astatic.
Patent GB-1108070-A (GB)
Title: Improvements in or relating to receivers with automatic gain control means
IPC: H03G3/30
Filed: 1967-02-15
Abstract: 1,108,070. Automatic gain control. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. 15 Feb., 1967 [18 Feb., 1966], No. 7343/67. Heading H3T. In a receiver provided with automatic gain control, an attenuator is also provided in the signal input channel, together with means dependent upon the input signal level to bring it into operation when the input voltage exceeds a predetermined value, and thereafter to switch it out of circuit if subsequently the input voltage falls below a second predetermined level. Inserted in the lead from aerial 3 to R.F. amplifier 4 is an attenuator in the form of series resistor 19 which can be short-circuited for A.C. by means of diode 20, blocking capacitors 21 together with R.F. chokes provide for feeding a switching voltage to the diode. This switching voltage is derived from the collector circuits of transistors 22, 23, which are cross-coupled to form a bi-stable circuit. At low signal levels transistor 22 is conductive, and transistor 23 non-conductive, so that diode 20 is biased conductive and the attenuation a minimum. The base of transistor 22 is coupled by means of a Zener diode 11 to the A.G.C. generator 10 which produces a positive voltage decreasing as the signal input increases, and at a high signal level, beyond which overloading of the receiver would occur, the potential across Zener diode 11, falls below the contact potential and it becomes conductive. Transistor 22 is then biased non-conductive and transistor 23 becomes conductive, so that diode 20 is biased non-conductive and attenuation occurs. Zener diode 11 is then biased to be non-conductive and it is not until the signal input level falls sufficiently for the A.G.C. voltage to rise enough for the voltage across the Zener diode 11 to exceed the Zener voltage that this diode again becomes conductive. It then applies a positive voltage to the base of transistor 22 which causes the bi-stable circuit to reverse and again make diode 20 conductive, removing the attenuation.
Patent GB-939353-A (GB)
Title: Improvements in or relating to valve actuators
Inventor: FRY JEREMY JOSEPH
IPC: F16K31/05
Filed: 1961-02-28
Abstract: 939,353. Valves. ROTORK ENGINEERING CO. Ltd. Feb. 28, 1962 [Feb. 28, 1961], No. 7344/61. Class 135. A valve actuator has an operating shaft 12 carrying nut 14 engaging screwed valve spindle 20 and a driving member 21 normally engaging an electric motor worm 24 via a worm-wheel 22 loaded upwards by spring 29 so that peg 21 engages slot 23. A manual operating means 38, 40 is movable on the shaft against spring 52 and has a skirt portion 42 which pushes wheel 22 out of engagement with peg 21, the latter then engaging a skirt slot 43. An annular groove 48 engages a peg 47 in a lever 45 hinged at 46 and swings it against spring 49 until the flat end of the lever abuts the wheel 22 whereby the manual means is held in engagement with peg 21. On operation of the motor, the lever 45 is disengaged and wheel 22 re-engages peg 21. Limit switches and a valve position indicator are worked via worm 32 and wheel 33. Specification 842,581 is referred to.
Patent GB-1460469-A (GB)
Title: Belt drives for machines which produce little or no inherent heat
IPC: F16D43/21
Filed: 1974-02-18
Abstract: 1460469 Friction Clutches VORWERK & CO INTERHOLDING GmbH 18 Feb 1974 [14 March 1973] 7363/74 Heading F2C A temperature responsive overload release friction clutch for a domestic floor-treating machine comprises a driving pulley 1 rotatably fast with a ring 9 on which are secured bimetallic spring strips 10 carrying friction segments 8 which are normally urged by spring action into engagement with a drum 2 fast with a stub shaft 14 of a tool 3 of the machine. On overload the clutch slips and the heat produced causes the bi-metallic spring strips 10 to disengage the segments 8 from the drum 2. The pulley 1 is driven from a driving unit 4 by a toothed belt 15.
Patent GB-898136-A (GB)
Title: Automatic radio transmitters
Inventor: KIRYLUK WLODZIMIERZ
IPC: G01S1/68
Filed: 1959-03-03
Abstract: 898,136. Radio signalling; keying carrier frequencies; transistor modulating circuits. BURNDEPT Ltd. March 3, 1960 [March 3, 1959], No. 7365/59. Class 40(5). A radio beacon apparatus radiates an interrupted modulated R.F. signal, generated by an oscillator 1, applied to a class C.P.A. stage 3 which is grid modulated by an audio frequency, squegging, transistor oscillator stage 7. When the transistor is oscillating it presents a small resistance in the grid circuit of amplifier 3. As the charge on capacitor 14 rises transistor 7 is cut off and the resistance presented in the grid circuit is then high; modulation ceasing and the carrier amplitude diminishing. The depth of modulation is determined by capacitor 19.
