baber/WOPTO huggingface dataset:
Patent GB-568873-A (GB)
Title: Improvements in hydraulically operated die casting machines of the pressure type
IPC: B22D17/32
Filed: 1943-12-08
Abstract: 568,873. Casting- machines. PETERBOROUGH DIE CASTING & MACHINE CO., Ltd., and STOCK, H. A. Dec. 8,1943, No. 20484. [Class 83 (i)] In a die-casting machine having hydraulic means for closing the die and for forcing in the molten metal, electromechanical means are provided for locking the dies in closed position, these means being rendered operative by limit switches, operated by full closure of the dies, and become operative despite failure of the hydraulic system. The operator initiates a casting cycle by starting a motor-driven pump 21, which draws oil from a tank 22 and forces it into the system 28, 39, &c., and then pressing a switch to energize a solenoid 23, Fig. 2, and move a valve 24 into the position shown in Fig. 1, thus supplying pressure below the valve plunger 34 and moving it up. This causes the pressure oil in pipe 38 to be supplied through a plunger 56, fixed in a cylinder 3, to urge a plunger 4, connecting-rods 8, Figs. 2, 3, and die part 15 to the right, pressure in the pipe 73 being checked by a one-way. valve 101 and a valve 69. The plunger 4 is also connected to a lever 12 pivoted to the frame at 13 so that this is rotated and, as the die 15 presses the spring- mounted die 16 against the nozzle 58, it operates a switch 67 to energize a solenoid 68 and rotate the plug 70 of the valve 69 into the position shown. This admits pressure oil to a cylinder 47 and moves its plunger 75 and a wedge 48 to the right, thus passing below the member 66 of the lever 12 and locking the die in closed position. At the same time the wedge 48 operates a switch 77 to energize a pump-solenoid which moves a valve plug 79 into the position shown, thus admitting pressure oil to a cylinder 84 above its piston 85 which forces a plunger P, Fig. 3, down and molten metal into the die. When the die is full, pressure builds up in the pipe 83 and causes a plunger 88 to operate a switch 90 which de-energizes the pumpsolenoid to reverse the valve plug 79 and return the piston 85. This carries an arm 95, Fig. 3, which, during the return movement, operates switches to reset all the electrical controls ready for a new cycle and de-energizes the solenoids 23, 68, whereby the valves 25, 70 are reversed, Fig. 1A. This also reverses the position of the valve 30 to admit pressure oil to a pipe 46 and the front of the cylinder 47 and withdraw the wedge 48 and, as soon as the plunger 75 uncovers a port 147, pressure is admitted to the front of piston 53 to withdraw die 15, a one-way valve 102 preventing flow from pipe 45 to 100 direct. As the die 15 moves to the left, a bracket 103, Fig. 3, engages an ejector plate 104 thereof to eject the casting, and finally a cam 105 on the die carriage 10 depresses the piston of a byepass valve 107 to short-circuit the pump 20. If, however, the machine is to operate continuously, the cam 105 is made inoperative and another cam on the carriage 10 operates a switch to energize the solenoid 23 and initiate a new cycle.
Patent GB-803290-A (GB)
Title: Improvements in or relating to electro-magnetic devices
IPC: H04Q3/42
Filed: 1955-07-15
Abstract: 803,290. Magnetic amplifiers; bistable state circuits. COMPAGNIE INDUSTRIELLE DES TELEPHONES. July 15, 1955 [July 20, 1954], No. 20616/55. Class 40 (9). The Specification relates to magnetic relays comprising two .auto-self-excited magnetic amplifiers having outputs connected in parallel but with opposite polarity. The Specification describes various ways of connecting the control windings and bias windings to produce desired results. Positive feed-back may also be used to produce bistable circuits. Fig. 1 is a composite circuit illustrating all the embodiments. Two magnetic amplifiers having main windings 1, 1<SP>1</SP> in series with oppositely-poled rectifiers are connected in parallel, to feed a common load 9 via an A.C. eliminating filter 7, 8. Each magnetic amplifier has control windings 3, 31, respectively and may be provided with bias windings 4, 4<SP>1</SP> respectively. Feed-back windings 2, 2<SP>1</SP> may be connected in series with the load 9. Fig. 2 illustrates the characteristic of D.C. Is through a main autoexcited winding such as 1 plotted against ampere-turns NIc in the control winding 3 assuming no bias and no feed-back. By suitably poling the windings 3, 31 the curves for the two amplifiers may be as shown at A and A<SP>1</SP>, Fig. 3, the combined output then being curve B. The curve is seen to undergo a sharp transition from a large negative to a large positive valve for corresponding small changes in control current. If positive feed-back is now introduced, by connecting up windings 2, 21, the curve now becomes that of Fig. 4, in which the arrangement can assume two stable states of large positive or large negative current for zero control current, the arrangement being capable of triggering from one state to the other by positive or negative control currents. In a second embodiment, the poling of winding 31 is reversed and the winding 4, 4<SP>1</SP> are provided with small but different biasing currents. The corresponding curves are then as shown in Fig. 5, and Fig. 6 illustrates the change in output characteristic when positive feed-back is applied. In this case the two stable states are those of zero and a large positive current. It is to be noted, that the arrangement does not assume its state of large positive current until removal of the negative trigger current. Fig. 7 illustrates the care of a magnetic amplifier where the difference in biasing currents is larger.
