baber/WOPTO huggingface dataset:
Patent GB-965448-A (GB)
Title: Improvements in or relating to d.c. restoration in amplifiers
Inventor: CORNEY JOHN VICTOR
IPC: H04N5/18
Filed: 1961-02-16
Abstract: 965,448. Electric retroactive control. FERGUSON RADIO CORPORATION Ltd. Jan. 30, 1962 [Feb. 16, 1961], No.5820/61. Heading G3R. [Also in Divisions H3 and H4] An electrical system (Fig. 2) comprises a D.C. amplifier 11 for amplifying a signal, e.g. a television signal, which includes regularly recurrent intervals during all of which the signal level is constant (Figs. 1a, b, and c, not shown), a sampler 13 connected to the output stage of the amplifier and adapted to sample the signal in said intervals, a comparator 15 adapted to compare the output of the sampler with a first fixed reference potential selected to determine the D.C. level at the amplifier output and to produce an error signal representative of the difference in said compared signals, a second variable reference potential 16 and a driven clamp 17 operable during the said intervals to clamp the level of the input signal to the amplifier to the second reference potential, this potential being responsive to the error signal in such a manner as to reduce any difference between the potential at the output of the sampler and the first reference potential. In one embodiment (Fig. 3) the amplifier comprises cascaded inverters VT2, VT3 and emitter follower VT4. Feedback to the emitter of VT2 is from the junction of R6, R7. The transistor VT7 generates the sampling and clamping pulse and is otherwise normally bottomed thus cutting off the symmetrical transistor VT1, VT5 which comprise the clamp and sampler respectively. The output across C4 is compared by the transistor VT6 with a fixed reference potential at the junction of R10, R11. If the potential on C4 is more positive than the reference potential, VT6 conducts to charge C2 negatively. If the potential on C4 is less positive than the reference potential, VT6 is cut-off and C2 discharges through R9. The input capacitor C1 is charged or discharged from or into the controlled bias source constituted by capacitor C2 during the clamping period when VT1 conducts. Diodes Dl, D2 D3 function to reduce carrier storage in the associated transistors. In a further embodiment (Fig. 4 not shown) the amplifier contains three cascaded inverters and in consequence the comparator is made non inverting in order to provide regenerative bias feedback. Specification 923,173 is referred to.
Patent GB-473869-A (GB)
Title: Weatherproof mirrors
IPC: C03C17/09
Filed: 1937-02-26
Abstract: A weatherproof mirror comprises a material of bad electrical conductivity coated with a layer of pure rhodium by vaporization in vacuo or by cathode disintegration.  Semi-transparent mirrors may be produced by heating rhodium strips in a vacuum of 10-3 mm. and condensing the sublimed metal on materials placed in the vicinity. For fused quartz the surface is first coated with a faultless glazing of blisterless quartz glass and then with a layer of rhodium.  Such mirrors are resistant to sea water and corrosion, will not tarnish in SO2 or H2S and are resistant to wiping.
Patent GB-1056632-A (GB)
Title: A method of dredging and a trailing suction dredging head for use in the method
IPC: E02F3/92
Filed: 1965-02-10
Abstract: 1,056,632. Suction dredgers. W. WITT. Feb. 10, 1965 [Feb. 10, 1964], No. 5873/65. Heading E1F. The towed suction head of a suction dredger has ahead of the intake of the head forwardly directed jetting nozzles for fluidizing the material to be dredged.
