Electricity: transmission to vehicles – Collectors – Trolley
Patent
1976-05-20
1978-09-12
Blix, Trygve M.
Electricity: transmission to vehicles
Collectors
Trolley
191 66, B60L 512
Patent
active
041130740
ABSTRACT:
An improved technique for regulating the contact pressure of a pantograph brush on an overhead guide conductor is described. The brush is supported for vertical movement in a brush support member for adjustable wiping contact with the overhead conductor. The brush support member is in turn supported for movement in a vertical plane via a two-arm scissors arrangement which is supportable on the roof of an electric vehicle. A high-frequency signal picked up by a transducer situated in the area of the brush and representative of the instantaneous contact pressure of the brush on the wire is compared with an adjustable reference indication indicative of a desired contact pressure, and the resulting difference signal is employed to incrementally adjust the brush contact pressure. In addition, a separate low-frequency indication derived from such difference signal when the amplitude of such signal exceeds a predetermined value is employed to independently position the scissor member in a vertical direction, thereby providing a coarse adjustment of the brush position during relatively large-amplitude changes of the guide wire height.
REFERENCES:
patent: 3349197 (1967-10-01), Scheidecker
Holtmeier Gerhard
Stemmann Karl
August Stemmann OHG
Blix Trygve M.
Eisenzopf Reinhard J.
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