opening/closing device; mechanical opener/closer
Refers to a mechanical device that opens and closes something, such as shutters, gates, or windows. Often used in technical or product contexts.
このシャッターには自動開閉機が付いています。
This shutter is equipped with an automatic opening/closing device.
窓の開閉機が故障して動かない。
The window opener/closer is broken and won't move.
railway crossing gate; barrier
Rare term for a railway crossing gate. The more common word is 遮断機 (しゃだんき).
See also: 遮断機
古い資料では踏切の開閉機という表現が見られる。
In old documents, the term 開閉機 can be found referring to a railway crossing gate.
Compound of 開閉 (opening and closing) + 機 (machine, device). The exact historical derivation is uncertain, but the word follows a common pattern for naming mechanical devices.