Patent GB-707937-A (GB)
Title: Improvements in or relating to actuating means for internal shoe drum brakes for vehicles
Inventor: KINCHIN JOSEPH WARWICK
IPC: F16D51/20
Filed: 1952-03-07
Abstract: 707,937. Internal shoe drum brakes. GIRLING, Ltd. April 13, 1953 [March 7, 1952], No. 5959/52. Class 103(1) In an internally expanding vehicle brake in which two arcuate shoes 10, 11 rock and slide at one end on a stationary anchorage 14 which forms an adjustment device, mounted on a brake plate 12 and are adapted to be separated at the other end by a hydraulic actuator 17, the actuator comprises a single-ended hydraulic cylinder 18 having a limited floating movement on the back-plate of the brake in the direction of movement of the shoe ends, a piston 26 working in the cylinder 18 and engaging one shoe 10, and a lever 29 pivotally mounted in a slot 28 in the closed end of the cylinder, one end of the lever being interposed between the inner end of the slot 28 and the end of the other shoe 11 and the other end of the lever being carried through the back plate and being adapted for connection by a mechanical linkage to a hand lever. When the brake is applied by means of a pedal operated master cylinder, fluid is supplied to a union 24 in the boss 20, which extends through the elongated opening 19 in the back plate 12; the housing being held in frictional engagement with the inner face of the back plate by a spring clip 21, to operate the piston 26. The piston 26 engages directly the web of the brake shoe 10. An annular rubber boot 27 prevents the ingress of dirt &c. into the cylinder. The closed end of the cylinder is formed with a deep slot 28 extending at right angles to the back plate and the flat lever 29 is mounted in this slot. One edge of the lever is shaped to bear against a flat surface at the inner end of the slot and the other edge is curved to engage the end of the web of the second shoe 11 which is guided in a slot 31 parallel to the back plate and intersecting the slot 28 (see Fig. 3 which is a section through 3, 3 of Fig. 1). When liquid pressure forces the piston 26 outwardly and engages the shoe 10 into engagement with the brake drum, the reaction on the housing 17 moves the housing in the opposite direction so that the lever 29 bearing on the flat surface of the slot urges the shoe 11 into engagement with the drum. When the brake is applied by the hand lever 29, the shoe 11 is urged into engagement with the drum and the reaction on the pivot pin 30 moves the housing 17 in the opposite direction so that the piston 26 urges the shoe 10 into engagement with the drum.
Patent GB-723026-A (GB)
Title: Improvements relating to socket holders for plug-in type electrical components
Inventor: SMETHURST JOHN
IPC: H05K7/12
Filed: 1952-03-07
Abstract: 723,026. Two-part couplings. METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Feb. 9, 1953 [March 7, 1952], No. 6014/52. Class 38 (1). Means for retaining a plug-in circuit component 11, e.g. a relay in a socket 1 comprise two resilient bent metal arms 9 hinged in tags 8 bent from a surrounding metal plate 4 and carrying a roller 10 which engages under tension the middle of the top face of the component. The arms 9 may alternatively comprise telescopic members with internal springs or be formed as one U-shaped member, or be formed each with a loop section.
Patent GB-846725-A (GB)
Title: Improvements in or relating to domestic fireplaces
Inventor: JENNISON ALAN ALFRED
IPC: F24B1/188
Filed: 1957-02-22
Abstract: 846,725. Heating air. HAIGHTON Ltd., R. Feb. 20, 1958 [Feb. 22, 1957; Nov. 9, 1957], Nos. 6052/57 and 35002/57. Class 64(3) A domestic fireplace comprises a unit adapted for insertion in an existing firespace, and provided below an ash pan compartment but above hearth level with an opening 19 for conducting air to be heated to space 16 below the ash pan. From the space 16 the air flows upwardly through an air heating passage formed in side walls or, as shown, in a back wall 13 of the fireplace and thence to a forwardly directed air passage 22 having a heated air outlet 23 located above the fire. According to the invention, the forwardly directed air passage is so arranged that when the fireplace unit is placed in position in an existing fireplace there is formed a flue passage defined in part by walls of the existing firespace structure and in part by wall surfaces of the inserted unit. In the form shown, fins 14 are provided on the back wall 13. The air inlet and outlet openings 19, 23 may each be covered by a grid.
