Automatically closing barrier comprises barrier arm, rotary arm, lock and compensatory weight and involves manual opening operation independent of other systems, but no manual operation being required for closing

摘要

Automatically closing barrier (10) comprises a barrier arm, rotary arm, lock (7) and compensatory weight. It involves a manual opening operation independent of other systems, but no manual operation is required for closing. The completely automatic movement process is ensured by the displacement of a fluid. The speed of closure can be adjusted.