Helicopter lineman's ladder

Details Helicopter lineman's ladder Helicopter lineman's ladder

2006-02-07

2006-02-07

Chin-Shue, Alvin (Department: 3634)

Fire escape, ladder, or scaffold

Suspended platform

C182S206000, C182S046000, C182S093000

Reexamination Certificate

active

06994186

ABSTRACT:
A rigid, unitary ladder is provided having one end configured to be attached to a powerline support tower after the ladder is dropped by helicopter to a lineman previously offloaded onto the tower. The ladder includes a first section which extends outwardly from the tower and a second section which extends at an angle at least equal to ninety degrees from an end of the first section to a base which is configured to rest on the powerline, the angle being defined between the undersides of the first and second ladder sections. The first section is of a length sufficient to space the base a distance from the tower which is beyond the flashover area around the tower.

REFERENCES:
patent: 166883 (1875-08-01), Miller
patent: 285471 (1883-09-01), Doane
patent: 694771 (1902-03-01), Monroe
patent: 901565 (1908-10-01), Thomson
patent: 1545348 (1925-07-01), Nalder
patent: 1942210 (1934-01-01), Walder
patent: 2760707 (1956-08-01), Anderson
patent: 2858055 (1958-10-01), De Long et al.
patent: 3402786 (1968-09-01), White et al.
patent: 3954156 (1976-05-01), Kennedy

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