Patent GB-500403-A (GB)
Title: Improvements in automatically variable change speed gear device
IPC: F16H33/08
Filed: 1938-02-25
Abstract: 500,403. Variable-speed ratchet gearing. BERLIN, D, W. Feb. 25, 1938, No. 6075. A Specification was laid open to inspection under Sect. 91 of the Acts. Aug. 29, 1938. [Classes 80 (ii) and 80 (iii)] In an automatically variable change-speed gear of the kind with centrifugal weights 2, linked to a driving flywheel 1 and surrounding eccentrics 3, connected to a sleeve 4 which transmits positive and negative impulses to a driven shaft through onoway clutches 8, 9 the clutches for transmitting the impulses are mounted outside the sleeve. The clutches shown comprise rollers which in the operative position are jammed against the outside of the sleeve by eccentric grooves in the co-oporating member. In Fig. 1, the negative impulses are reversed and transferred to a driven shaft 10 by the annular wheol 11, pinions 12 and a spur wheel 13 mounted on the driven shaft. The pinions 12 are mounted on a carrier 14 provided with a one way clutch similar to those around the sleeve 16 which prevents rotation when the negative impulses are being transmitted. At a certain speed of the driven shaft, weights 17 move outwards under centrifugal force and rotate a roller holder 20 by a pin 17d and inclined slots 17e, 17m and thus hold the rollers 16 out of engagement with the carrier. Fig. 4 shows a modification in which, the negative impulses are reversed by bevel wheels 11a, 12a, 13a the wheel 12a being carried in a casing 30 having a clutch 16a, 31 preventing rotation when the negative impulses are being transmitted. As in Fig. 1, when the speed reaches a certain value, weights 17 move outwards and render the clutch 16a, 31 inoperative. This is effected through a double armed lever 36 link 38, arms 38a, 40 carried at opposite ends of a pivot 39 and a link 40a. In each case a reversing device 29 is provided between the driven shaft and a cardan shaft 28. A one way clutch 26 prevents over-running of the driven shaft and in the case of a motor vehicle permits braking by means of the engine. Specification 413,039 is referred to.
Patent GB-177675-A (GB)
Title: Improvements in or relating to hoods for motor cycle side cars and the like
IPC: B62K27/16
Filed: 1921-02-23
Abstract: 177,675. Woodware Supplies, Ltd., and Brown, M. Feb. 23, 1921. Hoods.-An improved hood for side-cars &c. comprises side posts 3, Fig. 1, forwardly and rearwardly directed U-shaped bowmembers 7, 8 pivoted to fittings 9 sliding on the side posts, links 10 connecting the limbs of the members with the posts, and additional bows 11, 12 carried by the links. The posts 3, Fig. 3, are pivoted to angle brackets 4 fixed under plates 5 at the sides of the body, the plates having notches to receive the posts when upright. A pocket 1 is provided to receive the hood, the pocket having hinged lids 13 at the sides and a cover strip at the back held down by press-studs. The lids 13 assist in supporting the posts.
Patent GB-964857-A (GB)
Title: Improvements in bi-metallic temperature-responsive devices suitable for use in thermally-controlled steam-traps
IPC: G01K5/68
Filed: 1963-02-15
Abstract: 964,857. Temperature-responsive actuating- elements. H.R. GERDTS, and W. F. GERDTS, [trading as GUSTAV F. GERDTS K.G.]. Feb. 15, 1963 [March 29,1962; Sept. 12,1962], No. 6132/63. Heading G1D. In a thermally controlled steam trap or other device actuated by a column of bimetallic plates 5 arranged in pairs, with the plates of each pair doming outwardly away from one another, the pairs of plates are separated by distance members 7 which are either cup, leaf or other shaped springs or else are formed by bimetallic members which are flat when cold and form spring elements only when warmed. The distance members 7 may have bent up portions to limit their bending action.
