| 摘要 |
PURPOSE: A chain type bolt is provided to prevent a door from being easily opened in an outside by forming an end part of an insertion loop or an insertion groove in a square shape in order to prevent separation of the insertion loop. CONSTITUTION: A chain type bolt(1) comprises a male holding unit(20), an insertion loop(40), and a female holding unit(10). The insertion loop connected to the male holding unit by a chain(30) is inserted to an insertion groove of the female holding unit. The insertion loop comprises a first narrow unit(44) and a second narrow unit(45). The female holding unit comprises a first insertion groove(11) in a square shape and a first guide unit(12). |
