Fire escape – ladder – or scaffold – Platform with elevating or lowering means – Suspended
Patent
1982-09-30
1984-10-23
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Platform with elevating or lowering means
Suspended
182150, E04G 310
Patent
active
044783124
ABSTRACT:
A portable cage and system for servicing high voltage power transmission lines, including a uniquely shaped cage lowerable onto a power line bundle of one or more conductors, the cage placeable by an ungrounded helicopter or a ground-based crane from a position above the power transmission lines lowered thereonto. Workmen may then safely move about within each basket to complete the required power line repair. The cage includes a horizontal crossframe and two baskets each connected to and downwardly hung from the crossframe, the entire cage having a unique, generally inverted "U"-shape when viewed from either end of the cage. The cage may include adjustable connector engagement wheels which contact each power line in the bundle for support and lateral movement of the cage. These wheels are connected to the crossframe such that the two basket portions of the cage hang on either side of the power line bundle, again aided by the generally inverted "U"cross-sectional shape. When wheels are included as part of the cage, brake and propulsion means are also included as part of the cage. When the cage is made movable on the power lines by the addition of wheels, a means for traversing the cage over hardware attached to the power lines may also be made a part of the cage. While supported on the power line bundle, the entire cage becomes energized to the same voltage potential as that of the power line bundle.
REFERENCES:
patent: 422345 (1890-02-01), Harman
patent: 836995 (1906-11-01), Schroeder
patent: 844641 (1907-02-01), Yeakel et al.
patent: 900713 (1908-10-01), Dye
patent: 3176795 (1965-04-01), Taylor
patent: 3702124 (1972-11-01), Highland
patent: 4163480 (1979-08-01), Highland
patent: 4243118 (1981-01-01), Landry
Chin-Shue Alvin
Machado Reinaldo P.
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