| 摘要 |
<p>A frame member 5 e.g. of a garage door has a slot 6 open at one end of the member for receiving a screw to secure it to a like frame member. Inwardly directed protrusions 9 at the open end of the slot help to prevent the screw from sliding out of the slot when its head is abutted against the face of the frame member, but allows the screw to be lifted axially and then removed from the slot with the screws head passing over the protrusions. <IMAGE></p> |
