baber/WOPTO huggingface dataset:
Patent GB-1472878-A (GB)
Title: Braking circuit for alternating current induction motor
IPC: H02P3/22
Filed: 1974-05-23
Abstract: 1472878 Control of A.C. motors WESTING- HOUSE ELECTRIC CORP 23 May 1974 [29 May 1973] 23073/74 Heading H2J A variable-speed electric drive apparatus operable also in a regenerative braking mode comprises an electric motor having polyphase primary windings; an A.C. power unit connected as a source of variable frequency power through supply lines to the primary windings for operation of the motor at variable speeds in a motoring mode, the motor also being operable in a regenerative braking mode; a plurality of impedance means connectible one each to the primary windings in series for raising a regenerative voltage of the motor during the regenerative braking mode to feed back power to the supply lines; and switching means for at least intermittently connecting the impedance means in series with the primary windings during operation in the regenerative braking mode in order to raise the regenerative voltage, and for excluding the impedance means during the motoring mode. In Fig. 1 the primary windings 11 of a three phase squirrel cage traction drive induction motor 10 are supplied by a variable frequency, variable voltage inverter 13 and are interconnected by resistors 14, which are shorted out during the motoring mode by making thyristors 16, 17 conductive and are permanently or intermittently connected during the braking mode by appropriate phase angle control of the thyristors 16, 17, whereby the voltage across the windings 11 is increased to increase the braking torque without having to increase the inverter voltage. Typical torque/speed characteristics for the two modes are discussed, Fig. 3 (not shown), with reference to variation of the effective resistance of resistors 14 to augment the inverter voltage to obtain a desired braking torque. Thyristors 17 may be omitted, the firing signals for the thyristor(s) being obtained from a control circuit 22 receiving the outputs of a brake release circuit 20 responsive to the inverter output, an inverter firing reference circuit 21 and an inverter frequency circuit 23. Fig. 1 provides part regenerative braking (through the inverter 13) and part dynamic braking (through the heat dissipation in resistors 14). Full regenerative braking is provided by a modification, Fig. 4 (not shown), wherein the windings 11 are connected to the primary windings of three transformers (30) whose secondary windings are connected to the D.C. input of the inverter 13 through a rectifier bridge (33), the primary windings being shunted by thyristors 16, 17. Auto-transformers may be used instead of two-winding ones and further simplification is obtained in another modification, Fig. 5 (not shown), wherein the windings 11 are connected to a rectifier bridge (33) whose output is passed to the inverter input through an interphase reactor (35, 36), the bridge (33) being shunted by thyristors 16, 17. The controlled motor may be a synchronous instead of an induction one.
Patent GB-428658-A (GB)
Title: Improvements in, or relating to, electric circuit-breaker systems
IPC: C14B1/12
Filed: 1934-08-10
Abstract: 428,658. Protective cut-out systems. SCHIELE & BRUCHSALER INDUSTRIEWERKE AKT.-GES., Baden-Baden, Germany, and CRABTREE & CO., Ltd., J. A., Lincoln Works, Walsall. Aug. 10, 1934, No. 23121. Convention date, Aug. 10, 1933. [Class 38 (v)] In a cut-out system of the type wherein a main switch 1 is closed by a coil 2 connected in a shunt circuit from the mains in series with an auxiliary switch 4, 5 normally held closed, against the action of a spring 7, by a latch 8 adapted to be released, on overload, by a thermal device, a resetting handle or pushbutton 13 for the auxiliary switch controls a contact-member in the shunt circuit, so that the latter cannot be closed until the handle or push-button has been released after resetting the auxiliary switch. In the arrangement shown in Fig. 2, the contact-member 14 is integral with the push-button 13, and opens the shunt circuit at the points 14a, 14<b> when the button is pressed in to reset the auxiliary switch. The thermal device comprises bimetallic strips 11<a> ... 11<c> in each of the phases of the supply ; on overload, these strips displace an insulating push-rod 12 and release the latch 8. The arrangement may be used for controlling a motor driving a pump, and when it is desired to maintain the liquid in a reservoir at a uniform level, a floatoperated switch 6 may be included in the circuit of the coil 2. In a modification, Fig. 3, the contact 5 of the auxiliary switch is mounted on a leaf spring, which is deflected away from the contact 4 when the button 13 is operated to reset the contact 4. In another arrangement, Fig. 4, a separate push-button 16 is provided for closing the main switch 1, which carries an additional contact-member 15b for maintaining the operating circuit closed. The bimetallic strips 11<a> ... 11<c> are heated from current transformers 17<a> ... 17b. In a modification of this arrangement, Fig. 5, (not shown), the contact-members 14, 16 are operated by a pivoted handle.
