| 摘要 |
The support structure 10,40 has first and second frame members 12,14 and a pair of bow strings 16,18 hingedly connected to the frame members at a pair of first and second spaced apart points 20, wherein the bow strings overlap one another at a point between the first pair of spaced apart points. Two pairs of bow strings may be used. The frame members may be biased by the springs in a first configuration in which they are spaced apart, but can be moved to a second configuration in which they are closer together. A releasable retainer or hook catch 34 can hold the frame members in the second configuration. The frame members may comprise a loop, plate or a hoop of metal wire. The support structure may include foldable plates, frames or boards that are sprung and hingedly connected to form end walls 32 of the support structure. |
