baber/WOPTO huggingface dataset:
Patent GB-643371-A (GB)
Title: Improvements in and relating to keying control systems for oscillators
IPC: H05B6/04
Filed: 1947-11-18
Abstract: 643,371. Switching systems for high-frequency oscillations. BRITISH THOMSONHOUSTON CO., Ltd. Nov. 18, 1947, No. 30539. Convention date, Nov. 20, 1946. [Class 38 (iv)] [Also in Group XL (c)] High-power valve oscillators are switched off by control currents passed through a grid bias resistor, and to avoid sustained power losses in the bias resistor during non-oscillatory periods, self-oscillation is terminated by supplying to the grid a negative pulse voltage which decays at the same rate as the oscillations and is subsequently held at a low negative voltage sufficient to prevent oscillation from re-starting. The valve oscillator 1, Fig. 1, employs a bank of lamps 10 as grid bias resistor which during oscillation bias the grid to a level Ec, Fig. 5. To terminate the oscillations, a switch 39 is closed and relay 40 lifts contact members from contact 40c to 40a, and from 40d to 40b. Negative voltage from a potential divider 28 and mains rectifier 22 is normally supplied to the grid of a thyratron 21, and when contact 40a is closed this negative voltage is removed by earthing the grid through a condenser 42, and the thyratron fires. By this means the condenser 16, which is held charged by a mains rectifier 15, is discharged through the thyratron 21 and the bias resistor 10, giving a prohibitive bias Es, Fig. 5, to the grid: As the condenser discharges, this bias decays along the curve 43 at the same rate as the oscillation is damped. When the bias reaches the value Ech, further fall is prevented by means of three gas-filled valves 32 ...34, which have their anodes energized by a three-phase supply 35, and are connected across the bias resistor 10. Their grids are connected in parallel to earth through a resistor 38. During self-oscillation of the valve 1, and during the application of the terminating pulse, the bias on the oscillator grid is sufficient to prevent the anodes of the valves 32... 34 from being made positive by the three-phase supply. When, however, the pulse has decayed to the value Ech, any further reduction of bias causes current to pass through one or more of the valves 32... 34 and restores the bias to the value Ech. In this way, current consumption in the bias resistor 10 is kept at a low value during the periods of non-oscillation. During these periods, the condenser 44 is charged negatively from the potentiometer 28 through the contacts 40b, and when the switch 39 is released t 4  re-start the oscillations, this negative charge is applied through the contacts 40d to the grids of the valves 32...34, blocking these valves and allowing the grid bias on the oscillator valve 1 to resume the normal operating level Ec. At the same time, the thyratron 21 is blocked by negative voltage derived through the contact 40a from the potentiometer 28.
Patent GB-1003986-A (GB)
Title: Vacuum cleaner
IPC: A47L5/36
Filed: 1962-08-09
Abstract: 1,003,986. Exhaust-silencer. SUNBEAM CORPORATION. Aug. 9, 1962 [Jan. 2, 1962], No. 30549/62. Heading F1B. [Also in Divisions A4 and F2] The exhaust from the motor-driven fan unit 20 of a suction cleaner is muffled by an annular strip of foam plastics material 36, e.g. polyurethane, surrounding a diffuser unit 35.
Patent GB-805180-A (GB)
Title: Clipper construction
Inventor: WAHL LEO JACOB
IPC: B26B19/20
Filed: 1956-10-08
Abstract: 805,180. Hair clippers. WAHL CLIPPER CORPORATION. Oct. 8, 1956, No. 30567/56. Class 131 A hair clipper includes a device for tensioning the lever 27, which adjusts the fixed blade longitudinally of the movable blade to vary the length of hair left uncut, and comprises a fixed blade 15 carried by the web 16 of a U-shaped bracket 17 having limbs 25 with flanges 23 sliding in grooves 21 in the clipper casing 10 One limb 25 has a pin 40, riding in a slot 41 in the lever to impart sliding movement to the bracket, and an opening 26 aligned with an opening 28 in thelever 27. A sleeve 30 extends through the openings to bear on the casing 10 and to project beyond the face 31 of the lever which has spaced shoulders 33 supporting a stack of thin, flat resilient washers 35. A headed screw 37, securing the lever to the casing, bears on the outer end of the sleeve and on the washers to distort them, the resilience of the washers tensioning the lever against the bracket to avoid accidental alteration of the adjustment of the blades.
