BRAIDED SAFETY-RESCUE CORD Russian patent published in 2010 - IPC D07B1/00 

FIELD: textile, paper.

SUBSTANCE: safety-rescue braided cord comprises a bearing core, made of bundle of rectilinearly arranged threads, located inside protective shell arranged in the form of thread-like body of tubular shape, formed by braiding of even number of braiding threads separated into two equal parts, in every of which threads are arranged along spirals of the right and left directions. Between core and protective shell, cord additionally comprises a buffer layer formed by at least two wrapping threads arranged around bearing core along spirals of one direction. At the same time pitch of buffer layer spirals is determined by formula t_s=375/D₀m₀, where t_s - pitch of spirals, mm; D₀ - density of protective shell braiding threads, n/cm; m₀ - number of wrapping threads forming buffer layer, besides bending stiffness of cord does not exceed 55 gs·cm.

EFFECT: low bending stiffness of cord.

1 tbl, 2 dwg