Abstract: A method for etching a selected area of a conductive metal oxide layer deposited on a support is provided. The method comprises removing the area via electrochemical route in the presence of a polarized microelectrode and an electrochemical solution. In addition, an etched layer obtained with the foregoing method is provided.

Abstract: A printed wiring board has a packaging substrate having multiple pads, and a transmission substrate mounted on the multiple pads of the packaging substrate. The packaging substrate has a pad group constituted of pads which mount an electronic component, the multiple pads mounting the transmission substrate includes a first pad positioned in a peripheral portion of the packaging substrate and a second pad positioned between the first pad and the pad group, the second pad is electrically connected to a signal pad of the pads in the pad group, and the transmission substrate includes a horizontal wiring which electrically connects the second pad and the first pad and which transmits a signal between the second pad and the first pad.

Abstract: A layered body which includes a porous layer. The layered body having improved properties, such as adhesion between its substrate and its porous layer by the formation of a crosslinked structure; a functional laminate using the porous layer layered body; and a production processes thereof. The layered body includes a base and the porous layer on at least one surface of the base. The base is a resin film made of at least one resin material of polyimide resins, polyamideimide resins, polyamide resins, and polyetherimide resins, or is a metal foil piece, and the porous layer is made of a composition containing at least one polymer of polyimide resins, polyamideimide resins, polyamide resins, and polyetherimide resins as a main component, and a crosslinking agent. Additionally, the porous layer has fine pores having an average pore diameter of 0.01 to 10 ?m, and a porosity of 30 to 85%.

Abstract: Provided is a resin composition for an adhesive comprising a polyurethane resin containing a carboxyl group, having specific range of an acid value having specific range of a number average molecular weight and having specific range of a glass transition temperature a polyester resin having specific range of a number average molecular weight and having specific range of a glass transition temperature; an epoxy resin containing a nitrogen atom; and an epoxy resin having a dicyclopentadiene skeleton, in which a content rate of the polyurethane resin to a sum of the polyurethane resin and the polyester resin is 70 to 95 percent by mass, a content rate of the total epoxy resin contained in the resin composition to the sum of the polyurethane resin and the polyester resin is 5 to 30 percent by mass.

Abstract: A circuit module includes a substrate that has a substantially rectangular parallelepiped shape and includes a plurality of inner conductive layers, an electronic component disposed on a first main surface of the substrate, an insulating layer disposed on the first main surface of the substrate so as to cover the electronic component, a shielding layer disposed on a surface of the insulating layer, and a ground electrode connected to the plurality of inner conductive layers. At least two of the inner conductive layers are directly connected to the shielding layer.

Abstract: A wiring board has a laminated structure having a recessed portion on a first-surface side of the laminated structure and a solder resist layer on a second-surface side of the laminated structure on the opposite side of the first-surface side. The laminated structure has a first-surface side pad formed in the bottom of the recessed portion and a second-surface side pad formed on the second-surface side of the laminated structure, the solder resist layer has a first opening portion and a second opening portion formed in the solder resist layer, the first opening portion is exposing the second-surface side pad, the second opening portion is formed on a back face of the recessed portion, and the back face of the recessed portion does not include the second-surface side pad.

Abstract: A substrate is provided that includes a plurality of substrate layers and a plural diameter via having a first via portion and a second via portion. The first via portion is formed in a first substrate layer, has a first diameter, and extends along a first axis. The second via portion is formed in a second substrate layer, has a second diameter that is different than the first diameter of the first via portion, and extends along a second axis that is offset from the first axis of the first via portion. Optionally, the first via portion and the second via portion may have a common edge that is spaced the same distance from an edge of another via extending through the substrate.

Abstract: A cable bundling structure is provided for being set in slidable engagement with a target cable. The cable bundling structure includes a helical wrap member, which wraps around a wrapped section of the target cable. The helical wrap member is selectively composed of one or more sections of wrapping turns and each section is made in a one-piece form having a predetermined wrap width, a predetermined helix angle, and a predetermined wrap diameter and extending a predetermined length in a wrapping direction. The helical wrap member helically wraps around the target cable in such a way that the helical wrap member is in slidable engagement with the target cable and serves as an external protection for the cable.