Patent GB-1246596-A (GB)
Title: Improved piston ring
IPC: F16J9/26
Filed: 1970-05-13
Abstract: 1,246,596. Piston rings. NIPPON PISTON RING CO. Ltd. 13 May, 1970 [20 May, 1969], No. 23137/70. Heading F2T. A cast iron piston ring 1 has an annular groove 2 in its outer peripheral surface filled with stainless steel 3. The stainless steel is sprayed into the groove and has a radial thickness of 0À2 to 2À0 mm.
Patent GB-710888-A (GB)
Title: Smoke generating and heating units for smokehouses
IPC: A23B4/052
Filed: 1951-10-04
Abstract: 710,888. Thermal switches. DEHN, S. G. (Starr, R. H.). Oct. 4, 1951, No. 23140/51. Class 38(5) [Also in Group VI] A switch 62 opens a circuit to stop heating and circulation of smoke for a smokehouse for hams &c. when a link 63 placed in the path of the smoke fuses, e.g. in case of fire, and closes a circuit containing an alarm signal 64.
Patent GB-687332-A (GB)
Title: Multiple contact electric relays
IPC: H01H63/06
Filed: 1951-10-05
Abstract: 687,332. Electromagnetic relays. FORGES ET ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE JEUMONT. Oct. 5, 1951 [Oct. 6, 1950], No. 23213/51. Class 38 (v) The contact springs of a multiplecontact relay are clamped between a series of tapered insulator blocks 19, 20, 21, 22 &c. which are themselves clamped between two circular segments 23 concentrically arranged one above the other. Each block is shaped as the block 20 in Fig. 3 with a groove 20A, for the reception of a contact spring such as 11, a projection 20B for engaging the groove of the next block and shoulders 20C for engaging the inner sides of the circular rings 23. Each movable   spring 11 lies between a pair of pegs such as 9 on a sector 7 fixed to the armature 3 and is thus actuated positively in both directions.
Patent GB-999693-A (GB)
Title: Improved apparatus for handling a sheet of glass carried on a conveyor
IPC: B65G49/06
Filed: 1962-06-18
Abstract: 999,693. Suction lifting devices. COMPAGNIE DE SAINT-GOBAIN. June 18, 1962 [June 16, 1961], No. 23386/62. Heading B8H. Sheets of glass 3, 4, 5, travelling continuously on a principal conveyer 1 are transferred to a transverse secondary conveyer 7 feeding a cutting machine 6 by a suction frame 21 reciprocated rectilinearly between the conveyers 1, 7. A shaft 8 pivoted in a bearing 9 has mounted on it a toothed wheel 17 and has a lower arm 12 carrying a bearing 13. A chain drivingly connects the toothed wheel 17 to a toothed wheel 16 mounted on a shaft 14 with a lower arm 15 carrying a cylinder 18 with a piston 19 attached to a shaft 20 carrying a toothed wheel 22 at one end and the suction frame 21 at the other. A toothed wheel 23 is freely mounted on the shaft 14 and is connected by a chain to the toothed wheel 22. The wheels 16, 23 are each half the common diameter of the wheels 17, 22 and the arm 12 is equal in length to the arm 15 so that when the wheel 17 is held stationary and the wheel 23 is locked to the arm 12 rotation of the shaft 8 causes the frame 21 to move rectilinearly in a direction parallel to itself. The frame 21 is lowered to pick-up a sheet of glass 5 from the conveyer 1 by movement of the piston 19 in the cylinder 18, a pin 12a being disengaged so that the frame 21 can follow the sheet of glass 5 along the conveyer 1. When the suction cups have had time to seat the frame 21 is raised, wheel 23 is locked by the pin 12a, shaft 8 is rotated and the sheet of glass 5 is transferred from the conveyer 1 to a position over the conveyer 7. The pin 12a is unlocked and the wheel 17 is rotated by a cylinder and rod 25, 24 to bring the sheet of glass into contact with a set of rubber rollers 26 against which it is aligned. A contact 27 on one of the rollers 26 initiates deposition of the sheet of glass on to the conveyer 7, a safety contact E, depressed by a sheet of glass on the conveyer 7 prevents further sheets of glass being deposited if one is already on the conveyer 7.