Patent GB-163159-A (GB)
Title: Improvements in or relating to electric switches
IPC: H01H13/02
Filed: 1920-03-01
Abstract: 163,159. Tucker & Co., Ltd., J. H., and Line, W. J. March 1, 1920. Press-button switches; cases; contacts. - Switches have contacts mounted on a block of insulating material which is adapted to be inserted within a metallic casing and retained therein by a leaf spring. The contacts k are mounted on the block m, which is inserted in the casing a, being retained therein by a leaf spring o, which is sprung into position in a transverse recess m of the insulating base. The contact plates k have relatively converging portions adapted to co-operate with the movable contactmember f, which is mounted between insulating washers h, i on the push red c. A coiled spring e interposed between the push button d and the socket b, which is secured to the metallic switch casing. The leads are led through transverse passages q to the terminals l.
Patent GB-746547-A (GB)
Title: Improvements in and relating to door latch mechanism
IPC: E05B65/32
Filed: 1954-03-03
Abstract: 746,547. Door latches. ROETHEL, J. H. March 3, 1954 [May 27, 1953], No. 6209/54. Class 44. A door latch mechanism for a swinging door, Figs. 1, 2 and 3, comprises a supporting plate 10 with a side flange 11, a rotary bolt 12 mounted on plate 10 and secured to a ratchet wheel 14, a detent 15 slidably mounted on plate 10 to engage the ratchet wheel 14, outer manually operable means to slidably actuate the detent 15 to disengage it from the ratchet wheel 14 and including an actuator 19 mounted on the plate 10 which has a part 21 in opposed relation to the detent 15 but permitting separate movement of the detent 15 independently of the actuator 19, and an inner manually operable member pivoted on the plate 10 and having a blocking portion 29b which can be moved by inner operation means into a position to block movement of the actuator 19. The actuator comprises a lever 19 which can be rotated anticlockwise by external means, such as a pushbutton 25, to depress the detent 15 against a spring 26 by engaging the upturned lug 24 and thereby release the bolt 12 for clockwise, or unlatching, rotation. The blocking lever 29 can be moved between two positions by a link attached to end 38, or by a cylinder lock eccentric working in slot 37, and in the position shown prevents actuation of the latch by pushbutton 25. When so blocked the latch may still be operated by means of a bell-crank lever 31 worked from inside the door, by a link attached to end 32, to depress the detent 15 by engaging the portion 34, whereupon the blocking lever is moved out of the way by the downward movement of arm 41 of the detent 15. This automatic unblocking of the mechanism also occurs when the bolt is latched as anti-clockwise rotation of the ratchet wheel 14 cams the detent 15 downwards. Bolt 12 engages a keeper 42 (Fig. 4, not shown) which is constructed in accordance with that of Specification 667,873. A modification of the latch suitable for a rear door of a motor vehicle, Fig. 5, differs in that the blocking lever 56 can be operated only from inside the vehicle and cannot automatically be unblocked, and when in its blocking position it also prevents unlatching by the inner operable bell-crank lever 32 due to the extended arm 54 on the actuating lever 53 which underlies the arm 33 of the lever 32 and replaces the portion 34 of the detent of the first embodiment.
Patent GB-555434-A (GB)
Title: Improvements relating to dial-type indicators, for measuring instruments
IPC: G01D5/04
Filed: 1942-05-08
Abstract: 555,434. Dial indicators. OLDAK, F. May 8, 1942, No. 6263. [Classes 106 (ii) and 106 (iv)] The plunger 5 of a dial-type indicator has an inclined surface on its end for engaging with a pin 8 projecting radially from a member of a gear train to the pointer 3. The inclined surface may be plane as in Fig. 1, curved or hemispherical as in Fig. 5. The plunger may be perpendicular to the casing or horizontal.
Patent GB-196150-A (GB)
Title: Improvements relating to railway and like signals
IPC: B61L5/02
Filed: 1922-03-03
Abstract: 196,150. Kerr, A. March 3, 1922. Rods and wires for operating signalling apparatus.-A signal-resetting device inserted in the run of a signal wire comprises two slidable members 1, 4 connected respectively to the signal lever 6<b> and to the signal 6 and connected by a pawl 3 pivoted on one of them and engaging a tooth on the other until a passing train-wheel rocks the pawl by depressing the trip-lever 5. The members 1, 4 have only relatively sliding motion and the absence of pivotal movement avoids any hammer action between the parts.