Abstract: A cable clamp for securing an electrical cable to a support structure has two substantially similar half-shells, each half-shell including a concave inner surface terminating in a pair of abutting surfaces. The half-shells further include a pair of winged flanges offset a distance from the abutting surfaces. The lower half-shell can first be secured to a support structure using a pair of elongate members passing through the winged flanges of the lower half-shell and a plurality of fastening members. A cable can then be placed within a cable receiving region of the lower half-shell and the top half-shell can be secured to the lower half-shell, applying a clamping force to the cable without interference from the fastening members used to secure the lower half-shell to the support structure.

Abstract: A cable gland (1) has a screw sleeve (2) which can be inserted into a wall or a pipe coupling and has an external thread, and has a union nut (3) which interacts with the external thread of the screw sleeve (2). The union nut (3) can be used, by virtue of being tightened, to press a clamping insert (5) against a cable (4) which is to be retained, wherein the cable (4) has a reinforcement means (7) which is exposed at least at points or is free within the cable gland (1). A clamping device (8) for clamping a portion of this reinforcement means (7) is provided in the cable gland (1), the clamping device (8) partially engaging in the inner opening in the screw sleeve (2) in the axial direction in the use position and being directly or indirectly acted on by the union nut (3) outside the screw sleeve (2).

Abstract: A predetermined part of electric wires (91) is held or wrapped in a first material (801) and a second material (802) formed of a thermoplastic material, and a protective layer material (803) formed of a water repellent material is provided on approximately the entire surface of the first material and the second material. The first material (801), the second material (802) and the protective layer material (803) are heated and pressurized. The first material (801) and the second material (802) are molded to have a predetermined shape and size. The protective layer material (803) is joined to the surface of the first material and the second material (802) by melting at least a part of the surface layer of the first material (801) and the second material (802). Further, a material having high abrasion resistance is selected as the protective layer material (803).

Abstract: Power supply systems and methods for their use in computer systems. The systems and methods make use of a power supply unit to which a main power cable and multiple cable stubs are electrically connected. The power cable is adapted to provide power to a motherboard of a computer system, and the multiple cable stubs are adapted to provide power to peripheral devices within the computer system. At least two of the cable stubs have different lengths. Each of the cable stubs has a device-specific female connector configured to mate with a specific class of the peripheral devices. The power supply system further includes at least one extension cable adapted to connect to the device-specific female connector of at least one of the cable stubs to allow extension of the cable stub or to power more than one of the peripheral devices.

Abstract: Provided herein is a connecting strap or spanning strap that is adapted for use in interconnecting adjacent insulated and/or electrically isolated pipeline sections to provide electrical continuity. Various aspects of the spanning strap are based on the realization that different attachment mechanisms may benefit from differing geometries of the spanning strap. Specifically, it's been determined that the geometry of an attachment aperture extending through the connection strap for use in welding or soldering strapped an underlying surface may be advantageously designed.

Abstract: A system for the thermal conditioning of a fluid, more particularly of a drilling mud, in preparation for subsequent cycles of analysis of the composition of said fluid is disclosed, wherein the system provides for the presence of at least one generator of microwaves for the heating of said fluid and a cylinder of non-stick material wherein said fluid flows; said system and method being such that the heating of said mud takes place in less than 70 seconds.

Abstract: Methods allowing precise directional drilling are provided. Such methods include use of directional drilling equipment which include a drill string with a hollow bottom rod connected to a boring tool by means of an obtuse-angle connection piece or “bent sub”. In order to restore the verticality of the drilling a vertical borehole section (F) is formed and then a probe equipped with an inclinometer is lowered inside the bottom rod. The string may be rotated into four angular positions and the inclination values of the probe in each angular position are detected at the depth reached. The string is rotated so as to bring it into an angular position corresponding to the maximum inclination value detected. The string is moved so as to move the boring tool further downwards and the inclination of the probe is detected again in order to check that verticality has been reached.

Abstract: In one aspect, a method of making a drill bit is disclosed that includes selecting a drill bit configuration, obtaining a stress map for the drill bit configuration relating to a drilling operation, performing a mechanical test with an actual drill bit having the selected configuration, and selecting a location on a surface of the drill bit for installing a sensor thereat based on a location of low stress from the stress map and results of the mechanical test, and placing a sensor at the selected location.

