Offset detecting device for trolley-assisted vehicles
AssigneesToyo Denki Seizo Kabushiki Kaisha, Komatsu Ltd.
InventorsHidetoshi Takei, Takumi Nozaka, Teruo Minami
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Abstract
Offset condition detecting device for detecting offset condition of pantographs from overhead contact wires by means of electric current detected by a contact element mounted on the pantograph and insulated therefrom. The detection is made electrically and in case of emergency the pantographs are lowered down at high speed to prevent damage of pantographs of trolley-assisted vehicles.
Claims4
Offset condition detecting device of pantograph for trolley-assisted vehicles powered by an engine driven generator in non-trolley mode, and operated by outer power supply collected by a pair of vehicle mounted pantographs from two-line contact wires of an overhead system in trolley mode,
- the improvement comprising a contact element for detecting offset condition of the pantograph from the contact wire, the contact element being mounted on the pantograph in an electrically insulated manner from collector sliding plate,
- a current limiting impedance element connected in a circuit between the collector sliding plate of one pantograph of a pair and the offset condition detecting element on the other pantograph, and
- current detecting means for detecting electric current flowing through said current limiting impedance element,
- wherein the pair of pantographs are retracted down at emergency base when the detected current flowing through said impedance element exceeds a predetermined value.
Dependencies are inferred from the claim text.