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    • 1. 发明专利
    • Improvements in and relating to electrical resistors
    • GB633686A
    • 1949-12-19
    • GB527344
    • 1944-05-21
    • PHILIPS NVTHOMAS HOLMES
    • H01C1/146H01C17/20
    • 633,686. Electric resistors. PHILIPS LAMPS, Ltd., and HOLMES, T. May 21, 1944, No. 5273. [Class 37] A resistance comprises an insulated tube, e.g. of glass or a ceramic, an internal coating of carbon deposited from a suitable atmosphere, connecting leads inserted in the ends of the tube, and electrically conducting cement securing 'the wires in position and at the same time sealing the tube ends. The carbon coating is produced by electrically heating a tube 2 of glass, ceramic, &c. in a furnace 3, Fig. 1, by a heating winding 4, to a temperature at which pyrolysis or cracking of vaporized hydrocarbons, e.g. methane, ethane, propane, butane or benzene or a mixture thereof introduced through a tube 1, occurs. The hydrocarbons may be introduced into the furnace only when the cracking temperature is reached and, a diluent such as nitrogen may be used. Alternatively, the tube 2 may first be swept out with such an atmosphere, the flow of gas being continued while the tube 2 is heated to cracking temperature. The flow of gas is continued after switching off the furnace until the tube 2 has cooled to avoid deterioration, e.g. by oxidation of the carbon coating, or the tube 2 sealed at one end could be evacuated and heated to the cracking temperature before introduction of the hydrocarbons with or without a diluent the tube later being cooled as above or after evacuation. The hydrocarbons could entirely surround the tube 2, the external coating being removed after cooling. After cooling the tube 2 is divided into short lengths 7, Fig. 2, and wire connecting leads 5 formed at their interior ends to approximate to the interior diameter of the tube 2 are cemented into the tube ends. The leads 5 are first coated with a carbon suspension known under the Registered Trade Mark " Aquadag " or coated by copper spraying or silvering to improve contact. The cement 6 is then applied and preferably consists of a paste of silvered copper suspended in a solution of thermo-setting or other resin or binding material. After insertion of the coated wire ends the resistor is allowed to air-dry for one hour and then baked at 150‹ C. to cure the resin binder. The ends of the resistor may then be covered with an insulating cement and finally the whole resistormay be coated with lacquer to further seal the ends and then colour coded.
    • 2. 发明专利
    • Improvements in the manufacture of carbon coated resistors
    • GB568285A
    • 1945-03-27
    • GB1506943
    • 1943-09-14
    • PHILIPS NVTHOMAS HOLMESWILLIAM PERCIVAL HUTCHINSON
    • F27D11/02H01B1/24H01C17/20
    • 568,285. Resistance coatings and deposits. PHILIPS LAMPS, Ltd., HOLMES. T., and HUTCHINSON, W. P. Sept. 14, 1943, No. 15069. [Class 37] Carbon resistors are manufactured by passing rods of refractory material through a rotating tube within which hydrocarbon cracking is performed to produce a coating of carbon on the rods in their passage through the tube, the rods while within the tube being rotated. by contact with its inner wall. The rods 11 of steatite, porcelain, glass, silica, &c. are fed by gravity from a hopper 10 and are introduced singly and in succession into the furnace tube 1. by a pusher 12. This is reciprocated by a rocker arm 17 actuated by a cam 16 which is driven from a shaft 15, the drive of which is derived from a motor 13 through reduction gearing 14. The furnace tube 1 consists of refractory material such as silica, glass, steatite, or porcelain, and is of an internal diameter larger than but less than twice the diameter of the rods 11. The tube 1 is continuously rotated by a gear train 18. Adjacent to its outlet end the tube 1 is supported in a ball or roller bearing 3. The hydrocarbon gas to be cracked is introduced into the furnace tube 1 at its delivery end by way of a pipe 7 connected to a supply pipe 6. The pipe 7, which may be of silica or nickel, is of considerably smaller diameter than the tube 1 and extends to a point 8 in the cracking zone. The methane or other gas to be cracked is mixed with a much larger volume of nitrogen or other inert gas. The exit from the pipe 7 may be so disposed as to impart a swirling motion to the emerging gas. The rotating tube 1 is surrounded by a concentric stationary tube 4 of refractory material on which the furnace heating winding is wound. The heater windings may be sectionalised into three parts, a central zone which heats the coating zone of the furnace, a pre-heating zone, and an after-heating zone. The rods may thus be caused to enter the coating zone at a higher temperature than the furnace tube in this zone so that carbon is deposited on the rods rather than on the furnace walls. The furnace tubes 1, 4 are enclosed in a casing 5 packed with heat insulating material. The coated rods on leaving the furnace are received by a chute 9 which delivers them to a receptacle 19. The coated rods may have their resistance value adjusted by grinding away a helical channel and end connections may be made by binding with tinned copper wire and dipping in solder or by fitting metallic end caps. The finished resistances are protected by a lacquer coating.
