OMPI – Búsqueda en las colecciones de patentes nacionales e internacionales

1.670943Improvements in and relating to means for measuring the resistance of alternating current apparatus

GB - 30.04.1952

Clasificación Internacional G01R 27/02 Nº de solicitud 1756350 Solicitante BRITISH THOMSON HOUSTON CO LTD Inventor/a

670,943. Bridge circuits. BRITISH THOMSON-HOUSTON CO., Ltd. July 13, 1950 [July 26, 1949], No. 17563/50. Class 37. A Wheatstone bridge is arranged for measuring the resistance of an A.C. energized winding, such as a transformer winding or a motor stator winding, without de-energizing the winding. A load such as the stator winding 9, Fig. 1, of a motor is energized from the secondary winding 5 of a transformer 3. A transformer 12 has its primary winding 13 connected across the secondary winding 5 and its secondary winding 16 connected in series with the winding 9 to form one arm of a Wheatstone bridge 18. A blocking capacitor 23 blocks D.C. from the primary winding 13. The voltage developed in the transformer secondary winding 16 is equal to and 180 degrees out of phase with the voltage across the winding 9 so that no A.C. voltage appears across the terminals 19, 21 of the bridge, which measures the resistance of the load winding 9 and transformer secondary winding 16. The resistance of the winding 16 is measured in advance, so that the bridge 18 can be calibrated to read the resistance of the winding 9 directly. A double-pole switch 25 may be provided for connecting the transformer windings 13, 16 when a measurement is to be made. In a modification, Fig. 3, a low-pass filter circuit 32 comprising a series connected reactance 33 and filter capacitor 34 ,is employed instead of the transformer 12, the resonant frequency, of the filter circuit being below the frequency of the energizing voltage. Since substantially no voltage appears across the capacitor 34, all the voltage appearing across the terminals 10, 11 of the load winding 9 appears across the reactance 33, so that no A.C. voltage appears across the bridge terminals 19, 21. A capacitor 23 blocks D.C. from the circuit to which the load winding 9 is connected, so that the bridge 18 measures only the resistance of the load winding 9 and the known resistance of the reactor 33. A fuse 36 is provided in series with the filter 32 to protect the circuit. in the event of resonance between the filter capacitor 34 and the load inductance 9. Fig. 4 shows a modification for measuring the resistance of any part 39 of a series of A.C. energized windings 38. The reactance 33 is arranged in series between the side 40 of the winding 39 and the terminal 19 of the bridge 18, the side 41 of the winding 39 being connected directly to the bridge terminal 21 and the filter capacitor 34 being connected across the bridge terminals 19, 21. The circuit of Fig. 1 may also be employed to measure the resistance of part of an A.C. winding.

2.670997Improvements in or relating to paper roll holders and their manufacture

GB - 30.04.1952

Clasificación Internacional A47K 10/40 Nº de solicitud 2356249 Solicitante W B C PACKINGS LTD Inventor/a ANSELL JEFFREY MAURICE

670,997. Roll holders. W. B. C. (PACKINGS), Ltd. Nov. 2, 1950 [Sept. 13, 1949], No. 23562/49. Class 18 The blade 17, for serving a length of paper from a roll mounted on a spindle between two brackets 2, is attached at each end to a tubular member 9 telescopically fitted and resiliently urged within a second tubular member 4 so that the blade 17 is resiliently maintained in contact with the roll. A spring 16 may be attached to opposite ends of the members to resiliently urge the one within the other. The members 4 are rigidly secured to the brackets by a nut engaging a stud 7 projecting through the bracket from a square boss 6 adapted to engage in a similarly shaped hole in the bracket. The boss 6 is permanently secured to the member 4 so that by adjusting the position of the boss 6 in the hole the blade 17 can be suitably positioned with respect to any position occupied by the brackets 2. In an alternative arrangement, two tubular members, one slidable within the other, may be slidably mounted in the fixed tubular member 4.

3.671038Improved method of and apparatus for countercurrent contacting of solids with liquids

GB - 30.04.1952

Clasificación Internacional B01D 11/02 Nº de solicitud 2900648 Solicitante STANDARD OIL DEV CO Inventor/a

671,038. Making extracts. STANDARD OIL DEVELOPMENT CO. Nov. 8, 1948 [Dec. 6, 1947], No. 29006/48. Class 81 (i). [Also in Group II] A method of contacting a liquid with granular solids of approximate particle size 20-200 mesh per linear inch in contiguous superposed zones separated by perforated partitions comprises, introducing said solids into an upper zone and introducing said liquid into a lower zone, thereafter passing said liquid upwardly through successive superimposed zones to said upper zone, said liquid being introduced to each of said zones at a plurality of points at the lower level of each zone at an upward velocity not exceeding approx. 1-5 feet per minute (to maintain a slurry in each zone, surmounted by a liquid layer) and being removed from the upper zone; maintaining the solids in a restricted column extending between adjoining zones as a dense slurry phase and preventing substantial liquid flow through said column whereby the solids flow downwardly through successive zones and are removed from said lower zone. The apparatus shown has perforated plates 25 on which the slurry phase is maintained and downcomers 6 to accommodate the columns of dense slurry. The solids enter at 2 and leave at the bottom and the liquid flows in at 5 and out at 4. Vanes 9 can be rotated to seal the downcomers until the dense slurry column is initially formed. The zones are separated by plates 15 and the pumps 17, with pipes 16 and 18, are provided to increase the pressure differential, and thus the throughput, of the apparatus.

