Abstract: A pressure sensor of the type having a semiconductor diaphragm such as a silicon diaphragm which is formed with at least one diffused resistor in a surface region on one side thereof. A silicon block having the diaphragm is bonded to the inside of a box-like package such that the diffused resistor is exposed in a vacuum chamber defined in the package and that a fluid pressure can arrive at the back side of the diaphragm through a hole of the package. To minimize unwanted straining of the silicon diaphragm by thermal influences, the package is made of a material such as mullite whose linear expansion coefficient is close to that of silicon. To prevent an accidental change in the output characteristic of the sensor by the influence of an unintended external force, the package is supported above a base plate by pillar-like lead frames and confined in a space provided by fixing a cap to the base plate. A pressure introduction pipe is attached to either the base plate or the cap.
Abstract: A method for assembling successive ducts end to end with a pipe-line constituted by the assembled ducts comprising: providing inner equipments for said ducts each comprising means for vacuum-tight connection with the inside of a duct and means protruding from the duct for vacuum tight connection with the pipe-line; placing said inner equipments in each successive duct in an equipping station, connecting said equipment to the inside of the duct at both ends to close an inner vacuum tight space inside the duct; connecting said space to pumping means and evacuating said inner space by said pumping means while transferring said duct and inner equipment from said equipping station to a welding station; positioning said duct in alignment and abutment end to end with the pipe-line in said welding station; locking the duct in fixed position with respect to the pipe-line, sealingly connecting said equipment with the pipe-line inside the pipe-line; and sealingly connecting a vacuum tight welding chamber of a rotary wel
Abstract: The ceramic body of a monolithic ceramic capacitor consists of a granular barium titanate phase and a relatively low temperature melting intergranular phase. The body is capable of exhibiting a very high dielectric constant, e.g., over 5000, a Curie temperature of near 25.degree. C., and may be fired to maturity at 1150.degree. C. or lower and contain low cost buried electrodes. These properties obtain from a narrow range of compositions for which charge balance and large/small cation stoichiometry in the total formulation are found to be very critical. Cd, Zn, Cu, Li and Na are found to enter the grains as large acceptor cations on Ba sites and may be charge compensated by the small donor cations of charge +5, Bi, Sb, Nb and Ta or by the small donor cations of charge +6, W and Mo, on the Ti sites. At least 0.3 mole percent of glass-former cations are desirable for establishing a low melting flux during sintering but more than 2.2 mole percent glass-formers tends to reduce the dielectric constant.
Abstract: An anti-holiday cable armor for submersible electrical cables comprising two generally helically wrapped, overlapping metal straps, the second metal strap being wrapped longitudinally in a direction opposite to the direction of wrap on the first metal strap, for providing anti-holiday protection when the cable is pulled in either direction is disclosed.
Abstract: The specification describes a process for ion beam etching fine patterns in a substrate using a protected resist mask which prevents erosion of the mask. First, a resist pattern is formed on the surface of a substrate to expose pre-selected areas of the substrate. Next, a selected material is deposited on the resist mask at a predetermined controlled angle of incidence with respect to the surface of the mask to form a relatively thin protective layer on the resist mask, having edges and patterns replicated from the edges and patterns of the resist mask and a negligible amount of the selected material deposited on the exposed substrate. Then, a beam of ions at a chosen energy is directed through openings in the protected mask to the substrate to etch the pre-selected areas. During etching, the protective layer on the resist prevents erosion of the resist mask and provides improved pattern definition for the etched region.
Abstract: The invention relates to an elastomeric end piece intended for high voltage electric cables.By incorporating into the elastomer one or more substances whose electrical impedance reduces as a function of the voltage applied, such as silicium carbide, zinc oxide doped with cobalt or bismuth, the titanates or zirconates of alkaline or alkaline-earth metals, the distortion of the radial electric field at the end of the cable which could cause disruptive breakdown is avoided.Application to the end of high voltage electric cables, especially in polluted urban areas.
