Coil hair tie

Abstract

A coil hair tie include: a spiral coil body configured as a head-to-tail connected ring with a hollow portion for allowing hair to pass through, wherein the spiral coil body has a hollow chamber therein; and a linear elastic restoring member comprising at least one one-dimensional elastic body extending in a direction substantially parallel to the spiral coil body and disposed in the hollow chamber of the spiral coil body, and being head-to-tail connected to form a ring configuration. When the spiral coil body is stretched into a tensile configuration with a lower coil density, the elastic restoring member is also stretched, and when the tensile force applied to the spiral coil body is removed, the spiral coil body restores to a retracted configuration having a higher coil density through the tensile restoring force of the elastic restoring member.

What is claimed is: 
     
         1 . A coil hair tie, comprising:
 a spiral coil body configured as a head-to-tail connected ring, which encloses a hollow portion for allowing hair to pass through, wherein the spiral coil body has a hollow chamber thereinside; and   a linear elastic restoring member comprising at least one one-dimensional elastic body extending along the head-to-tail connected ring of the spiral coil body and disposed in the hollow chamber of the spiral coil body, and being head-to-tail connected to form a ring configuration,   wherein when a tensile force is applied to stretch the spiral coil body into a tensile configuration with a lower coil density, the elastic restoring member is also stretched, and when the tensile force applied to the spiral coil body is removed, the spiral coil body restores to a retracted configuration having a higher coil density through the tensile restoring force of the elastic restoring member.   
     
     
         2 . The coil hair tie according to  claim 1 , wherein the linear elastic restoring member comprises two one-dimensional elastic bodies extending substantially in parallel and respectively head-to-tail connected to form the ring configuration. 
     
     
         3 . The coil hair tie according to  claim 2 , wherein the materials and/or sizes of the two one-dimensional elastic bodies are different. 
     
     
         4 . The coil hair tie according to  claim 1 , wherein the linear elastic restoring member comprises two one-dimensional elastic bodies interweaved with each other and head-to-tail connected to form the ring configuration. 
     
     
         5 . The coil hair tie according to  claim 1 , wherein the at least one one-dimensional elastic body is wrapped with a protective material, which is different from the material of the one-dimensional elastic body. 
     
     
         6 . The coil hair tie according to  claim 5 , wherein the protective material has a lower stretchability than the one-dimensional elastic body for confining a stretch range of the one-dimensional elastic body. 
     
     
         7 . The coil hair tie according to  claim 1 , wherein the coil hair tie is integrally formed of a thermoplastic polyurethane or thermoplastic rubber.