A drive system for raising or lowering a sliding piece of a current collector for rail vehicles. The sliding piece is disposed on a positioning device of the current collector, and the sliding piece is configured to be brought into contact with an overhead line using contact pressure. The drive system includes a bellows drive which is actuated by compressed air to actuate the positioning device, and a pneumatic control unit having a control valve for supplying or withdrawing compressed air to/from the bellows drive. The drive system includes a detection line and a lowering valve for venting the bellows drive when pressure drops in the detection line, the lowering valve being a 3/2-way valve disposed in a pneumatic supply line between the control valve and the bellows drive.

This rapid descent device comprises a valve comprising two chambers, at least one rub strip fastened to the body of the current-collector bow of the pantograph, intended to come into contact with the overhead wire and equipped with degradation detection circuit, at least one supply line of fluid to the main chamber of the valve, at least one feed line intended to feed this fluid to the pilot chamber of the valve, as well as at least one detection line extending from the pilot chamber of the valve, to feed a respective detection circuit. The rapid descent device comprises means for temporary shut out of the feeding of fluid of the main chamber, which reliably ensures the initial raising of the pantograph until the pantograph comes into contact with the overhead wire.

This rapid descent device comprises a valve comprising two chambers, at least one rub strip fastened to the body of the current-collector bow of the pantograph, intended to come into contact with the overhead wire and equipped with degradation detection circuit, at least one supply line of fluid to the main chamber of the valve, at least one feed line intended to feed this fluid to the pilot chamber of the valve, as well as at least one detection line extending from the pilot chamber of the valve, to feed a respective detection circuit. The rapid descent device comprises means for temporary shut out of the feeding of fluid of the main chamber, which reliably ensures the initial raising of the pantograph until the pantograph comes into contact with the overhead wire.

The invention relates to a contact unit and to a method for steering electric arcs on a contact unit, in particular for supplying vehicles with power via an overhead wire (20), the contact unit comprising a sliding contact device (19), the sliding contact device having a contact strip support (21) and a contact strip (22) disposed thereon, the contact unit having a steering device (24) for electric arcs (25) which is disposed on the contact unit, the steering device being provided with a magnet (30).

A frangible shunt link assembly includes a frangible link configured to conductively couple a current collector coupled with a vehicle and one or more components of the vehicle. The frangible link is configured to break responsive to the current collector being at least partially separated from the vehicle to interrupt a conductive connection between the current collector and the one or more components of the vehicle.

A frangible shunt link assembly includes a frangible link configured to conductively couple a current collector coupled with a vehicle and one or more components of the vehicle. The frangible link is configured to break responsive to the current collector being at least partially separated from the vehicle to interrupt a conductive connection between the current collector and the one or more components of the vehicle.

A fluid machine includes a rotary blade, a casing configured to house the rotary blade therein, and an insulation coated conductor attached within a recess circumferentially provided in an inner circumference of the casing opposed to an outer end of the rotary blade, the insulation coated conductor including a conductive wire and an insulation material coating. The dielectric barrier discharge is generated between the insulation coated conductor and the outer end of the rotary blade by applying a pulse voltage between the conductive wire and the rotary blade, so as to prevent leakage of operative fluid through a tip clearance between the inner circumference of the casing and the outer end of the rotary blade.

A fluid machine includes a rotary blade, a casing configured to house the rotary blade therein, and an insulation coated conductor attached within a recess circumferentially provided in an inner circumference of the casing opposed to an outer end of the rotary blade, the insulation coated conductor including a conductive wire and an insulation material coating. The dielectric barrier discharge is generated between the insulation coated conductor and the outer end of the rotary blade by applying a pulse voltage between the conductive wire and the rotary blade, so as to prevent leakage of operative fluid through a tip clearance between the inner circumference of the casing and the outer end of the rotary blade.

A device (100) for transmitting an electrical current between two elements that are movable relative to each other, by a strip (30) containing carbon, which extends in a longitudinal direction and is designed to rub against one of the elements so as to transmit an electrical current, the transmission device including: a strip holder (6), and bearing structure (10) designed to exert force on the strip (30), which urges same against the holder (6), the force being transverse relative to the longitudinal direction, wherein the bearing structure (10) and/or the holder (6) are shaped so as to occupy only a portion of the length of the strip (30) in the longitudinal direction.

An assembly includes a locomotive, equipped with a roof line, electrically connected to a pantograph, a control system and a sensing circuit. The control system orders, depending on the voltage on the roof line detected by the sensing circuit, the open or closed state of a switch between the roof line and a power supply circuit of the motors of the locomotive. The assembly also includes a tender, coupled to the locomotive and carrying batteries suitable for delivering a current for supplying the motors. The tender is electrically connected to the locomotive in such a way that a first terminal of the batteries is connected to the roof line and a second terminal of the batteries is connected to a point of the locomotive set to a reference potential.