    • 4. 发明专利
    • Improvements in and relating to electrical condensers
    • GB583493A
    • 1946-12-19
    • GB527444
    • 1944-05-21
    • PHILIPS NVTHOMAS HOLMES
    • H01G4/28
    • 583,493. Condensers. PHILIPS LAMPS, Ltd., and HOLMES, T. May 21, 1944, Nos. 5274 and 10567. [Class 37] The external silver &c. coating 3 of a tubular condenser is carried round one end of a tube 1 of titanium dioxide &c. to the inner surface thereof, as at 4, and connection to the coatings 2, 3 is made inside the tube by wires 7 secured by a conducting cement 8 sealing the ends of the tube. The connection is preferably made in accordance with Specification 566,492. The bore of the tube is closed by an insulating bridge separating the coatings, the bridge being either of a vitreous enamel or being formed integrally with the tube (Fig. 4, not shown). An external vitreous enamel coating 6 is applied and the ends of the condenser are protected by an insulating cement 9, e.g., a thermosetting phenol formaldehyde resin in methylated spirit solution, loaded with a filler such as calcspar or " Alundum " (Registered Trade Mark), or alternatively a thermoplastic resin such as polyvinyl chloride or coumarone similarly loaded. Specification 440,951 also is referred to.
    • 7. 发明专利
    • Improved Electrical Means for Controlling Electrically Driven Apparatus.
    • GB191201569A
    • 1912-12-23
    • GB191201569D
    • 1912-01-19
    • AUTOMATIC ADVERTISING COMPANYHENRY THOMAS HOLMES
    • G09F13/00
    • 1569. Holmes, H. T., and Automatic Advertising Co. Jan. 19. Systems for controlling travel for a fixed distance or number of revolutions.-In means for controlling electrically - driven apparatus, for instance, motor-driven advertisement bands, a shaft c rotated by the apparatus to be controlled drives an arm d , which closes a switch e , e and thereby energizes an electro-magnet f, which attracts its armature f and causes the switch arm e to be moved further, into the position shown in Fig. 3, to release the arm d ; at the same time, the main motor switch a is opened by the electro-magnet. The main switch remains open until the circuit of the electromagnet is opened by band or clock-work at a switch g, whereupon the armature is released and the switch a closed. A lamp h serves to indicate the condition of the electro-magnet circuit. The arm d is carried by a disk d loosely mounted on the shaft c , and is driven by the engagement of a oross-pin c on the shaft with a pin d on the disk. In order to control the intermittent rotation of the shaft c in both directions, for instance, in the case of a band which is drawn from one roller on to another and, at certain times, rewound on to the first roller, the modification shown in Fig. 5 is used, the switch e , e being closed by the engagement of an arm D with an arm E when the motor is running in the reverse direction, The arm D is carried by a disk D driven by a pin C on a toothed wheel C , which is loosely mounted on a shaft C and driven from a gearwheel c on the shaft c'. A number of switches g controlling separate pieces of apparatus may be driven by a single clock-work mechanism.