Patent GB-616984-A (GB)
Title: Improvements in or relating to circuit arrangements for reinserting the d.c. or slowly-varying components into electrical signals
IPC: H04N5/16
Filed: 1946-03-09
Abstract: 616,984. Television. WHITE, E. L. C. March 9, 1946, No. 7396. [Class 40 (iii)] A circuit for restoring D.C. and slowly-varying components of electric signals having recurrent datum portions (e.g. television signals) comprises a series capacity, a shunt discharge path for said capacity, a uni-directionally conducting device for applying a charge to said capacity during any one of said recurrent datum portions and a source of voltage in series with said shunt path and of such a magnitude that the restoration action of the circuit is rendered substantially independent of the amplitude of said signals between said datum portions. The Specification describes as known a restoration circuit, Fig. 1, not shown), in which the charge developed across a condenser during the occurrence of picture signals and which leaks away through a resistor during the same period is restored by a diode which is caused to conduct only during the intervals between picture signals, i.e. during synchronizing periods. This circuit is said to suffer from the defect that the re-insertion level is dependent upon the intensity of the picture signals since the charge which the diode has to restore is dependent on this latter intensity. This difficulty is overcome or reduced by the circuit arrangement of Fig. 2 in which the diode 13, which applies a charge to the series capacity 11 during synchronizing periods, is so biassed by battery 15 through the shunt leakage resistor 12 that it operates at a point on its characteristic of greater differential conductivity. Specification 515,364 is referred to.
Patent GB-177972-A (GB)
Title: Auxiliary air admission devices for internal combustion engines
IPC: F02D9/00
Filed: 1921-03-08
Abstract: 177,972. Stockman, W. B., East, E. K., and Morton, B. S. March 8, 1921. Cylinders, pipes for.--A device for diluting the charge comprises a tubular valve 20, the plunger of which may be selectively locked by a device (not illustrated) on the dashboard to admit either hot or cold air to the induction pipe, or to stop admission altogether. The hot air is drawn from a muff 14 on the exhaust manifold and may be cooled by admixture of air from the sleevecontrolled by-pass 18. The air passes to the induction pipe through a distributor 46, com- 'prising an annular chamber 48, Fig. 7, in communication on the one hand with the air supply 33, and on the other with the induction pipe through perforations in the ring 49, which may carry gauze screens.
Patent GB-350523-A (GB)
Title: An improved gaiter or legging
IPC: A41D17/00
Filed: 1930-03-07
Abstract: 350,523. Leggings. BLACK, D., 20, Briar Road, Newlands, Glasgow. March 7, 1930, Nos. 7470 and 16126. [Class 141.] Leggings are made of non-inflammable transparent celluloid. As shown, a legging A, Fig. 1, is made of a single piece with a gaiter or bottom attachment C to overlap the top of the wearer's heel. A templet D, Fig. 4, is used to cut the sheet of celluloid, which is then heated and brought to the desired shape. While under heat, the edges of cuts corresponding to the cuts H in the templet are fused together with the aid of cellulose acetate in acetone. Springs B form an integral part of the legging. The gaiter part C may be fixed by cellulose acetate in acetone or by rivets or eyelets. The spring is attached to the legging by a small rivet at each side. The spring is covered. According to the first Provisional Specification the legging, which may have a tongue portion, may be closed at the front by elastic or other lace, buttons, clasps, or other fastening means. The gaiter portion may fit inside the shoe. A kneecovering part and side bottom flaps may be attached and also a transparent garter may be used. Various examples of suitable transparent material are enumerated in the Specification. According to the second Provisional Specification elastic loops may be used for fastening, and an arcuate flap provided for the instep and hinged to the tongue by a rubber strip. The tongue and instep flap may be dispensed with. Reference has been directed by the Comptroller to Specifications 2134/85, [CLass 17, Boots &c.], 11927/98, and 2425/13, [both in Class 141, Wearing apparel].
Patent GB-715849-A (GB)
Title: Method of electroplating and electroplating compositions
IPC: C25D3/58
Filed: 1952-03-24
Abstract: A brightening agent for electroplating baths (see also Group XXXVI), consists of the reaction product of an oxy-aldehyde as defined below and an amine containing primary or secondary amino groups, a hydroxy, carboxy or sulphonic radical being present as a water-solubilizing agent.  The oxy-aldehydes employed are of the general formula <FORM:0715849/IV (b)/1> in which R represents an organic radical, residue or nucleus, preferably having a cyclic or ring structure and containing in said ring structure or as part of a side chain the grouping <FORM:0715849/IV (b)/2> Examples of reactions described are (i) furfural with anthranilic acid, (ii) piperonyl aldehyde with anthranilic acid, (iii) anisic aldehyde with 2-methyl 2-amino 1-propanol, (iv) furfural with 2-methyl 2-amino 1-propanol, (v) anisic aldehyde with a mixture of tertiary, secondary and primary iso-propanol amines, (vi) piperonyl aldehyde with 2-methyl 2-amino 1-propanol.
