Abstract: Apparatus and method for stringing aerial cables through tower structures using aircraft without requirement that a person be present on the tower while the aircraft is performing the stringing operation are described. An elongated needle-like threading member to which a sock line is attached and having spaced-apart projections emanating therefrom at different directions around the threading member, is directed by the aircraft pilot through a block having a pulley suspended by an insulator or other tower structure, the projections in cooperation with the block preventing the threading member from being pulled rearwardly under tension from the sock line. A device adapted for grabbing and releasing the threading member and attached to an aircraft haul line, permits the threading member to be hauled forward through the block once the aircraft flies to the other side of the tower and reattaches the grabbing device to the threading member.

Abstract: Apparatus and method for stringing aerial cables through tower structures using aircraft without requirement that a person be present on the tower while the aircraft is performing the stringing operation are described. An elongated needle-like threading member to which a sock line is attached and having spaced-apart projections emanating therefrom at different directions around the threading member, is directed by the aircraft pilot through a block having a pulley suspended by an insulator or other tower structure, the projections in cooperation with the block preventing the threading member from being pulled rearwardly under tension from the sock line. A device adapted for grabbing and releasing the threading member and attached to an aircraft haul line, permits the threading member to be hauled forward through the block once the aircraft flies to the other side of the tower and reattaches the grabbing device to the threading member.

Abstract: Apparatus and method for stringing aerial cables through tower structures using aircraft without requirement that a person be present on the tower while the aircraft is performing the stringing operation are described. An elongated needle-like threading member to which a sock line is attached and having spaced-apart projections emanating therefrom at different directions around the threading member, is directed by the aircraft pilot through a block having a pulley suspended an insulator of other tower structure, the projections in cooperation with a frame member attached to the block and facing toward the incoming threading member, preventing threading member from being pulled rearwardly under tension from the sock line.

Abstract: Apparatus and method for stringing aerial cables through tower structures using aircraft without requirement that a person be present on the tower while the aircraft is performing the stringing operation are described. An elongated needle-like threading member to which a sock line is attached and having spaced-apart projections emanating therefrom at different directions around the threading member, is directed by the aircraft pilot through a block having a pulley suspended an insulator of other tower structure, the projections in cooperation with a frame member attached to the block and facing toward the incoming threading member, preventing threading member from being pulled rearwardly under tension from the sock line.