| 摘要 |
A two portion frame for an opening (10) comprises a fixed frame portion (12), which is secured about the opening (10); a removable frame portion (22), which is hinged to the fixed frame portion (12) by hinges (30) and locks (36) by which the removable frame portion (22) is fixable to the fixed portion (12), so that the removable frame portion is removable only from one side of the frame. A door (32) is hinged to the removable frame portion (22) by hinges (34) so that it opens towards the other side. One or more locks are provided to lock the door (32) with the removable frame portion (22) and one or more locks are provided to lock the removable frame portion (22) with the fixed frame portion (12). |
