| 摘要 |
<p>This invention relates to an emergency opening device for a swinging folding door or a swinging folding gate, using an electric motor drive with a switchable electromagnetic coupling for closing and opening the door panels. The invention teaches that the door has an emergency opening device, whereby the emergency opening device consists of elastic tension or compression means to which a pre-load can be applied during the closing of the door, which tension or compression means are engaged in the drive shaft of the outer panel or in the vicinity of the main closing edge of the inner panel.</p> |
