SPIRAL DEAD-END CLAMP Russian patent published in 2006 - IPC H02G7/02 

FIELD: power engineering; attachment of bare conductors to supporting structures of overhead power transmission lines.

SUBSTANCE: proposed clamp is, essentially, spiral stranded conductor made of steel or aluminum wires stuck together. Inner surface of stranded conductor is covered with abrasive material to enhance conductor-to-clamp friction coefficient. Stranded conductor is looped in its middle part. This loop is fitted onto thimble and the latter is attached to supporting structure of overhead power transmission line. Density of abrasive coating applied to stranded conductor is such that variable friction coefficient is ensured throughout entire length of clamp relative to wire ranging between 0.1 and 0.8; coiling angle of spiral wires of strand 1 on conductor 4 throughout clamp length is also variable. As an alternative, abrasive is not applied on inner surface of clamp strand within section of definite length (up to five coiling pitches);coefficient of spiral wire compression relative to conductor 4 also varies in the course of manufacture within the range of 0.8 to ≥1. This clamp ensures design strength of conductor termination without impairing integrity of conductor, its contacting surface does not cause damage to external wires of stranded conductor.

EFFECT: enhanced reliability of securing bare conductors on line supporting structures.

2 cl, 3 dwg