PH22017000061Y1 - Fastening lace comprising tubular lace body - Google Patents

Abstract

Laces having bulges according to prior art always have a core of elastic rubber, but they differ in the state of expansion and contraction of the portions of the rubber corresponding to the two end portions and the central portion of the bulge. In other words, even with the same elastic core, a portion that drastically expands and contracts coexists with a portion that does not expand and contract at all, and high strain accumulates at the boundary region between them, and when the strain reaches a limit, it ultimately ruptures. A problem with this art is that an operation by which strain accumulates in a relatively weak material like rubber is an essential operation. Proposed is a fastening lace comprising a tubular lace body made from an elastic material having bulges disposed repeatedly at intervals, the bulges changing in diameter according to a magnitude of axial-direction tension applied thereto, in which, of a central tube portion constituted of the tubular structure of the lace body, portions corresponding to a central portion of the bulges have a spherical shape.