Pantograph emergency lowering system

Details Pantograph emergency lowering system Pantograph emergency lowering system

1976-08-04

1977-07-12

Blix, Trygve M.

Electricity: transmission to vehicles

Collectors

Trolley retrievers

191 85, 191 90, B60L 514

Patent

active

040348326

ABSTRACT:
An emergency lowering system for a vehicle mounted pantograph in which lever actuated trip valves are disposed at opposite ends of the pantograph current collector in a position to be actuated in the event that an overhead contact wire tends to slide off and end of the current collector. The trip valves control a relay air valve which is arranged to supply a relatively large volume of high pressure air to a pneumatic jack wherein the jack is connected to lower the pantograph. In a preferred embodiment the emergency lowering system is adapted to supply air at a higher pressure and larger volume than the normal lowering system whereby the pantograph is lowered at a faster rate in an emergency. For use in a train of vehicles the system includes a pressure responsive switch for detecting initiation of an emergency lowering condition and for providing a signal which can be used to effect lowering of all pantographs in the train if any one pantograph experiences an emergency condition.

REFERENCES:
patent: 946753 (1910-01-01), Case
patent: 3444338 (1969-05-01), Leger
Institute of Mechanical Engineers, pp. 27-29, Mar. 8, 1971, "Development of the Pantograph", D. J. W. Souch and G. Taylor.

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