Abstract: An electron beam welding apparatus is provided with a magnetic shielding pipe for preventing electron beams emitted from being deflected by stray magnetic fields, and a removing device for removing metal deposit accumulated on a tip portion of the magnetic shielding pipe, which tip portion faces to a weld formed by welding of materials to be welded. The removing device is provided with at least a pair of shutters which move along a tip face of the tip portion to prevent the metal deposit from accumulating on the tip portion. The pair of shutters provides in their central portion a hole for passing electron beams therethrough when they are closed so that welding can continue irrespectively of the movement of the shutters.
Abstract: A seal plug for conduits is disclosed having a plug core including at least one radially-expansible seal member for sealing the conduit in which it is disposed, while permitting passage of cables or the like therethrough. Until required for the cable or cables, the passages in the seal plug are closed by removable pin inserts, retainer means being provided to hold the inserts in place. The plug includes longitudinal compression means to bring the seal member into sealing contact with the conduit wall. Each passage may open to the circumference of the respective seal member via slits to permit sideways insertion of the cable therein.
Abstract: The invention provides apparatus suitable for use in continuous transfer of workpieces through a region of reduced pressure in which some operation is to be performed on each workpiece in turn, being particularly, but not exclusively, suitable for electron beam welding. The apparatus comprises a sealed chamber, to constitute the region of reduced pressure, and a passageway extending therethrough, with means defining a series of compartments for containing individual workpieces, the compartments being movable in succession along the passageway and through an operating station in the sealed chamber where the interior of each compartment in turn is exposed to the interior of the sealed chamber for the performance of an operation on a workpiece carried in the compartment.
Abstract: High-cadmium silicates, namely 2CdO.SiO.sub.2, 5CdO.2SiO.sub.2 and 3CdO.SiO.sub.2, are employed as the flux in a dielectric ceramic precursor mixture. The characteristic melting temperature of these fluxes is greater than the maximum ceramic firing temperature employed in the present method. Nevertheless, liquid phase sintering is achieved when such cations as the alkaline earth metals or lead from the high firing ceramic precursors diffuses into the flux, displacing some of the cadmium and reducing the melting temperature of the flux below that of the firing temperature. Some of the cadmium from the flux is drawn into the grains to replace the lost barium and lead. Escape of cadmium into the atmosphere is thereby substantially prevented. This method is particularly effective when the dielectric ceramic is a barium lead titanate zirconate and when the amount of the flux is kept very small.
Abstract: A handle (12) is pivotally mounted on a support (11) and is connected to a potentiometer (21) by a linkage (24) for selectively varying the resistance of the potentiometer upon manipulation of the handle. The linkage includes a link (25) adjustably connected to the handle for varying the degree of relative movement between a housing (22) and rotary adjustment shaft (23) of the potentiometer to thus vary the range of resistance thereof in response to a same increment of movement of the handle. The linkage may include a hinge assembly (34) and a biasing spring (31) or the link may be connected to the adjustment shaft (23b) of the potentiometer directly.
Abstract: A method and apparatus for electron beam welding in which a single electron un is displaced from one welding position to another welding position. A welding chamber is positioned at each welding position, and all of the chambers are located under a buffer vacuum enclosure. Preferably each chamber is associated with an individual vacuum pump. During the time the welding gun is operated at one position, the welded pieces are discharged and a set of pieces to be welded is placed at another position.
September 18, 1978
Date of Patent:
February 17, 1981
La Soudure Autogene Francaise, Commissariat a l'Energie Atomique, L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude, Societe Chimique de la Grande Paroisse, Azote et Produits Chimiques
Abstract: Disclosed herein is a heating element for an air heater and the like comprising a ceramic material in the form of a honeycomb as well as the process for producing the ceramic material. The heating element is characterized by its relatively high amount of heat generation capability compared to a conventional heating element of the same size. Preferable ceramic materials for the heating element have a temperature coefficient of electrical resistance of from 5 to 20%/.degree.C., and consist essentially of from 38.7 to 47.3 molar % of BaO, from 2.5 to 11 molar % of PbO, from 49.8 to 50% of TiO.sub.2, from 0.05 to 0.3 molar % of a semiconductor forming element and from 0.002 to 0.015 part by weight of Mn.
