| 摘要 |
PURPOSE: An apparatus for preventing an entrance door from being rapidly opened and closed is provided to prevent noise occurred when an entrance door is quickly closed. CONSTITUTION: An apparatus(1) for preventing an entrance door from being rapidly opened and closed comprises a guide unit(10) and an operation unit(20). The guide unit has a guide plate(11) and a corrugated guide hole(12). The operation unit has a reference plate(21) and an operation plate(25). A reference pin(22) is protruded from the top center of the reference plate. A guide pin(27) is protruded from the top of the operation plate. A hole(26) is formed in one longitudinal side of the operation plate. The operation unit allows the operation plate to be rotated around the reference pin. |