Patent GB-401062-A (GB)
Title: High speed crank or eccentric press with dividing mechanism
IPC: B21D28/22
Filed: 1932-07-22
Abstract: 401,062. Notching armature discs. SCHULER AKT.-GES., L., Goppingen, Germany. July 22, 1932, No. 20690. Convention date, July 24, 1931. [Classes 83 (ii) and 83 (iv).] In a machine for notching core discs or rings for dynamos &c., an adjustable crank reciprocates a notching tool b cooperating with a tool c and operates a dividing mechanism for the work carrier. The crank l is mounted at the level of the dividing mechanism e, which is operated by a rod g. In cutting external notches the workpiece is mounted on a spindle f, a work holder is mounted on the spindle for positioning rings with internal notches. In order to interrupt the notching a mechanically or hand-operated clutch o is fitted.
Patent GB-192427-A (GB)
Title: Sheet glass drawing mechanism
IPC: C03B17/06
Filed: 1921-08-03
Abstract: 192,427. Marks, E. C. R., (Libbey-Owens Sheet Glass Co.). Aug. 3, 1921. Drawing. - A machine for drawing sheet glass comprises a receptacle from which the molten glass flows in approximately sheet form vertically downwards, a drawing mechanism which grips the sheet on opposite sides and travels downwards, widthmaintaining devices which act on the edge of the sheet, and means for severing the drawn sheet and swing- ing the severed sections into a horizontal plane and delivering them into a lehr. The molten metal from which the sheet is drawn is contained in a forehearth 1, Fig. 1, which is formed with an opening 2 that tapers to a narrow slot. Temperature-regulating devices, consisting of hollow castings 3 through which water is circulated, are arranged on each side of the opening, and the distance between these castings may be adjusted to regulate the, width of the slot. In place of the slot, an opening 8, Fig. 5, may be arranged at the end of the forehearth through which the metal is allowed to flow in a shallow stream 9 over the surface of a hollow watercooled casting 10. The emerging sheet is gripped by rolls 12, Fig. 1, preferably roughened or corrugated, which are geared together and driven in any suitable manner. A pair of these rolls grip the opposite edges of the sheet and overcome any tendency to draw in or narrow. The drawing is continued by grippers, carried by endless chains 18, 18<1>, which grip the sheet at the edges, contact with the sheet being maintained by spring- pressed rollers 76 which bear against the inner runs of the chains. The sheet as it emerges from between the chains is acted upon by a suitable scoring device 21, and then passes between idler rollers 22, 23. Beneath the drawing apparatus is a swinging carrier-frame composed of slots 44 secured to a shaft 42 and provided with ledges 44a for receiving the lower edge of the descending sheet. A counterbalanced lever 24, pivoted at 25, projects into the path of the sheet and is thus depressed as the sheet descends. At a particular point, the lever closes contacts 30, 31 in the circuit of the motor, and the motor thus started drives a cam 41 and rotates the shaft 42. The frame is first moved backwards a little distance to break the sheet along the scored line, and then swings downwards to deposit the severed section on a carriage 49. This carriage is moved forwards along rails 52, 53 by a lever 56, oscillated by the motor, and deposits the section on lehr rollers 61 which feed it into the lehr. In a modification, the carrier 44 is made up of tubes which are secured to the shaft 42. The tubes are provided with openings, each surrounded by a flexible cup, and are connected to a suction pump. The flexible cups make contact with the sheet which is held by suction. The drawing mechanism, comprising the endless chains with the grippers for engaging the edges of the sheet, may be used in a machine of the type in which the sheet is drawn vertically upwards.