4.671065Improvements in and relating to control mechanisms for electric motor control gear

GB - 30.04.1952

Clasificación Internacional H02P 1/06 Nº de solicitud 1895549 Solicitante ENGLISH ELECTRIC CO LTD Inventor/a BENNETT JAMES HOLMES

671,065. Controllers. ENGLISH ELECTRIC CO., Ltd. July 18, 1950. [July 19, 1949] No. 18955/49. Class 38 (iii). Coarse adjustment of a rheostat used for electric motor control is effected when a lever 3 is rotated to operate a chain 8, a bevel gear wheel 10 meshing with wheel 9 which is fixed to the operating-shaft 6. The lever 3 is freely journalled in a fork 5 which is in turn free to rotate on shaft 6 and which carries a balance weight 12. Fine adjustment is afforded by limited operation of the chain when the lever 3 is moved, without rotating it, in either direction in a quadrant 2. The lever may then be released and returned to a central position without operating the chain 8, the bevel gear wheel 10 idling over the wheel 9. The application to the individual control of a number of motors in a rolling mill drive is referred to. The rheostat may be operated directly from the shaft 6, through other mechanical drives, or through a servo system. The weight 12 may be replaced by a spring. Position-indicating devices may be carried on the knob 11 or the chain 8. Specification 621,067 is referred to.

5.671135Improvements in or relating to transmitter-receiver radio communication systems

GB - 30.04.1952

Clasificación Internacional G01S 13/78 Nº de solicitud 267449 Solicitante MINI OF SUPPLY Inventor/a MILLS JOHN ROBERT

671,135. Pulse modulation systems; radiolocation. MINISTER OF SUPPLY. Jan. 27, 1950 [Jan. 31, 1949], No. 2674/49. Classes 40 (v) and 40 (vii). An intelligence transmission system comprises a transmitter station, which may be a radar responder, radiating groups of pulses the spacings between the individual pulses of which are characteristic of the elements of intelligence (e.g. dots and dashes) to be transmitted, and a receiver comprising a plurality of coincidence circuits each of which delivers an output signal only in response to a particular group of pulses corresponding to a particular element, an equal plurality of integrator circuits each associated with the output of a coincidence circuit and operating means to present the appropriate element of intelligence when the integrated output signals reach a predetermined level. In one embodiment, in which the receiver is associated with the interrogator 1 of a radar system and the transmitter comprises a responder beacon 2, pulses radiated from the interrogator at, for example, a p.r.f. of 150 per sec. each initiate the transmission of a group of pulses from the beacon. These groups may be pulse pairs, the spacing between which is different according to whether a dot or a dash is being transmitted. The relative length of the dot and dash transmissions (that is the relative number of pulse groups in each) is the same as in normal signalling. At the receiver 3 a locally generated strobe pulse derived over line 1A each time an interrogation pulse is transmitted is automatically locked to the first response pulse and fed through delay lines in circuits 6 and 7 corresponding to the pulse pair spacings for dots and dashes respectively to open gate circuits so that pulses corresponding to " dot " groups are passed by circuit 6 and pulses corresponding to " dash " groups by circuit 7. These two series of pulses are fed respectively - to integrators 8 and 9. The integrators are arranged to trigger the presentation means 10 even though some pulse groups are lost in transmission and yet not to operate in response to interfering pulses accidentally possessing suitable spacing but not being repeated as are the true signals. They are also arranged to fail to operate when signals are applied to them at less than a certain frequency. The presentation means may comprise a local audiofrequency generator keyed by the integrator outputs to provide dots and dashes in a headphone circuit. The integrator circuits are described with respect to Fig. 2 (not shown). Radiolocation. The interrogator pulses are also fed from unit 1 to range circuit 4 when the time elapsing between their arrival and that of the first response pulse from receiver 3 is determined and used to indicate range, reply pulses other than the first in each pulse group are prevented from having any effect on the range circuits. A p.r.f. considerably less than that required for intelligence transmission is adequate for range determination and the interrogator may be arranged normally to operate at a p.r.f. of 30 per sec. at which frequency range will be shown but the reply pulses will not be frequent enough to operate the integrator circuits. When it is desired to receive communications from the beacon the p.r.f. is increased, this arrangement enables a number of craft to use the beacon at the same time with a minimum of interference one with another. The pulse pairs used for signalling may be followed by a further pulse, after a constant delay characteristic of the beacon, for beacon identification purposes.

