| 摘要 |
A collapsible member comprising a tensioning means (311, 313), resilient means (330) to be tensioned, said resilient means being of a first predetermined length and being engaged with the tensioning means, rigidifying means (320) being of a second collective predetermined length shorter than the first predetermined length located with said resilient means, and anchoring means (331) to anchor an end of the resilient means to be tensioned, wherein moving said tensioning means (311, 313) to a first position provides sufficient tension of the resilient means wherein the rigidifying means (320) and the resilient means (330) result in an overall length of said collapsible member substantially equal to the second collective predetermined length, wherein moving said tensioning means (311, 313) to a second position provides sufficient relief of tension of the resilient means (330) wherein the rigidifying means (320) is untensioned resulting in an overall length of said collapsible member substantially equal to the first predetermined length wherein in the tensioned position, the member cannot be manually bent or untensioned without moving said tensioning means to a second position. |