Abstract: A multiple joint box or distribution sleeve having a tubular sleeve, which has a longitudinal slit with wedge-shaped sealing elements along the slit, and sealing members at both ends of the tubular sleeve characterized by each of the sealing members comprising a pair of rigid disks and at least one elastic circular plate interposed and clamped therebetween, the disks and plate each having a plurality of apertures aligned with each other to form cable inlets with the apertures of the elastic circular plate having a smaller diameter than the aperture of the rigid disks, and each of the disks being provided with a peripheral bevel coacting with each other to form a circular groove for receiving means for forming a peripheral seal.
July 24, 1978
Date of Patent:
December 2, 1980
Wolfgang Giebel, Herbert Krause, Hans-Juergen Meltsch
Abstract: An adaptor for placement at the terminus of an electrical power distribution cable having diametral dimensions falling within a given range of sizes, the cable being of the oil-filled type including a conductor, a paper insulator and a lead jacket, to seal the terminus and enable installation, in the field, of an electrical connector for use in an electrical power distribution system. The adaptor includes a sleeve portion of insulating material for placement over the cable insulation, a conductor-sealing portion for receiving the conductor of the cable, a jacket-sealing portion for juxtaposition with the lead jacket to seal the juncture between the lead jacket and the adaptor, a dielectric filler for placement between the cable insulation and the sleeve portion, and an electrical stress control member for controlling electrical stress along the interface between the cable insulation and the dielectric filler.
Abstract: An electrical cable accessory, such as a terminator or an electrical connector element, to be installed at the terminus of a shielded electrical cable using a lubricant to ease the installation has an opening for receiving the cable and a flared inlet passage through which the cable terminus passes, the configuration of the inlet passage permitting the lubricant to enter the opening during installation and assuring that the cable will be gripped appropriately within the opening upon completion of the installation.
Abstract: A feedthrough device is provided for sealing a supply line as it passes through an aperture in a wall member such, for example, as the housing of electrical apparatus. The device, which is generally tubular, comprises a first member which is radially inwardly deformable and can be pushed through the aperture and a second member which can telescopically engage the first member so as to co-operate with it to clamp against the wall member and provide a seal whilst at the same time preventing radial inward deformation of the first member. A recoverable sleeve member, which may be provided on, or be integral with, either of the first or second members engages the supply line to effect a seal therewith.
Abstract: An insulator with a tin oxide semiconductor glaze coating has a portion at least 100.mu. thick extending from the glaze surface in which the ratio of the maximum to the minimum volume resistivity is not more than 30. It is found that such glazes display marked improvement in resistance to deterioration under unfavorable conditions.
Abstract: A cable termination connector assembly for physically receiving and securely retaining the bared end of a current carrying center conductor of a high voltage power cable and for making an external electrical connection to the center conductor includes a multi-barrel connector for use with many different sizes of high voltage power cables. A plurality of elongated, generally axially extending apertures are formed in the connector for receiving the wire strands of a segmented or nonsegmented center conductor of a high voltage power cable. In a specific embodiment, the apertures are canted or inclined with respect to the longitudinal axis of the center conductor and the multi-barrel connector to minimize the length of cable insulation that is cut away or stripped back and thereby increase the dielectric strength or reduce the size of the termination assembly and facilitate insertion of the wire strands.
Abstract: A terminal is provided for introducing signals from an electrical terminal pin in a heart pacemaker to a terminal lead introduced into a patient's body. The terminal pin is disposed in a lid of the heart pacemaker so that the terminal pin is insulated from the lid. Means are also provided for introducing the signals on the terminal pin to the terminal lead without subjecting the pin to undue stresses.The terminal includes a hollow, electrically conductive ferrule disposed in concentric relationship with the terminal pin. The ferrule is provided with a flange which is disposed against the lid. An electrical filter is disposed in the ferrule and means are provided for maintaining the filter in fixed relationship to the ferrule and the terminal. Insulating means are provided for bonding the ferrule and the terminal. An inductance may also be included in the terminal and may be connected to the filter to enhance the filtering effect.