| 摘要 |
A device for releasably holding flexible sheet material, comprising a holding member having a longitudinal slot with an entrance opening to the slot extending along the length of the slot, a first elongate locking member inserted through the entrance opening into the slot, and a second elongate locking member inserted through the entrance opening, after the first locking member, into the slot, the second locking member having a thickness greater than the entrance opening and being inserted through the opening by force, the device being such that the flexible sheet material extends around the first locking member and has two layers of material unsecured to each other and extending past the second locking member and out through the entrance opening adjacent a first wall of the slot, and the second locking member, when in its effective locking position in the slot, is in contact with the first locking member through one of the layers and situated between the two layers of the flexible material on one side and a second wall of the slot on the other side of the second locking member, which second wall is defined by a surface of a slightly resilient overhang integrally formed with the holding member, whereby tension applied to the layer nearest the first wall tends to lock the sheet more firmly in the slot and tension applied to the other of the layers tends to release the material from the slot. |
