Abstract: A machine lays a bituminous carpet for closing microtrenches. The machine includes a truck having a drive system, which defines a footprint area on a surface whereon the truck can move, and a preparing device for preparing bitumen for laying. The preparing device includes a bitumen container having an inlet into which bitumen in introduced, an outlet through which the bitumen prepared for laying exits, a heating system for raising the temperature of the bitumen introduced into the preparing device. A laying device receives the bitumen prepared for laying and lays the bitumen in carpet form. The laying device includes a forming element for shaping and laying bitumen as a carpet over a laying area; a drain channel, between the outlet of the preparing device and the forming element, conducting bitumen towards the forming element. The preparing device includes a mixing device mixing the bitumen while preparing it for laying.

Abstract: An apparatus for determining the state of occupation of a track circuit on a railway line provided with a plurality of track circuits adjacent to one another, said circuit comprising a pair of rails (R) formed by parallel metal sectional elements between which it is possible to apply a voltage, each track circuit being separated from the adjacent stretch via electrically insulating joints (G). Said apparatus comprises a transmission block (2) capable of transmitting to the track circuit an a.c. voltage signal, associated to which is a predetermined sequence of at least three codewords that are different from one another.

Abstract: A system for the protection of an electric line for railway signals that comprises a computerized central apparatus (ACC) connected to a plurality of peripheral posts (PP). Each peripheral post comprises at least one plant-controller electronic card (CdE), which controls a plurality of plant-interface cards (IE) that supply the plants (E) directly, via a field bus (B1), on the basis of the commands received from the plant controller and acquire the control signals from the field sensors, transferring them to the controller.

Abstract: An apparatus for determining the state of occupation of a track circuit on a railway line provided with a plurality of track circuits adjacent to one another, said circuit comprising a pair of rails (R) formed by parallel metal sectional elements between which it is possible to apply a voltage, each track circuit being separated from the adjacent stretch via electrically insulating joints (G). Said apparatus comprises a transmission block (2) capable of transmitting to the track circuit an a.c. voltage signal, associated to which is a predetermined sequence of at least three codewords that are different from one another.

Abstract: An apparatus for supplying a track circuit in a railway line provided with a plurality of track circuits adjacent to one another and electrically insulated from one another. Said circuit comprises a pair of rails (R) formed by parallel metal bars (B) and a transmission block (2), capable of supplying the track circuit via a voltage generator designed to cause a current to flow in the circuit, it being possible for information to be associated to said current signal via a predetermined code. Said current delivered and absorbed by the circuit is detectable by a detection device provided on board a train that is travelling along that track circuit.

Abstract: A system for the protection of an electric line for railway signals that comprises a computerized central apparatus (ACC) connected to a plurality of peripheral posts (PP). Each peripheral post comprises at least one plant-controller electronic card (CdE), which controls a plurality of plant-interface cards (IE) that supply the plants (E) directly, via a field bus (B1), on the basis of the commands received from the plant controller and acquire the control signals from the field sensors, transferring them to the controller.

Abstract: An optical filter comprising two ferrules containing a respective duct internally housing a respective portion of optical fibre; the two ferrules are inserted axially aligned within an alignment bush, between said two ferrules there being inserted a vitreous support on which a layer of optically active filtering material is deposited. A method for constructing said optical filter is also described.

Abstract: An optical filter comprising two ferrules containing a respective duct internally housing a respective portion of optical fibre; the two ferrules are inserted axially aligned within an alignment bush, between said two ferrules there being inserted a vitreous support on which a layer of optically active filtering material is deposited. A method for constructing said optical filter is also described.

Abstract: The method for butt-coupling an optical fibre connector comprising a cylindrical ferrule consists of the following steps:a) preparing the head of the optical fibre for insertion into the ferrule;b) applying a thin layer of resin to the fibre, taking care not to soil the cut end of the fibre with said resin;c) inserting said fibre into the sized hole of the cylindrical ferrule;d) by means of an alignment bush, coupling said ferrule to a reference ferrule in which a piece of fibre has been previously housed and fixed such that the end surface of said fibre lies inward of the end surface of the reference ferrule;e) crosslinking the resin.

