| 摘要 |
The split-shaped opening (D) has a length which vary of approximately one quarter of the total length of the cover sheet to a length equal to the total length of the cover sheet. Along the edge of the split-shaped opening a device is fitted, with which a reinforcement in the form of preferably a pole, bar, pipe or plate material can be fixed or retained. The end of the reinforcement located in the vicinity of the end of the split has an engagement point. The pole is held in position by a doubling applied or inserted in the form of a completely tightly applied edge or comparable fixture. The edge is open on the under side, i.e. the side (C) of the cover sheet, through which a pole can be duly inserted to an engagement point during fitting or removal of the cover sheet. |