Patent GB-457517-A (GB)
Title: Improvements relating to screw tapping machines
IPC: B23B31/08
Filed: 1935-08-21
Abstract: 457,517. Yielding - drive for taps; slipping clutches. ARCHDALE & CO., Ltd., J., JEWSBURY, J., and PIERCE, B. L., Ledsam Street, Birmingham. Aug. 21, 1935, No. 23453. [Class 83 (iii)] [See also Group XXIV] In a yielding-drive device for a tapping- machine, the machine spindle a is formed hollow so as to receive the shank b of the tap chuck c, longitudinal grooves being formed in the shank to engage rows of balls e located in radial recesses in the spindle a. A split sleeve f normally maintains the balls in engagement with the grooves to drive the tap but allows the balls to yield and stop the drive when the tap encounters excessive resistance. The sleeve is fixed axially by collars g on the spindle and is prevented from rotating by pegs h engaging the split h<1> therein. A spring i in the spindle engages a thrust washer on the shank b so that feed of the spindle may continue without damage after rotation of the tap has stopped. Axial movement of the shank within the spindle is limited by the balls engaging the ends of the grooves, or a shoulder on the shank. In a modification the radial recesses in the spindle are replaced by axial slots which receive cylindrical rollers engaging the grooves of the shank, a ball being placed at each end of each roller.
Patent GB-719939-A (GB)
Title: Material separating apparatus
Inventor: WEBER DON ANDREW
IPC: B03B5/04
Filed: 1951-10-09
Abstract: 719,939. Separating solid materials. DEISTER CONCENTRATOR CO. Oct. 9, 1951, No. 23485/51. Class 117 A separator has a rectilinearly reciprocating imperforate deck tilted to provide a high side and a 'low side, the high side forming an acute angle with the direction of reciprocation and a substantial part of the high side being arranged to spill material over the edge. As shown in Figs. 1 and 2 a deck 31 of a concenrtrator table is reciprocated by a mechanism 3 and has riffles 32 generally parallel to the direction of reciprocation. The deck is mounted on a sub-frame 12 which may be tilted about an axis parallel to the direction of reciprocation by adjustment of wedges 28 so that the side which is nearer material feed box 33 and which is inclined to the direction of reciprocation by adjustment of opposite side. Sub. frame 12 is mounted on a base frame 4 which may also be tilted by shims under bolts 9 securing it to piers 6 so that the end nearer mechanism 3 is lower than the opposite end. Water from a launder box 34 carries light particles towards the low side while heavy particles travel towards the high end. To avoid heavy particles having to travel along the length of the high side before delivery, adjustable openings 37, 38, 39 are provided for delivery along the high side. interference from the launder water being prevented by baffles Fig. 5 (not shown). Alternative positions for the feed box, deck shapes, and extents of the riffles are discussed, Figs. 6-9 (not shown). In Fig. 11 feed box 33 and launder box 34 are not carried by deck 31 but are adjustably mounted on a framework 50 attached to sub frame 12 so that load on the deck is reduced.