Patent GB-1014333-A (GB)
Title: Stone cutting saw
IPC: B28D1/06
Filed: 1962-05-29
Abstract: 1,014,333. Sawing stone. DIAMANT BOART. May 29, 1962 [May 29, 1961], No. 20700/62. Heading B5L. A machine for sawing stone comprises a table 21 for supporting a stone block 1, a frame 4 (not shown) carrying at least one blade and adapted to reciprocate and have a downward feed movement, and means for rocking the table about an axis perpendicular to the desired cut, to which axis is imparted a reciprocating motion co-directional with the feed motion and synchronous with the rocking motion of the table. The saw frame 4 is guided during its reciprocating movement by rollers 5 running on the machine frame 2 and reciprocated by means of a crank 11 and connector rod 10 driven, via a flywheel-cumpulley 13, by a motor 15, the frame being raised or lowered by means of a rotatable threaded shaft 18. The table 21 is pivotally mounted on a carriage 22 by means of a shaft 26 and end bearings 27 slidable in guides 28 on the carriage. The table is provided with rollers 29 which ride on cams 30 rotated by means of a chain-and-sprocket drive 33, 34, 36, 37, this drive being connected to a gearbox 42 driven by means of an electric motor 64, via a speed-reducing gear-box 65. The positioning of the cams 30 is such that as one end of the table rises, the other end lowers correspondingly. The direction of drive cams is reversed by means of electromagnetic clutches 60, 61 coupling, alternatively, different gears within the box 42, the clutches being actuated by means of micro-switches 58, 59 through a rotatable lever 57. The amplitude of the rocking movement may be varied by adjusting the distance between the switches by means of a hand wheel 63 and screwed-rod 62.
Patent GB-583432-A (GB)
Title: Improvements relating to heat interchange apparatus
IPC: F28D7/16
Filed: 1944-10-26
Abstract: 583,432. Oil coolers &c. SERCK RADIATORS, Ltd., and MARTIN, A. M. ,Oct. 26, 1944, Nos. 20877/44 and 1948/45. [Class 64 (iii)] An oil cooler for an aircraft engine, or like heat-exchanger, comprises a hollow cylindrical &c. casing a through which air tubes c extend between end plates b, b and which is provided with an oil inlet f at one end and an oil outlet r at the other end, the oil being caused to flow in a zig-zag path through the said casing by a series of parallel transverse partitions d disposed within the latter. In order to permit cold and viscous oil to' flow direct from the inlet f to the outlet r, a bye-pass tube e is provided, this tube being adapted to extend, preferably axially, through the casing a with one end located opposite the inlet f and the other end terminating at the opposite end of the casing and being formed at this end with perforations g which are controlled by a perforated hollow piston valve h loaded by a spring i. The valve h is normally closed, and the oil flows between the partitions d, but if the oil in the casing is so cold and viscous as to offer a high resistance to flow of the incoming oil then the pressure exerted upon the valve causes the valve to open and remain open until the original oil warms up. In modifications, the oil inlet is formed by the left-hand end of the tube e, which is perforated at this end to permit oil to flow between the adjacent tube plate and partition, and the spacing between the plates d is increased from the inlet to the outlet ends of the casing so that a substantially uniform pressure gradient exists in the oil between the two ends. One or both tube plates b are slidably mounted within the casing to obviate strains in the cooler due to temperature changes, fluid tightness between the plates and casing being secured by glands v.
Patent GB-460239-A (GB)
Title: Improvements in or relating to the production of cast synthetic resins
IPC: B29C67/00
Filed: 1935-07-24
Abstract: <PICT:0460239/IV/1> Shaped resin masses of substantial thickness are cast from polymerizable unsaturated organic compounds having an exothermic reaction and tending to contract during polymerization by disposing the compound in a fluid state in a thin layer in a mould which leaves only the upper surface unconfined, polymerizing the layer to form a solid body, superposing a second thin layer and polymerizing the same, and continuing the process until a body of the desired thickness is produced.  The compound may be used in a partly polymerized syrupy condition. In an example, for producing a rod from methyl methacrylate, a lead mould is used of the kind described in Specification 460,240, [Group XXII].  Liquid resin is poured into the mould and is polymerized for 24 hours at 70 DEG  C., thus contracting to form a layer 14 about 0,5 inches thick.  A second layer 15 is then poured in and polymerized and finally a third layer which fills the mould and the filling space 13.  The finished rod may be turned and ground.  The various layers used may be of contrasting colours.  The compounds used may comprise acrylic and methacrylic acids their homologues and derivatives, including esters such as methyl, ethyl, butyl or phenyl methacrylate, glycol di-methacrylate, vinyl acetate, chloroacetate or chloride, styrene, a -methyl styrene, methyl vinyl ketone, divinyl acetylene, ethylene oxide, acrolein, and dimethyl itaconate. Plasticizers, colouring matter &c. may be added and polymerization may be performed by heat alone or by light, catalysts, &c.  Rods, tubes, and other shaped articles may be produced. Specification 433,540 also is referred to.