Patent GB-944735-A (GB)
Title: Improvements in or relating to temperature sensitive and/or measuring devices
Inventor: VARTY KENNETH ARMSTRONG
IPC: G01K7/24
Filed: 1961-08-24
Abstract: 944,735. Transistor oscillators. C. A. PARSONS & CO. Ltd. July 20, 1962 [Aug. 24, 1961], No. 30596/61. Heading H3T. [Also in Division G1] A variable frequency oscillator 2 (Fig. 1) comprises a transistor T having a tuned circuit L 1 , C 1  between the base and emitter, and a biasing resistor R 1  between the base and collector to provide stabilising negative feedback. The D.C. supply may be obtained from another oscillator 7 (Fig. 2) feeding through a static tuned circuit 6 to a tuned circuit 9, and rectifier and smoothing components mounted with oscillator 2 for rotation. The frequency of oscillator 2 is varied by a thermistor 1 connected across part of tuning coil L 1 .
Patent GB-362593-A (GB)
Title: Improvements in and apparatus for the manufacture and production of ethers
IPC: C07C43/04
Filed: 1930-10-13
Abstract: <PICT:0362593/IV/1> Ethers are obtained by heating alkyl sulphuric acids with water, if desired, while adding steam or a mixture of steam and ammonia, distilling off the ether formed, and continuously subjecting the residual mixture comprising alkyl sulphuric acid, sulphuric acid, alcohol, and water to fractional distillation, partially freeing the resulting vapours from water in a separate column, and bringing the resulting vapour mixture of concentrated aqueous alcohol into contact with fresh alkyl sulphuric acid at a temperature above 100 DEG  C.  For example, already partially saponified alkyl sulphuric acid such as ethyl sulphuric acid may be introduced through a pipe F into a packed tower A, in which it is completely saponified by steam blown in through a pipe G.  The resulting dilute acid mixture flows out at H.  The alcohol, steam, and possibly ether produced by the saponification distil off through a pipe J and enter a column B, which is maintained at such a temperature, for example 80 to 92 DEG  C., that the concentrated alcoholic vapours passing off through a pipe K to a vessel C which is kept at a temperature of over 100 DEG  C. contain the amount of water required for the formation of ether to take place therein. The aqueous condensate flowing from the column B can be returned to the saponification through pipes L, G, or it may be conveyed to the central or upper portion of the tower A.  The vessel C, which may be a packed tower, is supplied from a vessel D with alkyl sulphuric acid preferably diluted with less than 25 per cent of water.  The ether formed distils off through a pipe M, is rectified in a column E, and led off through a pipe N.  The alcoholic condensate from the column E is returned through a pipe O to the vessel C, to the column B, or to the upper portion of the tower A.  The saponification in the tower A may be combined with the simultaneous admission of ammonia and formation of ammonium sulphate.  The dilution of the alkyl sulphuric acid before entering the vessel C may be brought about, if desired, by adding the vapours or a portion thereof resulting from the saponification in the tower A, or by connecting the outlet of the vessel D with the pipe K.  A washing tower fed with milk of lime or a solution of sodium hydroxide or carbonate kept at 60 to 80 DEG  C. may be interposed between the vessel C and the column E.  Alkyl sulphuric acids obtained by absorbing ethylene or other olefines or mixtures thereof in sulphuric acid, and containing, if desired, a high proportion of dialkyl sulphate, may be used as starting materials for the process.
Patent GB-709911-A (GB)
Title: Improvements in or relating to drying machines
Inventor: CLEGG RICHARD ROBINSON
IPC: F26B21/08
Filed: 1950-12-15
Abstract: 709,911. Drying apparatus. TOMLINSONS (ROCHDALE), Ltd. March 13, 1952 [Dec. 15, 1950], No. 30631/50. Class 34(2) Apparatus for enabling the humidity in the chamber 1 of a drying machine to be controlled has a fan 4 for withdrawing continuously a proportion of the drying chamber atmosphere through a small auxiliary chamber 3 containing a cooling coil 5 which cools the atmosphere below 212‹F without condensation and a wet and dry bulb thermometer arrangement 6 from the readings of which the humidity may be determined and controlled as required. The coil 5 is cooled by. water flowing in counter flow to the withdrawn atmosphere.
Patent GB-965078-A (GB)
Title: Improvements in lined cartons
Inventor: WEAVER JAMES FREDERICK
IPC: B65D5/60
Filed: 1959-09-08
Abstract: 965,078. Lined cartons. E. S. & A. ROBINSON Ltd. Sept. 8, 1960 [Sept. 8, 1959], No. 30639/59. Headings B8C and B8P. A cardboard blank has stuck to panels 2, 3 of it a tubular thermoplastic liner bag 22 heat sealed at 25, and is made into a lined container by sticking together panels 1 and 5 of the blank and closing conventional bottomclosure flaps 6, 7, 8, 9, which may be of the tongue-and-slot type. The container may be closed by gripping the top of the liner 22 between the top closure flaps 15, 16 of the outer carton and heat sealing. Alternatively the liner 22 may be heat-sealed first, and then the outer carton closed over it in any conventional way. To facilitate emptying, perforations 18 and 19, or 26 may be made in the container to give a pouring opening, or a hole for a straw respectively.
