| 摘要 |
<p>A device for automatically opening and closing a door-like member allows a reverse input and can be easily mounted at low cost without making the device complex. The device for automatically opening and closing a door-like member comprises an extendible actuator (20) and a link mechanism (10). The actuator (20) comprises a drive section (30) including a motor (32), a reduction gear (33), and a ball screw (34), and also comprises an extendible arm section (40) including a ball nut (42) engaging with the ball screw (34). The link mechanism (10) can be either a four-point link comprising a pair of hinge arms (11, 12) and a pair of link plates (13, 14) or a single link (60) rotatably joined with the door-like member or a frame body and with an actuator (70). The magnitude of the pitch of the screw threads through which the ball screw (34) and the ball nut (42) engage with each other is selected so that a reverse input from the door-like member side to the drive section side of the actuator (20) is possible.</p> |
