Retractable pantograph for downward withdrawal in the event of an abnormal frontal load
AssigneeFaiveley S.A.
InventorAndre Milleville
Life of this patent
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Abstract
A movable structure for supporting a current-collector bow is pivotally mounted on a frame and lifted by means of a spring attached to the structure and to the frame. Upper members of the bow support structure permit displacement of the bow independently of the structure. Hook-engagement means or valve units are provided for neutralizing the lifting spring and transmission means are provided for connecting the bow-displacement means to the spring-neutralizing means. A load limiter inhibits the bow-displacement means below a predetermined load threshold value and releases the bow above this value.
Claims7
A retractable pantograph for automatic downward withdrawal in the event of an abnormal frontal load, comprising a frame, a lifting structure pivotably attached to the frame, a lifting spring connected to the lifting structure for urging a top region of the lifting structure away from the frame, means for connecting a current-collector bow to the top region of the lifting structure, said connecting means including means for permitting displacement of the bow independently of the movable structure, means for neutralizing the lifting spring, additional transmission means for coupling the bow-displacement means to said means for neutralizing the lifting spring, and a load limiter which inhibits the bow-displacement means at point below a predetermined threshold value of the load applied to the bow and which trips said bow with respect to said lifting structure above said threshold value.
Dependencies are inferred from the claim text.