Patent GB-321312-A (GB)
Title: Mounting of vehicle wheels
IPC: B62K25/06
Filed: 1928-10-23
Abstract: 321,312. Ascot Motor & Manufacturing Co., Ltd., and Pullin, C. G. Oct. 23, 1928. No Patent granted (Sealing fee not paid). Guiding vertical play; springs, arrangement of. - A vehicle wheel is mounted in tubular guides arranged one at each end of the wheel spindle, each guide being attached to a plate adapted to be fixed to the vehicle frame or body. Each of the guides consists of a tube 2, 3 of D or other section attached as for instance by welding to a separated plate 5 adapted to be welded or otherwise secured at each serration to the vehicle frame or body. Slidable vertically in the guides are wheel mountings 8, 9 to which the spindle 4 passing through the wheel is secured. The spindle may be removed and the wheel detached, leaving in position the brake drum 18 which is mounted rotatably on a spindle 12 secured in the mounting 9. Helical springs control vertical movement of the mountings which may be connected to one another by a bridge member 16. Specifications 321,310; and 321,311, [Class 108 (i), Road vehicles, Body details &c. of], are referred to.
Patent GB-637479-A (GB)
Title: An improved roof member
IPC: E04B7/20
Filed: 1947-11-20
Abstract: 637,479. Rick covers. NEALE, G. W. Nov. 20, 1947, No. 30814. [Class 20 (i)] A roofing for ricks comprises a ridge member 10 and a roof 11 built up in sections to any desired length, the roof members engaging each other by interfitting flanges and channels. The edges of the sections of the ridge members 10 are turned under to form channels 12, Fig. 4, which are cut away at one end of each section so that the sections may be engaged in the channels of the adjacent sections. The roof members engage the ridge members by studs 14 and keyhole slots held engaged by a channel section member 18 and a tube 29 passed under the ridge member. Tubes 22 pass through slots in the flanges of the roof members and through gable end members 24. The roof is secured by tie bars 33, 34, 36, 37 and pins 35 hooked to the tie bars and driven into the rick. To allow ventilation the edges of the roof members are held apart by clips. Strips of corrugated iron may be used as roof sections. The roof may be supported on a skeleton structure to form a cover for agricultural implements.
Patent GB-746757-A (GB)
Title: Improvements in apparatus for the automatic transmission of morse-code signals
IPC: H04L15/12
Filed: 1952-12-05
Abstract: 746,757. Telegraph transmitters. LEONARDI, G., and MALVICA, S. B. Dec. 5, 1952 [Dec. 10, 1951], No. 30957/52. Class 40 (3). In apparatus for the automatic transmission of Morse code signals by the opening and closing of a transmitting circuit by the direct actuation of movable contact makers slidable upon code bars with conducting and non- conducting portions, each key lever has a toothed wheel 5 meshing with a toothed rack 6 carrying the contact maker 7 and also a gearwheel 4 engaging the wheel 5 and brought into mesh with a gear 1 constantly rotating on the depression of the lever 2. The operated lever 2 is latched by a lever 3 and after the contact member 7 has traversed the conducting and insulating portions of the bar 8 to effect the transmission of the appropriate current impulses via terminals 17, 18, it engages a rod 9 and its support member 7 is rocked about a pivot 26 so that a tooth on a detent arm 12 drops behind a projection 13 on the rack bar 6. At the same time an arm 10 on the bar 6 engages a pivoted member 11 which is rocked so that its upper end rotates the latch member 3 to release the actuated key lever 2 to return to its normal position in which gear-wheel 4 is disengaged from the gear 1. The rack 6 is moved to the right by a spring 22 and a leafspring 14 engages a rod 15 so that the arm 12 connected to the contact member 7 is returned to its normal position with the tooth resting on the projection 13. The detent lever is held against lateral movement by a spring 23.