Patent GB-1501871-A (GB)
Title: Pile fabrics
IPC: D04H11/08
Filed: 1974-02-20
Abstract: 1501871 Pile fabrics: shrinking fabrics DUNLOP Ltd 11 Feb 1975 [20 Feb 1974 6 Dec 1974] 7660/74 and 52984]74 Headings D1K and D1S [Also in Division B5] A pile fabric is made by superimposing webs (i) and (ii) of non-woven staple fibres, web (i) including crimped fibres and web (ii) comprising a major pronortion by weight of shrinkable fibres, needle-punching (i) through (ii) using forked needles to form the pile, and shrinking the shrinkable fibres to reduce the area of the fabric. Web (i) may comprise at least 50wt.% crimped fibres and may comprise polyethylene terephthalate, polyamide, polypropylene, acrylic or rayon fibres or mixtures thereof. Web (ii) may have a weight/unit area less than 25%, e.g. 6-8%, that of web (i) and may comprise wool, polyethylene terephthalate polypropylene, polyamide or rayon shrinkable fibres; a majority of these fibres may be straight, but up to 20wt.% crimped fibres may be included. Either of the webs may be preneedled with barbed needles to improve their cohesion or treated to reduce fibre-metal friction and increase fibre-fibre friction, and they may be pre-bonded by adhesive or by light needling with barbed needles. The pile may be formed by needling with forked needles which may lie parallel or perpendicular to the fibre direction, thus producing a uniform pile or discrete fibre tufts, respectively. The fibres in web (ii) may be shrunk by heat and/or moisture or by "slack mercerisation" with aqueous NaOH. Heat - treatment may be carried out on a drum. The pile fabric may be backed with SBR latex foam, natural latex foam, polyurethane foam, EPDM rubber, PVC or non-woven material, e.g. during heat-shrinking. The specification gives preferred fibre densities and lengths, web weights, needle-punching densities and fibre blends.
Patent GB-219053-A (GB)
Title: Improvements in and relating to the generation of waves for wireless telegraphy and telephony by thermionic valves
IPC: H04L27/04
Filed: 1923-03-17
Abstract: 219,053. Seymour, C., Airey, H. Morris-, Shearing, G., and Matthews, C. March 17, 1923. Thermionic generators.-Relates to a modification of the invention described in Specification 176,491, in which a polyphase supply is used for providing the anode voltage of a generator of continuous or intermittent continuous oscillations, and consists in various circuit arrangements wherein the anode voltage is provided from an alternating or rectified A.C. source. The A.C. generator A, Fig. 1, supplies the anodes E, F, through a transformer of which the secondary is earthed at its middle point, so that the voltages E, F, are 180‹ apart in phase. Fizses D are provided. The grids and filaments are connected to the aerial inductance T at fixed points M, L, respectively, while the aerial and earth connections are made at adjustable points P, Q, tuning being effected by varying the positions of P and Q. The filament current may be drawn from a separate source S or from a transformer whose primary is supplied by the alternator A, and a single valve may be employed if desired. The tappings M, L, may be made from an auxiliary coil of high inductance which is. bridged across some of the turns of the coil T. In the modification shown in Fig. 3, pairs of tappings P, Q, from the aerial coil T are connected to corresponding pairs of switches a and b, c and d, &c., and tuning can be effected by the single operation of closing one of these pairs. The filament and grid connections are made at fixed points L, M. The filaments of the triode valve E and diode valve U are heated by the alternator A through the transformer K, g, h, on the closure of the double switch Z which is effected electromagnetically by closure of the switch k. Voltage is supplied to the anodes of the valves E, U, on closure of the triple switch Y which is effected by closure of the switch A<1>, the earth connection being simultaneously made for the points b, d, f, &c. The switch Y brings into action the transformer B, at the same time shortcircuiting a portion X of the rheostat W, to compensate for the reduction of filament current which would otherwise occur. A condenser D<1> of small capacity is connected as shown to give intermittent C.W. radiation, rectified impulses of current being supplied to the anode of the valve E through an ammeter shunted by a condenser. For C.W. working, the impulses are smoothed out by a smoothing condenser C' which can be shunted on the condenser D<1> by closing the switch x.
Patent GB-1385185-A (GB)
Title: Electrical display devices
IPC: G09G3/30
Filed: 1971-03-24
Abstract: 1385185 Matrix displays MULLARD Ltd 25 Feb 1972 [24 March 1971] 7754/71 Headings G5C and G4H An addressing circuit for a display device 1 including an array of light emitting elements at the intersections of crossed conductor arrays in which rows are energized for a row period in a predetermined sequence and during each period selected columns are energized; the circuit comprises a circulation memory 11 with a series output storing character data for n rows of characters; a character generator 9 which produces coded signals corresponding to the data to be displayed and a row store 9: the cycle period of the memory differing from the row period such that data for each line of characters is supplied in every nth row period. With this arrangement data for the first row is supplied during the first fill period, for the second row during the second fill period et seq and gating is avoided. The display panel 1 may comprise gas discharge cells or electroluminescent diodes. The row conductors are addressed by a submatrix 2 of driver transistors; the scanning sequence being determined by the connections to line and row decoders 5, 6, The column conductors are controlled by a row store comprising a matrix of bi-stable switches addressed by the character generator 9 and a decoder 6. The display panel can comprise an array of electroluminescent diodes.