Patent GB-186806-A (GB)
Title: Improvements in soot blowers for boilers
IPC: F28G3/16
Filed: 1921-09-03
Abstract: 186,806. Bennett, J. C., and Bennett, G. C. Sept. 3, 1921. Cleaning, fluid-pressure processes for.- Relates to steam-jet apparatus for removing soot from the exterior surfaces of the tubes of water-tube boilers, and comprises one or more tubular blowers mounted for rotation and simultaneo\I# axial motion in screw-threaded bearings in holders or seatings permanently mounted in the boiler setting. Each blower tube 6, carrying flush nozzles 16, is threaded to engaga with the seating 1 in the boiler setting 2. A chain-driven sprocket. wheel 14 imparts a rotary movement to the blower. Steam is admitted from the supply pipe 22 to the casing 8, and by ports 43 to the blower tube. A stem 41 within the casing 8 engages, by means of threads of the same pitch as those of the seating 1, with the blower arm. A second seating 20, or a supporting-bracket, clamped to one of the boiler tubes, may be used to support the other end of the blower tube.
Patent GB-1047575-A (GB)
Title: Improvements in or relating to anti-friction transmission mechanism
IPC: F16H25/24
Filed: 1965-06-02
Abstract: 1,047,575. Bearings; screw and nut gearing; couplings. A. M. MAROTH. June 2, 1965 [Jan. 27, 1965], No. 23545/65. Headings F2A, F2Q and F2U. In a screw-threaded or splined joint the threads or spline grooves of one element are engaged by rotatable radial rollers carried by the other element and mounted in anti - friction bearings. In the threaded joint shown in Fig. 3, the nut member 14 carries a series of radial rollers 28 with tapered ends engaging the thread 12 on the shaft 10, each roller being mounted in a needle-roller bearing 48 and having an end thrust collar 50. In the arrangement according to Fig. 7, the collar 50 is replaced by a tapered portion 56 engaging bearing balls 52 in a cage 54 which is radially adjustable by a screw plug 60. In a further embodiment for accommodating offset loads, Fig. 9 (not shown), the tapered rollers are supplemented by spring- loaded plungers (81) carrying rollers (82) whose peripheries engage the base of the threads. Fig. 10 shows an arrangement in which a pair of radial rollers 78 loaded by spring- washers 85 bear against opposite sides of adjacent threads 12 to avoid backlash, and Fig. 11 a similar arrangement applied to a splined coupling between a shaft 86 and sleeve 87.
Patent GB-881439-A (GB)
Title: Rotary seal
Inventor: WILKINSON SAMUEL CLIFFORD WALT
IPC: F16J15/38
Filed: 1959-07-09
Abstract: 881,439. Stuffing-box substitutes. CRANE PACKING Ltd. June 29, 1960 [July 9, 1959], No. 23581/59. Class 122 (5). In a mechanical seal for a rotary shaft 1 and comprising a rotary seal ring 3 urged axially by a spring 1 into sealing contact with a stationary seal ring 4, the ring 3 is drivably connected to the shaft by at least one key 17 in the form of a flat strip, engaging a keyway 18 in the ring 3 and in a collar 15 secured to the shaft. Preferably, two diametrically-opposed keys which may be of tungsten carbide, are used. The ring 3 is sealed to the shaft by an 0-ring 12 and the spring 10 is compressed between a thrust ring 11 and a locating ring 14 having keyways 18 and a step portion 21. The keys 17 are axially located by a locking ring comprising two part-rings 20 that engage a groove 19 in a sleeve 9 and fit around the step 21 with one end of each part-ring engaging a notch 22 (Fig. 3), in one of the keys. The part-rings 20 are inserted or removed by pressing the locating ring 14 forward against the spring 10. The seal ring 4 is sealed to the shaft housing 2 by an 0-ring 5 and prevented from rotating by a pin 6. Cooling fluid is supplied through a bore 7 in the shaft housing. In a modification, Fig. 5 (not shown), the rotary seal ring 3 is replaced by a seal ring surrounded by a driving band having keyways therein for the keys 17. In a further modification, Fig. 7 (not shown), the 0-ring 12 is replaced by a wedge-section packing ring. The invention is stated to be applicable also when the ring 5 is sealed to the shaft by a flexible bellows in which case the band that clamps the bellows on to the shaft may be positively driven by the keys, for example by pegs on the band-engaging apertures 32 in the keys.