Patent GB-1035546-A (GB)
Title: Safety device for pressurized-fluid-operated systems
IPC: B60T11/32
Filed: 1964-08-04
Abstract: 1,035,546. Valves; hydraulic brakes. I. FINK. Aug. 4, 1964 [Oct. 30, 1963; June 29, 1964], No. 30966/64. Headings F2F and F2V. A valve adapted to automatically cut off supply to a faulty conduit in a pressurized fluid-operated system, e.g. a car braking system, comprises (Figs. 1 and 2) a housing 1, a closure member 10 rotatable on a spindle 7, and a fixed sector-shaped member 8 which together define two chambers 9, 9a having inlets 4, 4a from a common source 3 and outlets 6, 6a to separate conduits. In operation, when a leak develops in one of the outlet conduits the closure member rotates under the resulting pressure difference and closes off the outlet to the defective conduit. Spring-pressed balls 12 may be provided to generate friction between the closure member and the housing, and may be so positioned as to snap into the outlets when the closure member rotates. An L- shaped leaf spring 14 engaging in recesses 13 and 15 in the closure member and housing respectively further increases the friction between these two members. To accelerate closure when a leak occurs bores may be provided in the closure member so that, when the closure member is rotated, the supply to the chamber having the defective conduit is diverted to the other chamber. A bleed passage may be provided through member 8 to interconnect the two chambers and allow compensation of slight pressure fluctuations therein. The inlets to the chambers may comprise a series of holes (Figs. 10 and 11, not shown) or co-operating slots 62, 62a and 67, 67a in the housing and closure member respectively (Figs. 12, 13, not shown). To permit air to be removed from the system the closure member may be locked in position by means of a set screw engaging a recess therein. In the alternative embodiment of Fig. 4, a sector-shaped closure member 20 rotatable about a spindle 19 defines two chambers 17, 17a having inlets 24, 24a and outlets 25, 25a, the latter being provided with seats 27 which coact with closure member when it rotates as a result of a leak in one of the outlet conduits connected at 26, 26a.
Patent GB-631083-A (GB)
Title: Improvements in means for mounting devices such as electrical accessories on the rear of panels or plates
IPC: H02B1/044
Filed: 1947-11-22
Abstract: 631,083. Switch cases. CRABTREE & CO., Ltd., J. A., and HILL, W. E. Nov. 22, 1947, No. 31015. [Class 38(v)] A push-button switch is fixed to a plate a by means of metal sleeve f which is a; drive fit in the plate, knurls k enhancing the gripping arrangement. Non-rotation of the sleeve is ensured by an L-shaped bracket i which has a protuberance n entering a depression o formed in the sleeve. The bracket is screwed to' and supports the switch casing e and the sleeve f forms the guide for the push-button b. When a' single switch is fixed to a plate in this manner, two brackets i are associated with the sleeve, but when a pair of switches are mounted in-this manner a bracket i associated with each sleeve supports the adjacent end of a common switch casing.
Patent GB-1070474-A (GB)
Title: Top sharpening cutter link
IPC: B27B33/14
Filed: 1964-08-04
Abstract: 1,070,474. Sawing. OMARK INDUSTRIES Inc. Aug. 4, 1964 [July 22, 1963] No. 31065/64. Heading B5L. A cutter link 16 for a saw chain comprises a plate-like link body 44 having a shank 50 projecting outwardly from the rearward part of he body and an integral top plate 52 which is at the outer extremity of the shank and extends laterally of the body, is inclined forwardly and outwardly from the rear end to the forward end thereof, has an outer surface 58 extending rearwardly and inwardly from the forward face 56 to the rearward face 54 of the plate, and a chisel cutting edge 60 at the intersection of the outer surface and forward face of the plate, the chisel cutting edge being positioned rearwardly of a midpoint 20 of a line joining the axes of the pivots by which the cutter link is joined to other links in the saw chain. Left and right hand cutter links 16 may be incorporated in a saw chain which also has left and right hand kerf sidewall slitter links, side straps 17 and centre drive links 12 having downwardly extending lugs for travelling in a groove in a cutter bar 24 and engagement with a drive sprocket 28. The shank portion 50 of a cutter link is bent outwardly from the link body and the top plate is bent across the medial plane of the link so that it forms an angle of between 100 to 115 degrees to the median plane, as viewed in Fig. 7, and an angle of 40 to 50 degrees with the line 62, Fig. 4, joining the axes of the pivot pins. A portion 64 of the top plate is ground away and the outer surface 58 is ground between the forward and rearward surfaces 56, 54 of the top plate to form the chisel edge 60. The cutter link is also formed with a depth gauge portion 46 having an outer portion on the same radius of curvature as the outer surface 58 but at a greater distance forwardly of the midpoint 70 than the cutting edge 60 is rearwardly of the midpoint. Each sidewall slitter link 14, Fig. 8, has a depth gauge portion 32 and a cutter portion 34 which extends slightly to one side or the other of the median plane of the link and has a leading cutting face 37 and an outer cutting edge 42, the latter being more forwardly disposed relative to the midpoint 70 of its line 62 than the cutting edge 60. The cutter and slitter links may be sharpened on the saw by a grinding wheel 66 having an abrasive surface 68 which engages the links as they pass around the sprocket 28, which has a smaller radius than the nose end of the bar 24. The positions of the cutting edges relative to the midpoints of the links are such that the cutting edges 42 extend outwardly further than the cutting edges 60, the edges 42 slitting the material to be cut and the edges 60 chiselling the material between the slits; because of the inclination of the top plate, the edges 60 are inclined to the direction of movement of the links. The surface of the grinding wheel may be flat or convex to form the cutting edges flat or concave in a direction transverse of the lengths of the links.