Patent GB-745252-A (GB)
Title: Improvements relating to rocket propelled projectiles
Inventor: LOBELLE MARCEL JULES ODILON
IPC: F42B10/16
Filed: 1953-07-29
Abstract: 745,252. Projectiles. M. L. AVIATION CO., Ltd. Aug. 20, 1954 [July 29, 1953], No. 21086/53. Class 9(1) A collapsible fin assembly for a rocket projectile 1 comprises resilient fins 2 wrapped around the periphery of a tubular member 3 surrounding the rocket venturi 4. During storage the fins are held in the collapsed position by a cap 6, with their leading edges 7 engaged in an annular groove 8 in a ring 9 surrounding the body of the rocket. As the rockets are inserted into a discharger, the cap 6 is forced off, the wall of the discharger then serving to hold the fins in the collapsed position. As the rocket leaves the discharger, the fins open out due to their resilience. Each fin has a part 11 with a hooked end 13 which, as the fin opens, moves in a, slot 14 in the member 3 until the hook bears against the edge of the slot, so that the part 11 forms a strut holding the fin extended. The leading edge 7 of each fin has a cutaway part 15 to facilitate engagement with the ring 9.
Patent GB-614651-A (GB)
Title: Improvements in or relating to electrical switching devices having overload release
IPC: H01H71/52
Filed: 1946-07-16
Abstract: 614,651. Electrically-tripped switches. FOSTER TRANSFORMERS & SWITCHGEAR, Ltd., and BAGNALL, R. I. July 16, 1946, No. 21241. [Class 38 (v)] The contacts 6 are movable by a snap-action helical spring 17, to the open and closed positions, by means of a handle 20 pivoted on a bracket 19. A lever 18 rigidly connected to the handle has two arms to which are pivoted at A, B, respectively a lever 21 and a trip lever 24 having a slot 23 which normally engages a pin 22 on the lever 21, causing it to move with the handle. A pin 25 on the lever 21 is connected to one end of the spring 17, the other end being connected to the arm 16 of a yoke piece 9 pivoted at 10 and carrying the contacts 6. The trip lever 24 has a part 26 normally engaging a collar 27 on a slidable shaft 32 controlled by an electromagnet 28 or thermal strip. On overload, the shaft 32 slides, causing the part 26 to disengage the collar 27 thereby permitting the trip lever 24 to release the pin 22 and allow the contacts 6 to open under the action of the spring. The lever slides along a stop 29 under the action of the spring and moves the handle to the open position, also causing the pin 22 to re-engage the slot 23 and an extension 30 of trip lever 18 to engage a conical member 31 on the shaft 32 to reset it. Should the spring break, the switch is opened by the pin 25 engaging a member 16<1> attached to the yoke. A shoe 7 in which the moving contact rods 6 are slidable, is rotatable on a projection 8 of the yoke 9 to an extent limited by a screw 13 and slot 14. Two springs in parallel may be used instead of one, Fig. 8 (not shown).
Patent GB-1060282-A (GB)
Title: Improvements in and relating to physical training equipment
IPC: A63B21/055
Filed: 1964-07-29
Abstract: The present Specification which is divided from Specification 1,060,281 is directed to the mechanical advantage of the cord and pulleys provided in the embodiment of Figs. 5 and 6 of that Specification which enable the exerciser to lift his own weight during exercising but with a correspondingly reduced motion ratio.