Patent GB-575837-A (GB)
Title: Twin fluke anchor
IPC: B63B21/44
Filed: 1944-04-05
Abstract: 575,837. Anchors. DANFORTH, R. S. April 5, 1944, No. 6346. [Class 113 (i)] A twin fluke anchor as described in Specification 553,235 has its rearwardly inclined crown faces 31 extended at 35 in a plane parallel to that of the flukes, thereby enhancing the effectiveness of the lifting surfaces and therefore of the engagement of the flukes with the sea bed. Specification 555,502 also is referred to.
Patent GB-1387872-A (GB)
Title: Electric motor
IPC: H02P25/14
Filed: 1972-02-10
Abstract: 1387872 Control of commutator motors GJC (DEVELOPMENT) Ltd 10 Feb 1972 6353/72 Heading H2J A series wound commutator motor 1 has its field winding arranged in two parts 2, 3, the former being shunted by an adjustable resistor 6 which provides speed control whilst the motor is energized from an A.C. source 4 via a rectifier 5, full speed being obtained by operation of ganged switches 10a-10d to connect the armature 1 and winding part 3 directly to the source 4. The resistor 6 may be replaced by a tapped resistor adjustable by a manual selector switch, Fig. 2 (not shown), or by a potentiometer, Fig. 3 (not shown) or by a thyristor whose firing angle is adjusted by a variable resistor in a control circuit connected across the source 4, Fig. 4 (not shown), the rectifier in this case being a single diode. The thyristor may be prevented from conducting during operation of the ganged switches to produce full speed. Winding part 2 has approximately twice as many turns as part 3.
Patent GB-145822-A (GB)
Title: A new or improved device or reservoir for storing energy, adapted when set free from restraint to operate as a driving mechanism
IPC: A63H29/18
Filed: 1919-03-15
Abstract: 145,822. Wilkins, F. March 15, 1919. Mechanical toys.-Power is stored in and given out by an india-rubber strip j, Fig. 1, which, having its ends attached to a cross-bar l, passes round guide-rollers k, k<1> and through a slot i in a winding and driving shaft f. This shaft is geared to the shaft d of the travelling wheels b through a wheel g and pinion h, the former containing a ratchet, Fig. 3, so that on turning the prime shaft by a handle p the strip is wound thereon as shown in Fig. 4, and thereby stretched to drive, when the road wheels are unlocked. Overstretching is prevented by a screw journal and bearing m, n.
Patent GB-775568-A (GB)
Title: Improvements in or relating to electronic control circuits
Inventor: STOKES JOHN ARTHUR
IPC: H03K4/06
Filed: 1954-03-05
Abstract: 775,568. Pulse modulation; discharge-tube circuits. BRITISH THOMSON-HOUSTON CO., Ltd. March 3, 1955 [March 5, 1954], No. 6527/54. Classes 40(5) and 40(6) A train of pulses varying in phase with the level of a D.C. control voltage (said to provide directional control for the movement of the tracing stylus of an electrically driven profile copying machine) is obtained by generating a triangular wave form with rectangular "guard" pulses at each peak, and using this wave-form plus the D.C. control voltage to trigger a multivibrator. The wave-form, Fig. 2, is generated by applying rectangular pulses of opposite phase to the two inputs of a double Miller integrator V1, V2, Fig. 1. The normal feed-back capacitors C1, C2 provide the basic triangular wave output and this is modified by the addition of resistors R6, R7 to provide a step with a vertical trailing edge at each peak, Fig. 4 (not shown). The valves are also cross connected by networks C5, R8 and C6, R9 of short-time constant to provide a step with a vertical leading edge at each peak, Fig. 5 (not shown), the two steps thereby forming the required "guard" pulse at each peak. It is stated that the two outputs from the anodes may be applied to trip respective trigger circuits when the outputs pass the level of a D.C. control voltage in one direction, and to reset the trigger circuits when the outputs again pass the control voltage in the other direction. The outputs from these trigger circuits are applied to a final trigger circuit to provide an output voltage of substantially constant mark/space ratio and of phase dependent on the level of the control voltage.
