Grounding device for multi-conductor stringing blocks

Claim 2

In a bundle stringing block having a supporting frame, a plurality of coaxial sheaves for respectively supporting one of a plurality of conductors and a laterally centrally disposed pulling line, and laterally extending shaft means rotatably supporting said sheaves on said frame; a grounding device comprising a pair of roller arms rotatably supported by said frame laterally outwardly of said sheaves, a metal grounding roller centrally aligned radially with each of said sheaves, a roller shaft extending laterally of said rollers and supported by said arms for swinging movements peripherally of said sheaves, resilient means interconnecting said frame and each of said arms to impose a predetermined lifting force on the latter, and eccentric bearing means interposed between said roller shaft and at least two of said conductor sheave grounding rollers for eccentrically mounting each of said rollers relative to each other and relative to the axis of said roller shaft, whereby said rollers are maintained in electrical contact with their associated conductor or pulling line during a stringing operation regardless of variations in tension and resulting angle of tangency with said sheaves individual to said pulling line and said conductors.

Claim 3

A grounding device according to claim 1, wherein said eccentric bearing means comprises a sleeve having a bore mounted on said roller shaft and a cylindrical portion eccentric to the axis of said bore rotatably supporting a said roller.

Claim 4

A grounding device according to claim 1, wherein said eccentric bearing means comprises a sleeve having a bore mounted on said roller shaft and two diametrically opposed and laterally spaced cylindrical portions eccentric to the axis of said bore and respectively rotatable supporting a said roller.

Claim 5

A grounding device for a bundle block having a frame, a plurality of coaxial sheaves for respectively supporting one of a plurality of conductors and a pulling line during a stringing operation, and laterally extending shaft means rotatably supporting said sheaves on said frame; comprising arm means pivotally supported on said frame, a roller shaft supported by said arm means for swinging movements peripherally of said sheaves, resilient means interconnecting said frame and said arm means to impose a predetermined lifting force on the latter, a metal grounding roller rotatably supported by said roller shaft in centrally aligned radial relationship with each said sheave, and means for insuring electrical contact being maintained between each of said rollers and its associated said conductor or pulling line during a stringing operation regardless of variations in tension and resulting angle of tangency with said sheaves individual to said pulling line and said conductors, comprising articulated interconnections between said roller shaft and said arm means, and eccentric bearing means interposed between said roller shaft and at least two of said conductor sheave grounding rollers for eccentrically mounting each of said rollers relative to each other and relative to the axis of said roller shaft.

Claim 6

A grounding device for a bundle block having a frame, a plurality of coaxial sheaves for respectively supporting one of a plurality of conductors and a pulling line during a stringing operation, and laterally extending shaft means rotatably supporting said sheaves on said frame; comprising arm means pivotally supported on said frame, a roller shaft supported by said arm means for swinging movements peripherally of said sheaves, resilient means interconnecting said frame and said arm means to impose a predetermined lifting force on the latter, a metal grounding roller rotatably supported by said roller shaft in centrally aligned radial relationship with each said sheave, and means for insuring electrical contact being maintained between each of said rollers and its associated said conductor or pulling line during a stringing operation regardless of variations in tension and resulting angle of tangency with said sheaves individual to said pulling line and said conductors, comprising articulated interconnections between said roller shaft and said arm means, and eccentric bearing means interposed between said roller shaft and at least two of said conductor sheave grounding rollers for eccentrically mounting each of said rollers relative to each other and relative to the axis of said roller shaft.

Claim 7

A grounding device according to claim 4, wherein said sheaves include a pulling line sheave and two conductor sheaves on the same side of said pulling line sheave, and said eccentric bearing means comprises a sleeve having a bore mounted on said roller shaft and two diametrically opposed and laterally spaced cylindrical portions eccentric to The axis of said bore and respectively rotatably supporting one of said two conductor sheaves.