Stringing apparatus for pilot lines
First Claim
1. An apparatus for stringing a pilot line or phase line within the frame of a power line tower of H-frame, portal or corset type, utilizing a helicopter for drawing the pilot line and wherein the stringing apparatus is suspended by a strap from the helicopter and the pilot line is fastened to said apparatus, comprising a basic element that includes a forward, vertical member, with the strap fastened to the upper end thereof, and a lower, rearwardly extending horizontal member, a horizontal, rearwardly extending upper arm pivotally connected at one end to the upper end of the vertical member to permit the arm to pivot freely upwardly from the horizontal position following its release and having a downwardly open notch terminating in a recessed groove at the free end thereof, a horizontal, rearwardly extending lower arm pivotally connected at one end to the rear end of the horizontal member and having an upwardly open transverse groove at the free end thereof, means for pivoting the lower arm between a horizontal position and a vertical position wherein its groove is brought into alignment with the groove in the upper arm, a bolt fastened to the end of the pilot line, said bolt being initially retained in the groove of the upper arm, and a catch mechanism for holding the upper arm in its horizontal position until the lower arm is brought up into its vertical position whereby the bolt is transferred to the groove in the lower arm and the upper arm is released from the catch mechanism to pivot upwardly.
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Accused Products
Abstract
A stringing apparatus for stringing a pilot line, optionally a phase line, within the frame of a power line tower of H-frame, portal or corset type, using a helicopter for drawing the pilot line, wherein the stringing apparatus is suspended from the helicopter by a strap and the pilot line is fastened to said apparatus.
The stringing apparatus comprises a frame with two arms which alternately retain the pilot line. By pivoting the arms, the frame can be opened and closed in two directions, toward the rear and at the top, permitting the frame as it is drawn past a cross member of the power line tower to guide the pilot line from the top side to the underside of the cross member, where the line rests in a block suspended from the cross member.
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Citations
11 Claims
- 1. An apparatus for stringing a pilot line or phase line within the frame of a power line tower of H-frame, portal or corset type, utilizing a helicopter for drawing the pilot line and wherein the stringing apparatus is suspended by a strap from the helicopter and the pilot line is fastened to said apparatus, comprising a basic element that includes a forward, vertical member, with the strap fastened to the upper end thereof, and a lower, rearwardly extending horizontal member, a horizontal, rearwardly extending upper arm pivotally connected at one end to the upper end of the vertical member to permit the arm to pivot freely upwardly from the horizontal position following its release and having a downwardly open notch terminating in a recessed groove at the free end thereof, a horizontal, rearwardly extending lower arm pivotally connected at one end to the rear end of the horizontal member and having an upwardly open transverse groove at the free end thereof, means for pivoting the lower arm between a horizontal position and a vertical position wherein its groove is brought into alignment with the groove in the upper arm, a bolt fastened to the end of the pilot line, said bolt being initially retained in the groove of the upper arm, and a catch mechanism for holding the upper arm in its horizontal position until the lower arm is brought up into its vertical position whereby the bolt is transferred to the groove in the lower arm and the upper arm is released from the catch mechanism to pivot upwardly.
Specification