Apparatus and method of threading a closed framed opening by helicopters
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United States of America Patent
Stats
-
Jul 14, 1981
Grant Date -
N/A
app pub date -
Nov 29, 1979
filing date -
Nov 29, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method of automatically threading successive closed framed openings by helicopter towing a line equipped with a separable coupling. The invention utilizes a short cable loop pre-threaded through each closed frame such as the throat of a stringing block which cable loop is provided at its ends with coupling halves releasably supported at the opposite ends of a trough overlying the framed opening to be threaded. A helicopter is manoeuvred to drop the towing line coupling into a trough where its halves are automatically separated and thereafter recoupled to a respective end of the cable loop. Subsequently, the forward coupling can be similarly separated for insertion of a second cable loop in the towing line at the next threading apparatus in the helicopter's path of travel.
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Cited Art Landscape
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