Ring band adjustment structure of crash helmet

摘要: A ring band adjustment structure of a crash helmet comprises band, connection sheet, locating bar, and pair adjusters. Two ends the are connected to The adjusters bar so that can move along guide track formed at edge bar. By pressing press element on adjuster, point-shaped unidirectional bottom face adjuster will leave from corresponding strip-shaped move. Each end has limit not slide out. Thereby, diameter be adjusted, is simplifier, manufacture assembly easier, hence facilitating modular processing.