Abstract: The invention is a method of developing a petroleum reservoir employing a technique for selection of the position of the wells to be drilled. A production indicator map is utilized comprising a set of cells each associated with a production indicator defining impact on fluid production of addition of a well in this cell. The production indicator map is constructed by selecting cells from among the set of cells of the map; determining production indicators in the selected cells; and interpolating the production indicators on the set of cells of the map, by an interpolation model accounting for a distance between the cell to be interpolated and the closest well to the cell to be interpolated. The position of the well to be drilled is defined by the cell where the production indicator is a maximum.

Abstract: In aspects, the disclosure provides a drilling motor that includes a lubricating unit that selectively supplies a lubricant to the drilling fluid before the drilling fluid passes through the drilling motor so as to lubricate the stator and/or the rotor to reduce friction between the stator and the rotor and to reduce wear of the motor.

Abstract: A method of prolonging the life of a PDC cutter having a substantially cylindrical shape centered about a rotational axis, and an apparatus for multi-axis modulation of a PDC cutter, the method including imparting linear modulation to the cutter in at least one direction and imparting rotary modulation to the cutter about the rotational axis, the rotary modulation being synchronized with, and facilitated by, the linear modulation.

Abstract: A drill bit has a plurality of blades that include a coring blade, a plurality of flow courses that include an evacuation slot disposed between the plurality of blades, and a conical insert disposed on or proximate a bit centerline of the drill bit. Coring blade includes a first cutting element disposed at a first radial position from the bit centerline. Also, coring blade includes a substantially vertical surface and an angled surface. During drilling, first cutting element cuts formation to generate a core sample fragment at bit centerline. Core sample fragment is then broken away from formation using angled surface or conical insert after core sample fragment reaches a certain length. Core sample fragment then exits drill bit via an evacuation slot, from where core sample fragment is transported via an annulus to the surface of formation for testing and analysis.

Abstract: A drill tool includes a cone mounted for rotation on a bearing shaft that extends from a bit head. The cone has a first planar base surface opposed to a second planar base surface of the bit head. A first annular groove is formed in the first planar base surface, and a second annular groove is formed in the second planar base surface. The first and second annular grooves are at least partially aligned with each other. The combination of the first and second annular grooves form a first annular gland. A protector ring is inserted into the first annular gland, and functions to divide a fluid path between the bearing shaft of the drill tool and an external environment into a plurality of parallel fluid paths that pass around the protector ring. Each parallel fluid path includes a convolution defined by a plurality of fluid direction changing corners.

Abstract: A hardmetal composition comprises tungsten carbide in an amount greater than 50 weight percent of the hardmetal composition. In addition, the hardmetal composition comprises a binder material consisting of at least 90 weight percent nickel, a binder flux between 3.5 to 10.0 weight percent chosen from the group consisting of boron and silicon, and less than 1.0 weight percent other components.

Abstract: A weight measuring device includes a first link coupled to one end of a load to be measured. A second link is coupled to another end of a load to be measured. The first and second links include respective sections of a housing configured to place a spring in increasing compression with respect to increasing load on the first and second links. A hall cell and magnet are coupled between the first and second links to enable relative movement therebetween. The hall cell generates a signal related to an amount of movement of the first link with respect to the second link.

Abstract: A grain cart capable of self-propulsion and receiving steering and propulsion inputs from a lateral extendable connector to a tractor for the grain cart so that the grain cart may be deployed close to the central chassis of a combine for unloading of grain.

Abstract: Provided is a mounting structure for a battery in an electric vehicle capable of increasing a driving distance of the electric vehicle by mounting a plurality of battery modules in an existing vehicle body of en electric vehicle. The mounting structure for a battery in an electric vehicle according to an exemplary embodiment of the present invention includes a main relay box electrically connected with an inverter, a plurality of first battery modules mounted beneath the rear seats of the electric vehicle, and a main housing positioned between a pair of front seats in the electric vehicle and below the rear seat. More specifically, the main housing is configured to house the main relay box and first battery modules therein, and is fixed to the vehicle body of the electric vehicle.

Abstract: A fixing device for releasable fixing an electrical energy accumulator to a carrying structure of a motor vehicle includes at least one insertion bolt and a receiver unit for the insertion bolt which are provided on the carrying structure and on the energy accumulator (or vice versa). The insertion bolt includes a retaining protrusion and the receiver unit includes a cage and a locking element mounted in the cage. The cage includes an insertion opening into which the insertion bolt can be introduced along an insertion direction, and the locking element can be moved between a release position and a locked position. In the release position, the locking element opens the insertion opening for introduction of the insertion bolt and in the locked position engages behind the retaining protrusion of the insertion bolt when the insertion bolt is introduced in the insertion opening of the cage.