6.671163Improvements in bimetal strip thermostatic switches

GB - 30.04.1952

Clasificación Internacional H01H 37/52 Nº de solicitud 684450 Solicitante PERMA SA Inventor/a

671,163. Thermal switches. PERMA SOC. ANON. March 20, 1950. [March 23, 1949] No. 6844/50. Class 38 (v). A thermal switch for controlling the temperature of an electric heater 2, comprises a frame 1 with a pin 5 on which are freely pivoted a bimetallic strip 3 and a metal supporting member 6, the latter supporting flexible blade. contact carrying members 8, 9. As the temperature of the heater rises, the blade 3 deforms, its middle portion coming into contact with the heater 2 and its free end lifting a push piece 12 secured to the blade 9, so as to raise the free end of the blade 9 to open the contacts 11. An adjusting screw 18 carried by the frame 1, has a tip which engages the end of the member 6 to determine the extent to which the bimetallic strip must deform to cause opening of the contacts.

7.671175Soluble zirconium sulphate salt compositions and method for preparing the same

GB - 30.04.1952

Clasificación Internacional C01G 25/06 Nº de solicitud 1222650 Solicitante TITAN CO INC Inventor/a

An ammonium zirconium sulphate composition is produced by heating at 400-600 DEG C for 5 minutes to 2 hours a comminuted admixture of 1 mol. zirconium oxide and 2-3.5 mols. ammonium slphate. Baddeleyite or commercial zirconia may be used. The composition of the product varies with the heating time and temperature, and comprises ammonium 2-12 per cent, cationic hydrogen not greater than 0.7 per cent, zirconium oxide ZrO 20-30 per cent and sulphate 55-70 per cent. The salt (NH4)2 H2ZrO (SO4)3 may be produced. The reactant mixture is heated as a layer, e.g., in stainless steel trays.

8.671189Improvements in and relating to apparatus for grading apples and like fruit

GB - 30.04.1952

Clasificación Internacional B07B 13/07 Nº de solicitud 1716550 Solicitante ANDRIES WILHELM JANSEN Inventor/a

671,189. Fruit grading apparatus. JANSEN, A. W. July 10, 1950 [Aug. 9, 1949], No. 17165/50. Class 117 In a fruit grading apparatus comprising a transversely inclined conveyer belt 1 with a guide 4-8 at its ower side having grading spaces of increasing height in the direction of travel, the profiles of the cross-sections of the guide throughout its length subtend the same angle d with the belt. As shown in Figs. 1 and 2 the guide comprises a number of strips 4, 5, 6, 7 and 8 arranged with their lower edges in steps both transversely and longitudinally to provide a series of guiding edges and grading spaces respectively for the various sizes of fruit, the lowermost strip 8 being terminated in the direction of travel. Fig. 3 shows an arrangement wherein transversely stepped guiding strips 4, 5, 6, 7, 8 and 8a have an upward slope in the direction of travel, the strips being terminated where their lower edges reach just above the height of the largest fruit dealt with. In this case the lowermost strip 8a extends throughout the grading length of the belt and the partitions 10 dividing the collecting table 9 may be positioned for any desired size ranges. The strip 8a may be adjustable.

9.671216Improvements in or relating to printing and/or embossing machines

GB - 30.04.1952

Clasificación Internacional G07B 17/00 Nº de solicitud 3154448 Solicitante RONEO NEOPOST LTD Inventor/a

671,216. Postmarking-machines. RONEONEOPOST, Ltd., and LANGDON, F. E. Dec. 6, 1949 [Dec, 6, 1948], No. 31544/48. Class 100 (ii). In a rotary printing or embossing machine, particularly for franking insurance cards, and of the kind in which there is a counting-device which locks the printing &c. mechanism after a predetermned number of printing &c. operations have been performed, and a supporting roller in the base of the machine which co-operates with the printing &c. mechanism, a small frame is secured over the base in such a position as to indicate the area on a card, placed between the printing &c. mechanism and the base, which will be printed &c. by operation of the machine. As shown, the machine comprises a unit 1, detachable from the main body 2, which contains a printing-drum, and has a small frame 6 in the nature of a window attached to the bottom of the unit so that it will indicate the area where printing &c. will be effected. The base 3 contains a freely rotatable rubber impression roller mounted on a shaft so as to project through a slot in the base. The printing-drum is mounted on a shaft which is clutched to a handle 10. The unit 1 has a lid 5.

10.671230Improvements in umbrellas, parasols and the like

GB - 30.04.1952

Clasificación Internacional A45B 25/10 Nº de solicitud 2905549 Solicitante T H LAWTON & CO MANCHESTER LTD Inventor/a

671,230. Umbrellas. LAWTON & CO. (MANCHESTER), Ltd., T. H., and SCHAEFER, G. M. Nov. 13, 1950 [Nov. 14, 1949], No. 29055/49. Class 134. The upper or lower end of the stick 1 is threaded and carries a disc 3 recessed at 7 for a label 8, and lower disc 6 of transparent material screwed on to the stick.

1 / 244.204

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