Patent GB-807068-A (GB)
Title: An extensible belt conveyor
IPC: E21F13/02
Filed: 1954-08-13
Abstract: 807,068. Vehicle steering. TRIGGS, W. W. (Joy Manufacturing Co.). April 13, 1955. [Aug. 13, 1954 (2)], Nos. 23615/54 and 23617/54. Class 79 (5) [Also in Group XXX]. In a belt conveyer (see Group XXX) comprising two self-propelled vehicles 1, 2, Fig. 18, the former supporting driving and take-up mechanism for a conveyer belt 3 and the latter a tail drum for the belt, the vehicle 1 is equipped with four-wheel steering. Its front wheels 64, Fig. 13 are driven by separate motors 67 driving through worm gearing swing stub axles carried by mountings 70 on an axle 71. Rear wheels 65 are mounted on the ends of a tilting axle 75 mounted on pins 78. The steering linkage comprises track rods 73, 77 and arms 87, 88 connected by respective drag links 89, 90 to levers 91, 92 interconnected to a link 93 arranged to give simultaneous equal and opposite movements of front and rear wheels. A segment 100 rotated by a handwheel 99 acts through a link 102 on one end of a lever 103 pivoted between its end to a control valve 107 for a double-acting hydraulic cylinder 94 pivoted to the vehicle frame and having its piston rod 97 pivotally connected to lever 91. The other end of lever 103 is pivoted to a rearward extension 104 of drag link 90. Steering of front and rear wheels is effected in opposite directions by outward and inward movement of the .stem 106 of valve 107 under control of wheel 99, while manual steering is also possible if the fluid supply is cut off.
Patent GB-251841-A (GB)
Title: Improved firing mechanism for automatic pistols
IPC: F41A17/32
Filed: 1925-09-22
Abstract: 251,841. Schmeisser, H., and Schmeisser, H. Sept. 22, 1925. Breech action, slidiny breech-block.-An automatic pistol of the kind having no positive lock is provided with special firing mechanism adjustable for single-shot and continuous firing and with a safety device operated by a thumb-piece on the rear plate of the breech casing. The firing mechanism comprises a sear 13, sear-operating rod 11 having at its rear end a pawl 12, a trigger engaging the pawl 12, and an interrupter lever 6 adapted to be rocked by the reciprocating breech-block 1 and having at its rear end an arm 9 which can be adjusted by a transverse bolt 14 so that it either engages under the pawl 12, as shown in Fig. 5, for single-shot firing, or is free, as shown in Fig. 6, for continuous firing. For single-shot firing, the interrupter, when it is rocked by the breech-block, lifts the pawl 12 and breaks the connection between the sear-operating rod and the trigger. The firing pin 2 is, as shown, rigidly connected to the breech-block 1, both these parts being pressed forwards by a spring 3. The safety device comprises a rotatable disc 23, connected to an external thumbpiece 21, having a hooked arm 24 adapted to engage a flange 18 on the firing pin, the flange having a gap corresponding to the off position of the safety device.