Abstract: An active hood system for a vehicle allows a user to easily restore the positions of an actuator and a hood with little force after a pedestrian collision. The active hood system includes: a hinge assembly mounted at rear sides of a hood; and an actuator for supporting the hinge assembly and lifting the hinge assembly as well as lifting the hood through the hinge assembly. The active hood system further includes a restoration link, wherein its top and bottom ends are hinged to a hinge arm of the hinge assembly fixed to the hood, and to a fixing point of the actuator, respectively, so the restoration link is rotated in cooperation with the hood, and wherein when the hood is pressed downward to restore the actuator and the hood, the restoration link is rotated such that the restoration link reduces the force required for restoring the actuator and hood.

Abstract: A cargo scooter is described having at least one front riding wheel, at least one rear riding wheel, a deck, and a cargo box. The cargo box has a floor that is located between the steering column and the at least one riding wheel. All of the riding wheels are aligned with each other.

Abstract: A saddle riding vehicle includes a vehicle body frame, a front wheel, a rear wheel, a power unit, a shift actuator, and an actuator guard. The power unit has a transmission and a shift mechanism for the transmission. The shift actuator is to actuate the shift mechanism and is attached to a lower portion of a side face of the power unit. The actuator guard is to protect the shift actuator from an obstacle and includes a guard frame and a guard member. The guard frame extends in a forward and backward direction of the saddle riding vehicle below the shift actuator. The guard frame is connected to the vehicle body frame. The guard member is connected to the guard frame and covers a lower face and an outer side face of the shift actuator.

Abstract: A system comprising a tractor vehicle, at least one trailer vehicle and a skin between and in contact with the tractor and trailer vehicles. One of the vehicles is disposed in a non-inverted position above the skin and the other is inverted and below the skin. The trailer vehicle comprises one or more magnets, while the tractor vehicle comprises one or more magnets magnetically coupled to each opposing magnet on the trailer vehicle. The vehicles may have mutually opposing permanent magnets in one-to-one relationship. Alternatively, each permanent magnet on the trailer vehicle could be opposed by one or more electro-permanent magnets on the tractor vehicle. The system further comprises means for maintaining the magnetic attraction force within a range as the vehicles move along a portion of the skin having a varying thickness.

Abstract: A receiver for towing is coupled to a vehicle that includes a frame, a rear axle, and a suspension system that couples the rear axle to the frame. The receiver including a body that defines a cavity sized to receive a towing attachment, and a suspension mount rigidly coupled to the body. At least a portion of the suspension system mounted to and supported by the suspension mount.

Abstract: A muffler device for a refrigerant circuit with refrigerant containing refrigerant oil comprises a housing in which an upper muffler chamber and a lower muffler chamber are arranged, whereby the upper muffler chamber has an upper feed opening that can be connected to the refrigerant circuit, and the lower muffler chamber has a lower discharge opening that can be connected to the refrigerant circuit, and whereby a muffler partition is arranged between the upper and lower muffler chambers, said partition having at least one muffling pipe that connects the upper muffler chamber to the lower muffler chamber, and an upper section of said pipe with an upper opening projects into the upper muffler chamber, whereby, at a filling level that exceeds the height of the upper opening, refrigerant oil that has accumulated on the top of the muffler partition can be fed with refrigerant vapor to the lower muffler chamber.

Abstract: A tunable muffler for a vehicle may include a center frame having a first cavity, a detachable connected base plate being detachably connected to the center frame and a tunable baffle to tune the muffler. The center frame may include a second cavity, and the tunable baffle may be mounted substantially 90° to the plane of the base plate. The baffle may be mounted substantially parallel to the plane of the base plate, and the baffle may be controlled by a control device.

Abstract: Disclosed is a partition panel capable of improving sound insulation performance and optimizing a reverberation time. The partition panel has sound absorption and insulation functions, comprising: a front plate having a perforated section with a plurality of through-holes and an entirely-continuous peripheral edge portion located outside the perforated section; an entirely-continuous back plate disposed on a side opposite to a sound source across the front plate; an inner perforated plate disposed between the perforated section of the front plate and the back plate; a front-side honeycomb core interposed between the perforated section and the inner perforated plate; a back-side honeycomb core interposed between the back plate and the inner perforated plate; and a peripheral honeycomb core interposed between the peripheral edge portion of the front plate and a region of the back plate opposed to the peripheral edge portion.