Patent GB-824603-A (GB)
Title: Improvements in or relating to screw thread cutting machines
IPC: B23G1/02
Filed: 1958-02-28
Abstract: 824,603. Lathe details. KARLGREN, J. H., and KARLGREN, K. H., [trading as BRODERNA KARLGREN]. Feb. 28, 1958, No. 6540/58. Class 83 (3). In a screw thread-cutting machine, the tool 4a is advanced by a handle 11 to cutting-position against a stop 28, the handle 11 being resilient so that it may be flexed rearwardly to engage a latch 17. The thread-cutting tool 4a is mounted in a turret 3 on a slide 2. The handle 11 is part of a lever 6 pivoted to the slidemounting 1 and engaging in an aperture 10 of the slide 2. A spring 22, assisted by a spring 30, urges the handle 11 to a tool-retracting position, determined by an adjustable rubberfaced stop 25. It is stated that the flexing of the handle prevents vibration of the tool during cutting.
Patent GB-1185775-A (GB)
Title: Improvements in or relating to Suspension Polymerisation
IPC: C08F2/18
Filed: 1968-02-09
Abstract: 1,185,775. Suspension polymerization. FUJI SHASHIN FILM K.K. 9 Feb., 1968 [9 Feb., 1967], No. 6542/68. Heading C3P. The aqueous suspension polymerization of an ethylenically unsaturated compound is carried out in the presence of a dispersing agent and a compound of formula wherein R 1  and R 2  may be the same or different and each represents a hydrogen atom or a methyl group. The polymerizable compound maybe styrene, a (meth)acrylic ester, butadiene, isoprene, acrylonitrile or vinyl acetate. The dispersing agent may be a weakly water soluble salt or a water soluble high molecular weight compound, examples of the former being calcium or magnesium carbonate, zinc oxide, cadmium sulphide or calcium orthophosphate, and examples of the latter are lime treated gelatine, starch, dextrins, saponified polyvinyl acetate, sodium polyacrylate or sulphonated polystyrene. The compound of the above general formula is preferably present in an amount from 0À01 to 10 parts by weight to 100 parts of monomer. In the examples, a styrenemethyl methacrylate copolymer, a methyl methacrylate homopolymer or a styrene homopolymer, are prepared in the presence of benzoyl peroxide as catalyst, and sulphonated polystyrene, lime-treated gelatine or basic magnesium carbonate as dispersing agent, and in the presence of a compound of the above general formula wherein R 1  and R 2  are methyl groups. A fine, transparent grained polymer is obtained.
Patent GB-1133391-A (GB)
Title: Remote control device
IPC: H04M11/00
Filed: 1966-02-15
Abstract: 1,133,391. Substation circuits. M. TROMBETTA. 15 Feb., 1966 [15 Feb., 1965; 21 Sept., 1965], No. 6543/66. Heading H4K. In a system for effecting remote control over a telephone network, ringing current is picked up by an auxiliary microphone M located near the substation set RT and is fed through an amplifier A to energize an amplifier RT1 and also a slow-acting relay RT2. As a result, a relay EL3 operates to lift the handset MT, C, thus tripping the ringing and providing a condition in which an audible signal from the calling party is capable of energizing a control relay RL4. Circuits of the amplifier incorporating transistors are described. In another system, a manual operation diverts incoming ringing current to switch in control circuits including a microphone for the receipt of audible control currents. A verbal acknowledgment may be returned to the caller from a tape recorder.