| 摘要 |
PURPOSE: An automatic closer for a fire door is provided to facilitate the electrical connection of a fire detector. CONSTITUTION: An automatic closer for a fire door comprises an apparatus body(101), an arm bar(110), an opening maintenance unit, and a releasing unit. The arm bar comprises a connection plate(111), a connection wheel, a working wheel, a wheel accommodation space, a tooth projection, and a position determining groove. The wheel accommodation space is formed in the lower portion of the working wheel. The opening position of a door is determined following the plurality of tooth projection. The position determining groove is formed in on side of the working wheel. |