Abstract: An improved fall arrest lanyard apparatus and method for decelerating and arresting a user from impacting the ground after a fall, along with an integrated, deployable etrier. After the fall sequence has ended, the user may use the etrier to relieve tension in an upper portion of the lanyard and thereby disconnect the lanyard from the user while suspended.

Abstract: The object of the invention is an arrangement for damping lateral sways of a rope-like means fixed to an elevator car in an elevator hoistway, the bottom end of which rope-like means comprises an upward opening bottom loop. A detachable damping means producing a mass effect is disposed to be supported by the top surface of the bottom loop.

Abstract: A brake block for bicycle includes a base which is made by plastic injection molding and a pad body made of rubber. The base has a fixing portion formed on one side thereof and a connecting portion formed on another side thereof. The connecting portion is connected with the fixing portion. The connecting portion has a plurality of necks connecting with the fixing portion and a connecting plate which is mounted on the necks. A gap is defined in two adjacent necks. The pad body has a braking portion formed on another side thereof for providing frictional effect. The pad body is partially filled into the gaps of the connecting portion of the base. The necks and the connecting plate are thoroughly covered by the pad body so that the base and the pad body form as an integral part.

Abstract: A bicycle brake arm basically has a first branch and a second branch. The first branch includes a cable attachment structure. The second branch extends from the first branch. The second branch includes a brake shoe attachment structure. At least one of the first and second branches includes an interior cavity. The at least one of the first and second branches has a transverse cross-section in which the interior cavity is completely and continuously surrounded by an exterior surface of the bicycle brake arm.

Abstract: The invention relates to a selection of components of a disc brake, in particular for commercial vehicles, having a brake caliper having an installation opening for installing a brake shaft, a first brake shaft and a second brake shaft, wherein the two brake shafts are coordinated with the brake caliper in such a manner that they can be used to apply the brake. According to the invention, the first brake shaft, but not the second, fits through the installation opening. The further invention relates to a disc brake, in particular for commercial vehicles, having a brake shaft and a brake caliper having an installation opening for installing the brake shaft, wherein the brake shaft is coordinated with the brake caliper in such a manner that said brake shaft can be used to apply the brake. According to the invention, the brake caliper and the brake shaft each have a coding, which allows installation of the brake shaft through the installation opening only if the two codings match.

Abstract: A brake device includes a first member having holders, each of the holder configured to be in contact with a corresponding rolling body and hold the rolling body rotatably; a second member provided in contact with the rolling body and configured to rotate the rolling body in the holder according to a relative displacement with the first member; and a pressing mechanism configured to press the first member and the second member against each other. This makes it possible appropriately to set performance regardless of, for example, a projecting area of a surface of the first member, the surface being pressed by the second member.

Abstract: Brake caliper bodies and brake calipers for disc brakes are provided.

Abstract: A locking apparatus for a parking brake includes a parking lever, a parking lever spring applying a restoring force to the parking lever, a cylinder of which an oil hole is formed thereto, a piston comprising a piston rod connected to the parking lever and a piston main body disposed within the cylinder, and the piston movable along length direction of the cylinder according to supplying or releasing of oil through the oil hole, a solenoid valve and a locking unit disposed within the cylinder for unlocking the piston when the solenoid valve is supplied electric power and for locking the piston when the solenoid valve is not supplied electric power.

Abstract: A passive inert gas braking apparatus, system and method for braking a flywheel rotating within an electromechanical battery (EMB) system includes an electro-mechanical battery arrangement having a containment vessel containing a flywheel, a compressed gas storage arrangement to store compressed gas, a gas expansion arrangement to receive gas from the vessel, which is coupled to the storage arrangement, in which the vessel is coupled to the gas expansion arrangement, and in which the gas expansion arrangement is coupled to the compressor arrangement. Also described is a method for braking a flywheel rotating in an electromechanical battery (EMB) system by providing a compressed gas to an electro-mechanical battery arrangement having a containment vessel containing a rotating flywheel to slow the rotating flywheel, and after the flywheel has at least slowed because of the gas in the containment vessel, returning heated gas from the containment vessel to a gas expansion arrangement.

