Patent Application
20230018186
The subject of the invention is a pantograph carriage intended for mobile, continuous transfer of electricity from a flexible cable to an electric receiver, for example, a gantry crane, a trolleybus or another vehicle, simultaneously ensuring small offset resistance and secure electric coupling. The carriage according to the invention guarantees safe contact power supply of mobile electric receivers moving along designated routes, for example, buses (trolleybuses), suspended and cable transport carriages, loaders in mines, automatic systems for crop handling and harvest in agriculture, self-propelled cranes, gantry cranes, transport carriages, etc., also under field conditions and in temporary use, for example, at construction sites or on agricultural fields and in orchards.
The commonly used system of contact-based, wired power supply for vehicles, such as tramways, railway engines, trolley buses, metro usually takes place using top, uninsulated power lines, from which power is drawn using pantographs, inclined pantographs or, particularly in the case of trolley buses, using pantographs with contact shoes. Metro systems commonly use the so-called third rail as their power supply. Power supply provided by rigid conductors preceded power supply using flexible power supply lines. Metal pipes with a ca. 20-25 cm diameter, with a slit provided at their bottom, were one of the early forms of overhead power supply systems. The moving vehicle pulled a core moving inside the pipes, to which the vehicle was connected via a flexible cable. A two-pole power supply system provided by two parallel pipes was usually used. The pipes were attached to carrier ropes. The system was developed by Siemens and presented for the first time during the International Exposition of Electricity in Paris, in 1881. Rigid conductors were used for the first time within a national railway network in the city centre line Baltimore Belt Line of Baltimore & Ohio Railroad (USA) and was used for a short period of time following electrification in 1895. A Z-shaped metal profile was used as the traction cable, and the engines were provided with special receivers (followed by introduction of the so-called “third rail”). Power supply provided from the overhead lines had to be rather complicated initially, e.g. the system by Charles J. Van Depoele, in which electricity was collected using a trolley encompassing the line with its side rollers (American patent publication U.S. Pat. No. 336,453). Despite the fact that such receivers were quickly replaced by newer and more effective designs, they were the origin of one of two American names for tramways—the trolley.
Power supply from overhead lines became much more simple after the discovery of a trolley pole (Frank J. Sprague, used within the tramway line Franklin Street Railway in Richmond, 1888) and a contact pole, e.g. an inclined pole (Bügelstromabnehmer, Werner von Siemens, ca. 1890). A pole with a contact did not have to look like a lyre, it could also be rectangular (e.g. used within the Stockholm-Djursholm line, in three-phase lines—a design with additional frames, they were also used until recently in tramways in Rome). The trolley pole and the contact pole technology were related through a common idea—the contact between the pole and the driving line was to be realized thanks to the flexible design of the pole itself. As we have already mentioned, however, both technologies required different types of overhead lines. The invention of a pantograph, dating back to the early 20th century, seemingly had no significant influence on the shape of the overhead lines adapted to contact poles.
Before it was used within trolleybus lines, the two-pole power supply (two overhead lines) was used in some tramway networks, if the city did not approve power supply rails for the purpose, e.g. In Tokyo, Cincinnati, Havana (two-pole power supply systems). One of the variants included power supply without the so-called “zero” line, e.g. used in the Tábor-Bechyně railway line in Czechia (Frantšek Křižík): with one line operating at +700 V, the other at −700 V.
Demand for new pantograph carriages intended for smooth transfer of electricity from a flexible cable to an electric receiver, which could be used in contact-type power supply systems for vehicles, such as tramways, railway engines, trolleybuses, metro vehicles, suspended and line transport carriages still exists in the field, also in field conditions and in temporary use scenarios.
Thus, the objective of this invention was to develop a design of a pantograph carriage intended for mobile, continuous transfer of electricity from a flexible cable to an electric receiver.
Thus, the objective of the invention is a pantograph carriage for collection of electricity from a flexible cable, containing at least two conductor wires, partially moulded into a flexible screen, which forms flexible lips in the uncovered part of conductor wires, wherein the carriage is provided with a load bearing element equipped with at least two load bearing rollers, with at least one roller rolling across the top surface of the flexible cable, characterised in that it contains at least two sliding drivers, which in their working position enter spaces between the flexible lips of the cable and touch the conductor wires with their sliding surfaces, wherein at least one opening element is provided in order to open the flexible lips of the cable in order to form a space, where the sliding drivers enter.
The opening element is preferably formed as a plate with a blade, with an edge parallel to the longitudinal axis of the cable, which with the blade inserted between the flexible cable lips is turned around an axis perpendicular to the plate blade edge, forming space into which the sliding drivers may enter.
The opening element is preferably a wedge, which inserted between the flexible cable lips forms a space, into which the sliding drivers may be inserted.
The opening element is preferably a rotary disc rotating around an axis perpendicular to the plane passing through longitudinal axes of conductor wires, such that blades of the rotary disc enter between the flexible cable lips, forming space for sliding drivers present on the rotary disc, on the side of the blade opposite to the rotation axis of the rotary disc, and the sliding drivers contact the conductor wires.
There are preferably at least two opening elements for the conductor wire, separated at a certain distance along the flexible cable.
Scissor arms with load bearing rollers are preferably attached to the load bearing element.
The load bearing element preferably includes a straight bar with its longitudinal axis perpendicular to the longitudinal axis of the flexible cable and parallel to a plane passing through longitudinal axes of conductor wires, wherein two symmetrically movable load bearing roller supports are moving along its longitudinal axis and are placed such that load bearing rollers are placed at the ends of the supports, such that roller surfaces touch the top surface of the flexible cable once the supports are fully moved in, and when moved out, the entire carriage may be moved downwards.
The load bearing element preferably includes a rigid frame with a U-shape in the cross-section towards the longitudinal axis of the flexible cable, wherein bars comprising axes of load bearing rollers are attached as rotary elements at the ends of the rigid frame arms, rotating around axes parallel to the longitudinal axis of the flexible cable, wherein in the vertical position of these bars with load bearing elements it is possible to move the entire carriage downwards, and after bar rotation together with the load bearing rollers towards the flexible cable, load bearing roller surfaces touch the top surface of the flexible cable.
The load bearing element preferably includes a divided and separable frame with a fixed part and a movable bar, wherein axes with load bearing rollers are provided at free ends of arms of both parts, such that once the bar is moved outwards from the frame, the entire carriage may be moved down and when pressed together, the load bearing roller surfaces touch the top surface of the flexible cable.
The load bearing roller may be preferably driven rollers or idle rollers.
The carriage is preferably suspended on four symmetric sets of driven load bearing rollers and idle load bearing rollers, with two rollers opposite one another, on both sides of the flexible cable, wherein distances between the terminal and neighbouring sets are at least twice as small as between the inner sets.
The carriage is preferably suspended on the top load bearing rollers pressed against the flexible cable by the bottom pressing rollers, wherein the bottom pressing rollers may be driven rollers or idle rollers.
The load bearing roller is preferably a toothed wheel used to transfer power from the carriage to the flexible cable using tracks tensioned between toothed wheels, wherein the tracks move symmetrically along the longitudinal axis of the flexible cable, along the surface of the flexible cable.
The drive of the pantograph carriage is preferably realized using toothed wheel meshing with the toothed strip integrated into the special, flexible cable and placed on its surface.
The pantograph carriage for collection of electricity from a flexible cable is presented in embodiments in the figures, where:
| Number | Date | Country | Kind |
|---|---|---|---|
| PL432151 | Dec 2019 | PL | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2020/061630 | 12/8/2020 | WO |
