| 摘要 |
PROBLEM TO BE SOLVED: To provide a door closer that improves a crime prevention function by attaching the key to the door closer.SOLUTION: Components (1) and (2) are installed in a rod part of a door closer. A key (4) and a keyhole (5) are provided in a position where the components (1) and (2) overlap each other. The key is opened/closed by moving a knob (3) upward and downward. This opening/closing can also be operated by transmitting radio waves (also including infrared rays and the like) from a remote control (7) and receiving the radio waves by a receiver (6). |