Patent GB-248645-A (GB)
Title: An improved process of and apparatus for engraving printing rollers
IPC: B44B3/00
Filed: 1925-08-25
Abstract: 248,645. TeissÞre, A., and TeissÞre, J. Aug. 25, 1925. Engraving.-An engraved roller for printing on textile fabrics is produced by drawing the design on paper, transferring the design to a metallic pattern roller, applying an insulating varnish to form a pattern composed of electric conducting and non-conducting surfaces, and causing a needle containing a tool-operating circuit to travel over the whole surface of the pattern roller while the tool travels over the surface of the printing-roller. Apparatus for carrying out this method comprises rotating pattern and printing rollers a and h respectively, a tracer c and an electromagnetic hammer e, g being moved lengthwise of the rollers by means of screws d, n. Current is supplied to a circuit including the tracer c and the electromagnet e through a transformer i. The tool g may, alternatively, be in the form of a rigid point or a rotary tool. Specification 5187/07, [Class 101, Printing other than letterpress &c.], is referred to.
Patent GB-516255-A (GB)
Title: Improvements in or relating to warp stop mechanisms for textile machines
IPC: D03D51/20
Filed: 1938-07-19
Abstract: 516,255. Warp stop mechanism. BRITISH CELANESE, Ltd. July 19, 1938, No. 21446 Convention date, July 23, 1937. [Class 142 (i)] [Also in Group VIII] Warp stop mechanism for textile machines, e.g., warp knitting machines, comprises a bar 38 having serrations in which are guided detectors 39 which are held in position in the serrations by a flat bar 41. On breakage or undue slackening of a warp thread on which a detector is hung the detector drops in its serration and, as by contact of a projection 43 thereon with a contact bar 44 set in the bar 38, completes an electric circuit to stop the machine. The bars 38, 41 and warp guide bars 47, 48 are adjustable in height. The bar 48 can be lowered to clamp the detectors in the dotted-line position, for threading. The eye of the detector is split as shown and formed with barbs 9b, 9c, which prevent disengagement of the warp thread from the detector. A lug 46 on the detector prevents disengagement from the serrations. The Specification as open to inspection under Sect. 91 comprises setting the contact bar 44 in the bar 41. This subject-matter does not appear in the Specification as accepted.
Patent GB-744240-A (GB)
Title: Improvements relating to shearing machines
IPC: B23D25/08
Filed: 1952-08-27
Abstract: 744,240. Shearing. GUEST, KEEN & NETTLEFOLDS (SOUTH WALES), Ltd., and PHIPPS, G. A. Aug. 21, 1953 [Aug. 27, 1952], No, 21505/52. Class 83 (4). In a shearing machine in which power-driven co-operating shearing tools approaching the shearing zone from opposite sides of the feed path pass through this zone adjacent to but one behind the other, the rearward tool before and during shearing passes along a substantially flat path close to the feed path to support the stock being sheared. The forward tool 11 mounted on a rotating arm 29 performs a circular path passing through the feed path 23 and is driven through 1: 1 gearing by a driving shaft 35 coupled to a variable speed hydraulic or electric motor. The rearward tool 12 is mounted on a projection 37 of a link 36 pivoted on a crank 42 of the driving shaft 35 and connected by a link 43 to a crank 44 geared to rotate at twice the speed of the driving shaft 35. The path of the rearward tool 12 is a closed path having a flat portion adjacent to but not intersecting the feed path 23. The tools 11, 12 are at 45 degrees to the feed path and the rearward tool 12 has a guide-projection 54 to prevent the tools fouling each other. The Provisional Specification states that for each cut the shearing tools are accelerated from an initial position in which the tools are just clear of the shearing zone on the exit side, moved at constant speed through the shearing zone, decelerated and finally reversed to the initial position.
Patent GB-799284-A (GB)
Title: Device for opening sachets made of a thermo-plastic material
IPC: B65D75/58
Filed: 1956-07-11
Abstract: 799,284. Opening packages. CENTRE NATIONAL DE TRANSFUSION SANGUINE, and LEWIN, J. July 11, 1956 [July 11, 1955], No. 21512/56. Classes 94(1) and 133. Satchets made of two thermoplastic sheets 1 sealed by weld lines 2, 3 have a tearstrip 4 of apertured or foraminous material, e.g., loosely-woven fabric interposed between the sheets in the welding zone 3 so that the thermoplastic material in the fused state during welding penetrates the strip 4, which is embedded in the welded joint. One end of the strip is folded over to form a pull tag 5 extending outwards at least as far as the edge of the satchet. By pulling the tag the two walls of the satchet are simultaneously torn and the strip 4 with the portions of the satchet walls extending beyond the strip, wholly removed. The strip may be formed into a loop which forms the pull tag and enables the satchet to be suspended or assembled with other satchets.