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Transportation system of a floated-carrier type
| Details |
Inventors: Morishita, Mimpei; Azukizawa, Teruo;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Marbert; James B.
Assistant Examiner: Pape; Joseph D.
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
A transportation system of a floated-carrier type according to this invention includes a carrier capable of running along guide rails with a cargo and load carried thereon. A magnetic unit is mounted on the carrier to float the carrier from the guide rails. A slowing-down device is provided to slow down the carrier when the carrier is just about to enter into a stop position. Projections of ferromagnetic material are provided on the side of predetermined portions of guide rails which the magnetic unit of the carrier confronts when the carrier is stopped in the stop position. The magnetic unit, together with the guide rails, establishes a magnetic circuit. The magnetic resistance in the magnetic circuit is smaller at the predetermined portions of the guide rails where the aforementioned projections are provided than at other portions of the guide rails. When, in this case, the carrier arrives substantially at the stop position, the magnetic flux due to the magnetic unit flows through the aforementioned magnetic circuit in an increasing amount, assuring an increased attractive force between the magnetic unit and the predetermined portions of the guide rails where the projections are provided. As a result, the carrier is attracted toward the location of these predetermined portions of the guide rails so that it is positioned precisely in the stop position. |
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DETAILED DESCRIPTION It is accordingly the object of this invention to provide a transportation system of a floated-carrier type which can stop a carrier exactly in a stop position through a simpler positioning means.
According to this invention, there is provided a transportation system of a floated-carrier type as set forth below.
Guide rails, which are formed of ferromagnetic material, extend in the longitudinal direction.
A carrier travels along the guide rails with cargo carried thereon.
A magnetic unit includes electromagnets so arranged as to confront the lower surface of the guide rail with an air gap left therebetween, and floats the carrier from the guide rail.
The transportation system further includes a device for running the carrier along the guide rails, and slowing it down when the carrier is just arriving at a stop position.
Projections of ferromagnetic material are provided on the side of predetermined portions of the guide rails which the magnetic unit of the carrier confronts when the carrier has been stopped at the stop position.
The magnetic unit, together with the guide rails, creates a magnetic circuit.
The magnetic resistance in the magnetic circuit is smaller at the predetermined portions of the guide rails where the projections are provided as set forth above than at other portions of the guide rails.
Accordingly, when the carrier arrives substantially at the stop position, the magnetic flux flows through the aforementioned magnetic circuit in an increasing amount.
When this is done, an increased attractive force due to the increased magnetic flux acts between the magnetic unit and the predetermined portions of the guide rails where the projections are provided.
As a result, the magnetic unit is attracted toward the predetermined portions of the guide rails, so that it is stopped exactly at the stop position through such simpler positioning means.
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Navigation and GPS 
