BRAIDED SAFETY CORD OF THRESHOLD OPERATION Russian patent published in 2010 - IPC D03D1/00 

FIELD: textile, paper.

SUBSTANCE: braided safety cord of threshold operation is arranged by plain weaving of background warp and weft threads, and additionally comprises at least two ruptured power-consuming groups of warp threads evenly distributed along its width. Additional power-consuming groups of warp threads consist of even number of textile threads identical in raw material composition and linear density of textile threads, which are arranged in pairs, and are woven with each other oppositely, forming woven elements of repp weaving with repeat length from 2 to 8 wefts. Threshold of cord operation is determined by the following formula: P_ac=P₁[1+0.9(n-1)], where P_ac - threshold of actuation in kgf, P₁ - total rupture load of one group of threads of additional warp in kgf, n - total number of groups of power consuming systems of various weaving warp threads. Total rupture load of background warp threads at least 20 times exceeds value of cord threshold operation. Full repeat of cord along warp equals doubled product of repeats in all systems of various weaving warp threads it contains. Weft weaving repeat equals least total multiple of weft repeats of all power-consuming systems of warp threads contained in cord.

EFFECT: invention provides for an insignificant displacement of secured body in case of threshold operation.

1 cl, 2 dwg