Patent GB-729817-A (GB)
Title: Improvements in or relating to apparatus for detecting the presence or absence of a conducting or magnetic object
IPC: G01P3/66
Filed: 1952-01-10
Abstract: 729,817. Electric tests. GENERAL ELECTRIC CO., Ltd., DAVIS, G. E., and IRVING, H. D. April 10, 1953 [Jan. 10, 1952; April 10, 1953], No. 23631/51. Class 37. Apparatus for indicating the presence of a magnetic or electrically conductive body comprises an H-shaped core 10 (Fig. 1), having an A.C. energizing winding 11 on the centre limb, and similar secondary windings 12 on the other limbs connected in series opposition to give no resultant output voltage at terminals 13 except when the flux distribution is disturbed by the presence of such a body 14. The detector may be used to sense over-shooting of a reciprocating table, e.g. of a planing machine, to effect reversal of the direction of movement, or to effect operation of a cutter when a predetermined length of steel bar is extruded on to rollers. Two such detectors may be located along the line of travel of a body to determine its speed by noting the time interval between responses in the detector, and may be used to control braking equipment. As shown (Fig. 2), a detector 20 when affected by a passing body fires a thyratron 21 to energize a relay 22 and close contacts 25, thereby initiating the charging of a condenser 32, so that after a certain time interval a thyratron 26 also fires to energize relay 27 and open contacts 34. A further detector 44 is located in the path of the body, which, when affected, fires a thyratron 42 to energize relay 41 and close contacts 40, which are connected in series with contacts 34 to terminals 45 and a brake control circuit. If thyratron 42 fires before thyratron 26, contacts 34, 40 are simultaneously closed, and a brake is brought into action. A third detector 46 is located beyond the normal end position of the moving body, so that the brake is applied if the body overshoots its desired final position. The invention may be applied to the lift cage in a mine, or to the movement of tubs on a rail. In a further embodiment (Fig. 6) one' detector 124 senses the end of a metal strip 120 passing through strip rolling and reeling machinery, and a second detector 128 is located near the reel 122 on which the strip is being wound, to stop the driving motor 123 at a predetermined diameter of material on the reel.
Patent GB-869826-A (GB)
Title: Process for the manufacture of trimethylenetrinitramine
Filed: 1957-07-25
Abstract: In a process for the manufacture of trimethylene trinitramine by the nitration of hexamethylenetetramine or hexamethylenetetramine dinitrate, the mother liquor obtained upon the separation of the trimethylene trinitramine is evaporated and the gas mixture so produced is heated (e.g. at 350 DEG  to 500 DEG C.) to decompose the nitric acid and to decompose into nitric oxide and oxygen at least part of the nitrogen dioxide formed, the heated gas mixture is rapidly cooled to separate an aqueous condensate which is but slightly acid, and the remaining uncondensed gases are used to produce concentrated nitric acid.  Nitrous gases evolved during the oxidation or decomposition of by-products of the nitration may be used with the uncondensed gases for the production of concentrated nitric acid.  The aqueous condensate may be used to dilute the nitric acid solution subsequent to nitration, in order to precipitate trimethylene trinitramine from said solution,ALSO:A process for the manufacture of trimethylene trinitramine by the nitration of hexamethylentetramine or hexamethylenetetramine dinitrate comprises evaporating the mother liquor from the separation of the trimethylene trinitramine; heating the gas mixture so produced to a temperature in the range of 350 to 500 DEG C. to decompose nitric acid into nitric oxide and oxygen at least part of the nitrogen dioxide formed, rapidly cooling the heated gas mixture to separate an aqueous concentrate which is but slightly acid and producing concentrated nitric acid from the uncondensed gases.  The nitrous gases involved in the oxidation or decomposition of the by-products of the nitration may be mixed with cool and condensed gases and used in the production of concentrated nitric acid.  The reaction mixture is preferably diluted to give a nitric acid concentration of 55 to 60% at the stage of precipitation and separation of the trimethylene trinitramine. This dilution is preferably effected with part of the aqueous condensate hereinbefore referred to.