Abstract: A multi-fibre connector consisting of a bush acting as a guide and coupling element for two ferrules, which are located one in front of the other and contain a sized hole in which two or more fibres are located in a radial arrangement, said two or more fibres being inserted and glued into the sized hole, after which the entire end surface of the ferrule and fibres is lapped in such a manner as to obtain a convex and/or angled surface. Means are provided for securely coupling together said ferrules and said bush. Said means are in the form of a longitudinal slit provided in the bush and a respective shaped insertion element rigidly fixed to a respective one of the facing end parts of said two ferrules, said shaped insertion element engaging in said slit.

Abstract: A multiple connector for multi-fibre optic ribbons, comprising two facing plugs snap-insertable into a coupling consisting of a plurality of bushes locked together by a locking device, each of the plugs comprising a butting chamber and a plurality of ferrules complete with a support socket and a helical spring. The butting chamber, containing a plurality of individual optical fibres, also has a snap-cover and is fixed to a protection shell through which a multi-fibre ribbon is inserted.

Abstract: In order to fabricate strip monomode active optical waveguides for optical elecommunications, a layer of vitreous soot is deposited on a substrate and is impregnated with a solution of a precursor of a rare-earth dopant, and a radiation with a wavelength comprised in an absorption band of the dopant is moved along the soot, along a trajectory corresponding to the geometrical shape desired for the guide, thereby forming a vitrified strip.

Abstract: An hermetically sealed joint cover for fibre optic cables which does not require the use of mastic and/or miscellaneous sealants, the hermetic seal being achieved by a seal gasket which is provided with at least one through hole partly open outwards and embracing each cable or series of cables entering and/or leaving the joint cover, and which is insertable into seats formed in apertures for the entry and exit of the cables into and from the joint cover.

Abstract: In order to fabricate strip monomode active optical waveguides for optical telecommunications, a layer of vitreous soot is deposited on the interior of a tubular substrate and is impregnated with a solution of a precursor of a rare-earth dopant, and a radiation with a wavelength comprised in an absorption band of the dopant is moved along the soot, along a trajectory corresponding to the geometrical shape desired for the guide, thereby forming a vitrified strip.

Abstract: A branching device for fibre-optic cables, consisting essentially of two half-casings which can be joined together and contain means for connection to a multi-fibre/fibre-optic unit and means for connection to a plurality of single-fibre/fibre-optic units, the half-casings being shaped to form a cavity arranged to contain a plurality of optical fibres, the cavity being of essentially annular shape and having a width greater than the thickness determined by the plurality of separate optical fibres within the device, the optical fibres within the branching device which connect together the means for connection to a multi-fibre/fibre-optic unit and the means for connection to a plurality of single-fibre/fibre-optic units having a length greater than the length of the minimum development of the annular cavity.

Abstract: In a connector for fibre optic cables a female element with which a first terminal element of a fibre optic cable is associated and a male element with which there is associated a first sleeve into which a second terminal element is inserted, the female element being of the type which can be associated with a fixed assembly and comprising a base and a flanged sleeve free to position itself relative to the base by moving only in a plane perpendicular to the jointing axis of the connector. Any rotation of the flanged sleeve about the connector jointing axis or about axes parallel thereto is prevented; the male element consists of a hollow body closed by a flanged tubular element and provided with a bored end plate, the male element receiving the first sleeve in such a manner as to prevent its rotation and also receiving elastic means engaged with the end plate and with the first sleeve, the tubular element being lockably insertable into the female element.

Abstract: The connector (20) for optical fiber conductors is of the type used in order to connect two conductors (3) respectively leading to a fixed unit and to a mobile unit with each other. The connector (20) comprises a male element (21) and a female element (22) which unite with each other by a spring-like coupling along the axis of connection (15) of the connector. The female element (22) comprises a sleeve portion (25) and is free of performing translational movements on a perpendicular plane relatively to the axis of connection (15), but is not free to rotate around the axis.

Abstract: Integrated optical guides are fabricated on fluoride glass plates by expog such plates to an atmosphere of a gaseous halogen other than fluorine, or of a compound capable of generating such a halogen, at high temperature and pressure, so as to obtain a ion exchange between fluoride ions in the glass and halide ions.