DOUBLE V STRINGING BLOCK
The present disclosure provides a stringing block. The stringing block may include a sheave with a circumferential groove with a pair of opposed walls. The opposed walls may extend away from the base of the groove to a flair point at a first angle. The opposed walls may extend away from the flair point to a rim at a second angle that is less than the first angle.
1 . a circumferential groove, the circumferential groove including a pair of opposed wall surfaces that converge at a base surface, where each of the opposed wall surfaces extends outwardly from the base surface to a flair point at an angle of approximately 45 degrees with respect to a vertical line bisecting the center of the base surface, and where each of the opposed wall surfaces extends outwardly from the flair point at an angle of approximately 16 degrees with respect to the vertical line to a rim.
2 . The sheave of claim 1 , where the base surface comprises a groove radius of approximately 0.375 inches.
3 . The sheave of claim 1 , where the circumferential groove is configured to hold a twisted pair of electrical conductors at an approximately 0 degree orientation and at an approximately 90 degree orientation.
4 . The sheave of claim 3 , where the center of gravity of the portion of the twisted pair of electrical conductors held in the circumferential groove remains in approximately the same location in the approximately 0 degree and approximately 90 degree orientations.
5 . The sheave of claim 1 , where the circumferential groove is configured such that a twisted pair of electrical conductors held in the circumferential groove can rotate up to 360 degrees.
6 . The sheave of claim 1 , further comprising rim edges on the pair of opposed wall surfaces, where the rim edges extend away from the vertical line bisecting the center of the base surface.
7 . The sheave of claim 1 , where the sheave is circular.
8 . The sheave of claim 1 , where the sheave is not circular.
9 . The sheave of claim 1 , where the circumferential groove is integrally formed in the sheave.
10 . The sheave of claim 1 , where the circumferential groove is not integrally formed in the sheave.
11 . The sheave of claim 10 , where the circumferential groove includes urethane material attached to a portion of the sheave.
12 . The sheave of claim 1 , where the circumferential groove is configured to hold a twisted pair of electrical conductors where the individual electrical conductors have outside diameters of approximately 1.165 inches.
13 . The sheave of claim 1 , where the base surface comprises a groove radius that is less than 1.1 times a radius of an electrical conductor that the circumferential groove is configured to hold.
14 . The sheave of claim 1 , where a depth of the circumferential groove is 25 percent larger than a diameter of an electrical conductor that the circumferential groove is configured to hold.
15 . The sheave of claim 1 , where a centroid of an electrical conductor within the circumferential groove moves more in a horizontal direction than in a vertical direction when the orientation of the electrical conductor changes from 90 degrees to 180 degrees.
16 . The sheave of claim 1 , where the flair point is located at an approximate midpoint of the opposed wall surfaces.
17 . The sheave of claim 1 , further comprising a central hub and a plurality of spokes, where the plurality of spokes attach the circumferential groove to the central hub.
18 . The sheave of claim 17 , further comprising a plurality of ribs, where the plurality of ribs extend away from the base surface in a direction opposite the pair of opposed wall surfaces.
19 . A sheave comprising:
a groove extending along an outer circumference of the sheave, the groove including a first wall surface and an opposing second wall surface;
the first wall surface having a first bottom portion and a first top portion converging at a first transition point; and
the second wall surface having a second bottom portion and a second top portion converging at a second transition point,
where the first bottom portion is oriented at an angle of approximately 90 degrees with respect to the second bottom portion, and
where the first top portion is oriented at an angle of approximately 32 degrees with respect to the second top portion.
20 . A stringing block assembly comprising:
a frame; and
a sheave rotatably mounted in the frame, where the sheave comprises:
a circumferential groove, the circumferential groove including a pair of opposed wall surfaces that converge at a base surface, where each of the opposed wall surfaces extends outwardly from the base surface to a flair point at an angle of approximately 45 degrees with respect to a vertical line bisecting the center of the base surface, and where each of the opposed wall surfaces extends outwardly from the flair point at an angle of approximately 16 degrees with respect to the vertical line to a rim.