Patent GB-1505926-A (GB)
Title: Telephone line circuit
IPC: H04M9/00
Filed: 1975-07-24
Abstract: 1505926 Line circuits WESTERN ELECTRIC CO Inc 24 July 1975 [25 July 1974] 31084/75 Heading H4K A line circuit 20 for a key telephone system is connectible in parallel with a speech pair R, T between a central office and a substation S2, includes a hold bridge L, Rl, V1, and is able to distinguish between the hold and on-hook conditions of S2. The parallel arrangement of the line circuit and speech pair means that the former may be removed (e.g for maintenance purposes) while communication may still take place over the latter. Four possible states of the circuit are described, defined by the condition of relays B and C, Fig. 4 (not shown). Basically, relay B is an off-hook detector while relay C is a ringing current detector. In the idle condition of 52, both relays are released. On receipt of ringing current C is operated. When S2 goes off-hook, B is operated and C releases. If a hold button is depressed during a conversation, resulting in opening of contact HK-1 and removal of earth from the A-wire, relay C also becomes operated and the hold bridge is thereby brought into operation.
Patent GB-646363-A (GB)
Title: Hydraulic duplicating lathe
IPC: B23Q35/18
Filed: 1945-11-19
Abstract: 646,363. Copying-lathes. TURCHAN, M., and WALKER, C. Nov. 19, 1945, No. 31101. Convention date, Sept. 20, 1941. [Class 83 (iii)] [Also in Group XXIII] A copying-lathe or grinding-machine has a reciprocable cross-slide 16 carried by a reciprocable carriage 13, a fluid-operated cylinder 31 supported by the carriage and secured to the cross-slide, a pattern 25 rotatable in unison with the workpiece 24, with their axes lying in parallel spaced relationship, and a tracer 47 pivotally mounted on a housing 38 containing a valve 46 operated by the tracer to control the supply of fluid to the cylinder for governing the cross feed. The work 24 is operated on by a tool 20 in a holder 18 adjustable on the crossslide 16 by a handle 21 and the carriage 13 slides on longitudinal ways on a base 15. Attached to the cross-slide is the cylinder 31, which slides on a stationary piston 32 attached by a rod 33 to a bracket 34 on the carriage 13. The valve 46 is controlled by the tracer arm 47 which has a roller 49 engaging the pattern 25, the latter being rotated from the main work headstock by gearing 27-29, Fig. 3. Under the control of the tracer arm and a spring 46<SP>1</SP>, the valve directs pressure fluid from a flexible conduit 40 leading from a pressure source 37 to one or other side of the piston 32 and returns the exhausted fluid through a flexible conduit 41. An arm 52 on a sliding rod 51 engages the valve to provide manual control and a vacuum conduit 53 withdraws oil seepage from the valve. A shield 25<SP>1</SP> protects the pattern from cuttings. In a modification, Fig. 3, the lathe has two or more carriages 13, 13<SP>1</SP> on which are mounted cross-slides 16, 16<SP>1</SP>, respectively, each cross-slide having its own tracer mechanism. Several slides may also be mounted on a single carriage.
Patent GB-798868-A (GB)
Title: Improvements in or relating to locking devices for automatic adjusting devices for brake rods
IPC: B61H15/00
Filed: 1956-10-12
Abstract: 798,868. Railway brake riggings. ATELIERS DES CHARMILLES SOC. ANON. Oct. 12, 1956 [Oct. 14, 1955], No. 31120/56. Class 103 (1). In order to prevent the lengthening of automatically adjustable rods in railway brake rigging, an adjusting nut 10 on a threaded tension rod 3 has annular projections 11 which, when the brake is released, prevent rotation of the nut by reason of their engagement with projecting rings 17 on a sleeve member 12. When the brake is in the applied condition, as shown in Fig. 3, the sleeve member 12 follows up the movement to the right of the coned casing 8a as a result of the force exerted by spring 13, so that the nut 10 is thus free to rotate and adjustment of the length of the rod may take place in the usual manner.