Abstract: A valve structure includes a piston valve assembly, and a frequency unit including a hollow housing, a free piston and an auxiliary valve assembly. The piston valve assembly, installed at one end of a piston rod, operates with the inside of a cylinder being divided into upper and lower chambers, and generates a damping force varying according to a moving speed. The frequency unit moves together with the piston valve assembly and generates a damping force varying according to a frequency. The housing is mounted at a lower end of the piston rod such that the housing is disposed under the piston valve assembly. An inner space of the housing is partitioned into upper and lower spaces by the free piston. The free piston is disposed to be vertically movable within the housing. The auxiliary valve assembly is mounted at a lower end of the housing.

Abstract: A shock absorber includes a valve assembly which includes a valve disc engaging an inner and outer valve land defined by a valve body. The inner valve land is a non-circular valve land such that a radial dimension between the inner and outer valve land varies based upon a circumferential position of the radial dimension. The varying radial dimension provides a progressive valve opening for the valve assembly.

Abstract: An expandable multi-compartment luggage having a second luggage bag hingeably attached to the first luggage bag. The second luggage bag having an upper portion and a collapsible lower portion. The collapsible lower portion being moveable between a collapsed position to an expanded position defining a lower interior compartment. The luggage also including a dividing wall disposed between the upper and lower portions of the second luggage bag, and which is movable from a closed position dividing the upper interior compartment of the second luggage bag and the lower interior compartment of the second luggage bag and an open position with the upper interior compartment of the second luggage bag being in communication with the lower interior compartment of the second luggage bag.

Abstract: A power supply and acquisition apparatus for an electrical vehicle includes a power supply device embedded along a road and a power acquisition device attached on the vehicle. The power supply device includes a plurality of power supply core units, each core unit having two opposite magnetic poles and formed in a direction perpendicular to a longitudinal direction of the road; and one or more power supply lines disposed along the longitudinal direction such that adjacent two magnetic poles have different polarities. The power acquisition device includes power acquisition core units; a connection member for connecting the power acquisition core units such that the power acquisition core units are spaced from each other by a distance between the magnetic poles; and a power acquisition coil wound around the respective power acquisition core units or the connection member.

Abstract: Contact means (4) related to a vehicle are adapted to comprise an elongated arm (50), one end portion (50a) of which is rotatably attached to the underside (bottom) of the vehicle (1) and the other end portion (50b) of which is adapted to support said contact means (4). One or more sensors (151a, 151b) are disposed at the vehicle (1) and are intended to be able to sense the presence of and the orientation of a track or groove (51) and transfer sensed information to a power control circuit (100), which is adapted to comprise a control circuit (100b), which when sensing the existence of and a sensed orientation of at rack or groove (51), within a covered and restricted area, is to be adapted to actuate means (7) adapted to a sidewise movement and/or a lowering (or raising) movement at the contact means (4).

Abstract: This invention comprises an arrangement for overload restriction, adapted to cooperate with a system (“S) for an electric and by one or more batteries or “a” battery set driven vehicle (1) to be driven along a stretch of roadway, comprising a one or more over an individual electric motor or motors drivable vehicles (1), with said respective vehicles (1) exhibiting a control circuit (100, “R1”) controlling the power for creating the necessary power and/or speed control, wherein a necessary power i.a. can be supplied primarily by a chargeable battery set (“B”) allotted to the vehicle, and “b” a plurality of a roadway sections (2a1) sub-dividing the stretch of road, each one allotted to one or more electric stations (“s1”, “III”) for thereby charging the battery set (“II”; B) of the vehicle and/or supplying the necessary power and energy for driving the vehicle.

Abstract: This invention concerns a rail structure (70, 71, 72, 73) in a vehicle-related system (S) for driving an electric and by one or more batteries conveyable vehicle (1) along a stretch of a track in a roadway section (2a1) and related to a roadway, comprising (a?) by one or more individual electric motors (5) drivable vehicles (1), and “b” a plurality of roadway sections (2a1, 2a) which may subdivide the stretch of roadway. Said tracks (51, 52) are in a cross section oriented in parallel in a rail structure (70), said rail structure (70) having external, of metal made, wall sections (71, 72) and a partition (73) separating the external wall sections. A first conductor surface ( ), which may be subjected to voltage, is allotted a lower portion for a first track (51). A second conductor surface (4b), which may be subjected to voltage, is allotted a lower portion for a second track (52).